KR20050041199A - A nozzle for electrostatic spinning comprising a wire and a producing method of nano fiber using the same - Google Patents

Abstract

The present invention relates to an electrospinning nozzle comprising a wire and a method of manufacturing nanofibers using the same, and more particularly, to supply sufficient electric force to the polymer solution, to maximize the repulsive force between the polymer solution and the nozzle to enable mass production In addition, the present invention relates to an electrospinning nozzle including a wire, and a method of manufacturing nanofibers using the same, wherein a uniform thickness is possible and a voltage is applied to minimize arcing.

Description

{A NOZZLE FOR ELECTROSTATIC SPINNING COMPRISING A WIRE AND A PRODUCING METHOD OF NANO FIBER USING THE SAME}

The present invention relates to an electrospinning nozzle comprising a wire and a method of manufacturing nanofibers using the same, and more particularly, to supply sufficient electric force to the polymer solution, to maximize the repulsive force between the polymer solution and the nozzle to enable mass production In addition, the present invention relates to an electrospinning nozzle including a wire, and a method of manufacturing nanofibers using the same, wherein a uniform thickness is possible and a voltage is applied to minimize arcing.

As shown in FIG. 1, electrostatic radiation is applied to a polymer solution or melt in a nozzle, and then the capillary tube is brought into balance with the surface tension and the electrical stress of the liquid. The liquid droplets formed at the end are deformed into a pointed cone shape and the liquid is radiated. The fiber spun as described above is accelerated and thinned by an electric field and becomes unstable, and is collected on the surface of the grounded metal which is the recruitment electrode 20 in a discontinuous form. In other words, when a material dissolved in a solution has a low molecular weight, it is generally referred to as electrostatic spraying because it has a small particle shape. However, when a material having a high molecular weight is electrospun, it is generally about 100 nm. Fibers with very small diameters are obtained in the form of fibers which are not oriented or regular. Therefore, the process of obtaining fibers from such a high molecular weight polymer is called electrostatic spinning process to distinguish it from the electrospray process.

However, in the case of the electrospinning method described above, there is a problem in that the electric force effect imparted is lowered because the polymer solution is continuously supplied to the nozzle under high voltage. That is, the electric force imparted to the nozzle is dispersed throughout the polymer solution, and the new polymer solution is continuously supplied according to the electrostatic spraying, so that the electric force is weakened. As a result, the fiber forming effect due to the electric force is lowered, there is a problem that mass production becomes difficult.

In order to solve the problems of the prior art as described above, the present invention minimizes the distance between the polymer solution and the charge in a range that does not affect the process to electrostatic radiation including a wire to facilitate the radiation without deterioration of electric force An object of the present invention is to provide a nozzle and a method for producing nanofibers using the same.

It is another object of the present invention to provide an electrostatic spinning nozzle including a wire which supplies sufficient electric force to the polymer solution, and maximizes the repulsive force between the polymer solution and the nozzle to enable mass production. .

In addition, an object of the present invention is to provide an electrostatic spinning nozzle comprising a wire which is uniformly formed by uniformly spinning the nanofibers in a straight line and the wire is easier to manufacture and a method of manufacturing the nanofibers using the same.

In addition, the present invention can minimize the generation of arc even under high turnover voltage between the nozzle and the recruitment electrode, and stably radiate the polymer solution even when the nozzle is moved or rotated, and can produce a wide nanofiber membrane by expanding the radiation area. An object of the present invention is to provide an electrospinning nozzle including a wire and a method of manufacturing nanofibers using the same.

In order to achieve the above object, the present invention is to provide an electrospinning nozzle comprising a wire, characterized in that it comprises a wire 60 is charged by applying a voltage and a method of manufacturing nanofibers using the same.

Preferably the volumetric body portion 65, the upper portion of the electrospinning nozzle is connected to the lower portion of the electrospinning emitter 15, the lower surface is blocked and includes a micro-holes 70 arranged in a straight line passing through the lower surface ; And a wire 60 parallel to the arrangement of the micro holes and spaced apart from the micro holes 70 by a predetermined distance, and both ends of which are fixed to the inner wall surface of the body portion 65.

Also preferably, the electrostatic radiation nozzle is connected to the lower portion of the electrostatic emission emitter 15, the lower body is blocked, and the body portion 65 including a fine hole 70 arranged in a straight line passing through the lower surface 65 ); And a wire 60 fixed to the fixing protrusion parallel to the arrangement of the micro holes and spaced apart from the micro holes 70 by a predetermined distance and both ends protruding downward from the outer circumferential surface of the lower surface of the body portion 65. It is possible to include.

In another aspect, the present invention provides a method for producing nanofibers, comprising the step of electrostatic spinning the polymer solution through the electrostatic spinning nozzle including the wire (60).

