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Porous polypropylene resin film, cell separator, and cell

A technology of polypropylene and porous membranes, applied in the field of porous membranes, can solve problems such as not being able to be used as an electrolyte, and achieve excellent sliding properties

Active Publication Date: 2012-11-14
MITSUBISHI CHEM CORP
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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, cell separator, and cell
  • Porous polypropylene resin film, cell separator, and cell
  • Porous polypropylene resin film, cell separator, and cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0251] With respect to 100 parts by mass of polypropylene-based resin (manufactured by Prime Polymer, Prime Polypro F300SV, MFR: 3 g / 10 min), 0.2 part by weight of antioxidant (manufactured by Ciba Specialty Chemicals, IRGANOX B225) and nucleated as beta crystals were added 0.2 parts by mass of N,N'-dicyclohexyl-2,6-naphthalenediamide as an agent, using a co-rotating twin-screw extruder (diameter φ40mm, L / D=32) manufactured by Toshiba Machine Co., Ltd. at 270°C It melt-kneaded, it processed into pellet form, and obtained resin composition A1.

[0252] The resin composition A1 was extruded at 200°C, cooled and solidified by a casting roll at 130°C, and a nonporous film having a thickness of 80 μm was produced. The above-mentioned non-porous film was subjected to sequential biaxial stretching by stretching 4 times in the longitudinal direction at 105° C., and then stretching 2 times in the transverse direction at 145° C., and then relaxing the film by 6% in the width direction a...

Embodiment 2

[0255]Different from the above-mentioned resin composition A1, high-density polyethylene (manufactured by Prime Polymer Co., Ltd., Hi-ZEX3300F, density: 0.950 g / cm) was used as a polyethylene-based resin. 3 , MFR: 1.1g / 10 minutes) 90 parts by mass of microcrystalline wax (manufactured by Nippon Seiki Co., Ltd., Hi-Mic1090) 10 parts by mass and polyethylene-based masterbatch containing a nucleating agent (manufactured by Riken Vitamin Co., Ltd.) , RIKEMASTER CN-002) 2.5 parts by weight, and use the same type of co-rotating twin-screw extruder to melt and knead at 230 ° C, and then process it into pellets to obtain resin composition B1.

[0256] Resin compositions A1 and B1 were extruded using different extruders at 200°C, passed through two three-layer feedblocks, co-extruded using a T-die for multi-layer molding, and were drawn so that After stretching, the film thickness ratio was A1 / B1 / A1=3.5 / 1 / 3.5, and it was laminated, and then cooled and solidified by a casting roll at 12...

Embodiment 3

[0260] The above-mentioned resin compositions A1 and B1 were extruded at 200°C using different extruders, passed through two three-layer feedblocks, co-extruded using a T-die for multilayer molding, and were After stretching, the film thickness ratio was A1 / B1 / A1=3.5 / 1 / 3.5, and the lamination was carried out. Then, it was cooled and solidified by a casting roll at 127°C, and a laminated non-porous film with a thickness of 80 μm was produced. thing.

[0261] The above-mentioned laminated non-porous film was subjected to sequential biaxial stretching by stretching 4.6 times in the longitudinal direction at 120°C, and then stretching 2 times in the transverse direction at 98°C, and then relaxing the film in the width direction at 115°C for 6 times. %, a laminated porous membrane was obtained.

[0262] Various properties of the obtained laminated porous film were measured and evaluated, and the results are summarized in Table 1.

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Abstract

Proposed is a porous polypropylene resin film which comprises a polypropylene-based resin as the main component and in which the coefficient of static friction between the films is higher than that between the film and SUS. When used as a cell separator, the porous polypropylene resin film exhibits excellent slipperiness and workability.

Description

technical field [0001] The present invention relates to a porous membrane mainly composed of a polypropylene-based resin. Specifically, it relates to various separation membranes that can be used, for example, in packaging, hygiene, livestock, agricultural, construction, or medical applications, or porous membranes that can be used as light-diffusing plates, battery separators, and the like. Among them, it relates to a porous membrane suitable for use as a separator for a non-aqueous electrolyte battery in particular. Background technique [0002] Polymer porous membranes with a large number of fine interconnected pores have been used as separation membranes used in the production of ultrapure water, purification of chemical solutions, water treatment, etc. It is used in various fields such as battery separators and the like. [0003] Secondary batteries have been widely used as power sources for portable devices such as OA, FA, home appliances, and communication devices. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/00B29C55/14H01M2/16H01M10/0566H01M50/417H01M50/491
CPCB29K2023/10B29K2105/0005Y02E60/122C08J5/18B29K2023/12H01M10/052C08J2323/12H01M2/1653B29C55/005B29D7/01H01M10/0566B29K2105/04B29C55/14Y02E60/10H01M50/417H01M50/491C08J9/00H01M10/05H01M50/411H01M50/489
Inventor 山本美保山田刚干宇佐见康
Owner MITSUBISHI CHEM CORP
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