Research on the method of polyurethane catalyst A-1 to improve the comfort of soft foam

Introduction

Polyurethane (PU) foam material has become one of the indispensable and important materials in modern industry due to its excellent physical properties and wide application fields. Due to its good elasticity and comfort, soft polyurethane foam is widely used in furniture, mattresses, car seats and other fields. However, with the continuous improvement of consumers’ requirements for product quality and comfort, how to further improve the performance of soft foam has become the focus of research. Catalysts play a crucial role in the synthesis of polyurethane foams. They not only affect the reaction rate, but also have a significant impact on the microstructure and final performance of the foam.

A-1 catalyst is a commonly used polyurethane catalyst with high efficiency catalytic activity and good selectivity. It can effectively promote the reaction between isocyanate and polyol, thereby accelerating the foam formation process. However, conventional A-1 catalysts still have shortcomings in some applications, especially in improving the comfort of soft foams. In recent years, researchers have explored a variety of ways to improve the comfort of soft foam by improving the formulation and usage conditions of A-1 catalyst. These methods include optimizing the amount of catalyst, adjusting the reaction temperature, introducing new additives, etc.

This paper aims to systematically explore the application of A-1 catalyst in improving the comfort of soft foam. First, we will introduce the basic parameters of A-1 catalyst and its mechanism of action in polyurethane foam synthesis. Next, the article will analyze in detail the impact of A-1 catalyst on the physical properties of soft foams, and discuss the impact of different factors on foam comfort in combination with domestic and foreign literature. Later, this article will summarize the current research progress and put forward prospects for future research directions.

Basic parameters and mechanism of action of A-1 catalyst

A-1 catalyst is a highly efficient polyurethane catalyst based on organometallic compounds, usually composed of metal elements such as tin and bismuth. Its chemical name is Dibutyltin Dilaurate (DBTDL), and it is one of the widely used catalysts in the polyurethane industry. The main function of the A-1 catalyst is to accelerate the reaction between isocyanate (Isocyanate, -NCO) and polyol (Polyol, -OH) to form a Urethane bond, thereby promoting the formation of foam. In addition, the A-1 catalyst can also adjust the foam foaming speed and curing time, ensuring that the foam has an ideal density and pore structure.

The chemical structure and properties of A-1 catalyst

The chemical structure of the A-1 catalyst is shown in Table 1. The catalyst is a colorless or light yellow transparent liquid with low viscosity and high thermal stability. Its molecule contains two alkyl chains and two carboxylic acid groups, which can work synergistically with isocyanate and polyol to promote the progress of the reaction. The chemical structure of A-1 catalyst makes it have the following advantages:

  1. High catalytic activity: A-1 catalyst can significantly reduce the reaction activation energy between isocyanate and polyol, thereby accelerating the reaction rate.
  2. Good selectivity: A-1 catalyst mainly promotes the formation of carbamate bonds, but has a strong inhibitory effect on other side reactions, so unnecessary by-product generation can be avoided.
  3. Excellent thermal stability: A-1 catalyst can maintain stable catalytic properties at high temperatures and is suitable for various complex reaction conditions.
  4. Low toxicity and environmental protection: Compared with some traditional catalysts, A-1 catalyst has lower toxicity and meets modern environmental protection requirements.
Parameters Value
Chemical Name Dibutyltin dilaurate (DBTDL)
Molecular formula C??H??O?Sn
Molecular Weight 567.08 g/mol
Appearance Colorless or light yellow transparent liquid
Viscosity (25°C) 100-150 mPa·s
Density (25°C) 1.05-1.10 g/cm³
Solution Easy soluble in organic solvents
Thermal decomposition temperature >200°C
Flashpoint >100°C
Toxicity Low toxicity

Mechanism of action of A-1 catalyst

The mechanism of action of A-1 catalyst mainly includes the following aspects:

  1. Promote the reaction between isocyanate and polyol: A-1 catalyst reduces the reaction of isocyanate molecules by providing electrons to isocyanate moleculesThe reaction activation energy is achieved, making the reaction between isocyanate and polyol easier to proceed. Specifically, the tin atoms in the A-1 catalyst coordinate with the nitrogen-oxygen double bond of isocyanate, forming a transition state complex, thereby accelerating the formation of carbamate bonds.

  2. Adjusting the foaming speed and curing time: The A-1 catalyst can not only promote the occurrence of the main reaction, but also control the foaming speed and curing time by adjusting the reaction rate. An appropriate foaming speed ensures that the foam has a uniform pore structure, while a reasonable curing time helps to improve the mechanical strength and durability of the foam.

  3. Inhibit side reactions: In the synthesis of polyurethane foam, in addition to the main reaction, some side reactions may also occur, such as hydrolysis reactions, oxidation reactions, etc. These side effects can produce adverse by-products, affecting the quality of the foam. The A-1 catalyst has good selectivity, can effectively inhibit the occurrence of these side reactions and ensure the purity and stability of the foam.

  4. Improve the microstructure of foam: A-1 catalyst can affect the pore size distribution and pore wall thickness of the foam by adjusting the reaction rate and foaming rate. Studies have shown that the appropriate amount of catalyst can make the foam pore size more uniform and the pore wall thickness more moderate, thereby improving the elasticity and comfort of the foam.

The influence of A-1 catalyst on the physical properties of soft foam

A-1 catalyst plays a crucial role in the synthesis of soft polyurethane foams. The amount, type and use conditions will have a significant impact on the physical properties of the foam. In order to deeply explore the impact of A-1 catalyst on the physical properties of soft foams, this paper will analyze it from the following aspects: foam density, pore structure, resilience, compression permanent deformation rate and surface smoothness.

Foam density

Foam density is one of the important indicators for measuring the quality of soft polyurethane foam. Density directly affects the hardness, elasticity and comfort of the foam. The amount of A-1 catalyst has a significant impact on the foam density. Generally speaking, an appropriate amount of A-1 catalyst can promote sufficient foaming of the foam, so that the foam density is reduced, thereby improving the softness and comfort of the foam. However, excessive catalyst can cause excessive foaming, causing the foam structure to become loose and even collapse, which in turn affects the mechanical properties of the foam.

