Preparation process of corrosion-resistant heat-dissipation fluorocarbon resin coating

Abstract

The invention discloses a preparation process of a corrosion-resistant heat-dissipation fluorocarbon resin coating. Comprising the following steps: step 1, preparing a polyurethane emulsion; and 2, adding a polyurethane emulsion into deionized water, carrying out ultrasonic treatment, sequentially adding sodium bicarbonate, potassium persulfate, vinyl acetate and the modified carbon nanotubes, carrying out uniform stirring, removing oxygen, adding chlorotrifluoroethylene, raising the temperature to 80-90 DEG C, carrying out a reaction for 7-8 h, and after the reaction is finished, carrying out cooling to room temperature so as to obtain the fluorocarbon resin coating. The preparation method has the beneficial effects that the waterborne polyurethane is used as an emulsifier, and the terpolymer modified carbon nanotubes are introduced, so that the comprehensive performance of the fluorocarbon resin coating is effectively improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of coatings, and in particular relates to a preparation process of a corrosion-resistant and heat-dissipating fluorocarbon resin coating. Background Art

[0002] In the field of coating technology, fluorocarbon resin coatings are widely used due to their excellent weather resistance and chemical stability. However, existing fluorocarbon resin coatings still have some defects in practical applications. On the one hand, its corrosion resistance needs to be further improved. When facing a complex corrosive environment, the coating is easily corroded by the corrosive medium, causing damage to the metal substrate and affecting its service life. On the other hand, insufficient heat dissipation performance is another major problem. When the coating is applied to equipment or scenes that require heat dissipation, the heat cannot be dissipated in time, which may affect the normal operation and performance of the equipment. In addition, the compatibility and bonding strength of the various components in the existing coatings are also insufficient, which makes the mechanical properties of the coating, such as tensile strength, less than ideal, and it is prone to cracking and falling off when subjected to external forces.

[0003] Therefore, it is of great practical significance to develop a preparation process for fluorocarbon resin coatings with better corrosion resistance, good heat dissipation capacity and excellent mechanical properties. Summary of the Invention

[0004] The purpose of the present invention is to overcome the defects of the prior art and provide a preparation process of a corrosion-resistant and heat-dissipating fluorocarbon resin coating.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A preparation process of a corrosion-resistant heat-dissipating fluorocarbon resin coating comprises the following steps:

[0007] Step 1: Mix polytetrahydrofuran, isophorone diisocyanate, 2,2-dimethylolpropionic acid, and N,N-dimethylformamide, raise the temperature to 60-70°C, react for 1-2 hours, then add 1,4-butanediol and dibutyltin dilaurate, continue to raise the temperature to 80-90°C, react for another 4-5 hours, cool to 30-40°C, add triethylamine, stir evenly, and shear disperse in deionized water for 1-2 hours to obtain a polyurethane emulsion;

[0008] Step 2: Add the polyurethane emulsion to deionized water and ultrasonically treat for 30-40 minutes. Then, add sodium bicarbonate, potassium persulfate, vinyl acetate, and modified carbon nanotubes in sequence, stir evenly, remove oxygen, add chlorotrifluoroethylene, increase the temperature to 80-90°C, react for 7-8 hours, and after the reaction is completed, cool to room temperature to obtain a fluorocarbon resin coating.

[0009] More optimally, the polyurethane emulsion raw materials include the following components: by weight, 50-60 parts of polytetrahydrofuran, 30-40 parts of isophorone diisocyanate, 7-8 parts of 2,2-dihydroxymethylpropionic acid, 30-40 parts of N,N-dimethylformamide, 1-2 parts of 1,4-butanediol, 0.2-0.4 parts of dibutyltin dilaurate, and 6-8 parts of triethylamine.

