KR20160120685A - Heat radiation coating composite and heat radiator coated with the same - Google Patents

Abstract

A heat radiation coating composition is provided. The heat radiation coating composition according to one embodiment of the present invention comprises a coating layer forming component comprising a main resin; A carbon-based filler in an amount of 8 to 72 parts by weight based on 100 parts by weight of the main resin; And a physical property enhancing component for improving heat dissipation and adhesion. According to this, it is possible to realize a heat-radiating coating layer exhibiting excellent heat radiation performance as well as thermal radiation as well as thermal conductivity. In addition, since the heat-radiating coating layer implemented by the present invention has excellent adhesion with the surface to be coated, the heat-radiating coating layer is prevented from being peeled off during use, and after the heat-radiating coating layer is formed, physical, The durability of the coating layer can be maintained even by chemical stimulation. Furthermore, since the surface of the formed heat-radiating coating layer is very smooth and has excellent smoothness and excellent surface quality, it can be widely applied to all industries requiring heat radiation.

Description

TECHNICAL FIELD [0001] The present invention relates to a heat radiation coating composition,

The present invention relates to a heat radiation coating composition, and more particularly, to a heat radiation coating composition which exhibits excellent heat radiation performance after forming a heat radiation coating layer and has excellent durability of a coating layer, adhesion to a surface to be coated, And a heat dissipation unit covered with the heat dissipation unit.

Generally, a heat dissipating member is mounted on a heat-generating component in order to prevent malfunction caused by heat generated in various components provided in the apparatus during use of the electronic apparatus. A heat dissipating member such as a heat sink or a heat sink typically uses a metal having a high thermal conductivity so that the heat in the device or the component can be quickly discharged to the outside.

For example, the heat sink is formed by heating and melting aluminum, copper, and alloys thereof at a high temperature, and then extruding the metal using a metal mold having a predetermined shape to form a plurality of heat dissipating fins Have been generally employed.

However, in order to manufacture a heat sink having a plurality of heat radiating fins by extrusion molding, it is difficult to manufacture the heat sink and a separate mold corresponding to the heat sink is required to manufacture various types of heat sinks. . In addition, although the heat sink of a metal material may have a high thermal conductivity, there is a problem that the heat radiation efficiency to radiate the conducted heat into the air is very low. In order to solve this problem, attempts have been made to improve the heat radiating property by forming an oxide film through anodizing treatment of the metal heat sink surface. However, it is difficult to exhibit the desired heat radiation performance with the resultant oxide film, There is a problem that can not be sustained. Further, in an electronic device having a heat dissipating member made of a metal, it is difficult to reduce the weight due to the weight of the heat dissipating member, and there is a problem that the use of the heat dissipating member is limited for mobile electronic devices. To solve this problem, There is a problem that it is difficult to achieve the desired level of heat radiation performance when the thickness of the heat radiation member is reduced.

In order to solve this problem, attempts have recently been made to improve the heat radiation performance by forming a heat radiation coating layer on the heat radiation member. However, it is difficult to simultaneously achieve the durability, heat radiation performance and adhesive force with the surface to be coated of the heat radiation coating layer, There is a problem in that the surface quality of the heat-radiating coating layer is not very good, for example, the surface is uneven or the heat-radiating filler protrudes from the surface.

It has excellent adhesion to the coated surface, excellent durability against external physical and chemical stimuli such as heat / moisture / organic solvent, excellent surface quality of coating layer and remarkable improvement of heat radiation performance. It is urgently required to study a composition for forming a heat-radiating coating layer.

KR 0783263B1

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a heat radiation coating composition capable of exhibiting excellent heat radiation performance as well as thermal conductivity.

In addition, the present invention is very excellent in adhesion to the coated surface, so that peeling of the heat-dissipating coating layer during use is remarkably prevented, and after the heat-dissipating coating layer is formed, the coating layer is hardly affected by physical and chemical stimuli such as external heat, organic solvent, Which can maintain the durability of the heat radiation coating composition.

Another object of the present invention is to provide a heat-radiating coating composition which is capable of realizing a heat-radiating coating layer having a very smooth surface and excellent smoothness and having excellent surface quality.

In order to solve the above-described problems, the present invention provides a coating composition comprising: a coating layer-forming component comprising a main resin; A carbon-based filler in an amount of 8 to 72 parts by weight based on 100 parts by weight of the main resin; And a physical property enhancing component for improving heat dissipation and adhesion.

According to one embodiment of the present invention, the main resin is selected from the group consisting of glycidyl ether type epoxy resin, glycidyl amine type epoxy resin, glycidyl ester type epoxy resin, linear aliphatic type epoxy resin, rubber modified epoxy resin, And a derivative thereof. At this time, the epoxy resin preferably includes a glycidyl ether type epoxy resin including a bisphenol A type epoxy resin, more preferably an epoxy equivalent of 350 to 600 g / eq.

The coating layer-forming component may further include a curing agent containing at least one of an acid anhydride-based, amine-based, imidazole-based, polyamide-based, and polymercapt-based component. When the main resin contains a bisphenol A type epoxy resin, the curing agent may include a polyamide-based component. At this time, the polyamide-based component may be a polyamide-based component having an amine value of 180 to 300 mgKOH / g.

The curing agent containing the polyamide-based component may be included in an amount of 45 to 75 parts by weight based on 100 parts by weight of the bisphenol A type epoxy resin.

In addition, the carbon-based filler may include at least one of graphite and carbon black.

The carbon-based filler may be included in an amount of 17 to 42 parts by weight based on 100 parts by weight of the epoxy resin.

The carbon-based filler is carbon black, and may have an average particle diameter of 250 nm or less, more preferably 50 to 250 nm. The carbon-based filler may have a D90 of 260 nm or less.

Also, the physical property-enhancing component may be at least one selected from the group consisting of 3- (N-anil-N-glycidyl) aminopropyltrimethoxysilane, 3-glycidoxypropylmethylethoxysilane, gamma -glycidoxytrimethyldimethoxysilane, 3- At least one selected from the group consisting of glycidoxypropyltrimethoxysilane, 3-glycidoxypropyltriethoxysilane, 3-glycidoxypropylmethylmethoxysilane, and 3-glycidoxypropylmethyldimethoxysilane . ≪ / RTI >

The physical property enhancing component may be included in an amount of 2 to 5 parts by weight based on 100 parts by weight of the main resin.

