High-temperature-resistant graphite heat-dissipating coating, preparation method and application thereof

Abstract

The application provides a high-temperature-resistant graphite heat-dissipation coating and an application thereof. The coating is sprayed on various metal heat-dissipation structures in need of high-temperature resistance by a spraying method, and comprises a base layer and a heat-dissipation layer. The base layer comprises a contact part in contact with a heat source and an upper heat-dissipation part. The contact part is a horizontal plane, and the heat-dissipation part has a special-shaped structure or an irregular structure. The heat-dissipation layer is covered on the heat-dissipation part by the spraying method. The heat-dissipation structure forms a high-temperature-resistant heat-dissipation coating on the base layer by the spraying method. Even for the heat-dissipation part with a plane or a complex structure, such as a special-shaped structure or an irregular structure, the heat-dissipation layer can be uniformly covered on the base layer, the heat-dissipation and high-temperature-resistant effects of the heat-dissipation structure are greatly improved, and the spraying method can reduce the overall cost and facilitate processing.

Description

Technical Field

[0001] This invention relates to the field of heat dissipation coatings, and in particular to a high-temperature resistant graphene heat dissipation coating, its preparation method, and its application. Background Technology

[0002] With the advancement of technology, the functions of electronic components are gradually becoming more advanced, thus increasing the requirements for heat dissipation components. Most heat dissipation components include heat dissipation structures that are in direct contact with the heat source and heat dissipation devices that connect to the heat dissipation structure. The heat dissipation device transfers the heat source to the heat transfer tube on the heat dissipation structure. However, general heat dissipation coatings can only withstand temperatures below 200 degrees Celsius. If the temperature is too high, ordinary coatings will blister, peel off, and carbonize, failing to meet the high temperature resistance requirements above 200 degrees Celsius. Therefore, a graphene coating that can withstand high temperatures of 600 degrees Celsius and achieve heat dissipation function has been developed, along with excellent weather resistance and chemical resistance. Summary of the Invention

[0003] The purpose of this invention is to provide a high-temperature resistant graphene heat dissipation coating and its application, which at least partially solves the technical problem that general heat dissipation coatings used on electronic components in the prior art can only withstand temperatures up to 200 degrees Celsius, while ordinary coatings will blister, peel off, and carbonize when the temperature is too high.

[0004] To solve the above-mentioned technical problems, the first aspect of the present invention provides a high-temperature resistant graphene heat dissipation coating, characterized in that it comprises: organosilicon modified resin, polyester resin, carbon black, graphene, and modified nano carbon.

[0005] Optionally, it may also include: a cosolvent, a wetting agent, a dispersant, a leveling agent, and silica.

[0006] Optionally, the components of the coating are as follows by weight: organosilicon modified resin: 40-55 parts by weight; polyester resin: 5-10 parts by weight; co-solvent: 20-30 parts by weight; wetting agent: 0.1-1 parts by weight; dispersant: 1-2 parts by weight; graphene: 1-5 parts by weight; leveling agent: 0.1-1 parts by weight; carbon black: 1-4 parts by weight; modified nano-carbon: 1-4 parts by weight; and silicon dioxide: 1-4 parts by weight.

[0007] Optionally, the components of the coating are as follows by weight: organosilicon modified resin: 35-45 parts by weight; polyester resin: 10-15 parts by weight; co-solvent: 25-30 parts by weight; wetting agent: 0.2-1 parts by weight; dispersant: 1-2 parts by weight; graphene: 0.2-2 parts by weight; leveling agent: 0.3-1 parts by weight; carbon black: 3-5 parts by weight; modified nano-carbon: 2-5 parts by weight; and silicon dioxide: 3-5 parts by weight.

[0008] Optionally, the particle size of the modified nano-carbon can be selected as 1–100 nm.

[0009] Optionally, the co-solvent may be sodium benzoate, sodium salicylate, p-aminobenzoic acid, ethanol, or citric acid.

[0010] Optionally, the wetting agent may be: polyethylene oxide alkyl phenyl ether or polyethylene oxide fatty acid ester.

[0011] Optionally, the dispersant may be sodium tripolyphosphate, sodium hexametaphosphate, sodium pyrophosphate, or fatty acid polyethylene glycol ester.

[0012] Optionally, it also includes: the leveling agent is silicone oil, polyether polyester modified organosiloxane or polydimethylsiloxane; and / or, the silica is fumed silica or precipitated silica.

