Multifunctional lubricating and anticorrosive material, its preparation method and application

Abstract

The present application belongs to the technical field of functional materials and lubricating anticorrosion coating, and particularly relates to a multifunctional lubricating anticorrosion material and a preparation method and application thereof. The present application significantly improves the dispersion stability of titanium carbide by gradient batch addition of reactants, and under high pressure conditions, uses acid-assisted deep peeling and fluorination method to prepare a structure-ordered graphene fluoride / titanium carbide two-dimensional heterojunction material in a solution. By using electrostatic interaction and van der Waals force, a nano metal organic framework loaded with corrosion inhibitor is controllably deposited on the two-dimensional nanosheet layer to construct a zero-dimensional and two-dimensional composite lubricating structure. The protective material has good photo-thermal response performance, lubricating performance and anticorrosion performance. The technology and method involved in the present application have important significance for the research and application of new lubricating anticorrosion materials.

Description

Technical Field

[0001] This invention belongs to the field of functional materials and lubricating and anti-corrosion coating technology, specifically relating to a multifunctional lubricating and anti-corrosion material, its preparation method, and its application. Background Technology

[0002] Corrosion and wear of metallic materials and equipment are among the major problems facing the world today. In industrial production, transportation, and energy development, metallic materials are frequently subjected to corrosion from various environmental factors, such as humid climates, chemical media, and high temperatures. These factors lead to corrosion and wear on the surface of metallic materials, resulting in serious consequences such as equipment damage, energy waste, and environmental pollution. Therefore, effective measures are needed to protect and extend their service life. To solve the problem of metal corrosion and wear, coating technology is commonly used to protect metal surfaces. Epoxy resin has good adhesion and chemical resistance. It can effectively bond to a variety of substrates to form a strong coating. However, traditional epoxy resin coatings suffer from poor lubrication, insufficient wear resistance, poor chemical corrosion resistance, and limited functionality.

[0003] Two-dimensional heterojunction materials are nanocomposite structures formed by combining two-dimensional nanosheets with different lattice parameters through a specific method. They possess a lower interlayer sliding energy barrier, resulting in a lower coefficient of friction compared to single two-dimensional nanosheets. Fluorinated graphene (FG) and two-dimensional transition metal carbides, nitrides, or carbonitrides (MXenes) all exhibit high mechanical strength and properties. Forming a heterojunction not only effectively maintains the excellent properties of both materials but also achieves a synergistic enhancement of lubrication performance. Furthermore, they mutually support each other, maintaining the integrity and stability of their two-dimensional layered structure, thus providing effective protection for the friction pair and exhibiting significant friction reduction and wear resistance. However, currently, there is no technology to fabricate FG / MXene heterojunctions.

[0004] On the other hand, nanoscale zero-dimensional lubricating materials can fill the gaps and uneven areas on the surfaces of friction pairs, serving both a polishing and repairing function, and reducing the contact area of ​​the friction pair surfaces, thereby lowering the coefficient of friction. Metal-organic frameworks (MOFs) are coordination polymers formed by metal ions or clusters and organic ligands. They possess advantages such as high porosity, low density, and large specific surface area. In particular, they also exhibit regular pores, adjustable pore sizes, diverse topologies, and customizability, allowing them to adsorb and store corrosion inhibitors, thus forming a protective layer to prevent corrosion and oxidation of metal surfaces and providing effective corrosion protection. However, according to the inventors' preliminary research, there are currently no technologies or methods for synergistically combining FG / MXene heterostructures with MOFs to enhance the lubrication and corrosion resistance of materials. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention aims to provide a novel, multifunctional lubricating and anti-corrosion coating. This coating overcomes the problems of high friction coefficient, poor long-term anti-corrosion effect, and limited functionality inherent in traditional lubricating and anti-corrosion coatings, providing superior protective performance for metallic materials and equipment. This invention innovatively designs and prepares a composite structure of FG / MXene heterojunction and MOFs, and uses it to reinforce epoxy resin. This significantly improves the corrosion resistance and lubrication performance of the protective material, providing new research ideas and technologies for the development and application of novel lubricating and anti-corrosion materials.

