One-component high-performance polyurea coating and preparation method thereof

Abstract

The application belongs to the technical field of polyurea coating and specifically relates to a single-component high-performance polyurea coating and a preparation method thereof.The single-component high-performance polyurea coating comprises the following raw materials in parts by weight: diisocyanate 60-100 parts, diluent 30-50 parts, polyether polyol 100-140 parts, leveling agent 0.3-0.5 parts, defoaming agent 0.6-1 part, silane coupling agent 30-50 parts, chain extender 30-35 parts, catalyst 3-5 parts, europium-doped molybdenum sulfide coated with tin phytate 10-20 parts, and Cu3P@ZIF-7 5-15 parts.In the application, the europium-doped molybdenum sulfide coated with tin phytate and Cu3P@ZIF-7 are added, the interaction of the above components is utilized, the flame retardation and mechanical properties of the polyurea coating are promoted, the performance is excellent, and the application range is wide.

Description

Technical Field

[0001] This invention belongs to the field of polyurea coating technology. More specifically, it relates to a single-component high-performance polyurea coating and its preparation method. Background Technology

[0002] Polyurea elastomers are widely used in defense and civilian fields due to their excellent mechanical properties, water resistance, and corrosion resistance. Polyurea elastomers are synthesized through a stepwise polymerization reaction of polyetheramines and isocyanates, with relatively mild synthesis conditions and easy-to-control operation. Since polyurea elastomers are flammable materials, flame-retardant modification of polyurea is crucial.

[0003] CN118325434A discloses a sprayable flame-retardant polyurea coating, comprising component A and component B. Component A is a semi-prepolymer obtained by reacting a first polyether polyol with an aromatic isocyanate. Component B, by mass parts, comprises: 30-50 parts of a second polyether polyol, 20-30 parts of an amine chain extender, 0.2-0.5 parts of a coupling agent, 0.2-0.5 parts of a catalyst, and 35-37 parts of a composite flame retardant. The composite flame retardant, by mass parts, comprises 34-35 parts of a first flame retardant and 1-2 parts of a second flame retardant. The first flame retardant is triphenyl phosphate-coated aluminum hypophosphite, and the second flame retardant is zeolite imidazole skeleton-8 modified MXene. This invention effectively improves the interfacial interaction between the flame retardant and the polyurea (PUA), resulting in a significant improvement in the mechanical properties of the flame-retardant coating.

[0004] CN111171687A discloses a flame-retardant polyurea coating comprising component A and component B. The volume ratio of component A to component B is (2-2.5):1. Component A is composed of oligomers formed by the reaction of aromatic isocyanate and polyol. The molar ratio of aromatic isocyanate to polyol is (2-3):1. Component B comprises the following components by mass percentage: 20-30% amino resin, 20-30% chain extender, 0.5-2% leveling agent, 0.5-1% defoamer, 5-20% flame retardant, 2-5% UV shielding agent, and 12-30% filler. The flame-retardant polyurea coating of this invention possesses excellent mechanical strength, flame retardant properties, tensile strength, high toughness, chemical resistance, and excellent electrical insulation properties. In use, mixing component A and component B results in a rapid reaction rate, with a gel time within 10 seconds, enabling vertical spraying without dripping and significantly improving construction efficiency.

[0005] CN113480925A discloses a method for manufacturing a high-performance solvent-free flame-retardant polyurea coating. The method is characterized by the following steps: First, component A is dehydrated and prepolymerized into a prepolymer. Second, component B (liquid amine chain extender, polyaspartic acid ester, 2,5-dichloro-p-phenylenediamine) and component C (anti-settling agent) are mixed in a mixing tank to form a homogeneous solution. Then, component C (pigments, flame-retardant fillers, and additives) is added. Under a certain stirring speed, the mixture forms component D. Finally, the prepolymer of component A is mixed with the component D mixture, with the main components combined at a ratio of 1:1 mol / mol to form the polyurea coating, thus completing the manufacturing of the flame-retardant polyurea coating. This coating possesses excellent mechanical and performance properties, is simple to operate, and has a wide range of applications. It is suitable for flame-retardant protection of interior walls of buildings, vehicles, aircraft, and ships. The coating is suitable for manual application and / or spraying.

