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[article]
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 organiquesIndex. 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 2En ligne : https://drive.google.com/file/d/1B0ac2Mg2sNEOI-g5PpL-_xwhr9AZg14W/view?usp=share [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34305
in COATINGS TECH > Vol. 17, N° 5 (05/2020) . - p. 40-45[article]Réservation
Réserver ce documentNew 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]
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
ViscositéIndex. 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 developmentEn ligne : https://drive.google.com/file/d/1B8oTIBqIc-UrC7oF5lcqi05YnQlOsSjU/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=25803
in POLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 206, N° 4618 (03/2016) . - p. 30-32[article]Réservation
Réserver ce documentVersatile chemistry for improved heurs / Pol Storme in EUROPEAN COATINGS JOURNAL (ECJ), N° 10 (10/2015)
[article]
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
ViscositéIndex. 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 productsEn ligne : https://drive.google.com/file/d/1GBHd0FAC_e-ouLZgdkO-FBbwweu9HJZM/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24705
in EUROPEAN COATINGS JOURNAL (ECJ) > N° 10 (10/2015) . - p. 38-45[article]Réservation
Réserver ce document