Melt-blowing electrostatic spinning device for preparing superfine nanofiber non-woven fabric

Abstract

The present invention relates to a melt-blowing electrostatic spinning apparatus for preparing a superfine nanofiber nonwoven fabric, comprising: an extruder for preparing a polymer melt; a gear pump for quantitatively transferring the melt from the extruder; a spinning nozzle for discharging the polymer melt transferred from the gear pump; a collector for collecting the spinning fibers discharged from the spinning nozzle in a mesh state; and a voltage applying means for applying a high voltage between the spinning nozzle and the collector, the spinning nozzle comprising: an upper spinning nozzle mold provided with a spinning port for discharging the polymer melt; and a lower injection nozzle mold provided facing the upper nozzle mold and provided with air flow paths in two directions and an injection port for discharging air and a polymer melt from the lower portion of the spinning port, the angle of the air flow path formed by the intersection of the air flow paths in the two directions being 30-90 degrees. And the superfine nanofiber non-woven fabric can be massively produced by using the thermoplastic polymer under the condition of not using a solvent harmful to the environment.

Description

Technical Field

[0001] The present invention relates to a melt - blown electrospinning apparatus for preparing an ultrafine nanofiber non - woven fabric, and more particularly, to an environmentally friendly ultrafine nanofiber non - woven fabric preparation apparatus that does not use a solvent during electrospinning. Background Art

[0002] Recently, due to its wide range of uses, the demand for non - woven fabrics has increased rapidly worldwide, and the demand for ultrafine fiber and nanofiber non - woven fabrics has further increased.

[0003] The preparation technology of such ultrafine nanofiber non - woven fabrics mainly uses the solution electrospinning method. The solution electrospinning method is as follows: after dissolving a polymer in a solvent to form a polymer solution, it is electrospun into a high - voltage electric field formed between a spinning needle and a collecting plate to prepare nanofibers.

[0004] However, this solution electrospinning method has problems in terms of environment and safety, such as requiring a solvent recovery process in the preparation process due to the solvent used, and having a solvent residue problem in the final product.

[0005] On the other hand, a melt electrospinning method for improving the above problems has been proposed, but when a high voltage is applied to the spinning nozzle, insulation problems will occur, and there are also difficulties in maintaining the spinning temperature and heat preservation.

[0006] Moreover, insulation is achieved by forming an insulating layer on the spinning nozzle, but it is difficult to maintain the spinning temperature and the heat preservation of the nozzle surface, which has an adverse effect on the preparation of nanofibers.

[0007] Also, as shown in Korean Patent Publication No. 2012 - 0015655, an attempt was made to easily achieve insulation of the spinning nozzle and heat the melting tank by a gas heating method for the preparation and heat preservation of the melt, but due to the gas heating and circulation device, the device became more complex, and through the experimental device, rather than the roll - to - roll method, it did not achieve its application effect in the mass production of nanofibers.

[0008] Currently, the method for commercially producing nanofiber non - woven fabrics mainly uses the solution electrospinning method, which uses a solution tank and a needle - type spinning nozzle, but there are limitations in the mass production of nanofibers.

[0009] In order to mass - produce nanofibers without using environmentally harmful solvents, the melt - blown electrospinning technology that organically combines the existing electrospinning technology and the melt - blown spinning technology is the most suitable method, but in fact, the research on it is still limited. Summary of the Invention

[0010] Technical problem

[0011] The technical problem to be solved by the present invention is to provide the following device, which maintains the insulation and heat preservation of the spinning nozzle and simultaneously applies a high voltage between the spinning nozzle and the collector to prepare an ultrafine nanofiber non-woven fabric of a thermoplastic polymer without using a solvent harmful to the environment.

[0012] To solve the above technical problem, the present invention provides the following meltblown electrospinning device, which maintains the insulation and heat preservation of the spinning nozzle and uses hot air at high temperature and high voltage to increase the fiberization shear force to promote the nanofiberization of electrospun fibers.

