KR20140105082A - Reverse osmosis membranes based on multilayered thin films using a layerbylayer crosslinking assembly of organic monomers and method for preparing the same - Google Patents

Abstract

The present invention provides a method for preparing a reverse osmosis separation membrane which achieves highly improved water transmittance and fouling resistance as well as high level of salt rejection. To this end, the method for preparing a reverse osmosis separation membrane comprises: a middle layer forming step of forming a middle layer on a porous supporter; a first selection layer forming step of dipping the porous supporter on which the middle layer is formed in an organic solvent including first organic monomers to form a first selection layer on the middle layer; and a second selection layer forming step of dipping the porous supporter on which the first selection layer is formed in an organic solvent including second organic monomers to form a second selection layer on the first selection layer, wherein the first and second selection layer forming steps are alternately repeated one time or more.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reverse osmosis membrane-based reverse osmosis membrane using cross-linking between organic monomers and a method for preparing the same,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-layer thin film-based reverse osmosis membrane using crosslinking between organic monomers and a method for producing the same, and more particularly to a multi- By introducing the intermediate layer on the porous support, it is possible to obtain a water permeability that is far superior to that of the existing reverse osmosis membrane by using a minimum number of laminated layers, as well as an improved resistance to contamination and a high salt removal rate Layer membrane-based reverse osmosis membrane using crosslinking between organic monomers and a method for producing the same.

The phenomenon that the solvent moves between the two solutions separated by the semi-permeable membrane through the membrane from the solution with a low solute concentration to the solution with a high solute concentration is called osmotic phenomenon. The pressure acting on the solution side Is called osmotic pressure.

If you apply an external pressure higher than this osmotic pressure, the solvent will move to the solution with low concentration of solute, which is called reverse osmosis. By using the principle of reverse osmosis, it is possible to isolate various salts and organic substances through the semipermeable membrane using the pressure gradient as a driving force. The reverse osmosis membrane using this reverse osmosis membrane is used as a key material for supplying water for domestic, architectural and industrial purposes by separating molecular level substances and removing salts from brine or seawater.

Commercialized membranes have generally been produced in the form of complexes that produce polyamide selective layers by interfacial polymerization between a m-phenylene diamine (MPD) monomer on an aqueous solution and a trimesoyl chloride (TMC) monomer on an organic solvent on a porous support.

These polyamide-based membranes have been widely used as reverse osmosis membranes for over 30 years because of their excellent salt removal performance. However, relatively low water permeability and severe performance degradation due to membrane fouling have been pointed out as problems.

Therefore, it is necessary to develop a new reverse osmosis membrane having high water removal rate, high water permeability and resistance to pollution in order to reduce the energy and cost required for the desalination process of seawater.

As a related art reverse osmosis membrane separation technology, it has been difficult to control the selective layer thickness, surface structure, and cross-link density structure due to the bulk synthesis characteristics of the selective layer production method by interfacial polymerization. Recently, attempts have been made to fabricate a multilayer thin film selective layer based on a layer-by-layer (LbL) technique using electrostatic attraction between polymer electrolytes in an aqueous solution. However, due to the limitation that the material to be laminated must be water-soluble, the physicochemical structure of the thin film that can be produced is limited, and as a result, there is a problem that the salt removal rate and water permeability of the separation membrane do not reach the performance level of the conventional commercialized reverse osmosis membrane.

Recently, a method of producing a multilayer thin film having various chemical structures by repeating crosslinking between organic monomers on an organic solvent has been reported. However, optimization of the process (support, organic monomer, solvent, concentration, etc.) There is a problem that an excessive laminating process is required due to the pore filling in the pores of the support when the LbL multilayer thin film is laminated on the porous support. Such overlaying not only increases manufacturing process cost, but also has the adverse effect of drastically lowering the water permeability of the produced separator.

