KR20180103216A - Flexible waterproof heater and manufacturing method thereof - Google Patents

Abstract

The present invention relates to a flexible waterproof heater having waterproofness and flexibility and a manufacturing method thereof. According to the present invention, the flexible waterproof heater includes a flexible film, an electrode wiring pattern of a metal material, a planar heating element, and a waterproof layer. The electrode wiring pattern is formed of metal on at least one surface of the flexible film. The planar heating element is formed by printing a heating element composition containing conductive particles containing carbon material, ceramic particles, and a mixed binder on the electrode wiring pattern, and receives power from the electrode wiring pattern to generate heat. The waterproof layer is formed to seal the flexible film, the electrode wiring pattern, and the planar heating element and provides waterproofness and flexibility.

Description

Technical Field [0001] The present invention relates to a flexible waterproof heater and a manufacturing method thereof,

The present invention relates to a waterproof heater and a manufacturing method thereof, and more particularly, to a waterproof and flexible waterproof heater and a manufacturing method thereof.

Generally, as a heater for heating water, a sheath heater, a ceramic heater, and a hot-wire heater are used.

Such conventional heaters have a structure in which a liquid contained in a container is installed in a jacket form on the outside of a container for holding water, which has a structural limitation and has a disadvantage of power consumption.

Conventional heaters have a structure in which a liquid contained in a container is heated by being installed in the form of a jacket on the outside of the container, so that the heat generation characteristic is lower than the power used.

 Conventional heaters have a limited range of applications because they have a narrow heating temperature range.

And since conventional heaters have low flexibility, there is a limitation in the shape of a product to which a heater can be applied.

Patent Registration No. 10-1637920 (Registered on July 4, 2014)

Accordingly, an object of the present invention is to provide a flexible waterproof heater for directly heating a liquid by being installed in a liquid such as water and a method of manufacturing the same.

Another object of the present invention is to provide a flexible waterproof heater that exhibits high heat generating characteristics with low power and a method of manufacturing the same.

It is still another object of the present invention to provide a flexible waterproof heater capable of designing various products according to a voltage to be used and a method of manufacturing the same.

It is another object of the present invention to provide a flexible waterproof heater that provides a high degree of freedom in product design and a method of manufacturing the same.

In order to achieve the above object, the present invention provides a flexible film having flexibility; An electrode wiring pattern of a metal material formed on one surface of the flexible film; A planar heating element which is formed by printing a heating element composition containing a carbon material as conductive particles on the electrode wiring pattern on one surface of the flexible film and generates heat by receiving power from the electrode wiring pattern; And a waterproof layer having a waterproof property and a flexibility by sealing the flexible film on which the planar heating element is formed.

Wherein the exothermic composition for forming the planar exothermic body comprises a mixed binder comprising hexamethylene diisocyanate, polyvinyl acetal and a phenolic resin; Conductive particles comprising at least two of carbon nanotube particles, graphite particles, silver powder, silver coated nickel powder and silver coated copper powder; And ceramic particles including glass particles or silicon particles.

The heating element composition for forming the planar heating element may include 5 to 30 parts by weight of a mixed binder, 0.7 to 60 parts by weight of a conductive particle, and 0.5 to 20 parts by weight of a ceramic particle based on 100 parts by weight of the heating element composition.

The flexible film may be made of a material selected from the group consisting of polyimide, polyethersulphone (PES), polyacrylate (PAR), polyetherimide (PEI), polyethylene naphthalate (PEN) (PET), polyphenylene sulfide (PPS), polyallylate, polycarbonate (PC), cellulose triacetate (CTA), or cellulose acetate propionate propinonate (CAP).

The material of the waterproof layer may be silicone resin or polyurethane.

The material of the electrode wiring pattern may be silver, aluminum, copper, nickel, or stainless steel.

Wherein the electrode wiring pattern comprises: a pair of electrode terminals formed with the planar heating element and sealed to the waterproof layer; And a pair of electrode pads connected to the pair of electrode terminals and protruding out of the waterproof layer to receive power.

The flexible waterproof heater according to the present invention may further include a flexible cover film covering one surface of the flexible film on which the planar heating element is formed. The cover film is sealed to the waterproof layer.

The present invention also relates to a flexible film having flexibility; An electrode wiring pattern of a metal material formed on both sides of the flexible film; A planar heating element which is formed by printing a heating element composition containing carbon material as conductive particles on electrode wiring patterns on both sides of the flexible film and generates heat by receiving electric power as the electrode wiring pattern; And a waterproof layer having a waterproof property and a flexibility by sealing the flexible film on which the planar heating element is formed.

The flexible waterproof heater according to the present invention may further include a flexible cover film covering both surfaces of the flexible film on which the planar heating element is formed.

