CN105664740A - Preparation method of nanocellulose composite polysulfone hollow fiber membrane - Google Patents
Preparation method of nanocellulose composite polysulfone hollow fiber membrane Download PDFInfo
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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
- B01D71/66—Polymers having sulfur in the main chain, with or without nitrogen, oxygen or carbon only
- B01D71/68—Polysulfones; Polyethersulfones
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D67/00—Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
- B01D67/0002—Organic membrane manufacture
- B01D67/0009—Organic membrane manufacture by phase separation, sol-gel transition, evaporation or solvent quenching
- B01D67/0011—Casting solutions therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D67/00—Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
- B01D67/0002—Organic membrane manufacture
- B01D67/0009—Organic membrane manufacture by phase separation, sol-gel transition, evaporation or solvent quenching
- B01D67/0016—Coagulation
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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
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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
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/06—Organic material
- B01D71/08—Polysaccharides
- B01D71/10—Cellulose; Modified cellulose
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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
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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
- B01D2325/40—Fibre reinforced membranes
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Abstract
The invention provides a preparation method of a nanocellulose composite polysulfone hollow fiber membrane. The preparation method comprises the steps that a membrane casting solution and a core solution are extruded through an annular spinning head of an immersion precipitated phase inversion spinning device at the same time to form a tubular liquid membrane, wherein the membrane casting solution comprises polysulfone, nanocellulose, polyethylene glycol and sulfonated polysulfone; the tubular liquid membrane passes through an air gap to enter a coagulating bath to be solidified, the tubular liquid membrane is placed in water to be soaked and cleaned, and the nanocellulose composite polysulfone hollow fiber membrane is obtained. The nanocellulose is used as a reinforcing agent and a hydrophilic modifying agent, and the mechanical strength and hydrophilism of the polysulfone membrane are improved; the polyethylene glycol is used as a dispersing agent for the nanocellulose and a hydrophilic modifying agent for the polysulfone membrane, the compatibility between the nanocellulose and polysulfone and the hydrophilism of the polysulfone membrane are improved, and therefore the prepared nanocellulose composite polysulfone hollow fiber membrane has the advantages of being high in strength and good in hydrophilism. In addition, the preparation method is simple in technology.
Description
Technical field
The present invention relates to separation technical field of membrane, the preparation method particularly relating to a kind of nano-cellulose compound ps hollow fiber uf membrane.
Background technology
Polysulfone membrane has excellent heat stability and chemical stability, is widely used in the fields such as hemodialysis, desalinization and water process. The composition of casting solution system and membrance casting condition are the key factors determining polysulfone membrane structure and performance, therefore, by regulating and controlling casting solution concentration, composition, coagulation bath composition, temperature, the air gap and flow velocity etc., it is possible to the polysulfone membrane of the different physical arrangement of preparation and performance. But, polysulfones is the polymeric material of a kind of high hydrophobicity, thus the hydrophilic of polysulfone membrane is poor, when causing polysulfone membrane for the separation of aqueous systems, this separation film vulnerable to pollution, the performance and used life of film is affected.
The hydrophilic improving polysulfone membrane becomes the important measures improving polysulfone membrane antifouling property, and wherein, the blending method adopting blended hydrophilic additive is currently used maximum maximally effective hydrophilic polysulfone membrane preparation method. Such as, application number is the Chinese patent literature preparation method that discloses a kind of ps hollow fiber uf membrane of 201410744351.3, casting solution adds Polyethylene Glycol, and the mass ratio of polysulfones, Polyethylene Glycol and dimethyl acetylamide is 20/35/45, by the optimization to technique in preparation process and parameter, obtain ps hollow fiber uf membrane. Chinese patent CN1158273A and Japan Patent JP-A-300633/1993 etc. disclose the method preparing hydrophilic polysulfone membrane for additive with polyvinylpyrrolidone (PVP). The Polyethylene Glycol of high molecular or high-load and polyvinylpyrrolidone can improve the viscosity of casting solution system, obtain the polysulfone membrane of sponge pore structure, but there is also that film surface quality is poor, intensity is low and the shortcoming such as masking is difficult so that its industrialized production is restricted. Therefore, prepare the hydrophilic polysulfone membrane with high intensity to have broad application prospects.
