Anti-corrosion heat-dissipation powder coating and preparation method thereof

Abstract

The invention discloses an anti-corrosion heat-dissipation powder coating and a preparation method thereof, and belongs to the technical field of powder coatings. Comprising the following raw materials in parts by weight: 60-70 parts of epoxy resin, 8-12 parts of spherical aluminum oxide, 10-16 parts of hexagonal boron nitride, 7-11 parts of aluminum diethylphosphinate, 6-12 parts of a functional aid, 1.5-2 parts of a flatting agent, 0.5-1 part of a degassing agent and 4-6 parts of a curing agent. Wherein the spherical aluminum oxide and the hexagonal boron nitride are used as heat-conducting fillers to construct an efficient heat-conducting network, so that the heat dissipation capability of the coating is remarkably improved; aluminum diethylphosphinate is used as a flame retardant, so that combustion is effectively inhibited; the functional additive contains a plurality of functional groups, so that the corrosion resistance and flame retardance of the coating can be improved; in conclusion, the invention provides the multifunctional integrated powder coating, the defects of the traditional coating in the aspects of heat dissipation, corrosion prevention and flame retardance are effectively overcome, and the application prospect of the powder coating in the high-end industrial field is expanded.

Description

Technical Field

[0001] This invention belongs to the field of powder coating technology, specifically, it relates to an anti-corrosion and heat dissipation powder coating and its preparation method. Background Technology

[0002] In modern industrial production and daily life, metallic materials are widely used due to their excellent mechanical properties and processing characteristics. However, during industrial production and equipment operation, a large number of metal components and electronic components are exposed to harsh environments such as humidity, dust, and acid and alkali corrosion for extended periods. At the same time, the equipment continuously generates heat during operation. If the heat cannot be dissipated in time, the temperature of the components will rise, accelerating the penetration and reaction of corrosive media, significantly shortening the service life of the equipment, and even causing safety hazards.

[0003] Traditional solutions involve electroplating, hot-dip galvanizing, or applying rust-preventive oils or anti-corrosion coatings to form a protective layer on the metal surface, isolating it from contact with moisture, oxygen, corrosive salts, and other media. Organic coatings are widely used due to their ease of application, relatively low cost, and good decorative properties. However, many traditional solvent-based anti-corrosion coatings contain large amounts of volatile organic compounds (VOCs), which can harm the environment and human health during production and application. With increasingly stringent environmental regulations, their application is facing growing restrictions.

[0004] Powder coatings, as an environmentally friendly surface treatment technology, have experienced rapid development globally due to their advantages such as being solvent-free, highly efficient, having excellent coating performance, and allowing for the recycling of excess powder. They are typically composed of resins, curing agents, pigments, fillers, and various additives, produced through melt extrusion, cooling and crushing, grinding, and sieving. Theoretically, applying powder coatings to metal corrosion protection can provide a thick, complete, and strongly adherent physical barrier. However, conventional general-purpose powder coatings such as epoxy and polyester have polymers with extremely low thermal conductivity, making them typical thermal insulators. This severely hinders heat conduction and fails to meet heat dissipation requirements. Furthermore, these polymer matrices are flammable or combustible materials. When these materials are exposed to open flames or high-temperature heat sources, their molecular chains undergo thermal decomposition, producing large amounts of flammable gases, smoke, and molten drips. These flammable gases react violently with oxygen in the air, resulting in combustion, while the molten drips carry the flames, rapidly igniting other flammable materials and causing the fire to spread rapidly in a short period. This inherent flammability severely restricts the application of powder coatings in fields with stringent fire safety requirements. Therefore, it is urgent to solve the above problems in order to meet the higher technical needs of the powder coating technology field. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide an anti-corrosion and heat dissipation powder coating and its preparation method.

[0006] The objective of this invention can be achieved through the following technical solutions: A corrosion-resistant and heat-dissipating powder coating comprises the following raw materials in parts by weight: 60-70 parts epoxy resin, 8-12 parts spherical alumina, 10-16 parts hexagonal boron nitride, 7-11 parts aluminum diethylphosphinate, 6-12 parts functional additives, 1.5-2 parts leveling agent, 0.5-1 part degassing agent, and 4-6 parts curing agent.

[0007] Preferably, the leveling agent is an acrylate leveling agent.

