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We report the preparation of a high-performance magnetorheological (MR) fluid by using silane coupling agent and bentonite as additives at appropriate contents determined by a series of experiments. We also adopted a new preparation process that was optimized through an orthogonal experimental design. The effects of process parameters on the sedimentation stability of the MR fluid were determined. Sedimentation ratio, apparent viscosity, and yield stress were measured to evaluate the performance of the MR fluid prepared by the optimized process. Results indicated that the MR fluid exhibited enhanced sedimentation stability when the silane coupling agent and bentonite mass fractions were 2.88% and 3.60%, respectively. Moreover, the effect of the second stirring process on sedimentation stability was found to be more important than the first. The optimal preparation parameters determined for the high-performance MR fluid are as follows: first and second stirring temperature of 20°C, first stirring time of 5...

To obtain high-performance magnetorheological fluid, first, the effectiveness of single surfactant including oleic acid, sodium dodecyl benzene sulfonate, OP4 emulsifier and Tween80 are analyzed by testing the sedimentation stability and viscosity. And then, according to the research results, a novel preparation process, that is the compounding of different surfactants, is proposed. Finally, the effect of surfactants compounding type and content on the properties of magnetorheological fluid are also researched. It is found that the properties of MR fluids can be improved effectively by compounding of oleic acid and sodium dodecyl benzene sulfonate, and the most appropriate compounding content relationship is 4.0 g: 4.0 g.