[article]
| Titre : |
The causes and prevention of titanium dioxide photodegradation of paints |
| Type de document : |
texte imprimé |
| Auteurs : |
Michael P. Diebold, Auteur |
| Année de publication : |
1995 |
| Article en page(s) : |
p. 294-299 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Tags : |
Peinture 'Dégradation photochimique' Feuil 'Pigment minéral' 'Titane oxyde' Prévention Durabilité TiO2 |
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
The photocatalytic degradation mechanism relies on many reactants en intermediates-UV radiation, oxygen, water, the electron and electron hole, various radical species and binder itself. In principe, any process which prevents one of these species from forming or reacting will increase paint durability. Some of these preventive measures are controlled during paint manufacture (for exemple, selection of binder type, the addition of radical scavengers and/or UV absorbers, and the use of UV absorbing clear coats). Others are considered in this report.
There are many ways which a pigment can be modified to diminish photocatalytic activity. These techniques can be divided into two broad categories : those which prevent electrons and/or electron holes from reaching the TiO3 surface and those which prevent the surface electron and electron holes from reacting to form radicals. Despite the large number of techniques available, only a few are effective, and fewer yet are used for commercial pigment production.
Electrons and/or electron holes can be kept from the TiO2 surface by preventing their formation or by immobilizing those which do form. We will begin by considering the former. |
| Note de contenu : |
- General
- Protection of titanium dioxide from UV light
- Increasing the band gap energy
- Electron and electron hole immobilization
- Electron and electron hole trapping and recombination
- Mediated surface recombination
- Removal of surface hydroxyl groups
- Encapsulation
- Monolayer coverage and site capping |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16974 |
in SURFACE COATINGS INTERNATIONAL > Vol. 78, N° 7 (07/1995) . - p. 294-299
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