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Preparation of graphene/superpolymer multilayer material with high electromagnetic shielding performance

A technology of electromagnetic shielding and high polymer, which is applied in the field of preparation of graphene/polymer composite multilayer structure materials, can solve the problems of reducing the strength of composite materials, conduction and electromagnetic shielding, poor dispersion of graphene, and agglomeration, etc., to achieve Low cost, easy process control, and high yield

Inactive Publication Date: 2017-10-24
PEKING UNIV +1
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Problems solved by technology

However, in the composite materials obtained by this method, the dispersion of graphene is usually relatively poor, and it is prone to agglomeration, which greatly reduces the strength, conductivity and electromagnetic shielding properties of the composite material.

Method used

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  • Preparation of graphene/superpolymer multilayer material with high electromagnetic shielding performance
  • Preparation of graphene/superpolymer multilayer material with high electromagnetic shielding performance

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Embodiment Construction

[0020] The present invention will be further described below in conjunction with an implementation example, but the application of the present invention is not limited to the following specific implementation example.

[0021] refer to figure 1 , the preparation process of the present invention is as follows:

[0022] 1. Preparation of graphene oxide solution:

[0023] Select natural flake graphite as the basic raw material, and adopt the improved Hummers method to prepare graphene oxide solution. The specific preparation steps are as follows:

[0024] (1) Place 200 mL of concentrated sulfuric acid and 4 g of sodium nitrate in a conical flask, cool in an ice bath and fully stir until the sodium nitrate is completely dissolved;

[0025] (2) During the stirring process, slowly add 4 g of graphite until the mixture is uniform, and keep the temperature of the reaction system not exceeding 8 °C during this process;

[0026] (3) Slowly add 18 g of potassium permanganate until mix...

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Abstract

The invention provides a preparation method of a graphene / superpolymer multilayer material with high electromagnetic shielding performance, and belongs to the field of electromagnetic shielding material preparation. The method comprises the following steps: firstly preparing an oxidized graphene solution by adopting a liquid-phase stripping method; then carrying out freeze drying on a graphene thin film reduced by metallic foil under a vacuum condition so as to obtain a graphene aerogel thin film; and finally infiltrating a thin superpolymer layer on the surface of the thin film, laminating thin film layers together to prepare the graphene / superpolymer multilayer material. The method is simple in technological conditions, the flow is easy to control, the source of the raw materials is wide, the cost is low, and the method is convenient for industrial production. Due to the fact that graphene sheets are assembled to form a certain structure before the graphene is mixed with the superpolymer, and agglomeration in the mixing process of the graphene sheets and the superpolymer is avoided, the composite material has the characteristics of high strength, high conductivity, corrosion resistance, high electromagnetic shielding performance and the like, and can be widely applied to civil and military fields such as consumer electronics, communication equipment, information transfer and security.

Description

technical field [0001] The invention belongs to the field of preparation of electromagnetic shielding materials, in particular to a preparation method of a graphene / high polymer composite multilayer structure material. Background technique [0002] With the advent of the digital industrial age, the continuous development of electronic communication equipment and intelligent terminals has brought great convenience to people's lives and accelerated people's life rhythm and work efficiency. However, during the working process of electronic equipment, a certain amount of electromagnetic waves will be generated. The radiation brought by these electromagnetic waves will not only threaten human health, but also interfere with the normal operation of electronic components with high sensitivity. In order to prevent the increasing electromagnetic pollution, more and more attention has been paid to the research on the preparation and performance of electromagnetic shielding materials. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B9/00B32B27/20B32B27/08B32B27/14B32B37/02B32B38/00B32B38/16
CPCB32B9/007B32B27/08B32B27/14B32B27/20B32B37/02B32B38/00B32B38/16B32B2264/108B32B2305/30B32B2307/212B32B2313/04B32B2457/00
Inventor 白树林韩东张亚飞
Owner PEKING UNIV
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