Study Of High Substituted CMC Used For Reactive Dye Printing

Reactive dye printing relies heavily on the use of alginate thickeners. The unreliable supply, price, quality of alginate thickeners and it's weakness in and plate screen printing, however, have sparked investigation into other natural polysaccharides and synthetic thickeners as an alternative.In an attempt to be used for reactive dye printing, properties of three kinds of high substituted carboxymethyl cellulose were studied. Their rheological behavior and printing properties were compared with sodium alginate. It was shown that the rheological behavior of Cellcosan 700 was similar with alginate, and Cellcosan 2000 and Cellcosan 4000 were more suitable for rotary screen printing and fine pattern printing on hydrophilic textiles than sodium alginate, there printing properties were similar with alginate, and printing fastnesses were satisfactory. High substituted carboxymethyl celluloses are good substitution for sodium alginate of reactive dye printing.The rheological behavior and printing properties of blend paste composed of Cellcosan 700, Cellcosan 4000 and alginate sodium, synthetic thickener were tested. It was shown that all of thickeners were pseudoplastic, and they had little thixotropy. Viscosity of blends of CMC and sodium alginate (CMC/A) decreased with the amount of alginate increasing; but as the blends of CMC and synthetic thickener (CMC/L) as concerned, the paste's viscosity was lowest when their percentage were both 50%. The PVI of CMC/A increased with the amount of alginate increasing; but PVI of CMC/L did not decrease dramatically except the pastes containing 75% or more synthetic thickener. The viscosity variability of blend pastes were tested, which was caused by the addition of urea, sodium bicarbonate and sodium metanitrobenzne sulfonate. It was shown that blending proportion had no significant effect on the viscosity variability of CMC/A, and CMC/L were more stable to urea but had little defense to sodium bicarbonate and sodium metanitrobenzne sulfonate. When comparing printing properties, pastes containing more CMC provided higher color yield, but those containing more alginate or synthetic thickener provided better penetration.It was proved that high substituted carboxymethyl celluloses had no reaction with monochlorotriazine type reactive dye, but had a certain degree of reaction with vinyl sulfone reactive dye. The TLC and IR could analyze the reactions between CMC and reactive dyes qualitatively, and the SEC was expected to be quantitative analysis of their reactions.