WO2020111299A1 - Electrospinning device for uniform spinning of polymer nanomaterials using moving charges - Google Patents

Abstract

The present invention relates to an electrospinning device for the uniform spinning of polymer nanomaterials using moving charges, the electrospinning device being characterized by comprising: a spinning nozzle through which a spinning solution made of polymer nanomaterials is discharged; a collector in which the spinning solution, made of polymer nanomaterials and discharged from the spinning nozzle, is collected as nanofibers; and a power supply unit for applying power to the spinning nozzle and the collector. The collector includes a base layer in which the nanofibers are collected in a web state, and a plurality of conductive dots arranged in a plurality of rows and a plurality of columns on the bottom surface of the base layer. The electrospinning device is also provided with a relay for selectively applying the power, applied from the power supply unit, to the plurality of conductive dots.

Description

Electrospinning device for uniform emission of polymer nanomaterials using moving charge

The present invention relates to an electrospinning device for uniform spinning of polymer nanomaterials using moving charges. Particularly, polymers using moving charges capable of producing nanowebs with improved uniformity by precisely controlling the arrangement of nanofibers during electrospinning. It relates to an electrospinning device for uniform radiation of nanomaterials.

In general, nano-fibers have characteristics such as an ultra-high specific surface area effect, a nano-size effect, and a super-molecular alignment effect, and thus are emerging as a next-generation high-performance high-tech new material. Nano-fibers are used in various technical fields such as electronics, environment, energy, biotechnology, and defense.

Methods of manufacturing nanofibers include drawing, template synthesis, phase separation, self assembly, and electrospinning. Among these, an electrospinning method is generally used as a method for continuously producing nanofibers.

The electrospinning method consists of three parts: a discharge part that supplies a spinning solution made of a polymer nanomaterial, a voltage generator for forming an electric field, and a collector that stacks nanofibers. When is applied, a charge is induced to the liquid surface of the polymer solution formed at the end of the spinneret by surface tension, and a force due to mutual repulsion of the induced charge is generated in the opposite direction to the surface tension. At this time, when a threshold voltage exceeding the surface tension of the polymer solution drop is applied, a jet of polymer solution charged by electric repulsion is released. While the jet flies in the air, it is finely torn and fiberized, and the solvent is volatilized, so that ultrafine fibers are collected on the collector. It is a form in which a laminated nonwoven web is made.

The electrospun nanofibrous web formed as described above is made of a fiber aggregate having a nano-range diameter to realize a soft and soft touch, and has the characteristics of ultra-thin ultra-light weight.

In addition, due to the numerous micro-pore structures, it has respirability, so it exhibits air permeability and air permeability to discharge water vapor or sweat inside, and it has many spaces that can contain air, so it also has the advantage of heat retention.

These electrospinning nanofiber webs can be made of a variety of polymers and can control the properties of the final product by adjusting the diameter, surface pore structure and porosity cross-section structure of the fiber. , Environmental engineering and energy storage devices are being tried in various fields.

Meanwhile, in order to improve the quality of the nanoweb, various electrospinning methods have been proposed, such as patent document 0001 (KR 10-1601169 B1 (2016.03.02)).

Patent document 0001 is that the electrospinning apparatus is disposed between a spinning nozzle having a plurality of needles that emit nanofibers, and a spinning nozzle arranged in a number of rows to inject air that is constantly temperature-humidified and directly into the nanofibers emitted from the spinning nozzle It consists of a constant temperature and humidity unit, a frame in which the spinning nozzle and the constant temperature and humidity unit are alternately fixed, and a collector disposed under the spinning nozzle and collecting nanofibers to form a nano web, thereby improving the quality of the nano web. It is possible to reduce the cost because there is no need to constant-humidify the entire chamber.

However, Patent Document 001 has a limitation in manufacturing a nanoweb having excellent uniformity, as the nanofiber has a disordered structure because the polymer solution is sprayed irregularly from the nozzle like a conventional electrospinning device.

