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Wave-absorbing material based on grapheme and preparation method thereof

A wave absorbing material, graphene technology, applied in chemical instruments and methods, other chemical processes, etc., can solve the problems of long time period, poor high temperature oxidation resistance, high quality of wave absorbing materials, etc., to enhance the ability of dielectric loss, The effect of strong absorbing ability and wide absorbing frequency

Inactive Publication Date: 2016-06-08
兰州天烁新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The graphene used in the above wave-absorbing materials is prepared by chemical methods. Not only the preparation process is complicated and the time period is long, but also strong acids and strong oxidants are used in the preparation process, and a large amount of sewage is produced, which seriously pollutes the environment.
On the other hand, the main wave absorbing agent of the graphene-loaded magnetic medium particle composite material is still a magnetic medium type material, and a small amount of graphene only plays a role in improving the wave absorbing performance of the former, and the wave absorbing material as a whole still has a large mass and a high density. Shortcomings
[0006] It can be seen that there are currently many reports on adding a small amount of nano-carbon materials to magnetic materials and conductive polymers as electromagnetic wave absorbers. Among them, nano-carbon materials mainly include redox graphene prepared by chemical methods, carbon nanotubes, nano Carbon fiber, nano-graphite powder, its disadvantage is that these nano-carbon materials have complex preparation process (nano-carbon fiber), high cost (nano-carbon tube), pollute the environment (redox graphene prepared by chemical method), nano-graphite (poor high temperature oxidation resistance) , smaller specific surface area)

Method used

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  • Wave-absorbing material based on grapheme and preparation method thereof
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  • Wave-absorbing material based on grapheme and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Mix 5g of flake graphite (325 mesh) with 30g of dry ice evenly, put it into a 1L stainless steel tank, and grind it in a planetary ball mill (the rotating speed of the turntable is 350rad / min, and the rotation speed of the steel tank is 700rpm), and the grinding time is 12 hours. Afterwards, graphene powder is obtained. The obtained sample was mixed with paraffin in a certain volume ratio (graphene powder:paraffin=7:3), and ultrasonically dispersed in n-butane system. The above-mentioned mixed samples were made into a ring with an outer diameter of 7mm, an inner diameter of 3.04mm, and a thickness of 3mm in a special mold. The microwave absorption performance of the material was tested with a Jielun E8363B vector network analyzer, and the test frequency range was 2 to 18GHz.

[0039] Measurement results: When the prepared graphene absorbing material has a matching thickness of 2.0mm, it can reach a maximum absorption of -23.34dB at 9.77GHz; when the matching thickness i...

Embodiment 2

[0041] 5g flake graphite (500 mesh) and 30g dry ice were mixed evenly, put into a 1L stainless steel tank, and ground in a planetary ball mill (the rotating speed of the turntable was 350rad / min, and the rotation speed of the steel tank was 700rpm), the grinding time was 8 hours, and cooled Afterwards, graphene powder is obtained. The subsequent preparation and testing methods of the absorbing material are the same as in Example 1.

[0042] Measurement results: When the prepared graphene absorbing material has a matching thickness of 1.92mm, it can reach a maximum absorption of -32.28dB at 8.69GHz; when the matching thickness is 1.0-5.0mm, the effective absorption band with a reflection loss lower than -10dB reaches 1.7GHz.

[0043] Figure 5 It is the graph of the absorbing performance of the graphene absorbing material under different matching thicknesses.

Embodiment 3

[0045] Mix 5g of flake graphite (1000 mesh) with 30g of dry ice, put it into a 1L stainless steel tank, and grind it in a planetary ball mill (the rotating speed of the turntable is 350rad / min, and the rotation speed of the steel tank is 700rpm), and the grinding time is 8 hours. Afterwards, graphene powder is obtained. The subsequent preparation and testing methods of the absorbing material are the same as in Example 1.

[0046] Test results: When the prepared graphene absorbing material has a matching thickness of 1.95mm, it can reach a maximum absorption of -10.57dB at 8.24GHz; when the matching thickness is 1.0-5.0mm, the effective absorption band with a reflection loss lower than -10dB reaches 1.3GHz.

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Abstract

The invention discloses a wave-absorbing material based on grapheme and a preparation method thereof. The wave-absorbing material is formed by mixing graphite powder (or taking graphite powder as a main material) with one of three magnetic dielectric materials: ferrite, carbonyl iron powder and ultrafine metal powder, wherein the graphite powder is prepared by flake graphite through a mechanical stripping method and has a mass percentage content of 60-99 percent. The wave-absorbing material provided by the invention has the characteristics of being high in absorption strength, wide in absorption band, low in density and the like and has the excellent characteristics of the grapheme and the magnetic dielectric materials in electromagnetic performance; the preparation method is easy for large scale, low in cost, environment-friendly and suitable for industrialized production. The wave-absorbing material has wide application potential and market prospect in the fields of wave-absorbing materials, anti-electrostatic materials and electromagnetic shielding.

Description

Technical field: [0001] The invention relates to a method for preparing a graphene-based wave-absorbing material, and belongs to the field of preparing electromagnetic wave-absorbing materials. technical background: [0002] With the development of modern science and technology, from the generation and transmission of electricity, the daily use of household appliances, the operation of industrial equipment to the coverage of telecommunications and broadcasting, human beings are exposed to electromagnetic fields acting in complex ways all the time. Electromagnetic radiation refers to the phenomenon of energy propagating through space in the form of electromagnetic waves. If the electromagnetic radiation intensity exceeds the upper limit that the environment and the human body can bear, it will endanger the ecological environment and human health. Therefore, electromagnetic wave radiation is considered to be the fourth largest pollution source after water pollution, noise pol...

Claims

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Application Information

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IPC IPC(8): C09K3/00
CPCC09K3/00C09K2003/1034C09K2003/1087
Inventor 倪鲲鹏赵永青陶鹏宇袁舒畅
Owner 兰州天烁新能源有限公司
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