Evaluating sag resistance with a multinotched applicator : correlation with surface flow measurements and practical recommendations / Robert K. Lade in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 5 (09/2015)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 12, N° 5 (09/2015) . - p. 809-817 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 [article]

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