KR20110089505A - Ice tray and manufacturing method thereof - Google Patents

Abstract

PURPOSE: An ice tray and a manufacturing method thereof are provided to shorten separation time of solid from an ice tray by uniformly transferring heat to solid. CONSTITUTION: An ice tray comprises a first dielectric coated layer(20), a heating coated layer, an electrode layer and a second dielectric coated layer. The first dielectric coated layer is coated on all surfaces of an ice holding unit. The heating coated layer is formed on the top of the first dielectric coated layer. The electrode layer supplies power to the heating coated layer. The second dielectric coated layer is formed on the top of the heating coated layer and the electrode layer.

Description

ICE TRAY AND MANUFACTURING METHOD THEREOF

The present invention relates to an ice tray and a method for manufacturing the same, which can reduce power consumption by uniformly transferring heat to a solid to shorten a time for separating the solid.

In general, a refrigerator is provided with a plurality of storage compartments for freezing or refrigerating food, and one side of the storage compartment is formed to open and store food.

The refrigerator may be provided with an ice maker in the refrigerator body or the refrigerator door so that the liquid is made of a solid.

Since the ice making apparatus should be located in a low temperature environment, the ice making apparatus should be formed to be insulated from the outside, and a flow path may be formed at the side of the ice making apparatus and the side of the refrigerator to allow the cold air of the freezing compartment to be introduced or discharged.

An ice tray may be provided in the ice making apparatus, in which cold air is supplied and a process of solidifying liquid into a solid occurs. For example, water filled in the ice tray is coagulated with ice by cold air.

Solids formed in the ice tray can be easily separated from the ice tray by being slightly melted by the heat generating ice tray.

Conventionally, a coil heater or a sheath heater is inserted in the lower side of the ice tray to transfer heat to the ice. However, since heat generated from the coil heater or the sheath heater is transferred to the ice only through the ice tray, there is a problem that the heat transfer efficiency is lowered.

In addition, the coil heater or the sheath heater is heated unevenly, causing a difference in the melting time of the ice formed in the ice tray, thereby increasing the power consumption of the refrigerator required to completely separate the ice from the ice tray, and a plurality of ice from the ice tray. There is a problem that can not be separated at the same time.

In addition, Korean Patent Publication No. 2009-119639 discloses an ice tray in which a conductive ball, which is carbon fiber, is placed on a frame of a film mixed inside polyvinyl butylene. This technology used a film containing conductive balls, which are carbon fibers, to transfer heat to the ice, but these films had to be manufactured in the same form as the ice tray by vacuum forming, so that parts were added and the manufacturing process was complicated. Do. In addition, since the film is manufactured by vacuum forming, the film is stretched in the manufacturing process, so that the thickness of the upper fixing part becomes thick and the lower tension part becomes thin such that the film does not generate the same heat as a whole. It may be.

As a result, the ice may not be uniformly supplied with heat or there may be safety issues with current leakage. In addition, when the film is formed, the film is not closely adhered to the mold due to the poor size, causing defects, and the film type has a problem that it is difficult to closely adhere to the mold.

The present invention is a first insulating coating layer coated on all sides of the ice container, a heat generating coating layer formed on the upper surface of the first insulating coating layer, an electrode layer for supplying power to the heating coating layer and the second insulating coating layer formed on the top surface of the heating coating layer and the electrode layer It is an object to provide an included ice tray.

It is another object of the present invention to provide an ice tray capable of uniformly transferring heat to the solidified solid to shorten the time for the solid to be separated from the ice tray.

It is another object of the present invention to provide a method for producing an ice tray.

1. An ice tray comprising an ice container and a heat generating layer provided on the container.

2. The ice tray of 1 above, wherein the exothermic coating layer is formed on the inner surface, the outer surface or the inner surface and the outer surface of the ice receiver.

3. In the above 1, wherein the exothermic coating layer is formed by applying a composition containing 0.1-20% by weight of the conductor, 1-40% by weight of the binder and 50-80% by weight of the solvent to the receiver.

4. The ice tray according to 3 above, wherein the conductor is carbon nanotubes or carbon fibers.

5. The ice tray according to the above 1, wherein a first insulation coating layer is formed between the receiver and the heating coating layer.

6. The ice tray of claim 5, wherein the first insulation coating layer is formed to cover all sides of the receiver.

7. The ice tray according to the above 1, wherein a second insulating coating layer is formed on the heating coating layer to cover an electrode layer for supplying power to the coating layer.

