Challenging preservation options / Jessica Levin in COATINGS TECH, Vol. 17, N° 5 (05/2020)  

[article]  inCOATINGS TECH > Vol. 17, N° 5 (05/2020) . - p. 40-45 Titre : Challenging preservation options : Towards biocide-free waterborne coatings via innovative binders and additives Type de document : texte imprimé Auteurs : Jessica Levin, Auteur ; Wenqin Wang, Auteur ; Stan Brownwell, Auteur ; Tara Conley, Auteur ; Erica Frankel, Auteur ; John J. Rabasco, Auteur ; Deb Graves, Auteur ; Adrian Ward, Auteur Année de publication : 2020 Article en page(s) : p. 40-45 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antimicrobiens -- Suppression ou remplacement Copolymère styrène acrylique Epaississants Formulation (Génie chimique) Liants Liants en phase aqueuse Polyacryliques Polyuréthane éthoxylé modifié de façon hydrophobe Revêtements en phase aqueuse -- Additifs:Peinture en phase aqueuse -- Additifs Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : Increasing regulatory restrictions mean that there are limited preservation options currently available to the paint and coatings industry for both in-can and dry-film preservation. Experimental binders and thickeners that are more robust to microbial spoilage offer a potential solution and pass challenge testing even when formulated into waterborne paints. Water-based products are susceptible to microbial contamination. Contamination can be introduced during a variety of stages in the product life cycle, including manufacturing and packaging of the products ; "in can" during periods of storage, transportation, transfer, and usage; or on the dry film after application. Microbial susceptibility can cause product degradation, reduce product performance, or even induce hygiene and human health issues, which could result in a wide range of possible consequences, including product recall, customer complaints, reduced perception of product quality, production stoppage, etc. For these reasons, manufacturers add biocides to their waterborne products. There are three aspects of coating preservation. The first is in-can preservation, which protects all liquid-state products with preservatives. The second aspect of preserving coatings is dry-film protection, which protects coatings from microbes in application areas such as in bathrooms, kitchens, and on exterior surfaces. Lastly, plant hygiene is critical for coatings preservation. If a tank or a pipe becomes contaminated, it can contaminate the final product. Each of these three aspects requires a different approach for preservation. From the consumer’s perspective, the biocides that are present in the final product are the most important: both for in-can and dry-film preservation. Ideally, antimicrobial materials would maximize efficacy, while minimizing toxicity and environmental persistence. Active antimicrobial ingredients need to be stable within the shelf life of the product to maintain product quality, but also biodegradable when exposed to the environment to deliver eco-friendly products. Furthermore, they need to be effective against microbes but non-toxic to other life forms. Balancing these needs is difficult to achieve in reality. Note de contenu : - REGULATIONS NECESSITATE NEW PRESERVATION METHODS : Commercially available solutions are limited - Emerging technologies offer potential - DEVELOPMENT OF ROBUST RAW MATERIALS FOR STANDARD PH COATINGS : Experimental - Binders more robust against microbial spoilage - Paint formulated with experimental binders passes challenge tests - HEUR rheology modifiers that are less prone to microbial spoilage - Path to reducing spoilage without biocides - Table 1 : Rating system for estimating the level of microbial contamination on streak plates - Table 2 : Microbial challenge test results for various acrylic and styrene acrylic binders at pH 7.0-9.5 supplied without biocide - Table 3 : Paint formulation based on commercial and experimental soft styrene acrylic binders - Table 4 : Microbial challenge test result for various HEUR rheology modifiers supplied without biocide added, including the growth rating in parentheses as described in table 1 - Table 5 : Styrene acrylic screening formultion used to test type 1, type 2, and type HEURs for thickening performance - Fig. 1 : Paint performance data on paints based on commercial and experimental soft styrene acrylic binders - Fig. 2 : Microbial challenge test plates seven days after challenge 2 En ligne : https://drive.google.com/file/d/1B0ac2Mg2sNEOI-g5PpL-_xwhr9AZg14W/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34305 [article]

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