As a result, the present inventors have made intensive efforts to solve the above problems. As a result, they have found that a multi-layer thin film-based reverse osmosis membrane is produced by using covalent bonds between organic monomers. In the case of introducing an intermediate layer on a porous support, The present invention has been accomplished on the basis of the fact that it is possible to obtain not only an improved water permeability but also an improved contamination resistance and a high salt removal rate as compared with the conventional reverse osmosis membrane.

Korean Patent Registration No. 10-1076221

Park et al. Journal of Materials Chemistry, 20, 2085-2091 (2010) Johnson et al. Journal of Polymer Science B, 50, 168-173 (2012) Qian et al. Langmuir, 28, 17803-17810 (2012)

The present invention provides a reverse osmosis membrane-based reverse osmosis membrane having various chemical structures by using cross-linking between organic monomers in the production of a reverse osmosis membrane used for desalination of seawater. By introducing an intermediate layer on a porous support, The present invention also provides a reverse osmosis membrane and a method of manufacturing the same that prevent pore filling of support pores occurring in the LbL multilayer thin film deposition process and achieve a high water permeability, fouling resistance and salt removal rate using a minimum number of laminated water The purpose.

According to an embodiment of the present invention, there is provided a method of fabricating a semiconductor device, comprising: forming an intermediate layer on a porous support; Forming a first selective layer on the intermediate layer by dipping the porous support having the intermediate layer formed thereon into an organic solvent containing a first organic monomer; And forming a second selective layer on the first selective layer by dipping the porous support having the first selective layer on an organic solvent containing a second organic monomer to form a second selective layer on the first selective layer; The present invention also provides a method for producing a reverse osmosis membrane.

In an exemplary embodiment, it is preferable to further include a cleaning step of washing the porous support, on which the selective layer is formed, with an organic solvent after each of the first and second selective layer formation steps, wherein the cleaning step further includes a cleaning liquid Do.

In an exemplary embodiment, it is preferable that the first selective layer formation step and the second selective layer formation step are alternately repeated one or more times.

In an exemplary embodiment, the porous support preferably comprises polyacrylonitrile (PAN), polyvinylidene fluoride (PVDF), or polysulfone.

In an exemplary embodiment, in the intermediate layer forming step, the intermediate layer is preferably a nanotube film formed by interfacial polymerization or self-assembly.

In an exemplary embodiment, the intermediate layer is preferably a polymer nanotube film formed by interfacial polymerization between a polyfunctional amine and a polyfunctional acid chloride.

In an exemplary embodiment, the intermediate layer is preferably a polymer nanofilm formed by self-assembly of a positive electrode polymer electrolyte and a negative electrode polymer electrolyte on a charged support surface.

In an exemplary embodiment, the thickness of the intermediate layer formed in the intermediate layer forming step is preferably 100 nm or less.

In an exemplary embodiment, it is preferable that the total thickness of the selective layer finally formed through one or more times of each of the first and second selective layer formation steps is 100 nm or less.

In an exemplary embodiment, the first organic monomer preferably comprises an aromatic diamine.

In an exemplary embodiment, the second organic monomer preferably comprises a multifunctional chloride.

In an exemplary embodiment, the physicochemical structure of the formed first and second selective layers and the separation performance of the finally prepared reverse osmosis separator may be selected from the group consisting of an intermediate layer, a first organic monomer, a second organic monomer, a rinsing solution, It is preferable to control it by an organic solvent.

In another embodiment to achieve the object of the present invention, there is provided a reverse osmosis membrane produced by the above method.

The multi-layer thin film-based reverse osmosis membrane using the organic monomer crosslinking according to the present invention and the method for producing the same can provide not only a high salt removal rate but also a remarkably improved water permeability and a high water permeability as compared with the reverse osmosis membrane prepared by the conventional interfacial polymerization method. Reverse osmosis membranes can be produced which achieve pollution resistance.

