Evaluation of a method to determine discoloration of paints on wood due to tannin staining from knots / E. Suttie in SURFACE COATINGS INTERNATIONAL. PART B : COATINGS TRANSACTIONS, Vol. 87, B1 (02/2004)  

[article]  inSURFACE COATINGS INTERNATIONAL. PART B : COATINGS TRANSACTIONS > Vol. 87, B1 (02/2004) . - p. 57-61 Titre : Evaluation of a method to determine discoloration of paints on wood due to tannin staining from knots Type de document : texte imprimé Auteurs : E. Suttie, Auteur ; J. Ekstedt, Auteur Année de publication : 2004 Article en page(s) : p. 57-61 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bois -- Revêtements:Bois -- Peinture Décoloration Evaluation Revêtements -- Détérioration:Peinture -- Détérioration Tanins Index. décimale : 667.9 Revêtements et enduits Résumé : The natural exposure and water absorption tests carried out within European Standard EN927 use clear, knot-free wood in order to minimise variability in the results. However, knots are common in practice in many coated timber components, and it is widely acknowledged that the performance of paints can be compromised over knots or timbers that possess a high tannin content. As part of the European Standard for evaluating the performance of coatings on wood, a validated method is required for evaluating the discoloration due to tannin staining and resin exudation from knots. CEN/TC139 Working Group 2 has been charged with identifying a reliable method of testing for tannin stain resistance and producing a standard; identified as EN927-7 'Resistance to tannin staining'. This paper presents results from two laboratories on an evaluation of a Trätek standard procedure. Results of discoloration are presented for panels containing knots that have been coated with one of two test coatings. Reflectance spectrometry and digital imaging-based methods of evaluating discoloration were used and an interpretation of the comparability of the techniques is provided. The suitability of the method for promoting to WG2 as a standard is presented on the basis of these results. Note de contenu : - EXPERIMENTAL : QUV with spray - QUV without spray - Window exposure - RESULTS AND DISCUSSION : Overall performance of coatings in QUV weathering - Overall performance of coatings behind glass - Table 1 : Range of colour change (ΔE) values across the five replicates for each laboratory at six days of exposure in the UQV weathering device - Table 2 : Colour change (ΔE) mean values and standard deviations (sd) DOI : 10.1007/BF02699566 En ligne : https://link.springer.com/content/pdf/10.1007/BF02699566.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5503 [article]

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Influence of coating system composition on moisture dynamic performance of coated wood / J. Ekstedt in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 75, N° 938 (03/2003)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 75, N° 938 (03/2003) . - p. 27-37 Titre : Influence of coating system composition on moisture dynamic performance of coated wood Type de document : texte imprimé Auteurs : J. Ekstedt, Auteur Année de publication : 2003 Article en page(s) : p. 27-37 Note générale : Bibliogr. Langues : Américain (ame) Tags : Etude  expérimentale  Corps  gras  végétal  Huile  lin  Liant  Formulation  Acrylique  dérivé  polymère  Alkyde  résine  Absorption  eau  Peinture  émulsion  Perméabilité  Feuil  Propriété  physique  Bois  Utilisation  Matériau  revêtement Index. décimale : 667.9 Revêtements et enduits Résumé : Model coatings with known composition were assessed for liquid water permeability both as single coat systems and combined as primers and topcoats to form regularly used coating systems - in total 38 different systems. The water permeability of the coatings, expressed as water absorption value, was measured by a method similar to the method that now is proposed as a European standard for the assessment of liquid water permeability. During artificial weathering, the samples were measured for a water absorption value, thus showing the change in water permeability as a function of weathering. The study has shown that an excess of surfactants in the alkyd emulsions has a negative effect on the coating's ability to exclude water from the test samples. A waterborne acrylic paint based on a dispersion of larger particle size (0.4 µm) showed a poor ability to exclude water compared to a similar paint based on smaller dispersion particles (0.1 µm). The alkyd emulsion paints, as single coats, showed high water absorption values compared to solventborne paints and acrylic paints. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5594 [article]

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Integrated life-cycle design of coatings on exterior wood / L. Strömberg in SURFACE COATINGS INTERNATIONAL. PART B : COATINGS TRANSACTIONS, Vol. 87, B2 (06/2004)  

[article]  inSURFACE COATINGS INTERNATIONAL. PART B : COATINGS TRANSACTIONS > Vol. 87, B2 (06/2004) . - p. 121-125 Titre : Integrated life-cycle design of coatings on exterior wood : Part 1: Service life planning Type de document : texte imprimé Auteurs : L. Strömberg, Auteur ; J. Ekstedt, Auteur Année de publication : 2004 Article en page(s) : p. 121-125 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bois -- Revêtements protecteurs Durée de vie (Ingénierie) Enrobage (technologie) Evaluation Lasures Polyacryliques Polyalkydes Revêtement en phase solvant Revêtements -- Propriétés physiques Revêtements en phase aqueuse Statistique Index. décimale : 667.9 Revêtements et enduits Résumé : In this study, the statistical distribution of the reference service life of exterior wood coatings has been calculated for two coating systems: an alkyd oil and a solvent-borne alkyd (stain). The estimated service life has been evaluated, based on exposure tests and on the assessment of experts for another three coating systems (namely a solvent-borne alkyd coating, a water-borne acrylic coating, and a water-borne acrylic stain). It has been shown that the combination of a standard procedure for the measurement of cracking and statistical tools, such as reliability-based methodologies, for predicting the service life of coating systems gives more information regarding reference service life data than purely by a measurement of cracking. Note de contenu : - EXPERIMENTAL : Materials - Methods - Calculations - RESULTS AND DISCUSSION : Statistical analysis - Table 1 : Physical properties of coatings - Table 2 : The coating systems - Table 3 : Cracking scores for the radial-cut and tangential-cut samples for the alkyd oil and for the alkyd stain - Table 4 : The calculated reference service life for the alkyd oil and the alkyd stain - Table 5 : The estimated service life for the water-borne acrylic stain, the water-borne acrylic coating and the solvent-borne alkyd coating DOI : 10.1007/BF02699606 En ligne : https://link.springer.com/content/pdf/10.1007/BF02699606.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5472 [article]

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Liquid water permeability of exterior wood coatings - Testing according to a proposed European standard method / J. Ekstedt in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 73, N° 914 (03/2001)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 73, N° 914 (03/2001) . - p. 53-59 Titre : Liquid water permeability of exterior wood coatings - Testing according to a proposed European standard method Type de document : texte imprimé Auteurs : J. Ekstedt, Auteur ; Gunilla Östberg, Auteur Année de publication : 2001 Article en page(s) : p. 53-59 Note générale : Bibliogr. Langues : Américain (ame) Tags : Bois  Protection  Extérieur  Matériau  revêtement  Peinture  Vernis  Propriété  physique  Feuil  Perméabilité  eau  Essai  Norme  CEN  Absorption  vieillissement  accéléré Index. décimale : 667.9 Revêtements et enduits Résumé : The proposed European standard method for the assessment of liquid water permeability, prEN 927-5, gives significant differences in water absorption values for different types of paints on wood. The proposed limits in the performance standard for the water absorption values for coatings to be used in different types of construction seem to be at acceptable levels. There is a good correlation between the level of water absorption and outdoor experience of the performance of the paints. Aging can drastically influence the water protection properties of the coating. Some sort of aging of the samples is needed in the assessment of the water absorption properties of coatings. An artificial aging procedure is proposed in this paper. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5722 [article]

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