CN111269592A - Heat dissipation coating composition - Google Patents
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
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- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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Abstract
The invention discloses a heat dissipation coating composition which comprises graphene and ceramic particles, wherein the weight ratio of the graphene to the ceramic particles is 10:1-1: 5. The heat dissipation coating composition is coated on the surface of a base material through the modes of spraying, scraper coating, screen printing, electroplating and the like to form a heat dissipation coating which has good heat dissipation performance, the heat dissipation efficiency is as high as 500-2000W/m.K, and the tolerance temperature range is wide and can reach-50 ℃ to 500 ℃.
Description
Technical Field
The present invention relates to a composition, and more particularly, to a heat-dissipating coating composition.
Background
In life and production, a lot of products or environments can be subjected to the situation that heat (energy) needs to be emitted, for example, products using heat energy (such as an electric heater, an electric cooker, an electric oven, a high-temperature kiln and the like) or products needing to discharge more waste heat energy in time (such as mobile phone heat dissipation, laser heat dissipation and the like). In the existing technology, the product using heat energy often has the problems of uneven heating and the like, which greatly influences the heating effect of the product in the using process. For example, in an electric cooker, uneven heating can easily cause the situation that cooked food is half-cooked or burnt. Products which need to discharge excessive heat often cannot discharge the excessive heat in time, so that internal devices of the products are burnt out or the performance of the products is directly influenced.
The existing heat dissipation modes of products needing heat dissipation have modes such as air cooling and water cooling, and although the heat dissipation modes can achieve good heat dissipation effects, required equipment is complex, a large amount of space is occupied, and much inconvenience is brought to the using process. Some products needing heat dissipation adopt the form of heat dissipation coatings to dissipate heat, and compared with modes such as air cooling, water cooling and the like, the heat dissipation coatings have limited heat dissipation effects and a large amount of heat is difficult to dissipate. In addition, the heat resistance of many heat dissipation coatings at present is limited, and the heat dissipation coatings are difficult to bear the high temperature of more than 200 ℃, which also limits the application of the heat dissipation coatings in many high temperature fields.
Graphene as a high-heat-conducting material can realize 5300W/K.m under ideal conditions2The thermal conductivity of (A) can reach 1000W/K.m under normal conditions2The above values are the best heat conducting properties among all the materials at present. Although the temperature resistance of the graphene can reach thousands of degrees centigrade, when the heat dissipation coating prepared by compounding the graphene and other materials is coated on a substrate such as glass, metal, ceramic and the like, the heat dissipation coating can only work at the temperature below 200 ℃, and the heat released by a heat source is uniformly dissipated to the surrounding environment. When the graphene composite heat dissipation coating is used under a higher temperature condition, the composite coating can be softened and decomposed to be difficult to continue to use (for example, the Chinese patent publication No. CN108165120A relates to the preparation of a coating by mixing graphene with a dispersing agent, an adhesive and a thickening agent, and the coating is used for heat dissipation of an air conditioner, the working temperature does not exceed 60 ℃, the Chinese utility model patent No. CN208143610U relates to the preparation of graphene into a graphene heat dissipation coating which is used for a plastic insulation shell, the working temperature does not exceed 200 ℃, and for some products and environments needing heat dissipation at higher temperature, the schemes in the prior art cannot meet the current requirements.
Therefore, a heat dissipation coating with good heat dissipation performance and wide temperature tolerance range is needed.
Disclosure of Invention
Aiming at the problems of the heat dissipation coating in the prior art, the invention aims to provide a heat dissipation coating composition, and the heat dissipation coating formed by the composition has high heat dissipation efficiency and wider temperature tolerance range. The heat dissipation efficiency can reach 500-2000W/m.K, and the tolerance temperature range can reach-50 ℃ to 500 ℃.
In order to realize the purpose of the invention, the technical scheme adopted by the invention is as follows:
the heat dissipation coating composition comprises graphene and ceramic particles, wherein the weight ratio of the graphene to the ceramic particles is 10:1-1: 5.
In a more preferred embodiment, in the heat dissipation coating composition of the present invention, the weight ratio of the graphene to the ceramic particles is 5:1 to 1: 2. In a more preferred embodiment, the weight ratio of the graphene to the ceramic particles in the heat dissipation coating composition of the present invention is 2.5: 1.
In a preferred embodiment, the heat-dissipating coating composition of the present invention further comprises a binder.
In a preferred embodiment, the heat-dissipating coating composition of the present invention further comprises a solvent.
