Cooling engine oil for hydrocarbon refrigerant

Abstract

To provide a refrigerating machine oil which has appropriate compatibility with and solubility in a hydrocarbon refrigerant, can maintain a viscosity which does not adversely affect its lubricity, can reduce the filling amount of the refrigerant and, in addition, has excellent lubricity, electrical insulating properties, stability and the like. The refrigerating machine oil for a hydrocarbon refrigerant comprises an ester of one or more kinds of a 5-10C neopentyl polyol with one or more kinds selected from a 5-9C linear or branched monovalent fatty acid as the major component.

Description

technical field [0001] The present invention relates to refrigerating machine oils using hydrocarbons (for example, ethane, propane, butane, isobutane, etc.) as refrigerants. Background technique [0002] Conventionally, in refrigerators, air conditioners, refrigerators, etc., fluorine refrigerants (for example, trichlorofluoromethane (R-11), dichlorodifluoromethane, etc.) that use fluorine and chlorine as constituent elements (R-12), chlorodifluoromethane (R-22) of the chlorofluorocarbon (HCFC) type, etc.) as a refrigerant. However, their production and use have recently been restricted internationally due to their association with the ozone layer depletion problem, and now they are being replaced by, for example, difluoromethane (R-32), tetrafluoroethane (R-134 or R-134a), etc. Chlorine-free, hydrogen-containing fluorine refrigerant replacement. However, although these HFCs do not destroy the ozone layer, they are not excellent refrigerants fr...

AI Technical Summary

Problems solved by technology

[0004] However, due to the high solubility of hydrocarbon refrigerants in lubricants such as mineral oil, the concentration of the lubricant decreases after using the above-mentioned lubricants, and the lubricity cannot be ensured. Moreover, the filling amount of the refrigerant needs to be increased.