CN106310983A - Disposable polyethersulfone air microfiltration membrane and preparation method thereof - Google Patents
Disposable polyethersulfone air microfiltration membrane and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a disposable polyethersulfone air microfiltration membrane and a preparation method thereof. The air microfiltration membrane is prepared from the following raw materials in percentage by mass: 9-15% of polyethersulfone, 57-87.5% of a solvent, 1-10% of a surface roughness agent, 1-8% of a pore-forming agent and 0.5-10% of waterproof nano-powder. the preparation method comprises the steps that the polyethersulfone and the solvent are mixed according to the ratio, the mixture is stirred at 25-80 DEG C for 3-5 hours, the surface roughness agent, the pore-forming agent and the waterproof nano-powder are added according to the ratio, the mixture is continuously stirred for 8-15 hours, the stirred material is filtered and the filtered material is defoamed for 8-20 hours in vacuum to obtain a membrane casting solution; the membrane casting solution is casted on a supporting body and membrane scraping is performed by a scraper to obtain a primary membrane; the primary membrane is allowed to stand 15-180 seconds in the air to volatilize the solvent and form pores, and then the membrane sequentially enters a first coagulating bath and a second cleaning bath to be cleaned, and then drying is performed at 70-110 DEG C for 2-15 minutes to obtain the air microfiltration membrane with high-porosity, high hydrophobicity, high water resistance and large surface water contact angle.
Description
Technical field
The present invention relates to air micro-filtration membrane technical field, specifically a kind of disposable polyether sulfone air micro-filtration membrane and preparation method thereof.
Background technology
In the market for airfiltering material, as cellulose acetate membrane, the molten spray fiber membrane of polypropylene, nylon membrane, nucleopore membranes all exist different shortcomings: cellulose acetate membrane, raw material refines from Cotton Gossypii, intensity difference, preferably efflorescence, and easily decomposed by many microbial attacks, when kind and the substituted chemical group difference of microorganism, the degree that film properties is destroyed also differs；Polypropylene screen is owing to using the melt-blown fiber elongation method of high temperature to make, and its film surface is made up of many exposed long fibres, its acid-fast alkali-proof, intensity, but fiber is easy to fall off, and the membrane aperture of production is the biggest, is difficult to accomplish the film of 0.2～1.2 μm；Nylon membrane, the film of existing market is used mostly nylon66 fiber, and intensity is high, but there is also alkaline-resisting acid nonfast characteristic, and itself has hygroscopicity, and along with hygroscopic increase, air flux reduces, and membrane aperture easily changes；Nucleopore membranes has another name called porous alumina membrane, it it is the novel microporous filter membrane of one grown up the external seventies, the thermal neutron in nuclear reactor is utilized to make uranium-235 fission, the fragment that fission produces penetrates organic high score plastic sheeting, the path of fission fragment process stays a narrow irradiation damage passage, after this passage is oxidized, with suitable chemistry etches, passage on thin film can be become cylindric micropore, control radiation parameter and the etching condition of nuclear reactor, different hole density and the nucleopore membranes in aperture can be obtained, but the processing technology of nucleopore membranes is complex, the price of film is high, application is restricted.
Polyether sulfone (Polyethersulfone is called for short PES) is that ICI company of Britain is at exploitation in 1972 a kind of special engineering plastics of viable commercial product, owing to PES vitrification point is high, thing, change function admirable, abroad it is used for manufacturing NF membrane, ultrafilter membrane and micro-filtration membrane, also has hemodialysis filter etc., for airfiltering fewer, the film produced with it has intensity height, good filtration effect, the flow velocity advantage such as soon.
