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Organotin catalyst T12: New trends leading the future development of flexible electronic technology

2月 10th, 2025 News

Introduction

With the rapid development of technology, flexible electronic technology is gradually becoming an important development direction for future electronic equipment. Because of its unique flexibility, lightness and wearability, flexible electronic devices are widely used in smart wearable devices, medical and health monitoring, the Internet of Things (IoT) and other fields. However, to achieve high-performance flexible electronic devices, the selection of materials and preparation processes are crucial. Among them, catalysts play an indispensable role in the synthesis and processing of flexible electronic materials. As an efficient catalytic material, the organic tin catalyst T12 has shown great application potential in the field of flexible electronics in recent years.

Organotin catalyst T12, whose chemical name is Dibutyltin dilaurate, is a highly efficient catalyst widely used in polymer reactions. It has excellent catalytic activity, good thermal stability and low toxicity, which can significantly improve the reaction rate and improve material performance. T12 is not only widely used in the traditional plastics, rubber and coating industries, but also demonstrates unique advantages in the emerging field of flexible electronic materials. Its application in flexible electronic technology can not only improve the flexibility and conductivity of materials, but also effectively reduce production costs and promote the commercialization of flexible electronic technology.

This article will deeply explore the application prospects of the organotin catalyst T12 in flexible electronic technology, analyze its action mechanism in different flexible electronic materials, and combine new research results at home and abroad to look forward to the future development of flexible electronic technology. Important position. The article will be divided into the following parts: First, introduce the basic properties and parameters of T12; second, discuss the application examples of T12 in flexible electronic materials in detail; then analyze the comparative advantages of T12 and other catalysts; then summarize the flexible electronics Development trends in technology and propose future research directions.

Basic properties and parameters of organotin catalyst T12

Organotin catalyst T12, i.e., Dibutyltin dilaurate, is a commonly used organometallic compound and is widely used in various polymer reactions. In order to better understand the application of T12 in flexible electronic technology, it is necessary to discuss its basic properties and parameters in detail. The following are the main physical and chemical properties of T12 and its application parameters in flexible electronic materials.

1. Chemical structure and molecular formula

The chemical structural formula of T12 is [ (C4H9)2Sn(OOC-C11H23)2], and belongs to the organic tin compound family. Its molecules consist of two butyltin groups and two laurel ester groups. This structure imparts excellent catalytic properties to T12, especially in cross-linking reactions of polymers such as polyurethane (PU), polyvinyl chloride (PVC). The molecular weight of T12 is about 621.2 g/mol, a density of 1.08 g/cm³, a melting point of 50-55°C and a boiling point of about 300°C.

2. Physical properties

The physical properties of T12 are shown in Table 1:

Physical Properties Value
Molecular Weight 621.2 g/mol
Density 1.08 g/cm³
Melting point 50-55°C
Boiling point 300°C
Appearance Colorless to light yellow transparent liquid
Solution Insoluble in water, easy to soluble in organic solvents

The low melting point and high boiling point of T12 make it remain liquid at room temperature, making it easy to use in industrial production. Furthermore, T12 is insoluble in water, but is well dissolved in most organic solvents, which makes it have good dispersion and uniformity in polymer reactions.

3. Chemical Properties

The chemical properties of T12 are mainly reflected in its activity as a catalyst. As an organotin compound, T12 has strong Lewisiness and can effectively promote a variety of chemical reactions, especially addition and condensation reactions. The catalytic mechanism of T12 mainly coordinates the tin atom with functional groups in the reactants (such as hydroxyl groups, amino groups, carboxyl groups, etc.), thereby reducing the activation energy of the reaction and accelerating the reaction process. Specifically, the catalytic mechanism of T12 in the polyurethane reaction is as follows:

  1. Coordination: The tin atom in T12 coordinates with the isocyanate group (-NCO) to form an intermediate.
  2. Nucleophilic Attack: The tin atoms in the intermediate further react with hydroxyl (-OH) or other nucleophilic reagents to produce the final product.
  3. Catalytic Removal: After the reaction is completed, T12 is separated from the product, restores its catalytic activity, and continues to participate in the subsequent reaction.

4. Thermal Stability

T12 has good thermal stability and can maintain its catalytic activity at higher temperatures. Studies have shown that T12 can still maintain a high catalytic efficiency within the temperature range below 200°C, while T12 may decompose under high temperature environment above 300°C, resulting in a decrease in catalytic activity. Therefore, in the preparation of flexible electronic materials, it is usually necessary to control the reaction temperature between 150-200°C to ensure the optimal catalytic effect of T12.

5. Toxicity and environmental protection

Although T12 exhibits excellent catalytic properties in industrial applications, its toxicity issues have always attracted much attention. According to relevant regulations of the United States Environmental Protection Agency (EPA) and the European Chemicals Administration (ECHA), T12 is classified as a low-toxic substance, but it still needs to be appropriateWhen protecting, avoid long-term contact or inhalation. In recent years, researchers have developed a series of low-toxic, environmentally friendly organic tin catalysts by improving the synthesis process of T12, further reducing their potential risks to the environment and human health.

6. Application parameters

The application parameters of T12 in flexible electronic materials are shown in Table 2:

Application Parameters Value
Catalytic Dosage 0.1-1.0 wt%
Reaction temperature 150-200°C
Reaction time 1-6 hours
Best reaction pH value 7-8
Applicable Materials Polyurethane, polyvinyl chloride, epoxy resin, silicone rubber
Applicable Process Injection molding, extrusion molding, coating, spraying

It can be seen from Table 2 that the amount of T12 is usually between 0.1-1.0 wt%, and the specific amount depends on the material type and process requirements. The reaction temperature is generally controlled at 150-200°C, and the reaction time is 1-6 hours. The specific time depends on the type of reactants and the reaction conditions. T12 is suitable for a variety of flexible electronic materials, such as polyurethane, polyvinyl chloride, epoxy resin and silicone rubber, and is widely used in injection molding, extrusion molding, coating and spraying processes.

Example of application of T12 in flexible electronic materials

Organotin catalyst T12 is widely used and diverse in flexible electronic materials, especially in the preparation of materials such as polyurethane (PU), polyvinyl chloride (PVC), epoxy resin and silicone rubber. The following are specific application examples of T12 in different types of flexible electronic materials.

1. Polyurethane (PU) flexible electronic materials

Polyurethane (PU) is a polymer material with excellent flexibility and mechanical properties, and is widely used in the manufacturing of flexible electronic devices. As a highly efficient catalyst for polyurethane reaction, T12 can significantly improve the crosslinking density and mechanical properties of polyurethane while enhancing its electrical conductivity and thermal stability.

1.1 Improve the cross-linking density of polyurethane

In the synthesis of polyurethane, T12 forms a stable crosslinking structure by promoting the reaction between isocyanate groups (-NCO) and polyol (-OH). Studies have shown that adding an appropriate amount of T12 can significantly increase the crosslinking density of polyurethane, thereby enhancing the mechanical strength and durability of the material. For example, Wang et al. (2020) [1] found in a study that using 0.5 wt% T12 as a catalyst, the tensile strength of polyurethane is increased by 30% and the elongation of break is increased by 20%. This shows that T12 plays an important role in the polyurethane crosslinking reaction.

1.2 Improve the conductivity of polyurethane

In addition to improving crosslinking density, T12 can also improve the conductivity of polyurethane by introducing conductive fillers (such as carbon nanotubes, graphene, etc.). Research shows that T12 can promote the uniform dispersion of conductive fillers in the polyurethane matrix, thereby forming a continuous conductive network. For example, Li et al. (2021) [2] used T12 in combination with carbon nanotubes to prepare a flexible polyurethane film with good conductivity. The experimental results show that the conductivity of the film reached 10^-3 S/cm, which is much higher than the control sample without T12 added.

1.3 Improve the thermal stability of polyurethane

T12 can also improve the thermal stability of polyurethane and extend its service life. Studies have shown that T12 can form stable chemical bonds by coordinating with active groups in polyurethane, thereby inhibiting the degradation of the material at high temperatures. For example, Zhang et al. (2022) [3] found in a study that polyurethane materials using T12 as catalysts can maintain good mechanical properties at high temperatures of 200°C, while samples without T12 were added appeared. Significant softening and degradation.

2. Polyvinyl chloride (PVC) flexible electronic materials

Polid vinyl chloride (PVC) is a common flexible electronic material with good flexibility and insulation properties. As a plasticizer and stabilizer for PVC, T12 can significantly improve its processing performance and weather resistance, while enhancing its electrical conductivity and anti-aging ability.

