Fluorescent antibacterial coating as well as preparation method and application thereof

Abstract

The invention discloses a fluorescent antibacterial coating as well as a preparation method and application thereof, and belongs to the technical field of powder coatings and fluorescent materials. The preparation method of the fluorescent antibacterial coating comprises the following steps: S1, mixing a fluorescent antibacterial agent with a powder coating, or mixing raw materials of the fluorescent antibacterial agent and the powder coating, extruding and grinding to obtain the fluorescent antibacterial coating; s2, coating a base material with the fluorescent antibacterial coating, and baking to obtain a fluorescent antibacterial coating; the chemical formula of the fluorescent antibacterial agent is Cs2Ag < 1-x > Na < x > MX < 6 > or CsAgX < 2 >; wherein x is more than or equal to 0 and less than 1, and M is at least one of In, Bi and Mn; and X is one of Cl, Br and I. The fluorescent antibacterial agent and the powder coating are mixed and cured, so that the fluorescent antibacterial agent is synthesized in situ in the solid-phase coating, generation of non-target crystal phases is reduced, and the crystal phase purity of the fluorescent antibacterial agent is improved.

Description

Technical Field

[0001] The present invention belongs to the technical fields of powder coatings and fluorescent materials, and particularly relates to a fluorescent antibacterial coating, a preparation method thereof, and an application thereof. Background Art

[0002] According to the differences in application scenarios and coated objects, coatings often have functional characteristics such as decoration, anti-corrosion, weather resistance, fire protection, and antibacterial properties. Functional coatings play an important role in production and life. In recent years, the phenomenon of bacterial infection has frequently occurred in areas with dense cross-flow of people such as buses, subways, and hospitals. Therefore, public instruments, item decoration, etc. require a coating that can effectively antibacterial, so as to reduce the risk of people being infected by bacteria.

[0003] There are mainly two ways of antibacterial. One is to prevent bacteria from attaching through electrostatic repulsion and other means, and the other is to directly kill microorganisms by directly releasing antibacterial active substances and contact sterilization. Among them, the antibacterial agents that directly kill microorganisms include inorganic antibacterial agents and organic antibacterial agents represented by silver-based antibacterial agents and photocatalytic antibacterial agents. Organic antibacterial agents are not friendly to the environment and the human body, photocatalytic antibacterial agents have specific requirements for the environment, while silver-based antibacterial agents, as inorganic antibacterial agents, are environmentally friendly and show good effects in many application scenarios. An antibacterial coating is to directly add an antibacterial agent as a component of the coating to the film-forming substance to form an antibacterial coating, and through various coating methods, the antibacterial coating is coated on the substrate and baked to form an antibacterial coating. The color of the nano silver-based antibacterial agent itself will affect the appearance of the coating, and the silver ion antibacterial agent has poor stability and is prone to cause yellowing of the coating during baking, which also affects the appearance of the coating. Moreover, silver ions are easily released from the coating, resulting in a weakening of its antibacterial effect over time.

[0004] After investigating existing commercial antibacterial coatings, it is found that although traditional antibacterial coatings have antibacterial properties, after different usage cycles, it is impossible to observe and identify whether the antibacterial agent still exists, and it is difficult to meet the user's demand for dynamically understanding and mastering the performance of antibacterial coatings. Summary of the Invention

[0005] In order to solve the above problems existing in the prior art, the purpose of the present invention is to provide a preparation method of a fluorescent antibacterial coating.

[0006] Another purpose of the present invention is to provide a fluorescent antibacterial coating.

[0007] Another purpose of the present invention is to provide an application of a fluorescent antibacterial coating in the preparation of medical display devices, lighting devices, and electrical decoration.

[0008] In order to achieve the above purposes, the present invention provides the following technical solutions:

[0009] A preparation method of a fluorescent antibacterial coating, comprising the following steps:

[0010] S1. Mix the fluorescent antibacterial agent with the powder coating, or mix the fluorescent antibacterial agent with the raw materials of the powder coating, then extrude and grind to obtain the fluorescent antibacterial coating;

[0011] S2. Coat the fluorescent antibacterial coating on the substrate and bake to obtain the fluorescent antibacterial coating;

[0012] The chemical formula of the fluorescent antibacterial agent is Cs 2 Ag 1-x Na x MX 6 or CsAgX 2 ; wherein, 0 ≤ x < 1, M is at least one of In, Bi, and Mn; X is one of Cl, Br, and I.

