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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]
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
RhéomètresTags : 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 coatingsEn ligne : https://drive.google.com/file/d/12NXSuASvepHIkB7w7qqmvK3o3ZKW9Sxy/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32917
in POLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 209, N° 4654 (09/2019) . - p. 20-21[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 21175 - Périodique Bibliothèque principale Documentaires Disponible In-vivo measurements of free radicals in human skin / Leonhard Zastrow in IFSCC MAGAZINE, Vol. 6, N° 4 (10-11-12/2003)
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Titre : In-vivo measurements of free radicals in human skin Type de document : texte imprimé Auteurs : Leonhard Zastrow, Auteur ; Thomas Herrling, Auteur ; Lawrence J. Berliner, Auteur ; Louis Ferrero, Auteur ; Norbert Groth, Auteur Année de publication : 2003 Article en page(s) : p. 295-301 Note générale : Bibliogr. Langues : Anglais (eng) Tags : 'Radicaux libres' Résonance spin électronique' 'Nitroxide étiquette par rotation' 'Irradiation UVA-UVB' Index. décimale : 668.5 Parfums et cosmétiques Résumé : UVA-UVB generated free radicals in human skin were measured by Electron Spin Resonance (ESR) spectroscopy and imaging. The short lifetime of the generated free radicals and reactive oxygen species like •OH−; O2-• and L• demands the application of spin traps (nitroxide spin labels) for scavenging and accumulating to get a sufficient Signal-to-Noise ratio. The ESR spectroscopy and imaging measurements showed that the free radicals in skin were mainly generated in the dermal layer by UVA. Using ESR measurements, the protective effect of different UVB-UVA filter combinations and antioxidants in the skin could be clearly assessed. The used microwave frequencies of 9.5 GHz (λ=350-600 nm) and 3 GHz (λ=9.5 nm) enabled an undisturbed investigation of the whole skin up to the lower dermis in contrast to optical detection methods that are more limited in depth (λ=350-600 nm). ESR spectroscopy is a valuable method for the evaluation of the UV-protection capacity of sunscreen products. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10552
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Code-barres Cote Support Localisation Section Disponibilité 003881 - Périodique Bibliothèque principale Documentaires Disponible Le rotomoulage vise de plus grandes séries / F. X. Lenoir in PLASTIQUES & ELASTOMERES MAGAZINE, N° 53-5 (06-07/2001)
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Titre : Le rotomoulage vise de plus grandes séries Type de document : texte imprimé Auteurs : F. X. Lenoir, Auteur Année de publication : 2001 Article en page(s) : p. 8-11 Langues : Français (fre) Tags : Polymère Thermoplastique 'Procédé fabrication' 'Moulage rotation' 'Amélioration procédé' 'Equipement mise en œuvre' 'Production masse' Index. décimale : 668.4 Plastiques, vinyles Résumé : Pour aborder des marchés plus industriels, le rotomoulage évolue sur presque tous les plans: la matière, les moules, les moyens de chauffage, les machines, l'alimentation et les moyens de contrôle. Des avancées sont notables sur le moussage, les multicouches et la maîtrise des épaisseurs en dessous de 3 mm. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=14046
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Code-barres Cote Support Localisation Section Disponibilité 000861 - Périodique Bibliothèque principale Documentaires Disponible