CN106731901B - The preparation method of polyester fiber braiding tube enhancement type composite hollow fibre forward osmosis membrane - Google Patents
The preparation method of polyester fiber braiding tube enhancement type composite hollow fibre forward osmosis membrane Download PDFInfo
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- CN106731901B CN106731901B CN201710039263.7A CN201710039263A CN106731901B CN 106731901 B CN106731901 B CN 106731901B CN 201710039263 A CN201710039263 A CN 201710039263A CN 106731901 B CN106731901 B CN 106731901B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/06—Organic material
- B01D71/48—Polyesters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/002—Forward osmosis or direct osmosis
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
- B01D69/02—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor characterised by their properties
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
- B01D69/08—Hollow fibre membranes
- B01D69/087—Details relating to the spinning process
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
- B01D69/12—Composite membranes; Ultra-thin membranes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2325/00—Details relating to properties of membranes
- B01D2325/24—Mechanical properties, e.g. strength
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2325/00—Details relating to properties of membranes
- B01D2325/30—Chemical resistance
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2325/00—Details relating to properties of membranes
- B01D2325/36—Hydrophilic membranes
Abstract
The invention discloses a kind of preparation methods of polyester fiber braiding tube enhancement type composite hollow fibre forward osmosis membrane, comprising: polymer, organic additive, inorganic additive and organic solvent are proportionally configured to homogeneous casting solution；Casting solution is evenly applied in polyester fiber braiding pipe outer wall and its internal gutter, producing inner external wall film coated woven tube is obtained；Overlay film woven tube enters inversion of phases film forming in coagulating bath behind certain air residence time；Just film forming is first impregnated the remaining organic solvent of removal in deionized water and is impregnated in hot bath, takes out and dries after finally impregnating in glycerin solution, and polyester fiber is made and weaves tube enhancement type composite hollow fibre forward osmosis membrane.One step of polymeric casting film liquid is coated on woven tube inside and outside wall using immersion precipitation phase inversion process and obtains high-strength composite doughnut forward osmosis membrane by the present invention, and filming technology is simple；Organic and inorganic water flux, selectivity, hydrophily, stability and the service life that film-forming method is blended and improves film.
Description
Technical field
The invention belongs to field of membrane preparation, and in particular to a kind of polyester fiber braiding tube enhancement type composite hollow fibre just seeps
Permeable membrane and preparation method thereof.
Background technique
Membrane separation technique is quickly grown in recent years, in clean water treatment, wastewater treatment and reuse and Treatment of Industrial Water field
It is widely used.Positive infiltration technology (FO) has in sewage treatment and recycling very big as a kind of membrane separation technique of green
Application potential.Positive infiltration refers to water from the mistake compared with Hyposmolality side by permoselective membrane flow direction compared with hyperosmosis side
Journey.Positive infiltration technology has many advantages, such as that low energy consumption, fouling membrane is small, the high extensive pass by domestic and foreign scholars of the water rate of recovery because of it
Note.
Exploitation to high-performance forward osmosis membrane material is always the research hotspot in positive infiltration field, and ideal forward osmosis membrane is answered
Have that rejection is high, water flux is big, good hydrophilic property, thickness is thin, porosity is high, high mechanical strength, while also needing to have corrosion-resistant
The features such as ability is relatively strong and application range is wider.The masking technique that organic matter and inorganic matter are blended can increase compound film strength
And the service life, improve hydrophilicity, improve the water flux of film, while making film that there is good resistance tocrocking.Currently, having developed
Forward osmosis membrane component out includes plate and hollow fiber type.However, plate film component has, film bulk density is small, is not easy
Cleaning, flow regime bad the disadvantages of easily causing concentration polarization more serious.Hollow fiber type is mostly without the hollow of supporting layer
Tunica fibrosa has the shortcomings that mechanical strength is low, contamination resistance is poor.Beijing Ege Technology Co., Ltd.