 The coating layer-forming component may include a main resin including a bisphenol A type epoxy resin and a curing agent containing a polyamide-based component, and the carbon-based filler may include carbon black.

On the other hand, the present invention relates to a substrate; And a heat radiation coating layer formed by applying a heat radiation coating composition according to the present invention onto at least a part of the outer surface of the substrate and cured.

According to an embodiment of the present invention, the thickness of the heat-radiating coating layer may be 10 to 100 μm.

In addition, the heat-radiating coating layer may contain 5 to 30% by weight of a carbon-based filler based on the total weight of the heat-radiating coating layer.

In addition, the substrate may be formed of a material selected from the group consisting of a metal, a non-metal, and a polymer organic compound.

The heat-radiating coating composition of the present invention can realize a heat-radiating coating layer that exhibits excellent heat radiation performance as well as thermal conductivity as well as thermal conductivity. In addition, since the heat-radiating coating layer implemented by the present invention has excellent adhesion with the surface to be coated, the heat-radiating coating layer is prevented from being peeled off during use, and after the heat-radiating coating layer is formed, physical, The durability of the coating layer can be maintained even by chemical stimulation. Furthermore, since the surface of the formed heat-radiating coating layer is very smooth and has excellent smoothness and excellent surface quality, it can be widely applied to all industries requiring heat radiation.

1 to 3 are a perspective view and a partial sectional view of a heat dissipation unit according to an embodiment of the present invention, and Fig.
4 to 5 are perspective views of a substrate according to an embodiment of the present invention.

Hereinafter, the present invention will be described in more detail.

The heat radiation coating composition according to an embodiment of the present invention includes a coating layer forming component including a main resin, a carbon-based filler, and a physical property enhancing component for improving heat dissipation and adhesion, Is contained in an amount of 8 to 72 parts by weight.

First, the coating layer forming component will be described.

The coating layer forming component may further include a main resin, and when the main resin is a curable resin, a curing agent may be further included, and other curing accelerators and a curing catalyst may be further included.

The main resin can form a coating layer and can be used without limitation in the case of components known in the art. However, in order to achieve both the adhesion to the coated substrate, the heat resistance not to be brittle by heat of the heat generating substrate, the mechanical strength, and the improvement of the heat dissipation performance due to the improvement of compatibility with the carbon-based filler, Epoxy resin, glycidylamine-type epoxy resin, glycidyl ester-type epoxy resin, linear aliphatic epoxy resin, rubber-modified epoxy resin, and derivatives thereof.

Specifically, the glycidyl ether type epoxy resin includes a glycidyl ether of a phenol and a glycidyl ether of an alcohol, and the glycidyl ether of the phenol includes bisphenol A, bisphenol B, bisphenol AD, Phenolic novolacs such as phenol novolac epoxy, aralkyl phenol novolak, terphenol phenol novolac, and o-cresol novolac such as bisphenol type epoxy such as S type, bisphenol F type and resorcinol, And cresol novolak type epoxy resins such as epoxy. These resins can be used alone or in combination of two or more.

N, N, N ', N'-tetraglycidyl-m-xylylene diamine, 1,3, 2,4,6-tetramethylhexylamine, Triglycidyl-m-aminophenol, triglycidyl-p-aminophenol and the like having both a structure of bis (diglycidylaminomethyl) cyclohexane, glycidyl ether and glycidylamine, Two or more species can be used in combination.

The glycidyl ester type epoxy resin may be an epoxy resin made of p-hydroxybenzoic acid, polycarboxylic acid such as phthalic acid or terephthalic acid, and hydroxycarboxylic acid such as? -Hydroxynaphthoic acid, and may be used alone or in combination of two or more can do.

Examples of the linear aliphatic epoxy resin include 1,4-butanediol, 1,6-hexanediol, neopentyl glycol, cyclohexanedimethanol, glycerin, trimethylolethane, , Dodecahydrobisphenol F, ethylene glycol, propylene glycol, polyethylene glycol, polypropylene glycol and the like, which may be used alone or in combination of two or more.

The rubber-modified epoxy resin is not particularly limited as long as it is an epoxy resin having a rubber and / or a polyether in the skeleton. For example, an epoxy resin chemically bonded in the molecule with a carboxyl group-modified butadiene-acrylonitrile elastomer (CTBN- Modified epoxy resin, an acrylonitrile-butadiene rubber-modified epoxy resin (NBR-modified epoxy resin), a urethane-modified epoxy resin, and a silicone-modified epoxy resin, which may be used alone or in combination of two or more have.

However, in view of the heat dissipation properties, the durability improvement of the coating layer, and the improvement of the surface quality of the heat-dissipating coating layer, the main resin contains a bisphenol A type epoxy resin It may be a glycidyl ether type epoxy resin.

The bisphenol A type epoxy resin may have an epoxy equivalent of 350 to 600 g / eq. If the epoxy equivalent is less than 350 g / eq, the hardness of the coating layer increases and cracks or cracks may easily occur. If the epoxy equivalent is more than 600 g / eq, there is a problem that the chemical resistance, adhesion and durability may be lowered due to occurrence of uncured portions.

The bisphenol A type epoxy resin may have a viscosity of 10 to 200 cps. If the viscosity of the bisphenol A type epoxy resin is less than 10 cps, it may be difficult to form a coating layer, and the adhesion strength with the coated surface may be decreased even after the formation. When the viscosity exceeds 200 cps, And the coating process may not be easy. Especially, in the case of the spraying type coating, further coating process may be difficult. Further, there is a problem that the dispersibility of carbon black in the coating layer may be deteriorated

The curing agent contained in the coating layer forming component together with the epoxy resin as the main resin may be varied depending on the specific type of the epoxy resin selected. Specific examples of the curing agent include those known in the art, Preferably one or more components selected from the group consisting of acid anhydride, amine, imidazole, polyamide and polymercaptan.

Specifically, in the case of the acid anhydride system, an anhydride of a compound having a plurality of carboxyl groups in one molecule is preferable. For example, the acid anhydride is selected from the group consisting of phthalic anhydride, trimellitic anhydride, pyromellitic anhydride, benzophenone tetracarboxylic anhydride, ethylene glycol bistrimellitate, glycerol tris trimellitate, maleic anhydride, tetrahydrophthalic anhydride, methyl Phthalic anhydride, tetrahydrophthalic anhydride, endomethylenetetrahydrophthalic anhydride, methylendomethylenetetrahydrophthalic anhydride, methylbutenyltetrahydrophthalic anhydride, dodecenylsuccinic anhydride, hexahydrophthalic anhydride, methylhexahydrophthalic anhydride, methyl succinic anhydride, methylcyclohexene Dicarboxylic anhydride, chlorendic anhydride, and the like, or a combination of two or more thereof.

