| 摘要 |
PURPOSE:To obtain a refrigerator oil composition having excellent lubricity and insulation properties by adding a phosphoric ester to an ester oil for refrigerator oil and specifying the concentrations of sodium and/or potassium. CONSTITUTION:(A) An ester oil as a refrigerator oil (polyol esters, polycarboxylic esters, fumarate oligomers, carbonic esters, hydroxypivalic esters) is combined with (B) a phosphoric ester (benzyl diphenyl phosphate) in an amount of 0.01 to 5wt.%, preferably 0.1 to 3wt.% based on the component (A), and the concentration of sodium and/or potassium is set to less than 0.1ppm. It is suitably used in refrigerators employing a nonchlorine and fluorine- containing refrigerant such as 1, 1, 1, 2-tetrafluoro-ethane (R134a). |
