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Optimizing the benefits of TiO2 in paints

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Abstract

TiO2 is found virtually in every coatings lab and manufacturing site around the world and is used in almost all paints. The primary role of TiO2 is to provide brightness and opacity, with a secondary role in many exterior paints of improving durability. The effectiveness of TiO2 as a brightener or opacifier is greatly affected by the specifics of the paint formulation and by the paint making process. This sensitivity can be understood in terms of the physics that govern light scattering. As for improving paint durability, TiO2 is an excellent UV light absorber and protects underlying resin from harmful UV radiation. However, this benefit can be offset by the formation of radicals at the TiO2/resin interface. This paper will focus on the formulation factors that affect the light scattering efficiency and the durability performance of TiO2 and techniques to optimize these properties.

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Notes

  1. This is somewhat of an overgeneralization. Scattering from particles close in size to the wavelength of light being scattered depends primarily on the physics of wave mechanics, rather than the macroscopic phenomena of reflection and refraction.

  2. Note that the refractive index of TiO2 changes over this wavelength range, and the appropriate value for each wavelength was used in these calculations.

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  1. Chemours Company, 974 Centre Road, CRP709-246, Wilmington, DE, 19805, USA

    M. P. Diebold

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Diebold, M.P. Optimizing the benefits of TiO2 in paints. J Coat Technol Res 17, 1–17 (2020). https://doi.org/10.1007/s11998-019-00295-2

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