Study of hydrolytic kinetics of vinyl sulfone reactive dye in siloxane reverse micro-emulsion

Abstract

Reactive dyes maintain a long reaction with fiber and show a high dye uptake and fixation rate, and effectively decrease the dyeing waste water in siloxane reverse micro-emulsion. However, little research has been carried out into the hydrolysis reaction of reactive dyes in reverse micro-emulsion. In this study, Reactive Blue 19 was selected as a model vinyl sulfone reactive dye to study its hydrolysis in siloxane reverse micro-emulsion. The hydrolysis reaction was analyzed using high performance liquid chromatography. The results show that the hydrolysis rate of vinyl sulfone dyes in siloxane reverse micro-emulsion was slower than that in a traditional bath. Influences due to the ratio of aqueous dye solution to siloxane, non-ionic surfactant, cellulose fiber, and temperature on the hydrolysis reaction of vinyl sulfone reactive dye were also researched. The results show that with more aqueous solution emulsified in the siloxane media, the hydrolysis reaction of vinyl sulfone dye is faster. Reactive dyes were emulsified into a water micro-environment with non-ionic surfactant, which formed reverse micro-emulsion, and decreased the content of free water; this further influenced the hydrolysis of reactive dye.

Dyeing Property and Adsorption Kinetics of Reactive Dyes for Cotton Textiles in Salt-Free Non-Aqueous Dyeing Systems

“…The apparent sorption of reactive dye was over 95% in non-aqueous dyeing systems, indicating that a lot of the dyes could react with cotton fabrics. Furthermore, the dyeing temperature is lower (25 °C in non-aqueous media vs. 60 °C in water base), and the hydrolysis rate of reactive dye in non-aqueous dyeing systems is slower than that in the traditional water base [15,16]. As a result, a lot of reactive dyes can bond with cotton textiles, and a higher fixation rate can be obtained in the non-aqueous dyeing systems [29,30].…”

“…Non-aqueous dyeing media cannot dissolve water-soluble dye but can transport material and transfer energy. A major advantage of non-aqueous dyeing technology is that little water is needed because dissolving the dye and other chemical agents, and fiber swelling require only a small amount of aqueous solution [14,15,16]. Furthermore, all the aqueous solution can be completely absorbed by the cotton textile without using any accelerating salts during the dyeing process.…”

Influence of Ethylene Oxide Content in Nonionic Surfactant to the Hydrolysis of Reactive Dye in Silicone Non-Aqueous Dyeing System

“…Acidic buffer solution and alkaline buffer solution were prepared using the method which was introduced in the previous investigations [8,9].…”

“…The reasons for the slower hydrolysis of reactive dye were mainly because the grasping ability of surfactant for dye aqueous solution, the faster dyeing rate, the lower dyeing temperature (30 °C in siloxane non-aqueous dyeing system vs. 60 °C in conventional aqueous solution dyeing system), etc. [8,9,10]. When comparing the hydrolysis of dye in siloxane non-aqueous dyeing system, the hydrolytic reaction of dye was faster when surfactant was not added during dyeing.…”

“…Nonionic surfactants are typically added as an emulsifier in a siloxane non-aqueous dyeing system [7,8]. However, information about the influence of nonionic surfactants on the hydrolytic behavior of reactive dye is limited in the siloxane non-aqueous emulsion dyeing system; in particular, the detailed information about the effect of the ethylene oxide content on the hydrolytic behavior of reactive dye has not been systematically studied.…”