WO2023013834A1 - Heat sink paint composition, preparation method therefor, heat sink coating film formed therefrom, and heat sink comprising same - Google Patents

Abstract

The present application provides a heat sink paint composition comprising, on the basis of the total weight of the composition, 30-60 wt% of binder resin, 10-25 wt% of thermally conductive particles, 5-15 wt% of an additive, and 10-50 wt% of a solvent. The heat sink paint composition of the present application has excellent thermal emissivity.

Description

Heat-dissipating paint composition, manufacturing method thereof, heat-dissipating coating film formed therefrom, and heat sink including the same

This application claims the benefit of the filing date of Korean Patent Application No. 10-2021-0103515 filed with the Korean Intellectual Property Office on August 5, 2021, all of which are incorporated herein.

The present application relates to a heat-dissipating paint composition, and relates to a heat-dissipating coating film formed on a surface of a metal substrate with the composition and a heat sink including the coating film.

With the miniaturization, thinning and high performance of electronic products, heat control of semiconductor chips, PCBs, and components is becoming more important. Heat sinks and cooling fans have traditionally been used to solve or mitigate the heat generation problem of electronic products, but considering that slimming, high integration, and high capacity are the development directions of electronic products, as well as noise and vibration generation, they can be obstacles in designing electronic products. easy. In fact, graphite sheets with a thickness of only a few tens of microns, flat metal heat sinks, and vapor chambers are used as heat dissipation components for high-performance, thin electronic products such as mobile phones, OLED displays, and personal computers. These components rapidly spread heat in the horizontal direction to prevent local heat accumulation in electronic products, thereby suppressing rapid temperature rise in semiconductor chips or small hot spots.

On the other hand, in the case of a metal heat sink or vapor chamber, heat diffusion in the horizontal direction is excellent, but heat dissipation in the vertical direction is relatively inefficient. This is because the thermal conductivity of the metal material is high, but the surface thermal emissivity is low. Therefore, the surface of the heat sink, heat sink, vapor chamber, etc. made of metal components is treated with heat dissipation paint to improve the overall heat dissipation performance of the product.

Heat-dissipating paint is prepared by dispersing particles or fillers with excellent thermal conductivity in an organic, inorganic, or ceramic binder and adding a certain solvent to a viscosity suitable for processes such as spraying and dipping, and then used for coating.

Regarding thermally conductive particles or fillers, heat dissipation paints developed or commercialized so far typically use or absorb carbon-based graphite (graphite), carbon black, CNT, and graphene and non-carbon-based high thermal conductivity particles such as BN, AlN, and SiC. Ceramic particles emitting far-infrared rays as the main component use one type or a mixture of two or more types. Among these, CNTs having very high thermal conductivity in the transverse direction have limitations in realizing a heat dissipation effect because effective dispersion in the binder is difficult even though the production cost has recently been lowered. In addition, due to the nature of the nanomaterial, when the amount of addition is above a certain level, there is a problem in that aggregation occurs and physical properties are rapidly deteriorated, such as a decrease in adhesion to the substrate. In particular, apart from the heat dissipation performance of heat dissipation paints using materials such as graphene and BN, mass production of materials has not yet been achieved, so there are few known examples of heat dissipation paints using these materials commercially. Among the materials with excellent thermal conductivity, many heat dissipation paints using graphite with excellent cost performance have been reported, but no example with excellent heat dissipation performance compared to other materials has been reported.

Therefore, it is necessary to develop a heat dissipation paint having excellent heat dissipation performance and excellent hardness and durability.

One aspect of the present application is to provide a heat dissipation paint composition capable of forming a coating layer having excellent heat dissipation properties, adhesion, hardness, durability, etc. by one-time coating without pretreatment of the surface of a metal substrate.

One aspect of the present application is to provide a method for preparing the heat dissipating paint composition.

One aspect of the present application is to provide a heat-dissipating coating film formed using the heat-dissipating paint composition.

One aspect of the present application is to provide a heat sink including a heat-dissipating coating film formed using the heat-dissipating paint composition.

The problem of the present application is not limited to those mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the description below.

One embodiment of the present application, based on the total weight of the composition, 30 to 60% by weight of the binder resin; 10 to 25% by weight of thermally conductive particles; 5 to 15% by weight of additives; and 10 to 50% by weight of a solvent; It provides a heat dissipation paint composition comprising a.

In one embodiment of the present application, the binder resin includes a urethane resin or an epoxy resin, and the thermally conductive particles include at least one graphite selected from the group consisting of expanded graphite, impression graphite, artificial graphite, and earthy graphite; and metal particles; can include

In one embodiment of the present application, the composition is milled for 1 hour to 6 hours to separate graphene nanoplates (GNPs) or graphene from graphite. Specifically, the composition is exfoliated to separate graphene nanoplates (GNPs) or graphene from expanded graphite by milling.

The composition may include two or more of graphite particles, graphene nanoplate particles, and graphene particles after milling, or all of them. After the milling, the graphite particles, graphene nanoplate (GNP) particles, or graphene particles may have a diameter of 0.1 μm to 50 μm.

In one embodiment of the present application, the milling bead may be zirconia having a diameter of 0.05 mm to 3.0 mm.

In one embodiment of the present application, the composition may be cured by adding a diisocyanate-based curing agent or an amine-based curing agent.

In one embodiment of the present application, the expansion side edge may be graphite in which interlayer expansion is performed by heat treatment after acid treatment.

In one embodiment of the present application, the composition may have a viscosity of 300 cps or more to 1500 cps or less.

In one embodiment of the present application, the composition is a dibutyl tin dilaurate curing catalyst; and ethylene glycol, propylene glycol, diethylene glycol, 1,3-butanediol, 1,4-butanediol, neopentyl glycol, 3-methyl-1,5-pentanediol, 2-butyl-2-ethyl-1,3- Propanediol, 2,4-diethyl-1,5-pentanediol, 1,2-hexanediol, 1,6-hexanediol, 1,8-octanediol, 1,9-nonanediol, 2-methyl-1 a spacer selected from the group consisting of 8-octanediol, 1,8-decanediol, octanedecanediol, glycerin, trimethylolpropane, pentaerythritol and hexanetriol; may further include.

In one embodiment of the present application, the metal particles are at least one selected from the group consisting of aluminum, iron, copper, zinc, tin, titanium, nickel, antimony, magnesium, vanadium, chromium, and zirconium, and have a diameter of 5 to It may be a flake type with a size of 40 μm.

In one embodiment of the present application, the thermally conductive particles may include at least one carbon selected from the group consisting of carbon black, single-walled carbon nanotubes, multi-walled carbon nanotubes, graphene, and carbon fibers; and heat dissipating filler; may further include.

In one embodiment of the present application, the thermally conductive particles include 5 to 15% by weight of graphite; 1 to 6% by weight of metal particles; and 1 to 5% by weight of other thermally conductive particles; can include

In one embodiment of the present application, the urethane resin is acrylic polyol, caprolactone polyol, epoxy polyol, ester polyol, ether polyol, polycarbonate polyol, polyethylene glycol, polypropylene glycol, polytetramethylene glycol, ethylene glycol, diethylene Glycol, 1,3-butanediol, 1,4-butanediol, neopentyl glycol, 3-methyl-1,5-pentanediol, 2-butyl-2-ethyl-1,3-propanediol, 2,4-diethyl -1,5-pentanediol, 1,2-hexanediol, 1,6-hexanediol, 1,8-octanediol, 1,9-nonanediol, 2-methyl-1,8-octanediol, 1,8 - It may be at least one selected from the group consisting of decanediol, octanedecanediol, glycerin, trimethylolpropane, pentaerythritol, hexanetriol, and polypropylene glycol.

In one embodiment of the present application, the epoxy resin is a bisphenol-based epoxy, a phenol novolac-based epoxy, an o-cresol novolac-based epoxy, a multifunctional epoxy, an amine-based epoxy, or a heterocycle containing Epoxy, substitution type epoxy, naphthol type epoxy, bisphenol A epoxy resin, epichlorhydrin type epoxy resin. Ethylene glycol glycidyl ether, polyethylene glycol diglycidyl ether, glycerin diglycidyl ether, glycerin triglycidyl ether, 1,6-hexanediol diglycidyl ether, trimethylolpropane triglycidyl ether, diglycidyl Cidylaniline, diglycidylamine, N,N,N',N'-tetraglycidyl-m-xylenediamine and 1,3-bis(N,N'-diglycidylaminemethyl)cyclohexane It may be at least one or more selected from the group consisting of.

In one embodiment of the present application, the diisocyanate-based curing agent forming the urethane binder includes hexamethylene diisocyanate (HDI), trimethylene diisocyanate, tetramethylene diisocyanate, 1,2-propylene diisocyanate, 1,3-butylene diisocyanate, dodecamethylene diisocyanate and 2,4,4-trimethylhexa It may be at least one selected from the group consisting of methylene diisocyanate (2,4,4-trimethylhexamethylene diisocyanate).

In one embodiment of the present application, the amine-based curing agent for the epoxy resin is hexamethylenediamine, triethyldiamine, polyethyleneimine, hexamethylenetetramine, diethylenetriamine, triethyltetramine, isoformdiamine, diethylene Diethylene Triamine, Triethylene Tetramine, Diethylamino propyl amine, Menthane diamine, N-aminoethylpiperazine, M-Xyl M-xylene diamine, Isophorone diamine, N,N'-di-tert-butylethylenediamine, N,N-di-iso- Propylethylenediamine (N,N-di-iso-propylethylene-diamine), N,N'-diisopropyl-1,3-propanediamine (N,N'-diisopropyl-1,3-propanediamine), and bis( It may be at least one selected from the group consisting of 2,2,6,6-tetramethyl-4-piperidyl) sebacate (bis(2,2,6,6-tetramethyl-4-piperidyl) sebacate).

In one embodiment of the present application, the solvent is N-butyl acetate, acetate, ethyl acetate, amyl acetate, methyl cellosolve acetate, ethyl cellosolve acetate, diethylene glycol methyl acetate, diethylene glycol ethyl acetate, It may be at least one selected from the group consisting of ethylene glycol monoethyl ether acetate, 3-methoxybutyl acetate, and propylene glycol methyl ether acetate (PGMEA).

