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Der Färbemechanismus neutralziehender Metallkomplexfarbstoffe: II. Der Lösungsmechanismus. 3. Mitteilung über textilchemische Untersuchungen

✍ Scribed by G. Back; Hch. Zollinger

Publisher
John Wiley and Sons
Year
1959
Tongue
German
Weight
766 KB
Volume
42
Category
Article
ISSN
0018-019X

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✦ Synopsis

Abstract

The adsorption isotherms of a neutral‐dyeing 1:2 chromium complex dyestuff on nylon 66 show that the dyeing process consists of a competitive adsorption at the amino end‐groups (salt binding mechanism, analogous to the adsorption of acid dyes and mineral acids) and a partition process (solution mechanism). In this paper the characteristics of the solution mechanism are investigated.

The solution mechanism becomes predominant with increasing acidity. It is the undissociated dye acid which is involved in this process. Sodium analyses show that practically no sodium salt of the dyes is adsorbed.

Comparative isotherms on nylon 66, 68 and 610 show that the portion of the solution mechanism decreases from type 66 to type 610. It becomes predominant on undrawn nylon 66.

On a polyurethane and on dinitrophenylated nylon 66 a FREUNDLICH‐type isotherm results, whereas on N‐ethylnylon 66 the adsorption follows probably a NERNST partition.

The conclusion is drawn that thc carbonamide groups of the polyamide fibre are essential for the solution mechanism.

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