The amine system may be aromatic amines, aliphatic amines, or modified products thereof. Examples of the aromatic amines include metaphenylenediamine, diaminodiphenylmethane, diaminodiphenylsulfone, and azomethylphenol, which may be used alone or in combination of two or more. As the aliphatic amines, for example, diethylenetriamine, triethylenetetramine, etc. may be used alone or in combination of two or more.

The polyamides may be, for example, polyamide amines having a plurality of amino groups in the molecule and having one or more amide groups as reactants produced by the condensation of dimer acid and polyamine, which are aliphatic acids.

Examples of the imidazole compounds include, for example, 2-methylimidazole, 2-ethyl-4-methylimidazole, 1-cyanoethyl-2-undecylimidazolium trimellitate and epoxy imidazole adduct adduct < / RTI >

In the above polymercaptan system, for example, a mercaptan group may be present at the terminal of the polypropylene glycol chain, or a mercaptan group may be present at the terminal of the polyethylene glycol chain.

Instead of or in combination with the above-mentioned curing agent, known curing agents such as phenol resin, amino resin, and polysulfide resin may be included according to the purpose.

According to an embodiment of the present invention, when the bisphenol A type epoxy resin is included as the main resin, the coating layer forming component may further include a polyamide-based component as a curing agent, Among them, it is very advantageous for improving compatibility with carbon black, and is advantageous in all physical properties such as adhesiveness, durability and surface quality of a coating layer, and the surface to which the heat radiation coating composition is applied is not a flat surface, There is an advantage that cracks are generated or peeled from the heat-radiating coating layer formed in the corresponding portion. The polyamide-based component may have an amine value of 180 to 300 mgKOH / g, and more preferably a viscosity of 50,000 to 70,000 cps at 40 ° C in order to exhibit improved physical properties.

If the amine value of the polyamide-based curing agent is less than 180 mgKOH / g, the curing quality deteriorates and the surface quality, durability and adhesiveness may be lowered, and the heat radiation performance may be lowered at the same time. In addition, if the amine value exceeds 300 mgKOH / g, the curing may proceed rapidly and aggregation may occur in the coating. If the viscosity of the polyamide-based curing agent is less than 50,000 cps, there is a problem of falling down after coating. If the viscosity exceeds 70,000 cps, uniform coating may not be performed during spray coating, and nozzle clogging and clogging may occur.

The coating layer forming component may include the polyamide curing agent in an amount of 45 to 75 parts by weight based on 100 parts by weight of the main resin, for example, a bisphenol A type epoxy resin when the main resin is a bisphenol A type epoxy resin. If the amount of the polyamide-based curing agent is less than 45 parts by weight, there is a problem of unhardened problems and durability deterioration. If the amount of the polyamide-based curing agent is more than 75 parts by weight, there may be problems such as cracking due to excessive curing.

On the other hand, the above-mentioned coating layer forming component may further include a curing accelerator in addition to the above-mentioned curing agent when the main resin is a curable resin. The curing accelerator serves to adjust the curing rate and the physical properties of the cured product, and a known curing accelerator may be selected and used according to the type of the curing agent selected. Examples of the curing accelerator include amines, imidazoles , Organic phosphines, and Lewis acid curing accelerators. When a polyamide-based curing agent is used, for example, a phenol or an amine-based curing accelerator may be used in combination. In this case, the amount of the curing accelerator may be appropriately changed in consideration of the equivalent amount of the epoxy resin. Also, the curing catalyst may be selected in consideration of the type of the main resin selected, the kind of the curing agent, and the like. The amount of the curing catalyst may be appropriately changed in consideration of the content of the main resin and the curing agent, the epoxy equivalent, The present invention is not particularly limited to this.

Next, the carbon-based filler for improving the heat radiation performance will be described.

When the carbon-based filler contains carbon, the carbon-based filler can be used without limitation, and a carbon-based material known in the art can be used. In addition, the shape and size of the carbon-based filler are not limited and may be porous or non-porous in structure, and may be selected depending on the purpose. However, the present invention is not particularly limited thereto. Examples include carbon nanotubes such as single-walled carbon nanotubes, double-walled carbon nanotubes, and multi-walled carbon nanotubes, graphene, graphene oxide, graphite, carbon black, and carbon- can do. However, it may preferably include at least one of graphite and carbon black in terms of facilitating achievement of desired physical properties such as excellent heat radiation performance, easy formation of a coating layer, and surface quality of a coating layer, More preferably carbon black.

The carbon black may be selected from at least one kind of known carbon black such as furnace black, lamp black, and channel black, and may be used without limitation. However, the carbon black preferably has an average particle diameter of 250 nm or less, more preferably 50 to 250 nm. If the average particle diameter exceeds 250 nm, there may be a problem of lowering the uniformity of the surface. If the average particle diameter is less than 50 nm, the product unit price may increase, and the amount of carbon black There is a problem that heat radiation performance may be deteriorated. Particularly, carbon black provided for surface quality may have a D90 of 260 nm or less in volume cumulative particle size distribution. If D90 exceeds 260 nm, the surface quality of the coating layer may be particularly deteriorated, for example, the surface roughness of the coating layer is increased. D90 means the particle diameter of the carbon black particles when the cumulative particle size distribution is 90%. Specifically, the volume cumulative value (100%) of all the particles in the graph (volume particle size distribution) obtained by taking the volume cumulative frequency from the side having the smallest particle diameter on the horizontal axis and the particle diameter on the vertical axis, The particle size corresponding to 90% of the cumulative value corresponds to D90. The volume cumulative particle size distribution of the carbon black can be measured using a laser diffraction scattering particle size distribution device.

In the case of the carbon-based filler, a carbon-based filler whose surface is modified with functional groups such as a silane group, an amino group, an amine group, a hydroxyl group and a carboxyl group can be used. At this time, the functional group is directly bonded to the surface of the carbon- Or may be indirectly bonded to a carbon-based filler via a substituted or unsubstituted aliphatic hydrocarbon having 1 to 20 carbon atoms or a substituted or unsubstituted aromatic hydrocarbon having 6 to 14 carbon atoms. Further, the carbon-based material may be a core or a shell, and the different material may be a core-shell type filler constituting a shell or a core.

