KR20240000873A - Paint composition for heat dissipation and fire extinguishing of primary materials in electric vehicle lithium-ion batteries and internal combustion engine vehicle engine rooms - Google Patents

Abstract

The present invention provides a main unit comprising (a) a thermoplastic acrylic resin, (b) a first inorganic filler, (c) a second inorganic filler, and (d) a microcapsule for extinguishing an initial fire; and a coating composition for heat dissipation and initial fire extinguishing that can more effectively dissipate heat generated in lithium-ion electric vehicles and internal combustion engine vehicles, including a hardener portion, and can respond to initial fire when a fire occurs.

Description

Paint composition for heat dissipation and fire extinguishing of primary materials in electric vehicle lithium-ion batteries and internal combustion engine vehicle engine rooms}

The present invention relates to a paint composition for dissipating heat and extinguishing initial fire in the engine room of an electric vehicle lithium-ion battery and an internal combustion engine vehicle. Specifically, it effectively dissipates heat generated in the engine room of an electric vehicle lithium-ion battery and an internal combustion engine vehicle to prevent deterioration of the device. , it can prevent performance deterioration, breakdown, and shortened lifespan; it can prevent fire and explosion by preventing heat accumulation in any part of the device; and it can quickly extinguish fire in the early stages of a fire, reducing the risk and damage caused by fire. It relates to a paint composition for heat dissipation and initial fire extinguishing that can minimize.

Electric vehicles driven by a high voltage of 240 to 400 volts generated from lithium-ion batteries generate high output electricity from the battery, generating high heat in battery cells, modules, packs, and high-voltage electronic components when driving or charging the electric vehicle. .

In the case of an internal combustion engine vehicle, a high amount of heat is generated from various devices such as the engine and radiator in the engine room, as well as electrical wiring and exhaust systems, depending on driving. If the generated heat cannot be released to the outside and accumulates in one place and overheats, malfunction due to equipment failure may occur. This can cause the battery, parts, and devices to deteriorate, deform, or be damaged, resulting in reduced performance and shortened lifespan, which can lead to safety problems such as the risk of fire or explosion due to fire.

Therefore, the paint composition applied to the surface of the above equipment smoothes the performance of the lithium-ion battery system including high-voltage electric components and devices, the engine of an internal combustion engine vehicle, radiators, various devices, electrical wiring, and exhaust devices, while preventing shortening of lifespan. , efficient heat dissipation performance is required to maintain the temperature below the appropriate temperature (e.g. below 60°C) by dissipating heat generated within the equipment to the outside so that it does not accumulate in any one place, and in the event of a fire, the initial fire is quickly extinguished. Initial fire extinguishing performance that can minimize risk and damage is also required.

In lithium-ion battery cells, modules, packs, high-voltage electrical components and devices, and in internal combustion engine vehicles, engines, radiators and various devices, inner walls of engine rooms and under bonnets, aluminum, cold rolled steel, galvanized steel, and any wires. Various materials such as covering materials and old coatings can be used.

Therefore, while it can be applied to the surface of various materials as mentioned above, it can also be applied without a base coat or a middle coat, and has excellent heat dissipation performance in the form of a coat by spraying it once to the required area without structural deformation or change of the heat dissipation system. It is also required to obtain a coating film with fire extinguishing performance in the early stage of fire.

In addition, it has excellent adhesion, processability, corrosion resistance, water resistance, chemical resistance, and weather resistance that can be applied to pre-processing, post-coating, and pre-coating post-processing, and has heat resistance of over 200℃ and high heat transfer effect (heat transfer resistance). It is required, and the coating film must be able to cure (dry) quickly and be capable of natural curing or heat drying.

In the present invention, heat generated from electric vehicle lithium-ion batteries with high output and high voltage characteristics, internal combustion engine vehicle engine rooms or exhaust systems can be efficiently released by preventing heat from accumulating anywhere, and in the event of a fire, the heat is extinguished at an early stage. The aim is to provide a paint composition for heat dissipation and initial fire extinguishing that can minimize fire damage by preventing re-combustion, fire spread and explosion.

In order to achieve the above object, the coating composition for heat dissipation and initial fire extinguishing of one embodiment of the present invention includes a main part and a hardener part, and the main part includes (a) a thermoplastic acrylic resin, (b) a first inorganic filler, and (c) ) A second inorganic filler and (d) a microcapsule for extinguishing an initial fire, and the weight-based mixing ratio of (a) the thermoplastic acrylic resin, (b) the first inorganic filler, and (c) the second inorganic filler is (a) : (b) + (c) = 1: 0.7 ~ 1: 1, and (d) microcapsules for extinguishing initial fire are contained in an amount of 5 to 15% by weight based on the weight of the subject, and the hardener part is the entire paint. It may contain 15 to 30% by weight based on the weight of the composition.

In another embodiment of the present invention, the weight-based mixing ratio of (b) the first inorganic filler and (c) the second inorganic filler contained in the paint composition for heat dissipation and initial fire extinguishing is (b): (c) = It can be 2:1 to 4:1.

As another embodiment of the present invention, the first inorganic filler included in the paint composition for heat dissipation and initial fire extinguishing may be one or more selected from boron nitride, silicon carbide, and aluminum nitride.

As another embodiment of the present invention, the first inorganic filler included in the paint composition for heat dissipation and initial fire extinguishing may include boron nitride, silicon carbide, and aluminum nitride, and may be added at an amount of 20% based on the weight of the subject matter. It may contain ~30% by weight.

In another embodiment of the present invention, the first inorganic filler included in the paint composition for heat dissipation and initial fire extinguishing may include boron nitride, silicon carbide, and aluminum nitride, and the boron nitride has an average particle diameter of 45 ~280㎛, the average particle diameter of silicon carbide may be 10-40㎛, and the average particle diameter of aluminum nitride may be 30-80㎛.

As another embodiment of the present invention, the second inorganic filler included in the paint composition for heat dissipation and initial fire extinguishing may be any one or more of micro-calcined alumina, micro-calcined silica, and micro-calcined zinc phosphate.

As another embodiment of the present invention, the second inorganic filler included in the paint composition for heat dissipation and initial fire extinguishing may include micro-calcined alumina, micro-calcined silica, and micro-calcined zinc phosphate, and the weight of the subject matter It may contain 5 to 10% by weight.

As another embodiment of the present invention, the microcapsules for extinguishing an initial fire included in the paint composition for dissipating heat and extinguishing an initial fire may have a core-shell structure.

In another embodiment of the present invention, the core portion of the microcapsule for extinguishing an initial fire is composed of perfluoro 2-methyl-3-pentanone and 1,1,2,2, It may contain 3,3,4-heptafluoro cyclopentane (1,1,2,2,3,3,4-heptafluoro cyclopentane).

As another embodiment of the present invention, perfluoro 2-methyl-3-pentanone and 1,1,2,2 on the core of the microcapsule for extinguishing the initial fire. The content ratio of 3,3,4-heptafluoro cyclopentane (1,1,2,2,3,3,4-heptafluoro cyclopentane) may be 1:3 to 3:1.

As another embodiment of the present invention, the shell portion of the microcapsule for extinguishing an initial fire may include melamine-urea-formaldehyde resin.

As another embodiment of the present invention, the average particle diameter of the microcapsules for extinguishing an initial fire may be 60 to 80 μm.

In the present invention, the main part and the hardener part are included, and the weight-based mixing ratio of the thermoplastic acrylic resin, the first inorganic filler, and the second inorganic filler contained in the main part is adjusted, and the weight percentage of the microcapsule for extinguishing the initial fire and the hardener part is adjusted. We provide a paint composition for controlled heat dissipation and initial fire extinguishing, which can efficiently dissipate the generated heat to the outside without accumulating in any one place, and prevent explosion of equipment by extinguishing fire in the early stage of occurrence and preventing re-combustion. There is an effect that can be done.

