A kind of preparation method of high temperature resistant co-extruded uniaxially stretched microporous diaphragm and microporous diaphragm

A microporous diaphragm, uniaxial stretching technology, applied in the direction of separator/film/diaphragm/spacer element, structural parts, electrical components, etc., can solve the problem of limited matrix adhesion, poor extrusion processing performance, inorganic powder Body shedding and other problems, to achieve the effect of increased closed-cell temperature and film-breaking temperature, good high temperature resistance, and uniform pore size distribution
CN107845756BActive Publication Date: 2020-11-13GUANGDONG UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
GUANGDONG UNIV OF TECH
Publication Date
2020-11-13
Patent Text Reader

Abstract

The invention provides a method for preparing a high-temperature resistant co-extruded uniaxially stretched microporous membrane, which comprises the following steps: A) using three extrusion casting machines to respectively prepare polyphenylene sulfide and polytetramethylpentene The resin is melted and extruded, and multi-layer composite cast film is obtained through multi-layer die casting; wherein, polyphenylene sulfide is located in the outer layer, and polytetramethyl-pentene resin is located in the middle layer; B) the multi-layer composite cast film The film is heat-treated at 180-220°C for 0.3-2h to obtain a multi-layer heat-treated film; C) at 150-180°C, the multi-layer heat-treated film is stretched in the first stage, and the stretch ratio is 20%-80%; D) in 220-240°C, stretch the multilayer heat-treated film in the second stage, and the stretching ratio is 100%-120%; E) The microporous film obtained after the above-mentioned second stage stretching is set at 240-250°C for 1~ 5min to obtain a microporous membrane. The invention finally obtains a microporous diaphragm with uniform structure and high temperature resistance.
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Description

technical field

[0001] The invention relates to the technical field of isolation film production, in particular to a preparation method of a high temperature resistant co-extrusion uniaxially stretched microporous diaphragm and the microporous diaphragm. 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-ion battery. The quality of its performance plays a crucial role in the overall performance of the lithium-ion battery. Charging technology and battery cycle performance requirements at high rates are increasing, and the danger of battery explosion caused by battery self-heating has become increasingly prominent. High temperature resistance and high safety lithium battery separators have become an urgent need in the industry.

[0003] At present, lithium-ion battery separators are mainly crystalline polyolefin materials such as polyethylene (PE) and polypropylene (PP), w...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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