In one embodiment of the present application, the heat dissipating filler among the thermally conductive particles is alumina, aluminum oxide, magnesium oxide, zinc oxide, silicon carbide, aluminum nitride, boron nitride, silicon nitride, aluminum hydroxide, magnesium hydroxide, boron carbide, and zirconia. , silicon nitride, barium titanate, strontium titanate, beryllium oxide, manganese oxide, zirconia oxide, boron oxide, and may be at least one selected from the group consisting of silicon oxide.

In one embodiment of the present application, the additive may include at least one selected from the group consisting of a matting agent, a colorant, an adhesion promoter, a dispersing agent, an antisettling agent, an antifoaming agent, and a leveling agent.

In one embodiment of the present application, the dispersant is a phosphoric acid ester of polyethoxylated alkylphenol, ethoxylated alkylphenol, ethoxylated castor oil, polyoxyethylene tristyrylphenyl ether, ethoxylated aliphatic alcohol, ethylene oxide/ Propylene oxide block copolymer, sodium salt of lignosulfonic acid, disodium salt of sulfuric acid, sodium salt of acrylic acid polymer, sodium salt of dodecyl sulfate, urea-formaldehyde resin, polyethylene glycol mono(tristyrylphenyl) ether, dodecyl Calcium salt of sylbenzene sulfonic acid, sodium stearate, sorbitan monostearate, polyoxyethylene ester of rosin, polyoxyethylene dodecyl mono ether, polyoxyethylene-polyoxypropylene block copolymer, polyoxyethylene monolaurate, Polyoxyethylene monohexadecyl ether, polyoxyethylene monooleate, polyoxyethylene mono(cis-9-octadecenyl)ether, polyoxyethylene monostearate, polyoxyethylene monooctadecyl ether, polyoxyethylene diolate , Polyoxyethylene Distearate, Polyoxyethylene Sorbitan Monolaurate, Polyoxyethylene Sorbitan Monooleate, Polyoxyethylene Sorbitan Monopalmitate, Polyoxyethylene Sorbitan Monostearate, Polyoxyethylene Sorbitan Tri Oleates, polyoxyethylene sorbitan tristearate, polyglycerol esters of oleic acid, polyoxyethylene sorbitol hexastearate, polyoxyethylene monotetradecyl ether, polyoxyethylene sorbitol hexaoleate, fatty acids, tall-oil, sorbitol hexa It may be at least one selected from the group consisting of esters, ethoxylated castor oil, ethoxylated soybean oil, ethoxylated polyoxyethylene sorbitol tetraoleate, glycerol and polyethylene glycol mixed esters, polyglycerol esters, monoglycerides, and sucrose esters. there is.

In one embodiment of the present application, the adhesion promoter may be epoxy ester phosphate acid.

In one embodiment of the present application, the anti-settling agent may be a urea-based compound.

One embodiment of the present application includes preparing a dispersion by milling the heat dissipating paint composition (S1); and preparing a heat-dissipating paint by adding a diisocyanate-based curing agent or an amine-based curing agent to the dispersion (S2); It provides a method for producing a heat dissipating paint comprising a.

Preparing the dispersion (S1) may include preparing a dispersion mixture by mixing the heat dissipating paint composition (S11); and milling the dispersion mixture to grind and exfoliate graphite and other thermally conductive particles to an optimal size to prepare a uniformly dispersed solution (S12).

In one embodiment of the present application, before preparing the dispersion (S1), ultrasonic treatment of graphite, or dispersion treatment of graphite with an ultra-high pressure disperser, or processing of graphite with a high-speed shear ( S0); may further include.

In one embodiment of the present application, the step (S2) of preparing a heat-dissipating paint by adding a diisocyanate-based curing agent or an amine-based curing agent to the dispersion. It may be a step of uniformly mixing the prepared solution with diisocyanate in case of a urethane binder (S2'), or a step of preparing a heat-dissipating paint composition by mixing with an amine-based curing agent in case of an epoxy binder (S2'').

One embodiment of the present application provides a heat-dissipating coating film formed by applying a heat-dissipating paint composition on a substrate and firing at 70 °C to 100 °C.

One embodiment of the present application provides a heat sink including the heat dissipation coating film.

The heat-dissipating paint composition according to one embodiment of the present application has excellent thermal conductivity and thermal radiation characteristics, excellent adhesion to the coated surface, and durability such as strength and thermal shock of the coating layer for cooling the latest electronic products and LED boards. It is suitable for heat sinks and has the advantage of implementing superior heat dissipation performance compared to existing heat sinks when applied to a metal surface such as aluminum.

The heat-dissipating paint composition according to one embodiment of the present application forms a coating film with excellent adhesion with one coating, prevents peeling from the surface of the heat-dissipating part during use, and maintains high durability against thermal shock and salt spray from the outside. .

The heat dissipation paint composition according to one embodiment of the present application has the advantage of being able to be used for metal surface treatment requiring heat dissipation including various metal heat dissipation parts such as aluminum.

Effects according to the present application are not limited by the contents exemplified above, and various more effects are included in the present specification.

1(a) shows an aluminum plate, and FIG. 1(b) shows an aluminum plate coated with a heat dissipating paint.

2 shows a sample for evaluating heat dissipation performance.

Figure 3 shows the measurement results of the heat dissipation efficiency according to the milling time of the compositions of Examples 1 and 4.

4 shows expanded graphite before milling.

5 shows a SEM picture of expanded graphite after milling for 3 hours.

6 shows a TEM image of expanded graphite after milling for 3 hours.

Advantages and features of the present application, and how to achieve them, will become clear with reference to the embodiments described below in detail. However, the present application is not limited to the embodiments disclosed below and may be implemented in various different forms, but only the present embodiments make the disclosure of the present application complete, and common knowledge in the art to which this application belongs. It is provided to fully inform the person who has the scope of the application, and this application is only defined by the scope of the claims. Like reference numbers designate like elements throughout the specification.

Unless otherwise defined, all terms (including technical and scientific terms) used in this specification may be used in a meaning commonly understood by those of ordinary skill in the art to which this application belongs. In addition, terms defined in commonly used dictionaries are not interpreted ideally or excessively unless explicitly specifically defined.

Terminology used herein is for describing the embodiments and is not intended to limit the present application. In this specification, singular forms also include plural forms unless specifically stated otherwise in a phrase. As used herein, "comprises" and/or "comprising" does not exclude the presence or addition of one or more other elements other than the recited elements.

In this specification, the numerical range represented by "-" means "above" and "below". For example, notation with 2 to 15 mm means 2 mm or more and 15 mm or less.

One embodiment of the present application, in the heat dissipation paint composition, based on the total weight of the composition, 30 to 60% by weight of the binder resin; 10 to 25% by weight of thermally conductive particles; 5 to 15% by weight of additives; and 10 to 50% by weight of a solvent; It provides a heat dissipation paint composition comprising a.

In one embodiment of the present application, the binder resin includes at least one or more of a urethane resin, an epoxy resin, and polyester.

The thermally conductive particles may include at least one graphite selected from the group consisting of expanded graphite, impression graphite, artificial graphite, and earthy graphite. Preferably, it may be expanded graphite.

The expanded graphite may be exfoliated into graphene nanoplates (GNPs) or graphene through various processes such as milling, ultra-high pressure dispersion, and ultrasonic waves. GNP refers to a state composed of hundreds of graphene layers by exfoliation between graphene layers constituting graphite. Expanded graphite is easily separated between layers when an external force is applied due to the widening of the space between the graphene layers of the graphite, and as a result, a certain portion of graphene and GNP are generated. In the present invention, the expanded graphite is pre-exfoliated using an ultra-high pressure disperser or ultrasonic waves, and then mixed with a binder, other particles and additives, and treated in a mixing-milling process to produce a heat-dissipating paint, and without a separate pre-treatment and exfoliation process, the binder, etc. It was confirmed that peeling could occur only through the milling process after mixing with other components. In the milling process, the milling speed and the size of zirconia (ZrO _{2 )} used as milling beads affect exfoliation. The diameter of zirconia is preferably 0.05 mm to 3.0 mm. Further, the diameter of zirconia is more preferably 0.1 to 2.0 mm. In the case of milling beads having a size of 0.1 to 2.0 mm, the graphite exfoliation effect is excellent even after milling for 2 to 4 hours.

In one embodiment of the present application, the graphite is obtained by exfoliating the graphite by wet milling for 1 hour to 6 hours, specifically for 2 hours to 6 hours, more specifically for 2 hours to 5 hours, and after milling the graphite The diameter of the particles may be between 0.1 μm and 50 μm. In the present invention, it was confirmed that expanded graphite having a diameter of 3 μm to 100 μm was crushed and exfoliated to a size of 0.1 μm to 50 μm after milling for 2 to 4 hours. Compared to expanded graphite, natural graphite such as impression graphite and earth graphite can shorten the milling time, and even if sufficient milling time is maintained, delamination of graphite does not occur easily, so the heat dissipation efficiency does not change significantly depending on the milling time. However, compared to expanded graphite, natural graphite has advantages in that it is easy to control the viscosity of paint and has excellent productivity.

In one embodiment of the present application, the composition may be mixed by adding a diisocyanate-based curing agent or an amine-based curing agent after the milling.

In one embodiment of the present application, the expanded graphite may be graphite in which interlayer expansion is performed by heat treatment after acid treatment.

The heat-dissipating paint composition may have a viscosity of 300 cps or more to 1500 cps or less at 25° C., and may have a viscosity of 600 cps or more and 800 cps or less. When the viscosity is within the above range, it may be more advantageous in terms of the sedimentation rate of the thermally conductive particles and the stability of the dispersion process. If it is less than 300 cps, it may be difficult to create a heat-dissipating coating film due to flow of the composition, etc., and even after creation, the adhesive force with the coated surface may be weakened, and if it exceeds 1500 cps, it is difficult to manufacture a thin heat-dissipating coating film. Even if it is, the surface may not be uniform, and the coating process may not be easy, especially in the case of spray-type coating, the coating process may be more difficult. In addition, the dispersibility of the heat-dissipating filler in the heat-dissipating coating film may decrease.

The composition may further include a curing catalyst that is dibutyltin dilaurate, ethylene glycol, propylene glycol, diethylene glycol, 1,3-butanediol, 1,4-butanediol, neopentyl glycol, 3-methyl-1 ,5-pentanediol, 2-butyl-2-ethyl-1,3-propanediol, 2,4-diethyl-1,5-pentanediol, 1,2-hexanediol, 1,6-hexanediol, 1 consisting of 8-octanediol, 1,9-nonanediol, 2-methyl-1,8-octanediol, 1,8-decanediol, octanedecanediol, glycerin, trimethylolpropane, pentaerythritol and hexanetriol A spacer selected from the group; may further include.