The present invention also provides a method of manufacturing a flexible printed circuit board, comprising: forming an electrode wiring pattern of a metal material on a flexible film having flexibility; Forming a planar heating element by printing a planar heating element composition containing carbon material as conductive particles on a flexible film on which the electrode wiring pattern is formed; And sealing the flexible film on which the planar heating element is formed to form a waterproof layer having waterproof property and flexibility.

In the step of forming the electrode wiring pattern, an electrode wiring pattern of a metal material can be formed on at least one surface of the flexible film by a metal etching method.

In the step of forming the waterproof layer, the waterproof layer may be formed by one method such as in-mold, insert injection, and hot pressing.

Since the flexible waterproof heater according to the present invention has water resistance and flexibility, it can be used for directly heating the liquid by being installed in a liquid such as water. Therefore, the flexible waterproof heater according to the present invention can replace the existing jacket type heater.

INDUSTRIAL APPLICABILITY The flexible waterproof heater according to the present invention can exhibit high heat generation characteristics at low power because it includes an electrode made of a metal material and a planar heating element capable of driving a low voltage. Since the planar heating element is formed of a heating element composition in the form of a paint including metal powder, carbon particles, and ceramic particles, it has advantages of low specific resistance and excellent thermal conductivity, which is advantageous for low voltage driving and fast heating rate.

The flexible waterproof heater according to the present invention can instantaneously generate a high calorific value even at a low voltage of 3 to 4 V, so that it can be applied to various products.

Since the heating element composition of the flexible waterproof heater according to the present invention includes the carbon particles and the metal powder as the heating element, the energy efficiency and the heating speed can be increased as compared with the heating element composition including only the metal powder as the heating element.

Since the heating element composition includes a mixed binder including a phenolic resin, an acetal resin, an isocyanate resin or an epoxy resin together with the conductive particles, the heat resistance can be maintained even at a temperature of 200 ° C or higher. Accordingly, the flexible waterproof heater according to the first embodiment can provide a flexible waterproof heater including a planar heating element having a small resistance change with temperature and having high heating behavior and stability.

Since the planar heating element formed of the heating element composition including the carbon nanotube particles and the graphite particles is a black body, the additional energy efficiency can be improved due to the blackbody radiation.

The heating element composition can provide a flexible waterproof heater capable of heating at a low voltage and a low electric power with low resistivity and easy thickness control.

Since the heating element composition is capable of screen printing, roll to roll gravure printing, roll to roll comma coating, flexo printing and offset printing, it is advantageous for mass production of the flexible waterproof heater according to the present invention, can do.

Since the flexible waterproof heater according to the present invention can be designed to have various heat capacities by controlling the thickness and the volume of the waterproof layer, it is possible to design various products according to the use voltage.

Since the flexible waterproof heater according to the present invention has flexibility, a high degree of freedom in product design can be provided.

1 is a plan view showing a flexible waterproof heater according to a first embodiment of the present invention.
2 is a sectional view taken along the line 2-2 in Fig.
FIGS. 3 to 9 are views showing steps of a manufacturing method of the flexible waterproof heater according to the first embodiment of the present invention.
10 is a cross-sectional view showing a flexible waterproof heater according to a second embodiment of the present invention.
11 is a cross-sectional view showing a flexible waterproof heater according to a third embodiment of the present invention.
12 is a sectional view showing a flexible waterproof heater according to a fourth embodiment of the present invention.

In the following description, only parts necessary for understanding embodiments of the present invention will be described, and descriptions of other parts will be omitted to the extent that they do not disturb the gist of the present invention.

The terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary meanings and the inventor is not limited to the meaning of the terms in order to describe his invention in the best way. It should be interpreted as meaning and concept consistent with the technical idea of the present invention. Therefore, the embodiments described in the present specification and the configurations shown in the drawings are merely preferred embodiments of the present invention, and are not intended to represent all of the technical ideas of the present invention, so that various equivalents And variations are possible.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[First Embodiment]

1 is a plan view showing a flexible waterproof heater according to a first embodiment of the present invention. 2 is a sectional view taken along the line 2-2 in Fig.

Referring to FIGS. 1 and 2, the flexible waterproof heater 100 according to the first embodiment provides both waterproof property and flexibility.

The flexible waterproof heater 100 according to the first embodiment includes a flexible film 10, an electrode wiring pattern 20 made of a metal, an area heating element 30, and a waterproof layer 50. Here, the flexible film 10 is a flexible plastic film. The electrode wiring pattern 20 is formed on the upper surface 13 of the flexible film 10. The planar heating element 30 is formed by printing a heating element composition containing carbon material as conductive particles on the electrode wiring pattern 20 on the upper surface 13 of the flexible film 10, It accepts and generates heat. The waterproof layer 50 seals the flexible film 20 on which the planar heating elements 30 are formed, and has waterproof property and flexibility. At this time, the heating element composition forming the planar heating element 30 includes a mixed binder, conductive particles and ceramic particles. The mixed binder may include hexamethylene diisocyanate, polyvinyl acetal, and phenol resin. The conductive particles include at least two of carbon nanotube particles, graphite particles, silver powder, silver-coated nickel powder, and silver-coated copper powder. And the ceramic particles include glass particles or silicon particles.