Nano material is a kind of widely used polymeric additive, has the effect that polymer strength is substantially improved. Such as SiO2、ZrO2It is widely used in the composite modified of polymer separation film Deng inorganic nanoparticles, improves the mechanical strength of film.Nano-cellulose is as a kind of natural nano-material, there is abundance, the characteristic such as cheap, renewable and degradable, also there is the features such as big, the excellent in mechanical performance of specific surface area, as the reinforcing material of polymer, the mechanical performance such as intensity and toughness that polymeric material can be substantially improved. In recent years, with nano-cellulose for compound additive, approved widely in polymeric material field. The preparation method that Chinese patent CN103627016A discloses a kind of holocellulos nano composite membrane, is dispersed in nano-cellulose in Solution of CA-Acetone, and casting film. Polymer body material in this patent is hydrophilic cellulose diacetate, and its structure also has similarity, and therefore the biphase compatibility of this composite membrane is good. The preparation method that Chinese patent CN102604139A also discloses that a kind of nano cellulose composite film, with hydrophilic polyvinyl alcohol for bulk material, after strengthening with nano-cellulose, the hot strength of composite membrane is up to 66.57MPa, and the composite membrane (39.35MPa) being relatively not added with nano-cellulose improves 69.17%. Therefore, nano-cellulose has broad application prospects in environmentally friendly reinforcing material field.
However, it is noteworthy that nano-cellulose is used for the composite strengthening of hydrophilic bulk material at present, and the composite strengthening for hydrophobic bulk material is less. Its reason is in that, directly uses hydrophilic nano-cellulose and hydrophobic polymer body Material cladding, the problem that the Presence of an interface compatibility is poor. Therefore nano-cellulose is easily reunited in polymer body material, it is impossible to realizing dispersed and compound purpose, cause composite structure existing defects, mechanical strength is relatively low, it is impossible to realize the purpose strengthened. If overcoming this problem, nano-cellulose is possible not only to improve the mechanical performance of material, moreover it is possible to improve the hydrophilicity of material.
Summary of the invention
The technical problem to be solved in the present invention is in that the preparation method providing a kind of nano-cellulose compound ps hollow fiber uf membrane, and the ps hollow fiber uf membrane hydrophilic of preparation is good, and mechanical strength is high.
The preparation method that the present invention provides a kind of nano-cellulose compound ps hollow fiber uf membrane, comprise the following steps: by the ring-type spinneret of immersion precipitation inversion of phases device for spinning, casting solution and core liquid are extruded into tubulose liquid film simultaneously, and it is the polysulfones of 13-30:0.1-7:1-8:0.5-5, nano-cellulose, Polyethylene Glycol and SPSF that described casting solution includes mass ratio; Described tubulose liquid film is entered behind the air gap in coagulating bath and solidify, be placed in water soaking and washing, obtain the ps hollow fiber uf membrane of nano-cellulose compound.
Preferably, described casting solution is prepared as follows: be dispersed in dimethyl acetylamide by nano-cellulose, it is subsequently adding polysulfones, Polyethylene Glycol and SPSF, stirring is to forming uniform solution, deaeration, obtaining casting solution, the mass ratio of described polysulfones, nano-cellulose, Polyethylene Glycol and SPSF is 13-30:0.1-7:1-8:0.5-5.
Preferably, described nano-cellulose be dispersed in dimethyl acetylamide adopt process for dispersing be ultrasonic method or homogenizing method.
Preferably, described core liquid is the mixture of dimethyl acetylamide and water.
Preferably, being formed in the step of tubulose liquid film, the flow velocity of casting solution is 10-20g/min.
Preferably, being formed in the step of tubulose liquid film, the flow velocity of core liquid is 10-20ml/min.
Preferably, the length of described nano-cellulose is 30-600nm.
Preferably, the mean molecule quantity of described Polyethylene Glycol is 200-20000.
Preferably, described coagulating bath is water.
Preferably, described the air gap is 0.1-30cm.
