Magnetic particle with high antioxidant for magnetic flow liquid and preparation method thereof

A technology of magnetic particles and magnetorheological fluids, applied in the direction of magnetic fluids, etc., can solve the problems of high price, unfavorable magnetorheological fluids, and no public reports in domestic and foreign literatures, and achieve high acid corrosion resistance and good oxidation resistance performance effect

Inactive Publication Date: 2006-01-25
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, metal plating and the use of iron alloys are complicated and expensive, and the coating layer prepared by the general polymer coating method is relatively thick (greater than tens of microns), which will increase the zero-field viscosity of the magnetorheological fluid, shear The shear yield stress is reduced, which is very unfavorable for the application of magnetorheological fluids
The present invention utilizes tetraethyl orthosilicate (TEOS) hydrolysis-polycondensation method to coat a layer of SiO on the surface of magnetic particles 2 film, prepared magnetic composite particles, in order to obtain a nano-SiO 2 Film-coated magnetic particles with good oxidation resistance, the method has not been publicly reported in domestic and foreign literature

Method used

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  • Magnetic particle with high antioxidant for magnetic flow liquid and preparation method thereof
  • Magnetic particle with high antioxidant for magnetic flow liquid and preparation method thereof
  • Magnetic particle with high antioxidant for magnetic flow liquid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The raw materials used in the embodiment are as follows:

[0033] Reduced iron powder (analytical grade) was provided by China National Pharmaceutical (Group) Shanghai Chemical Reagent Company.

[0034] Absolute ethanol (analytical grade) was provided by Shanghai Sanaisi Reagent Co., Ltd.

[0035] Ammonia water (analytical pure), China Pharmaceutical Group Shanghai Chemical Reagent Co., Ltd.

[0036] Orthoethyl silicate (TEOS), China Pharmaceutical Group Shanghai Chemical Reagent Co., Ltd.

[0037] The ratio of raw materials used is as follows:

[0038] 100 parts (weight) of reduced iron powder

[0039] Tetraethyl silicate 5 parts (weight)

[0040] 30 parts of ammonia water (weight)

[0041] 100 parts (weight) of absolute ethanol

[0042] nano-SiO 2 Preparation of film-coated magnetic particles:

[0043] Weigh 100g of iron powder, place it in 100g of absolute ethanol, add 5g of tetraethyl orthosilicate, stir and disperse fully, slowly add 30g of ammonia water wi...

Embodiment 2

[0050] The ratio of raw materials used is as follows:

[0051] 100 parts (weight) of reduced iron powder

[0052] Tetraethyl silicate 100 parts (weight)

[0053] Ammonia 15 parts (weight)

[0054] 500 parts (weight) of absolute ethanol

[0055] 30 parts of deionized water (by weight)

[0056] nano-SiO 2 Preparation of film-coated magnetic particles:

[0057] Weigh 100g of iron powder, put it in 500g of absolute ethanol, add 30g of tetraethyl orthosilicate, stir and disperse fully, slowly add 15g of 25% ammonia water and 30g of deionized water dropwise, at a stirring speed of 500rpm React at room temperature for 24 hours. After the reaction, first wash with absolute ethanol and filter, then wash with deionized water, magnetically separate, and then wash with deionized water, repeating several times to remove the remaining TEOS and SiO 2 Sol and SiO not coated on the surface of iron powder 2 particles.

[0058] The determination of the properties of the magnetic composi...

Embodiment 3

[0060] The ratio of raw materials used is as follows:

[0061] 100 parts (weight) of reduced iron powder

[0062] Tetraethyl silicate 50 parts (weight)

[0063] 500 parts (weight) of absolute ethanol

[0064] 1000 parts (weight) of deionized water

[0065] nano-SiO 2 Preparation of film-coated magnetic particles:

[0066] Weigh 100g of iron powder, put it in 500g of absolute ethanol, add 50g of tetraethyl orthosilicate, stir and disperse fully, slowly add 1000g of deionized water dropwise, and react at room temperature at a stirring speed of 200rpm for 24 hours. After the reaction, first wash with absolute ethanol, wash with deionized water, magnetically separate, and then wash with deionized water, repeat several times to remove the remaining TEOS, SiO 2 Sol and SiO not coated on the surface of iron powder 2 particles.

[0067] The determination of the properties of the magnetic composite particles is similar to that of Example 1, and its oxidation resistance, acid cor...

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Abstract

This invention relates to iron-base soft magnetic particles with high non-oxidation used in magnetic rheological liquid and its preparation method, which utilizes TEOS hydrolytic condensation reaction to cover a layer of SiO2 film on the magnetic particle surface to prepare magnetic composite particles, which have good non-oxidation performance, acid corrosion resistance and rather high magnetic strength.

Description

technical field [0001] The invention belongs to the technical field of magnetic materials and functional materials, and in particular relates to iron-based soft magnetic particles for magnetorheological fluids with high oxidation resistance and a preparation method thereof. Background technique [0002] Magneto-rheological fluid (MRF) is a new type of functional material, and its shear stress will change sharply under an external magnetic field. Compared with electrorheological fluid (ERF), magnetorheological fluid has the characteristics of small volume, low power consumption, large damping force, wide dynamic range, high frequency response, and large application area, especially it can generate It has the best damping force, so it has broad application prospects in the fields of intelligent structures, automobiles, machinery, construction, and medical treatment. At present, iron-based particles are one of the most commonly used soft magnetic particles in magnetorheologica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/44
Inventor 浦鸿汀蒋峰景杨正龙
Owner TONGJI UNIV
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