[0013] To solve the technical problem, a second aspect of the present invention provides a coating for electronic components, wherein the coating is formed by spraying a high-temperature resistant graphene heat dissipation coating as described in any of the preceding claims onto the heat dissipation portion of a high-temperature resistant structure.

[0014] To address the technical problem, a third aspect of the present invention provides a method for preparing the high-temperature resistant graphene heat dissipation coating described in any of the preceding claims, comprising: mixing the organosilicon-modified resin, polyester resin, carbon black, graphene, and modified nano-carbon according to predetermined component weight parts.

[0015] The high-temperature resistant graphene heat dissipation coating of this invention can withstand temperatures up to 600 degrees Celsius. This novel 600-degree Celsius high-temperature resistant graphene heat dissipation coating incorporates organosilicon-modified resin, polyester resin, carbon black, graphene, and modified nano-carbon. It can be sprayed onto various metal and electronic components requiring heat dissipation and high-temperature resistance. The coating includes a base layer and a heat dissipation layer. The base layer includes a contact portion that contacts the heat source and a heat dissipation portion above it. The contact portion is horizontal, and the heat dissipation portion has an irregular or irregular shape. The heat dissipation layer covers the heat dissipation portion by spraying. The heat dissipation structure forms a high-temperature resistant heat dissipation coating on top of the base layer through spraying. Even for planar or complex heat dissipation portions, such as irregular or irregular structures, the heat dissipation layer can be uniformly covered above the base layer, greatly improving the heat dissipation and high-temperature resistance of the heat dissipation structure. Moreover, the spraying method results in low overall cost and convenient processing. Detailed Implementation

[0016] The features and exemplary embodiments of various aspects of the present invention will now be described in detail. To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are only configured to explain the present invention and are not configured to limit the present invention. For those skilled in the art, the present invention can be practiced without some of these specific details. The following description of the embodiments is merely to provide a better understanding of the present invention by illustrating examples of the invention.

[0017] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes said element.

[0018] One composition of the coating of the present invention includes: organosilicon modified resin, polyester resin, carbon black, graphene, and modified nano-carbon. It further includes: a co-solvent, a wetting agent, a dispersant, a leveling agent, and silica. Preferably, the weight parts of each component are: (1) organosilicon modified resin: 40-55 parts by weight; polyester resin: 5-10 parts by weight; co-solvent: 20-30 parts by weight; wetting agent: 0.1-1 parts by weight; dispersant: 1-2 parts by weight; graphene: 1-5 parts by weight; leveling agent: 0.1-1 parts by weight; carbon black: 1-4 parts by weight; modified nano-carbon: 1-4 parts by weight; silica: 1-4 parts by weight. Another preferred embodiment has the following components by weight: (2) Organosilicon modified resin: 35-45 parts by weight; polyester resin: 10-15 parts by weight; cosolvent: 25-30 parts by weight; wetting agent: 0.2-1 parts by weight; dispersant: 1-2 parts by weight; graphene: 0.2-2 parts by weight; leveling agent: 0.3-1 parts by weight; carbon black: 3-5 parts by weight; modified nano carbon: 2-5 parts by weight; silicon dioxide: 3-5 parts by weight.

[0019] Example 1 In one embodiment of the present invention, a high-temperature resistant graphene heat dissipation coating is a novel material resistant to temperatures up to 600 degrees Celsius. It comprises: organosilicon-modified resin, polyester resin, carbon black, graphene, and modified nano-carbon.

[0020] In this embodiment, the Si-O bonds in the organosilicon molecules have high bond energy, making them far more resistant to degradation from ultraviolet light, ozone, wind, and rain than the C-O bonds in traditional resins. After addition, the coating film can maintain its gloss, color, and mechanical properties for a long time, significantly extending its outdoor service life.

[0021] Polyester resin molecules contain polar ester groups, which have good compatibility with pigments, fillers and substrates (such as metals and wood), and can form a continuous and uniform coating film with high gloss and a smooth appearance.

[0022] The particle size of carbon black is between 100 and 600 mesh.

[0023] Modified nano-carbon, also known as altered nano-carbon, refers to nano-carbon that has undergone modification treatment, wherein the particle size of the nano-carbon is 1–100 nm. The modification treatment may include: 1. Localized Chemical Reaction Modification: A treatment agent (coupling agent, organic matter, inorganic matter, etc.) is first added, and then the functional groups on the surface of the nano-carbon react chemically with it to achieve the modification purpose. Localized chemical reaction modification processes mainly include dry and wet methods. The dry method involves sequentially adding nano-carbon powder and a surface modifier to the modifier to perform surface modification.

