Studies of the aging effect on the level of isocyanate residues in polyester-based can coating systems / C. Jiang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 6, N° 4 (12/2009)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 6, N° 4 (12/2009) Titre : Studies of the aging effect on the level of isocyanate residues in polyester-based can coating systems Type de document : texte imprimé Auteurs : C. Jiang, Auteur ; M. Driffield, Auteur ; E. L. Bradley, Auteur ; Peter K. T. Oldring, Auteur ; P. Cooke, Auteur ; L. Castle, Auteur ; James Thomas Guthrie, Auteur Année de publication : 2009 Note générale : Bibliogr. Langues : Américain (ame) Tags : Polyester  Polyurethane  MEKO-blocked  isocyanate  Migration  Can  coatings  Aging Index. décimale : 667.9 Revêtements et enduits Résumé : A methyl ethyl ketone oxime-blocked isocyanate was used as a crosslinking agent in the curing of polyester–polyurethane (PEPU) can coatings. The completeness of cure was assessed from the amount of residual (un-reacted) isophorone diisocyanate (IPDI) trimer that was presented in the coating after curing. This amount of residual trimer depended strongly on the temperature at which the curing was undertaken and time given for curing. The degree of cure was also assessed, correlating with the reduced IPDI trimer migration potential. The amount of residual IPDI trimer that was extractable from a typical PEPU coating rose markedly (15- to 20-fold) if the wet coating was aged up to 6 months before use. The presence of a TiO2 pigment increased the aging effect. An aluminum flake pigment had an even greater effect. The TiO2 pigment increased aging by different degrees according to the type of surface modification that had been applied to the pigment. The grade having the greatest alumina content, as a result of surface modification, gave the greatest aging. The undesirable effects of aging were counteracted by the addition of more catalyst to the aged coating just before the coating was used to coat panels. Deactivation of the acidic polymerization catalyst system (based on organotin compounds) is thought to be the cause of this aging. These findings have allowed improvements to be made to the specifications of the pigments and the catalysts used, with respect to the consistent industrial production of low migration coatings. DOI : 10.1007/s11998-009-9168-2 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-009-9168-2.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=7688 [article]

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The behavior of MEKO-blocked isocyanate compounds in aluminum flake pigmented, polyester–polyurethane can coating / C. Jiang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 7, N° 1 (01/2010)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 7, N° 1 (01/2010) . - p. 57-65 Titre : The behavior of MEKO-blocked isocyanate compounds in aluminum flake pigmented, polyester–polyurethane can coating Type de document : texte imprimé Auteurs : C. Jiang, Auteur ; M. Driffield, Auteur ; E. L. Bradley, Auteur ; L. Castle, Auteur ; Peter K. T. Oldring, Auteur ; James Thomas Guthrie, Auteur Année de publication : 2010 Article en page(s) : p. 57-65 Note générale : Bibliogr. Langues : Américain (ame) Tags : Polyester–polyurethane  MEKO-blocked  isocyanate  Migration Index. décimale : 667.9 Revêtements et enduits Résumé : Information is given concerning the curing characteristics of polyester–polyurethane (PEPU)-based food can coatings and the analysis of the free isocyanate by-products. The behavior of a methyl ethyl ketoxime (MEKO)-blocked isocyanate on heating was studied using thermal analytical techniques. Following this, the curing behavior of a PEPU-based can coating (PEPU01 that contained an aluminum flake pigment) and the MEKO-blocked isocyanate was investigated. A study of the unblocking of the MEKO-blocked isocyanate in the PEPU01 can coatings was undertaken with respect to the migration potential of any residual-free isocyanate compounds that could migrate from the cured PEPU can coatings to the surrounding medium (e.g., foodstuffs). DOI : 10.1007/s11998-009-9174-4 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-009-9174-4.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8347 [article]

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