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A kind of preparation method of wrinkled graphene and its electromagnetic shielding material

An electromagnetic shielding material, graphene technology, applied in graphene, chemical instruments and methods, inorganic chemistry and other directions, can solve the problems of complex preparation process, poor electromagnetic shielding performance, etc., achieve simple and efficient methods, improve production efficiency, excellent electromagnetic The effect of shielding performance

Active Publication Date: 2021-08-24
KETAN XIAMEN NEW CARBON MATERIAL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation process of the method is complicated, and the electromagnetic shielding performance is relatively poor

Method used

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  • A kind of preparation method of wrinkled graphene and its electromagnetic shielding material
  • A kind of preparation method of wrinkled graphene and its electromagnetic shielding material
  • A kind of preparation method of wrinkled graphene and its electromagnetic shielding material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] A preparation method of an electromagnetic shielding material comprises the steps of:

[0059] (1) 325 purpose natural flake graphite is adopted the improved Hummers method to prepare graphene oxide, obtains graphene oxide dispersion liquid, and in described graphene dispersion liquid, graphene oxide lamellar average lateral size is 15 μ m;

[0060] (2) The graphene oxide dispersion of 2.5mg / mL was mixed with ascorbic acid and hydroiodic acid for 0.5h, and the mass ratio of the graphene oxide, ascorbic acid and hydroiodic acid was 1:10:8 to obtain a mixed solution ;

[0061] (3) The mixed solution described in step (2) was heated at 90° C. for 2.5 h under agitation, filtered, washed, and freeze-dried to obtain graphene, and the obtained graphene was observed with a scanning electron microscope, and its surface morphology was as follows: figure 1 As shown, it can be seen from the figure that the surface of the graphene powder presents a highly wrinkled form; Figure 4 ...

Embodiment 2

[0064] The difference from Example 1 is that the natural flake graphite in step (1) is 400 mesh, and the average lateral size of the graphene oxide sheets in the graphene dispersion is 10 μm.

Embodiment 3

[0066] The difference from Example 1 is that the concentration of the graphene oxide dispersion in step (2) is 1.5 mg / mL.

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Abstract

The invention relates to a preparation method of wrinkled graphene, the preparation method comprising the following steps: (1) mixing the graphene oxide dispersion with ascorbic acid and hydroiodic acid to obtain a mixed solution; (2) mixing the The mixed solution is heated to obtain the wrinkled graphene. In the present invention, ascorbic acid and hydroiodic acid act synergistically, while graphene oxide is efficiently reduced, the obtained graphene has a good wrinkled structure, and the wrinkled structure can effectively inhibit the stacking of graphene nanosheets, thereby Obtain more fluffy graphene powder with low density; wrinkled graphene powder is easier to filter out from the reduced dispersion liquid, which solves the problem that graphene powder is difficult to separate in practical applications and greatly improves production efficiency; at the same time, graphite The wrinkled surface of the olefin sheet is conducive to enhancing the shielding effect of electromagnetic waves.

Description

technical field [0001] The invention belongs to the field of electromagnetic shielding materials, and in particular relates to a preparation method of wrinkled graphene and an electromagnetic shielding material thereof. Background technique [0002] With the rapid development and precision improvement of modern electronic products, electromagnetic radiation pollution is becoming more and more serious. The development of high-performance electromagnetic shielding materials is an effective means to alleviate electromagnetic interference, leakage and human health hazards caused by electromagnetic wave pollution. Two-dimensional planar graphene has incomparable properties such as ultra-high electrical conductivity, excellent thermal conductivity and mechanical properties, and ultra-large theoretical specific surface area. It is an ideal material for preparing electromagnetic shielding materials. Graphene / polymer electromagnetic shielding composites prepared by filling graphene ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/184C08K3/04C08L29/04C08L21/00
CPCC01B2204/32C08K3/042C01B32/184C08L29/04C08L21/00
Inventor 汪印赖登国
Owner KETAN XIAMEN NEW CARBON MATERIAL CO LTD
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