Graphene zinc water-based heavy anti-corrosion coating with high solid content and application of graphene zinc water-based heavy anti-corrosion coating

Abstract

The invention relates to the technical field of anti-corrosion coatings, in particular to a high-solid-content graphene zinc water-based heavy anti-corrosion coating and application thereof.The anti-corrosion coating is prepared from, by weight, 35-40 parts of water-based epoxy resin, 15-20 parts of modified graphene, 7-11 parts of functional auxiliaries, 20-25 parts of deionized water, 3-5 parts of modified additives and 5-8 parts of nano zinc powder. According to an ultra-long-acting anti-corrosion performance synergistic protection mechanism, the unique two-dimensional lamellar structure of the graphene and the nano zinc powder form a dual protection system of physical shielding and electrochemical protection, and the toughness of the coating is enhanced through the synergistic effect of the modified graphene, the calcium sulfate whiskers, the carbon nanotubes and other fillers; the modified graphene prepared by a ball milling process is uniformly dispersed in the resin to form a flexible network structure which can absorb impact energy.

Description

Technical Field

[0001] This invention relates to the field of anti-corrosion coating technology, specifically to a high-solids-content graphene zinc water-based heavy-duty anti-corrosion coating and its application. Background Technology

[0002] Metal corrosion is a major problem in the industrial field. As the core means of metal protection, heavy-duty anti-corrosion coatings directly determine the protective effect and cycle. Traditional heavy-duty anti-corrosion coatings are mainly solvent-based, but their high emissions of volatile organic compounds (VOCs) seriously pollute the environment and do not meet the requirements of current environmental protection policies. Water-based heavy-duty anti-corrosion coatings, because they use water as a dispersion medium, have low VOC content and have become the industry trend. In order to optimize the anti-corrosion performance of anti-corrosion coatings, existing technologies can easily affect the adhesion and impact resistance of the coatings. At the same time, the poor weather resistance of the coatings limits the efficiency of their use. Based on this, the present invention further improves them. Summary of the Invention

[0003] In view of the deficiencies of the prior art, the purpose of this invention is to provide a high-solids-content graphene zinc water-based heavy-duty anti-corrosion coating and its application, so as to solve the problems mentioned in the background art.

[0004] The present invention solves the technical problem by adopting the following technical solution: This invention provides a high-solids-content graphene zinc waterborne heavy-duty anti-corrosion coating, the anti-corrosion coating comprising the following raw materials in parts by weight: 35-40 parts waterborne epoxy resin, 15-20 parts modified graphene, 7-11 parts functional additives, 20-25 parts deionized water, 3-5 parts modified additives, and 5-8 parts nano zinc powder.

[0005] Preferably, the waterborne epoxy resin has an epoxy equivalent of 400-600 g / eq and a solid content of 50-70%; the functional additives are 3-5 parts by weight of defoamer, 2-4 parts by weight of leveling agent, 1-3 parts by weight of silane coupling agent, and 3-5 parts by weight of film-forming aid. The defoamer is an organosilicon defoamer; the leveling agent is an acrylate leveling agent; the silane coupling agent is silane coupling agent KH560; and the film-forming aid is dodecyl alcohol ester.

[0006] Preferably, the modified graphene is prepared by: S01: Mix 3-5 parts of nanocellulose, 2-4 parts of calcium sulfate whisker agent, 4-7 parts of sodium dodecylbenzenesulfonate solution and 1-2 parts of silane coupling agent KH550 evenly to obtain a compound solution; S02: Heat-treat kaolin at 135-145℃ for 5-10 min, then cool it to 55℃ at a rate of 3-5℃ / min and keep it at that temperature; mix the kept-temperature kaolin and conditioning liquid at a weight ratio of 3:(6-9) and after mixing, filter and dry to obtain the conditioned kaolin agent. The preparation method of the conditioning solution is as follows: 2-5 parts silicon carbide, 3-5 parts lanthanum chloride solution and 1-2 parts flake alumina are thoroughly mixed to obtain the conditioning solution; S03: The compounding liquid and the adjusted kaolin agent were ball-milled at a weight ratio of (5-8):11, with a ball milling speed of 1500-1700 r / min for 2 hours. After ball milling, the mixture was filtered and dried to obtain modified graphene.

