Abstract
The diffusion profiles of Orange II (C. I. Acid Orange 7), Roccelline (C. I. Acid Red 88), and sodium 1-amino-4-n-butylaminoanthraquinone-2-sulfonate (B-IV) in nylon film-rolls were obtained at pH 3 and 90°C under the conditions that the rolls were contact with solutions containing a dye and a sodium n-alkylsulfate (SAS). Five kinds of SAS, such as octyl, decyl, dodecyl (SLS), tetradecyl (STS) and hexadecyl (SHS), were examined in this study. Diffusion profiles of binary mixtures were found to be categorized to four types; sigmoid, box, overdyeing and desorption. The desorption type was solely observed in the mixture diffusion of Orange II with STS or SHS. This suggests that the STS and SHS have high affinity on nylon. Diffusion profiles were markedly affected by the affinity and the concentration of both dyes and SAS's in the dye-bath. It was found that the amount of the dye diffused into film-rolls decreased with increasing the affinity and the concentration of SAS's in the bath. The diffusion coefficients of SLS and STS were estimated to be comparable to that of Orange II, and that of SHS was to that of B-IV. At the same time, diffusion profiles of Orange II in the presence of both SLS and SHS were obtained over 30 to 180 minutes.
