A durable silver-loaded polyurea polymer antibacterial and antiviral coating and its preparation method

Abstract

This invention discloses a durable silver-loaded polyurea polymeric antibacterial and antiviral coating and its preparation method. The preparation method of the silver-loaded polyurea polymeric antibacterial and antiviral coating includes the following steps: adding sodium-based montmorillonite to a silver nitrate solution and dispersing it; then adding hydrazine hydrate and continuing dispersion, followed by a first heating and a second vacuuming to remove the solution, obtaining silver-loaded montmorillonite; activating the silver-loaded montmorillonite with a hydrocarbon solvent, then adding it dropwise to an isocyanate, mixing, followed by a second heating and a second vacuuming to remove the hydrocarbon solvent, obtaining a silver-loaded montmorillonite isocyanate prepolymer; combining component B containing the silver-loaded montmorillonite isocyanate prepolymer with component A containing polyaspartic acid ester to obtain the final product. The coating prepared by this invention has excellent antibacterial and antiviral functions and their persistence, and also has the characteristics of wear resistance, impact resistance, chemical resistance, artificial aging resistance, and anti-slip properties, making it suitable for various applications.

Description

Technical Field

[0001] This invention belongs to the field of chemical coating technology, specifically relating to a durable silver-loaded polyurea polymer antibacterial and antiviral coating and its preparation method. Background Technology

[0002] The primary function of antibacterial and antiviral coatings is to effectively inhibit and kill the growth of bacteria and viruses, meaning they possess broad-spectrum bactericidal activity. They can effectively inhibit the growth of various common pathogens and viruses, such as Escherichia coli, Staphylococcus aureus, and influenza viruses. Simultaneously, antibacterial and antiviral coatings should also have long-lasting bactericidal properties, maintaining their bactericidal effect for a certain period, thereby effectively controlling the growth and spread of bacteria and viruses.

[0003] Currently, most antibacterial and antiviral coatings are additive-type coatings where antibacterial agents are directly added to the coating material. These coatings have a simple production process and provide good antibacterial function in the short term. However, the added antibacterial agents are difficult to disperse completely and evenly in the coating, and because the antibacterial agents are relatively denser than the coating matrix, they are prone to sedimentation during storage and even during application, affecting their uniform distribution. Furthermore, the added antibacterial agents have poor compatibility with the matrix materials and are prone to precipitation, resulting in insufficient antibacterial persistence.

[0004] Therefore, there is an urgent need to develop a coating that can have both good antibacterial and antiviral effects and long-lasting efficacy, so as to avoid repeated renovations to maintain bactericidal properties and increase material consumption. Summary of the Invention

[0005] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the present invention proposes a durable silver-loaded polyurea polymer antibacterial and antiviral coating and its preparation method. The coating is prepared by grafting isocyanate functional groups onto the surface of silver-loaded montmorillonite and reacting it with polyaspartic acid ester to solidify it into a silver-loaded polyurea polymer material with long-lasting antibacterial and antiviral functions.

[0006] To address the aforementioned technical problems, the first aspect of this invention provides a method for preparing a silver-loaded polyurea polymer antibacterial and antiviral coating, comprising the following steps:

[0007] (1) Sodium-based montmorillonite was added to silver nitrate solution and dispersed; then hydrazine hydrate was added and the dispersion continued. The solution was removed by heating once and vacuuming once to obtain silver-loaded montmorillonite.

[0008] (2) After activating the silver-loaded montmorillonite with a hydrocarbon solvent, it is added dropwise to the isocyanate, mixed, heated twice, and vacuumed twice to remove the hydrocarbon solvent, thus obtaining the silver-loaded montmorillonite isocyanate prepolymer.

[0009] (3) Combining component A with component B, wherein component A includes polyaspartic acid ester and component B includes the silver-loaded montmorillonite isocyanate prepolymer, to obtain the silver-loaded polyurea polymer antibacterial and antiviral coating.

