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Biobased polyol with self-crosslinking functionality in COATINGS TECH, Vol. 19, N° 1 (01/2022)  

[article]  inCOATINGS TECH > Vol. 19, N° 1 (01/2022) . - p. 30-33 Titre : Biobased polyol with self-crosslinking functionality Type de document : texte imprimé Année de publication : 2022 Article en page(s) : p. 30-33 Langues : Américain (ame) Catégories : Auto-réticulation Composés organiques -- Synthèse Copolymère diacétone acrylamide Isocyanates Polymères -- Synthèse Polymères en émulsion Polyols Polyuréthanes Réactivité (chimie) Index. décimale : 667.9 Revêtements et enduits Résumé : The need for green and environmentally safe coatings creates an opportunity for biobased raw materials. Vegetable oil polyols (VOPs) are the major source of biobased raw materials for making polyurethanes. Despite their wide commercial availability, they have not been utilized for making water-based polyurethane (PU) coatings, because, VOPs have no performance-enhancing functional group in the molecular architecture. Therefore, they are unable to meet the stringent corrosion-, UV-, and solvent-resistance performance requirements. In this short communication, we present a new class of biobased polyol with a crosslinking functional group that is free from toxic chemicals and has superior performance. This is achieved by reacting a keto acid with a glycidyl functional fluids derived from biobased sources. We also present the utilization of the polyol in making water-based polyurethane dispersion (PUD). Note de contenu : - Synthesis of the polyol - Properties of the polyol - Reactivity of the polyol towards isocyanates - Application of the polyol in making self-crosslikable water-based polyurethane dispersion - Scheme 1 : Synthesis of 2,3-dihydroxypropyl levulinate (Levupol-G) - Scheme 2 : Synthesis of Levupol-S from levulinc acid and epoxidized soybean oil - Table 1 : Physical properties of Levupol-G and Levupol-S - Table 2 : Properties of PUD derived from Levupol-G - Figure : Chemical structure of diacetone acrylamide En ligne : https://drive.google.com/file/d/1fGBbUe12_u91fZXjDBS5ubrhJUckQdfH/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37169 [article]

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How to achieve faster dry times and more with high-performance catalysts in low-VOC alkyd coatings / Allison Abbey in COATINGS TECH, Vol. 19, N° 1 (01/2022)  

[article]  inCOATINGS TECH > Vol. 19, N° 1 (01/2022) . - p. 34-43 Titre : How to achieve faster dry times and more with high-performance catalysts in low-VOC alkyd coatings Type de document : texte imprimé Auteurs : Allison Abbey, Auteur ; Loulou Rozek, Auteur ; Maxwell Shumba, Auteur Année de publication : 2022 Article en page(s) : p. 34-43 Langues : Américain (ame) Catégories : Adhésion Catalyseurs Dureté (matériaux) Formulation (Génie chimique) Jaunissement (défaut) Polyalkydes Résistance à l'humidité:Résistance à l'eau Revêtement -- Séchage Revêtement en phase solvant Revêtements en phase aqueuse Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : The alkyd coating market continues to face increasing challenges as government bodies and environmental agencies establish new volatile organic content (VOC) and regulatory restrictions. In many cases, reformulation is necessary to meet ow-VOC requirements, which may cause adverse effects in the final coating, such as slow dry times, increasingly complex formulations, and poor coating performance. Formulators can overcome such performance obstacles in sustainable coatings by using the proper high-performance catalyst (HPC). This unique technology can meet VOC requirements, outperform standard metal carboxylates across multiple resin platforms, and may eliminate the need for complex drier packages. Note de contenu : - EXPERIMENTAL PRACTICES - HOW TO FORMULATE WITH HPCS : Sample preparation - Dry-time evaluations - Hardness - Yellowing - Loss of dry (LOD) - Skinning - Adhesion - Water resistance - RESULTS AND DISCUSSION : High-solids solventborne alkyd case study - Water-reducible alkyd case study - Waterborne alkyd case study En ligne : https://drive.google.com/file/d/1995MAOGS83aC3OuULSvhKoZLSqvp67uX/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37170 [article]

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Coatings Tech Vol. 19, N° 1 URL