Method for manufacturing antibacterial polyurethane lenses using coated silver ions loaded with zirconium dioxide

Abstract

The present invention relates to a method for manufacturing an antibacterial polyurethane lens using coated silver ion-loaded zirconium dioxide. First, the inner and outer surfaces of a resin lens are hardened, and the resin lens is immersed in an organosilicon solution. After the organosilicon adheres to the inner and outer surfaces of the resin lens, the lens is oven-cured. The polyurethane lens hardened sheet with the cured surface is then vacuum-coated to deposit materials of different refractive indices on both sides of the resin lens hard film. Subsequently, silver ion-loaded zirconium dioxide is used as a coating material and vacuum-coated on both surfaces of the lens to achieve the antibacterial effect of the lens. The present application prepares silver ion-loaded zirconium dioxide particles, and the silver ions are evenly dispersed and can be evenly distributed on the lens surface, so that the antibacterial properties of the upper and lower surfaces of the lens are consistent. The silver ion-loaded zirconium dioxide particles are directly used as the lens coating material, which optimizes the coating process of the antibacterial polyurethane lens, and the polyurethane lens obtains a good antibacterial effect.

Description

Technical Field

[0001] The present invention relates to the technical field of lenses, in particular to a method for manufacturing antibacterial polyurethane lenses using coated silver ions loaded with zirconium dioxide. Background Art

[0002] It has been found that the antimicrobial activity of metal ions decreases in the following order: Ag+ > Cd 2 +>Ni+>Al 3 +>Zn 2 +>Cu 2+ ≈Fe 3+ >Mn 2+ >Sn 2+ >Ba 2+ >Mg 2+ >Ca 2+ Among them, silver ions have significant bactericidal ability, and releasing a trace amount of silver ions in aqueous solution can have an antibacterial effect. After long-term research, the antibacterial mechanism of silver ions can be mainly classified into the following aspects.

[0003] (1) Electrostatic adsorption

[0004] Bacteria have a structure with a "negative outside and positive inside" charge distribution. When anionic groups such as -COO-, O-, P03-, and S- on the cell wall and cell membrane encounter external silver ions, the silver ions easily approach the cell surface and adsorb on the cell wall due to the attraction of opposite charges, thereby breaking the charge balance and ion concentration balance inside and outside the cell, and ultimately leading to bacterial 'contact death'.

[0005] (2) Metal dissolution sterilization

[0006] The cell wall is primarily composed of peptidoglycan. Silver ions disrupt the cell wall primarily by inhibiting the linkage between polysaccharide chains and polypeptides within the peptidoglycan, thereby disrupting the integrity of the cell wall. When silver ions approach the cell membrane surface, they bind to functional groups such as -SH and -NH2 in proteins, hindering microbial metabolism and energy metabolism, affecting normal bacterial reproduction. When silver ions bind to amino groups in nucleic acids, they also hinder the replication of genetic information and disrupt normal physiological activities within the cell, such as electron transport, mass transport, and respiration.

[0007] (3) Photocatalytic sterilization

[0008] Silver ions can activate oxygen in the air and water under the action of light, generating active oxygen ions and hydroxyl free radicals, thereby destroying the reproduction of microorganisms and inhibiting or killing bacteria. Visible light excites electrons e- and reduces the O2 adsorbed by silver into active oxygen ions O2-; light excites positively charged electron holes h +, oxidizing OH- into hydroxyl radical -OH, which can destroy cell proliferation in a short period of time and cause bacterial death.

[0009] (4) Combined sterilization

[0010] In response to the aforementioned antibacterial mechanisms, a composite mechanism of action has been proposed for silver antibacterial materials, encompassing both the antibacterial dissolution mechanism of silver ions, their contact antibacterial effects, and their photocatalytic activity. Because bacterial growth and reproduction are influenced by a complex and diverse environment, including temperature, humidity, pH, and atmospheric conditions, it is difficult to accurately determine the cause of bacterial death under current observation and testing conditions. In 2000, Feng and colleagues observed morphological changes in Staphylococcus aureus and Escherichia coli after exposure to silver ions. They found that after 4-12 hours of exposure to 10 ppm silver nitrate, the bacteria exhibited DNA condensation, cell membrane separation, and cell wall disruption, demonstrating that silver ions possess a significant bactericidal effect, with varying degrees of activity against different bacterial types. In 2005, Morones et al. found that silver inhibition zones exceeded 95 ppm against Escherichia coli, Vibrio cholerae, Salmonella typhi, and Pseudomonas aeruginosa. The researchers also analyzed the antibacterial mechanism of silver particles. They believe that a large amount of silver ions will first affect the permeability of the membrane; silver ions are released into the environment and come into contact with the cell surface, which can destroy the cohesion of the cell membrane; at the same time, silver interacts with sulfur-containing proteins and phosphorus-containing DNA in the cells, interfering with cell division and leading to cell death.

