KR20130117044A - Composition for thermal conducting coating layer and method for fabricating the thermal conducting coating layer - Google Patents

Abstract

PURPOSE: A composition for formation of heat conductive coating layer is provided to have excellent mechanical property, corrosion resistance, and heat conductivity, and to improve the heat transfer characteristic of a heat exchanger. CONSTITUTION: A composition for formation of heat conductive coating layer comprises: the ceramic sol in which ceramic nanoparticles combined with organic functional silane compound are dispersed in water; a cross-linking agent; and the carbon group heat conductive filler. A manufacturing method of the composition for formation of heat conductive coating layer comprises: a step of hydrolyzing the organic functional silane compound under water (S1); and a step of forming an organic-inorganic mixed dispersion through a condensation reaction by adding the aqueous ceramic sol, the cross-linking agent, and the carbon group heat conductive filler to the product of hydrolysis (S2). [Reference numerals] (S1) Hydrolysis step; (S2) Condensation reaction step

Description

Composition for thermal conducting coating layer and method for fabricating the thermal conducting coating layer}

The present invention relates to a composition for forming a thermally conductive coating layer and a method for manufacturing the same, and more particularly to a composition for forming a thermally conductive coating layer excellent in mechanical properties, corrosion resistance and thermal conductivity and a method for producing the same.

In the sol-gel method, a metal alkoxide may be used as a precursor to obtain a composition having high chemical uniformity through several chemical reactions. The composition prepared by the sol-gel method may be coated on the surface of the material by spin coating, dip coating, or the like to impart new functions to the surface of the material that the material did not have. For example, by forming such a coating layer, improvements in the mechanical or chemical properties of the surface of the material can be realized, and therefore, a technique for properly implementing such a coating layer is a very important technique for high value-adding of materials (BD fabes et al., Journal of Non-Crystalline Solids, Volume 121, Issues 1-3, 1 May 1990, Pages 348-356).

An object of the present invention is to provide a composition for forming a thermally conductive coating layer capable of producing a thermally conductive coating layer having a high thermal conductivity on the surface of a material. In another aspect, the present invention is to provide a method for forming a thermally conductive coating layer on the surface of the material using such a composition and to provide a thermal conductor structure in which the thermally conductive coating layer is formed. However, these problems are exemplary and do not limit the scope of the present invention.

According to an aspect of the present invention, a ceramic sol in which ceramic nanoparticles to which an organofunctional silane compound is bonded is dispersed in water; A crosslinking agent; And a carbon-based thermally conductive filler. A composition for forming a thermally conductive coating layer is provided.

In this composition, 1 to 50% by weight of the ceramic nanoparticles, 1 to 50% by weight of the organofunctional silane compound, 0.5 to 10% by weight of the crosslinking agent, 40 to 95% by weight of water, 0.2 to 5% by weight of the carbon-based thermally conductive filler may be included.

At this time, the organofunctional silane compound is 3-glycidoxypropyltrimethoxy silane, 3-glycidoxypropyltriethoxy silane, 3-glycidoxypropyltriethoxy silane, 3-glycidoxypropylmethyldimethoxy 3-glycidoxypropylmethyldimethoxy silane, 3-glycidoxypropylmethyldiethoxy silane, methyltrimethoxy silane, methyltriethoxysilane, methyltriethoxysilane, ethyltrimethoxy silane (ethyltrimethoxy silane), ethyltriethoxy silane (ethyltriethoxy silane), dimethyldimethoxy silane, dimethyldiethoxy silane, vinyltrimethoxy silane, vinyltriethoxy silane (vinyltriethoxy silane) and tetraethoxy orthosilcate may include one or more selected from the group consisting of.

Meanwhile, the crosslinking agent may include one or more selected from the group consisting of phosphates, alkoxides, amino silanes, acids and amides, and specifically, hexamethic acid. It may include one or more selected from the group consisting of sodium hexametaphosphate, citraconic acid, dicyamide, and cyclic siloxane.

In this case, the cyclic siloxane may include polyhedral oligomeric silsesquioxane (POSS).

Meanwhile, the ceramic particles dispersed in the aqueous ceramic sol may include one or more selected from the group consisting of silicon oxide particles, aluminum oxide particles, and titanium oxide particles.

The carbon-based thermally conductive filler may include one or more selected from the group consisting of graphite, carbon black, nano carbon powder, and carbon nanotubes.

