Polypropylene film capacitors are widely used in power transmission and transformation engineering

civil home appliances and new energy equipment. With the development of ultra-high voltage smart grid and other emerging industries

the demands for high-performance film capacitors are increasing. However

at present

the ultra-clean polypropylene raw materials involved in polypropylene film capacitors are completely dependent on import from abroad. Although domestic substitute polypropylene resin raw materials have been developed in China

the processing stability and comprehensive performance are poor when making capacitor films. Once the raw material is out of supply in foreign countries

the polypropylene film capacitor will become a jammed problem. It is urgent to develop the capacitor film production technology suitable for domestic materials and form an independent supporting process. In this paper

along with the process of film-forming technology of domestic capacitive films

the problems found and the progress achieved in the process of experimental verification of the in-depth cooperation between manufacturers and scientific research institutes in related fields are discussed. Firstly

the development status of polypropylene capacitor film is summarized

especially the development progress of domestic capacitor film and its comparison with imported capacitor film. At present

by optimizing the tensile process

chain structure regulation and crystal structure regulation

the domestic crude film reaches or exceeds the level of similar imports in terms of porosity

roughness and dielectric strength

while the metallized film shows better performance in terms of loss and breakdown field strength. The influence of the stretching temperature on the oriented crystal structure of the capacitor film and the relationship between the structural evolution of the film and the electrical properties under different stretching methods (synchronous and asynchronous) are also discussed. These findings provide an important reference for the industrial production and performance optimization of domestic PP capacitive membranes.