Leaching in facade paints / Dorothee Gabel in EUROPEAN COATINGS JOURNAL (ECJ), N° 2 (02/2019)  

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 2 (02/2019) . - p. 90-94 Titre : Leaching in facade paints : Prevent "snail trails" with novel additves - and find out what causes them Type de document : texte imprimé Auteurs : Dorothee Gabel, Auteur ; Jörg Rüger, Auteur Année de publication : 2019 Article en page(s) : p. 90-94 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Agents dispersants (chimie) Analyse qualitative (chimie) Analyse quantitative (chimie) Chromatographie en phase liquide à hautes performances Formulation (Génie chimique) Liants Lixiviation Revêtements -- Additifs:Peinture -- Additifs Revêtements -- Analyse:Peinture -- Analyse Revêtements -- Défauts:Peinture -- Défauts Revêtements en bâtiment:Peinture en bâtiment Index. décimale : 667.9 Revêtements et enduits Résumé : Façade paint can leach when water condenses on freshly dried painted walls, leaving behind shiny vertical "snail trails" that alter and deteriorate the façade's appearance. To date, predicting a paint formulation's tendency towards leaching is difficult, because the phenomenon is poorly understood, and no standardised analytical methods exist. A newly-developed test method can mimic leaching conditions and help in studying the influence of paint ingredients on the occurrence of snail trails. In addiction, we devised a new polymeric dispersant that is resistant to leaching to aid formulators. Note de contenu : - Novel test methods hepl to track down the source of the snail trails - Qualitative test - does the paint formulation develop snail trails? - Illustrating the pratical use of the test: various binders in a paint formulation - Quantitative test: finding the root cause of leaching in a paint - Case study: dispersant - Fig. 1 : Preparing the foil and foil including pockets in a Kesternich chamber - Fig. 2 : Microscope image of a snail trail on the surface of the panel - Fig. 3 : Images of Binder 2, showing film-forming residue in the pocket, shiny "snail trails" by microscope and shiny still trails on the foil surface - Fig. 4 : Modified aquarium with a cold-water vapour condenser attached to it to studt leaching - Fig. 5 : HPLC traces of the surfactant type dispersant as standard versus in the paint - Table 1 : Simplified paint formulation for leaching tests - Table 2 : Binders studied in the qualitative test - Table 3 : Pigment paste formulation En ligne : https://drive.google.com/file/d/1yg2ubmAMcjyIBO6O08eN7S0HwoYWpEfc/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31680 [article]

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