High sealing flexible composite film material for cold punching molding and its manufacturing method

Abstract

The invention provides a high sealing flexible composite film material for cold punching molding. The composite film material comprises: a thermoplastic resin film inner layer, an aluminum foil metal core layer, and a heat resistant film outer layer. Specifically, the aluminum foil metal core layer is positioned between the thermoplastic resin film inner layer and the heat resistant film outer layer. The thermoplastic resin film inner layer is a multi-layer coextrusion layer containing at least two resin layers. The multi-layer coextrusion layer at least includes a surface heat seal layer and an inner composite layer, and the inner composite layer contacts the aluminum foil metal core layer. The surface heat seal layer contains a non-migrating inorganic additive with lubrication. The upper and lower surfaces of the aluminum foil metal core layer both undergo surface pretreatment. By adding the non-migrating inorganic additive with lubrication to the surface heat seal layer, the bonding problem caused by clinging of a composite material surface and a die can be prevented, and at the same time, air can permeate into the space between the composite material and the die along the gaps between tiny protuberances, so that the whole composite material is easy to undergo cold punching molding and die release. The invention also provides a preparation method of the flexible composite film material.

Description

technical field [0001] The invention relates to a high-seal flexible composite film material for cold stamping and its corresponding manufacturing method, in particular to a film suitable for electronics with high formability, sealing performance, barrier performance and chemical corrosion resistance in post-processing applications. A flexible composite film material for packaging parts or medical supplies, photographic medicines, and other items containing strong corrosive organic solvents. Background technique [0002] Since the industrialization of lithium-ion batteries in the early 1990s, they have been widely used in civilian fields, such as small-capacity lithium-ion secondary batteries used in mobile phones, handheld computers, notebook computers, video cameras, and digital cameras. With the development of lithium-ion battery technology, its application fields have gradually expanded to large-capacity lithium-ion batteries in the fields of electric vehicles, aerospace...

AI Technical Summary

Problems solved by technology

[0008] However, for some electronic components or pharmaceuticals, photographic medicines, etc. that have high requirements for cleanliness, barrier properties, and sealing properties, packaging materials that contain migratory lubricants such as fatty acid amide series may not be suitable, even for a small amount. The precipitation of the lubricant will also pollute the contents of the package. The precipitation of the lubricant will also affect the bonding performance of the composite surface of the material, increase the possibility of material separation, affect the barrier properties of the packaging material, and even cause Poor sealing performance caused by too smooth packaging surface, followed by the infiltration of water vapor and oxygen, resulting in the failure of the packaged content

[0009] At the same time, although the aluminum foil is oxidized with chromate, the treatment process is simple, the cost is low, the chemical conversion treatment layer has a certain corrosion resistance and has a good bonding force with the resin film, but the hexavalent chromium often contained in chromate is carcinogenic and harmful. Toxicity, the aerosol generated during the oxidation process and the waste water in the production have serious harm to organisms and the environment, and its application has been gradually restricted. The European Union has implemented the poisonous and harmful The Restriction of Substances Directive (RoSH) clearly limits the content of hexavalent chromium in products

[0010] The flexible packaging materials for electronic components in the prior art, especially the packaging materials for lithium-ion secondary batteries or capacitors, still have long-term interlayer separation in the molding production and assembly process, electrolyte leakage caused by poor sealing, and improper molding. The technical problems of shell damage and low processing yield

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