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A kind of modified cpp film for lithium battery flexible packaging film

A technology of flexible packaging film and lithium battery, which is applied in packaging, packaging paper, transportation and packaging, etc. It can solve the problems of battery scrapping, corrosion of outer layer materials, corrosion resistance and puncture resistance of lithium batteries without packaging, and achieve enhanced acid resistance Effects of alkalinity, performance improvement, excellent high temperature resistance and mechanical properties

Active Publication Date: 2021-10-08
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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  • A kind of modified cpp film for lithium battery flexible packaging film
  • A kind of modified cpp film for lithium battery flexible packaging film
  • A kind of modified cpp film for lithium battery flexible packaging film

Examples

Experimental program
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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%, cross-linking 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 film for lithium battery flexible packaging film, which is obtained through three-layer co-extrusion, casting roll cooling and shaping, automatic thickness measurement and adjustment, corona treatment, edge trimming and winding, and slitting operations; The present invention takes ternary copolymerized polypropylene, homopolymerized polypropylene and mixed polypropylene as the base material, adds crosslinking monomer and initiator into each layer of polypropylene, and utilizes an extruder to make polypropylene, crosslinking monomer, and initiator The micro-crosslinking reaction of the agent occurs, and the film prepared by this method can effectively improve the corrosion resistance and enhance the composite tightness between the film layers; by adding novolac epoxy vinyl ester resin, the corrosion resistance can reach the level of resistance to lithium battery electrolysis The degree of liquid, and by adding graphene, slowed down the reduction of the strength of the composite system caused by the addition of cross-linking monomers and novolac epoxy vinyl ester resins, and effectively realized the puncture resistance and impact resistance of the CPP film for lithium batteries. Require.

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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Patent Type & Authority Patents(China)
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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