KR101175764B1 - Coating method - Google Patents

Abstract

The present invention relates to a method for coating a backsheet on a heat dissipation sheet, the present invention can increase the thermal conductivity by increasing the adhesion between the heat dissipation sheet and the backsheet, the components of the coating layer coated between the heat dissipation sheet and the backsheet is back By using the polycarbazole component that adheres well to the sheet, the gap of the heat dissipation sheet can be filled, thereby improving the vertical thermal conductivity and reducing the manufacturing cost.
Preparing a heat dissipation sheet, laminating a coating layer on a back sheet, winding the heat dissipation sheet on a tension roller, winding a back sheet on which the coating layer is laminated on the first film roller, and the tension Rewinding the heat dissipation sheet supplied to the roller to a compression roller pair consisting of a first hot roller and a compression roller, and a back sheet on which the coating layer wound on the first film roller is laminated is rewinded to one surface of the heat dissipation sheet. It is characterized in that it comprises a step of coating the back sheet on the heat dissipation sheet during the pressing process in the compression roller while the back sheet is heated in the first hot roller while being supplied.

Description

How to coat the backsheet on the heat dissipation sheet {COATING METHOD}

The present invention relates to a method for coating a backsheet on a heat dissipation sheet, the present invention can increase the thermal conductivity by increasing the adhesion between the heat dissipation sheet and the backsheet, the components of the coating layer coated between the heat dissipation sheet and the backsheet is back By using the polycarbazole component that adheres well to the sheet, the gap of the heat dissipation sheet can be filled, thereby improving the vertical thermal conductivity and reducing the manufacturing cost.

The present invention comprises the steps of preparing a heat dissipation sheet; Laminating the coating layer to the backsheet; Winding the heat dissipation sheet on the tension roller; Winding the back sheet on which the coating layer is laminated on the first film roller; Rewinding the heat dissipation sheet supplied to the tension roller and supplying it to a compression roller pair including a first hot roller and a compression roller; The back sheet coated with the coating layer wound on the first film roller is rewinded and supplied to one surface of the heat dissipation sheet while the back sheet is heated in the first hot roller while being coated in the compression process in the compression roller. do.

The heat dissipation sheet manufactured by the manufacturing method of the present invention uses an expanded graphite sheet, and the heat dissipation sheet is mounted on the lower surface of the device that generates heat in the electronic device, and is used as an electric heat dissipator for preventing abnormalities of the electronic product by dissipating heat. It is common to be. However, the heat dissipation sheet manufactured by the manufacturing method of the present invention is not necessarily limited to this, but to reinforce the function of the solar cell by preventing the overheating of the solar cell in the photovoltaic module that has recently emerged as part of the green policy. It can also be used as a heat dissipation sheet for.

In the modern society, as electronic products develop, malfunctions of various electronic products become letters due to heat generated from heat generating devices, and introduction of a heat dissipation sheet for dissipating heat generated from the electronic devices is essential.

In addition, as the various display devices become slimmer, there is a need to make the thickness of the heat dissipation sheet thinner, and an appropriate graphite heat dissipation sheet is used.

In the case of the expanded graphite sheet, the graphite sheet is in the form of a plate, and a plurality of layers of the graphite sheet are generally overlapped, and in the case of the graphite sheet, a plurality of layers are vertically stacked so that gaps and expansions occur during vertical stacking. There is a problem that the thermal conductivity is not efficient due to the surface voids of the graphite sheet, a means for increasing the vertical thermal conductivity is required.

In addition, as described above, interest in solar power modules is increasing as a means of green policy, and ceramic coating heat dissipation sheets are used to dissipate heat generated from solar cells.

As a patent, a solar power module using a Korean Patent No. 10-0962642 ceramic coating heat dissipation sheet has been registered, and the patent indicates that the solar power module is a glass substrate, a front solar EVA, a solar cell, a rear solar EVA, a back. It is a structure laminated in the order of the backsheet, and a structure in which a heat dissipation sheet having a ceramic coating layer is attached to the exterior of the solar cell by using a double-sided adhesive tape or an adhesive having heat resistance and thermal conductivity on the exterior of the backsheet. The generated heat is transferred back to the EVA and the back sheet, which is transferred to the heat dissipation sheet, which is a carrier, and heat is transmitted to the ceramic coating layer to be radiated. The heat dissipation sheet is made of aluminum, copper, brass, steel, stainless steel, and the like. Select one of the metals having emissivity performance equal to or greater than

The ceramic coating layer is formed on one or both sides of the heat dissipation sheet, the ceramic coating layer is a metal ceramic material such as alumina, titanium oxide, zirconia, metal oxide and non-metal ceramic such as organosilane, inorganic silane, silane coupling agent, CNT It is a configuration characterized by selecting and using one or more materials.

