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A kind of anisotropic polyimide airgel material and preparation method thereof

A technology of polyimide and polyamic acid, applied in the field of polyimide airgel materials

Active Publication Date: 2021-03-19
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] There is no report on the preparation of anisotropic polyimide airgel by freezing method

Method used

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  • A kind of anisotropic polyimide airgel material and preparation method thereof
  • A kind of anisotropic polyimide airgel material and preparation method thereof
  • A kind of anisotropic polyimide airgel material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] The preparation of the polyimide airgel of embodiment 1 anisotropy

[0054] 1. Preparation of polyamic acid ammonium salt (PAS) aqueous solution

[0055] PAS aqueous solution with a mass ratio of polyamic acid to water of 3:97: Take 10g of polyamic acid, add 323.3g of deionized water, add dropwise 4.76g of triethylamine, and stir evenly with magnetic force.

[0056] PAS aqueous solution with a mass ratio of polyamic acid to water of 5:95: Take 10g of polyamic acid, add 190g of deionized water, add dropwise 4.76g of triethylamine, and stir evenly with magnetic force.

[0057] PAS aqueous solution with a mass ratio of polyamic acid to water of 8:92: take 10g of polyamic acid, add 115g of deionized water, add dropwise 4.76g of triethylamine, and stir evenly with magnetic force.

[0058] PAS aqueous solution with a mass ratio of polyamic acid to water of 10:90: Take 10g of polyamic acid, add 90g of deionized water, add dropwise 4.76g of triethylamine, and stir evenly with ...

Embodiment 2

[0061] Example 2 Preparation of anisotropic polyimide / multi-walled carbon nanotube composite airgel

[0062] 1. Preparation of PAS / MWCNT hybrid system

[0063] Take 15 g of polyamic acid, add 135 g of deionized water, dropwise add 7.14 g of triethylamine, and stir evenly with a magnetic force to obtain a PAS aqueous solution with a mass ratio of polyamic acid to water of 10:90. In addition, 0.6 g of multi-walled carbon nanotubes was weighed, and 150 g of deionized water was added. The mixture was ultrasonically dispersed on an ultrasonic cleaning machine for 2 h, and then ultrasonically dispersed on an ultrasonic cell pulverizer for 0.5 h, finally obtaining a uniformly dispersed multi-walled carbon nanotube aqueous suspension. The multi-walled carbon nanotube aqueous suspension was poured into the PAS aqueous solution, and magnetically stirred for 2 hours to obtain a uniform mixture system. In this system, the mass ratio of polyamic acid to water is 5:95, and the mass ratio ...

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Abstract

The invention provides an anisotropic polyimide airgel material, a polyimide / inorganic nano particle composite airgel material and a preparation method thereof. The present invention adopts freezing method to prepare polyimide airgel material and polyimide / inorganic nano particle composite airgel material, adopts freezing liquid to freeze, controls freezing direction, and the prepared airgel material has anisotropy, It has broad application prospects in the fields of low dielectric materials, substance adsorption, substance separation, heat insulation protection, acoustic damping, catalysts and drug carriers.

Description

technical field [0001] The invention belongs to the field of airgel materials, in particular to an anisotropic polyimide airgel material. Background technique [0002] Airgel is a new type of solid porous material that fills most of its internal space with air medium. It has the characteristics of extremely low density, high porosity, and low thermal conductivity. It is used in heat insulation materials and low dielectric materials. , gas separation and filtration, catalysts and drug carriers, material adsorption and acoustic damping and other fields have broad application prospects. [0003] Polyimide airgel is an organic airgel based on polyimide (PI) material. Compared with inorganic aerogels, polyimide aerogels have good toughness, low thermal conductivity and excellent heat resistance, and can be used as thermal insulation and protection materials for aircraft. In addition, polyimide has low dielectric properties. After being made into aerogel, its dielectric properti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/28C08J3/075C08K7/24C08L79/08C08G73/10
CPCC08G73/1003C08G2350/00C08J3/075C08J9/28C08J2379/08C08K7/24C08L79/08
Inventor 刘鹏波张彬吴鹏邹华维
Owner SICHUAN UNIV
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