Preparation method of self-cleaning antibacterial coating and optical window glass

Abstract

The application provides a preparation method of self-cleaning antibacterial coating and optical window glass. The preparation method of the self-cleaning antibacterial coating comprises the following steps: preparing nickel-iron alloy nanoparticles; adding the nickel-iron alloy nanoparticles into a silver-ammonia solution to prepare a core-shell structure in which the nickel-iron alloy nanoparticles are coated with silver; modifying the core-shell structure by using a dendrimer; and adding the modified nickel-iron-silver nano core-shell structure into a methoxysilane solution to obtain the self-cleaning antibacterial coating. The self-cleaning antibacterial coating prepared by the preparation method of the self-cleaning antibacterial coating can release static electricity on the surface of the window, thereby achieving dust prevention, and can realize antibiosis through Ag ions.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of camera imaging technology, in particular to a preparation method of self-cleaning antibacterial coating and optical window glass. BACKGROUND

[0002] As an important component of protection and lighting of camera lens, the transparent optical window has a key influence on the clarity, brightness, color saturation and other aspects of optical imaging, and has important research significance.

[0003] However, the current optical window glass is easy to stick dust and other dirt, and easy to leave fingerprints, so not only the appearance of the product is not beautiful, but also the use performance of the product is directly affected, which brings inconvenience to the user. SUMMARY

[0004] To solve the above technical problems, the present application provides a preparation method of self-cleaning antibacterial coating and optical window glass.

[0005] To solve the above technical problems, the present application provides a preparation method of self-cleaning antibacterial coating, which comprises:

[0006] Preparation of nickel-iron alloy nanoparticles;

[0007] The nickel-iron alloy nanoparticles are added to the silver-ammonia solution to prepare a core-shell structure of silver-coated nickel-iron alloy nanoparticles;

[0008] The core-shell structure is modified by dendrimers;

[0009] The modified nickel-iron silver nano core-shell structure is added to the methoxysilane solution to prepare the self-cleaning antibacterial coating.

[0010] The core-shell structure is modified by dendrimers, which comprises:

[0011] The core-shell structure is modified by alkoxysilane and organic solvent.

[0012] The core-shell structure is modified by dendrimers, which comprises:

[0013] The core-shell structure is modified by alkoxysilane and organic solvent.

[0014] The core-shell structure is modified by alkoxysilane and organic solvent, which comprises:

[0015] The core-shell structure is modified by a plurality of alkoxysilanes and organic solvents, and / or the core-shell structure is modified by alkoxysilane and organic solvent for multiple times.

[0016] The modification of the core-shell structure by using alkoxy silane and organic solvent comprises:

[0017] The core-shell structure is dissolved in anhydrous ethanol solution, and N-methyl-3-aminopropyl trimethoxysilane is added to prepare a primary modified core-shell structure by drying;

[0018] The primary modified core-shell structure is dissolved in a methanol solution, and acrylic acid acetate and ethylenediamine are added to prepare a dendrimer modified core-shell structure.

[0019] Before the nickel-iron alloy nanoparticles are added to the silver-ammonia solution, the preparation method further comprises:

[0020] The nickel-iron alloy nanoparticles are added to anhydrous ethanol to obtain a nickel-iron alloy dispersion liquid;

[0021] 3-methacryloxypropyl methyl dimethoxysilane is added to the nickel-iron alloy dispersion liquid, and reflux treatment is performed.

[0022] The preparation of the nickel-iron alloy nanoparticles comprises:

[0023] Ferrous sulfate, nickel chloride, polyethylene glycol, and cyclohexane are added to deionized water to obtain a pre-dispersion solution;

[0024] A mixed solution of hydrazine hydrate and sodium hydroxide is added to the pre-dispersion solution, and the nickel-iron alloy nanoparticles are prepared by drying.

[0025] To solve the above technical problems, the application also provides an optical window glass comprising the self-cleaning antibacterial coating prepared by the preparation method.

[0026] The optical window glass further comprises a micro-nano coil on the self-cleaning antibacterial coating of the optical window glass, and the micro-nano coil is used to form an alternating magnetic field on the surface of the optical window glass, so that the core-shell structure on the self-cleaning antibacterial coating swings back and forth under the action of the alternating magnetic field.

[0027] The micro-nano coil comprises alternating silver paste layers and insulating layers, wherein the insulating layers are coated with conductive silver paste in a predetermined space; the first layer of silver paste layer is provided with a bottom pad, and the last layer of insulating layer is provided with an upper pad, and the bottom pad and the upper pad are welded with a wire.