(CN205109419U, CN105126654A) is prepared for inner support type doughnut forward osmosis membrane, and this method is only in support tube
Surface is prepared for active layer by interfacial polymerization, and the cohesive force deficiency between active layer and supporting layer cause film be easily layered and
Deformation, and composite membrane is easily oxidized, and film properties is caused to reduce, reduced service life, pollution aggravation.This seminar passes through a leaching one
Roll process is prepared for high-intensitive, high anti-pollution using the surfaces externally and internally that polymeric casting film liquid is coated to PET woven tube is coated twice
Metachromia and high cutoff performance composite hollow fibre ultrafiltration membrane.This method needs to coat twice, impregnates woven tube process in casting solution
Middle coat thickness is difficult to control and influences the secondary coating effect of casting solution, causes film thickness to increase, which is not suitable for just
The preparation of permeable membrane, in addition the preparation process is complicated, equipment requirement is not high, at high cost, easy to operate.
Based on this, it is desirable to provide a kind of existing positive permeable hollow fibers film-strength of solution is low, easy to pollute, service life is short,
The new way for the problems such as inner support type hollow-fibre membrane is easily layered, performance is unstable, and filming technology complexity is not easy to control.Also,
The invention of polyester fiber woven tube/polymer composite hollow fibre forward osmosis membrane is prepared using phase inversion there is not yet report.
Summary of the invention
The purpose of the present invention is for existing positive permeable hollow fibers film-strength is low, easy to pollute, service life is short, inner support
Type hollow-fibre membrane activation separating layer is easily-deformable, fall off the problems such as caused film properties are unstable, and filming technology is complicated, proposes
A kind of polyester fiber braiding tube enhancement type composite hollow fibre forward osmosis membrane and preparation method thereof.
The present invention provides a kind of preparation method of polyester fiber braiding tube enhancement type composite hollow fibre forward osmosis membrane, packets
Include following steps:
1) inorganic additive that mass ratio is 1-3% first the preparation of casting solution: is added to the organic solvent of 69-83%
In obtain organic solution, when one section of ultrasonic disperse after, the organic additive of the polymer of 14-20%, 2-8% are added to
It states in organic solution, stirs, vacuum defoamation obtains homogeneous casting solution；
2) woven tube is producing inner external wall film coated: homogeneous casting solution is squeezed under 0.05-0.2Mpa nitrogen pressure by gear pump
In round spinning appts, control casting solution enters woven tube internal pressure, casting solution is evenly applied to braiding pipe outer wall, simultaneously
Into in internal gutter, producing inner external wall film coated woven tube hollow fiber film thread is obtained；
3) just film forming is formed: under wire winding device driving, producing inner external wall film coated woven tube is behind the air residence time 5-30s
It forms a film into inversion of phases in outer coagulating bath；
4) film wire post-processes: the hollow-fibre membrane that step 3) obtains being impregnated in deionized water and goes residue in membrane removal for 24 hours
Organic solvent, after film wire is put into 60-90 DEG C of hot bath and impregnates 0.5-4h, being finally putting into volumetric concentration is 10-40%
6-12h is impregnated in glycerin solution, preservation is dried after taking-up, that is, FDY and DTY polyester PET fiber or PET/ is prepared
PBT fiber blend weaves tube enhancement type doughnut forward osmosis membrane.
Further, in step 1), after organic solvent is added in inorganic additive, the ultrasonic disperse time is 30min-2h.
Further, 12-24h is stirred under the conditions of 25-60 DEG C, vacuum defoamation 10-36h at 25-60 DEG C.
Further, the inorganic additive include but is not limited to carbon nanotube, sulfonation titanium dioxide, nano silica or
The mixture of one or more of zinc chloride.
Further, sulfonation titanium dioxide is made by the following method: 1 part of titanium dioxide powder is added to 15 parts of 1mol/L
In the mixed solution of sulfuric acid solution and 20 parts of methanol, acquired solution is dried in vacuo 48h under the conditions of 120 DEG C by ultrasonic disperse 2h
Obtain sulfonation titanium dioxide.
Further, the organic solvent includes but is not limited to dimethyl acetamide DMAc, dimethylformamide DMF, diformazan
The mixing of one of base sulfoxide DMSO, N-methyl pyrrolidones NMP, 1,4- dioxane or acetone or above-mentioned several solvents
Object.
Further, the polymer is cellulose acetate CA, Triafol T CTA, polyacrylonitrile (PAN) or polyphenyl and miaow
The mixture of one or more of azoles PBI.
