| Titre : |
Functional powder coatings via isocyanate-cured phenolics and benzoxazines |
| Type de document : |
texte imprimé |
| Auteurs : |
Weih Lee, Auteur ; Robert Polance, Auteur ; Hart Haugen, Auteur |
| Année de publication : |
2020 |
| Article en page(s) : |
p. 16-23 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Analyse mécanique dynamique
Benzoxazine
Calorimétrie
Formulation (Génie chimique)
Isocyanates
Phénols
Polyuréthanes
Revêtements anti-graffitis
Revêtements poudre
Rhéologie
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
In this work centering around phenolic chemistry, we investigated isocyanate and benzoxazine-modified phenolic powder coatings for use in anti-graffiti applications and for addressing downhole drill pipe interior coating challenges. Allied polyurethane formulations were developed using phenolic hydroxyl-isocyanate reactions and shown to outperform conventional aliphatic polyol-isocyanate coatings for graffiti-resistant applications. Effects of variables like phenol hydroxyl equivalent weights and molecular weights of phenolic resins were examined. In a separate effort intended for oil and gas downhole pipe interior lining applications, novel fusion-bonded benzoxazine-epoxy-phenolic formulations, without or with an acid catalyst, exhibited excellent adhesion, toughness, and process-ability, in addition to greatly reducing cure requirements as compared to benzoxazine self-polymerization. Applicable rheology and kinetics of cure were quantified, revealing characteristic flow and cure behaviors to strengthen the understanding of structure-property relationships and to facilitate efficient optimization of coating performance. |
| Note de contenu : |
- MATERIALS AND METHODS : Dynamic mechanical analysis and differential scanning calorimetry - Physycal testing
- RESULTS AND DISCUSSION : Phenolic PU - Fusion bonded benzoxazines
- Fig. 1 : Chemical structure of BPA-derived phenolic resins
- Fig. 2 : Simplified benzoxazine self-crosslinking
- Fig. 3 : Chemical structure and basic properties of BOX80
- Fig. 4 : Di-functional BPA phenolic resins and internally blocked IPDI dimers were reacted to yield a thermosetting PU
- Fig. 5 : Taber abrasion weight losses
- Fig. 6 : Rheological DMA profiles for UO-D8
- Fig. 7 : DSC exothermic curves and kinetic data
- Fig. 8 : Rheological DMA profiles for BOX80 self-crosslinking
- Table 1 : Formulation matrix and physical properties
- Table 2 : Complete kinetics and cure schedules |
| En ligne : |
https://drive.google.com/file/d/17EjEnXJZc80tkHpeRfLrIV1RFYHJmg9j/view?usp=share [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34341 |
in COATINGS TECH > Vol. 17, N° 7 (07/2020) . - p. 16-23
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