KR20180085391A - Portable heating device - Google Patents

Abstract

The present invention relates to a portable heating device which is directly immersed in a liquid to be heated and is used in a form of a tea bag. According to an embodiment of the present invention, the portable heating device comprises: a heating unit which is directly immersed in a liquid to be heated and includes a heating layer formed by electrospinning a spinning material including at least one among nanomaterials and polymer materials; an electric wire which is electrically connected to one side of the heating unit and extends from the heating unit; and a power supply device which is connected to the electric wire and supplies power to the heating unit through the electric wire, wherein the heating layer is electrically connected at a point where a plurality of nano-heating fibers formed by electrospinning the spinning material cross each other to form a network.

Description

[0001] Portable heating device [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable heating device, and more particularly, to a portable heating device that is dipped directly in a liquid to be heated and configured to be used in the form of a tea bag.

In general, when performing specific tasks such as management of a building or specific facilities such as leisure activities or expenses such as mountain climbing, fishing, sports, or training in winter or low temperature in low atmospheric temperature, beverages such as coffee heated at an appropriate temperature Or hot water to cook instant foods such as ramen noodles is needed. In addition, even when the baby goes out together with the infant, it is necessary to heat the milk to an appropriate temperature or to heat the milk to an appropriate temperature in order to ride the milk powder according to the atmospheric temperature.

A heating means such as a portable burner is preferably used to obtain a beverage having a proper temperature or to heat the milk powder or the milk. However, when performing a leisure activity or a specific operation, carrying such a heating means separately incurs a considerable inconvenience . In addition, it is impossible to carry the actual heating means when the baby goes out together with the infant. In addition, depending on the place, it is prohibited to carry the heating means because of a safety accident such as a fire, and it is not easy to obtain hot water outdoors.

Therefore, when carrying out a leisure activity or a special work in the case of going out accompanied by an infant, it is general to store hot water heated to a suitable temperature for a so-called thermos bottle and carry it. However, the hot water stored in the thermos is not only susceptible to a change in temperature over time, but also has a problem of deterioration such as an unpleasant smell in thermos when the milk product such as milk is stored for a long time.

Therefore, there is a need for measures to obtain hot water for cooking, such as instant food, or for drinking, which can be easily heated while being easily portable.

Accordingly, various products adding a heat-generating function to a portable container have been introduced (see prior art document 1).

1 is a cross-sectional view schematically showing a conventional portable heating container P;

According to this portable heating container P, the heating body 2 is provided on the side surface or the side surface of the container 1, and the wall 1 of the container is heated to heat the material contained in the container have.

However, according to the conventional portable heating container P, since the material contained in the container is heated via the wall 1 of the container, not only the thermal efficiency is lowered but also the temperature of the container itself is increased, The durability is poor, and the user has a limitation that the user can experience inconvenience in using the container with the increased temperature.

1. Korean Patent Registration No. 10-1224224 (title of invention: thermally insulated container adopting a heating member)

SUMMARY OF THE INVENTION The present invention has been conceived to solve the problems as described above, and it is an object of the present invention to provide a heating device which is configured not to heat indirectly through a wall of a container, And the like.

Further, it is an object of the present invention to provide a portable heating device which is constructed so as to be flexible in its heat generating layer so as not to damage the heating layer even in external force such as folding or bending in outdoor activities.

The problems of the present invention are not limited to the above-mentioned problems, and other problems not mentioned can be clearly understood by those skilled in the art from the following description.

According to an aspect of the present invention, there is provided a portable heating device including: a heat generating layer formed by electrospinning a spinning material containing at least one of a nanomaterial and a polymer material; ; A wire electrically connected to one side of the heat-generating portion and extended from the heat-generating portion; A power supply connected to the electric wire and supplying electric power to the heat generator through the electric wire; The heat generating layer is electrically connected to a plurality of nano heat generating fibers formed by electrospinning the radiating material at a point where the nano heat generating fibers cross each other to form a network.

According to another aspect of the present invention, a waterproof layer may be formed to surround a part of the electric wire connected to the heat generating unit and the heat generating unit.

According to another aspect of the present invention, the power source device may be connected to an end of the electric wire opposite to the end connected to the heat generating portion.

According to another aspect of the present invention, the nanomaterial may be silver nanoparticles.

