Formulation high-performance waterborne acrylic : Direct-to-metal coatings under 25 g/L VOC / Kathleen Auld in COATINGS TECH, Vol. 17, N° 9 (09/2020)  

[article]  inCOATINGS TECH > Vol. 17, N° 9 (09/2020) . - p. 20-29 Titre : Formulation high-performance waterborne acrylic : Direct-to-metal coatings under 25 g/L VOC Type de document : texte imprimé Auteurs : Kathleen Auld, Auteur ; Matthew Padaon, Auteur ; Leo J. Procopio, Auteur Année de publication : 2020 Article en page(s) : p. 20-29 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésion Anticorrosifs Anticorrosion Application directe sur le métal Essais de brouillard salin Formation de film Formulation (Génie chimique) Polyacryliques Résistance à l'humidité Revêtements en phase aqueuse Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : Waterborne direct-to-metal (DTM) coatings for the protection of steel infrastructure are currently in demand because they allow the end user to reduce volatile organic compound (VOC) emissions, promote higher safety standards, and take advantage of sustainable technology. Raw material and formulation modifications necessary to reach low-VOC content must be carefully designed, as typical approaches often lead to trade-offs in properties such as block, corrosion, and dirt pickup resistance (DPUR). Today, waterborne acrylic DTM coatings at 50 g/L VOC with a good balance of properties are available, but a demand for even lower VOC content exists. This article describes a new acrylic resin for formulating DTM coatings at a VOC level further reduced to less than 25 g/L, while also demonstrating the highest standards of exterior durability and corrosion resistance. A comparison to currently available low-VOC resins and DTM coatings will be described to highlight the advantages of the new binder. Note de contenu : - Table 1 : Gloss white formulation DTM-1 - Table 2 : Comparison of different coalescent packages for LTFF with binder AC-1 - Table 3 : Comparison of experimental and commercial DTM coatings for LTFF - Table 4 : Testing results for gloss, hardness, DPUR, and oil softening - Table 5 : Results of dry and wet crosshatch tape adhesion, rated accordint to ASTM D3359 - Table 6 : Results for humidity resistance testing in a Cleveland condensation cabinet with rating for blistering after and 500 h of exposure on both smooth CRS and BHRS substrates - Fig. 1 : Film formation mechanism for a pigmented coating based on a conventional acrylic latex - Fig. 2 : Film formation mechanism for a pigmented coating based on latex-pigment composite technology such as in AC-1 - Fig. 3 : 60° gloss retention of experimental and commercial DTM coatings on QUV-A exposure - Fig. 4 : Block resistance ratings of DTM coatings - Fig. 5 : Picture of panels after 1000 h salt spray corrosion resistance according to ASTM B117. Coatings were applied to BHRS panels. Note that the pictures for COM-2 and COM-3 were taken after 342 h and 500 h of exposure, respectively En ligne : https://drive.google.com/file/d/1JVtuCWcWAOxRWBKMyg2p2kkL4ps59KTO/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34489 [article]

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