[0028] Compared with the prior art, the application has the beneficial effects that: the application prepares the nickel-iron alloy nanoparticles; the nickel-iron alloy nanoparticles are added into the silver-ammonia solution to prepare the core-shell structure of the silver-coated nickel-iron alloy nanoparticles; the core-shell structure is modified by the dendrimer; the modified nickel-iron silver nano core-shell structure is added into the methoxysilane solution to prepare the self-cleaning antibacterial coating. The self-cleaning antibacterial coating prepared by the preparation method of the self-cleaning antibacterial coating can release the static electricity on the surface of the window, realize dust prevention, and realize antibiosis through the Ag ions. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the application, the drawings needed to be used in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0030] Wherein:

[0031] Figure 1 is a flowchart of an embodiment of the preparation method of the self-cleaning antibacterial coating provided by the application;

[0032] Figure 2 is a schematic diagram of a multi-generation dendrimer structure provided by the application;

[0033] Figure 3 is a schematic diagram of the FeNi@Ag magnetic core-shell modified by the dendrimer provided by the application;

[0034] Figure 4 is a schematic diagram of an embodiment of the self-cleaning optical window glass provided by the application;

[0035] Figure 5 is a schematic diagram of a section of an embodiment of the self-cleaning optical window glass provided by the application;

[0036] Figure 6 is a schematic diagram of the silver paste printing provided by the application;

[0037] Figure 7 is a schematic diagram of the positive and negative current conversion magnetic field distribution of the up and down wire energization. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the application will be described clearly and completely in the following with reference to the drawings of the embodiments of the application. Obviously, the described embodiments are only some of the embodiments of the application, not all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the application.

[0039] The terms "first", "second", "third", "fourth" etc. (if any) in the description and claims of this application and the above drawings are used for distinguishing between similar objects, not necessarily for describing a specific sequential or chronological order. It is to be understood that the use of such terms is merely for distinguishing between the objects and not necessarily for describing a specific sequential or chronological order, unless explicitly stated otherwise. Furthermore, the terms "comprising" and "including", together with their conjugates, as used herein, have the meaning in the context of this disclosure, which is open-ended and means that other steps or elements which are not specifically mentioned can be included or are optional. It will be understood by those within the art that the application is not limited in scope to the embodiments disclosed herein, which are intended as examples only so as to enable others skilled in the art to

[0040] The application provides a self-cleaning antibacterial coating and an active dustproof self-cleaning antibacterial window, a magnetic core-shell structure is constructed through a surface coating layer, a micro-nano coil is constructed around the periphery, a magnetic field is established by electrifying the coil, and the magnetic core-shell structure swings back and forth by reversing the positive and negative electrodes of the coil, thereby realizing dustproof self-cleaning.

[0041] Specifically refer to Figure 1 , Figure 1 is a flowchart of an embodiment of a preparation method of the self-cleaning antibacterial coating provided by the application.

[0042] As Figure 1 shown, the specific steps are as follows:

[0043] Step S11: preparing nickel-iron alloy nanoparticles.

[0044] In the embodiment of the application, a certain amount of ferrous sulfate and nickel chloride are taken, the molar mass is 1:1, a proper amount of polyethylene glycol (PEG) and cyclohexane are added, and then a mixed solution of hydrazine hydrate and NaOH is added after pre-dispersing in 100 mL of deionized water.

[0045] The reaction is carried out at 85℃ and 400r / min for 90min. After the reaction is completed, the reaction solution is cooled to room temperature, centrifuged, washed with water, washed with anhydrous ethanol, and finally vacuum dried at room temperature to obtain FeNi alloy nanoparticles, i.e. nickel-iron alloy nanoparticles. The FeNi particles prepared by the above process have a particle size of about 100nm, and the surface presents a papillary structure.

[0046] Before preparing the FeNi@Ag nano core-shell structure by using the FeNi alloy nanoparticles, the FeNi alloy nanoparticles need to be subjected to a reflux treatment.

[0047] Specifically, 0.5 g of FeNi alloy nanoparticles is added to 125 ml of anhydrous ethanol and ultrasonically dispersed for 30 min. The dispersion is added to 3-methacryloxypropylmethyldimethoxysilane (MPTS) at 85°C and refluxed for 9 h, then cooled to room temperature and washed with ethanol and water.

