Silicone rubber refers to the main chain is composed of silicon and oxygen atoms alternately, silicon atoms are usually connected with two organic groups of rubber. Ordinary silicone rubber is mainly composed of silicon oxygen chains containing methyl and a small amount of vinyl. The introduction of phenyl can improve the high and low temperature resistance of silicone rubber, and the introduction of trifluoropropyl and cyanide can improve the temperature and oil resistance of silicone rubber. Silicone rubber has good low temperature resistance and can still work at -55℃. After the introduction of phenyl, it can reach -73℃. The heat resistance of silicone rubber is also very prominent, can work for a long time at 180℃, slightly higher than 200℃ can also withstand a few weeks or longer time is still elastic, instantaneous resistance to high temperature above 300℃. Silicone rubber has good air permeability and oxygen permeability is the highest in synthetic polymers. In addition, silicone rubber also has the outstanding characteristics of physiological inertia, will not cause clotting, so it is widely used in the medical field. [1]
Silicone rubber thermal vulcanization type (high temperature vulcanized silica gel HTV), room temperature vulcanization type (RTV), the room temperature vulcanization type and polycondensation reaction type and addition reaction type. High temperature silicone rubber is mainly used in the manufacture of various silicone rubber products, while room temperature silicone rubber is mainly used as adhesives, potting materials or molds. Hot vulcanization type the largest amount, hot vulcanization type is divided into methyl silicone rubber (MQ), methyl vinyl silicone rubber (VMQ, the amount and product brand most), methyl vinyl phenyl silicone rubber PVMQ (low temperature resistance, radiation resistance), other eyes silicone rubber, fluorine silicone rubber, etc.


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