Procede de preparation de silice hydrophobe

Method of preparing hydrophobic silica

Abstract

The present invention provides a method of treating silica, wherein dry silica is contacted with a reaction medium consisting essentially of concentrated aqueous acid and a hydrophobing agent selected from the group consisting of organosiloxanes and organochlorosilanes. The silica is then reacted with the hydrophobing agent in the reaction medium for about 90 minutes or less at a temperature from about 10 °C to about 40 °C to provide a hydrophobic treated silica. The hydrophobic treated silica then is recovered.
La présente invention se rapporte à un procédé de traitement de la silice consistant à mettre en contact avec un milieu réactionnel composé essentiellement d'un acide aqueux concentré et d'un agent susceptible de rendre hydrophobe et sélectionné dans le groupe constitué d'organosiloxanes et d'organochlorosilanes. On fait ensuite réagir la silice avec l'agent susceptible de rendre hydrophobe dans le milieu réactif pendant environ 90 minutes au maximum, à une température comprise approximativement entre 10 °C et 40 °C de façon à produire une silice traitée hydrophobe. Il est ensuite possible de récupérer la silice traitée hydrophobe.

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Patent Citations (8)

    Publication numberPublication dateAssigneeTitle
    EP-0251176-A2January 07, 1988Toray Silicone Company, Ltd.Method for modifying the surface of finely divided silica
    EP-0382370-A1August 16, 1990Dow Corning CorporationBehandeltes Siliziumdioxid zur Verstärkung von Silikonelastomer
    FR-2078599-A5November 05, 1971Ici Ltd
    GB-682574-ANovember 12, 1952Dow Corning LtdImprovements in or relating to silica compositions
    GB-783868-AOctober 02, 1957Midland Silicones LtdA process of preparing hydrophobic organo-silicon powders
    JP-S61204113-ASeptember 10, 1986Kao CorpDyestuff-containing powdery cosmetic
    US-3948676-AApril 06, 1976Deutsche Gold- Und Silber-Scheideanstalt Vormals RoesslerProcess for preparing hydrophobic particles
    US-4054689-AOctober 18, 1977The Dow Chemical CompanyMethod of preparing hydrophobic silica

NO-Patent Citations (2)

    Title
    DATABASE WPI Section Ch, Week 199042 Derwent Publications Ltd., London, GB; Class J04, AN 1990-316859 XP002119341 & JP 02 226066 A (NAKARAI TESK KK), 7 September 1990 (1990-09-07)
    PATENT ABSTRACTS OF JAPAN vol. 011, no. 038 (C-401), 4 February 1987 (1987-02-04) & JP 61 204113 A (KAO CORP), 10 September 1986 (1986-09-10)

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    CN-1317188-CMay 23, 2007清华大学Process for preparing hydrophobic silicon dioxide aerogel using rice husk ash as raw material
    EP-1431245-A1June 23, 2004Degussa-Hüls AktiengesellschaftSilice structurée en aérogel, à surface modifiée
    US-7019037-B2March 28, 2006Battelle Memorial InstituteMonolayer coated aerogels and method of making
    US-7402293-B2July 22, 2008Degussa AgSurface-modified, aerogel-type structured silica