Traditional disposable polyether sulfone air film by percentage to the quality, is made up of following raw material: membrane material: PES, 10～35%；Solvent: dimethylformamide, 30～75%；Dissolution agent: sodium chloride, 0～10% and gas evaporation agent: calcium carbonate, 20～60%.Its preparation technology is: membrane material, solvent, dissolution agent and gas evaporation agent are put into container, stirs 0.5～6h and make fully to dissolve in 25～85 DEG C of temperature ranges, through filter membrane deaeration, places ripening, prepares PES casting solution；Being poured on by casting solution on glass plate or other supporter, use scraper knifing, the gap of scraper is 0.03～0.18mm, the operation temperature 20 of knifing～45 DEG C, relative humidity 50～90%；The first stage of inversion of phases is entered, primary membrane evaporation in 20～150 seconds, precipitation, preliminary gel in atmosphere from knifing；After pore-forming film forming, entering first coagulating bath, coagulation bath temperature controls at 15～45 DEG C, keep 3～20min, first coagulating bath composition includes that water and hydrochloric acid (0～12%), the hydrochloric acid in first coagulating bath produce carbon dioxide with the calcium carbonate reaction in film, forms pore；Second step enters in the second water-bath and is carried out, and the second water-bath is purified water, and temperature is 20～90 DEG C, keeps 10～60min, dries in the temperature of 30～80 DEG C.The shortcoming of technique made above is: owing to using gas to force hole forming method in above-mentioned formula, having the shortcoming that percent opening is low, flow is low, filter effect is low, the hydrochloric acid also used in preparation process has no small harm to environment, soil, subsoil water.
Summary of the invention
It is an object of the invention to provide a kind of percent opening height high, hydrophobic, the height that blocks water, disposable polyether sulfone air micro-filtration membrane that surface water contact angle is big and preparation method thereof.
For achieving the above object, the present invention provides following technical scheme:
Disposable polyether sulfone air micro-filtration membrane, by percentage to the quality, is made up of following raw material: polyether sulfone 9～15%, solvent 57～87.5%, rough surface agent 1～10%, pore former 1～8% and waterproof nano powder 0.5～10%.
As the further scheme of the present invention: described polyether sulfone is PES-3000p, molecular weight is 2 × 104～5 × 105。
As the further scheme of the present invention: described solvent is dimethyl acetylamide, dimethylformamide or METHYLPYRROLIDONE.
As the further scheme of the present invention: described pore former is acetone, dehydrated alcohol, ethylene glycol or water.
As the further scheme of the present invention: described rough surface agent is silicon dioxide.
As the further scheme of the present invention: described waterproof nano powder is polytetrafluorethylenano nano powder.
The preparation method of described disposable polyether sulfone air micro-filtration membrane, concretely comprises the following steps:
The first step: join in blender by polyether sulfone and solvent in proportion, stirs 3～5h at 25～80 DEG C, is proportionally added into rough surface agent, pore former and waterproof nano powder, is further continued for stirring 8～15h, crosses 200 mesh filter screens, and vacuum defoamation 8～20h obtains casting solution；
Second step: the casting solution first step obtained casts on supporter, obtains primary membrane with scraper knifing, and wherein, the clearance height of scraper is 0.15～0.35mm, and scraping film temperature is 25～40 DEG C, relative humidity 40～80%；
3rd step: the primary membrane obtained by second step stops 15～180s in atmosphere and volatilized by solvent pore-forming, then sequentially enter in the first coagulating bath, the second cleaner bath and be carried out, described first coagulating bath has the apyrogeneity purified water of 20～40 DEG C, second cleaner bath has the apyrogeneity purified water of 25～50 DEG C, the described primary membrane time of staying in the first coagulating bath, the second cleaner bath is respectively 5～20min, 5～20min, at 70～110 DEG C, the primary membrane after the second cleaner bath is cleaned is dried 2～15min and obtains air micro-filtration membrane.
As the further scheme of the present invention: the average pore size of described air micro-filtration membrane is 0.05～1.2 μm.
Compared with prior art, the invention has the beneficial effects as follows:
The present invention is that a face of inversion of phases anisotropic membrane, i.e. film is greater than or is less than the hole of another side, therefore claims anisotropic membrane.Owing to the composition of casting solution is organic polymer PES and various solvent composition, so organic polymer is to be linked by the least molecule monomer, macromolecule casting solution makes macromolecule by all means, and from homogeneous phase solution, precipitating is out, i.e. it is divided into two-phase: a phase is that macromolecule richness eventually forms polymeric membrane mutually, another phase is that macromolecule is stingy, finally become the hole in film, the rough surface agent added makes film surface produce the concavo-convex structure of nanoscale (similar Folium Nelumbinis structure), the film surface hydrophobicity angle produced is higher, the interpolation of waterproof nano powder improves the water preventing ability of film, in identical casting solution composition, only need to change the temperature of environment, humidity, evaporation time, just can change evaporation rate constant, thus obtain the film of different pore size.
