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Polyimide aerogel and preparation method thereof

A polyimide and aerogel technology, applied in the field of thermal insulation materials, can solve the problems of high equipment requirements, long time required and high cost, and achieve the effects of high mechanical strength, short time required and low cost

Inactive Publication Date: 2019-06-21
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The currently commonly used supercritical-chemical imidization method is limited by the long time required, the use of highly toxic solvents, high equipment requirements, and high cost.

Method used

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  • Polyimide aerogel and preparation method thereof
  • Polyimide aerogel and preparation method thereof
  • Polyimide aerogel and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0036] This embodiment provides a polyimide airgel, and its specific preparation steps are as follows:

[0037] Step 1: Preparation of water-soluble polyamic acid: use N,N-dimethylacetamide as solvent, carry out in ice-water bath by equimolar ratio of 4,4'-diaminodiphenyl ether and terephthalic anhydride The polyamic acid with a mass fraction of 15% was prepared by condensation polymerization. The specific process is as follows: Dissolve 8.0096g of 4,4'-diaminodiphenyl ether in 95.57g of N,N-dimethylacetamide, add 8.8556g of pyromellitic dianhydride, and carry out polymerization in an ice-water bath for 5h , to prepare a water-soluble polyamic acid solution with a mass fraction of 15%. The prepared water-soluble polyamic acid is poured into deionized water for precipitation to obtain a polyamic acid prepolymer, and then washed and freeze-dried to obtain a water-soluble polyamic acid fiber for use. This method refers to the patent "A graphene oxide / polyamic acid hydrogel with...

Embodiment 2

[0041] The difference between this example and Example 1 is that the mass fraction of polyamic acid in step 1 is 7%, and the deionized water in step 2 is 15g, and the obtained polyimide airgel is denoted as PI-2.

Embodiment 3

[0043] The difference between this example and Example 1 is that the amount of ethanol used in step 2 is 2 g, and the obtained polyimide airgel is denoted as PI-3.

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Abstract

The invention relates to the field of thermal insulation materials and provides a preparation method of polyimide aerogel. The method is characterized by comprising the following steps: step 1, preparing polyamide acid hydrogel; step 2, freezing the polyamide acid hydrogel at low temperature, and performing freeze drying and thermal imidization to obtain the polyimide aerogel. The prepared polyimide aerogel has low density, high strength and high flame retardant capacity, isotropic and anisotropic thermal insulation materials can be obtained, various application scenarios can be met, the preparation process is simple and easy to operate, shorter time is needed, cost is low, environmental protection is realized, toxic solvents are not used, and the potential of large-scale application is provided.

Description

technical field [0001] The invention relates to the field of thermal insulation materials, in particular to a freeze-dried polyimide aerogel with thermal insulation function and a preparation method thereof. Background technique [0002] Airgel refers to a porous material with a continuous three-dimensional network formed after the liquid component of the hydrogel is replaced by air. It has the characteristics of low density, high specific surface area, and low thermal conductivity. It is widely used in aerospace and automotive industries. , petrochemical, building insulation and ship high-speed rail and other fields have broad prospects. The mechanical properties of traditional silica aerogels severely limit the popularization and use of aerogels. Therefore, polyimide aerogels have been developed, which effectively improves the mechanical strength of aerogels and improves the practical application of aerogels. potential. [0003] Polyimide (Polyimide) is a special enginee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/28C08L79/08C08J3/075
Inventor 樊玮张翔刘天西赵兴宇
Owner DONGHUA UNIV
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