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Polyolefin microporous membrane

A microporous membrane, polyolefin technology, applied in structural parts, battery pack parts, electrochemical generators, etc., can solve the problem of undocumented biaxially stretched membrane strain rate, etc., to improve productivity and safety. , The effect of preventing shrinkage and excellent heat resistance

Active Publication Date: 2020-02-11
ASAHI KASEI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It should be noted that Patent Document 1 does not describe the strain rate of the biaxially stretched film at the time of heat setting.

Method used

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  • Polyolefin microporous membrane
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0233] (A) Using a tumbler blender (tumbler blender), 45 mass % of Mv700,000 high-density polyethylene, 45 mass % of Mv250,000 high-density polyethylene, and 10 mass % of Mv400,000 homopolypropylene were dry-blended to obtain Raw resin mixture. 32% by mass of the raw material resin mixture, 68% by mass of liquid paraffin, and 1% by mass of antioxidant were blended to obtain a polyolefin composition. Next, the polyolefin composition was put into a twin-screw extruder, and the molten polyolefin composition was extruded with a die-lip pitch of 820 μm to form a gel-like sheet, which was cooled and solidified with calender rolls.

[0234] (B) Using a simultaneous biaxial stretching machine with a set temperature of 122° C., a surface magnification of 49 times (7 times in the longitudinal direction, and 7 times in the width direction), a strain rate of 22% / sec in the longitudinal direction, and a relative The cooled and solidified sheet was stretched at a strain rate in the width d...

Embodiment 2～11 and comparative example 1～9

[0240] A polyolefin microporous membrane was obtained and evaluated in the same manner as in Example 1 except that the production conditions shown in Table 1 were used. The evaluation results are shown in Table 1 below.

Embodiment 12～13

[0242] (A) 25% by mass of Mv2 million polyethylene, 15% by mass of Mv700,000 high-density polyethylene, 30% by mass of Mv250,000 high-density polyethylene, and 30% by mass of Mv150,000 high-density polyethylene using a drum mixer The polyethylene is dry blended to obtain a polyolefin resin mixture. 35% by mass of the raw material resin mixture, 65% by mass of liquid paraffin, and 1% by mass of antioxidant were blended to obtain a polyolefin composition. A polyolefin microporous membrane was obtained and evaluated in the same manner as in Example 1 except that the resin composition obtained in this way was used and the production conditions shown in Table 1 were used. The evaluation results are shown in Table 1 below.

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Abstract

A polyolefin microporous membrane has a piercing elongation of 2.30 mm or lower and the temperature of the stress variation point is 80.0 DEG C or higher and the stress peak value is 1.8 g or lower inthermomechanical analysis (TMA) of the width direction of the polyolefin microporous membrane.

Description

technical field [0001] The present invention relates to a polyolefin microporous membrane and a manufacturing method thereof. Background technique [0002] Polyolefin microporous membranes are used for separators for batteries, separators for capacitors, materials for fuel cells, precision filtration membranes, etc. because of their excellent electrical insulation or ion permeability, and are especially used as lithium ion secondary membranes. Separator for batteries. [0003] In recent years, lithium-ion secondary batteries are being used in small electronic devices such as mobile phones and notebook personal computers, and electric vehicles such as electric cars and small electric motorcycles. Separators for lithium-ion secondary batteries are required not only to have mechanical properties and ion permeability, but also to have the following properties: due to the heat generation of the secondary battery, the micropores of the separator are blocked by thermal melting, et...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/26H01M50/403H01M50/406H01M50/417H01M50/489H01M50/491
CPCC08J2323/06C08J5/18C08J2423/12C08J7/06Y02E60/10C08J9/28C08J2201/0543C08J9/0061C08J2423/06H01M50/403H01M50/417H01M50/491H01M50/406H01M50/489C08J9/26B29C48/0018B29C48/08B29C55/16H01M10/0525
Inventor 梶原真奈宫泽博
Owner ASAHI KASEI KK
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