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Polyvinylidene fluoride ultrafiltration membrane and preparation method thereof

A polyvinylidene fluoride and ultrafiltration membrane technology, applied in the field of membrane separation, can solve the problems of affecting membrane flux, poor membrane hydrophilicity, poor membrane anti-pollution characteristics, etc., to increase hydrophilic groups and improve dispersion performance , increase the effect of permeability

Inactive Publication Date: 2021-04-06
XINJIANG DELAND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, there are some problems in the current application of polyvinylidene fluoride ultrafiltration membranes: PVDF itself has strong hydrophobicity, and general pollutants, including proteins, colloids, etc., are also hydrophobic, and pollutants are more likely to adhere tightly to the membrane surface. Backwashing cannot restore the flux of the membrane, and high-frequency chemical cleaning is required, so the anti-pollution characteristics of the membrane are poor; at the same time, the poor hydrophilicity of the membrane also directly affects the membrane flux, water production performance, and chemical cleaning. Flux recovery, membrane operation and maintenance costs and service life, etc.
These problems restrict the application of PVDF membranes in aqueous phase separation systems

Method used

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  • Polyvinylidene fluoride ultrafiltration membrane and preparation method thereof
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The following raw materials were weighed in parts by mass: 15 parts of PVDF resin, 2 parts of 2,2-dimethylolpropionic acid, 54 parts of nitrogen nitrogen dimethylacetamide, 5 parts of polyethylene glycol, polyoxyethylene sorbitan 1 part of monolaurate, 4 parts of sodium chloride, 5 parts of polyethyleneimine.

[0041] Dissolve 2,2-dimethylolpropionic acid in a small amount of ethanol, stir at 30°C for 5 minutes, and wait until it is uniformly dissolved for later use.

[0042] Pour nitrogen nitrogen dimethylacetamide into the reaction kettle, heat up to 70°C, add polyethylene glycol, stir at 10Hz for 5min; add polyoxyethylene sorbitan monolaurate, stir at 10Hz for 5min; Then add sodium chloride, stir at 20 Hz for 30 min; finally add PVDF resin and stir at 10 Hz for 30 min, and continue stirring at 20 Hz for 6 h. A homogeneous casting solution is formed.

[0043] Vacuum defoaming of the casting solution in the above steps for 10 hours at 50°C, and vacuum degassing of th...

Embodiment 2

[0047]Weigh the following raw materials in parts by mass: 17 parts of PVDF resin, 2 parts of 2,2-dimethylolpropionic acid, 59 parts of nitrogen nitrogen dimethylacetamide, 8 parts of hydrophilic agent, polyoxyethylene sorbitan mono 1 part of stearate, 5 parts of lithium chloride, 8 parts of polyethyleneimine.

[0048] Dissolve 2,2-dimethylolpropionic acid in a small amount of ethanol, stir at 40°C for 10 minutes, and wait until it is uniformly dissolved for later use.

[0049] Pour nitrogen nitrogen dimethylacetamide into the reaction kettle, heat up to 90°C, add hydrophilic agent, stir at 20Hz for 10min; add polyoxyethylene sorbitan monostearate, stir at 20Hz for 10min; Then add lithium chloride, stir at 30Hz for 60min; finally add PVDF resin and stir at 20Hz for 60min, and continue stirring at 30Hz for 10h. A homogeneous casting solution is formed.

[0050] Vacuum defoaming of the casting solution in the above steps for 10 hours at 80°C, and vacuum degassing of the core so...

Embodiment 3

[0055] Weigh the following raw materials in parts by mass: 18 parts of PVDF resin, 2 parts of 2,2-dimethylol butyric acid, 63 parts of nitrogen nitrogen dimethylformamide, 10 parts of absolute ethanol, polyoxyethylene sorbitan mono 2 parts of palmitate, 5 parts of calcium chloride, 10 parts of polyethyleneimine.

[0056] Dissolve 2,2-dimethylolbutyric acid in a small amount of ethanol, stir at 35°C for 7 minutes, and wait for uniform dissolution before use.

[0057] Pour nitrogen nitrogen dimethylformamide into the reaction kettle, heat up to 80°C, add absolute ethanol, stir at 15Hz for 7min; add polyoxyethylene sorbitan monopalmitate, stir at 15Hz for 7min; Add calcium chloride, stir at 15Hz for 7min; finally add PVDF resin and stir at 15Hz for 45min, and continue stirring at 25Hz for 8h. A homogeneous casting solution is formed.

[0058] Vacuum defoaming of the casting solution in the above steps for 13 hours at 65°C, and vacuum degassing of the core solution at 45°C for 6...

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Abstract

The invention provides a polyvinylidene fluoride ultrafiltration membrane and a preparation method thereof. The polyvinylidene fluoride ultrafiltration membrane is prepared from the following raw materials in parts by mass: 15-22 parts of PVDF resin, 2-3 parts of a modifier, 54-73 parts of a solvent, 5-15 parts of a hydrophilic agent, 1-2 parts of a surfactant, 4-7 parts of a pore-foaming agent, 5-15 parts of a cross-linking agent, core liquid and ethanol. The polyvinylidene fluoride ultrafiltration membrane provided by the invention has high hydrophilicity and continuous anti-pollution performance.

Description

technical field [0001] The invention relates to the technical field of membrane separation, in particular to a polyvinylidene fluoride ultrafiltration membrane and a preparation method thereof. Background technique [0002] Polyvinylidene fluoride resin is widely used in the preparation of ultrafiltration membranes due to its excellent chemical stability and heat resistance. Its structure includes hollow fiber type, roll type, etc., and the hollow fiber type has a higher specific surface area. , filling density and easy packaging advantages, so as to get a wide range of production applications. At present, polyvinylidene fluoride hollow fiber ultrafiltration membranes are mainly used in municipal waterworks, advanced treatment of sewage plants, industrial wastewater treatment and reuse, and seawater or brackish water desalination reverse osmosis pretreatment and other fields. [0003] However, there are some problems in the current application of polyvinylidene fluoride ult...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D69/08B01D69/02B01D67/00
CPCB01D71/34B01D69/08B01D69/02B01D67/0002
Inventor 曾凡付许白羽钱铖廖香红
Owner XINJIANG DELAND
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