Polyolefin microporous film, separator for non-aqueous electrolyte secondary battery, wound product of polyolefin microporous film, non-aqueous electrolyte secondary battery, and method for producing polyolefin microporous film

A non-aqueous electrolyte, microporous membrane technology, applied in the field of polyolefin-made microporous membranes, can solve the problem of not being able to have both high strength and high permeability, and achieve excellent appearance, puncture strength and excellent air resistance. Effect

Active Publication Date: 2016-11-30
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although it is disclosed that by setting the friction coefficient ratio of the front and back sides of the microporous membrane to be 1.5 or less, the windability at the time of rewinding can be improved, but high strength and high permeability cannot be achieved at the same time.

Method used

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  • Polyolefin microporous film, separator for non-aqueous electrolyte secondary battery, wound product of polyolefin microporous film, non-aqueous electrolyte secondary battery, and method for producing polyolefin microporous film
  • Polyolefin microporous film, separator for non-aqueous electrolyte secondary battery, wound product of polyolefin microporous film, non-aqueous electrolyte secondary battery, and method for producing polyolefin microporous film
  • Polyolefin microporous film, separator for non-aqueous electrolyte secondary battery, wound product of polyolefin microporous film, non-aqueous electrolyte secondary battery, and method for producing polyolefin microporous film

Examples

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preparation example Construction

[0053] (a) Preparation of polyolefin solution

[0054] A polyolefin solution obtained by heating and dissolving a polyolefin resin in a plasticizer is prepared. The plasticizer is not particularly limited as long as it is a solvent capable of sufficiently dissolving polyethylene. In order to enable stretching at a higher ratio, the solvent is preferably liquid at room temperature. Examples of liquid solvents include aliphatic, cycloaliphatic or aromatic hydrocarbons such as nonane, decane, decalin, p-xylene, undecane, dodecane, liquid paraffin, and mineral oils with corresponding boiling points. Fractions, and phthalates that are liquid at room temperature, such as dibutyl phthalate and dioctyl phthalate. In order to obtain a gel-like sheet with a stable liquid solvent content, it is preferable to use a non-volatile liquid solvent such as liquid paraffin. In the melt-kneading state, a solvent that is mixed with polyethylene but is solid at room temperature may be mixed with...

Embodiment 1

[0151]

[0152] For the weight average molecular weight (Mw) of 2.5×10 6 Ultra-high molecular weight polyethylene (UHMWPE) 40% by mass and Mw is 2.8×10 5 100 parts by mass of a polyethylene (PE) composition composed of 60 mass percent of high-density polyethylene (HDPE), dry-mixed tetrakis [methylene-3-(3,5-di-tert-butyl-4-hydroxyphenyl) - 0.375 parts by mass of propionate] methane to obtain a mixture.

[0153] 25 parts by mass of the obtained mixture were put into a strong mixing type twin-screw extruder (the input amount Q of the polyethylene composition: 54kg / h), and 75 g of flowing paraffin was supplied from the side feeder of the twin-screw extruder. Parts by mass were melt-kneaded at a temperature of 210° C. (Q / Ns: 0.3 kg / h / rpm) while maintaining the screw speed Ns at 180 rpm to prepare a polyethylene solution.

[0154] The obtained polyethylene solution was supplied to a T-die from a twin-screw extruder, and extruded into a sheet-shaped molded body. The extruded mo...

Embodiment 2～14、 comparative example 1、2、8～10

[0156] Except that the Mw of the UHMWPE used, the resin composition, the film forming conditions, the cutting width, the length, and the number of laminated sheets of the film wound on the core were changed as shown in Tables 1 and 2, the same as in Example 1 In the same manner, a polyolefin microporous membrane roll was produced.

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Abstract

The purpose of the present invention is to provide: a polyolefin microporous film which has excellent puncture strength and air resistance, does not undergo wrinkling or misalignment upon being wound and therefore enables the production of a wound product having excellent appearance; the wound product; and a method for producing a polyolefin microporous film. A polyolefin microporous film characterized by having puncture strength of 400 gf or more when the film has a thickness of 16 [mu]m and also having air resistance of 100 to 400 sec/100 cc when the film has a thickness of 16 [mu]m, and also characterized in that the static friction coefficient of the film is 0.5 to 1.0 as measured by superposing the front surface and the back surface of the film on each other.

Description

technical field [0001] The invention relates to a separation membrane and a microporous membrane, the separation membrane is used for the separation of substances, selective permeation, etc.; the microporous membrane is used as an alkaline secondary battery, lithium secondary battery, fuel cell, capacitor, etc. It is widely used as an isolation material for electrochemical reaction devices. In particular, it relates to a polyolefin microporous film suitable for use as a separator for lithium ion batteries. Background technique [0002] Polyolefin microporous membranes are used as precision filter membranes, diaphragms for fuel cells, diaphragms for capacitors, and the like. In addition, the polyolefin microporous film is particularly suitable as a separator for lithium ion batteries, which are widely used in notebook personal computers, mobile phones, digital cameras, and the like. The reason for this is that the polyolefin microporous membrane has excellent membrane punct...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/28C08L23/02H01M2/16H01M50/406H01M50/417H01M50/489H01M50/491
CPCC08F110/02Y02E60/10H01M50/417H01M50/491H01M50/406H01M50/489C08F2500/01C08F2500/26C08J5/22C08L23/06H01M10/0525Y02P70/50H01M50/449H01M50/403
Inventor 菅田正美日向野勝辉一宮崇
Owner TORAY IND INC
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