Aqueous anticorrosive wear-resistant coating and method for its preparation

Abstract

This application provides a water-based anti-corrosion and wear-resistant coating and its preparation method. The preparation method includes uniformly mixing modified MXene nanosheets with a water-based epoxy resin emulsion to obtain a premixed emulsion; under stirring conditions, adding polytetrafluoroethylene powder, titanium dioxide, alumina, a substrate wetting agent, a dispersant, a defoamer, a surface adhesion promoter, deionized water, and a curing agent sequentially to the premixed emulsion, and mixing uniformly to obtain the water-based anti-corrosion and wear-resistant coating. The water-based anti-corrosion and wear-resistant coating of this application, by adding polytetrafluoroethylene and modified MXene nanosheets, improves both the anti-corrosion performance and wear resistance of the water-based coating, overcoming the slight deficiency in anti-corrosion and wear resistance of existing water-based coatings.

Description

Technical Field

[0001] This application relates to the field of materials corrosion protection technology, and in particular to a water-based anti-corrosion and wear-resistant coating and its preparation method. Background Technology

[0002] Metal corrosion is the phenomenon of metals being damaged by the chemical or electrochemical action of the environment. Metals are the primary targets of corrosion, with steel being particularly susceptible. Currently, corrosion causes enormous losses to the national economy. There are various methods of corrosion prevention, such as alloying with other metals, applying a protective coating to the metal surface, plating the metal surface with a corrosion-resistant metal, and oxidizing the metal surface to form a dense oxide film. Among these, applying a protective coating is the most readily available method due to its ease of operation and low cost. A common approach is to apply a coating to the metal surface. Coatings mainly include water-based coatings and solvent-based coatings. The former uses water as a solvent, while the latter primarily uses organic solvents. Therefore, compared to solvent-based coatings, water-based coatings are low-VOC (volatile organic compound) or VOC-free, making them an environmentally friendly green coating. With increasing environmental awareness and a growing focus on personal health, the use of water-based coatings to replace traditional solvent-based coatings is receiving increasing attention. There are many types of water-based coatings, and some water-based coating products have already been put into use. However, current water-based coatings are somewhat lacking in terms of corrosion resistance and abrasion resistance. Therefore, it is necessary to develop a water-based coating that is abrasion-resistant and corrosion-resistant. Summary of the Invention

[0003] This application provides a water-based anti-corrosion and wear-resistant coating and its preparation method, in order to solve the problem that the existing water-based coatings are slightly insufficient in terms of anti-corrosion and wear resistance.

[0004] In a first aspect, this application provides a method for preparing a water-based anti-corrosion and wear-resistant coating, comprising the following steps:

[0005] a) The modified MXene nanosheets were mixed evenly with the aqueous epoxy resin emulsion to obtain a premixed emulsion;

[0006] b) Under stirring conditions, polytetrafluoroethylene powder, titanium dioxide, alumina, substrate wetting agent, dispersant, defoamer, surface adhesion promoter, deionized water and curing agent are added sequentially to the premixed emulsion and mixed evenly to obtain a water-based anti-corrosion and wear-resistant coating.

[0007] This application provides a method for preparing a water-based anti-corrosion and wear-resistant coating, which has the following beneficial effects:

[0008] 1) The method of this application is carried out in the aqueous phase when preparing the coating, which can reduce the emission of organic gases and has the characteristics of not polluting the environment and being green and environmentally friendly.

[0009] 2) In the method of this application, the polytetrafluoroethylene powder added during the preparation of the coating can improve the anti-corrosion performance of the coating, the added titanium dioxide powder can provide the coating with good hiding power, coloring and thickness support, and the addition of alumina can improve the dispersibility of the coating. The combined use of the above materials with the substrate wetting agent, dispersant, defoamer and surface adhesion promoter makes the coating have good stability, hiding power and anti-corrosion performance.

[0010] 3) The method of this application incorporates modified MXene nanosheets and corresponding ingredients, which can effectively improve the anti-corrosion and wear-resistant properties of the coating.

[0011] 4) The method of this application has simple operation steps, mild preparation conditions, and is easy to implement.

