A method for preparing a composite antibacterial and detoxifying coating on a ceramic surface

Abstract

This invention belongs to the field of antibacterial coating technology, specifically relating to a method for preparing a composite antibacterial and detoxifying coating on a ceramic surface, comprising the following steps: S1. Applying gold solution to a fired ceramic surface and then annealing to prepare a transition layer; S2. Preparing a silver-plated antibacterial layer on the ceramic surface with the transition layer formed by vacuum evaporation; S3. Preparing a titanium-plated protective layer on the surface with the silver-plated antibacterial layer formed by vacuum evaporation; S4. Vacuum annealing the ceramic with the titanium-plated protective layer formed to obtain the finished product. The composite antibacterial and detoxifying coating on a ceramic surface prepared by this invention has excellent antibacterial properties, with an antibacterial rate of up to 99.99%, meeting the antibacterial performance requirements of ceramics. Furthermore, the composite antibacterial and detoxifying coating on a ceramic surface prepared by this invention can effectively reduce cyanide in solutions such as liquor, meeting the detoxification performance requirements of ceramics. In addition, the composite antibacterial and detoxifying coating on a ceramic surface prepared by this invention has a precious metal ceramic decorative effect, making the ceramic surface smoother and more glossy, thus improving the quality of the ceramic.

Description

Technical Field

[0001] This invention belongs to the field of antibacterial coating technology, specifically relating to a method for preparing a composite antibacterial and detoxifying coating on a ceramic surface. Background Technology

[0002] With the improvement of living standards and the increasing awareness of health, antibacterial materials have emerged. The demand for ceramic products with antibacterial functions is also growing. Most antibacterial ceramic products use a technique of adding antibacterial agents to the glaze. However, because most antibacterial agents are not concentrated on the surface of the ceramic product, the antibacterial effect is relatively poor. To improve the antibacterial effect, another technique is to coat the surface of the ceramic product with an antibacterial layer. This method usually uses nano-silver particles as the antibacterial active substance. However, during the coating process, the nano-silver particles are limited by the coating process, resulting in low adhesion to the substrate and easy detachment, thus affecting the antibacterial performance. Furthermore, antibacterial coatings also suffer from problems such as easy oxidation and deactivation of antibacterial agents, excessive silver leaching which can harm the human body, and short antibacterial duration. Therefore, how to prepare a ceramic antibacterial coating with excellent antibacterial activity, long service life, and effective control of silver leaching is of great significance to the development of ceramic antibacterial materials.

[0003] The inventors discovered that existing antibacterial methods for ceramic surfaces have problems such as low antibacterial activity, short lifespan, inability to meet practical use requirements, lack of decorative effect, and inability to be widely promoted.

[0004] The information disclosed in this background section is intended only to enhance the understanding of the overall background of the invention and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to provide a method for preparing a composite antibacterial and detoxifying coating on a ceramic surface.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A method for preparing a composite antibacterial and detoxifying coating on a ceramic surface includes the following steps:

[0008] S1. A transition layer is prepared by coating the fired ceramic surface with gold solution and then annealing.

[0009] S2. A silver-plated antibacterial layer is prepared on the ceramic surface where a transition layer has been formed by vacuum evaporation.

[0010] S3. A titanium-plated protective layer is prepared on the surface of the already formed silver-plated antibacterial layer by vacuum evaporation.

[0011] S4. Vacuum annealing is performed on the ceramic with the titanium-plated protective layer to obtain the finished product.

[0012] Preferably, in step S1, the annealing temperature is 500-900℃ and the annealing time is 40-100min.

[0013] Preferably, in step S2, metallic silver is used as the target material, and the electron beam evaporation coating machine chamber is evacuated to 2×10⁻⁶ at room temperature. -4 Pa-2×10 -5 Pa, sample stage rotation speed 1-20 r / min, gold deposition rate 0.1-10 A / s, depositing nano-silver with a thickness of 50-3000 nm on the surface of ordinary gold-plated ceramic layer.

[0014] Preferably, in step S3, titanium metal is used as the target material, and the electron beam evaporation coating machine chamber is evacuated to 2×10⁻⁶ at room temperature. -4 Pa-2×10 -5 Pa, sample stage rotation speed 1-20 r / min, gold deposition rate 0.1-10 A / s, depositing nano-titanium with a thickness of 10-300 nm on the surface of ordinary gold-plated ceramic layer.

