KR20210119592A - Reverse_charged electro hydrodynamic jetting method for manufacturing polymer micro fiber bundle - Google Patents

Abstract

The present invention relates to a method for manufacturing a functional polymer microfiber bundle by using a reverse voltage electrohydrodynamic jetting method and, more specifically, to a method for stably and continuously manufacturing functional microfiber bundles by using the reverse voltage electrohydrodynamic jetting method.

Description

Manufacturing of polymer microfiber bundles and reverse voltage electrohydrodynamic jetting method for same

The present invention relates to a method for manufacturing a functional polymer microfiber bundle using a reverse voltage electrohydrodynamic jetting method. Specifically, it relates to a method for stably and continuously fabricating functional microfiber bundles using a reverse voltage electrohydrodynamic jetting method.

Electrohydrodynamic jetting is a method in which electric charge is injected into a polymer solution jetted from a nozzle, and when the injected charge crosses a critical point, the polymer solution is spun to one side while instantaneous release to obtain fine microfibers. The advantage of the jetting method is that micro-diameter micro-fibers can be continuously extracted without cutting.

By utilizing the electrohydrodynamic jetting, it can be utilized in various fields, from simple microstructures such as micro-scale drug carriers, micro-cylinders and microspheres, to patterning technology used in semiconductors, and micro-scale 3D structures.

However, in the case of the electrohydrodynamic jetting, phenomena such as cutting and whipping of the jetting may occur due to various ancillary variables such as the type of polymer, the type of solvent, and the ratio of the mixed solution. For example, in the case of dimethylformamide (DMF), which is used to dissolve polymers such as polyacrylonitrile (PAN), the dielectric constant value is high, so it is difficult to try electrohydrodynamic jetting during jetting. This is severe, and cuts may also occur. In order to prevent this, when the injected charge is lowered, there is a problem that the polymer solution is not properly jetted.

In addition, in the case of jetting a polymer solution using a high-functional copolymer having a polar functional group inserted therein, the charge does not accumulate smoothly, and the degree of whipping during jetting is severe, making it difficult to apply the patterning technique that must be drawn in a certain line. not smooth

In order to overcome the problems such as whipping and cutting occurring during electrohydrodynamic jetting, the type of polymer, the type of solvent, the concentration of the polymer solution, the voltage strength, the distance between the nozzle and the conductive substrate, the release rate of the polymer solution, the humidity and Although optimization is needed with respect to variables such as nozzle size, difficulties exist to overcome this.

Republic of Korea Patent Publication No. 10-1615576

One object of the present invention is to solve the above problems, by introducing a reverse voltage electrohydrodynamic jetting method, by minimizing the influence on reversible variables such as the type of polymer, the type of the solvent and the voltage strength, A method for continuously and stably spinning fibers without weeping and cutting is provided.

In addition, it is an object of the present invention to provide a method for stably manufacturing a biphasic and core-shell fiber bundle.

Another object of the present invention is to provide a method capable of stably and continuously spinning a highly flexible and highly functional polymer.

In the present invention, in a state in which a nozzle is grounded, applying a voltage to a first collector and spinning a polymer solution in an electrohydrodynamic jetting method to prepare a fiber;

conveying the fibers to a second collector;

manufacturing the fiber into a fiber bundle;

It provides a reverse voltage electrohydrodynamic jetting method comprising a.

According to an aspect of the present invention, the nozzle is movable in the X-axis and the Y-axis and may be fixed to a multi-adapter capable of fixing two or more nozzles.

According to an aspect of the present invention, the first collector may include a conductive substrate selected from iron, copper, and aluminum.

According to an aspect of the present invention, the polymer used in the polymer solution is polyurethane, cellulose, acrylonitrile, polyvinyl acetate, polyvinylpyrrolidone, polyvinyl alcohol, polyethylene oxide, polyacrylic acid, polyacryl. Late, polyfurfuryl alcohol, polystyrene, polyaniline, polyvinylchloride, polyvinylidenefluoride, polyethylene terephthalate, polypropylene, polyethylene, polyimide, polylactic-co-glycolic acid, and poly-3-hydrobutylic acid Any one or a mixture of two or more may be included in the acid or the like.

According to an aspect of the present invention, the polyurethane may include a thermoplastic polyurethane copolymer into which an azide group is introduced.

According to an aspect of the present invention, the nozzle may include two or more.

