Single-component acrylic acid asphalt rusty coating anticorrosive paint

Abstract

The invention relates to a single-component acrylic acid asphalt anti-corrosion coating for rusty coating. The coating comprises the following components in parts by mass: 6-10 parts of water, 1-2 parts of a dispersing agent, 0.2-0.3 part of a pH regulator, 0.4-0.6 part of a defoaming agent, 5-7 parts of aluminum triphosphate, 4-5 parts of iron oxide black, 45-55 parts of an acrylic emulsion, 12-16 parts of asphalt, 2.5-3 parts of a coalescing agent, 0.4-0.6 part of an anti-flash-rust aid, 0.8-1.2 parts of a flatting agent, 0.8-1.2 parts of an anti-rust aid, 12-16 parts of graphene oxide composite microspheres and 2-10 parts of a silicon dioxide compound. The anticorrosive paint has the effects of improving the corrosion resistance and long-acting corrosion resistance of the anticorrosive paint.

Description

Technical Field

[0001] This application relates to the field of anti-corrosion coatings, and more particularly to a single-component acrylic bitumen anti-corrosion coating for rust-resistant coating. Background Technology

[0002] Rust-resistant coating technology is an important branch of the anti-corrosion coating field. It can be applied directly to steel surfaces that have not been completely rusted, significantly reducing surface treatment costs and demonstrating substantial economic value. In recent years, driven by demands from industries such as infrastructure, marine engineering, and vehicle manufacturing, this technology has rapidly developed towards environmental friendliness and high performance. Domestic and international markets continue to see rising demand for water-based, low-VOC, and solvent-free products. Especially against the backdrop of "dual carbon" targets and stricter environmental regulations, traditional high-VOC solvent-based coatings are facing pressure to transform and upgrade.

[0003] Currently, there is still a gap between domestic and international technological development. The international market has launched high-performance, environmentally friendly products with salt spray resistance exceeding 5000 hours and continues to innovate in terms of sustainability and long-term protection. In contrast, while domestic technology has progressed rapidly under policy support, high-end products still generally suffer from performance deficiencies. Many environmentally friendly rust-resistant coatings struggle to simultaneously achieve rust penetration stability and long-term corrosion protection. Therefore, developing a water-based rust-resistant coating that meets environmental requirements while possessing excellent rust penetration stability, strong adhesion, and long-term corrosion protection is of great significance. Summary of the Invention

[0004] To further improve the corrosion resistance and adhesion of anti-corrosion coatings, this application provides a single-component acrylic asphalt anti-corrosion coating for rust-resistant applications.

[0005] This application provides a single-component acrylic asphalt anti-corrosion coating for rust-resistant applications, employing the following technical solution: A single-component acrylic asphalt rust-resistant anti-corrosion coating comprises the following components in parts by weight: 6-10 parts water, 1-2 parts dispersant, 0.2-0.3 parts pH adjuster, 0.4-0.6 parts defoamer, 5-7 parts aluminum tripolyphosphate, 4-5 parts iron oxide black, 45-55 parts acrylic emulsion, 12-16 parts asphalt, 2.5-3 parts film-forming aid, 0.4-0.6 parts anti-flash rust aid, 0.8-1.2 parts leveling agent, 0.8-1.2 parts rust-inhibiting aid, 1-3 parts rust converter, 12-16 parts graphene oxide composite microspheres, and 2-10 parts silica composite.

[0006] By adopting the above technical solutions, the corrosion resistance and stability of the coating system are improved through the bonding of the functional groups of acrylic resin with metals, the passivation reaction of phosphate converters, the interpenetrating network structure formed by asphalt and resin, and the stabilizing effect of aluminum tripolyphosphate on the rust layer. At the same time, graphene oxide composite microspheres and silica composites are introduced to synergistically construct a dual-strength protective network of physical barrier and chemical slow release, filling the shortcoming of the long-term anti-corrosion performance of the basic components and further improving the corrosion resistance and service life of the coating.

[0007] Preferably, the graphene oxide composite microspheres comprise 2-aminophenylthiazolium and modified graphene oxide.

[0008] By adopting the above technical solution, using modified graphene oxide as a carrier to load corrosion inhibitors, the phenomenon of early consumption or loss caused by direct addition of corrosion inhibitors is reduced, providing continuous and stable corrosion inhibition capability for the coating, and further improving the corrosion resistance and stability of the anti-corrosion coating.

[0009] Preferably, the modified graphene oxide is prepared by the following method: Graphene oxide was mixed with ethanol, then adenosine was added, the mixture was heated and reacted, and then centrifuged and washed to obtain adenosine-based graphene oxide. The adenosine-based graphene oxide was mixed with water to obtain adenosine-based graphene oxide dispersion. β-cyclodextrin was added to the adenosine-based graphene oxide dispersion, the mixture was heated and stirred, and then centrifuged, washed and dried to obtain modified graphene oxide.

