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Method for preparing graphene electromagnetic shielding material

An electromagnetic shielding material, graphene technology, applied in the direction of graphene, magnetic/electric field shielding, chemical instruments and methods, etc., can solve the problems of limited electromagnetic shielding performance, high density of membrane airgel, and limited release of gas, etc., to achieve Excellent shielding effect, low density, easy processing effect

Active Publication Date: 2020-07-03
HANGZHOU GAOXI TECH CO LTD
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

At present, the preparation of highly oriented porous graphene airgel materials mainly adopts the method of high temperature treatment film, and utilizes the method of graphene oxide film to release gas at high temperature to prepare porous graphene film airgel (for example, the patent publication number is CN105731434B ), but due to the extremely limited gas released by the graphene oxide film under high temperature treatment, the expansion effect on the film is limited, and the resulting film airgel has a high density (20mg / cm3), so its electromagnetic shielding performance is limited

Method used

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  • Method for preparing graphene electromagnetic shielding material
  • Method for preparing graphene electromagnetic shielding material
  • Method for preparing graphene electromagnetic shielding material

Examples

Experimental program
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Effect test

Embodiment 1

[0024] A suspension of graphene oxide with a size distribution between 20-30um, a carbon-to-oxygen ratio of 2.5, and a concentration of 5mg / ml (purchased from Hangzhou Gaoxi Technology Co., Ltd.) was prepared by scraping to form a film with a thickness of about 20um. The graphene oxide membrane material was cut into a disc, and then placed in 85% hydrazine hydrate solution. After one hour, a graphene airgel with a height of about 8.1mm was obtained, and the hair was replaced with ethanol. Foam solution, and then dried at 60°C to remove ethanol, after 1 hour of high temperature treatment at 1600°C, a density of 3 mg / cm 3 The graphene-based airgel, I D / I G It is 0.2, and its electromagnetic shielding effectiveness is 110dB at 5mm.

Embodiment 2

[0026] A suspension of graphene oxide with a size distribution between 80-100um, a carbon-to-oxygen ratio of 2.35, and a concentration of 10mg / ml (purchased from Hangzhou Gaoxi Technology Co., Ltd.) was prepared by scraping to form a film with a thickness of about 50um. The graphene oxide membrane material is cut into a disc, and the graphene oxide membrane material is placed in 100mg / ml ammonium bicarbonate aqueous solution. After a period of time, a graphene airgel with a height of about 12.6mm is obtained. Materials, replace the blowing agent solution with isopropanol, and then dry at 60°C to remove isopropanol. After 1 hour of high temperature treatment at 1600°C, a density of 5 mg / cm is obtained. 3 Graphene-based aerogels, I D / I G It is 0.15, and its electromagnetic shielding effectiveness is 70dB at 5mm.

Embodiment 3

[0028] A suspension of graphene oxide with a size distribution between 100-200um, a carbon-to-oxygen ratio of 2.14, and a concentration of 10mg / ml (purchased from Hangzhou Gaoxi Technology Co., Ltd.) was prepared by suction filtration to obtain a 30um thick graphene oxide suspension. Graphene membrane material, cut it into a disc, place the graphene oxide membrane material in 100mg / ml ammonium bicarbonate aqueous solution, and after a period of time, a graphene airgel material with a height of about 8.5mm is obtained. Replace the blowing agent solution with isopropanol, and then dry at 60°C to remove isopropanol. After 1 hour of high-temperature treatment at 1000°C, a density of 5.3 mg / cm was obtained. 3 Graphene-based aerogels, I D / I G It is 0.1, and its electromagnetic shielding effectiveness is 102dB at 5mm.

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Abstract

The invention provides a method for preparing an electromagnetic shielding aerogel material through a liquid foaming process for the first time. Prepared graphene aerogel has a layer-by-layer highly-oriented porous structure, layer-by-layer highly-oriented low-defect graphene sheets are beneficial to enhancing the reflection of the graphene sheets to electromagnetic waves, and in addition, the existing pores are beneficial to enhancing the multi-reflection loss of the electromagnetic waves in the material, so that the graphene material disclosed by the invention has extremely strong electromagnetic shielding performance.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and in particular relates to a preparation method of a graphene electromagnetic shielding material. Background technique [0002] With the continuous development of the information age, people's demand for intelligent and integrated electronic equipment continues to grow. Problems such as electromagnetic interference, electromagnetic leakage, and electromagnetic pollution can not be ignored for damage to equipment and the environment. The service life is reduced, and there is also a certain impact on human health. Traditional electromagnetic shielding materials are mainly metal materials, such as copper, aluminum, nickel, etc., which have high electromagnetic shielding efficiency and good mechanical properties, but have disadvantages such as high density and easy corrosion; in contrast, carbon materials, such as carbon black , carbon fiber, carbon nanotubes, graphene, etc., have the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/184C01B32/194H05K9/00
CPCC01B2204/20C01B32/184C01B32/194H05K9/0081
Inventor 高超许震庞凯
Owner HANGZHOU GAOXI TECH CO LTD
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