[0006] CN107916056A discloses a halogen-free flame retardant and a flame-retardant polyurea elastomer coating. The halogen-free flame retardant comprises organic aluminum hypophosphite, polytetrafluoroethylene, ammonium polyphosphate, and dipentaerythritol. The flame retardant of this invention is a compound of organic aluminum hypophosphite, polytetrafluoroethylene powder, ammonium polyphosphate, and dipentaerythritol. After combustion, it produces a large amount of carbides, forming a carbonized layer that prevents the substrate from continuing to burn. It also prevents melting and dripping, and features good thermal stability and low smoke production.

[0007] As can be seen from the above, the flame retardant properties of polyurea coatings can be improved by adding flame retardant materials during the preparation of polyurea. This invention provides a single-component high-performance polyurea coating with excellent flame retardant and mechanical properties. Summary of the Invention

[0008] The technical problem to be solved by this invention is to overcome the defects and deficiencies of the existing technology and provide a single-component high-performance polyurea coating and its preparation method. By weight, it includes the following raw materials: 60-100 parts diisocyanate, 30-50 parts diluent, 100-140 parts polyether polyol, 0.3-0.5 parts leveling agent, 0.6-1 part defoamer, 30-50 parts silane coupling agent, 30-35 parts chain extender, 3-5 parts catalyst, 10-20 parts phytate-coated europium-doped molybdenum sulfide, and 5-15 parts Cu3P@ZIF-7. In this invention, by adding phytate-coated europium-doped molybdenum sulfide and Cu3P@ZIF-7, the interaction of the above components significantly improves the flame retardancy and mechanical properties of the polyurea coating, resulting in excellent performance and a wide range of applications.

[0009] The purpose of this invention is to provide a single-component high-performance polyurea coating.

[0010] Another objective of this invention is to provide a method for preparing a single-component high-performance polyurea coating.

[0011] The above-mentioned objective of this invention is achieved through the following technical solution:

[0012] A single-component high-performance polyurea coating, comprising the following raw materials by weight:

[0013] 60-100 parts diisocyanate, 30-50 parts diluent, 100-140 parts polyether polyol, 0.3-0.5 parts leveling agent, 0.6-1 part defoamer, 30-50 parts silane coupling agent, 30-35 parts chain extender, 3-5 parts catalyst, 10-20 parts europium-doped molybdenum sulfide coated with tin phytate; 5-15 parts Cu3P@ZIF-7.

[0014] Preferably, the diisocyanate is at least one selected from isophorone diisocyanate (IPDI), diphenylmethane diisocyanate (MDI), and dicyclohexylmethane diisocyanate (HMDI); the diluent is selected from at least one selected from isopropanol, acetone, and ethanol; and the polyether polyol is polyether polyol 635, polyether polyol 450, or polyether polyol 4110.

[0015] Preferably, the leveling agent is polydimethylsiloxane; the defoamer is selected from JX883 silicone defoamer; the silane coupling agent is at least one of KH-550, KH-560, and KH-570; the chain extender is at least one of diethyltoluenediamine, dimethylthiotoluenediamine, and diethyltoluenediamine; and the catalyst is dibutyltin dilaurate.

[0016] In this invention, a preferred technical solution is provided, wherein the method for preparing the phytate-coated europium-doped molybdenum sulfide includes the following steps:

[0017] (1) Dissolve molybdenum source, europium source and thiourea in deionized water and stir until homogeneous to obtain a mixed solution; then carry out hydrothermal reaction, wash, and vacuum dry at 60-90℃ to constant weight to obtain europium-doped MoS2;

[0018] (2) Add the europium-doped MoS2, phytic acid and tin source obtained in step (1) to deionized water, ultrasonically disperse for 20-40 min, then react at 70-90℃ for 2-4 h, cool to room temperature, filter, wash, and vacuum dry at 60-90℃ to constant weight to obtain europium-doped molybdenum sulfide coated with phytic acid tin.

[0019] Preferably, in step (1), the europium source is at least one of europium nitrate, europium chloride, and europium acetate; the molybdenum source includes at least one of sodium molybdate, potassium molybdate, or ammonium molybdate; the molar ratio of the molybdenum source, europium source, and thiourea is 1:0.03~0.07:3~7, and the hydrothermal reaction conditions are 8~16 h at 180~220 °C.

