KR20110077915A - Method for controlling electrospinning conditions of a electrospinning device - Google Patents

Abstract

PURPOSE: A spinning condition control method of electrospinning apparatus is provided to manufacture various functionality web without changing arbritrary locations and angles of a spinning nozzle block by modify voltage authorization location and intensity and by forming a uniform electric field accompanied with directionality. CONSTITUTION: The spinning condition control method of electrospinning apparatus is as follows. A nozzle block includes a plurality of nozzles. An aggregation direction of a fiber controls a permit direction of the voltage applied in each nozzle block by adjusting it. A fineness of the spinning fiber controls intensity of the voltage applied in each nozzle block.

Description

TECHNICAL FOR CONTROLLING ELECTROSPINNING CONDITIONS OF A ELECTROSPINNING DEVICE}

The present invention relates to a method for controlling the radiation condition of the electrospinning apparatus, and more particularly, by electrospinning by controlling the direction of voltage application and / or the applied voltage intensity in electrospinning in the electrospinning apparatus without physical modification of the electrospinning apparatus. The present invention relates to a radiation condition control method of an electrospinning apparatus capable of manufacturing a web of various functionalities.

Electrospinning (Electrospinning) is a technology for producing a fine diameter fiber by spinning the spinning material in a charged state, recently used as a technology for manufacturing nanometer-class fibers, and research on this is being actively conducted. This electrospinning method discharges charged radiation material into the air through the spinning nozzle into the air between two electrodes having opposite polarities in which one electrode is located in the radiation nozzle block and the other electrode is located in the collector. It is a method for producing ultrafine fibers after stretching. In other words, the charged discharge filaments are miniaturized in the electric field formed between the nozzle and the collector.

Fibers produced by electrospinning have a diameter ranging from micrometers to nanometers, which in turn exhibits completely new properties. For example, an increase in the ratio of the surface area to the volume, an improvement in surface functionality, and an improvement in mechanical properties including tension. These superior properties make nanofibers applicable to many important applications. For example, the web composed of such nanofibers is a membrane-type material having a porosity, and can be applied to various fields such as various filters, wound dressings, artificial supports, and the like.

The spinning solution or the melt of the polymer polymer in which the polymer polymer solution is dissolved in a solvent is spun in a spinning nozzle block having a spinning nozzle, and then focused on a collector to form a nanofiber web. In general, industrial-scale electrospinning devices include a plurality of spinning nozzle blocks, and each nozzle block includes tens or thousands of spinning nozzles. However, high voltages applied to dozens or thousands of spinning nozzles may cause non-uniformity of physical properties of the nanofiber webs integrated in the collector due to the non-uniformity of the voltages formed between the spinning nozzles. In addition, since the position and angle of the spinning nozzle block of the large-scale spinning apparatus must be changed for uniform web manufacturing, there is a problem in that the process conditions cannot be flexibly changed and nanowebs of various functionalities cannot be manufactured.

The present invention is to solve the problems of the prior art as described above, one object of the present invention is to provide a direction by varying the position and intensity of voltage application without changing the arbitrary position, angle of the radiation nozzle block in the electrospinning apparatus By providing a uniform electric field to provide a radiation condition control method in an electrospinning apparatus that can produce a variety of functional web.

Another object of the present invention is to provide a high voltage application method in a spinning nozzle block which can produce the physical properties of the web uniformly or functionally.

One aspect of the present invention for achieving the above object is a voltage applied to each nozzle block in the electrospinning to produce a nanoweb in an electrospinning apparatus comprising a plurality of nozzle blocks comprising a plurality of nozzles Electrospinning comprising the steps of controlling the integration direction of the fiber by adjusting the direction of application of the fiber and the fineness of the spinning fiber by adjusting the intensity of the voltage applied to each nozzle block The present invention relates to a method for controlling the radiation condition of a device.

In one embodiment of the present invention, by controlling the voltage application direction for the nozzle block, the integration direction of the collector of the electrospun fibers can be controlled, and the voltage application direction is set in a direction opposite to the integration direction of the desired fiber.