Figure 1 is a diagram showing a cross-sectional view of a paint film for heat dissipation and initial fire extinguishing used in a battery product that can be ideally formed by curing and drying the paint composition for heat dissipation and initial fire extinguishing of the present invention.
Figure 2 is a diagram showing microcapsules included in a paint composition for heat dissipation and initial fire extinguishing used in the battery product of the present invention.
Figure 3 is a photograph showing the state over time when the hardened product obtained by drying and curing the composition for heat dissipation and initial fire extinguishing used in the battery product of the present invention is ignited and extinguished by finely pulverized granules.
Figure 4 is a diagram showing the DSC curve of the NH microcapsule and the microcapsule change (SEM Image) according to temperature change.
Figure 5 shows a graph comparing the temperature change of the dry film of the heat dissipation and initial fire extinguishing composition used in the battery product of the present invention with the temperature change of the uncoated surface.

The paint composition for heat dissipation and initial fire extinguishing of the present invention can be used in various devices such as lithium-ion battery cells, modules, and packs, high-voltage electric components, electrical wiring, engines of internal combustion engine vehicles, under the bonnet, etc., and exhaust systems of internal combustion engines. .

In addition, the paint composition for heat dissipation and initial fire extinguishing of the present invention does not cause structural deformation to almost all materials such as metals, non-ferrous metals, plastics, and wire coverings, and can be applied to necessary areas without a base or intermediate coating film to improve the performance and stability of the coating film. can be maintained and the lifespan of the device can be prevented from being shortened.

In order to fully understand the configuration and effects of the present invention, preferred embodiments of the present invention will be described with reference to the attached drawings. However, the present invention is not limited to the embodiments disclosed below, but can be implemented in various forms and various changes can be made. However, the description of the present embodiments is provided to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the present invention of the scope of the invention.

The coating composition for heat dissipation and initial fire extinguishing of the present invention may include a main part and a hardener part.

The main part of the paint composition for heat dissipation and initial fire extinguishing of the present invention may include a thermoplastic resin, which may function as a binder for the paint composition for heat dissipation and initial fire extinguishing, and may include thermoplastic acrylic resin, polyethylene, and polypropylene. , vinyl chloride resin, vinyl acetate resin, polystyrene, ABS resin, and polyurea resin, and may preferably include a thermoplastic acrylic resin.

The main components included in the paint composition for heat dissipation and fire extinguishing of the present invention include (a) a thermoplastic acrylic resin, (b) a first inorganic filler, (c) a second inorganic filler, and (d) microcapsules for initial fire extinguishing. can do.

The thermoplastic acrylic resin has excellent adhesion, corrosion resistance, hardness, impact resistance, water resistance, chemical resistance, durability, and weather resistance, and is suitable for use in styrene monomer, methyl methacrylate, butylacrylate monomer, 2-ethylhexyl acrylate, and 2-hydroxyl methacrylate. It may be any one or more of monomers of polymethacrylate and polymethacrylate.

The thermoplastic acrylic resin may be included in an amount of 30 to 40% by weight based on the weight of the main body of the paint composition for heat dissipation and initial fire extinguishing. If it is less than 30% by weight, adhesion and adhesion to the surface of the object may be reduced or the impact resistance of the coating film may be reduced. There may be a problem of deterioration, and if it exceeds 40% by weight, the hardness of the cured film of the coating composition may weaken and physical properties such as weather resistance may decrease.

The main component included in the paint composition for heat dissipation and initial fire extinguishing of the present invention may include polyurea resin, and preferably may include polyaspartic urea resin.

When the polyaspartic urea resin is included in the main part, it can combine with the aliphatic polyisocyanate that can be included in the curing agent part of the present invention, resulting in a rapid shortening of the curing time during room temperature curing and heat curing, and after curing. The cured coating film can exhibit excellent physical properties such as heat resistance, hardness, extensibility, flexibility, durability, weather resistance, water resistance, and abrasion resistance.

A polyaspartic urea resin with low viscosity and high solid content that can quickly shorten the curing time by combining with the aliphatic polyisocyanate is N,N-7-[methylenebis(2-methyl-4,1-cyclohexandyl). ]Aliphatic polyurea chain-extended with diamine in bis-,1,1',4,4'-tetra ethyl ester; ether amine; and 4,4'-diphenylmethane diisocyanate-linked polyurea.

The polyurea resin may be included in an amount of 6 to 10% by weight based on the weight of the main body of the coating composition for heat dissipation and initial fire extinguishment.

If the polyurea resin is less than 6% by weight based on the weight of the main body of the paint composition for heat dissipation and initial fire extinguishing, the chemical properties of the coating film such as salt spray resistance, alkali resistance, acid resistance, impact resistance, hardness, flexibility, and extensibility are affected. The physical properties of the coating film may deteriorate, and the drying time of the coating composition may increase.

Conversely, if the polyurea resin exceeds 10% by weight based on the weight of the main body of the paint composition for heat dissipation and initial fire extinguishing, the drying time of the paint composition may be shortened, but the heat conductivity of the coating film is lowered, leading to a decrease in heat dissipation efficiency. Problems may arise.

(b) The first inorganic filler included in the main part of the paint composition for heat dissipation and initial fire extinguishing of the present invention is a thermally conductive material that can function as a particle that emits heat generated from the battery, including boron nitride, silicon carbide, and It may be one or more selected from aluminum nitride.

The thermal conductivity of the boron nitride may be 350 to 450 W/m·K, the thermal conductivity of the silicon carbide may be 200 to 300 W/m·K, and the thermal conductivity of the aluminum nitride may be 170 to 320 W/m·K. The thermal conductivity of each of the materials may be If it is below this lower limit, the heat dissipation effect may be insufficient and a problem may occur in which heat generated from the battery cannot be sufficiently dissipated.

The average particle diameter of the aluminum nitride is 30 to 80 μm, preferably 40 to 60 μm, the average particle diameter of the boron nitride is 45 to 280 μm, preferably 65 to 210 μm, and the average particle diameter of the silicon carbide is 10 to 40 μm. ㎛, preferably 20 to 30 ㎛. If the upper limit of each of the above substances is exceeded, the dispersion time may become longer to achieve the particle size specifications when manufacturing the paint, which may reduce productivity.

(b) The first inorganic filler included in the main part of the coating composition for heat dissipation and initial fire extinguishing of the present invention may include boron nitride, silicon carbide, and aluminum nitride, and is 20 to 30 weight based on the weight of the main part. % may be included, but if the amount is less than 20% by weight based on the weight of the subject matter, the heat dissipation effect may be insufficient and a problem may occur in which heat generated from the battery cannot be sufficiently dissipated, and if it exceeds 30% by weight, the coating film may be damaged. Problems with reduced strength may occur.

(c) The second inorganic filler included in the coating composition for heat dissipation and initial fire extinguishing of the present invention may be any one or more of micro-calcined alumina, micro-calcined silica, and micro-calcined zinc phosphate.

On the other hand, when thermoplastic acrylic resin is used with any one or more of micro-calcined alumina, micro-calcined silica, and micro zinc phosphate, the organic bonding force is different in the curing process of the heat dissipation layer (coat film, coating layer) formed through the first inorganic filler. It can be about 20% stronger than binder resin, and as a result, the adhesion of the heat dissipation layer can be significantly improved without any light or medium, and has excellent adhesion to materials such as metals, non-ferrous metals, plastics, wire coverings, and all old coatings. It can be implemented.