[0010] By adopting the above technical solution, adenosine molecules modify the surface of graphene oxide through polar interaction, thereby improving its compatibility with components such as aqueous acrylic emulsion and water, and improving the dispersion uniformity of graphene oxide in aqueous systems. The cavity structure of β-cyclodextrin can load anti-rust active substances, providing a carrier for subsequent composite slow-release agents. At the same time, its hydrophilic and hydrophobic properties enhance the interfacial bonding force between modified graphene oxide and the organic and inorganic phases of the coating.

[0011] Preferably, the mass ratio of adenosine, graphene oxide and β-cyclodextrin is 1.1:1:(2.8-3.2).

[0012] By adopting the above technical solution, the mass ratio of adenosine, graphene oxide and β-cyclodextrin is preferably within the above range, the surface of graphene oxide is fully modified, thereby uniformly dispersed in the coating system, and the active loading sites of graphene oxide are fully activated, further improving the loading rate of the modified graphene oxide for the subsequent slow-release agent.

[0013] Preferably, the graphene oxide composite microspheres are prepared by the following method: Modified graphene oxide was mixed with deionized water to obtain a modified graphene oxide dispersion. 2-Aminophenylthiazolium was mixed with acetone and then added to the modified graphene oxide dispersion. The mixture was treated under vacuum, then centrifuged and washed, and finally dried to obtain graphene oxide composite microspheres.

[0014] By adopting the above technical solution, 2-aminophenylthiazolium is fully adsorbed onto the β-cyclodextrin cavity and surface of modified graphene oxide under vacuum conditions. The resulting graphene oxide composite microspheres continuously release the slow-release agent, which works synergistically with the slow-release agent released by asphalt to extend the anti-corrosion time of the coating.

[0015] Preferably, the mass ratio of the modified graphene oxide to 2-aminophenylprophiazole is 1:(0.3-0.4).

[0016] By adopting the above technical solution, the mass ratio between modified graphene oxide and 2-aminophenylprophiazole is preferably within the above range, so that 2-aminophenylprophiazole can fully fill the loading sites of modified graphene oxide. The loaded microspheres are uniformly distributed in the coating system and can synergistically construct a protective network with the silica composite, further improving the corrosion resistance of the coating system.

[0017] Preferably, the silica composite comprises nano-silica, dopamine hydrochloride, and hexadecyltrimethylammonium chloride.

[0018] By adopting the above technical solution, nano-silica has a high specific surface area and good physical barrier properties, which can fill the tiny pores after the coating film is formed. It complements the sheet barrier of graphene oxide composite microspheres, further improving the corrosion resistance. Dopamine hydrochloride enhances its compatibility and interfacial bonding with water-based acrylic emulsions and graphene oxide composite microspheres. Hexadecyltrimethylammonium chloride further regulates the hydrophilicity and hydrophobicity of the nano-silica surface, enhances its dispersion stability in the coating system, and thus improves the overall corrosion resistance of the system.

[0019] Preferably, the silica composite is prepared by the following method: Dopamine hydrochloride and triethanolamine were mixed with water and dispersed. Hexadecyltrimethylammonium chloride was added, and the mixture was heated and stirred. Tetraethyl orthosilicate was added, and the mixture was centrifuged after reaction. Excess hexadecyltrimethylammonium chloride was removed by washing to obtain a preform. The preform was dispersed in ethanol, and then 3-aminopropyltriethoxysilane was added and stirred to react. After washing and drying, a silica complex was obtained.

[0020] By adopting the above technical solution, tetraethyl orthosilicate is hydrolyzed to generate nano-silica, which forms a composite preform with dopamine hydrochloride and hexadecyltrimethylammonium chloride. 3-Aminopropyltriethoxysilane is used as a coupling agent to further improve the compatibility of the composite with organic components such as acrylic emulsion, enhance the density and impact resistance of the coating, and enable it to synergistically construct a dense protective network with graphene oxide composite microspheres, significantly improving the coating's impermeability and long-term anti-corrosion performance.

[0021] Preferably, the mass ratio of dopamine hydrochloride, hexadecyltrimethylammonium chloride and tetraethyl orthosilicate is 1.7:(2.4-2.8):1.

[0022] By adopting the above technical solution, and preferably within the above range the mass ratio of dopamine hydrochloride, hexadecyltrimethylammonium chloride and tetraethyl orthosilicate, the surface of nano-silica is fully modified, which improves its dispersion stability in the coating. Moreover, the prepared nano-silica has a uniform and stable particle size, effectively fills the voids in the coating, and synergistically improves the overall corrosion resistance of the coating with graphene oxide.