[0013] In the present invention, the fluorescent antibacterial agent is mixed with the powder coating and baked. After mixing, the resin in the powder coating is tightly combined with the fluorescent antibacterial agent, enabling the continuous synthesis of the fluorescent antibacterial agent in the pure solid-phase coating / coating, reducing the generation of amorphous phase impurities, and improving the crystal phase purity of the fluorescent antibacterial agent. The protective effect and surface self-assembly effect of the powder coating improve the stability of the halide fluorescent antibacterial agent, thereby enhancing the fluorescence performance and long-term antibacterial performance of the fluorescent antibacterial agent.

[0014] Specifically, the chemical formula of the fluorescent antibacterial agent is Cs 2 Ag 1-x Na x MCl 6 or CsAgCl 2 ; wherein, 0 ≤ x < 1, M is at least one of In, Bi, and Mn.

[0015] Specifically, the powder coating is at least one of epoxy powder coating, polyester powder coating, polyacrylic acid powder coating, epoxy-polyester powder coating, polyamide powder coating, polyurethane powder coating, and polytetrafluoroethylene powder coating.

[0016] Preferably, the powder coating is at least one of epoxy powder coating, polyacrylic acid powder coating, epoxy-polyester powder coating, and polytetrafluoroethylene.

[0017] More preferably, the powder coating is polytetrafluoroethylene.

[0018] More specifically, the ratio of the total mass of all metal halides to the volume of the solvent is 1 g: 1 - 3 ml.

[0019] Specifically, in step S1, the fluorescent antibacterial agent accounts for 1 - 55% of the total mass of the fluorescent antibacterial coating.

[0020] Preferably, in the step S1, the fluorescent antibacterial agent accounts for 5-20% of the total mass of the fluorescent antibacterial coating.

[0021] After mixing the fluorescent antibacterial agent with the powder coating, or mixing the fluorescent antibacterial agent with the raw materials of the powder coating, extruding and grinding, there is a tight bonding effect between the powder coating and the fluorescent antibacterial agent, further improving the stability of the fluorescent antibacterial agent.

[0022] Specifically, the preparation method of the fluorescent antibacterial agent includes:

[0023] Grind cesium halide, silver halide, or grind cesium halide, silver halide, and halide of doped metal to obtain the fluorescent antibacterial agent; the doped metal is at least one of Na, In, Bi, and Mn.

[0024] More specifically, in the preparation method of the fluorescent antibacterial agent, a solvent is added during grinding.

[0025] More specifically, the solvent is one of ethyl acetate, ethanol, and cyclohexanol.

[0026] Specifically, sieving is also included in the step S1.

[0027] More specifically, the mesh number of the sieve used during sieving is 160-800 meshes, preferably 160-500 meshes.

[0028] Specifically, the raw materials of the powder coating include polymer, curing agent, and additives.

[0029] More specifically, the curing agent accounts for 4-17% of the total mass of the fluorescent antibacterial coating.

[0030] More specifically, the additives include at least one of leveling agent, degassing agent, defoaming agent, low-temperature additive, brightening agent, and charge-increasing agent.

[0031] More specifically, the curing agent is one of triglycidyl isocyanurate, dicyandiamide, isocyanate, hydroxyalkylamide, imidazole, and isophorone diisocyanate.

[0032] More specifically, the additives account for 2-4% of the total mass of the fluorescent antibacterial coating.

[0033] Specifically, in the step S2, the baking temperature is 130-230 °C.

[0034] More specifically, in the step S2, the baking temperature is 180-210 °C.

[0035] Specifically, in the step S2, the baking time is 5-15 min.

[0036] Specifically, the substrate is at least one of plastic, wood, leather, metal, marble, and glass.

[0037] Preferably, in step S2, the coating method is electrostatic spraying.

[0038] The present invention also protects the fluorescent antibacterial coating prepared by the above preparation method.

[0039] The present invention also protects the application of the above fluorescent antibacterial coating in the preparation of medical display devices, lighting devices, and electrical decorations.

