Method for improving deep drawing performance of aluminum-plastic film

Abstract

The invention relates to a method for improving the deep drawing performance of an aluminum-plastic film for a lithium battery flexible package material. The aluminum-plastic film comprises a heat-resistant resin film, an aluminum foil and a thermoplastic resin film which are arranged in sequence, wherein the heat-resistant resin film and the aluminum foil, and the thermoplastic resin film and thealuminum foil are respectively adhered through an adhesive; the thermoplastic resin film is a PP film, a 2000-10000 ppm slipping agent is added in the preparation process of the PP film, and the slipping agent is one or more of an amide slipping agent, ester with high carbon number and amine oxide. According to the method disclosed by the invention, the addition amount of the slipping agent is controlled in the preparation process of a specific layer (namely the PP film layer) of the specific aluminum-plastic film, the friction force between the PP film of the aluminum-plastic film and the surface of a die is improved, the deep drawing performance of the aluminum-plastic film is improved, the deep drawing limit depth reaches 6 mm or above, and the continuous productivity of the aluminum-plastic film can be improved.

Description

technical field [0001] The invention belongs to the technical field of aluminum-plastic films for flexible packaging materials of lithium batteries, and particularly relates to a method for improving the drawing performance of aluminum-plastic films for flexible packaging materials of lithium batteries. Background technique [0002] Aluminum-plastic film is an important outer packaging material for flexible packaging of lithium-ion batteries. The traditional aluminum-plastic film structure usually includes heat-resistant resin film, metal aluminum foil and thermoplastic resin film arranged in sequence. The resin film and the metal aluminum foil are respectively bonded by an adhesive. [0003] When the aluminum-plastic film for flexible packaging of lithium ion battery is used for battery molding, it needs to be processed by deep drawing. Since the inner layer of the traditional aluminum-plastic film uses PP as the thermoplastic resin film, it is easy to break the aluminum-pl...

AI Technical Summary

Problems solved by technology

[0003] When the aluminum-plastic film for flexible packaging of lithium-ion batteries is used for battery molding, it needs to go through deep-drawing processing, and because the inner layer of the traditional aluminum-plastic film uses PP as a thermoplastic resin film, it is easy to break through the aluminum-plastic film when it is deep-drawn

At present, for the improvement of the drawing performance of this type of aluminum-plastic film, there is a method of improving the drawing performance between the aluminum-plastic film and the mold by brushing a smooth coating liquid on the surface of the aluminum-plastic film, as disclosed in Chinese patent CN110760259A A smooth coating solution for aluminum-plastic film and its coating process, the coating solution is composed of organosiloxane, leveling agent, silicone resin, organic solvent and water, the coating solution is used on aluminum-plastic film At the same time, it is necessary to add coating equipment and modify the existing production equipment, which not only increases the operation steps, but also increases the production cost of aluminum-plastic film