[0023] Preferably, the mass ratio between the graphene oxide composite microspheres and the silica composite is 1:(0.4-0.6).

[0024] By adopting the above technical solution, the preferred mass ratio between graphene oxide composite microspheres and silica composite is within the above range. The sheet-like barrier and chemical slow release of the graphene oxide composite microspheres complement and enhance the pore-filling and dense protection functions of the silica composite, constructing a continuous and dense multi-layer protection network. This network works synergistically with the rust transformation, corrosion inhibition, and physical encapsulation effects of the basic components to maximize the coating's barrier ability against corrosive media such as water and oxygen, while extending the slow-release period of the anti-rust components.

[0025] In summary, this application includes at least one of the following beneficial technical effects: Based on a water-based acrylic asphalt system, a specific number of graphene oxide composite microspheres and silica composites were synergistically introduced to construct a dual long-lasting protective network that combines sheet-like physical barrier and chemical slow release, which significantly improved the overall corrosion resistance and service life of the coating. By modifying graphene oxide in two steps with adenosine-β-cyclodextrin and combining it with a corrosion inhibitor, structurally stable graphene oxide composite microspheres were prepared. This not only improved the dispersion problem of graphene oxide in aqueous systems, but also enhanced the molecular-level immobilization and release effect of the corrosion inhibitor, reduced the early loss of corrosion-resistant active ingredients, and provided the coating with long-lasting anti-corrosion capability. By combining silica composites with strong interfacial adhesion with supported graphene oxide composite microspheres at a specific mass ratio, the advantages of spatial and functional complementarity are achieved, further enhancing the stability and corrosion resistance of the prepared coating system. Detailed Implementation

[0026] The present application will be further described in detail below with reference to the embodiments: Raw material description: All raw materials in the examples are commercially available; the dispersant is polycarboxylate polymeric dispersant BYK-190, the pH adjuster is N,N-dimethylethanolamine (CAS No.: 108-01-0), the defoamer is BYK-024, the carbon black pigment is high-pigment carbon black of model DL430, the film-forming aid is dodecyl alcohol ester (CAS No.: 25265-77-4), the anti-flash rust additive is Hemings H10, the leveling agent is RM2020, the rust inhibitor is benzotriazole (CAS No.: 95-14-7), and the rust conversion agent is Ascotrust x4. Example 1

[0027] Preparation of modified graphene oxide: 8.98 g of graphene oxide was mixed with 200 g of ethanol and ultrasonically stirred for 30 min. Then, 8.16 g of adenosine (CAS No.: 58-61-7) powder was added, the mixture was heated to 60 °C, refluxed for 24 h, then cooled to 25 °C, and centrifuged at 8000 rpm. The mixture was repeatedly washed with ethanol and dried in a vacuum oven at 50 °C for 12 h to obtain adenosine-composite graphene oxide. The adenosine-composite graphene oxide was then mixed with 300 g of... After mixing with deionized water and sonicating for 20 min, the pH was adjusted to 9 with ammonia to obtain an adenosine-based graphene oxide dispersion. 22.86 g of β-cyclodextrin (CAS No.: 7585-39-9) was added to the adenosine-based graphene oxide dispersion, the temperature was raised to 75 °C and the mixture was stirred for 4 h. Then, the mixture was centrifuged at 10,000 rpm and washed with deionized water. Finally, the mixture was dried in a vacuum oven at 60 °C for 24 h to obtain modified graphene oxide.

[0028] Preparation of graphene oxide composite microspheres: 15.38 g of modified graphene oxide was mixed with 200 g of deionized water and ultrasonically dispersed for 20 min to obtain a modified graphene oxide dispersion. 4.62 g of 2-aminophenylprophiazole (CAS No.: 136-95-8) was mixed with 80 g of acetone and added to the modified graphene oxide dispersion. The mixture was vacuum treated for 5 h, then washed with deionized water at 10,000 rpm and dried in a vacuum drying oven at 50 °C for 24 h to obtain graphene oxide composite microspheres.

