Polypropylene hollow fiber microporous membrane and preparation method thereof

A technology of polypropylene and microporous membranes, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as low industrialization, low membrane water flux, and imperfect technology, and the method is simple , Uniform pore size distribution and large water flux

Active Publication Date: 2010-10-20
三泰(青岛)膜科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the thermally induced phase separation method in the prior art still has the disadvantages of low degree of industrialization and imperfect technology, that is, the water flux of the prepared membrane is low.
[0005] The Chinese patent whose authorized notification number is CN1156616C discloses a method for preparing polypropylene hollow fiber microporous membrane by thermal phase separation method. The method uses polypropylene as raw material, vegetable oil, liquid paraffin, diphenyl ether, and machine oil as diluents. Adipic acid and benzoic acid are used as additives, n-hexane, freon, 90# gasoline, and ethanol are used as extraction agents, and polypropylene hollow fiber microporous membranes are prepared through a series of steps of solution preparation, heating and spinning, cooling, extraction, and recovery of extraction agents , but this method has the disadvantages of low porosity, especially low water flux

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 40 grams of polypropylene with a weight average molecular weight of 400,000 and a melt index of 3, 3 grams of polyethylene glycol, 2.5 grams of isosorbide and 150 grams of diphenyl ether were fully stirred in a pressure vessel at 210 ° C to obtain a homogeneous casting solution. The pressure range of the container is -0.1Mpa~1MPa; the casting solution passes through a 1-meter-long uniform cooling pipe for 3 seconds, and cools down to 140°C, and then injects nitrogen into the outer gel medium through the spinneret with nitrogen as the inner gel medium, and the outer gel medium is coagulated The glue medium is vegetable oil, and the temperature is controlled at 55°C; the prepared membrane is immersed in the extract solution for 3 hours, wherein the concentration of ethanol in the extract solution is 85%, and the concentration of sulfuric acid is 2%. A polypropylene hollow fiber microporous membrane was obtained.

[0033] According to the conventional membrane performance ...

Embodiment 2

[0035] Using the casting solution formula of Example 1, the casting solution passes through a 1-meter-long uniform cooling pipeline for 5 seconds, then cools down to 120°C, then injects nitrogen into the outer gel medium through the spinneret with nitrogen as the inner gel medium, and externally coagulates. The gel medium is vegetable oil, and the temperature is controlled at 55°C; the prepared membrane is immersed in the extract for 3 hours, wherein the concentration of ethanol in the extract is 85%, and the concentration of sulfuric acid is 2%. After the membrane filaments are taken out and dried, the polypropylene hollow fiber microporous membrane is obtained.

[0036] According to the conventional membrane performance test method, the average pore size is 0.26 μm, the porosity is 68.5%, and the initial water flux is 1400L / (h·m2) at 0.1MPa. 2 ).

Embodiment 3

[0038] Using the casting liquid formula of Example 1, the film making and testing method of Example 1, wherein the inner gel medium is changed from nitrogen to diphenyl ether, and the temperature is 125°C. The measured average pore diameter is 0.45μm, the porosity is 78.5%, and the initial water flux is 2800L / (h·m at 0.1MPa 2 ).

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PUM

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Abstract

The invention discloses a polypropylene hollow fiber microporous membrane and a preparation method thereof. The hollow fiber microporous membrane comprises the following components in percentage by weight: 15-45% of polypropylene, 50-80% of thinner and 0.1-5% of additive. The preparation method of the hollow fiber microporous membrane is realized on the basis of a thermotropic phase separation process. The preparation method of the polypropylene hollow fiber microporous membrane is simple and easy to industrialize, and has low requirements on equipment, the prepared hollow fiber microporous membrane has the advantages of high strength, uniform pore diameter distribution, high porosity and the like, the pore diameter of the hollow fiber microporous membrane can be controlled between 0.1 and 0.45mu m, and the porosity is 60-85%, so the hollow fiber microporous membrane has large water flux, is not easy to block in use, can be widely used for feeding water treatment, and is particularly suitable for the membrane bioreactor technology and other water treatment fields.

Description

technical field [0001] The invention relates to a hollow fiber microporous membrane and a preparation method thereof, in particular to a polypropylene hollow fiber microporous membrane and a preparation method thereof. Background technique [0002] In recent years, microporous membrane technology has been successfully used for water treatment and various wastewater treatment, especially the membrane bioreactor technology (Membrane Bioreactor, referred to as MBR) that combines microporous membrane with biological aeration technology. Small footprint, energy saving, high utilization rate of sludge, so it has become a remarkable advanced technology at home and abroad, especially in groundwater treatment, food industry wastewater treatment, electronics industry wastewater treatment, chemical industry wastewater treatment and animal husbandry wastewater treatment, etc. have been successfully applied. In water treatment, especially in MBR applications, microporous membranes are r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/08B01D71/26B01D67/00
Inventor 李方鲲王效宁
Owner 三泰(青岛)膜科技有限公司
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