[0007] Preferably, the sodium dodecylbenzenesulfonate solution has a mass fraction of 8-12%; the stirring speed for the stirring adjustment process is 450-550 r / min, and the stirring time is 1 h.

[0008] Preferably, the lanthanum chloride solution has a mass fraction of 2-5%.

[0009] Preferably, the calcium sulfate whisker agent is prepared by: S11: Preheat calcium sulfate whiskers at 130-140℃ for 1 hour, then immerse them in a sufficient amount of yttrium nitrate solution and stir thoroughly. Then filter and dry to obtain yttrium-doped calcium sulfate whiskers. S12: The yttrium-doped calcium sulfate whiskers and carbon nanotube liquid were ball-milled at a weight ratio of (11-15):5. The ball milling speed was 1000-1500 r / min and the milling time was 2 h. After the ball milling was completed, the mixture was filtered and dried to obtain the calcium sulfate whisker agent.

[0010] Preferably, the yttrium nitrate solution has a mass fraction of 2-5%.

[0011] Preferably, the carbon nanotube liquid comprises the following raw materials in parts by weight: 2-5 parts carbon nanotubes, 1-3 parts silane coupling agent KH550 and 5-8 parts glass fiber, 2-4 parts nano zeolite powder and 5-8 parts sodium alginate solution with a mass fraction of 5%.

[0012] Preferably, the modified additive is prepared by mixing nano-titanium dioxide, β-cyclodextrin, silane coupling agent KH560, and 85% ethanol solution in a weight ratio of (3-5):2:1:(5-8) to obtain the modified additive.

[0013] This invention also provides an application of a high-solids-content graphene zinc water-based heavy-duty anti-corrosion coating in heavy-duty anti-corrosion of metal substrates.

[0014] Compared with the prior art, the present invention has the following beneficial effects: This invention features a synergistic protection mechanism for ultra-long-lasting corrosion resistance. The unique two-dimensional sheet structure of graphene and nano-zinc powder form a dual protection system of "physical shielding + electrochemical protection." The synergistic effect of modified graphene and fillers such as calcium sulfate whiskers and carbon nanotubes enhances the toughness of the coating. Modified graphene, prepared by ball milling, is uniformly dispersed in the resin to form a flexible network structure that can absorb impact energy and optimize the product's corrosion resistance and UV resistance. Nano-titanium dioxide (TiO2) in the modified additive has a high UV absorption capacity, which can improve the coating's UV aging resistance and optimize its corrosion resistance. The coating has good leveling and thixotropic properties and can be applied by spraying, brushing, or rolling. A single film thickness of 100-125μm can be achieved, reducing the number of application layers. The high solids content design also reduces shrinkage stress during the coating drying process, avoiding the risk of cracking. It is suitable for complex-shaped metal substrates. Detailed Implementation

[0015] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to specific examples. 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.

[0016] This embodiment provides a high-solids-content graphene zinc waterborne heavy-duty anti-corrosion coating, which comprises the following raw materials in parts by weight: 35-40 parts waterborne epoxy resin, 15-20 parts modified graphene, 7-11 parts functional additives, 20-25 parts deionized water, 3-5 parts modified additives, and 5-8 parts nano zinc powder.

[0017] In this embodiment, the epoxy equivalent of the waterborne epoxy resin is 400-600 g / eq, and the solid content is 50-70%; the functional additives are 3-5 parts by weight of defoamer, 2-4 parts by weight of leveling agent, 1-3 parts by weight of silane coupling agent, and 3-5 parts by weight of film-forming aid. The defoamer is an organosilicon defoamer; the leveling agent is an acrylate leveling agent; the silane coupling agent is silane coupling agent KH560; and the film-forming aid is dodecyl alcohol ester.