[0048] wherein 3-methacryloxypropylmethyldimethoxysilane (MPTS) is an organosilicon compound commonly used in surface modification, coating preparation and material functional modification fields. It has many special chemical properties and application values:

[0049] MPTS is an organosilicon monomer with high reactivity. Its chemical structure contains acryloxy and methyl dimethoxysilane groups, which can undergo many important chemical reactions in the reaction. The presence of acryloxy group makes MPTS have high grafting and crosslinking properties, which can be used to prepare polymer materials, coatings and adhesives, etc.

[0050] At the same time, the introduction of methyl dimethoxysilane group endows MPTS with the ability to modify the surface of inorganic materials, which can be used to change the hydrophilicity, adhesion and mechanical properties of materials, etc. MPTS has good hydrophilicity. Due to the presence of methyl dimethoxysilane group, MPTS can effectively bond with the surface of inorganic materials to form a strong hydrophilic silicon-oxygen bond. This makes MPTS have wide application prospects in material surface modification. For example, modifying MPTS on the surface of inorganic materials can change the surface properties of the materials, such as improving the wettability, adhesion and corrosion resistance of the materials, etc.

[0051] Therefore, in the embodiments of the present application, MPTS is used to adsorb Ag ions onto the surface of FeNi alloy nanoparticles under high temperature conditions to modify the surface, i.e. to coat FeNi alloy nanoparticles with Ag as a shell.

[0052] Step S12: adding nickel-iron alloy nanoparticles to silver ammonia solution to prepare a core-shell structure of nickel-iron alloy nanoparticles coated with silver.

[0053] In the embodiments of the present application, the refluxed nickel-iron alloy nanoparticles are added to 125 ml of anhydrous ethanol and ultrasonically dispersed for 45 min, then 125 ml of silver ammonia solution is added, stirred for 1 h, and then 12.5 ml of formaldehyde solution is added. Stirring is carried out at 45°C for 45 min, then the mixture is cooled to room temperature, washed with a magnetic separator for three to five times, and vacuum dried at room temperature for 8 h to obtain FeNi@Ag nano core-shell structure. The FeNi@Ag nano core-shell structure is a core-shell structure of FeNi nanoparticles coated with Ag.

[0054] Step S13: modifying the core-shell structure with dendrimers.

[0055] In the embodiment of the present application, the dendrimer modified FeNi@Ag magnetic nanocore-shell structure is constructed.

[0056] Firstly, the dendrimer involved in the present application includes but is not limited to the following types of alkoxysilane: methoxysilane, ethoxysilane, propoxysilane, butoxysilane, etc. Specifically as Figure 2 Figure 2 is a schematic diagram of the multi-generation dendrimer structure provided by the present application.

[0057] Then, the FeNi@Ag nanocore-shell structure prepared in step S12 is modified by any one or more of the above alkoxysilanes and organic solvents. During the modification, a single modification or multiple modifications can be performed on the FeNi@Ag nanocore-shell structure using various types of alkoxysilanes and organic solvents, or a single modification or multiple modifications can be performed on the FeNi@Ag nanocore-shell structure using one type of alkoxysilane and organic solvent.

[0058] In a specific embodiment, the FeNi@Ag magnetic core-shell particles are dissolved in anhydrous ethanol solution, mixed by ultrasonic wave for 60 min, then N-methyl-3-aminopropyl trimethoxysilane is added, and the mixture is repeatedly stirred at 65°C for 8 h to generate a product. The product is repeatedly washed with anhydrous ethanol, and finally obtained by magnetic separation. Then, the product is dried into a powder under vacuum at room temperature.

[0059] The FeNi@Ag magnetic core-shell particles modified by N-methyl-3-aminopropyl trimethoxysilane are dissolved in methanol, then acrylic acid ester is added dropwise, and the mixture is stirred at room temperature for 8 h. Then, ethylenediamine is added, and the mixture is stirred at 60°C for 10 h. Then, the solvent and monomer are removed by distillation to obtain the macromolecule modified FeNi@Ag magnetic core-shell particles. After multiple modifications, a multi-layer FeNi@Ag magnetic core-shell particle can be obtained, and the overall structure is as shown in Figure 3 Figure 3 is a schematic diagram of the dendrimer modified FeNi@Ag magnetic core-shell provided by the present application.

[0060] Step S14: The modified nickel-iron-silver nanocore-shell structure is added into a methoxysilane solution to prepare a self-cleaning antibacterial coating.

[0061] In the embodiment of the present application, the FeNi@Ag magnetic core-shell particles modified by the dendrimer in step S13 are added into a methoxysilane solution, and the mixture is repeatedly stirred to prepare a magnetic self-cleaning antibacterial coating.