8. according to any one of the above 5 to 7, wherein the first and second insulating coating layer is 10-20% by weight polyurethane resin, 30-60% by weight synthetic rubber, 20-30% by weight polyvinyl chloride and solvent 10 Ice tray formed of an insulating coating solution composition containing -20% by weight.

9. In the above 6, the electrode layer is gold (Au), aluminum (Al), copper (Cu), platinum (Pt), rhodium (Rh), platinum-rhodium alloy (Pt-Rh), chromium (Cr) and silver -Ice tray consisting of one or more selected from the group consisting of palladium (Ag-Pd).

10. Applying an exothermic coating composition comprising 0.1-20% by weight of conductor, 1-40% by weight of binder and 50-80% by weight of solvent to the inner, outer or inner and outer sides of the ice receiver. The manufacturing method of the ice tray to make.

11. The method according to the above 10, further comprising the step of applying the insulating coating liquid composition to the front surface of the ice receptor before applying the exothermic coating liquid composition.

12. The method of claim 11, further comprising attaching an electrode on the exothermic coating solution after applying the exothermic coating solution composition.

13. In the above 12, after the step of attaching the electrode manufacturing method of the ice tray further comprising the step of applying an insulating coating liquid composition to cover both the heating coating layer and the electrode.

14. In the above 13, wherein the exothermic coating liquid composition is prepared by dispersing 0.1-20% by weight of the conductor in 50-80% by weight of the solvent and then adding 1-40% by weight of the binder to the dispersion Way.

15. In the above 10 or 14, the conductor is carbon nanotube or carbon fiber ice tray manufacturing method.

16. In the above 12, the electrode is gold (Au), aluminum (Al), copper (Cu), platinum (Pt), rhodium (Rh), platinum-rhodium alloy (Pt-Rh), chromium (Cr) and silver -Ice tray manufacturing method consisting of one or more selected from the group consisting of palladium (Ag-Pd).

The ice tray of the present invention transmits heat uniformly to the solid to shorten the time for the solid to be separated from the ice tray, thereby reducing power consumption and separating multiple solids at the same time.

In addition, the ice tray of the present invention is more excellent in heat transfer efficiency when the exothermic coating layer is provided in the groove (inner side) where the solid is located.

In addition, the ice tray of the present invention does not apply the exothermic film as in the prior art, but provides a exothermic coating layer as a composition, and thus the manufacturing process is simple, and exothermic occurs uniformly in front of the exothermic coating layer.

1 is a cross-sectional view of an ice tray according to an embodiment of the present invention.

The present invention provides an ice container and a first insulating coating layer coated on all sides of the container, a heating coating layer formed on the first insulating coating layer, an electrode layer for supplying power to the heating coating layer, and a second insulating layer formed on the top surface of the heating layer and the electrode layer. By including a coating layer, evenly applied to the corners that are difficult to apply to conventional heating film in the ice tray and its manufacturing method that can uniformly transfer heat to the solidified solid to shorten the time that the solid is separated from the ice tray It is about.

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail.

1 is a cross-sectional view of an ice tray according to an embodiment of the present invention.

As shown in FIG. 1, the ice tray 1 of the present invention includes a first insulating coating layer 20, a heating coating layer 30, an electrode layer 40, and a second insulating coating layer 50 on an ice container 10. It is provided.

The ice container 10 is formed with a groove for receiving a liquid or a solid, and the shape of the groove may include a shape of all polygons having an opening such as a rectangle and a semicircle.

In addition, the material of the ice container 10 is preferably a good thermal conductivity, for example, aluminum or synthetic resin.

The insulating coating layers 20 and 50 are coated with an insulating coating liquid composition containing a synthetic resin and a solvent having excellent insulating properties between the ice receiver 10 and the exothermic coating layer, and the insulating coating liquid composition is 10 to 20% by weight of polyurethane resin, synthetic It is preferred to include 30 to 60% by weight of rubber, 20 to 30% by weight of polyvinyl chloride and 10 to 20% by weight of solvent.

At this time, when the content of the polyurethane resin is less than 10% by weight, the insulation and waterproofing is lowered, and when the content is more than 20% by weight, the waterproofing is lowered.

In addition, when the content of polyvinyl chloride is less than 20% by weight, the insulation is lowered, and when the content is more than 30% by weight, substances that harm the human body are released when the ice tray is heated.

