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A graphene/magnetic particle/polyaniline composite porous wave-absorbing material and a preparing method thereof

A technology of magnetic particles and wave-absorbing materials, applied in chemical instruments and methods, other chemical processes, etc., can solve the problems of reducing the density of absorbents, difficult to disperse, easy to agglomerate, etc., to overcome the problems of high density, strong electromagnetic wave absorption and absorption The effect of bandwidth

Inactive Publication Date: 2017-03-22
CHENGDU YUYA TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there are many reports on the use of magnetic metal powder and conductive polymer as electromagnetic wave absorber, but there are few reports on graphene as absorber, especially the composite of graphene, polyaniline and nano-scale metal powder with magnetic loss characteristics. The multi-component composite material made can not only reduce the density of the absorbent, but also broaden the absorption frequency band and improve the absorption effect, but there are common problems that graphene and magnetic particles are difficult to disperse and easy to agglomerate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The graphene / magnetic particle / polyaniline composite porous wave-absorbing material is composed of the following components in mass percentage: 5wt% graphene, 5wt% magnetic particles, 89wt% polyaniline, and 1wt% foaming agent.

[0020] The graphene is a nanoscale sheet structure.

[0021] The magnetic particles are hollow iron ferric oxide particles with a particle size of 50-100nm.

[0022] The blowing agent is N,N-dinitrosopentamethylenetetramine.

[0023] The preparation method of graphene / magnetic particles / polyaniline composite porous wave-absorbing material comprises the following steps:

[0024] (1) Preparation of graphene: Add concentrated sulfuric acid to the multi-walled carbon nanotubes with a diameter of 30-50nm and let it stand for 18 hours, then add potassium permanganate, stir at room temperature for 1 hour, ultrasonicate at 50°C for 0.5 hours, and then heat up to Continue ultrasonic treatment at 70-80°C for 0.5h, pour into 1.0L ice water after cooling ...

Embodiment 2

[0029] The graphene / magnetic particle / polyaniline composite porous absorbing material is composed of the following components in mass percentage: 30wt% graphene, 20wt% magnetic particles, 45wt% polyaniline, and 5wt% foaming agent.

[0030] The graphene is a nanoscale sheet structure.

[0031] The magnetic particles are flaky carbonyl iron powder with a particle size of 50-100nm.

[0032] The blowing agent is selected from N, N-dinitrosopentamethylenetetramine, N, N-dimethyl-N, N-dinitroso terephthalamide, azobisisobutyronitrile , A mixture of diisopropyl azodicarboxylate.

[0033] The preparation method of graphene / magnetic particles / polyaniline composite porous wave-absorbing material comprises the following steps:

[0034](1) Preparation of graphene: Add concentrated sulfuric acid to the multi-walled carbon nanotubes with a diameter of 30-50nm and let it stand for 24 hours, then add potassium permanganate, stir at room temperature for 1 hour, ultrasonicate at 60°C for 1 ho...

Embodiment 3

[0039] The graphene / magnetic particle / polyaniline composite porous wave-absorbing material is composed of the following components in mass percentage: 25wt% graphene, 17wt% magnetic particles, 55wt% polyaniline, and 3wt% foaming agent.

[0040] The graphene is a nanoscale sheet structure.

[0041] The magnetic particles are selected from the mixture of M-type hexagonal strontium ferrite powder and spherical iron ferric oxide particles, and the particle size is 50-100nm.

[0042] The foaming agent is selected from diazaminobenzene, barium azodicarboxylate, 4,4'-disulfonyl hydrazide diphenyl ether, p-benzenesulfonyl hydrazide, 3,3'-disulfonyl hydrazide diphenyl sulfone , 4,4'-diphenyldisulfonyl hydrazide, 1,3-benzenedisulfonyl hydrazide, 1,4-benzenedisulfonyl hydrazide in the mixture.

[0043] The preparation method of graphene / magnetic particles / polyaniline composite porous wave-absorbing material comprises the following steps:

[0044] (1) Preparation of graphene: Add concen...

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Abstract

A graphene / magnetic particle / polyaniline composite porous wave-absorbing material and a preparing method thereof are disclosed. The composite porous wave-absorbing material comprises, by mass, 5-30 wt% of graphene, 5-20 wt% of magnetic particles, 45-90 wt% of polyaniline and 1-5 wt% of a foaming agent. The composite porous wave-absorbing material is prepared by loading the graphene sheet surfaces with the magnetic particles by a solvothermal method, cladding the graphene sheet surfaces loaded with the magnetic particles with the polyaniline through an in-situ polymerization process, performing heating and foaming by using the foaming agent, and performing high-temperature carbonization. The material has characteristics of a low cost, a simple preparing process, high electromagnetic wave absorption capability, a wide absorption bandwidth, and the like, and has a wide application prospect in sensing techniques, electromagnetic shielding, radar absorption, and other wave-absorbing fields.

Description

technical field [0001] The invention relates to the field of preparation of electromagnetic wave absorbing materials, in particular to a graphene / magnetic particle / polyaniline composite porous wave absorbing material and a preparation method thereof. Background technique [0002] Graphene material has a large specific surface area and excellent electrical properties, showing great application prospects in electronics, sensors, new energy materials and devices, optics, biomedicine and many other fields; polyaniline is the most commonly used conductive polymer Graphene has many special properties as a two-dimensional material, and the composite material of the two has good wave-absorbing properties. With the development of science and technology, the hazards of electromagnetic wave pollution are becoming more and more serious, and the requirements for electromagnetic shielding in military and civilian fields are also increasing. The research of high-performance absorbing mater...

Claims

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Application Information

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IPC IPC(8): C08G73/02C08K9/12C08K7/00C08K3/04C08K7/24C08K3/18C08K7/18C08J9/10C09K3/00C08L79/02
CPCC08G73/0266C08J9/102C08J9/105C08J9/107C08J9/108C08J2203/04C08J2379/02C08K3/04C08K3/18C08K7/00C08K7/18C08K7/24C08K9/12C08K2201/003C08K2201/011C09K3/00
Inventor 向红先
Owner CHENGDU YUYA TECH
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