Also, according to the multilayer thin film-based reverse osmosis membrane using the organic monomer crosslinking according to the present invention and the method for preparing the reverse osmosis membrane according to the present invention, by introducing the intermediate layer on the porous support in the production of the reverse osmosis membrane, It is possible to achieve the effect of preventing pore filling and to realize a selective layer thin film having excellent separation performance by using a minimum number of laminated layers.

1 shows a reverse osmosis membrane manufactured according to an embodiment of the present invention.
2 is a conceptual diagram illustrating a process for producing a reverse osmosis membrane according to an embodiment of the present invention.
Figure 3a shows a SEM image of a surface of a membrane selective layer formed by covalent self-assembly (LbL) between organic monomers according to one embodiment of the present invention.
Figure 3b shows a surface SEM image of a separation membrane selective layer formed by interfacial polymerization according to the prior art.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention.

In particular, the term " self-assembled " or " LbL ", as used throughout this specification, including claims and abstract, refers to a structure that is structurally very stable Layered ultra-thin film can be realized regardless of the size or shape of the support. The term " selective layer " as used in the present specification means a first selective layer Layer and the second selective layer.

According to an embodiment of the present invention, there is provided a method for manufacturing a semiconductor device, comprising: forming an intermediate layer on a porous support; Forming a first selective layer on the intermediate layer by dipping the porous support having the intermediate layer formed thereon into an organic solvent containing a first organic monomer; And forming a second selective layer on the first selective layer by dipping the porous support having the first selective layer on an organic solvent containing a second organic monomer to form a second selective layer on the first selective layer; The present invention also provides a method for producing a reverse osmosis membrane.

In addition, the method may further include a washing step of washing the porous support, on which the selective layer is formed, with an organic solvent after the first and second selective layer formation steps, respectively, wherein the washing solution further comprises a washing solution.

The first selective layer formation step and the second selective layer formation step may be alternately repeated one or more times.

More specifically, the method for producing the reverse osmosis membrane of the present invention will be described step by step.

First, an intermediate layer having a high water permeability is formed on the prepared porous support to block the surface pores of the porous support.

The porous support used in the present invention is not particularly limited as long as it is an ultrafiltration grade porous support having high dissolution resistance against an organic solvent. The porous support preferably comprises polyacrylonitrile (PAN), polyvinylidene fluoride (PVDF), or polysulfone. In an exemplary embodiment, the porous support may have a pore size of 1 to 500 nm.

The intermediate layer formed on the porous support blocks the surface pores of the porous support to thereby reduce the number of lamination and the number of laminations and effectively form the selective layer.

The intermediate layer is not particularly limited as long as it has a high water permeability and can block the pores of the porous support, but may be a polymer nanotubes formed by interfacial polymerization or self-assembly.

Though the thickness of the intermediate layer (polymer nanotubes) is not particularly limited, the thickness of the intermediate layer (polymer nanotubes) is preferably as thin as possible in terms of ensuring water permeability of the reverse osmosis membrane to be finally produced. In one embodiment, the thickness of the intermediate layer may range from 0.1 nm to 100 nm.

The intermediate layer (polymer nanotubes) may be formed by interfacial polymerization between a polyfunctional amine and a polyfunctional acid chloride, and the polyfunctional amine and polyfunctional acid chloride are not particularly limited. In one embodiment, the polyfunctional amine and polyfunctional acid chloride may be piperazine (PIP) amine and trimesoyl chloride (TMC), respectively, or piperazine (PIP) amine and It may be an aliphatic trifuctional chloride.

In addition, the intermediate layer (polymer nanotubes) may be formed by self-assembly between a positive electrode polymer electrolyte and a negative electrode polymer electrolyte on the surface of a charged support. In this case, the positive electrode polymer electrolyte is not limited to polyethyleneimine (PEI) Or poly (allylamine hydrochloride), hereinafter referred to as PAH). The negative electrode polymer electrolyte is not particularly limited, but may be poly (acrylic acid) (PAA). The charged support may be a general porous support (PAN, PVDF, Polysulfone) that can be used in the present invention. Since the porous support has a weak negative charge on a neutral aqueous solution, it can be used without any special treatment. In order to increase the negative charge intensity, it is possible to use an aqueous solution of NaOH, a UV-Ozone, or a surface treatment of oxygen plasma.

