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Application equipment for high quality appearance powder coatings, especially for automotive clear topcoats / Kenzo Yanagida in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 68, N° 859 (08/1996)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 68, N° 859 (08/1996) . - p. 47-56 Titre : Application equipment for high quality appearance powder coatings, especially for automotive clear topcoats Type de document : texte imprimé Auteurs : Kenzo Yanagida, Auteur ; Mitsuyoshi Kumata, Auteur ; Masashiro Yamamoto, Auteur Année de publication : 1996 Article en page(s) : p. 47-56 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Automobiles -- Revêtements:Automobiles -- Peinture Revêtements -- Finition Revêtements poudre:Peinture poudre Vernis Index. décimale : 667.9 Revêtements et enduits Résumé : Recently developed fine powder can provide a quality appearance as good as that obtained with solvent-based coatings. However, if such a fine powder is applied as it is, several problems occur due to the inherent cohesiveness of powder. The purpose of this study is to overcome these problems, to develop the optimum powder coating system to apply fine powder, and to realize the commercial application of the coating system for automotive body topcoats. Note de contenu : - EXPERIMENTAL : Evaluation of stability of new powder feed system - Measurement of transfer efficiency - Evaluation of appearance - RESULTS AND DISCUSSION : Effect of new powder feed system - Effect of new powder coating system equipped with pre-charge system - Effect of new powder coating system equipped with free ion trap - Effect of new powder coating system equipped with external electric field reinforcing system - Effect of new spray nozzle on dispersion of agglomerated particles Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18366 [article]

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Rheology modifiers for low VOC bake coatings / Sheila Westerveld in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 68, N° 859 (08/1996)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 68, N° 859 (08/1996) . - p. 57-65 Titre : Rheology modifiers for low VOC bake coatings Type de document : texte imprimé Auteurs : Sheila Westerveld, Auteur ; Rudy Berndlmaier, Auteur ; Daniel Weadock ; Henry. R. Stoner, Auteur ; Janis. W. Anderson, Auteur ; Ashok Khokhani, Auteur ; Jim McGrath, Auteur ; Richard Swenson, Auteur Année de publication : 1996 Article en page(s) : p. 57-65 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Epaississants Polymères Revêtements en phase aqueuse -- Additifs:Peinture en phase aqueuse -- Additifs Rhéologie Index. décimale : 667.9 Revêtements et enduits Résumé : The Technical Committee of the New York Society for Coatings Technology investigated commercially available additives for their influence on the rheology of low volatile organic compounds (VOC) coatings. These rheology modifiers are important because coatings manufacturers must change their formulations in order to comply with government VOC regulations. The committee solicited samples of rheology modifiers from 15 commercial manufacturers. They were tested in both water and solvent-based low VOC coating systems. The committee received rheology modifiers from 14 generic types. Standard bake enamels using these rheology modifiers were prepared in water and solvent-based systems. The paints were considered for degree of sag, pigment suspension, sprayability, and specular gloss. Sprayability was evaluated and compared with three methods of viscosity determination for possible trend developments and predictions. Note de contenu : - EXPERIMENTAL PROCEDURE : Formulation method - Physical testing method - RESULTS : Incorporation - Sprayability - Viscosity - Settling - Sagging - Gloss - Hardness - CONCLUSIONS : Water-based formula - Solvent-based formula - Optimization Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18429 [article]

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Performance optimization of 100% solids, UV-cure inks and wood fillers using aluminum trihydroxide (ATH) filler / N. R. Dando in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 68, N° 859 (08/1996)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 68, N° 859 (08/1996) . - p. 67-72 Titre : Performance optimization of 100% solids, UV-cure inks and wood fillers using aluminum trihydroxide (ATH) filler Type de document : texte imprimé Auteurs : N. R. Dando, Auteur ; P. L. Kolek, Auteur ; T. R. Clever, Auteur ; E. S. Martin, Auteur Année de publication : 1996 Article en page(s) : p. 67-72 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Bois Brillance (optique) Charges (matériaux) Couches minces Couleur Encre Encre -- Séchage sous rayonnement ultraviolet Hydroxyde d'aluminium Matériaux -- Propriétés optiques Panneaux de particules Réticulation (polymérisation) Revêtements Index. décimale : 667.9 Revêtements et enduits Résumé : This paper employs differential photocalorimetry, color, gloss, and physical test measures to characterize the effects of aluminum trihydrate (ATH) loading (from 13 to 56% by weight) on the ultra-violet (UV) transparency, enthalpy of cure, and cure kinetics of pigmented and unpigmented UV-cure inks and wood fillers. The thixotropic properties and relatively low opacity of ATH allows the use of significant loading levels without whitening pigmented inks or opacifying clear wood fillers. This work demonstrates how increased loadings of ATH, a UV transparent filler, can be employed to increase fully-cured coating thicknesses of UV-cure coatings for a given cure irradiance, and increase cure kinetics (rate of cure) for a given coating thickness, while also offering substantial cost savings by replacing more expensive components. Note de contenu : - EXPERIMENTAL : Preparation and curing of UV-cured films - Color and gloss measures - Differential photocalorimetry - UV-visible spectroscopy - RESULT AND DISCUSSION : Red UV-cure screen printing ink - UV-cure high speed wood filler Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18430 [article]

