可回收高性能双固化环氧树脂的制备及其电气性能  

Preparation and electrical properties of recyclable high performance dual-curing epoxy resin

作　　者：王浩欢 秦岭 王天兴 史玲娜[1] 吴金锁 文森 WANG Haohuan;QIN Ling;WANG Tianxing;SHI Lingna;WU Jinsuo;WEN Sen(National Engineering and Research Center for Mountainous Highways,China Merchants Chongqing Communications Research&Design Institute CO.,LTD.,Chongqing 400067,China;Chongqing Daba Mountains New Material CO.,LTD.,Chongqing 401120,China;Chongqing Expressway Engineering Consultant CO.,LTD.,Chongqing 401120,China)

机构地区：[1]国家山区公路工程技术研究中心招商局重庆交通科研设计院有限公司,重庆400067 [2]重庆大巴山新材料有限公司,重庆401120 [3]重庆高速工程顾问有限公司,重庆401120

出　　处：《复合材料学报》2024年第8期4103-4112,共10页Acta Materiae Compositae Sinica

基　　金：重庆市交通科技项目(2022-02);重庆市技术创新与应用发展专项重点项目(CSTB2022TIAD-KPX0116,CSTB2022TIAD-KPX0117);交通运输行业重点科技项目(2022-ZD3-023)。

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。现有的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较优,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。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 h,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.

关 键 词：可回收 高性能 酯交换 双固化环氧树脂 力学性能 电气性能 

分 类 号：TB332[一般工业技术—材料科学与工程]