Kevlar aerogel film, and preparation method and application thereof

A Kevlar gel and aerogel technology, which is applied in the field of nanoporous materials, can solve the problems of long preparation period, difficult to realize industrialization, and incapable of continuous large-scale preparation, and achieves high porosity, easy continuous, The effect of good flexibility

Inactive Publication Date: 2019-04-12
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

CN106977763A discloses a method for preparing Kevlar airgel membrane by vacuum filtration method, but the preparation cycle of the suction filtration method is long, and it cannot be prepared continuously and on a large scale, so it is difficult to realize industrialization

Method used

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  • Kevlar aerogel film, and preparation method and application thereof
  • Kevlar aerogel film, and preparation method and application thereof
  • Kevlar aerogel film, and preparation method and application thereof

Examples

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preparation example Construction

[0024] Another aspect of the embodiments of the present invention also provides a method for preparing a Kevlar aerogel film, comprising:

[0025] (1) Dissolving macroscopic Kevlar fibers to form Kevlar nanofiber sol;

[0026] (2) coating the Kevlar nanofiber sol on a substrate, transferring it to a coagulation bath, and replacing it with a solvent to form a Kevlar gel film;

[0027] (3) drying the Kevlar gel film to obtain a Kevlar aerogel film.

[0028] In a more preferred embodiment, step (1) can specifically include: adding Kevlar fiber to potassium hydroxide, potassium tert-butoxide or other strong alkaline substances in a mass ratio of 1:0.2~1:1 to polar Among the solvents, polar solvents include but are not limited to dimethyl sulfoxide, magnetic stirring at a certain temperature (20 ~ 70 ° C), until a uniform dispersion is formed, according to different needs, prepare 0.1wt% ~ 10.0wt% respectively of Kevlar nanofiber sols.

[0029] In a more preferred embodiment, in...

Embodiment 1

[0048] Add 2.0 g of Kevlar fiber and 0.4 g of potassium hydroxide to the sample bottle, then add 98.0 g of dimethyl sulfoxide, close the bottle cap tightly, and stir magnetically at 25°C until a uniform dispersion is formed; The droplets were added to the glass slide, and the spin coater was used for spin coating for 30 s, and the spin coating speed was 500 rpm; the sample after spin coating was quickly transferred to deionized water, and after gelation, the Kevlar hydrogel film fell off the glass slide substrate. Solvent replacement of the above hydrogel with absolute ethanol followed by supercritical CO 2 After drying, a flexible self-supporting Kevlar aerogel film was obtained. Figure 1a The SEM photograph of the Kevlar aerogel film obtained in this example is shown, and other parameters are shown in Table 1.

Embodiment 2

[0050] Add 2.0g Kevlar fiber and 1.0g potassium hydroxide to the sample bottle, then add 98.0g dimethyl sulfoxide, close the bottle cap tightly, and stir magnetically at 20°C until a uniform dispersion is formed; The droplets were added to the glass slide, and the spin coater was used for spin coating for 30 s, and the spin coating speed was 1000 rpm; the sample after spin coating was quickly transferred to anhydrous ethanol, and after gelation, the Kevlar gel film fell off the glass slide substrate. , supercritical CO 2 After drying, a flexible and self-supporting Kevlar aerogel film was obtained. Figure 1b The SEM photograph of the Kevlar aerogel film obtained in this example is shown, and other parameters are shown in Table 1.

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Abstract

The invention discloses a Kevlar aerogel film, and a preparation method and application thereof. The Kevlar aerogel film has a communicating three-dimensional network-like porous structure formed by mutual overlapping of Kevlar nanofibers. The preparation method comprises: dissolving Kevlar fibers to form a Kevlar nanofiber sol; applying the Kevlar nanofiber sol to a substrate, and then transferring the substrate to a coagulation bath, and performing a sol-gel process and a subsequent solvent replacement process to form a Kevlar gel film; and finally, conducting drying to obtain the Kevlar aerogel film. The Kevlar aerogel film of the invention has high specific surface area and porosity, good flexibility, thermal stability and chemical stability, and the preparation process is simple, andis easy for continuous large-scale production. The Kevlar aerogel film can be directly used as a dielectric material, a sound insulation material, a heat insulation material, a filter film material, etc., and can also be used as a substrate of a flexible functional composite material.

Description

technical field [0001] The invention relates to a novel aerogel film, in particular to a flexible self-supporting Kevlar aerogel film, a preparation method and application thereof, and belongs to the technical field of nanoporous materials. Background technique [0002] Aerogel materials are lightweight and porous nanomaterials. The preparation process usually requires supercritical drying or freeze drying to replace the liquid in the wet gel with gas without significantly changing the network structure of the gel, so it has a specific surface area. Large, high porosity, low thermal conductivity, low density and other unique properties. Aerogel was born in 1931. With the rapid development of science and technology, a variety of high-performance aerogel materials continue to emerge, which have shown attractive application prospects in the fields of environmental protection, energy storage and conversion, and biomedicine. Traditional aerogel materials are mostly bulk or powde...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/28C08J5/18C08L77/10
CPCC08J5/18C08J9/28C08J2205/026C08J2377/10
Inventor 张学同吕婧
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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