[0013] Technical solution

[0014] To achieve the above object, the meltblown electrospinning device for preparing an ultrafine nanofiber non-woven fabric of the present invention includes: an extruder for preparing a polymer melt; a gear pump for quantitatively transferring the melt from the extruder; a spinning nozzle for discharging the polymer melt transferred from the gear pump; a collector for capturing the spun fibers discharged from the spinning nozzle in a grid state; and a voltage application unit for applying a high voltage between the spinning nozzle and the collector. The spinning nozzle includes: an upper spinning nozzle die provided with a spinning orifice for discharging the polymer melt; and a lower injection nozzle die disposed opposite to the upper nozzle die, provided with air flow paths in two directions and an injection orifice for discharging air and the polymer melt from below the spinning orifice. The angle of the air flow path formed by the intersection of the air flow paths in the two directions is 30 to 90 degrees.

[0015] Moreover, the present invention provides a meltblown electrospinning device for preparing an ultrafine nanofiber non-woven fabric, characterized in that the separation distance e between the spinning orifice of the upper spinning nozzle die and the injection orifice of the lower injection nozzle die is in the range of -10 to 10 mm and satisfies the following formula 1.

[0016] Formula 1

[0017] -10d ≤ e ≤ 10d

[0018] In formula 1, e represents the separation distance between the spinning orifice of the upper spinning nozzle die and the injection orifice of the lower injection nozzle die, and d represents the diameter of the spinning orifice.

[0019] Moreover, the present invention provides a meltblown electrospinning device for preparing an ultrafine nanofiber non-woven fabric, characterized in that the diameter a of the air flow path is in the range of 0.2 to 10 mm and satisfies the following formula 2.

[0020] Formula 2

[0021] 2d ≤ a ≤ 10d

[0022] In Formula 2, a represents the diameter of the air flow path, and d represents the diameter of the spinning orifice.

[0023] Moreover, the present invention provides a meltblown electrospinning device for preparing an ultrafine nanofiber nonwoven fabric, characterized in that the diameter d of the spinning orifice of the upper spinning nozzle die is in the range of 0.1 to 1.0 mm, and the ratio (L / d) of the length L to the diameter d of the spinning orifice is 1 to 40.

[0024] Moreover, the present invention provides a meltblown electrospinning device for preparing an ultrafine nanofiber nonwoven fabric, characterized in that in the upper spinning nozzle die, along the width direction of the spinning nozzle, there are 1 to 50 spinning orifices per inch.

[0025] Moreover, the present invention provides a meltblown electrospinning device for preparing an ultrafine nanofiber nonwoven fabric, characterized in that the upper spinning nozzle die of the spinning nozzle is in a grounded state, and a high voltage is applied to the collector.

[0026] Moreover, the present invention provides a meltblown electrospinning device for preparing an ultrafine nanofiber nonwoven fabric, characterized in that the polarity of the high voltage is positive, and the voltage is about 1 to 200 kV.

[0027] Moreover, the present invention provides a meltblown electrospinning device for preparing an ultrafine nanofiber nonwoven fabric, characterized in that the polarity of the high voltage is negative, and the voltage is about 1 to 200 kV.

[0028] Effects of the Invention

[0029] According to the meltblown electrospinning device for preparing an ultrafine nanofiber nonwoven fabric of the present invention, compared with the existing solution electrospinning method, it does not use solvents harmful to the environment, can use thermoplastic polymers to mass-produce ultrafine nanofiber nonwoven fabrics, and maintains a small angle of the air flow path to obtain nanofibers with a fiber diameter less than 1 μm.

[0030] Moreover, the polymer melt can be quantitatively transferred by using an extruder and a gear pump, the insulation and heat preservation of the spinning nozzle can be maintained, a high voltage is applied between the spinning nozzle and the collector to obtain nanofibers without using harmful solvents, and nanofibers with a fiber diameter of the desired morphology can be obtained by differently forming the separation distance between the spinning orifices, the diameter of the spinning orifices, the angle and diameter of the air flow path, etc.

