CN113388899B - Magnetic lens electrostatic spinning device - Google Patents
Magnetic lens electrostatic spinning device Download PDFInfo
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- CN113388899B CN113388899B CN202110799099.6A CN202110799099A CN113388899B CN 113388899 B CN113388899 B CN 113388899B CN 202110799099 A CN202110799099 A CN 202110799099A CN 113388899 B CN113388899 B CN 113388899B
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- magnetic
- power supply
- magnetic lens
- lens
- collecting plate
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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
- D01D5/0007—Electro-spinning
- D01D5/0061—Electro-spinning characterised by the electro-spinning apparatus
- D01D5/0092—Electro-spinning characterised by the electro-spinning apparatus characterised by the electrical field, e.g. combined with a magnetic fields, using biased or alternating fields
Abstract
The invention discloses a magnetic lens electrostatic spinning device which comprises a high-voltage power supply, a direct-current power supply, a collecting plate, an injector, a micro propeller and a magnetic lens. The needle head is arranged at one end of the injector, the collecting plate is arranged in front of the needle head at a proper distance and is grounded, the micro propeller is arranged at the other end of the injector, the positive pole of the high-voltage power supply is connected with the needle head, and the negative pole of the high-voltage power supply is connected with the collecting plate; the magnetic lens comprises a magnetic yoke, a pole shoe, an excitation coil and a direct current power supply, and the direct current power supply supplies power to generate a magnetic focusing effect. The solution in the injector is pushed out by the micro propeller to form a spirally divergent charged jet under the action of a high-voltage electric field, the divergence degree of the jet is greatly reduced under the magnetic focusing action of the magnetic lens, the diameter of the fiber is thinned, the uniformity of the thickness of the fiber is improved, and the fiber is finally deposited on the surface of the collecting plate. The invention can make the electrostatic spinning jet flow more stable, and the fiber diameter and thickness of the obtained fiber membrane are more uniform, thus promoting the application of the fiber membrane in some key fields.
Description
Technical Field
The invention relates to the field of electrostatic spinning, in particular to a magnetic field control device capable of preparing nano fibers with thinner and more uniform thickness.
Background
The electrostatic spinning technology is one of the most direct and effective methods for obtaining the nano-diameter fibers at present, and is widely applied to the fields of biological medicine, lithium ion battery electrodes, sewage filtration, medical protection and the like at present, particularly, the requirements on the number and the quality of masks are increasing during the epidemic situation of new coronary pneumonia at present, and the electrostatic spinning technology can be used for developing better products to meet the requirements.
Although the electrospinning technology is widely applied, higher requirements are also put on the product quality, for example, in the application fields of wastewater filtration and battery separators, the diameter of a fiber membrane is desired to be finer and the thickness distribution is desired to be more uniform, but the electrospinning fiber membrane produced at the present stage is difficult to meet the requirements and form large-scale industrial production, and one of the main reasons is that effective control of the electrostatic spinning divergent charged jet is difficult to perform, so that the fiber diameter of the obtained fiber membrane is thicker and the thickness distribution is not uniform. The fundamental reason for this phenomenon is that in the traditional needle plate type electrostatic spinning process, the jet flow motion ejected from the needle head is easily disturbed, and in the uneven high-voltage electric field between the needle head and the collecting plate, a spiral swing with larger and larger amplitude is generated, and the swing has direction uncertainty, so how to control the spiral swing of the jet flow unstably, and further refine the fiber diameter becomes the key point for solving the problems. At present, researchers have conducted many experimental studies from the perspective of electrospinning equipment and have achieved some beneficial results. However, a mature scheme for effectively improving the spiral instability of the electrostatic spinning jet, refining the fiber diameter and improving the thickness uniformity does not exist so far.
Chinese patent publication No. CN201410098854.8 discloses an electrostatic spinning device with auxiliary air flow and its equipment, the key points of which are: the spinning roller is uniformly provided with a plurality of through holes, the spinning roller is internally provided with an air injection structure with a static position, an air injection area of the air injection structure corresponds to the electrostatic discharge spinning area, the air injection structure upwards injects air flow, and the air flow is blown into the electrostatic spinning area through the through holes. Electrostatic spinning is completed under the coordination of airflow blowing force and electrostatic force, so as to achieve the purpose of thinning the fiber diameter. The method can refine the fiber diameter to a certain extent, but the structure of the equipment is complicated, and the air flow is difficult to uniformly control, so that the average diameter of the fiber is reduced, and the control instability and the thickness unevenness of the fiber are increased.