The present invention uses high-quality plastics polyether sulfone, by liquid liquid phase separation method, technique is simple, product cost is low, meet Consumption of China situation, the product produced has percent opening high (60～85%), flow high (making filter with the film of Φ 25, the gas flow under 10kPa pressure is more than 2800-3200ml), filter effect high (the microgranule rejection rate of right >=0.3 μm is more than 95%), has i.e. possessed the performance of three-hypers.
Detailed description of the invention
Below in conjunction with the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art are obtained under not making creative work premise, broadly fall into the scope of protection of the invention.
Embodiment 1
In the embodiment of the present invention, disposable polyether sulfone air micro-filtration membrane, by percentage to the quality, it is made up of following raw material: polyether sulfone 9%, METHYLPYRROLIDONE 85%, rough surface agent 2%, acetone 2% and waterproof nano powder 2%.
The preparation method of described disposable polyether sulfone air micro-filtration membrane, concretely comprises the following steps:
The first step: in proportion polyether sulfone and METHYLPYRROLIDONE are joined in blender, stir 3h at 60 DEG C, be proportionally added into rough surface agent, acetone and waterproof nano powder, be further continued for stirring 10h, crossing 200 mesh filter screens, under the conditions of 20 DEG C, vacuum defoamation 10h obtains casting solution；
Second step: the casting solution first step obtained casts on supporter, supporter is glass plate, obtains primary membrane with scraper knifing, and wherein, the clearance height of scraper is 0.2mm, and scraping film temperature is 30 DEG C, relative humidity 70%；
3rd step: the primary membrane obtained by second step stops 70s in atmosphere and volatilized by METHYLPYRROLIDONE pore-forming, then sequentially enter in the first coagulating bath, the second cleaner bath and be carried out, described first coagulating bath has the apyrogeneity purified water of 25 DEG C, second cleaner bath has the apyrogeneity purified water of 25 DEG C, the described primary membrane time of staying in the first coagulating bath, the second cleaner bath is respectively 5min, 5min, at 70 DEG C, the primary membrane after the second cleaner bath is cleaned is dried 4min and obtains air micro-filtration membrane.
Embodiment 2
In the embodiment of the present invention, disposable polyether sulfone air micro-filtration membrane, by percentage to the quality, it is made up of following raw material: polyether sulfone 10%, dimethylformamide 81%, rough surface agent 7.5%, dehydrated alcohol 1% and waterproof nano powder 0.5%.
The preparation method of described disposable polyether sulfone air micro-filtration membrane, concretely comprises the following steps:
The first step: in proportion polyether sulfone and dimethylformamide are joined in blender, stir 5h at 80 DEG C, be proportionally added into rough surface agent, dehydrated alcohol and waterproof nano powder, be further continued for stirring 8h, crossing 200 mesh filter screens, at a temperature of 20 DEG C, vacuum defoamation 8h obtains casting solution；
Second step: the casting solution first step obtained casts on supporter, supporter is glass plate, obtains primary membrane with scraper knifing, and wherein, the clearance height of scraper is 0.15mm, and scraping film temperature is 40 DEG C, relative humidity 80%；
3rd step: the primary membrane obtained by second step stops 180s in atmosphere and volatilized by dimethylformamide pore-forming, then sequentially enter in the first coagulating bath, the second cleaner bath and be carried out, described first coagulating bath has the apyrogeneity purified water of 40 DEG C, second cleaner bath has the apyrogeneity purified water of 50 DEG C, the described primary membrane time of staying in the first coagulating bath, the second cleaner bath is respectively 20min, 20min, at 70 DEG C, the primary membrane after the second cleaner bath is cleaned is dried 15min and obtains air micro-filtration membrane.
Embodiment 3
In the embodiment of the present invention, disposable polyether sulfone air micro-filtration membrane, by percentage to the quality, it is made up of following raw material: polyether sulfone 12%, METHYLPYRROLIDONE 83%, rough surface agent 2%, acetone 1% and waterproof nano powder 2%.