[0010] More optimally, the fluorocarbon resin raw material includes the following components: by weight, 1-2 parts of 1-2 parts of polyurethane emulsion, 80-100 parts of deionized water, 0.2-0.3 parts of sodium bicarbonate, 0.1-0.2 parts of potassium persulfate, 8-10 parts of vinyl acetate, 0.3-0.4 parts of modified carbon nanotubes, and 25-30 parts of chlorotrifluoroethylene.

[0011] More optimally, the preparation process of the modified carbon nanotubes is:

[0012] S1: Add 2-amino-4-hydroxy-6-methylpyrimidine to anhydrous dimethyl sulfoxide, stir at 170-180°C for 10-15 minutes, then cool the reaction solution to 0°C, slowly add ethyl isocyanate methacrylate, react for 1-2 hours, centrifuge, and wash to obtain a modified monomer;

[0013] S2: Mix the modified monomer, vinyl acetate, maleic anhydride, and N,N-dimethylformamide, raise the temperature to 60-70°C, slowly add the azobisisobutyronitrile solution dropwise, and after the addition is complete, reflux for 10-12 hours. After the reaction is complete, post-treat to obtain a terpolymer;

[0014] S3: Add oxidized carbon nanotubes to ethyl acetate, add 3-aminopropyltriethoxysilane and deionized water, increase the temperature to 70-80°C, reflux for 10-12 hours, filter, wash, and obtain amino carbon nanotubes; then mix the terpolymer, N,N-dimethylformamide, and amino carbon nanotubes, stir at room temperature for 4-5 hours, filter, wash, and dry to obtain modified carbon nanotubes.

[0015] In the scheme, the amino group of 2-amino-4-hydroxy-6-methylpyrimidine undergoes a nucleophilic addition reaction with the isocyanate group of ethyl isocyanate methacrylate. The specific reaction process is as follows:

[0016]

[0017] More optimally, the modified monomer raw material includes the following components: 4-5 parts by weight of 2-amino-4-hydroxy-6-methylpyrimidine, 50-60 parts by weight of anhydrous dimethyl sulfoxide, and 5-6 parts by weight of ethyl isocyanate methacrylate.

[0018] In this scheme, the copolymerization of the three monomers is achieved through free radical polymerization. Azobisisobutyronitrile is thermally decomposed to generate free radicals that initiate chain growth, forming a branched copolymer structure with pyrimidine ring side groups. The specific reaction process is shown below:

[0019]

[0020] More optimally, the terpolymer raw material includes the following components: by weight, 10-12 parts of modified monomer, 15-18 parts of vinyl acetate, 5-6 parts of maleic anhydride, 70-80 parts of N,N-dimethylformamide, and 2-3 parts of azobisisobutyronitrile solution; wherein the concentration of the azobisisobutyronitrile solution is 10wt%.

[0021] In this scheme, 3-aminopropyltriethoxysilane is hydrolyzed and condensed to form siloxane bonds on the surface of oxidized carbon nanotubes, and the terpolymer further reacts with it to obtain modified carbon nanotubes. The specific reaction process is as follows:

[0022]

[0023] More optimally, the amination carbon nanotube raw material comprises the following components: by weight, 10-12 parts of oxidized carbon nanotubes, 100-120 parts of ethyl acetate, 0.5-1 part of 3-aminopropyltriethoxysilane, and 0.3-1 part of deionized water.

[0024] More optimally, the modified carbon nanotube raw material comprises the following components: by weight, 10-20 parts of terpolymer, 70-80 parts of N,N-dimethylformamide, and 5-6 parts of amino-treated carbon nanotubes.

[0025] Beneficial effects of the present invention:

[0026] The present invention uses waterborne polyurethane as an emulsifier and introduces carbon nanotubes modified with terpolymers to effectively improve the comprehensive performance of the fluorocarbon resin coating. The details are as follows:

[0027] One approach involves synthesizing an amphiphilic polyurethane emulsion that acts as an emulsifier for the fluorocarbon coating. This effectively encapsulates monomers like chlorotrifluoroethylene, allowing them to undergo copolymerization within the coating, forming a core-shell structure. Furthermore, the polyurethane segments can crosslink with the modified carbon nanotubes through hydrogen bonds, enhancing the coating's mechanical properties.