The thermally conductive particles may include metal particles. The metal particles may be at least one selected from the group consisting of aluminum, iron, copper, zinc, tin, titanium, nickel, antimony, magnesium, vanadium, chromium, and zirconium. The metal particles, specifically aluminum powder, can use flake-type particles with a diameter of 5 to 40 μm, and in addition to heat dissipation properties, they can produce a pearl effect on the coating film and help to strengthen the surface of the coating film. there is.

The thermally conductive particles may further include at least one carbon selected from the group consisting of carbon black, single-walled carbon nanotubes, multi-walled carbon nanotubes, graphene, and carbon fibers.

Carbon nanotubes are a modified form of graphene, and include single-wall carbon nanotubes (SWCNTs), in which a single layer of graphene is rolled into a tube, and multi-wall carbon nanotubes composed of several layers. (Multi-wall carbon nanotubes, MWCNTs). Carbon nanotubes have excellent mechanical properties and have a very high aspect ratio (length/diameter), so they have excellent tensile stress and excellent thermal conductivity, so their application range is diverse. In addition, it has the properties of a conductor or a semiconductor depending on its winding shape, its energy gap varies according to its diameter, and it has a quasi-one-dimensional structure, so it exhibits a unique quantum effect. The most important thermal property of carbon nanotubes is that the thermal conductivity at room temperature is very high at ~6,600 W/m·K, and it has been theoretically proven that this is due to the very large mean free path of phonons. MWCNTs can also give a thermal bridge effect between graphite or GNPs produced during milling, and graphene particles.

Graphene is a material with an atom-sized honeycomb structure made of carbon atoms. It is 0.2 nm thick, has very high physical and chemical stability, conducts electricity more than 100 times better than copper, and has electron mobility more than 100 times faster than silicon. . In addition, its strength is more than 200 times stronger than steel, its thermal conductivity is more than twice as high as that of diamond, which has the highest thermal conductivity, and it transmits most of the light, so it is transparent and has excellent elasticity.

When carbon fiber has a strength of 10 to 20 g/d and a specific gravity of 1.5 to 2.1, it has excellent heat resistance and impact resistance, is strong against chemicals, and has high resistance to pests. During the heating process, molecules such as oxygen, hydrogen, nitrogen, etc. escape and the weight is reduced, so it is lighter than metal (aluminum), but has excellent elasticity and strength compared to metal (iron). Due to these characteristics, sports goods (fishing rods, golf clubs, tennis rackets), aerospace industry (heat-resistant materials, aircraft fuselages), automobiles, civil engineering (lightweight materials, interior materials), electrical and electronics, telecommunications (antennas), and environmental industries (air purifiers) , water purifier) and is widely used as a high-performance industrial material in each field.

When the carbon material dispersion formed of such a carbon material is mixed with the graphite material, the carbon material such as carbon nanotubes contained in the carbon material dispersion is connected between the particles of the graphite material to improve thermal conductivity and exhibit excellent heat dissipation performance. be able to

The particle size of the carbon material may be preferably 200 nm to 1 μm. When the particle size of the carbon material is less than 200 nm, aggregation is likely to occur, and when the particle size exceeds 1 μm, it may be difficult to prepare a uniform dispersion of the carbon material in a state in which aggregation has already occurred. The amount of carbon may be 1% to 5% by weight in the heat dissipating paint composition.

If the carbon is less than 1% by weight in the heat dissipation paint composition, it is difficult to see the effect of thermal radiation due to a too small amount, and if it is more than 5% by weight, the aggregation of the fillers of heat dissipation characteristics increases, so that in the heat dissipation paint composition Acidity may be lowered, and adhesive strength may be lowered. The graphite and the carbon material may have a weight ratio of 1:1 to 10:1 in the filler.

The thermally conductive particles may further include a heat dissipating filler.

The heat dissipating filler may include alumina, aluminum oxide (Al ₂ O ₃ ), magnesium oxide, zinc oxide, silicon carbide (SiC), aluminum nitride, boron nitride, silicon nitride, aluminum hydroxide, magnesium hydroxide, zirconia ( zirconia (ZrO ₂ ), boron carbide (B ₄ C), silicon nitride (Si ₃ N ₄ ), barium titanate, strontium titanate, beryllium oxide, manganese oxide, zirconia oxide, boron oxide and silicon oxide It may be at least one or more selected from the group consisting of.

The heat dissipating filler may have an average particle diameter of 1 μm to 10 μm. If it exceeds the above range, the adhesion to the substrate is reduced, and workability may be deteriorated.

The heat dissipating filler may be selected without limitation as long as it has insulation and heat dissipation properties at the same time in its material. In addition, the shape and size of the heat dissipating filler are not limited, and may be porous or non-porous in structure, and may be selected differently depending on the purpose.

However, preferably, it is possible to achieve excellent insulation and heat dissipation performance, easy formation of a heat dissipation coating film, uniform insulation and heat dissipation performance after forming the heat dissipation coating film, and surface quality of the heat dissipation coating film.

In addition, in the case of the heat-radiating filler, a filler whose surface is modified with a functional group such as a silane group, an amino group, an amine group, a hydroxyl group, or a carboxyl group may be used. In this case, the functional group may be directly bonded to the surface of the filler, or carbon number It may be indirectly bonded to the filler via a substituted or unsubstituted aliphatic hydrocarbon having 1 to 20 atoms or a substituted or unsubstituted aromatic hydrocarbon having 6 to 14 carbon atoms.

In addition, the heat-dissipating filler may be a core-shell type filler in which a known conductive heat-dissipating filler such as carbon-based or metal is used as a core and an insulating component surrounds the core.

In heat-dissipating paints, the binder determines the thermal and mechanical strength of the coating film, so it can be selected according to the purpose. Urethane resin binders have the advantage of being able to design from thin films with high strength and heat resistance to flexible and elastic thin films.

The urethane resin may be a polyol. The polyols include acrylic polyol, caprolactone polyol, epoxy polyol, ester polyol, ether polyol, polycarbonate polyol, polyethylene glycol, polypropylene glycol, polytetramethylene glycol, ethylene glycol, diethylene glycol, 1,3-butanediol, 1 ,4-butanediol, neopentylglycol, 3-methyl-1,5-pentanediol, 2-butyl-2-ethyl-1,3-propanediol, 2,4-diethyl-1,5-pentanediol, 1 ,2-hexanediol, 1,6-hexanediol, 1,8-octanediol, 1,9-nonanediol, 2-methyl-1,8-octanediol, 1,8-decanediol, octanedecanediol, glycerin , It may be at least one selected from the group consisting of trimethylolpropane, pentaerythritol, hexanetriol, and polypropylene glycol. More specifically, it may be an acrylic polyol, a lactone polyol, an ester polyol or a mixture thereof.

The polyether polyol is water, low molecular weight polyol (propylene glycol, ethylene glycol, glycerin, trimethylolpropane, pentaerythritol, etc.), bisphenols (bisphenol A, etc.), dihydroxybenzene (catechol, resorcin, hydroquinone, etc.) etc.) as an initiator, obtained by addition polymerization of an alkylene oxide selected from ethylene oxide, propylene oxide or butylene oxide. Specific examples include polyethylene glycol, polypropylene glycol, and polytetramethylene glycol.

The polycaprolactone polyol is a caprolactone-based polyester diol obtained by ring-opening polymerization of cyclic ester monomers such as ε-caprolactone or σ-valerolactone. An example thereof is a polycarbonate polyol obtained by polycondensation of the polyol component and phosgene, the polyol component and dimethyl carbonate, diethyl carbonate, dipropyl carbonate, diisopropyl carbonate, dibutyl carbonate, ethyl butyl carbonate, ethylene carbide Polycarbonate polyols obtained by transesterification and condensation of diester carbonates such as bonate, propylene carbonate, diphenyl carbonate or dibenzyl carbonate, copolymer polycarbonate polyols obtained by using two or more of the above polyol components in combination, and various polycarbonates described above polycarbonate polyols obtained by esterification of carbonate polyols and carboxyl group-containing compounds, polycarbonate polyols obtained by etherification of the various polycarbonate polyols and hydroxyl group-containing compounds; polycarbonate polyols obtained by subjecting the various polycarbonate polyols and ester compounds to a transesterification reaction; polycarbonate polyols obtained by subjecting the various polycarbonate polyols and hydroxyl group-containing compounds to a transesterification reaction; Polyester-based polycarbonate polyols obtained by polycondensation of the various polycarbonate polyols and dicarboxylic acid compounds; and copolymerized polyether-based polycarbonate polyols obtained by copolymerizing the various polycarbonate polyols with alkylene oxide. Even in the case of a polyfunctional polyol, any polymer having a hydroxyl group capable of forming a main chain of a polyurethane compound may be used without limitation. Due to the polyol component, excellent reworkability characteristics such as residue reduction can be expressed.

Considering the use of heat dissipation for electronic products such as displays and aluminum heat sinks, it has excellent adhesion with metal interfaces and has excellent hardness and thermal shock resistance to match the characteristics of heat sinks that are repeatedly subjected to temperature rise and cooling depending on whether or not electronic products are used. polyol was selected. Polyester polyol, which is widely used in polyurethane production, exhibits a disadvantage in that adhesion to a metal interface is poor when used alone, and as a result, it is weak against thermal shock. Therefore, when considering interfacial adhesion, impact resistance, hardness, and curing characteristics, a three-component polyol may be used by mixing acrylic polyol and polyester polyol or adding polylactone polyol to further improve adhesion and impact resistance. The type and mixing ratio of resin can be variously selected in consideration of strength, hardness, and heat resistance (Tg) according to the requirements of the properties of the coating film.

The diisocyanate-based curing agent is preferably a polyfunctional aliphatic isocyanate compound. When an aromatic isocyanate compound or an alicyclic isocyanate compound is used, it hardens within 1 hour, so if sufficient time is not secured for heat dissipation coating, there is a problem in that usability is deteriorated. Since the aliphatic isocyanate compound has low reactivity, it does not harden for more than 6 hours, so the usability of the paint is improved. In addition, there is an advantage that the curing temperature can be fired within 15 minutes to 1 hour, 20 minutes to 40 minutes at 70 ° C to 100 ° C, 75 ° C to 90 ° C. In the case of a heat-dissipating paint composition used for electronic parts, it is preferable that the firing temperature of the heat-dissipating paint is within 100 degrees Celsius because problems may occur in electronic parts when the firing temperature exceeds 100 °C.

