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Low-reflectivity high-shielding gradient structure foam material

A foam material, gradient structure technology, applied in layered products, metal layered products, chemical instruments and methods, etc., can solve the problems of secondary pollution of electromagnetic waves, impedance mismatch, etc., to reduce electromagnetic wave reflection, conductivity and electromagnetic waves. Stable shielding performance and good reproducibility

Active Publication Date: 2019-04-09
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, building a conductive network with high conductivity is not a perfect solution for designing ideal shielding materials. High conductivity also means that the impedance mismatch between electromagnetic waves and shielding materials is more serious, which in turn will reflect a large number of electromagnetic waves and cause secondary pollution.

Method used

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  • Low-reflectivity high-shielding gradient structure foam material
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment one: the preparation method of water-based polyurethane / graphene loaded ferric oxide nanoparticles / carbon nanotubes / square needle-shaped zinc oxide whisker nanoparticles loaded silver electromagnetic shielding composite foam material, comprising the following steps:

[0030] (1) preparation of graphene-supported ferric oxide nanoparticles, including:

[0031] 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.

[0032] (2) The tetragonal acicular zinc oxide whisker-loaded silver nanoparticles were prepared by chemical deposition method, wherein the silver content was 50wt%, and the conductivity of the nanoparticles wa...

Embodiment 2

[0038] Embodiment two: the preparation method of water-based polyurethane / graphene loaded ferric oxide nanoparticles / carbon nanotubes / square needle-shaped zinc oxide whisker nanoparticles loaded silver electromagnetic shielding composite foam material, comprising the following steps:

[0039] (1) preparation of graphene-supported ferric oxide nanoparticles, including:

[0040] 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.

[0041] (2) The tetragonal acicular zinc oxide whisker-loaded silver nanoparticles were prepared by chemical deposition method, wherein the silver content was 50wt%, and the conductivity of the nanoparticles wa...

Embodiment 3

[0047] Embodiment three: the preparation method of water-based polyurethane / graphene loaded ferric oxide nanoparticles / carbon nanotubes / square needle-shaped zinc oxide whisker nanoparticles loaded silver electromagnetic shielding composite foam material, comprising the following steps:

[0048] (1) preparation of graphene-supported ferric oxide nanoparticles, including:

[0049] 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.

[0050] (2) The tetragonal acicular zinc oxide whisker-loaded silver nanoparticles were prepared by chemical deposition method, wherein the silver content was 50wt%, and the conductivity of the nanoparticles ...

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Abstract

The invention relates to the field of functional composite materials, in particular to a low-reflectivity high-shielding gradient structure foam material and a preparation method thereof. A low-reflectivity high-shielding function of an electromagnetic shielding foam material is achieved by preparing a foam material with different filler through the gradient structure. The low-reflectivity high-shielding gradient structure foam material is prepared by the following steps: preparing graphene loaded ferroferric oxide nanoparticle foam and carbon nanotube foam with oriented foam structures by taking ice crystals as a template separately by means of a liquid nitrogen freeze-drying method; preparing a quadrangle needle-like zinc oxide whisker nanoparticle loaded silver film by blending, pouringand drying; and finally, compounding the three through an adhesive to obtain the electromagnetic shielding foam with the gradient laminar structure. Under the circumstance of reducing reflection of electromagnetic waves effectively, the conductivity and the electromagnetic shielding performance of the compound foam material can be improved obviously, and a target of high conductivity, low reflectivity and high electromagnetic shielding efficiency of the compound foam material is achieved.

Description

technical field [0001] The invention relates to the field of functional composite materials, in particular to a gradient structural foam material with low reflection and high shielding properties. Background technique [0002] With the rapid development of the electronics industry, electromagnetic radiation is also becoming more and more serious, which in turn causes a series of negative effects (electromagnetic interference between equipment, information security, and human hazards). Therefore, it is very important to explore new high-efficiency electromagnetic shielding materials. [0003] Current research shows that improving the conductivity of shielding materials is an effective strategy to achieve high shielding performance shielding materials. For example, 2D transition metal carbides (MXenes) have been employed by researchers as a promising alternative to graphene for achieving superior EMI shielding effectiveness as shielding materials. Because of its ultra-high c...

Claims

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Application Information

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IPC IPC(8): B32B9/00B32B9/04B32B5/18B32B5/32B32B15/04B32B7/12B32B33/00C08L75/04C08K9/12C08K3/04C08K3/22C08K7/08C08K3/08C08J9/28
CPCB32B5/18B32B5/32B32B7/12B32B9/00B32B9/046B32B15/046B32B33/00B32B2250/03B32B2266/04B32B2307/20B32B2307/202B32B2307/212C08J9/0071C08J9/009C08J9/28C08J2201/0484C08J2375/04C08K3/041C08K3/042C08K7/08C08K9/12C08K2003/0806C08K2003/2275C08K2201/011
Inventor 杨雅琦许亚东盛安刘亚青段宏基赵贵哲
Owner ZHONGBEI UNIV
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