CN104492285A - Anti-pollution and high-flux ultrafiltration membrane, preparation method thereof and membrane casting solution - Google Patents
Anti-pollution and high-flux ultrafiltration membrane, preparation method thereof and membrane casting solution Download PDFInfo
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Abstract
The invention relates to a membrane casting solution for preparing an anti-pollution and high-flux ultrafiltration membrane. The membrane casting solution is prepared from the following components by weight: 16-30% of polyether sulfone, 1-6% of a mutual matching pore forming agent, 0.5-5% of an organic acid additive and 60-80% of a solvent. The invention also relates to the anti-pollution and high-flux ultrafiltration membrane and a preparation method thereof. The tubular or flat ultrafiltration membrane prepared from the membrane casting solution has the characteristics of uniform pore size distribution, high membrane flux, good stability, strong pollution resistance, high flux recovery rate after backwashing, wide range of application, good mechanical strength and chemical resistance, and is applicable to high viscosity and high solid content system. Compared with other preparation method, the preparation method has the characteristics of simple process, controllable membrane pore size, low cost and convenience for industrialized production.
Description
Technical field
The invention belongs to polymeric membrane for separation technical field, particularly a kind of antipollution, high-flux ultra-filtration membrane and preparation method thereof and casting solution used.
Background technology
Super/micro-filter technology as a kind of take pressure as one of membrane separation technique of motive force, namely under pressure, Small molecular solute and solvent is made to pass the special film of certain pore size, and make large molecule solute can not be through, stay one side of film, thus make macromolecular substances obtain the purifying of part, have that normal-temperature operation, process are low without phase transformation, energy consumption, separative efficiency advantages of higher, be widely used in industries such as drink water purifying, petrochemical industry, biological medicine, food, metallurgy at present.
Polyether sulfone is a kind of thermoplastic macromolecule material of excellent combination property, its outstanding chemical stability, heat endurance, excellent mechanical strength, dimensional stability and resistance tocrocking, make PES be a kind of membrane material of excellence, be widely used in the preparation of perforated membrane.
In recent years PES film membrane formation mechanism and membrance casting condition etc. are conducted in-depth research, obtain the film of many different structures.But in actual use procedure, due to film longtime running meeting compacting under a certain pressure, cause the decline of membrane flux, and the flux recovery rate of certain condition backwash caudacoria is low, causes life cycle short, film is changed frequent.PES milipore filter flux is in the market low and decay is fast, easily pollutes, significantly limit the commercial Application of PES film.
Summary of the invention
The invention solves that PES milipore filter flux in prior art is low and decay is fast, easily pollute, problem, be to provide a kind of flux high and good stability, flux recovery rate is high after backwash antipollution, high-flux ultra-filtration membrane and preparation method thereof and casting solution used.
Concrete technical scheme of the present invention is as follows:
For the preparation of a casting solution for antipollution, high-flux ultra-filtration membrane, formulated by mass percentage by following component:
Polyether sulfone 16-30%
Interworking pore-foaming agent 1 ~ 6%
Organic additive 0.5 ~ 5%
Solvent 60 ~ 80%.
Described interworking pore-foaming agent is that 2 ~ 5:1 mixes by polyvinylpyrrolidone and alcohol according to mass ratio, and described alcohol is selected from one or more arbitrary proportions mixing in polyethylene glycol, ethylene glycol, glycerine, isopropyl alcohol, n-butanol; Described polyethylene glycol is preferably the polyethylene glycol that molecular weight is 200,400,600.Above-mentioned interworking pore-foaming agent is adopted to be conducive to forming the finger-like pore that penetrability is good, be evenly distributed.
Described organic additive is selected from one or more arbitrary proportions mixing in citric acid, acetic acid, malic acid, oxalic acid, salicylic acid, maleic acid, fumaric acid.The crystal habit of finger-like hole wall can be regulated and controled by adding organic acid, and the surface apertures of film.
Described solvent is selected from the one in DMF, DMA, 1-METHYLPYRROLIDONE.
A kind of antipollution, high-flux ultra-filtration membrane, adopt the above-mentioned casting solution stated to be prepared from.
