A kind of preparation method of polyvinylidene fluoride hollow fiber hollow fiber microporous membrane with large flux removal virus

A polyvinylidene fluoride, high-flux technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as reduced virus retention performance, low pure water flux, and impact on water safety. Expand the effective filtration area, improve the flux of pure water, and improve the removal rate

Active Publication Date: 2021-11-12
BEIJING SCINO MEMBRANCE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to overcome the significant decrease in virus interception performance caused by the abrasion of the filter layer on the surface of the membrane in the prior art, or the fact that the porosity is too high to effectively intercept the virus, which affects the safety of the water body, and the pure water flux is low and the preparation method is complicated. to provide a method for preparing a polyvinylidene fluoride hollow fiber microporous membrane with high throughput and high efficiency for virus removal

Method used

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  • A kind of preparation method of polyvinylidene fluoride hollow fiber hollow fiber microporous membrane with large flux removal virus
  • A kind of preparation method of polyvinylidene fluoride hollow fiber hollow fiber microporous membrane with large flux removal virus
  • A kind of preparation method of polyvinylidene fluoride hollow fiber hollow fiber microporous membrane with large flux removal virus

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Experimental program
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Effect test

Embodiment 1

[0037] (1) Preparation of casting solution: diluent and polyvinylidene fluoride copolymer, wherein the mass concentration of polyvinylidene fluoride copolymer is 25wt%, and diethyl phthalate as diluent, the mass percentage concentration is 75wt%, and the temperature is raised to 220°C, stand still for degassing and mix uniformly to obtain a casting solution.

[0038] (2) Extrusion of hollow fiber membrane: The casting solution is further sheared and melted at high temperature through a twin-screw extruder, and finally merged with the inner core solution and the outer spray layer at the spinneret. One is extruded through the spinneret to form a hollow fiber-shaped homogeneous high-temperature casting film solution with a high-temperature core liquid in the inner cavity and a low-temperature spray layer around the outside. The outer spray consists of 20% ethanol and 80% water at a temperature of 7°C. The core liquid is glycerol.

[0039] (3) Outer layer spray-solvent exchange ...

Embodiment 2

[0045] (1) Preparation of casting solution: diluent and polyvinylidene fluoride copolymer, wherein the mass concentration of polyvinylidene fluoride copolymer is 20wt%, diethyl phthalate as diluent, mass concentration is 80wt%, and the temperature is raised to At 220°C, let stand to defoam and mix evenly to obtain a casting solution.

[0046] (2) Extrusion of hollow fiber membrane: The casting solution is further sheared and melted at high temperature through a twin-screw extruder, and finally merged with the inner core solution and the outer spray layer at the spinneret. One is extruded through the spinneret to form a hollow fiber-shaped homogeneous high-temperature casting film solution with a high-temperature core liquid in the inner cavity and a low-temperature spray layer around the outside. The outer spray consists of 20% ethanol and 80% water at a temperature of 10°C. The core fluid is 1,2-propanediol.

[0047] (3) Outer layer spray-solvent exchange film formation: th...

Embodiment 3

[0053] (1) Preparation of casting solution: diluent and polyvinylidene fluoride copolymer, wherein the mass concentration of polyvinylidene fluoride copolymer is 30wt%, diethyl phthalate as diluent, mass concentration is 70wt%, and the temperature is raised to 220°C, stand still for defoaming and mix evenly to obtain casting solution;

[0054] (2) Extrusion of hollow fiber membrane: The casting solution is further sheared and melted at high temperature through a twin-screw extruder, and finally merged with the inner core solution and the outer spray layer at the spinneret. One is extruded through the spinneret to form a hollow fiber-shaped homogeneous high-temperature casting film solution with a high-temperature core liquid in the inner cavity and a low-temperature spray layer around the outside. The outer spray consists of 20% ethanol and 80% water at a temperature of 5°C. The inner core fluid is composed of glycerol and 2,3-butanediol mixed in any proportion.

[0055] (3)...

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Abstract

The invention relates to a preparation method of a polyvinylidene fluoride hollow fiber microporous membrane with a large flux and high efficiency virus removal with a multi-layer filtration structure. In order to improve the virus interception performance and pure water flux of the hollow fiber microporous membrane, the polyvinylidene fluoride hollow fiber microporous membrane of the present invention has an outer diameter of 1.1-1.4 mm, an inner diameter of 0.6-0.8 mm, and a wall thickness of 0.2-0.4 mm. ; The outer surface of the membrane filament has obvious openings; a three-layer membrane pore structure layer with a significant boundary is formed from the outside to the inside. The preparation method includes: preparing casting liquid; extrusion of hollow fiber membrane; outer layer spraying solvent exchange film formation; middle layer low temperature phase separation film formation; inner layer low temperature phase separation film formation; extraction. Based on the thermally induced phase separation membrane-making method, combined with technologies such as shallow solvent-non-solvent rapid exchange membrane formation, hierarchical temperature gradient phase separation and pore formation, the hollow fiber with a three-layer pore structure with distinct boundaries is prepared Under the premise of ensuring a large filtration flux, the membrane can form high-efficiency multi-layer filtration for pathogenic microorganisms such as viruses, with a retention performance of 99.99%, and the average retention rate of third-party testing has reached 99.999%.

Description

technical field [0001] The invention relates to a method for preparing a hollow fiber membrane, in particular to a method for preparing a polyvinylidene fluoride (PVDF) hollow fiber microporous membrane with a multi-layer filtration structure with large flux and high efficiency for virus removal. Background technique [0002] Pathogenic microorganisms refer to pathogenic bacteria, viruses and protozoa (protozoa and worms) widely present in water bodies, which can cause gastroenteritis, diarrhea, dysentery, hepatitis, cholera, typhoid and other diseases. Therefore, controlling the risk of pathogenic microorganisms in drinking water is the top priority of drinking water safety. Among all pathogenic microorganisms, viruses tend to cause more serious consequences, but due to their smaller size, ranging from about 20 to 300nm, viruses are also more difficult to deal with. The drinking water quality standards of the United States, Canada and other countries stipulate that the vir...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/34B01D69/02B01D67/00
CPCB01D67/0002B01D67/0013B01D67/0088B01D69/02B01D71/34
Inventor 田野金宇涛林亚凯吴红梅
Owner BEIJING SCINO MEMBRANCE TECH
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