BASE OIL FOR COOLING DEVICE, DEVICE-COOLING OIL CONTAINING THE BASE OIL, DEVICE TO BE COOLED BY THE COOLING OIL, AND DEVICE COOLING METHOD USING THE COOLING OIL

摘要

PROBLEM TO BE SOLVED: To provide a base oil for cooling a device having excellent electric insulation properties and heat conductivity, to provide a device-cooling oil containing the base oil, to provide a device to be cooled by the cooling oil and to provide a device cooling method using the cooling oil. SOLUTION: The base oil for cooling a device contains≥30 mass% at least either one of an aliphatic monoester and an aliphatic monoether, wherein each of the aliphatic monoester and the aliphatic monoether has a terminal methyl group, a methylene group and an ether group in the total number of 18 or more in the main chain thereof, the total number of methyl branches and ethyl branches in the aliphatic monoester and the aliphatic monoether is 2 or less and kinematic viscosity of the base oil is 4 to 30 mm2/s at 40°C. Since the device-cooling oil containing the base oil has excellent electric insulation properties and thermal conductivity, the device-cooling oil is suitable for cooling a motor, a battery, an inverter, an engine, an electric cell or the like of an electric-powered car, a hybrid car or the like. COPYRIGHT: (C)2011,JPO&INPIT