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Novel acrylic polymer for architectural exterior paint and primer in one coatings application / Kaliappa Ragunathan in COATINGS TECH, Vol. 15, N° 2 (02/2018)  

[article]  inCOATINGS TECH > Vol. 15, N° 2 (02/2018) . - p. 30-37 Titre : Novel acrylic polymer for architectural exterior paint and primer in one coatings application Type de document : texte imprimé Auteurs : Kaliappa Ragunathan, Auteur ; Punit Thakkar, Auteur Année de publication : 2018 Article en page(s) : p. 30-37 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosion Essais accélérés (technologie) Formulation (Génie chimique) Polyacryliques Résistance à l'efflorescence Résistance à l'humidité Résistance à la salissure Résistance au nettoyage Résistance chimique Revêtements -- Propriétés mécaniques:Peinture -- Propriétés mécaniques Revêtements en bâtiment:Peinture en bâtiment Revêtements en phase aqueuse:Peinture en phase aqueuse Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : Architectural exterior coatings are subject to the harsh elements of the environment. Careful consideration must be paid to these harsh conditions to overcome deleterious effects of these elements. The novel polymer developed using innovative polymer engineering has outstanding performance for paint and primer in one exterior coatings application. This polymer can be used to formulate <25 g/l VOC coatings. A benchmark study involving market leading competitive binders shows that the novel polymer outperforms in DPUR, leaching resistance, tannin blocking, efflorescence resistance, scrub resistance, corrosion resistance, gloss retention, and tint strength. Natural weathering shows excellent results at 36 months of testing. Note de contenu : - FACTORS IMPACTING CRITICAL PERFORMANCE FEATURES : Dirt pick-up resistance (DPUR) - Conflicting demands : film formation at low VOC and DPUR - Leaching resistance - Tannin blocking and efflorescence resistance - Grain crack resistance - NOVEL POLYMER - EXPERIMENTAL : Dirt pick-up resistance - Surfactant leaching - Efflorescence resistance - Early rain resistance - Tannin blocking - Corrosion resistance - RESULTS AND DISCUSSION : Dirt pick-up resistance - Surfactant resistance - Early rain resistance - Tannin blocking - Efflorescence resistance - Corrosion resistance - Paint film mechanical properties - Accelerated weathering - Natural weathering - FIGURES : 1. Film formation in emulsion polymrs - 2. Leaching in exterior wall - 3. More dirt in leached trail - 4. Tannin migration from redwood to coatings. Superior performing polymers (green box) block tannin migration, as compared to one coat of an inferior paint (red box) where the brown color of the tannin migrates through - 5. Efflorescence on concrete surface - 6. Coatings on southern yellow pine boards showing both poor (red box) and excellent grain crack resistance - 7. Dirt pick-up resistance - 8. DPUR (carbon black and red iron oxide dispersions) - 9. Leaching resistance rating - 10. Early rain resistance - 11. Redwood tannin blocking - 12. Redwood tannin blocking - 13. Efflorescence resistance - 14. Corrosion resistance of cold rolled steel - 15. Gloss change in accelerated weathering study (UV-A radiation) - 16 Spider diagram comparing performance of the coatings - TABLES : 1. Novel polymer physical properties - 2. White flat formulation - 3. White flat formulation physical characteristics - 4. Paint properties - 5. Mechanical properties of white flat paints - 6. Color change ΔE in accelerated weathering study (UV-A radiation) - 7. Natural weathering results at 36 months of testing En ligne : https://drive.google.com/file/d/1EXffywNJYoGhj7IIy44-nEJOH7ntkhOz/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30052 [article]

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How to handle hard-to-change factors or components in a design experiment / Mark J. Anderson in COATINGS TECH, Vol. 15, N° 2 (02/2018)  

[article]  inCOATINGS TECH > Vol. 15, N° 2 (02/2018) . - p. 46-49 Titre : How to handle hard-to-change factors or components in a design experiment Type de document : texte imprimé Auteurs : Mark J. Anderson, Auteur Année de publication : 2018 Article en page(s) : p. 46-49 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Plan d'expérience Index. décimale : 658.56 Contrôle de la production. Contrôle de la qualité, emballage Résumé : The traditional approach to experimentation—often referred to as the "scientific rnethod"—requires chang¬ing only one factor at a time (OFAT). Unfortunately, the relatively simplistic OFAT approach falls flat when users are faced with factor or component interactions, for example, the combined impact of time and temperature on a process, or two reactants in a mixture. Because inter¬actions abound in the coatings industry, the multifactor and multicomponent test matrices provided by the design of experiments (DOE) approach appeal greatly to process engineers and formulators.' However, carrying out DOE correctly réquires that runs be randomized whenever possible to counteract the bias that may be introduced by time-related trends, such as aging of materials, increasing humidity, and the like. But what if complete randomization proves to be sa inconvenient that it becomes impossible ta run a statisti¬cally designed experiment? In this case, a specialized form of design called "split plot" becomes attractive, because of its ability to effectively group hard-to-change (HTC) factors.' A split plot accommodates bath HTC factors, for instance, the conditions in an electrostatic powder-coating chamber. and those factors that are easy to change (ETC), such as the part precleaning and preparation. Note de contenu : - Case in point : the use of a split plot in an industrial experiment - Combines mixture-process experiments made far easier - Caveats - Closing thoughts - FIGURES : 1. Comparing a completely randomized experiment (vs one that is divided into split plots - 2. In this effect graph, 3D bars show the impact of temperature vs coating on corrosion resistance - the higher the better - 3. Three component mixture combined with one process factor - 4. Split plot for grouping blends and then processing them - TABLE : Using a split-plot design to increase the corrosion resistance of steel bars En ligne : https://drive.google.com/file/d/1NGjRsxr81PHndVi-qPd624QryQwep2vG/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30053 [article]

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Coatings Tech Vol. 15, N° 2 URL