KR20130039648A - Electrospinning apparatus with supersonic stream nozzle - Google Patents

Abstract

PURPOSE: An electrospinning apparatus is provided to collect minute and uniform fibers by controlling a relative position of a gas spray nozzle. CONSTITUTION: An electrospinning apparatus comprises: an electrospinning nozzle(100), a high voltage generator(200), a ground power supply(300), a gas spray nozzle(400), and a collector(500). The collector is placed at a site facing the gas spray nozzle along a flow direction of gas sprayed from the gas spray nozzle. The fiber discharged from the electrospinning nozzle is collected in the collector by a flow force. [Reference numerals] (AA) Electrostatic force; (BB) Gas flow force;

Description

Electrospinning apparatus {ELECTROSPINNING APPARATUS WITH SUPERSONIC STREAM NOZZLE}

The present invention relates to an electrospinning apparatus. More specifically, by applying a supersonic flow force acting in a direction at a predetermined angle with the electrostatic force to the fiber discharged from the electrospinning nozzle, it is possible to generate a shear stress on the fiber to make the diameter of the fiber thinner, thereby Electrospinning which can collect finer diameter fibers and can collect finer and more homogeneous fibers by adjusting the relative position of the electrospinning nozzle which discharges the fiber and the gas injection nozzle which injects the gas. Relates to a device.

Electrospinning is a technique for producing ultra-fine fibers of several tens to hundreds of nanometers in diameter, and its principle and equipment are simpler and easier to apply than other nanofiber manufacturing methods. When electrical force is applied to the polymer solution dissolved or dissolved in the solvent, charge is induced to the liquid surface of the polymer solution bound to the spinneret by the surface tension, and the force due to the mutual repulsion of the induced charges is opposite to the surface tension. Will be generated. When more than the threshold voltage is exceeded above the surface tension of the polymer solution droplets, a polymer solution jet charged by electrical repulsion is released. The jet is torn and fibrized while the jet is flying in the air, and the solvent is volatilized to collect the collector. ) Is made of a nonwoven web in which ultrafine fibers are laminated. The electrospinning web thus formed may have breathability due to numerous microporous structures, and is flexible, ultra thin, and ultra light because it is made of fiber aggregates having a nano range diameter.

Fibers produced by such electrospinning technology have recently undergone extensive scientific research due to their wide range of potential applications, including filtration, fiber optics, protective fabrics, drug delivery systems, tissue engineering scaffolds and gas separation membranes.

In addition, the fibers thus prepared have a diameter of several micrometers to several nanometers depending on the production conditions, the surface area per unit mass is very large and flexible, suggesting the possibility of the adsorbent, and the interfiber microcavity (void) This feature is characterized by high dispersion of external stresses and the possibility of an efficient adsorption membrane that has good flow rate and does not collapse structure when used as an adsorption membrane.

Republic of Korea Patent Publication No. 2003-0077384 is characterized in that to discharge the polymer solution through the spinning nozzle is applied high voltage to spray the compressed air to the lower end of the spinning nozzle to collect the spinning fibers in a web ground state in the lower ground collector Disclosed is a method for producing ultrafine nanofiber webs by electro-blowing. However, this method has a problem that the fibers discharged by the compressed air of high pressure and speed collide with the collector and bounce back, contaminating the nozzle. In addition, in the case of solution spinning, there is a high possibility that the fibers are embrittled by the recovery of the solvent, and the discharge amount decreases as the solvent is recovered, thereby reducing the yield.

In particular, the fiber manufacturing technology by the general electrospinning method according to the prior art has a limit that can not uniformly collect the fine fibers of less than 100nm in diameter, there was a problem that the application range is greatly limited.

The present invention is invented to solve the problems of the prior art, an object of the present invention is to shear the fibers by applying a supersonic flow force acting in a direction forming a predetermined angle with the electrostatic force to the fibers discharged from the electrospinning nozzle It is to provide an electrospinning apparatus capable of generating a stress to make the diameter of the fiber thinner, and thus to homogeneously collect a finer diameter fiber.

Another object of the present invention is to provide an electrospinning apparatus capable of collecting fibers in a finer and more homogeneous state by adjusting the relative position of the electrospinning nozzle for discharging the fibers and the gas injection nozzle for discharging the gas.

