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Auteur Andrew J. Muehlberg
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Department of Coatings and Polymeric Materials, North Dakota State University, ND, Fargo, USA
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Linear glycidyl carbamate (GC) resins for highly flexible coatings / Umesh D. Harkal in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 10, N° 2 (03/2013)
[article]
Titre : Linear glycidyl carbamate (GC) resins for highly flexible coatings Type de document : texte imprimé Auteurs : Umesh D. Harkal, Auteur ; Andrew J. Muehlberg, Auteur ; Dean C. Webster, Auteur Année de publication : 2013 Article en page(s) : p. 141-151 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Carbamate de glycidyle
Epoxydes
Polyuréthanes
Revêtements:Peinture
Souplesse (mécanique)Index. décimale : 667.9 Revêtements et enduits Résumé : An approach to the design of highly flexible coatings based on glycidyl carbamate (GC) chemistry is presented. In past work, GC resins had been synthesized by reacting polyisocyanates such as hexamethylene diisocyanate biuret or hexamethylene diisocyanate isocyanurate resins with glycidol. When crosslinked with amines, due to their high functionality, these resins form very hard and tough coatings, but the coatings have limited flexibility. To obtain coatings with good flexibility, several GC resins were synthesized using linear and cycloaliphatic diisocyanates and a combination of diols and triol with glycidol. The combination of linear diisocyanates and diols introduces a more linear structure in the GC resin compositions. Crosslinked coatings were obtained using two amine crosslinkers, para-aminocyclohexyl methane (PACM) and a commercial polyamide, Ancamide-2353 (A-2353). The flexibility of the coatings was characterized using reverse impact test, GE impact test, and elongation at break in tensile test. The coatings were further characterized to determine their chemical resistance, hardness, thermal stability, and corrosion resistance. The diisocyanate composition and composition of diols and triol influenced the performance of the coatings. In order to understand the influence of the composition of the GC resins on their performance, coatings were characterized using differential scanning calorimetry and dynamic mechanical analysis. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of glycidyl carbamate functional resins - NCO titration - Characterization - Coating preparation - Coating performance - Differential scanning calorimetry (DSC) - Thermogravimetric analysis (TGA) - Dynamic mechanical analysis (DMA) - Tensile test - Salt spray test (ASTM B 117)
- RESULTS AND DISCUSSION : Synthesis of GC resins based on diisocyanates and diols - Initial screening of coating based on impact and solvent resistance - Further analysis of properties of the screened coatings - Dynamic mechanical analysis - Thermal stability - Salt spray testDOI : 10.1007/s11998-012-9415-9 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-012-9415-9.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18230
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 10, N° 2 (03/2013) . - p. 141-151[article]Réservation
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[article]
Titre : Novel water-dispersible glycidyl carbamate (GC) resins and waterborne amine-cured coatings Type de document : texte imprimé Auteurs : Umesh D. Harkal, Auteur ; Andrew J. Muehlberg, Auteur ; Peter A. Edwards, Auteur ; Dean C. Webster, Auteur Année de publication : 2011 Article en page(s) : p. 735-747 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Carbamate de glycidyle
Epoxydes
Hydrophilie
Monte-Carlo, Méthode de
Polyuréthanes
Revêtements en phase aqueuse:Peinture en phase aqueuseIndex. décimale : 667.9 Revêtements et enduits Résumé : Water-dispersible glycidyl carbamate (GC) functional resins were synthesized and crosslinked using a water-dispersible amine to form coatings. GC functional resins are synthesized by the reaction of an isocyanate functional compound with glycidol to yield a carbamate (urethane) linkage (–NHCO–) and reactive epoxy group. The combination of both functionalities in a single resin structure imparts excellent mechanical and chemical properties to the coatings. Previous studies on the development of GC coatings have focused on solvent-borne coating systems. In this study, GC resins were modified by incorporating nonionic hydrophilic groups to produce water-dispersible resins. To determine the influence of the content of hydrophilic groups on dispersion stability, aqueous dispersions were made from a series of hydrophilically modified GC resins and characterized for particle size and dispersion stability. The composition of a typical, dispersed GC resin particle was predicted using Monte Carlo simulations. Stable GC dispersions were used to prepare amine-cured coatings. The coatings were characterized for solvent resistance, water resistance, hardness, flexibility, adhesion, and surface morphology. It was observed that GC resins were able to be dispersed in water without using any surfactant and by minimal mixing force (hand mixing) and produced coating films with good properties when crosslinked with a compatible waterborne amine crosslinker. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of mPEG-modified GC resins - Characterization - Coating formulation preparation - Coating performance - Differential scanning colorimetry (DSC) - Thermogravimetric analysis (TGA) - Dynamic mechanical analysis (DMA) - Atomic force microscope (AFM) - Salt spray test
- RESULTS AND DISCUSSION : Synthesis of water-dispersible GC resins - Dispersion stability - Coating formulations - Water and solvent resistance - Water contact angle - Other coating properties - Further analysis of the coating properties - Thermal stability - Salt spray testDOI : 10.1007/s11998-011-9356-8 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-011-9356-8.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12600
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 8, N° 6 (11/2011) . - p. 735-747[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 13484 - Périodique Bibliothèque principale Documentaires Disponible