Effects of the Air Content on the Rheological Properties of Coating Colours, 1999 Coating fundamentals Symposium Proceedings
I. Greiffenberg
Technische Universität Dresden
S. Lohmander, M. Rigdahl
Swedish Pulp and Paper Research Institute
The rheological properties of clay-based coating colours containing different amounts of air were evaluated at relatively low deformation rates. The amount of air was varied between 3 and 20 % and colours of three different
solids contents were used, 58, 60 and 62 %. In general, an increase in the amount of air in the colour led to an increase in rheological parameters such as viscosity, yield stress and plastic viscosity. The viscoelastic character of
the coating colours was also affected by the air content. In the linear region, the general result was that the storage shear modulus increased with increasing amount of air, whereas the phase angle was more or less unaffected. In the non-linear viscoelastic region, the influence of the air was less pronounced.
Effects of the Air Content on the Rheological Properties of Coating Colours, 1999 Coating fundamenta