[0029] Preparation of silica composites: 16.67 g of dopamine hydrochloride (CAS No.: 62-31-7), 30 g of triethanolamine (CAS No.: 102-71-6), and 20 g of deionized water were mixed and ultrasonically dispersed for 15 min. Then, 23.53 g of hexadecyltrimethylammonium chloride (CAS No.: 112-02-7) was added, the mixture was heated to 70 °C, and stirred for 1 h. Then, 9.8 g of tetraethyl orthosilicate (CAS No.: 78-10-4) was added, and the reaction was carried out for 12 h. The sample particles were collected by centrifugation at 11,000 rpm and then dispersed in a mixture of 10 mol / L hydrochloric acid and anhydrous ethanol. Excess hexadecyltrimethylammonium chloride was removed by extraction at 25 °C. Ammonium chloride was washed three times with 50% ethanol solution and then freeze-dried under vacuum at -20°C for 8 hours to obtain a preform. The preform was mixed with 300g of anhydrous ethanol and ultrasonically dispersed for 15 minutes. Then, it was heated to 70°C and stirred at 600 rpm for 30 minutes. 0.05g of 3-aminopropyltriethoxysilane (CAS No.: 919-30-2) was added, and the reaction was continued for 12 hours. After the reaction, unreacted 3-aminopropyltriethoxysilane and byproducts were removed by washing with anhydrous ethanol. The particles were collected by centrifugation and dried in a vacuum drying oven at 60°C for 2 hours to obtain a silica complex.

[0030] Preparation of one-component acrylic asphalt anti-corrosion coating for rust-resistant applications: Add 6g of deionized water to the reactor, then add 1g of dispersant and 0.2g of pH adjuster, and stir at 300rpm for 5min. Add 5g of aluminum tripolyphosphate and 4g of iron oxide black, and disperse at 800rpm for 30min. Add 0.4g of defoamer and stir at 300rpm for 10min. Add 45g of acrylic emulsion and 12g of asphalt, and stir at 500rpm for 20min. Add 2.5g of film-forming aid, 0.4g of anti-flash rust aid, 0.8g of leveling agent, 0.8g of rust inhibitor, and 1g of rust converter, and stir at 500rpm for 20min. Finally, add 12g of graphene oxide composite microspheres and 2g of silica composite, and stir at 1000rpm for 25min to obtain a single-component acrylic asphalt rust-resistant anti-corrosion coating. Example 2

[0031] Preparation of modified graphene oxide: 8.3 g of graphene oxide was mixed with 200 g of ethanol and ultrasonically stirred for 30 min. Then, 7.55 g of adenosine powder was added, the mixture was heated to 60 °C, refluxed for 24 h, cooled to 25 °C, and centrifuged at 8000 rpm. The mixture was repeatedly washed with ethanol and dried in a vacuum oven at 50 °C for 12 h to obtain adenosine-based graphene oxide. The adenosine-based graphene oxide was mixed with 300 g of deionized water and ultrasonicated for 20 min. The pH was adjusted to 10 with ammonia to obtain an adenosine-based graphene oxide dispersion. 24.15 g of β-cyclodextrin was added to the adenosine-based graphene oxide dispersion, the mixture was heated to 75 °C and stirred for 4 h, centrifuged at 10000 rpm, washed with deionized water, and dried in a vacuum oven at 60 °C for 24 h to obtain modified graphene oxide.

[0032] Preparation of graphene oxide composite microspheres: 14.29 g of modified graphene oxide was mixed with 200 g of deionized water and ultrasonically dispersed for 20 min to obtain a modified graphene oxide dispersion. 5.71 g of 2-aminophenylthiazolium was mixed with 80 g of acetone and added to the modified graphene oxide dispersion. The mixture was vacuum treated for 5 h, then washed with deionized water at 10,000 rpm and dried in a vacuum drying oven at 50 °C for 24 h to obtain graphene oxide composite microspheres.

[0033] Preparation of silica composites: 15.46 g of dopamine hydrochloride, 30 g of triethanolamine, and 20 g of deionized water were mixed and ultrasonically dispersed for 15 min. Then, 25.45 g of hexadecyltrimethylammonium chloride was added, the mixture was heated to 70 °C, and stirred for 1 h. Next, 9.09 g of tetraethyl orthosilicate was added, and the reaction was allowed to proceed for 12 h. The sample particles were collected by centrifugation at 11000 rpm and then dispersed in a mixture of 10 mol / L hydrochloric acid and anhydrous ethanol. Excess hexadecyltrimethylammonium chloride was removed by extraction at 25 °C using 50% ethanol solution. The mixture was washed three times with liquid and then freeze-dried under vacuum at -20°C for 8 hours to obtain a preform. The preform was mixed with 300g of anhydrous ethanol and ultrasonically dispersed for 15 minutes. Then, it was heated to 70°C and stirred at 600 rpm for 30 minutes. 0.05g of 3-aminopropyltriethoxysilane was added, and the reaction was continued for 12 hours. After the reaction, the unreacted 3-aminopropyltriethoxysilane and byproducts were removed by washing with anhydrous ethanol. The particles were collected by centrifugation and dried in a vacuum drying oven at 60°C for 2 hours to obtain a silica composite.

