In order to expand the application of natural dyes in bio-based fibers,quercetin was used to stain bio-based polynylon 56(PA56)fabric.The effects of dyeing bath pH,temperature,time,dye dosage and morting process on K/S value,color characteristic value and UV resistance of dyed fabric were studied.The re-sults showed that the optimal process of quercetin dyeing PA56 was as follows:dyeing bath pH 4,tempera-ture 80℃,time 40 min.Mordant treatment could effectively improve the color fastness of dyed fabrics,among which,the color fastness to washing,perspiration and light of ferrous sulfate with bath mordant dyeing reached above level 3-4.At the same time,the UV resistance of dyed fabrics was significantly improved,and the UPFAV value reached 50+.
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