Dépouillements

Effect of formulation variables on coating properties and performance in the deep draw process / A. Polyakova 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. 69-75 Titre : Effect of formulation variables on coating properties and performance in the deep draw process Type de document : texte imprimé Auteurs : A. Polyakova, Auteur ; A. Hiltner, Auteur ; E. Baer, Auteur ; Theodore Provder, Auteur Année de publication : 2000 Article en page(s) : p. 69-75 Note générale : Bibliogr. Langues : Américain (ame) Tags : Matériau  revêtement  Utilisation  Conteneur  Métal  Emboutissage  Adhérence  Formulation  Performance Index. décimale : 667.9 Revêtements et enduits Résumé : This study demonstrated correspondences between certain coating properties and observed failure modes in the deep draw process. Mode I failure, coating delamination at the cup edge, correlated with residual compressive stresses in the drawn coating. Neither crosslinker concentration nor prepolymer molecular weight in the ranges studied significantly affected residual stresses. However, residual stresses were strongly affected by the amount of wax in the coating formulation to the extent that coatings with less than 1.5% wax exhibited mode I failure, whereas coatings with 1.5% or more did not fail. Some of the coatings that exhibited mode I failure also exhibited mode II failure. Loss of adhesion on the cup wall, mode II failure, correlated with adhesive strength of the coating to the metal substrate, which in the present study was most strongly affected by crosslinker concentration. Coatings with 15 and 20% crosslinker exhibited extended areas of mode II failure, whereas coatings with 10% crosslinker showed no mode II failure. Increasing the molecular weight of the prepolymer improved adhesion somewhat, but not enough to affect the failure mode in the coatings tested, and wax had no measurable effect on the adhesion. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5825 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
001206	-	Périodique	Bibliothèque principale	Documentaires	Disponible

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]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
001206	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Morphology of hybrid coatings based on polyester, melamine resin, and silica and the relation with hardness and scratch resistance / S. Frings 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. 83-89 Titre : Morphology of hybrid coatings based on polyester, melamine resin, and silica and the relation with hardness and scratch resistance Type de document : texte imprimé Auteurs : S. Frings, Auteur ; Cornelus F. Van Nostrum, Auteur ; R. van der Linde, Auteur ; H. A. Meinema, Auteur ; Corné Rentrop, Auteur Année de publication : 2000 Article en page(s) : p. 83-89 Note générale : Bibliogr. Langues : Américain (ame) Tags : Matériau  revêtement  composite  Composite  hybride  Ester  polymère  Mélamine  résine  Silice  Propriété  mécanique  Feuil  Dureté  Résistance  rayure  Morphologie  Etude  expérimentale Index. décimale : 667.9 Revêtements et enduits Résumé : The morphology of hybrid coatings based on polyester, melamine resin, and various amounts of silica has been investigated, and the hardness and scratch resistance were determined. By increasing silica content, an increase of silica particles in size and number was observed. Small silica particles were preferentially present at the surface. The influence of the silica content on the König hardness, indentation hardness, and elastic modulus was minor. The improved scratch resistance determined for a hybrid coating with 11.4 wt% silica, compared to a similar organic coating without silica, was attributed to small silica particles preferentially present at the surface. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5827 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
001206	-	Périodique	Bibliothèque principale	Documentaires	Disponible