Rubber is some large molecular chain hydrocarbons. Rubber with only carbon atoms in the main chain is called carbon chain rubber; rubber with other atoms in the main chain is called heterochain rubber; if the main chain contains silicon (Si), tin (Sn), boron (B) and other atoms of the organic group rubber, it is called elemental organic polymer. Silicone rubber is an elemental organic polymer containing organosilicon groups in the main chain. There are two types of vulcanization processes for silicone rubber, one is high temperature vulcanization, the corresponding silicone rubber is called high temperature vulcanized silicone rubber, or HTV for short; the other is room temperature vulcanization, and the corresponding silicone rubber is called room temperature vulcanized silicon Rubber, referred to as RTV. RTV silicone rubber is divided into two types, one is addition molding, and the other is condensation type.　　

    2. Condensed silicone rubber has terminal hydroxyl groups (-OH), which can easily condense with silanes containing easily hydrolyzable groups (-OCH3, -OCOCH3) for room temperature vulcanization. The crosslinking agent is ethanol silicate, and the catalyst is February silicon. Dibutyl stannate. Addition molding silicone rubber generally contains -CH=CH, end groups, and usually uses polysiloxane containing Si-H bond as crosslinking agent to crosslink into elastomer by self-addition reaction.

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