Functional filler, corrosion-resistant wear-resistant self-repairing inorganic phosphate ceramic coating and preparation method thereof

Abstract

The invention discloses a functional filler, a corrosion-resistant wear-resistant self-repairing inorganic phosphate ceramic coating and a preparation method of the corrosion-resistant wear-resistant self-repairing inorganic phosphate ceramic coating, and belongs to the technical field of material surface modification. The MC-coated Ti < 3 > C < 2 > T < x > MXene corrosion-resistant wear-resistant self-repairing functional material is prepared by adopting a one-pot method, microcapsules embedded with a 1H, 1H, 2H, 2H-perfluorodecyl triethoxy silane repairing agent are generated in situ on the surfaces of Ti < 3 > C < 2 > T < x > MXene nanosheets, and a multi-scale heterostructure constructed by the microcapsules and the Ti < 3 > C < 2 > T < x > MXene nanosheets can effectively improve the interlayer agglomeration problem of the Ti < 3 > C < 2 > T < x > MXene nanosheets, so that the corrosion-resistant wear-resistant self-repairing functional material can be used for repairing the corrosion-resistant wear-resistant self-repairing functional material. And the dispersity and compatibility of the coating in a phosphate binder are greatly improved, so that the wear resistance and corrosion resistance of the coating are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of material surface modification, and in particular relates to a functional filler, a corrosion-resistant and wear-resistant self-repairing inorganic phosphate ceramic coating and a preparation method thereof. Background Art

[0002] With the development of aerospace, marine equipment, and high-end manufacturing, corrosion and wear of metal structural materials in complex service environments are becoming increasingly prominent, seriously threatening their service life and safety performance. Surface coating technology, as an important means of improving metal durability, has been widely used in industrial protection. Among them, inorganic phosphate ceramic coatings have become a promising inorganic coating material due to their excellent adhesion, high temperature resistance, and environmentally friendly properties.

[0003] However, existing inorganic phosphate ceramic coatings still suffer from inherent high porosity, brittleness, and a lack of self-healing capabilities, making them difficult to meet the high reliability requirements of long-term service. To enhance their overall performance, nanoparticles or two-dimensional materials such as MXene can be introduced into the coating to improve its corrosion resistance and mechanical properties. However, MXene is easily oxidized, has poor dispersibility, and exhibits poor interfacial compatibility with the coating substrate, limiting the stability and controllability of its enhancement effect.

[0004] In addition, in order to improve the long-term service capability of the coating, coatings with self-healing capabilities have emerged. However, self-healing coatings are generally concentrated on organic coatings, and inorganic coatings, especially inorganic phosphate ceramic coatings, are rarely studied. In order to give inorganic phosphate ceramic coatings self-healing capabilities, organic repair agents can be added to the coating. However, there is a problem of incompatibility between organic repair agents and inorganic frameworks, which often leads to weak interfacial adhesion and poor long-term durability. Encapsulating the repair agent in microcapsules can effectively solve the compatibility problem between organic and inorganic, but this method generally has problems such as uneven dispersion of microcapsules, unstable aggregation and rupture, and weak bonding with the inorganic matrix, resulting in low coating repair efficiency and unsatisfactory long-term protective effect. Therefore, there is an urgent need for a new functional enhancement strategy with good dispersibility, structural stability and self-healing ability to solve the above technical difficulties, so as to prepare corrosion-resistant and wear-resistant inorganic phosphate ceramic coatings with self-healing capabilities. Summary of the Invention

[0005] The purpose of this section is to summarize some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract and title of this application to avoid obscuring the purpose of this section, the abstract and the title of the invention, and such simplifications or omissions should not be used to limit the scope of the present invention.

[0006] In view of the above problems and / or the problems existing in the prior art, the present invention is proposed.

[0007] Microcapsules often agglomerate and disperse poorly in coatings, resulting in poor wear resistance. Therefore, the present invention incorporates MXene and in-situ generates microcapsules on the MXene surface, synergistically improving wear and corrosion resistance while also imparting self-healing capabilities.

[0008] Therefore, the object of the present invention is to overcome the deficiencies in the prior art and provide a method for preparing a functional filler.

