The coating performance of adhesives largely determines the consistency of the final product quality and production efficiency. As a key tool for characterizing the rheological behavior of adhesives, rotational rheometers play an irreplaceable role in optimizing coating processes.

Key Rheological Parameters in the Coating Process

Zero-shear viscosity: The viscosity at low shear rates determines whether the adhesive will flow or level after coating. It can be accurately measured using creep tests or low-rate steady-state scans on a rheometer.

Thixotropy: High shear during coating reduces the adhesive viscosity to make coating easier, while the viscosity recovers after coating to prevent flow. The three-step thixotropy test (low-high-low shear) quantitatively evaluates thixotropic recovery time and recovery rate.

Yield stress: The minimum stress required for the adhesive to start flowing. If the yield stress is too low, the coating may run on vertical surfaces; if too high, coating becomes difficult. Oscillatory stress scanning is the most commonly used method to test yield stress.

TA DHR Rheometer Coating Simulation Features

TA Instruments DHR series rheometers, when combined with a coating pool accessory, can simulate the rheological behavior under actual process conditions like blade coating or roller coating. With the automatic analysis feature in TRIOS software, key process parameter recommendations can be quickly generated.

Dehui offers TA rheometer pre-sale demonstrations and coating process optimization consulting.

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