Sheet heating element and clothing management device, hot and cold water purifier, and floor heating panel for buildings that include the same

Abstract

The sheet heating element according to the present invention is configured such that a pair of electric wires are inserted into a matrix formed by molding a base resin and a conductive material, and heat is generated by electrical resistance generated inside the matrix when power is applied, so that the sheet heating element has a simple structure and is easy to manufacture, while still providing sufficient heating effect regardless of thermal conductivity. In addition, the sheet heating element is divided into a heating portion and a non-heating portion, and the heating portion and the non-heating portion are integrally manufactured by a double injection molding method, so that sheet heating elements of various shapes can be manufactured, while the manufacturing process is simple, thereby reducing manufacturing costs and time.

Description

[Technical field]

[0001] The present invention relates to a sheet-shaped heating element and a hot and cold water purifier, a floor heating panel for a building, and a clothing management machine using the same, and more specifically, to a sheet-shaped heating element that is manufactured by inserting a pair of electric wires into a conductive composite material containing a base resin and a conductive resin, and that is capable of generating heat when power is applied while having a simple manufacturing process, and a clothing management machine, a hot and cold water purifier, and a floor heating panel for a building that include the same. [Background technology]

[0002] A typical example of a commonly used electric heater is a sheath heater, which is a tubular heater in which a coil of electric heating wire is placed inside a metal protective tube and then filled with magnesium oxide, an insulating powder, to insulate the heating wire from the protective tube. Such sheath heaters are robust against external physical impacts, have high efficiency of electric heat energy, and can be processed into various shapes to suit the user's needs and configuration.

[0003] Recently, as electric heaters are used in a variety of products, interest in sheet heating elements that are more compact and easy to manufacture is increasing.

[0004] Conventional sheet heating elements are manufactured by laminating a plurality of sheets or coating a sheet with a heating layer, which results in a complicated manufacturing process and a long manufacturing time. Summary of the Invention [Problem to be solved by the invention]

[0005] An object of the present invention is to provide a sheet heating element which can be manufactured in various shapes while being manufactured through a simple process, and a clothing care machine, a hot and cold water purifier, and a floor heating panel for a building including the sheet heating element. [Means for solving the problem]

[0006] The sheet heating element according to the present invention includes a heating section in which a pair of electric wires are inserted at a predetermined distance from each other into a matrix formed by molding a conductive composite material obtained by mixing a base resin and a conductive material, and heat is generated by electric resistance generated from inside the matrix when a power source is applied so that the electric wires have a potential difference. The conductive material is dispersed in the base resin, and is interposed between a carbon member forming an electrical network and the carbon member, thereby increasing the electrical network by the carbon member and increasing the thermal conductivity of the conductive composite material, thereby generating electrical resistance heat generated by the carbon member. and a metal powder which is transferred to the surface of the heating part, wherein the conductive composite material has a base resin content of 60 to 72 wt%, a carbon member content of 10 wt% or more and 17 wt% or less to form the electrical network, a diameter of the metal powder of 10 to 100 nm, a metal powder content of 12 wt% or more and 22 wt% or less to increase the electrical network between the carbon members and increase the thermal conductivity of the conductive composite material, and a specific gravity of the conductive composite material (test result according to ASTM D792) of 0.8 to 1.3, and a specific resistance of 2 to 10 Ωmm. 2 / m, and the thermal conductivity is 156~235kcal / mh℃.

[0007] The tensile strength of the conductive composite material (test results according to ASTM D638) is 180 to 200 kgf / cm 2 It is.

[0008] The carbon member includes carbon nanotubes and graphene, and the mixture ratio of the graphene to the carbon nanotubes is 1w%:10w%.

[0009] The carbon member includes at least one of a carbon fiber and a carbon nanotube, and the length of the carbon member is 1 to 100 μm.

[0010] The metal powder includes aluminum powder.

[0011] The base resin includes a non-conductive resin, such as ABS (acrylonitrile-butadiene-styrene), silicone, PE (Polyethylene), PET (Polyethylene terephthalate), PP (Polypropylene), or PDMS (Polydimethylsiloxane), and a conductive resin, such as PPy (Polypyrrole), and the content of the conductive resin in the base resin is greater than 0 and less than or equal to 10 wt %.

[0012] The conductive composite material further includes a stabilizer and an adhesive, the content of the stabilizer being 0.1 to 0.6 w %, and the content of the adhesive being 0.4 to 2.1 w %.

[0013] The wire comprises at least one of an aluminum wire, a copper alloy wire, a copper wire, and a conductive composite wire.

[0014] The heating unit further includes a non-heating unit that is partitioned and integrally formed with the heating unit and is made of a material having lower electrical conductivity than the conductive composite material.

[0015] The wire is insert injection molded into the matrix, and the heating section and the non-heating section are double injection molded.

[0016] The clothes care machine using the sheet heating element according to the present invention includes an ironing board for pressing clothes to remove wrinkles or to form tucks in trousers, the ironing board being a sheet heating element including a heating part in which a pair of electric wires are inserted at a predetermined distance from each other into a matrix formed by molding a conductive composite material obtained by mixing a base resin and a conductive material, and the pair of electric wires are inserted at a predetermined distance from each other into the matrix ... and a metal powder for increasing the thermal conductivity of the conductive composite material and transferring the electric resistance heat generated by the carbon member to the surface of the heating part, wherein the content of the base resin in the conductive composite material is 60 to 72 wt%, the content of the carbon member in the conductive composite material is 10 wt% or more but 17 wt% or less in order to form the electric network, the diameter of the metal powder in the conductive composite material is 10 to 100 nm, the content of the metal powder is 12 wt% or more in order to increase the electric network between the carbon members and increase the thermal conductivity of the conductive composite material and 22 wt% or less in order to reduce the specific gravity of the conductive composite material, and the specific gravity of the conductive composite material (test result according to ASTM D792) is 0.8 to 1.3, and the specific resistance is 2 to 10 Ωmm. 2 / m and the thermal conductivity is 156 to 235 kcal / mh℃.