[0031] The nanofiber nonwoven fabric prepared according to the present invention can be very effectively used for industrial materials, electrical and electronic component materials, separation membrane materials, etc. Brief Description of the Drawings

[0032] Figure 1 It is a schematic diagram of the meltblown electrospinning device of the present invention.

[0033] Figure 2 It is a structural diagram of a spinning nozzle for illustrating the spinning orifice and the ejection orifice of the spinning nozzle. Detailed implementation mode

[0034] To fully understand the present invention, with reference to the accompanying drawings, the preferred embodiments of the present invention will be described.

[0035] The embodiments of the present invention can be deformed into various forms, and the scope of the present invention is not limited to the embodiments described in detail below. These embodiments are provided to more completely describe the present invention to those of ordinary skill in the technical field to which the present invention pertains. The detailed descriptions of well-known functions and structures that are judged to unnecessarily obscure the gist of the present invention will be omitted.

[0036] Refer to Figure 1 , the melt-blowing electrospinning device of the present invention includes: a hopper 10 for supplying polymer chips; an extruder 20 for preparing a polymer melt; a gear pump G / P for quantitatively transferring the melt from the extruder; and a spinning nozzle 101 for discharging the polymer melt transferred from the gear pump G / P.

[0037] Moreover, the present invention includes: a collector 110 for trapping the spun fibers discharged from the spinning nozzle 101 in a grid state; and a high-voltage generating device 120 as a voltage applying unit for applying a high voltage between the spinning nozzle 101 and the collector 110.

[0038] Moreover, an air trapping pipe 114 for sucking and trapping the air discharged from the spinning nozzle 101 is provided in the collector 110, and an air suction device 112 for sucking and discharging the trapped air is connected to the air trapping pipe 114.

[0039] Moreover, the spinning nozzle 101 includes: an upper spinning nozzle mold 102 provided with a spinning orifice 104 for discharging the polymer melt; and a lower ejection nozzle mold 103 disposed opposite to the upper nozzle mold 102 and provided with an air flow path and an ejection orifice 106 for discharging air and the polymer melt from below the spinning orifice.

[0040] Moreover, in this device, an air compression and blowing device 109 for supplying air for supplying high-temperature and high-voltage air and a heater 108 (Heat Tank) for heating the air are connected to the air flow path of the spinning nozzle 101.

[0041] The melt-blowing electrospinning device, as a device for implementing the melt-blowing electrospinning method, means a spinning method that combines melt-blowing and electrospinning. In this case, the melt-blowing electrospinning method can be used in a concept similar to the melt electrospray spinning method.

[0042] The air flow path angle α formed by the intersection of the air flow paths in two directions of the spinning nozzle of the meltblown electrospinning device can be 30 to 90 degrees (°), preferably 30 to 60 degrees.

[0043] During the process of preparing ultrafine nanofibers by hot air at high temperature and high voltage, the air flow path angle α plays an important role.

[0044] The smaller the air flow path angle, the greater the fiberization shear force of the hot air based on high temperature and high voltage, thus presenting a favorable result for the preparation of nanofibers.

[0045] Moreover, the spinning orifice can be moved inward toward the injection orifice at a certain distance, so that the heat preservation of the discharged polymer becomes simple, which is more favorable for the preparation of nanofibers.

[0046] However, when the air flow path angle is too small, less than 30 degrees, the processing cost will increase and the durability of the spinning nozzle will be reduced.

[0047] Therefore, when the air flow path angle is 30 to 90 degrees, it is favorable in terms of processing cost and durability. Preferably, better results are obtained when the air flow path angle is 30 to 60 degrees.

[0048] The present invention can be a meltblown electrospinning device for preparing ultrafine nanofiber nonwoven fabric, wherein the separation distance e between the spinning orifice of the upper spinning nozzle die 102 and the injection orifice of the lower injection nozzle die 103 is in the range of -10 to 10 mm, preferably in the range of -5 to 5 mm, and satisfies the following formula 1.

