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A kind of electromagnetic shielding foam composite material and preparation method based on graphene oxide and polymer

A composite material and graphene technology, which is applied in the field of preparation of graphene oxide and flexible polymer foam composite materials, can solve the problems of insufficient flexibility and low electromagnetic shielding performance, and achieve excellent mechanical and electromagnetic shielding performance and low content requirements , the effect of simple compound process

Active Publication Date: 2019-10-18
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims at the deficiencies of insufficient flexibility and low electromagnetic shielding performance of existing graphene foam materials, and provides a preparation method of a foam composite material with excellent electromagnetic shielding performance and flexibility

Method used

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  • A kind of electromagnetic shielding foam composite material and preparation method based on graphene oxide and polymer
  • A kind of electromagnetic shielding foam composite material and preparation method based on graphene oxide and polymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Freeze-dry the neutral graphene oxide aqueous dispersion to obtain graphene oxide powder, add 100 mg of graphene oxide powder to 20 g of deionized water, and place them in a cell pulverizer for 20 minutes at a power of 20 W to obtain a mass Graphene oxide aqueous dispersion with a fraction of 0.05%; cut the open-cell polyurethane foam into 9.9g cubes, soak it in the above-mentioned graphene oxide aqueous dispersion, repeatedly extrude the polyurethane foam to make the graphene oxide aqueous dispersion uniform Adsorbed in the pores of the polyurethane foam, the mass ratio of the polyurethane foam to graphene oxide is 99:1, and after vacuum drying, the foam composite material based on graphene oxide is obtained; the above-mentioned foam composite material based on graphene oxide is placed In a hydrazine hydrate solution with a mass fraction of 0.5%, reflux at 60° C. for 3 h, wash with water, and dry to obtain a foam composite material based on reduced graphene oxide. The ...

Embodiment 2

[0028]Freeze-dry the neutral graphene oxide aqueous dispersion to obtain graphene oxide powder, add 100 mg of graphene oxide powder to 20 g of deionized water, and place them in a cell pulverizer for 3 minutes at a power of 200 W to obtain a mass Graphene oxide aqueous dispersion with a fraction of 0.05%; cut the open-cell polyurethane foam into 9.9g cubes, soak it in the above-mentioned graphene oxide aqueous dispersion, repeatedly extrude the polyurethane foam to make the graphene oxide aqueous dispersion uniform Adsorbed in the pores of the polyurethane foam, the mass ratio of the polyurethane foam to graphene oxide is 99:1, and after vacuum drying, the foam composite material based on graphene oxide is obtained; the above-mentioned foam composite material based on graphene oxide is placed In a hydrazine hydrate solution with a mass fraction of 1%, reflux at 80° C. for 3 h, wash with water, and dry to obtain a foam composite material based on reduced graphene oxide. The obt...

Embodiment 3

[0030] Freeze-dry the neutral graphene oxide aqueous dispersion to obtain graphene oxide powder, add 100 mg of graphene oxide powder to 20 g of deionized water, and place them in a cell pulverizer for 10 minutes at a power of 100 W to obtain a mass Graphene oxide aqueous dispersion with a fraction of 0.05%; cut the open-cell polyurethane foam into 9.9g cubes, soak it in the above-mentioned graphene oxide aqueous dispersion, repeatedly extrude the polyurethane foam to make the graphene oxide aqueous dispersion uniform Adsorbed in the pores of the polyurethane foam, the mass ratio of the polyurethane foam to graphene oxide is 99:1, and after vacuum drying, the foam composite material based on graphene oxide is obtained; the above-mentioned foam composite material based on graphene oxide is placed In a hydrazine hydrate solution with a mass fraction of 40%, reflux at 120° C. for 0.5 h, wash with water, and dry to obtain a foam composite material based on reduced graphene oxide. T...

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Abstract

The invention relates to a graphene oxide and polymer based electromagnetic shielding foam composite material and a preparation method thereof. Flexible polymer foams are selected and are immersed in a graphene oxide aqueous dispersion, then the immersed polymer foams are dried and reduced, and a layer of three-dimensional continuous graphene film structure is formed between a foam skeleton and a skeleton. The graphene film between the skeletons is conducive to improving the electromagnetic wave reflecting surface and beneficial to electromagnetic wave absorption. Through compounding and reduction of the polymer foams and graphene oxide, compounding of flexible polymer foams and graphene with high electromagnetic shielding properties can be realized, the three-dimensional continuous network structure of the polymer foams and graphene guarantees maximization of mechanical and electromagnetic shielding properties, under 80% compressive strain, the obtained foam composite material is compressed repeatedly for 1000 times, the recovery rate is greater than or equal to 95%, and the electromagnetic shielding effectiveness is greater than or equal to 40dB. The method provided by the invention has a simple compounding process, and can realize large-scale production.

Description

technical field [0001] The invention relates to a preparation method of a foam material with high electromagnetic shielding and flexibility, in particular to a preparation method of graphene oxide and flexible polymer foam composite material. Background technique [0002] With the rapid development of science and technology, large computers, notebook computers and many other electronic devices have brought great convenience to human life, but also produced serious electromagnetic radiation, which caused electromagnetic pollution and electromagnetic interference to high-precision electronics. Equipment and human physical and mental health have had serious impacts. In order to solve this problem, various high-performance metal-based electromagnetic shielding materials have been continuously developed. However, in addition to high electromagnetic shielding performance, light weight and flexibility are two other important technical requirements for electromagnetic shielding app...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/40C08L75/04C08L83/04C08L79/08
Inventor 封伟秦盟盟冯奕钰
Owner TIANJIN UNIV
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