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A kind of flexible absorbing composite material and preparation method thereof

A composite material and flexible technology, which is applied in the field of preparation of flexible wave-absorbing composite materials, can solve the problems of poor bonding strength, poor dispersion and poor effect of ferrite and polymer, and achieve the promotion of development, mechanical properties and high temperature resistance. Excellent, easy-to-operate effect

Active Publication Date: 2022-03-08
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the poor bonding strength and dispersion of ferrite and polymer, the effect of direct doping is not good

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Preparation of filled expanded graphite:

[0019] First, add gallium-indium liquid metal and ferrite powder with a mass ratio of 2:1 to the beaker, continue stirring at 20°C for 20 minutes, and then ultrasonicate at 20°C for 20 minutes; : Gallium-based liquid metal = expanded graphite at a ratio of 1:100, use a glass rod for preliminary mixing, then add 0.2mol / L sodium hydroxide solution that can submerge the mixture in the beaker, continue stirring for 20min, and then use ultrasonic waves to vibrate at 20°C 30min, after the ultrasonic wave is over, place the beaker in a water bath at 20°C and let it stand for 6 hours; after the standstill, put the mixed liquid in the beaker into a centrifuge, and use absolute ethanol to centrifugally wash the mixed liquid. When ethanol does not contain gallium-based liquid metal, take out the remaining material from the centrifuge, and dry it at 60°C for 5 hours to obtain filled expanded graphite;

[0020] (2) Preparation of flexi...

Embodiment 2

[0023] (1) Preparation of filled expanded graphite:

[0024] First, add gallium-indium liquid metal and ferrite powder with a mass ratio of 3:1 to the beaker, continue stirring at 30°C for 30 minutes, and then ultrasonicate at 30°C for 30 minutes; after the ultrasonic treatment, add expanded graphite with a mass ratio of : Gallium-based liquid metal = expanded graphite at a ratio of 1:200, use a glass rod for preliminary mixing, then add 0.3mol / L sodium hydroxide solution that can submerge the mixture in the beaker, continue stirring for 30min, and then use ultrasonic waves to vibrate at 30°C After 40 minutes of ultrasonication, place the beaker in a water bath at 30°C for 8 hours; after standing, put the mixed liquid in the beaker into a centrifuge, and use absolute ethanol to centrifugally wash the mixed liquid. When ethanol does not contain gallium-based liquid metal, take out the remaining material from the centrifuge, and dry it at 60°C for 7 hours to obtain filled expand...

Embodiment 3

[0028] (1) Preparation of filled expanded graphite:

[0029] First add gallium-indium-tin liquid metal and ferrite powder with a mass ratio of 4:1 to the beaker, stir continuously at 40°C for 30min, and then ultrasonicate at 40°C for 30min; Expanded graphite: gallium-based liquid metal = 1:400 expanded graphite, use a glass rod for preliminary stirring and mixing, then add 0.5mol / L sodium hydroxide solution that can immerse the mixture in the beaker, continue stirring for 30min, and then use ultrasonic waves at 50°C After the ultrasonic wave, put the beaker in a water bath at 50°C for 10 hours; put the mixed liquid in the beaker into a centrifuge, and use absolute ethanol to centrifugally wash the mixed liquid. When there is no gallium-based liquid metal in absolute ethanol, take out the remaining material from the centrifuge, and dry it at 70°C for 9 hours to obtain filled expanded graphite;

[0030] (2) Preparation of flexible wave-absorbing composite materials:

[0031] F...

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PUM

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Abstract

The invention discloses a preparation method of a flexible wave-absorbing composite material. The method first mixes gallium-based liquid metal and ferrite wave-absorbing powder, and then fills them into the pores of expanded graphite to obtain filled expanded graphite; then makes polyvinylidene fluoride, a solvent and additives into a solution, and then adds Fill expanded graphite to obtain a composite casting solution; finally, evenly scrape the composite casting solution on the support, put it in a deionized hydrogel bath, and obtain gallium-based liquid metal / ferrite by lysotropic phase inversion / expanded graphite / tetraacicular zinc oxide whisker / polyvinylidene fluoride flexible wave-absorbing composite material. The invention has the advantages of simple procedure, convenient operation and low cost. The composite material prepared by applying the invention has the advantages of excellent flexibility, wave-absorbing performance, hydrophobicity, wear resistance, mechanical performance and high-temperature resistance, and has good engineering application prospects in the fields of electromagnetic protection and stealth.

Description

technical field [0001] The invention relates to a preparation method of a flexible wave-absorbing composite material, in particular to a preparation method of a gallium-based liquid metal / ferrite / expanded graphite / tetraacicular zinc oxide whisker / polyvinylidene fluoride flexible wave-absorbing composite material method. Background technique [0002] With the rapid development of electronic information technology, electromagnetic waves have been widely used in various fields, but they have also produced many negative effects. Electromagnetic waves in the environment will cause electromagnetic pollution, interfere with the normal operation of the electromagnetic system of equipment, and the digital transmission system Electromagnetic radiation can lead to information leakage; at the same time, electromagnetic radiation may also have direct or indirect adverse effects on human health. Electromagnetic wave absorbing materials are often used in electromagnetic protection. The wa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/18C08L27/16C08K3/08C08K7/24C08K7/08C08K3/22C08K13/04
CPCC08J5/18C08J2327/16C08K13/04C08K3/08C08K7/24C08K7/08C08K2003/2265
Inventor 左镇金鑫张之敬肖木峥史玲玲李朝将
Owner BEIJING INSTITUTE OF TECHNOLOGYGY