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Microporous polyolefin membrane and method for producing microporous polyolefin membrane

A technology of microporous membrane and manufacturing method, applied in the direction of separator/film/diaphragm/spacer element, electrolytic capacitor, electrical components, etc., can solve the problems of flowing large current, gas generation, heat generation, etc., and achieve rapid shutdown performance , high security effect

Pending Publication Date: 2021-02-26
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For batteries, if an external short circuit occurs, a large current will flow instantaneously, which may cause heat generation and gas generation.

Method used

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  • Microporous polyolefin membrane and method for producing microporous polyolefin membrane
  • Microporous polyolefin membrane and method for producing microporous polyolefin membrane
  • Microporous polyolefin membrane and method for producing microporous polyolefin membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0201] The weight average molecular weight shown in Table 1 will be 2.2×10 with respect to 40% by mass 6 g / mol, a molecular weight distribution of 6, an intrinsic viscosity of 16 dl / g ultra-high molecular weight polyethylene and a weight average molecular weight of 60% by mass of 4.1×10 5 g / mol, a molecular weight distribution of 13.5, and an intrinsic viscosity of 4.0 dl / g high-density polyethylene (long-chain branched polyethylene) polyolefin composition 100% by mass dry-blended tetrakis(methylene-3) as an antioxidant -(3,5-di-tert-butyl-4-hydroxyphenyl)-propionate) methane 0.2% by mass of the obtained raw material is put into the twin-screw extruder, and further fed from the side of the twin-screw extruder Liquid paraffin was supplied to the extruder, and what was mixed so that the polyolefin composition was 25% by mass and the liquid paraffin was 75% by mass was melt-kneaded in a twin-screw extruder to prepare a polyolefin solution.

[0202] This polyolefin solution was e...

Embodiment 2～4

[0205] Except having set the resin composition and manufacturing conditions shown in Table 1, it carried out similarly to Example 1, and obtained the polyolefin microporous membrane. The curves of the gas permeability resistance of the polyolefin microporous membranes of Examples 2, 3, and 4 with respect to temperature are shown in figure 2 , 3 , 4. In the curves of each of Examples 1 to 4, the primary fitting straight line is also described with a thin solid line. In addition, the mathematical formula of its first-time fitting straight line is annotated in the legend.

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Abstract

A microporous polyolefin membrane having an air permeation resistance of 300 sec / 100 cm<3> to 500 sec / 100 cm<3>, a porosity of 18-30%, a TD tensile elongation of 105% or higher, and a thickness less than 6 [mu]m.

Description

technical field [0001] The invention relates to a polyolefin microporous membrane and a method for producing the polyolefin microporous membrane. Background technique [0002] Microporous membranes are used in various fields such as filters such as filtration membranes and dialysis membranes, separators for batteries, and separators for electrolytic capacitors. Among these, microporous membranes made of polyolefin are widely used as separators for secondary batteries because they are excellent in chemical resistance, insulation, mechanical strength, etc., and have shutdown characteristics. [0003] When an external short circuit occurs in the battery, a large current flows instantaneously, which may cause heat generation and gas generation. Therefore, the separator is required to have a shutdown characteristic in which the pores are closed when abnormal heat generation occurs, and the battery reaction is interrupted. In addition, secondary batteries are expected to receive...

Claims

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Application Information

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IPC IPC(8): C08J9/26C08J9/00H01M50/417H01G11/52H01G9/02B29C67/20B29K23/00B29K105/04H01M50/409H01M50/489H01M50/491H01M50/494
CPCB29C67/20C08J9/00C08J9/26H01G9/02H01G11/52Y02E60/10H01M50/409H01M50/491H01M50/489H01M50/494
Inventor 陈燕仔金田敏彥竹田健人大友崇裕
Owner TORAY IND INC