[0034] Preparation of one-component acrylic asphalt anti-corrosion coating for rust-resistant applications: Add 10g of deionized water to the reactor, then add 2g of dispersant and 0.3g of pH adjuster, and stir at 300rpm for 5min. Add 7g of aluminum tripolyphosphate and 5g of iron oxide black, and disperse at 800rpm for 30min. Add 0.6g of defoamer and stir at 300rpm for 10min. Add 55g of acrylic emulsion and 16g of asphalt, and stir at 500rpm for 20min. Add 3g of film-forming aid, 0.6g of anti-flash rust aid, 1.2g of leveling agent, 1.2g of rust inhibitor, and 3g of rust converter, and stir at 500rpm for 20min. Finally, add 16g of graphene oxide composite microspheres and 10g of silica composite, and stir at 1000rpm for 25min to obtain a single-component acrylic asphalt rust-resistant anti-corrosion coating. Example 3

[0035] Preparation of modified graphene oxide: 8.63 g of graphene oxide was mixed with 200 g of ethanol and ultrasonically stirred for 30 min. Then, 7.84 g of adenosine powder was added, the mixture was heated to 60 °C, refluxed for 24 h, cooled to 25 °C, and centrifuged at 8000 rpm. The mixture was repeatedly washed with ethanol and dried in a vacuum oven at 50 °C for 12 h to obtain adenosine-based graphene oxide. The adenosine-based graphene oxide was mixed with 300 g of deionized water and ultrasonicated for 20 min. The pH was adjusted to 9.5 with ammonia to obtain an adenosine-based graphene oxide dispersion. 23.53 g of β-cyclodextrin was added to the adenosine-based graphene oxide dispersion, the mixture was heated to 75 °C and stirred for 4 h, centrifuged at 10000 rpm, washed with deionized water, and dried in a vacuum oven at 60 °C for 24 h to obtain modified graphene oxide.

[0036] Preparation of graphene oxide composite microspheres: 14.81 g of modified graphene oxide was mixed with 200 g of deionized water and ultrasonically dispersed for 20 min to obtain a modified graphene oxide dispersion. 5.19 g of 2-aminophenylthiazolium was mixed with 80 g of acetone and added to the modified graphene oxide dispersion. The mixture was vacuum treated for 5 h, then washed with deionized water at 10,000 rpm and dried in a vacuum drying oven at 50 °C for 24 h to obtain graphene oxide composite microspheres.

[0037] Preparation of silica composites: 14.04 g of dopamine hydrochloride, 30 g of triethanolamine, and 20 g of deionized water were mixed and ultrasonically dispersed for 15 min. Then, 24.53 g of hexadecyltrimethylammonium chloride was added, the mixture was heated to 70 °C, and stirred for 1 h. Next, 9.43 g of tetraethyl orthosilicate was added, and the reaction was allowed to proceed for 12 h. The sample particles were collected by centrifugation at 11000 rpm and then dispersed in a mixture of 10 mol / L hydrochloric acid and anhydrous ethanol. Excess hexadecyltrimethylammonium chloride was removed by extraction at 25 °C using 50% ethanol solution. The mixture was washed three times with liquid and then freeze-dried under vacuum at -20°C for 8 hours to obtain a preform. The preform was mixed with 300g of anhydrous ethanol and ultrasonically dispersed for 15 minutes. Then, it was heated to 70°C and stirred at 600 rpm for 30 minutes. 0.05g of 3-aminopropyltriethoxysilane was added, and the reaction was continued for 12 hours. After the reaction, the unreacted 3-aminopropyltriethoxysilane and byproducts were removed by washing with anhydrous ethanol. The particles were collected by centrifugation and dried in a vacuum drying oven at 60°C for 2 hours to obtain a silica composite.

[0038] Preparation of one-component acrylic asphalt anti-corrosion coating for rust-resistant applications: Add 8g of deionized water to the reactor, then add 1.5g of dispersant and 0.25g of pH adjuster, and stir at 300rpm for 5min. Then add 6g of aluminum tripolyphosphate and 4.5g of iron oxide black, and disperse at 800rpm for 30min. Next, add 0.5g of defoamer and stir at 300rpm for 10min. Then add 50g of acrylic emulsion and 14g of asphalt, and stir at 500rpm for 20min. Then add 2.75g of film-forming aid, 0.5g of anti-flash rust aid, 1g of leveling agent, 1g of rust inhibitor, and 2g of rust converter, and stir at 500rpm for 20min. Finally, add 14g of graphene oxide composite microspheres and 7g of silica composite, and stir at 1000rpm for 25min to obtain a single-component acrylic asphalt rust-resistant anti-corrosion coating. Example 4