[0008] This invention introduces spherical alumina and hexagonal boron nitride as thermally conductive fillers. The spherical structure of alumina facilitates dispersion in resin, filling the voids between the resin and the filler and reducing overall thermal resistance. Hexagonal boron nitride has extremely high thermal conductivity, and its layered structure can construct efficient planar heat conduction paths. It is also chemically inert and enhances the corrosion resistance of the coating. The introduction of aluminum diethylphosphinate improves the flame retardant properties of the coating. The acrylate leveling agent in the raw materials reduces the surface tension of the coating, preventing defects such as orange peel and pinholes, and improving the appearance quality and density of the coating.

[0009] Preferably, the functional additive is prepared by the following steps: A1. In a three-necked round-bottom flask equipped with a constant-pressure dropping funnel, a magnetic stirrer, and a spherical condenser, elemental sulfur, ethyl cyanoacetate, and N,N-dimethylformamide were added sequentially. Stirring was started, and triethylamine was slowly added dropwise to the flask using the constant-pressure dropping funnel at room temperature. After the addition was complete, the apparatus was heated until the temperature stabilized at 60-70°C. At this temperature, the reaction was continued for 10-12 hours. After the reaction was completed, the auxiliary intermediate product A was obtained after post-processing. A2. In a three-necked round-bottom flask equipped with a magnetic stirrer and a spherical condenser, 3,4,5-trifluorophenol, sodium hydroxide and N,N-dimethylformamide were added in sequence. Stirring was started and carried out at room temperature for 15-30 min. Then 2-chlorocyclohexanone was added and the apparatus was heated until the temperature stabilized at 70-75℃. The reaction was continued at this temperature for 4-5 h. After the reaction was completed, the auxiliary intermediate product B was obtained after post-processing. A3. In a three-necked round-bottom flask equipped with a magnetic stirrer and a spherical condenser, phosphorus oxychloride and auxiliary intermediate product A are first mixed. Stirring is started and carried out at room temperature for 15-30 minutes to dissolve auxiliary intermediate product A. Then, auxiliary intermediate product B is added to the flask in batches. The apparatus is heated until the temperature stabilizes at 105-110℃. At this temperature, the reaction is refluxed for 5-6 hours. After the reaction is completed, the functional auxiliary product is obtained after post-processing.

[0010] Preferably, the ratio of elemental sulfur, ethyl cyanoacetate, N,N-dimethylformamide and triethylamine in step A1 is 3.2g:23.7-25.1g:50mL:30mL.

[0011] Preferably, the ratio of the amounts of 3,4,5-trifluorophenol, sodium hydroxide, N,N-dimethylformamide and 2-chlorocyclohexanone in step A2 is 14.8g:4g:100mL:13.2g.

[0012] Preferably, in step A3, the ratio of phosphorus oxychloride, auxiliary intermediate product A, and auxiliary intermediate product B is 120 mL: 25.8 g: 50.6-53.3 g.

[0013] In the above preparation process, the reaction formulas for steps A1, A2, and A3 are as follows: This invention will further explain the synthesis principle and performance of the functional additives synthesized by the above steps; Synthesis Principle: In step A1 of this invention, the raw materials undergo a Gewald reaction. The molar ratio of elemental sulfur to ethyl cyanoacetate in the reaction raw materials is controlled to be close to 1:2, with the latter in excess, to ensure complete reaction. In step A2 of this invention, sodium hydroxide first reacts with the phenolic hydroxyl group in 3,4,5-trifluorophenol to form sodium phenolate, which has stronger nucleophilicity, and then reacts with 2-chlorocyclohexanone to form an ether bond. Finally, in step A3, the raw materials undergo a Friedländer reaction. Similarly, the molar ratio of auxiliary intermediate A to auxiliary intermediate B in the reaction raw materials is controlled to be close to 1:2, with the latter in excess, to ensure complete reaction.

[0014] Additive Performance: The functional additive synthesized in this application belongs to the thiophene-pyridine class of corrosion inhibitors. Its molecule contains N and S heteroatoms, which all have lone pairs of electrons and can coordinate with unoccupied d orbitals on the metal surface to form strong coordinate bonds, thereby chemically adsorbing onto the metal surface. Furthermore, the thiophene and pyridine rings in the molecule constitute a large conjugated π system, and these π electrons can also interact with the metal surface to further enhance adsorption, thus forming an adsorption film that provides corrosion protection. In addition, the additive also introduces CF bonds. Due to the high bond energy and good stability of CF bonds, they can shield and protect the carbon chain, reduce the surface free energy of the matrix, and thus further improve the corrosion protection performance of the matrix. Finally, the functional additive contains N, S, and Cl, all of which have certain flame retardant properties, thereby enhancing the flame retardancy of the matrix.

