发明名称 |
METHOD FOR MAKING HYDROPHOBIC ORGANOSILICATE-MODIFIED SILICA GELS UNDER NEUTRAL CONDITIONS |
摘要 |
The present invention is hydrophobic organosilicate-modified silica gels and a method for their preparation under neutral conditions. The method comprises two steps, where in the first step the pH of an organosilicate-modified silica hydrosol is adjusted with a base to within a range of pH 3 to pH 7 to facilitate formation of an organosilicate-modified silica hydrogel. In the second step, the organosilicate-modified silica hydrogel is contacted with an organosilicon compound in the presence of a catalytic amount of a strong acid to effect hydrophobing of the organosilicate-modified silica hydrogel to form a hydrophobic organosilicate-modified silica gel having a surface area within a range of 100 m<2>/g to 850 m<2>/g in the dry state. In a preferred process, the hydrophobic organosilicate-modified silica hydrogel is contacted with a sufficient quantity of a water-immiscible organic solvent to convert the hydrophobic organosilicate-modified silica hydrogel into a hydrophobic organosilicate-modified silica organogel. A water soluble compound of cerium or iron may be added in the second step to improve the heat stability of the hydrophobic organosilicate-modified silica gel.
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申请公布号 |
WO9837021(A1) |
申请公布日期 |
1998.08.27 |
申请号 |
WO1998US03319 |
申请日期 |
1998.02.18 |
申请人 |
DOW CORNING CORPORATION |
发明人 |
BURNS, GARY, T.;DENG, QIN;HAHN, JAMES, R.;REESE, CLIFFORD, C. |
分类号 |
C01B33/159;C01B33/16;C09C1/30;C09C3/12;(IPC1-7):C01B33/16 |
主分类号 |
C01B33/159 |
代理机构 |
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