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Non-woven fabric based PVDF (polyvinylidene fluoride) film preparation method

A non-woven-based, composite membrane technology, applied in textiles and papermaking, electrical components, circuits, etc., can solve the problems of low porosity, poor composite membrane performance, complexity, etc., achieve low production costs, improve lyophilicity and liquid absorption, structure and morphology have little effect

Inactive Publication Date: 2016-12-07
王利萍
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  • Application Information

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Problems solved by technology

However, the control of the pore structure of the PVDF composite membrane is very complicated, and the hydrophobicity of the material itself and the low porosity of the polyolefin microporous membrane lead to poor performance of the above composite membrane.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0011] a. To prepare a composite membrane, add 2g PVDF powder into 100mL butanone in batches, stir vigorously, filter the above solution 3 times with a 500-mesh screen to obtain a uniform and clear coating solution, and immerse the PP non-woven fabric in the coating solution Take it out quickly, and dry it in a butanone atmosphere for 3 hours to obtain a non-woven fabric-based PVDF composite membrane.

[0012] b. For the modification of the composite membrane, configure the potassium hydroxide (mass fraction: 15%) diaphragm treatment solution with a ratio of ethanol and water of 1:1, and treat the above diaphragm with alkali at 35°C for 100 minutes, and the treated diaphragm is deionized Repeated soaking in water until neutral, and finally vacuum drying at 80°C for 6 hours to obtain the modified composite separator.

[0013] Through experiments, PP non-woven fabrics show super hydrophobicity, and the contact angle reaches more than 140°. After PVDF coating, the lyophilicity is...

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Abstract

A non-woven fabric based PVDF (polyvinylidene fluoride) film preparation method includes the steps: preparing a composite film; adding 2g of PVDF powder into 100mL of butanone in batches; strongly stirring the powder and the butanone; filtering solution for three times by a 500-mesh screen to obtain uniformly clarified coating liquid; soaking a PP (polypropylene) non-woven fabric in the coating liquid for 20 seconds; rapidly taking out the PP non-woven fabric; drying the PP non-woven fabric in butanone atmosphere for 3 hours to obtain a non-woven fabric based PVDF composite film. The composite film is modified, potassium hydroxide (with the mass fraction of 15%) diaphragm treatment liquid is prepared, the ratio of ethyl alcohol to water in the potassium hydroxide is 1:1, a diaphragm is subjected to alkali treatment for 100 minutes at the temperature of 35 DEG C, the treated diaphragm is repeatedly soaked by deionized water until being neutral, and the diaphragm is finally subjected to vacuum drying for 6 hours at the temperature of 80 DEG C to obtain the modified composite diaphragm. The preparation method has the advantages that reaction conditions are mild, production cost is low, repeatability is good, lyophilic and liquid-absorbent properties of the diaphragm can be improved, the structure and the morphology of the diaphragm are less affected, and the method is simple and effective.

Description

technical field [0001] The invention relates to a material synthesis method, in particular to a preparation method of a non-woven fabric-based PVDF membrane. Background technique [0002] Due to the advantages of high working voltage, high energy density, long cycle life and low self-discharge, lithium-ion batteries have become the main power source of various portable electronic products. As an important part of it, the separator can prevent positive and negative short circuits, provide a channel for ion transport when the battery is charging and discharging, and block ion conduction by closing the pores in case of an accident to prevent accidents. Therefore, the separator material should have excellent solvent resistance, ionic conductivity, mechanical strength, and heat resistance. In recent years, commercialized lithium battery separators are mainly polyethylene (PE) and polypropylene (PP) microporous membranes, which are produced by dry unidirectional, biaxial stretchi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M11/38H01M2/16D06M101/20
CPCD06M11/38D06M2101/20H01M50/411H01M50/44Y02E60/10
Inventor 王利萍
Owner 王利萍
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