The race for improved weathering / Matt Andersson in EUROPEAN COATINGS JOURNAL (ECJ), N° 1 (01/2021)  

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 1 (01/2021) . - p. 40-43 Titre : The race for improved weathering : A UV analysis technique that speeds up product development Type de document : texte imprimé Auteurs : Matt Andersson, Auteur ; Karl Booth, Auteur Année de publication : 2021 Article en page(s) : p. 40-43 Langues : Anglais (eng) Catégories : Brillance (optique) Caractérisation Fourier, Spectroscopie infrarouge à transformée de Indice carbonyle Photo-oxydation Photodétérioration Rayonnement ultraviolet A Réflexion totale atténuée Résistance aux conditions climatiques Revêtements -- Détérioration Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : New product development and major reformulation of high-durability exterior coatings are among the highest risk projects a coatings lab can undertake. This is due to the years-long exterior exposure time required to validate a new product's performance, in addition to the standard formulation and test cycle time of several months. Many attributes are associated with the assessment of a coating's weatherability, such as grain-crack resistance, adhesion and chalk. In the architecture semi-gloss to high-gloss space, an emphasis has rightly been placed on gloss retention as a distinguishing attribute between high performance and economy product classes. Note de contenu : - Gloss retention today - Gloss retention and photodegradaton - Our improved method : ATR-FTIR characterisation - How we did it - Correlating carbonyl index and cyclic UVA - Accelerating development - Fig. 1 : ATR-FTIR characterisation - Fig. 2 : Assignment of onset of failure by photooxidation - Fig. 3 : Carbonyl index at one week exposure vs onset of gloss failure - Fig. 4a : δcarbonyl index measured after 24hrs cyclic UVA exposure - Fig. 4b : Onset of failure of gloss retentionby cyclic UVA - Fig. 5a : Carbonyl index after seven days exposure - Fig. 4b : Onset of failure of gloss retention by cyclic UVA - Fig. 5b : 168 h measurement of carbonyl index predicts relative performance of commercial HG polymers - Table 1 : Infrared absorption wavelengths for relevant functionalities En ligne : https://drive.google.com/file/d/1cti9HW3V9hdCZ-CucD5b287QTa2OkXg9/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35840 [article]

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