CN109092082B - High-humidity hollow fiber filter membrane silk pouring method - Google Patents
High-humidity hollow fiber filter membrane silk pouring method Download PDFInfo
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- CN109092082B CN109092082B CN201811171441.2A CN201811171441A CN109092082B CN 109092082 B CN109092082 B CN 109092082B CN 201811171441 A CN201811171441 A CN 201811171441A CN 109092082 B CN109092082 B CN 109092082B
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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
- 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
Abstract
The invention provides a pouring method of high-humidity hollow fiber filter membrane yarns, which comprises the steps of preparing a membrane casting solution by adopting a high-molecular membrane preparation material and a diluent, preparing a solidification core solution by adopting a solvent and water, preparing a solidification atmosphere solution by adopting cellulose acetate and a cosolvent, spraying the filter membrane yarns by utilizing a three-channel spinneret plate, and treating the surfaces of the filter membrane yarns by utilizing an atomized atmosphere solution to finally form the high-humidity hollow fiber filter membrane yarns.
Description
Technical Field
The invention relates to the technical field of membrane separation, in particular to a high-humidity hollow fiber filter membrane silk pouring method.
Background
The hollow fiber filter membrane filaments have the advantages of high packing density, no need of supporting materials, simple production process and the like, and are widely applied to the technical field of separation. The hollow fiber membrane obtained by the preparation method can meet the requirements of the fields of common chemical separation, enrichment, purification and the like on the membrane strength. However, for some applications where the separation strength is high, the strength of the hollow fiber membrane is not satisfactory.
In recent years, enhanced hollow fiber membranes are valued, for example, an inner support hollow fiber membrane is formed by coating a membrane casting solution on the outer surface of a weaving tube and then solidifying the membrane casting solution, the membrane has a single-skin-layer structure and can be used as an external pressure type membrane or a suction type membrane, most of membranes applied to sewage treatment are hollow fiber ultrafiltration membranes, and because the membrane filaments are fine, the filling area in unit volume is large, the water flux is large, the cost is low, the hollow fiber ultrafiltration membranes are widely applied, but the hollow fiber ultrafiltration membranes need to be continuously cleaned in use, the cleaning is easy to cause filament breakage, and the occurrence of the filament breakage can cause the collapse of the whole filtration system.
Because of the problem, the further popularization and application of the ultrafiltration membrane are hindered, and therefore how to increase the breaking force of the membrane yarn is a problem which needs to be solved urgently in the industry at present.
Disclosure of Invention
In view of the above, the invention provides a high-humidity hollow fiber filter membrane silk casting method.
The technical scheme of the invention is realized as follows: the invention provides a high-humidity hollow fiber filter membrane silk pouring method, which comprises the following steps:
step one, preparing a casting solution: mixing a polymer film-making material with a diluent, wherein the mass percent of the polymer film-making material is 25-40%, and the mass percent of the diluent is 60-75%, and uniformly mixing, melting and defoaming the mixture in a spinning kettle at the temperature of 40-80 ℃ to obtain a casting solution;
preparing a solidification core solution, wherein a solvent and water are prepared into the solidification core solution according to the mass ratio of 10-20: 80-90;
step three, introducing the casting solution in the step one into a middle pore channel of a three-channel spinneret plate, and introducing the solidified core solution in the step two into an innermost channel of the three-channel spinneret plate for spraying;
preparing an atmosphere liquid, namely preparing the cellulose acetate and a cosolvent into the atmosphere liquid according to the mass ratio of (40-60) to (60-40);
and step five, extruding the braided tube, the membrane casting solution and the solidified core solution through a spinneret plate simultaneously, atomizing the atmosphere solution prepared in the step four in the air gap through an atomizing device after the extruded and spun solution passes through the atomizing atmosphere solution, then putting the atomized atmosphere solution into the solidified solution for solidification, and then washing, post-treating and winding through a take-up pulley to obtain the high-humidity hollow fiber filter membrane wire.
In addition to the above technical means, preferably, the braided tube is formed by stranding and machine-braiding 50 to 200dtex fibers.
Based on the above technical solution, preferably, the fiber is one of polyester fiber, polyamide fiber, glass fiber, polyethylene fiber, or polypropylene fiber.
On the basis of the above technical solution, preferably, in the step one, the polymer film-forming material is one of polytetrafluoroethylene, polyvinylidene fluoride, polypropylene, polyethylene, polyimide, or polysulfone.