Adopt above-mentioned casting solution to prepare the preparation method of antipollution, high-flux ultra-filtration membrane, comprise the steps:
(1) after interworking pore-foaming agent, organic additive being mixed with solvent, at 20 ~ 40 DEG C, ultrasonic wave disperses 30-60min, obtains solution;
(2) polyether sulfone is joined in solution, stirring and dissolving, obtain casting solution;
(3) casting solution is carried out vacuum defoamation, be placed in together with non-woven fabrics on integrated tubular film applicator or dull and stereotyped coating machine after leaving standstill 6-24h, make tubular membrane or Flat Membrane;
(4) tubular membrane made in step (3) or Flat Membrane are placed in air, treat that solvent volatilizees, in rear rapid immersion coagulating bath, phase inversion forms tubular ultra-filtration membrane or flat plate ultrafiltration membrane.
In order to obtain uniform and stable casting solution, in step (2), polyether sulfone is joined in solution, 8h is stirred with the mixing speed of 200-400r/min in 60-80 DEG C, then be warming up to 80-90 DEG C and stir 2-5h, then cool to 70-80 DEG C of stirring 6-10 hour, obtain casting solution.
In step (3), the vacuum defoamation time is unsuitable oversize, and avoid extracting additive alcohol and solvent out, destroy the composition of casting solution, the preferred vacuum defoamation time is 30-60 minute, and vacuum is 0.1MPa.
In step (4), tubular membrane or Flat Membrane are placed in the air 10 ~ 30 seconds of 25-35 DEG C, relative air humidity is 30 ~ 50%; Under this environmental condition, solvent is volatilized, the cortex being conducive to regulating and controlling film is formed, and optimizes flux and the rejection of film.
In step (4), described coagulating bath is selected from the one in deionized water, alcoholic solution; Described alcohol is selected from the one in ethanol, propyl alcohol, isopropyl alcohol, n-butanol, and the mass concentration of alcoholic solution is 10 ~ 40%; The temperature of coagulating bath is 20 ~ 35 DEG C, and soak time is 1 ~ 3 day; The solvent in prepared film is fully cemented out.
Tubular ultra-filtration membrane of the present invention does supporter with non-woven fabrics stay pipe, the diffusion barrier of its surface coating 0.1 ~ 0.25um; Flat plate ultrafiltration membrane of the present invention take polyester non-woven fabric as supporter, the diffusion barrier of surface coating 0.1 ~ 0.25 μm.
Integrated tubular film applicator of the present invention and dull and stereotyped automatic coating machine are existing.
The tubular type adopting casting solution of the present invention to prepare or flat plate ultrafiltration membrane have even aperture distribution, membrane flux is high and good stability, resistance tocrocking are strong, high, the applied range of flux recovery rate after backwash, there is the features such as good mechanical strength and chemical resistance, be applicable to high viscosity, large arch dam system.The present invention, compared with other preparation methods, has that preparation technology is simple, membrane aperture is controlled, cost is low, be convenient to the feature of suitability for industrialized production.
Accompanying drawing explanation
Fig. 1 is the Electronic Speculum sectional drawing (low power) of the poly (ether-sulfone) ultrafiltration membrane of German Berghof company;
Fig. 2 is the Electronic Speculum sectional drawing (finger-like hole wall high power figure) of the poly (ether-sulfone) ultrafiltration membrane of German Berghof company;
Fig. 3 is the Electronic Speculum sectional drawing (low power) of the poly (ether-sulfone) ultrafiltration membrane that the embodiment of the present invention 4 obtains;
Fig. 4 is the Electronic Speculum sectional drawing (finger-like hole wall high power figure) of the poly (ether-sulfone) ultrafiltration membrane that the embodiment of the present invention 4 obtains;
Fig. 5 is the flux decline schematic diagram of the obtained poly (ether-sulfone) ultrafiltration membrane of the poly (ether-sulfone) ultrafiltration membrane of German Berghof company and the embodiment of the present invention 4;
Fig. 6 is contact angle (contact angle the is 56 °) picture on the poly (ether-sulfone) ultrafiltration membrane surface that the embodiment of the present invention 4 obtains.
