| Titre : |
The lasting impact of titanium dioxide : A better understanding of how TiO2 affects powder-coat weathering |
| Type de document : |
texte imprimé |
| Auteurs : |
Johan J. Rommens, Auteur ; Steven de Backer, Auteur ; P. Gijsman, Auteur ; Leendert Molhoek, Auteur |
| Année de publication : |
2020 |
| Article en page(s) : |
p. 30-36 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Brillance (optique)
Dioxyde de titane
Essais accélérés (technologie)
Polyesters
Résistance aux conditions climatiques
Revêtements -- Détérioration:Peinture -- Détérioration
Revêtements organiques
Revêtements poudre
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
Choosing the right method to evaluate weathering is important for the development of durable, high-quality coatings. Accelerated test methods often lead to the wrong conclusions. |
| Note de contenu : |
- Titanium dioxide for durability
- Weathering tests indispensable
- Accelerated measurement of weathering resistance in paints
- Pathways to degradation
- Outdoors is best
- Accelerated is risky
- Experimental
- Influence of TiO2 on weathering resistance
- Comparison of accelerated weathering methods
- Don't jump to conclusions
- Understanding photo-degradation
- It's wetter in Florida
- More photolysis in Florida
- Rate of degradation initiation is key
- Table 1 : Weathering requirements according to GSB
- Fig. 1 : Gloss retention of powder coat after 1000 h Q-UVB exposure
- Fig. 2 : Gloss retention of powder coat after 1000 h WOM (xenon) exposure
- Fig. 3 : Gloss retention of powder coat after 5 years' Florida exposure
- Fig. 4a : Correlation between QUV-B exposure and Florida exposure (GSB "standard class"). GR = Gloss retention
- Fig. 4b : Scatterplot of QUV GR 600 hours vs Florida GR three years
- Fig. 5a : Correlation between WOM and Florida testing (class 1 qualicoat)
- Fig. 5b : Scatterplot of xenon GR 1000 hours vs Florida GR three years
- Fig. 6 : Measured (points) and calculated (lines loss of gloss as a function of time in TiO2-pigmented, Primie-445 crosslinked polyester powder coatings of variable isophthalic-terephthalic ester rations and weathered according to ASTM D7869, ISO 11341, ASTM G-53 and Florida
- Fig. 7 : Weight loss (wt. %) under lab conditions of water-saturated coatings 1 and H (6h at 40°C in liquid water)
- Fig. 8 : Measured and calculated of loss og gloss over time in Florida of a Primid XL552-crosslinked polyester powder coating (P800) containing different TiO2 types (calculated lines for C2, C3 and C10 as well as for C1 ; C7 and C6 overlap)
- Fig. 9 : k1 values calculated for the different TiO2 types, relative to the value of coatings made with C7 |
| En ligne : |
https://drive.google.com/file/d/1FyeVmJ63vHPjeZjkEtUOgZD2OdgjSd_c/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33920 |
in EUROPEAN COATINGS JOURNAL (ECJ) > N° 4 (04/2020) . - p. 30-36
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