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Electromagnetic shielding composite material based on graphene honeycomb structure, and preparation method and application thereof

A technology of electromagnetic shielding and honeycomb structure, applied in the direction of magnetic/electric field shielding, electrical components, etc., can solve the problems affecting the conductivity and electromagnetic shielding performance, and achieve the effects of improving conductivity and electromagnetic shielding performance, reducing weight, and uniform structure arrangement

Active Publication Date: 2019-05-21
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the commonly used three-dimensional structure has many excellent properties, the graphene sheets will be partially oriented or arranged almost parallel to each other, forming an anisotropic layered structure, which affects the electrical conductivity and electromagnetic shielding properties

Method used

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  • Electromagnetic shielding composite material based on graphene honeycomb structure, and preparation method and application thereof
  • Electromagnetic shielding composite material based on graphene honeycomb structure, and preparation method and application thereof
  • Electromagnetic shielding composite material based on graphene honeycomb structure, and preparation method and application thereof

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preparation example Construction

[0032] The present invention also provides a preparation method of the electromagnetic shielding composite material described in the above technical solution, comprising the following steps:

[0033] The aluminum oxide honeycomb board is immersed in the graphene oxide solution, and then freeze-dried to obtain a graphene oxide-aluminum honeycomb board composite structure;

[0034] Etching the aluminum oxide honeycomb plate in the graphene oxide-aluminum honeycomb plate composite structure with dilute hydrochloric acid, then drying to obtain the honeycomb structure graphene oxide;

[0035] Annealing the honeycomb structure graphene oxide in a hydrogen / argon mixed atmosphere to obtain honeycomb structure graphene;

[0036] Mix epoxy resin and curing agent in a water bath, pour the resulting mixture into the honeycomb structure graphene, and then sequentially pump air and solidify to obtain the electromagnetic shielding composite material.

[0037] In the invention, the aluminum ...

Embodiment 1

[0060] Add 0.5 parts by weight of natural graphite flakes to 2 parts by weight of 98% concentrated sulfuric acid, stir at 80°C for 4 hours; add the product to 20 parts by weight of 98% concentrated sulfuric acid after dilution and suction filtration, and add 1.5 parts by weight KMnO 4 , stirred for 20min, heated to 35°C and stirred for 2h; added 30 parts by weight of deionized water and stirred for 15 minutes, then added 5 parts by weight of H 2 o 2 ; Then add 100 parts by weight of deionized water and 10 parts by weight of 12mol / L concentrated hydrochloric acid to leave standstill and centrifuge to obtain GO;

[0061] The aluminum oxide honeycomb board was immersed in the GO solution, and after ultrasonic treatment for 30 min, it was left to stand for 48 h to obtain the graphene oxide-aluminum honeycomb board composite structure. After it was placed in a freeze dryer for 48hrs, the aluminum oxide honeycomb board was etched with 10 parts by weight of 1.5mol / L dilute hydrochl...

Embodiment 2

[0066] Add 1 part by weight of natural graphite flakes to 4 parts by weight of 98% concentrated sulfuric acid, stir at 80°C for 6 hours; add the product to 40 parts by weight of 98% concentrated sulfuric acid after dilution and suction filtration, and add 3 parts by weight of KMnO 4 , stirred for 40min, heated to 35°C and stirred for 2h; added 60 parts by weight of deionized water and stirred for 15 minutes, then added 10 parts by weight of H 2 o 2 ; Then add 200 parts by weight of deionized water and 20 parts by weight of 12mol / L concentrated hydrochloric acid to leave standstill and centrifuge to obtain GO;

[0067] The aluminum oxide honeycomb board was immersed in the GO solution, and after ultrasonic treatment for 30 min, it was left to stand for 48 h to obtain the graphene oxide-aluminum honeycomb board composite structure. After it was placed in a freeze dryer for 72 hours, the aluminum oxide honeycomb board was etched with 10 parts by weight of 1.5 mol / L dilute hydro...

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Abstract

The invention provides an electromagnetic shielding composite material based on a graphene honeycomb structure, and belongs to the field of electromagnetic shielding. The electromagnetic shielding composite material includes 1.1-2.6 parts by weight of honeycomb structure graphene, 100 parts by weight of epoxy resin and 26.5 parts by weight of a curing agent. The honeycomb wall of the electromagnetic shielding composite material is formed by graphene penetration, has a uniformly arranged structure and forms a complete conductive path, and electromagnetic waves undergo multiple reflection, scattering and absorption processes in the honeycomb structure after entering the honeycomb structure, so the structure can greatly improve the multiple adsorption, reflection and scattering of the electromagnetic waves inside the material, prolong the path of the electromagnetic waves in the material, easily realizes the transmittance, absorption and scattering of the electromagnetic waves in the structure, and improves the electrical conducting and electromagnetic shielding performances of the composite material. The honeycomb structure graphene is in a state close to a hollow state, and can remarkably reduce the weight of the material.

Description

technical field [0001] The invention relates to the technical field of electromagnetic shielding, in particular to an electromagnetic shielding composite material based on a graphene honeycomb structure and its preparation method and application. Background technique [0002] Epoxy resin has the advantages of high tensile strength and Young's modulus, good solvent resistance and low cost, and is one of the main matrix materials used to manufacture polymer-based electromagnetic shielding composites. Compared with traditional metal-based electromagnetic shielding materials, carbon filler / polymer-based composites have the advantages of low density, high electrical conductivity, corrosion resistance and easy processing, and are currently one of the most ideal electromagnetic shielding materials. Compared with other carbon materials, graphene has characteristics such as large specific surface area and excellent electron transport performance, and has broad application prospects i...

Claims

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Application Information

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IPC IPC(8): C08L63/00C08K7/24C08K7/00C08K9/00H05K9/00
Inventor 顾军渭宋萍邱华梁超博王雷孔杰
Owner NORTHWESTERN POLYTECHNICAL UNIV
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