Refrigerated machine oil composition base oil and refrigerated machine oil composition and composition for refrigeration

The present invention relates to cooling machine oil field, a kind of refrigerated machine oil composition base oil and refrigerated machine oil composition and the composition for refrigeration are disclosed.The base oil contains alkylbenzene oil and Esters oil, and the ratio of 120 DEG C of kinematic viscosity of the base oil and 40 DEG C of kinematic viscosity is 0.23~0.30.By the present invention in that being help to obtain with alkylbenzene oil, viscosity is lower and the base oil of excellent combination property, simultaneously by the way that alkylbenzene oil is cooperateed with use with low viscosity, high viscosity index (HVI) Esters oil, by adjusting the ratio of obtained base oil 120 DEG C of kinematic viscosity and 40 DEG C of kinematic viscosity, it advantageously forms as the temperature rises, the base oil that viscosity will not be reduced excessively.And then in the case where guaranteeing the lower situation of oil low-temperature viscosity, by improving its viscosity-temperature characteristics, to increase the thickness of oil film under high temperature, boundary lubrication and leakproofness is improved, and then improve compression mechanism cold efficiency COP value, be finally reached energy-saving and emission-reduction, protect the purpose of environment.