摘要： 【目的】针对桐油基固化膜力学性能不足的缺陷，开发高环氧含量桐油基环氧树脂并构建高性能固化膜。【方法】以桐油酸为原料，通过与马来酸酐、环氧氯丙烷反应制备桐油基三缩水甘油酯，进而将双键环氧化获得高环氧含量的环氧桐油基三缩水甘油酯（ ETME'）进而与生物酚单宁酸进行热固化构建桐油基环氧固化膜。【结果】成功合成环氧当量为 188. 75 g/mol的 ETME'，，在单宁酸酚羟基与 ETME'环氧基物质的量比为 2. 5∶1时，所制备的 ETME'基固化膜凝胶率可达 97%，拉伸强度超过 10 MPa、铅笔硬度为 4H，并兼具优异的热稳定性和良好附着力。【结论】本研究通过生物酚类固化剂与高环氧含量桐油基树脂的协同作用，为高性能桐油基环氧固化膜的开发提供了一种有效的构建策略。
关键词:
桐油,
三缩水甘油酯,
环氧树脂,
单宁酸,
固化膜,
力学性能
Abstract: ［Objective］To address the limitation of insufficient mechanical strength in tung oil-based cured films，a tung oil-based epoxy resin with high epoxy content was developed and a high-performance cured film was constructed.［Method］ Tung oil-based triglycidyl ester was preparedusing tung oil acid as the raw material to react with maleic anhydride and epichlorohydrin. The doublebonds were epoxidized to obtain epoxy tung oil-based triglycidyl esters（ETME'） with high epoxy content，which was then thermally cured with bio-phenolic tannic acid to construct tung oil-based epoxy cured film.［Results］ ETME' with epoxy equivalent of 188. 75 g/mol was successfullysynthesized. When the molar ratio of phenolic hydroxyl in tannic acid to epoxy groups in ETME' was 2. 5∶1，the gelation rate of the ETME'-based cured film could reach 97%，the tensile strength exceeded 10 MPa，the pencil hardness was 4H，as well as the cured film possessed excellent thermal stability and good adhesion.［Conclusion］ An effective construction strategy for the development of high-performance tung oil-based epoxy cured films by the synergistic effect of bio-phenolic curing agentsand tung oil-based epoxy resins with high epoxy content was proposed.
Key words:
tung oil,
triglycidyl esters,
epoxy resin,
tannins,
curing film,
mechanical properties
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