Specifically, when micro-calcined alumina, micro-calcined silica, and micro zinc phosphate are used simultaneously with the thermoplastic acrylic resin, the strong organic bond energy between each component is generated during the curing process when forming the heat dissipation layer (coat film) formed through the first inorganic filler. Through this, a very excellent level of adhesion and adhesion can be achieved, and durability, weather resistance, rust prevention, and self-cleaning properties can also be greatly improved.

As above, the heat dissipation layer formed by curing the composition containing the first inorganic filler can exhibit a very excellent level of adhesion and adhesion regardless of the material of the object to be coated, and as a result, a separate undercoat or middle layer is unnecessary, Sufficient heat dissipation performance can be achieved with just a single heat dissipation layer, and sufficient heat dissipation effect can be achieved even with a very thin thickness.

Due to this excellent heat dissipation effect, the thickness of the heat dissipation layer of the present invention can be configured to be 100 ㎛ or less, and even this ultra-thin coating film (heat dissipation layer) can exhibit a heat dissipation effect superior to that of conventional heat dissipation layers. You can confirm that it exists.

Additionally, when using the composition of the present invention, the weight of the heat dissipating composition to be painted per unit area can be greatly reduced, thereby shortening the painting time and reducing costs.

In addition, during the curing process when forming a coating film, micro-fired silica, micro-fired alumina, and micro zinc phosphate combine with the acrylic binder, resulting in a synergy effect in which the organic bonding force becomes about 20% stronger than that of other types (series) of binders. ) occurs, so the above-mentioned adhesion, adhesion, durability, weather resistance, and rust prevention can be significantly improved.

Micro-calcined silica, micro-calcined alumina, and micro zinc phosphate can be manufactured by irradiating microwaves to generate heat using a typical calcination furnace using microwaves. Micro-calcined silica, micro-calcined alumina, and micro zinc phosphate have a low coefficient of thermal expansion and low thermal shock, so they can suppress deterioration and expansion and contraction of the heat dissipation layer, while also exhibiting excellent rust prevention performance. A preferable firing temperature may be about 700 to 1500°C, and more preferably about 800 to 1200°C.

The second inorganic filler included in the paint composition for heat dissipation and initial fire extinguishing of the present invention may include micro-calcined alumina, micro-calcined silica, and micro-calcined zinc phosphate, and is comprised of 5 to 10% by weight based on the weight of the main part. It can be included.

When the content is adjusted within the above range, a composition with improved adhesion, adhesion, durability, weather resistance, and rust prevention of the heat dissipation layer can be manufactured.

The weight-based mixing ratio of (b) the first inorganic filler and (c) the second inorganic filler included in the paint composition for heat dissipation and initial fire extinguishing of the present invention is (b): (c) = 2:1 to 4:1. If the weight of (b) the first inorganic filler is less than twice the weight of (c) the second inorganic filler, a problem may occur in which the heat dissipation performance of the formed coating film is deteriorated, and (c) the second inorganic filler Based on the weight of the filler, (b) if the weight of the first inorganic filler exceeds 4 times, the adhesion, adhesion, durability, weather resistance, and rust prevention of the heat radiation layer in the formed coating film may be reduced, or the physical strength may be reduced. You can.

The weight-based mixing ratio of (a) thermoplastic acrylic resin, (b) first inorganic filler, and (c) second inorganic filler included in the main part of the coating composition for heat dissipation and initial fire extinguishing of the present invention is (a): (b) )+(c) = 1:0.7 ~ 1:1.

When adjusted within the above range, it is possible to manufacture a composition that has the effect of maximizing the heat dissipation performance of the heat dissipation layer containing the first inorganic filler and at the same time has further improved adhesion, adhesion, durability, weather resistance, and rust prevention of the heat dissipation layer. You can.

The main component of the coating composition for heat dissipation and initial fire extinguishing of the present invention may further include a fluoro stain resistant additive.

The fluorine-based stain inhibitor can impart water and oil repellency to the heat dissipation layer, thereby improving the durability of the heat dissipation layer. The fluorine-based stain prevention agent may include one or more components among polyurethane containing a fluorine group, polyacrylic emulsion containing a fluorine group, and polyacrylic modified urethane emulsion containing a fluorine group. Based on the total weight of the heat dissipation composition, the fluorine-based stain inhibitor may be included in about 1 to 3% by weight. When included in the above weight range, the water and oil repellency of the coating film is appropriately improved.

The main component of the paint composition for heat dissipation and initial fire extinguishing of the present invention may further include one or more selected from the group consisting of a thickener, a corrosion inhibitor, and a wetting and dispersing and flow prevention agent.

A thickener can improve the storage stability of particles, such as controlling the viscosity of the composition, providing thickening and thixotropic properties, preventing particles from settling, improving redispersibility, and improving flowability.

The thickener may be, for example, hydroxyethyl cellulose, but is not limited thereto, and may be included in an amount of about 0.5 to 1.5% by weight based on the weight of the main portion of the paint composition for heat dissipation and initial fire extinguishing.

The corrosion inhibitor can minimize corrosion even in a high-temperature and humid environment, and may be included in about 0.1 to 1% by weight based on the weight of the main part of the paint composition for heat dissipation and initial fire extinguishment.

The wetting and dispersing agent has the function of increasing dispersibility and preventing pigment sedimentation, and the anti-flow agent has the function of preventing the flow of paint on the vertical surface when painting, thereby improving the workability of painting. Based on the weight of the main part, it may be included in about 0.1 to 1% by weight.

The main component of the coating composition for heat dissipation and initial fire extinguishing of the present invention may further include a fluorine-based surfactant.

The fluorine-based surfactant may contain a perfluoroalkyl group and may be included in an amount of 0.1 to 1% by weight based on the total weight of the composition. By including it within the above weight% range, excellent smoothness of the coating film can be imparted.

The main part or the hardener part of the coating composition for heat dissipation and initial fire extinguishing of the present invention may include butyl acetate.

Butyl acetate contained in the main part or hardener part functions to control viscosity and drying speed, maintain the smoothness of the coating film, and may be included in an amount of 15 to 25% by weight based on the weight of the hardener part of the paint composition for heat dissipation and initial fire extinguishing. However, if it is included in less than 15% by weight, the viscosity of the composition may increase, which may cause problems such as poor workability or lowered smoothness of the coating film, and if it is included in excess of 25% by weight, the viscosity of the composition may be too low, causing the coating film to flow during painting. Problems may occur in film formation, such as the film becoming thinner.

The main part or hardener part of the coating composition for heat dissipation and initial fire extinguishing of the present invention may contain ethyl acetate.

Ethyl acetate contained in the main part or hardener part functions to control viscosity and drying speed, maintain the smoothness of the coating film, and may be included in an amount of 15 to 25% by weight based on the weight of the hardener part of the paint composition for heat dissipation and initial fire extinguishing. However, if it is included in less than 15% by weight, the viscosity of the composition may increase, which may result in poor workability or problems with the smoothness of the coating film. If it is included in excess of 25% by weight, the viscosity of the composition may be too low, causing the coating film to flow and peel off during painting. Problems with film formation, such as thinning, may occur.

The hardener part included in the paint composition for heat dissipation and initial fire extinguishing of the present invention is a low-viscosity aliphatic polyisocyanate with a viscosity of 200 to 300 cps at 25 ° C. and an isocyanate functional group (-NCO) content in the molecule of 10 to 20% by weight. It may include, and preferably, the aliphatic polyisocyanate may be hexamethylene diisocyanate ((CH ₂ ) ₆ (NCO) ₂ ).

The aliphatic polyisocyanate contained in the hardener portion has a function of accelerating the curing of the coating film, and may be included in an amount of 45 to 55% by weight based on the weight of the hardener portion of the paint composition for heat dissipation and initial fire extinguishment. When contained in less than 45% by weight, Problems with low hardness of the coating film may occur, and if it is included in excess of 55% by weight, problems with the flexibility of the coating film may occur.

