KR101840734B1 - heat pad and system using the same - Google Patents

Abstract

The present invention relates to a carbon nanotube heating pad and a system using the same. Specifically, the present invention is a heat generating pad including a heat generating layer formed from carbon nanotubes, which excellently exerts heat and heat dissipation effects, can significantly reduce power consumption, and further has electromagnetic wave shielding and noise suppressing effects. , Flexural strength, mechanical strength and the like, and can be applied as a heater for various applications, in particular, for heating, hot water tank, etc., and a system using the carbon nanotube heating pad.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a heat pad,

The present invention relates to a heating pad and a system using the same. Specifically, the present invention is an exothermic pad including a heat-generating layer formed from a carbon-based material, which excellently exerts heat and heat dissipation effects, can significantly reduce power consumption, is further improved in electromagnetic wave shielding and noise suppression effects, , Flexibility, mechanical strength, and the like, so that it can be applied to various applications, in particular, as a heater for heating, hot water tank, etc., and a system using the same.

An area heating element applied to a conventional heating pad installed on the floor or wall of a building for heating the indoor space is a surface heating element having a hot water pipe or a hot wire embedded therein, a metal having excellent electrical conductivity and thermal conductivity, A surface heating element to which a patterned electrode is bonded to a heat generating plate formed from a paste, or the like is used.

However, in the case of the surface heating element to which the hot water piping is applied, the heat generated from the circulating hot water circulating in the piping arranged in a certain pattern is low, so the power consumption is large and the manufacturing cost is increased due to the arrangement of the piping for uniform heat dissipation And flexibility, flexibility and the like of the surface heating element can not be realized, so that there is a problem that the application is limited.

Also, in the case of a surface heating element to which a hot wire is applied, there is a problem that the heat generation effect is low due to the heat generated by the resistance of the hot wire applied by the power supply, so that the power consumption is large and the manufacturing cost is increased due to the arrangement of the hot wire for uniform heat radiation. There is a problem in that electromagnetic waves and noise are generated due to the current flowing in the surface heating element, flexibility of the surface heating element is low, flexibility is low, and the application is limited.

In addition, a conventional planar heating element in which a heating plate formed from an electric / thermal conductive paste and a patterned electrode are combined has insufficient heating effect and a problem of electromagnetic waves and noise generation due to the arrangement of patterned electrodes for uniform heat dissipation have.

Accordingly, the heat generating and heat radiation effect is excellent, the power consumption can be largely reduced, the electromagnetic wave shielding and noise suppression effect is further realized, and the heat generating pad, which is excellent in flexibility, flexibility and mechanical strength, And a system using the same are strongly desired.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a heating pad which is excellent in heat generation and heat radiation effect and can greatly reduce power consumption and a system using the same.

It is another object of the present invention to provide a heat-generating pad excellent in suppressing noise under electromagnetic interference and a system using the same.

It is another object of the present invention to provide a heat generating pad having excellent flexibility, flexibility and mechanical strength, and a system using the same.

In order to solve the above-mentioned gauze,

A heat generating layer made of a carbon-based material; A pair of electrodes electrically connected to the heating layer and disposed along a side surface of the heating layer; And a pair of insulating layers stacked on top and bottom of the heating layer, respectively.

Here, the heat generating layer is formed by pressing a carbon-based material including carbon nanotubes.

Further, the carbonaceous material may further include graphene, carbon black, or both.

On the other hand, the at least one insulating layer of the pair of insulating layers is formed from a heat-dissipating polymer composite material to which a thermally conductive additive is added to the polymer resin.

Here, the insulating layer has an isotropic thermal conductivity k of 0.5 to 50 W / m · K, which is defined by Equation (1) below.

[Equation 1]

In the above equation (1)

k _xy is the in-plane thermal conductivity of the insulating layer,

and k _z is the through-plane thermal conductivity of the insulating layer.

The polymer resin may be at least one thermoplastic polymer resin selected from the group consisting of polycarbonate (PC), polyethylene (PE), ethylene ether acrylate (EEA), ethylene vinyl acetate (EVA) and thermoplastic polyurethane Wherein the thermally conductive additive comprises at least one thermally conductive additive selected from the group consisting of carbon nanotubes, graphene nanoplates, and expanded graphite.