Further, the organic additive includes but is not limited to polyvinylpyrrolidone PVP, PVAC polyvinylalcohol, poly- second two
The mixture of one or more of alcohol PEG, triethylene glycol TEG or glycerine.
Further, the woven tube is FDY and DTY polyester PET fiber or PET/PBT fiber blend woven tube, outside
Diameter is in 1.0-2.0mm, and internal diameter is in 0.5-1.2mm.
Further, the organic solution that step 3) the outer coagulating bath is deionized water or mass percent is 5-40%；Its
Middle organic solution is dimethyl acetamide DMAc, dimethylformamide DMF, dimethyl sulfoxide DMSO, N-methyl pyrrolidones
The aqueous solution of the mixture of one of NMP, 1,4- dioxane or acetone or above-mentioned several solvents.
It compared with, advantages of the present invention and has the beneficial effect that compared with prior art
The woven tube that the present invention selects FDY and DTY polyester PET fiber or PET/PBT fiber blend to weave, in conjunction with
Blended obtained woven tube outer fiber beam is loose, fluffy, and the smooth closely knit structure feature of inner wall is turned by immersion precipitation phase
One step of casting solution is evenly applied in the outer wall and internal gutter of woven tube by change method, and casting solution is tightly combined with woven tube, solution
Having determined, positive permeable hollow fibers film-strength is low, composite membrane separating layer is easy to fall off, the problem of multiprogram filming technology complexity；While by
In support tube there are compound forward osmosis membrane mechanical strengths to significantly improve；It is film-made using the organic and inorganic step that inversion of phases is blended
Method can be easily controlled film coat thickness, suitable for the preparation of forward osmosis membrane, improve the hydrophilic of compound forward osmosis membrane
Property, water flux, stability and antifouling property, be prepared for the excellent doughnut forward osmosis membrane of selectivity.
And the filming technology is simple, equipment requirement is low.The invention equipment therefor is simple and fast, it is easily operated, practical,
It is at low cost, it is easy to carry out large-scale industrial production.
Specific embodiment
The present invention is further detailed below in conjunction with specific example, but the example is not constituted to the present invention
Limitation.
The preparation method of polyester fiber braiding tube enhancement type composite hollow fibre forward osmosis membrane of the present invention, comprising:
1) preparation of casting solution: first by mass ratio be 1-3% inorganic additive (carbon nanotube, is received sulfonation titanium dioxide
The mixture of rice silica or one or more of zinc chloride) it is added to the organic solvent (dimethylacetamide of 69-83%
In amine DMAc, dimethylformamide DMF, dimethyl sulfoxide DMSO, N-methyl pyrrolidones NMP, 1,4- dioxane or acetone
One kind or above-mentioned several solvents mixture) in obtain organic solution, after ultrasonic disperse 30min-2h, by the poly- of 14-20%
Conjunction object be (one or more of cellulose acetate CA, Triafol T CTA, polyacrylonitrile (PAN) or polybenzimidazoles PBI's
Mixture), organic additive (polyvinylpyrrolidone PVP, PVAC polyvinylalcohol, the polyethylene glycol PEG, triethylene glycol of 2-8%
The mixture of one or more of TEG or glycerine) it is added in above-mentioned organic solution, 12- is stirred under the conditions of 25-60 DEG C
For 24 hours, vacuum defoamation 10-36h at 25-60 DEG C, obtains homogeneous casting solution.
Wherein inorganic additive sulfonation titanium dioxide is made by the following method:
1 part of titanium dioxide powder is added in the mixed solution of 15 parts of 1mol/L sulfuric acid solutions and 20 parts of methanol, ultrasound
Disperse 2h, acquired solution is dried in vacuo to 48h under the conditions of 120 DEG C and obtains sulfonation titanium dioxide.
2) woven tube is producing inner external wall film coated:
Woven tube is FDY and DTY polyester PET fiber or PET/PBT fiber blend woven tube, outer diameter in 1.0-2.0mm,
Internal diameter is in 0.5-1.2mm.FDY has outside in conjunction with the woven tube that DTY polyester PET fiber blend obtains the characteristics of two kinds of materials
Fibre bundle is loose, fluffy, the smooth closely knit structure feature of inner wall.And the woven tube that PET/PBT fiber blend obtains can protect
Stay PET material rigidly indeformable advantage, simultaneously as PBT it is filametntary exist make woven tube have certain telescopic resilience, compared with
Big porosity and water imbibition.Pressure is controlled in casting solution coating procedure makes a part of casting solution enter woven tube internal gutter
Middle first to occur mutually to separate solidification, casting solution is combined closely with woven tube, while casting solution is penetrated further into be hindered and avoided
Casting solution block woven tube inside, thus obtain inside and outside wall uniformly coat, coat and woven tube it is compact enhanced multiple
Close film.
