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Polyolefin microporous membrane preparation method and use

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

Active Publication Date: 2011-08-17
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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  • Polyolefin microporous membrane preparation method and use
  • Polyolefin microporous membrane preparation method and use
  • Polyolefin microporous membrane preparation method and use

Examples

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preparation example Construction

[0022] see figure 1 , showing the flow chart of the polyolefin microporous membrane preparation method of the embodiment of the present invention, including the following steps:

[0023] S01, melt extrusion, cast film formation: polyolefin is melt extruded at 180-260°C, and cast into a film to obtain a polyolefin cast base film;

[0024] S02, stretching and setting: stretching the polyolefin casting base film, and then performing heat setting treatment to obtain a preformed polyolefin microporous film;

[0025] S03, soaking treatment: soak the preformed polyolefin microporous membrane in an organic solvent with a surface tension lower than 30 mN / m, remove the organic solvent after soaking, and obtain the polyolefin microporous membrane.

[0026] In step S01, the polyolefin can be selected from but not limited to polypropylene, polyethylene, polytetramethylpentene or mixtures thereof. The polypropylene used may be homopolypropylene or copolypropylene, among which homopolyprop...

Embodiment 1

[0035] A homopolypropylene single-screw extruder with a melt index of 3.0 g / 10 min was used to extrude and cast a thick film, the extrusion temperature was 180° C., the temperature of the casting roll was 30° C., and the thickness of the tape-cast thick film was 40 microns. Then heat treatment at 110° C. for 10 hours in an oven. The cold drawing temperature is normal temperature, the cold drawing ratio is 20%, the hot drawing temperature is 110°C, and the hot drawing ratio is 120%. Carry out heat setting treatment again, heat setting temperature 110 ℃, heat setting time 20s. Then soak the film online in acetone for 5 minutes, leave the soaking solution, and dry the film at room temperature to obtain the final PP microporous film.

Embodiment 2

[0037] A homopolypropylene single-screw extruder with a melt index of 2.6 g / 10 min was used to extrude and cast a thick film, the extrusion temperature was 200° C., the temperature of the casting roll was 60° C., and the thickness of the tape-cast thick film was 40 microns. Then heat treatment in an oven at 150°C for 10 hours. The cold drawing temperature is normal temperature, the cold drawing ratio is 20%, the hot drawing temperature is 150°C, and the hot drawing ratio is 120%. Carry out heat setting treatment again, heat setting temperature 150 ℃, heat setting time 180s. Then soak the film online in acetone for 5 minutes, leave the soaking solution, and dry the film at 60°C to obtain the final PP microporous membrane.

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Abstract

The invention provides a polyolefin microporous membrane preparation method, which comprises the following steps: subjecting polyolefin to melt extrusion at 180 to 260 DEG C, and casting a membrane to obtain polyolefin cast base membrane; drawing the polyolefin cast base membrane, and performing heat setting treatment to obtain a preformed polyolefin microporous membrane; and soaking the preformed polyolefin microporous membrane in an organic solvent with a surface tension less than 30mN / m, soaking, removing the organic solvent and obtaining the polyolefin microporous membrane. The invention also provides the use of the polyolefin microporous membrane preparation method in the preparation of diaphragm or lithium ion batteries. In the preparation method, the preformed polyolefin microporous membrane formed by drawing and heat setting is soaked in the organic solvent with the surface tension less than 30mN / m, so the obtained polyolefin microporous membrane has rounder and bigger holes, the breathability is uniformly distributed along the transverse direction of the microporous membrane, and thus, the breathability of the microporous membrane is improved.

Description

technical field [0001] The invention belongs to the technical field of polyolefin films, and in particular relates to a preparation method and application of polyolefin microporous films. 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 isolate the po...

Claims

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Application Information

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IPC IPC(8): C08J7/02C08L23/00B29C55/04H01M2/16B29C48/92H01M50/403H01M50/406H01M50/417H01M50/489H01M50/491
CPCB29C47/0054Y02E60/12H01M10/0525B29K2105/041B29C2947/92704B29C47/0021B29C47/0057B29C47/92B29K2023/00H01M2/145H01M2/1653B29C51/00C08J9/28B29C55/005Y02E60/122B29C48/92B29C2948/92704B29C48/08B29C48/0017B29C48/0018Y02E60/10H01M50/417H01M50/406H01M50/491H01M50/489B29C55/02
Inventor 陈秀峰陈良雷彩红高东波陈勇
Owner SHENZHEN SENIOR TECH MATERIAL
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