| Titre : |
Evaluating sag resistance with a multinotched applicator : correlation with surface flow measurements and practical recommendations |
| Type de document : |
texte imprimé |
| Auteurs : |
Robert K. Lade, Auteur ; Austin D. Musliner, Auteur ; Christopher W. Macosko, Auteur ; Lorraine F. Francis, Auteur |
| Année de publication : |
2015 |
| Article en page(s) : |
p. 809-817 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Caractérisation
Ecoulement bidimensionnel
Essais (technologie)
Latex
Racle
Résistance à l'écoulement
Revêtements:Peinture
Rhéologie
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
Sag is a coating defect that results from excessive, gravity-driven flow after deposition. Accordingly, characterizing resistance to sag is critically important. In this paper, sag resistance predicted using a multinotched applicator test is compared with results obtained using an in situ particle tracking technique that measures surface velocity. Four commercial latex paints dried on substrates inclined at three angles were investigated. The results are used to provide insight into the strengths and limitations of using a multinotched applicator to evaluate sag resistance. For coatings dried on vertical surfaces (90°), the suggested condition for the multinotched applicator, sag lengths found by particle tracking show differences between paints that the multinotched applicator ranked as identical. At smaller angles (e.g., 10°), the resolution of the multinotched applicator test is greatly enhanced owing to a reduction in the shear stress difference between adjacent coated lines. Based on these results, specific recommendations are made for successfully employing a multinotched applicator to evaluate sag resistance based on user-specific goals. |
| Note de contenu : |
- Materials
- Anti-Sag Meter testing
- Rheological characterization of latex paints
- Sag length, initial wet film thickness, and evaporation rate measurements |
| DOI : |
10.1007/s11998-015-9680-5 |
| En ligne : |
https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9680-5.pdf |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24679 |
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 12, N° 5 (09/2015) . - p. 809-817
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Evaluating sag resistance with a multinotched applicator : correlation with surface flow measurements and practical recommendations in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 5 (09/2015)
