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Model for the effects of water on the cationic UV-Curing of cyclohexyl epoxides / Mark D. Soucek in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 75, N° 937 (02/2003)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 75, N° 937 (02/2003) . - p. 49-58 Titre : Model for the effects of water on the cationic UV-Curing of cyclohexyl epoxides Type de document : texte imprimé Auteurs : Mark D. Soucek, Auteur ; J. Chen, Auteur Année de publication : 2003 Article en page(s) : p. 49-58 Note générale : Bibliogr. Langues : Américain (ame) Tags : Cyclohexène  oxyde  dérivé  polymère  Modélisation  Humidité  Réticulation  photochimique  Rayonnement  UV  Durcissement  Peinture  Matériau  revêtement  Epoxyde  résine Index. décimale : 667.9 Revêtements et enduits Résumé : The effect of relative humidity on the photoinduced curing kinetics of cyclohexyl epoxide and epoxide/polyol coating formulations was investigated in real-time using FTIR spectroscopy. In total, five formulations were used in this study, including a cyclohexyl epoxide without polyol, and four with polyols. The polyol formulations were varied with respect to ratio of epoxide to polyol, and molar functionality of the hydroxyl group. The formulations were exposed to a maximum of seven different relative humidities (6, 16, 20, 30, 51, 62, 75 RH). The curing speed and overall conversion of the epoxy group passed through a maxima for all the formulations. The polyol had an effect on the hydrophilicity of the overall formulation. It was also found that water and polyols had a synergistic effect on the UV-curing kinetics, in effect lowering the relative humidity to achieve a maxima. A model for UV-curing mechanisms at low, medium, and high relative humidity was proposed for both systems with and without the polyols. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5598 [article]

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Polyorthoesters for low-VOC coatings / Hisashi Isaka in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 75, N° 937 (02/2003)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 75, N° 937 (02/2003) . - p. 59-65 Titre : Polyorthoesters for low-VOC coatings Type de document : texte imprimé Auteurs : Hisashi Isaka, Auteur ; Yoichi Yonehara, Auteur Année de publication : 2003 Article en page(s) : p. 59-65 Note générale : Bibliogr. Langues : Américain (ame) Tags : Etude  expérimentale  Feuil  Propriété  mécanique  physique  Isocyanate  organique  Réticulation  Durcissement  Hydroxyle  Groupe  fonctionnel  Préparation  Orthoester  Ester  polymère  Liant  Formulation  Peinture  haute  teneur  solide  Matériau  revêtement Index. décimale : 667.9 Revêtements et enduits Résumé : A series of new oligomeric polyorthoesters for low-VOC coatings was prepared by protecting OH groups with orthoester compounds to achieve both low viscosity and excellent compatibility with crosslinking agents. These new oligomeric polyorthoesters were synthesized through a co-condensation reaction among polyol, orthoester, and alpha- or béta-glycol compounds under an acidic condition. Here, the alpha-or béta-glycol compounds were used as stoppers to prevent excessive polymerization. The polyorthoesters can easily be hydrolyzed with atmospheric moisture, and the produced OH groups can react with appropriate crosslinking agents. It is unique in this system that even the stoppers, alpha- or béta-glycol compounds, can react with the crosslinking agents to achieve an extremely low VOC emission. The polyorthoesters cured with polyisocyanate compounds proved to be highly crosslinked polymers showing excellent mechanical properties, chemical resistance, etc. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5607 [article]

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Study of polyester-based coil coatings by using thermal analysis methods / M. Korhonen in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 75, N° 937 (02/2003)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 75, N° 937 (02/2003) . - p. 67-73 Titre : Study of polyester-based coil coatings by using thermal analysis methods Type de document : texte imprimé Auteurs : M. Korhonen, Auteur ; P. Starck, Auteur ; B. Löfgren, Auteur ; P. Mikkilä, Auteur ; O. Hormi, Auteur Année de publication : 2003 Article en page(s) : p. 67-73 Note générale : Bibliogr. Langues : Américain (ame) Tags : Propriété  dynamomécanique  Calorimétrie  différentielle  balayage  rhéologique  Viscoélasticité  Etude  expérimentale  Analyse  thermique  Ester  polymère  Vernis  Durcissement  Coil  coating  Peinture  Matériau  revêtement Index. décimale : 667.9 Revêtements et enduits Résumé : The curing of polyester-based clearcoats has been studied by using thermal analysis methods. Polyester resins are used as raw materials for coil coatings. The aim of this work was to study the viscoelastic properties of coil coatings. Differential scanning calorimetry (DSC) was found to be useful in curing studies of lacquers, for example, to predict conversion as a function of cure time or cure temperature. Dynamic mechanical analysis (DMA) was used to determine the gel times of some clearcoats. The DSC measurements were done with different apparatus and software programs. This study concentrates on the use of these modern techniques to predict the curing and correlation of the results. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5608 [article]

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Use of a chemically modified clay as a replacement for silica in matte coated ink-jet papers / James Edwin Cawthorne in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 75, N° 937 (02/2003)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 75, N° 937 (02/2003) . - p. 75-81 Titre : Use of a chemically modified clay as a replacement for silica in matte coated ink-jet papers Type de document : texte imprimé Auteurs : James Edwin Cawthorne, Auteur ; Margaret K. Joyce, Auteur ; Dan Fleming, Auteur Année de publication : 2003 Article en page(s) : p. 75-81 Note générale : Bibliogr. Langues : Américain (ame) Tags : Impression  jet  encre  Structure  surface  Modification  chimique  Argile  Matière  charge  Couchage  Papier  couché Index. décimale : 667.9 Revêtements et enduits Résumé : New techniques for modifying the surface of ink-jet papers are continuously being developed. The affordability of ink-jet printers has placed them in the forefront of home-use for digital printing technology. Thus, there is a demand on the paper substrate, whether coated or not, to respond to a variety of ink-jet operating conditions, while continuing to yield a product with high print quality. Coating formulations for ink-jet papers currently utilize precipitated or gelled silica with polyvinyl alcohol (PVOH) as the binder. This silica and PVOH formulation generates good optical, surface, and print qualities, yet leaves a lot to be desired from a runnability and coating preparation standpoint. The modified clay pigment offers potential as a substitute particle for the silica pigment in matte grades of ink-jet paper. The modified clay pigment offered significant improvements in coating preparation and runnability. The modified clay, however, could not match silica in producing the surface and bulk coating properties required for generating high print quality without the addition of a cationic additive. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5609 [article]

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