The carbon-based filler is contained in an amount of 8 to 72 parts by weight based on 100 parts by weight of the resin of the present invention, and preferably 17 to 42 parts by weight in order to exhibit improved physical properties.

If the carbon-based filler is contained in an amount of less than 8 parts by weight based on 100 parts by weight of the main resin, there is a problem that the desired heat radiation performance may not be exhibited. If the amount of the carbon-based filler is more than 72 parts by weight, the adhesion of the coating layer is weakened and peeling is easily caused, and the hardness of the coating layer becomes large, so that it can be easily broken or broken by physical impact. Also, as the amount of the carbon-based filler protruded on the surface of the coating layer increases, the surface roughness may increase and the surface quality of the coating layer may be deteriorated. In addition, even if a carbon-based filler is further included, the degree of improvement in heat radiation performance may be insignificant.

On the other hand, if the carbon-based filler is contained in an amount of more than 42 parts by weight, the carbon-based filler may be added in a proportion of not more than 42 parts by weight, It is difficult to uniformly coat the surface of the composition when coated by a coating method such as a spraying method and the dispersibility of the carbon-based filler dispersed in the composition is lowered so that even when the composition is applied to the coated surface, There is a problem that they are uniformly dispersed and arranged, and thus there is a problem that uniform heat radiation performance on the entire surface of the coating layer may be difficult to manifest.

Next, the physical property enhancing components included in the heat radiation coating composition will be described.

The above-mentioned physical property enhancing component functions to improve durability by exhibiting improved heat dissipation as well as exhibiting excellent adhesiveness when the heat radiation coating composition according to the present invention is coated on the coated surface.

The above-mentioned physical property-enhancing component may be a silane-based compound, and known silane-based compounds employed in the art may be used without any limitation. Among them, the main resin of the coating layer- The silane-based compound is preferably selected from the group consisting of 3- (N-anil-N-glycidyl) aminopropyltrimethoxysilane, 3-glycidoxypropylmethyl Trimethyldimethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropyltriethoxysilane, 3-glycidoxypropylmethylmethoxysilane, and 3-glycidoxypropyltrimethoxysilane. And diphenylpropylmethyldimethoxysilane. The term " a "

The physical property enhancing component may be included in an amount of 2 to 5 parts by weight based on 100 parts by weight of the main resin. If the physical property enhancing component is contained in an amount of less than 2 parts by weight, desired properties such as heat dissipation through the physical property enhancing component and adhesiveness can not be achieved at the same time. In addition, if the amount is more than 5 parts by weight, there may be a problem of weakening adhesion with the coated surface.

Meanwhile, the heat radiation coating composition may further include a dispersant and a solvent for improving the dispersibility of the carbon-based filler.

The dispersant may be a known component employed in the art as a dispersant for a carbon-based filler. For example, a polyester dispersant, a polyphenylene ether dispersant, Polyolefin-based dispersant, polyetherimide-based dispersant, polyether sulfone-based dispersant, polyarylate-based dispersant, polyarylate-based dispersant, polyarylate-based dispersant, polyamide-based dispersant, polyamideimide- Phenylene sulfide-based dispersants, polyimide-based dispersants; Based dispersants, polyether ketone-based dispersants, polybenzoxazole-based dispersants, polyoxadiazole-based dispersants, polybenzothiazole-based dispersants, polybenzimidazole-based dispersants, polypyridine-based dispersants, polytriazole- Based dispersing agent, a polysulfone-based dispersing agent, a polyurea-based dispersing agent, a polyurethane-based dispersing agent or a polyphosphazene-based dispersing agent, and the like, or a mixture or copolymer of two or more selected from these. Further, for example, a reaction product in which a urea component and an aldehyde component such as isobutylaldehyde are condensed can be used as a dispersant.

In addition, the solvent may be selected according to the selected main resin, curing agent, and the like. Therefore, the solvent is not particularly limited in the present invention. Any solvent which permits proper dissolution of each component may be used as the solvent. For example, in the group consisting of an aqueous solvent such as water, an alcohol solvent, a ketone solvent, an amine solvent, an amine solvent, an ester solvent, an amide solvent, a halogenated hydrocarbon solvent, an ether solvent and a furan solvent At least one selected may be used.

In addition, the heat radiation coating composition described above can be used in various coating compositions such as leveling agents, pH adjusting agents, ion scavengers, viscosity modifiers, thixotropic agents, antioxidants, heat stabilizers, light stabilizers, ultraviolet absorbers, colorants, , Antifungal agents, antiseptics, and the like may be added. The various additives described above may be those known in the art and are not particularly limited in the present invention.

The heat radiation coating composition according to an embodiment of the present invention may have a viscosity of 50 to 250 cps at 25 ° C. If the viscosity of the heat radiation coating composition is less than 50 cps, there is a problem that the coating layer may be difficult to form due to the flow of the composition or the like, and the adhesion with the coated surface may be weakened even after the composition is formed. The coating may not be uniform, and the coating process may not be easy. Especially, when the coating is spraying, the coating process may be further difficult. Further, there is a problem that the dispersibility of carbon black in the coating layer may be deteriorated.

1, the present invention includes a substrate 10a and a heat-dissipating unit 10b including a cured heat-radiating coating layer 10b coated with a heat-radiating coating composition according to the present invention on at least a portion of the outer surface of the substrate 10a, (100).

The base material 10a may be employed without limitation regardless of whether the base material 10a has a mechanical strength enough to form a coating layer after the heat radiation coating composition according to the present invention is applied regardless of whether or not the base material 10a has a heat radiation characteristic. Accordingly, the substrate 10a may be made of a metal, a non-metal, or a polymer organic compound. The metal may be formed of any one metal selected from the group consisting of aluminum, copper, zinc, silver, gold, iron, oxides thereof, and alloys of the metals. In addition, the base metal may be a component commonly referred to as aluminum oxide, typically ceramic. The polymer organic compound may be at least one selected from the group consisting of polyethylene, polypropylene, polystyrene, polyvinyl chloride, acrylonitrile-butadiene-styrene resin (ABS), acrylonitrile-styrene resin (AN), methacrylic resin (PMMA) Polyacetal, polycarbonate, polyethylene terephthalate (PET), polybutylene terephthalate (PBT). Polymer organic compounds commonly known as plastics such as fluororesins, phenoxy resins, phenol resin (PE), urea resin (UF), melamine resin (MF), unsaturated polyester resin (UP), epoxy resin, polyurethane resin Lt; / RTI >