[0039] Example 4 is based on Example 3. In Example 4, when preparing modified graphene oxide, 9.3g of adenosine, 10.23g of graphene oxide, and 20.47g of β-cyclodextrin were added. Example 5

[0040] Example 5 is based on Example 3. In Example 5, when preparing modified graphene oxide, 6.78g of adenosine, 7.46g of graphene oxide, and 25.76g of β-cyclodextrin were added. Example 6

[0041] Example 6 is based on Example 3, except that no adenosine was added when preparing the modified graphene oxide in Example 6. Example 7

[0042] Example 7 is based on Example 3, except that no β-cyclodextrin was added when preparing the modified graphene oxide in Example 7. Example 8

[0043] Example 8 is based on Example 3. In Example 8, when preparing graphene oxide composite microspheres, 16.67g of modified graphene oxide and 3.33g of 2-aminophenylprophiazole were used. Example 9

[0044] Example 9 is based on Example 3. In Example 9, when preparing graphene oxide composite microspheres, 13.33g of modified graphene oxide and 6.67g of 2-aminophenylprophiazole were used. Example 10

[0045] Example 10 is based on Example 3. In Example 10, when preparing graphene oxide composite microspheres, the modified graphene oxide is replaced with ordinary graphene oxide. Example 11

[0046] Example 11 is based on Example 3. In Example 11, when preparing the silica composite, the amount of dopamine hydrochloride used was 18.48g, the amount of hexadecyltrimethylammonium chloride was 20.65g, and the amount of tetraethyl orthosilicate was 10.87g. Example 12

[0047] Example 12 is based on Example 3. In Example 12, when preparing the silica composite, the amount of dopamine hydrochloride used was 14.41 g, the amount of hexadecyltrimethylammonium chloride was 27.12 g, and the amount of tetraethyl orthosilicate was 8.47 g. Example 13

[0048] Example 13 is based on Example 3, except that dopamine hydrochloride was not used in the preparation of the silica composite in Example 13. Example 14

[0049] Example 14 is based on Example 3, except that hexadecyltrimethylammonium chloride was not used in the preparation of the silica composite in Example 14. Example 15

[0050] Example 15 is based on Example 3. In Example 15, 3-aminopropyltriethoxysilane was not used to treat the preform when preparing the silica composite. Example 16

[0051] Example 16 is based on Example 3. The silica complex added to the single-component acrylic asphalt rust-resistant anti-corrosion coating in Example 16 is 5.6g. Example 17

[0052] Example 17 is based on Example 3. The silica complex added to the single-component acrylic asphalt rust-resistant anti-corrosion coating in Example 17 is 8.4g.

[0053] Comparative Example 1 Comparative Example 1 is based on Example 3, except that the graphene oxide composite component in the single-component acrylic asphalt rust-resistant anti-corrosion coating is replaced with ordinary graphene oxide.

[0054] Comparative Example 2 Comparative Example 2 is based on Example 3, but the silica complex in the single-component acrylic asphalt rust-resistant coating is replaced with ordinary nano silica.

[0055] Comparative Example 3 Comparative Example 3 is based on Example 3, in which the silica compound in the single-component acrylic asphalt rust-resistant coating is replaced with an equal amount of acrylic emulsion.

[0056] Comparative Example 4 Comparative Example 4 is based on Example 3, in which the graphene oxide composite in the single-component acrylic asphalt rust-resistant coating is replaced with an equal amount of acrylic emulsion.

[0057] Performance testing The following performance tests were performed on the samples of Examples 1-17 and Comparative Examples 1-4: (1) Corrosion resistance The corrosion resistance of the samples was tested using GB / T 10125-2021 and GB / T 1763-1989 as testing references. Salt water resistance test: After applying a rust-resistant coating without scratches, immerse it in a 3% NaCl solution at room temperature (21-33℃) and observe the time it takes for the paint film to blister, peel off, rust, etc. Each sample is tested 3 times, and the average value is taken. The test results are recorded in Table 1.

[0058] Salt spray resistance test: The sample preparation is the same as the salt water resistance test. The sample is placed in a salt spray test chamber at a temperature of 35℃ and a salt spray deposition rate of 1-2 mL / (80cm²・h). The time it takes for phenomena such as blistering, peeling, and rusting to appear on the test surface is observed. Each sample is tested 3 times, and the average value is taken. The test results are filled in Table 1.

[0059] (2) Flash rust inhibition Using GB / T 31815-2015 as the testing reference, the flash rust inhibition of the samples was tested. Q235 steel sheets were selected, and the surface roughness Ra was ground to 0.8-1.2μm, leaving a thin rust layer (10-20μm thick). The samples were coated according to the coating application requirements and placed in an environment with a temperature of 25℃ and a relative humidity of ≥95% for 24 hours. The presence of flash rust spots on the paint film surface was recorded and rated, with grade 0 being the best.

