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Iron oxide particle and preparation method thereof as well as electrorheological fluid

A technology of iron oxide and iron oxyhydroxide, applied in the field of electrorheological fluids, can solve the problems of poor anti-settling performance of dispersive particles, etc.

Active Publication Date: 2013-04-03
CHONGQING YUNTIANHUA HIGH END NEW MATERIALS DEV CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the anti-precipitation performance of the above-mentioned materials as dispersed particles of electrorheological fluids is still poor.

Method used

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  • Iron oxide particle and preparation method thereof as well as electrorheological fluid
  • Iron oxide particle and preparation method thereof as well as electrorheological fluid
  • Iron oxide particle and preparation method thereof as well as electrorheological fluid

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preparation example Construction

[0033] The embodiment of the present invention discloses a method for preparing iron oxide particles, comprising the following steps:

[0034] a) Mix iron salt, basic compound and dispersant in a solvent, react to obtain ferric oxyhydroxide, and coat the ferric oxyhydroxide with silicon dioxide;

[0035] b) heat-treating the product obtained in step a);

[0036] c) ultrasonically treating the product obtained in step b) in a basic compound to obtain iron oxide particles.

[0037] According to the present invention, in the process of preparing iron oxide particles, first react iron salt, basic compound and dispersant to obtain nanometer ferric oxyhydroxide; then nanometer ferric oxyhydroxide is coated with silicon dioxide, and then heat treated , to dehydroxylate ferric oxyhydroxide to obtain iron oxide coated with silica, and finally ultrasonically treat the iron oxide coated with silica in an alkaline compound to remove the oxide coated on the outer layer of iron oxide parti...

Embodiment 1

[0051] Adopt electronic analytical balance to weigh 20.2012gFe(NO 3 ) 3 9H 2 O and 3.0007g polyethylene glycol 400, dissolved in 250ml deionized water, heated and stirred with a magnetic stirrer at 140°C, kept the temperature of the reaction system at 100°C, heated for 2~3h, then slowly added 1M NaOH solution dropwise until The pH of the system is 9~10 to obtain ferric oxyhydroxide; then the ferric oxyhydroxide is centrifuged, washed 2 times with deionized water, and then washed 2~3 times with absolute ethanol to remove the water in the system, and then The washed particles are ultrasonically dispersed with a mixed solution of 100ml of ethanol and 400ml of cyclohexane, and then add 6ml of silane coupling agent and 15ml of 30wt% ammonia solution to the system. Ethyl silicate (TEOS) was reacted at room temperature for 24 hours to obtain ferric oxyhydroxide coated with silica. The obtained core-shell particles were washed with butanol, isopropanol, and ethanol in sequence, and ...

Embodiment 2

[0054] Adopt electronic analytical balance to weigh 20.2032g Fe(NO 3 ) 3 9H 2 O and 3.0022g polyethylene glycol 400, dissolved in 250ml deionized water, heated and stirred with a magnetic stirrer at 140°C, kept the temperature of the reaction system at 100°C, heated for 2~3h, then slowly added 1M NaOH solution dropwise until the system The pH is 9~10, and the ferric oxyhydroxide solution is obtained; the ferric oxyhydroxide solution is centrifuged, washed twice with deionized water, and then washed 2~3 times with absolute ethanol to remove the water in the system, and then The washed particles are ultrasonically dispersed with a mixed solution of 400ml cyclohexane and 100ml ethanol, then 6ml of silane coupling agent and 15ml of 30wt% ammonia solution are added to the system. Ethyl ester (TEOS) was reacted at room temperature for 24 hours to obtain ferric oxyhydroxide coated with silica; the obtained core-shell particles were washed with butanol, isopropanol and ethanol in se...

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Abstract

The invention provides a preparation method of an iron oxide particle, which comprises the steps of: firstly, mixing an iron salt, an alkali compound and a dispersing agent, and reacting to obtain nano iron oxide hydroxide; carrying out silicon dioxide coating on the nano iron oxide hydroxide, then thermally treating to ensure that the iron oxide hydroxide is subjected to de-hydroxylation to obtain silicon dioxide coated iron oxide; and finally, ultrasonically treating the silicon dioxide coated iron oxide in the alkali compound to obtain the nano hollow iron oxide particle. Because the iron oxide particle is of a hollow structure, the average density of the iron oxide particle is smaller due to the hollow structure inside the iron oxide particle, and therefore, the anti-precipitation performance of the iron oxide particle in base oil is improved; and then, the iron oxide particle is a nano particle, and the anti-participation performance of electrorheological fluid prepared by adopting the iron oxide particle is more excellent than that of the electrorheological fluid prepared by adopting a common dispersion phase particle.

Description

technical field [0001] The invention relates to the technical field of electrorheological fluid materials, in particular to iron oxide particles, a preparation method thereof and electrorheological fluid. Background technique [0002] Electrorheological fluid is a suspension composed of solid particles with high dielectric constant and insulating base fluid with low dielectric constant. Under the action of an external electric field, it can instantly change from liquid to solid, and its viscosity increases sharply so that it loses fluidity. Under the action of an electric field, the electrorheological fluid behaves like a solid, has a certain yield strength, and can continuously adjust the strength of the material by changing the magnitude of the applied electric field. After the external electric field is withdrawn, the electrorheological fluid material quickly returns to its initial state. Based on the characteristics of fast response and continuous regulation of electro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/06C10M125/10C10N40/14
Inventor 李艳江林戴曛晔叶兴福唐燕
Owner CHONGQING YUNTIANHUA HIGH END NEW MATERIALS DEV CO LTD
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