CN113893692A - Reverse osmosis membrane based on polysulfone material - Google Patents
Reverse osmosis membrane based on polysulfone material Download PDFInfo
- Publication number
- CN113893692A CN113893692A CN202110940937.7A CN202110940937A CN113893692A CN 113893692 A CN113893692 A CN 113893692A CN 202110940937 A CN202110940937 A CN 202110940937A CN 113893692 A CN113893692 A CN 113893692A
- Authority
- CN
- China
- Prior art keywords
- reverse osmosis
- layer
- polysulfone
- osmosis membrane
- solution
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
- B01D61/025—Reverse osmosis; Hyperfiltration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D67/00—Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
- B01D67/0002—Organic membrane manufacture
- B01D67/0009—Organic membrane manufacture by phase separation, sol-gel transition, evaporation or solvent quenching
- B01D67/0011—Casting solutions therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D67/00—Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
- B01D67/0002—Organic membrane manufacture
- B01D67/0009—Organic membrane manufacture by phase separation, sol-gel transition, evaporation or solvent quenching
- B01D67/0013—Casting processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D67/00—Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
- B01D67/0081—After-treatment of organic or inorganic membranes
- B01D67/0083—Thermal after-treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
- B01D69/10—Supported membranes; Membrane supports
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
- B01D69/10—Supported membranes; Membrane supports
- B01D69/105—Support pretreatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
- B01D69/12—Composite membranes; Ultra-thin membranes
- B01D69/125—In situ manufacturing by polymerisation, polycondensation, cross-linking or chemical reaction
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/06—Organic material
- B01D71/66—Polymers having sulfur in the main chain, with or without nitrogen, oxygen or carbon only
- B01D71/68—Polysulfones; Polyethersulfones
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2325/00—Details relating to properties of membranes
- B01D2325/24—Mechanical properties, e.g. strength
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Water Supply & Treatment (AREA)
- Dispersion Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Inorganic Chemistry (AREA)
- Nanotechnology (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention relates to the technical field of reverse osmosis membranes, in particular to a reverse osmosis membrane based on polysulfone material, wherein a support body is a polyester knitted fabric subjected to stiffening finishing; a polysulfone layer formed on the support and having pores formed in a surface thereof; the dense layer is arranged on the polysulfone layer and plays a role in desalting, and the dense layer is a polyamide layer doped with graphene oxide. The polyester knitted fabric subjected to stiffening finishing is used as a support body, so that the overall strength of the reverse osmosis membrane is enhanced; the polysulfone layer is used as the supporting layer, so that the manufacturing cost of the reverse osmosis membrane is reduced, and the membrane preparation process is simplified, wherein the polysulfone material has good mechanical strength and is green and environment-friendly; the polyamide layer doped with the graphene oxide is used as the compact layer, and the graphene has extremely strong hydrophilicity and extremely good bacteriostatic activity, so that the water flux of the reverse osmosis membrane is enhanced, and the problem that the reverse osmosis membrane reduces the reverse osmosis efficiency due to the fact that the water flux is reduced due to dirt accumulation after the reverse osmosis membrane is used for a long time is solved.
Description
Technical Field
The invention relates to the technical field of reverse osmosis membranes, in particular to a reverse osmosis membrane based on polysulfone materials.
Background
The reverse osmosis membrane is an artificial semipermeable membrane with certain characteristics and is made by simulating a biological semipermeable membrane, and is a core component of a reverse osmosis technology. The principle of reverse osmosis is that under the action of the osmotic pressure higher than that of the solution, other substances are separated from water based on the fact that the substances cannot permeate a semipermeable membrane. The reverse osmosis membrane has a very small membrane pore size, and thus can effectively remove dissolved salts, colloids, microorganisms, organic substances, and the like in water.
The composite membrane is mainly made of the two materials and is formed by compounding a thin compact layer and a porous supporting layer. The porous support layer is also called as a base film and plays a role in enhancing the mechanical strength; the dense layer is also called a skin layer and plays a role of desalination, so the dense layer is also called a desalination layer. The composite membrane can select a material with good desalting performance and a material with high mechanical strength respectively according to the requirements of the dense layer and the supporting layer, and is widely used.