The present invention for solving such a conventional problem is to precisely control the arrangement of the nanofibers during electrospinning to achieve an electrospinning device for uniform spinning of polymer nanomaterials using a moving charge capable of manufacturing a nanoweb with improved uniformity. Its purpose is to provide.

The present invention for achieving the above object,

A spinning nozzle from which a spinning solution made of a polymer nanomaterial is discharged, a collector from which a spinning solution made from a polymer nanomaterial discharged from the spinning nozzle is collected as nanofibers, and a power supply unit for applying power to the spinning nozzle and the collector Including,

The collector includes a substrate layer in which nanofibers are collected in a web state, and a plurality of conductive dots arranged in a plurality of rows and columns on the rear surface of the substrate layer,

It provides an electrospinning device for uniform emission of a polymer nanomaterial using a moving charge, characterized in that a relay for selectively applying the power applied from the power supply to the plurality of conductive dots.

In addition, a non-conductive plate is provided on the rear surface of the base layer of the collector, and the plurality of conductive dots may be formed on the non-conductive plate.

In addition, a non-conductive gap holding member may be interposed between the plurality of conductive dots in the horizontal direction. Particularly, a non-conductive gap holding member may be interposed between the plurality of conductive dots in the vertical direction.

In addition, it is preferable that a control unit for controlling the relay is provided so as to sequentially apply power to a plurality of conductive dots in one row or in one row. In particular, the control unit controls the relay so as to sequentially apply the plurality of conductive dots of the plurality of rows in a zigzag form from the top to the bottom, and the plurality of conductive dots in the plurality of rows are zigzag in one direction to the other. It is preferable to control the relay to apply sequential power.

It is preferable that the rim of the collector is fixed with a non-conductive frame.

As the electrospinning device for uniform emission of polymer nanomaterials using the moving charge of the present invention discharges a spinning solution made of polymer nanomaterials through a spinning nozzle while selectively or sequentially applying power to a plurality of conductive dots There is an effect that a nanofiber web with uniformity is improved by uniformly collecting nanofibers over the entire base layer of the collector.

1 is a view schematically showing the configuration of an electrospinning apparatus for uniform spinning of a polymer nanomaterial using the moving charge of the present invention.

2 is a front view schematically showing the front state of the collector.

3 is a partially enlarged front view schematically showing a state in which a non-conductive gap holding member is interposed in a horizontal direction between a plurality of conductive dots,

4 is a partially enlarged front view schematically showing a state in which a non-conductive gap holding member is interposed in a vertical direction between a plurality of conductive dots.

5 is a block diagram schematically showing an electrospinning device for uniform spinning of a polymer nanomaterial using a moving charge.

6 is a view schematically showing a state in which power is sequentially supplied to a plurality of rows of conductive dots in a zigzag form,

7 is a view schematically showing a state in which power is sequentially supplied to a plurality of rows of conductive dots in a zigzag form.

The embodiments of the electrospinning apparatus for uniform spinning of the polymer nanomaterial using the moving charge of the present invention will be described in detail with reference to the drawings, and the scope of the present invention is not limited to the following embodiments.

1 is a view schematically showing the configuration of an electrospinning apparatus for uniform spinning of a polymer nanomaterial using the moving charge of the present invention.

The electrospinning device for uniform spinning of the polymer nanomaterial using the moving charge of the present invention largely includes a radiation nozzle 10, a collector 20, a power supply device 30, and a relay 40.

The spinning nozzle 10 is for forming a nanofiber web by spinning a spinning solution made of a polymer nanomaterial by the high voltage electrostatic force to the collector 20, and the spinning nozzle is a general electrospinning, air electrospinning ( AES: Air-Electrospinning, electrospray, electrobrown spinning, centrifugal electrospinning, or flash-electrospinning can be used.

The spinning nozzle 10 is supplied with a spinning solution made of a polymer nanomaterial by a mixing tag in which a polymer material and a solvent are mixed and stored, and the + pole of the power supply device 30 is connected.

2 is a front view schematically showing the front state of the collector.

