Preparation of high-performance epoxy soybean oil-based UV-curable oligomers and coatings / Yumei Zhou in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 6 (11/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 6 (11/2023) . - p. 1923-1933 Titre : Preparation of high-performance epoxy soybean oil-based UV-curable oligomers and coatings Type de document : texte imprimé Auteurs : Yumei Zhou, Auteur ; Linxi Feng, Auteur ; Jinqing Qu, Auteur Année de publication : 2023 Article en page(s) : p. 1923-1933 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse structurale (ingénierie) Copolymère époxy acrylique Copolymères -- Synthèse Huile de soja Oligomères Revêtements -- Propriétés mécaniques Revêtements -- Propriétés thermiques Revêtements -- Séchage sous rayonnement ultraviolet Revêtements organiques Traction (mécanique) Index. décimale : 667.9 Revêtements et enduits Résumé : Ultraviolet (UV)-curable coatings made from acrylated epoxy soybean oil (AESO) combine the advantages of renewable biobased resources and energy-efficient UV-curable materials, so they serve as the primary research objects for developing eco-friendly coatings. However, due to the lack of rigid structure, the hardness and thermal stability of AESO are much lower than those of petroleum-based epoxy acrylate (EA). Therefore, high-performance soybean oil-based UV-curable oligomers were prepared by using dimethylolpropionic acid (DMPA) and methacrylic anhydride (MAAH) to modify ESO and then blended with high-functional active diluent trimethylolpropane triacrylate (TMPTA). Furthermore, FTIR, 1H NMR, and GPC were used to analyze the molecular structure and molecular weight of the oligomers. The oligomers (DMA/MAAESO and DMA/MAAESO-TM) had high esterification rate, curing degree, and good storage stability. The cured coatings from DMA/MAAESO and DMA/MAAESO-TM oligomers had significantly improved thermal stability, tensile, and coating properties. In all samples, DMA/MAAESO-TM cured coating had excellent coating performances. The glass transition temperature (Tg) of DMA/MAAESO-TM was 78.1°C, and its crosslink density (νe) was 6.87 × 10−3 mol/cm3. The hardness, curing time, gloss, flexibility, and impact resistance were H, 20 s, 108.5, 1 mm, and 50 cm, respectively. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of acrylate epoxy soybean oil (AESO) - Synthesis of DMA/MAA - Synthesis of DMA/MAAESO - Preparation of AESO and DMA/MAAESO coatings - Characterization - RESULTS AND DISCUSSION : Synthesis of DMA/MAA and DMA/MAAESO - Structural analysis of AESO and DMA/MAAESO - GPC of AESO and DMA/MAAESO - Physical properties of UV-curable oligomers - Dynamic mechanical analysis of UV-curable coatings - Thermogravimetric analysis of UV-curable coatings - Tensile properties of UV-curable coatings - Coating film properties - Table 1 : Physical properties of oligomers - Table 2 : Dynamic mechanical properties of UV-curable coatings - Table 3 : Thermal properties of UV-curable coatings - Table 4 : Tensile properties of UV-curable coatings - Table 5 : Coating film propertiesTable 6 Comparison of the DMA/MAAESO-TM with other samples in the literature DOI : https://doi.org/10.1007/s11998-023-00787-2 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-023-00787-2.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40171 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
24337	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Preparation of low viscosity and high flexibility epoxy acrylate and its application in UV-curable coatings / Yumei Zhou in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 2 (03/2024)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 2 (03/2024) . - p. 601-610 Titre : Preparation of low viscosity and high flexibility epoxy acrylate and its application in UV-curable coatings Type de document : texte imprimé Auteurs : Yumei Zhou, Auteur ; Jinqing Qu, Auteur Année de publication : 2024 Article en page(s) : p. 601-610 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Copolymère époxy acrylique Copolymères -- Synthèse Oligomères Revêtements -- Propriétés mécaniques Revêtements -- Séchage sous rayonnement ultraviolet Souplesse (mécanique) Thermodurcissables Viscosité Index. décimale : 667.9 Revêtements et enduits Résumé : Epoxy acrylate (EA) is currently the most widely used UV-curable oligomer due to its short curing time, high coating hardness, excellent mechanical property, and thermal stability. To address the problems of high brittleness, poor flexibility, and high viscosity of EA, the UV-curable epoxy acrylate oligomer with low viscosity and high flexibility was prepared and applied to UV-curable coatings. The carboxyl terminated intermediate obtained by the reaction of anhydride and diol was used to modify EA to improve the flexibility of cured film, and the flexibility was adjusted through the length of the carbon chain of diols. The resin viscosity was reduced by partially replacing E51 with binary glycidyl ether. Compared with unmodified EA, the viscosity of the resin prepared in this study decreases from 29800 to 13920 mPa s (25°C), and the flexibility of the cured film increases from 12 to 1 mm. Compared with commercially available modified EA, the raw materials used in this study