[0012] Optionally, by weight, the aqueous epoxy emulsion comprises 20-50 parts, polytetrafluoroethylene comprises 1-3 parts, TiO2 comprises 2-5 parts, Al2O3 comprises 2-7 parts, substrate wetting agent comprises 1-3 parts, dispersant comprises 0.5-3 parts, defoamer comprises 0.1-3 parts, surface adhesion promoter comprises 0.1-3 parts, deionized water comprises 25-35 parts, and curing agent comprises 3-5 parts.

[0013] Alternatively, the modified MXene nanosheets are prepared according to the following method:

[0014] MXene nanosheets were dispersed in an ethanol solution, a silane coupling agent was added, and the mixture was reacted at 80–90 °C for 24–30 h. The resulting mixture was then centrifuged and washed, and the modified MXene nanosheets obtained by centrifugation were freeze-dried for 48–56 h to obtain the modified MXene nanosheets.

[0015] The mass ratio of MXene nanosheets to silane coupling agent is 1:15 to 30;

[0016] MXene nanosheets include Ti3C2Tx-MXene type and Nb2CT type. x -Mxene type, V2CT x -Mxene type or Mo2CT x -Mxene type.

[0017] Optionally, the silane coupling agent includes γ-aminopropyltriethoxysilane.

[0018] Optionally, the substrate wetting agent includes one or more of BYK-3400, BYK-3455, and BYK-301.

[0019] Optionally, the dispersant includes one or more of BYK-154, BYK-021, BYK-028, and BYKJET-9175.

[0020] Optionally, the defoamer includes one or more of BYK-1785, BYK-022, BYK-1724, and BYK-1710.

[0021] Optionally, the adhesion promoter includes one or more of BYK-4509, BYK-4500, and BYK-4513.

[0022] Optionally, pigments and fillers are also added in step b);

[0023] The amount of pigment and filler added is 1 to 3 parts by weight;

[0024] Pigments and fillers include iron oxide red, molybdenum disulfide, or carbon black.

[0025] Secondly, this application provides a water-based anti-corrosion and wear-resistant coating, which is prepared by the method provided in any of the above claims.

[0026] The water-based anti-corrosion and wear-resistant coating provided in this application has the same characteristics and beneficial effects as described in the first aspect above, and will not be repeated here. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application are described clearly and completely below. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are also within the scope of protection of this application.

[0028] In a first aspect, this application provides a method for preparing a water-based anti-corrosion and wear-resistant coating, comprising the following steps:

[0029] a) The modified MXene nanosheets were mixed evenly with the aqueous epoxy resin emulsion to obtain a premixed emulsion;

[0030] b) Under stirring conditions, polytetrafluoroethylene powder, titanium dioxide, alumina, substrate wetting agent, dispersant, defoamer, surface adhesion promoter, deionized water and curing agent are added sequentially to the premixed emulsion and mixed evenly to obtain a water-based anti-corrosion and wear-resistant coating.

[0031] In this application, the process of uniformly mixing modified MXene nanosheets with an aqueous epoxy resin emulsion is as follows: After preparing an amino-modified MXene nanosheet dispersion, it is mixed with the aqueous epoxy emulsion and then ultrasonically dispersed. Specifically, 20–30 times the weight of water is added to the amino-modified MXene nanosheets, and the mixture is stirred at 400–600 rpm for 5–10 minutes to obtain a dispersion system. Simultaneously, the dispersion system is ultrasonically treated at a frequency of 80–100 kHz. After stirring, ultrasonication continues for another 5–10 minutes. The above stirring and ultrasonic operations ensure uniform dispersion of the modified MXene nanosheets, avoiding the undesirable consequences of agglomeration and clumping caused by uneven dispersion when mixing the modified MXene nanosheets with the aqueous epoxy resin emulsion.

[0032] In this application, titanium dioxide can impart hiding power, color saturation, and thickness support to the coating.

[0033] Alumina: It has good dispersibility in coatings and can effectively prevent sedimentation and stratification of coatings.

[0034] Polytetrafluoroethylene (PTFE): can increase the corrosion resistance and wear resistance of the coating.

[0035] In this application, when the premixed emulsion is mixed with other materials, the stirring rate is 1000-1200 rpm and the stirring time is 0.5-1 h.

[0036] The waterborne epoxy resin emulsion in this application may be a commercially available waterborne epoxy resin emulsion (such as an emulsion formulated with epoxy resins E-51, E-55, E-44, etc.), or may be the waterborne epoxy resin emulsion provided in application number: 202410518939.0.

