CN101088595A - Process of preparing plate porous membrane with high permeating flux - Google Patents
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- CN101088595A CN101088595A CNA2007100527109A CN200710052710A CN101088595A CN 101088595 A CN101088595 A CN 101088595A CN A2007100527109 A CNA2007100527109 A CN A2007100527109A CN 200710052710 A CN200710052710 A CN 200710052710A CN 101088595 A CN101088595 A CN 101088595A
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Abstract
The present invention is process of preparing plate porous membrane with high permeating flux. The process includes the following steps: 1. mixing certain amount of additive, solvent, polymer and magnetic material to compound filming liquid; and 2. applying 100-18000 gauss cross magnetic field during evaporating and coagulating to form membrane. The plate porous membrane with high permeating flux may be applied alone or as the porous support material for composite membrane.
Description
Technical field:
The invention provides a kind of preparation method of plate porous membrane with high permeating flux, prepared perforated membrane can directly use, and can also use as the porous support materials of other composite membrane.Belong to the membrane separation technique field.
Background technology:
Perforated membrane (comprising micro-filtration membrane and milipore filter) can be widely used in each industrial circle such as petrochemical industry, medical treatment, pharmacy, electronics, food, environmental protection, occupies nearly 60% share in whole film industrial market.Micro-filtration membrane sales volume in 2005 has reached 7.92 hundred million dollars, and 5 years from now on will be with average annual 9.4% speed increment.Milipore filter sales volume at American market in 2005 is 5.79 hundred million dollars, and 2006 is 6.35 hundred million dollars, expects 2011 and will reach 9.08 hundred million dollars, and milipore filter will be with average annual 7.4% speed increment.The height of film permeation flux is the key factor of decision perforated membrane device price and operating cost.Industry in some heavy contamination (food, environmental protection, pharmacy etc.), the permeation flux of perforated membrane operation only has ten to 1/tens of initial flux, its equipment investment and operating cost are very high, it is applied in these industries be restricted, and lack competitiveness; In addition, perforated membrane also is the important support material of preparation composite membrane (as films such as gas separation, pervaporation, counter-infiltrations), and the size of perforated membrane permeation flux is bigger to the resistance size influence of composite membrane, and the basement membrane of high permeating flux can effectively reduce its energy consumption.
There is bibliographical information in organic film, to add the permeation flux that inorganic mineral can improve film, as adopting polymer and hydrophilic inorganic oxide SiO
2Blend system film can obtain the perforated membrane (JP60153903) than high permeating flux.A lot of document [Hennepe H.J.C., Bargeman D., Mulder M.H.V., etal.Zeolite-filled silicone rubber membranes.Part 1.Membranepreparation and pervaporation results.J.Membr.Sci., 1987,35:39-55.Jia M., Peinemann K.V., Behling R.D..Molecular sieving effect of thezeolite-filled silicone rubber membranes in gas permeation.J.Membr.Sci., 1991,57:289-296.] reported the advantage of in organic film, adding inorganic filler: the generation of macropore can be suppressed, the mechanical strength of film and the service life of prolongation film can be strengthened; And because interpore interconnective enhancing, permeability of the membrane effectively improves and cutoff performance keeps constant substantially.The research of organic/inorganic milipore filter has obtained some achievements.[Li pioneer such as Li pioneer, Xiao Changfa. silica-filled poly (ether-sulfone) ultrafiltration membrane. water technology, 2004,30 (6): 320-322] by in polyether sulfone, introducing activated carbon powder and amorphous silica particle, with N, the N dimethyl formamide is a solvent, with water is coagulating bath, utilizes inversion of phases wet method membrane formation mechanism, has made the polyether sulfone ultrafiltration flat sheet membrane of a series of different particle contents, found that: the adding of silica, the cloud point that has changed casting solution is formed; Produced a large amount of interface voids, i.e. the hole, interface; Increase the connectivity of fenestra, improved the hydrophily of film; The flux of film is improved greatly, and kept good rejection; And the combination property of activated carbon powder filling poly (ether-sulfone) ultrafiltration membrane is worse than silica-filled poly (ether-sulfone) ultrafiltration membrane far away.Jiang Yunpeng etc. [Jiang Yunpeng, Wang Rongshu. nanometer SiO
