| 摘要 |
PURPOSE:To obtain the title composition excellent in compatibility with difluoromethane, electrical insulating properties and resistance to moisture absorption by incorporating a specific refrigerating machine oil and difluoromethane. CONSTITUTION:The composition contains difluoromethane and a refrigerating machine oil comprising a base oil of one or more esters selected from the group consisting of esters obtained from a 2-10C aliphatic dihydric alcohol (a), a 4-9C branched saturated aliphatic monocarboxylic acid (derivative) (b) and a 4-6C saturated aliphatic dicarboxylic acid (derivative) (c) (e.g. neopentyl glycol/adipic acid/2-ethylhexanoic acid ester) and esters obtained from (a), a 3-10C branched saturated aliphatic monohydric alcohol and (c). |