According to another aspect of the present invention, when a voltage of 2 V to 10 V is supplied to the heating layer, the density of the nano-exothermic fiber may be determined such that the heating portion generates heat in a temperature range of 50 ° C to 150 ° C.

According to another aspect of the present invention, the nano heat generating fiber may be formed to occupy 10% to 90% of the area of the heat generating portion.

According to still another aspect of the present invention, the heating layer can be co-electrospinning the radiation material.

According to the portable heating device of the present invention, it is possible to provide a heating device which can be heated by being dipped directly in the liquid to be heated, thereby improving the heat efficiency, instead of heating indirectly through the wall of the container or the like.

By forming the heat generating layer so as to include the nano heat generating fibers, the heat generating layer can be improved in durability by preventing the exothermic layer from being damaged by external force such as folding or warping in outdoor activities by improving the flexibility of the heat generating layer.

1 is a cross-sectional view schematically showing a conventional portable heating container.
2 is a perspective view schematically showing a portable heating device according to an embodiment of the present invention.
3 is a perspective view schematically showing an enlarged view of the area A in Fig.
Fig. 4 is a perspective view schematically showing an example of use of the portable heating device of Fig. 2;
5 is a perspective view schematically showing a heat generating layer and nano heat generating fibers included in a heat generating portion.
6 is a block diagram schematically showing an electrospinning device for producing nano-calorific fiber and a method for producing nano-calorific fiber using the device.
7 is a cross-sectional view schematically showing the shape of a nozzle that can be used in the electrospinning apparatus of FIG.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims.

It is to be understood that elements or layers are referred to as being "on " other elements or layers, including both intervening layers or other elements directly on or in between.

Although the first, second, etc. are used to describe various components, it goes without saying that these components are not limited by these terms. These terms are used only to distinguish one component from another. Therefore, it goes without saying that the first component mentioned below may be the second component within the technical scope of the present invention.

Like reference numerals refer to like elements throughout the specification.

The sizes and thicknesses of the individual components shown in the figures are shown for convenience of explanation and the present invention is not necessarily limited to the size and thickness of the components shown.

It is to be understood that each of the features of the various embodiments of the present invention may be combined or combined with each other partially or entirely and technically various interlocking and driving is possible as will be appreciated by those skilled in the art, It may be possible to cooperate with each other in association.

Hereinafter, a heat generating device including the nano-calorific fiber according to the present invention will be described in detail with reference to FIGS. 2 to 4. FIG.

1. Configuration of portable heating device

FIG. 2 is a perspective view schematically showing a portable heating device according to an embodiment of the present invention, FIG. 3 is a perspective view schematically showing an enlarged area A of FIG. 2, And is a perspective view schematically showing an example of use.

Referring to FIG. 2, the portable heating device 100 of the present invention includes a heating unit 110 that heats directly by being heated in a liquid to be heated, a wire 120 that is electrically connected to the heating unit and is elongated, And a power supply unit 130 for supplying power to the heat generating unit.

The heat generating portion 110 is arranged to be in contact with the liquid to be heated and emits heat to raise the temperature of the liquid to be heated.

Referring to FIG. 3, which is an enlarged view of part A of the heat generating part 110 of FIG. 2, the heat generating part 110 includes a heat generating layer 112 including nano heat generating fibers, And a waterproof layer 113 formed to cover the heat generating layer 112.

The substrate 111 forms the overall shape of the heat generating portion 110 and serves as a supporting layer on which the heat generating layer 112 is formed. When heat is generated in the heat generating layer 112, it is preferable that the substrate 111 is formed of a heat-resistant material whose shape and components are not deformed. In the present invention, the substrate (111) is not particularly limited.

The heat generating layer 112 is a layer in which the heat generating layer 112 generates heat by electrical resistance and is formed in close contact with at least one surface of the substrate 111.

The heating layer 112 is formed by electrospinning a spinning material containing at least one of a nanomaterial and a polymer material. Specifically, the heat generating layer 112 is configured to be electrically connected at a point where a plurality of nano heat generating fibers F formed by electrospinning a spinning material cross each other to form a network, and the nano heat generating fibers F are supplied with electric power It is configured to generate heat by electrical resistance.

