Refrigerating machine oil and working fluid composition for refrigerator

Abstract

The invention discloses refrigerating machine oil and a working fluid composition for a refrigerator. The refrigerating machine oil of the invention contains ester which is above 10% of the total amount of the refrigerating machine oil by weight and used together with difluoromethane refrigerating medium. The ester is ester of pentaerythritol and fatty acid. Wherein in the fatty acid, the mol ratio of fatty acid with a branched chain and whose carbon atom number is 6 to 3,5,5-trimethyl caproic acid is (20:80)-(80:20); the sum of the fatty acid whose carbon atom number is 6 and the 3,5,5-trimethyl caproic acid is above 20 mol% in the fatty acid; furthermore, the working fluid composition for the refrigerator contains the refrigerating machine oil and the difluoromethane refrigerating medium in the invention.

Description

technical field [0001] The present invention relates to a refrigerating machine oil and a working fluid composition for refrigerating machines. Specifically, it relates to a refrigerating machine oil useful when used together with difluoromethane refrigerant (HFC-32), and a refrigerating machine using the refrigerating machine oil. Machine working fluid composition. Background technique [0002] Due to the problem of ozone depletion in recent years, CFC (chlorofluorocarbons) and HCFCs (hydrochlorofluorocarbons), which have been used as refrigerants for refrigeration equipment, have become restricted objects, and instead of them, HFCs (hydrofluorocarbons) are gradually used as Refrigerant. [0003] When CFC and HCFC are used as refrigerants, hydrocarbon oils such as mineral oil and alkylbenzene can be appropriately used as refrigerating machine oils. Compatibility, lubricity, solution viscosity with refrigerants, thermal / chemical stability, and other unexpected behaviors re...

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