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Waterborne direct-to-metal coatings / Leo J. Procopio in COATINGS TECH, Vol. 19, N° 6 (07/2022)  

[article]  inCOATINGS TECH > Vol. 19, N° 6 (07/2022) . - p. 16-22 Titre : Waterborne direct-to-metal coatings : Enduring solutions in corrosion protection Type de document : texte imprimé Auteurs : Leo J. Procopio, Auteur Année de publication : 2022 Article en page(s) : p. 16-22 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosifs Anticorrosion Application directe sur le métal Formulation (Génie chimique) Métaux -- Revêtements protecteurs Polyacryliques Revêtements en phase aqueuse:Peinture en phase aqueuse Index. décimale : 667.9 Revêtements et enduits Résumé : Corrosion is a process where a refined metal, such as aluminum or iron or alloys such as steel, undergoes degradation. In scientific terms, corrosion is an electrochemical process leading to oxidation of the metal and returning it to its natural state, such as iron being converted to iron oxides. Electrochemical reactions eat away at the underlying metal substrate, sometimes degrading it to such an extent that it creates aesthetic, mechanical, or structural failures. The economic impact of corrosion is enormous. In a recent report, corrosion was estimated to cost the global economy more than $2.5 trillion annually, or approximately 3.4% of global gross domestic product (GDP).1 Preventing corrosion is clearly an important goal, and paints and coatings play an important role in this never-ending battle. Coatings applied to metal substrates can have a variety of purposes, including the enhancement of aesthetics such as gloss and color, or various functional purposes such as thermal insulation, sound dampening, or antimicrobial properties. However, in many cases the most important role of a coating on a metal substrate is protection of the metal surface from the environmental effects that lead to corrosion. Waterborne direct-to-metal (DTM) coatings are just one category of coatings designed to protect metal substrates. We begin by considering the science behind the corrosion process and the methods by which a coating can prevent corrosion. Then we will examine what is meant by direct-to-metal and how the term “DTM coating” is typically discussed in the industry, followed by a description of one-component (1K) DTM coatings based on acrylic latex polymers, which are the most common type of waterborne DTM coatings. We will also discuss principles of formulating waterborne acrylic DTMs for maximum performance over metal substrates. Finally, we will present a twopart, roundtable Q&A, where industry experts discuss the current trends and technology advances. Note de contenu : - The science of corrosion - Defining direct-to-metal (DTM) coatings - Waterborne acrylic DTM coatings - Formulating wqterborne acrylic DTM coatings - Table 1 : Formulation for a waterborne gloss white DTM coating based on an acrylic latex polymer En ligne : https://drive.google.com/file/d/1JC5QNAb4vQ5K2Bp5P0f5tYY2LcnIUx7J/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38223 [article]

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Novel natural additives for surface coatings / Richard Czarnecki in COATINGS TECH, Vol. 19, N° 6 (07/2022)  

[article]  inCOATINGS TECH > Vol. 19, N° 6 (07/2022) . - p. 30-37 Titre : Novel natural additives for surface coatings Type de document : texte imprimé Auteurs : Richard Czarnecki, Auteur Année de publication : 2022 Article en page(s) : p. 30-37 Langues : Américain (ame) Catégories : Biomatériaux Cires végétales Polyacryliques Polyuréthanes Ressources renouvelables Revêtements -- Additifs Revêtements en phase aqueuse -- Additifs Revêtements organiques Riz et constituants Index. décimale : 667.9 Revêtements et enduits Résumé : Many additives used in the coatings industry are based on synthetic petroleum-derived raw materials. As concerns grow regarding the sustainability, naturality, and biodegradability of coatings, formulators are beginning to consider replacing non-renewable formula ingredients with alternate additives based on natural and sustainable chemistries. This article reviews several new developments in natural additive powders and emulsions that offer a more favorable environmental profile while also demonstrating excellent performance properties. Note de contenu : - Wax additive technology - Classic biobased waxes - New biobased wax technologies : nanocomposites : 1. Hydrogenated castor oil powder - 2. Rice bran wax powder - PHBV - Rice bran wax emulsion - Formula 1 : Soft urethane (PUD) coating - Formula 2 : Hard urethane (PUD) coating - Formula 3 : Acrylic paint En ligne : https://drive.google.com/file/d/1hTNh9mwrm1sh2FPixF0eBkykVKSnpmz-/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38224 [article]

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ASTM accelerated dirt pickup resistance method with correlation to natural outsdoor weathering / Keith Alderfer in COATINGS TECH, Vol. 19, N° 6 (07/2022)  

[article]  inCOATINGS TECH > Vol. 19, N° 6 (07/2022) . - p. 38-47 Titre : ASTM accelerated dirt pickup resistance method with correlation to natural outsdoor weathering Type de document : texte imprimé Auteurs : Keith Alderfer, Auteur ; James Maher, Auteur ; Partha Majumdar, Auteur ; Jeff Sweeney, Auteur Année de publication : 2022 Article en page(s) : p. 38-47 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Essais accélérés (technologie) Peinture -- Normalisation Résistance à la salissure Résistance aux conditions climatiques Revêtements en bâtiment:Peinture en bâtiment Index. décimale : 667.9 Revêtements et enduits Résumé : The Architectural Subcommittee of ASTM’s Paint and Related Coatings, Materials and Applications Committee (D01.42), in collaboration with industrial partners, investigated an accelerated laboratory method to assess the exterior dirt pickup resistance of architectural coatings. A concurrent exterior exposure study was conducted with seven commercial paints across seven locations with varied climates throughout the United States for 36 months. The accelerated laboratory method explored multiple variables including dry time of the coating and QUV exposure time. For the exterior study, to understand the impact of multiple variables and their interactions on final response, a robust statistical methodology was applied utilizing both a mixed model with fixed and random effects to account for repeated measure analysis and a standard least square linear regression. Finally, the results from the two methods, laboratory and exterior, were compared to understand the similarity of the overall trends. Note de contenu : - EXPERIMENTAL : Materials - TEST PROCEDURES : Accelerated lab DPUR method - Natural weathering of paints for assessment of DPUR - RESULTS AND DISCUSSION : Results of accelerated DPUR single lab study - Results and analysis of exterior weathering DPUR study - Data analysis/modeling - CORRELATION OF PROPOSED ACCELERATED METHOD WITH EXTERIOR EXPOSURE : Mixed model approach for RMA - Table 1 : Description of paints used in the study - Table 2 : Results of accelerated lab DPUR method by paint ID, sheen category, and quality category En ligne : https://drive.google.com/file/d/1o34aGmHLfPF0iufRg-pHqlLFbpKgxIbr/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38225 [article]

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Coatings Tech Vol. 19, N° 6 URL