The shape of the substrate 10a is not limited. When the substrate 10a is a substrate having heat dissipation characteristics, it may be a structure having a plurality of finned heat dissipation fins 10a ₁ as shown in FIG. 1 to widen the surface area for radiating heat to the outside. Or substrate, as shown in FIG. 2 (10a) may be a radiating fin (10a ₂₎ a structure having a plate-shaped. Alternatively, as shown in Fig. 3, the base 12a may be a base 12a having a structure in which both ends of the base plate are folded upward so as to face each other to function as a radiating fin. 3, the heat dissipation unit 100 '' is formed of the heat dissipation coating layer 10b, 11b, and 12b formed of the heat dissipation coating composition according to an embodiment of the present invention, 1 and 2, the heat radiating performance of the heat radiating substrate may be much better than that of the heat radiating substrate having only the shape as shown in FIG. 1 or 2, which is structurally increased in surface area without the heat radiating coating layer. There is an advantage that a desired level of heat radiation performance can be achieved without employing substrates 10a and 11a which are difficult to be structurally structured as shown in Figs. 1 and 2, and in which manufacturing time and manufacturing cost can be increased.

1 and 2, even when the substrate 10a or 11a has a complicated shape including a plurality of heat-radiating fins 10a ₁ and 11a ₁ , the heat-radiating coating layer is excellent in adhesiveness, The heat-radiating coating layer may be peeled off or cracked.

Since the thickness, length, width, etc. of the substrates 10a, 11a and 12a can be variously changed according to the size and position of the application site where the heat dissipating units 100, 100 ', 100 "are provided, Not limited.

3, the base material 12a may further include a functional layer 12c between the outer surface and the heat-radiating coating layer 12b, and the functional layer may be provided between the outer surface and the heat- A separate primer layer or an oxide film formed by surface modification of the outer surface of the base material 12a such as anodizing for the purpose of improving heat radiation performance.

The heat radiation coating composition according to the present invention is coated on at least one region of the above-described substrate 10a, 11a, 12a to form a heat radiation coating layer. Unlike FIGS. 1 to 3, only a part of the substrate 10a, 11a, Can be formed. This is because the area covered with some coating may vary depending on the desired level of heat radiation performance, so the present invention is not limited thereto.

The heat-radiating coating layers 10b, 11b and 12b are formed by curing the heat-radiating coating composition according to the present invention on the outer surface of the substrate. As a specific method of forming the heat-radiating coating layers 10b, 11b, and 12b, a known method of coating a heat-radiating coating composition on a substrate can be selected and used. Examples thereof include spray, dip coating, silk screen, roll Coating, dip-coating, spin-coating, or the like.

The coating composition may be formed into a coating layer by treating heat and / or light according to the type of the main resin of the coating layer forming component used in the curing after the coating, or the type of the curing agent included in the case of the curing type main resin. The temperature of the applied heat and / or the intensity of the light and the treatment time may vary depending on the type of the main resin used, the kind of the hardener, the content thereof, the thickness of the coating film, and the like. For example, when the above-mentioned bisphenol A type epoxy resin is included as a main resin and a polyamide curing agent is provided, it can be treated at a temperature lower than the strain point of the substrate at a temperature of 60 ° C to 300 ° C for 10 minutes to 120 minutes. If the treatment temperature is less than 60 ° C, the heat radiation coating composition is difficult to be coated on the substrate, and if the treatment temperature is higher than 300 ° C, there is a problem that the base material is deformed or the manufacturing cost is increased. Also, when the treatment time is shorter than 10 minutes, it is difficult for the radiation coating composition to be coated on the substrate. If the surface treatment time exceeds 120 minutes, the radiation time of the radiation device is unnecessarily increased. It is preferable that the surface treatment process is performed for 10 minutes to 120 minutes.

In addition, the heat radiation coating composition used in the present invention may be in contact with a solid substrate, especially a metal substrate, and then exposed to air to form a film that rapidly cures at room temperature or below 50 DEG C within a few minutes without stickiness, And the final curing can be carried out at a relatively low temperature, so that not only the workability is excellent but also the deformation of the metal substrate during curing can be prevented.

The heat-radiating coating layers 10b, 11b, and 12b may have a thickness of 10 to 100 mu m, and more preferably 15 to 50 mu m. If the thickness exceeds 100 탆, there may be a problem that the coating surface may have a boiling phenomenon, and if the thickness is less than 10 탆, the heat dissipation characteristics may be deteriorated.

The heat-radiating coating layers 10b, 11b, and 12b may include 5 to 30 wt% of a carbon-based filler based on the total weight of the heat-radiating coating layer. When the carbon-based filler is contained in the heat-radiating coating layer in an amount of less than 5% by weight, heat radiation performance of a desired level may not be exhibited. If the amount of the carbon-based filler is more than 30% by weight, the adhesion of the coating layer is weakened and peeling easily occurs, and the hardness of the coating layer becomes large, so that it is easily broken or broken by physical impact. Also, as the amount of the carbon-based filler protruded on the surface of the coating layer increases, the surface roughness may increase and the surface quality of the coating layer may be deteriorated. In addition, even if a carbon-based filler is further included, the degree of improvement in heat radiation performance may be insignificant.

On the other hand, the heat radiation coating composition for forming the heat radiation coating layer of the present invention can improve the bending strength of the coating layer, the adhesion strength between the coating layer and the substrate, the wettability and weatherability of the coating layer and the wettability of the carbon- And the surface of the substrate on which the heat radiation coating layer is formed can be increased. In addition, since the heat dissipating unit exhibits excellent heat dissipation, excellent solvent resistance to an organic solvent, has no discoloration upon curing, and is easy to control the heat conductivity, the heat dissipating unit including the heat dissipating coating layer can continuously exhibit improved physical properties. Accordingly, it is possible to provide a lighting device such as an LED lamp, an energy charging device, a heater device, a display device, a power device such as an engine or a motor, an energy storage device such as a battery, an electric appliance such as a heat exchanger, It can be widely applied to a heat dissipation unit or a housing in the entire space industry.

The present invention will now be described more specifically with reference to the following examples. However, the following examples should not be construed as limiting the scope of the present invention, and should be construed to facilitate understanding of the present invention.

