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Method for producing film and method for storing coating solution

A manufacturing method and technology for coating liquid, which can be applied to devices, coatings, structural parts and other directions for coating liquid on the surface, which can solve the problem that the risk of abnormal heat generation cannot be fully suppressed, and achieve the effect of sufficient air permeability and avoidance of defects.

Active Publication Date: 2020-08-21
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, there is a risk that the separator composed of the above-mentioned porous film cannot sufficiently suppress abnormal heat generation caused by internal short circuit

Method used

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Examples

Experimental program
Comparison scheme
Effect test

manufacture example 1

[0142] [Production Example 1: Production of Aromatic Polymer]

[0143] As an aromatic polymer, poly(p-phenylene terephthalamide) (hereinafter, abbreviated as PPTA) was produced by the following method.

[0144] A 3 L detachable flask equipped with a stirring blade, a thermometer, a nitrogen inflow tube, and a powder addition port was used. After fully drying the inside of the flask, 2200 g of N-methyl-2-pyrrolidone (hereinafter, abbreviated as NMP) was added to the flask, and 158.37 g of calcium chloride (used by vacuum drying at 200°C for 2 hours) was added, and the temperature was raised to 100°C. ℃ to completely dissolve calcium chloride. Subsequently, the temperature of the resulting solution was returned to room temperature (25° C.).

[0145] Next, 70.136 g of p-phenylenediamine (hereinafter, abbreviated as PPD) was added to this solution, and it was made to dissolve completely. 128.05 g of terephthaloyl dichloride (hereinafter, abbreviated as TPC) was added while main...

Embodiment 1

[0147] (1. Manufacture of coating liquid)

[0148] 100 g of the PPTA solution obtained in Production Example 1 was weighed into a 500 ml detachable flask having a stirring blade, a thermometer, a nitrogen inflow tube, and a liquid addition port. In the weighed PPTA solution, add 300 g of NMP and 6 g of alumina filler A (alumina C manufactured by Aerosil Corporation of Japan, with an average particle diameter of 0.013 μm and a specific surface area of ​​100 m 2 / g) and 6 g of alumina filler B (AA03 ​​manufactured by Sumitomo Chemical Co., Ltd., with an average particle size of 0.3 μm and a specific surface area of ​​5.0 m 2 / g). The added composition was stirred for 10 minutes, filtered through a 1000-mesh metal mesh, and a coating liquid 1 was obtained. Average particle diameter (D 50 ) was 0.76 μm, and the viscosity of the coating solution 1 was 3.2 Pa·s.

[0149] (2. Storage of coating liquid)

[0150] 300 g of the coating solution 1 was weighed into a 0.5 L detachable ...

Embodiment 2

[0160] (1. Manufacture of coating liquid)

[0161] Coating liquid 2 was produced in the same manner as in Example 1 (1. Production of coating liquid). The average particle diameter (D 50 ) was 0.75 μm, and the viscosity of the coating liquid 2 was 3.3 Pa·s.

[0162] (2. Storage of coating liquid)

[0163] Except for stirring at a peripheral speed of 1.0 m / s, the coating liquid 2 was stored in the same manner as in Example 1 (2. Storage of the coating liquid). The coating liquid 2 after 72 hours of storage was uniform without sedimentation of inorganic particles. of liquid. In addition, the coating liquid 2 was taken out from the lower port of the detachable flask after storage for 72 hours, and the average particle diameter and viscosity were measured. The average particle diameter (D 50 ) was 0.72 μm, and the viscosity of the coating liquid 2 was 2.9 Pa·s.

[0164] (3. Manufacture of laminated film)

[0165] A laminated film was obtained in the same manner as in Exampl...

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PUM

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Abstract

The present invention provides a film production method and a coating solution storage method capable of obtaining a film without defects due to uneven coating and maintaining sufficient air permeability when the coated film is used as a porous film degree of film. In the production method of the film and the storage method of the coating liquid, the coating liquid composed of a composition comprising an aromatic polymer, an inorganic particle, and a solvent is carried out at a peripheral speed of a stirring member of 0.05 m / sec to 2.0 m / sec. Stir.

Description

technical field [0001] The present invention relates to a method for producing a film and a method for storing a coating solution. Background technique [0002] Non-aqueous electrolyte secondary batteries such as lithium secondary batteries are currently widely used as batteries for devices such as personal computers, mobile phones, and portable information terminals. [0003] These nonaqueous electrolyte solution secondary batteries typified by lithium ion secondary batteries have high energy density. Therefore, when an internal short circuit or an external short circuit occurs due to damage to the battery or a device using the battery, a large current may flow rather than the water electrolyte secondary battery to generate heat. Therefore, non-aqueous electrolyte secondary batteries are required to ensure high safety by preventing heat generation above a certain level. [0004] As a method of ensuring the safety of the non-aqueous electrolyte secondary battery, it is gen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/18B05D7/24C08J9/26H01M2/16H01M50/443
CPCB05D7/24C08J5/18C08J9/26H01M50/443C09D7/61H01M50/446Y02E60/10
Inventor 佐藤裕之矢野浩二松下竜二
Owner SUMITOMO CHEM CO LTD
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