Flexible high-frequency electromagnetic shielding material with dual-network structure, and preparation method thereof

A high-frequency electromagnetic and shielding material technology, applied in the fields of magnetic/electric field shielding, electrical components, etc., can solve the problems of high conductive filler content, surface coating instability limiting application, affecting the lightweight and flexible properties of polymer matrix, etc. Achieve the effect of improving modulus and strength, excellent electromagnetic shielding effect, and excellent electromagnetic shielding effect

Inactive Publication Date: 2019-02-01
SOUTHWEST UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The commonly used preparation methods are surface coating method and conductive filler filling method. Although the surface coating method is uniform and controllable, the preparation process is lengthy and complicated, and the instability of the surface coating limits its application.
The conductive filler filling method is the most widely used, but the study found that the improvement of electromagnetic shielding by simply adding conductive fillers is very limited, and high electromagnetic shielding often requires a higher content of conductive fillers, which affects the original polymer matrix. Flexibility

Method used

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  • Flexible high-frequency electromagnetic shielding material with dual-network structure, and preparation method thereof
  • Flexible high-frequency electromagnetic shielding material with dual-network structure, and preparation method thereof
  • Flexible high-frequency electromagnetic shielding material with dual-network structure, and preparation method thereof

Examples

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Effect test

Embodiment 1

[0035] A flexible high-frequency electromagnetic shielding material with a double network structure, which consists of the following components in parts by mass: 8 parts of single-walled carbon nanotubes, 7 parts of cotton fibers, and 33 parts of polydimethylsiloxane. The high-frequency electromagnetic shielding material was prepared as follows: 8 parts of single-walled carbon nanotubes, 7 parts of cotton fibers and 33 parts of polydimethylsiloxane prepolymer were added to dichloromethane and mixed by mechanical stirring, and then press 10% of the weight of the dimethylsiloxane prepolymer is added with a curing agent, and the dichloromethane is removed under a vacuum condition of 45°C after being mixed again by mechanical stirring, and finally put into a mold, and molded at 100°C to produce Obtain flexible high-frequency electromagnetic shielding materials. After testing, the electromagnetic shielding effectiveness of the flexible high-frequency electromagnetic shielding mater...

Embodiment 2

[0037] A flexible high-frequency electromagnetic shielding material with a double network structure consists of the following components in parts by mass: 5 parts of multilayer graphene, 15 parts of nylon fiber, and 60 parts of polydimethylsiloxane. The high-frequency electromagnetic shielding material was prepared as follows: 5 parts of multilayer graphene, 15 parts of nylon fiber and 60 parts of polydimethylsiloxane prepolymer were added into tetrahydrofuran and mixed by ultrasonic, and then pressed by dimethylsiloxane 10% of the weight of the alkane prepolymer is added with a curing agent, and the tetrahydrofuran is removed under a vacuum condition of 45°C after ultrasonic mixing again, and finally put into a mold and molded at 100°C to obtain a flexible high-frequency electromagnetic shielding material. After testing, the electromagnetic shielding effectiveness of the flexible high-frequency electromagnetic shielding material in the X-band can reach ~35dB, that is, the comp...

Embodiment 3

[0039]A flexible high-frequency electromagnetic shielding material with a double network structure consists of the following components in parts by mass: 6 parts of single-walled carbon nanotubes, 30 parts of polypropylene fibers, 70 parts of polydimethylsiloxane, the The flexible high-frequency electromagnetic shielding material was prepared as follows: 6 parts of single-walled carbon nanotubes, 30 parts of polypropylene fibers and 70 parts of polydimethylsiloxane prepolymer were added to acetone and mixed by mechanical stirring, and then press 10% of the weight of the dimethylsiloxane prepolymer is added with a curing agent, and the acetone is removed under a vacuum condition of 45°C after mechanical stirring and mixing again, and finally put into a mold and molded at 100°C to obtain a flexible High frequency electromagnetic shielding material. After testing, the electromagnetic shielding effectiveness of the flexible high-frequency electromagnetic shielding material in the ...

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Abstract

The invention relates to a flexible high-frequency electromagnetic shielding material with a dual-network structure, and a preparation method thereof, and belongs to the technical field of electromagnetic shielding materials. The material comprises, by mass, 3-10 parts of conductive particles, 7-48 parts of insulating lightweight fibers and 32-88 parts of a flexible polymer material. The conductive particles and the insulating lightweight fibers are added to the flexible polymer material in order to construct a conductive network and a fiber network which are interpenetrated in the flexible polymer material, electron migration of the conductive network is used to reflect and absorb electromagnetic waves, and the interfacial multistage reflection and interference of the fiber network are used to lose the electromagnetic waves, so the finally produced material has an excellent electromagnetic shielding effect. Additionally, the use amounts of all the components in the flexible high-frequency electromagnetic shielding material are controlled to ensure that the material have an excellent electromagnetic shielding effect and ensure the improvement of the modulus and the strength of thematerial without significantly reducing the flexibility of the material, so the material can be widely applied to industries.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic shielding materials, and in particular relates to a flexible high-frequency electromagnetic shielding material with a double network structure and a preparation method thereof. Background technique [0002] With the development of science and technology, various electrical appliances enrich people's life. Such as computers, mobile phones, etc. improve work efficiency and facilitate communication; such as induction cooker, microwave oven, etc., facilitate cooking, etc. When using these electrical products, they emit electromagnetic waves at any time, and they are always harmful to the human body. The phenomenon of electromagnetic waves launching or leaking into the air is called electromagnetic radiation, and electromagnetic radiation is closely related to people's health. Long-term exposure to electromagnetic radiation will cause damage to human health that cannot be ignored. Therefore, i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/04C08L1/02C08L77/00C08L23/12C08L75/04C08K7/00C08K3/04C08K7/24H05K9/00
CPCC08K2201/001C08K2201/011C08L75/04C08L83/04C08L2201/04C08L2205/16H05K9/0081C08L1/02C08K3/041C08L77/00C08K7/00C08K3/042C08L23/12
Inventor 王明李杰
Owner SOUTHWEST UNIVERSITY
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