[0011] The advantages of silver antibacterial materials such as high activity, long-term effectiveness, safety and low toxicity have attracted widespread attention. However, the silver antibacterial materials currently under study still have certain shortcomings and deficiencies. From the perspective of silver ion release ability, the ion release process of silver nanoparticles requires redox reaction, so its ion release is a slow process. The current silver ion antibacterial agents have a single structural type.

[0012] The amount of ion release is difficult to control, which is not conducive to regulating the activity of antibacterial materials. In addition, a large amount of silver ions covering the wound area can easily lead to skin discoloration, cell poisoning, and allergic reactions.

[0013] From the perspective of synthesis methods, the reaction conditions for preparing silver nanoparticles using physical synthesis methods are relatively intense, and the material particles formed are uneven. Silver nanoparticles synthesized using chemical methods are mostly prone to precipitation or agglomeration, and the reaction conditions have a greater impact on the morphology of the particles. Trace amounts of impurities in the solution can also affect the properties of the product.

[0014] From the perspective of silver ion stability, most silver antimicrobial agents are photosensitive due to the large amount of silver ions or silver nanoparticles contained in them. Under light conditions, silver antimicrobial agents are prone to discoloration when exposed to air, which also limits the practical application of these antimicrobial agents from an aesthetic perspective.

[0015] Coordination polymers are polymers assembled from metal ions and organic ligands through coordination interactions. The diverse nature of the metal ions and ligands in coordination polymers allows for flexible structures and unique properties. With metal ions as the connecting points, these polymers are linked by organic ligands to form a porous framework with high porosity and high specific surface area. This unique porous structure has attracted widespread attention over the past few decades, and the number of literature reports related to coordination polymers has increased dramatically. In recent years, coordination compounds, as a key branch of inorganic chemistry, have rapidly developed across various fields. Transition metal coordination polymers have been extensively studied in catalysis, optoelectronic materials, gas adsorption / desorption, and gas storage. However, their application in biomedical fields, such as drug delivery, drug storage, imaging agents, and bioprobes, remains at an exploratory stage. The application of coordination polymers in biological applications requires a comprehensive assessment of their structure, properties, toxicity, and stability.

[0016] The present invention comprises preparing a zirconium oxychloride aqueous solution by dissolving ZrOCl2,·8H20 in water and stirring uniformly to form an aqueous solution; preparing an ammonia aqueous solution by adding water dropwise to the ammonia solution to form an ammonia aqueous solution in a certain proportion; adding the zirconium oxychloride aqueous solution dropwise to the ammonia aqueous solution; dissolving silver nitrate in water and subsequently adding polyvinylpyrrolidone to obtain a polyvinylpyrrolidone silver nitrate solution; mixing the polyvinylpyrrolidone silver nitrate solution and the zirconium oxychloride aqueous solution to obtain a zirconium hydroxide silver ion solution, and then freeze-drying the solution to remove water from the solution. Subsequently, ethanol is added for multiple washing to remove impurities from the material. After washing, the material is dried in a drying oven and calcined in a muffle furnace to obtain silver ion-loaded zirconium dioxide. The silver ion-loaded zirconium dioxide is then used as a coating material and vacuum-coated onto both surfaces of the lens to achieve the antibacterial effect of the lens. Specifically, the vacuum degree of the vacuum coating method is less than or equal to 5.0×10- 3 Pa, and the coating temperature is greater than 40°C. The reflectivity of the obtained vacuum-coated lens film is 0.8-1.5%. The film structure on the upper and lower surfaces of the lens is 9 layers, including the first layer of low refractive index film, the second layer of high refractive index film, the third layer of low refractive index film, the fourth layer of high refractive index film, the fifth layer of low refractive index film, the sixth layer of high refractive index film, the seventh layer of low refractive index film, the eighth layer of silver ion-loaded zirconium dioxide layer, and the ninth layer of fluoride. Summary of the Invention

[0017] The purpose of the present invention is to overcome the shortcomings of the existing technology and provide a method for manufacturing antibacterial polyurethane lenses using coated silver ion-loaded zirconium dioxide; this application proposes for the first time to use silver ion-loaded zirconium dioxide as a coating material, vacuum coating it on both surfaces of the lens to achieve the antibacterial effect of the lens, which is the main technical feature of this application.