The present invention provides an electrospinning nozzle in which a polymer spinning liquid is fiberized and discharged through a high voltage; A high voltage generator for applying a high voltage to the electrospinning nozzle; A ground power source for forming an electric field in a space between the electrospinning nozzle and the fiber discharged from the electrospinning nozzle so as to be guided by an electrostatic force; A gas injection nozzle for injecting gas in one direction; And a collector for collecting the fibers discharged from the electrospinning nozzle, wherein the collector is disposed at a position opposite to the gas jet nozzle along the flow direction of the gas jetted from the gas jet nozzle, from the electrospinning nozzle The discharged fibers are provided to the collector by the flow force of the gas injected from the gas injection nozzle to provide an electrospinning apparatus.

In this case, the ground power may be connected to the gas injection nozzle, and the fiber discharged from the electrospinning nozzle may be guided to the gas injection nozzle by an electrostatic force.

In addition, the ground power source may be connected to a separate ground plate so that fibers discharged from the electrospinning nozzle may be induced to the ground plate by electrostatic force.

Meanwhile, the gas injection nozzle may be configured to inject gas at a supersonic flow rate.

In addition, the electrostatic force direction by the electric field acting on the fibers discharged from the electrospinning nozzle and the flow force direction of the gas by the gas injection nozzle may be formed to be perpendicular to each other.

In addition, the electrospinning nozzle may be spaced apart from the fluidized bed of gas injected from the gas injection nozzle.

In addition, the electrospinning nozzle may be disposed such that the fibers discharged are positioned adjacent to the gas injection nozzles based on the flow flow direction of the gas injected from the gas injection nozzles.

According to another aspect of the present invention, the present invention provides an electrospinning nozzle in which a polymer spinning solution is fibrous and discharged through a high voltage; A high voltage generator for applying a high voltage to the electrospinning nozzle; A ground power source for forming an electric field in a space between the electrospinning nozzle and the fiber discharged from the electrospinning nozzle so as to be guided by an electrostatic force; A gas injection nozzle for injecting gas in one direction; And a collector for collecting the fibers discharged from the electrospinning nozzle, wherein the collector is disposed at a position opposite to the gas jet nozzle along the flow direction of the gas jetted from the gas jet nozzle, from the electrospinning nozzle The discharged fibers are collected in the collector by the flow force of the gas injected from the gas injection nozzle, and a nozzle ground portion connected to the ground power source is provided on the outside of the gas injection nozzle, and the ground power source is connected to the nozzle ground portion. Connected and discharged from the electrospinning nozzle is provided to the electrospinning apparatus, characterized in that guided to the gas injection nozzle by the electrostatic force.

In the electrospinning apparatus, a plurality of nozzle ground portions may be provided to be arranged concentrically around the gas injection nozzle, and the connection to the ground power source of the nozzle ground portion may be interrupted.

In the electrospinning apparatus, a plurality of nozzle grounding portions are provided concentrically around the gas injection nozzle, and the electrospinning nozzles are also arranged to face each other with the same number as the nozzle grounding portion with the gas injection nozzles interposed therebetween. May be

In the electrospinning apparatus, the electrospinning nozzle may alternatively be operated in pairs with the nozzle grounding portions disposed to face each other with the gas injection nozzles interposed therebetween.

According to the present invention, by mounting a gas injection nozzle to apply a supersonic flow force acting in a direction perpendicular to the electrostatic force with respect to the fibers discharged from the electrospinning nozzle, it is possible to generate a shear stress to the fiber to make the diameter of the fiber even thinner And, accordingly, there is an effect that can homogeneously collect fibers of finer diameter.

In addition, there is an effect that can collect the fibers in a more fine and homogeneous state by adjusting the relative position of the electrospinning nozzle for ejecting the fiber and the gas injection nozzle for injecting the gas.

