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Light flexible graphene/polymer foam electromagnetic shielding material, preparation method and application thereof

A technology of electromagnetic shielding material and flexible graphite, which is applied in the field of lightweight flexible graphene/polymer foam electromagnetic shielding material and its preparation and application, can solve the problem of reduced electrical conductivity and electromagnetic shielding performance, only slightly higher electromagnetic shielding performance, and easy brittleness Eliminate cracking and other problems, achieve excellent electrical conductivity and electromagnetic shielding performance, excellent electromagnetic shielding performance, and simplify the preparation process

Active Publication Date: 2015-04-22
INST OF METAL RESEARCH - CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the conductive network of carbon materials in the resulting foam composites will inevitably be damaged during the foaming process, resulting in reduced electrical conductivity and electromagnetic shielding performance, and the large pores in the foam composites often make them prone to embrittlement and cracking
Due to the above reasons, the electromagnetic shielding performance per unit density of most foam composite materials is only slightly higher than that of commonly used metal materials

Method used

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  • Light flexible graphene/polymer foam electromagnetic shielding material, preparation method and application thereof
  • Light flexible graphene/polymer foam electromagnetic shielding material, preparation method and application thereof
  • Light flexible graphene/polymer foam electromagnetic shielding material, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] This embodiment introduces the method for synthesizing graphene / silicone rubber foam composite material, and specific scheme comprises the following steps:

[0036](1) Provide a graphene-covered metal foam (graphene / metal foam composite) and a polymer precursor solution.

[0037] The method for obtaining the graphene / metal foam composite is the chemical vapor deposition method, which catalyzes the cracking of carbon source gas on the surface of the three-dimensional porous metal foam to grow three-dimensional connected graphene. The conductivity of the graphene foam obtained by adjusting a series of process parameters is 0.5-100S / cm, and the average number of layers is 1-100 layers. In this embodiment, the conductivity is optimized to 2S / cm, and the average number of layers is 8 layers.

[0038] In the present invention, the metal foam used is foamed nickel, foamed copper, foamed iron or foamed cobalt, etc., and its pore size is distributed at 50-200PPI, and the prefer...

Embodiment 2

[0046] This example introduces a method for synthesizing a graphene / plexiglass (PMMA) foam composite material, and the specific scheme includes the following steps:

[0047] (1) Provide a graphene-covered metal foam (graphene / metal foam composite) and a polymer precursor solution.

[0048] The method for obtaining the graphene / metal foam composite is the chemical vapor deposition method, which catalyzes the cracking of carbon source gas on the surface of the three-dimensional porous metal foam to grow three-dimensional connected graphene. The conductivity of the graphene foam obtained by adjusting a series of process parameters is 0.5-100S / cm, and the average number of layers is 1-100 layers. In this embodiment, the conductivity is optimized to 2S / cm, and the average number of layers is 8 layers.

[0049] In the present invention, the metal foam used is foamed nickel, foamed copper, foamed iron or foamed cobalt, etc., and its pore size is distributed at 50-200PPI, and the pre...

Embodiment 3

[0056] This embodiment introduces the method for synthesizing graphene / silicone rubber foam composite material, and specific scheme comprises the following steps:

[0057] (1) Provide a graphene-covered metal foam (graphene / metal foam composite) and a polymer precursor solution.

[0058] The method for obtaining the graphene / metal foam composite is the chemical vapor deposition method, which catalyzes the cracking of carbon source gas on the surface of the three-dimensional porous metal foam to grow three-dimensional connected graphene. The conductivity of the graphene foam obtained by adjusting a series of process parameters is 0.5-100S / cm, and the number of layers is 1-100. In this embodiment, the conductivity is optimized to be 1.7S / cm, and the average number of layers is 1-2.

[0059] In the present invention, the metal foam used is foamed nickel, foamed copper, foamed iron or foamed cobalt, etc., and its pore size distribution is 50-200PPI, and the preferred range is 60-...

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Abstract

The invention relates to the field of graphene-based foam composites, in particular to a light flexible graphene / polymer foam electromagnetic shielding material, and a preparation method and an application thereof. The preparation method comprises the steps that three-dimensional full-communicated metal foam grown with graphene and a high molecular polymer precursor are adopted; a graphene / metal foam complex is mixed with the high molecular polymer precursor to ensure that the surface of the graphene / metal foam complex is coated with a layer of high molecular polymer precursor; the high molecular polymer precursor in a mixture is cured and then dissolved to remove a porous metal base; and then the light flexible graphene / polymer foam electromagnetic shielding material is obtained. The graphene / polymer foam composite has very low density and good flexibility, and graphene in the graphene / polymer foam composite forms a full-communicated network in a seamless connection manner, so that the composite has excellent conductivity and electromagnetic shielding property, and can be widely applied to the fields of aerospaces, portable electronic devices and the like.

Description

Technical field: [0001] The invention relates to the field of graphene-based foam composite materials, specifically a light flexible graphene / polymer foam electromagnetic shielding material and its preparation and application. A three-dimensional fully connected graphene network is used as a conductive additive for foam composite materials to construct A foam composite material with a three-dimensional highly conductive fully connected network can be widely used as a high-performance electromagnetic shielding material in aerospace, portable electronic devices and other fields. Background technique: [0002] The rapid development of modern electronic devices brings great convenience to human life, but it also produces serious electromagnetic radiation problems, which have a serious impact on high-precision electronic equipment and human physical and mental health. The development of high-performance electromagnetic shielding materials is of great significance to solve the abo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L83/04C08L21/00C08L75/04C08L63/00C08L91/06C08L77/00C08L33/12C08L79/08C08L23/06C08L25/06C08L23/12C08K3/04C08J9/26
Inventor 任文才陈宗平徐川马超群成会明
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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