Method for producing polyolefin microporous membrane

A manufacturing method and microporous technology, applied in chemical instruments and methods, membranes, membrane technology, etc., can solve problems such as poor cycle characteristics, poor compression resistance, and insufficient compression resistance of microporous membranes

Inactive Publication Date: 2008-06-25
TONEN CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the compression resistance of the microporous membrane is poor, when used as a battery separator, there is a high possibility that the capacity of the battery will be insufficient (deterioration of cycle characteristics)
However, the compression resistance of the microporous membranes described in each of these patent documents is not sufficient.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0105] The mass average molecular weight (Mw) is 2.0×10 6 Ultra-high molecular weight polyethylene (UHMWPE, Mw / Mn: 11) 10% by mass, Mw is 3.3×10 5 80% by mass of high-density polyethylene (HDPE, Mw / Mn: 8.7) and Mw of 5.3×10 5 In 100 parts by mass of a polyolefin (PO) composition composed of 10 mass % of polypropylene self-polymer (PP), as an antioxidant, dry-blend tetrakis[methylene-3-(3,5-di-tert-butyl- 0.375 parts by mass of 4-hydroxyphenyl)-propionate] methane to prepare a mixture. Among them, the Mw measured for the polyethylene (PE) composition composed of UHMWPE and HDP is 5.1×10 5 , Mw / Mn is 12, the melting point is 135°C, and the crystallization dispersion temperature is 100°C.

[0106] Mw and Mw / Mn of UHMWPE, HDPEPE compositions, and polypropylene were determined by gel permeation chromatography (GPC) under the following conditions.

[0107] ・Measuring device: GPC-150C manufactured by Waters Corporation

[0108] ・Column: Shodex UT806M manufactured by Showa Denko ...

Embodiment 2

[0118] As the polyethylene-based resin, a PE composition (Mw: 4.2×10 5 , Mw / Mn: 11), the concentration of the PO solution is 35% by mass, the PO solution is squeezed so that its Q / Ns becomes 0.15, and the heat-fixing temperature is 129° C., except that it is carried out in the same manner as in Example 1 , making polyolefin microporous membranes.

Embodiment 3

[0120] As the polyethylene-based resin, a PE composition (Mw: 4.2×10 5 , Mw / Mn: 11), the concentration of the PO solution is 35% by mass, the PO solution is squeezed to make its Q / Ns 0.24, and the stretched film after cleaning is stretched to 1.3 in the TD direction at 130°C. times, except that the heat-fixing treatment temperature was 130° C., it was carried out in the same manner as in Example 1 to produce a polyolefin microporous membrane.

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Abstract

A method for producing a microporous polyolefin membrane by extruding a melt blend comprising a polyethylene resin, polypropylene having a mass-average molecular weight of 1 × 10 5 or more and an ethylene content of 5% by mass or less, and a membrane-forming solvent through a die, slowly cooling the resultant extrudate to form a gel-like sheet, stretching the gel-like sheet, and removing the above membrane-forming solvent, the slow-cooling speed of the extrudate being 30°C / second or less.

Description

technical field [0001] The present invention relates to a polymer having excellent balance of film thickness uniformity, mechanical properties, permeability, dimensional stability, shutdown properties, meltdown properties, and compression resistance comprising polyethylene-based resin and polypropylene. A method for producing an olefin microporous membrane. Background technique [0002] Mainly battery separators used in lithium secondary batteries, nickel-hydrogen batteries, nickel-cadmium batteries, polymer batteries, etc., polyolefin microporous membranes are widely used in separators for electrolytic capacitors, reverse osmosis filter membranes , ultrafiltration membranes, precision filtration membranes, various filters, moisture-permeable waterproof clothing, medical materials, etc. When a polyolefin microporous membrane is used as a separator for a battery, especially a separator for a lithium ion battery, its performance greatly affects the characteristics, productivi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/00C08J9/26H01M2/16B29C48/395H01M50/406H01M50/417H01M50/489H01M50/491H01M50/494
CPCH01M10/30B01D2325/34H01M10/345B01D71/26H01M2/145H01M2/1653B01D67/0027H01M10/052Y02E60/10H01M50/417H01M50/491H01M50/406H01M50/489H01M50/494C08J9/26H01M50/403C08L23/06C08L23/12C08J2323/06C08J2323/12Y02P70/50
Inventor 泷田耕太郎山田一博开米教充中村悌二河野公一
Owner TONEN CHEM CORP
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