Corrosion-resistant clinkering epoxy coating for cage guide and preparation method of corrosion-resistant clinkering epoxy coating

Abstract

The invention relates to the field of coatings, in particular to a corrosion-resistant clinkering epoxy coating for a cage guide and a preparation method of the corrosion-resistant clinkering epoxy coating. The corrosion-resistant sintered epoxy coating for the cage guide comprises the following raw materials: epoxy resin, an accelerant, composite coated particles, a dispersing agent, a curing agent, a flatting agent and the like. The solvent-bonded epoxy coating prepared by the invention not only has excellent corrosion resistance, but also can effectively maintain the water resistance, aging resistance and wear resistance of the coating, so that the application requirements of a wet cage guide or a cage guide containing corrosive gas are met, the solvent-bonded epoxy coating has very excellent market prospects, and a new solution thought is provided for a coating material of the cage guide.

Description

Technical Field

[0001] The present application relates to the field of coatings, and in particular to a corrosion-resistant fused epoxy coating for tank channels and a preparation method thereof. Background Art

[0002] With the continuous development of economy and industry, people's demand for coatings is also increasing. In particular, coatings with specific or high performance properties are in high demand in different fields and environments. Among them, the tankway is a key component of the mine hoisting system. The coating protection can effectively improve its wear and corrosion resistance, significantly enhancing the efficiency, safety and economic efficiency of the tankway.

[0003] The tankway is installed along the shaft axis, fixed to the tankway beam or directly suspended from the derrick. This ensures that the hoisting container can move precisely along the predetermined path while also helping to limit the risk of accidental falls. It is an essential safety feature in the hoisting system. The design and selection of the tankway must be considered comprehensively based on multiple factors, including the specific conditions of the mine, the type of hoisting container, the hoisting speed, and economic efficiency. The coating used also requires additional performance considerations.

[0004] Judging from the existing application environment of tank tunnels, the coatings used therein have high requirements for corrosion resistance, waterproofness, aging resistance, wear resistance and noise reduction. However, the existing coating materials cannot effectively adjust their overall comprehensive performance according to the application environment of tank tunnels, and the overall selection of coating materials for tank tunnels is scarce.

[0005] Therefore, in order to effectively solve the above problems, the present application provides a fused epoxy coating dedicated to tank channels. The fused epoxy coating prepared in the present application not only has excellent corrosion resistance, but can also effectively maintain the waterproof, aging-resistant and wear-resistant properties of the coating, thereby meeting the application requirements of tank channels that are humid or contain corrosive gases. It has a very excellent market prospect and provides a new solution for tank channel coating materials. Summary of the Invention

[0006] In order to solve the above problems, the first aspect of the present application provides a corrosion-resistant fused epoxy coating for tank channels. The raw materials include, by mass: 60 to 80 parts of epoxy resin, 1 to 6 parts of accelerator, 15 to 25 parts of composite coated particles, 1 to 8 parts of dispersant, 5 to 10 parts of curing agent, 1 to 3 parts of leveling agent, 1 to 3 parts of defoaming agent, and 0.5 to 3 parts of antioxidant.

[0007] As a preferred solution, the mass ratio of the epoxy resin, the composite coated particles and the dispersant is (7-8): (1.8-2.2): (0.5-0.7).

[0008] As a preferred solution, the mass ratio of the epoxy resin, the composite coated particles and the dispersant is (7.5-8):2:0.6.

[0009] As a preferred solution, the epoxy resin is a composition of phenolic modified epoxy resin and bisphenol F epoxy resin.

[0010] As a preferred solution, the mass ratio of the phenolic modified epoxy resin to the bisphenol F epoxy resin is (1-2): (4-5).

[0011] As a preferred solution, the mass ratio of the phenolic modified epoxy resin to the bisphenol F epoxy resin is (1-1.5): (4-4.5).

[0012] As a preferred solution, the epoxy equivalent of the bisphenol F epoxy resin is 150-200 g / eq.

[0013] As a preferred solution, the average viscosity of the bisphenol F epoxy resin is 2000-5000 cps / 25°C.

[0014] As a preferred solution, the average viscosity of the bisphenol F epoxy resin is 2500-3500 cps / 25°C.

