Role of cobalt drier and its replacement with next generation driers in high solid alkyd based systems / Poonam More in PAINTINDIA, Vol. LXVIII, N° 3 (03/2018)  

[article]  inPAINTINDIA > Vol. LXVIII, N° 3 (03/2018) . - p. 55-62 Titre : Role of cobalt drier and its replacement with next generation driers in high solid alkyd based systems Type de document : texte imprimé Auteurs : Poonam More, Auteur ; Yogesh B. More, Auteur Année de publication : 2018 Article en page(s) : p. 55-62 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cobalt -- Produits de remplacement Haut extrait sec Molybdène Polyalkydes Polymérisation par oxydation Réticulants Revêtements:Peinture Vanadium Le vanadium est un élément chimique, de symbole V et de numéro atomique 23. C'est un métal rare, dur et ductile que l'on trouve dans certains minerais. Il est principalement utilisé dans les alliages. Il possède une bonne résistance à la corrosion par les composés alcalins, ainsi qu'aux acides chlorhydrique et sulfurique. Il s'oxyde rapidement à environ 933 K. Le vanadium possède une bonne force structurelle ainsi qu'une faible section efficace d'interaction avec les neutrons de fission, ce qui le rend utile dans les applications nucléaires. C'est un métal qui présente à la fois des caractéristiques acide et basique. Index. décimale : 667.9 Revêtements et enduits Résumé : This article depicts an overview of chemistry and various types of driers used in auto-oxidative type of curing systems. The system is mainly comprised of high solid alkyd. Driers are metal salts which catalyse auto oxidation process. Several metal driers have been used in paint industries for decades. However, as we move towards greener technology, there is a need for replacing the traditional metal driers with more ecofriendly metal driers by technological breakthroughs. Cobalt drier is one of the essential drier of th is category and nowadays becoming area of concern for futuristic point of view. The pronounced genotoxicity and carcinogenicity of cobalt compounds stimulate the legislative pressure on the paint producing industry to replace these compounds. Understanding exact role of Cobalt drier in auto-oxidative type of system and finding perfect fit for its replacement is need of the day. Several investigations and practical approaches proposed the use of iron, strontium, molybdenum and vanadium compounds as the replacement of cobalt based drier in high solid alkyd systems. Hence, we need to start making use of these next generation driers to take it to the next level. Note de contenu : - AUTOXIDATION IN PRESENCE OF COBALT DRIER : Main reasons for reviewing cobalt drier - REPLACEMENT OF COBALT WITH NEXT GENERATION DRIERS IN ALKYD-BASED SYSTEM : Iron as an alternate for curing of high solid alkyd - Ferrocene and its derivatives - Thiolene chemistry used for drying enhancement of alkyd paints - Thiol-ene curing by visible light photoinitiator - Oxovanadium (IV) compounds - Allyl molybdenum complex [n3-C3h5(n5-C5H5)Mo(CO2] - FIGURES : 1. Schematic representation of auto-oxidative type of mechanism - Autoxidation in presence of cobalt drier - 3. Detailed and shifted FTIR spectra of HS alkyd coatings with Co drier (PCo2) vs time - 4. Detailed and shifted FTIR spectra of HS alkyd coatings with Fe drier (PFe2) vs time - 5. Time-depedent concentrations of cis-C=C-H for HS alkyd coatings with Co drier - 6. Relative reaction rate of HS alkyd coatings depending on the wt% of drier content added in resin solid - 7. NYquist plot of EIS measurements and used equivalent circuit model for HS alkyd coatings with different Co and Fe drier concentrations - 8. Product between Warburg coefficient and film thickness for cured HS alkyd coatings with different Co and Fe drier concentrations - 9. Pore resistance for cured HS alkyd coatings with different Co and Fe drier concentrations - 10. Schematic representation of the ascorbic acid and its lipophilic derivatives used in combination with iron as drier - 10. Pseudo-first-order plots for the disappearance of EL with time. Results for mixtures of the cobalt drier and ferrocene derivatives with electron releasing substituents - 11. Chemical structure of studied driers - 12. Schematic depiction of the reaction of four functional thiol resin with an alkyd resulting in a highly functional alkyd resin which can polymerize further by oxidative type of drying - 13. Chemical structure of studied drier - 14. Chemical structure of studied drier En ligne : https://drive.google.com/file/d/1VfiBCVjXtiSLlw_vIpnugpFQN7MQ3B6E/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30691 [article]

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