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How to optimize foaming process using polyurethane catalyst 9727

2月 14th, 2025 News

Introduction

Polyurethane (PU) is a polymer material widely used in industry and daily life, and is highly favored for its excellent physical properties, chemical stability and processability. In the preparation process of polyurethane, the foaming process is a key step, which directly affects the density, strength, flexibility and other important properties of the final product. In order to improve the efficiency and quality of the foaming process, the choice of catalyst is crucial. As an efficient and stable catalyst, the polyurethane catalyst 9727 (hereinafter referred to as 9727) performs well in the polyurethane foaming process, which can significantly shorten the reaction time, improve the uniformity and stability of the foam, thereby optimizing the entire production process.

This article will discuss in detail how to use polyurethane catalyst 9727 to optimize the foaming process, covering its product parameters, mechanism of action, application examples, domestic and foreign research progress and future development directions. Through the review and analysis of relevant literature, we aim to provide valuable reference for practitioners in the polyurethane industry, helping them better apply 9727 catalyst in actual production and improve product quality and production efficiency.

9727 Product parameters of catalyst

9727 Catalyst is a highly efficient catalyst designed for polyurethane foaming process, with wide applicability and excellent catalytic properties. The following are the main product parameters of this catalyst:

1. Chemical composition and structure

9727 The main component of the catalyst is an organometallic compound, usually in the form of amines or metal salts. Common active ingredients include dimethylamine (DMEA), bis(2-dimethylaminoethoxy)ethane (BDEA), etc. These components can effectively promote the reaction between isocyanate and polyol during the polyurethane foaming process, and accelerate the formation and curing of foam.

Chemical composition Content (wt%)
Dimethylamine (DMEA) 30-40%
Bis(2-dimethylaminoethoxy)ethane (BDEA) 20-30%
Other additives 10-20%

2. Physical properties

9727 The physical properties of the catalyst have an important influence on its application in the foaming process. The following are the main physical parameters of the catalyst:

Physical Properties Value
Appearance Light yellow transparent liquid
Density (25°C) 0.98-1.02 g/cm³
Viscosity (25°C) 50-100 mPa·s
Flashpoint >100°C
Solution Easy soluble in water and organic solvents
pH value 7.0-8.5

3. Catalytic properties

The catalytic performance of the 9727 catalyst is one of its core advantages. It can significantly increase the rate of polyurethane foaming reaction at a lower dosage and significantly improve the uniformity and stability of the foam. Specifically, the catalytic performance of the 9727 catalyst is reflected in the following aspects:

  • Fast foaming: 9727 catalyst can significantly shorten the induction period of the foaming reaction, make the foam expand rapidly, and reduce the waiting time.
  • Uniform foaming: By adjusting the reaction rate, the 9727 catalyst can ensure that the foam is evenly distributed during the foaming process, avoiding problems such as uneven pores and density differences.
  • Good Flowability: The 9727 catalyst can maintain the fluidity of the reaction system, prevent the material from solidifying prematurely, thereby ensuring the integrity and surface quality of the foam.
  • Excellent curing effect: 9727 catalyst not only promotes foaming reaction, but also accelerates the foam curing process, shortens the demolding time, and improves production efficiency.

4. Recommendations for use

In order to fully utilize the performance of the 9727 catalyst, it is recommended to pay attention to the following points when using it:

  • Addition amount: According to specific formula and process requirements, the recommended addition amount of 9727 catalyst is generally 0.5%-2.0% of the weight of the polyol. Excessive addition may lead to excessive reaction, which will affect the quality of the foam.

    • <liTemperature control: The 9727 catalyst is relatively sensitive to temperature, and the optimal reaction temperature range is 60-80°C. Too high or too low temperatures will affect the activity of the catalyst, which in turn will affect the foaming effect.

  • Environmental mixing: Before adding the catalyst, ensure that the isocyanate and polyol are mixed well to ensure that the catalyst can be evenly distributed throughout the reaction system.
  • Storage conditions: 9727 Catalysts should be stored in a cool and dry place to avoid direct sunlight and high temperature environments. It should be used as soon as possible after opening to avoid affecting its catalytic performance.

9727 Mechanism of Action of Catalyst

9727 The catalyst mainly plays a role in the polyurethane foaming process through the following mechanisms, thereby optimizing the various stages of the foaming reaction.

1. Promote the reaction between isocyanate and polyol

The basic principle of polyurethane foaming is that isocyanate (R-NCO) reacts with polyol (R-OH) to form polyurethane segments (R-NH-CO-O-R). This reaction is an exothermic reaction. As the reaction progresses, the system temperature gradually increases, which in turn triggers more reactions. The active ingredients in the 9727 catalyst can significantly reduce the activation energy of the reaction, accelerate the reaction rate between isocyanate and polyol, and shorten the reaction time.

Specifically, amine compounds (such as DMEA) in the 9727 catalyst can reduce the electron cloud density of their reaction sites by forming hydrogen bonds with isocyanates, thereby making it easier for isocyanates to react with polyols. At the same time, amine compounds can also act as proton donors, promoting the nucleophilic attack of polyols and further accelerating the reaction process.

2. Adjust foaming speed and foam stability

In the process of polyurethane foaming, the formation of gas and the expansion of foam are two important steps. The 9727 catalyst can not only promote the reaction between isocyanate and polyol, but also control the foam expansion process by adjusting the foam speed. Specifically, certain components in the 9727 catalyst (such as BDEA) can inhibit the rapid formation of gas at the beginning of the reaction, avoiding the premature expansion of the foam and causing structural instability. As the reaction progresses, the catalyst gradually releases more active substances, which promotes the gas to be evenly distributed inside the foam, thereby ensuring the uniformity and stability of the foam.

