[article]
| Titre : |
UV curing of black pigmented coating materials |
| Type de document : |
texte imprimé |
| Auteurs : |
Norbert Pietschmann, Auteur ; Ilse Peter, Auteur ; Peter Stroh, Auteur |
| Année de publication : |
2000 |
| Article en page(s) : |
p. 44-52 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
Black pigmented UV-curable coating materials intended for application on wood veneer and fibreboard were prepared and used to compare different compositions, e.g., varying pigments. Reactive oligomer/monomer combinations with high acrylate functionality and, thus, an intense chain propagation reaction, a suitable and effective blend of long-wave and short-wave absorbing photoinitiators, and a careful pigment selection as well as a careful adjustment of pigment concentration were necessary to make possible both opacity and through cure. In this context, the combination of the black pigment with certain extenders can be helpful.
On wooden substrates good results were achieved with both a carbon black of larger particle size, and aniline black (at ten times the pigment content). In contrast, formulations containing a standard fluffy carbon black (which gives very good colour strength and jetness in conventional and water-borne coatings) failed with respect to curability. However, formulations with aniline black also showed excellent jetness and brilliancy. |
| Note de contenu : |
1. The experiments at a glance
2. Introductory investigations and formulation principles
3. Improvements of formulations : Influence of the formulation on through cure and surface cure - Oxygen inhibition can lead to poor scratch resistance - Good results can be obtained when extenders are added - Attempts to find an optimised photoinitiator system
4. In conclusion - problems can be solved, with some limitations |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11016 |
in EUROPEAN COATINGS JOURNAL (ECJ) > N° 7-8/00 (07-08/2000) . - p. 44-52
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