The diisocyanate-based curing agent, specifically, hexamethylene diisocyanate (HDI), trimethylene diisocyanate, tetramethylene diisocyanate, 1,2-propylene diisocyanate (1,2 - Propylene diisocyanate), 1,3-butylene diisocyanate, dodecamethylene diisocyanate and 2,4,4-trimethylhexamethylene diisocyanate (2,4,4-trimethylhexamethylene diisocyanate), but is not limited thereto.

The composition includes ethylene glycol, propylene glycol, diethylene glycol, 1,3-butanediol, 1,4-butanediol, neopentyl glycol, 3-methyl-1,5-pentanediol, 2-butyl-2-ethyl-1, 3-propanediol, 2,4-diethyl-1,5-pentanediol, 1,2-hexanediol, 1,6-hexanediol, 1,8-octanediol, 1,9-nonanediol, 2-methyl A spacer selected from the group consisting of -1,8-octanediol, 1,8-decanediol, octanedecanediol, glycerin, trimethylolpropane, pentaerythritol, and hexanetriol may be used. It is possible to control the length of the urethane chain and the crosslink density after curing by using a spacer.

The composition may use a curing catalyst that is dibutyl tin dilaurate.

The epoxy resin is not particularly limited as long as it exhibits a curing and bonding action, but as a solid or close-to-solid epoxy, an epoxy resin having one or more functional groups is preferred.

The epoxy resin is a bisphenol-based epoxy, a phenol novolac-based epoxy, an o-cresol novolac-based epoxy, a multifunctional epoxy, an amine-based epoxy, a heterocyclic epoxy, a substituted epoxy, a naphthol-based epoxy Epoxy can be exemplified, and more specifically, as an example of an epoxy-type compound, a bisphenol A epoxy resin and an epichlorhydrin-type epoxy resin. Ethylene glycol glycidyl ether, polyethylene glycol diglycidyl ether, glycerin diglycidyl ether, glycerin triglycidyl ether, 1,6-hexanediol diglycidyl ether, trimethylolpropane triglycidyl ether, diglycidyl Cidylaniline, diglycidylamine, N,N,N',N'-tetraglycidyl-m-xylenediamine and 1,3-bis(N,N'-diglycidylaminemethyl)cyclohexane It may be at least one or more selected from the group consisting of.

As bisphenol-based products currently on the market, Epicoat 807, Epicoat 815, Epicoat 825, Epicoat 827, Epicoat 828, Epicoat 834, Chepicoat 1001, Epicoat 1004, Epicoat 1007, Epicoat 1009, Dow Chemical's DER-330, DER-301, DER-361, Daenippon Ink Chemical's Epiclone 830-S, Epiclone EXA-830CRP, Epiclone EXA 850-S, Epiclone EXA-850CRP, Epiclone There are clone EXA-835LV, Kukdo Chemical's YD-011, YD-012, YD-014, YD-128, YD-134, YDF-170, etc., and as a phenol novolac system, Yuka Shell Epoxy Co., Ltd. There are Picot 152, Epicoat 154, EPPN-201 of Nippon Explosives Co., Ltd., DN-483 of Dow Chemical, etc., and as o-Cresol novolac, Daenippon Ink Chemical's Epiclone N-665-EXP, Kukdo Chemical YDCN-500-1P, YDCN-500-2P, YDCN-500-4P, YDCN-500-5P, YDCN-500-7P, YDCN-500-8P, YDCN-500-10P, YDCN-500-80P, YDCN-500-90P, EOCN-102S, EOCN-103S, EOCN-104S, EOCN-1012, EOCN-1025, EOCN-1027 of Nippon Explosive Co., Ltd., YDCN-701, YDCN-702, YDCN-703 of Dokdo Chemical Co., Ltd. There are YDCN-704 and the like, and examples of the multifunctional epoxy resin include Epon 1031S from Yuka Shell Epoxy Co., Ltd., Araldite 0163 from Ciba Specialty Chemicals Co., Ltd., Detacol EX-611 from Naga Celsius Chemical Co., Ltd., Detacol EX-614, and Detacol. Detacol EX-614B, Detacol EX-622, Detacol EX-512, Detacol EX-521, Detacol EX-421, Detacol EX-411, Detacol EX-321, etc. Sumitomo Chemical Co., Ltd.'s ELM-120, Yukashell Epoxy Co., Ltd. Epicoat 604, There are YH-434 of Dokdo Chemical Co., Ltd., TETRAD-X and TETRAD-C of Mitsubishi Gas Chemical Co., Ltd., PT-810 of Civas Specialty Chemical Co., Ltd. as a heterocyclic epoxy resin, and ERL- of UCC as a substitution type epoxy. 4234, ERL-4299, ERL-4221, ERL-4206, and naphthol-based epoxies include Epiclone HP-4032, Epiclone HP-4032D, Epiclone HP-4700, and Epiclone 4701 of Daenippon Ink Chemicals. , These can be used individually or in mixture of two or more types.

Examples of the amine-based curing agent include hexamethylenediamine, triethyldiamine, polyethyleneimine, hexamethylenetetramine, diethylenetriamine, triethyltetramine, isoformdiamine, diethylenetriamine, and triethylenetetramine. (Triethylene Tetramine), Diethylamino propyl amine, Menthane diamine, N-aminoethylpiperazine, M-xylene diamine, Isophorone diamine (Isophorone diamine), N,N'-di-tert-butylethylenediamine (N,N'-di-tert-butylethylenediamine), N,N-di-iso-propylethylenediamine (N,N-di-iso- propylethylene-diamine), N,N'-diisopropyl-1,3-propanediamine, and bis(2,2,6,6-tetramethyl-4 -It may be at least one selected from the group consisting of piperidyl) sebacate (bis(2,2,6,6-tetramethyl-4-piperidyl)sebacate).

In addition, since the solvent may be selected according to the selected binder resin, curing agent, etc., this is not particularly limited in the present invention, and any solvent capable of properly dissolving each component may be used as the solvent. The solvent may specifically use an organic solvent, and more specifically, N-butyl acetate, acetate, ethyl acetate, amyl acetate, methyl cellosolve acetate, ethyl cellosolve acetate, diethylene glycol methyl acetate, diethylene glycol At least one selected from the group consisting of ethyl acetate, ethylene glycol monoethyl ether acetate, 3-methoxybutyl acetate, and propylene glycol methyl ether acetate (PGMEA) may be used.

The higher the added amount of the solvent, the lower the viscosity and the faster the sedimentation rate of the particles. The smaller the added amount of the solvent, the higher the viscosity but may decrease stability in the dispersion process. The solvent may be 10% to 50% by weight of the heat dissipating paint composition. If the solvent is less than 10% by weight of the heat-dissipating paint composition, the resin does not dissolve well, dispersibility is poor, and the viscosity increases, and if the solvent is greater than 50% by weight, the heat-dissipating paint composition is coated on a substrate Gaps may be formed, and the heat dissipation effect may be reduced.

In the case of spray coating, the viscosity can be adjusted by adding a similar amount of the solvent to the resin.

For example, the weight ratio of the resin to the solvent may be 1:1. The content of the solvent can be adjusted according to the condition of the spray coater. In the case of bar coating or gravure coating, it may contain less than spray coating, as the viscosity should be slightly higher.

The solvent may be volatilized after coating the heat-dissipating paint composition on a substrate, and the heat-dissipating paint composition may be solvent-free after coating and drying. After coating the heat dissipating paint composition on a substrate for heat dissipation, the solvent included in the heat dissipating paint composition may be volatilized and thus the solvent component may not be present.

The composition may further include at least one selected from the group consisting of a matting agent, a colorant, an adhesion promoter, a dispersing agent, an antisettling agent, an antifoaming agent, and a leveling agent as an additive.

The matting agent is at least one selected from the group consisting of titanium dioxide, airgel silica, hydrogel silica, PP wax, PE wax, PTFE wax, urea formaldehyde resin and benzoguamine formaldehyde resin, preferably titanium dioxide can include The matting agent may be spherical particles having a diameter of 1.0 to 10.0 μm. The matting agent may be included in 2 to 5% by weight based on the total weight of the composition.

The colorant may include at least one selected from the group consisting of talc, zinc oxide, zinc sulfide, metal oxide, hydroxyl, sulfide, azo, nitro, and phthalocyanine, preferably talc. Talc, which can be used as the colorant, and titanium dioxide, which can be used as the matting agent, can be used together with the heat radiation filler as a filler to improve withstand voltage characteristics.

Meanwhile, the above-described heat-dissipating paint composition may further include a dispersant and a solvent for improving the dispersibility of the heat-dissipating filler and realizing a uniform heat-dissipating coating film.

The antifoaming agent prevents the generation and retention of air bubbles during mixing of each composition and prevents the generation of air bubbles or craters on the surface of a coating film.

The leveling agent may improve the uniformity of the coating film and reduce surface roughness.

In addition, the heat-dissipating paint composition described above is a pH adjuster, an ion trapping agent, a viscosity modifier, a thixotropy imparting agent, an antioxidant, a heat stabilizer, a light stabilizer, an ultraviolet absorber, a colorant, a dehydrating agent, a flame retardant, an antistatic agent, and an antimold. One type or two or more types of various additives such as antiseptics, preservatives, 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.

On the other hand, the above-described heat-dissipating paint composition may further include an antioxidant for preventing discoloration of the coated dry film, brittleness due to oxidation, and deterioration of physical properties such as adhesion strength.

The antioxidant may be a known component employed in the art as an antioxidant of a heat-dissipating paint composition. For example, the antioxidant is tri-methylphosphate, tri-phenylphosphate, tris(2,4-di-tert-butylphenyl)phosphate, triethylene glycol-bis-3-(3-tert-butyl-4-hydride) Roxy-5-methylphenyl)propionate, 1,6-hexane-diol-3(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, pentaerythrityl-tetrakis(3- (3,5-di-tert-butyl-4-hydroxyphenyl)propionate, 2-hydroxybenzophenone, 2-hydroxyphenylbenzothiazole, hindered amine, organic nickel compound, salicylate, cinnamate derivatives, resorcinol monobenzoate, oxanilide, and p-hydroxybenzoate may include at least one selected from the group consisting of 2-hydroxyphenylbenzothia can be sleepy

In addition, the antioxidant may preferably be included in an amount of 0.1 to 3% by weight based on the total weight of the composition. If the antioxidant is provided in less than 0.1 parts by weight, discoloration may occur, and if the antioxidant is provided in more than 3 parts by weight, brittleness and adhesive strength may be weakened.

