DYEING SILK WITH DYES CONTAINING TWO REACTIVE GROUPS

A high utilization ratio in silk dyeing can be achieved by using dyes containingtwo reactive groups.Two types of these dyes were used,one containing twomonochlorotriazinyl groups(Ke reactive dyes),the other containting amonochlorotriazinyl group and a β-sulphatoethyl sulphonyl group(M reactive dyes)The application of these dyes was studled on the laboratory scale.The dyeingwas carrled out by one-step batch method.The dyeing conditions wereoptimized to get the maxlum utilization ratio.They are PH8-9(for M dyes),9(for KE type dyes),salt concentration 50g/1,dyeing temp.80℃ and dyeingtlme 100 min.The utilization ratio was about 80-93% depending on the dyesused.The dyeings showed high resistance towards aeld and alkaline hydrolysis.The hydrolysis was about 1.12%(at PH6.8)to 3.1%(at PH 10.6).It was muchlower than that of dyeings with conventional reactive dyes.The soaping,washing,perspiration and rubbing fastness of dyed silk fabrics were excellent.