The flexible waterproof film 100 according to the first embodiment may further include a cover film 40. [ The cover film 40 covers the upper surface 13 of the flexible film 10 on which the planar heating element 30 is formed and is a flexible plastic film. The cover film 40 is also sealed by the waterproof layer 50.

The flexible waterproof heater 100 according to the first embodiment has a structure in which the planar heating elements 30 are formed inside the films 10 and 40 based on the flexible films 10 and 40 and the films 10 and 40 ) Is protected by a waterproof layer (50) having flexibility.

The flexible waterproof heater 100 according to the first embodiment can be used as a portable warmer driven at DC 3 to 4 V that can be driven by the auxiliary battery or as a high output heater designed with a high thermal density, no.

The detailed structure of the flexible waterproof heater 100 according to the first embodiment will be described in detail as follows.

The flexible film 10 is a plastic substrate made of insulating material and has an upper surface 13 and a lower surface 11 opposite to the upper surface 13. The flexible film 10 is used as a base substrate on which the electrode wiring pattern 20 and the surface heating element 30 are formed and provides flexibility to the flexible waterproof heater 100. For example, as the material of the flexible film 10, a material such as polyimide, polyethersulphone (PES), polyacrylate (PAR), polyetherimide (PEI), polyethyelenene napthalate PEN, polyethyeleneterephthalate (PET), polyphenylene sulfide (PPS), polyallylate, polycarbonate (PC), cellulose triacetate (CTA), or cellulose acetate propionate Cellulose acetate propinonate (CAP) may be used and is not limited to those listed. The flexible film 10 can be appropriately selected according to the application field or temperature at which the flexible waterproof heater 100 is used.

The electrode wiring pattern 20 is formed on the upper surface 13 of the flexible film 10 and supplies power to the surface heating element 30 from the outside. The electrode wiring pattern 20 may be formed by laminating a metal layer on the upper surface 13 of the flexible film 10 and then patterning it by an etching method. The electrode wiring pattern 20 is formed of a metal material so as to minimize a voltage drop. Silver, aluminum, copper, nickel, or stainless steel may be used as the metal material forming the electrode wiring pattern 20. [

The electrode wiring pattern 20 may include a pair of electrode terminals 27 and a pair of electrode pads 29. The pair of electrode terminals 27 is formed with a planar heating element 30 and is sealed to the waterproof layer 50. The pair of electrode pads 29 are respectively connected to the pair of electrode terminals 27 and protruded out of the waterproof layer 50 to receive power. At this time, the pair of electrode terminals 27 may be formed in a straight line so as to face each other. A pair of electrode pads 29 are connected to one ends of the pair of electrode terminals 27, and a cable 60 for supplying power is connected. A cable 60 for supplying positive power is connected to one of the pair of electrode pads 29 and a cable 60 for supplying power is connected to the other side.

The planar heating element 30 is formed so as to connect the pair of electrode terminals 27 of the electrode wiring pattern 20. The planar heating element 30 is formed by printing a heating element composition so as to connect a pair of electrode terminals 27, followed by drying and curing. As the printing method of the heating element composition, screen printing, gravure printing (to roll to roll gravure printing), comma coating (to roll to roll comma coating), flexo, imprinting, offset printing and the like can be used. The drying and curing may be carried out at 100 ° C to 180 ° C.

The heating element composition forming the planar heating element 30 includes a mixed binder, conductive particles, and ceramic particles. In order to form the planar heating element 30, the heating element composition to be injected into the printing process further includes an organic solvent and a dispersant, in addition to the mixed binder, the conductive particles and the ceramic particles.

The heating element composition comprises 5 to 30 parts by weight of the mixed binder, 0.7 to 60 parts by weight of the conductive particles, 0.5 to 20 parts by weight of the ceramic particles, 29 to 80 parts by weight of the organic solvent and 0.5 to 5 parts by weight of the dispersing agent per 100 parts by weight of the heating element composition .

The conductive particles include carbon particles or metal powder having conductivity. As the carbon particles, carbon nanotube particles or graphite particles can be used. As the metal powder, powders of silver, copper or nickel may be used. For example, the conductive particles may include 0.1 to 5 parts by weight of carbon nanotube particles, 0.1 to 20 parts by weight of graphite particles or 10 to 60 parts by weight of metal powder with respect to 100 parts by weight of the exothermic composition.

