Lubricating oil compositions for refrigerators
AssigneeNippon Oil Co., Ltd.
InventorsUmekichi Sasaki, Hiroshi Hasegawa
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Abstract
A lubricating oil composition for a refrigerator using therein 1,1,1,2-tetrafluoroethane as the refrigerant, comprising as the base oil a polyoxyalkylene glycol monoether of the following general formula ##STR1## wherein R.sub.1 is an alkyl group having 1-18 carbon atoms, m is an integer of 5-70, R.sub.2 is an alkylene group having 2-4 carbon atoms and a ratio of 0-0.8 between (the number of --OR.sub.2 --group wherein R.sub.2 is ethylene group)/m in the molecule, the polyoxyalkylene glycol monoether having a specified pour point and a specified kinematic viscosity. In one embodiment, the lubricating oil composition may further comprise a specified phosphate and at least one kind of a specified epoxy compound to further improve the oil composition in properties.
Claims7
A lubricating oil composition for a refrigerator in which 1,1,1,2-tetrafluoroethane is used as the refrigerant, consisting essentially of the base oil a polyoxyalkylene glycol monoether represented by the general formula
- R.sub.1 --(--OR.sub.2 --)--.sub.m OH
- wherein R.sub.1 is an alkyl group having 1-18 carbon atoms, m is an integer of 5-70, R.sub.2 is an alkylene group having 2-4 carbon atoms and a ratio ".alpha." of 0-0.8 between. (the number of --OR.sub.2 -- group wherein R.sub.2 is ethylene group)/m in the molecule, the polyoxyalkylene glycol monoether having.a pour point of up to -10.degree. C. and a kinematic viscosity of 2-110 cSt at 100.degree. C., a number average molecular weight of 500-1500 and a ratio (Mw/Mn) of 1.0-1.20 between the weight average molecular weight (Mw) and the number average molecular weight (Mn).
A lubricating oil composition for a refrigerator in which 1,1,1,2-tetrafluoroethane is used as the refrigerant, consisting essentially of the base oil a polyoxyalkylene glycol monoether represented by the general formula
- R.sub.1 --(--OR.sub.2 --)--.sub.m OH
- wherein R.sub.1 is an alkyl group having 1-18 carbon atoms, m is an integer of 5-70, R.sub.2 is an alkylene group having 2-4 carbon atoms and a ratio of 0-0.8 between (the number of --OR.sub.2 -- group wherein R.sub.2 is ethylene group)/m in the molecule, the polyoxyalkylene glycol monoether having a pour point of up to -10.degree. C., a kinematic viscosity of 2-110 cSt at 100.degree. C., a number average molecular weight of 500-1500 and a ratio (Mw/Mn) of 1.00-1.20 between the weight average molecular weight (Mw) and the number average molecular weight (Mn), further comprising:
- (A) a phosphate represented by the general formula ##STR6## wherein R.sub.3 is an alkyl having 1-3 carbon atoms and n is an integer of 0-2, in an amount of 0.1-5.0 parts by weight per 100 parts by weight of the base oil.
A lubricating oil composition for a refrigerator in which 1,1,1,2-tetrafluoroethane is used as the refrigerant, consisting essentially of the base oil a polyoxyalkylene glycol monoether represented by the general formula
- R.sub.1 --(--OR.sub.2 --)--.sub.m OH
- wherein R.sub.1 is an alkyl group having 1-18 carbon atoms, m is an integer of 5-70, R.sub.2 is an alkylene group having 2-4 carbon atoms and a ratio of ".alpha." if 0-0.8 between (the number of --OR.sub.2 -- group wherein R.sub.2 is ethylene group)/m in the molecule, the polyoxyalkylene glycol monoether having a pour point of up to -10.degree. C., a kinematic viscosity of 2-110 cSt at 100.degree. C., a number average molecular weight of 500-1500 and a ratio (Mw/Mn) of 1.00-1.20 between the weight average molecular weight (Mw) and the number average molecular weight (Mn), further comprising:
- (A) a phosphate represented by the general formula ##STR7## wherein R.sub.3 is an alkyl group having 1-3 carbon atoms and n is an integer of 0-2, in an amount of 0.1-5.0 parts by weight per 100 parts by weight of the base oil and
- (B) at least one kind of an epoxy compound selected from the group consisting of
- (i) phenylglycidyl ether type epoxy compounds,
- (ii) epoxidized fatty acid monoesters and
- (iii) epoxidized vegetable oils, in an amount of 0.1-5.0 parts by weight per 100 parts by weight of the base oil.
Dependencies are inferred from the claim text.