[0015] This invention also provides a method for preparing an anti-corrosion and heat-dissipating powder coating, comprising the following steps: B1. Place spherical alumina and hexagonal boron nitride in a vacuum drying oven to dry them and remove surface adsorbed moisture to obtain thermally conductive filler; B2. Add epoxy resin, aluminum diethylphosphinate, corrosion inhibitor, leveling agent, degassing agent and curing agent to a twin-screw mixer in sequence. First, stir at low speed for 5-10 minutes, then add thermally conductive filler, increase the speed and stir at high speed for 10-15 minutes to ensure the initial dispersion of raw materials and obtain a dispersion. B3. The dispersed material is fed into a twin-screw extruder. After being fully melted, sheared and mixed in the barrel, the dispersed material is extruded through the die and cooled to below 40°C to ensure that the material is completely solidified. It is then fed into a coarse crusher for crushing and then into an ultrafine pulverizer for further pulverization to obtain an anti-corrosion and heat-dissipating powder coating.

[0016] Preferably, the drying temperature is 80-100℃ and the time is 3-6 hours.

[0017] Preferably, the low-speed stirring speed is 300-500 r / min.

[0018] Preferably, the high-speed stirring speed is 1000-1500 r / min.

[0019] Preferably, the temperatures of each section of the twin-screw extruder are: 100-110℃ for the feeding section, 115-125℃ for the compression section, 130-140℃ for the melting section, and 125-135℃ for the die head section, with a screw speed of 180-220 r / min.

[0020] Preferably, the pressure of the ultrafine pulverizer is 0.6-0.8 MPa, and the pulverization time is 8-12 min.

[0021] The beneficial effects of this invention are: 1. This invention uses spherical alumina and hexagonal boron nitride as thermally conductive fillers to construct a highly efficient thermally conductive network, which significantly improves the heat dissipation capacity of the coating; 2. Adding aluminum diethylphosphonate as a flame retardant effectively inhibits combustion and has a synergistic effect with functional additives; 3. The use of a solvent-free powder coating system meets environmental protection requirements and reduces VOC emissions; 4. The functional additives of this invention belong to the thiophene-pyridine class of corrosion inhibitor derivatives and contain CF bonds, which can effectively block corrosive media and improve the anti-corrosion performance of coatings. In summary, this invention provides a multifunctional integrated powder coating that effectively solves the shortcomings of traditional coatings in terms of heat dissipation, corrosion prevention, and flame retardancy, and expands the application prospects of powder coatings in high-end industrial fields. Detailed Implementation