Then, the porous support having the intermediate layer formed thereon is dipped into an organic solvent containing a first organic monomer, and a first selective layer formation step of forming a first selective layer on the intermediate layer is performed.

Subsequently, after the first selective layer formation step, the porous support on which the first selective layer is formed is dipped into an organic solvent containing a second organic monomer to form a second selective layer on the first selective layer The second selective layer forming step is performed.

The first selective layer and the second selective layer forming step may be alternately repeated one or more times, and the number of laminated layers of the first and second selective layers and the types of the selective layers laminated at the start and the end may be adjusted .

In more detail, the porous support on which the intermediate layer is formed is dipped in the organic solvent in which the first organic monomer is dissolved for a predetermined time. The dip coating method is advantageous in terms of commercialization compared with the conventional spin-casting method and the like. On the intermediate layer of the porous support dipped in the organic solvent, a first selective layer is formed by covalent bonding or hydrogen bonding between the first organic monomer dissolved in the organic solvent and the surface of the intermediate layer.

After the first selective layer is formed, the organic layer may further include a washing step of washing the porous support having the first selective layer formed thereon with an organic solvent. In the cleaning step, the cleaning liquid may be further washed.

That is, in the cleaning step after the first selective layer formation step, the porous support having the selective layer formed thereon may be immersed in an organic solvent in order to remove unreacted first organic monomer, and may further include a cleaning liquid, The cleaning liquid is not particularly limited as long as it can clean the first organic monomer, but it is better that the solvent is highly soluble in the first organic monomer. As an embodiment of the cleaning liquid, it is preferable to use acetone, alcohol, tetrahydrofuran (THF) or water.

The porous support on which the first selective layer is formed is dipped in the organic solvent in which the second organic monomer is dissolved for a predetermined time. On the first selective layer of the porous support dipped in the organic solvent, a second selective layer is formed by covalent bonding between the second organic monomer dissolved in the organic solvent and the first organic monomer on the first selective layer, .

After the second selective layer is formed, the organic layer may further include a washing step of washing the porous support having the second selective layer formed thereon with an organic solvent. In the cleaning step, the cleaning liquid may be further washed.

That is, in the cleaning step after the second selective layer formation step, the porous support having the selective layer formed thereon may be immersed in an organic solvent in order to remove the unreacted second organic monomer. In this case, the cleaning solution may further include a cleaning liquid, The cleaning liquid is not particularly limited as long as it can clean the second organic monomer, but it is better that the solvent is highly soluble in the second organic monomer. As an embodiment of the cleaning liquid, it is preferable to use toluene, tetrahydrofuran (THF).

Thickness of the selective layer deposited at one time through the first selective layer formation step or the second selective layer formation step is not particularly limited, but it is preferable that the thickness of the selective layer is thinner in terms of securing the water permeability of the finally prepared reverse osmosis membrane. In one embodiment, the thickness of the selective layer deposited on one time may range from 0.1 nm to 3.0 nm.

The first and second selective layer forming steps may be alternately repeated one or more times, and a selective layer is additionally formed by covalent bonding between the first organic monomer and the second organic monomer in repeated layer stacking. Accordingly, although the total thickness of the finally stacked selective layers is not particularly limited, it is preferable that the thickness of the selective layer is thinner in terms of securing the water permeability of the finally prepared reverse osmosis membrane. In one embodiment, the total thickness of the selective layer may range from 0.1 nm to 100 nm.