[0037] This application provides a method for preparing a water-based anti-corrosion and wear-resistant coating, which has the following beneficial effects:

[0038] 1) The method of this application is carried out in the aqueous phase when preparing the coating, which can reduce the emission of organic gases and has the characteristics of not polluting the environment and being green and environmentally friendly.

[0039] 2) In the method of this application, the polytetrafluoroethylene powder added during the preparation of the coating can improve the anti-corrosion performance of the coating, the added titanium dioxide powder can provide the coating with good hiding power, coloring and thickness support, and the addition of alumina can improve the dispersibility of the coating. The combined use of the above materials with the substrate wetting agent, dispersant, defoamer and surface adhesion promoter makes the coating have good stability, hiding power and anti-corrosion performance.

[0040] 3) Modified MXene nanosheets are added to the method of this application. Since the modified MXene nanosheets have a sheet-like structure, when they are coated on the surface of the workpiece or the object to be protected, the staggered stacking of these sheet-like structures can not only improve the strength of the cured coating, but also form a dense protective layer, further reducing the intrusion of oxygen, moisture and other substances into the substrate, thereby achieving protection of the substrate material. When used together with the corresponding ingredients, it can effectively improve the anti-corrosion and wear resistance of the coating.

[0041] 4) The method of this application has simple operation steps, mild preparation conditions, and is easy to implement.

[0042] Optionally, by weight, the aqueous epoxy emulsion comprises 20-50 parts, polytetrafluoroethylene comprises 1-3 parts, TiO2 comprises 2-5 parts, Al2O3 comprises 2-7 parts, substrate wetting agent comprises 1-3 parts, dispersant comprises 0.5-3 parts, defoamer comprises 0.1-3 parts, surface adhesion promoter comprises 0.1-3 parts, deionized water comprises 25-35 parts, and curing agent comprises 3-5 parts.

[0043] In this application, the curing agent includes amine curing agents, such as aliphatic amines, cycloaliphatic amines, aromatic amines, and polyamides. The curing agent should be added just before coating (add it immediately before use) to prevent premature curing of the coating.

[0044] Alternatively, the modified MXene nanosheets are prepared according to the following method:

[0045] MXene nanosheets were dispersed in an ethanol solution, a silane coupling agent was added, and the mixture was reacted at 80–90 °C for 24–30 h. The resulting mixture was then centrifuged and washed, and the modified MXene nanosheets obtained by centrifugation were freeze-dried for 48–56 h to obtain the modified MXene nanosheets.

[0046] The mass ratio of MXene nanosheets to silane coupling agent is 1:15 to 30;

[0047] The types of MXene nanosheets include Ti3C2T x -MXene type, Nb2CT x -Mxene type, V2CT x -Mxene type or Mo2CT x -Mxene type.

[0048] In this application, the ethanol solution is prepared by mixing ethanol and water in a certain volume ratio, which is 20:1 to 5.

[0049] In this application, MXene nanosheets are obtained by intercalation and separation of accordion-shaped multilayer MXene materials. Specifically, multilayer MXene is placed in a reaction vessel, an intercalating agent is added, and the mixture is stirred at 1000–1200 rpm at room temperature for 2–24 h. After the reaction, the mixture is centrifuged at 3000–4000 rpm for 0.5–1 h to remove excess intercalating agent. The intercalated MXene is washed 2–3 times with deionized water, then ultrasonically dispersed for 12–16 h, and then centrifuged at 3500–4000 rpm to collect the supernatant. The supernatant is freeze-dried for 48–52 h to obtain MXene nanosheets.

[0050] The mass ratio of the multilayer MXene material to the intercalating agent is 1:10 to 12, and the intercalating agent is one or more of dimethyl sulfoxide (DMSO), tetramethylammonium hydroxide (TMAOH), tetrabutylammonium hydroxide (TBAOH), and ethanol (ET).

[0051] Optionally, the silane coupling agent includes γ-aminopropyltriethoxysilane.