In addition, the collector 20 is connected to the pole of the power supply device 30, and a spinning solution made of a polymer nanomaterial discharged from the spinning nozzle 10 is collected as nanofibers to form a nanofiber web.

The collector 20 has a plurality of conductive dots 230 arranged in a plurality of rows and a plurality of rows on the back surface of the base layer 210 and the base layer 210, the nanofibers are collected in a web state as shown in Figure 2 It is configured to include.

The plurality of conductive dots 230 are connected to the pole of the power supply device 30 through the relay 40.

The plurality of conductive dots 230 may be formed and arranged on the non-conductive plate 242 disposed on the rear surface of the base layer 210 of the collector 20 as shown in FIGS. 1 and 2.

3 is a partially enlarged front view schematically showing a state in which a non-conductive gap holding member is interposed in a horizontal direction between a plurality of conductive dots, and FIG. 4 is a non-conductive gap holding member interposed in a vertical direction between a plurality of conductive dots It is a partially enlarged front view schematically showing the state.

In addition, the plurality of conductive dots 230 may be formed in a horizontal bar shape by being coupled in the horizontal direction by the non-conductive gap holding member 244 as shown in FIG. 3. That is, as shown in Figure 3, the non-conductive gap holding member 244 is interposed in the horizontal direction between the plurality of conductive dots 230, respectively, and is formed in the form of a horizontal bar, and both ends are attached to the frame 250. It can be fixedly installed.

In addition, the plurality of conductive dots 230 may be formed in a vertical bar shape by being coupled in the vertical direction by the non-conductive gap holding member 246 as shown in FIG. 4. That is, as shown in FIG. 4, the non-conductive gap holding member 244 is interposed in the vertical direction, and is formed in the form of a vertical bar between the plurality of conductive dots 230, and the upper and lower parts of the frame 250 ).

And the rim of the collector 20 is fixed to the non-conductive material frame 250 as shown in FIG. 1. As the frame 250 of the non-conductive material is fixed to the rim of the collector 20, there is an advantage in that nanofibers are collected only in the base layer 210 to obtain a nanofiber web with improved uniformity.

5 is a block diagram schematically showing an electrospinning device for uniform spinning of a polymer nanomaterial using a moving charge.

And the power supply 30 is for forming an electric field between the radiation nozzle 10 and the collet, and the + electrode of the power supply 30 is connected to the radiation nozzle 10 ,-The electrode is connected to the plurality of conductive dots 230 through the relay 40.

The power supply 30 usually applies a voltage in the range of 10 to 100kV.

Next, the relay 40 selectively applies power applied from the power supply to the plurality of conductive dots 230.

The relay 40 is controlled by the control unit 50. The controller 50 controls the relay 40 to sequentially apply power to a plurality of conductive dots 230 in any one column or row.

In this case, the relay 40 sequentially applies the power applied from the power supply unit to the plurality of conductive dots 230 so that the nanofibers are from the one side to the other side on the base layer 210 of the collector 20. By uniformly collecting from the bottom to the, it is possible to obtain a nanofiber web uniformly dispersed throughout.

6 is a view schematically showing a state in which power is sequentially supplied in a zigzag form to a plurality of rows of conductive dots, and FIG. 7 is a schematic view showing a state in which power is sequentially supplied in a zigzag form to a plurality of rows of conductive dots. It is a drawing.

Referring to FIG. 6, a method in which the controller 50 sequentially controls the conductive dots of a plurality of rows constituting the plurality of conductive dots 230 disposed in the collector 20 in the zigzag form through the relay 40. It is described as follows. First, power is sequentially applied to the conductive dots 230A1 of the first column located on the uppermost side from one side to the other. At this time, the application of the power of the first row of conductive dots 230A1 is,'The first row of conductive dots 1 (230A1a) is powered for a certain period of time → The first row of conductive dots 1 (230A1a) is turned off and the first row of conductive dots 2 (230A1b) power is applied for a certain period of time → the first row of conductive dots 2 (230A1b) is powered off, and the first row of conductive dots 3 (230A1c) is powered for a certain time. 'In order. Next, the second row of conductive dots 230A2 are sequentially applied from one side to the other, and then the third row of conductive dots 230A3 are sequentially applied from one side to the other.

