KR20180069189A

KR20180069189A - Heater Sheet

Info

Publication number: KR20180069189A
Application number: KR1020160170588A
Authority: KR
Inventors: 정해용
Original assignee: 희성전자 주식회사
Priority date: 2016-12-14
Filing date: 2016-12-14
Publication date: 2018-06-25

Abstract

The present invention relates to a heat generating sheet having a heat generating layer on one side of a sheet, capable of uniform heat generation in an overall area, and capable of producing a cold product by itself without a separate heat generating pad.
A heat generating sheet according to an embodiment of the present invention includes a heat generating layer formed by electrospinning a radiating material including at least one of a nano material and a polymer material on one surface of a sheet, And a plurality of nano-calorific fibers formed by electrospinning the material are electrically connected at a point where they cross each other to form a network.
According to the heat-generating sheet of the present invention, it is possible to provide a heat-generating sheet capable of performing a uniform heat-generating function in the overall area and a product for winter keeping made of the heat-generating sheet. Further, even if a separate member such as a heating pad is not provided, it is possible to provide a lightweight heating sheet warming product by constituting the sheet itself to have a heat generating function. In addition, It is possible to provide a heat generating sheet which is improved in flexibility and can be prevented from being broken.

Description

Heating Sheet {Heater Sheet}

The present invention relates to a heat generating sheet, and more particularly, to a heat generating sheet having a heat generating layer on one side of a sheet, capable of uniform heat generation in an overall area, and capable of producing a cold weather product without having a separate heat generating pad And more particularly to a heat-generating sheet which can be used as a heat-

Recently, there is a tendency to improve the added value by adding functionalities to textile products. For example, a textile product having a heat-generating function added to a cushion, a quilt, a sleeping bag, clothes, or the like, which has been conventionally used for keeping warmth, has been proposed.

For example, in the past, in the past, generally, thick and expensive materials were used to preserve body temperature and prevent cold air from outside. This type of warm-up fiber product is manufactured by a method of embedding a warming member inside, and superimposing chemically treated woven fabric so that cold air does not permeate the lining and the outer surface. However, the fiber product thus manufactured is heavy and bulky, and since there is no separate heating layer, there is a limitation in that it can not exhibit a thermal effect when it is left at a low temperature for a long time.

In order to compensate for these drawbacks, there has been proposed a clothing for winter use in which a heat-generating pad is inserted into a garment and a connector connected to the heat-generating pad is connected to a battery to generate heat for the heat-generating pad.

[0003] In winter clothes with built-in heat-generating pads, heat-generating pads are usually mounted on the inner side of the lining, and then the heat-resistant pads are stitched and finished. In this type of winter clothes, since heat is directly transferred in a local region of a specific region, there is a problem that the user may be burnt in some cases.

In addition, when washing is required, water tends to penetrate into the portion where the heat generating pad is mounted, which results in poor durability and breakage of the heat generating pad.

On the other hand, most heat-generating pads in the related art are configured in such a manner that metal thin plates such as nichrome, copper alloy, and aluminum, which are conductive materials, are arranged in a predetermined pattern, or metal coils are arranged at regular intervals. However, this type of heat generating pad has structural limitations in that the flexibility of the heat generating pad itself is extremely low due to the morphological characteristics of the thin metal plate or the coil and the hardening of the adhesive used for fixing them.

1. Korean Patent Registration No. 10-1564950 (Title of the Invention: Method of Manufacturing Fiber Product Having Heat Pad)

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a cushion, a quilt, a sleeping bag and a clothes for winter using a heating sheet with a heat generating function, So that uniform heat can be generated in the entire area of the cold weather product.

Furthermore, the present invention provides a heat-generating sheet which is improved in flexibility and can prevent disconnection by providing a lightweight cold-weather product by being constructed to be able to perform a heat-generating function in a textile product itself, and to escape from a conventional form including a heating plate or a heat- There is a purpose.

Another object of the present invention is to provide a heat generating sheet having an anti-bacterial and deodorizing effect by using silver (Ag) nanomaterials for easy washing by constituting a waterproof function.

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 heating sheet comprising a heating layer formed by electrospinning a spinning material including at least one of a nanomaterial and a polymer material on one surface of a sheet, The heating layer is configured to be electrically connected at a point where a plurality of nano-calorific fibers formed by electrospinning the radiating material intersect with each other to form a network.

According to another aspect of the present invention, an insulating layer may be formed to surround the heating layer.

According to another aspect of the present invention, the heat generating layer may further include a protective layer formed to surround the heat generating layer and the sheet.