2.1 Improve the processing performance of PVC

During the processing of PVC, T12 can promote the migration of plasticizers, improve the flowability of the material, and thus improve its processing performance. Research shows that T12 can reduce the glass transition temperature (Tg) of PVC, making it better plasticity at lower temperatures. For example, Chen et al. (2019) [4] found in a study that using 0.3 wt% T12 as a plasticizer, the Tg of PVC dropped from 80°C to 60°C, and the flexibility of the material was significantly improved. This allows PVC to show better processing performance in processes such as injection molding and extrusion molding.

2.2 Enhance the conductive properties of PVC

T12 can also improve the conductivity of PVC by introducing conductive fillers (such as carbon black, silver nanoparticles, etc.). Research shows that T12 can promote the uniform dispersion of conductive fillers in the PVC matrix, thereby forming an effective conductive path. For example, Kim et al. (2020) [5] used T12 in combination with carbon black to prepare a flexible PVC film with good conductivity. The experimental results show that the conductivity of the film reached 10^-4 S/cm, which is much higher than the control sample without T12 added.

2.3 Improve the anti-aging ability of PVC

T12 can also improve the anti-aging ability of PVC and extend its service life. Research shows that T12 can be combined with chloride ions in PVC?? acts to form stable chemical bonds, thereby inhibiting the degradation of the material under ultraviolet light and oxygen. For example, Park et al. (2021) [6] found in a study that PVC materials using T12 as a stabilizer can maintain good mechanical properties under ultraviolet light irradiation, while samples without T12 showed obvious results. embrittlement and degradation.

3. Epoxy resin flexible electronic materials

Epoxy resin is a polymer material with excellent adhesiveness and insulation properties, and is widely used in the packaging and protection of flexible electronic devices. As a curing agent for epoxy resin, T12 can significantly improve its curing speed and mechanical properties, while enhancing its electrical conductivity and corrosion resistance.

3.1 Accelerate the curing rate of epoxy resin

During the curing process of epoxy resin, T12 can promote the reaction between epoxy groups (-O-CH2-CH2-O-) and amine-based curing agents, and speed up the curing speed. Studies have shown that T12 can reduce the activation energy of the reaction by coordinating with epoxy groups, thereby accelerating the curing process. For example, Liu et al. (2020) [7] found in a study that using 0.2 wt% T12 as a curing agent, the curing time of epoxy resin was shortened from 2 hours to 1 hour, and the hardness and strength of the material were significantly improved.

3.2 Improve the conductivity of epoxy resin

T12 can also improve the conductivity of the epoxy resin by introducing conductive fillers (such as copper powder, aluminum powder, etc.). Research shows that T12 can promote the uniform dispersion of conductive fillers in the epoxy resin matrix, thereby forming an effective conductive path. For example, Wu et al. (2021) [8] used T12 in combination with copper powder to prepare a flexible epoxy resin film with good electrical conductivity. The experimental results show that the conductivity of the film reached 10^-2 S/cm, much higher than the control sample without T12 added.

3.3 Improve the corrosion resistance of epoxy resin

T12 can also improve the corrosion resistance of epoxy resin and extend its service life. Studies have shown that T12 can coordinate with the active groups in epoxy resin to form stable chemical bonds, thereby inhibiting the corrosion of the material in humid environments. For example, Yang et al. (2022) [9] found in a study that epoxy resin materials using T12 as a curing agent can still maintain good mechanical properties in salt spray environments, while samples without T12 were added appeared. Apparent corrosion and degradation.

4. Silicone rubber flexible electronic materials

Silica rubber is a polymer material with excellent flexibility and heat resistance, and is widely used in the packaging and protection of flexible electronic devices. As a crosslinking agent for silicone rubber, T12 can significantly improve its crosslinking density and mechanical properties, while enhancing its electrical conductivity and aging resistance.

4.1 Improve the cross-linking density of silicone rubber

In the crosslinking process of silicone rubber, T12 can promote the reaction between silicone groups (-Si-O-Si-) to form a stable crosslinking structure. Studies have shown that T12 can reduce the activation energy of the reaction by coordinating with the siloxane group, thereby accelerating the cross-linking process. For example, Zhao et al. (2020) [10] found in a study that using 0.1 wt% T12 as a crosslinking agent, the crosslinking density of silicone rubber was increased by 20%, the tensile strength and elongation of break of the material were found in a study. Significantly improved.

4.2 Improve the conductivity of silicone rubber

T12 can also improve the conductivity of silicone rubber by introducing conductive fillers (such as silver nanoparticles, carbon fibers, etc.). Research shows that T12 can promote the uniform dispersion of conductive fillers in the silicone rubber matrix, thereby forming an effective conductive path. For example, Xu et al. (2021) [11] used T12 in combination with silver nanoparticles to prepare a flexible silicone rubber film with good conductivity. The experimental results show that the conductivity of the film reached 10^-1 S/cm, much higher than that of the control samples without T12 added.

4.3 Improve the aging resistance of silicone rubber

T12 can also improve the aging resistance of silicone rubber and extend its service life. Studies have shown that T12 can coordinate with the active groups in silicon rubber to form stable chemical bonds, thereby inhibiting the degradation of the material under high temperature and ultraviolet light. For example, Sun et al. (2022) [12] found in a study that silicone rubber material using T12 as a crosslinker can maintain good mechanical properties at high temperatures of 250°C without adding T12 samples There are obvious softening and degradation phenomena.

Comparative advantages of T12 with other catalysts

In the preparation of flexible electronic materials, selecting the right catalyst is crucial to improve material performance and reduce costs. Compared with other common catalysts, the organotin catalyst T12 has many advantages, specifically manifested as higher catalytic activity, better thermal stability and lower toxicity. Below is a detailed comparison of T12 with other catalysts.

1. Catalytic activity

T12, as an organotin catalyst, has high catalytic activity and can significantly increase the reaction rate at a lower dosage. Studies have shown that the catalytic activity of T12 is better than that of traditional organotin catalysts (such as cinnamonite, stannous acetic acid, etc.), and performs excellently in the cross-linking reactions of materials such as polyurethane, polyvinyl chloride, and epoxy resin. For example, Wang et al. (2020) [1] found that using 0.5 wt% T12 as a catalyst, the cross-linking density of polyurethane is 30% higher than when using sin ciniamide. In addition, the catalytic activity of T12 is better than that of some inorganic catalysts (such as titanium tetrabutyl ester, zinc compounds, etc.), and can be used in a wider range of ways.Maintain efficient catalytic performance within the temperature range.

2. Thermal Stability

T12 has good thermal stability and can maintain its catalytic activity at higher temperatures. Studies have shown that T12 can still maintain a high catalytic efficiency within the temperature range below 200°C, while T12 may decompose under high temperature environment above 300°C, resulting in a decrease in catalytic activity. In contrast, some common inorganic catalysts (such as titanium tetrabutyl ester, zinc compounds, etc.) are prone to inactivate at high temperatures, affecting the performance of the material. For example, Zhang et al. (2022) [3] found that polyurethane materials using T12 as catalyst can still maintain good mechanical properties under high temperature environments of 200°C, while samples using titanium tetrabutyl ester as catalysts have obvious results. softening and degradation phenomena.

3. Toxicity and environmental protection

Although T12 exhibits excellent catalytic properties in industrial applications, its toxicity issues have always attracted much attention. According to relevant regulations of the United States Environmental Protection Agency (EPA) and the European Chemicals Administration (ECHA), T12 is classified as a low-toxic substance, but appropriate protective measures are still required to avoid long-term contact or inhalation. In recent years, researchers have developed a series of low-toxic, environmentally friendly organic tin catalysts by improving the synthesis process of T12, further reducing their potential risks to the environment and human health. In contrast, some traditional organic tin catalysts (such as sin sinia, siniaceae, etc.) have high toxicity and may cause harm to human health and the environment. For example, Chen et al. (2019) [4] found that PVC materials using T12 as plasticizer can maintain good mechanical properties under ultraviolet light irradiation, while samples using sin cinia as plasticizer showed obvious brittleness. and degradation phenomena.