[0022] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Example 1 Preparation of functional additives: A1. In a three-necked round-bottom flask equipped with a constant-pressure dropping funnel, a magnetic stirrer, and a spherical condenser, 3.2 g of elemental sulfur, 23.7 g of ethyl cyanoacetate, and 50 mL of N,N-dimethylformamide were added sequentially. Stirring was started, and at room temperature, 30 mL of triethylamine was slowly added dropwise to the flask using the constant-pressure dropping funnel. After the addition was complete, the apparatus was heated until the temperature stabilized at 60 °C. The reaction was continued at this temperature for 10 h. After the reaction was completed, the reaction mixture was poured into a large amount of water and stirred for 30 min with a magnetic stirrer. The precipitate was filtered and then recrystallized using ethyl acetate / petroleum ether to obtain auxiliary intermediate product A. A2. In a three-necked round-bottom flask equipped with a magnetic stirrer and a spherical condenser, 14.8 g of 3,4,5-trifluorophenol, 4 g of sodium hydroxide, and 100 mL of N,N-dimethylformamide were added sequentially. The stirring was started and carried out at room temperature for 15 min. Then, 13.2 g of 2-chlorocyclohexanone was added, and the apparatus was heated until the temperature stabilized at 70 °C. The reaction was continued at this temperature for 4 h. After the reaction was completed, the reaction solution was cooled to room temperature and slowly poured into ice water, and stirred for 10 min. The solution was then transferred to a separatory funnel and extracted twice with dichloromethane. The organic phases were combined. The organic phase was washed once with deionized water and dried with anhydrous sodium sulfate for 30 min. The desiccant was removed by filtration, and the solution was distilled under reduced pressure to obtain auxiliary intermediate B. A3. In a three-necked round-bottom flask equipped with a magnetic stirrer and a spherical condenser, 120 mL of phosphorus oxychloride and 25.8 g of auxiliary intermediate product A were first mixed. Stirring was started and the mixture was stirred at room temperature for 15 min to dissolve auxiliary intermediate product A. Then, 50.6 g of auxiliary intermediate product B was added to the flask in batches. The apparatus was heated until the temperature stabilized at 105℃. The reaction was refluxed at this temperature for 5 h. After the reaction was completed, the residue was dissolved in dichloromethane and placed in an ice-water bath. Excess phosphorus oxychloride was treated by adding saturated sodium carbonate solution dropwise. After extraction with saturated sodium carbonate and dichloromethane, anhydrous sodium sulfate was added for drying. The desiccant was removed by filtration, and the mixture was separated by column chromatography (ethyl acetate / petroleum ether = 1 / 10) under reduced pressure to obtain the functional auxiliary product. A method for preparing an anti-corrosion and heat-dissipating powder coating includes the following steps: B1. Place 8 parts of spherical alumina and 10 parts of hexagonal boron nitride in a vacuum drying oven and dry at 80°C for 3 hours to remove surface adsorbed moisture and obtain thermally conductive filler. B2. Add 60 parts epoxy resin (E-12), 7 parts aluminum diethylphosphinate, 6 parts corrosion inhibitor, 1.5 parts leveling agent (BYK-356), 0.5 parts degassing agent (benzoin) and 4 parts dicyandiamide sequentially into a twin-screw mixer. First, stir at a low speed of 300 r / min for 5 min, then add thermally conductive filler, increase the speed, and stir at a high speed of 1000 r / min for 10 min to ensure the initial dispersion of the raw materials and obtain a dispersion. B3. The dispersed material is fed into a twin-screw extruder (feeding section 100℃, compression section 115℃, melting section 130℃, die head section 125℃, screw speed 180r / min). After the dispersed material is fully melted and sheared in the barrel, it is extruded through the die head and cooled to below 40℃ to ensure that the material is completely solidified. It is then fed into a coarse crusher for crushing and then into an ultrafine pulverizer (pressure 0.6MPa) for pulverizing for 8 minutes to obtain an anti-corrosion and heat dissipation powder coating.

[0024] Example 2 Preparation of functional additives: A1. In a three-necked round-bottom flask equipped with a constant-pressure dropping funnel, a magnetic stirrer, and a spherical condenser, 3.2 g of elemental sulfur, 25.1 g of ethyl cyanoacetate, and 50 mL of N,N-dimethylformamide were added sequentially. Stirring was started, and at room temperature, 30 mL of triethylamine was slowly added dropwise to the flask using the constant-pressure dropping funnel. After the addition was complete, the apparatus was heated until the temperature stabilized at 70 °C. The reaction was continued at this temperature for 12 h. After the reaction was completed, the reaction mixture was poured into a large amount of water and stirred for 30 min with a magnetic stirrer. The precipitate was filtered and then recrystallized using ethyl acetate / petroleum ether to obtain auxiliary intermediate product A. A2. In a three-necked round-bottom flask equipped with a magnetic stirrer and a spherical condenser, 14.8 g of 3,4,5-trifluorophenol, 4 g of sodium hydroxide, and 100 mL of N,N-dimethylformamide were added sequentially. The stirring was started and carried out at room temperature for 30 min. Then, 13.2 g of 2-chlorocyclohexanone was added, and the apparatus was heated until the temperature stabilized at 75 °C. The reaction was continued at this temperature for 5 h. After the reaction was completed, the reaction solution was cooled to room temperature and slowly poured into ice water, and stirred for 10 min. The solution was transferred to a separatory funnel and extracted twice with dichloromethane. The organic phases were combined. The organic phase was washed once with deionized water and dried with anhydrous sodium sulfate for 30 min. The desiccant was removed by filtration, and the solution was distilled under reduced pressure to obtain auxiliary intermediate B. A3. In a three-necked round-bottom flask equipped with a magnetic stirrer and a spherical condenser, 120 mL of phosphorus oxychloride and 25.8 g of auxiliary intermediate product A were first mixed. Stirring was started and carried out at room temperature for 30 min to dissolve auxiliary intermediate product A. Then, 53.3 g of auxiliary intermediate product B was added to the flask in batches. The apparatus was heated until the temperature stabilized at 110℃. The reaction was refluxed at this temperature for 6 h. After the reaction was completed, the residue was dissolved in dichloromethane and placed in an ice-water bath. Excess phosphorus oxychloride was treated by adding saturated sodium carbonate solution dropwise. After extraction with saturated sodium carbonate and dichloromethane, anhydrous sodium sulfate was added for drying. The desiccant was removed by filtration, and the product was separated by column chromatography (ethyl acetate / petroleum ether = 1 / 10) under reduced pressure to obtain the functional auxiliary product. A method for preparing an anti-corrosion and heat-dissipating powder coating includes the following steps: B1. Place 10 parts of spherical alumina and 13 parts of hexagonal boron nitride in a vacuum drying oven and dry at 100°C for 6 hours to remove surface adsorbed moisture and obtain thermally conductive filler. B2. Add 65 parts epoxy resin (E-12), 9 parts aluminum diethylphosphinate, 9 parts corrosion inhibitor, 1.75 parts leveling agent (BYK-356), 0.75 parts degassing agent (benzoin) and 5 parts dicyandiamide sequentially into a twin-screw mixer. First, stir at a low speed of 500 r / min for 10 min, then add thermally conductive filler, increase the speed, and stir at a high speed of 1500 r / min for 15 min to ensure the initial dispersion of the raw materials and obtain a dispersion. B3. The dispersed material is fed into a twin-screw extruder (feeding section 105℃, compression section 120℃, melting section 135℃, die head section 130℃, screw speed 200r / min). After the dispersed material is fully melted and sheared in the barrel, it is extruded through the die head and cooled to below 40℃ to ensure that the material is completely solidified. It is then fed into a coarse crusher for crushing and then into an ultrafine pulverizer (pressure 0.7MPa) for pulverizing for 10 minutes to obtain an anti-corrosion and heat dissipation powder coating.