[0020] Preferably, in step (2), the tin source is at least one of tin tetrachloride, tin sulfate, and tin acetate; the ratio of europium-doped MoS2, phytic acid, and tin source is 10g: 1mmol: 3~5mmol.

[0021] In a further preferred embodiment of the present invention, the preparation method of Cu3P@ZIF-7 includes the following steps:

[0022] (1) Dissolve copper salt, yellow phosphorus and surfactant in a certain amount of deionized water in sequence, stir to mix evenly to obtain a mixed solution; then hydrothermally react at 180~240℃ for 4~8h, cool to room temperature, filter, wash, and then dry at 70~90℃ for 10~16h to obtain Cu3P;

[0023] (2) Disperse the Cu3P, benzimidazole and zinc source obtained in step (1) into a mixed solution of methanol and DMF, then stir the reaction at 40~60℃ for 8~12h, cool to room temperature, wash, and then dry at 60~80℃ to constant weight to obtain Cu3P@ZIF-7.

[0024] Preferably, in step (1), the molar ratio of the copper salt to the yellow phosphorus is 1:3~5, and the ratio of the amount of copper salt to the amount of surfactant added is 1 mmol: 0.1~0.3 g; the copper salt is one of copper nitrate, copper acetate or copper chloride; the surfactant is selected from sodium dioctyl succinate sulfonate and / or hexadecyltrimethylammonium bromide.

[0025] Preferably, in step (2), the volume ratio of methanol to DMF is 1:1; the ratio of Cu3P, benzimidazole and zinc source is 10g:7mmol:54~58mmol; and the zinc source is at least one of zinc nitrate, zinc chloride and zinc acetate.

[0026] The preparation method of the single-component high-performance polyurea coating described above includes the following steps:

[0027] (1) Mix polyether polyol, leveling agent, defoamer and chain extender, stir and heat to 100-110℃, and dehydrate under vacuum for 1-2 hours;

[0028] (2) Under inert gas protection, the system in step (1) is cooled to 60-80℃, phytate-coated europium-doped molybdenum sulfide, Cu3P@ZIF-7, silane coupling agent and diluent are added, and the mixture is stirred for 1-3 hours. Then, diisocyanate and catalyst are added, and the mixture is stirred for another 3-5 hours. The mixture is then discharged to obtain a single-component high-performance polyurea coating.

[0029] The present invention has the following beneficial effects:

[0030] Molybdenum disulfide, a compound with a layered structure, exhibits good thermal stability and low thermal conductivity. It provides protection through a layered barrier effect during the pyrolysis and combustion of polymer materials. Coating with tin phytate not only improves the compatibility of molybdenum disulfide in polyurea systems, thus effectively improving the flame retardant properties of polyurea coatings, but also enhances their mechanical properties. The addition of copper phosphide promotes the formation of a dense and uniform carbon layer, effectively contributing to flame retardancy. Furthermore, its combination with ZIF-7 further improves the flame retardancy and mechanical properties of the polyurea coating. Moreover, the prepared polyurea coating shows excellent application prospects. Detailed Implementation

[0031] The present invention will be further illustrated below with reference to specific embodiments, but the embodiments do not limit the present invention in any way. Unless otherwise specified, the reagents, methods, and equipment used in the present invention are conventional reagents, methods, and equipment in this technical field.

[0032] Unless otherwise specified, all reagents and materials used in the following examples are commercially available.

[0033] Example 1

[0034] A single-component high-performance polyurea coating, comprising the following raw materials by weight:

[0035] 80 parts diisocyanate, 40 parts diluent, 120 parts polyether polyol, 0.4 parts leveling agent, 0.8 parts defoamer, 40 parts silane coupling agent, 32 parts chain extender, 4 parts catalyst, 15 parts europium-doped molybdenum sulfide coated with tin phytate; 10 parts Cu3P@ZIF-7;

[0036] The diisocyanate is diphenylmethane diisocyanate (MDI);

[0037] The diluent is acetone;

[0038] The polyether polyol is polyether polyol 450;

[0039] The leveling agent is polydimethylsiloxane;

[0040] The defoamer is selected from JX883 silicone defoamer;

[0041] The silane coupling agent is KH-560;

