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High strength nanometer modified ultrafilter membrane and preparation method thereof

A nano-modification and ultrafiltration membrane technology, applied in the field of ultrafiltration membranes, can solve problems such as low strength of ultrafiltration membranes, shortened membrane service life, and affecting membrane service life, and achieves simple membrane forming process, extended service life, and easy The effect of industrial production

Active Publication Date: 2013-12-25
浙江金成环保科技工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the strong hydrophobicity of the current polyvinylidene fluoride ultrafiltration membrane, which is easy to absorb hydrophobic substances in water during application, resulting in clogging of the membrane pores, causing membrane pollution, and shortening the service life of the membrane; The low porosity and low water flux of the membrane itself affect the service life of the membrane; the low strength of the ultrafiltration membrane is prone to damage and reduces the service life, and a high-strength nano-modified ultrafiltration membrane is provided.

Method used

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  • High strength nanometer modified ultrafilter membrane and preparation method thereof

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Embodiment 1

[0032] A high-strength nano-modified ultrafiltration membrane, the preparation steps of which are:

[0033] 1) Ultrasonic disperse carbon nanotubes with a diameter of 20nm in dimethylacetamide to form a uniform dispersion, then place polyvinylidene fluoride, polyvinyl alcohol and polyethylene glycol in the dispersion, and fully Dissolve and ultrasonically stir evenly;

[0034] The proportion of each component is: 40 parts of polyvinylidene fluoride, 8 parts of polyvinyl pyrrolidone, 5 parts of polyvinyl alcohol, 20 parts of polyethylene glycol and 0.05 part of carbon nanotube.

[0035] 2) Stir the mixed solution obtained in step 1) at 80°C for 3 hours, then let it stand at 45°C for 10 hours to obtain a casting solution;

[0036] 3) Scrape the film casting solution in step 2 on the plate, and then put the scraped film into an ethanol solution with a volume concentration of 30% to solidify to form a film;

[0037] 4) The film in step 3) is cross-linked with glutaraldehyde vapo...

Embodiment 2

[0041] A high-strength nano-modified ultrafiltration membrane, the preparation steps of which are:

[0042] 1) Ultrasonic disperse carbon nanotubes with a diameter of 50nm in dimethylacetamide to form a uniform dispersion, then place polyvinylidene fluoride, polyvinyl alcohol and polyethylene glycol in the dispersion, and fully Dissolve and ultrasonically stir evenly;

[0043] The ratio of each component is: 60 parts of polyvinylidene fluoride, 2 parts of polyvinylpyrrolidone, 10 parts of polyvinyl alcohol, 5 parts of polyethylene glycol, 0.5 parts of carbon nanotubes and 0.05 parts of nano titanium dioxide.

[0044] 2) Stir the mixed solution obtained in step 1) at 50°C for 5 hours, and then let it stand at 60°C for 5 hours to obtain a casting solution;

[0045]3) Scrape the film casting solution in step 2) on the plate, and then put the scraped film into an ethanol solution with a volume concentration of 40% to solidify to form a film;

[0046] 4) Cross-linking the film in...

Embodiment 3

[0050] A high-strength nano-modified ultrafiltration membrane, the preparation steps of which are:

[0051] 1) Ultrasonic disperse carbon nanotubes with a diameter of 100nm in dimethylacetamide to form a uniform dispersion, then place polyvinylidene fluoride, polyvinyl alcohol and polyethylene glycol in the dispersion, and fully Dissolve and ultrasonically stir evenly;

[0052] The ratio of each component is: 50 parts of polyvinylidene fluoride, 10 parts of polyethylene glycol and 2 parts of nano-titanium dioxide, the mass ratio of polyvinylpyrrolidone to polyvinylidene fluoride is 0.05 (2.5 parts), polyvinyl alcohol and polyvinylidene The mass ratio of vinylidene fluoride is 0.15 (7.5 parts), and the mass ratio of carbon nanotubes to polyvinylidene fluoride is 0.002 (0.1 part).

[0053] 2) Stir the mixed solution obtained in step 1) at 60°C for 8 hours, then let it stand at 40°C for 7 hours to obtain a casting solution;

[0054] 3) Scrape the casting solution in step 2 on t...

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Abstract

The invention belongs to the field of ultrafilter membrane technology, and specifically relates to a high strength nanometer modified ultrafilter membrane and a preparation method thereof. The high strength nanometer modified ultrafilter membrane comprises following ingredients, by weight, 40 to 60 portions of polyvinylidene fluoride, 2 to 8 portions of polyvinylpyrrolidone, 5 to 10 portions of polyvinyl alcohol, 5 to 20 portions of polyethylene glycol and 0.05 to 0.5 portion of carbon nanotube. The high strength nanometer modified ultrafilter membrane is prepared by flat plate casting or electrospinning. The high strength nanometer modified ultrafilter membrane is high in strength and excellent in hydrophilicity, and possesses relatively high poriness. Resistance of the high strength nanometer modified ultrafilter membrane is reduced, water flux is increased, and service life of the high strength nanometer modified ultrafilter membrane is prolonged.

Description

technical field [0001] The invention relates to the technical field of ultrafiltration membranes, in particular to a high-strength nano-modified ultrafiltration membrane and a preparation method thereof. Background technique [0002] PVDF is a membrane material with excellent performance, and has been widely used in drinking water purification, domestic sewage treatment, reclaimed water reuse, heavy metal wastewater, printing and dyeing wastewater, and oily wastewater. In terms of drinking water purification, PVDF hollow fiber ultrafiltration membrane can not only filter out harmful substances in water, but also retain trace elements necessary for human body, which has become a new development direction. In the aspect of desalination of seawater by double-membrane method, PVDF microfiltration membrane is selected as the pretreatment system of reverse osmosis, which greatly reduces the area occupied by the equipment and significantly improves the quality of produced water. T...

Claims

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Application Information

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IPC IPC(8): B01D71/34B01D67/00B01D61/14C02F1/44
Inventor 王北福聂立宏竺柏康张卫林智国
Owner 浙江金成环保科技工程有限公司
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