High-flux stable anti-pollution polyvinylidene fluoride ultrafiltration membrane and preparation method thereof

A polyvinylidene fluoride, anti-pollution technology, used in ultrafiltration, chemical instruments and methods, membrane technology and other directions, can solve the problems of stable existence, separation and separation, and reduced hydrophilicity of membrane materials, and achieves simple and reliable methods. low cost effect

Pending Publication Date: 2018-09-28
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, many studies have found that traditional hydrophilic copolymers cannot exist stably in the membrane body, and are easily decomposed and separated by the influence of the hydraulic environment and chemical reagents, resulting in a decrease in the hydrophilicity of the membrane material during long-term use, which affects ultrafiltration. Potential threats to the stability of membrane anti-fouling performance

Method used

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  • High-flux stable anti-pollution polyvinylidene fluoride ultrafiltration membrane and preparation method thereof
  • High-flux stable anti-pollution polyvinylidene fluoride ultrafiltration membrane and preparation method thereof
  • High-flux stable anti-pollution polyvinylidene fluoride ultrafiltration membrane and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0026] A method for preparing a high-throughput stable anti-fouling polyvinylidene fluoride ultrafiltration membrane, comprising the following steps:

[0027] (1) Add the organic solvent into the container, start stirring, and then add the polymer and the amphiphilic block copolymer into the container to prevent agglomeration, and seal the container to isolate the air, heat to 55 ° C, at a speed of Stir at 450rpm to completely dissolve the polymer and the amphiphilic block copolymer, and stand at 40°C for defoaming to obtain a casting solution; the mass ratio of the polymer, organic solvent, and amphiphilic block copolymer is 25:68.8 :6.2;

[0028] (2) dissolving the inorganic salt in deionized water at 25°C so that the concentration of the inorganic salt is 400g / L to prepare a coagulation bath;

[0029] (3) Pour the casting solution onto the glass lens, scrape it with a scraper with a gap height of 200 μm, immerse the glass lens with the casting solution in a coagulation bat...

Embodiment 2

[0032] A method for preparing a high-throughput stable anti-fouling polyvinylidene fluoride ultrafiltration membrane, comprising the following steps:

[0033] (1) Add the organic solvent into the container, start stirring, and then add the polymer and the amphiphilic block copolymer into the container to prevent agglomeration, and seal the container to isolate the air, heat to 75 ° C, at a speed of Stir at 500rpm to completely dissolve the polymer and the amphiphilic block copolymer, and stand at 45°C for defoaming to obtain a casting solution; the mass ratio of the polymer, organic solvent, and amphiphilic block copolymer is 12:81 :7;

[0034] (2) dissolving the inorganic salt in deionized water at 35°C so that the concentration of the inorganic salt is 100g / L to prepare a coagulation bath;

[0035] (3) Pour the casting solution onto the glass lens, scrape it with a scraper with a gap height of 100 μm, immerse the glass lens with the casting solution in a coagulation bath fo...

Embodiment 3

[0038] A method for preparing a high-throughput stable anti-fouling polyvinylidene fluoride ultrafiltration membrane, comprising the following steps:

[0039] (1) Add the organic solvent into the container, start stirring, then add the polymer and the amphiphilic block copolymer into the container to prevent agglomeration, seal the container to isolate the air, heat to 80°C, and Stir under the condition of 650rpm to completely dissolve the polymer and the amphiphilic block copolymer, and stand at 35°C for defoaming to obtain a casting solution; the mass ratio of the polymer, organic solvent, and amphiphilic block copolymer is 20:75.5 :4.5;

[0040] (2) dissolving two kinds of inorganic salts in deionized water at 30° C. so that the concentration of the inorganic salts is 520 g / L to prepare a coagulation bath;

[0041] (3) Pour the casting solution onto the glass lens, scrape it with a scraper with a gap height of 250 μm, immerse the glass lens with the casting solution in a c...

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Abstract

The invention discloses a high-flux stable anti-pollution polyvinylidene fluoride ultrafiltration membrane and a preparation method thereof. The preparation method includes the steps: adding organic solvents into a container, starting stirring, adding polymers and amphiphilic block copolymers into the container, preventing clumping, sealing the container to isolate air, continuing heating and stirring until the polymers and the copolymers are completely dissolved, and finally, performing standing and defoaming to obtain casting solution; dissolving inorganic salt in the deionized water to obtain a coagulating bath; pouring the casting solution onto a glass lens, slicking the casting solution by a scraper, soaking the glass lens with the casting solution in the coagulating bath and taking out the glass lens after gelation to obtain the high-flux stable anti-pollution polyvinylidene fluoride ultrafiltration membrane. Experiments prove that the flux and the anti-pollution stability of theultrafiltration membrane are remarkably improved, and the method is simple, reliable, low in cost and applicable to large-scale industrial production and preparation.

Description

technical field [0001] The invention relates to a high-performance ultrafiltration membrane material and a preparation method thereof, in particular to a preparation method of a high-flux stable anti-pollution polyvinylidene fluoride ultrafiltration membrane. Background technique [0002] In recent years, the shortage of water resources and water pollution have exacerbated the contradiction between water supply and demand. The new "Drinking Water Sanitation Standard" (GB5749-2006) has strengthened the limits on the content of organic matter, microorganisms and disinfection by-products in water, making traditional water treatment The process is difficult to meet the new water quality standard requirements. As an advanced water treatment technology, membrane separation technology has the advantages of high separation efficiency, small footprint, simple operation, no phase change and no secondary pollution, and has gradually become a feasible technology to ensure drinking water...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): B01D71/34B01D67/00B01D61/14C02F1/44
CPCB01D61/145B01D67/0013B01D71/34C02F1/444
Inventor张阳叶霖张宏伟
OwnerTIANJIN POLYTECHNIC UNIV