Method of polymerizing oligomers of polydiorganosiloxane in the presence of filler
申请人:DOW CORNING CORPORATION
公开号:EP0120645A2
公开(公告)日:1984-10-03
Oligomers of low molecular weight polydiorganosiloxanes, polydiorganocyclosiloxanes, or mixtures, are polymerized in the presence of acidic or neutral reinforcing fillers. Trifluoromethane sulfonic acid is used as the polymerization catalyst. The method can also include endblocked polydiorganosiloxane to control the molecular weight of the silicone polymer in the silicone polymer-filler produced. The method combines the oligomer and filler, heats to from 70 to 150°C, adds catalyst, adjusts temperature, and polymerizes the mixture, then inactivates with a Lewis base such as calcined magnesium oxide. The non-creping silicone polymer-filler mixture which is the product of the method is usable as electrical insulation grease, or as a reinforced polymer mixture useful in producing silicone elastomers. The mixture can be mixed with curing agents to produce heat-curable and moisture-curable elastomeric compositions.
低分子量聚二有机硅氧烷、聚二有机环硅氧烷或混合物的低聚物在酸性或中性增强填料的存在下进行聚合。三氟甲磺酸用作聚合催化剂。该方法还可包括封端聚二有机硅氧烷,以控制硅聚合物-填料中硅聚合物的分子量。该方法将低聚物和填料混合,加热至 70 至 150°C,加入催化剂,调节温度,使混合物聚合,然后用路易斯碱(如煅烧氧化镁)灭活。该方法制得的硅树脂聚合物-填料非蠕变混合物可用作电绝缘润滑脂,或用作生产硅树脂弹性体的增强聚合物混合物。该混合物可与固化剂混合,生产热固化和湿固化弹性体组合物。