| Titre : |
Singlet oxygen drying of alkyd resins and model compounds |
| Type de document : |
texte imprimé |
| Auteurs : |
J. C. Hubert, Auteur ; R. A. M. Venderbosh, Auteur ; W. J. Muizebelt, Auteur ; R. P. Klaasen, Auteur ; K. H. Zabel, Auteur |
| Année de publication : |
1997 |
| Article en page(s) : |
p. 59-64 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Haut extrait sec
Oxydation
Polyalkydes
Réactivité (chimie)
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
The drying behavior of air-drying high-solids paints (VOC<250 g/l) is different from and not as good as that of conventional paints. Research in relevant model compounds and alkyd paints has been initiated to gain insight in the underlying processes. After air-drying and aging, products whose formation could best be explained by assuming reaction with singlet oxygen were identified. Singlet oxygen can react with unsaturated systems in an efficient “ene” reaction to hydroperoxides. As hydroperoxides are essential in the air-drying process, an increased formation of singlet oxygen achieved by addition of (colored) sensitizers such as methylene blue and rose bengal should have a beneficial effect on alkyd drying. This effect was indeed found and appeared to be most pronounced at low temperatures. As a result the drying of high-solids alkyds and their corresponding paints is almost at the same rate as conventional products. |
| Note de contenu : |
- INTRODUCTION : The oxidative drying of alkyds
- EXPERIMENTAL : Auto-oxidation of (Z,Z)-3,6-nonadiene - Drying experiments of HS alkyds with photo-sensitizers - Drying experiments of Pigmented HS alkyds systems with photo-sensitizers - Color measurements on Pigmented HS alkyds with photo-sensitizers - Photo-oxidation of a methyl oleate/ethyl linoleate mixture - Auto-oxidation of a methyl oleate/ethyl linoleate mixture
-RESULTS AND DISCUSSION : Model compounds - Singlet oxygen - Photo-oxidation of linoleate versus oleate - Photo-oxidation and alkyd drying - Drying experiments using a BK recorder - Color measurements |
| Permalink : |
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in JOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 69, N° 869 (06/1997) . - p. 59-64
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