The hardener part may be included in an amount of 15 to 30% by weight based on the total weight of the paint composition. If it is included in less than 15% by weight, the paint composition may not be sufficiently cured, which may cause a problem in which the strength of the paint film is lowered. 30% by weight may be used. If it is included in excess, the hardness of the cured coating film may become too high, causing the coating film to be easily broken, and the flexibility and adhesion of the coating film may be reduced.

Figure 1 is a cross-sectional view showing the ideal state of a coating film formed when the coating composition for heat dissipation and initial fire extinguishing of the present invention is cured and dried.

Figure 1(a) shows an ideal view before the composition containing the N-H micro fire extinguishing capsule 10, the first inorganic filler 20, and the second inorganic filler 30 for extinguishing an initial fire is applied to the object 40 and cured and dried. It indicates the status.

Figure 1(b) shows the layer structure that the above particles can ideally form, each sequentially forming a microcapsule layer for initial extinguishing (10a) and a first inorganic filler heat dissipation layer (20a) with heat dissipation performance. , showing the undercoat layer (30a) containing the second inorganic filler.

The coating composition for heat dissipation and initial fire extinguishing of the present invention, when cured, includes a microcapsule layer (10a) for initial fire extinguishing at the top of the coating film, and a heat dissipating layer (20a) containing a first inorganic filler with heat dissipating performance below it, An undercoat layer 30a containing a second inorganic filler may be arranged.

As the paint composition for heat dissipation and initial fire extinguishing of the present invention is cured and dried, a microcapsule layer (10a) for initial fire extinguishing can be formed on the top of the coating film, which is included in the paint composition for heat dissipation and initial fire extinguishing of the present invention. More than 70% of the microcapsules are located at the top of the coating film, which may mean that the initial fire extinguishing microcapsule layer 10a has been formed. As described above, a large amount of microcapsules are located at the top of the coating film, thereby preventing the initial fire when a fire occurs. can be effectively suppressed.

As the coating composition for heat dissipation and initial fire extinguishing of the present invention is cured and dried, the first inorganic filler particles may be relatively disposed at the lower part of the microcapsule layer due to the difference in specific gravity.

The paint composition for heat dissipation and initial fire extinguishing of the present invention can form a heat dissipation layer (20a) with heat dissipation performance at the bottom of the microcapsule layer (10a) while curing, which is the first heat dissipation layer (20a) included in the water-based paint composition of the present invention. More than 70% of the inorganic filler particles are located at the bottom of the microcapsule layer (10a), which may mean that a heat dissipation layer (20a) with heat dissipation performance has been formed. As described above, a large amount of the first inorganic filler particles is contained in the microcapsule layer (10a). By being located immediately below the layer 10a, improved thermal conductivity can be achieved while exhibiting the ability to suppress an initial fire.

The heat dissipation layer 20a containing the first inorganic filler may include one or more selected from boron nitride, silicon carbide, and aluminum nitride, and is preferably composed of boron nitride, silicon carbide, and aluminum nitride with different thermal conductivities. The first inorganic filler may be mixed, and through mixing as above, the thermal conductivity of the coating film made of a polymer composite with a thermal conductivity of 0.15 to 0.21 W/m·K is maximized to 7 W/m·K, thereby making the coating film Through this, the heat generated from the object to be coated can be dissipated to the outside very quickly.

The thermal conductivity of boron nitride that can be included in the paint composition for heat dissipation and initial fire extinguishing of the present invention is 350 to 450 W/m·K, the thermal conductivity of silicon carbide is 200 to 300 W/m·K, and the thermal conductivity of aluminum nitride is 170 to 320 W. /m·K, and during the manufacturing process, the particle size of the composition in which the silicon carbide, boron nitride, and aluminum nitride particles form a heat dissipation layer in the coating film can be manufactured to have a particle size of 30㎛ to 40㎛.

As described above, boron nitride, silicon carbide, and aluminum nitride having different high thermal conductivities are mixed together, and the particle size of the composition forming the heat dissipation layer in the coating film is limited to the above range, and the amount of heat transfer from small to large thermal conductivity As this increased heat bridge phenomenon is maximized, the heat dissipation performance of the coating film can be greatly improved.

Figure 2 is a diagram showing a cross-section of a microcapsule for initial fire extinguishing included in the paint composition for heat dissipation and initial fire extinguishing of the present invention.

The paint composition for heat dissipation and initial fire extinguishing of the present invention may include extinguishing microcapsules for extinguishing initial fire. As shown in FIG. 2, the extinguishing microcapsules may be configured in a form including a core-shell structure. You can.

In the case of the microcapsule of the present invention consisting of a core-shell structure, it is used to initially extinguish a fire by discharging the fire extinguishing composition, which is a material within the microcapsule, to the outside.

Specifically, in the event of a fire, the fire extinguishing composition may vaporize and expand due to heat, but does not react (rupture or leak) due to the durability and airtightness of the shell portion, and then bursts and vaporizes by self-sensitizing to a temperature of 120 to 220 ° C in the event of a fire. The fire extinguishing composition is sprayed directly on the flame and can extinguish the fire by breaking the chain reaction among the four conditions of combustion: fuel (combustibles), oxygen (air), heat (ignition source), and chain reaction. In addition, re-burning can be suppressed by cooling from 800℃ to 30℃ within 15 seconds.

The microcapsule according to this embodiment includes a micro-sized shell portion with a closed space formed therein, and a fire extinguishing composition on the core portion located inside the shell portion.

In the event of a fire, when the shell part reaches 120~220℃ due to thermal runaway, it senses this temperature (self-temperature response) and melts and bursts within 8 seconds, spraying the fire extinguishing agent in the core, forming a thermoplastic resin that can extinguish the fire at an early stage. You can. And re-burning can be suppressed by cooling from 800℃ to 30℃ within 15 seconds.

Specifically, the shell portion is preferably made of a non-porous high molecular weight polymer in order to function in response to temperature. For example, polyurethane resin, polyurea resin, polyamide resin, polyester resin, polycarbonate resin, aminoaldehyde resin, melamine resin, polystyrene resin, styrene-acrylate copolymer resin, styrene-methacrylate copolymer resin. , gelatin, polyvinyl alcohol, phenol formaldehyde resin, and resorcinol formaldehyde resin.

More preferably, the shell portion may be configured to include melamine-urea-formaldehyde resin, which has a sensitive temperature response, and has a temperature range of 120~120. Excellent initial fire extinguishing effect can be achieved by sensitively self-sensing at a temperature in the 220℃ range, destroying the shell and spraying extinguishing substances.

The shell portion forms the outer shape of the microcapsule.

Meanwhile, in this embodiment, an example in which the shell portion is formed in a spherical shape is disclosed, but it is not limited to this. For example, the shell part may be formed in a tube shape, and the fire extinguishing composition may be built into the closed space inside the tube-shaped shell part.

The core portion present inside the shell portion may contain a fire extinguishing composition.

The fire extinguishing composition of the present invention includes perfluoro 2-methyl-3-pentanone and 1,1,2,2,3,3,4-heptafluoro cyclopentane ( 1,1,2,2,3,3,4-heptafluoro cyclopentane).

The perfluoro 2-methyl-3-pentanone and 1,1,2,2,3,3,4-heptafluoro cyclopentane (1,1,2, 2,3,3,4-heptafluoro cyclopentane) has excellent storage stability inside the shell and can exhibit effective spraying efficiency when released outside the shell.

On the other hand, the perfluoro 2-methyl-3-pentanone and 1,1,2,2,3,3,4-heptafluoro cyclopentane (1,1, 2,2,3,3,4-heptafluoro cyclopentane) is preferably mixed in a ratio of 1:3 to 3:1.

