Base oil of refrigerator oil, refrigerator oil, and work fluid composition for refrigerator

Abstract

The invention relates to the technical field of refrigerating machine oil products, in particular to base oil of refrigerator oil, refrigerator oil containing the base oil and a working fluid composition for a refrigerating machine. The base oil of refrigerator oil is ester synthesized from pentaerythritol and a plurality of fatty acids, the fatty acids comprise a first fatty acid, the first fattyacid is a C5 straight-chain and/or branched-chain monobasic fatty acid; the fatty acids further comprise at least one of a second fatty acid and a third fatty acid, wherein the second fatty acid is aC8-C9 branched-chain monobasic fatty acid, and the third fatty acid is binary fatty acid of C5-C8. The refrigerating machine oil and the working fluid composition for the refrigerating machine provided by the invention can simultaneously consider the intermiscibility, lubricity, thermal stability and/or chemical stability of the refrigerant when the R32 refrigerant is used.

Description

technical field [0001] The present application relates to the technical field of refrigerating machine oil products, in particular, to a refrigerating machine oil base oil, and to refrigerating machine oil and a working fluid composition for refrigerating machine containing the refrigerating machine oil base oil. Background technique [0002] As the ozone layer is depleted, CFC (chlorofluorocarbons) and HCFCs (hydrochlorofluorocarbons), conventionally used as refrigerants for refrigerating machines, are subject to regulation, and HFC (hydrofluorocarbons) refrigerants are replacing them. Among the HFC refrigerants, although HFC-134a, R407C, and R410A refrigerants have an ozone destruction coefficient (ODP) of 0, they have a high global warming coefficient (GWP), and are gradually being restricted. R32 (difluoromethane) refrigerant, as one of the chlorine-free HFCs and one of the candidate refrigerants with low GWP, has attracted the attention of the industry due to its enviro...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is: the refrigerating machine oil widely used as HFC refrigerant is difficult to be compatible with R32 refrigerant, which makes the refrigerating machine oil poor in oil return in the refrigerating system, resulting in a decrease in the amount of refrigerating machine oil inside the compressor and poor lubrication ; and the refrigeration oil with good compatibility with R32 refrigerant, mixed with R32 refrigerant working fluid composition, the viscosity is too small under the high temperature and high pressure working conditions of the refrigerator, resulting in poor lubrication, which increases the wear of the moving parts of the compressor

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