THE DYEING PROPERTY OF POYAMIDE FIBER

VIII. ON THE RELATIONSHIP BETWEEN THE AFFINITY OF ACID DYES FOR AMILAN AND THE PAPERCHROMATOGRAPHY Rf-VALUE

Abstract

The Rf-values for 15 acid azodyes were determined by paperchromatographical method using different developers, and it was found that if water was used as the developer, a close relation exists between the Rf-value and the affinity of the dye ion for Amilan.
From the determination of the Rf-value, in which the developers mixed with butanol, ethanol and water in the various ratios were used, it was found that the Rf-value varies with “inorganic property/organic property-value” of the dye and the developer, and showed a maximum where the values for both are nearly equal.
The relationship between the Rf-value obtained using water as developer and the affinity is discussed, and it is concluded that there is an intimate relation between them, provided that van der waals forces played an important role in the affinity of acid dyes for polyamide fiber. Furthermore, it is easy to obtain qualitatively the dyeing property of unknown acid azodyes for polyamide fiber by determining the Rf-value by the paperchromatography.