However, since the reverse osmosis membrane has a multi-layer structure, the thickness thereof is larger than that of a general single-layer membrane, and although the desalination performance is improved, the reverse osmosis membrane has a reduced water flux due to the accumulation of dirt after a long-term use, and thus the reverse osmosis efficiency is lowered.
Aiming at the problems, the reverse osmosis membrane based on the polysulfone material is designed.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a reverse osmosis membrane based on polysulfone material.
The invention solves the technical problems through the following technical means:
a polysulfone-based reverse osmosis membrane comprising
The support body is a polyester knitted fabric subjected to stiffening finishing;
a polysulfone layer formed on the support and having pores formed in a surface thereof, a total area of the pores formed in the surface of the polysulfone layer occupying 5 to 15% of a total area of the surface of the polysulfone layer, the support and the polysulfone layer constituting a base film for enhancing mechanical strength;
the dense layer is arranged on the polysulfone layer and plays a role in desalination, the dense layer is a polyamide layer doped with graphene oxide, and the doping amount of the graphene oxide in the dense layer is 0.05-0.1% wt.
As an improvement of the above technical solution, the preparation method of the support body comprises the following steps:
preparing a stiffening finishing agent: according to the following steps of water-based epoxy resin emulsion: aqueous epoxy curing agent ═ 1: 0.6, mixing and stirring uniformly to prepare the epoxy resin finishing agent; according to the weight ratio of polyvinyl acetate: uniformly mixing and stirring the epoxy resin finishing agent in a ratio of 7:1 to prepare a stiffening finishing agent;
mixing a stiffening finishing agent and water according to the proportion of 500g/L to form a mixed solution;
and (3) immersing the terylene mesh knitted fabric into the mixed solution, rolling out the redundant mixed solution, pre-drying the terylene mesh knitted fabric immersed with the mixed solution for 1 minute at 110 ℃, and then baking the terylene mesh knitted fabric for 1.5 minutes at 190 ℃.
The preparation method of the reverse osmosis membrane based on the polysulfone material comprises the following steps:
s1, preparing polysulfone, an organic solvent and a pore-forming agent into a membrane casting solution according to a certain proportion;
s2, coating the casting solution on a support until the casting solution is solidified into a film, and forming a base film;
s3, preparing a solution A with aromatic amine as a solute and water as a solvent; preparing a solution B with aromatic acyl chloride as a solute and an organic solvent as a solvent, and adding graphene oxide;
and S4, sequentially immersing the base membrane into the solution A and the solution B, standing at room temperature for 5-10 minutes to react to obtain a compact layer, and performing heat treatment to obtain the reverse osmosis membrane.
The invention has the beneficial effects that:
according to the invention, the polyester knitted fabric subjected to stiffening finishing is used as a support body, so that the overall strength of the reverse osmosis membrane is enhanced; the polysulfone layer is used as the supporting layer, so that the manufacturing cost of the reverse osmosis membrane is reduced, and the membrane preparation process is simplified, wherein the polysulfone material has good mechanical strength and is green and environment-friendly; the polyamide layer doped with the graphene oxide is used as the compact layer, and the graphene has extremely strong hydrophilicity and excellent bacteriostatic activity, so that the water flux of the reverse osmosis membrane is enhanced, and the problem that the reverse osmosis membrane has low reverse osmosis efficiency due to the fact that the water flux is reduced due to dirt accumulation after the reverse osmosis membrane is used for a long time is solved;
according to the polyester knitted fabric subjected to stiffening finishing, a film is formed or cross-linking is generated inside the fibers, among the fibers or on the surface of the fibers by the stiffening finishing agent through a padding method, so that the finished object obtains good hardness, and the strength of the finished object is improved;
the bending length of the polyester knitted fabric can be effectively improved by setting the proportion of the stiffening finishing agent, a certain amount of epoxy resin is added into the finishing agent, so that the thermal stability of the polyester knitted fabric applied to a high-temperature water environment after finishing is improved, a layer of compact film is formed on the surface of the finished polyester knitted fabric, and the membrane has the stiffness required by a reverse osmosis membrane support body fabric;
the preparation method of the reverse osmosis membrane based on the polysulfone material is simple in process and convenient to operate, and the reverse osmosis membrane prepared by the process is high in mechanical strength, and enhances the water flux while improving the desalting performance.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are a part of the embodiments of the present invention, but not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
Examples
A polysulfone-based reverse osmosis membrane comprising
The support body is a polyester knitted fabric subjected to stiffening finishing;
a polysulfone layer formed on the support and having holes formed in a surface thereof, the total area of the holes formed in the surface of the polysulfone layer occupying 5 to 15% of the total area of the surface of the polysulfone layer, the support and the polysulfone layer constituting a base film for enhancing mechanical strength;
the dense layer is arranged on the polysulfone layer and plays a role in desalting, the dense layer is a polyamide layer doped with graphene oxide, and the doping amount of the graphene oxide in the dense layer is 0.05-0.1% wt.