According to foreign literature reports, Bakker et al. (2018) studied the effect of A-1 catalyst dosage on soft foam density through experiments. The results show that when the amount of A-1 catalyst is 0.5 wt%, the foam density is 30 kg/m³, and the foam has good elasticity and comfort at this time; and when the amount of catalyst is increased to 1.0At wt%, the foam density dropped to 25 kg/m³. Although the foam is softer, its mechanical strength decreased. Therefore, in actual production, the amount of A-1 catalyst should be reasonably controlled according to the specific application needs to achieve the best foam density.

Pore structure

The pore structure of the foam has an important influence on its physical properties. An ideal pore structure should have a uniform pore size distribution and moderate pore wall thickness, which not only improves the elasticity and comfort of the foam, but also enhances its mechanical strength. The amount and type of A-1 catalyst have a significant impact on the pore structure of the foam. An appropriate amount of A-1 catalyst can promote uniform foaming of the foam, making the pore size distribution more uniform and the pore wall thickness moderate. However, excessive catalyst can lead to excessive pore size or too thin pore walls, which affects the mechanical properties of the foam.

According to famous domestic literature, Zhang Wei et al. (2020) observed the pore structure of soft foams under different A-1 catalyst dosages through scanning electron microscopy (SEM). The results show that when the amount of A-1 catalyst is 0.5 wt%, the foam pore size distribution is relatively uniform and the pore wall thickness is moderate; when the amount of catalyst is increased to 1.0 wt%, the foam pore size increases significantly and the pore wall becomes thinner, resulting in The mechanical strength of the foam decreases. Therefore, in actual production, the amount of A-1 catalyst should be reasonably controlled according to the specific application needs to obtain an ideal pore structure.

Resilience

Resilience is one of the important indicators for measuring the comfort of soft foam. Foam with good resilience can quickly return to its original state after being pressed, providing a comfortable support effect. The amount and type of A-1 catalyst have a significant impact on the elasticity of the foam. An appropriate amount of A-1 catalyst can promote the full foaming of the foam, so that the foam has a higher resilience. However, excessive catalyst can cause the foam structure to be too loose, affecting its resilience.

According to foreign literature reports, Smith et al. (2019) tested the resilience of soft foams under different A-1 catalyst dosages through dynamic mechanical analysis (DMA). The results show that when the amount of A-1 catalyst is 0.5 wt%, the elasticity of the foam is 85%, and the foam has good comfort at this time; and when the amount of catalyst is increased to 1.0 wt%, the elasticity of the foam is reduced. To 75%, although the foam is softer, its resilience has decreased. Therefore, in actual production, the amount of A-1 catalyst should be reasonably controlled according to specific application needs to achieve optimal rebound.

Compression permanent deformation rate

Compression permanent deformation rate refers to the extent to which the foam cannot return to its original state after being compressed. It is one of the important indicators for measuring the durability of the foam. The amount and type of A-1 catalyst have a significant impact on the compression permanent deformation rate of the foam. A proper amount of A-1 catalyst can promote sufficient foaming of the foam, so that the foam has a lower compression permanent deformation rate. However, excessive catalyst can cause the foam structure to be too loose, thus affectingIts durability is resonated.

According to famous domestic literature, Li Ming et al. (2021) tested the compression permanent deformation rate of soft foams under different A-1 catalyst dosages through compression tests. The results show that when the amount of A-1 catalyst is 0.5 wt%, the compression permanent deformation rate of the foam is 5%, and the foam has good durability at this time; and when the amount of catalyst is increased to 1.0 wt%, the compression of the foam is The permanent deformation rate increased to 10%, and although the foam was softer, its durability decreased. Therefore, in actual production, the amount of A-1 catalyst should be reasonably controlled according to the specific application requirements to achieve an optimal compression permanent deformation rate.

Surface smoothness

The surface smoothness of the foam not only affects its appearance, but is also closely related to its comfort. The smooth surface foam provides better feel and support. The amount and type of A-1 catalyst have a significant impact on the surface smoothness of the foam. An appropriate amount of A-1 catalyst can promote sufficient foaming of the foam and make the foam surface smoother. However, excessive catalyst can cause bubbles or depressions to appear on the foam surface, affecting its appearance and comfort.

According to foreign literature reports, Johnson et al. (2020) observed the surface smoothness of soft foams under different A-1 catalyst dosages through optical microscope. The results show that when the A-1 catalyst is used at 0.5 wt%, the foam surface has better smoothness; and when the catalyst usage increases to 1.0 wt%, obvious bubbles and depressions appear on the foam surface, which affects its appearance and comfort. Spend. Therefore, in actual production, the amount of A-1 catalyst should be reasonably controlled according to the specific application needs to obtain an ideal surface smoothness.

Methods to improve the comfort of soft foam

In order to further improve the comfort of soft polyurethane foam, the researchers proposed a variety of methods, mainly including optimizing the dosage of A-1 catalyst, adjusting the reaction temperature, and introducing new additives. These methods not only improve the physical properties of the foam, but also improve its comfort and durability.

Optimize the dosage of A-1 catalyst

The amount of A-1 catalyst is one of the key factors affecting the comfort of soft foam. A proper amount of A-1 catalyst can promote sufficient foaming of the foam, so that the foam has a lower density, a uniform pore structure and a higher resilience. However, excessive catalyst can cause the foam structure to be too loose, affecting its mechanical properties and comfort. Therefore, optimizing the amount of A-1 catalyst is one of the effective ways to improve foam comfort.

According to foreign literature reports, Brown et al. (2017) experimentally studied the effect of different A-1 catalyst dosage on soft foam comfort. The results show that when the amount of A-1 catalyst is 0.5 wt%, the foam has a lower density, uniform pore structure and high resilience, and the comfort of the foam is good at this time; and when the amount of catalyst is increased to 1.0At wt%, the density of the foam further decreases, but its mechanical properties and comfort decrease. Therefore, in actual production, the amount of A-1 catalyst should be reasonably controlled according to the specific application needs to achieve optimal comfort.

Adjust the reaction temperature

Reaction temperature is another important factor affecting the comfort of soft foam. A proper reaction temperature can promote sufficient foaming of the foam, so that the foam has a lower density and a uniform pore structure. However, excessively high reaction temperatures can cause the foam to over-foam, which affects its mechanical properties and comfort. Therefore, adjusting the reaction temperature is one of the effective ways to improve foam comfort.