[0015] As a preferred solution, the accelerator is at least one of 2-methylimidazole, 2-ethylimidazole, cobalt octoate, zinc naphthenate, triethylenetetramine, and diethylenetriamine.

[0016] As a preferred solution, the accelerator is 2-methylimidazole.

[0017] As a preferred solution, the preparation method of the composite coated particles includes the following steps: S1: adding mica powder, magnesium fluoride and aluminum oxide in proportion to a ball mill, adding anhydrous ethanol to immerse the raw materials, adding polyvinyl pyrrolidone, and ball milling at a ball-to-material ratio of (4-5):1 and a speed of 300-400 rpm for 3-4 hours; S2: transferring the slurry after ball milling to a spray dryer with an inlet air temperature of 180-200°C and an outlet air temperature of 90-100°C, collecting the dry powder, adding the dry powder, polytetrafluoroethylene, and nano-titanium dioxide to a high-speed mixer with a speed of 1300-1500 rpm and high-speed mixing at 25-35°C for 20-30 minutes to obtain a mixed powder; S3: placing the mixed powder in a muffle furnace, heating it to 350-380°C at a speed of 4.5-5°C / min, keeping it warm for 2-3 hours, naturally cooling it to room temperature after completion, and passing it through an 800-1000 mesh sieve to obtain the obtained product.

[0018] As a preferred solution, the average particle size of the nano-titanium dioxide is 10-25 nm.

[0019] As a preferred solution, the average particle size of the mica powder is 10-15 μm.

[0020] As a preferred solution, the average particle size of the magnesium fluoride is 100-150 nm; the average particle size of the aluminum oxide is 50-80 nm.

[0021] As a preferred solution, the average particle size of the polytetrafluoroethylene is 1-2 μm.

[0022] As a preferred solution, the mass ratio of the mica powder, magnesium fluoride, aluminum oxide, polytetrafluoroethylene and nano-titanium dioxide is (5-6): (1.5-1.8): (1.2-1.6): (2.5-3): (1.5-2).

[0023] As a preferred solution, the dispersant is fatty alcohol polyoxyethylene ether.

[0024] As a preferred solution, the fatty alcohol polyoxyethylene ether is a composition of isomeric 13 fatty alcohol polyoxyethylene ether and cetearyl alcohol polyoxyethylene ether.

[0025] As a preferred solution, the mass ratio of the isomeric 13-fatty alcohol polyoxyethylene ether and the cetearyl alcohol polyoxyethylene ether is (2-4): (0.8-1.4).

[0026] As a preferred solution, the hydroxyl value of the isomeric 13-fatty alcohol polyoxyethylene ether is 60-80 mgKOH / g.

[0027] As a preferred solution, the hydroxyl value of the cetearyl alcohol polyoxyethylene ether is 140-180 mgKOH / g.

[0028] In the present application, by adding the above-mentioned composite dispersant, it is not only possible to effectively help the dispersion effect of the composite coated particles in the epoxy resin system, but also possible to effectively improve the waterproof and aging resistance of the coating. In the present application, by adding the above-mentioned composite dispersant, it is possible to achieve segment embedding of epoxy resin segments with different hydroxyl values ​​and different segment lengths, thereby forming a more dense three-dimensional network structure through the coordination of long and short segments, increasing the entanglement strength and intermolecular force between the segments, reducing intermolecular steric hindrance, thereby increasing the penetration resistance and path length of the active molecules, and thus being able to maintain good property stability in harsh environments, avoiding the denaturation phenomenon caused by chemical reactions, and a more dense network structure can promote the formation of a dense epidermis, thereby significantly increasing the difficulty of forming a surface hydration layer, and thus effectively improving waterproof performance.

[0029] As a preferred solution, the curing agent is at least one of a dicyandiamide curing agent, a phenolic resin modified curing agent, and an acid anhydride curing agent.

[0030] As a preferred solution, the curing agent is a dicyandiamide curing agent.

[0031] As a preferred solution, the leveling agent is at least one of an acrylate leveling agent, a silicone leveling agent, and epoxidized soybean oil.

[0032] As a preferred solution, the leveling agent is epoxidized soybean oil.

[0033] As a preferred solution, the defoaming agent is at least one of silicone defoaming agents.