≪ Example 1 >

The coating layer forming component was composed of 65 parts by weight of a polyamide curing agent (Kukdo Chemical, G-5022) relative to 100 parts by weight of a bisphenol A type epoxy resin (YD-011) having an epoxy equivalent of 550 g / , 22 parts by weight of carbon black having an average particle diameter of 150 nm and a D90 of 190 nm, 3 parts by weight of a physical property enhancing component (Shanghai Tech Polymer Technology, Tech-7130) as an epoxy silane compound, 3 parts by weight of a dispersant (a mixture of isobutylaldehyde and urea 18 parts by weight as a solvent, 18 parts by weight of methyl ethyl ketone, 28.8 parts by weight of toluene and 285 parts by weight of cyclohexanone were mixed and stirred. After stirring, the bubbles contained in the mixture were removed, and the final viscosity was adjusted to 100 to 130 cps based on 25 ° C to prepare a radiation coating composition as shown in Table 1 below, and then stored at 5 ° C.

≪ Examples 2 to 20 &

Table 1, Table 2, or Table 3 were prepared in the same manner as in Example 1 except that the kind, average particle size, particle size distribution, and kind of the coating layer forming component were changed, 3 was prepared.

≪ Comparative Examples 1 to 4 >

The heat-radiating coating composition as shown in Table 4 was prepared by changing the content of the carbon-based filler and the type of the heat-radiating filler as shown in Table 4 below.

<Experimental Example 1>

The heat-radiating coating compositions prepared in Examples and Comparative Examples were each coated with an aluminum material (Al 1050) having both side edges bent in the upward direction as shown in FIG. 4 and having a thickness of 1.5 mm and a width of 35 mm 34 mm 12 mm Weight 8.12 g A heat dissipating unit having a heat-treated heat-dissipating coating layer formed at a temperature of 150 ° C for 10 minutes was spray-coated on the entire surface of the substrate so as to have a final thickness of 25 μm and evaluated for the following physical properties. Respectively.

1. Thermal Radiation Evaluation

After placing the heat dissipating unit in the center of the acrylic chamber having a size of 30 cm x 30 cm x 30 cm, the temperature inside the chamber and the temperature of the heat dissipating unit were adjusted to be 25 ± 0.2 ° C. Then, a heat source (a copper block to which a ceramic heater was attached) was attached to a heat dissipation unit using a TIM (thermal conductive tape: 1 W / mk) to prepare test specimens. A constant current was applied to the heat source of the manufactured specimen to generate heat, and after maintaining for 1 hour, the temperature of the heat dissipating unit was measured to evaluate the heat emissivity. Specifically, the thermal emissivity was calculated according to the following equation based on the temperature measured under the same conditions for a substrate having no heat-radiating coating layer.

[Mathematical Expression]

Thermal emissivity (%) = {1- (temperature of test specimen (° C) / temperature of uncured substrate (° C))} × 100

However, in the case of Example 13 and Comparative Example 2, durability and adhesiveness were evaluated to be poor, and the radioactive evaluation was omitted.

2. Evaluation of uniformity of heat dissipation performance

After placing the heat dissipating unit in the center of the acrylic chamber having a size of 30 cm x 30 cm x 30 cm, the temperature inside the chamber and the temperature of the heat dissipating unit were adjusted to be 25 ± 0.2 ° C. After that, a heat source having a diameter of 15 mm, a thickness of 1.5 mm, and a temperature of 115 캜 was brought into direct contact with the lower surface of the lower side of the heat dissipating unit, and then the temperature at four points of bending points at the ends of the heat dissipating unit, Were measured continuously. Thereafter, the time required for the temperature of each of the four points to rise by 10 ° C was measured in seconds, and then the standard deviation of the four points was calculated. The smaller the standard deviation, the more uniform the heat dissipation performance can be, and the greater the dispersibility of the carbon-based filler in the heat-dissipating coating layer can be interpreted.

3. Durability evaluation

The surface state of the heat dissipating unit was visually evaluated after 480 hours from the disposition of the heat dissipating unit in the chamber having a temperature of 60 캜 and a relative humidity of 90%. As a result of the evaluation, the presence or absence of cracking and peeling (peeling) of the heat-radiating coating layer was checked.

4. Adhesion evaluation

The durability of the specimens was cross-cut with a knife so as to be spaced apart by 1 mm. After that, the scratched tape is attached to the cut surface and pulled at an angle of 60 ° to confirm that the coating layer is peeled off. Evaluation criteria were evaluated according to ISO 2409. (5B: 0%, 4B: 5% or less, 3B: 5-15%, 2B: 15-35%, 1B: 35-65%, 0B: 65%

5. Surface quality evaluation

In order to confirm the surface quality of the heat dissipating unit, it was checked whether it was rugged or rough by touching the surface by hand. If there is a feeling of smoothness 5, If the area of the rough feeling area is less than 2% of the total area of the outer surface of the heat dissipating unit 4, 2% When the area is 5% or less 3, 5% 2, for areas above 10% and below 20%, and for areas above 20%, 0, respectively.

Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Coating layer forming component Topic resin (type / epoxy equivalent (g / eq) / content (parts by weight)) BPA (YD-011) / 550/100 BPA (YD-011) / 550/100 BPA (YD-011) / 550/100 BPA (YD-011) / 550/100 BPA (YD-011) / 550/100 BPA (YD-011) / 550/100 BPA (YD-011) / 550/100 Curing agent (kind / amine value (mgKOH / g) / content (parts by weight)) PA (G-5022) / 220 /
65 PA (G-5022) / 220 /
65 PA (G-5022) / 220 /
65 PA (G-5022) / 220 /
65 PA (G-5022) / 220 /
65 PA (G-5022) / 220 /
65 PA (G-5022) / 220 /
65 Carbon-based filler Type / content (parts by weight) Carbon black / 22 Carbon black / 10 Carbon black / 15 Carbon black / 18 Carbon black / 40 Carbon black / 45 Carbon black / 68 Average particle diameter (nm) / D90 (nm) 150/192 150/192 150/192 150/192 150/192 150/192 150/192 Property enhancing component
(Parts by weight) 3 3 3 3 3 3 3 Heat-dissipating unit Coating layer thickness
(탆) 25 25 25 25 25 25 25 Heat Radiation (%) 14.53 12.35 13.55 14.04 14.53 14.53 14.65 Radiation performance
Uniformity 0.07 0.07 0.08 0.08 0.09 0.16 0.23 Adhesiveness 5B 5B 5B 5B 5B 4B 4B durability ○ ○ ○ ○ ○ ○ ○ Surface quality 5 5 5 5 5 5 3

