CN114892290B - Coreless liquid dry-wet hollow fiber membrane spinning process - Google Patents
Coreless liquid dry-wet hollow fiber membrane spinning process Download PDFInfo
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- CN114892290B CN114892290B CN202210499043.3A CN202210499043A CN114892290B CN 114892290 B CN114892290 B CN 114892290B CN 202210499043 A CN202210499043 A CN 202210499043A CN 114892290 B CN114892290 B CN 114892290B
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/24—Formation of filaments, threads, or the like with a hollow structure; Spinnerette packs therefor
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D13/00—Complete machines for producing artificial threads
- D01D13/02—Elements of machines in combination
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F1/00—General methods for the manufacture of artificial filaments or the like
- D01F1/02—Addition of substances to the spinning solution or to the melt
- D01F1/08—Addition of substances to the spinning solution or to the melt for forming hollow filaments
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
- Y02P70/62—Manufacturing or production processes characterised by the final manufactured product related technologies for production or treatment of textile or flexible materials or products thereof, including footwear
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- Textile Engineering (AREA)
- Mechanical Engineering (AREA)
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- General Chemical & Material Sciences (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention discloses a coreless liquid dry-wet hollow fiber membrane spinning process, which adopts wet air instead of core liquid to spin the coreless liquid dry-wet hollow fiber membrane, wherein wet air is introduced into an original core liquid pipeline in the spinning process, so that the humidity, pressure and temperature of the air are effectively controlled, other spinning conditions are unchanged, and the phase separation process of casting membrane liquid is controlled by adjusting the humidity, pressure and temperature of the air, so that the regulation and control of the structure and performance of the hollow fiber membrane are realized. According to the coreless liquid dry-wet hollow fiber membrane spinning process, the phase separation process of the casting membrane liquid is controlled by adjusting the humidity, the pressure and the temperature of air, so that the regulation and control of the structure and the performance of the hollow fiber membrane are realized, the novel process saves the core liquid, the process is simple and controllable, and the obtained hollow fiber membrane has excellent and stable performance.
Description
Technical Field
The invention relates to the technical field of hollow fiber membrane spinning, in particular to a coreless liquid dry-wet hollow fiber membrane spinning process.
Background
The coreless liquid dry-wet hollow fiber membrane spinning process is a method for spinning fiber membranes, and a non-solvent Induced Phase Separation (NIPs) method is to immerse a certain proportion of polymer solution into a coagulation bath containing a non-solvent, wherein the solvent in the polymer solution exchanges with the non-solvent from the coagulation bath to cause phase separation, and the NIPs are regarded as the main technology for manufacturing industrial hollow fiber membranes due to simple process, and various parameters of the phase separation process most directly affect the structure and performance of the membrane, including the solvent type, coagulation bath medium, coagulation bath temperature, pre-evaporation time and the like. The composition of the coagulating bath is a key factor influencing the dynamic process of the phase separation process, and along with the continuous development of technology, the requirements of people on the manufacturing process of the coreless liquid dry-wet hollow fiber membrane spinning process are also higher and higher.
The prior coreless liquid dry-wet hollow fiber membrane spinning process has certain defects when in use, firstly, the traditional NIPs hollow fiber membrane spinning process needs to prepare a core liquid containing a certain solvent or other additives in an internal coagulation bath (namely the core liquid), the core liquid is sprayed out from a core liquid channel of a spinning nozzle during spinning, the core liquid is changed into waste water immediately after phase separation, no recycling value exists, the waste water is required to be sprayed out or washed out of the hollow fiber membrane to obtain clean membrane filaments, the solvent or other additives contained in the core liquid increases the subsequent waste water treatment cost, in order to obtain the hollow fiber membrane with an asymmetric structure, the core liquid is added with the solvent to delay and phase separation of the casting membrane liquid, and the core liquid still contains a large amount of water to influence the delay and phase separation process, so that the use of people is not facilitated. The melt cold drawing method is a unitary system, only the heat transfer between the melt and the cooling medium is involved, so the production process is simple, and therefore, we propose a coreless liquid dry-wet hollow fiber membrane spinning process.
Disclosure of Invention
(one) solving the technical problems
Aiming at the defects of the prior art, the invention provides a coreless liquid dry-wet hollow fiber membrane spinning process, which controls the phase separation process of a casting membrane liquid by effectively adjusting the humidity, the pressure and the temperature of air, thereby realizing the regulation and control of the structure and the performance of the hollow fiber membrane, saving the core liquid in the new process, having simple and controllable process, and having excellent and stable performance of the obtained hollow fiber membrane and effectively solving the problems in the background art.
