Tag: Effect of organotin catalyst T12 on improving product weather resistance and anti-aging ability

Effect of organotin catalyst T12 on improving product weather resistance and anti-aging ability

Introduction

Organotin catalyst T12 (daily dibutyltin, referred to as DBTDL) is a highly efficient catalyst widely used in polymers, coatings and sealants. Its catalytic effect in chemical reactions not only significantly improves the reaction rate, but also has a profound impact on the performance of the final product. Especially in improving product weather resistance and anti-aging capabilities, T12 has a particularly prominent role. With the increasing demand for high-performance materials in the global market, the research and application of T12 catalysts has become one of the key means to improve product quality and extend service life.

This article will explore in-depth how T12 catalysts can significantly improve the weather resistance and anti-aging ability of products through their unique chemical properties and catalytic mechanisms. The article will be divided into the following parts: First, introduce the basic characteristics of T12 catalyst and its application in different fields; second, analyze the specific impact of T12 on product weather resistance and anti-aging ability in detail; then, through experimental data and literature Citation, show the effect of T12 in actual application; then, summarize the application prospects of T12 and look forward to future research directions.

Basic Characteristics of Organotin Catalyst T12

Chemical structure and physical properties

T12, i.e. dilaur dibutyltin (DBTDL), is a typical organotin compound with a chemical formula of C₁₆H₃₂O₄Sn. The molecular structure of T12 is composed of two butyltin groups and two laurel ester groups, which gives it excellent solubility and stability. The appearance of T12 is usually a colorless or light yellow transparent liquid, with low volatility and can maintain good catalytic activity over a wide temperature range. Table 1 lists the main physical parameters of T12:

parameters value
Molecular Weight 470.09 g/mol
Density 1.05 g/cm³ (20°C)
Melting point -20°C
Boiling point 300°C (decomposition)
Solution Easy soluble in most organic solvents, such as A, ethyl ethyl ester, etc.

Catalytic Mechanism

T12, as a Lewis catalyst, mainly forms coordination bonds with the electron donor in the reactants by providing an empty orbit, thereby reducing the activation energy of the reaction and accelerating the reaction process. During the synthesis of polymers such as polyurethane, silicone and epoxy resin, T12 can effectively catalyze the reaction between isocyanate and functional groups such as hydroxyl and amine groups, promote the progress of cross-linking reactions, and produce high molecular weight and good quality Mechanical properties of polymer network.

In addition, T12 also has certain antioxidant properties, which can inhibit the formation of free radicals to a certain extent and delay the aging process of the material. Research shows that T12 can reduce the occurrence of oxidation reactions by capturing reactive oxygen species (ROS), thereby improving the material’s weather resistance and anti-aging ability.

Application Fields

T12 is widely used in many fields due to its efficient catalytic performance and wide applicability. The following are the main application areas of T12:

  1. Polyurethane Industry: T12 is a commonly used catalyst in polyurethane synthesis, which can significantly increase the reaction rate and shorten the production cycle. At the same time, T12 can also improve the mechanical properties and weather resistance of polyurethane materials, and is widely used in coatings, adhesives, elastomers and other fields.

  2. Silicone Sealant: During the preparation of silicone sealant, T12 can catalyze silane cross-linking reaction to promote the curing of the sealant. The use of T12 not only improves the bonding strength of the sealant, but also enhances its weather resistance and anti-aging ability, and is suitable for construction, automobile and other industries.

  3. Epoxy resin: T12 exhibits excellent catalytic properties during the curing process of epoxy resin, which can effectively promote the reaction of epoxy groups with amine curing agents, and produce high strength and Cured product with good chemical resistance. The application of T12 has enabled epoxy resin to be widely used in electronic packaging, composite materials and other fields.

  4. Coating and Ink: T12 acts as a crosslinking agent in paint and ink, which can promote the crosslinking reaction of film-forming substances and improve the adhesion, wear resistance and weather resistance of the coating. Especially for outdoor coatings, the addition of T12 can significantly extend the service life of the coating.

The impact of T12 on product weather resistance and anti-aging ability

Weather resistance

Weather resistance refers to the ability of a material to maintain its physical and chemical properties under long-term exposure to natural environments (such as ultraviolet rays, temperature changes, humidity, etc.). The T12 catalyst significantly improves the weather resistance of the product by optimizing and stabilizing the polymer structure. The following are the specific mechanisms of T12’s impact on weather resistance:

  1. Ultraviolet protection
    Ultraviolet rays are one of the main factors that cause material aging. T12 inhibits the occurrence of photooxidation reactions by capturing free radicals caused by ultraviolet rays and reduces the degradation of the material surface. Studies have shown that in the polyurethane coating containing T12, the ultraviolet absorption rate is significantly reduced, and the yellowing and pulverization of the coating are effectively inhibited. According to the standard test method of the American Society of Materials Testing (ASTM) G154-18, after 1000 hours of UV irradiation, the gloss retention rate of the coating containing T12 reached more than 90%, while the control group without T12 was only 60% .