If the ratio of perfluoro 2-methyl-3-pentanone to 1,1,2,2,3,3,4-heptafluoro cyclopentane is less than 1:3, the fire extinguishing ability and extinguishing substances in the core of the shell Problems may arise in the storage stability of perfluoro 2-methyl-3-pentanone if the ratio of perfluoro 2-methyl-3-pentanone to 1,1,2,2,3,3,4-heptafluoro cyclopentane exceeds 3:1. A problem may arise in which the re-burning prevention effect of the fire extinguishing agent in the shell core is reduced.

The particle size of the extinguishing microcapsules of the present invention is preferably adjusted to 60-80㎛.

If the particle diameter of the microcapsule is less than 60㎛, the particle diameter of the capsule becomes small, which may lead to difficulties in the process of applying it to a specific area on the surface of the object. Conversely, if it exceeds 80㎛, the surface area per unit weight becomes small and temperature changes occur. Problems may arise in which rapid response is not possible.

Meanwhile, based on the weight of the main substance of the coating composition for heat dissipation and initial fire extinguishing of the present invention, the content of the extinguishing microcapsules is preferably contained in 5 to 15% by weight.

When the content is adjusted within this range, the heat dissipation effect of the heat dissipation layer, as well as physical properties such as weather resistance, durability, heat resistance, and contamination resistance, can be optimally adjusted. However, if it is less than 5% by weight, a problem may occur where the initial fire extinguishing effect is insufficient. If it is contained in excess of 15% by weight, painting workability deteriorates due to an increase in viscosity, the durability of the dry coating film deteriorates, and it may be inappropriate in terms of manufacturing cost.

In particular, by appropriately adjusting the content of the extinguishing microcapsules and the content of the first inorganic filler for heat dissipation, a composition that can maintain excellent heat dissipation performance while having a new effect of extinguishing an initial fire can be manufactured.

In particular, the content of the extinguishing microcapsules: the total content of the first inorganic filler can be adjusted to 1:1.5 ~ 1:3.5. If the ratio of the total content of the first inorganic filler to the content of the microcapsules is 1.5 or less, after curing If the amount of microcapsules located at the top of the dry paint film becomes too large, the purpose of initial fire suppression may be sufficiently achieved, but the problem of relatively low heat dissipation performance may occur, and if it is more than 3.5, the microcapsules forming at the top of the dry film film may occur. As the layer becomes thinner and the mixing ratio of the first inorganic filler particles with the layer formed by the microcapsules increases, a problem may occur in which the effectiveness of extinguishing an initial fire may be reduced.

In other words, by adjusting the ratio of the content of the above-mentioned extinguishing microcapsules and the total content of the first inorganic filler, a dry film is formed that has excellent initial fire extinguishing performance and heat dissipation performance showing a thermal conductivity of about 7 W/m·K or more. can do.

It can be confirmed through specific experiments that thermal conductivity of more than 7W/m·K can be achieved by adjusting the ratio of the above extinguishing microcapsule content:total amount of the first inorganic filler.

For example, if the object to be coated with paint is a steel plate with a width of 150 mm, a length of 70 mm, and a thickness of 1.2 mm, the temperature range of the surface (unpainted surface) is measured while heating the object for a certain period of time with a heat source in an unpainted state, The temperature range of the surface (coated surface) can be measured by forming a dry coating film with a thickness of 100 ㎛ on the object and heating it for a certain period of time using the same heat source as above.

At this time, the temperature of the unpainted surface can be measured at 65 to 75 ℃ with a heating time of 40 to 90 minutes, and the temperature of the painted surface can be measured at 55 to 60 ℃ with a heating time of 40 to 90 minutes. This means that the temperature difference at the same heating time is 10 to 15°C, indicating that the heat dissipation performance of the painted surface is significantly superior to that of the unpainted surface.

Therefore, as described above, the content of the microcapsules for fire extinguishing and the content of the first inorganic filler for heat dissipation are appropriately adjusted, and the coating film forms the above layer after curing and drying, thereby providing a new effect of extinguishing the initial fire and improving heat dissipation performance. It is possible to provide a composition that maintains excellent properties.

Figure 3 is an actual photograph showing the state over time when the cured product of the paint composition for heat dissipation and initial fire extinguishing of the present invention is dried and cured and ignited with a flame in finely ground particles and extinguished, where 3a is before ignition ( 0 seconds), 3b represents the state after 4 seconds, 3c represents the state after 8 seconds, and 3d represents the state after 15 seconds.

The particles are burned and ignited for up to 8 seconds after ignition, but after 8 seconds, they are gradually extinguished and tend to be completely extinguished after 15 seconds. This is because the shell of the microcapsule contained in the composition undergoes thermal runaway at 120-220°C when a fire occurs. When it reaches this temperature, it melts and bursts within 8 seconds and the fire extinguishing agent in the core is sprayed, and the fire extinguishing agent is cooled from 800℃ to 30℃ within 15 seconds to suppress re-combustion, so the tendency is the same as above. can be seen as visible.

Figure 4 is a diagram showing the differential scanning calorimetry (DSC) curve of the N-H microcapsule and the microcapsule change (SEM image) according to temperature change.

At around 72℃, the microcapsules exist in a spherical shape, but at around 150℃, it responds to temperature and confirms that the shell part exists in a ruptured form, indicating that the extinguishing agent in the core can be sprayed in the 120~220℃ response temperature range. could know that

Hereinafter, specific examples are presented to aid understanding of the present invention. However, the following examples are provided only to make the present invention easier to understand, and the content of the present invention is not limited by the examples.

The components and functions or properties of the main part of the paint composition for heat dissipation and initial fire extinguishing used in the battery product of the present invention are listed in [Table 1] below, and the components and functions or characteristics of the hardener part of the paint composition for heat dissipation and initial fire extinguishment are as follows. The composition ratios of Examples 1 and 2 and Comparative Examples 1 to 3 of the main part are shown in [Table 2] below, and the composition ratios of Examples 1 and 2 and Comparative Examples 1 to 3 of the hardener part are shown in [Table 3] below. Each is listed in Table 4].

NO Substances of the subject matter function or characteristic One Butyl acetate Viscosity and drying speed control
Maintaining the smoothness of the paint film 2 Ethyl acetate Viscosity and drying speed control
Maintaining the smoothness of the paint film 3 Fluorinated surfactant (Product name: 3M FC-4430) For dispersing and leveling purposes 4 Wetting and dispersing and anti-flow agent (Product name: SYNTHRO PON 77SB) Prevents sedimentation of pigments 5 Thermoplastic acrylic resin (Product name: AC-4120) Binder role
Content of non-volatile material (NVM): 48% 6 Epoxysilane Improves adhesion of organic and inorganic materials 7 Boron nitride (BN, boron nitride) (Product name: 3M BNCF flake CFF200-15) Thermal conductivity: 400W/m·K
Average particle diameter: 55㎛ 8 Silicon carbide (SiC, silicon carbide) (Product name: PLUS.A.C.T) Thermal conductivity: 250W/m·K
Average particle diameter: 25㎛ 9 Aluminum nitride (AIN, aluminum nitride) Thermal conductivity: 275W/m·K Average particle diameter: 45㎛ 10 Calcined micro alumina Improved adhesion and adhesion to substrate
Improved film forming ability 11 Calcined Micro Silica Improved adhesion and adhesion to substrate
Improved film forming ability 12 micro zinc phosphate Improved rust prevention, adhesion, and durability 13 Non-toxic rust preventive pigment Prevents corrosion of the surface of the object to be coated 14 thickener Increases the viscosity of paint 15 defoamer Removes foamNo volatile organic compounds (VOCs) 16 surface smoother Surface corrosion prevention 17 Fluorine-based stain resistance additive Used to increase water and oil repellency and film durability 18 Corrosion inhibitor Prevents corrosion of the surface of the object to be coated 19 Polyaspartic polyurea resin By combining with aliphatic polyisocyanate, the curing time can be quickly shortened, and the physical properties of the cured film are improved after curing. 20 N-H-microcapsule for initial fire extinguishing When an initial fire occurs and the temperature reaches 120℃ due to thermal runaway, the temperature is detected and the shell is broken. The extinguishing agent spreads within 8 seconds to suppress the spread of the initial fire, and cools from 800℃ to 30℃ within 15 seconds and recombusts. suppress

