Attapulgite-clay-based electromagnetic wave absorber in metal-surface-coated electromagnetic wave-absorbing coating and preparation method of attapulgite-clay-based electromagnetic wave absorber

A wave-absorbing coating and metal surface technology, applied in coatings and other directions, can solve the problems of easy agglomeration, loss, and aerodynamic performance degradation of wave-absorbing materials, and achieve the effects of excellent wave-absorbing performance, strong absorption, and spectral bandwidth

Inactive Publication Date: 2017-03-08
NANJING UNIV OF INFORMATION SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The stealth capability of the weapon system can be realized through shape design and the use of stealth materials, but too many requirements on the shape will cause the decline of aerodynamic performance, and lead to the reduction of storage space and other losses, so the research on absorbing materials is carried out Be the key to stealth technology
Studies have shown that coating the metal surface of the weapon system with absorbing coatings can effectively reduce the radar scattering cross section, reduce the electromagnetic wave signal, and achieve the stealth effect. In 1991, Lijima of NEC Laboratory in Japan discovered carbon nanotubes, which are used in electromagnetic shielding and The field of microwave-absorbing materials has potential application value, but simply using carbon nanotubes as a wave-absorbing agent can achieve a relatively ideal dielectric loss, but the magnetic loss to electromagnetic waves is very small, and carbon nanotubes are poor in hydrophilicity. It is easy to agglomerate when preparing wave-absorbing materials, and it is easy to burn and lose under high-temperature air conditions of 500 ° C. In high-temperature parts such as aircraft tail nozzles, the working temperature is often above 700 ° C. Simply using carbon nanotubes is easy to lose the wave-absorbing performance.
The patent (CN104479626B) discloses a graphitized multi-walled carbon nanotube / nanoparticle composite wave absorbing agent and its preparation method, which has good wave absorbing performance, but the coating is easy to peel off under high temperature and high speed air washing, seriously affecting the material absorbing performance

Method used

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  • Attapulgite-clay-based electromagnetic wave absorber in metal-surface-coated electromagnetic wave-absorbing coating and preparation method of attapulgite-clay-based electromagnetic wave absorber

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preparation example Construction

[0021] An attapulgite-based wave-absorbing agent for metal surface coating, the preparation method comprising the following process steps:

[0022] 1. Weigh 100g of attapulgite clay with a fineness of 200-400 mesh, put it into 800-1000ml distilled water and stir it with a stirrer for 2-4 hours, and treat it with 50-100ml hydrochloric acid with a solubility of 1mol / L at 80-100°C 1 to 3 hours; add 5 to 10 ml of compound active agent to the treated suspension, then dropwise add NaOH solution to adjust the pH value of the suspension to 6 to 8, and then stir with a cross blade stirrer at 1500 rpm for 2 ~4 hours, after standing for 10 hours, the attapulgite clay suspension was separated;

[0023] 2. Add 10 to 20 g of carbon nanotubes to the above-mentioned separated attapulgite clay suspension, utilize the active adsorption of carbon nanotubes on the surface of the attapulgite, and stir for 10 to 30 minutes to obtain the attapulgite clay suspension;

[0024] 3. Add 10-20 g of sodiu...

Embodiment 1

[0030] 1. Weigh 100g of attapulgite clay with a fineness of 200 mesh, put it into 1000ml distilled water and stir it with a stirrer for 2 hours, and treat it with 100ml hydrochloric acid with a solubility of 1mol / L at 80-100°C for 2 hours; Add 5ml of composite active agent to the solution, the composite active agent includes organopolysiloxane and OP-10, then add dropwise NaOH solution to adjust the pH value of the suspension to 8, and then use a cross blade stirrer at 1500 rpm After stirring for 4 hours, after standing still for 10 hours, the attapulgite clay suspension was separated;

[0031] 2. Add 20 g of carbon nanotubes to the attapulgite clay suspension separated above, and use the active adsorption of carbon nanotubes on the surface of the attapulgite to obtain the attapulgite clay suspension after stirring for 30 minutes;

[0032] 3. Add 1 g of sodium hexametaphosphate and 30 g of nickel sulfate to 500 ml of deionized water, titrate ammonia water to adjust the pH=8.5 ...

Embodiment 2

[0037] 1. Weigh 100g of attapulgite clay with a fineness of 400 mesh, put it into 900ml distilled water and stir it with a stirrer for 3 hours, and treat it with 80ml hydrochloric acid with a solubility of 1mol / L at 8°C for 2 hours; add the treated suspension to The compound active agent of 8ml, described compound active agent comprises stearic acid and OP-10, then add dropwise NaOH solution to adjust the pH value of suspension to 8, then stir with cross blade stirrer with 1500 rev / min for 4 hours, After standing still for 10 hours, the attapulgite clay suspension was separated;

[0038] 2. Add 15 g of carbon nanotubes to the above-mentioned separated attapulgite clay suspension, utilize the active adsorption of carbon nanotubes on the surface of the attapulgite, and after stirring for 30 minutes, obtain the attapulgite clay suspension;

[0039] 3. Add 20 g of sodium hexametaphosphate and 30 g of nickel sulfate in 500 ml of deionized water, titrate ammonia water to adjust the ...

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Abstract

The invention discloses an attapulgite-clay-based electromagnetic wave absorber in a metal-surface-coated electromagnetic wave-absorbing coating. The electromagnetic wave absorber refers to the attapulgite-clay-based electromagnetic wave absorber which is prepared by combining carbon nano-tubes with high-temperature-resistant attapulgite clay powder. Particularly, a preparation method of the attapulgite-clay-based electromagnetic wave absorber includes the steps of activating and dispersing common attapulgite clay to obtain attapulgite clay suspension excellent in activation performance, adding a specific number of carbon nano-tubes, using activity of the surface of the attapulgite clay to absorb the carbon nano-tubes to obtain one-dimensional nano-tube/attapulgite clay compound powder, plating metal ions on the surface of the compound powder through chemical plating, centrifuging and drying so as to obtain the attapulgite-clay-based electromagnetic wave absorber. The attapulgite-clay-based electromagnetic wave absorber is excellent in electromagnetic wave absorption performance, high in absorption performance and wide in spectrum band and is capable of absorbing 90% of electromagnetic waves within a range of 5-18 GHz, and the maximum reflection loss can be up to -44 dB (5 GHz).

Description

technical field [0001] The invention relates to the technical field of inorganic functional materials, in particular to an attapulgite-based wave-absorbing agent in wave-absorbing coatings coated on metal surfaces and a preparation method thereof. Background technique [0002] In modern and future wars, radar is the most reliable means of detecting targets, and research on stealth technology focuses on radar stealth. The stealth capability of the weapon system can be realized through shape design and the use of stealth materials, but too many requirements on the shape will cause the decline of aerodynamic performance, and lead to the reduction of storage space and other losses, so the research on absorbing materials is carried out Be the key to stealth technology. Studies have shown that coating the metal surface of the weapon system with absorbing coatings can effectively reduce the radar scattering cross section, reduce the electromagnetic wave signal, and achieve the ste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D7/12
CPCC08K3/346C08K7/24C08K9/02C08K9/10C08K2201/011C09D7/62
Inventor 姚义俊万韬隃张杭鑫张彬杨佳伟张俊阳
Owner NANJING UNIV OF INFORMATION SCI & TECH
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