CN1583232A - Manufacture and products of hollow fiber membrane of outer pressured polyvinylidene fluoride by immersion gelation - Google Patents
Manufacture and products of hollow fiber membrane of outer pressured polyvinylidene fluoride by immersion gelation Download PDFInfo
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Abstract
The invention relates to a preparation method of exo-pressure type poly (vinylidene fluoride) hollow fiber membrane spinned utilizing an immersion-coagulation method and the product thereof. The invention is performed mainly through the following steps: dissolving and stirring at a certain temperature to obtain a membrane forming solution; by means of a double-tube orifice, spinning the membrane forming solution together with a composite supporting solution which is in the inner tube of the orifice; after a rapid evaporation, performing the two-stage phase-separating coagulations; after a potch, hydrophilizating the resulted phase inversion membrane; thus, obtaining integrally and continuously the exo-pressure type hollow fiber membrane having double barrier layers and a completely spongy supporting layer. Therefore, the invention is provided with a lot of characteristics, such as the formulation of the membrane forming solution being reasonable, the evaporation and immersion spinning method, the two-stage phase-separation coagulations, and the hydrophilization treatment, as well as the technique for forming membrane integrally and continuously being simple and easy without high restricts to device, the technique process being controlled easily, etc. And the membrane is provided with high compression strength and large water permeation flux, and its property is deteriorated very slowly, and cut-off deposits are difficult to form on the membrane surface.
Description
Technical field
The present invention relates to a kind of method for making of hollow-fibre membrane, especially relate to and a kind ofly immerse the preparation method of gel method spinning external-compression type Kynoar hollow-fibre membrane and adopt a kind of preparation liquid prescription that the HMW Kynoar combines with a high proportion of organic additive and the goods of gained thus.
Background technology
Kynoar (PVDF) has good separating property and chemical stability because of it, obtains gradually paying attention in membrane separation technique.Prior art often adopts the Kynoar of 30,000-200,000 molecular weight (MW), and to improve the way of the PVDF concentration in the preparation liquid, makes prepared hollow-fibre membrane obtain enough intensity.For example, disclose a kind of membrane material based on the PVDF material in the U.S. Pat 5066401, the ratio of PVDF reaches 70%-98% in its preparation liquid.But, adopt the result of the PVDF of high concentration to be, have to improve melt temperature, could be with the abundant fusion of PVDF (melt temperature of preparation liquid have reached 240 ℃ in the above-mentioned United States Patent (USP)), will produce the seondary effect that untimely thermic is separated thus, influence the performance of film forming again.On the other hand, though adopt the prepared hollow-fibre membrane of this preparation method to possess certain intensity, the porosity of film still can not be satisfactory.Especially this polymer is when the higher temperature fusion, gas and space in it are discharged from, make the density of polymerization slurry reach higher value, highdensity result must be low porosity and big aperture (disclosed film forming average pore size is 0.45 μ m in the above-mentioned United States Patent (USP)).
PVDF is a kind of hydrophobic material, generates not hydrophilic dense layer surface during the system film easily.Simultaneously, the PVDF of lower molecular weight easily makes wide-aperture film, and the PVDF of HMW easily makes the film of small-bore.Report is common in press mold in plate porous membrane, the doughnut, or the film nominal pore size is many with seeing of 0.1-0.45 μ m, and film section supporting layer is seen many with two-way finger-like macropore, needle-like macropore, unidirectional finger-like pore or part finger-like pore in other words.
Asymmetric membrane supports subgrade by porous and thin cortex constitutes, in the porous subgrade, the made film of common liquid-liquid phase separation can be observed finger-like, there be (shown in accompanying drawing 6 and accompanying drawing 7) in the needle-like macroscopic cavitation, the existence of macroscopic cavitation is normally disadvantageous, will cause weak part in the inside of film, be easy to deposition in the application.
Though adopt the porous Kynoar hollow-fibre membrane of conventional method manufacturing that cortex is arranged, have big hole to have that (JP for example, 1-22003 B), therefore can cause the reduction of film mechanical strength on the film supporting layer.On the other hand, Japan Patent JP54-16832A discloses one and has done the solvent preparation with acetone and have the method for the polyvinylidene fluoride film of uniform pore size, acetone boiling point low (56.5 ℃), it or not the good solvent of PVDF, for dissolving resin need be heated to nearly boiling temperature, preparation liquid has unsettled defective like this, at room temperature easy gel, and have with the preparation liquid that acetone is made solvent that PVDF content is low, viscosity is low, can not form the problem of self-supporting doughnut.