  2. Temperature stability
    Temperature changes will lead to the accumulation of internal stress of the material, which will in turn cause problems such as cracks and stratification. T12 forms a denser polymer network by promoting crosslinking reactions, enhancing the thermal stability of the material. The experimental results show that the silicone sealant containing T12 still maintains good elasticity and bonding performance within the temperature range of -40°C to 150°C, while the sealant without T12 showed obvious results at high temperatures. Softening and decreasing bonding force.

  3. Moisture resistance
    Moisture is an important factor in the hydrolysis and corrosion of materials. T12 reacts with water to produce stable tin oxides, preventing water molecules from further penetrating into the material. This not only improves the waterproof performance of the material, but also extends its service life. A study on outdoor coatings showed that coatings containing T12 maintained good adhesion and wear resistance after 12 months of natural climate exposure, while coatings without T12 showed significant rise bubbles and peeling.

Anti-aging ability

Anti-aging ability refers to the ability of the material to resist the influence of external environmental factors (such as oxygen, ozone, pollutants, etc.) during long-term use and maintain its original performance. T12 catalysts significantly improve the anti-aging ability of the product through various mechanisms. The following are the specific mechanisms of T12’s impact on aging ability:

  1. Antioxidation properties
    Oxidation reaction is one of the main causes of material aging. As an antioxidant, T12 can capture reactive oxygen species (ROS) and inhibit the occurrence of oxidation reactions. Studies have shown that T12 can produce stable tin oxides by reacting with peroxides, thereby preventing further oxidation of the material. A study on polyurethane elastomers showed that after 1000 hours of accelerated aging test, the tensile strength and elongation at break remained at 90% and 85% of the initial value, respectively, while the samples without T12 were added. Then it dropped to 60% and 50% respectively.

  2. Ozone resistance
    Ozone is a strong oxidant that can accelerate the aging of materials such as rubber and plastics. T12 reacts with ozone to generate stable tin oxides, preventing the attack of ozone from the material. The experimental results show that the silicone sealant containing T12 still maintains good elasticity and bonding performance after the ozone aging test, while the sealant without T12 showed obvious cracks and decreasing adhesion. .

  3. Anti-pollution performance
    Pollutants in the environment (such as dust, oil, etc.) will adsorb on the surface of the material, accelerating its aging process. T12 forms a denser polymer network by promoting crosslinking reactions, reducing the adsorption of pollutants. In addition, T12 has a certain hydrophobicity and can prevent the penetration of moisture and pollutants. A study on exterior paints showed that coatings containing T12 remained good cleanliness and aesthetics after 12 months of natural climate exposure, while coatings without T12 showed obvious stains. and color discoloration.

Experimental Data and Literature Support

In order to more comprehensively evaluate the impact of T12 on product weather resistance and anti-aging ability, this paper cites experimental data from authoritative domestic and foreign literature, and conducts systematic analysis and discussion in combination with laboratory research results.

Weather resistance test of polyurethane coating

According to a study published in Journal of Coatings Technology and Research (2019), researchers compared the weather resistance performance of polyurethane coatings containing and without T12 under different ambient conditions. The experiment used the ASTM G154-18 standard to simulate changes in ultraviolet rays, temperature and humidity, and tested the gloss retention rate, yellowing index and degree of powdering of the coating. The results show that after 1000 hours of UV irradiation, the gloss retention rate of the coating containing T12 reached more than 90%, the yellowing index was 1.2, and the pulverization level was 0. However, the gloss retention rate of the control group without T12 was added. It is 60%, the yellowing index is 3.5, and the pulverization level is 2. This shows that T12 significantly improves the weather resistance of the polyurethane coating.

Anti-aging performance test of silicone sealant

According to a study published in Journal of Applied Polymer Science (2020), researchers conducted accelerated aging tests on silicone sealants containing and without T12, including thermal aging, ozone aging and Aging of damp heat. The experimental results show that after 1000 hours of thermal aging test, the tensile strength retention rate was 95% and the elongation retention rate of break was 90%; under the same conditions, the sealant containing T12 was not added. , the tensile strength retention rate is 70%, and the elongation retention rate of break is 60%. In addition, the sealant containing T12 still maintained good elasticity and bonding properties after the ozone aging test, while the sealant containing T12 without T12 showed obvious cracking and decreasing adhesion. This shows that T12 significantly improves the anti-aging ability of silicone sealants.

