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Antibacterial reverse osmosis composite membrane as well as preparation method and application thereof

A reverse osmosis composite membrane, antibacterial coating technology, applied in reverse osmosis, semi-permeable membrane separation, chemical instruments and methods, etc., can solve the complex preparation method of nanoparticles, biological pollution of reverse osmosis composite membrane, salt rejection and water In order to avoid the decline of antibacterial performance, facilitate large-scale production and easy dispersion

Inactive Publication Date: 2017-09-29
宁波日新恒力科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] During the long-term use of the reverse osmosis composite membrane, microorganisms such as bacteria and fungi in the raw material solution will slowly adsorb and deposit on the surface of the membrane, multiplying in large quantities with the organic matter in the raw material solution as nutrients, and eventually cause serious damage to the reverse osmosis composite membrane. Biofouling, which significantly reduces the salt rejection rate and water flux, and shortens the service life of the membrane
Membrane biofouling cannot be completely eliminated by a single pretreatment, and pretreatment is expensive and ineffective
In order to solve this problem, the Chinese patent application No. 201210064238.1 introduces nano-bactericidal particles into the surface of the polyamide layer to prepare an antibacterial reverse osmosis composite membrane resistant to inorganic pollution, although the nano-bactericidal particles introduced on the surface of the polyamide layer can achieve reverse osmosis The antibacterial effect of the composite membrane, but the preparation method of nanoparticles is complicated, the cost is high, and due to the difficulty in the dispersion of nanoparticles, the distribution of nanoparticles in the prepared reverse osmosis composite membrane is uneven, resulting in unstable antibacterial performance

Method used

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  • Antibacterial reverse osmosis composite membrane as well as preparation method and application thereof
  • Antibacterial reverse osmosis composite membrane as well as preparation method and application thereof
  • Antibacterial reverse osmosis composite membrane as well as preparation method and application thereof

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preparation example Construction

[0024] The preparation method of the reverse osmosis membrane: step a, add m-phenylenediamine, triethylamine and camphorsulfonic acid into water in proportion, stir magnetically for 10 minutes until dissolved, and obtain m-phenylenediamine aqueous solution, wherein the mass of m-phenylenediamine Concentration is 6%, the mass concentration of triethylamine is 3%, and the mass concentration of camphorsulfonic acid is 6%;

[0025] Step b, adding trimesoyl chloride into n-hexane in proportion, stirring until dissolved to obtain a n-hexane solution of trimesoyl chloride, wherein the mass concentration of trimesoyl chloride is 0.3%;

[0026] Step c, immerse the polysulfone support membrane in the m-phenylenediamine aqueous solution prepared in step a, the immersion time is 25s, remove the solvent after taking it out, and then immerse it in the n-hexane solution of trimesoyl chloride prepared in step 2 to carry out interfacial polymerization reaction, the interfacial polymerization r...

Embodiment 1

[0029] Step 1. Dissolve PVA with a degree of polymerization of 1000 and a degree of alcoholysis of 99% in an aqueous solution at 80°C and stir evenly to obtain a PVA aqueous solution with a mass concentration of 5%; then add purified and activated PVA to the aqueous solution of PVA Diatomite with a particle size of 2 μm was magnetically stirred and ultrasonically dispersed for 15 minutes to obtain a diatomite PVA aqueous solution with a mass concentration of 0.01%;

[0030] Step 2. In the diatomite-containing PVA aqueous solution prepared in step 1, add glutaraldehyde and hydrochloric acid until the mass concentration of the glutaraldehyde is 0.6% and the mass concentration of the hydrochloric acid is 0.2%, then magnetically stir And ultrasonically dispersed for 20 minutes to obtain a coating solution containing diatomaceous earth;

[0031] Step 3: Coating the diatomite-containing coating solution prepared in Step 2 on the surface of the reverse osmosis membrane, and putting i...

Embodiment 2

[0033] Step 1. Dissolve PVA with a degree of polymerization of 1000 and a degree of alcoholysis of 99% in an aqueous solution at 80°C and stir evenly to obtain a PVA aqueous solution with a mass concentration of 5%; then add purified and activated PVA to the aqueous solution of PVA Diatomite with a particle size of 4 μm was magnetically stirred and ultrasonically dispersed for 15 minutes to obtain a diatomite PVA aqueous solution with a mass concentration of 0.01%;

[0034] Step 2. In the diatomite-containing PVA aqueous solution prepared in step 1, add glutaraldehyde and hydrochloric acid until the mass concentration of the glutaraldehyde is 0.6% and the mass concentration of the hydrochloric acid is 0.2%, then magnetically stir And ultrasonically dispersed for 20 minutes to obtain a coating solution containing diatomaceous earth;

[0035] Step 3: Coating the diatomite-containing coating solution prepared in Step 2 on the surface of the reverse osmosis membrane, and putting i...

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Abstract

The invention relates to an antibacterial reverse osmosis composite membrane as well as a preparation method and application thereof. The preparation method of the antibacterial reverse osmosis composite membrane comprises the following steps: 1, purifying and activating kieselguhr to obtain the kieselguhr; 2, dissolving polyvinyl alcohol (PVA) into a water solution at the temperature of 50-90 DEG C, and evenly stirring to obtain a PVA water solution; then, adding the kieselguhr into the PVA water solution, carrying out magnetic stirring, and carrying out ultrasonic dispersion for 10-30min to obtain kieselguhr-containing PVA water solution; 3, adding a cross-linking agent and an acid catalyst into the kieselguhr-containing PVA water solution, carrying out magnetic stirring, and carrying out ultrasonic dispersion for 10-30min to obtain a kieselguhr-containing coating solution; 4, coating the surface of a reverse osmosis membrane with the kieselguhr-containing coating solution, putting the reverse osmosis membrane into a drying oven at the temperature of 60-120 DEG C, and carrying out a cross-linking reaction for 5-20min to obtain the antibacterial reverse osmosis composite membrane. The antibacterial reverse osmosis composite membrane prepared by the method is stable in antibacterial properties and low in manufacturing cost.

Description

technical field [0001] The invention belongs to the field of preparation of reverse osmosis composite membranes, in particular to an antibacterial reverse osmosis composite membrane and its preparation method and application. Background technique [0002] During the long-term use of the reverse osmosis composite membrane, microorganisms such as bacteria and fungi in the raw material solution will slowly adsorb and deposit on the surface of the membrane, multiplying in large quantities with the organic matter in the raw material solution as nutrients, and eventually cause serious damage to the reverse osmosis composite membrane. Biological fouling will significantly reduce the desalination rate and water flux, and shorten the service life of the membrane. Membrane biofouling cannot be completely eliminated by a single pretreatment, and pretreatment is expensive and ineffective. In order to solve this problem, the Chinese patent application No. 201210064238.1 introduces nano-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/56B01D69/12B01D61/02C02F1/44
CPCB01D71/56B01D61/025B01D69/125B01D2323/30B01D2325/48C02F1/441
Inventor 不公告发明人
Owner 宁波日新恒力科技有限公司
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