Still more preferably, in the first step, the diluent is one or a mixture of two of dimethylformamide and dimethylacetamide.
On the basis of the above technical scheme, preferably, in the second step, the solvent is one or a mixture of two of dimethyl sulfoxide and N-methylpyrrolidone.
On the basis of the above technical solution, preferably, in step four, the cosolvent is at least one of methyl salicylate, ethyl salicylate, methyl benzoate, ethyl benzoate, benzyl alcohol, and dimethyl collard.
On the basis of the technical scheme, preferably, in the fourth step, the temperature of the atmosphere liquid is 40-80 ℃.
On the basis of the technical scheme, preferably, in the fifth step, the length of the air gap is 15-30 cm.
On the basis of the technical scheme, preferably, in the fifth step, the atomization temperature is 20-50 ℃.
Compared with the prior art, the pouring method of the high-humidity hollow fiber filter membrane filaments has the following beneficial effects:
the invention provides a pouring method of a high-humidity hollow fiber filter membrane filament, which is characterized in that the surface of the membrane filament is treated by using atomized atmosphere liquid in the pouring and extruding process, so that the strength of the membrane filament can be enhanced, the surface hydrophilic capability of the membrane filament is stronger, the filtering resistance of the membrane filament can be improved, and meanwhile, cellulose acetate is used as an atomized atmosphere material, and an extremely thin polymer membrane layer can be formed on the surface of the membrane filament, and the cellulose acetate has certain molecular interception capability and can improve the filtering performance and the mechanical performance of the filter membrane filament.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The invention discloses a high-humidity hollow fiber filter membrane silk pouring method which comprises the following steps:
example 1
Mixing 25g of polytetrafluoroethylene and 75g of dimethylformamide, putting into a three-neck flask, stirring and melting in water bath at 40 ℃, stopping stirring after melting, preserving heat, standing and defoaming; uniformly mixing 10g of dimethyl sulfoxide and 90g of water to obtain a solidified core solution; mixing 40g of cellulose acetate and 60g of methyl salicylate, and heating to 40 ℃ to obtain an atmosphere liquid; 50dtex polyester fiber is twisted and woven into a braided tube; respectively introducing or pouring a braided tube, a membrane casting solution and a solidification core solution into an inner pore channel, a middle pore channel and an outer pore channel in a three-channel spinneret plate, extruding, allowing the extruded membrane filaments to pass through an air gap of 15cm, filling atomized atmosphere liquid into the air gap, allowing the atomized atmosphere liquid to have a temperature of 20 ℃, allowing the membrane filaments to enter the solidification core solution again after passing through the air gap, and performing washing, post-treatment and rolling again to obtain the high-humidity hollow fiber filter membrane filaments.
Example 2
Mixing 30g of polypropylene and 70g of dimethylacetamide, putting into a three-neck flask, stirring and melting in a water bath at 50 ℃, stopping stirring after melting, and preserving heat, standing and defoaming; uniformly mixing 13g of N-methyl pyrrolidone and 87g of water to obtain a solidified core solution; mixing 50g of cellulose acetate and 50g of methyl salicylate, and heating to 50 ℃ to obtain an atmosphere liquid; the polyamide fiber of 100dtex is twisted and woven into a braided tube; respectively introducing or pouring a braided tube, a membrane casting solution and a solidification core solution into an inner pore channel, a middle pore channel and an outer pore channel in a three-channel spinneret plate, extruding, allowing the extruded membrane filaments to pass through an air gap of 20cm, filling atomized atmosphere liquid into the air gap, allowing the atomized atmosphere liquid to have a temperature of 30 ℃, allowing the membrane filaments to enter the solidification core solution again after passing through the air gap, and performing washing, post-treatment and rolling again to obtain the high-humidity hollow fiber filter membrane filaments.
