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Surface study of DWA‐wetted TiO~2~ pigments by Leena-Sisko Johansson; Tuomo Losoi; Jyrki Juhanoja is a Engineering article available to read on EtoBox.

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## Abstract We present a study on the dispersion of coated TiO~2~ pigments in acrylic‐isocyanate automotive paints, based both on the surface characterization of the pigment particles and on studies of the films prepared from the paint. We investigated how the Al~2~O~3~–SiO~2~ coating on TiO~2~ affects the adsorption of an organic dispersing and wetting agent (DWA) and what the effect of this surfactant is on the dispersibility of the pigment. The study also shows the value of surface methods in the characterization of powder surfaces. Five Al~2~O~3~‐ and/or SiO~2~‐ coated TiO~2~ pigment samples were used as substrates. These were treated with varying amounts of a commercial organic DWA. The substrate surfaces were characterized with XPS and zeta potential measurements prior to the DWA treatment. The adsorption of the surfactant was analysed with carbon analysis, UV and IR spectroscopies, XPS techniques and with static SIMS. Results from both the XPS analyses and adsorption measurements showed that the substrate saturation point for DWA depended on the pigment surface, owing to variations in substrate acidity. The effect of the DWA treatment on pigment dispersion was studied in pai

Who reads Surface study of DWA‐wetted TiO~2~ pigments?

Author

Leena-Sisko Johansson; Tuomo Losoi; Jyrki Juhanoja

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; Wiley; Research Square (ISSN 0142-2421)

Published

1993

Language

EN

Field

Engineering (Physical Sciences)