On the other hand, by adjusting the intensity of the voltage applied to the electrospinning device by the high voltage generator, it is possible to control the fineness of the electrospun fibers, in one or more nozzle blocks arranged in series, which is applied to each of the plurality of nozzle blocks By varying the strength of the voltage, the fibers of the three fine islands and the fibrous islands are simultaneously radiated to selectively bond the fibers.

When applying the method of the present invention by forming a uniform electric field accompanied by directionality by varying the position and intensity of voltage application without changing the arbitrary position, angle of the radiation nozzle block that has been used previously for uniform web manufacturing One web can be made. In addition, the selective bonding of the fibers is also possible to produce a functional web that can improve the strength, elongation and the like.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, a detailed description of known general functions or configurations will be omitted.

In the present specification, the nozzle block means a unit formed by aligning one or more nozzles. Electrospinning for mass production is such that spinning solution or spinning melt is electrospun into the collector from a plurality of nozzle blocks arranged in a uniform fashion so that the nanofiber web can be continuously produced.

Specifically, the method of controlling the radiation condition of the electrospinning apparatus of the present invention relates to a method of applying a high voltage to a spinning nozzle block. The physical properties of the web can be uniformly or functionally produced according to a method of applying a high voltage. have.

The electric field formation varies depending on the position at which the high voltage is applied to the spinning nozzle block, and the direction of integration of the fibers integrated in the collector tends to bend in a direction opposite to the direction in which the voltage is applied. This phenomenon is more pronounced as the voltage intensity increases. The present invention solves the problem of non-uniformity of the thickness of the web by variously adjusting the position where the voltage is applied in view of this point, and selectively combines the fibers to produce a functional web with improved strength, elongation and the like.

Radiation condition control method of the electrospinning apparatus of an embodiment of the present invention is applied to each nozzle block in the electrospinning in the electrospinning apparatus comprising a plurality of nozzle blocks including a plurality of nozzles to produce a nanoweb Adjusting the direction of application of the voltage to control the integration direction of the fiber, and adjusting the intensity of the voltage applied to each nozzle block to adjust the fineness of the spinning fiber.

The invention can be applied to electrospinning devices for any spinning dope, such as solution spinning and melt electrospinning devices, as well as to electrospinning in both upward, side and top down electrospinning devices.

The electrospinning device comprises a plurality of nozzle blocks comprising one or more nozzles. 1 is a schematic diagram of an electrospinning apparatus to which a high voltage application method is applied in an electrospinning apparatus according to an embodiment of the present invention. The electrospinning device is typically located at a position opposite to the nozzle block, in which a spinning material supply unit for storing the spinning material, a metering pump for quantitative supply of the spinning material, one or more nozzle blocks having a plurality of nozzles for discharging the spinning material are arranged. And a collector for accumulating fibers and a high voltage generator for generating a high voltage between the nozzle block and the collector. For convenience of description, some components are not shown in FIG. 1.

As an example of the top-down electrospinning apparatus, a collector 30 is installed below the nozzle blocks 10 and 20 so that a high voltage is applied between the nozzle block and the collector. In the space between the nozzle block and the collector, a radiation zone in which electrospinning is formed is formed. The direction in which the fibers accumulate in the collector in the spinning zone is influenced by the direction (position) of the voltage applied to the nozzle block. Referring to FIG. 1, a voltage is applied to the first multi-nozzle radiating block 10 in the vertical direction VD1, and a voltage is applied to the second multi-nozzle radiating block 20 so as to be deflected to the right. When the voltage application position is changed in this way, the fibers radiated from the first multinozzle radiating block 10 are integrated in the collector in the vertical direction CD1, and the fibers radiated from the second multinozzle radiating block 20 are moved to the left side. It is integrated in the collector 30 in the bending direction CD2. Thus, the fiber integration direction can be adjusted by adjusting the voltage application direction or position.

2 is a schematic diagram of an electrospinning system to which a high voltage application method is applied in an electrospinning apparatus according to another embodiment of the present invention. The fineness of the spinning fiber varies depending on the strength of the voltage applied by the high voltage application device. As the intensity of the voltage increases, the fineness of the fiber to be radiated becomes thin. If the fineness is changed in this way, the thickness of the nanofiber web may vary.

In the present invention, the voltage application method may be applied in one place in a dot method, but may be added in a plate method. In this way, the shape of the electric field formation between the nozzle radiating block and the collector is changed, and for this reason, the accumulation of fibers is also changed.

