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Process for preparing polymer microporous membrane and usage of same

A polymer membrane, microporous membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of high equipment investment cost and difficult pore size

Inactive Publication Date: 2008-06-18
上海世龙科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the MSCS method does not include any phase separation process, its process is relatively easy; but its pore size control is difficult, and the equipment investment cost is relatively large

Method used

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  • Process for preparing polymer microporous membrane and usage of same
  • Process for preparing polymer microporous membrane and usage of same
  • Process for preparing polymer microporous membrane and usage of same

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0014] The invention provides a method for preparing a microporous membrane that can be used in a secondary battery, which includes the step of preparing a polymer membrane material containing one or more small molecule additives.

[0015] In the method of the present invention, a polymer film material containing one or more small molecule additives is first prepared. The method for preparing the polymer film containing the small molecule additive is not particularly limited, and may be any method known in the art. In a preferred example of the present invention, the preparation method of the polymer film includes: mixing the polymer and the small molecule additive in a certain proportion, and casting to form a film.

[0016] Applicable polymers and small molecule additives can be selected according to the needs of specific applications. For example, the polymerized monomers used to form the polymers of the present invention may be selected from C 1-10 Olefins such as ethyle...

Embodiment 1

[0040] This example illustrates the effect of the temperature of the supercritical fluid on the final elution rate of small molecules.

[0041] Mix polyethylene polymer and N, N-diethyl-m-toluamide small molecule additive in a weight ratio of 4:6, and cast to form a film

[0042]The polymer membrane material containing 60% small molecule additive is put into the chamber of supercritical fluid equipment (purchased from Hangzhou Huali Pump Industry Co., Ltd.), and the polymer membrane material prepared is treated with supercritical carbon dioxide fluid. For elution, the operating pressure was controlled at 25MPa, and the cleaning time was 30 minutes. After the membrane was taken out, it was dried, and the quality difference before and after cleaning was compared. The results are listed in Table 1 below.

[0043] Table 1

[0044]

[0045] The test results show that the suitable temperature of supercritical fluid is between 35 and 45°C.

Embodiment 2

[0047] This example illustrates the effect of supercritical fluid operating pressure on the final small molecule elution rate.

[0048] Mix the polypropylene polymer and the butanol small molecule additive in a weight ratio of 4:6, and cast it into a film

[0049] Put the polymer membrane material containing 60% small molecule additive into the chamber of supercritical fluid equipment (purchased from Hangzhou Huali Pump Industry Co., Ltd.), and use supercritical carbon dioxide fluid to elute the prepared polymer membrane material , the cleaning temperature was controlled at 40°C, and the cleaning time was 30 minutes. After the membrane was taken out, it was dried, and the quality difference before and after cleaning was compared. The results are listed in Table 2 below.

[0050] Table 2

[0051]

[0052] The test results show that the operating pressure is suitable between 15 and 25 MPa.

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Abstract

The invention provides a preparation method of polymer microporous membrane, including: a) polymer membrane material containing one or a plurality of small molecular additives is provided; b) supercritical fluid is used to elute the small molecular additives in the polymer membrane material so as to form a micropore structure inside the membrane; c) the micropore membrane which is extracted and cleaned by supercritical fluid is dried so as to get the poly microporous membrane.

Description

technical field [0001] The present invention relates to a method for preparing a microporous membrane by supercritical fluid technology, and relates to the use of the diaphragm in a secondary battery. Background technique [0002] Microporous membranes were commercially available in nitrocellulose microfiltration membranes in the 1930s, and this early technology for manufacturing microfiltration membranes was extended to other polymers in the next 20 years. After the 1960s, the research of microporous membranes was mainly to develop new varieties, control the pore size distribution of membranes, and expand the scope of application. In recent years, microporous membranes made of polytetrafluoroethylene, polyvinylidene fluoride, polyethylene, and polypropylene have been commercialized in the United States, Germany, and Japan. At present, microporous membranes are widely used and have a large sales volume. Filtration sterilization in the pharmaceutical industry is its largest...

Claims

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Application Information

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IPC IPC(8): B01D67/00H01M2/14H01M50/403H01M50/414
CPCY02E60/12Y02E60/10
Inventor 叶寅王兮希张雪冰邱士龙蔡锡明
Owner 上海世龙科技有限公司
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