High-flux virus-removing polyvinylidene fluoride hollow fiber microporous membrane and preparation method thereof

A polyvinylidene fluoride, high-flux technology, used in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc. To achieve the effect of expanding the effective filtration area, providing strength, and improving the flux of pure water

Active Publication Date: 2020-08-14
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 t

Method used

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  • High-flux virus-removing polyvinylidene fluoride hollow fiber microporous membrane and preparation method thereof
  • High-flux virus-removing polyvinylidene fluoride hollow fiber microporous membrane and preparation method thereof
  • High-flux virus-removing polyvinylidene fluoride hollow fiber microporous membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0037] Example 1

[0038] (1) Preparation of film casting liquid: diluent and polyvinylidene fluoride copolymer, wherein the mass concentration of polyvinylidene fluoride copolymer is 25wt%, diethyl phthalate as the diluent, the mass percentage concentration is 75wt%, and the temperature is increased. At 220°C, stand for degassing and mixing evenly to obtain a casting liquid.

[0039] (2) Extrusion of hollow fiber membrane: The casting liquid is further sheared and melted at high temperature through a twin-screw extruder, and finally merged with the inner core liquid and the outer spray layer at the spinneret. One pass is extruded through the spinneret to form a hollow fiber-like homogeneous high-temperature casting solution with a high-temperature core liquid in the inner cavity and a low-temperature spray layer around the outside. The outer spray consisted of 20% ethanol and 80% water at 7°C. The inner core liquid is glycerol.

[0040] (3) Outer layer spray-solvent exchan...

Example Embodiment

[0045] Example 2:

[0046] (1) Preparation of casting liquid: diluent and polyvinylidene fluoride copolymer, wherein the mass concentration of polyvinylidene fluoride copolymer is 20wt%, and the mass concentration of diethyl phthalate as the diluent is 80wt%, and the temperature is increased to 220 ° C, stand for degassing and mixing to obtain a casting liquid.

[0047] (2) Extrusion of hollow fiber membrane: The casting liquid is further sheared and melted at high temperature through a twin-screw extruder, and finally merged with the inner core liquid and the outer spray layer at the spinneret. One pass is extruded through the spinneret to form a hollow fiber-like homogeneous high-temperature casting solution with a high-temperature core liquid in the inner cavity and a low-temperature spray layer around the outside. The outer spray was composed of 20% ethanol and 80% water at a temperature of 10°C. The inner core liquid is 1,2-propanediol.

[0048] (3) Outer layer spray-s...

Example Embodiment

[0053] Example 3:

[0054] (1) Preparation of casting liquid: diluent and polyvinylidene fluoride copolymer, wherein the mass concentration of polyvinylidene fluoride copolymer is 30wt%, and the mass concentration of diethyl phthalate as diluent is 70wt%, and the temperature is increased to 220℃, stand for degassing and mixing to obtain casting liquid;

[0055] (2) Extrusion of hollow fiber membrane: The casting liquid is further sheared and melted at high temperature through a twin-screw extruder, and finally merged with the inner core liquid and the outer spray layer at the spinneret. One pass is extruded through the spinneret to form a hollow fiber-like homogeneous high-temperature casting solution with a high-temperature core liquid in the inner cavity and a low-temperature spray layer around the outside. The outer spray consisted of 20% ethanol and 80% water at 5°C. The inner core liquid is composed of glycerol and 2,3-butanediol mixed in any proportion.

[0056] (3) O...

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Abstract

The invention relates to a high-flux virus-removing polyvinylidene fluoride hollow fiber microporous membrane with a multi-layer filtering structure and a preparation method thereof. In order to improve the virus interception performance and the pure water flux of the hollow fiber microporous membrane, the polyvinylidene fluoride hollow fiber microporous membrane disclosed by the invention has theadvantages that the outer diameter of membrane filaments is 1.1-1.4 mm, the inner diameter is 0.6-0.8 mm, and the wall thickness is 0.2-0.4 mm, obvious holes are formed in the outer surfaces of the membrane filaments, and a three-layer film pore structure layer with a remarkable boundary is formed from outside to inside. The preparation method comprises the following steps: preparing a membrane casting solution, extruding a hollow fiber membrane, spraying a solvent on the outer layer and exchanging to form a film, performing low-temperature split-phase film forming on the middle layer, carrying out inner-layer low-temperature split-phase film formation and carrying out extraction. The method is based on a thermally induced phase separation membrane preparation method, technologies such asshallow solvent-non-solvent rapid exchange film formation and graded temperature gradient split-phase pore formation are combined, the hollow fiber membrane with the three-layer pore structure, whichhas obvious different boundaries, is prepared by using the method disclosed by the invention, on the premise of ensuring large filtration flux, efficient multi-layer filtration can be formed on pathogenic microorganisms such as viruses, the interception performance reaches 99.99%, and the average interception rate detected by a third party reaches 99.999%.

Description

technical field [0001] The invention relates to a hollow fiber microporous membrane, in particular to a polyvinylidene fluoride (PVDF) hollow fiber microporous membrane with a multi-layer filtration structure and a high-efficiency virus-removing structure and a preparation method thereof. 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 virus remov...

Claims

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Application Information

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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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