(II) technical scheme
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: a coreless liquid dry-wet hollow fiber membrane spinning process adopts wet air instead of core liquid to spin the coreless liquid dry-wet hollow fiber membrane, wherein wet air is introduced into an original core liquid pipeline in the spinning process, so that the humidity, pressure and temperature of the air are effectively controlled, other spinning conditions are unchanged, and the phase separation process of casting membrane liquid is controlled by adjusting the humidity, pressure and temperature of the air, so that the regulation and control of the structure and performance of the hollow fiber membrane are realized;
the coreless liquid dry-wet hollow fiber membrane spinning process comprises a gas storage tank, an air compressor valve, a first pressure transmitter, a pure water inlet, a first electric regulating valve, a second pressure transmitter, a pressure reducing valve, a second electric regulating valve, a hot water outlet, a hot water heating sleeve, a hot water inlet, a temperature transmitter, a humidity transmitter and an original core liquid pipeline;
the coreless liquid dry-wet hollow fiber membrane spinning process specifically comprises the following operation steps:
s1: when the dry-wet hollow fiber membrane is spun, air is introduced into the position of the original core liquid pipeline, so that the humidity, pressure and temperature of the air are effectively controlled, and other spinning conditions are unchanged;
s2: the first pressure transmitter in the air storage tank is continuous with the air compressor valve, and when the pressure in the air storage tank is lower than 0.1MPa, the air compressor valve is started and air is fed into the air storage tank;
s3: when the temperature is lower than 80%, opening a first electric regulating valve to spray into the air storage tank;
s4: controlling the opening of the second electric regulating valve and controlling the subsequent second pressure transmitter to be stable at a set value, wherein the set value is 0.02-0.03 MPa;
s5: and regulating the temperature and humidity of air by regulating the temperature of hot water of a heater, and carrying out coreless liquid dry-wet hollow fiber membrane spinning.
As a preferable technical scheme, in the step S1, the air humidity is controlled to be 80% -95%, the pressure is controlled to be 0.02-0.03 MPa, and the temperature is controlled to be 30-60 ℃.
As a preferred embodiment of the present application, the air humidity control may be achieved by spraying or steaming air.
As a preferred technical solution of the present application, the pressure control may be implemented by a pressure reducing valve or a regulating type electric valve or a combination of both.
As a preferable technical scheme of the application, the temperature control can be realized by a hot water sleeve heating mode or an electric heat tracing mode.
As a preferable technical scheme, the process in the step S1 is suitable for spinning the casting solution taking polyvinyl chloride, polyvinylidene fluoride, polyethersulfone, polysulfone, polypropylene cyanide and other polymers as main materials, and the viscosity of the casting solution at 50 ℃ is not suitable to be lower than 50000mPa.s.
As a preferable technical scheme, the thickness of the wall of the hollow fiber membrane wire corresponding to the process in the step S1 is not smaller than 100 μm.
As a preferable technical scheme of this application, the position of gas holder connection air compressor machine valve, first pressure transmitter, first electronic governing valve, second electronic governing valve is through inside temperature, humidity and the pressure of air compressor machine valve, first electronic governing valve, second electronic governing valve regulation gas holder.
(III) beneficial effects
Compared with the prior art, the invention provides a coreless liquid dry-wet hollow fiber membrane spinning process, which has the following beneficial effects: the dry-wet hollow fiber membrane spinning process of the coreless liquid is a dry-wet hollow fiber membrane spinning method which uses wet air to replace core liquid, and the split-phase process of the casting film liquid is controlled by effectively adjusting the humidity, the pressure and the temperature of the air, so that the regulation and control of the structure and the performance of the hollow fiber membrane are realized.
Drawings
FIG. 1 is a schematic diagram of the whole structure of a coreless liquid dry-wet hollow fiber membrane spinning process of the invention.
In the figure: 1. a gas storage tank; 2. an air compressor valve; 3. a first pressure transmitter; 4. a pure water inlet; 5. a first electrically operated regulator valve; 6. a second pressure transmitter; 7. a pressure reducing valve; 8. a second electric control valve; 9. a hot water outlet; 10. a hot water heating sleeve; 11. a hot water inlet; 12. a temperature transmitter; 13. a humidity transmitter; 14. original core liquid pipeline.
