Process for the preparation of modified aerogels, and their use

Details Process for the preparation of modified aerogels, and their use Process for the preparation of modified aerogels, and their use

C - Chemistry, Metallurgy

01

B

C01B 33/16 (2006.01) C04B 14/06 (2006.01)

Patent

CA 2211831

The invention is concerned with a process for the production of modified SiO2 aerogels, in which (a) a silicatic lyogel is produced, (b) the lyogel produced in (a) is subjected to a solvent exchange to give another organic solvent, (c) the gel obtained in step (a) or (b) is reacted with at least one chlorine-free silylation agent and (d) the gel obtained in step (c) is subjected to subcritical drying; and use thereof.

L'invention concerne un procédé de production d'aérogels SiO¿2? modifiés, selon lequel a) on prépare un lyogel aux silicates, b) on soumet le lyogel produit pendant l'étape a) à un échange de solvant pour obtenir un autre solvant organique, c) le gel obtenu au cours de l'étape a) ou b) est mis à réagir avec au moins un agent de silylation exempt de chlore, et d) le gel obtenu au cours de l'étape c) est séché de manière sous-critique. L'invention concerne également l'utilisation de ces aérogels.

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