Detailed description of the invention
The present invention is further illustrated below in conjunction with specific embodiment.
In the present invention, the detection method of film pure water flux is:
Electrical conductivity is less than 10 μm of cm
-1, turbidity be less than 0.1NTU pure water inject head tank, water temperature remains on 25 DEG C.Start water pump, make pure water by tubular membrane, regulate transmembrane pressure 0.1MPa, stablize the unit interval of tubular membrane of determinator after 15min, the pure water flux of unit are.As follows by formulae discovery:
F=Q/A×1000
In formula:
The pure water flux of F---film, L/m
2h
The pure water transit dose of the film of Q---unit interval, m
3/ h
A---effective film area, m
3.
Number described in embodiment is weight portion.
embodiment 1
By 80 parts of 1-METHYLPYRROLIDONEs, 1 part of interworking pore-foaming agent (mass ratio of polyvinylpyrrolidone and ethylene glycol is 3:1), 3 parts of citric acids are placed in there-necked flask ultrasonic wave process 40 minutes at 30 DEG C; Obtain solution.16 parts of polyether sulfones are joined in solution, stirs 8h prior to 70 DEG C with the mixing speed of 200-400r/min, be then warming up to 85 DEG C and stir 2h, then cool to 70 DEG C of stirrings 6 hours, obtain casting solution.Be carry out vacuum defoamation 35 minutes under the vacuum condition of 0.1MPa in vacuum by casting solution, 24 hours are left standstill after deaeration, then be placed in together with non-woven fabrics on integrated tubular film applicator, at inner surface coating while non-woven fabrics is rolled into tubulose, the overlapping junction of its non-woven fabrics, through ultrasonic bonding, obtains tubular membrane; Subsequently tubular membrane is left standstill 10 ~ 20 seconds in the air (relative air humidity is 30 ~ 50%) of 25-35 DEG C, after solvent volatilization, immerse rapidly temperature is soak 3 days in the pure water coagulating bath of 25 DEG C, and phase inversion forms tubular ultra-filtration membrane finished product.Run under routine, about follow-on test two weeks, obtain the flux decline situation of film; And pass through the contact angle of contact angle tester test membrane.
Conveniently film properties evaluation method, pressure be 0.1MPa, at temperature is 25 DEG C, the initial pure water flux of this film is 915L/m
2h, the attenuation rate running two weeks caudacoria is 29%, and the contact angle of film is 58 °.
embodiment 2
By 70 parts of 1-METHYLPYRROLIDONEs, 6 parts of interworking pore-foaming agents (mass ratio of polyvinylpyrrolidone and ethylene glycol is 5:1), 5 parts of citric acids are placed in there-necked flask ultrasonic wave process 40 minutes at 30 DEG C; Obtain solution.19 parts of polyether sulfones are joined in solution, stirs 8h prior to 70 DEG C with the mixing speed of 200-400r/min, be then warming up to 85 DEG C and stir 2h, then cool to 70 DEG C of stirrings 6 hours, obtain casting solution.Be carry out vacuum defoamation 60 minutes under the vacuum condition of 0.1MPa in vacuum by casting solution, 24 hours are left standstill after deaeration, then be placed in together with non-woven fabrics on integrated tubular film applicator, at inner surface coating while non-woven fabrics is rolled into tubulose, the overlapping junction of its non-woven fabrics, through ultrasonic bonding, obtains tubular membrane; Subsequently tubular membrane is left standstill 10 ~ 15 seconds in the air (relative air humidity is 30 ~ 50%) of 25-35 DEG C, after solvent volatilization, immerse rapidly temperature be the mass concentration of 25 DEG C be 30% ethanolic solution coagulating bath inversion of phases film forming, to be immersed in pure water 2 days afterwards, to remove remaining solvent and form tubular ultra-filtration membrane finished product.Run under routine, about follow-on test two weeks, obtain the flux decline situation of film; And pass through the contact angle of contact angle tester test membrane.
