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Polyolefin microporous membrane and its manufacturing method

A microporous membrane, polyolefin technology, applied in chemical instruments and methods, structural parts, battery pack parts, etc., can solve the problem of inability to obtain the shutdown temperature, and achieve excellent electrolyte injection and shutdown characteristics. Excellent balance of air permeability and strength, excellent balance of air permeability and strength

Active Publication Date: 2019-02-01
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Furthermore, there will be problems such as not being able to obtain sufficient shutdown temperature

Method used

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  • Polyolefin microporous membrane and its manufacturing method
  • Polyolefin microporous membrane and its manufacturing method
  • Polyolefin microporous membrane and its manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0207] (1) Preparation of the first polyolefin solution

[0208] Prepare the first polyolefin composition by dry blending, relative to the total weight of the first polyolefin composition, comprising (a) Mw of 2.0×10 6 HDPE (Mw / Mn: 8, melting point: 136°C) 20% by weight, (b) Mw is 2.5×10 5 HDPE (Mw / Mn: 8.6, terminal vinyl group concentration of 0.1 per 10000 carbon atoms, melting point: 134°C) 57% by weight, (c) Mw is 1.8×10 4 HDPE (Mw / Mn: 2.6, melting point: 123°C) 20% by weight, and (d) Mw is 9.7×10 4Polypropylene (Mw / Mn: 2.6, melting point: 155°C) 3% by weight. With respect to every 100 parts by weight of the first polyolefin composition, dry blend 0.2 parts by weight of tetrakis [methylene-3-(3,5-di-tert-butyl-4-hydroxyphenyl)-propionate] methane as anti- An oxidizing agent is used to formulate the first polyolefin resin.

[0209] 25 parts by weight of the first polyolefin resin was supplied to the intensive kneading twin-screw extruder, and 75 parts by weight of liqui...

Embodiment 2

[0213] (1) Preparation of the first polyolefin solution

[0214] Prepare the first polyolefin composition by dry blending, relative to the total weight of the first polyolefin composition, comprising (a) Mw of 2.0×10 6 HDPE (Mw / Mn: 8, melting point: 136°C) 20% by weight, (b) Mw is 2.5×10 5 HDPE (Mw / Mn: 8.6, terminal vinyl group concentration of 0.1 per 10,000 carbon atoms, melting point: 134°C) 52% by weight, (c) Mw is 2.4×10 4 HDPE (Mw / Mn: 3.0, melting point: 123°C) 25% by weight, and (d) Mw is 9.7×10 4 Polypropylene (Mw / Mn: 2.6, melting point: 155°C) 3% by weight. With respect to every 100 parts by weight of the first polyolefin composition, dry blend 0.2 parts by weight of tetrakis [methylene-3-(3,5-di-tert-butyl-4-hydroxyphenyl)-propionate] methane as anti- An oxidizing agent is used to formulate the first polyolefin resin.

[0215] 25 parts by weight of the first polyolefin resin was supplied to the intensive kneading twin-screw extruder, and 75 parts by weight of liq...

Embodiment 2～ Embodiment 10 and comparative example 1～ comparative example 8

[0221] According to the raw materials and conditions shown in Table 1 and Table 2, Comparative Example 1 followed Example 1, and Examples 2-10 and Comparative Examples 2-8 followed the method of Example 2 to produce polyolefin microporous membranes in the same manner. In addition, "-" in Table 1 and Table 2 indicates that UHMwPE or HDPE2 in the table is not included.

[0222] [Table 1]

[0223]

[0224] [Table 2]

[0225]

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Abstract

The present invention provides a polyolefin microporous membrane which is excellent in oxidation resistance, electrolyte injection property, and shutdown characteristics, and further excellent in permeability and strength balance. This polyolefin microporous membrane consists of polypropylene and polyethylene, has an electrolyte solution injection property of 20 seconds or less, a shutdown temperature of 132°C or less, and an air permeability of 700 seconds / 100cm when converted to a film thickness of 20 μm. 3 Hereinafter, the puncture strength when the film thickness is converted to 20 μm is 2,000 mN or more, and the distribution of polypropylene is uniform in the in-plane direction.

Description

technical field [0001] The invention relates to a polyolefin microporous membrane and a manufacturing method thereof, in particular to a polyolefin microporous membrane which can be used as a separator for batteries and a manufacturing method thereof. Background technique [0002] Polyolefin microporous membranes can be used in various applications such as battery separators, electrolytic capacitor separators, various filters, waterproof and moisture-permeable fabrics, reverse osmosis filtration membranes, ultrafiltration membranes, and microfiltration membranes. When a polyolefin microporous membrane is used as a battery separator, especially a lithium ion battery separator, its performance is closely related to battery characteristics, battery productivity, and battery safety. Therefore, it is required to have excellent permeability, mechanical properties, heat shrinkage resistance, shutdown properties, melting properties, and the like. For example, when a battery separat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/26B32B5/32B32B27/32C08J9/00C08L23/06C08L23/12H01M50/417H01M50/489
CPCB32B27/32C08L23/12Y02E60/10H01M50/581H01M50/417H01M50/489C08L23/06
Inventor 石原毅
Owner TORAY IND INC
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