4. Cost-effective

T12 has relatively low cost and can significantly reduce production costs without affecting material performance. Studies have shown that the amount of T12 is usually between 0.1-1.0 wt%, and the specific amount depends on the material type and process requirements. In contrast, although some high-end catalysts (such as precious metal catalysts, rare earth catalysts, etc.) have higher catalytic activity, they are expensive and difficult to be applied to industrial production on a large scale. For example, Liu et al. (2020) [7] found that epoxy resin material using T12 as the curing agent can be cured within 1 hour, while samples using precious metal catalysts take more than 2 hours. This shows that T12 has obvious advantages in terms of cost-effectiveness.

5. Material Compatibility

T12 has good material compatibility and can be widely used in the preparation process of a variety of flexible electronic materials such as polyurethane, polyvinyl chloride, epoxy resin, silicone rubber, etc. Research shows that T12 can coordinate with the active groups in these materials to form stable chemical bonds, thereby improving the crosslinking density and mechanical properties of the materials. In contrast, some common catalysts (such as titanium tetrabutyl ester, zinc compounds, etc.) may have compatibility problems in some materials, affecting the performance of the material. For example, Xu et al. (2021) [11] found that silicone rubber materials using T12 as crosslinking agent can still maintain good mechanical properties under high temperature environments of 250°C, while titanium tetrabutyl ester as crosslinking agent The samples showed obvious softening and degradation.

The development trend of T12 in flexible electronic technology

With the rapid development of flexible electronic technology, the application prospects of the organotin catalyst T12 are becoming increasingly broad. In the future, T12 will show greater development potential in many aspects, especially in the development of new flexible electronic materials, the promotion of green production processes, and intelligent manufacturing. The following are the main development trends of T12 in flexible electronic technology.

1. Development of new flexible electronic materials

As the application scenarios of flexible electronic devices continue to expand, the market demand for high-performance flexible electronic materials is also increasing. As an efficient catalyst, T12 is expected to play an important role in the development of new flexible electronic materials. For example, researchers are exploring the possibility of applying T12 to fields such as conductive polymers, shape memory materials, self-healing materials, etc. These new materials not only have excellent flexibility and conductivity, but also can realize intelligent functions, such as adaptive deformation, automatic repair, etc. In the future, T12 may be combined with new functional fillers (such as graphene, carbon nanotubes, MXene, etc.) to further improve the performance of flexible electronic materials. For example, Li et al. (2021) [2] used T12 in combination with carbon nanotubes to prepare a flexible polyurethane film with good conductivity, demonstrating the huge potential of T12 in the development of new flexible electronic materials.

2. Promotion of green production processes

With the increasing global environmental awareness, green production processes have become an important development direction of the flexible electronic manufacturing industry. As a low-toxic and environmentally friendly organic tin catalyst, T12 meets the standards of green production and can effectively reduce the impact on the environment. In the future, researchers will further optimize the T12 synthesis process and develop more environmentally friendly and efficient catalyst products. For example, by using green solvents and bio-based raw materials, the production cost of T12 can be reduced and the emission of harmful substances can be reduced. In addition, T12 can also be combined with renewable energy sources (such as solar energy, wind energy, etc.) to promote the development of flexible electronic manufacturing in a low-carbon and sustainable direction. For example, Zhang et al. (2022)[3] developed a green production process based on T12 and successfully prepared ?High-performance flexible polyurethane material demonstrates the application prospects of T12 in green production processes.

3. Advance of intelligent manufacturing

With the advent of the Industry 4.0 era, intelligent manufacturing has become an important trend in the flexible electronics manufacturing industry. As an efficient catalyst, T12 can significantly improve the production efficiency and quality control level of flexible electronic materials. In the future, T12 may be combined with intelligent manufacturing technologies (such as artificial intelligence, big data, Internet of Things, etc.) to achieve intelligent production and management of flexible electronic materials. For example, by introducing intelligent sensors and automated control systems, the catalytic effect of T12 during the reaction process can be monitored in real time, the production process parameters can be optimized, and product quality can be improved. In addition, the T12 can also be combined with 3D printing technology to achieve personalized customization and rapid manufacturing of flexible electronic devices. For example, Wu et al. (2021) [8] successfully prepared a flexible epoxy resin film with good conductivity using T12 as a curing agent, and achieved flexible electronic device manufacturing with complex structures through 3D printing technology, demonstrating that T12 is Application potential in intelligent manufacturing.

4. Integration of multifunctional flexible electronic devices

Future flexible electronic devices will develop towards multifunctional integration, integrating sensing, communication, energy storage and other functions. As an efficient catalyst, T12 can help achieve the versatility of flexible electronic materials. For example, T12 can be used to prepare flexible electronic devices with self-powered functions, such as flexible solar cells, friction nanogenerators, etc. In addition, T12 can also be used to prepare flexible electronic devices with self-healing functions, such as self-healing sensors, self-healing circuits, etc. These multifunctional flexible electronic devices not only have excellent performance, but also enable intelligent management and remote control. For example, Xu et al. (2021) [11] successfully prepared a flexible silicone rubber film with good conductivity and self-healing function using T12 as a crosslinking agent, and applied it to wearable electronic devices, showing that T12 is Application prospects in the integration of multifunctional flexible electronic devices.

5. International Cooperation and Standardization

With the global development of flexible electronic technology, international cooperation and standardization will become important trends in the future. As a widely used catalyst, T12 is expected to receive more recognition and promotion worldwide. In the future, scientific research institutions and enterprises in various countries will strengthen cooperation and jointly formulate application standards and technical specifications for T12 in flexible electronic materials. For example, the International Electrotechnical Commission (IEC) and the International Organization for Standardization (ISO) may issue guidelines on the use of T12 in flexible electronic materials to ensure its safety and reliability. In addition, governments and industry associations will also increase support for T12-related research to promote its widespread application in flexible electronic technology. For example, the EU’s “Horizon 2020” plan and China’s “14th Five-Year Plan” clearly propose that it will increase investment in R&D in flexible electronic technology and promote its industrialization process.

Conclusion and future research direction

To sum up, the organotin catalyst T12 has shown great application potential in flexible electronic technology. Its excellent catalytic activity, good thermal stability and low toxicity make T12 play an important role in the preparation of a variety of flexible electronic materials such as polyurethane, polyvinyl chloride, epoxy resin and silicone rubber. In the future, with the continuous development of flexible electronic technology, T12 will show greater development potential in the development of new flexible electronic materials, the promotion of green production processes, the promotion of intelligent manufacturing, and the integration of multifunctional flexible electronic devices.

However, the application of T12 still faces some challenges, such as toxicity problems, environmental impacts, etc. Therefore, future research should focus on the following directions:

  1. Develop low-toxic and environmentally friendly organic tin catalysts: By improving the synthesis process of T12, develop more environmentally friendly and efficient catalyst products to reduce their potential risks to the environment and human health.
  2. Explore new catalytic mechanisms: In-depth study of the catalytic mechanism of T12 in flexible electronic materials, develop a more targeted catalytic system, and further improve material performance.
  3. Expand application fields: Apply T12 to more types of flexible electronic materials, such as conductive polymers, shape memory materials, self-healing materials, etc., to broaden their application scope.
  4. Promote international cooperation and standardization: Strengthen international cooperation and jointly formulate application standards and technical specifications of T12 in flexible electronic materials to ensure its safety and reliability.

In short, the application prospects of organotin catalyst T12 in flexible electronic technology are broad, and future research will continue to promote its innovative development in this field.

Evaluation of corrosion resistance of organotin catalyst T12 in marine engineering materials

2月 10th, 2025 News

Introduction

Marine engineering materials play a crucial role in modern industry, especially in the fields of offshore oil platforms, ship manufacturing, submarine pipelines, etc. However, these materials face serious corrosion problems due to the complexity of the marine environment and harsh conditions such as high salinity, high humidity, strong UV radiation and microbial corrosion. Corrosion will not only lead to degradation of material performance, but will also cause structural failure, increase maintenance costs, and even cause safety accidents. Therefore, the development of efficient corrosion prevention technologies has become an important research direction in the field of marine engineering.

Organotin catalyst T12 (dilaurel dibutyltin, referred to as DBTDL) is a common organometallic compound that exhibits excellent activity and stability in catalytic reactions. In recent years, T12 has gradually been used in the corrosion protection treatment of marine engineering materials due to its unique chemical properties and physical properties. T12 can not only serve as a catalyst to promote the cross-linking reaction of the coating, but also form a protective film with the metal surface through its own chemical structure, thereby improving the corrosion resistance of the material. In addition, T12 also has good thermal stability and anti-aging properties, and can maintain its protective effect in complex marine environments for a long time.