Example 3
Mixing 35g of polyimide, 35g of dimethylformamide and 30g of dimethylacetamide, putting into a three-neck flask, stirring and melting in a water bath at 60 ℃, stopping stirring after melting, preserving heat, standing and defoaming; uniformly mixing 16g of dimethyl sulfoxide and 84g of water to obtain a solidified core solution; mixing 55g of cellulose acetate and 45g of methyl salicylate, and heating to 60 ℃ to obtain an atmosphere liquid; 150dtex glass fiber is twisted and woven into a braided tube; respectively introducing or pouring a braided tube, a membrane casting solution and a solidification core solution into an inner pore channel, a middle pore channel and an outer pore channel in a three-channel spinneret plate, extruding, allowing the extruded membrane filaments to pass through an air gap of 25cm, filling atomized atmosphere liquid into the air gap, allowing the atomized atmosphere liquid to have a temperature of 40 ℃, allowing the membrane filaments to enter the solidification core solution again after passing through the air gap, and performing washing, post-treatment and rolling again to obtain the high-humidity hollow fiber filter membrane filaments.
Example 4
Mixing 40g of polysulfone and 60g of dimethylacetamide, putting into a three-neck flask, stirring and melting in a water bath at 80 ℃, stopping stirring after melting, preserving heat, standing and defoaming; uniformly mixing 19g of dimethyl sulfoxide and 81g of water to obtain a solidified core solution; mixing 60g of cellulose acetate and 40g of methyl salicylate, and heating to 80 ℃ to obtain an atmosphere liquid; 200dtex polyethylene fiber is twisted and woven into a braided tube; respectively introducing or pouring a braided tube, a membrane casting solution and a solidification core solution into an inner pore channel, a middle pore channel and an outer pore channel in a three-channel spinneret plate, extruding, allowing the extruded membrane filaments to pass through an air gap of 30cm, filling atomized atmosphere liquid into the air gap, allowing the atomized atmosphere liquid to have a temperature of 50 ℃, allowing the membrane filaments to enter the solidification core solution again after passing through the air gap, and performing washing, post-treatment and rolling again to obtain the high-humidity hollow fiber filter membrane filaments.
Comparative example 1
Mixing 25g of polytetrafluoroethylene and 75g of dimethyl amide, putting into a three-neck flask, stirring and melting in water bath at 40 ℃, stopping stirring after melting, preserving heat, standing and defoaming; uniformly mixing 20g of dimethyl sulfoxide and 80g of water to obtain a solidified core solution; 50dtex polyester fiber is twisted and woven into a braided tube; respectively introducing or pouring a braided tube, a membrane casting solution and a solidification core solution into an inner pore channel, a middle pore channel and an outer pore channel in a three-channel spinneret plate, extruding, allowing the extruded membrane filaments to pass through an air gap of 15cm, allowing the membrane filaments to enter the solidification core solution after passing through the air gap, and washing, post-treating and rolling again to obtain the high-humidity hollow fiber filter membrane filaments.
Comparative example 2
Mixing 30g of polypropylene and 70g of dimethylacetamide, putting into a three-neck flask, stirring and melting in a water bath at 50 ℃, stopping stirring after melting, and preserving heat, standing and defoaming; uniformly mixing 13g of N-methyl pyrrolidone and 87g of water to obtain a solidified core solution; the polyamide fiber of 100dtex is twisted and woven into a braided tube; respectively introducing or pouring a braided tube, a membrane casting solution and a solidification core solution into an inner pore channel, a middle pore channel and an outer pore channel in a three-channel spinneret plate, extruding, allowing the extruded membrane filaments to pass through an air gap of 20cm, allowing the membrane filaments to enter the solidification core solution after passing through the air gap, and washing, post-treating and rolling again to obtain the high-humidity hollow fiber filter membrane filaments. And (3) performance test results:
the above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A high-humidity hollow fiber filter membrane silk pouring method is characterized by comprising the following steps:
step one, preparing a casting solution: mixing a polymer film-making material with a diluent, wherein the mass percent of the polymer film-making material is 25-40%, and the mass percent of the diluent is 60-75%, and uniformly mixing, melting and defoaming the mixture in a spinning kettle at the temperature of 40-80 ℃ to obtain a casting solution;
preparing a solidification core solution, wherein a solvent and water are prepared into the solidification core solution according to the mass ratio of 10-20: 80-90;
step three, introducing the casting solution in the step one into a middle pore channel of a three-channel spinneret plate, and introducing the solidified core solution in the step two into an innermost channel of the three-channel spinneret plate for spraying;
preparing an atmosphere liquid, namely preparing the cellulose acetate and a cosolvent into the atmosphere liquid according to the mass ratio of (40-60) to (60-40);
and step five, extruding the braided tube, the membrane casting solution and the solidified core solution through a spinneret plate simultaneously, atomizing the atmosphere solution prepared in the step four in the air gap through an atomizing device after the extruded and spun solution passes through the atomizing atmosphere solution, then putting the atomized atmosphere solution into the solidified solution for solidification, and then washing, post-treating and winding through a take-up pulley to obtain the high-humidity hollow fiber filter membrane wire.
