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Preparation method of polyethylene microporous membrane and system thereof

A polyethylene microporous film, polyethylene technology, which is used in electrical components, circuits, battery pack parts and other directions, can solve the problems of high incidence of defective products, poor high temperature resistance and chemical corrosion resistance, and high cost, and can reach the soaking time. The effect of long, high temperature resistance and low shrinkage

Inactive Publication Date: 2012-10-17
SHANGHAI QIANCHENG TOY TECH
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Problems solved by technology

[0015] The purpose of the present invention is to provide a preparation method of a polyethylene microporous membrane, which can be used as a lithium-ion battery separator to solve the problems caused by the poor high temperature resistance and chemical corrosion resistance of the lithium-ion battery separator made in the prior art. Defects with high incidence of defective products and high cost
[0016] Another object of the present invention is to provide a preparation system for a polyethylene microporous membrane, which can be used as a lithium-ion battery separator to solve the problem of high temperature resistance and chemical corrosion resistance of lithium-ion battery separators made in the prior art. Poor performance leads to high incidence of defective products and high cost defects

Method used

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  • Preparation method of polyethylene microporous membrane and system thereof
  • Preparation method of polyethylene microporous membrane and system thereof

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Embodiment 1

[0036] Embodiment 1, the steps of the preparation method of a kind of polyethylene microporous membrane in the present embodiment are as follows:

[0037] 1. Add polyethylene, polypropylene, cross-linking agent, antioxidant and mineral oil into the mixer in a certain proportion to fully stir the raw materials. The mass ratio of mineral oil to antioxidant is 500~1800:1 , the mass ratio of crosslinking agent to mineral oil is 1:30~35, the mass ratio of mineral oil to polypropylene is 1000:20~900, and the mass ratio of mineral oil to polyethylene is 2~10:1.

[0038] The antioxidants in this embodiment can be phenolic antioxidants Irganox and 2,6-di-tert-butyl-4-methylphenol, and the crosslinking agent is polynorbornene.

[0039] 2. Put the mixture stirred in step 1 into a twin-screw extruder and heat it at 80-300°C for continuous extrusion to form a substrate.

[0040] The screw diameter of the twin-screw extruder here is 10-200 mm, and its extrusion capacity is greater than 200...

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Abstract

The invention brings forward a preparation method of a polyethylene microporous membrane and a system thereof. The preparation system of the polyethylene microporous membrane comprises a stirring device, an extrusion device, a cooling molding device, a bidirectional stretching device, an extraction device, a breadthwise stretching and a heat treatment device, wherein the stirring device, the extrusion device, the cooling molding device, the bidirectional stretching device, the extraction device, the breadthwise stretching device and the heat treatment device are connected in order. The preparation method provided by the invention can be adopted to produce an ultrathin polyethylene microporous membrane of 6 micrometers thickness and has advantages of high temperature resistance, corrosion resistance, good stability and long service life.

Description

technical field [0001] The invention relates to a preparation method and system, in particular to a preparation method and system of a polyethylene microporous membrane. Background technique [0002] Rechargeable lithium-ion secondary battery has the characteristics of high specific energy, long cycle life, no memory effect, and has the advantages of safety, reliability and fast charge and discharge, so it has become a hot spot in the research of new power supply technology in recent years. Since lithium-ion batteries are green, environmentally friendly and non-polluting secondary batteries, they meet the major development needs of energy and environmental protection in various countries today, and their usage in all walks of life is increasing rapidly. At present, secondary lithium-ion batteries are not only widely used in digital electronic products such as mobile phones, notebook computers, and MP3, but also in some high-power batteries such as electric vehicles and e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/06C08L23/12C08J9/28B29C69/00B29C47/00B29C55/16H01M2/16
CPCY02E60/12Y02E60/10
Inventor 屠兆辉
Owner SHANGHAI QIANCHENG TOY TECH
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