Condensation type organic silicon resin aerogel and preparation method thereof

Abstract

The invention provides condensation type organic silicon resin aerogel and a preparation method thereof. Under the catalysis of a gel catalyst, condensation polymerization reaction is performed by hydroxyl-terminated silicon resin and a siloxane crosslinking agent, and after gelation and aging, wet gel is obtained by solvent replacement, supercritical drying and post-curing treatment. According tothe condensation type organic silicon resin aerogel and the preparation method thereof, by introducing the siloxane crosslinking agent and the gel catalyst into a solution of the hydroxyl-terminatedsilicon resin, condensation type organic silicon resin wet gel with a crosslinked network structure is prepared, then condensation type organic silicon resin aerogel is prepared by solvent replacement, supercritical drying and post-curing, and the technical problem that in prior art, condensation type silicon resin aerogel cannot be prepared due to the fact that the wet gal cannot be prepared fromcommercial hydroxyl-terminated silicon resin is solved.

Description

technical field [0001] The invention relates to a condensation type silicone resin airgel and a preparation method thereof, belonging to the technical field of airgel preparation. Background technique [0002] Airgel is a kind of highly dispersed solid nanomaterial with colloidal particles or polymer molecules aggregated into a nanoporous network structure. It has the characteristics of low density, high specific surface area, and low thermal conductivity. It is used in aerospace vehicle thermal control systems, Civil insulation and other fields have very broad application prospects. [0003] Condensed silicone resin is a polyorganosiloxane with a highly cross-linked network structure. The main chain structure is alternately connected with silicon and oxygen atoms, and the side chain is connected with organic groups. Therefore, it has the dual characteristics of organic resin and inorganic material. . Due to its excellent heat resistance, cold resistance, electrical insula...

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Problems solved by technology

[0004] At present, there is no public report on the use of commercial hydroxyl-terminated silicone resins to prepare condensation-type silicone resin aerogels at home and abroad. The content is less, and the distance between the active groups (-OH) between the molecules is relatively long, and it often takes several hours above 200°C to cure the resin

However, the preparation of condensation-type silicone resin airgel needs to prepare a wet gel in the solution first, and the hydroxyl content in the solution will be lower, which makes it difficult for the commercialized hydroxyl-terminated silicone resin to solidify in the solution to form a wet gel, and then cannot Preparation of Condensed Silicone Resin Airgel

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