The first organic monomer forming the first selective layer is dissolved in an organic solvent to form a covalent bond or a hydrogen bond with the surface of the intermediate layer on the intermediate layer when the porous support having the intermediate layer is dipped in an organic solvent Is not particularly limited as far as it can mutually covalently bond (cross-link) between the second organic monomers to be laminated thereafter to form the first selective layer, but preferably includes an aromatic diamine. In an exemplary embodiment, the first organic monomer may be an aromatic diamine comprising ortho-, meta- or para-phenylenediamines (OPD, MPD, PPD).

The second organic monomer forming the second selective layer is dissolved in an organic solvent and is dipped in an organic solvent when the porous support on which the first selective layer is formed is dipped. Is not particularly limited as far as it is capable of forming a second selective layer by covalently bonding (cross-linking) with the first organic monomer of the polyfunctional group, but preferably includes a multifunctional chloride. In an exemplary embodiment, the second organic monomer may be a multi-functional chlorine containing TMC.

It is preferable that the first and second organic monomers each have a size of 1 nm or less. By controlling the cross-linking reaction in the molecular size unit as described above, it is possible to produce a commercial reverse osmosis membrane, that is, Thereby enabling the structure control of the semiconductor device.

The organic solvent is not particularly limited as long as it can dissolve the first organic monomer and the second organic monomer without dissolving the porous support. In an exemplary embodiment, the organic solvent may be toluene, tetrahydrofuran (THF), or the like.

The physicochemical structure of the first and second selective layers to be formed and the separation performance of the finally formed reverse osmosis separator in the process of manufacturing the reverse osmosis membrane including the above- Organic monomers, rinsing solutions or organic solvents.

Particularly, the separation performance of the finally manufactured reverse osmosis membrane can be determined according to the number of times of lamination and thickness of the first and second selective layers, and the initial and final layer levels.

The above-described reverse osmosis membrane separation technology is a self-assembled (LbL) technique using cross-linking between organic monomers, and it is possible to control the structure at a smaller molecular level as compared with the prior art including a selective layer production technique by interfacial polymerization , And therefore it is easy to control the thickness, physicochemical structure, cross-link density or surface roughness of the produced reverse osmosis membrane.

In addition, when the selective layer is formed by the above-described self-assembly, a multilayer thin film layer having a minimum number of layers (thickness) and a high crosslinking density can be produced. Therefore, The diffusion resistance is lowered to maximize the water permeability. In addition, since the surface roughness of the multilayer thin film layer to be formed can be minimized, the stain resistance of the reverse osmosis membrane is improved.

Therefore, when the reverse osmosis membrane manufactured according to the present invention is applied to the desalination process, it is possible to reduce the energy and cost required for the desalination process.

In addition, in the reverse osmosis membrane production process, by introducing the intermediate layer on the porous support, it is possible to prevent the pore filling occurring in the subsequent selective layer (LbL multilayer thin film) laminating process, , Thereby preventing unnecessary over-stacking and improving manufacturing efficiency.

Example

Hereinafter, the present invention will be described in more detail with reference to Examples. It is to be understood by those skilled in the art that these embodiments are only for illustrating the present invention and that the scope of the present invention is not construed as being limited by these embodiments.

Example  One

To prepare a reverse osmosis membrane according to the present invention, polyacrylonitrile (PAN) is prepared as a porous support in Example 1, washed with purified water, and dipped in a 1 wt% PIP aqueous solution for 5 minutes. After removing the excess PIP solution on the surface using a roller, 0.05 wt% of TMC hexane solution is poured onto the surface of the support and reacted for 3 minutes. The surface is then washed with excess hexane and then dried in a 70 ° C oven for 2 minutes.

Through the above procedure, the support having the intermediate layer formed therein is first dipped in toluene for 20 minutes to sufficiently wet the support. Thereafter, the substrate is dipped in a 1 wt% MPD toluene solution for 40 seconds. After the reaction, the substrate is washed and dipped in acetone and toluene one by one in sequence. The sample is dipped in a 1 wt% TMC toluene solution for 40 seconds. Then, it is rinsed twice with toluene for 1 minute. (The above series of processes is defined as the number of layers 1). This multilayering process is repeated to produce a multilayer thin film, and in particular, the multilayer thin film has been prepared in ten layers (Example 1).

