Heat insulation polyimide nanofiber aerogel and preparation method thereof

A nanofiber and polyimide technology is applied in the field of thermal insulation polyimide nanofiber aerogel and its preparation, which can solve the problems of aerogel structure damage, loss of thermal insulation ability and the like, and achieve stress relief. The effect of concentration, excellent thermal insulation ability, good thermal insulation ability

Inactive Publication Date: 2019-10-25
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] CN 108864473 A discloses an ultra-light heat-insulating resilient polyimide nanofiber airgel and a preparation method thereof. Although the airgel in the method also has good thermal insulation properties, the airgel The structure is easily damaged under the action of thermal stress in an extreme temperature environment, thus losing the ability of thermal insulation

Method used

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  • Heat insulation polyimide nanofiber aerogel and preparation method thereof
  • Heat insulation polyimide nanofiber aerogel and preparation method thereof
  • Heat insulation polyimide nanofiber aerogel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1. Using N,N-dimethylacetamide as a solvent, the solid content of 15% polyamic acid to obtain a polyamic acid mixed solution. 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 react in an ice-water bath for 5h. A polyamic acid solution is prepared. Add the prepared polyamic acid mixed solution into a syringe, and perform electrospinning to obtain a polyamic acid nanofiber membrane.

[0033] 2. Using N,N-dimethylacetamide as a solvent, the solid content of 15% polyamic acid. 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 react in an ice-water bath for 5 hours. Then, 4.0476 g of triethylamine was added, and the reaction was continued for 5 h to prepare a water-soluble polyamic acid solution with a solid content of 15%. The prepared water-so...

Embodiment 2

[0036]The difference between this example and Example 1 is that the mass ratio of the polyamic acid nanofiber membrane to the water-soluble polyamic acid is 2:1. That is, take 50mL of deionized water, 0.8g of nanofiber membrane, 0.4g of water-soluble polyamic acid, and 0.4g of triethylamine and mix them uniformly. After freeze-drying and thermal imidization, the polyimide nanofiber airgel was obtained, which was designated as PI2-1.

Embodiment 3

[0038] The difference between this example and Example 1 is that the mass ratio of the polyamic acid nanofiber membrane to the water-soluble polyamic acid is 2:1. That is, take 50mL of deionized water, 0.96g of nanofiber membrane, 0.24g of water-soluble polyamic acid, and 0.24g of triethylamine and mix them uniformly. After freeze-drying and thermal imidization, the polyimide nanofiber airgel was obtained, which was designated as PI4-1.

[0039] The electron microscope picture of the polyimide nanofiber airgel prepared by embodiment 1-3, as figure 1 shown;

[0040] The thermal insulation infrared thermal imaging of the polyimide nanofiber airgel prepared in Example 2 at high temperature, such as figure 2 As shown, it can be seen that the aerogel still has good heat insulation ability after being placed on a hot stage at 300°C for 20 minutes;

[0041] The thermal insulation infrared thermal imaging of the polyimide nanofiber airgel prepared in Example 2 at a low temperatur...

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Abstract

The invention relates to a heat insulation polyimide nanofiber aerogel and a preparation method thereof. The heat insulation polyimide nanofiber aerogel is prepared from the raw material components ofpolyamide acid nanofibers and water soluble polyamide acid, wherein the mass ratio of the polyamide acid nanofibers to the water soluble polyamide acid is (1-5) to 1. According to the heat insulationpolyimide nanofiber aerogel, the good compression returning performance is achieved, the heat conductivity coefficient is low, the good heat insulation capability is still achieved under the high temperature and compression, the combination property is excellent, the preparation process is simple and easy to operate, environmental protection is achieved, and the insulation polyimide nanofiber aerogel can be used in various heat insulation scenes.

Description

technical field [0001] The invention belongs to the field of thermal insulation materials and preparation thereof, in particular to a thermal insulation polyimide nanofiber airgel and a preparation method thereof. Background technique [0002] Airgel is a continuous three-dimensional skeleton network structure composed of solid particles, and the dispersed phase is a highly dispersed solid material of gas. With the characteristics of low density, high specific surface area and low thermal conductivity, it has broad prospects in aerospace, petrochemical, automobile industry, building insulation and other fields. [0003] Airgel has ultra-low thermal conductivity and excellent thermal insulation properties. Therefore, aerogels have great application prospects in many fields such as construction, automobiles, aerospace, household appliances, petrochemical plants, and outdoor sports. However, for practical applications, aerogels are required to have other properties besides lo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/28C08L79/08
CPCC08J9/286C08J2201/0484C08J2205/026C08J2379/08C08J2479/08
Inventor 樊玮赵兴宇刘天西杨帆薛甜甜张翔
Owner DONGHUA UNIV
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