[0006] This invention aims to provide a composite lubricating and anti-corrosion material with stable structure, excellent friction reduction and wear resistance, and superior anti-corrosion performance, as well as its preparation method. It achieves synergistic enhancement of lubrication and anti-corrosion functions, providing more durable and reliable metal corrosion protection.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A multifunctional lubricating and anti-corrosion material, comprising the following components: epoxy resin; fluorinated graphene (FG) / MXene two-dimensional heterostructure; MOFs: ZIF-8, UiO-66, UiO-66-NH2, HKUST-1, MOF-5, MOF-74, NU-110, MIL-101 or MIL-53; corrosion inhibitor: benzotriazole, methylbenzotriazole or thiobenzothiazole; additives: solvent, defoamer, epoxy resin curing agent; wherein the solvent is deionized water. The preparation method of the above-mentioned epoxy resin multifunctional lubricating and anti-corrosion material includes the following steps: (1) Graphene oxide (GO) was dispersed in deionized water and treated with ultrasound to obtain GO colloid. Under ultrasound conditions, MXene was slowly added to the prepared GO colloid in batches and subjected to long-term ultrasound treatment. The synthesized GO / MXene mixture was transferred to a polytetrafluoroethylene reactor and hydrofluoric acid (HF) was slowly added in batches. After thorough mixing, the mixture was placed in an oven and heated to obtain FG / MXene heterojunction. The obtained FG / MXene heterojunction was centrifuged and washed until neutral, and stored in deionized water for later use to obtain an aqueous solution of the heterojunction. (2) MOFs and corrosion inhibitors are treated and dissolved in deionized water, and MOFs complex is formed by thorough stirring; the FG / MXene heterojunction aqueous solution obtained in step (1) is mixed with the MOFs complex to form FG / MXene@MOFs mixture; (3) The FG / MXene@MOFs mixture prepared in step 2, epoxy resin curing agent and defoamer are added to the epoxy resin in sequence; after treatment, an epoxy resin slurry of FG / MXene@MOFs mixture is obtained.

[0008] Preferably, in step (1), HF can be replaced by HCl plus LiF.

[0009] Preferably, in step (1), the GO / MXene mixture is transferred to a 50 mL polytetrafluoroethylene reactor, and the total volume of the GO / MXene mixture accounts for 1 / 2 to 2 / 3 of the volume of the polytetrafluoroethylene reactor.

[0010] Preferably, in step (1), the concentration of GO dispersed in water is 2~6 mg / mL, the mass ratio of GO to MXene is (1:1)~(5:3), and the volume ratio of the GO / MXene mixture to HF is (3:1)~(5:1).

[0011] Preferably, in step (1), MXene is added in doses of 1-4 mg each time, with an interval of 8-15 min, and the ultrasonic frequency is 40-60 Hz. Preferably, in step (1), the oven heating temperature is 70~180 ℃ and the heating reaction time is 8~20 h, so that the oxygen content in FG / MXene is 11.5~16.8% and the fluorine content is 13.6~14.2%.

[0012] Preferably, the concentration of the FG / MXene heterojunction aqueous solution in step (1) is 12~20 mg / mL.

[0013] Preferably, in step (2), the concentration of MOFs dispersed in water is 20~30 mg / mL, and the mass ratio of MOFs to corrosion inhibitor is (2:1)~(4:1).

[0014] Preferably, in step (2), the mass ratio of the FG / MXene heterojunction to the MOFs complex is (1:1) to (2:1).

[0015] Preferably, the stirring time in step (2) is 6-8 h.

[0016] Preferably, in step (3), the mass ratio of FG / MXene@MOFs mixture to epoxy resin is (2:3) to (1:1), the mass ratio of epoxy resin to epoxy resin curing agent is (6:1) to (10:1), and the mass ratio of epoxy resin to defoamer is (80:1) to (100:1).

[0017] The above-mentioned multifunctional lubricating and anti-corrosion materials can be used in the fields of lubrication and corrosion prevention.