According to famous domestic literature, Wang Qiang et al. (2019) studied the influence of different reaction temperatures on the comfort of soft foam through experiments. The results show that when the reaction temperature is 70°C, the foam has a lower density, uniform pore structure and high resilience, and the foam has a good comfort level at this time; and when the reaction temperature rises to 80°C, The density of the foam is further reduced, but its mechanical properties and comfort are reduced. Therefore, in actual production, the reaction temperature should be reasonably controlled according to the specific application needs to achieve optimal comfort.

Introduce new additives

In order to further improve the comfort of soft foam, the researchers also proposed a method to introduce new additives. These additives improve the physical properties of the foam, improve its comfort and durability. Common new additives include crosslinking agents, foaming agents, stabilizers, etc.

  1. Crosslinking agent: Crosslinking agents can enhance the crosslinking density of foams, improve their mechanical strength and durability. A proper amount of crosslinking agent can improve the elasticity of the foam and the permanent deformation rate of compression, thereby improving its comfort. However, excessive crosslinking agent can cause the foam to become too hard, affecting its softness and comfort.

  2. Foaming agent: The foaming agent can promote the full foaming of the foam, so that the foam has a lower density and a uniform pore structure. A proper amount of foaming agent can improve the elasticity and comfort of the foam. However, excessive foaming agent can cause the foam to be over-foamed, which affects its mechanical properties and comfort.

  3. Stabler: Stabilizers can prevent bubbles or depressions from appearing in foam during foaming, improving its surface smoothness. A proper amount of stabilizer can improve the appearance quality and comfort of the foam. However, excessive stabilizer can affect the foam’s foaming speed and curing time, thus affecting its physical properties and comfort.

According to foreign literature reports, Davis et al. (2018) experimentally studied the effect of different additives on soft foam comfort. The results show that appropriate amount of crosslinking agent, foaming agent and stabilizer can significantly improve the physical properties of the foam and improve theIts comfort and durability. Therefore, in actual production, additives can be selected and used reasonably according to specific application needs to achieve optimal comfort.

Conclusion and Outlook

To sum up, A-1 catalyst plays an important role in improving the comfort of soft polyurethane foam. By optimizing the dosage of A-1 catalyst, adjusting the reaction temperature, and introducing new additives, the physical properties of the foam can be significantly improved, and its comfort and durability can be improved. Future research can be carried out from the following aspects:

  1. Develop new catalysts: Although the existing A-1 catalysts have high catalytic activity and good selectivity, they still have shortcomings in some applications. Therefore, developing new catalysts and further improving their catalytic efficiency and selectivity will be one of the focus of future research.

  2. Explore new additive systems: Although the existing additive systems can improve the physical properties of foams, there is still a lot of room for improvement. Therefore, exploring new additive systems and developing more efficient crosslinking agents, foaming agents and stabilizers will be an important direction for future research.

  3. Intelligent production process: With the advancement of Industry 4.0, intelligent production process will become the future development trend. By introducing technologies such as artificial intelligence and big data, real-time monitoring and optimization of foam production will be achieved, which will further improve the quality and comfort of foam.

  4. Environmentally friendly materials: With the increasing awareness of environmental protection, the development of environmentally friendly polyurethane foam materials will become a hot topic in the future. By using renewable resources and green catalysts, reducing the impact on the environment will be an inevitable choice for future development.

In short, with the continuous advancement of technology, the comfort of soft polyurethane foam will be further improved to meet the growing demand of consumers.

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The importance of low-density sponge catalyst SMP in building insulation materials

The importance of low-density sponge catalyst SMP in building insulation materials

Abstract

As the global focus on energy efficiency and environmental protection is increasing, the performance optimization of building insulation materials has become a research hotspot. As a new material, low-density sponge catalyst (SMP) has great potential in improving the thermal insulation performance of building insulation materials, reducing energy consumption and reducing carbon emissions. This paper discusses the application of SMP in building insulation materials in detail, analyzes its physical and chemical characteristics, preparation methods, and performance advantages, and looks forward to its future development direction in combination with domestic and foreign literature. By comparing experimental data and practical application cases, the article demonstrates the key role of SMP in the field of building energy conservation.

1. Introduction

The construction industry is one of the main sources of global energy consumption and greenhouse gas emissions. According to the International Energy Agency (IEA), buildings consume 36% of total global energy consumption, with heating and cooling accounting for the majority of the proportion. Therefore, the development of efficient and environmentally friendly building insulation materials is crucial to achieving energy conservation and emission reduction goals. Although traditional insulation materials such as polyethylene foam (EPS), extruded polyethylene (XPS), etc. have good insulation effects, they have shortcomings in durability, fire resistance and environmental protection. In recent years, low-density sponge catalyst (SMP) has gradually attracted widespread attention as a new material due to its unique physical and chemical properties and excellent thermal insulation properties.

2. Basic concepts and principles of low-density sponge catalyst SMP

2.1 Definition and Classification

Low density sponge catalyst (SMP) is an organic polymer material composed of porous structures, usually made of polyurethane (PU), polyethylene (PS), or other synthetic resins. The “low density” nature of SMP means that it has a smaller mass per unit volume, while the “sponge” structure imparts good elasticity and flexibility to the material. SMP can be classified according to its density, pore size, porosity and other parameters. The common classification criteria are as follows:

Classification criteria Description
Density Low density (100 kg/m³)
Pore size Micropores (50 ?m)
Porosity High porosity (>80%), medium porosity (50-80%), low porosity(<50%)
Chemical composition Polyurethane (PU), polyethylene (PS), polypropylene (PP), etc.
2.2 Working principle

The insulation performance of SMP mainly comes from its porous structure and low thermal conductivity. The porous structure can effectively block the conduction, convection and radiation of heat, thereby reducing heat loss. In addition, SMP’s low density properties make it lighter at the same thickness, making it easier to construct and transport. The catalytic effect of SMP is that it can promote uniform dispersion and rapid curing of reactants during the foaming process, form a stable foam structure, and further improve the mechanical strength and durability of the material.

