Ethylene-vinyl alcohol copolymer hollow fiber microporous film and preparation method thereof

An ethylene vinyl alcohol and copolymer technology, which is applied in the field of hollow fiber microporous membrane and its preparation, can solve the problem that ethylene vinyl alcohol copolymer hollow fiber microporous membrane is rarely reported, and achieves simple method, convenient operation, and pore size distribution. uniform effect

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

[0007] However, in the prior art, there are few reports on the preparation of ethylene vinyl alcohol copolymer hollow fiber microporous membranes by thermally induced phase separation.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Fully stir 20 grams of ethylene vinyl alcohol copolymer, 50 grams of polyethylene glycol and 1.5 grams of polyvinyl alcohol in a pressure vessel at 200°C to obtain a homogeneous casting solution. The pressure range of the pressure vessel is -0.1Mpa to 1MPa. The ethylene The ethylene content in the vinyl alcohol copolymer is 40%; the casting solution is uniformly cooled through a 1.2-meter-long pipeline for 3.5 seconds, and the temperature is lowered to 135°C, and then mixed with the inner gel medium polyethylene glycol with a temperature of 120°C and a concentration of 70%. The alcohol is injected into the outer gel medium polyethylene glycol with a temperature of 65°C and a concentration of 70% through the spinneret; the prepared film is immersed in ethanol with a concentration of 25% for extraction for 3 hours, and the film filament is taken out and dried in the air. The ethylene vinyl alcohol copolymer hollow fiber microporous membrane is prepared.

[0033] According...

Embodiment 2

[0035] Using the casting solution formula of Example 1, the casting solution is uniformly cooled through a 1.5-meter-long pipeline for 5 seconds, and then cooled to 120°C, and then mixed with polyethylene glycol as an inner gel medium with a temperature of 100°C and a concentration of 80%. The external gel medium polyethylene glycol with a temperature of 45° C. and a concentration of 80% was injected through the spinneret; the prepared film was immersed in ethanol with a concentration of 55% for 3 hours for extraction. After taking out the membrane thread and drying it, the ethylene vinyl alcohol hollow fiber microporous membrane is obtained.

[0036] According to the conventional membrane performance test method, the average pore size is 0.17 μm, the porosity is 68%, and the initial pure water flux is 2100 L / (h m 2 ).

Embodiment 3

[0038] Using the formulation of the casting solution in Example 1, the casting solution is uniformly cooled through a 3-meter-long pipeline for 10 seconds, and then cooled to 100°C, and then mixed with the inner gel medium polyethylene glycol with a temperature of 85°C and a concentration of 60%. The outer gel medium polyethylene glycol with a temperature of 45°C and a concentration of 40% was injected through the spinneret; the prepared film was immersed in ethanol with a concentration of 45% for 3 hours. After taking out the membrane thread and drying it, the ethylene vinyl alcohol hollow fiber microporous membrane is obtained.

[0039] According to the conventional membrane performance test method, the average pore size is 0.11 μm, the porosity is 65%, and the initial pure water flux is 1700L / (h·m2) at 0.1MPa.

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Abstract

The invention discloses an ethylene-vinyl alcohol copolymer hollow fiber microporous film and a preparation method thereof. The hollow fiber microporous film of the invention comprises the following components in percentage by weight: 25 to 60 percent of ethylene-vinyl alcohol copolymer, 40 to 75 percent of thinner and 0 to 15 percent of additive. The preparation method for the hollow fiber microporous film is implemented on the basis of a thermally induced phase separation process. The hollow fiber microporous film prepared by the preparation method has the characteristics of high strength, uniform pore size distribution, high porosity and the like; the pore size of the hollow fiber microporous film is of between 0.1 and 0.5 mu m generally; and the porosity is of between 40 and 75 percent. Therefore, the hollow fiber microporous film of the invention has the characteristics of high water flux and not easy fouling when in use, and can be widely used in membrane bioreactors 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 an ethylene vinyl alcohol copolymer hollow fiber microporous membrane and a preparation method thereof. Background technique [0002] Polymer separation membranes can be divided into dense membranes, porous membranes, and ion exchange membranes according to their structures. Porous membranes can be used to trap colloidal particles, bacteria, high molecular weight particles, etc. The microporous membrane is a porous membrane with a pore diameter between 0.02 μm and 10 μm. [0003] In recent years, microporous membrane technology has been successfully used in the treatment of various wastewater, especially the membrane bioreactor technology (Membrane Bioreactor, referred to as MBR) that combines microporous membrane with biological aeration technology. Small size, energy saving, and high sludge utilization rate, so it has become an advanced t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/38B01D69/08B01D67/00
Inventor 李方鲲王效宁
Owner 三泰(青岛)膜科技有限公司
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