1 and 2 is a conceptual diagram conceptually showing the configuration of an electrospinning apparatus according to an embodiment of the present invention,
3 and 4 is a view showing the experimental conditions and the experimental results of the first experiment through the electrospinning apparatus according to an embodiment of the present invention,
5 and 6 is a view showing the experimental conditions and the experimental results of the second experiment through the electrospinning apparatus according to an embodiment of the present invention,
7 to 9 are diagrams showing the experimental conditions and the experimental results of the third experiment through the electrospinning apparatus according to an embodiment of the present invention.
10 is a schematic state diagram showing the flow rate of the gas flow discharged from the gas injection nozzle of the present invention.
11 is a schematic perspective view of an electrospinning apparatus according to another embodiment of the present invention.
12 is a state diagram showing a state of a polymer spinning liquid guided to a center of a gas injection nozzle of an electrospinning apparatus according to another embodiment of the present invention.
13 and 14 are diagrams showing a state and simulation structure when the end of the electrospinning nozzle of the electrospinning apparatus enters the gas injection flow according to another embodiment.
FIG. 15 is a state diagram showing a state of a polymer spinning liquid guided to a lower end of a gas injection nozzle of an electrospinning apparatus according to another embodiment of the present invention.
FIG. 16 is a state diagram illustrating an excessive voltage application state of a polymer spinning liquid guided to a center of a gas injection nozzle of an electrospinning apparatus according to another embodiment of the present invention.
17 is a schematic perspective view of an electrospinning apparatus according to another embodiment of the present invention.
18 is a schematic structural diagram of an electrospinning apparatus according to another embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to designate the same or similar components throughout the drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

1 and 2 are conceptual diagrams conceptually showing the configuration of an electrospinning apparatus according to an embodiment of the present invention, and FIGS. 3 and 4 are views of a first experiment through an electrospinning apparatus according to an embodiment of the present invention. Figures showing the experimental conditions and the experimental results accordingly.

Electrospinning apparatus according to an embodiment of the present invention is a device capable of homogeneously collecting ultra-fine fibers having a diameter of 100nm or less, the electrospinning nozzle 100, the high voltage generator 200, the ground plate 310 And the gas injection nozzle 400 and the collector 500.

The electrospinning nozzle 100 is configured to discharge the polymer spinning liquid through a high voltage and form a fiber, and is configured in such a manner that the polymer spinning liquid is supplied and discharged from a separate polymer spinning liquid supply unit 110 as shown in FIG. 1. . For example, the polymer spinning solution supply unit may use a syringe pump for supplying the polymer spinning solution in a quantitative manner, and the electrospinning nozzle 100 may be a nozzle in the form of a cone that receives and discharges the polymer spinning solution from the syringe pump. have.

The polymer spinning solution may be a solution used in a general electrospinning apparatus. For example, a solution in which polyvinyl alcohol (PVA) and water are mixed may be used, and a polymer having excellent mechanical properties such as nylon may be used. A strong acid solution such as formic acid can be used. In this case, a separate hood (not shown) may be provided to prevent the polymer spinning solution from being discharged and collected into the external space of the apparatus.

The high voltage generator 200 applies a high voltage to the electrospinning nozzle 100, and correspondingly, a separate ground power source 300 is provided at a position spaced apart from the electrospinning nozzle 100. The ground power source 300 is connected to a separate ground plate 310 as shown in FIG. 1 to form an electric field in the space between the ground plate 310 and the electrospinning nozzle 100 or as shown in FIG. 2. Likewise, the electric field may be formed in the space between the gas injection nozzle 400 and the electrospinning nozzle 100 by being connected to the gas injection nozzle 400. The fiber 600 discharged from the electrospinning nozzle 100 according to the electric field is induced to flow from the electrospinning nozzle 100 toward the ground plate 310 or the gas injection nozzle 400 by the electrostatic force.

For example, as shown in FIG. 1, when the electrospinning nozzle 100 is positioned at the top, and the ground power source 300 is connected to the ground plate 310 positioned vertically below the electrospinning nozzle 100, Since the fiber discharged from the electrospinning nozzle 100 is discharged in a charged state by receiving a high voltage from the high voltage generator 200, the downward electrostatic force by the electric field formed between the electrospinning nozzle 100 and the ground plate 310 Received is guided to flow toward the ground plate 310.

Also, as shown in FIG. 2, when the ground power source 300 is connected to the gas injection nozzle 400, the fibers discharged from the electrospinning nozzle 100 may flow toward the gas injection nozzle 400 in the same principle. Induced.

The gas injection nozzle 400 is configured to inject a gas in a direction different from the direction of the electrostatic force of the electric field, wherein the flow rate of the injected gas is configured to have a speed of about 300 m / s or more with a supersonic flow of Mach number 1 or more. Therefore, the fiber discharged from the electrospinning nozzle 100 receives the force induced by the electrostatic force and at the same time receives the force by the flow flow of the gas injected from the gas injection nozzle 400, the gas flow flow Force is configured to act more than the force induced by the electrostatic force.