Detailed Description
The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings and detailed description, but it will be understood by those skilled in the art that the examples described below are some, but not all, examples of the present invention, and are intended to be illustrative of the present invention only and should not be construed as limiting the scope of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention. The specific conditions are not noted in the examples and are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Examples:
as shown in figure 1, the dry-wet hollow fiber membrane spinning process of the coreless liquid adopts wet air instead of core liquid, and the dry-wet hollow fiber membrane spinning of the coreless liquid is carried out, wherein wet air is introduced into an original core liquid pipeline in the spinning process, so that the humidity, pressure and temperature of the air are effectively controlled, other spinning conditions are unchanged, and the phase separation process of the casting film liquid is controlled by adjusting the humidity, pressure and temperature of the air, so that the regulation and control of the structure and performance of the hollow fiber membrane are realized;
the coreless liquid dry-wet hollow fiber membrane spinning process comprises a gas storage tank 1, an air compressor valve 2, a first pressure transmitter 3, a pure water inlet 4, a first electric regulating valve 5, a second pressure transmitter 6, a pressure reducing valve 7, a second electric regulating valve 8, a hot water outlet 9, a hot water heating sleeve 10, a hot water inlet 11, a temperature transmitter 12, a humidity transmitter 13 and an original core liquid pipeline 14;
the coreless liquid dry-wet hollow fiber membrane spinning process specifically comprises the following operation steps:
s1: when the dry-wet hollow fiber membrane is spun, air is introduced into the position of the original core liquid pipeline 14, so that the humidity, pressure and temperature of the air are effectively controlled, and other spinning conditions are unchanged;
s2: the first pressure transmitter 3 in the air storage tank 1 is continuous with the air compressor valve 2, and when the pressure in the air storage tank 1 is lower than 0.1MPa, the air compressor valve 2 is started and air is fed into the air storage tank 1;
s3: when the temperature is lower than 80%, the first electric regulating valve 5 is opened to spray into the air storage tank 1;
s4: controlling the opening of the second electric regulating valve 8 and controlling the subsequent second pressure transmitter 6 to be stable at a set value, wherein the set value is 0.02-0.03 MPa;
s5: and regulating the temperature and humidity of air by regulating the temperature of hot water of a heater, and carrying out coreless liquid dry-wet hollow fiber membrane spinning.
Further, in the step S1, the air humidity is controlled to be 80% -95%, the pressure is controlled to be 0.02-0.03 MPa, and the temperature is controlled to be 30-60 ℃.
Further, air humidity control may be achieved by spraying or steaming the air.
Further, the pressure control can be realized by a pressure reducing valve or a regulating type electric valve or a combination of the two.
Further, the temperature control can be realized by means of heating a hot water sleeve or electrically tracing, and the like.
Furthermore, the process in the step S1 is suitable for spinning the casting solution taking polyvinyl chloride, polyvinylidene fluoride, polyether sulfone, polysulfone, polypropylene cyanide and other polymers as main materials, and the viscosity of the casting solution at 50 ℃ is not suitable to be lower than 50000mPa.s.
Further, the thickness of the wall of the hollow fiber membrane filaments corresponding to the process in the step S1 is not smaller than 100 μm.
Further, the air storage tank 1 is connected with the air compressor valve 2, the first pressure transmitter 3, the first electric regulating valve 5 and the second electric regulating valve 8, and the temperature, the humidity and the pressure inside the air storage tank 1 are regulated through the air compressor valve 2, the first electric regulating valve 5 and the second electric regulating valve 8.
Working principle: the invention comprises a gas storage tank 1, an air compressor valve 2, a first pressure transmitter 3, a pure water inlet 4, a first electric regulating valve 5, a second pressure transmitter 6, a pressure reducing valve 7, a second electric regulating valve 8, a hot water outlet 9, a hot water heating sleeve 10, a hot water inlet 11, a temperature transmitter 12, a humidity transmitter 13 and an original core liquid pipeline 14, wherein air is introduced into the position of the original core liquid pipeline 14 during dry-wet hollow fiber membrane spinning, the humidity, the pressure and the temperature of the air are effectively controlled, other spinning conditions are unchanged, the first pressure transmitter 3 in the gas storage tank 1 is continuous with the air compressor valve 2, when the pressure in the gas storage tank 1 is lower than 0.1MPa, the air compressor valve 2 is started and air is supplemented into the gas storage tank 1, when the temperature is lower than 80%, the first electric regulating valve 5 is opened to spray the gas storage tank 1, the opening of the second electric regulating valve 8 is controlled, the opening of the second pressure transmitter 6 is controlled to be stabilized at a set value, the set value is 0.02-0.03MPa, the temperature of the hot water is regulated by regulating the heater, and the temperature of the air is regulated to the humidity, and the dry-wet hollow fiber membrane is spun.
It should be noted that in this document, relational terms such as first and second (first and second), and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The foregoing has shown and described the basic principles and main features of the present invention and the advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims.
