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Low reflection and high shielding electromagnetic shielding composite material with gradient structure and its preparation

A composite material and gradient structure technology, applied in the direction of magnetic/electric field shielding, electrical components, etc., can solve problems such as secondary pollution, and achieve the effect of ensuring high efficiency, effective absorption, and optimized process

Active Publication Date: 2020-12-25
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Improving the conductivity of electromagnetic shielding composite materials is an effective means to achieve high shielding effectiveness, [Jun Li et al.J.Mater.Chem.C,2017,5,1095; Yu Xu et al.ACSAppl.Mater.Interfaces, 2016,8,24131; Fang Fang et al.J.Mater.Chem.C,2016,4,4193] However, higher conductivity tends to cause a large amount of incident electromagnetic waves to reflect on the surface of the shielding material, causing secondary pollution

Method used

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  • Low reflection and high shielding electromagnetic shielding composite material with gradient structure and its preparation
  • Low reflection and high shielding electromagnetic shielding composite material with gradient structure and its preparation
  • Low reflection and high shielding electromagnetic shielding composite material with gradient structure and its preparation

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Embodiment 1

[0030] Embodiment one: the preparation method of water-based polyurethane / graphene loaded ferric oxide nanoparticles / tetragonal acicular zinc oxide whisker nanoparticles loaded silver electromagnetic shielding film, comprising the following steps:

[0031] (1) preparation of graphene-supported ferric oxide nanoparticles, including:

[0032] Weigh 20ml of graphene oxide dispersion (20mg graphene oxide), ultrasonically disperse for 30min; dissolve 90mg of ferric chloride and 60mg of ferrous sulfate in water, add to the graphene oxide dispersion; place the mixture at 50°C In a water bath, add 2ml of ammonia water dropwise, react for 2h, add 2ml of hydrazine hydrate, and react for 8h to obtain graphene-loaded ferric oxide nanoparticles.

[0033] (2) Preparation of tetragonal acicular zinc oxide whisker nanoparticles loaded silver nanoparticles, including:

[0034] Sensitization: add tetragonal acicular zinc oxide whisker nanoparticles to 100ml of sensitization solution, ultrasoni...

Embodiment 2

[0043] Embodiment two: the preparation method of water-based polyurethane / graphene loaded ferric oxide nanoparticles / tetragonal acicular zinc oxide whisker nanoparticles loaded silver electromagnetic shielding film, comprising the following steps:

[0044] (1) preparation of graphene-supported ferric oxide nanoparticles, including:

[0045] Weigh 40ml of graphene oxide dispersion (40mg graphene oxide), ultrasonically disperse for 30min; dissolve 60mg of ferric chloride and 40mg of ferrous sulfate in water, add to the graphene oxide dispersion; place the mixture at 50°C In a water bath, add 2ml of ammonia water dropwise, react for 2h, add 4ml of hydrazine hydrate, and react for 8h to obtain graphene-supported ferric oxide nanoparticles.

[0046] (2) Preparation of tetragonal acicular zinc oxide whisker nanoparticles loaded silver nanoparticles, including:

[0047] Sensitization: add tetragonal acicular zinc oxide whisker nanoparticles to 100ml of sensitization solution, ultras...

Embodiment 3

[0056] Embodiment three: the preparation method of water-based polyurethane / graphene loaded ferric oxide nanoparticles / tetragonal acicular zinc oxide whisker nanoparticles loaded silver electromagnetic shielding film, comprising the following steps:

[0057] (1) preparation of graphene-supported ferric oxide nanoparticles, including:

[0058] Weigh 50ml graphene oxide dispersion (50mg graphene oxide), ultrasonically disperse for 30min; dissolve 120mg ferric chloride and 80mg ferrous sulfate in water, add to graphene oxide dispersion, place the above mixed solution at 50 In a water bath at ℃, add 4ml of ammonia water dropwise, react for 2 hours, add 8ml of hydrazine hydrate, and react for 8 hours to obtain graphene-supported ferric oxide nanoparticles.

[0059] (2) The preparation of tetragonal acicular zinc oxide whisker nanoparticles loaded silver nanoparticles includes:

[0060] Sensitization: add tetragonal acicular zinc oxide whisker nanoparticles to 100ml of sensitizatio...

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Abstract

The invention relates to the field of functional composite materials, in particular to a low-reflection high shielding electromagnetic shielding composite material with a gradient structure and a preparation method of the low-reflection high shielding electromagnetic shielding composite material. The low reflection and high shielding characteristics of the electromagnetic shielding material are achieved by controlling gradient distribution of different filler. Firstly, tetragonal acicular zinc oxide whisker nanoparticles with a special spatial structure and a wave-absorbing property are adopted as carriers, and a metal silver layer is deposited on the surface of the carriers by using a chemical deposition method so as to obtain tetragonal acicular zinc oxide whisker nanoparticles-loaded silver nanoparticles with excellent electrical conductivity and a special spatial structure; graphene-loaded Fe3O4 nanoparticles with balanced electrical conductivity and magnetic performance are prepared by using a co-precipitation method; and finally, blending and casting are performed on the two electrically conductive filler and water-soluble polyurethane which is adopted as a matrix so as to prepare the electromagnetic shielding composite material.

Description

technical field [0001] The invention relates to the field of functional composite materials, in particular to a low-reflection and high-shielding electromagnetic shielding composite material with a gradient structure and a preparation method thereof. Background technique [0002] With the rapid development of the modern electronic industry, electronic appliances and radio communications have been widely used, and electromagnetic radiation has become another major public hazard after noise pollution, air pollution, water pollution, and solid waste pollution. Electromagnetic waves not only interfere with the normal operation of various electronic equipment, threaten the information security of communication equipment, but also cause great harm to human health. At present, the main method to eliminate the hazards of electromagnetic waves is to use electromagnetic shielding materials to shield them. Therefore, exploring efficient electromagnetic shielding materials has become a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L75/04C08K13/06C08K9/12C08K3/04C08K3/22C08K7/00C08K7/08C08K3/08C08J5/18H05K9/00
CPCC08J5/18C08J2375/04C08K3/04C08K7/00C08K7/08C08K9/12C08K13/06C08K2003/0806C08K2003/2275C08K2201/011H05K9/0088
Inventor 刘亚青段宏基许亚东杨雅琦赵贵哲
Owner ZHONGBEI UNIV
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