Depth profile of UV-induced wood surface degradation / V. Jirous-Rajkovic in SURFACE COATINGS INTERNATIONAL. PART B : COATINGS TRANSACTIONS, Vol. 87, B4 (12/2004)  

[article]  inSURFACE COATINGS INTERNATIONAL. PART B : COATINGS TRANSACTIONS > Vol. 87, B4 (12/2004) . - p. 241-247 Titre : Depth profile of UV-induced wood surface degradation Type de document : texte imprimé Auteurs : V. Jirous-Rajkovic, Auteur ; H. Turkulin, Auteur ; E. R. Miller, Auteur Année de publication : 2004 Article en page(s) : p. 241-247 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bois -- Détérioration Bois -- Effets du rayonnement ultraviolet Bois -- Teinture Essais accélérés (technologie) Essais dynamiques Lasures Photostabilisants Résistance à la traction Sapins Traitement chimique Index. décimale : 667.9 Revêtements et enduits Résumé : The depth profile of weathering effects on wood was studied after the laboratory ultraviolet exposure of fir-wood. The ‘thin strip’ method (ie the measurement of changes in tensile properties of microtomed wood sections) was modified in terms of exposure of batches of strips packed in bundles and exposed in a QUV apparatus. The bundles of strips were exposed untreated, covered with surface strips that had been impregnated with chromium (VI) trioxide or Fe(III) nitrate, or protected with free films of clear stain with photostabilisers and without photostabilisers. It has been shown that ultraviolet (UV) light penetrates the fir-wood surface to a depth greater than 70µm, resulting in changes in the tensile strength of the fir-wood strips to a depth of 70 to 140µm. Strength changes in lower levels (down to 280µm from the surface) could not be clearly attributed to a predominant effect of UV light, and were probably controlled by hydrolytic processes. 100 hours of exposure enabled the effectiveness of several treatments to be established. The clear stain, enriched with a UV absorber (Tinuvin 1130. Ciba) and a hindered amine light stabiliser (HALS compound type) (Tinuvin 292, Ciba), was shown to offer the best protection of the treatments studied. Impregnation with aqueous solutions of chromium (VI) trioxide and Fe(III) nitrate proved ineffective in photostabilising the wood surface. Note de contenu : - EXPERIMENTAL : Materials - Tensile strength measurements - MATERIALS AND SUPPLIERS : Chemical treatments - Preparation of free films of coatings - Composing the bundles of thin strips - Artificial weathering - Cutting of strips (or preparing the test specimens) - Table 1 : Composition of strip packs - Table 2 : The effect of a ferric nitrate and chromium oxide treatments on the tensile strength of thin fir-wood strips before and after UV-exposure in a QUV artificial weathering tester for 100 hours and 5OO hours DOI : 10.1007/BF02699671 En ligne : https://link.springer.com/content/pdf/10.1007/BF02699671.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5443 [article]

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