[0017] The hot and cold water purifier using the sheet heating element according to the present invention includes a sheet heating element provided to contact at least one surface of a hot water tank containing hot water, the sheet heating element including a pair of electric wires inserted at a predetermined distance from each other into a matrix formed by molding a conductive composite material obtained by mixing a base resin and a conductive material, and a heating part that generates heat by electric resistance generated from inside the matrix when a power source is applied so that the electric wires have a potential difference, and the conductive material is dispersed in the base resin and is interposed between a carbon member forming an electrical network and the carbon member, thereby increasing the electrical network by the carbon member and the conductive composite material. and a metal powder for increasing thermal conductivity and transferring electrical resistance heat generated by the carbon member to a surface of the heating part, wherein the conductive composite material has a base resin content of 60 to 72 wt%, a carbon member content of 10 wt% or more and 17 wt% or less to form the electrical network, a diameter of the metal powder of 10 to 100 nm, a metal powder content of 12 wt% or more and 22 wt% or less to increase the electrical network between the carbon members and increase the thermal conductivity of the conductive composite material, and a specific gravity of the conductive composite material (test result according to ASTM D792) of 0.8 to 1.3, and a specific resistance of 2 to 10 Ωmm. 2 / m and the thermal conductivity is 156 to 235 kcal / mh℃.

[0018] The floor heating panel of a building using a sheet heating element according to the present invention includes a sheet heating element provided in the floor heating panel of the building, the sheet heating element including a pair of electric wires inserted at a predetermined distance from each other into a matrix formed by press-molding a conductive composite material obtained by mixing a base resin and a conductive material, and a heating part which generates heat by electric resistance generated from inside the matrix when a power source is applied so that the electric wires have a potential difference, the conductive material being dispersed in the base resin and interposed between the carbon members forming an electrical network, thereby increasing the electrical network by the carbon members and increasing the thermal conductivity of the conductive composite material. and a metal powder for transferring electrical resistance heat generated by the carbon member to a surface of the heating unit, the conductive composite material having a base resin content of 60 to 72 wt %, a carbon member content of 10 wt % or more and 17 wt % or less to form the electrical network, a diameter of the metal powder of 10 to 100 nm, a metal powder content of 12 wt % or more and 22 wt % or less to increase the electrical network between the carbon members and increase the thermal conductivity of the conductive composite material, and a specific gravity of the conductive composite material (test result according to ASTM D792) of 0.8 to 1.3, and a specific resistance of 2 to 10 Ωmm 2 / m and the thermal conductivity is 156 to 235 kcal / mh℃.

[0019] According to yet another aspect of the present invention, there is provided a sheet-shaped heating element comprising: a matrix formed by press-molding a composite material obtained by mixing a non-electrically conductive resin and an electrically conductive material; and at least a pair of electric wires inserted into the matrix at a predetermined distance from each other and molded integrally with the matrix during the press-molding, wherein when a power source is applied so that the electric wires have a potential difference, heat is generated by electrical resistance generated from within the matrix.

[0020] According to yet another aspect of the present invention, a hot and cold water purifier using a sheet heating element is provided so as to come into contact with at least one surface of a hot water tank containing hot water, and includes a matrix formed by press-molding a composite material obtained by mixing a non-electrically conductive resin and an electrically conductive material, and at least a pair of electric wires inserted into the matrix at a predetermined distance from each other and molded integrally with the matrix during the press-molding, and generates heat due to electrical resistance generated from within the matrix when power is applied so that the electric wires have a potential difference.

[0021] According to yet another aspect of the present invention, a floor heating panel for a building using a sheet heating element is provided on the floor heating panel for the building, and includes a matrix formed by press-molding a composite material obtained by mixing a non-electrically conductive resin and an electrically conductive material, and at least a pair of electric wires inserted into the matrix at a predetermined distance from each other and molded integrally with the matrix during the press-molding, and when power is applied so that the electric wires have a potential difference, heat is generated by electrical resistance generated from inside the matrix.

[0022] According to yet another aspect of the present invention, there is provided a clothing care machine using a sheet heating element, which is provided in an ironing board for pressing clothing to remove wrinkles or for forming tucks in trousers, and includes a matrix formed by press-molding a composite material obtained by mixing a non-conductive resin and an electrically conductive material, and at least a pair of electric wires inserted into the matrix at a predetermined distance from each other and molded integrally with the matrix during the press-molding, and generates heat due to electric resistance generated from within the matrix when a power source is applied so that the electric wires have a potential difference.

[0023] According to yet another aspect of the present invention, a sheet-like heating element includes a heating portion in which a pair of electric wires are inserted into a matrix formed of a first material, spaced a predetermined distance from each other, and when power is applied, heat is generated by electrical resistance generated from within the matrix so that the electric wires have a potential difference, and a non-heating portion which is partitioned off from and integrally formed with the heating portion, and is formed of a second material having lower electrical conductivity than the first material.

[0024] According to yet another aspect of the present invention, a clothing care machine including a planar heating element includes an ironing board for applying pressure to clothing to remove wrinkles or to form tucks in trousers, the ironing board being divided into a heating section in which a pair of electric wires are inserted into a matrix formed of a first material at a predetermined distance from each other, and which generates heat due to electrical resistance generated from within the matrix when power is applied so that the electric wires have a potential difference, and a non-heating section which is partitioned and formed integrally with the heating section and is formed of a second material having lower electrical conductivity than the first material.

[0025] According to yet another aspect of the present invention, a hot and cold water purifier including a sheet-shaped heating element includes a sheet-shaped heating element arranged to contact at least one side of a hot water tank containing hot water, and the sheet-shaped heating element is divided into a heating portion, in which a pair of electric wires are inserted into a matrix formed of a first material at a predetermined distance from each other, and when power is applied, the electric wires have a potential difference, and the heating portion is formed integrally with the heating portion and is formed of a second material having lower electrical conductivity than the first material.

[0026] According to yet another aspect of the present invention, a floor heating panel for a building including a sheet heating element includes a sheet heating element provided on the floor heating panel of a building, and the sheet heating element is divided into a heating section, in which a pair of electric wires are inserted into a matrix formed of a first material at a predetermined distance from each other, and when power is applied, the electric wires have a potential difference, thereby generating heat due to electrical resistance generated from inside the matrix, and a non-heating section, which is partitioned and formed integrally with the heating section and is formed of a second material having lower electrical conductivity than the first material. Effect of the Invention

[0027] The sheet heating element of the present invention is configured such that a pair of electric wires are inserted inside a matrix formed by molding a base resin and a conductive material, and when power is applied, heat is generated by the electrical resistance generated from inside the matrix. This makes it simple in structure and easy to manufacture, while still providing a sufficient heating effect regardless of thermal conductivity.

