Analysis of High Temperature Resistant Silicone Rubber Components

The temperature range of high temperature resistant silicone rubber is -70℃-+350℃. The commonly used one is a kind of methylphenyl vinyl silicone rubber, which is a product obtained by introducing methylphenyl siloxane chain segments or diphenyl siloxane chain segments into the molecular chain of methyl vinyl silicone rubber. The introduction of phenyl groups on the side groups of polysiloxane has greatly reduced the crystallization temperature of the polymer due to the destruction of the regularity of the dimethylsiloxane structure, and expanded the low temperature application range of the polymer material.

When the phenyl content is 20~40%, it is called medium phenyl silicone rubber. It has excellent flame retardant properties and can self-extinguish once it catches fire.

When the phenyl content is 40~50%, it is called high phenyl silicone rubber. It has excellent radiation resistance and γ-ray resistance is 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 flame retardancy and radiation resistance of vulcanized rubber are improved.

Methylphenyl vinyl silicone rubber is one of the important materials for the aerospace industry, cutting-edge technology and other sectors of the national economy. It can be used to make various molded and extruded products for use as cold-resistant rubber in the aviation industry and for sealing rings, gaskets, pipes and rods for parts that are resistant to ablation, heat aging or radiation.

Therefore, in addition to the small compression permanent deformation, wide operating temperature range, oxidation resistance, weather resistance, shock resistance, moisture resistance and good electrical insulation properties of methyl vinyl silicone rubber, methylphenyl vinyl silicone rubber also has excellent low temperature resistance, ablation resistance and radiation resistance. These properties vary with the different phenyl content in the molecular chain. Generally speaking, when the phenyl content (ratio of phenyl to silicon atoms) is 5~10%, it is called low phenyl silicone rubber. It has unique cold resistance and can still maintain the elasticity of rubber at -70[size=10.5pt]~-100℃. It is the best low-temperature performance among all rubbers. In addition, it has the advantages of methyl vinyl silicone rubber and is not expensive, so it has a great trend to replace methyl vinyl silicone rubber.

The special ingredients contained in high temperature resistant silicone rubber can enable it to have good performance in the power industry and play an important role in value and trend.