The thermally conductive additive may include about 0.1 to 2 parts by weight of the carbon nanotubes, about 2 to 20 parts by weight of the graphene nanoplate, and about 5 to 30 parts by weight of the expanded graphite, based on 100 parts by weight of the thermoplastic polymer resin The heat-generating pad according to any one of claims 1 to 3,

Each of the pair of electrodes may have a length at least partially covering a side surface of the heating layer. One electrode of the pair of electrodes is disposed on the heating layer, and the other electrode is disposed on the heating layer. Is provided in the heat-generating pad.

One end of each of the pair of electrodes protrudes to the outside of the heating layer, one of the electrodes protrudes to one side of the heating layer, and the other electrode protrudes to the other side of the heating layer. , And a heating pad.

The heating pad has a thickness of 0.1 to 10 mm, and the insulating layer has a thickness of 50 to 3 cm.

The heat generating structure may include a heating structure having a plurality of heating pads coupled thereto, a hot water tank for heating the heated water heated by the heating pad, a power supply for supplying power to the heating structure and the heating pad applied to the hot water tank, And a temperature control device for measuring and controlling the temperature of the heating structure and the hot water tank.

Here, a heating and hot water supply system is provided, further comprising an energy storage device for storing and storing electrical energy.

The heat generating pad according to the present invention has a heat generating layer formed from a carbon-based material and a heat dissipating layer disposed at the upper and lower portions thereof to realize a specific heat dissipating effect, thereby excelling in heat generation and heat dissipation, .

In addition, the heating pad according to the present invention has an excellent effect of minimizing the generation of electromagnetic waves and noise by controlling the shape and arrangement of the electrodes.

Further, the heat-generating pad according to the present invention has various applications in which flexibility, flexibility and mechanical strength can be improved by controlling the material and thickness of the heating layer and the heat-releasing layer, .

1 schematically shows a structure of a heat generating pad according to the present invention.
FIG. 2 is a schematic view of a heat generating structure in which a plurality of heat generating pads according to the present invention are coupled to each other.
FIG. 3 is a graph illustrating a heating effect and a heat radiation effect of a heating pad according to an embodiment of the present invention.
Figure 4 is a photograph of a thermal imaging camera for a heating pad according to the present invention in an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail. However, the present invention is not limited to the embodiments described herein but may be embodied in other forms. Rather, the embodiments disclosed herein are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the invention to those skilled in the art. Like reference numerals designate like elements throughout the specification.

1 schematically shows a structure of a heat generating pad according to the present invention.

1, a heating pad 100 according to the present invention includes a heating layer 10 made of a carbon-based material such as carbon nanotubes, a heating layer 10 electrically connected to the heating layer 10, A pair of electrodes 20a and 20b disposed along the side surface of the heat generating layer 10 and a pair of insulating layers 30a and 30b stacked on the upper and lower surfaces of the heating layer 10,

The carbon nanotube (CNT), which can be used as a carbon-based material for forming the heating layer 10, is a fine molecule having carbon nanotubes connected in a hexagonal ring and having a long tube shape and a diameter of nanometer size Layer carbon nanotube (MWCNT), a single layer carbon nanotube (SWCNT), a double layer carbon nanotube (DWCNT), etc. The carbon-based material may be selected from the group consisting of graphene graphene, carbon black, and the like.

The heating layer 10 is formed not by the heating paste dispersed in the polymeric resin but by the thermal compression of the carbon-based material itself, so that the heat generating layer 10 is formed in the polymer resin in the heating layer formed from the conventional heating paste Of the carbon-based material of the carbon-based material does not occur, so that the heat-generating effect, particularly the rapid and uniform heating effect, is excellent and the power consumption can be reduced by 30% or more. The thickness of the heating layer 10 may be about 0.1 to 10 mm.

The upper or lower portion of the heating layer 10 is provided with a pair of electrodes disposed along each of the opposing side surfaces of the heating layer 10 and having a length at least partially, 20a, and 20b may be disposed to be electrically connected to the heating layer 10. When voltages of different polarities are applied to the pair of electrodes 20a and 20b, a current flows through the heating layer 10 disposed between the pair of electrodes 20a and 20b to generate heat.

The electrodes 20a and 20b may be formed of a material having excellent electrical conductivity such as silver (Ag), copper (Cu), and aluminum (Al). A DC voltage of 12V or 24V It is possible to retain an appropriate electric conductivity and thickness in consideration of the applied voltage.

