Matt composite film with high heat sealability

A technology of composite film and aluminum-plastic composite film, which is applied in the direction of synthetic resin layered products, electronic equipment, applications, etc., can solve problems such as insufficient stamping performance, surface layer peeling, stress concentration at the interface of the composite layer, etc., and achieve improved heat sealing performance Effect on Chemical Resistance

Pending Publication Date: 2021-06-22
武汉欣宏创塑料印刷包装有限公司
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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 aluminum-plastic composite film, but the matte composite film with strong aluminum heat sealing performance at this stage has insufficient stamping and forming performance. After the battery is made, the heat sealing perf

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A matte composite film with strong heat-sealing performance, the aluminum-plastic composite film includes a plain foil layer, the matte surface on the plain foil layer has a protective layer, the protective layer adopts an improved metal surface treatment agent, and the There is a film on the protective layer, and the film and the protective layer are connected by a modified polyurethane adhesive;

[0018] There is a special protective layer on the other side of the plain foil layer. The special protective layer is made by reacting a surface film-forming agent. There is a multifunctional inner layer on the protective layer. The overall thickness of the aluminum-plastic film is is 113 μm. The composition by mass of the multifunctional inner layer is as follows: modified polypropylene pellets, adding a certain proportion of slippery agent, the slippery agent is a fluorine-based non-migrating slippery agent, polypropylene modified pellets and fluorine It is a non-migratin...

Embodiment 2

[0022] A matte composite film with strong heat-sealing performance, the aluminum-plastic composite film includes a plain foil layer, the matte surface on the plain foil layer has a protective layer, the protective layer adopts an improved metal surface treatment agent, and the There is a layer of film on the protective layer, and the film and the protective layer are connected by a modified polyurethane adhesive, and the film is made of polyamide film; the metal surface treatment agent is prepared from acid fluoride, oxidant, and deionized water. Form, acidic fluoride is ammonium bifluoride, oxide is hydrogen peroxide, and the mass ratio of preparation is ammonium bifluoride: hydrogen peroxide: deionized water=1.4:18:1000. The surface film-forming agent is a surface film-forming agent modified by a chelating agent and a penetrating agent, and the mass ratio of preparation is chelating agent: penetrating agent: surface film-forming agent=0.4:0.2:1000.

[0023] There is a specia...

Embodiment 3

[0025] A matte composite film with strong heat-sealing performance, the aluminum-plastic composite film includes a plain foil layer, the matte surface on the plain foil layer has a protective layer, the protective layer adopts an improved metal surface treatment agent, and the There is a film on the protective layer, and the film and the protective layer are connected by a modified polyurethane adhesive, and the film is selected from a polyamide film. The metal surface treatment agent is prepared from acid fluoride, oxidizing agent and deionized water, acid fluoride is ammonium bifluoride, oxide is hydrogen peroxide, and the mass ratio of preparation is ammonium bifluoride: hydrogen peroxide: deionized water= 1.4:18:1000. The surface film-forming agent is a surface film-forming agent modified by a chelating agent and a penetrating agent, and the mass ratio of preparation is chelating agent: penetrating agent: surface film-forming agent=0.3:0.2:1000.

[0026] There is a specia...

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Abstract

The invention belongs to the technical field of shell packaging, and particularly relates to a matte composite film with high heat sealability. The matte composite film comprises a plain foil layer, a protective layer is arranged on the matte surface of the plain foil layer, the protective layer is made of a metal surface treating agent, a film is arranged on the protective layer, and the film and the protective layer are connected through a modified polyurethane adhesive; a special protective layer is arranged on the bright surface of the plain foil layer, an improved surface film-forming agent is adopted in the special protective layer, a multifunctional inner layer is arranged on the protective layer, and the overall thickness of the aluminum-plastic film is 111-155 [mu]m. By manufacturing the special protective layer, corrosion of a low-molecular-weight strong solvent in the electrolyte can be blocked, and the composite strength of the inner layer is improved. And due to the use of the swelling-resistant modified polypropylene or polyethylene, the heat-sealed bonding structure does not have great structural change in a strong solvent soaking environment of electrolyte, so that the heat sealing performance and the chemical resistance of the heat-sealed bonding structure are improved.

Description

technical field [0001] The invention belongs to the technical field of packaging, in particular to a matte composite film with strong heat sealing performance. 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 aluminum-plastic composite film, but the matte composite film with strong aluminum heat sealing performance at this stage has insufficient stamping and forming performance. After the battery is made, the heat sealing performance drops significantly, and the surface The layer generates heat during the long-term charging and discharging of the matte composite film, which causes long-term stress concentration at the interface of the composite layer, which may cause the surface layer to fall off, ...

Claims

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Application Information

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IPC IPC(8): B32B15/20B32B15/088B32B15/09B32B15/04B32B27/34B32B27/36B32B27/32B32B27/06B32B7/12B32B3/30H01M50/105H01M50/126H01M50/131H01M10/052C08L23/12C08L23/06C08J5/18
CPCB32B3/30B32B7/12B32B15/04B32B15/088B32B15/09B32B15/20B32B27/06B32B27/32B32B27/34B32B27/36B32B2307/306B32B2307/714B32B2457/10C08J5/18C08J2323/06C08J2323/12H01M10/052Y02E60/10
Inventor 张和平袁宗喜
Owner 武汉欣宏创塑料印刷包装有限公司
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