Method for preparing reverse osmosis membrane, and reverse osmosis membrane prepared thereby

A technology of reverse osmosis membrane and supporting membrane, applied in semi-permeable membrane separation, chemical instruments and methods, membranes, etc., can solve the problems of reduced thickness uniformity of active layer, reduced osmotic flow rate efficiency, reduced productivity, etc., and achieve excellent desalination Excellent efficiency, uniformity, and productivity improvement

Inactive Publication Date: 2013-12-04
LG CHEM LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] However, since the reverse osmosis membrane prepared according to the prior art method includes a very thick active layer, it has disadvantages in that the permeation flow rate efficiency is lowered, the thickness uniformity of the active layer is lowered, and the Dipping time will be longer, reducing productivity

Method used

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  • Method for preparing reverse osmosis membrane, and reverse osmosis membrane prepared thereby
  • Method for preparing reverse osmosis membrane, and reverse osmosis membrane prepared thereby
  • Method for preparing reverse osmosis membrane, and reverse osmosis membrane prepared thereby

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preparation example Construction

[0017] figure 2 The preparation process of the reverse osmosis membrane described in one embodiment of the present invention is shown. Such as figure 2 As shown, the preparation method of the reverse osmosis membrane described in one embodiment of the present invention can comprise: form the first coating by coating the aqueous solution of amine on the surface of the microporous support membrane; Remove from the microporous support membrane an aqueous solution of an excess of amine; and forming a second coating layer by coating an aliphatic hydrocarbon-based organic solution containing an acid halide on the first coating layer.

[0018] First, the first coating layer is formed by coating an aqueous solution of amine on the surface of the microporous support membrane.

[0019] In this case, the microporous support membrane can be formed by casting a polymeric material on a nonwoven. As polymeric materials, for example polysulfone, polyethersulfone, polycarbonate, polyethyl...

example 1

[0040] Use the sixth rod to coat a 2% (weight) m-phenylenediamine aqueous solution containing 1% (weight) triethylamine on a porous polysulfone support membrane cast on a non-woven fabric and having a thickness of 140 μm to form a 13.72 μm thickness of the first coat. After removing the excess aqueous solution of amine on the support membrane, a 0.1% by weight solution of organic trimesoyl chloride using an isoparaffin solvent was applied on the first coating using a twelfth rod to have a thickness of 27.43 μm , so as to form a second coating, and then dried in an oven at 60° C. for 10 minutes, and washed in a 0.2% (by weight) sodium carbonate aqueous solution at room temperature for 2 hours or more, thereby making a reverse osmosis membrane. After preparing the reverse osmosis membrane, the reverse osmosis membrane had an active layer with a total thickness of 91 nm and an average surface roughness of 10 nm.

example 2

[0042] A reverse osmosis membrane was prepared using the same method as Example 1, except that the ninth bar was used to coat the m-phenylenediamine aqueous solution to have a thickness of 20.57 μm, and the sixth bar was used to coat the organic trimesoyl chloride solution to have 13.72 μm thickness. After preparing the reverse osmosis membrane, the reverse osmosis membrane had an active layer with a total thickness of 94 nm and an average surface roughness of 9 nm.

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Abstract

The present invention relates to a method for preparing a reverse osmosis membrane, and to a reverse osmosis membrane prepared thereby, the method comprising the steps of: forming a first coating layer, the thickness of which is 20 [mu]m to 30 [mu]m, by applying an aqueous amine solution onto one side of a microporous support body; removing the excess aqueous amine solution from the support body; and forming a second coating layer, the thickness of which is 10 [mu]m to 30 [mu]m, by applying an aliphatic hydrocarbon-based organic solution comprising acyl halide on the first coating layer.

Description

technical field [0001] The present invention relates to a preparation method of a reverse osmosis membrane and a reverse osmosis membrane prepared by the method, more specifically, to a preparation method of such a reverse osmosis membrane and a reverse osmosis membrane prepared by the method, the reverse osmosis membrane An active layer having a reduced thickness and excellent uniformity is included, thereby having an excellent permeation flow rate and an excellent desalination characteristic. Background technique [0002] The osmosis phenomenon refers to a phenomenon in which a solvent moves from a solution with a low solute concentration to a solution with a high solute concentration through a semipermeable separation membrane that separates the two solutions. In this case, the pressure acting on the solution with high solute concentration through the movement of the solvent is called osmotic pressure. However, when an external pressure greater than the osmotic pressure ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/02B01D69/12B01D69/10B01D71/68
CPCB01D2325/04B01D69/125B01D2325/06B01D61/025B01D71/56B01D69/02B01D69/12B01D69/10B01D71/68B01D69/1251
Inventor 俞贞恩申程圭郑胜杓李弼李暎周
Owner LG CHEM LTD
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