Functional coating as well as preparation method and equipment thereof

Abstract

The invention relates to a functional coating and a preparation method and equipment thereof, the functional coating comprises a functional particle, the functional particle has a core-shell structure, and the core-shell structure comprises a core body and a shell; the core body comprises antibacterial particles and has a hollow structure; the shell is coated on the surface of the core body, and the shell has a porous structure. The functional coating has dual effects of antibiosis and antireflection, the core body can release antibacterial ions, the shell has a porous structure and can play a role in slowly releasing the antibacterial ions, so that the functional particles have the antibacterial characteristic, and meanwhile, the core body has a hollow structure, so that the functional particles have the antibacterial characteristic. And the functional particles have the antireflection characteristic.

Description

Technical Field

[0001] The present application relates to the technical field of functional materials, and in particular to a functional coating and a preparation method and equipment thereof. Background Art

[0002] The reflection of natural light in daily life brings a lot of trouble to people. For example, photovoltaic glass has a low transmittance due to light reflection, resulting in insufficient light utilization. The windshield of a car will affect the field of vision due to light reflection. Display windows and mobile phone screens will affect viewing due to light reflection. Anti-reflection film can inhibit optical reflection and increase light transmittance, so the demand for anti-reflection coating is increasing. With the popularization of electronic products, smart display screens such as TVs, mobile phones, and tablets have become new application areas for anti-reflection film. Moreover, with more and more human-computer interaction scenarios, especially the frequent contact between display screens in public places, the risk of transmission of bacteria and viruses on their surfaces has also attracted widespread attention. Therefore, the demand for antibacterial film has also increased sharply.

[0003] Related technologies usually integrate antibacterial coating and anti-reflective coating to form a multilayer film structure to meet the requirements of anti-reflection and antibacterial at the same time. However, the antibacterial coating is usually set at the next layer or two layers below the top layer, which is not conducive to the release or activation of antibacterial ions. In addition, the antibacterial particles used in the preparation process of the antibacterial coating are prone to agglomeration in the matrix, which affects the antibacterial effect. Summary of the invention

[0004] In view of this, an embodiment of the present application provides a functional coating having dual functions of antibacterial and anti-reflection, a preparation method thereof, and a device using the functional coating.

[0005] In order to achieve the above object, the present application provides a functional coating, wherein the functional coating comprises functional particles, wherein the functional particles have a core-shell structure, and the core-shell structure comprises:

[0006] A core body, comprising antibacterial particles, wherein the core body has a hollow structure; and

[0007] The shell is coated on the surface of the core body, and the shell has a porous structure.

[0008] In some embodiments, the antibacterial particles include zinc, and the shell includes silicon.

[0009] In some embodiments, the antimicrobial particles include zinc oxide, and the shell includes silicon oxide.

[0010] In some embodiments, the hollow ratio of the functional particles is greater than 40%;

[0011] The outer diameter of the functional particle ranges from 80nm to 100nm, and the inner diameter of the core body ranges from 60nm to 80nm.

[0012] In some embodiments, the functional particle further comprises:

[0013] The modification layer is located on the surface of the shell, the modification layer is connected to the shell through a chemical bond, and the modification layer includes a silane coupling agent.

[0014] In some embodiments, the functional coating further comprises a substrate layer, the functional particles are distributed in the substrate layer, and zinc ions are distributed in the substrate layer.

[0015] In some embodiments, the substrate layer includes a resin polymer, and the modification layer is connected to the resin polymer via a chemical bond.

[0016] In some embodiments, the resin polymer includes at least one of an acrylic polymer and an epoxy polymer.

[0017] The present application provides a method for preparing a functional coating, the method for preparing the functional coating comprising:

[0018] Providing organic matter templates;

[0019] Adsorbing antibacterial particles using the organic template to form initial core-shell particles in which the organic template is coated by the antibacterial particles;

[0020] forming a shell on the surface of the initial core-shell particles, wherein the shell has a porous structure; and

[0021] The organic template is removed to form functional particles with a core-shell structure, wherein the core-shell structure includes a core body and the shell coated on the surface of the core body, the core body includes the antibacterial particles, and the core body has a hollow structure.

[0022] The present application provides a device, comprising a substrate and the functional coating as described above, wherein the functional coating is disposed on at least one side of the substrate.

