Refrigerating machine oil and working fluid composition for refrigerator

A technology of refrigerating machine oil and composition, which is applied in the direction of lubricating composition, petroleum industry, chemical instruments and methods, etc., and can solve problems such as poor lubrication, capillary blockage, etc.

Active Publication Date: 2011-09-21
JX NIPPON OIL & ENERGY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when conventionally used refrigeration oil for HFC refrigerants is used together with difluoromethane refrigerant, sufficient compatibility between the refrigerant and the refrigeration oil cannot be obtained, and the refrigeration oil discharged from the refrigerant compressor tends to remain in the During the cycle, the result is that the amount of refrigerator oil in the refrigerant compressor decreases, causing poor lubrication, or problems such as blocking capillary tubes and other expansion mechanisms.

Method used

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  • Refrigerating machine oil and working fluid composition for refrigerator
  • Refrigerating machine oil and working fluid composition for refrigerator
  • Refrigerating machine oil and working fluid composition for refrigerator

Examples

Experimental program
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Effect test

Embodiment 1～10 and comparative example 1～11

[0090] In Examples 1 to 10 and Comparative Examples 1 to 11, base oils 1 to 13 and additives 1 to 4 shown below were blended in the composition ratios shown in Table 1 or Table 2, respectively, to prepare sample oils. The properties of each sample oil are shown in Tables 1-4.

[0091] (base oil)

[0092] Base oil 1: Tetraester of pentaerythritol and fatty acid mixture (mixture of 70 mol% 2-methylpentanoic acid and 30 mol% 3,5,5-trimethylhexanoic acid)

[0093] Base oil 2: Tetraester of pentaerythritol and fatty acid mixture (mixture of 30 mol% 2-methylpentanoic acid and 70 mol% 3,5,5-trimethylhexanoic acid)

[0094] Base oil 3: tetraester of pentaerythritol and n-valeric acid

[0095] Base oil 4: Hexaester of dipentaerythritol and n-valeric acid

[0096] Base oil 5: diester of neopentyl glycol and 2-methylpentanoic acid

[0097] Base oil 6: triesters of trimethylolpropane and 2-methylpentanoic acid

[0098] Base oil 7: Tetraester of pentaerythritol and 2-methylpentanoic a...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M105/38C10M169/04C09K5/04C10N40/30
Inventor 泷川克也斋藤正典大城户武
Owner JX NIPPON OIL & ENERGY CORP
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