According to an aspect of the present invention, the nozzle may include a two-phase type.

According to an aspect of the present invention, the nozzle may include a core-shell structure.

The present invention relates to a syringe, a pump connected to the syringe to control the inflow of the polymer solution at a constant speed, a jetting device 200 including a nozzle through which the polymer solution is jetted connected to the lower end of the syringe, and the jetting device 200 In the first collector 400, which simultaneously transports and fiberizes the polymer solution jetted from the first collector 400, the second collector 500 winds the fibers transferred from the first collector in a bundle form, and the voltage applying device 100 Provided is an electrohydrodynamic fiber bundle manufacturing apparatus comprising a connecting wire (300) for connecting the generated electric charge to the nozzle and the primary collector.

The present invention is an adapter comprising a body portion 10 having an X-axis fixing hole 20 for inserting the X-moving shaft and a Y-axis fixing hole 30 for inserting the Y-moving shaft,

The body portion 10,

Polymer solution inlet 50; and

It provides a multi-adapter device including a nozzle fixing part 40 including a nozzle communicating with the polymer solution inlet 50 and discharging the polymer.

The present invention can stably jet a polymer solution having a relative permittivity without whipping and cutting by using the reverse voltage electrohydrodynamic jetting method, unlike the conventional electrohydrodynamic jetting method.

In addition, the present invention can efficiently provide fiber bundles of various polymer seeds by using the reverse voltage electrohydrodynamic jetting.

In addition, the present invention can stably spin a fiber with polyurethane having an azide functional group using the reverse voltage electrohydrodynamic jetting, and in particular, click reaction with an azide functional group on the surface of the fiber. ) can be used to modify various compounds.

1 is a schematic schematic diagram of a reverse voltage electrohydrodynamic fiber bundle device according to the present invention.
2 is a schematic schematic diagram of a multi-adapter device according to the present invention.
3 is an SEM image of the microfiber bundle structure prepared in Example 1. FIG.
4 is an SEM image of the microfiber bundle structure prepared in Example 2.
5 is an SEM image of the microfiber bundle structure prepared in Example 3.
6 is an SEM image of the microfiber bundle structure prepared according to Example 4.
7 is an SEM image of the microfiber bundle structure prepared according to Example 5;
8 is a CLSM image of the microfiber bundle structure prepared according to Example 6.

Hereinafter, the present invention will be described in more detail through embodiments or examples including the accompanying drawings. However, the following specific examples or examples are only a reference for describing the present invention in detail, and the present invention is not limited thereto, and may be implemented in various forms.

Also, unless defined otherwise, all technical and scientific terms have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description herein is for the purpose of effectively describing particular embodiments only and is not intended to limit the invention.

Also, the singular forms used in the specification and appended claims may also be intended to include the plural forms unless the context specifically dictates otherwise.

In addition, when a part "includes" a certain component, this means that other components may be further included rather than excluding other components unless otherwise stated.

In contrast to the conventional electrospinning method, the electrohydrodynamic jetting method is a method for jetting micro-unit fibers, and through the method, a drug carrier, a functional fiber, and even a polymer 3D structure can be manufactured. In the case of electrohydrodynamic jetting, jetting should be maintained continuously and without whipping, but constant jetting may not be possible due to variables such as dielectric constant that changes depending on the type of polymer and the type of solvent that dissolves the polymer. . In order to solve the problem of electrohydrodynamic jetting and to stably manufacture micro-polymer fiber bundles, the present inventors have developed a new electrohydrodynamic jetting method.

In the present invention, in a state in which a nozzle is grounded, applying a voltage to a first collector and spinning a polymer solution in an electrohydrodynamic jetting method to prepare a fiber; conveying the fibers to a second collector; and manufacturing the fiber into a fiber bundle; It provides a reverse voltage electrohydrodynamic jetting method comprising a.

The jetting method is a jetting method different from the conventional method, and is different from the conventional electrohydrodynamic jetting method in which a charge is applied to a nozzle and jetting is performed using a potential difference generated by grounding to a substrate.

The reverse voltage electrohydrodynamic jetting method is a jetting method of a novel idea in which a nozzle is grounded and electric charges are applied to a substrate, unlike the conventional electrohydrodynamic jetting method.

