| 摘要 |
PURPOSE: To obtain a lubricating fluid compsn. which is used for a dynamic pressure bearing and excellent in magnetic sealing properties, lubricity, low volatility. and high-temp. resistance by adding a specific substance to a compsn. comprising a base oil solvent and magnetic particles dispersed therein. CONSTITUTION: A lubricating fluid compsn. used as a lubricating fluid for a dynamic pressure bearing, which supports a shaft by dynamic pressure, is prepd. by dispersing magnetic particles (e.g. fine Mn-Zn ferrite particles) in a base oil solvent (e.g. a mixture of a hydrogenated poly-α-olefin, a polycarbonate, a diisodecyl adipate oil, and a trioctyl trimellitate oil). Pref. 0.5wt.% or higher, still pref. 1-5wt.%, amine-based gelation inhibitor (e.g. an alkyldiphenylamine), which is an amine-based antioxidant, is added to the base oil solvent in preparing the compsn. |
