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Hydrophilic reverse osmosis composite membrane and preparation method thereof

A reverse osmosis composite membrane and hydrophilic polymer technology, applied in the field of membrane separation, can solve the problems of poor hydrophilicity and low anti-pollution ability, and achieve the effects of not easy to lose, improve anti-pollution ability, and high desalination rate

Inactive Publication Date: 2013-06-19
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of poor hydrophilicity and low anti-pollution ability of existing reverse osmosis composite membranes prepared from m-phenylenediamine and trimesoyl chloride, the present invention provides a salt water membrane with strong hydrophilicity and strong anti-pollution ability. Hydrophilic reverse osmosis composite membrane with high rejection rate and high water flux and preparation method thereof

Method used

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  • Hydrophilic reverse osmosis composite membrane and preparation method thereof
  • Hydrophilic reverse osmosis composite membrane and preparation method thereof
  • Hydrophilic reverse osmosis composite membrane and preparation method thereof

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preparation example Construction

[0068] The preparation process of the porous polysulfone support layer in this embodiment is as follows:

[0069] Prepared according to conventional methods, will contain 18.5% (weight percent) of polysulfone, 11.5% (weight percent) of ethylene glycol monomethyl ether, 0.03% (weight percent) of sodium dodecylsulfonate, 66.97% (weight percent) percent) of N,N-dimethylformamide casting liquid coating scraped on the polyester non-woven fabric, immerse it in deionized water at room temperature for phase inversion, remove the good solvent, and obtain a molecular weight cut-off of 20000-50000 The porous polysulfone support layer was stored in deionized water until use.

Embodiment 1

[0071] Example 1 Preparation of reverse osmosis composite membrane covalently grafted with polyethylene glycol 2000 on the surface by m-phenylenediamine and 2,2',5,5'-biphenyltetrayl chloride

[0072] Step 1. Evenly pour the aqueous solution of m-phenylenediamine with a mass volume concentration of 2.0g / 100mL on the surface of the porous polysulfone support layer with a molecular weight cut-off of 20,000 in wet state, cover for 1 minute, pour to remove excess amine liquid, and air dry Dry for 1 minute to obtain a porous polysulfone support layer whose surface is covered with m-phenylenediamine aqueous solution;

[0073] Step 2, pour the mixed solution of IsopaG and toluene of 2,2′,5,5′-biphenyltetrayl chloride with a mass volume concentration of 0.2g / 100mL evenly on the surface of the porous polysulfone support layer obtained in step 1, and carry out Interfacial polymerization reaction for 20 seconds to obtain a composite membrane covered with an active separation layer;

[0...

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Abstract

The invention relates to a hydrophilic reverse osmosis composite membrane and a preparation method of the hydrophilic reverse osmosis composite membrane, which relates to the field of membrane separation. In order to solve the problems of poor hydrophilicity and low pollution resistance of the existing reverse osmosis composite membrane prepared by metaphenylene diamine and trimesic acyl chloride, the invention provides the hydrophilic reverse osmosis composite membrane with strong hydrophilicity and pollution resistance and high salt rejection rate and water flux and the preparation method of the hydrophilic reverse osmosis composite membrane. The hydrophilic reverse osmosis composite membrane comprises a porous polysulfone supporting layer, an active separating layer and a hydrophilic coating layer, wherein the molecular weight cut-off of the porous polysulfone supporting layer is 20000-50000; the active separating layer is composited on the surface of the porous polysulfone supporting layer and is a polymer obtained by metaphenylene diamine and biphenyl multielement acyl chloride through interfacial polymerization; and the hydrophilic coating layer is coated on the surface of the active separating layer and is a hydrophilic polymer. The hydrophilic reverse osmosis composite membrane has the advantages that the hydrophilicity is strong, the pollution resistance is strong, the desalting rate reaches to be 99.83%, the water flux reaches to be 56.8L / m<2>h, and the comprehensive performance is obviously improved.

Description

technical field [0001] The invention relates to the technical field of membrane separation, in particular to a hydrophilic reverse osmosis composite membrane and a preparation method thereof. Background technique [0002] The reverse osmosis membrane is a kind of artificial semipermeable membrane prepared by polymer materials and capable of realizing the separation operation of the reverse osmosis membrane. Inexpensive, less affected by factors such as pH value and temperature, can function under lower operating pressure, and can withstand chemical or biochemical effects, etc. It is widely used in chemical industry, water treatment, seawater desalination, medicine, etc. field. [0003] There are two types of reverse osmosis membranes: the first type is cellulose acetate series membranes with asymmetric structure. This type of membrane is due to its narrow pH range, easy hydrolysis, high operating pressure requirements and low water flux. Its development is limited; the sec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D69/02B01D69/10B01D67/00B01D71/68B01D71/78
Inventor 李胜海张奇峰张所波郑吉富
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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