[0009] In order to solve the above technical problems, the present invention provides the following technical solutions, including:

[0010] Mix urea, formaldehyde and water and stir, adjust the pH to 8-9, heat and stir in an oil bath to form a urea-formaldehyde prepolymer, and obtain an aqueous phase;

[0011] Add the repair agent to the toluene solvent and stir evenly to obtain an oil phase;

[0012] The oil phase and few-layer Ti3C2T x The MXene dispersion was added to the aqueous phase at the same time, the pH was adjusted to 2-3, heated in an oil bath, stirred, washed, centrifuged, and dried to obtain a functional filler, which was recorded as MC@Ti3C2T x MXene;

[0013] Wherein, the water phase, oil phase and few-layer Ti3C2T x The mass ratio of MXene dispersion is 45:15:0.5~1.

[0014] As a preferred embodiment of the method for preparing the functional filler of the present invention, the mass ratio of urea, formaldehyde and water is 1:2:6; the mass ratio of the repairing agent and toluene solvent is 1:1-3.

[0015] As a preferred embodiment of the method for preparing the functional filler of the present invention, the repair agent includes 1H, 1H, 2H, 2H-perfluorodecyltriethoxysilane.

[0016] As a preferred embodiment of the method for preparing the functional filler of the present invention, the oil bath has an oil bath temperature of 50 to 70° C. and an oil bath time of 1 to 2 hours.

[0017] Another object of the present invention is to overcome the deficiencies in the prior art and provide a functional filler.

[0018] The third object of the present invention is to overcome the deficiencies in the prior art and provide a corrosion-resistant, wear-resistant, self-repairing inorganic phosphate ceramic coating.

[0019] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0020] The coating comprises, based on the mass percentage of raw materials, 40-60% of ceramic aggregate, 35-45% of phosphate binder, 1-3% of curing agent, and 0.035-0.27% of the functional filler according to claim 5.

[0021] As a preferred solution of the corrosion-resistant, wear-resistant and self-repairing inorganic phosphate ceramic coating of the present invention, the addition amount of the functional filler is 0.1 to 0.6 wt.% of the mass percentage of the phosphate binder.

[0022] As a preferred solution of the corrosion-resistant, wear-resistant and self-repairing inorganic phosphate ceramic coating of the present invention, the ceramic aggregate includes one or more of aluminum oxide, silicon carbide and zirconium oxide.

[0023] As a preferred solution of the corrosion-resistant, wear-resistant and self-repairing inorganic phosphate ceramic coating described in the present invention, the phosphate binder includes one or more of aluminum dihydrogen phosphate, magnesium phosphate, and chromium phosphate; and the curing agent includes one or more of zinc oxide, magnesium oxide, and copper oxide.

[0024] The third object of the present invention is to overcome the deficiencies in the prior art and provide a method for preparing a corrosion-resistant, wear-resistant, self-repairing inorganic phosphate ceramic coating.

[0025] In order to solve the above technical problems, the present invention provides the following technical solutions, including:

[0026] The functional filler is added to the phosphate binder and dispersed evenly to obtain a mixed slurry; ceramic aggregate and a curing agent are added to the mixed slurry at the same time and stirred evenly to obtain a corrosion-resistant, wear-resistant and self-repairing inorganic phosphate ceramic coating;

[0027] The corrosion-resistant, wear-resistant and self-repairing inorganic phosphate ceramic coating is scraped and then dried and cured in a stepwise manner to obtain the corrosion-resistant, wear-resistant and self-repairing inorganic phosphate ceramic coating.

[0028] Beneficial effects of the present invention:

[0029] (1) The present invention adopts a one-pot method to prepare MC@Ti3C2T x MXene corrosion-resistant and wear-resistant self-repairing functional materials, in Ti3C2T x Microcapsules embedded with 1H, 1H, 2H, 2H-perfluorodecyltriethoxysilane as a healing agent were in situ generated on the surface of MXene nanosheets. x The multi-scale heterogeneous structure constructed by MXene nanosheets can effectively improve the performance of Ti3C2T x The interlayer agglomeration problem of MXene nanosheets greatly improves their dispersibility and compatibility in phosphate binders, thereby improving the wear resistance and corrosion resistance of the coating.

