Critical view on the possibility of color changes prediction in the surfaces of painted wood exposed outdoors using accelerated weathering in Xenotest / Milos Panek in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 2 (03/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 2 (03/2019) . - p. 339-352 Titre : Critical view on the possibility of color changes prediction in the surfaces of painted wood exposed outdoors using accelerated weathering in Xenotest Type de document : texte imprimé Auteurs : Milos Panek, Auteur ; Ladislav Reinprecht, Auteur Année de publication : 2019 Article en page(s) : p. 339-352 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Bois -- Revêtements protecteurs Climat Couleur Décoloration Essais accélérés (technologie) Microscopie Statistique Index. décimale : 667.9 Revêtements et enduits Résumé : The capability to correlate exactly the process of outdoor natural weathering for the coating systems on wood surfaces via their artificial weathering in laboratory conditions would significantly reduce the testing times. In this work, a weathering of 16 different coating systems applied on two wood species (Norway spruce and black locust) having two different degrees of roughness (smooth, rough) was performed with the aim to compare direction and intensity of their color changes in natural exterior exposure without ground contact lasting from 6 to 36 months and in Xenotest lasting from 1 to 12 weeks, respectively. Correlation relationships between the natural and accelerated weathering of painted woods have been evaluated based on linear regressions for changing of the CIE-L*a*b* color parameters ΔL* and ΔE* and by non-linear Spearman rank correlation of ΔE* values. The results exhibit better possibilities for correlating the color changes for wood painted with pigmented coatings compared to transparent ones. The precision of the employed correlations has also been affected by the underlying wood species and its roughness before application of the coating. This means that, in the modeling of painted wood weathering, it is necessary to take into account a number of other factors in addition to the specific climatic conditions of exposure. Note de contenu : - Wood samples - Coatings systems - Natural and accelerated weathering - Color analyses - Microscopic analyses - Statistical evaluation DOI : 10.1007/s11998-018-0125-9 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0125-9.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32407 [article]

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Effect of artificial weathering and temperature cycling on the performance of coating systems used for wooden windows / Eliska Oberhofnerova in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 4 (07/2018)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 4 (07/2018) . - p. 851-865 Titre : Effect of artificial weathering and temperature cycling on the performance of coating systems used for wooden windows Type de document : texte imprimé Auteurs : Eliska Oberhofnerova, Auteur ; Stepan Hysek, Auteur ; Milos Panek, Auteur ; Martin Böhm, Auteur Année de publication : 2018 Article en page(s) : p. 851-865 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse spectrale Bois -- Revêtements Brillance (optique) -- Mesure Décoloration Essais accélérés (technologie) Microscopie électronique à balayage Polyacrylates Revêtements en phase aqueuse Index. décimale : 667.9 Revêtements et enduits Résumé : The effects of ultraviolet light irradiation and water spray and temperature cycling on the color stability of waterborne coating systems on spruce were investigated. The test samples were treated with three coating systems (white and brown pigmented acrylate waterborne coatings systems with different layering) from six producers. The artificial weathering was carried out based on standardized (504 h) and increased weathering parameters (504 h). Thirty cycles of temperature changes were performed. Discoloration suggesting the rate of degradation process and color stability was measured by a spectrophotometer in L*a*b* color space. The results showed greater color stability of white coating systems during both experiments. The producer of acrylate coatings with iodopropynyl butyl carbamate and permethrin as biocides and benzotriazole, silicon dioxide and methylsiloxane as additives was characterized by the best coatings performance. The most sensitive color parameter to describe the surface quality as a result of irradiation and water spray has proven to be a change of lightness. A tendency towards degradation with increasing lightness was observed during weathering. The effect of temperature itself on color change was minimal. Scanning electron microscopy and energy dispersive spectroscopy revealed microscopic changes of coatings caused by artificial weathering. Note de contenu : - EXPERIMENTAL : Material and coating application - Artificial weathering - Temperature cycling - Color measurements - Gloss measurements - Scanning electron microscopy and energy dispersive spectroscopy - Statistical evaluation - RESULTS AND DISCUSSION : Color changes after artificial weathering test - Color changes after temperature cycling - Gloss measurement - Scanning electron microscopy and energy dispersive spectroscopy DOI : 10.1007/s11998-017-0033-4 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-0033-4.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30862 [article]

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