UV curing of aqueous polyurethane acrylate dispersions. A comparative study by real-time FTIR spectroscopy and pilot scale curing / Armin Tauber in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 72, N° 911 (12/2000)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 72, N° 911 (12/2000) . - p. 51-60 Titre : UV curing of aqueous polyurethane acrylate dispersions. A comparative study by real-time FTIR spectroscopy and pilot scale curing Type de document : texte imprimé Auteurs : Armin Tauber, Auteur ; Tom Scherzer, Auteur ; Reiner Mehnert, Auteur Année de publication : 2000 Article en page(s) : p. 51-60 Note générale : Bibliogr. Langues : Américain (ame) Tags : Revêtement  Peinture  eau  Durcissement  Rayonnement  UV  Dispersion  aqueuse  Uréthanne  polymère  Acrylate  Spectrométrie  IR  Transformation  Fourier  Temps  réel  Echelle  pilote  Etude  comparative  Photoamorceur  expérimentale Index. décimale : 667.9 Revêtements et enduits Résumé : Real-time FTIR spectroscopy was used to study the chemical and physical factors, e.g., photoinitiator and temperature, affecting the UV curing of dried films from aqueous polyurethane acrylate dispersions. Poor conversion of the acrylate double bonds (67%) observed at room temperature can be overcome by irradiation at elevated temperatures. At 353 K almost complete conversion is observed, even with reduced photoinitiator content. Single or multiple UV-light flash experiments were performed to simulate technical parameters, e.g., cure speed and number of required UV lamps, with the help of RTIR spectroscopy. The results obtained were confirmed by pilot-scale UV curing experiments: one or, at most, two UV lamps of high intensity are sufficient for the curing process with respect to the double-bond conversion. The coatings based on the polyurethane acrylate dispersion show low sensitivity towards oxygen from air. Moreover, in comparison to UV curing under inert nitrogen atmosphere, a small positive effect on the conversion in the presence of air has been observed, which might be due to the contribution of peroxyl radicals or their decomposition products to curing. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5586 [article]

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UV curing of a pressure sensitive adhesive coating studied by real - time ftir spectroscopy and laboratory scale curing experiments / Armin Tauber in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 74, N° 927 (04/2002)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 74, N° 927 (04/2002) . - p. 41-47 Titre : UV curing of a pressure sensitive adhesive coating studied by real - time ftir spectroscopy and laboratory scale curing experiments Type de document : texte imprimé Auteurs : Armin Tauber, Auteur ; Tom Scherzer, Auteur ; Ingeborg Weib, Auteur ; Reiner Mehnert, Auteur Année de publication : 2002 Article en page(s) : p. 41-47 Note générale : Bibliogr. Langues : Américain (ame) Tags : Etude  expérimentale  Temps  réel  Transformation  Fourier  Spectrométrie  IR  Rayonnement  UV  Réticulation  Durcissement  Autoadhésif Index. décimale : 667.9 Revêtements et enduits Résumé : Real-time FTIR spectroscopy was used to study the UV-light induced crosslinking of a pressure sensitive adhesive based on a saturated acrylic polymer bearing a photoreactive functional group in the side chain. To simulate production parameters, e.g., cure speed and number of required UV lamps, single or multiple UV-light flash experiments were performed which have shown that the amount of crosslinked polymer chains in the adhesive depends on the applied UV dose. The same result was observed by varying the intensity of the UV-light. The properties of the pressure sensitive adhesive, e.g., peel and shear strength, were determined by UV curing using a laboratory irradiation unit. These results were compared with those of the RTIR spectroscopy experiments. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5666 [article]

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