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A large-flux antifouling polyvinylidene fluoride hollow fiber microfiltration membrane and its preparation method

A technology of polyvinylidene fluoride and polyvinylidene fluoride resin, which is applied in the field of polyvinylidene fluoride hollow fiber microfiltration membrane and its preparation, can solve problems such as inability to meet the use requirements, and achieve excellent chemical resistance and anti-fouling The effect of good sex and enhanced hydrophilicity

Active Publication Date: 2016-03-02
GUANGZHOU CHAOYU MEMBRANE SEPARATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it cannot meet the requirements of today's use

Method used

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  • A large-flux antifouling polyvinylidene fluoride hollow fiber microfiltration membrane and its preparation method
  • A large-flux antifouling polyvinylidene fluoride hollow fiber microfiltration membrane and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Mix 8% polyvinylidene fluoride, 82% organic solvent, 4% organic additive, and 6% hydrophilic additive, stir for 6 hours, homogenize and dissolve at 50°C to make a casting solution, and vacuum defoam at room temperature for 6 Hours, using the phase inversion method, the conditions are: the air dry distance is 5cm, the nitrogen pressure is 0.3MPa, the spinning speed is 6m / min; the coagulation bath is deionized water with a water temperature of 20°C, and the core liquid is any solution; the reaction temperature The temperature is 20°C, and the humidity is 40%, to prepare a large-flux antifouling polyvinylidene fluoride hollow fiber microfiltration membrane. It has been determined that the flux of pure water at 0.1MPa and 25°C is 1150L / (m 2 h).

Embodiment 2

[0026] Mix 10% polyvinylidene fluoride, 80% organic solvent, 6% organic additive, and 4% hydrophilic additive, stir for 10 hours, homogenize and dissolve at 45°C to make a casting solution, and vacuum defoam at room temperature for 8 Hours, using the phase inversion method, the conditions are: the air dry distance is 10cm, the nitrogen pressure is 0.3MPa, the spinning speed is 12m / min; the coagulation bath is deionized water with a water temperature of 40°C, and the core liquid is any solution; the reaction temperature The temperature is 40°C, and the humidity is 80%, to prepare a large-flux antifouling polyvinylidene fluoride hollow fiber microfiltration membrane. It has been determined that the flux of pure water at 0.1MPa and 25°C is 1250L / (m 2 h).

Embodiment 3

[0028] Mix 12% polyvinylidene fluoride, 78% organic solvent, 7% organic additive, and 3% hydrophilic additive, stir for 12 hours, homogenize and dissolve at 55°C to make a casting solution, and vacuum defoam at room temperature for 8 Hours, using the phase inversion method, the conditions are: the air dry distance is 8cm, the nitrogen pressure is 0.3MPa, the spinning speed is 12m / min; the coagulation bath is deionized water with a water temperature of 30°C, and the core liquid is any solution; the reaction temperature is 30 DEG C and 60% humidity to prepare a large-flux antifouling polyvinylidene fluoride hollow fiber microfiltration membrane. It has been determined that the flux of pure water at 0.1MPa and 25°C is 1580L / (m 2 h).

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Abstract

The invention relates to a large-flux anti-fouling polyvinylidene fluoride hollow fiber microfiltration membrane and a preparation method thereof. The membrane is prepared from a macromolecular material, an organic solvent, an organic additive and a hydrophilic additive, and comprises the following raw materials by the mass percentage: 8-16% of polyvinylidene fluoride resin, 74-82% of the organic solvent, 4-8% of the organic additive, and 2-6% of the hydrophilic additive. The preparation method comprises the steps of mixing the macromolecular material, the organic additive and the hydrophilic additive in the organic solvent, stirring, homogenizing and dissolving to obtain a membrane casting solution, carrying out vacuum defoaming at the room temperature, and employing a phase conversion method to obtain. The hollow fiber microfiltration membrane has excellent chemical tolerance, and has good membrane performance and structure, smooth and flat membrane surface, good toughness, high mechanical strength, good hydrophilicity, large water flux, and good fouling resistance. The preparation method of the membrane is simple, enables the membrane pore size to be controllable, and is applicable to current wastewater treatment, industrial wastewater treatment, intermediate water reuse, rural drinking water and other practical applications.

Description

technical field [0001] The invention relates to membrane separation technology, in particular to a polyvinylidene fluoride hollow fiber microfiltration membrane with large flux and high pollution resistance and a preparation method thereof. Background technique [0002] Polyvinylidene fluoride (PVDF) has excellent properties such as high strength corrosion resistance, chemical resistance, high temperature resistance, and oxidation resistance. Due to its good flexibility, PVDF has been widely used to prepare hollow fiber microfiltration membrane materials. The chemical properties of PVDF are stable, but due to its strong hydrophobicity, it is very difficult to functionalize PVDF membranes. U.S. Patent No. 5,022,990 discloses a method for preparing polyvinylidene fluoride porous membranes. The method is to blend organic liquid and inorganic pellets in the casting solution, and then make hollow fiber membranes from the resulting blended casting solution. , the porous membrane ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/34B01D67/00B01D69/08B01D69/02
Inventor 徐祖亮
Owner GUANGZHOU CHAOYU MEMBRANE SEPARATION TECH