[0018] The method for preparing the modified graphene in this embodiment is as follows: S01: Mix 3-5 parts of nanocellulose, 2-4 parts of calcium sulfate whisker agent, 4-7 parts of sodium dodecylbenzenesulfonate solution and 1-2 parts of silane coupling agent KH550 evenly to obtain a compound solution; S02: Heat-treat kaolin at 135-145℃ for 5-10 min, then cool it to 55℃ at a rate of 3-5℃ / min and keep it at that temperature; mix the kept-temperature kaolin and conditioning liquid at a weight ratio of 3:(6-9) and after mixing, filter and dry to obtain the conditioned kaolin agent. The preparation method of the conditioning solution is as follows: 2-5 parts silicon carbide, 3-5 parts lanthanum chloride solution and 1-2 parts flake alumina are thoroughly mixed to obtain the conditioning solution; S03: The compounding liquid and the adjusted kaolin agent were ball-milled at a weight ratio of (5-8):11, with a ball milling speed of 1500-1700 r / min for 2 hours. After ball milling, the mixture was filtered and dried to obtain modified graphene.

[0019] In this embodiment, the sodium dodecylbenzenesulfonate solution has a mass fraction of 8-12%; the stirring speed for the stirring adjustment process is 450-550 r / min, and the stirring time is 1 h.

[0020] The mass fraction of the lanthanum chloride solution in this embodiment is 2-5%.

[0021] The preparation method of the calcium sulfate whisker agent in this embodiment is as follows: S11: Preheat calcium sulfate whiskers at 130-140℃ for 1 hour, then immerse them in a sufficient amount of yttrium nitrate solution and stir thoroughly. Then filter and dry to obtain yttrium-doped calcium sulfate whiskers. S12: The yttrium-doped calcium sulfate whiskers and carbon nanotube liquid were ball-milled at a weight ratio of (11-15):5. The ball milling speed was 1000-1500 r / min and the milling time was 2 h. After the ball milling was completed, the mixture was filtered and dried to obtain the calcium sulfate whisker agent.

[0022] The mass fraction of the yttrium nitrate solution in this embodiment is 2-5%.

[0023] The carbon nanotube liquid in this embodiment includes the following raw materials in parts by weight: 2-5 parts carbon nanotubes, 1-3 parts silane coupling agent KH550 and 5-8 parts glass fiber, 2-4 parts nano zeolite powder and 5-8 parts sodium alginate solution with a mass fraction of 5%.

[0024] The modified additive in this embodiment is prepared by mixing nano-titanium dioxide, β-cyclodextrin, silane coupling agent KH560 and 85% ethanol solution in a weight ratio of (3-5):2:1:(5-8) to obtain the modified additive.

[0025] This embodiment describes the application of a high-solids-content graphene zinc waterborne heavy-duty anti-corrosion coating in the heavy-duty anti-corrosion of metal substrates.

[0026] Example 1. This embodiment provides a high-solids-content graphene zinc waterborne heavy-duty anti-corrosion coating, which comprises the following raw materials in parts by weight: 35 parts waterborne epoxy resin, 15 parts modified graphene, 7 parts functional additives, 20 parts deionized water, 3 parts modified additives, and 5 parts nano zinc powder.

[0027] In this embodiment, the epoxy equivalent of the waterborne epoxy resin is 400 g / eq, and the solid content is 50%; the functional additives are 3 parts by weight of defoamer, 2 parts by weight of leveling agent, 1 part by weight of silane coupling agent, and 3 parts by weight of film-forming aid. The defoamer is an organosilicon defoamer; the leveling agent is an acrylate leveling agent; the silane coupling agent is silane coupling agent KH560; and the film-forming aid is dodecyl alcohol ester.

