| Titre : |
Analytical approach for high quality appearance powder coatings |
| Type de document : |
texte imprimé |
| Auteurs : |
J. C. Kenny, Auteur ; T. Ueno, Auteur ; K. Tsutsui, Auteur |
| Année de publication : |
1996 |
| Article en page(s) : |
p. 35-43 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Coalescence (Sciences physiques)
Contraintes (mécanique)
Granulats
Réticulation (polymérisation)
Revêtements poudre:Peinture poudre
Taille des particules
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
High quality appearance of powder coatings was investigated using a five-stage model: (1) powder particle, (2) coalescence, (3) leveling, (4) curing, and (5) cooling. Appearance levels above target solvent-based systems were achieved using fine particle size and narrow distributions. Fine powders (∼10 μm) were found to have faster coalescence and better degassing. Cure contraction stress was much smaller than cool stress, yet caused significant image distortion due to localized gradients. Hardener crystals are a separate phase in the powder particles, a more uniform distribution of finer sized crystals gave improved appearance. Solutions to practical application of findings have been found. |
| Note de contenu : |
- EXPERIMENTAL: Material - Hardener crystal size - Powder production - Particle size analysis - Film preparation - Film appearance - Sprayed powder assessment - Powder tester - internal stress - Ring camera
- RESULTS AND DISCUSSION: Average particle size - SEM of sprayed powders - Coalescence of powders - SEM coalescence - Effects of distribution width - Coalescence and standard deviation - Distribution profile analysis - Cure/cool stress quantitative - Cure/cool stress qualitative - Effect of hardener size |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18321 |
in JOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 68, N° 855 (04/1996) . - p. 35-43
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