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A method of using magnetic fluid to prepare wave-absorbing materials

A technology of wave absorbing material and magnetic fluid, applied in the field of wave absorbing material, can solve the problems of limited application, insufficient wave width, thickness and weight of wave absorption, and achieve low product cost, good magnetic anisotropy, stability, absorption, etc. The effect of increased length

Inactive Publication Date: 2015-10-28
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the microwave-absorbing materials in the prior art have deficiencies in the microwave-absorbing bandwidth, thickness and weight, which restrict their application.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Preparation of Fe 3 o 4 Ferrofluid

[0031] Magnetic nanoparticles were prepared by ultrasonic-assisted chemical co-precipitation method, and 30 g of FeCl 3 ·6H 2 O solid and 15 g of FeSO 4 ·7H 2 O powder, mix and dissolve it in deionized water, then put it into a constant temperature water bath, keep the temperature at 85°C; measure 80ml of 25-28%NH 3 ·H 2 O was slowly added to the beaker and kept stirring. After reacting for a certain period of time, add 15ml of absolute ethanol and let it stand for a while; adjust the pH of the solution to 4.5 with an appropriate amount of hydrochloric acid, add 3g of sodium oleate powder, and continue to stir for 10min , the black Fe 3 o 4 colloid, washed Fe several times with deionized water and acetone 3 o 4 colloid; dried to Fe 3 o 4 Magnetic nanoparticles, add 1ml surfactant OP-7, the oleic acid of 0.5ml and the kerosene of 50ml in the magnetic particle, after fully stirring, use ultrasonic dispersion 5min again,...

Embodiment 2

[0038] (1) Preparation of Fe3O4 magnetic fluid

[0039] Magnetic nanoparticles were prepared by ultrasonic-assisted chemical co-precipitation method, and 80 g of FeCl was weighed 3 ·6H 2 O solid and 50 g of FeSO 4 ·7H 2 O powder, mix and dissolve it in deionized water, then put it in a constant temperature water bath, keep the temperature at 55°C; measure 150ml of 25-28%NH 3 ·H 2 O was slowly added to the beaker and kept stirring. After reacting for a certain period of time, add 40ml of absolute ethanol and let it stand for a while; adjust the pH of the solution to 5.5 with an appropriate amount of hydrochloric acid, add 30g of sodium oleate powder, and continue stirring for 60min , the black Fe 3 o 4 colloid, washed Fe several times with deionized water and acetone 3 o 4 colloid; dried to Fe 3 o 4 Magnetic nanoparticles, add 20ml of surfactant OP-7, 10ml of oleic acid and 300ml of silicone oil to the magnetic particles, and then use ultrasonic dispersion for 30min a...

Embodiment 3

[0046] (1) Preparation of Fe 3 o 4 Ferrofluid

[0047] Magnetic nanoparticles were prepared by ultrasonic-assisted chemical co-precipitation method, and 50 g of FeCl 3 ·6H 2 O solid and 30 g of FeSO 4 ·7H 2 O powder, mix and dissolve it in deionized water, then put it into a constant temperature water bath, keep the temperature at 70°C; measure 110ml of 25-28%NH 3 ·H 2 O was slowly added to the beaker and kept stirring. After reacting for a certain period of time, add 25ml of absolute ethanol and let it stand for a while; adjust the pH of the solution to 5.0 with an appropriate amount of hydrochloric acid, add 16g of sodium oleate powder, and continue stirring for 30min , the black Fe 3 o 4 colloid, washed Fe several times with deionized water and acetone 3 o 4 colloid; dried to Fe 3 o 4 For magnetic nanoparticles, add 10ml of surfactant OP-7, 5ml of oleic acid and 170ml of silicone oil to the magnetic particles, and then use ultrasonic dispersion for 15min after f...

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Abstract

The invention discloses a method for preparing a wave absorbing material from magnetic fluid, and belongs to the field of a wave absorbing material. The wave absorbing material is composed of a composite material coating and a semiconductor coating; the magnetic fluid which is highly stable is prepared by preparing Fe3O4 magnetic nanoparticles by adopting a chemical coprecipitation method, and ultrasonically dispersing a proper amount of surfactant in base carrier liquid; the composite material coating is prepared by uniformly mixing epoxy resin, nickel carbonyl powder and the magnetic fluid so as to obtain a mixture I, and coating n aluminum alloy sheet with the mixture I under the action of an external magnetic field; the semiconductor coating is prepared by uniformly mixing epoxy resin and silicon carbide powder so as to obtain a mixture II, and coating the composite material coating with the mixture II. According to the method disclosed by the invention, the magnetic fluid is cured on the surface of substrate under the action of the external stable magnetic field after a magnetic cone is formed, so as to greatly increase absorption length and widen the absorption band. Meanwhile, the wave absorbing material prepared by adopting the method disclosed by the invention has the advantages of light weight, low thickness and the like, and is convenient in industrial production on a large scale.

Description

field of invention [0001] The invention relates to a method for preparing a wave-absorbing material by using a magnetic fluid, and belongs to the field of wave-absorbing materials. Background of the invention [0002] Absorbing material refers to a class of materials that can absorb electromagnetic wave energy projected onto its surface. In engineering applications, in addition to requiring a high absorption rate of electromagnetic waves in a wide frequency band, the absorbing material is also required to have properties such as light weight, temperature resistance, moisture resistance, and corrosion resistance. In recent years, with the popularization of various electrical appliances, the wide application of electronic computers, communication satellites, high-voltage transmission grids and some medical equipment, the resulting radiation pollution has become more and more serious, so necessary protection must be carried out. Absorb. Electromagnetic absorbing materials can...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B9/04B32B27/06B32B27/20C09D163/00C09D7/12
Inventor 邵慧萍刘万斌赵子粉林涛郭志猛王志
Owner UNIV OF SCI & TECH BEIJING
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