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

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

According to the heat-generating sheet of the present invention, it is possible to provide a heat-generating sheet capable of performing a uniform heat-generating function in the overall area and a product for winter keeping made of the heat-generating sheet. Further, even if a separate member such as a heating pad is not provided, it is possible to provide a lightweight heating sheet warming product by constituting the sheet itself to have a heat generating function. In addition, It is possible to provide a heat generating sheet which is improved in flexibility and can be prevented from being broken.

Furthermore, by providing a heat-generating sheet with a water-proofing function, a cold-weather product can be constructed to facilitate washing. When silver nanomaterials are used for the heat-generating layer, the heat- Effect can be provided.

1 is a perspective view schematically showing a heat generating sheet according to an embodiment of the present invention.
FIG. 2 is a perspective view schematically showing an insulating layer formed so as to cover a heat generating layer of the heat generating sheet of FIG. 1;
FIG. 3 is a perspective view schematically showing a protective layer formed on the heat generating sheet of FIG. 1; FIG.
4 is a perspective view schematically showing a heat generating layer of the present invention and nano-exothermic fibers included therein.
5 is a block diagram schematically showing an electrospinning device for producing nano-calorific fibers and a method for producing nano-calorific fibers using the device.
Fig. 6 is a cross-sectional view schematically showing the shape of a nozzle that can be used in the electrospinning apparatus of Fig. 5;

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, the heat generating sheet according to the present invention will be described in detail with reference to FIGS. 1 to 3 attached hereto.

1. Composition of heating sheet

FIG. 1 is a perspective view schematically showing a heat generating sheet according to an embodiment of the present invention, FIG. 2 is a perspective view schematically showing an insulating layer formed to cover a heat generating layer of the heat generating sheet of FIG. 1, Is a perspective view schematically showing a state in which a moisture-proof and waterproof layer is formed on the heat generating sheet of Fig.

Referring to FIG. 1, a heating sheet 100 of the present invention includes a base sheet 110 (hereinafter referred to as a 'sheet') and a heating layer 120 formed on one side of the sheet 110.

The sheet 110 is made of glass fiber, synthetic fiber, natural fiber, synthetic leather, natural fiber, or the like having heat resistance to stably withstand the heat generated from the heat generating layer 120 and insulation that electrically insulates the heat generating layer 120 from the outside. Leather, synthetic resin, or a combination thereof.

For example, in the case where the heating sheet 100 of the present invention is used to produce cold clothes, blanket, etc., the sheet 110 may be a cotton, polyester, or rayon material. However, it is needless to say that the sheet 110 is not limited to the above-mentioned material, and a known sheet material used for forming the heat generating sheet may be used.

The heat generating layer 120 is a layer that generates heat by electrical resistance and is formed on one surface of the sheet 110 including a plurality of nano heat generating fibers 121.

The nano-calorific fibers 121 and the heat generating layer 120 including the nano-calorific fibers 121 can be stably bound to one surface of the sheet 110. [ Therefore, the heat generating sheet 100 of the present invention includes the nano heat generating fibers 121 and the heat generating layer 120 including the nano heat generating fibers 121, thereby having improved flexibility and electrical stability as compared with the case of using the conventional heat generating plate or heat generating coil as a heat generating layer. .

The nano-calorific fiber 121 is formed by electrospinning a spinning material containing at least one of a nanomaterial and a polymer material. Specific details of the nano-heat generating fiber 121 and the heat generating layer 120 will be described later with reference to Figs. 4 to 6. Fig.

The heating layer 120 is electrically connected to a power source (not shown). For example, by connecting the core wire of the one-side coated wire to the one end of the heating layer and the power source unit, power can be supplied from the power source unit to the nano-calorific fiber 121 of the heating layer 120. The electric wire that supplies electric power from the power source unit and the power source unit to the heating layer 120 is not specifically limited in the present invention, and a known configuration may be employed.

Referring to FIG. 2, an insulating layer 130 is formed to surround the heating layer 120.

The insulating layer 130 functions to prevent a current flowing in the heat generating layer 120 from leaking to the outside.

The insulating layer 130 may be formed by applying an insulating synthetic resin such as polypropylene. In addition, an insulating synthetic resin film may be adhered or formed, and a fiber product such as a nonwoven fabric may be adhered thereto.

However, the insulating layer 130 is not limited to the above-described ones. The insulating layer 130 may be formed in a known manner using a known insulating material as long as it can effectively insulate the current flowing through the heat generating layer 120 to be. 2, the insulating layer 130 is formed to cover the heating layer 120. However, the insulating layer 130 is also illustrative and not limited thereto.

