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Photoinduced hydrophilicity and self-cleaning characteristics of silicone-modified soya alkyd/TiO2 nanocomposite coating

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Abstract

Nano-TiO2-dispersed polymeric coatings have been extensively studied in recent years owing to their photocatalytic-induced self-cleaning characteristics. However, durability and long-term retention of self-cleaning performance of such coatings remain a challenge for practical applications. In the present work, we report the self-cleaning properties of nano-TiO2/silicone soya alkyd-based coating formulations comprising 0.5–5 wt% of nanofiller as well as conventional additives of rutile TiO2 and BaSO4. The nanocomposites were prepared by an in situ process involving dispersion of nano-TiO2 in soya oil, soya alkyd synthesis by alcoholic process, followed by silicone modification. The coatings prepared from the nanofiller-dispersed resin showed significant UV radiation-induced hydrophilicity and photocatalytic degradation of methylene blue (MB) solution. A coating formulation with 2 wt% of nano-TiO2 loading showed a decrease in water contact angle from 87° to < 10° after 24 h of UV radiation exposure and a 50% decrease in intensity of the 664-nm absorbance peak of MB solution after 8 h of UV irradiation. Further, Fourier transform infrared spectroscopy in reflectance mode (ATR-FTIR) and thermogravimetric analysis (TGA) studies revealed minimal degradation of the host matrix after 500 h of accelerated weathering studies with retention of self-cleaning characteristics. These results imply that silicone-modified alkyd resin can be a suitable host matrix for combining the requisite properties of self-cleaning, organic contaminant degradation, photocatalytic stability, and weathering resistance for sustainable self-cleaning applications.

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Acknowledgments

The authors would like to thank Dr. M. Patri, Director, and N. M. Gokhale, Senior scientist, of Naval Materials Research Laboratory for providing guidance and encouragement to carry out this work.

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Authors and Affiliations

  1. Naval Materials Research Laboratory, Ambernath, Maharashtra, 421506, India

    Sushil S. Pawar, R. Baloji Naik, Sangram K. Rath & T. K. Mahato

  2. Department of Metallurgical & Materials Engineering, Defence Institute of Advanced Technology (DU), Ministry of Defence, Girinagar, Pune, 411025, India

    Balasubramanian Kandasubramanian

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  1. Sushil S. Pawar
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Pawar, S.S., Baloji Naik, R., Rath, S.K. et al. Photoinduced hydrophilicity and self-cleaning characteristics of silicone-modified soya alkyd/TiO2 nanocomposite coating. J Coat Technol Res 17, 719–730 (2020). https://doi.org/10.1007/s11998-019-00253-y

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