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Flexible low-frequency wave-absorbing plate and preparation method thereof

A flexible, low-frequency technology, applied in the field of flexible low-frequency wave-absorbing sheets and its preparation, can solve the problems of unsuitable promotion and application, high cost, narrow absorption bandwidth, etc., and achieve industrial application, high production efficiency, and strong applicability Effect

Active Publication Date: 2020-12-11
HUNAN INSTITUTE OF ENGINEERING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The microwave absorbing agent powder filled with microwave low-frequency absorbing film includes spherical magnetic metal powder and flake magnetic metal powder. Low-frequency wave absorbing film filled with spherical carbonyl ferromagnetic metal powder has a wide effective absorption bandwidth, but it needs to be filled with more than 90 wt.% Magnetic powder, resulting in thickness (>2.0mm) and surface density (>5.0kg / m 2 ) are large, costly, and have reduced flexibility and mechanical properties, which are not suitable for popularization and application; low-frequency wave-absorbing plates filled with flake-like sendust magnetic metal powder have small thickness and surface density, but they are easy to reflect electromagnetic waves and cause effective Narrow absorption bandwidth and poor electromagnetic properties make it difficult to meet the needs of practical applications

Method used

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  • Flexible low-frequency wave-absorbing plate and preparation method thereof
  • Flexible low-frequency wave-absorbing plate and preparation method thereof
  • Flexible low-frequency wave-absorbing plate and preparation method thereof

Examples

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Effect test

Embodiment 1

[0029] In the flexible low-frequency wave-absorbing sheet of this embodiment, the rubber is polyurethane elastomer, and the functional additives filled include flame retardant, wetting and dispersing agent, vulcanizing agent and plasticizer. The first and third layers of rubber films are filled with D50= 3.27μm spherical nickel carbonyl magnetic powder with a thickness of 0.3mm, the second and fourth layers of rubber film are filled with two-dimensional flake FeCoZr magnetic powder with D50=126.81μm and the thickness is 0.2mm, the total thickness of the flexible low-frequency wave absorbing sheet is 1.0mm.

[0030] The preparation method of the flexible low-frequency wave-absorbing sheet comprises the following steps:

[0031] (1) Mix 0.5kg polyurethane rubber particles, 0.1kg flame retardant, 0.02kg wetting and dispersing agent, 0.02kg

[0032] Vulcanizing agent, 0.01kg plasticizer and 3.0kg are evenly divided into two parts, one part is added with spherical nickel carbonyl ...

Embodiment 2

[0043] In this embodiment, the rubber is nitrile rubber elastomer, and the functional additives filled include flame retardant, wetting and dispersing agent, leveling agent and vulcanizing agent. μm and 2.39μm spherical FeCo magnetic powder and FeNi magnetic powder and the thickness of both layers is 0.35mm, the second and fourth layers of rubber film are filled with flake FeNiMo magnetic powder and flake FeSiCr magnetic powder with D50 of 118.34μm and 109.26μm respectively and two layers The thickness is 0.3mm, and the total thickness of the flexible low-frequency wave-absorbing sheet is 1.3mm.

[0044] The preparation method of the above-mentioned flexible low-frequency wave-absorbing sheet comprises the following steps:

[0045] (1) Divide 0.7kg of nitrile rubber particles, 0.15kg of flame retardant, 0.02kg of wetting and dispersing agent, 0.01kg of leveling agent and 0.03kg of vulcanizing agent into two, and add 1.5kg of spherical FeCo magnetic powder, 1.0 kg spherical Fe...

Embodiment 3

[0052] In this embodiment, the rubber is EPDM elastomer, and the functional additives and powders filled include flame retardant, wetting and dispersing agent, leveling agent and vulcanizing agent, and the first and third layers of rubber films are filled with Spherical nickel carbonyl powder with particle size D50 of 4.02μm and both layers of thickness are 0.5mm, the second and fourth layers of rubber film are filled with flaky FeSi with D50 of 97.68μm and both layers of thickness are 0.25mm, flexible low frequency absorbing sheet The total thickness is 1.5mm.

[0053] The preparation method of the above-mentioned flexible low-frequency wave-absorbing sheet comprises the following steps:

[0054] (1) Divide 0.6kg of nitrile rubber granules, 0.15kg of flame retardant, 0.03kg of wetting and dispersing agent, 0.01kg of leveling agent and 0.03kg of vulcanizing agent into two, and add 2.5kg of spherical nickel carbonyl powder to one part, Add 1.0 kg of two-dimensional flake FeSi ...

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Abstract

The invention relates to a flexible low-frequency wave-absorbing plate and a preparation method thereof. The wave-absorbing plate is formed by superposing and hot-pressing four layers of flexible rubber films, wherein each layer of rubber film is filled with various same functional assistants, powder and different electromagnetic wave absorbents. According tot he wave-absorbing plate, from outsideto inside, the first layer of rubber film and the third layer of rubber film are filled with micro-nano spherical magnetic metal particles, and the good impedance matching characteristic and the goodelectromagnetic wave attenuation characteristic are achieved at the same time; and the second layer and the fourth layer are filled with micron-sized two-dimensional flaky magnetic metal powder and have strong electromagnetic wave attenuation characteristics. The invention further comprises a preparation method of the flexible low-frequency wave-absorbing plate. The low-frequency wave-absorbing plate provided by the invention not only has broadband strong absorption performance in a microwave low-frequency band, but also has the advantages of being thin in thickness, low in surface density, resistant to high and low temperature, high in flame-retardant grade, green and environment-friendly, and capable of being attached to the surface of a target in any shape, and has a good application prospect in the fields of military radar stealth technology and electromagnetic compatibility of civil electronic products.

Description

technical field [0001] The invention relates to a wave-absorbing material, in particular to a flexible low-frequency wave-absorbing sheet and a preparation method thereof. Background technique [0002] With the development of wireless microwave communication technology represented by 5G communication, the number of industrial electronic equipment and household electronic products is increasing day by day, and they are developing towards diversified functions, miniaturization, and concentrated working frequency in the GHz band. In addition, the radar detection technology is improving day by day. In order to increase the detection distance, the working frequency of the detection radar is developed to the microwave low frequency band (L, S, C band), which is invisible to the radar. The comprehensive performance of absorbing materials puts forward higher requirements. In order to solve the problem of electromagnetic interference and improve radar stealth performance, it is more...

Claims

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Application Information

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IPC IPC(8): B32B25/02B32B25/04B32B33/00B29C43/20B29L7/00C08L75/04C08K7/18C08K7/00C08L9/02C08L23/16C08J5/18
CPCB32B25/042B32B25/02B32B33/00B29C43/203C08J5/18B32B2307/212B32B2250/24B29L2007/00C08J2375/04C08J2309/02C08J2323/16C08K7/18C08K7/00C08K2201/01C08K2201/005
Inventor 贺君颜铄清邓永和刘胜
Owner HUNAN INSTITUTE OF ENGINEERING
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