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Meta-aramid diaphragm and preparation method thereof

A kind of technology of aramid fiber and diaphragm, applied in the direction of rayon manufacturing, single-component polyamide rayon, fiber chemical characteristics, etc., can solve the problems of unfavorable lithium battery safety performance, loss of high temperature resistance performance, poor high temperature resistance performance, etc. Achieve the effects of increasing viscosity and toughness, improving high temperature resistance, and increasing molecular weight

Inactive Publication Date: 2020-09-15
HEBEI GELLEC NEW ENERGY MATERIAL SCI&TECHNOLOY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The traditional PE lithium battery separator has poor high temperature resistance, which is not conducive to the safety performance of lithium batteries
Aramid has very good heat resistance. The traditional meta-aramid is coated on PP or PE diaphragm to improve the heat resistance of the diaphragm, but the disadvantage is that the diaphragm is deformed at high temperature due to the base film is not resistant to high temperature. Aramid fiber coating is loose and loses high temperature resistance performance, which cannot maximize the high temperature resistance performance of aramid fiber

Method used

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  • Meta-aramid diaphragm and preparation method thereof

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Embodiment 1

[0048] A kind of preparation method of meta-aramid membrane of the present invention comprises the following steps:

[0049] Step 1: Under the condition of nitrogen protection, fully dissolve m-phenylenediamine in dimethylacetamide, stir at 35r / min for 20min to fully dissolve m-phenylenediamine, and obtain the first mixed solution; The frozen brine is passed into the jacket of the stirring tank, and after cooling the first mixed solution in the stirred tank to 0°C, add isophthaloyl chloride to the first mixed solution, and stir at 35r / min for 20min to mix Uniformly, to obtain the second mixed solution; then remove the frozen brine, and continue to stir until the second mixed solution is gradually heated to 80 ° C, the heating rate is 1 ° C / min, the heating time is 80 min, and then to the second mixed solution Calcium hydroxide was added to the solution, and stirring was continued at 35r / min for 30min to mix uniformly to obtain a meta-aramid solution; wherein, in the meta-ara...

Embodiment 2

[0064] A kind of preparation method of meta-aramid membrane of the present invention comprises the following steps:

[0065] Step 1: Under the condition of nitrogen protection, fully dissolve m-phenylenediamine in dimethylacetamide, stir at 38r / min for 20min to fully dissolve m-phenylenediamine, and obtain the first mixed solution; The frozen brine is passed into the jacket of the stirring tank, and after cooling the first mixed solution in the stirred tank to 3°C, add isophthaloyl chloride to the first mixed solution, and stir at 38r / min for 20min to mix Uniformly, to obtain the second mixed solution; then remove the frozen brine, and continue to stir until the second mixed solution is gradually heated to 80 ° C, the heating rate is 1 ° C / min, the heating time is 80 min, and then to the second mixed solution Calcium hydroxide was added to the solution, and stirring was continued at 38r / min for 30min to mix uniformly to obtain a meta-aramid solution; wherein, in the meta-ara...

Embodiment 3

[0080] A kind of preparation method of meta-aramid membrane of the present invention comprises the following steps:

[0081]Step 1: Under the condition of nitrogen protection, fully dissolve m-phenylenediamine in dimethylacetamide, stir at 40r / min for 20min to fully dissolve m-phenylenediamine, and obtain the first mixed solution; The frozen brine is passed into the jacket of the stirring tank, and after cooling the first mixed solution in the stirred tank to 5°C, add isophthaloyl chloride to the first mixed solution, and stir at 40r / min for 20min to mix Uniformly, to obtain the second mixed solution; then remove the frozen brine, and continue to stir until the second mixed solution is gradually heated to 80 ° C, the heating rate is 1 ° C / min, the heating time is 80 min, and then to the second mixed solution Calcium hydroxide was added to the solution, and stirring was continued at 40r / min for 30min to mix uniformly to obtain a meta-aramid solution; wherein, in the meta-aram...

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Abstract

The invention discloses a preparation method of a meta-aramid diaphragm. The method comprises the following steps: reacting m-phenylenediamine, isophthaloyl dichloride and calcium hydroxide in dimethylacetamide to obtain a meta-aramid solution; uniformly mixing the meta-aramid solution with dimethyl carbonate, and adjusting the viscosity to 25000-30000 mpa.s to obtain meta-aramid slurry; extrudingthe meta-aramid slurry to obtain a cast sheet, and transversely stretching the cast sheet to obtain a diaphragm precursor; vertically stretching the diaphragm precursor to obtain a diaphragm semi-finished product; and carrying out extraction curing on the semi-finished diaphragm product, drying, and rolling to obtain the meta-aramid diaphragm. According to the invention, a considerable amount ofcalcium hydroxide is added in a synthesis process of meta-aramid to form a calcium salt system in a meta-aramid solution, so that the molecular weight of the meta-aramid is improved, and the viscosityand toughness of the slurry of the meta-aramid are improved; and transverse and vertical stretching is carried out in the membrane preparation process, so that the slurry forms a membrane uniformly,the internal stress during extraction and curing is reduced, pores are formed in the membrane uniformly, and the high-temperature resistance of the membrane is remarkably improved.

Description

technical field [0001] The invention relates to the technical field of lithium battery separators, in particular to a meta-aramid separator and a preparation method thereof. Background technique [0002] The traditional PE lithium battery separator has poor high temperature resistance, which is not conducive to the safety performance of lithium batteries. Aramid has very good heat resistance. The traditional meta-aramid is coated on PP or PE diaphragm to improve the heat resistance of the diaphragm, but the disadvantage is that the diaphragm is deformed at high temperature due to the base film is not resistant to high temperature. Aramid fiber coating is loose and loses high temperature resistance performance, which cannot maximize the high temperature resistance performance of aramid fiber. Contents of the invention [0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a method for preparing a meta-aramid membrane. ...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16D01F1/10D01F6/90
CPCD01F6/905D01F1/10Y02E60/10
Inventor 袁海朝徐锋李腾苏碧海
Owner HEBEI GELLEC NEW ENERGY MATERIAL SCI&TECHNOLOY CO LTD
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