[0062] ​​In the embodiment of the present application, the nickel-iron alloy nanoparticles are prepared; the nickel-iron alloy nanoparticles are added into the silver-ammonia solution to prepare the core-shell structure of the nickel-iron alloy nanoparticles coated with silver; the core-shell structure is modified by the dendrimer; the modified nickel-iron-silver core-shell structure is added into the methoxysilane solution to prepare the self-cleaning antibacterial coating. The self-cleaning antibacterial coating prepared by the preparation method of the self-cleaning antibacterial coating can release the static electricity on the surface of the window to achieve dust prevention and can achieve antibacterial effect through the Ag ions.

[0063] Those skilled in the art can understand that, in the above method of the specific embodiment, the writing order of each step does not mean a strict execution order and does not constitute any limitation on the implementation process, and the specific execution order of each step should be determined according to its function and possible internal logic.

[0064] Based on the preparation method of the magnetic self-cleaning antibacterial coating prepared in the present application, Figure 1 the magnetic self-cleaning antibacterial coating is coated on the window glass to obtain the self-cleaning optical window glass. Specifically, the magnetic self-cleaning antibacterial coating prepared in the present application is coated on the window glass by the roll coater. Figure 1 The obtained magnetic self-cleaning antibacterial coating mixed sol is uniformly coated on the window glass by controlling the key parameters such as the roll coating speed, the roll coating pressure, and the surface roughness of the roll to control the thickness and uniformity of the roll coating film. Then, the window glass is placed in an oven for drying, and the oven needs to be clean and tidy during baking, and the dust level needs to reach the level of 100,000.

[0065] Further, the self-cleaning optical window glass also needs a micro-nano coil to form an alternating magnetic field on the surface of the optical window glass to make the core-shell structure on the self-cleaning antibacterial coating swing back and forth under the action of the alternating magnetic field, so that the water droplets cannot adhere to the surface of the coating, realizing the super-hydrophobicity of the optical window surface. At the same time, during the swinging process, for example, the effect of a broom, dust and ash can be removed, realizing self-cleaning.

[0066] Specifically, please refer to Figure 4 and Figure 5 , Figure 4 is the overall schematic diagram of one embodiment of the self-cleaning optical window glass provided in the present application, Figure 5 is the cross-sectional schematic diagram of one embodiment of the self-cleaning optical window glass provided in the present application. In the above, Figure 4 the substrate in the above is the substrate of the window glass, and the coating layer is the protective layer formed by coating the magnetic self-cleaning antibacterial coating on the substrate. The micro-nano coil is arranged outside the coating layer, and the installation process is as follows:

[0067] First, a layer of silver paste line is coated outside the coating layer to form a silver paste layer, and the thickness of the silver paste layer is 1-10 um. Then, a bottom pad is left at the corner. Please refer to Figure 6, continue to coat the insulating oil on the silver paste layer to form an insulating layer, and the thickness of the insulating layer is 1um-10um. Among them, the bottom pad position is not coated with insulating oil, and the upper right corner of the substrate is also not coated with insulating oil, leaving space to coat conductive silver paste, and the conductive silver paste in this layer and the insulating layer are consistent in thickness. Then, continue to coat the silver paste layer on the first layer of insulating layer, and the thickness is 1um-10um, wherein the second layer of silver paste layer is conducted through the conductive silver paste left by the first layer of insulating layer.

[0068] Repeat the above process to print multiple layers of silver paste and insulating layers by layer-by-layer stacking. In one specific embodiment, the number of silver paste and insulating layers is not less than 10 layers. Finally, as shown in Figure 5 , the wires are welded on the upper and bottom pads.

[0069] The present application disperses the dendrimer-modified FeNi@Ag magnetic core-shell particle structure into a methoxysilane solution as a coating, coats the window surface, and then outside the coating layer, a circular coil is prepared by layer-by-layer stacking. Then conduct electricity through the coil, wherein the coil is powered by reversing positive and negative voltages, and then the N-S level of the window surface is reversed, as shown in Figure 7 , the magnetic ions will swing back and forth during the magnetic field reversal process, for example, the papillary structure on the lotus leaf, as shown in Figure 3 .

