| 摘要 |
PURPOSE:To increase the shearing force when an external voltage is applied at high temp. and reduce the consumption of electricity by dispersing fine particles of a specified dielectric in an electrically insulating oily liq. CONSTITUTION:A particulate dielectric is prepd, by coating the surface of a spherical or ellipsoidal polymeric substance having ionically dissociating groups, a particle size of 1-200mum and a water content of 0.05-20wt.% (e.g. strongly acidic ion exchange resin of styrene-divinylbenzene-sulfonic acid type) with an electrically insulating thin film having a volume resistivity or surface resistivity of 10<6> OMEGA.cm or above and a thickness of 2mum or below. Then, 1-60vol.% this dielectric is dispersed in 99-40vol.% electrically insulating oily liq. (e.g. chlorodiphenyl). |