In general, in the case of mass production of nanofibers, radiation nonuniformity may occur due to various causes, and thus, nonuniformity in thickness of the manufactured nanofiber web may occur. Particularly problematic in thickness nonuniformity is the width direction. In this specification, the advancing direction means the direction in which the nanofiber web is wound, and the width direction means the direction perpendicular to the advancing direction. The nonuniformity of the thickness in the width direction in the manufacturing process means that the thickness of the focused nanofiber web is relatively thin or thick due to the different strength of electric field formation depending on the position. According to the present invention, it is possible to prevent the nonuniformity of the thickness by adjusting the intensity of the voltage of the nozzle block.

Specifically, as shown in Figure 2, by varying the intensity of the voltage applied to each of the plurality of nozzle blocks, the fibers of the three fine islands and the fibers of the Taeseomdo can be simultaneously bonded to the fibers selectively. That is, in FIG. 2, a high voltage is applied to the first multi-nozzle radiating block 10 at a voltage intensity of V1, and a high voltage is applied to the second multinozzle radiating block 20 at a voltage intensity of V2 less than V1. When the voltage application intensity is changed in this way, the fibers of the fineness T1 thinning from the first multi-nozzle spinning block 10 are radiated and integrated in the collector 30, and from the second multi-nozzle spinning block 20, Microfine fibers of thick fineness T2 are integrated in the collector. According to the method of the present invention, it is possible to adjust the fineness of the fiber to be emitted by adjusting the intensity of the voltage applied to the nozzle block. Since the specific surface area of the web manufactured by electrospinning changes significantly with the diameter change of a fiber, it can apply suitably according to a use.

In the above, an embodiment of individually adjusting the voltage application direction (position) and the voltage intensity has been described, but by simultaneously adjusting the two, a web having more and more various functionalities can be manufactured. Due to the nonuniformity of the voltages formed between the spinning nozzles formed in the same nozzle block, the nanofiber webs focused on the collector may generate nonuniformity of physical properties.The thickness is uniformly adjusted by adjusting the voltage application direction (position) and voltage strength individually. Can produce a web.

On the other hand, in the present invention, by setting the voltage application direction of the nozzle block, and by changing the voltage application direction of the other nozzle block, it is also possible to manufacture a nanoweb with a uniform thickness of the nanoweb. That is, this problem can be solved when the thickness becomes nonuniform in a given spinning condition. On the contrary, a web having a difference in thickness may be intentionally manufactured to improve physical properties such as elongation.

3 is a schematic diagram of an electrospinning system to which a high voltage application method is applied in an electrospinning apparatus according to another embodiment of the present invention.

In the present invention, the lattice nanoweb may be manufactured by selectively setting the voltage application direction and the voltage application intensity for each nozzle block. For example, as shown in FIG. 3, a voltage is applied to the first multi-nozzle radiating block 10 in a direction VD3 deflected to the left, and a direction to which the second multi-nozzle radiating block 20 is deflected to the right ( Voltage is applied to V4). When the voltage application position is set in this way, the fibers radiated from the first multi-nozzle radiating block 10 are integrated in the collector in the direction CD3 bending to the right in FIG. 3, and are radiated from the second multi-nozzle radiating block 20. The fibers become integrated in the collector 30 in the direction of bending to the left (CD4). In this case, a web having a lattice pattern may be manufactured by being integrated in a direction crossing each other.

Polymeric materials usable in the present invention include polymer solutions, polymer melts, dissolved glass materials, and mixtures thereof. Non-limiting examples of representative polymer materials usable in the present invention include fluoropolymers, polyolefins, polyimides, polylactides, polyesters, polycaprolactones, polyvinylidene fluorides, polyacrylonitriles, polysulfones, polyimides, Polyethylene oxide, and these may be used alone or in a mixture of two or more. In the present invention, other additives may be added to the polymer solution or the molten polymer to improve physical properties.

In the present invention, the voltage applied to the nozzle block of the electrospinning apparatus is preferably applied to a voltage within the range of 10 ~ 100kV, the applied voltage charges the spinning material inside the nozzle, the charged spinning material is a spinneret As it passes, it is spun in the form of fine filaments.

