| abstract |
A lubricant for use in a refrigerator which operates with a chlorine-free Flon (fluorocarbon)-type refrigerant whose molecules do not contain chlorine. The lubricant contains a synthetic oil, and molybdenumoxysulfide diorganophosphorodithioate given by the following formula (1) and/or molybdenumoxysulfide diorganodithiocarbamate given by the following formula (2), the content of the compounds of formulae (1) and (2) in total ranges from 0.1 to 10 wt% to the content of the synthetic oil: {(RO)2PS2}2Mo2SXOY (1) where R represents a hydrocarbon group having 3 to 20 carbon atoms, and X and Y are numbers which meet the conditions of 0 </= X </= 4, 0 </= Y </= 4 and X + Y = 4) (R min 2NCS2)2Mo2SX min OY min (2) where R min is a hydrocarbon group having 3 to 20 carbon atoms and X min and Y min are numbers which meet the conditions of 0 </= X min </= 4, 0 </= Y min </= 4 and X min + Y = 4). |