Study Of Alkaline Colored Burnt-out Printing In Polyester/Rayon Fabric

This paper selected a range of different structural types of disperse dyes which were dyed in acid condition and different alkali concentrations of alkaline conditions.The alkali resistance of different structural disperse dyes were compared through testing the K/S value and color shading,absorbance of dye residue,Infrared spectrographs of the hydrolysis dyes,etc.The relationships between the dyes structure and their alkali resistance were analyzed by calculating the Hückel charge values of the hydrolysis groups.Then the good alkali resistance disperse dyes were chosen to study and discuss the feasibility of the alkaline colored burnt-out printing technique in polyester/rayon wrap fabric.TThe results showed that:the alkali resistance strength of the azo and anthra- -quinone disperse dyes were involved with the Hückel charge values and quantities of the hydrolysis groups,and the alkaline resistance strength of the hydrolysis groups as follows:hydroxyl group > cyanogens group > amide group > eater group,furthermore the number of hydrolysis groups more,the alkali resistance worse;Heterocyclic disperse dyes because of their diverse structures,the alkali resistance strength changed a lot,for example the atomic force of molecular substituent and tautomerism can also affect the dyes alkali resistance;The alkaline burnt-out printing technique in polyester/rayon wrap fabric can get good results through the choice of paste,alkali dosage,curing temperature and time,the rinsing technique and so on,which illustrated this process feasible.