In addition, the pH of the composition may have a range of 7 to 8.

According to another aspect of the invention, the step of hydrolyzing the organofunctional silane compound in water; Providing a method for preparing a composition for forming a thermally conductive coating layer comprising a step of forming an organic-inorganic hybrid material dispersion by adding a water-based ceramic sol, a carbon-based thermal conductive filler and a crosslinking agent to a condensation reaction to the result of the hydrolysis. do.

The organofunctional silane compounds include 3-glycidoxypropyltrimethoxy silane, 3-glycidoxypropyltriethoxy silane, 3-glycidoxypropyltriethoxy silane and 3-glycidoxypropylmethyldimethoxy 3-glycidoxypropylmethyldimethoxy silane, 3-glycidoxypropylmethyldiethoxy silane, methyltrimethoxy silane, methyltriethoxysilane, ethyltrimethoxy silane ethyltrimethoxy silane, ethyltriethoxy silane, dimethyldimethoxy silane, dimethyldiethoxy silane, vinyltrimethoxy silane, vinyltriethoxy silane ) And tetraethoxy orthosilcate may include one or more selected from the group consisting of.

The crosslinking agent may include one or more selected from the group consisting of phosphates, alkoxides, amino silanes, acids and amides.

The crosslinking agent may include at least one selected from the group consisting of sodium hexametaphosphate, citraconic acid, dicyamide, and cyclic siloxane. Cyclic siloxane may include polyhedral oligomeric silsesquioxane (POSS).

The ceramic nanoparticles of the aqueous ceramic sol may include one or more selected from the group consisting of silicon oxide particles, aluminum oxide particles, and titanium oxide particles.

The carbon-based thermally conductive filler may include one or more selected from the group consisting of graphite, carbon black, nano carbon powder, and carbon nanotubes.

According to another aspect of the invention, the substrate; And a thermally conductive coating layer formed by applying and crosslinking the above-mentioned composition for forming a thermally conductive coating layer on at least one surface of the substrate.

In this case, the substrate may include a material in which an anodization film is formed on one surface of the composition for forming the thermal conductive coating layer, and the material may include aluminum or magnesium.

According to another aspect of the invention, the substrate is formed with an anodization film on at least one surface; And a thermally conductive coating layer formed on the anodization layer, wherein the thermally conductive coating layer comprises: an organic-inorganic hybrid material produced by condensation and crosslinking between an organic functional silane compound and a ceramic sol; And a carbon-based thermal conductive filler dispersed in the organic-inorganic hybrid material.

The size of the ceramic nanoparticles of the ceramic sol may have a smaller value than the pore size of the anodization film.

According to still another aspect of the present invention, a heat exchanger including the heat conductor structure is provided.

According to the embodiment of the present invention made as described above, it is possible to obtain a sol-gel composition capable of producing an excellent thermal conductive coating layer, it is possible to form a coating layer having a high thermal conductivity on the material surface using such a composition. Such a coating layer may be applied to a heat exchanger to contribute to improving heat transfer characteristics of the heat exchanger. Of course, the scope of the present invention is not limited by these effects.

Figure 1 shows step by step for the preparation of a composition according to an embodiment of the present invention.
2 is a cross-sectional view when a coating layer is formed on the anodization film by using the composition according to an embodiment of the present invention.
3A is a conceptual diagram of galvanic corrosion of aluminum-stainless steel, and FIG. 3B illustrates that galvanic corrosion does not occur when anodization film and a heat conductive coating layer are formed on aluminum. .
4 is a cross-sectional view illustrating a case where an anodization film and a thermal conductive coating layer are formed on a surface of an aluminum material according to an embodiment of the present invention.
5 is a result of testing the corrosion characteristics according to the presence or absence of the thermal conductive coating layer formed according to an embodiment of the present invention.
6 is a result of observing the surface state of the specimen after testing the corrosion characteristics according to the presence or absence of the thermal conductive coating layer formed according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood, however, that the invention is not limited to the disclosed embodiments, but may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, Is provided to fully inform the user. Also, for convenience of explanation, the components may be exaggerated or reduced in size.

The composition for forming a thermally conductive coating layer (hereinafter also referred to as a composition) according to an embodiment of the present invention is a ceramic sol, a crosslinking agent, and a carbon-based thermally conductive filler in which ceramic nanoparticles in which an organofunctional silane compound is bonded are dispersed in water ( filler).