[0028] In addition, the sheet heating element is divided into a heating section and a non-heating section, and the heating section and the non-heating section are manufactured integrally through a double injection molding method, which allows the production of sheet heating elements in a variety of shapes, while having the advantage of simplifying the manufacturing process and reducing manufacturing costs and time.

[0029] In addition, the conductive material includes a carbon member and a metal powder, and the conductive composite material is manufactured with the carbon member content being 10-17w%, the metal powder content being 12-22w%, and the base resin content being 60-72w%, which has the advantage that an electrical network can be easily formed by the carbon member, and electrical resistance heat generated by the carbon member can be easily transferred to the surface of the heating part by the metal powder. [Brief description of the drawings]

[0030] [Figure 1] 1 is a view showing an example of a sheet heating element according to a first embodiment of the present invention. [Diagram 2] 1 is a diagram illustrating a schematic diagram of a press molding method for a planar heating element according to a first embodiment of the present invention. [Diagram 3] 13 is a view showing an example of a hot and cold water purifier using a sheet heating element according to a second embodiment of the present invention. [Figure 4] 13 is a diagram showing an example of a floor heating panel for a building using a sheet heating element according to a third embodiment of the present invention. [Diagram 5] 13 is a diagram showing an example of a clothing care machine using a sheet heating element according to a fourth embodiment of the present invention. [Figure 6] 13 is a schematic view showing a double injection molding method for a planar heating element according to a fifth embodiment of the present invention. [Figure 7] 13 is a view illustrating a planar heating element according to a sixth embodiment of the present invention. [Figure 8] 13 is a diagram showing an example of a clothing care machine using a sheet heating element according to a seventh embodiment of the present invention. [Figure 9] 9 is a diagram showing the ironing board shown in FIG. 8. [Figure 10] 13 is a view showing an example of a hot and cold water purifier using a sheet heating element according to an eighth embodiment of the present invention. [Figure 11] 13 is a diagram showing an example of a floor heating panel for a building using a sheet heating element according to a ninth embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0031] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

[0032] FIG. 1 is a diagram showing an example of a sheet heating element according to a first embodiment of the present invention.

[0033] Referring to FIG. 1, a sheet heating element 10 according to a first embodiment of the present invention includes a heating part that generates heat through its surface when power is applied, and is formed in the form of a thin sheet or film.

[0034] The heating section has a pair of electric wires 12 inserted inside a matrix 11 made of a conductive composite material in which a base resin 11a and a conductive material 11b are mixed, and when power is applied, the conductive material forms an electrical network and generates heat.

[0035] The conductive composite material includes the conductive material 11b, the base resin 11a, a stabilizer, and other additives.

[0036] The conductive material 11b includes a carbon material and a metal powder.

[0037] The carbon member includes at least one of carbon fiber, carbon nanotube, and graphene. The carbon member is dispersed in the base resin and forms an electrical network. The content of the carbon member in the conductive composite material is 10 wt % or more and 17 wt % or less to form the electrical network. In the present embodiment, the carbon member is described as a mixture of carbon nanotubes (CNTs) and the graphene. The length of the carbon nanotubes is 1 to 100 μm. The mixture ratio of the graphene and the carbon nanotubes is preferably 1 wt %:20 wt %.

[0038] The metal powder is interposed between the carbon members to increase the electrical network of the carbon members and to increase the thermal conductivity of the conductive composite material, thereby transferring the electrical resistance heat generated by the carbon members to the surface of the heating part. If the metal powder is not interposed, the electrical resistance heat generated by the carbon members is not transferred to the surface of the heating part by the non-conductive resin, which has a very low thermal conductivity, and the thermal conductivity of the conductive composite material is reduced to a level similar to that of the non-conductive resin.

[0039] Therefore, the diameter of the metal powder in the conductive composite material is 10 to 100 nm, and the content of the metal powder is 12 w% or more to increase the electrical network between the carbon members and the thermal conductivity of the conductive composite material, and 22 w% or less to reduce the specific gravity of the conductive composite material. In this embodiment, the metal powder is described as being aluminum powder. However, the present invention is not limited thereto, and the conductive material may include a silver nanomaterial.

[0040] The base resin 11a includes a non-conductive resin including ABS, silicone, PE, PET, PP, and PDMS, and a conductive resin including PPy (polypyrrole).

[0041] In the present embodiment, the non-conductive resin is PP, and the conductive resin is PPy. The content of PPy in the base resin can be in the range of 0 to 10 wt %, and in the present embodiment, the mixing ratio of the PP and the PPy is 5 wt %:95 wt %. When the PPy is added to the base resin 11a, the electrical properties of the conductive composite material are improved. However, the present embodiment is not limited thereto, and the base resin 11a may be composed of only the non-conductive resin.

[0042] Meanwhile, the electric wires 12 are inserted into the matrix 11 at a predetermined distance from each other, and are molded integrally with the matrix during the press molding.

[0043] The electric wire 12 is composed of at least one pair. In this embodiment, an example will be described in which a pair of electric wires 12 is arranged inside the matrix 11. The electric wires 12 are arranged long in the longitudinal direction. The length and insertion position of the electric wires 12 can be changed in various ways.

[0044] The electric wire 12 uses at least one of an aluminum wire, a copper alloy wire, a copper wire, and a conductive composite wire. The conductive composite wire includes a carbon wire. In the present embodiment, the electric wire 12 is described as being a copper wire. However, the present invention is not limited thereto and may be applied to various types of wires as long as they can supply power. The electric wire 12 may be connected to a power supply device (not shown) provided outside the sheet heating element 10 to receive power.

[0045] In addition, the sheet heating element 10 may be connected to or equipped with a control unit (not shown) for supplying or cutting off power and controlling the temperature.

[0046] A method for manufacturing the sheet heating element according to the first embodiment of the present invention will now be described.

[0047] First, the carbon material, the aluminum powder, the base resin, the stabilizer and the adhesive are mixed in a predetermined ratio.

[0048] The content of the carbon member is set within a range of 10 to 17 w% with respect to the total content of the conductive composite material. The content of the carbon member is a parameter that affects the electrical conductivity, i.e., resistivity, of the conductive composite material. If the content of the carbon member is less than 10 w%, the electrical network of the carbon member is not well formed, and the electrical conductivity is reduced. If the electrical conductivity is too low, electricity does not flow, and electrical resistance heat is not generated. On the other hand, if the content of the carbon member exceeds 17 w%, the electrical conductivity does not increase any more, so that the carbon member is used at 17 w% or less to reduce costs. That is, in the present invention, in order to make the conductive composite material have an appropriate range of electrical conductivity, the content of the carbon member is preferably within a range of 10 to 17 w%. In particular, it is more preferable that the content of the carbon member is mixed at 12 to 15 w%.