[0070] The diameter of the FeNi@Ag magnetic core-shell particle is about 100-200nm, and since the general water droplet is more than 10um, the water droplet cannot adhere to the surface of the coating layer due to the swinging of the FeNi@Ag magnetic core-shell particle on the dendrimer structure, thereby realizing super-hydrophobicity on the window surface. At the same time, during the swinging process, for example, the effect of a broom, dust and ash can be removed, realizing self-cleaning. At the same time, due to the use of FeNi@Ag core-shell particles, due to their conductivity, the surface of the coating layer can release static electricity, thereby reducing dust adhesion and achieving dust prevention; due to the presence of Ag on the surface, the coating layer has antibacterial effect.

[0071] The present application proposes an active hydrophobic and dust-proof method, which is different from the existing coating structure, which can only passively realize super-hydrophobicity and passive dust removal; the current can be changed to realize active hydrophobicity and dust removal.

[0072] The present application proposes to construct a micro-nano coil to form an alternating magnetic field on the window surface.

[0073] The present application proposes a hydrophobic and dust-proof method and structure: cross-link the magnetic core-shell structure through the dendrimer structure to make the magnetic core-shell structure swing back and forth under the action of the above alternating magnetic field, realizing active self-cleaning and dust prevention.

[0074] The application provides FeNi@Ag core-shell particles: through the material characteristics, the static electricity on the window surface can be released, dust prevention is realized; through Ag ions, antibiosis is realized.

[0075] The above only describes the embodiments of the application, and does not limit the patent scope of the application, and any equivalent structure or equivalent process transformation using the content of the application specification and drawings, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the application.

Claims

1. A method for preparing a self-cleaning antibacterial coating, characterized in that, The preparation method includes: Preparation of nickel-iron alloy nanoparticles; The nickel-iron alloy nanoparticles were added to a silver ammonia solution to prepare a core-shell structure with silver coating on the nickel-iron alloy nanoparticles. The core-shell structure was modified using dendritic macromolecules; The modified nickel-iron-silver nano-core-shell structure was added to a methoxysilane solution to prepare the self-cleaning antibacterial coating. Before adding the nickel-iron alloy nanoparticles to the silver ammonia solution, the preparation method further includes: The nickel-iron alloy nanoparticles were added to anhydrous ethanol to obtain a nickel-iron alloy dispersion. 3-Methacryloxypropylmethyldimethoxysilane was added to the nickel-iron alloy dispersion and refluxed.

2. The preparation method according to claim 1, characterized in that, The modification of the core-shell structure using dendritic macromolecules includes: The core-shell structure was modified using alkoxysilanes and organic solvents.

3. The preparation method according to claim 2, characterized in that, The alkoxysilane is one or more of methoxysilane, ethoxysilane, propoxysilane, and butoxysilane.

4. The preparation method according to claim 2 or 3, characterized in that, The modification of the core-shell structure using alkoxysilanes and organic solvents includes: The core-shell structure is modified using a variety of alkoxysilanes and organic solvents, and / or the core-shell structure is modified multiple times using alkoxysilanes and organic solvents.

5. The preparation method according to claim 4, characterized in that, The modification of the core-shell structure using alkoxysilanes and organic solvents includes: The core-shell structure was dissolved in anhydrous ethanol solution, and N-methyl-3-aminopropyltrimethoxysilane was added and dried to obtain the first modified core-shell structure. The initially modified core-shell structure was dissolved in a methanol solution, and acrylate and ethylenediamine were added to obtain a dendritic macromolecule-modified core-shell structure.

6. The preparation method according to claim 1, characterized in that, The preparation of nickel-iron alloy nanoparticles includes: Ferrous sulfate, nickel chloride, polyethylene glycol, and cyclohexane were added to deionized water to obtain a pre-dispersed solution. Nickel-iron alloy nanoparticles were obtained by adding a mixture of hydrazine hydrate and sodium hydroxide to the pre-dispersed solution and then drying it.

7. An optical window glass, characterized in that, The optical window glass comprises a self-cleaning antibacterial coating prepared by the preparation method according to any one of claims 1 to 6.

8. The optical window glass according to claim 7, characterized in that, The self-cleaning antibacterial coating of the optical window glass is also provided with micro-nano coils. The micro-nano coils are used to form an alternating magnetic field on the surface of the optical window glass, so that the core-shell structure on the self-cleaning antibacterial coating swings back and forth under the action of the alternating magnetic field.

9. The optical window glass according to claim 8, characterized in that, The micro / nano coil includes alternating layers of silver paste and insulating layers, wherein conductive silver paste is coated in a predetermined space of the insulating layer; the first layer of silver paste has a bottom pad, and the last layer of insulating layer has an upper pad, wherein wires are welded to the bottom pad and the upper pad.

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