[0018] Beneficial Effects: This invention employs a gradient-batch addition method of reactants. Gradual-batch addition of MXene significantly improves its dispersion stability, ensuring uniform dispersion in the solution and preventing aggregation or precipitation. Slow, dropwise addition of HF pre-impregnates the MXene, enhancing its acid etching and resulting in a more complete and structurally stable FG / MXene heterojunction. This gradient-batch addition method allows for the control of the content and distribution of different components in the material, thereby optimizing material properties and improving its structure.

[0019] This invention employs acid-assisted deep exfoliation and fluorination methods to prepare two-dimensional heterojunction materials. Acid-assisted deep exfoliation improves the dispersibility and stability of the FG / MXene heterojunction material. Acid-assisted deep exfoliation reduces the thickness of the MXene layer, which is beneficial for the bonding between MXene and FG, achieving synergistic performance enhancement. Acid-assisted deep exfoliation is simple to operate, low in cost, and suitable for industrial production and large-scale applications. Fluorination enhances the composite effect of MXene and FG, thereby forming a more ordered heterojunction material, fully leveraging the advantages of both FG and MXene, and improving the mechanical properties and chemical stability of the composite material.

[0020] This invention constructs a zero-dimensional and two-dimensional composite lubrication structure. MOFs loaded with corrosion inhibitors are controllably deposited onto two-dimensional nanosheets, achieving encapsulation and protection of the FG / MXene heterojunction. This avoids the layered stacking of the FG / MXene two-dimensional heterojunction and inhibits the aggregation of its own nanoparticles, enhancing its stability and durability. During friction, the two-dimensional material layers can peel off and roll against each other, exerting the zero-dimensional and two-dimensional lubrication mechanism, further reducing friction and wear. Furthermore, this method enables the controllable deposition of MOFs loaded with corrosion inhibitors, allowing the inhibitors to be uniformly and stably dispersed in the lubricating material and released during friction, thus inhibiting corrosion.

[0021] This invention provides a multifunctional lubricating and anti-corrosion material and its preparation method. The preparation method is simple and easy to implement, and yields high-quality composite materials. Through the effective composite of FG, MXene, and MOFs, the composition and structure of the coating system are optimized, resulting in a coating with a long service life and stability, providing excellent friction reduction and corrosion protection. It is suitable for applications in metal lubrication and corrosion prevention. This invention has broad application potential and can promote technological development and application innovation in related fields. Attached Figure Description

[0022] Figure 1 This is a comparison chart of the FG / MXene dispersion obtained according to the method of the present invention and that obtained in Comparative Example 1; Figure 2Transmission electron microscopy (TEM) image of the FG / MXene heterojunction obtained according to the method of the present invention; Figure 3 Transmission electron microscopy (TEM) image of FG / MXene@ZIF-8 obtained according to the method of this invention; Figure 4 XRD patterns of FG / MXene@ZIF-8, FG / MXene, and MXene obtained according to the method of this invention; Figure 5 The image shows the photothermal cycling curve of the FG / MXene heterojunction obtained according to the method of this invention. Figure 6 This is a comparison chart of the friction coefficients of different materials obtained by the method of the present invention after 30 minutes of friction. Figure 7 The friction coefficient diagram of the material obtained according to the method of the present invention after 120 min of friction; Figure 8 The impedance diagram is shown for the material obtained according to the method of the present invention. Detailed Implementation

[0023] The following description further sets forth specific details of the invention to provide a thorough understanding of it. The terminology used in this specification is for illustrative purposes only and is not intended to limit the scope of the invention.

