| 摘要 |
PURPOSE:To provide the subject composition satisfied with the excellent characteristics of the conventional Freon, capable of being used as a Freon substitute and having excellent characteristics as a solvent, etc., by comprising R123, R141b and methylene chloride. CONSTITUTION:A fluorohydrocarbon pseudoazeotropic composition comprises 49-97wt.% of (A) 1,1-dichloro-2,2,2-trichloroethane (R123), 2-49wt.% of (B) 1,1- dichloro-1-fluoro-1-fluoroethane (R141b) and 2-20wt.% of (C) methylene chloride preferably in an A:B:C ratio (wt.%) of (55-75):(15-35):(5-15). The composition exists as a pseudoazeotropic composition, is especially useful as a cleansing solvent having an excellent cleansing power and with a reduced change of the composition even when recycled. The composition can be used in the same manner as the conventional single Freon and does not require the large change of conventional techniques. |
