Nanometer indium tin oxide doped high-dielectric polypropylene-based composite dielectric film for film capacitor and preparation method thereof

Abstract

The invention relates to the field of preparation of dielectric film materials, in particular to a nanometer indium tin oxide doped high-dielectric polypropylene-based composite dielectric film for a film capacitor and a preparation method thereof. The composite film uses a polypropylene film with the thickness smaller than or equal to 5 microns as a basic film, a spherical ferroferric oxide magnetic powder and nanometer indium tin oxide doped nano crystalline cellulose/polyvinylidene chloride composite coating with the thickness smaller than or equal to 5 microns is arranged on the surface of the basic film, has good compatibility with the polypropylene film, is firm in absorption, excellent in mechanical property, high in strength and good in toughness and has higher dielectric constants and lower dielectric loss, the dielectric performance is stable, the advantages of organic/inorganic dielectric materials are fully integrated, and the nanometer indium tin oxide doped high-dielectric polypropylene-based composite dielectric film is suitable for large-scale production and can be used for production of the small-sized large-capacity light-weight film capacitor.

Description

technical field [0001] The invention relates to the field of preparation of dielectric film materials, in particular to a high-dielectric polypropylene-based composite dielectric film for film capacitors mixed with nanometer indium tin oxide and a preparation method thereof. Background technique [0002] Film capacitors, also known as plastic film capacitors, are a type of capacitor with plastic film as the dielectric. Among all film capacitors, polypropylene capacitors are the most widely used in practical use due to their unique advantages. With the development of the industry, electronic products have higher and higher requirements on the performance of capacitors such as lightweight and high capacity. However, the dielectric constant of polypropylene film is low, making it difficult to make high-performance capacitors, which restricts the application of polypropylene capacitors. [0003] At present, the common method for improving the dielectric constant of polypropylene...

AI Technical Summary

Problems solved by technology

With the development of the industry, electronic products have higher and higher requirements on the performance of capacitors such as light weight and high capacity. However, the dielectric constant of polypropylene film is low, which makes it difficult to make high-performance capacitors, which restricts the application of polypropylene capacitors.

[0003] At present, the common method for improving the dielectric constant of polypropylene film is mainly to fill polypropylene with organic or inorganic compounds with high dielectric constant. Organic dielectric materials have the advantages of good flexibility and easy processing and molding, but they are not durable. Disadvantages such as high temperature and poor stability, while the disadvantages of inorganic dielectric materials are poor film processing performance and increased dielectric loss