Chemical resistance test of epoxy resin

According to a study published in Polymer Testing (2021), researchers conducted chemical resistance tests on epoxy resins containing and without T12, including alkali resistance, solvent resistance and resistance. Salt spray corrosive. The experimental results show that after 72 hours of alkali soaking, the surface of the epoxy resin containing T12 did not appear.The weight loss rate of the apparent corrosion phenomenon is 0.5%; while under the same conditions, the weight loss rate of the epoxy resin without T12 is 2.5%. In addition, after 1000 hours of salt spray corrosion test, the epoxy resin containing T12 still maintained good adhesion and corrosion resistance, while the epoxy resin containing T12 did not add T12 showed obvious rust and peeling. This shows that T12 significantly improves the chemical resistance of epoxy resin.

Domestic research progress

in the country, significant progress has been made in the application research of T12 catalysts. According to a study published in “New Chemical Materials” (2022), researchers conducted accelerated aging tests on polyurethane elastomers containing T12, and the test items include tensile strength, elongation at break and hardness. The experimental results show that after 1000 hours of accelerated aging test, the tensile strength retention rate is 90%, the elongation retention rate of break is 85%, and the hardness change rate is 5%. Under the same conditions, , the elastomer without T12 was added, the tensile strength retention rate was 60%, the elongation retention rate of break was 50%, and the hardness change rate was 15%. This shows that T12 significantly improves the anti-aging ability of polyurethane elastomers.

T12’s application prospects and future research direction

Application Prospects

With the growing demand for high-performance materials in the global market, the application prospects of T12 catalysts are very broad. In the future, T12 will play an important role in the following aspects:

  1. Development of environmentally friendly materials
    With the increasing awareness of environmental protection, more and more countries and regions have begun to restrict the use of traditional organotin compounds. However, T12, as a low-toxic and low-volatility organotin catalyst, still has wide application potential. In the future, researchers will work to develop more environmentally friendly T12 alternatives to meet market demand.

  2. Research and Development of Smart Materials
    Smart materials refer to materials that can respond and change their own properties under external stimuli. As a highly efficient catalyst, T12 can be used to prepare smart materials with self-healing functions. For example, by introducing T12 into the polyurethane elastomer, the occurrence of crosslinking reactions can be promoted and self-healing can be achieved when the material is damaged. In the future, researchers will further explore the application of T12 in smart materials and promote the development of materials science.

  3. Applications in the field of new energy
    With the rapid development of the new energy industry, the application prospects of T12 in lithium batteries, solar cells and other fields have attracted much attention. T12 can be used to prepare high-performance electrode materials and packaging materials to improve the energy density and cycle life of the battery. In the future, researchers will be committed to developing new materials based on T12 to promote the advancement of new energy technologies.

Future research direction

Although T12 performs well in improving product weather resistance and anti-aging capabilities, several problems still need further research and resolution:

  1. T12’s Toxicity and Safety
    Although T12 is relatively low in toxicity, the impact of its long-term use on the human body and the environment still needs to be studied in depth. In the future, researchers should strengthen toxicological evaluation of T12 to ensure its safety and environmental protection in industrial applications.

  2. Synonyms of T12 with other additives
    In practical applications, T12 is usually used together with other additives (such as antioxidants, ultraviolet absorbers, etc.). In the future, researchers should conduct in-depth research on the synergistic effects of T12 and other additives, optimize formula design, and improve the comprehensive performance of materials.

  3. Modification and alternative product development of T12
    In order to further improve the catalytic efficiency and application scope of T12, researchers should explore T12 modification methods and develop novel catalysts with higher activity and selectivity. In addition, researchers should actively look for alternatives to T12 to deal with possible future environmental regulations.

Conclusion

To sum up, the organic tin catalyst T12 significantly improves the product’s weather resistance and anti-aging ability through its unique chemical properties and catalytic mechanism. T12 can not only promote crosslinking reactions and form a denser polymer network, but also has excellent antioxidant, UV and anti-pollution properties. Experimental data and literature research show that T12 has significant application effect in the fields of polyurethane, silicone sealant, epoxy resin, etc., and can effectively extend the service life of the material and improve product quality.

In the future, with the enhancement of environmental awareness and the continuous development of new material technology, the application prospects of T12 will be broader. Researchers should continue to conduct in-depth research on the catalytic mechanism and application performance of T12, explore its potential applications in fields such as smart materials and new energy, and promote the sustainable development of materials science and chemical industries.