Methyl phenyl vinyl silicone methyl phenyl vinyl silicone is in the methyl vinyl silicone molecular chain in the introduction of methyl phenyl silicon oxygen link or diphenyl silicon oxygen chain and the product. 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 in addition to all the compression of methyl vinyl silicone permanent deformation is small, the use of a wide temperature range, oxidation resistance, weather resistance, shock, moisture and good electrical insulation properties, but also has excellent low temperature resistance, ablative resistance and radiation resistance. 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 silica gel. 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 and the cost is not high, so there is a trend to replace methyl vinyl silicone.
The phenyl content of 20 ~ 40% is called the phenyl silica gel, it has excellent fire resistance characteristics, once the fire can be self-extinguishing. The phenyl content in 40 ~ 50% is called high phenyl silica gel, it has excellent radiation resistance, resistance to γ -ray 1xI08 roentgen. Generally speaking, with the increase of phenyl content, the rigidity of silica gel molecular chain gradually increases, and the low temperature resistance of silica gel gradually decreases, but with the increase of phenyl content, the fire resistance and radiation resistance of vulcanized rubber are improved. Methyl phenyl vinyl silicone is one of the important materials in aerospace industry, cutting-edge technology and other sectors of the national economy. It can be used to make a variety of molded and extruded products as cold-resistant rubber in aviation industry and sealing rings, pads, pipes and bars for ablative resistance, heat aging resistance or radiation resistance parts.