Method for preparing a silica suspension in a potentially crosslinkable silicone material
申请人:Chaussade Marc
公开号:US20060258780A1
公开(公告)日:2006-11-16
The invention concerns a method for preparing a precipitated silica in a silicone oil, said suspension being useable for producing silicones crosslinkable by polyaddition, polycondensation or condensation by dehydrogenation (elastomers). The invention aims at solving the problem of finding a compromise between cost, rheology and mechanical properties of the final elastomers. Therefor, the invention provides a method for preparing a precipitated silica suspension treated with trimethylchlorosilane, in the presence of hexamethyldisiloxane, in a crosslinkable silicone oil. HCl can be used. Grafting of hydrophobic units on the silica and incorporation of the polyorganosiloxane silicone material are carried out during one single processing sequence, without passing through the powder form for the silica. Sodium silicate promoting MQ resin can be incorporated in the reaction medium. One of the characteristics of the inventive method is that it does not at all comprise a step involving dried hydrophobic silica. The invention also concerns the preparation of crosslinkable silicone elastomer composition from said suspension, and the resulting composition.
本发明涉及一种在硅油中制备沉淀二氧化硅的方法,该悬浮液可用于生产可通过聚加成链、聚缩成链或脱氢缩合(弹性体)交联的硅烷。本发明旨在解决在最终弹性体的成本、流变学和机械性能之间寻找折衷方案的问题。因此,本发明提供了一种在可交联硅油中处理三甲基氯硅烷的沉淀二氧化硅悬浮液的制备方法,在六甲基二硅氧烷的存在下进行。可以使用HCl。在一次处理序列中,在不经过硅烷粉末的情况下,对硅烷进行了疏水基的嫁接和聚有机硅烷硅材料的纳入。可以在反应介质中加入促进MQ树脂的硅酸钠。本发明的一个特点是根本不包括涉及干燥的疏水性二氧化硅的步骤。本发明还涉及从所述悬浮液中制备可交联硅弹性体组合物及所得组合物的制备。