초록 ▼

A lubricating oil for a flon refrigerant, containing a polyglycol compound having a kinematic viscosity at 40.degree. C. of at least 30 cSt, a viscosity index of at least 150 and a water content of not more than 200 ppm as a main component. The lubricating oil of the present invention has good stabi

A lubricating oil for a flon refrigerant, containing a polyglycol compound having a kinematic viscosity at 40.degree. C. of at least 30 cSt, a viscosity index of at least 150 and a water content of not more than 200 ppm as a main component. The lubricating oil of the present invention has good stability in the presence of a flon refrigerant, does not cause the copper plating phenomenon and has good compatibility with not only flon-11 and flon-12 but also sparingly soluble refrigerants such as hydrogen-containing flon compounds and perfluoroalkane.

대표청구항 ▼

[ What is claimed is:] [1.]1. A lubricating oil for a flon refrigerant, said oil consisting essentially of as a main component, a polyglycol compound having a kinematic viscosity at 40.degree. C. of at least 30 cSt, a viscosity index of at least 150 and a low water content which is sufficient to cau

[ What is claimed is:] [1.]1. A lubricating oil for a flon refrigerant, said oil consisting essentially of as a main component, a polyglycol compound having a kinematic viscosity at 40.degree. C. of at least 30 cSt, a viscosity index of at least 150 and a low water content which is sufficient to cause the compound to be hygroscopic and which is not more than 50 ppm, and the polyglycol compound being represented by the general formula: rein R.sup.1 and R.sup.3 are each hydrogen an alkyl group having 1 to 20 carbon atoms, R.sup.2 is a straight or branched alkylene group having 2 to 4 carbon atoms, and n is a number of at least 10.