Hereinafter, the present invention will be described in detail.

Electrostatic spinning nozzle of the present invention is characterized in that the voltage is applied to the wire 60 is included in the nozzle, the voltage on the wire 60 and the voltage of the nozzle to the body portion 65 is an equipotential surface, so the nozzle to In the case of the polymer solution that is separated from the wall of the body 65, the polymer solution can be strongly charged when the polymer solution is close to the wire 60, thereby preventing the decrease in the electric force of the polymer solution. In addition, one or two or more wires 60 included in the electrostatic spinning nozzle may be included.

Specifically, the electrospinning nozzle including the wire of the present invention is an embodiment of the present invention as shown in Figures 2 and 3, the upper portion is connected to the lower portion of the electrospinning emitter 15, the lower surface is blocked and penetrates the lower surface. A body portion 65 having a constant volume including fine holes 70 arranged in a straight line to be formed; And a wire 60 parallel to the arrangement of the micro holes 70 and spaced apart from the micro holes 70 by a predetermined distance, and both ends of which are fixed to the inner wall surface of the body part 65. An electrostatic radiation nozzle or upper portion including a wire is connected to the lower portion of the electrospinning emitter 15, and a lower portion of the body portion 65 includes a microhole 70 arranged in a straight line through the lower surface is blocked. ; And a wire 60 fixed to the fixing protrusion parallel to the arrangement of the micro holes 70 and spaced apart from the micro holes 70 by a predetermined distance and both ends protruding downward from the outer circumferential surface of the bottom of the body portion. It can be configured in the form of an electrostatic spinning nozzle comprising a wire characterized in that it comprises.

The nozzle may be manufactured and assembled in a form separate from the electrospinning emitter 15, and the nozzle and the emitter 15 may be integrally manufactured.

The wire 60 should be arranged in parallel with each other in the linear arrangement to correspond to the linear arrangement of the micro holes 70. That is, when the wire 60 is located above the nozzle, as shown in FIG. 2, both ends of the wire can be fixed to the inner wall surface of the body portion 65 without the need for a separate protrusion. In addition, when positioned below the nozzle, the circumferential surface of the body portion 65 may be extended to form a circumferential protrusion as shown in FIG. 3, and both ends of the wire 60 may be fixed to the protrusion or the wire 60 may be formed. Only the part where both ends are connected can be fixed by forming a fixing protrusion.

The thickness of the wire 60 used for the electrostatic spinning nozzle can be selected in various forms according to the purpose of the process, preferably 0.05-0.2 mm, more preferably 0.1 mm. If it is in the above range, less interference with the radiation of the polymer solution, suppressing arcing between the nozzle and the wire 60, it is possible to minimize the electric force degradation.

The material of the wire 60 may be any conductor and use the same material as the nozzle in terms of ease of manufacture and corrosion prevention, or use copper having excellent conductivity, stainless steel having excellent corrosion resistance, and the like.

The shape of the nozzle in which the micropores 70 are processed on the lower surface of the trunk portion 65 has many advantages over the needle-type nozzle 10. That is, the needle nozzle 10 is not only difficult to manufacture and assemble, but also needs to be carefully managed to protect the needle in terms of management of the equipment, and in the case of moving the ejector 15 from side to side, 10) may cause problems such as shaking, so as to solve such a problem, a needle nozzle may be formed by machining a micro hole 70 on the lower surface of the emitter 15 or by combining a nozzle having a micro hole 70 with the nozzle. While having the same configuration as that of (10), it is possible to manufacture a nozzle of a solid shape, and compared with the needle type, the structure is simple, and also has the advantage of manufacturing a larger number of nozzles.

In addition, as shown in FIGS. 2 and 3, the electrostatic spinning nozzle may be configured such that the end of the nozzle is perpendicular to the nozzle hole. That is, the nozzle end forms a shape perpendicular to the nozzle hole, and the end of the nozzle is horizontal with respect to the recruitment electrode. In this case, the electric field between the nozzle and the recruitment electrode 20 may develop evenly, and the area where the distance between the two parts is shortened in the local part does not occur. Therefore, it is possible to minimize the arcing phenomenon that may occur during the manufacturing of the nanofibers (45).

In addition, the rectangular nozzle is advantageous in terms of shape management and standardization of the nozzle, and FIG. 4 shows a perspective view of the rotary ejector 15 using the rectangular nozzle according to an embodiment of the present invention. The electrospinning emitter 15 rotates to release the polymer solution. In the same rotary spinning, the rectangular nozzle has an effect of increasing the spinning area of the polymer solution compared to the general nozzle. At the outward direction, the edge part of the nozzle and the solution interact with each other, so that the polymer solution is directed outward as compared with a general round nozzle.

