| 摘要 |
PURPOSE:To obtain a composition for refrigeration cycle containing a hydrofluorocarbon, a refrigerator oil and a desiccant, thus it is capable of adsorbing and removing moisture efficiently without decomposition of the desiccant and occurrence of fine powder, further preventing chlorinated fluorocarbon substitutes from being decomposed. CONSTITUTION:This composition comprises (A) a hydrofluorocarbon (preferably having a small size of molecule, particularly containing difluoromethane), (B) a refrigerator oil and (C) a desiccant of less than 2.77wt.% difluoromethane adsorption according to the McBain method (preferably it is a sodium-potassium A type zeolite in which the sodium content is more than 6wt.%, the potassium content is more than 5wt.% where the total of Na+K is 13 to 20wt.%). |
