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Powder coatings : III / Zeno W. Wicks in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 71, N° 894 (07/1999)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 71, N° 894 (07/1999) . - p. 43-47 Titre : Powder coatings : III Type de document : texte imprimé Auteurs : Zeno W. Wicks, Auteur ; Frank N. Jones, Auteur ; S. Peter Pappas, Auteur Année de publication : 1999 Article en page(s) : p. 43-47 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Procédés de fabrication Qualité -- Contrôle Revêtements poudre:Peinture poudre Index. décimale : 667.9 Revêtements et enduits Résumé : Powder coating is undergoing rapid growth. Worldwide production of powder coatings in 1996 was estimated to be about 450,000 metric tons. Powder coatings are used most extensively in Europe and Japan; North American production in 1996 was estimated to be 110,000 metric to,s. The general principle is to formulate a coating from solid components, melt mix them, disperse pigments (and other insoluble components) in a matrix of the major binder components, and pulverize the formulation. The powder is applied to the substrate, usually metal, and fused to a continuous film by baking. Thermosettng and thermoplastic powders are available ; the major portion of the market (>90%) is for thermosetting types. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17880 [article]

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Cure of secondary carbamate groups by melamine-formaldehyde resins / H. P. Higginbottom in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 71, N° 894 (07/1999)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 71, N° 894 (07/1999) . - p. 49-69 Titre : Cure of secondary carbamate groups by melamine-formaldehyde resins Type de document : texte imprimé Auteurs : H. P. Higginbottom, Auteur ; G. R. Bowers, Auteur ; Patricia E. Ferrell, Auteur ; Loren W. Hill, Auteur Année de publication : 1999 Article en page(s) : p. 49-69 Note générale : Bibliogr. Langues : Américain (ame) Tags : 'Matériau  revêtement'  Peinture  Thermodurcissable  Durcissement  'Groupe  fonctionnel'  Carbamate  Réticulation  Réticulant  'Mélamine  résine'  Formaldéhyde  Aminoplaste  'Mécanisme  réaction'  Feuil  'Propriété  dynamomécanique'  'Etude  expérimentale' Index. décimale : 667.9 Revêtements et enduits Résumé : Melamine-formaldehyde (MF) resins have been used as crosslinkers for hydroxyl-functional co-reactants in thermoset coatings for about 60 years. Crosslink densities of films prepared from oligomeric urethane polyols suggested that the methoxymethyl groups of MF resins could react with urethane groups (i.e., secondary carbamate groups) as well as reacting with hydroxyl groups. Co-reactants that contain secondary carbamate groups and no hydroxyl groups have been prepared with several types of backbone structures. Cure of such co-reactants by MF resins has been studied using a gradient oven with determination of impact resistance, solvent resistance, and hardness. Several formulations from these cure profile sets have been selected for crosslink density determinations by dynamic mechanical analysis (DMA). Crosslink densities of cured films are consistent with complete conversion of secondary carbamate groups at temperatures only slightly higher than those used for cure of hydroxyl groups. The -OH groups on certain acrylic polyols were converted to secondary carbamate groups. The original acrylic and the converted acrylic were both cured with MF resins. Acid resistance was much better for films prepared from the acrylic that contained secondary carbamate groups. Note de contenu : - RESULTS AND DISCUSSION : Synthesis and characterization of secondary carbamate co-reactants - Cure response of model carbamates in a gradient oven test - Dynamic mechanical analysis of films from selected co-reactants - Secondary carbamate groups on the same backbone - Effect of melamine crosslinker structure on cure of secondary carbamates - MF cure of aqueous polyurethane dispersions Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17912 [article]

