Preparation and electrical properties of recyclable high performance dual-curing epoxy resin
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摘要: 环氧树脂为交通电气化进程提供了优异的绝缘、支撑和保护功能，但传统环氧树脂难以回收，这不符合绿色交通的可持续发展目标。现有可回收环氧树脂综合性能较差，限制了其在交通电气化进程中的应用，亟需开发高性能可回收的环氧树脂。本文提出了光敏油基树脂和环氧树脂的光-热双固化方法，利用酯交换机制，在无催化剂的高温高压环境下实现了双固化环氧树脂的回收，同时回收树脂仍保持出色的理化和电气性能。结果表明：回收前双固化环氧树脂的综合性能良好；回收树脂的粒径越小、热压压强越大，回收后树脂的理化和电气性能越好，在220℃、10 MPa的环境下热压3 h后回收树脂的综合性能最佳，弯曲和拉伸强度恢复率分别为92.0%和93.7%，工频下介电常数和介质损耗与回收前相差不大，击穿强度恢复率达到98.4%。该树脂在推进交通电气化的过程中具有一定潜力和应用前景。Abstract: Epoxy resins play a crucial role in providing insulation, support, and protection for the electrification process in transportation. However, the conventional methods of recycling epoxy resins are quite complex and do not align with the sustainability goals of green transportation. There is an urgent need to develop environmentally friendly and recyclable epoxy resins. To address the issues related to the physical, chemical, and electrical properties of recyclable epoxy resins, this paper introduces a novel photothermal dual-curing method that combines photosensitive oil-based resin with epoxy resin. This innovative approach leverages the transesterification mechanism to recover the dual-curing epoxy resin under high-temperature and high-pressure conditions without the need for a catalyst. Remarkably, the recovered resin retains excellent physical, chemical, and electrical properties. The study demonstrates that the initial properties of the dual-curing epoxy resin are promising. The quality of the recovered resin improves with smaller resin particle sizes and higher hot pressing pressures. After undergoing a hot pressing process at 220℃ and 10 MPa for 3 hours, the recovered resin exhibits its best comprehensive properties, with recovery rates of 92.0% for bending strength and 93.7% for tensile strength. Furthermore, the dielectric constant and dielectric loss at power frequency remain largely unchanged compared to their values before recovery, with a remarkable breakdown strength recovery rate of 98.4%. This research highlights the significant potential and application prospects of dual-curing epoxy resin in advancing the electrification of transportation.
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图 1 双固化环氧树脂的制备与回收过程
Figure 1. Preparation and recovery process of dual-curing epoxy resin
图 2 L回收颗粒(a)和S回收颗粒(b)的宏观、微观形貌和粒径分布
Figure 2. Macro, micro morphology and size distribution of the L (a) and S (b) particles
图 4 双固化环氧树脂的热压回收过程
Figure 4. Recovery process of dual-curing epoxy resin by hot pressing
图 5 双固化环氧树脂固化过程(a)与回收过程(b)的FTIR红外光谱及树脂回收后的DSC测试(c)
Figure 5. FTIR spectra of dual-curing epoxy resin at different curing stages (a) and before and after recycling (b), DSC of the dual-curing epoxy resins after recycling (c).
图 6 双固化环氧树脂回收前后弯曲强度(a)和拉伸强度(b)
Figure 6. Bending strength (a) and tensile strength (b) of the dual-curing epoxy resin before and after recycling
图 8 双固化环氧树脂回收前后的介电常数
Figure 8. Dielectric constant of dual-curing epoxy resin before and after recycling
图 9 双固化环氧树脂回收前后的介电损耗
Figure 9. Dielectric loss of dual-curing epoxy resin before and after recycling
图 10 双固化环氧树脂回收前后的击穿强度
Figure 10. Breakdown voltage of dual-curing epoxy resin before and after recycling
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