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Composite absorbing material, preparation method and application thereof

A technology of composite absorbing materials and mixtures, which is applied in the field of absorbing materials to achieve excellent absorbing effects

Inactive Publication Date: 2015-11-25
KUANG CHI INST OF ADVANCED TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the absorbing materials in the prior art all have unchangeable wave frequency absorption width and fixed absorption peak position. Therefore, a wave absorbing material with variable absorption peak position that can be used in different application environments is needed

Method used

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  • Composite absorbing material, preparation method and application thereof
  • Composite absorbing material, preparation method and application thereof
  • Composite absorbing material, preparation method and application thereof

Examples

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preparation example Construction

[0039] Preparation of Electrically Tunable Composite Absorbing Material

[0040] like figure 1 As shown in step S101, the silicone rubber and carbon nanotubes are dispersed into the organic solvent by an ultrasonic stirrer, thereby forming a first mixture. The organic solvent may include any solvent capable of dissolving silicone rubber, preferably, the organic solvent includes benzene, toluene and xylene. like figure 2 As shown, in the present invention, in order to make the final composite material have good wave-absorbing width and wave-absorbing ability, and have adjustable performance, the carbon nanotubes used are all multi-walled carbon nanotubes, and the carbon The average length of the nanotubes should be in the range of 40 microns to 80 microns, and the average diameter of the carbon nanotubes should be in the range of 5 microns to 20 microns. Preferably, the average length of the carbon nanotubes should be 50 microns, and the average diameter should be in the ra...

Embodiment 1

[0056] 98.75g silicone rubber (purchased from Dow Corning (DowCorningCooperation)) and 0.25g multi-walled carbon nanotubes (purchased from Chengdu Times Nano Chemical Company, Chinese Academy of Sciences) were dispersed in benzene solvent using an ultrasonic stirrer, wherein, the multi-walled carbon nanotubes The average length is 50 microns and the average diameter is 8 to 15 microns. The dispersion time was 20 minutes. Then 1 g of curing agent (purchased from Dow Corning (Dow Corning Cooperation)) was added to the above mixture and stirred for 10 minutes. The obtained mixed solution was heated in an oven at a temperature of 50° C. for 10 hours to remove the solvent benzene. The silicone rubber and curing agent used in the embodiment are all purchased from Dow Corning Corporation (DowCorningCooperation), and the brand is SYLGARD170; and this kind of silicone rubber is AB component silicone rubber, A component is silicone rubber, and B component is the The corresponding curi...

Embodiment 2

[0063] 96.5g silicone rubber (purchased from Dow Corning (DowCorningCooperation)) and 0.5g multi-walled carbon nanotubes (purchased from Chengdu Times Nanochemical Company, Chinese Academy of Sciences) were dispersed in toluene solvent using an ultrasonic stirrer, wherein, the multi-walled carbon nanotubes The average length is 50 microns and the average diameter is 8 to 15 microns. The dispersion time was 10 minutes. Then 2 g of curing agent (purchased from Dow Corning Cooperation) and 1 g of silicon dioxide were added to the above mixture and stirred for 15 minutes. The obtained mixed solution was heated in an oven at a temperature of 70° C. for 9 hours to remove the solvent toluene.

[0064] Subsequently, the solvent-removed mixture was coated on a glass substrate using a spin coater, wherein the rotation speed of the spin coater was 3000 rpm, and the coating thickness was 20 microns. Afterwards, the glass substrate and the coating were heated together in an oven at a tem...

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Abstract

The invention provides a composite absorbing material, which comprises the following components by weight percentage: 90%(weight)-98.75%(weight) of silicone rubber, 0.2%(weight)-5%(weight) of carbon nano tube, and 1%(weight)-9%(weight) of accessory ingredient. The invention provides a preparation method of the composite absorbing material and an application of the composite absorbing material. According to the invention, the problems of difficult change of wave frequency absorption width and fixed position of absorption peak according to concrete application environment in prior art can be solved. The composite absorbing material has excellent wave-absorbing effect in wide frequency band, simultaneously, in different applications, different electric fields are applied on the composite absorbing material according to requirement, wave absorption width and absorption peak position of the composite absorbing material can be changed, so that expected wave absorption effect can be reached by aiming at different application environment.

Description

technical field [0001] The present invention generally relates to the field of wave-absorbing materials, and more specifically, relates to an electrically adjustable composite wave-absorbing material, a preparation method and an application thereof. Background technique [0002] With the development of modern science and technology, the harm of electromagnetic radiation to the environment is increasing day by day. At the airport, flights are delayed due to electromagnetic wave interference; in hospitals, mobile phones often interfere with the normal work of various electronic medical instruments. Therefore, controlling electromagnetic pollution and finding materials that can resist and weaken electromagnetic radiation have become a major topic in material science. [0003] Absorbing materials refer to a type of composite material that can effectively absorb and attenuate incident electromagnetic waves. It converts incident electromagnetic waves into heat energy or other for...

Claims

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Application Information

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IPC IPC(8): C08L83/07C08L83/08C08K7/00C08K3/04C09K3/00
Inventor 不公告发明人
Owner KUANG CHI INST OF ADVANCED TECH
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