Surface Treatment And Reactive Dye Inkjet Printing Of Cotton/polyamide Interwoven Fabrics

Cotton/polyamide 6 fabric,which maintains not only the advantages of polyamide6 fabric,such as durability,resilience,high strength,less wrinkle and ease of coloration by a wide range of dyes,but also preserves the earthy texture of the cotton fabric,is the ideal fabric for current fashion and high-end clothing.However,due to the difference in surface structure and performance of cotton and polyamide fibers,the reactive dye molecules are more likely to enter the cotton fiber with water molecules and be fixed under alkaline conditions,while polyamide fiber is often colorless,resulting in the inkjet printing products of cotton/polyamide reactive dyes have problems such as light color,low sharpness and homo-chromaticity and poor color fixation rate.In this study,different kinds of surfactants and the composite systems of alpha olefin sulfonate and sodium alginate were used to treat the surface of the fabric,the spreading behavior of ink droplets on the treated fabric surface and the performance of ink jet printing were investigated.The mechanism of improving the ink-jet printing performance of cotton/polyamide fabric was explored by analyzing the structure and morphology of the treated sodium alginate/surfactant composite system and the surface performance of the treated fabric.The results show that the treatment solution formed by surfactants AOS and Na HCO₃ could improve the color performance,anti-bleeding performance and homo-chromaticity of cotton/polyamide fabric.Compared with untreated fabrics,the K/S value of magenta,cyan and yellow printed fabrics increased by 8.3,9.7,13.8,6.6,respectively,and the difference of K/S value between cotton and polyamide fiber decreased significantly.In this process,the surfactant formed directional adsorption on the fiber surface,which made the treated polyamide fiber change from hydrophobicity to hydrophilicity,and the amount of negative charge carried on the surface increases.The dyes were more evenly distributed on the surface of cotton and polyamide fiber and promoted its transfer to the interior of the fiber,thus improving the homogeneity and color strength of printed fabric.On this basis,we added sodium alginate to the treatment solution to form a polymer-surfactant composite system.Compared with AOS-Na HCO₃ and traditional SA treatment,the color strength,sharpness and color fastness of the ink-jet printing products has been further improved by using the composite system to treat cotton/polyamide fabrics.Compared with the traditional SA treatment,the K/S value of the printed fabric in magenta,cyan,black and yellow increased by 4.3,1.9,3.5 and 5.2,respectively,and the weft and warp width of the printed line decreased by 22%and 27%,respectively.The results show that the surfactant was distributed between the pores of the associated structure of SA and the treated solution could form a more uniform and continuous composite film.After the treatment,a more flat and dense film was formed on the surface of the fabric,which inhibited the penetration of ink droplets on the fiber surface.At the same time,AOS micellar enhanced the hydrophilicity of polyamide fiber and increased the surface negative charge,and further improved the pattern quality of cotton/polyamide inkjet printing products.This study provides a theoretical basis for further innovating the surface treatment technology of cotton brocade fabric before ink-jet printing,and has practical application value for improving the ink-jet printing effect of cotton/polyamide fabric.It provides a technical way to broaden the application of cotton/polyamide fabric in high-grade clothing and home textile fabrics.