The preparation method of described disposable polyether sulfone air micro-filtration membrane, concretely comprises the following steps:
The first step: in proportion polyether sulfone and METHYLPYRROLIDONE are joined in blender, stir 3h at 60 DEG C, be proportionally added into rough surface agent, acetone and waterproof nano powder, be further continued for stirring 10h, crossing 200 mesh filter screens, at a temperature of 20 DEG C, vacuum defoamation 10h obtains casting solution；
Second step: the casting solution first step obtained casts on supporter, supporter is glass plate, obtains primary membrane with scraper knifing, and wherein, the clearance height of scraper is 0.25mm, and scraping film temperature is 28 DEG C, relative humidity 60%；
3rd step: the primary membrane obtained by second step stops 50s in atmosphere and volatilized by METHYLPYRROLIDONE pore-forming, then sequentially enter in the first coagulating bath, the second cleaner bath and be carried out, described first coagulating bath has the apyrogeneity purified water of 25 DEG C, second cleaner bath has the apyrogeneity purified water of 30 DEG C, the described primary membrane time of staying in the first coagulating bath, the second cleaner bath is respectively 6min, 8min, at 80 DEG C, the primary membrane after the second cleaner bath is cleaned is dried 5min and obtains air micro-filtration membrane.
Embodiment 4
In the embodiment of the present invention, disposable polyether sulfone air micro-filtration membrane, by percentage to the quality, it is made up of following raw material: polyether sulfone 12%, dimethyl acetylamide 83%, rough surface agent 1%, acetone 2% and waterproof nano powder 2%.
The preparation method of described disposable polyether sulfone air micro-filtration membrane, concretely comprises the following steps:
The first step: in proportion polyether sulfone and dimethyl acetylamide are joined in blender, stir 3h at 80 DEG C, be proportionally added into rough surface agent, acetone and waterproof nano powder, be further continued for stirring 15h, crossing 200 mesh filter screens, at a temperature of 25 DEG C, vacuum defoamation 15h obtains casting solution；
Second step: the casting solution first step obtained casts on supporter, supporter is glass plate, obtains primary membrane with scraper knifing, and wherein, the clearance height of scraper is 0.30mm, and scraping film temperature is 25 DEG C, relative humidity 55%；
3rd step: the primary membrane obtained by second step stops 30s in atmosphere and volatilized by dimethyl acetylamide pore-forming, then sequentially enter in the first coagulating bath, the second cleaner bath and be carried out, described first coagulating bath has the apyrogeneity purified water of 20 DEG C, second cleaner bath has the apyrogeneity purified water of 40 DEG C, the described primary membrane time of staying in the first coagulating bath, the second cleaner bath is respectively 10min, 10min, at 90 DEG C, the primary membrane after the second cleaner bath is cleaned is dried 5min and obtains air micro-filtration membrane.
Embodiment 5
In the embodiment of the present invention, disposable polyether sulfone air micro-filtration membrane, by percentage to the quality, it is made up of following raw material: polyether sulfone 13%, dimethylformamide 65%, rough surface agent 8%, ethylene glycol 6% and waterproof nano powder 8%.
The preparation method of described disposable polyether sulfone air micro-filtration membrane, concretely comprises the following steps:
The first step: in proportion polyether sulfone and dimethylformamide are joined in blender, stir 5h at 25 DEG C, be proportionally added into rough surface agent, ethylene glycol and waterproof nano powder, be further continued for stirring 8h, crossing 200 mesh filter screens, at a temperature of 20 DEG C, vacuum defoamation 8h obtains casting solution；
Second step: the casting solution first step obtained casts on supporter, supporter is glass plate, obtains primary membrane with scraper knifing, and wherein, the clearance height of scraper is 0.15mm, and scraping film temperature is 40 DEG C, relative humidity 80%；
3rd step: the primary membrane obtained by second step stops 180s in atmosphere and volatilized by dimethylformamide pore-forming, then sequentially enter in the first coagulating bath, the second cleaner bath and be carried out, described first coagulating bath has the apyrogeneity purified water of 40 DEG C, second cleaner bath has the apyrogeneity purified water of 50 DEG C, the described primary membrane time of staying in the first coagulating bath, the second cleaner bath is respectively 5min, 5min, at 110 DEG C, the primary membrane after the second cleaner bath is cleaned is dried 2min and obtains air micro-filtration membrane.