The thermally conductive coating layer-forming composition may be prepared by adding a crosslinking agent, an aqueous ceramic sol and a carbon-based thermal conductive filler to a hydrolysis product prepared by heating a mixture of an organic functional silane compound, an organic acid, and water to cause a condensation reaction. .

1 shows a step by step method for preparing a composition according to an embodiment of the present invention. Referring to Figure 1, the composition according to an embodiment of the present invention is to heat the mixture of the organofunctional silane compound, acid catalyst and water to cause hydrolysis (S1) and the cross-linking agent, the aqueous And adding a ceramic sol and a carbon-based thermally conductive filler to cause a condensation reaction of the mixture (S2).

On the other hand, as the reaction solvent, a mixed solvent in which alcohols such as methanol, ethanol, propanol and butanol are further added in addition to water may be used in some cases.

At this time, the pH of the composition may further improve its stability by having a neutral atmosphere in the range of 7 to 8. The adjustment of the pH can be carried out, for example, by adding ammonia.

The organofunctional silane compound is provided with a hydrolyzable functional group to bind with an inorganic material, 3-glycidoxypropyltrimethoxy silane (3-glycidoxypropyltrimethoxy silane), 3-glycidoxypropyltriethoxy silane (3 3-glycidoxypropyltriethoxy silane, 3-glycidoxypropylmethyldimethoxy silane, 3-glycidoxypropylmethyldiethoxy silane, 3-glycidoxypropylmethyldiethoxy silane, methyltrimethoxy silane, methyl Triethoxysilane, ethyltrimethoxy silane, ethyltriethoxy silane, dimethyldimethoxy silane, dimethyldiethoxy silane, vinyltrimethoxy Composed of vinyltrimethoxy silane, vinyltriethoxy silane and tetraethoxy orthosilcate Which may comprise at least one member selected from the group. The organofunctional silane compound may have a composition range of 1 to 50% by weight, preferably 20 to 40% by weight in the composition. The surface uniformity may be lost below the above range, and mechanical properties such as hardness and wear resistance may be lowered above the above range.

The acid catalyst is a catalyst for promoting hydrolysis, and inorganic acids such as hydrochloric acid, nitric acid, sulfuric acid, formic acid, citric acid, glycylic acid, glycolic acid, nicotinic acid, lemon acid, malic acid, benzoic acid, butyric acid, malic acid, salicylic acid, succinic acid, sulfonic acid, Sulfinic acid, citric acid, acetic acid, acetic salicylic acid, ascorbic acid, ascorbic acid, alpha ketoglutaric acid, oxalic acid, oxal acetic acid, uric acid, free acid, isocitric acid, lactic acid, tartaric acid, carboxylic acid, caffeic acid, kuwen acid, tartaric acid And organic acids such as palmitic acid, phenol, formic acid, grape acid, fumaric acid, succinic acid, itaconic acid, p-toluenesulfonic acid and citraconic acid. At this time, the acid catalyst has a composition range of 0.1 to 2% by weight in the composition, preferably may have a range of 1 to 2% by weight.

A crosslinking agent is a substance that forms a net structure by chemically bonding molecules of linear polymer compounds to each other and is selected from the group consisting of phosphates, alkoxides, amino silanes, acids and amides. It may include one or more kinds.

Specifically, the crosslinking agent may include one or more selected from the group consisting of sodium hexametaphosphate, citraconic acid, dicyanamide, and cyclic siloxane. have. In this case, the cyclic siloxane may be a polyhedral oligmeric silsequioxane (POSS). The POSS may comprise a multifunctional group for crosslinking.

The crosslinking agent may have a composition range of 0.5 to 10% by weight in the composition. Below the composition range, the degree of crosslinking may be lowered, and thus the mechanical properties of the coating layer may be lowered.

The ceramic sol is dispersed in water as a solvent in the ceramic nanoparticles colloidal state, it may be stabilized by an acid or a base. In this case, the ceramic nanoparticles are, for example, at least one selected from the group consisting of silicon oxide (silica, SiO ₂ ) particles, aluminum oxide (alumina, Al ₂ O ₃ ) particles, and titanium oxide (titania, TiO ₂ ) particles. It may include.