[0028] Second, in this approach, a terpolymer is grafted onto the surface of carbon nanotubes. The lone pair electrons of the nitrogen atoms in the modified monomers contained in the terpolymer can form coordination bonds with the empty orbitals on the surface of the metal substrate, building a chemical anchoring layer at the coating-metal interface. This enhances adhesion while inhibiting electron migration, thus blocking the corrosion path electrochemically. Furthermore, this coordination effect can be combined with the physical barrier of the polyurethane shell to form a dual anti-corrosion mechanism of "chemical barrier-physical shielding," further enhancing the coating's salt spray resistance. Furthermore, because the terpolymer contains the same monomers as the fluorocarbon resin, during the copolymerization process, the polymer chain segments on the surface of the carbon nanotubes can gradually entangle with the resin molecular chains, prompting the carbon nanotubes to form an interconnected three-dimensional grid structure during curing, thereby improving the material's thermal conductivity. DETAILED DESCRIPTION

[0029] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0030] Example 1: A process for preparing a corrosion-resistant heat-dissipating fluorocarbon resin coating, comprising the following steps:

[0031] Step 1: 50 parts of polytetrahydrofuran, 30 parts of isophorone diisocyanate, 7 parts of 2,2-dimethylolpropionic acid, and 30 parts of N,N-dimethylformamide were mixed, the temperature was raised to 60°C, and the mixture was reacted for 1 hour. Subsequently, 1 part of 1,4-butanediol and 0.2 parts of dibutyltin dilaurate were added, the temperature was further raised to 80°C, the mixture was reacted for another 4 hours, the temperature was lowered to 30°C, 6 parts of triethylamine were added, the mixture was stirred evenly, and shear dispersed in deionized water for 1 hour to obtain a polyurethane emulsion;

[0032] Step 2: Add 1 part of polyurethane emulsion to 80 parts of deionized water, ultrasonically treat for 30 minutes, then add 0.2 parts of sodium bicarbonate, 0.1 parts of potassium persulfate, 8 parts of vinyl acetate, and 0.3 parts of modified carbon nanotubes in sequence, stir evenly, remove oxygen, add 25 parts of chlorotrifluoroethylene, increase the temperature to 80°C, react for 7 hours, and after the reaction is completed, cool to room temperature to obtain a fluorocarbon resin coating;

[0033] The preparation process of modified carbon nanotubes is as follows:

[0034] S1: 4 parts of 2-amino-4-hydroxy-6-methylpyrimidine were added to 50 parts of anhydrous dimethyl sulfoxide, and stirred at 170°C for 10 minutes. The reaction solution was then cooled to 0°C, and 5 parts of ethyl isocyanate methacrylate were slowly added. The mixture was reacted for 1 hour, centrifuged, and washed to obtain a modified monomer.

[0035] S2: 10 parts of modified monomer, 15 parts of vinyl acetate, 5 parts of maleic anhydride, and 70 parts of N,N-dimethylformamide were mixed, the temperature was raised to 60°C, and 2 parts of azobisisobutyronitrile solution (the concentration of the azobisisobutyronitrile solution was 10 wt %, and the solvent was N,N-dimethylformamide) were slowly added dropwise. After the addition was complete, the mixture was refluxed for 10 hours. After the reaction was complete, the mixture was post-treated to obtain a terpolymer;

[0036] S3: Add 10 parts of oxidized carbon nanotubes to 100 parts of ethyl acetate, add 0.5 parts of 3-aminopropyltriethoxysilane and 0.3 parts of deionized water, increase the temperature to 70°C, reflux for 10 hours, filter, and wash to obtain amino carbon nanotubes; then mix 10 parts of the terpolymer, 70 parts of N,N-dimethylformamide, and 5 parts of the amino carbon nanotubes, stir at room temperature for 4 hours, filter, wash, and dry to obtain modified carbon nanotubes.