Embodiment 6
In the embodiment of the present invention, disposable polyether sulfone air micro-filtration membrane, by percentage to the quality, it is made up of following raw material: polyether sulfone 15%, dimethylformamide 80%, rough surface agent 1%, acetone 2% and waterproof nano powder 2%.
The preparation method of described disposable polyether sulfone air micro-filtration membrane, concretely comprises the following steps:
The first step: in proportion polyether sulfone and dimethylformamide are joined in blender, stir 3h at 25 DEG C, be proportionally added into rough surface agent, acetone and waterproof nano powder, be further continued for stirring 15h, crossing 200 mesh filter screens, at a temperature of 25 DEG C, vacuum defoamation 20h obtains casting solution；
Second step: the casting solution first step obtained casts on supporter, supporter is glass plate, obtains primary membrane with scraper knifing, and wherein, the clearance height of scraper is 0.35mm, and scraping film temperature is 25 DEG C, relative humidity 40%；
3rd step: the primary membrane obtained by second step stops 15s in atmosphere and volatilized by dimethylformamide pore-forming, then sequentially enter in the first coagulating bath, the second cleaner bath and be carried out, described first coagulating bath has the apyrogeneity purified water of 20 DEG C, second cleaner bath has the apyrogeneity purified water of 40 DEG C, the described primary membrane time of staying in the first coagulating bath, the second cleaner bath is respectively 10min, 10min, at 110 DEG C, the primary membrane after the second cleaner bath is cleaned is dried 5min and obtains air micro-filtration membrane.The performance test results of the air micro-filtration membrane of foregoing invention embodiment gained is as shown in table 1 below:
The properties of sample of table 1 embodiment 1-6
The disposable polyether sulfone air micro-filtration membrane of the present invention is mainly used in microgranule and the antibacterial that medical and clinical transfusion device air intake is crossed in air filtering.First air micro-filtration membrane is made the shape of regulation, makes air filter.Air filter divides upper shell, lower house, and housing is to be obtained by medical high polymer plastic warp injection mo(u)lding, then puts filter membrane of the present invention, filtration in the middle of it.Carry out integrally welded with ultrasound wave after upper shell, lower house and the assembling of air micro-filtration membrane, one end air inlet, air is after air micro-filtration membrane, microgranule therein and antibacterial can be retained by air micro-filtration membrane and filter, then from the gas that other end output is relatively clean, transfusion is made to reach safe and effective purpose clinically.
It is obvious to a person skilled in the art that the invention is not restricted to the details of above-mentioned one exemplary embodiment, and without departing from the spirit or essential characteristics of the present invention, it is possible to realize the present invention in other specific forms.Therefore, no matter from the point of view of which point, embodiment all should be regarded as exemplary, and be nonrestrictive, the scope of the present invention is limited by claims rather than described above, it is intended that all changes fallen in the implication of equivalency and scope of claim included in the present invention.
In addition, it is to be understood that, although this specification is been described by according to embodiment, but the most each embodiment only comprises an independent technical scheme, this narrating mode of description is only for clarity sake, description should can also be formed, through appropriately combined, other embodiments that it will be appreciated by those skilled in the art that as an entirety, the technical scheme in each embodiment by those skilled in the art.
Claims (8)
1. disposable polyether sulfone air micro-filtration membrane, it is characterised in that by percentage to the quality, by following raw material system
Become: polyether sulfone 9～15%, solvent 57～87.5%, rough surface agent 1～10%, pore former 1～8% and waterproof
Nano powder 0.5～10%.
Disposable polyether sulfone air micro-filtration membrane the most according to claim 1, it is characterised in that described is poly-
Ether sulfone is PES-3000p, and molecular weight is 2 × 104～5 × 105。
Disposable polyether sulfone air micro-filtration membrane the most according to claim 1, it is characterised in that described is molten
Agent is dimethyl acetylamide, dimethylformamide or METHYLPYRROLIDONE.
Disposable polyether sulfone air micro-filtration membrane the most according to claim 1, it is characterised in that described one-tenth
Hole agent is acetone, dehydrated alcohol, ethylene glycol or water.
Disposable polyether sulfone air micro-filtration membrane the most according to claim 1, it is characterised in that described table
Face roughening agent is silicon dioxide.
