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Comprehensive VOC analysis method for architectural coatings / Lucas J. Brickweg in COATINGS TECH, Vol. 4, N° 1 (01/2007)  

[article]  inCOATINGS TECH > Vol. 4, N° 1 (01/2007) . - p. 48-55 Titre : Comprehensive VOC analysis method for architectural coatings Type de document : texte imprimé Auteurs : Lucas J. Brickweg, Auteur ; Max Wills, Auteur ; Dane Jones, Auteur ; Audrey Guillermo, Auteur Année de publication : 2007 Article en page(s) : p. 48-55 Langues : Américain (ame) Index. décimale : 667.9 Revêtements et enduits Résumé : Specific regulatory volatile organic compound (VOC) limits have been set for architectural coatings to ensure that emissions from these materials will decrease and air quality will improve. As regulations have lowered limits of allowed VOCs, a significant problem with enforceability of these regulations has developed since reliable methods for the analysis of these VOCs are not available. Currently, the United States Environmental Protection Agency's (U.S. EPA) Method 24 is used to test the VOC content of coatings. It is widely accepted that Method 24 is not reliable for the analysis of low VOC waterborne coatings. Method 24 is also not suitable for determining the VOC content of solventborne coatings containing high levels of exempt compounds. In both cases, the reason for the unreliability of Method 24 results from its being an indirect method of measuring VOCs in these types of coatings. Several other methods have been developed to deal with the problems of Method 24. However, none of these methods is applicable to all types of architectural coatings and none can deal with the specific problems mentioned. In addition, Method 24 cannot determine the level of hazardous air pollutants (HAPs) in coatings. We have developed direct methods for determining the VOC content in architectural coatings based on direct injection, headspace analysis, and solid phase microextraction (SPME) using gas chromatography with both flame ionization and mass spectral detection. These methods are suitable for direct determination of VOCs for all waterborne architectural coatings, even those with very low VOC levels. The methods are also suitable for direct determination of HAPs and exempt compounds in solventborne coatings. These methods can be used with confidence to determine whether or not a given coating meets the appropriate regulatory VOC level. En ligne : https://drive.google.com/file/d/1__gHqM7Ffy7nPp0hjoeP6MvRvsc6WBbe/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3605 [article]

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Formulating coatings with silver-based antimicrobials : a systematic approach / Kurt Davidson in COATINGS TECH, Vol. 4, N° 1 (01/2007)  

[article]  inCOATINGS TECH > Vol. 4, N° 1 (01/2007) . - p. 56-62 Titre : Formulating coatings with silver-based antimicrobials : a systematic approach Type de document : texte imprimé Auteurs : Kurt Davidson, Auteur ; Brett Moyer, Auteur ; Kumar Ramanathan, Auteur ; Andrea Preuss, Auteur ; Barbara Pomper, Auteur Année de publication : 2007 Article en page(s) : p. 56-62 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antimicrobiens Argent Formulation (Génie chimique) Revêtements -- Propriétés physiques Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : Silver-based antimicrobials have increased in popularity due to their high efficacy against bacteria and low ecotoxicity. There is growing interest in using them for antimicrobial coatings. However, formulation of these products into traditional coating systems can present some unique challenges, including film discoloration, loss of gloss, poor rheology, and shelf stability. This article presents a systematic study of the incorporation of silver-based antimicrobials into starting point formulations of different industrial and decorative coatings, with a focus on optimizing dispersion, storage stability, and film clarity of the coating formulation. Antimicrobial efficacy against bacteria of common interest are also presented for the optimized coating formulations. Note de contenu : - Desirable antimicrobial properties - Market and market trends - Silver-based antimicrobials - Formulating considerations - Mechanism of action - Bioefficacy testing protocol - Effect of silver-based antimicrobial on physical properties of coatings - Bioefficacy test results - Correlation of Tg and water repellency efficiency with bioefficacy - Table 1 : Tg and WRE values vs. antimicrobial concentration required for bioefficacy - Table 2 : Starting point formulations evaluated with SAM1 En ligne : https://drive.google.com/file/d/15PdRS2Au6FCpkfaMzCf0qsr03zcjR_c7/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3606 [article]

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