[0028] The method for preparing the modified graphene in this embodiment is as follows: S01: Mix 3 parts of nanocellulose, 2 parts of calcium sulfate whisker agent, 4 parts of sodium dodecylbenzenesulfonate solution and 1 part of silane coupling agent KH550 evenly to obtain a compound solution; S02: Heat-treat kaolin at 135℃ for 5 minutes, then cool it to 55℃ at a rate of 3℃ / min and keep it at that temperature; mix the kept-temperature kaolin and conditioning liquid at a weight ratio of 3:6 and adjust the mixture. After mixing, filter and dry to obtain the adjusted kaolin agent. The preparation method of the conditioning solution is as follows: 2 parts silicon carbide, 3 parts lanthanum chloride solution and 1 part flake alumina are thoroughly mixed to obtain the conditioning solution; S03: The compounding liquid and the adjusted kaolin agent were ball-milled at a weight ratio of 5:11 at a speed of 1500 r / min for 2 hours. After the ball milling was completed, the mixture was filtered and dried to obtain modified graphene.

[0029] In this embodiment, the sodium dodecylbenzenesulfonate solution has a mass fraction of 8%; the stirring speed for the stirring adjustment process is 450 r / min, and the stirring time is 1 h.

[0030] The lanthanum chloride solution in this embodiment has a mass fraction of 2%.

[0031] The preparation method of the calcium sulfate whisker agent in this embodiment is as follows: S11: Preheat calcium sulfate whiskers at 130°C for 1 hour, then immerse them in a sufficient amount of yttrium nitrate solution and stir thoroughly. Then filter and dry to obtain yttrium-doped calcium sulfate whiskers. S12: Yttrium-doped calcium sulfate whiskers and carbon nanotube liquid were ball-milled at a weight ratio of 11:5 for 2 hours at a speed of 1000 r / min. After ball milling, the mixture was filtered and dried to obtain calcium sulfate whisker agent.

[0032] The mass fraction of the yttrium nitrate solution in this embodiment is 2%.

[0033] The carbon nanotube liquid in this embodiment includes the following raw materials in parts by weight: 2 parts carbon nanotubes, 1 part silane coupling agent KH550 and 5 parts glass fiber, 2 parts nano zeolite powder and 5 parts sodium alginate solution with a mass fraction of 5%.

[0034] The modified additive in this embodiment is prepared by mixing nano-titanium dioxide, β-cyclodextrin, silane coupling agent KH560, and 85% ethanol solution in a weight ratio of 3:2:1:5 to obtain the modified additive.

[0035] This embodiment describes the application of a high-solids-content graphene zinc waterborne heavy-duty anti-corrosion coating in the heavy-duty anti-corrosion of metal substrates.

[0036] Example 2. This embodiment provides a high-solids-content graphene zinc waterborne heavy-duty anti-corrosion coating, which comprises the following raw materials in parts by weight: 40 parts waterborne epoxy resin, 20 parts modified graphene, 11 parts functional additives, 25 parts deionized water, 5 parts modified additives, and 8 parts nano zinc powder.

[0037] In this embodiment, the epoxy equivalent of the waterborne epoxy resin is 600 g / eq, and the solid content is 70%; the functional additives are 5 parts by weight of defoamer, 4 parts by weight of leveling agent, 3 parts by weight of silane coupling agent, and 5 parts by weight of film-forming aid. The defoamer is an organosilicon defoamer; the leveling agent is an acrylate leveling agent; the silane coupling agent is silane coupling agent KH560; and the film-forming aid is dodecyl alcohol ester.

[0038] The method for preparing the modified graphene in this embodiment is as follows: S01: Mix 5 parts of nanocellulose, 4 parts of calcium sulfate whisker agent, 7 parts of sodium dodecylbenzenesulfonate solution and 2 parts of silane coupling agent KH550 evenly to obtain a compound solution; S02: Heat-treat kaolin at 145℃ for 5-10 min, then cool it to 55℃ at a rate of 5℃ / min and keep it at that temperature; mix the kept-temperature kaolin and conditioning liquid at a weight ratio of 3:9 and adjust the mixture. After mixing, filter and dry to obtain the adjusted kaolin agent. The preparation method of the conditioning solution is as follows: 5 parts silicon carbide, 5 parts lanthanum chloride solution and 2 parts flake alumina are thoroughly mixed to obtain the conditioning solution; S03: The compounding solution and the adjusted kaolin agent were ball-milled at a weight ratio of 8:11 at a speed of 1700 r / min for 2 hours. After the ball milling was completed, the mixture was filtered and dried to obtain modified graphene.

