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MAGNETORHEOLOGICAL FLUID WITH IMPROVED REDISPERSIBILITY AND METHOD FOR EVALUATING REDISPERSIBILITY OF MAGNETORHEOLOGICAL FLUID
MAGNETORHEOLOGICAL FLUID WITH IMPROVED REDISPERSIBILITY AND METHOD FOR EVALUATING REDISPERSIBILITY OF MAGNETORHEOLOGICAL FLUID
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机译:具有改善的可磁化性的磁流变流体和评估磁流变流体的可吸收性的方法
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摘要
Disclosed are a magnetorheological fluid and a method for evaluating re-dispersibility of a magnetorheological fluid. According to the present invention, a magnetorheological fluid comprising magnetic particles, a dispersing medium, and an additive, wherein, when all solid components in the magnetorheological fluid are recovered to measure particle size distribution and to obtain a span value (span value) defined below: span value = (D90 - D10) / D50, wherein D90, D10 and D50 respectively indicate particle sizes corresponding to 90 %, 10 %, and 50 % of the maximum value in a cumulative distribution of particle sizes of solid components, and the span value is 1.3 or more.;According to the present invention, a method for evaluating re-dispersibility of a magnetorheological fluid includes providing a transparent container containing a magnetorheological fluid; measuring an amount of light that pass through the transparent container by irradiating near-infrared rays while rotating the transparent container by a centrifuge (primary dispersion stability measurement); re-dispersing the centrifuged solid components into the dispersing medium by applying an external force to the magnetorheological fluid; and measuring an amount of light that pass through the transparent container by irradiating near-infrared rays while re-rotating the transparent container containing a magnetorheological fluid in which the solid components are re-dispersed by the centrifuge (secondary dispersion stability measurement).
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