间位芳纶树脂对牵引电机用耐高温绝缘漆的改性研究

Research on Modification of Meta-aramid Resin on High Temperature Resistant Insulating Varnish for Traction Motor

采用间位芳纶树脂对聚酯亚胺绝缘漆进行改性,制得了一种牵引电机用耐高温绝缘漆。研究了间位芳纶树脂对绝缘涂层附着力、电气性能、阻燃性能和耐热性能的影响。结果表明:当间位芳纶树脂用量为15%时,绝缘涂层的电气强度达65 kV/mm,附着力达12.9 MPa,氧指数可达28.7%,在220℃下经500 h耐高温试验后漆膜无开裂脱落,仅轻微变色,可满足牵引电机的使用要求。

A high temperature resistant insulating varnish for traction motors was prepared by modifying polyester imide insulating varnish with meta-aramid resin.The effects of meta-aramid resin on the adhesion,electrical properties,flame retardancy,and heat resistance of the insulating coating were studied.The results show that when the content of meta-aramid resin is 15%,the electrical strength,the adhesion,the oxygen index of the insulating coating reaches 65 kV/mm,12.9 MPa,28.7%,respectively.After high temperature test at 220℃for 500 h,the paint film shows slight discoloration without cracking and peeling off,which can meet the requirements of the traction motors.