As described below, since the nano-heat generating fiber F is formed of a flexible material, the heat generating layer 112 can be stably bound to the base material 111, and the heat generating portion 110 can be folded or bent The heat generating layer 112 may not be damaged. More specifically, the nano-exothermic fiber F and the heat-generating layer 112 will be described later with reference to Figs. 5 to 7.

The heating layer 112 may be formed so as to cover the entirety of one surface of the substrate 111, but may cover only a part of the substrate 111.

2, the heating unit 110 of the heating device 100 of the present invention is formed in the shape of a tea bag. However, the heating unit 110 of the heating device 100 of the present invention is not limited to the liquid to be heated And the shape of the heating device 100 is not necessarily limited to that shown in Fig. For example, the heat generating portion 110 may be formed in a simple plate shape or a three-dimensional columnar shape.

The waterproof layer 113 covers the heat generating layer 112 and completely seals the heat generating layer 112 so that the heat generating layer 112 does not contact the liquid to be heated. Although not shown, the waterproof layer 113 may include not only the heat generating layer 112 of the heat generating portion 110 but also a connecting portion where the heat generating portion 110 is connected to the electric wire 120 to be described later, As shown in FIG.

The waterproof layer 113 serves as a waterproof layer capable of preventing moisture permeation to the heat generating layer 112 and also serves as an insulating layer to prevent a current flowing in the heat generating layer 112 from leaking to the outside .

The waterproof layer 113 is preferably formed in close contact with the substrate 111 together with the heat generating layer 112.

For example, the waterproof layer 113 may be formed by applying a synthetic resin such as polypropylene or polytetrafluoroetylene, or may be formed by applying an inorganic material such as silica (SiO 2). The waterproof layer 113 may be formed by pressing another synthetic resin film or an inorganic film of a film type so as to cover the heat generating layer 112 by thermocompression using an automatic hot press.

However, it is to be understood that the waterproof layer 113 is not limited to the above-described ones, and any known material may be employed as long as it is a material that can effectively protect the heat generating layer 112.

2 and 4, the heating device 100 includes a power supply 120 connected to the heat generating unit 110 and extended from the power generating unit 110, and a power source 120 for supplying power to the heat generating unit 110 through the power supply 120. [ Device 130 as shown in FIG.

The electric wire 120 and the power supply unit 130 are electrically connected to one side of the heat generating unit 110 so that the heat generating unit 110 converts electric energy into thermal energy by supplying electric power to the heat generating unit 110, So that the heat can be generated.

In order for the heat generating layer 112 to receive power from the power source unit 130 and the electric wire 120, the heat generating device 100 of the present invention may include an electrode (not shown) electrically connected to the heat generating layer 112 .

The power supply unit 130 is preferably connected to an end opposite to the end connected to the heating unit 110 of the electric wire 120 and disposed outside the container that does not contact the liquid to be heated and receives the liquid.

Meanwhile, the connecting portion to which the heat generating unit 110 and the electric wire 120 are connected may be detachable.

The wire 120 is connected to the edge of one side of the heat generating portion 110 and is shown in the form of a thin line and this arrangement and form are merely illustrative and the electric wire 120 and the power supply 130 are not specifically described in the present invention And a known configuration may be employed.

Hereinafter, the structure of the nano-exothermic fiber forming the heat-generating layer included in the present invention and the method of producing the nano-exothermic fiber will be described in detail with reference to FIGS. 5 to 7.

2. Composition of nano-exothermic fiber contained in exothermic layer

5 is a perspective view schematically showing a heat generating layer 112 of the present invention and nano heat generating fibers F included therein.

Referring to FIG. 5, the heat generating layer 112 includes a plurality of nano heat generating fibers F.

The nano-exothermic fibers F are electrically connected to each other at a point N where they cross each other, so that a plurality of nano-calorific fibers F can form a network and current can flow.

The nano-exothermic fibers (F) may be formed to have a diameter ranging from about 50 nm to 1 mu m and a length ranging from several mu m to several hundred mu m.

Due to the characteristics of such a fine and flexible nano-calorific fiber F, the heat-generating layer formed by including the nano-calorific fiber F is not easily damaged by an external force such as folding or bending, and thus the electric safety can be ensured.

In this case, the density of the nano-exothermic fibers (F) to be formed is such that when the voltage of 2 V to 10 V is supplied to the heat generating layer 112, the heat generating layer 112 and the heat generating part 110 generate heat . ≪ / RTI > The nano heat generating fibers F may be formed to occupy 10% to 90% of the area of the heat generating portion 110 in order to configure the heat generating layer 112 to satisfy the performance condition.

