Flexible composite material with high electromagnetic shielding performance and preparation method thereof

A composite material and electromagnetic shielding technology, which is applied in the fields of magnetic/electric field shielding, chemical instruments and methods, electrical components, etc., can solve the problems of low electromagnetic shielding efficiency and strong anisotropy, and achieve excellent electromagnetic shielding performance and enhanced bonding Sexuality and the effect of improving mechanical properties

Active Publication Date: 2021-10-22
XIDIAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In order to achieve the above purpose, the embodiment of the present invention provides a flexible composite material with high electromagnetic shielding performance and its preparation method, which realizes the combination of flexibility and high electromagnetic shielding performance, and the preparation method is easy to operate and easy to implement, and the obtained The structure of the liquid metal sheet / elastomer composite material is stable, the electromagnetic shielding effect is isotropic, and it maintains good electromagnetic shielding effect in the unstressed and stressed state, and has excellent flexibility and stretchability, and has a wide range of applications Foreground, solving the problems of low electromagnetic shielding effectiveness and strong anisotropy of composite materials based on liquid metal particles in the prior art

Method used

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  • Flexible composite material with high electromagnetic shielding performance and preparation method thereof
  • Flexible composite material with high electromagnetic shielding performance and preparation method thereof
  • Flexible composite material with high electromagnetic shielding performance and preparation method thereof

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preparation example Construction

[0039] A method for preparing a flexible composite material with high electromagnetic shielding performance, comprising the following steps:

[0040] Step 1: Add the polymer into the solvent at a mass ratio of 1:(10-30), and stir magnetically at a stirring rate of 100r / min-400r / min for 12h-48h at a temperature of 20°C-60°C, dissolving the polymer in a solvent to obtain a polymer solution;

[0041] The polymers are thermoplastic elastomers, thermoplastic elastomers include: hydrogenated styrene-butadiene block copolymer (SEBS), styrene-butadiene-styrene block copolymer (SBS), polyacrylate, polyester , EPDM rubber, nitrile rubber, butyl rubber in any one;

[0042] The solvent includes any one of dimethylformamide, dimethylacetamide, acetone, butanone.

[0043] Step 2: Add the liquid metal to the polymer solution at a volume ratio of (1~5):(5~9), the sum of the volume percentages of the liquid metal and the polymer solution is 100%, at 20°C~40°C Under temperature conditions, m...

Embodiment 1

[0058] A method for preparing a flexible composite material with high electromagnetic shielding performance, comprising the following steps:

[0059] (1) Add 30 g of hydrogenated styrene-butadiene block copolymer to 600 g of dimethylformamide, and stir magnetically at a stirring rate of 250 r / min for 30 h at a temperature of 40° C. to obtain a polymer solution.

[0060] (2) Add gallium-indium eutectic alloy (EGaIn) liquid metal with a melting point of 15°C to the polymer solution at a volume ratio of 3:7, and mechanically stir at a stirring rate of 125r / min at a temperature of 30°C After 7 hours, a mixed emulsion was obtained.

[0061] (3) At room temperature, the mixed emulsion is cast on the PET film strip substrate, the moving speed of the push rod is 1.25mm / s during the casting process, and the thickness of the cast material is controlled by adjusting the height of the scraper of the casting machine 1.75mm, the substrate loaded with castings was transferred to a vacuum ov...

Embodiment 2

[0069] A method for preparing a flexible composite material with high electromagnetic shielding performance, comprising the following steps:

[0070] (1) Add 40 g of polyacrylate into 400 g of acetone, and stir magnetically at a stirring rate of 100 r / min for 12 h at a temperature of 20° C. to obtain a polymer solution.

[0071] (2) Add gallium-indium eutectic alloy (EGaIn) liquid metal with a melting point of 15°C to the polymer solution at a volume ratio of 1:9, and mechanically stir at a stirring rate of 50r / min at a temperature of 20°C 2h, a mixed emulsion was obtained.

[0072] (3) At room temperature, the mixed emulsion is cast on the glass substrate. The substrate was transferred to a vacuum oven for vacuum treatment, and then vacuum-dried at a temperature of 60° C. for 4 hours to obtain a liquid metal particle / polymer composite material.

[0073] (4) Place and clamp the liquid metal particle / polymer composite on the equibiaxial stretching platform, firstly stretch th...

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Abstract

The invention discloses a flexible composite material with high electromagnetic shielding performance and a preparation method thereof. The preparation method comprises the following steps: obtaining a polymer solution; adding liquid metal into the polymer solution, and mechanically stirring to obtain a mixed emulsion; casting the mixed emulsion to obtain a liquid metal particle / polymer composite material; subjecting obtained material to isobiaxial stretching, fixing and heat treatment, so that the stretching state is kept, and a liquid metal sheet / polymer composite material is obtained; casting a layer of mixed emulsion on the upper surface of the obtained material, and carrying out lamination treatment; repeating casting and stacking, subjecting the obtained material to hot pressing treatment and heating curing, and obtaining the flexible composite material with the high electromagnetic shielding performance. According to the flexible composite material with the high electromagnetic shielding performance and the preparation method of the flexible composite material, combination of flexibility and the high electromagnetic shielding performance is achieved, the electromagnetic shielding effectiveness of the prepared material is isotropic, and the flexible composite material has excellent flexibility and stretchability and has wide application prospects.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic shielding, and relates to a flexible composite material with high electromagnetic shielding performance and a preparation method thereof. Background technique [0002] The development and popularization of fifth-generation communication technology, Internet of Things technology and flexible electronic technology will promote the development of electronic components in the direction of high frequency, miniaturization, multi-function, flexibility and high integration, which will lead to continuous increase in power density. The electromagnetic waves generated in electronic components and micro-nano-scale interconnected circuits have also increased significantly. The resulting electromagnetic interference seriously affects the stability and safety of device operation, and pollutes the living environment and endangers human health. In order to prevent the harm caused by electromagnetic interfe...

Claims

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Application Information

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IPC IPC(8): B32B25/14B32B25/04B32B7/12B32B27/30B32B27/06B32B27/18B32B27/36B32B25/18C08J5/18C08J7/04C08L53/02C08L33/04C08K3/08H05K9/00
CPCB32B25/14B32B25/042B32B7/12B32B27/308B32B27/08B32B27/18B32B27/36B32B25/18C08J5/18C08J7/0427H05K9/0083H05K9/0088B32B2250/24B32B2307/212C08J2353/02C08J2453/02C08J2333/04C08J2433/04C08K3/08Y02A30/00
Inventor 姚斌吕晓洲史尧光张维强
Owner XIDIAN UNIV
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