If the content of the synthetic rubber is less than 30% by weight, the insulation is lowered, and if the content is more than 60% by weight, the adhesion to the laminated surface is lowered.

The first insulating coating layer 20 is a layer coated to cover all the surfaces such as the inner surface and the outer surface of the ice receiver 10 to prevent the discharge of current to the outside and increase the adhesion with the adhesive surface. , The ice container 10 is applied to a thickness of 5 to 250 ㎛.

Here, the inner surface is the surface of the grooved side, and the outer surface means the surface of the side where the groove is not formed.

In addition, the first insulation coating layer 20 is formed when the material of the ice receptor lacks insulation performance and when the adhesion between the ice receptor and the exothermic coating liquid composition is insufficient. When the material of the ice receiver satisfies the insulation and adhesiveness, Can be omitted.

In addition, the second insulation coating layer 50 is coated on the top surface of the heat generating coating layer 30 and the electrode layer 40 to be coated to cover the heat generating coating layer 30 and the electrode layer 40 to a thickness of 5 to 250 μm. do.

When the thickness of the first insulating coating layer 20 is less than 5 μm, when only the first coating layer 20 is formed on the outer surface of the ice container 10, electricity is discharged to the outside through the ice container 10, and the ice container and heat generation Adhesion with the coating layer may be lowered, and when the thickness is greater than 250 μm, the coating may be dropped and the manufacturing cost of the ice tray increases.

In addition, when the thickness of the second insulating coating layer 20 is less than 5 ㎛, electricity is discharged to the outside and the waterproofing performance is lowered. When the thickness is greater than 250 ㎛, the coating film may be dropped and the time is delayed until the solid is separated. do.

The exothermic coating layer 30 is coated on the first insulating coating layer 20 with an exothermic coating solution composition containing 0.1 to 20 wt% of the conductor, 1 to 40 wt% of the binder (based on 30% solids), and 50 to 80 wt% of the solvent. Layer.

The surface on which the exothermic coating layer 30 is formed is the first insulating coating layer 20 on the inner surface, the outer surface, or the inner surface and the outer surface of the first insulating coating layer 20 on which all surfaces of the ice container 10 are coated. The heat generating coating layer 30 is formed on the upper surface. Although it is preferable to be provided on the inner surface of the ice container 10 in consideration of the time for separating solids, power consumption, heat transfer efficiency, etc., the outer surface, or the inner surface of the ice container 10 and It may be provided on the outer surface.

In this case, the conductor is carbon nanotube or carbon fiber.

Carbon nanotubes (CNT) is a kind of carbon nanofibers, and the hexagonal network made of carbon consists of a single layer or a multilayer coaxial tube.

The average diameter of the carbon nanotubes used in the exothermic coating liquid composition is 100 nm or less, preferably 0.7 to 100 nm, and the average length is 1,000 μm or less, preferably 2 nm to 1,000 μm, and is multi-walled, double-walled, or single-walled. Carbon nanotubes having a structure may be used alone or in combination of two or more thereof.

When the average diameter of the carbon nanotubes is more than 100 nm in average diameter, the conductivity is lowered, the dispersibility is lowered when the exothermic coating liquid composition is prepared, there is a problem that a thick coating.

In addition, when the average length of the carbon nanotubes is more than 1,000 ㎛ occurs a problem that the dispersibility is greatly reduced during the preparation of the coating liquid.

The average length of the carbon fibers is preferably 1,000 µm or less, preferably 5 to 1,000 µm.

If the average length of the carbon fiber is more than 1,000 ㎛ occurs a problem that the dispersibility is much lowered during the production of the coating liquid.

In the exothermic coating liquid composition, the content of the conductor is 0.1 to 20% by weight, preferably 0.1 to 14% by weight, and when the content is less than 0.1% by weight, the electrical conductivity decreases, so that it is difficult to generate heat, and the content is more than 20% by weight. In some cases, dispersibility is poor, and in some cases, fever is severe and in others, fever is not generated.

The binder uses one or two or more selected from polyurethane resins, vinyl resins, epoxy resins, polyester resins, and melamine resins.

When the content of the binder (based on 30% solids) is less than 1% by weight, the adhesive strength with the insulating coating layers 20 and 50 is lowered. When the content is more than 40% by weight, the flowability of the exothermic coating liquid composition is difficult to apply. The electrical conductivity is lowered.