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Photocuring activity of several commercial, near UV activated photoinitiators in clear and pigmented systems / J. Segurola in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 71, N° 894 (07/1999)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 71, N° 894 (07/1999) . - p. 61-67 Titre : Photocuring activity of several commercial, near UV activated photoinitiators in clear and pigmented systems Type de document : texte imprimé Auteurs : J. Segurola, Auteur ; N. S. Allen, Auteur ; M. Edge, Auteur ; Aitor Parrondo, Auteur ; Ian Roberts, Auteur Année de publication : 1999 Article en page(s) : p. 61-67 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Amorceurs (chimie) Encre Photochimie Rayonnement ultraviolet Réticulation (polymérisation) Revêtements Spectrométrie infrarouge Spectroscopie ultraviolette Vernis Index. décimale : 667.9 Revêtements et enduits Résumé : Some of the most important commercial near UV photoinitiators have been analyzed by UV spectroscopy to evaluate the type of electronic transitions occurring upon absorption of light. Photocuring studies have been undertaken by real time infrared spectroscopy (RTIR) in clear and pigmented (black, magenta, cyan, and yellow) systems with UV and visible light at different photoinitiator concentrations in the presence of air. Generally, the Type I photofragmenting photoinitiators appear to operate more effectively under UV excitation when compared with the Type II thioxanthones, especially in pigmented systems. There is a reasonable correlation between the UV and visible absorption properties of the respective initiators and their overlap with the excitation source. Note de contenu : - TYPE I PHOTOINITIATORS : Alpha-cleavage photoinitiators - Alpha-aminoalkylphenones - Acylphosphine oxides - TYPE II PHOTOINITIATORS : Thioxanthones - EXPERIMENTAL : Materials - UV Spectroscopy - Real time infrared spectroscopy RTIR - RESULTS AND DISCUSSION : UV Spectroscopy results - Photopolymerization results Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17913 [article]

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UV-curable, special coding inks for optical fibers / Gexing Shen in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 71, N° 894 (07/1999)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 71, N° 894 (07/1999) . - p. 69-72 Titre : UV-curable, special coding inks for optical fibers Type de document : texte imprimé Auteurs : Gexing Shen, Auteur ; Wanneng She, Auteur ; Xiouning Qu, Auteur ; Xiaomeng Yu, Auteur ; Qunzhen Sun, Auteur ; Wei Liu, Auteur ; Ron Giachen, Auteur Année de publication : 1999 Article en page(s) : p. 69-72 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Codage Encre -- Séchage sous rayonnement ultraviolet Fibres optiques Formulation (Génie chimique) Liants Polyacrylates Réticulation (polymérisation) Revêtements Index. décimale : 667.9 Revêtements et enduits Résumé : A UV-curable, special coding ink for optical fibers consists chiefly of UV-curable prepolymers, coloring materials, and a photoinitiator. The UV-curable prepolymers are silicone epoxy benzoic acrylate (SEBA) and alicyclic hydrocarbon epoxy acrylate (ACEA). The coloring materials are disperse red urethane acrylate (RUA), disperse blue urethane acrylate (BUA), acridine yellow urethane acrylate (YUA), or their mixtures. The relationships of component-property of UV-curable, special coding inks were studied. The typical UV-curable, special coding inks were used to color the optical fibers. Note de contenu : - EXPERIMENTAL : Materials and reagents - Syntheses - Preparation of UV-curable special coding inks - Preparation of cured films - RESULTS AND DISCUSSION : Effect of UV-curable prepolymer compositions on properties - Effect of photocurable dyes on properties - Gel and solvent resistance of UV-curable ink - Adhesion of UV-curable ink to optical fibers - Typical characteristics of UV-curable, special coding inks for optical fibers Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17914 [article]

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Application of digital image analyses to measure print quality / William Lim in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 71, N° 894 (07/1999)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 71, N° 894 (07/1999) . - p. 73-78 Titre : Application of digital image analyses to measure print quality Type de document : texte imprimé Auteurs : William Lim, Auteur ; Suresh Mani, Auteur Année de publication : 1999 Article en page(s) : p. 73-78 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse qualitative (chimie) Etalonnage Imagerie numérique Impression numérique Lecteurs optiques Mesure -- Instruments Index. décimale : 667.4 Encres Résumé : The digital image analyses method is capable of objective and reproducible measurements of print mottle. The results of the scanner calibration test show improved consistency in the mottle values between different scanners. This would allow many locations to have their own analysis station without compromising a "universal" measurement. The mottle measurements of the Heidelberg standards correspond to the visual ranking. The robustness of the scanner method was shown by tests of prints on different substrates. Finally, a modified version of the analysis shows that halftone prints can also be tested. The method described here shows good agreement with the Tobias mottle tester. Note de contenu : - Mottle measurement - EXPERIMENTAL : Calibration tests for universal measurements - RESULTS : Scanner-to-scanner consistency - Effect of the calibration on consistency of a single scanner - DISCUSSION : Heidelberg standards measured - Cryovac poultry films measured - Rohm and Haas halftone prints Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17916 [article]

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