[0023] The present application provides a functional coating and a preparation method and device thereof, wherein the functional coating includes functional particles, the functional particles have a core-shell structure, including a core body and an outer shell, wherein the core body includes antibacterial particles and has a hollow structure, and the outer shell has a porous structure. The functional coating has the dual effects of antibacterial and anti-reflection, wherein the core body can release antibacterial ions, the outer shell has a porous structure and can play a role in slowly releasing the antibacterial ions, so that the functional particles have antibacterial properties, and the antibacterial particles are arranged on the inner wall of the outer shell, which can avoid the agglomeration problem caused by the direct dispersion of the antibacterial particles, and the core body has a hollow structure, so that the functional particles form a hollow core-shell structure as a whole, which can reduce the refractive index of the material and have anti-reflection properties. The functional coating of the present application can achieve antibacterial and anti-reflection effects at the same time by using a single-layer coating, avoids the stacking of multi-layer structures, does not require complex processing technology, and ensures that the antibacterial ions can effectively penetrate into the interactive screen surface of the device to achieve a good antibacterial effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic diagram of the structure of a functional particle provided in an embodiment of the present application;

[0025] Figure 2 is a schematic structural diagram of a functional coating provided in an embodiment of the present application;

[0026] Figure 3 is a schematic diagram of a preparation process of a functional particle provided in an embodiment of the present application;

[0027] Figure 4 It is a structural schematic diagram of a device provided in an embodiment of the present application.

[0028] Description of reference numerals:

[0029] 100, functional coating; 101, substrate layer; 110, functional particles; 111, core; 112, shell; 113, modification layer; 120, organic template; 121, polyacrylic acid; 200, substrate. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0031] The present application provides a functional coating 100, wherein the functional coating 100 includes functional particles 110. Figure 1The functional particle 110 has a core-shell structure, and the core-shell structure includes a core 111 and a shell 112. The core 111 includes antibacterial particles, and the core 111 has a hollow structure; the shell 112 is coated on the surface of the core 111, and the shell 112 has a porous structure.

[0032] In the present application, the functional particles 110 have the dual properties of antibacterial and anti-reflective, so that a single layer of the functional coating 100 can have the dual effects of antibacterial and anti-reflective, avoiding the need in the current related technology to integrate antibacterial coatings and anti-reflective coatings to form a multi-layer stacking structure to simultaneously meet the antibacterial and anti-reflective effects, thereby simplifying the process.

[0033] The functional particle 110 of the present application includes a core 111 and a shell 112. The material of the core 111 includes antibacterial particles, so it can release antibacterial ions, and the antibacterial ions act on bacteria to achieve a sterilization effect. The shell 112 has a porous structure, which can play a role in slowly releasing the antibacterial ions, and can ensure that the antibacterial ions effectively penetrate into the interactive screen surface of the device, thereby achieving a better antibacterial effect.

[0034] In addition, the core 111 has a hollow structure, so that the functional particle 110 forms a hollow core-shell structure as a whole. The introduction of air through the hollow structure can reduce the refractive index of the functional particle 110, thereby obtaining a low-refractive-index functional coating 100 material, and realizing the anti-reflection property of the functional coating 100. At the same time, due to the formation of the hollow structure, the antibacterial particles are distributed on the inner wall of the shell 112, which can avoid the agglomeration problem caused by the direct dispersion of the antibacterial particles, and the antibacterial particles are evenly distributed on the inner wall of the shell 112, which is conducive to the uniform release of the antibacterial particles, and further improves the antibacterial effect of the functional coating 100.

[0035] In some embodiments, the antibacterial particles may contain zinc, which has significant antibacterial properties, is environmentally friendly, and safe to use. The antibacterial particles may be metal compounds containing zinc, such as zinc oxide (ZnO), but are not limited thereto.

[0036] Furthermore, the antibacterial particles can be nano zinc oxide, which has the characteristics of small particle size and large specific surface area. Nano zinc oxide kills bacteria through multiple mechanisms such as releasing zinc ions, generating reactive oxygen species, and electrostatically interacting with bacterial cell walls. In addition, zinc ions can also interfere with bacterial enzyme activity and block their metabolic pathways, thereby effectively inhibiting bacterial reproduction, thereby playing a role in inhibiting bacteria.