[0024] Example 1 (1) Disperse 30 mg GO in 15 mL of deionized water and sonicate to obtain GO colloid; slowly add 4 mg MXene to the prepared GO colloid every 9 min for a total of 7 times and mix with sonication; transfer the synthesized GO / MXene into a polytetrafluoroethylene reactor, the total volume of the GO / MXene mixture is 1 / 2-2 / 3 of the volume of the polytetrafluoroethylene reactor, slowly add 6 mL HF dropwise, place in an oven and heat to 90 °C for 15 h to obtain FG / MXene heterojunction, centrifuge and wash until neutral, add deionized water to obtain 12 mg / mL FG / MXene heterojunction aqueous solution; (2) Take 0.06 g ZIF-8 and 0.015 g BTA, crush them, dissolve them in 2 mL of deionized water, stir for 8 h to ensure the reaction is complete, and form ZIF-8@BTA; take 1 g of FG / MXene heterojunction aqueous solution obtained in step (1) and 1 g ZIF-8@BTA, disperse them by ultrasonication and stir for 6 h to form FG / MXene@ZIF-8; (3) 2 g of FG / MXene@ZIF-8 prepared in step (2), 0.3 g of epoxy resin curing agent and 0.03 g of defoamer were added to 3 g of epoxy resin in sequence. After stirring and ultrasonic dispersion treatment, FG / MXene@ZIF-8 epoxy resin lubricating and anti-corrosion coating was obtained.

[0025] Example 2 (1) 15 mg GO was dispersed in 5 mL of deionized water and ultrasonically treated to obtain GO colloid. 3 mg MXene was slowly added to the prepared GO colloid every 10 min for a total of 7 times and ultrasonically mixed. The synthesized GO / MXene was transferred into a polytetrafluoroethylene reactor, with the total volume of the GO / MXene mixture occupying 1 / 2-2 / 3 of the volume of the polytetrafluoroethylene reactor. 3 mL of HF was slowly added dropwise and placed in an oven to be heated to 70 °C for 20 h to obtain FG / MXene heterojunction. The mixture was centrifuged and washed until neutral, and deionized water was added to obtain an aqueous solution of 12 mg / mL FG / MXene heterojunction. (2) Take 0.12 g ZIF-8 and 0.06 g TTA, crush them, dissolve them in 6 mL of deionized water, stir for 8 h to ensure the reaction is complete, and form ZIF-8@TTA; take 1.5 g of FG / MXene heterojunction aqueous solution obtained in step (1) and 1.5 g ZIF-8@TTA, disperse them by ultrasonication and stir for 6 h to form FG / MXene@ZIF-8; (3) 3 g of FG / MXene@ZIF-8 prepared in step (2), 0.5 g of epoxy resin curing agent and 0.036 g of defoamer were added to 3.6 g of epoxy resin in sequence. After stirring and ultrasonic dispersion treatment, FG / MXene@ZIF-8 epoxy resin lubricating and anti-corrosion coating was obtained.

[0026] Example 3 (1) 10 mg GO was dispersed in 5 mL of deionized water and ultrasonically treated to obtain GO colloid. 3 mg MXene was slowly added to the prepared GO colloid every 10 min for a total of 2 times and ultrasonically mixed. The synthesized GO / MXene was transferred into a polytetrafluoroethylene reactor, with the total volume of the GO / MXene mixture occupying 1 / 2-2 / 3 of the volume of the polytetrafluoroethylene reactor. 2 mL of HF was slowly added dropwise and placed in an oven to be heated to 80 °C for 18 h to obtain FG / MXene heterojunction. The mixture was centrifuged and washed until neutral, and deionized water was added to obtain an aqueous solution of 12 mg / mL FG / MXene heterojunction. (2) Take 0.03 g MOF-5 and 0.01 g MBT, crush them, dissolve them in 1 mL of deionized water, stir for 6 h to ensure the reaction is complete, and form MOF-5@ MBT; take 1 g of FG / MXene heterojunction aqueous solution obtained in step (1) and 1 g MOF-5@ MBT, disperse them by ultrasonication and stir for 6 h to form FG / MXene@MOF-5; (3) 2 g of FG / MXene@MOF-5 prepared in step (2), 0.3 g of epoxy resin curing agent and 0.02 g of defoamer were added to 2 g of epoxy resin in sequence. After stirring and ultrasonic dispersion treatment, FG / MXene@MOF-5 epoxy resin lubricating and anti-corrosion coating was obtained.