The carbon nanotube particles can be selected from single-walled carbon nanotubes, double-walled carbon nanotubes, multi-walled carbon nanotubes, or mixtures thereof. For example, the carbon nanotube particles may be multi wall carbon nanotubes. When the carbon nanotube particles are multi-walled carbon nanotubes, the diameter may be 1 nm to 20 nm, and the length may be 1 to 100 mu m.

The graphite particles may have a diameter of 1 탆 to 25 탆 and a thickness of 1 nm to 25 탆.

The metal powders include powders of silver, copper or nickel. In the case of silver powder, it may have the form of a flake, a sphere, a polygonal plate, a rod, or the like. As the copper powder, silver coated Cu powder and nickel coated Cu powder can be used. As the nickel powder, silver coated Ni powder may be used.

When the area heating element 30 is formed of a heating element composition containing carbon particles and metal powder, the metal powder forms a main electrical network, and the space between the metal powders is filled with carbon particles to form a three-dimensional random network structure.

As described above, the heating element composition includes the carbon particles and the metal powder, so that the energy efficiency and heat generation rate of the surface heating element 30 can be increased. That is, the metal powder has no blackbody radiation function. However, by including carbon particles in the heating element composition, the black body radiation function can be realized. The heat resistance of the planar heating element 30 can be increased due to the carbon particles. Due to the carbon particles, the heat generation rate and energy efficiency of the surface heating element 30 can be increased.

The resistivity of the area heating element 30 can be determined by the content of carbon particles or metal powder in the total solid content. For example, it is possible to control the resistivity by only carbon particles up to the area of 1 ㅧ 10 ^-2 Ωcm, but further introduction of metal powder is required in the region below that. The surface heating element 30 may have a resistivity of 9 ㅧ 10 ^-2 to 1.1 ㅧ 10 ^-3 Ωcm.

The ceramic particles increase the heat capacity of the surface heating element 30. [ By raising the heat capacity of the flexible waterproof heater 100, it is possible to suppress the problem that the temperature of the flexible waterproof heater 100 drops suddenly. As such ceramic particles, glass particles or silicon particles can be used.

The mixed binder includes at least two of a phenol resin, an acetal resin, an isocyanate resin and an epoxy resin so as to have heat resistance even at a temperature of about 300 ° C. For example, the mixed binder includes at least two of epoxy, epoxy acrylate, hexamethylene diisocyanate, polyvinyl acetal, and phenolic resin

For example, the mixed binder may have a mixed form of hexamethylene diisocyanate, polyvinyl acetal resin, and phenolic resin. Wherein the mixed binder includes 10 to 150 parts by weight of a polyvinyl acetal resin and 100 to 500 parts by weight of a phenolic resin based on 100 parts by weight of hexamethylene diisocyanate. When the phenolic resin is 100 parts by weight or less based on 100 parts by weight of hexamethylene diisocyanate, the heat resistance is lowered. When the amount is more than 500 parts by weight, the flexibility of the surface heat emission element 30 is lowered and the brittleness is strengthened.

By increasing the heat resistance of the mixed binder in this manner, even when the area heating element 30 is heated to a high temperature of 300 deg. C or less, the resistance change or breakage of the area heating element 30 can be suppressed.

Here, the phenolic resin means a phenolic compound including phenol and phenol derivatives. For example, phenol derivatives include p-cresol, o-Guaiacol, Creosol, Catechol, 3-methoxy-1,2-benzenediol (3- methoxy-1,2-benzenediol, Homocatechol, Vinylguaiacol, Syringol, Iso-eugenol, Methoxyeugenol, o- Cresol, 3-methyl-1,2-benzenediol and (z) -2-methoxy-4- (1-propenyl) -phenol 2-methoxy-4- (1-propenyl) -phenol, 2,6-dimethoxy-4- (2-propenyl) Phenol, 3,4-dimethoxy-Phenol, 4-ethyl-1,3-benzenediol, Resole phenol, 4-methyl-1,2-benzenediol, 1,2,4-benzene triol, 2-methoxy-6-methylphenol 2-Methoxy-6-methylphenol, 2-Methoxy-4-vinylphenol or 4-ethyl-2-methoxy- , Etc. It is not.

The organic solvent is for dispersing the conductive particles, the ceramic particles and the binder. The organic solvent is selected from the group consisting of Carbitol acetate, Butyl carbotol acetate, DBE (dibasic ester), Ethyl Carbitol, Ethyl Carbitol Acetate, Diethylene glycol methyl ether, dipropylene glycol methyl ether, cellosolve acetate, butyl cellosolve acetate, butanol, and octanol.