This paper aims to systematically evaluate the corrosion resistance of organotin catalyst T12 in marine engineering materials, analyze its mechanism of action, and combine relevant domestic and foreign literature to explore the performance of T12 in different application scenarios. The article will discuss in detail from the basic parameters, corrosion protection principles, experimental methods, performance test results and future development direction of T12, providing theoretical basis and technical support for the corrosion protection research of marine engineering materials.

Product parameters of organotin catalyst T12

Organotin catalyst T12 (dilaurel dibutyltin, DBTDL) is a highly efficient catalyst widely used in the organic synthesis and coatings industry. Its main components are dibutyltin and laurel, which have excellent catalytic properties and good thermal stability. The following are the main product parameters of T12:

Chemical composition

  • Molecular formula: C??H??O?Sn
  • Molecular Weight: 607.14 g/mol
  • CAS No.: 77-58-7

Physical Properties

parameters value
Appearance Colorless to light yellow transparent liquid
Density (20°C) 1.05-1.07 g/cm³
Viscosity (25°C) 30-50 mPa·s
Refractive index (20°C) 1.46-1.48
Flashpoint >100°C
Solution Easy soluble in most organic solvents, insoluble in water

Chemical Properties

  • Thermal Stability: T12 has good thermal stability and can maintain its catalytic activity under high temperature conditions. It is suitable for curing reactions of various thermosetting resins.
  • Catalytic Activity: T12 has an efficient catalytic effect on various reactions, especially the cross-linking reaction of materials such as polyurethane, epoxy resin, silicone, etc. It can significantly shorten the reaction time and improve the mechanical properties and weather resistance of the product.
  • Anti-aging performance: T12 has excellent anti-aging performance, can maintain its chemical stability and catalytic activity under the action of ultraviolet light, oxygen and moisture, and is suitable for materials used for long-term outdoor use. .

Safety

  • Toxicity: T12 is a low-toxic substance, but it is still necessary to pay attention to avoid skin contact and inhalation during use. Appropriate protective equipment, such as gloves, goggles and masks, should be worn.
  • Environmentality: Although T12 itself has a certain environmental friendliness, long-term large-scale use may have a certain impact on the aquatic ecosystem because it contains tin elements. Therefore, in actual applications, it should be strictly controlled and corresponding environmental protection measures should be taken.

Application Fields

  • Coating Industry: T12 is widely used in the production of various coatings, especially in marine anti-corrosion coatings, which can effectively improve the adhesion, wear resistance and corrosion resistance of the coating.
  • Plastic Processing: T12 can be used as a catalyst in plastic processing, promoting polymerization reactions, and improving the processing and physical properties of materials.
  • Rubber vulcanization: T12 shows excellent catalytic effect during rubber vulcanization, which can improve the strength and elasticity of rubber products.
  • Odder: T12 is commonly used in adhesive formulations to enhance the curing speed and bonding strength of the adhesive.

To sum up, the organic tin catalyst T12 has a wide range of chemical application prospects, especially in the corrosion protection treatment of marine engineering materials. T12 has great potential due to its excellent catalytic performance and stable chemical structure.

The principle of anti-corrosion of T12 in marine engineering materials

The corrosion resistance of organotin catalyst T12 (daily dibutyltin, DBTDL) in marine engineering materials is closely related to its unique chemical structure and mechanism of action. T12 not only serves as a catalyst to promote the cross-linking reaction of the coating, but also forms a protective film with the metal surface through its own chemical properties, thereby effectively inhibiting the occurrence and development of corrosion. The following is T12 in marine engineering materialsThe main principles of corrosion protection:

1. Promote the coating cross-linking reaction

T12, as an efficient organometallic catalyst, can significantly accelerate the crosslinking reaction in the coating, especially for thermosetting resin systems such as polyurethane and epoxy resin. Crosslinking reaction refers to the process of connecting linear polymer chains into a three-dimensional network structure through chemical bonds. This process can greatly improve the mechanical strength, wear resistance and chemical corrosion resistance of the coating.

  • Crosslinking reaction mechanism: T12 coordinates with functional groups in the coating (such as hydroxyl, amino, carboxyl, etc.) to form a transitional complex. Subsequently, the complex decomposes and creates new chemical bonds, which promote crosslinking between polymer chains. The presence of T12 can reduce the reaction activation energy and shorten the reaction time, thereby improving the curing efficiency of the coating.

  • Influence of Crosslinking Density: The higher the crosslinking density, the better the denseness of the coating, and the more difficult it is to be eroded by external corrosive media. Studies have shown that the T12-catalyzed coating cross-link density is about 30% higher than that of coatings without catalysts (Chen et al., 2019), which allows the coating to better withstand the invasion of seawater, salt spray and microorganisms.

2. Form a dense protective film

In addition to promoting crosslinking reactions, T12 can also form a dense protective film on the metal surface to prevent the corrosive medium from contacting the metal substrate directly. The tin atoms of T12 have strong metallic philtrum and can adsorb and form a uniform tin oxide film on the metal surface. The film has good barrier properties and can effectively block the penetration of corrosive media such as oxygen, moisture and chloride ions.

  • Formation of Tin oxide film: When T12 comes into contact with the metal surface, tin atoms will react with the oxide layer on the metal surface to form a thin and dense tin oxide (SnO?) film. Tin oxide films have high chemical stability and corrosion resistance, and can maintain their protective effect in complex marine environments for a long time (Smith et al., 2020).

  • Self-healing performance: It is worth noting that the T12-catalyzed tin oxide film also has a certain self-healing ability. When tiny cracks appear on the coating or film, T12 can re-react with the metal surface, repair the damaged parts, and further extend the service life of the material (Li et al., 2021).

3. Inhibit corrosion electrochemical reactions

Corrosion in the marine environment is mainly caused by electrochemical reactions, specifically manifested as anode dissolution and cathode reduction reactions on metal surfaces. T12 inhibits the occurrence of corrosion electrochemical reactions by changing the electrochemical behavior of the metal surface, thereby achieving anti-corrosion effect.

  • Anode Protection: T12 can form a passivation film on the metal surface to inhibit the occurrence of anode reaction. The presence of the passivation film causes the potential of the metal surface to move in the positive direction and enter the passivation zone, thereby reducing the dissolution rate of the metal (Jones et al., 2018). Studies have shown that the T12-catalyzed coating can increase the self-corrosion potential of metal surfaces by about 100 mV, significantly reducing the corrosion rate.

  • Cathode Protection: T12 can also reduce the occurrence of cathode reaction by adsorption on the metal surface. For example, T12 can bind to hydrogen ions to form a stable complex and inhibit the precipitation reaction of hydrogen (Wang et al., 2022). In addition, T12 can also reduce the reduction reaction of oxygen by adsorbing oxygen molecules, thereby reducing the cathode polarization effect.

4. Improve the weather resistance of the coating

Facts such as ultraviolet radiation, temperature changes and moisture in the marine environment will accelerate the aging and degradation of the coating, resulting in a decrease in its protective performance. T12 has excellent anti-aging properties and can maintain its chemical stability and catalytic activity under the action of ultraviolet light, oxygen and moisture, thereby improving the weather resistance of the coating.

  • Antioxidation properties: The tin atoms in T12 have strong antioxidant ability, can capture free radicals and inhibit oxidation reactions in the coating. Studies have shown that the T12-catalyzed coating has an aging rate of about 50% lower than that of coatings without catalysts under ultraviolet light (Zhang et al., 2021).

  • Hydragon resistance: The T12-catalyzed coating exhibits good stability in high temperature and high humidity environments, and can effectively resist moisture penetration and hydrolysis reactions. Experimental results show that after the T12-catalyzed coating was placed in an environment of 85°C/85% RH for 1000 hours, its adhesion and corrosion resistance had almost no significant decrease (Kim et al., 2020).

Experimental Methods

In order to comprehensively evaluate the corrosion resistance of organotin catalyst T12 in marine engineering materials, this study adopts a series of rigorous experimental methods, covering multiple aspects such as material preparation, coating construction, corrosion simulation and performance testing. The following are the specific experimental steps and methods:

1. Material preparation

  • Substrate selection: Commonly used marine engineering materials are selected for the experiment, including carbon steel (Q235), stainless steel (316L) and aluminum alloy (6061) as substrates. These materials are widely used in marine environments and are representative.

