Silicone resins are widely used in the field of coatings because of their excellent high temperature resistance, weather resistance and chemical stability.However, the adhesion of pure silicone resins is relatively weak, which limits their use in certain scenarios.In order to improve the adhesion of silicone resin coatings, researchers have developed a variety of modification methods. The following are several common modification strategies and their effects.：
1. Epoxy resin modification
The composite modification of epoxy resin and silicone resin is one of the effective methods to improve adhesion.The preparation of epoxy modified silicone resin by chemical condensation or sol-gel method can significantly improve the adhesion and mechanical properties of the coating.For example, studies by Zhu Aiqin and others have found that the adhesion of epoxy-modified silicone resins to substrates such as glass is significantly enhanced, and the microstructure of the coating is more uniform.In addition, the introduction of epoxy groups can also improve the chemical resistance and thermal stability of the coating.
2. Acrylic resin modification
The introduction of acrylic resin can significantly improve the adhesion and water resistance of silicone resin.This modification is usually achieved by addition reaction, esterification reaction, or free radical polymerization.For example, Gao Haidong modified the silicone prepoler through acrylic monomers, and found that the modified coating showed good adhesion and stability in the seawater soaking environment.In addition, the adhesion of the acrylic modified silicone resin to the metal surface can reach level 1, and the bending radius can reach 2.5 mm.
3. Alkyd resin modification
The composite modification of alkyd resin and silicone resin can improve the adhesion and weather resistance of the coating.By adjusting the reaction conditions and proportions, the modified silicone resin has been significantly improved in terms of heat resistance and adhesion.For example, Li Xiuqing and others prepared an alkyd resin modified silicone resin by polycondensation method, and found that the adhesion and impact resistance of the coating film were significantly improved.
4. Silane coupling agent modification
Silane coupling agents are a class of silicon compounds containing reactive functional groups that can chemically bond with silicone resins and other substrates to enhance the adhesion between the coating and the substrate.For example, by introducing a silane coupling agent such as γ-(2,3-epoxypropoxy) propyltrimethoxysilane into the silicone resin, the adhesion of the coating to substrates such as metal and glass can be significantly improved.
5. Polyester resin modification
The copolymer modification of polyester resin and silicone resin can improve the adhesion and wear resistance of the coating.For example, Xu Dawei and others prepared a polyester resin modified silicone resin by monomer copolymer method, and found that the modified coating has improved in terms of hardness and UV aging resistance.
summary
Through the above modification method, the adhesion of the silicone resin has been significantly improved, while retaining its excellent high temperature resistance, weather resistance and chemical stability.These modification strategies not only broaden the scope of application of silicone resins in the field of coatings, but also provide technical support for the development of high-performance acid and alkali-resistant coatings.In the future, with the development of more new modification methods, the performance of silicone resins in coating adhesion will be even better.
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IOTA 6146 acrylic modified silicone resin - IOTA CORPORATION LTD.
