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A kind of flexible low frequency wave absorbing sheet and preparation method thereof

A wave-absorbing sheet and flexible technology, applied in the field of wave-absorbing materials, can solve problems such as unsuitable promotion and application, high cost, and narrow absorption bandwidth, and achieve the effects of industrial application, high production efficiency, and strong applicability

Active Publication Date: 2022-07-19
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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  • A kind of flexible low frequency wave absorbing sheet and preparation method thereof
  • A kind of flexible low frequency wave absorbing sheet and preparation method thereof
  • A kind of flexible low frequency wave absorbing sheet and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] In the flexible low-frequency wave absorbing sheet of this embodiment, the rubber is a polyurethane elastomer, and the filled functional additives include flame retardants, wetting and dispersing agents, vulcanizing agents and plasticizers, and the first and third layers of rubber films are filled with D50= The 3.27μm spherical nickel carbonyl magnetic powder and the thickness are both 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, and 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 includes the following steps:

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

[0032] The vulcanizing agent, 0.01kg plasticizer and 3.0kg are evenly divided into two parts. One part is added wit...

Embodiment 2

[0043] In this embodiment, the rubber is a nitrile rubber elastomer, and the filled functional additives include flame retardants, wetting and dispersing agents, leveling agents and vulcanizing agents. The first and third layers of rubber films are filled with particle size D50 of 2.78 respectively. The spherical FeCo magnetic powder and FeNi magnetic powder of μm and 2.39 μm are 0.35mm thick, and the second and fourth rubber films are filled with flake FeNiMo magnetic powder and flake FeSiCr magnetic powder with D50 of 118.34 μm and 109.26 μm, respectively. The thickness is 0.3mm, and the total thickness of the flexible low-frequency wave absorber 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, one o...

Embodiment 3

[0052] In this embodiment, the rubber is an EPDM elastomer, and the filled functional additives and powders include flame retardants, wetting and dispersing agents, leveling agents and vulcanizing agents. The first and third layers of rubber films are filled with Spherical nickel carbonyl powder with particle size D50 of 4.02μm and two layers of thickness 0.5mm, the second and fourth layers of rubber film filled with flake FeSi with D50 of 97.68μm and two layers of thickness of 0.25mm, flexible low-frequency wave 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 particles, 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 parts, and add 2.5kg of spherical nickel carbonyl powder to one of them. 1.0kg of two-dimensional flake FeS...

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Abstract

A flexible low-frequency wave absorbing sheet and a preparation method thereof. The wave absorbing sheet is formed by superimposing and hot pressing four layers of flexible rubber films, and each layer of the rubber film is filled with the same various functional additives, powders and different electromagnetic wave absorption. agent. From the outside to the inside of the absorber, the first and third layers of rubber film are filled with micro-nano spherical magnetic metal particles, which have both good impedance matching characteristics and electromagnetic wave attenuation characteristics; the second and fourth layers are filled with micron-sized two-dimensional sheets. Magnetic metal powder with strong electromagnetic wave attenuation characteristics. The present invention also includes a preparation method of the flexible low-frequency wave absorbing sheet. The low-frequency wave absorbing sheet of the present invention not only has broadband and strong absorption performance in the low frequency of microwave, but also has the advantages of thin thickness, low areal density, high and low temperature resistance, high flame retardant grade, green environmental protection, and can be attached to any shape target surface. , has a good application prospect in the field 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, and the functions are diversified, the size is miniaturized, and the operating frequency is concentrated in the GHz frequency 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, and C bands), and the radar is invisible. The comprehensive performance of absorbing materials puts forward higher requirements. In order to solve the problem of electromagnetic interference and improve the stealth performance of radar, absorb...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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