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Expandable graphite/polyaniline/cobalt ferrite wave-absorbing material and preparation technology thereof

A technology of expanded graphite and cobalt ferrite, applied in the direction of magnetic properties of inorganic materials, can solve problems such as narrow effective bandwidth, and achieve the effect of strong dielectric loss performance, wide absorption frequency band, electrical conductivity and dielectric loss performance improvement.

Inactive Publication Date: 2012-07-25
ZHEJIANG NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The composite material has a reflection loss of -34.4dB in the frequency range of 2-18GHz, but the effective bandwidth is narrow

Method used

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  • Expandable graphite/polyaniline/cobalt ferrite wave-absorbing material and preparation technology thereof
  • Expandable graphite/polyaniline/cobalt ferrite wave-absorbing material and preparation technology thereof
  • Expandable graphite/polyaniline/cobalt ferrite wave-absorbing material and preparation technology thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Expanded graphite / polyaniline / cobalt ferrite ternary composite with cobalt ferrite mass fraction of 0.2

[0035] A preparation of absorbing material

[0036] (1) Weigh 1 to 6 parts of expanded graphite and process them according to steps (1) and (2) to obtain expanded graphite and an ethanol dispersion of expanded graphite;

[0037] (2) Accurately weigh 4-9 parts of aniline (An) and a certain mass of ammonium persulfate (APS) (the molar ratio of An and APS is 1:1 to 1:2) according to step (3) to prepare expanded graphite Expanded graphite / polyaniline binary composite with a mass fraction of 0.1~0.6

[0038] (3) Accurately weigh 1 part of the binary composite of expanded graphite / polyaniline (the mass fraction of expanded graphite is 0.4, the same below), and press it as cobalt ferrite (CoFe 2 O 4 ) And the mass ratio of the expanded graphite / polyaniline composite is 1:4. Weigh 4 parts of Fe(NO 3 ) 3 ·9H 2 O and 3 parts of Co(NO 3 ) 2 ·6H 2 O, according to step (4), an expanded ...

Embodiment 2

[0045] Expanded graphite / polyaniline / cobalt ferrite ternary composite with a mass fraction of cobalt ferrite of 0.3

[0046] A preparation of absorbing material

[0047] (1) Same as step (1) of Example 1;

[0048] (2) Prepare expanded graphite / polyaniline composite according to step 2 of Example 1;

[0049] (3) Accurately weigh 1 part of expanded graphite / polyaniline composite, press cobalt ferrite (CoFe 2 O 4 ) And the mass ratio of expanded graphite / polyaniline is 3:7 Weigh 7 parts of Fe(NO 3 ) 3 ·9H 2 O and 2.5 parts of Co(NO 3 ) 2 ·6H 2 O. Prepare an expanded graphite / polyaniline / cobalt ferrite ternary composite with a cobalt ferrite mass fraction of 0.3 according to the method of Example 1;

[0050] (4) Same as step (4) of Example 1.

[0051] B. Absorption performance test

[0052] The steps are the same as in Example 1.

Embodiment 3

[0054] Expanded graphite / polyaniline / cobalt ferrite ternary composite with a mass fraction of cobalt ferrite of 0.4

[0055] A preparation of absorbing material

[0056] (1) Same as step (1) of Example 1;

[0057] (2) Prepare expanded graphite / polyaniline composite according to step 2 of Example 1;

[0058] (3) Accurately weigh 3 parts of expanded graphite / polyaniline composite, press cobalt ferrite (CoFe 2 O 4 ) And the mass ratio of expanded graphite / polyaniline is 6:9 accurately weigh 31 parts of Fe(NO 3 ) 3 ·9H 2 O and 11.2 parts Co(NO 3 ) 2 ·6H 2 O. Prepare the expanded graphite / polyaniline / cobalt ferrite ternary composite with a cobalt ferrite mass fraction of 0.4 according to the method of Example 1;

[0059] (4) Same as step (4) of Example 1.

[0060] B. Absorption performance test

[0061] The steps are the same as in Example 1.

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Abstract

The invention discloses an expandable graphite / polyaniline / cobalt ferrite wave-absorbing material with an anti-electromagnetic interference function and a preparation technology thereof. The invention aims to provide an expandable graphite / polyaniline / cobalt ferrite wave-absorbing material which has strong electromagnetic wave absorbing capability and wide absorption frequency bandwidth and is convenient to use without causing environmental pollution and a preparation technology thereof. According to the invention, the wave-absorbing material consists of paraffin serving as a film forming material and an expandable graphite / polyaniline / cobalt ferrite ternary complex serving as an electromagnetic wave absorbent. The preparation technology of the expandable graphite / polyaniline / cobalt ferrite wave-absorbing material comprises the following steps of: (1) preparing expandable graphite; (2) preparing absolute ethyl alcohol containing expandable graphite; (3) preparing an expandable graphite / polyaniline binary complex; (4) preparing the expandable graphite / polyaniline / cobalt ferrite ternary complex; and (5) weighing the expandable graphite / polyaniline / cobalt ferrite ternary complex and the paraffin, uniformly mixing the expandable graphite / polyaniline / cobalt ferrite ternary complex and the paraffin and performing ball milling to obtain the expandable graphite / polyaniline / cobalt ferrite wave-absorbing material.

Description

Technical field [0001] The invention belongs to the technical field of magnetic materials, in particular to an expanded graphite / polyaniline / cobalt ferrite wave absorbing material with anti-electromagnetic interference effect and a preparation process. Background technique [0002] With the development of modern science and technology and the continuous progress of industrial civilization, more and more electromagnetic wave pollution produced by electronic and electrical equipment and communication systems has penetrated into every corner of production and life, seriously affecting people's physical and mental health. Studies have shown that microwave electromagnetic radiation can cause diseases of the biological matrix, central nervous system, cardiovascular system, eye lens, and blood system; at the same time, the damage caused by the interference of this electromagnetic radiation (pollution) on various electronic devices cannot be underestimated. . Therefore, how to effective...

Claims

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Application Information

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IPC IPC(8): C08L91/06C08L79/02C08K7/24C08K3/04C08K3/22C08G73/02H01F1/12
Inventor 李良超陈柯宇向晨郝斌肖秋实许峰
Owner ZHEJIANG NORMAL UNIVERSITY
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