[0049] Formula 1

[0050] -10d ≤ e ≤ 10d

[0051] In formula 1, e represents the separation distance between the spinning orifice of the upper spinning nozzle die and the injection orifice of the lower injection nozzle die, and d represents the diameter of the spinning orifice.

[0052] When the spinning orifice 104 of the upper spinning nozzle die 102 rises inward toward the injection orifice 106 of the lower injection nozzle die 103, it is expressed as a negative (-) distance. When the spinning orifice 104 of the upper spinning nozzle die 102 protrudes downward from the injection orifice 106 of the lower injection nozzle die 103, it is expressed as a positive (+) distance.

[0053] The closer the separation distance of the spinning orifice 104 moves inward toward the injection orifice 106 of the lower nozzle die 103, the more favorable it is for the heat preservation of the polymer and the maintenance of the spinning temperature, and ultimately nanofibers with a smaller fiber diameter can be prepared.

[0054] Moreover, the separation distance of the spinning orifice 104 depends on the diameter d of the polymer spinning orifice, and when the formula 1 is satisfied, it is beneficial for the preparation of nanofibers.

[0055] The smaller the diameter of the spinning orifice 104, the smaller the range of the separation distance of the spinning orifice, and the larger the diameter of the spinning orifice 104, the larger the range of the separation distance of the spinning orifice.

[0056] Moreover, when the separation distance of the spinning orifice enters the inner side of the ejection orifice 106, the separation distance of the spinning orifice has a dependence on the diameter of the spinning orifice, and the distance should be limited. That is, the smaller the diameter of the spinning orifice, the smaller the separation distance of the spinning orifice.

[0057] The closer the separation distance of the spinning orifice is to the inner side of the ejection orifice, the more favorable it is in terms of heat preservation, but the interference between adjacent spinning orifices and the electric field concentration at the front end of the nozzle are hindered, thereby having an adverse effect on the nanofibrillation of the discharged polymer.

[0058] Moreover, when the separation distance of the spinning orifice protrudes to the outer side of the ejection orifice, the separation distance of the spinning orifice has a dependence on the diameter of the spinning orifice, and the distance should be limited. That is, the smaller the diameter of the spinning orifice, the smaller the separation distance of the spinning orifice.

[0059] This is because the larger the separation distance of the spinning orifice protruding to the outer side of the ejection orifice, the more difficult it is to achieve heat preservation of the discharged polymer, thereby hindering the nanofibrillation of the discharged polymer.

[0060] As described above, when the nanofibrillation of the spun fiber and the spinning workability are not hindered, the smaller the separation distance of the spinning orifice, the more favorable it is.

[0061] The present invention can be a meltblown electrospinning device for preparing an ultrafine nanofiber nonwoven fabric, wherein the diameter a of the air flow path is in the range of 0.2 to 10 mm, preferably in the range of 0.2 to 5.0 mm, and satisfies the following formula 2.

[0062] Formula 2

[0063] 2d ≤ a ≤ 10d

[0064] In formula 2, a represents the diameter of the air flow path, and d represents the diameter of the spinning orifice.

[0065] The diameter of the air flow path depends on the diameter of the spinning orifice. The larger the diameter of the spinning orifice, the larger the diameter of the air flow path will be.

[0066] The present invention may be a melt - blown electrospinning device as follows. Among them, the diameter d of the spinning orifice 104 of the upper spinning nozzle die 102 is in the range of 0.1 - 1.0 mm, and the ratio L / d of the length L to the diameter d of the spinning orifice 104 is 1 - 40. Preferably, the diameter d of the spinning orifice is 0.1 - 0.5 mm, and the ratio L / d of the length L to the diameter d of the spinning orifice is 5 - 20.