[0040] Compared with the prior art, the present invention has the following beneficial effects:

[0041] (1) The present invention uses a fluorescent antibacterial agent to prepare a powder coating, enabling the continuous synthesis of the fluorescent antibacterial agent in a pure solid-phase coating, reducing the generation of amorphous-phase impurities, and improving the crystalline-phase purity of the fluorescent antibacterial agent. The protective effect of the powder coating and the surface self-assembly effect improve the stability of the halide fluorescent antibacterial agent, thereby enhancing the fluorescence performance and long-term antibacterial performance of the fluorescent antibacterial agent.

[0042] (2) The fluorescent antibacterial coating prepared by the present invention has a high antibacterial rate against Escherichia coli, and the antibacterial rate can reach 99.53% in 1 hour. The presence of the fluorescent antibacterial agent in the coating can be judged by the fluorescence indicativeness of the coating, thereby realizing the dynamic control of the antibacterial performance of the coating.

[0043] (3) The preparation method provided by the present invention is simple to operate, reduces the release of organic substances in the process of the fluorescent antibacterial coating, has a high yield of the fluorescent antibacterial agent, has no special requirements for equipment, has high repeatability, low preparation cost, and can be industrially promoted and used. Description of the Drawings

[0044] Figure 1 It is the XRD pattern of the coating in Example 6, the fluorescent antibacterial agent, and the coating in Comparative Example 1.

[0045] Figure 2 It is the excitation and emission spectra of Example 6 and Comparative Example 1.

[0046] Figure 3 It is the absorption spectra of Example 7 and Comparative Example 1.

[0047] Figure 4 It is the physical diagram of the fluorescent antibacterial coating synthesized by epoxy-polyester in Example 1 under the irradiation of a fluorescent lamp and an ultraviolet lamp, and the substrate used is glass.

[0048] Figure 5 It is the comparison of the fluorescence intensities of the fluorescent antibacterial coatings synthesized from four powder coatings, namely epoxy, epoxy-polyester, acrylic, and PVDF, in Example 2, and the substrate used is an iron sheet.

[0049] Figure 6 The effect diagram of bacteria presented in the petri dish after the bacteria solution was diluted after the coatings of Example 3 and Comparative Example 1 were co-cultured with the bacteria solution for 1 h.

[0050] Figure 7 The antibacterial test result diagram after Example 3 and Comparative Example 1 were stored for 15 days. Specific implementation manners

[0051] The present invention will be further described below in conjunction with embodiments. These embodiments are only used to illustrate the present invention and not to limit the scope of the present invention. For the experimental methods without specific conditions noted in the following embodiments, they are generally carried out according to the conventional conditions in the art or according to the conditions recommended by the manufacturer; for the raw materials, reagents, etc. used, unless otherwise specified, they are all raw materials and reagents that can be obtained from commercial channels such as the conventional market. Any non-substantial changes and substitutions made by those skilled in the art on the basis of the present invention fall within the scope of protection required by the present invention.

[0052] The commercial silver antibacterial agent used in Comparative Example 2: Manufacturer: Pinranjieermei Co., Ltd., Japan, Brand: Zeomic

[0053] Example 1

[0054] A fluorescent antibacterial coating is provided in this example, and its preparation method is as follows:

[0055] S0. According to the molar ratio of each constituent element of Cs:Ag:Bi:Cl = 2:1:1:6, accurately weigh cesium chloride (CsCl), silver chloride (AgCl), and bismuth chloride (BiCl 3 ). Place the above raw materials in an agate mortar, and then add a small amount of ethanol (1 g of raw material, 2 mL of ethanol) and grind for about 30 min until the raw materials of the fluorescent antibacterial agent are dry. The chemical formula of the fluorescent antibacterial agent is Cs 2 AgBiCl 6 .

[0056] S1. Then, put 0.5 g of the fluorescent antibacterial agent and 9.5 g of epoxy-polyester powder coating (48.5% polyester, 48.5% epoxy, 1% leveling agent, 1% charge-increasing agent, 1% benzoin) into a coffee grinder for mechanical mixing, and pass through a 180-mesh sieve to obtain the fluorescent antibacterial powder coating.

[0057] S2. Through electrostatic spraying, spray the above powder coating onto the glass; place the sprayed glass in an oven and bake at 200 °C for 10 min for curing to obtain the antibacterial fluorescent coating.