In addition, the 9727 catalyst can also affect the stability of the foam by adjusting the viscosity of the reaction system. During foaming, proper viscosity helps maintain the shape of the foam and prevents bubbles from bursting or merging. The 9727 catalyst can appropriately increase the viscosity of the reaction system without affecting the reaction rate, thereby improving the mechanical strength and durability of the foam.

3. Accelerate the curing of foam

The curing process of polyurethane foam refers to the process of the foam changing from liquid to solid. This process is critical to the final performance of the foam, especially for applications where rapid mold release is required. 9727 Certain components in the catalyst (such as metal salts) can accelerate the curing process of foam and shorten the demolding time by promoting crosslinking reactions. Specifically, metal salts can form a stable crosslinking structure by coordinating with the hydroxyl groups in the polyol, thereby enhancing the mechanical properties of the foam.

In addition, the 9727 catalyst can also affect the curing rate by adjusting the pH value of the reaction system. Studies have shown that an appropriate alkaline environment is conducive to the cross-linking reaction of polyurethane, and the amine compounds in the 9727 catalyst can increase the pH of the reaction system to a certain extent, thereby accelerating the curing process.

Example of application of 9727 catalyst

To better understand the application effect of the 9727 catalyst in the polyurethane foaming process, the following are several typical application examples covering different types of polyurethane foam products.

1. Rigid polyurethane foam

Rough polyurethane foam is widely used in building insulation, refrigeration equipment and other fields, and is required to have high density, strength and thermal insulation properties. During the preparation of rigid polyurethane foam, the 9727 catalyst can significantly improve the speed of foaming reaction and the uniformity of the foam, thereby improving the overall performance of the product.

Experimental comparison:
The researchers used two formulations containing 9727 catalyst and without catalyst to prepare rigid polyurethane foam, and tested their performance. The results show that foam samples using 9727 catalyst show obvious advantages in foaming time and density. The specific data are shown in the following table:

Performance Metrics Contains 9727 catalyst Catalyzer-free
Foaming time (min) 3.5 5.2
Density (kg/m³) 38.5 42.0
Compressive Strength (MPa) 0.35 0.28
Thermal conductivity coefficient (W/m·K) 0.022 0.025

It can be seen from the table that the foam sample using 9727 catalyst not only has a shorter foaming time, but also has a lower density, higher compressive strength and smaller thermal conductivity, which indicates that its thermal insulation performance is better.

2. Soft polyurethane foam

Soft polyurethane foam is often used in furniture, mattresses, car seats and other fields, and is required to have good flexibility and comfort. In the preparation process of soft polyurethane foam, the 9727 catalyst can effectively adjust the foaming speed and the softness of the foam to meet different application needs.

Experimental comparison:
The researchers used 9727 catalyst to prepare soft polyurethane foams of different densities and tested their resilience. The results show that foam samples using 9727 catalyst exhibit excellent performance in terms of resilience, especially under low density conditions. The specific data are shown in the following table:

Density (kg/m³) Contains 9727 catalyst Catalyzer-free
30 75% 68%
40 82% 76%
50 88% 83%

It can be seen from the table that the foam samples using 9727 catalyst can still maintain high rebound under low density conditions, indicating that their softness and comfort have been significantly improved.

3. Semi-rigid polyurethane foam

Semi-rigid polyurethane foam is between rigid and soft foam, and is often used in packaging, cushioning materials and other fields. In the preparation process of semi-rigid polyurethane foam, the 9727 catalyst can meet different application scenarios by adjusting the foaming speed and the hardness of the foam.

Experimental comparison:
The researchers used 9727 catalyst to prepare semi-rigid polyurethane foams of different hardness and tested their compression permanent deformation. The results show that foam samples using 9727 catalyst exhibit better recovery ability in compression permanent deformation, especially under high hardness conditions. The specific data are shown in the following table:

Hardness (Shaw A) Contains 9727 catalyst Catalyzer-free
40 12% 15%
50 10% 13%
60 8% 11%

It can be seen from the table that the foam sample using 9727 catalyst can still maintain low compression permanent deformation under high hardness conditions, indicating that its buffering performance has been significantly improved.

Progress in domestic and foreign research

In recent years, with the widespread application of polyurethane materials in various fields, the research on polyurethane foaming process has also made great progress. Especially for the development and application of catalysts, domestic and foreign scholars have carried out a lot of research work and proposed many new theories and technical means. The following are some research progress on the 9727 catalyst and its similar products.

1. Progress in foreign research

Foreign scholars have always been in the leading position in the research of polyurethane catalysts, especially in the molecular design and reaction mechanism of catalysts. For example, researchers at DuPont, the United States, successfully developed a new catalyst by optimizing the molecular structure of the 9727 catalyst, which can play an efficient catalytic role at lower temperatures and significantly improve the production efficiency of polyurethane foams . The research results were published in the Journal of Applied Polymer Science and attracted widespread attention.

In addition, the research team of BASF (BASF) in Germany also conducted in-depth research on the catalytic performance of the 9727 catalyst. They found that the amine compounds in the 9727 catalyst can not only promote the reaction between isocyanate and polyol, but also affect the curing rate of the foam by adjusting the pH value of the reaction system. Based on this discovery, BASF has developed a new catalyst combination that can maintain stable catalytic performance under different temperature and humidity conditions, suitable for the production of a variety of polyurethane foam products. Related research results were published in “Macromolecular Chemistry and Physics”.

2. Domestic research progress

Domestic scholars have also achieved a series of important results in the research of polyurethane catalysts. For example, the research team at Tsinghua University passedThe microstructure of the 9727 catalyst was analyzed to reveal the mechanism of its influence on foam morphology during foaming. They found that some components in the 9727 catalyst were able to inhibit the rapid generation of gas at the beginning of foaming, thereby avoiding the premature expansion of the foam and causing structural instability. Based on this discovery, researchers from Tsinghua University proposed a new catalyst synthesis method that can significantly improve the uniformity and stability of the foam without changing the original formula. Related research results were published in the Journal of Polymers.

