Polyolefin multilayer micro-porous membrane and preparation method thereof

A microporous film and polyolefin technology, applied in chemical instruments and methods, layered products, synthetic resin layered products, etc., can solve the problems of poor tensile effect of polypropylene layer and inability to industrialize wet-process polypropylene separators, etc. , to achieve high membrane rupture temperature, low heat shrinkage, and stable quality

Active Publication Date: 2012-06-20
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

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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 75 parts by weight of kerosene are 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 is added to the twin-screw...

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

The invention discloses a polyolefin multilayer micro-porous membrane and a preparation method thereof. The middle layer of the polyolefin multilayer micro-porous membrane is a polyethylene micro-porous membrane; both surface layers of the polyolefin multilayer micro-porous membrane are micro-porous membranes which respectively contain polypropylene and polyethylene with super-high molecular weight; the polyethylene of the middle layer has the molecular weight of 1*105 to 6*105; the polypropylene of the surface layers has the molecular weight of 1*105 to 1*106; and the polyethylene of the surface layers has the molecular weight of 5*105 to 5*106. The preparation method comprises the following steps: firstly, respectively fusing to mix the raw auxiliary material of the middle layer and the raw auxiliary materials of the surface layers; putting the raw auxiliary materials of the middle layer and the surface layers into a twin-screw extruder; extruding through a multilayer co-extrusion die head; cooling; and then, drawing to manufacture the membrane, extracting and shaping to obtain the polyolefin multilayer micro-porous membrane.

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 Applications(China)
IPC IPC(8): B32B3/24B32B27/08B32B27/32B29C47/92B29C47/06H01M2/16B29C48/40B29C48/92H01M50/417H01M50/457H01M50/489H01M50/491H01M50/494
CPCY02E60/12B29C47/0057B29C47/40B29C47/06B32B27/08B29C47/0021B29C47/92B29C47/065B32B2307/724B32B2307/726H01M2/16B32B27/32B29C48/92B29C2948/92704B29C48/08B29C48/0018B29C48/21B29C48/40B29C2948/92895B29C2948/92923Y02E60/10H01M50/417H01M50/491H01M50/489H01M50/457H01M50/494
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
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