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Nano silver-polyvinylidene fluoride composite separation membrane and preparation method thereof

A technology of polyvinylidene fluoride and nano-silver, which is applied in the fields of semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve the problem that it is not easy to popularize polyvinylidene fluoride membrane with micro-powder hybridization of inorganic substances, the effect is not ideal, and the preparation Long time and other problems, to achieve the effect of low requirements for film-making equipment and process conditions, ideal dispersion effect, and short film-making time

Inactive Publication Date: 2012-01-04
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The patent CN1724586A relates to a nano-alumina modified polyvinylidene fluoride separation membrane and its preparation method. The modified polyvinylidene fluoride membrane increases the hydrophilicity and resistance of the membrane while retaining the original excellent performance. Pollution, and its water flux is also improved; but the rejection rate of this method is low, and the preparation time of the membrane is too long
[0005] In the patent CN100537644C, it relates to a preparation method of inorganic micropowder hybridized polyvinylidene fluoride. The method is simple and requires low equipment requirements, and the water flux and retention rate of the obtained membrane product are greatly improved; but this method The effect of the type and morphology of nanoparticles on the membrane performance is ignored, and because the dispersion operation of nanoparticles is limited to stirring, the effect is not ideal; the prepared membrane is also limited to a flat membrane, which is not easy to be mixed with inorganic powder. Further promotion of polyvinylidene fluoride film

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Add 0.5g of nano-silver powder (particle size 20-60nm) into 40g of N,N-dimethylacetamide and ultrasonically disperse for 0.5 h, then add 2g of polyvinylpyrrolidone and 7.5g of polyvinylidene fluoride in sequence, and stir at 80°C for 14h , until the polyvinylidene fluoride is completely dissolved, after 2.5 hours of ultrasonic dispersion, it is degassed at a constant temperature of 40°C for 6 hours to obtain a casting solution; the defoamed casting solution is quickly poured on a glass plate to cast a film; after casting The casting solution was pre-evaporated at 20°C for 8 hours and then put into 10°C deionized water to solidify into a film, and the water flux of the obtained film was lower than 20L / m 2 h, the rejection rate BSA is lower than 50%.

[0036] The resulting membrane was hydrophilized with a 3wt% Tween 80 aqueous solution at 20°C for 60 minutes, and dried to obtain a modified nano-silver-polyvinylidene fluoride composite separation membrane with a water flu...

Embodiment 2

[0038] Silver cations are reduced to silver atoms to form nano-silver sol, and nano-silver powder is obtained through suction filtration, passivation, washing, drying and other operations; 0.5g of nano-silver powder prepared is added to 37g N,N-dimethyl Add 3.5g of polyvinylpyrrolidone and 9g of polyvinylidene fluoride in turn for 2 hours, and stir at 100°C for 10 hours until the polyvinylidene fluoride is completely dissolved. After 2.5 hours of ultrasonic dispersion, stand at a constant temperature at 50°C for defoaming 6h, to obtain the casting solution; quickly pour the defoamed casting solution on the glass plate to cast the film; the casting solution after the casting is pre-evaporated at room temperature for 5 hours, and then put into 20°C deionized water to solidify and form a film. The resulting membrane water flux is lower than 20L / m 2 h, the rejection rate BSA is lower than 55%.

[0039] The obtained membrane was hydrophilized with 10wt% Tween 80 aqueous solution a...

Embodiment 3

[0041] Silver cations are reduced to silver atoms to form nano-silver sol, and nano-silver powder is obtained through suction filtration, passivation, washing, drying and other operations; 0.5g of nano-silver powder prepared is added to 35g N,N-dimethyl Add 3.5g of polyvinylpyrrolidone and 11g of polyvinylidene fluoride in turn for 2 hours, and stir at 100°C for 10 hours until the polyvinylidene fluoride is completely dissolved. After 2.5 hours of ultrasonic dispersion, stand at constant temperature at 50°C for defoaming 6h, to obtain the casting solution; quickly pour the defoamed casting solution on the glass plate to cast the film; the casting solution after the casting is pre-evaporated at room temperature for 5 hours, and then put into 20°C deionized water to solidify and form a film. The resulting membrane water flux is lower than 13L / m 2 h, the rejection rate BSA is lower than 50%.

[0042] The resulting membrane was hydrophilized with 8wt% Tween 80 aqueous solution at...

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Abstract

The invention discloses a nano silver-polyvinylidene fluoride composite separation membrane and a preparation method thereof. The separation membrane is obtained by modifying a polyvinylidene fluoride membrane with nano silver. According to the invention, two dispersion methods namely a physical method and a chemical method are simultaneously adopted in the preparation process, so that nano particle reaches an ideal dispersion effect in the polyvinylidene fluoride separation membrane and a reliable guarantee is provided for the excellent property of the membrane. In the invention, a noble metal nano silver the price of which is relatively low is added, and the amount of nano silver is regulated, so that the mechanical property, antibiotic property and pollution resistance of the polyvinylidene fluoride separation membrane are greatly improved, the water flux and trapping rate of the polyvinylidene fluoride separation membrane are also improved, the service life of the membrane is prolonged, and the membrane has high performance-to-price ratio.

Description

technical field [0001] The invention relates to a polyvinylidene fluoride composite separation membrane and a preparation method thereof, in particular to a polyvinylidene fluoride composite separation membrane modified by nano-silver and a preparation method thereof, and belongs to the technical field of membrane materials and membrane preparation. Background technique [0002] With the research and development of nanotechnology, nano-inorganic-organic composite membranes have gradually become a hot spot in membrane research. Due to their respective advantages of organic and inorganic membranes, and special properties that single membrane materials do not have, nano-inorganic -Organic composite membranes can be applied in many fields, such as separation of gases, nanofiltration and ultrafiltration, fuel cells, proton conduction membranes, enzyme reactors and coatings, etc. [0003] Because nano-silver has good physical properties, chemical properties, and nano-material-spec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D69/12B01D67/00
Inventor 李平赵乾
Owner UNIV OF JINAN
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