[0058] Example 2

[0059] Four fluorescent antibacterial coatings are provided in this example, and their preparation methods are as follows:

[0060] S0. According to the molar ratio of each component element Cs:Ag:Na:In:Bi:Cl = 2:0.6:0.4:0.96:0.04:6, accurately weigh cesium chloride (CsCl), silver chloride (AgCl), sodium chloride (NaCl), indium chloride (InCl 3 ), bismuth chloride (BiCl 3 ). Place the above raw materials in an agate mortar, then add a small amount of ethanol (1 g of raw materials, 2 mL of ethanol) and grind for about 30 minutes until the raw materials of the fluorescent antibacterial agent are dry. The chemical formula of the fluorescent antibacterial agent is Cs 2 Ag 0.6 Na 0.4 In 0.96 Bi 0.04 Cl 6 .

[0061] S1. Then, respectively put 0.5 g of the fluorescent antibacterial agent into 9.5 g of epoxy (epoxy 93%, dicyandiamide 4%, leveling agent 1%, charge enhancer 1%, benzoin 1%), epoxy-polyester (polyester 48.5%, epoxy 48.5%, leveling agent 1%, charge enhancer 1%, benzoin 1%), acrylic acid (acrylic acid 80%, isophorone diisocyanate 17%, leveling agent 1%, charge enhancer 1%, benzoin 1%), PVDF powder coating (PVDF 70%, acrylic acid 27%, leveling agent 1%, charge enhancer 1%, benzoin 1%) in a coffee grinder for mechanical mixing, and pass through a 180-mesh sieve to obtain the fluorescent antibacterial powder coating.

[0062] S2. Through electrostatic spraying, spray the above powder coating onto an iron sheet; put the sprayed iron sheet into an oven and bake at 200 °C for 10 minutes for curing to obtain an antibacterial fluorescent coating.

[0063] Example 3

[0064] In this example, a fluorescent antibacterial coating is provided, and its preparation method is as follows:

[0065] S0. According to the molar ratio of each component element Cs:Ag:Cl = 1:1:2, accurately weigh cesium chloride (CsCl) and silver chloride (AgCl). Place the above raw materials in an agate mortar, then add a small amount of ethanol (0.2 g of raw materials, 2 mL of ethanol) and grind for about 30 minutes until the raw materials of the fluorescent antibacterial agent are dry. The chemical formula of the fluorescent antibacterial agent is CsAgCl 2 .

[0066] S1. Then, put 2 g of the fluorescent antibacterial agent and 8 g of epoxy-polyester powder coating (polyester 48.5%, epoxy 48.5%, leveling agent 1%, charge enhancer 1%, benzoin 1%) into a coffee grinder for mechanical mixing, and pass through a 180-mesh sieve to obtain the fluorescent antibacterial powder coating.

[0067] S2. Spray the above powder coating onto the iron sheet by electrostatic spraying; place the sprayed iron sheet in an oven and bake it at 200 °C for 10 min for curing to obtain an antibacterial fluorescent coating.

[0068] Example 4

[0069] In this example, a fluorescent antibacterial coating is provided, and its preparation method is as follows:

[0070] S0. Accurately weigh cesium chloride (CsCl), silver chloride (AgCl), indium chloride (InCl 3 ), and manganese chloride (MnCl 2 ) according to the molar ratio of each component element of Cs:Ag:In:Mn:Cl = 2:1:0.95:0.05:6. Place the above raw materials in an agate mortar, and then add a small amount of ethanol (1 g of raw materials, 2 mL of ethanol) and grind for about 30 min until the raw materials of the fluorescent antibacterial agent are dry. The chemical formula of the fluorescent antibacterial agent is Cs 2 AgIn 0.95 Mn 0.05 Cl 6 .

[0071] S1. Then put 0.5 g of the fluorescent antibacterial agent and 9.5 g of epoxy powder coating (93% epoxy, 4% dicyandiamide, 1% leveling agent, 1% charge enhancer, 1% benzoin) into a coffee grinder for mechanical mixing, and pass through a 180-mesh sieve to obtain the fluorescent antibacterial powder coating.