The adhesion promoter may be epoxy ester phosphate acid. The adhesion enhancer improves the interfacial adhesion between the coating film and the adherend, and prevents peeling and cracking of the coating film even during thermal shock and long-term use. The adhesion promoter may be included in an amount of 3 to 10% by weight based on the total weight of the composition.

The dispersant may be included in an amount of 0.5 to 1.5% by weight based on the total weight of the composition. If it is provided in less than 0.5% by weight, the desired effect may not be expressed, and if the dispersant is provided in excess of 1.5% by weight, the adhesion strength of the adherend is weakened or pinholes and orange peel are formed on the surface of the coating film. (Orange Peel) may occur.

The dispersant may be included to increase the dispersibility of the heat dissipating paint composition, to make the density even, and to appropriately adjust the rheology control.

The dispersant may be a nonionic surfactant, and cationic surfactants, anionic surfactants, and amphoteric surfactants may be used. Since the polyol has a surfactant effect, a surfactant may not be used, but a nonionic surfactant may be preferably used. When the heat-dissipating paint composition of the present application is stored for 4 weeks or more, the effect of improving the storage stability of the nonionic surfactant is more excellent.

The nonionic surfactant is, for example, polyethoxylated alkylphenol phosphoric acid ester, ethoxylated alkylphenol, sulfuric acid ester, ethoxylated castor oil, polyoxyethylene tristyrylphenyl ether, ethoxylated aliphatic alcohol, ethylene oxide / Propylene oxide block copolymer, sodium salt of lignosulfonic acid, disodium salt of sulfuric acid, sodium salt of acrylic acid polymer, sodium salt of dodecyl sulfate, urea-formaldehyde resin, polyethylene glycol mono(tristyrylphenyl) ether, Calcium salt of dodecylbenzene sulfonic acid, sodium stearate, sorbitan monostearate, polyoxyethylene esters of rosin, polyoxyethylene dodecyl monoether, polyoxyethylene-polyoxypropylene block copolymer, polyoxyethylene monolaurate , polyoxyethylene monohexadecyl ether, polyoxyethylene monooleate, polyoxyethylene mono(cis-9-octadecenyl)ether, polyoxyethylene monostearate, polyoxyethylene monooctadecyl ether, polyoxyethylene diol Late, Polyoxyethylene Distearate, Polyoxyethylene Sorbitan Monolaurate, Polyoxyethylene Sorbitan Monooleate, Polyoxyethylene Sorbitan Monopalmitate, Polyoxyethylene Sorbitan Monostearate, Polyoxyethylene Sorbitan Trioleate, polyoxyethylene sorbitan tristearate, polyglycerol esters of oleic acid, polyoxyethylene sorbitol hexastearate, polyoxyethylene monotetradecyl ether, polyoxyethylene sorbitol hexaoleate, fatty acids, tall-oil, sorbitol At least one selected from the group consisting of hexaesters, ethoxylated castor oil, ethoxylated soybean oil, ethoxylated polyoxyethylene sorbitol tetraoleate, glycerol and polyethylene glycol mixed esters, polyglycerol esters, monoglycerides and sucrose esters can

The anionic surfactant is potassium laurate, triethanolamine stearate, sodium lauryl sulfate, sodium dodecyl sulfate, alkyl polyoxyethylene sulfate, sodium alginate, dioctyl sodium sulfosuccinate, phosphatidyl glycerol, phosphatidyl Inositol, phosphatidylserine, phosphatidic acid and salts thereof, glyceryl esters, sodium carboxymethylcellulose, bile acids and salts thereof, cholic acid, deoxycholic acid, glycocholic acid, taurocholic acid, glycodeoxycholic acid, alkyl sulfonates, aryl sulfos nates, alkyl phosphates, alkyl phosphonates, stearic acid and salts thereof, calcium stearate, phosphates, sodium carboxymethylcellulose, dioctylsulfosuccinate, dialkyl esters of sodium sulfosuccinic acid, phospholipids and calcium carboxymethylcellulose It may be selected from.

Such cationic surfactants include, but are not limited to, quaternary ammonium compounds, benzalkonium chloride, cetyltrimethylammonium bromide, chitosan, lauryldimethylbenzylammonium chloride, acyl carnitine hydrochloride, alkylpyridinium halide, cetyl pyridinium chloride , cationic lipid, polymethyl methacrylate trimethylammonium bromide, sulfonium compound, polyvinylpyrrolidone-2-dimethylaminoethyl methacrylate dimethyl sulfate, hexadecyltrimethyl ammonium bromide, phosphonium compound, benzyl-di( 2-Chloroethyl)ethylammonium Bromide, Coconut Trimethyl Ammonium Chloride, Coconut Trimethyl Ammonium Bromide, Coconut Methyl Dihydroxyethyl Ammonium Chloride, Coconut Methyl Dihydroxyethyl Ammonium Bromide, Decyl Triethyl Ammonium Chloride, Decyl Dimethyl Hydroxyethyl Ammonium Chloride bromide, C ₁₂ -C ₁₅ dimethyl hydroxyethylammonium chloride, C ₁₂ -C ₁₅ dimethylhydroxyethyl ammonium chloride bromide, coconut dimethyl hydroxyethyl ammonium chloride, coconut dimethyl hydroxyethyl ammonium bromide, myristyl trimethyl ammonium methylsulfate , lauryl dimethyl benzyl ammonium chloride, lauryl dimethyl benzyl ammonium bromide, lauryl dimethyl (ethenoxy) tetra ammonium chloride, lauryl dimethyl (ethenoxy) tetra ammonium bromide, N-alkyl (C ₁₂ - ₁₈ ) dimethylbenzyl Ammonium chloride, N-alkyl (C ₁₄ -C ₁₈ )dimethyl-benzyl ammonium chloride, N-tetradecyldimethylbenzyl ammonium chloride monohydrate, dimethyl didecyl ammonium chloride, N-alkyl and (C ₁₂ -C ₁₄ )dimethyl 1- naphthylmethyl ammonium chloride, trimethylammonium halide alkyl-trimethylammonium salt, dialkyl-dimethylammonium salt, lauryl trimethyl ammonium chloride, ethoxylated alkylamidoalkyldialkylammonium salt, ethoxylated trialkyl ammonium salt, dialkylbenzene di Alkylammonium chloride, N-didecyldimethyl ammonium chloride, N-tetradecyldimethylbenzyl ammonium chloride monohydrate, N-alkyl (C ₁₂ -C ₁₄ ) Dimethyl 1-naphthylmethyl ammonium chloride, dodecyldimethylbenzyl ammonium chloride, dialkyl benzenealkyl ammonium chloride, lauryl trimethyl ammonium chloride, alkylbenzyl methyl ammonium chloride, alkyl benzyl dimethyl ammonium bromide, C ₁₂ trimethyl ammonium bromide, C ₁₅ trimethyl ammonium bromide, C ₁₇ trimethyl ammonium bromide, dodecylbenzyl triethyl ammonium chloride, polydiallyldimethylammonium chloride, dimethyl ammonium chloride, alkyldimethylammonium halogenide, tricetyl methyl ammonium chloride, decyltrimethylammonium bromide , dodecyltriethylammonium bromide, tetradecyltrimethylammonium bromide, methyl trioctylammonium chloride, POLYQUAT 10, tetrabutylammonium bromide, benzyl trimethylammonium bromide, choline ester, benzalkonium chloride, stearalkonium chloride, Cetyl pyridinium bromide, cetyl pyridinium chloride, halide salt of quaternized polyoxyethylalkylamine, "MIRAPOL" (Polyquaternium-2) "Alkaquat" (alkyl dimethyl benzylammonium chloride, manufactured by Rhodia), alkyl pyridinium salts, amines, amine salts, imide azolinium salts, protonated quaternary acrylamides, methylated quaternary polymers, and cationic guar gum. benzalkonium chloride, dodecyl trimethyl ammonium bromide, triethanolamine and poloxamine.

Zwitterionic surfactants are electrically neutral but possess local positive and negative charges within the same molecule. Suitable zwitterionic surfactants include, but are not limited to, zwitterionic phospholipids. Suitable phospholipids include phosphatidylcholine, phosphatidylethanolamine, diacyl-glycero-phosphoethanolamine (e.g. dimyristoyl-glycero-phosphoethanolamine (DMPE), dipalmitoyl-glycero-phosphoethanolamine ( DPPE), distearoyl-glycero-phosphoethanolamine (DSPE) and dioleolyl-glycero-phosphoethanolamine (DOPE) Phospholipid mixtures comprising anionic and zwitterionic phospholipids are Such mixtures include, but are not limited to, lysophospholipids, egg or soybean phospholipids, or any combination thereof.

The dispersant may be included to increase the dispersibility of the heat dissipating paint composition, to make the density even, and to appropriately adjust the rheology control.

The dispersant may be 0.5% to 1.5% by weight of the heat dissipating paint composition. When the dispersant is less than 0.5% by weight in the heat dissipating paint composition, the filler is not well dispersed, and thus aggregation may increase.

The anti-settling agent controls the flowability of the composition and serves to prevent or slow down the sedimentation and caking phenomena of the particles. The anti-settling agent may use a urea-based compound or an amide-based compound, and may prevent sedimentation of thermally conductive particles having a high specific gravity.

The heat-dissipating paint composition includes an anti-settling agent dispersed in the binder resin, and in this case, the anti-settling agent may be included in an amount of 0.5 to 1% by weight based on the total weight of the composition.

One embodiment of the present application includes preparing a dispersion by milling the heat dissipating paint composition (S1); and preparing a heat-dissipating paint by adding a diisocyanate-based curing agent or an amine-based curing agent to the dispersion (S2); It provides a method for producing a heat dissipating paint comprising a.

Preparing the dispersion (S1) may include mixing the heat dissipating paint composition to prepare a dispersion mixture (S11). The composition may be put into a stirrer and stirred for 5 minutes to 6 hours at a speed of, for example, 50 rpm to 1500 rpm. If the stirring time is too short, it is difficult to achieve uniform mixing, and even if the stirring time is too long, it is difficult to expect a more uniform mixing effect.