In addition, the electrostatic force direction due to the electric field acting on the fiber 600 discharged from the electrospinning nozzle 100 and the flow force direction of the gas by the gas injection nozzle 400 may have a predetermined angle with each other as shown in FIG. 1. In FIG. 1, a predetermined angle may be formed to form a right angle direction. In the structure of the ground plate 310 disposed opposite the electrospinning nozzle, the direction of the electrostatic force and the direction of the gas flow force may be perpendicular to each other so that the fibers discharged from the electrospinning nozzle may stably flow into the gas flow. The predetermined angle between the electrostatic force direction of the nozzle and the gas flow force direction may be appropriately adjusted in consideration of the structure of the ground power source, the distance between the gas injection nozzle and the electrospinning nozzle, and the like.

The collector 500 is configured to collect the fibers 600 discharged from the electrospinning nozzle 100, and may be formed in the form of a glass substrate, and the fibers discharged from the electrospinning nozzle 100 are collected and webed. Form can be achieved. The collector 500 is preferably disposed at a position opposite to the gas injection nozzle 400 in the flow direction of the gas injected from the gas injection nozzle 400 according to an embodiment of the present invention.

According to this structure, the electrospinning apparatus according to the exemplary embodiment of the present invention is a process in which the fiber 600 discharged from the electrospinning nozzle 100 is guided to the ground plate 310 or the gas injection nozzle 100 by electrostatic force. In order to receive the flow force of the gas injected from the gas injection nozzle 400 and acting in the direction perpendicular to the direction of the electrostatic force, the fiber 600 is subjected to the shear stress by the gas flow, thereby making it thinner. It will have a diameter.

At this time, since the flow force of the gas acts on the fiber 600 more than the electrostatic force, as described above, the fiber 600 flows along the flow direction of the gas by the flow force of the gas in the process induced by the electrostatic force . Thus, the collector 500 collecting the fibers 600 is disposed in a position opposite to the gas injection nozzle 400 along the flow direction of the gas injected from the gas injection nozzle 400 to collect the fibers unlike the prior art. Is placed.

In the electrospinning apparatus configured as described above, the shear stress due to the flow of the gas acts on the fibers 600 discharged from the electrospinning nozzle 100 to homogeneously obtain fibers having a finer diameter, for example, a diameter of 100 nm or less. .

On the other hand, the state of the fibers 600 collected according to the position of the electrospinning nozzle 100 and the gas injection nozzle 400 may vary, the electrospinning nozzle 100 and the gas injection nozzle 400 is a gas injection nozzle ( It is preferred that the flow flow of the gas injected from 400 be arranged mutually so that the electrospinning nozzle 100 does not act as a resistive element that interferes with it. To this end, as shown in FIG. 1, the electrospinning nozzle 100 may be spaced apart from the fluidized bed 410 of the gas injected from the gas injection nozzle 400 by a predetermined distance d in a perpendicular direction.

Experimental conditions and results of the first experiment related to this are shown in FIGS. 3 and 4. In the first experiment, the position of the collector 500 is fixed, the gas injection nozzle 400 and the electrospinning nozzle 100 are fixed. Experiments were carried out under two conditions in which the relative positions of were changed. For each result, only the electrospinning nozzle 100 and the gas injection nozzle 400 were used, and both were compared. Various experiments were performed by varying the flow rate of the liquid.

As shown in FIG. 4, when the fiber 600 was collected using only the electrospinning nozzle 100, the diameter of the fiber 600 was relatively large, which is supersonic speed using only the gas injection nozzle 400. Even when the fiber 600 is collected only by the effect of gas flow, it can be seen that the diameter of the fiber 600 is similarly large. On the other hand, when the fibers are collected by using both the electrospinning nozzle 100 and the gas injection nozzle 400, it can be seen that the diameter of the fiber 600 as a whole is more fine, in particular, the experimental results of the conditions 1 and 2 As can be seen through, when the position of the electrospinning nozzle 100 is located spaced apart from the gas flow layer of the gas injection nozzle 400, it can be seen that the finer diameter of the fibers are collected.

5 and 6 are diagrams showing the experimental conditions and the experimental results of the second experiment through the electrospinning apparatus according to an embodiment of the present invention.

The second experiment shown in FIGS. 5 and 6 proceeded to five experimental conditions while varying the relative positions of the electrospinning nozzle 100 and the gas injection nozzle 400 in various ways, and collected fibers according to each experimental condition. 600 is shown in FIG. 6.