3. Manufacturing method of nanofiber fiber

6 is a block diagram schematically showing an electrospinning device for producing nano-calorific fiber and a method for producing nano-calorific fiber using the device, and Fig. 7 is a cross-sectional view of a nozzle used for the electrospinning device of Fig. 6 Sectional view schematically showing the shape of the semiconductor device.

Electrospinning device

6, the electrospinning device includes a spinning solution tank 10, a spinning nozzle 20, an external power source 30, and a collector substrate 40.

The spinning solution tank 10 stores the spinning solution. The spinning solution tank 10 can pressurize the spinning solution using a built-in pump (not shown) to provide the spinning solution to the spinning nozzle 20.

The spinning nozzle 20 receives the spinning solution from the spinning solution tank 10 and emits the spinning solution. The spinning nozzle 20 emits the spinning solution by the voltage applied by the external power source 30 after the spinning solution is pressurized by the pump to fill the nozzle tube therein.

Here, as the spinning nozzle 20, a single nozzle 20a as shown in FIG. 7 (a) may be used, or a double nozzle 20b as shown in FIG. 7 (b) may be used.

Two types of spinning nozzles can be selectively used depending on the structure of the nano-exothermic fibers (F) included in the heat generating layer of the present invention. The manufacturing process of the nano-exothermic fiber (F) using the single nozzle (20a) or the double nozzle (20b) and the structure of the produced nano-calorific fiber (F) will be described later.

The external power supply 30 provides a voltage such that the spinning solution is radiated to the spinning nozzle 20. The voltage may vary depending on the type of spinning solution and the amount of spinning. For example from about 100 V to about 30000 V, and can be DC or alternating current. The voltage applied by the external power supply 30 can radiate the spinning solution filled in the spinning nozzle 20. [

The collector substrate 40 is located below the spinneret and accommodates the spinning solution to be emitted. Collector substrate 40 may be grounded to have a voltage of 0V, which is the ground voltage, or collector substrate 40 may have a voltage opposite to spinneret 20. Since the spinning nozzle 20 is charged to a positive voltage or a negative voltage by the external power source 30 and thus the spinning solution is also charged, a voltage difference occurs with the collector substrate 40 having a grounded or opposite voltage do.

When a voltage is applied to the spinning nozzle 20 by the external power source 30, the spinning solution at the end of the spinning nozzle 20 is formed into a conical shape like a Taylor cone. At this time, an electric field in the range of about 50000 V / m to about 150000 V / m may be formed between the spinning nozzle 20 and the spinning solution. Due to the voltage difference, the spinning solution can be radiated to the collector substrate 40 and received.

By controlling the flow rate of the spinning solution and the difference in voltage between the spinneret 20 and the collector substrate 40, the diameter and length of the nano-calorific fiber structure 50 accommodated in the collector substrate 40 Can be controlled. For example, the nanofibrillated fibrous structure 50 emitted from the electrospinning device described above may have a diameter in the range of about 50 nm to 1 mu m and a length in the range of about several mu m to several hundred mu m.

Meanwhile, the positional relationship between the spinneret 20 and the collector substrate 40 in FIG. 6 is exemplary, and the technical idea of the present invention is not limited thereto.

For example, the collector substrate 40 may be positioned above the spinneret 20 and spinning solution may be radiated upwardly from the spinneret 20, and the collector substrate 40 may be spin- And the spinning solution radiated from the spinning nozzle 20 may be radiated in the horizontal direction. The electrospinning method according to various arranging methods of the spinning nozzle 20 and the collector substrate 40 can be included in the technical idea of the present invention. The collector substrate 40 is not limited to the planar substrate. However, it is needless to say that a drum-type collector that rotates about the center axis of the collector substrate 40 may be used.

Further, the spinning nozzle 20 can spin the spinning solution in a linear form, for example, in a wire form or a rod form (i.e., a spinning mode). On the other hand, the spinning nozzle 20 can spin the spinning solution in the form of a spray (i.e., a spray mode). The spinning solution has a viscosity of the solution, a weight ratio of the solute in the solution, And the molecular weight of the solvent, and may be radiated in different forms depending on the magnitude of the applied voltage. For example, if the spinning solution has a relatively high viscosity or a relative The electrospinning process can be performed by the spinning mode and the electrospinning process is performed by the spray mode when the spinning solution has a relatively low viscosity or a relatively high voltage is applied .

