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Magnetorheological fluid

A technology of magnetorheological fluid and carbonyl iron powder, which is applied in the petroleum industry, lubricating compositions, etc., can solve the problems of not optimal shear yield stress and not optimal adjustability of shear yield stress, etc., and achieve good resistance Settling and anti-agglomeration properties, improved stability, and improved shear yield stress effects

Inactive Publication Date: 2013-09-04
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Magnetorheological fluids using nano-sized magnetic particles or micron-sized magnetic particles alone have suboptimal shear yield stress of magnetorheological fluids and poor adjustability of shear yield stress relative to zero-field viscosity Reality

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Mix 225 grams of surface-treated micron-scale carbonyl iron powder and 45 grams of nano-scale carbonyl iron powder, add the mixed carbonyl iron powder to 33.75 grams of methyl silicone oil, stir for 2 hours; then add 6.75 grams of surfactant N , N'-sodium diethylsulfonate, stirred for 1h; then added 6.75 grams of dispersant oleic acid, stirred for 1 hour; then added 6.75 grams of solid lubricant graphite, stirred for 2 hours; then added 6.75 grams of thixotropic agent organic bentonite, stirred 2h; finally add 6.75 grams of antioxidant dibutylhydroxytoluene, stir for 2h; put the stirred mixture into a ball mill and stir for 4h to obtain the magnetorheological fluid of the present invention, each component in the obtained magnetorheological fluid The weight percentage is: mixed carbonyl iron powder 80%, carrier liquid 10%, N, N'-sodium diethylsulfonate 2%, oleic acid 2%, graphite 2%, organic bentonite 2%, dibutyl hydroxytoluene 2%.

[0025] After standing for 1 year, th...

Embodiment 2

[0027] Mix 220 grams of surface-treated micron-scale carbonyl iron powder and 11 grams of nano-scale carbonyl iron powder, add the mixed carbonyl iron powder to 184.8 grams of vegetable oil, stir for 2 hours, and then add 9.24 grams of surfactant N, N '-Sodium diethylsulfonate, stirred for 1 hour; then added 9.24 grams of dispersant oleic acid, stirred for 1 hour; then added 9.24 grams of solid lubricant graphite, stirred for 2 hours; then added 9.24 grams of thixotropic agent organic bentonite, stirred for 2 hours Finally, add 9.24 grams of antioxidant dibutyl hydroxytoluene, stir for 2h; put the mixed material that has been stirred into a ball mill and stir for 4h to obtain the magnetorheological fluid of the present invention. The weight percentage is: mixed carbonyl iron powder 50%, carrier liquid 40%, N, N'-sodium diethylsulfonate 2%, oleic acid 2%, graphite 2%, organic bentonite 2%, dibutylhydroxytoluene 2% %.

[0028] After standing for one year, the magnetorheological...

Embodiment 3

[0030] Mix 350 grams of surface-treated micron-scale carbonyl iron powder and 70 grams of nano-scale carbonyl iron powder, add the mixed carbonyl iron powder to 165 grams of vegetable oil, stir for 2 hours, and then add 3 grams of surfactant N, N '-Sodium diethylsulfonate, stirred for 1 hour; then added 3 grams of dispersant oleic acid, stirred for 1 hour; then added 3 grams of solid lubricant graphite, stirred for 2 hours; then added 3 grams of thixotropic agent organic bentonite, stirred for 2 hours Finally, add 3 grams of antioxidant dibutyl hydroxytoluene, stir for 2h; put the mixed material that has been stirred into a ball mill and stir for 4h to obtain the magnetorheological fluid of the present invention. The weight percentage is: mixed carbonyl iron powder 70%, carrier liquid 27.5%, N, N'-sodium diethylsulfonate 0.5%, oleic acid 0.5%, graphite 0.5%, organic bentonite 0.5%, dibutylhydroxytoluene 0.5% %.

[0031] After standing for 1 year, the magnetorheological fluid ...

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Abstract

The invention discloses a high-performance magnetorheological fluid which comprises the following components in percentage by weight: 50-80% of mixed carbonyl iron powder, 10-40% of carrier liquid, 0.5-2% of surfactant, 0.5-2% of thixotropic agent, 0.5-2% of antioxidant, 0.5-2% of solid lubricant and 0.5-2% of dispersant. Compared with the prior art, by adding a small amount of nano carbonyl iron powder into micron carbonyl iron powder, the invention can obviously improve the sedimentation stability of the magnetorheological fluid and can improve the shear yield stress of the magnetorheological fluid under a magnetic field. After standing for 1 year, the magnetorheological fluid can still show favorable sedimentation resistance and aggregation resistance. The magnetorheological fluid disclosed by the invention can be widely used in the fields of aerospace, machinery, intelligent vibration damping of vehicles or civil building structures.

Description

technical field [0001] The invention relates to a high-performance magnetorheological fluid. Background technique [0002] Magnetorheological fluid is a new kind of smart material, which is a non-colloidal suspension liquid with controllable rheological characteristics as the external magnetic field changes. Magneto-rheological dampers, which are widely used in engineering, are made by making full use of the adjustable intelligent characteristics of magnetorheological fluids, so the performance of magnetorheological fluids directly affects the performance of dampers. [0003] The main problems of magnetorheological fluids at present are the sedimentation and stability problems caused by the long-term standing and the large specific gravity difference between the media. , but the effect is often not very good. Existing experiments have shown that the rheological activity of magnetorheological fluid is directly related to the concentration of magnetic particles. The higher t...

Claims

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Application Information

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IPC IPC(8): C10M169/04C10N20/06
Inventor 徐赵东郭维阳张香成陈兵兵
Owner SOUTHEAST UNIV
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