[0010] Specifically, in the preparation of the coating of the present invention, sodium ions in sodium-based montmorillonite are first exchanged with silver ions in silver nitrate, and then the silver ions are reduced with hydrazine hydrate to obtain silver-loaded montmorillonite; then the silver-loaded montmorillonite is activated with a hydrocarbon solvent to generate active bonds, and then polymerized with isocyanate (HDI Trimer) to obtain silver-loaded montmorillonite isocyanate prepolymer (Ag-MMT-HDI Trimer); finally, the silver-loaded montmorillonite isocyanate prepolymer, polyaspartic acid ester and isocyanate are polymerized to form silver-loaded polyurea polymer material (Polyurea).

[0011] Its synthesis process is as follows:

[0012]

[0013] This invention preferably uses silver-based antibacterial agents, which are non-toxic and harmless to humans and the environment. First, silver is loaded onto montmorillonite through intermolecular interactions, and then isocyanate functional groups are grafted onto the surface of the silver-loaded montmorillonite, causing it to react with polyaspartic acid ester and solidify into a polymer material. This material not only has excellent antibacterial and antiviral functions, but also has a sustained antibacterial and antiviral effect.

[0014] Preferably, the raw materials for preparing the silver-loaded montmorillonite isocyanate prepolymer include, by weight: 1 part sodium montmorillonite, 0.5-2 parts silver nitrate, 0.5-1 part hydrazine hydrate, 15-20 parts hydrocarbon solvent, and 2-5 parts isocyanate.

[0015] Preferably, component B further includes isocyanate; in component B, the amount of isocyanate added is 0-5 times the weight of the sodium montmorillonite. That is, component B may consist only of silver-loaded montmorillonite isocyanate prepolymer, or may be used in combination with isocyanate.

[0016] Preferably, in step (1), the temperature is raised to 80-100℃ in one step.

[0017] Preferably, in step (1), the vacuum is evacuated to -0.097MPa to -0.099MPa.

[0018] Preferably, in step (1), the solvent of the silver nitrate solution is selected from at least one of ethylene glycol, diethylene glycol, propylene glycol, and glycerol, and the concentration of the silver nitrate solution is 0.1-1 mol / L.

[0019] Preferably, in step (1), the dispersion is performed by microwave ultrasonic dispersion for 30-60 minutes.

[0020] Preferably, in step (2), the isocyanate is selected from at least one of hexamethylene diisocyanate, 4,4'-diphenylmethane diisocyanate, toluene diisocyanate, isophorone diisocyanate, polymethylene polyphenyl polyisocyanate, and hexamethylene diisocyanate trimer; more preferably, the isocyanate is selected from hexamethylene diisocyanate trimer.

[0021] Preferably, in step (2), the hydrocarbon solvent is selected from toluene.

[0022] Preferably, in step (2), the temperature is controlled below 45°C during the dripping process; more preferably, the temperature is 30-45°C during the dripping process.

[0023] Preferably, in step (2), the secondary heating is carried out to 75-85°C.

[0024] Preferably, in step (2), the secondary vacuum is evacuated to -0.097MPa to -0.099MPa.

[0025] Preferably, in step (3), the preparation process of the polyaspartic ester is as follows: polyetheramine and maleate are mixed, heated, and reacted; then cyclic carbonate is added, and the reaction is continued to obtain the polyaspartic ester.

[0026] Specifically, in the preparation process of the polyaspartic ester of this invention, after the reaction of polyether amine and maleate, cyclic carbonate is added. Because cyclic carbonate reacts rapidly with primary amines, it can quickly eliminate residual primary amines. Furthermore, the reaction product contains urethane bonds and hydroxyl groups, which can improve the adhesion and mechanical properties of the polyurea product. Simultaneously, the use of monocyclic carbonate results in a smaller increase in the molecular weight of the reaction product, thus reducing the resin viscosity. This solves the problem of low amino conversion rate in the preparation of polyaspartic ester and reduces the amount of free primary amines, avoiding the problems of short activation period and short workable time of polyaspartic ester. At the same time, the polyaspartic ester prepared by this method has good adhesion to the substrate, which is beneficial for further improving the persistence of antibacterial and antiviral effects.

[0027] Preferably, the polyetheramine is a trifunctional polyetheramine.