[0030] (2) MC@Ti3C2T prepared by the present invention x MXene filler effectively carries and transmits 1H, 1H, 2H, 2H-perfluorodecyltriethoxysilane organic repair agent, avoiding the problem of incompatibility between organic repair agent and inorganic binder.

[0031] (3) The present invention is based on MC@Ti3C2T x The corrosion-resistant and wear-resistant self-repairing inorganic phosphate ceramic coating prepared by MXene filler is MC@Ti3C2T x MXene fillers will release pre-embedded organic repair agents, which will undergo cross-linking reactions when exposed to water. x The silane film generated on the surface of MXene nanosheets can reduce the surface energy and act as a physical barrier, thereby improving the corrosion resistance of the coating and making the coating exhibit self-healing capabilities.

[0032] (4) The corrosion-resistant and wear-resistant self-repairing phosphate ceramic coating prepared by the present invention cleverly utilizes the adverse factors in the service environment, such as external loads and corrosive liquids, and uses the adverse factors as the driving force for the self-repair of the coating, turning harm into benefit. The entire process does not require any human intervention. The organic repair agent in the microcapsule and the Ti3C2T x Due to the synergistic effect of MXene nanosheets, the coating exhibits excellent corrosion and wear resistance.

[0033] (5) The novel corrosion-resistant, wear-resistant, self-repairing phosphate ceramic coating provided by the present invention has a simple preparation process, is mainly composed of inorganic materials, and is green and environmentally friendly. Compared with traditional organic coatings, it is more suitable for metal protection in the natural ecological environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive effort. Among them:

[0035] Figure 1 MC@Ti3C2T prepared by the present invention x SEM image of MXene filler.

[0036] Figure 2 This is a microscopic morphology of the surface of the corrosion-resistant, wear-resistant, self-repairing phosphate ceramic coating prepared in Example 1 of the present invention.

[0037] Figure 3This is a cross-sectional morphology of the corrosion-resistant, wear-resistant, self-repairing inorganic phosphate ceramic coating prepared in Example 1 of the present invention.

[0038] Figure 4 This is a cross-sectional morphology of the inorganic phosphate ceramic coating prepared in Comparative Example 2 of the present invention.

[0039] Figure 5 These are macroscopic morphologies of the corrosion-resistant and wear-resistant self-repairing inorganic phosphate ceramic coating with artificial defects prepared in Example 1 of the present invention before and after repair. DETAILED DESCRIPTION

[0040] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the embodiments of the specification.

[0041] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0042] Secondly, the term "one embodiment" or "embodiment" herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in various places throughout this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive of other embodiments.

[0043] Unless otherwise specified, the raw materials used in the present invention are all commercially available.

[0044] The corrosion resistance of the coating was tested using a CHI750E electrochemical workstation. A saturated calomel electrode served as the reference electrode, a platinum electrode served as the counter electrode, the coating served as the working electrode, and a 3.5 wt% sodium chloride aqueous solution served as the electrolyte. Artificial scratches were introduced onto the coating surface, and the coating's self-healing ability was evaluated based on the change in low-frequency impedance before and after immersion.

[0045] The tribological properties of the coating were tested using an MFT-5000 friction and wear tester. A 9mm diameter silicon nitride ball was used as the grinding pair. The reciprocating motion module was selected, with a load of 10N, a friction time of 30 minutes, a reciprocating distance of 10mm, and a frequency of 2Hz. The coating remained in a water environment throughout the friction process.

[0046] Example 1

[0047] This embodiment provides a method for preparing an inorganic phosphate ceramic coating, specifically:

[0048] The corrosion-resistant and wear-resistant self-repairing inorganic phosphate ceramic coating uses aluminum dihydrogen phosphate as a binder, aluminum oxide as a ceramic aggregate, and zinc oxide as a curing agent. x MXene is a corrosion-resistant, wear-resistant, self-repairing functional filler (MC is a urea-formaldehyde microcapsule coated with a repair agent). MC@Ti3C2T x The mass percentage of MXene filler in phosphate binder is 0.5wt.%;

[0049] The specific preparation steps are as follows:

