| 摘要 |
The invention provides refrigeration lubricants comprising a mixture of a hydrofluorocarbon and a polyoxyalkylene glycol hemi-ether of the formula RO-[(EO)m(PO)n]-H (I) wherein EO represents ethyleneoxy, PO represents propyleneoxy, R is C1-6 alkyl, and m and n represent average numbers of ethyleneoxy and propyleneoxy moieties in each hemi-ether molecule such that m/(m+n) is in the range 0 to 0.5 and n/(m+n) is in the range 0.5 to 1 and the hemi-ether has viscosity at 40 DEG C (DIN 51 562) in the range 10 to 46 mm<2>/s, and their preparation. |