In a preferred embodiment, the heat-dissipating coating composition of the present invention comprises the following components by weight:
in a preferred embodiment, in the heat-dissipating coating composition of the present invention, the graphene has a particle size of 5 to 30 μm,
in a preferred embodiment, the number of layers of graphene in the heat-dissipating coating composition of the present invention is 1 to 10 atomic layers. In a more preferred embodiment, the number of layers of graphene is 3 atomic layers.
In a preferred embodiment, in the heat-dissipating coating composition of the present invention, the ceramic particles have a particle size ranging from 30nm to 10 μm.
In a preferred embodiment, in the heat-dissipating coating composition of the present invention, the ceramic particles are selected from one or more of boron nitride, aluminum oxide, aluminum nitride, silicon carbide, magnesia alumina spinel powder, aluminum oxynitride, zirconium dioxide, quartz, zirconium diboride.
In a preferred embodiment, in the heat-dissipating coating composition of the present invention, the binder is selected from the group consisting of high temperature resistant epoxy resins and/or high temperature resistant silicone resins.
In a preferred embodiment, in the heat-dissipating coating composition of the present invention, the solvent is selected from one or more of acetone, ethanol, ethylene glycol, isopropyl alcohol, ethyl acetate, N-methylpyrrolidone, and butyl cellosolve acetate.
In a preferred embodiment, the heat-dissipating coating composition of the present invention consists of the following components: 1% of graphene with the grain diameter of 30 mu m, 1% of aluminum oxide ceramic with the grain diameter of 1 mu m and 1% of silicon dioxide particles with the grain diameter of 1:1, 0.5% of A-186 silane coupling agent and 97.5% of ethanol solvent. In a preferred embodiment, the heat-dissipating coating composition of the present invention consists of the following components: 20% of graphene with the particle size of 5 microns, 5% of boron nitride ceramic particles with the particle size of 5 microns, 1.5% of diallyl phthalate and 73.5% of ethanol and ethylene glycol mixed solvent in a weight ratio of 1: 1. In a preferred embodiment, the heat-dissipating coating composition of the present invention consists of the following components: 1% of graphene with the particle size of 5 mu m, 1% of aluminum nitride particles with the particle size of 30nm, 1.5% of E-51 epoxy resin and 96.5% of N-methylpyrrolidone solvent. In a preferred embodiment, the heat-dissipating coating composition of the present invention consists of the following components: 10 percent of graphene with the grain diameter of 30 mu m, 2 percent of silicon carbide with the grain diameter of 500nm and magnesium aluminate spinel with the grain diameter of 1 mu m in a weight ratio of 1:1, 0.5 percent of ethyl orthosilicate and 87.5 percent of ethanol solvent. In a preferred embodiment, the heat-dissipating coating composition of the present invention consists of the following components: 1% of graphene with the particle size of 15 microns, 2% of aluminum oxynitride particles with the particle size of 10 microns, 0.5% of A-186 silane coupling agent and 96.5% of isopropanol solvent. In a preferred embodiment, the heat-dissipating coating composition of the present invention consists of the following components: 5% of graphene with the particle size of 20 microns, 2% of zirconium dioxide particles with the particle size of 5 microns, 1% of E-51 epoxy resin and 92% of acetone solvent. In a preferred embodiment, the heat-dissipating coating composition of the present invention consists of the following components: 5% of graphene with the particle size of 10 mu m, 2% of zirconium diboride particles with the particle size of 500nm, 1% of diallyl phthalate and 92% of water solvent. In a preferred embodiment, the heat-dissipating coating composition of the present invention consists of the following components: 8% of graphene with the particle size of 10 microns, 2% of quartz particles with the particle size of 1 micron, 1% of ethyl orthosilicate and 89% of water solvent.
The heat dissipation coating composition can be coated on the surface of a base material by any one of spraying, scraper coating, screen printing, electroplating and the like, then dried for 20-40 minutes at room temperature, then placed in a 60-100 ℃ drying oven for heating and drying, and further dried for 1-3 hours in a 180-300 ℃ drying oven.
In the description of the present invention, the substrate material includes, but is not limited to, metal, ceramic, and glass.
In the composition, the used ceramic particles have good high temperature resistance, so that a coating formed by the composition can resist high temperature, and the used graphene has good heat-conducting property, so that the coating formed by the composition has good heat-conducting property. In addition, the surface of the ceramic particles comprises oxygen-containing functional groups. The graphene surface comprises functional groups such as hydroxyl, carboxyl and the like, and the oxygen-containing functional groups on the surface of the ceramic particles and the functional groups such as hydroxyl, carboxyl and the like on the surface of the graphene undergo dehydration reaction in the heating process, so that the coating formed by the ceramic particle material and the graphene has strong and firm bonding force. The binder component assists the graphene and the ceramic material to be uniformly dispersed, and meanwhile, the coating can be firmly attached to various substrate materials in the coating process. In the drying process, the binder mainly plays a role in binding, and after drying, due to the fact that the ceramic material and the graphene are firmly connected to form a compact film, the graphene and the ceramic are mainly connected when the ceramic material and the graphene are used in a high-temperature environment of 300-500 ℃ in the later period.