[0015] Preferably, in step S4, the annealing temperature is 250-400℃ and the annealing time is 0.5-3h.

[0016] Preferably, the composite antibacterial and detoxifying coating on the ceramic surface is used for detoxification, antibacterial purposes, and reducing cyanide in the solution.

[0017] The present invention also provides a composite antibacterial and detoxifying coating for ceramic surfaces, which is prepared by the method for preparing the composite antibacterial and detoxifying coating for ceramic surfaces.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] (1) The composite antibacterial and detoxifying coating on the ceramic surface prepared by this invention includes a transition layer, a silver-plated antibacterial layer, and a titanium-plated protective layer. The transition layer connects the substrate and the silver-plated antibacterial layer, reduces the difference in the coefficient of expansion between the ceramic material and the metal material, enhances the bonding force between the metal-ceramic layer and the substrate, and reduces coating cracking and peeling. The titanium-plated protective layer can prevent the oxidation of the nano-silver of the silver-plated antibacterial layer, and can also effectively control silver dissolution, preventing excessive silver ions from harming the human body. In addition, titanium dioxide will be formed on the surface of the titanium-plated protective layer due to oxidation. Titanium dioxide can improve wear resistance and also has certain antibacterial and photocatalytic properties, which help the antibacterial layer to further improve its antibacterial performance.

[0020] (2) The composite antibacterial and detoxifying coating on the ceramic surface prepared by the present invention has good antibacterial properties and an antibacterial rate of up to 99.99%, which meets the antibacterial performance requirements of ceramics.

[0021] (3) The composite antibacterial and detoxifying coating on the ceramic surface prepared by the present invention can also effectively reduce cyanide in solutions such as liquor, thus meeting the detoxification performance requirements of ceramics.

[0022] (4) The ceramic surface composite antibacterial and detoxifying coating prepared by the present invention has the decorative effect of precious metal ceramics, making the ceramic surface smoother and more lustrous, thus improving the quality of ceramics. Attached Figure Description

[0023] Figure 1 This is a flowchart illustrating the preparation process of the composite antibacterial and detoxifying coating on the surface of the ceramic cup in Example 1.

[0024] Figure 2 The results of the antibacterial experiment for the composite antibacterial and detoxifying coating on the surface of the ceramic cup in Example 2 are as follows;

[0025] Figure 3 This is a colorimetric comparison of the adsorption of cyanide by the composite antibacterial and detoxifying coating on the surface of the ceramic cup in Example 3. Detailed Implementation

[0026] The technical solution of this invention patent will be clearly and completely described below. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this invention.

[0027] Example 1 Preparation of composite antibacterial and detoxifying coating on ceramic cup surface

[0028] A method for preparing a composite antibacterial and detoxifying coating on a ceramic surface includes the following steps:

[0029] S1. Clean the daily ceramic cup with alcohol, dry it, apply gold solution evenly to the inner wall of the ceramic cup, let it stand for 12 hours, and then anneal it in an annealing furnace at 800℃ for 1 hour.

[0030] S2. Clean and dry the annealed ceramic cup with alcohol, then place the ceramic cup into an electron beam evaporation coating machine. Evaporate the chamber of the electron beam evaporation coating machine to a vacuum level of 2×10⁻⁶. -5 Pa, sample stage rotation speed 5r / min, high-purity metallic silver as target material, silver deposition rate 10A / s, depositing a silver layer with a thickness of 1000nm on the ceramic surface;

[0031] S3. Place the silver ceramic cup into the titanium electron beam evaporation coating machine, and evacuate the chamber of the electron beam evaporation coating machine to a vacuum level of 2×10⁻⁶. -5 Pa, sample stage rotation speed 5 r / min, high-purity metallic titanium as target material, titanium deposition rate 5 A / s, and titanium layer with a deposition thickness of 50 nm;

[0032] S4. Place the ceramic cup in a vacuum annealing furnace, evacuate to 10 Pa, anneal for 1 hour, and anneal at 300℃.

[0033] A transition layer is prepared using a gold-water process, and a silver-plated antibacterial layer and a titanium-plated protective layer are prepared using electron beam evaporation. The transition layer connects the ceramic substrate and the silver-plated antibacterial layer, enhancing the bonding force between the ceramic substrate and the silver-plated antibacterial layer. The titanium-plated protective layer can improve wear resistance and prevent oxidation of the silver-plated antibacterial layer. The vacuum annealing process helps to improve the bonding force between the composite antibacterial and detoxifying coating and the ceramic. The prepared composite antibacterial and detoxifying coating consists of nano-sized silver-titanium particles.

