The effect of polyurethane catalyst 9727 on improving product surface quality

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 μm, while when using T-9 catalyst, the surface roughness is 0.5 μm. 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 μm, 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 μm, 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 μm, 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 μm, 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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