Study On The Preparation Of Silicone Foam

There are three ways, which include liquid, solid and rubber, to make silicone foam, analyzing the reaction principles in preparation of silicone foam. The prescription and technics of preparation of silicone foam are decided by selections of the viscosity of hydroxyl-terminated polydimethylsiloxane and hydroxyl-terminated silicone resin, varieties of blowing anent, varieties and amounts of catalysts, reaction temperature and varieties of sulfofication agent. The silicone foam is provided with aperture of close and well-proportioned, heat stability.During the study of preparation of silicone foam, the drawing performance of silicone foam are enhanced through adjusting its mechanics performance by adding silicon dioxide;The possibility of system's interaction in the process of mixing is reduced, through adopting hydroxyl-terminated polydimethylsiloxane of low viscosity as controlling agent to deal with the surface of silicon dioxide;Solving the cooperation problem of crosslinking velocity of foam and decomposing velocity of blowing agent through reducing the decomposing temperature of blowing agent H by adding pentaerythrite and carbamide;Solving the problem of low sulfofication extent in the preparation of silicone foam and enhancing the drawing performance of silicone foam.The innovation of the article is increasing the viscosity of silicone alloy and silicone resin by prepolymerizing the hydroxyl-terminated polydimethylsiloxane, Adopting tetramethyl ammonium hydroxide replacing platinum as activator to catalyze the blowing and crosslinking reaction between hydrogen silicone and hydroxyl-terminated, and the crosslinking reaction between polydimethylsiloxane, hydrogen silicone and ethylene-terminated polydimethylsiloxane.