[0042] The chain extender is dimethylthiotoluenediamine;

[0043] The catalyst is dibutyltin dilaurate;

[0044] The preparation method of phytate-coated europium-doped molybdenum sulfide includes the following steps:

[0045] (1) Dissolve 1 mol ammonium molybdate, 0.05 mol europium nitrate and 5 mol thiourea in 250 mL of deionized water and stir until homogeneous to obtain a mixed solution; then carry out a hydrothermal reaction at 200 °C for 12 h, wash and dry under vacuum at 80 °C to constant weight to obtain europium-doped MoS2;

[0046] (2) Add 10g of europium-doped MoS2 obtained in step (1), 1mmol of phytic acid and 4mmol of tin tetrachloride to 150mL of deionized water, sonicate for 30min, react at 80℃ for 3h, cool to room temperature, filter, wash, and vacuum dry at 80℃ to constant weight to obtain europium-doped molybdenum sulfide coated with tin phytate.

[0047] The preparation method of Cu3P@ZIF-7 includes the following steps:

[0048] (1) Dissolve 1 mmol copper nitrate, 4 mmol yellow phosphorus and 0.2 g sodium dioctyl succinate in 150 mL of deionized water and stir until they are mixed evenly to obtain a mixed solution; then react hydrothermally at 200 °C for 6 h, cool to room temperature, filter, wash, and then dry at 80 °C for 14 h to obtain Cu3P;

[0049] (2) Disperse 10g of Cu3P obtained in step (1), 7mmol of benzimidazole and 56mmol of zinc nitrate into a mixed solution of 300mL of methanol and DMF, wherein the volume ratio of methanol to DMF is 1:1; then stir the reaction at 50℃ for 10h, cool to room temperature, wash, and then dry at 70℃ to constant weight to obtain Cu3P@ZIF-7.

[0050] A method for preparing a single-component high-performance polyurea coating, the method comprising the following steps:

[0051] (1) Mix polyether polyol, leveling agent, defoamer and chain extender, stir and heat to 105°C, and dehydrate under vacuum for 1.5h;

[0052] (2) Under inert gas protection, the system in step (1) was cooled to 70°C, and phytate-coated europium-doped molybdenum sulfide, Cu3P@ZIF-7, silane coupling agent and diluent were added. The mixture was stirred for 2 hours, and then diisocyanate and catalyst were added. The mixture was stirred for another 4 hours and then discharged to obtain a single-component high-performance polyurea coating.

[0053] Example 2

[0054] A single-component high-performance polyurea coating, comprising the following raw materials by weight:

[0055] 100 parts diisocyanate, 30 parts diluent, 140 parts polyether polyol, 0.3 parts leveling agent, 1 part defoamer, 30 parts silane coupling agent, 35 parts chain extender, 3 parts catalyst, 20 parts europium-doped molybdenum sulfide coated with tin phytate; 75 parts Cu3P@ZIF-.

[0056] The diisocyanate is isophorone diisocyanate (IPDI);

[0057] The diluent is isopropanol;

[0058] The polyether polyol is polyether polyol 635;

[0059] The leveling agent is polydimethylsiloxane;

[0060] The defoamer is selected from JX883 silicone defoamer;

[0061] The silane coupling agent is KH-550;

[0062] The chain extender is diethyltoluenediamine;

[0063] The catalyst is dibutyltin dilaurate;

[0064] The preparation method of phytate-coated europium-doped molybdenum sulfide includes the following steps:

[0065] (1) Dissolve 1 mol potassium molybdate, 0.07 mol europium chloride and 3 mol thiourea in 250 mL of deionized water and stir until homogeneous to obtain a mixed solution; then carry out a hydrothermal reaction at 220 °C for 8 h, wash and dry under vacuum at 90 °C to constant weight to obtain europium-doped MoS2;

[0066] (2) Add 10g of europium-doped MoS2 obtained in step (1), 1mmol of phytic acid and 5mmol of tin sulfate to 150mL of deionized water, sonicate for 40min, react at 90℃ for 2h, cool to room temperature, filter, wash, and vacuum dry at 90℃ to constant weight to obtain europium-doped molybdenum sulfide coated with tin phytate.