NO Hardener component constituents function or characteristic One Asahi Kasei non-yellowing aliphatic polyisocyanate (MFA-75X) Paint film hardening function
Hexamethylene diisocyanate with a viscosity of 200 to 300 cps at 25°C and an isocyanate functional group (-NCO) content of 10 to 20% by weight in the molecule. 2 ethyl acetate Viscosity and drying speed control
Maintaining the smoothness of the paint film 3 butyl acetate Controls viscosity and drying speed Maintains smoothness of coating film 4 toluene Controls viscosity and drying speed Maintains smoothness of coating film

(Unit: g) NO Components of the subject matter Example 1 Example 2 Comparative Example 1 Comparative example 2 Comparative example 3 Comparative example 4 One Butyl acetate 2.7 2.7 2.7 2.7 2.7 2.7 2 Ethyl acetate 2.7 2.7 2.7 2.7 2.7 2.7 3 Fluorine-based surfactant 0.4 0.4 0.4 0.4 0.4 0.4 4 Wetting dispersion and anti-flow agent 0.4 0.4 0.4 0.4 0.4 0.4 5 thermoplastic acrylic resin 36 33.3 45.5 27.9 38.6 36 6 Epoxysilane 0.4 0.4 0.4 0.4 0.4 0.4 7 boron nitride 9 10 4 13 9 9 8 silicon carbide 9 10 4 13 9 9 9 aluminum nitride 8 9 3 12 8 8 10 Calcined micro alumina 2.7 2.6 4.4 2.6 2.7 2.7 11 Calcined Micro Silica 2.7 2.6 4.4 2.6 2.7 2.7 12 micro zinc phosphate 2.7 2.6 4.4 2.6 2.7 2.7 13 Non-toxic rust preventive pigment 2.7 2.7 2.7 2.7 2.7 2.7 14 thickener 0.9 0.9 0.9 0.9 0.9 0.9 15 defoamer 0.4 0.4 0.4 0.4 0.4 0.4 16 surface smoother 0.4 0.4 0.4 0.4 0.4 0.4 17 Fluorine-based stain resistance additive 0.9 0.9 0.9 0.9 0.9 0.9 18 Corrosion inhibitor 0.4 0.4 0.4 0.4 0.4 0.4 19 Polyaspartic polyurea resin 8.6 8.6 9 5 12 8.6 20 N-H-microcapsule for initial fire extinguishing 9 9 9 9 3 9 100 100 100 100 100 100

(Unit: g) NO Components of the hardener part Example 1 Example 2 Comparative Example 1 Comparative example 2 Comparative example 3 Comparative example 4 One Asahi Kasei Non-yellowing Aliphatic polyisocyanate (MFA-75X) 12.5 12.5 12.5 12.5 12.5 25 2 Ethyl Acetate 4.5 4.5 4.5 4.5 4.5 9 3 Butyl Acetate 4.5 4.5 4.5 4.5 4.5 9 4 Toluene 3.5 3.5 3.5 3.5 3.5 7 25 25 25 25 25 50

[Example 1]

1. Components 1 to 4 of [Table 1] were weighed and added to a high-speed tank mixer according to the mixing ratio, and stirred for 5 minutes at a speed of 300 rpm through a 15HP continuously variable stirrer with an impeller diameter of 33 cm.

2. Proceed with the stirring process of 1 above, add an amount equivalent to 1/5 of component 5 in [Table 1], then continue stirring while increasing the stirring speed to 500 rpm, and add the remaining amount and stir at 500 rpm for 10 minutes. Stirring was continued, and component 6 of [Table 1] was added and stirred for 10 minutes.

3. While continuing the stirring process in step 2 above, component 7 of [Table 1] was added and mixed, and the stirring speed was increased to 600 rpm and stirred for 10 minutes.

4. While continuing the stirring process in step 3, gradually add component 8 of [Table 1] and confirm that it is mixed, increase the stirring speed to 700 rpm, and gradually add components 10 to 14 of [Table 1] sequentially. After confirming that the mixture was mixed, the stirring speed was increased to 900 rpm and stirred for 60 minutes.

5. The stirring speed of step 4 was lowered to 600 rpm, an amount equivalent to about 1/2 of component 19 in [Table 1] was added, and stirred for 20 minutes.

6. The uniform state of the coating film without particles was confirmed using a 60㎛ applicator on a glass plate.

7. A circulating bead mill device was filled with zirconia beads with a diameter of 1 mm up to 50%, and the particle size was circulated and dispersed to a size of 30 μm or less.

8. After going through the circular dispersion process in step 7 above, the particle size of 30㎛ or less was confirmed using a particle size meter, and the uniform condition of the coating film without particles was confirmed using a 60㎛ applicator on a glass plate.

9. Receive the dispersed mill-base in a separate container whose uniform state was confirmed through step 8 above, and while stirring at 600 rpm, mix the components 16 to 18 of [Table 1] into the dispersed mill-base. -base) and stirred at 600 rpm for 10 minutes.

10. While continuing the stirring process in step 9 above, an amount equivalent to about 1/4 of the component 19 in [Table 1] was added and stirred for 10 minutes.

11. After going through the stirring process in step 10 above, the uniform state of the coating film without particles was confirmed using a 60㎛ applicator.

12. The stirring speed of 11 was lowered to 300 rpm, an amount equivalent to about 1/4 of component 19 in [Table 1] was added, and stirred for 20 minutes.

13. While continuing the stirring process in step 12 above, component 15 of [Table 1] was added and stirred for 10 minutes.

14. The main part was manufactured by confirming the uniform and anti-foaming state of the coating film without particles using a 90㎛ applicator on a glass plate.

15. Components 1 to 4 of [Table 2] were weighed and added to the high-speed tank mixer according to the mixing ratio, and stirred for 10 minutes at a speed of 300 rpm through a 15HP continuously variable stirrer with an impeller diameter of 33 cm.

16. After going through the stirring process in step 15 above, the uniform state of the coating film without particles was confirmed using a 60㎛ applicator, and the hardener part was manufactured.

17. The main part prepared in 14 above and the hardener part prepared in 16 above were mixed and stirred for 20 minutes at a speed of 300 rpm to prepare a paint composition.

[Example 2]

Steps 1 to 17 of Example 1 were performed by varying the composition ratios of components 3 to 5, components 7 to 14, and components 17 to 19 in [Table 1].

[Comparative Example 1]

Steps 1 to 17 of Example 1 were performed by varying the composition ratios of component 5 and components 7 to 12 in [Table 1].

[Comparative Example 2]

Steps 1 to 17 of Example 1 were performed by varying the composition ratios of component 5 and components 7 to 9 in [Table 1].

[Comparative Example 3]

Steps 1 to 17 of Example 1 were performed by varying the composition ratios of component 5 and component 20 in [Table 1].

[Comparative Example 4]

Steps 1 to 17 of Example 1 were performed by varying the composition ratios of components 1 to 4 in [Table 2].