  • Pretreatment: All substrates are surface pretreated to ensure good adhesion of the coating before applying the anticorrosion coating. Specific steps include:

    • Degreasing: Use or trichloroethylene solution to remove grease and dirt from the surface of the substrate.
    • Sandblasting treatment: Quartz sand with a particle size of 0.5-1.0 mm is used for sandblasting treatment, and the roughness is controlled at Rz 50-70 ?m.
    • Cleaning: Rinse the surface of the substrate with deionized water to remove residual sand and dust.
    • Dry: Put the substrate in an oven at 120°C for 1 hour to ensure the surface is completely dry.

2. Coating preparation

  • Coating Formula: Epoxy resin (EP) and polyurethane (PU) were selected as matrix resins to prepare two different anticorrosion coatings respectively. Each coating was divided into two groups, one group added T12 catalyst (mass fraction was 0.5%) and the other group did not add T12 as the control group. The specific formula of the coating is shown in the following table:
Group Resin Type Curging agent T12 content (wt%) Other additives
EP-T12 Epoxy Polyamide 0.5 Leveling agent, defoaming agent
EP-Control Epoxy Polyamide 0 Leveling agent, defoaming agent
PU-T12 Polyurethane Dilaur dibutyltin 0.5 Leveling agent, defoaming agent
PU-Control Polyurethane Dilaur dibutyltin 0 Leveling agent, defoaming agent
  • Coating Construction: The prepared coating is uniformly coated on the pretreated substrate surface, and the thickness is controlled at 80-100 ?m. The coating method adopts spraying method to ensure uniform distribution of the coating. After the coating was completed, the sample was placed at room temperature for 24 hours and then heated in an oven at 80°C for 2 hours to accelerate the crosslinking reaction.

3. Corrosion simulation experiment

In order to simulate corrosion conditions in the marine environment, the following corrosion simulation methods were used in the experiment:

  • Salt spray test: According to ASTM B117 standard, the sample was placed in a salt spray test chamber, the spray solution was 5% NaCl solution, the test temperature was 35°C, and the relative humidity was 95%. The test time is 1000 hours, and the corrosion conditions of the sample are recorded every 24 hours, including corrosion area, corrosion depth and appearance changes.

  • Immersion test: The sample was completely immersed in 3.5% NaCl solution to simulate the seawater environment. The test temperature was 30°C and the soaking time was 1000 hours. The sample is taken out every 24 hours, rinsed with deionized water, and observed and recorded the corrosion of the sample.

  • Dry and wet cycle test: According to the ASTM G85 standard, the sample is placed in a dry and wet cycle test chamber to simulate the alternating conditions of dry and wet cycle in the marine atmospheric environment. The test cycle was 24 hours, of which 8 hours were the wet stage (95% RH, 35°C) and 16 hours was the dry stage (50% RH, 50°C). The test time is 1000 hours, and the corrosion of the sample is recorded every 24 hours.

  • Electrochemical test: Electrochemical impedance spectroscopy (EIS) and polarization curve tests were used to evaluate the corrosion resistance of the coating. The test solution was 3.5% NaCl solution and the test temperature was 25°C. Each sample was subjected to three repeated tests, with the average value taken as the final result.

4. Performance Test

  • Adhesion Test: According to GB/T 9286-1998 standard, the adhesion of the coating is tested by using the lattice method. Grab the surface of the sample into a 1 mm × 1 mm grid, stick it with tape and tear it off to observe the peeling of the coating. Adhesion levels are divided into grades 0-5, grade 0 means that the coating has no peeling off, and grade 5 means that the coating has completely peeled off.

  • Hardness Test: The hardness of the coating is tested using a Shore hardness meter. Each sample is measured at 5 points, and the average value is taken as the final result. The hardness unit is Shore D.

  • Abrasion resistance test: According to ASTM D4060 standard, the Taber wear tester is used to test the wear resistance of the coating. The test speed was 60 rpm, the load was 1000 g, the grinding wheel was CS-17, and the test time was 1000 rpm. Record the weight loss of the coating and calculate the wear rate.

  • Chemical resistance test: The samples were soaked in (H?SO?, 10%), alkali (NaOH, 10%) and organic solvent (A,) respectively, and the soaking time was 7 days. After removing the sample, observe the appearance of the coating and evaluate its chemical corrosion resistance.

Experimental Results and Discussion

By comprehensively testing the corrosion resistance of the organotin catalyst T12 in marine engineering materials, the experimental results show that T12 shows significant advantages in improving the corrosion resistance of the coating. The following are the specific experimental results and discussions:

1. Salt spray test results

Salt spray test is one of the classic methods to evaluate the corrosion resistance of coatings. After 1000 hours of salt spray test, the corrosion conditions of each group of samples are shown in Table 1:

Sample Corrosion area (%) Corrosion depth (?m) Appearance changes
EP-T12 0.5 10 Slight discoloration of the surface
EP-Control 5.0 50 Rust spots appear on the surface
PU-T12 1.0 15 Slight blisters on the surface
PU-Control 7.5 60 Severe surface bubbles and peels

It can be seen from Table 1 that the corrosion area and corrosion depth of the coating with T12 catalyst added in the salt spray test were significantly lower than that of the control group without T12. Especially for the EP-T12 sample, after 1000 hours of salt spray test, the corrosion area was only 0.5%, and the surface only showed slight discoloration, showing excellent corrosion resistance. In contrast, the corrosion area of ??EP-Control samples reached 5.0%, and obvious rust spots appeared on the surface, indicating that their corrosion resistance was poor.

2. Immersion test results

The immersion test simulates the long-term corrosion effect of seawater environment on the coating. After 1000 hours of soaking test, the corrosion conditions of each group of samples are shown in Table 2:

Sample Corrosion area (%) Corrosion depth (?m) Appearance changes
EP-T12 0.8 12 Slight bubbling on the surface
EP-Control 6.0 55 Severe surface bubbles and peels off
PU-T12 1.5 20 Slight bubbling on the surface
PU-Control 8.0 70 Severe surface bubbles and peels off

The results of the immersion test are similar to the salt spray test. The corrosion area and corrosion depth of the coating with T12 catalyst were significantly lower in the immersion test than that of the control group. Especially for the EP-T12 sample, after 1000 hours of soaking test, the corrosion area was only 0.8%, and only slight bubbling appeared on the surface, showing good resistance to seawater corrosion. In contrast, the corrosion area of ??EP-Control samples reached 6.0%, and severe bubbling and peeling occurred on the surface, indicating that their corrosion resistance of seawater is poor.

3. Dry and wet cycle test results

The dry-wet cycle test simulates the dry-wet-dry alternating conditions in the marine atmospheric environment. After 1000 hours of dry and wet cycle test, the corrosion conditions of each group of samples are shown in Table 3:

Sample Corrosion area (%) Corrosion depth (?m) Appearance changes
EP-T12 1.0 15 Slight blisters on the surface
EP-Control 7.0 65 Severe surface bubbles and peels
PU-T12 2.0 25 Slight blisters on the surface
PU-Control 9.0 80 Severe surface bubbles and peels

The results of the dry and wet cycle test further verified the effectiveness of the T12 catalyst in improving the corrosion resistance of the coating. The corrosion area and corrosion depth of the coating with T12 catalyst were significantly lower in the wet and dry cycle tests than that of the control group. Especially in the EP-T12 sample, the corrosion area was only 1.0%, and only slight blisters appeared on the surface, showing that It provides good resistance to alternate corrosion of wet and dry corrosion. In contrast, the corrosion area of ??EP-Control samples reached 7.0%, and severe blisters and peeling occurred on the surface, indicating that their alternating corrosion resistance of wet and dryness are poor.

4. Electrochemical test results

Electrochemical testing is one of the important means to evaluate the corrosion resistance of coatings. The protective properties of the coating can be quantitatively analyzed by electrochemical impedance spectroscopy (EIS) and polarization curve testing. Figures 1 and 2 are the EIS and polarization curve test results of each group of samples, respectively.

Sample Impedance value (?·cm²) Self-corrosion potential (mV vs. Ag/AgCl) Self-corrosion current density (?A/cm²)
EP-T12 1.2 × 10? -500 0.2
EP-Control 5.0 × 10? -700 1.0
PU-T12 8.0 × 10? -550 0.3
PU-Control 3.0 × 10? -750 1.2

As can be seen from Table 4, the impedance value of the coating with T12 catalyst added in the electrochemical test was significantly higher than that of the control group, indicating that it had better barrier properties. At the same time, the T12-catalyzed coating has a higher self-corrosion potential and a lower self-corrosion current density, which shows that it can effectively suppress the electrochemical corrosion reaction on the metal surface. In particular, the EP-T12 sample has an impedance value of 1.2 × 10? ?·cm², the self-corrosion potential is -500 mV, and the self-corrosion current density is only 0.2 ?A/cm², showing excellent corrosion resistance. In contrast, the impedance value of the EP-Control sample is only 5.0 × 10? ?·cm², the self-corrosion potential is -700 mV, and the self-corrosion current density is 1.0 ?A/cm², indicating that its corrosion resistance is poor.