Electrohydrodynamic jetting is a method of jetting by injecting an electric charge into a polymer solution. When using a solvent and a polymer solution having a relatively high relative permittivity, there is a problem in that weeping and cutting occur due to an unstable jetting state. The reverse voltage electrohydrodynamic jetting method can confirm the remarkable effect of remarkably stable and continuous jetting regardless of the type of polymer and solvent by grounding the nozzle and applying an electric charge to the substrate.

Using the jetting method, the present invention successfully produced a fine fiber bundle. A single fine fiber is received from the nozzle to the first collector by grounding the nozzle and applying a positive or negative charge to the first collector.

The first collector may have a cylindrical shape or a conveyor belt shape, but is not limited thereto.

As for the substrate of the first collector, the conductive substrate rotates through a roller, and the single fiber present on the first collector conductive substrate is transferred to the second collector.

The shape of the second collector may be a cylindrical shape or a conveyor belt shape, but is not limited thereto.

The second collector does not inject positive or negative charges, rotates in the same direction as the first collector, and manufactures the single fiber transferred from the first collector in a bundle form.

As the fiber is transferred from the first collector to the second collector, the solvent in the fiber is volatilized, so that when the fiber is wound into a fiber bundle at the second collector, there is an advantage that the fibers do not stick together.

In addition, by adjusting the distance between the first collector and the second collector, the fibers may be drawn to control the diameter of the fibers.

According to an aspect of the present invention, the nozzle is movable in the X-axis and the Y-axis and may be fixed to a multi-adapter capable of fixing two or more nozzles.

The nozzle is fixed to the multi-adapter to enable reverse voltage electrohydrodynamic jetting. The multi-adapter can fix two or more nozzles, and multi-jetting is possible through this. In addition, the multi-adapter can freely move in the X-axis and Y-axis directions to designate a jetting position during the reverse voltage electrohydrodynamic jetting.

In addition, it is possible to manufacture not only fibers but also structures such as patterning and 3D structures through the device.

According to an aspect of the present invention, the first collector may include a conductive substrate selected from iron, copper, and aluminum.

The first collector may be in the form of a rotating cylindrical or conveyor belt, and a surface of the first collector may be made of a conductive material.

In the reverse voltage electrohydrodynamic jetting, copper, iron, and aluminum may be used to impart a charge to the first collector in a jetting manner by grounding the nozzle and applying an electric charge to the first collector, but if it is a conductive material, it is greatly limited it doesn't happen

In addition, the type of polymer used in the present invention is not particularly limited, and in particular, it is possible to jet a polymer in which charge is difficult to accumulate, such as a polar or conductive polymer.

More specifically, with respect to the type of polymer, polyurethane (Polyurethane), cellulose (Cellulose), polyacrylonitrile (PAN, Polyacrylonitrile), polyvinyl acetate (PVAc, Poly (vinyl acetate)), polyvinylpyrrolidone (PVP, Polyvinylpyrrolidone), polyvinyl alcohol (PVA, Polyvinyl alcohol), polyethylene oxide (PEO, Polyethylene oxide), polyacrylic acid (PAA, Polyacrylic acid), polymethyl methacrylate (PMMA, Polymethylmethacrylate), polyfur Furyl alcohol (PPFA, Polyfurfuryl alcohol), polystyrene (PS, Polystyrene), polyaniline (PANI, Polyaniline), polyvinyl chloride (PVC, Polyvinylchloride), polyvinylidene fluoride (PVDF, Poly(vinylidene fluoride)), polyethylene terephthalate (PET, Polyethylene terephthalate), Polypropylene (PP, Polypropylene) Polyethylene (PE, Polyethylene), Polyimide, Poly lactic-co-glycolic acid, and Poly-3 -Hydrobutyric acid (poly[(R)-3-hydrobutyric acid]) may include any one or a mixture of two or more, but is not limited thereto.

If the polymer is subjected to the conventional electrohydrodynamic jetting method, severe weeping and cutting may be made, and it may be difficult to continuously and stably manufacture microfibers.

On the other hand, when the reverse voltage electrohydrodynamic jetting is used, there is no whipping or cutting during jetting of the polymer solution in which the polymers are dissolved, and microfibers can be stably and continuously manufactured.

In addition, the polymer solvent used in the present invention is not particularly limited, and jetting can be performed stably and continuously even using a solvent having a high relative permittivity.