Claims (4)
1. The dry-wet hollow fiber membrane spinning process of coreless liquid adopts wet air instead of core liquid to spin the coreless liquid, and is characterized in that: in the spinning process, wet air is introduced into an original core liquid pipeline, so that the humidity, pressure and temperature of the air are effectively controlled, other spinning conditions are unchanged, and the phase separation process of the casting film liquid is controlled by adjusting the humidity, pressure and temperature of the air, so that the regulation and control of the structure and performance of the hollow fiber film are realized;
the coreless liquid dry-wet hollow fiber membrane spinning process comprises a gas storage tank (1), an air compressor valve (2), a first pressure transmitter (3), a pure water inlet (4), a first electric regulating valve (5), a second pressure transmitter (6), a pressure reducing valve (7), a second electric regulating valve (8), a hot water outlet (9), a hot water heating sleeve (10), a hot water inlet (11), a temperature transmitter (12), a humidity transmitter (13) and an original core liquid pipeline (14);
the coreless liquid dry-wet hollow fiber membrane spinning process specifically comprises the following operation steps:
s1: when the dry-wet hollow fiber membrane is spun, air is introduced into the position of an original core liquid pipeline (14), the humidity, the pressure and the temperature of the air are effectively controlled, other spinning conditions are unchanged, the air humidity is controlled to be 80% -95%, the pressure is controlled to be 0.02-0.03 MPa, the temperature is controlled to be 30-60 ℃, the air humidity is controlled by spraying or filling steam into the air, the pressure is controlled by a pressure reducing valve (7) or an adjustable electric valve or a combination of the pressure and the air, and the temperature is controlled by a hot water heating sleeve (10) in a heating or electric tracing mode;
s2: the first pressure transmitter (3) in the air storage tank (1) is continuous with the air compressor valve (2), and when the pressure in the air storage tank (1) is lower than 0.1MPa, the air compressor valve (2) is started and air is fed into the air storage tank (1);
s3: when the temperature is lower than 80%, the first electric regulating valve (5) is opened to spray into the air storage tank (1);
s4: controlling the opening of the second electric regulating valve (8) and controlling the subsequent second pressure transmitter (6) to be stable at a set value, wherein the set value is 0.02-0.03 MPa;
s5: and regulating the temperature and humidity of air by regulating the temperature of hot water of a heater, and carrying out coreless liquid dry-wet hollow fiber membrane spinning.
2. The coreless liquid dry-wet hollow fiber membrane spinning process of claim 1, wherein: the process in the step S1 is suitable for spinning the casting solution taking polyvinyl chloride, polyvinylidene fluoride, polyethersulfone, polysulfone and polypropylene cyanide polymer as main materials, and the viscosity of the casting solution at 50 ℃ is not suitable to be lower than 50000mPa.s.
3. The coreless liquid dry-wet hollow fiber membrane spinning process of claim 1, wherein: the thickness of the wall of the hollow fiber membrane wire which is suitable for the process in the step S1 is not suitable to be less than 100 mu m.
4. The coreless liquid dry-wet hollow fiber membrane spinning process of claim 1, wherein: the air storage tank (1) is connected with the air compressor valve (2), the first pressure transmitter (3), the first electric regulating valve (5) and the second electric regulating valve (8), and the temperature, the humidity and the pressure inside the air storage tank (1) are regulated through the air compressor valve (2), the first electric regulating valve (5) and the second electric regulating valve (8).
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| CN115416382B (en) * | 2022-09-02 | 2024-03-29 | 南通大学 | Hollow micro-nanofiber non-woven material with laminated structure and preparation method and application thereof |
| CN116407957B (en) * | 2022-12-29 | 2023-09-26 | 南京水诺环保科技有限公司 | Preparation method of one-step molding Gao Tuoyan nanofiltration membrane |
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| JP4599689B2 (en) * | 2000-08-24 | 2010-12-15 | Ｎｏｋ株式会社 | Method for producing porous hollow fiber membrane |
| CN102631844B (en) * | 2012-04-25 | 2014-10-15 | 北京工业大学 | Preparation method of hydrophobe polysulfone microporous membrane |
| CN105579627B (en) * | 2013-07-29 | 2017-09-29 | 三菱化学株式会社 | The manufacture device and manufacture method of hollow form multiple aperture plasma membrane |
| CN206500037U (en) * | 2016-12-16 | 2017-09-19 | 南京膜材料产业技术研究院有限公司 | A kind of preparation facilities of high pollution-resistant polyvinylidene fluoride hollow fiber ultrafiltration membrane |
| CN110871037A (en) * | 2018-08-30 | 2020-03-10 | 中国石油化工股份有限公司 | Hollow fiber separation membrane and preparation method thereof |
| CN215610606U (en) * | 2021-07-01 | 2022-01-25 | 中国科学院青岛生物能源与过程研究所 | Spinning nozzle assembly with gas gap environment controllable function |
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