Example 8 Example 9 Example 10 Example 11 Example 12 Example 13 Example 14 Coating layer forming component Topic resin (type / epoxy equivalent (g / eq) / content (parts by weight)) BPA (YD-011) / 550/100 BPA (YD-011) / 550/100 BPA (YD-011) / 550/100 BPA (YD-011) / 550/100 BPA (YD-011) / 550/100 BPA (YD-136) / 310/100 BPA (YD-012H) / 650/100 Curing agent (kind / amine value (mgKOH / g) / content (parts by weight)) PA (G-5022) / 220 /
65 PA (G-5022) / 220 /
65 PA (G-5022) / 220 /
65 PA (G-5022) / 220 /
65 PA (G-5022) / 220 /
65 PA (G-5022) / 220 /
65 PA (G-5022) / 220 /
65 Carbon-based filler Type / content (parts by weight) Carbon black / 22 Carbon black / 22 Carbon black / 22 Carbon black / 22 Carbon black / 22 Carbon black / 22 Carbon black / 22 Average particle diameter (nm) / D90 (nm) 31/64 58/65 234/253 261/280 240/272 150/192 150/192 Property enhancing component
(Parts by weight) 3 3 3 3 3 3 3 Heat-dissipating unit Coating layer thickness
(탆) 25 25 25 25 25 25 25 Heat Radiation (%) 14.53 14.53 14.53 14.15 14.00 - 12.95 Radiation performance
Uniformity 0.06 0.06 0.08 0.12 0.08 - 0.22 Adhesiveness 5B 5B 5B 5B 4B 0B 2B durability ○ ○ ○ ○ ○ × ○ Surface quality 5 5 5 4 3 5 5

Example 15 Example 16 Example 17 Example 18 Example 19 Example 20 Coating layer forming component Topic resin (type / epoxy equivalent (g / eq) / content (parts by weight)) BPF (YDF-2001) / 480/100 Rubber Modified Epoxy (KR-202C) / 380/100 DCPD (KDCP-150) / 280/100 BPA (YD-011) / 550/100 BPA (YD-011) / 550/100 BPA (YD-011) / 550/100 Curing agent (kind / amine value (mgKOH / g) / content (parts by weight)) PA (G-5022) / 220 /
65 PA (G-5022) / 220 /
65 PA (G-5022) / 220 /
65 Amidoamine (G-A0533) / 330 /
65 Alicyclic amine (KH-825) / 275 /
65 Penicillin (KMH-121X80) / 200 /
65 Carbon-based filler Type / content (parts by weight) Carbon black / 22 Carbon black / 22 Carbon black / 22 Carbon black / 22 Carbon black / 22 Carbon black / 22 Average particle diameter (nm) / D90 (nm) 150/192 150/192 150/192 150/192 150/192 150/192 Property enhancing component
(Parts by weight) 3 3 3 3 3 3 Heat-dissipating unit Coating layer thickness
(탆) 25 25 25 25 25 25 Heat Radiation (%) - 13.16 13.72 14.05 14.11 13.98 Radiation performance
Uniformity - 0.19 0.18 0.10 0.11 0.15 Adhesiveness 0B 1B 1B 2B OB 0B durability × ○ ○ ○ × × Surface quality 5 5 5 5 5 4

Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Coating layer forming component Topic resin (type / epoxy equivalent (g / eq) / content (parts by weight)) BPA (YD-011) / 550/100 BPA (YD-011) / 550/100 BPA (YD-011) / 550/100 BPA (YD-011) / 550/100 Curing agent (kind / amine value (mgKOH / g) / content (parts by weight)) PA (G-5022) / 220 /
65 PA (G-5022) / 220 /
65 PA (G-5022) / 220 /
65 PA (G-5022) / 220 /
65 filler Type / content (parts by weight) Carbon black / 5 Carbon black / 75 Titanium dioxide
/ 22 Carbon black / 22 Average particle diameter (nm) / D90 (nm) 150/192 150/192 208/255 150/190 Property enhancing component
(Parts by weight) 3 3 3 Not included Heat-dissipating unit Coating layer thickness
(탆) 25 25 25 25 Heat Radiation (%) 8.7 - 12.35 13.25 Radiation performance
Uniformity 0.07 - 0.13 0.28 Adhesiveness 5B 0B 5B 2B durability ○ × ○ × Surface quality 5 2 5 5

First, as shown in Table 1,

It can be confirmed that the heat radiation property and adhesiveness are simultaneously achieved in Examples 1, 4 and 5 in which the content of the carbon-based filler is within the preferable range of the present invention, as compared with Examples 2, 3, 6 and 7. [ Particularly, as can be seen in Examples 6 and 7, it can be confirmed that even when the content of the carbon-based filler is increased, the degree of improvement of the heat radiation property is insignificant, and the adhesiveness is rather lowered. It is also confirmed that the uniformity of the spinning performance is also lowered.

Next, as shown in Table 2,

It can be confirmed that the surface quality was lowered and the uniformity of the spinning performance was lowered in Examples 1 and 8, in which carbon black was contained in the same amount, in Example 11 having an average particle size exceeding 250 nm in Examples 8 to 12.

In addition, in Example 12 in which the D90 of carbon black exceeded 260 nm, the surface quality was remarkably lowered, and the adhesiveness was simultaneously decreased.

On the other hand, in the case of Example 13 in which the epoxy equivalent of the epoxy resin as the main resin is less than the preferable range, it can be confirmed that the adhesiveness and the durability are remarkably poor. In addition, in the case of Example 14 in which the epoxy equivalent of the epoxy resin as the main resin exceeds the preferable range, the adhesiveness remarkably deteriorated and the uniformity of the spinning performance also deteriorated.

Next, as shown in Table 3,

It can be confirmed that in Examples 15 to 17 in which epoxy resins other than the bisphenol A type epoxy were used as the main resin, the properties of two or more of heat radiation property, adhesiveness, durability and radiation uniformity were lowered , So that it is not suitable for achieving all the physical properties.

Further, in Examples 18 to 20, which were different from the polyamide type as the hardener, the radiation performance was lower than that of Example 1, and the adhesiveness and durability were remarkably lowered. In Example 20, Can be confirmed.

