| 摘要 |
PURPOSE:To obtain an electroviscous fluid improved in the Winslow effect by dispersing silica particles obtained by substituting water adsorbed on the surfaces of wet silica particles with an organic compound containing a nitrile group in an electrial insulating liquid. CONSTITUTION:An electroviscous fluid is prepared by dispersing in an electrical insulating liquid 0.1-50wt.% silica particles obtained by substituting water adsorbed on the surfaces of wet silica particles with a nitrile compound. The average particle size of the wet silica particles is preferably 10-500mum. As the electrical insulating liquid, a silicone oil is desirable. In particular, diorganopolysiloxane containing a fluoroalkyl group is desirable since it can help the Winslow effect to be manifested more successfully and can prevent sedimentation of the particles due to a difference in specific gravity. Examples of the organic compound include acetonitrile, propionitrile, benzonitrile and alpha-tolunitrile. |
