Abstract: PI insulating paper with porous structure was successfully prepared by two-step polyimide (PI) preparation process combined with electrospinning technology,and the density of fiber paper was regulated by adjusting the spinning process.By changing the spinning rate,it was found that the bulk density of insulating paper first increased and then decreased;With the increase of the density of insulating paper,the breakdown field strength,dielectric constant and volume resistivity gradually increased.When the spinning rate was 0.06mL/min,the bulk density of the PI fiber paper reached the maximum of 0.43g/cm3.At this time,the tensile strength of insulating paper was 227MPa,the breakdown field strength was 70 kV/mm,the volume resistivity was 1015Ω·m,the dielectric constant was 2.5,and the dielectric loss was only 1.4×10-4.If polyamide acid (PAA) was doped with nano filler in situ,the breakdown field strength of the prepared insulating paper was significantly improved compared with that of undoped insulating paper,indicating that the performance of the insulating paper still had room for improvement and expansion.
张笑瑞, 都书强, 孙雪, 朱兴松, 王诚, 于杨. 体积密度对聚酰亚胺绝缘纸性能影响规律研究[J]. 化工新型材料, 2023, 51(5): 102-105.
Zhang Xiaorui, Du Shuqiang, Sun Xue, Zhu Xingsong, Wang Cheng, Yu Yang. Study on the effect of bulk density on the performance of polyimide insulating paper. New Chemical Materials, 2023, 51(5): 102-105.
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