[Test example] Drying time and performance measurement

<Dry film formation>

The paint compositions of Examples 1 and 2 and Comparative Examples 1 to 4 were diluted with an acrylic urethane diluent and applied to a steel plate 70 mm wide, 150 mm long, and 1.2 mm thick according to the dry film formation conditions shown in Table 5 below. dried.

Dry film formation conditions unit Example 1 Example 2 Comparative Example 1 Comparative example 2 Comparative example 3 Comparative example 4 Base and hardener weight ratio
Subject : Hardener - 4:1 4:1 4:1 4:1 4:1 2:1 painting equipment - brush brush brush brush brush brush low and medium - necessary
doesn't exist necessary
doesn't exist necessary
doesn't exist necessary
doesn't exist necessary
doesn't exist necessary
doesn't exist Number of coatings episode One One One One One One

<Drying time measurement>

[Table 6] below shows the room temperature drying time and heat drying time.

Touch drying time measures the time until the paint has adhesive properties but does not stick to the finger when lightly touched with a finger at 25°C (room temperature). Curing drying refers to the time when force is applied vertically based on the surface of the coating film. It measures the time it takes for the formed coating film to reach a state where no abnormalities such as stretching or wrinkles occur.

The touch drying and curing drying times were measured differently in each Example and Comparative Example as shown in [Table 6] below.

The heating drying time is measured by measuring the time until the formed coating film does not stretch or wrinkle or abnormalities occur when drying at 60°C and applying force perpendicular to the coating surface.

The heat drying time was measured differently in each Example and Comparative Example as shown in [Table 6] below.

Dry film formation conditions unit Example 1 Example 2 Comparative Example 1 Comparative example 2 Comparative Example 3 Comparative Example 4 room temperature
drying time
(25℃) touch
drying time minute 4 4 4 15 4 4 Hardening
drying time minute 50 50 50 85 50 40 Heating drying time (60℃) minute 20 20 20 40 20 20

In the case of Comparative Example 2, it was confirmed that the room temperature drying time and heat drying time of the coating composition were increased compared to the Example by containing less than 6% by weight of polyurea resin relative to the total weight of the base material.

In the case of Comparative Example 3, the polyurea resin was included in excess of 10% by weight relative to the total weight of the subject, so there was no change in room temperature drying time and heat drying time compared to the Example, but the thermal conductivity of the coating film measured below It was confirmed that was lower when compared with the example.

<Measurement of dry film performance>

Each performance of the dried film formed through the drying process of the compositions of Examples 1 and 2 and Comparative Examples 1 to 4 was measured according to the following method.

1. Thermal conductivity measurement: The dried coating film formed from the coating composition of Examples 1 and 2 and Comparative Examples 1 to 4 was measured using a liquid thermal conductivity meter, model number THW-L1, manufactured by THERMTEST INSTRUMENTS. As a result of the measurement, it was confirmed that the thermal conductivity of the dry coating film formed using the compositions of Examples 1 and 2 showed excellent heat dissipation performance compared to the thermal conductivity of the dry coating film formed using the compositions of Comparative Examples 1 to 4.

2. Measurement of temperature difference compared to uncoated: The temperature change over time was measured for the dried film formed from the paint composition of Examples 1 and 2 and Comparative Examples 1 to 4 using a hot plate, temperature sensor, and temperature measuring device. . Specifically, a temperature sensor is attached to the surface of the painted surface and the unpainted surface, connected to a temperature measuring device including a data logger, raised to 100℃, placed on a hot plate where 100℃ is continuously maintained, and heated for 60 minutes. The temperature difference between the unpainted surface and the painted surface was measured at 5-minute intervals until the 90th minute and at 10-minute intervals until the 90th minute.

The measurement results of Example 1 were shown in [Table 7] and the measurement results of Example 2 were shown in [Table 8]. Figures 5 (a) and (b) show the measurement results of Example 1 and Example 2, respectively. It is expressed as a graph.

hour
(minute) 5 10 15 20 25 30 35 40 45 50 55 60 70 80 90 T _A 30.2 35.4 42.6 49.1 56.3 61.5 63.4 65.2 68.6 70.1 71.0 71.5 72.3 73.0 73.6 T _B 29.3 32.6 37.1 42.7 49.4 54.1 55.2 56.2 58.5 59.1 59.0 59.2 59.3 59.5 59.7 △T 0.9 2.8 5.5 6.4 6.9 7.4 8.2 9.0 10.1 11.0 12.0 12.3 13.1 13.5 13.9 T _A : Temperature of uncoated surface
T _B : Temperature of painted surface
△T: Temperature of unpainted surface (T _A ) - Temperature of painted surface (T _B )

hour
(minute) 5 10 15 20 25 30 35 40 45 50 55 60 70 80 90 T _A 30.2 35.4 42.6 49.1 56.3 61.5 63.4 65.2 68.6 7 0.1 71.0 71.5 72.3 73.0 73.6 T _B 29.4 32.6 37.2 42.8 49.5 54.2 55.4 56.2 58.6 59.2 59.1 59.2 59.3 59.5 59.7 △T 0.8 2.8 5.4 6.3 6.8 7.3 8.0 9.0 10.0 10.9 11.9 12.3 13 13.5 13.9 T _A : Temperature of uncoated surface
T _B : Temperature of painted surface
△T: Temperature of unpainted surface (T _A ) - Temperature of painted surface (T _B )

The range of △T confirmed after 40 minutes through the dry film formed from the composition of Example 1 or 2 was 9 to 14°C, and after 40 minutes through the dry film formed from the composition of Comparative Examples 1 to 4. When compared to the confirmed range of △T, it was confirmed that the temperature difference became larger, showing excellent heat dissipation performance.

3. Dielectric strength measurement: The dielectric strength of the dry coating film formed with the coating composition of Examples 1 and 2 and Comparative Examples 1 to 4 was measured using the ASTM D-149 test method. As a result of the measurement, when comparing the dielectric strength of the dry coating film formed using the composition of the Example with the dielectric strength of the dry coating film formed using the composition of Comparative Examples 1 to 4, it was confirmed that the dry coating film of the Example did not have insulation breakdown at high voltage. I was able to.

4. Adhesion (adhesion) measurement: The adhesion (adhesion) of the dried coating film formed with the coating composition of Examples 1 and 2 and Comparative Examples 1 to 4 was measured using the ASTM D 3359 test method. As a result of the measurement, it was confirmed that the adhesion of the dry coating film formed using the composition of the Example was superior to that of the dry coating film formed using the composition of Comparative Examples 1, 2, and 4.

5. Impact resistance measurement: A Dupont type impact tester was used, and the dry coating film formed from the paint composition of Examples 1 and 2 was placed on the lower part of the tester, and then a 500g weight was dropped from 30cm above to test whether the coating film was destroyed. Dry coating films formed from the coating compositions of Comparative Examples 1 to 4 were also tested in the same manner as above. As a result of the measurement, it was confirmed that the impact properties of the dry coating films formed using the compositions of Examples 1 and 2 were superior to those of the dry coating films formed using the compositions of Comparative Examples 2 and 4.

6. Measurement of salt water spray resistance: The salt water spray resistance of dried coating films formed with the paint compositions of Examples 1 and 2 and Comparative Examples 1 to 4 was measured using the KS D 6711 salt water spray resistance test method. For measurement, rusting was confirmed by spraying 5% sodium chloride (NaCl) for 168 hours. As a result of the measurement, it was confirmed that rusting did not occur in the dry film formed using the compositions of Examples 1 and 2, and it was confirmed that rusting occurred in the dry film formed using the compositions of Comparative Examples 2 and 4.