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Electrochemical impedance spectroscopy evaluation of various aluminum pretreatments painted with epoxy primer / Stephen. M. Cohen in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 68, N° 859 (08/1996)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 68, N° 859 (08/1996) . - p. 73-81 Titre : Electrochemical impedance spectroscopy evaluation of various aluminum pretreatments painted with epoxy primer Type de document : texte imprimé Auteurs : Stephen. M. Cohen, Auteur Année de publication : 1996 Article en page(s) : p. 73-81 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Alliages Couches minces Diélectriques Epoxydes Matériaux -- Propriétés électriques Métaux -- Oxydation anodique Porosité Primaire (revêtement) Spectroscopie d'impédance électrochimique Traîtements de surface Index. décimale : 667.9 Revêtements et enduits Résumé : Panels of aerospace aluminum (Al) alloys 2024 (UNS A92024) and 7075 (UNS A97075) were coated with four pretreatments (thin-film sulfuric-acid [H2SO4] anodization, chromic-acid anodization, and two commercial silica-based gels). Some of these panels were painted with chromated epoxy primer (MIL-P-23377D). All panels were subjected to several months of monitoring by electrochemical impedance spectroscopy (EIS) at open-circuit potential. Several panels were also subjected to EIS measurements made at various applied potentials. Equivalent circuit simulations indicate that a model like that proposed by van Westing, et al., which includes four time-constants (coating, pore, double-layer, and pretreatments) fits the data well. The epoxy primer is shown to be a highly porous, non-barrier coating. Note de contenu : RESULT AND DISCUSSION : Equivalent circuit used - Dielectric constant and barrier properties of the primer - Dielectric properties of the underlying pretreatment - Measurements under distilled water - Polarization measurements Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18431 [article]

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High-Solids coatings using benzylanilinium sulfonates-II a,a-dimethylbenzylpyridinium p-toluenesulfonate, an effective blocked sulfonic acid / S. Nakano in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 68, N° 859 (08/1996)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 68, N° 859 (08/1996) . - p. 83-90 Titre : High-Solids coatings using benzylanilinium sulfonates-II a,a-dimethylbenzylpyridinium p-toluenesulfonate, an effective blocked sulfonic acid Type de document : texte imprimé Auteurs : S. Nakano, Auteur ; T. Morimoto, Auteur ; T. Endo, Auteur Année de publication : 1996 Article en page(s) : p. 83-90 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Ammoniums quaternaires -- Composés Benzène -- Dérivés Catalyseurs Haut extrait sec 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. Réticulation (polymérisation) Stabilité au stockage Sulfonates Index. décimale : 667.9 Revêtements et enduits Résumé : α,α-Dimethylbenzylpyridinium ρ-toluenesulfonate (1), a new class of blocked sulfonic acids, was synthesized in good yield and some properties of 1 were compared with those of N-(ρ-methoxybenzyl)-N,N-dimethylanilinium ρ-toluenesulfonate (2), an effective blocked sulfonic acid. 1H-NMR analysis showed that 1 and 2 were able to release the corresponding amine blocked ρ-toluenesulfonic acid during the reaction with H2O and that the unblocking temperatures were 80°C and 75°C, respectively. Consequently, each aqueous solution turned acidic from neutral around 80°C. Furthermore, the hydrolysis properties of 1 and 2 were estimated by measuring the rate of hydrolysis for 1 and 2. It was found that the 1 activation energy (Ea) was higher than the 2 Ea during hydrolysis. Consequently, 1 showed better thermal latency than 2. Note de contenu : - EXPERIMENTAL : Synthesis of pyridinium SbF6 (5) - Synthesis of a,a-dimethylbenzylpyridinium SbF6 (1) - Measurement of pH of the aqueous solutions - Estimation of rate of hydrolysis - Estimation of unblocking temperatures - Synthesis of the acrylic polyol - Formulation of clear coating solutions - Evaluation of crosslinking reaction - Evaluation of storage stability - RESULTS AND DISCUSSION : Synthesis of benzylpyridinium salts (1) - Synthesis of benzylanilinium sulfonates (2) - Temperature dependency of pH for aqueous solution containing catalysts - Stability of catalysts in aqueous solution - Rate of hydrolysis of catalysts - Unblocking reaction of catalysts - Properties of coating solutions - Crosslinking reaction of coating solutions - Storage stability of coating solutions Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18439 [article]

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