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Graphene electromagnetic shielding composite material and preparation method thereof

A composite material and electromagnetic shielding technology, applied in the direction of magnetic/electric field shielding, electrical components, etc., can solve the problems of poor shielding performance of graphene electromagnetic shielding materials, achieve excellent intrinsic antimagnetic, reduce damage, and avoid pollution effects

Active Publication Date: 2022-05-03
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a graphene electromagnetic shielding composite material and a preparation method thereof, so as to solve the technical problem of poor shielding performance of the graphene electromagnetic shielding material

Method used

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  • Graphene electromagnetic shielding composite material and preparation method thereof
  • Graphene electromagnetic shielding composite material and preparation method thereof
  • Graphene electromagnetic shielding composite material and preparation method thereof

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preparation example Construction

[0031] Such as figure 1 Shown, a kind of graphene electromagnetic shielding composite material preparation method of the present invention comprises the following steps:

[0032] (1) Exfoliating highly oriented pyrolytic graphite by physical or chemical methods to prepare multilayer graphene nanosheet powder;

[0033] (2) Ultrasonic the multilayer graphene nanosheet powder to obtain dispersed graphene nanosheets, heat and stir the dispersed graphene nanosheets and polymer matrix materials in a polar organic dispersant, and proceed after each is uniformly dispersed Stir and blend evenly to form a graphene-polymer mixture;

[0034](3) Inject the graphene-polymer mixture into the mold groove and use a constant temperature heating plate to heat it at a constant temperature, and at the same time apply a magnetic field outside it to make the graphene nanosheets achieve orientation in the solution, and wait until the organic dispersant volatilizes completely Finally, the highly ori...

Embodiment 1

[0045] Highly oriented pyrolytic graphite is prepared by intercalation exfoliation and freeze-drying techniques to prepare multilayer graphene nanosheet powder. Take a certain mass of multi-layer graphene nanosheet powder and epoxy resin (EP) respectively ultrasonically, heat and stir for 1 hour to disperse them in N-methylpyrrolidone, and blend them after they are uniformly dispersed to form graphene- Epoxy resin uniform mixture; inject the uniform mixture into a circular silicone mold with a diameter of 30mm, and use a ceramic heating plate to heat the bottom of the mold at a constant temperature of 45°C, and at the same time apply a horizontal rotating magnetic field with a magnetic field strength of 300mT to make the graphene nanometer The flakes are oriented in the dispersion, and after the solvent is completely volatilized, they are placed in a constant temperature blast drying oven at 120°C for 12 hours to dry and solidify, and finally a highly oriented graphene / ring wit...

Embodiment 2

[0049] Highly oriented pyrolytic graphite is prepared by intercalation exfoliation and freeze-drying techniques to prepare multilayer graphene nanosheet powder. Take a certain mass of multilayer graphene nanosheet powder and ultrasonically disperse it in N-methylpyrrolidone for 1 hour to obtain a dispersion, then add a certain mass of polyvinylidene fluoride and epoxy resin to the dispersion, and Blending is carried out by heating and stirring (60°C, 800rpm) and ultrasonication for 1 hour each, and finally a graphene-epoxy resin-polyvinylidene fluoride (PVDF) uniform mixture is formed; the uniform mixture is injected into a circle with a diameter of 30mm Shaped silica gel mold, and the bottom of the mold was heated at a constant temperature of 45°C with a ceramic heating plate, and a horizontal rotating magnetic field with a magnetic field strength of 300mT was applied at the same time to align the graphene nanosheets in the mixed solution. After the solvent was completely evap...

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Abstract

The invention relates to a preparation method of a graphene electromagnetic shielding composite material. The preparation method comprises the following steps: stripping highly oriented pyrolytic graphite by adopting a physical or chemical method to prepare graphene nanosheets; the preparation method comprises the following steps: dispersing graphene nanosheets and a polymer matrix material in a polar organic dispersant to form a graphene-polymer mixed solution; and finally, realizing directional arrangement of the graphene nanosheets in the solution through an external magnetic field, and curing the graphene nanosheets to obtain the anisotropic graphene electromagnetic shielding composite material with high directional arrangement. The nanosheets in the graphene electromagnetic shielding composite material can be directionally arranged, and the graphene nanosheets without functional groups are adopted, so that the problem of poor performance of the graphene electromagnetic shielding material is solved.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic material shielding, and in particular relates to a graphene electromagnetic shielding composite material and a preparation method thereof. Background technique [0002] The rapid development of wireless communication technology has brought many conveniences to human society, such as Bluetooth, home WIFI and 5G communication. These technologies not only make everything in the world interconnected, but also make the world smarter and more efficient. However, with the wide application of wireless communication technology, the radiation interference generated by electromagnetic waves has gradually attracted the attention of the scientific community, because the increase of this electromagnetic pollution will not only lead to failure and performance degradation of electronic products, but also seriously affect the surrounding environment to a certain extent. and human health. In this case, in...

Claims

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Application Information

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IPC IPC(8): C08J3/28C08J3/215C08J3/205C08L63/00C08L27/16C08K3/04H05K9/00
CPCC08J3/28C08J3/215C08J3/2053H05K9/0081C08J2363/00C08J2427/16C08K3/042
Inventor 周朝福林峰王志明童鑫戚宇
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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