[0028] Preferably, the maleate ester is selected from diethyl maleate, dipropyl maleate, diisobutyl maleate, or dibutyl maleate; more preferably, the maleate ester is diethyl maleate.

[0029] Preferably, the molar ratio of the polyetheramine, maleate and cyclic carbonate is 1:(2-4):(0.5-1).

[0030] Preferably, the heating temperature is 75-85°C.

[0031] Preferably, the reaction time is 10-15 hours.

[0032] Preferably, the continued reaction time is 10-15 hours.

[0033] A second aspect of the present invention provides a silver-loaded polyurea polymeric antibacterial and antiviral coating prepared by the above preparation method, comprising component A and component B, wherein component A comprises polyaspartic acid ester and component B comprises silver-loaded montmorillonite isocyanate prepolymer.

[0034] Preferably, the mass ratio of component A to component B is 1:(1-2).

[0035] Preferably, component A further includes additives, which include at least one of dispersants, wetting agents, defoamers, leveling agents, anti-settling agents, and pigments and fillers.

[0036] Preferably, the fineness of component A is less than 25 μm.

[0037] Compared with the prior art, the above-described technical solution of the present invention has at least the following technical effects or advantages:

[0038] (1) In this invention, sodium-based montmorillonite, silver nitrate and hydrazine hydrate are used as raw materials to prepare silver-loaded montmorillonite through ion exchange and reduction reaction. Then, silver-loaded montmorillonite is polymerized with isocyanate. Finally, silver-loaded montmorillonite isocyanate prepolymer, polyaspartic acid ester and isocyanate are polymerized to obtain silver-loaded polyurea polymer material. This material not only has excellent antibacterial and antiviral functions, but also has sustained antibacterial and antiviral effects.

[0039] (2) The present invention preferably uses silver-based antibacterial agents, which are non-toxic and harmless to the human body and the environment; at the same time, the silver-loaded polyurea polymer antibacterial and antiviral coating synthesized by the present invention has the characteristics of wear resistance, impact resistance, chemical resistance, artificial aging resistance and anti-slip, and is suitable for various application occasions. Detailed Implementation

[0040] The present invention will now be described in detail with reference to embodiments to facilitate understanding of the invention by those skilled in the art. It is particularly important to note that the embodiments are merely illustrative of the invention and should not be construed as limiting the scope of protection of the invention. Non-essential improvements and adjustments made to the invention by those skilled in the art based on the above description should still fall within the scope of protection of the invention. Furthermore, all raw materials mentioned below, unless otherwise specified, are commercially available products; all process steps or preparation methods not mentioned in detail are process steps or preparation methods known to those skilled in the art.

[0041] Example 1

[0042] A method for preparing a silver-loaded polyurea polymer antibacterial and antiviral coating includes the following steps:

[0043] (1) Weigh polyetheramine T403, diethyl maleate and cyclic carbonate in a molar ratio of 1:3:0.8. First, add polyetheramine T403 and diethyl maleate to the reaction vessel and heat to 80°C for 12 hours. Then add cyclic carbonate and continue to react for 12 hours. The unreacted diethyl maleate and cyclic carbonate are evaporated in the film to obtain polyaspartic acid ester resin.

[0044] (2) Add 1 part by weight of sodium montmorillonite to an ethylene glycol solution containing 0.8 parts by weight of silver nitrate (concentration: 0.1 mol / L), and sonicate in the microwave for 40 minutes to allow silver ions to exchange with sodium montmorillonite; then add 0.5 parts by weight of hydrazine hydrate to reduce the silver ions, and sonicate in the microwave for 40 minutes; raise the temperature to 90°C, evacuate to a negative pressure of -0.099 MPa, remove the solution, and obtain silver-loaded montmorillonite;

[0045] (3) Activate the silver-loaded montmorillonite obtained in step (2) with 15 parts by weight of toluene; then add 2 parts by weight of hexamethylene diisocyanate trimer to the reactor, and add the activated silver-loaded montmorillonite dropwise while stirring. During the dropwise addition, the temperature of the reactor is controlled below 45°C. After the dropwise addition is completed, continue stirring for 2 hours; then raise the temperature to 80°C, and evacuate to a negative pressure of -0.099 MPa to remove toluene and obtain the silver-loaded montmorillonite isocyanate prepolymer.