Someone is in order to improve the complexity of filming technology, applied for the patent (95117497.5) of " Kynoar doughnut porous membrane manufacturing method " by name, this patent disclosure a kind of the employing do the film-forming method that a wet method or wet method are produced the Kynoar doughnut of high transit dose, larger aperture, make it to have unsymmetric structure, comprise following substances in the wherein said preparation liquid: Kynoar 15～25% (weight), non-solvent 0.5～5%, surfactant 1～10%, macromolecule pore former 1～20%, solvent 82.5～40%.Subsequently, this application people has applied for " vinylidene doughnut porous membrane manufacturing method and product " (98103153.6) by name again on this basis.It is that the Kynoar doughnut perforated membrane that will spin out with a wet method or a dried wet method carries out stretch processing, and tensile elongation is controlled at 60～300%.The nominal pore size of the Kynoar doughnut perforated membrane of being made by this method is that 0.1～1.0 μ m, pure water permeation flux are 300～10000L/m
2.h.0.1Mpa, porosity is 70-90%.
More than form, the membrane structure of all kinds of film, in application, easily influence the compression strength of film, form easily that deposition is held back on the film surface, film properties is decayed.Because the effect of the tension force of water surface, the prepared small-bore of prior art milipore filter water flux is also lower usually, has limited its application in aqueous phase separation.
Summary of the invention
The present invention mainly is that the proportioning of solution existing in prior technology lower molecular weight PVDF preparation liquid is very unreasonable, and the preparation liquid preparation is difficulty comparatively, and filming technology is comparatively complicated, permeable amount is very not high; Perhaps in order to increase permeable amount, adopt the technical problem of finger-like pore structure (can influence the overall mechanical properties and the service life of doughnut, the doughnut film body easily is crushed) etc. usually at the porous support layer of described doughnut.
The purpose of this invention is to provide a kind of PVDF resin and the preparation liquid prescription of a high proportion of organic additive (as pore-foaming agent) and method for making that gel method spinning external-compression type Kynoar hollow-fibre membrane is immersed in employing of utilizing high weight average molecular weight (MW); The present invention also provides a kind of this method for making that adopts to produce a kind of dissymmetrical structure that has simultaneously, inside and outside pair of cortex, and the porous support layer of this film is the hollow fiber ultrafiltration membrane material of the spongy network structure layer in no hole.
Above-mentioned technical problem of the present invention is mainly solved by following technical proposals: a kind of method for making of immersing gel method spinning external-compression type Kynoar hollow-fibre membrane is to finish through following step:
A, following substances is added in the reactor, at a certain temperature, dissolving is stirred and made preparation liquid: the Kynoar of high weight average molecular weight is 18-25% (weight ratio); Organic additive is 22-25% (weight ratio); Inorganic additive is 0.5-5.0% (weight ratio); Solvent is 59.5-45.0% (weight ratio);
B, above-mentioned preparation liquid together spray with placing the compound support liquid in the shower nozzle central tube by two sleeve pipe shower nozzles;
C, after rapid evaporation, described preparation liquid together enters in the one-level immersion fluid with compound support liquid in the pipe, then enters in the secondary coagulant liquid and precipitates, and carries out two-stage phase-separating coagulations;
D, after rinsing, this phase inversion membrane is carried out hydrophilic treated;
E, the integrated external-compression type hollow-fibre membrane of making two cortexes, complete spongy supporting layer continuously.
The present invention adopts the PVDF resin material of high weight average molecular weight, both can guarantee the mechanical strength of film forming, avoided high concentration PVDF to bring the fusion difficulty again, simultaneously, it is combined with the organic additive (as pore former) of higher proportion, having overcome it dexterously influences the drawback of filming performance, has created condition for the present invention adopts the production method of immersing gel method spinning external-compression type to make the Kynoar hollow-fibre membrane.
As preferably, the inherent viscosity of described Kynoar is 1.65-2.00, and weight average molecular weight is 400,000 to 800,000 dalton.
