Printing Technology In One Paste With Mixture Disperse Dyes And Reactive Dyes

Polyester/cotton blended fabric combines the stiffness, smoothness, quick drying, durability of polyester fabric and softness, comfort, good moisture absorption, air permeability of cotton fabric, so it is favored by the vast number of consumers. Due to the different physical structure and chemical properties of polyester fiber and cotton fiber, the printing of polyester/cotton blended fabric varies a lot. At present, the printing of polyester/cotton blended fabric which uses the pigment printing process takes up to60-70%. Pigment printing has some advantages over others, such as simple process. However, it is difficult to meet the consumers’demand because of the hard hand, poor crockfastness and rubbing fastness, poor permeability when applied in the deep rich color and large area design. One paste with disperse dye and reactive dye printing process has the advantages of bright color, good handle and fastness, particularly suitable for the large area, dark shade and high fastness printing. But there are a lot of technical problems, mainly reflecting in the following aspects:Firstly, most of the disperse dyes are alkali sensitive, the color paste contains alkaline agent, so when this method is applied, it may cause color change, fade, and even structure destruction. Secondly, disperse dyes only works under high temperature which can easily cause yellowing of polyester/cotton blended fabrics (mainly cotton fiber). Besides, the disperse dyes and reactive dyes stain different fiber, which may cause the color be not pure and the background contamination be bad.This project firstly picked out13dyes which are relatively alkali-resisting from31kinds of disperse dyes. They are Disperse Yellow114, Disperse Orange BROB, Disperse Orange73, Disperse Orange30, Disperse Red153, Disperse Red356, Disperse Red135:1, Disperse Red900, Disperse Blue825, Disperse Blue60, Disperse Blue820, Disperse Blue BON and Disperse Black SA-BK. This experiment verified the high temperature resistant property of PB series of reactive dyes and K type reactive dyes. In order to simplify the process, this paper used one phase method (complete feed method) printing process, and studied on how the paste and urea content, alkali concentration affect the fixation rate and color shade of reactive dyes and disperse dyes. This paper selected the processes of the curing and atmospheric high temperature steaming. And then studied the influence of baking temperature and time on fixation rate and color shade of reactive dyes and disperse dyes. Through the above analysis, the optimum technology was obtained. Mixed alkali washing using different surfaces may very well prevent background contamination, and the contamination situation is evaluated through fabric bare land light reflectance curve.The results show that the alkaline-stable disperse dyes have13kinds, and the selected6kinds of reactive dyes have good high temperature resistance. Through the study of the nature of RD50and SA pastes(for example, paste rate, rheology, hold water, chemical compatibility, printing effect of nature) shows that RD50has the advantages of high yield of forming thickening agent, good stock stability but poor sharpness and paste removal. Using RD50is more brilliant shade than SA in102℃steaming, but the color is dark in170℃baking. The results show that the optimum proportion of mixture paste(SA:RD50) is75:25. The main factors, including drying temperature, baking time and temperature, urea and alkali consumption, were analyzed, and the results showed that Urea consumption in8-10%is advisable, alkali concentration in1-2%is preferred and the optimum technology is in170-180℃,7-10min. The soaping of disperse dye printing fabric was researched, and the result suggests that disperse dye in soaping stage to cotton contamination is more light than polyester itself. Mixed alkali washing, the Peregal O and anti-staining agents used may very well prevent background contamination. By testing the fastness and background contamination situation of the T/C fabric, the experimental process can meet the requirements of production. In comparing with traditional curing process, the high temperature steaming process has advantages of high color yield, more brilliant shade.