Abstract
The work presented in this article involves the study of rheometric profile of several rheological additives in two-component (2K) high build epoxy zinc phosphate primer and two-component high build aliphatic polyurethane topcoat. Viscosity profile and thixotropic behavior at different shear rates have been determined for both the paints using Physica MCR 301 Rheometer of Anton Paar. The valuable information derived from these measurements led to better insight into the influence of these rheological additives on important paint properties like flow and leveling, sag control, in-can settling during storage, etc. Rheometric results were also compared with the results obtained during the actual application of these experimental coatings on mild steel panels. From the rheological study it was concluded that the thickeners based on surface-modified clay and organically modified castor oil derivative work well in epoxy zinc phosphate primer whereas polyurea-based thickener showed better results than other rheological additives in the case of the 2K polyurethane system. Measurement of low shear and high shear viscosity response of different thickeners helps in predicting storage and application behavior of these coatings which correlates well with the actual observation.
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References
Varela Lopez, F, Rosen, M, “Rheological Effects in Roll Coating of Paints.” Lat. Am. Appl. Res., 32 247–252 (2002)
Bosma, M, Brinkhuis, R, Coopmans, J, Reuvers, B, “The Role of Sag Control Agents in Optimizing the Sag/Leveling Balance and a New Powerful Tool to Study This.” Prog. Org. Coat., 55 P97–P104 (2006)
Chhabra, RP, Richardson, JF, Non-Newtonian Flow and Applied Rheology: Engineering Applications, 2nd ed., p. 37. Butterworth-Heinemann/IChemE series, Oxford, 2008
Osterhold, M, “Rheological Methods for Characterizing Modern Paint Systems.” Prog. Org. Coat., 40 131–137 (2000)
Ettlinger, M, Ladwig, I, Weise, A, “Surface Modified Fumed Silica for Modern Coatings.” Prog. Org. Coat., 40 31–34 (2000)
Whittingstall, P, Paint Evaluation Using Rheology, RH059 TA Instruments Inc., New Castle, DE
Rheology Handbook: A Practical Guide to Rheological Additives, pp. 3, 4, Elementis Specialities Inc., Hightstown, NJ
Manuscript to the Lecture on Rheology, Part 1, 2004, Anton Paar Gmbh, Ostfildern, Germany
OCCA, Surface Coating Materials and Their Usage, 2nd ed., p. 365, V-I Chapman and Hall, 1983
Christ, U, Bittner, A, “Rheology Control of Organic Coatings with New Hydrophobic Silicas.” Prog. Org. Coat., 24 29–41 (1994)
Schoff, CK, “Recent Advances in the Rheology of High Solids Coatings.” Prog. Org. Coat., 4 189–208 (1976)
Cohu, O, Magnin, A, “The Leveling of Thixotropic Coatings.” Prog. Org. Coat., 28 89–96 (1996)
Wyss, HM, Larsen, RJ, Weitz, DA, Oscillatory Rheology Measuring the Viscoelastic Behavior of Soft Material, www.google.com
Acknowledgments
The authors wish to thank Asian Paints management system for giving the opportunity to publish this work. The authors specially wish to thank Dr. Randhirshinh Parmar and Dr. B.P. Mallik for their continuous support from initial level of the activity. Furthermore, support received from all our colleagues and superiors, who contributed to this work, is gratefully acknowledged.
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Deka, A., Dey, N. Rheological studies of two component high build epoxy and polyurethane based high performance coatings. J Coat Technol Res 10, 305–315 (2013). https://doi.org/10.1007/s11998-012-9445-3
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DOI: https://doi.org/10.1007/s11998-012-9445-3