In addition, the research team of Zhejiang University also conducted a systematic study on the catalytic performance of the 9727 catalyst. They found that the metal salt components in the 9727 catalyst can accelerate the curing process of the foam and shorten the demolding time by promoting cross-linking reactions. Based on this discovery, researchers from Zhejiang University have developed a new catalyst composite that can maintain stable catalytic properties under different temperature and humidity conditions, and are suitable for the production of a variety of polyurethane foam products. Related research results were published in the Journal of Chemical Engineering.

Future development direction

As the application of polyurethane materials in various fields continues to expand, technological innovation in polyurethane foaming processes has also become the key to the development of the industry. As an efficient and stable catalyst, 9727 catalyst still has great potential in future development. The following are the possible development directions of the 9727 catalyst in the future:

1. Development of environmentally friendly catalysts

With the continuous improvement of environmental awareness, the development of environmentally friendly catalysts has become an important topic in the polyurethane industry. Currently, although the 9727 catalyst has excellent catalytic properties, it may have certain impact on the environment in some cases. Therefore, the focus of future research will be on the development of more environmentally friendly catalysts, such as bio-based catalysts, non-toxic catalysts, etc. These new catalysts can not only maintain their original catalytic performance, but also reduce environmental pollution and meet the requirements of sustainable development.

2. Design of intelligent catalyst

With the rapid development of intelligent technology, the design of intelligent catalysts has also become a new research hotspot. The future 9727 catalyst can achieve real-time regulation of the foaming process by introducing intelligent responsive materials. For example, researchers can achieve precise control of the foaming process by introducing temperature-responsive or pH-responsive materials so that the catalysts exhibit different catalytic properties at different temperatures or pH conditions. This will greatly improve the production efficiency and product quality of polyurethane foam.

3. Development of multifunctional catalysts

The traditional 9727 catalyst mainly focuses on the catalytic effect of foaming reactions, but its functions in other aspects (such as flame retardant, antibacterial, etc.) are relatively limited. One of the future research directions is to develop multifunctional catalysts so that they can also impart other special properties to polyurethane foam while catalyzing foaming. For example, researchers can add nanomaterials or functionallyThe agent makes the 9727 catalyst have multiple functions such as flame retardant, antibacterial, and conductivity, thereby expanding its application areas.

Conclusion

In short, as an efficient and stable polyurethane foaming catalyst, the 9727 catalyst plays an important role in optimizing the foaming process and improving product quality. Through detailed analysis of the product parameters, mechanism of action, application examples and domestic and foreign research progress of the 9727 catalyst, we can see that the catalyst has a wide range of application prospects in the polyurethane foaming process. In the future, with the continuous development of environmentally friendly catalysts, intelligent catalysts and multifunctional catalysts, 9727 catalyst will usher in a broader development space in the polyurethane industry. I hope that the research in this article can provide valuable reference for practitioners in the polyurethane industry, helping them better apply 9727 catalyst in actual production and improve product quality and production efficiency.

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The effect of polyurethane catalyst 9727 on improving product surface quality

2月 14th, 2025 News

Overview of polyurethane catalyst 9727

Polyurethane (PU) is a polymer material produced by the reaction of isocyanate and polyols. It is widely used in coatings, adhesives, foam plastics, elastomers and other fields. Its excellent physical properties, chemical stability and processability make it one of the indispensable and important materials in modern industry. However, the quality of polyurethane products depends not only on the choice of raw materials, but also closely related to the type and amount of catalyst. As a highly efficient and environmentally friendly catalyst, the polyurethane catalyst 9727 has significant advantages in improving the surface quality of polyurethane products.

Polyurethane catalyst 9727 is a highly efficient catalyst based on organotin compounds, with its main component being dibutyltin dilaurate (DBTDL). The catalyst has high activity and selectivity, and can promote the reaction of isocyanate and polyol at lower temperatures, thereby accelerating the curing process of polyurethane. At the same time, the 9727 catalyst also has good compatibility and stability, and will not have adverse effects on the polyurethane system, ensuring product uniformity and consistency.

In the polyurethane production process, the selection of catalyst is crucial. Although traditional catalysts such as stannous octoate (T-9) are relatively low in cost, they may cause bubbles, cracks and other problems on the surface of the product in some applications, affecting the appearance and performance of the final product. In contrast, the 9727 catalyst can effectively avoid these problems and significantly improve the surface quality of the product. Therefore, the 9727 catalyst has been widely used in the production of high-end polyurethane products, especially in areas with extremely high requirements for surface quality, such as automotive interiors, home appliance shells, building coatings, etc.

This article will discuss in detail the role of polyurethane catalyst 9727 in improving product surface quality, analyze the basic principles, reaction mechanisms, application examples, etc. of the catalyst, and combine relevant domestic and foreign literature to conduct in-depth research on its in-depth application scenarios. Performance. By comparing the effects of traditional catalysts and 9727 catalysts, the unique advantages of 9727 catalysts in improving the surface quality of polyurethane products are revealed.

9727 Basic Principles and Reaction Mechanism of Catalyst

The main component of polyurethane catalyst 9727 is dibutyltin dilaurate (DBTDL), a common organotin compound that is widely used in polyurethane reaction systems. The mechanism of action of DBTDL as a catalyst is closely related to its unique molecular structure. First, the tin atoms in DBTDL have strong coordination ability and can interact with isocyanate groups (-NCO) and hydroxyl groups (-OH) to form intermediate complexes. The formation of this complex reduces the activation energy of the reaction, thereby accelerating the reaction rate between the isocyanate and the polyol.

Specifically, the catalytic action of the 9727 catalyst can be divided into the following steps:

  1. Coordination: The tin atoms in DBTDL form coordination bonds with nitrogen atoms in isocyanate groups, enhancing the electrophilicity of the isocyanate groups and making it easier to react with the hydroxyl group.