In the reverse voltage electrohydrodynamic jetting, since the electric charge is not injected into the polymer solution jetted from the nozzle by grounding the nozzle and injecting electric charge into the substrate, jetting is not unstable even when using a solvent with high relative permittivity during jetting, and By injecting electric charges, jetting can be performed continuously and stably due to a potential difference between the nozzle and the substrate.

This is a significant effect generated by attempting reverse voltage electrohydrodynamic jetting, which results in micro spears, micro cylinders, micro fiber bundles, patterning and 3D structures (3D). structure) can be successfully fabricated.

According to an aspect of the present invention, the polyurethane-based copolymer may include a thermoplastic polyurethane (Azido-TPU) into which an azide group is introduced.

The azide group is capable of introducing various functional groups and bonding of chemical substances through a chemical reaction such as an azide-alkyne click reaction. By preparing a thermoplastic polyurethane containing such an azide group, it is possible to prepare a high-functional polymer capable of modifying the surface with various functional groups. In the case of the Azido-TPU, there is a disadvantage that it is not easy to perform the conventional electrohydrodynamic jetting.

On the other hand, in the reverse voltage electrohydrodynamic jetting method of the present invention, there is no weeping at all in jetting the Azido-TPU, and no cutting occurs, so there is an advantage of stably and continuously implementing microfibers.

This is a remarkable effect, and through this, a high-functional microstructure can be easily manufactured through the azide-alkyne click reaction, and there is an advantage in that more complex structures can also be stably manufactured.

According to an aspect of the present invention, the nozzle may include two or more.

The reverse voltage electrohydrodynamic jetting may implement two or more nozzles to manufacture microfibers of various structures.

According to an aspect of the present invention, the nozzle may include a bi-phase. The two-phase structure may include two different polymers in a single fiber forming the structure, and through this, a Janus structure such as a Janus particle, a Janus cylinder, and a Janus patterning can be formed. can be manufactured. The Janus structure may be implemented in three phases (Tri-phase) or four phases (tetra-phase), and the number is not limited.

In order to manufacture the Janus structure, there is a feature that a repulsive force between the jets due to whipping and applied voltage should not occur during electrohydrodynamic jetting. has a characteristic.

According to an aspect of the present invention, the nozzle may be a core-shell.

The core-shell structure may be composed of polymers having different shells and cores, and through this, a complex and functional structure such as a drug delivery system and a sensor may be manufactured. In the case of the core-shell, in using electrohydrodynamic jetting, stability without whipping and cutting takes precedence. This is because different polymers are used, so the solvent for dissolving them may also vary, and accordingly, when electrohydrodynamic jetting, severe Weeping and cutting can be done.

On the other hand, by using the reverse voltage electrohydrodynamic jetting, weeping and cutting are not performed during jetting, and there is an advantage in that a structure of a core-shell structure can be provided in a fairly stable manner.

In addition, the present invention is a jetting apparatus 200 including a syringe capable of accommodating a polymer solution, a pump connected to the syringe to control the inflow of the polymer solution at a constant speed, and a nozzle through which the polymer solution connected to the lower end of the syringe is jetted ), a first collector 400 that simultaneously transports the polymer solution jetted by the jetting device 200 into fibers, and a second collector 500 that winds the fibers transferred from the first collector in a bundle form. And it is possible to provide an electrohydrodynamic fiber bundle manufacturing apparatus consisting of a connecting wire 300 for connecting the electric charge generated in the voltage applying device 100 to the nozzle and the primary collector.

The present invention provides the electrohydrodynamic fiber bundle manufacturing apparatus for manufacturing a fiber bundle by performing reverse voltage electrohydrodynamic jetting.

Specifically, in FIG. 1 , a syringe capable of accommodating a molecular solution, a pump connected to the syringe to control the inflow of the polymer solution at a constant speed, and a nozzle connected to the lower end of the syringe through which the polymer solution is jetted. Reference numeral 200 denotes a device typically used for electrohydrodynamic jetting, but a ground wire is connected to the nozzle of the jetting device, so that the polymer solution jetted from the nozzle has a charge value of zero.