In addition, the micro holes 70 located at the lower end of the emitter 15 may be distributed on one straight line as shown in the embodiments of FIGS. 2 and 3, or may be configured in a plurality of intersecting straight lines. . Therefore, the arrangement of the micropores 70 may be configured in various forms such as a radial or mesh structure, and accordingly, the wire 60 may be configured in the same form in accordance with the arrangement of the micropores 70. In addition, the number of micropores 70 located on one straight line may be variously changed according to the size and shape of the emitter, the uniformity of the radiation, the productivity, and the like, and the intervals of the micropores 70 may be equally spaced. The gap between the holes becomes narrower or wider toward the center of the lower surface of the nozzle.

At this time, the position of the micro holes 70 located at the ends of the micro holes 70 is preferably spaced apart from the inner wall of the body portion 65 by a predetermined distance. That is, when the micropores 70 are too close to the ends inside the body portion 65, unevenness of the emission may occur due to the interfacial energy effect between the inner wall of the body portion 65 and the polymer solution, and the body portion 65 In the case of being spaced too far from the inner wall, the radiation width is shortened, so there is a problem that the productivity is lowered.

As a specific embodiment of the micropores 70, preferably, the diameter of the micropores 70 is 0.7-1.0 mm, 4-6 mm away from the inner end of the body portion 65, and the thickness of the lower surface It can be configured in the form of 4-16 mm. More preferably, the diameter of the micropores 70 is 0.8 mm, 3 mm from the inner end of the body portion 65, the thickness of the lower surface can be configured to 3 mm. If it is in the above range can be stably radiate the nanofibers 45 having a diameter of 100-1000 nm.

In addition, the spacing between the micropores 70 may be configured in various forms, preferably 4-7 mm, and the spacing distance between the wire 60 and the micropores 70 is 4-7 mm. can do. More preferably, the spacing between the micropores 70 is 5 mm, and the separation distance between the wire 60 and the micropores 70 may be 5 mm. Within the above range, it is possible to induce more uniform spinning of the nanofibers 45, it is possible to suppress the arcing between the nozzle and the wire 60 and to minimize the electric force degradation.

In another aspect, the present invention is to produce a nanofiber 45, including the step of electrospinning the polymer solution through the electrostatic spinning nozzle using a nozzle comprising a wire 60 is applied to the voltage described above It is a method for producing a nanofiber, characterized in that the electrostatic spinning of the polymer solution.

The polymer used in the present invention is a compound that is a raw material of the nanofibers 45 and is a material that can be dissolved by a solvent.

The polymer may be any kind of polymer capable of electrospinning according to the use of the nanofiber 45, for example, when the nanofiber 45 is used as an industrial, in particular, an air filter, nylon, polyethylene, It is preferable from the viewpoint of economics to use polypropylene, cellulose or the like.

Since the solvent in the polymer solution to be used in the present invention may be suitable for dissolving the polymer, those skilled in the art can be selected and used according to the type of polymer. In particular, the polymer solution is preferably 1000 ~ 5000 cps viscosity. If the viscosity of the polymer solution is within the above range it is easy to control the electrospinning and morphology (morphology) of the nanofibers.

The polymer solution is supplied to the electrostatic radiation emitter 15 including the electrostatic radiation nozzle described above by the metering pump 35, and the pressure at this time can be adjusted according to the magnitude of the voltage across both ends, and generally 0.4 -Can be adjusted to 1.0 kg / cm 2.

Electrostatic spinning through the electrospinning method described above to produce a nanofiber 45 consisting of a state in which fibers having a fine (several nm) size is stacked and entangled with each other. At this time, the rotary emitter 15 of FIGS. 4 and 5 rotates itself as described above to radiate the nanofibers 45 to a wide range, as well as a combination of multiple emitters 15 or rotary emitter 15. The nanofibers 45 can be radiated over a wide range through their left and right movements, or through a combination of multiple emitters and their own left and right movements.

In addition, the nanofibers 45 may be collected by rotating the nanofibers 45 on the recruitment electrode 20 through which the nanofibers 45 are collected through a roller, or by heating or heating / pressing them to form a wide film. In order to form a coating layer on the furnace wide fibers, the wide fibers are passed through the rollers under the emitter 15 or the rotary emitter 15 at a constant speed, and the fibrous fibers are spun onto the nanofibers 45. It can be provided to form a coating layer.

The electrospinning apparatus using the electrospinning nozzle has a storage container 40 for storing the polymer solution in addition to the nozzle, a fixed quantity pump 35 for providing a predetermined amount of the polymer solution to the discharger, and a rotary emitter 15 as shown in FIG. ), The rotary device 30, the rotary device drive unit 25 and the high voltage generator 50 to have a high potential in the polymer solution, a rotary roller near the recruitment electrode for the continuous production of the fiber membrane, grounded recruitment electrode 20 It may be configured in the form including a.