Conveniently film properties evaluation method, pressure be 0.1MPa, at temperature is 25 DEG C, the initial pure water flux of this film is 965L/m
2h, after running two weeks, the attenuation rate of film is 30%, and the contact angle test of film is 54 °.
embodiment 3
By 75 parts of DMAs, (mass ratio of polyvinylpyrrolidone and glycerine is 3 to 4 parts of interworking pore-foaming agents; 1), 5 parts of citric acids are placed in there-necked flask ultrasonic wave process 40 minutes at 30 DEG C; Obtain solution.16 parts of polyether sulfones are joined in solution, stirs 8h prior to 70 DEG C with the mixing speed of 200-400r/min, be then warming up to 85 DEG C and stir 2h, then cool to 70 DEG C of stirrings 6 hours, obtain casting solution.Be carry out vacuum defoamation 60 minutes under the vacuum condition of 0.1MPa in vacuum by casting solution, 24 hours are left standstill after deaeration, then be placed in together with non-woven fabrics on integrated tubular film applicator, at inner surface coating while non-woven fabrics is rolled into tubulose, the overlapping junction of its non-woven fabrics, through ultrasonic bonding, obtains tubular membrane; Subsequently tubular membrane is left standstill 10 ~ 20 seconds in the air (relative air humidity is 30 ~ 50%) of 25-35 DEG C, after solvent volatilization, immerse rapidly temperature be the mass concentration of 25 DEG C be 20% ethanolic solution coagulating bath inversion of phases film forming, to be immersed in pure water 2 days afterwards, to remove remaining solvent and form tubular ultra-filtration membrane finished product.Run under routine, about follow-on test two weeks, obtain the flux decline situation of film, and pass through the contact angle of contact angle tester test membrane.
Conveniently film properties evaluation method, pressure be 0.1MPa, at temperature is 25 DEG C, the initial pure water flux of this film is 855L/m
2h, after running two weeks, the attenuation rate of film is 27%, and the contact angle test of film is 56 °.
embodiment 4
By 70 parts of 1-METHYLPYRROLIDONEs, 6 parts of interworking pore-foaming agents (polyvinylpyrrolidone 4 parts, PEG400 2 parts), 4 parts of fumaric acid are placed in there-necked flask ultrasonic wave process 40 minutes at 30 DEG C; Obtain solution.20 parts of polyether sulfones are joined in solution, stirs 8h prior to 70 DEG C with the mixing speed of 200-400r/min, be then warming up to 85 DEG C and stir 2h, then cool to 70 DEG C of stirrings 6 hours, obtain casting solution.Be carry out vacuum defoamation 40 minutes under the vacuum condition of 0.1MPa in vacuum by casting solution, 24 hours are left standstill after deaeration, then be placed in together with non-woven fabrics on integrated tubular film applicator, at inner surface coating while non-woven fabrics is rolled into tubulose, the overlapping junction of its non-woven fabrics, through ultrasonic bonding, obtains tubular membrane; Subsequently tubular membrane is left standstill 10 ~ 15 seconds in the air (relative air humidity is 30 ~ 50%) of 25-35 DEG C, after solvent volatilization, immerse rapidly temperature be the mass concentration of 25 DEG C be 30% ethanolic solution coagulating bath inversion of phases film forming, to be immersed in pure water 2 days afterwards, to remove remaining solvent and form tubular ultra-filtration membrane finished product.Run under routine, about follow-on test two weeks, obtain the flux decline situation of film.Run under routine, about follow-on test two weeks, obtain the flux decline situation of film, and pass through the contact angle of contact angle tester test membrane.
