Study On Surface Modification And Ink-jet Printing With Reactive Dye For Cotton/polyamide Interwoven Fabric

Inkjet printing is an environmentally friendly and efficient technology.However,there are some problems in the inkjet printing of multi-component fabrics such as fuzzy pattern,low color depth and obvious color difference because of the significant difference in fiber properties of different fibers,which restricts the development of inkjet printing products and the application of inkjet printing technology.In view of the above problems,this study aimed to develop a surface modification method for cotton/polyamide interwoven fabrics and a dye-fixing method for reactive dyes to obtain high quality inkjet printing products.In this thesis,there were expounded that the mechanism of hydroxypropyl methyl cellulose(HPMC)inhibiting the ink movement on cotton/polyamide interwoven fabrics and the mechanism of reactive dyes reacting with cotton fibers and polyamide fibers.The main contents are as follows.(1)HPMC was used to modify the surface of the cotton/polyamide interwoven fabric.The excellent rheological property of the HPMC solution was conducive to form a continuous polymer film on the fabric surface after drying.The polymer film connected adjacent fibers and yarns,making mean flow pore size smaller and capillarity effect weakened.The polymer film changed the groups on fiber surfaces.As the result,the hydrophilicity of cotton fiber surfaces decreased,while the hydrophilicity of polyamide surfaces increased.The surface properties of the cotton/polyamide interwoven fabric were improved.The motion behaviors of the ink were restricted including diffusion and infiltration.More dye ink remained on the surface fibers in the preset position of the inkjet print.(2)HPMC film was able to restrict ink movement during steaming.Compared with sodium alginate,the K/S values of the cyan,magenta,yellow and black blocks inkjet printed on cotton/polyamide interwoven fabrics pretreated with HPMC were increased by 39 %,61 %,31 % and 31 %,respectively.And the pattern clarity was significantly improved.(3)A color fixing process,called acid-base two-step steaming,was developed to improve inkjet printing for cotton/polyamide interwoven fabrics.Acetic acid was added to the pretreated solution to get an acidic solution.Compared with the sodium alginate pretreatment and steaming,the K/S values of the cyan,magenta,yellow and black blocks on cotton/polyamide interwoven fabrics were increased by 75 %,102 %,181 %and 208 %,respectively,which pretreated with HPMC and fixed color by acid-base two-step steaming.HPMC film still had excellent effect to restrict ink movement under acidic conditions.In a word,the acid-base two-step steaming process combined HPMC pretreatment could significantly improve the color depth and pattern definition for cotton/polyamide interwoven fabrics.(4)HPMC pretreatment and the acid-base two-step steaming process were generally effective for improving the inkjet printing product quality of cotton/polyamide interwoven fabrics with different yarn density,different fiber proportion or different gram weight,which was beneficial to improve product quality and promote the application and popularization of inkjet printing technology.