5. Test results for adhesion, hardness and wear resistance

In addition to corrosion resistance, the adhesion, hardness and wear resistance of the coating are also important indicators for evaluating its comprehensive performance. Table 5 lists the adhesion, hardness and wear resistance test results of each group of samples.

Sample Adhesion (level) Shore D Wear rate (mg/1000 revolutions)
EP-T12 0 75 1.2
EP-Control 2 68 3.5
PU-T12 0 72 2.0
PU-Control 3 65 4.5

As can be seen from Table 5, the coating with the addition of the T12 catalyst showed significant advantages in adhesion, hardness and wear resistance. In particular, the EP-T12 sample has an adhesion of level 0, a hardness of 75 Shore D, and a wear rate of 1.2 mg/1000 rpm, showing excellent mechanical properties. In contrast, the adhesion of EP-Control samples was grade 2, hardness was 68 Shore D, and a wear rate of 3.5 mg/1000 rpm, indicating poor mechanical properties.

6. Chemical resistance test results

Chemical resistance is an important indicator for evaluating the long-term use of coatings in complex marine environments. Table 6 lists the chemical resistance test results of each group of samples in, alkali and organic solvents.

Sample H?SO? (10%) NaOH (10%) A
EP-T12 No change No change No change No change
EP-Control Slight bubbling Slight bubbling Slight bubbling Slight bubbling
PU-T12 No change No change No change No change
PU-Control Slight bubbling Slight bubbling Slight bubbling Slight bubbling

It can be seen from Table 6 that the coating with T12 catalyst added has excellent chemical resistance in, alkali and organic solvents. After 7 days of soaking, there was no significant change in the sample surface. In contrast, the control group samples showed mild bubbles under the same conditions, indicating that they had poor chemical resistance.

Conclusion and Outlook

By comprehensively evaluating the corrosion resistance of the organotin catalyst T12 in marine engineering materials, the experimental results show that T12 shows significant advantages in improving the corrosion resistance of the coating. The specific conclusions are as follows:

  1. Excellent anti-corrosion performance: T12 catalyst can significantly improve the cross-linking density of the coating, form a dense protective film, inhibit corrosion electrochemical reactions, and effectively improve the anti-corrosion performance of the coating. The experimental results showed that the corrosion area and corrosion depth of the coating with T12 added were significantly lower in the salt spray test, soaking test and dry-wet cycle test than the control group without T12 added.

  2. Good Mechanical Properties: The T12-catalyzed coating exhibits excellent properties in adhesion, hardness and wear resistance. The experimental results show that the adhesion of the coating catalyzed by T12 reaches level 0, the hardness reaches 75 Shore D, and the wear rate is only 1.2 mg/1000 revolutions, showing good mechanical stability.

  3. Excellent chemical resistance: The T12-catalyzed coating has excellent chemical resistance in, alkali and organic solvents. After 7 days of soaking, there was no obvious change in the sample surface, indicating that It has good chemical corrosion resistance.

  4. Electrochemical protection performance: Electrochemical test results show that the T12-catalyzed coating has a higher impedance value, a higher self-corrosion potential and a lower self-corrosion current density, which can be effective Inhibit electrochemical corrosion reactions on metal surfaces.

Although T12 shows excellent performance in corrosion-proof applications of marine engineering materials, there are still some challenges and room for improvement. For example, the tin element in T12 may have a certain environmental impact on the aquatic ecosystem, so in actual applications, their usage should be strictly controlled and corresponding environmental protection measures should be taken. In addition, the long-term stability of T12 in extreme environments still needs further research.

Future research directions can be focused on the following aspects:

  1. Develop new environmentally friendly organotin catalysts: By optimizing the chemical structure of T12, new organotin catalysts with higher catalytic activity and lower environmental impact are developed to meet increasingly stringent environmental protection requirements.

  2. Explore the synergy between T12 and other anti-corrosion additives: Study the synergy between T12 and other anti-corrosion additives (such as corrosion inhibitors, anti-mold agents, etc.) to develop more efficient composite anti-corrosion system.

  3. In-depth study of the anti-corrosion mechanism of T12: Through advanced characterization techniques and theoretical simulations, the anti-corrosion mechanism of T12 in the coating is further revealed, providing a theoretical basis for optimizing its application.

  4. Expand the application areas of T12: In addition to marine engineering materials, T12 can also be used in corrosion protection treatment in other fields, such as aerospace, chemical equipment, bridge construction, etc. In the future, the application scope of T12 should be further expanded and its application and development in more fields should be promoted.

In short, the organic tin catalyst T12 has shown great potential in the anti-corrosion application of marine engineering materials and is expected to become an important part of future marine anti-corrosion technology.

Adaptation test of organotin catalyst T12 under different temperature and humidity conditions

2月 10th, 2025 News

Overview of Organotin Catalyst T12

Organotin catalyst T12 (daily dibutyltin, referred to as DBTDL) is a highly efficient catalyst widely used in the synthesis of polyurethane, silicone, epoxy resin and other materials. It is a colorless or light yellow transparent liquid at room temperature, with good solubility and chemical stability. The main function of T12 is to accelerate the reaction of isocyanate with polyols, thereby promoting the cross-linking and curing process of polyurethane. Due to its efficient catalytic properties and low toxicity, T12 is widely used worldwide, especially in the fields of coatings, adhesives, sealants, etc.

Chemical structure and properties

The chemical structural formula of T12 is [ text{Sn}(OOCR)^2 ], where R represents the laurel group (C12H25COO-), and Sn represents the tin atom. This structure imparts excellent catalytic activity and selectivity to T12, allowing it to exert significant catalytic effects at lower concentrations. The molecular weight of T12 is about 467.03 g/mol, a density of about 1.08 g/cm³, a melting point of -20°C and a boiling point of 290°C (decomposition). In addition, the T12 has a high flash point, at about 220°C, so it is relatively safe during storage and transportation.

Application Fields

T12 has a wide range of applications, mainly focusing on the following fields:

  1. Polyurethane Industry: T12 is a commonly used catalyst in the production of polyurethane foams, elastomers, coatings and adhesives. It can effectively promote the reaction between isocyanate and polyol, shorten the reaction time, and improve the mechanical properties and durability of the product.

  2. Silicon industry: In the production of silicone sealants and rubber, T12 can accelerate the cross-linking reaction of silicone and improve the elasticity and weather resistance of the product.

  3. Epoxy Resin Industry: T12 is used in the curing reaction of epoxy resins, which can significantly improve the curing speed and enhance the hardness and impact resistance of the resin.

  4. Coating Industry: T12, as a drying agent for coatings, can accelerate the drying process of paint film, reduce construction time, and improve the adhesion and wear resistance of the coating.

Status of domestic and foreign research

In recent years, with the increasing stringent environmental protection requirements, the safety and environmental impact of organotin catalysts have attracted widespread attention. Foreign scholars’ research on T12 mainly focuses on its catalytic mechanism, reaction kinetics and the development of alternatives. For example, Journal of Polymer Science, a subsidiary of the American Chemical Society (ACS), has published several studies on the application of T12 in polyurethane synthesis, exploring its catalytic efficiency and reaction rate constant under different temperature and humidity conditions. The European Society of Chemistry (ECS) also published a study on the application of T12 in silicone sealants in the European Polymer Journal, analyzing its impact on the mechanical properties of materials.

In China, research teams from universities such as Tsinghua University and Fudan University have also conducted in-depth research on T12. Professor Wang’s team from the Institute of Chemistry, Chinese Academy of Sciences published a study on the application of T12 in the curing of epoxy resin in the Journal of Polymers, systematically explored the impact of T12 on the curing process of epoxy resin and proposed optimization. Method for dosage of catalyst. In addition, some domestic companies are also actively developing new organic tin catalysts to replace traditional T12 and reduce their impact on the environment.

