等离子体表面氟化处理环氧树脂及其沿面闪络特性研究

Surface Fluorination of Epoxy Resin by Plasma and Its Surface Flashover Characteristics

为加快绝缘子表面电荷消散,提升绝缘子沿面闪络电压,本研究提出了等离子体氟化改性技术,选用与绝缘子配方一致的环氧树脂试样,改变材料表面的处理时间,测试处理前、后试样的表面物理、化学及介电特性。结果表明:等离子体处理作为一种兼具表面物理改性及化学改性的方法,可以在试样表面引入亲水性基团,改变试样表面的浸润性,试样表面粗糙度随处理时间的增加呈先提高后降低的趋势,同时等离子处理可以在材料表面引入F元素,浅化表面陷阱,提升材料的表面电导率,减少表面电荷积聚;在选定参数下,处理9 min后,沿面闪络电压提升至最大值,威布尔分布计算表明提升了约37.17%;过长时间的等离子体表面处理会破坏材料结构,深化表面陷阱,降低表面电导率,降低沿面闪络电压。

In order to accelerate the dissipation of the surface charge and improve the flashover voltage of insulator,we propose the plasma fluorination modification technology.Changing the surface modification time,the surface physical,chemical,and dielectric properties of epoxy resin sample with the same formula as insulator was test before and after modification.The results show that as a method of both physical and chemical surface modification,plasma modification can introduce hydrophilic groups to the surface of the sample and change its wettability.With the increase of modification time,the surface roughness of the sample increases at first and then decreases.At the same time,the plasma modification can introduce fluorine to the surface of the material,shallow the surface traps,improve the surface conductivity,and reduce the accumulation of surface charge.Under the selected parameters,the surface flashover voltage increases to the maximum after modification for 9 minutes,and the Weibull distribution calculation shows that the increase rate is about 37.17%.After plasma surface modification for too long,the material structure is damaged,the surface traps become deeper,the surface conductivity and surface flashover voltage decrease.