Development of an accelerated test method for dirt pick-up resistance / Daniel C. Kraiter in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 5 (09/2021)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 5 (09/2021) . - p. 1413-1430 Titre : Development of an accelerated test method for dirt pick-up resistance Type de document : texte imprimé Auteurs : Daniel C. Kraiter, Auteur ; Scott C. Brown, Auteur ; Michael P. Diebold, Auteur ; Peter Jernakoff, Auteur ; Alan F. Vera-Balbuena, Auteur Année de publication : 2021 Article en page(s) : p. 1413-1430 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésion thermique Caractérisation Concentration pigmentaire volumique Essais accélérés (technologie) Liants Résistance à la salissure Revêtements en bâtiment:Peinture en bâtiment Transition vitreuse Index. décimale : 667.9 Revêtements et enduits Résumé : Dirt pick-up is a long-standing issue for exterior architectural coatings. Dirt pick-up resistance (DPR) is highly sought by end users, and significant resources have been committed by paint manufacturers to improve it. The task is complicated by the multitude of regional and local factors such as seasonal weather, intensity of economic activity, or atmospheric particle burden. Typically, paint manufacturers try to control DPR via careful selection of additives and formula optimization. Testing the new formulas in real time is long and, therefore, there is a clear need for a faster and more reliable test that takes into account the key elements of the dirt pick-up mechanism: particle transport, adhesion, and release to/from the surface. Our team has developed an accelerated test that focuses on thermally driven adhesion and takes a fraction of the time necessary for outdoor exposure testing. The test correlates well with early outdoor exposure results when formulation parameters are controlled and when there are moderate-to-large performance differences among paint formulas. The test was used to improve the accelerated DPR of a paint formula, which subsequently was verified against real-time outdoor exposure in three geographic regions with different climates and airborne particulate pollution levels. Note de contenu : - Table 1 : Outdoor exposure sites and conditions - Table 2 : Composition and characterization of polymeric binders - Table 3 : Composition of paints having binders with different Tg values - Table 4 : Coefficients of correlation between outdoor exposure (several months) and accelerated test method (using twenty-four dusting events) for the binder Tg series - Table 5 : Composition of paints having different PVCs - Table 6 : Coefficients of correlation between outdoor exposure (several months) and accelerated test method (using twenty-four dusting events) for the PVC series - Table 7 : Commercial paints (and selected properties) used for the comparison of outdoor exposure and accelerated test - Table 8 : Impact of crosslinking on film properties - Table 9 : Paint variables evaluated in the experimental design DOI : https://doi.org/10.1007/s11998-021-00506-9 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00506-9.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36443 [article]

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Towards a comprehensive understanding of dirt pickup resistance / Scott C. Brown in COATINGS TECH, Vol. 17, N° 6 (06/2020)  

[article]  inCOATINGS TECH > Vol. 17, N° 6 (06/2020) . - p. 14-27 Titre : Towards a comprehensive understanding of dirt pickup resistance Type de document : texte imprimé Auteurs : Scott C. Brown, Auteur ; Michael P. Diebold, Auteur ; Daniel C. Kraiter, Auteur ; Carlos Velez, Auteur ; Peter Jernakoff, Auteur Année de publication : 2020 Article en page(s) : p. 14-27 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Applications extérieures Encrassement Essais accélérés (technologie) Evaluation Revêtements:Peinture Surfaces (technologie) Index. décimale : 667.9 Revêtements et enduits Résumé : The fouling of exterior coating surfaces by dirt is no simple matter. The process is complex, dynamic, and varies in length and time. It also includes a range of confounding particle transport, attachment, and release mechanisms. While complex, strategic, multiscale testing and analysis combined with particle and surface science fundamentals can be used to isolate the dominant mechanisms. In this article, fundamental concepts in surface and particle science as they relate to dirt pickup resistance are presented. We demonstrate how these concepts were applied to develop a failure-mode-targeted accelerated test method resulting in good correlations with outdoor exposure data. We further examine the impact of microscale and nanoscale surface features on the fouling mechanism through direct surface interaction measurements and imaging on commercial coating surfaces. A path forward towards development of a comprehensive, yet practical understanding of dirt pickup resistance is proposed. Note de contenu : - MECHANISMS OF DIRT PICKUP : Deposition - Adhesions and entrenchment - Particle shedding and release - EXPERIMENTAL : Materials (dirt simulants - Paint panels - Commercial paints) - Methods (Outdoor exposure testing - Aerosolized carbon black deposition - Grayscale evaluation - Dirt simulant deposition evaluation - Evaluation of precipitation/water-induced surface creep - Particle shedding assessment of films deposited by aerosol En ligne : https://drive.google.com/file/d/15csF7rv71WGpV8AR9JT9E02zoHXOmqbd/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34356 [article]

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