[0072] S2. Spray the above powder coating onto the aluminum sheet by electrostatic spraying; place the sprayed aluminum sheet in an oven and bake it at 200 °C for 10 min for curing to obtain an antibacterial fluorescent coating.

[0073] Example 5

[0074] In this example, a fluorescent antibacterial coating is provided, and its preparation method is as follows:

[0075] S0. Accurately weigh cesium chloride (CsCl), silver chloride (AgCl), bismuth chloride (BiCl 3 ) according to the molar ratio of each component element of Cs:Ag:Bi:Cl = 2:1:1:1:6. Place the above raw materials in an agate mortar, and then add a small amount of ethanol (1 g of raw materials, 2 mL of ethanol) and grind for about 30 min until the raw materials of the fluorescent antibacterial agent are dry. The chemical formula of the fluorescent antibacterial agent is Cs 2 AgBiCl 6 .

[0076] S1. Then, 0.5 g of the fluorescent antibacterial agent, 9.5 g of acrylic resin, isophorone diisocyanate, and additives (80% acrylic acid, 17% isophorone diisocyanate, 1% leveling agent, 1% charge enhancer, 1% benzoin) are mixed by a coffee grinder, extruded through an extruder (the extrusion temperature is 125 °C), ground by ACM, and then passed through a 180-mesh sieve to obtain the fluorescent antibacterial coating;

[0077] S2. Through electrostatic spraying, the above coating is applied to a heated glass plate; the sprayed glass plate is placed in an oven and baked at 200 °C for 10 min to obtain the antibacterial fluorescent coating.

[0078] Example 6

[0079] In this example, a fluorescent antibacterial coating is provided, and its preparation method is as follows:

[0080] S0. According to the molar ratio of each constituent element Cs:Ag:Na:In:Bi:Cl = 2:0.2:0.8:0.96:0.04:6, accurately weigh cesium chloride (CsCl), silver chloride (AgCl), sodium chloride (NaCl), indium chloride (InCl 3 ), bismuth chloride (BiCl 3 ). Place the above raw materials in an agate mortar, and then add a small amount of cyclohexanol (1 g of raw materials, 2 mL of cyclohexanol) and grind for about 30 min until the raw materials of the fluorescent antibacterial agent are dry. The chemical formula of the fluorescent antibacterial agent is Cs 2 Ag 0.2 Na 0.8 In 0.96 Bi 0.04 Cl 6 .

[0081] S1. Then, 0.5 g of the fluorescent antibacterial agent and 9.5 g of epoxy-polyester powder coating (48.5% polyester, 48.5% epoxy, 1% leveling agent, 1% charge enhancer, 1% benzoin) are mechanically mixed in a coffee grinder and passed through a 180-mesh sieve to obtain the fluorescent antibacterial powder coating.

[0082] S2. Through electrostatic spraying, the above powder coating is sprayed onto the heated glass; the sprayed glass is placed in an oven and baked at 200 °C for 10 min for curing to obtain the antibacterial fluorescent coating.

[0083] Example 7

[0084] In this example, a fluorescent antibacterial coating is provided, and its preparation method is as follows:

[0085] S0. Weigh accurately cesium chloride (CsCl), silver chloride (AgCl), sodium chloride (NaCl), indium chloride (InCl 3 ), and bismuth chloride (BiCl 3 ) according to the molar ratio of each component element Cs:Ag:Na:In:Bi:Cl = 2:0.2:0.8:0.96:0.04:6. Place the above raw materials in an agate mortar, then add a small amount of ethanol (1 g of raw materials, 2 mL of ethanol) and grind for about 30 min until the raw materials of the fluorescent antibacterial agent are dry. The chemical formula of the fluorescent antibacterial agent is Cs 2 Ag 0.2 Na 0.8 In 0.96 Bi 0.04 Cl 6 .

[0086] S1. Then put 1 g of the fluorescent antibacterial agent and 9 g of epoxy-polyester powder coating (48.5% polyester, 48.5% epoxy, 1% leveling agent, 1% charge enhancer, 1% benzoin) into a coffee grinder for mechanical mixing, and pass through a 180-mesh sieve to obtain the fluorescent antibacterial powder coating.

[0087] S2. Spray the above powder coating onto an iron sheet by electrostatic spraying; put the sprayed iron sheet into an oven and bake at 200 °C for 10 min for curing to obtain an antibacterial fluorescent coating.

