WET NONWOVEN FABRIC CONTAINING META-ARAMID AND POLYPHENYLENE SULFIDE AND LAMINATED SHEET OF THE SAME

In order to provide electrical insulating paper and an electrical insulating sheet including the same which exhibit excellent dielectric breakdown strength， excellent hygroscopic dimensional stability and thermal dimensional stability， and excellent tear strength and wear durability， a nonwoven fabric is fabricated wherein the fabric is a wet nonwoven fabric containing a meta-aramid fiber and a polyphenylene sulfide short fiber and a proportion of the polyphenylene sulfide short fiber at least partially fused in the wet nonwoven fabric is 40% or less， and the wet nonwoven fabric has a dielectric breakdown strength of 17 kV/mm or more.

为获得兼具优异介电击穿强度、吸湿尺寸稳定性、热尺寸稳定性，以及优异撕裂强度与耐磨耐久性能的电绝缘纸及包含该电绝缘纸的电绝缘片材，本发明制备了一种湿法非织造布（wet nonwoven fabric）。该湿法非织造布包含间位芳纶纤维（meta-aramid fiber）与聚苯硫醚短纤维（polyphenylene sulfide short fiber），且其中至少部分熔融的聚苯硫醚短纤维占比不超过40%，同时该湿法非织造布的介电击穿强度不低于17 kV/mm。