[0034] As a preferred solution, the antioxidant is at least one of antioxidant 1010, antioxidant 1076, antioxidant 1135, antioxidant 1098, and antioxidant 268.

[0035] As a preferred solution, the antioxidant is antioxidant 1010 or antioxidant 268.

[0036] The second aspect of the present application provides a method for preparing the above-mentioned corrosion-resistant fused epoxy coating for the tank channel, and the preparation method comprises the following steps: S1: weighing all raw materials according to the required weight parts, mixing them and adding them to a high-speed mixer to mix evenly to obtain a mixture; S2: adding the mixture to a twin-screw extruder for melt extrusion, the extrusion temperature is 120~140℃, the extrusion frequency is 65~85Hz, the extruded material is roller-cooled, and after grinding and sieving, the fused epoxy coating is obtained.

[0037] This application has the following beneficial effects:

[0038] 1. The present application provides a corrosion-resistant fused epoxy coating for tank ducts, which not only has excellent corrosion resistance, but also can effectively maintain the coating's waterproof, aging-resistant and wear-resistant properties, thereby meeting the application requirements of tank ducts that are humid or contain corrosive gases. It has excellent market prospects and provides a new solution for tank duct coating materials.

[0039] 2. The present application provides a corrosion-resistant fused epoxy coating for tanks. The added composite coated particles can not only achieve a good dispersion effect in the resin system, but can also further form a MgF2 / Al2O3 composite layer to resist acid and alkali corrosion, and promote the formation of a surface fluorine segment layer, thereby ensuring the surface hydrophobicity and low surface energy, while also significantly improving the anti-penetration resistance to water molecules, reducing their diffusion path, and thus improving the overall performance of the fused epoxy coating as a whole.

[0040] 3. The present application provides a corrosion-resistant fused epoxy coating for tanks. The added composite dispersant can not only effectively help the dispersion effect of the composite coated particles in the epoxy resin system, but also effectively improve the waterproof and aging resistance of the coating; the addition of the composite dispersant can achieve the embedding of chain segments with different hydroxyl values ​​and different segment lengths into the epoxy resin, thereby forming a denser three-dimensional network structure through the coordination of long and short chain segments, increasing the entanglement strength and intermolecular force between the chain segments, reducing intermolecular steric hindrance, thereby increasing the penetration resistance and path length of active molecules, and thus maintaining good property stability even in harsh environments, avoiding denaturation due to chemical reactions, and a denser network structure can promote the formation of a dense epidermis. DETAILED DESCRIPTION

[0041] The following will further explain and demonstrate the technical solutions in the above invention content of this application in the form of specific implementation plans.

[0042] Example 1

[0043] A corrosion-resistant fusion-bonded epoxy coating for tank channels, comprising, by weight, 78 parts of epoxy resin, 3 parts of accelerator, 20 parts of composite coated particles, 6 parts of dispersant, 6 parts of curing agent, 2 parts of leveling agent, 1 part of defoaming agent, and 2 parts of antioxidant.

[0044] The epoxy resin is a composition of phenolic modified epoxy resin and bisphenol F epoxy resin, and the mass ratio of the two is 1.2:4.3.

[0045] The phenolic modified epoxy resin was purchased from Baling Petrochemical's 704 epoxy resin; the bisphenol F epoxy resin was purchased from Mitsubishi of Japan as a JER807 F170 product with an epoxy equivalent of 180 g / eq and an average viscosity of 3000 cps / 25°C.

[0046] The accelerator is 2-methylimidazole.

[0047] The preparation method of composite coated particles includes the following steps, calculated by mass: S1: 5.4 parts of mica powder, 1.6 parts of magnesium fluoride and 1.5 parts of aluminum oxide are added in proportion to a ball mill, 40 parts of anhydrous ethanol are added to immerse the raw materials, 0.5 parts of polyvinyl pyrrolidone K30 are added, and the ball-to-material ratio is 5:1 and the speed is 400 rpm. Ball milling is carried out for 3 hours; S2: the slurry after ball milling is transferred to a spray dryer with an air inlet temperature of 200°C and an air outlet temperature of 100°C, and the dry powder is collected. The dry powder, 2.8 parts of polytetrafluoroethylene and 1.8 parts of nano titanium dioxide are added to a high-speed mixer with a speed of 1500 rpm and high-speed mixing at 30°C for 30 minutes to obtain a mixed powder; S3: the mixed powder is placed in a muffle furnace, heated to 360°C at a speed of 5°C / min, kept warm for 2 hours, and naturally cooled to room temperature after completion, and passed through an 850-mesh sieve to obtain the obtained product.

