Dimethyl secondary amine chain extenders : a conceptual approach to in situ generation of advanced epoxy resins for rapid-cure, low-VOC coatings / Frederick H. Walker in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 6, N° 3 (09/2009)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 6, N° 3 (09/2009) . - p. 283-313 Titre : Dimethyl secondary amine chain extenders : a conceptual approach to in situ generation of advanced epoxy resins for rapid-cure, low-VOC coatings Type de document : texte imprimé Auteurs : Frederick H. Walker, Auteur ; Rob Rasing, Auteur ; Gamini A. Vedage, Auteur ; Michael Cook, Auteur Année de publication : 2009 Article en page(s) : p. 283-313 Note générale : Bibliogr. Langues : Américain (ame) Tags : Poly(N-methylazetidine)  Dimethyl-meta-xylylenediamine  Pseudo-first-order  kinetic  Amine  reactivity  epoxy  curing  agent  Epoxy  resin  coating  Flexibility  Crosslink  density  Miller-Macosko  calculation  Chain  extender  VOC  Low  temperature  cure  Environmental  movement  Electrochemical  impedance  Aine  reaction  mechanism  Mannich  base Index. décimale : 667.9 Revêtements et enduits Résumé : Advanced epoxy resin oligomers have traditionally been utilized for coatings that combine fast dry-to-touch speed and good flexibility--properties demanded in many markets such as marine and industrial maintenance coatings. Unfortunately, advanced epoxy resins require formulation with large quantities of solvent that make attainment of modern VOC regulations difficult or impossible. Coatings formulated from low molecular weight liquid epoxy resin, on the other hand, can easier meet VOC challenges, but dry slowly and tend to be brittle. This presentation explores the concept of using fast reacting, di-functional amine chain extenders to generate epoxy oligomers in situ as a means to meet these opposing property demands. Methylamine-terminated poly-(N-methylazetidine) (pNMAz, 1) is prepared in a two-step process involving the Michael addition of methylamine to acrylonitrile, followed by hydrogenation in a methylamine-containing atmosphere to yield an oligomer stream with an [M.sub.n] of about 250. Competitive pseudo-first-order kinetic measurements conducted in isopropyl alcohol indicate methyl-substituted disecondary diamines reacted approximately 3 to 3.6 times faster with phenyl glycidyl ether (PGE) than the primary amine meta-xylylenediamine (MXDA). These chain extenders can be formulated with traditional multi-functional amine crosslinkers to yield coatings with lower VOC, faster dry speed, and better flexibility compared to corresponding coatings formulated without the chain extender. DOI : 10.1007/s11998-009-9178-0 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-009-9178-0.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=6111 [article]

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More scope for waterbornes / Stefen Monaghan in EUROPEAN COATINGS JOURNAL (ECJ), N° 11/2005 (11/2005)  

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 11/2005 (11/2005) . - p. 20-25 Titre : More scope for waterbornes : Novel epoxy curing agents meet demands of decorative and construction markets Type de document : texte imprimé Auteurs : Stefen Monaghan, Auteur ; Matthias Lohe, Auteur ; Michael Cook, Auteur Année de publication : 2005 Article en page(s) : p. 20-25 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Résumé : Epoxy systems - Two novel curing agents allow waterborne epoxy coatings to be used in areas traditionally open only to solventborne and other more hazardous materials. A dispersion-based polymeric amine curing agent offers low viscosity, good colour retention and long pot life, while a Mannich base curing agent provides fast cure and excellent adhesion under difficult conditions in the civil engineering market, in particular opening up the possibility to coat freshly laid green concrete. En ligne : https://drive.google.com/file/d/15PfcgvsbE5EUMxHuoMpJ1AozrSqEa-ZM/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8783 [article]

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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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