[0027] Example 4 (1) 20 mg GO was dispersed in 8 mL of deionized water and ultrasonically treated to obtain GO colloid. 2 mg MXene was slowly added to the prepared GO colloid every 15 min for a total of 7 times and ultrasonically mixed. The synthesized GO / MXene was transferred into a polytetrafluoroethylene reactor, with the total volume of the GO / MXene mixture occupying 1 / 2-2 / 3 of the volume of the polytetrafluoroethylene reactor. 6 mL of HF was slowly added dropwise and placed in an oven to be heated to 120℃ and reacted for 10 h to obtain FG / MXene heterojunction. The mixture was centrifuged and washed until neutral, and deionized water was added to obtain an aqueous solution of 12 mg / mL FG / MXene heterojunction. (2) Take 0.08 g UiO-66 and 0.02 g MBT, crush them, dissolve them in 2.5 mL of deionized water, stir for 8 h to ensure the reaction is complete, and form UiO-66@MBT; take 1.5 g of FG / MXene heterojunction aqueous solution obtained in step (1) and 1.5 g UiO-66@MBT, disperse them by ultrasonication and stir for 6 h to form FG / MXene@UiO-66 mixture; (3) 3 g of FG / MXene@UiO-66 prepared in step (2), 0.3 g of epoxy resin curing agent and 0.03 g of defoamer were added to 3 g of epoxy resin in sequence. After stirring and ultrasonic dispersion treatment, FG / MXene@UiO-66 epoxy resin lubricating and anti-corrosion coating was obtained.

[0028] Example 5 (1) 20 mg GO was dispersed in 5 mL of deionized water and GO colloid was obtained by sonication. 3 mg MXene was slowly added to the prepared GO colloid every 10 min for a total of 4 times and mixed by sonication. The synthesized GO / MXene was transferred into a polytetrafluoroethylene reactor. The total volume of the GO / MXene mixture was 1 / 2 to 2 / 3 of the volume of the polytetrafluoroethylene reactor. 4 mL of HF was slowly added dropwise. The reactor was placed in an oven and heated to 180 °C for 8 h to obtain FG / MXene heterojunction. The mixture was centrifuged and washed until neutral. Deionized water was added to obtain an aqueous solution of 12 mg / mL FG / MXene heterojunction. (2) Take 0.1 g UiO-66 and 0.25 g BTA, crush them, dissolve them in 4 mL of deionized water, stir for 8 h to ensure the reaction is complete, and form UiO-66@BTA; take 1 g of FG / MXene heterojunction aqueous solution obtained in step (1) and 1 g UiO-66@BTA, disperse them by ultrasonication and stir for 6 h to form FG / MXene@UiO-66 mixture; (3) 2 g of FG / MXene@UiO-66 prepared in step (2), 0.2 g of epoxy resin curing agent and 0.02 g of defoamer were added to 2 g of epoxy resin in sequence. After stirring and ultrasonic dispersion treatment, FG / MXene@UiO-66 epoxy resin lubricating and anti-corrosion coating was obtained.

[0029] Example 6 (1) 20 mg GO was dispersed in 10 mL of deionized water and ultrasonicated to obtain GO colloid. 3 mg MXene was slowly added to the prepared GO colloid every 10 min for a total of 6 times and ultrasonically mixed. The synthesized GO / MXene was transferred into a polytetrafluoroethylene reactor, with the total volume of the GO / MXene mixture occupying 1 / 2-2 / 3 of the volume of the polytetrafluoroethylene reactor. 4 mL of HF was slowly added dropwise and placed in an oven to be heated to 150 °C for 12 h to obtain FG / MXene heterojunction. The mixture was centrifuged and washed until neutral, and deionized water was added to obtain a 12 mg / mL FG / MXene heterojunction aqueous solution. (2) Take 0.06 g of MIL-53 and 0.015 g of TTA, crush them, dissolve them in 2 mL of deionized water, stir for 8 h to ensure the reaction is complete, and form MIL-53@TTA; take 1 g of FG / MXene heterojunction aqueous solution obtained in step (1) and 1 g of MIL-53@TTA, disperse them by ultrasonication and stir for 6 h to form FG / MXene@MIL-53 mixture; (3) 2 g of FG / MXene@MIL-53 prepared in step (2), 0.3 g of epoxy resin curing agent and 0.03 g of defoamer were added to 3 g of epoxy resin in sequence. After stirring and ultrasonic dispersion treatment, FG / MXene@MIL-53 epoxy resin lubricating and anti-corrosion coating was obtained.

