A kind of condensation type silicone resin airgel and preparation method thereof

An organosilicon and condensation-type technology, which is applied in the field of condensation-type silicone resin aerogel and its preparation, can solve the problems that the condensation-type silicone resin aerogel cannot be prepared, the active group is far away, and the degree of hydroxyl reaction is high. , to achieve the effect of low overall cost, realization of cross-linking degree, and simple reaction process

Active Publication Date: 2022-06-24
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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  • A kind of condensation type silicone resin airgel and preparation method thereof
  • A kind of condensation type silicone resin airgel and preparation method thereof
  • A kind of condensation type silicone resin airgel and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0044] 1. Dissolve 200g Dowsil RSN 0806 (the solid content of the product itself is 50%, the solvent is a mixed solvent of toluene and xylene), 5g ethyl orthosilicate and 0.6g dibutyltin dilaurate in 800g ethyl acetate, stir at room temperature for 30min, pour It was left standing in the mold, and after the reaction system gelled, it was aged at room temperature for 24 hours to obtain a condensation-type silicone resin wet gel.

[0045] 2. Perform solvent replacement on the condensed silicone resin wet gel obtained in step 1, soak it with cyclohexane for 3 times, and then carry out supercritical CO 2 Drying, drying at 40° C. and 15 MPa for 8 h to obtain a condensation-type silicone resin aerogel.

[0046] 3. Post-curing the aerogel prepared in step 2, and the treatment conditions are 60°C for 1 hour, 80°C for 1 hour, 100°C for 1 hour, and 120°C for 1 hour.

[0047] The density of the condensation-type silicone resin aerogel obtained in this example is 0.15 g / cm 2 , see attac...

Embodiment 2

[0050] The preparation conditions and process of the condensation-type silicone resin aerogel are the same as those in Example 1, except that the mass of the added ethyl orthosilicate is 20 g, and the density of the aerogel is 0.18 g / cm 2 .

Embodiment 3

[0052] Except that the mass of ethyl orthosilicate added is 30g, the preparation conditions and process of condensation type silicone resin aerogel are the same as those in Example 1, and the density of aerogel is 0.2g / cm 2 .

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Abstract

The present invention proposes a condensation-type silicone resin airgel and its preparation method. Under the catalysis of the gel catalyst, the condensation polymerization reaction is carried out by the hydroxyl-terminated silicone resin and the siloxane crosslinking agent, and after gelation and aging The wet gel was obtained by solvent replacement, supercritical drying and post-curing. The present invention introduces a siloxane crosslinking agent and a gel catalyst into a solution of hydroxyl-terminated silicone resin to prepare a condensation-type organic silicon resin wet gel with a crosslinked network structure, and then undergoes solvent replacement to supercritically Dry and post-cure to prepare condensation-type silicone resin airgel, which solves the technical problem that the existing technology cannot use commercial hydroxyl-terminated silicone resin to prepare wet gel, and then cannot prepare condensation-type silicone resin aerogel .

Description

technical field [0001] The invention relates to a condensation type organosilicon resin aerogel and a preparation method thereof, belonging to the technical field of aerogel preparation. Background technique [0002] Aerogel is a highly dispersed solid nanomaterial composed of colloidal particles or polymer molecules mutually aggregated into a nanoporous network structure. It has the characteristics of low density, high specific surface area, and low thermal conductivity. Civil insulation and other fields have very broad application prospects. [0003] Condensed silicone resin is a polyorganosiloxane with a highly cross-linked network structure, with silicon and oxygen atoms alternately connected as the main chain structure, and side chains are connected with organic groups, so it has the dual characteristics of organic resins and inorganic materials. . Due to its excellent heat resistance, cold resistance, electrical insulation, corona resistance, radiation resistance, mo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/28C08G77/44C08L83/10
CPCC08J9/28C08G77/44C08J2205/026C08J2205/042C08J2201/0502C08J2383/10
Inventor 刘韬刘圆圆张恩爽郭慧徐春晓李文静杨洁颖赵英民张昊
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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