A kind of PBT aluminum-plastic composite film and its production process

Abstract

The invention discloses a PBT aluminum-plastic composite film, which comprises a middle layer, an inner layer arranged on the inner side of the middle layer and an outer layer arranged on the outer side of the middle layer, wherein the middle layer and the inner layer are bonded by a first adhesive layer, the middle layer and the outer layer are bonded by a second adhesive layer, the middle layeris an aluminum foil layer, the inner layer is a polyolefin layer, the outer layer is formed by a blend formed by blending poly 1,4-naphthalic acid 3-(trimethylsilyl)-1,2-propylene glycol ester and a PBT resin according to a weight part ratio of 1:(5-8), and the first adhesive layer and the second adhesive layer are respectively and independently formed by an aluminum-doped hyperbranched polyurethane acrylate adhesive. The invention further discloses a production process of the PBT aluminum-plastic composite film. The PBT aluminum-plastic composite film disclosed by the invention has the advantages of high-temperature resistance, corrosion resistance, scratch resistance, good performance stability, excellent comprehensive performance, good mechanical properties and good water vapor barrierproperty, and can significantly improve the thermal resistance and the safety performance of a lithium ion battery.

Description

technical field [0001] The invention relates to the technical field of packaging materials, in particular to a PBT aluminum-plastic composite film and a production process thereof. Background technique [0002] In recent years, with the rapid development of portable electronic products, electric vehicles, and energy storage power stations, lithium-ion batteries have become the preferred chemical power source due to their advantages such as high energy density, high operating voltage, small self-discharge, and long cycle life. With the further expansion of the application range, people are paying more and more attention to the normal working stability and safety of lithium-ion batteries, and higher requirements are placed on the performance of aluminum-plastic films used for lithium-ion battery packaging. [0003] Aluminum-plastic film is the core material of lithium-ion batteries and belongs to the field of precision manufacturing. It has high stability to liquid chemical su...

AI Technical Summary

Problems solved by technology

The PA film is not resistant to the electrolyte used in lithium batteries. During the production of lithium batteries, the electrolyte is easy to pollute the surface and cause the battery to be scrapped.

PET film has low strength and poor flexibility, and the produced aluminum-plastic film has poor drawing performance

[0006] The Chinese invention patent with the application number 201710813207.4 discloses a surface electrolyte-resistant aluminum-plastic film and its manufacturing method. Using PBT material as the outer layer, the obtained aluminum-plastic film has high strength, good electrolyte resistance, and good deep-drawing performance. However, , PBT film has the defects of low notched impact strength and large molding shrinkage rate, the electrolyte resistance of the adhesive layer used needs to be further improved, and there are quality problems such as delamination of aluminum-plastic film