The spinning mode and the spraying mode can be performed in combination in the production of the nano-calorific fiber (F), and will be described in more detail in the following description of a method of manufacturing a heating layer according to a single spinning coating process.

Electrospun material

The nano-exothermic fibers forming the heat-generating layer included in the present invention are made of nanomaterials and high-molecular materials.

The nanomaterial may comprise a conductive material, for example, including a metal nanomaterial or may comprise a carbon nanomaterial.

Specifically, the nanomaterial may be at least one selected from the group consisting of Ag, Cu, Co, Sc, Ti, Cr, Mn, (Cu), zinc (Zn), yttrium (Y), zirconium (Zr), niobium (Nb), molybdenum (Mo), technenium (Tc), ruthenium (Ru) , Cadmium (Cd), hafnium (Hf), tantalum (Ta), tungsten (W), rhenium (Re), osmium (Os), iridium (Ir), platinum , Lanthanide, actinoid, silicon, germanium, tin, arsenic, antimony, bismuth, gallium, And indium (In).

Nanomaterials can be composed of materials having a variety of nanoscopic shapes and include, for example, nanoparticles, nanowires, nanotubes, nanorods, nanowalls, (nanobelts), and nanorings (nanorings).

These nanomaterials can be composed of solutions of nanomaterials dissolved in a soluble solvent. The soluble solvent may be selected from the group consisting of water, alcohols and mixtures thereof, and examples thereof include water, methanol, ethanol, propanol, isopropanol, butanol, acetone, tetrahydrofuran, toluene or dimethylformamide, dimethylsulfoxide, N, N-dimethylformamide, 1-methyl-2-pyrrolidone, trimethylphosphate, and mixtures thereof.

However, the nanomaterial and the nanomaterial solution described above are illustrative, and the technical idea of the present invention is not limited thereto.

The polymer nanofibers formed from the polymer material and the polymer material may include various high molecular materials.

For example, the polymeric material may be selected from the group consisting of polyvinylpyrrolidone (PVP), polyvinyl alcohol (PVA), polymethyl methacrylate (PMMA), polydimethylsiloxane (PDMS), polyurethane, polyether urethane, cellulose acetate, cellulose (PA), polyacrylonitrile (PAN), polyperfuryl alcohol (PPFA), polystyrene, polyethylene oxide (PEO), poly (methyl methacrylate) And may include at least one selected from the group consisting of propylene oxide (PPO), polycarbonate (PC), polyvinyl chloride (PVC), polycaprolactone, polyvinyl fluoride and polyamide. The polymer material and the polymer nanofibers may include a copolymer of the above-mentioned materials, and examples thereof include polyurethane copolymers, polyacrylic copolymers, polyvinyl acetate copolymers, polystyrene copolymers, polyethylene oxide copolymers, poly Propylene oxide copolymers, and polyvinylidene fluoride copolymers. [0033] The term " copolymer "

Such a polymer substance may be composed of a solution of a polymer substance dissolved in a soluble solvent. The soluble solvent may be selected from the group consisting of water, alcohols and mixtures thereof, and examples thereof include water, methanol, ethanol, propanol, isopropanol, butanol, acetone, tetrahydrofuran, toluene or dimethylformamide, dimethylsulfoxide, N, N-dimethylformamide, 1-methyl-2-pyrrolidone, trimethylphosphate, and mixtures thereof.

However, the above-mentioned polymer material and polymer material solution are illustrative, and the technical idea of the present invention is not limited thereto.

Manufacturing process of nanofiber fibers by single spinning process

The specific process in which single emission is performed using the single nozzle 20a of Fig. 7 (a) is as follows.

First, a substrate for collecting the nano-calorific fiber structure 50 radiated from the single nozzle 20a is disposed. The substrate may be the collector substrate 40 of FIG. 6 or a separate substrate disposed on the collector substrate 40. In the case of a substrate separate from the collector substrate 40, the substrate may include the conductive material and have the same voltage state as the collector substrate.

The spinning solution supplied from the spinning solution tank 10 is electrospun onto the substrate.

