Coatings, Paints | Viscosity Measurement of Paints and Coatings at High Shear Rates with RheolabQC
How to determine the application behavior of paints and coatings during brushing and spraying? RheolabQC equipped with a measurement system with a large surface area makes it possible to simulate high shear loads.
The viscosity of paints and coatings has to be optimized for their end-use performance. To meet customer requirements the sample’s leveling behavior, sagging resistance, film thickness as well as the application behavior during e.g. brushing or spraying has to be analyzed. Each process can be linked to a shear rate range to simulate the application with a rotational rheometer.
All measurements were performed with the Anton Paar rotational rheometer RheolabQC with a concentric cylinder measuring system. The cylinder B-CC28.4 was used together with the cup C-CC27 to simulate high shear loads. With this system, a smaller gap distance than specified in ISO 3219 enables higher shear rates (>6,500 s-1) to simulate coatings/spraying processes. With the standard CC27 measuring system and RheolabQC, the maximum theoretical shear rate is limited to 1,547.7 s-1. To keep cleaning to a minimum and enhance throughput, disposable C-CC27 aluminum cups can be used. The measuring system is heated or cooled with the Peltier temperature device C-PTD 180/AIR/QC, which can be controlled via a PC using RheoCompass™ Light software.
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