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Preparation method of wrinkled graphene and electromagnetic shielding material

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

Active Publication Date: 2019-07-23
KETAN XIAMEN NEW CARBON MATERIAL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Preparation method of wrinkled graphene and electromagnetic shielding material
  • Preparation method of wrinkled graphene and electromagnetic shielding material
  • Preparation method of wrinkled graphene and 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 includes the following steps: (1) mixing a graphene oxide dispersion with ascorbic acid and hydroiodic acid to obtain a mixed solution; and (2) heating the mixed solution of the step (1) to obtain the wrinkled graphene. In the preparation method, the ascorbic acid and the hydroiodic acid act synergisticallyso as to efficiently reduce graphene oxide and enable the obtained graphene has a good wrinkled structure. The wrinkled structure can effectively inhibit the stacking of graphene nanosheet layers so as to obtain more fluffy graphene powder with low density. The wrinkled graphene powder can be more easily filtered out from a reduced dispersion, which solves the problem of difficult separation of graphene powder in practical application and greatly improves the production efficiency. Meanwhile, wrinkled surfaces of the graphene sheet layers are beneficial to the reinforcement of 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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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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