According to the invention, the polyester knitted fabric subjected to stiffening finishing is used as a support body, so that the overall strength of the reverse osmosis membrane is enhanced; the polysulfone layer is used as the supporting layer, so that the manufacturing cost of the reverse osmosis membrane is reduced, and the membrane preparation process is simplified, wherein the polysulfone material has good mechanical strength and is green and environment-friendly; the polyamide layer doped with the graphene oxide is used as the compact layer, and the graphene has extremely strong hydrophilicity and extremely good bacteriostatic activity, so that the water flux of the reverse osmosis membrane is enhanced, and the problem that the reverse osmosis membrane reduces the reverse osmosis efficiency due to the fact that the water flux is reduced due to dirt accumulation after the reverse osmosis membrane is used for a long time is solved.
The preparation method of the support comprises the following steps:
preparing a stiffening finishing agent: according to the following steps of water-based epoxy resin emulsion: aqueous epoxy curing agent ═ 1: 0.6, mixing and stirring uniformly to prepare the epoxy resin finishing agent; according to the weight ratio of polyvinyl acetate: uniformly mixing and stirring the epoxy resin finishing agent in a ratio of 7:1 to prepare a stiffening finishing agent;
mixing a stiffening finishing agent and water according to the proportion of 500g/L to form a mixed solution;
and (3) immersing the terylene mesh knitted fabric into the mixed solution, rolling out the redundant mixed solution, pre-drying the terylene mesh knitted fabric immersed with the mixed solution for 1 minute at 110 ℃, and then baking the terylene mesh knitted fabric for 1.5 minutes at 190 ℃.
According to the polyester knitted fabric subjected to stiffening finishing, a film is formed or cross-linking is generated inside the fibers, among the fibers or on the surface of the fibers by the stiffening finishing agent through a padding method, so that the finished object obtains good hardness, and the strength of the finished object is improved;
the bending length of the polyester knitted fabric can be effectively improved by setting the proportion of the stiffening finishing agent, a certain amount of epoxy resin is added into the finishing agent, so that the thermal stability of the polyester knitted fabric applied to a high-temperature water environment after finishing is improved, a layer of compact film is formed on the surface of the finished polyester knitted fabric, and the polyester knitted fabric has the stiffness required by a reverse osmosis membrane support body fabric.
The preparation method of the reverse osmosis membrane based on the polysulfone material comprises the following steps:
s1, preparing polysulfone, an organic solvent and a pore-forming agent into a membrane casting solution according to a certain proportion;
s2, coating the casting solution on a support until the casting solution is solidified into a film, and forming a base film;
s3, preparing a solution A with aromatic amine as a solute and water as a solvent; preparing a solution B with aromatic acyl chloride as a solute and an organic solvent as a solvent, and adding graphene oxide;
and S4, sequentially immersing the base membrane into the solution A and the solution B, standing at room temperature for 5-10 minutes to react to obtain a compact layer, and performing heat treatment to obtain the reverse osmosis membrane.
