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Porous polypropylene resin film, separator for use in a battery, and battery

A polypropylene-based, porous membrane technology, applied in the field of porous membranes, can solve the problem of not being able to be used as an electrolyte, and achieve the effect of preventing the deterioration of battery characteristics

Inactive Publication Date: 2012-11-21
MITSUBISHI PLASTICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the aqueous solution will be electrolyzed at such a high voltage, it cannot be used as an electrolyte

Method used

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  • Porous polypropylene resin film, separator for use in a battery, and battery
  • Porous polypropylene resin film, separator for use in a battery, and battery
  • Porous polypropylene resin film, separator for use in a battery, and battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0258] With respect to 100 parts by mass of polypropylene resin (manufactured by Prime Polymer, Prime Polypro F300SV, MFR: 3g / 10 min), 0.2 parts by weight of antioxidant (manufactured by Ciba Specialty Chemicals, IRGANOX B225) is added and used as β crystal nucleation 3,9-bis[4-(N-cyclohexylcarbamoyl)phenyl]-2,4,8,10-tetraoxospiro[5.5]undecane 0.2 parts by mass of the agent, using Toshiba Machine Co., Ltd. The manufactured co-rotating twin-screw extruder (diameter φ40mm, L / D=32) was melted and kneaded at 270°C and extruded from a drawing die. The extruded tow was cooled in water at 30°C and used The cutter was pelletized to obtain resin composition A1.

[0259] The resin composition A1 was extruded at 200°C and cooled and solidified by a casting roll at 126°C to produce a non-porous film.

[0260] The non-porous membrane was stretched in the longitudinal direction at 110°C by 4 times, and then stretched in the transverse direction at 145°C by 2.0 times in sequential biaxial stretc...

Embodiment 2

[0263] Different from the above resin composition A1, high density polyethylene (manufactured by PrimePolymer, Hi-ZEX3300F, density: 0.950g / cm 3 , MFR: 1.1g / 10 min) 80 parts by mass of microcrystalline wax (manufactured by Nippon Seiki Co., Ltd., Hi-Mic1090) 20 parts by mass and dibenzylidene sorbitol as a nucleating agent (New Japan Physicochemical Co., Ltd. Made by the company, Gelol D) 0.2 parts by weight, using the same type of co-rotating twin-screw extruder at 230°C for melt-kneading and extruding from a drawing die, the extruded tow is placed in 30°C water It was cooled, and pelletized with a cutter to obtain a resin composition B1.

[0264] Use different extruders to extrude the resin compositions A1 and B1 at 200°C, pass them through two three-layer feed blocks, and co-extrude them with a T-die for multi-layer molding. After stretching, the film thickness ratio reached A1 / B1 / A1=3.5 / 1 / 3.5 to laminate, and then use a 127°C casting roll to cool and solidify, thereby fabrica...

Embodiment 3

[0268] Use different extruders to extrude the resin compositions A1 and B1 at 200°C, pass them through two three-layer feed blocks, and co-extrude them with a T-die for multi-layer molding. After stretching, the film thickness ratio reached A1 / B1 / A1=3.5 / 1 / 3.5 to laminate, and then use a casting roll at 125°C to cool and solidify to produce a laminated non-porous film.

[0269] The laminated non-porous film was stretched in the longitudinal direction at 120°C by 4.0 times, and then stretched at 98°C in the transverse direction by 2.0 times in sequential two-way stretching, and then relaxed by 6% in the transverse direction at 115°C to obtain Laminated porous membrane (sample).

[0270] Various characteristics of the obtained laminated porous film (sample) were measured and evaluated, and the results are summarized in Table 1.

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Abstract

Adjusting the air permeability that the disclosed porous polypropylene resin film exhibits when stretched allows said film to be used as a separator in a battery wherein the holes in said separator, in an wound electrode / separator assembly, are controlled. Said porous polypropylene resin film, which consists primarily of a polypropylene resin, is characterized by a pre-stretching air permeability (Pa) and an air permeability when stretched 5% (Pa') that satisfy the following: (1) Pa' is at most 1000 s / 100 ml; and (2) Pa' / Pa is at most 1.5.

Description

Technical field [0001] The present invention relates to a porous film mainly composed of polypropylene resin. Specifically, it relates to various separation membranes that can be used in packaging applications, sanitary applications, livestock applications, agricultural applications, construction applications, or medical applications, or porous membranes that can be used as light diffusion plates, battery separators, and the like. Among them, it particularly relates to a porous membrane suitable for use as a separator for a non-aqueous electrolyte battery. Background technique [0002] Polymer porous membranes with a large number of fine connected pores have been used as separation membranes used in the manufacture of ultrapure water, chemical solution purification, water treatment, etc., waterproof and moisture-permeable membranes used in clothing / sanitary materials, or in batteries The battery separators used in etc. are used in various fields. [0003] Secondary batteries have...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16C08J9/00H01M10/0566H01M50/417H01M50/489H01M50/491
CPCB32B27/18Y02E60/12B32B2307/726B32B27/32C08J2323/14B32B2250/03B32B2307/704B32B2250/242C08J2323/12B32B2307/724B32B2457/10B32B3/26B32B2250/40B32B2307/54B32B2307/518C08J5/2231B32B27/08H01M2/1653C08J5/18Y02E60/10H01M50/417H01M50/491H01M50/489H01M10/0525
Inventor 山本美保山田刚干宇佐见康
Owner MITSUBISHI PLASTICS INC
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