Homogeneous casting solution is squeezed into round spinning appts under 0.05-0.2Mpa nitrogen pressure by gear pump, is controlled
Casting solution enters woven tube internal pressure, casting solution is evenly applied to braiding pipe outer wall, while entering in internal gutter, obtained
Producing inner external wall film coated woven tube hollow fiber film thread.
3) just film forming is formed: under wire winding device driving, producing inner external wall film coated woven tube is behind the air residence time 5-30s
It forms a film into inversion of phases in outer coagulating bath；The organic solution that outer coagulating bath is deionized water or mass percent is 5-40%；Its
Middle organic solution is dimethyl acetamide DMAc, dimethylformamide DMF, dimethyl sulfoxide DMSO, N-methyl pyrrolidones
The aqueous solution of the mixture of one of NMP, 1,4- dioxane or acetone or above-mentioned several solvents.
4) film wire post-processes: the hollow-fibre membrane that step 3) obtains being impregnated in deionized water and goes residue in membrane removal for 24 hours
Organic solvent, after film wire is put into 60-90 DEG C of hot bath and impregnates 0.5-4h, being finally putting into volumetric concentration is 10-40%
6-12h is impregnated in glycerin solution, preservation is dried after taking-up, that is, FDY and DTY polyester PET fiber or PET/ is prepared
PBT fiber blend weaves tube enhancement type doughnut forward osmosis membrane.
Further illustrate the present invention combined with specific embodiments below.
Embodiment 1:
By 14% cellulose acetate CA, 6% polyvinylpyrrolidone is added to 1% carbon nanotube of ultrasonic disperse 30min
It is mixed in 45% acetone+34%1, the in the mixed solvent of 4- dioxane, the stirring and dissolving 12h at 60 DEG C, vacuum is de- at 40 DEG C
12h is steeped, homogeneous casting solution is obtained.
Casting solution is squeezed into round spinning appts by gear pump under 0.1Mpa nitrogen pressure, is evenly applied to woven tube
In outer wall and internal gutter, just immersed behind the air residence time 10s at overlay film hollow fiber film thread in 0 DEG C of deionized water into
Row inversion of phases film forming.Selected woven tube is the woven tube that FDY and DTY polyester PET fiber blend obtain, outer diameter 1.8mm, internal diameter
1.2mm。
Obtained film wire is impregnated in deionized water and removes remaining organic solvent in membrane removal for 24 hours, after film wire is put into 60
DEG C hot bath in impregnate 0.5h, be finally putting into volumetric concentration be 25% glycerin solution in impregnate 6h, guarantor is dried after taking-up
It deposits, that is, braiding tube enhancement type doughnut forward osmosis membrane is prepared.
When using 1mol/L NaCl solution as liquid is drawn, prepared forward osmosis membrane water flux is in the present embodiment
10.97L/m2H, salt back-mixing flux are 5.37g/m2·h.Modified composite membrane tensile strength is high, has exceeded in laboratory test
The test scope (5000CN ± 0.5%) of empty fiber membrane tensile strength tester HD021NS.
Embodiment 2:
By 7% cellulose acetate CA+7% Triafol T CTA, 2% PVAC polyvinylalcohol is added to ultrasonic disperse
The 1% sulfonation titanium dioxide of 60min is mixed in 83%1,4- dioxane, the stirring and dissolving 16h at 40 DEG C, vacuum at 60 DEG C
Deaeration 10h obtains homogeneous casting solution.
Casting solution is squeezed into round spinning appts by gear pump under 0.2Mpa nitrogen pressure, is evenly applied to woven tube
In outer wall and internal gutter, 0 DEG C of 25% dimethyl second is just immersed behind the air residence time 5s at overlay film hollow fiber film thread
Inversion of phases film forming is carried out in amide DMAc aqueous solution.Selected woven tube is the woven tube that PET/PBT fiber blend obtains, outer diameter
1.0mm, internal diameter 0.5mm.