As preferably, described Kynoar inherent viscosity is 1.75-1.85, and weight average molecular weight is 500,000-700,000 dalton.When Kynoar surpasses when a kind of, total addition is constant.
In the doughnut film forming procedure, preparation liquid is through short time evaporation (0.02 second-0.2 second), enter precipitating reagent, the exchange of solvent and precipitating reagent two surfaces inside and outside the nascent state fiber take place simultaneously, and interact and influence the final structure of film, the present invention makes full use of this characteristics, by preparing mixed core liquid: 10-80% (weight ratio) solvent, 5-30% (weight ratio) alcohols and polyalcohols, 0.5-5% (weight ratio) surfactant and deionized water, the exchange rate of control inner surface, reduce settling velocity, avoid the macroscopic cavitation to produce, make fiber in traction, can not make film produce thin neck shape joint again, influence film quality owing to the viscosity of core liquid.By the exchange rate of two-stage precipitation control nascent state film outer surface, to grasp solution and in the solvent of 40-80% (weight ratio), precipitated 1.5 seconds-4.0 seconds, the back is precipitated 4 seconds-120 seconds in 5-30% (weight ratio) solvent, to postpone the phase-splitting time.The exchange rate that should grasp interior precipitating reagent (core liquid) is slightly faster than outer precipitating reagent exchange rate.Can obtain external-compression type, local section shows as: the sponge structure Kynoar hollow fiber ultrafiltration membrane (shown in the accompanying drawing 1-5) that increases gradually to endodermis network hole from exodermis.The invention solves the problems such as macroscopic cavitation that exist in the structure of the doughnut of being produced in existing such technology.
The kind of additive, consumption have very remarkable influence to the performance of film, for different systems, the action effect of identical additive is widely different, and the additive of larger molecular weight easily forms macropore, can change the crosslinked of molecule in the solution, as polyvinylpyrrolidone etc.Less additive easily forms aperture, as lithium chloride etc., because micromolecule additive can enter the gap of polymer molecular chain and the functional group's complexing in the polymer molecule, and the stability of increase film properties.Coordinate mutually by multiple additives, organic cooperation can reach preferable pore effect, improves membrane flux.
Except that the factor that influences film forming characteristics, the membrane aperture size is also relevant with the quantity of the pore-foaming agent that added in the preparation liquid, and in some sense, pore-foaming agent is the hole filler that serves as in the preparation liquid; In the film gel process, pore-foaming agent then can be precipitated out, and pore-foaming agent and solvent in the process of external diffusion, exchange, have formed membrane pores from preparation liquid.By the quantity of control pore-foaming agent and to the speed of external diffusion, can control the porosity and the pore size of film forming.Therefore, the pore-foaming agent of the high quantity that employing in the present invention is suitable helps the fusion of PVDF resin, can reduce melting temperature.As preferably, described organic additive is meant two or more in polyvinylpyrrolidone class, polyethylene glycols, polyvinyl alcohol, emulsifying agent Tween, the triton class emulsifying agent, and when organic additive surpassed two kinds, the total amount addition was constant.
As preferably, in the described preparation liquid, the ratio of organic additive is 22%-25% (weight ratio).
As preferably, described organic additive can be polyvinylpyrrolidone (PVP), and its weight average molecular weight range is 11000-100 ten thousand dalton; The ratio of described organic additive is 22%-25% (weight ratio).
As preferably, described inorganic additive is meant one or both in lithium chloride, lithium nitrate, sodium acetate, the sodium nitrate solution, and when organic additive surpassed two kinds, the total amount addition was constant.
As preferably, described solvent is meant one or both in N-methyl pyrrolidone, dimethyl formamide, dimethylacetylamide, dimethyl sulfoxide (DMSO), the triethyl phosphate, and when organic additive surpassed two kinds, the total amount addition was constant.These all solvents all can make film form preceding top layer, and this layer top layer will cause the raising of solvent exchange speed.
As preferably, described compound support liquid is meant solvent 10-80% (weight ratio), alcohols and polyalcohols 5-30% (weight ratio), the surfactant 0.5-5% (weight ratio) of Kynoar, and all the other are deionized water.