In the present invention, since the heating layer 10 is formed by pressing the carbon-based material itself unlike the conventional heating paste, the conventional patterned layer 10 covering the heating layer 10 for uniform heat- It is possible to realize a uniform and even heat generation of the heating layer 10 by means of electrodes arranged in a line along each of opposite side surfaces of the heating layer 10, Can be saved.

Further, by adopting the electrodes 20a and 20b arranged in a line along each of the opposite sides of the heating layer 10 in the heating pad according to the present invention, the generation of electromagnetic waves and noise by the conventional patterned electrodes is suppressed Or even minimized electromagnetic waves can be absorbed by the carbon-based material forming the heating layer 10 to suppress the external emission of electromagnetic waves.

Further, the heating pad 100 according to the present invention can be formed by adopting the electrodes 20a and 20b arranged in a line along both opposite sides of the heating layer 10 in place of the conventional patterned electrode, It is possible to reduce manufacturing costs and also to prevent the flexibility and flexibility of the heating pad from being deteriorated due to the patterned electrode.

One of the electrodes 20a is disposed on the heating layer 10 to uniformly generate heat in the heating layer 10 in the thickness direction of the electrodes 20a and 20b, 20 may be disposed below the heat generating layer 10. The heat generating layer 10 may be formed of a material having a high thermal conductivity.

FIG. 2 is a schematic view of a heat generating structure in which a plurality of heat generating pads according to the present invention are coupled to each other.

1 and 2, in the heating pad 100 according to the present invention, each of the electrodes 20a and 20b may have one end protruded to the outside of the heating layer 10, 20 may protrude to one side of the heating layer 10 and the other may protrude to the other side of the heating layer 10 so that the electrodes 20 of the one heating pad 100 20a and 20b are inserted into upper or lower portions of adjacent adjacent heating pad 100 electrodes so that the heating pad 100 can be coupled to another adjacent heating pad 100 and these electrodes can be electrically connected to each other And a plurality of heat generating pads 100 may be combined to form a heat generating structure that covers the entire bottom surface or the wall surface of the building.

The insulating layers 30a and 30b stacked on the upper and lower portions of the heating layer 10 function to prevent the current flowing in the heating layer 10 from leaking to the outside and may be formed of polycarbonate (PC), polyethylene (PE), ethylene ether acrylate (EEA), ethylene vinyl acetate (EVA), and thermoplastic polyurethane (TPU). Specifically, when the direct current voltage of 24 V is applied to the insulating layers 30a and 30b, the current may not flow below -0.01 mA, and the thickness may be about 50 μm to 3 cm.

At least one insulating layer of the pair of insulating layers 30a and 30b may be formed of a thermally conductive additive such as carbon nanotube (CNT), graphene nanoplate (GNP), expanded graphite (EG) Polymer composite material, and as a result, the function as a heat-radiating layer having an excellent heat-radiating effect can be further performed. The thermally conductive additive is uniformly dispersed in the polymer resin, thereby forming an optimum horizontal and vertical heat transfer path in the polymer resin, thereby realizing heat dissipation.

The insulating layers 30a and 30b functioning as the heat dissipation layer may have an isotropic thermal conductivity k defined by Equation 1 below of about 0.5 to 50 W / m · K. When the isotropic thermal conductivity k is less than 0.5 W / m · K, sufficient heat dissipation can not be achieved. On the other hand, when the isotropic thermal conductivity k is more than 50 W / m · K, the thermally conductive additive must be added in an excessive amount. The moldability may be greatly reduced.

In the above equation (1)

k _xy is the in-plane thermal conductivity of the insulating layer,

and k _z is the through-plane thermal conductivity of the insulating layer.

More specifically, the horizontal thermal conductivity (k _xy ) of the insulating layers 30a and 30b functioning as the heat dissipation layer is about 1.5 W / m · K and the vertical thermal conductivity k _z is about 0.4 W / m · K, so that it is possible to perform the optimal heat dissipation function by appropriately adjusting the horizontal and vertical thermal conductivity, unlike the conventional heat dissipation material, which performs only the heat dissipation function depending on the horizontal thermal conductivity.