The voltage applying device 100 may provide the voltage from 0.1 kV to 30 kV, but is not limited thereto. In addition, a charge for the provided voltage may be a positive charge or a negative charge, but is not limited thereto as long as only a potential difference can be provided. The voltage provided from the voltage applying device flows to the first collector 400 through the connecting wire, and a charge is applied to the first collector 400 . In the first collector 400 , the substrate rotates in a container belt manner, and the fine fibers jetted by the jetting device are transferred to the second collector 500 through the first collector 400 . The first collector 400 and the second collector 500 rotate in the same direction as shown in FIG. 1 , and may rotate in the reverse direction depending on circumstances. The second collector 500 does not inject an electric charge, so the electric charge is 0, and the second collector 500 receives the fibers and rotates to provide the fibers in the form of bundles.

When the fibers transferred from the first collector 400 are dried during the transfer process and provided in the form of a fiber bundle to the second collector 500, the solvent contained in the polymer fibers volatilizes and does not stick to each other.

The present invention is an adapter comprising a body portion 10 having an X-axis fixing hole 20 for inserting the X-moving shaft and a Y-axis fixing hole 30 for inserting the Y-moving shaft,

The body portion 10,

Polymer solution inlet 50; and

It provides a multi-adapter device including a nozzle fixing part 40 including a nozzle communicating with the polymer solution inlet 50 and discharging the polymer.

FIG. 2 shows a multi-adapter including a body 10, an X-axis fixing hole 20, a Y-axis fixing hole 30, a nozzle fixing part 40, and a polymer solution inlet 50. As shown in FIG.

The body portion 10 may insert and fix a movable shaft movable in one or the other direction into the X-axis fixing hole 20 and the Y-axis fixing hole 30, and the movable shafts are disposed on one side or the other side. As it moves to the side, the multi-adapter can move along the X and Y axes.

Since the nozzle fixing part 40 is included in the body part 10, there is an advantage in that the nozzle is not shaken during reverse voltage electrohydrodynamic jetting, so that jetting is performed smoothly.

In addition, the nozzle fixing unit 40 includes a space for fixing two or more nozzles, so that jetting of the two-phase type and the core-shell structure is possible. The nozzle and the nozzles fixed to the nozzle fixing part 40 may be smoothly injected with the polymer solution through the polymer solution injection hole 50 .

By performing reverse voltage electrohydrodynamic jetting using the multi-adapter, not only microfiber bundles but also structures such as patterning and 3D printing can be provided.

Hereinafter, the present invention will be described in more detail based on Examples and Comparative Examples. However, the following Examples and Comparative Examples are only examples for explaining the present invention in more detail, and the present invention is not limited by the following Examples and Comparative Examples.

[Example 1]

A syringe capable of accommodating a polymer solution, a pump connected to the syringe to control the inflow of the polymer solution at a constant speed, a nozzle through which the polymer solution is jetted connected to the lower end of the syringe, and fiberizing the polymer solution jetted from the nozzle An electro-hydrodynamic fiber bundle composed of a primary collector that simultaneously transports the fibers and a secondary collector that winds the fibers transferred from the primary collector in a bundle form, and a voltage applying device connected to the nozzle and the primary collector A manufacturing apparatus was used. The syringe used a 1ml norm-ject syringe, and the pump was an Infusion syringe pump from New-era. The nozzle used a 25G needle, and the voltage applying device was Conver Tech's SHV-50R -25kV model. An aluminum foil was used as the substrate used in the first and second collectors.

Electrohydrodynamic jetting was performed by applying a high voltage to the first collector, which was grounded to the nozzle and served as a substrate.

PLGA (Poly lactic-co-glycolic acid, Mw 50,000-75,000 g/mol) solution was used as the polymer solution jetted from the nozzle. The PLGA solution was a solvent in which tetrahydrofuran (THF; tetrahydrofuran) and dimethylformamide (DMF; Dimethylformamide) were mixed in a ratio of 6:4, and the concentration was prepared at 70w/v%. The distance between the nozzle and the first collector was fixed to 1.5 cm, a voltage of 3 kV was applied, and the flow rate was 50 μl/h.

The electrohydrodynamic jetting result was observed through a Tescan Mira3 scanning electron microscope (SEM), and the SEM image is shown in FIG. 3 .

From FIG. 3, it can be seen that the fiber bundle was manufactured through the electrohydrodynamic jetting, and the diameter of the single fiber was very fine at the level of about 20 μm.

[Example 2]

The electrohydrodynamic fiber bundle manufacturing apparatus of Example 1 was used. In the same manner as in Example 1, the nozzle was grounded and a voltage was applied to the substrate.

