Interactions between polysaccharide polymer thickener and bifunctional bireactive dye in the presence of nonionic surfactants. Part 1, Surface tension and rheological behaviour of different polysaccharide solutions
Kokol, Vanja
The quality of textile printing is closely related to the rheological characteristics of the printing paste which depend on the chemical structure of the thickener used, its concentration and the ...physico/chemical interaction with other paste components. The undesired interactions between the polysacharride guar gum thickenner and the bifunctional reactive dye after the addition of a nonionic surfactant were studied as a function of the degree of carboxymethilation (DS) of the guar gum polymer, the hydrophilic/hydrophobic structure of the surfactant, and the concentration of the surfactant on the reactive dye. The rheological investigations show that the destroying of the primary polymer cross-linked structure leads to stronger pseudoplasticity/elaticity of the paste due to hydrogen and covalent ether bonds of surfactants as individual molecules (below critical micelle concentration CMC), or as a micelle aggregates (above CMC) with the -OH groupsof the thickener. The interactions increase with the increasing HBL value and the surfactant concentratioj, and with the decreasing DS of the polymer. A highly hydrophilic surfactant produced a strong drop of viscosity and leads to phase separation. The addition of the reactive dye diminishes the hydrophilic interactions between the surfactant and the guar thickenner probably due to interactions between the reactive dye and the surfactant. The micellization process of the surfactant is not influenced by the presence of the reactive dye or gum molecules.
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