Chinese invention patent with publication number CN201610064382.3 discloses an electrostatic spinning machine, which has the key points that: a magnetic field generating device is introduced and comprises two magnetic pole plates arranged in the vertical direction, and a rotating device is used for driving the magnetic pole plates to rotate along the central axis so that the magnetic field direction is ceaselessly changed around the central axis, thereby reducing the anisotropy of the inside of the fiber in the spinning process and improving the thickness uniformity and the fiber forming quality of the fiber. The scheme introduces a rotatable magnetic field device, and the size of a magnetic field can not be adjusted due to the fact that the magnetic field device is a permanent magnet, and most importantly, the magnetic field distribution is too dispersed, so that the restriction effect on jet flow is very small, even the formation of a Taylor cone is influenced, and the normal spinning is disturbed.
Disclosure of Invention
The purpose of the invention is: the instability of the electrostatic spinning jet is reduced, the fiber diameter is refined, and the uniformity of the fiber thickness is improved.
In order to achieve the aim, the technical scheme of the invention is to provide a magnetic lens electrostatic spinning device which is characterized by comprising a high-voltage power supply, a direct-current power supply, a collecting plate, an injector, a micro propeller and a magnetic lens;
the needle head is arranged in front of the injector, the collecting plate is arranged in front of the needle head, and the collecting plate and the needle head keep a proper distance and are grounded; the micro propeller is arranged at the rear end of the injector; the positive pole of the high-voltage power supply is connected with the needle head, and the negative pole of the high-voltage power supply is connected with the collecting plate; the magnetic lens is arranged between the needle head and the collecting plate and is coaxial with the needle head, the magnetic lens is connected with a direct current power supply to generate a focusing magnetic field to restrain divergence of charged jet flow, under the stretching of the comprehensive action of electric field force and magnetic field force, spinning solution pushed out of the needle head by the micro propeller forms nano-scale fibers to be deposited on the surface of the collecting plate, and the diameter of the nano-scale fibers is refined through the focusing magnetic field generated by the magnetic lens, so that the thickness of the nano-scale fibers is more uniform.
Preferably, the magnetic lens comprises two magnetic yokes which are buckled with each other, a circle of slit which is used as a pole shoe is reserved between the inner sides of the two magnetic yokes, a lead connected with the excitation coil and the excitation coil positioned between the two magnetic yokes, and a direct-current power supply supplies power to the excitation coil through the lead to generate a magnetic focusing effect.
Preferably, the yoke refers to a high permeability material placed in the center of the magnet loop or poles to guide the flux lines through to reduce the flux loss. The high magnetic conductivity material is soft magnet, pure iron or low carbon steel, and the magnetic yoke in the invention is high magnetic conductivity material Q235.
Preferably, the edge of one of the two magnetic yokes is provided with a through hole, the edge of the other magnetic yoke is provided with blind hole threads, and the two magnetic yokes are fastened and connected through the through hole and the blind hole threads by bolts.
Preferably, a small wire guide hole is formed in the edge of the magnetic yoke with the blind hole threads, and the wire is led out from the small wire guide hole.
Preferably, the two yokes are connected and then internally provided with a circular ring cavity for placing the excitation coil.
Preferably, the pole shoe is formed by a slit reserved after the two magnetic yokes are connected, and is used for restraining the distribution of the magnetic beams and changing the flow direction of the magnetic beams.
Preferably, the excitation coil is circular, is wound with 1360 turns and is placed in the circular cavity of the magnetic yoke.
Preferably, the lead is connected with the direct current power supply, and the direct current power supply can adjust the current magnitude to enable the magnetic lens to generate the focusing magnetic field with variable magnitude.
The invention has the advantages that: the magnetic lens has a simple structure, a magnetic field is concentrated in an unstable jet area, and the formation of a Taylor cone cannot be disturbed, so that the unstable jet phenomenon can be effectively restrained, and the magnetic lens has positive influence on the refinement of the fiber diameter and the improvement of the thickness uniformity of the fiber. The invention can also be popularized to other types of electrostatic spinning equipment, such as multi-needle electrostatic spinning and needleless electrostatic spinning, and the product quality is improved while the electrostatic spinning yield is improved.
Drawings
FIG. 1 is a schematic structural view of a magnetic lens according to the present invention;
FIG. 2 is a schematic diagram of a conventional needle plate type electrostatic spinning system and a jet flow region;
FIG. 3 is a schematic view of the jet region incorporating the excitation coil based on FIG. 2;
FIG. 4 is a schematic diagram of the magnetic lens electrospinning jet area based on FIG. 3;
FIG. 5 is a force diagram of the magnetic lens electrospinning jet shown in FIG. 4;
fig. 6 is a comparative graph of the diameters of the electrospun fibers of fig. 2-4 and a standard deviation reflecting uniformity of fiber thickness under the same process parameters.