[0018] The object of the present invention is achieved through the following technical solutions:

[0019] A method for manufacturing an antibacterial polyurethane lens using coated silver ions loaded with zirconium dioxide, the specific steps of which are:

[0020] First, harden the inner and outer surfaces of the resin lens, immerse the resin lens in a silicone solution, and then cure it in an oven after the silicone adheres to the inner and outer surfaces of the resin lens. Specifically, the polyurethane lens substrate is first cleaned by a lens cleaning machine, and then immersed in a 1.60 refractive index silicone composite zirconium dioxide sol. After slowly withdrawing from the sol, it is dried in an 80-degree oven, and then cured in a 120-degree oven for two hours. The polyurethane lens with a cured surface is then vacuum coated. The method is used to deposit different refractive index materials on both sides of the resin lens with a hard film, and then silver ion-loaded zirconium dioxide is used as the coating material and vacuum-coated on both surfaces of the lens to achieve the antibacterial effect of the lens; the film structure of the upper and lower surfaces of the lens substrate is nine layers, including nine layers from the inside to the outside, the first layer of low refractive index film, the second layer of high refractive index film, the third layer of low refractive index film, the fourth layer of high refractive index film, the fifth layer of low refractive index film, the sixth layer of high refractive index film, the seventh layer of low refractive index film, the eighth layer of silver ion-loaded zirconium dioxide layer, and the ninth layer of fluoride.

[0021] The vacuum degree of the vacuum coating method is less than or equal to 5.0×10 -3 Pa, the coating temperature is greater than 40℃.

[0022] The first layer is silicon dioxide with a thickness of 70nm; the second layer is zirconium dioxide with a thickness of 20nm; the third layer is silicon dioxide with a thickness of 35nm; the fourth layer is zirconium dioxide with a thickness of 40nm; the fifth layer is silicon dioxide with a thickness of 30nm; the sixth layer is zirconium dioxide with a thickness of 15nm; the seventh layer is silicon dioxide with a thickness of 20nm; the eighth layer is a nano-silver-doped zirconium dioxide layer with a thickness of 30nm; and the ninth layer is fluoride with a thickness of 12nm.

[0023] The reflectivity of the vacuum coating film on the lens is 0.8-1.5%.

[0024] Silver ion loaded zirconium dioxide, the mass percentage of its raw material components is:

[0025]

[0026]

[0027] The preparation method of silver ion loaded zirconium dioxide comprises the following specific steps:

[0028] (1) preparing a zirconium oxychloride aqueous solution, dissolving ZrOCl2·8H20 in water, and stirring uniformly to form an aqueous solution;

[0029] (2) preparing an aqueous ammonia solution by adding water dropwise to the ammonia solution to form an aqueous ammonia solution;

[0030] (3) Adding zirconium oxychloride aqueous solution dropwise to the ammonia aqueous solution;

[0031] (4) dissolving silver nitrate in water, and then adding polyvinyl pyrrolidone to obtain a polyvinyl pyrrolidone silver nitrate solution;

[0032] (5) Mixing polyvinyl pyrrolidone silver nitrate solution and zirconium oxychloride aqueous solution to obtain zirconium hydroxide silver ion solution, and removing water from the solution by freeze drying; then, adding ethanol to wash the solution multiple times to remove impurities in the material; after washing, drying the solution in a drying oven, and calcining the solution in a muffle furnace to obtain silver ion-loaded zirconium dioxide.