[0049] In the present embodiment, the carbon member is described as using the carbon nanotube and the graphene as an example, and in particular, the mixture ratio of the graphene and the carbon nanotube is preferably 1w%:10w%.

[0050] Also, the content of the aluminum powder is set within a range of 12 to 22 w% with respect to the total content of the conductive composite material. The content of the aluminum powder is a parameter that affects the electrical conductivity and thermal conductivity of the conductive composite material. If the content of the aluminum powder is less than 12 w%, it cannot function as an electrical network between the carbon nanotubes, and it cannot fully perform the role of thermal conduction of transferring the electrical resistance heat generated by the carbon member to the surface of the heating unit. Meanwhile, if the content of the aluminum powder exceeds 22 w%, there is a problem that the specific gravity of the conductive composite material increases. Therefore, the content of the aluminum powder is preferably within a range of 12 to 22 w%. In particular, it is more preferable that the content of the aluminum powder is mixed at 15 to 20 w%. By adding the aluminum powder, the cost can be reduced and the electrical conductivity and thermal conductivity can be further improved compared to the case where only the carbon member is used.

[0051] In addition, in the conductive composite material, the content of the base resin is mixed at 60 to 72 w %, the content of the stabilizer is mixed at 0.1 to 0.6 w %, and the content of the adhesive is mixed at 0.4 to 2.1 w %.

[0052] In addition, the base resin is exemplified by adding the PPy to the PP. The content of the PPy in the base resin is 0 to 10 wt %. In particular, the content of the PPy is more preferably 5 wt %.

[0053] The conductive composite material mixed in the optimum ratio as described above is poured into the lower mold 22 that has been previously fabricated.

[0054] The composite material is poured into the lower mold 22, and the pair of electric wires 12 are inserted at a predetermined position. The pair of electric wires 12 are spaced apart from each other at a predetermined distance.

[0055] In the present embodiment, the conductive composite material is first introduced into the lower mold 22, and then the electric wire 12 is inserted, but the present invention is not limited thereto, and the conductive composite material may be introduced after the electric wire 12 is placed. In addition, when the conductive composite material is introduced first, the conductive composite material may be introduced after the electric wire 12 is inserted.

[0056] Thereafter, the upper mold 21 is pressurized at high temperature to form the sheet heating element 10 in which the wires 12 are integrally formed with the matrix 11.

[0057] Therefore, since the sheet heating element 10 having the electric wires 12 can be formed in a single press molding process, the manufacturing method is very simple and the manufacturing time and cost are reduced.

[0058] Furthermore, the sheet heating element 10 can be manufactured in various shapes and can be applied to a wider variety of products.

[0059] The conductive composite material manufactured by the above method was tested and the results are as follows.

[0060] The specific gravity of the conductive composite material (test result according to ASTM D792) is 0.8 to 1.3. The specific resistance of the conductive composite material is 2 to 10 Ωmm 2 By mixing and preparing the carbon nanotubes and the aluminum powder in an optimal ratio, the conductive composite material can have an optimal resistivity and appropriate electrical conductivity and thermal conductivity.

[0061] The thermal conductivity of the conductive composite material is 156 to 235 kcal / mh°C. The thermal conductivity can vary depending on the content of the aluminum powder, and in this embodiment, the content of the aluminum powder is set to a range of 12 to 22 w% so that the conductive composite material falls within the thermal conductivity range. Therefore, by mixing the aluminum powder, the thermal conductivity of the conductive composite material is increased, and the electrical resistance heat generated by the carbon member can be effectively transferred to the surface of the heating part.

[0062] The tensile strength of the conductive composite material (test results according to ASTM D638) is 180 to 200 kgf / cm 2 The tensile elongation (test result according to ASTM D638) is 22 to 27 wt%, and the flexural modulus (test result according to ASTM D790) is 1200 to 1300 kgf / cm 2 The flexural strength (ASTM D790 test results) is 200-220kgf / cm 2 It is.

[0063] The operation of the sheet heating element according to the first embodiment of the present invention configured as above will be described as follows.

[0064] When a power source is applied so that a potential difference is generated between the pair of electric wires 12, the conductive material forms an electric network inside the matrix 11, and heat is generated due to the electric resistance generated from within.

[0065] Therefore, heat can be generated from the entire surface of the sheet heating element 10 .

[0066] The sheet heating element according to the first embodiment of the present invention configured as above is manufactured by integrally providing the electric wire 12 inside the matrix 11 made of a conductive composite material, so that the structure is simple, the manufacturing method is very simple, and the manufacturing time and cost are reduced. That is, compared to the case where a separate electric wire is connected or a plurality of sheets and terminals are laminated, the number of steps is reduced and the manufacturing is easy.

[0067] Also, by applying power to the pair of electric wires 12 so as to create a potential difference, heat is generated by electrical resistance generated inside the matrix 11, which has the advantage that a sufficient heat generating effect can be obtained regardless of the thermal conductivity of the matrix 11 or the electric wires 12. That is, when a heat generating terminal is inserted inside the matrix, a sufficient heat generating effect can be obtained only if both the heat generating terminal and the matrix have high thermal conductivity, but in the present invention, heat is generated inside the matrix by inserting an electric wire that is not a heat generating terminal into the matrix and passing electricity through it, so that a sufficient heat generating effect can be obtained regardless of the thermal conductivity.

[0068] Meanwhile, FIG. 3 is a view showing an example of a hot and cold water purifier using a sheet heating element according to a second embodiment of the present invention.

[0069] Referring to FIG. 3, a hot and cold water purifier 200 using a sheet-shaped heating element 210 according to the second embodiment of the present invention includes a main body 201 and a hot water tank 202 provided inside the main body 201 and containing hot water. The sheet-shaped heating element 210 is provided so as to contact at least one side of the hot water tank 202, which is different from the first embodiment. Since the remaining configurations and functions are similar, the differences will be mainly described in detail.

[0070] In the following description, the sheet heating element 210 is provided to surround the outer periphery of the hot water tank 202. However, the present invention is not limited thereto, and the sheet heating element 210 may be applied to any surface that can transfer heat to the hot water tank 202, such as the bottom surface of the hot water tank 202.

