Comparison of the Rheological Characteristics of Alginate and Synthetic Thickeners

Abstract

The rheological characteristics of printing pastes without dyestuff containing and of printing pastes having a different concentration of reactive dyestuff containing alginate respectively synthetic thickeners, have been studied. The classic rotation and the newer, in destructive oscillation method, which enabled the precise determination of viscoelasticity, was applied. The trials were carried out using low shear deformation (y) where shear tension (r) was measured. At constant oscillation frequencies (amplitude-sweep) an optimal linearity area and at a constant deformation amplitude (frequency-sweep) the elastic (G‘) and viscose (G”) part as well as the phase movement (tan 8) were determined. It was found, that the share of the viscose component in printing pastes containing a synthetic thickener was greater. This share decreases when increasing the concentration of the dyestuff.