Example  2 and 3

Particularly, in Examples 2 and 3, the intermediate layer forming steps are different from those in Example 1. [ Specifically, the PAN support is immersed in a 2M NaOH aqueous solution at 40 degrees for 2 hours. The support is washed with an excess of purified water and dipped in a 0.2 wt% aqueous PAH solution (pH 7.5) for 10 minutes. Wash the sample twice for 1 minute with excess of purified water (pH 7.5). Thereafter, the sample was dipped in a 0.2 wt% PAA aqueous solution (pH 3.5) for 10 minutes, and then washed twice with excess purified water (pH 3.5) for 1 minute to form an intermediate layer. The selective layer forming steps in the following second and third embodiments proceed in the same manner as in the first embodiment. However, the cleaning liquid used in the cleaning step after the lamination of the first selective layer was different between toluene (Example 2) and acetone (Example 3).

Example  4

In Example 4, the PAN support is immersed in a 2M NaOH aqueous solution at 40 degrees for 2 hours. The support is washed with excess purified water and then dipped in 0.1 wt% PEI / 0.5 wt% NaCl aqueous solution (pH 7.0) for 30 min. The sample is washed 4 times for 2 minutes with excess of purified water (pH 7.0). Thereafter, it was dipped in a 0.1 wt% TMC toluene solution for 3 minutes, and then washed with an excess amount of toluene to form an intermediate layer. The selective layer formation step in the following fourth embodiment proceeds in the same manner as in the first embodiment. However, the number of laminated layers finally stacked was 0, 2, 5 and 10 layers (4a, 4b, 4c and 4d, respectively).

Comparative Example  One

Polyacrylonitrile (PAN), a porous support, was prepared according to the prior art and a selective layer was prepared on the porous support using interfacial polymerization between MPD and TMC. The separation performance of the membranes prepared by the LbL preparation method using the interfacial polymerization method and the crosslinked laminate, which is a commercial membrane production method, was compared. Polyacrylonitrile (PAN) was prepared as a porous support, washed with purified water, and dipped in a 1 wt% MPD aqueous solution for 5 minutes. After removing excess MPD solution on the surface using a roller, 0.1 wt% of TMC hexane solution is poured onto the surface of the support and reacted for 3 minutes. The surface was then washed with excess hexane and then dried in an oven at 70 ° C for 2 minutes to prepare a reverse osmosis membrane.

Experiment 1

The separation performance of the reverse osmosis membrane prepared according to Examples 1 to 4 and Comparative Example 1 was measured in seawater desalination. The reverse osmosis membrane prepared according to each of Examples 1 to 4 and Comparative Example 1 was cut into a sample having a diameter of 4.9 cm and mounted in a cross-flow cell. The feed water is 2,000 ppm NaCl aqueous solution and the process pressure is set to 15.5 bar. (L / m2h) and salt (NaCl,%) removal rate were measured by measuring the amount of solution filtered through the membrane after the 2-hour stabilization and the concentration of NaCl contained in the solution. Are shown in Table 1 below.

Support Middle layer The selective layer (LbL) menstruum Cleaning liquid fair Separation performance A B C D E F LbL Number of layers Water permeability
(L / m ² h) Salt removal rate
(NaCl,%)  Example 1 PAN PIP / TMC
(Interfacial polymerization) MPD TMC Toluene Acetone 10 40.2 90.0 Example 2 PAH / PAA MPD TMC Toluene Toluene 5 17.2 31.1 Example 3 PAH / PAA MPD TMC Toluene Acetone 5 5.8 98.2 Example 4a PEI / TMC MPD TMC Toluene Acetone 0 84.5 21.8 Example 4b 2 66.4 30.6 Example 4c 5 44.0 44.7 Example 4d 10 20.1 93.1 Comparative Example 1 PAN N / A MPD / TMC (interfacial polymerization) N / A N / A 12.0 94.0

The separation performance of the reverse osmosis membrane shown in the above table can be confirmed to be excellent in the salt removal ratio (98.2%) as compared with the reverse osmosis membrane of Comparative Example 1 according to the prior art.