Conveniently film properties evaluation method, pressure be 0.1MPa, at temperature is 25 DEG C, the initial pure water flux of this film is 785L/m
2h, the pure water flux of most telolemma is 535L/m
2h, flux decline 31%, the contact angle test of film is 56 °; Illustrate that the hydrophily of film is very high, substantially increase the contamination resistance of film.
embodiment 5
By 62 parts of DMFs, 4 parts of interworking pore-foaming agents (the mass ratio 2:1 of polyvinylpyrrolidone and ethylene glycol), 4 parts of fumaric acid are placed in there-necked flask ultrasonic wave process 30 minutes at 40 DEG C; Obtain solution.30 parts of polyether sulfones are joined in solution, stirs 8h prior to 70 DEG C with the mixing speed of 200-400r/min, be then warming up to 85 DEG C and stir 3h, then cool to 70 DEG C of stirrings 8 hours, obtain casting solution.Be carry out vacuum defoamation 35 minutes under the vacuum condition of 0.1MPa in vacuum by casting solution, leave standstill 12 hours after deaeration, be then placed in together with non-woven fabrics on dull and stereotyped coating machine, obtain Flat Membrane; Subsequently tubular membrane is left standstill 10 ~ 20 seconds in the air (relative air humidity is 30 ~ 50%) of 25-35 DEG C, after solvent volatilization, immerse rapidly temperature be the mass concentration of 25 DEG C be 20% ethanolic solution coagulating bath inversion of phases film forming, to be immersed in pure water 2 days afterwards, to remove remaining solvent and form tubular ultra-filtration membrane finished product.Run under routine, about follow-on test two weeks, obtain the flux decline situation of film, and pass through the contact angle of contact angle tester test membrane.
Conveniently film properties evaluation method, pressure be 0.1MPa, at temperature is 25 DEG C, the initial pure water flux of this film is 765L/m
2h, the attenuation rate after two weeks is 28%, and the contact angle of film is 55 °.
embodiment 6
By 80 parts of 1-METHYLPYRROLIDONEs, 3 parts of interworking pore-foaming agents (mass ratio of polyvinylpyrrolidone and isopropyl alcohol is 5:1), 1 part of malic acid is placed in there-necked flask ultrasonic wave process 30 minutes at 40 DEG C; Obtain solution.16 parts of polyether sulfones are joined in solution, stirs 8h prior to 70 DEG C with the mixing speed of 200-400r/min, be then warming up to 85 DEG C and stir 3h, then cool to 70 DEG C of stirrings 8 hours, obtain casting solution.Be carry out vacuum defoamation 30-40 minute under the vacuum condition of 0.1MPa in vacuum by casting solution, leave standstill 12 hours after deaeration, be then placed in together with non-woven fabrics on dull and stereotyped coating machine, obtain Flat Membrane; Subsequently tubular membrane is left standstill 10 ~ 20 seconds in the air (relative air humidity is 30 ~ 50%) of 25-35 DEG C, after solvent volatilization, immerse rapidly temperature be the mass concentration of 25 DEG C be 40% ethanolic solution coagulating bath inversion of phases film forming, to be immersed in pure water 2 days afterwards, to remove remaining solvent and form tubular ultra-filtration membrane finished product.Run under routine, about follow-on test two weeks, obtain the flux decline situation of film, and pass through the contact angle of contact angle tester test membrane.
Conveniently film properties evaluation method, pressure be 0.1MPa, at temperature is 25 DEG C, the initial pure water flux of this film is 980L/m
2h.The film pure water flux run after two weeks is 450L/m
2h, flux decline 45%, the contact angle of film is 58 °.
comparative example 1
By 81 parts of 1-METHYLPYRROLIDONEs, 3 parts of interworking pore-foaming agents (mass ratio of polyvinylpyrrolidone and isopropyl alcohol is 5:1), are placed in there-necked flask ultrasonic wave process 30 minutes at 40 DEG C; Obtain solution.16 parts of polyether sulfones are joined in solution, stirs 8h prior to 70 DEG C with the mixing speed of 200-400r/min, be then warming up to 85 DEG C and stir 3h, then cool to 70 DEG C of stirrings 8 hours, obtain casting solution.Be carry out vacuum defoamation 30-40 minute under the vacuum condition of 0.1MPa in vacuum by casting solution, leave standstill 12 hours after deaeration, be then placed in together with non-woven fabrics on dull and stereotyped coating machine, obtain Flat Membrane; Subsequently tubular membrane is left standstill 10 ~ 20 seconds in the air (relative air humidity is 30 ~ 50%) of 25-35 DEG C, after solvent volatilization, immerse rapidly temperature be the mass concentration of 25 DEG C be 20% ethanolic solution coagulating bath inversion of phases film forming, to be immersed in pure water 2 days afterwards, to remove remaining solvent and form tubular ultra-filtration membrane finished product.Run under routine, about follow-on test two weeks, obtain the flux decline situation of film, and pass through the contact angle of contact angle tester test membrane.