[0037] In some embodiments, the shell 112 may include silicon. The shell 112 may be formed into a porous structure by an inorganic material containing silicon. The inorganic material containing silicon may be, for example, silicon oxide (SiO 2 ), but is not limited thereto.

[0038] Furthermore, the shell 112 includes nano-silicon oxide. By forming a porous nano-silicon oxide shell 112 on the surface of the core 111, on the one hand, the porous structure of the shell 112 can play a role in slowly releasing the antibacterial ions, and on the other hand, the silicon oxide shell 112 has a certain strength and can protect and support the core 111. The antibacterial particles are distributed on the inner wall of the shell 112, which can prevent the antibacterial particles from agglomerating and affecting the antibacterial effect.

[0039] In some other embodiments, the antibacterial particles may also be other commonly used inorganic or organic antibacterial particles, and the shell 112 may also be formed of other porous materials, which is not limited here.

[0040] In the present application, the anti-reflection property of the functional coating 100 depends on the hollowness of the functional particle 110 , and the hollowness of the functional particle 110 is related to the inner diameter of the core 111 and the outer diameter of the functional particle 110 .

[0041] In some embodiments, the hollow ratio of the functional particles 110 may be greater than 40%, so that the functional coating 100 can obtain a better anti-reflection effect.

[0042] Furthermore, the inner diameter size range of the core body 111 is 60nm to 80nm, and the outer diameter size range of the functional particle 110 is 80nm to 100nm. When the inner diameter size of the core body 111, the outer diameter size of the functional particle 110 and the hollow ratio of the functional particle 110 are within the above range, the functional particle 110 has a lower reflectivity, thereby enabling the functional coating 100 to obtain a better anti-reflection effect.

[0043] In some embodiments, the thickness of the core 111 is in the range of 5 nm to 10 nm, and the thickness of the shell 112 is in the range of 5 nm to 20 nm. In the present application, the thickness of the core 111 and the thickness of the shell 112 can be adjusted respectively to obtain hollow functional particles 110 of different sizes to meet the application of the functional coating 100 in different devices and different scenarios.

[0044] In some embodiments, the functional particle 110 further includes a modification layer 113, the modification layer 113 is located on the surface of the shell 112, and the modification layer 113 includes a silane coupling agent, such as a silane coupling agent containing a double bond, an epoxy group or an amino group, but is not limited thereto. Specifically, the surface of the shell 112 can be modified by a silane coupling agent, and a film layer containing a silane coupling agent is formed on the surface of the shell 112, wherein the silane coupling agent contains two parts, a siloxy group and an organic functional group, wherein the siloxy part is connected to the silicon oxide shell 112 through a Si-O-Si bond, and the organic functional group part contains a double bond, an epoxy group or an amino group, and can react or interact with an organic material.

[0045] In some embodiments, please refer to the Figure 2 The functional coating 100 further includes a substrate layer 101, in which the functional particles 110 are distributed, and in which zinc ions are distributed. Since the functional particles 110 can release antibacterial zinc ions, zinc ions are distributed in the substrate layer to achieve the antibacterial effect of the functional coating 100.

[0046] In some embodiments, the substrate layer 101 includes a resin polymer, and the resin polymer includes at least one of an acrylic polymer and an epoxy resin polymer. The resin polymer is formed by curing and cross-linking a resin monomer.

[0047] It can be understood that the functional coating 100 is formed by mixing the functional particles 110, the resin monomer, the initiator, the auxiliary agent, etc. and then curing them.

[0048] The resin monomer includes at least one of an acrylic resin monomer and an epoxy resin monomer, for example, a UV-curable acrylic resin monomer or an epoxy resin monomer, such as 1,6-hexanediol diacrylate, 1,9-nonanediol diacrylate, dipentaerythritol hexaacrylate, tripropylene glycol diacrylate, trimethylolpropane triacrylate, epoxy acrylate, and polyurethane acrylate.

[0049] When the resin monomer includes an acrylic resin monomer, the modification layer 113 may select a silane coupling agent containing a double bond such as allyloxytrimethylsilane, vinyltriethoxysilane, methylvinyldichlorosilane, γ-methacryloxypropyltrimethoxysilane, etc.; when the resin monomer includes an epoxy resin monomer, the modification layer 113 may select a silane coupling agent containing an epoxy group such as γ-methacryloxypropyltrimethoxysilane, but is not limited thereto.