Meanwhile, various methods commonly used may be applied to the dispersion process. For example, ultrasonic treatment (roll-milling), bead milling or ball milling Lt; / RTI >

The dispersant is used for smoother dispersion of the conductive particles and ceramic particles. Examples of the dispersant include conventional dispersants used in the art such as BYK, amphoteric surfactants such as Triton X-100, and ionic surfactants such as SDS Can be used.

The heating element composition may further comprise 0.1 to 5 parts by weight of a silane coupling agent as an additive to 100 parts by weight of the heating element composition.

The silane coupling agent functions as an adhesion promoter for enhancing the adhesion force between the resins when the heating element composition is compounded. The silane coupling agent may be an epoxy-containing silane or a mercaptan-containing silane. Examples of such silane coupling agents include epoxy-containing 2- (3,4-epoxycyclohexyl) -ethyltrimethoxysilane, 3-glycidoxytrimethoxysilane, 3-glycidoxypropyltriethoxysilane, (Aminoethyl) 3-aminopropylmethyldimethoxysilane, N-2 (aminoethyl) 3-aminopropyltrimethoxysilane having an amine group and N-2 , N-2 (aminoethyl) 3-aminopropyltriethoxysilane, 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, 3-triethoxysilyl- Propylamine, N-phenyl-3-aminopropyltrimethoxysilane, 3-mercaptopropylmethyldimethoxysilane, 3-mercaptopropyltriethoxysilane, isocyanate, 3-isocyanate propyltriethoxysilane, and the like, but is not limited thereto.

The cover film 40 is laminated so as to cover the upper surface 13 of the flexible film 10 on which the surface heating element 30 is formed. As the material of the cover film 40, the same material as that of the flexible film 10 can be used for stable bonding with the flexible film 10. The cover film 10 may be laminated to the flexible film 10 by a hot pressing or a laminating method. The electrode wiring pattern 20 and the surface heating element 30 positioned between the cover film 40 and the flexible film 10 are protected from the external environment through the lamination of the cover film 40 and the flexible film 10. On the other hand, when laminating the cover film 40 and the flexible film 10, an insulating adhesive can be interposed between the cover film 40 and the flexible film 10.

When the cover film 40 and the flexible film 10 are joined together, the electrode pads 29 of the electrode wiring pattern 20 are laminated except for the electrode pads 29. That is, the pair of electrode pads 29 are exposed out of the lidded cover film 40 and the flexible film 10.

The waterproof layer 50 seals the lidded cover film 40 and the flexible film 10 and forms a laminated cover film 40 and an electrode wiring pattern 20 located inside the flexible film 10, (30). As the material of the waterproof layer 50, polyurethane or silicone resin that provides flexibility to the flexible waterproof heater 100 may be used.

The waterproof layer 50 may be formed by one method such as inmold, insert injection, and hot pressing. For example, when the waterproofing layer 50 is formed in an in-mold shape, a two-part type polyurethane or a two-part type silicone resin may be used as a material for forming the waterproof layer 50.

A cable 60 capable of receiving power is connected to a pair of electrode pads 29 of the electrode wiring pattern 20 exposed outside the waterproof layer 50.

Thus, since the flexible waterproof heater 100 according to the first embodiment includes the electrode wiring pattern 20 made of metal and the planar heating element 30 capable of driving the low voltage, high heating performance can be exhibited at low power . Since the planar heating element 30 is formed of a heating element composition in the form of a paint containing metal powder, carbon particles and ceramic particles, it has advantages of low specific resistance and excellent thermal conductivity, which is advantageous for low voltage driving and fast heating rate.

The flexible waterproof heater 100 according to the first embodiment can instantaneously generate a high calorific value even at a low voltage of 3 to 4 V, so that it can be applied to various products.

Since the heating element composition of the flexible waterproof heater 100 according to the first embodiment includes carbon particles and metal powder as a heating element, energy efficiency and heat generation rate can be increased as compared with a heating element composition including only metal powder as a heating element.

Since the heating element composition includes a mixed binder including a phenolic resin, an acetal resin, an isocyanate resin or an epoxy resin together with the conductive particles, the heat resistance can be maintained even at a temperature of 200 ° C or higher. Accordingly, the flexible waterproof heater 100 according to the first embodiment can provide a heater with high heat-generating behavior and high stability due to a small change in resistance with temperature.

Since the planar heating element 30 formed of the heating element composition including carbon nanotube particles and graphite particles is a black body, additional energy efficiency can be improved due to blackbody radiation.

The heating element composition can provide a flexible waterproof heater 100 that has a low resistivity and is easy to control its thickness, and can be heated at a low temperature and a low power.

Since the heating element composition is capable of screen printing, roll to roll gravure printing, roll to roll comma coating, flexo printing and offset printing, it is advantageous for mass production of the flexible waterproof heater 100 according to the first embodiment, Can be solved.