The thickness of the exothermic coating layer 30 is 1 μm or more, preferably 1 to 250 μm. If the thickness is less than 1 μm, there is a problem that the coating film is dropped off, and the coating layer is too thin may cause a problem of uneven heat distribution. In addition, too thick thickness consumes a lot of power.

The solvent used in the insulating coating liquid composition and the exothermic coating liquid composition is one or two or more selected from dimethylformamide, N-methyl-2-pyrrolidone, dimethylacetamide, dimethyl sulfoxide, methyl ethyl ketone, chloroform and pyridine.

The electrode layer 40 is provided to supply power to the heating coating layer 30. Specifically, for example, gold (Au), aluminum (Al), copper (Cu), platinum (Pt), rhodium (Rh), It is formed of one or two or more electrodes selected from a platinum-rhodium alloy (Pt-Rh), chromium (Cr) and silver-palladium (Ag-Pd).

As shown in FIG. 1, the electrode layer 40 may be formed on one side of the heat generating coating layer 30, or may be formed on the entire surface or part of the heat generating coating layer 30.

When power is applied to the electrode layer 40, a current flows through the electrode coating layer 30 to generate the heat generation of the coating layer 30.

In the ice tray 1, a process of solidifying a liquid into a solid occurs by cold air, and the liquid may be a drinkable liquid form material such as water and juice, and the solid may be ice with frozen liquid.

In addition, the present invention provides an ice tray manufacturing method.

First, 0.1 to 20% by weight of carbon nanotubes or carbon fibers are dispersed in 50 to 80% by weight of a solvent. Ultrasonic dispersion method or ball milling method is used for uniform dispersion, and it is 10 to 100 minutes with an ultrasonic disperser having a frequency of 10 to 60 KHz and a power of 100 to 700 W depending on the capacity of carbon nanotubes or carbon fibers and the amount of solvent. It is applied during the carbon nanotubes or carbon fibers in the solvent to be uniformly dispersed.

1 to 40% by weight of a binder (based on a solid content of 30%) was added to the prepared dispersion solution, and the exothermic coating solution composition was prepared by milling with a 3-roll mill for 40 to 70 minutes. At this time, it is preferable that the binder added is diluted with a solvent.

In addition, an insulation coating solution composition including 10 to 20 wt% of polyurethane resin, 30 to 60 wt% of synthetic rubber, 20 to 30 wt% of polyvinyl chloride, and 10 to 20 wt% of solvent is prepared.

When the composition is prepared as described above, after washing the ice receptor 10 in which the groove containing the liquid or solid is formed, the insulating coating liquid composition is applied to the entire surface to form the first insulating coating layer 20.

The exothermic coating solution composition is applied to the inner surface, the outer surface, or the upper surface of the insulating coating layer 20 on the inner and outer surfaces of the first insulating coating layer 20 formed on the ice container 10 to form the exothermic coating layer 30. . Preferably, the exothermic coating layer 30 is formed on the inner surface of the ice receiver 10.

In order to supply power to the formed heating coating layer 30, an electrode is attached to one side, a front surface, or a partial surface of the heating coating layer 30, for example.

By forming the second insulating coating layer 50 to cover both the heating coating layer 30 and the electrode, current is not emitted to the outside, and the solids can be easily separated. In this case, the second insulating coating layer 50 is formed only on the inner surface of the ice container as shown in FIG. 1 when the exothermic coating layer 30 is formed only on the inner surface of the ice container 10. In addition, when the exothermic coating layer 30 is formed only on the outer surface of the ice container 10, the exothermic coating layer 30 is formed only on the outer surface of the ice container 10, and the exothermic coating layer 30 is the inner and outer surface of the ice container 10. When formed in both the inner surface and the outer surface of the ice receiver 10 is formed.

Hereinafter, preferred examples are provided to aid the understanding of the present invention, but the following examples are merely for exemplifying the present invention, and it will be apparent to those skilled in the art that various changes and modifications can be made within the scope and spirit of the present invention. It is natural that such variations and modifications fall within the scope of the appended claims.

[Example]

Preparation Example 1 Insulating Coating Composition

18% by weight of polyurethane resin, 51% by weight of synthetic rubber, 21% by weight of polyvinyl chloride, and 10% by weight of a solvent were stirred to prepare an insulating coating solution composition.

Preparation Example 2 Preparation of Exothermic Coating Liquid Composition

Ultrasonic disperser with a frequency of 20 KHz and 700 W of power after adding 1.7 wt% of carbon nanotubes with an average diameter of 10 nm and an average length of 5 μm to 60 wt% of dimethylformamide. -700 S) was dispersed for 30 minutes to prepare a dispersion.

