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On the combined use of UVA, HALS, photooxidation, and fracture energy measurements to anticipate the long-term weathering performance of clearcoat/basecoat automotive paint systems / J. L. Gerlock in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 73, N° 918 (07/2001)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 73, N° 918 (07/2001) . - p. 45-54 Titre : On the combined use of UVA, HALS, photooxidation, and fracture energy measurements to anticipate the long-term weathering performance of clearcoat/basecoat automotive paint systems Type de document : texte imprimé Auteurs : J. L. Gerlock, Auteur ; Mark E. Nichols, Auteur ; A. V. Kucherov, Auteur Année de publication : 2001 Article en page(s) : p. 45-54 Note générale : Bibliogr. Langues : Américain (ame) Tags : Industrie  automobile  Matériau  revêtement  Peinture  Vernis  Résistance  intempérie  Long  terme  Prévision  Spectrométrie  UV  Absorption  RPE  IR  Transformation  Fourier Index. décimale : 667.9 Revêtements et enduits Résumé : Transmission UV spectroscopy measurements of clearcoat ultraviolet light absorber (UVA) disposition, electron spin resonance (ESR) spectroscopy measurements of clearcoat and basecoat Active hindered amine light stabilizer (HALS) disposition, and transmission Fourier transform infrared (FTIR) measurements of photooxidation have been carried out on 5 µm thick slices of clearcoat/basecoat/primer/e-coat paint systems on steel panels as a function of outdoor exposure. These analysis results are combined with clearcoat fracture energy measurements to assess the possibility that a clearcoat/basecoat paint system will resist catastrophic cracking/peeling failure at long times. Taken together, all results indicate that these non traditional paint weathering performance metrics should be added to the existing repertoire of paint weathering performance metrics to ensure that inferior clearcoat/basecoat automotive paint systems are not introduced into service. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5738 [article]

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Low VOC carbamate functional coatings compositions for automotive topcoats / Marvin L. Green in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 73, N° 918 (07/2001)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 73, N° 918 (07/2001) . - p. 55-62 Titre : Low VOC carbamate functional coatings compositions for automotive topcoats Type de document : texte imprimé Auteurs : Marvin L. Green, Auteur Année de publication : 2001 Article en page(s) : p. 55-62 Note générale : Bibliogr. Langues : Américain (ame) Tags : Industrie  automobile  Matériau  revêtement  Peinture  Vernis  Liant  Formulation  Polymère  fonctionnel  Carbamate  organique  Composé  volatil  Feuil  Propriété  physique  mécanique  haute  teneur  solide Index. décimale : 667.9 Revêtements et enduits Résumé : Polymers and oligomers having carbamate functional groups have been used in a variety of curable coating compositions. Carbamate functional polymers offer many advantages for automotive topcoats, such as outstanding resistance to environmental etching, scratching and marring, humidity, and UV exposure. Hydrophobic carbamate oligomers suitable for crosslinking with standard amino resins were synthesized and formulated into stable one-pack automotive clearcoats with low volatile organic compound (VOC) and excellent physical properties. Because of their unusually steep thermal viscosity curves, these oligomers are particularly adaptable to hot spray techniques that enable coatings in the 85-90% weight solids range to be applied with conventional electrostatic mini-bells. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5739 [article]

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Surface-tension-driven flows of coatings : Bondline readout formation / Richard H. J. Blunk in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 73, N° 918 (07/2001)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 73, N° 918 (07/2001) . - p. 63-71 Titre : Surface-tension-driven flows of coatings : Bondline readout formation Type de document : texte imprimé Auteurs : Richard H. J. Blunk, Auteur ; James O. Wilkes, Auteur Année de publication : 2001 Article en page(s) : p. 63-71 Note générale : Bibliogr. Langues : Américain (ame) Tags : Industrie  automobile  Matériau  revêtement  Peinture  Vernis  Formation  film  Etalement  Défaut  Tension  superficielle  Ecoulement Index. décimale : 667.9 Revêtements et enduits Résumé : Bondline readout (BLRO) is a coating defect frequently observed on adhesively bonded, polymeric automotive body panels. This paper addresses ridging BLRO in clearcoats, not optical and mechanical BLRO, which are characterized by metal-flake orientation (dark/light effects) in basecoats and by distortion in substrates, respectively. Ridging BLRO is due to film thickness differences and results from Marangoni-type, surface-tension-driven flows. In this study, the effects of several parameters on BLRO are investigated experimentally. These parameters include initial film thickness, heating rate, viscosity, solvent-to-resin surface-tension ratio, and solvent volatility. The experiments clearly demonstrate three modes of BLRO flow-formation, flow-out, and reformation-that result from competing surface-tension-gradient forces (temperature- versus concentration-induced). Experimental results are used to validate a proposed BLRO mechanism and, in subsequent work, a BLRO-predicting numerical code. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5740 [article]

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Color and appearance : II / Zeno W. Wicks in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 73, N° 918 (07/2001)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 73, N° 918 (07/2001) . - p. 73-81 Titre : Color and appearance : II Type de document : texte imprimé Auteurs : Zeno W. Wicks, Auteur ; Frank N. Jones, Auteur ; S. Peter Pappas, Auteur Année de publication : 2001 Article en page(s) : p. 73-81 Note générale : Bibliogr. Langues : Américain (ame) Tags : Matériau  revêtement  Peinture  Propriété  optique  Feuil  Couleur  Aspect  Observation  visuelle  Source  lumineuse  Contretypage  couleur Index. décimale : 667.9 Revêtements et enduits Résumé : Color and the interrelated topic of gloss are important to the decorative aspects of the use of coatings and, sometimes, to the functional aspects of their use. We have all dealt with color since we were babies, but most people have little understanding of color. Many technical people think of it as an aspect of physics dealing with the distribution of visible light. While that is a factor, color is a psychophysical phenomenon. The difficulty of understanding color can be seen by considering the most rigorous definition of color that has been prepared: Color is that characteristic of light by which an observer may distinguish between two structure-free fields of view of the same size and shape. In effect, it says that color is what is left to distinguish between two objects when all the other variables are removed. Not a very satisfying definition. Color has three components: an observer, a light source, and an object. (The single exception is when the light source is the object being viewed.) There is no color on an uninhabited island. This is not just a semantic statement; color requires an observer. There is no color in the absence of light; in a completely darkened room there is no color, not because you cannot see it, but because it is not there. There must be an object; if you look out the window of a spaceship without looking at a planet or star, there is no color-there is an observer, there is light, but there is no object. Another major factor affecting appearance is surface roughness. If a surface is very smooth, it has a high gloss; if it is rough on a scale below the ability of the eye to resolve the roughness, it has a low gloss. If, however, the roughness can be resolved visually, a film may exhibit brush marks, orange peel, texture, and so forth. Furthermore, there can be a combination of small scale and larger scale roughness, so films can, for example, have a low gloss and brush marks or high gloss and orange peel. The eye can resolve irregularities in surface smoothness of approximately 25 mm, depending on the distance from the object. Adding to the complications, color and gloss interact, changing either changes the other. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5741 [article]

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