Obtained film wire is impregnated in deionized water and removes remaining organic solvent in membrane removal for 24 hours, after film wire is put into 80
DEG C hot bath in impregnate 1h, be finally putting into volumetric concentration be 10% glycerin solution in impregnate 10h, guarantor is dried after taking-up
It deposits, that is, braiding tube enhancement type doughnut forward osmosis membrane is prepared.
When using 1mol/L NaCl solution as liquid is drawn, prepared forward osmosis membrane water flux is in the present embodiment
12.05L/m2H, salt back-mixing flux are 5.86g/m2·h.Modified composite membrane tensile strength is high, has exceeded in laboratory test
The test scope (5000CN ± 0.5%) of empty fiber membrane tensile strength tester HD021NS.
Embodiment 3:
By 20% poly- benzopyrazoles PBI ,+6% polyethylene glycol of 2% polyvinylpyrrolidone is added to ultrasonic disperse 2h's
3% nano silica is mixed in 69% dimethyl acetamide, at 25 DEG C stirring and dissolving for 24 hours, vacuum defoamation at 25 DEG C
36h obtains homogeneous casting solution.
Casting solution is squeezed into round spinning appts by gear pump under 0.05Mpa nitrogen pressure, is evenly applied to weave
In pipe outer wall and internal gutter, 0 DEG C of 40% dimethyl is just immersed behind the air residence time 30s at overlay film hollow fiber film thread
Inversion of phases film forming is carried out in formyl amine aqueous solution.Selected woven tube is the woven tube that PET/PBT fiber blend obtains, outer diameter
2.0mm, internal diameter 0.6mm.
Obtained film wire is impregnated in deionized water and removes remaining organic solvent in membrane removal for 24 hours, after film wire is put into 90
DEG C hot bath in impregnate 4h, be finally putting into volumetric concentration be 40% glycerin solution in impregnate 12h, guarantor is dried after taking-up
It deposits, that is, braiding tube enhancement type doughnut forward osmosis membrane is prepared.
When using 1mol/L NaCl solution as liquid is drawn, prepared forward osmosis membrane water flux is in the present embodiment
12.88L/m2H, salt back-mixing flux are 5.98g/m2·h.Modified composite membrane tensile strength is high, has exceeded in laboratory test
The test scope (5000CN ± 0.5%) of the tester HD021NS of empty fiber membrane tensile strength.
From above-described embodiment as can be seen that composite hollow fibre forward osmosis membrane prepared by the present invention shows higher water
Flux and lower salt back-mixing flux, water flux are not less than 10.97L/m2H, salt back-mixing flux are not higher than 5.98g/m2H,
Therefore the composite membrane has excellent selectivity；One step film preparation is simple for process, convenient for control, composite membrane mechanical strength
It greatly, is a kind of good polyester fiber braiding tube enhancement type composite hollow fibre forward osmosis membrane of processing performance.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by anyone skilled in the art,
It should be covered by the protection scope of the present invention.
Claims (9)
1. a kind of preparation method of polyester fiber braiding tube enhancement type composite hollow fibre forward osmosis membrane, which is characterized in that the party
Method the following steps are included:
1) preparation of casting solution: it is having for 69-83% that the inorganic additive that mass fraction is 1-3%, which is first added to mass fraction,
Obtain organic solution in solvent, ultrasonic disperse for a period of time after, polymer that mass fraction is 14-20%, 2-8% are had
Machine additive is added in above-mentioned organic solution, and stirring, vacuum defoamation obtains homogeneous casting solution；
2) woven tube is producing inner external wall film coated: homogeneous casting solution is squeezed into circle by gear pump under 0.05-0.2Mpa nitrogen pressure
In spinning appts, control casting solution enters the internal pressure of woven tube, and casting solution is evenly applied to braiding pipe outer wall, while into
Enter in internal gutter, obtains producing inner external wall film coated woven tube hollow fiber film thread；
3) just film forming is formed: under wire winding device driving, producing inner external wall film coated woven tube enters behind the air residence time 5-30s
Inversion of phases forms a film in outer coagulating bath；
4) film wire post-processes: the hollow-fibre membrane that step 3) obtains being impregnated in deionized water and goes remaining in membrane removal to have for 24 hours
Solvent, after film wire is put into 60-90 DEG C of hot bath and impregnates 0.5-4h, being finally putting into volumetric concentration is 10-40% the third three
6-12h is impregnated in alcohol solution, preservation is dried after taking-up, that is, FDY and DTY polyester PET fiber is prepared or PET/PBT is fine
Tie up blending woven tube enhancement type doughnut forward osmosis membrane；
The polymer is one in cellulose acetate CA, Triafol T CTA, polyacrylonitrile (PAN) or polybenzimidazoles PBI
Kind or several mixtures；
The woven tube is FDY and DTY polyester PET fiber or PET/PBT fiber blend woven tube.