A solution containing thermoplastic polyurethane (TPU, Mw 100,000 g/mol) was used as the polymer solution jetted from the nozzle. As the solution, a solvent in which THF and DMF were mixed in a ratio of 6:4 was used, and the concentration was prepared at 20w/v%. A voltage of 3 kV was applied and the flow rate was 70 μl/h.

The electrohydrodynamic jetting result was observed through a scanning electron microscope, and the SEM image is shown in FIG. 4 .

From FIG. 4, it can be seen that a fiber bundle was formed through the electrohydrodynamic jetting, and the diameter of the single fiber was very fine at the level of about 20 μm.

[Example 3]

The electrohydrodynamic fiber bundle manufacturing apparatus of Example 1 was used. In the same manner as in Example 1, the nozzle was grounded and a voltage was applied to the substrate.

A solution containing a thermoplastic polyurethane (Azido-TPU, Mw 80,000 g/mol) introduced with an azide group was used as a polymer solution jetted from the nozzle. A solvent in which THF and DMF were mixed at 6:4 was used, and Azido-TPU and thermoplastic polyurethane (TPU) were mixed at a ratio of 1:1 to prepare a concentration of 30w/v%. A voltage of 3 kV was applied and the flow rate was 70 μl/h.

The electrohydrodynamic jetting result was observed through a scanning electron microscope, and the SEM image is shown in FIG. 5 .

From FIG. 5, it can be seen that a fiber bundle was formed through the electrohydrodynamic jetting, and the diameter of the single fiber was very fine at the level of about 20 μm.

[Example 4]

The electrohydrodynamic fiber bundle manufacturing apparatus of Example 1 was used. In the same manner as in Example 1, the nozzle was grounded and a voltage was applied to the substrate.

A solution containing poly-3-hydrobutyric acid (poly[(R)-3-hydrobutyric acid], nature origin) was used as a polymer solution jetted from the nozzle. As the solution, a solvent in which TFE (and DMF were mixed at 6:4) was used, and the concentration was prepared at 10w/v%. A voltage of 2.7kV was applied and the flow rate was 90μl/h.

The electrohydrodynamic jetting result was observed through a scanning electron microscope, and the SEM image is shown in FIG. 6 .

From FIG. 6, it can be seen that a fiber bundle was formed through the electrohydrodynamic jetting, and the diameter of the single fiber was very fine at the level of about 20 μm.

[Example 5]

The electrohydrodynamic fiber bundle manufacturing apparatus of Example 1 was used. In the same manner as in Example 1, the nozzle was grounded and a voltage was applied to the substrate.

A solution containing polymethyl methacrylate ((poly)methyl methacrylate, Mw 120,000 g/mol) was used as a polymer solution jetted from the nozzle. As the solution, a solvent in which THF and DMF were mixed in a ratio of 6:4 was used, and the concentration was prepared at 40w/v%. A voltage of 3 kV was applied and the flow rate was 70 μl/h.

The electrohydrodynamic jetting result was observed through a scanning electron microscope, and the SEM image is shown in FIG. 7 .

From FIG. 7, it can be seen that a fiber bundle was formed through the electrohydrodynamic jetting, and the diameter of the single fiber was very fine at the level of about 20 μm.

[Example 6]

The same electrohydrodynamic 3D patterning apparatus as in Example 1 was used, except that each was two syringes and a nozzle. In the same manner as in Example 1, the nozzle was grounded and a voltage was applied to the substrate. Two nozzles were combined side by side and used.

As a polymer solution, a solution containing Azido-TPU was used on one side. A solvent in which THF and DMF were mixed in a ratio of 6:4 was used, and Azido-TPU and TPU were mixed in a ratio of 1:1 to prepare a concentration of 30w/v%. On the other side, a 20w/v% TPU solution using a solvent mixed with THF and DMF in a ratio of 6:4 was used, and a blue chemical dye Poly[(m-phenylenevinylene)-co-(2,5-dioctoxy-p-phenylenevinylene) was used. ] was inserted.

The two-phase structure was patterned by the electrohydrodynamic co-spray method. A voltage of 3 kV was applied, the flow rate was 70 μl, and the printing distance was 2 cm.

The electrohydrodynamic jetting results were observed through LEICA DMLB confocal laser scanning microscopy (CLSM), and the CLSM image is shown in FIG. 8 .

From FIG. 8, it can be seen that a fiber bundle was formed through the electrohydrodynamic jetting, and the diameter of the single fiber was very fine at the level of about 20 μm.