[0039] In this embodiment, the sodium dodecylbenzenesulfonate solution has a mass fraction of 12%; the stirring speed for the stirring adjustment process is 550 r / min, and the stirring time is 1 h.

[0040] The lanthanum chloride solution in this embodiment has a mass fraction of 5%.

[0041] The preparation method of the calcium sulfate whisker agent in this embodiment is as follows: S11: Preheat calcium sulfate whiskers at 140°C for 1 hour, then immerse them in a sufficient amount of yttrium nitrate solution and stir thoroughly. Then filter and dry to obtain yttrium-doped calcium sulfate whiskers. S12: Yttrium-doped calcium sulfate whiskers and carbon nanotube liquid were ball-milled at a weight ratio of 15:5 for 2 hours at a speed of 1500 r / min. After ball milling, the mixture was filtered and dried to obtain calcium sulfate whisker agent.

[0042] The yttrium nitrate solution in this embodiment has a mass fraction of 5%.

[0043] The carbon nanotube liquid in this embodiment includes the following raw materials in parts by weight: 5 parts carbon nanotubes, 3 parts silane coupling agent KH550 and 8 parts glass fiber, 4 parts nano zeolite powder and 8 parts sodium alginate solution with a mass fraction of 5%.

[0044] The modified additive in this embodiment is prepared by mixing nano-titanium dioxide, β-cyclodextrin, silane coupling agent KH560, and 85% ethanol solution in a weight ratio of 5:2:1:8 to obtain the modified additive.

[0045] This embodiment describes the application of a high-solids-content graphene zinc waterborne heavy-duty anti-corrosion coating in the heavy-duty anti-corrosion of metal substrates.

[0046] Example 3. This embodiment provides a high-solids-content graphene zinc waterborne heavy-duty anti-corrosion coating, which comprises the following raw materials in parts by weight: 37.5 parts waterborne epoxy resin, 17.5 parts modified graphene, 9 parts functional additives, 22.5 parts deionized water, 4 parts modified additives, and 6.5 parts nano zinc powder.

[0047] In this embodiment, the epoxy equivalent of the waterborne epoxy resin is 500 g / eq, and the solid content is 60%; the functional additives are 4 parts by weight of defoamer, 3 parts by weight of leveling agent, 2 parts by weight of silane coupling agent, and 4 parts by weight of film-forming aid. The defoamer is an organosilicon defoamer; the leveling agent is an acrylate leveling agent; the silane coupling agent is silane coupling agent KH560; and the film-forming aid is dodecyl alcohol ester.

[0048] The method for preparing the modified graphene in this embodiment is as follows: S01: Mix 4 parts of nanocellulose, 3 parts of calcium sulfate whisker agent, 5.5 parts of sodium dodecylbenzenesulfonate solution and 1.5 parts of silane coupling agent KH550 evenly to obtain a compound solution; S02: Kaolin is heat-treated at 140℃ for 7.5 min, and then cooled to 55℃ at a rate of 4℃ / min and kept at that temperature; the kept-temperature kaolin and conditioning liquid are stirred and conditioned at a weight ratio of 3:7.5. After stirring, the mixture is filtered and dried to obtain the conditioned kaolin agent. The conditioning solution is prepared by mixing 3.5 parts silicon carbide, 4 parts lanthanum chloride solution and 1.5 parts flake alumina thoroughly to obtain the conditioning solution; S03: The compounding solution and the adjusted kaolin agent were ball-milled at a weight ratio of 6.5:11 at a speed of 1600 r / min for 2 hours. After ball milling, the mixture was filtered and dried to obtain modified graphene.

[0049] In this embodiment, the sodium dodecylbenzenesulfonate solution has a mass fraction of 10%; the stirring speed for the stirring adjustment process is 500 r / min, and the stirring time is 1 h.