[0071] The sheet heating element 210 is in the form of a thin sheet or film and is made of a flexible material, so that it can be easily attached to the hot water tank 202 .

[0072] The structure and manufacturing method of the sheet heating element 210 are the same as those of the first embodiment.

[0073] Meanwhile, FIG. 4 is a view showing an example of a floor heating panel for a building using a sheet heating element according to a third embodiment of the present invention.

[0074] Referring to FIG. 4, the floor heating panel 300 of a building using a sheet heating element 310 according to the third embodiment of the present invention is a panel for floor heating installed on the bottom surface of a building, and differs from the first embodiment in that the sheet heating element 310 is installed on the floor heating panel 300. The remaining configurations and functions are similar, so the differences will be mainly described in detail.

[0075] The sheet heating element 310 may be provided inside or on the upper surface of the floor heating panel 300 .

[0076] The sheet heating element 310 is in the form of a thin sheet or film, and at least one of the sheet heating element 310 may be provided on the floor heating panel 300 .

[0077] The sheet heating element 310 is in the form of a thin sheet or film, and at least one of them may be provided on the floor heating panel 300 .

[0078] The structure and manufacturing method of the sheet heating element 310 are the same as those of the first embodiment.

[0079] Meanwhile, FIG. 5 is a view showing an example of a clothes care machine using a sheet heating element according to a fourth embodiment of the present invention.

[0080] Referring to FIG. 5, a clothing management machine 400 using a sheet-shaped heating element 410 according to the fourth embodiment of the present invention includes a main body 420, a door 430, and an ironing board 440 provided on the door 430 to pressurize clothing to remove wrinkles or form tucks in pants. The difference from the first embodiment is that the sheet-shaped heating element 410 is provided on the ironing board 440. The remaining configurations and functions are similar, so the differences will be mainly described in detail.

[0081] The body 420 defines a space in which clothes can be placed, and is formed to have an open front.

[0082] The door 430 is formed so that the front surface of the body 420 can be opened and closed.

[0083] The door 430 is provided on its inner surface with a tweezers part 431, a support plate 432, a pressure plate 433 and the iron board 440.

[0084] The tweezers part 431 is a holder provided on the upper part of the inner surface of the door 430 and formed to be able to pick up the edge of the trousers (P).

[0085] The support plate 432 is a panel fixed to the inner surface of the door 430 and arranged to face the pants P caught by the tweezers part 431. The support plate 432 plays a role of supporting the pants P when the ironing board 440 and the pressing plate 433 press the pants P.

[0086] The pressure plate 433 is a panel that is rotatably connected to the support plate 432 and presses the iron board 440 in a direction toward the support plate 432 .

[0087] The ironing board 440 is disposed between the pressure plate 433 and the support plate 432 and is rotatably coupled to the support plate 432 .

[0088] The sheet heating element 410 is attached to the inside of the ironing board 440 or to the surface facing the trousers P. The sheet heating element 410 is in the form of a thin sheet or film, and at least one sheet heating element 410 may be provided.

[0089] The structure and manufacturing method of the sheet heating element 410 are the same as those of the first embodiment.

[0090] The sheet heating element is not limited to the above embodiment, and can also be applied to an iron plate for yakiniku.

[0091] Meanwhile, FIG. 6 is a schematic view showing a double injection molding method for a planar heating element according to a fifth embodiment of the present invention.

[0092] 6, a sheet heating element 510 according to a fifth embodiment of the present invention is divided into a heating portion 501 that generates heat through its surface when power is applied, and a non-heating portion 502 that does not generate heat when power is applied. That is, the sheet heating element 510 is formed such that the heating portion 501 and the non-heating portion 502 are integrally formed, but is divided into the heating portion 501, which is a region that generates heat, and the non-heating portion 502, which is a region that does not generate heat.

[0093] The heating portion 501 is integrally formed with the non-heating portion 502, but is made of a different material from the non-heating portion 502 and has a different electrical conductivity from the non-heating portion 502.

[0094] The heating section 501 has a pair of electric wires 12 inserted inside a matrix 11 made of a conductive composite material in which a base resin 11a and a conductive material 11b are mixed, and when power is applied, the conductive material forms an electrical network and generates heat.

[0095] The conductive composite material includes the conductive material 11b, the base resin 11a, a stabilizer and other adhesives.

[0096] The conductive material 11b includes a carbon material and a metal powder.

[0097] The carbon member includes at least one of carbon fiber, carbon nanotube, and graphene. The carbon member is dispersed in the base resin and forms an electrical network. The content of the carbon member in the conductive composite material is 10 wt % or more and 17 wt % or less to form the electrical network. In the present embodiment, the carbon member is described as a mixture of carbon nanotubes (CNTs) and the graphene. The length of the carbon nanotubes is 1 to 100 μm. The mixture ratio of the graphene and the carbon nanotubes is preferably 1 wt %:20 wt %.

[0098] The metal powder is interposed between the carbon members to increase the electrical network of the carbon members and to increase the thermal conductivity of the conductive composite material, thereby transferring the electrical resistance heat generated by the carbon members to the surface of the heating part. If the metal powder is not interposed, the electrical resistance heat generated by the carbon members is not transferred to the surface of the heating part by the non-conductive resin, which has a very low thermal conductivity, and the thermal conductivity of the conductive composite material is reduced to a level similar to that of the non-conductive resin.

[0099] Therefore, the diameter of the metal powder in the conductive composite material is 10 to 100 nm, and the content of the metal powder is 12 w% or more to increase the electrical network between the carbon members and the thermal conductivity of the conductive composite material, and 22 w% or less to reduce the specific gravity of the conductive composite material. In this embodiment, the metal powder is described as being aluminum powder. However, the present invention is not limited thereto, and the conductive material may include a silver nanomaterial.

[0100] The base resin 11a includes non-conductive resins including ABS, silicone, PE, PET, PP, and PDMS, and conductive resins including PPy.

[0101] In the present embodiment, the non-conductive resin is PP, and the conductive resin is PPy. The content of PPy in the base resin can be in the range of 0 to 10 wt %, and in the present embodiment, the mixing ratio of the PP and the PPy is 5 wt %:95 wt %. When the PPy is added to the base resin 11a, the electrical properties of the conductive composite material are improved. However, the present embodiment is not limited thereto, and the base resin 11a may be composed of only the non-conductive resin.

