The utilization pf triethylamine ( TEA ) , triethanolamine ( TEOHA ) or choline chloride ( CC ) as a co-catalyst along with Na 2Co3, NO2 SiO3 or Na 3PO4 as a traditional fixing agent in exhaust dyeing of mercerized cotton, viscose and linen substrates with monochloro -S triazine reactive dyes at mild conditions as well as in producing reactive dyeings with enhanced coloration properties was explored . The results signify that : i) the extent of dye interactionand fixation is governed by the efficiency of catalization, i.e. , fixing agent /co-catayst > fixing Agent > co-catalyst , the type of co-catalyst , i.e., Fixing Agent / TEOHA Fixing Agent /CC, regardless of the used fixing agent , nature of the celluolosic substrate , i.e. Viscose >Mercerised Cotton > Linen Fabric , irrespective of the used catalytic system , ii) dyeing at 600C for 60 min in presence of 60 g /1Na2 SO4 constitutes the proper conditions for attaining higher colour yields , and iii) incorporation of these co-catalysts along with the traditional fixing agents under investigation , at proper concentrations and dyeing conditions seems to : modify both the dye and fibre structure , minimize dye resistivity , nehance dye and reactivity and substrate wettability , swellability and substantivity thereby given rise to higher extent of dye exhaution , interaction and fixation . A tentative mechanism of the reactions and / or interactions between the cellulosic substrates and the monochloro-S- triazine reactive dyes in presence of the aforementioned catalytic systems is suggested.
Catalytic System. Cellulosic Substrates, Dyebath Exhaution, Fixing Agent / Co-catalyst, Monochlorotriazine.
By: N.A. Ibrahim, M.R. El-Zairy*, A.R. El-Gamal*, and S.S. Ahmed* National Research Centre, Textile Re
Submit Date: 6/7/2010 18:00