Synthesis of a curing agent containing trifunctional epoxy groups for powder coatings and its curing reaction kinetics / Qiuping Su in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 3 (05/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 3 (05/2022) . - p. 907-917 Titre : Synthesis of a curing agent containing trifunctional epoxy groups for powder coatings and its curing reaction kinetics Type de document : texte imprimé Auteurs : Qiuping Su, Auteur ; Zilun Tang, Auteur ; Jiajian He, Auteur ; Yuxin Gu, Auteur ; Yong Li, Auteur ; Jing Xie, Auteur ; Shaoshun Wang, Auteur ; Ruijun Lin, Auteur ; Xiaofeng Lin, Auteur ; Wenjing Lin, Auteur ; Guobin Yi, Auteur Année de publication : 2022 Article en page(s) : p. 907-917 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Cinétique chimique Composés organiques -- Synthèse Morphologie (matériaux) Polyesters Polymérisation Réticulants Revêtements organiques Revêtements poudre Stabilité thermique Index. décimale : 667.9 Revêtements et enduits Résumé : In this work, tris(oxiran-2-ylmethyl) benzene-1,3,5-tricarboxylate (TOTC) was synthesized by a new two-step method without using harmful epichlorohydrin and served as a curing agent for polyester powder coatings. The chemical structure of TOTC was determined by Fourier transform infrared spectroscopy and nuclear magnetic resonance spectroscopy. The curing behavior and the curing reaction kinetics of TOTC/polyester resin (NH-3307) system were studied by dynamic differential scanning calorimetry. The activation energy Ea was 71.75 kJ mol-1 according to Flynn–Wall–Ozawa method, and the curing reaction of TOTC/NH-3307 system was described by Friedman method. It was found that the curing reaction of TOTC/NH-3307 system was a two-parameter autocatalysis which followed the Å estάk–Berggren model. The nonisothermal curing reaction rate was simulated according to the Å estάk–Berggren model and the experimentally parameters. What is more, the thermogravimetric analysis results showed that the TOTC/NH-3307 system had good thermal stability with an initial decomposition temperature of 374.92°C. The TOTC/NH-3307 cured film exhibited excellent leveling performance by SEM. The results demonstrated that TOTC has efficient curing ability and huge market potential. Note de contenu : - Experimental : Materials - Methods : Synthesis of triallyl benzene-1,3,5-tricarboxylate (TATC) - Synthesis of tris(oxiran-2-ylmethyl) benzene-1,3,5-tricarboxylate (TOTC) - Preparation of powder coatings - Characterization and instrumentation - Results and discussion : Synthesis and characterization of TOTC - Curing kinetics and mechanism analysis : Nonisothermal DSC cure - Curing kinetics - Curing mechanism - Thermal stability analysis - Surface morphology analysis - Table 1 : Characteristic parameters of TOTC/NH-3307 powder coating system - Table 2 : Characteristic peak conversion values and calculated kinetic parameters for autocatalytic model at different heating rates DOI : https://doi.org/10.1007/s11998-021-00578-7 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00578-7.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38085 [article]

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Code-barres	Cote	Support	Localisation	Section	Disponibilité
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