ANFs/MXene composite electromagnetic shielding aerogel and preparation method thereof

A composite electromagnetic and shielding gas technology, applied in the fields of magnetic field/electric field shielding, electrical components, etc., can solve the problems of inapplicability and easy collapse of aerogels

Pending Publication Date: 2022-05-20
EAST CHINA UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the airgel obtained by the above preparation method is easy to collapse under high temperature, flame burning and other environments, and cannot be applied to the shielding requirements under extreme conditions such as aerospace and military.

Method used

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  • ANFs/MXene composite electromagnetic shielding aerogel and preparation method thereof
  • ANFs/MXene composite electromagnetic shielding aerogel and preparation method thereof
  • ANFs/MXene composite electromagnetic shielding aerogel and preparation method thereof

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preparation example Construction

[0030] The invention provides a preparation method of ANFs / MXene composite electromagnetic shielding airgel, comprising the following steps:

[0031] (1) mixing polar organic solvents, Kevlar 29 fibers and hydroxides of alkali metals to obtain ANFs colloids; the Kevlar 29 fibers are dried before use; the mixing conditions are vacuum;

[0032] (2) adding water dropwise to the ANFs colloid obtained in step (1), and then performing suction filtration and washing successively to obtain the ANFs precursor film;

[0033] (3) Add the MXene dispersion liquid dropwise on the surface of the ANFs precursor film obtained in step (2), and then pulverize after standing to obtain a mixed gel precursor;

[0034] (4) The gel precursor obtained in step (3) was subjected to directional freezing, and then freeze-dried to obtain ANFs / MXene composite electromagnetic shielding airgel.

[0035] The invention mixes polar organic solvent, Kevlar 29 fiber and alkali metal hydroxide to obtain ANFs collo...

Embodiment 1

[0061] (1) Preparation of ANFs: Kevlar 29 chopped fibers are pretreated, and Kevlar 29 chopped fibers are dried in a vacuum oven at 120°C for 12 hours to completely remove moisture;

[0062] Add 1000mL dimethyl sulfoxide, 2g Kevlar29 chopped fiber and 3g potassium hydroxide to the dry flask in turn, pump the vacuum 3 times to remove the air, ensure an anhydrous environment, stir for 7 days, and obtain a uniformly dispersed 2mg / ml ANFs colloid.

[0063] (2) Preparation of MXene dispersion: take 400 mesh 1g of Ti 3 AlC 2 Put it into a polytetrafluoroethylene reactor with a stirring rod, slowly add a mixture of 1g of LiF and 20ml of HCl with a concentration of 9mol / L to the reactor, and after the addition is completed within 15min, at a stirring rate of 550r / min, React for 24 hours at a temperature of 35°C; wash the product with deionized water until pH>6, then centrifuge, add the lower layer product to the gas washing bottle, add 60ml of deionized water at the same time, pass i...

Embodiment 2

[0071] (1) Preparation of ANFs: Kevlar 29 chopped fibers are pretreated, and Kevlar 29 chopped fibers are dried in a vacuum oven at 120°C for 12 hours to completely remove moisture;

[0072] Add 800mL dimethyl sulfoxide, 2g of Kevlar 29 chopped fiber and 3g of potassium hydroxide to a completely dry flask in turn, pump vacuum 3 times to remove air, ensure anhydrous environment, stir for 7 days, and obtain evenly dispersed 2.5 mg / ml ANFs colloid.

[0073] (2) Preparation of MXene dispersion: take 400 mesh 1g of Ti 3 AlC 2 Put it into a polytetrafluoroethylene reactor with a stirring rod, slowly add a mixture of 1g of LiF and 20ml of HCl with a concentration of 9mol / L to the reactor, and after the addition is completed within 15min, at a stirring rate of 550r / min, React for 24 hours at a temperature of 35°C; wash the product with deionized water until pH>6, then centrifuge, add the lower layer product to the gas washing bottle, add 60ml of deionized water at the same time, pas...

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Abstract

The invention relates to the technical field of electromagnetic shielding composite materials, and provides a preparation method of ANFs/MXene composite electromagnetic shielding aerogel. The selected Kevlar29 fiber has a specific length-diameter ratio and strength, and under the combined action of the alkali metal hydroxide and the polar solvent, the Kevlar29 fiber is stripped into ANFs colloid; the moisture in the ANFs colloid preparation process is strictly controlled, so that the surface active groups of the peeled ANFs are enriched to the maximum extent, and the mechanical property and electromagnetic wave absorption property of the aerogel are improved; by adopting a directional freezing mode, the ANFs aerogel with a multi-level pore structure and macroscopic height orientation is obtained, the compression resilience performance of the aerogel is improved, the orientation structure of the ANFs aerogel enables MXene conductive phases to be directionally arranged, the conductivity performance of the aerogel is improved, and a rigid framework of the highly-oriented ANFs aerogel can bear larger external force.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic shielding composite materials, and in particular relates to an ANFs / MXene composite electromagnetic shielding airgel and a preparation method thereof. Background technique [0002] With the rapid development of aerospace technology and information warfare, in order to cope with the complex electromagnetic wave environment, there is an urgent need for electromagnetic shielding materials with small size and light weight to meet the electromagnetic shielding requirements in extreme environments. Compared with the highly reflective properties of traditional metal materials, airgel is a porous material with ultra-light and low-density properties. At the same time, due to the rich inner cavity, it can absorb the incident electromagnetic wave and convert it into heat energy, which is crucial for improving the performance of shielding materials. Aramid nanofibers (ANFs) and MXene are the main raw...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/28C08L77/10C08K3/14H05K9/00
CPCC08J9/28H05K9/0083C08J2205/026C08J2377/10C08J2201/0482C08K3/14
Inventor 庄启昕杜亦谦徐健姜军豪李金鹏方江宇左沛元刘小云
Owner EAST CHINA UNIV OF SCI & TECH
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