Method for processing and preparing BOPP (Biaxially-oriented Polypropylene) capacitor film

The invention discloses a processing and preparing method of a BOPP capacitor film, and belongs to the technical field of polypropylene capacitor films. The method comprises the following steps: melting and homogenizing polypropylene granules in a double-bolt extruder to obtain a polypropylene melt; transferring the polypropylene melt to a quenching roller through a slit mouth mold of the double-bolt extruder, and carrying out tape casting to form a cast sheet; and cutting the casting sheet into a sheet material with a preset size, preheating the sheet material, and putting the preheated sheet material in a bidirectional stenter for stretching processing so as to prepare the BOPP capacitor film. The BOPP capacitor film prepared by the invention has higher breakdown field strength and good performance reliability. 本发明公开了一种BOPP电容膜的加工制备方法，属于聚丙烯电容膜技术领域。本发明方法，包括：将聚丙烯粒料在双螺栓挤出机中进行熔融均化，得到聚丙烯熔体；将所述聚丙烯熔体经过所述双螺栓挤出机的狭缝口模转移到急冷辊上流延成型为铸片；将所述铸片裁剪成预设尺寸的片材，对所述片材进行预热，将预热后的片材放置在双向拉幅机中进行拉伸加工，以制备得到BOPP电容膜。本发明制备的BOPP电容膜具有更高击穿场强和良好性