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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The effect of slip agents on the characteristics and properties of epoxy-phenolic can coatings / Chao Jiang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 6, N° 1 (03/2009)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 6, N° 1 (03/2009) . - p. 99-106 Titre : The effect of slip agents on the characteristics and properties of epoxy-phenolic can coatings Type de document : texte imprimé Auteurs : Chao Jiang, Auteur ; Peter K. T. Oldring, Auteur ; Laurence Castle, Auteur ; Paul Cooke, Auteur ; James Thomas Guthrie, Auteur Année de publication : 2009 Article en page(s) : p. 99-106 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Abrasion Epoxydes Mouillage (chimie des surfaces) Phénoplastes Revêtements -- Additifs Index. décimale : 667.9 Revêtements et enduits Résumé : The migration issues associated with the transfer of chemicals from epoxy-based can coatings into foodstuffs have been studied in recent years. Slip agents are usually used in can coatings for ease of manufacture and to provide required physical resistance properties. Slip agents in epoxy-based can coatings are suspected of not only performing as lubricants but also having effects on the other properties of coatings, including their migration resistance. This article contains information relating to the evaluation of the influence of selected slip agents on the characteristics and properties of specific epoxy-phenolic can coatings. These characteristics and properties include those thermal properties of the coatings that relate to curing characteristics, the surface appearance of cured coating films, the wetting properties that may be associated with migration issues, and the abrasion properties of the cured epoxy-phenolic systems. It was found that three selected slip agents each affected the properties of the specific epoxy-phenolic can coating differently. One of three selected slip agents in particular reduced the interaction (“wettability”) of the specific coatings by test fluids and so may help to reduce chemical migration. DOI : 10.1007/s11998-008-9114-8 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-008-9114-8.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4878 [article]

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The effect of TiO2, pigmentation on the hydrolysis of amino resin crosslinked epoxy can coatings / Saminu Musa Magami in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 11, N° 6 (11/2014)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 11, N° 6 (11/2014) . - p. 1013-1022 Titre : The effect of TiO2, pigmentation on the hydrolysis of amino resin crosslinked epoxy can coatings Type de document : texte imprimé Auteurs : Saminu Musa Magami, Auteur ; Peter K. T. Oldring, Auteur ; Laurence Castle, Auteur ; James Thomas Guthrie, Auteur Année de publication : 2014 Article en page(s) : p. 1013-1022 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anhydrides Can coating Dioxyde de titane Epoxydes Hydrolyse Mélamine La mélamine, de nom chimique 1,3,5-triazine-2,4,6-triamine, est parfois dénommée cyanuramide ou cyanurotriamine. Sa formule brute est C3H6N6. Les "résines mélamine-formaldéhyde" ou "mélamine-formol" (sigle MF) sont appelées "mélamine" dans le langage courant. Elles font partie de la famille des aminoplastes qui regroupe des résines thermodurcissables aminées, issues d'un comonomère tel l'urée ou la mélamine, parfois le thiocarbamide, le cyanamide hydrogène ou le dicyandiamide ; le second comonomère étant le formaldéhyde. Réticulants Index. décimale : 667.9 Revêtements et enduits Résumé : Pigmented (TiO2), amino resin crosslinked coatings, designed for applications in can coatings’ internal lacquers, were formulated, characterized, applied, and cured. Three grades of a pigmentary form of TiO2 were characterized in terms of their particle size, their particle morphology, their zeta potential, and their moisture retention behavior. Epoxy coatings that were crosslinked using one of several, different amino crosslinkers were prepared. The effect of the presence of the TiO2 pigments on the hydrolysis of the cured coatings was monitored via the controlled retorting of the coatings. The different grades of TiO2 pigment were selected, to establish whether or not they could be used interchangeably with respect to hydrolysis and to melamine release. Also, the effects of the aging of the fluid coatings on the amount of melamine released from the coatings (after curing and retorting) were monitored. Storage under laboratory conditions for 2, 20, and 40 weeks was used for this purpose. The TiO2 pigment contributed significantly to the hydrolysis behavior of the epoxy coatings in that their presence substantially reduced the amount of melamine released and the extent of crosslinker hydrolysis. Typical results show that excluding the TiO2 pigment particles from the formulation results in there being 50% more hydrolysis of the crosslinker to melamine. With respect to the melamine release and crosslinker hydrolysis, the different grades of the pigment gave similar results. Note de contenu : - MATERIALS : Analysis of TiO2 - Preparation of the "model" epoxy-anhydride coatings - Coating application and curing - Surface microscopy of coatings and contact angle studies : epoxy-anhydride coatings - Retort of coatings/hydrolysis tests : epoxy-anhydride coatings - Determination of the melamine released by the epoxy-anhydride coatings - RESULTS AND DISCUSSION : Behavior of the TiO2 pigment species - Effect of pigmentary TiO2 on the hydrolysis of cured epoxy-anhydride coatings to melamine DOI : 10.1007/s11998-014-9610-y En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-014-9610-y.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22357 [article]

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