[0030] Comparative Example 1 30 mg of GO was dispersed in 15 mL of deionized water and sonicated to obtain GO colloid. 28 mg of MXene was added to the prepared GO colloid in one go; the mixed GO / MXene was transferred to a polytetrafluoroethylene reactor, 6 mL of HF was added, and the mixture was heated to 90 °C in an oven for 15 h to obtain FG / MXene heterojunctions. The mixture was centrifuged and washed until neutral, and deionized water was added to obtain an aqueous solution of FG / MXene heterojunctions at a concentration of 12 mg / mL.

[0031] Comparative Example 2 20 mg of GO was dispersed in 10 mL of deionized water and sonicated to obtain GO colloid. 18 mg of MXene was added to the prepared GO colloid in one go. The mixed GO / MXene was transferred to a polytetrafluoroethylene reactor, 6 mL of HF was added, and the reactor was heated to 90 °C in an oven for 15 h to obtain FG / MXene heterojunction. The mixture was centrifuged and washed until neutral, and deionized water was added to obtain an aqueous solution of FG / MXene heterojunction with a concentration of 12 mg / mL.

[0032] Comparative Example 3 0.3 g of epoxy resin curing agent and 0.03 g of defoamer were added to 3 g of epoxy resin in sequence. After stirring and ultrasonic dispersion treatment, epoxy resin coating was obtained.

[0033] Comparative Example 4 0.4 g of epoxy resin curing agent and 0.03 g of defoamer were added to 4 g of epoxy resin in sequence. After stirring and ultrasonic dispersion, pure epoxy resin coating was obtained.

[0034] Comparative Example 5 5 mg MXene, 0.3 g epoxy resin curing agent and 0.03 g defoamer were added to 3 g epoxy resin in sequence. After stirring and ultrasonic dispersion, MXene-reinforced epoxy resin coating was obtained.

[0035] Performance testing 1. Observation of the dispersibility of FG / MXene heterojunctions prepared according to the method of the present invention Figure 1The diagram shows a comparison of the dispersibility of FG / MXene heterojunctions prepared according to the method of this invention and those obtained in Comparative Example 1 (left: prepared according to the method of this invention, right: prepared in Comparative Example 1). The FG / MXene heterojunctions prepared according to the method of this invention and those obtained in Comparative Example 1 were diluted to 0.3 mg / mL and ultrasonically dispersed at 40 Hz for 10 min. The results show that the FG / MXene heterojunction prepared by mixing GO and MXene in Comparative Example 1 at one time has poor dispersibility; while the FG / MXene heterojunction prepared by adding MXene in batches according to this invention has better dispersibility. This indicates that adding reactants in batches can significantly improve the dispersion stability of MXene, ensuring that MXene is uniformly dispersed in the solution and avoiding its aggregation or precipitation.

[0036] 2. Structural observation of FG / MXene heterojunction and FG / MXene@ZIF-8 prepared according to the method of the present invention Figure 2 The image shows a transmission electron microscope (TEM) image of the FG / MXene heterojunction obtained according to the method of the present invention; the results show that FG / MXene exhibits a typical thin sheet-like structure, rather than the original blocky and accordion-like structure of MXene.

[0037] Figure 3 The image shows a transmission electron microscope (TEM) image of FG / MXene@ZIF-8 obtained according to the method of the present invention; the results show that ZIF-8 nanoparticles are uniformly attached to the surface of FG / MXene.

[0038] 3. XRD patterns of FG / MXene@ZIF-8, FG / MXene, and MXene obtained according to the method of this invention. Figure 4 XRD patterns of FG / MXene@ZIF-8, FG / MXene, and MXene obtained according to the method of this invention are shown. The results show that for MXene, the peaks at 5°, 16.2°, 36.8°, 53°, and 60.9° correspond to the (002), (004), (104), (108), and (110) crystal planes of MXene. However, no other characteristic peaks were found after 37° in the XRD pattern of FG / MXene. This is because the "Al" layer in Ti3AlC2 was etched by acid, confirming that Ti3AlC2 is etched into Ti3C2T. x The transformation of MXene; the XRD patterns of FG / MXene@ZIF-8 and ZIF-8 are similar, which indicates that anchoring on the surface of FG / MXene heterojunction does not affect the crystal structure of ZIF-8.

