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Preparation method of polypropylene film layer for reducing cracks in cold punching process

A polypropylene film, polypropylene technology, applied in the directions of graft polymer adhesives, adhesive types, adhesive additives, etc., can solve the problem of poor stress crack resistance, reduced elongation at break, and impact on product use. and other problems, to achieve the effect of improving adhesion, improving high toughness, and preventing stress whitening

Pending Publication Date: 2021-02-05
GUANGDONG ANDELI NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The stress whitening of the product not only affects its appearance, but also leads to a decrease in the elongation at break, a decrease in strength, and a deterioration in stress cracking resistance of the product, which seriously affects the use of the product

Method used

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  • Preparation method of polypropylene film layer for reducing cracks in cold punching process

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The present embodiment provides a kind of preparation method of the polypropylene film layer that reduces crack in the cold stamping process, specifically comprises the following steps:

[0037] S1, the preparation of maleic anhydride modified polypropylene:

[0038] The mixture of polypropylene and maleic anhydride is fed into the twin-screw extruder, and after it is melted, the styrene solution containing viscosity modifier and diethylpropylbenzene peroxide is continuously metered in different screw barrel sections of the twin-screw extruder Input, the temperature is 180°C, the rotation speed is 100rpm, and the melt grafting reaction is carried out to finally obtain the maleic anhydride modified polypropylene; and polypropylene, maleic anhydride, viscosity modifier, diethylpropylbenzene peroxide, styrene The mass ratio is 100:10:1:1:10.

[0039] S2, the preparation of lubricant:

[0040] Mix hydroxyethyl bis fatty acid amide and bis stearamide evenly, dry at 70°C for ...

Embodiment 2

[0046] The present embodiment provides a kind of preparation method of the polypropylene film layer that reduces crack in the cold stamping process, specifically comprises the following steps:

[0047] S1, the preparation of maleic anhydride modified polypropylene:

[0048] The mixture of polypropylene and maleic anhydride is fed into the twin-screw extruder, and after it is melted, the styrene solution containing viscosity modifier and tert-butyl peroxyacetate is continuously metered in different screw barrel sections of the twin-screw extruder Input, the temperature is 210°C, the rotation speed is 90rpm, and the melt grafting reaction is carried out to finally obtain the maleic anhydride-modified polypropylene; and polypropylene, maleic anhydride, viscosity modifier, tert-butyl peroxyacetate, styrene The mass ratio is: 90:10:1:0.5:10.

[0049] S2, the preparation of lubricant:

[0050] Mix hydroxyethyl bis fatty acid amide and bis stearamide evenly, dry at 60°C for 6 hours...

Embodiment 3

[0056] The present embodiment provides a kind of preparation method of the polypropylene film layer that reduces crack in the cold stamping process, specifically comprises the following steps:

[0057] S1, the preparation of maleic anhydride modified polypropylene:

[0058] The mixture of polypropylene and maleic anhydride is fed into the twin-screw extruder, and after it is melted, the styrene solution containing viscosity modifier and dicumyl peroxide is continuously metered in different screw barrel sections of the twin-screw extruder Input, the temperature is 200°C, the rotation speed is 80rpm, and the melt grafting reaction is carried out to finally obtain the maleic anhydride modified polypropylene; and polypropylene, maleic anhydride, viscosity modifier, dicumyl peroxide, styrene The mass ratio is: 95:8:0.7:0.7:15.

[0059] S2, the preparation of lubricant:

[0060] Mix hydroxyethyl bis fatty acid amide and bis stearamide evenly, dry at 65°C for 7 hours, then fully mi...

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Abstract

The invention discloses a preparation method of a polypropylene film layer for reducing cracks in a cold punching process. The preparation method specifically comprises the following steps: (1) respectively and uniformly mixing components contained in a bonding layer, a core layer and a heat sealing layer, and respectively carrying out melting and plasticizing in three extruders to respectively obtain melts of the bonding layer, the core layer and the heat sealing layer; and (2) carrying out three-layer co-extrusion through three extrusion heads of the melt extruder, and enabling materials tobe subjected to casting to a cooling roller to be cooled to form a film comprising the bonding layer, the core layer and the heat sealing layer in sequence. The polypropylene film layer prepared fromthe raw materials according to the ratio is good in mechanical property, has the characteristics of being easy to process and form and the like, particularly, the stress whitening resistance of the material is controlled, and the polypropylene film layer can be used in occasions in which various products requiring materials to keep the appearance under the condition of multiple external forces areformed, and can be used in the field of products with various colors and other modified purposes.

Description

technical field [0001] The present invention relates to the technical field of aluminum-plastic film production, more specifically to a method for preparing a polypropylene film that reduces cracks in a cold stamping process. Background technique [0002] Lithium-ion secondary batteries are widely used as power sources for notebook computers, video cameras, mobile phones, electric vehicles, and the like. As this lithium ion secondary battery, the structure in which the periphery of the battery body is protected by the case is called a packaging material for the case. Lithium-ion soft-pack batteries need to be heat-sealed and packaged with aluminum-plastic composite film. Packaging is an indispensable and important part for it. Lithium batteries cannot exist independently without packaging. The service life of packaging is the same as that of lithium batteries. Service life has the same life cycle. Aluminum-plastic composite film packaging materials must have good heat-seal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C48/08B29C48/21C09J123/14C09J151/08C09J11/08C08J5/18C08L23/12C08L23/08C08L23/14C08K3/34C08F255/02C08F222/06C08F212/08
CPCB29C48/08B29C48/21C09J123/14C09J11/08C08J5/18C08F255/02C08J2323/12C08J2423/08C08J2323/14C08K3/34C08L51/08C08F222/06C08F212/08
Inventor 王桂彬陈汉城林杰生熊泽民
Owner GUANGDONG ANDELI NEW MATERIALS CO LTD
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