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Antibacterial and pollution-resistant composite reverse osmosis membrane and production method thereof

A reverse osmosis membrane, pollution-resistant technology, applied in reverse osmosis, semi-permeable membrane separation, chemical instruments and methods, etc., can solve the problems of reduced service life, increased operating costs, reduced separation performance, etc. The effect of easy operation and strong antibacterial and anti-pollution ability

Inactive Publication Date: 2018-12-18
VONTRON MEMBRANE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Microorganisms, bacteria, etc. are adsorbed on the surface of the reverse osmosis membrane, and the continuous reproduction causes the formation of a biological layer containing biological cells and organic polymer substances on the surface of the membrane, which eventually leads to a decrease in the separation performance of the membrane, a reduction in the service life, and an increase in operating costs.

Method used

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  • Antibacterial and pollution-resistant composite reverse osmosis membrane and production method thereof
  • Antibacterial and pollution-resistant composite reverse osmosis membrane and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Preparation of casting solution: mix polymer, silver nitrate, 3-aminopropyltrimethoxysilane (APS), methylcellulose, N,N-dimethylformamide (DMF), Stir at 135°C for 8 hours until the polymer dissolves, then stand in vacuum for 3 hours to obtain the casting solution; the casting solution contains 18.5% polymer, 0.15% silver nitrate, and 0.15% 3-aminopropyltrimethyl Oxysilane (APS), 4% methylcellulose, the solvent is N,N-dimethylformamide (DMF);

[0030] (2) Put the casting solution obtained in step (1) on the non-woven fabric to form a porous support layer through the liquid-solid phase inversion method. The phase inversion time is 0.75min, the water bath temperature is 17.5°C, and the heat curing water bath temperature is 70°C. The thickness of the film is 5.5mil, soaked in deionized water and stored, that is, the preparation of the porous support layer base film is completed;

[0031] (3) Soak the base film in an aqueous solution containing m-phenylenediamine, TAGH,...

Embodiment 2

[0038](1) Preparation of casting solution: mix polymer, silver nitrate, 3-aminopropyltrimethoxysilane (APS), methylcellulose, N,N-dimethylformamide (DMF), Stir at 120°C for 10 hours until the polymer is dissolved, then stand in vacuum for defoaming for 4 hours to obtain a casting solution; the casting solution contains 17% polymer, 0.1% silver nitrate, and 0.1% 3-aminopropyltrimethyl Oxysilane (APS), 2% methylcellulose, the solvent is N,N-dimethylformamide (DMF);

[0039] (2) The casting solution obtained in step (1) is formed on the non-woven fabric through the liquid-solid phase transformation method to form a porous support layer, the phase transformation time is 1min, the temperature of the water bath is 15°C, and the temperature of the thermal curing water bath is 60°C. The thickness is 4mil, soaked in deionized water and stored, that is, the preparation of the porous support layer base film is completed;

[0040] (3) Soak the base film in an aqueous phase solution conta...

Embodiment 3

[0047] (1) Preparation of casting solution: mix polymer, silver nitrate, 3-aminopropyltrimethoxysilane (APS), methylcellulose, N,N-dimethylformamide (DMF), Stir at 150°C for 6 hours until the polymer dissolves, then stand in vacuum for 2 hours to obtain the casting solution; the casting solution contains 20% polymer, 0.2% silver nitrate, and 0.2% 3-aminopropyltrimethyl Oxysilane (APS), 6% methylcellulose, the solvent is N,N-dimethylformamide (DMF);

[0048] (2) Put the casting solution obtained in step (1) on the non-woven fabric to form a porous support layer through the liquid-solid phase inversion method. The phase inversion time is 0.5min, the water bath temperature is 20°C, and the heat curing water bath temperature is 80°C. Control the membrane The thickness is 7mil, soaked in deionized water and stored, that is, the preparation of the porous support layer base film is completed;

[0049] (3) Soak the base film in an aqueous phase solution containing m-phenylenediamine,...

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Abstract

The invention relates to the technical field of reverse osmosis composite membranes, and concretely relates to an antibacterial and pollution-resistant composite reverse osmosis membrane and a production method thereof. Silver nitrate and a stabilizer 3-aminopropyltrimethoxysilane (APS) are introduced into a membrane casting solution, the silver nitrate and DMF undergo a redox reaction in the dissolving and stirring process of a high-molecular polymer in order to form nano-silver particles, the nano-silver particles form a nano-silver stable dispersion under the action of APS, and the nano-silver stable dispersion is firmly embedded in a porous support layer to make the membrane have a certain antibacterial property; and triaminoguanidine hydrochloride (TAGH) is introduced into an aqueousphase solution, and the TAGH, m-phenylenediamine and trimesoyl chloride (TMC) undergo an interfacial polymerization reaction to form a polyamide desalting layer, so the membrane surface of the polyamide desalting layer is smooth and highly hydrophilic. The anti-adhesion property and the organic pollution resistance of the reverse osmosis membrane are greatly improved. Additionally, the "structuralfragmentation" effect of an guanidino group is used to activate water molecules, so the water permeability is enhanced, and the water flux is improved without sacrificing the salt rejection rate.

Description

technical field [0001] The invention relates to the technical field of reverse osmosis composite membranes, in particular to an antibacterial and pollution-resistant composite reverse osmosis membrane and a preparation method thereof. Background technique [0002] Reverse osmosis membrane separation technology is widely used in wastewater treatment, seawater desalination, drinking water purification and other fields due to its advantages such as simple operation, no need for chemical additives, low energy consumption, and easy scale-up. However, the reverse osmosis membrane's low fouling resistance greatly limits its development in industrial applications. [0003] Membrane fouling mainly includes inorganic fouling, organic fouling, colloidal fouling, biological fouling, etc. Various bacteria and microorganisms inevitably exist in water bodies. Microorganisms, bacteria, etc. are adsorbed on the surface of the reverse osmosis membrane, and the continuous reproduction causes...

Claims

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Application Information

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IPC IPC(8): B01D71/68B01D71/56B01D69/12B01D69/02B01D67/00B01D61/02
CPCB01D61/025B01D67/0009B01D69/02B01D69/12B01D71/56B01D71/68B01D2325/48
Inventor 刘仕忠梁松苗许国杨金焱吴宗策
Owner VONTRON MEMBRANE TECH CO LTD
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