However, in the case of the patent, when the metal sheet is used as a heat dissipation sheet, even though the EVA and the metal sheet are not easily adhered to each other, the metal sheet is repeatedly expanded and contracted due to the seasonal temperature difference. Air gaps occur between the metal sheets, causing the EVA and the metal sheets to be peeled off. When moisture enters the metal sheets, the metal sheets are rusted and corroded. Due to the problem of lowering the amount and the specific gravity of the metal sheet, there is a problem in that the weight of the photovoltaic module is heavy, and the module value is expensive.

As such, the current module for photovoltaic generation is made of materials having high moisture resistance, and therefore, there is an urgent need for introducing a heat dissipation sheet having excellent moisture resistance and heat transfer characteristics.

As described above, the introduction of the manufacturing method of the heat dissipation sheet that can improve the heat dissipation function of the heat dissipation sheet for dissipating heat generated from the electronic device and the cell for photovoltaic power generation, such as the electric heat dissipator and the photovoltaic module. It is a required situation.

A first object of the present invention is to provide a method for coating a back sheet on a heat dissipation sheet capable of increasing the adhesion between the heat dissipation sheet and the back sheet and increasing the thermal conductivity.

The second object of the present invention is that the components of the coating layer coated between the heat dissipating sheet and the back sheet can fill the pores of the heat dissipating sheet by using a polyazole component which is well adhered to the back sheet, thereby improving the vertical thermal conductivity as well as manufacturing. It is to provide a method of coating the back sheet on the heat dissipation sheet that can reduce the cost.

The present invention is to achieve the above object,

Preparing a heat dissipation sheet; Laminating the coating layer to the backsheet; Winding the heat dissipation sheet on the tension roller; Winding a back sheet having a coating layer laminated on the first film roller; Rewinding the heat dissipation sheet supplied to the tension roller and supplying it to a pair of compression rollers including a first hot roller and a compression roller; Rewinding the back sheet coated with the coating layer wound on the first film roller is supplied to one surface of the heat dissipation sheet while the back sheet is heated on the first hot roller, and the back sheet is coated on the heat dissipation sheet during the compression process in the compression roller. It is made to include technical features.

In another aspect, the present invention is a process for further coating the back sheet coated with a coating layer on the other surface of the heat dissipation sheet through the first film roller and the first hot roller, the coating layer is laminated on the other surface of the heat dissipation sheet. silver,

Winding a back sheet on which a coating layer is laminated on the second film roller; Supplying a hot roller pair consisting of a first hot roller and a second hot roller while rewinding the heat dissipation sheet coated with the back sheet on one surface thereof; As the back sheet coated with the coating layer wound on the second film roller is rewinded, the back sheet is supplied to the other surface of the heat dissipating sheet coated with the back sheet, and the back sheet is heated in the second hot roller, and one surface is pressed during the pressing process in the hot roller pair. It is characterized in that it comprises a step of coating the backsheet coated with the coating layer on the other surface of the heat dissipation sheet coated with the backsheet coated on the coating layer.

In addition, the coating layer component of the present invention,

70 parts by weight of the primary solution as a dispersant was mixed with 30 parts by weight of a secondary solution as a binder solvent to form a tertiary solution as a mixed solution, and carbon nanotubes, carbon nanofibers, nano After mixing and dispersing 3 to 20 parts by weight of one or more selected from carbon, graphene, and fullerene to form a mixed dispersion solution as a fourth solution,

It is characterized by passing through the process of mixing 1-10 parts by weight of the dispersed mixed dispersion solution and 90-99 parts by weight of EVA or EAA resin.

In addition, the coating layer of the present invention is characterized in that the EVA or EAA.

In addition, the heat dissipation sheet of the present invention is characterized in that the expanded graphite sheet.

According to the present invention,

First, it has a clear advantage in thermal conductivity because it can increase the adhesion between the polycarbide-coated heat dissipation sheet, that is, the expanded graphite sheet and the back sheet,

Second, by filling the surface pores of the heat dissipation sheet, that is, the expanded graphite sheet by using a poly sol, it is possible to reduce the manufacturing cost by 15% due to the self-developed poly sol and a film which is easy to coat the poly sol. have.