[0102] The non-heating part 502 is formed of a material having a lower electrical conductivity than the heating part 501. The non-heating part 502 is described as being made of only the non-conductive resin as an example. However, the non-heating part 502 is not limited thereto, and may be made of the same material as the base resin material of the heating part 501. The non-conductive resin of the heating part 501 and the non-conductive resin of the non-heating part 502 are made of the same material, so that interfacial separation is prevented when they are integrally molded.

[0103] The configuration of the electric wire 12 is applied in the same manner as in the first embodiment.

[0104] In addition, the sheet heating element 510 may be connected to or include a controller (not shown) for supplying or cutting off power and controlling the temperature.

[0105] A method for manufacturing the sheet heater according to the fifth embodiment of the present invention will now be described.

[0106] The sheet heating element 510 according to the fifth embodiment of the present invention configured as described above differs from the first embodiment in that the heating portion 501 and the non-heating portion 502 are manufactured by double injection molding, but the remaining configurations and functions are similarly applied.

[0107] In this embodiment, the mold 2 for the double injection molding includes a lower mold 2a and an upper mold 2b, and only the upper mold 2b is replaced as an example. That is, the upper mold 2b includes an upper mold for a heating part and an upper mold for a non-heating part. Therefore, the upper mold for the heating part (not shown) is disposed on the lower mold 2a, and the conductive composite material is poured to form the heating part 501. Thereafter, the upper mold for the non-heating part (not shown) is replaced on the lower mold 2a, and the non-heating part 502 can be formed by pouring the non-conductive resin.

[0108] First, the carbon material, the aluminum powder, the base resin, the stabilizer and the adhesive are mixed in a predetermined ratio to form a conductive composite material, which is then injected between the lower mold 2a and the upper mold for the heating part (not shown).

[0109] At this time, the pair of electric wires 12 are inserted into a predetermined position, and the mold 2 is heated to harden the conductive composite material.

[0110] In the present embodiment, the conductive composite material is first introduced into the mold 20, and then the electric wire 12 is inserted, but the present invention is not limited thereto, and it is also possible to place the electric wire 12 first and then introduce the conductive composite material. In addition, when the conductive composite material is introduced first, it is also possible to insert the electric wire 12 and then introduce the conductive composite material.

[0111] Therefore, the heating part 501 is formed in which the electric wire 12 is inserted into the matrix 11 formed of the conductive composite material.

[0112] Thereafter, the upper mold for the non-heating portion is substituted, and the non-conductive resin is injected between the lower mold 2a and the upper mold for the non-heating portion and cured.

[0113] Therefore, the non-heating portion 502 made of the non-conductive resin and molded integrally with the heating portion 501 is formed.

[0114] When the hardening is completed, the sheet heating element 510 is separated from the mold 2 .

[0115] Therefore, by manufacturing the sheet heating element 510, which is divided into the heating portion 501 and the non-heating portion 502, through a double injection molding process, it is possible to manufacture it in various shapes, and since the manufacturing process is simple, manufacturing time and costs are reduced.

[0116] Since the sheet heating element 510 is formed so that only a portion of it is made up of the heating portion 501, it can be manufactured in various shapes and can be applied to a wider variety of products.

[0117] In addition, by using the same material for the non-conductive resin contained in the heating portion 501 and the non-conductive resin contained in the non-heating portion 502, the boundary surface between the heating portion 501 and the non-heating portion 502 is not separated and is more firmly bonded and molded.

[0118] In addition, the carbon nanotubes, which are a conductive material included in the heating part 501, can act as a bridge connecting the boundary between the heating part 501 and the non-heating part 502, so that the heating part 501 and the non-heating part 502 can be bonded more firmly.

[0119] However, without being limited thereto, it is also possible to perform double injection molding by injecting a first material forming the matrix of the heating portion 501 and a second material forming the non-heating portion 502 into one mold, and the mold for the double injection molding can be applied in various ways.

[0120] Meanwhile, FIG. 7 is a schematic view of a sheet heating element according to a sixth embodiment of the present invention.

[0121] Referring to FIG. 7, the planar heating element 610 according to the sixth embodiment of the present invention is divided into a heating portion 601 and a non-heating portion 602. The non-heating portion 602 extends onto at least one of the left and right sides of the heating portion 601, which is different from the fifth embodiment. The remaining configurations and functions are similar, so the differences will be mainly described in detail.

[0122] The heating portion 601 is integrally formed with the non-heating portion 602, but is made of a different material from the non-heating portion 602 and has a different electrical conductivity from the non-heating portion 602.

[0123] The heating section 601 has a pair of electric wires 12 inserted inside a matrix 11 made of a conductive composite material in which a base resin 11a and a conductive material 11b are mixed, and when power is applied, the conductive material forms an electrical network and generates heat.

[0124] The non-heating part 602 is formed of a material having a lower electrical conductivity than the heating part 601. The non-heating part 602 is described as being made of only the non-conductive resin as an example. However, the non-heating part 602 is not limited thereto, and may be made of the same material as the base resin material of the heating part 601. The non-conductive resin of the heating part 501 and the non-conductive resin of the non-heating part 502 are made of the same material, so that interfacial separation is prevented when they are integrally molded.

[0125] The configurations of the heating portion 601, the non-heating portion 602, and the electric wire 12 are applied in the same manner as in the fifth embodiment. The manufacturing method of the sheet heating element is also applied in the same manner as in the fifth embodiment.

[0126] 8 is a diagram showing an example of a clothes care machine using a sheet heating element according to a seventh embodiment of the present invention, and FIG 9 is a diagram showing the ironing board shown in FIG 8.

[0127] 8 and 9, a clothing care machine 700 using a sheet heating element according to the seventh embodiment of the present invention includes a main body 701, a door 702, and an ironing board 705 provided on the door 702 for pressing clothes to remove wrinkles or to form tucks in trousers. The ironing board 705 is a sheet heating element divided into a heating section 710 and a non-heating section 720, which is different from the fifth embodiment. Since the remaining configurations and functions are similar, the differences will be mainly described in detail.

[0128] The main body 701 defines a space in which clothes can be placed, and is formed so that the front is open.

[0129] The door 702 is formed so that the front surface of the main body 701 can be opened and closed.

[0130] On the inner surface of the door 702, a tweezers part 703, a support plate 704, a pressure plate 706 and the iron board 705 are provided.