[0060] (3) Weather resistance Using GB / T 1865-2009 as the testing reference, the weather resistance of the samples was tested. Each sample was tested 3 times, and the average value was taken. The test results were recorded in Table 1.

[0061] (4) Impact resistance Using GB / T 1732-1993 as the testing reference, the impact resistance of the samples was tested. Each sample was tested 3 times, and the average value was taken. The test results were recorded in Table 1.

[0062] Table 1 Performance test results of Examples 1-17 and Comparative Examples 1-4

[0063] As shown in Table 1, the salt water resistance time of Examples 1-3 is 124 hours or more, the salt spray resistance time is 1100 hours or more, the flash rust inhibition time is 0, the weather resistance is 1100 hours or more, and the impact strength is 55 cm or more. This indicates that the anti-corrosion coating prepared in this application has good corrosion resistance, flash rust inhibition, weather resistance and impact strength.

[0064] In Examples 4 and 5, the mass ratios of adenosine, graphene oxide, and β-cyclodextrin were not within the range specified in this application. When β-cyclodextrin was insufficient, it was difficult to fully coat the graphene oxide and construct a sufficient number of loading sites, resulting in a decrease in the loading rate of the prepared modified graphene oxide, a decrease in the sustained-release performance, and agglomeration of the graphene oxide in the system, leading to a decrease in stability. When β-cyclodextrin was excessive, β-cyclodextrin agglomerated, which reduced the dispersibility of the modified graphene oxide and affected the stability of the coating.

[0065] In Example 6, no adenosine was added when preparing modified graphene oxide. The surface polarity of the graphene oxide was too high, resulting in severe agglomeration and difficulty in uniform dispersion in the coating system, thus reducing its stability.

[0066] In Example 7, no β-cyclodextrin was added when preparing modified graphene oxide. As a result, the modified graphene oxide lacked a loaded cavity, making it difficult to effectively adsorb 2-aminophenylprophiazole. Consequently, it did not have a slow-release rust-preventing effect, and its long-term corrosion resistance decreased.

[0067] In Examples 8 and 9, the mass ratio between modified graphene oxide and 2-aminophenylprophiazole is not within the range specified in this application. When 2-aminophenylprophiazole is insufficient, the rust-preventive components released by the graphene oxide composite microspheres are insufficient, making it difficult to compensate for the consumption of asphalt inhibitor in the base component. When 2-aminophenylprophiazole is excessive, it exceeds the loading capacity of the modified graphene oxide, causing 2-aminophenylprophiazole to precipitate in the coating, which damages the stability of the system and affects the bonding strength between the acrylic resin and the metal surface, resulting in decreased adhesion.

[0068] In Example 10, when preparing graphene oxide composite microspheres, ordinary graphene oxide was used. Ordinary graphene oxide has poor dispersibility, no loading capacity, and poor compatibility with aqueous systems, which affects the overall stability of the system.

[0069] In Examples 11 and 12, the mass ratios of dopamine hydrochloride, hexadecyltrimethylammonium chloride, and tetraethyl orthosilicate are not within the range specified in this application. When hexadecyltrimethylammonium chloride is insufficient, the hydrophilicity and hydrophobicity of the nano-silica are not adequately controlled, resulting in poor dispersion and difficulty in uniformly filling the coating voids. The bonding force between the nano-silica and the graphene oxide composite microspheres is also poor, making it difficult to form a synergistic barrier network. When hexadecyltrimethylammonium chloride is excessive, it affects the adhesion of the system and causes bubbles in the coating.

[0070] In Example 13, when preparing the silica composite, dopamine hydrochloride was not used, resulting in decreased compatibility with the acrylic emulsion and graphene oxide microspheres.

[0071] In Example 14, the preparation of the silica composite did not involve treatment with hexadecyltrimethylammonium chloride, resulting in excessively high surface polarity of the nano-silica, which led to agglomeration in the system.

[0072] In Example 15, the silica composite was not treated with 3-aminopropyltriethoxysilane during preparation, which resulted in a decrease in the interfacial bonding between the silica composite and the acrylic emulsion, and a decrease in stability.

[0073] The performance of Examples 16 and 17 is higher than that of Examples 1 and 2, indicating that the graphene oxide composite microspheres and silica composites have better corrosion resistance, flash rust inhibition, weather resistance and impact strength within the ratio range specified in this application.

