Coating performance on different types of modified wood : natural and artificial weathering results / Laurence Podgorski in SURFACE COATINGS INTERNATIONAL, Vol. 94, 4 (08/2011)  

[article]  inSURFACE COATINGS INTERNATIONAL > Vol. 94, 4 (08/2011) . - p. 139-150 Titre : Coating performance on different types of modified wood : natural and artificial weathering results Type de document : texte imprimé Auteurs : Laurence Podgorski, Auteur ; Gerhard Grüll, Auteur ; Véronique Georges, Auteur ; Michael Truskaller, Auteur ; Susanne Bollmus, Auteur Année de publication : 2011 Article en page(s) : p. 139-150 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bois -- Détérioration Bois -- Effets du climat Bois -- Revêtements protecteurs Essais accélérés (technologie) Index. décimale : 667.9 Revêtements et enduits Résumé : Like other biological materials, wood is susceptible to environmental degradation. When it is exposed outdoors, a complex combination of chemical, mechanical and biological changes contribute to its weathering. Exposure of wood to the weather leads to a depolymerisation of lignin and cellulose ad to a degradation of cellular structure. Note de contenu : - MATERIALS AND METHODS : Wood substrates, modification and treatment - Coatings - Weathering and assessment - RESULTS AND DISCUSSION : Natural weathering at 0° (horizontal exposure) - Natural weathering at 45° (EN-927-3) - Artificial weathering En ligne : https://drive.google.com/file/d/1UbxTUBfcAjzEWu4U7-hulfC_WYCEKJSa/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16310 [article]

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Effect of preweathering, surface roughness, and wood species on the performance of paint and stains / R. Sam Williams in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 66, N° 828 (01/1994)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 66, N° 828 (01/1994) . - p. 109-121 Titre : Effect of preweathering, surface roughness, and wood species on the performance of paint and stains Type de document : texte imprimé Auteurs : R. Sam Williams, Auteur ; William C. Feist, Auteur Année de publication : 1994 Article en page(s) : p. 109-121 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Bois -- Effets du climat Bois -- Revêtements protecteurs Lasures Revêtements:Peinture Rugosité Tests d'efficacité Vernis Index. décimale : 667.9 Revêtements et enduits Résumé : To quantify the effect of preweathering of new wood surfaces on subsequent finish performance, unfinished wood siding was exposed outdoors for four or eight weeks. Following this preweathering, the specimens were finished with a variety of finishes and placed outdoors again for several years (weathered). The finished specimens were evaluated annually to determine the effect of preweathering on finish performance. The durabilities of 30 different finish systems, consisting of six finishes and five substrates, were evaluated over a five-year period. The wood species were primarily hardwoods and dense softwoods. For these dense species, which weather slowly, a few weeks of preweathering decreased paint performance. The effect of preweathering varied depending on the lenght of time the siding was preweathered, wood species, surface roughness, and finish. The results of the weathering were compared with the results of adhesion testing of similar panels preweathered before finishing. Note de contenu : - RESULTS AND DISCUSSION : Semitransparent stains - Acrylic latex primer and topcoat - Alkyd primer and acrylic latex topcoat - Alkyd primer and topcoat - Solid-color stains - Finish durability - Adhesion tests and durability Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18754 [article]