[0050] The lanthanum chloride solution in this embodiment has a mass fraction of 3.5%.

[0051] The preparation method of the calcium sulfate whisker agent in this embodiment is as follows: S11: Preheat calcium sulfate whiskers at 135°C for 1 hour, then immerse them in a sufficient amount of yttrium nitrate solution and stir thoroughly. Then filter and dry to obtain yttrium-doped calcium sulfate whiskers. S12: Yttrium-doped calcium sulfate whiskers and carbon nanotube liquid were ball-milled at a weight ratio of 13:5 for 2 hours at a speed of 1200 r / min. After ball milling, the mixture was filtered and dried to obtain calcium sulfate whisker agent.

[0052] The mass fraction of the yttrium nitrate solution in this embodiment is 3.5%.

[0053] The carbon nanotube liquid in this embodiment includes the following raw materials in parts by weight: 3.5 parts carbon nanotubes, 2 parts silane coupling agent KH550 and 6.5 parts glass fiber, 3 parts nano zeolite powder and 6.5 parts sodium alginate solution with a mass fraction of 5%.

[0054] The modified additive in this embodiment is prepared by mixing nano-titanium dioxide, β-cyclodextrin, silane coupling agent KH560, and an 85% ethanol solution in a weight ratio of 4:2:1:6.5 to obtain the modified additive.

[0055] This embodiment describes the application of a high-solids-content graphene zinc waterborne heavy-duty anti-corrosion coating in the heavy-duty anti-corrosion of metal substrates.

[0056] Comparative Example 1. Unlike Example 3, no modified graphene was added.

[0057] Comparative Example 2. Unlike Example 3, no kaolin agent was added during the preparation of the modified graphene.

[0058] Comparative Example 3. The kaolin agent that was adjusted differently from that in Example 3 did not contain any conditioning liquid.

[0059] Comparative Example 4. Unlike Example 3, silicon carbide and aluminum oxide were not added to the conditioning solution.

[0060] Comparative Example 5. Unlike Example 3, no calcium sulfate whisker agent was added during the preparation of the modified graphene.

[0061] Comparative Example 6. Unlike Example 3, the calcium sulfate whisker agent was not treated with carbon nanotube liquid.

[0062] Comparative Example 7. Unlike Example 3, no modified additives were added.

[0063] Examples 1-3 and Comparative Examples 1-7 underwent routine performance tests on adhesion and impact, and were placed under a 2% sodium hydroxide alkaline mist for 24 hours, while simultaneously being subjected to UV light at an intensity of 500 W / cm². 2 After 24 hours of irradiation, the corrosion resistance and UV stability of the products were tested. The test results are as follows.

[0064] Examples 1-3 and Comparative Examples 1-7 show that the product of the present invention can achieve a coordinated improvement in adhesion and impact resistance, while the product has significant effects in corrosion resistance and UV stability. The product does not contain modified graphene, the modified graphene preparation does not include a regulating kaolin agent, the regulating kaolin agent does not include a regulating liquid, the regulating liquid does not contain silicon carbide and alumina, the modified graphene preparation does not include calcium sulfate whisker agent, the calcium sulfate whisker agent is not treated with carbon nanotube liquid, and no modifying additives are added. The performance of the product tends to deteriorate to varying degrees. Only the modified graphene obtained by the method of this invention, combined with the modifying additives of this invention, has the most significant performance effect. Furthermore, the preparation of calcium sulfate whisker agent is unique, and the technical effect of the solution of this invention is the most significant.

[0065] 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.

[0066] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A high-solids-content graphene zinc water-based heavy-duty anti-corrosion coating, characterized in that, The anti-corrosion coating comprises the following raw materials in parts by weight: 35-40 parts of waterborne epoxy resin, 15-20 parts of modified graphene, 7-11 parts of functional additives, 20-25 parts of deionized water, 3-5 parts of modified additives, and 5-8 parts of nano zinc powder.

