Synthesis of vanillin-based UV curable polyurethane dispersions for wood coating applications / Darshan Mahajan 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. 1773-1788 Titre : Synthesis of vanillin-based UV curable polyurethane dispersions for wood coating applications Type de document : texte imprimé Auteurs : Darshan Mahajan, Auteur ; Darbha Sai Srivats, Auteur ; Aarti More, Auteur Année de publication : 2023 Article en page(s) : p. 1773-1788 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Biopolymères Biopolymères -- Synthèse Bois -- Revêtements Caractérisation Chimie analytique Composés organiques -- Synthèse Dispersions et suspensions Enrobage (technologie) Formulation (Génie chimique) Polymères en émulsion Polyuréthanes Résistance aux taches Résistance chimique Revêtements -- Propriétés mécaniques Revêtements en phase aqueuse Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : Partial incorporation of bio-based diol in the synthesis of UV-curable polyurethane dispersion (PUDs) has been studied. The bio-based diol was synthesized from vanillin. Divanillin (DV) was used as a partial replacement for polyethylene glycol an industrial diol. PUDs were synthesized by reacting vanillin and polyethylene glycol in different percentages (10:90, 30:70, and 50:50) with isophorone diisocyanate along with 2-dimethyl propionic acid. Hydroxyethyl methacrylate is attached to incorporate unsaturation, which helps in the UV curing process, and triethyl amine is used for acid group neutralization. The synthesis of DV and resin was confirmed by FTIR spectroscopy. Divanillin synthesis confirmation was carried out by NMR spectroscopy. The synthesized resin was dispersed in water and applied on a wooden panel. Mechanical testing, like scratch resistance, pencil hardness, and cross-hatch adhesion tests, was carried out on the cured coatings to determine their properties. The 30% incorporation of DV shows the highest pencil hardness (2H) and scratch hardness (0.90 kg) among all the DV formulations and the results were comparable to plain formulation. The 30% DV also exhibits good gloss at 60° angle with value of 76.7. Coatings exhibited excellent acid resistance and moderate resistance towards alkalis. TGA was performed on the plain PU and 30% DV and the onset temperatures were 190 °C and 185 °C, respectively. All the dispersions formed were tested to determine their particle size, and the particle size distributions were in the range of 3–55 µm. Gel content percentages for all the samples were in the range of 90–97%. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of divanillin - Synthesis of polyurethane resin - Preparation of polyurethane dispersion and preparation of coating - Characterization - RESULTS AND DISCUSSION : FTIR - NMR analysis - Contact angle - Mechanical properties - Chemical prperties - Thermogravimetric analysis (TGA) - Particle size analysis of polyurethane dispersion - Gel content - Table 1 : Formulations of synthesized resin with different ratios of divanillin (DV) to PEG - Table 2 : Results of mechanical properties - Table 3 : Chemical resistance of the coating - Table 4 : Stain resistance of coating - Table 5 : Polyurethane dispersion particle diameter values after synthesis (D10, D50, and D90) - Table 6 : Polyurethane dispersion particle diameter values after 6 months (D10, D50, and D90) DOI : https://doi.org/10.1007/s11998-023-00780-9 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-023-00780-9.pdf?pdf=button% [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39987 [article]

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