are low cost and easy to obtain with a reaction temperature below 130°C, using a simple synthesis process, and no organic solvents. Note de contenu : - EXPERIMENT : Raw materials - Synthesis of EA - Synthesis of MHEA - Preparation of UV-cured film - Characterization - Acid value (A v) - Viscosity (V s) - Fourier transform infrared spectroscopy (FTIR) - 1H nuclear magnetic resonance (1H NMR) - Gel permeation chromatography (GPC) - Gel rate of curing film (C gel) - Thermogravimetric analysis (TGA) - Tensile properties testing - Curing time testing - Coating film properties testing - RESULTS AND DISCUSSION : Determination of reaction conditions - Determination of the type of diols - Determination of the type of acid anhydrides - Determination of BDDGE addition amount - Structural analysis of MHEA - Curing process of UV-curable coatings - Thermogravimetric analysis of the cured films - Tensile properties of the cured films - UV-curable coating properties - Table 1 : Effect of kinds of diols on properties of the resin and cured film - Table 2 : Effect of kinds of anhydrides on properties of the resin and cured film - Table 3 : Effect of BDDGE addition on the properties of the resin and cured film - Table 4 : GPC results of E51 and MHEA - Table 5 : TG results of cured film prepared by EA and MHEA - Table 6 : Tensile properties of the EA and MHEA cured films - Table 7 : Comparison of cured film properties DOI : https://doi.org/10.1007/s11998-023-00842-y En ligne : https://drive.google.com/file/d/1PLtHKXgXPTsptg2OK9_saRrfjeXqQFns/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40780 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
24736	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Synthesis of UV-curable polyesters with lateral double bonds by ring-opening polymerization and their properties / Yumei Zhou in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 6 (11/2021)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 6 (11/2021) . - p. 1591-1601 Titre : Synthesis of UV-curable polyesters with lateral double bonds by ring-opening polymerization and their properties Type de document : texte imprimé Auteurs : Yumei Zhou, Auteur ; Shujie Ming, Auteur ; Liuyan Tang, Auteur ; Jinqing Qu, Auteur Année de publication : 2021 Article en page(s) : p. 1591-1601 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anhydrides Caractérisation Catalyseurs Copolymère vinyle ester Copolymérisation Epoxydes Monomères Oligomères Photoréticulation Polyesters Revêtements -- Séchage sous rayonnement ultraviolet Revêtements organiques Stabilité thermique Viscosité Index. décimale : 667.9 Revêtements et enduits Résumé : UV-curable coatings have been receiving more and more attention for their high performance and environmentally friendly advantages, which meet the “5 E” requirements of coating development. Vinyl oligomer is the main factor affecting the performance of UV-curable coating, but it is difficult to meet the requirements of high-end UV curing technology due to its high viscosity, low vinyl functionality, and high cost. Herein, polyesters with lateral double bonds were prepared by ring-opening polymerization of acid anhydride and glycidyl methacrylate. The epoxy compound without vinyl groups was used to participate in the polymerization reaction to adjust the viscosity and vinyl functionality of the resin. Furthermore, the molecular structure and molecular weight of the polyesters were characterized by FTIR, 1H NMR, and GPC. The effects of the categories and proportions of acid anhydride and glycidyl ether on the viscosity and hardness of the coating films were studied. The results indicated that the use of acid anhydrides containing phenyl rigid groups could significantly increase the hardness of the paint film, and the long-chain tertiary glycidyl carbonate (E10P) had the best viscosity reduction effect. When the molar ratio of acid anhydride, GMA and E10P was 4:1:3, the viscosity of the prepared vinyl polyester was low to 2755 mPa·s. In this case, the hardness of the paint film was as high as H, and it also exhibited excellent water resistance and alcohol resistance. Note de contenu : - EXPERIMENTAL : Materials - Preparation of UV-curable polyesters with lateral double bonds - Characterization - RESULTS AND DISCUSSION : Influencing factors of polyester performances - Structural characterization of the polyesters - Analysis of photocuring behavior of the polyesters - Thermal stability of the polyesters - Film properties of the polyesters - Table 1 : Effect of glycidyl methacrylate content on the properties of the polyesters - Table 2 : Effect of anhydride type on the properties of the polyesters - Table 3 : Effect of different epoxy monomers on the properties of the polyesters - Table 4 : Copolymerization of PA and epoxides - Table 5 : Selection of different ring-opening catalysts - Table 6 : GPC results of the polyesters - Table 7 : The film properties of the polyester DOI : https://doi.org/10.1007/s11998-021-00513-w En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00513-w.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36818 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
23146	-	Périodique	Bibliothèque principale	Documentaires	Disponible

---

1 (1 - 3 / 3)