2. The method for casting the high-humidity hollow fiber filter membrane yarns as claimed in claim 1, wherein the braided tube is formed by stranding and machine-braiding 50-200dtex fibers.
3. The method as claimed in claim 2, wherein the fiber is one of polyester fiber, polyamide fiber, glass fiber, polyethylene fiber or polypropylene fiber.
4. The method for casting the high-humidity hollow fiber filter membrane wire as claimed in claim 1, wherein in the step one, the polymer membrane material is one of polytetrafluoroethylene, polyvinylidene fluoride, polypropylene, polyethylene, polyimide or polysulfone.
5. The method for casting the high-humidity hollow fiber filter membrane wire according to claim 1, wherein in the first step, the diluent is one or a mixture of two of dimethylformamide and dimethylacetamide.
6. The method for casting the high-humidity hollow fiber filter membrane silk according to claim 1, wherein in the second step, the solvent is one or a mixture of two of dimethyl sulfoxide and N-methylpyrrolidone.
7. The method for casting the high-humidity hollow fiber filter membrane yarns as claimed in claim 1, wherein in the fourth step, the cosolvent is at least one of methyl salicylate, ethyl salicylate, methyl benzoate, ethyl benzoate, benzyl alcohol and dimethyl collard.
8. The method for casting the high-humidity hollow fiber filter membrane wires according to claim 1, wherein in the fourth step, the temperature of the atmosphere liquid is 40-80 ℃.
9. The method for casting the high-humidity hollow fiber filter membrane wires according to claim 1, wherein in the fifth step, the length of the air gap is 15-30 cm.
10. The method for casting the high-humidity hollow fiber filter membrane wires according to claim 1, wherein in the fifth step, the atomization temperature is 20-50 ℃.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS594164B2 (en) * | 1975-12-30 | 1984-01-28 | 旭化成株式会社 | Macro Kagatachi Yukusen Inoseizouhouhou |
| CN101988217A (en) * | 2009-08-04 | 2011-03-23 | 上海太平洋纺织机械成套设备有限公司 | Vertical atomized chemical fiber molding method |
| CN102068918A (en) * | 2010-12-09 | 2011-05-25 | 苏州汇龙膜技术发展有限公司 | Hydrophilic polyethylene hollow fiber membrane and preparation method thereof |
| CN102205208A (en) * | 2011-04-20 | 2011-10-05 | 天津工业大学 | Device for preparing fiber-reinforced hollow fiber film |
| CN103285743A (en) * | 2013-06-28 | 2013-09-11 | 厦门建霖工业有限公司 | Hydrophilization modification method for polyvinyl chloride alloy ultrafiltration membrane |
| CN103949166A (en) * | 2014-04-30 | 2014-07-30 | 刘必前 | Internal pressure type fiber-reinforced filter membrane and preparation method thereof |
-
2018
- 2018-10-08 CN CN201811171441.2A patent/CN109092082B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS594164B2 (en) * | 1975-12-30 | 1984-01-28 | 旭化成株式会社 | Macro Kagatachi Yukusen Inoseizouhouhou |
| CN101988217A (en) * | 2009-08-04 | 2011-03-23 | 上海太平洋纺织机械成套设备有限公司 | Vertical atomized chemical fiber molding method |
| CN102068918A (en) * | 2010-12-09 | 2011-05-25 | 苏州汇龙膜技术发展有限公司 | Hydrophilic polyethylene hollow fiber membrane and preparation method thereof |
| CN102205208A (en) * | 2011-04-20 | 2011-10-05 | 天津工业大学 | Device for preparing fiber-reinforced hollow fiber film |
| CN103285743A (en) * | 2013-06-28 | 2013-09-11 | 厦门建霖工业有限公司 | Hydrophilization modification method for polyvinyl chloride alloy ultrafiltration membrane |
| CN103949166A (en) * | 2014-04-30 | 2014-07-30 | 刘必前 | Internal pressure type fiber-reinforced filter membrane and preparation method thereof |
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