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A stable and fast response high yield strength bimodal magnetorheological fluid and its preparation method

A technology of magnetorheological fluid and thixotropic agent, applied in magnetic liquids, magnetic objects, magnetic materials, etc., can solve the problems of poor settlement stability, high yield stress, easy settlement and agglomeration, and achieve short response time and high yield. Strength, low cost effect

Active Publication Date: 2020-08-28
北京科亿国际智能悬架技术有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a stable synthetic oil-based magnetorheological fluid and its preparation method, which overcomes the shortcomings of poor sedimentation stability and easy sedimentation and agglomeration of magnetic particles in synthetic oil. The magnetorheological fluid provided has good Anti-friction and anti-wear performance, anti-oxidation performance, the sediment can be re-dispersed by applying a little current or stirring, and the response speed is fast and the yield stress is very high

Method used

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  • A stable and fast response high yield strength bimodal magnetorheological fluid and its preparation method
  • A stable and fast response high yield strength bimodal magnetorheological fluid and its preparation method
  • A stable and fast response high yield strength bimodal magnetorheological fluid and its preparation method

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preparation example Construction

[0046] According to another aspect of the present invention, the present invention provides a method for preparing a synthetic oil-based compound carrier fluid, comprising: contacting a friction-reducing and anti-wear agent with a synthetic oil to obtain a first suspension; mixing an antioxidant with a second The first suspension is contacted to obtain a second suspension; the thixotropic agent is contacted with the second suspension to obtain a third suspension; the surfactant is contacted with the third suspension to obtain a synthetic oil-based compound carrier liquid.

[0047] According to an embodiment of the present invention, the antifriction and antiwear agent is added to the synthetic oil, and stirred at 40-60 degrees Celsius, preferably at 40-50 degrees Celsius, for 0.5-2 hours to obtain the first suspension.

[0048] According to an embodiment of the present invention, the antioxidant is added to the first suspension, and stirred at 40-60 degrees Celsius, preferably ...

Embodiment 1

[0056] Embodiment 1 provides a high temperature resistant magnetorheological fluid, which is prepared by the following method:

[0057] (1) Add 3.0g (0.5%) molybdenum disulfide (anti-friction and anti-wear agent) to 81g (13.5%) low-viscosity synthetic oil (PAO170), stir at 40°C for 0.5 hours; add 3.0g (0.5% ) organophosphorus compound (antioxidant), stirred and mixed for 1 hour; 6g (1%) organic bentonite (thixotropic agent) was added to the obtained suspension, stirred for 1 hour; then 3.0g (0.5%) alkane Oxythiophosphate (surfactant) was added to the suspension, stirred and mixed at 40° C. for 1 hour to obtain a synthetic oil-based compound carrier fluid.

[0058] (2) 504g (84%) nanometer / micron bimodal carbonyl iron powder (particle diameters are 30nm, 2μm respectively) is added in the ratio of 15:85 to the synthetic oil-based composite carrier liquid, stirred at a high speed of 1000rpm to obtain suspension.

[0059] (3) The above suspension was emulsified at 70° C. for 2 h...

Embodiment 2

[0064] (1) Add 4.2g (0.7%) antifriction and antiwear agent molybdenum disulfide and graphite (1:1) to 45g (7.5%) low-viscosity synthetic oil (PAO168), and stir at 40°C for 0.5 hours; Add 3.0g (0.5%) antioxidant organomolybdenum compound, stir and mix for 1 hour; 6g (1%) thixotropic agent organic bentonite is added in the obtained suspension, stir for 1 hour; then 4.8g (0.8% ) Surfactant alkoxythiophosphate was added to the suspension, stirred and mixed at 40° C. for 1 hour to obtain a synthetic oil-based compound carrier fluid.

[0065] (2) Add 537g (89.5%) nano / micro bimodal carbonyl iron powder (particle diameters are 200nm and 3μm respectively) into the synthetic oil-based composite base fluid at a ratio of 10:90, and stir at a high speed of 1000rpm evenly.

[0066] (3) The above suspension was emulsified at a temperature of 70° C. for 2 hours to prepare a magnetorheological fluid, which was denoted as MRF2.

[0067] Put the magnetorheological fluid prepared in this exampl...

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Abstract

The invention belongs to the field of intelligent materials and relates to a magnetorheological fluid with quick response and high yield strength and soft settlement and a preparation method thereof.The magnetorheological fluid provided by the invention comprises: composite magnetic particles, wherein the composite magnetic particles comprise bimodal carbonyl iron powder with different particle diameters, and the particle diameters of the bimodal carbonyl iron powder with different particle diameters differ by 3 to 300 times; A synthetic oil-based compound carry liquid is added with antifriction and antiwear agent, thixotropic agent, antioxidant and surfactant. A method for preparing a magnetorheological fluid is also provided, comprising stirring a composite magnetic particle and the synthetic oil-based composite carrier fluid, performing emulsifying, and obtaining the magnetorheological fluid. The magnetorheological fluid provided by the invention has a yield strength greater than 80 MPa, short response time and low settlement rate, and is suitable for aerospace, aircraft carrier, automobile engineering and mechanical engineering, especially in the field of strong impact resistance.

Description

technical field [0001] The invention belongs to the field of intelligent materials, and in particular relates to a magnetorheological fluid with rapid response, high yield and mild soft settlement, a preparation method and application thereof. Background technique [0002] MRFs (Magneto-rheological fluids, magnetorheological fluids, referred to as MRFs) is a kind of intelligent material whose performance can be adjusted by magnetic field, which is prepared by dispersing soft magnetic particles in a base carrier liquid according to a certain proportion. The mechanical properties of MRFs materials (mainly viscosity and yield stress, etc.) can be controlled rapidly, accurately, continuously and reversibly in real time by applying an external magnetic field. Therefore, it has broad application prospects in the fields of aerospace, machinery manufacturing, transmissions (clutches, brakes, etc.), polishing devices, and intelligent structures. Sedimentation stability is one of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/44
CPCH01F1/447
Inventor 危银涛张焕康振冉韩晓东冯占宗陈亚龙杜永昌李雪冰何一超梁冠群邬明宇童汝亭
Owner 北京科亿国际智能悬架技术有限公司
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