Adjusting UV-assisted rheology / Tobias Sommer in EUROPEAN COATINGS JOURNAL (ECJ), N° 7-8 (07-08/2022)  

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 7-8 (07-08/2022) . - p. 42-46 Titre : Adjusting UV-assisted rheology : Curing process of UV-curable inkjet inks can be improved and thus the migration potential of harmful photoinitiators can be significantly reduced Type de document : texte imprimé Auteurs : Tobias Sommer, Auteur ; Felipe Wolff Fabris, Auteur ; Christopher Giehl, Auteur ; Anton Paar, Auteur Année de publication : 2022 Article en page(s) : p. 42-46 Langues : Anglais (eng) Catégories : Emballages Encre -- Séchage sous rayonnement ultraviolet Encre jet d'encre Granulométrie Photoamorceurs (chimie) Photoréticulation Pigments Rhéologie Index. décimale : 667.9 Revêtements et enduits Résumé : The development of radiation-curing inkjet inks, such as low-migration inks for the packaging industry, represents a demanding process. At the same time, however, this also increases the need for quality assurance and characterisation methods that are adapted to the actual curing process. UV-assisted rheology has great potential for this. Note de contenu : - Measurement methodology - A question of formulation - Curing reaction : particle size - Curing reaction : pigments - Curing reaction : initiators - Curing reaction : irradiation intensity En ligne : https://drive.google.com/file/d/19GBeTOxKnW5IT6TTTZtiPHrC4e9Xsrrz/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38024 [article]

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Determining rheological behaviour of paints, iks and coatings / Oliver Sack in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 209, N° 4654 (09/2019)  

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 209, N° 4654 (09/2019) . - p. 20-21 Titre : Determining rheological behaviour of paints, iks and coatings Type de document : texte imprimé Auteurs : Oliver Sack, Auteur ; Anton Paar, Auteur Année de publication : 2019 Article en page(s) : p. 20-21 Langues : Anglais (eng) Catégories : Encre Revêtements organiques Revêtements:Peinture Rhéologie Rhéomètres Tags : Rhéomètre  'Expériences  de  rotation'  oscillatoires'  'Balayage  d'amplitude'  'Décomposition  structurelle'  'Reprise  structurelle''Test  temps  à  3  intervalles' Index. décimale : 667.9 Revêtements et enduits Résumé : Understanding rheological properties of paints, inks and coatings is of great importance for many industrial applications, such as manufacturing, processing and curing/hardening. Simple rotational experiments like shear stress-(CS) and shear rate (CR) controlled tests give only information about the viscosity value, the "seeming" yield point and the thixotropic effect. Since it is known for many years, that these values are not sufficient to describe the complex visco-elastic properties of paints, the use of more sensitive rheometers is recommended fora better understanding of the rheological characterisation. Modern air bearing-based rheometers provide the possibility to perform rotational tests, as well as oscillatory shear measurements. Measurements which are carried out under oscillatory shear conditions, provide advantages for characterising liquid and cured (film) paints and coatings. In addition, the curing or hardening process can be investigated and the glass transition point (Tg) can be determined. The most common used oscillatory experiments are the amplitude sweep (AS), frequency sweep (FS) and the structural recovery test (31TT). While the AS is used to determine the yield/flow point and the structural strength, the FS provides information about the sedimentation stability of the material. 31TT-tests are used to describe the levelling and sagging behaviour after the application process, as well as the thixotropic effect (time dependent structural recovery). Curing and hardening processes can not only be performed time and temperature controlled but also under UV exposure. For this reason, an air bearing-based rheometer is essential to avoid any shear influences to the 3-dimensional structures that corne up during the curing process. Compared to a viscometer, a modern rheometer system can be used fora full rheological characterisation of paints, inks and coatings.The generated data provide a deeper view inside the structure of the materials and help to understand and improve the manufacturing process and applicational problems. Note de contenu : - Rotational experiments - state of the art - Oscillatory experiments - modern methods - Structural decomposition and regeneration - Fig. 1 : Silver 3 (organoclay), silver 1 (acrylic thickener) and silver 3 (polyurethane thickener) - Fig. 2 : Shows the viscosity curves of the three different paints. Over the shear rate range between 0.1 to 10005-1 the samples show much higher viscosity values compared to lower shear rates - Fig. 3 : Amplitude sweeps of the three different silver coatings - Fig. 4 : 3-Interval-Time-Tests (3ITT) of three different silver coatings En ligne : https://drive.google.com/file/d/12NXSuASvepHIkB7w7qqmvK3o3ZKW9Sxy/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32917 [article]

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Functionalised powder coatings for polymers / Andreas Rank in EUROPEAN COATINGS JOURNAL (ECJ), N° 11 (11/2021)  

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 11 (11/2021) . - p. 22-26 Titre : Functionalised powder coatings for polymers : Using nanomaterials to improve crucial surface properties Type de document : texte imprimé Auteurs : Andreas Rank, Auteur ; Felipe Wolff Fabris, Auteur ; Timothy Aschl, Auteur ; Anton Paar, Auteur Année de publication : 2021 Article en page(s) : p. 22-26 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alumine Angle de contact Antimicrobiens Antiviraux Argent Dioxyde de silicium Dioxyde de titane Energie de surface Essais (technologie) Fluidisation Hydrophobie Nanoparticules Polycarbonates Résistance à l'abrasion Revêtements poudre Surfaces fonctionnelles Index. décimale : 668.4 Plastiques, vinyles Résumé : By incorporating nanoparticles into a low-temperature powder coating it is possible to specifically modify polymer surface properties and impact fluidisation and application. However, the nanoparticle type and concentration affect powder properties such as cohesion strength, fluidisation point and air-holding capacity in different ways and must be investigated and validated to avoid problems in production. Note de contenu : - Nano-modified coating to improve functionality - Testing set-up - Positive influence on key properties - Powder coating experiments - Superhydrophobic properties dependent upon nanomaterial - Strong antimicrobial effect - Good antiviral effect - Enhanced scratch resistance - Table 1 : Cohesion strength, air-holding capacity and fluidisation points of the modified powder coatings - Table 2 : Contact angle of the polycarbonate reference and the coated substrates - Table 3 : Surface energies of the powder coatings - Table 4 : Antimicrobial test results - Table 5 : Antiviral test results for the powder-coated samples - Table 6 : Summary scratch resistance of the modified powder coating En ligne : https://drive.google.com/file/d/1FkfZ_NBw9a1Er8qfq7gBT6kTx1nI4cPu/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36479 [article]

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