Migration of reactable UVAs and HALS in automotive plastic coatings / Philip V. Yannef in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 1, N° 3 (07/2004)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 1, N° 3 (07/2004) . - p. 201-212 Titre : Migration of reactable UVAs and HALS in automotive plastic coatings Type de document : texte imprimé Auteurs : Philip V. Yannef, Auteur ; Mouhcine Kanouni, Auteur ; Nancy Cliff, Auteur ; Karlis Adamsons, Auteur Année de publication : 2004 Article en page(s) : p. 201-212 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Copolymère mélamine-formaldéhyde Durée de vie (Ingénierie) Essais accélérés (technologie) Haut extrait sec Organosilanes Prévision, Théorie de la Revêtement en plastique Silanes Stabilisant à la lumière de type amine encombrée Stabilisants à la lumière Surfaces -- Analyse Tags : Stabilisants  à  la  lumièreanalyse  de  surfacerésines  mélamine-formaldéhydeorganosilaneessais  accélérésprévision  durée  vieplumeautomobile  -  OEMmélamine  haute  teneur  en  solidessilaneles  plastiques Index. décimale : 667.9 Revêtements et enduits Résumé : Loss of light stabilizers from automotive finishes can significantly reduce the durability of coatings on plastic substrates. Minimizing movement by retaining the stabilizers in the targeted layer can greatly improve coating longevity. This article examines the migratory patterns of a series of traditional UVA and HALS additives in fully formulated 1K silane crosslinked coatings applied over both plastic and steel substrates, comparing their migratory patterns to that of reactable light stabilizers containing hydroxyl functionality. Analysis of the coating layers with the various UVAs and HALS revealed that functionalization of the light stabilizer with reactable hydroxy groups can prevent migration into the plastic; whereas nonreactable light stabilizers migrate into lower coating system layers and even into the plastic substrate. The greatest extent of migration does not occur during initial cure of the wet coating, but during exposure. Significant depletion of the nonreactable light stabilizers from the topcoat occurs as early as 1500 hours of Xenon boro/boro exposure. DOI : 10.1007/s11998-004-0013-3 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-004-0013-3.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3900 [article]

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Use of reactable light stabilizers to prevent migration and to improve durability of coatings On plastic substrates / Nancy Cliff in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 2, N° 5 (01/2005)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 2, N° 5 (01/2005) . - p. 371-387 Titre : Use of reactable light stabilizers to prevent migration and to improve durability of coatings On plastic substrates Type de document : texte imprimé Auteurs : Nancy Cliff, Auteur ; Karlis Adamsons, Auteur ; Phillip V. Yaneff, Auteur ; Cindy Peters, Auteur ; Mouhcine Kanouni, Auteur Année de publication : 2005 Article en page(s) : p. 371-387 Note générale : Bibliogr. Langues : Américain (ame) Tags : Etude  expérimentale  Durabilité  Dégradation  photochimique  Vieillissement  accéléré  Pipéridine  dérivé  Triazine  Absorbant  UV  Stabilisant  Additif  Relation  formulation  propriété  Peinturage  Procédé  revêtement  Matériau  revêtu  Elastomère  Mélange  polymère  Oléfine  Caoutchouc  thermoplastique Index. décimale : 667.9 Revêtements et enduits Résumé : One of the challenges of coating plastic substrates for exterior automotive applications involves the tendency for light stabilizers, which inhibit UV degradation of the coating, to migrate out of the topcoat and into the underlying plastic substrate. The consequent depletion of the stabilizer from the topcoat could account for significantly poorer durability for coatings applied on plastic than on a nonpermeable substrate such as steel. These studies investigate the migration of both nonreactable and reactable UV absorbers (UVAs) and hindered amine light stabilizers (HALS) in fully formulated 2K urethane coatings applied on thermoplastic olefin (TPO) and steel substrates. Extensive migration of the nonreactable stabilizers occurs during accelerated exposure of the cured coating, and this migration correlates with poorer performance on TPO. Functionalization of the stabilizer with a group which covalently reacts into the coating will prevent much of this migration, and the improved degree of retention of the reactable light stabilizers in the topcoat correlates with improved performance on TPO substrates. In addition, stabilizer variables, such as the type and extent of functionalization as well as their chemical structure, have an effect on both the migration and performance of the stabilizers. DOI : 10.1007/s11998-005-0005-y En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-005-0005-y.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3727 [article]

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