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Synthesis of epoxy-based silicone prepolymers with UV/moisture dual curability for applications in anti-graffiti coatings

环氧树脂 材料科学 硅酮 固化(化学) 复合材料 硅氢加成 硅氧烷 预聚物 极限抗拉强度 有机硅树脂 聚合物 光致聚合物 化学工程 高分子化学 涂层 聚合 聚氨酯 有机化学 化学 催化作用 工程类
作者
Fuping Bian,Xiaoquan Li,Jihe Zhao,Xuefeng Gui,Jiwen Hu,Shi Li,Shudong Lin
出处
期刊:Reactive & Functional Polymers [Elsevier]
卷期号:180: 105396-105396 被引量:7
标识
DOI:10.1016/j.reactfunctpolym.2022.105396
摘要

Ultraviolet (UV) photocuring technology has gained importance in crosslinking of polymers, as it allows fast curing rate, low energy consumption and no volatile organic compounds (VOCs). However, the photopolymerization of very thick films and in shadow areas where the light penetration is inhibited (e. g. in filled, pigmented, dispersed samples) remains a huge challenge. As reported herein, a simple hydrosilylation reaction was employed to synthesize epoxy-based silicone prepolymers. Firstly, the structures of the synthesized epoxy-based silicone prepolymers were characterized by Fourier-transform infrared (FT-IR) and proton nuclear magnetic resonance (1H NMR) spectroscopy techniques, thus confirming the successful synthesis of these prepolymers. The epoxy group of prepolymers could be crosslinked under UV irradiation, and its silicone methoxy group (-SiOCH3) was condensed under moisture ambient, so as to acquire both thick coatings and pigmented coatings due to the dual-curing approach. Moreover, water droplets exhibit water contact angles between 103° and 108° on these coatings, and surface energies of the these coatings are from 25.27 to 22.67 mN/m. The transparency of these coatings is over 90%. They remain stable at temperatures reaching up to 332.2 to 344.8 °C, thus demonstrating that they have excellent heat resistance. The coatings exhibited good mechanical properties with a tensile strength >4.57 MPa. Finally, the coatings have good anti-smudge and anti-fingerprint properties, and the overall results show that these films have potential applications as anti-smudge coatings.
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