[0037] Example 2: A process for preparing a corrosion-resistant, heat-dissipating fluorocarbon resin coating, comprising the following steps:

[0038] Step 1: 60 parts of polytetrahydrofuran, 40 parts of isophorone diisocyanate, 8 parts of 2,2-dimethylolpropionic acid, and 40 parts of N,N-dimethylformamide were mixed, the temperature was raised to 70°C, and the reaction was carried out for 2 hours. Subsequently, 2 parts of 1,4-butanediol and 0.4 parts of dibutyltin dilaurate were added, the temperature was further raised to 90°C, and the reaction was continued for 5 hours. The temperature was then lowered to 40°C, and 8 parts of triethylamine were added. The mixture was stirred evenly and shear-dispersed in deionized water for 2 hours to obtain a polyurethane emulsion.

[0039] Step 2: Add 2 parts of polyurethane emulsion to 100 parts of deionized water, ultrasonically treat for 40 minutes, then add 0.3 parts of sodium bicarbonate, 0.2 parts of potassium persulfate, 10 parts of vinyl acetate, and 0.4 parts of modified carbon nanotubes in sequence, stir evenly, remove oxygen, add 30 parts of chlorotrifluoroethylene, increase the temperature to 90°C, react for 8 hours, and after the reaction is completed, cool to room temperature to obtain a fluorocarbon resin coating;

[0040] The preparation process of modified carbon nanotubes is as follows:

[0041] S1: Add 5 parts of 2-amino-4-hydroxy-6-methylpyrimidine to 60 parts of anhydrous dimethyl sulfoxide, stir at 180°C for 15 minutes, then cool the reaction solution to 0°C, slowly add 6 parts of ethyl isocyanate methacrylate, react for 2 hours, centrifuge, and wash to obtain a modified monomer;

[0042] S2: 12 parts of modified monomer, 18 parts of vinyl acetate, 6 parts of maleic anhydride, and 80 parts of N,N-dimethylformamide were mixed, the temperature was raised to 70°C, and 3 parts of azobisisobutyronitrile solution (the concentration of the azobisisobutyronitrile solution was 10 wt % and the solvent was N,N-dimethylformamide) were slowly added dropwise. After the addition was complete, the mixture was refluxed for 12 hours. After the reaction was complete, the mixture was post-treated to obtain a terpolymer.

[0043] S3: Add 12 parts of oxidized carbon nanotubes to 120 parts of ethyl acetate, add 1 part of 3-aminopropyltriethoxysilane and 1 part of deionized water, increase the temperature to 80°C, reflux for 12 hours, filter, and wash to obtain amino carbon nanotubes; then mix 20 parts of the terpolymer, 80 parts of N,N-dimethylformamide, and 6 parts of the amino carbon nanotubes, stir at room temperature for 5 hours, filter, wash, and dry to obtain modified carbon nanotubes.

[0044] Example 3: A process for preparing a corrosion-resistant heat-dissipating fluorocarbon resin coating, comprising the following steps:

[0045] Step 1: 55 parts of polytetrahydrofuran, 35 parts of isophorone diisocyanate, 7.5 parts of 2,2-dimethylolpropionic acid, and 35 parts of N,N-dimethylformamide were mixed, the temperature was raised to 65°C, and the reaction was carried out for 1.5 hours. Subsequently, 1.5 parts of 1,4-butanediol and 0.3 parts of dibutyltin dilaurate were added, the temperature was further raised to 85°C, and the reaction was continued for 4.5 hours. The temperature was then lowered to 35°C, and 7 parts of triethylamine were added. The mixture was stirred evenly and shear dispersed in deionized water for 1.5 hours to obtain a polyurethane emulsion;

