| Titre : |
Expanded applications and enhanced durability of alkyd coatings using high-performance catalysts |
| Type de document : |
texte imprimé |
| Auteurs : |
Joshua Halstead, Auteur |
| Année de publication : |
2023 |
| Article en page(s) : |
p. 42-55 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Catalyseurs
Cobalt
Essai de dureté
Essais accélérés (technologie)
Essais de résilience
Formulation (Génie chimique)
Nettoyabilité
Polyacryliques
Polyalkydes
Réticulants
Revêtements -- Analyse
Revêtements organiques
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
Alkyd-based coatings cure via both physical and chemical drying processes. The natural drying time of an alkyd can be weeks to months, which is not desirable from a practical point of view. In practice, the chemical crosslinking process is accelerated using catalysts, commonly referred to as driers. Generally, these are transition metal complexes with organic ligands. The most widely known and commonly used driers are based on cobalt carboxylates. While cobalt driers lead to highly crosslinked hard films, cobalt-based siccatives have recently faced reclassification as class 1b carcinogens by the Cobalt REACH consortium,1 a nonprofit group tasked with preparing the registration dossiers for cobalt and cobalt compounds. As a carcinogen, cobalt that is used to cure coatings and inks can be a risk to human health as humans can be in frequent contact with these substances (especially when applying paints or scraping off old paint layers). Many regions recognize that the use of cobalt in this industry must be reduced as part of a movement toward a sustainable future. |
| Note de contenu : |
- Dry times - Hardness testing
- Scrub testing
- Washability testing
- Blocking test
- Corrosion testing
- Accelerated weathering
- GC/MS
- FTIR testing
- Table 1 : Resins used in trim paint formulations
- Table 2 : Optimized high-performance catalyst (HPC) formulations
- Table 3 : Optimized cobalt and acrylic formulations
- Table 4 : Dry times in hours for evaluated systems
- Table 5 : König hardness results conducted in standard conditions (23 °C and 50% relative humidity)
- Table 6 : Numerical washability results, ΔE
- Table 7 : b* Values after 336 hours QUV exposure
- Table 8 : 60° Gloss values after 336 hours QUV exposure
- Table 9 : Resin 1 emissions
- Table 10 : Resin 3 emissions
- Fig. 1 : Bispidon structure, dimethyl 3-methyl-9-oxo-2,4-di(pyridin-2-yl)-7-(pyridin-2-ylmethyl)-3,7-diazabicyclo[3.3.1]nonane-1,5-dicarboxylate
- Fig. 12 : Model representation of the oxidative drying pathway for an alkyd polymer |
| En ligne : |
https://drive.google.com/file/d/1gFjt6qr92gc3vNXmESc0PkQWTtFaO9Jx/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39424 |
in COATINGS TECH > Vol. 20, N° 3 (05-06/2023) . - p. 42-55
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Expanded applications and enhanced durability of alkyd coatings using high-performance catalysts in COATINGS TECH, Vol. 20, N° 3 (05-06/2023)
