Synthesis of poly(propylene carbonate) diol-based waterborne polyurethane modified by epoxy resin with anticorrosion properties / Yiheng Xiao in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 1 (01/2024)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 1 (01/2024) . - p. 319-328 Titre : Synthesis of poly(propylene carbonate) diol-based waterborne polyurethane modified by epoxy resin with anticorrosion properties Type de document : texte imprimé Auteurs : Yiheng Xiao, Auteur ; Wei Ou, Auteur ; Zonglin He, Auteur ; Zhu Ding, Auteur ; Jiaoyan Ai, Auteur ; Lina Song, Auteur ; Baohua Liu, Auteur Année de publication : 2024 Article en page(s) : p. 319-328 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésion Anticorrosifs Anticorrosion Caractérisation Epoxydes Essai Wolff-Wilborn Polymères -- Synthèse Polymères en émulsion Polyuréthanes Revêtements en phase aqueuse Revêtements organiques Revêtements protecteurs Index. décimale : 667.9 Revêtements et enduits Résumé : A series of modified waterborne polyurethane (WPU) with various epoxy contents was synthesized from poly (propylene carbonate) diol (PPCD)-based polyurethane prepolymer and ring-opening epoxy resin (RO-EP). The particle size, storage stability, and freeze-thaw resistance of the emulsions were examined. The pencil hardness and adhesion level of the films were tested. The structure of the modified waterborne polyurethane was characterized by Fourier transform infrared spectroscopy. The thermal stability of the modified waterborne polyurethane was studied by thermogravimetric analysis. The corrosion resistance of emulsion coating was tested by the salt spray test and electrochemical impedance spectroscopy (EIS). The waterborne polyurethane emulsion modified by RO-EP had excellent storage stability. When the content of the ring-opening epoxy resin was 10 wt%, the particle size of WPU was the smallest. The corresponding coating had excellent hardness and adhesion level. The salt spray and EIS test showed that the WPU coating with 10% RO-EP had superior corrosion resistance. Note de contenu : - EXPERIMENTAL : Materials - Preparation of RO-EP - Preparation of E-WPU - Preparation of E-WPU films - Characterization - RESULTS AND DISCUSSION : Fourier transform infrared spectroscopy (FTIR) analysis - TGA analysis - Particle size analysis - Adhesion and hardness test analysis - Salt spray test - EIS measurement - Table 1 : Reactant proportions of WPU and E-WPU - Table 2 : TGA data of WPU and E-WPU films with various RO-EP contents - Table 3 : Properties of WPU and E-WPU emulsions - Table 4 : Adhesion level and pencil hardness of WPU and E-WPU films - Table 5 : Impedance modulus of coatings at different time DOI : https://doi.org/10.1007/s11998-023-00823-1 En ligne : https://drive.google.com/file/d/14Xy6b0xZPvCh7CAHet2LxIJwwjmj0GlQ/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40450 [article]

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Two-component UV-curable waterborne CO2-based polyurethane dispersion with outstanding flexibility / Zhu Ding in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 5 (09/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 5 (09/2023) . - p. 1569-1578 Titre : Two-component UV-curable waterborne CO2-based polyurethane dispersion with outstanding flexibility Type de document : texte imprimé Auteurs : Zhu Ding, Auteur ; Jiahui Chen, Auteur ; Zonglin He, Auteur ; Chaozhi Wang, Auteur ; Hualin Li, Auteur ; Zhenhong Huang, Auteur ; Baohua Liu, Auteur ; Lina Song, Auteur Année de publication : 2023 Article en page(s) : p. 1569-1578 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acidité Caractérisation Diols Dioxyde de carbone Polycarbonate de propylène Le carbonate de polypropylène (PPC), un copolymère d'anhydride carbonique et d'oxyde de propylène, est un thermoplastique. Des catalyseurs tels que le glutarate de zinc sont utilisés dans sa polymérisation. Polyuréthanes Résistance chimique Revêtements -- Propriétés mécaniques Revêtements -- Propriétés thermiques Revêtements bi-composant Revêtements en phase aqueuse -- Séchage sous rayonnement ultraviolet Souplesse (mécanique) Thermogravimétrie Index. décimale : 667.9 Revêtements et enduits Résumé : A series of two-component UV-curable waterborne CO2-based polyurethane dispersions (UV-PUDs) with excellent flexibility and mechanical strength were synthesized from poly(propylene carbonate) diol (PPCD), isophorone diisocyanate (IPDI), 2,2-bis(hydroxymethyl) propionic acid (DMPA), 2-hydroxyethyl acrylate (HEA), pentaerythritol triacrylate (PETA) and 1,4-butanediol (BDO). One component was UV-curable waterborne polyurethane terminated by HEA and PETA (molar ratio 1:1), and the other component was linear waterborne polyurethane. The content of the UV-curable component in UV-PUD was 15%, 30%, 45%, 60%, and 100% (weight content). The obtained cured films exhibited superior flexibility without loss of tensile strength, accompanied by excellent acid and alkali resistance. In particular, the dried UV-PUD films without curing showed good mechanical properties. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of UV-PUD - Preparation of UV-PUD film - Characterization - RESULTS AND DISCUSSION : FTIR analysis - Effect of photoinitiator dosage on unsaturation conversion - Performances of UV-PUDs - Unsaturation conversions of UV-PUDs - Performances of UV-PUD cured films - Thermal properties - Table 1 : Reactant proportion of UV-PUDs - Table 2 : Performances of UV-PUDs - Table 3 : Properties of UV-PUD cured films - Table 4 : Absorption rates of UV-PUD cured films to various solvents - Table 5 : Mechanical properties and chemicals resistance of UV-PUDs films - Table 6 : TGA data of UV-PUD cured films DOI : https://doi.org/10.1007/s11998-023-00763-w En ligne : https://link.springer.com/content/pdf/10.1007/s11998-023-00763-w.pdf?pdf=button% [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39972 [article]

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