Silicone resin is different from silicone oil and silicone rubber. The glass transition temperature (Tg) of the cured silicone resin is >200℃, while the typical silicone rubber Tg<-60℃. Methyl silicone resin has the lowest carbon content, it has high heat resistance, the methyl group connected to the silicon atom has the least steric hindrance, the resin has a high degree of crosslinking, high hardness, and low thermoplasticity. It is used as a waterproof and moisture-proof The cement is ideal. However, pure methyl silicone resin has poor compatibility with pigments, etc., and has low thermal elasticity. The introduction of phenyl groups into polymethylsiloxane can improve the thermal elasticity of the product, the miscibility of the pigment, and the adhesion to various substances. , Can also improve its thermal stability.
      The performance of methyl phenyl silicone resin mainly depends on two factors: one is the R/Si mentioned above, and it is also closely related to the ratio of methyl and phenyl (CH3/C6H5). Organic groups connected by silicon atoms The type has a great influence on the performance of the resin. When it is methyl, it can impart thermal stability, mold release, water repellency, and arc resistance to the silicone resin; when it is phenyl, it can impart oxidation stability to the resin, which can be within a certain range. Destroy the crystallinity of the polymer; when it is vinyl, it can improve the curing characteristics of silicone resin and bring coupling; when it is tetrachlorophenyl, it can improve the lubricity of the polymer; when it is phenylethyl , Can improve the miscibility of silicone resin with organics; when it is aminopropyl, it can improve the water solubility of the polymer, and at the same time bring coupling; when it is pentyl, it can improve the hydrophobicity of silicone resin. Therefore, different organic groups can be introduced during the preparation of the silicone resin. In order to improve the adhesiveness of the silicone resin, the silicone resin can be copolymerized with polyester, epoxy, phenolic, etc., and the silicone-polyester copolymer can be combined with a hydroxyl-containing polyester and an alkoxy-containing silane (or siloxane). ), or by condensation reaction with silicon-containing hydroxyl silane (or siloxane).