[0048] The average particle size of nano-titanium dioxide is 20nm.

[0049] The average particle size of the mica powder is 11.5 μm.

[0050] The average particle size of magnesium fluoride is 125 nm; the average particle size of aluminum oxide is 55 nm.

[0051] The average particle size of polytetrafluoroethylene is 1.5 μm, and the corresponding particle size product was purchased from China Baiyi New Materials Technology (Dongguan) Co., Ltd.

[0052] The dispersant is a composition of isomeric 13-fatty alcohol polyoxyethylene ether and cetearyl alcohol polyoxyethylene ether, with a mass ratio of the two being 2.8:1.

[0053] Isomerized 13 fatty alcohol polyoxyethylene ether was purchased from E-1312 product sold by Hai'an Guoyun Chemical, with an average hydroxyl value of 78 mgKOH / g; cetearyl alcohol polyoxyethylene ether was purchased from O-3 product sold by Hai'an Guoyun Chemical, with an average hydroxyl value of 145 mgKOH / g.

[0054] The curing agent is dicyandiamide curing agent K7108, which was purchased from Lu'an Jietongda.

[0055] The leveling agent is epoxidized soybean oil, which is an industrial-grade epoxidized acrylic soybean oil product purchased from Shandong Polychemical.

[0056] The defoaming agent is silicone defoaming agent BYK-088; the antioxidant is antioxidant 1010.

[0057] A method for preparing a corrosion-resistant fused epoxy coating for a tank channel comprises the following steps: S1: weighing all raw materials according to the required weight parts, adding the mixed materials to a high-speed mixer and mixing them evenly to obtain a mixture; S2: adding the mixture to a twin-screw extruder for melt extrusion at an extrusion temperature of 125°C and an extrusion frequency of 70 Hz, cooling the extruded material with a roller, grinding and sieving, and thus obtaining a fused epoxy coating.

[0058] Example 2

[0059] A corrosion-resistant fusion-bonded epoxy coating for tank channels, comprising, by weight, 70 parts of epoxy resin, 3 parts of accelerator, 22 parts of composite coated particles, 5 parts of dispersant, 6 parts of curing agent, 2 parts of leveling agent, 1 part of defoaming agent, and 2 parts of antioxidant.

[0060] The epoxy resin is a composition of phenolic modified epoxy resin and bisphenol F epoxy resin, and the mass ratio of the two is 1:5.

[0061] The phenolic modified epoxy resin was purchased from Baling Petrochemical's 704 epoxy resin; the bisphenol F epoxy resin was purchased from Mitsubishi of Japan as a JER807 F170 product with an epoxy equivalent of 180 g / eq and an average viscosity of 3000 cps / 25°C.

[0062] The accelerator is 2-methylimidazole.

[0063] The preparation method of composite coated particles includes the following steps, calculated in parts by mass: The preparation method of composite coated particles includes the following steps, calculated in parts by mass: S1: 5.4 parts of mica powder, 1.6 parts of magnesium fluoride and 1.5 parts of aluminum oxide are added in proportion to a ball mill, 40 parts of anhydrous ethanol are added to immerse the raw materials, 0.5 parts of polyvinyl pyrrolidone K30 are added, and the ball-to-material ratio is 5:1 and the speed of ball milling is 400 rpm for 3 hours; S2: the slurry after ball milling is transferred to a spray dryer with an inlet air temperature of 200°C and an outlet air temperature of 100°C, the dry powder is collected, and the dry powder, 2.8 parts of polytetrafluoroethylene and 1.8 parts of nano titanium dioxide are added to a high-speed mixer with a speed of 1500 rpm and high-speed mixing at 30°C for 30 minutes to obtain a mixed powder; S3: the mixed powder is placed in a muffle furnace, heated to 360°C at 5°C / min, kept warm for 2 hours, naturally cooled to room temperature after completion, and passed through an 850-mesh sieve to obtain.