In condition 1, the diameter of the fiber 600 is relatively fine, which is 100 nm or less, but the diameter of the fiber 600 is not homogeneous due to the large difference in the diameter. In conditions 3, 4, and 5, the diameter of the fiber 600 is relatively large or In addition, the results show that the collection amount is too small, etc. On the contrary, in condition 2, the diameter of the fiber is not only fine and homogeneous between 50 and 100 nm, but also the collection amount is also relatively high.

It is preferable that the fiber 600 discharged from the electrospinning nozzle 100 is located adjacent to the gas injection nozzle 400 based on the flow flow direction of the gas injected from the gas injection nozzle 400 through the experimental results. It can be seen. Of course, even in this case, the electrospinning nozzle 100 is advantageously arranged to be spaced apart from the gas flow layer 410 in a right direction. That is, S2 is preferably set to a predetermined distance or more so that the electrospinning nozzle 100 is spaced apart from the gas fluidized bed 410 based on the experimental conditions shown in FIG. 5, and in this state, S1 is the electrospinning nozzle 100. It is preferable that the fiber 600 discharged from the small portion is formed to be adjacent to the gas injection nozzle 400.

In conclusion, the electrospinning nozzle 100 is spaced at right angles from the fluidized bed 410 of the gas injected from the gas injection nozzle 400, and the fibers 600 discharged from the electrospinning nozzle 100 are gas. It is preferably disposed so as to be adjacent to the gas injection nozzle 400 along the flow direction of the gas injected from the injection nozzle 400.

In the experiments shown in FIGS. 5 and 6 described above, a solution obtained by mixing 20% by weight of nylon in a formic acid solution as a polymer spray solution is used. In contrast, in FIGS. 7 to 9, 10% nylon in a formic acid solution is used. The result is that a solution mixed at 15% weight ratio is used.

7 to 9 are diagrams showing the experimental conditions and the experimental results of the third experiment through the electrospinning apparatus according to an embodiment of the present invention.

In the third experiment, conditions 1, 2, and 3 were 10% by weight nylon, and conditions 4, 5 and 6 were 15% by weight nylon. In addition, under each condition, S3 was experimented by changing the values of S1 and S2 in the same state.

Through the third experimental result shown in FIGS. 7 to 9, the most homogeneous and fine diameter fibers were collected under the condition 5. That is, in the case of condition 5, the collection rate of the fibers was also relatively high, and the diameter of the collected fibers was also very fine, such as 40 to 50 nm, and the variation was also small. Thus, fibers having a relatively homogeneous diameter could be obtained. The graph shown in FIG. 9 shows the diameter range of the fibers collected under these conditions 5 and their collection rates. In addition, as shown in FIG. 8, in the condition 5, unlike the other conditions, it can be seen that the cutting of the fiber hardly occurred in the process of collecting the fibers.

On the other hand, in the third experiment as described above it can be seen that the electrospinning nozzle 100 is preferably disposed spaced apart from the fluidized bed 410 of the gas injected from the gas injection nozzle 400 in a right direction.

On the other hand, in the above embodiment, the electrospinning apparatus has been described in which the polymer spinning liquid discharged from the electrospinning nozzle is assembled to the collector side along the flow of the gas ejected from the gas spray nozzle, and the gas flow ejected from the gas spray nozzle Since the difference in flow velocity varies considerably with the flow position, the discharge of the polymer spinning liquid discharged to the center position of the gas flow can maximize the collection rate to the collector.

That is, FIG. 10 shows a diagram for analyzing the gas flow discharged from the gas injection nozzle used in the embodiment of the present invention. The gas flow discharged from the injection nozzle discharge port 401 of the gas injection nozzle 400 is the center line OO. The change in flow velocity according to the distance change indicated by (a), (b), and (c) (a> b> c) from Table 1 is as follows.

Distance from centerline O-O (mm) Average flow rate (m / s) (a) 3 119.37 (b) 1.5 424.75 (c) 0 457.89

That is, as the distance from the center of the gas flow increases, a rapid decrease in flow rate occurs. The gas flow is caused by bringing the polymer spinning liquid discharged from the electrospinning nozzle spaced apart from the center line OO by the distance indicated by the reference numeral dz to the center of the gas flow. It is preferable to receive a sufficient velocity energy from the focused to the collector 500.

To this end, the electrospinning apparatus 10a according to another embodiment of the present invention shown in FIG. 11 includes an electrospinning nozzle 100, a high voltage generator 200, a ground power supply 300a, and a gas injection nozzle 400a. And, it comprises a collector 500, the same reference numerals for the same components as in the previous embodiment and the duplicated description is omitted.