Since the flexible waterproof heater 100 according to the first embodiment can be designed to have various heat capacities by controlling the thickness and volume of the waterproof layer 50, it is possible to design various products according to the use voltage of the power source. For example, the flexible waterproof heater 100 can be implemented in various forms such as a cylindrical shape, a flat shape, a spherical shape, and a disk shape. In the case of a product requiring rapid heating, it is possible to reduce the heat capacity by reducing the thickness of the waterproof layer 50 of the flexible waterproof heater 100.

Since the flexible waterproof heater 100 according to the first embodiment has flexibility, a high degree of freedom in product design can be provided.

A manufacturing method of the flexible waterproof heater 100 according to the first embodiment will be described with reference to FIGS. 3 to 9. FIG. 3 to 9 are views showing respective steps of the method for manufacturing the flexible waterproof heater 100 according to the first embodiment of the present invention.

First, as shown in FIG. 3, a flexible film base material 15 is prepared. The flexible film base material 15 provides a flexible film to be used for at least one flexible waterproof heater. The flexible film base material 15 is separated into a flexible film of a flexible waterproof heater through a dividing process to be performed later.

Next, as shown in FIG. 4, an electrode wiring pattern 20 is formed on the upper surface 13 of the flexible film base material 15. That is, a metal layer is formed on the upper surface 13 of the flexible film material 15. The metal layer is etched to form the electrode wiring pattern 20. The electrode wiring pattern 20 includes a pair of electrode terminals 27 and a pair of electrode pads 29.

Next, as shown in FIG. 5, a heating element composition is printed on the upper surface 13 of the flexible film base material 15, followed by drying and curing to form the surface heating element 30. At this time, the planar heating elements 30 are formed on the upper surface 13 of the flexible film material 15 between the pair of electrode terminals 27 formed at regular intervals and between the pair of electrode terminals 27, And the electrode terminal 27 is connected. A pair of electrode pads (29) of the electrode wiring pattern (20) are exposed to the outside of the surface heating element (30). In the first embodiment, the example in which the area heating element 30 is formed in the shape of a rectangular plate is described, but the present invention is not limited thereto.

As the printing method of the surface heat emission element 30, screen printing, gravure printing (to roll to roll gravure printing), comma coating (to roll to roll comma coating), flexo, imprinting, offset printing and the like can be used. Drying and curing can be carried out at 100 ° C to 180 ° C.

Next, as shown in Figs. 6 and 7, the cover film base material 41 is joined to the upper surface 13 of the flexible film base material 15. As a method of laminating the cover film base material 41, a hot pressing or laminating method can be used.

A window 43 is formed in the cover film base material 41 so as to correspond to a pair of electrode pads 29 so that a pair of electrode pads 29 of the electrode wiring pattern 20 are exposed. The pair of electrode pads 29 are exposed to the outside through the window 43 of the cover film base material 41 when the cover film base material 41 is bonded to the flexible film base material 15. [

7 and 8, a portion where the electrode wiring pattern 20 and the surface heating element 30 are formed from the laminated flexible film base material 15 and the cover film base material 41 (hereinafter referred to as "semi-finished product" ). A laser cutting or punching method can be used as a method of separating semi-finished products.

The flexible film base material 15 and the cover film base material 41 are formed from the flexible film 10 and the cover film 40 constituting the flexible waterproof heater according to the first embodiment through a separation process.

The semi-finished product is protected by the flexible film 10 and the cover film 40 on which the pair of electrode terminals 27 of the surface heat emission element 30 and the electrode wiring pattern 20 are laminated, And the pair of electrode pads 29 are exposed out of the laminating flexible film 10 and the cover film 40.

1 and 2, the flexible waterproof heater 100 according to the first embodiment is formed by sealing the lapped flexible film 10 and the lid film 40 to form the waterproof layer 50, Can be manufactured. As the sealing method, in-mold, insert injection or hot pressing method can be used. When the waterproofing layer 50 is formed in an in-mold shape, a two-component polyurethane or a two-component silicone resin may be used as a material for forming the waterproof layer 50.

The pair of electrode pads 29 of the electrode wiring pattern 20 are exposed outside the waterproof layer 50. A power supply cable 60 is connected to each of the pair of electrode pads 29.

[Second Embodiment]

On the other hand, in the first embodiment, the cover film 40 is laminated on the flexible film 10, but the present invention is not limited thereto. For example, as shown in Fig. 10, the cover film may not be laminated.

10 is a cross-sectional view showing a flexible waterproof heater 200 according to a second embodiment of the present invention.