[0046] Step 2: 1.5 parts of polyurethane emulsion were added to 90 parts of deionized water, and ultrasonic treatment was performed for 35 minutes. Then, 0.25 parts of sodium bicarbonate, 0.15 parts of potassium persulfate, 9 parts of vinyl acetate, and 0.35 parts of modified carbon nanotubes were added in sequence, and stirred evenly. After removing oxygen, 27.5 parts of chlorotrifluoroethylene were added, and the temperature was raised to 85°C. The reaction was carried out for 7.5 hours. After the reaction was completed, the mixture was cooled to room temperature to obtain a fluorocarbon resin coating;

[0047] The preparation process of modified carbon nanotubes is as follows:

[0048] S1: Add 4.5 parts of 2-amino-4-hydroxy-6-methylpyrimidine to 55 parts of anhydrous dimethyl sulfoxide, stir at 175°C for 12.5 minutes, then cool the reaction solution to 0°C, slowly add 5.5 parts of ethyl isocyanate methacrylate, react for 1.5 hours, centrifuge, and wash to obtain a modified monomer;

[0049] S2: 11 parts of modified monomer, 16.5 parts of vinyl acetate, 5.5 parts of maleic anhydride, and 75 parts of N,N-dimethylformamide were mixed, the temperature was raised to 65°C, and 2.5 parts of azobisisobutyronitrile solution (the concentration of the azobisisobutyronitrile solution was 10 wt % and the solvent was N,N-dimethylformamide) was slowly added dropwise. After the addition was complete, the mixture was refluxed for 11 hours. After the reaction was complete, post-processing was performed to obtain a terpolymer;

[0050] S3: Add 11 parts of oxidized carbon nanotubes to 110 parts of ethyl acetate, add 0.75 parts of 3-aminopropyltriethoxysilane and 0.65 parts of deionized water, raise the temperature to 75°C, reflux for 11 hours, filter, and wash to obtain amino carbon nanotubes; then mix 15 parts of the terpolymer, 75 parts of N,N-dimethylformamide, and 5.5 parts of the amino carbon nanotubes, stir at room temperature for 4.5 hours, filter, wash, and dry to obtain modified carbon nanotubes.

[0051] Comparative Example 1: No modified carbon nanotubes were added, and the rest was the same as in Example 3, as follows:

[0052] Step 1: 55 parts of polytetrahydrofuran, 35 parts of isophorone diisocyanate, 7.5 parts of 2,2-dimethylolpropionic acid, and 35 parts of N,N-dimethylformamide were mixed, the temperature was raised to 65°C, and the reaction was carried out for 1.5 hours. Subsequently, 1.5 parts of 1,4-butanediol and 0.3 parts of dibutyltin dilaurate were added, the temperature was further raised to 85°C, and the reaction was continued for 4.5 hours. The temperature was then lowered to 35°C, and 7 parts of triethylamine were added. The mixture was stirred evenly and shear dispersed in deionized water for 1.5 hours to obtain a polyurethane emulsion;

[0053] Step 2: Add 1.5 parts of polyurethane emulsion to 90 parts of deionized water, ultrasonically treat for 35 minutes, then add 0.25 parts of sodium bicarbonate, 0.15 parts of potassium persulfate, and 9 parts of vinyl acetate in sequence, stir evenly, remove oxygen, add 27.5 parts of chlorotrifluoroethylene, increase the temperature to 85°C, react for 7.5 hours, and after the reaction is completed, cool to room temperature to obtain a fluorocarbon resin coating.

[0054] Comparative Example 2: Polyurethane emulsion is not used, and the rest is the same as Example 3, specifically as follows:

[0055] 0.1 parts of sodium lauryl sulfate were mixed with 80 parts of deionized water and ultrasonically dispersed. Then, 0.25 parts of sodium bicarbonate, 0.15 parts of potassium persulfate, 9 parts of vinyl acetate, and 0.35 parts of modified carbon nanotubes were added in sequence and stirred evenly. After removing oxygen, 27.5 parts of chlorotrifluoroethylene were added, the temperature was raised to 85°C, and the reaction was carried out for 7.5 hours. After the reaction was completed, the mixture was cooled to room temperature to obtain a fluorocarbon resin coating.