In the step of preparing the dispersion (S1), after the step of preparing the dispersion mixture (S11), the dispersion mixture is milled to pulverize and exfoliate graphite and other thermally conductive particles to an optimal size to obtain a uniformly dispersed solution. Manufacturing step (S12); may include. The milling may be performed by at least one method selected from the group consisting of ultrasonic, roll milling, ball milling, jet milling, screw mixing, attrition milling, bead milling, basket milling, co-rotational mixing, and super mill.

Prior to preparing the dispersion (S1), ultrasonic treatment of graphite, dispersing treatment of graphite with an ultra-high pressure disperser, or processing of graphite with a high-speed shear (S0) may be further included. .

One embodiment of the present application provides a heat-dissipating coating film formed by applying a heat-dissipating paint composition on a substrate and firing at 70 ° C to 120 ° C, preferably 70 ° C to 100 ° C, for 30 minutes to 6 hours.

The application may use various methods including at least one selected from the group consisting of spray coating, inkjet printing, roll printing, dipping coating, comma coating, gravure coating, roll-to-roll and bar coating. can Since the thickness of the coating can be used as a heat sink for a light emitting diode or a printed circuit board as well as a heat sink for a high-power device, in consideration of this, it is formed to a thickness of 10 μm to 50 μm, more specifically, 20 μm to 40 μm. can If the thickness is more than the above, there is a possibility of cost increase and cracking, and if it is less than that, good heat dissipation performance cannot be exhibited.

When the coating of the heat-dissipating paint composition is formed on the substrate, it is thermally cured so that the solvent is volatilized (or evaporated) and the heat-dissipating ink composition is cured.

The substrate can be used without limitation for various metal materials such as aluminum and copper, as well as glass and plastic, and has excellent heat dissipation and adhesion, as well as excellent hardness, solvent resistance and water resistance.

The drying may be performed at a temperature higher than the temperature at which the solvent volatilizes (or evaporates) and lower than the melting temperature of the substrate. For example, it may be performed at a temperature of 70° C. to 120° C. for 30 minutes to 6 hours. If the thermal curing time is too short, it is difficult to completely remove the solvent, and if the thermal curing time is too long, it may be difficult to expect a further thermal curing effect.

The heat-dissipating paint prepared by the heat-dissipating material manufacturing method can emit heat effectively, has a fast heat release rate and high heat emissivity, and emits light by being coated with a heat-dissipating paint composition having excellent adhesion to a three-dimensional substrate. It is very effective in dissipating heat generated from diodes or printed circuit boards.

One embodiment of the present application includes a heat-dissipating circuit board including a heat-dissipating coating film cured by treating at least a portion of an outer surface of the circuit board on which elements are mounted with the heat-dissipating paint composition according to the present application.

The element may be a known element mounted on a circuit board in an electronic device such as a driving chip. In addition, the substrate may be a known circuit board provided in an electronic device, and may be, for example, a PCB or FPCB. Since the size and thickness of the substrate can be changed according to the internal design of the electronic device to be implemented, the present application is not particularly limited thereto.

The present application includes a heat dissipation part for lighting including a heat dissipation coating film cured by treating at least a portion of an outer surface of the heat dissipation paint composition according to the present application.

The heat dissipation component for lighting may be a heat dissipation heat sink for lighting. Specifically, the heat dissipation heat sink for lighting may include a heat sink and a heat dissipation coating layer formed on at least a part or all of an outer surface of the heat sink.

The heat sink may be a known heat sink provided in lighting. Since the material, size, thickness, and shape of the heat sink can be changed according to the purpose, shape, and internal design of lighting to be realized, the present application is not particularly limited thereto.

On the other hand, the heat dissipation paint composition according to the present application is an electronic device component including mobile devices, TVs, wearable devices and flexible devices, LED lamps, ECU (electronic control unit), EV, in addition to the above-described heat dissipation unit, circuit board and lighting parts Automotive parts including batteries and inverters, RF equipment, digital equipment, telecommunications devices including server devices and setup boxes, network devices, solar panels, LEDs and AI/AIN PCBs (Printed Circuit Boards), etc. It can be applied to parts for lighting including devices, lighting cases and sockets. As an example, a heat-dissipating busbar for EV high-voltage switching relays, a heat-dissipating case for EV high-voltage switching relays, a heat-dissipating DC-DC converter for vehicles, It can be applied to automobile parts including at least one selected from the group consisting of automobile engine cooling devices, automobile LED headlamps, and PTC heaters.

The automotive part may be a heat-dissipating bus bar for an EV high-voltage relay including a heat-dissipating coating film cured by treating at least a portion of an outer surface of the heat-dissipating paint composition according to the present application.

The EV high voltage relay busbar may be a known EV high voltage relay busbar commonly used in the art, and the material, size, thickness, and shape of the busbar are the desired input of the EV high voltage relay to be implemented. As the voltage and / or output voltage can be changed according to the internal design in consideration, the present application is not particularly limited thereto.

In addition, the automotive part may be a heat dissipation case for an EV high voltage switching relay including a heat dissipation coating film cured by treating at least a portion of an outer surface of the heat dissipation paint composition according to the present application.

The case for the EV high voltage switching relay may be a case for a known EV high voltage relay commonly used in the art. The EV high voltage switching relay case may include the above-described EV high voltage relay busbar, and the material, size, thickness and shape of the case may be determined by the shape and number of busbars located inside the EV high voltage relay to be implemented. As it is possible to change according to the internal design of the present application is not particularly limited thereto.

In addition, the automotive part may be a heat-dissipating DC-DC converter including a heat-dissipating coating film cured by treating at least a portion of an outer surface of the heat-dissipating paint composition according to the present application.

The DC-DC converter functions to convert DC power of a specific voltage into DC power of another voltage, and may be a known DC-DC converter commonly used in the art. Since the size and shape of the DC-DC converter can be changed according to the internal design of a device to be implemented, the present application is not particularly limited thereto.

In addition, the automotive part may be a heat dissipation engine cooling device including a heat dissipation coating film cured by treating at least a portion of an outer surface of the heat dissipation paint composition according to the present application.

For example, a heat dissipation coating film may be formed on a part of a radiator included in the heat dissipation engine cooling device or, for example, a part or all of the radiator included in the heat dissipation engine cooling device. The radiator may be a known radiator commonly used in the art, and since the material, size and shape of the radiator can be changed according to the internal design of the engine cooling device to be implemented, the present application is specifically limited thereto. I never do that.

In addition, the automotive part may be a heat-dissipating LED headlamp including a heat-dissipating coating film cured by treating at least a portion of an outer surface of the heat-dissipating paint composition according to the present application.

As the heat dissipation coating film is included on at least a portion of the outer surface of the LED head lamp, insulation and heat dissipation characteristics can be remarkably improved and the LED head lamp can be lightweight. The LED headlamp may be a known LED headlamp commonly used in the art, and the material, size and shape of the LED headlamp depend on the design of the vehicle to be implemented and / or the internal design of the LED headlamp. As changes are possible, this application is not particularly limited thereto.

In addition, the automotive part may be a heat-dissipating PTC heater for an electric vehicle including a heat-dissipating coating film cured by treating at least a portion of an outer surface of the heat-dissipating paint composition according to the present application.

The PTC heater may include PTC fins, and as a heat dissipation coating film is formed on some or all of the PTC fins, heat dissipation efficiency may be improved and power consumption of the electric vehicle may be reduced. The PTC pin is in the art

It may be a known PTC pin that can be commonly used, and since the material, size, and shape of the PTC pin can be changed according to the internal design of the PTC heater to be implemented, the present application is not particularly limited thereto.

Meanwhile, the heat-dissipating coating composition for forming the heat-dissipating coating film of the present application may improve excellent adhesion between the heat-dissipating coating film and the substrate, improved moisture resistance and weather resistance, and wettability of the heat-dissipating filler. In addition, as it exhibits excellent heat dissipation and insulation properties, excellent solvent resistance to organic solvents, no discoloration during curing, and easy control of heat conduction, a heat dissipation unit including an insulating heat dissipation coating layer realized with this can continuously express improved physical properties. can In addition, the dispersibility of the heat-dissipating filler dispersed in the heat-dissipating coating film is excellent, so that uniform insulation and heat dissipation performance can be exhibited. It can be widely applied to electrical and electronic, automobile, energy, and aerospace industries such as circuit boards mounted with various electric and electronic components requiring insulation and heat dissipation, lighting devices such as LED lamps, and display devices.

Although the present application will be described in more detail through the following examples, the following examples are not intended to limit the scope of the present application, which should be interpreted to aid understanding of the present application.

Hereinafter, Examples, Comparative Examples, and Experimental Examples of the present application will be described.

<Example 1>

Acrylic polyol (OH value 90) 20 parts by weight, caprolactone polyol (OH value 280, MW 400) 20 parts by weight, expanded graphite (average particle size 50 μm) 9.0 parts by weight, aluminum powder (Flake, average particle size 25 μm) 4.2 parts by weight Part, porous SiO ₂ (average particle size 4 μm) 3.2 parts by weight, phosphoric acid epoxy ester 8.5 parts by weight, dispersing agent (phosphoric ACID ester of polyethoxylated alkyl phenol) 0.5 parts by weight, silicone-based antifoaming agent (AFCONA 2722) 1.0 parts by weight, anti-settling agent (urea ) 0.5 part by weight, slip agent (polyether polysiloxane) 0.1 part by weight. 13 parts by weight of N-butyl acetate and 20 parts by weight of PMA (propylene glycol monomethyl ether acetate) were uniformly mixed with a dissolver mixer. The mixture was transferred to a basket mill and milled for 3 hours. The viscosity of the final paint was 700 cps.

<Example 2>

It was the same as in Example 1 except that 20 parts by weight of ester polyol (OH value 66, MW 400) was used instead of '20 parts by weight of caprolactone polyol' in Example 1. The viscosity of the final paint was 700 cps.

<Example 3>

It is the same as Example 1 except for 40 parts by weight of acrylic polyol (OH value 90) instead of '20 parts by weight of acrylic polyol (OH value 90), 20 parts by weight of caprolactone polyol (OH value 280, MW 400)' of Example 1.

<Example 4>

It is the same as in Example 1 except for using 9.0 parts by weight of natural impression graphite (average particle size 25 μm) instead of 9.0 parts by weight of 'expanded graphite (average particle size 50 μm)' of Example 1.

<Example 5>

It is the same as in Example 1 except that the 'anti-settling agent (urea) 0.5 parts by weight' of Example 1 was not used.

<Example 6>

Same as Example 1 except for 30 minutes of milling instead of 3 hours of Example 1.