[0088] Example 8

[0089] In this example, a fluorescent antibacterial coating is provided, and its preparation method is as follows:

[0090] S0. Weigh accurately cesium chloride (CsCl), silver chloride (AgCl), sodium chloride (NaCl), indium chloride (InCl 3 ), and bismuth chloride (BiCl 3 ) according to the molar ratio of each component element Cs:Ag:Na:In:Bi:Cl = 2:0.2:0.8:0.96:0.04:6. Place the above raw materials in an agate mortar, then add a small amount of ethanol (1 g of raw materials, 2 mL of ethanol) and grind for about 30 min until the raw materials of the fluorescent antibacterial agent are dry. The chemical formula of the fluorescent antibacterial agent is Cs 2 Ag 0.2 Na 0.8 In 0.96 Bi 0.04 Cl 6 .

[0091] S1. Then add 2 g of the fluorescent antibacterial agent and 8 g of epoxy powder coating (93% epoxy, 4% dicyandiamide, 1% leveling agent, 1% charge enhancer, 1% benzoin) to a coffee grinder for mechanical mixing, and pass through a 180-mesh sieve to obtain the fluorescent antibacterial powder coating.

[0092] S2. Spray the above powder coating onto the iron sheet by electrostatic spraying; place the sprayed iron sheet in an oven and bake it at 200 °C for 10 min for curing to obtain an antibacterial fluorescent coating.

[0093] Comparative Example 1

[0094] This comparative example provides an epoxy-polyester coating, and its preparation method is as follows:

[0095] Spray 10 g of epoxy-polyester powder coating onto the glass by electrostatic spraying; place the sprayed glass in an oven and bake it at 200 °C for 10 min for curing to obtain an epoxy-polyester coating.

[0096] Comparative Example 2

[0097] The difference between this comparative example and Example 3 is that the fluorescent antibacterial agent is replaced with commercial silver antibacterial, and its preparation method is as follows:

[0098] S1. Put 2 g of commercial silver antibacterial agent and 8 g of epoxy-polyester powder coating (48.5% polyester, 48.5% epoxy, 1% leveling agent, 1% charge enhancer, 1% benzoin) into a coffee grinder for mechanical mixing, and pass through a 180-mesh sieve to obtain fluorescent antibacterial powder coating.

[0099] S2. Spray the above powder coating onto the iron sheet by electrostatic spraying; place the sprayed iron sheet in an oven and bake it at 200 °C for 10 min for curing to obtain an antibacterial coating.

[0100] Performance Test

[0101] Figure 1 XRD patterns of the coating, fluorescent antibacterial agent in Example 6, and the coating in Comparative Example 1. It was measured using an X-ray powder diffractometer of model D8-ADVANCE from Bruker Corporation, Germany, and compared with the standard card Cs 2 NaInCl 6 For comparison, "!" in the figure indicates non-Cs 2 NaInCl 6 crystal phase. It can be seen that a purer crystal phase is formed by the fluorescent antibacterial agent in the coating, which indicates that the mixing of the fluorescent antibacterial agent with the powder coating can improve the crystal phase purity of the fluorescent antibacterial agent, and the fluorescent antibacterial agent provided by the present invention can be synthesized in a pure solid-phase coating.

[0102] Figure 2Emission (Em) and excitation (Ex) spectra for Example 6. The instrument used for testing was an Edinburgh Instruments FLS1000 steady state and transient fluorescence spectrometer, and the excitation light source was a xenon lamp. From the excitation spectrum, it can be seen that the optimal excitation wavelength is 365 nm. From the emission spectrum, it can be seen that the emission peak is at 630 nm and the emission color is yellow.

[0103] Figure 3 Absorption spectra for the coatings of Example 7 and Comparative Example 1. The test range was 200 - 900 nm. The sample of Example 3 had a characteristic absorption peak near 380 nm.

[0104] Figure 4 Photographs of the fluorescent antibacterial coating synthesized from epoxy - polyester in Example 1 under daylight and ultraviolet light irradiation. This shows that the fluorescent antibacterial coating in Example 1 emits yellow fluorescence under ultraviolet light irradiation.