To this end, the thermally conductive additive preferably comprises about 0.1 to 2 parts by weight of the carbon nanotubes, about 2 to 20 parts by weight of the graphene nanoplate, and about 5 to 30 parts by weight of the expanded graphite, based on 100 parts by weight of the thermoplastic polymer resin Section.

When the content of the carbon nanotubes, the graphene nanoplate, and the expanded graphite constituting the thermally conductive additive is less than the respective numerical values, sufficient heat dissipation can not be achieved. On the other hand, when the content of the carbon nanotubes, Not only the film formability is significantly lowered, but also the viscosity of the composite material is increased, so that the solvent resistance and the coating film adhesion are lowered and the stability is lowered, and the physical properties may be significantly lowered.

The carbon nanotubes may be in the form of a bundle having a diameter of 5 to 15 nm, a length of 5 to 500 μm and an apparent volume of 0.02 g / cm 3 or less, The thickness may be 1 占 퐉 or less, the horizontal length may be 3 to 50 占 퐉, and the expanded graphite may preferably have a horizontal length of 100 占 퐉 or less.

The heat-dissipating polymer composite material is prepared by mixing and dispersing the thermally conductive additive in the thermoplastic polymer resin. If necessary, a dispersant may be further added to improve the dispersibility of the thermally conductive additive to the thermoplastic polymer resin can do.

The dispersant further improves the dispersibility of the thermally conductive additive in the thermoplastic polymer resin so that it can realize excellent thermal conductivity and heat dissipation by a small amount of the thermally conductive additive and further enables the production time of the heat- Can be shortened.

The polymer composite material may include about 0.2 to 5 parts by weight of the dispersant based on 100 parts by weight of the thermoplastic polymer resin. If the content of the dispersant is less than 0.2 parts by weight, the desired dispersibility of the thermally conductive additive can not be realized. On the other hand, if the content of the dispersant is more than 5 parts by weight,

The dispersant is not particularly limited as long as it can improve the dispersibility of the thermally conductive additive to the thermoplastic polymer resin. For example, the dispersant may be a saturated, unsaturated or aromatic hydrocarbon compound having a carbon number of 10 or more, As a liquid compound having 10 to 10,000 cP, a dispersant such as polyvinyl pyrrolidone, cetyltrimethyl ammonium bromide and the like may be used.

The heat generating pad 100 according to the present invention may further include an adhesive layer (not shown) between the heat generating layer 10 and the insulating layer 30 to realize a more stable laminated structure, An additional protective layer (not shown) may be laminated on the outer side of the heat generating pad 30 to protect the heat generating pad 100 from external impact or pressure.

The present invention relates to a system in which the above-described heating pad (100) is used. Specifically, the present invention relates to a heating and / or hot water supply system in which the above-described heating pad 100 is used.

Specifically, the heating and / or hot water supply system according to the present invention includes a heating structure having a plurality of heating pads 100 coupled thereto, a hot water tank for heating hot water heated by the heating pad 100, A power supply for supplying power to the heat generating structure and / or the heating pad 100 applied to the hot water tank, a temperature control device for measuring and controlling the temperature of the heating structure and / or the hot water tank, And the like.

Particularly, the hot water tank can raise the temperature of the water inside the tank by applying power to the heating pad 100 provided on the outside or inside of the tank to generate heat, and also to the outside of the pipe for supplying water to the hot water tank By arranging the heating pad 100, it is possible to preheat the water supplied to the hot water tank. Such a preheating method can solve the problem that the temperature of the water in the hot water tank is prevented from suddenly lowering due to an abrupt increase in the amount of hot water used and the delay of the temperature rise of the heat generating pad 100 is delayed.

The temperature control device may further include a sensor unit for measuring a temperature of water in the heating structure and / or the hot water tank, a display unit for displaying a temperature measured by the sensor unit, a heating unit applied to the heating structure and / A power controller for controlling the power applied to the pad 100, and the like. In addition, the energy storage device stores electrical energy supplied at an inexpensive time, and can utilize electrical energy efficiently when necessary.

[Example]

As shown in FIG. 1, a pair of copper (Cu) electrodes were applied to a heat generating layer having a thickness of about 0.1 mm through thermocompression of carbon nanotubes, a DC voltage of 12 V was applied through the electrodes, The temperature of the heating layer was measured.