[0024] 2. Surface Coating Modification: The nano-carbon particles and the coating material are linked through van der Waals forces or physical methods to achieve the modification purpose. A surface modifier or superdispersant is added to the nano-carbon preparation solution. During the production of nano-carbon, the surface modifier is coated onto the surface of the nano-carbon, resulting in the final product existing in the form of uniform particles.

[0025] 3. Masterbatch Filler Modification: By mixing a certain proportion of resin masterbatch, nano-carbon, and surfactant, the surface of the nano-carbon is modified simultaneously to obtain the masterbatch filler. The masterbatch filler can be: polyethylene wax calcium carbonate masterbatch, irregular polypropylene calcium carbonate masterbatch (APP masterbatch), and resin calcium carbonate masterbatch filler, etc.

[0026] Furthermore, the high-temperature resistant graphene heat dissipation coating also includes: a co-solvent, a wetting agent, a dispersant, a leveling agent, and silica; The following materials can be used as co-solvents: sodium benzoate, sodium salicylate, p-aminobenzoic acid, ethanol, citric acid, etc. Wetting agents can be used: polyethylene oxide alkyl phenyl ethers, polyethylene oxide fatty acid esters, etc. Dispersants can be used: sodium tripolyphosphate, sodium hexametaphosphate, sodium pyrophosphate, fatty acid polyethylene glycol esters, etc. Leveling agents can be used: silicone oil, polyether polyester modified organosiloxanes, polydimethylsiloxanes, etc. Silica can be used: fumed silica or precipitated silica.

[0027] In one example, the weight parts of each component of the high-temperature resistant graphene heat dissipation coating are as follows: Organosilicon modified resin: 40~55 parts by weight; Polyester resin: 5-10 parts by weight; Cosolvent: 20-30 parts by weight; Wetting agent: 0.1~1 parts by weight; Dispersant: 1-2 parts by weight; Graphene: 1-5 parts by weight; Leveling agent: 0.1~1 parts by weight; Carbon black: 1-4 parts by weight; Modified nano-carbon: 1-4 parts by weight; Silicon dioxide: 1-4 parts by weight.

[0028] Example 2 In another example, the weight parts of each component of the high-temperature resistant graphene heat dissipation coating are as follows: Organosilicon modified resin: 35~45 parts by weight; Polyester resin: 10-15 parts by weight; Cosolvent: 25-30 parts by weight; Wetting agent: 0.2~1 parts by weight; Dispersant: 1-2 parts by weight; Graphene: 0.2~2 parts by weight; Leveling agent: 0.3~1 parts by weight; Carbon black: 3-5 parts by weight; Modified nano-carbon: 2-5 parts by weight; Silicon dioxide: 3-5 parts by weight.

[0029] Example 3 The method for preparing the coating involves mixing the organosilicon-modified resin, polyester resin, carbon black, graphene, and modified nano-carbon according to predetermined component weight parts.

[0030] Specifically, the coating is obtained by adding organosilicon-modified resin, polyester resin, carbon black, graphene, and modified nano-carbon, and mixing them according to the weight parts of the components.

[0031] The Si-O bonds in organosilicon molecules have high bond energy, making them far more resistant to degradation from ultraviolet light, ozone, wind, and rain than the C-O bonds in traditional resins. When added, the coating film can maintain its gloss, color, and mechanical properties for a long time, significantly extending its outdoor service life.

[0032] Polyester resin molecules contain polar ester groups, which have good compatibility with pigments, fillers and substrates (such as metals and wood), and can form a continuous and uniform coating film with high gloss and a smooth appearance.

[0033] The particle size of carbon black is between 100 and 600 mesh.

[0034] Modified nano-carbon, also known as altered nano-carbon, refers to nano-carbon that has undergone modification treatment, wherein the particle size of the nano-carbon is 1–100 nm. The modification treatment may include: 3. Localized Chemical Reaction Modification: A treatment agent (coupling agent, organic matter, inorganic matter, etc.) is first added, and then the functional groups on the surface of the nano-carbon react chemically with it to achieve the modification purpose. Localized chemical reaction modification processes mainly include dry and wet methods. The dry method involves sequentially adding nano-carbon powder and a surface modifier to the modifier to perform surface modification.

[0035] 4. Surface Coating Modification: The nano-carbon particles and the coating are linked through van der Waals forces or physical methods to achieve the modification purpose. A surface modifier or superdispersant is added to the nano-carbon preparation solution. During the production of nano-carbon, the surface modifier is coated on the surface of the nano-carbon, so that the final product exists in the form of uniform particles.

