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Magnetorheological fluid composition

A technology of magnetic viscous fluid and composition, applied in the direction of magnetic objects, magnetic liquids, magnetic materials, etc., can solve the problem of unsatisfactory

Pending Publication Date: 2020-10-09
SOMAR CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, satisfactory results have not yet been obtained in terms of dispersion stability and fluidity

Method used

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  • Magnetorheological fluid composition
  • Magnetorheological fluid composition
  • Magnetorheological fluid composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～3、 comparative example 1～4

[0076] According to the mass ratio shown in Table 1, various components were put into a beaker, heated at 80° C. for 10 minutes, and stirred at 100 rpm for 1 minute using a homogenizer to manufacture a magnetic viscous fluid composition. 25 ml of the produced magnetic viscous fluid composition was placed in sample bottle No. 7 (manufactured by AS-ONE, 50 ml), and dispersion stability and fluidity were evaluated.

[0077] The relevant evaluation methods will be described in detail later.

[0078] In addition, the raw materials used are as follows.

[0079] (A) Magnetic particles

[0080] (a1) carbonyl iron (spherical particles, D50=8μm)

[0081] (B) Dispersion media

[0082] (b1) polyalkylene glycol (polyalkylene glycol) (dynamic viscosity 30mm 2 / s, 40℃)

[0083] (b2) α olefin (dynamic viscosity 15mm 2 / s, 40℃)

[0084] (C) Viscosity modifier

[0085] (c1) castor oil

[0086] (c2) octadecylamide

[0087] (D) Hollow particles

[0088] (d1) Hollow carbon particles (Ke...

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Abstract

A magnetorheological fluid composition with excellent dispersion stability of magnetic particles and fluidity is provided. The magnetorheological fluid composition comprises magnetic particles, a dispersion medium, a viscosity modifier and hollow particles. The hollow particles preferably have an average primary particle diameter of 5 to 500 nm. The hollow particles are preferably at least one kind selected from a group consisting of carbon particles, silica and crosslinked styrene-acryl. The viscosity modifier is preferably at least one kind selected from a group consisting of castor oil, fatty acid amides, polyolefins and (meth)acrylate esters.

Description

technical field [0001] The invention relates to a magnetic viscous fluid composition. In particular, it relates to a magnetic viscous fluid composition for controlling the frictional force acting between various mechanical devices such as brakes, clutches, vibration preventing devices, dampers of vibration control devices, and the like. Background technique [0002] In general, magnetic viscous fluid is prepared by dispersing magnetizable metal particles such as magnetic particles in a dispersion medium. Magnetic viscous fluid functions as a fluid when there is no magnetic field. On the other hand, when a magnetic field is applied, the magnetic particles are aggregated to increase the viscosity, and have the characteristic of increasing the internal stress. [0003] Since the specific gravity difference between the magnetic particles in the magnetic viscous fluid and the dispersion medium is large, the precipitation of the magnetic particles is easy to occur. Moreover, du...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/44
CPCH01F1/447
Inventor 石崎裕久落合明
Owner SOMAR CORP