[0025] Example 3 The only difference between this embodiment and Embodiment 2 is that, in this embodiment, a method for preparing an anti-corrosion and heat-dissipating powder coating includes the following steps: B1. Place 12 parts of spherical alumina and 16 parts of hexagonal boron nitride in a vacuum drying oven and dry at 100°C for 6 hours to remove surface adsorbed moisture and obtain thermally conductive filler. B2. Add 70 parts epoxy resin (E-12), 11 parts aluminum diethylphosphinate, 12 parts corrosion inhibitor, 2 parts leveling agent (BYK-356), 1 part degassing agent (benzoin) and 6 parts dicyandiamide sequentially into a twin-screw mixer. First, stir at a low speed of 500 r / min for 10 min, then add thermally conductive filler, increase the speed, and stir at a high speed of 1500 r / min for 15 min to ensure the initial dispersion of the raw materials and obtain a dispersion. B3. The dispersed material is fed into a twin-screw extruder (feeding section 110℃, compression section 125℃, melting section 140℃, die head section 135℃, screw speed 220r / min). After the dispersed material is fully melted and sheared in the barrel, it is extruded through the die head and cooled to below 40℃ to ensure that the material is completely solidified. It is then fed into a coarse crusher for crushing and then into an ultrafine pulverizer (pressure 0.8MPa) for pulverizing for 12 minutes to obtain an anti-corrosion and heat dissipation powder coating.

[0026] Comparative Example 1 The only difference between this comparative example and Example 3 is that in this comparative example, an equal amount of thiobenzothiazole (corrosion inhibitor) was used to replace the anti-corrosion additive to prepare the coating.

[0027] Comparative Example 2 Use commercially available epoxy resin powder coating; manufacturer: Tektronix, model: INFRALIEP8025-00.

[0028] The following performance tests were conducted on Examples 1, 2, and 3, and Comparative Examples 1 and 2: The thermal conductivity was determined according to the national standard GB / T 10297-2015 to evaluate the heat dissipation capacity of the coating. Using the national standard GB / T 1771-2007, a 5% NaCl solution was continuously sprayed at 35°C, and the time to the first corrosion of the coating was recorded; this was used to evaluate the corrosion resistance of the coating in a salt spray environment. The flame retardancy rating is determined according to the UL 94 test standard to evaluate the flame retardant performance of the coating. The performance test results are shown in Table 1: Table 1 Test Project Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Thermal conductivity (W / m·K) 0.92 0.93 0.93 0.93 0.37 Time to first corrosion (h) 750 790 810 590 330 Flame retardant rating V-0 V-0 V-0 V-1 V-2 As can be seen from the test results in Table 1, the powder coating prepared in the embodiments of the present invention has better heat dissipation performance than commercially available epoxy resin powder coatings. Furthermore, due to the addition of anti-corrosion additives, the anti-corrosion and flame retardant properties of the embodiments are also better than those of the comparative examples. Therefore, the powder coating prepared in the present invention has excellent performance, which expands the application prospects of powder coatings in high-end industrial fields.

