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Method for preparing contamination-resistant composite reverse osmosis membrane

A technology of reverse osmosis membrane and reverse osmosis composite membrane, which is applied in the field of preparation of composite reverse osmosis membrane, can solve the problems of losing anti-pollution, etc., and achieve the effect of improving hydrophilicity, improving the ability of anti-microbial pollution, and broad-spectrum antibacterial properties

Inactive Publication Date: 2014-04-02
CHANGZHOU SVECK PHOTOVOLTAIC NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the PVA molecular chain and the polyamide layer are combined by physical adsorption, the PVA layer is easy to gradually dissolve in water during the use of the membrane, and eventually loses the anti-pollution performance gradually.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1) A DMF solution containing 20% ​​polysulfone by mass fraction, 15% polyvinylpyrrolidone by mass fraction and 0.04% polyvinyl alcohol by mass fraction is coated on a polyester non-woven fabric. Then immerse in water to remove the benign solvent to obtain a polysulfone support membrane, and then put it into deionized water for standby.

[0024] 2) Coating the aqueous solution of 1.5% 3,5-diaminobenzoic acid on the polysulfone support membrane, air-dried for 15min in the air, and then using the n-hexane solution of 0.02% trimesoyl chloride Coated on a polysulfone support membrane, followed by the first heat treatment: at 50°C for 6 minutes, and then rinsed twice: the first was at 40°C with a mass fraction of 10% ethanol aqueous solution for 15 minutes, the second It is rinsed in an aqueous solution at 40°C for 15 minutes. Then heat treatment at 100° C. for 10 minutes to obtain an aromatic polyamide reverse osmosis composite membrane.

[0025] 3) Immerse the aromatic po...

Embodiment 2

[0027] 1) Same as operation 1) in Example 1.

[0028] 2) Coating the aqueous solution of 1.5% 3,5-diaminobenzoic acid on the polysulfone support membrane, air-dried for 15min in the air, and then using the n-hexane solution of 0.05% trimesoyl chloride Coated on a polysulfone support membrane, followed by the first heat treatment: at 50°C for 6 minutes, and then rinsed twice: the first was at 40°C with a mass fraction of 10% ethanol aqueous solution for 15 minutes, the second It is rinsed in an aqueous solution at 40°C for 15 minutes. Then heat treatment at 100° C. for 10 minutes to obtain an aromatic polyamide reverse osmosis composite membrane.

[0029] 3) Same as operation 3) in Example 1.

Embodiment 3

[0031] 1) Same as operation 1) in Example 1.

[0032] 2) Coating the aqueous solution of 1.5% 3,5-diaminobenzoic acid on the polysulfone supporting membrane, air-dried for 15min in the air, and then using the n-hexane solution of 0.1% trimesoyl chloride Coated on a polysulfone support membrane, followed by the first heat treatment: at 50°C for 6 minutes, and then rinsed twice: the first was at 40°C with a mass fraction of 10% ethanol aqueous solution for 15 minutes, the second It is rinsed in an aqueous solution at 40°C for 15 minutes. Then heat treatment at 100° C. for 10 minutes to obtain an aromatic polyamide reverse osmosis composite membrane.

[0033] 3) Same as operation 3) in Example 1.

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Abstract

The invention discloses a method for preparing a contamination-resistant composite reverse osmosis membrane. The method comprises the steps of (a) preparing a polysulfone support membrane; (b) preparing an aromatic polyamide reverse osmosis composite membrane by using the polysulfone support membrane obtained in Step (a); and (c) grafting chitosan on the surface of the aromatic polyamide reverse osmosis composite membrane obtained in Step (b). According to the method for preparing a contamination-resistant composite reverse osmosis membrane, chitosan is grafted on the surface of the polyamide reverse osmosis composite membrane through a chemical treatment method, so that hydrophilicity of the surface of the membrane as well as the water flux of the membrane is improved; meanwhile, contaminations such as hydrophobic organic matters and transition metal ions can be prevented from being absorbed on the surface of the membrane, thereby greatly improving the anti-pollution capability of the membrane; in addition, chitosan has broad-spectrum antibacterial property, so that the resistance of the membrane against microbial contamination is improved.

Description

technical field [0001] The invention relates to a preparation method of a pollution-resistant composite reverse osmosis membrane, belonging to the technical field of seawater desalination. Background technique [0002] Reverse osmosis is a mature membrane separation technology with the advantages of cleanness, energy saving, high efficiency, and no pollution. It is widely used in desalination of seawater and brackish water, urban sewage treatment, industrial water treatment, and preparation of pure water and ultrapure water. , drinking water purification, purification and concentration of pure products, etc., are called "water purification technology in the 21st century". Reverse osmosis membrane is the core of reverse osmosis technology. Composite reverse osmosis membrane has the characteristics of high water flux and desalination rate, low operating pressure and low operating cost, and has a high market share. At present, the aromatic polyamide composite reverse osmosis ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D67/00B01D71/56
Inventor 赵世界张好宾
Owner CHANGZHOU SVECK PHOTOVOLTAIC NEW MATERIAL
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