[0033] The substrate of the polyurethane lens is obtained by thermal curing polymerization of isocyanate and polythiol, wherein the polythiol includes polythioether thiol and polyester thiol, and the polythioether thiol and polyester thiol are 4-mercaptomethyl-1,8-dimercapto-3,6-dithia-octane, 2,5-dimercaptomethyl-1,4-dithiane, 1,1,3,3-tetrakis(mercaptomethylthio)propane, 5,7-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane, 4,7-dimercaptomethyl-1,11-dimercapto-3,6, 9-trithiaundecane, 4,8-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane, trimethylolpropane tris(3-mercaptopropionate), trimethylolethane tris(2-mercaptoacetate), pentaerythritol tetrakis(2-mercaptoacetate) and pentaerythritol tetrakis(3-mercaptopropionate), bis(2-hydroxyethyl) sulfide, 1,2-bis(2-hydroxyethylmercapto)ethane, bis(2-hydroxyethyl) disulfide and 1,4-dithiane-2,5-diol. One or more combinations thereof. The polyisocyanates are 1,3-bis(isocyanatomethyl)benzene (m-xylylenediisocyanate, m-XDI), 1,4-bis(isocyanatomethyl)benzene (p-xylylenediisocyanate, p-XDI), 1,3-bis(2-isocyanatoprop-2-yl)benzene (m-tetramethylxylenediisocyanate, m-TMXDI), 1,4-bis(2-isocyanatoprop-2-yl)benzene (p-tetramethylxylenediisocyanate, p-TMXDI), 1,3-bis(isocyanatomethyl)-4-methylbenzene, 1,3-bis(isocyanatomethyl)-4-ethylbenzene, 1,3-bis(isocyanatomethyl)-5-methylbenzene, 1,3-bis(isocyanatomethyl)-4 ,5-dimethylbenzene, 1,4-bis(isocyanatomethyl)-2,5-dimethylbenzene, 1,4-bis(isocyanatomethyl)-2,3,5,6-tetramethylbenzene, 1,3-bis(isocyanatomethyl)-5-tert-butylbenzene, 1,3-bis(isocyanatomethyl)-4-chlorobenzene, 1,3-bis(isocyanatemethyl)-4,5-dichlorobenzene, 1,3-bis(isocyanatomethyl)-2,4,5,6-tetrachlorobenzene, 1,4-bis(isocyanatomethyl)-2,3,5,6-tetrachlorobenzene, 1,4-bis(isocyanatomethyl)-2,3,5,6-tetrabromobenzene, 1,4-bis(2-isocyanatoethyl)benzene, 1,4-bis(isocyanatomethyl)naphthalene. The auxiliary agents generally used in the polymerization of polythiol and isocyanate include catalysts, release agents, colorants, antioxidants and light absorbers.First, add all the additives to the isocyanate and stir to dissolve. After complete dissolution, add polythiol while stirring; the ratio of polythiol to polyisocyanate should be based on the functional group NCO / SH molar ratio of 0.8:1 to 1.2:1; after vacuum degassing, pour the raw materials into a glass mold, and place the polyurethane raw materials in a specific curing furnace for curing according to the curing procedure. After complete curing, cool to 80 degrees, demold and clean to obtain the polyurethane lens substrate; the curing procedure is:

[0034] 25℃~35℃ 0.5h~3h

[0035] 35℃~41℃ 3h~5h

[0036] 41℃~57℃ 3h~5h

[0037] 57℃~81℃ 4h~5h

[0038] 81℃~96℃ 3h~5h

[0039] 96℃~130℃ 3h~5h

[0040] 130℃~130℃ 3h~5h

[0041] 130℃~80℃ 3h~5h

[0042] 80℃~80℃ 1h~3h

[0043] At 80°C, the mold is removed to obtain a polyurethane lens substrate with a refractive index of 1.60.

[0044] Compared with the prior art, the present invention has the following positive effects:

[0045] This application prepares silver ion-loaded zirconium dioxide particles. The silver ions are evenly dispersed and distributed evenly across the lens surface, ensuring consistent antimicrobial properties on both the upper and lower surfaces. Using these silver ion-loaded zirconium dioxide particles directly as a lens coating material optimizes the coating process for antimicrobial polyurethane lenses, achieving excellent antimicrobial efficacy. As an antimicrobial material, silver ions exhibit significantly better antimicrobial efficacy than other metal particles. DETAILED DESCRIPTION

[0046] The following provides a specific embodiment of the present invention's method for manufacturing a silver ion-coated zirconium dioxide antibacterial polyurethane lens.