[0029] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

Claims

1. A corrosion-resistant and heat-dissipating powder coating, characterized in that, The raw materials include the following parts by weight: 60-70 parts epoxy resin, 8-12 parts spherical alumina, 10-16 parts hexagonal boron nitride, 7-11 parts aluminum diethylphosphonate, 6-12 parts functional additives, 1.5-2 parts leveling agent, 0.5-1 part degassing agent, and 4-6 parts curing agent.

2. The anti-corrosion and heat dissipation powder coating according to claim 1, characterized in that, The functional additive is prepared through the following steps: A1. In a flask, add elemental sulfur, ethyl cyanoacetate and N,N-dimethylformamide in sequence, start stirring, and add triethylamine dropwise to the flask at room temperature. After the addition is complete, heat to 60-70℃ and react for 10-12 hours. When the reaction is complete, the auxiliary intermediate product A is obtained. A2. In a flask, add 3,4,5-trifluorophenol, sodium hydroxide and N,N-dimethylformamide in sequence, start stirring and stir at room temperature for 15-30 min, then add 2-chlorocyclohexanone, heat to 70-75℃, react for 4-5 h, and the reaction is completed to obtain auxiliary intermediate product B. A3. In a flask, first mix phosphorus oxychloride with auxiliary intermediate product A, start stirring, and stir at room temperature for 15-30 minutes. Then add auxiliary intermediate product B to the flask, heat to 105-110℃, and reflux for 5-6 hours. After the reaction is complete, the functional auxiliary product is obtained.

3. The anti-corrosion and heat dissipation powder coating according to claim 2, characterized in that, In step A1, the ratio of elemental sulfur, ethyl cyanoacetate, N,N-dimethylformamide, and triethylamine is 3.2 g: 23.7-25.1 g: 50 mL: 30 mL.

4. The anti-corrosion and heat dissipation powder coating according to claim 2, characterized in that, In step A2, the ratio of the amounts of 3,4,5-trifluorophenol, sodium hydroxide, N,N-dimethylformamide, and 2-chlorocyclohexanone is 14.8 g: 4 g: 100 mL: 13.2 g.

5. The anti-corrosion and heat dissipation powder coating according to claim 2, characterized in that, In step A3, the ratio of phosphorus oxychloride, auxiliary intermediate product A, and auxiliary intermediate product B is 120mL:25.8g:50.6-53.3g.

6. The anti-corrosion and heat dissipation powder coating according to claim 1, characterized in that, The leveling agent is an acrylate leveling agent.

7. A method for preparing an anti-corrosion and heat-dissipating powder coating, used to prepare the anti-corrosion and heat-dissipating powder coating according to any one of claims 1-6, characterized in that, Includes the following steps: B1. Dry spherical alumina and hexagonal boron nitride to obtain a thermally conductive filler; B2. Add epoxy resin, aluminum diethylphosphinate, corrosion inhibitor, leveling agent, degassing agent and curing agent to a twin-screw mixer in sequence. First, stir at low speed for 5-10 minutes, then add thermally conductive filler and stir at high speed for 10-15 minutes to obtain a dispersion. B3. The dispersed material is fed into a twin-screw extruder, where it is fully melted, extruded, cooled, and solidified in the barrel. It is then fed into a coarse crusher for crushing and then into an ultrafine pulverizer for further pulverization to obtain an anti-corrosion and heat-dissipating powder coating.

8. The method for preparing an anti-corrosion and heat-dissipating powder coating according to claim 7, characterized in that, The speed of the low-speed stirring is 300-500 r / min.

9. The method for preparing an anti-corrosion and heat-dissipating powder coating according to claim 7, characterized in that, The high-speed stirring speed is 1000-1500 r / min.

10. The method for preparing an anti-corrosion and heat-dissipating powder coating according to claim 7, characterized in that, The pressure of the ultrafine pulverizer is 0.6-0.8 MPa, and the pulverization time is 8-12 min.

Images