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Absorbing agent and preparation method thereof

The technology of a wave absorbing agent and expanded graphite is applied in the field of wave absorbing materials, which can solve the problems of complex preparation process, narrow wave absorption frequency band and low absorption rate of wave absorbing materials, and achieves simple preparation technology, simple preparation method and strong absorption capacity. Effect

Inactive Publication Date: 2019-06-04
LUOYANG INST OF CUTTING EDGE TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high density, low absorption rate, and poor temperature stability of the traditional ferrite tetroxide, and the low magnetic permeability and permittivity in the microwave segment, a single ferrite material cannot absorb waves at the same time. Material "thin, light, wide, strong" requirements
[0004] In order to solve the problems of high density and poor wave-absorbing performance of ferroferric oxide, a method for preparing composite materials has appeared in the prior art, by refluxing carbon nanotubes in concentrated nitric acid, introducing carbonyl groups and hydroxyl groups on the surface , carboxyl and other functional groups, the prepared nanocomposite materials have good application prospects in the fields of high-density magnetic recording materials, wave-absorbing materials, electromagnetic shielding materials, medicine, etc. However, the cost of carbon nanotubes is high, the preparation process is very complicated, and its The distribution in the matrix is ​​random, the designability is poor, and the absorbing frequency band of the prepared absorbing material is narrow

Method used

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  • Absorbing agent and preparation method thereof
  • Absorbing agent and preparation method thereof

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preparation example Construction

[0023] The invention provides a wave absorbing agent and a preparation method thereof, the method comprising the following steps:

[0024] Dissolve 30-70 parts of graphite in 5-10 parts of concentrated sulfuric acid (concentrated sulfuric acid with a mass fraction greater than 70%) to form a concentrated sulfuric acid solution of graphite; then add the concentrated sulfuric acid solution of graphite to 80-120 parts of deionized water, then mechanically stirred in a water bath at 50-60°C for 40-60min, then washed 3-5 times with water, filtered with filter paper with a pore size of 30-50μm, dried at 60-80°C for 10-12h, and then the obtained Graphite is placed in a muffle furnace that has been heated to 800-1000 ° C for 5-10 minutes, and then cooled to prepare expanded graphite;

[0025] Stir and mix 5-8 parts of ammonia water and 10-20 parts of ethanolamine evenly, then add 200-300 parts of soluble iron salt (one or more of ferric chloride, ferric nitrate and ferric sulfate), an...

Embodiment 1

[0028] Dissolve 50 parts of graphite in 8 parts of 98% concentrated sulfuric acid to form a concentrated sulfuric acid solution of graphite; then add the concentrated sulfuric acid solution of graphite to 90 parts of deionized water, and then mechanically stir in a water bath at 55°C for 50 minutes , followed by washing with water for 4 times, then filtering and drying, and then putting the obtained graphite into a muffle furnace heated to 900°C for 8 minutes, and then cooling to prepare expanded graphite;

[0029] Stir and mix 6 parts of ammonia water and 15 parts of ethanolamine, then add 220 parts of ferric chloride, stir and mix evenly, and then react in a reactor at 220°C for 7 hours to obtain a mixed solution, which is poured into In the reaction vessel beaker;

[0030] Add 16 parts of expanded graphite to 45 parts of the mixed solution, adjust the pH to 10.5-11.5, mechanically stir in an oil bath at 100°C for 10 hours, absorb the magnetic substance to the bottom of the ...

Embodiment 2

[0032] Dissolve 60 parts of graphite in 9 parts of 98% concentrated sulfuric acid to form a concentrated sulfuric acid solution of graphite; then add the concentrated sulfuric acid solution of graphite to 100 parts of deionized water, and then mechanically stir in a water bath at 60°C for 50 minutes , followed by washing with water three times, filtering and drying, and then putting the obtained graphite into a muffle furnace heated to 950°C for 6 minutes, and then cooling to prepare expanded graphite;

[0033] Stir and mix 6 parts of ammonia water and 12 parts of ethanolamine, then add 260 parts of ferric nitrate, stir and mix evenly, and then react in a reactor at 250°C for 8 hours to obtain a mixed solution, which is poured into In the reaction vessel beaker;

[0034] Add 18 parts of expanded graphite to 46 parts of the mixed solution, adjust the pH to 10.5-11.5, mechanically stir in an oil bath at 110°C for 11 hours, absorb the magnetic substance to the bottom of the beake...

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Abstract

The invention provides an absorbing agent and a preparation method thereof. The method comprises the following steps: mixing ammonia water and ethanolamine, adding iron salt, reacting to obtain a mixed liquid; and adding expanded graphite to the mixed liquid, adjusting pH, stirring at the temperature T, washing, and drying to obtain the absorbing agent formed by coating hollow ferriferrous oxide with expanded graphite. The absorbing agent prepared by the method has advantages of low density, wide absorbing band and good absorbing performance, and can be applied in the fields of aerospace, electrocommunication, medical apparatus and instruments and the like.

Description

technical field [0001] The present invention relates to a wave absorbing material, in particular to a wave absorbing agent and a preparation method thereof. Background technique [0002] With the wide application of electromagnetic waves in the field of wireless communication, problems such as electromagnetic interference and information leakage need to be solved urgently. The electromagnetic stealth technology in the military field and the microwave guidance requirements of missiles make microwave absorbing materials receive continuous and extensive attention. Therefore, it is urgent to develop a kind of absorbing material with thin thickness, light weight, wide frequency band and strong absorption. [0003] At present, because of its advantages of high magnetic permeability, low toxicity, low cost and easy availability, ferric oxide is considered to be the most likely ideal absorbing material in the gigahertz range. However, due to the high density, low absorption rate, ...

Claims

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Application Information

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IPC IPC(8): C09K3/00
CPCC01G49/08C09K3/00H01F1/01
Inventor 不公告发明人
Owner LUOYANG INST OF CUTTING EDGE TECH
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