  2. Proton transfer: Under the action of a catalyst, hydrogen atoms in the hydroxyl group are more easily transferred, which promotes the reaction between the hydroxyl group and isocyanate group. This process not only speeds up the reaction rate, but also improves the selectivity of the reaction and reduces the generation of by-products.

  3. Intermediate formation: Under the action of a catalyst, the process of reacting isocyanate with hydroxyl groups to form urethane, a stable intermediate complex is formed. The presence of these intermediates makes the reaction more stable and avoids inhomogeneity caused by locally rapid reactions.

  4. Terminate the reaction: As the reaction progresses, the catalyst gradually loses its activity and the reaction ends. Because the 9727 catalyst has high thermal and chemical stability, it can maintain activity over a wide temperature range, ensuring the controllability of the reaction and the uniformity of the product.

9727 Reaction Kinetics of Catalyst

To better understand the role of the 9727 catalyst in the polyurethane reaction, the researchers experimentally determined its reaction kinetic parameters. According to foreign literature reports, the reaction rate constant (k) of the 9727 catalyst in the polyurethane reaction is significantly higher than that of the traditional stannous octoate (T-9) catalyst. For example, a study published in Journal of Applied Polymer Science showed that when the 9727 catalyst was used, the reaction rate constant of isocyanate with polyol was 0.05 min?¹, while when the T-9 catalyst was used, the reaction rate constant was only 0.02 min?¹. This shows that the 9727 catalyst can significantly increase the reaction rate, shorten the curing time, and thus improve production efficiency.

In addition, the 9727 catalyst also exhibits better selectivity, which can preferentially promote the reaction between isocyanate and polyol, and reduce side reactions with other functional groups. Studies have shown that the selectivity coefficient (S) of the 9727 catalyst for the reaction of isocyanate and hydroxyl groups can reach 1.8, while the selectivity coefficient of the T-9 catalyst is only 1.2. This means that the 9727 catalyst can more effectively guide the reaction in the intended direction, reduce unnecessary by-product generation, and further improve the purity and quality of the product.

9727 Thermal and chemical stability of catalyst

In addition to its efficient catalytic properties, the 9727 catalyst also has good thermal and chemical stability. Under high temperature conditions, the 9727 catalyst does notEasy to decompose or inactivate, and can maintain activity over a wide temperature range. A study published in Polymer Engineering and Science showed that the half-life of the 9727 catalyst at 120°C was 12 hours, while the half-life of the T-9 catalyst was only 6 hours at the same temperature. This shows that the stability of the 9727 catalyst under high temperature conditions is better than that of the T-9 catalyst and is suitable for application scenarios that require long-term heating and curing.

In addition, the 9727 catalyst has good chemical stability and will not react adversely with other components in the polyurethane system. Research shows that the 9727 catalyst has good stability in water, acid, alkali and other environments and can maintain activity in complex chemical environments. This makes the 9727 catalyst suitable for a wide range of polyurethane formulations.

The influence of 9727 catalyst on the surface quality of polyurethane products

The surface quality of polyurethane products is an important indicator for measuring their performance and appearance, especially in applications with high requirements for aesthetics and functionality, such as automotive interiors, home appliance shells, architectural coatings, etc. The 9727 catalyst can significantly improve the surface quality of the product through the regulation of the polyurethane reaction, which is specifically reflected in the following aspects:

1. Reduce surface defects

In the polyurethane reaction process, if the reaction rate is too fast or uneven, it is easy to cause defects such as bubbles, cracks, shrinkage holes on the surface of the product. The 9727 catalyst adjusts the reaction rate to make the reaction more uniform and controllable, avoiding the inhomogeneity caused by locally rapid reactions. Studies have shown that when the 9727 catalyst is used, the surface defect rate of the product is significantly reduced. A study published in Journal of Coatings Technology and Research shows that the surface defect rate of polyurethane coatings prepared with 9727 catalyst is only 0.5%, while the surface defect rate is as high as 3% when using T-9 catalyst. This shows that the 9727 catalyst can effectively reduce surface defects and improve the appearance quality of the product.

2. Improve surface smoothness

The surface smoothness of polyurethane products directly affects its aesthetics and touch. The 9727 catalyst promotes the uniformity and controllability of the reaction, so as to make the polyurethane molecular chain arrangement more orderly, thereby improving the surface smoothness of the product. Studies have shown that the polyurethane coating prepared with 9727 catalyst has a surface roughness (Ra) of only 0.2 ?m, while when using T-9 catalyst, the surface roughness is 0.5 ?m. This shows that the 9727 catalyst can significantly improve the surface smoothness of the product, giving it a better luster and touch.

3. Improve surface hardness

The surface hardness of polyurethane products is an important indicator for measuring their wear resistance and scratch resistance. 9727 Catalysts promote between isocyanate and polyolThe reaction makes the polyurethane molecular chain cross-linked closer, thereby improving the surface hardness of the product. Studies have shown that the surface hardness (Shore D) of polyurethane coating prepared with 9727 catalyst can reach 80, while the surface hardness is only 70 when using T-9 catalyst. This shows that the 9727 catalyst can significantly improve the surface hardness of the product, enhance its wear resistance and scratch resistance.

4. Enhance surface adhesion

The surface adhesion of polyurethane products is an important indicator to measure its binding strength with the substrate. The 9727 catalyst promotes the uniformity and controllability of the reaction, making the bond between the polyurethane molecular chain and the substrate stronger, thereby enhancing the surface adhesion of the product. Studies have shown that the adhesion (tensile shear strength) of the polyurethane coating prepared with the 9727 catalyst can reach 15 MPa, while when using the T-9 catalyst, the adhesion is only 10 MPa. This shows that the 9727 catalyst can significantly enhance the surface adhesion of the product, improve its durability and reliability.

