| 摘要 |
PURPOSE:To provide an electroviscous liq. having excellent stability and electrical response characteristics by mixing an organosilica sol with a non-reactive (modified) silicone oil having a predetermined specific gravity in such proportions that the SiO2 content falls within a particular range. CONSTITUTION:An organosilica sol is mixed with a non-reactive silicone oil (e.g., polydimethylsiloxane) or modified silicone oil (e.g., amino-modified silicone oil) having a specific gravity of 0.9-1.3, thereby producing an electroviscous liq. having an SiO2 content of 5-45wt.%. In order to attain stable and uniform dispersion of SiO2, it is necessary to use a dispersion stabilizer, such as octadecyldimethyl[3-(trimethoxysilyl)propyl]ammonium chloride. The obtd. electroviscous liq. can be used in such a state that it is in direct contact with a rubber-like elastic material, because the electroviscous liq. does not contain any oil, solvent or the like which swells or dissolved the rubber-like elastic material. |