Referring to Fig. 10, the flexible waterproof heater 200 according to the second embodiment has a structure in which the cover film is removed from the flexible waterproof heater (100 in Fig. 2) according to the first embodiment. That is, the flexible waterproof heater 200 according to the second embodiment includes the flexible film 10, the electrode wiring pattern 20, the planar heating element 30, and the waterproof layer 50. An electrode wiring pattern (20) is formed on the upper surface (13) of the flexible film (10). The planar heating element 30 is formed so as to be connected to the electrode wiring pattern 20. The waterproof layer 50 is formed to seal the flexible film 10, the electrode wiring pattern 20, and the planar heating element 30.

The waterproof layer 50 is formed so as to seal the flexible film 10, the electrode wiring pattern 20 and the planar heating element 30 so that the flexible film 10, the electrode wiring pattern 20 and the planar heating element 30 ) From the external environment.

[Third Embodiment]

On the other hand, in the first and second embodiments, the example in which the electrode wiring pattern 20 and the planar heating element 30 are formed on the upper surface 13 of the flexible film 10 is described, but the present invention is not limited thereto. The electrode wiring pattern 20 and the planar heating element 30 may be formed on the lower surface 11 and the upper surface 13 of the flexible film 10 as shown in Fig.

11 is a cross-sectional view showing a flexible waterproof heater 300 according to a third embodiment of the present invention.

11, the flexible waterproof heater 300 according to the third embodiment includes a flexible film 10, an electrode wiring pattern 20, an area heating element 30, a cover film 40, and a waterproof layer 50 do. The flexible film 10, the electrode wiring pattern 20, the planar heating element 30, the cover film 40 and the waterproof layer 50 are made of the same material as that described in the description of the flexible waterproof heater according to the first embodiment Therefore, detailed description is omitted.

The electrode wiring patterns 20 are formed on the lower surface 11 and the upper surface 13 of the flexible film 10, respectively. The electrode wiring pattern 20 is formed by a lower wiring pattern 21 formed on the lower surface 11 of the flexible film 10 and an upper wiring pattern 23 formed on the upper surface 13 of the flexible film 10 . The lower wiring pattern 21 and the upper wiring pattern 23 may be formed symmetrically up and down with the flexible film 10 as a center.

The planar heating element 30 is formed by printing a heating element composition on the electrode wiring patterns 20 on both sides 11 and 13 of the flexible film 10 and receives electric power as an electrode wiring pattern 20 to generate heat. The planar heating element 30 includes a lower surface heating element 31 formed on the lower surface 11 of the flexible film 10 and an upper surface heating element 33 formed on the upper surface 13 of the flexible film 10 do. The lower surface heating element 31 and the upper surface heating element 33 may be formed symmetrically up and down with the flexible film 10 as a center.

The cover film 40 is laminated so as to cover both sides 11 and 13 of the flexible film 10 on which the area heating element 30 is formed. As the material of the cover film 40, the same material as that of the flexible film 10 can be used for stable bonding with the flexible film 10. The cover film 40 includes a lower cover film 47 covering the lower surface 11 of the flexible film 10 and an upper cover film 49 covering the upper surface 13 of the flexible film 10.

The waterproof layer 50 seals the lidded cover film 40 and the flexible film 10 and forms a laminated cover film 40 and an electrode wiring pattern 20 located inside the flexible film 10, (30).

[Fourth Embodiment]

On the other hand, in the third embodiment, the cover film 40 is laminated on the flexible film 10, but the present invention is not limited thereto. For example, as shown in Fig. 12, the cover film may not be laminated.

12 is a sectional view showing a flexible waterproof heater 400 according to a fourth embodiment of the present invention.

Referring to Fig. 12, the flexible waterproof heater 400 according to the fourth embodiment has a structure in which the cover film is removed from the flexible waterproof heater (300 of Fig. 11) according to the third embodiment. That is, the flexible waterproof heater 400 according to the fourth embodiment includes the flexible film 10, the electrode wiring pattern 20, the planar heating element 30, and the waterproof layer 50. The electrode wiring patterns 20 are formed on both sides 11 and 13 of the flexible film 10. [ The planar heating element 30 is formed on both surfaces 11 and 13 of the flexible film 10 so as to be connected to the electrode wiring pattern 20. The waterproof layer 50 is formed to seal the flexible film 10, the electrode wiring pattern 20, and the planar heating element 30.

Since the flexible waterproof heaters 300 and 400 have the structure in which the planar heating elements 30 are formed on both sides 11 and 13 of the flexible film 10 as in the third and fourth embodiments, Heat can be generated at a higher temperature in a shorter time than a flexible waterproof heater (100,200).

It should be noted that the embodiments disclosed in the present specification and drawings are only illustrative of specific examples for the purpose of understanding, and are not intended to limit the scope of the present invention. It will be apparent to those skilled in the art that other modifications based on the technical idea of the present invention are possible in addition to the embodiments disclosed herein.

