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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Water-based coatings for 3D printed parts / Jiayi Zhu 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. 889-897 Titre : Water-based coatings for 3D printed parts Type de document : texte imprimé Auteurs : Jiayi Zhu, Auteur ; Julia L. Chen, Auteur ; Robert K. Lade, Auteur ; Wieslaw J. Suszynski, Auteur ; Lorraine F. Francis, Auteur Année de publication : 2015 Article en page(s) : p. 889-897 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Dip-coating Impression tridimensionnelle Revêtements en phase aqueuse Rhéologie Surfaces (technologie) Surfaces -- Analyse Viscosimétrie Index. décimale : 667.9 Revêtements et enduits Résumé : Three-dimensional (3D) printing or additive manufacturing is an emerging technology that enables the exploration of new ideas and designs. The process converts a 3D digital model into a 3D object, allowing end users to hold and easily visualize their designs. Since 3D printed parts are built through layer-by-layer deposition, they exhibit limited surface smoothness and surface quality. By applying water-based coatings onto 3D printed parts, surface quality can be improved by reducing surface roughness and by sealing surface gaps without deforming the parts themselves. In this study, water-based coatings were applied to 3D printed parts using a computer-controlled dip coater. Surface profiles of 3D printed parts before and after dip coating were measured using a profilometer and parts were examined with optical microscopy. Two commercial water-based coating systems were evaluated, and the effect of coating speed, drying conditions, and number of coated layers on surface roughness of 3D printed parts was studied. The effect of printing with different print tips and in different orientations on surface roughness before and after coating was also studied. Coating liquids with higher solids loading were found to be most effective at smoothing or planarizing the 3D printed part surface. Note de contenu : - EXPERIMENTAL METHODS AND MATERIALS : Materials - Coating preparation - viscosity measurements - Surface characterization - RESULTS AND DISCUSSION : Rheology of the coating solutions - Surface morphology of 3D printed parts before coating - Surface morphology of 3D printed parts after coating DOI : 10.1007/s11998-015-9710-3 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9731-y.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24689 [article]

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