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

A composite material, electromagnetic shielding technology, used in magnetic field/electric field shielding, conductive adhesives, chemical instruments and methods, etc., can solve the problems of strong anisotropy, low electromagnetic shielding efficiency, etc. Electromagnetic shielding effectiveness and the effect of improving mechanical properties

Active Publication Date: 2022-08-09
XIDIAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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] The preparation method of the flexible composite material with high electromagnetic shielding performance includes the following steps:

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

[0041] The polymer is a thermoplastic elastomer, and the thermoplastic elastomer includes: hydrogenated styrene-butadiene block copolymer (SEBS), styrene-butadiene-styrene block copolymer (SBS), polyacrylate, polyester , any one of EPDM rubber, nitrile rubber and butyl rubber;

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

[0043] Step 2: adding 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%, and at 20 ℃~40...

Embodiment 1

[0058] The preparation method of the flexible composite material with high electromagnetic shielding performance includes the following steps:

[0059] (1) Add 30 g of hydrogenated styrene-butadiene block copolymer to 600 g of dimethylformamide, and magnetically stir 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 into the polymer solution at a volume ratio of 3:7, and mechanically stir at a stirring rate of 125 r / min at a temperature of 30°C 7h, a mixed emulsion was obtained.

[0061] (3) Under the condition of room temperature, the mixed emulsion was cast on the PET film tape substrate, the movement speed of the push rod during the casting process was 1.25mm / s, and the thickness of the cast material was controlled by adjusting the height of the scraper of the casting machine. 1.75mm, transfer the substrate carrying the cast mater...

Embodiment 2

[0069] The preparation method of the flexible composite material with high electromagnetic shielding performance includes the following steps:

[0070] (1) 40 g of polyacrylate was added to 400 g of acetone, and magnetically stirred 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 the gallium indium eutectic alloy (EGaIn) liquid metal with a melting point of 15°C into 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) Under the condition of room temperature, the mixed emulsion is cast on the glass substrate, the movement speed of the push rod is 0.5mm / s during the casting process, the thickness of the cast material is controlled to be 0.5mm, and the cast material is loaded with the cast material. The substrate was transferred to a vacuum oven, vacuumed, and then vacuum-dried at a temperature ...

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Abstract

The invention discloses a flexible composite material with high electromagnetic shielding performance and a preparation method thereof, comprising: obtaining a polymer solution; adding liquid metal into the polymer solution, and obtaining a mixed emulsion through mechanical stirring; casting the mixed emulsion to obtain a mixed emulsion Liquid metal particle / polymer composite material; the obtained material is equibiaxially stretched, fixed and heat-treated, and the stretched state is retained to obtain a liquid metal flake / polymer composite material; a layer of mixed emulsion is cast on the upper surface of the obtained material, And lamination treatment is carried out; casting and lamination are repeated, and the obtained material is then subjected to hot pressing treatment and heating curing to obtain a flexible composite material with high electromagnetic shielding performance. The flexible composite material with high electromagnetic shielding performance and the preparation method thereof realize the combination of flexibility and high electromagnetic shielding performance, the electromagnetic shielding performance of the prepared material is isotropic, and has excellent flexibility and stretchability, and has a wide range of 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 the 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 the continuous increase of power density. The electromagnetic waves generated in electronic components and micro- and nano-scale interconnected circuits have also increased significantly. The electromagnetic interference caused by this has seriously affected the stability and safety of device operation, and polluted the living environment and endangered human health. In order to prevent the harm caused by...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B25/14B32B25/04B32B7/12B32B27/30B32B27/06B32B27/18B32B27/36B32B25/18C08J5/18C08L53/02C08L33/04C08K3/08C09J153/02C09J11/04C09J9/02H05K9/00
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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