High-barrier layer flexible packaging film for isolating contents of polymer lithium battery

Abstract

The invention provides a high-barrier layer flexible packaging film for isolating contents of a polymer lithium battery. The high-barrier layer flexible packaging film comprises at least two kinds of films which are combined to form a layer of composite film, wherein the composite film comprises a basic layer, a functional layer and a heat sealing layer; the high-barrier layer flexible packaging film is characterized in that: the basic layer is a copolymer film prepared by combining at least two film base materials of PP (polypropylene), CPP (chlorinated polypropylene or casting polypropylene), PE (polyethylene), PET (poly(ethylene terephthalate)), PA (polyamide) or MXD6 (aromatic polyimide), MPE (elastomer blend), PVDC (polyvinyl dichloride), EVOH (ethylene-vinyl alcohol), PEN (polyethylene naphthalate) and GT, or by complexing pairwise; and a high-barrier water-tolerant modified PVA (poly vinyl alcohol) coating film is coated on the copolymer film base materials. The high-barrier layer flexible packaging film has excellent gas barrier property, remarkably low oxygen permeability, water resistance, corrosion resistance, good high temperature resistance and great barrier property, and resists organic solvents and highly-volatile substances. In the invention, the high-barrier PVA is preferably coated on various base materials to obtain a base layer serving as a high-barrier layer which has great barrier property and excellent performance in resisting gas, water, corrosion, ultraviolet rays and the like.

Description

Technical field

[0001] The invention relates to a high-barrier flexible packaging film which is mainly used for gas-barrier, water-barrier, and oil-barrier high-permeability composite packaging, especially for barrier polymer lithium battery content-electrolyte. Internationally, the oxygen transmission rate will be less than 3.8Cm 3 .mm / 24b.m 2 .MPa polymers are called barrier polymers. High barrier standard for high barrier packaging materials: O 2 The penetration rate is 5ml / m 2 , Below d, moisture permeability is 2g / m 2 , Below d. Background technique

[0002] Usually used to block the contents of polymer lithium batteries, if the adhesive layer is not included, it is mainly a multi-layer co-extruded composite film composed of an outer layer, a barrier layer (aluminum foil in the middle) and a high barrier layer (inner layer) . At present, the production of multi-layer composite films at home and abroad usually adopts the method of combining plastic films with different func...