As described above, when the controller 50 controls the relay 40 and sequentially applies power to the conductive dots of the plurality of rows in a zigzag form, it is possible to obtain a plurality of horizontal line-shaped nanofiber webs at regular intervals.

7 illustrates a method in which the control unit 50 sequentially controls the conductive dots of the plurality of rows constituting the plurality of conductive dots 230 disposed in the collector 20 in the zigzag form through the relay 40. The explanation is as follows with reference. First, power is sequentially applied to the conductive dots 230B1 of the first row located on one side from the upper side to the lower side. At this time, the application of the power of the conductive dot 230B1 in the first row is'power applied to the conductive dot 1 (230B1a) in the first row for a predetermined time → the first row simultaneously with the power supply of the conductive dot 1 (230B1a) in the first row is cut off. Power supply of the conductive dots 2 (230B1b) for a period of time → power supply of the conductive dots 3 (230B1c) of the first row for a period of time at the same time as the power supply of the conductive dots 2 (230B1b) of the first row is cut off. 'In order. Next, power is sequentially applied from the lower side to the upper side of the conductive dot 230B2 in the second row, and then power is sequentially applied from the upper side to the lower side in the downward direction from the upper side.

As described above, when the controller 50 controls the relay 40 and sequentially applies power to the conductive dots of the plurality of rows in a zigzag form, it is possible to obtain a plurality of vertical line-shaped nanofiber webs at regular intervals.

As a result, it is possible to obtain a lattice-shaped nanofiber web with greatly improved uniformity on the base layer 210 of the collector 20.

As the electrospinning device for uniform emission of polymer nanomaterials using the moving charge of the present invention discharges a spinning solution made of polymer nanomaterials through a spinning nozzle while selectively or sequentially applying power to a plurality of conductive dots There is an effect that a nanofiber web with uniformity is improved by uniformly collecting nanofibers over the entire base layer of the collector.

Claims (8)

A spinning nozzle from which a spinning solution made of a polymer nanomaterial is discharged, a collector from which a spinning solution made from a polymer nanomaterial discharged from the spinning nozzle is collected as nanofibers, and a power supply unit for applying power to the spinning nozzle and the collector Including, The collector includes a substrate layer in which nanofibers are collected in a web state, and a plurality of conductive dots arranged in a plurality of rows and columns on the rear surface of the substrate layer, An electrospinning device for uniform emission of polymer nanomaterials using moving charges, characterized in that a relay for selectively applying power applied from the power supply unit to the plurality of conductive dots is provided. According to claim 1, A non-conductive plate is provided on the rear surface of the base layer of the collector, The plurality of conductive dots are formed on the non-conductive plate, an electrospinning device for uniform spinning of polymer nanomaterials using moving charges. According to claim 1, An electrospinning device for uniform spinning of polymer nanomaterials using moving charges, characterized in that non-conductive gap holding members are interposed in the horizontal direction between the plurality of conductive dots. According to claim 1, An electrospinning device for uniform spinning of polymer nanomaterials using moving charges, wherein a non-conductive gap holding member is interposed in the vertical direction between the plurality of conductive dots. According to claim 1, An electrospinning device for uniform emission of polymer nanomaterials using moving charge, characterized in that a control unit is provided to control the relay to sequentially apply power to any one row or a plurality of conductive dots in one row in either direction. . The method of claim 5, The control unit controls the relay to apply sequential power in a zigzag form from the top to the bottom of the plurality of conductive dots in the plurality of rows. The electrospinning apparatus for uniform spinning of polymer nanomaterials using moving charges. The method of claim 5, The control unit controls the relay to apply sequential power in a zigzag form from one side to the other in a plurality of conductive dots in the plurality of rows. The electrospinning apparatus for uniform emission of polymer nanomaterials using moving charges. According to claim 1, The collector's rim is an electrospinning device for uniform spinning of polymer nanomaterials using moving charges, characterized in that it is fixed with a frame of non-conductive material.

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