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Polypropylene microporous membrane and preparation method thereof

A polypropylene microporous film, polypropylene technology, applied in electrical components, circuits, battery pack components and other directions, can solve the problems of high cost of precision equipment, waste of production capacity, etc., to achieve good size and distribution uniformity, good microscopic uniformity sexual effect

Active Publication Date: 2015-05-27
SHENZHEN ZHONGXING NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, once the process is confirmed, the yield mainly depends on the precision of the equipment, but on the one hand, the cost of precision equipment is high, and on the other hand, the problem of uniformity cannot be solved from the front end, which will eventually lead to waste of production capacity

Method used

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  • Polypropylene microporous membrane and preparation method thereof
  • Polypropylene microporous membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Using a weight average molecular weight of 80% of the total weight fraction is 3.5×10 5 The polypropylene is the first component, and the weight average molecular weight of the total weight fraction of 20% is 5×10 4 The polypropylene is the second component. Wherein, in the first component, the molecular weight of less than 8% by weight of the first component is lower than 1×10 4 The low molecular weight fraction and less than 8% by weight of the first component have a molecular weight greater than 8×10 5 The high molecular weight fraction, the weight average molecular weight of the first component (M W ) and number average molecular weight (M n ) than M W / M n 4, viscosity average molecular weight (M v ) is 852000. In the second component, having less than 5% by weight of the second component, the molecular weight is less than 1×10 4 The low molecular weight fraction and less than 5% by weight of the second component have a molecular weight greater than 1×10 5...

Embodiment 2

[0032] Using a weight average molecular weight of 80% of the total weight fraction is 5×10 5 The polypropylene is the first component, and the weight average molecular weight of the total weight fraction of 20% is 5×10 4 The polypropylene is the second component. Wherein, in the first component, the molecular weight of less than 8% by weight of the first component is lower than 1×10 4 The low molecular weight fraction and less than 8% by weight of the first component have a molecular weight greater than 8×10 5 The high molecular weight fraction, the weight average molecular weight of the first component (M W ) and number average molecular weight (M n ) than M W / M n 6, viscosity average molecular weight (M v ) for 753000. In the second component, having less than 5% by weight of the second component, the molecular weight is less than 1×10 4 The low molecular weight fraction and less than 5% by weight of the second component have a molecular weight greater than 1×10 5 ...

Embodiment 3

[0034] Using a weight average molecular weight of 90% of the total weight fraction is 3.5×10 5 The polypropylene is the first component, and the weight average molecular weight of 10% of the total weight fraction is 5×10 4 The polypropylene is the second component. Wherein, in the first component, the molecular weight of less than 8% by weight of the first component is lower than 1×10 4 The low molecular weight fraction and less than 8% by weight of the first component have a molecular weight greater than 8×10 5 The high molecular weight fraction, the weight average molecular weight of the first component (M W ) and number average molecular weight (M n ) than M W / M n 4, viscosity average molecular weight (M v ) is 852000. In the second component, having less than 5% by weight of the second component, the molecular weight is less than 1×10 4 The low molecular weight fraction and less than 5% by weight of the second component have a molecular weight greater than 1×10 5...

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Abstract

The invention discloses a polypropylene microporous membrane and a preparation method and an application thereof. The polypropylene microporous membrane provided by the invention is composed of, by weight, 80-90% of a first component and 10-20% of a second component. The first component is polypropylene with weight average molecular weight of 2*10<5>-5*10<5>. The second component is polypropylene with weight average molecular weight of 5*10<4>-1*10<5>. According to the invention, the polypropylene microporous membrane is prepared from a mixed raw material of high-molecular-weight polypropylene and low-molecular-weight polypropylene, such that the micro-pore size and distribution of the polypropylene microporous membrane are uniform. Also, microporous membrane performances such as transverse and longitudinal tensile strength, puncture strength, porosity and thermal shrinkage reach good homogeneity. The polypropylene microporous membrane provided by the invention can satisfy applications with high requirements on microporous membrane pore-forming uniformity, and is especially suitable to be used in the field of battery separator.

Description

technical field [0001] The application relates to the field of battery separators, in particular to a polypropylene microporous membrane, a preparation method thereof, and applications of the polypropylene microporous membrane. Background technique [0002] Polyolefin microporous membrane material is an important new functional material, which is widely used in sewage purification, battery separator material, biomedical separation and so on. When applied to battery separator materials, it determines the interface structure and internal resistance of the battery, which directly affects the capacity, cycle and safety performance of the battery. A battery separator with excellent performance plays an important role in improving the overall performance of the battery. [0003] The preparation methods of polyolefin microporous membranes are mainly divided into wet phase separation and dry melt stretching. When dry stretching is used, the microscopic uniformity of polyolefin micro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/12C08L23/14C08L53/00C08L51/06B29C69/00B29C71/02H01M2/16
CPCY02E60/10
Inventor 于长溥涂婷曹志锋瞿威张辉
Owner SHENZHEN ZHONGXING NEW MATERIAL TECH CO LTD
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