There are many ways to classify silicone rubber, usually divided into solid silicone rubber and liquid silicone rubber according to the shape before curing; According to the vulcanization temperature is divided into room temperature vulcanized silicone rubber, high temperature vulcanized silicone rubber; According to the different monomers used, it can be divided into methyl vinyl silicone rubber, methyl phenyl vinyl silicone rubber, fluorine silicon, nitrile silicone rubber, etc. According to the different performance and use, it can be divided into general type, ultra-low temperature resistance type, ultra-high temperature resistance type, high strength type, oil resistance type, medical type, etc.
  Dimethylsilicone rubber for short methylsilicone rubber:
Silicone rubber preparation of high molecular weight linear dimethylpolysiloxane rubber, must have high purity raw materials, in order to ensure the purity of raw materials, industry is usually first after distillation purification, content of more than 99.5% of dimethyldichlorosilane in ethanol-water medium, under acid catalysis hydrolysis condensation, The difunctional siloxane tetramer, octamethylcyclotetrasiloxane, was separated, and then the tetracyclic body was formed into a high molecular linear dimethylpolysiloxane under the action of a catalyst.
  Dimethylsilicone rubber is a colorless transparent elastomer, which is usually vulcanized with organic peroxides with higher activity. vulcanizate
In the range of -60~+250℃, the vulcanization activity of dimethylsilicone rubber is low, the high temperature compression permanent deformation is large, it is not suitable for making thick products, thick products vulcanization is more difficult, the inner layer is also easy to foam. Because of the superior performance of methyl vinyl silicone rubber containing a small amount of vinyl, dimethyl silicone rubber has been gradually replaced by methyl vinyl silicone rubber. Other types of silicone rubber produced and applied today, in addition to containing dimethylsiloxane structural units, they also contain more or less other difunctional siloxane structural units, but the preparation method is not intrinsically different from that of dimethylsilicone rubber, and the preparation method is generally conducive to the formation of rings under conditions. The silicon monomer with a certain bifunctive degree is hydrolyzed and condensed, and then octamethylcyclotetrasiloxane is added according to its required proportion, and then the reaction is made under the action of catalyst.