[0050] In the present application, the functional particle 110 is mixed with the resin monomer and other materials to form a coating glue, so as to facilitate the process coating to form the functional coating 100. Among them, the modified layer 113 on the surface of the functional particle 110 includes a silane coupling agent containing double bonds or epoxy groups. The double bonds or epoxy groups in the silane coupling agent are similar to the double bonds or epoxy groups in the resin monomer and are compatible, which is conducive to the uniform mixing of the functional particle 110 and the resin monomer, and avoids the self-agglomeration of the functional particle 110; the double bonds or epoxy groups in the modified layer 113 on the surface of the functional particle 110 can participate in bonding during the curing and cross-linking process of the resin monomer, and the modified layer is connected to the resin polymer through chemical bonds, which can improve the compatibility of the functional particle 110 and the resin polymer, avoid phase separation, etc., and can further improve the uniform dispersion of the functional particle 110 in the substrate layer 101, and improve the antibacterial and anti-reflection effect of the functional coating 100.

[0051] The initiator may include a UV light initiator or a polymerization initiator, etc., for promoting the curing and cross-linking reaction of the resin monomer.

[0052] The auxiliary agent may include one or more of a hyperdispersant, an antioxidant, a surfactant, a stabilizer, etc., but is not limited thereto.

[0053] In some embodiments, during the preparation of the functional coating 100, the functional particles 110 account for 10% to 60% of the total solid mass of the functional particles 110, the resin monomer, the initiator and the auxiliary agent. When the content of the functional particles 110 in the functional coating 100 is within the above range, the functional coating 100 has a good antibacterial and anti-reflective effect. When the content of the functional particles 110 is too low, the antibacterial and anti-reflective effect of the functional coating 100 will be poor; when the content of the functional particles 110 is too high, the hardness and anti-friction properties of the functional coating 100 will be affected.

[0054] The present application also provides a method for preparing a functional coating 100, please refer to Figure 3 , the preparation method of the functional coating 100 comprises:

[0055] 1. Preparation of functional particles 110:

[0056] S1-1. Provide an organic template 120.

[0057] The organic template 120 includes a polyacrylic acid (PAA) template, such as a PAA-NH3 template.

[0058] Specifically, polyacrylic acid 121 (PAA) and ammonia water (NH3) can be fully mixed, and then solvent ethanol is added to obtain a PAA-NH3 template dispersion.

[0059] S1-2, using the organic template 120 to adsorb antibacterial particles to form initial core-shell particles in which the organic template 120 is covered by the antibacterial particles.

[0060] Wherein, the antibacterial particles may be zinc oxide.

[0061] Specifically, zinc acetate can be dissolved in ethanol and then slowly added dropwise to the PAA-NH3 template dispersion, and stirred continuously for several hours at a certain temperature to promote the growth of zinc oxide particles on the PAA-NH3 template, thereby forming initial core-shell particles with the PAA-NH3 template as the core and zinc oxide as the shell.

[0062] S1-3, forming a shell 112 on the surface of the initial core-shell particles, wherein the shell 112 has a porous structure.

[0063] The shell 112 may be made of silicon oxide.

[0064] Specifically, tetraethyl silicate (TEOS) is added dropwise to the solution after the reaction in step S1-2, and the mixture is stirred and reacted at room temperature for several hours to form a porous silicon oxide shell 112 on the surface of the initial core-shell particles.

[0065] S1-4, removing the organic template 120 to form a functional particle 110 with a core-shell structure, wherein the core-shell structure includes a core 111 and a shell 112 coated on the surface of the core 111, and the core 111 includes the antibacterial particle zinc oxide and has a hollow structure.

[0066] Specifically, the solution after the reaction in step S1-3 is filtered or centrifuged to obtain a precipitate, and then the precipitate is washed with deionized water several times to remove the PAA-NH3 template to obtain a hollow structured zinc oxide / silicon oxide particle precipitate, and then dried at 100-120° C. to obtain a solid powder, that is, the functional particle 110 is obtained.

[0067] In some embodiments, before step S1-4, the method further includes the following steps:

[0068] A modification layer 113 is formed on the surface of the shell 112 .

[0069] The modified layer 113 may be a silane coupling agent, which is connected to the silicon oxide shell 112 via a Si—O—Si bond.