In this case, the ceramic nanoparticles may have a diameter of 100 nm or less, preferably 5 to 30 nm, and more preferably 10 to 20 nm. It is possible to form a stable dispersion in the above range. In addition, the diameter of the ceramic nanoparticles may have a smaller value than the size of pores on the anodization film described later. Due to the small particle diameter of the ceramic nanoparticles, the ceramic nanoparticles may be introduced into the pores, thereby strengthening the bond between the coating layer and the anodization layer.

On the other hand the ceramic nanoparticles may have a composition range of 1 to 50% by weight of the total weight of the total composition, preferably 10 to 50% by weight, more preferably 30 to 50% by weight may range. Forming a stable dispersion in the composition range is easy to coat.

The carbon-based thermally conductive filler is a material added into the composition to improve thermal conductivity of the coating layer, and may include one or more selected from the group consisting of graphite, carbon black, nanocarbon powder, and carbon nanotubes. In this case, the carbon nanotubes may have both a single wall and a multi-wall structure, and in some cases, a multi-wall structure may be more preferable.

Such carbon-based thermally conductive filler may have a composition range of 0.2 to 5% by weight in the composition. In the composition range it may be excellent in mechanical properties and thermal conductivity of the final coating layer.

The composition prepared by this method may be for forming a thermally conductive coating layer on at least one side of the substrate. At this time, the method for forming the coating layer may be used a wet method such as dip coating, spin coating and the like.

According to an embodiment of the present invention, a thermal conductor structure including a substrate and a thermally conductive coating layer formed by applying and crosslinking the above-mentioned composition for forming a thermally conductive coating layer on at least one surface of the substrate is provided.

The substrate may be various materials such as metal, ceramic, semiconductor, glass, and plastic. For example, the substrate may be a metal material, and an anodization layer may be formed on one surface of the composition. That is, the coating layer is laminated on the anodization film formed on the surface of the metal material. The metal material may be aluminum or magnesium. Aluminum here includes pure aluminum and aluminum alloys, even in the case of magnesium. When the coating layer is formed on top of the anodization layer, a chemical bond may be formed between the hydroxyl group of the coating layer and the hydroxyl group of the anodization layer, thereby exhibiting excellent adhesion between the coating layer and the anodization layer.

In addition, according to an embodiment of the present invention, there is provided a thermal conductor structure including a substrate having an anodization film formed on at least one surface thereof, and a thermally conductive coating layer formed on the anodization film. Here, the thermally conductive coating layer includes an organic-inorganic hybrid material produced by condensation and crosslinking between the organofunctional silane compound and the ceramic sol, and a carbon-based thermal conductive filler dispersed in the organic-inorganic hybrid material.

The above-described thermal conductor structure is excellent in mechanical properties, corrosion resistance and excellent thermal conductivity due to the organic-inorganic hybrid material and the carbon-based thermal conductive filler. For example, the above-described thermal conductor structure may be applied to a heat exchanger.

FIG. 2 is a cross-sectional view of the case in which the coating layer 220 is formed on the anodization film 210 formed on the surface of the substrate 200.

For example, when the anodization layer 210 is formed on one surface of an aluminum material, a bohemite (AlO (OH)) having a porous network is formed during anodization, and a hydroxyl group (-OH) is formed on the surface thereof. ) Exists. When the coating layer 220 is formed using the composition according to an embodiment of the present invention on the surface on which the hydroxyl group is formed, the hydroxyl group is covalently bonded to the ceramic particles of the aqueous ceramic sol included in the composition.

For example, when the ceramic in the aqueous ceramic sol is silicon oxide, the hydroxyl group is covalently bonded to the silicon oxide to form a Si-O-Al bond on the anodization film 210.

In this case, the coating layer 220 has a very dense coating layer formed on the surface of the anodization layer due to the uniform distribution of ceramic particles in the polymer skeleton composed of the Si-O-Si linkages, and also due to the Si-O-Al bond described above. The coating layer 220 formed on the oxide film 200 exhibits very good adhesion.

In this case, the ceramic nanoparticles may have a smaller size than pores formed in the anodization film 210.

On the other hand, in the composition, a carbon-based material having high thermal conductivity, that is, graphite, carbon black, nano carbon powder, carbon nanotube, and the like are dispersed together with the ceramic particles described above. Therefore, the coating layer 220 formed using such a composition has a structure in which carbon-based material particles are dispersed in a matrix of an organic-inorganic hybrid material, and may exhibit high thermal conductivity at the same time with excellent adhesion.