1 is a diagram illustrating a process of coating a back sheet on one surface of a heat radiation sheet.
2 is a view showing a process of coating the back sheet on both sides of the heat radiation sheet.
3 is a cross-sectional view of the heat dissipation sheet for electric wire manufactured by FIG.
4 is a cross-sectional view showing a heat dissipation sheet of the solar cell module manufactured by FIG. 1 or 2.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings 1 to 4 as follows.

As the present invention is shown in Figure 1,

Preparing a heat dissipation sheet 10, laminating a coating layer on the back sheet 30, winding the heat dissipation sheet to the tension roller 600, and the coating layer is laminated on the first film roller 300 Winding the backsheet 30 and supplying it to the compression roller pair including the first hot roller 100 and the compression roller 200 while rewinding the heat dissipation sheet supplied to the tension roller 600; , And

As the back sheet 30 on which the coating layer wound on the first film roller 300 is laminated is supplied to one surface of the heat dissipation sheet while being rewinded, the back sheet 30 is heated in the first hot roller 100 while the compression roller 200 Including the step of coating the back sheet 30 on the heat dissipation sheet 10 during the pressing process in),

As shown in Figure 2, the first film roller 300 and the first hot roller 100, the coating layer is laminated on the other surface of the heat dissipation sheet through the first hot roller 100, but further adding a process of coating,

The process of coating the back sheet 30, the coating layer is laminated on the other surface of the heat dissipation sheet,

Winding the back sheet 30 having the coating layer laminated on the second film roller 320, while rewinding the heat dissipation sheet coated with the back sheet on one surface, the first hot roller 100 and the second hot roller 120 Supplying to the hot roller pair consisting of a), the back sheet 30 is laminated with the coating layer wound on the second film roller 320 is rewinding and supplied to the other surface of the heat-sink sheet coated with the back sheet on one surface It is characterized in that it comprises a step of coating the back sheet coated with the coating layer on the other surface of the heat dissipation sheet coated with the back sheet coated with the coating layer on one surface during the pressing process in the hot roller pair is heated in the second hot roller.

Example  One

First, as an embodiment of the present invention will be described a method for manufacturing the electric heat sink (C1).

In FIG. 1, the expanded graphite sheet, i.e., the coating on only one surface of the heat dissipation sheet 10 is illustrated, but when one pair of compression rollers is provided, the expanded graphite sheet may be coated on both sides, and the second hot roller may be further added as shown in FIG. The back sheet and the heat dissipation sheet may be coated between the first hot roller and the second hot roller, and the description of FIG. 2 will be described later.

Preferably, the heat dissipation sheet 10 is an expanded graphite sheet, and the expanded graphite sheet is in a state of overlapping a plurality of plate-like graphite sheets, but the horizontal thermal conductivity is a good advantage, but there is a problem of low vertical thermal conductivity.

In order to improve the vertical thermal conductivity, as shown in FIG. 3, it is preferable to coat the polycarsol 20 for improving the vertical thermal conductivity on the upper surface of the expanded graphite sheet 10. The configuration and coating will be described later.

Referring back to the process with reference to Figures 1 and 3,

After laminating the polycarsol 20 coating layer on the back sheet 30 of the upper or lower surface, and winding it on the first film roller 300,

After preparing the expanded graphite sheet 10 and winding it on the tension roller 600, the back sheet 30 wound on the first film roller 300 and the expanded graphite sheet 10 wound on the tension roller While rewinding, it is supplied to a pair of compression rollers including the first hot roller 100 and the compression roller 200.

 The backsheet 30 coated with the polyazole 20 is laminated on the expanded graphite sheet 10 while being supplied to a compression roller pair consisting of the first hot roller 100 and the compression roller 200.

In particular, in the case of laminating with the expanded graphite sheet 10 while pre-heating the backsheet 30 on which the polycasol 20 coating layer is laminated with the first hot roller 100 as shown in FIG. Since the adhesion between the sol 20 and the backsheet 30 can be increased, the thermal conductivity is improved, and the manufacturing cost can be reduced compared to the process of bonding the previous backsheet with an acrylic adhesive.

The backsheet 30 is preferably PET (polyethylene terephthalate] or OPP (oriented polyoropulene), but the backsheet is not limited to PET or OPP, and other films having the same or similar physical properties. It is possible to use

The compression roller 200 is preferably used that the urethane is coated on the surface, and the brush 400 for cleaning the surface of the compression roller at a predetermined position (that is, the vicinity of the compression roller) of the compression roller 200 is It is preferred to be mounted.