Compared with the existing heat dissipation coating, the heat dissipation coating composition provided by the invention can be applied to the surface of a base material to form a coating which can be used in a low-temperature environment of-50 ℃ or a high-temperature environment of 500 ℃ and has good heat dissipation performance.
Drawings
Fig. 1 is a schematic structural view of a metal plate coated with a heat-dissipating coating layer on its surface prepared in example 1, in which 1 denotes a metal plate body and 2 denotes a coating layer.
Fig. 2a is a schematic view showing an interior micro-scale of a coating layer formed by the heat-dissipating coating composition applied to the surface of the metal plate of example 1 before being dried, and fig. 2b is a schematic view showing an interior micro-scale of a coating layer formed by the heat-dissipating coating composition applied to the surface of the metal plate of example 1 after being dried. Where the lines represent the bonding composition, the round black dots are ceramic particles, and the square bars are graphene sheets.
Fig. 3a and 3b are respectively a heat diagram of the areas above the coated metal plate and the uncoated metal plate, which are formed after coating the composition of the present invention, and which are respectively measured at equal distances when they are heated on a gas burner by a big fire, using an infrared detector, wherein the temperature increases from blue to red. The maximum temperature of the entire detection zone in fig. 3a is 472.2 ℃, the minimum temperature is 27.0 ℃, and the temperature at the location of the icon is 470.8 ℃; the maximum temperature of the entire detection zone in fig. 3b is 228.9 deg.c, the minimum temperature is 37.1 deg.c and the temperature at the location of the graph is 207.6 deg.c. The comparison of the two figures shows that the graphene coating can quickly and effectively transmit the temperature of a fire to the surface of the coating and dissipate heat.
Detailed Description
In the description of the present invention, percent (%) means weight percent unless otherwise specified.
In the description of the present invention, "plural" means two or more.
In order to make the technical means, the creation features, the achievement purposes and the effects of the invention easy to understand, the invention will be further described in detail through the embodiments. It is obvious that the embodiments described below are only some of the embodiments of the present invention, and that those skilled in the art will be able to derive other embodiments from the embodiments without the exercise of inventive faculty.
Example 1
1.1 the composition of the heat-dissipating coating composition is:
1.2 preparation of Heat-dissipating coating
The components are fully mixed and stirred to prepare uniform slurry. And spraying the prepared slurry on microcrystalline glass in a spraying manner, airing at room temperature for 30 minutes, then placing in an oven at 80 ℃ for heating and drying, and further drying in the oven at 230 ℃ for 2 hours.
1.3 verification of temperature resistance of Heat-dissipating coating
And (3) placing the microcrystalline glass plate coated with the heat dissipation coating in a furnace at 300 ℃ for heating and baking for more than 7 days, wherein the heat dissipation coating has no change. The heat dissipation coating is still free from damage and shedding after being frozen for 7 days by liquid nitrogen. The long-term tolerance temperature of the heat dissipation coating can reach-50 to 300 ℃.
Example 2
2.1 composition of Heat-dissipating coating composition
2.2 preparation of Heat-dissipating coating
The components are fully mixed and stirred to prepare uniform slurry. The prepared slurry is respectively sprayed on a microcrystalline glass plate and a metal plate in a spraying mode, aired for 30 minutes at room temperature, then placed in an oven at 80 ℃ for heating and drying, and further dried for 2 hours in the oven at 230 ℃.
2.3 verification of temperature resistance of Heat-dissipating coating
And (2) placing the microcrystalline glass plate coated with the heat dissipation coating in a 300 ℃ furnace for heating and baking for over 7 days, wherein the heat dissipation coating has no change, placing the metal plate coated with the heat dissipation coating in a 500 ℃ furnace for heating and baking for 1h, wherein the coating has no change, and freezing for 7 days by using liquid nitrogen, and the coating still has no damage and falling condition. The long-term tolerance temperature of the heat dissipation coating can reach-50 to 300 ℃, and the short-term tolerance temperature can reach 500 ℃.
Example 3
3.1 composition of Heat-dissipating coating composition
3.2 preparation of Heat-dissipating coating
The components are fully mixed and stirred to prepare uniform slurry. And spraying the prepared slurry on a microcrystalline glass plate in a spraying manner, airing for 30 minutes at room temperature, then placing the microcrystalline glass plate in an oven at 80 ℃ for heating and drying, and further drying in the oven at 230 ℃ for 2 hours.
