Composite shielding material and preparation method thereof

A composite shielding and electromagnetic shielding technology, applied in the field of composite shielding materials and its preparation, can solve the problems of hard texture, complex construction, high density, etc., and achieve the effects of smooth surface, high degree of automation, and simple preparation process

Inactive Publication Date: 2016-10-12
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Commonly used electromagnetic shielding materials are mainly metal, generally in the form of plates, strips or coatings. These materials are widely used in many fields, but there are also some shortcomings, such as high density, complicated construction, hard texture and difficult molding, etc.

Method used

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  • Composite shielding material and preparation method thereof
  • Composite shielding material and preparation method thereof
  • Composite shielding material and preparation method thereof

Examples

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Embodiment 1

[0032] A composite shielding material, comprising by weight:

[0033]

[0034] The thickness of the expanded graphite is 0.5 μm, and the length is 50 μm.

[0035] The flake magnetic powder is Fe-Si-Al, the content of Fe in the magnetic powder is 78%, the content of Si is 12%, the content of Al is 10%, the thickness of the flake magnetic powder is 0.3 μm, and the length is 10 μm.

[0036] The dispersant in this embodiment is glyceryl trioleate; the rubber is nitrile rubber; the vulcanizing agent is dicumyl peroxide.

[0037] The mixture of expanded graphite and flake magnetic powder in this embodiment is a binary mixture, the mass ratio of binary mixture to rubber is 2:1; the mass ratio of flake magnetic powder to expanded graphite is 1:1.

[0038] The preparation method of above-mentioned composite shielding material, comprises the following steps:

[0039] 1) Preparation of expanded graphite: take 100 parts by weight of expandable graphite, place it in a muffle furnace a...

Embodiment 2

[0046] A composite shielding material, comprising by weight:

[0047]

[0048]The thickness of the expanded graphite in the present embodiment is 15 μm, and the length is 200 μm; The flaky magnetic powder is Fe-Si-Al, and the Fe content is 90% in the magnetic powder, and the Si content is 5%, and the Al content is 5%, and the flaky magnetic powder The thickness is 5 μm and the length is 100 μm.

[0049] The dispersant in this embodiment is benzenesulfonic acid; the rubber is ethylene-propylene rubber; and the vulcanizing agent is dibenzoyl peroxide.

[0050] The mixture of expanded graphite and flake magnetic powder in this embodiment is a binary mixture, the mass ratio of binary mixture to rubber is 10:1; the mass ratio of flake magnetic powder to expanded graphite is 9:1.

[0051] The preparation method of above-mentioned composite shielding material, comprises the following steps:

[0052] 1) Preparation of expanded graphite: Take 100 parts by weight of expandable grap...

Embodiment 3

[0059] Take 3000 parts of expandable graphite (referred to as Kp) and place it in a muffle furnace at 700°C, take it out after 1 minute to obtain expanded graphite, and record it as EG. Add flaky FeSiAl magnetic powder (900 parts) and expanded graphite (100 parts) (mass ratio: 9:1) into a homogeneous mixer, and add an appropriate amount of ethanol and 2 parts of triolein as a dispersant, and stir for 2 hours. Mix the mixture well, then dry the mixture. Fluorine rubber, flaky FeSiAl magnetic powder and dicumyl peroxide (DCP) were selected as the matrix, absorbent and vulcanizing agent respectively.

[0060] Put 100 parts of fluororubber, 1000 parts of flaky FeSiAl magnetic powder and expanded graphite mixture into a banbury mixer, the banburying temperature is 90°C, after 30 minutes of banburying, add 4 parts of vulcanizing agent dicumyl peroxide (DCP ), then banburying for 30 minutes. After taking out the mixture, put it into an open mill for kneading. After kneading for 5 t...

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Abstract

The invention discloses a composite shielding material. The composite shielding material is prepared from the following components in parts by weight: 100 parts of expanded graphite, 100-900 parts of sheet magnetic powder, 0.6-2 parts of a dispersing agent, 100 parts of rubber, and 0.3-2 parts of a vulcanizing agent. The invention further discloses a preparation method of the composite shielding material. The prepared composite shielding material has the characteristics of high electromagnetic property, high shielding property and the like, and can have good wave absorbing property in a GHz frequency band.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic compatibility, and in particular relates to a composite shielding material and a preparation method thereof. Background technique [0002] With the rapid development of science and technology, various electronic appliances are widely used, and electromagnetic interference and electromagnetic radiation pollution have become an environmental hazard. These hazards can be reduced by using electromagnetic shielding materials to reflect or absorb electromagnetic waves. Commonly used electromagnetic shielding materials are mainly metal, generally in the form of plates, strips or coatings. These materials are widely used in many fields, but there are also some shortcomings, such as high density, complicated construction, hard texture and difficult molding. Therefore, research on composite materials with light weight, softness and high shielding efficiency has strong application value. Expanded g...

Claims

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Application Information

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IPC IPC(8): C08L9/02C08L23/16C08L27/12C08K13/04C08K7/24C08K7/00C08K3/08C08K3/02B29C69/00B29C43/24B29C35/02B29B9/00B29B7/74
CPCC08K13/04B29B7/7461B29B9/00B29C35/02B29C43/24B29C69/001C08K3/02C08K3/08C08K7/00C08K7/24C08K2003/023C08K2003/0812C08K2003/0856C08K2201/004C08K2201/01C08L9/02C08L23/16C08L27/12
Inventor 郝斌刘立东叶怡婷
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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