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A kind of preparation method of ultrathin carbon nanotube wave absorbing coating material

A carbon nanotube and wave-absorbing coating technology, which is applied in the field of preparation of ultra-thin carbon nanotube wave-absorbing coating materials, can solve the problems of complex coating preparation process, limited wave-absorbing performance, long production cycle, etc. The process is simple and mature, the microwave absorption performance is not reduced, and the weight is reduced

Active Publication Date: 2021-10-08
西安纳科新材料科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the coating preparation process is relatively complicated, the production cycle is long, the cost is high, and the absorbing performance is very limited under thin thickness.
After preliminary research, it was found that the current materials rarely achieve full-band ultra-thin absorption in the military radar frequency range of 8-18 GHz, and there are few reports on carbon-based wave-absorbing coatings that achieve broadband absorption of electromagnetic waves below 1.0 mm in thickness.

Method used

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  • A kind of preparation method of ultrathin carbon nanotube wave absorbing coating material
  • A kind of preparation method of ultrathin carbon nanotube wave absorbing coating material
  • A kind of preparation method of ultrathin carbon nanotube wave absorbing coating material

Examples

Experimental program
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Effect test

Embodiment 1

[0037] (1) Add 4 g of carbon nanotube powder into a mixed solution of 320 mL of concentrated sulfuric acid and concentrated nitric acid, stir magnetically for 0.5 h in an ice-water bath environment, then add 12 g of potassium permanganate (slowly added), and continue stirring for 2 h;

[0038] (2) Adjust the temperature of the water bath to 30°C, stir magnetically for 4 hours, add 400 mL of deionized water for dilution (slow drainage), then add 120 mL of hydrogen peroxide solution (5.0%), and stir for 0.5 hours;

[0039] (3) Suction filter the mixed solution prepared in step 2 for 4 times, wash it with deionized water for 5 to 6 times, add hydroquinone (mass ratio to CNTs is 2:1) and stir for 10 minutes, seal it, and then place it in In a constant temperature drying oven, after heating to 100°C, keep the constant temperature for 12 hours;

[0040] (4) The mixed solution in step 3 is taken out, suction filtered 3 times, then washed 4 times with deionized water, then placed in a...

Embodiment 2

[0045] (1) Add 4 g of carbon nanotube powder into a mixed solution of 360 mL of concentrated sulfuric acid and concentrated nitric acid, stir magnetically for 1 h in an ice-water bath environment, then add 16 g of potassium permanganate (slowly added), and continue stirring for 2 h;

[0046] (2) Adjust the temperature of the water bath to 35°C, stir magnetically for 6 hours, add 400 mL of deionized water for dilution (slow drainage), then add 160 mL of hydrogen peroxide solution (5.0%), and stir for 0.5 hours;

[0047] (3) Suction filter the mixed solution prepared in step 2 for 6 times, wash it with deionized water for 5-6 times, add hydrazine hydrate (3:1 mass ratio to CNTs) and stir for 15 minutes, then seal it, and then dry it at constant temperature In the box, after heating to 25°C, keep the constant temperature for 14h;

[0048] (4) Take out the mixed solution in step 3, filter it twice, wash it three times with deionized water, and then place it in a freeze dryer for v...

Embodiment 3

[0053] (1) Add 4 g of carbon nanotube powder into a mixed solution of 400 mL of concentrated sulfuric acid and concentrated nitric acid, stir magnetically for 1 h in an ice-water bath environment, then add 20 g of potassium permanganate (slowly added), and continue stirring for 1.5 h;

[0054] (2) Adjust the temperature of the water bath to 30°C, stir magnetically for 8 hours, add 400mL deionized water for dilution (slow drainage), then add 200mL hydrogen peroxide solution (5.0%), and stir for 0.5h;

[0055] (3) Suction filter the mixed solution prepared in step 2 for 5 times, wash it with deionized water for 5 to 6 times, add hydroiodic acid (4:1 mass ratio to CNTs) and stir for 15 minutes, seal it, and then place it at a constant temperature In the drying oven, after heating to 20°C, keep the constant temperature for 16 hours;

[0056] (4) The mixed solution in step 3 was taken out, suction filtered 4 times, then washed 6 times with deionized water, then placed in a freeze d...

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Abstract

The invention discloses a preparation method of an ultra-thin carbon nanotube wave-absorbing coating material. The method uses a method of mixing strong acid combined with a strong oxidant to carry out strong oxidation treatment on the surface of carbon nanotubes, and prepares a special "fluffy" surface. To modify the morphology of carbon nanotubes, different polymer materials are selected as the matrix, and the ultra-thin broadband carbon nanotube wave-absorbing coating material is obtained by adjusting the ratio between the content of the absorber and the polymer material. The coating material prepared by the invention solves the shortcomings of the existing wave-absorbing coating materials such as large thickness, heavy mass, narrow absorption frequency band, and complicated preparation process. With a thickness of less than 1.0mm, the coating can achieve full-band absorption of radar wave X-band and Ku-band less than -4dB, and the frequency width of reflection loss <-10dB can reach 5.23GHz.

Description

technical field [0001] The invention belongs to the structural design of a wave-absorbing material, in particular to a preparation method and application of an ultra-thin carbon nanotube wave-absorbing coating material. Background technique [0002] Absorbing material is a kind of material that can resist and weaken electromagnetic radiation. It has extremely important application value in national defense and civilian fields. Because of its high performance, simple preparation process and easy coating and use, it is widely used in various The protective stealth of ground weapons and equipment is one of the most effective stealth means at present, and the key to the absorbing performance of the coating lies in the selection of absorbing agent fillers. [0003] Since the discovery of carbon nanotubes, their unique structure and electromagnetic properties have attracted extensive attention. Due to the quantum effect, small size effect and surface effect of carbon nanotubes, a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D163/00C09D183/04C09D109/02C09D5/32
CPCC08K2201/011C09D5/32C09D109/02C09D163/00C09D183/04C08K9/04C08K9/02C08K3/041
Inventor 苏勋家何惊华龙昌唐桂芳李凡霞
Owner 西安纳科新材料科技有限公司
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