Acid etch of automotive clearcoats. II. Comparison of degradation chemistry in laboratory and field testing / P. J. Schmitz in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 72, N° 902 (03/2000)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 72, N° 902 (03/2000) . - p. 53-61 Titre : Acid etch of automotive clearcoats. II. Comparison of degradation chemistry in laboratory and field testing Type de document : texte imprimé Auteurs : P. J. Schmitz, Auteur ; Joseph W. Holubka, Auteur ; Li - Feng Xu, Auteur Année de publication : 2000 Article en page(s) : p. 53-61 Note générale : Bibliogr. Langues : Américain (ame) Tags : Matériau  revêtement  Vernis  Automobile  Dégradation  chimique  Exposition  intempérie  Retombée  atmosphérique  Pluie  acide  Essai  laboratoire  en  champ  Etude  comparative  expérimentale  Spectrométrie  photoélectron  Rayon  X Index. décimale : 667.9 Revêtements et enduits Résumé : A laboratory test procedure was developed to quantitatively evaluate the acid etch resistance of automotive clearcoats, Here we attempt to verify that the conditions used in the laboratory test reproduce the field degradation chemistry to assure that the test is evaluating realistic performance characteristics. In this study we applied X-ray photoelectron spectroscopy (XPS) as a tool to determine if degradation products are observable which can be used to verify the consistency of the field and laboratory degradation processes for acrylic melamine-based clearcoats. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5822 [article]

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Acid etch resistance of automotive clearcoats. I : Laboratory test method development / Joseph W. Holubka in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 72, N° 901 (02/2000)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 72, N° 901 (02/2000) . - p. 77-82 Titre : Acid etch resistance of automotive clearcoats. I : Laboratory test method development Type de document : texte imprimé Auteurs : Joseph W. Holubka, Auteur ; Li - Feng Xu, Auteur ; P. J. Schmitz, Auteur Année de publication : 2000 Article en page(s) : p. 77-82 Note générale : Bibliogr. Langues : Américain (ame) Tags : Matériau  revêtement  Vernis  Industrie  automobile  Propriété  chimique  Feuil  Résistance  acide  Essai  laboratoire  Gravimétrie Index. décimale : 667.9 Revêtements et enduits Résumé : This paper reports on the development of a laboratory test procedure for the evaluation of the environmental etch resistance of clearcoats. The test evaluates the bulk acid hydrolysis resistance of clearcoats by gravimetrically following material weight loss as a function of exposure time to a sulfuric acid solution, under conditions that simulate outdoor exposure. The bulk hydrolysis resistance of five production clearcoat technologies including acrylic melamine, acrylic melamine-silane, carbamate, acrylic urethane, and epoxy acid were evaluated. Results from the weight loss measurements were consistent with those anticipated based on the coating systems bulk chemistry and inherent hydrolysis resistance, for clearcoat systems processed under nominal processing conditions. The relative rankings from the laboratory test were found to correlate with field etch ratings. The test method is inexpensive, quantitative, and generates repeatable results that are not subject to environmental variations associated with current field etch testing. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5826 [article]

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Bake oven induced variation of surface chemistry on electrocoat paint / Larry P. Haack in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 72, N° 903 (04/2000)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 72, N° 903 (04/2000) . - p. 63-70 Titre : Bake oven induced variation of surface chemistry on electrocoat paint : Effect on primer-electrocoat intercoat adhesion Type de document : texte imprimé Auteurs : Larry P. Haack, Auteur ; Joseph W. Holubka, Auteur Année de publication : 2000 Article en page(s) : p. 63-70 Note générale : Bibliogr. Langues : Américain (ame) Tags : Matériau  revêtement  Peinture  Multicouche  Durcissement  Cuisson  au  four  Propriété  surface  Adhérence  Interface  Dépôt  électrophorèse  Etude  expérimentale Index. décimale : 667.9 Revêtements et enduits Résumé : The interplay of bake oven processing environment and surface/interfacial chemistry, and their effect on intercoat adhesion has been investigated for a model primer/electrocoat paint system. X-ray photoelectron spectroscopy (XPS) surface analysis established that a prominent ether component in the C is core level spectrum correlated with a polyether-based crater-control additive in the electrocoat that surface-segregates during cure. Laboratory-simulated bake oven experiments confirmed that better adhesion characteristics were realized by removal of this electrocoat overlayer through reaction with nitrogen oxides and high levels of moisture present in the cure environment of production direct-fired ovens. Details of the effect of bake oven atmosphere on cure chemistry for direct-fired versus indirect-fired ovens are presented. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5817 [article]

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Influence of coating formulation variables and processing on the adhesion of melamine - crosslinked polyester primer to urethane - crosslinked epoxy electrocoat / Larry P. Haack in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 72, N° 905 (06/2000)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 72, N° 905 (06/2000) . - p. 61-65 Titre : Influence of coating formulation variables and processing on the adhesion of melamine - crosslinked polyester primer to urethane - crosslinked epoxy electrocoat Type de document : texte imprimé Auteurs : Larry P. Haack, Auteur ; Joseph W. Holubka, Auteur Année de publication : 2000 Article en page(s) : p. 61-65 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 667.9 Revêtements et enduits Résumé : The role of spray-primer formulation chemistry towards robustness of adhesion to an epoxy-based electrocoat was examined for a range of coatings representative of those used in automotive OEM applications. For coatings exhibiting degraded adhesion performance, high-resolution X-ray photoelectron spectroscopy (XPS) identified the presence of a surface-active polyether-based anti-cratering agent (ACA) formulated into the epoxy-based electrocoat at the primer/electrocoat interface. The adhesion performance of the better-performing systems was found to be related to the spray-primer’s ability to accommodate the ACA by either absorbing or displacing it from the electrocoat surface, thus diluting it to concentrations no longer adversely affecting adhesion. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5802 [article]

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Mechanism for environmental etch of acrylic melamine - based automotive clearcoats : identification of degredation / P. J. Schmitz in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 72, N° 904 (05/2000)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 72, N° 904 (05/2000) . - p. 39-45 Titre : Mechanism for environmental etch of acrylic melamine - based automotive clearcoats : identification of degredation Type de document : texte imprimé Auteurs : P. J. Schmitz, Auteur ; Joseph W. Holubka, Auteur ; Li - Feng Xu, Auteur Année de publication : 2000 Article en page(s) : p. 39-45 Note générale : Bibliogr. Langues : Américain (ame) Tags : Industrie  automobile  Matériau  revêtement  Vernis  Mélamine  résine  Acrylique  dérivé  polymère  Feuil  Dégradation  chimique  Hydrolyse  Pluie  acide  Mécanisme  réaction  Produit  Etude  expérimentale  Peinture Index. décimale : 667.9 Revêtements et enduits Résumé : This paper focuses on defining the reaction mechanism involved in the environmental etch of acrylic melaminic-based automative clearcoats via an identification of reaction products. This has been accomplished through a comparative study of products formed on acid treatment of neat crosslinkers, and those formed following laboratory acid treatment and field exposure of acrylic melamine clearcoat systems. Bulk elemental, X-ray photoelectron spectroscopy (XPS), and infrared (IR) analyses of sulfuric acid-treated melamine crossllinkers show that acid hydrolysis results primarily in the formation of melamine sulfate. Melamine sulfate formation was also observed following laboratory and field exposure of acrylic melamine clearcoat systems. These results confirm that the primary mode of melamine crosslink decomposition is through hydrolysis of acetal linkages and subsequent formation of melamine sulfate. However, data show that hydrolysis of pendent amino groups on the triazine ring also occurs. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5805 [article]

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