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Polyvinylidene fluoride ultrafiltration membrane surface modification method

A polyvinylidene fluoride and surface modification technology, applied in ultrafiltration, chemical instruments and methods, membrane technology, etc., can solve the problems of unmentioned resistance of polyvinylidene fluoride ultrafiltration membrane, and improve the anti-pollution performance. , the effect of improving anti-pollution performance and low cost

Active Publication Date: 2018-02-16
RUYUAN DONGYANG LIGHT FLUORINE RESIN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the patent does not mention the resistance of the modified polyvinylidene fluoride ultrafiltration membrane to metal ions

Method used

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  • Polyvinylidene fluoride ultrafiltration membrane surface modification method
  • Polyvinylidene fluoride ultrafiltration membrane surface modification method
  • Polyvinylidene fluoride ultrafiltration membrane surface modification method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1) Self-made PVDF hollow fiber ultrafiltration membrane by wet spinning;

[0035] 2) Immerse the PVDF hollow fiber ultrafiltration membrane in NaOH / KMnO 4 =8 / 1 in the aqueous solution (mass fraction is 36%), react 90min at 50 ℃;

[0036] 3) Immerse the PVDF membrane prepared in step 2) into NaHSO 3 / H 2 SO 4 =1 / 1 in the aqueous solution (mass fraction is 4%), react 30min at room temperature;

[0037] 4) Finally, immerse the PVDF membrane prepared in step 3) in poly(N-(N-(2-aminoethyl)-2-aminoethyl)aspartic acid) / SOCl 2 =1 / 1 aqueous solution (mass fraction 36%), sulfonamide reaction occurs at room temperature for 90 minutes, and the pH value is adjusted at about 7.0 to obtain a positively charged PVDF hollow fiber ultrafiltration membrane on the surface.

Embodiment 2

[0039] 1) Self-made PVDF hollow fiber ultrafiltration membrane by wet spinning;

[0040] 2) Immerse the PVDF hollow fiber ultrafiltration membrane in NaOH / KMnO 4 In the aqueous solution (mass fraction 36%) of =8 / 1, react 90min at 50 ℃;

[0041] 3) Immerse the PVDF membrane prepared in step 2) into NaHSO 3 / H 2 SO 4 =1 / 1 in the aqueous solution (mass fraction is 4%), react 30min at room temperature;

[0042] 4) Finally, immerse the PVDF membrane prepared in step 3) into poly-L-lysine / SOCl 2 =1 / 1 aqueous solution (mass fraction is 36%), sulfonamide reaction occurs at room temperature for 90min, and the pH value is adjusted at about 7.0 to obtain a positively charged PVDF hollow fiber ultrafiltration membrane on the surface.

Embodiment 3

[0044] 1) Self-made PVDF hollow fiber ultrafiltration membrane by wet spinning;

[0045] 2) Immerse the PVDF hollow fiber ultrafiltration membrane in NaOH / KMnO 4 =8 / 1 in the aqueous solution (mass fraction is 36%), react 90min at 50 ℃;

[0046] 3) Immerse the PVDF membrane prepared in step 2) into NaHSO 3 / H 2 SO 4 =1 / 1 in the aqueous solution (mass fraction is 4%), react 30min at room temperature;

[0047] 4) Finally, immerse the PVDF membrane prepared in step 3) into poly(2-aminoethyl methacrylate) / SOCl 2 =1 / 1 aqueous solution (mass fraction is 36%), sulfonamide reaction occurs at room temperature for 90min, and the pH value is adjusted at about 7.0 to obtain a positively charged PVDF hollow fiber ultrafiltration membrane on the surface.

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Abstract

The invention relates to a polyvinylidene fluoride ultrafiltration membrane surface modification method, and the method comprises: performing alkaline treatment on a PVDF ultrafiltration membrane to form carbon-carbon double bonds on the surface of the PVDF membrane, and then carrying out negative charge treatment to obtain a PVDF membrane with SO3<-> ions on the surface, and finally performing asulfonamidation reaction to obtain a surface-modified PVDF membrane. The PVDF ultrafiltration membrane obtained by the modification method provided by the invention has a large amount of positive charges on the surface and has a desalination rate (resistance to metal ions) being at least 6 times of the desalination rate of an unmodified PVDF ultrafiltration membrane, the membrane antipollution performance is obviously improved, the service life is longer, and the modification method has the advantages of low cost, space saving, simple method and industrialization easiness.

Description

technical field [0001] The invention relates to the field of membrane technology, in particular to a method for modifying the surface of a polyvinylidene fluoride (PVDF) ultrafiltration membrane. Background technique [0002] Membrane separation technology is an efficient, environmentally friendly and energy-saving separation method, including reverse osmosis (RO), nanofiltration (NF), microfiltration (MF), ultrafiltration (UF) and other technologies, which are widely used in seawater desalination, sewage In the fields of processing, food, medicine, biology, chemical industry, electronics, energy, etc., the core is the separation membrane. [0003] Polyvinylidene fluoride is the preferred material for ultrafiltration membranes due to its excellent chemical stability, weather resistance, pollution resistance, radiation resistance and easy film formation. However, industrial wastewater generally contains a large amount of positively charged metal ions such as copper, chromium...

Claims

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Application Information

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IPC IPC(8): B01D71/34B01D67/00B01D61/14
CPCB01D61/145B01D67/0006B01D71/34
Inventor 李义涛杨策宇张凌飞张魁程堂剑
Owner RUYUAN DONGYANG LIGHT FLUORINE RESIN CO LTD
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