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 t

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0027] Example 1:

[0028] Manufacturing method of 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) above-mentioned raw material is first carried out 95 ℃ of swelling and mixing treatment for 16 hours, and is prepared into uniform slurry; then by metering pump, the slurry is input into a parallel co-rotating twin-screw extruder for melting and kneading, and the temperature of each zone of the twin-screw is set to 170 ℃ , 180, 180, 180, 180, 180 ℃, the temperature of the melt gear pump is set to 180 ℃, the temperature of the die head is set to 180 ℃; the semi-finished product is cast film, and the thickness is controlled to 75-80 microns;

[0033] (2) Then use supercritical extraction on the semi-fin...

Example Embodiment

[0035] Example 2:

[0036] Manufacturing method of ultra-high molecular weight polyethylene microporous membrane

[0037] The extraction agent adopts 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 jacket of the extraction kettle is set to 95°C, and the heated R125 extractant is pumped into the extraction kettle. After the pressure of the kettle is increased to 4MPa, close the extraction agent inlet stop valve and high-pressure pump, and continue to heat the jacket of the extraction kettle for 15-60 minutes, then reopen the outlet pressure reducing valve, the extraction agent inlet stop 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 m...

Example Embodiment

[0038] Example 3:

[0039] Manufacturing 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) The above-mentioned raw materials are first mixed at 110°C for 1-2 hours to prepare a uniform slurry; then the slurry is input into a parallel co-rotating twin-screw extruder through a metering pump for melting and kneading, and the temperature of each zone of the twin-screw is set to 180, 220, 210, 210, 210, 210 °C, the temperature of the melt gear pump is set to 210 °C, and the temperature of the die head is set to 210 °C; the semi-finished product is cast film, and the thickness is controlled to 30-35 microns;

[0044] (2) Then use supercritical extraction on the semi-finished product, and use refrigerant R125 as the extractant. 2 The polypropylene non-woven fabric is compounded and put into a 260L high-pre...

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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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