[0067] In the case where the diameter d of the spinning orifice is less than 0.1 mm or the ratio L / d of the length L to the diameter d of the spinning orifice is greater than 40, the processing of the spinning orifice 104 becomes difficult and is also disadvantageous in terms of processing cost. Furthermore, when spinning, the phenomenon of clogging of the spinning orifice is aggravated, the uniformity of the nano - net is reduced, and adverse problems are caused in terms of spinning workability.

[0068] For the upper spinning nozzle die 102 of the melt - blown electrospinning device, along the width direction of the spinning nozzle 101, there may be 1 - 50 spinning orifices 104 per inch. Preferably, there may be 2 - 20 spinning orifices 104 per inch.

[0069] When the number of the spinning orifices 104 increases excessively, interference will occur in the spinning of adjacent spinning orifices during spinning, thus having an adverse impact on the preparation of nanofibers.

[0070] In the melt - blown electrospinning device, the upper spinning nozzle die 102 of the spinning nozzle 101 is grounded, and a high voltage is applied to the collector 110 by the high - voltage generating device 120.

[0071] An electric field based on a high voltage is applied between the spinning nozzle 101 and the collector 110 to perform electrospinning. In this case, when a high voltage is applied to the spinning nozzle 101, it is necessary to form a separate insulating material layer to prevent damage to electrical devices such as the extruder 20 caused by the high voltage. However, in this case, it is difficult to achieve heat preservation of the polymer due to the insulating material layer, and adverse problems also occur in maintaining the spinning temperature.

[0072] The polarity of the high voltage may be positive, and the voltage may be about 1 - 200 kV. Preferably, it may be 5 - 100 kV. In the case where the voltage is greater than 200 kV, it becomes difficult to achieve insulation, and it has an impact on the surrounding electrical devices, resulting in device failure.

[0073] The polarity of the high voltage may be negative, and the voltage may be about 1 - 200 kV. Preferably, it may be 5 - 100 kV. In the case where the voltage is greater than 200 kV, it becomes difficult to achieve insulation, and it has an impact on the surrounding electrical devices, resulting in device failure.

[0074] The polymers of the present invention can be polypropylene, polyethylene, polytetrafluoroethylene, polyester, polyamide, polyacrylonitrile, polyurethane, polyvinyl alcohol, and thermoplastic polymers can be used without limitation. Among these thermoplastic polymers, polypropylene can be suitably used in terms of price or stability.

[0075] Hereinafter, the present invention will be described in detail by way of examples.

[0076] However, the following examples are merely illustrative of the present invention, and the content of the present invention is not limited to the following examples.

[0077] <Example 1>

[0078] As a thermoplastic polymer, after preparing a spinning melt by supplying polypropylene (PP) chips with a melt flow index (MI) of 1400 to an extruder 20 through a hopper 10, the spinning melt was quantitatively transferred to a Figure 1 spinning nozzle 101 by a gear pump G / P. Then, the spinning melt was melt-blown onto a collector 110 with a + electrode through an upper spinning nozzle die 102 and a lower injection nozzle die 103 inside the grounded spinning nozzle 101 to prepare a nanofiber nonwoven fabric.

[0079] In this case, the melt-blowing electrospinning device used in the example was Figure 1 a blade-shaped spinning nozzle with an air flow path angle α of 60 degrees (°). In this case, the diameter of the used spinning nozzle 101 was 0.25 mm, the L / d of the spinning nozzle was 10, the number of spinning orifices of the spinning nozzle was 10 per inch, the air gap as the diameter of the air flow path was 1.50 mm, and the separation distance of the spinning orifices was -0.5 mm.