2The preparation of/PVA composite hyperfiltration membrane and performance study. polymer material science and engineering, 2002,18 (5): 177-180. Jiang Yun roc, Wang Rongshu. nanometer SiO
2The preparation of polyvinyl alcohol composite hyperfiltration membrane and application, Treatment of Industrial Water, 2002,22 (5): 12-14.] find that the glass transition temperature and the mechanical property of adding the silica caudacoria in the PVA film all are significantly improved, and have good resistance tocrocking and stability during the membrane filtration oily waste water.[Bottino A. such as Bottino, Capannelli G., Dasti V., etal.Preparation and properties of novel organic-inorganic porousmembranes.Sep.Purif.Technol., 2001,22-23:269-275] find that permeability of the membrane can increase along with the dioxide-containing silica increase after rare PVDF solution adds silica, cutoff performance then reduces; And after dense PVDF solution added silica, permeability of the membrane can be along with not influence significantly of dioxide-containing silica increase; After adding silica, the viscosity increased of film liquid, knifing is not only easy on nonwoven, and the mechanical strength height of film, and permeation flux and rejection are also better.[Doyen W. such as Doyen, Adriansens W., Molenberghs B., et al.Acomparison between polysulfone, zirconia and organo-mineral membranes for use in ultrafiltration.J.Membr.Sci., 1996,113:247-258.] utilizing molecular cut off close tubular type polysulfones, zirconia and zirconia-polysulphone super-filter membrane to carry out the ultrafiltration experiment that lactalbumin recycles to find: the pure water permeation flux of organic/inorganic film is the highest, polymer film minimum; The skin thickness of organic/inorganic film is less, and inorganic particles exists near the cortex, the porosity height of epidermal area; In filtration experiment, polysulfones, zirconium oxide film have identical permeability factor 50L/h.m
2.bar, on the contrary, the permeability factor of organic/inorganic film almost is three times of organic film, reaches 135L/h.m
2.bar, this belongs to the difference of film surface porosity factor.[Genn é I., Kuypers S., Leysen R..Effect of the addition of ZrO2 to polysulfone basedUF membranes.J.Membr.Sci., 1996,113:343-350 such as Genne; Genne I., Doyen W., Adriansens W.et al.Organomineral ultrafiltration membranes.Filtr.Sep., 1997,34:964-973.] find that the permeation flux of organic/inorganic film increases along with the increase of inorganic content, but microphoto does not observe the variation of film surface apertures and porosity, and the variation of permeation flux is the result that the existence of inorganic filler destroys normal transformation behavior; When the content of filler reaches 40wt% when above, the inhibition of inorganic filler makes the hole density of epidermal area of film increase, and when continuing to increase amount of filler, can influence the formation of epidermal area, strengthens the connection between porous support layer.[Aerts P., Hoof E.V., Leysen R.et al such as Aerts.Polysulfone-Aerosil composite membranes.Part 1.Theinfluence of the addition of Aerosil on the formation process andmembrane morphology.J.Membr.Sci.，2000，176：63-73。Aerts P., GenneI., Kuypers S., et al.Polysulfone-aerosil composite membranes.Part2.The influence of the addition of aerosil on the skin characteristicsand membrane properties.J.Membr.Sci., 2000,178:1-11.] studied the membrane formation mechanism of organic/inorganic milipore filter first, discovery is when adding the inorganic filler of a small amount of (below the 1vol.%), filler can increase the mixed speed of taking off of film, when continuing to increase the content of filler, the viscosity of film liquid increases, and the precipitating reagent in the coagulation bath diffuses into speed in the film liquid and the formation speed of film all can reduce; The addition of inorganic matter is when 2vol.% is following, and along with inorganic addition, the hole density of cortex increases, and the aperture meets normal distribution, and the permeation flux of film enlarges markedly.When further increasing the inorganic filler amount, the aperture becomes bipolar distribution; When addition reaches 3vol.% when above, permeability of the membrane can reduce, and the hole density of cortex is higher.
