MONOLITHIC, SUPER HEAT-INSULATING, ORGANIC AEROGEL COMPOSITION PREPARATION METHOD, SAID COMPOSITION, AND THE USE THEREOF

摘要

The invention relates to a process for preparing a gelled, dried composition forming a monolithic aerogel with a heat conductivity of less than or equal to 40 mW·m−1·K−1 and derived from a resin of polyhydroxybenzene(s) and formaldehyde(s), to this aerogel composition and to the use thereof. This process comprises:
a) polymerization in an aqueous solvent of said polyhydroxybenzene(s) and formaldehyde(s) in the presence of an acidic or basic catalyst, to obtain a solution based on the resin,b) gelation of the solution obtained in a) to obtain a gel of the resin, andc) drying of the gel to obtain a dried gel.;According to the invention, step a) is performed in the presence of a cationic polyelectrolyte dissolved in this solvent, and the process also comprises a step d) of heat treatment under inert gas of the dried gel obtained in step c) at temperatures of between 150° C. and 500° C. to obtain the non-pyrolyzed aerogel whose heat conductivity is substantially unchanged, even after exposure to a humid atmosphere.

主权项

1: A process for preparing a gelled, dried and non-pyrolyzed composition forming an organic monolithic aerogel with a heat conductivity of less than or equal to 40 mW·m−1·K−1, the composition being at least partly derived from a resin obtained by polycondensation of at least one polyhydroxybenzene R and at least one formaldehyde F, the process comprising:
a) polymerizing the at least one polyhydroxybenzene R and the at least one formaldehyde in an aqueous solvent W in the presence of an acidic or basic catalyst, to obtain a solution based on the resin; b) gelling of the solution to obtain a gel of the resin; and c) drying the gel to obtain a dried gel, wherein: the polymerizing a) is performed in the presence of at least one water-soluble cationic polyelectrolyte P dissolved in aqueous solvent W; and the process further comprises a step d) of heat treating the dried gel under an inert gas at temperatures of between 150° C. and 500° C. to obtain the non-pyrolyzed aerogel in which the heat conductivity is substantially unchanged, even after exposure to a humid atmosphere.