| abstract |
(57) [Summary] [Structure] The hydraulic fluid of the present invention comprises a polyolefin alone, Alternatively, a highly viscous polyolefin having a viscosity of 170 to 30,000 cSt at 40 ° C and a viscosity of 5 to 170 cS at 40 ° C. a mixed oil with a low viscosity oil that is t, and further a polyolefin, An oil mixed with a viscosity index improver having a viscosity higher than that of the polyolefin, and having a viscosity at 40 ° C. of 170 to 1000 cSt. [Effect] The hydraulic fluid of the present invention maintains high viscosity, It can be a high-performance hydraulic fluid that can have a high viscosity index and can utilize the low temperature fluidity, wear resistance, and oxidation stability of the synthetic lubricating oil itself. It is suitable as a hydraulic fluid for hinges, torque converters and shock absorbers. |