Method for preparing multiple layers of polyolefin microporous film

A technology of polyolefin microporous membrane and polyolefin resin, applied in chemical instruments and methods, layered products, synthetic resin layered products, etc., can solve the problem of high membrane rupture temperature, low closed cell temperature, and difficulties in meeting new requirements and other issues to achieve high-strength effects

Active Publication Date: 2011-08-17
康辉南通新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In recent years, with the increasing shortage of traditional energy sources in the world, more and more devices have begun to use lithium batteries. Especially in recent years, the development of electric vehicles has put forward higher requirements for the performance of lit...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Put 20wt% of high-density polyethylene into a twin-screw extruder (78mm in diameter, L / D=48, strong mixing type), add 80wt% of liquid paraffin through the side feeding port with a metering pump, and heat at 200°C The conditions were melted and kneaded to prepare a polyethylene solution, and the obtained solution was extruded from the core layer of the three-layer die through a metering pump, with a thickness of 150 μm, and the heating temperature of the die was 200°C.

[0024] Add 40wt% of polypropylene into another twin-screw extruder (78mm in diameter, L / D=48, strong mixing type), and add 60wt% of mixed oil (paraffin oil) through the side feeding port with a metering pump :undecane:methyl benzoate=10:2:1), melted and kneaded at 200°C to make a polyethylene solution, and the obtained solution was extruded from the two surface layers of the three-layer die through a metering pump, each The thickness of the layer was 260 μm, and the die heating temperature was 200° C...

Embodiment 2

[0027] Put 20wt% of high-density polyethylene into a twin-screw extruder (78mm in diameter, L / D=48, strong mixing type), add 80wt% of liquid paraffin through the side feeding port with a metering pump, and heat at 220°C , 150 rev / min condition melt kneading to prepare polyethylene solution, the obtained solution is extruded from the core layer of the three-layer die head through a metering pump, the thickness is 150 μm, and the die head heating temperature is 200°C.

[0028] Add 15wt% of 1-butene into another twin-screw extruder (78mm in diameter, L / D=48, strong mixing type), and add 85wt% of mixed oil through the side feeding port with a metering pump (paraffin oil: decane: methyl benzoate = 10:3:1), melted and kneaded at 210 ° C to prepare a polyethylene solution, and the obtained solution was extruded from the two surface layers of the three-layer die through a metering pump , the thickness of each layer is 300μm, and the die heating temperature is 200°C.

[0029] Af...

Embodiment 3

[0031] Put 40wt% of high-density polyethylene into a twin-screw extruder (78mm in diameter, L / D=48, strong mixing type), add 60wt% of liquid paraffin through the side feed port with a metering pump, and heat at 220°C The conditions were melted and kneaded to prepare a polyethylene solution, and the obtained solution was extruded from the core layer of the three-layer die through a metering pump, with a thickness of 150 μm, and the heating temperature of the die was 200°C.

[0032]Add 10wt% of 1-butene into another twin-screw extruder (78mm in diameter, L / D=48, strong mixing type), and use a metering pump to add 90wt% of mixed oil through the side feeding port (Paraffin oil: sesame oil: dioctyl terephthalate = 10:2:1), melted and kneaded at 220 ° C to prepare a polyethylene solution, and the obtained solution was pumped from the two surface layers of the three-layer die through a metering pump For extrusion, the thickness of each layer is 270 μm, and the heating temperature...

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PUM

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Abstract

The invention discloses a method for preparing multiple layers of polyolefin microporous film and is used for preparing a polyethylene microporous film by utilizing a wet method. In the method disclosed by the invention, more than two polyolefin resin combinations with low hole closing temperature and high film breaking temperature are adopted; the polyolefin resin with low hole closing temperature and high film breaking temperature and one solvent in long paraffin, mineral oil, vegetable oil and benzoate are mixed into a solution; the polyethylene resin with high film breaking temperature and the solvent which is prepared by blending two or more than two solvents selected from the long paraffin, the mineral oil, the vegetable oil and the benzoate are mixed into a solution; and the polyolefin microporous film is prepared through the steps such as coextrusion, biaxial tension, solvent elution and the like. By the selection of the solvents, the method disclosed by the invention enables the polyolefin resin and the solvents to be easily fused and mixed, has good separation effect and can better control the aperture and thickness of the prepared film. The prepared film has the advantages of low hole closing temperature, high film breaking temperature and high intensity.

Description

technical field [0001] The invention relates to a method for manufacturing a multilayer polyolefin microporous membrane, in particular to a method for manufacturing a multilayer composite polyolefin microporous membrane with low closed cell temperature, high membrane rupture temperature and high strength. Background technique [0002] In 1991, SONY successfully launched the first commercial lithium-ion battery, which has the advantages of high energy density, long life, and high voltage. This secondary battery is widely used in portable electronic products, especially notebook computers and mobile phones. . Lithium-ion batteries usually consist of a lithium oxide positive electrode, a carbon negative electrode, a polymer separator, and an electrolyte. The diaphragm is an important part of the lithium battery. It uses its electrical insulation to separate the positive and negative electrodes of the battery to avoid short circuits. At the same time, its special structure allo...

Claims

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Application Information

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IPC IPC(8): B32B3/24B32B27/18B32B27/30
Inventor 段泰炜王松钊吴耀根蔡朝辉
Owner 康辉南通新材料科技有限公司
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