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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]
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 chimiqueIndex. 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 hoursDOI : 10.1007/BF02699671 En ligne : https://link.springer.com/content/pdf/10.1007/BF02699671.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5443
in SURFACE COATINGS INTERNATIONAL. PART B : COATINGS TRANSACTIONS > Vol. 87, B4 (12/2004) . - p. 241-247[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 000718 - Périodique Bibliothèque principale Documentaires Disponible The efficiency of various treatments in protecting wood surfaces against weathering / V. Jirous-Rajkovic in SURFACE COATINGS INTERNATIONAL. PART B : COATINGS TRANSACTIONS, Vol. 87, B1 (02/2004)
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Titre : The efficiency of various treatments in protecting wood surfaces against weathering Type de document : texte imprimé Auteurs : V. Jirous-Rajkovic, Auteur ; D. Radovan, Auteur ; A. Bogner, Auteur Année de publication : 2004 Article en page(s) : p. 15-19 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bois -- Détérioration
Bois -- Revêtements protecteurs
Bois -- Vernis
Bois extérieurs
Essais accélérés (technologie)
Essais d'adhésion
Lasures
Nitrate de fer
Photostabilisants
Résistance aux conditions climatiques
Revêtements organiques
Stabilisant à la lumière de type amine encombrée
Traitement chimiqueIndex. décimale : 667.9 Revêtements et enduits Résumé : Wood exposed to the outdoors undergoes photo-oxidative degradation in a natural weathering process.
The efficacy of various treatments for the protection of wood surfaces from weathering elements (ultraviolet radiation and water) was investigated by using the measurements of the changes in adhesion on fir and oak samples after their exposure to natural climatic conditions and after accelerated weathering.
The most efficacious of the six UV-protective treatments proved to be the treatment of the wood surfaces with a semi-transparent stain, followed by treatments with a transparent wood stain containing two types of photostabilisers. The stabilisation of the wood surfaces by ferric nitrate did not improve the performance of the wood stain used.Note de contenu : - Wood samples
- Chemical treatments
- Coatings
- Accelerated weathering
- Natural weathering
- Adhesion testing
- Table 1 : Sample codes and description of the treatments
- Table 2 : Mean adhesive strength (MPa) and standard deviations of samples after QUV exposure
- Table 3 : Mean adhesive strength (MPa) and standard deviations of samples after natural exposureDOI : 10.1007/BF02699559 En ligne : https://link.springer.com/content/pdf/10.1007/BF02699559.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5477
in SURFACE COATINGS INTERNATIONAL. PART B : COATINGS TRANSACTIONS > Vol. 87, B1 (02/2004) . - p. 15-19[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 000392 - Périodique Bibliothèque principale Documentaires Disponible