High temperature silicone rubber temperature range of use -70 ℃ - +350 ℃, commonly used is a called methyl phenyl vinyl silicone rubber, it is methyl vinyl silicone rubber molecular chain in the introduction of methyl phenyl silicon Chain or diphenyl siloxane chain derived products. The introduction of phenyl groups on the pendant groups of polysiloxanes greatly reduces the crystallization temperature of the polymer due to the destruction of the regularity of the structure of the dimethylsiloxane, thus expanding the low temperature range of the polymer material.
Phenyl content of 20 to 40%, said the phenyl silicone rubber, it has excellent flame resistance, once the fire can be self-extinguishing.
Phenyl content of 40 ~ 50%, said high phenyl silicone rubber, it has excellent resistance to radiation, resistance to γ-ray 1xI08 Lunqin. In general, with the increase of phenyl content, the rigidity of silicone rubber molecular chain gradually increased, the silicone rubber low temperature performance gradually decreased, but with the increase in the content of phenyl, vulcanized rubber to improve the resistance and radiation Illuminate.
Methylphenyl vinyl silicone rubber is the aerospace industry, cutting-edge technology and other departments of the national economy, one of the important materials for the production of various molded and extruded products used as the aviation industry, cold-resistant rubber and for ablation, Heat-resistant or resistant parts of the radiation ring, pad, pipe and bar and so on.
Therefore, methylphenyl vinyl silicone rubber in addition to methyl vinyl silicone rubber with all the compression set is small, the use of a wide temperature range, anti-oxidation, weather, shock, moisture and good electrical insulation properties, but also has excellent Low temperature resistance, ablation resistance and radiation resistance, etc. These properties vary with the phenyl content in the molecular chain. Generally speaking, the phenyl content (ratio of phenyl group to silicon atom) is in the range of 5 to 10% Called low-phenyl silicone rubber, it has a unique cold performance, in -70 [size = 10.5pt] ~ -100 ℃ can still maintain the flexibility of rubber, rubber is the best of all the low-temperature performance, coupled with it The advantages of methyl vinyl silicone rubber and the cost is not high, so a great replacement for methyl vinyl silicone rubber trend.
High temperature silicone rubber contains a special component can promote its power industry in the good use of performance, can play an important value and trends.