Magnetic particle with hydrophilic polymer coating, preparation and water-base magnetic flowing deformating liquid therefrom

A hydrophilic polymer and magnetic particle technology, applied in lubricating composition, dyeing polymer organic compound treatment, petroleum industry, etc., can solve the problems of easy oxidative deterioration and caking, poor suspension stability of magnetic metal particles, etc. The effect of good compatibility, good anti-oxidation performance and excellent soft magnetic properties

Inactive Publication Date: 2006-04-26
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a magnetic particle wrapped by a hydrophilic polymer and its preparation method and a water-based magnetorheological fluid composed of it, which overcomes the problems of poor suspension stability of magnetic metal particles in water, easy oxidation, deterioration and agglomeration. Disadvantages, the provided hydrophilic polymer-wrapped magnetic particles have good oxidation resistance, good compatibility with water or hydrophilic media, and can be used as suspended particles of water-based MR fluids; while providing this hydrophilic A convenient and easy preparation method of magnetic particles wrapped in water-based polymer

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0023] Coat the surface with γ-Fe 2 o 3 Add 56.0g of carbonyl iron powder, 1.2mL of ethyl silicate, and 50mL of DMF solution of 0.04mol / L triethoxy-ω-(methoxypolyoxyethylene urethane)propylsilane into a three-necked flask, Stir at high speed for 30 minutes to make them fully mixed, then adjust the pH of the system to 8.0 by slowly adding 1.0mol / L ammonia water 10ml dropwise while stirring, then stir for 48 hours under the condition of 500r / min, finally, magnetic separation, deionization Wash with water, repeat this process 3 times, and collect the solids and dry them in vacuum at 80°C for 8 hours to obtain magnetic particles wrapped by hydrophilic polymers (or core-shell composite particles of polyoxyethylene-wrapped carbonyl iron), and the inner core is carbonyl iron , the intermediate transition layer is γ-Fe 2 o 3 , the shell layer is polyoxyethylene, and the particle size of the magnetic metal carbonyl iron powder is 0.1-10.0 μm. The TEM photos confirm that the surface...

example 2

[0025] Carbonyl-Al 2 o 3Add 84.0g of powder core-shell composite particles, 1.0mL of aluminum ethoxide, and 100mL of N,N-dimethylformamide of 0.04mol / L trimethoxy-ω-methoxypolyoxyethylene propylsilane into a three-necked flask After stirring at high speed for 20 minutes to make them fully mixed, adjust the pH value of the system to 12.0 by slowly adding 20ml of 1.0mol / L ammonia water dropwise while stirring, and then stir for 36 hours under the condition of 500r / min. Finally, magnetic separation, Washing with deionized water was repeated three times, and the solid was collected and dried in vacuum at 80° C. for 8 hours to obtain polyoxyethylene-coated carbonyl-iron-nickel alloy core-shell composite particles (ie, hydrophilic polymer-coated magnetic particles). The polyoxyethylene-wrapped carbonyl-iron-nickel alloy core-shell composite particles have good compatibility with water. According to the volume ratio, 35 parts of polyoxyethylene-wrapped carbonyl iron-nickel alloy cor...

example 3

[0027] 78.0 g of iron-cobalt-nickel alloy particles with an average particle size of 5 microns, 4.0 mL of ethyl silicate, and 0.04 mol / L trimethoxy-ω-ethoxypolyoxyethylene propyl silane, Add 200mL of N-dimethylformamide into the three-necked flask, stir at high speed for 20min to make them fully mixed, then adjust the pH of the system to 8.5 by slowly adding 1.0mol / L ammonia water 15ml dropwise while stirring, and then Stirring for 72 hours under certain conditions, and finally, magnetic separation, deionized water washing, repeated 3 times, and collected solids at 70 ° C for 10 hours of vacuum drying, that is, polyoxyethylene-wrapped iron-cobalt-nickel alloy core-shell composite particles (i.e. Magnetic particles coated with hydrophilic polymer). The core-shell composite particle of polyoxyethylene-wrapped iron-cobalt-nickel alloy has good compatibility with water. According to the volume ratio, 90 parts of water, 1.5 parts of cellulose sodium carboxylate powder, and 0.5 part...

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PUM

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Abstract

The invention relates to suspended particles for water-based magnetorheological fluids and a manufacturing method thereof. The magnetic particle wrapped by hydrophilic polymer, the surface of the magnetic metal is coated with an inorganic oxide layer, which is characterized in that: the inorganic oxide layer is coated with a hydrophilic polymer layer with an alkoxy silicon at the end. Its preparation method, according to the ratio of substances, 100 parts of magnetic metal composite particles coated with inorganic oxides on the surface, 0.1 to 5.0 parts of alkoxy metal compound, and a hydrophilic polymer with an alkoxy silicon at the end 0.05 to 5.0 parts are fully dispersed in 50-10000 parts of N,N-dimethylformamide solvent, while stirring, add lye dropwise to adjust the pH value of the system, use magnetic separation and water washing to purify and collect the solid, and dry After obtaining the product. The invention has good oxidation resistance and excellent soft magnetic properties, and its preparation method is convenient and easy.

Description

technical field [0001] The invention belongs to nanomaterials and a manufacturing method thereof, in particular to suspended particles used in water-based magnetorheological fluids and a manufacturing method thereof. Background technique [0002] Magnetorheological (MR) fluids, similar to electrorheological fluids, are an important class of artificial intelligence materials, which can perform controllable, reversible and continuous rapid transitions between the properties of liquids and solids, and can be widely used in aerospace, large-scale fields such as civil engineering, automotive engineering, machining and mechatronics. However, the former has advantages over the latter in many application fields due to its low selectivity to carrier liquid, the need not to apply a high-voltage electric field, and the field-induced yield stress generally produced is high. The MR fluid is usually composed of magnetic particles dispersed in the carrier fluid, and sometimes includes som...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C3/10C10M125/10C10N40/14
Inventor 官建国李立春陶剑青程海斌张清杰袁润章
Owner WUHAN UNIV OF TECH
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