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A kind of preparation method of modified pvdf ultrafiltration membrane

An ultrafiltration membrane and modification technology, which is applied in the field of membrane materials, can solve the problems of reduced membrane water flux, poor membrane hydrophilicity, and low surface energy, and achieves reduced swelling rate, good hydrophilicity, and mild reaction conditions. Effect

Active Publication Date: 2020-05-15
浙江云度新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to its low surface energy, the prepared membrane has poor hydrophilicity and is easily polluted by impurities in the water during water treatment, which reduces the water flux of the membrane and cannot be recovered.

Method used

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  • A kind of preparation method of modified pvdf ultrafiltration membrane
  • A kind of preparation method of modified pvdf ultrafiltration membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A method for preparing a modified PVDF ultrafiltration membrane, comprising the following steps:

[0027] 1. Surface grafted polymer brush: PVDF ultrafiltration membrane is soaked in ethanol and ultrapure water three times, each time for half an hour, after taking it out, put it in a constant temperature water bath reactor, and add CuCl 2 , PMDETA, ultrapure water, polymerized monomer EGMA, crosslinking agent MBAA, the mass ratio of PEGMA to MBAA is 10:0.25, nitrogen deoxygenation, adding ascorbic acid solution after deoxygenation to initiate polymerization, continue nitrogen for half an hour, seal Continue the reaction. After the reaction reaches the set time, take out the PVDF membrane, soak it in ultrapure water and ethanol three times, and dry it at room temperature to obtain the polymer brushed PVDF ultrafiltration membrane;

[0028] 2. TiO loaded by magnetron sputtering 2 / WO 3 : The PVDF ultrafiltration membrane grafted with polymer brushes on the surface is pl...

Embodiment 2

[0031] A method for preparing a modified PVDF ultrafiltration membrane, comprising the following steps:

[0032] 1. Surface grafted polymer brush: PVDF ultrafiltration membrane is soaked in ethanol and ultrapure water three times, each time for half an hour, after taking it out, put it in a constant temperature water bath reactor, and add CuCl 2 , PMDETA, ultrapure water, polymerized monomer EGMA, crosslinking agent MBAA, the mass ratio of PEGMA to MBAA is 10:0.5, nitrogen deoxygenation, adding ascorbic acid solution after deoxygenation to initiate polymerization, continue nitrogen for half an hour, seal Continue the reaction. After the reaction reaches the set time, take out the PVDF membrane, soak it in ultrapure water and ethanol three times, and dry it at room temperature to obtain the polymer brushed PVDF ultrafiltration membrane;

[0033] 2. TiO loaded by magnetron sputtering 2 / WO 3 : The PVDF ultrafiltration membrane grafted with polymer brushes on the surface is pla...

Embodiment 3

[0036] A method for preparing a modified PVDF ultrafiltration membrane, comprising the following steps:

[0037] 1. Surface grafted polymer brush: PVDF ultrafiltration membrane is soaked in ethanol and ultrapure water three times, each time for half an hour, after taking it out, put it in a constant temperature water bath reactor, and add CuCl 2 , PMDETA, ultrapure water, polymerized monomer EGMA, cross-linking agent MBAA, the mass ratio of PEGMA to MBAA is 10:1, pass nitrogen to remove oxygen, add ascorbic acid solution after deoxygenation to initiate polymerization, continue to pass nitrogen for half an hour, seal Continue the reaction. After the reaction reaches the set time, take out the PVDF membrane, soak it in ultrapure water and ethanol three times, and dry it at room temperature to obtain the polymer brushed PVDF ultrafiltration membrane;

[0038] 2. TiO loaded by magnetron sputtering 2 / WO 3 : The PVDF ultrafiltration membrane grafted with polymer brushes on the su...

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Abstract

The invention discloses a preparation method of a modified PVDF (polyvinylidene fluoride) ultrafiltration membrane. The preparation method comprises following steps: 1, surface grafting with polymer brushes; 2, magnetron sputtering supporting of TiO2 / WO3; 3, DBS supramolecular self-assembly. According to the preparation method of the modified PVDF ultrafiltration membrane, body performance of a PVDF base membrane can be reserved completely, modification operation is simple, cost is low, and the obtained modified PVDF ultrafiltration membrane has excellent hydrophilcity and resistance to protein contamination, is good in bactericidal activity and high in mechanical strength and can complete filtration and catalytic degradation of dye molecules synchronously under natural light, thereby greatly improving treatment efficiency of dye wastewater.

Description

technical field [0001] The invention relates to the technical field of membrane materials, in particular to a preparation method of a modified PVDF ultrafiltration membrane. Background technique [0002] Industrial development is inseparable from the use of dyes, which are widely used in many fields such as textiles, papermaking, printing, food, pharmaceuticals, copying and printing. There are about 100,000 kinds of industrial dyes in the world, with an annual output of about 1 million tons. The industrial wastewater produced by dyes is one of the main pollutions of water bodies at present. About 60,000 tons of dyes are discharged into the environment with wastewater every year in the world. my country is a big country in the production and export of dyestuffs, ranking first in the world in both production volume and export volume. In the process of dye production and textile printing and dyeing, the discharge of industrial dyes changes the properties and components of nat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D61/14B01D67/00B01D69/02B01D71/78C02F1/30C02F1/44C02F101/30
CPCB01D61/145B01D67/0079B01D69/02B01D71/78B01D2325/10B01D2325/36C02F1/30C02F1/444C02F2101/308C02F2305/10
Inventor 杨晓飞
Owner 浙江云度新材料科技有限公司