B - Operations – Transporting – 01 – J
Patent
B - Operations, Transporting
01
J
B01J 13/00 (2006.01) C01B 33/16 (2006.01)
Patent
CA 2274911
The invention relates to a method for producing organically modified aerogels with permanently hydrophobic surface groups, wherein a) a lyogel is provided; b) the lyogel provided in step (a) is wahed with an organic solvant; c) the surface of the gel obtained in step (b) is silylated; and d) the silylated surface gel obtained in step (c) is dried. The invention is characterized in that a disiloxane of the formula (I) R3Si-O-SiR3 is used as silylating agent in step (c), wherein the radicals R mean individually, being the same or different, either a hydrogen atom or a non-reactive organic linear, branched, cyclic, saturated or unsaturated, aromatic or heteroaromatic radical.
L'invention concerne un procédé pour la fabrication d'aérogels modifiés organiquement, comportant des groupes de surface durablement hydrophobes, dans lequel (a) on prend un lyogel, (b) on lave ce lyogel avec un solvant organique, (c) on silyle en surface le gel obtenu à l'étape (b), et (d) on sèche le gel silylé en surface obtenu à l'étape (c). Ce procédé est caractérisé en ce que l'on utilise, lors de l'étape (c), comme agent de silylation un disiloxane de la formule (I) R¿3?Si-O-SiR¿3?, dans laquelle les restes R, qui sont identiques ou différents, représentent, indépendamment l'un de l'autre, un atome d'hydrogène ou bien un reste aromatique ou hétéroaromatique non réactif, organique, linéaire, ramifié, cyclique, saturé ou insaturé.
Cabot Corporation
Fetherstonhaugh & Co.
LandOfFree
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