As preferably, the evaporation time before the described phase-splitting gel is 0.02-0.2 second; The component of described one-level immersion fluid is that the solvent of Kynoar is 40-80% (weight ratio), and gel time is 1.5-4.0 second; The component of secondary coagulant liquid is that the solvent of Kynoar is 5-30% (weight ratio), and gel time is 4.0-120 second.
As preferably, described hydrophilizing agent is one or more in the triton type emulsifying agent of hydroxypropyl cellulose, 0.5-5% (weight ratio) of glycerine, the 0.05-5% (weight ratio) of 10-80% (weight ratio).
A kind of according to the aforesaid method for making of immersing gel method spinning external-compression type Kynoar hollow-fibre membrane, the goods of gained hollow-fibre membrane are inside and outside pair of cortex construction, described exodermis is than endodermis densification, the supporter of film section therebetween is full spongelike structure, and the milipore filter nominal pore size is 0.01-0.06 μ m, and film pure water permeation flux is 150-800L/m
2.h.25 ℃ .1bar porosity 70-85%, tunica fibrosa compression strength 〉=0.5Mpa.
Therefore, the present invention compares with existing filming technology that to have a preparation liquid prescription reasonable, and spinning is immersed in the evaporation of being adopted, two-stage phase-separating coagulations, hydrophilic treated, simple, the easy row of the filming technology of integrated continuous film forming, less demanding to equipment, technical process is easy to characteristics such as control.The hollow-fibre membrane that spins out thus has the rational in infrastructure of the complete spongy inside and outside pair of cortex of supporting layer, the compression strength height, and water flux is big, and the film properties decay is slower, is difficult for forming characteristics such as holding back deposition on the film surface.Can be widely used in biochemistry, food, medical treatment, brew alcoholic beverages, in multiple industrial circle such as purification or the household products.
Description of drawings
Accompanying drawing 1 is the Electronic Speculum photograph in hollow-fibre membrane of the present invention cross section;
Accompanying drawing 2 is Electronic Speculum photographs of hollow-fibre membrane partial cross-section of the present invention;
Accompanying drawing 3 is Electronic Speculum photographs of hollow-fibre membrane exodermis of the present invention;
Accompanying drawing 4 is Electronic Speculum photographs of the spongy supporting layer of hollow-fibre membrane of the present invention;
Accompanying drawing 5 is Electronic Speculum photographs of hollow-fibre membrane vertical section of the present invention;
Accompanying drawing 6 is a kind of cross section Electronic Speculum photographs of the prior art;
Accompanying drawing 7 is the cross section Electronic Speculum photographs of another kind of the prior art.
The specific embodiment
Below by embodiment, and in conjunction with the accompanying drawings, technical scheme of the present invention is made specific description.
Embodiment 1: the trade mark of selecting for use Shanghai three Ai Fu Materials Co., Ltd to produce is FR904 (weight average molecular weight 800,000 dalton's) a polyvinylidene fluoride resin 18% (wt), and inherent viscosity is 1.95.(PVP) polyvinylpyrrolidone K-30 (weight average molecular weight 45000 dalton) 12.5% (wt) that Shanghai Sheng Pu new material Co., Ltd produces; the polyethylene glycol PEG-600 of Japan's import is 8% (wt); the Tween-80 of Japan's import is 1.5% (wt); lithium nitrate 0.5% (wt); the N-methyl pyrrolidone 29.5% (wt) that Shanghai chemical reagents corporation produces; the dimethylacetylamide 30% (wt) that BASF AG produces; above-mentioned substance (referring to table 1) is dropped in the dissolution kettle by order; under 85 ℃ of temperature, stir; make even preparation liquid; deaeration circulates in 80 ℃ of temperature stills; keep 80 ℃ of preparation liquids to pass through two sleeve pipe spinning heads, the compound support liquid in the shower nozzle central tube sprays.Described compound support liquid is the solvent 50% (wt) by vinylidene, alcohols and polyalcohols 8% (wt), and surfactant 5% (wt) and deionized water 37% (wt) constitute.The preparation liquid of ejection is through about 0.1 second evaporation, enter in the one-level immersion fluid of solvent of 40% (wt) polyvinylidene fluoride resin 4 seconds, enter in the secondary coagulant liquid of polyvinylidene fluoride resin solvent of 5% (wt) precipitation by traction 60 seconds, pass through rinsing and hydrophilic treated again, deliver to and collect on the wheel.Described hydrophilizing agent is by glycerine 50% (wt), and hydroxypropyl cellulose 0.1% (wt) and triton type emulsifying agent 1.0% (wt) are formed.The doughnut external pressure milipore filter section of gained is respectively extexine 1 from outside to inside thus, spongelike structure supporting layer 2, endosexine 3, be two cortex constructions (referring to accompanying drawing 1, accompanying drawing 2, accompanying drawing 3, accompanying drawing 4 and accompanying drawing 5), the film external diameter is 1.25mm, internal diameter is 0.65mm, porosity 75%, pure water flux 450L/m
2.h.25 ℃ .1bar, nominal average pore size 0.045 μ m, film compression strength is 0.5Mpa.