The juice grounding part 310a is connected to the ground power supply 300a, and the nozzle grounding part 310a is disposed outside the gas injection nozzle 400a. The ground power supply 300a allows the fiber discharged from the electrospinning nozzle 100 to be guided to the gas injection nozzle 400a by electrostatic force through the connection with the nozzle grounding portion 310a.

The nozzle grounding part 310a is disposed outside the gas injection nozzle 400a as shown in FIG. 11, and the nozzle grounding part of the ground power supply 300a when the gas injection nozzle 400a is formed of steel such as stainless steel. Except for 310a, various modifications are possible, such as taking a structure to insulate the rest with the shielding material.

In the present exemplary embodiment, one ground power source 300a connected to the nozzle grounding unit 310a has a structure in which one electrospinning nozzle 100 is disposed at an opposite end of the nozzle outlet 401 with a center line formed therebetween. In some cases, various modifications are possible, such as taking a structure in which equidistant circumferences are arranged around the nozzle discharge port 401 of the gas injection nozzle 400a. The electrospinning nozzle 100 is spaced apart from the center line formed by the nozzle discharge port 401 of the gas injection nozzle 400a by dz, and the radius of the nozzle discharge port 401 is represented by rn and the diameter dn. When dz is a value larger than rn to dn, for example, dz has a value of 1.5dn or more so that the end of the electrospinning nozzle 100 does not enter the range of the discharge port of the gas injection nozzle 400a. That is, FIG. 13 and FIG. 14 show experiment and simulation results when the end of the electrospinning nozzle 100 enters the range of the nozzle discharge port 401 of the gas injection nozzle 400a. The nozzle grounding unit 310a is shown. The ground power supply 300a having the gas discharge nozzle 400a is disposed at the lower end, and the end of the electrospinning nozzle 100 is disposed close to or close to the center line OO line of the nozzle discharge port 401, so that the original design goal is As shown by the dotted line in FIG. 14, the polymer spinning liquid discharged from the electrospinning nozzle 100 is guided to the ground power supply 300a and in this process is integrated to the collector 500 (see FIG. 11) by the high velocity of the center. Although it is configured to take the structure, as a result of actual experiment, when the electrospinning nozzle 100 exists within the range of the nozzle discharge port 401 of the gas injection nozzle 400a, as shown in FIG. The solvent of the spinning liquid discharged from the electrospinning nozzle 100 is rapidly volatilized and rapidly solidified at the end of the electrospinning nozzle 100, thereby causing a problem that the discharge is blocked. Therefore, it is preferable that the end of the electrospinning nozzle 100 according to the present invention is sufficiently spaced apart from the centerline of the gas injection nozzle 400a so as not to enter the range of the nozzle discharge port 401.

Thus, the experimental results when the end of the electrospinning nozzle 100 is spaced apart from the center line of the gas injection nozzle 400a so as not to enter the range of the nozzle discharge port 401 is shown in Figures 12 and 15. That is, in the case of FIG. 12, the nozzle ground portion of the ground power source is formed on the whole, not the lower end portion of the gas injection nozzle, so that the polymer spinning liquid discharged from the electrospinning nozzle 100 faces the nozzle discharge port 401 when there is no gas jet flow. In the case of FIG. 15, the nozzle grounding part of the ground power supply is formed only at the lower end of the gas injection nozzle, so that the polymer spinning liquid discharged from the electrospinning nozzle 100 has a lower end of the nozzle discharge port 401 when there is no gas injection flow. If it is adjusted to face. In the case of FIG. 12, the polymer spinning liquid discharged from the electrospinning nozzle 100 does not enter the center of the gas flow discharged from the gas injection nozzle 400a, while in FIG. 15, the polymer is discharged from the electrospinning nozzle 100. The spinning liquid is guided at the lower end through the ground power supply 300a of the nozzle grounding portion 310a disposed at the lower end of the nozzle discharge port 401, thereby changing the direction in the central region of the nozzle discharge port 401 of the gas injection nozzle 400a. It is guided to the collector 500 side. That is, in the case of FIG. 15, the ground power supply 300a is connected to the lower end of the gas injection nozzle 400a to form a ground state, and voltage is applied to the electrospinning nozzle 100 to discharge the spinning liquid in a state in which an electric field is formed. In this case, the polymer spinning liquid moves toward the ground power supply 300a at the lower end of the gas injection nozzle 400a, and the direction is changed by the gas flow discharged from the nozzle discharge port 401 of the gas injection nozzle 400a. Properly adjusted by the intensity of the electric field formed between the 300a) and the electrospinning nozzle 100, the polymer spinning liquid moves toward the center of the gas flow to enter the region of high flow velocity and into the collector 500 (see FIG. 11). Seamless and strong integration can be achieved to form a stable and reinforced collection of polymer fibers on one side of the collector 500.