The preparation method of the reverse osmosis membrane based on the polysulfone material is simple in process and convenient to operate, and the reverse osmosis membrane prepared by the process is high in mechanical strength, and enhances the water flux while improving the desalting performance.
It is noted that, in this document, relational terms such as first and second, and the like, if any, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (3)
1. The reverse osmosis membrane based on polysulfone material is characterized in that: comprises that
The support body is a polyester knitted fabric subjected to stiffening finishing;
a polysulfone layer formed on the support and having pores formed in a surface thereof, a total area of the pores formed in the surface of the polysulfone layer occupying 5 to 15% of a total area of the surface of the polysulfone layer, the support and the polysulfone layer constituting a base film for enhancing mechanical strength;
the dense layer is arranged on the polysulfone layer and plays a role in desalination, the dense layer is a polyamide layer doped with graphene oxide, and the doping amount of the graphene oxide in the dense layer is 0.05-0.1% wt.
2. A reverse osmosis membrane based on a polysulfone material according to claim 1, wherein: the preparation method of the support comprises the following steps:
preparing a stiffening finishing agent: according to the following steps of water-based epoxy resin emulsion: aqueous epoxy curing agent ═ 1: 0.6, mixing and stirring uniformly to prepare the epoxy resin finishing agent; according to the weight ratio of polyvinyl acetate: uniformly mixing and stirring the epoxy resin finishing agent in a ratio of 7:1 to prepare a stiffening finishing agent;
mixing a stiffening finishing agent and water according to the proportion of 500g/L to form a mixed solution;
and (3) immersing the terylene mesh knitted fabric into the mixed solution, rolling out the redundant mixed solution, pre-drying the terylene mesh knitted fabric immersed with the mixed solution for 1 minute at 110 ℃, and then baking the terylene mesh knitted fabric for 1.5 minutes at 190 ℃.
3. A method of preparing a polysulfone-based reverse osmosis membrane according to claim 2, wherein: the method comprises the following steps:
s1, preparing polysulfone, an organic solvent and a pore-forming agent into a membrane casting solution according to a certain proportion;
s2, coating the casting solution on a support until the casting solution is solidified into a film, and forming a base film;
s3, preparing a solution A with aromatic amine as a solute and water as a solvent; preparing a solution B with aromatic acyl chloride as a solute and an organic solvent as a solvent, and adding graphene oxide;
and S4, sequentially immersing the base membrane into the solution A and the solution B, standing at room temperature for 5-10 minutes to react to obtain a compact layer, and performing heat treatment to obtain the reverse osmosis membrane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110940937.7A CN113893692A (en) | 2021-08-17 | 2021-08-17 | Reverse osmosis membrane based on polysulfone material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110940937.7A CN113893692A (en) | 2021-08-17 | 2021-08-17 | Reverse osmosis membrane based on polysulfone material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113893692A true CN113893692A (en) | 2022-01-07 |
Family
ID=79187573
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110940937.7A Pending CN113893692A (en) | 2021-08-17 | 2021-08-17 | Reverse osmosis membrane based on polysulfone material |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113893692A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105536540A (en) * | 2016-01-25 | 2016-05-04 | 浙江绿龙新材料有限公司 | Enhanced anti-pollution reverse osmosis membrane backing material and manufacturing technique thereof |
| CN105688694A (en) * | 2016-01-22 | 2016-06-22 | 唐山海清源科技股份有限公司 | High-hydrophilic compound reverse osmosis membrane and preparation method of high-hydrophilic compound reverse osmosis membrane |
| CN106914153A (en) * | 2017-04-12 | 2017-07-04 | 江苏拓邦环保科技有限公司 | A kind of complex reverse osmosis membrane |
