Surface modification method for polyvinylidene fluoride (PVDF) film or polyvinyl chloride (PVC) film

A polyvinylidene fluoride film and polyvinyl chloride film technology, which is applied in the field of surface modification of polyvinylidene fluoride film or polyvinyl chloride film, can solve the problem that the hydrophilic performance and anti-pollution performance cannot be greatly improved, and the experimental personnel Damage, complex experiments and other problems, to achieve the effects of good hydrophilicity and anti-pollution ability, less environmental pollution, and simple operation

Inactive Publication Date: 2012-07-11
NINGBO UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The existing Chinese journal Chemical Journal of Higher Schools (published February 2010, Volume 31, Issue 2, pp. 402-405) is published in the research on ATRP synthesis of graft copolymer PVDF-g-PNIPAAm and its separation membrane. Cuprous chloride (CuC1)/tris(N,N-dimethylaminoethyl)amine (Me 6 TREN) is a catalytic coordination system, using nitrogen nitrogen dimethylformamide (DMF) as a solvent, and directly grafting temperature-sensitive materials on commercial polyvinylidene fluoride (PVDF) powder by atom transfer radical polymerization (ATRP) N-isopropylacrylamide (NIPAAm), infrared spectroscopy (FTIR) and nuclear magnetic resonance (H NMR) analysis showed that PNIPAAm was successfully grafted onto PVDF, but the grafting rate was only about 4%, whic

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  • Surface modification method for polyvinylidene fluoride (PVDF) film or polyvinyl chloride (PVC) film

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Experimental program
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Effect test

Embodiment 1

[0030] Surface modification method of polyvinylidene fluoride membrane

[0031] (1) Vacuum low temperature plasma treatment

[0032] The polyvinylidene fluoride film is subjected to vacuum low-temperature plasma treatment, wherein the low-temperature plasma medium is argon gas, the treatment power is 15W, the treatment time is 20min, and the reaction vacuum degree is 100Pa;

[0033] (2) Atom Transfer Radical Polymerization

[0034]Add 50ml of methanol and deionized water in a volume ratio of 1:1 and a clean magnetic stirring rotor into a 500ml three-necked flask, place the three-necked flask on the stirrer, turn on the stirring switch of the stirrer, and put the Pass pure nitrogen into the three-necked flask, keep blowing nitrogen for 30min, then add 2mmol of 2,2'-bipyridine, 7.5mmol of sulfobetaine methyl methacrylate into the three-necked flask, stir until completely dissolved, then add 1mmol of CuCl powder , stirred until fully dissolved, the solution was reddish-brown, t...

Embodiment 2

[0036] Surface modification method of polyvinylidene fluoride membrane

[0037] (1) Vacuum low temperature plasma treatment

[0038] Soak the polyvinylidene fluoride film in a 2% NaCl solution by mass for 30 minutes, then dry it, and then treat it with argon low-temperature plasma. The vacuum degree of the plasma reaction chamber is controlled at 12Pa, and the radio frequency power source is preheated. After 5 minutes, treat for 10 minutes under the condition of radio frequency power of 50W. After the treatment, place it in a vacuum chamber for 2 hours, then wash the membrane with pure water to remove residual NaCl on the surface, and dry it for later use;

[0039] (2) Atom Transfer Radical Polymerization

[0040] Add 100ml of methanol and deionized water in a volume ratio of 2:1 and a clean magnetic stirring rotor into a 500ml three-necked flask, place the three-necked flask on the stirrer, turn on the stirring switch of the stirrer, and put the Pass pure nitrogen into the ...

Embodiment 3

[0042] Surface modification method of polyvinylidene fluoride membrane

[0043] (1) Vacuum low temperature plasma treatment

[0044] Soak the polyvinylidene fluoride film in a 0.5% NaOH solution by mass for 60 minutes, then dry it in the air, and then treat it with chlorine gas low-temperature plasma. The vacuum degree of the plasma reaction chamber is controlled at 9 Pa, and the radio frequency power source is preheated for 10 minutes. Finally, treat it under the condition of radio frequency power of 40W for 10min, place it in a vacuum chamber for 2 hours after the treatment, then wash the membrane with pure water to remove the residual NaOH on the surface, and dry it for later use;

[0045] (2) Atom Transfer Radical Polymerization

[0046] Put methanol and deionized water in a volume ratio of 3:2 and a clean magnetic stirring rotor into a three-necked flask, place the three-necked flask on the stirrer, turn on the stirring switch of the stirrer, and pour high-purity argon ...

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Abstract

The invention discloses a surface modification method for a polyvinylidene fluoride (PVDF) film or a polyvinyl chloride (PVC) film. The method is characterized by comprising the following steps of: (1) performing vacuum low temperature plasma treatment on the PVDF film or the PVC film at the power of 5 to 100W and the reaction vacuum degree of 2 to 100Pa for 1 to 20 minutes; and (2) mixing a solution which is formed by mixing methanol and deionized water and serves as a solvent, cuprous chloride or cuprous bromide serving as a catalyst, 2,2'-bipyridyl or a derivative thereof serving as a ligand, and sulphobetaine methyl methacrylate or allyl polyethylene glycol serving as a grafting monomer, controlling reaction temperature to 20-100 DEG C, and performing atom transfer radical polymerization (ATRP) reaction for 1 to 24 hours to obtain a product, wherein the molar ratio of the catalyst to the ligand is 1:(0.5-4), and the molar ratio of the film to the monomer is (100-0.1):1. The methodhas the advantages that: the hydrophilicity and anti-pollution capacity of the film can be improved, environment friendliness is achieved, and operation steps are simple.

Description

technical field [0001] The invention relates to a method for modifying the surface of a film, in particular to a method for modifying the surface of a polyvinylidene fluoride film or a polyvinyl chloride film. Background technique [0002] Polyvinylidene fluoride membrane (PVDF) and polyvinyl chloride membrane (PVC), as high-performance polymer membrane materials, are widely used in water treatment, protein separation, food processing and other related fields, but due to their strong hydrophobic effect , is susceptible to membrane fouling, so how to improve its hydrophilicity and increase its anti-fouling ability is the focus of current research. At present, the research on hydrophilic modification is mainly divided into two aspects: membrane surface modification and membrane material modification. The former is aimed at the modification of the finished membrane, while the latter is to modify the material first, and then use the phase transfer method to prepare a membrane w...

Claims

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Application Information

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IPC IPC(8): C08J7/18C08L27/16C08L27/06
Inventor 陆茵宋水均韩玉马均治
Owner NINGBO UNIV
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