Coatings, Paints | Rheology of Paints and Coatings
Comparing the thixotropy of coatings based on structural regeneration, leveling and sagging behavior. It offers insight on common quality control measurements using RheolabQC.
Structural regeneration, surface leveling and sagging behavior are significant quality characteristics for coatings. Therefore, the application behavior of two textured coatings was investigated using RheolabQC. These characteristics are also referred to as thixotropic behavior and contribute substantially to how a product is viewed by the end user.
Experimental Setup
Samples
Textured coatings and dispersion paints are special-effect coatings with the properties of a top coating. They form, in contrast to base coats, a thick layer which can be structured after application. A top coating is the final layer sealing lower layers and protecting them against external influences.
Test Procedure
All measurements were performed with an Anton Paar rotational rheometer RheolabQC with cylinder measuring system CC27 according to ISO 3219. ISO 3219 describes the construction of the cylinder geometry and defines the ratio of measuring cup diameter to measuring system diameter as 1.0847. This guarantees an industrial standard for shearing in the measuring gap, independent of the cylinder size. To keep cleaning to a minimum, disposable aluminum measuring cups can be used. High sample throughput with minimum required cleaning is guaranteed. The unique Peltier temperature device C-PTD 180/AIR/QC enables quick and accurate temperature control for measurements in a range from 0 °C to 180 °C. The RheoCompass™ software can be used to apply defined temperature profiles during the measurement.
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