[0036] 3. Masterbatch Filler Modification: By mixing a certain proportion of resin masterbatch, nano-carbon, and surfactant, the surface of the nano-carbon is modified simultaneously to obtain the masterbatch filler. The masterbatch filler can be: polyethylene wax calcium carbonate masterbatch, irregular polypropylene calcium carbonate masterbatch (APP masterbatch), and resin calcium carbonate masterbatch filler, etc.

[0037] Furthermore, the high-temperature resistant graphene heat dissipation coating also includes: a co-solvent, a wetting agent, a dispersant, a leveling agent, and silica; The following materials can be used as co-solvents: sodium benzoate, sodium salicylate, p-aminobenzoic acid, ethanol, citric acid, etc. Wetting agents can be used: polyethylene oxide alkyl phenyl ethers, polyethylene oxide fatty acid esters, etc. Dispersants can be used: sodium tripolyphosphate, sodium hexametaphosphate, sodium pyrophosphate, fatty acid polyethylene glycol esters, etc. Leveling agents can be used: silicone oil, polyether polyester modified organosiloxanes, polydimethylsiloxanes, etc. Silica can be used: fumed silica or precipitated silica.

[0038] In one example, the weight parts of each component of the high-temperature resistant graphene heat dissipation coating are as follows: Organosilicon modified resin: 40~55 parts by weight; Polyester resin: 5-10 parts by weight; Cosolvent: 20-30 parts by weight; Wetting agent: 0.1~1 parts by weight; Dispersant: 1-2 parts by weight; Graphene: 1-5 parts by weight; Leveling agent: 0.1~1 parts by weight; Carbon black: 1-4 parts by weight; Modified nano-carbon: 1-4 parts by weight; Silicon dioxide: 1-4 parts by weight.

[0039] In another example, the weight parts of each component of the high-temperature resistant graphene heat dissipation coating are as follows: Organosilicon modified resin: 35~45 parts by weight; Polyester resin: 10-15 parts by weight; Cosolvent: 25-30 parts by weight; Wetting agent: 0.2~1 parts by weight; Dispersant: 1-2 parts by weight; Graphene: 0.2~2 parts by weight; Leveling agent: 0.3~1 parts by weight; Carbon black: 3-5 parts by weight; Modified nano-carbon: 2-5 parts by weight; Silicon dioxide: 3-5 parts by weight.

[0040] Example 4 In this embodiment, the aforementioned high-temperature resistant graphene heat dissipation coating is used as a coating film for electronic components. The coating film is formed by spraying the aforementioned high-temperature resistant graphene heat dissipation coating onto the heat dissipation part of the high-temperature resistant structure.

[0041] This invention relates to a novel high-temperature resistant graphene heat dissipation coating capable of withstanding temperatures up to 600 degrees Celsius. The coating incorporates organosilicon-modified resin, polyester resin, carbon black, graphene, and modified nano-carbon. It can be sprayed onto various metal and electronic components requiring heat dissipation and high-temperature resistance. The coating comprises a base layer and a heat dissipation layer. The base layer includes a contact portion that contacts the heat source and an upper heat dissipation portion. The contact portion is horizontal, while the heat dissipation portion has an irregular or irregular shape. The heat dissipation layer covers the heat dissipation portion through spraying. The heat dissipation structure forms a high-temperature resistant heat dissipation coating on top of the base layer. Even for planar or complex heat dissipation portions, such as irregular or irregular structures, the heat dissipation layer can be uniformly applied to the base layer, significantly improving the heat dissipation and high-temperature resistance of the heat dissipation structure. Furthermore, the spraying method reduces overall cost and simplifies processing.

[0042] The coating prepared by the embodiments of this aspect is subjected to performance testing on the coated items after spraying: ① Adhesion: The object to be coated is placed horizontally, and 10 lines are drawn horizontally and vertically at intervals of about 1 mm on the surface, for a total of 100 grids. After applying 3M tape to the coating, it is quickly pulled up 3 times. The adhesion level is ≥ 4 B. ② High temperature test: The coated object was placed in an oven and baked at 600° for 2 hours. The coating film showed no blistering, cracking, peeling or carbonization. ③ Low temperature storage test: The test temperature is -40℃ for 48 hours. After the test, the coating is allowed to recover for 1-2 hours under standard atmospheric conditions. The coating film shows no blistering, cracking or peeling. ④ High temperature storage test: Test temperature: The maximum storage temperature (+80℃) is maintained for 48 hours. After the test, the coating is allowed to recover for 1-2 hours under standard atmospheric conditions. The coating film should not blister, crack, or peel off. ⑤ High temperature and high humidity: The object to be coated is placed in a constant humidity and temperature chamber and placed at 90% humidity and 70℃ for 72 hours. After standing at room temperature for 6 hours, the coating film is tested and there is no blistering or peeling. ⑥ Salt spray test: Place the coated object on the salt spray test bench and spray it continuously with 5% saline at 35°C for 72 hours. After standing at room temperature for 24 hours, test the coating film. There should be no blistering or peeling. ⑦ Thermal shock: Test temperature: -40℃~+80℃, temperature change time: ≤30s, high and low temperature holding time: 120min, test cycle: 6 cycles.