[0047] Example 1

[0048] Place zirconium oxychloride aqueous solution, 5 g ZrOC 12Dissolve 8H20 in 20g of water and stir to form an aqueous solution; prepare 30g of ammonia aqueous solution and add water dropwise to the ammonia solution to form a 10% ammonia aqueous solution; add 25g of zirconium oxychloride aqueous solution dropwise to the 30g ammonia aqueous solution;

[0049] Dissolve 2 grams of silver nitrate in 15 grams of water, then add 5 grams of polyvinyl pyrrolidone to obtain a polyvinyl pyrrolidone silver nitrate solution; mix 22 grams of polyvinyl pyrrolidone silver nitrate solution with the above-mentioned 55 grams of zirconium oxychloride aqueous solution to obtain a zirconium hydroxide silver ion solution, and remove the water in the solution by freeze-drying. Subsequently, add ethanol and wash it multiple times to remove impurities in the material. After cleaning, dry it in a drying oven and calcine it in a muffle furnace to obtain silver ion-loaded zirconium dioxide. Subsequently, the silver ion-loaded zirconium dioxide is used as a coating material and vacuum-coated on both surfaces of the lens to achieve the antibacterial effect of the lens. Specifically, the vacuum degree of the vacuum coating method is 3.5×10- 3 Pa, and the coating temperature is 60°C. The reflectivity of the vacuum-coated lens film obtained is 1.1%. The film structure on the upper and lower surfaces of the lens is 9 layers. The first layer is silicon dioxide, with a thickness of 70nm; the second layer is zirconium dioxide, with a thickness of 20nm; the third layer is silicon dioxide, with a thickness of 35nm; the fourth layer is zirconium dioxide, with a thickness of 40nm; the fifth layer is silicon dioxide, with a thickness of 30nm; the sixth layer is zirconium dioxide, with a thickness of 15nm; the seventh layer is silicon dioxide, with a thickness of 20nm; the eighth layer is nanosilver-doped zirconium dioxide, with a thickness of 30nm; and the seventh layer is fluoride, with a thickness of 12nm.

[0050] The antibacterial test found that the antibacterial rate against Escherichia coli was 99.1%, the antibacterial rate against Staphylococcus aureus was 99.4%, and the antibacterial rate against Candida albicans was 99.2%. From the above experimental data, it can be seen that the antibacterial functional polyurethane lens prepared by the present invention has a broad spectrum of antibacterial effects and is highly effective.

[0051] Example 2

[0052] Place zirconium oxychloride aqueous solution, 5 g ZrOC 12 Dissolve 8H20 in 20g of water and stir to form an aqueous solution; prepare 30g of ammonia aqueous solution and add water dropwise to the ammonia solution to form a 10% ammonia aqueous solution; add 25g of zirconium oxychloride aqueous solution dropwise to the 30g ammonia aqueous solution;

[0053] Dissolve 1 gram of silver nitrate in 15 grams of water, then add 5 grams of polyvinyl pyrrolidone to obtain a polyvinyl pyrrolidone silver nitrate solution; mix 22 grams of polyvinyl pyrrolidone silver nitrate solution with the above-mentioned 55 grams of zirconium oxychloride aqueous solution to obtain a zirconium hydroxide silver ion solution, and remove the water in the solution by freeze drying. Subsequently, ethanol was added for multiple washings to remove impurities in the material. After cleaning, it was dried in a drying oven and calcined in a muffle furnace to obtain silver ion-loaded zirconium dioxide. Subsequently, the silver ion-loaded zirconium dioxide was used as a coating material and vacuum-coated on both surfaces of the lens to complete the antibacterial effect of the lens. Specifically, the vacuum degree of the vacuum coating method was 3.5×10 -3 Pa, and the coating temperature is 60°C. The reflectivity of the vacuum-coated lens film obtained is 1.0%. The film structure on the upper and lower surfaces of the lens is 9 layers. The first layer is silicon dioxide, with a thickness of 70nm; the second layer is zirconium dioxide, with a thickness of 20nm; the third layer is silicon dioxide, with a thickness of 35nm; the fourth layer is zirconium dioxide, with a thickness of 40nm; the fifth layer is silicon dioxide, with a thickness of 30nm; the sixth layer is zirconium dioxide, with a thickness of 15nm; the seventh layer is silicon dioxide, with a thickness of 20nm; the eighth layer is nano-silver-doped zirconium dioxide, with a thickness of 30nm; and the seventh layer is fluoride, with a thickness of 12nm.