[0039] 4. Determination of the photothermal cycling performance of the FG / MXene heterojunction obtained by the method of this invention. Detection method: The sample was irradiated with a near-infrared (NIR) laser with a wavelength of 808 nm, and the temperature was recorded every 30 seconds. At 1.5 W / cm²... 2 At a power density of 2 mg / mL, 8 irradiation / cooling cycles were performed on FG / MXene.

[0040] Figure 5 The photothermal cycling curves for the FG / MXene heterojunction prepared according to the method of the present invention are shown. The results indicate that diluting the FG / MXene aqueous solution to 2 mg / mL results in a near-infrared light power density of 1.5 W / cm². 2 The temperature can reach 64 °C within 480 s, indicating that FG / MXene has good photothermal conversion performance. Furthermore, the photothermal conversion capability of FG / MXene remains after 8 irradiation / cooling cycles, demonstrating good cycling stability.

[0041] 5. Determination of the tribological properties of FG / MXene@ZIF-8 obtained by the method of this invention. Test method: A Q235 steel block (2×2 cm) and a Si3N4 ball (6 mm in diameter) were used as a friction pair, and tribological properties were tested on a comprehensive material surface performance tester. The Si3N4 ball remained relatively stationary, while the Q235 steel block slid back and forth with an amplitude of 2 mm. The test frequency was 1 Hz, the test load was 1 N, and the temperature was 25 ℃. The coefficient of friction was automatically recorded by a computer system connected to the testing machine.

[0042] Figure 6 The graph shows a comparison of the friction coefficients of the FG / MXene@ZIF-8 reinforced epoxy resin coating, the epoxy resin coating, and the MXene-reinforced epoxy resin coating obtained according to the method of the present invention at 30 min. The results show that, under the conditions of a test frequency of 1 Hz and a test load of 1 N, the FG / MXene@ZIF-8 reinforced epoxy resin coating has an average friction coefficient as low as 0.03 compared to pure epoxy resin and MXene single-component lubricants, exhibiting the lowest friction coefficient.

[0043] Figure 7 The graph shows the friction coefficient of the FG / MXene@ZIF-8 reinforced epoxy resin coating obtained by the method of the present invention after 120 min. The results show that the friction coefficient of the FG / MXene@ZIF-8 reinforced epoxy resin coating remains at 0.03 after 120 min of long-term grinding, indicating that the coating has both a low friction coefficient and good wear resistance.

[0044] 6. Determination of the corrosion inhibition ability of the FG / MXene@MOFs-reinforced epoxy resin coating obtained by the method of the present invention. Detection Method: Electrochemical impedance spectroscopy (EIS) was used to detect the corrosion behavior of the coating in a three-electrode system consisting of a steel block coated with FG / MXene@ZIF-8 reinforced epoxy resin as the working electrode, a saturated calomel electrode (SCE) as the reference electrode, and a platinum plate (Pt) as the counter electrode. The electrolyte solution was a 3.5 wt% NaCl aqueous solution, and the workstation frequency range was 10 Hz. 2 -10 5 Hz.

[0045] The multifunctional epoxy resin lubricating and anti-corrosion coating prepared according to the method of the present invention was immersed in 3.5 wt% NaCl solution for 30 days, and its impedance diagram at different number of days was studied.

[0046] Figure 8 Impedance plots of the FG / MXene@ZIF-8 anti-corrosion coating obtained according to the method of this invention were obtained after immersion in a 3.5 wt% NaCl aqueous solution on days 1, 4, 21, and 30. The results show that at the start of immersion on day 1, the simulated impedance value of the FG / MXene@ZIF-8 coating is as high as 2.5 × 10⁻⁶. 8 The resistance Ω demonstrates the coating's excellent corrosion protection capability; even after immersion for 30 days, the simulated impedance value remained at 1.2 × 10⁻⁶. 7 Ω exhibits strong corrosion inhibition capabilities.