The preparation method that the present invention provides a kind of nano-cellulose compound ps hollow fiber uf membrane, comprise the following steps: by the ring-type spinneret of immersion precipitation inversion of phases device for spinning, casting solution and core liquid are extruded into tubulose liquid film simultaneously, and it is the polysulfones of 13-30:0.1-7:1-8:0.5-5, nano-cellulose, Polyethylene Glycol and SPSF that described casting solution includes mass ratio; Described tubulose liquid film is entered behind the air gap in coagulating bath and solidify, be placed in water soaking and washing, obtain the ps hollow fiber uf membrane of nano-cellulose compound. Compared with prior art, the present invention as the reinforcing agent of polysulfone membrane and hydrophilic modifying agent, improves mechanical performance and the hydrophilic of polysulfone membrane using nano-cellulose simultaneously; With Polyethylene Glycol be nano-cellulose dispersant and the hydrophilic modifying agent of polysulfone membrane, improve the hydrophilic of the interface compatibility between hydrophilic cellulose and hydrophobic polysulfones and polysulfone membrane, so that the nano-cellulose compound ps hollow fiber uf membrane of preparation has the mechanical strength of excellence and good hydrophilicity. Preparation method technique provided by the invention is simple, easy to operate.
Detailed description of the invention
In order to be further appreciated by the present invention, below in conjunction with embodiment, the preferred embodiment of the invention is described, but it is to be understood that these describe simply as further illustrating the features and advantages of the present invention, rather than limiting to the claimed invention.
The preparation method that the embodiment of the invention discloses a kind of nano-cellulose compound ps hollow fiber uf membrane, comprise the following steps: casting solution and core liquid are extruded by the ring-type spinneret of immersion precipitation inversion of phases device for spinning simultaneously, forming tubulose liquid film, it is the polysulfones of 13-30:0.1-7:1-8:0.5-5, nano-cellulose, Polyethylene Glycol and SPSF that described casting solution includes mass ratio; Described tubulose liquid film is entered behind the air gap in coagulating bath and solidify, be placed in water soaking and washing, obtain the ps hollow fiber uf membrane of nano-cellulose compound.
The present invention adopts immersion precipitation phase inversion process to prepare hollow-fibre membrane, using nano-cellulose as the reinforcing agent of polysulfone membrane and hydrophilic modifying agent, with Polyethylene Glycol be nano-cellulose dispersant and the hydrophilic modifying agent of polysulfone membrane, improving the compatibility between nano-cellulose and polysulfones, preparation has the hydrophilic ps hollow fiber uf membrane of high intensity.
Preferably, described casting solution is prepared as follows: be dispersed in dimethyl acetylamide by nano-cellulose, it is subsequently adding Polyethylene Glycol, polysulfones and SPSF, stirring is to forming uniform solution, deaeration, obtaining casting solution, the mass ratio of described polysulfones, nano-cellulose, Polyethylene Glycol and SPSF is 13-30:0.1-7:1-8:0.5-5. It is furthermore preferred that the mass ratio of described polysulfones, nano-cellulose, Polyethylene Glycol and SPSF is 14-25:1-7:1-6:2-5, more preferably 14-20:2-7:1-6:2-5. The present invention, by regulating the ratio of each raw material, can significantly regulate membrane structure and performance.
In the preparation process of casting solution, described nano-cellulose is dispersed in dimethyl acetylamide, it is preferred to use process for dispersing be ultrasonic method or homogenizing method.Described core liquid is preferably the mixture of dimethyl acetylamide and water, and wherein, the volume ratio of described dimethyl acetylamide and water is preferably 1:1-10, more preferably 1:1-8, more preferably 1:1-5. Described defoaming method is preferably standing and defoaming method or vacuum defoamation method.
Preferably, being formed in the step of tubulose liquid film, the flow velocity of casting solution is preferably 10-20g/min, more preferably 12-18g/min, more preferably 14-16g/min; The flow velocity of core liquid is preferably 10-20ml/min, more preferably 12-18g/min, more preferably 14-16g/min. The present invention, by regulating the thickness of the flow rate regulation hollow-fibre membrane of casting solution, regulates and controls membrane flux; By regulating the flow velocity of core liquid, play the purpose of internal diameter size and the wall thickness regulating hollow-fibre membrane.
