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Octamethyltetrasiloxane is a kind of organosilicone compound which is hydrolyzed by condensation and distillation of trimethylchlorosilane and methyldichlorosilane under certain conditions. Polysiloxane containing amino group, epoxide group, hydroxyl group, sulfhydryl group, methyl acryloxyl group and other functional groups can be synthesized mainly through H-SI addition reaction.