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Magneto-rheological fluid with good settling agglomeration resistance

A magnetorheological fluid and anti-sedimentation technology, which is applied in the petroleum industry, lubricating compositions, etc., can solve the problems of poor anti-settling effect and increased zero-field viscosity of magnetorheological fluid, and achieve improved anti-settling stability, Effect of high shear stress and high suspension capacity

Inactive Publication Date: 2013-07-24
CHONGQING MATERIALS RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The additives used are generally anionic surfactants. Although these additives have a certain effect on improving the anti-settling and agglomeration of magnetorheological fluids, their anti-settling effects are not good; in addition, adding thixotropic agents can also improve the magnetorheological fluid. Anti-sedimentation and agglomeration, such as silicon dioxide, but when the amount of silicon dioxide added is large, it can effectively prevent sedimentation, and a large amount of silicon dioxide is likely to increase the zero-field viscosity of the magnetorheological fluid and affect the use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Prepare 200ml of magnetorheological fluid with good anti-sedimentation and agglomeration properties according to the following steps: Measure 146ml of silicone oil, 1.5g of lithium stearate, and 1.1g of xanthan gum into a 400ml ball mill jar, stir and mix evenly, add reduced carbonyl iron Powder 390g, mechanically stirred evenly, ultrasonically dispersed in a water bath at 70°C for 20 minutes, then added 8g of organic bentonite and 2g of molybdenum disulfide, dispersed at a high speed of 8000 rpm for 10 minutes with a high-speed emulsifying disperser, and then ball milled with a ball mill After dispersing for 8 hours, the linear speed of the ball mill is not less than 125 m / min, and the magnetorheological fluid with anti-sedimentation and agglomeration is obtained.

[0037] The room temperature zero-field viscosity of the magnetorheological fluid measured by a rotational viscometer is 1500mp.s, and the sedimentation is about 0 after standing for 24 hours, which is very s...

Embodiment 2

[0039] Prepare 200ml of magnetorheological fluid with good anti-sedimentation and agglomeration properties according to the following steps: Measure 150ml of deionized water, 6g of polyethylene glycol, 1.4g of zinc dialkyldithiophosphate, and 0.8g of xanthan gum in 400ml In the ball mill tank, stir and mix evenly, add 390g of phosphide carbonyl iron powder, mechanically stir evenly, ultrasonically disperse in a water bath at 70°C for 20 minutes, then add 6g of inorganic bentonite and 2g of graphite powder, and then use a high-speed emulsifying disperser at 8000 rpm Disperse at a high speed for 10 minutes at a high speed, and then use a ball mill to disperse for 6 hours. The linear speed of the ball mill is not less than 125 m / min to obtain a magnetorheological fluid with anti-sedimentation and agglomeration.

[0040] The magnetorheological fluid is measured by a rotational viscometer at room temperature and has a zero-field viscosity of 1400mp.s. After standing for one month, t...

Embodiment 3

[0042] Prepare 200ml of magnetorheological fluid with good anti-sedimentation and agglomeration properties according to the following steps: Measure 146ml of polya-olefin, 1.5g of lithium stearate, and 2.6g of xanthan gum in a 400ml ball mill jar, stir and mix evenly, add 390g of carbonyl iron phosphide powder, mechanically stirred evenly, ultrasonically dispersed in a 70°C water bath for 20 minutes, then added 8g of organic bentonite and 2g of molybdenum disulfide, and dispersed at a speed of 8000 rpm for 10 minutes with a high-speed emulsifying disperser. Then use a ball mill to disperse for 8 hours, and the linear speed of the ball mill is not less than 125 m / min to obtain a magnetorheological fluid with anti-sedimentation and agglomeration.

[0043] The room temperature zero-field viscosity of the magnetorheological fluid measured by a rotational viscometer is 1500mp.s, and the settlement is about 10% after standing for 3 months without obvious hardening.

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Abstract

The invention relates to magneto-rheological fluid with good settling agglomeration resistance. The magneto-rheological fluid comprises the following ingredients in parts by weight according to 100 volume parts: 125-225 parts of ferromagnetic particles, 30-85 parts of carrier fluid, 0.2-5 parts of xanthan gum, and 0-12.5 parts of additives, wherein the additives are a thixotropic agent, a dispersing agent, an antioxidant and a lubricant when the carrier fluid is water-based; and when the carrier fluid is oil-based, the additives are a thixotropic agent, a dispersing agent, and a lubricant. The magneto-rheological fluid is good in stability within a larger temperature range (minus 18 DEG C-130 DEG C), difficult to settle, and also keeps the original performances, namely high shearing stress and good friction property.

Description

technical field [0001] The invention relates to a magnetorheological fluid, in particular to a magnetorheological fluid with good resistance to sedimentation and agglomeration. Background technique [0002] Magnetorheological fluid (MRF) is a dispersion material composed of ferromagnetic suspension phase, suspension medium and additives. Under an external magnetic field, it has the special property of instantaneously and reversibly transforming from Newtonian fluid to Bingham plastic. At the same time, it also has the characteristics of high yield stress, low energy consumption, and little influence by impurities. It has become a hot spot of research at home and abroad. It is mainly used to manufacture vibration absorbers, dampers, clutches and polishers, and is widely used in aerospace. , medical equipment, construction, automobile and precision manufacturing and other fields. However, when magnetorheological fluid is left for a period of time, it tends to settle. The sep...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M169/04C10M173/02C10N40/14C10N30/04
Inventor 岳恩唐龙罗宋安张平
Owner CHONGQING MATERIALS RES INST
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