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Polyolefin-based multilayer microporous film with excellent physical properties and high temperature stability

A technology of microporous membrane and polyolefin, which is applied in the fields of membrane, membrane technology, transportation and packaging, etc.

Inactive Publication Date: 2012-04-04
SK INNOVATION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the prior art described above cannot simultaneously achieve quality stability and rigidity / permeability at the level of wet process separation membranes and have thermal stability.

Method used

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  • Polyolefin-based multilayer microporous film with excellent physical properties and high temperature stability
  • Polyolefin-based multilayer microporous film with excellent physical properties and high temperature stability
  • Polyolefin-based multilayer microporous film with excellent physical properties and high temperature stability

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0115] In the polyethylene layer, a weight average molecular weight of 3.04×10 5 , polyethylene with a melting temperature of 135° C. and paraffin oil with a dynamic viscosity of 95 cSt at 40° C., the contents of the two components are 30% by weight and 70% by weight, respectively. The above-mentioned polyethylene and paraffin oil were mixed in a twin-screw kneader with Φ=46mm, and the mixing temperature was 220°C. The above polyethylene was added using the main hopper and the diluent paraffin oil was added to the extruder using a side feeder. The weight average molecular weight used in the heat-resistant layer is 2.5×10 5 Polypropylene with a melting temperature of 153°C and a crystallinity of 42% using ethylene as a comonomer and CaCO as a filler with an average particle size of 1.5 μm 3 , the contents of the two components are respectively 30% by weight and 70% by weight. The polypropylene and filler of the heat-resistant resin layer were kneaded / extruded in a Φ=40mm twi...

Embodiment 2

[0118] In the polyethylene layer, a weight average molecular weight of 3.0×10 5 , polyethylene with a melting temperature of 135° C. and paraffin oil with a dynamic viscosity of 95 cSt at 40° C., the contents of the two components are 30% by weight and 70% by weight, respectively. The above-mentioned polyethylene and paraffin oil were mixed in a twin-screw kneader with Φ=46mm, and the mixing temperature was 220°C. The above polyethylene was added using the main hopper and the diluent paraffin oil was added to the extruder using a side feeder. Use a weight average molecular weight of 3.5×10 in the heat-resistant resin layer 5 It is mixed with ethylene-propylene rubber (EPR) with a melting temperature of 164°C, polypropylene with a crystallinity of 41%, and polyarylate (Polyarylate) with a glass transition temperature of 200°C as a filler. The contents of the two components are respectively 60% by weight and 40% by weight. The polypropylene and filler in the heat-resistant re...

Embodiment 3

[0121] In the polyethylene layer, a weight average molecular weight of 3.0×10 5 , polyethylene with a melting temperature of 135° C. and paraffin oil with a dynamic viscosity of 95 cSt at 40° C., the contents of the two components are 30% by weight and 70% by weight, respectively. The above-mentioned polyethylene and paraffin oil were mixed in a twin-screw kneader with Φ=46mm, and the mixing temperature was 220°C. The above polyethylene was added using the main hopper and the diluent paraffin oil was added to the extruder using a side feeder. In the heat-resistant resin layer, the weight average molecular weight is 6.0×10 5 , the melting temperature is 231 ℃, the polymethylpentene (poly4-methyl-1pentene) that melting endothermic capacity is 40J / g and the average particle size as filler is the calcium carbonate of 2.5 μm, and the content of two components is respectively 35 weight %, 65% by weight. The polymethylpentene and filler in the heat-resistant resin layer were knead...

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Abstract

The present invention relates to a polyolefin-based multilayer microporous film which can be used as a battery separator, and to a method for producing the film. The polyolefin-based multilayer microporous film according to the present invention comprises: at least one layer comprising 90 to 100 wt % of polyethylene with a melting point of 130 to 140 DEG C; at least one other layer comprising 20 wt % or more of a heat-resistant resin; and 80 wt % or less of a filler selected from an organic filler, an inorganic filler, and a mixture thereof. The heat-resistant resin is preferably a semicrystalline polymer or an amorphous polymer. The semicrystalline polymer preferably has a degree of crystallinity of 10 to 45 % or a content heat of fusion of 20 to 90 J / g, a crystal melting temperature of 145 to 250 DEG C, and a glass transition temperature of -100 to 90 DEG C. The amorphous polymer has no crystals, and preferably has a glass transition temperature of 90 to 120 DEG C.

Description

technical field [0001] The present invention relates to a polyolefin-based multilayer microporous film excellent in quality stability and heat resistance. In particular, it relates to not only the low closed-cell temperature characteristics based on polyethylene, the high melting fracture temperature and low shrinkage characteristics based on heat-resistant resins, but also the characteristics of uniform microporosity and high rigidity / stability, and high permeability / high A polyolefin-based multilayer microporous film with strength properties exhibits excellent effects when used in a high-capacity / high-power secondary battery. The above-mentioned uniform microporosity and high rigidity / stability are the characteristics of the separation membrane produced by the wet method; the above-mentioned high permeability / high strength characteristics are caused by the large pores produced by the dry method. Background technique [0002] Polyolefin-based microporous films are widely u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/00B01D71/76H01M50/406H01M50/414H01M50/417H01M50/42H01M50/426H01M50/449H01M50/451H01M50/457H01M50/489
CPCY02E60/12H01M2/1686B01D69/12B01D69/02B01D2325/32H01M2/145H01M2/1653B01D69/148B01D2325/22B01D71/26Y10T428/249979Y10T428/249978Y02E60/10H01M50/449H01M50/417H01M50/451H01M50/457H01M50/414H01M50/489H01M50/426H01M50/42H01M50/406B01D71/261B01D69/1216B01D71/76B01D71/00
Inventor 姜贵权李荣根李章源郑仁和
Owner SK INNOVATION CO LTD
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