Disposable polyether sulfone air micro-filtration membrane the most according to claim 1, it is characterised in that described is anti-
Water nano powder is polytetrafluorethylenano nano powder.
7. a preparation method for the disposable polyether sulfone air micro-filtration membrane as described in as arbitrary in claim 1～6,
It is characterized in that, concretely comprise the following steps:
The first step: join in blender by polyether sulfone and solvent in proportion, stirs 3～5h at 25～80 DEG C,
It is proportionally added into rough surface agent, pore former and waterproof nano powder, is further continued for stirring 8～15h, cross 200 mesh
Filter screen, vacuum defoamation 8～20h obtains casting solution；
Second step: the casting solution first step obtained casts on supporter, obtains primary membrane with scraper knifing,
Wherein, the clearance height of scraper is 0.15～0.35mm, and scraping film temperature is 25～40 DEG C, relative humidity 40～
80%；
3rd step: the primary membrane obtained by second step stops 15～180s in atmosphere and volatilized by solvent pore-forming,
Then sequentially enter in the first coagulating bath, the second cleaner bath and be carried out, described first coagulating bath has 20～
The apyrogeneity purified water of 40 DEG C, has the apyrogeneity purified water of 25～50 DEG C in the second cleaner bath, described nascent
The film time of staying in the first coagulating bath, the second cleaner bath is respectively 5～20min, 5～20min, will be through
Cross the primary membrane after the second cleaner bath is cleaned and obtain air micro-filtration membrane 70～110 DEG C of drying 2～15min.
The preparation method of disposable polyether sulfone air micro-filtration membrane the most according to claim 7, it is characterised in that
The average pore size of described air micro-filtration membrane is 0.05～1.2 μm.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110559882A (en) * | 2019-09-02 | 2019-12-13 | 吉林大学 | Super-hydrophobic/super-oleophylic polyether sulfone oil-water separation membrane with multi-layer structure and preparation method thereof |
| CN110898690A (en) * | 2019-12-03 | 2020-03-24 | 四川大学 | Polymer fiber membrane with self-cleaning effect, and preparation method and application thereof |
| CN111974226A (en) * | 2019-05-24 | 2020-11-24 | 山东振富医疗器械有限公司 | Preparation method of disposable polyether sulfone liquid medicine film |
| CN114670359A (en) * | 2022-03-30 | 2022-06-28 | 张水龙 | Preparation method of novel nanofiltration membrane |
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| CN101695637A (en) * | 2009-10-27 | 2010-04-21 | 上海振浦医疗设备有限公司 | Disposable polyether sulfone micro-filtration membrane and preparation method thereof |
| CN103495352A (en) * | 2013-09-24 | 2014-01-08 | 天津工业大学 | Preparation method of modified polyether sulfuryl hydrophobic film for gas-liquid film contactor |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101695637A (en) * | 2009-10-27 | 2010-04-21 | 上海振浦医疗设备有限公司 | Disposable polyether sulfone micro-filtration membrane and preparation method thereof |
| CN103495352A (en) * | 2013-09-24 | 2014-01-08 | 天津工业大学 | Preparation method of modified polyether sulfuryl hydrophobic film for gas-liquid film contactor |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111974226A (en) * | 2019-05-24 | 2020-11-24 | 山东振富医疗器械有限公司 | Preparation method of disposable polyether sulfone liquid medicine film |
| CN110559882A (en) * | 2019-09-02 | 2019-12-13 | 吉林大学 | Super-hydrophobic/super-oleophylic polyether sulfone oil-water separation membrane with multi-layer structure and preparation method thereof |
| CN110559882B (en) * | 2019-09-02 | 2021-05-25 | 吉林大学 | Super-hydrophobic/super-oleophylic polyether sulfone oil-water separation membrane with multi-layer structure and preparation method thereof |
| CN110898690A (en) * | 2019-12-03 | 2020-03-24 | 四川大学 | Polymer fiber membrane with self-cleaning effect, and preparation method and application thereof |
| CN114670359A (en) * | 2022-03-30 | 2022-06-28 | 张水龙 | Preparation method of novel nanofiltration membrane |
| CN114670359B (en) * | 2022-03-30 | 2024-01-26 | 碧菲分离膜（大连）有限公司 | Preparation method of novel nanofiltration membrane |
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