Liu Yunpeng, Wang Wanxian, Liu Hechen, Zhang Mingjia, Liu Jie, Qi Junwei
Hebei Provincial Key Laboratory of Power Transmission Equipment Security Defence, North China Electric Power University, Yonghua North Street No. 619, Baoding 071003, China.
State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Yonghua North Street No. 619, Baoding 071003, China.
Polymers (Basel). 2022 Jun 13;14(12):2394. doi: 10.3390/polym14122394.
In order to promote the application of composite insulators in coastal areas with high temperature, high humidity and high salt, it is of great importance to develop matrix resin with salt corrosion resistance for composite core rods. In this study, bisphenol A epoxy resin was modified by blending with alicyclic epoxy resin (2021P). Three different proportions of 2021P/DGEBA blend resins (0% 2021P/DGEBA, 10% 2021P/DGEBA and 20% 2021P/DGEBA) were prepared, and the high salt medium corrosion test was carried out. The physicochemical (FTIR, DMA, TGA) and electrical properties (dielectric loss, leakage current and breakdown field strength) of the blend resin before and after aging were tested and analyzed, and the optimal blend proportion was determined. The results showed that after salt aging, the Tg of 0% 2021P/DGEBA decreased to 122.99 °C, while the Tg of 10% 2021P/DGEBA reached 134.89 °C; The leakage current of 0% 2021P/DGEBA increased to 48.994 μA, while that of 10% 2021P/DGEBA only increased to 44.549 μA; The breakdown field strength of 0% 2021P/DGEBA dropped to 40.36 kv/mm, while that of 10% 2021P/DGEBA only dropped to 43.63 kv/mm. The introduction of 2021P enhanced the salt corrosion resistance of the blend resin, which could hinder the penetration, diffusion and erosion of external media (such as Na, Cl, HO, etc.) to the matrix resin. The comprehensive properties of 10% 2021P/DGEBA blend system reached the best, which was better than other blending resins, showing great application potential.
为促进复合绝缘子在高温、高湿、高盐的沿海地区应用，开发具有耐盐腐蚀性能的复合芯棒基体树脂具有重要意义。本研究通过将双酚A环氧树脂与脂环族环氧树脂（2021P）共混进行改性。制备了三种不同比例的2021P/DGEBA共混树脂（0% 2021P/DGEBA、10% 2021P/DGEBA和20% 2021P/DGEBA），并进行了高盐介质腐蚀试验。对老化前后共混树脂的物理化学性能（FTIR、DMA、TGA）和电气性能（介电损耗、泄漏电流和击穿场强）进行了测试分析，确定了最佳共混比例。结果表明，盐老化后，0% 2021P/DGEBA的玻璃化转变温度（Tg）降至122.99℃，而10% 2021P/DGEBA的Tg达到134.89℃；0% 2021P/DGEBA的泄漏电流增至48.994μA，而10% 2021P/DGEBA的泄漏电流仅增至44.549μA；0% 2021P/DGEBA的击穿场强降至40.36 kv/mm，而10% 2021P/DGEBA的击穿场强仅降至43.63 kv/mm。2021P的引入增强了共混树脂的耐盐腐蚀性，可阻碍外部介质（如Na、Cl、HO等）对基体树脂的渗透、扩散和侵蚀。10% 2021P/DGEBA共混体系的综合性能达到最佳，优于其他共混树脂，具有很大的应用潜力。
