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Effect of artificial weathering and temperature cycling on the performance of coating systems used for wooden windows

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Abstract

The effects of ultraviolet light irradiation and water spray and temperature cycling on the color stability of waterborne coating systems on spruce were investigated. The test samples were treated with three coating systems (white and brown pigmented acrylate waterborne coatings systems with different layering) from six producers. The artificial weathering was carried out based on standardized (504 h) and increased weathering parameters (504 h). Thirty cycles of temperature changes were performed. Discoloration suggesting the rate of degradation process and color stability was measured by a spectrophotometer in L*a*b* color space. The results showed greater color stability of white coating systems during both experiments. The producer of acrylate coatings with iodopropynyl butyl carbamate and permethrin as biocides and benzotriazole, silicon dioxide and methylsiloxane as additives was characterized by the best coatings performance. The most sensitive color parameter to describe the surface quality as a result of irradiation and water spray has proven to be a change of lightness. A tendency towards degradation with increasing lightness was observed during weathering. The effect of temperature itself on color change was minimal. Scanning electron microscopy and energy dispersive spectroscopy revealed microscopic changes of coatings caused by artificial weathering.

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Acknowledgments

The authors are very grateful for the financial support of the University Internal Grant Agency of the Czech University of Life Sciences, Prague, Project CIGA No. 20174304 “Design of coating system and modification of artificial weathering test procedures applied on selected wood species”.

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Correspondence to Štěpán Hýsek.

Appendix

Appendix

See Table 10.

Table 10 Tukey´s HSD multiple comparison test of total color difference after artificial weathering

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Oberhofnerová, E., Hýsek, Š., Pánek, M. et al. Effect of artificial weathering and temperature cycling on the performance of coating systems used for wooden windows. J Coat Technol Res 15, 851–865 (2018). https://doi.org/10.1007/s11998-017-0033-4

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