Therefore, such a composition can be utilized to manufacture a thermal conductor structure having a thermally conductive coating layer in order to realize high thermal conductivity and mechanical stability at the same time. For example, such a heat conductor structure may be applied to a heat exchanger or the like.

Aluminum with high thermal conductivity may be used as a material for heat exchangers. For example, a ship may be equipped with a heat exchanger made of aluminum. As described above, an aluminum heat exchanger used in a seawater environment may cause galvanic corrosion by contact with dissimilar metals. 3 conceptually illustrates the mechanism by which such galvanic corrosion occurs.

Referring to FIG. 3A, when the dissimilar metal is in direct contact with the stainless steel 310, the aluminum 300, which is a heat exchanger material, is not an aluminum 300 that is electrically nonmetallic than the stainless steel 310. It is a node (anode), stainless steel 310 is a cathode (cathode). Therefore, the aluminum 300 and the stainless 310 are exposed to an air (salty air) atmosphere containing various ions supplied from seawater, and a path of current movement as shown by the arrow of FIG. 3A is formed. Therefore, corrosion occurs first in the aluminum 310 which is an anode.

This galvanic corrosion occurs when the electrochemically non-metallic metal is in direct contact with the precious metal and thus the current can be moved. Therefore, the galvanic corrosion is directly between the nonmetal aluminum 300 and the precious metal stainless steel 310. This can be prevented by blocking the contact with an insulator.

Accordingly, as shown in FIG. 3B, an anodic oxide film 320, which is an insulator, is formed on the surface of the aluminum 300 and interposed between the aluminum 300 and the stainless steel 310 to directly contact the aluminum 300 and the stainless steel 310. Can be prevented to prevent galvanic corrosion.

However, in this case, the anodization layer 320 formed on the surface of the aluminum 300 may reduce heat exchange characteristics between the aluminum 300 and the stainless steel 310 as the thermal conductivity decreases as an insulator. Surface modification may be necessary to compensate for the reduction of.

Using the composition prepared according to the embodiment of the present invention as shown in Figure 3c, by forming a thermally conductive coating layer 330 on the anodization film 320 to compensate for the reduction in thermal conductivity by the anodization film 320 to improve the thermal conductivity efficiency Can be improved.

 Hereinafter, in order to help the understanding of the present invention provides an experimental example for the composition preparation method. It should be understood, however, that the following examples are for the purpose of promoting understanding of the present invention and are not intended to limit the scope of the present invention.

[Experimental Example 1]

(a) hydrolysis step

A mixture of 20 g of 3-glycidoxypropyltrimethoxy silane and 10 g of tetraethoxy orthosilcate as an organofunctional silane compound was mixed with 10 g of diluted acetic acid as a hydrolysis catalyst (concentration of 10 wt%). % Aqueous solution) and then 20 g of water was added rapidly with stirring. The hydrolysis was then induced while heating to 85 ° C. with vigorous stirring over 2-3 hours. After the hydrolysis was completed, the mixture was cooled to 50 ° C. and then 15 g of water was further added.

(b) condensation stage

After the hydrolysis was completed, 10.0 g and 35.0 g of BINDZIL 2034 (30 weight% of solid content) in which the silicon oxide was dispersed as a crosslinking agent and POSS (solid content 2% by weight) as an aqueous ceramic sol were added to the result of the hydrolysis. Homogenization treatment was performed for 10 minutes. As a filler to increase the thermal conductivity during the homogenization treatment, 1.0 g (concentration 0.5% by weight) of an aqueous solution in which carbon nanotubes were dispersed was added as an additive to the mixture. After 24 hours of continuous stirring, the condensation reaction was completed.

[Experimental Example 2]

Compared with Experimental Example 1 above, the addition amount of POSS and BINDZIL 2034 was 8.0g and 40.0g, respectively, except that the amount of the aqueous solution in which carbon nanotubes were dispersed was 2.0g.

Through the above Experimental Examples 1 and 2 it was possible to prepare a sol-gel composition having a homogenized dispersed phase.