In the figure:
1 through hole, 2 magnetic yoke, 3 excitation coil;
4 magnetic yokes, 5 blind holes, 6 conducting wires, 7 high-voltage power supplies, 8 pin plate type jet flow areas and 9 receiving plates;
10 needles, 11 solution, 12 micro-propellers and 13 exciting coil type jet flow areas;
14 excitation coils, 15 direct current power supplies, 16 magnetic lenses, 17 magnetic lens type jet flow areas, 18 pole shoes; 19 wire guides, 20 are grounded.
Detailed Description
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
The magnetic lens electrostatic spinning device disclosed in this embodiment, as shown in fig. 1 and 4, includes a magnetic lens 16, and the structure of the magnetic lens 16 is composed of a magnetic yoke 2, a magnetic yoke 4, a pole shoe 18, an excitation coil 3, a wire 6, and a wire hole 19. Yoke 2 and yoke 4 are inside bellied ring cavity, and 8 through-holes 1 are separated to 2 edge portions of yoke, and 8 blind hole screw threads and wire guide 19 are opened at 4 edges of yoke to furthest reduces the magnetic leakage. The exciting coil 3 is put into the yoke 4, and the lead wire 6 connected to the exciting coil 3 is led out from the lead hole 19, and then the yoke 2 is covered thereon. The excitation coil 3 is arranged between the magnetic yoke 2 and the magnetic yoke 4, the upper hole and the lower hole are aligned, and finally, the excitation coil is firmly connected by 8 bolts. At this time, the magnetic lens is partially assembled, and a circle of slits left on the inner side is the pole shoe 18, and the magnetic field is concentrated and distributed at the pole shoe.
Further, the lead wire 6 from which the magnetic lens 16 is drawn is connected to a dc power supply 15.
Further, as shown in fig. 4, the positive pole of the high voltage power supply 7 is connected to the needle 10, the negative pole of the high voltage power supply 7 is connected to the receiving plate 9, the receiving plate 9 is grounded 20, so as to form a safe and stable electric field environment, and the solution 11 is ensured to stably flow out of the needle hole 10 by the micro propeller 12, so that the magnetic lens electrospinning device is completed.
Further, after the circuit was connected as described above, the high voltage power supply 7 was set to 18kV, the DC power supply 15 was adjusted to 2A, the distance between the needle 10 and the receiving plate 9 was adjusted to 16cm, the magnetic lens 16 was adjusted to be coaxial with the needle 10 and 2cm from the needle, and the liquid supply rate of the micro-propeller 12 was 0.5mL/h. All devices are enabled to work, and under the combined action of electric field force and magnetic field force, nano-scale fibers are formed and deposited on the surface of the receiving plate 9, and the jet flow area is 17.
The specific principle is shown in fig. 5, a certain point with velocity v in jet flow is subjected to stress analysis, because the jet flow is in a nanometer level, the gravity borne by the point can be ignored, and the point is simultaneously subjected to magnetic field force F b Electric field force F e Viscous drag tau, magnetic field force F b And the component of viscous resistance tau acts as centripetal force and points to the axial direction, therefore, under the same condition, the more concentrated the magnetic field distribution, the stronger the constraint action on the jet flow, the smaller the energy loss, and the full stretching of the jet flow can be realized, thereby obtaining thinner fiber diameter, and the more obvious the action on the area with larger radius of the jet flow and higher speed of the jet flow is because the introduced magnetic field is, the more uniform the thickness distribution of the fiber diameter deposited on the collecting plate is ensured.
Comparative example 1
As shown in fig. 3, the electrospinning experiment was completed with the electrostatic spinning apparatus disclosed in comparative example 1 by using only the exciting coil 14 instead of the magnetic lens 16, and the jet flow region was 13, as compared with the magnetic lens electrospinning apparatus disclosed in fig. 4, without changing other parameters.
Comparative example 2
As shown in fig. 2, the electrospinning experiment was performed in the electrospinning device disclosed in this comparative example 2 using the conventional needle plate type with the other parameters being unchanged as compared with the magnetic lens electrospinning device disclosed in fig. 4, and the jet flow region was 8.
As shown in fig. 4, under the same conditions, the jet region of the magnetic lens shown in fig. 4 was the smallest.
Further, as shown in fig. 6, the fibers sprayed by the pin plate type electrostatic spinning, the field coil type electrostatic spinning and the magnetic lens electrostatic spinning were microscopically characterized by SEM, and the results showed that the average fiber diameter of the magnetic lens electrostatic spinning spray was the smallest and the standard deviation was the same as the smallest under the same experimental conditions, indicating that the fiber thickness distribution was uniform.