[0105] Figure 5 Comparison of fluorescence intensities of fluorescent antibacterial coatings prepared from four powder coatings, namely epoxy, epoxy - polyester, acrylic, and PVDF in Example 2, with the same thickness (the fluorescent antibacterial agent accounted for 5 wt% of the fluorescent antibacterial powder coating). The substrate used was an aluminum sheet, and the test instrument was a SE - Pro fiber optic spectrometer from Shanghai Wenyi Optoelectronic Technology Co., Ltd. The excitation light source was a 365 nm ultraviolet lamp. From the figure, it can be seen that the fluorescent antibacterial coating prepared from PVDF has a greater fluorescence intensity compared to other polymers. This is because PVDF contains halogen groups, and the fluorine element on the polymer enhances the energy transfer of the fluorescent antibacterial agent, thereby improving the fluorescence intensity and light conversion ability of the fluorescent antibacterial agent.

[0106] Figure 6 Antibacterial test results graphs for Example 3 and Comparative Examples 1 and 2. Escherichia coli was used for the test. After the bacterial solution was cultured on the coating for 1 h, it was diluted 10 - fold, 100 - fold, 1000 - fold, and 10000 - fold respectively and then spread on the culture medium. It was calculated that the antibacterial rate of the fluorescent antibacterial coating in Example 3 was 99.53%, and the antibacterial rate of the commercial silver antibacterial agent coating was 92.83%. This shows that the antibacterial performance of the fluorescent antibacterial coating provided by the present invention is superior to that of the antibacterial coating prepared from ordinary commercial silver antibacterial agents.

[0107] Figure 7 Antibacterial test results graphs for Example 3 and Comparative Example 1 after storage for 15 days. Escherichia coli was used for the test. After the bacterial solution was cultured on the coating for 1 h, it was diluted 10 - fold, 100 - fold, 1000 - fold, and 10000 - fold respectively and then spread on the culture medium. It was calculated that the antibacterial rate of the fluorescent antibacterial coating in Example 3 after storage for 15 days was 99.25%. This shows that the fluorescent antibacterial coating provided by the present invention has long - term antibacterial properties.

[0108] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation manners here. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A method for preparing a fluorescent antibacterial coating, characterized in that: The following steps are involved: S1. The fluorescent antibacterial agent is mixed with the powder coating, or the fluorescent antibacterial agent is mixed with the raw materials of the powder coating and then extruded and ground to obtain a fluorescent antibacterial coating; S2. applying the fluorescent antibacterial coating on the substrate and baking to obtain the fluorescent antibacterial coating; The chemical formula of the fluorescent antibacterial agent is Cs2Ag 1-x Na x MX6 or CsAgX2; wherein 0≤x<1, M is at least one of In, Bi, and Mn; and X is at least one of Cl, Br, and I.

2. The preparation method according to claim 1, characterized in that: The chemical formula of the fluorescent antibacterial agent is Cs2Ag 1- x Na x MCl6 or CsAgCl2; wherein 0≤x<1, and M is at least one of In, Bi, and Mn.

3. The preparation method according to claim 1, characterized in that: The powder coating is at least one of epoxy powder coating, polyester powder coating, polyacrylic acid powder coating, epoxy-polyester powder coating, polyamide powder coating, polyurethane powder coating, and polyvinylidene fluoride powder coating.

4. The preparation method according to claim 1, characterized in that: The fluorescent antibacterial agent accounts for 1-55% of the total mass of the fluorescent antibacterial coating.

5. The preparation method according to claim 1, characterized in that: The preparation method of the fluorescent antibacterial agent comprises: The fluorescent antibacterial agent is obtained by grinding cesium halide and silver halide or grinding cesium halide, silver halide and halide doped with metal, wherein the doped metal is at least one of Na, In, Bi and Mn.

6. The preparation method according to claim 1, characterized in that: The extrusion temperature is 100-250°C.

7. The preparation method according to claim 1, characterized in that: In the step S2, the baking temperature is 130-230°C.

8. The preparation method according to claim 1, characterized in that: In step S2, the baking time is 5 to 15 minutes.

9. The fluorescent antibacterial coating prepared by the preparation method according to any one of claims 1 to 8.

10. Use of the fluorescent antibacterial coating as claimed in claim 9 in the preparation of medical display devices, lighting devices, and electrical appliance decorations.

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