A kind of multi-layer electromagnetic shielding composite material based on isolation structure and its preparation method and application

A technology of electromagnetic shielding and composite materials, applied in the fields of magnetic field/electric field shielding, chemical instruments and methods, lamination, 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: 2022-06-07
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A kind of multi-layer electromagnetic shielding composite material based on isolation structure and its preparation method and application
  • A kind of multi-layer electromagnetic shielding composite material based on isolation structure and its preparation method and application
  • A kind of multi-layer electromagnetic shielding composite material based on isolation structure and its preparation method and application

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preparation example Construction

[0087] The invention provides a preparation method of electromagnetic shielding composite material, comprising the following steps:

[0088] 1) Mixing filler A and solvent, then adding filler B to continue mixing, then adding ferric chloride, alkali and hydrazine hydrate and mixing again, and reacting to obtain a modified filler;

[0089] 2) After stirring and mixing the modified filler and resin obtained in the above steps, hot pressing is performed to obtain a modified resin layer with an isolation structure;

[0090] 3) Compounding the plasma-treated metal nanowire dispersion on the modified resin layer with an isolation structure to obtain an electromagnetic shielding composite material.

[0091] The selection and composition of the raw materials required in the above-mentioned preparation process, as well as the corresponding optimization principles, in the present invention can correspond to the selection and composition of the corresponding raw materials in the electrom...

Embodiment 1

[0139] 1) Preparation of modified filler:

[0140] First, 1 g of graphene nanosheets were added to methanol for ultrasonic dispersion for 3 hours, then 1 g of graphene oxide was added, and the ultrasonic wave was continued for 3 hours. After stirring for 4 h, the above mixture was transferred to an autoclave and treated at 200 °C for 16 h. Finally, filter and wash after cooling to room temperature, and dry at 120°C to obtain the final modified filler.

[0141] 2) Preparation of absorbing layer:

[0142] Weigh 7g of polyethylene resin and 3g of modified filler and mix in a mixer, and then hot-press at a temperature of 140°C and a pressure of 1MPa to obtain a 200um film, that is, the absorption layer.

[0143] 3) Preparation of absorption / reflection layer:

[0144] The silver nanowires (length: 50um; diameter: 50nm) were dispersed in ethanol at a concentration of 10mg / ml, the obtained film was treated with plasma for 60s, and then the silver nanowire dispersion was sprayed on...

Embodiment 2

[0157] 1) Preparation of modified filler:

[0158] First, 1 g of flake graphite was added to ethanol for ultrasonic dispersion for 1 h, then 0.5 g of acidified carbon nanotubes were added, and the ultrasonic wave was continued for 1 h. 5 g of ferric chloride, 15 g of potassium hydroxide and 0.625 g of hydrazine hydrate were respectively added to the above dispersion and stirred For 2 h, the above mixture was transferred to an autoclave and treated at 160 °C for 8 h. Finally, filter and wash after cooling to room temperature, and dry at 80°C to obtain the final modified filler.

[0159] 2) Preparation of absorbing layer:

[0160] 9g of polypropylene was weighed and mixed with 1g of modified filler in a mixer, and then hot-pressed at a temperature of 170°C and a pressure of 0.5MPa to obtain a film with a thickness of 50um, that is, an absorption layer.

[0161] 3) Preparation of absorption / reflection layer:

[0162] Gold nanowires (length: 10um; diameter: 200nm) were disperse...

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Abstract

The invention provides an electromagnetic shielding composite material, comprising an absorbing layer and a reflective layer compounded on the absorbing layer; the absorbing layer includes a modified resin layer; the modified resin layer has an isolation structure; the reflective layer includes a metal nanowire film. The invention adopts a specific layer material, combined with a laminated structure of absorbing layer-reflecting layer, and the absorbing layer is a special isolation structure, and obtains an electromagnetic shielding composite material with a specific structure and composition. The present invention can have many advantages such as high electromagnetic shielding efficiency, low electromagnetic wave reflection and excellent mechanical properties, and the absorbing layer is a special isolation structure, which can promote the overlapping of fillers inside the absorbing layer to form a filler network to maximize the The shielding efficiency of the absorbing layer further reduces the reflection of the composite material on electromagnetic waves. The electromagnetic shielding composite material can replace the traditional electromagnetic shielding composite material and be used in the emerging 5G communication field and aerospace field.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic shielding materials, and relates to an electromagnetic shielding composite material, a preparation method and application thereof, and in particular to a multilayer electromagnetic shielding composite material based on an isolation structure, a preparation method and application thereof. Background technique [0002] The development of electronic information technology brings great convenience to people, but also produces a lot of electromagnetic pollution. A large amount of electromagnetic pollution affects the normal operation of instruments and equipment, especially the emerging 5G communication field and aerospace field 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B27/32B32B27/20B32B27/06B32B27/30B32B27/40B32B27/28B32B33/00B32B37/06B32B37/10B32B37/00C08L23/06C08L23/12C08L27/06C08L27/16C08L75/04C08L71/12C08K9/02C08K3/04C08K7/28C08K7/00C08K3/14C08K3/08C08J5/18C08J7/12C08J7/06H05K9/00
CPCB32B27/32B32B27/20B32B27/08B32B27/304B32B27/40B32B27/285B32B33/00B32B37/06B32B37/10B32B37/00C08J5/18C08J7/123C08J7/06H05K9/0081C08J2323/06C08J2323/12C08J2327/06C08J2327/16C08J2375/04C08J2371/12C08K9/02C08K3/042C08K3/04C08K3/041C08K7/28C08K7/00C08K3/14C08K2003/0862B32B2037/243B32B2255/10B32B2255/205B32B2307/212B32B2605/18
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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