[0050] 1) 10 g of 37% formaldehyde was mixed with 30 ml of deionized water, 5 g of urea was added, and the mixture was stirred thoroughly to completely dissolve the urea. The pH was adjusted to 9, and the mixture was heated in an oil bath at 60°C for 2 h to obtain an aqueous microcapsule prepolymer. 5 g of a repair agent, 1H, 1H, 2H, 2H-perfluorodecyltriethoxysilane, was mixed with 10 g of a toluene solvent (i.e., the mass ratio of the repair agent to the solvent was 1:2), and the mixture was stirred thoroughly for 20 min to obtain an oil phase. All the oil phases were mixed with 0.75 g of a few-layer Ti3C2T x MXene dispersion was added dropwise to the aqueous phase (i.e., aqueous phase, oil phase and few-layer Ti3C2T x The mass ratio of the MXene dispersion was 45:15:0.75), the pH was adjusted to 3, and the mixture was heated in an oil bath at 60°C for 2 h. After centrifugal washing and drying at 60°C, MC@Ti3C2T x MXene corrosion-resistant, wear-resistant and self-healing filler.

[0051] 2) 0.2g of MC@Ti3C2T x The MXene corrosion-resistant and wear-resistant self-repairing filler was mixed with 40 g of aluminum dihydrogen phosphate binder (i.e., the self-repairing filler accounted for 0.5 wt.% of the phosphate binder), magnetically stirred for 30 min, and ultrasonically dispersed for 30 min to obtain a mixed slurry.

[0052] 3) Add 55 g of alumina ceramic aggregate and 2 g of zinc oxide curing agent to the mixed slurry, and magnetically stir at a speed of 400 rpm at room temperature for 2 h to obtain a corrosion-resistant, wear-resistant, self-repairing inorganic phosphate ceramic coating.

[0053] 4) Polish the stainless steel substrate with sandpaper, clean the surface with acetone and ethanol, and apply the coating to the substrate using a doctor blade. After standing at room temperature for 24 hours, cure the coating using a stepwise process: heating at 50°C for 90 minutes, 90°C for 15 minutes, 110°C for 15 minutes, 150°C for 15 minutes, and 200°C for 90 minutes. Cool the coating to room temperature in the furnace to obtain a corrosion-resistant, wear-resistant, self-repairing inorganic phosphate ceramic coating.

[0054] Figure 1 MC@Ti3C2Tx From the SEM image of MXene fillers, it can be seen that a large number of spherical microcapsules are uniformly loaded on the Ti3C2T x The surface of MXene nanosheets, showing MC@Ti3C2T x MXene corrosion-resistant and wear-resistant self-healing filler was successfully prepared.

[0055] Figure 2 This is a surface microscopic morphology of the corrosion-resistant, wear-resistant, self-repairing inorganic phosphate ceramic coating prepared in Example 1 of the present invention. As can be seen from the figure, the ceramic aggregates are tightly bonded and the porosity is reduced.

[0056] Example 2

[0057] The difference between this embodiment and embodiment 1 is that the MC@Ti3C2T x The addition amount of MXene corrosion-resistant, wear-resistant and self-repairing functional filler is 0.04 g, and the mass percentage in the phosphate binder is 0.1 wt.%. The rest of the preparation process is the same as that in Example 1 to obtain a corrosion-resistant, wear-resistant and self-repairing inorganic phosphate ceramic coating.

[0058] Example 3

[0059] The difference between this embodiment and embodiment 1 is that the MC@Ti3C2T x The addition amount of MXene corrosion-resistant, wear-resistant and self-repairing functional filler is 0.08 g, and the mass percentage in the phosphate binder is 0.2 wt.%. The rest of the preparation process is the same as that in Example 1 to obtain a corrosion-resistant, wear-resistant and self-repairing inorganic phosphate ceramic coating.

[0060] Example 4

[0061] The difference between this embodiment and embodiment 1 is that the MC@Ti3C2T x The addition amount of MXene corrosion-resistant, wear-resistant and self-repairing functional filler is 0.12 g, and the mass percentage in the phosphate binder is 0.3 wt.%. The rest of the preparation process is the same as that in Example 1 to obtain a corrosion-resistant, wear-resistant and self-repairing inorganic phosphate ceramic coating.

