Studies On The Reactive Dyeing Properties Of Silk Fabrics

The reactive dyeing performance of reactive dyes with different reactive groups on silk fabrics was investigated. The low-salt dyeing methods of reactive dyes applied to silk fabrics were explored. The dyeing properties of silk/polyurethane fiber composite yarns (dynamie silk) with vinylsulphone/monochlorotriazaine reactive dyes together with the finishing technology of related fabrics were also discussed. The results obtained were as follows:Di-vinylsulphone and di-monochlorotriazaine reactive dyes could be used to dye silk fabrics under acidic and alkaline conditions. However these dyes showed the higher extent of fixation under alkaline conditions than under acidic conditions. For di-vinylsulphone reactive dyes, the high extent of exhaustion and fixation was reached if the dyeing was carried out under weakly alkaline conditions and at medium temperature. For di-monochlorotriazaine reactive dyes having low reactivity, the high temperature (90℃) dyeing at pH 9-10 was performed in order to increase the exhaustion and fixation extent.Sodium chloride, sodium sulfate, potassium chloride and potassium sulfate had good accelerating effect on reactive dyeing. The reasonable combination of these salts is good for low-salt dyeing. The optimum salt combination obtained was potassium chloride and potassium sulfate (15 g/L +15g/L). It was found that the dyeing method of pH sliding (from acidic to alkaline) could decrease the application quantity of salts, and the corresponding exhaustion and fixation extent was comparable to that of conventional dyeing methods.Vinylsulphone/monochlorotriazaine reactive dyes exhibited the good build-up properties on silk/polyurethane fiber composite yarns. The exhaustion and fixation of the dyes having low substantivity were greatly influenced by electrolyte and alkali concentrations.