Wettability and bonding quality of exterior coatings on jabon and sengon wood surfaces / Wayan Darmawan in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 1 (01/2018)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 1 (01/2018) . - p. 95–104 Titre : Wettability and bonding quality of exterior coatings on jabon and sengon wood surfaces Type de document : texte imprimé Auteurs : Wayan Darmawan, Auteur ; Dodi Nandika, Auteur ; Evi Noviyanti ; Irsan Alipraja ; Dumasari Lumongga ; Douglas Gardner ; Philippe Gérardin Année de publication : 2018 Article en page(s) : p. 95–104 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Angle de contact Bois -- Vernis Bois extérieurs Liaisons chimiques Mouillabilité Polyacryliques Polyalkydes Ponçage Traîtements de surface Index. décimale : 667.9 Revêtements et enduits Résumé : Wettability and bonding quality of exterior coatings on fast-growing wood surfaces were studied. Samples of air-dried flat-grained (tangential surface) and edge-grained (radial surface) pattern of jabon (Anthocephalus cadamba) and sengon (Paraserianthes falcataria) woods were used. Before application of exterior coatings, the surfaces of the lumber samples were sanded. To provide wood surfaces with various degrees of roughness, abrasive papers of 120, 240, and 360 grits were used for the surface preparation. The wettability of two exterior coatings (water-based acrylic and oil-based alkyd varnishes) on the sanded wood surfaces was measured using a sessile drop contact angle method. The Shi and Gardner (S/G) model was used to evaluate and compare the wettability of the surface coatings on the wood. The sanded wood samples were coated with the two coatings (two layers each). Bonding quality of the coating layers was measured using a crosscut tape test method. Experimental results show that constant contact angle change rate (K value) of the S/G model decreased as the grit number of abrasive paper increased. This indicates that the wettability decreased as the roughness of the surface decreased (surface becomes smoother). There was no evidence of differences in wettability between tangential and radial wood surfaces. The oil-based alkyd coating generated better wettability compared to the water-based acrylic. The crosscut tests showed that the bonding quality of the coating films on both jabon and sengon wood decreased as the surface became smoother. The sengon wood compared to jabon wood provided better coating wettability and bonding quality. Wettability in terms of the K values was a good indication for determining the bonding quality of the two varnish layers. Note de contenu : - MATERIALS AND METHODS : Roughness (Ra) measurement - Contact angle measurement - Determination equilibrium contact angle and constant contact angle change rate - Coating application and bonding quality test - Statistical analysis - RESULTS AND DISCUSSION : Equilibrium contact angle - Wettability - Varnish coating type - Sanded wood surface - Jaban and sengon wood - Bonding quality of varnish coatings - Wettability and bonding quality DOI : 10.1007/s11998-017-9954-1 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-9954-1.pdf Format de la ressource électronique : pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30089 [article]

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