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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Effects of latex and thickener polarities on rheology and phase stability of latex-HEUR mixtures / Travis B. Smith in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 4 (07/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 4 (07/2023) . - p. 1311-1324 Titre : Effects of latex and thickener polarities on rheology and phase stability of latex-HEUR mixtures Type de document : texte imprimé Auteurs : Travis B. Smith, Auteur ; David Chisholm, Auteur ; Abby Cheng, Auteur ; Juan Ortiz Salazar, Auteur ; Lia Roccucci, Auteur ; Bailey Morales, Auteur ; Gary Dombrowski, Auteur ; John J. Rabasco, Auteur ; Patrick Hartnett, Auteur ; Ray Fernando, Auteur Année de publication : 2023 Article en page(s) : p. 1311-1324 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cisaillement (mécanique) Epaississants Epaississement Floculation Latex Polyuréthane éthoxylé modifié de façon hydrophobe Revêtements en phase aqueuse:Peinture en phase aqueuse Rhéologie Synérèse En chimie, la synérèse définit la séparation d'un liquide de son gel. Index. décimale : 667.9 Revêtements et enduits Résumé : In this study, hydrophobically modified, ethoxylate urethanes (HEURs) and latexes of well-defined structure and composition were used to examine the rheology and phase behavior of HEUR–latex mixtures. The mixtures comprised one of four HEURs that were synthesized with varying molecular weight polyethylene glycols (PEG 35 K, 20 K, 12 K, and 8 K) and end-capped with octadecyl hydrophobes, as well as one of two latexes (butyl acrylate/styrene [BA-Sty] and butyl acrylate/methyl methacrylate [BA-MMA]) that each contained a small amount of methacrylic acid. The two experimental latexes represent compositions commonly used in commercial paint formulations. The polarity of the HEURs decreases as the PEG molecular weight decreases and the surface of the styrene containing latex is less polar than that containing methyl methacrylate. In all HEUR–latex mixtures, the latex polymer volume fraction was maintained constant at 0.25 which provides a dispersed component spatial crowdedness that represents a fully formulated paint. All latex–HEUR mixtures were stable at very low (i.e., below 0.10% by weight) HEUR levels. At critical concentrations dependent on the polarity of thickener and latex, flocculation was accompanied by syneresis for latex-thickener mixtures prepared with all HEURs except the one with the longest PEG spacer. Further increase of HEUR levels revealed another critical concentration above which the mixtures were stable. Effects of the latex polarity diminished for the mixtures prepared with more hydrophobic HEURs. Note de contenu : - HEUR C18-EO795 and latex mixtures - HEUR C18-EO455 and latex mixtures - Table 1 : Compositions and molecular weights (determined by GPC) of model HEURs - Table 2 : Properties of model latexes - Table 3 : Compositions of representative latex–HEUR mixtures - Table 4 : Visual assessment of stability of latex–HEUR samples after 6–8 days of equilibration - Table 5 : Number of HEUR molecules available per BA-Sty latex particle - Table 6 : Latex surface area (nm2) claimed by a HEUR hydrophobe, assuming one of the hydrophobes from every HEUR molecule is adsorbe DOI : https://doi.org/10.1007/s11998-022-00746-3 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00746-3.pdf?pdf=button% [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39718 [article]

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New generation water-based associative rheology modifiers to meet current market demands / Pol Storme in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 206, N° 4618 (03/2016)  

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 206, N° 4618 (03/2016) . - p. 30-32 Titre : New generation water-based associative rheology modifiers to meet current market demands Type de document : texte imprimé Auteurs : Pol Storme, Auteur ; Inge De Preter, Auteur ; John J. Rabasco, Auteur ; Daniel A. Saucy, Auteur ; Tara Conley, Auteur Année de publication : 2016 Article en page(s) : p. 30-32 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Epaississants Hydrophobie Polyuréthane éthoxylé modifié de façon hydrophobe Revêtements -- Additifs:Peinture -- Additifs Rhéologie Viscosité Index. décimale : 667.9 Revêtements et enduits Résumé : Hydrophobically modified ethylene oxide urethanes or 'HEUR' rheology modifiers provide rheology profiles offering excellent flow and levelling, good water resistance properties and efficient ways to increase the high shear application viscosity. An enhanced technology has been developed in HEUR chemistry to offer ways to produce concentrated HEUR rheology modifiers without the need for organic solvent or additives, like surfactants, to suppress the solution viscosity. This allows one to produce HEURs with low 'as supplied' viscosity for ease of handling in production. In addition, this technology offers materials that contribute to narrow the gap in several performance areas including increased thickening efficiency and cost in use, improved balance between levelling and sag, improve applied hide and reduced viscosity loss upon tinting. Note de contenu : - HEUR acid suppression technology - Enhanced HEUR technology offering superior viscosity resistance upon tinting and optimised SAG/levelling balance - Enhance HEUR technology offering improved applied hiding - Enhanced HEUR technology of MID-high builders with stable viscosity development En ligne : https://drive.google.com/file/d/1B8oTIBqIc-UrC7oF5lcqi05YnQlOsSjU/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=25803 [article]