<Example 7>

It is the same as Example 1 except that '0.5 parts by weight of a dispersant (phosphoric ester of polyethoxylated alkyl phenol), 1.0 parts by weight of a silicone-based antifoaming agent (AFCONA 2722), and 0.5 parts by weight of an anti-settling agent (urea)' of Example 1 was not used.

<Example 8>

Same as Example 4 except milling for 30 minutes instead of milling for 3 hours.

<Example 9>

Same as Example 1 except for 40 parts by weight of BPA-based epoxy resin (YD-128) instead of 'acrylic polyol (OH value 90) 20 parts by weight, caprolactone polyol (OH value 280, MW 400) 20 parts by weight' of Example 1 do.

<Example 10>

The paint prepared in Example 1 was used as the subject and coated in the same manner except that TDI was used instead of HDI.

<Example 11>

Except for 2 parts by weight of expanded graphite instead of 9 parts by weight of expanded graphite of Example 1 and 7 parts by weight of carbon black having an average particle size of 0.5 μm, it was the same as in Example 1.

<Example 12>

Expanded graphite (average particle size 50 μm) 9.0 parts by weight, aluminum powder (Flake, average particle size 25 μm) 4.2 parts by weight, porous SiO ₂ (average particle size 4 μm) 3.2 parts by weight instead of expanded graphite 16.4 parts by weight Same as in Example 1 except for did

<Comparative Example 1>

A heat-dissipating paint composition composed of 50% toluene solvent, 25% urethane binder, 12.5% carbon black, and 12.5% inorganic thermally conductive particles SiO ₂ was coated to evaluate heat dissipation performance.

<Experimental Example 1> Heat dissipation paint coating

20 parts by weight of HDI (hexamethylene diisocyanate) trimer was well mixed with 100 parts by weight of the heat dissipating paint prepared in each example so that the amount corresponding to the NCO value of 1.1 was well mixed, and the mixed solution was sprayed on both sides of an aluminum plate in an 80 ° C oven. It was dried and cured for 30 minutes in However, in the case of Example 9, the coating was cured in an oven at 100 ° C. for 3 hours using the same amount of diethylenetriamine as the epoxy group as a curing agent.

<Experimental Example 2> Evaluation of heat dissipation performance

After installing an acrylic chamber with dimensions of 400 mm x 150 mm x 500 mm in width, length, and height, respectively, in a constant temperature oven, the temperature inside the chamber was adjusted to 40°C. Both sides of a 1.5 mm aluminum (5000 series) plate of 235 mm and 150 mm in width and length, respectively, were sprayed with the prepared paint and coated to a thickness of 30 ± 5 μm. The coated aluminum plate was positioned at the center of the acrylic chamber, and a 15W ceramic heater was attached to the aluminum plate using thermal grease. At this time, the surface to which the heater is attached was masked during paint coating so that the paint was not applied. The heater was operated to measure the temperature when the temperature of the heater was in equilibrium. The heat dissipation performance was expressed as the temperature difference (℃) of T1 when the aluminum plate coated with the heat dissipation paint was attached to the aluminum plate. 1(a) is an aluminum plate, and FIG. 1(b) is an aluminum plate coated with a heat dissipating paint. 2 shows a sample for evaluating heat dissipation performance. In the sample of FIG. 2 , a heat dissipation coating film 10 is formed on both sides of an aluminum plate 100 and a ceramic heater 30 is attached using a thermal grease 20 . In FIG. 2 , T1 represents the temperature of the heating element, T2 represents the temperature of the outside, and T3 represents the temperature of the chamber.

<Experimental Example 3> Storage evaluation

In order to measure the physical properties of the paint film, the prepared paint was left at 20 ° C to measure and evaluate the storability of the paint, and then the heat dissipation performance was measured every week. After stirring the stored paint for 10 minutes at a stirring speed of 300 rpm, a curing agent was added, stirred for another 10 minutes, and then coated to measure heat dissipation performance. The number of times the heat dissipation paint was initially and unchanged was measured.

<Experimental Example 4> Adhesion (crosscut), evaluation

To measure the physical properties of the coating film, use a sharp knife to draw 11 lines at a distance of 1 mm horizontally and horizontally on the sample to make 100 squares. Momentarily pull at the ° position. It is possible to change the cross-cut interval when submitting the film thickness test report. (Do not exceed 20% of peeling in one area. The peeled area must be within 5% of the total area)

<Experimental Example 5> Hardness evaluation

In order to measure the physical properties of the coating film, the lead of the MITSUBUSHI hardness measurement pencil is left as it is, and the wood is cut into a length of about 5 to 6 mm, and the tip of the pencil is sharpened and the tip of the pencil is ground with sandpaper. Fix the pencil on the pencil hardness test jig and push it forward with a load of 750±10g applied while maintaining a 45° angle with the specimen surface. It is tested three times while changing the site on one specimen, and it is considered acceptable if there is no scratch mark more than once. (Number of pencil scratches/Number of tests, 1/3: pass, 2/3: fail) If it is difficult to visually determine the scratches, check with a magnifying glass of 20x magnification or higher. Surface hardness of each part (Plastic-Pencil hardness HB / Metals-Pencil hardness 2H or more)

<Experimental Example 6> Evaluation of thermal shock

In order to measure the physical properties of the coating film, after conducting a 6-cycle test with 70 ° C for 1 hour and -25 ° C for 1 hour as 1 cycle, it was based on the absence of abnormalities in appearance and later cross-cut.

The performance evaluation results according to Experimental Examples 1 to 6 of the heat sink manufactured according to Examples 1 to 12 and Comparative Example 1 are shown in Table 1 below.

Paint category	Example 1	Example 2	Example 3	Example 4	Example 5	Example 6	Example 7	Example 8	Example 9	Example 10	Example 11	Example 12	comparative example
Paint Storage (Note)	8	8	8	7	6	8	5	7	8	4	8	8	7
Coating crosscut (B)	5	4	5	5	5	5	5	5	5	4	5	5	5
Coating surface hardness (H)	2	2	2	2	2	2	2	2	2	2	2	2	2
Film thermal shock (B)	5	4	5	5	5	5	5	5	5	4	5	4	5
Heat dissipation performance (℃)	17	17	17	15	18	16	18	15	17	17	13	16	12

* Standard: Aluminum plate (heater temperature 95 ℃)

The heat dissipation performance of all examples in Table 1 showed a temperature drop of 3 to 6 ° C. compared to representative heat dissipation paints currently on the market, showing excellent heat dissipation performance. It is believed that graphite is exfoliated during milling, and some of it is dispersed in the binder in the form of GNPs or graphene, resulting in excellent heat dissipation characteristics. Comparing Example 1, Example 6, and Example 7, heat dissipation characteristics of the paint milled for 3 hours were superior to those milled for 30 minutes. This shows that the exfoliation of the expanded graphite continues to occur according to the milling time. On the other hand, when comparing Example 4 and Example 8, it can be seen that the heat dissipation characteristics are the same, which can be interpreted as indicating that in the case of natural impression graphite, delamination due to external force does not occur significantly compared to expanded graphite.

Examples 11 and 12 show the effect of the expanded graphite content. In Example 11, when the expanded graphite content is relatively small as 2 parts by weight, the physical properties of the coating film are the same as in Example 1, but the heat dissipation performance is significantly deteriorated. In contrast, it can be seen that the heat dissipation performance is rather deteriorated even when the expanded graphite amount is 16.4 parts by weight and used in a relatively large amount.

As an additive effect, it can be seen that when the anti-settling agent is not used in Example 5, the storage property of the paint is noticeably deteriorated. However, what is interesting is that when the anti-settling agent is not used, the heat dissipation performance of the paint is rather improved. It can be seen that the anti-settling agent greatly affects the arrangement of heat dissipating particles in the binder. In particular, in the case of Example 7, when various additives, in particular, dispersants were not used, it could be confirmed that the heat dissipation performance was improved even though the storage stability of the paint was deteriorated. This is contrary to the conventional prediction that an improvement in particle dispersion in a binder leads to an improvement in heat dissipation. That is, in the arrangement of the thermally conductive particles in the binder, it can be said that the heat dissipation efficiency is improved only when the particles have contact and aggregation to some extent.

In Example 2, it was shown that the ester polyol contains an aromatic component that is structurally stronger than the aliphatic chain, increasing the hardness of the coating film but lowering the adhesiveness. On the other hand, it can be seen in Example 9 that there is no difference in heat dissipation performance even when epoxy is used as a binder instead of urethane, and when TDI is used instead of HDI as a urethane curing agent, there is no difference in heat dissipation property, but since the curing agent is an aromatic compound, the coating film is relatively brittle and It has poor adhesive strength and is highly reactive compared to HDI, so it was not easy to secure storage for more than 4 weeks at the same room temperature.

<Experimental Example 7> Measurement of heat dissipation efficiency according to milling time

The results of measuring the heat dissipation efficiency according to the milling time of the compositions of Examples 1 and 4 are shown in FIG. 3 .

In the case of expanded graphite, heat dissipation efficiency is 10% before milling, 30% after milling for 1 hour, 50% after milling for 2 hours, and 55% after milling for 3 hours. It can be confirmed that this is good and the heat dissipation efficiency is very good when milling for 3 hours or more. In the case of 3 hours or more and 6 hours or less, there was no difference in heat dissipation efficiency. However, in the case of impression graphite, heat dissipation efficiency was 20% before milling, but it was confirmed that heat dissipation efficiency was 25% after 1 hour of milling. Heat radiation efficiency was expressed as temperature reduction efficiency (based on °C) compared to existing commercially available paints.

<Experimental Example 8> Measurement of thermal conductivity

For Example 1, the thermal conductivity was measured according to the milling time at 25° C. and is shown in Table 2 below. It can be seen that the thermal conductivity is very excellent when the expanded graphite is milled for 3 hours.

	1 hours	2 hours	3 hours
Vertical Thermal Conductivity (W/m.K)	One	0.9	1.44
Horizontal Thermal Conductivity (W/m.K)	4	5	5.2

Figure 4 shows the expanded graphite before milling, Figure 5 shows a SEM picture of expanded graphite after milling for 3 hours, Figure 6 shows a TEM picture of expanded graphite after milling for 3 hours. Those skilled in the art to which this application pertains will understand that this application can be implemented in other specific forms without changing its technical spirit or essential features. Therefore, the embodiments described above should be understood as illustrative in all respects and not limiting. The scope of the present application is indicated by the following claims rather than the detailed description above, and all changes or modifications derived from the meaning and scope of the claims and equivalent concepts thereof should be construed as being included in the scope of the present application.

