Biocides resolves bacterial hygiene / Mary C. Chervenak in EUROPEAN COATINGS JOURNAL (ECJ), N° 1-2/2004 (01-02/2004)  

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 1-2/2004 (01-02/2004) . - p. 26-34 Titre : Biocides resolves bacterial hygiene Type de document : texte imprimé Auteurs : Mary C. Chervenak, Auteur ; Alan Eachus, Auteur ; Blaise Henry, Auteur Année de publication : 2004 Article en page(s) : p. 26-34 Langues : Anglais (eng) Catégories : Antimicrobiens Revêtements -- Additifs:Peinture -- Additifs Index. décimale : 667.9 Revêtements et enduits Résumé : Proper bacterial hygiene is a concern at all stages of the coatings manufacturing process. It is vital to facilitating efficient production, achieving cost-containment goals and ensuring finished product quality. Concern over bacterial hygiene begins with raw material delivery and continues through final production. It remains a prevalent goal even during final storage, regardless of how well proper hygiene protocol was implemented during the manufacturing process. DBPNA (2,2-dibromo-3-nitrilopropionamide) a novel biocide can assist the prevalent goal. Note de contenu : - Keeping reputation - 99,9 % microbial kill rate - Antimicrobial activity in different systems - 300 ppm DBNPA are effective - Wash water : a minimum concentration of 250 ppm is required - DBNPA as a preservative enhancer - Combination with popular in-can preservatives is possible En ligne : https://drive.google.com/file/d/1jqmP1gYxwvJo-aqltWclhkYsq1OKaEpv/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24203 [article]

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Improved performance in a waterborne all-acrylic latex produced without PFAS / Mary C. Chervenak in COATINGS TECH, Vol. 21, N° 2 (03-04/2024)  

[article]  inCOATINGS TECH > Vol. 21, N° 2 (03-04/2024) . - p. 43-51 Titre : Improved performance in a waterborne all-acrylic latex produced without PFAS Type de document : texte imprimé Auteurs : Mary C. Chervenak, Auteur Année de publication : 2024 Article en page(s) : p. 43-51 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Formulation (Génie chimique) Latex Polyacryliques Revêtements en phase aqueuse -- Additifs:Peinture en phase aqueuse -- Additifs Revêtements en phase aqueuse:Peinture en phase aqueuse Substances per- et polyfluoroalkylées -- Suppression ou remplacement Index. décimale : 667.9 Revêtements et enduits Résumé : As demonstrated by two different test methods, an acrylic produced without PFAS can meet the surfactant leach resistance of a PFAS-containing acrylic developed specifically for this purpose. With one exception, other performance properties for the acrylic produced without PFAS, such as hiding power, gloss development, and dirt pick-up resistance, remained at least equivalent to those of older acrylic technologies. Although block resistance, a paint-performance property attributed to PFAS, was not as pronounced in the new acrylic produced without PFAS, performance was not completely absent. Paint performance may therefore be preserved through creative polymer design, and further modulated through formulation techniques and the incorporation of additives, effectively demonstrating that a more environmentally sound acrylic can be a viable alternative to conventional all-acrylic latexes. Note de contenu : - Experimental procedures - Dirt pick-up resistance evaluation - Surfactant leach resistance evaluation ("water droplet" method) - Surfactant leach resitance evaluation ("water extraction" method) - Performance in exterior semigloss white base - Table 1 : Exterior matte deep base paint formula utilized for surfactant leach resistance studies - Table 2 : Exterior semigloss paint formula utilized for other paint performance studies - Table 3 : Acrylic latexes evaluated in exterior matte and semigloss paint studies En ligne : https://drive.google.com/file/d/1rZE9MJlMG_Amo-m2wpQhwG1-KWdwhaqA/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40649 [article]

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Nontraditional use of the biocide DBNPA in coatings manufacture / Mary C. Chervenak in COATINGS TECH, Vol. 2, N° 13 (02/2005)  

[article]  inCOATINGS TECH > Vol. 2, N° 13 (02/2005) . - p. 38-42 Titre : Nontraditional use of the biocide DBNPA in coatings manufacture Type de document : texte imprimé Auteurs : Mary C. Chervenak, Auteur ; Gerald B. Konst, Auteur ; William R. Schwingel, Auteur Année de publication : 2005 Article en page(s) : p. 38-42 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 667.9 Revêtements et enduits Résumé : DBNPA is a powerful biocide with two unique properties: it kills micro-organisms immediately upon addition and it degrades rapidly. Although DBNPA is compatible with many chemical classes, including oxidizing agents, it will react readily with nucleophilic agents and sulfur-containing reducing agents. The facile reaction of DBNPA with sulfur-containing nucleophiles common to microorganisms, such as glutathione or cysteine, is the basis of its mode of antimicrobial action. DBNPA is therefore not a typical oxidizing or halogen-releasing biocide. Unlike other thiol-reactive biocides, its action is such that thiol-based amino acids, like cysteine, are oxidized beyond the formation of disulfide species.5 This reaction irreversibly disrupts the function of cell-surface components, interrupting transport across cell membranes, and inhibiting key biological functions. DBNPA degrades rapidly by both nucleophilic and hydrolytic pathways to relatively nontoxic products. The rate of hydrolysis of DBNPA is strongly pH-dependent: at pH 6.0 and 25°C, the DBNPA molecule has a half-life of 155 hours (about 6.5 days), but at pH 8.0 and 25°C, its half-life is about two hours. The ultimate degradation products of DBNPA are ammonia, carbon dioxide, and bromide ion. DBNPA, when formulated as a 20% solution in water and polyethylene glycol, is completely miscible with water and readily disperses upon introduction into a water-based system. The DBNPA molecule begins functioning as an antimicrobial agent immediately upon introduction into a system; the rate of this activity is not affected by pH and antimicrobial control is usually achieved before complete degradation occurs. The combination of instantaneous antimicrobial activity and rapid chemical breakdown makes DBNPA a cost-effective biocide that swiftly degrades in the environment. En ligne : https://drive.google.com/file/d/11cGJnrmo88Yjj2QvV_Tnq9jlsAhQkqoY/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5529 [article]

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