[0052] In this application, during the modification of MXene nanosheets using γ-aminopropyltriethoxysilane, the ethoxy groups in the γ-aminopropyltriethoxysilane hydrolyze, generating corresponding silanol groups in the silane coupling agent. These silanol groups then condense with active groups on the MXene nanosheets, such as hydroxyl groups, thus grafting the silane coupling agent onto the MXene nanosheets to obtain amino-modified MXene nanosheets. Due to the hydrophilicity of amino groups, they can be well dispersed in aqueous epoxy emulsions. Furthermore, because the amino-modified MXene nanosheets have a sheet-like structure, when coated on the surface of a workpiece or object to be protected, the staggered stacking of these sheet-like structures not only improves the strength of the cured coating but also forms a dense protective layer, further reducing the intrusion of oxygen and moisture into the substrate, thereby protecting the substrate material.

[0053] In one feasible approach, the silane coupling agent also includes γ-mercaptopropyltriethoxysilane, which is used in combination with γ-aminopropyltriethoxysilane to modify MXene nanosheets, with both added in equimolar amounts. The combination of γ-mercaptopropyltriethoxysilane and γ-aminopropyltriethoxysilane enhances the anti-corrosion effect because the addition of γ-aminopropyltriethoxysilane increases the hydrophilicity of MXene nanosheets, thereby improving their dispersion performance in coatings. Furthermore, the addition of γ-mercaptopropyltriethoxysilane, due to the tendency of the thiol groups to form disulfide bonds and absorb oxygen, and their subsequent reduction to thiol groups under suitable environments (acidic or reducing conditions), further enhances the anti-corrosion effect.

[0054] Optionally, the substrate wetting agent includes one or more of BYK-3400, BYK-3455, and BYK-301.

[0055] In this application, the substrate wetting agent is a surfactant that works by reducing the surface energy of the substrate, allowing water to spread on or penetrate the surface of the solid material, thereby wetting the solid material.

[0056] Optionally, the dispersant includes one or more of BYK-154, BYK-021, BYK-028, and BYKJET-9175.

[0057] In this application, the dispersant is a surfactant, whose main function is to enable the various components in the coating to be uniformly dispersed in the system to form a stable suspension.

[0058] Optionally, the defoamer includes one or more of BYK-1785, BYK-022, BYK-1724, and BYK-1710.

[0059] In this application, the defoamer is used to eliminate bubbles generated during stirring and other operations, thereby stabilizing the coating system.

[0060] Optionally, the adhesion promoter includes one or more of BYK-4509, BYK-4500, and BYK-4513.

[0061] Adhesives have the following advantages: they can significantly improve the bonding strength between resins and various substrates; they can improve the interlayer adhesion between paint topcoats and primers, and improve the moisture resistance, salt spray resistance and heat resistance of the coating film; they are stable in nature and have excellent storage stability and long-lasting effect in paint and coating systems.

[0062] Optionally, pigments and fillers are also added in step b);

[0063] The amount of pigment and filler added is 1 to 3 parts by weight;

[0064] Pigments and fillers include iron oxide red, molybdenum disulfide, or carbon black.

[0065] In this application, pigments and fillers can impart corresponding colors to the coating to improve the opacity of the coating. In actual production, pigments and fillers of different colors can be selected according to actual needs.

[0066] Secondly, this application provides a water-based anti-corrosion and wear-resistant coating, which is prepared by the method provided in any of the above claims.

[0067] The water-based anti-corrosion and wear-resistant coating provided in this application has the same characteristics and beneficial effects as described in the first aspect above, and will not be repeated here. Specific Implementation

[0069] The MXene nanosheets in the following examples were prepared according to the following method:

[0070] Multilayer MXene (Ti3C2Tx type Ti3C2AlMxene is used as an example in this application) was placed in a reaction vessel, and intercalating agent TBAOH was added (the mass ratio of multilayer MXene material to intercalating agent was 1:10). The mixture was stirred at 1000 rpm at room temperature for 6 h. After the reaction, the mixture was centrifuged at 3500 rpm for 0.5 h to remove excess intercalating agent. The intercalated MXene was washed 2-3 times with deionized water, then ultrasonically dispersed for 12 h, and then centrifuged at 3500 rpm to collect the supernatant. The supernatant was freeze-dried for 48 h to obtain MXene nanosheets.

[0071] The aqueous epoxy emulsions used in the following examples and comparative examples are the aqueous epoxy resin emulsions provided in application number: 202410518939.0.