Claims (23)

1. In the heat dissipation paint composition,

   Based on the total weight of the composition,

   30 to 60% by weight of a binder resin; 10 to 25% by weight of thermally conductive particles; 5 to 15% by weight of additives; and 10 to 50% by weight of a solvent; including,

   The binder resin,

   Contains a urethane resin or an epoxy resin,

   The thermally conductive particles,

   at least one or more graphite selected from the group consisting of expanded graphite, impression graphite, artificial graphite, and earthy graphite; and metal particles; A heat-dissipating paint composition comprising a.
2. The method of claim 1,

   The composition,

   It is milled to separate graphene nanoplates (GNP) or graphene from graphite and exfoliate,

   After the milling, the graphite particles, graphene nanoplate (GNP) particles or graphene particles have a diameter of 0.1 μm to 50 μm, characterized in that the heat dissipation paint composition.
3. The method of claim 2,

   The milling beads used in the milling,

   A heat-dissipating paint composition characterized in that the zirconia has a diameter of 0.05 mm to 3.0 mm.
4. The method of claim 2,

   The composition,

   A heat-dissipating paint composition characterized in that it is cured by adding a diisocyanate-based curing agent or an amine-based curing agent.
5. The method of claim 1,

   The expansion side edge,

   A heat-dissipating paint composition, characterized in that graphite in which interlayer expansion is made by heat treatment after acid treatment.
6. The method of claim 1,

   The viscosity of the composition is

   A heat dissipation paint composition, characterized in that 300 cps or more to 1500 cps or less.
7. The method of claim 1,

   The composition,

   A curing catalyst which is dibutyl tin dilaurate; and

   Ethylene glycol, propylene glycol, diethylene glycol, 1,3-butanediol, 1,4-butanediol, neopentyl glycol, 3-methyl-1,5-pentanediol, 2-butyl-2-ethyl-1,3-propane Diol, 2,4-diethyl-1,5-pentanediol, 1,2-hexanediol, 1,6-hexanediol, 1,8-octanediol, 1,9-nonanediol, 2-methyl-1, a spacer selected from the group consisting of 8-octanediol, 1,8-decanediol, octanedecanediol, glycerin, trimethylolpropane, pentaerythritol and hexanetriol; A heat-dissipating paint composition characterized in that it further comprises.
8. The method of claim 1,

   The metal particles,

   at least one selected from the group consisting of aluminum, iron, copper, zinc, tin, titanium, nickel, antimony, magnesium, vanadium, chromium, and zirconium;

   A heat-dissipating paint composition characterized in that it is a flake type with a diameter of 5 μm to 40 μm.
9. The method of claim 1,

   The thermally conductive particles,

   at least one carbon selected from the group consisting of carbon black, single-walled carbon nanotubes, multi-walled carbon nanotubes, graphene, and carbon fibers; and

   heat-dissipating filler; A heat-dissipating paint composition, characterized in that it further comprises one or more of.
10. The method of claim 9,

    The thermally conductive particles,

    5 to 15% by weight of graphite;

    1 to 6% by weight of metal particles;

    1 to 5% by weight carbon; and

    1 to 5% by weight of a heat dissipating filler; A heat-dissipating paint composition comprising a.
11. The method of claim 9,

    The heat radiation filler,

    Alumina, aluminum oxide, magnesium oxide, zinc oxide, silicon carbide, aluminum nitride, boron nitride, silicon nitride, aluminum hydroxide, magnesium hydroxide, boron carbide, zirconia, silicon nitride, barium titanate, strontium titanate, beryllium oxide, manganese oxide, oxide A heat-dissipating paint composition, characterized in that it is at least one selected from the group consisting of zirconia, boron oxide and silicon oxide.
12. The method of claim 1,

    The urethane resin,

    Acrylic polyol, caprolactone polyol, epoxy polyol, ester polyol, ether polyol, polycarbonate polyol, polyethylene glycol, polypropylene glycol, polytetramethylene glycol, ethylene glycol, diethylene glycol, 1,3-butanediol, 1,4-butanediol , neopentyl glycol, 3-methyl-1,5-pentanediol, 2-butyl-2-ethyl-1,3-propanediol, 2,4-diethyl-1,5-pentanediol, 1,2-hexane Diol, 1,6-hexanediol, 1,8-octanediol, 1,9-nonanediol, 2-methyl-1,8-octanediol, 1,8-decanediol, octanedecanediol, glycerin, trimethylolpropane , Pentaerythritol, hexanetriol, and at least one selected from the group consisting of polypropylene glycol, characterized in that the heat dissipation paint composition.
13. The method of claim 1,

    The epoxy resin,

    Bisphenol-based epoxy, phenol novolac-based epoxy, o-cresol novolac-based epoxy, multifunctional epoxy, amine-based epoxy, heterocyclic epoxy, substituted epoxy, naphthol-based epoxy, bisphenol A epoxy Resin, epichlorhydrin-type epoxy resin. Ethylene glycol glycidyl ether, polyethylene glycol diglycidyl ether, glycerin diglycidyl ether, glycerin triglycidyl ether, 1,6-hexanediol diglycidyl ether, trimethylolpropane triglycidyl ether, diglycidyl Cidylaniline, diglycidylamine, N,N,N',N'-tetraglycidyl-m-xylenediamine and 1,3-bis(N,N'-diglycidylaminemethyl)cyclohexane A heat-dissipating paint composition, characterized in that at least one selected from the group consisting of.
14. The method of claim 4,

    The diisocyanate-based curing agent,

    Hexamethylene diisocyanate (HDI), trimethylene diisocyanate, tetramethylene diisocyanate, 1,2-propylene diisocyanate, 1,3-butyl At least one selected from the group consisting of 1,3-butylene diisocyanate, dodecamethylene diisocyanate and 2,4,4-trimethylhexamethylene diisocyanate A heat-dissipating paint composition characterized by the above.
15. The method of claim 4,

    The amine-based curing agent,

    Hexamethylenediamine, Triethyldiamine, Polyethyleneimine, Hexamethylenetetramine, Diethylenetriamine, Triethyltetramine, Isoformdiamine, Diethylene Triamine, Triethylene Tetramine, Di Ethylamino propyl amine, Menthane diamine, N-aminoethylpiperazine, M-xylene diamine, Isophorone diamine, N ,N'-di-tert-butylethylenediamine (N,N'-di-tert-butylethylenediamine), N,N-di-iso-propylethylenediamine (N,N-di-iso-propylethylene-diamine), N ,N'-diisopropyl-1,3-propanediamine (N,N'-diisopropyl-1,3-propanediamine), and bis(2,2,6,6-tetramethyl-4-piperidyl)seba A heat-dissipating paint composition, characterized in that at least one selected from the group consisting of bis (2,2,6,6-tetramethyl-4-piperidyl) sebacate.
16. The method of claim 1,

    The solvent is

    N-butyl acetate, acetate, ethyl acetate, amyl acetate, methyl cellosolve acetate, ethyl cellosolve acetate, diethylene glycol methyl acetate, diethylene glycol ethyl acetate, ethylene glycol monoethyl ether acetate and 3-methoxybutyl acetate , At least one selected from the group consisting of propylene glycol methyl ether acetate (PGMEA), characterized in that the heat dissipation paint composition.
17. The method of claim 1,

    The additive is

    A heat dissipation paint composition, characterized in that at least one selected from the group consisting of a matting agent, a colorant, an adhesion promoter, a dispersing agent, an antisettling agent, an antifoaming agent, and a leveling agent.
18. The method of claim 17

    The dispersing agent,

    Phosphate ester of polyethoxylated alkylphenol, sulfuric acid ester, ethoxylated alkylphenol, ethoxylated castor oil, polyoxyethylene tristyrylphenyl ether, ethoxylated aliphatic alcohol, ethylene oxide/propylene oxide block copolymer, lignosulfonic acid Sodium salt, disodium salt of sulfuric acid, sodium salt of acrylic acid polymer, sodium salt of dodecyl sulfate, urea-formaldehyde resin, polyethylene glycol mono(tristyrylphenyl) ether, calcium salt of dodecylbenzenesulfonic acid, sodium stearate , sorbitan monostearate, polyoxyethylene ester of rosin, polyoxyethylene dodecyl mono ether, polyoxyethylene-polyoxypropylene block copolymer, polyoxyethylene monolaurate, polyoxyethylene monohexadecyl ether, polyoxy Ethylene monooleate, polyoxyethylene mono(cis-9-octadecenyl)ether, polyoxyethylene monostearate, polyoxyethylene monooctadecyl ether, polyoxyethylene diolate, polyoxyethylene distearate, polyoxy Ethylene Sorbitan Monolaurate, Polyoxyethylene Sorbitan Monooleate, Polyoxyethylene Sorbitan Monopalmitate, Polyoxyethylene Sorbitan Monostearate, Polyoxyethylene Sorbitan Trioleate, Polyoxyethylene Sorbitan Tristea oleic acid, polyglycerol ester of oleic acid, polyoxyethylene sorbitol hexastearate, polyoxyethylene monotetradecyl ether, polyoxyethylene sorbitol hexaoleate, fatty acid, tall-oil, sorbitol hexaester, ethoxylated castor oil, ethoxylated soybean A heat-dissipating paint composition comprising at least one selected from the group consisting of oil, ethoxylated polyoxyethylene sorbitol tetraoleate, glycerol and polyethylene glycol mixed esters, polyglycerol esters, monoglycerides, and sucrose esters.
19. The method of claim 17

    The adhesion promoter,

    It is an epoxy ester phosphate acid,

    The anti-settling agent,

    A heat dissipation paint composition characterized in that it is a urea-based compound.
20. milling the composition of claim 1 to prepare a dispersion; and

    preparing a heat-dissipating paint by adding a diisocyanate-based curing agent or an amine-based curing agent to the dispersion; Method for producing a heat-dissipating paint comprising a.
21. The method of claim 20

    Prior to preparing the dispersion,

    A method for producing a heat-dissipating paint, further comprising: ultrasonically treating graphite, dispersing graphite with an ultra-high pressure disperser, or treating graphite with a high-speed shear.
22. A heat-dissipating coating film formed by applying the heat-dissipating paint composition according to any one of claims 1 to 19 on a substrate and firing at 70 ° C to 100 ° C.
23. A heat sink comprising the heat dissipation coating film of claim 22.

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