The film manufactured as described above is wound around the winding roll 500 and stored therein, and then, after being coated with an acrylic adhesive 40 on one surface in order to be used as a heat radiator for electrical equipment, the liner 42 is adhered thereto. Use it after.

Also as shown in Figure 2,

The process of coating the backsheet 30 on the other surface of the expanded graphite sheet 10 through the first film roller 300 and the first hot roller 100 is illustrated, and the expanded graphite coated with the backsheet on one surface thereof. In the process of further coating the back sheet 30 on the other surface of the sheet, after winding the back sheet 30 on which the polycarsol 20 coating layer is laminated on the second film roller 320, and the back sheet 30 on one side thereof. After rewinding the expanded graphite sheet 10 coated with

Supplying the back sheet and the expanded graphite sheet 10 coated with the back sheet 30 on one surface to a hot roller pair consisting of a first hot roller 100 and a second hot roller 120,

As the back sheet 30 wound on the second film roller 120 is rewinded, the back sheet 30 is supplied to the other surface of the expanded graphite sheet 10 coated with the back sheet on one surface of the back sheet 30. While the second hot roller 120 is heated while being coated during the pressing process in the hot roller pair it is possible to coat both sides of the expanded graphite sheet (10).

Hereinafter, the configuration for the polycarbole 20 which is a coating layer used in the present invention will be described in detail.

Water or ethyl alcohol, methyl alcohol, isopropyl alcohol, acetone, methyl ethyl ketone, ethyl isoketone, ethylene glycol, aniline, toluene, chloroform sodium dodecyl sulphate, polyvinyl alcohol, triton-x, hydropropyl Using a solution of one or two or more selected from cellulose, hydroxypropyl methyl cellulose to make a ratio of the primary solution,

As a binder solvent, a urethane-based solution in which polyester and urethane are mixed at a predetermined ratio, or a silane (adhesive enhancer) and an epoxy-based mixture are mixed at a predetermined ratio to make a secondary solution,

After mixing the primary solution and the secondary solution in a predetermined ratio to form a tertiary solution,

Single wall carbon nanotubes, double wall carbon nanotubes, multiwall carbon nanotubes, carbon nanofibers, nanocarbons, graphene, and fullerenes in a tertiary solution are mixed in a predetermined ratio. After making tea (final) solution,

The fourth (final) mixed solution is placed in a beaker or dispersion container, and then dispersed through an ultrasonic apparatus to prepare a polydissol solution as a mixed dispersion solution.

In another way,

70 parts by weight of the primary solution as a dispersant was mixed with 30 parts by weight of a secondary solution as a binder solvent to form a tertiary solution as a mixed solution, and carbon nanotubes, carbon nanofibers, nano After mixing and dispersing 3 to 20 parts by weight of one or more selected from carbon, graphene, and fullerene to form a mixed dispersion solution as a fourth solution,

1-10 parts by weight of the dispersed mixed dispersion solution and 90-99 parts by weight of EVA or EAA resin are mixed to prepare a polysol solution.

Of course, like the polycarsol solution described above,

The dispersing agent is water or ethyl alcohol, methyl alcohol, isopropyl alcohol, acetone, methyl ethyl ketone, ethyl isoketone, ethylene glycol, aniline, toluene, chloroform sodium dodecyl sulfate, polyvinyl alcohol, triton-x, hydro Using one or two or more solutions selected from propyl cellulose, hydroxypropyl methylcellulose,

The binder solvent is completed by mixing a urethane-based solution in which polyester and urethane are mixed at a constant ratio, or a silane (adhesive enhancer) and an epoxy at a constant ratio.

Experimental Example  One

Comparative Example 1

An acrylic adhesive is applied to the upper and lower surfaces of the expanded graphite sheet, a PET film is attached to the acrylic adhesive, an acrylic adhesive is applied to one surface of the PET film, and a liner is provided on the lower surface of the acrylic adhesive. The physical radiators of Example 1 were compared.

As a result of comparing Comparative Example 1 and Example 1 of the present invention, Example 1 can fill the surface voids of the expanded graphite sheet by using a polysol, and can increase the adhesion with the backsheet, thus having a clear advantage in thermal conductivity. In addition, it is possible to reduce manufacturing costs by 15% with a polycarsol and a film easily coated on the polycarsol.

