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Electromagnetic shielding material and preparation method and application thereof

An electromagnetic shielding material and electromagnetic shielding technology, applied in the fields of magnetic/electric field shielding, electrical components, etc., can solve the problems of high production cost and complicated preparation process, and achieve the goal of improving utilization rate, excellent electromagnetic shielding efficiency, and excellent electromagnetic shielding performance Effect

Active Publication Date: 2018-11-13
ZKCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the deficiencies in the prior art, the purpose of the present invention is to provide an electromagnetic shielding material with excellent shielding performance and its preparation method and use, while reducing the content of graphene components in traditional electromagnetic shielding materials and solving the problem of traditional electromagnetic shielding materials. Problems such as high production cost and complex preparation process

Method used

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  • Electromagnetic shielding material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] The electromagnetic shielding material 1 is prepared by the following steps:

[0052] Step (1), disperse 1g of graphene oxide in water, prepare a dispersion with a concentration of 2mg / mL, add 9g of activated carbon powder obtained by pyrolytic carbonization and activation of wood chips with a particle size of 500 mesh, and stir and mix for 2h The graphene oxide is evenly adsorbed on the surface of the activated carbon, and then, 4g of ascorbic acid is added to the mixed solution and the temperature of the mixed solution is raised to 80-98°C, and the temperature is kept constant for 2-4 hours to reduce the graphene oxide, and the reduced product is filtered. Washing to obtain graphene-biochar composite filler;

[0053] In step (2), the graphene-biochar composite filler obtained in step (1) is placed in a high-temperature oxygen-free environment at 1100° C. for thermal reduction for 20 minutes to obtain a thermally reduced filler;

[0054] Step (3): Dissolve 90g of poly...

Embodiment 2

[0056] The only difference with Example 1 is that the add-on of graphene oxide in step (1) is 0.06g, the add-on of activated carbon is 1.2g, and the add-on of polyvinyl alcohol 1799 in step (3) is 98.74g.

[0057] Example 2 An electromagnetic shielding material 2 was obtained.

Embodiment 3

[0059] The difference with Example 1 is only that the add-on of graphene oxide is 10g in the step (1), the add-on of gac is 20g, and the add-on of polyvinyl alcohol 1799 is 70g in the step (3).

[0060] Example 3 An electromagnetic shielding material 3 was obtained.

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Abstract

The invention provides an electromagnetic shielding material and a preparation method and application thereof. The electromagnetic shielding material comprises a polymer matrix and graphene-charcoal composite filler dispersed in the polymer matrix, wherein the graphene-charcoal composite filler is composed of charcoal and graphene applied to the surface of the charcoal. The layer number of the graphene in the electromagnetic shielding material is single, the conductivity can as high as 50 S / m, and the effectiveness of shielding electromagnetic waves of 8-12 GHz can be as high as about 50 dB. The graphene content in the obtained electromagnetic shielding material is lower and is one or more magnitude order lower than that of an electromagnetic shielding material using pure graphene as filler, the production cost is greatly reduced, and the graphene-charcoal composite filler preparation method is simple, high in universality and suitable for large-scale popularization and use.

Description

technical field [0001] The invention belongs to the field of composite materials, and in particular relates to an electromagnetic shielding material and its preparation method and application. Background technique [0002] With the rapid development of science and technology, electronic communication equipment and portable electronic products have brought great convenience to people's lives. At the same time, problems such as electromagnetic pollution, electromagnetic interference, and electromagnetic leaks have also occurred, especially for some high-precision electronic devices. The normal operation of the equipment will have a greater impact. In order to shield the influence of electromagnetic radiation, the most effective means is to develop high-performance electromagnetic shielding materials to alleviate and eliminate electromagnetic waves. At present, in addition to using heavy metal materials as electromagnetic shielding materials, polymer composites prepared by ble...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K9/10C08K3/04C08K7/00C08L29/04C08L63/00C08L23/06H05K9/00
CPCC08K3/04C08K3/042C08K7/00C08K9/10C08K2201/001H05K9/0081C08L29/04C08L63/00C08L23/06
Inventor 汪印赖登国
Owner ZKCH
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