摘要
不同类型的固化剂所制备的环氧树脂固化物,其理化性能具有显著的差异。为了深入研究不同固化剂分子结构对环氧树脂固化物的电气性能的影响,利用3种常用的酸酐固化剂甲基四氢苯酐(MTHPA)、甲基六氢苯酐(MHHPA)、甲基纳迪克酸酐(MNA)与DER331双酚A环氧树脂反应制备了3种环氧树脂固化物,测试了这3种环氧树脂固化物的体积电阻率和击穿电压。结果表明:当固化剂为MTHPA时,环氧树脂固化物击穿电压最高,为40.4 kV·mm^(-1),体积电阻率为4.29×10^(16)Ω·cm,击穿电压较MNA提高了22.4%,体积电阻率提高了73.0%。基于有限元仿真分析了这3种不同结构环氧树脂固化物分子的最高占据轨道(HOMO)和最低未占据轨道(LUMO)的能级差,研究发现,当采用MTHPA作为固化剂的时候,LUMO-HOMO之差达到最大,为5.56 eV,仿真结果表明环氧树脂固化物能级差大小为MTHPA>MHHPA>MNA,该结果和实验结果一致。
The physicochemical properties of epoxy resin cured by different types of curing agent are significantly different.In order to further study the influence of different molecular structure of curing agent on epoxy resin curing electrical properties,three kinds of commonly used acid anhydride curing agent including Methyltetrahydrophthalic anhydride(MTHPA),methylhexahydrophthalic anhydride(MHHPA),methylnadic anhydride(MNA)respectively reacted with DER331 bisphenol A epoxy resin to prepare three kinds of cured epoxy resin.The volume resistivity and breakdown voltage of the cured epoxy resins were measured.The results showed that when curing agent was MTHPA,the highest breakdown voltage and volume resistivity of cured epoxy resin with thickness of 1mm were 40.4 kV and 4.29×10^(16)Ω·cm,respectively.Compared with curing agent MNA,the breakdown voltage and volume resistivity of cured epoxy resin with thickness of 1mm were improved by 22.4%and 73.0%,respectively.At the same time,the energy level difference between the highest HOMO and the lowest unoccupied HOMO of the cured epoxy resin with three different structures was analyzed based on finite element simulation.It was found that when MTHPA was used as the curing agent,the maximum LUMO-HOMO difference was 5.56eV.The simulation results showed that the energy level difference of cured epoxy resin was MTHPA>MHHPA>MNA,which was consistent with the experimental results.
作者
黄基宏
麦宇翔
黄常元
杨威
颜丙越
杜斌
HUANG Ji-hong;MAI Yu-xiang;HUANG Chang-yuan;YANG Wei;YAN Bing-yue;DU Bin(School of Electrical and Automation Engineering,Hefei University of Technology,Hefei Anhui 230009,China;Global Energy Internet Research Institute Co.,Ltd.,Beijing 100000,China;State Grid Corporation of China,Beijing 100000,China)
出处
《当代化工》
CAS
2023年第1期72-76,共5页
Contemporary Chemical Industry
基金
国家电网有限公司总部科技项目资助,特高压GIS开关设备用芳纶绝缘拉杆关键技术研究(项目编号:5500-202158245A-0-0-00)。
关键词
环氧树脂
固化剂
体积电阻率
击穿电压
有限元分析
Epoxy resin
Curing agent
Volume resistivity
Breakdown strength
Finite element analysis
