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Method for polyolefin porous film mfg. method

A technology of microporous membrane and manufacturing method, applied in the direction of chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., to achieve the effects of reducing production costs, anti-acupuncture performance, and high strength

Inactive Publication Date: 2007-06-13
TIANJIN DG MEMBRANE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] So far, there is no report on the use of supercritical extraction to remove the first solvent to form pores in the process of thermally induced phase separation of polyolefin microporous membranes.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Method for producing ultra-high molecular weight polyethylene microporous membrane

[0029] Material formula:

[0030] Ultra-high molecular weight polyethylene (UHMWPE) with a weight average molecular weight (Mw) of 2.5 million: 25 parts; Diisodecyl phthalate (DIDP): 70 parts; Polyisobutylene PIB: 5 parts;

[0031] processing methods:

[0032] (1) Swell and mix the above raw materials at 95°C for 16 hours to prepare a uniform slurry; then input the slurry into a parallel co-rotating twin-screw extruder through a metering pump for melting and mixing, and set the temperature in each zone of the twin-screw to 170 , 180, 180, 180, 180, 180 ° C, the temperature of the melt gear pump is set to 180 ° C, the temperature of the die head is set to 180 ° C; the semi-finished product is cast into a film, and the thickness is controlled at 75-80 microns;

[0033] (2) Then supercritical extraction is adopted to the semi-finished product, and the extractant adopts refrigerant R22, a...

Embodiment 2

[0036] Method for producing ultra-high molecular weight polyethylene microporous membrane

[0037] The extraction agent uses refrigerant R125. The extraction agent is preheated by a 95°C preheater before entering the extraction kettle after pressurization. The heating temperature of the jacket of the extraction kettle shell is set at 95°C. After the kettle is boosted to 4MPa, close the extraction agent inlet shut-off valve and the high-pressure pump, continue heating the jacket of the extraction kettle shell for 15-60 minutes, then reopen the outlet pressure reducing valve, the extraction agent inlet shut-off valve, and turn on the high-pressure pump for continuous flow supercritical extraction 10-60min, the extraction operation pressure is controlled at 8MPa, and the extraction process temperature is 90°C; after the outlet pressure reducing valve of the extraction kettle, the mixed medium of the extraction agent and the first solvent is cooled by a cooler and then enters the s...

Embodiment 3

[0039] Production method of polypropylene microporous membrane

[0040] Material formula:

[0041] Polypropylene (PP 3271): 40 parts; Diisodecyl phthalate (DIDP): 55 parts; Polyisobutylene PIB: 5 parts;

[0042] processing methods:

[0043] (1) Mix the above raw materials at 110°C for 1-2 hours to prepare a uniform slurry; then input the slurry into a parallel co-rotating twin-screw extruder through a metering pump for melting and mixing, and set the temperature in each zone of the twin-screw to 180, 220, 210, 210, 210, 210°C, the temperature of the melt gear pump is set to 210°C, the temperature of the die head is set to 210°C; the semi-finished product is cast into a film, and the thickness is controlled at 30-35 microns;

[0044] (2) Then supercritical extraction is adopted to the semi-finished product, and the extractant adopts refrigerant R125, and the semi-finished product of polypropylene microporous membrane in roll and surface density 125g / m 2 The polypropylene non...

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Abstract

The present invention relates to a preparation method of polyolefine microporous membrane. Said invention adopts thermal phase separation process to prepare said polyolefine microporous membrane, said process includes the following steps: mixing polyolefine compound and first solvent, melting them by using extruder, extruding melt, cooling and forming to obtain a colloidal material, making said colloidal material undergo the processes of supercritical extraction, thermal stretching and setting so as to obtain the invented product.

Description

technical field [0001] The invention relates to a manufacturing method of a polyolefin microporous membrane, in particular to a supercritical extraction method for removing a first solvent to form pores during the manufacturing process of a polyolefin microporous membrane by thermally induced phase separation. technical background [0002] Polyolefin microporous membrane, with penetrating three-micro-network micropores, because polyolefin substrates are not easily soluble in organic solvents and conventional acids and alkalis at room temperature, microporous membranes can be used for battery separators, electrolytic capacitor separators, micro / ultrafiltration Precision filtration applications such as membranes; polyolefin microporous membranes are stable to organic electrolytes and electrode active materials in lithium-ion secondary batteries, and can also be widely used in lithium-ion secondary battery separators. [0003] At present, the methods for commercially producing ...

Claims

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Application Information

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IPC IPC(8): B01D71/26B01D67/00
Inventor 李鑫
Owner TIANJIN DG MEMBRANE
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