Preferably, the length of described nano-cellulose is preferably 30-600nm, more preferably 100-500nm. The present invention, by regulating the length of nano-cellulose, improves the structure of film, hydrophilic and mechanical strength.
The mean molecule quantity of described Polyethylene Glycol is preferably 200-20000, more preferably 200-10000, more preferably 1000-10000. The present invention, by regulating the molecular weight of Polyethylene Glycol, improves the compatibility of nano-cellulose and polysulfones.
Preferably, described coagulating bath is water, plays good solidification effect.
Preferably, described the air gap is preferably 0.1-30cm, more preferably 1-25cm, more preferably 7-15cm. The present invention, by controlling the distance of the air gap, plays the purpose of the structure of regulation and control film.
From above scheme it can be seen that the present invention has a characteristic that
The invention have the advantages that and beneficial effect:
1, the present invention is with nano-cellulose for additive, can improve mechanical strength and the hydrophilic of polysulfone membrane simultaneously, prepares the hydrophilic ps hollow fiber uf membrane of high intensity, and, method provided by the invention is simple;
2, adopting Polyethylene Glycol is the dispersant of nano-cellulose, can effectively suppress the reunion of nano-cellulose, and strengthens the compatibility of hydrophilic nano-cellulose and hydrophobic polysulfones, improves the combination property of nano-cellulose compound ps hollow fiber uf membrane further.
In order to be further appreciated by the present invention, below in conjunction with embodiment, technical scheme provided by the invention being described in detail, protection scope of the present invention is not limited by the following examples.
Raw material and chemical reagent that the embodiment of the present invention adopts are commercial.
Embodiment 1
The nano-cellulose that length is 80nm is dispersed in dimethyl acetylamide; add polysulfones, Polyethylene Glycol and SPSF; stirring and dissolving is solution uniformly; standing and defoaming, obtaining polysulfones, nano-cellulose, Polyethylene Glycol (molecular weight is 20000) and SPSF mass ratio is the casting solution of 14:7:1:2; Using dimethyl acetylamide and mixed solution that water volume ratio is 1:3 as core liquid. Casting solution and core liquid are extruded into tubulose liquid film by the ring-type spinneret of immersion precipitation inversion of phases device for spinning simultaneously, casting solution flow velocity is 20g/min, core flow velocity is 20ml/min, tubulose liquid film enters to solidify in the coagulating bath of water 24 hours behind the air gap of 7cm and becomes hollow-fibre membrane, clean after 48h through water soaking, obtain the ps hollow fiber uf membrane of nano-cellulose compound.
After the ps hollow fiber uf membrane of above-mentioned nano-cellulose compound is made membrane module, recording water flux is 8000L/m2H, hot strength is 10MPa.
Embodiment 2
The nano-cellulose that length is 200nm is dispersed in dimethyl acetylamide; add polysulfones, Polyethylene Glycol and SPSF; stirring and dissolving is solution uniformly; standing and defoaming, obtaining polysulfones, nano-cellulose, Polyethylene Glycol (molecular weight is 4000) and SPSF mass ratio is the casting solution of 20:2:5:5; Using dimethyl acetylamide and mixed solution that water volume ratio is 1:4 as core liquid. Casting solution and core liquid are extruded into tubulose liquid film by the ring-type spinneret of immersion precipitation inversion of phases device for spinning simultaneously, casting solution flow velocity is 10g/min, core flow velocity is 10ml/min, tubulose liquid film enters to solidify in the coagulating bath of water 24 hours behind the air gap of 15cm and becomes hollow-fibre membrane, clean after 48h through water soaking, obtain the ps hollow fiber uf membrane of nano-cellulose compound.
After the ps hollow fiber uf membrane of above-mentioned nano-cellulose compound is made membrane module, recording water flux is 9000L/m2H, hot strength is 5MPa.