[0072] Example 1

[0073] A water-based anti-corrosion and wear-resistant coating is prepared by the following method:

[0074] S101. Add MXene nanosheets to a reaction vessel, add ethanol solution (ethanol:water volume ratio of 9:1), sonicate for 20 min, then add silane coupling agent (γ-aminopropyltriethoxysilane), react at 80℃ for 24 h, then centrifuge and wash the mixture after reaction, and freeze-dry the modified MXene nanosheets obtained by centrifugation for 48 h to obtain modified MXene nanosheets. The mass ratio of MXene nanosheets to silane coupling agent is 1:15.

[0075] S102. Take 0.5 parts by weight of modified MXene nanosheets and add 20 times the weight of water. Stir at 400 rpm for 10 min to obtain a dispersion system. At the same time, sonicate the dispersion system at a frequency of 80 kHz. After stirring, continue sonicating for 10 min to obtain the modified MXene nanosheet dispersion system.

[0076] S103. Add 20 parts by weight of waterborne epoxy emulsion to the modified MXene nanosheet dispersion system and stir at 400 rpm for 15 min. Then add 1 part of polytetrafluoroethylene, 2 parts of TiO2, 2 parts of Al2O3, 1 part of substrate wetting agent (BYK-3400), 0.5 parts of dispersant (BYK-154), 0.1 parts of defoamer (BYK-1785), 0.1 parts of surface adhesion promoter (BYK-4509), 25 parts of deionized water, 3 parts of curing agent (DY-175 waterborne epoxy curing agent), and 1 part of iron oxide red. Continue stirring for 30 min to obtain the final waterborne anti-corrosion and wear-resistant coating.

[0077] Example 2

[0078] A water-based anti-corrosion and wear-resistant coating is prepared by the following method:

[0079] S201. Add MXene nanosheets to a reaction vessel, add ethanol solution (ethanol:water volume ratio of 19:1), sonicate for 30 min, then add silane coupling agent (γ-aminopropyltriethoxysilane), react at 90℃ for 30 h, then centrifuge and wash the mixture after reaction, and freeze-dry the modified MXene nanosheets obtained by centrifugation for 56 h to obtain modified MXene nanosheets. The mass ratio of MXene nanosheets to silane coupling agent is 1:30.

[0080] S202. Take 0.5 parts by weight of modified MXene nanosheets and add 30 times the weight of water. Stir at 600 rpm for 5 min to obtain a dispersion system. At the same time, sonicate the dispersion system at a frequency of 100 kHz. After stirring, continue sonicating for 5 min to obtain the modified MXene nanosheet dispersion system.

[0081] S203. Add 50 parts by weight of waterborne epoxy emulsion to the modified MXene nanosheet dispersion system and stir at 300 rpm for 20 min. Then add 3 parts of polytetrafluoroethylene, 5 parts of TiO2, 7 parts of Al2O3, 3 parts of substrate wetting agent (BYK-3400), 3 parts of dispersant (BYK-154), 3 parts of defoamer (BYK-1785), 3 parts of surface adhesion promoter (BYK-4509), 35 parts of deionized water, 5 parts of curing agent (DY-175 waterborne epoxy curing agent), and 3 parts of molybdenum disulfide. Continue stirring for 30-45 min to obtain the final waterborne anti-corrosion and wear-resistant coating.

[0082] Example 3

[0083] A water-based anti-corrosion and wear-resistant coating is prepared by the following method:

[0084] S301. Add MXene nanosheets to a reaction vessel, add ethanol solution (ethanol:water volume ratio of 17:3), sonicate for 25 min, then add silane coupling agent (γ-aminopropyltriethoxysilane), react at 85℃ for 27 h, then centrifuge and wash the mixture after reaction, and freeze-dry the modified MXene nanosheets obtained by centrifugation for 52 h to obtain modified MXene nanosheets. The mass ratio of MXene nanosheets to silane coupling agent is 1:25.

[0085] S302. Take 1.0 part of modified MXene nanosheets by weight, add 25 times the weight of water, and stir at 500 rpm for 8 min to obtain a dispersion system. At the same time, sonicate the dispersion system at a frequency of 90 kHz. After stirring, continue sonicating for 8 min to obtain the modified MXene nanosheet dispersion system.

