Alternative radiation sources in UV curing / Reiner Mehnert in EUROPEAN COATINGS JOURNAL (ECJ), (05/2024)  

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > (05/2024) . - p. 40-44 Titre : Alternative radiation sources in UV curing : UV curing without mercury lamps : Realistic or not ? Type de document : texte imprimé Auteurs : Reiner Mehnert, Auteur ; Thomas Riedel, Auteur ; Thorsten Herbert, Auteur Année de publication : 2024 Article en page(s) : p. 40-44 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Diodes électroluminescentes Lampes à excimère Photoréticulation Polyacrylates Revêtements -- Séchage sous rayonnement ultraviolet Index. décimale : 667.9 Revêtements et enduits Résumé : The manufacture of mercury medium pressure lamps could be banned in the EU from 24 Februay 2027. UV curing with the combination of excimer lamp/LED under nitrogen is shown to be an energy-efficient and therefore economical alternative to UV curing with mercury lamps in air. Irradiation systems consisting of excimer lamps, LEDs and inert chambers are available and ready for use. Note de contenu : - Surface and depth curing as important parameters of UV curing - Comparison of the degree of cross-linking - Functional principle and structure of noble gas halogen excimer lamps - Inertisation during UV curing with the excimer lamp/led combination - Table 1 : Conversion of the acrylate double bonds of a UV coating when curing with medium-pressure mercury lamps, noble gas halogen excimer lamps and the combination excimer lamp/LED - Table 2 : UV curing under nitrogen at oxygen concentrations of 0.5 to 1.5 % En ligne : https://drive.google.com/file/d/1-r2KPSmLXXaroMovl4MG5WwMIIeG30Wv/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40890 [article]

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Process control in UV curing : in-line monitoring of the acrylate conversion by near-infrared spectroscopy / Tom Scherzer in COATINGS TECH, Vol. 3, N° 8 (08/2006)  

[article]  inCOATINGS TECH > Vol. 3, N° 8 (08/2006) . - p. 30-37 Titre : Process control in UV curing : in-line monitoring of the acrylate conversion by near-infrared spectroscopy Type de document : texte imprimé Auteurs : Tom Scherzer, Auteur ; Sabine Muller, Auteur ; Reiner Mehnert, Auteur Année de publication : 2006 Article en page(s) : p. 30-37 Note générale : bibliogr. Langues : Américain (ame) Index. décimale : 667.9 Revêtements et enduits Résumé : The conversion of double bonds in UV-cured acrylic coatings on various substrates was followed in-line by near-infrared (NIR) reflection spectroscopy. Quantitative data were obtained directly from the intensity of the acrylic overtone band at 1620 nm, which allows very easy calibration of the method. The custom-made probe head of the NIR spectrometer was fitted to several pilot-scale coatings and curing lines, and the conversion was determined in clear and pigmented coatings as well as in scratch-resistant nanocomposite layers on the basis of acrylates. It was shown that reasonable conversion data can be obtained with sufficient time resolution at line speeds of at least 120 m/min. Furthermore, the method has been proven to be useful for the monitoring of the conversion in layers from hot-melt adhesives for PSA applications. Thus, for the first time there is an analytical method available which can be reliably applied for process and quality control in technical curing processes. En ligne : https://drive.google.com/file/d/1__z0NjWObZq552oTNkL4b5kIHFYvPVJ-/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5484 [article]

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Silanes and inorganic particles / Björn Borup in EUROPEAN COATINGS JOURNAL (ECJ), N° 6/03 (06/2003)  

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 6/03 (06/2003) . - p. 21-27 Titre : Silanes and inorganic particles : The winning combination for scratch and abrasion resistant coatings Type de document : texte imprimé Auteurs : Björn Borup, Auteur ; Roland Edelmann, Auteur ; Reiner Mehnert, Auteur Année de publication : 2003 Article en page(s) : p. 21-27 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Résumé : Requirements on surface material are especially exigent in wooden floorings. In an effort to introduce a coating with a new level of use resistance, a new system based on inorganic nanoparticles and silanes is presented. Silane technology allows for the incorporation of up to 30% (w/w) fumed silica in an acrylic resin. This leads to solvent free, UV- or electron beam cured coatings with an increased scratch and abrasion resistance. En ligne : https://drive.google.com/file/d/1nH_QD_m08HZB6A7FMtuhT8EFmmOBQPTD/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9018 [article]

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Soft and hard - hand in hand / Nikolaus Manolikakes in EUROPEAN COATINGS JOURNAL (ECJ), N° 9 (09/2021)

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 9 (09/2021) . - p. 32-36 Titre : Soft and hard - hand in hand : Uv-cured soft-touch coatings which are scratch and chemical resistant can be generated via process steps of uv precuring, excimer-irradiation and uv-final curing Type de document : texte imprimé Auteurs : Nikolaus Manolikakes, Auteur ; Reiner Mehnert, Auteur ; Rolf Schubert, Auteur Année de publication : 2021 Article en page(s) : p. 32-36 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Formulation (Génie chimique) Lampes à excimère Résistance à l'abrasion Résistance chimique Toucher soft Vernis Vernis -- Séchage sous rayonnement ultraviolet Index. décimale : 667.7 Cires, laques, vernis Résumé : Soft-touch surfaces give a soft haptic feeling when touched with fingers. For those surface structures it is differed between velvety, silky and rubbery soft-touch effect. This ef¬fect can animate to touch, play with and buying a product. Note de contenu : - Soft-touch through precuring and excimer matting - Basic formulations of soft-touch varnishes - Scratch resistant soft-touch coatings - Fig. 1 : process steps for the creation of soft-houch surfaces wi[h 100 % UV systems - Fig. 2 : Structure of a surface generated by 172 nm excimer, Finer structure with soft-touch haptics through precuring and following excimer irradiation - Fig. 3 : Surface of a 30 pm thick sort-houch coating with the ure¬thane acrylates CN996 and CN9301 after scratching with an Erich¬sen diamond needle according to EN 438-2 at loads of 1 to 5 N - Fig. 4 : Surface of a 30 pm thick soft-touch coating with the urethane acrylate 5001500E after scratching with an Erichsen diamond needle according to EN 438-2 at loads of 1 to 5 N - Fig. 5 : Characherisahion of scratch resistance of sofh-rouch coatings hhrough penehrahion depths, which were measured affer per-forming scratches with an Erichsen diamond needle according ho EN 438-2 ah loads of 1 ho 5 N Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36267 [article]

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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)

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UV curing of white cationic flexographic inks / Tom Scherzer in EUROPEAN COATINGS JOURNAL (ECJ), N° 6/99 (06/1999)  

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