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Method for preparing hollow magnetic composite particulate for magnetic rheologic liquid by using polystyrene microsphere

A technology of composite particles and magnetorheological fluids, which is applied in the field of composite materials and functional materials, can solve problems affecting the performance and popularization of magnetorheological fluids, easy sedimentation, high density, etc., and achieve excellent sedimentation stability, shear High stress and good magnetic properties

Inactive Publication Date: 2005-06-29
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the magnetic particles in traditional magnetorheological fluids are easy to agglomerate and settle because their density is much higher than that of the medium, which seriously affects the performance and application of magnetorheological fluids.
Fe 3 o 4 Particles are no exception, too dense and easy to settle, limiting its application in this field

Method used

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  • Method for preparing hollow magnetic composite particulate for magnetic rheologic liquid by using polystyrene microsphere
  • Method for preparing hollow magnetic composite particulate for magnetic rheologic liquid by using polystyrene microsphere

Examples

Experimental program
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Embodiment 1

[0029] The ratio of raw materials used is as follows:

[0030] Hollow PS microspheres (average particle diameter 2.5μm) 100 parts (weight)

[0031] Sodium lauryl sulfate 5 parts (weight)

[0032] 100 parts (weight) of ferric chloride

[0033] 50 parts (weight) of ferrous sulfate heptahydrate

[0034] 50 parts (weight) of sodium hydroxide

[0035] Preparation of magnetic composite particles:

[0036] According to the proportion of the above components, the hollow PS microspheres were ultrasonically dispersed in deionized water for 3 hours to obtain sample a. Make a solution of ferric chloride and ferrous sulfate heptahydrate into the reaction vessel, add sample a, stir and heat for 0.5-1 hour, and raise the temperature to 60°C; dissolve NaOH in deionized water to form a solution, and add it to the reaction vessel After stirring for 1 hour, continue to heat up to 90°C, stop heating, add sodium lauryl sulfate, and cool under st...

Embodiment 2

[0042] The proportioning of used raw materials by weight share is as follows:

[0043] Hollow PS microspheres (average particle size 50nm) 100 parts

[0044] Sodium Lauryl Sulfate 0 parts

[0045] Fe(NO 3 ) 3 50 copies

[0046] FeSO 4 20 copies

[0047] Sodium hydroxide 20 parts

[0048] Preparation of magnetic composite particles:

[0049] According to the proportion of the above components, the hollow PS microspheres were ultrasonically dispersed in deionized water for 2 hours to obtain sample a. Fe(NO 3 ) 3 and FeSO 4 Make a solution and add it to the reaction vessel, add sample a, stir and heat for about 1 hour, and then raise the temperature to 65°C; dissolve NaOH in deionized water to make a solution, add it to the reaction vessel, stir and react for 1.5 hours, then continue to heat up to 95°C , stop heating, and cool under stirring. Wash with deionized water until neutra...

Embodiment 3

[0051]The proportioning of used raw materials by weight share is as follows:

[0052] Hollow PS microspheres (average particle diameter 20μm) 100 parts (weight)

[0053] Sodium lauryl sulfate 50 parts (weight)

[0054] Fe 2 (SO 4 ) 3 400 parts (weight)

[0055] FeCl 2 200 parts (weight)

[0056] NH 3 h 2 O 200 parts (weight)

[0057] Preparation of magnetic composite particles:

[0058] The hollow PS microspheres were ultrasonically dispersed in deionized water for 5 hours to obtain sample a. Will Fe 2 (SO 4 ) 3 and FeCl 2 Prepare a solution and add it to a reaction vessel, add sample a, stir and heat for 1-1.5 hours, and raise the temperature to 55°C; add NH 3 h 2 O was dissolved in deionized water to make a solution, added to the reaction vessel and stirred for 1 hour, then continued to heat up to 100°C, stopped heating, added sodium lauryl sulfate, and cooled under stirring. Wash w...

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Abstract

The invention belongs to compound material and function material technological field, concretely are a shallow magnetic compound micro particle for magnetic rheologic liquid and its preparing method. The micro ball is formed by covering a layer of Fe3O4 on the shallow polystyrene micro ball, and it is comprised of shallow polystyrene micro ball, trivalent ferric salt, bivalent ferric salt, dispersant and alkali which are mixed by proper ratio. Through supersonic dispersion, covering micro particle and after-procession, the product is made. The product made by the invention has small density, good magnetic performance, high shearing stress and outstanding depositing stability.

Description

technical field [0001] The invention belongs to the technical field of composite materials and functional materials, and in particular relates to a hollow magnetic particle for magnetorheological fluid and a preparation method thereof. Background technique [0002] Hollow microspheres are a new type of particulate material developed in the 1950s and 1960s. Its most notable features are low density, high mechanical strength and good stability. Magnetic oxide Fe 3 o 4 It can be prepared into particles with a particle diameter of tens of nanometers, and has a good application prospect as a magnetorheological fluid material. However, the density of magnetic particles in traditional magnetorheological fluids is much higher than that of the medium, so they are easy to agglomerate and settle, which seriously affects the performance and application of magnetorheological fluids. Fe 3 o 4 Particles are no exception, too dense and easy to settle, limiting its application in this ...

Claims

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Application Information

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IPC IPC(8): C08J7/06C08L25/06H01F1/44
Inventor 浦鸿汀蒋峰景杨正龙
Owner TONGJI UNIV
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