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Epoxy adhesion for lithium battery flexible package and lithium battery flexible package material

An epoxy adhesive and flexible packaging technology, applied in the direction of adhesive types, non-polymer adhesive additives, packaging, etc., can solve the problems of separation of the inner layer and aluminum foil, low adhesion, and many layers, etc. , to achieve the effect of good heat sealing, high peel strength and high interlayer adhesion

Inactive Publication Date: 2012-10-03
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, the Chinese patent (application number 01134081.9) discloses a flexible packaging film for lithium batteries and its composite method. Since the inner layer adhesive resin is made of polyamide polymers, the electrolyte resistance is not good. It is easy to cause the inner layer to separate from the aluminum foil, which will cause the battery to be scrapped
Another example is a Chinese patent (application number 200410089189.2) disclosing a lithium battery flexible packaging film and its manufacturing method, wherein the aluminum-plastic composite film structure adopts base layer / dry compound adhesive layer / aluminum foil layer / chemical treatment layer / aluminum foil layer / chemical treatment layer The processing layer / adhesive resin layer / heat-sealing layer has a seven-layer structure, or even an eight-layer structure. The disadvantages of the above-mentioned lithium battery flexible packaging film are: too many layers, complex processing, high cost, and on the other hand, the bonding between layers The power is not high, which will affect the stability of the lithium battery

Method used

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  • Epoxy adhesion for lithium battery flexible package and lithium battery flexible package material
  • Epoxy adhesion for lithium battery flexible package and lithium battery flexible package material
  • Epoxy adhesion for lithium battery flexible package and lithium battery flexible package material

Examples

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Embodiment 1

[0036] Embodiment 1: The epoxy adhesive for lithium battery flexible packaging comprises: the bisphenol A type epoxy resin E-44 of 100 mass parts, the methyltetrahydrophthalic anhydride of 90 mass parts, the vinyl tetrahydrophthalic anhydride of 5 mass parts Triethoxysilane, 3 parts by mass of 2,4,6-tris(dimethylaminomethyl)phenol, 5 parts by mass of stearic acid, 50 parts by mass, titanium dioxide with a particle size of 1.5um, 20 parts by mass of ethyl acetate.

[0037] As shown in the figure, the lithium battery flexible packaging material adopts a six-layer aluminum-plastic composite film structure, which is the base layer 1, the outer adhesive layer 2, the aluminum foil layer 3, the conversion film layer 4, and the inner adhesive layer from top to bottom. Layer 5 and Heat Seal Layer 6.

[0038] The base layer 1 is made of nylon 6 with a thickness of 25um, the outer adhesive layer 2 is a two-component solvent-based polyurethane adhesive (UK3640 and UK6800, Henkel, Germany...

Embodiment 2

[0041] Embodiment 2: The epoxy adhesive for lithium battery flexible packaging comprises: the bisphenol A type epoxy resin E-44 of 100 mass parts, the methyl hexahydrophthalic anhydride of 90 mass parts, the vinyl of 4 mass parts Triethoxysilane, 3 parts by mass of 2,4,6-tris(dimethylaminomethyl)phenol, 5 parts by mass of oleic acid, and 20 parts by mass of glycidyl methacrylate.

[0042] As shown in the figure, the lithium battery flexible packaging material adopts a six-layer aluminum-plastic composite film structure, which is the base layer 1, the outer adhesive layer 2, the aluminum foil layer 3, the conversion film layer 4, and the inner adhesive layer from top to bottom. Layer 5 and Heat Seal Layer 6.

[0043] The base layer 1 is made of nylon 6 with a thickness of 25um, the outer adhesive layer 2 is a two-component solvent-based polyurethane adhesive (UK3640 and UK6800, Henkel, Germany) with a thickness of 5um, and the thickness of the aluminum foil layer 3 is 40um sof...

Embodiment 3

[0046] Embodiment 3: Epoxy adhesives for flexible packaging of lithium batteries include: 100 parts by mass of bisphenol A epoxy resin E-44, 10 parts by mass of hexahydropyridine, 3 parts by mass of glycidyloxypropyltrimethoxy Silane, 3 parts by mass of phthalate, 4 parts by mass of stearic acid, 50 parts by mass of titanium dioxide with a particle size of 1.5um, and 30 parts by mass of acetone.

[0047] As shown in the figure, the lithium battery flexible packaging material adopts a six-layer aluminum-plastic composite film structure, which is the base layer 1, the outer adhesive layer 2, the aluminum foil layer 3, the conversion film layer 4, and the inner adhesive layer from top to bottom. Layer 5 and Heat Seal Layer 6.

[0048] The base layer 1 is made of nylon 66 with a thickness of 25um, the outer adhesive layer 2 is a two-component solvent-based polyurethane adhesive (UK3640 and UK6800, Henkel, Germany) with a thickness of 8um, and the thickness of the aluminum foil lay...

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Abstract

The invention provides an epoxy adhesion for a lithium battery flexible package. The epoxy adhesion is mixed by bisphenol type epoxy resin, an amine or anhydride curing agent and an assistant at normal temperature according to certain proportion, and the epoxy adhesion, by weight, is composed of 100 parts of the epoxy resin, 10-100 parts of the curing agent, 1-5 parts of coupling agent, 0-10 parts of accelerating agent, 1-8 parts of plasticizer, 1-8 parts of fatty acid, 0-80 parts of padding and 0-90 parts of diluent. The epoxy adhesion further provides a lithium battery flexible package material which adopts a six-layer polyethylene-aluminum composite film structure, and the lithium battery flexible package material comprises an outer base layer, a middle aluminum foil layer an inner heat sealing layer. A polyurethane adhesion agent enables the base layer and the outer surface of the aluminum foil layer to be compounded, chromium phosphating is carried out on the inner surface of the aluminum foil layer, by means of high-strength composition of the epoxy resin adhesion agent and the heat sealing layer, peel strength between the aluminum foil layer and the heat sealing layer is high, separation performance and electrolyte resisting performance of the lithium battery flexible package material are improved, and a lithium battery has stability for long-time use.

Description

technical field [0001] The invention relates to an interlayer adhesive and a secondary battery inner packaging material, in particular to an epoxy adhesive for lithium battery flexible packaging and lithium battery flexible packaging material. Background technique [0002] Lithium batteries, namely lithium-ion secondary batteries, are widely used in digital products such as mobile phones, notebook computers, cameras, and other electronic devices such as new energy electric vehicles due to their light weight, large capacity, long cycle life, and no memory effect. and device. At present, lithium batteries are in a stage of continuous improvement in performance, continuous reduction in cost, rapid expansion of application fields, and a sharp increase in market share. If the safety and overall performance of lithium batteries cannot keep up with the rapid growth trend, it will inevitably restrict the development of the industry. [0003] Lithium battery flexible packaging mate...

Claims

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Application Information

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IPC IPC(8): C09J163/02C09J11/04C09J11/06B65D65/40B65D85/88B32B7/12B32B15/088B32B9/04B32B27/32
CPCY02E60/12Y02E60/10
Inventor 徐世爱夏飞梁昌盛金国呈姚俊琦
Owner EAST CHINA UNIV OF SCI & TECH
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