[0046] (4) Mix the silver-loaded montmorillonite isocyanate prepolymer obtained in step (3) with 0.5 parts by weight of hexamethylene diisocyanate trimer to obtain component B.

[0047] (5) Using the polyaspartic acid ester resin obtained in step (1) as the film-forming material, add 5wt‰ BYK-2150 dispersant, 3wt‰ BYK-349 wetting agent, 1wt‰ BYK-1790 defoamer, 2‰ BYK-333 leveling agent, 2‰ BYK-410 anti-settling agent, 10wt% quartz powder, and 10wt% titanium dioxide, grind until the fineness is less than 25μm, degas under vacuum, and obtain component A;

[0048] (6) Combine component A obtained in step (5) and component B obtained in step (4) at a mass ratio of 1:1.4 to obtain the silver-loaded polyurea polymer antibacterial and antiviral coating of this embodiment.

[0049] Example 2

[0050] A method for preparing a silver-loaded polyurea polymer antibacterial and antiviral coating includes the following steps:

[0051] (1) Weigh polyetheramine T403, diethyl maleate and cyclic carbonate in a molar ratio of 1:3:1. First, add polyetheramine T403 and diethyl maleate to the reaction vessel and heat to 85°C for 10 hours. Then add cyclic carbonate and continue to react for 10 hours. The unreacted diethyl maleate and cyclic carbonate are evaporated in the film to obtain polyaspartic acid ester resin.

[0052] (2) Add 1 part by weight of sodium montmorillonite to an ethylene glycol solution containing 0.8 parts by weight of silver nitrate (concentration: 0.1 mol / L), and sonicate in the microwave for 50 minutes to allow silver ions to exchange with sodium montmorillonite; then add 0.5 parts by weight of hydrazine hydrate to reduce the silver ions, and sonicate in the microwave for 40 minutes; raise the temperature to 85°C, evacuate to a negative pressure of -0.099 MPa, remove the solution, and obtain silver-loaded montmorillonite;

[0053] (3) Activate the silver-loaded montmorillonite obtained in step (2) with 20 parts by weight of toluene; then add 2 parts by weight of hexamethylene diisocyanate trimer to the reactor, and add the activated silver-loaded montmorillonite dropwise while stirring. During the dropwise addition, the temperature of the reactor is controlled below 45°C. After the dropwise addition is completed, continue stirring for 2 hours; then raise the temperature to 80°C, and evacuate to a negative pressure of -0.099 MPa to remove toluene and obtain the silver-loaded montmorillonite isocyanate prepolymer.

[0054] (4) Mix the silver-loaded montmorillonite isocyanate prepolymer obtained in step (3) with 0.5 parts by weight of hexamethylene diisocyanate trimer to obtain component B.

[0055] (5) Using the polyaspartic acid ester resin obtained in step (1) as the film-forming material, add 5wt‰ BYK-2150 dispersant, 3wt‰ BYK-349 wetting agent, 1wt‰ BYK-1790 defoamer, 2‰ BYK-333 leveling agent, 2‰ BYK-410 anti-settling agent, 10wt% quartz powder, and 10wt% titanium dioxide, grind until the fineness is less than 25μm, degas under vacuum, and obtain component A;

[0056] (6) Combine component A obtained in step (5) and component B obtained in step (4) at a mass ratio of 1:1.4 to obtain the silver-loaded polyurea polymer antibacterial and antiviral coating of this embodiment.

[0057] Example 3

[0058] A method for preparing a silver-loaded polyurea polymer antibacterial and antiviral coating includes the following steps:

[0059] (1) Weigh polyetheramine MA340, diethyl maleate and cyclic carbonate in a molar ratio of 1:4:0.6. First, add polyetheramine MA340 and diethyl maleate to the reaction vessel and heat to 75°C for 14 hours. Then add cyclic carbonate and continue to react for 14 hours. The unreacted diethyl maleate and cyclic carbonate are evaporated in the film to obtain polyaspartic acid ester resin.

