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Preparation method for aluminum-plastic composite film

A technology of aluminum-plastic composite film and aluminum foil layer, which is applied in the direction of chemical instruments and methods, synthetic resin layered products, lamination, etc., can solve problems such as insufficient stamping performance, safety risks, and reduced heat-sealing performance, and achieve improvement Effects of heat sealing performance and chemical resistance, optimization of bonding interface, and improvement of composite strength

Active Publication Date: 2018-09-04
CHANGZHOU SVECK PHOTOVOLTAIC NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the main material for the packaging of soft-pack lithium power batteries is to use aluminum-plastic composite film, but the current aluminum-plastic composite film has insufficient stamping performance. Heat is generated during discharge, causing long-term stress concentration at the interface of the composite layer, which may cause the surface layer to fall off, posing a certain safety risk

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Unwind the aluminum foil raw material with a thickness of 40 μm and wash it in the prepared alkaline degreasing and degreasing metal cleaning agent (Henkel ParcoCleaner 338 L) solution, the cleaning temperature is 50 ℃, the cleaning time is 40s, and then dried; the selected The swelling-resistant modified polypropylene pellets are mixed with fluorine-based slip agent, the mixing mass ratio is 25:1, and the mixing time is 10 minutes; the surface treatment agent is coated on the matte surface of the aluminum foil layer (Ningbo Jianghaiqing Environmental Protection Engineering Co., Ltd. BL-103), then react in an infrared oven, the reaction temperature is 120°C, the reaction time is 40s, and then air-dried and cooled to prepare the treated layer; the bright surface of the treated aluminum foil layer is coated with a surface film-forming agent for surface Film-forming treatment, and then dry at 90°C to make a special protective layer; mix dry-reusable polyurethane adhesive, t...

Embodiment 2

[0028] Unwind the aluminum foil raw material with a thickness of 40 μm and wash it in the prepared alkaline degreasing and degreasing metal cleaning agent (Henkel ParcoCleaner 338 L), the cleaning temperature is 50 ℃, the cleaning time is 40s, and then dried; Swelling modified polypropylene pellets are mixed with fluorine-based slip agent, the mixing mass ratio is 100:4, and the mixing time is 10 minutes; the surface treatment agent (Henkel Bonderite M-NT-20121) is coated on the matte surface of the aluminum foil layer ), and then react in an infrared oven, the reaction temperature is 120°C, the reaction time is 40s, and then air-dried and cooled to make a treated layer; the bright surface of the treated aluminum foil is coated with a surface film-forming agent (Ningbo Jianghaiqing Environmental Protection Engineering Co., Ltd. Co., Ltd. BL-103) for surface film-forming treatment, and then dried at 90°C to make a special protective layer; mixed dry-reusable polyurethane adhesiv...

Embodiment 3

[0030] Unwind the aluminum foil raw material with a thickness of 40 μm and wash it in the prepared alkaline degreasing and degreasing metal cleaning agent (Henkel ParcoCleaner 338 L), the cleaning temperature is 50 ℃, the cleaning time is 40s, and then dried; Swelling modified polypropylene pellets are mixed with silane-based slip agent, the mixing mass ratio is 100:4, and the mixing time is 10 minutes; the surface treatment agent is coated on the matte surface of the aluminum foil layer, and then reacted in an infrared oven. The temperature is 120°C, the reaction time is 40s, and then air-dried and cooled to prepare the treatment layer; the surface film-forming agent (Ningbo Jianghaiqing Environmental Protection Engineering Co., Ltd. BL-103) is coated on the bright side of the treated aluminum foil for surface film formation treatment, and then dried at 90°C to make a special protective layer; mix dry-reusable polyurethane adhesive, the mass ratio of main agent, curing agent, ...

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Abstract

The invention belongs to the technical field of packaging of power lithium battery shells, and specifically provides a preparation method for an aluminum-plastic composite film. The preparation methodcomprises the following steps: preparation of a treatment layer: a step of cleaning the surface of an aluminum foil, carrying out drying, coating a surface treating agent onto the matte surface of the aluminum foil, carrying out a reaction under heating, and carrying out drying; coating a surface film-forming agent onto the other surface of the aluminum foil, and carrying out heating and drying so as to form a special protective layer; coating a polyurethane adhesive onto the treatment layer of the aluminum foil, then carrying out compounding with a film, and carrying out curing; selecting aswelling-resistant polypropylene or polyethylene modified particle material, adding a slipping agent in a certain proportion, carrying out full mixing, then adding an obtained mixture into a feed hopper of a screw extruder, and carrying out extrusion, wherein a thickness is controlled by control of the amount of extrusion and the rate of production, and an extruding and compounding process is adopted; and spraying an obtained material in a molten state onto the surface of the special protective layer of a cured aluminum-plastic composite film semi-finished product so as to complete a manufacturing process. The preparation method provided by the invention has the following effects: the disadvantage of insufficient impact molding performance of the aluminum-plastic composite film is solved;the chemical resistance of the aluminum-plastic composite film is greatly reinforced; and an outer protective layer has improved bonding effect and can bear strong stress concentration.

Description

technical field [0001] The invention belongs to the technical field of casing packaging of power lithium batteries, in particular to a method for preparing an aluminum-plastic composite film. Background technique [0002] With the development of the new energy industry, especially the market demand for large-capacity energy storage and high-power discharge is gradually increasing. Become one of the mainstream needs of the market. At present, the main material for the packaging of soft-pack lithium power batteries is to use aluminum-plastic composite film, but the current aluminum-plastic composite film has insufficient stamping performance. Heat is generated during discharge, causing long-term stress concentration at the interface of the composite layer, which may cause the surface layer to fall off, posing a certain safety risk. Therefore, an aluminum-plastic composite film is specially designed for soft-pack lithium power batteries, and a manufacturing process is designe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/32B32B7/12B32B27/08B32B27/34B32B27/36B32B15/20B32B33/00B32B37/12B32B37/15
CPCB32B7/12B32B15/20B32B27/08B32B27/32B32B27/34B32B27/36B32B33/00B32B37/1284B32B37/153B32B2307/714
Inventor 单化众吕松梁俊杰
Owner CHANGZHOU SVECK PHOTOVOLTAIC NEW MATERIAL
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