The spinning solution used in the single spinning process may be the above-described nanomaterial solution or a mixed solution in which the solution of the polymer material is mixed with the nanomaterial solution described above. The spinning solution may be in a gel state.

The voltage applied during electrospinning may vary depending on, for example, the type of the nanomaterial, the type of the polymer material, the type of the substrate, the process environment, and the like, and may range, for example, from about 100 V to about 30,000 V.

The nano-calorific fiber structure 50 formed by electrospinning can be arranged to form a one-dimensional, two-dimensional or three-dimensional network structure that is formed on the substrate and overlapped and connected to each other. For example, the nano-calorific fiber structure 50 may form a one-dimensional network structure in which a plurality of linear-shaped structures are connected in parallel to each other and connected in a linear shape, and a plurality of linear- Dimensional network structure in which a plurality of linear structures are overlapped and connected to each other with a predetermined angle so as to form a three dimensional network A structure can be formed. Further, the nano-calorific fiber structure 50 may have a shape having a predetermined pattern, for example, a mesh shape, or may be arranged to have a web shape.

Next, an annealing process may be selectively performed to fix the deformation of the inside of the nano-calorific fiber structure 50 arranged on the substrate and to uniformly arrange the materials. The annealing can be performed by appropriately heating the nano-calorific fiber structure 50 in a predetermined temperature range by a heat treatment method of heating to a certain temperature and gradually cooling.

By increasing the bonding force between the nanomaterials included in the nano-calorific fiber structure 50 by the annealing process, the nano-calorific fiber structure 50 can be formed of the nano-calorific fiber F shown in Fig.

The annealing may be performed in an atmospheric air atmosphere, an inert atmosphere containing argon gas or nitrogen gas, or a reducing atmosphere containing hydrogen gas. The annealing process may be omitted as an option or may be performed stepwise several times.

Fabrication of nano-exothermic fiber by single spinning coating process

A specific process in which a single spin coating is performed using the single nozzle 20a of Fig. 7 (a) is as follows.

First, a substrate for collecting the nano-calorific fiber structure 50 radiated from the single nozzle 20a is disposed. The step of disposing the substrate is the same as that described above in the ' method of manufacturing a nano-exothermic fiber according to the single spinning process "

The spinning solution supplied from the spinning solution tank 10 is electrospun onto the substrate.

The spinning solution used in the single spinning coating process may be a solution of a selected one of the nanomaterial solution and the polymer solution described above. The spinning solution may be in a gel gel state.

As described above in the 'method of manufacturing a nano-exothermic fiber according to a single spinning process,' the voltage applied during electrospinning can be changed according to the type of the nanomaterial, the type of the polymer material, the type of the substrate, Such as from about 100 V to about 30,000 V, for example.

Next, a coating layer is formed on the radiated nanofibers so as to surround at least a part of the radiated nanofibers by spray-spinning the nanofibers solution and another solution in the solution of the polymer solution and the electrospun solution.

As described above, since the spinning mode or the spray mode can be performed according to the magnitude of the voltage to be applied, depending on the viscosity of the spinning solution, the physical properties such as the solute and the kind of solution using the electrospinning device, By forming the coating layer in spray mode on the spun nanofibers, a dual nano-calorific fiber structure 50 configured to form different layers of nanomaterials and polymeric materials can be produced.

For example, the polymer fiber including the polymer material may be located on the inner side and the coating layer including the nanomaterial may be located on the outer side of the polymer fiber. Alternatively, the nanofiber including the nanomaterial may be located on the inner side A coating layer containing a polymer material may be formed in a double structure in which the coating layer is surrounded and surrounded by the nanofibers. Here, the coating layer may be formed to completely surround the radiated nanofibers, or may be formed so as to surround a part of the nanofibers emitted so that a part of the radiated nanofibers is exposed to the outside.

The nano-calorific fiber structure 50 formed by the single spin coating may be arranged to form a one-dimensional, two-dimensional or three-dimensional network structure formed by overlapping and connecting to each other on the substrate, The nano-calorific fiber structure 50 may be formed of nano-calorific fibers F having a length in the range of about several micrometers to several hundreds of micrometers.

On the other hand, a sintering process may be performed to selectively remove the polymer material in the nano-calorific fiber structure 50 of the double layer. When the polymer material is removed by the sintering process, rod-type or hollow-type nano-calorific fibers can be produced.

