Process for producing xerogel composites

C - Chemistry – Metallurgy – 08 – G

Patent

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Details

C08G 18/32 (2006.01) C08J 9/28 (2006.01) C08J 9/35 (2006.01)

Patent

CA 2753830

The invention relates to a method for producing xerogel composites, comprising: (a) providing a composition containing an organic gel precursor (A) comprising a monomer component (A1) of at least one multi-functional isocyanate and a monomer component (A2) of at least one compound selected from multifunctional amines and multifunctional hydroxy compounds; (b) converting the gel precursor (A) into a xerogel composite in the presence of a macroporous open-cell foam (B) and a solvent (C); (c) drying the xerogel composite by transferring the solvent (C) into the gaseous state at a temperature and a pressure below the critical temperature and the critical pressure of the solvent (C). The invention further relates to the xerogel composite that can be thus produced and to the use thereof as insulation material, for thermal insulation, for vacuum insulation panels, and in refrigerators or buildings.

L'invention concerne un procédé de production de composites de xérogel, comprenant : (a) la préparation d'une composition contenant un précurseur de gel organique (A) comprenant un composant monomère (A1) constitué d'au moins un isocyanate polyfonctionnel et un composant monomère (A2) constitué d'au moins un composé choisi parmi des amines polyfonctionnelles et des composés hydroxy polyfonctionnels; (b) la mise en réaction du précurseur de gel (A) en présence d'une mousse (B) macroporeuse à cellules ouvertes et d'un solvant (C) pour former un composite de xérogel; (c) le séchage du composite de xérogel par transfert du solvant (C) à l'état gazeux à une température et une pression inférieures à la température critique et à la pression critique du solvant (C). L'invention concerne également les composites de xérogel pouvant ainsi être obtenus, ainsi que leur utilisation en tant que matériau isolant, pour l'isolation thermique, pour des panneaux d'isolation sous vide, dans des appareils de réfrigération ou dans des bâtiments.

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