38.3% by weight of a polyurethane resin (30% solids) diluted in dimethylformamide was added to the prepared dispersion, followed by stirring for 20 minutes with a stirrer and milling for 60 minutes with a 3-roll mill to prepare an exothermic coating solution composition.

Preparation Example 3 Exothermic Coating Liquid Composition

In the same manner as in Preparation Example 2, 60% by weight of dimethylformamide, 10% by weight of carbon nanotubes, and 30% by weight of polyurethane resin (solid content: 30%) were used.

Preparation Example 4 Exothermic Coating Liquid Composition

The same process as in Preparation Example 2, Instead of carbon nanotubes, carbon fibers having an average length of 3,000 μm were used.

Preparation Example 5 Preparation of Exothermic Coating Liquid Composition

In the same manner as in Preparation Example 2, 50% by weight of dimethylformamide, an average diameter of 120nm, 22% by weight of carbon nanotubes having an average length of 1,500㎛, polyurethane resin (solid content of 30%) 28% by weight Was used.

Preparation Example 6 Exothermic Coating Solution Composition

In the same manner as in Preparation Example 3, 50 wt% of dimethylformamide and 30 wt% of carbon fiber having an average length of 3,000 μm were used by adding 20 wt% of polyurethane resin (solid content of 30%).

Example 1.

The insulating coating liquid composition prepared in Preparation Example 1 was applied to all surfaces of the washed ice container to have a dry coating thickness of 100 μm, thereby forming a first insulating coating layer. Thereafter, the exothermic coating solution composition prepared in Preparation Example 2 was applied to the inner surface of the ice receiver to have a dry coating thickness of 30 μm, thereby forming an exothermic coating layer. The ice tray was manufactured by laminating a plate-like copper on one side of the exothermic coating layer and applying the insulating coating solution composition prepared in Preparation Example 1 so that the dry coating thickness was 100 μm on the exothermic coating layer and the upper surface of the copper. At this time, the compositions were applied by spray or brush.

Example 2.

The same procedure as in Example 1, except that the exothermic coating solution composition prepared in Preparation Example 3 was used instead of the exothermic coating solution composition prepared in Preparation Example 2.

Example 3.

The same procedure as in Example 1 was carried out, but the exothermic coating solution composition prepared in Preparation Example 4 was used instead of the exothermic coating solution composition prepared in Preparation Example 2.

Example 4.

In the same manner as in Example 1, but after forming the exothermic coating layer on the outer surface of the ice receptor, the insulating coating liquid composition prepared in Preparation Example 1 was applied to the exothermic coating layer and the copper upper surface to form a second insulating coating layer.

Example 5.

In the same manner as in Example 1, but after forming the heat-generating coating layer on the inner surface and the outer surface of the ice receptor, the second insulating coating layer was formed by applying the insulating coating liquid composition prepared in Preparation Example 1 on the heating coating layer and the upper copper surface.

Comparative Example 1.

In the same manner as in Example 1, but instead of the exothermic coating solution composition prepared in Preparation Example 2, the exothermic coating solution composition prepared in Preparation Example 5 was used so that the dry coating thickness is 0.5㎛.

Comparative Example 2

In the same manner as in Example 3, but instead of the exothermic coating solution composition prepared in Preparation Example 4, the exothermic coating solution composition prepared in Preparation Example 6 was applied so that the dry coating thickness is 0.5㎛, the thickness of the second insulating coating layer 100 Was made to be μm.

Comparative Example 3

After placing the film mixed with the conductive ball of carbon fiber inside the polyvinyl butylene, which is an adhesive film, on the mold, an ice tray was prepared by providing a protective layer to protect the film.

Example 1 Example 2 Example 3 Example 4 Example 5 Comparative Example 1 Comparative Example 2 Comparative Example 3 First Insulation Coating Layer
(Thickness μm) Production Example 1
(100) Production Example 1
(100) Production Example 1
(100) Production Example 1
(100) Production Example 1
(100) Production Example 1
(100) Production Example 1
(100) - Exothermic coating layer
(Thickness μm) Preparation Example 2
(30) Preparation Example 3
(30) Preparation Example 4
(30) Preparation Example 4
(30) Preparation Example 4
(30) Preparation Example 5
(0.5) Preparation Example 6
(0.5) Conductive Ball + Polyvinyl Butylene Electrode layer Copper Copper Copper Copper Copper Copper Copper - Second insulating coating layer
(Thickness μm) Production Example 1
(100) Production Example 1
(100) Production Example 1
(100) Production Example 1
(100) Production Example 1
(100) Production Example 1
(100) Production Example 1
(100) Protective layer

Test example.

