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Method for composite preparation of high-conductivity and high electromagnetic shielding flexible composite materials through adoption of graphene sponge and polydimethylsiloxane

A polydimethylsiloxane, graphene sponge technology, applied in the fields of magnetic field/electric field shielding, electrical components, etc., can solve the problems of poor flexibility, size equipment limitations, etc., and achieve the effect of good electromagnetic shielding performance and good flexibility

Active Publication Date: 2017-08-11
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The present invention solves the problem that existing graphene sponge products are limited in size by equipment and has poor flexibility; it provides a method for compounding highly conductive and high electromagnetic shielding flexible composite materials using graphene sponge and polydimethylsiloxane

Method used

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  • Method for composite preparation of high-conductivity and high electromagnetic shielding flexible composite materials through adoption of graphene sponge and polydimethylsiloxane
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  • Method for composite preparation of high-conductivity and high electromagnetic shielding flexible composite materials through adoption of graphene sponge and polydimethylsiloxane

Examples

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Embodiment 1

[0034] This example involves the problem that existing graphene sponge products are limited by equipment in size and poor in flexibility. Provide a method for compounding graphene sponge and polydimethylsiloxane to prepare flexible composite materials with high conductivity and high electromagnetic shielding:

[0035]1. Preparation of graphene oxide: 20g of natural flake graphite was added to sulfuric acid and phosphoric acid to prepare a mixture, and stirred at 500r / min for 40min. Add potassium permanganate 7 times afterwards (time interval is 20min), adjust stirring temperature and speed to be 35 ℃, 500r / min, and be placed in the constant temperature stirring of 5h in the water bath, then add the stirring mixture to ice water, and add to Add hydrogen peroxide with a mass fraction of 30% in ice water to obtain a graphene suspension, and finally filter the graphene oxide suspension, centrifuge and wash to obtain graphene oxide, and finally dilute it with deionized water at a co...

Embodiment 2

[0052] This example involves the problem that existing graphene sponge products are limited by equipment in size and poor in flexibility. Provide a method for compounding graphene sponge and polydimethylsiloxane to prepare flexible composite materials with high conductivity and high electromagnetic shielding:

[0053] 1. Preparation of graphene oxide: 200g of natural flake graphite was added to sulfuric acid and phosphoric acid to prepare a mixture, and stirred at 500r / min for 60min. Add potassium permanganate 8 times afterwards (time interval is 20min), adjust stirring temperature and speed to be 50 ℃, 800r / min, and be placed in the constant temperature stirring of 18h in the water bath, then the stirring mixture is added to ice water, and to Add hydrogen peroxide with a mass fraction of 30% in ice water to obtain a graphene suspension, and finally filter the graphene oxide suspension, centrifuge and wash to obtain graphene oxide, and finally dilute it with deionized water at ...

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Abstract

The present invention belongs to a method for composite preparation of high-conductivity and high electromagnetic shielding flexible composite materials through adoption of graphene sponge and polydimethylsiloxane, belonging to the technical field of high-conductivity flexible composite materials. The objective of the invention is to solve the problems that current graphene sponge products are limited in size by a device and bad in flexibility. The method comprises: 1, preparing oxidized grapheme sponge; 2, performing reduction of the oxidized grapheme sponge through adoption of hydrazine hydrate vapor; 3; performing compression; 4, performing heat treatment; 5, pouring in PDMS solution; and 6, performing vacuum solidification to namely obtain PDMS / grapheme sponge composite materials. The PDMS / grapheme sponge composite materials obtained in the invention have good flexibility and a good electromagnetic shielding performance which can reach 59dB (2mm), the electrical conductivity of the PDMS / grapheme sponge composite materials is 1.03S / cm, and the PDMS / grapheme sponge composite materials have the utilization potentiality in the electromagnetic shielding field; and moreover, the preparation method can be widely applied in the industrial production.

Description

technical field [0001] The invention belongs to the technical field of highly conductive and flexible composite materials; in particular, it relates to a method for compounding and preparing highly conductive and high electromagnetic shielding flexible composite materials by using graphene sponge and polydimethylsiloxane. Background technique [0002] Graphene has only one layer of carbon atoms and is tightly packed into a two-dimensional honeycomb lattice structure. Each carbon atom forms a covalent bond with three adjacent carbon atoms. Each carbon atom in graphene has one s orbital and three p orbitals, among which the s orbital and two p orbitals form chemical bonds with the surrounding three adjacent carbon atoms, which do not contribute to the conductivity of graphene, while the remaining One p orbital is hybridized with each other to form valence band and conduction band, which affects the electrical properties of graphene. This unique two-dimensional structure endow...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05K9/00C08L83/04C08K9/02C08K3/04C08K9/04
CPCC08K3/04C08K9/02C08K9/04H05K9/0081C08L83/04
Inventor 李宜彬陈若凡徐帆赫晓东彭庆宇林在山
Owner HARBIN INST OF TECH
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