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Preparation method of antibacterial and pollution-resisting PVDF (Polyvinylidene Fluoride) ultrafiltration membrane for water filtration

A pollution-resistant, water-filtering technology, applied in ultrafiltration, water/sewage treatment, chemical instruments and methods, etc., can solve problems such as ineffective killing of microorganisms, and achieve simple operation, good compatibility, and good antibacterial performance effect

Active Publication Date: 2018-02-09
南宁市生升膜分离技术应用研究所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The prior art physically or chemically modifies the surface hydrophilicity of PVDF membranes. However, simply modifying the hydrophilicity of PVDF membranes cannot effectively kill the attached and bred microorganisms.

Method used

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  • Preparation method of antibacterial and pollution-resisting PVDF (Polyvinylidene Fluoride) ultrafiltration membrane for water filtration

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] An antibacterial and pollution-resistant PVDF ultrafiltration membrane for water filtration mainly includes the following components in terms of parts by mass: the PVDF microporous membrane mainly includes: 100 parts of polyvinylidene fluoride, 15 parts of polyvinyl alcohol, 10 parts by mass Part silver-loaded chitosan; silver-loaded amount in the described silver-loaded chitosan is 250mg / g, and the degree of deacetylation of the described chitosan is 86%; joint agent.

[0024] A preparation method of an antibacterial and pollution-resistant PVDF ultrafiltration membrane for water filtration mainly comprises the following steps:

[0025] Step A: Dissolve PVDF and PEG in N-methylpyrrolidone and blend, stir at 45°C for 48 hours at a stirring speed of 200r / min; degas the prepared blend solution at a constant temperature and form a film on a glass plate ; Clean the solvent on the surface of the membrane with deionized water;

[0026] Step B: first dissolve chitosan in ace...

Embodiment 2

[0035]An antibacterial and pollution-resistant PVDF ultrafiltration membrane for water filtration mainly includes the following components in terms of parts by mass: the PVDF microporous membrane mainly includes: 100 parts of polyvinylidene fluoride, 20 parts of polyvinyl alcohol, 12 parts by mass Part silver-loaded chitosan; Silver loading in the described silver-loaded chitosan is 275mg / g, and the degree of deacetylation of the described chitosan is 86%; joint agent.

[0036] A preparation method of an antibacterial and pollution-resistant PVDF ultrafiltration membrane for water filtration mainly comprises the following steps:

[0037] Step A: Dissolve PVDF and PEG in N-methylpyrrolidone and blend, stir at 55°C for 48 hours at a stirring speed of 200r / min; degas the prepared blend solution at a constant temperature and form a film on a glass plate ; Clean the solvent on the surface of the membrane with deionized water;

[0038] Step B: first dissolve chitosan in acetic aci...

Embodiment 3

[0044] An antibacterial and pollution-resistant PVDF ultrafiltration membrane for water filtration mainly includes the following components in terms of parts by mass: the PVDF microporous membrane mainly includes: 100 parts of polyvinylidene fluoride, 13 parts of polyvinyl alcohol, 10 parts by mass Part silver-loaded chitosan; silver-loaded amount in the described silver-loaded chitosan is 235mg / g, and the degree of deacetylation of the described chitosan is 86%; joint agent.

[0045] A preparation method of an antibacterial and pollution-resistant PVDF ultrafiltration membrane for water filtration mainly comprises the following steps:

[0046] Step A: Dissolve PVDF and PEG in N-methylpyrrolidone and blend them, stir at 45°C for 48 hours at a stirring speed of 240r / min; degas the prepared blend solution at a constant temperature and form a film on a glass plate ; Clean the solvent on the surface of the membrane with deionized water;

[0047] Step B: first dissolve chitosan i...

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Abstract

The invention discloses a preparation method of an antibacterial and pollution-resisting PVDF (Polyvinylidene Fluoride) ultrafiltration membrane for water filtration. The preparation method mainly takes N-methyl pyrrolidone as a solvent and a polyethylene glycol solution is used for blending to modify a polyvinylidene fluoride material; then the mixture is used for coating to form a membrane, so as to obtain primarily-modified polyvinylidene fluoride membrane; then the polyvinylidene fluoride membrane is immersed for coating in a silver-loaded chitosan solution to obtain a modified PVDF micro-pore membrane. The preparation method disclosed by the invention is simple and the hydrophilic property and the antibacterial property of polyvinylidene fluoride are modified through an immersing andcoating method; the polyvinylidene fluoride micro-pore membrane prepared by the preparation method not only has a relatively good hydrophilic property, but also can be used for killing microorganism bacteria on the surface; the attachment amount of protein in sewage can be reduced; meanwhile, the protein can be inactivated and the service life of the polyvinylidene fluoride membrane is effectivelyprolonged.

Description

technical field [0001] The invention belongs to the technical field of polyvinylidene fluoride filter membranes for water filtration, and in particular relates to a preparation method of an antibacterial and pollution-resistant PVDF ultrafiltration membrane for water filtration. Background technique [0002] Polyvinylidene fluoride has the characteristics of excellent chemical stability, radiation resistance, heat resistance and easy film formation. However, the surface free energy of polyvinylidene fluoride is low, and the surface hydrophilicity of polyvinylidene fluoride film is poor. When polyvinylidene fluoride is used as a water treatment membrane, it is easy to be polluted, which leads to a decrease in the flux and separation effect of the PVDF water treatment membrane, which increases the difficulty of cleaning and reduces the service life of the membrane. [0003] The surface of the PVDF water treatment membrane is hydrophobic, and the colloids, proteins and other or...

Claims

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Application Information

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IPC IPC(8): B01D61/14B01D67/00B01D69/02B01D71/34C02F1/44
CPCB01D61/145B01D67/0002B01D67/0088B01D69/02B01D71/34B01D2325/48C02F1/444
Inventor 张欢
Owner 南宁市生升膜分离技术应用研究所