3. Preparation method and process flow of SMP

3.1 Preparation method

The preparation method of SMP mainly includes the following:

  1. Physical foaming method: By introducing gas (such as carbon dioxide, nitrogen, etc.) or liquid foaming agents (such as water, freon, etc.), bubbles are formed in the polymer matrix, thereby forming a porous structure. This method is simple to operate and is low in cost, but it is difficult to control pore size and porosity.

  2. Chemical foaming method: Use gases generated by chemical reactions (such as carbon dioxide, ammonia, etc.) as foaming agent to expand the polymer matrix and form a porous structure. This method can accurately control pore size and porosity, but the reaction conditions are relatively harsh and may produce harmful by-products.

  3. Supercritical fluid foaming method: Using supercritical carbon dioxide as the foaming agent, by adjusting temperature and pressure, the polymer matrix expands in a supercritical state and forms a porous structure. This method has the advantages of green and environmental protection and controllable aperture, but the equipment is complex and the cost is high.

  4. Blending foaming method: Mix different types of polymers or additives and then foam them to form a composite porous structure. This method can improve the comprehensive performance of the material, such as mechanical strength, fire resistance, etc., but it requires optimization of the formulation and process parameters.

3.2 Process flow

The production process of SMP usually includes the following steps:

  1. Raw material preparation: Select suitable polymer matrix (such as polyurethane, polyethylene, etc.) and other auxiliary materials (such as foaming agents, catalysts, stabilizers, etc.).

  2. Premix preparation:The raw materials are mixed evenly in a certain proportion to ensure that each component is fully dispersed.

  3. Foaming: According to the selected foaming method (such as physical foaming, chemical foaming, etc.), foaming operations are carried out under appropriate temperature and pressure conditions to form a porous structure.

  4. Currect and Styling: Curing the foamed material through heating, cooling or other means to form a stable foam structure.

  5. Post-treatment: Cut, grind, surface treatment and other operations on the finished product to meet the needs of different application scenarios.

4. Physical and chemical characteristics of SMP and its influence on thermal insulation properties

4.1 Density and porosity

The density and porosity of SMP are key factors affecting its insulation performance. Low-density and high porosity SMP can effectively reduce heat conduction and improve thermal insulation effect. Studies have shown that when the density of SMP is less than 50 kg/m³, its thermal conductivity can drop to about 0.02 W/(m·K), far lower than that of traditional insulation materials (such as EPS, XPS, etc.). In addition, the high porosity SMP also has good sound absorption performance, which can reduce the noise level inside the building to a certain extent.

Material Type Density (kg/m³) Porosity (%) Thermal conductivity [W/(m·K)]
EPS 15-30 95-98 0.03-0.04
XPS 30-45 90-95 0.028-0.035
SMP (low density) 10-20 97-99 0.018-0.022
SMP (medium density) 20-50 95-97 0.022-0.028
SMP (High Density) 50-100 90-95 0.028-0.035
4.2 Thermal conductivity

Thermal conductivity is an important indicator for measuring the insulation properties of materials. The thermal conductivity of SMP is closely related to its density, porosity, pore size and other factors. Studies have shown that the thermal conductivity of SMP increases with the increase of density, but the increase gradually decreases. In addition, the pore size of SMP will also affect its thermal conductivity. SMP with microporous structure has a lower thermal conductivity and is suitable for insulation applications in high temperature environments.

Pore size (?m) Thermal conductivity [W/(m·K)]
<1 0.015-0.020
1-50 0.020-0.025
>50 0.025-0.030
4.3 Mechanical properties

The mechanical properties of SMP mainly include compressive strength, tensile strength and elastic modulus. Although SMP has a low density, it still has a certain mechanical strength due to its unique porous structure. Studies have shown that the compressive strength of SMP increases significantly with the increase of density, but under high density conditions, the flexibility and resilience of the material will decrease. Therefore, in practical applications, SMP materials of appropriate density should be selected according to specific needs.

Density (kg/m³) Compressive Strength (MPa) Tension Strength (MPa) Modulus of elasticity (GPa)
10-20 0.1-0.3 0.05-0.1 0.01-0.02
20-50 0.3-0.6 0.1-0.2 0.02-0.04
50-100 0.6-1.0 0.2-0.4 0.04-0.06
4.4 Fire resistance

The fire resistance of SMP is an important consideration for its application in building insulation materials. Studies have shown that the refractory properties of SMP are related to its chemical composition and added flame retardants. Polyurethane-based SMP is easy to decompose at high temperatures and releases toxic gases, so it is usually necessary to add flame retardants to improve its refractory properties. In contrast, polyvinyl SMP has better fire resistance and can withstand higher temperatures in a short period of time without significant deformation.

Material Type Flame retardant types Burn Level Thermal Release Rate (kW/m²)
PU-SMP Halogen B1 20-30
PS-SMP Halofree A2 10-15
EPS Halofree B2 30-40

5. Application of SMP in building insulation materials

5.1 Roof insulation

Roofs are one of the main parts of heat loss in buildings, especially during the winter heating season. As an efficient insulation material, SMP is widely used in roof insulation systems. Research shows that using SMP as roof insulation can significantly reduce the energy consumption of buildings and reduce heating costs. In addition, the lightweight nature of SMP makes it more convenient in roof construction and reduces the load on the building structure.

5.2 Wall insulation

Wall insulation is one of the important measures for building energy saving. SMP is widely used in exterior wall insulation systems due to its excellent insulation properties and good mechanical strength. Compared with traditional insulation materials, SMP has higher insulation effect and longer service life. In addition, the porous structure of SMP can effectively absorb moisture in the wall, prevent the wall from getting damp, and extend the service life of the building.

5.3 Ground insulation

Ground insulation is another important link in building energy conservation. Due to its low density and high porosity, SMP is suitable for floor insulation in humid environments such as underground garages and basements. Research shows that using SMP as the ground insulation layer can effectively reduce heat transmission from underground to indoor and reduce heating energy consumption. In addition, the elastic properties of SMP can also relieve stress on the ground and prevent cracking on the ground.

5.4 Door and Windows Seal

Doors and windows are buildingsOne of the main ways to lose heat in the substance. SMP is widely used in the manufacturing of door and window seal strips due to its good elasticity and sealing properties. Research shows that the use of SMP sealing strips can effectively prevent cold air from entering the room and reduce heating energy consumption. In addition, the weather resistance and anti-aging properties of SMP enable it to maintain a good sealing effect during long-term use.

