Abstract
The effect of the concentration of the surface active agent, Aerosol OT (Sodium di- (2-ethylhexyl) sulfosuccinate) and the amount of water solubilized in the ligroin has been studied on the soiing of cotton and wool fabrics in a drycleaning procedure. The Orange II, a water soluble dye, has been used as a model.
A soluble dye issolved in the ligroin solution is distributed both into the water in the micelles of the Aerosol OT and the into the absorbed water by fibers. A linear relationship has been found between the dye concentration [D] s in the solution and the dye concentration [D] f in fibers. The partition coefficient [D] f/ [D] s increases with increasing the amount of solubilized water and with decreasing the concentration of the Aerosol OT. The soiling of the water soluble dyes begins in the Aerosol OT solution at 1.5 in molar ratio of the water to the surface active agent or at 50% in solvent relative humidity. The soiling occurs remarkable at more than 2.8 in molar ratio and at more than 72% in solvent relative humidity.