That is, when the nano-calorific fiber structure 50 is formed to have a double-layer structure such that the polymer material surrounds the nanomaterial, when the polymer material is sintered and removed, finally the nano-calorific fibers F are formed do. On the other hand, when the nano-calorific fiber structure 50 is formed in a bilayer structure such that the nanomaterial is surrounded by the polymer material, when the polymer material is removed under sintering, the nano-calorific fiber F is finally formed in a rod shape.

The sintering method for removing the polymer material may be chemical sintering, light sintering and heat sintering.

The chemical sintering means sintering in such a manner that the polymer material is melted by impregnating a nano-exothermic fiber structure (50) in which a polymer material and a nanomaterial form a double layer in an organic solvent capable of melting a polymer material.

Here, the organic solvent may include all kinds of solvents capable of dissolving the polymer material. The organic solvent may be an alkane such as hexane, an aromatic such as toluene, an ether such as diethyl ether, an alkyl halide such as chloroform, an ester, an aldehyde, a ketone, an amine, an alcohol, an amide, And water. The organic solvent is, for example, acetone, fluoroalkane, pentane, hexane, 2,2,4-tricetylpentane, decane, cyclohexane, cyclopentane, diisobutylene, 1-pentene, carbon disulfide, carbon tetrachloride Chlorobutane, diisopropyl ether, 1-chloropropane, 2-chloropropane, toluene, trichlorobenzene, benzene, bromoethane, diethyl ether, diethyl sulfide, chloroform, But are not limited to, dichloromethane, 4-methyl-2-propanone, tetrahydrofuran, 1,2-dichloroethane, , At least one selected from the group consisting of dimethylsulfoxide, aniline, diethylamine, nitromethane, acetonitrile, pyridine, 2-butoxyethanol, 1-propanol, 2-propanol, ethanol, methanol, ethylene glycol and acetic acid One can be included.

The light sintering is performed by irradiating the light of a desired wavelength range (or the entire area) with a constant energy for 1 second to several seconds by using a xenon lamp or the like, thereby removing the polymer material for a short time using light and forming a network of nanomaterials .

In the photo-sintering process, light pulse, on-time, turn-off time, voltage and wavelength range are important control variables.

The light sintering may be performed within a few seconds, and thus may be repeatedly performed as needed.

The heat sintering means sintering in such a way that the polymer material is melted by heating the nano-exothermic fiber to a temperature range above the melting point of the polymer material.

For example, it is possible to heat-sinter at a high temperature of 500 ° C or higher to melt the polymer material and allow the nanomaterials to form networking with each other. However, when a general glass substrate or a plastic substrate having a low melting point is used, a process of heat sintering at a high temperature can not be used. Therefore, it is necessary to pay attention to the selection of the substrate when employing the heat sintering method.

Fabrication of nano-exothermic fibers by dual spinning process

The specific process in which the double spinning is performed using the double nozzle 20b of FIG. 7 (b) is as follows.

The dual nozzle 20b may include a first nozzle 21 for emitting a first radiation material and a second nozzle 22 for emitting a second radiation material. The first nozzle 21 is connected to a first tank 11 containing a first radiation material and the second nozzle 22 is connected to a second tank 12 containing a second radiation material. The double nozzles 20b allow the first and second radiation materials to be radiated simultaneously without mixing.

The double nozzle 20b includes a first nozzle 21 and a second nozzle 22 formed so as to surround the first nozzle 21 so that the distance between the first nozzle 21 and the second nozzle 22 Axis are coaxial double structure nozzles configured to coincide with each other. The double nozzle 20b of the present invention is not limited to the coaxial double nozzle but may be a double nozzle 20b in which the first nozzle 21 and the second nozzle 22 are arranged in parallel, It is needless to say that the nozzle can be changed into a double nozzle of the type.

First, a substrate for collecting the nano-calorific fiber structure 50 radiated from the double nozzle 20b is disposed. The step of disposing the substrate is the same as that described above in the ' method of manufacturing a nano-exothermic fiber according to the single spinning process "

The first and second spinning solutions supplied from the first tank 11 and the second tank 12 are doubly electrospun on the substrate.

