C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
C01B 33/155 (2006.01) C08K 9/06 (2006.01) C09C 1/30 (2006.01)
Patent
CA 2278505
The present invention is hydrophobic silica gels and a method for their preparation under neutral conditions. The method comprises two steps, where in the first step of the pH of a silic hydrosol is adjusted with a base to within a range of pH 3 to pH 7 to facilitate formation of a silica hydrogel. In the second 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. In a preferred method, in a third step the hydrophobic silica gel is contacted with a sufficient quantity of a water-immiscible organic solvent to convert the hydrophobic silica hydrogel into a hydrophobic silica organogel.
La présente invention concerne des gels de silice hydrophobes ainsi que leur procédé de préparation dans des conditions neutres. Ce procédé comprend deux étapes; la première étape consiste à ajuster le pH d'un hydrosol de silice au moyen d'une base dont le pH se situe entre 3 et 7, dans le but de favoriser la formation d'un hydrogel de silice. La seconde étape consiste à mettre en contact cet hydrogel de silice avec un composé organosilicique, en présence d'une quantité catalytique d'un acide fort, afin de rendre hydrophobe ledit hydrogel de silice. Dans un procédé préféré, une troisième étape consiste à faire réagir le gel de silice hydrophobe avec une quantité suffisante d'un solvant organique non hydromiscible afin de convertir l'hydrogel de silice hydrophobe en un organogel de silice hydrophobe.
Burns Gary Thomas
Deng Qin
Hahn James Richard
Reese Clifford Carlton
Dow Corning Corporation
Gowling Lafleur Henderson Llp
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