The earliest organosilicon glass resin and high temperature mica binder in China are Huo Changshun, Chen Rufeng and others of Chengguang Institute of Chemical Engineering, Ministry of Chemical Industry. In the late 1970s, CTS-103 organosilicon resin, commonly known as organosilicon glass resin, was successfully prepared by hydrolytic polycondensation of methyltriethoxysilane in the presence of acid catalyst. The resin was used for the treatment of high-grade paper and the coating protection of metal surface in the early stage. It can also be used for the bonding of mica sheets or mica powder. In 1980, Shanghai Resin Factory Fang Sanhua, Xue Zhiqing and Li Yansheng used solid cation exchange resins as temporary acid catalysts. Fang Sanhua used methyl triethoxysilane, Xue Zhiqing and Li Yansheng used methyl triethoxysilane as the main additive and a small amount of dimethyl diethoxysilane to synthesize transparent and wear-resistant SAR-1 and SAR-2 silicone resins, respectively. Because of the absence of residual inorganic acid, the storage property of the resin is very stable and no cementation is found after one year. Due to the introduction of a small amount of binary functional raw materials, SAR-2 products are hard, medium and soft, and have a wider range of applications. It can be widely used in glass, plastics, metals and other materials, especially for the protection of transparent plastics such as polycarbonate, polystyrene and polyvinyl chloride, as well as for the moisture-proof and insulation protection coating of electronic components, which will soon form large-scale production.


Qi Hongqiu, Li Yan and Cui Zuomin of Chengguang Chemical Research Institute from 1980 to 1982; Xu Zhihong and Xue Zhiqing of Shanghai Resin Factory from 1981 to 1983 used monomethyltrichlorosilane as main raw materials to prepare silicone high temperature resistant mica binder. The product brands are MR-30 and SAR-8 respectively. This kind of product has not only high temperature resistance, electrical insulation, moisture-proof, waterproof and other properties of ordinary silicone products, but also high cohesion and flame retardant properties. Mainly used in the manufacture of high temperature resistant mica board in household appliances, insulation of electronic tubes, high temperature resistant mica board for support, mica board for in-turn insulation of welding machines, etc. Various heat-resistant pigments can also be added as smokeless anti-corrosion coatings. They can also be used as non-flammable moulding composites or resins for ceramic moulding of glass fiber composite laminates and silica. There are abundant mica powder resources in China, which can be developed into a series of high temperature resistant insulating mica plate products.


SAR-8 and SAR-9 of Shanghai Resin Plant adopt their own process characteristics: hydrolysis and alcoholysis of organosilicon monomers, concentration and condensation at the same time. SAR-8 and SAR-9 were put into operation in 1983, and their output has reached nearly 1,000 tons. The main raw material of this product is methyl trichlorosilane, so whether MR-30 or SAR-8 is produced, SAR-9 can greatly improve the use value of methyl trichlorosilane.






Silicone moulding plastics


In the 1960s, China's aviation industry urgently needed an arc-resistant silicone moulding plastic for making micro-switches with high current and voltage resistance. Beijing Research Institute of Chemical Industry has successfully developed a silicone resin made from methyltrichlorosilane by direct hydrolysis and an arc-resistant plastic made from asbestos filler, which has solved the urgent need of aviation industry. The material was then transferred to Shanghai Resin Factory for production. After that, Shanghai Resin Factory stopped producing because of its small demand, but users still needed the material. They had to ask for help from Chengguang Chemical Research Institute, which relocated to Sichuan. In order to meet the urgent needs of users, Wu Shengquan et al. prepared silicone resin for moulding plastics with satisfactory properties from a hydrolytic condensation route using methyltriethoxysilane as starting material to solve the urgent needs of users.






Silicone resin encapsulant


In the late 1960s, with the development of electronic industry in China, it is necessary to use organic silicon encapsulation materials with excellent electrical insulation, high temperature resistance, moisture resistance and non-combustion to encapsulate large and small power diodes, triodes, resistors, capacitors, integrated circuits and other electronic devices. Zhang Xinghua, He Jigang, Institute of Chemistry, Chinese Academy of Sciences and Zhang Jikai, Li Yansheng, Shanghai Resin Factory, were engaged in the early development of this kind of resin in China. They developed a variety of products to fill the domestic gap.






Silicone Resin Modified Coatings


General silicone resin is mostly composed of polymethylsiloxane and polyphenylsiloxane. The compatibility of silicone resin containing phenyl with organic resin is better than that of methyl silicone resin. The introduction of phenyl-containing silicone resin in general coatings can improve the temperature and water resistance of general coatings. In the coating industry, high performance siloxane-containing coatings can be prepared by blending or copolymerizing phenyl-containing silicone resins. As early as the 1960s, Tianjin Paint Factory and Shanghai Resin Factory successfully developed synthetic resin coatings modified with silicone. Various kinds of epoxy resins with good properties, such as silicone modified epoxy resins, have been developed.