3.3 verification of temperature resistance of Heat-dissipating coating
And (3) placing the microcrystalline glass plate coated with the heat dissipation coating in a furnace at 300 ℃ for heating and baking for more than 7 days, wherein the heat dissipation coating has no change. The heat dissipation coating is still free from damage and shedding after being frozen for 7 days by liquid nitrogen. The long-term tolerance temperature of the heat dissipation coating can reach-50 to 300 ℃.
Example 4
4.1 composition of Heat-dissipating coating composition
4.2 preparation of Heat-dissipating coating
The components are fully mixed and stirred to prepare uniform slurry. The prepared slurry can be coated on a microcrystalline glass plate and a metal plate by a brush coating mode, the microcrystalline glass plate and the metal plate are firstly aired for 30 minutes at room temperature, then are placed in an oven with the temperature of 80 ℃ for heating and drying, and then are further dried in the oven with the temperature of 230 ℃ for 2 hours.
4.3 verification of temperature resistance of Heat-dissipating coating
And (3) placing the microcrystalline glass plate coated with the heat dissipation coating in a furnace at 300 ℃ for heating and baking for more than 7 days, wherein the heat dissipation coating has no change. And (3) placing the metal plate coated with the coating in a furnace at 500 ℃ for heating and baking for 1h, wherein the heat dissipation coating is unchanged. The heat dissipation coating is still free from damage and shedding after being frozen for 7 days by liquid nitrogen. The long-term tolerance temperature of the heat dissipation coating can reach-50 to 300 ℃, and the short-term tolerance temperature can reach 500 ℃.
Example 5
5.1 composition of Heat-dissipating coating composition
5.2 preparation of Heat-dissipating coating
The components are fully mixed and stirred to prepare uniform slurry. And spraying the prepared slurry on microcrystalline glass in a spraying manner, airing at room temperature for 30 minutes, then placing in an oven at 80 ℃ for heating and drying, and further drying in the oven at 230 ℃ for 2 hours.
5.3 verification of temperature resistance of Heat dissipation coating
And (3) placing the microcrystalline glass plate coated with the heat dissipation coating in a furnace at 300 ℃ for heating and baking for more than 7 days, wherein the coating still has no damage and shedding condition. The long-term temperature tolerance of the heat dissipation coating can reach 300 ℃.
Example 6
6.1 composition of Heat-dissipating coating composition
6.2 preparation of Heat-dissipating coating
The components are fully mixed and stirred to prepare uniform slurry. The prepared slurry can be sprayed on a microcrystalline glass plate substrate in a spraying mode, is dried for 30 minutes at room temperature, is heated and dried in an oven at 80 ℃, and is further dried for 2 hours in an oven at 230 ℃.
6.3 verification of temperature resistance of Heat dissipation coating
And (3) placing the microcrystalline glass plate coated with the heat dissipation coating in a furnace at 300 ℃ for heating and baking for more than 7 days, wherein the heat dissipation coating has no change. The heat dissipation coating is still free from damage and shedding after being frozen for 7 days by liquid nitrogen. The long-term tolerance temperature of the heat dissipation coating can reach-50 to 300 ℃.
Example 7
7.1 composition of Heat-dissipating coating composition
7.2 preparation of Heat-dissipating coating
The components are fully mixed and stirred to prepare uniform slurry. And respectively spraying the prepared slurry on a microcrystalline glass plate and a metal substrate in a spraying mode, airing at room temperature for 30 minutes, then placing in an oven at 80 ℃ for heating and drying, and further drying in the oven at 230 ℃ for 2 hours.
7.3 verification of temperature resistance of Heat dissipation coating
And (3) placing the microcrystalline glass plate coated with the heat dissipation coating in a furnace at 300 ℃ for heating and baking for more than 7 days, wherein the heat dissipation coating has no change. And (3) placing the metal plate sprayed with the coating in a furnace at 500 ℃ for heating and baking for 1h, wherein the heat dissipation coating is unchanged. The heat dissipation coating is still free from damage and shedding after being frozen for 7 days by liquid nitrogen. The short-term tolerance temperature of the heat dissipation coating can reach 500 ℃, and the long-term tolerance temperature can reach-50 ℃ to 300 ℃.
Example 8
8.1 composition of Heat-dissipating coating composition
8.2 preparation of Heat-dissipating coating
The components are fully mixed and stirred to prepare uniform slurry. And respectively spraying the prepared slurry on a microcrystalline glass plate and a metal substrate in a spraying mode, airing at room temperature for 30 minutes, then placing in an oven at 80 ℃ for heating and drying, and further drying in the oven at 230 ℃ for 2 hours.