Conveniently film properties evaluation method, pressure be 0.1MPa, at temperature is 25 DEG C, the initial pure water flux of this film is 1010L/m
2h, the pure water flux running two weeks caudacoria is 250L/m
2h, flux decline 75.2%; The contact angle of film is 60 °.Compared with embodiment example 6, flux decline is large.
comparative example 2
By 80 parts of 1-METHYLPYRROLIDONEs, 3 parts of polyvinylpyrrolidones, 1 part of fumaric acid is placed in there-necked flask ultrasonic wave process 30 minutes at 40 DEG C; Obtain solution.16 parts of polyether sulfones are joined in solution, stirs 8h prior to 70 DEG C with the mixing speed of 200-400r/min, be then warming up to 85 DEG C and stir 3h, then cool to 70 DEG C of stirrings 8 hours, obtain casting solution.Be carry out vacuum defoamation 30-40 minute under the vacuum condition of 0.1MPa in vacuum by casting solution, leave standstill 12 hours after deaeration, be then placed in together with non-woven fabrics on dull and stereotyped coating machine, obtain Flat Membrane; Subsequently tubular membrane is left standstill 10 ~ 20 seconds in the air (relative air humidity is 30 ~ 50%) of 25-35 DEG C, after solvent volatilization, immerse rapidly temperature be the mass concentration of 25 DEG C be 20% ethanolic solution coagulating bath inversion of phases film forming, to be immersed in pure water 2 days afterwards, to remove remaining solvent and form tubular ultra-filtration membrane finished product.Run under routine, about follow-on test two weeks, obtain the flux decline situation of film, and pass through the contact angle of contact angle tester test membrane.
Conveniently film properties evaluation method, pressure be 0.1MPa, at temperature is 25 DEG C, the initial pure water flux of this film is 765L/m
2h, after running two weeks continuously, the pure water flux of film is 452L/m
2h, flux decline 55%; The contact angle of film is 62 °.Compared with embodiment example 6, the initial flux of film is lower.
The poly (ether-sulfone) ultrafiltration membrane obtain the embodiment of the present invention 4 and the poly (ether-sulfone) ultrafiltration membrane of German Berghof company are applied to the concentrated experiment of lignin of certain factory, machine runs about one week continuously, under same service condition, same test condition, the flux of test membrane and Decay Rate, and by carrying out the backwash of film with alkali lye after running a period of time, investigate the flux recovery rate of film.
Conveniently film properties evaluation method, pressure be 0.1MPa, at temperature is 25 DEG C, the average flux of the poly (ether-sulfone) ultrafiltration membrane that the embodiment of the present invention 4 is obtained is 350L/m
2h, attenuation rate is 9%, and flux recovery rate is 88%; The average flux of the poly (ether-sulfone) ultrafiltration membrane of Berghof company of Germany is 150L/m
2h, attenuation rate is 20%, and flux recovery rate is 50%.
With reference to Fig. 1, the poly (ether-sulfone) ultrafiltration membrane electron microscopic picture of Fig. 2, Fig. 3, Fig. 4, can find out that the hole wall due to the obtained poly (ether-sulfone) ultrafiltration membrane of embodiment 4 is that particle packing forms by contrast, and the hole wall of the poly (ether-sulfone) ultrafiltration membrane of German Berghof company is that network is poroid, thus the crushing resistance that the obtained poly (ether-sulfone) ultrafiltration membrane of embodiment 4 has had can be explained, and the advantage such as the Decay Rate of flux is little.
