| Titre : |
Organic vs inorganic light stabilizers for waterborne clear coats : a fair comparison |
| Type de document : |
texte imprimé |
| Auteurs : |
Christian Schaller, Auteur ; Daniel Rogez, Auteur ; Adalberg Braig, Auteur |
| Année de publication : |
2012 |
| Article en page(s) : |
p. 433-441 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Absorbeurs de rayonnement ultraviolet
Bois -- Revêtements protecteurs
Dioxyde de titane
Oxyde de cérium
Oxyde de zinc
Photoprotection
Photostabilité
Pins et constituants
Revêtements -- Coloration:Peinture -- Coloration
Stabilisants (chimie)
Vernis en phase aqueuse
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
As a consequence of regulatory pressure to reduce solvent emissions, there is high growth rate of “compliant technologies” such as waterborne (WB) coatings. However, a change from conventional solventborne (SB) to WB technologies should not compromise the protective function of the coatings and the used raw materials. The use of light stabilizers, such as UV absorbers (UVA) and hindered amine light stabilizers (HALS) are state-of-the-art and largely improve the coating durability and service lifetime. Today in the case of UVA one has to differentiate between inorganic and organic products: the most widely used organic UVA for coating applications are 2-(2-hydroxyphenyl)-benzotriazole (BTZ) and 2-hydroxyphenyl-s-triazine (HPT) derivatives. Inorganic products are ideally nano particulate materials—so-called mineral screeners (MS)—comprised of titanium dioxide (TiO2), zinc oxide (ZnO), or cerium oxide (CeO2). The challenge here is to convert existing products which are in general hydrophobic substances into product forms that enable easy incorporation and unproblematic dispersion into WB systems. This article describes UV absorbers which are commercially available for waterborne coatings. Different classes are tested with regard to their protective function in joinery coatings as well as with regard to their influence on coatings color and transparency. The findings of this study showed clearly that the 2-hydroxyphenyl-s-triazine class outperforms all other UVA in terms of long-term performance without influencing initial coating properties. |
| Note de contenu : |
- INTRODUCTION : Properties of UVA - UVA for waterborne applications - Novel encapsulated additives technology
- RESULTS : Photohysical properties : transmittance or light filter effect - Visual appearance of coatings - Photophysical properties : UVA photopermanence and long-term photoprotection effect |
| DOI : |
10.1007/s11998-011-9380-8 |
| En ligne : |
https://link.springer.com/content/pdf/10.1007%2Fs11998-011-9380-8.pdf |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16001 |
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 9, N° 4 (07/2012) . - p. 433-441
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Organic vs inorganic light stabilizers for waterborne clear coats : a fair comparison in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 9, N° 4 (07/2012)