Bibliographical information [Jian P., Yahui H., Yang W., Linlin L..Preparationof polysulfone-Fe are arranged recently
3O
4Composite ultrafiltration membrane and its behaviorin magnetic field, Journal of Membrane Science 284 (2006) 9-16.], in polysulfones, add Fe
3O
4The preparation milipore filter, the pure water permeation flux of made film does not change under the effect of magnetic field, but the rejection of film reduces along with the increase of magnetic field intensity.
Bibliographical information [Huang Z.Q, Guo X.P, Guo C.L, Zhang Z..Magnetizationinfluence on the performance of ferrosoferric oxide:polyacrylonitrilemembranes in ultrafiltration of pig blood solution.BioprocessBiosyst.Eng., 2006,28:415-421] add small amount of Fe at PAN
3O
4(Fe
3O
4Be lower than 31: 69 with the mass ratio of PAN) time, the pure water permeation flux of made film is with Fe under 3800 Gausses' quadrature field effect
3O
4The variation of content presents irregular variation, and the effect of part magnetic field is pure water permeation flux the hanging down than unmagnetized film of the magnetized film of preparation down; But when filtering pig watery blood solution, the absolute permeation flux of magnetized film will be higher than the unmagnetized film with relative permeation flux.Document [Huang Z.Q, Chen Z.Y., Guo X.P, Zhang Z., GuoC.L.Structures and separation properties of PAN-ultrafiltrationmembranes prepared under an orthogonal magnetic field.Ind.Eng.Chem.Res., 2006,45:7905-7912.] studied at PAN and added small amount of Fe
3O
4(Fe
3O
4Be lower than 24: 76 with the mass ratio of PAN) situation, discover: under 1500 Gausses' quadrature field effect, Fe
3O
4The orientation of particulate is consistent with the action direction in magnetic field, and magnetic field effect makes the finger-like pore of porous supporting body of film become oblique arrangement by arranged vertical, has provided Fe simultaneously
3O
4Content to the influence of film permeation flux: the pure water permeation flux of film is with Fe
3O
4Content be non-linearity relation.
In sum, when adding the high-load magnetisable material in film liquid, the quadrature field effect is not seen bibliographical information as yet to the influence of membrane permeability energy.
The present invention is given in the film liquid when adding the high-load magnetisable material, if use the effect of quadrature field in the process of system film, the permeation flux of film can significantly improve, and the permeation flux of permeable membrane increases with the increase of magnetisable material content.
Summary of the invention:
The preparation method who the purpose of this invention is to provide a kind of plate porous membrane with high permeating flux by add the magnetisable material of high-load at preparation liquid, uses quadrature field to be used for preparing the perforated membrane of high permeating flux in film forming procedure.
Technical scheme of the present invention is: a kind of preparation method of plate porous membrane with high permeating flux is characterized in that:
1., join preparation liquid with polymer, magnetic material, additive and solvent;
Magnetic material and the polymer content in the gross mass in film liquid is 8～50%, and the mass ratio of magnetic material and magnetic material+polymer is 35～99wt%;
The content of additive in film liquid gross mass is 2～15%;
That is: film liquid is formulated by polymer P, magnetic material M, additive A and solvent S, wherein,
(M+P)/(M+P+A+S)＝(8～50)wt％；
M/(M+P)＝(35～99)wt％；
A/(M+P+A+S)＝(2～15)wt％；
2., in system evaporation of film and gel process, apply quadrature field, magnetic field intensity is 100～18000 Gausses.
The preparation method of aforesaid high permeating flux porous flat plate film is characterized in that may further comprise the steps:
(1), get after certain quantity of additive is dissolved in solvent, the mixture that adds polymer and magnetic material is made into suspension, by continuous vibration (or stirring or ultrasonic wave effect) after being made into uniform aaerosol solution under 30～70 ℃ the condition, deaeration; The additive that contains 2～15wt% in the aaerosol solution of gained; The polymer and the magnetic material that contain 8～50wt%, and the mass ratio of polymer and magnetic material is 1: 99～65: 35.