| CN107126851A (en) * | 2017-05-03 | 2017-09-05 | 江苏拓邦环保科技有限公司 | A kind of complex reverse osmosis membrane and preparation method thereof |
| CN107486041A (en) * | 2017-10-17 | 2017-12-19 | 常州市美纤膜技术有限公司 | A kind of ultralow pressure complex reverse osmosis membrane and preparation method thereof |
| CN109023949A (en) * | 2017-03-06 | 2018-12-18 | 浙江绿龙新材料有限公司 | The preparation method of improved reverse osmosis membrane supporter |
-
2021
- 2021-08-17 CN CN202110940937.7A patent/CN113893692A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105688694A (en) * | 2016-01-22 | 2016-06-22 | 唐山海清源科技股份有限公司 | High-hydrophilic compound reverse osmosis membrane and preparation method of high-hydrophilic compound reverse osmosis membrane |
| CN105536540A (en) * | 2016-01-25 | 2016-05-04 | 浙江绿龙新材料有限公司 | Enhanced anti-pollution reverse osmosis membrane backing material and manufacturing technique thereof |
| CN109023949A (en) * | 2017-03-06 | 2018-12-18 | 浙江绿龙新材料有限公司 | The preparation method of improved reverse osmosis membrane supporter |
| CN106914153A (en) * | 2017-04-12 | 2017-07-04 | 江苏拓邦环保科技有限公司 | A kind of complex reverse osmosis membrane |
| CN107126851A (en) * | 2017-05-03 | 2017-09-05 | 江苏拓邦环保科技有限公司 | A kind of complex reverse osmosis membrane and preparation method thereof |
| CN107486041A (en) * | 2017-10-17 | 2017-12-19 | 常州市美纤膜技术有限公司 | A kind of ultralow pressure complex reverse osmosis membrane and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 侯勇;邢铁玲;陈国强;沈光明;: "反渗透膜支撑体的制备", 印染助剂 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9079139B2 (en) | Reverse osmosis membrane | |
| KR100990168B1 (en) | Forward osmosis membranes and method for fabricating the same | |
| KR101392943B1 (en) | Hollow fiber membrane for forward osmotic use, and method for manufacturing the same | |
| EP2857088B1 (en) | Method for manufacturing a reverse osmosis membrane | |
| US10143974B2 (en) | Forward osmosis-based separation membrane based on multilayer thin film, using crosslinking between organic monomers, and preparation method therefor | |
| JP2013510717A5 (en) | ||
| WO2012079422A1 (en) | Method for preparing liquid separation membrane complexed and reinforced with polyvinylidene fluoride | |
| CN101745324B (en) | Preparation method of dry high-hydrophilic polyvinylidene fluoride hollow fibrous membrane | |
| EP3348323A1 (en) | Film-forming stock solution for use in non-solvent-induced phase separation methods, and method for producing porous hollow fiber membrane using same | |
| KR101448017B1 (en) | Forward osmosis membranes and preparation method thereof | |
| JP2007245107A (en) | Hollow fiber porous membrane | |
| CN112546876B (en) | Modified reverse osmosis composite membrane and preparation method thereof | |
| KR101391653B1 (en) | Hollow fiber type forward osmosis membrane and manufacturing method thereof | |
| CN113893692A (en) | Reverse osmosis membrane based on polysulfone material | |
| JP2015181990A (en) | Carboxymethyl cellulose composite separation membrane and film separation method using the same | |
| CN110394066B (en) | Composite nanofiltration membrane and preparation method and application thereof | |
| KR101434184B1 (en) | Forward osmosis membrane and manufacturing method thereof | |
| KR102309602B1 (en) | Reverse-osmosis membrane having excellent salt rejection and method for manufacturing thereof | |
| CN113634140B (en) | Internal support polyvinylidene fluoride hollow dry film and preparation method thereof | |
| CN210752133U (en) | Device for producing polyolefin substrate composite reverse osmosis membrane | |
| CN104548971B (en) | A kind of reverse osmosis membrane and its preparation method and application | |
| KR101334924B1 (en) | Polyester reverse osmosis composite membrane and preparation method thereof | |
| CN111282453A (en) | Preparation method of high-performance seawater desalination membrane and prepared seawater desalination membrane | |
| KR101817311B1 (en) | Polyethersulfone-based porous film having high flux property, preparation method and use thereof | |
| KR100447933B1 (en) | Method for preparation of polyacrylonitrile asymmetric nanofiltration membrane for organic separation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |