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 about 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 about 100 m2/g to 850 m2/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. |
申请公布号 |
AU6661098(A) |
申请公布日期 |
1998.09.09 |
申请号 |
AU19980066610 |
申请日期 |
1998.02.18 |
申请人 |
DOW CORNING CORPORATION |
发明人 |
GARY T. BURNS;QIN DENG;JAMES R. HAHN;CLIFFORD C. REESE |
分类号 |
C01B33/159;C01B33/16;C09C1/30;C09C3/12 |
主分类号 |
C01B33/159 |
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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