[0034] Example 2 Antibacterial test of composite antibacterial and detoxifying coating on ceramic cup surface

[0035] The antibacterial and detoxifying coating on the surface of the ceramic cup in Example 1 was tested for antibacterial performance using the JIS-Z-2801:2010 standard, "Antibacterial processed products - Test methods for antibacterial properties, antibacterial effect". An uncoated ceramic cup was used as a comparison. The results are as follows: Figure 2 As shown.

[0036] Depend on Figure 2 It is known that the antibacterial and detoxifying coating on the surface of ceramic cups can achieve an antibacterial rate of 99.99%, which significantly improves antibacterial activity compared to uncoated ceramic cups and avoids bacterial contamination during use.

[0037] Example 3 Experiment on the detoxification effect of composite antibacterial and detoxifying coating on ceramic cup surface

[0038] The ability of the gold-plated ceramic cup prepared in Example 1 to adsorb cyanide was determined using a colorimetric cyanide assay kit. The specific steps are as follows:

[0039] S1. Add cyanide to 200 mL of sorghum liquor to prepare a solution with a concentration of 10 ng / L;

[0040] S2. Pour the prepared sorghum liquor into a ceramic cup with nano-gold coating and let it soak for 20 minutes;

[0041] S3. The change in cyanide concentration before and after adsorption was detected using a colorimetric cyanide assay kit. The results are as follows: Figure 3 As shown.

[0042] The colorimetric cyanide determination kit was used to determine the cyanide content in sorghum liquor; the lighter the color, the lower the cyanide concentration. Figure 3 The color of the cyanide assay reagent clearly decreased after adsorption. Therefore, the ceramic cup with nano-gold coating has a good detoxification effect and can effectively reduce cyanide in solutions such as liquor.

[0043] The foregoing description of specific exemplary embodiments of the invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the invention to the precise forms disclosed, and it will be apparent that many changes and variations can be made in accordance with the foregoing teachings. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application, thereby enabling those skilled in the art to implement and utilize various different exemplary embodiments of the invention, as well as various different choices and variations. The scope of the invention is intended to be defined by the claims and their equivalents.

Claims

1. A method for preparing a composite antibacterial and detoxifying coating on a ceramic surface, characterized in that, Includes the following steps: S1. A transition layer is prepared by coating the fired ceramic surface with gold solution and then annealing. S2. A nano-silver antibacterial layer with a thickness of 50-3000 nm is prepared on the ceramic surface where a transition layer has been formed by vacuum evaporation. S3. Prepare a nano-titanium protective layer with a thickness of 10-300nm on the surface of the formed silver-plated antibacterial layer by vacuum evaporation; S4. Vacuum annealing is performed on the ceramic with the titanium-plated protective layer to obtain the finished product; wherein, In step S1, the annealing temperature is 500-900℃ and the annealing time is 40-100min; In step S4, the annealing temperature is 250-400℃ and the annealing time is 0.5-3h.

2. The method for preparing a composite antibacterial and detoxifying coating on a ceramic surface according to claim 1, characterized in that, In step S2, metallic silver is used as the target material, and the chamber of the electron beam evaporation coating machine is evacuated to 2×10⁻⁶ at room temperature. -4 Pa-2×10 -5 Pa, sample stage rotation speed 1-20 r / min, gold deposition rate 0.1-10 A / s, depositing nano-silver with a thickness of 50-3000 nm on the transition layer surface.

3. The method for preparing a composite antibacterial and detoxifying coating on a ceramic surface according to claim 1, characterized in that, In step S3, titanium metal is used as the target material, and the chamber of the electron beam evaporation coating machine is evacuated to 2×10⁻⁶ at room temperature. -4 Pa-2×10 -5 Pa, sample stage rotation speed 1-20 r / min, gold deposition rate 0.1-10 A / s, depositing nano-titanium with a thickness of 10-300 nm on the surface of silver-plated antibacterial layer.

4. The method for preparing a composite antibacterial and detoxifying coating on a ceramic surface according to claim 1, characterized in that, The composite antibacterial and detoxifying coating on the ceramic surface is used for detoxification and antibacterial purposes.

5. A composite antibacterial and detoxifying coating for ceramic surfaces, characterized in that, It is prepared by the method for preparing a composite antibacterial and detoxifying coating on a ceramic surface as described in any one of claims 1-4.

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