Referring to FIG. 3, a protective layer 140 is formed to cover the entirety of the heating layer 120 and the sheet 110.

The protective layer 140 serves to function as a heat insulating layer to prevent heat generated in the heat generating layer from being lost to the outside and to function as a waterproof layer to prevent moisture permeation to the heat generating layer.

The protective layer 140 is formed to cover the entirety of the heat generating layer 120 and the sheet 110 so that the heat generated in the heat generating layer 120 is prevented from being lost to the outside, 110) can be effectively prevented. More preferably, the protective layer 140 is formed to be in close contact with the heating layer 120 and the entire sheet 110.

The protective layer 140 may be formed of a Teflon resin that is resistant to external impact such as friction, as well as being nonflammable, water-resistant, and heat-resistant. The protective layer 140 may be formed by applying liquid Teflon resin so as to cover the heat generating layer 120 and the sheet 110. The protective layer 140 may be formed by heating the Teflon resin of the film type by heat pressing using a high- 120 and the sheet 110, as shown in FIG.

3, the protective layer 140 is formed so as to cover the entirety of the heating layer 120 and the sheet 110. However, the present invention is not limited thereto, and the heating layer 120 and a part of the sheet 110 may be Of course, be covered. For example, the protective layer 140 may be configured to cover only the heating layer 120 if the sheet 110 is configured to perform its own thermal insulation and waterproof functions.

Hereinafter, the structure of the nano-exothermic fiber forming the heat-generating layer and the method of producing the nano-exothermic fiber according to the present invention will be described in detail with reference to FIGS. 4 to 6.

2. On the exothermic layer Composition of nano-exothermic fibers included

4 is a perspective view schematically showing a heat generating layer 120 of the present invention and nano heat generating fibers 121 (hereinafter referred to as 'F') included therein.

Referring to FIG. 4, the heating layer includes a plurality of nano-calorific fibers (F).

The nano-exothermic fibers 121 are electrically connected to each other at points N intersecting with 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 nature of such a fine and flexible nano-calorific fiber F, the heat-generating layer formed by including the nano-calorific fiber 121 can be easily damaged by an external force such as folding or bending, thus securing electrical safety.

3. Manufacturing method of nanofiber fiber

FIG. 5 is a block diagram schematically showing an electrospinning device for producing nano-heat-generating fibers and a method for producing nano-calorific fibers using the device, and FIG. 6 is a cross- Sectional view schematically showing the shape of the semiconductor device.

Electrospinning device

5, the electrospinning device 1 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.

A single nozzle 20a as shown in FIG. 5 (a) may be used as the spinning nozzle 20, or a double nozzle 20b as shown in FIG. 5 (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 nano-calorific fiber structure 50 emitted from the electrospinning device 1 described above may have a diameter in the range of about 50 nm to 1 μm and a length in the range of about several μm to several hundred μm.

Meanwhile, the positional relationship between the spinneret 20 and the collector substrate 40 in FIG. 5 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, (nanobelt), and nanorring (nanoring).

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 by which single emission is performed using the single nozzle 20a of Fig. 6 (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. 5 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 in which the material is heated to a predetermined temperature and slowly cooled.

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. 6 (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 in the above-described " method for manufacturing a nano-exothermic fiber according to a single spinning process "

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-emissive fibrous structure 50 formed by the single spinning 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. By the annealing process described above, The exothermic fiber structure 50 may be formed of a nano-exothermic fiber 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. 6 (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 in the above-described " method for manufacturing a nano-exothermic fiber according to a 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, 100 ', 100''... Heating sheet
110 ... Base sheet
120 ... Heating layer
121 ... Nano-thermal fibers
130 ... Insulating layer
140 ... Protective layer
One … Electrospinning device
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

And a heating layer formed by electrospinning a spinning material including at least one of a nanomaterial and a polymer material on one surface of the sheet,
Wherein the heating layer is electrically connected to a network at a point where a plurality of nano heat generating fibers formed by electrospinning the radiating material intersect with each other to form a network.

The method according to claim 1,
The heat generating sheet according to claim 1, further comprising an insulating layer formed to surround the heat generating layer.

The method according to claim 1,
And a protective layer formed to surround the heating layer and the sheet.

The method according to claim 1,
Characterized in that the nanomaterial is silver nanoparticles.

The method according to claim 1,
Wherein the heat generating layer is formed by co-electrospinning the radiating material.