Low-density high-stability aerogel material

By using a combination of specific monomers and catalysts to control the reaction process and uniformity, fluorinated polyimide aerogels with high porosity and low density were prepared, solving the problems of aerogel structural stability and mechanical strength, and achieving improved stability and performance under extreme environments.

CN122234450APending Publication Date: 2026-06-19CHONGQING UNIV OF ARTS & SCI
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Patent Information

Application Number
CN202610456045.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-08-12
Publication Date
2026-06-19

AI Technical Summary

Technical Problem

In the process of preparing high-porosity, low-density fluorinated polyimide aerogels, how to maintain the structural stability and mechanical strength of the aerogel, avoid collapse, and control the reaction rate and uniformity at the same time?

Method used

Using fluorinated diamine monomer TFMB, unfluorinated aromatic diamine monomer ODA, and fluorinated dianhydride monomer 6FDA as raw materials, triethylamine and N,N-dimethylcyclohexylamine were added to prepare a polyamic acid solution. After freeze-drying, thermal imidization was performed. Through the synergistic catalytic effect of triethylamine and DMCHA, combined with the regulation of diphenyl ether, the reaction process and uniformity were controlled to form a stable gel network.

Benefits of technology

A high-porosity, low-density fluorinated polyimide aerogel was prepared, exhibiting excellent mechanical strength and thermal stability. It can maintain structural integrity under extreme environments and possesses good thermal and sound insulation properties.

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Abstract

The invention relates to a low-density high-stability fluorine-containing polyimide aerogel which is prepared by the following steps: preparing a polyamide acid solution from TFMB, ODA and 6FDA, adding triethylamine into the polyamide acid solution to prepare fluorine-containing polyamide acid salt, dissolving the fluorine-containing polyamide acid salt into a mixed solution of water and diphenyl ether, adding triethylamine and N, N-dimethyl cyclohexylamine to prepare polyamide acid hydrogel, and carrying out high-density high-stability fluorine-containing polyimide aerogel. And finally, carrying out thermal imidization treatment to obtain the polyamide acid aerogel. The aerogel is prepared from three monomers, a low-density and high-porosity three-dimensional network structure is formed, the structure is stable, the heat-resistant temperature is high, good performance can be kept at the high temperature, and the aerogel has certain rigidity and strength, so that the aerogel is not prone to deformation and structural collapse under the action of external force.
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