[0131] The tweezers part 703 is a holder provided on the upper part of the inner surface of the door 702 and formed to be able to pick up the edge of pants.

[0132] The support plate 704 is a panel fixed to the inner surface of the door 702 and arranged to face the pants caught by the tweezers part 703. The support plate 704 plays a role of supporting the pants when the ironing board 705 and the pressure plate 706 press the pants.

[0133] The pressure plate 706 is a panel that is rotatably connected to the support plate 704 and presses the iron board 705 in a direction toward the support plate 704 .

[0134] The ironing board 705 is disposed between the pressure plate 706 and the support plate 704 , and is rotatably coupled to the support plate 703 .

[0135] At least a portion of the ironing board 705 is formed of the sheet heating element, and in this embodiment, the ironing board 705 is described as being a sheet heating element.

[0136] The ironing board 705 is double injection molded with different materials so as to be divided into a heating part 710 and a non-heating part 720. In this embodiment, the ironing board 705 is described as having two heating parts 710 on both the left and right sides.

[0137] The configurations and functions of the heating part 710 and the non-heating part 720 are applied in the same manner as in the fifth embodiment, and the manufacturing method and operation method of the sheet heating element are applied in the same manner as in the fifth embodiment.

[0138] FIG. 10 is a view showing an example of a hot and cold water purifier using a sheet heating element according to an eighth embodiment of the present invention.

[0139] Referring to FIG. 10, the eighth embodiment of the present invention relates to a hot and cold water purifier 800 using a sheet heating element. The sheet heating element 810 is arranged to contact at least one side of the hot water tank 802, and is different from the fifth embodiment in that the remaining configurations and functions are similar, and therefore the differences will be mainly described in detail.

[0140] In the following description, the sheet heating element 810 is provided to surround the outer periphery of the hot water tank 802. However, the present invention is not limited thereto, and the sheet heating element 810 may be applied to any surface that can transfer heat to the hot water tank 802, such as the bottom surface of the hot water tank 802.

[0141] The sheet heating element 810 is divided into a heating portion 811 and a non-heating portion 812. That is, the remaining portions of the sheet heating element 810 except for the heating portion 811 correspond to the non-heating portion 812.

[0142] The configurations and functions of the heating portion 811 and the non-heating portion 812 are applied in the same manner as in the fifth embodiment. Also, the manufacturing method and operation method of the sheet heating element 810 are applied in the same manner as in the fifth embodiment.

[0143] Meanwhile, FIG. 11 is a view showing an example of a floor heating panel for a building using a sheet heating element according to a ninth embodiment of the present invention.

[0144] Referring to FIG. 11, a floor heating panel 900 of a building using a sheet heating element 910 according to the ninth embodiment of the present invention is a panel for floor heating installed on the bottom surface of a building, and differs from the first embodiment in that the sheet heating element 910 is installed on the floor heating panel 900. The remaining configurations and functions are similar, so the differences will be mainly described in detail.

[0145] The sheet heating element 910 may be provided inside or on the upper surface of the floor heating panel 900 .

[0146] The sheet heating element 910 is divided into a heating portion 911 and a non-heating portion 912. That is, the remaining portions of the sheet heating element 910 except for the heating portion 911 correspond to the non-heating portion 912.

[0147] The configurations and functions of the heating portion 911 and the non-heating portion 912 are applied in the same manner as in the fifth embodiment. Also, the manufacturing method and operation method of the sheet heating element 910 are applied in the same manner as in the fifth embodiment.

[0148] In the above embodiment, the content of the base resin, the content of the carbon member, and the diameter and content of the metal powder are described as examples, but are not limited thereto and may be changed. In addition, the values ​​of the specific gravity, resistivity, and thermal conductivity of the conductive composite material are also described as examples, but are not limited thereto.

[0149] The present invention has been described with reference to the embodiments shown in the drawings, but these are merely illustrative, and those skilled in the art will understand that various modifications and equivalent embodiments are possible. Therefore, the true technical scope of the present invention should be determined by the technical spirit of the claims. [Industrial Applicability]

[0150] According to the present invention, it is possible to manufacture a sheet heating element having a simple structure and reduced manufacturing costs and time, and a clothing care device, a hot and cold water purifier, and a floor heating panel for a building including the sheet heating element.

Claims

1. The conductive composite material is a mixture of a base resin and a conductive material. A pair of electric wires are inserted into the matrix, spaced apart from each other by a predetermined distance, and the heating unit generates heat by electric resistance generated from the inside of the matrix when a power source is applied so that the electric wires have a potential difference. The conductive material is A carbon member that is dispersed in the base resin and forms an electrical network; and a metal powder interposed between the carbon members to increase an electrical network formed by the carbon members and to increase the thermal conductivity of the conductive composite material, thereby transferring electrical resistance heat generated by the carbon members to a surface of the heating unit. The conductive composite material has a base resin content of 60 to 72 wt %; The content of the carbon member in the conductive composite material is 10 wt % or more but 17 wt % or less in order to form the electrical network; In the conductive composite material, the diameter of the metal powder is 10 to 100 nm, and the content of the metal powder is 12 wt % or more to increase the electrical network between the carbon members and increase the thermal conductivity of the conductive composite material, and is 22 wt % or less to reduce the specific gravity of the conductive composite material, The base resin is a non-conductive resin including ABS, silicone, PE, PET, PP, or PDMS; A conductive resin including PPy, The content of the conductive resin in the base resin is greater than 0 and less than or equal to 10 wt %; The specific gravity of the conductive composite material (test result according to ASTM D792) is 0.8 to 1.3, and the specific resistance is 2 to 10 Ωmm ２ / m and thermal conductivity is 156 to 235 kcal / mh°C.

2. The tensile strength of the conductive composite material (test results according to ASTM D638) is 180 to 200 kgf / cm ２ The sheet heating element according to claim 1 ,

3. The carbon member includes carbon nanotubes and graphene, The sheet heating element according to claim 1 , wherein a mixture ratio of the graphene and the carbon nanotubes is 1 wt %:10 wt %.

4. The carbon member includes at least one of a carbon fiber and a carbon nanotube, 2. The sheet heating element according to claim 1, wherein the carbon member has a length of 1 to 100 μm.