[0060] (2) Add 1 part by weight of sodium montmorillonite to an ethylene glycol solution containing 0.8 parts by weight of silver nitrate (concentration: 0.1 mol / L), and sonicate in the microwave for 50 minutes to allow silver ions to exchange with sodium montmorillonite; then add 0.5 parts by weight of hydrazine hydrate to reduce the silver ions, and sonicate in the microwave for 50 minutes; raise the temperature to 95°C, evacuate to a negative pressure of -0.099 MPa, remove the solution, and obtain silver-loaded montmorillonite;

[0061] (3) Activate the silver-loaded montmorillonite prepared in step (2) with 20 parts by weight of toluene; then add 3 parts by weight of hexamethylene diisocyanate trimer to the reactor, and add the activated silver-loaded montmorillonite dropwise while stirring. During the dropwise addition, the temperature of the reactor is controlled below 45°C. After the dropwise addition is completed, continue stirring for 2 hours; then raise the temperature to 80°C, and evacuate to a negative pressure of -0.099 MPa to remove toluene and obtain the silver-loaded montmorillonite isocyanate prepolymer.

[0062] (4) Mix the silver-loaded montmorillonite isocyanate prepolymer obtained in step (3) with 0.3 parts by weight of hexamethylene diisocyanate trimer to obtain component B;

[0063] (5) Using the polyaspartic acid ester resin obtained in step (1) as the film-forming material, add 5wt‰ BYK-2150 dispersant, 3wt‰ BYK-349 wetting agent, 1wt‰ BYK-1790 defoamer, 2‰ BYK-333 leveling agent, 2‰ BYK-410 anti-settling agent, 10wt% quartz powder, and 10wt% titanium dioxide, grind until the fineness is less than 25μm, degas under vacuum, and obtain component A;

[0064] (6) Combine component A obtained in step (5) and component B obtained in step (4) at a mass ratio of 1:1.2 to obtain the silver-loaded polyurea polymer antibacterial and antiviral coating of this embodiment.

[0065] Comparative Example 1

[0066] A method for preparing a polyurea polymer antibacterial and antiviral coating includes the following steps:

[0067] (1) Weigh polyetheramine T403, diethyl maleate and cyclic carbonate in a molar ratio of 1:3:0.8. First, add polyetheramine T403 and diethyl maleate to the reaction vessel and heat to 80°C for 12 hours. Then add cyclic carbonate and continue to react for 12 hours. The unreacted diethyl maleate and cyclic carbonate are evaporated in the film to obtain polyaspartic acid ester resin.

[0068] (2) Using the polyaspartic acid ester resin obtained in step (1) as the film-forming material, add 5wt‰ BYK-2150 dispersant, 3wt‰ BYK-349 wetting agent, 1wt‰ BYK-1790 defoamer, 2‰ BYK-333 leveling agent, 2‰ BYK-410 antisettling agent, 10wt% quartz powder, 10wt% titanium dioxide and 1wt% silver ion antibacterial agent, grind until the fineness is less than 25μm, degas under vacuum to obtain component A;

[0069] (3) Mix the A component and the B component hexamethylene diisocyanate trimer obtained in step (2) at a mass ratio of 1:1.4 to obtain the silver ion-added antibacterial and antiviral coating of this comparative example.

[0070] Comparative Example 2

[0071] A method for preparing a polyurea polymer antibacterial and antiviral coating includes the following steps:

[0072] (1) Weigh polyetheramine T403, diethyl maleate and cyclic carbonate in a molar ratio of 1:3:0.8. First, add polyetheramine T403 and diethyl maleate to the reaction vessel and heat to 80°C for 12 hours. Then add cyclic carbonate and continue to react for 12 hours. The unreacted diethyl maleate and cyclic carbonate are evaporated in the film to obtain polyaspartic acid ester resin.