The first spinning solution can be simultaneously spinning the second spinning solution and have the same spinning length. Also, the second spinning solution may be radiated by surrounding the outer side of the first spinning solution, and the first spinning solution may be located inside the second spinning solution. Accordingly, the nano-calorific fiber structure 50 accommodated in the substrate may have a bilayer structure in which the first spinning solution is located inside and the second spinning solution surrounds the outer side of the first spinning solution.

Here, the first spinning solution may be a nanomaterial solution, the second spinning solution may be a polymer material solution, or the second spinning solution may be a polymer material solution and the second spinning solution may be a nanomaterial solution. As described above, the types of the first spinning solution and the second spinning solution may be selected depending on whether the nano-exothermic fiber to be manufactured according to the electrospinning process of the present invention is a rod type or a hollow type. .

In order to easily form the coaxial double layer nano-calorific fiber structure 50, it is preferable that the first spinning solution and the second spinning solution should not be mixed with each other, so that spinning is performed under the following conditions.

The injection and spinning speed of the second spinning solution on the outside may be equal to or larger than the injection and spinning speed of the first spinning solution on the inside. At least one of the first spinning solution and the second spinning solution needs to have conductivity, and the vapor pressures of the first spinning solution and the second spinning solution should be the same or similar. In addition, the viscosity of the first spinning solution must be equal to or greater than the viscosity of the second spinning solution.

For example, in the double spinning process of the present invention, the injection and spinning rate of the first spinning solution is in the range of 0.1 ml / hour to 1.5 ml / hour, the injection and spinning rate of the second spinning solution is in the range of 1.5 ml / hour to 3.5 ml / hour Lt; / RTI > However, such an injection rate is an exemplary one, and the technical idea of the present invention is not limited thereto.

According to the above-described 'method for producing a nano-exothermic fiber according to the double spinning process, the nano-calorific fiber structure 50 is formed in a double layer structure so that the polymer material surrounds the nanomaterial or the nanomaterial surrounds the polymer material. The nano-heat-generating fiber structure 50 may be arranged so as to form a one-dimensional, two-dimensional or three-dimensional network structure formed by being overlapped and connected to each other on the substrate. By the annealing process, (50) may be formed of nano-exothermic fibers (F) having a length in the range of about several micrometers to several hundreds of micrometers.

The thus formed double-layered nano-calorific fiber structure 50 may be formed of a rod-type or hollow-type nano-calorific fiber F by selectively sintering the polymer material. The sintering process is the same as the sintering process according to the 'method for manufacturing nano-exothermic fiber according to the single spinning coating process' described above, so a duplicated description will be omitted.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, You will understand. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

100 ... Heating device
110 ... The heating unit
111 ... materials
112 ... Heating layer
113 ... Waterproof layer
F ... Nano-thermal fibers
120 ... wire
130 ... Power supply
10 ... Spinning solution tank
11 ... The first tank
12 ... The second tank
20 ... Spinning nozzle
20a ... Single nozzle
20b ... Double nozzle
21 ... The first nozzle
22 ... The second nozzle
30 ... External Power
40 ... Collector substrate
50 ... Nano-heating fiber structure

Claims (7)

A heating unit directly immersed in the liquid to be heated and including a heating layer formed by electrospinning a spinning material containing at least one of a nanomaterial and a polymer material;
A wire electrically connected to one side of the heat-generating portion and extended from the heat-generating portion;
A power supply connected to the electric wire and supplying electric power to the heat generator through the electric wire; Lt; / RTI >
Wherein the heating layer is configured to be electrically connected to a network at a point where a plurality of nano heat generating fibers formed by electrospinning the radiating material are intersected with each other. The method according to claim 1,
And a waterproof layer is formed to surround a part of the electric wire connected to the heat generating part and the heat generating part. The method according to claim 1,
Wherein the power source unit is connected to an end of the electric wire opposite to the end connected to the heat generating unit. The method according to claim 1,
Characterized in that the nanomaterial is silver nanoparticles. The method according to claim 1,
Wherein the density of the nano-exothermic fibers is determined so that the exothermic portion generates heat in a temperature range of 50 ° C to 150 ° C when a voltage of 2V to 10V is supplied to the exothermic layer. The method according to claim 1,
Wherein the nano heat generating fiber is formed to occupy 10% to 90% of the total area of the heat generating portion. The method according to claim 1,
Wherein the heat generating layer is formed by co-electrospinning the radiation material.

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