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 |
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 21, N° 2 (03/2024) . - p. 601-610