Alumina Surface Treated Pigmentary Titanium Dioxide with Suppressed Photoactivity

N. Veronovski; M. Lesnik; D. Verhovsek

doi:10.6000/2369-3355.2014.01.01.6

Authors

N. Veronovski Cinkarna-Metallurgical and Chemical Industry Celje, Inc., Kidričeva 26, 3001 Celje, Slovenia
M. Lesnik Cinkarna-Metallurgical and Chemical Industry Celje, Inc., Kidričeva 26, 3001 Celje, Slovenia
D. Verhovsek Cinkarna-Metallurgical and Chemical Industry Celje, Inc., Kidričeva 26, 3001 Celje, Slovenia

DOI:

https://doi.org/10.6000/2369-3355.2014.01.01.6

Keywords:

Titanium dioxide, Surface treatment, Coatings, Alumina, Photo activity

Abstract

The aim of the optimization of the technological process was to coat the surface of the pigment in a controlled manner and to supress photoactivity in the titanium dioxide (TiO₂) pigment. As part of this research, a systematic approach to TiO₂ pigment surface treatment with alumina was conducted. Surface treatment with alumina plays a significant role in the improvement of TiO₂ properties (e.g. weather resistance and photostability). This research encompasses a raw material analysis and process conditions study. Sodium aluminate and aluminium sulphate were used as a source of alumina hydroxide. The effectiveness of surface treatment was determined using scanning-transmission (STEM) and transmission (TEM) electron microscopy. The photoactivity of pigmentary TiO₂ was determined before and after surface treatment. A controlled surface treatment process resulted in pigmentary TiO₂ particles with uniform amorphous layers, which supressed the photoactivity of the pigment.

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