[0086] S303. Add 35 parts by weight of waterborne epoxy emulsion to the modified MXene nanosheet dispersion system and stir at 350 rpm for 18 min. Then add 2 parts of polytetrafluoroethylene, 3.5 parts of TiO2, 5 parts of Al2O3, 2 parts of substrate wetting agent (BYK-3400), 2 parts of dispersant (BYK-154), 2 parts of defoamer (BYK-1785), 1.5 parts of surface adhesion promoter (BYK-4509), 30 parts of deionized water, 4 parts of curing agent (DY-175 waterborne epoxy curing agent), and 2 parts of iron oxide red. Continue stirring for 40 min to obtain the final waterborne anti-corrosion and wear-resistant coating.

[0087] Example 4

[0088] A water-based anti-corrosion and wear-resistant coating is prepared by the following method:

[0089] S401. Add MXene nanosheets to a reaction vessel, add ethanol solution (ethanol:water volume ratio of 9:1), sonicate for 30 min, then add silane coupling agent (γ-aminopropyltriethoxysilane), react at 80-90℃ for 24 h, then centrifuge and wash the mixture after reaction, and freeze-dry the modified MXene nanosheets obtained by centrifugation for 48 h to obtain modified MXene nanosheets. The mass ratio of MXene nanosheets to silane coupling agent is 1:20.

[0090] S402. Take 1.0 part of modified MXene nanosheets by weight, add 30 times the weight of water, and stir at 400 rpm for 10 min to obtain a dispersion system. At the same time, sonicate the dispersion system at a frequency of 80 kHz. After stirring, continue sonicating for 10 min to obtain the modified MXene nanosheet dispersion system.

[0091] S403. Add 35 parts by weight of waterborne epoxy emulsion to the modified MXene nanosheet dispersion system and stir at 400 rpm for 20 min. Then add 2 parts of polytetrafluoroethylene, 3.5 parts of TiO2, 4.5 parts of Al2O3, 2 parts of substrate wetting agent (BYK-3400), 1.5 parts of dispersant (BYK-154), 1.5 parts of defoamer (BYK-1785), 1.0 part of surface adhesion promoter (BYK-4509), 35 parts of deionized water, 3 parts of curing agent (DY-175 waterborne epoxy curing agent), and 2 parts of molybdenum disulfide. Continue stirring for 45 min to obtain the final waterborne anti-corrosion and wear-resistant coating.

[0092] Example 5

[0093] A water-based anti-corrosion and wear-resistant coating is prepared by the following method:

[0094] S501 and the rest of the operation are the same as S401, except that the silane coupling agent also includes γ-mercaptopropyltriethoxysilane, and the molar ratio of γ-aminopropyltriethoxysilane to γ-mercaptopropyltriethoxysilane is 1:1.

[0095] S502, same operation as S402.

[0096] S503 operates the same as S403.

[0097] Comparative Example 1

[0098] D101 and the rest of the operations are the same as those in S402, except that modified MXene nanosheets are not added.

[0099] D102, same operation as S403.

[0100] Experimental Example

[0101] The water-based anti-corrosion and wear-resistant coatings prepared in Examples 1 to 5 and Comparative Example 1 were sprayed onto the surfaces of Q235 steel plates and tinplate for performance testing. The thickness of the prepared anti-corrosion coatings was 40±2μm. Q235 steel plates were used as the substrate for salt spray testing, while tinplate was used as the substrate for the other experiments. The coating performance was evaluated using salt spray testing (GB / T 10125-2021 Artificial Atmosphere Corrosion Test - Salt Spray Test), impact testing (GB / T 1732-2020 Paint Film Impact Resistance Method), adhesion testing (GB / T1720-2020 Paint Film Scratch Test), and abrasion resistance testing (GB / T 1768-2006 Determination of Abrasion Resistance of Paints and Varnishes - Rotating Rubber Grinding Wheel Method). For the salt spray test, no scratch treatment was performed; the test endpoint was the appearance of rust spots on the sample. The test results are shown in Table 1.

[0102] Table 1

[0103]

[0104] As can be seen from the data in Table 1, the water-based coating of this application has good performance in terms of impact resistance and corrosion prevention.