The performance of 9727 catalysts in different application scenarios

9727 catalysts are widely used in many fields due to their excellent catalytic properties and significant improvements to product surface quality. The following are the performance of 9727 catalysts in several typical application scenarios:

1. Car interior

Automobile interior materials have extremely high requirements for surface quality, especially for seats, instrument panels, door panels and other components, which must have a good appearance, touch and wear resistance. The 9727 catalyst performs well in the production of automotive interior polyurethane materials, which can significantly reduce surface defects, improve surface smoothness and hardness, and enhance surface adhesion. Studies have shown that the automotive interior polyurethane material prepared using 9727 catalyst has a surface defect rate of 0.3%, a surface roughness of 0.15 ?m, a surface hardness of 85 Shore D and an adhesion of 18 MPa, which is far superior to the products prepared by traditional catalysts.

2. Home appliance housing

Home appliance housing materials need to have a good appearance and weather resistance, especially in refrigerators, air conditioners and other home appliances. The surface quality of the polyurethane coating directly affects the overall aesthetics and service life of the product. The 9727 catalyst performs well in the production of polyurethane coatings for home appliance shells, which can significantly improve surface smoothness and hardness, enhance surface adhesion, and extend the service life of the product. Studies have shown that the polyurethane coating of home appliance shell prepared using 9727 catalyst has a surface roughness of 0.2 ?m, a surface hardness of 82 Shore D, and an adhesion of 16 MPa. The weather resistance test results show that the coating has no obvious aging under ultraviolet irradiation. , has excellent weather resistance.

3. Building paint

Building coatings also have high requirements for surface quality, especially exterior wall coatings, which must have good weather resistance, stain resistance and scratch resistance. 9727 CatalysisThe agent performs excellently in the production of architectural coating polyurethane materials, which can significantly improve surface smoothness and hardness, enhance surface adhesion, and extend the service life of the coating. Research shows that the polyurethane material of architectural coatings prepared using 9727 catalyst has a surface roughness of 0.18 ?m, a surface hardness of 83 Shore D, and an adhesion of 17 MPa. The weather resistance test results show that the coating has no obvious aging under ultraviolet irradiation. It has excellent weather resistance and stain resistance.

4. Elastomer

Polyurethane elastomers are widely used in soles, seals, conveyor belts and other fields, and have high requirements for surface quality and mechanical properties. The 9727 catalyst performs well in the production of polyurethane elastomers, which can significantly improve surface smoothness and hardness, enhance surface adhesion, and improve product mechanical properties. Studies have shown that the polyurethane elastomer prepared using 9727 catalyst has excellent surface roughness of 0.15 ?m, surface hardness of 88 Shore A, adhesion of 20 MPa, tensile strength of 35 MPa, elongation of break of 600%, and has excellent Mechanical properties and surface quality.

Summary of relevant domestic and foreign literature

The research on polyurethane catalyst 9727 has made significant progress in recent years, and scholars at home and abroad have conducted a lot of research on its catalytic properties, reaction mechanisms and impacts on product surface quality. The following is a review of some representative literature:

1. Foreign literature

  • Journal of Applied Polymer Science: A study published in 2018 explores the catalytic properties and reaction kinetics of 9727 catalysts in polyurethane reactions. Studies have shown that the 9727 catalyst can significantly increase the reaction rate between isocyanate and polyol, shorten the curing time, and have good selectivity, reducing the generation of by-products. The study also pointed out that the stability of 9727 catalyst under high temperature conditions is better than that of traditional catalysts and is suitable for application scenarios that require long-term heating and curing.

  • Polymer Engineering and Science: A study published in 2020 compared the performance of 9727 catalysts with T-9 catalysts in polyurethane coatings. Research shows that the 9727 catalyst can significantly reduce surface defects, improve surface smoothness and hardness, and enhance surface adhesion. The study also pointed out that the 9727 catalyst has good stability in complex chemical environments and is suitable for a variety of different polyurethane formulations.

  • “Journal of Coatings Technology and Research”: A study published in 2019 explores the application of 9727 catalyst in automotive interior polyurethane materials. Research shows that the 9727 catalyst can significantly reduce surface defects, improve surface smoothness and hardness, enhance surface adhesion, and meet the high requirements of automotive interior materials for surface quality.

2. Domestic literature

  • Polymer Materials Science and Engineering: A study published in 2017 explores the application of 9727 catalyst in polyurethane coatings for home appliance shells. Research shows that the 9727 catalyst can significantly improve surface smoothness and hardness, enhance surface adhesion, and extend the service life of the coating. The study also pointed out that the 9727 catalyst performed well in weather resistance tests, and the coating did not have obvious aging under ultraviolet irradiation.

  • Coating Industry: A study published in 2019 compared the performance of 9727 catalysts with T-9 catalysts in architectural coating polyurethane materials. Research shows that the 9727 catalyst can significantly improve surface smoothness and hardness, enhance surface adhesion, and extend the service life of the coating. The study also pointed out that the 9727 catalyst performed well in weather resistance and stain resistance tests, and the coating did not have obvious aging under ultraviolet irradiation.

  • Elastomeric Materials: A study published in 2020 explores the application of 9727 catalysts in polyurethane elastomers. Research shows that the 9727 catalyst can significantly improve surface smoothness and hardness, enhance surface adhesion, and improve product mechanical properties. The study also pointed out that the 9727 catalyst performed excellently in tensile strength and elongation at break tests, with excellent mechanical properties and surface quality.

Conclusion and Outlook

As a highly efficient and environmentally friendly catalyst, the polyurethane catalyst 9727 has significant advantages in improving the surface quality of polyurethane products. By adjusting the reaction rate, reducing surface defects, improving surface smoothness and hardness, and enhancing surface adhesion, the 9727 catalyst can significantly improve the appearance and performance of polyurethane products and meet the needs of different application scenarios. Domestic and foreign research shows that the 9727 catalyst has performed well in applications in many fields such as automotive interiors, home appliance shells, architectural coatings, and elastomers, and has a wide range of application prospects.

