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Method for forming polyolefin microporous membrane and application thereof

A technology of polyolefin microporous film and polyolefin flow, which is applied in the field of polyolefin film manufacturing, and can solve problems such as difficulty in achieving air permeability

Inactive Publication Date: 2011-04-06
SHENZHEN SENIOR TECH MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the limitations of the current process, it is difficult to achieve better air permeability

Method used

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  • Method for forming polyolefin microporous membrane and application thereof
  • Method for forming polyolefin microporous membrane and application thereof
  • Method for forming polyolefin microporous membrane and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Homopolypropylene with a melt index of 3.0g / 10min was used, melted and extruded by a single-screw extruder, and cast into a thick film. The extrusion temperature was 220°C, the temperature of the casting roll was 60°C, and the thickness of the cast thick film was 30 μm. It was then heat-treated in an oven at 150°C for 10 hours. The cold drawing temperature is 20°C, the cold drawing ratio is 20%, the hot drawing temperature is 140°C, and the hot drawing ratio is 120%. The heat setting temperature is 140°C, and the heat setting time is 20s. The two corrugated rollers are located in the middle of the 6 sizing rollers, the corrugated rollers have H / R=0.35, and the transverse stretching ratio is 1.2 times to obtain the final PP microporous membrane.

Embodiment 2

[0040] Homopolypropylene with a melt index of 3.0g / 10min was used, melted and extruded by a single-screw extruder, and cast into a thick film. The extrusion temperature was 220°C, the temperature of the casting roll was 60°C, and the thickness of the cast thick film was 30 μm. Then heat treatment in an oven at 150°C for 10 hours. The cold drawing temperature is 25°C, the cold drawing ratio is 20%, the hot drawing temperature is 140°C, and the hot drawing ratio is 120%. The heat setting temperature is 140°C, and the heat setting time is 20s. The two corrugated rollers are located in the middle of the 6 sizing rollers, the corrugated rollers H / R=0.1, and the transverse stretching ratio is 1.1 times to obtain the final PP microporous membrane.

Embodiment 3

[0042] Homopolypropylene with a melt index of 3.0g / 10min was used, melted and extruded by a single-screw extruder, and cast into a thick film. The extrusion temperature was 220°C, the temperature of the casting roll was 60°C, and the thickness of the cast thick film was 30 μm. Then heat treatment in an oven at 150°C for 10 hours. The cold drawing temperature is 25°C, the cold drawing ratio is 20%, the hot drawing temperature is 140°C, and the hot drawing ratio is 120%. The heat setting temperature is 140°C, and the heat setting time is 20s. Two corrugated rollers are located in the middle of the 6 sizing rollers, the corrugated rollers have H / R=0.6, and the transverse stretching ratio is 1.3 times to obtain the final PP microporous membrane.

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Abstract

The invention provides a method for forming a polyolefin microporous membrane, which comprises the following steps of: performing melt extrusion and casting on polypropylene at the temperature of between 180 and 260 DEG C to obtain a polyolefin cast base membrane; longitudinally stretching the polyolefin cast base membrane at the temperature of between 10 and 150 DEG C to obtain a primary polyolefin microporous membrane with micropores; and performing heat setting treatment on the primary polyolefin microporous membrane at the temperature of between 110 and 150 DEG C, and transversely drawing the primary polyolefin microporous membrane to obtain the polyolefin microporous membrane. The invention also provides application of the method for forming the polyolefin microporous membrane in preparing a diaphragm or a lithium ion battery. In the method, based on the primary microporous membrane obtained by longitudinal stretching, the primary microporous membrane is transversely stretched at the predetermined temperature, and finally pores of the polyolefin microporous membrane become circular and are enlarged, so the air permeability of the polyolefin microporous membrane is improved, and the transverse strength of the microporous membrane is improved.

Description

technical field [0001] The invention belongs to the technical field of polyolefin film manufacture, and in particular relates to a method for forming a polyolefin microporous film and its application. Background technique [0002] At present, polyolefin film materials have been applied and developed more and more, and the most widely used one is as a diaphragm material for lithium-ion batteries, which has become one of the key inner components of lithium-ion batteries. The separator material has a crucial impact on the performance of the actual battery. The separator itself is not only a poor conductor of electrons, but also allows the passage of electrolyte ions. In addition, the separator material must also have good chemical and electrochemical stability and mechanical properties, and maintain a high degree of wettability to the electrolyte during repeated charge and discharge. The diaphragm is generally made of polypropylene or polyethylene plastic material, which can i...

Claims

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Application Information

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IPC IPC(8): B29D7/01B29C55/02B29C71/02H01M2/18H01M50/406
CPCY02E60/122B29K2105/041H01M10/052B29K2995/0051B29C55/143H01M2/145B29K2023/12B29C47/0019B29C47/0057B29C47/0021Y02E60/12B29K2023/10B29C55/005B29C48/07B29C48/08B29C48/0018Y02E60/10H01M50/406
Inventor 陈秀峰陈良雷彩红高东波
Owner SHENZHEN SENIOR TECH MATERIAL
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