Non-isocyanate coatings with fast return to service and excellent appearance for industrial flooring application / Ulises Brauer in COATINGS TECH, Vol. 18, N° 7 (07/2021)  

[article]  inCOATINGS TECH > Vol. 18, N° 7 (07/2021) . - p. 42-52 Titre : Non-isocyanate coatings with fast return to service and excellent appearance for industrial flooring application Type de document : texte imprimé Auteurs : Ulises Brauer, Auteur ; Phillip Tomes, Auteur ; Gautam Haldankar, Auteur Année de publication : 2021 Article en page(s) : p. 42-52 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Durée de vie en pot Essais accélérés (technologie) Formulation (Génie chimique) Michael, Addition de L'addition de Michael ou réaction de Michael est une réaction qui permet la création de liaisons carbone-carbone, voire de liaisons carbone-soufre. Il s'agit de l'addition nucléophile d'un carbanion sur un composé carbonylé α,β insaturé (aldéhyde, cétone et même ester α,β insaturé, des nitriles et des amides α,β insaturés pouvant aussi être utilisés). Elle appartient à la famille des additions nucléophiles conjuguées. Cette réaction doit son nom au chimiste américain Arthur Michael. Résistance chimique Revêtements de sols industriels Revêtements organiques Revêtements sans isocyanates Rhéologie Index. décimale : 667.9 Revêtements et enduits Résumé : A new application of Michael Addition (MA) chemistry was recently explored and developed for use in industrial flooring. Historically, MA was not applied in protective coatings due to the extremely fast reactivity which resulted in poor appearance and unacceptably short pot life. Now, the development of a blocked catalyst and incorporation of kinetic additives have allowed formulators to tame and control the speed of the MA reaction. This novel technology exhibits excellent chemical properties compared to traditional systems, providing the best balance between working time, appearance, and fast return to service. This MA technology is comprised of a wide variety of donor and acceptor resins, giving the formulator the ability to tailor coatings to meet specific performance goals. Polyaspartic (PA) technology is used when fast cure and hardness development is required in flooring systems. However, this contractor-applied system requires highly skilled labor due to its very short pot life and sensitivity to adverse application conditions such as high environmental moisture and temperature. In this study, different combinations of resins and kinetic additives were explored to match properties of a commercial polyaspartic for industrial flooring. The MA-based system produced coatings that displayed outstanding chemical and physical properties, exterior durability, longer working times, excellent appearance, low volatile organic compounds (VOCs), and fast return to service. Another added value of this technology over traditional systems is the offering of a non-isocyanate (NISO) solution to customers who are looking to comply with increasing regulatory restrictions. This study also presents the rheology study of various formulations and demonstrates that lapping time and flow-leveling of MA coatings can be modified to meet industrial market needs. Note de contenu : - EXPERIMENTAL : Selection of resins - Application and conditioning of panels - Instruments - Chemical resistance - Application by Roller - Accelerated weathering - RESULTS AND DISCUSSION : Formulation of a fast return-to-service coating - Coating chracteristics of ultra-fast cure formula - Adjusting MA formulations to extend working time - Pot life - Tie-in time (lapping) - Hardness development and return-to-service relationship - Chemical resistance - Accelerated weathering - Fig. 1 : Michael addition chemistry applied in polymers - Fig. 2 : Appearance of floor coatings roller-applied after 50 minutes of activation - Table 1 : Preferred MA resins for flooring application - Table 2 : Formulation of clear MA UFC - Table 3 : Coating properties of clear MA UFC - Table 4 : Performance characteristics of clear MA UFC - Table 5 : Formulation of clear MA FC - Table 6 : Coating properties of clear MA FC - Table 7 : Performance characteristics of clear MA FC - Table 8 : Chemical spot test results for MA FC and PA En ligne : https://drive.google.com/file/d/1K7S6ak7DVAvThtIgJ8NdjkeNkWgUespT/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36045 [article]

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