1. Surface resistance: The surface resistance was measured using a surface resistance measuring instrument (Mitsubishi Chemical, MCP-T610) after forming up to the exothermic coating layer. At this time, Comparative Example 3 was equipped with a film and then measured the surface resistance.

2. Solid Separation Time: The time from the application of power (220VAC) to the electrode layer until the solids were separated from the ice tray was measured.

Example 1 Example 2 Example 3 Example 4 Example 4 Comparative Example 1 Comparative Example 2 Comparative Example 3 Surface resistance
(Ohm / sq) 80 50 300 700 250 1,500 4,000 5,000 Solid separation
Time in seconds 140 130 185 260 150 380 540 600

As shown in Table 2, it can be seen that the ice trays of Examples 1 to 5 manufactured according to the present invention have a low surface resistance compared to Comparative Examples 1 to 3, so that the current flows smoothly. In addition, Examples 1 to 5 show that the solid (ice) is separated from the ice tray in a short time, so that it is uniformly generated on the front surface of the heat generating coating layer.

In this case, Examples 1 to 5, Comparative Examples 1 and 2 were measured before forming the second insulating coating layer, that is, even after forming the exothermic coating layer in order to measure the accurate surface resistance.

1: ice tray 10: ice receptor
20: first insulating coating layer 30: heat generating coating layer
40: electrode layer 50: second insulating coating layer

Claims (16)

An ice tray comprising an ice container and a heat generating layer provided on the container.
The ice tray of claim 1, wherein the exothermic coating layer is formed on an inner face, an outer face, or an inner face and an outer face of the ice receiver.
The ice tray of claim 1, wherein the exothermic coating layer is formed by applying a composition including 0.1-20 wt% of a conductor, 1-40 wt% of a binder, and 50-80 wt% of a solvent to the receiver.
The ice tray of claim 3, wherein the conductor is carbon nanotubes or carbon fibers.
The ice tray of claim 1, wherein a first insulating coating layer is formed between the receiver and the heat generating coating layer.
The ice tray of claim 5, wherein the first insulation coating layer is formed to cover all sides of the receiver.
The ice tray according to claim 1, wherein a second insulating coating layer is formed on the exothermic coating layer to cover an electrode layer for supplying power to the coating layer.
The method according to any one of claims 5 to 7, wherein the first and second insulating coating layer is 10-20% by weight polyurethane resin, 30-60% by weight synthetic rubber, 20-30% by weight polyvinyl chloride and solvent 10-20 Ice tray formed of an insulating coating liquid composition containing weight%.
The method according to claim 6, wherein the electrode layer is gold (Au), aluminum (Al), copper (Cu), platinum (Pt), rhodium (Rh), platinum-rhodium alloy (Pt-Rh), chromium (Cr) and silver-palladium Ice tray consisting of one or more selected from the group consisting of (Ag-Pd).
Ice comprising applying an exothermic coating composition comprising 0.1-20% by weight of conductor, 1-40% by weight of binder and 50-80% by weight of solvent to the inner, outer or inner and outer sides of the ice receiver How to make a tray.
The method of claim 10, further comprising applying the insulating coating liquid composition to the entire surface of the ice container before applying the exothermic coating liquid composition.
The method of claim 11, further comprising attaching an electrode on the exothermic coating solution after applying the exothermic coating solution composition.
The method of claim 12, further comprising applying an insulating coating liquid composition to cover both the heating coating layer and the electrode after attaching the electrode.
The method of claim 13, wherein the exothermic coating liquid composition is prepared by dispersing 0.1-20% by weight of the conductor in 50-80% by weight of a solvent and then adding 1-40% by weight of the binder to the dispersion.
15. The method of claim 10 or 14, wherein the conductor is carbon nanotube or carbon fiber.
The method of claim 12, wherein the electrode is made of gold (Au), aluminum (Al), copper (Cu), platinum (Pt), rhodium (Rh), platinum-rhodium alloy (Pt-Rh), chromium (Cr) and silver-palladium Ice tray production method consisting of one or more selected from the group consisting of (Ag-Pd).

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