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Wave-absorbing coating and preparation method thereof

A technology of wave-absorbing coatings and wave-absorbing coatings, applied in coatings, radiation-absorbing coatings, epoxy resin coatings, etc., can solve the problems of small absorption peaks and narrow absorption bandwidths, and achieve the expansion of absorption bandwidths and preparation methods The effect of simplicity and ease of industrial production

Pending Publication Date: 2019-07-05
LUOYANG INST OF CUTTING EDGE TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the field of engineering, most of the current absorbing materials have shortcomings such as small absorption peak and narrow absorption bandwidth. Therefore, how to expand the absorption bandwidth while ensuring the absorbing performance has always been an urgent problem in the industry.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0019] The preparation method of the wave-absorbing coating provided by the invention comprises the following steps:

[0020] First, mix a certain amount of carbon black and silicon carbide to obtain a mixture, then add a silane coupling agent to the mixture, and ball mill to obtain a wave absorbing agent. In this step, in parts by mass, 50-66 parts of the mixture obtained by mixing carbon black and silicon carbide and 2-5 parts of silane coupling agent are ball-milled in a ball mill to make them evenly mixed to obtain a modified wave-absorbing agent, wherein, in the mixture, the mass ratio of carbon black to silicon carbide is 0.5-1.5:6-10, the carbon black is selected from one or more combinations of acetylene carbon black and conductive carbon black, and the silane coupling agent A combination of one or more selected from alkenyl silane coupling agents, chlorohydrocarbyl silane coupling agents, aminohydrocarbyl silane coupling agents, epoxyhydrocarbyl silane coupling agents...

Embodiment 1

[0026] In parts by mass, 1 part of acetylene carbon black and 6 parts of silicon carbide were mixed, and then 0.7 parts of alkenyl silane coupling agent was added thereto, and ball milled in a ball mill to mix them uniformly to obtain a modified wave absorbing agent. Then take 5.6 parts of epoxy resin and 0.7 parts of maleic anhydride, mechanically stir for 10 minutes to make them evenly mixed, add the modified wave absorbing agent prepared above into the mixture, stir for 30 minutes, make the wave absorbing agent in the epoxy resin Disperse evenly to obtain a wave-absorbing coating, and then paint it on an aluminum plate to prepare a 2mm-thick wave-absorbing coating, and finally place it in a vacuum drying oven, keep the vacuum, and cure at 80°C for 2 hours, and then cure at 100°C 1h, curing at 120°C for 2h.

[0027] The reflection attenuation rate of the wave-absorbing coating is better than -10dB in the wide frequency range of 11.3-16.4GHz, and the maximum absorption peak r...

Embodiment 2

[0029] In parts by mass, 1 part of conductive carbon black and 10 parts of silicon carbide were mixed, and then 0.33 parts of chlorohydrocarbon-based silane coupling agent was added thereto, and ball milled in a ball mill to mix uniformly to obtain a modified wave absorbing agent. Then take 5 parts of epoxy resin and 0.33 parts of phthalic anhydride, mechanically stir for 20 minutes to make them uniformly mixed, add the modified wave absorbing agent prepared above into the mixture, and stir for 60 minutes to make the wave absorbing agent in the epoxy resin Disperse evenly to obtain a wave-absorbing coating, and then paint it on an aluminum plate to prepare a 2mm-thick wave-absorbing coating, and finally place it in a vacuum drying oven, keep the vacuum, and cure at 80°C for 4 hours, and then cure at 100°C 3h, curing at 120°C for 4h.

[0030] The reflection attenuation rate of the wave-absorbing coating is better than -10dB in the wide frequency range of 7.2-13.1GHz, and the ma...

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Abstract

The invention provides a wave-absorbing coating and a preparation method thereof. Micron silicon carbide and carbon black are compounded and modified by a silane coupling agent, and then the product is compounded in matrix resin to prepare a wave-absorbing agent with excellent performance. Silicon carbide utilizes dielectric polarization relaxation to lose electromagnetic wave and has poor magnetic properties, while carbon black has good electrical conductivity, light weight and low price, but still has the disadvantages of low absorption peak, narrow absorption bandwidth and the like. The invention combines the advantages of the two, and micron silicon carbide and carbon black are compounded and modified by a silane coupling agent to prepare the wave-absorbing agent with excellent performance. The preparation method provided by the invention is simple and easy to realize industrial production, and can be widely applied to clutter rejection, anti-electromagnetic interference and othertechnical fields of mobile phones, electronic instrument equipment, high frequency equipment, microwave active devices, radar and microwave communication systems.

Description

technical field [0001] The invention relates to the field of composite materials, in particular to a wave-absorbing coating and a preparation method thereof. Background technique [0002] With the development of electronic science and technology, electronic information equipment has been widely used in all walks of life. The influence of electromagnetic waves on human beings has also penetrated into every corner. It is irreplaceable in mechanical, electronic and biological fields. While electromagnetic technology has brought great convenience to people, it has also seriously attracted serious electromagnetic radiation pollution. Electromagnetic radiation will not only interfere with electronic instruments and equipment, causing them to malfunction, but also affect human health, interfere with normal physiological functions of the human body, and may even cause diseases. Therefore, wave-absorbing materials for controlling electromagnetic pollution have emerged as the times...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D163/00C09D175/04C09D161/06C09D4/06C09D5/32
CPCC08K3/04C08K3/34C08K5/1539C08K5/17C08K9/06C08K2201/001C09D4/06C09D5/32C09D161/06C09D163/00C09D175/04
Inventor 不公告发明人
Owner LUOYANG INST OF CUTTING EDGE TECH
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