Comparing the properties of isocyanate and non-isocyanate curing coatings / Dmitrii Smirnov in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 209, N° 4652 (06/2019)  

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 209, N° 4652 (06/2019) . - p. 23-27 Titre : Comparing the properties of isocyanate and non-isocyanate curing coatings Type de document : texte imprimé Auteurs : Dmitrii Smirnov, Auteur ; Irina Grianko, Auteur ; Larisa Sakharova, Auteur ; Dmitrii Vasilev, Auteur ; Aleksandr Llin, Auteur Année de publication : 2019 Article en page(s) : p. 23-27 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Adhésion Durée de vie en pot Formulation (Génie chimique) Perméabilité Polyuréthanes Réactions chimiques Résistance à l'abrasion Résistance au rayonnement ultraviolet Résistance chimique Réticulation (polymérisation) Revêtement en phase solvant Revêtements -- Teneur en composés organiques volatils Revêtements bi-composant Revêtements organiques Revêtements sans isocyanates Rhéologie Index. décimale : 667.9 Revêtements et enduits Résumé : The number of studies on reduction of volatile organic compounds (VOC) content', as well as minimisation or complete elimination of isocyanates in the solventborne 2K PUR coatings has significantly increased over the lest few decades. The growing demand for coating systems with a limited volatile organic compounds (VOC) content and desire to eliminate toxic isocyanates as curing agents in 2K polyurethane coatings are driving the development and research of alternative («non-isocyanate» NISO-) curing technologies. It is important that physical, mechanical, protective and decorative properties of the new coatings are comparable to those of conventional solventborne 2K polyurethane systems. The non-isocyanate curing coatings must, as far as possible, compensate the drawbacks and limitations of conventional solventborne 2K systems. The objective was to carry out a comparison study of the properties and performance of conventional solventborne 2K PUR medium and high solid coatings and systems based on different non-isocyanate curing technologies presently available in the coating raw materials market. Note de contenu : - MATERIALS : Isocyanate-based systems (Formluations 1 and 2) - Non-isocyante curing systems (Formulations 3-6) - METHODS - RESULTS AND DISCUSSION : Physical properties of the liquid coatings - Rheological measurements within the pot life - Curing process, film hardness, Taber abrasion resistance, chemical resistance and permeability - Film adhesion - QUV-B resistance - Fig. 1 : Curing by Michael addition - Fig. 2 : Polyurethane formation as a result of polycarbamate and polyaldehyde reaction - Fig. 3 : Reaction between carboxyl and epoxy group - Fig. 4 : Typical film drying stages - Fig. 5 : VOC content in the coatings - Fig. 6 : Complex viscosity vs pot life at 20°C - Fig. 7 : Time distribution of various film curing process stages at 23 ± 2°C - Fig. 8 : Film curing to mechanical resistance at 60°C - Fig. 9 : Film hardness after 1 and 7 days of curing at 20°C - Fig. 10 : Film Tg values after 7 days of curing at 20°C (1st and 2nd run) - Fig. 11 : Mass loss values after 500 abrasion cycles - Fig. 12 : Electrochemical impedance vs current frequency - Fig. 13 : Colour difference (ΔE) after 500hr exposure to QUV-B(313nm) - Table 1 : Physical properties of the studied systems - Table 2 : Hydroxy-functional acrylic copolymer properties - Table 3 : Film adhesion En ligne : https://drive.google.com/file/d/1g5IgjWIKcCWjL5ve8i-IQP0k6zgzmbSj/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32706 [article]

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