Influence of pH in Reactive Dyeing

Influence of pH in Reactive Dyeing:
Let us discuss about the general quality of all reactive classes now in the market.
All reactive dyestuffs are very much sensitive to the concentrations of alkali and pH in turn. The cleavage of one or two chloride ions from the dyestuff molecule and the reaction of the rest of the dyestuff molecule with the secondary hydroxyl group of cellulose, producing a strong covalent bonding is the essence of reactive dyeing in total.
But how much alkali and how much pH is required for each class of reactive dyestuff depend on the reactivity of the dyestuff itself.
M BRAND DYES are highly reactive requiring comparatively milder conditions in dye fixation. They are primarily of interest in dyeing at normal room temperature (about 25º - 30º Deg. C) using Soda Ash or Sodium Bicarbonate. M BRAND dyes are applicable to cellulosic textiles by Batch-wise, Semi-continuous and Continuous methods in conventional textile machinery like open-vat, Package, Jet, Jig, Winch and padding mangle. The versatility in various application procedures and the availability of wide range of bright and fast shades are the outstanding features of this class of dyestuffs.

Due to the very high reactivity of this class of dyestuff, they require lesser amount of alkali for fixation. A pH of 9.3 to 9.8 will be sufficient for proper fixation of the dye to cellulose.

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