7. Alkali resistance measurement: The alkali resistance of the dried film formed with the paint composition of Examples 1 and 2 and Comparative Examples 1 to 4 was measured using the KSM ISO 2812-1 test method. The measurement was performed by leaving the sample in a 5% sodium carbonate (Na₂C0₃) aqueous solution for 72 hours to check whether immersion peeling occurred. As a result of the measurement, it was confirmed that there was no abnormality in the dry film formed using the compositions of Examples 1 and 2, and it was confirmed that peeling occurred in the dry film formed using the compositions of Comparative Examples 2 and 4.

8. Acid resistance measurement: The acid resistance of the dried coating film formed with the paint composition of Examples 1 and 2 and Comparative Examples 1 to 4 was measured using the KSM ISO 2812-1 test method. The measurement was performed by leaving the sample in a 5% hydrochloric acid (HCl) aqueous solution for 72 hours to check whether immersion peeling occurred. As a result of the measurement, it was confirmed that there was no abnormality in the dry film formed using the compositions of Examples 1 and 2, and it was confirmed that peeling occurred in the dry film formed using the compositions of Comparative Examples 2 and 4.

9. Hardness measurement: The hardness of the dried film formed with the paint composition of Examples 1 and 2 and Comparative Examples 1 to 4 was measured using the KS D 6711 pencil hardness measurement test method. It was confirmed whether each formed coating film was HB or higher. As a result of the measurement, it was confirmed that the dry film formed using the composition of the example had a hardness of HB, which confirmed that the hardness was superior to that of Comparative Examples 1 to 4.

[Table 9] below shows the results of measuring the above performance items. Here, the temperature difference (℃) compared to the unpainted surface represents the difference between the temperature of the unpainted surface (T _A ) and the temperature of the painted surface (T _B ) after 40 minutes.

NO Performance items Performance Example 1 Example 2 Comparative Example 1 Comparative example 2 Comparative example 3 Comparative Example 4 One Thermal conductivity (W/m·K) 7 7 2.4 5.2 4.2 6.1 2 Temperature difference compared to unpainted coating (℃) 9~14 9~14 2~4 6~10 6~8 8~12 3 Dielectric strength (KV/mil) 0.5 0.5 0.1 0.25 0.35 0.3 4 Adhesion (adhesion) 5B 5B 4B 2B 5B 3B 5 impact resistance pass pass pass fail pass fail 6 Salt spray resistance No rusting No rusting No rusting Rusting occurs No rusting Rusting occurs 7 Alkali resistance clear clear clear Peeling occurs clear Peeling occurs 8 acid resistance clear clear clear Peeling occurs clear Peeling occurs 9 Hardness HB HB B 2B B H

<Measurement of fire extinguishing performance after dry film formation>

It was made of plastic measuring 160mm wide, 210mm long, and 210mm high, and a burner was fixed and ignited inside a square cylinder with an open top.

One surface on which the dry coating film of Examples 1 and 2 was formed was sealed by covering the open upper surface so that the flame of the burner was in contact with the surface, and then the following temperatures and times were measured while the flame of the burner was sealed.

Here, the initial extinguishing self-sensing temperature is measured using a digital thermometer when the microcapsule reacts when the burner flame contacts the surface.

The above test was performed in the same manner for Comparative Examples 1 to 4.

The measurement results were as shown in [Table 10] below.

Metrics unit Example 1 Example 2 Comparative Example 1 Comparative example 2 Comparative example 3 Comparative example 4 Initial fire extinguishing self-sensing temperature ℃ 130 130 135 150 320 135 Initial fire extinguishing time candle 5 5 6 8 Not measurable 7 Reburn suppression time candle 12 12 14 16 Not measurable 15

In the case of Comparative Example 1, the ratio of the total content of the first inorganic filler to the content of microcapsules is less than 1.5, so the purpose of suppressing the initial fire may be sufficiently achieved, but the heat dissipation performance is relatively poor compared to Examples 1 and 2. It was confirmed that it was falling.

In the case of Comparative Example 2, the ratio of the total content of the first inorganic filler to the content of microcapsules exceeded 3.5, which confirmed the problem that the fire extinguishing effect of the initial fire was reduced.

In the case of Comparative Example 3, it was confirmed that the content of microcapsules was 5% by weight or less compared to the weight of the main substance, so there was almost no initial fire extinguishing effect.

In the case of Comparative Example 4, the hardener part was included in an amount of 30% by weight or more based on the total weight of the paint composition, so that the functions of the coating film, such as insulation, adhesion, impact resistance, salt spray resistance, alkali resistance, and acid resistance, were reduced as shown in [Table 7]. The problem has been confirmed.

In other words, the coating film formed through the coating composition for heat dissipation and initial fire extinguishing of the present invention has excellent physical properties such as insulation, adhesion, impact resistance, salt spray resistance, alkali resistance, and acid resistance, and exhibits a thermal conductivity of 7 W/m·K or more. It can have excellent initial fire extinguishing performance along with heat dissipation performance.

10: NH microcapsule for initial fire extinguishing
20: first inorganic filler
20-1: Boron nitride
20-2: Silicon carbide
20-3: Aluminum nitride
30: Second inorganic filler
40: covered object
10a: Microcapsule for initial fire extinguishing
20a: First inorganic filler heat dissipation layer
30a: Second inorganic filler undercoat layer

Claims (9)

In the paint composition for heat dissipation and initial fire extinguishing comprising a main part and a hardener part,
The main part includes (a) a thermoplastic acrylic resin, (b) a first inorganic filler, (c) a second inorganic filler, and (d) a microcapsule for extinguishing an initial fire,
The weight-based mixing ratio of (a) the thermoplastic acrylic resin, (b) the first inorganic filler, and (c) the second inorganic filler is (a): (b) + (c) = 1: 0.7 ~ 1: 1,
(d) Microcapsules for initial fire extinguishing contain 5 to 15% by weight based on the weight of the subject,
A paint composition for heat dissipation and initial fire extinguishing wherein the hardener part is contained in an amount of 15 to 30% by weight based on the total weight of the paint composition. According to paragraph 1,
A paint composition for heat dissipation and initial fire extinguishing wherein the mixing ratio by weight of (b) the first inorganic filler and (c) the second inorganic filler is (b): (c) = 2:1 to 4:1. According to paragraph 1,
The first inorganic filler is a paint composition for heat dissipation and initial fire extinguishing, wherein the first inorganic filler is at least one selected from boron nitride, silicon carbide, and aluminum nitride. According to paragraph 3,
A paint composition for heat dissipation and initial fire extinguishing wherein the first inorganic filler includes boron nitride, silicon carbide, and aluminum nitride, and is contained in an amount of 20 to 30% by weight based on the weight of the main material. According to paragraph 3,
The first inorganic filler includes boron nitride, silicon carbide, and aluminum nitride,
The boron nitride has an average particle diameter of 45 to 280㎛,
The silicon carbide has an average particle diameter of 10 to 40㎛,
The aluminum nitride is a paint composition for heat dissipation and initial fire extinguishing with an average particle diameter of 30 to 80㎛. According to paragraph 1,
The second inorganic filler is a paint composition for heat dissipation and initial fire extinguishing, wherein the second inorganic filler is at least one of micro-calcined alumina, micro-calcined silica, and micro-calcined zinc phosphate. According to paragraph 1,
The second inorganic filler includes micro-calcined alumina, micro-calcined silica, and micro-calcined zinc phosphate, and is contained in an amount of 5 to 10% by weight based on the weight of the main material. A coating composition for heat dissipation and initial fire extinguishing. According to paragraph 1,
A paint composition for heat dissipation and initial fire extinguishing, wherein the initial fire extinguishing microcapsules have a core-shell structure. According to paragraph 1,
A paint composition for heat dissipation and initial fire extinguishing wherein the average particle diameter of the microcapsules for extinguishing initial fire is 60 to 80㎛.