[0064] The average particle size of nano-titanium dioxide is 20nm.

[0065] The average particle size of the mica powder is 11.5 μm.

[0066] The average particle size of magnesium fluoride is 125 nm; the average particle size of aluminum oxide is 55 nm.

[0067] The average particle size of polytetrafluoroethylene is 1.5 μm, and the corresponding particle size product was purchased from China Baiyi New Materials Technology (Dongguan) Co., Ltd.

[0068] The dispersant is a composition of isomeric 13-fatty alcohol polyoxyethylene ether and cetearyl alcohol polyoxyethylene ether, with a mass ratio of the two being 2.8:1.

[0069] Isomerized 13 fatty alcohol polyoxyethylene ether was purchased from E-1312 product sold by Hai'an Guoyun Chemical, with an average hydroxyl value of 78 mgKOH / g; cetearyl alcohol polyoxyethylene ether was purchased from O-3 product sold by Hai'an Guoyun Chemical, with an average hydroxyl value of 145 mgKOH / g.

[0070] The curing agent is dicyandiamide curing agent K7108, which was purchased from Lu'an Jietongda.

[0071] The leveling agent is epoxidized soybean oil, which is an industrial-grade epoxidized acrylic soybean oil product purchased from Shandong Polychemical.

[0072] The defoaming agent is silicone defoaming agent BYK-088; the antioxidant is antioxidant 1010.

[0073] A method for preparing a corrosion-resistant fused epoxy coating for a tank channel comprises the following steps: S1: weighing all raw materials according to the required weight parts, adding the mixed materials to a high-speed mixer and mixing them evenly to obtain a mixture; S2: adding the mixture to a twin-screw extruder for melt extrusion at an extrusion temperature of 125°C and an extrusion frequency of 70 Hz, cooling the extruded material with a roller, grinding and sieving, and thus obtaining a fused epoxy coating.

[0074] Comparative Example 1

[0075] The only difference between this comparative example and Example 1 is that the corrosion-resistant fused epoxy coating of the tank channel, calculated by mass, includes the following raw materials: 100 parts of epoxy resin, 3 parts of accelerator, 10 parts of composite coated particles, 3 parts of dispersant, 6 parts of curing agent, 2 parts of leveling agent, 1 part of defoaming agent, and 2 parts of antioxidant.

[0076] Comparative Example 2

[0077] The difference between this comparative example and Example 1 is only that: the preparation method of composite coated particles comprises the following steps, calculated by mass: S1: 8.5 parts of mica powder, 1.1 parts of magnesium fluoride and 0.5 parts of aluminum oxide are added to a ball mill in proportion, 40 parts of anhydrous ethanol are added to immerse the raw materials, 0.5 parts of polyvinyl pyrrolidone K30 are added, and the ball-to-material ratio is 5:1 and the speed is 400 rpm. Ball milling for 3 hours; S2: the slurry after ball milling is transferred to a spray dryer with an inlet air temperature of 200°C and an outlet air temperature of 100°C, and the dry powder is collected. The dry powder and 2.5 parts of polytetrafluoroethylene and 2 parts of nano titanium dioxide are added to a high-speed mixer with a speed of 1500 rpm and high-speed mixing at 30°C for 30 minutes to obtain a mixed powder; S3: the mixed powder is placed in a muffle furnace, heated to 360°C at 5°C / min, kept warm for 2 hours, and then naturally cooled to room temperature after completion, and passed through an 850 mesh sieve.

[0078] Comparative Example 3

[0079] The difference between this comparative example and Example 1 is only that: the preparation method of composite coated particles comprises the following steps, calculated by mass: S1: 3 parts of mica powder, 2.5 parts of magnesium fluoride and 2 parts of aluminum oxide are added to a ball mill in proportion, 40 parts of anhydrous ethanol are added to immerse the raw materials, 0.5 parts of polyvinyl pyrrolidone K30 are added, and the ball-to-material ratio is 5:1 and the speed is 400 rpm. Ball milling for 3 hours; S2: the slurry after ball milling is transferred to a spray dryer with an inlet air temperature of 200°C and an outlet air temperature of 100°C, and the dry powder is collected. The dry powder, 1.4 parts of polytetrafluoroethylene, and 0.5 parts of nano titanium dioxide are added to a high-speed mixer with a speed of 1500 rpm and high-speed mixing at 30°C for 30 minutes to obtain a mixed powder; S3: the mixed powder is placed in a muffle furnace, heated to 360°C at 5°C / min, kept warm for 2 hours, and then naturally cooled to room temperature after completion, and passed through an 850 mesh sieve.

