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Insights into the composite coating for improving the weatherability of TiO2 white pigments

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Abstract

Several inorganic coatings, such as ZrO2, SiO2, Al2O3, and AlPO4, have been utilized in the TiO2 pigment industry in order to reduce the natural photoactivity of TiO2 nanoparticles. However, the different role of each material in impacting the TiO2 photoactivity lacks comparative studies, and this is critical to provide a composite coating strategy for TiO2 pigments to achieve optimal weatherability. Our work has shown that each of these coating materials plays a unique role in suppressing the TiO2 photoactivity. For instance, ZrO2 and AlPO4 increase the rate of charge recombination, while SiO2 reduces it. By comparing and analyzing their effects on the charge carrier processes, we have designed and created a composite-coated TiO2 pigment that features a sequential deposition of ZrO2, SiO2, and AlPO4. This product has been proved to exhibit excellent weatherability.

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Acknowledgments

This work was supported by the Shandong Province Natural Science Foundation (ZR202103030521), National Natural Science Foundation of China (No. 51702034), and the Key R&D Program of Shandong Province (No. 2019GNC106063).

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Authors and Affiliations

  1. Yantai University, Yantai, 264005, Shandong, China

    Ying Wang, Yangsong Chen, Ling Yang, Jincheng Jian, Shanshan Liu, Wei Cui & Tao He

  2. Shandong Jinhai Titanium Resources Technology Co., Ltd, Binzhou, 256600, Shandong, China

    Shiguang Guo

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  1. Ying Wang
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  3. Ling Yang
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Correspondence to Wei Cui.

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Wang, Y., Chen, Y., Yang, L. et al. Insights into the composite coating for improving the weatherability of TiO2 white pigments. J Coat Technol Res 20, 2125–2133 (2023). https://doi.org/10.1007/s11998-023-00809-z

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  • DOI: https://doi.org/10.1007/s11998-023-00809-z

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