[0073] (2) Using the polyaspartic acid ester resin obtained in step (1) as the film-forming material, add 5wt‰ BYK-2150 dispersant, 3wt‰ BYK-349 wetting agent, 1wt‰ BYK-1790 defoamer, 2‰ BYK-333 leveling agent, 2‰ BYK-410 antisettling agent, 10wt% quartz powder, 10wt% titanium dioxide and 1wt% copper ion antibacterial agent, grind until the fineness is less than 25μm, degas under vacuum to obtain component A;

[0074] (3) Mix the A component and the B component hexamethylene diisocyanate trimer obtained in step (2) at a mass ratio of 1:1.4 to obtain the copper ion-added antibacterial and antiviral coating of this comparative example.

[0075] Performance testing

[0076] 1. Antibacterial and antiviral properties

[0077] According to the standards HG / T 3950-2007 antibacterial coatings, TG DTL 011-2020 antibacterial and antiviral coatings, and GB / T 1741-2007 film mildew resistance, the antibacterial, antiviral, and mildew resistance properties and the persistence of the coating samples prepared in Examples 1-3 and Comparative Examples 1-2 were tested, and the results are shown in Table 1.

[0078] The test method for antibacterial durability of antibacterial coatings in standard HG / T 3950-2007 is as follows: a 30W ultraviolet lamp with a wavelength of 253.7nm is used. The ultraviolet lamp conforms to GB 19258-2012. The antibacterial coating test panel is placed 0.8m-1.0m away from the ultraviolet lamp and irradiated for 100 hours to test the antibacterial durability performance of the test panel.

[0079] The test method for the antiviral durability of antibacterial and antiviral coatings according to standard TG DTL 011-2020 is as follows: After the test panels are prepared, they are completely immersed in a glass water tank or glass container filled with water at 25°C. The test panels do not touch each other, and the water level is 20 mm above the test panels. The immersion time is 24 hours. After immersion, there should be no blistering, peeling, cracking, or other phenomena on the surface of the coating film on the test panels. After removal, a 30W ultraviolet lamp with a wavelength of 253.7nm (compliant with GB 19258-2012) is used. The antibacterial coating test panels are placed 0.8m-1.0m away from the ultraviolet lamp and irradiated for 100 hours to conduct the antiviral durability test.

[0080] The test method for the durability of mildew resistance of paint films in the standard GB / T 1741-2007 is as follows: After the paint film is prepared, it is placed in slowly flowing tap water at room temperature for 24 hours, taking care that the water flow should not directly wash onto the paint film. After the test film is removed and dried at room temperature, the mildew resistance of the paint film is examined after the sample condition has stabilized (there should be no blistering, peeling, cracking, etc.).

[0081] Table 1:

[0082]

[0083] As shown in Table 1, the silver-loaded polyurea polymer antibacterial and antiviral coatings prepared in Examples 1-3 of this invention all exhibit excellent antibacterial, antiviral, and antifungal properties, with good persistence. However, the coatings prepared in Comparative Examples 1-2, due to the use of external antibacterial agents, show a significant decrease in antibacterial durability, antiviral durability, and antifungal persistence compared to before aging. The main reasons for this are: the externally added silver or copper ion antibacterial agents are physically dispersed, resulting in poor dispersion uniformity in the coating; simultaneously, due to the high specific gravity of the silver or copper ion antibacterial agents, they are prone to sedimentation during storage and even use, leading to poor storage stability; furthermore, the externally added silver or copper ion antibacterial agents tend to slowly precipitate, thus reducing the antibacterial effect of the coating and resulting in insufficient antibacterial persistence.

[0084] 2. Other properties of coatings

[0085] Other properties of the coating prepared in Example 1 were tested according to standard GB / T 22374-2018, and the results are shown in Table 2.

[0086] Table 2:

[0087]

[0088]

[0089] As shown in Table 2, the silver-loaded polyurea polymer antibacterial and antiviral coating prepared in Example 1 of this invention has good wear resistance, impact resistance, water resistance, chemical resistance, artificial aging resistance, and anti-slip properties, making it suitable for various applications. The properties of the silver-loaded polyurea polymer antibacterial and antiviral coatings prepared in Examples 2-3 are similar to those in Example 1.