[0062] Example 5

[0063] The difference between this embodiment and embodiment 1 is that the MC@Ti3C2T x The addition amount of MXene corrosion-resistant, wear-resistant and self-repairing functional filler is 0.16 g, and the mass percentage in the phosphate binder is 0.4 wt.%. The rest of the preparation process is the same as that in Example 1 to obtain a corrosion-resistant, wear-resistant and self-repairing inorganic phosphate ceramic coating.

[0064] Example 6

[0065] The difference between this embodiment and embodiment 1 is that the MC@Ti3C2T x The addition amount of MXene corrosion-resistant, wear-resistant and self-repairing functional filler is 0.24 g, and the mass percentage in the phosphate binder is 0.6 wt.%. The rest of the preparation process is the same as that in Example 1 to obtain a corrosion-resistant, wear-resistant and self-repairing inorganic phosphate ceramic coating.

[0066] Comparative Example 1

[0067] The difference between this comparative example and Example 1 is that the MC@Ti3C2T x The addition amount of MXene corrosion-resistant, wear-resistant and self-repairing functional filler is 0 g, and the mass percentage in the phosphate binder is 0 wt.%. The rest of the preparation process is the same as that in Example 1 to obtain a corrosion-resistant, wear-resistant and self-repairing inorganic phosphate ceramic coating.

[0068] Comparative Example 2

[0069] The difference between this comparative example and Example 1 is that the corrosion-resistant and wear-resistant self-repairing functional filler added is adjusted to pure Ti3C2T with no microcapsules loaded on the surface. x The addition amount of MXene nanosheets was 0.2 g, and the mass percentage in the phosphate binder was 0.5 wt.%. The rest of the preparation process was the same as that in Example 1 to prepare a corrosion-resistant, wear-resistant, self-repairing inorganic phosphate ceramic coating.

[0070] Figure 3 This is the cross-sectional morphology of the corrosion-resistant, wear-resistant, self-repairing inorganic phosphate ceramic coating prepared in Example 1 of the present invention. Figure 4 This is the cross-sectional morphology of the inorganic phosphate ceramic coating prepared in Comparative Example 2 of the present invention. Figure 3 and Figure 4 It can be seen that the MC@Ti3C2T microcapsules loaded in situ x The interfacial bonding ability of MXene corrosion-resistant and wear-resistant self-repairing functional fillers in phosphate ceramic coatings is stronger than that of pure Ti3C2T x The compatibility of MXene nanosheets with phosphate ceramic coatings is poor. This is because the microcapsules are x The surface of MXene constructs a rough cross-scale structure, which greatly improves the x Dispersion of MXene nanosheets in phosphate binder and Ti3C2T x Enhanced mechanical interlocking between MXene and alumina ceramic aggregates.

[0071] The corrosion resistance and tribological performance tests were performed on the coatings prepared in Examples 1 to 6 and Comparative Examples 1 and 2. The test results are shown in Table 1.

[0072] Table 1 Comparison of coating properties prepared in Examples 1 to 6 and Comparative Examples 1 to 2

[0073]

[0074] It can be seen from Table 1 that the MC@Ti3C2T prepared by the present invention x MXene corrosion-resistant and wear-resistant self-repairing functional fillers can significantly increase the lowest frequency impedance value of the phosphate ceramic coating, especially when the addition amount is 0.5wt.%, the impedance value of the coating increases by two orders of magnitude, which means that the corrosion resistance of the coating is significantly improved. Compared with Comparative Examples 1 and 2, the coatings prepared in Examples 1-10 of the present invention all show excellent repair efficiency, significantly reduced friction coefficient, and greatly reduced wear rate. In addition, Figure 5 It can be clearly seen that the coating prepared in Example 1 of the present invention can well repair the artificial scratches on the coating surface after immersion. The above test results all show that the present invention has successfully prepared a corrosion-resistant and wear-resistant self-repairing inorganic phosphate ceramic coating, and MC@Ti3C2T x The optimal addition amount of MXene is 0.5 wt.%.

