Abstract
In this paper, the chemical dyestuff AzoPU is prepared by the —OH/—NCO reaction of dihydroxyethyl azobenzene (Azo) and polyurethane and its discoloration and heterogeneity are studied. At the same time, the difference between the AzoPU and traditional chemical dyestuffs are compared in thermal performance, color performance and other parameters. The study results show that the content of Azo in AzoPU is about 4%. The polyurethane of AzoPU is not directly connected to the hydroxyl and its internal electronic transition performance is basically the same as that of Azo. The peak absorbance of AzoPU is significantly lower than that of Azo, with a decrease of approximately 72.3%. AzoPU has strong crease resistance and heat resistance, whose K/S value reaches 4.58, 2.9 times that of the K/S value. It demonstrates that AzoPU can significantly enhance the color depth of the dye. AzoPU has strong adhesive force and it is difficult to fall off during the binding process with textiles. It has high content of color body, which can have better color performance under the same amount.
