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Multilayer composite polypropylene microporous membrane, preparation method thereof and application

A polypropylene microporous film and multi-layer composite technology, which is applied in the direction of electrical components, circuits, battery components, etc., can solve the problems of uneven hole formation and uncontrollable size of microporous films, and achieve good safety and avoid Potential safety hazards, effects of improving tensile strength and puncture strength

Inactive Publication Date: 2019-05-24
武汉中兴创新材料技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The microporous film prepared by dry biaxial stretching technology has uneven pore formation, mainly due to the uncontrollable pore position and pore size during the conversion process of polypropylene from β crystal form to α crystal form

Method used

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  • Multilayer composite polypropylene microporous membrane, preparation method thereof and application
  • Multilayer composite polypropylene microporous membrane, preparation method thereof and application
  • Multilayer composite polypropylene microporous membrane, preparation method thereof and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The polyolefin microporous membrane preparation device of this example, wherein, the part that is used to prepare the middle layer of the multi-layer structure of micro-nano lamination, such as figure 1 As shown, it includes two extruders 1, co-extrusion module 5, micro-nano layer multiplier 2, extrusion die 3 and cooling traction module 4; wherein, two extruders 1 are used to extrude and prepare the middle layer respectively Two different specifications of polypropylene raw materials; the co-extrusion module 5 is set at the output port of the two extruders, and is used to merge and extrude the polyolefin materials extruded by the two extruders, and then transport them to the micro-nano layer The multiplier 2; the micro-nano layer multiplier 2 is a split-layer container as a whole, which is used to divide the molten polyolefin material extruded by the co-extrusion module 5 into several strands, and then each strand forms a layer, and finally forms several layers Laminat...

Embodiment 2

[0048] This example adopts the same device and method as in Example 1 to prepare a multilayer composite polypropylene microporous membrane. The difference is that the multilayer composite polypropylene microporous membrane of this example has an isotacticity of 98% and a melt index of Made of 1.3g / 10min polypropylene, the lower surface layer is made of polypropylene and the upper surface layer is the same, the isotacticity of the first polypropylene in the middle layer is 97%, the melt index is 0.8g / 10min, and the isotacticity of the second polypropylene is 98%, and the melt index is 1.3g / 10min. The middle layer is a cross-stacked 16-layer composite structure formed by 8-layer first polypropylene layer and 8-layer second polypropylene layer through micro-nano lamination technology. The preparation of the 16-layer stacked middle layer specifically uses three series-connected micro Nanolayer multiplier. The total thickness of the polyolefin microporous membrane of this example ...

Embodiment 3

[0051] This example adopts the same device and method as in Example 1 to prepare a multilayer composite polypropylene microporous membrane. It is made of 1.5g / 10min polypropylene, the lower surface layer is made of polypropylene and the upper surface layer is the same, the isotacticity of the first polypropylene in the middle layer is 98.5%, the melt index is 0.6g / 10min, and the isotacticity of the second polypropylene is 97%, the melt index is 1.5g / 10min. The middle layer is a cross-stacked 32-layer composite structure formed by micro-nano lamination technology with 16 layers of the first polypropylene layer and 16 layers of the second polypropylene layer. Four series-connected micro Nanolayer multiplier. The total thickness of the polyolefin microporous membrane of this example is 16 microns, the thickness of the upper surface layer is 2 microns, the thickness of the lower surface layer is 2 microns, the thickness of the middle layer is 12 microns, and the thickness of the ...

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Abstract

The present invention discloses a multilayer composite polypropylene microporous membrane, a preparation method thereof and application. The multilayer composite polypropylene microporous membrane ofthe present invention is composed of an upper surface layer, a middle layer and a lower surface layer; and the middle layer is of a multilayer structure formed by polypropylene layers through a micro-nano lamination technique. According to the multilayer composite polypropylene microporous membrane, the middle layer of the multilayer structure formed through the micro-nano lamination technique isadopted, and therefore, on the one hand, the multi-layer structure has better safety, and on the other hand, with the middle layer formed by the micro-nano lamination technique adopted, the tensile strength, puncture strength and other mechanical properties of the battery diaphragm can be improved, and the battery diaphragm can be thinner, and therefore, the requirements of the thin and high-safety lithium battery diaphragm for mechanical properties and safety can be satisfied.

Description

technical field [0001] The present application relates to the field of lithium-ion battery separators, in particular to a multilayer composite polypropylene microporous membrane and its preparation method and application. Background technique [0002] With the development of electric vehicles and energy storage industries, the requirements for lithium batteries are getting higher and higher, requiring lithium batteries to be safer and have higher energy density. The lithium battery separator is one of the most critical materials in the lithium battery, which directly affects the safety and energy density of the lithium battery. Therefore, the preparation of a safe, environmentally friendly, thin, and low-cost microporous membrane is a difficulty in the development of the lithium battery separator. At present, there are two methods of manufacturing lithium battery separators: wet method and dry method. Among them, the wet process needs to use a large amount of organic diluen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14
CPCY02E60/10
Inventor 王哲樊孝红黄子建郑君杰
Owner 武汉中兴创新材料技术有限公司
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