| Titre : |
Low VOC topcoats using ultra high solids resins |
| Type de document : |
texte imprimé |
| Auteurs : |
Gautam Haldankar, Auteur ; Niel Pfendt, Auteur |
| Année de publication : |
2021 |
| Article en page(s) : |
p. 24-31 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Analyse thermomécanique dynamique
Evaluation
Formulation (Génie chimique)
Haut extrait sec
Polyacryliques
Polyols
Résistance chimique
Revêtements organiques
Solvants -- Suppression ou remplacement
Vernis
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
In the North American coatings market, traditional solventborne resins are still used to a large extent, enabled by regulations that allow for the use of certain solvents exempt from restrictions placed on most volatile organic compounds (VOCs) in the United States. The future of the exempt status of parachlorobenzotrifluoride (PCBTF) and tertiary butyl acetate (TBAc) is a concern in certain districts of California, and other regions may follow suit.
Coating companies are ramping up their research efforts in formulating paint without exempt solvents. Researchers are opting to formulate with high solids resins.
High-performance acrylic polyols were studied to understand the effect of various resin parameters on coatings performance. A set of resins with 80-90% solids was tested in pigmented topcoat formulations.
These topcoats contained VOCs ranging from 200 to 250 g/L, without the use of exempt solvents. Various conventional and advanced film properties were evaluated, including weathering performance by xenon arc exposure, cure kinetics using infrared (IR) spectroscopy, and crosslink density by dynamic mechanical thermal analysis (DMTA).
Correlation was obtained between coatings performance properties and resin characteristics such as equivalent weight, glass transition temperature, etc. The understanding of structure property correlation offers tremendous value not only for North American coatings researchers but also to the global community. |
| Note de contenu : |
- EXPERIMENTAL FINDINGS : Resin characteristics - Formulation and evaluation of clear films - Formulation of white topcoat - Evaluation of white topcoat
- RESULTS AND DISCUSSION : Disappearance of isocyanate by FTIR - Comparative film properties of white topcoat - Xenon weatherometer testing
- Table 1 : Characteristics of polyol resins
- Table 2 : Formulation guide to prepare clear film for DMTA analysis
- Table 3 : Formulation of white 2K topcoat with VOC ≤ 250 g/L
- Table 4 : Characteristics of formulated white topcoat
- Table 5 : Flexibility of the film after one month of cure
- Table 6 : Chemical resistance of ≤ 250 g/L white topcoats |
| En ligne : |
https://drive.google.com/file/d/1OWpp2GZYlpsNJzc2GeK5yE0_Yyzz7Zcm/view?usp=share [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36422 |
in COATINGS TECH > Vol. 18, N° 9 (09/2021) . - p. 24-31
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Low VOC topcoats using ultra high solids resins in COATINGS TECH, Vol. 18, N° 9 (09/2021)