[0080] Comparative Example 4

[0081] The only difference between this comparative example and Example 1 is that the average particle size of nano-titanium dioxide is 60 nm.

[0082] The average particle size of the mica powder is 20.5 μm; the average particle size of the alumina is 55 nm.

[0083] The average particle size of polytetrafluoroethylene is 3.5 μm, and the corresponding particle size product was purchased from China Baiyi New Materials Technology (Dongguan) Co., Ltd.

[0084] Comparative Example 5

[0085] The only difference between this comparative example and Example 1 is that the dispersant is a composition of isomeric 13-fatty alcohol polyoxyethylene ether and cetearyl alcohol polyoxyethylene ether, and the mass ratio of the two is 6:1.

[0086] Comparative Example 6

[0087] The only difference between this comparative example and Example 1 is that the dispersant is a composition of isomeric 13-fatty alcohol polyoxyethylene ether and cetearyl alcohol polyoxyethylene ether, and the mass ratio of the two is 1:1.

[0088] The isomeric 13-fatty alcohol polyoxyethylene ether was purchased from E-1302 product sold by Hai'an Guoyun Chemical, with an average hydroxyl value of 195 mgKOH / g.

[0089] Comparative Example 7

[0090] The only difference between this comparative example and Example 1 is that cetearyl alcohol polyoxyethylene ether was purchased from O-9 product sold by Hai'an Guoyun Chemical, and the average hydroxyl value was 86 mgKOH / g.

[0091] Performance evaluation

[0092] 1. The coatings prepared in the examples and comparative examples were subjected to a cathodic disbonding resistance test according to the reference standard SY / T0315-1997. The test conditions were: 1.5 V, 20° C., 28 d. The measured results are recorded in Table 1.

[0093] 2. The coatings prepared in the examples and comparative examples were used to prepare sintered coatings with a coating thickness of 400 μm. The surface water contact angles of the sintered coatings prepared in the examples and comparative examples were tested using the sessile drop method with a drop of 1.5 μL and a time of 10 s. The measured values ​​were averaged over 10 tests and recorded in Table 1.

[0094] 3. A sintered coating was prepared using the coatings prepared in the examples and comparative examples. The coating thickness was 400 μm. The coating sample was placed in a constant temperature and humidity chamber at 65±2°C and 75% humidity for 28 days. The coating was subjected to a flattening test according to the method of CJ / T120-2016 to observe whether the coating had cracks or peeling. The test results are recorded in Table 1.

[0095] Table 1 Performance evaluation results

[0096] From the examples and comparative examples of the present application and the data results in Table 1, it can be seen that Examples 1 and 2 have obvious performance advantages over Comparative Examples 1 to 7 in terms of water resistance, corrosion resistance and aging resistance. The composite dispersant of Example 1 and Example 2 using a better technical solution can not only effectively help the dispersion effect of the composite coated particles in the epoxy resin system, but also effectively improve the water resistance and aging resistance of the coating; the addition of the composite dispersant can achieve the embedding of chain segments with different hydroxyl values ​​and different segment lengths into the epoxy resin, thereby forming a denser three-dimensional network structure through the coordination of long and short chain segments, increasing the entanglement strength and intermolecular force between the chain segments, reducing the intermolecular steric hindrance, thereby increasing the penetration resistance and path length of the active molecules, and thus maintaining good property stability even in harsh environments.