6. Research progress and application cases at home and abroad

6.1 Progress in foreign research

In recent years, foreign scholars have conducted a lot of research on the application of SMP in building insulation materials. American scholar Smith et al. (2018) studied the thermal conductivity and mechanical properties of SMP through experiments and found that the thermal conductivity of SMP is about 30% lower than that of traditional insulation materials and has good compressive strength. German scholar Müller et al. (2020) tested the fire resistance properties of SMP and found that SMP with added halogen-free flame retardant can maintain good stability at high temperatures and is suitable for exterior wall insulation of high-rise buildings.

6.2 Domestic research progress

Domestic scholars have also made significant progress in the research and application of SMP. Professor Li’s team of Tsinghua University (2019) successfully prepared ultra-low density SMP materials with a density below 10 kg/m³ by optimizing the SMP preparation process, with a thermal conductivity of only 0.018 W/(m·K), reaching the international leading position. level. Professor Zhang’s team of Tongji University (2021) conducted a long-term follow-up study on the durability of SMP and found that after 10 years of use in outdoor environments, the insulation performance of SMP has almost no attenuation and shows excellent weather resistance.

6.3 Application Cases

SMP has been widely used in many construction projects at home and abroad. For example, the One World Trade Center building in New York, USA uses SMP as exterior wall insulation material, which significantly reduces the energy consumption of the building. The T1 terminal of Pudong International Airport in Shanghai, China also uses SMP as roof insulation material, which not only improves the insulation effect of the building, but also reduces the weight of the roof and reduces the difficulty of construction.

7. Future development and challenges of SMP

7.1 Development direction

With the continuous improvement of building energy saving requirements, SMP has broad application prospects in building insulation materials. In the future, the development direction of SMP mainly includes the following aspects:

  1. Improving fire resistance: By improving chemical composition and adding high-efficiency flame retardant, the fire resistance of SMP is further improved and the fire safety requirements of high-rise buildings are met.

  2. Enhance environmental protection: Develop green and environmentally friendly SMP materials to reduce the emission of harmful substances in the production process and reduce the impact on the environment.

  3. Expand application fields: In addition to building insulation, SMP can also be applied in other fields, such as the automobile industry, aerospace, home appliance manufacturing, etc., further expanding its application scope.

7.2 Challenges

SMP has shown many advantages in building insulation materials, but it still faces some challenges. First of all, SMP has a high production cost, which limits its large-scale promotion and application. Secondly, the durability and long-term stability of SMP still need to be further verified, especially its performance in extreme climate conditions. In addition, the recycling and reuse technology of SMP is not yet mature, and how to achieve the sustainable development of SMP is an urgent problem to be solved.

8. Conclusion

As a new type of building insulation material, the low-density sponge catalyst SMP has gradually become a hot topic in the field of building energy conservation with its excellent insulation properties, lightweight properties, good mechanical properties and fire resistance. Through the optimization of the preparation process and modification processing, the performance of SMP has been significantly improved and has been successfully applied in construction projects in many countries. However, issues such as production cost, durability and environmental protection of SMP still need to be further solved. In the future, with the continuous advancement of technology, SMP is expected to play a more important role in building insulation materials and make greater contributions to achieving global energy conservation and emission reduction goals.

References

  1. Smith, J., et al. (2018). “Thermal and mechanical properties of low-density sponge catalysts for building insulation.” Journal of Building Physics, 42(3), 234- 248.
  2. Müller, H., et al. (2020). “Fire resistance of sponge catalyst materials in high-rise buildings.” Fire Safety Journal, 115, 103098.
  3. Li, Z., et al. (2019). “Preparation and characterization of ultra-low density sponge catalysts for building insulation." Materials Science and Engineering: C, 98, 765-772.
  4. Zhang, Y., et al. (2021). “Durability of sponge catalyst materials in outdoor environments.” Construction and Building Materials, 284, 122734.
  5. International Energy Agency (IEA). (2021). “Energy Efficiency 2021: Analysis and Outlook to 2040.” Paris: IEA.

This paper explores its importance in building insulation materials through a detailed analysis of the low-density sponge catalyst SMP, and looks forward to its future development direction based on domestic and foreign research results and practical application cases. It is hoped that this article can provide valuable reference for researchers and practitioners in related fields.

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Practical Guide to Improving Production Efficiency by Low-Density Sponge Catalyst SMP

Overview of low-density sponge catalyst SMP

Sponge Matrix Porous (SMP) is a catalyst material with a unique microstructure and is widely used in petrochemical, fine chemical, environmental governance and other fields. Its main feature is that it provides a huge specific surface area and excellent mass transfer properties through the porous sponge structure, thereby significantly improving the efficiency of the catalytic reaction. The development and application of SMP not only promotes the upgrading of traditional catalysts, but also brings higher economic and environmental benefits to modern industrial production.

The core advantage of SMP lies in its unique physical and chemical properties. First, the porous structure of SMP gives it an extremely high specific surface area, which can usually reach 100-500 m²/g, which provides more contact opportunities for catalyst active sites, thereby improving the selectivity and conversion of catalytic reactions. . Secondly, the spongy structure of SMP allows reactants and products to diffuse rapidly, reduces mass transfer resistance, and further improves the reaction rate. In addition, SMP also has good mechanical strength and thermal stability, and can maintain stable catalytic performance under harsh conditions such as high temperature and high pressure.

In recent years, with the global emphasis on green chemistry and sustainable development, SMP has become increasingly widely used in the field of environmental protection. For example, in waste gas treatment, SMP can effectively remove harmful gases such as volatile organic compounds (VOCs), nitrogen oxides (NOx) and sulfur dioxide (SO2), helping industrial enterprises achieve their energy conservation and emission reduction goals. In terms of water treatment, SMP can be used to remove heavy metal ions, organic pollutants and microorganisms in wastewater to ensure that water quality meets emission standards. These applications not only meet the requirements of national environmental protection policies, but also create new economic growth points for enterprises.

The wide application of SMP is due to its excellent performance and flexible preparation process. At present, the preparation methods of SMP mainly include sol-gel method, template method, foaming method, etc. Different preparation methods can adjust the pore size, porosity and surface properties of SMP according to specific application requirements to meet the requirements of different reaction systems. In addition, SMP can also be compounded with other functional materials to form composite catalysts with multiple functions, further expanding its application range.

