Reactive Trigger
Chemical dyestuff groups containing a masked vinylsulfone group provide the basis for versatile bonding with cellulosic fibres. When sulfatoethylsulfone reactive dyes are exposed to alkaline conditions, they undergo an elimination reaction to form a vinylsulfone intermediate. This active form then creates a covalent bond with the hydroxyl groups of the textile.
Temperature Response
Fixation typically occurs in a warm bath at approximately 60 degrees Celsius. Because sulfatoethylsulfone reactive dyes are less reactive than dichlorotriazines, they offer better stability and are easier to apply evenly in large batches. The energy required for this process is a standard benchmark for medium-temperature dyeing cycles.
Material Compatibility
Application is common on cotton, linen and rayon due to the high fastness properties of the resulting bond. The sulfatoethylsulfone reactive dyes can be used in exhaust, continuous, or cold pad batch processes. This flexibility makes them the most widely used class of reactive dyes in the global garment industry.
Hydrolysis Rate
Interaction with water molecules can deactivate the dye before it reaches the fibre surface. If the pH is not controlled, the sulfatoethylsulfone reactive dyes convert into an unreactive form that must be removed during the soaping stage. Managing this side reaction is essential for achieving high fixation yields and bright shades.