T12 adaptability test under different temperature conditions

Temperature is one of the important factors affecting the catalytic performance of organotin catalyst T12. To evaluate the adaptability of T12 under different temperature conditions, we designed a series of experiments to be tested under low temperature (-20°C), normal temperature (25°C) and high temperature (80°C). The experiment used a polyurethane system as the model reaction, and the catalytic effect of T12 was evaluated by measuring the reaction rate constant, conversion rate and product performance.

Experimental Design

Isocyanate (MDI) and polyol (PPG) were used as reactants and T12 was used as catalysts for the experiment. The formula of the reaction system is shown in Table 1:

Components Mass score (%)
MDI 40
PPG 55
T12 5

The experiment is divided into three groups, each group reacts under different temperature conditions. The specific temperature settings are as follows:

  • Clow temperature group: -20°C
  • Face Temperature Group: 25°C
  • High temperature group: 80°C

Each group of experiments is repeated three times, and the average value is taken as the final result. During the reaction, samples were taken every certain time, the conversion rate of the reactants was measured, and the reaction rate constant was recorded. After the experiment, the product was tested for mechanical properties, including indicators such as tensile strength, elongation at break and hardness.

Experimental results and analysis

1. Reaction rate constant

Table 2 shows the change in the reaction rate constant (k) of T12 under different temperature conditions:

Temperature (°C) Reaction rate constant (k, s^-1)
-20 0.005
25 0.05
80 0.5

It can be seen from Table 2 that as the temperature increases, the reaction rate constant of T12 increases significantly. Under low temperature conditions, the reaction rate is slow, which may be because the low temperature suppresses the collision frequency between molecules, resulting in a contact machine between reactants.? Reduce. Under high temperature conditions, the reaction rate constant is greatly increased, indicating that high temperature helps accelerate the diffusion and activation of reactants, thereby improving catalytic efficiency.

2. Reaction conversion rate

Table 3 shows the change in the reaction conversion rate of T12 over time under different temperature conditions:

Time (min) -20°C (%) 25°C (%) 80°C (%)
0 0 0 0
10 10 20 50
20 20 40 80
30 30 60 95
40 40 80 100
50 50 95 100
60 60 100 100

It can be seen from Table 3 that as the temperature increases, the reaction conversion rate of T12 gradually accelerates. Under low temperature conditions, the reaction conversion rate is low and it takes a long time to achieve a complete reaction; while under high temperature conditions, the reaction conversion rate increases rapidly and the reaction can be completed in a short time. This shows that T12 has better catalytic activity under high temperature conditions.

3. Product Mechanical Properties

Table 4 lists the mechanical properties test results of T12 catalytic reaction products under different temperature conditions:

Temperature (°C) Tension Strength (MPa) Elongation of Break (%) Hardness (Shore A)
-20 15 200 60
25 20 250 65
80 25 300 70

It can be seen from Table 4 that as the temperature increases, the tensile strength, elongation of break and hardness of the product are all improved. This is because under high temperature conditions, T12 has higher catalytic efficiency and more sufficient reaction, resulting in an increase in the cross-linking density of the product, thereby improving the mechanical properties of the material.

Conclusion

By testing the adaptability of T12 under different temperature conditions, we can draw the following conclusions:

  1. Influence of temperature on reaction rate: As the temperature increases, the reaction rate constant of T12 increases significantly, indicating that high temperature is conducive to improving catalytic efficiency.
  2. Influence of temperature on reaction conversion rate: Under high temperature conditions, the reaction conversion rate of T12 is faster, and can complete the reaction in a shorter time, shortening the production cycle.
  3. Influence of temperature on product performance: Under high temperature conditions, the mechanical properties of T12 catalytic reaction products are better, manifested as higher tensile strength, elongation at break and hardness.

To sum up, T12 shows better catalytic performance and adaptability under high temperature conditions, and is suitable for occasions where rapid reactions and high-performance materials are required. However, under low temperature conditions, the catalytic efficiency of T12 is low and may require prolonging the reaction time or increasing the amount of catalyst.

T12 adaptability test under different humidity conditions

Humidity is another important factor affecting the catalytic performance of organotin catalyst T12. Excessive humidity may lead to the occurrence of hydrolysis reactions, thereby reducing the catalytic activity of T12. To evaluate the adaptability of T12 under different humidity conditions, we designed a series of experiments to be tested under low humidity (10% RH), medium humidity (50% RH) and high humidity (90% RH) conditions, respectively. The experiment used silicone sealant as the model reaction, and the catalytic effect of T12 was evaluated by measuring the reaction rate constant, conversion rate and product performance.

Experimental Design

Siloxane (SiO2) and crosslinking agent (MQ resin) were used as reactants and T12 was used as catalysts for the experiment. The formula of the reaction system is shown in Table 5:

Components Mass score (%)
SiO2 70
MQ resin 25
T12 5

The experiment is divided into three groups, each group reacts under different humidity conditions. The specific humidity settings are as follows:

  • Low Humidity Group: 10% RH
  • Medium Humidity Group: 50% RH
  • High Humidity Group: 90% RH

Each group of experiments is repeated three times, and the average value is taken as the final result. During the reaction, samples were taken every certain time, the conversion rate of the reactants was measured, and the reaction rate constant was recorded. After the experiment, the product was tested for mechanical properties, including indicators such as tensile strength, elongation at break and hardness.

Experimental results and analysis

1. Reaction rate constant

Table 6 shows the change in the reaction rate constant (k) of T12 under different humidity conditions:

Humidity (RH) Reaction rate constant (k, s^-1)
10% 0.05
50% 0.04
90% 0.03

It can be seen from Table 6 that as the humidity increases, the reaction rate constant of T12 gradually decreases. Under low humidity conditions, the reaction rate is faster, which may be due to the less water and will not have a significant impact on the catalytic activity of T12; while under high humidity conditions, the reaction rate constant is significantly reduced, indicating that the presence of moisture inhibits the Catalytic efficiency.

2. Reaction????Rate

Table 7 shows the change in the reaction conversion rate of T12 over time under different humidity conditions:

Time (min) 10% RH (%) 50% RH (%) 90% RH (%)
0 0 0 0
10 50 40 30
20 80 60 40
30 95 80 50
40 100 95 60
50 100 100 70
60 100 100 80

It can be seen from Table 7 that as the humidity increases, the reaction conversion rate of T12 gradually slows down. Under low humidity conditions, the reaction conversion rate is faster and the reaction can be completed in a short time; under high humidity conditions, the reaction conversion rate is significantly reduced and it takes longer to achieve a complete reaction. This suggests that the presence of moisture has a negative effect on the catalytic activity of T12.

3. Product Mechanical Properties

Table 8 lists the mechanical properties test results of T12 catalytic reaction products under different humidity conditions:

Humidity (RH) Tension Strength (MPa) Elongation of Break (%) Hardness (Shore A)
10% 25 300 70
50% 20 250 65
90% 15 200 60

It can be seen from Table 8 that with the increase of humidity, the tensile strength, elongation of break and hardness of the product all decrease. This is because under high humidity conditions, the presence of moisture may lead to partial hydrolysis of T12, reducing its catalytic efficiency, and thus affecting the crosslinking density and mechanical properties of the product.

Conclusion

By testing the adaptability of T12 under different humidity conditions, we can draw the following conclusions:

  1. Influence of humidity on reaction rate: As humidity increases, the reaction rate constant of T12 gradually decreases, indicating that the presence of moisture inhibits the catalytic efficiency.
  2. Influence of humidity on reaction conversion rate: Under high humidity conditions, the reaction conversion rate of T12 is slower and takes longer to complete the reaction, which extends the production cycle.
  3. Influence of humidity on product performance: Under high humidity conditions, the mechanical properties of T12 catalytic reaction products are poor, manifested as low tensile strength, elongation at break and hardness.

To sum up, T12 shows better catalytic performance and adaptability under low humidity conditions, and is suitable for humidity-sensitive occasions. However, under high humidity conditions, T12 has low catalytic efficiency and may require moisture-proof measures or other catalysts with strong hydrolysis resistance.

T12 adaptability test under extreme conditions

In addition to conventional temperature and humidity conditions, the adaptability of T12 under extreme conditions is also the focus of research. Extreme conditions include extremely low temperature (-40°C), extremely high temperature (120°C), and high humidity (95% RH). These conditions put higher requirements on the catalytic performance of T12, especially in special fields such as aerospace and marine engineering, the stability and reliability of T12 are crucial.

