Cailiao Baohu (Jul 2022)

Preparation and Properties of High - Solid， Low - Viscosity and UV - Curable Star Polyester

  • ZHOU Yu - mei, MING Shu - jie, DUAN Xiao - jun, PENG Gang - yang, ZHU Yan - an, QU Jin - qing

DOI
https://doi.org/10.16577/j.issn.1001-1560.2022.0197
Journal volume & issue
Vol. 55, no. 7
pp. 155 – 159

Abstract

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To overcome the shortcomings of the existing UV - curable vinyl polyesters, such as high viscosity and low curable functionality, the small molecular polyol was adopted to be used as the core to react with the anhydride to form the semi - ester firstly, and then react with the glycidyl methacrylate (GMA) via a ring - opening reaction to obtain vinyl star polyester with high solid and low viscosity. The effects of the anhydride and polyol types on the viscosity and film performances of star polyester were studied. The molecular structure and molecular weight of the polyester were characterized by Fourier transform infrared spectroscopy (FT - IR), 1H nuclear magnetic resonance (1H NMR) and gel permeation chromatography (GPC). Results showed that the number - average molecular weights of the star polyesters were ranged from 1 149 to 1 645 g/mol and the polymer dispersity index (PDI) was within 1.2. The viscosity of the polyester and the hardness of the polyester film increased with the augment of hydroxyl functionality of the polyol. Finally, with the modification through the introduction of polyether polyol (N210), the viscosity of the resin was reduced to 2 025 mPa·s, the hardness of the coated film reached 2 H, and the polyester film obtained an excellent adhesion and flexibility.

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