Parameter such as various materials and consumption is respectively referring to table 1, table 2, table 3 and table 4 to the embodiment 10 to implement 2 examples, and other parts are referring to embodiment 1.
Embodiment 11: the trade mark of selecting for use Shanghai three Ai Fu Materials Co., Ltd to produce is FR904 (weight average molecular weight 800,000 dalton's) a polyvinylidene fluoride resin 18% (wt); (PVP) polyvinylpyrrolidone (weight average molecular weight 45000 dalton) 12.0% (wt) that Shanghai Sheng Pu new material Co., Ltd produces; (weight average molecular weight 1,000,000 dalton) polyvinylpyrrolidone 0.5% that Jin Long chemical plant, Nanjing produces; the polyethylene glycol PEG-600 8% (wt) of Japan's import; the Tween-80 1.5% (wt) of Japan's import; lithium nitrate 0.5% (wt); the N-methyl pyrrolidone 29.5% (wt) that Shanghai chemical reagents corporation produces; the dimethylacetylamide 30% (wt) that BASF AG produces; above-mentioned substance is dropped in the dissolution kettle by order; under 85 ℃ of temperature, stir; make even preparation liquid; deaeration circulates in 80 ℃ of temperature stills; keep 80 ℃ of preparation liquids to pass through two sleeve pipe spinning heads; compound support liquid in the shower nozzle central tube sprays; through about 0.05 second evaporation; enter in the one-level immersion fluid of polyvinylidene fluoride resin solvent of 45% (wt) 3 seconds; enter in the polyvinylidene fluoride resin solvent secondary coagulant liquid of 10% (wt) precipitation by traction 80 seconds; pass through rinsing and hydrophilic treated again, deliver to and collect on the wheel.The doughnut external pressure milipore filter section of gained is respectively extexine 1 from outside to inside, spongelike structure supporting layer 2, endosexine 3, be two cortex constructions (referring to accompanying drawing 1, accompanying drawing 2, accompanying drawing 3, accompanying drawing 4 and accompanying drawing 5), the film external diameter is 1.25mm, internal diameter is 0.65mm, porosity 78%, pure water flux 450L/m
2.h.25 ℃ .1bar, nominal average pore size 0.045 μ m, film compression strength is 0.5Mpa.
Embodiment 12: selecting for use Japanese Wu Yu chemical industrial company to produce the trade mark is the polyvinylidene fluoride resin 20.5% (wt) of 1700 (weight average molecular weight 500,000 dalton), (weight average molecular weight 45000 Dao Er) polyvinylpyrrolidone 9.5% (wt) that Shanghai Sheng Pu new material Co., Ltd produces, polyethylene glycol PEG-400 (Japanese import) 12% (wt), emulsifying agent 1.0% (wt), chemical reagent lithium chloride 0.5% (wt), the dimethylacetylamide 56.5% (wt) that BASF AG produces, above-mentioned substance is pressed embodiment 1 method system film, through about 0.02 second evaporation, enter in the one-level immersion fluid of polyvinylidene fluoride resin solvent of 60% (wt) 1.5 seconds, enter in the polyvinylidene fluoride resin solvent secondary coagulant liquid of 30% (wt) precipitation by traction 30 seconds, the two cortexes of the doughnut external pressure milipore filter of gained, the film section presents spongelike structure, the film external diameter is 1.25mm, internal diameter is 0.65mm, porosity 80%, pure water flux 750L/m
2.h.25 ℃ .1bar, nominal average pore size 0.06 μ m, film compression strength 〉=0.5Mpa.