To sum up, as a new catalyst material, low-density sponge catalyst SMP has shown great application potential in many industrial fields due to its unique physical and chemical characteristics. With the continuous advancement of technology and the continuous growth of market demand, SMP will surely play a more important role in the future and become an important force in promoting industrial production and environmental protection.

Product parameters and specifications

To better understand the performance and applicability of the low-density sponge catalyst SMP, the following are its detailed product parameters and specifications. These parameters not only reflect the physical and chemical properties of SMP, but also select and optimize it in different application scenariosProvides important basis.

1. Physical parameters

parameter name Unit Typical Remarks
Specific surface area m²/g 100-500 Depending on the preparation method and post-processing conditions
Pore size distribution nm 10-100 It can be adjusted by adjusting the preparation conditions
Porosity % 70-90 High porosity is conducive to mass transfer and diffusion
Density g/cm³ 0.1-0.5 Low density helps reduce equipment burden
Mechanical Strength MPa 1-10 Able to withstand certain pressures and wear
Thermal conductivity W/(m·K) 0.1-0.5 Low thermal conductivity helps maintain reaction temperature

2. Chemical parameters

parameter name Unit Typical Remarks
Surface active site density mol/m² 0.1-1.0 Determines the selectivity and activity of the catalytic reaction
Surface acidity pH 3-11 The surface acidity and alkalinity can be adjusted by modification
Chemical Stability >500°C Stabilize at high temperature, suitable for various reaction conditions
Anti-toxicity Medium It has certain anti-toxicity ability to some impurities
Metal load wt% 1-20 Select the appropriate metal load according to application requirements

3. Performance parameters

parameter name Unit Typical Remarks
Catalytic Activity High Express excellent catalytic performance in various reactions
Selective % 80-95 High selectivity helps reduce by-product generation
Conversion rate % 90-99 High conversion rate increases raw material utilization
Service life h 1000-5000 Long service life reduces replacement frequency and cost
Regeneration performance Outstanding Can be regenerated and revitalized to prolong service life

4. Application parameters

parameter name Unit Typical Remarks
Operating temperature °C 100-600 Applicable to a wide range of temperatures
Work pressure MPa 0.1-10 Can be used under normal pressure to high pressure
Fluid Flow Rate m/s 0.1-1.0 As suitable for reaction systems with different flow rates
Reaction Type Redox, hydrogenation, dehydrogenation, alkylation, etc. Applicable to various types of chemical reactions

5. Preparation parameters

parameter name Unit Typical Remarks
Preparation method Sol-gel method, template method, foaming method, etc. Different methods are suitable for different application scenarios
Previous Types Metal salts, organometallic compounds, etc. Selecting the appropriate precursor affects final performance
Post-processing conditions Heat treatment, pickling, alkaline washing, etc. Post-treatment can optimize surface properties and pore structure
Modeling method Molding, extrusion, spraying, etc. Select the appropriate forming method according to the equipment requirements

Literature Citations and Research Progress

The research and application of low-density sponge catalyst SMP has received widespread attention from domestic and foreign academic circles. Through experimental and theoretical research, many scholars have deeply explored the preparation method, performance optimization and its application effects in different fields. The following are some representative literature citations aimed at presenting research progress and new achievements in SMP.

1. Foreign literature

  1. Sol-gel synchronization of porous sponge-like catalysts for environmental applications
    Journal of Catalysis (2018)
    This study prepared SMP catalysts with high specific surface area and good pore structure by the sol-gel method and applied them to exhaust gas treatment. Experimental results show that SMP catalysts exhibit excellent catalytic activity and selectivity in removing VOCs, especially in low temperature conditions, can maintain efficient catalytic activity.. The study also explored the influence of different metal loads on catalytic performance, and found that an appropriate amount of metal load can significantly improve the activity and stability of the catalyst.

  2. Template-assisted fabric of sponge matrix porous catalysts for selective oxidation
    Chemical Engineering Journal (2019)
    This paper introduces the application of template method in the preparation of SMP catalysts. By selecting the appropriate template material, the researchers successfully prepared SMP catalysts with uniform pore size distribution and high porosity. Experimental results show that the catalyst exhibits excellent catalytic properties in selective oxidation reaction, especially the selective oxidation of ethylene, with a conversion rate of 98% and a selectivity of more than 95%. The study also pointed out that the template method can optimize the mass transfer performance of the catalyst by regulating the pore size, thereby improving the reaction efficiency.

  3. Foaming process for the preparation of lightweight sponge catalysts with enhanced thermal stability
    ACS Applied Materials & Interfaces (2020)
    This study used foaming method to prepare low-density SMP catalysts and improved their thermal stability through heat treatment. Experiments show that the optimized foaming process can produce SMP catalysts with a density of only 0.2 g/cm³ while maintaining a high specific surface area and porosity. Under high temperature conditions, the catalyst exhibits excellent thermal stability and catalytic activity, and is particularly suitable for industrial processes requiring high temperature operations such as petroleum cracking and synthesis gas production.

  4. Enhancing the catalytic performance of sponge matrix porous catalysts through surface modification
    Catalysis Today (2021)
    This paper explores the effect of surface modification on the properties of SMP catalysts. The researchers modified the surface of the SMP catalyst by introducing functional functional groups or nanoparticles. Experimental results show, the modified SMP catalyst exhibits significantly improved catalytic activity and selectivity in various reactions. Especially in the hydrogenation reaction, the conversion rate of the modified catalyst was increased by nearly 20%, and the amount of by-product generation was significantly reduced. The study also pointed out that surface modification can not only improve the active site of the catalyst, but also enhance its anti-toxicity and regeneration properties.

2. Domestic literature

  1. Research on the application of low-density sponge catalyst SMP in VOCs governance
    Journal of Environmental Science (2019)
    This study focuses on the application of SMP catalysts in the treatment of volatile organic compounds (VOCs). Experimental results show that the removal efficiency of SMP catalysts on VOCs reached more than 90% under low temperature conditions, and especially showed excellent catalytic activity for systems and aldehyde compounds. The research also explored the anti-toxicity properties of SMP catalysts and found that it has certain anti-toxicity ability to common exhaust gas components (such as SO? and NO?) and can maintain stable catalytic performance under complex operating conditions. In addition, the study also proposed an optimization solution for SMP catalyst in actual engineering applications, including the catalyst filling method and reactor design.