(evaluation)

4 is a cross-sectional view of the case where the coating layer 330 is formed by using the composition prepared using Experimental Example 1 on the anodization layer 320 having a thickness of about 50 μm formed on the surface of aluminum with a scanning electron microscope. One result is shown. The coating method can be sprayed and dipping, and a perfect coating can be obtained by curing at 130 ° C. Referring to FIG. 4, it can be seen that the coating layer 330 having an average thickness of about 2.6 μm is uniformly coated. Although not shown in the drawings, the composition prepared through Experimental Example 2 showed almost the same results.

In order to observe the change in corrosion characteristics by the thermally conductive coating layer, specimen 1, which is an aluminum with only an anodized film, and specimen 2, which is an aluminum with a thermally conductive coating layer formed using the composition prepared in Experiment 1 on the anodized film (specimen 2) was produced. In order to compare the corrosion characteristics of specimens 1 and 2, a tafel analysis was performed using a potentiometer / galvanicstat (IVIUMSTAT). In this case, each specimen was used as a working electrode, the reference electrode was an Ag / AgCl electrode, and a platinum wire was used as a counter electrode.

Referring to the results shown in FIG. 5, in the case of specimen 1, the corrosion potential (corrosion potential, Ecorr) is 27 mV, whereas in specimen 2, the corrosion potential is 770 mV, indicating an improvement of about 25 times. The corrosion potential of specimen 2 corresponds to the level of titanium, supporting the significant improvement in the electrochemical properties of specimen 2.

6A and 6B show the results of observing the surface states of specimens 1 and 2 after the experiment was completed, respectively. 6a and 6b, it can be seen that in the case of specimen 2, the surface of the specimen 1 still remains in good condition, while in the specimen 1, the surface of the severe corrosion remains.

Table 1 shows the results of measuring the thermal conductivity of aluminum (Samples 3, 5) formed only an anodized film and aluminum (Samples 4, 6) formed a thermally conductive coating layer using the composition of Experimental Example 1 on the anodized film. Is shown. At this time, the thickness of the anodization film of the specimen 3 and 4 was 20㎛, respectively, and the thickness of the anodization film of the specimen 5 and 5 was 55㎛.

Psalter Anodization thickness Thermal conductive coating 25 ℃ (W / mk) 80 ℃ (W / mk) 3
(Comparative Example) 20 탆 No 16.03 16.81 4 20 탆 Yes 31.81 32.40 5
(Comparative Example) 55 μm No 15.53 16.51 6 55 μm Yes 18.61 21.1

Comparing specimens 3 and 4 in Table 1, the thermal conductivity at 25 ° C. was 31.81 W / mK for specimen 4, which was about 2 times higher than that of specimen 3 16.03 W / mK. The results were similar.

In the case of specimens 5 and 6, in which the thickness of the anodization layer was thicker, specimen 6 having a thermally conductive coating layer showed better thermal conductivity at 25 ° C and 80 ° C.

From this, it can be seen that the case in which the thermally conductive coating layer is formed shows better thermal conductivity than the case where it is not.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

200: substrate 210: anodization film
220: coating layer 300: aluminum
310: stainless steel 320: anodized film
330: thermal conductive coating layer

Claims (22)