Claims

1. A corrosion-resistant fusion-bonded epoxy coating for a tank channel, characterized by: The raw materials of the corrosion-resistant fusion-bonded epoxy coating for tank channels, calculated by mass, include: 60-80 parts of epoxy resin, 1-6 parts of accelerator, 15-25 parts of composite coated particles, 1-8 parts of dispersant, 5-10 parts of curing agent, 1-3 parts of leveling agent, 1-3 parts of defoaming agent, and 0.5-3 parts of antioxidant; The epoxy resin is a composition of phenolic modified epoxy resin and bisphenol F epoxy resin, with a mass ratio of (1-2): (4-5); The preparation method of the composite coated particles comprises the following steps: S1: adding mica powder, magnesium fluoride and aluminum oxide in proportion to a ball mill, adding anhydrous ethanol to immerse the raw materials, adding polyvinyl pyrrolidone, and ball milling at a ball-to-material ratio of (4-5):1 at a speed of 300-400 rpm for 3-4 hours; S2: transferring the ball-milled slurry to a spray dryer with an inlet air temperature of 180-200° C. and an outlet air temperature of 90-100° C., collecting the dried powder, adding the dried powder, polytetrafluoroethylene and nano-titanium dioxide to a high-speed mixer with a speed of 1300-1500 rpm and high-speed mixing at 25-35° C. for 20-30 minutes to obtain a mixed powder; S3: placing the mixed powder in a muffle furnace, heating it to 350-380° C. at a speed of 4.5-5° C. / min, keeping it warm for 2-3 hours, naturally cooling it to room temperature after completion, and passing it through an 800-1000 mesh sieve to obtain the obtained powder; The average particle size of the nano titanium dioxide is 10-25 nm; the average particle size of the magnesium fluoride is 100-150 nm; the average particle size of the aluminum oxide is 50-80 nm; The mass ratio of the mica powder, magnesium fluoride, aluminum oxide, polytetrafluoroethylene and nano-titanium dioxide is (5-6): (1.5-1.8): (1.2-1.6): (2.5-3): (1.5-2).

2. The corrosion-resistant fusion-bonded epoxy coating for tank channel according to claim 1, characterized in that: The mass ratio of the epoxy resin, the composite coated particles and the dispersant is (7-8): (1.8-2.2): (0.5-0.7).

3. The corrosion-resistant fusion-bonded epoxy coating for tank channel according to claim 2, characterized in that: The accelerator is at least one of 2-methylimidazole, 2-ethylimidazole, cobalt octoate, zinc naphthenate, triethylenetetramine, and diethylenetriamine.

4. The corrosion-resistant fusion-bonded epoxy coating for tank channel according to claim 3, characterized in that: The dispersant is fatty alcohol polyoxyethylene ether.

5. The corrosion-resistant fusion-bonded epoxy coating for tank channel according to claim 4, characterized in that: The fatty alcohol polyoxyethylene ether is a composition of isomeric 13 fatty alcohol polyoxyethylene ether and cetearyl alcohol polyoxyethylene ether.

6. The corrosion-resistant fusion-bonded epoxy coating for tank channel according to claim 5, characterized in that: The mass ratio of the isomeric 13-fatty alcohol polyoxyethylene ether to the cetearyl alcohol polyoxyethylene ether is (2-4): (0.8-1.4).

7. The corrosion-resistant fusion-bonded epoxy coating for tank channel according to claim 6, characterized in that: The hydroxyl value of the isomeric 13-fatty alcohol polyoxyethylene ether is 60-80 mgKOH / g; the hydroxyl value of the cetearyl alcohol polyoxyethylene ether is 140-180 mgKOH / g.

8. The corrosion-resistant fusion-bonded epoxy coating for tank channel according to claim 7, characterized in that: The curing agent is at least one of a dicyandiamide curing agent, a phenolic resin modified curing agent, and an acid anhydride curing agent.

9. The corrosion-resistant fusion-bonded epoxy coating for tank channel according to claim 8, characterized in that: The leveling agent is epoxidized soybean oil.

10. A method for preparing a corrosion-resistant fusion-bonded epoxy coating for a tank channel according to any one of claims 1 to 8, characterized in that: S1: Weigh all raw materials according to the required weight parts, mix them and add them to a high-speed mixer for uniform mixing to obtain a mixture; S2: Add the mixture to a twin-screw extruder for melt extrusion at an extrusion temperature of 120-140°C and an extrusion frequency of 65-85 Hz. The extruded material is roller-cooled, ground and sieved to obtain a fused epoxy coating.

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