(2), go up knifing at porous support materials (or glass plate) then, make the film of striking enter magnetic field air evaporation 5～300 seconds, film enters under the effect of magnetic field and carries out gel in the coagulant liquid after 30～1200 seconds then, puts into distilled water at last and soaks 0.5～24 hour.
The preparation method of aforesaid high permeating flux porous flat plate film is characterized in that: after porous support materials (or glass plate) is gone up knifing, humidity less than 80%, 5～35 ℃ of air evaporation＞0 of temperature second ,≤120 seconds, and then enter magnetic field.
Above-mentioned additive is a kind of or mixture in polyvinylpyrrolidone, polyethylene glycol, lithium nitrate, lithium chloride, potassium nitrate, potassium chloride, glycerine, acetone, the formic acid.Said polymer is one or more in polysulfones, polyether sulfone, SPSF, sulfonated polyether sulfone, polysulfonamides, nylon 6, nylon 66, aromatic polyamides, polyacrylonitrile, polyvinyl fluoride, polyvinylidene fluoride and the poly-trifluoro-ethylene.
Above-mentioned magnetic material is one or more in tri-iron tetroxide, di-iron trioxide, nickel oxide, cobalt oxide, magnetic carbon nano-tube, magnetic carborundum, the organo-metallic material.
Above-mentioned solvent is one or more in dimethyl formamide, dimethylacetylamide, methyl-sulfoxide, N-methyl pyrrolidone, the acetone.
Above-mentioned porous support materials is polyester non-woven fabric or terylene silk fabric.
Above-mentioned magnetic field is the quadrature field that two or polylith permanent magnet form, and magnetic field intensity is 100～18000 Gausses.
Above-mentioned coagulant liquid is water or adds inorganic salts or the aqueous solution of organic reagent formation.
The present invention is by adding a large amount of magnetic materials (mass ratio of polymer and magnetic material is 1: 99～65: 35) at film liquid, in film forming (evaporation and gel) process, use the quadrature field effect then, make membrane pore structure in order, fenestra connects degree height, porosity height, cortex resistance thin, film and reduces, and then can prepare the perforated membrane of high permeating flux.This method can prepare micro-filtration membrane, also can prepare milipore filter; This method is simple, can be suitable for the film-forming process of manual discontinuous small lot, also goes for the production in enormous quantities of continuous industryization; Prepared film can directly directly be used as micro-filtration membrane or milipore filter, can also be as the porous support materials of composite membrane.
Description of drawings
Accompanying drawing 1 is the device schematic diagram of the quadrature field effect of the embodiment of the invention.
Accompanying drawing 2 is the section structure of the embodiment of the invention 1 made comparative film.
Concrete embodiment
Embodiment 1: polyacrylonitrile/Fe
3O
4The preparation of perforated membrane
Referring to Fig. 1.Quadrature field can be prepared from by two or above permanent magnet and permeability magnetic material, and the quantity of magnet is determined according to the area of system film; The intensity in magnetic field can be controlled by distance between the last lower magnet and the position of film in magnetic field, and the distance between the last lower magnet is big more, and magnetic field intensity is more little; The magnetic field action intensity was less when film was in the centre position, magnetic field, and the distance between film and the last lower magnet is near more, and magnetic field intensity is big more.