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FTIR studies of the effects of outdoor exposure on varnish-coated wood pretreated with CCB or water repellents / Mustafa Kemal Yalinkilic in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 71, N° 895 (08/1999)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 71, N° 895 (08/1999) . - p. 103-112 Titre : FTIR studies of the effects of outdoor exposure on varnish-coated wood pretreated with CCB or water repellents Type de document : texte imprimé Auteurs : Mustafa Kemal Yalinkilic, Auteur ; Yuji Imamura, Auteur ; Munezoh Takahashi, Auteur ; Rifat Ilhan, Auteur ; Ahmet Cihangir Yalinkilic, Auteur ; Zafer Demirci, Auteur Année de publication : 1999 Article en page(s) : p. 103-112 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Bois -- Conservation Bois -- Effets du climat Bois -- Revêtements protecteurs Bore Chrome Climat Cuivre Fourier, Spectroscopie infrarouge à transformée de Hydrophobie Matériaux -- Imprégnation Vernis Index. décimale : 667.9 Revêtements et enduits Résumé : Scots pine (Pinus sylvestris L.) and chestnut (Castanea sativa Mill.) panels were coated with a polyurethane or an alkyd-based synthetic varnish. Some of the panels were impregnated with chromium-copper-boron (CCB) or the varnishes themselves before coating, as preservative-coating or water repellent (WR)-coating combination treatments, respectively. Earlier drastic changes in the intensity of the bands assigned to lignin and their shifts to some other stretching points were mostly attributed to chemical modification of lignin with the chromium in CCB, as well as the previously reported high color stability of CCB-impregnated wood. IR spectra of the nine months of weathering indicated that the synthetic varnish coating of non-impregnated or CCB-impregnated wood limited the reactions in lignin compared with polyurethane coating. Wood density and structural difference also seemed to play an important role since changes in lignin were mostly observed after six months of exposure for chestnut wood. Therefore, chemical reactions of CCB-wood cell wall components on the surface appeared likely to be affected from varnish type (their relative absorbency and distribution of sunlight), wood species (density and extractive substances), and exposure time and conditions. Note de contenu : - EXPERIMENTAL : Chemicals, impregnation process, and coating systems - Outdoor exposure - Infrared (IR) Spectral analysis - RESULTS AND DISCUSSION : Weight gain - IR spectral analysis Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17927 [article]

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Surface properties of impregnated and varnished Scots pine wood after accelerated weathering / Ergun Baysal in COLORATION TECHNOLOGY, Vol. 130, N° 2 (04/2014)  

[article]  inCOLORATION TECHNOLOGY > Vol. 130, N° 2 (04/2014) . - p. 140-146 Titre : Surface properties of impregnated and varnished Scots pine wood after accelerated weathering Type de document : texte imprimé Auteurs : Ergun Baysal, Auteur ; Eylem Dizman Tomak, Auteur ; Musa Ozbey, Auteur ; Ebedin Altin, Auteur Année de publication : 2014 Article en page(s) : p. 140-146 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bois -- Conservation Bois -- Effets du climat Bois -- Revêtements protecteurs Brillance (optique) Colorimétrie Dureté (matériaux) Essais accélérés (technologie) Pins et constituants Polyuréthanes Surfaces -- Analyse Vernis Index. décimale : 667.3 Teinture et impression des tissus Résumé : In this study, the effect of accelerated weathering on the surface properties of Scots pine specimens impregnated with wolmanit-CB, tanalith-E, and adolit-KD5 and coated with synthetic and polyurethane varnishes was investigated by measuring surface hardness, glossiness, and colour. Results showed that weathering caused an increase in the hardness of impregnated and varnished specimens, while it caused a decrease in the glossiness of specimens. Surfaces became rougher and darker after weathering in comparison with the initial surfaces of wood specimens. Positive values of the chromatic coordinates indicated that the wood surfaces changed from their original colour to a reddish and yellowish colour. The highest colour change was detected in the specimens coated with polyurethane varnish alone. Both copper-based wood preservative treatment and varnish coating improved the surface properties of specimens in comparison with the surface properties observed on specimens coated with varnish alone. Note de contenu : - EXPERIMENTAL : Preparation of test specimens and wood preservative - Impregnation with wood preservatives - Coating of the wood surfaced - Accelerated weathering test - Surface hardness measurements - Glossiness measurements - Colour measurements - Statistical test - RESULTS AND DISCUSSION : Surface hardness - Glossiness - Colour changes DOI : 10.1111/cote.12070 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12070 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20870 [article]

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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]  inCOLORATION TECHNOLOGY > Vol. 133, N° 4 (08/2017) . - p. 334-340 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 végétaux Index. 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 hardness DOI : 10.1111/cote.12287 En ligne : https://drive.google.com/file/d/17M6JGQk8pc23daH_js4uXRK1Ti4ON6FR/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28887 [article]

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