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Effect of passivation treatment and storing on adhesion and protective properties of lacquered tinplate cans / J. M. Bastidas in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 69, N° 871 (08/1997)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 69, N° 871 (08/1997) . - p. 67-75 Titre : Effect of passivation treatment and storing on adhesion and protective properties of lacquered tinplate cans Type de document : texte imprimé Auteurs : J. M. Bastidas, Auteur ; J. M. Cabanes, Auteur ; R. Catala, Auteur Année de publication : 1997 Article en page(s) : p. 67-75 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésion Aliments -- Emballages Anticorrosion Can coating Emballages métalliques Oxydes de chrome Passivité (Chimie) Vernis Index. décimale : 667.9 Revêtements et enduits Résumé : Tinplate cans internally coated with three commercial lacquer systems were studied. The relationship found between lacquer adhesion, metallic chromium (CrM), chromium oxide (CrOx), and total chromium (CrT) existing in the passivated layer was : adhesion=CrM+10 (CrOx/CrT). The study was completed by conducting electrochemical impedance spectroscopy (EIS) and direct current (DC) polarization experiments up to 410 days. A dilute acetic acid-sodium chloride solution was used as electrolytic and a full opened can was used as the working electrode and an electrolyte cell. Iron dissolution was determined by atomic absorption spectrophotometry (AAS). The EIS, DC, and AAS techniques gave similar results. Passivation treatment did not substantially affect the porosity results. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18264 [article]

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Synthesis of fluorine-containing dispersions and an environmental scanning electron microscope analysis of their morphology when applied to cotton fabrics / Reinhard Linemann in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 69, N° 871 (08/1997)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 69, N° 871 (08/1997) . - p. 77-81 Titre : Synthesis of fluorine-containing dispersions and an environmental scanning electron microscope analysis of their morphology when applied to cotton fabrics Type de document : texte imprimé Auteurs : Reinhard Linemann, Auteur ; Arkadii Gorenberg, Auteur ; Georg Bar, Auteur ; Hans-Joachim Cantow, Auteur ; Rolf Mülhaupt, Auteur Année de publication : 1997 Article en page(s) : p. 77-81 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adsorption Copolymères Copolymères en émulsion Coton Le coton est une fibre végétale qui entoure les graines des cotonniers "véritables"(Gossypium sp.), un arbuste de la famille des Malvacées. Cette fibre est généralement transformée en fil qui est tissé pour fabriquer des tissus. Le coton est la plus importante des fibres naturelles produites dans le monde. Depuis le XIXe siècle, il constitue, grâce aux progrès de l'industrialisation et de l'agronomie, la première fibre textile du monde (près de la moitié de la consommation mondiale de fibres textiles). Fluoropolymères Méthacrylique, Acide L'histoire de l'acide méthacrylique commence en 1865, année où il est synthétisé pour la première fois à partir du méthacrylate d'éthyle. L'acide méthacrylique est très réactif avec les groupes carboxyles, vinyles et esters. Microscopie électronique à balayage Mouillage (chimie des surfaces) Polyaddition Polymères amphiphiles Polymères en émulsion Polyméthacrylates Textiles et tissus -- Finition Index. décimale : 667.9 Revêtements et enduits Résumé : Environmental scanning electron microscopy (ESEM) was used to monitor surface wetting, adsorption and film formation of aqueous fluorine-containing polymer dispersions on cotton fabrics. Performance of such dispersions, useful as water, oil, and soil repellent finishes, was correlated with homopolymer and copolymer composition. In addition to the commercially available. fluorine-containing dispersions (Dipolir® 480) model dispersions of hydrophobic and amphiphilic fluorine-containing polymers were prepared. Amphiphilic copolymer dispersions were obtained by emulsion copolymerizations of perfluorooctylethylmethacrylate with hydrophobic trimethylsilylmethacrylate, which serves as a precursor of the hydrophilic methacrylic acid and permits random incorporation of methacrylic acid upon insitu hydrolysis of poly(perfluorooctylethylmethacrylate-co-trimethylsilylmethacrylate). While poly(perfluorooctylethylmethacrylate) failed to wet cotton surfaces, incorporation of methacrylic acid promoted both wetting and film formation, as evidenced by film bridges between single fibers. Note de contenu : - Materials - Polymerization - Sample preparation - Envionmental scanning electron microscopy (ESEM) - Photon correlation spectroscopy (PCS) Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18265 [article]

