Evaluation of the ASTM D7869-13 test method to predict the gloss and color retention of premium architectural finishes-I / Kurt Wood in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 5 (09/2018)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 5 (09/2018) . - p. 933-943 Titre : Evaluation of the ASTM D7869-13 test method to predict the gloss and color retention of premium architectural finishes-I Type de document : texte imprimé Auteurs : Kurt Wood, Auteur Année de publication : 2018 Article en page(s) : p. 933-943 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Brillance (optique) Dioxyde de titane Durée de vie (Ingénierie) Essais (technologie) Essais accélérés (technologie) Evaluation Lampe au xénon Polyfluorure de vinylidène Prévision, Théorie de la Résistance aux conditions climatiques Revêtements -- Effets du climat:Peinture -- Effets du climat Revêtements -- Normes:Peinture -- Normes Revêtements en bâtiment:Peinture en bâtiment Index. décimale : 667.9 Revêtements et enduits Résumé : A recently developed xenon arc-based accelerated weathering cycle, ASTM D7869-13, has been validated for automotive and aerospace coatings, but its ability to predict the gloss and color retention of premium architectural finishes has not yet been evaluated. We review new weathering data comparing the performance of poly(vinylidene fluoride) (PVDF) architectural finishes in south Florida exposure as well as several accelerated exposure methods including ASTM D7869-13. ASTM D7869 accurately reproduced Florida rank order gloss and color retention trends for coatings made with PVDF-acrylic blends and inorganic pigments, as well as the gloss and color changes seen in Florida for 70% PVDF masstone coatings made with a number of single organic pigments. However, the D7869 cycle has difficulty predicting the rank order of rutile TiO2 grades for the gloss retention of PVDF coatings in Florida, as well as the magnitude and direction of color fade from organic pigment degradation in organic pigment/inorganic pigment blends. One open question that remains is whether the ASTM D7869 cycle might have some utility for industry standard or specification purposes, if the test is limited to specific reference colors or more ideally to specific reference pigments. Note de contenu : - Experimental - Evaluation of ASTM D7869-13 for PVDF coatings with weatherable inorganic pigments - Evaluation of ASTM D7869-13 for PVDF coatings with TiO2 - Evaluation of ASTM D7869-13 for PVDF coatings with organic pigments DOI : 10.1007/s11998-017-0050-y En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0050-y.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31118 [article]

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Stress development and film formation in multiphase composite latexes / Kyle Price in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 11, N° 6 (11/2014)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 11, N° 6 (11/2014) . - p. 827-839 Titre : Stress development and film formation in multiphase composite latexes Type de document : texte imprimé Auteurs : Kyle Price, Auteur ; Wenjun Wu, Auteur ; Kurt Wood, Auteur ; Stephanie Kong, Auteur ; Alon McCormick, Auteur ; Lorraine F. Francis, Auteur Année de publication : 2014 Article en page(s) : p. 827-839 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse des données Caractérisation Composites Core-Shell Cryotechnique Evaluation Formation de film Latex Liants Microscopie électronique à balayage Morphologie (matériaux) Particules -- Morphologie Revêtement -- Séchage:Peinture -- Séchage Index. décimale : 667.9 Revêtements et enduits Résumé : Designed appropriately, multiphase soft-core/hard-shell latex particles can achieve film formation without the addition of a coalescing aid, while preserving sufficient film hardness. Achieving optimal performance in these materials requires an under-standing of how particle morphology affects film formation and stress development in the film. In this study, soft-core/hard-shell latex particles with different shell ratios, core and shell glass transition temperatures(Tgs), and particle sizes (63–177 nm) were synthesized using a two-stage emulsion polymerization. The film formation behavior of the composite particles was investigated with cryogenic scanning electron micro-scopy, atomic force microscopy, and measurements of the minimum film formation temperature (MFFT). Results show that film formation was enhanced for particles with thinner hard shells, smaller particle size, and a smaller difference in Tg between the core and shell polymers. For example, the MFFT decreased and the particle deformation increased for particles with thinner shells and smaller article sizes. Stress development during drying was characterized using a cantilever beam bending technique. A walled cantilever design was used to monitor stress development without the complication of a lateral drying front. The film formation behavior and stress development correlated well with practical paint properties like scrub resistance and gloss. Note de contenu : - EXPERIMENTAL : Binder evaluation - Paint evaluation - Block resistance - Scrub resistance - Data analysis using JMP - Stress measurement - Characterization methods - RESULTS AND DISCUSSION : Particle morphology - Film formation - Stress development - Paint performance DOI : 10.1007/s11998-014-9606-7 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-014-9606-7.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22307 [article]

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