Respectively get 100ml dimethyl sulfoxide (DMSO) (DMSO) and place 5 iodine flasks,, treat that it fully dissolves to wherein adding 3.9g polyvinylpyrrolidone (PVP) respectively; Take by weighing 57.6g, 33.6g, 21.6g, 14.4g and 9.6g tri-iron tetroxide (Fe successively
3O
4), and join respectively in above-mentioned 5 iodine flasks after mixing evenly with 14.4g polyacrylonitrile (PAN) respectively, after shaking up fast, after the 55-60 ℃ of dissolving of vibrating down is even, deaeration.Knifing on glass plate, (humidity is less than 50% at air, temperature is 20 ℃) in the evaporation 5s after about, put into quadrature field (magnetic field intensity 1000 Gausses) and continue evaporation 25s, magnetic field effect transfer carry out gel 15min in the entry after, take out film and put into distilled water and soak that to obtain magnetized film in 24 hours stand-by; The preparation method of the unmagnetized film that comparative study is used is as follows: knifing on glass plate, after putting distilled water behind the evaporation 30s in the air (humidity is less than 50%, and temperature is 20 ℃) and carrying out gel 15min, take out film put into distilled water soak 24 hours stand-by.The performance of resulting film sees Table 1, as can be seen from Table 1, when the content of magnetisable material in the film is low (as 4C and 4W), the permeation flux of magnetized film is lower than unmagnetized film, and permeability of the membrane can just can be improved significantly when having only content when magnetisable material above certain proportion.
Table 1: polyacrylonitrile/Fe
3O
4The performance of perforated membrane
| PAN/Fe 3O 4wt | 20∶80 | 30∶70 | 40∶60 | 50∶50 | 60∶40 | |||||
| Numbering | The 8C magnetization | The 8W unmagnetized | The 7C magnetization | The 7W unmagnetized | The 6C magnetization | The 6W unmagnetized | The 5C magnetization | The 5W unmagnetized | The 4C magnetization | The 4W unmagnetized |
| Average film thickness (μ m) | 305 | 300 | 293 | 292 | 327 | 317 | 307 | 300 | 330 | 310 |
| Pure water permeation flux L.m -2.h -1(20℃， 0.1MPa) | 261 | 93 | 238 | 68 | 152 | 97 | 95 | 65 | 72 | 84 |
| Rejection (%) to bovine serum albumin | 98.8 | 98.9 | 100 | 98.8 | 98.9 | 91.3 | 99.9 | 98.4 | 98.1 | 97.2 |
The section structure of film is seen accompanying drawing 2.From accompanying drawing 2 as can be seen, when adding the magnetisable material of high-load in the film, making made film of time spent in made film under the quadrature field effect and no magnetic field compares: the pore structure of made film is more orderly under the effect of magnetic field, and fenestra connects the porosity height of degree height, film, the cortex of film approaches.
Embodiment 2:
Get 100ml dimethylacetylamide (DMAC) and place iodine flask,, treat that it fully dissolves to wherein adding 5.0g polyvinylpyrrolidone (PVP) respectively; Take by weighing 12.0g tri-iron tetroxide (Fe
3O
4) join in the above-mentioned iodine flask after mixed with the 20.0g polysulfones, after shaking up fast, at 55～60 ℃ down after the vibration dissolving evenly, deaeration.Knifing on glass plate, (humidity is less than 50% at air, temperature is 20 ℃) in the evaporation 5s after, put into quadrature field (magnetic field intensity 1800 Gausses) and continue evaporation 25s, after under magnetic field effect, adding water and carrying out gel 15min, the taking-up film is put into the distilled water immersion and was obtained magnetized film in 24 hours, and recording its pure water permeation flux is 1300L.m
-2.h
-1(25 ℃ 0.1MPa), is 43.9% to the rejection of bovine serum albumin; And on glass plate knifing, after putting distilled water behind the evaporation 30s in the air (humidity is less than 50%, and temperature is 20 ℃) and carrying out gel 15min, take out film to put into distilled water and soak and obtained the unmagnetized film in 24 hours, recording its pure water permeation flux is 32.3 L.m
-2.h
-1(25 ℃ 0.1MPa), is 85.5% to the rejection of bovine serum albumin.