The collector 30 may be applied with a polarity opposite to the polarity of the voltage applied to the nozzle block according to a process purpose, and may be in an earth state. The collector 30 forms a strong electric field with the polymer material in the form of fine filaments radiated through the spinneret of the nozzle so that the filaments are radiated and integrated into a nano-grade diameter. The collector may be a metal having excellent conductivity, and may be continuously supplied to the nozzle block by a transfer means such as a transfer roller. The collector may be in plate form or drum form. In order to continuously produce nanofibers, the collector is advantageously in the form of a rotatable drum.

On the other hand, the charged filament may be integrated on a non-metallic substrate such as woven fabric, nonwoven fabric, paper, etc. In this case, by placing and integrating the substrate on the front of the collector to form a web (web) is formed The substrate is calendered while passing through the R roller which is moved through the moving means and heated up and down, and finally is wound up by the winding roller.

The high voltage generator may use any method known in the art without limitation. Preferably, the voltage applied from the high voltage generator is in the range of 10 ~ 100kV is suitable for nanometer-class radiation.

Nanofibers that can be produced using the electrospinning of the present invention is a medical material such as moisture-permeable waterproof cloth, mask pack, wound dressing, filter material, photochemical sensor material, carbon material such as carbon nanotube, electronic device material, biomedical medicine It can be widely applied to materials for tissue, materials for tissue engineering, materials for drug delivery, basic materials for cosmetic preparation and cosmetic materials. For example, nanofibers have a very large surface area compared to their volume, so they have an excellent effect when applied to filters. When nanofibers made of electrically conductive nanofiber are coated on glass, the color of the window can be detected by detecting the amount of sunlight. Can change. When the conductive nanofiber is used as an electrolyte of a lithium ion battery, the size and weight of the conductive paper can be greatly reduced while preventing leakage of the electrolyte. In addition, if nanofibers are made from artificial proteins made similar to biological tissues, they can be used for the manufacture of bandages or artificial skins that are immediately absorbed into the body as the wound heals.

The present invention has been described above in detail using examples. However, the presented embodiments are exemplary and those skilled in the art may make various modifications and modifications to the embodiments without departing from the technical spirit of the present invention. The scope of the invention should not be limited by these modifications and variations, but should be defined only by the claims appended hereto.

1 is a schematic diagram of an electrospinning system to which a high voltage application method is applied in an electrospinning apparatus according to an embodiment of the present invention.

2 is a schematic diagram of an electrospinning system to which a high voltage application method is applied in an electrospinning apparatus according to another embodiment of the present invention.

3 is a schematic diagram of an electrospinning system to which a high voltage application method is applied in an electrospinning apparatus according to another embodiment of the present invention.

* Description of the symbols for the main parts of the drawings *

10: first multi-nozzle radial block 20: second multi-nozzle radial block

30: collector

T1, T2: yarn fiber fineness V1, V2: applied voltage intensity

VD1 to VD4: Voltage application direction CD1 to CD4: Fiber integration direction

Claims (6)

In manufacturing a nanoweb by electrospinning in an electrospinning apparatus comprising a plurality of nozzle blocks including a plurality of nozzles, Controlling the integration direction of the fiber by adjusting an application direction of a voltage applied to each nozzle block; And controlling at least one of the steps of adjusting the fineness of the spinning fiber by adjusting the intensity of the voltage applied to each nozzle block. The method according to claim 1, wherein the direct direction of the electrospun fibers is formed opposite to the direction of voltage application. The method of claim 1, wherein the method includes the step of selectively spinning the fibers of the three fine islands and the fibers of the fine islands by varying the intensity of the voltage applied to each of the plurality of nozzle blocks to selectively bond the fibers. Method of controlling radiation condition of electrospinning apparatus. The method of claim 1, wherein the method includes manufacturing a nanoweb having a thickness control according to a purpose by setting a voltage application direction of one nozzle block and changing a voltage application direction of another nozzle block. Radiation condition control method of an electrospinning apparatus. 2. The method of claim 1, wherein the method comprises the step of manufacturing the lattice nanoweb by selectively setting the voltage application direction and the voltage application intensity for each nozzle block. Way. The method of claim 1, wherein the electrospinning device is top-down.

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