[0080] Moreover, the process conditions were as follows: the temperatures of the extruder 20 and the spinning nozzle die were adjusted, and the room temperature was adjusted to 270 °C. The die-to-collector distance (DCD), which is the distance between the spinning nozzle die and the collector 110, was adjusted to 200 mm. The air volume of the heated air in the air flow path (air injection port) was 8 m 3 / min, the wind speed was 28 kPa, and the temperature of the heated air was 250 °C. A nanofiber nonwoven fabric with a basis weight of 10 gsm (g / m 2 ) was prepared in this way. In this case, a high voltage of 60 kV was applied to the collector 110 by a high voltage generating device 120. The average fiber diameter of the prepared nonwoven fabric is shown in Table 1 below.

[0081] <Examples 2 - 3>

[0082] Prepared in the same manner as in Example 1, except that the distances between the spinning orifices were changed to 0 mm and +0.5 mm, respectively.

[0083] <Examples 4 - 9>

[0084] Prepared in the same manner as in Example 1, except that the air flow path angle and the distances between the spinning orifices were changed as shown in Table 1 below.

[0085] <Comparative Example 1>

[0086] Prepared in the same manner as in Example 1, except that the air flow path angle and the distances between the spinning orifices were changed as shown in Table 1 below.

[0087] <Experimental Example 1>

[0088] The following physical properties of the nanofiber nonwoven fabrics prepared in Examples 1 - 9 and Comparative Example 1 were evaluated and presented in Table 1 below.

[0089] 1) Average fiber diameter

[0090] Circular samples with a diameter of 10 cm were cut from a total of 3 positions, namely the left, right, and middle positions of the prepared nanofiber nonwoven fabric, and surface scanning electron microscope (SEM) photos of each sample were taken to measure the fiber diameter. Ten fiber diameters were measured for each sample, and the average fiber diameter was calculated and labeled in nanometers (nm). In this case, truncation was performed to the units place to reduce measurement errors.

[0091] 2) Comprehensive evaluation

[0092] The fiber diameter physical properties of the nanofiber nonwoven fabrics prepared in Examples 1 - 9 and Comparative Example 1 were measured and evaluated. When the average fiber diameter was less than 900 nm, it was judged as good (○); when the average fiber diameter was less than 900 - 1200 nm, it was judged as fair (△); when the average fiber diameter was 1200 nm or more, it was judged as poor (×).

[0093] Table 1

[0094]

[0095] *Explanation of the symbols for the distances between the spinning orifices

[0096] When the separation distance of the spinning orifice is negative (-), it means that the spinning orifice enters the inside of the ejection port 106 of the lower ejection nozzle die 103, that is, it enters inward. When the separation distance of the spinning orifice is 0, it means that the spinning orifice 104 is located at the same plane position as the ejection port of the lower ejection nozzle die 103. When the separation distance of the spinning orifice is positive (+), it means that the spinning orifice 104 protrudes outward from the ejection port of the lower ejection nozzle die 103, that is, it protrudes outward.

[0097] As shown in Table 1, when the air flow path angle is 60 degrees, it can be known that an ultrafine nanofiber nonwoven fabric with an average fiber diameter of 900 nm or less can be prepared.

[0098] Furthermore, when the air flow path angle is 30 degrees, it can be confirmed that an ultrafine nanofiber nonwoven fabric with a smaller average fiber diameter can be prepared.

[0099] It can be known that the average nanofiber diameter increases when the air flow path angle is 90 degrees compared to the cases where the air flow path angles are 30 degrees and 60 degrees.

[0100] This phenomenon can be evaluated as follows: the smaller the air flow path angle, the greater the fibrillating shear force based on the ejected air, thereby promoting the formation of nanofibers.

[0101] Moreover, when the spinning orifice 104 protrudes outward from the ejection port 106 of the lower ejection nozzle die 103, the electric field based on the high voltage applied between the spinning nozzle 101 and the collector 110 easily concentrates at the tip of the nozzle, thereby promoting nanofibrillation.

[0102] On the other hand, it can be known that when the air flow path angle is small, nanofibers can also be prepared when the separation distance of the spinning orifice enters the inside of the ejection port.

[0103] In addition, when the separation distance of the spinning orifice protrudes outward from the ejection port, the separation distance of the spinning orifice depends on the diameter of the spinning orifice, and this distance should be limited.