Next, as shown in Table 4,

In the case of Comparative Example 1 in which the content of the carbon-based filler is out of the range according to the present invention, it can be confirmed that the heat radiation property is not significantly better than in the case of the present invention. In addition, in the case of Comparative Example 2, it can be confirmed that the durability, the adhesiveness and the surface characteristics are very poor.

Comparative Example 3 in which the type of filler was titanium dioxide was excellent in adhesiveness and durability but the degree of heat radiation was in the level of Example 2. The filler content of Example 2 was less than 1/2 It can be expected that the carbon black is more excellent in heat radiation performance than titanium dioxide.

In addition, in Example 4, which does not contain the physical property enhancing component, it is confirmed that both the spinnability, the uniformity of the spinning performance, the adhesion and the durability are all lowered.

<Experimental Example 2>

(Example 4) prepared through the composition of Example 1 and the heat dissipation substrate (Comparative Production Example 5) as shown in Fig. 4 in which the heat dissipation coating layer was not treated and the structure (Comparative Production Example 6) having a thickness of 2 mm, a width of 35 mm x 34 mm x 12 mm and a weight of 24.33 g each of which was made of an aluminum material (Al 6063) Respectively.

1. Temperature change of heat source

After placing the heat dissipating unit in the center of the acrylic chamber having a size of 30 cm x 30 cm x 30 cm, the temperature inside the chamber and the temperature of the heat dissipating unit were adjusted to be 25 ± 0.2 ° C. Thereafter, a ceramic heater having a diameter of 15 mm and a thickness of 1.5 mm was directly contacted to the center of the lower surface of the lower plate of the heat-dissipating unit, and then a power source of 620 mA and 5.2 V was applied and the temperature of the heat source after 2 hours passed was measured.

2. Change in chamber internal temperature

After placing the heat dissipating unit in the center of the acrylic chamber having a size of 30 cm x 30 cm x 30 cm, the temperature inside the chamber and the temperature of the heat dissipating unit were adjusted to be 25 ± 0.2 ° C. Thereafter, a ceramic heater having a diameter of 15 mm and a thickness of 1.5 mm was directly contacted to the center of the lower surface of the lower plate of the heat-dissipating unit, and then a power of 620 mA and 5.2 V was applied and the temperature inside the chamber was measured for 2 hours.

Production Example 4 Comparative Preparation Example 5 Comparative Preparation Example 6 Heat-dissipating unit Presence of coating layer (Example 4) × × Heat source temperature (℃) 70.6 82.6 79.0 Chamber internal temperature (캜) 26.5 26.2 26.2

As can be seen in Table 5,

It can be seen that the heat radiating material of Comparative Production Example 6 having a large surface area has a somewhat higher heat radiation performance than the heat radiation substrate of Comparative Production Example 5. [

On the other hand, in Production Example 4 having a heat radiation coating layer implemented by the coating composition according to one embodiment of the present invention in the heat radiation substrate of Comparative Production Example 5 having a small surface area, the surface area of the heat radiation substrate itself was low, It can be confirmed that the heat radiation performance is improved by about 10%.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

10a, 11a, 12a: substrate 10b, 11b, 12b: heat-radiating coating layer
12c: functional layers 100, 100 ', 100 &quot;: heat dissipating units

Claims (19)

A coating layer forming component comprising a main resin;
A carbon-based filler in an amount of 8 to 72 parts by weight based on 100 parts by weight of the main resin; And
And a physical property enhancing component for improving heat radiation property and adhesion property. The method according to claim 1,
The subject resin may be selected from the group consisting of a glycidyl ether type epoxy resin, a glycidyl amine type epoxy resin, a glycidyl ester type epoxy resin, a linear aliphatic epoxy resin, a rubber modified epoxy resin and derivatives thereof Wherein the thermosetting coating composition comprises at least one selected from epoxy resin. The method according to claim 1,
Wherein the carbon-based filler comprises at least one of graphite and carbon black. The method according to claim 1,
Wherein the coating layer forming component further comprises a curing agent comprising at least one of an acid anhydride system, an amine system, an imidazole system, a polyamide system and a polymercaptan system. 3. The method of claim 2,
Wherein the main resin is a glycidyl ether type epoxy resin including a bisphenol A type epoxy resin. 6. The method of claim 5,
Wherein the bisphenol A type epoxy resin has an epoxy equivalent of 350 to 600 g / eq. The method according to claim 1,
Wherein the coating layer forming component comprises a bisphenol A type epoxy resin as a main resin and further comprises a polyamide component as a curing agent. 8. The method of claim 7,
Wherein the polyamide-based component is a polyamide-based component having an amine value of 180 to 300 mgKOH / g. The method according to claim 1,
The physical property enhancing component may be at least one selected from the group consisting of 3- (N-anil-N-glycidyl) aminopropyltrimethoxysilane, 3-glycidoxypropylmethylethoxysilane, gamma -glycidoxytrimethyldimethoxysilane, Glycidoxypropyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropylmethylmethoxysilane, and 3-glycidoxypropylmethyldimethoxysilane. . The method of claim 3,
Wherein the carbon-based filler is carbon black having an average particle size of 250 nm or less. 8. The method of claim 7,
Wherein the curing agent containing the polyamide-based component is provided in an amount of 45 to 75 parts by weight based on 100 parts by weight of the bisphenol A type epoxy resin. The method according to claim 1,
Wherein the carbon-based filler is contained in an amount of 17 to 42 parts by weight based on 100 parts by weight of the main resin. 10. The method of claim 9,
Wherein the physical property enhancing component is contained in an amount of 2 to 5 parts by weight based on 100 parts by weight of the main resin. The method according to claim 1,
Wherein the heat radiation coating composition has a viscosity of 10 to 200 cps. The method according to claim 1,
Wherein the coating layer-forming component comprises a main resin comprising a bisphenol A type epoxy resin and a curing agent comprising a polyamide-based component, wherein the carbon-based filler comprises carbon black. 11. The method of claim 10,
Wherein the carbon-based filler has a D90 of 260 nm or less. materials; And
A heat dissipation unit comprising a heat dissipation coating composition according to any one of claims 1 to 16 cured on at least a part of an outer surface of the substrate. 18. The method of claim 17,
Wherein the heat radiation coating layer has a thickness of 10 to 100 占 퐉. 18. The method of claim 17,
Wherein the heat dissipation coating layer comprises 5 to 30% by weight of a carbon-based filler based on the total weight of the heat dissipation coating layer.

Images