Keeping rust at bay / Susanne Bender in EUROPEAN COATINGS JOURNAL (ECJ), N° 3 (03/2014)  

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 3 (03/2014) . - p. 36-43 Titre : Keeping rust at bay : UV curing makes waterborne anticorrosive coatings tougher Type de document : texte imprimé Auteurs : Susanne Bender, Auteur ; Norbert Pietschmann, Auteur Année de publication : 2014 Article en page(s) : p. 36-43 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse électrochimique Anticorrosifs Anticorrosion Essais d'adhésion Essais de brouillard salin Formulation (Génie chimique) Liants Pigments Réticulation (polymérisation) Revêtements en phase aqueuse -- Séchage sous rayonnement ultraviolet:Peinture en phase aqueuse -- Séchage sous rayonnement ultraviolet Index. décimale : 667.9 Revêtements et enduits Résumé : Aqueous UV curable coating materials were formulated aiming at anticorrosive coatings. Electrochemical tests helped in making a rapid choice of anticorrosive pigment and corrosion inhibitor. Blends of UV curable and physically drying dispersions gave optimum properties over zinc phosphated steel panels. Note de contenu : - Different types of waterborne UV curing binders - Some aspects of waterbased UV formulation - Experimental procedures in summary - Only certain types of binder pass adhesion test - Initial salt spray tests show poor results - Electrochemical tests help to optimise formulations - Colour pigments have little effect on performance - UV systems show promise for further development En ligne : https://drive.google.com/file/d/1eAGNxzdYiprCV9P_JNlkzhlh7Eb9svja/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20709 [article]

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Photoinitiator efficiency in water-borne UV curable coatings / Norbert Pietschmann in EUROPEAN COATINGS JOURNAL (ECJ), N° 9/99 (09/1999)  

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 9/99 (09/1999) . - p. 60-69 Titre : Photoinitiator efficiency in water-borne UV curable coatings Type de document : texte imprimé Auteurs : Norbert Pietschmann, Auteur Année de publication : 1999 Article en page(s) : p. 60-69 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Résumé : Various photoinitiators were tested in simple clearcoat formulations based on two aqueous UV curable resin emulsions (both unsaturated polyester and polyester acrylate) and on two polyurethane acrylate dispersions. Predrying temperatures, initiator concentrations, and incorporation methods were varied. Pendulum hardness on glass allowed a rapid estimation of the curing results. Crystalline 2-hydroxy-2-methyl-1-[4-(2-hydroxyethoxy)-phenyl] propan-1-one (no. 3 of the initiator types investigated) gave superior curing response especially at lower photoinitiator levels which could be easily incorporated. On the other hand, other photoinitiator types were useful in significantly higher concentrations, too. Thus, they also made possible similar results. Note de contenu : - Experimental: - Different methods to incorporate the photoinitiator - Investigations into polyester emulsions - Polyester acrylate emulsions - Polyurethane acrylate dispersions: - Dispersion C - Dispersion D En ligne : https://drive.google.com/file/d/1rkIfq1ImpndCFZsrRnptau0UDVfXaFAV/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11206 [article]

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Pigmented UV curable materials / Norbert Pietschmann in EUROPEAN COATINGS JOURNAL (ECJ), N° 4/96 (04/1996)

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 4/96 (04/1996) . - p. 204-207 Titre : Pigmented UV curable materials Type de document : texte imprimé Auteurs : Norbert Pietschmann, Auteur Année de publication : 1996 Article en page(s) : p. 204-207 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Résumé : Considering pigmented acrylate formulations the influence of various raw materials, the type of UV radiators, duration of exposure, and film thickness were studied. The criteria used included IR and UV/VIS spectrometry, radioscopy, etc. The size of the free spectral window as an indicator for the curing behaviour was shown to be of restricted relevance to white and coloured lacquers. Additionally, a similar estimate could be made of the pendulum hardness and of the maximal free curable film thickness as compared to the curing behaviour on wood. Moreover, the reflectance of the substrate had a large influence. An optimized mixture of acrylate oligomers with high reactivity and functionality, careful selection of type and amount of the photoinitiator system and stretching of the pigments with extenders permitted the development of white and black coating materials giving opaque films with good through and surface curing. A comparison was also made with reference to polyester systems and to cationically curing compositions. Note de contenu : - Relationships between the spectral window and the curing properties - Pigmented formulations with various binders - Curable film thickness in comparison with other investigations Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11287 [article]

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UV curing of black pigmented coating materials / Norbert Pietschmann in EUROPEAN COATINGS JOURNAL (ECJ), N° 7-8/00 (07-08/2000)

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 7-8/00 (07-08/2000) . - p. 44-52 Titre : UV curing of black pigmented coating materials Type de document : texte imprimé Auteurs : Norbert Pietschmann, Auteur ; Ilse Peter, Auteur ; Peter Stroh, Auteur Année de publication : 2000 Article en page(s) : p. 44-52 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Résumé : Black pigmented UV-curable coating materials intended for application on wood veneer and fibreboard were prepared and used to compare different compositions, e.g., varying pigments. Reactive oligomer/monomer combinations with high acrylate functionality and, thus, an intense chain propagation reaction, a suitable and effective blend of long-wave and short-wave absorbing photoinitiators, and a careful pigment selection as well as a careful adjustment of pigment concentration were necessary to make possible both opacity and through cure. In this context, the combination of the black pigment with certain extenders can be helpful. On wooden substrates good results were achieved with both a carbon black of larger particle size, and aniline black (at ten times the pigment content). In contrast, formulations containing a standard fluffy carbon black (which gives very good colour strength and jetness in conventional and water-borne coatings) failed with respect to curability. However, formulations with aniline black also showed excellent jetness and brilliancy. Note de contenu : 1. The experiments at a glance 2. Introductory investigations and formulation principles 3. Improvements of formulations : Influence of the formulation on through cure and surface cure - Oxygen inhibition can lead to poor scratch resistance - Good results can be obtained when extenders are added - Attempts to find an optimised photoinitiator system 4. In conclusion - problems can be solved, with some limitations Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11016 [article]

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