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2. 发明授权

US5919298A Method for preparing hydrophobic fumed silica 失效
标题翻译：制备疏水性热解法二氧化硅的方法
公开(公告)号：US5919298A
公开(公告)日：1999-07-06
申请号：US5852
申请日：1998-01-12
申请人： Phillip Joseph Griffith , William Herron , Brian Robert Harkness , Rosemary Margaret Taylor , David James Wilson
发明人： Phillip Joseph Griffith , William Herron , Brian Robert Harkness , Rosemary Margaret Taylor , David James Wilson
IPC分类号： C01B33/18 , C08K3/36 , C08K9/06 , C09C1/30 , C04B14/04
CPC分类号： C09C1/3081 , C08K3/36 , C08K9/06 , C01P2006/12 , C01P2006/90
摘要： A method for the preparation of hydrophobic fumed silicas which are useful, for example, as reinforcing fillers in rubber compositions. The method comprises two steps, where in the first step an aqueous suspension of fumed silica is contacted with an organosilicon compound in the presence of a catalytic amount of an acid to effect hydrophobing of the fumed silica. In the preferred method the first step is conducted in the presence of a water miscible organic solvent which facilitates hydrophobing of the fumed silica with the organosilicon compound and the fumed silica has a BET surface area greater than 50 m.sup.2 /g. In the second step the aqueous suspension of the fumed silica is contacted with a water-immiscible organic solvent at a solvent to silica weight ratio greater than 0.1:1 to effect separation of the hydrophobic fumed silica from the aqueous phase. In a preferred process the hydrophobic fumed silica has a surface area within a range of about 100 m.sup.2 /g to 750 m.sup.2 /g.
摘要翻译：用于制备疏水性热解法二氧化硅的方法，其可用于例如橡胶组合物中的增强填料。该方法包括两个步骤，其中在第一步骤中，在催化量的酸存在下，将热解法二氧化硅的水悬浮液与有机硅化合物接触以进行热解法二氧化硅的疏水。在优选的方法中，第一步是在水混溶性有机溶剂的存在下进行，该有机溶剂有利于有机硅化合物的热解法二氧化硅的疏水化，并且煅制二氧化硅的BET表面积大于50m 2 / g。在第二步中，将热解法二氧化硅的水悬浮液与水不混溶的有机溶剂以溶剂与二氧化硅重量比大于0.1:1的比例接触，以使疏水性热解二氧化硅与水相分离。在优选的方法中，疏水性热解法二氧化硅具有在约100m 2 / g至750m 2 / g范围内的表面积。

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