蒙脱土/聚酰亚胺纤维纸基材料绝缘及介电性能研究

Research on Insulating Performance and Dielectric Properties of Montmorillonite/Polyimide Fiber Paper-based Material

关键词:  聚酰亚胺纤维  绝缘纸  蒙脱土  介电性能

Key Words:polyimide fiber  insulating paper  montmorillonite  dielectric properties

摘要:本研究通过单因素分析法，探究了纸张定量及蒙脱土含量对聚酰亚胺纤维纸基材料的物理性能和介电性能的影响规律。结果表明，不同定量聚酰亚胺纤维纸基材料的外观无明显差别，当纸张定量为80 g/m²时，聚酰亚胺纤维纸基材料具有最优的物理性能，抗张指数和撕裂指数分别达15.0 N·m/g和19.7 mN·m²/g；当蒙脱土含量为6%时，蒙脱土/聚酰亚胺纤维纸基材料的体积电阻率最大，达2.59×10¹⁵ Ω·m；当蒙脱土含量达8%时，蒙脱土/聚酰亚胺纤维纸基材料具有最佳的绝缘性能，工频击穿强度达17.34 kV/mm，在50 Hz的频率下，其相对介电常数、介电损耗分别达4.99和0.23。

Abstract:In this study， the effects of paper basis weight and montmorillonite content on the physical performances and dielectric properties of polyimide fiber paper-based materials were investigated by monofactor analysis method. The results showed that there was no significant difference in the appearance of polyimide fiber paper-based materials with different paper basis weight. When the paper basis weight was 80 g/m²， the polyimide fiber paper-based materials had the optimal physical performances， with the tensile index and tear index reaching 15.0 N·m/g and 19.7 mN·m²/g， respectively. When the dosage of montmorillonite was 6%， the volume resistivity of montmorillonite/polyimide fiber paper-based material achieved the highest value， reaching 2.59×10¹⁵ Ω·m. When the dosage of montmorillonite reached 8%， the montmorillonite/polyimide fiber paper-based material possessed the best insulation performance， the puncture intensity with working frequency reached 17.34 kV/mm， and the relative permittivity and dielectric loss reached 4.99 and 0.23， respectively， at the frequency of 50 Hz.