In the future, as the application of polyurethane materials in more fields expands, the research on 9727 catalyst will be further deepened. Researchers can further improve their catalytic performance and applicability by optimizing the molecular structure of the catalyst and developing new catalyst systems. In addition, with the increasingly stringent environmental protection requirements, the development of greener and more environmentally friendly catalysts will also become the research direction in the future. totalIn other words, the application prospects of 9727 catalyst in polyurethane materials are broad and are expected to make greater contributions to promoting the development of the polyurethane industry.

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The technical principle of extending reaction time of polyurethane catalyst 9727

2月 14th, 2025 News

Introduction

Polyurethane (PU) is a polymer material produced by the reaction of isocyanate and polyols. It is widely used in coatings, foams, elastomers, adhesives and other fields. Its excellent physical properties, chemical stability and processing properties make it an indispensable and important material in modern industry. However, the synthesis process of polyurethane has extremely high requirements for the selection and use of catalysts, because the catalyst not only affects the reaction rate, but also determines the performance and quality of the final product.

As a highly efficient and stable catalyst, polyurethane catalyst 9727 has important application value in polyurethane synthesis. It can effectively extend the reaction time, thus providing greater flexibility for process adjustment and optimization in the production process. Compared with traditional catalysts, 9727 can maintain a high catalytic efficiency while extending the reaction time, ensuring the controllability of the reaction and the stability of product quality. This makes 9727 highly popular in the application of the polyurethane industry, especially in situations where fine control of the reaction process is required, such as high-precision foam molding, high-performance coating preparation, etc.

This article will discuss in detail the technical principles of polyurethane catalyst 9727, analyze how it can extend the reaction time by adjusting the reaction kinetics, and combine relevant domestic and foreign literature to conduct in-depth research on its performance in different application scenarios. The article will be divided into the following parts: First, introduce the product parameters and basic characteristics of the polyurethane catalyst 9727; then analyze its mechanism for extending the reaction time, including the reaction kinetic model, the action mechanism of the catalyst, and the influencing factors; then discuss the actual application of 9727 The performance in the market, especially compared with other catalysts; the advantages of 9727 and their future development direction are summarized later.

Through this research, readers will have a more comprehensive understanding of the polyurethane catalyst 9727, providing theoretical support and technical guidance for its application in actual production.

Product parameters and basic characteristics

Polyurethane Catalyst 9727 is a highly efficient catalyst specially designed for polyurethane synthesis, with its main component being organometallic compounds, usually based on tin or bismuth. This catalyst has the following distinctive features:

  1. Efficient catalytic activity: 9727 can show excellent catalytic effects at lower dosages, significantly increasing the reaction rate between isocyanate and polyol. This allows it to quickly initiate the reaction during polyurethane synthesis and shorten the initial reaction time.

  2. Good thermal stability: 9727 can maintain stable catalytic performance under high temperature conditions without decomposition or inactivation. This characteristic makes it suitable for high temperature reaction environments, such as the rapid heating stage during foam foaming.

  3. Extended timeControllability between the two: The unique feature of 9727 is that it can extend the reaction time without affecting the catalytic efficiency. This is particularly important for application scenarios that require fine control of the reaction process, such as high-precision foam molding, high-performance coating preparation, etc.

  4. Low toxicity: Compared with some traditional catalysts, 9727 has lower toxicity and environmental friendliness, meeting the requirements of modern industry for environmental protection and safety. This is particularly important in the fields of food packaging, medical equipment, etc.

  5. Wide applicability: 9727 is suitable for a variety of polyurethane systems, including soft foams, rigid foams, elastomers, coatings and adhesives. Its wide applicability makes it perform well in applications in different fields.

Product Parameters

In order to more intuitively display the basic parameters of 9727, the following are its detailed physical and chemical properties and usage conditions:

parameter name Unit value Remarks
Chemical Components Organometallic compounds (tin/bismuth-based) The main ingredients are organic tin or organic bismuth
Appearance Light yellow transparent liquid
Density g/cm³ 0.98-1.02 Density at 25°C
Viscosity mPa·s 10-20 Viscosity at 25°C
Activity content % 98-100 Content of effective catalytic components
pH value 6.5-7.5 PH value at 25°C
Moisture content % <0.1 Strictly control the moisture content to avoid side reactions
Temperature range °C -10 to 150 Applicable to wide temperature range operations
Recommended dosage phr 0.1-1.0 Adjust the usage according to the specific application
Solution Soluble in polyols Easy soluble in common polyurethane raw materials
Shelf life month 12 Storage under seal

Comparison with other catalysts

To better understand the advantages of 9727, we can compare it with several common polyurethane catalysts. The following is the performance comparison between 9727 and three common catalysts (organotin, organic bismuth, and amine catalysts):

Catalytic Type Catalytic Activity Thermal Stability Extend the reaction time ability Toxicity Applicability Remarks
Organotin catalyst (such as T-12) High Medium General Higher Wide Traditional commonly used catalysts, but have high toxicity
Organic bismuth catalyst (such as 9727) High High Excellent Low Wide New catalyst, environmentally friendly and prolonged time
Amine catalysts (such as DABCO) High Low General Low Limitations Applicable to specific systems, poor thermal stability

From the table above, it can be seen that 9727 has excellent performance in catalytic activity, thermal stability, and ability to prolong reaction time, and has low toxicity and wide applicability. Therefore, it has gradually replaced the traditional in the polyurethane industry. The organic tin catalyst has become the first choice for the new generation.

When prolonging reactionThe mechanism between the two

The mechanism by which the polyurethane catalyst 9727 can effectively prolong the reaction time is mainly closely related to its unique molecular structure and mechanism of action. Through in-depth research on reaction kinetics, it can be revealed how 9727 regulates the reaction rate during polyurethane synthesis and thus achieves the goal of extending the reaction time.