Accordingly, a certain flow rate from the storage container is supplied to the rotary or non-rotating emitter 15 by the metering pump 35, and when a high voltage is applied by the high voltage generator 50 between the nozzle and the recruitment electrode 20, The polymer solution may be electrospinned at the electrostatic discharge nozzle. In general, the emitter 15 is not rotated, and when the rotary device 30 is driven by the rotary device driver 25 as necessary, the emitter 15 may rotate and radiate to a larger area. In addition, in order to produce a continuous nanofiber membrane, the winding roller may be configured together so that the fibrous membrane passes continuously over the recruitment electrode 20.

According to the present invention, the distance between the polymer solution and the nozzle may be minimized in a range that does not affect the process to supply sufficient electric force to the polymer solution, and maximize the repulsive force between the polymer solution and the nozzle.

Through this, it is possible to help the mass production by solving the problem of the degradation of fiber formation and the difficulty of mass production due to the decrease of electric force, and to apply the nanofibers of uniform thickness through the linear micro-pores, thereby producing excellent nanofiber membranes. have.

In addition, the arc generation can be minimized even under high turnover voltage between the nozzle and the recruitment electrode, and the polymer solution can be stably radiated even when the nozzle is moved or rotated. At the same time, as the arc generation rate decreases, the turnover voltage can be increased, and the separation distance can be increased accordingly, so that the radiation area can be further enlarged to manufacture a wide nanofiber membrane, thereby reducing the defect rate during mass production. Of course, production costs can be reduced.

 The present invention described above is not limited to the above-described embodiment and the accompanying drawings, and various modifications and changes made by those skilled in the art without departing from the spirit and scope of the present invention described in the claims below. Changes are also included within the scope of the invention.

1 is a system schematic diagram of an electrospinning process.

2 is a rear view and a cross-sectional view of an electrospinning nozzle including a wire which is an embodiment of the present invention.

3 is a rear view and a cross-sectional view of an electrospinning nozzle including a wire which is another embodiment of the present invention.

4 is a schematic diagram of an electrostatic radiation system (integrated) for one embodiment of the present invention.

5 is a perspective view of a plurality of electrospinning nozzles (integrated) arranged in a row in one embodiment of the present invention.

6 is a perspective view of an electrostatic spinning nozzle (integrated type) including a left and right moving mechanism according to an embodiment of the present invention.

Description of the main symbols in the drawings

10: needle nozzle 15: ejector

20: recruitment electrode 25: rotating device drive unit

30: rotating device 35: metering pump

40: solution storage container 45: nanofiber

50: high voltage generator 60: wire

65: body 70: micropores

Claims (9)

Electrostatic spinning nozzle comprising a wire, characterized in that it comprises a wire charged with a voltage applied. The method of claim 1, The electrostatic spinning nozzle is An upper portion connected to a lower portion of the electrospinning emitter, the lower portion of the body portion including a microhole arranged in a straight line through the lower surface is blocked; And, Electrostatic spinning nozzle comprising a wire parallel to the arrangement of the micro holes and spaced apart from the micro holes by a predetermined distance and both ends are fixed to the inner wall surface of the body portion. The method of claim 1, The electrostatic spinning nozzle is An upper portion connected to a lower portion of the electrospinning emitter, the lower portion of the body portion including a microhole arranged in a straight line through the lower surface is blocked; And, Electrostatic including a wire parallel to the array of micropores and spaced apart from the microhole by a predetermined distance and both ends are fixed to the fixing projection protruding downward from the outer peripheral surface of the lower body portion Spinning nozzle. The method according to claim 2 or 3, Electrostatic spinning nozzle comprising a wire, characterized in that the shape of the nozzle end is perpendicular to the nozzle hole. The method according to claim 2 or 3, The micropores are 0.7-1.0 mm in diameter, 4-6 mm away from the inner end of the body portion, the thickness of the lower surface electrostatic spinning nozzle comprising a wire characterized in that 4-16 mm. The method according to claim 2 or 3, An electrospinning nozzle comprising a wire including a wire, wherein the spacing between the micropores is 4-7 mm and the spacing between the wires and the micropores is 4-7 mm. The method according to claim 2 or 3, Electrostatic spinning nozzle comprising a wire comprising a wire, characterized in that the thickness of the wire is 0.05-0.2 mm. The method according to claim 2 or 3, The material of the wire is the same material as the nozzle or electrostatic spinning nozzle comprising a wire, characterized in that any one of the conductor containing stainless steel, copper. A method for producing nanofibers, comprising the step of electrospinning a polymer solution through an electrospinning nozzle comprising the wire of any one of claims 1 to 8.