Methyl phenyl vinyl silicone rubber

Methyl phenyl vinyl silicone rubber is in methyl vinyl silicone rubber molecular chain in the introduction of methyl phenyl siloxy chain or diphenyl siloxy chain products. The introduction of phenyl group to the side group of polysiloxane can greatly reduce the crystallization temperature of the polymer because of the destruction of the structure regularity of dimethylsiloxane, and expand the low temperature application range of the polymer material. Therefore, methyl phenyl vinyl silicone rubber in addition to all the methyl vinyl silicone rubber compression permanent deformation is small, wide use temperature range, oxidation resistance, weather resistance, shock, moisture and good electrical insulation performance, but also has excellent low temperature resistance, ablative resistance and radiation resistance and other properties. These properties vary with the different content of phenyl in the molecular chain. Generally speaking, the content of phenyl (the ratio of phenyl to silicon atoms) in 5 ~ 10% is called low phenyl silicone rubber. It has unique cold resistance and can still maintain the elasticity of rubber at -70 ~ -100℃. In addition, it has the advantages of methyl vinyl silicone rubber and the cost is not high, so there is a trend to replace methyl vinyl silicone rubber. The phenyl content of 20 ~ 40% is called the phenyl silicone rubber, it has excellent fire resistance characteristics, once the fire can be self-extinguishing. Phenyl content in 40 ~ 50%, high phenyl silicone rubber, it has excellent radiation resistance, resistance to γ -ray 1xI08 roentgen. Generally speaking, with the increase of phenyl content, the rigidity of silicone rubber molecular chain gradually increases, and the low temperature resistance of silicone rubber gradually decreases, but with the increase of phenyl content, the fire resistance and radiation resistance of vulcanized rubber are improved. Methyl phenyl vinyl silicone rubber is one of the important materials in aerospace industry, cutting-edge technology and other departments of national economy. It can be used for making various molded and extruded products as cold resistant rubber in aviation industry and sealing rings, pads, pipes and bars for ablative, heat aging or radiation resistant parts.