[0075] Example 7

[0076] The difference between this embodiment and embodiment 1 is that the few-layer Ti3C2T x The amount of MXene dispersion added was 0.5 g, i.e., the aqueous phase, oil phase and few-layer Ti3C2T x The mass ratio of the MXene dispersion was 45:15:0.5, and the rest of the preparation process was the same as in Example 1 to obtain a corrosion-resistant, wear-resistant, self-repairing inorganic phosphate ceramic coating.

[0077] Example 8

[0078] The difference between this embodiment and embodiment 1 is that the few-layer Ti3C2T x The amount of MXene dispersion added was 1 g, and the aqueous phase, oil phase and few-layer Ti3C2T x The mass ratio of the MXene dispersion was 45:15:1, and the rest of the preparation process was the same as in Example 1 to prepare a corrosion-resistant, wear-resistant, self-repairing inorganic phosphate ceramic coating.

[0079] The corrosion resistance and tribological properties of the coatings prepared in the above examples were tested and compared with those in Example 1. The results are shown in Table 2.

[0080] Table 2 Comparison of coating properties prepared in Examples 1, 7, and 8

[0081]

[0082] It can be seen from the above table that the adjustment of water phase, oil phase and few-layer Ti3C2T x The mass ratio of MXene dispersion has a significant effect on the coating. x The amount of MXene dispersion is small, resulting in the Ti3C2T x The dispersion of MXene in the system is not uniform enough. It cannot fully contact with other reactants, which makes the microcapsule coating effect worse, further leading to uneven stress distribution inside the coating and reduced corrosion and wear resistance in local areas. x Too much MXene dispersion will break the water phase, oil phase and Ti3C2T x The balance between MXene dispersions may cause defects in the microcapsule coating process. For example, it may cause agglomeration, Ti3C2T x MXene cannot be effectively coated. Therefore, according to the results in the above table, the water phase, oil phase and few-layer Ti3C2T x The best technical effect can be achieved when the mass ratio of MXene dispersion is 45:15:0.75.

[0083] Example 9

[0084] The difference between this embodiment and Example 1 is that 7.5 g of the repair agent 1H, 1H, 2H, 2H-perfluorodecyltriethoxysilane is mixed with 7.5 g of toluene solvent, that is, the mass ratio of the repair agent to the solvent is 1:1, and the rest of the preparation process is the same as that of Example 1 to obtain a corrosion-resistant and wear-resistant self-repairing inorganic phosphate ceramic coating.

[0085] Example 10

[0086] The difference between this embodiment and Example 1 is that 3.75g of the repair agent 1H,1H,2H,2H-perfluorodecyltriethoxysilane is mixed with 11.25g of toluene solvent, that is, the mass ratio of the repair agent to the solvent is 1:3, and the rest of the preparation process is the same as that of Example 1 to obtain a corrosion-resistant and wear-resistant self-repairing inorganic phosphate ceramic coating.

[0087] The corrosion resistance and tribological properties of the coatings prepared in the above examples were tested, and the results compared with those of Example 1 are shown in Table 3.

[0088] Table 3 Comparison of coating properties prepared in Examples 1, 9, and 10

[0089]

[0090] As can be seen from the table above, adjusting the mass ratio of the repair agent to the solvent has a significant effect on the coating. Excessive solvent may cause the viscosity of the system to decrease, making the repair agent and Ti3C2T xThe mixture of MXene and other components is not uniform enough. In the subsequent coating preparation process, this non-uniformity will continue to the final coating structure, thereby affecting the overall self-repairing ability and corrosion resistance of the coating. Too much solvent can also cause uneven solvent evaporation during coating curing, forming pores or micro-cracks. These defects will become the invasion channels of corrosive media, reducing the corrosion resistance of the coating. Too much repair agent can make the coating lack toughness and prone to cracking or peeling. Therefore, according to the results in the above table, the mass ratio of the repair agent to the solvent in the present application is 1:2, which can obtain the best technical effect.

