发明名称 |
Method for preparing hydrophobic silica gels |
摘要 |
A method for the preparation of hydrophobic silica gels which are useful as reinforcing fillers in rubber compositions. The method comprises two steps, where in the first step a silica hydrosol is contacted with a sufficient concentration of a strong mineral acid at a pH less than about pH 1 to form a silica hydrogel. In the second step the silica hydrogel is contacted with described organosilicon compounds in the presence of a catalytic amount of a strong acid to effect hydrophobing of the silica hydrogel thereby forming a hydrophobic silica gel having a surface area within a range of about 100 m2/g to 750 m2/g as measured in the dry state. In a preferred method the hydrophobic silica hydrogel is contacted with a sufficient quantity of a water-immiscible organic solvent to convert the hydrophobic silica hydrogel into a hydrophobic silica organogel.
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申请公布号 |
US5789514(A) |
申请公布日期 |
1998.08.04 |
申请号 |
US19970806016 |
申请日期 |
1997.02.24 |
申请人 |
DOW CORNING CORPORATION |
发明人 |
BURNS, GARY THOMAS;HAHN, JAMES RICHARD;REESE, CLIFFORD CARLTON |
分类号 |
C01B33/16;(IPC1-7):C08G77/06 |
主分类号 |
C01B33/16 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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