催化剂对基于动态酯交换Vitrimers材料性能的影响  

Effect of Catalysts on the Performance of Vitrimers Based on Dynamic Ester Exchange

作　　者：刘贺晨 魏利伟 孙章林 刘畅 刘云鹏 Liu Hechen;Wei Liwei;Sun Zhanglin;Liu Chang;Liu Yunpeng(Hebei Key Laboratory of Green and Efficient New Electrical Materials and Equipment,North China Electric Power University,Baoding 071003,China;State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources,North China Electric Power University,Beijing 102206,China)

机构地区：[1]河北省绿色高效电工新材料与设备重点实验室(华北电力大学),保定071003 [2]新能源电力系统全国重点实验室(华北电力大学),北京102206

出　　处：《电工技术学报》2024年第16期5134-5148,共15页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(52007062);中央高校基本科研业务费专项资金(20226934)资助项目。

摘　　要：传统环氧树脂作为干式变压器、电压互感器和复合绝缘子等电工装备的主要原材料,有着良好的力学性能和电学性能,但是其固化后形成的交联网络难溶难熔。随着环氧树脂基电工装备运行年限的增长,大量退役设备的处理面临巨大的挑战。该文制备了基于酯交换的酸酐固化类玻璃化环氧树脂材料(Vitrimers),系统地研究了催化剂对树脂力学、电学、热学以及动态交换性能的影响规律,并使用醇类溶液探索其降解性能。研究结果显示,与传统环氧树脂相比,Vitrimers体系的断裂伸长率较高,表现出良好的韧性。在Vitrimers体系中以1,5,7-三叠氮双环(4.4.0)癸-5-烯(TBD)为催化剂的Vitrimers具有较佳的综合特性,在高温下表现出良好的应力弛豫特性,且能够在7h(190℃)全部溶解于乙二醇(EG)溶液中。该文研究结果表明,类玻璃化环氧树脂有较综合的力-热-电特性,能够快速溶解于降解溶液,有望用作电工装备的新型环保树脂基体。Epoxy resins are widely used in electrotechnical equipment because of their dimensional stability,resistance to cracking,and excellent electrical insulation and mechanical properties after curing.However,the irreversible crosslinking network of traditional thermosetting epoxy resins makes it difficult to degrade and recycle.As the operating life of epoxy resin-based electrotechnical equipment increases,the management of large quantities of thermoset waste faces great difficulties.Current recycling methods of resin waste are environmentally polluting,energy intensive,and do not meet the eye of sustainable development.In order to elimate thermosetting epoxy resin waste from the source,this paper investigates the effect of catalyst type on the performance of glass-like epoxy resins(Vitrimers)and explores the degradation rate of different resin systems in alcohol solutions.Firstly,different Vitrimers systems,named V-TBD,V-TEOA,V-Sn,V-Zn,were prepared using 1,5,7-triazabicyclo(4.4.0)dec-5-ene(TBD),triethanolamine(TEOA),stannous isooctanoate(Sn(Oct)2),and zinc acetylacetonate(Zn(acac)2)as catalysts in this paper.Comparatively,we analyzed the conventional resins(T-DMP)and different Vitrimers for their mechanical,electrical and thermal properties.The results showed that compared with the conventional epoxy resin,the tensile strength,flexural strength and electrical properties of Vitrimers were reduced,but its elongation at break was higher and showed good toughness.Among them,the comprehensive mechanical properties of V-TEOA was second only to T-DMP.Its tensile strength,bending strength and elongation at break were 77.33 MPa,23.08 MPa and 10.98%,respectively.V-TBD had high retention rate of electrical insulation properties.It had only 5.2% decrease in breakdown strength,and the leakage current and dielectric loss factor were slightly higher than those of T-DMP.Catalysts containing metal ions led to a serious degradation of the electrical properties of Vitrimers.In addition,the thermal stability of all Vitrimers systems w

关 键 词：类玻璃化环氧树脂材料 环氧树脂 催化剂 降解 电工装备 

分 类 号：TM21[一般工业技术—材料科学与工程]