Fabrication of a nonionic self-emulsifiable waterborne epoxy curing agent with high cure properties / Xiaofeng Huang 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. 549-558 Titre : Fabrication of a nonionic self-emulsifiable waterborne epoxy curing agent with high cure properties Type de document : texte imprimé Auteurs : Xiaofeng Huang, Auteur ; Lei Wang, Auteur ; Yingbiao Lai, Auteur ; Laizhou Li, Auteur ; Xiang Jiang, Auteur Année de publication : 2021 Article en page(s) : p. 549-558 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosifs Anticorrosion Caractérisation Composés organiques -- Synthèse Mesure Revêtements -- Propriétés mécaniques Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : Waterborne epoxy curing agent plays a key part in the waterborne epoxy resin coatings, directly affecting the physical and chemical properties of the coating film. Here, we present triethylene tetramine (TETA), polypropylene glycol diglycidyl ether (PPGDGE), epoxy resin E20 and phenyl glycidyl ether (PGE) as reactants to fabricate a novel nonionic self-emulsifiable waterborne epoxy curing agent for oily epoxy resin through three steps of chain extension reaction, addition reaction, and capping reaction. The curing agent achieved excellent emulsifying and curing properties under the condition that TETA reacted with PPGDGE at 65°C for 4 h with the molar ratio of 2.2:1, 40% primary amine was added with E20 at 65°C for 3 h and 125% residual primary amine was capped with PGE at 65°C for 3 h. The as-prepared waterborne epoxy curing agent was characterized by Fourier transform-infrared spectroscopy and surface tension. The cured film of emulsified oily epoxy resin (E51) prepared by the as-prepared curing agent indirectly was characterized by scanning electron microscopy, thermogravimetric analysis and differential scanning calorimetry tests. The 2K waterborne epoxy coating film prepared by the as-prepared nonionic self-emulsifiable curing agent and E51 displayed better thermal property, surface appearance, flexibility, impact resistance, adhesion, and chemical corrosion resistance. Note de contenu : - MATERIALS AND METHODS : Materials - Synthesis of self-emulsifiable epoxy curing agent - Emulsifying of oily epoxy resin - Measurement and characterization - RESULTS AND DISCUSSION : Fabrication of self-emulsifiable waterborne epoxy curing agent - Properties of 2K waterborne epoxy coating film - Scheme 1 : The three steps of chemical reaction for synthesis of the self-emulsifiable epoxy curing agent - Table 1 : Influence of the molar ratio of TETA to PPGDGE on emulsifying and curing properties - Table 2 : Influence of the molar ratio of E20 to the adduct on emulsifying and curing properties - Table 3 : Influence of the molar ratio of PGE to the residual –NH2 group on emulsifying and curing properties - Table 4 : Performance parameter of waterborne epoxy curing agent - Table 5 : Comparison of mechanical properties and corrosion resistance between different epoxy resin films DOI : https://doi.org/10.1007/s11998-020-00423-3 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00423-3.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35614 [article]

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A novel hydroxyl polyacrylate latex modified by OvPOSS and its application in two-component waterborne polyurethane coatings / Wu Zeng in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 17, N° 1 (01/2020)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 17, N° 1 (01/2020) . - p. 181-191 Titre : A novel hydroxyl polyacrylate latex modified by OvPOSS and its application in two-component waterborne polyurethane coatings Type de document : texte imprimé Auteurs : Wu Zeng, Auteur ; Haowei Huang, Auteur ; Liujun Song, Auteur ; Xiang Jiang, Auteur ; Xinya Zhang, Auteur Année de publication : 2020 Article en page(s) : p. 181-191 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Composés organiques -- Synthèse Copolymérisation Essai de dureté Essai Wolff-Wilborn Polyacrylates Polymères à terminaison hydroxyle Polyuréthanes Revêtements -- Propriétés thermiques Revêtements bi-composant Revêtements organiques Silsesquioxanes oligomères polyhèdres Index. décimale : 667.9 Revêtements et enduits Résumé : Octavinyl polyhedral oligomeric silsesquioxane (OvPOSS) was synthesized via hydrolysis and condensation of vinyltriethoxysilane. The structure of OvPOSS was determined by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), 1H nuclear magnetic resonance and 29Si nuclear magnetic resonance. A novel hydroxyl functional polyacrylate latex (HPA) with core–shell structure modified by OvPOSS (OvPOSS/HPA) was successfully prepared via emulsion copolymerization. Consequently two-component waterborne polyurethane (2K-WPU) coatings were prepared by using the as-prepared latex as hydroxyl components and hydrophilic polyisocyanates as curing agents. The structure and properties of OvPOSS/HPA were marked by FTIR, XRD, differential scanning calorimetry and thermogravimetric analysis. The results of FTIR and XRD show that OvPOSS has been successfully embedded into HPA, and OvPOSS occupies a homogeneous distribution in the HPA matrix. The effect of OvPOSS on the properties of OvPOSS/HPA as well as the application performance of 2K-WPU coatings film were also investigated. The results show that OvPOSS/HPA possesses core–shell structure with the OvPOSS core and enhanced thermal stability. The glass transition temperature (Tg) of OvPOSS/HPA with 2.0% OvPOSS content is 22.3°C, which is 8.4°C higher than that of pure HPA. The performance properties of the 2K-WPU coating films such as pencil hardness were also improved by incorporation of OvPOSS. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of octavinyl-POSS (Ov POSS) - Synthesis of OvPOSS/HPA - Preparation of 2K-WPU coatings - Characterizations and instruments - RESULTS AND DISCUSSION : Structure characterization of OvPOSS - Structure characterization of OvPOSS/HPA - Particle size distribution of OvPOSS/HPA - Thermal properties of OvPOSS/HPA films DOI : 10.1007/s11998-019-00256-9 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-019-00256-9.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33737 [article]

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