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Multilayer electromagnetic shielding composite material based on bicontinuous structure and preparation method and application thereof

A composite material and electromagnetic shielding technology, which is applied in the fields of magnetic/electric field shielding, chemical instruments and methods, coatings, etc., can solve problems such as the mismatch between composite materials and air impedance, the reduction of mechanical properties of composite materials, and the inability to meet practical applications. Achieve the effects of improving shielding efficiency, high electromagnetic shielding effectiveness, and excellent mechanical properties

Active Publication Date: 2021-05-04
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, the addition of a large amount of fillers in the resin matrix will cause the impedance mismatch between the composite material and the air, resulting in a large amount of electromagnetic reflection, resulting in secondary electromagnetic wave pollution
At the same time, the addition of a large amount of fillers in the resin matrix will also lead to a great reduction in the mechanical properties of the composite material, which cannot meet the practical application requirements.

Method used

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  • Multilayer electromagnetic shielding composite material based on bicontinuous structure and preparation method and application thereof
  • Multilayer electromagnetic shielding composite material based on bicontinuous structure and preparation method and application thereof
  • Multilayer electromagnetic shielding composite material based on bicontinuous structure and preparation method and application thereof

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preparation example Construction

[0091] The invention provides a method for preparing an electromagnetic shielding composite material, comprising the following steps:

[0092] 1) Mix the filler A with the solvent, then add the filler B to continue mixing, then add ferric chloride, alkali and hydrazine hydrate and mix again, then react to obtain the modified filler;

[0093] 2) Extrude and granulate the modified filler and resin A obtained in the above steps to obtain modified resin A, and then re-extrude and granulate modified resin A and resin B to obtain a double continuous structure modified resin ;

[0094] 3) After hot pressing the bicontinuous structure modified resin obtained in the above steps, a bicontinuous structure modified resin layer is obtained;

[0095] 4) Composite the metal nanowire dispersion liquid after plasma treatment on the bicontinuous structure modified resin layer to obtain the electromagnetic shielding composite material.

[0096] In the present invention, the selection and compo...

Embodiment 1

[0148] 1) Preparation of modified filler:

[0149] First, add 1 g of graphene nanosheets to methanol for ultrasonic dispersion for 3 h, then add 1 g of graphene oxide, continue ultrasonication for 3 h, add 30 g of ferric chloride, 150 g of sodium hydroxide and 3.75 g of hydrazine hydrate to the above dispersion Stirring for 4 hours, the above mixture was transferred to an autoclave and treated at 200°C for 16 hours. Finally, filter and wash after cooling down to room temperature, and dry at 120°C to obtain the final modified filler.

[0150] 2) Preparation of double continuous structure modified resin:

[0151] Weigh 2g of polyethylene and 3g of modified filler, and extrude and granulate through extruder at a temperature of 160-220° C. and a rotational speed of 30 rpm to obtain modified polyethylene. 5 g of polyurethane and 5 g of modified polyethylene were extruded and granulated through an extruder at a temperature of 160-220° C. and a rotational speed of 30 rpm to obtain ...

Embodiment 3

[0178] 1) Preparation of modified filler:

[0179] First, add 1g of expanded graphite into ethylene glycol and ultrasonically disperse for 2h, then add 0.75g of graphene oxide, continue ultrasonication for 2h, add 15g of ferric chloride, 60g of sodium hydroxide and 1.67g of hydrazine hydrate into the above dispersion After stirring for 3 h, the above mixed solution was transferred to an autoclave and treated at 180° C. for 12 h. Finally, filter and wash after cooling down to room temperature, and dry at 100°C to obtain the final modified filler.

[0180] 2) Preparation of double continuous structure modified resin:

[0181] 3g of polyvinylidene fluoride and 2g of modified filler were weighed, and the modified polyvinylidene fluoride was obtained by extruding and pelletizing at a temperature of 190-230° C. and a rotational speed of 30 rpm. 5 g of polyurethane and 5 g of modified polyvinylidene fluoride are extruded and granulated through an extruder at a temperature of 190-23...

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Abstract

The invention provides an electromagnetic shielding composite material. The electromagnetic shielding composite material comprises an absorbing layer and a reflecting layer compounded on the absorbing layer, the absorbing layer comprises a modified resin layer with a bicontinuous structure; and the reflecting layer comprises a metal nanowire film layer. According to the electromagnetic shielding composite material, the specific layer material is adopted, the absorption layer is of the special bicontinuous structure, the absorption layer-reflection layer stacked structure is combined, and the electromagnetic shielding composite material with the specific structure and composition is obtained. The composite material has the advantages of high electromagnetic shielding effectiveness, low electromagnetic wave reflection, excellent mechanical property and the like, the special bicontinuous structure of the absorption layer can promote mutual lap joint of fillers in the absorption layer to form a filler network, the shielding efficiency of the absorption layer is further improved, and reflection of the composite material to electromagnetic waves is further reduced. The composite material can replace a traditional electromagnetic shielding composite material to be applied to the fields of emerging 5G communication and aerospace.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic shielding materials, and relates to an electromagnetic shielding composite material and its preparation method and application, in particular to a double-continuous structure-based multilayer electromagnetic shielding composite material and its preparation method and application. Background technique [0002] The development of electronic information technology has brought great convenience to people, but also produced a lot of electromagnetic pollution. A large amount of electromagnetic pollution affects the normal operation of instruments and equipment, especially the emerging 5G communication and aerospace have stricter requirements on the anti-interference ability of signals. Therefore, various electromagnetic shielding composite materials have been developed. [0003] Traditional electromagnetic shielding composite materials mostly use a blending process to mix polymer resins and fil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/08B32B27/20B32B27/28B32B27/30B32B27/32B32B27/40H05K9/00C08L75/04C08L23/06C08L23/12C08L27/16C08L71/12C08K9/02C08K9/04C08K3/04C08K3/08C08J7/06
CPCB32B27/08B32B27/20B32B27/40B32B27/32B32B27/304B32B27/285H05K9/0088C08J7/06C08L75/04C08L27/16C08K2201/011C08J2375/04C08K2003/0862B32B2250/05B32B2375/00B32B2327/12C08L23/06C08L23/12C08L71/12C08K9/02C08K9/04C08K3/042C08K3/041C08K3/08C08K7/24C08K3/14
Inventor 冉祥海王春博付超聂伟钱景高一星楚慧颖
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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