Electromagnetic wave absorber as well as preparation method and application thereof

A wave-absorbing agent and organic solvent technology, applied in the field of materials, can solve problems such as poor wave-absorbing ability and narrow wave-absorbing bandwidth, and achieve the effect of improving wave-absorbing performance, wave-absorbing frequency bandwidth, and good wave-absorbing ability

Active Publication Date: 2015-06-03
KUANG CHI INST OF ADVANCED TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] Aiming at the problems in the prior art that the carbonyl iron powder has poor microwave absorption ability and narrow microwave absorption bandwidth, one aspect of the present invention proposes a method for preparing a microwave absorbing agent, including:

Method used

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  • Electromagnetic wave absorber as well as preparation method and application thereof

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preparation example Construction

[0075] Preparation method of absorbing material

[0076] Such as figure 1 As shown in step S101, the carbonyl iron powder is oxidized. Mix hydrogen peroxide and organic solvent to form a mixed solution, and mix carbonyl iron powder into it. Ultrasonic treatment is performed on the mixed solution mixed with the carbonyl iron powder so that the carbonyl iron powder can be fully contacted with hydrogen peroxide and oxidized. In some embodiments, the volume ratio of the hydrogen peroxide to the organic solvent is between about 1:19 and about 2:3, and wherein the organic solvent is ethanol. According to some embodiments, the sonication is performed at a power of 900 watts and the treatment time is 120 minutes. After ultrasonic treatment, the oxidized carbonyl iron powder was taken out from the mixed solution, cleaned with ethanol, and the carbonyl iron powder was dried. During the ultrasonic treatment, the ultrasonic power, the volume ratio of hydrogen peroxide to the organic s...

Embodiment 1

[0082] Mix 5ml of hydrogen peroxide with 95ml of ethanol, and add 2g of carbonyl iron powder into it. The above mixed solution was then sonicated at a power of 900 watts for 120 minutes. After ultrasonic treatment, the oxidized carbonyl iron powder was taken out from the mixed solution, washed with ethanol, and the oxidized carbonyl iron powder was dried.

[0083] Put 2.6g of oxidized carbonyl iron powder into a ball milling tank, the weight ratio of pellets to oxidized carbonyl iron powder is 25:1, and the ball milling solution is anhydrous ethylene. At a rotating speed of 500r / min, the ball milling process was implemented for 8 hours.

[0084] Put 2g of ball-milled carbonyl iron powder into 100ml of sodium hydroxide solution with pH=11, and then ultrasonicate for 20 minutes at a power of 180 watts. Take out the surface-treated carbonyl iron powder, wash it in absolute ethanol for 3-5 times, and dry it at room temperature.

[0085] Dissolve 5ml tetrabutyl titanate (TBT) in...

Embodiment 2

[0088] Mix 40ml of hydrogen peroxide with 60ml of ethanol, and add 5g of carbonyl iron powder into it. The above mixed solution was then sonicated at a power of 900 watts for 120 minutes. After ultrasonic treatment, the oxidized carbonyl iron powder was taken out from the mixed solution, washed with ethanol, and the oxidized carbonyl iron powder was dried.

[0089] Put 5g of oxidized carbonyl iron powder into a ball milling tank, the weight ratio of pellets to oxidized carbonyl iron powder is 20:1, and the ball milling solution is anhydrous ethylene. At a rotating speed of 300r / min, the ball milling process was implemented for 9 hours.

[0090] Put 2g of ball-milled carbonyl iron powder into 100ml of sodium hydroxide solution with pH=10, and then ultrasonicate for 10 minutes at a power of 180 watts. Take out the surface-treated carbonyl iron powder, wash it in absolute ethanol for 3-5 times, and dry it at room temperature.

[0091] Dissolve 5ml tetrabutyl orthotitanate (TBT...

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Abstract

The invention provides a method of preparing an electromagnetic wave absorber. The method comprises the following steps: carrying out a ball milling technology carbonyl iron powder; carrying out surface treatment on the ball-milled carbonyl iron powder by using strong base; treating the carbonyl iron powder by virtue of a titanium-containing compound to obtain carbonyl iron-TiO2 core-shell-structured microparticles; and magnetizing the carbonyl iron-TiO2 core-shell-structured microparticles. The electromagnetic wave absorber is prepared from the following components in percentage by weight: 10-60 percent of modified carbonyl iron powder and 40-90 percent of a coating material. The electromagnetic wave absorber prepared by virtue of the method is capable of effectively showing good electromagnetic wave absorption capability in multiple frequency bands; compared with the prior art, the electromagnetic wave absorber is wide in electromagnetic wave absorption frequency band.

Description

technical field [0001] The invention relates to the field of materials, in particular to a wave absorbing agent, a preparation method and an application thereof. . Background technique [0002] In today's rapidly developing society, due to the widespread application of various electronic devices, a large number of electromagnetic waves have been generated in our living environment, causing electromagnetic pollution in the space. These electromagnetic waves not only interfere with each other, but are also harmful to the human body. Therefore Microwave absorbing materials have entered the field of people's livelihood from military applications. With the continuous development of microwave absorbing materials, magnetic Among the materials, it has the advantages of the highest magnetization, high microwave permeability, and high dielectric constant, so it is widely used in the field of microwave-absorbing materials. [0003] The information society requires fast transmission s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K3/00
Inventor 不公告发明人
Owner KUANG CHI INST OF ADVANCED TECH
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