New Concentrated Dyestuffs in Fiber Reactive Dyes

Concentrated Reactive Dyes:
In order to reduce the cost of dyeing and improve the fastness properties, almost all dyestuff manufacturers have introduced the above dyes as economical and eco friendly series.

These are either bifinctional or multifucntional type of reactive dyes.

Every manufacturer gives a special name and suffix that denotes the concentration, economy and eco-friendliness.

DE, EC, SP, Supra, HF are some of the well known suffixes.

What are the properties of multifunctional dyes?

There are dyes that have more than one chromophore - coloring matter and more than one auxo-chrome - the linking or reactive part.

The multifunctional dyes have special tones and shades that were usually dyed using two are more dyestuff combinations. For example a bright scarlet dyestuff is available in this class. Usually a scarlet shade is dyed with a combination of a red and orange or red and yellow. Similarly multi auxochromes yields very high wash fastness due to the strong multi faceted bonding of the dyestuff molecule with fiber.

Since these multifunctional dyes have more reactive groups, the exhuation and fixation rates will be higher than conventional bifunctional dyes, resulting in better utilization of dyestuff and lower pollution load to effluent.