[0091] The present application constructs a special multi-scale heterostructure by in-situ grafting of microcapsules embedding repair agent on the surface of Ti3C2T x MXene nanoplatelets can play a physical barrier and bridging role, blocking or inhibiting the diffusion path of corrosive media in the coating, thereby improving the corrosion resistance of the coating. In addition, after encountering external load or long-term immersion, Ti3C2T x MXene nanoplatelets can play a physical barrier and bridging role, blocking or inhibiting the diffusion path of corrosive media in the coating, thereby improving the corrosion resistance of the coating. In addition, after encountering external load or long-term immersion, Ti3C2T x The microcapsules on the surface of MXene nanoplatelets will rupture and release the internal embedded repair agent 1H, 1H, 2H, 2H-perfluorodecyltriethoxysilane. The repair agent undergoes cross-linking film-forming reaction when it meets water, forming a new physical barrier framework, so the coating exhibits excellent self-repairing ability.

[0092] The preparation process of the present application is simple, uses inorganic materials as the main component, has the advantages of no pollution, environmental friendliness, etc., and has low cost, which is more suitable for metal protection in natural ecological environment.

[0093] It should be noted that the above examples are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present application, which should be covered in the scope of the claims of the present application.

Claims

1. A method for preparing a functional filler, characterized in that: include, Mix urea, formaldehyde and water and stir, adjust the pH to 8-9, heat and stir in an oil bath to form a urea-formaldehyde prepolymer, and obtain an aqueous phase; Add the repair agent to the toluene solvent and stir evenly to obtain an oil phase; The oil phase and few-layer Ti3C2T x The MXene dispersion was added to the aqueous phase at the same time, the pH was adjusted to 2-3, heated in an oil bath, stirred, washed, centrifuged, and dried to obtain a functional filler, which was recorded as MC@Ti3C2T x MXene; Wherein, the water phase, oil phase and few-layer Ti3C2T x The mass ratio of MXene dispersion is 45:15:0.5~1.

2. The method for preparing the functional filler according to claim 1, wherein: The mass ratio of the urea, formaldehyde and water is 1:2:6; the mass ratio of the repair agent and toluene solvent is 1:1-3.

3. The method for preparing the functional filler according to claim 2, wherein: The repair agent includes 1H, 1H, 2H, 2H-perfluorodecyltriethoxysilane.

4. The method for preparing the functional filler according to claim 1, wherein: The oil bath has a temperature of 50 to 70° C. and a bath time of 1 to 2 hours.

5. A functional filler prepared by the preparation method according to any one of claims 1 to 4.

6. A corrosion-resistant, wear-resistant, self-repairing inorganic phosphate ceramic coating, characterized by: The coating comprises, based on the mass percentage of raw materials, 40-60% of ceramic aggregate, 35-45% of phosphate binder, 1-3% of curing agent, and 0.035-0.27% of the functional filler according to claim 5.

7. The corrosion-resistant, wear-resistant, self-repairing inorganic phosphate ceramic coating according to claim 6, characterized in that: The added amount of the functional filler is 0.1 to 0.6 wt.% of the mass of the phosphate binder.

8. The corrosion-resistant, wear-resistant, self-repairing inorganic phosphate ceramic coating according to claim 6, characterized in that: The ceramic aggregate includes one or more of aluminum oxide, silicon carbide, and zirconium oxide.

9. The corrosion-resistant, wear-resistant, self-repairing inorganic phosphate ceramic coating according to claim 6, characterized in that: The phosphate binder includes one or more of aluminum dihydrogen phosphate, magnesium phosphate, and chromium phosphate; the curing agent includes one or more of zinc oxide, magnesium oxide, and copper oxide.

10. The method for preparing the corrosion-resistant, wear-resistant, self-repairing inorganic phosphate ceramic coating according to any one of claims 6 to 9, characterized in that: include, The functional filler is added to the phosphate binder and dispersed evenly to obtain a mixed slurry; ceramic aggregate and a curing agent are added to the mixed slurry at the same time and stirred evenly to obtain a corrosion-resistant, wear-resistant and self-repairing inorganic phosphate ceramic coating; The corrosion-resistant, wear-resistant and self-repairing inorganic phosphate ceramic coating is scraped and then dried and cured in a stepwise manner to obtain the corrosion-resistant, wear-resistant and self-repairing inorganic phosphate ceramic coating.

Images