Reactivedyes form a covalent bond between fibre and dye. They are classified dependingon the reactive group present and the optimized conditions in which they arebest used. Depending on the type of reaction, the reactive dyes are broadlydivided in to two categories:


  1. Dyes reacting through Nucleophilic substitution reactions
  2. Dyes reacting through Nucleophilic addition reactions.


A. Dyes reacting through Nucleophilic substitution reactions:



(1)Dichlorotriazynilamino types of dyes


These are more reactive thanmonochloro type of dyes and require lower temperature and milder alkali fordyeing and fixation. These are known as Cold brand reactive dyes.





(2)Monochlorotriazynylamino type of dyes


Theserequire higher temperature and stronger alkali for dyeing and fixation. Theseare called hot brand reactive dyes.








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Aboutthe Authors:


The authors are associatedwith the Textile & Engg. Institute, Ichalkaranji.