While the invention has been described with reference to specific embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. The electrostatic spinning device for the magnetic lens is characterized by comprising a high-voltage power supply, a direct-current power supply, a collecting plate, an injector, a micro propeller and the magnetic lens;
the needle head is arranged in front of the injector, the collecting plate is arranged in front of the needle head, and the collecting plate and the needle head keep a proper distance and are grounded; the micro propeller is arranged at the rear end of the injector; the positive pole of the high-voltage power supply is connected with the needle head, and the negative pole of the high-voltage power supply is connected with the collecting plate; the magnetic lens is arranged between the needle head and the collecting plate and is coaxial with the needle head, the magnetic lens is connected with a direct-current power supply to generate a focusing magnetic field to restrain divergence of charged jet flow, under the stretching of the comprehensive action of electric field force and magnetic field force, spinning solution pushed out of the needle head by the micro propeller forms nano-scale fibers to be deposited on the surface of the collecting plate, and the diameter of the nano-scale fibers is refined through the focusing magnetic field generated by the magnetic lens, so that the thickness of the nano-scale fibers is more uniform;
the magnetic lens comprises two magnetic yokes which are buckled with each other, a circle of slit which is left between the inner sides of the two magnetic yokes and is used as a pole shoe, a lead connected with the excitation coil and the excitation coil positioned between the two magnetic yokes, and a direct-current power supply supplies power to the excitation coil through the lead to generate a magnetic focusing effect; the magnetic yoke refers to a high-permeability material which is placed in the center of a magnet loop or two magnetic poles and guides magnetic lines of force to pass so as to reduce magnetic flux loss.
2. The magnetic lens electrospinning device of claim 1, wherein: the edge of one of the two magnetic yokes is provided with a through hole, the edge of the other magnetic yoke is provided with blind hole threads, and the two magnetic yokes are fastened and connected through bolts through the through hole and the blind hole threads.
3. The magnetic lens electrospinning device of claim 2, wherein: and a small wire guide hole is formed in the edge of the magnetic yoke with the blind hole threads, and the wire is led out from the small wire guide hole.
4. The magnetic lens electrospinning device of claim 1, wherein: after the two magnetic yokes are connected, a circular cavity for placing the excitation coil is formed inside the magnetic yokes.
5. The magnetic lens electrospinning device of claim 1, wherein: the pole shoe is composed of two reserved slits after the magnetic yokes are connected and used for restricting the distribution of the magnetic beams and changing the flow direction of the magnetic beams.
6. The magnetic lens electrospinning device of claim 5, wherein: the magnet exciting coil is annular and is placed in the annular cavity of the magnet yoke.
7. The magnetic lens electrospinning device of claim 1, wherein: the wire is connected with the direct current power supply, and the direct current power supply can adjust the current so that the magnetic lens generates a focusing magnetic field with variable size.
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| CN202110799099.6A CN113388899B (en) | 2021-07-15 | 2021-07-15 | Magnetic lens electrostatic spinning device |
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| CN202110799099.6A CN113388899B (en) | 2021-07-15 | 2021-07-15 | Magnetic lens electrostatic spinning device |
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| CN101649508A (en) * | 2009-09-17 | 2010-02-17 | 东华大学 | Preparation method of high-strength carbon fiber |
| CN103614791A (en) * | 2013-12-19 | 2014-03-05 | 苏州大学张家港工业技术研究院 | Electrostatic spinning device for manufacturing nano fibers in electromagnetic field with coupling method |
| CN106480518A (en) * | 2016-09-21 | 2017-03-08 | 华南理工大学 | A kind of electrostatic spinning collection device and the preparation method of gradient orientations structure nano fiber |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7056455B2 (en) * | 2001-04-06 | 2006-06-06 | Carnegie Mellon University | Process for the preparation of nanostructured materials |
| WO2007079488A2 (en) * | 2006-01-03 | 2007-07-12 | Victor Barinov | Controlled electrospinning of fibers |
| CN106757418B (en) * | 2016-11-08 | 2019-10-01 | 上海云同纳米材料科技有限公司 | A kind of electrostatic spinning nano fiber generating device |
| CN106783492A (en) * | 2016-12-14 | 2017-05-31 | 聚束科技（北京）有限公司 | A kind of magnetic lenses and exciting current control method |
| CN109929128B (en) * | 2019-01-28 | 2020-03-17 | 厦门大学 | Near-field direct-writing focusing and micro-pattern separation method based on PEO (polyethylene oxide) electrospun membrane substrate |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101649508A (en) * | 2009-09-17 | 2010-02-17 | 东华大学 | Preparation method of high-strength carbon fiber |
| CN103614791A (en) * | 2013-12-19 | 2014-03-05 | 苏州大学张家港工业技术研究院 | Electrostatic spinning device for manufacturing nano fibers in electromagnetic field with coupling method |
| CN106480518A (en) * | 2016-09-21 | 2017-03-08 | 华南理工大学 | A kind of electrostatic spinning collection device and the preparation method of gradient orientations structure nano fiber |
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