申请人:Dow Corning Toray Silicone Company, Ltd.
公开号:EP0909777A2
公开(公告)日:1999-04-21
A method for continuous preparation of a high consistency or liquid silicone rubber base does not cause abrasive wear of the extruder screw and of the extruder cylinder or blackening of the silicone rubber base even when the latter is admixed with such fillers as an inorganic filler in the form of a diatomaceous earth powder, quartz or a similar large-grained and hard substance, or with a fumed silica, sedimentary silica, or a similar reinforcing silica filler. The method comprises continuously kneading the following components in a multiple-stage shear type single-screw extruder: (A) a freely-flowable powdered silicone rubber mixture having its main components in the form of (a) a cross-linkable polydiorganosiloxane with a viscosity exceeding 1 x 105 mPa·s at 25°C and (b) an inorganic filler, and (B) a high consistency silicone rubber base having its main components in the form of (a) a cross-linkable polydiorganosiloxane with a viscosity exceeding 1 x 105 mPa·s at 25°C and (c) a reinforcing silica filler, or a liquid silicone rubber base having its main components in the form of (d) a cross-linkable polydiorganosiloxane with a viscosity below 1 x 105 mPa·s at 25°C and (c) a reinforcing silica filler.
一种连续制备高浓度或液体硅橡胶基料的方法,即使在硅橡胶基料中掺入硅藻土粉末、石英或类似大颗粒硬质物质形式的无机填料,或气相二氧化硅、沉积二氧化硅或类似的补强二氧化硅填料,也不会造成挤出机螺杆和挤出机筒体的磨损或硅橡胶基料变黑。该方法包括在多级剪切式单螺杆挤压机中连续捏合以下组分:(A) 可自由流动的粉末状硅橡胶混合物,其主要成分为:(a) 25°C 时粘度超过 1 x 105 mPa-s 的可交联聚二有机硅氧烷;(b) 无机填料、和(B)高浓度硅橡胶基料,其主要成分为(a)25°C 时粘度超过 1 x 105 mPa-s 的可交联聚二有机硅氧烷和(c)补强二氧化硅填料,或液体硅橡胶基料,其主要成分为(d)25°C 时粘度低于 1 x 105 mPa-s 的可交联聚二有机硅氧烷和(c)补强二氧化硅填料。