Polyamine curing agents meeting the industry need for enhanced productivity / Michael Cook in COATINGS TECH, Vol. 16, N° 3 (03/2019)  

[article]  inCOATINGS TECH > Vol. 16, N° 3 (03/2019) . - p. 42-54 Titre : Polyamine curing agents meeting the industry need for enhanced productivity Type de document : texte imprimé Auteurs : Michael Cook, Auteur ; Sudhir Ananthachar, Auteur ; Zheng Shiying, Auteur Année de publication : 2019 Article en page(s) : p. 42-54 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésion Analyse thermique Anticorrosifs Anticorrosion Composés polycycliques Décollement cathodique (revêtement) Epoxydes Essais de brouillard salin Essais de résilience Formulation (Génie chimique) Humide sur humide (revêtements) Marines (peinture) Polyamines Polycarbamide Primaire (revêtement) Réticulants Revêtements -- Séchage sous rayonnement infrarouge proche Revêtements antisalissures:Peinture antisalissures Revêtements bi-composant Transition vitreuse Vernis Index. décimale : 667.9 Revêtements et enduits Résumé : In the challenging world of industrial, protective, and marine coatings, two-component (2K) epoxy systems are established as the benchmark technologies due to the combined offerings of excellent corrosion protection and compliance with regional volatile organic compound standards. Today, productivity has emerged as a major driver, and innovation focuses on developing epoxy coatings that have greater application versatility while providing enhanced performance properties, such as dry speed, rapid recoat, and through-cure. For marine and protective coatings, the need is for faster cure and blush-resistant coatings when applied under adverse, low temperatures conditions. In the OEM sector, the wet-on-wet application process means there is a requirement for epoxy systems to provide rapid overcoatability with polyurethane and/or polycarbamide topcoats within minutes after initial application of the primer. In this sector, the drivers are to increase overall productivity with faster application of multiple layers coupled with lower bake temperatures which can provide energy savings. This article will focus on the performance attributes of a novel polycyclic-aliphatic amine and its use in the development of new epoxy curing agents designed to provide benefit in the above markets. The supporting data includes the functional properties thermal analysis, glass transition (Tg ), and infrared (IR)-cure profile, confirming the rapid through-cure and crosslinking capabilities in epoxy systems. In addition, a review of model coating formulations and their key performance attributes, including the rapid recoat times, improved intercoat adhesion, and excellent corrosion protection properties will be discussed. Note de contenu : - Key features and benefits of the poly[HCA]amine building block - Fast property development of poly[HCA]amine - Fundamental study of fast cure mechanism of poly[HCA]amine - New polycyclic polyamide curing agents - Novel polyamide curing agents for wet-on-wet applications - Rapid recoat study using polycarbamides - Anti-corrosive primer formulation - Accelerated corrosion resistance - Cathodic disbondment - Table 1 : Properties of poly[HCA]amine - Table 2 : Summary of clear coating properties - Table 3 : Typical handling properties of rapid dry polycyclic amine polyamides - Table 4 : Tg and Mc from DMA analysis of polyamide systems - Table 5 : Base handling and performance properties of polyamide systems - Table 6 : Time to cure properties of traditional and rapid cure polyamides - Table 7 : Wet and dry adhesion properties of epoxy primers with epoxy topcoats - Table 8 : Wet/dry adhesion properties of epoxy primers with poycarbamide topcoats En ligne : https://drive.google.com/file/d/1QhY8BfKMwkQKGlF9GDpNy-kJlzV0LDr_/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32046 [article]

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Rapid Protection / Sudhir Ananthachar in EUROPEAN COATINGS JOURNAL (ECJ), N° 2 (02/2017)  

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 2 (02/2017) . - p. 18-24 Titre : Rapid Protection : Fast-curing polycarbamide system creates low VOC direct-to-metal (DTM) finishes Type de document : texte imprimé Auteurs : Sudhir Ananthachar, Auteur Année de publication : 2017 Article en page(s) : p. 18-24 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Anticorrosifs Anticorrosion Application directe sur le métal Formulation (Génie chimique) Liants Métaux -- Revêtements protecteurs Polyaspartiques Polycarbamide Polyisocyanates Résistance chimique Réticulants Revêtement -- Séchage Vernis Index. décimale : 667.9 Revêtements et enduits Résumé : A new polycarbamide-isocyanate binder system was compared with 2K PU coatings in both DTM anticorrosive and topcoat formulations. Performance was similar, but with faster drying and considerably lower VOCs. Advantages were also found over polyaspartics. Note de contenu : - Limitations of 2K PU coatings in DTM applications - Basic properties of the polycarbamide curing agents - Faster drying and lower VOCs achieved - Corrosion and chemical resistance comparable to 2K PU - Topcoat compared with acrylic urethane system - Some advantages also shown over polyaspartics - A broad spectrum of property improvements - TABLES : 1. Gel times and typical physical properties of PCA1 and PCB1 - 2. Typical physical properties of aliphatic polyisocyanate resin - 3. DTM and pigmented topcoat formulations - 4. Pigmented acrylic polyol topcoat formulation - 5. DTM coatings : performance properties of PCA1 - 6. DTM corrosion performance on cold-rolled steel - 7. Chemical resistance spot tests on DTM coatings - 8. Performance properties of polycarbamide and acrylic urethane topcoats - FIGURES : 1. Key moieties within the polymeric crosslinked systems polycarbamide and polyurethane - 2. Pot life of polycarbamides compared - 2. Polycarbamide DTM coatings, 500h corrosion resistance. Left, iron phosphated steel ; centre, zinc phosphated steel ; right sand blasted steel - 4. Polycarbamide DTM and 2K polyurethane DTM, 500h corrosion resistance over cold rolled steel and polycarbamide and 2K:PU En ligne : https://drive.google.com/file/d/11tjaIZS9mp7t7TJ57vnlNS2HaSyH_PBT/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27819 [article]

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