Early rain resistance and surfactant leaching resistant binder / R. Matranga in COATINGS TECH, Vol. 15, N° 8 (08/2018)  

[article]  inCOATINGS TECH > Vol. 15, N° 8 (08/2018) . - p. 50-59 Titre : Early rain resistance and surfactant leaching resistant binder Type de document : texte imprimé Auteurs : R. Matranga, Auteur ; B. Doran, Auteur ; Alan Fream, Auteur ; Christophe Baude, Auteur ; E. Bousseau, Auteur ; Maurille Secher, Auteur Année de publication : 2018 Article en page(s) : p. 50-59 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésion Applications extérieures Essais dynamiques Liants Polyacryliques Résistance à l'efflorescence Résistance à l'exsudation Résistance à l'humidité:Résistance à l'eau Résistance à la fissuration Résistance chimique Revêtement mural:Peinture murale Revêtements en phase aqueuse -- Additifs:Peinture en phase aqueuse -- Additifs Index. décimale : 667.9 Revêtements et enduits Résumé : The development of an effective waterborne technology for exterior paints has become a significant challenge in the architectural coatings market due to the growing expectations of end users (total cost of ownership), diversification of materials used for exterior walls and siding, and the continuous trend towards VOC reduction. This article describes a new product based on our company's Low Exudation Binder (LEB) platform, designed for formulation of exterior paints, where pure acrylic binders are typically used for reasons of excellent color retention in very deep tones. The new binder possesses the advantages common to those of the LEB technology, namely very low surfactant leaching, excellent resistance to efflorescence, and long-term adhesion, and in addition, very early rain resistance, allowing the application window to be extended. Furthermore, paints formulated with the new binder have very low VOC emissions, and are in-line with all the most stringent, current environmental requirements. Note de contenu : - PROBLEMS WITH WATER-BASED MASONRY COATINGS : application and drying - Resistance to early rain - Exudation or surfactant leaching/staining - Other common problems - POLYMER DEVELOPMENT : LEB PLATFORM : Polymer design considerations - Need for pure acrylic version of LEB - EXPERIMENTAL : TEST METHODS : The nature of exudates from water-based paints - Exudation resistance (evaluation of leaching of surfactants and water-soluble components) - Efflorescence resistance - Shower test (evaluation of resistance to early rain) - Q-UV exposure and exterior weathering - Adhesion - Resistance to mud-cracking - Crack test on wood - RESULTS AND DISCUSSION : Analysis of exudates from water-based paints - - APPLICATION OF PF-LEB IN EXTERIOR COATINGS - ASSESSMENT OF LEB WHITE W2 AND LEB DEEP DE PERFORMANCE : Exudation resistance - Efflorescence resistance - Shower resistance - Accelerated durability - Adhesion - Mud-crack resistance - Crack test on wood - Fig. 1 : Optimum application conditions - Fig. 2 : Chromatogram of exudates from standard acrylic based facade paint and same formulation based on the PA-LEB - Fig. 3 : Exudation resistance of white and blue tinted paints - Fig. 4 : Efflorescence resistance on white and deep bases - Fig. 5 : Panels with white bases before and after shower test - Fig. 6 : Panels with deep bases before and after shower test - Fig. 7 : Results of Q-UV exposure - Fig. 8 : Resistance to mu-cracking - Fig. 9 : Results of crack test on wood - Table 1 : Typical characteristics of New PA-LEB - Table 2 : Formulation and characteristics of LEB white W2 and LEB deep D2 for exterior flat - Table 3 : Characteristics of exterior flat paints evaluated in the benchmarking study - Table 4 : Adhesion to non-porous substrates En ligne : https://drive.google.com/file/d/1HRRsX_HEcUkmNT0ZxBEUo8tc4NLrFIdt/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31271 [article]

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How to avoid problems of exudation and efflorescence in semi-flexible exterior masonry coatings / Maurille Secher in DOUBLE LIAISON, N° 606 (09/2015)