[0067] The preparation method of Cu3P@ZIF-7 includes the following steps:

[0068] (1) Dissolve 1 mmol of copper acetate, 5 mmol of yellow phosphorus and 0.3 g of hexadecyltrimethylammonium bromide in 150 mL of deionized water and stir until they are mixed evenly to obtain a mixed solution; then react hydrothermally at 240 °C for 4 h, cool to room temperature, filter, wash, and then dry at 90 °C for 10 h to obtain Cu3P;

[0069] (2) Disperse 10g of Cu3P obtained in step (1), 7mmol of benzimidazole and 58mmol of zinc chloride into a mixed solution of 300mL of methanol and DMF, wherein the volume ratio of methanol to DMF is 1:1; then stir the reaction at 60℃ for 8h, cool to room temperature, wash, and then dry at 80℃ to constant weight to obtain Cu3P@ZIF-7.

[0070] The preparation method of a single-component high-performance polyurea coating is the same as in Example 1.

[0071] Example 3

[0072] A single-component high-performance polyurea coating, comprising the following raw materials by weight:

[0073] 60 parts diisocyanate, 50 parts diluent, 100 parts polyether polyol, 0.5 parts leveling agent, 0.6 parts defoamer, 50 parts silane coupling agent, 30 parts chain extender, 5 parts catalyst, 10 parts europium-doped molybdenum sulfide coated with tin phytate; 15 parts Cu3P@ZIF-7.

[0074] The diisocyanate is dicyclohexylmethane diisocyanate (HMDI);

[0075] The diluent is ethanol;

[0076] The polyether polyol is polyether polyol 4110;

[0077] The leveling agent is polydimethylsiloxane;

[0078] The defoamer is selected from JX883 silicone defoamer;

[0079] The silane coupling agent is KH-570;

[0080] The chain extender is diethyltoluenediamine;

[0081] The catalyst is dibutyltin dilaurate;

[0082] The preparation method of phytate-coated europium-doped molybdenum sulfide includes the following steps:

[0083] (1) Dissolve 1 mol sodium molybdate, 0.03 mol europium acetate and 7 mol thiourea in 250 mL of deionized water and stir until homogeneous to obtain a mixed solution; then carry out a hydrothermal reaction at 180 °C for 16 h, wash and dry under vacuum at 60 °C to constant weight to obtain europium-doped MoS2;

[0084] (2) Add 10g of europium-doped MoS2 obtained in step (1), 1mmol of phytic acid and 3mmol of tin acetate to 150mL of deionized water, sonicate for 20min, react at 70℃ for 4h, cool to room temperature, filter, wash, and vacuum dry at 60℃ to constant weight to obtain europium-doped molybdenum sulfide coated with tin acetate.

[0085] The preparation method of Cu3P@ZIF-7 includes the following steps:

[0086] (1) Dissolve 1 mmol of copper chloride, 3 mmol of yellow phosphorus and 0.1 g of sodium dioctyl succinate in 150 mL of deionized water and stir until they are mixed evenly to obtain a mixed solution; then react hydrothermally at 180 °C for 8 h, cool to room temperature, filter, wash, and then dry at 70 °C for 16 h to obtain Cu3P;

[0087] (2) Disperse 10g of Cu3P obtained in step (1), 7mmol of benzimidazole and 54mmol of zinc acetate into a mixed solution of 300mL of methanol and DMF, wherein the volume ratio of methanol to DMF is 1:1; then stir the reaction at 40℃ for 12h, cool to room temperature, wash, and then dry at 60℃ to constant weight to obtain Cu3P@ZIF-7.

[0088] The preparation method of a single-component high-performance polyurea coating is the same as in Example 1.

[0089] Comparative Example 1

[0090] Comparative Example 1 is essentially the same as Example 1 except for the difference in the amount of tin-coated molybdenum sulfide used instead of tin-coated europium-doped molybdenum sulfide. The preparation method of the tin-coated molybdenum sulfide includes the following steps:

[0091] (1) Dissolve 1.05 mol ammonium molybdate and 5 mol thiourea in 250 mL of deionized water and stir until homogeneous to obtain a mixture; then carry out a hydrothermal reaction at 200 °C for 12 h, wash and dry under vacuum at 80 °C to constant weight to obtain MoS2;

[0092] (2) Add 10g of MoS2 obtained in step (1), 1mmol of phytic acid and 4mmol of tin tetrachloride to 150mL of deionized water, sonicate for 30min, react at 80℃ for 3h, cool to room temperature, filter, wash, and vacuum dry at 80℃ to constant weight to obtain phytic acid-coated molybdenum sulfide.