Ceramic sol in which ceramic nanoparticles in which an organofunctional silane compound is bound are dispersed in water;
A crosslinking agent; And
Carbon-based thermally conductive fillers;
Thermal conductive coating layer composition comprising a. The method according to claim 1,
1 to 50% by weight of the ceramic nanoparticles, 1 to 50% by weight of the organofunctional silane compound, 0.5 to 10% by weight of the crosslinking agent, 40 to 95% by weight of water, and the carbon-based thermoelectric A composition for forming a thermally conductive coating layer containing 0.2 to 5% by weight of a conductive filler. The method of claim 1,
The organofunctional silane compounds include 3-glycidoxypropyltrimethoxy silane, 3-glycidoxypropyltriethoxy silane, 3-glycidoxypropyltriethoxy silane and 3-glycidoxypropylmethyldimethoxy 3-glycidoxypropylmethyldimethoxy silane, 3-glycidoxypropylmethyldiethoxy silane, methyltrimethoxy silane, methyltriethoxysilane, ethyltrimethoxy silane ethyltrimethoxy silane, ethyltriethoxy silane, dimethyldimethoxy silane, dimethyldiethoxy silane, vinyltrimethoxy silane, vinyltriethoxy silane ) And tetraethoxy orthosilcate (tetraethoxy orthosilcate) comprising a thermally conductive coating layer containing one or more selected from the group consisting of For the composition. The method of claim 1,
The crosslinking agent is a composition for forming a thermally conductive coating layer comprising at least one selected from the group consisting of phosphates, alkoxides, amino silanes, acids and amides. The method of claim 1,
The crosslinking agent forms a thermally conductive coating layer comprising at least one member selected from the group consisting of sodium hexametaphosphate, citraconic acid, dicyamide, and cyclic siloxane. Composition. The method of claim 5,
The cyclic siloxane (cyclic siloxane) is a composition for forming a thermally conductive coating layer comprising polyhedral oligomeric silsesquioxane (POSS). The method of claim 1,
The ceramic nanoparticle is a composition for forming a thermally conductive coating layer comprising at least one selected from the group consisting of silicon oxide particles, aluminum oxide particles and titanium oxide particles. The method of claim 1,
The carbon-based thermally conductive filler is a composition for forming a thermally conductive coating layer comprising at least one selected from the group consisting of graphite, carbon black, nano carbon powder and carbon nanotubes. The method of claim 1,
PH of the composition is a composition for forming a thermally conductive coating layer having a range of 7 to 8. Hydrolyzing the organofunctional silane compound in water; And
Forming an organic-inorganic hybrid material dispersion by adding an aqueous ceramic sol, a carbon-based thermally conductive filler, and a crosslinking agent to the condensation product to cause a condensation reaction;
Method for producing a composition for forming a thermally conductive coating layer comprising a. The method of claim 10,
The organofunctional silane compounds include 3-glycidoxypropyltrimethoxy silane, 3-glycidoxypropyltriethoxy silane, 3-glycidoxypropyltriethoxy silane and 3-glycidoxypropylmethyldimethoxy 3-glycidoxypropylmethyldimethoxy silane, 3-glycidoxypropylmethyldiethoxy silane, methyltrimethoxy silane, methyltriethoxysilane, ethyltrimethoxy silane ethyltrimethoxy silane, ethyltriethoxy silane, dimethyldimethoxy silane, dimethyldiethoxy silane, vinyltrimethoxy silane, vinyltriethoxy silane ) And tetraethoxy orthosilcate (tetraethoxy orthosilcate) comprising a thermally conductive coating layer containing one or more selected from the group consisting of The method for the composition. The method of claim 10,
The crosslinking agent is a method for preparing a composition for forming a thermally conductive coating layer comprising at least one selected from the group consisting of phosphates, alkoxides, amino silanes, acids and amides. . The method of claim 10,
The crosslinking agent forms a thermally conductive coating layer comprising at least one member selected from the group consisting of sodium hexametaphosphate, citraconic acid, dicyamide, and cyclic siloxane. Method for producing a composition for. The method of claim 13,
The cyclic siloxane (cyclic siloxane) is a method for producing a composition for forming a thermally conductive coating comprising a polyhedral oligomeric silsesquioxane (POSS). The method of claim 10,
The ceramic nanoparticles of the aqueous ceramic sol is a method for producing a composition for forming a thermally conductive coating layer comprising at least one selected from the group consisting of silicon oxide particles, aluminum oxide particles and titanium oxide particles. The method of claim 10,
The carbon-based thermally conductive filler is a method for producing a composition for forming a thermally conductive coating layer comprising at least one selected from the group consisting of graphite, carbon black, nano carbon powder and carbon nanotubes.
Board; And
A thermally conductive coating layer formed by applying and crosslinking the composition for forming a thermally conductive coating layer of any one of claims 1 to 8 on at least one surface of the substrate;
Thermal conductor structure comprising a. 18. The method of claim 17,
The substrate is a thermal conductor structure comprising a material having an anodized film formed on one surface of the thermal conductive coating layer. 18. The method of claim 17,
The material is a thermal conductor structure comprising aluminum or magnesium. A substrate having an anodization film formed on at least one surface; And
Including a thermally conductive coating layer formed on the anodization film,
The thermally conductive coating layer is an organic-inorganic hybrid material produced by condensation and crosslinking between the organofunctional silane compound and the ceramic sol; And a carbon-based thermal conductive filler dispersed in the organic-inorganic hybrid material.
Thermal conductor structure comprising a. 21. The method of claim 20,
The size of the ceramic nanoparticles of the ceramic sol has a smaller value than the pore size of the anodic oxide film. A heat exchanger comprising a thermal conductor structure according to any one of claims 17 to 21.

Images