Hydrophobic organosilicate-modified silica gels

C - Chemistry – Metallurgy – 01 – B

Patent

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Details

C01B 33/159 (2006.01) C01B 33/154 (2006.01) C01B 33/16 (2006.01) C08K 9/06 (2006.01) C08L 83/00 (2006.01) C09C 1/30 (2006.01)

Patent

CA 2279296

The present invention is hydrophobic organosilicate-modified silica gels and a method for their preparation. The method comprises two steps, where in the first step an organosilicate-modified silica hydrosol is heat treated in the presence of a strong mineral acid at a pH less than pH 1 to form 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 thereby forming a hydrophobic organosilicate-modified silica hydrogel having a surface area within a range of 100 m2/g to 750 m2/g as measured in the dry state. In a preferred method, the hydrophobic organosilicate-modified silica gel 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.

La présente invention concerne des gels de silice hydrophobes modifiés à l'organosilicate, ainsi que leur procédé de préparation. Ce procédé comprend deux étapes; la première étape consiste à traiter thermiquement un hydrosol de silice modifié à l'organosilicate, en présence d'un acide minéral fort, à un pH inférieur au pH 1, afin de former un hydrogel de silice modifié à l'organosilicate. La seconde étape consiste à faire réagir cet hydrogel de silice modifié à l'organosilicate avec un composé organosilicique, en présence d'une quantité catalytique d'un acide fort, afin de rendre hydrophobe ledit hydrogel de silice modifié à l'organosilicate, qui présente à l'état sec une surface active variant entre 100 m<2>/g et 750 m<2>/g. Dans un procédé préféré, le gel de silice hydrophobe modifié à l'organosilicate est mis en présence d'une quantité suffisante d'un solvant organique hydro-immiscible afin de convertir l'hydrogel de silice hydrophobe modifié à l'organosilicate en un organogel de silice à l'organosilicate modifié.

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