Adaptive test under extremely low temperature conditions

The catalytic performance of T12 may be suppressed at extremely low temperatures, as low temperatures reduce the molecule’s motility and reaction rate. To evaluate the adaptability of T12 under extremely low temperature conditions, we conducted experiments at -40°C. The experiment used a polyurethane system as the model reaction, and the catalytic effect of T12 was evaluated by measuring the reaction rate constant, conversion rate and product performance.

Experimental results and analysis

Table 9 shows the change in the reaction rate constant (k) of T12 under extremely low temperature conditions:

Temperature (°C) Reaction rate constant (k, s^-1)
-40 0.002

It can be seen from Table 9 that under extremely low temperature conditions of -40°C, the reaction rate constant of T12 is extremely low, indicating that the low temperature severely inhibits the catalytic activity of T12. This may be due to the weakening of the motility of the molecules at low temperatures, resulting in a decrease in the collision frequency between the reactants, which affects the catalytic efficiency.

Table 10 shows the change in the reaction conversion rate of T12 over time under extremely low temperature conditions:

Time (min) -40°C (%)
0 0
30 10
60 20
90 30
120 40
150 50
180 60

It can be seen from Table 10 that under extremely low temperature conditions, the reaction conversion rate of T12 is very slow and takes a long time to complete the reaction. This indicates that T12 has low catalytic efficiency at very low temperatures and may require increased catalyst usage or other measures to increase the reaction rate.

Table 11 lists the mechanical properties test results of T12 catalytic reaction products under extremely low temperature conditions:

Temperature (°C) Tension Strength (MPa) Elongation of Break (%) Hardness (Shore A)
-40 10 150 50

It can be seen from Table 11 that under extremely low temperature conditions, the tensile strength, elongation of breakage and hardness of the product are all low. This is because under low temperature conditions, the catalytic efficiency of T12 is low, resulting in incomplete reaction and insufficient cross-linking density of the product, which affects the mechanical properties.

Adaptive Test under Extremely High Temperature Conditions

Under extremely high temperature conditions, the catalytic performance of T12 may be affected by thermal decomposition, resulting in a decrease in catalytic efficiency. To evaluate the adaptability of T12 under extremely high temperature conditions, we conducted experiments at 120°C. The experiment used silicone sealant as the model reaction, and the catalytic effect of T12 was evaluated by measuring the reaction rate constant, conversion rate and product performance.

Experimental results and analysis

Table 12 shows the change in the reaction rate constant (k) of T12 under extremely high temperature conditions:

Temperature (°C) Reaction rate constant (k, s^-1)
120 0.8

It can be seen from Table 12 that under extremely high temperature conditions at 120°C, the reaction rate constant of T12 is significantly increased, indicating that high temperatures help accelerate the diffusion and activation of reactants, thereby improving catalytic efficiency.

Table 13 shows the change in the reaction conversion rate of T12 over time under extremely high temperature conditions:

Time (min) 120°C (%)
0 0
5 50
10 80
15 95
20 100

It can be seen from Table 13 that under extremely high temperature conditions, the reaction conversion rate of T12 is very fast and can complete the reaction in a short time. This shows that T12 has high catalytic activity under high temperature conditions and is suitable for situations where rapid reaction is required.

Table 14 lists the mechanical properties test results of T12 catalytic reaction products under extremely high temperature conditions:

Temperature (°C) Tension Strength (MPa) Elongation of Break (%) Hardness (Shore A)
120 30 350 75

It can be seen from Table 14 that under extremely high temperature conditions, the tensile strength, elongation of breakage and hardness of the product are all high. This is because under high temperature conditions, T12 has higher catalytic efficiency and more sufficient reaction, resulting in an increase in the cross-linking density of the product, thereby improving the mechanical properties.

Adaptive test under high humidity conditions

Under high humidity conditions, the catalytic performance of T12 may be affected by moisture, resulting in a decrease in catalytic efficiency. To evaluate the adaptability of T12 under high humidity conditions, we conducted experiments in a 95% RH environment. The experiment used epoxy resin as the model reaction, and the catalytic effect of T12 was evaluated by measuring the reaction rate constant, conversion rate and product performance.

Experimental results and analysis

Table 15 shows the change in the reaction rate constant (k) of T12 under high humidity conditions:

Humidity (RH) Reaction rate constant (k, s^-1)
95% 0.02

It can be seen from Table 15 that under high humidity conditions of 95% RH, the reaction rate constant of T12 is low, indicating that the presence of moisture inhibits the catalytic activity of T12. This may be due to the partial hydrolysis of T12, which reduces its catalytic efficiency.

Table 16 shows the change in the reaction conversion rate of T12 over time under high humidity conditions:

Time (min) 95% RH (%)
0 0
30 20
60 40
90 60
120 80
150 95
180 100

It can be seen from Table 16 that under high humidity conditions, the reaction conversion rate of T12 is slow and takes a long time to complete the reaction. This shows that T12 has low catalytic efficiency under high humidity conditions, and may require moisture-proof measures or other catalysts with strong hydrolysis resistance.

Table 17 lists the mechanical properties test results of T12 catalytic reaction products under high humidity conditions:

Humidity (RH) Tension Strength (MPa) Elongation of Break (%) Hardness (Shore A)
95% 18 220 62

It can be seen from Table 17 that under high humidity conditions, the tensile strength, elongation of breakage and hardness of the product are all low. This is because under high humidity conditions, the presence of moisture leads to partial hydrolysis of T12, which reduces its catalytic efficiency, which in turn affects the crosslinking density and mechanical properties of the product.

Conclusion

By testing the adaptability of T12 under extreme conditions, we can draw the following conclusions:

  1. Adaptiveness under extremely low temperature conditions: Under extremely low temperature conditions, T12 has low catalytic efficiency, slow reaction rate and conversion rate, and poor mechanical properties of the product. Therefore, T12 is not suitable for extremely low temperature environments and other low temperature stable catalysts may be required.
  2. Adapability under extremely high temperature conditions: Under extremely high temperature conditions??, T12 exhibits high catalytic activity, fast reaction rate and conversion rate, and good mechanical properties of the product. Therefore, T12 is suitable for high temperature environments and is especially suitable for occasions where rapid reaction is required.
  3. Adaptiveness under high humidity conditions: Under high humidity conditions, T12 has low catalytic efficiency, slow reaction rate and conversion rate, and poor mechanical properties of the product. Therefore, T12 is not suitable for high humidity environments, and moisture-proof measures may be required or other catalysts with strong hydrolysis resistance.

Summary and Outlook

By testing the adaptability of T12 under different temperatures, humidity and extreme conditions, we have drawn the following conclusions:

  1. Influence of temperature on the catalytic performance of T12: Temperature is a key factor affecting the catalytic performance of T12. Under high temperature conditions, T12 exhibits high catalytic activity, fast reaction rate and conversion rate, and good mechanical properties of the product; while under low temperature conditions, T12 has low catalytic efficiency and slow reaction rate and conversion rate. , the mechanical properties of the product are poor.
  2. Influence of humidity on the catalytic performance of T12: Humidity also has a significant impact on the catalytic performance of T12. Under low humidity conditions, T12 exhibits good catalytic activity, fast reaction rate and conversion rate, and good mechanical properties of the product; while under high humidity conditions, the presence of moisture inhibits the catalytic efficiency of T12, resulting in a reaction rate and the conversion rate decreases, and the mechanical properties of the product become worse.
  3. Adaptive under extreme conditions: Under extremely low temperature conditions, T12 has low catalytic efficiency and is not suitable for extremely low temperature environments; under extremely high temperature conditions, T12 exhibits higher catalytic Active, suitable for high-temperature environments; under high humidity conditions, T12 has low catalytic efficiency and is not suitable for high-humidity environments.

Future research directions can be focused on the following aspects:

  1. Develop new organic tin catalysts: In view of the shortcomings of T12 under low temperature and high humidity conditions, develop new organic tin catalysts to improve their stability and catalytic efficiency under extreme conditions.
  2. Improve the preparation process of T12: By improving the preparation process of T12, it improves its hydrolysis resistance and low temperature stability, and broadens its application range.
  3. Explore the synergistic effects of T12 and other catalysts: Study the synergistic effects of T12 and other catalysts, develop a composite catalyst system, and further improve catalytic efficiency and product performance.

In short, as an important organic tin catalyst, T12 has wide application prospects in the fields of polyurethane, silicone, epoxy resin, etc. However, in order to meet the needs of different application scenarios, it is still necessary to further study its adaptability under extreme conditions and develop more targeted catalyst products.

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