Fading mechanism of paint films composed of insoluble azo pigment and titanium dioxide.

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概要

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• The fading mechanism of paint films comprising an insoluble azo pigment and titanium dioxide was investigated using ESR and FT-IR spectrometers and the results of outdoor exposure tests. Some paramagnetic species were found in paint films at room temperature. They showed no hyperfine structure and their <I>g</I>-values drastically changed according to sample preparation, the measurement temperature and treatments with a base or acid. These paramagnetic species are proposed to be O<SUB>2</SUB><SUP>−</SUP> in an adsorbed state on a TiO<SUB>2</SUB> surface and O<SUP>−</SUP> of the TiO<SUB>2</SUB><SUP>+</SUP>. It is suggested that film fading occurs through an attack of these active oxygens on the insoluble azo pigment.

• 公益社団法人 日本化学会の論文

著者

• Ohya-Nishiguchi Hiroaki

  Department of Chemistry, Faculty of Science, Kyoto University

• Okamoto Shingo

  Nippon Oil & Fats Co., Ltd., Totsuka Factory

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