[0047] This invention prepares a coating with excellent lubrication and corrosion protection properties by introducing FG / MXene composite material and MOFs into an epoxy resin matrix. The coating has both a low coefficient of friction and good wear resistance, as well as excellent corrosion resistance, and can be widely used in the manufacture of equipment and metal products in many fields, providing an efficient lubrication and corrosion protection solution.

[0048] The above embodiments are merely illustrative of the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made based on the essence of the content of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A multifunctional lubricating and anti-corrosion material, characterized in that, The anti-corrosion material includes the following components: epoxy resin; FG / MXene two-dimensional heterojunction; MOFs: ZIF-8, UiO-66, UiO-66-NH2, HKUST-1, MOF-5, MOF-74, NU-110, MIL-101 or MIL-53; Corrosion inhibitor: benzotriazole, methylbenzotriazole or thiobenzothiazole; Additives: solvent, defoamer, epoxy resin curing agent; the solvent is deionized water; The multifunctional lubricating and anti-corrosion material is prepared through the following steps: (1) Disperse GO in deionized water to prepare a dispersion with a concentration of 2~6 mg / mL. Control the mass ratio of GO to MXene to be (1:1)~(5:3). Add MXene to the GO dispersion in multiple portions, each time 1~4 mg, with an interval of 8~15 min between adjacent additions. Perform ultrasonic mixing to obtain a GO / MXene mixture. Transfer the GO / MXene mixture to a polytetrafluoroethylene reactor. Add HF dropwise at a volume ratio of GO / MXene mixture to HF of (3:1)~(5:1). After mixing, perform a heating reaction to obtain an FG / MXene heterojunction aqueous solution. (2) Dissolve MOFs and corrosion inhibitors in deionized water and stir to obtain MOFs complex; (3) The FG / MXene heterojunction aqueous solution obtained in step (1) and the MOFs complex obtained in step (2) are mixed and stirred to form an FG / MXene@MOFs mixture; (4) The FG / MXene@MOFs mixture prepared in step (3), epoxy resin curing agent and defoamer are added to epoxy resin in sequence to obtain the multifunctional lubricating and anti-corrosion material.

2. The anti-corrosion material according to claim 1, characterized in that, In step (1), the GO / MXene mixture is transferred to a polytetrafluoroethylene reactor, wherein the total volume of the GO / MXene mixture occupies 1 / 2 to 2 / 3 of the volume of the polytetrafluoroethylene reactor.

3. The anti-corrosion material according to claim 1, characterized in that, In step (1), the frequency of the ultrasonic mixing is 40~60 Hz.

4. The anti-corrosion material according to claim 1, characterized in that, In step (1), the heating reaction is carried out at a temperature of 70~180 ℃ for 8~20 h. After the heating reaction, the reaction product needs to be centrifuged and washed until neutral to obtain a heterojunction aqueous solution with a concentration of 12~20 mg / mL.

5. The anti-corrosion material according to claim 1, characterized in that, In step (2), the concentration of the MOFs dissolved in deionized water is 20~30 mg / mL; The mass ratio of MOFs to corrosion inhibitor is (2:1) to (4:1).

6. The anti-corrosion material according to claim 1, characterized in that, In step (3), the mass ratio of the FG / MXene heterojunction to the MOFs complex is (1:1) to (2:1). The stirring time is 6-8 hours.

7. The anti-corrosion material according to claim 1, characterized in that, In step (2), the mass ratio of the FG / MXene@MOFs mixture to the epoxy resin is (2:3) to (1:1); the mass ratio of the epoxy resin to the epoxy resin curing agent is (6:1) to (10:1); and the mass ratio of the epoxy resin to the defoamer is (80:1) to (100:1).

8. The application of the multifunctional lubricating and anti-corrosion material according to claim 1, characterized in that, The multifunctional lubricating and anti-corrosion material is used in the fields of lubrication and corrosion prevention.

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