Embodiment 13: selecting for use SOLVAY company to produce the trade mark is the Kynoar resin 20.5% (wt) of SOLEF6020 (weight average molecular weight is 400,000 dalton), (weight average molecular weight 45000 dalton) polyvinylpyrrolidone 10.5% (wt) that Shanghai Sheng Pu new material Co., Ltd produces, polyethylene glycol PEG-300 (Japanese import) 10% (wt), polyvinyl alcohol 1.5% (wt), 20% sodium acetate aqueous solution 5% (wt), the solvent dimethylacetylamide 52.5% (wt) that BASF AG produces is pressed embodiment 1 method system film with above-mentioned substance.Through about 0.2 second evaporation, enter in the one-level immersion fluid of polyvinylidene fluoride resin solvent of 80% (wt) 2.0 seconds, enter in the polyvinylidene fluoride resin solvent secondary coagulant liquid of 20% (wt) precipitation by traction 4 seconds, the two cortexes of the doughnut external pressure milipore filter of gained, the film section presents sponge structure, film external diameter 1.25mm, internal diameter 0.65mm, porosity 80%, pure water flux 460L/m
2.h.25 ℃ .1bar, nominal average pore size 0.055 μ m, film compression strength is 0.5Mpa.
Embodiment 14: the trade mark of selecting for use SOLVAY company to produce is SOLEF6030 (weight average molecular weight 500,000 dalton's) a Kynoar resin 19.0% (wt), the polyvinylpyrrolidone (K-17) 9.0% (wt) that Shanghai Sheng Pu new material Co., Ltd produces, the polyethylene glycol PEG-300 11% (wt) of Japan's import, polyvinyl alcohol 4% (wt), the Tween-80 2.0% (wt) of Japan's import, chemical pure triethyl phosphate 5% (wt), the dimethyl formamide 50% (wt) of BASF AG, to go up material by example 1 method system film, through about 0.15 second evaporation, enter in the one-level immersion fluid of polyvinylidene fluoride resin solvent of 50% (wt) 2.5 seconds, enter in the polyvinylidene fluoride resin solvent secondary coagulant liquid of 25% (wt) precipitation by traction 120 seconds, the two cortexes of the doughnut external pressure milipore filter of gained, the film section presents sponge structure, film external diameter 1.2mm, internal diameter 0.6mm, porosity 75%, pure water flux 450L/m
2.h.25 ℃ .1bar, nominal average pore size 0.015 μ m, film compression strength is 0.5Mpa.
Table 1: preparation liquid prescription among the present invention
Table 2: the prescription of hydrophilizing agent among the present invention
Table 3: the prescription of compound support liquid among the present invention
Table 4: the filming performance among the present invention
Claims (13)
1. one kind is immersed the method for making that gel method spins external-compression type Kynoar hollow-fibre membrane, it is characterized in that it is to finish through following step:
A, following substances is added in the reactor, at a certain temperature, dissolving is stirred and is made preparation liquid:
Kynoar 18-25% (weight ratio)
Organic additive 22-25% (weight ratio)
Inorganic additive 0.5-5.0% (weight ratio)
Solvent 59.5-45.0% (weight ratio);
B, above-mentioned preparation liquid together spray with placing the compound support liquid in the shower nozzle central tube by two sleeve pipe shower nozzles;
C, after rapid evaporation, described preparation liquid together enters in the one-level immersion fluid with compound support liquid in the pipe, then enters in the secondary coagulant liquid and precipitates, and carries out two-stage phase-separating coagulations;
D, after rinsing, this phase inversion membrane is carried out hydrophilic treated;
E, the integrated external-compression type hollow-fibre membrane of making two cortexes, complete spongy supporting layer continuously.
2. the method for making of immersing gel method spinning external-compression type Kynoar hollow-fibre membrane according to claim 1, it is characterized in that described organic additive is meant two or more in polyvinylpyrrolidone class, polyethylene glycols, polyvinyl alcohol, emulsifying agent Tween, the triton class emulsifying agent, when organic additive surpassed two kinds, the total amount addition was constant.
3. the method for making of immersing gel method spinning external-compression type Kynoar hollow-fibre membrane according to claim 1, it is characterized in that described inorganic additive is meant one or both in lithium chloride, lithium nitrate, sodium acetate, the sodium nitrate solution, when organic additive surpassed two kinds, the total amount addition was constant.