[0056] Detection test:

[0057] The fluorocarbon resin coatings obtained in the examples and comparative examples were drop-coated on a substrate (tinplate) and dried at 50° C. for 48 h to form a thin film. The following tests were then performed:

[0058] (1) The tensile strength of each coating in the examples and comparative examples was measured according to GB / T 13477.8-2002;

[0059] (2) Evaluate the adhesion between each coating and substrate in the Examples and Comparative Examples according to GB / T 9286-1998;

[0060] (3) The samples obtained in the examples and comparative examples were artificially scratched and then placed in a salt spray chamber. The spray was continued for 30 days and the appearance was observed.

[0061] (4) The thermal conductivity of each sample of the embodiment and comparative example was measured using the laser flash method (ASTM E1461);

[0062] The obtained data is shown in the following table:

[0063]

[0064] Table 1

[0065] Conclusion: The present invention significantly improves the comprehensive performance of fluorocarbon resin coatings by introducing water-based polyurethane emulsion as an emulsifier and using terpolymer to modify carbon nanotubes. From the data of the examples and comparative examples, it can be seen that the coatings of Examples 1, 2, and 3 containing modified carbon nanotubes and using polyurethane emulsion have a tensile strength of 7.89-7.99 MPa, an adhesion of level 1, a thermal conductivity of 4.2-4.5 W / (mk), and no obvious corrosion after 30 days of salt spray testing; while the tensile strength of Comparative Example 1 (without modified carbon nanotubes) dropped to 5.98 MPa, the thermal conductivity was only 2.1 (W / (mk)), and slight corrosion occurred in the salt spray test; the tensile strength of Comparative Example 2 (without polyurethane emulsion) was as low as 4.68 MPa, the adhesion dropped to level 2, and the heat dissipation and anti-corrosion performance were also weaker than those of the examples. The results show that the core-shell structure of the polyurethane emulsion works synergistically with the "chemical barrier-physical shielding" dual anti-corrosion mechanism and thermal conductive grid structure of the modified carbon nanotubes, effectively enhancing the mechanical strength, adhesion, salt spray resistance and thermal conductivity of the coating, verifying the scientificity and practicality of the preparation process of the present invention.

[0066] Throughout the specification, references to terms such as "one embodiment," "example," or "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0067] The above contents are merely examples and explanations of the present invention. Those skilled in the art may make various modifications or additions to the described specific embodiments or replace them in similar ways. As long as they do not deviate from the invention or exceed the scope defined by the claims, they should all fall within the scope of protection of the present invention.

Claims

1. A process for preparing a corrosion-resistant, heat-dissipating fluorocarbon resin coating, characterized by: The following steps are involved: Step 1: Mix polytetrahydrofuran, isophorone diisocyanate, 2,2-dimethylolpropionic acid, and N,N-dimethylformamide, raise the temperature to 60-70°C, react for 1-2 hours, then add 1,4-butanediol and dibutyltin dilaurate, continue to raise the temperature to 80-90°C, react for another 4-5 hours, cool to 30-40°C, add triethylamine, stir evenly, and shear disperse in deionized water for 1-2 hours to obtain a polyurethane emulsion; Step 2: Add the polyurethane emulsion to deionized water and ultrasonically treat for 30-40 minutes. Then, add sodium bicarbonate, potassium persulfate, vinyl acetate, and modified carbon nanotubes in sequence, stir evenly, remove oxygen, add chlorotrifluoroethylene, increase the temperature to 80-90°C, react for 7-8 hours, and after the reaction is completed, cool to room temperature to obtain a fluorocarbon resin coating.