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Thickening paints for any weather / John J. Rabasco in EUROPEAN COATINGS JOURNAL (ECJ), N° 6 (06/2019)  

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 6 (06/2019) . - p. 18-24 Titre : Thickening paints for any weather : Consistent rheology under varying coating application temperatures Type de document : texte imprimé Auteurs : John J. Rabasco, Auteur ; Daniel A. Saucy, Auteur ; Antony Van Dyck, Auteur ; Kebede Beshah, Auteur Année de publication : 2019 Article en page(s) : p. 18-24 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cellulose La cellulose est un glucide constitué d'une chaîne linéaire de molécules de D-Glucose (entre 200 et 14 000) et principal constituant des végétaux et en particulier de la paroi de leurs cellules. Epaississants Latex Polyuréthane éthoxylé modifié de façon hydrophobe Revêtements -- Additifs:Peinture -- Additifs Rhéologie Solutions aqueuses (chimie) Index. décimale : 667.9 Revêtements et enduits Résumé : Hydrophobically modified ethylene oxyde urethane (HEUR) rheology modifiers are used widely in water-borne architectural coatings to impart specific rheological and application properties. Note de contenu : - The state of the art - New all-weather HEUR technology - Aqueous solution viscosities of HEUR rheology modifiers - Aggregration tendency via NMR diffusion coefficients - Temperature response of paints thickened with AW-HEUR - Fig. 1 : General structure of HEUR non-ionic associative rheology modifiers - Fig. 2 : Binder latex particles with HEUR shells forming an associative network of transient aggregates and aggregate changes with shear stress and temperature - Fig. 3 : Commercial Paint #1 rheometer sweeps at 2°C, 21°C and 38°C - Fig. 4 : As-is viscosity of aqueous HEUR solutions vs temperature - Fig. 5 : Diffusion coefficients of "Acrysok RM-20206" and AW-HEUR #1 via PFG-NMR - Fig. 6 : KU & Brookfield viscosity vs temperature for paint thickened with varying amounts of cellulosic and AW-HEUR #1 - Fig. 7 : Rheometer sweep vs temperature for paints thickened with different amounts of cellulosic and AW-HEUR #1 - Fig. 8 : KU viscosity vs temperature for paints thickened with different AW-HEUR compositions - Table 1 : Paints thickened with varying ratios of AW-HEUR #1 and cellulosic - Table 2 : Paints thickened with AW-HEUR polymers of differing composition En ligne : https://drive.google.com/file/d/1QOVFEb8g5j_GrmXmN8bV3FrCqvcw5io3/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32687 [article]

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Versatile chemistry for improved heurs / Pol Storme in EUROPEAN COATINGS JOURNAL (ECJ), N° 10 (10/2015)  

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 10 (10/2015) . - p. 38-45 Titre : Versatile chemistry for improved heurs : A new generation of water-based associative rheology modifiers show performance gains Type de document : texte imprimé Auteurs : Pol Storme, Auteur ; Inge De Preter, Auteur ; John J. Rabasco, Auteur ; Daniel A. Saucy, Auteur ; Tara Conley, Auteur ; Jihui Guo, Auteur Année de publication : 2015 Article en page(s) : p. 38-45 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Epaississants Opacifiants Polyuréthane éthoxylé modifié de façon hydrophobe Revêtements en phase aqueuse -- Additifs:Peinture en phase aqueuse -- Additifs Rhéologie Viscosité Index. décimale : 667.9 Revêtements et enduits Résumé : A technology termed "Acid Supression" allows efficient HEUR rheology modifiers to be supplied at high solids content, without the use of solvents or surfactants. This also allows different polymer structures to be created, which show a range of performance benefits. Note de contenu : - The problems of heur supply viscosity - Different solutions to high supply viscosity issues - Performance benefits of the new heurs - Highly efficient mid-shear products - Improved tinting and sag/levelling balance - Hiding power improved in practical application - Stable viscosity is attained more rapidly - High shear viscosity obtained with less syneresis - Aversatile technology with tailored products En ligne : https://drive.google.com/file/d/1GBHd0FAC_e-ouLZgdkO-FBbwweu9HJZM/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24705 [article]

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Waterborne polymers for water repellent wood coatings / Charles R. Hegedus in COATINGS TECH, Vol. 3, N° 3 (03/2006)  

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