Nano-barium-titanate-doped polypropylene-based composite dielectric film used for film capacitors and preparation method of nano-barium-titanate-doped polypropylene-based composite dielectric film

Abstract

The invention relates to the field of dielectric film material preparation, in particular to a nano-barium-titanate-doped polypropylene-based composite dielectric film used for film capacitors and a preparation method of the nano-barium-titanate-doped polypropylene-based composite dielectric film. A polypropylene film with the thickness smaller than or equal to 5 micrometers serves as a base film of the composite film. The surface of the base film is coated with a nano-barium-titanate-doped nanocrystal cellulose / polyvinylidene chloride composite coating with the thickness smaller than or equal to 5 micrometers, wherein the nano-barium-titanate-doped nanocrystal cellulose / polyvinylidene chloride composite coating is obtained by drying nano-barium-titanate-doped nanocrystal cellulose / polyvinylidene chloride composite coating liquid. The coating obtained after drying is excellent in mechanical property, light in weight and firm, has a high dielectric constant and low dielectric loss, and is compact and smooth in film layer and stable for heat, the advantages of organic / inorganic dielectric materials are fully combined, the production and preparation process is simple, and the nano-barium-titanate-doped polypropylene-based composite dielectric film is suitable for large-scale production and can be used for producing miniaturized and high-capacity film capacitors.

Description

technical field [0001] The invention relates to the field of preparation of dielectric thin film materials, in particular to a polypropylene-based composite dielectric thin film mixed with nanometer barium titanate for film capacitors 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 film i...

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