Embodiment 3
The nano-cellulose that length is 100nm is dispersed in dimethyl acetylamide; add polysulfones, Polyethylene Glycol and SPSF; stirring and dissolving is solution uniformly; standing and defoaming, obtaining polysulfones, nano-cellulose, Polyethylene Glycol (molecular weight is 400) and SPSF mass ratio is the casting solution of 25:4:8:3; Using dimethyl acetylamide and mixed solution that water volume ratio is 1:3 as core liquid. Casting solution and core liquid are extruded into tubulose liquid film by the ring-type spinneret of immersion precipitation inversion of phases device for spinning simultaneously, casting solution flow velocity is 10g/min, core flow velocity is 10ml/min, tubulose liquid film enters to solidify in the coagulating bath of water 24 hours behind the air gap of 7cm and becomes hollow-fibre membrane, clean after 48h through water soaking, obtain the ps hollow fiber uf membrane of nano-cellulose compound.
After the ps hollow fiber uf membrane of above-mentioned nano-cellulose compound is made membrane module, recording water flux is 6000L/m2H, hot strength is 7MPa.
Embodiment 4
The nano-cellulose that length is 100nm is dispersed in dimethyl acetylamide; add polysulfones, Polyethylene Glycol and SPSF; stirring and dissolving is solution uniformly; standing and defoaming, obtaining polysulfones, nano-cellulose, Polyethylene Glycol (molecular weight is 10000) and SPSF mass ratio is the casting solution of 12:3:3:0.5; Using dimethyl acetylamide and mixed solution that water volume ratio is 1:1 as core liquid. Casting solution and core liquid are extruded into tubulose liquid film by the ring-type spinneret of immersion precipitation inversion of phases device for spinning simultaneously, casting solution flow velocity is 15g/min, core flow velocity is 15ml/min, tubulose liquid film enters to solidify in the coagulating bath of water 24 hours behind the air gap of 15cm and becomes hollow-fibre membrane, clean after 48h through water soaking, obtain the ps hollow fiber uf membrane of nano-cellulose compound.
After the ps hollow fiber uf membrane of above-mentioned nano-cellulose compound is made membrane module, recording water flux is 4000L/m2H, hot strength is 6MPa.
Embodiment 5
The nano-cellulose that length is 500nm is dispersed in dimethyl acetylamide; add polysulfones, Polyethylene Glycol and SPSF; stirring and dissolving is solution uniformly; standing and defoaming, obtaining polysulfones, nano-cellulose, Polyethylene Glycol (molecular weight is 10000) and SPSF mass ratio is the casting solution of 14:0.1:4:1; Using dimethyl acetylamide and mixed solution that water volume ratio is 1:3 as core liquid. Casting solution and core liquid are extruded into tubulose liquid film by the ring-type spinneret of immersion precipitation inversion of phases device for spinning simultaneously, casting solution flow velocity is 15g/min, core flow velocity is 15ml/min, tubulose liquid film enters to solidify in the coagulating bath of water 24 hours behind the air gap of 30cm and becomes hollow-fibre membrane, clean after 48h through water soaking, obtain the ps hollow fiber uf membrane of nano-cellulose compound.
After the ps hollow fiber uf membrane of above-mentioned nano-cellulose compound is made membrane module, recording water flux is 5500L/m2H, hot strength is 4MPa.
Comparative example 1
Being dissolved in dimethyl acetylamide by polysulfones, Polyethylene Glycol and SPSF, stir into uniform solution, standing and defoaming, obtaining polysulfones, Polyethylene Glycol (molecular weight is 400) and SPSF mass ratio is the casting solution of 14:5:5; Using dimethyl acetylamide and mixed solution that water volume ratio is 1:3 as core liquid. Casting solution and core liquid are extruded into tubulose liquid film by the ring-type spinneret of immersion precipitation inversion of phases device for spinning simultaneously, casting solution flow velocity is 15g/min, core flow velocity is 15ml/min, tubulose liquid film enters to solidify in the coagulating bath of water 24 hours behind the air gap of 7cm and becomes hollow-fibre membrane, clean after 48h through water soaking, obtain the ps hollow fiber uf membrane of nano-cellulose compound.
After the ps hollow fiber uf membrane of above-mentioned nano-cellulose compound is made membrane module, recording water flux is 3000L/m2H, hot strength is 2.5MPa.
