Silicone rubber refers to the rubber whose main chain is composed of silicon and oxygen atoms alternately, and there are usually two organic groups attached to the silicon atoms. Ordinary silicone rubber is mainly composed of silicone chains containing methyl groups and a small amount of vinyl groups. The introduction of phenyl can improve the high and low temperature resistance of silicone rubber, and the introduction of trifluoropropyl and cyano can improve the temperature and oil resistance of silicone rubber. Silicone rubber has good low temperature resistance, and generally can still work at -55°C. After introducing phenyl, it can reach -73°C. The heat resistant silicone rubber is also outstanding. It can work for a long time at 180 °C, and it can withstand a few weeks or longer at a temperature slightly higher than 200 °C. It can still withstand high temperatures above 300 °C instantly. Silicone rubber has good air permeability, and its oxygen transmission rate is the highest among synthetic polymers. In addition, silicone rubber also has the outstanding characteristics of being physiologically inert and not causing blood clotting, so it is widely used in the medical field.
Silicone rubber is divided into heat vulcanization type (high temperature vulcanization silica gel HTV), room temperature vulcanization type (RTV), and room temperature vulcanization type is divided into polycondensation reaction type and addition reaction type. High temperature silicone rubber is mainly used to manufacture various silicone rubber products, while room temperature silicone rubber is mainly used as adhesive, potting material or mold. The thermal vulcanization type has the largest amount, and the thermal vulcanization type is divided into methyl silicone rubber (MQ), methyl vinyl silicone rubber (VMQ, the largest amount), methyl vinyl phenyl silicone rubber PVMQ (low temperature resistance, radiation resistance), and others There are eye-catching silicone rubber, fluorosilicone rubber and so on.
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