10: Flexible film
11: Lower surface
13: upper surface
15: Flexible film base material
20: electrode wiring pattern
21: Lower wiring pattern
23: upper wiring pattern
27: Electrode terminal
29: Electrode pad
30: Planar heating element
31: Lower surface heating element
33: upper surface heating element
40: Cover film
41: Cover film base material
43: Window
47: Lower cover film
49: Upper cover film
50: Waterproof layer
60: Cable
100, 200, 300, 400: Flexible waterproof heater

Claims (13)

A flexible film having flexibility;
An electrode wiring pattern of a metal material formed on one surface of the flexible film;
A planar heating element which is formed by printing a heating element composition containing a carbon material as conductive particles on the electrode wiring pattern on one surface of the flexible film and generates heat by receiving power from the electrode wiring pattern; And
A waterproof layer having a waterproof property and a flexibility by sealing the flexible film on which the planar heating element is formed;
Flexible waterproof heater including. The method according to claim 1, wherein the exothermic composition for forming the planar heat-
A mixed binder comprising hexamethylene diisocyanate, polyvinyl acetal, and phenolic resin;
Conductive particles comprising at least two of carbon nanotube particles, graphite particles, silver powder, silver coated nickel powder and silver coated copper powder; And
Ceramic particles comprising glass particles or silicon particles;
Flexible waterproof heater including. The method according to claim 2, wherein the exothermic composition forming the planar heating element
And 5 to 30 parts by weight of a mixed binder, 0.7 to 60 parts by weight of conductive particles, and 0.5 to 20 parts by weight of ceramic particles with respect to 100 parts by weight of the heating element composition. The method of claim 3,
The flexible film may be made of a material selected from the group consisting of polyimide, polyethersulphone (PES), polyacrylate (PAR), polyetherimide (PEI), polyethylene naphthalate (PEN) (PET), polyphenylene sulfide (PPS), polyallylate, polycarbonate (PC), cellulose triacetate (CTA), or cellulose acetate propionate propinonate (CAP). < / RTI > 5. The method of claim 4,
Wherein the material of the waterproof layer is a silicone resin or polyurethane. 6. The method of claim 5,
Wherein the material of the electrode wiring pattern is silver, aluminum, copper, nickel, or stainless steel. 7. The semiconductor device according to claim 6,
A pair of electrode terminals formed with the surface heating element and sealed to the waterproof layer; And
A pair of electrode pads connected to the pair of electrode terminals and protruding out of the waterproof layer to receive power;
Wherein the flexible waterproof heater comprises: 8. The method of claim 7,
Further comprising a flexible cover film covering one side of the flexible film on which the planar heating element is formed,
Wherein the cover film is sealed to the waterproof layer. A flexible film having flexibility;
An electrode wiring pattern of a metal material formed on both sides of the flexible film;
A planar heating element which is formed by printing a heating element composition containing carbon material as conductive particles on electrode wiring patterns on both sides of the flexible film and generates heat by receiving electric power as the electrode wiring pattern; And
And a waterproof layer having a waterproof property and a flexibility by sealing the flexible film on which the planar heating element is formed,
The exothermic composition for forming the planar heat-
A mixed binder comprising hexamethylene diisocyanate, polyvinyl acetal, and phenolic resin;
Conductive particles comprising at least two of carbon nanotube particles, graphite particles, silver powder, silver coated nickel powder and silver coated copper powder; And
Ceramic particles comprising glass particles or silicon particles;
Flexible waterproof heater including. 10. The method of claim 9,
And a flexible cover film covering both sides of the flexible film on which the planar heating element is formed,
Wherein the cover film is sealed to the waterproof layer. Forming an electrode wiring pattern of a metal material on a flexible film having flexibility;
Forming a planar heating element by printing a planar heating element composition containing carbon material as conductive particles on a flexible film on which the electrode wiring pattern is formed; And
And sealing the flexible film on which the planar heating element is formed to form a waterproof layer having waterproof property and flexibility,
The exothermic composition for forming the planar heat-
A mixed binder comprising hexamethylene diisocyanate, polyvinyl acetal, and phenolic resin;
Conductive particles comprising at least two of carbon nanotube particles, graphite particles, silver powder, silver coated nickel powder and silver coated copper powder; And
Ceramic particles comprising glass particles or silicon particles;
Wherein the water-repellent heater is a water-repellent material. 12. The method according to claim 11, wherein, in the step of forming the electrode wiring pattern,
Wherein an electrode wiring pattern of a metal material is formed on at least one surface of the flexible film by a metal etching method. 13. The method according to claim 12, wherein, in the step of forming the waterproof layer,
Wherein the waterproof layer is formed by one of in-mold, insert injection, and hot pressing.

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