[0074] In Comparative Example 1, the graphene oxide composite component in the coating system was replaced with ordinary graphene oxide. Ordinary graphene oxide sheets had poor dispersibility in the system, severe agglomeration, and no slow-release agent loading, resulting in a decline in all performance aspects.

[0075] In Comparative Example 2, the silica composite in the coating system was replaced with ordinary nano silica. Lacking the strong interfacial adhesion provided by polydopamine, it was difficult to penetrate and fix the rust layer, resulting in decreased stability.

[0076] In Comparative Example 3, no silica composite was added to the coating system. The coating's flexibility increased, but its hardness decreased, making it easier for corrosive media to penetrate.

[0077] In Comparative Example 4, the coating system did not contain graphene oxide composite, resulting in a significant decrease in long-term corrosion resistance.

[0078] This specific embodiment is merely an explanation of this application and is not intended to limit it. Based on the above description, those skilled in the art can make various changes and modifications without departing from the technical concept of this application. The technical scope of this application is not limited to the contents of the specification but must be determined according to the scope of the claims.

Claims

1. A single-component acrylic asphalt anti-corrosion coating for rust prevention, characterized in that: The product comprises the following components in parts by weight: 6-10 parts water, 1-2 parts dispersant, 0.2-0.3 parts pH adjuster, 0.4-0.6 parts defoamer, 5-7 parts aluminum tripolyphosphate, 4-5 parts iron oxide black, 45-55 parts acrylic emulsion, 12-16 parts asphalt, 2.5-3 parts film-forming aid, 0.4-0.6 parts anti-flash rust aid, 0.8-1.2 parts leveling agent, 0.8-1.2 parts rust inhibitor, 1-3 parts rust converter, 12-16 parts graphene oxide composite microspheres, and 2-10 parts silica composite.

2. The single-component acrylic asphalt anti-corrosion coating for rust prevention according to claim 1, characterized in that: The graphene oxide composite microspheres comprise 2-aminophenylthiazolium and modified graphene oxide.

3. The single-component acrylic asphalt anti-corrosion coating for rust prevention according to claim 2, characterized in that: The modified graphene oxide was prepared by the following method: Graphene oxide was mixed with ethanol, then adenosine was added, the mixture was heated and reacted, and then centrifuged and washed to obtain adenosine-based graphene oxide. The adenosine-based graphene oxide was mixed with water to obtain adenosine-based graphene oxide dispersion. β-cyclodextrin was added to the adenosine-based graphene oxide dispersion, the mixture was heated and stirred, and then centrifuged, washed and dried to obtain modified graphene oxide.

4. The single-component acrylic asphalt anti-corrosion coating for rust prevention according to claim 3, characterized in that: The mass ratio of adenosine, graphene oxide and β-cyclodextrin is 1.1:1:(2.8-3.2).

5. The single-component acrylic asphalt anti-corrosion coating for rust prevention according to claim 2, characterized in that: The graphene oxide composite microspheres were prepared using the following method: Modified graphene oxide was mixed with deionized water to obtain a modified graphene oxide dispersion. 2-Aminophenylthiazolium was mixed with acetone and then added to the modified graphene oxide dispersion. The mixture was treated under vacuum, then centrifuged and washed, and finally dried to obtain graphene oxide composite microspheres.

6. The single-component acrylic asphalt anti-corrosion coating for rust prevention according to claim 5, characterized in that: The mass ratio of the modified graphene oxide to 2-aminophenylthiazolium is 1:(0.3-0.4).

7. The single-component acrylic asphalt anti-corrosion coating for rust prevention according to claim 1, characterized in that: The silica composite comprises nano-silica, dopamine hydrochloride, and hexadecyltrimethylammonium chloride.

8. The single-component acrylic asphalt anti-corrosion coating for rust prevention according to claim 7, characterized in that: The silica composite was prepared by the following method: Dopamine hydrochloride and triethanolamine were mixed with water and dispersed. Hexadecyltrimethylammonium chloride was added, and the mixture was heated and stirred. Tetraethyl orthosilicate was added, and the mixture was centrifuged after reaction. Excess hexadecyltrimethylammonium chloride was removed by washing to obtain a preform. The preform was dispersed in ethanol, and then 3-aminopropyltriethoxysilane was added and stirred to react. After washing and drying, a silica complex was obtained.

9. A single-component acrylic asphalt anti-corrosion coating for rust prevention according to claim 8, characterized in that: The mass ratio of dopamine hydrochloride, hexadecyltrimethylammonium chloride and tetraethyl orthosilicate is 1.7:(2.4-2.8):

1.

10. The single-component acrylic asphalt anti-corrosion coating for rust prevention according to claim 1, characterized in that: The mass ratio between the graphene oxide composite microspheres and the silica composite is 1:(0.4-0.6).

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