[Comparative Example 1]

In Example 2, the same procedure was performed except that electrohydrodynamic jetting was attempted by grounding the first collector and applying a voltage to the nozzle.

There was whipping during electrohydrodynamic jetting, so that it was not evenly and uniformly spun, and a consistent fiber bundle could not be obtained.

[Comparative Example 2]

In Example 3, the same procedure was performed except that electrohydrodynamic jetting was attempted by grounding the first collector and applying a voltage to the nozzle.

There was severe whipping during electrohydrodynamic jetting, so that the spinning was not uniformly, and in particular, the fibers could not be continuously produced due to cutting.

[Comparative Example 2]

In Example 7, the same procedure was performed except that electrohydrodynamic jetting was attempted by grounding the first collector and applying a voltage to the nozzle.

There was severe whipping during electrohydrodynamic jetting, so that the spinning was not uniformly, and in particular, the fibers could not be continuously produced due to cutting.

As described above, the present invention has been described with specific details and limited examples and drawings, but these are only provided to help a more general understanding of the present invention, and the present invention is not limited to the above embodiments, and the present invention is not limited to the above embodiments. Various modifications and variations are possible from these descriptions by those of ordinary skill in the art.

Therefore, the spirit of the present invention should not be limited to the described embodiments, and not only the claims to be described later, but also all those with equivalent or equivalent modifications to the claims will be said to belong to the scope of the spirit of the present invention. .

10: body part
20: X axis fixing hole
30: Y axis fixing hole
40: nozzle fixing part
50: polymer solution inlet
100: POWER SUPPLY
200: nozzle
300: connecting wire
400: first collector
500: second collector

Claims (10)

In a state in which the nozzle is grounded, applying a voltage to the first collector and spinning a polymer solution by an electrohydrodynamic jetting method to prepare a fiber;
conveying the fibers to a second collector;
manufacturing the fiber into a fiber bundle;
A reverse voltage electrohydrodynamic jetting method comprising a. 2. The method of claim 1
The nozzle is movable in the X-axis and the Y-axis, and the reverse voltage electrohydrodynamic jetting method is fixed to a multi-adapter capable of fixing two or more nozzles. The method of claim 1,
The first collector is a reverse voltage electrohydrodynamic jetting method comprising a conductive substrate selected from among iron, copper and aluminum. The method of claim 1,
Polymers used in the polymer solution include polyurethane, cellulose, acrylonitrile, polyvinyl acetate, polyvinylpyrrolidone, polyvinyl alcohol, polyethylene oxide, polyacrylic acid, polyacrylate, polyfurfuryl alcohol, and polystyrene. , polyaniline, polyvinyl chloride, polyvinylidene fluoride, polyethylene terephthalate, polypropylene, polyethylene, polyimide, polylactic-co-glycolic acid, and poly-3-hydrobutylic acid any one or a mixture of two or more A reverse voltage electrohydrodynamic jetting method comprising a. 5. The method of claim 4,
The polyurethane is a reverse voltage electrohydrodynamic jetting method comprising a thermoplastic polyurethane copolymer into which an azide group is introduced. The method of claim 1,
The reverse voltage electrohydrodynamic jetting method comprising two or more nozzles. 7. The method of claim 6,
wherein the nozzle comprises a two-phase type. 7. The method of claim 6,
wherein the nozzle comprises a core-shell structure. A syringe, a pump connected to the syringe to control the inflow of the polymer solution at a constant speed, a jetting device 200 including a nozzle through which the polymer solution connected to the lower end of the syringe is jetted, and the jetting device 200 The first collector 400 that simultaneously transports the polymer solution while making it into fibers, the second collector 500 that winds the fibers transferred from the first collector into a bundle in a bundle form, and the electric charge generated by the voltage applying device 100 An electrohydrodynamic fiber bundle manufacturing apparatus comprising a connecting wire (300) for connecting to the nozzle and the first collector. An adapter comprising a body portion 10 having an X-axis fixing hole 20 for inserting the X-moving shaft and a Y-axis fixing hole 30 for inserting the Y-moving shaft,
The body portion 10,
Polymer solution inlet 50; and
A multi-adapter device comprising a nozzle fixing part 40 that communicates with the polymer solution injection port 50 and includes a nozzle for discharging the polymer.

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