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Rheological studies of the cure of epoxy/polyester powder coatings containing titanium dioxide

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Abstract

The cure characteristics of a series of powder coatings containing titanium dioxide dispersed in an epoxy/polyester matrix are reported. The titanium dioxide pigments were produced via both the chloride and sulfate routes and coated with varying amounts of alumina and silica. Comparison data for formulations containing zinc oxide and silica are also included. The time to gelation for these powder coatings depends on a number of factors. Increasing the level of flow agent significantly reduces the time to gelation. The presence of traces of zinc inhibits cure in the case of the sulfate-based pigments. Varying levels of alumina and silica in the coating on the titanium dioxide coating also influence the time to gelation. Increasing the level of silica on the chloride-based coating increases the time to gelation, whereas in the case of the sulfate based coating the time to gelation is shortened. These differences are attributed to the effects of zinc in the coating and the effectiveness of the dicyandiamide catalysts.

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Acknowledgments

One author (ECT) wishes to thank Tioxide and the EPSRC for maintenance support during the course of this study.

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  1. WestCHEM, Department of Pure and Applied Chemistry, University of Strathclyde, Thomas Graham Building, 295 Cathedral Street, Glasgow, G1 1Xl, UK

    Emile C. Trottier, Stanley Affrossman & Richard A. Pethrick

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  1. Emile C. Trottier
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  2. Stanley Affrossman
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  3. Richard A. Pethrick
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Correspondence to Richard A. Pethrick.

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Trottier, E.C., Affrossman, S. & Pethrick, R.A. Rheological studies of the cure of epoxy/polyester powder coatings containing titanium dioxide. J Coat Technol Res 9, 725–733 (2012). https://doi.org/10.1007/s11998-012-9417-7

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