Embodiment 3:
Get 100ml N-methyl pyrrolidone, 2.0g polyethylene glycol and 16.0g diamyl organometallic polymer ferromagnet particulate after 198 ℃ of following heating for dissolving, add 10.0ml formic acid and 1.0g polyether sulfone after being cooled to 70 ℃, after mixing, after 60 ℃ stirring is dissolved evenly fully down, deaeration.Knifing on polyester non-woven fabric, (humidity is less than 50% at air, temperature is 20 ℃) in the evaporation 5s after, put into quadrature field (magnetic field intensity 10000 Gausses) and continue evaporation 25s, magnetic field effect transfer carry out gel 15min in the water-bath after, the taking-up film is put into the distilled water immersion and was obtained magnetized film in 24 hours, and recording its pure water permeation flux is 730L.m
-2.h
-1(25 ℃ 0.1MPa), is 90.9% to the rejection of bovine serum albumin; And on polyester non-woven fabric knifing, (humidity is less than 50% at air, temperature is 20 ℃) in after evaporation puts into distilled water behind the 30s and carries out gel 15min, take out film and put into distilled water and soak and obtained the unmagnetized film in 24 hours, recording its pure water permeation flux is 230.0L.m
-2.h
-1(25 ℃ 0.1MPa), is 91.5% to the rejection of bovine serum albumin.
Embodiment 4:
Get 80ml dimethylacetylamide (DMAC) and 20ml N-methyl pyrrolidone places iodine flask,, treat that it fully dissolves to wherein adding the 13.0g polyethylene glycol respectively; Take by weighing 30.0g magnetic carbon nano-tube, 5.0g polysulfones and 5.0g polyether sulfone and join in the above-mentioned iodine flask after mixed, after shaking up fast, under 55～60 ℃ with supersonic oscillations dissolving evenly after, deaeration.Knifing on glass plate, (humidity is less than 60% at air, temperature is 22 ℃) in the evaporation 3s after, put into quadrature field (magnetic field intensity 4500 Gausses) and continue evaporation 12s, magnetic field effect transfer carry out gel 15min in the entry after, the taking-up film is put into the distilled water immersion and was obtained magnetized film in 24 hours, and recording its pure water permeation flux is 460L.m
-2.h
-1(25 ℃ 0.1MPa), is 96.7% to the rejection of bovine serum albumin; And on glass plate knifing, after putting distilled water behind the evaporation 15s in the air (humidity is less than 60%, and temperature is 22 ℃) and carrying out gel 15min, take out film to put into distilled water and soak and obtained the unmagnetized film in 24 hours, recording its pure water permeation flux is 180.0 L.m
-2.h
-1(25 ℃ 0.1MPa), is 97.5% to the rejection of bovine serum albumin.
Embodiment 5:
Get 100ml dimethylacetylamide (DMAC) and place iodine flask,, treat that it fully dissolves to wherein adding the 5.0g lithium nitrate; Take by weighing 45.0g magnetic carbon nano-tube, 6.0g polysulfones and 4.0g SPSF and join in the above-mentioned iodine flask after mixed, after shaking up fast, under 55～60 ℃ with supersonic oscillations dissolving evenly after, deaeration.Knifing on glass plate, (humidity is less than 60% at air, temperature is 15 ℃) in the evaporation 3s after, put into quadrature field (magnetic field intensity 4500 Gausses) and continue evaporation 57s, under magnetic field effect, put into after the water-bath (5 ℃) that contains 10wt%NaCl carries out gel 25min, the taking-up film is put into the distilled water immersion and was obtained magnetized film in 24 hours, and recording its pure water permeation flux is 78 L.m
-2.h
-1(25 ℃ 0.1MPa), is 83.7% to the rejection of polyethylene glycol (molecular weight 6000); And on glass plate knifing, (humidity is less than 60% at air, temperature is 15 ℃) in evaporation put into behind the 60s after the water-bath (5 ℃) that contains 10wt%NaCl carries out gel 25min, take out film and put into distilled water and soak and obtained the unmagnetized film in 24 hours, recording its pure water permeation flux is 19.0L.m
-2.h
-1(25 ℃ 0.1MPa), is 79.4% to the rejection of polyethylene glycol (molecular weight 6000).
