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Graphene-based electromagnetic shielding composite material

An electromagnetic shielding and composite material technology, applied in the fields of magnetic/electric field shielding, electrical components, etc., can solve the problems of complicated preparation process, uneven dispersion, high manufacturing cost, and achieve the effect of simple process, easy preparation and shortening of molding cycle.

Inactive Publication Date: 2019-03-26
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The graphene-based electromagnetic shielding composite material can solve the problems of traditional metal-based electromagnetic shielding materials such as easy corrosion, instability, and high manufacturing cost, and the uneven dispersion in the graphene composite electromagnetic shielding material requires the introduction of additional additives and fillers to affect its mechanical properties. , electromagnetic shielding effectiveness and other shortcomings and complicated technical problems in the preparation process

Method used

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  • Graphene-based electromagnetic shielding composite material
  • Graphene-based electromagnetic shielding composite material
  • Graphene-based electromagnetic shielding composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Preparation of graphene slurry: disperse 500 mg of graphene in 100 ml of ethanol solution, sonicate to form a slurry with a uniform dispersion concentration of 5 mg / ml, and add 5 ml of binder naphthol. Prepare the sandwich three-layer structure graphene-based electromagnetic shielding composite material, the specific process is as follows: take 50 ml of the graphene slurry and apply it on the surface of a PVC foam board with a size of 10*20*0.2cm, and wait for the solvent to evaporate and dry completely , and evenly coated 50 ml of graphene slurry on the other side to obtain a graphene-based electromagnetic shielding composite material with a three-layer sandwich structure. The schematic diagram of the structure is as follows figure 2 As shown in ②, the thickness of the graphene film on each side is 25 microns, such as Figure 5 c and Figure 5 shown in d. The measured electromagnetic shielding effectiveness is 27dB.

Embodiment 2

[0052] Cut the graphene membrane material with a thickness of 25 microns to the same size as the PVC foam board. After cleaning the surface of the PVC foam board, apply a layer of adhesive, and then attach the graphene film evenly and flatly to its surface, and then apply adhesive on the other side, and attach a graphene film of the same size. The membrane obtains a graphene membrane / PVC foam board electromagnetic shielding composite material with a three-layer sandwich structure, such as image 3 e and image 3 shown in f. The measured electromagnetic shielding effectiveness is 21dB.

Embodiment 3

[0054] Preparation of graphene slurry: disperse 500 mg of graphene in 100 ml of ethanol solution, and ultrasonically make it form a slurry with a uniform dispersion concentration of 5 mg / ml. The sandwich three-layer structure graphene-based electromagnetic shielding composite material was prepared. The specific process was as follows: 50 ml of the graphene slurry was evenly coated on the surface of a fir board with a size of 10*20*2cm. After the solvent was completely evaporated and dried, the The other side is evenly coated with the same volume of graphene slurry to obtain a graphene-based electromagnetic shielding composite material with a three-layer sandwich structure, and its structure is as follows: Figure 5 a and Figure 5 as shown in b. The measured electromagnetic shielding effectiveness is 26dB.

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Abstract

The invention belongs to the field of electromagnetic shielding functional materials and more particularly to a graphene-based electromagnetic shielding composite material which comprises at least twolayers of graphene films, and a non-graphene spacer layer is arranged between the two layers of graphene films and is used for separating the two layers of graphene films with a certain distance. Themain component of the graphene film layers is graphene with the content of high than 50%, and the graphene film layers adhere to the upper surface and the lower surface of the non-graphene spacer layer. By adhering the graphene film layers of certain thickness on two sides of a substrate material of a sheet material, by setting a certain distance between the two graphene film layers, the electromagnetic shielding effect of the material is improved by using the principle that an electromagnetic wave is repeatedly reflected, absorbed, and attenuated at two interfaces.

Description

technical field [0001] The invention belongs to the field of electromagnetic shielding functional materials, and more specifically relates to a graphene-based electromagnetic shielding composite material. Background technique [0002] With the discovery of science and technology and the wide application of electronic equipment, many electronic equipment today will generate harmful electromagnetic waves during operation. Electromagnetic waves will not only endanger human health, but also cause malfunction of electronic equipment and interfere with communication. In addition, electromagnetic waves can also be used to steal classified information and damage military equipment. Developing high-performance electromagnetic shielding materials to eliminate the interference of electromagnetic waves has become a major topic in the fields of materials, electronics, and chemistry. [0003] Metal is the most traditional and most commonly used electromagnetic shielding material, but it...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05K9/00
CPCH05K9/0088
Inventor 王帅池凯
Owner HUAZHONG UNIV OF SCI & TECH
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