Effect of Salts on Physical Interactions in Wool Dyeing with Acid Dyes

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

The modified Donnan model, which considers the dye distribution coefficient as a function of salt concentration and property in the dyebath, is used to describe the dyeing behavior of wool with acid dyes and different kinds of salts. This modification is based on the understanding that salt anions are either kosmotropes (water-structure maker) or chaotropes (water-structure breaker). They affect the free energy of the dyebath through their influence on water structures. As is well known, adding salt to the dyebath decreases dye sorption due to its reduction of ionic attraction between negatively charged acid dyes and positively charged wool fibers. However, adding some salts such as sulfate and dihydrogen phosphate can increase dye sorption if the salt concentration is high. This phenomenon cannot be explained by the classic theory of salt functions in dyeing. The modified Donnan model is used to explain quantitatively both the de crease and increase of acid dye sorption on wool with increasing salt concentration.

Original languageEnglish (US)
Pages (from-to)615-620
Number of pages6
JournalTextile Research Journal
Volume68
Issue number8
DOIs
StatePublished - Jan 1 1998

Fingerprint

Wool
Dyeing
Coloring Agents
Dyes
Salts
Acids
Sorption
Water
Wool fibers
Free energy
Sulfates
Anions
Phosphates
Negative ions

ASJC Scopus subject areas

  • Chemical Engineering (miscellaneous)
  • Polymers and Plastics

Cite this

Effect of Salts on Physical Interactions in Wool Dyeing with Acid Dyes. / Yang, Yiqi.

In: Textile Research Journal, Vol. 68, No. 8, 01.01.1998, p. 615-620.

Research output: Contribution to journalArticle

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