Example  2

Hereinafter, an embodiment of the present invention will be described by applying to the solar heat sink (C2) used in the module for solar power generation.

The heat dissipator C2 used for the solar power module includes an expanded graphite sheet 10, an EVA 50 laminated on both sides of the expanded graphite sheet, and a back sheet 70 and 80 laminated on the upper and lower surfaces. The backsheet 70 is formed on one surface of the bottom sheet when the inorganic coating layer 90 is coated.

The heat dissipation sheet used in the solar module as described above is laminated on the back film 30, the EVA film 50 on the bottom 10, and then supply the back sheet 30 to the compression roller pair and the hot roller pair It is the same as the manufacturing process of FIGS. 1 and 2 shown in Example 1, except that.

It is preferable to use PET or OPP as the back sheet.

In the exemplary embodiment of the present invention, the material for the heat dissipation sheet is mainly limited to the expanded graphite sheet, but the material for the heat dissipation sheet is not necessarily limited thereto.

It will be appreciated by those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. Therefore, the above-described embodiments are to be understood as illustrative in all respects and not restrictive.

The scope of the invention is indicated by the following claims rather than the above description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the invention. do.

C1: Electric Heat Sink
10: expanded graphite sheet 20: polycarsol
30: backsheet 40: acrylic adhesive
42: liner
C2: Solar Radiator
50: EVA 60: aluminum laminate
70, 80: back sheet 90: inorganic coating coating layer
100: first hot roller 120: second hot roller
200: compression roller 300: first film roller
320: second film roller 400: brush
500: winding roll 600: tension roller

Claims (5)

Preparing a heat dissipation sheet;
Laminating the coating layer to the backsheet;
Winding the heat dissipation sheet on the tension roller;
Winding the back sheet on which the coating layer is laminated on the first film roller;
Rewinding the heat dissipation sheet supplied to the tension roller and supplying it to a pair of compression rollers including a first hot roller and a compression roller;
The back sheet coated with the coating layer wound on the first film roller is rewinded and supplied to one surface of the heat dissipation sheet, and the back sheet is heated through the first hot roller, and then radiated during the pressing process through the first hot roller and the compression roller. It comprises a step of coating the sheet back sheet,
The coating layer is
70 parts by weight of the primary solution as a dispersant was mixed with 30 parts by weight of a secondary solution as a binder solvent to form a tertiary solution as a mixed solution, and carbon nanotubes, carbon nanofibers, nano After mixing and dispersing 3 to 20 parts by weight of one or more selected from carbon, graphene, and fullerene to form a mixed dispersion solution as a fourth solution,
To be completed through the process of mixing 1-10 parts by weight of the dispersed mixed dispersion solution and 90-99 parts by weight of EVA or EAA resin,
The dispersant is water, ethyl alcohol, methyl alcohol, isopropyl alcohol, acetone, methyl ethyl ketone, ethyl isoketone, ethylene glycol, aniline, toluene, chloroform sodium dodecyl sulfate, polyvinyl alcohol, triton-x, hydro Using one or two or more solutions selected from propyl cellulose, hydroxypropyl methylcellulose,
The binder solvent is a method for coating a back sheet on a heat dissipation sheet, characterized in that the polyester and urethane or a mixture of silane and epoxy. The method of claim 1,
Further adding a process of coating the back sheet coated with a coating layer on the other surface of the heat dissipation sheet through the first film roller and the first hot roller,
The process of coating the back sheet in which the coating layer is laminated on the other surface of the heat dissipation sheet
Winding a back sheet on which a coating layer is laminated on a second film roller;
Supplying a hot roller pair consisting of a first hot roller and a second hot roller while rewinding the heat dissipation sheet coated with the back sheet on one surface thereof;
As the back sheet coated with the coating layer wound on the second film roller is rewinded, the back sheet is supplied to the other surface of the heat dissipating sheet coated with the back sheet, and the back sheet is heated in the second hot roller, and one surface is pressed during the pressing process in the hot roller pair. A method of coating a backsheet on a heat dissipation sheet, comprising the step of coating the backsheet coated with a coating layer on the other surface of the heat dissipation sheet coated with a backsheet coated with a coating layer. The method of claim 2,
And a brush for cleaning the surface of the compression roller in the vicinity of the compression roller, and the surface of the compression roller is coated with urethane. delete The method of claim 3, wherein
The heat dissipation sheet is a method of coating the back sheet on the heat dissipation sheet, characterized in that the expanded graphite sheet.

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