发明名称 |
NEUTRAL GEALTERTE HYDROPHOBE KIESELSAÜREGELE MIT VERRINGERTER SPEZIFISCHER OBERFLÄCHE |
摘要 |
The present invention is neutral-aged hydrophobic silica gels having a reduced surface area and a method for their preparation. The method comprises three steps, where in the first step a mixture comprising a silica hydrosol and colloidal silica is contacted with a strong mineral acid at a pH less than about 1 to form a silica hydrogel having incorporated therein colloidal silica. In the second step the silica hydrogel is aged at a pH within a range of about pH 3.5 to pH 8. In the third step the silica hydrogel is contacted with an organosilicon compound in the presence of a catalytic amount of a strong acid to effect hydrophobing of the silica hydrogel to form a hydrophobic silica hydrogel having a surface area within a range of about 100 m2/g to 450 m2/g in the dry state. In a preferred method the hydrophobic silica hydrogel and is further contacted with a sufficient quantity of a water-immiscible organic solvent to convert the hydrophobic silica hydrogel into a hydrophobic silica organogel. |
申请公布号 |
DE69813191(T2) |
申请公布日期 |
2004.02.05 |
申请号 |
DE1998613191T |
申请日期 |
1998.02.18 |
申请人 |
DOW CORNING CORP., AUBURN |
发明人 |
BURNS, T.;DENG, QIN;HAHN, R.;REESE, C. |
分类号 |
C01B33/159;C01B33/16;C09C1/30;(IPC1-7):C01B33/159 |
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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