As such, the fiber of the reinforced structure collected by the collector can be obtained through a ground power source having a lower nozzle ground portion disposed opposite to the electrospinning nozzle with the center line of the gas injection nozzle of the present application interposed therebetween.

In the electrospinning apparatus having such a structure, an optimal operation is performed by the magnitude of the voltage applied to the electrospinning nozzle, the discharge pressure of the polymer spinning liquid discharged from the electrospinning nozzle, and the flow rate of the gas flow discharged through the nozzle outlet. For this purpose, it is not desirable to excessively increase the magnitude of the voltage applied to the electrospinning nozzle to direct the polymer spinning liquid discharged from the electrospinning nozzle to the center of the gas flow. FIG. 16 shows experimental and simulation states when the magnitude of the voltage applied to the electrospinning nozzle is increased by 53% than in the case of FIG. 15. That is, even when the magnitude of the voltage applied to the electrospinning nozzle is increased to increase the magnitude of the gas flow, the ground voltage part formed at the bottom of the gas injection nozzle as shown in (b) to achieve stable induction to the center of the gas flow. In the case of experimenting by increasing the voltage applied to the electrospinning nozzle to be induced, as shown in FIG. 16 (a), a conjet for stable spinning of the polymer spinning liquid discharged from the end of the electrospinning nozzle is not formed and the multijet is not formed. Excessive voltage increases are undesirable because multijet may form and result in unstable radiation conditions.

On the other hand, the electrospinning apparatus according to the present invention has shown a structure in which a single electrospinning nozzle is arranged in the above embodiment, it may form a structure in which a plurality of electrospinning nozzles are arranged.

As illustrated in FIG. 17, a plurality of nozzle ground portions 301b, 303b, and 305b of the ground power supply 300b are disposed around the end portion of the gas injection nozzle 400b of the electrospinning apparatus. In this embodiment, a plurality of electrospinning nozzles 100d; 101b, 103b, and 105b are also provided. Each of the nozzle ground portions 301b, 303b, and 305b is disposed to face each of the electrospinning nozzles 100d with the nozzle outlet 401 interposed therebetween. , That is, paired. That is, each of the nozzle grounds forms a state in which the ground power state can be interrupted. When the polymer spinning liquid is discharged from the pair of electrospinning nozzles, the nozzle ground is energized to form a ground state. The polymer spinning liquid discharged from the electrospinning nozzle flows toward the opposite nozzle ground portion, and in this process, the polymer spinning liquid passes through the range of the nozzle discharge port of the gas injection nozzle. Is collected by the collector 500 (see FIG. 11). The pair of electrospinning nozzles and the nozzle ground as described above may be alternately operated to perform alternative operations in a sequential or sequential manner to prevent the formation of multijet in the electrospinning nozzles, thereby enabling smooth polymer spinning. have.

Here, the electrospinning nozzle may be supported by the spinning nozzle support 120. The spinning nozzle support 120 includes a support frame 121 and a support leg 123. A plurality of support leg 123 is provided, one end is supported in contact with the gas injection nozzle 400b, the other end is in contact with the support frame 121. The support frame 121 is implemented in a ring type, and the electrospinning nozzle 100b is disposed outside the support frame 121. Each of the electrospinning nozzles 100b; 101b, 103b, and 105b may be connected to the voltage unit 200b through the radiating nozzle wires 201, 203, and 205 to form a predetermined voltage supply state. The voltage unit 200b may be controlled according to the voltage control signal of the controller 20.

