Refrigeration lubricants
AssigneeAllied-Signal Inc.
InventorsHillel Magid, Raymond Thomas, Leonard Stiel, John W. Pelava
Life of this patent
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Abstract
Compression refrigeration equipment using tetrafluoroethane as a working fluid employs polyoxyalkylene glycols which are at least difunctional with respect to hydroxyl groups and a molecular weight between 300 and 2000. The mixtures of the glycols with the refrigerant will be miscible in the range from -40.degree. C. to at least + 20.degree. C.
Claims24
A composition for use in compression refrigeration comprising:
- (a) tetrafluoroethane;
- and
- (b) a sufficient amount to provide lubrication of at least one polyoxyalkylene glycol which is at least difunctional with respect to the hydroxyl groups, has a molecular weight between 300 and 2000, a viscosity of about 25-150 centistokes at 37.degree. C., a viscosity index of at least 20 and miscible in combination with (a) in the range between -40.degree. C. and at least +20.degree. C.
A method for improving lubrication in compression refrigeration equipment using tetrafluoroethane as a refrigerant consisting of employing as a lubricant at least one polyalkylene glycol which is at least difunctional with respect to the hydroxyl groups has, a molecular weight between 300 and 2000, a viscosity of about 25-150 centistokes at 37.degree. C., a viscosity index of at least 20 and a miscible range in combination with tetrafluoroethane between -40.degree. C. and at least +20.degree. C.
Dependencies are inferred from the claim text.