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Surface properties of tannin-impregnated and varnished beech wood after exposure to accelerated weathering / Mesut Yalcin in COLORATION TECHNOLOGY, Vol. 133, N° 4 (08/2017)
[article]
Titre : Surface properties of tannin-impregnated and varnished beech wood after exposure to accelerated weathering Type de document : texte imprimé Auteurs : Mesut Yalcin, Auteur ; Huseyin Pelit, Auteur ; Caglar Akcay, Auteur ; Nevzat Cakicier, Auteur Année de publication : 2017 Article en page(s) : p. 334-340 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse des données
Bois -- Effets du climat
Bois -- Vernis
Colorimétrie
Décoloration
Dureté (matériaux)
Essais accélérés (technologie)
Evaluation
Hêtre
Laine
Matériaux -- Imprégnation
Résistance à l'abrasion
Solutions aqueuses (chimie)
Tanins végétauxIndex. décimale : 667.3 Teinture et impression des tissus Résumé : The aim of this study was to determine selected surface properties of varnished beech wood impregnated with natural extracts after exposure to accelerated weathering. Beech wood samples were impregnated with aqueous solutions of 5 and 10% mimosa (Acacia mollissima) and quebracho (Shinopsis lorentzii) tannins. After weathering, colour changes (?L*, ?a*, ?b*, and ?E*) in addition to scratch resistance and surface hardness values were calculated and evaluated. As a result of the weathering process, greater colour changes (?E*) were detected in the beech wood samples impregnated with tannins compared with the unimpregnated control samples. The least colour change occurred in the Tanalith-E-impregnated samples. Total colour change was adversely affected with tannin impregnation after the weathering processes. In terms of surface hardness and scratch resistance, the highest values were observed in the mimosa-solution-impregnated and control samples. Furthermore, it was found that scratch resistance and hardness values tended to increase during the first period of weathering and decreased thereafter. Regarding surface properties, the best results were obtained when polyurethane varnish was employed compared with the other varnish types. Note de contenu : - EXPERIMENTAL : Wool samples, impregnation, coating, and accelerated weathering - Scratch resistance - Surface hardness - Colour measurements - Data analysis
- RESULTS AND DISCUSSION : Colour changes - Scratch resistance - Surface hardnessDOI : 10.1111/cote.12287 En ligne : https://drive.google.com/file/d/17M6JGQk8pc23daH_js4uXRK1Ti4ON6FR/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28887
in COLORATION TECHNOLOGY > Vol. 133, N° 4 (08/2017) . - p. 334-340[article]Réservation
Réserver ce documentThe effects of tannins on adhesion strength and surface roughness of varnished wood after accelerated weathering / Mesut Yalcin in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 1 (01/2017)
[article]
Titre : The effects of tannins on adhesion strength and surface roughness of varnished wood after accelerated weathering Type de document : texte imprimé Auteurs : Mesut Yalcin, Auteur ; Hediye Ceylan, Auteur Année de publication : 2017 Article en page(s) : p. 185-193 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésion
Angle de contact
Bois -- Vernis
CelluloseLa cellulose est un glucide constitué d'une chaîne linéaire de molécules de D-Glucose (entre 200 et 14 000) et principal constituant des végétaux et en particulier de la paroi de leurs cellules.
Essais accélérés (technologie)
Mimosa et constituants
Polyuréthanes
QuebrachoLe quebracho est un arbre à écorce ligneuse, mesurant 30 mètres de haut, à feuilles tannées et à fleurs tubulées blanches.
Quebracho est l'un des noms communs, en espagnol, d'au moins trois espèces similaires d'arbres originaires du Gran Chaco, en Amérique latine : Schinopsis lorentzii (quebracho colorado santiagueño), de la famille des Anacardiaceae ; Schinopsis balansae (quebracho colorado chaqueño), de la même famille ;
Aspidosperma quebracho-blanco (quebracho blanc), de la famille des Apocynaceae.
Ces trois espèces sont riches en tanin et fournissent un bois très dur, particulièrement résistant. Leur nom provient de l'espagnol quiebrahacha, qui signifie brise-hache.
Rugosité
Tanins
Vernis en phase aqueuseIndex. décimale : 667.9 Revêtements et enduits Résumé : This study evaluated the effect of accelerated weathering on the adhesion strength and surface roughness of beech wood (Fagus orientalis) treated with mimosa and quebracho extracts and coated with polyurethane, water-based, and cellulosic varnishes. Untreated beech wood blocks and beech wood blocks treated with Tanalith-E were used as control samples. Test samples were exposed to accelerated weathering processes of 100 and 300 h. According to the test results, the mean adhesion strength of the wood samples impregnated with mimosa and quebracho tannins decreased by a maximum of 20%, while increases in the mean surface roughness (Ra) were detected. The highest adhesion strength and lowest mean surface roughness were obtained with polyurethane varnish. Moreover, the mean adhesion strength increased with the accelerated weathering up to 100 h and then decreased thereafter. As a result of the weathering process, the mean surface roughness increased and was thus negatively affected. Note de contenu : - MATERIALS AND METHODS : Wood samples and impregnation process - Coating of the wood surfaces - Accelerated weathering tests - Adhesion strength - Surface roughness - Contact angle (CA) measurement - Scanning electron microscopy (SEM) - Statistical analyses
- RESULTS AND DISCUSSION : Retention of wood specimens - Adhesion strength - Surface roughnessDOI : 10.1007/s11998-016-9841-1 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-016-9841-1.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27800
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 14, N° 1 (01/2017) . - p. 185-193[article]Réservation
Réserver ce document