Method for preparing reverse osmosis membrane and reverse osmosis membrane prepared by the method

A technology of reverse osmosis membrane and mixed solvent, which is applied in the direction of reverse osmosis, semipermeable membrane separation, chemical instruments and methods, etc., can solve the problems of pollution, water purification function deterioration, low efficiency of initial permeation flux, etc., and achieve improvement of permeation flux. amount, the effect of excellent desalination rate

Active Publication Date: 2016-05-11
LG CHEM LTD
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  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the polyamide-based reverse osmosis membrane prepared by the above conventional methods may have the disadvantage of low initial permeate flux efficiency, resulting in deterioration of water purification function.
Also, in the case of water treatment using a reverse osmosis membrane, solutes or ionic compounds may be adsorbed to the surface of the reverse osmosis membrane to contaminate the reverse osmosis membrane, causing water permeation characteristics such as permeate flux and desalination rate to decrease over time

Method used

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  • Method for preparing reverse osmosis membrane and reverse osmosis membrane prepared by the method
  • Method for preparing reverse osmosis membrane and reverse osmosis membrane prepared by the method
  • Method for preparing reverse osmosis membrane and reverse osmosis membrane prepared by the method

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[0024] The method for preparing a reverse osmosis membrane according to an embodiment of the present invention includes: (1) forming a polysulfone layer by applying a mixed solvent containing two or more solvents having different solubility parameter values ​​to the surface of a porous support and (2) forming an active layer on said polysulfone layer.

[0025] Here, conventional porous supports known in the art can be used without limitation. For example, the porous support may be a nonwoven fabric. Materials for the nonwoven fabric may include polyester, polycarbonate, microporous polypropylene, polyphenylene oxide, polyvinylidene fluoride, and the like, but are not limited thereto.

[0026] In addition, the formation of the polysulfone layer may be performed using a solution containing a sulfonic acid group-containing polymer and a mixed solvent containing two or more solvents having different solubility parameter values.

[0027] For example, the polymer containing sulfon...

Embodiment 1

[0050] The solubility parameter value is 24.9 (J / cm 3 ) 1 / 2 ) N, N-dimethylformamide (DMF) and solubility parameter value is 26.7 (J / cm 3 ) 1 / 2 ) and dimethyl sulfoxide (DMSO) at a ratio of 90:10 to prepare a mixed solvent, then add 18 wt% polysulfone to it, and stir at 80°C for 12 hours or more to prepare a uniformly mixed liquid phase solution. This solution was cast on a nonwoven polyester fabric having a thickness of 100 μm to obtain a fabricated fabric having a thickness of 150 μm, and the resulting fabric was dipped in water to prepare a porous polysulfone support.

[0051] After the prepared porous polysulfone support was dipped into and removed from an aqueous solution containing 2 wt% m-phenylenediamine (mPD) for 2 minutes, the excess aqueous solution on the support was removed using a 25 psi roller and dried at room temperature 1 minute.

[0052] Then, the above-mentioned support body was dipped into an ISOL-C solution (SKCCorp.) containing 0.1wt% trimesoyl chlo...

Embodiment 2

[0054] A reverse osmosis membrane was prepared in the same manner as described in Example 1 except that DMF and DMSO were mixed in a ratio of 80:20.

[0055] Here, images of the polysulfone layer surface analyzed by scanning electron microscopy (SEM) are shown in figure 1middle.

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Abstract

The invention provides a method for preparing a reverse osmosis membrane and a reverse osmosis membrane prepared by the method. The method includes: forming a polysulfone layer by applying a solution containing a mixed solvent containing two or more solvents having different solubility parameter values ​​to the surface of a porous support; and forming a polysulfone layer on the polysulfone layer. active layer.

Description

technical field [0001] The present disclosure relates to a method for preparing a reverse osmosis membrane, and a reverse osmosis membrane prepared by the method, more specifically, relates to a method for preparing a reverse osmosis membrane and a reverse osmosis membrane prepared by the method, the method Adjusting the pore size distribution, density, pore area ratio, etc. of pores formed in the polysulfone layer by using a mixed solvent containing two or more solvents having different solubility parameter values ​​when forming the polysulfone layer on the porous support, Thereby, compared with the existing reverse osmosis membrane, the permeation flux is improved, and at the same time, it has excellent salt rejection rate, antifouling performance and durability. Background technique [0002] Osmosis is a phenomenon in which a solvent moves from a solution with a low solute concentration to another solution with a high solute concentration across a semipermeable separation...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/10B01D61/12B01D71/68
CPCB01D61/025B01D69/10B01D69/125B01D71/56B01D71/68B01D2325/02B01D61/02B01D69/12B05D5/00B05D2350/00
Inventor 郑胜杓李升烨李弼权慧珍申程圭
Owner LG CHEM LTD
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