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Microwave absorbing material and preparation method thereof

A wave-absorbing material and composite material technology, applied in the field of wave-absorbing materials, can solve problems such as unsatisfactory, nanopore disappearance, network collapse, etc., to improve mechanical properties and heat resistance, prevent oxidation and agglomeration, and facilitate processing and molding Effect

Active Publication Date: 2014-12-31
KUANG CHI INST OF ADVANCED TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

FR-4 materials are heavy and cannot meet the "lightweight" needs in many environments
For ferroferric oxide aerogel, if it is directly used as a wave-absorbing material, the wave-absorbing effect is not good; if the ferroferric oxide aerogel is directly reduced to nano-iron, with the loss of oxygen during the reduction process, The network will collapse, the nanopores will disappear, and the remaining iron is also prone to agglomeration due to its own magnetic field, so it is impossible to realize the nanometerization of iron and the lightening of the entire absorbing material

Method used

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  • Microwave absorbing material and preparation method thereof
  • Microwave absorbing material and preparation method thereof
  • Microwave absorbing material and preparation method thereof

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preparation example Construction

[0063] Other embodiments of the present invention relate to a method for preparing a wave-absorbing material, the method comprising the following steps:

[0064] Step a. Adsorbing the magnetic metal onto the surface of the airgel to obtain a composite material powder;

[0065] Step b. adding thermoplastic resin to the composite material powder to form a composite material containing thermoplastic resin;

[0066] Wherein the volume percentage of the thermoplastic resin is 5-90%, the volume percentage of the airgel is 0.1-90%, and the volume percentage of the magnetic metal is 0.1-50%.

[0067] Such as figure 1 As shown, in some embodiments, step a includes: adding the magnetic metal source to the sol formed by the airgel source, or adding the airgel source to the solution containing the magnetic metal source, so that the magnetic metal is adsorbed to the Airgel surface.

[0068] In some preferred embodiments, in step a, use tetraethyl orthosilicate or water glass or silica s...

example 1

[0082]a. Using ethyl orthosilicate as the silicon source, take 104 grams of ethyl orthosilicate, 31.5 grams of water, 46 to 460 grams of ethanol, and 31 to 310 grams of ethylene glycol, mix well, and the molar ratio is equivalent to that of ethyl orthosilicate Ester: water: ethanol is 1:3.5:4~20, obtains silica sol; Add the ammonia water that concentration is 0.35mol / L dropwise, adjust pH value to 2.5~3.5, stand still, obtain silica gel, Aging; then use the method of supercritical drying, put the composite wet gel in a high-temperature and high-pressure reactor, evacuate it with argon, adjust the argon pressure at 12MPa, control the temperature at 150°C, supercritical reaction for 10h, and argon protection The atmosphere dropped to room temperature, took it out, and obtained a density of 0.13g / cm 3 , the specific surface area is 860m 2 / g of silica airgel powder.

[0083] b. Get 15.6g of nano-carbonyl iron powder and place it in 500ml of ethanol-acetone solution, add 0.26g o...

example 2

[0087] a. Using ethyl orthosilicate as the silicon source, take 104 grams of ethyl orthosilicate, 31.5 grams of water, 92 to 460 grams of ethanol, and 31 to 310 grams of ethylene glycol, mix well, and the molar ratio is equivalent to that of ethyl orthosilicate Ester: water: ethanol: ethylene glycol is 1:3.5:4~20:1~10 to obtain a silica sol; gradually add 15.6 grams of nano-carbonyl iron powder to the sol, and stir evenly.

[0088] b. Add ammonia water with a concentration of 0.35 mol / L dropwise to the mixed solution obtained in step a, adjust the pH value to 2.5-3.5, and let it stand to age the ferrosilicon dioxide composite sol to form a gel.

[0089] c. Use acetone as a replacement agent to remove the water in the gel; then use acetone medium to add the gel, and then add 1% to 5% of the volume of the gel to disperse the sodium dodecylbenzenesulfonate dispersant to prevent Airgel nanopowders are agglomerated and then mixed by ball milling.

[0090] d. Use the method of norm...

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Abstract

The invention discloses a microwave absorbing material. The microwave absorbing material comprises, by volume, 0.1-90% of aerogel, 0.1-50% of a magnetic metal and 5-90% of a thermoplastic resin. The preparation method of the microwave absorbing material comprises the following steps of a, coating the surface of aerogel with the magnetic metal by adsorption to obtain composite material powder, and b, adding the thermoplastic resin into the composite material powder to obtain the thermoplastic resin-containing composite material. The microwave absorbing material has the advantages of high resistivity, small density and good microwave-absorbing performances.

Description

technical field [0001] The invention relates to a wave-absorbing material, especially a wave-absorbing material and a preparation method thereof. Background technique [0002] With the rapid development of science and technology, there are more and more technologies and various products that use electromagnetic waves as the medium, and the impact of electromagnetic radiation on the environment is also increasing. For example, radio waves may cause interference to the airport environment, causing aircraft flights to fail to take off normally; mobile phones may interfere with the work of various precision electronic medical devices; even ordinary computers will radiate electromagnetic waves carrying information, which may It is received and reproduced kilometers away, resulting in the leakage of national defense, political, economic, technological and other intelligence. Therefore, controlling electromagnetic pollution and finding a wave-absorbing material that can resist and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B26/10C08L25/06C08K3/36C08K3/08C04B14/48
Inventor 不公告发明人
Owner KUANG CHI INST OF ADVANCED TECH
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