[0093] Comparative Example 2

[0094] Comparative Example 2 is essentially the same as Example 1 except for the following differences: an equal amount of europium-doped molybdenum sulfide is used instead of tin-coated europium-doped molybdenum sulfide. The preparation method of the europium-doped molybdenum sulfide includes the following steps:

[0095] 1 mol ammonium molybdate, 0.05 mol europium nitrate and 5 mol thiourea were dissolved in 250 mL of deionized water and stirred until homogeneous to obtain a mixed solution. Then, a hydrothermal reaction was carried out at 200 °C for 12 h. After washing, the solution was dried under vacuum at 80 °C to constant weight to obtain europium-doped MoS2.

[0096] Comparative Example 3

[0097] Comparative Example 3 is essentially the same as Example 1 except for the following differences: Cu3P is replaced with an equal amount of Cu3P@ZIF-7, and the preparation method of Cu3P includes the following steps:

[0098] 1 mmol copper nitrate, 4 mmol yellow phosphorus and 0.2 g sodium dioctyl succinate were dissolved in 150 mL deionized water and stirred until they were mixed evenly to obtain a mixed solution. Then, the solution was hydrothermally reacted at 200 °C for 6 h, cooled to room temperature, filtered, washed and then dried at 80 °C for 14 h to obtain Cu3P.

[0099] Comparative Example 4

[0100] Comparative Example 4 is basically the same as Example 1 except for the difference that Cu3P@ZIF-7 is replaced by europium-doped molybdenum sulfide coated with tin phytate.

[0101] Comparative Example 5

[0102] Comparative Example 5 is basically the same as Example 1 except for the difference that is: 8 parts of europium-doped molybdenum sulfide coated with tin phytate.

[0103] Comparative Example 6

[0104] Comparative Example 6 is basically the same as Example 1 except for the difference that 22 parts of europium-doped molybdenum sulfide coated with tin phytate are used.

[0105] The performance of Examples 1-3 and Comparative Examples 1-6 was tested, and the specific test results are shown in Table 1.

[0106] Tensile strength: Tested according to HG / T 3831—2006;

[0107] Limiting Oxygen Index (LOI): Performed according to ASTM D2863 standard.

[0108] Table 1:

[0109] Tensile strength (MPa) Limiting Oxygen Index (LOI) / % Example 1 19.4 40.5 Example 2 18.7 39.6 Example 3 19.1 40.2 Comparative Example 1 39.2 Comparative Example 2 17.8 38.4 Comparative Example 3 18.1 38.6 Comparative Example 4 17.2 36.7 Comparative Example 5 18.6 39.1 Comparative Example 6 18.3 38.9

[0110] As shown in Table 1, the single-component high-performance polyurea coating prepared by this invention exhibits excellent tensile strength and flame retardant properties, with a maximum tensile strength of 19.4 MPa and a maximum limiting oxygen index of 40.5%. Furthermore, a comparison between Example 1 and Comparative Examples 1-6 demonstrates that the components selected during the preparation process of this invention have a synergistic effect, jointly promoting the improvement of the polyurea coating's performance and giving it excellent application prospects.

