| 摘要 |
PURPOSE:To obtain fluorinated hydrocarbon-based azeotropic mixture useful as substitute for fluorocarbon or solvent, etc., which comprises 1,3- dichloro-1,1,2,2,3-pentafluoropropane; 1,1-dichloro-1-fluoroethane and dichloromethane. CONSTITUTION:(A) 8-31wt.%, preferably 15-25wt.% 1,3-dichloro-1,1,2,2,3- pentafluoropropane is mixed with (B) 36-88wt.%, preferably 62-72wt.% 1,1- dichloro-1-fluoroethane and (C) 3-38wt.%, preferably 8-18wt.% dichloromethane (especially A = about 20wt.%, B = about 67wt.% and C = about 13wt.% as azeotropic composition) as essential ingredients. Said mixture is incombustible and has equivalent or better properties than the properties of conventional fluorocarbon. Further, variation of composition in recycle is small because of existence of azeotropic point and thus said mixture is able to be used equally as conventional single fluorocarbon. Especially, said mixture has a dissolving power higher than R113 when used as a solvent. |