2. the method according to claim 1, wherein after organic solvent is added in inorganic additive, surpassing in step 1)
Sound jitter time is 30min-2h.
3. the method according to claim 1, wherein the casting solution of step 1) configuration stirs under the conditions of 25-60 DEG C
12-24h is mixed, vacuum defoamation 10-36h at 25-60 DEG C, to obtain homogeneous casting solution.
4. the method according to claim 1, wherein the inorganic additive include but is not limited to carbon nanotube,
The mixture of one or more of sulfonation titanium dioxide, nano silica or zinc chloride.
5. according to the method described in claim 4, it is characterized in that, sulfonation titanium dioxide is made by the following method: by 1 part two
Titanium oxide powder is added in the mixed solution of 15 parts of 1mol/L sulfuric acid solutions and 20 parts of methanol, ultrasonic disperse 2h, and gained is molten
Liquid is dried in vacuo 48h under the conditions of 120 DEG C and obtains sulfonation titanium dioxide.
6. the method according to claim 1, wherein the organic solvent includes but is not limited to dimethyl acetamide
In DMAc, dimethylformamide DMF, dimethyl sulfoxide DMSO, N-methyl pyrrolidones NMP, 1,4- dioxane or acetone
A kind of mixture of or above-mentioned several solvents.
7. the method according to claim 1, wherein the organic additive includes but is not limited to polyvinyl pyrrole
The mixture of one or more of alkanone PVP, PVAC polyvinylalcohol, polyethylene glycol PEG, triethylene glycol TEG or glycerine.
8. internal diameter is in 0.5- the method according to claim 1, wherein the braiding pipe outside diameter is in 1.0-2.0mm
1.2mm。
9. the method according to claim 1, wherein step 3) the outer coagulating bath is deionized water or quality hundred
Score is the organic solution of 5-40%；Wherein organic solution is dimethyl acetamide DMAc, dimethylformamide DMF, dimethyl
The mixture of one of sulfoxide DMSO, N-methyl pyrrolidones NMP, 1,4- dioxane or acetone or above-mentioned several solvents
Aqueous solution.
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| CN107855007A (en) * | 2017-07-13 | 2018-03-30 | 枫科(北京)膜技术有限公司 | A kind of asymmetric forward osmosis membrane and preparation method thereof |
| CN107376668A (en) * | 2017-09-06 | 2017-11-24 | 天津工业大学 | A kind of pressure resistant type doughnut reverse osmosis membrane and preparation method thereof |
| CN108325400B (en) * | 2018-02-09 | 2020-06-05 | 陕西省膜分离技术研究院有限公司 | Preparation method of layer-by-layer self-assembled hollow fiber forward osmosis membrane |
| CN109395591A (en) * | 2018-10-12 | 2019-03-01 | 南京龙源环保有限公司 | A kind of preparation method of reinforced graphite alkene polyvinylidene fluoride microporous film |
| CN109260971A (en) * | 2018-11-19 | 2019-01-25 | 天津工业大学 | A kind of preparation method and applications of hybridized hydrogel filter membrane |
| CN112316736A (en) * | 2020-10-26 | 2021-02-05 | 武汉工程大学 | Method for preparing tubular composite membrane by limited space phase inversion, external coating device, internal coating device and composite membrane |
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| CN106139927A (en) * | 2016-07-28 | 2016-11-23 | 杭州天创环境科技股份有限公司 | A kind of high bond strength braided tube strengthens the preparation method of hollow fiber composite membrane |
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