Usage
The dyes contain a reactive group (often trichlorotriazine), either a haloheterocycle or an activated double bond, that, when applied to a fibre in an alkaline dye bath, forms a chemical bond with an hydroxyl group on the cellulosic fibre.
R = Chromophore
Cell = Cellulose
And trichlorotriazine:
Reactive dyeing is now the most important method for the coloration of cellulosic fibres. Reactive dyes can also be applied on wool and nylon; in the latter case they are applied under weakly acidic conditions. Reactive dyes have a low utilization degree compared to other types of dyestuff, since the functional group also bonds to water, creating hydrolysis.
Reactive dyes are categorized by functional group.
| Functiona | Fixation | Temperature | Included in Brands |
|---|---|---|---|
| Monochlorotriazine | Haloheterocycle | 80˚ | Basilen E & P Cibacron E Procion H,HE |
| Monofluorochlorotriazine | Haloheterocycle | 40˚ | Cibacron F & C |
| Dichlorotriazine | Haloheterocycle | 30˚ | Basilen M Procion MX |
| Difluorochloropyrimidine | Haloheterocycle | 40˚ | Levafix EA Drimarene K & R |
| Dichloroquinoxaline | Haloheterocycle | 40˚ | Levafix E |
| Trichloropyrimidine | Haloheterocycle | 80-98˚ | Drimarene X & Z Cibacron T |
| Vinyl sulfone | activated double bond | 40˚ | Remazol |
| Vinyl amide | activated double bond | 40˚ | Remazol |
Read more about this topic: Reactive Dye
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