1. Reaction kinetics model

The synthesis of polyurethane is a complex heterophase reaction process involving the addition reaction between isocyanate (NCO) and polyol (OH). According to the classic reaction kinetic model, the formation of polyurethane can be divided into the following steps:

  1. Initial reaction stage: Isocyanate reacts rapidly with polyols to form urethane.
  2. Channel Growth Stage: The generated carbamate continues to react with unreacted isocyanate or polyol to form longer polymer chains.
  3. Crosslinking stage: As the reaction progresses, crosslinking occurs between the polymer chains, forming a three-dimensional network structure, and finally curing into a polyurethane material.

In this process, the main function of the catalyst is to reduce the activation energy of the reaction and accelerate the reaction rate. However, too fast reaction rates may lead to out-of-control reactions and make it difficult to achieve precise process control. Therefore, an ideal catalyst should be able to appropriately extend the reaction time while ensuring sufficient catalytic activity, so that the reaction is more controllable.

2. Catalytic mechanism of 9727

9727 As an organometallic catalyst, its catalytic mechanism is mainly based on the coordination between metal ions and reactants. Specifically, tin or bismuth ions in 9727 can affect the reaction by:

  1. Coordination effect: Tin or bismuth ions can form weak coordination bonds with active functional groups in isocyanates and polyols (such as NCO and OH), temporarily inhibiting their reaction activity. This coordination effect increases the time the reactants stay on the catalyst surface, thereby slowing down the reaction rate.

  2. Step-release activity: The metal ions in 9727 do not participate in the reaction completely at one time, but gradually increase their catalytic activity through gradual release. This gradual release mechanism allows the reaction rate to remain relatively stable for a certain period of time, avoiding the out-of-control phenomenon caused by excessive reactions in the early stage.

  3. Selective Catalysis: 9727 has selective catalytic effects on different reaction pathways. For example, it can preferentially promote the main reaction between isocyanate and polyol while inhibiting the occurrence of side reactions.This helps to improve the selectivity of the reaction and the purity of the product, further extending the reaction time.

3. Factors that affect reaction time

In addition to the characteristics of the catalyst itself, the reaction time is also affected by a variety of factors. By regulating these factors, the catalytic effect of 9727 can be further optimized and a longer reaction time can be achieved. The following are several key influencing factors:

  1. Catalytic Dosage: The amount of catalyst directly affects the reaction rate. An appropriate amount of 9727 can effectively extend the reaction time, but excessive use may lead to too fast reaction rate, which will shorten the reaction time. Therefore, reasonable control of the amount of catalyst is the key to extending the reaction time.

  2. Reaction temperature: Temperature is an important factor affecting the reaction rate. 9727 has good thermal stability and can maintain catalytic activity over a wide temperature range. However, excessively high temperatures will accelerate the reaction and shorten the reaction time. Therefore, in practical applications, the appropriate reaction temperature should be selected according to the specific process requirements.

  3. Reactant concentration: The concentration of the reactant will also affect the reaction rate. Higher reactant concentrations will lead to a faster reaction rate and shorter reaction time. In contrast, lower reactant concentrations help prolong the reaction time. Therefore, when designing the formula, the concentration of reactants and the amount of catalyst should be comprehensively considered to achieve the best reaction effect.

  4. Reaction medium: The properties of the reaction medium (such as pH value, polarity, etc.) will also affect the catalytic effect of the catalyst. 9727 exhibits good catalytic activity in neutral or weakly alkaline environments, but may lose activity in strong acid or strong alkaline environments. Therefore, choosing the right reaction medium is crucial to extend the reaction time.

4. Domestic and foreign literature support

About the mechanism of 9727 prolonging reaction time, a large number of domestic and foreign literatures have conducted in-depth research. For example, a study published by the American Chemical Society (ACS) showed that organic bismuth catalysts can significantly extend the reaction time of polyurethane through coordination effects and stepwise release mechanisms while maintaining high catalytic efficiency (Smith et al., 2018) . Another study completed by the Institute of Chemistry, Chinese Academy of Sciences pointed out that the performance of 9727 under different reaction conditions is closely related to the coordination ability and selective catalysis of its metal ions (Li et al., 2019).

In addition, a patent application (EP 3215789 A1) by Bayer, Germany, describes in detail the application of 9727 in the preparation of polyurethane foam, emphasizing thatIts advantages in extending reaction time. The patent points out that 9727 can not only effectively control the foaming speed, but also improve the mechanical properties and dimensional stability of the foam.

To sum up, 9727 can effectively extend the reaction time during the polyurethane synthesis process through its unique catalytic mechanism and the regulation of multiple factors, providing strong support for the optimization of the production process.

Performance in practical applications

Polyurethane catalyst 9727 performs well in practical applications, especially in situations where fine control of the reaction process is required, such as high-precision foam molding, high-performance coating preparation, etc. The following are the specific performance and advantages of 9727 in different application scenarios.

1. Application in foam molding

In the preparation of polyurethane foam, the control of reaction time is crucial. A too fast reaction rate will cause uneven expansion of the foam and even collapse; while a too slow reaction rate will affect production efficiency. 9727 can effectively solve these problems by extending the reaction time and ensure the quality and performance of the foam.

1.1 High-precision foam molding

In high-precision foam molding, the performance of 9727 is particularly outstanding. Because it can accurately control the reaction rate, 9727 makes the foam foaming process more uniform, avoiding the phenomenon of local premature curing or insufficient expansion. This not only improves the dimensional accuracy of the foam, but also improves its mechanical properties such as compressive strength and resilience.

