Magnetorheological fluid comprising macromolecular composite magnetic powder and preparation method thereof

A composite magnetic and magnetorheological fluid technology, applied in the direction of lubricating compositions, etc., can solve the problems of magnetorheological fluids such as easy sedimentation, and achieve low equipment requirements, wide range of zero-field viscosity and saturated shear viscosity, and simple operation Effect

Active Publication Date: 2014-07-02
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is the defect that magnetorheological fluid is easy to settle

Method used

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  • Magnetorheological fluid comprising macromolecular composite magnetic powder and preparation method thereof
  • Magnetorheological fluid comprising macromolecular composite magnetic powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Under stirring conditions, dissolve 1g of polyethersulfone in 20g of N,N-dimethylformamide, stir up the liquid with a pick knife after 12 hours, and drop the liquid into drops to obtain a polyethersulfone solution; under stirring conditions Next, 10g of iron powder is added to the polyethersulfone solution, and the stirring rate is 2000r / min to suspend it; then, the polyethersulfone is evenly coated on the surface of the magnetic powder by solvent evaporation and drying, and the obtained The composite magnetic powder coated with polyethersulfone was washed and filtered with distilled water and absolute ethanol for 3 times, and subjected to magnetic field separation; vacuum-dried at 50°C for 24 hours, and ground to obtain polyethersulfone composite magnetic powder;

[0029] (2) Add 0.1g of nano-silica with a particle size of 15±5nm to 6g of silicone oil with a viscosity of 100±8mPa·s and stir for 2 hours to fully disperse it into the silicone oil with a viscosity of 1...

Embodiment 2

[0032] (1) Replace 1g polyethersulfone with 1g polyarylethersulfone, replace 5g iron powder with 5g carbonyl iron powder, replace 20g N,N-dimethylformamide with 30g chloroform, stir at 3000r / min, repeat Example 1 (1) to obtain polyarylethersulfone composite magnetic powder;

[0033] (2) Add 0.1g of nano-silica with a particle size of 15±5nm to 6g of silicone oil with a viscosity of 100±8mPa·s and stir for 2 hours to fully disperse it into the silicone oil with a viscosity of 100±8mPa·s. The higher the stirring rate, the better, to obtain a mixed carrier liquid; add the 4g polyarylether sulfone composite magnetic powder to the mixed carrier liquid, ultrasonically disperse for 6 hours and then stir for 12 hours to obtain a polyarylether sulfone composite magnetic powder Body magnetorheological fluid.

Embodiment 3

[0035] (1) Replace 1g polyethersulfone with 2g polyetherimide, replace 20g N,N-dimethylformamide with 40g N,N-dimethylformamide, replace 10g iron powder with 4g ferric oxide, The stirring rate was 2500r / min, and (1) in Example 1 was repeated to obtain polyetherimide composite magnetic powder;

[0036] (2) Add 0.05g of nano-silica with a particle size of 15±5nm to 6g of silicone oil with a viscosity of 100±8mPa·s and stir for 2 hours to fully disperse it into the silicone oil with a viscosity of 100±8mPa·s. The higher the stirring rate, the better, to obtain a mixed carrier liquid; add the 4g polyetherimide composite magnetic powder into the mixed carrier liquid, ultrasonically disperse for 6 hours, and then stir for 12 hours to obtain a polyetherimide composite magnetic powder. Magnetorheological fluid for magnetic powder.

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Abstract

The invention provides magnetorheological fluid comprising macromolecular composite magnetic powder and a preparation method thereof, and belongs to the technical field of magnetic materials and functional materials. The magnetorheological fluid comprises the composite magnetic powder, carrier liquid and a thixotropic agent, wherein the composite magnetic powder is the magnetic powder coated with polyether sulphone macromolecules. The preparation method of the magnetorheological fluid comprises the following preparation steps: firstly preparing the composite magnetic powder by using a solvent evaporation drying method, then mixing the carrier liquid and the thixotropic agent by stirring, adding the composite magnetic powder, and preparing the uniformly dispersed magnetorheological fluid comprising the special engineering macromolecular composite magnetic powder by ultrasound and stirring. The preparation method of the magnetorheological fluid system is simple and convenient for large-scale production; and the special engineering macromolecules are used as coating materials of the ferromagnetic powder; the problems of sedimentation and oil resistance are solved; and the magnetorheological effect of the system is maintained at a very high level.

Description

technical field [0001] The invention belongs to the technical field of magnetic materials and functional materials, and in particular relates to a magnetorheological fluid of polyaryl ether sulfone polymer composite magnetic powder and a preparation method thereof. Background technique [0002] Among smart materials, magnetorheological fluid (Magnetorheological Fluid, MRF) has been widely valued for its unique magnetorheological effect (Magnetorheological Effect). As a new type of intelligent material, magnetorheological fluid has the advantages that traditional materials do not have, such as fast change response speed, good continuity, high efficiency and high safety and reliability. It is used in vibrators, brakes, hydraulic devices, sealing and polishing Devices and other fields have very strong market potential. [0003] Magnetorheological fluids are generally composed of dispersed particles or suspended particles, base liquid or dispersion medium, additives or stabiliz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M169/04C10M177/00C10M171/00
Inventor 关绍巍纪凡刚崔建国
Owner JILIN UNIV
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