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Modified CPP thin film used for lithium battery flexible packaging film

A flexible packaging film, lithium battery technology, applied in packaging, wrapping paper, transportation and packaging, etc., can solve the problems of corrosion resistance, puncture resistance, outer layer material corrosion, battery scrapping and other problems of lithium batteries without packaging, and achieve excellent high temperature resistance. Performance and mechanical properties, improve performance, enhance the effect of acid and alkali resistance

Active Publication Date: 2020-01-17
JIESHOU CITY TIANHONG PACKAGING MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, there are burrs on the copper mesh and aluminum mesh around the lithium-ion battery core. During the vacuuming operation of the package, the soft packaging film shrinks, and the burrs will puncture the inner membrane. If the inner membrane is pierced, the hydrofluoric acid in the cell will It will corrode the outer material and cause the battery to be scrapped. Therefore, the flexible packaging film needs to have good puncture resistance, but ordinary CPP film does not have the corrosion resistance and puncture resistance required for packaging lithium batteries.

Method used

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  • Modified CPP thin film used for lithium battery flexible packaging film
  • Modified CPP thin film used for lithium battery flexible packaging film
  • Modified CPP thin film used for lithium battery flexible packaging film

Examples

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Effect test

Embodiment 1

[0039] A modified CPP film for lithium battery flexible packaging film, which consists of three thin resin layers, layer A, layer B, and layer C in sequence from bottom to top, and the weight percentage of the three layers of A, B, and C is 15%, 70%, 15%.

[0040] Layer A is composed of 90% by weight of terpolymerized polypropylene, 5% of crosslinking monomer, 0.2% of initiator, and 4.8% of graphene;

[0041] Layer B consists of 90% homopolypropylene, 5% cross-linking monomer, 0.2% initiator, 1% phenolic epoxy vinyl ester resin, 3.8% graphene, phenolic epoxy vinyl ester resin and phenolic resin , epichlorohydrin, and methoxyacrylic acid as raw materials;

[0042] C layer composition by weight percentage: mixed polypropylene 90%, crosslinking monomer 5%, initiator 0.2%, graphene 4.8%, mixed polypropylene is composed of 20% ternary polypropylene and 80% homopolypropylene in mass percentage .

[0043] The preparation method of modified CPP film is as follows:

[0044] S1: A, B,...

Embodiment 2

[0058] A modified CPP film for lithium battery flexible packaging film, which consists of three thin resin layers, layer A, layer B, and layer C from bottom to top, and the weight percentage of the three layers of A, B, and C is 20%, 60%, 20%.

[0059] The weight percentage composition of layer A: terpolymerized polypropylene 87%, crosslinking monomer 8%, initiator 0.5%, graphene 4.5%;

[0060] Layer B consists of 85% homopolypropylene, 8% cross-linking monomer, 0.5% initiator, 3% novolak epoxy vinyl ester resin, 3.5% graphene, novolac epoxy vinyl ester resin and phenolic resin , epichlorohydrin, and methoxyacrylic acid as raw materials;

[0061] C layer composition by weight: mixed polypropylene 87%, cross-linking monomer 8%, initiator 0.5%, graphene 4.5%, mixed polypropylene is 10% binary polypropylene by mass percentage, 20% ternary polypropylene and Composed of 70% homopolypropylene.

[0062] The preparation method of the modified CPP film is consistent with that of Exa...

Embodiment 3

[0069] A modified CPP film for lithium battery flexible packaging film, which consists of three thin resin layers, layer A, layer B, and layer C in sequence from bottom to top, and the weight percentage of the three layers of A, B, and C is 15%, 70%, 15%.

[0070] The weight percentage composition of layer A: terpolymerized polypropylene 84%, crosslinking monomer 10%, initiator 1%, graphene 5%;

[0071] Layer B consists of 79% homopolypropylene, 10% cross-linking monomer, 1% initiator, 5% novolak epoxy vinyl ester resin, 5% graphene, novolac epoxy vinyl ester resin and phenolic resin , epichlorohydrin, and methoxyacrylic acid as raw materials;

[0072] The weight percent composition of layer C: mixed polypropylene 84%, cross-linking monomer 10%, initiator 1%, graphene 5%. The mixed polypropylene is composed of 20% binary polypropylene, 40% ternary polypropylene and 40% homopolypropylene in mass percent.

[0073] The preparation method of the modified CPP film is consistent ...

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Abstract

The invention discloses a modified CPP thin film used for a lithium battery flexible packaging film. The thin film is made through three-layer co-extrusion, flow coating roller cooling shaping, automatic thickness measuring adjusting, corona processing, side cutting winding and slitting operation. Ternary polymerization polypropylene, homo-polypropylene and mixed polypropylene serve as base materials, a crosslinking monomer and an initiating agent are added into all layers of polypropylene, an extruding machine is used for enabling the polypropylene to have a mico-crosslinking reaction with the crosslinking monomer and the initiating agent, through the method, the thin film can effectively improve corrosion resistance, composite tightness between film layers can be improved, through addingof novolac epoxy vinyl ester resin, corrosion resistance can reach the degree of lithium battery electrolyte resisting, graphene is added, reduction of composite system strength due to adding of thecrosslinking monomer and the novolac epoxy vinyl ester resin can be relieved, and the requirements of the CPP film for a lithium battery to puncture resistance and impact resistance can be effectivelyachieved.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to a modified CPP film used for lithium battery flexible packaging films. Background technique [0002] CPP film is cast polypropylene film, which is a polypropylene film produced by casting process. According to different uses, it can be divided into general CPP film, aluminized grade CPP film and cooking grade CPP film, etc. Due to the advantages of good transparency, high gloss, strong moisture resistance, high heat resistance, and easy heat sealing, it is widely used in the market, especially for food packaging. [0003] In recent years, with the development of the microelectronics industry, CPP films have begun to be used in the inner layer of flexible packaging for lithium-ion batteries. The electrolyte of lithium batteries contains a variety of organic solvents. Organic solvents usually swell, dissolve, and absorb flexible packaging materials, especially the inner layer mate...

Claims

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Application Information

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IPC IPC(8): B65D65/40B65H18/10B65H18/02C08L23/14C08L23/12C08L63/10C08K3/04C08J5/18B29C48/08B29C48/21B29C48/00B29C69/00B29L7/00
CPCB29C69/001B29L2007/00B65D65/40B65H18/028B65H18/10B65H2701/1944B29C48/0022B29C48/08B29C48/21C08J5/18C08J2323/12C08J2323/14C08J2463/10C08K3/042
Inventor 胡伟李汪洋吴磊周正发任凤梅张伟孙晓华徐凤锦刘志强王若愚张德顺郭浩
Owner JIESHOU CITY TIANHONG PACKAGING MATERIAL
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