In addition, it was confirmed that all the other examples except for the above-mentioned Example 3 had an improved water permeability as compared with the above-mentioned Comparative Example 1.

Particularly, in Example 1, the salt removal rate was slightly lower than Comparative Example 1, but the water permeability was increased by three times or more.

Also, in Example 4d, the water permeability was increased by 67% while showing the same salt removal ratio as in Comparative Example 1. [

Therefore, by further optimizing the conditions of the reverse osmosis membrane production process (organic monomer concentration, solvent, washing liquid, intermediate layer, lamination number, etc.) according to the present invention, the salt removal rate The reverse osmosis membrane with improved water permeability can be obtained.

Also, it is well known that the smooth surface of the reverse osmosis membrane has a higher fouling resistance than a rough surface. Therefore, referring to the results shown in FIGS. 3A and 3B, the contamination stability of the membrane according to the LbL production method It is expected to be superior to that of commercial membranes.

While the present invention has been particularly shown and described with reference to specific embodiments thereof, those skilled in the art will readily appreciate that many modifications are possible in the exemplary embodiments without materially departing from the novel teachings and advantages of this invention. something to do. Accordingly, the actual scope of the present invention will be defined by the appended claims and their equivalents.

A: porous support B: intermediate layer
C: first selective layer D: second selective layer
E: organic solvent F: rinsing solution

Claims (13)

An intermediate layer forming step of forming an intermediate layer on the porous support;
Forming a first selective layer on the intermediate layer by dipping the porous support having the intermediate layer formed thereon into an organic solvent containing a first organic monomer; And
Forming a second selective layer on the first selective layer by dipping the porous support on which the first selective layer is formed into an organic solvent containing a second organic monomer; Wherein the reverse osmosis membrane separator comprises: The method according to claim 1,
Further comprising a washing step of washing the porous support having the selective layer formed thereon after the first and second selective layer formation steps with an organic solvent,
Wherein the washing step further comprises washing the washing solution in the washing step. The method according to claim 1,
Wherein the first selective layer formation step and the second selective layer formation step are alternately repeated one or more times. The method according to claim 1,
Wherein the porous support comprises polyacrylonitrile (PAN), polyvinylidene fluoride (PVDF), or polysulfone. The method according to claim 1,
Wherein the intermediate layer is a nanofilm formed by interfacial polymerization or self-assembly in the intermediate layer forming step. 6. The method of claim 5,
Wherein the intermediate layer is a polymer nano-thin film formed by interfacial polymerization between a polyfunctional amine and a polyfunctional acid chloride. 6. The method of claim 5,
Wherein the intermediate layer is a polymer nanofilm formed by self-assembly of a positive electrode polymer electrolyte and a negative electrode polymer electrolyte on a surface of a support having charge. The method according to claim 1,
Wherein the thickness of the intermediate layer formed in the intermediate layer forming step is 100 nm or less. The method of claim 3,
Wherein the total thickness of the selective layer finally formed through the first and second selective layer forming steps at least once is 100 nm or less. The method according to claim 1,
Wherein the first organic monomer comprises an aromatic diamine. The method according to claim 1,
Wherein the second organic monomer comprises multifunctional chloride. ≪ RTI ID = 0.0 > 18. < / RTI > The method according to claim 1,
The physicochemical structure of the formed first and second selective layers and the separation performance of the finally prepared reverse osmosis separator are controlled by the intermediate layer, the first organic monomer, the second organic monomer, the rinsing solution or the organic solvent Wherein the reverse osmosis membrane is produced by a method comprising the steps of: A reverse osmosis membrane produced by a process according to any one of claims 1 to 12.

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