Embodiment 6:
Get 150ml dimethylacetylamide (DMAC) and place iodine flask,, treat that it fully dissolves to wherein adding 10.0g polyethylene glycol and 3.0g polyvinylpyrrolidone respectively; Take by weighing 30.0g Fe
3O
4, 10.0g magnetic carbon nano-tube, 5.0g polysulfones join in the above-mentioned iodine flask after mixed, after shaking up fast, under 55-60 ℃ with supersonic oscillations dissolving evenly after, deaeration.On polyester non-woven fabric, film, (humidity is less than 60% at air to put into quadrature field (magnetic field intensity 8000 Gausses) immediately, temperature is 25 ℃) the following evaporation of environment 30s, then after putting into distilled water gel 25min under the effect of magnetic field, the taking-up film is put into the distilled water immersion and was obtained magnetized film in 24 hours, and recording its pure water permeation flux is 890L.m
-2.h
-1(25 ℃ 0.1MPa), is 80.0% to the rejection of bovine serum albumin; But not the pure water permeation flux of magnetized film is 570.0L.m
-2.h
-1(25 ℃, 0.1MPa), rejection is 83.4%.
Claims (5)
1, a kind of preparation method of plate porous membrane with high permeating flux is characterized in that:
1., join preparation liquid with polymer, magnetic material, additive and solvent;
Magnetic material and the polymer content in the gross mass in film liquid is 8～50%, and the mass ratio of magnetic material and magnetic material+polymer is 35～99wt%;
The content of additive in film liquid gross mass is 2～15%;
2., in system evaporation of film and gel process, apply quadrature field, magnetic field intensity is 100～18000 Gausses.
2, the preparation method of high permeating flux porous flat plate film as claimed in claim 1 is characterized in that may further comprise the steps:
1., get after certain quantity of additive is dissolved in solvent, the mixture that adds polymer and magnetic material is made into suspension, by continuous vibration or stirring or ultrasonic wave effect, after being made into uniform aaerosol solution under 30～70 ℃ the condition, deaeration; The additive that contains 2～15wt% in the aaerosol solution of gained; The polymer and the magnetic material that contain 8～50wt%, and the mass ratio of polymer and magnetic material is 1: 99～65: 35.
2., knifing on porous support materials or glass plate then, make the film of striking enter magnetic field air evaporation 5～300 seconds, film enters under the effect of magnetic field and carries out gel in the coagulant liquid after 30～1200 seconds then, puts into distilled water at last and soaks 0.5～24 hour.
3, the preparation method of high permeating flux porous flat plate film as claimed in claim 2, it is characterized in that: behind knifing on porous support materials or the glass plate, humidity less than 80%, 5～35 ℃ of air evaporation＞0 of temperature second ,≤120 seconds, and then enter magnetic field.
4, the preparation method of high permeating flux porous flat plate film as claimed in claim 1 is characterized in that:
Described perforated membrane comprises micro-filtration membrane and milipore filter;
Described polymer is selected from one or more in polysulfones, polyether sulfone, SPSF, sulfonated polyether sulfone, polysulfonamides, nylon 6, nylon 66, aromatic polyamides, polyacrylonitrile, polyvinyl fluoride, polyvinylidene fluoride and the poly-trifluoro-ethylene;
Described magnetic material is selected from one or more in tri-iron tetroxide, di-iron trioxide, nickel oxide, cobalt oxide, magnetic carbon nano-tube, magnetic carborundum, the organo-metallic material;
Additive is a kind of or mixture in polyvinylpyrrolidone, polyethylene glycol, lithium nitrate, lithium chloride, potassium nitrate, potassium chloride, glycerine, formic acid, the acetone;
Solvent is one or more in dimethyl formamide, dimethylacetylamide, methyl-sulfoxide, N-methyl pyrrolidone, the acetone;
5, the preparation method of high permeating flux porous flat plate film as claimed in claim 2 is characterized in that: porous support materials is polyester non-woven fabric or terylene silk fabric; The quadrature field that described magnetic field forms for two or more than two permanent magnet, magnetic field intensity is 100～18000 Gausses; Described coagulant liquid is water or adds inorganic salts or the aqueous solution of organic reagent formation.
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