In addition, a plurality of nozzle ground portions 301b, 303b, and 305b are disposed on the outer circumference of the gas injection nozzle 400b at equal intervals at equal intervals with respect to the nozzle discharge ports 401 of the gas dispersion nozzle 400b. Take the structure In addition, the nozzle ground portions 301b, 303b, and 305b are connected to the ground wires 30; 31, 33, and 35, and each of the ground wires 31, 33, and 35 is connected to the ground power cut-off portion shown in FIG. 50 may be connected to the control unit 20 in accordance with the control signal is controlled to the ground state change can be made. That is, as shown in FIG. 18, the electrospinning apparatus of the present invention may include a control unit 20 and a storage unit 30. The control unit 20 may include a polymer spinning liquid in a voltage unit 200b and an electrospinning nozzle. It is connected to the polymer spinning solution supply unit 110b; 111, 113, and 115, the gas injection nozzle 400b, and the ground power cutoff unit 50 to supply a predetermined control signal to adjust the radiation state and the gas flow state and the collector 500 It is possible to enable a smooth fiber collection state and the formation of the fiber material. In addition, the storage unit 30 is connected to the control unit 20 to control the data according to the operation mode, including the preset data such as the radiation amount of the polymer spinning liquid, gas flow pressure / speed and the interruption order of the ground power interrupter. ) To enable a certain smooth operation.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and changes without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas falling within the scope of the same shall be construed as falling within the scope of the present invention.

100: electrospinning nozzle 200: high voltage generator
300: ground power source 310: ground plate
400: gas injection nozzle 410: gas fluidized bed
500: collector 600: fiber

Claims (11)

An electrospinning nozzle in which the polymer spinning liquid is fiberized through a high voltage and discharged;
A high voltage generator for applying a high voltage to the electrospinning nozzle;
A ground power source for forming an electric field in a space between the electrospinning nozzle and the fiber discharged from the electrospinning nozzle so as to be guided by an electrostatic force;
A gas injection nozzle for injecting gas in one direction; And
Collector for collecting the fibers discharged from the electrospinning nozzle
Wherein the collector is disposed at a position opposite to the gas injection nozzle along a flow direction of the gas injected from the gas injection nozzle, and the fibers discharged from the electrospinning nozzle are formed of the gas injected from the gas injection nozzle. Electrospinning apparatus, characterized in that the collector is collected by the flow force.
The method of claim 1,
And the ground power source is connected to the gas injection nozzle, and the fiber discharged from the electrospinning nozzle is guided to the gas injection nozzle by an electrostatic force.
The method of claim 1,
The ground power source is connected to a separate ground plate electrospinning apparatus, characterized in that the fiber discharged from the electrospinning nozzle is guided to the ground plate by the electrostatic force.
The method according to any one of claims 1 to 3,
And the gas injection nozzle injects gas at a supersonic flow rate.
The method of claim 4, wherein
And an electrostatic force direction by the electric field acting on the fibers discharged from the electrospinning nozzle and a flow force direction of the gas by the gas injection nozzle are formed to be perpendicular to each other.
The method of claim 4, wherein
And the electrospinning nozzle is spaced apart from the fluidized bed of gas injected from the gas injection nozzle.
The method of claim 4, wherein
The electrospinning nozzle is disposed so that the discharged fibers are positioned adjacent to the gas injection nozzle relative to the flow flow direction of the gas injected from the gas injection nozzle.
An electrospinning nozzle in which the polymer spinning liquid is fiberized through a high voltage and discharged;
A high voltage generator for applying a high voltage to the electrospinning nozzle;
A ground power source for forming an electric field in a space between the electrospinning nozzle and the fiber discharged from the electrospinning nozzle so as to be guided by an electrostatic force;
A gas injection nozzle for injecting gas in one direction; And
Collector for collecting the fibers discharged from the electrospinning nozzle
Lt; / RTI >
The collector is disposed at a position opposite to the gas injection nozzle along the flow direction of the gas injected from the gas injection nozzle, and the fibers discharged from the electrospinning nozzle are caused by the flow force of the gas injected from the gas injection nozzle. Collected in the collector,
A nozzle ground portion connected to the ground power source is provided outside the gas injection nozzle,
And the ground power source is connected to a nozzle grounding portion so that fibers discharged from the electrospinning nozzle are guided to the gas jet nozzle by electrostatic force. The method of claim 8,
The nozzle ground portion is provided with a plurality of concentric with respect to the gas injection nozzle,
And the connection to the ground power source of the nozzle ground portion is intermittent.
The method of claim 8,
The nozzle ground portion is provided with a plurality of concentric with respect to the gas injection nozzle,
And the electrospinning nozzles are also arranged to face each other with the same number as the nozzle ground portion, with the gas injection nozzles interposed therebetween.
11. The method of claim 10,
And the electrospinning nozzle is alternatively movable in pairs with the nozzle grounding portions disposed to face each other with the gas injection nozzle interposed therebetween.

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