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Safety and handling of UV/EB curing materials / Ronald Golden in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 69, N° 871 (08/1997)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 69, N° 871 (08/1997) . - p. 83-89 Titre : Safety and handling of UV/EB curing materials Type de document : texte imprimé Auteurs : Ronald Golden, Auteur Année de publication : 1997 Article en page(s) : p. 83-89 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Colles:Adhésifs Eczéma professionnel Faisceaux électroniques Hygiène du travail Maladies professionnelles Rayonnement ultraviolet Réticulation (polymérisation) Revêtements Sécurité du travail Toxicologie Index. décimale : 667.9 Revêtements et enduits Résumé : Early inexperience with handling acrylates and poor work habits resulted in cases of occupational dermatitis. These incidents and early toxicity testing reports generated concerns and some misconceptions about the safety of UV/EB curing technology.Subsequent testing has shown that earlier concerns about acrylate toxicity were overstated. UV/EB curing materials have low systemic toxicity, and acrylates as a class can not be assumed to be carcinogenic via dermal exposure. Products with unusually severe irritation characteristics have been eliminated from commercial use, and new, less irritating materials are available for formulating UV/EB curing systems.Good industrial hygiene practices, knowledge of safe handling procedures and worker training are essential for safe handling of any chemical. When these principles are followed, experience has shown that UV/EB curing technology can be handled safely in industrial applications. Note de contenu : - HISTORICAL PERSPECTIVE - PHYSICAL HAZARDS OF UV/EB TECHNOLOGY : Non-ionizing (ultraviolet) radiation - Ionizing (electron beam) radiation - Ozone - UV/EB MATERIALS - TOXICITY OF UV/EB CURING MATERIALS : Acrylate acute toxicity - Acrylate chronic toxicity - Cycloaliphatic epoxy toxicity - Photoinitiators and additives - MINIMIZING THE RISK OF DERMATITIS - EYE PROTECTION - PREMATURE POLYMERIZATION, MATERIAL STORAGE, AND TRANSFER - CLEANING UP SPILLS - REGULATORY CONSIDERATIONS - WORKER TRAINING - COMPARISON BETWEEN SOLVENT AND UV/EB SYSTEMS Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18293 [article]

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Powder coatings / Josef H. Jilek in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 69, N° 871 (08/1997)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 69, N° 871 (08/1997) . - p. 91-94 Titre : Powder coatings Type de document : texte imprimé Auteurs : Josef H. Jilek, Auteur Année de publication : 1997 Article en page(s) : p. 91-94 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 667.9 Revêtements et enduits Résumé : The coatings industry has recognized the need and desirability to reduce energy consumption and solvent emission for many years. This led to the development of several new coating technologies which differed in their composition, application method, and curing mechanism from their traditional solvent-based counterparts. Examples are the development of novel epoxy resins for cathodic electroposition paints, the utilization of acrylated urethanes and epoxies in radiation curable coatings, and the production of oligomers with a narrow molecular weight distribution for high solid coatings. Powder coatings, i.e., coatings made entirely from solid components, are also the result of this endeavor, although one of the first patents of a fluidized bed application was granted as early as 1955 in Germany. The pwder coatings of those days were relatively simple compared to today and consisted mainly of powdered thermoplastic polymers, like plasticized PVC or nylon. Later, the thermosetting, I.E, heat curable, powder coatings based on epoxy resins were developed which broadened the range of available materials but the application of the powders remained largely limited to the fluidized bed method. It was not until the early 1960s that the development of the electrostatic spray process provided the necessary breakthrough to make powder coatings a commercially viable alternative to conventional, liquid coatings. It took another 20 years for thermosetting powder coatings to be established and to gain acceptance in the industry. During those years, significant improvements were made not only in the choice of raw materials like resins and hardeners, but also in the quality of equipment. This led to totally automated coating booths, providing more uniform powder delivery and application. Today, thermosetting powder coatings are a rapidly growing, albeit small, segment of the industrial coatings market and their future is exceptionally bright. This is due to the fact that powder coatings are dry paints. They are 100% solid systems containing no solvents, thus little or no volatiles are given off during manufacture, application, and cure. Furthermore, the powder coatings process is predestined to be used in a fully automated fashion and little is wasted during application. Excess or oversprayed material can easily be recovered and recycled and rejects on the coating line are relatively few. Finally, high film thickness of up to 500 microns can be achieved in a single application and the resultant coatings exhibit excellent film properties. Overall, powder coatings offer an almost pollution free and highly aconomical way to coat a wide variety of metal substrates for either a decorative or functional purpose. Note de contenu : - AREAS OF APPLICATION - STARTING FORMULATIONS : Decorative interior applications - Decorative exterior applications - Functional applications - FUTURE OUTLOOK AND CHALLENGES Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18294 [article]

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