Thermal-insulation anisotropic polyimide nanofiber aerogel and preparation method thereof

A nanofiber and polyimide technology is applied in the field of polyimide nanofiber aerogel and its preparation, and achieves the effects of reducing quality, wide application prospect, and convenient and efficient preparation method.

Inactive Publication Date: 2019-08-23
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the existing aerogels are prepared directly in a cold atmosphere or directly by supercritical drying. Although this type of aerogel has good formability, its thermal conductivity is still high, and its thermal insulation ability is still limited. Large room for improvement

Method used

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  • Thermal-insulation anisotropic polyimide nanofiber aerogel and preparation method thereof
  • Thermal-insulation anisotropic polyimide nanofiber aerogel and preparation method thereof
  • Thermal-insulation anisotropic polyimide nanofiber aerogel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] This embodiment provides a heat-insulating anisotropic polyimide nanofiber airgel, and its preparation steps are as follows:

[0035] Step 1): 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 to prepare A polyamic acid spinning solution with a solid content of 15% was obtained, and the prepared polyamic acid spinning solution was added to a syringe for electrospinning. The speed is 0.03-0.07cm / min, and the temperature is 25°C. , to obtain polyamic acid nanofibers;

[0036] Step 2): Dissolve 8.0096g of 4,4'-diaminodiphenyl ether in 95.57g of N,N-dimethylacetamide, add 8.8556g of pyromellitic dianhydride, react in an ice-water bath for 5h, and then Add 4.0476g triethylamine, continue to react for 5h, and prepare the water-soluble polyamic acid solution that the solid content is 15%; The prepared water-soluble polyamic acid solution is precipitated with deioni...

Embodiment 2

[0041] The difference between this example and Example 1 is that the total solid content of polyamic acid nanofibers and water-soluble polyamic acid is 15 mg / mL. That is, take 0.375g of nanofiber membrane, 0.375g of water-soluble polyamic acid, and 0.375g of triethylamine into 50mL of deionized water, disperse with a disperser, and then place the obtained dispersion in a mold and bidirectionally freeze in a constant temperature reaction bath , after freeze-drying and thermal imidization, a heat-insulating anisotropic polyimide nanofiber airgel was obtained, denoted as PI-15.

Embodiment 3

[0043] The difference between this example and Example 1 is that the total solid content of the polyamic acid nanofiber membrane and the water-soluble polyamic acid is 20 mg / mL. That is, take 0.5g of nanofiber membrane, 0.5g of water-soluble polyamic acid, and 0.5g of triethylamine into 50mL of deionized water, disperse with a disperser, and then place the obtained dispersion in a mold and freeze it in a constant temperature reaction bath. After freeze-drying and thermal imidization, a heat-insulating anisotropic polyimide nanofiber airgel is obtained, which is designated as PI-20.

[0044] figure 1 For the heat-insulating anisotropic polyimide nanofiber airgel scanning electron micrograph prepared in Example 2, it can be seen that the obvious fiber connection parallel sheet structure in the sample;

[0045] figure 2 The data graph of the axial and radial thermal conductivity of the heat-insulating anisotropic polyimide nanofiber airgel prepared for Examples 1-3 shows that ...

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Abstract

The invention discloses a preparation method of a thermal-insulation anisotropic polyimide nanofiber aerogel. The preparation method comprises the following steps: 1) preparing a polyamide acid spinning solution, and electrospinning the polyamide acid spinning solution to prepare polyamide acid nanofibers; 2) uniformly mixing the polyamide acid nanofibers obtained in step 1), water-soluble polyamide acid and an organic amine in water, and performing dispersion to obtain a uniform dispersion of the polyamide acid nanofibers and water-soluble polyamide acid; 3) placing the dispersion obtained instep 2) in a mold, performing bidirectional refrigeration in a constant-temperature reaction bath, and drying the refrigerated dispersion in a freeze dryer; and 4) carrying out thermal imidization ona sample obtained in step 3) in a tubular furnace to obtain the thermal-insulation anisotropic polyimide nanofiber aerogel. The polyimide nanofiber aerogel of the invention has the advantages of goodcompression resilience, low radial thermal conduction coefficient and excellent comprehensive performances, and can be used in various thermal insulation scenes.

Description

technical field [0001] The invention relates to the field of thermal insulation materials, in particular to a polyimide nanofiber airgel with thermal insulation anisotropy and a preparation method thereof. Background technique [0002] Airgel is 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 application 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 low thermal conductivity. For example, in the field of ...

Claims

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Application Information

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