[article]  inDOUBLE LIAISON > N° 606 (09/2015) . - p. 16-19 Titre : How to avoid problems of exudation and efflorescence in semi-flexible exterior masonry coatings Type de document : texte imprimé Auteurs : Maurille Secher, Auteur ; E. Bousseau, Auteur ; Christophe Baude, Auteur ; Jean-Marie Schmuck, Auteur Année de publication : 2015 Article en page(s) : p. 16-19 Note générale : L'article, amputé de sa fin est à la page 17 du Double liaison N° 607 d'octobre 2015 Langues : Français (fre) Catégories : Liants Maçonnerie Résistance à l'efflorescence Résistance à l'exsudation Revêtement mural:Peinture murale Revêtements -- Défauts:Peinture -- Défauts Revêtements en bâtiment:Peinture en bâtiment Index. décimale : 667.9 Revêtements et enduits Résumé : The trend for more colourful façades, coupled with the growth of point-of-sale tinting, bas led to increasing issues for paint manufacturers in terms of surfactant leaching or exudation, especially with higher-build, semi-flexible coatings that are naturally binder-rich, due to the high levels of surfactants present in medium and deep tone paints. OMNOVA Solutions has developed an innovative solution for formulation of masonry coatings with excellent resistance to exudation and efflorescence. This new environmentally friendly binder incorporates technology that minimises the amount of water soluble materials that can leach from the coating, and so significantly reduces the possibility of unattractive surface staining occurring under certain unfavourable drying conditions. Additionally, the Low Exudation Binder bas all the advantages of current best-in-class resins for masonry coatings, and has built-in flexibility that gives it more versatility in terms of application, extending its use to formulation of semi-flexible coatings, where crack-bridging ability is a requirement. Note de contenu : - INTRODUCTION : Surfactants in coatings - Problems associated with 'free' surfactants (a. exudation, b. efflorescence) - POLYMER DESIGN CONSIDERATIONS : Exudation & efflorescence - Durability & crack-bridging - MAIN APPLICATIONS OF NEW LEB TECHNOLOGY : High build coatings : definition and experimental formulation - Paint properties : benchmarking vs. commercial references Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24481 [article]

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Sustainable and high performance / Ziniu Yu in COATINGS TECH, Vol. 20, N° 2 (03-04/2023)  

[article]  inCOATINGS TECH > Vol. 20, N° 2 (03-04/2023) . - p. 40-47 Titre : Sustainable and high performance : New biobased acrylic dispersion to prevent knot staining for wood coating Type de document : texte imprimé Auteurs : Ziniu Yu, Auteur Année de publication : 2023 Article en page(s) : p. 40-47 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésion Biomatériaux Bois -- Revêtements Charges (matériaux) Formulation (Génie chimique) Noeuds du bois Polyacryliques Primaire (revêtement) Résistance à l'exsudation Résistance aux taches Ressuage Le contrôle par ressuage (Penetrant Testing en anglais, d'où son abréviation officielle : PT) est une méthode de contrôle non destructif très utilisée dans l'aéronautique, l'industrie de production d'énergie, les transports et les prothèses chirurgicales. Cette méthode permet de mettre en évidence des discontinuités débouchantes (fissure, crique, etc.) sur tout métal, de nombreuses céramiques et de nombreuses pièces composites. Cette méthode de contrôle non destructif (CND) est utilisée dans les fonderies, les forges et les unités d'usinage. Revêtements -- Finition Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : Knots—the circular imperfections in the wood grain—often cause issues in coating appearance due to their high concentration of potent extractives that can degrade a coating system over time. Unfortunately, knots are unavoidable in softwood species, such as pine, which is often used for furniture and cabinetry applications. Knots occur naturally when branches die and become encapsulated as the tree grows. During the encapsulation process, extractives—the tree’s natural resins—seal off the former branch’s location and provide a biological boundary between this area and the rest of the tree. Wood typically contains up to 4 wt % extractives of total weight of the wood. However, in knots, the extractives are concentrated and can reach as high as 40 wt %. When the wood is coated, the knot area is prone to exudate the extractives and bleed through the coating. Combined with the effect of UV radiation oxidizing some of these components, the typical result is brownish discoloration bleeding through the coated surface at the knot area. Figure 1 shows the knots of pinewood, wood extractives, and the resulting knot bleeding effect through the coating. Knot bleeding effects are a problem in the wood coating industry because they can significantly impact the appearance of the coatings, as shown in Figure 1. In addition, bleeding can compromise coating performance, causing a coating to become brittle, crack, or peel. The discoloration over the knots is typically not seen immediately but can take months. The time it takes for the discoloration to appear depends on several factors, including the wood species, environment humidity, temperature, and exposure to UV radiation. Note de contenu : - EXPERIMENTAL : Resins and formulations - Knot bleeding tests - Summary of other tests - TESTING RESULTS AND DISCUSSION : Knot bleeding resistance - Dry-time test - Sandling capability - Adhesion - Block resistance - Table 1 : Knot bleeding resins comparison chart - Table 2 : Wood promer formulations - Table 3 : Resins for topcoats - Table 4 : Topcoat formulations - Table 5 : Summary of tests - Table 6 : Filler studies in primer layer - Table 7 : Primer block resistance test En ligne : https://drive.google.com/file/d/13w9l5CuMy2SGkgC4IX2KLt-v8SqJpRbC/view?usp=drive [...] Format de la ressource électronique : Html Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38969 [article]

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