[0070] Furthermore, the method for preparing the functional coating 100 further includes:

[0071] 2. Preparation and coating of coating glue:

[0072] S2-1, adding the solid powder of the functional particles 110 obtained in step S1-4, resin monomers, initiators, additives and other components into a solvent, and fully shaking or ultrasonically mixing to obtain a coating glue solution.

[0073] The resin monomer includes an acrylic resin monomer or an epoxy resin monomer. The initiator includes a UV light initiator or a polymerization initiator. The auxiliary agent includes one or more of a hyperdispersant, an antioxidant, a surfactant, a stabilizer, etc. The solvent includes one or more of ethyl acetate, butyl acetate, methyl isobutyl ketone, propylene glycol methyl ether acetate, isopropyl alcohol, etc.

[0074] S2-2, coating the coating glue obtained in step S2-1 on the surface of the substrate, and then drying to remove the solvent to form a uniform film layer, and then performing an ultraviolet (UV) curing process to obtain a functional coating 100 with antibacterial and anti-reflective properties.

[0075] The coating method of the coating glue solution includes dipping, pulling, spraying or scraping.

[0076] In the present application, the preparation process of the functional coating 100 is simple, the operating conditions are mild, and the raw material cost is low. During the preparation process, the size of the PAA-NH3 template can be controlled by adjusting the content of polyacrylic acid 121 and ammonia water, thereby controlling the hollow rate of the functional particle 110, and the thickness of the zinc oxide core 111 and the thickness of the silicon oxide shell 112 can be respectively adjusted by adjusting the content of the added zinc acetate and tetraethyl silicate, thereby obtaining the functional particles 110 with hollow core-shell structures of different sizes.

[0077] In a specific embodiment, please refer to Figure 3 , the preparation method of the functional coating 100 comprises:

[0078] 1. Preparation of functional particles 110:

[0079] S1-1, after mixing 0.1g-1g of polyacrylic acid 121 with 10ml-20ml of ammonia water, add dropwise to 300mL of ethanol and stir for 3h to obtain a PAA-NH3 template dispersion;

[0080] S1-2, dissolving 0.5 g to 1.5 g of zinc acetate in ethanol, and then slowly dropping it into the PAA-NH3 template dispersion, stirring continuously at 50-70° C. for several hours, growing zinc oxide particles on the PAA-NH3 template, and forming initial core-shell particles with the PAA-NH3 template as the core and zinc oxide as the shell;

[0081] S1-3, adding 1 ml-2 mL of an ethanol solution of tetraethyl silicate to the solution after the reaction in step S1-2, stirring and reacting at room temperature for several hours, to form a porous silicon oxide shell 112 on the surface of the initial core-shell particles;

[0082] S1-4. Add γ-methacryloxypropyltrimethoxysilane equivalent to 10%-50% of the molar amount of tetraethyl silicate to the solution after the reaction in step S1-3, and continue stirring for several hours to form a modified layer 113 on the surface of the shell 112; filter or centrifuge the solution after the reaction to obtain a precipitate, then wash the precipitate with deionized water and ethanol several times to remove the PAA-NH3 template, obtain a hollow structure zinc oxide / silicon oxide particle precipitate, and then dry it at 120°C to obtain a solid powder to obtain the functional particle 110.

[0083] 2. Preparation and coating of coating glue:

[0084] S2-1, mixing the solid powder of the functional particle 110, acrylic resin monomer, UV photoinitiator and auxiliary agent, wherein the content of the functional particle 110 accounts for 10%-60% of the total solids, the content of the acrylic resin monomer accounts for 40%-90% of the total solids, the content of the UV initiator is 0.5-5% of the acrylic resin monomer, and the content of the auxiliary agent and other ingredients is 0.5%-5% of the total solids; then adding a solvent to make the total solid content 1-10%, fully oscillating or ultrasonically mixing, to obtain a coating glue solution;

[0085] S2-2, coating the coating glue obtained in step S2-1 on the substrate by dip coating, spray coating or scraping coating; then placing the substrate coated with the coating glue on a hot table, heating it to 80-100°C, drying it for 5 minutes, removing the solvent to form a uniform film layer; finally, performing a UV curing process to obtain the functional coating 100.

[0086] This application also provides a device, please refer to the photo Figure 4 The device includes a substrate 200 and the functional coating 100 as described above, and the functional coating 100 is disposed on at least one side of the substrate 200 .

