Refrigeration lubricant blends
AssigneeAllied-Signal Inc.
InventorsRaymond H. P. Thomas, Hillel Magid, David P. Wilson, John W. Pelava
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Abstract
The present invention provides a lubricating composition. The composition comprises a single phase blend of (i) at least one polyoxyalkylene glycol which has a molecular weight between 300 and 2000, a viscosity of about 10-157 centistokes at 37.degree. C., and a viscosity index of at least 20 and (ii) a chlorotrifluoroethylene oil having a viscosity of about 0.8-1000 centistokes at 25.degree. C. The blend is miscible in combination with the tetrafluoroethane in the range between 0.degree. C. and at least +5.degree. C.
Claims22
A lubricating composition comprising a single phase blend of (i) at least one polyoxyalkylene glycol which has a molecular weight between 300 and 2000, a viscosity of about 10-157 centistokes at 37.degree. C. and a viscosity index of at least 20 and (ii) a chlorotrifluoroethylene oil having a viscosity of about 0.8-1000 centistokes at 25.degree. C. wherein said blend is miscible in combination with tetrafluoroethane in the range of 0.degree. C. to at least +5.degree. C.
A composition for use in compression refrigeration comprising:
- (a) tetrafluoroethane;
- and
- (b) a sufficient amount to provide lubrication of a single phase blend of (i) at least one polyoxyalkylene glycol which has a molecular weight between 300 and 2000, a viscosity of about 10-157 centistokes at 37.degree. C., and a viscosity index of at least 20 and (ii) a chlorotrifluoroethylene oil having a viscosity of about 0.8-1000 centistokes at 25.degree. C. wherein said blend is miscible in combination with said tetrafluoroethane in the range between 0.degree. C. and at least +5.degree. C. and said composition has a viscosity of about 60 to about 120 centistokes at 37.degree. C.
A method for improving lubrication in compression refrigeration equipment using tetrafluoroethane as a refrigerant consisting of employing as a lubricant a single phase blend of (i) at least one polyalkylene glycol which has a molecular weight between 300 and 2000, a viscosity of about 10-157 centistokes at 37.degree. C., and a viscosity index of at least 20 and (ii) a chlorotrifluoroethylene oil having a viscosity of about 0.8 to about 1000 centistokes at 25.degree. C. wherein said blend is miscible in combination with said tetrafluoroethane in the range between 0.degree. C. and at least +5.degree. C.
Dependencies are inferred from the claim text.