2. The high-solids-content graphene zinc water-based heavy-duty anti-corrosion coating according to claim 1, characterized in that, The waterborne epoxy resin has an epoxy equivalent of 400-600 g / eq and a solid content of 50-70%; the functional additives are 3-5 parts by weight of defoamer, 2-4 parts by weight of leveling agent, 1-3 parts by weight of silane coupling agent, and 3-5 parts by weight of film-forming aid. The defoamer is an organosilicon defoamer; the leveling agent is an acrylate leveling agent; the silane coupling agent is silane coupling agent KH560; and the film-forming aid is dodecyl alcohol ester.

3. The high-solids-content graphene zinc water-based heavy-duty anti-corrosion coating according to claim 1, characterized in that, The method for preparing the modified graphene is as follows: S01: Mix 3-5 parts of nanocellulose, 2-4 parts of calcium sulfate whisker agent, 4-7 parts of sodium dodecylbenzenesulfonate solution and 1-2 parts of silane coupling agent KH550 evenly to obtain a compound solution; S02: Heat-treat kaolin at 135-145℃ for 5-10 minutes, then cool it to 55℃ at a rate of 3-5℃ / min and hold it at that temperature; The heat-insulating kaolin and conditioning liquid are mixed and adjusted at a weight ratio of 3:(6-9). After mixing, the mixture is filtered and dried to obtain the adjusted kaolin agent. The preparation method of the conditioning solution is as follows: 2-5 parts silicon carbide, 3-5 parts lanthanum chloride solution and 1-2 parts flake alumina are thoroughly mixed to obtain the conditioning solution; S03: The compounding liquid and the adjusted kaolin agent were ball-milled at a weight ratio of (5-8):11, with a ball milling speed of 1500-1700 r / min for 2 hours. After ball milling, the mixture was filtered and dried to obtain modified graphene.

4. The high-solids-content graphene zinc water-based heavy-duty anti-corrosion coating according to claim 3, characterized in that, The sodium dodecylbenzenesulfonate solution has a mass fraction of 8-12%; the stirring speed for the stirring adjustment process is 450-550 r / min, and the stirring time is 1 h.

5. The high-solids-content graphene zinc water-based heavy-duty anti-corrosion coating according to claim 3, characterized in that, The lanthanum chloride solution has a mass fraction of 2-5%.

6. The high-solids-content graphene zinc water-based heavy-duty anti-corrosion coating according to claim 3, characterized in that, The preparation method of the calcium sulfate whisker agent is as follows: S11: Preheat calcium sulfate whiskers at 130-140℃ for 1 hour, then immerse them in a sufficient amount of yttrium nitrate solution and stir thoroughly. Then filter and dry to obtain yttrium-doped calcium sulfate whiskers. S12: The yttrium-doped calcium sulfate whiskers and carbon nanotube liquid were ball-milled at a weight ratio of (11-15):

5. The ball milling speed was 1000-1500 r / min and the milling time was 2 h. After the ball milling was completed, the mixture was filtered and dried to obtain the calcium sulfate whisker agent.

7. The high-solids-content graphene zinc water-based heavy-duty anti-corrosion coating according to claim 6, characterized in that, The mass fraction of the yttrium nitrate solution is 2-5%.

8. The high-solids-content graphene zinc water-based heavy-duty anti-corrosion coating according to claim 6, characterized in that, The carbon nanotube liquid comprises the following raw materials in parts by weight: 2-5 parts carbon nanotubes, 1-3 parts silane coupling agent KH550 and 5-8 parts glass fiber, 2-4 parts nano zeolite powder and 5-8 parts sodium alginate solution with a mass fraction of 5%.

9. The high-solids-content graphene zinc water-based heavy-duty anti-corrosion coating according to claim 1, characterized in that, The modified additive is prepared by mixing nano-titanium dioxide, β-cyclodextrin, silane coupling agent KH560 and 85% ethanol solution in a weight ratio of (3-5):2:1:(5-8) to obtain the modified additive.

10. The application of a high-solids-content graphene zinc waterborne heavy-duty anti-corrosion coating as described in any one of claims 1-9 in heavy-duty anti-corrosion of metal substrates.

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