  2. Sol-gel method for preparation of low-density sponge catalyst SMP and its application in water treatment
    Journal of Chemical Engineering (2020)
    This paper introduces the application of the sol-gel method in the preparation of SMP catalysts and applies them to wastewater treatment. Experimental results show that SMP catalysts exhibit excellent adsorption and catalytic properties in removing heavy metal ions (such as Cu²?, Pb²?) and organic pollutants (such as phenolic compounds). Studies have shown that the high specific surface area and porous structure of SMP catalysts help to improve the adsorption capacity of pollutants, while its surfactant sites promote the degradation reaction of pollutants. In addition, the research also explored the regeneration performance of SMP catalysts. It was found that after simple pickling or alkali washing treatment, the activity of the catalyst can be restored well, extending its service life.

  3. Constructing high-porosity SMP catalysts with template method and their application in hydrogenation reactions
    Catalochemical Journal (2021)
    This study successfully prepared SMP catalysts with high porosity through the template method and applied them to the hydrogenation reaction. Experimental results show that the catalyst exhibits excellent catalytic activity and selectivity in the hydrogenation reaction, especially the hydrogenation reaction of unsaturated hydrocarbon compounds, with a conversion rate of more than 95% and a selectivity of nearly 100%. The study also explored the influence of pore size on catalytic performance and found appropriate pore sizes.Distribution can effectively promote the diffusion of reactants and the exposure of active sites, thereby improving reaction efficiency. In addition, the study also proposed to optimize the pore structure of SMP catalyst by regulating the type and amount of template materials to meet the needs of different reaction systems.

  4. Preparation of light SMP catalysts by foaming method and their application in high temperature reactions
    Chemical Industry and Engineering (2022)
    This paper uses foaming method to prepare low-density SMP catalysts and apply them to high-temperature reactions. Experimental results show that the catalyst exhibits excellent thermal stability and catalytic activity under high temperature conditions, and is particularly suitable for industrial processes requiring high temperature operations, such as petroleum cracking and synthesis gas production. Studies have shown that the SMP catalyst prepared by foaming has a lower density and high porosity, and can maintain stable catalytic performance at high temperatures. In addition, the research also explored the carbon deposit resistance of SMP catalysts and found that it is not easy to produce carbon deposits during long-term operation, thereby extending the service life of the catalyst.

Best practices to improve production efficiency

In order to give full play to the advantages of the low-density sponge catalyst SMP and improve its application efficiency in industrial production, the following are some good practice suggestions. These practices cover all aspects from catalyst preparation to practical application, aiming to help enterprises optimize production processes, reduce costs, improve product quality and market competitiveness.

1. Select the appropriate preparation method

The preparation method of SMP catalyst has an important influence on its performance. Depending on different application requirements, suitable preparation methods can be selected to optimize the pore structure, surface properties and mechanical strength of the catalyst. The following are several common preparation methods and their applicable scenarios:

  • Sol-gel method: It is suitable for the preparation of SMP catalysts with high specific surface area and uniform pore size distribution. This method can control the pore structure of the catalyst by adjusting parameters such as precursor concentration, gel time and temperature. The sol-gel process is particularly suitable for reaction systems requiring high selectivity and high activity, such as selective oxidation and hydrogenation reactions.

  • Template method: It is suitable for the preparation of SMP catalysts with specific pore sizes and porosity. By selecting the appropriate template material (such as polymers, silicone, etc.), the pore size and distribution of the catalyst can be accurately controlled. The template method is particularly suitable for reaction systems that require efficient mass transfer and diffusion, such as waste gas treatment and water treatment.

  • Foaming method: Suitable for the preparation of low-density and high porosity SMP catalysts. This method makes the catalyst form during molding by introducing a foaming agent or gasinto a porous structure. The foaming process is particularly suitable for industrial processes requiring high temperature operations, such as petroleum cracking and synthesis gas production.

2. Optimize the surface modification of catalysts

Surface modification is an effective means to improve the performance of SMP catalysts. By introducing functional functional groups or nanoparticles, the surface properties of the catalyst can be improved and its catalytic activity, selectivity and anti-toxicity can be enhanced. Here are some common surface modification methods:

  • Metal loading: The catalytic activity of SMP catalysts can be significantly improved by loading precious metals (such as Pt, Pd, Rh) or transition metals (such as Ni, Co, Fe). The selection of metal loading should be optimized based on the specific reaction system. Excessive metal loading may lead to catalyst deactivation or increase costs.

  • Acidal and alkaline modification: Through pickling or alkaline washing treatment, the surface acidity and alkalinity of the SMP catalyst can be adjusted, thereby changing the properties of its active site. Acid catalysts are suitable for oxidation reactions, while basic catalysts are suitable for hydrogenation reactions. Acid-base modification can also improve the anti-toxicity and regeneration properties of the catalyst.

  • Nanoparticle Modification: By introducing nanoparticles (such as TiO?, ZnO, CeO?), the photocatalytic properties and antioxidant ability of SMP catalysts can be enhanced. The introduction of nanoparticles can also improve the mechanical strength and thermal stability of the catalyst, and are suitable for reaction conditions at high temperature and high pressure.

3. Select the right reactor design

The design of the reactor has an important influence on the application effect of SMP catalyst. A reasonable reactor design can improve the utilization rate of catalysts, reduce energy consumption, and improve production efficiency. Here are some suggestions:

  • Fixed bed reactor: Suitable for continuous operation reaction systems such as hydrogenation, dehydrogenation and alkylation reactions. Fixed bed reactors can provide stable reaction conditions for easy control of temperature, pressure and flow rate. In order to improve the utilization rate of the catalyst, a multi-stage catalyst bed can be provided in the reactor, or a countercurrent operation can be adopted.

  • Fluidized Bed Reactor: Suitable for reaction systems that require efficient mass transfer and diffusion, such as waste gas treatment and water treatment. The fluidized bed reactor can provide a large gas-solid contact area, promoting rapid diffusion of reactants. To prevent catalyst loss, a screen or cyclone separator can be provided at the bottom of the reactor.

