High temperature resistant polypropylene capactive film and production thereof

Abstract

A polypropylene capacity film in high temperature resistance has lateral thermal contraction rate <=0.2%, lateral tensile strength >=160 MPa and wetting tension >=37 mN / m when it has been placed at 120 deg.C for ten minutes and it can be produced with the process of extruding and plasticizing, filtering, model head setting, cooling for forming, longitudinal preheating tensile setting and lateral preheating tensile setting.

Description

Technical field: [0001] The invention relates to a capacitance film and a production process. Background technique: [0002] The existing polypropylene capacitor film, due to its internal microstructure and other reasons, due to the relatively large transverse heat shrinkage rate, in the process of making and using metallized capacitors, the connection between the metal layers at both ends and the metal coating on the surface of the film is not good, causing the dielectric The loss tangent increases, and the temperature of the capacitor rises, which makes the capacitor easy to break down, and due to the serious lateral shrinkage, the capacity of the capacitor decreases; at the same time, the current products have relatively low voltage resistance, low tensile strength, and poor temperature resistance. . Invention content: [0003] The object of the present invention is to provide a high temperature resistant polypropylene capacitor film with good thermal stability, high t...

AI Technical Summary

Problems solved by technology

[0002] The existing polypropylene capacitor film, due to its internal microstructure and other reasons, due to the relatively large transverse heat shrinkage rate, in the process of making and using metallized capacitors, the connection between the metal layers at both ends and the metal coating on the surface of the film is not good, causing the dielectric The loss tangent increases, and the temperature of the capacitor rises, which makes the capacitor easy to break down, and due to the serious lateral shrinkage, the capacity of the capacitor decreases; at the same time, the current products have relatively low voltage resistance, low tensile strength, and poor temperature resistance.