| 摘要 |
PURPOSE: To obtain a fluid composition for active suspension having excellent friction-inhibiting property of a sliding part material in a hydraulic pump part and a friction-lowering property in a shock absorber part by including a specific ratio of a phosphorous acid ester, a specific oiliness agent, a thiadiazole and benzotriazoles to a base oil of a lubricating oil. CONSTITUTION: A base oil of a lubricating oil such as a purified paraffin-based mineral oil is mixed with (A) a phosphorous acid ester such as a compound expressed by formula I [R<1> is a 4-22C (branched) alkyl or a 4-22C (branched) alkenyl, etc.; R<2> and R<3> are each H, a 1-22C (branched) alkyl or a 1-22C (branched) alkenyl, etc.], (B) an aliphatic amine-based oiliness agent such as oleylamine, (C) thiadiazole such as a compound expressed by formula II [R<10> is a 1-30C (branched) alkyl; R<11> is H or a 1-30C alkyl; (p) and (q) are each 1-3] and (D) benzotriazole (derivative), and contents of each component to an amount of the whole composition are: A=0.05-10wt.%, B=0.01-5wt.%, C+D=0.01-0.2wt.% and a weight ratio of C/D is 0.5-2.0 to obtain the objective composition. |
