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One-coat epoxy coating development for the improvement of UV stability by DPP pigments

Pigments are added into coatings to enhance aesthetical properties and other functionalities, such as UV stability and corrosion resistance. In this study, one-coat epoxy system with bright orange color, UV stability, and corrosion resistance were developed by incorporating diketopyrrolopyrrole (DPP) into epoxy resins. A set of coating formulations were generated with different pigment volume concentrations. Coatings with different formulations were exposed in UV aging chamber for different time periods. The UV stability of the coatings were evaluated by color difference, gloss retention, and thickness change. Techniques including UV/Vis, SEM, optical microscope, FTIR, and EIS were used to characterize the performance of DPP pigmented epoxy coatings. The one-coat epoxy system retained the two properties of UV stability and corrosion resistance.

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Dyes and Pigments

Volume 151, April 2018, Pages 157-164

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