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Gradient type microporous broadband wave-absorbing material and supercritical limited foaming type preparation method thereof

A wave absorbing material and a gradient type technology are applied in the field of gradient type microporous broadband wave absorbing material and its supercritical restricted foaming type preparation, which can solve the problems of narrow wave absorbing frequency band, high wave absorbing material density and high cost. To achieve the effect of improving mechanical properties, good control flexibility, and increasing nucleation density

Active Publication Date: 2020-11-20
WUHAN TEXTILE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to achieve broadband microwave absorption performance at low thickness, the addition ratio of microwave-absorbing particles is high, and the density of microwave-absorbing materials is high, which easily leads to poor physical and chemical properties
Therefore, there are still problems in the development of microwave-absorbing materials such as narrow microwave-absorbing frequency band, high cost, and difficult size control, which limit the scope of application and commercialization.
There are still difficulties and challenges in how to precisely design and control the internal structure of absorbing materials, and then obtain composite absorbing materials with broadband absorbing, light weight, macroscopic size controllability and high performance.

Method used

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  • Gradient type microporous broadband wave-absorbing material and supercritical limited foaming type preparation method thereof
  • Gradient type microporous broadband wave-absorbing material and supercritical limited foaming type preparation method thereof
  • Gradient type microporous broadband wave-absorbing material and supercritical limited foaming type preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A gradient type microporous broadband wave-absorbing material, the preparation method of which comprises the following steps:

[0037] S1. Prefabricated sheet: Mix nanoporous carbon fiber, polymethylmethacrylate and nanoclay according to the preset mass ratio of 1:98:1, 3:95:2 and 5:92:3 respectively, and extrude through twin-screw extruder (extruder temperature: 190-220°C, rotating speed: 85r / min) for blending, granulation, drying, and injection molding to obtain three groups of prefabricated sheets with a thickness of 0.5mm in different mass ratios. Heterogeneous nucleation can be induced by adding nanoclay nucleating agent, further improving the foaming performance of the gradient microporous broadband absorbing material, and the nano-size effect of the nano-viscosity dispersed in the substrate helps to improve the absorbing material. absorption rate.

[0038] Wherein, the nanoporous carbon fiber is prepared through the following steps:

[0039] First, the mass rat...

Embodiment 2

[0048] A gradient-type microporous broadband wave-absorbing material, compared with Example 1, the difference is that step S1 includes: prefabricated sheet: nanoporous carbon fiber, polymethyl methacrylate and nanoclay respectively by preset mass Mixing at a ratio of 2:97:1, 5:93:2 and 8:88:4, blending and granulation through a twin-screw extruder (extruder temperature: 190-220°C, speed: 85r / min) , and after drying, three groups of prefabricated sheets with a thickness of 0.5 mm in different mass ratios were obtained by injection molding. Others are substantially the same as in Embodiment 1, and will not be repeated here.

Embodiment 3

[0050] A gradient-type microporous broadband wave-absorbing material, compared with Example 1, the difference is that step S1 includes: prefabricated sheet: nanoporous carbon fiber, polymethyl methacrylate and nanoclay respectively by preset mass Mixing at a ratio of 1:98:1, 3:95:2 and 5:92:3, blending and granulation through a twin-screw extruder (extruder temperature: 190-220°C, speed: 85r / min) , after drying, three groups of prefabricated sheets with a thickness of 1 mm in different mass ratios were obtained by injection molding. Others are substantially the same as in Embodiment 1, and will not be repeated here.

[0051] As described in Examples 1 to 3, by adjusting the thickness of the prefabricated sheet, the content of the absorbing medium and the nucleating agent, microporous structures with different structural parameters can be obtained, thereby realizing multi-layer broadband absorbing in different frequency bands, so The wave-absorbing frequency band has good cont...

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Abstract

The invention provides a gradient type microporous broadband wave-absorbing material and a supercritical limited foaming type preparation method thereof. The gradient type microporous broadband wave-absorbing material comprises at least two layers of microporous wave-absorbing materials which are stacked, wherein the microporous wave-absorbing material is prepared from a wave-absorbing medium, a polymer base material and a nucleating agent through compression molding and supercritical carbon dioxide integrated limited foaming. According to the invention, a wave-absorbing medium, a polymer basematerial and a nucleating agent are compounded through supercritical carbon dioxide integrated limited foaming to prepare a gradient type microporous broadband wave-absorbing material, multi-band broadband absorption can be achieved by utilizing the structure and the wave-absorbing performance of the wave-absorbing medium and the synergistic effect formed by the wave-absorbing medium and the gradient type microporous structure, and the gradient type microporous broadband wave-absorbing material has the characteristics of simple preparation method, low cost, wide wave-absorbing frequency bandand good wave-absorbing frequency band regulation and control flexibility.

Description

technical field [0001] The invention belongs to the technical field of preparation of wave-absorbing materials, and in particular relates to a gradient-type microporous broadband wave-absorbing material and a supercritical limited foaming preparation method thereof. Background technique [0002] With the rapid development of the electronic communication industry, a large number of emerging electronic and electrical equipment has poured into every corner of life such as transportation, communication, and household appliances, providing great convenience for human life. However, they also produce electromagnetic radiation of different frequencies, which brings inconvenience to people's production and life. Especially with the advent of the 5G era, the wavelength of electromagnetic waves for communication transmission has also come to millimeter waves, and the number of 5G base stations and 5G communication equipment will increase several times. The advanced communication tech...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L33/12C08L75/04C08K7/24C08K3/34C08K7/06C08J9/12B32B27/08B32B37/10B32B27/18B32B27/40B32B27/32B32B27/30H05K9/00
CPCC08J9/122C08J9/0076C08J9/0071C08J9/0095C08J9/0085B32B27/08B32B37/10B32B27/18B32B27/40B32B27/32B32B27/30H05K9/0088H05K9/009C08J2333/12C08K7/24C08K2201/011C08K3/346C08K3/34C08K7/06C08J2203/06C08J2203/08C08J2375/04
Inventor 杨晨光王栋武艺周鹏程李颖颖
Owner WUHAN TEXTILE UNIV
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