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Broadband multi-layer structured wave absorbing composite material and preparation thereof

A multi-layer structure and composite material technology, which is applied to composite materials containing carbonyl iron powder and carbon nanotubes in the absorption layer, broadband multi-layer structure wave-absorbing composite materials and their preparation, glass fiber cloth as polymer matrix reinforcement and In the field of preparation, it can solve the problems of poor mechanical strength and insufficient absorption frequency band, and achieve the effects of low areal density, excellent electrical loss, improved bearing performance and engineering application value.

Inactive Publication Date: 2009-05-20
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above-mentioned reports are all about absorbing materials in the middle and high frequency bands of 8-18GHz, and all of them have the disadvantages of not having a wide enough absorption frequency band and poor mechanical strength.

Method used

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  • Broadband multi-layer structured wave absorbing composite material and preparation thereof

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Comparison scheme
Effect test

Embodiment 1

[0030] Add 40% of flake carbonyl iron powder with an average particle size of 3 μm, and 36% of epoxy resin into a high-speed mixer. After fully mixing, evenly coat 24% of the surface of two layers of S glass fiber cloth as a surface layer material. Add 5% of multi-walled carbon nanotubes with an outer diameter of 10 to 60 nm and a length of 1 to 300 μm, and 57% of epoxy resin into a high-speed mixer, and after thorough mixing, evenly coat on two layers of S glass fiber cloth 38 % surface, as sandwich layer material. Add 61% of flake carbonyl iron powder with an average particle size of 3 μm and 23.4% of epoxy resin into a high-speed mixer, mix thoroughly, and evenly coat the surface of 15.6% of four-layer S glass fiber cloth as the bottom material. Superimpose each layer of glass fiber cloth in the order of surface layer, sandwich layer, and bottom layer. After pressing and forming, cut out a flat material with a length, width, and height of 180mm×180mm×4mm.

[0031] Such as ...

Embodiment 2

[0034]Add 40% of spherical carbonyl iron powder with an average particle size of 4 μm, and 36% of bismaleimide resin into a high-speed mixer. After mixing thoroughly, evenly coat 24% of the surface of four-layer S glass fiber cloth as a surface layer material. Add 5% of multi-walled carbon nanotubes with an outer diameter of 3 to 25nm and a length of 5 to 400μm, and 57% of bismaleimide resin into a high-speed mixer, and after fully mixing, evenly coat on two layers of S 38% of the surface of glass fiber cloth, as a sandwich layer material. Add 61% of spherical carbonyl iron powder with an average particle size of 4 μm, and 23.4% of bismaleimide resin into a high-speed mixer. After mixing thoroughly, evenly coat the surface of two layers of S glass fiber cloth with 15.6% as the bottom layer Material. Superimpose each layer of glass fiber cloth in the order of surface layer, sandwich layer, and bottom layer. After pressing and forming, cut out a flat material with a length, wi...

Embodiment 3

[0036] Add 30% of spherical carbonyl iron powder with an average particle size of 3.5 μm, and 42% of cyanate resin into a high-speed mixer. After fully mixing, evenly coat 28% of the surface of four-layer E glass fiber cloth as a surface layer material . Add 3% of single-walled carbon nanotubes with an outer diameter of 10-30nm and a length of 1-200μm, and 58.2% of cyanate resin into a high-speed mixer. After fully mixing, evenly coat on two layers of E glass fiber cloth 38.8% surface, as a sandwich layer material. Add 50% of spherical carbonyl iron powder with an average particle size of 3.5 μm, and 30% of cyanate resin into a high-speed mixer. After mixing thoroughly, evenly coat 20% of the surface of two layers of E glass fiber cloth as the bottom material. Superimpose each layer of glass fiber cloth in the order of surface layer, sandwich layer, and bottom layer. After pressing and forming, cut out a flat material with a length, width, and height of 180mm×180mm×4mm. This...

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Abstract

The invention relates to a broadband wave absorption composite material with a multilayer structure and a preparation method thereof. The broadband wave absorption composite material is characterized in that the material comprises three parts, namely a surface layer, a sandwich layer and a bottom layer; the surface layer comprises, by mass percentage, 20 to 50 percent of carbonyl iron dust, 30 to 48 percent of polymer and 20 to 32 percent of fiberglass cloth; the sandwich layer comprises, by mass percentage, 2 to 6 percent of carbon nanometer tube, 56.4 to 58.8 percent of polymer and 37.6 to 39.2 percent of fiberglass cloth; and the bottom layer comprises, by mass percentage, 50 to 80 percent of carbonyl iron dust, 12 to 30 percent of polymer and 8 to 20 percent of fiberglass cloth. The broadband wave absorption composite material has the advantages of low surface density, thin thickness and high mechanical strength, and improves the bearing performance and the engineering application value.

Description

technical field [0001] The present invention relates to a broadband multi-layer structure microwave-absorbing composite material and its preparation method, in particular to a composite material containing carbonyl iron powder and carbon nanotubes in the absorbing layer and its use of glass fiber cloth as a polymer-based reinforcement and its preparation method. The invention belongs to the technical field of microwave absorbing materials. Background technique [0002] A microwave absorbing material is a functional material that can absorb incident electromagnetic waves and effectively lose the energy of incident electromagnetic waves through various electromagnetic loss mechanisms. With the rapid development of information technology, electromagnetic pollution is becoming more and more serious, and electromagnetic radiation is flooding people's living space. The use of absorbing materials can reduce the interference of electromagnetic waves on test signals and protect the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B17/04B32B27/20B32B27/38B32B37/10B32B38/00C08L63/00C08L79/08C08L79/04C08L61/06C08L23/12C08L71/08C08K3/18C08K7/14C08K7/06
Inventor 朱红张拦申闫春
Owner BEIJING UNIV OF CHEM TECH
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