[0111] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. A single-component high-performance polyurea coating, characterized in that: By weight, it includes the following ingredients: 60-100 parts diisocyanate, 30-50 parts diluent, 100-140 parts polyether polyol, 0.3-0.5 parts leveling agent, 0.6-1 part defoamer, 30-50 parts silane coupling agent, 30-35 parts chain extender, 3-5 parts catalyst, 10-20 parts europium-doped molybdenum sulfide coated with tin phytate; 5-15 parts Cu3P@ZIF-7; The method for preparing the phytate-coated europium-doped molybdenum sulfide includes the following steps: (1) Dissolve molybdenum source, europium source and thiourea in deionized water and stir until homogeneous to obtain a mixed solution; then carry out hydrothermal reaction, wash, and vacuum dry at 60-90℃ to constant weight to obtain europium-doped MoS2; (2) Add the europium-doped MoS2, phytic acid and tin source obtained in step (1) to deionized water, ultrasonically disperse for 20-40 min, then react at 70-90℃ for 2-4 h, cool to room temperature, filter, wash, and vacuum dry at 60-90℃ to constant weight to obtain europium-doped molybdenum sulfide coated with phytic acid. The preparation method of Cu3P@ZIF-7 includes the following steps: (1) Dissolve copper salt, yellow phosphorus and surfactant in a certain amount of deionized water in sequence, stir to mix evenly to obtain a mixed solution; then hydrothermally react at 180~240℃ for 4~8h, cool to room temperature, filter, wash, and then dry at 70~90℃ for 10~16h to obtain Cu3P; (2) Disperse the Cu3P, benzimidazole and zinc source obtained in step (1) into a mixed solution of methanol and DMF, then stir the reaction at 40~60℃ for 8~12h, cool to room temperature, wash, and then dry at 60~80℃ to constant weight to obtain Cu3P@ZIF-7.

2. The single-component high-performance polyurea coating according to claim 1, characterized in that: The diisocyanate is at least one of isophorone diisocyanate (IPDI), diphenylmethane diisocyanate (MDI), and dicyclohexylmethane diisocyanate (HMDI); the diluent is at least one of isopropanol, acetone, and ethanol; and the polyether polyol is polyether polyol 635, polyether polyol 450, or polyether polyol 4110.

3. The single-component high-performance polyurea coating according to claim 1, characterized in that: The leveling agent is polydimethylsiloxane; the defoamer is selected from JX883 organosilicon defoamer; the silane coupling agent is at least one of KH-550, KH-560, and KH-570; the chain extender is at least one of diethyltoluenediamine, dimethylthiotoluenediamine, and diethyltoluenediamine; and the catalyst is dibutyltin dilaurate.

4. The single-component high-performance polyurea coating according to claim 1, characterized in that: In step (1) of the method for preparing europium-doped molybdenum sulfide coated with tin phytate, the europium source is at least one of europium nitrate, europium chloride, and europium acetate; the molybdenum source includes at least one of sodium molybdate, potassium molybdate, or ammonium molybdate; the molar ratio of the molybdenum source, europium source, and thiourea is 1:0.03~0.07:3~7, and the hydrothermal reaction conditions are 8~16 h at 180~220 °C.

5. The single-component high-performance polyurea coating according to claim 1, characterized in that: In step (2) of the method for preparing europium-doped molybdenum sulfide coated with tin phytate, the tin source is at least one of tin tetrachloride, tin sulfate, and tin acetate; the ratio of europium-doped MoS2, phytic acid, and tin source is 10 g: 1 mmol: 3~5 mmol.

6. The single-component high-performance polyurea coating according to claim 1, characterized in that: In step (1) of the preparation method of Cu3P@ZIF-7, the molar ratio of copper salt to yellow phosphorus is 1:3~5, and the ratio of the amount of copper salt to surfactant added is 1 mmol: 0.1~0.3 g; the copper salt is one of copper nitrate, copper acetate or copper chloride; the surfactant is selected from sodium dioctyl succinate sulfonate and / or hexadecyltrimethylammonium bromide.

7. The single-component high-performance polyurea coating according to claim 1, characterized in that: In step (2) of the preparation method of Cu3P@ZIF-7, the volume ratio of methanol to DMF is 1:1; the ratio of Cu3P, benzimidazole and zinc source is 10g:7mmol:54~58mmol; and the zinc source is at least one of zinc nitrate, zinc chloride and zinc acetate.

8. A method for preparing a single-component high-performance polyurea coating according to any one of claims 1-7, characterized in that: The preparation method includes the following steps: (1) Mix polyether polyol, leveling agent, defoamer and chain extender, stir and heat to 100-110℃, and dehydrate under vacuum for 1-2 hours; (2) Under inert gas protection, the system in step (1) is cooled to 60-80℃, phytate-coated europium-doped molybdenum sulfide, Cu3P@ZIF-7, silane coupling agent and diluent are added, and the mixture is stirred for 1-3 hours. Then, diisocyanate and catalyst are added, and the mixture is stirred for another 3-5 hours. The mixture is then discharged to obtain a single-component high-performance polyurea coating.