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Polyolefin multilayer micro-porous membrane and preparation method thereof

A microporous membrane, polyolefin technology, applied in chemical instruments and methods, layered products, synthetic resin layered products, etc., can solve problems such as the inability to industrialize the wet-processed polypropylene diaphragm and the poor stretching effect of the polypropylene layer. , to achieve the effect of low thermal shrinkage, high film breaking temperature and low closed cell temperature

Active Publication Date: 2014-06-04
河南惠强新能源材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, through in-depth research, we found that the stretching effect of the polypropylene layer prepared by the wet method is very poor, which is also the main reason why the wet method polypropylene separator cannot be industrialized

Method used

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  • Polyolefin multilayer micro-porous membrane and preparation method thereof
  • Polyolefin multilayer micro-porous membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Use high-density polyethylene HDPE (Mw=3.0×10 5 , melting point 133°C), linear low density polyethylene LLDPE (Mw=2.0×10 5 , melting point 120°C) as the polyethylene raw material for the preparation of the middle layer, 22 parts by weight of HDPE and 3 parts of LLDPE are added to the twin-screw extruder, and then 75 parts by weight of kerosene is added to the twin-screw extruder through the side feed port In the exit machine (length-to-diameter ratio: 48), it is melted at 220°C and mixed uniformly to form a polyethylene solution, which is extruded from the core layer of the three-layer die with a thickness of 400 μm.

[0044] Polypropylene PP (Mw=1.2×10 6 , melting point 166°C) and ultra-high molecular weight polyethylene UHMWPE (Mw=1.0×10 6 , melting point 136°C) as raw materials for preparing the surface layer, 12 parts by weight of PP and 8 parts by weight of UHMWPE are added to the twin-screw extruder, and then 80 parts by weight of kerosene are added to the twin-...

Embodiment 2

[0047] The difference from Example 1 is that the molecular weight of the surface layer is 2.1×10 6 The ultra-high molecular weight polyethylene, all the other are identical with embodiment 1. The performance of the separator is shown in Table 1.

Embodiment 3

[0049] The difference from Example 1 is that the molecular weight of the surface layer is 5.0×10 6 The ultra-high molecular weight polyethylene, all the other are identical with embodiment 1. The performance of the separator is shown in Table 1.

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Abstract

Disclosed is a polyolefin multi-layer porous microfilm and a manufacturing method therefor, the polyolefin multi-layer porous microfilm has an intermediate layer of polyethylene porous microfilm and two surface layers of porous microfilm both comprised of a polypropylene and a polyethylene having ultra-high molecular weight; the polyethylene of the intermediate layer has a molecular weight of 1x105 to 6x105; the polypropylene of the surface layer has a molecular weight of 1x105 to 1x106 and the polyethylene of the surface layer has a molecular weight of 5x105 to 5x106. In the preparation method, a raw auxiliary material for the intermediate layer and a raw auxiliary material for the surface layers are molten and mixed, the raw auxiliary materials of the intermediate and surface layers are dosed into a two-screw extruder, and then the same is subjected to multi-layer co-extrusion at a die, cooling and then drawing for film-forming, extracting and shaping, in order to obtain the product.

Description

technical field [0001] The invention relates to a polyolefin multilayer microporous composite membrane composed of polyethylene and polypropylene and a preparation method thereof. Background technique [0002] In recent years, the shortage of petroleum energy resources, the soaring price of international petroleum, and the increasingly serious environmental problems caused by the use of petrochemical energy have attracted the attention of the world to new environmentally friendly energy, and provided unprecedented opportunities for the development of new energy power battery industry. Due to the advantages of high energy density, no memory effect, long service life, high cycle charge and discharge efficiency, and low environmental pollution, lithium-ion secondary batteries have become a new generation of batteries that are widely used. Based on the current technical development of batteries, lithium-ion secondary batteries have become the best choice for new energy power bat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B3/24B32B27/08B32B27/32B29C47/92B29C47/06H01M2/16B29C48/40B29C48/92H01M50/417H01M50/457H01M50/489H01M50/491H01M50/494
CPCH01M2/1686B29C47/92B32B2307/726B29C47/065B29C47/40B32B27/32B32B27/08H01M2/1653B29C47/0021B32B2307/724B29C47/0057B29C48/92B29C2948/92704B29C48/08B29C48/0018B29C48/21B29C48/40B29C2948/92895B29C2948/92923Y02E60/10H01M50/417H01M50/491H01M50/489H01M50/457H01M50/494
Inventor 王松钊王辉蔡朝辉吴耀根廖凯明
Owner 河南惠强新能源材料科技股份有限公司