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Partager le résultat de cette rechercheCure of secondary carbamate groups by melamine-formaldehyde resins / H. P. Higginbottom in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 71, N° 894 (07/1999)
Titre : Cure of secondary carbamate groups by melamine-formaldehyde resins Type de document : texte imprimé Auteurs : H. P. Higginbottom, Auteur ; G. R. Bowers, Auteur ; Patricia E. Ferrell, Auteur ; Loren W. Hill, Auteur Année de publication : 1999 Article en page(s) : p. 49-69 Note générale : Bibliogr. Langues : Américain (ame) Tags : 'Matériau revêtement' Peinture Thermodurcissable Durcissement 'Groupe fonctionnel' Carbamate Réticulation Réticulant 'Mélamine résine' Formaldéhyde Aminoplaste 'Mécanisme réaction' Feuil 'Propriété dynamomécanique' 'Etude expérimentale' Index. décimale : 667.9 Revêtements et enduits Résumé : Melamine-formaldehyde (MF) resins have been used as crosslinkers for hydroxyl-functional co-reactants in thermoset coatings for about 60 years. Crosslink densities of films prepared from oligomeric urethane polyols suggested that the methoxymethyl groups of MF resins could react with urethane groups (i.e., secondary carbamate groups) as well as reacting with hydroxyl groups. Co-reactants that contain secondary carbamate groups and no hydroxyl groups have been prepared with several types of backbone structures. Cure of such co-reactants by MF resins has been studied using a gradient oven with determination of impact resistance, solvent resistance, and hardness. Several formulations from these cure profile sets have been selected for crosslink density determinations by dynamic mechanical analysis (DMA). Crosslink densities of cured films are consistent with complete conversion of secondary carbamate groups at temperatures only slightly higher than those used for cure of hydroxyl groups. The -OH groups on certain acrylic polyols were converted to secondary carbamate groups. The original acrylic and the converted acrylic were both cured with MF resins. Acid resistance was much better for films prepared from the acrylic that contained secondary carbamate groups. Note de contenu : - RESULTS AND DISCUSSION : Synthesis and characterization of secondary carbamate co-reactants - Cure response of model carbamates in a gradient oven test - Dynamic mechanical analysis of films from selected co-reactants - Secondary carbamate groups on the same backbone - Effect of melamine crosslinker structure on cure of secondary carbamates - MF cure of aqueous polyurethane dispersions Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17912
in JOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 71, N° 894 (07/1999) . - p. 49-69[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 003562 - Périodique Bibliothèque principale Documentaires Disponible
Titre : Low VOC carbamate functional coatings compositions for automotive topcoats Type de document : texte imprimé Auteurs : Marvin L. Green, Auteur Année de publication : 2001 Article en page(s) : p. 55-62 Note générale : Bibliogr. Langues : Américain (ame) Tags : Industrie automobile Matériau revêtement Peinture Vernis Liant Formulation Polymère fonctionnel Carbamate organique Composé volatil Feuil Propriété physique mécanique haute teneur solide Index. décimale : 667.9 Revêtements et enduits Résumé : Polymers and oligomers having carbamate functional groups have been used in a variety of curable coating compositions. Carbamate functional polymers offer many advantages for automotive topcoats, such as outstanding resistance to environmental etching, scratching and marring, humidity, and UV exposure. Hydrophobic carbamate oligomers suitable for crosslinking with standard amino resins were synthesized and formulated into stable one-pack automotive clearcoats with low volatile organic compound (VOC) and excellent physical properties. Because of their unusually steep thermal viscosity curves, these oligomers are particularly adaptable to hot spray techniques that enable coatings in the 85-90% weight solids range to be applied with conventional electrostatic mini-bells. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5739
in JOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 73, N° 918 (07/2001) . - p. 55-62[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 001226 - Périodique Bibliothèque principale Documentaires Disponible 
Titre : Novel polyurethane coating technology through glycidyl carbamate chemistry Type de document : texte imprimé Auteurs : Peter A. Edwards, Auteur ; Dean C. Webster, Auteur ; Grant Striemer, Auteur Année de publication : 2005 Article en page(s) : p. 517-527 Note générale : Bibliogr. Langues : Américain (ame) Tags : Glycidol polymère Propriété chimique Etude expérimentale thermique Relation mise en oeuvre propriété mécanique Mécanisme réaction Cinétique Résistance choc Dureté solvant Triamine Diamine Durcissement(matière plastique) Epoxyde résine Réactivité Matériau revêtement Carbamate organique Index. décimale : 667.9 Revêtements et enduits Résumé : Glycidyl carbamate chemistry combines the excellent properties of polyurethanes with the crosslinking chemistry of epoxy resins. Glycidyl carbamate functional oligomers were synthesized by the reaction of poly functional isocyanate oligomers and glycidol. The oligomers were formulated into coatings with several amine functional crosslinkers at varying stoichiometric ratios and cured at different temperatures. Properties such as solvent resistance, hardness, and impact resistance were dependent on the composition and cure conditions. Most coatings had an excellent combination of properties. Studies were carried out to determine the kinetics of the curing reaction of the glycidyl carbamate functional oligomers with multifunctional and model amines. Detailed kinetic analysis of the curing reactions was also undertaken. The results indicated that the glycidyl carbamate functional group is more reactive than a glycidyl ether group. DOI : 10.1007/s11998-005-0011-0 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-005-0011-0.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3799
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 2, N° 7 (07/2005) . - p. 517-527[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 002327 - Périodique Bibliothèque principale Documentaires Disponible
Titre : The influence of structural modification and composition of glycidyl carbamate resins on their viscosity and coating performance Type de document : texte imprimé Auteurs : Umesh D. Harkal, Auteur ; Aaron J. Muehlberg, Auteur ; Jung Li, Auteur ; James T. Garrett, Auteur ; Dean C. Webster, Auteur Année de publication : 2010 Article en page(s) : p. 531-546 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Revêtements:Peinture Tags : 'Résine de carbamate glycidyl' Uréthane Epoxy Revêtement 'Rapports structure-propriété' Index. décimale : 667.9 Revêtements et enduits Résumé : The synthesis, characterization, and coatings performance of a series of glycidyl carbamate (GC) resins synthesized from a hexamethylene diisocyanate biuret resin, glycidol, and alcohols were explored. The partial replacement of glycidol with alcohols was explored as a way to reduce the viscosity of multifunctional GC resins. Six modified GC resins were obtained by replacing one-third of the glycidol with alcohols and ether alcohols. The modified GC resins were characterized using FTIR and 13C NMR. The alcohol-modified GC resins had significantly lower viscosity than that of the control GC resin. The effect of amount of alcohol modifier on resin viscosity was also studied by making a series of resins with different levels of modifier. Both amine-cured and self-crosslinked coatings were prepared from the resins. Coating properties such as hardness, impact strength, methyl ethyl ketone double rubs, flexibility, and adhesion were studied. Differential scanning calorimetry and thermogravimetric analysis were also used to study the thermal properties of the coatings. The resin structures and their coating performance showed an excellent correlation. The coating performance was found to be governed by the type of modifier, structural compositions of the modifier in the resins, type of amine crosslinkers, and techniques of crosslinking used. DOI : 10.1007/s11998-010-9262-5 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-010-9262-5.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9909
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 7, N° 5 (09/2010) . - p. 531-546[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 012448 - Périodique Bibliothèque principale Documentaires Disponible
