| 摘要 |
PURPOSE:To obtain the title compsn. which has excellent long-term usage stability, by adding a particular S (compd.) to a polyorganosiloxane fluid. CONSTITUTION:90-99.99wt.% polyorganosiloxane fluid (A), as a base oil, represented by formula I (wherein R1 is a monovalent hydrocarbon or halogenated hydrocarbon residue; and a is 1.9-2.1) and having a viscosity (25 deg.C) of 500-500,000cSt is blended with 0.01-10wt.% at least one S (compd.) (B) selected from a hydrocarbon sulfide (a) of formula II (wherein R2 is a monovalent hydrocarbon residue; R<3> is a divalent hydrocarbon residue; x is 1 or greater; and n is 0 or greater), a fat or oil sulfide (b) which is a reaction product of a fat or oil and S, a zinc dithiophosphate (c) of formula III (wherein R4-R7 are each R2), a metal salt (d) of a dialkyldithiocarbamic acid or formula IV (wherein R8-R11 are each an alkyl; and Me is a metal selected from Zn, Pb, Mo and Sb), S per se (e) and a hydrocarbon sulfide (f) of formula V (wherein R12 and R13 are each R3), optionally together with a heat resistance improver and any other additive (C). |