Claims (10)
1., for the preparation of a casting solution for antipollution, high-flux ultra-filtration membrane, it is characterized in that by following component formulated by mass percentage:
Polyether sulfone 16-30%
Interworking pore-foaming agent 1 ~ 6%
Organic additive 0.5 ~ 5%
Solvent 60 ~ 80%.
2. casting solution according to claim 1, it is characterized in that described interworking pore-foaming agent is that 2 ~ 5:1 mixes by polyvinylpyrrolidone and alcohol according to mass ratio, described alcohol is selected from one or more arbitrary proportions mixing in polyethylene glycol, ethylene glycol, glycerine, isopropyl alcohol, n-butanol.
3. casting solution according to claim 1, is characterized in that described organic additive is selected from one or more arbitrary proportions mixing in citric acid, acetic acid, malic acid, oxalic acid, salicylic acid, maleic acid, fumaric acid.
4. casting solution according to claim 1, is characterized in that described solvent is selected from the one in DMF, DMA, 1-METHYLPYRROLIDONE.
5. antipollution, a high-flux ultra-filtration membrane, is characterized in that adopting the casting solution described in Claims 1-4 any one to be prepared from.
6. the preparation method of antipollution according to claim 5, high-flux ultra-filtration membrane, is characterized in that comprising the steps:
(1) after interworking pore-foaming agent, organic additive being mixed with solvent, at 20 ~ 40 DEG C, ultrasonic wave disperses 30-60min, obtains solution;
(2) polyether sulfone is joined in solution, stirring and dissolving, obtain casting solution;
(3) casting solution is carried out vacuum defoamation, be placed in together with non-woven fabrics on integrated tubular film applicator or dull and stereotyped coating machine after leaving standstill 6-24h, make tubular membrane or Flat Membrane;
(4) tubular membrane made in step (3) or Flat Membrane are placed in air, treat that solvent volatilizees, in rear rapid immersion coagulating bath, phase inversion forms tubular ultra-filtration membrane or flat plate ultrafiltration membrane.
7. the preparation method of antipollution according to claim 6, high-flux ultra-filtration membrane, it is characterized in that in step (2), polyether sulfone is joined in solution, 8h is stirred with the mixing speed of 200-400r/min in 60-80 DEG C, then be warming up to 80-90 DEG C and stir 2-5h, cool to 70-80 DEG C again and stir 6-10 hour, obtain casting solution.
8. the preparation method of antipollution according to claim 6, high-flux ultra-filtration membrane, it is characterized in that, in step (3), the vacuum defoamation time is 30-60 minute, vacuum is 0.1MPa.
9. the preparation method of antipollution according to claim 6, high-flux ultra-filtration membrane, is characterized in that in step (4), and tubular membrane or Flat Membrane are placed in the air 10 ~ 30 seconds of 25-35 DEG C, relative air humidity is 30 ~ 50%.
10. the preparation method of antipollution according to claim 6, high-flux ultra-filtration membrane, is characterized in that in step (4), described coagulating bath is selected from the one in deionized water, alcoholic solution; Described alcohol is selected from the one in ethanol, propyl alcohol, isopropyl alcohol, n-butanol, and the mass concentration of alcoholic solution is 10 ~ 40%; The temperature of coagulating bath is 20 ~ 35 DEG C, and soak time is 1 ~ 3 day.
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| CN109078502A (en) * | 2018-08-15 | 2018-12-25 | 新疆水处理工程技术研究中心有限公司 | A kind of production method of casting solution, casting film liquor manufacture method and tubular membrane |
| CN112044279A (en) * | 2020-09-17 | 2020-12-08 | 苏州关怀新材料技术研究有限公司 | Film making liquid for processing vaccine separation membrane and preparation method thereof |
| CN113117532A (en) * | 2021-05-06 | 2021-07-16 | 贝源新材料科技(广东)有限公司 | Ultrafiltration membrane for double adsorption of heavy metal and dye and preparation method thereof |
| CN113117532B (en) * | 2021-05-06 | 2022-07-15 | 贝源新材料科技(广东)有限公司 | Ultrafiltration membrane for double adsorption of heavy metal and dye and preparation method thereof |
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