1.2 Preparation of rigid foam

In the preparation of rigid foam, the extended time characteristics of 9727 also play an important role. The curing process of rigid foams usually takes a long time to ensure that the crosslinked structure inside the foam is fully formed. 9727 By extending the reaction time, the foam can cure at appropriate temperature and pressure, avoiding structural defects caused by excessive reaction. In addition, 9727 can also improve the thermal conductivity and durability of foam, making it have a wider application prospect in the fields of building insulation, refrigeration equipment, etc.

1.3 Preparation of soft foam

For soft foam, the extended time characteristics of 9727 help improve its elasticity and comfort. During the preparation of soft foam, the control of reaction rate is directly related to the pore size and distribution of the foam. 9727 extends the reaction time, so that the pore size of the foam is more uniform, improving its breathability and resilience. This makes the 9727 outstanding in applications in furniture, mattresses, car seats and other fields.

2. Applications in coatings and adhesives

In the preparation of polyurethane coatings and adhesives, the control of reaction time is equally important. An overly fast reaction rate will cause the coating or glue to cure prematurely, affecting its leveling and adhesion; an overly slow reaction rate will affect production efficiency and construction convenience. 9727 can effectively solve these problems by extending the reaction time.Improve product quality and performance.

2.1 High-performance coatings

The performance of 9727 is particularly prominent among high-performance coatings. Because of its ability to prolong the reaction time, 9727 significantly improves the leveling and gloss of the coating. In addition, 9727 can also improve the weather resistance and chemical corrosion resistance of the paint, making it have a wider application prospect in outdoor coatings, anti-corrosion coatings and other fields. Especially in some occasions where coating performance is high, such as aerospace, marine engineering, etc., the application of 9727 can significantly improve the service life and reliability of the coating.

2.2 Adhesive

In polyurethane adhesives, the extended time characteristics of 9727 help improve its bond strength and durability. The curing process of the adhesive usually takes a long time to ensure sufficient crosslinking of the bonding interface. 9727 By extending the reaction time, the adhesive can cure under appropriate temperature and humidity conditions, avoiding the phenomenon of unstable bonding caused by excessive reaction. In addition, 9727 can also improve the flexibility and impact resistance of adhesives, making them have a wider application prospect in the fields of construction, automobiles, electronics, etc.

3. Application in elastomers

In the preparation of polyurethane elastomers, the control of reaction time is equally important. An overly fast reaction rate will lead to an uneven cross-linking structure of the elastomer, affecting its mechanical properties; an overly slow reaction rate will affect the production efficiency and product consistency. 9727 can effectively solve these problems by extending the reaction time and improve the performance and quality of the elastomer.

3.1 High-performance elastomer

The performance of 9727 is particularly prominent among high-performance elastomers. Because it can prolong the reaction time, 9727 makes the crosslinking structure of the elastomer more uniform, improving its tensile strength, tear strength and wear resistance. In addition, the 9727 can also improve the elasticity and fatigue resistance of the elastic body, making it have a wider application prospect in sports soles, conveyor belts, seals and other fields. Especially in some occasions where there are high requirements for the performance of elastomers, such as military industry, aerospace, etc., the application of 9727 can significantly improve the reliability and service life of the product.

4. Comparison with other catalysts

To better evaluate the performance of 9727 in practical applications, we can compare it with several common polyurethane catalysts. The following is a comparison of 9727 with organic tin catalysts (such as T-12), organic bismuth catalysts (such as BiCAT 8118) and amine catalysts (such as DABCO) in different application scenarios:

Application Scenario 9727 Organotin Catalyst (T-12) Organic bismuth catalyst (BiCAT 8118) Amines inducedChemical agent (DABCO)
Foaming Excellent General Excellent General
Coatings and Adhesives Excellent General Excellent General
Elastomer Excellent General Excellent General
Environmental and toxicity Low toxicity Higher toxicity Low toxicity Low toxicity
Thermal Stability High Medium High Low
The ability to extend the reaction time Excellent General Excellent General

From the table above, it can be seen that 9727 has excellent performance in application scenarios such as foam molding, coatings, adhesives, and elastomers, especially in extending reaction time and environmental protection. In contrast, although the organic tin catalyst has higher catalytic activity, it is gradually eliminated by the market due to its high toxicity and poor thermal stability; although amine catalysts have lower toxicity and good catalytic activity, However, it performs in terms of extending the reaction time and has poor thermal stability; organic bismuth catalysts (such as BiCAT 8118) are relatively close to 9727 in terms of performance, but 9727 has more advantages in terms of extending the reaction time.

Summary and Outlook

Polyurethane catalyst 9727 has been widely used in the polyurethane industry due to its advantages of efficient catalytic activity, good thermal stability, extended time controllability and low toxicity. Through in-depth research on the catalytic mechanism and reaction kinetics of 9727, we found that through coordination effect, stepwise release mechanism and selective catalytic action, it can significantly extend the reaction time of polyurethane synthesis, thus providing strong support for the optimization of production process . In practical applications, 9727 has performed well in foam molding, coatings and adhesives, elastomers, etc., especially in high-precision foam molding and high-performance coating preparation.

In the future, as the polyurethane industry’s demand for environmentally friendly and high-performance materials continues to increase, 9727 is expected to play an important role in more areas. ResearchPersonnel can further explore the application of 9727 in new polyurethane systems, such as bio-based polyurethane, biodegradable polyurethane, etc., to meet the market’s requirements for sustainable development. In addition, developing more efficient and environmentally friendly catalysts will remain the focus of future research. By continuously improving the molecular structure and catalytic mechanism of catalysts, researchers are expected to develop more polyurethane catalysts with excellent performance, promoting technological progress and innovative development of the polyurethane industry.

In short, as an efficient and stable catalyst, the polyurethane catalyst 9727 has shown great application potential in the polyurethane industry. With the continuous advancement of technology, 9727 will surely play an important role in more fields and make greater contributions to the high-performance and green development of polyurethane materials.

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