Three-layer composite micropore diaphragm and preparation method therefor

A technology of microporous diaphragm and layer compounding, applied in the direction of electrical components, circuits, battery pack components, etc., can solve the problems of a large amount of waste liquid, waste gas, complex production process, poor mechanical properties, etc., achieve good high temperature resistance, simplify Effect of production equipment and process, high membrane rupture temperature

Inactive Publication Date: 2018-01-23
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The biggest disadvantage of this production process is that the production process requires a large amount of solvent, produces a large amount of waste liquid and waste gas, has certain pollution, and the preparation cost is also high
[0006] The preparation of microporous membranes by thermal phase separation inevitably uses a large amount of diluents and extractants, which also brings environmental and safety issues. The poly-4-methyl-1-pentene microporous membranes prepared by this method are Isotropic, non-oriented, the mechanical properties of the film are poor, and the production process of this method is relatively complicated and the production cost is high

Method used

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  • Three-layer composite micropore diaphragm and preparation method therefor
  • Three-layer composite micropore diaphragm and preparation method therefor

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Experimental program
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Effect test

Embodiment 1

[0037] Add poly-4-methyl-1-pentene with a melt index of 6g / 10min and polypropylene with a melt index of 1g / 10min into different extruders, co-extrude through a multi-layer die, and cast to obtain a three-layer poly-4 - Methyl-1-pentene / polypropylene initial cast film. The temperature of the multi-layer die is 290°C, the casting temperature is 80°C, and the thickness of the casting film is 25um. Heat treatment at 145°C for 0.3h. Direct thermal stretching at 110°C, stretching rate 5mm / min, stretching ratio 100%, heat setting temperature 125°C, heat setting time 25min, to obtain three layers of poly-4-methyl-1-pentene / polypropylene micropores membrane.

[0038] The specific preparation flow chart is as figure 1 shown.

Embodiment 2

[0040] Add poly-4-methyl-1-pentene with a melt index of 32g / 10min and polypropylene with a melt index of 6g / 10min into different extruders, co-extrude through a multi-layer die, and cast to obtain a three-layer poly-4 - Methyl-1-pentene / polypropylene initial cast film. The temperature of the multi-layer die is 250°C, the casting temperature is 80°C, and the thickness of the casting film is 25um. Heat treatment at 145°C for 0.3h. Direct thermal stretching at 110°C with a stretching rate of 5 mm / min. The stretch ratio is 100%, the heat setting temperature is 125° C., and the heat setting time is 25 minutes to obtain a three-layer poly-4-methyl-1-pentene / polypropylene microporous membrane.

Embodiment 3

[0042]Add poly-4-methyl-1-pentene with a melt index of 18g / 10min and polypropylene with a melt index of 2.7g / 10min into different extruders, co-extrude through a multi-layer die, and cast to obtain a three-layer polystyrene. 4-Methyl-1-pentene / polypropylene initial cast film. The temperature of the multilayer die is 275°C, the casting temperature is 80°C, and the thickness of the casting film is 25um. Heat treatment at 145°C for 0.3h. Direct thermal stretching at 110°C, stretching rate 5mm / min, stretching ratio 100%, heat setting temperature 125°C, heat setting time 25min, to obtain three layers of poly-4-methyl-1-pentene / polypropylene micropores membrane.

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Abstract

The invention provides a preparation method for a three-layer composite micropore diaphragm. The preparation method comprises the following steps of A), performing extrusion of poly 4-methyl-1-amyleneand polypropylene in a melting manner through three extrusion film casting machines separately, and performing multilayered opening die film casting to obtain a multilayered composite cast film, wherein 4-methyl-1-amylene is positioned on the outer layer while polypropylene is positioned in the middle layer; B), performing thermal treatment on the multilayered composite cast film at a temperatureof 145 DEG C for 0.3h to obtain a multilayered thermal treatment film; C), performing thermal stretching on the multilayered thermal treatment film at a temperature of 110-150 DEG C at the stretchingratio of 100-170% to obtain a thermal treatment film with a micropore structure; and D) performing shaping on the micropore film obtained in the step C) at a temperature of 125-150 DEG C for 5-25minto obtain the three-layer composite micropore diaphragm. According to the preparation method, any pore-forming agent and solvent, and a cold stretching process are not needed, the process is simple, and the prepared porous film has excellent high temperature resistance.

Description

technical field [0001] The invention relates to the technical field of isolation membrane production, in particular to a three-layer composite microporous membrane and a preparation method thereof. Background technique [0002] The separator is the core component of the lithium-ion battery, accounting for about 18%-30% of the cost of the entire lithium battery. The quality of its performance plays a vital role in the overall performance of lithium batteries, and it is also one of the key technologies restricting the development of lithium batteries. With the development of electronic products and the expansion of application fields, people's requirements for the performance of lithium batteries are also getting higher and higher. In order to meet the development requirements of lithium batteries, the separator should have high mechanical strength, excellent thermal stability, good micropore distribution and low manufacturing cost. [0003] At present, lithium-ion battery s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16B29C69/00B29C47/06B29C47/00B29C55/02H01M50/403H01M50/411H01M50/457H01M50/491
CPCY02E60/10
Inventor 谢嘉宜苏植祥徐睿杰雷彩红
Owner GUANGDONG UNIV OF TECH
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