4. the method for making of immersing gel method spinning external-compression type Kynoar hollow-fibre membrane according to claim 1, it is characterized in that described solvent is meant one or both in N-methyl pyrrolidone, dimethyl formamide, dimethylacetylamide, dimethyl sulfoxide (DMSO), the triethyl phosphate, when organic additive surpassed two kinds, the total amount addition was constant.
5. the method for making of immersing gel method spinning external-compression type Kynoar hollow-fibre membrane according to claim 1, it is characterized in that described compound support liquid is meant solvent 10-80% (weight ratio), alcohols and polyalcohols 5-30% (weight ratio), the surfactant 0.5-5% (weight ratio) of Kynoar, all the other are deionized water.
6. the method for making of immersing gel method spinning external-compression type Kynoar hollow-fibre membrane according to claim 1, the inherent viscosity that it is characterized in that described Kynoar is 1.65-2.00, weight average molecular weight is 400,000 to 800,000 dalton.
7. the method for making of immersing gel method spinning external-compression type Kynoar hollow-fibre membrane according to claim 1, the optimal value that it is characterized in that the inherent viscosity of described Kynoar is 1.75-1.85, weight average molecular weight is 500,000-700,000 dalton; When Kynoar surpasses when a kind of, the total amount addition is constant.
8. according to claim 1 or 2 or 3 or 4 or 5 or the 6 or 7 described method for makings of immersing gel method spinning external-compression type Kynoar hollow-fibre membrane, it is characterized in that described organic additive can be polyvinylpyrrolidone (PVP), its weight average molecular weight range is 11000-100 ten thousand dalton; The ratio of described organic additive is 22%-25% (weight ratio).
9. according to claim 1 or 2 or 3 or 4 or 5 or the 6 or 7 described method for makings of immersing gel method spinning external-compression type Kynoar hollow-fibre membrane, it is characterized in that the evaporation time before the described phase-splitting gel is 0.02 second-0.2 second; The component of described one-level immersion fluid is that the solvent of Kynoar is 40-80% (weight ratio), and gel time is 1.5 seconds-4.0 seconds; The component of secondary coagulant liquid is that the solvent of Kynoar is 5-30% (weight ratio), and gel time is 4.0 seconds-120 seconds.
10. according to claim 1 or 2 or 3 or 4 or 5 or the 6 or 7 described method for makings of immersing gel method spinning external-compression type Kynoar hollow-fibre membrane, it is characterized in that described hydrophilizing agent is one or more in the triton type emulsifying agent of hydroxypropyl cellulose, 0.5-5% (weight ratio) of glycerine, the 0.05-5% (weight ratio) of 10-80% (weight ratio).
11. the method for making of immersing gel method spinning external-compression type Kynoar hollow-fibre membrane according to claim 8 is characterized in that described hydrophilizing agent is one or more in the triton type emulsifying agent of hydroxypropyl cellulose, 0.5-5% (weight ratio) of glycerine, the 0.05-5% (weight ratio) of 10-80% (weight ratio).
12. according to claim 1 or 2 or 3 or 4 or 5 or the 6 or 7 described method for making resulting products that immerse gel method spinning external-compression type Kynoar hollow-fibre membrane, it is characterized in that described hollow-fibre membrane is an inside and outside pair of cortex construction, described exodermis is than endodermis densification, the supporter of film section therebetween is full spongelike structure, and the milipore filter nominal pore size is 0.01-0.06um, and the pure water permeation flux is 150-800L/m
2.h.25 ℃ .1bar, porosity 70-85%, tunica fibrosa resistance to compression 〉=0.5Mpa.
13. the method for making resulting product that immerses gel method spinning external-compression type Kynoar hollow-fibre membrane according to claim 8, it is characterized in that described hollow-fibre membrane is an inside and outside pair of cortex construction, described exodermis is than endodermis densification, the supporter of film section therebetween is full spongelike structure, and the milipore filter nominal pore size is 0.01-0.06um, and the pure water permeation flux is 150-800L/m
2.h.25 ℃ .1bar, porosity 70-85%, tunica fibrosa resistance to compression 〉=0.5Mpa.
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