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Additive for magnetorheological fluids

A technology of magnetorheological fluids and additives, applied in the direction of additives, magnetic objects, magnetic liquids, etc., can solve problems such as sedimentation, particle wear, and limited material usable temperature range

Active Publication Date: 2018-10-23
LORD CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These surfactants often contain small amounts of water, which can limit the usable temperature range of the material
[0009] In addition to particle settling, another limitation of fluids is the tendency of particles to cause wear as they come into moving contact with the surfaces of various components
Unfortunately, friction-reducing additives in MR fluids tend to make settling worse, often resulting in a "hard-pack" of settled particles on the chamber bottom

Method used

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  • Additive for magnetorheological fluids
  • Additive for magnetorheological fluids
  • Additive for magnetorheological fluids

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Example 1 - Effect of oleic acid amine salt in MR fluid

[0060] fluid preparation :

[0061] In these examples, a polyalphaolefin / dioctyl sebacate (PAO / DOS) carrier fluid, Duomeen TDO friction reducer, and organic molybdenum and sulfur The phosphorous additive was mixed for about 10 to 15 minutes to prepare the MR fluid.

[0062] When the additive is sufficiently incorporated into the carrier fluid, the organoclay is added and the mixture is mixed using the disperser blade for about 15 minutes. The carbonyl iron is then added to the system a little at a time until it is wetted and incorporated. The whole mixture was then milled for an additional 15 minutes. The final MR fluid contained a solids concentration of about 26% by volume and about 0.58% by weight Duomeen TDO.

[0063] Viscosity test :

[0064] All experiments were performed using an ARES-G2 rheometer with parallel plate geometry. The environmental chamber was filled with liquid nitrogen, and the sam...

Embodiment 2

[0076] Example 2 - Effect of Ultrafine Molybdenum Disulfide

[0077] Additives for magnetorheological (MR) fluids that provide improved friction properties typically cause an increase in the transparent layer of the fluid over time. This is due to the reduced friction between the fluids allowing solids to settle to the bottom of the fluid chamber when the fluid is not in use. A transparent top layer becomes visible as the particles settle into a dense bottom layer. Therefore, measurement of the clear layer is one method for determining the effectiveness of anti-settling agents in MR fluids. Another indicator is to measure the viscosity at certain points throughout the MR fluid column.

[0078] fluid preparation :

[0079] In these examples, a polyalphaolefin / dioctyl sebacate (PAO / DOS) carrier fluid, about 0.6 wt. % Duomeen TDO and about 3.6 wt. % molybdenum disulfide (when used) and other additives were mixed for about 10 to 15 minutes to prepare the MR fluid.

[0080] ...

Embodiment 3

[0102] Example 3 - Alternative Amines

[0103] Two base fluids were prepared according to the invention, the first fluid "787 Fluid" contained PAO2.5 / DOS base fluid and Molyvan 855, while the second fluid "690 Fluid" did not contain Molyvan 855 but contained 3.6% by weight super Fine MDS powder. The content of various amine additives was about 0.6% by weight, and the friction and viscosity at a certain temperature were measured. The following additives were evaluated: Tertrameen T (linear tetraamine); Triameen T (linear triamine); Duomeen T (linear diamine); Armolube 312, Duomeen TDO and Armolube 211 (the oleic acid amine salt described herein ); and Ethomeen T15 (ethoxylated amine).

[0104] As shown in Tables 2 and 3 below, the amine oleate salts of the present invention exhibit minimal friction and viscosity, especially when the temperature is reduced. It is worth noting that while the ethoxylated amine (Ethomeen T15) exhibited reasonably good low temperature viscosity, ...

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Abstract

A magnetorheological fluid is provided having a reduced coefficient of friction and favorable settling characteristics. The fluid contains magnetically responsive particles, a carrier fluid, and an amine oleate salt.

Description

[0001] Cross References to Related Applications [0002] Pursuant to 35 U.S.C. §119(e), this application claims U.S. Provisional Patent Serial No. 62 / 301,008, filed February 29, 2016, entitled "Additive for Magnetorheological Fluids" application and U.S. Provisional Patent Application Serial No. 62 / 407,569, filed October 13, 2016, entitled "Additive for Magnetorheological Fluids," the disclosure of which is available through Incorporated herein by reference. technical field [0003] The present invention relates to a magnetorheological fluid composition having reduced friction and improved low temperature viscosity properties. More particularly, the present invention relates to a magnetorheological fluid composition comprising an oleic acid amine salt additive, and optionally molybdenum disulfide particles complementary to conventional magnetorheological fluid additives. Background technique [0004] Magnetorheological fluids are fluid compositions whose apparent viscosity...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/44C10M171/00C10N30/02C10N30/06C10N40/14
CPCC10M171/001H01F1/447C10M2201/066C10M2205/0285C10M2207/126C10M2207/282C10M2215/02C10M2219/068C10M2223/045C10M2223/047C10N2010/14C10N2010/12C10N2020/06C10N2030/02C10N2030/06C10N2040/185C10N2010/16C10N2030/60C10M105/36C10M107/02C10M111/04C10M125/22C10M133/54C10M137/00C10M139/06C10M141/12C10M169/04C10M2205/0206C10M2207/2825C10M2215/26C10M2223/00C10M2227/08
Inventor 约瑟夫·福尔克
Owner LORD CORP
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