[0090] For those skilled in the art, several simple deductions or substitutions can be made without departing from the inventive concept, without requiring creative effort. Therefore, any simple improvements made to this invention by those skilled in the art based on the disclosure of this invention should be within the scope of protection of this invention. The above embodiments are preferred embodiments of this invention, and all processes similar to this invention and equivalent changes should fall within the scope of protection of this invention.

Claims

1. A method for preparing a silver-loaded polyurea high-molecular antibacterial and antiviral coating, characterized in that, The method comprises the following steps: (1) adding sodium-based montmorillonite into silver nitrate solution and dispersing; then adding hydrazine hydrate and dispersing, once heating, once vacuumizing, and removing solution to obtain silver-loaded montmorillonite; (2) activating the silver-loaded montmorillonite with a hydrocarbon solvent, then dropping the silver-loaded montmorillonite into isocyanate, mixing, twice heating, twice vacuumizing, and removing the hydrocarbon solvent to obtain silver-loaded montmorillonite isocyanate prepolymer; (3) combining A component with B component, wherein the A component comprises polyaspartic ester, and the B component comprises the silver-loaded montmorillonite isocyanate prepolymer to obtain the silver-loaded polyurea high-molecular antibacterial and antiviral coating.

2. The method for preparing silver-loaded polyurea high-molecular antibacterial and antiviral coating according to claim 1, characterized in that, The raw materials for preparing the silver-loaded montmorillonite isocyanate prepolymer comprise, by weight fraction, 1 part of sodium-based montmorillonite, 0.5-2 parts of silver nitrate, 0.5-1 part of hydrazine hydrate, 15-20 parts of hydrocarbon solvent, and 2-5 parts of isocyanate.

3. The method for preparing silver-loaded polyurea high-molecular antibacterial and antiviral coating according to claim 2, characterized in that, The B component further comprises isocyanate; in the B component, the isocyanate is added in an amount of 0-5 times the weight of the sodium-based montmorillonite.

4. The method for preparing silver-loaded polyurea high-molecular antibacterial and antiviral coating according to claim 1, characterized in that, In step (1), the once heating is to 80-100℃; and / or, the once vacuumizing is to -0.097MPa to -0.099MPa. And / or, the solvent of the silver nitrate solution is selected from at least one of ethylene glycol, diethylene glycol, propylene glycol, and glycerol. 5.The method for preparing silver-loaded polyurea high-molecular antibacterial and antiviral coating according to claim 1, characterized in that, In step (2), the isocyanate is selected from at least one of hexamethylene diisocyanate, 4,4'-diphenylmethane diisocyanate, toluene diisocyanate, isophorone diisocyanate, polymethylene polyphenyl polyisocyanate, and hexamethylene diisocyanate trimer. 6.The method for preparing silver-loaded polyurea high-molecular antibacterial and antiviral coating according to claim 1, characterized in that, In step (2), the reaction temperature during the dropping process is controlled below 45℃; and / or, the twice heating is to 75-85℃; and / or, the twice vacuumizing is to -0.097MPa to -0.099MPa.

7. The method for preparing the silver-loaded polyurea polymer antibacterial and antiviral coating according to claim 1, characterized in that, In step (3), the preparation process of the polyaspartic ester is as follows: mixing polyether amine with maleate and heating to react; then adding cyclic carbonate and continuing to react to obtain the polyaspartic ester.

8. The method for preparing silver-loaded polyurea high-molecular antibacterial and antiviral coating according to claim 7, characterized in that, The molar ratio of the polyether amine, the maleate, and the cyclic carbonate is 1:(2-4):(0.5-1); and / or, the heating temperature is 75-85℃.

9. The silver-loaded polyurea high-molecular antibacterial and antiviral coating prepared by the preparation method according to any one of claims 1 to 8, characterized in that, The method comprises A component and B component, wherein the A component comprises polyaspartic ester, and the B component comprises silver-loaded montmorillonite isocyanate prepolymer. 10.The silver-loaded polyurea high-molecular antibacterial and antiviral coating of claim 9, wherein, The mass ratio of the A component to the B component is 1:(1-2).

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