[0087] The functional coating 100 of the present application can be directly coated on the substrate 200 of the device, or the functional coating 100 can be first coated on the substrate 200 to form a functional film and then attached to the surface of the device. The substrate 200 includes an inorganic substrate or an organic flexible substrate, and the inorganic substrate can be glass, silicon wafer or metal surface, etc.; the organic flexible substrate can be an organic resin substrate, such as polymethyl methacrylate film (PMMA), triacetyl cellulose film (TAC), polyethylene terephthalate (PET) or acrylaldehyde film (AC), etc., but is not limited thereto.

[0088] In the present application, the device includes a solar panel, a display screen, an optical film, a display glass, a car window, etc., and the functional coating 100 is disposed on the surface of the device to provide antibacterial and anti-reflective effects. Specifically, the functional coating 100 can be disposed on the surface of a solar panel, a display screen, an optical film, a display glass, a car window, etc., but is not limited thereto.

[0089] The present application provides a functional coating and a preparation method and device thereof, wherein the functional coating includes functional particles, the functional particles have a core-shell structure, including a core body and an outer shell, wherein the core body includes antibacterial particles and has a hollow structure, and the outer shell has a porous structure. The functional coating has the dual effects of antibacterial and anti-reflection, wherein the core body can release antibacterial ions, the outer shell has a porous structure and can play a role in slowly releasing the antibacterial ions, so that the functional particles have antibacterial properties, and the antibacterial particles are arranged on the inner wall of the outer shell, which can avoid the agglomeration problem caused by the direct dispersion of the antibacterial particles, and the core body has a hollow structure, so that the functional particles form a hollow core-shell structure as a whole, which can reduce the refractive index of the material and have anti-reflection properties. The functional coating of the present application can achieve antibacterial and anti-reflection effects at the same time by using a single-layer coating, avoiding the stacking of multi-layer structures, and does not require complex processing technology, and can ensure that the antibacterial ions can effectively penetrate into the interactive screen surface of the device to achieve a good antibacterial effect.

[0090] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0091] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0092] The embodiments, implementation methods and related technical features of the present application can be combined and replaced with each other without conflict.

[0093] The above are only preferred embodiments of the present application and do not constitute any form of limitation to the present application. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of the technical solution of the present application.

Claims

1. A functional coating, characterized in that: The invention comprises a functional particle, wherein the functional particle has a core-shell structure, and the core-shell structure comprises: A core body, comprising antibacterial particles, wherein the core body has a hollow structure; and The shell is coated on the surface of the core body, and the shell has a porous structure.

2. The functional coating according to claim 1, characterized in that The antibacterial particles contain zinc, and the shell contains silicon.

3. The functional coating according to claim 2, characterized in that The antibacterial particles include zinc oxide, and the shell includes silicon oxide.

4. The functional coating according to claim 1, characterized in that: The hollow ratio of the functional particles is greater than 40%; The outer diameter of the functional particle ranges from 80nm to 100nm, and the inner diameter of the core body ranges from 60nm to 80nm.

5. The functional coating according to claim 1, characterized in that: The functional particles also include: The modification layer is located on the surface of the shell, the modification layer is connected to the shell through a chemical bond, and the modification layer includes a silane coupling agent.

6. The functional coating according to claim 5, characterized in that: The functional coating further comprises a substrate layer, the functional particles are distributed in the substrate layer, and zinc ions are distributed in the substrate layer.

7. The functional coating according to claim 6, characterized in that The substrate layer includes a resin polymer, and the resin polymer is connected to the modification layer through a chemical bond.

8. The functional coating according to claim 7, characterized in that: The resin polymer includes at least one of an acrylic polymer and an epoxy polymer.

9. A method for preparing a functional coating, characterized in that: include: Providing organic matter templates; Adsorbing antibacterial particles using the organic template to form initial core-shell particles in which the organic template is coated by the antibacterial particles; forming a shell on the surface of the initial core-shell particles, wherein the shell has a porous structure; and The organic template is removed to form functional particles with a core-shell structure, wherein the core-shell structure includes a core body and the shell coated on the surface of the core body, the core body includes the antibacterial particles, and the core body has a hollow structure.

10. A device, characterized in that: include: substrate; as well as The functional coating according to any one of claims 1 to 8, wherein the functional coating is disposed on at least one side of the substrate.

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