Study On Dry-heat Transfer Printing With Reactive Dyes Of Cotton Fabric And Its Properties

In this paper, the cotton fabric was used as the substrate for dry-heat transfer printing using reactive dyes. The printing performances were investigated.First at all, the sodium alginate(SA) as the common thickener was used in reactive printing of cotton fabric. The rheology of SA was measured. To illustrate the compatibility of SA and various printing additives, effects of additives(the content of hot melt adhesive water-soluble polyester(ES-1), urea, glycerol, nano-Si O2 and the p H value) on the rheology of the SA were investigated. The results showed that SA solution possessed a smaller structural viscosity and exhibited the pseudoplastic fluid characteristic obviously, so it is suitable for the paper coating. ES-1 had good compatibility with SA when its concentration was less than 6%. Glycerol and nano-Si O2 had good compatibility with SA. The dynamic viscoelastic was instable when less urea was added into SA. The dynamic viscoelastic was stable when the p H value of SA solution was 5.48-11.84.Second, to prepare the transfer paper applied in the reactive dry-heat transfer printing of cotton fabric, the polymer modifier containing sodium alginate(SA) and polyester(ES-1) was used to modify the paper by coating method. Effects of the formula of the polymer modifier and the printing processes of on the color yield of the printed cotton, and the dye fixation and penetration were investigated. The color fastness properties for the printed fabric to washing and rubbing were measured. The results showed that, the washing and rubbing fastness of cotton prints reached up to grade 4 or above when the modifier contained 6% ES-1, 3% SA, 2% sodium carbonate, 2% trichloroacetic acid, 3% hygroscopic agent(urea/glycerol=3/2), 0.5% dicyandiamide and 0.5% nano-silica. The optimized printing process was as follows: the adhesion temperature 125℃ and pressure 3MPa, saturation steam mode, temperature 100℃ and dwell time 15 min.At last, effects of the steaming process, the outline sharpness of modified paper(the type of thickeners and the content of hygroscopic agent, nano-Si O2) and the humidity on the outline sharpness of the printed cotton were investigated. The results showed that, the outline sharpness of fabrics were mainly depended on the outline sharpness of modified papers and humidity. The washing and rubbing fastness of cotton prints reached up to grade 4 or above when the modifier contained 6% ES-1, 3% SA, 2% sodium carbonate, 2% trichloroacetic acid, 3% hygroscopic agent(urea/glycerol=3/2), 0.5% dicyandiamide and 0.5% nano-silica.