Refrigerator oil
The present invention provides a refrigerating machine oil comprising a hydrocarbon-based base oil having a viscosity index of 120 or less, and the refrigerating machine oil being used with a 1-chloro-2,3,3,3-tetrafluoropropene refrigerant.
1. A refrigerating machine oil comprising a hydrocarbon-based base oil,
the refrigerating machine oil having a viscosity index of −30 to 105, and being used with a 1-chloro-2,3,3,3-tetrafluoropropene refrigerant, wherein
the hydrocarbon-based base oil is at least one paraffinic mineral oil-based hydrocarbon oil,
the hydrocarbon-based base oil has a viscosity index of −30 to 105, a % C P of 63 to 90, and a % C N of 13 to 40, and
an amount of the hydrocarbon-based base oil is 95 mass % or more based on the total amount of refrigerating machine oil.
2. The refrigerating machine oil according to claim 1 , wherein the hydrocarbon-based base oil has
a kinematic viscosity at 40° C. of 20 to 120 mm 2 /s,
a kinematic viscosity at 100° C. of 2 to 12 mm 2 /s,
a % C A of 5 to 30,
a % C N /% C P of 0.2 to 1.5,
a sulfur content of 8000 ppm by mass or less, and
a nitrogen content of 100 ppm by mass or less.
3. The refrigerating machine oil according to claim 1 ,
further comprising at least one additive selected from the group consisting of an acid scavenger, an antioxidant, an extreme-pressure agent, an oiliness agent, an antifoaming agent, a metal deactivator, an antiwear agent, a viscosity index improver, a pour-point depressant, a detergent dispersant, a friction modifier and a rust inhibitor.
4. A working fluid composition for a refrigerating machine comprising:
a refrigerating machine oil comprising a hydrocarbon-based base oil, the refrigerating machine oil having a viscosity index of −30 to 105, and
a 1-chloro-2,3,3,3-tetrafluoropropene refrigerant,
wherein
the hydrocarbon-based base oil is at least one paraffinic mineral oil-based hydrocarbon oil,
the hydrocarbon-based base oil has a viscosity index of −30 to 105, a % C P of 63 to 90, and a % C N of 13 to 40, and
an amount of the hydrocarbon-based base oil is 95 mass % or more based on the total amount of refrigerating machine oil.
5. The working fluid composition for a refrigerating machine according to claim 4 , wherein the hydrocarbon-based base oil has
a kinematic viscosity at 40° C. of 20 to 120 mm 2 /s,
a kinematic viscosity at 100° C. of 2 to 12 mm 2 /s,
a % C A of 5 to 30,
a % C N /% C P of 0.2 to 1.5,
a sulfur content of 8000 ppm by mass or less, and
a nitrogen content of 100 ppm by mass or less.
6. The working fluid composition for a refrigerating machine according to claim 4 , wherein the refrigerating machine oil further comprises at least one additive selected from the group consisting of an acid scavenger, an antioxidant, an extreme-pressure agent, an oiliness agent, an antifoaming agent, a metal deactivator, an antiwear agent, a viscosity index improver, a pour-point depressant, a detergent dispersant, a friction modifier and a rust inhibitor.