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Para-aramid and polyetherimide blended slurry, preparation method thereof and para-aramid coating diaphragm

A polyetherimide, para-aramid fiber technology, applied in electrical components, circuits, battery pack parts, etc., can solve the problem of reducing the porosity of the diaphragm, achieve good air permeability and heat resistance, avoid pores The effect of reducing the air permeability and avoiding the increase of the air permeability value

Pending Publication Date: 2021-04-30
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

[0004] The purpose of the present invention is to provide a preparation method of para-aramid and polyetherimide blend slurry in view of the technical defect that the para-aramid coating causes the porosity of the diaphragm to decrease in the prior art

Method used

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  • Para-aramid and polyetherimide blended slurry, preparation method thereof and para-aramid coating diaphragm
  • Para-aramid and polyetherimide blended slurry, preparation method thereof and para-aramid coating diaphragm
  • Para-aramid and polyetherimide blended slurry, preparation method thereof and para-aramid coating diaphragm

Examples

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Effect test

Embodiment 1

[0035] A preparation method of para-aramid and polyetherimide blend slurry, comprising the following steps:

[0036] Step 1: Add 8 parts by mass of calcium chloride to 92 parts by mass of N-methylpyrrolidone (NMP), raise the temperature to 60°C with a stirring jacket, and stir for 60 minutes until the calcium chloride is completely dissolved to obtain the first mixture solution;

[0037] Step 2: Cool the first mixed solution obtained in step 1 to room temperature, then add polytetramethylene glycol to the first mixed solution and stir evenly with a paddle-type agitator for 5 minutes, turn off the rotation, and paddle-type The revolution speed of the agitator is 35r / min (the agitator in the agitator is a paddle type, which is generally relatively large, and the stirring speed is relatively slow, which is called revolution. There are small dispersing discs in the paddle type stirring blade, which will follow the stirring The device revolves, and it also rotates during the revol...

Embodiment 2

[0046] A preparation method of para-aramid and polyetherimide blend slurry, comprising the following steps:

[0047] Step 1: Add 11 parts by mass of calcium chloride to 89 parts by mass of N-methylpyrrolidone (NMP), raise the temperature to 70°C with a stirring jacket, and stir for 60 minutes until the calcium chloride is completely dissolved to obtain the first mixture solution;

[0048] Step 2: Cool the first mixed solution obtained in step 1 to room temperature, then add polytetramethylene glycol to the first mixed solution and stir evenly with a paddle stirrer for 7 minutes, turn off the rotation, and the revolution speed is 35r / min, then add gas-phase nano-ceramic particles and stir evenly, the revolution speed is 40r / min, the rotation speed is 2000r / min, the stirring time is 35min, and finally add the pin-type nano-sand mill for sanding, the sanding speed The setting is 900r / min, and the sanding time is 17min; in terms of parts by mass, the ratio of the first mixed solu...

Embodiment 3

[0054] A preparation method of para-aramid and polyetherimide blend slurry, comprising the following steps:

[0055] Step 1: Add 15 parts by mass of calcium chloride to 85 parts by mass of N-methylpyrrolidone (NMP), raise the temperature to 80° C. with a stirring jacket, and stir until the calcium chloride is completely dissolved to obtain the first mixed solution;

[0056] Step 2: Cool the first mixed solution obtained in step 1 to room temperature, then add polytetramethylene glycol to the first mixed solution and stir evenly, the stirring time is 10 minutes, turn off the rotation, the revolution speed is 35r / min, and then add the gas phase The nano-ceramic particles are stirred evenly, the stirring revolution speed is 40r / min, the rotation speed is 2000r / min, the stirring time is 40min, and finally put into the pin-type nano-sand mill for sanding, and the sanding speed is set at 900r / min. The sanding time is 20 minutes; in terms of parts by mass, the ratio of the first mixe...

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Abstract

The invention discloses para-aramid and polyetherimide blended slurry, a preparation method thereof and a para-aramid coating diaphragm. According to the preparation method, the amount of added calcium chloride is increased when the para-aramid is synthesized, so that free calcium ions and chloride ions occupy the positions of hydrogen and oxygen in the para-aramid to eliminate hydrogen bonds between para-aramid nanofibers, then polybutylene glycol is used for blocking connection between para-aramid molecules, and polymerization between macromolecules is controlled. The para-aramid slurry forms a highly dispersed and non-deteriorating slurry. The dissolved polyetherimide solution is added to allow the highly dispersed para-aramid nanofibers to be uniformly absorbed in the polyetherimide molecular chain. When the slurry is extracted and solidified, the polyetherimide molecules will form a porous net to support a skeleton of the para-aramid nanofiber due to the detachment of the pore former, so that the whole diaphragm generates a coating diaphragm with high temperature resistance and high porosity.

Description

technical field [0001] The invention relates to the technical field of lithium battery diaphragms, in particular to a para-aramid and polyetherimide blend slurry, a preparation method thereof, and a para-aramid coated diaphragm. Background technique [0002] Although the para-aramid coating has high temperature resistance, its molecular weight has a great influence on the coating of the diaphragm. It is difficult to grasp its suitable molecular weight during the synthesis process, and the temperature resistance and adhesion of the molecular weight are too small All have been reduced, and the molecular weight is too large to be easily cured and deteriorated, so a method is needed to control its molecular weight during the synthesis process. [0003] The adsorption capacity between para-aramid fibers is very strong, and it is easy to bond together when coated on the surface of the diaphragm, so that the porosity of the diaphragm becomes very small. Now a special skeleton struc...

Claims

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Application Information

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IPC IPC(8): H01M50/403H01M50/44H01M50/423H01M50/449H01M50/443H01M50/446
CPCY02E60/10
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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