Process of polylactic acid fabric color-deepening dyeing
Aiming at the problem of poor dyeing depth of polylactic acid fiber,the influences of glass transition temperature,pH value of dye solution and carrier dosage on dyeing depth were studied.In view of the fact that there is no special dye for polylactic acid fiber,the dyeing enhancement of Anocolon PUD series,Fino AC series and Longsheng UN SE series was tested.Among them,Longsheng UN SE series disperse dyes had the best dyeing depth when applied to polylactic acid fabric,and the color fastness to soap washing and sweat stains were above grade 4.Anocolon PUD series has the worst dyeing improvement,Fino AC series has good dyeing improvement,but the color fastness of the fabric is poor.The carrier can improve the lifting power of some dyes.The dyeing process that can improve the dyeing depth of polylactic acid fiber is as follows:heat-setting at 110 ℃ for 60 s,and adjusting the pH value of the dye solution to around 4.5 with acetic acid and sodium acetate,with a bath ratio of 10,and dyeing at room temperature.Heating up at 1 ℃/min to 70 ℃ and holding 10 minutes,then at 1 ℃/min to 105 ℃ for 40 minutes,and cleaning at 60 ℃ for 15 minutes.
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