Comparative example 2
Being dissolved in dimethyl acetylamide by polysulfones, Polyethylene Glycol and SPSF, stir into uniform solution, standing and defoaming, obtaining polysulfones, Polyethylene Glycol (molecular weight is 10000) and SPSF mass ratio is the casting solution of 25:3:3; Using dimethyl acetylamide and mixed solution that water volume ratio is 1:2 as core liquid. Casting solution and core liquid are extruded into tubulose liquid film by the ring-type spinneret of immersion precipitation inversion of phases device for spinning simultaneously, casting solution flow velocity is 10g/min, core flow velocity is 10ml/min, tubulose liquid film enters to solidify in the coagulating bath of water 24 hours behind the air gap of 25cm and becomes hollow-fibre membrane, clean after 48h through water soaking, obtain the ps hollow fiber uf membrane of nano-cellulose compound.
After the ps hollow fiber uf membrane of above-mentioned nano-cellulose compound is made membrane module, recording water flux is 3600L/m2H, hot strength is 3MPa.
The explanation of above example is only intended to help to understand method and the core concept thereof of the present invention. It should be pointed out that, for those skilled in the art, under the premise without departing from the principles of the invention, it is also possible to the present invention carries out some improvement and modification, these improve and modify in the protection domain also falling into the claims in the present invention.
Claims (10)
1. the preparation method of a nano-cellulose compound ps hollow fiber uf membrane, it is characterised in that comprise the following steps:
By the ring-type spinneret of immersion precipitation inversion of phases device for spinning, casting solution and core liquid are extruded into tubulose liquid film simultaneously, and it is the polysulfones of 13-30:0.1-7:1-8:0.5-5, nano-cellulose, Polyethylene Glycol and SPSF that described casting solution includes mass ratio;
Described tubulose liquid film is entered behind the air gap in coagulating bath and solidify, be placed in water soaking and washing, obtain the ps hollow fiber uf membrane of nano-cellulose compound.
2. preparation method according to claim 1, it is characterised in that described casting solution is prepared as follows:
Nano-cellulose is dispersed in dimethyl acetylamide, it is subsequently adding polysulfones, Polyethylene Glycol and SPSF, stirring is to forming uniform solution, deaeration, obtaining casting solution, the mass ratio of described polysulfones, nano-cellulose, Polyethylene Glycol and SPSF is 13-30:0.1-7:1-8:0.5-5.
3. preparation method according to claim 2, it is characterised in that the process for dispersing that described nano-cellulose is dispersed in dimethyl acetylamide and adopts is ultrasonic method or homogenizing method.
4. preparation method according to claim 1, it is characterised in that described core liquid is the mixture of dimethyl acetylamide and water.
5. preparation method according to claim 1, it is characterised in that being formed in the step of tubulose liquid film, the flow velocity of casting solution is 10-20g/min.
6. preparation method according to claim 1, it is characterised in that being formed in the step of tubulose liquid film, the flow velocity of core liquid is 10-20ml/min.
7. the preparation method according to claim 1-6 any one, it is characterised in that the length of described nano-cellulose is 30-600nm.
8. the preparation method according to claim 1-6 any one, it is characterised in that the mean molecule quantity of described Polyethylene Glycol is 200-20000.
9. the preparation method according to claim 1-6 any one, it is characterised in that described coagulating bath is water.
10. the preparation method according to claim 1-6 any one, it is characterised in that described the air gap is 0.1-30cm.
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| CN114797501A (en) * | 2022-05-14 | 2022-07-29 | 浙江理工大学绍兴柯桥研究院有限公司 | Preparation method of Jujun grass nanofiber hollow fiber nanofiltration membrane |
| CN114797501B (en) * | 2022-05-14 | 2023-08-08 | 浙江理工大学绍兴柯桥研究院有限公司 | Preparation method of pennisetum sinese nanofiber hollow fiber nanofiltration membrane |
| CN115814621A (en) * | 2022-12-26 | 2023-03-21 | 有研资源环境技术研究院(北京)有限公司 | High-strength hydrophilic hollow fiber membrane and preparation method and application thereof |
| CN115814621B (en) * | 2022-12-26 | 2023-08-29 | 有研资源环境技术研究院(北京)有限公司 | High-strength hydrophilic hollow fiber membrane and preparation method and application thereof |
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