Dyeing behavior of fluorescent dye DTAF on cotton fabrics

The dyeing of cotton fabric was performed with functional fluorescent dye 5(6)-(4,6-dichlorotriazinyl)amino fluorescein(DTAF).The effect of dye concentration and fixing temperature on K/S value of the dyed fabric was studied.The change rule and relationship of K/S value,reflectance curve and fluorescence emission spectra were investigated by varying dye-bath concentration.The results indicated that as the dye-bath concentration increased,the red-shifting of reflectance and fluorescence emission spectra of the dyed fabric were found.As the K/S value keeps increasing,the maximum emission wavelength and the fluorescence intensity of the dyed fabric increase firstly and then start to drop.When the dye-bath concentration was 0.10%(o.w.f),the maximum reflectivity of the dyed fabric can reach 130%.DTAF can greatly improve the anti-ultraviolet performance of cotton fabrics.When the dye-bath concentration is equal to or greater than 1.00%(o.w.f),the UPF value of the dyed fabric can reach 50+.