5. The sheet heating element according to claim 1 , wherein the metal powder includes aluminum powder.

6. A conductive composite material obtained by mixing a base resin and a conductive material is molded into a matrix into which a pair of electric wires are inserted at a predetermined distance from each other, and a heating section is included which generates heat due to electrical resistance generated from within the matrix when a power source is applied so that the electric wires have a potential difference, The conductive material is A carbon member that is dispersed in the base resin and forms an electrical network; and a metal powder interposed between the carbon members to increase an electrical network formed by the carbon members and to increase the thermal conductivity of the conductive composite material, thereby transferring electrical resistance heat generated by the carbon members to a surface of the heating unit. The conductive composite material has a base resin content of 60 to 72 wt %; The content of the carbon member in the conductive composite material is 10 wt % or more but 17 wt % or less in order to form the electrical network; In the conductive composite material, the diameter of the metal powder is 10 to 100 nm, and the content of the metal powder is 12 wt % or more to increase the electrical network between the carbon members and increase the thermal conductivity of the conductive composite material, and is 22 wt % or less to reduce the specific gravity of the conductive composite material, The conductive composite material has a specific gravity (test result according to ASTM D792) of 0.8 to 1.3, a specific resistance of 2 to 10 Ωmm 2 / m, and a thermal conductivity of 156 to 235 kcal / mh°C. The conductive composite material further comprises a stabilizer and an adhesive, The content of the stabilizer is 0.1 to 0.6 wt %; The sheet heating element has an adhesive content of 0.4 to 2.1 wt %.

7. The sheet heating element according to claim 1 , wherein the electric wire comprises at least one of an aluminum wire, a copper alloy wire, a copper wire, and a conductive composite wire.

8. The sheet heating element according to claim 1 , further comprising a non-heating portion that is partitioned and integrally formed with the heating portion and is made of a material having a lower electrical conductivity than the conductive composite material.

9. The wire is insert injection molded into the matrix; The sheet heating element according to claim 8 , wherein the heating portion and the non-heating portion are formed by double injection molding.

10. an ironing board for pressing garments to remove wrinkles or form tucks in trousers; The ironing board is A sheet heating element including a heating part in which a pair of electric wires are inserted into a matrix formed by molding a conductive composite material obtained by mixing a base resin and a conductive material at a predetermined distance from each other, and which generates heat by electric resistance generated from inside the matrix when a power source is applied so that the electric wires have a potential difference, The conductive material is A carbon member that is dispersed in the base resin and forms an electrical network; and a metal powder interposed between the carbon members to increase an electrical network formed by the carbon members and to increase the thermal conductivity of the conductive composite material, thereby transferring electrical resistance heat generated by the carbon members to a surface of the heating unit. The conductive composite material has a base resin content of 60 to 72 wt %; The content of the carbon member in the conductive composite material is 10 wt % or more but 17 wt % or less in order to form the electrical network; In the conductive composite material, the diameter of the metal powder is 10 to 100 nm, and the content of the metal powder is 12 wt % or more to increase the electrical network between the carbon members and increase the thermal conductivity of the conductive composite material, and is 22 wt % or less to reduce the specific gravity of the conductive composite material, The base resin is a non-conductive resin including ABS, silicone, PE, PET, PP, or PDMS; A conductive resin including PPy, The content of the conductive resin in the base resin is greater than 0 and less than or equal to 10 wt %; The specific gravity of the conductive composite material (test result according to ASTM D792) is 0.8 to 1.3, and the specific resistance is 2 to 10 Ωmm ２ / m and thermal conductivity is 156 to 235 kcal / mh°C.

11. The hot water tank includes a sheet heating element that is provided so as to be in contact with at least one surface of the hot water tank in which hot water is stored, The sheet heating element is The conductive composite material is a mixture of a base resin and a conductive material. A pair of electric wires are inserted into the matrix, spaced apart from each other by a predetermined distance, and the heating unit generates heat by electric resistance generated from the inside of the matrix when a power source is applied so that the electric wires have a potential difference. The conductive material is A carbon member that is dispersed in the base resin and forms an electrical network; and a metal powder interposed between the carbon members to increase an electrical network formed by the carbon members and to increase the thermal conductivity of the conductive composite material, thereby transferring electrical resistance heat generated by the carbon members to a surface of the heating unit. The conductive composite material has a base resin content of 60 to 72 wt %; The content of the carbon member in the conductive composite material is 10 wt % or more but 17 wt % or less in order to form the electrical network; In the conductive composite material, the diameter of the metal powder is 10 to 100 nm, and the content of the metal powder is 12 wt % or more to increase the electrical network between the carbon members and increase the thermal conductivity of the conductive composite material, and is 22 wt % or less to reduce the specific gravity of the conductive composite material, The base resin is a non-conductive resin including ABS, silicone, PE, PET, PP, or PDMS; A conductive resin including PPy, The content of the conductive resin in the base resin is greater than 0 and less than or equal to 10 wt %; The specific gravity of the conductive composite material (test result according to ASTM D792) is 0.8 to 1.3, and the specific resistance is 2 to 10 Ωmm ２ / m and thermal conductivity is 156 to 235 kcal / mh°C.

12. The heating element is provided in a floor heating panel of a building. The sheet heating element is The conductive composite material is a mixture of a base resin and a conductive material. A pair of electric wires are inserted into the matrix, spaced apart from each other by a predetermined distance, and the heating unit generates heat by electric resistance generated from the inside of the matrix when a power source is applied so that the electric wires have a potential difference. The conductive material is A carbon member that is dispersed in the base resin and forms an electrical network; and a metal powder interposed between the carbon members to increase an electrical network formed by the carbon members and to increase the thermal conductivity of the conductive composite material, thereby transferring electrical resistance heat generated by the carbon members to a surface of the heating unit. The conductive composite material has a base resin content of 60 to 72 wt %; The content of the carbon member in the conductive composite material is 10 wt % or more but 17 wt % or less in order to form the electrical network; In the conductive composite material, the diameter of the metal powder is 10 to 100 nm, and the content of the metal powder is 12 wt % or more to increase the electrical network between the carbon members and increase the thermal conductivity of the conductive composite material, and is 22 wt % or less to reduce the specific gravity of the conductive composite material, The base resin is a non-conductive resin including ABS, silicone, PE, PET, PP, or PDMS; A conductive resin including PPy, The content of the conductive resin in the base resin is greater than 0 and less than or equal to 10 wt %; The specific gravity of the conductive composite material (test result according to ASTM D792) is 0.8 to 1.3, and the specific resistance is 2 to 10 Ωmm ２ / m and thermal conductivity is 156 to 235 kcal / mh°C.

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