[0043] It should be clarified that the present invention is not limited to the specific structures and processes described above. For the sake of brevity, detailed descriptions of known methods are omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of the present invention is not limited to the specific steps described and shown. Those skilled in the art can make various changes, modifications, and additions, or change the order of steps, after understanding the spirit of the present invention.

[0044] It should also be noted that the exemplary embodiments mentioned in this invention describe methods or systems based on a series of steps or apparatus. However, this invention is not limited to the order of the steps described above; that is, the steps can be performed in the order mentioned in the embodiments, or in a different order, or several steps can be performed simultaneously.

[0045] The above description is merely a specific embodiment of the present invention. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, modules, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here. It should be understood that the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the protection scope of the present invention.

Claims

1. A high-temperature resistant graphene heat dissipation coating, characterized in that, include: Organosilicon modified resins, polyester resins, carbon black, graphene, and modified nano-carbon.

2. The high-temperature resistant graphene heat dissipation coating according to claim 1, characterized in that, Also includes: Cosolvent, wetting agent, dispersant, leveling agent, silica.

3. The high-temperature resistant graphene heat dissipation coating according to claim 2, characterized in that, The weight parts of each component of the coating are as follows: Organosilicon modified resin: 40~55 parts by weight; Polyester resin: 5-10 parts by weight; Cosolvent: 20-30 parts by weight; Wetting agent: 0.1~1 parts by weight; Dispersant: 1-2 parts by weight; Graphene: 1-5 parts by weight; Leveling agent: 0.1~1 parts by weight; Carbon black: 1-4 parts by weight; Modified nano-carbon: 1-4 parts by weight; Silicon dioxide: 1-4 parts by weight.

4. The high-temperature resistant graphene heat dissipation coating according to claim 2, characterized in that, The weight parts of each component of the coating are as follows: Organosilicon modified resin: 35~45 parts by weight; Polyester resin: 10-15 parts by weight; Cosolvent: 25-30 parts by weight; Wetting agent: 0.2~1 parts by weight; Dispersant: 1-2 parts by weight; Graphene: 0.2~2 parts by weight; Leveling agent: 0.3~1 parts by weight; Carbon black: 3-5 parts by weight; Modified nano-carbon: 2-5 parts by weight; Silicon dioxide: 3-5 parts by weight.

5. The high-temperature resistant graphene heat dissipation coating according to any one of claims 1-4, characterized in that, The particle size of the modified nano-carbon was selected to be 1–100 nm.

6. The high-temperature resistant graphene heat dissipation coating according to claim 5, characterized in that, The cosolvents used are: sodium benzoate, sodium salicylate, p-aminobenzoic acid, ethanol, or citric acid.

7. The high-temperature resistant graphene heat dissipation coating according to claim 5, characterized in that, The wetting agent used is: polyethylene oxide alkyl phenyl ether or polyethylene oxide fatty acid ester.

8. The high-temperature resistant graphene heat dissipation coating according to claim 5, characterized in that, The dispersant used is sodium tripolyphosphate, sodium hexametaphosphate, sodium pyrophosphate, or fatty acid polyethylene glycol ester; and / or, the leveling agent used is silicone oil, polyether polyester modified organosiloxane, or polydimethylsiloxane; and / or, the silica used is fumed silica or precipitated silica.

9. A method for preparing the high-temperature resistant graphene heat dissipation coating according to any one of claims 1 to 8, wherein the organosilicon modified resin, polyester resin, carbon black, graphene, and modified nano-carbon are mixed according to a predetermined component weight parts.

10. A coating for electronic components, characterized in that, The coating is formed by spraying the high-temperature resistant graphene heat dissipation coating as described in any one of claims 1-9 onto the heat dissipation portion of the high-temperature resistant structure.