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Electromagnetic shielding composite material and preparation method thereof

A composite material, electromagnetic shielding technology, applied in the fields of magnetic/electric field shielding, chemical instruments and methods, electrical components, etc., can solve the difficult to solve the problem of the anti-oxidative sedimentation of metal fillers, the electrical conductivity and the electromagnetic shielding ability cannot be on a par, etc.

Active Publication Date: 2021-05-14
CHINA BUILDING MATERIALS ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, metal-based composite conductive materials also have obvious shortcomings, mainly because it is difficult to solve the oxidation resistance of metal fillers and the settlement of fillers during storage of coatings.
[0006] Carbon-based conductive composite materials mainly use graphite, carbon black, carbon fiber, etc. as conductive fillers, which have excellent corrosion resistance and are relatively light in weight; however, their electrical conductivity and electromagnetic shielding capabilities cannot be compared with metal-based conductive composite materials.

Method used

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  • Electromagnetic shielding composite material and preparation method thereof

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preparation example Construction

[0053] The present invention also proposes a preparation method of an electromagnetic shielding composite material, which includes the following steps:

[0054] 1) Prepare absorbing paper and metallized glass fiber cloth;

[0055] 2) The absorbing paper and the metallized glass fiber cloth are coated with adhesive on both sides to obtain the absorbing paper prepreg and the metallized glass fiber cloth prepreg;

[0056] 3) In the hot-pressing mold coated with a release agent, lay resin, metal-plated glass fiber cloth prepreg, several layers of wave-absorbing paper prepreg with different absorbing agent contents, and metal-plated glass fiber cloth prepreg. Impregnated body and resin; wherein, the content of the absorbing agent in the absorbing paper is arranged from low to high or from high to low;

[0057] 4) Hot pressing forming: heat preservation and pressure holding, the reaction time is 2-3min / mm, determined according to the thickness of the electromagnetic shielding compo...

Embodiment 1-5

[0068] Mix silicon carbide fiber, carbon black, graphite and ultrafine nickel powder in a mass ratio of 3:1:1:1 to obtain a composite wave absorbing agent; mix it with aramid fiber and polyvinyl alcohol in a mass ratio of 70:25 :5 mixed to make absorbent paper. Prepare metal-plated fiber cloth according to the material type and requirements shown in table 1; the adhesive agent shown in table 1 is coated on both sides of described wave-absorbing paper and metal-plated glass fiber cloth, obtain wave-absorbing paper prepreg and Metallized glass fiber cloth prepreg; In a hot press mold coated with a release agent, resin, metallized glass fiber cloth prepreg, and absorbing paper with the content of absorber shown in Table 1 are laid in sequence And the number of layers, metal-coated glass fiber cloth prepreg and resin; keep the temperature at 160°C, and the pressure at 20MPa. The reaction time is determined according to the thickness of the pressed material, generally 2.5min / mm; ke...

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Abstract

The present invention relates to an electromagnetic shielding composite material and a preparation method thereof. The electromagnetic shielding composite material includes a wave absorbing paper layer, which is the core layer of the electromagnetic shielding composite material; a conductive layer, which is connected to the surface of the wave absorbing paper layer; and a resin layer, which is the core layer of the electromagnetic shielding composite material. The surface layer is connected to the surface of the conductive layer; the absorbing paper layer and the conductive layer are connected through the adhesive layer to form a resin layer / conductive layer / adhesive layer / absorber layer / adhesive layer / conductive layer Layer / resin layer composite structure; the absorbing paper layer includes several layers of absorbing paper; when the number of layers of absorbing paper≧2, the absorbing papers are connected together by an adhesive layer. The electromagnetic shielding composite material adopts a multi-layer composite structure and introduces a double shielding mechanism of reflection and absorption. It can not only shield electromagnetically, but also has a certain bearing function. It can be used for high electromagnetic radiation intensity, wide radiation frequency band, and strict requirements for secondary interference. field, and thus more practical.

Description

technical field [0001] The invention belongs to the field of shielding materials, and in particular relates to an electromagnetic shielding composite material and a preparation method thereof. Background technique [0002] With the development of modern science and technology, the electromagnetic environment is becoming increasingly complex. After noise pollution, air pollution, and water pollution, electromagnetic pollution has become the fourth major public hazard that threatens human survival. Electromagnetic leakage not only endangers the physical and mental health of human beings, but also affects the normal work of precision instruments. Electromagnetic shielding materials can absorb, reflect and lose energy to external interference electromagnetic waves and internal electromagnetic waves, which is an important way to effectively realize electromagnetic shielding technology. [0003] Conductive polymer materials have excellent electromagnetic shielding performance, an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B17/02B32B7/12B32B15/02B32B17/06B32B27/12B32B27/30B32B27/38B32B27/42B32B29/00B32B29/02B32B33/00B32B37/02B32B37/10B32B37/12B32B38/18H05K9/00
CPCB32B5/02B32B7/12B32B15/02B32B17/065B32B27/12B32B27/308B32B27/38B32B27/42B32B29/002B32B29/02B32B33/00B32B37/02B32B37/10B32B37/1284B32B38/1808B32B2255/02B32B2255/205B32B2260/023B32B2262/101B32B2307/212H05K9/0088
Inventor 贾菲徐铭鲍红权张帆崔凯
Owner CHINA BUILDING MATERIALS ACAD
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