轨道交通牵引电机用耐电晕聚酰亚胺材料的制备及性能研究  

Research on preparation and properties of corona-resistant polyimide for traction motor in rail transit

作　　者：刘杰 王进[1] 江乾[1] 胡峰[1] 钟敏 高纪明 黄安民[1] 杨军[1] LIU Jie;WANG Jin;JIANG Qian;HU Feng;ZHONG Min;GAO Jiming;HUANG Anmin;YANG Jun(Zhuzhou Times New Material Technology Co.,Ltd.,Zhuzhou 412007,China)

机构地区：[1]株洲时代新材料科技股份有限公司,湖南株洲412007

出　　处：《绝缘材料》2024年第8期61-65,共5页Insulating Materials

基　　金：湖南省重点研发计划项目(2022GK2036)

摘　　要：普通聚酰亚胺应用于轨道交通牵引电机绝缘结构中,容易引发电晕击穿失效,严重影响电机长期运行的可靠性和安全性。本文以4,4′-二氨基二苯醚(ODA)为二胺,均苯四甲酸二酐(PMDA)为二酐,以不同硅烷偶联剂表面处理的纳米氧化铝为无机填料制备了3种耐电晕聚酰亚胺材料。探讨了不同偶联剂对耐电晕聚酰亚胺的表面形貌、力学性能、耐电晕寿命、电击穿性能的影响。结果表明:硅烷偶联剂表面处理使得氧化铝在聚酰亚胺基体中的分散性得到改善,降低了纳米氧化铝的团聚程度,提高了聚酰亚胺材料的耐电晕特性,同时保持了其优异的力学性能。其中采用双氨基的硅烷偶联剂表面处理后的纳米氧化铝在DMAc中的分散稳定性最佳,所制备的耐电晕聚酰亚胺材料表面形貌及综合性能也为最佳,在试验电压为3kV和2kV下的耐电晕时间分别为25min和120min,拉伸强度达167MPa,断裂伸长率为29.5%。The application of conventional polyimide in the insulation structure of rail transit traction motors is prone to corona breakdown failure,which seriously affects the reliability and safety of the motor's long-term operation.In this paper,three corona-resistant polyimide materials were prepared by using 4,4′-diaminodiphenyl ether(ODA)as the diamine,pyromellitic dianhydride(PMDA)as the dianhydride,and nano-alumina surface treated with different silane coupling agents as the inorganic filler.The impact of various coupling agents on their surface morphology,mechanical properties,coronaresistant lifetime,and electrical breakdown performance were investigated.The results show that the surface treatment with silane coupling agents can improve the dispersibility of alumina in the polyimide matrix,reduce the agglomeration of nanoalumina,and enhance the corona-resistant properties of the polyimide material,while its excellent mechanical properties are maintained.Among them,the dispersion stability of nano-alumina surface treated with bis-amino silane coupling agent is the best,and the prepared corona-resistant polyimide material also has the best surface morphology and comprehensive performance.The corona-resistant time is 25 min and 120 min,respectively under 3 kV and 2 kV,the tensile strength reaches 167 MPa,and the elongation at break is 29.5%.

关 键 词：氧化铝 聚酰亚胺 耐电晕 绝缘强度 力学性能 

分 类 号：TM215[一般工业技术—材料科学与工程]