Urethane methacrylate reactive diluents for UV-curable polyester powder coatings / Theodore J. Hammer in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 2 (03/2021)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 2 (03/2021) . - p. 333-348 Titre : Urethane methacrylate reactive diluents for UV-curable polyester powder coatings Type de document : texte imprimé Auteurs : Theodore J. Hammer, Auteur ; Hamideh M. Shokouhi Mehr, Auteur ; Coleen Pugh, Auteur ; Mark D. Soucek, Auteur Année de publication : 2021 Article en page(s) : p. 333-348 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse mécanique dynamique Caractérisation Composés organiques -- Synthèse Diluants Formulation (Génie chimique) Méthacrylate d'uréthane Polyesters Revêtements organiques Revêtements poudre Stabilité au stockage Viscosité Index. décimale : 667.9 Revêtements et enduits Résumé : Three urethane methacrylates, one monofunctional derivative and two di-functional derivatives with different chain lengths were used as reactive diluents in UV-curable polyester powder coatings. Each reactive diluent was formulated with a methacrylated polyester oligomer using conventional melt extrusion techniques. The effect of these compounds on zero-shear melt viscosity was investigated. Incorporation of 10 wt% reactive diluent effectively reduced the viscosity by an order of magnitude. After UV-curing, the viscoelastic, thermal, and mechanical properties of the films were characterized using dynamic mechanical analysis, differential scanning calorimetry, thermogravimetric analysis, and tensile tests. The type and concentration of reactive diluent that was used directly influenced the glass transition temperature, modulus, % elongation-at-break, and crosslink density. Of the two di-functional reactive diluents that were used, the derivative that contained a shorter methylene spacer group resulted in more heterogeneous crosslinked networks. Note de contenu : - EXPERIMENTAL : Materials - Techniques and instrumentation - Synthesis of hydroxyl-terminated polyester - Synthesis of methacrylated polyester (MPE) - Synthesis of bis(2-hydroxyethyl)hexane-1,6-diyldicarbamate (1A) - Synthesis of 4,13-dioxo-3,14-dioxa-5,12-diaza hexadecane-1,16-diyl bis(2-methylacrylate) (HDA-EC) (1B) - Synthesis of bis(2-hydroxyethyl) ethane-1,2-diyldicarbamate (2A) - Synthesis of 4,9-dioxo-3,10-dioxa-5,8-diazadodecane-1,12-diyl bis(2-methacrylate) (2B) - Synthesis of 2-hydroxyethyl dodecylcarbamate (3A) - Synthesis of 2-((dodecylcarbamoyl)oxy)ethyl methacrylate (DDA-EC) (3B) - Acid number calculations - Powder coating formulation and application - Thin-film preparation for DMA and tensile testing - RESULTS : Synthesis of MPE resin - Synthesis of urethane methacrylates - Viscosity - Thermal properties - Mechanical and viscoelastic properties - Gel content - Wide-angle X-ray scattering - General coatings tests - Table 1 : Example formulation of 5_EDA-EC - Table 2 : Summary of the DSC and TGA data obtained from the various UV-cured samples - Table 3 : Summary of the viscoelastic data obtained from DMA experiments - Table 4 : Summary of the general coatings tests and storage stability analysis DOI : https://doi.org/10.1007/s11998-020-00391-8 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00391-8.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35598 [article]

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