Rheology of Coatings: Thixotropic Behavior with the MCR 72
The quality of a coating is directly related to its time-dependent rheological behavior, which can be measured by means of a 3-interval thixotropy test (3ITT). In this application report, measurements with the Anton Paar Rotational MCR 72 are used to determine the thixotropic behavior of coatings for quality control.
Structure recovery, surface leveling and flow behavior are key quality characteristics of coatings. These processes are referred to as “thixotropic behavior” and are largely responsible for whether a product is positively or negatively judged by the user. The thixotropic behavior of coatings cannot be determined with flow curves generated with spindle or cylinder systems or with flow viscosities measured with flow cups (DIN EN ISO 2431).
A suitable test for the direct measurement of the structure recovery of a coating following shear stress is the 3-interval thixotropy test (3ITT). The experimental setup closely simulates the application process, with three measuring periods that simulate the behavior of paints at rest, their behavior during the application, and the structural recovery after application.
In this application report, measurements with the Anton Paar Rotational MCR 72 are used to determine the thixotropic behavior of coatings for quality control.
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