摘要:
A refrigerating machine oil for a carbon dioxide refrigerant according to the present invention contains polyalkylene glycol represented by the following general formula (1):
R 1 {-(OR 3 ) n -OR 2 } m (1)
[where R 1 represents a residue obtained by removing m hydroxyl groups from an organic compound having three to ten hydroxyl groups, R 2 hydrogen, an alkylene group of one to five carbons, or an acyl group of one to five carbons, R 3 an alkylene group of two to four carbons, m an integer of 3 to 10, and n such an integer that a number average molecular weight of the polyalkylene glycol (1) becomes 500 to 3000], wherein a kinematic viscosity at 100°C of the polyalkylene glycol is 5-20 mm 2 /s.
摘要:
A refrigerating machine oil for a carbon dioxide refrigerant according to the invention is a refrigerating machine oil comprising polyalkylene glycol represented by the following general formula (1) :
R 1 {-(OR 2 ) n -OH} m (1)
[where R 1 represents a residue of an organic compound having a hydroxyl group, from which the hydroxyl group has been removed, R 2 an alkylene group, and m and n respective integers], wherein a number average molecular weight of the polyalkylene glycol is not less than 500 nor more than 5000, wherein a rate of ethylene group among the alkylene group in the polyalkylene glycol is more than 0 and not more than 80 mol%, and wherein a rate of molecules in which the alkylene group bonded to a terminal hydroxyl group in the polyalkylene glycol is an ethylene group, is not more than 20 mol%.