Reuse technology of the residual solution of dip dyeing with reactive dyes
To practice the green development concept of water conservation,emission reduction,energy saving,and consumption reduction in the dyeing and printing industry,and to improve the utilization rate,economic and social benefit of reactive dyes,three different schemes are adopted to explore the reuse technology of reactive dyes dip dyeing residual so-lution,including cationic modification of cotton,acidification of residual solution to restore partially hydrolyzed dye,and crosslinking dyeing of residual solution to fabric.The dyeing uptake rate,fixation rate of the residual solution of reactive dyes dip dyeing,and the K/S value and color fastness of the dyed fabric are tested.The process method and conditions are optimized.The results show that the dyeing efficiency of the three treatment technologies is improved compared with the di-rect dyeing effect of the residual solution,in which the dyeing uptake rate of the X-3B residual solution after acidification is 63.56%,and the color fixation rate is nearly 50%.The dye uptake rate,color fixation rate and K/S value are increased by 1.1 times,1.5 times and 1.1 times respectively.With the increase of crosslinking agent concentration and the baking temperature,the K/S value of cotton fabric dyed with X-type and K-type active residual solution increased until it became smooth,especially the color fastness to soap washing and rubbing increased from grade 2.0 to grade 3.0.
reactive dyesresidual solution of dip dyeingreuse technologywater conservation and emission re-ductiongreen dyeing and finishing
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