In addition, a DC bipolar plate of 12 V was applied through a pair of copper (Cu) electrodes in a heat-radiating pad having a heat-dissipating function and a thickness of about 500 탆 applied to upper and lower portions of the heating layer, The temperature of the insulating layer (heat-radiating layer) was measured. Specifically, the insulating layer (heat-radiating layer) was formed from a polymer composite material in which 1 part by weight of carbon nanotubes, 10 parts by weight of graphene nanoflakes and 8 parts by weight of expanded graphite were added to ethylene vinyl acetate (EVA).

The temperature measurements were taken with an infrared camera and the results are as shown in Table 1 and Figure 3 below. 4A is a photograph of the thermal imaging camera of the heating layer after 1 minute and 30 seconds from the voltage application, and FIG. 4B is a photograph of the thermal imaging camera of the insulating layer (heat radiation layer) four minutes after the voltage application.

0 minutes 2 minutes 4 minutes 6 minutes 8 minutes 10 minutes Heating layer 23 ℃ 86 ℃ 120 DEG C 138 DEG C 139.5 ° C 139.8 ° C Insulating layer
(Heat-radiating layer) 23 ℃ 78 ℃ 101 ° C 119 ℃ 135 ℃ 137 ℃

As shown in Table 1 and FIGS. 3 and 4, the heating pad according to the present invention has an excellent quick and uniform heating effect, and the temperature difference between the heating layer and the insulating layer (heat radiation layer) It was confirmed that the heat radiation effect was also excellent.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention as defined in the following claims. . It is therefore to be understood that the modified embodiments are included in the technical scope of the present invention if they basically include elements of the claims of the present invention.

10: heating layer 20: electrode
30: Insulation layer

Claims (12)

A heat generating layer made of a carbon-based material;
A pair of electrodes electrically connected to the heating layer and disposed along a side surface of the heating layer;
And a pair of insulating layers stacked on top and bottom of the heating layer,
Wherein at least one of the pair of insulating layers is formed from a heat-dissipating polymer composite material to which a thermally conductive additive is added to the polymer resin,
Wherein the insulating layer has an isotropic thermal conductivity k of 0.5 to 50 W / m · K, which is defined by Equation (1) below.
[Equation 1]

In the above equation (1)
k _xy is the in-plane thermal conductivity of the insulating layer,
and k _z is the through-plane thermal conductivity of the insulating layer. The method according to claim 1,
Wherein the heating layer is formed by pressing a carbon-based material including carbon nanotubes. 3. The method of claim 2,
Characterized in that the carbonaceous material further comprises graphene, carbon black or both. delete delete The method according to claim 1,
The polymeric resin includes at least one thermoplastic polymer resin selected from the group consisting of polycarbonate (PC), polyethylene (PE), ethylene ether acrylate (EEA), ethylene vinyl acetate (EVA) and thermoplastic polyurethane and,
Wherein the thermally conductive additive comprises at least one thermally conductive additive selected from the group consisting of carbon nanotubes, graphene nanoplates, and expanded graphite. The method according to claim 6,
Wherein the thermally conductive additive comprises 0.1 to 2 parts by weight of the carbon nanotubes, 2 to 20 parts by weight of the graphene nanoflakes and 5 to 30 parts by weight of the expanded graphite based on 100 parts by weight of the thermoplastic polymer resin Heat pad. 4. The method according to any one of claims 1 to 3,
Wherein each of the pair of electrodes has a length at least partially covering the length of the side surface of the heating layer, one electrode of the pair of electrodes is disposed on the heating layer, and the other electrode is disposed below the heating layer Wherein the heating pad is made of a thermoplastic resin. 4. The method according to any one of claims 1 to 3,
Wherein one end of the electrode protrudes to one side of the heating layer and the other electrode protrudes to the other side of the heating layer. pad. 4. The method according to any one of claims 1 to 3,
Wherein the heat generating layer has a thickness of 0.1 to 10 mm and the insulating layer has a thickness of 50 to 3 cm. A heat generating structure comprising a plurality of heat generating pads coupled to one another according to any one of claims 1 to 3, a hot water tank for heating hot water heated by the heat generating pads, a heating tank for applying heat to the heating structure, And a temperature control device for measuring and controlling the temperature of the heating structure and the hot water tank. 12. The method of claim 11,
Further comprising an energy storage device for storing and storing electric energy.

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