[0054] The antibacterial test found that the antibacterial rate of Escherichia coli was 99.2%, the antibacterial rate of Staphylococcus aureus was 99.5%, and the antibacterial rate of Candida albicans was 99.3%. From the above experimental data, it can be seen that the antibacterial functional polyurethane lens prepared by the present invention has a broad spectrum of antibacterial effects and high efficiency.

[0055] The above is only a preferred embodiment of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and modifications without departing from the concept of the present invention. These improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for manufacturing an antibacterial polyurethane lens using coated silver ions loaded with zirconium dioxide, characterized in that: The specific steps are: First, harden the inner and outer surfaces of the resin lens, immerse the resin lens in a silicone solution, and then cure it in an oven after the silicone adheres to the inner and outer surfaces of the resin lens. Specifically, the polyurethane lens substrate is first cleaned by a lens cleaning machine, and then immersed in a 1.60 refractive index silicone composite zirconium dioxide sol. After slowly withdrawing from the sol, it is dried in an 80-degree oven, and then cured in a 120-degree oven for two hours. The polyurethane lens with a cured surface is then vacuum coated. The method is to deposit different refractive index materials on both sides of the resin lens with a hard film, and then silver ion-loaded zirconium dioxide is used as a coating material and vacuum-coated on both surfaces of the lens to achieve the antibacterial effect of the lens; the film structure of the upper and lower surfaces of the lens substrate is nine layers, including nine layers from the inside to the outside, the first layer of low refractive index film, the second layer of high refractive index film, the third layer of low refractive index film, the fourth layer of high refractive index film, the fifth layer of low refractive index film, the sixth layer of high refractive index film, the seventh layer of low refractive index film, the eighth layer of silver ion-loaded zirconium dioxide layer, and the ninth layer of fluoride; Silver ion loaded zirconium dioxide, the mass percentage of its raw material components is: 8-hydrated zirconium oxychloride 1~10% Ammonia 6-30% Silver nitrate 1-10% Polyvinylpyrrolidone 2-20% Ethanol 3-30% Water balance.

2. The method for manufacturing an antibacterial polyurethane lens using coated silver ions loaded with zirconium dioxide according to claim 1, characterized in that: The vacuum degree of the vacuum coating method is less than or equal to 5.0×10 -3 Pa, coating temperature is greater than 40℃.

3. The method for manufacturing an antibacterial polyurethane lens using coated silver ions loaded with zirconium dioxide according to claim 1, characterized in that: The first layer is silicon dioxide with a thickness of 70nm; the second layer is zirconium dioxide with a thickness of 20nm; the third layer is silicon dioxide with a thickness of 35nm; the fourth layer is zirconium dioxide with a thickness of 40nm; the fifth layer is silicon dioxide with a thickness of 30nm; the sixth layer is zirconium dioxide with a thickness of 15nm; the seventh layer is silicon dioxide with a thickness of 20nm; the eighth layer is a nano-silver-doped zirconium dioxide layer with a thickness of 30nm; and the ninth layer is fluoride with a thickness of 12nm.

4. The method for manufacturing an antibacterial polyurethane lens using coated silver ions loaded with zirconium dioxide according to claim 1, characterized in that: The reflectivity of the vacuum coating film on the lens is 0.8-1.5%.

5. The method for manufacturing an antibacterial polyurethane lens using coated silver ions loaded with zirconium dioxide according to claim 1, characterized in that: The preparation method of silver ion loaded zirconium dioxide comprises the following specific steps: (1) Prepare zirconium oxychloride aqueous solution by dissolving ZrOCl2·8H20 in water and stirring evenly to form an aqueous solution; (2) preparing an aqueous ammonia solution by adding water dropwise to the ammonia solution to form an aqueous ammonia solution; (3) Add zirconium oxychloride aqueous solution dropwise to the ammonia aqueous solution; (4) dissolving silver nitrate in water, and then adding polyvinyl pyrrolidone to obtain a polyvinyl pyrrolidone silver nitrate solution; (5) Mixing polyvinyl pyrrolidone silver nitrate solution and zirconium oxychloride aqueous solution to obtain zirconium hydroxide silver ion solution, and removing water from the solution by freeze drying; then, adding ethanol to wash the solution multiple times to remove impurities in the material; after washing, drying in a drying oven, and calcining in a muffle furnace to obtain silver ion-loaded zirconium dioxide.

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