Highly-hydrophilic grafted modified polyvinylidene fluoride (PVDF) film and preparation method thereof

A graft modification, hydrophilic technology, applied in the field of membrane materials, can solve the problems of reduced service life, low membrane surface energy, limited application, etc., to achieve good pollution resistance, strong hydrophilicity, and controllable molecular weight. Effect

Inactive Publication Date: 2019-10-18
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The surface energy of PVDF membrane is very low, resulting in strong hydrophobicity of the membrane, which makes the membrane susceptible to contamination by protein aqueous solution, resulting in decreased flux and reduced service life of the membrane, which limits its application in the field of water treatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0030] (1) Preparation of UV-induced Cu(II) catalyzed reversible passivation free radical polymerization graft copolymer: In a quartz reactor, weigh 1 part of CuCl 2 powder and 50 parts of PVDF powder with a molecular weight of 180000Da, and 500 parts of 1-methyl-2-pyrrolidone (NMP). Stir at room temperature, blow in argon; weigh 150 parts of N-methylolacrylamide (NMA) at the same time, dissolve in 150 parts of NMP at room temperature, and prepare NMA solution. After aeration for 1 h, add 2.5 parts of Me 6 -Tren and prepared NMA solution. Place the sealed quartz reactor under the ultraviolet radiation reactor, set the ultraviolet wavelength to 100nm, stir and react for 4 hours, pour the reaction solution into the ethanol solution, wash and stir for 10 minutes. After repeating 3 times, filter with suction, and store the product in a vacuum oven at 50°C for drying.

[0031] (2) Preparation of casting solution: In a three-necked flask, weigh the graft copolymer PVDF-g-NMA with...

experiment example 2

[0035] (1) Preparation of UV-induced Cu(II) catalyzed reversible passivation free radical polymerization graft copolymer: In a quartz reactor, weigh 1 part of CuCl 2 powder and 60 parts of PVDF powder with a molecular weight of 275000Da, 600 parts of 1-methyl-2-pyrrolidone (NMP). Stir at room temperature, blow in argon; weigh 200 parts of N-methylolacrylamide (NMA) at the same time, dissolve in 200 parts of NMP at room temperature, and prepare NMA solution. After aeration for 1 h, under the condition of aeration and stirring, add 5 parts of Me 6 -Tren and prepared NMA solution. Place the sealed quartz reactor under the ultraviolet radiation reactor, set the ultraviolet wavelength to 200nm, stir and react for 5 hours, pour the reaction solution into the ethanol solution, wash and stir for 20 minutes. After repeating 3 times, suction filtration was performed, and the product was stored in a vacuum oven at 60°C for drying.

[0036] (2) Preparation of casting solution: In a thr...

experiment example 3

[0040] (1) Preparation of UV-induced Cu(II) catalyzed reversible passivation free radical polymerization graft copolymer: In a quartz reactor, weigh 1 part of CuCl 2 powder and 70 parts of PVDF powder with a molecular weight of 530000Da, and 700 parts of 1-methyl-2-pyrrolidone (NMP). Stir at room temperature, blow in nitrogen; weigh 250 parts of N-methylolacrylamide (NMA) at the same time, dissolve in 250 parts of NMP at room temperature, and prepare NMA solution. After ventilating for 1 h, under the condition of stirring while ventilating, add 7.5 parts of Me 6 -Tren and prepared NMA solution. Place the sealed quartz reactor under the ultraviolet radiation reactor, set the ultraviolet wavelength to 300nm, stir and react for 6 hours, pour the reaction solution into the ethanol solution, wash and stir for 30 minutes. After repeating 3 times, filter with suction, and store the product in a vacuum oven at 70°C for drying.

[0041] (2) Preparation of casting solution: In a thre...

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PUM

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Abstract

The invention relates to a highly-hydrophilic grafted modified polyvinylidene fluoride (PVDF) film and a preparation method thereof. The highly-hydrophilic grafted modified PVDF film is characterizedin that a copolymer film is prepared by a grafted copolymer synthesized by the PVDF with the molecular weight being 180000-600000 Da and acrylamide monomers. The preparation method specifically includes the steps that 1, a Cu (II) catalyzed reversible passivation free radicals polymerization grafted copolymer is prepared by induction of ultraviolet light; 2, a casting solution is prepared; and 3,the modified PVDF membrane is prepared by NIPS (nonsolvent-induced phase separation). The prepared modified PVDF hydrophilic film has the advantages of the large pure water flux, the high retention rate, the high hydrophilic performance, good pollution resistance and the long service life.

Description

technical field [0001] The invention belongs to the field of membrane materials, and relates to the preparation of various copolymers and their application to the preparation of highly hydrophilic modified PVDF membranes; in particular, to a highly hydrophilic graft modified PVDF membrane and a preparation method thereof. Background technique [0002] Membrane separation technology is a high-efficiency separation process with multiple functions such as concentration, purification, and refining. It requires low energy consumption for separation, no local overheating, high separation efficiency, small footprint, and is environmentally friendly. Therefore, at present, various membrane separation technologies have been developed with multiple effects, playing an important role in urban wastewater treatment, food, petrochemical, pharmaceutical and other industrial fields, and bringing significant social, environmental and economic benefits to human beings, society and the country....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/78B01D71/34B01D69/02B01D67/00
CPCB01D67/0006B01D69/02B01D71/34B01D71/78B01D2325/24B01D2325/30B01D2325/36
Inventor 李卫星黄路宽邢卫红
Owner NANJING UNIV OF TECH
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