Capacitor paper and preparation method thereof

The invention provides capacitor paper and a preparation method thereof, the capacitor paper comprises a first body paper layer and a polymer layer which are arranged in sequence, or the capacitor paper comprises the first body paper layer, the polymer layer and a second body paper layer which are arranged in sequence, the thickness of the first body paper layer and the second body paper layer is 6-60 microns, and the dry coating weight of a polymer in the polymer layer is 0.01-20.0 g/m < 2 >. The capacitor paper prepared by the invention not only can improve the breakdown voltage resistance of the capacitor paper, but also can reduce the low equivalent series resistance (ESR) value of the capacitor paper at the same time. 本发明提供一种电容器纸及其制备方法，包括依次设置的第一原纸层和聚合物层，或包括依次设置的第一原纸层、聚合物层和第二原纸层，所述第一原纸层和第二原纸层的厚度为6～60μm，所述聚合物层中聚合物的干涂布量为0.01-20.0g/m2。本发明制备的电容器纸不仅能提高电容器纸的耐击穿电压的性能，而且还能同时降低电容器纸的低等效串联电阻(ESR)值。