[0105] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A method for preparing a water-based anti-corrosion and wear-resistant coating, characterized in that, Includes the following steps: a) The modified MXene nanosheets are mixed evenly with the aqueous epoxy resin emulsion to obtain a premixed emulsion. The process of mixing the modified MXene nanosheets with the aqueous epoxy resin emulsion is as follows: 20 to 30 times the weight of water is added to the amino-modified MXene nanosheets, and then the mixture is stirred at 400 to 600 rpm for 5 to 10 minutes to obtain a dispersion system. At the same time, the dispersion system is subjected to ultrasonic treatment at a frequency of 80 to 100 kHz. After stirring, the mixture is further ultrasonicated for 5 to 10 minutes, and then mixed with the aqueous epoxy emulsion and ultrasonically dispersed. The modified MXene nanosheets were prepared according to the following method: MXene nanosheets were dispersed in an ethanol solution, a silane coupling agent was added, and the mixture was reacted at 80-90℃ for 24-30 h. The resulting mixture was then centrifuged and washed, and the modified MXene nanosheets obtained by centrifugation were freeze-dried for 48-56 h to obtain the modified MXene nanosheets. The mass ratio of MXene nanosheets to silane coupling agent is 1:15~30; Silane coupling agents include equimolar mixtures of γ-mercaptopropyltriethoxysilane and γ-aminopropyltriethoxysilane; b) Under stirring conditions, polytetrafluoroethylene powder, titanium dioxide, alumina, substrate wetting agent, dispersant, defoamer, surface adhesion promoter, deionized water and curing agent are added sequentially to the premixed emulsion and mixed evenly to obtain a water-based anti-corrosion and wear-resistant coating.

2. The method for preparing the water-based anti-corrosion and wear-resistant coating according to claim 1, characterized in that, By weight, the components are: 20-50 parts of waterborne epoxy emulsion, 1-3 parts of polytetrafluoroethylene, 2-5 parts of TiO2, 2-7 parts of Al2O3, 1-3 parts of substrate wetting agent, 0.5-3 parts of dispersant, 0.1-3 parts of defoamer, 0.1-3 parts of surface adhesion promoter, 25-35 parts of deionized water, and 3-5 parts of curing agent.

3. The method for preparing the water-based anti-corrosion and wear-resistant coating according to claim 1, characterized in that, The MXene nanosheets include Ti3C2Tx-MXene type and Nb2CT type. x -Mxene type, V2CT x -Mxene type or Mo2CT x -Mxene type.

4. The method for preparing the water-based anti-corrosion and wear-resistant coating according to claim 1, characterized in that, The substrate wetting agent includes one or more of BYK-3400, BYK-3455, and BYK-301.

5. The method for preparing the water-based anti-corrosion and wear-resistant coating according to claim 1, characterized in that, The dispersant includes one or more of BYK-154, BYK-021, BYK-028, and BYKJET-9175.

6. The method for preparing the water-based anti-corrosion and wear-resistant coating according to claim 1, characterized in that, The defoamer includes one or more of BYK-1785, BYK-022, BYK-1724, and BYK-1710.

7. The method for preparing the water-based anti-corrosion and wear-resistant coating according to claim 1, characterized in that, The adhesion promoter includes one or more of BYK-4509, BYK-4500, and BYK-4513.

8. The method for preparing the water-based anti-corrosion and wear-resistant coating according to claim 1, characterized in that, In step b), pigments and fillers are also added; The amount of pigment and filler added according to the weight parts is 1 to 3 parts; The pigments and fillers include iron oxide red, molybdenum disulfide, or carbon black.

9. The method for preparing the water-based anti-corrosion and wear-resistant coating according to claim 1, characterized in that, MXene nanosheets were obtained by intercalation and separation of accordion-shaped multilayer MXene materials. Specifically, multilayer MXene was placed in a reaction vessel, an intercalating agent was added, and the mixture was stirred at 1000-1200 rpm at room temperature for 2-24 hours. After the reaction, the mixture was centrifuged at 3000-4000 rpm for 0.5-1 hours to remove excess intercalating agent. The intercalated MXene was washed with deionized water 2-3 times, then ultrasonically dispersed for 12-16 hours, and then centrifuged at 3500-4000 rpm. The supernatant was collected and freeze-dried for 48-52 hours to obtain MXene nanosheets. The mass ratio of the multilayer MXene material to the intercalating agent is 1:10~12, and the intercalating agent is one or more of dimethyl sulfoxide, tetramethylammonium hydroxide, tetrabutylammonium hydroxide and ethanol.

10. A water-based anti-corrosion and wear-resistant coating, characterized in that, Including water-based anti-corrosion and wear-resistant coatings prepared by the method according to any one of claims 1 to 9.

Images