Light wide-frequency wave-absorbing material based on impedance metamaterial and preparation method of light wide-frequency wave-absorbing material

A technology of wave absorbing materials and metamaterials, applied in the field of wave absorbing materials, can solve the problems of narrow absorption frequency band, large thickness and large weight, and achieve the effect of absorbing broadband, thin thickness and light weight

Active Publication Date: 2019-10-29
BEIJING INST OF ENVIRONMENTAL FEATURES
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of heavy weight, narrow absorption frequency band and large thickness of traditional coating absorbing materials and composite structure absorbing materials in the past, the present invention provides a lightweight broadband absorbing material based on impedance metamaterials and its preparation method

Method used

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  • Light wide-frequency wave-absorbing material based on impedance metamaterial and preparation method of light wide-frequency wave-absorbing material
  • Light wide-frequency wave-absorbing material based on impedance metamaterial and preparation method of light wide-frequency wave-absorbing material
  • Light wide-frequency wave-absorbing material based on impedance metamaterial and preparation method of light wide-frequency wave-absorbing material

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preparation example Construction

[0029] In a first aspect, the present invention provides a method for preparing a lightweight broadband absorbing material based on impedance metamaterials, the method comprising the following steps:

[0030] (1) carbon nanotube powder is dispersed in the resin solution, is mixed with carbon nanotube slurry, then said carbon nanotube slurry is scraped on the polyimide film, obtains carbon nanotube coating film; In the present invention, the carbon nanotube slurry is scraped on the polyimide film to form a carbon nanotube coating film with certain resistance; in the present invention, the carbon nanotube coating film is made of polyimide A film and a carbon nanotube film are composed; the carbon nanotube film is formed by scraping the carbon nanotube slurry on the polyimide film (substrate);

[0031] (2) Etching (such as laser etching) a periodic structure composed of multiple (two and more) periodic structural units on the carbon nanotube coating film obtained in step (1), to ...

Embodiment 1

[0059] A lightweight broadband radar absorbing material based on impedance metamaterials is prepared. The lightweight broadband absorbing material is composed of impedance metamaterials and low-dielectric dielectric films, and has a two-layer structure, such as figure 1 As shown; the first layer is an impedance metamaterial with a thickness of d1 = 0.13mm, and the second layer is a low-dielectric film, the low-dielectric material used is polymethacrylimide PMI with a thickness of d2 = 4mm. Among them, the impedance metamaterial is to etch a periodic structure on the carbon nanotube coating film, the periodic structural unit is a regular hexagon, and the periodic structural unit and the formed periodic structural pattern are as follows: figure 2 As shown, a=3.7mm, b=4.75mm, c=8.66mm.

[0060] The preparation process of the lightweight broadband radar absorbing material based on impedance metamaterials is as follows:

[0061] S1. Preparation of carbon nanotube slurry

[0062]...

Embodiment 2

[0071] A lightweight broadband radar absorbing material based on impedance metamaterials is prepared. The lightweight broadband absorbing material is composed of impedance metamaterials and low-dielectric dielectric films, and has a two-layer structure, such as figure 1 As shown; the first layer is an impedance metamaterial with a thickness of d1 = 0.13mm, and the second layer is a low-dielectric film. The low-dielectric material used is polymethacrylimide PMI with a thickness of d2 = 8mm. Among them, the impedance metamaterial is to etch a periodic structure on the carbon nanotube coating film, the periodic structural unit is a regular hexagon, and the periodic structural unit and the formed periodic structural pattern are as follows: figure 2 As shown, a=3.7mm, b=4.75mm, c=8.66mm.

[0072] The preparation process of the lightweight broadband radar absorbing material based on impedance metamaterials is as follows:

[0073] S1. Preparation of carbon nanotube slurry

[0074] W...

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Abstract

The invention relates to a light wide-frequency wave-absorbing material based on an impedance metamaterial and a preparation method of the light wide-frequency wave-absorbing material. The preparationmethod comprises the following steps: (1) dispersing carbon nano tube powder into a resin solution to prepare carbon nano tube slurry, and then scraping the carbon nano tube slurry on a polyimide film to obtain a carbon nano tube coating film; (2) etching a periodic structure composed of a plurality of periodic structure units into the carbon nano tube coating film obtained in the step (1) to obtain an impedance metamaterial; and (3) bonding the impedance metamaterial obtained in the step (2) with a low-dielectric film through an adhesive, and then carrying out curing to prepare the light wide-frequency wave-absorbing material. The light wide-frequency wave-absorbing material has excellent wave-absorbing performance in a wave band of 8-18 GHz, the absorbing bandwidth reaches 10 GHz, and the light-weight wide-frequency wave-absorbing material has excellent characteristics of light weight, thin thickness and polarization insensitivity.

Description

technical field [0001] The invention belongs to the technical field of wave-absorbing materials, and in particular relates to a lightweight broadband wave-absorbing material based on impedance metamaterials and a preparation method thereof. Background technique [0002] With the development of microwave detection technology, the system has higher and higher requirements for the light weight and broadband absorption performance of microwave absorbing materials. Traditional absorbing materials such as ferrite, carbonyl iron powder, metal micropowder, etc., can only have absorbing performance in a narrow frequency range. Structural absorbing materials are the main technical means to achieve broadband stealth. Usually, absorbers such as graphite and carbon black are combined with FRP or foam to form a structural form with certain mechanical strength. However, the condition for structural absorbing materials to achieve broadband is It has sufficient thickness, and sometimes this...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/28B32B27/30B32B27/32B32B27/40B32B27/06B32B27/08B32B33/00B32B7/12C08J7/04C09D133/04C09D7/61C08L79/08
CPCB32B27/281B32B27/308B32B27/32B32B27/322B32B27/40B32B27/06B32B27/08B32B33/00B32B7/12C09D133/04C09D7/61C09D7/70B32B2255/10B32B2255/26C08J2379/08C08J2433/04C08J7/0427C08K3/041
Inventor 杨智慧孙新田江晓张久霖秦军峰赵轶伦
Owner BEIJING INST OF ENVIRONMENTAL FEATURES
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