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Broadband wave-absorbing composite material and preparation method thereof

A composite material and broadband technology, which is applied in the field of broadband absorbing composite materials and its preparation, can solve the problems such as the inability to finely adjust the gradient effect of layer and layer impedance and the reduction of structural strength. The effect of a good impedance gradient effect

Pending Publication Date: 2022-05-06
SHENZHEN KUANG CHI HIGH END EQUIP TECH DEV LTD
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Problems solved by technology

[0003] The present invention aims to provide a broadband wave-absorbing composite material and its preparation method to solve the problem of inability to finely adjust the gradient effect of impedance between layers and the need for glue between layers in the design of multi-layer wave-absorbing structures in the prior art. The technical problem of reducing the structural strength caused by bonding the layers with adhesives such as films

Method used

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  • Broadband wave-absorbing composite material and preparation method thereof

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preparation example Construction

[0017] According to a typical embodiment of the present invention, a preparation method of a broadband wave-absorbing composite material is provided. The preparation method comprises the following steps: 1) Stir and disperse one or both of carbon nanotubes and MXenes in an aqueous graphene oxide dispersion to obtain a wave absorbing agent slurry; 2) in the wave absorbing agent slurry Add polymer particles of different sizes, and then obtain polymer particles with surface-coated absorbing components through mechanical stirring, filtration, and vacuum drying steps, that is, absorbing particles; 3) According to the requirements of the multi-layer design scheme, different The microwave-absorbing particles with different agent content and / or different sizes are sprinkled in the heat-pressing mold; and 4) closing the heat-pressing mold, and obtaining a broadband wave-absorbing composite material by heat-pressing.

[0018] Applying the technical solution of the present invention, in ...

Embodiment 1

[0026] 1) Preparation of wave absorbing agent slurry: Add carboxylated multi-walled carbon nanotubes with diameters of 8 to 15 nm and lengths of 3 to 5 μm in different numbers of graphene oxide dispersions at 5 mg / ml, mechanically stir and disperse for 30 minutes, and absorb Wave agent slurry. The ratios of graphene oxide and carbon nanotubes in the wave absorbing agent slurry are 1:0.2, 1:0.5, 1:0.7, 1:1, 1:1.5, 1:2, 1:3, respectively;

[0027] 2) Add polystyrene microspheres with a size of 30 μm to the seven ratios of wave-absorbing agent slurry obtained in step 1), and disperse with high-speed mechanical stirring for 120 minutes, so that the wave-absorbing agent is coated on the surface of the polystyrene microspheres.

[0028] 3) Filter out the coated polystyrene microspheres in step 2), and dry them in vacuum at 90 degrees Celsius for 12 hours in a vacuum drying oven to obtain polystyrene microspheres coated with wave-absorbing components on the surface, that is, wave-abs...

Embodiment 2

[0032] 1) Preparation of wave absorbing agent slurry: Add carboxylated multi-walled carbon nanotubes with a diameter of 8-15 nm and a length of 0.5 to 2 μm in a 5 mg / ml graphene oxide dispersion, and mechanically stir and disperse for 30 minutes to obtain a wave absorbing agent slurry material. The ratio of graphene oxide to carbon nanotubes in the dispersion is 1:1.5;

[0033] 2) The seven parts of wave absorbing agent slurry obtained in step 1) were respectively mixed with polystyrene microspheres with sizes of 113 μm, 87 μm, 65 μm, 46 μm, 25 μm, 17 μm, and 8 μm, and dispersed by high-speed mechanical stirring for 120 minutes, so that the wave absorbing agent package onto the surface of polystyrene microspheres.

[0034] 3) Filter out the coated polystyrene microspheres in step 2), and dry them in vacuum at 90 degrees Celsius for 12 hours in a vacuum drying oven to obtain polystyrene microspheres coated with wave-absorbing components on the surface, that is, wave-absorbing co...

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Abstract

The invention discloses a broadband wave-absorbing composite material and a preparation method thereof. The preparation method comprises the following steps: 1) uniformly stirring and dispersing one or two of carbon nanotubes and MXenes in a graphene oxide aqueous dispersion liquid to obtain a wave-absorbing agent slurry; (2) adding high-molecular particles with different sizes into the wave-absorbing agent slurry, and then carrying out mechanical stirring, filtering and vacuum drying to obtain high-molecular particles coated with wave-absorbing components on the surfaces, namely wave-absorbing particles; (3) according to the requirements of a multi-layer design scheme, the wave-absorbing particles with different wave-absorbing agent contents and / or different sizes are sequentially spread in a hot-pressing mold from bottom to top according to the weight and thickness requirements; and 4) closing the mold, and carrying out hot press molding to obtain the broadband wave-absorbing composite material. In the impedance gradual change structure, the thickness of each wave-absorbing structure layer can be subjected to wave-absorbing agent particle laying according to the required thickness, so that finer gradual change of the content of the wave-absorbing agent can be realized, a better impedance gradual change effect is achieved, and broadband impedance matching is facilitated.

Description

technical field [0001] The invention relates to the technical field of wave-absorbing materials, in particular to a broadband wave-absorbing composite material and a preparation method thereof. Background technique [0002] Absorbing material is an important material that can achieve low radar reflection cross-sectional area of ​​the target object, and is widely used in military aircraft, ships and other equipment. In order to achieve absorbing performance with both wide absorbing bandwidth and low reflection loss, researchers usually design the absorbing material as a multilayer structure with gradual impedance to expand the absorbing bandwidth and reduce reflection loss, such as multilayer impedance gradient absorbing honeycomb , absorbing foam, laminated board, etc. This multi-layer design generally requires adhesives such as film to bond each layer to improve the structural strength of the absorbing material. In order to improve the absorbing performance, it is general...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q17/00H05K9/00C08K3/04C08L25/06C08L23/06
CPCH01Q17/00H05K9/0088C08K3/042C08K3/041C08K2201/011C08L25/06C08L23/06
Inventor 刘若鹏赵治亚陈宏辉邢明军黄金国
Owner SHENZHEN KUANG CHI HIGH END EQUIP TECH DEV LTD
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