2. The process for preparing a corrosion-resistant, heat-dissipating fluorocarbon resin coating according to claim 1, characterized in that: The polyurethane emulsion raw materials include the following components: by weight, 50-60 parts of polytetrahydrofuran, 30-40 parts of isophorone diisocyanate, 7-8 parts of 2,2-dihydroxymethylpropionic acid, 30-40 parts of N,N-dimethylformamide, 1-2 parts of 1,4-butanediol, 0.2-0.4 parts of dibutyltin dilaurate, and 6-8 parts of triethylamine.

3. The process for preparing a corrosion-resistant, heat-dissipating fluorocarbon resin coating according to claim 1, characterized in that: The fluorocarbon resin raw material comprises the following components: by weight, 1-2 parts of polyurethane emulsion, 80-100 parts of deionized water, 0.2-0.3 parts of sodium bicarbonate, 0.1-0.2 parts of potassium persulfate, 8-10 parts of vinyl acetate, 0.3-0.4 parts of modified carbon nanotubes, and 25-30 parts of chlorotrifluoroethylene.

4. The process for preparing a corrosion-resistant, heat-dissipating fluorocarbon resin coating according to claim 1, characterized in that: The preparation process of the modified carbon nanotubes is as follows: S1: Add 2-amino-4-hydroxy-6-methylpyrimidine to anhydrous dimethyl sulfoxide, stir at 170-180°C for 10-15 minutes, then cool the reaction solution to 0°C, slowly add ethyl isocyanate methacrylate, react for 1-2 hours, centrifuge, and wash to obtain a modified monomer; S2: Mix the modified monomer, vinyl acetate, maleic anhydride, and N,N-dimethylformamide, raise the temperature to 60-70°C, slowly add the azobisisobutyronitrile solution dropwise, and after the addition is complete, reflux for 10-12 hours. After the reaction is complete, post-treat to obtain a terpolymer; S3: Add oxidized carbon nanotubes to ethyl acetate, add 3-aminopropyltriethoxysilane and deionized water, increase the temperature to 70-80°C, reflux for 10-12 hours, filter, wash, and obtain amino carbon nanotubes; then mix the terpolymer, N,N-dimethylformamide, and amino carbon nanotubes, stir at room temperature for 4-5 hours, filter, wash, and dry to obtain modified carbon nanotubes.

5. The process for preparing a corrosion-resistant, heat-dissipating fluorocarbon resin coating according to claim 4, characterized in that: The modified monomer raw material comprises the following components: 4-5 parts by weight of 2-amino-4-hydroxy-6-methylpyrimidine, 50-60 parts by weight of anhydrous dimethyl sulfoxide, and 5-6 parts by weight of ethyl isocyanate methacrylate.

6. The process for preparing a corrosion-resistant, heat-dissipating fluorocarbon resin coating according to claim 4, characterized in that: The terpolymer raw material comprises the following components: by weight, 10-12 parts of a modified monomer, 15-18 parts of vinyl acetate, 5-6 parts of maleic anhydride, 70-80 parts of N,N-dimethylformamide, and 2-3 parts of azobisisobutyronitrile solution; wherein the concentration of the azobisisobutyronitrile solution is 10 wt%.

7. The process for preparing a corrosion-resistant, heat-dissipating fluorocarbon resin coating according to claim 4, characterized in that: The amination carbon nanotube raw material comprises the following components: by weight, 10-12 parts of oxidized carbon nanotubes, 100-120 parts of ethyl acetate, 0.5-1 part of 3-aminopropyltriethoxysilane, and 0.3-1 part of deionized water.

8. The process for preparing a corrosion-resistant, heat-dissipating fluorocarbon resin coating according to claim 4, characterized in that: The modified carbon nanotube raw material comprises the following components: by weight, 10-20 parts of terpolymer, 70-80 parts of N,N-dimethylformamide, and 5-6 parts of amino carbon nanotubes.

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