8.3 verification of temperature resistance of Heat dissipation coating
And (2) placing the microcrystalline glass plate coated with the heat dissipation coating in a 300 ℃ furnace for heating and baking for over 7 days, wherein the heat dissipation coating has no change, placing the metal plate coated with the coating in a 500 ℃ furnace for heating and baking for 1h, wherein the heat dissipation coating has no change, and freezing for 7 days by using liquid nitrogen, so that the coating still has no damage and shedding condition. The short-term tolerance temperature of the heat dissipation coating can reach 500 ℃, and the long-term tolerance temperature can reach-50 ℃ to 300 ℃.
Comparative example 1
The existing graphene heat dissipation composite coating (comprising 5% of graphene, 30% of polyurethane and 65% of N-methyl pyrrolidone) is purchased to prepare uniform slurry, the prepared slurry is sprayed on a microcrystalline glass plate in a spraying mode, the microcrystalline glass plate is aired for 30 minutes at room temperature, and then the microcrystalline glass plate is placed in a 110 ℃ oven to be heated and dried for 0.5 hour.
The microcrystalline glass plate coated with the heat dissipation coating is placed in a furnace at 300 ℃ for heating and baking, the coating is decomposed and damaged at the temperature, the coating is frozen by liquid nitrogen, the coating cracks seriously instantly and falls off from the microcrystalline glass plate, and the intolerable temperature can reach-50-300 ℃.
The heat dissipation coating is coated on a copper foil substrate, then the copper foil substrate is placed in a heat conduction tester for detection, and the influence of heat dissipation of the copper foil substrate is removed through calculation of a test result, so that the heat dissipation efficiency of each embodiment and comparative example is obtained (see table 1).
TABLE 1 Heat dissipation efficiency of each of examples and comparative examples
| Examples | Heat radiation efficiency W/K.m2 |
| 1 | 500 |
| 2 | 2000 |
| 3 | 1800 |
| 4 | 1000 |
| 5 | 1500 |
| 6 | 800 |
| 7 | 1500 |
| 8 | 1800 |
| Comparative example 1 | 400 |
The embodiment shows that the heat dissipation coating composition provided by the invention has good heat dissipation performance and wide temperature tolerance range, so that the formed coating is practical for various base materials and environmental temperatures, the cost of the used materials is low, the process for forming the coating is simple, and the heat dissipation coating composition has very practical value and wide market.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. A heat-dissipating coating composition characterized by: the heat dissipation coating composition comprises graphene and ceramic particles, wherein the weight ratio of the graphene to the ceramic particles is 10:1-1: 5.
2. The heat-dissipating coating composition of claim 1, further comprising a binder.
3. The thermal dissipation coating composition of claim 2, further comprising a solvent.
4. The heat-dissipating coating composition according to claim 3, comprising the following components by weight:
5. the heat-dissipating coating composition according to any one of claims 1 to 4, wherein the graphene has a particle size of 5 to 30 μm.
6. The thermal spreading coating composition of any one of claims 1-4, wherein the ceramic particles are selected from one or more of boron nitride, aluminum oxide, aluminum nitride, silicon carbide, magnesia alumina spinel powder, aluminum oxynitride, zirconium dioxide, quartz, zirconium diboride.
7. The heat-dissipating coating composition of any one of claims 1 to 4, wherein the binder is selected from the group consisting of high temperature epoxy resins and/or high temperature silicone resins.
8. The heat-dissipating coating composition of any one of claims 1 to 4, wherein the solvent is selected from one or more of acetone, ethanol, ethylene glycol, isopropyl alcohol, ethyl acetate, N-methylpyrrolidone, and butyl cellosolve acetate.
9. The heat-dissipating coating composition according to any one of claims 1 to 4, wherein the heat-dissipating coating composition forms a coating having a temperature resistance ranging from-50 ℃ to 500 ℃.
10. The heat-dissipating coating composition according to any one of claims 1 to 4, wherein the heat-dissipating coating composition has a heat-dissipating efficiency per unit thickness of 500 to 2000W/m-K.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114411080A (en) * | 2021-12-29 | 2022-04-29 | 钢铁研究总院 | Thermal protection composite coating and manufacturing method thereof |
| CN115605009A (en) * | 2022-12-14 | 2023-01-13 | 荣耀终端有限公司（Cn） | Middle frame, electronic equipment and preparation method of middle frame |
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| CN111269592B (en) | 2022-07-08 |
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