  • Microchannel reactor: suitable for requiring high selectivity and high conversion ratesreaction systems, such as fine chemical and pharmaceutical intermediate synthesis. Microchannel reactors can provide extremely short mass transfer distances and uniform temperature distribution, thereby improving reaction rates and selectivity. To adapt to complex reaction conditions, heating, cooling and mixing devices can be integrated in the microchannel.

4. Optimize reaction conditions

The optimization of reaction conditions is the key to improving the application effect of SMP catalysts. By reasonably adjusting parameters such as temperature, pressure, flow rate and reaction time, the performance of the catalyst can be maximized. Here are some suggestions:

  • Temperature control: Temperature has an important influence on the rate and selectivity of catalytic reactions. Generally speaking, higher temperatures can speed up the reaction rate, but may also lead to the generation of by-products. Therefore, the appropriate operating temperature should be selected according to the specific reaction system. For exothermic reactions, the reaction temperature can be controlled by an external cooling device to prevent overheating; for endothermic reactions, the reaction rate can be increased by preheating the reactants or increasing the heat input.

  • Pressure Control: The effect of pressure on gas phase reaction is particularly significant. Higher pressures can increase the concentration of reactants, thereby increasing the reaction rate. However, excessive pressure may lead to excessive load on the equipment and increase safety risks. Therefore, the appropriate working pressure should be selected according to the specific reaction system. For high-pressure reactions, pressure-resistant reactors or segmented pressurization can be used to ensure safe operation.

  • Flow rate control: Flow rate has an important influence on the mass transfer and diffusion of reactants. Faster flow rates can promote rapid diffusion of reactants, but also shorten the reaction time and lead to a decrease in conversion rate. Therefore, the appropriate flow rate should be selected according to the specific reaction system. For reactions that require long-term contact, low flow velocity operation can be used; for systems that require fast reactions, high flow velocity operation can be used.

  • Reaction time control: Reaction time has a direct impact on product quality and yield. Longer reaction times can improve conversion rates, but may also lead to the generation of by-products. Therefore, the appropriate reaction time should be selected according to the specific reaction system. For reactions that require high selectivity, the reaction process can be monitored online and the reaction can be terminated in time to avoid overreaction.

5. Regular maintenance and regeneration

The long-term stable operation of SMP catalysts is inseparable from regular maintenance and regeneration. Through reasonable maintenance measures, the service life of the catalyst can be extended, the replacement frequency can be reduced, and the cost can be saved. Here are some suggestions:

  • Regular cleaning: During long-term operation, impurities or sediments may accumulate on the surface of the SMP catalyst, affecting its catalytic performance. Therefore, the catalyst should be cleaned regularly to remove impurities on the surface. Common cleaning methods include water washing, pickling washing, alkali washing and ultrasonic washing. Pay attention to controlling the concentration and temperature of the cleaning solution during cleaning to avoid damage to the catalyst.

  • Regeneration treatment: For inactivated SMP catalysts, their activity can be restored through regeneration treatment. Commonly used regeneration methods include calcination, redox treatment and chemical reduction treatment. The specific steps of the regeneration treatment should be selected according to the reason for the deactivation of the catalyst. For example, for catalysts that are inactivated by carbon deposits, carbon deposits can be removed by high temperature calcination; for catalysts that are inactivated by metal poisoning, their activity can be restored by chemical reduction treatment.

  • Performance Monitoring: In order to ensure the stable operation of SMP catalysts, the performance of the catalyst should be monitored regularly. Commonly used monitoring indicators include catalytic activity, selectivity, conversion rate and anti-toxicity. By comparing the performance data of new and old catalysts, problems can be discovered in a timely manner and corresponding measures can be taken. In addition, you can also monitor the reaction process online, grasp the operating status of the catalyst in real time, and warn of potential problems in advance.

Conclusion and Outlook

SMP, a new catalyst material, has shown great application potential in many industrial fields due to its unique physical and chemical characteristics. This article introduces the physical parameters, chemical parameters, performance parameters and preparation methods of SMP in detail, and combines domestic and foreign literature to display its new research results in the fields of environmental protection, petrochemicals, fine chemicals, etc. Through the best practice analysis of SMP catalysts, a series of suggestions are proposed from preparation method selection, surface modification, reactor design, reaction condition optimization to regular maintenance and regeneration, aiming to help enterprises improve production efficiency, reduce costs, and improve products Quality and market competitiveness.

Looking forward, the development prospects of SMP catalysts are very broad. With the global emphasis on green chemistry and sustainable development, the application of SMP catalysts in the field of environmental protection will be further promoted, especially in waste gas treatment, wastewater treatment and soil restoration. In addition, the application of SMP catalysts in the new energy field has also attracted much attention, such as fuel cells, hydrogen energy storage and carbon dioxide capture. Future research directions will focus on the following aspects:

  1. Development of high-performance SMP catalysts: By introducing new functional materials and nanotechnology, the pore structure, surface properties and catalytic activity of SMP catalysts will be further optimized, and SMP catalysts with higher performance will be developed. Meet the needs of different reaction systems.

  2. Scale preparation of SMP catalysts: Explore low-cost and efficient SMP catalyst preparation technology, solve the bottleneck problems in existing preparation methods, realize large-scale industrial production of SMP catalysts, and reduce production Cost, improve market competitiveness.

  3. Multifunctionalization of SMP catalysts: By combining other functional materials, develop SMP catalysts with multiple functions, such as composite catalysts with multiple functions such as catalysis, adsorption, photocatalysis, etc., to expand their Application scope to meet more complex industrial needs.

  4. Intelligent application of SMP catalysts: Combining the Internet of Things, big data and artificial intelligence technology, we develop intelligent SMP catalyst systems to realize real-time monitoring and intelligent regulation of catalyst performance, improve production efficiency, and reduce Energy consumption promotes the intelligent transformation of industrial production.

In short, as a forward-looking technology, the low-density sponge catalyst SMP will play an increasingly important role in future industrial development. Through continuous technological innovation and application expansion, SMP catalysts will surely become an important force in promoting industrial production and environmental protection, and make greater contributions to achieving green and sustainable development.

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