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Preparation method for hydrophilic polyvinylidene fluoride (PVDF) antibacterial ultrafiltration membrane

A polyvinylidene fluoride and ultrafiltration membrane technology, which is applied in chemical instruments and methods, membranes, membrane technology, etc., can solve the problems of large amount of silver salt, increased modification cost, and difficulty in controlling the uniformity of the membrane to achieve antibacterial significant effect

Inactive Publication Date: 2016-08-10
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Chinese patent (publication number: 102989329A) discloses a kind of Ag / TiO 2 Modified PVDF ultrafiltration membrane and its preparation method and application, preparing PVDF ultrafiltration membrane with good hydrophilicity, good photocatalytic activity and antibacterial property by blending and modifying active components, but this method is costly and the uniformity of the membrane is not easy control
[0004] Chinese patent (publication number: 103127839A) discloses a method for improving the anti-pollution ability of PVDF membranes. By adding nano-components, the phase inversion method is used to prepare PVDF membranes with strong anti-pollution ability, but the direct addition of nano-oxides increases the modification. cost, not conducive to industrial production
However, the amount of silver salt used in this method is large, and silver oxide may be formed during the formation of nano-silver, which will affect the improvement of film performance.

Method used

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  • Preparation method for hydrophilic polyvinylidene fluoride (PVDF) antibacterial ultrafiltration membrane
  • Preparation method for hydrophilic polyvinylidene fluoride (PVDF) antibacterial ultrafiltration membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Prepare a uniform dispersion: weigh 0.10g GO and disperse it in 80.9g DMF, add 1.5g PVP after ultrasonic dispersion for 2h, continue ultrasonication for 0.5h, then add 0.5g AgNO 3 Ultrasound 0.5h to form a uniform dispersion.

[0024] (2) Preparation of pre-reaction solution at room temperature: Add 1.0g of F127 to the above-mentioned uniform dispersion at the same time with magnetic stirring, and then add 16g of PVDF after stirring evenly, and stir for 6 hours at room temperature to form a uniform and transparent pre-reaction solution.

[0025] (3) Preparation of casting solution by in-situ thermal reduction: the pre-reaction solution was vacuum-degassed for 20 minutes and sealed, then reacted in an oil bath at 60°C for 80 hours to prepare a casting solution.

[0026] (4) Preparation of antibacterial film by immersion precipitation phase inversion method: scrape the above-mentioned casting solution on a clean glass plate, let it stand in the air for 10 seconds, the...

Embodiment 2

[0028] (1) Prepare a uniform dispersion: weigh 0.15g GO and disperse it in 78.4g DMF, add 1.5g PVP after ultrasonic dispersion for 2 hours, continue ultrasonication for 1 hour, then add 0.45g AgNO 3 Ultrasound 0.5h to form a uniform dispersion.

[0029] (2) Preparation of pre-reaction solution at room temperature: Add 1.5g of F127 to the above-mentioned uniform dispersion at the same time with magnetic stirring, and then add 18g of PVDF after stirring evenly, and stir for 8 hours at room temperature to form a uniform and transparent pre-reaction solution.

[0030] (3) Preparation of casting solution by in-situ thermal reduction: after vacuum degassing for 5 minutes and sealing, the pre-reaction solution was reacted in an oil bath at 40°C for 10 hours to prepare casting solution.

[0031] (4) Preparation of antibacterial film by immersion precipitation phase inversion method: scrape the above-mentioned casting solution on a clean glass plate, let it stand in the air for 10 seco...

Embodiment 3

[0033] (1) Prepare a uniform dispersion: weigh 0.65g GO and disperse it in 76.6g DMF, add 1.8g PVP after ultrasonic dispersion for 2h, continue ultrasonication for 0.5h, then add 1.25g AgNO 3 Ultrasound 0.5h to form a uniform dispersion.

[0034] (2) Preparation of pre-reaction solution at room temperature: Add 1.8g of F127 to the above uniform dispersion at the same time with magnetic stirring, and then add 18g of PVDF after stirring evenly, and stir for 6 hours at room temperature to form a uniform and transparent reaction solution.

[0035] (3) Preparation of casting solution by in-situ thermal reduction: the pre-reaction solution was vacuum-degassed for 10 minutes and sealed, then reacted in an oil bath at 50° C. for 10 hours to prepare a casting solution.

[0036] (4) Preparation of antibacterial film by immersion precipitation phase inversion method: scrape the above-mentioned casting solution on a clean glass plate, let it stand in the air for 10 seconds, then immerse i...

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Abstract

The invention discloses a preparation method for a hydrophilic polyvinylidene fluoride (PVDF) antibacterial ultrafiltration membrane. The preparation method comprises the following steps: (1) ultrasonically mixing PVP, AgNO3 and F127 in a DMF dispersion liquid of graphene oxide, thereby acquiring a uniformly dispersed mixing casting film liquid system; (2) adding PVDF powder into the mixing casting film liquid system, magnetically stirring for 6-10h and acquiring a pre-reaction solution, wherein PVDF accounts for 15-19% of the total mass of the system; (3) carrying out vacuum degassing and sealing on the pre-reaction solution acquired in the step (2) and then putting into an oil bath at 50-80 DEG C, stirring for 6-12h, standing and de-foaming for 8-12h, thereby acquiring the casting film liquid containing antibacterial active ingredients; and (4) preparing a modified antibacterial ultrafiltration membrane according to an immersion precipitated phase inversion method. The preparation method disclosed by the invention is simple. The acquired PVDF membrane has the advantages of excellent hydrophilicity, high flux, strong anti-pollution capacity and higher antibacterial activity.

Description

technical field [0001] The invention belongs to the technical field of material modification and preparation, and in particular relates to a preparation method of a hydrophilic polyvinylidene fluoride antibacterial ultrafiltration membrane. Background technique [0002] Vinylidene fluoride is a semi-crystalline polymer with good chemical stability, heat resistance, mechanical stability, and can be dissolved in some strong polar organic solvents at low temperatures, easy to use phase Membranes produced by the conversion method can prepare asymmetric ultrafiltration membranes and microfiltration membranes (flat membranes and hollow fiber membranes), and can be further chemically modified to obtain other functions and prepare functional separation membranes. It is widely used in water treatment, biomedicine, food processing and other fields. However, as a new type of polymer membrane material with excellent performance, PVDF also has disadvantages, that is, the extremely stron...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D67/00B01D69/02
CPCB01D71/34B01D67/0079B01D69/02B01D2325/36B01D2325/48
Inventor 陈桂娥吴琼许振良狄照文桂明哲徐孙杰朱维纬孙威广郑晓鹏高峰
Owner SHANGHAI INST OF TECH
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