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Microbial contamination resistance composite reverse osmosis membrane and preparation method thereof

A reverse osmosis membrane, microorganism-resistant technology, applied in semi-permeable membrane separation, chemical instruments and methods, osmosis/dialysis water/sewage treatment, etc. Layer integrity and uniformity, affecting the application and promotion of reverse osmosis membranes, to achieve the effect of increasing the ability to resist microbial pollution and hydrophilicity, improving the performance of resistance to microbial pollution, and being easy to prepare and operate

Active Publication Date: 2010-11-03
VONTRON TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the existing composite reverse osmosis membranes have high salt retention rate and water permeation performance, membrane fouling is still one of the key problems that plague the application of composite reverse osmosis membranes.
After years of research by scientific researchers, although the anti-inorganic and anti-organic pollution performance of composite reverse osmosis membranes has been greatly improved, the research on anti-microbial pollution of reverse osmosis membranes is still in its infancy.
Microbial fouling is still the most common and serious problem in the application of reverse osmosis membranes, which seriously affects the application and promotion of reverse osmosis membranes
There are patent literature reports (such as US6551,536B1) using titanium dioxide to modify the surface of the reverse osmosis membrane to have better performance against microbial contamination, but the addition of titanium dioxide destroys the integrity and uniformity of the polyamide layer of the desalination layer, so the reverse osmosis membrane Salt blocking rate is not high

Method used

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  • Microbial contamination resistance composite reverse osmosis membrane and preparation method thereof
  • Microbial contamination resistance composite reverse osmosis membrane and preparation method thereof
  • Microbial contamination resistance composite reverse osmosis membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1: prepare the composite reverse osmosis membrane resistant to microbial contamination according to the following steps:

[0026] (1) Preparation of A solution: get m-phenylenediamine 21.9g and dissolve it in 657g water to prepare an aqueous solution whose weight concentration is 3%. 7.3g of pyrrolidone, 14.6g of 2% triethylamine and 29.2g of 4% camphorsulfonic acid were stirred and dissolved to obtain A solution.

[0027] (2) Preparation of solution B: 0.9 g of trimesoyl chloride was dissolved in 597 g of cyclohexane to prepare an organic solution with a weight concentration of 0.15%, and solution B was obtained after stirring and dissolving.

[0028] (3) Preparation of solution C: Dissolve 21.9 g of m-phenylenediamine in 642.4 g of water to prepare an aqueous solution with a weight concentration of 3%. Base pyrrolidone 7.3g, 2% triethylamine 14.6g and 4% camphorsulfonic acid 29.2g, then add 2% 2000ppm nano-silver aqueous solution 14.6g in aqueous solution,...

Embodiment 2

[0031] Embodiment 2: prepare the composite reverse osmosis membrane resistant to microbial contamination according to the following steps:

[0032] (1) Preparation of A solution: same as Example 1.

[0033] (2) Preparation of B solution: same as in Example 1.

[0034] (3) Preparation of C solution: same as in Example 1.

[0035] (4) Contact the porous polysulfone supporting layer with solution A for 20 seconds, remove excess solution with a rubber roller, then contact this polysulfone supporting layer with solution B for 10 seconds to form the first layer of polyamide surface layer, and wait for the organic solvent to volatilize to After drying, it was contacted with solution C for 10 seconds to form a second polyamide surface layer, and then placed in an oven at 80° C. for 5 minutes to obtain a composite reverse osmosis membrane resistant to microbial contamination.

[0036] Take the diaphragm and test it on the diaphragm monitoring platform under the test conditions of 2000p...

Embodiment 3

[0037] Embodiment 3: prepare composite reverse osmosis membrane according to the following steps:

[0038] (1) Preparation of A solution: same as in Example 1.

[0039] (2) Preparation of B solution: same as in Example 1.

[0040] (3) Preparation of C solution: same as in Example 1.

[0041] (4) Contact the porous polysulfone support layer with solution A for 20 seconds, remove excess solution with a rubber roller, then contact the polysulfone support layer with solution B for 10 seconds to form the first layer of polyamide surface layer, and wait for the organic solvent to volatilize After that, it was contacted with solution C for 20 seconds to form a second layer of polyamide surface layer, and then dried in an oven at 80°C for 5 minutes to obtain a composite reverse osmosis membrane product.

[0042] Take the diaphragm and test it on the diaphragm monitoring platform under the test conditions of 2000ppm NaCl aqueous solution, 225psi operating pressure, temperature 25°C, ...

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Abstract

The invention discloses a microbial contamination resistance composite reverse osmosis membrane and a preparation method thereof. The microbial contamination resistance composite reverse osmosis membrane comprises a nonwoven fabric layer, a polysulfone supporting layer and two polyamide surface layer, wherein a second polyamide surface layer which is prepared by reacting nano inorganic antibacterial particle-modified polyamine solution with poly(acylchloride) is formed above a first polyamide surface layer. Compared with the prior art, the composite reverse osmosis membrane prepared by the invention is improved in microbial contamination resistance, surface thickness, mechanical damage resistance and service life for a layer of nano inorganic antibacterial particle-modified polyamide membrane is formed on the surface of the polysulfone supporting layer besides the layer of complete and uniform polyamide membrane. The composite reverse osmosis membrane of the invention has the characteristics of easy preparation and operation and high salt rejection rate and water permeability.

Description

technical field [0001] The invention relates to a composite reverse osmosis membrane resistant to microbial pollution and a preparation method thereof, belonging to the technical field of water treatment. Background technique [0002] Composite reverse osmosis membrane is the most widely used type of reverse osmosis membrane, and its known structure is to form a polyamide surface layer with better separation performance on a porous support (such as US5160619). Although the existing composite reverse osmosis membranes have high salt rejection rate and water permeation rate, membrane fouling is still one of the key problems that plague the application of composite reverse osmosis membranes. After years of research by scientific researchers, although the performance of anti-inorganic and anti-organic pollution of composite reverse osmosis membranes has been greatly improved, the research on anti-microbial pollution of reverse osmosis membranes is still in its infancy. Microbia...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D71/56B01D67/00C02F1/44
Inventor 邹昊金焱徐坚
Owner VONTRON TECH CO LTD
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