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Wideband wave absorbing material and application thereof

A wave-absorbing material and wide-band technology, applied in the field of wave-absorbing material preparation, can solve the problem of wave-absorbing material narrow bandwidth

Inactive Publication Date: 2011-05-25
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a broadband absorbing material and its application, to solve the problem that the bandwidth of the absorbing material in the prior art is very narrow, and to make up for the deficiency that the prior art cannot adapt to a wider application range

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The porous carbon fiber obtained by blending polyacrylonitrile and polymethyl methacrylate and carbonizing at high temperature has two types of pores, one is larger pores with a diameter of about 5 μm; the other is smaller pores , the pore diameter is less than 1μm, and 80% of the smaller pores have a pore diameter in the range of 0.2-0.5μm; the overall pore volume is 0.54cm 3 / g, the conductivity is 1000S / cm. The porous carbon fiber was added to the epoxy resin base with an additive amount of 8wt% to make a composite material sample of 180mm×180mm and a thickness of 3mm. After testing, the peak value of the reflection loss was -19.8dB, and the corresponding frequency was 10.27GHz , and the reflection loss in the 8.9-12GHz frequency band is lower than -10dB, showing an excellent broadband absorbing effect.

Embodiment 2

[0026] The polyaniline spherical particles obtained by emulsion polymerization form micropores smaller than 1 μm by replacing the emulsifier / dopant sodium dodecylbenzenesulfonate, and at the same time, the polyaniline particles agglomerate and form a cavity network with a size of 0.5-7 μm , the overall pore volume is 0.31cm 3 / g; its conductivity is 10S / cm. The polyaniline was added to the bisphenol A type unsaturated polyester resin base in an amount of 15wt% to make a composite material sample of 180mm×180mm and a thickness of 3mm, and the peak value of the reflection loss was -20.7dB after testing , the corresponding frequency is 9.8GHz, and the reflection loss in the 8.4-11.6GHz frequency band is lower than -10dB, showing an excellent broadband absorbing effect.

[0027] Implementation column 3

[0028] The tubular polypyrrole obtained by template polymerization has a hollow tube diameter between 0.8 and 2.5 μm, and there are a large number of micropores with a size in t...

Embodiment 4

[0030] The porous carbon fiber obtained by blending polyacrylonitrile and polymethyl methacrylate and carbonizing at high temperature has two types of pores, one is larger pores with a diameter of about 5 μm; the other is smaller pores , the pore diameter is less than 1μm, and 80% of the smaller pores have a pore diameter in the range of 0.2-0.5μm; the overall pore volume is 0.54cm 3 / g, the conductivity is 100S / cm. The porous carbon fiber was added to the phenolic resin matrix with an additive amount of 4wt% to make a composite material sample of 180mm×180mm and a thickness of 3mm. After testing, the peak value of the reflection loss was -12.1dB, and the corresponding frequency was 10.18GHz. And the reflection loss in the 9.5-11GHz frequency band is lower than -10dB.

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Abstract

The invention belongs to the field of preparation of wave absorbing materials, and relates to a wideband wave absorbing material and application thereof, in particular to a wideband wave absorbing material prepared from a porous electric loss substance and application thereof. The invention relates to a wideband wave absorbing material prepared from a porous electric loss substance, which is characterized in that (1) the material is a particle of which the particle size is 10-100 mu m; (2) the electric conductivity of the material is 10<-3>-10<3> S / cm; and (3) the material particle is in a porous structure, and the pore volume is 0.1-1 cm<3> / g, wherein the sizes of 10-30% by volume of the pores are 1-10 mu m, and the sizes of the rest pores are less than 1 mu m. 4-20% by mass of the material can be added to a matrix substance to prepare a wave absorbing coating or wave absorbing composite material, and the wave absorbing coating or wave absorbing composite material can absorb electromagnetic waves within the wide wave band range of 2-20 GHz. The invention solves the problem of narrow bandwidth of the wave absorbing material in the prior art, and overcomes the defect that the prior art can not adapt to wider application range.

Description

technical field [0001] The invention belongs to the field of preparation of wave-absorbing materials, and relates to a broadband wave-absorbing material and its application, in particular to a broadband wave-absorbing material made of porous electric loss material and its application. Background technique [0002] Absorbing materials have important applications in electromagnetic radiation protection, electromagnetic shielding, and stealth materials, and are generally made of substances with electrical or magnetic losses. These absorbing substances are often added to coatings or base materials to make absorbing coatings or absorbing composite materials. However, these absorbing devices often have the disadvantage of narrow absorbing frequency bands, even if the reflection loss can reach a very low peak value. , but the -10dB reflection loss bandwidth is very narrow. However, we know that electromagnetic waves such as radar waves have a wide frequency band, and only a very n...

Claims

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Application Information

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IPC IPC(8): C09D5/32C08L67/06C08L63/00C08L61/06C08L23/12C08L23/06C08L67/00C08L77/00C08L71/08C08K7/24C08L79/02C08L79/04
Inventor 杨胜林金俊弘李光谢天时高敬伟江建明
Owner DONGHUA UNIV
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