Non-settling glycol based magnetorheological fluids

一种磁流变流体、二醇的技术，应用在磁性物体、磁性液体、磁性材料等方向，能够解决泡沫等问题，达到低起泡性的效果

Active Publication Date: 2010-07-07
LORD CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this type of fluid is that it produces persistent foam when exposed to vacuum, which is a serious problem for vacuum filling operations commonly employed by engine mount manufacturers

Method used

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  • Non-settling glycol based magnetorheological fluids

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047]

[0048] *Glycol Fluid A comprises a glycol mixture formed from ethylene glycol to propylene glycol in a 70 / 30 ratio with an alkyl alkanolamine additive.

[0049] The formulations described in Examples 1 and 2 yielded fluids that did not develop a clear layer after standing overnight without stirring, but had a thick yogurt-like consistency.

[0050] The fluid flows easily after shaking by hand briefly, and continues to flow easily for at least 10 minutes after agitation.

Embodiment 2

[0052] Table 1: Effect of different types of thickeners

[0053]

Preparation

thickener

specific surface area

(m 2 / g)

24 hours

clear layer

1

Fumed silica-1

200

0

[0054]

Preparation

thickener

specific surface area

(m 2 / g)

24 hours

clear layer

2

Fumed silica-2

150

0

3

Fumed silica-3

380

4

4

colloidal silica

n / a

14

5

Treated Fumed Silica

225

7

6

Treated Fumed Silica

125

24

7

Treated Fumed Silica

100

3

[0055] All formulations described above were prepared with 66% by weight iron carbonyl, 2.45% by weight water, 1.5% by weight thickener and 0.83% by weight sodium chloride as ionic thixotropic additive. The settling properties of the above formulations were checked by allowing them to stand undisturbed for...

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Abstract

A magnetorheological fluid comprising magnetic-responsive particles, a thickener, an ionic thixotropic additive, and a carrier fluid wherein the carrier fluid comprises a glycol- water mixture comprising at least 50 percent by weight of a glycol compound. The thickener is preferably fumed silica and the ionic thixotropic additive is preferably one of sodium nitrite, sodium chloride, sodium acetate, and sodium benzoate.

Description

[0001] Cross references to related patent applications [0002] Pursuant to U.S. Patent Law 35 U.S.C. §119(e), this patent application claims the title "NON-SETTLING GLYCOL BASED MAGNETORHEOLOGICAL FLUIDS" filed on August 1, 2007 Priority to US Provisional Patent Application No. 60 / 953,272, the contents of which are incorporated herein by reference. Background technique [0003] Magneto-rheological fluid is a magnetic field-responsive fluid containing field-polarized particle components and liquid carrier components. Magnetorheological fluids can be used in devices or systems for controlling vibration and / or noise. Magnetorheological fluids have been proposed for controlling damping in various devices such as dampers, bumpers, and elastic mounts. Magnetorheological fluids have also been proposed for controlling pressure and / or torque in brakes, clutches and valves. Magnetorheological fluids are believed to be superior to electrorheological fluids in many applications becaus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/44
CPCH01F1/447
Inventor 丹尼尔·E·巴伯唐纳德·A·尼克松
Owner LORD CORP
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