Low temperature resistant silicone rubber is a new generation of green, environment-friendly and energy-saving silicone material. It can be quickly vulcanized at low temperature and can be vulcanized at 120 ° C. There is no need to add vulcanizing agent and secondary vulcanization. The vulcanization temperature of conventional silica gel materials is 180 ° C, and the molding time is long, so it is necessary to add double two four or double two five as catalysts, and the products need secondary vulcanization.
Low temperature resistant silicone rubber refers to silicone rubber with a working temperature of - 100 ℃. Its mechanism is different from conventional silicone rubber. It is obtained by introducing methylphenyl siloxane chain or diphenyl siloxane chain into the molecular chain of methyl vinyl silicone rubber. The compression permanent deformation is small, and the service temperature range is wide.
The low temperature resistant silicone rubber introduced phenyl on the side group of polysiloxane, which destroyed the structural regularity of dimethylsiloxane, greatly reduced the crystallization temperature of the polymer, and the working temperature of the silicone rubber was extended to - 100 ℃.
It has small compression permanent deformation, wide use temperature range, oxidation resistance, weather resistance, shock resistance, moisture-proof and good electrical insulation performance, as well as low temperature resistance, ablation resistance and radiation resistance.
Low temperature resistant silica gel materials are divided into the following categories:
1. Low phenyl silicone rubber is called when the phenyl content (the ratio of phenyl to silicon atom) is 5~10%.
2. When the phenyl content is 20~40%, it is called medium phenyl silicone rubber, which has flame resistance and can extinguish itself once it is ignited.
3. When the phenyl content is 40-50%, it is called high phenyl silicone rubber, which has radiation resistance. The radiation 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. However, with the increase of phenyl content, the flame resistance and radiation resistance of vulcanizate are improved.
Low temperature resistant silica gel materials are used in aerospace industry, cutting-edge technology and other sectors of the national economy. It can be used to make various molded and extruded products, and it can be used as cold resistant rubber in the aviation industry, and can be used as a sealing element for parts resistant to ablation, heat aging or radiation.

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