C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
C01B 33/158 (2006.01) C01B 33/143 (2006.01) C01B 33/16 (2006.01) C04B 14/06 (2006.01)
Patent
CA 2237096
The invention concerns a process for preparing organically modified aerogels, in which: a) a silicic acid sol having a pH of 4.0 is prepared from an aqueous sodium silicate solution using at least one organic and/or inorganic acid; b) the resultant silicic acid sol is polycondensed to form an SiO2 gel by the addition of a base; c) the gel obtained in step b) is washed with an organic solvent until the water content of the gel is 5 wt.%; d) the gel obtained in step c) is surface-silylated; and e) the surface-silylated gel obtained in step d) is dried. The process is characterized in that the at least one acid forms salts with the sodium silicate cations in the silicic acid sol, which salts are difficult to dissolve. Before step b) the salts produced which are difficult to dissolve are precipitated out to the greatest extent possible and separated from the silicic acid sol.
L'invention concerne un procédé de préparation d'aérogels modifiés de manière organique, selon lequel a) un sol d'acide silicique d'un pH ? 4,0, est préparé à partir d'une solution aqueuse de silicate de potassium, à l'aide d'au moins un acide organique et/ou inorganique, b) le sol d'acide silicique obtenu est polycondensé par adjonction d'une base pour former un gel de SiO¿2?, c) le gel obtenu à l'étape b) est lavé avec un solvant organique jusqu'à ce que sa teneur en eau soit ? 5 % en poids, d) le gel obtenu à l'étape c) est silylé en surface, et e) le gel silylé en surface obtenu à l'étape d) est séché. Ce procédé se caractérise en ce qu'on utilise au moins un acide qui forme dans le sol d'acide silicique, conjointement avec les cations du silicate de potassium, des sels difficilement solubles. Avant l'étape b), les sels difficilement solubles obtenus sont précipités et séparés du sol d'acide silicique.
Cabot Corporation
Fetherstonhaugh & Co.
Hoechst Research & Technology Deutschland Gmbh & Co. Kg
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