[0104] That is, the smaller the diameter of the spinning orifice, the smaller the separation distance of the spinning orifice should be. This is because the larger the separation distance of the spinning orifice, the more difficult it is to maintain the temperature of the discharged polymer, thus becoming a factor that hinders the nanofibrillation of the discharged polymer.

[0105] As described above, when there is no hindrance to the nanofibrillation of the spun fibers and the spinning workability, it may be more advantageous to maintain a smaller separation distance of the spinning orifice.

[0106] It can be understood that in Comparative Example 1 where the air flow path angle is 100 degrees, the average fiber diameter greatly exceeds 1000 nm, and the fiber diameter distribution also increases. This phenomenon is evaluated as being caused by a large air flow path angle, resulting in a reduction in the fibrillation shear force based on the ejected air and an increase in the air interference with adjacent spinnerets.

Claims

1. A melt - blown electrospinning device for preparing ultrafine nanofiber non - woven fabric, characterized in that, It includes: An extruder for preparing a polymer melt; A gear pump for quantitatively transferring the melt from the extruder; A spinning nozzle for discharging the polymer melt transferred from the gear pump; A collector for capturing the spun fibers discharged from the spinning nozzle in a grid state; and A voltage application unit for applying a high voltage between the spinning nozzle and the collector, The spinning nozzle includes: An upper spinning nozzle die provided with a spinning orifice for discharging the polymer melt; and A lower injection nozzle die arranged opposite to the upper nozzle die, provided with air flow paths in two directions and an injection orifice for discharging air and the polymer melt from the lower part of the spinning orifice, The angle of the air flow path formed by the intersection of the air flow paths in two directions is 30 degrees to 90 degrees.

2. The melt-blowing electrospinning device for preparing the ultrafine nanofiber nonwoven fabric according to claim 1, wherein The separation distance (e) between the spinning orifice of the upper spinning nozzle die and the injection orifice of the lower injection nozzle die is in the range of - 10 mm to 10 mm and satisfies the following formula 1, Formula 1 - 10d ≤ e ≤ 10d In formula 1, e represents the separation distance between the spinning orifice of the upper spinning nozzle die and the injection orifice of the lower injection nozzle die, and d represents the diameter of the spinning orifice.

3. The meltblown electrostatic spinning device for preparing the ultrafine nanofiber nonwoven fabric according to claim 1, wherein, The diameter (a) of the air flow path is in the range of 0.2 mm to 10 mm and satisfies the following formula 2, Formula 2 2d ≤ a ≤ 10d In formula 2, a represents the diameter of the air flow path, and d represents the diameter of the spinning orifice.

4. The melt-blowing electrospinning device for preparing the ultrafine nanofiber nonwoven fabric according to claim 1, wherein, The diameter (d) of the spinning orifice of the upper spinning nozzle die is in the range of 0.1 mm to 1.0 mm, and the ratio (L / d) of the length (L) to the diameter (d) of the spinning orifice is 1 to 40.

5. The meltblown electrospinning device for preparing the ultrafine nanofiber nonwoven fabric according to claim 1, characterized in that, In the upper spinning nozzle die, along the width direction of the spinning nozzle, there are 1 to 50 spinning orifices per inch.

6. The meltblown electrospinning device for preparing the ultrafine nanofiber nonwoven fabric according to claim 1, wherein, The upper spinning nozzle die of the spinning nozzle is grounded, and a high voltage is applied to the collector.

7. The meltblown electrospinning device for preparing the ultrafine nanofiber non-woven fabric according to claim 6, wherein, The polarity of the high voltage is positive, and the voltage is about 1 kV to 200 kV.

8. The melt - blown electrospinning device for preparing ultrafine nanofiber non - woven fabric according to claim 6, characterized in that, The polarity of the high voltage is negative, and the voltage is about 1 kV to 200 kV.

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