Antibacterial glass and preparation method thereof

Abstract

The present invention relates to the technical field of antibacterial glass, and in particular to an antibacterial glass and a preparation method thereof. The antibacterial glass of the present invention prepares an antibacterial active layer on a glass substrate by a one-time exchange method, which can greatly improve the antibacterial activity and wear resistance of the glass substrate. At the same time, the preparation process can be significantly simplified, which can greatly reduce the processing cost of the antibacterial glass and is conducive to its industrial application.

Description

Technical Field

[0001] The present invention relates to the technical field of antibacterial glass, and in particular to an antibacterial glass and a preparation method thereof. Background Art

[0002] Antibacterial glass is a functional glass with antibacterial and sterilization functions. Antibacterial glass not only has the characteristics of transparency, hardness, thermal stability and other characteristics of traditional glass, but also has the characteristics of antibacterial, easy to clean and wear-resistant. Antibacterial glass can effectively prevent pathogenic microorganisms from growing and multiplying on the surface, thereby playing a role in protecting human health. It is widely used in daily life. For example, in the medical industry, antibacterial glass can be used in operating rooms, isolation wards, drug warehouses, laboratories and other places to effectively control the reproduction of bacteria and protect the health of medical staff and patients. In addition, antibacterial glass can also be used in medical equipment, medical glassware and other aspects to improve the hygienic safety of medical equipment. In the food industry, antibacterial glass can be used in refrigerators, food cabinets, display cabinets, water dispensers and other equipment to prevent food from being contaminated by bacteria through antibacterial and sterilization functions to ensure food safety.

[0003] At present, antibacterial glass in the glass industry is divided into slow-release and photocatalytic antibacterial glass materials according to different antibacterial mechanisms. Among them, slow-release antibacterial glass is a material combined with ionized metals with antibacterial and mildew-proof properties, such as silver, copper, zinc, etc. Through the overall dissolution of the glass, the silver, zinc and other ions in the glass network are released, thereby achieving the antibacterial purpose. Photocatalytic antibacterial glass is formed by a new type of photocatalyst through metal ion doping modification technology, multi-element co-doping and precious metal ion deposition technology, forming a nano-inorganic antibacterial layer, and generating active oxygen species under light conditions that can penetrate the cell wall of fungi. At present, there are three main methods for manufacturing the above two antibacterial glass materials, including: inorganic coating, ion exchange and one-time melting, among which one-time melting is more widely used.

[0004] Chinese invention patent with document number CN113816619B discloses an antibacterial strengthened glass and a method for preparing the same, which comprises subjecting the chemically strengthened glass to a first quenching treatment, and then subjecting the glass to an antibacterial ion exchange and a second quenching treatment, wherein: the antibacterial ion exchange process uses a molten salt containing silver ions to obtain an antibacterial strengthened glass having a specific composition on the surface layer. This method can meet the antibacterial effectiveness by implanting low-concentration Ag ions, and does not affect the mechanical and optical properties of the glass. However, the method has the disadvantage that the glass needs to be subjected to a second strengthening treatment, the steps are relatively complicated, and the processing cost is relatively high. Summary of the invention

[0005] In order to solve the above technical problems, the object of the present invention is to provide an antibacterial glass and a preparation method thereof, wherein the antibacterial glass has excellent antibacterial properties, a simple preparation process and low processing cost.

[0006] In order to achieve the above technical effects, the present invention adopts the following technical solutions:

[0007] In a first aspect, the present invention provides an antibacterial glass, comprising:

[0008] Glass substrate;

[0009] An antibacterial active layer is sequentially formed on at least one side of the glass substrate, wherein the thickness of the first antibacterial active layer is 100-300 nm.

[0010] In a second aspect, the present invention further provides a method for preparing the aforementioned antibacterial glass, comprising the steps of:

[0011] S1: preparing a glass substrate;

[0012] S2: placing the prepared glass substrate in an ion exchange solution for antibacterial strengthening treatment to obtain an antibacterial active layer, wherein the ion exchange solution includes at least one or more of silver ions, zinc ions, iron ions, ferrous ions, aluminum ions or cobalt ions, and the temperature of the antibacterial strengthening treatment is 400-450° C.;

[0013] S3: After the antibacterial strengthening treatment is completed, the glass substrate is taken out and subjected to a secondary heat preservation treatment, cooled to room temperature, and cleaned and dried.

[0014] Preferably, the ion exchange solution includes silver ions, aluminum ions and cobalt ions.

[0015] Preferably, the silver ion concentration in the ion exchange solution is 0.01-0.3 wt%, the aluminum ion concentration is 0.01-0.3 wt%, and the cobalt ion concentration is 0.01-0.1 wt%.

[0016] Preferably, the silver ion concentration in the ion exchange solution is 0.2-0.5 wt%, the aluminum ion concentration is 0.1-0.4 wt%, and the cobalt ion concentration is 0.03-0.05 wt%.

[0017] Further preferably, the components in the ion exchange solution and their mass percentages are: 0.2-0.5wt% silver nitrate, 0.1-0.4wt% aluminum nitrate, 0.03-0.05wt% cobalt nitrate, 0.3-0.8wt% potassium carbonate, and the balance is potassium nitrate.

[0018] Preferably, the duration of the antibacterial enhanced treatment is 30 to 120 minutes.

[0019] Preferably, the secondary insulation treatment includes a first stage insulation and a second stage insulation, the first stage insulation temperature is maintained at 450-480°C for 40min-60min; the second stage insulation temperature is maintained at 120-150°C for no less than 120min.

[0020] Preferably, the glass substrate is aluminosilicate glass.

[0021] Furthermore, the glass substrate is aluminosilicate glass having the following components: 8% to 12% Al2O3, 12% to 18% Na2O, 3% to 7% K2O, 2% to 3% MgO, 1.3% to 4% CaO, and the balance is silicon dioxide.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The antibacterial glass provided by the present invention prepares an antibacterial active layer on a glass substrate through a single exchange method. In this process, by improving the composition of the ion exchange liquid, the antibacterial strengthening treatment conditions and the secondary heat preservation treatment conditions after the antibacterial strengthening treatment, the antibacterial activity and wear resistance of the glass substrate can be greatly improved. At the same time, the preparation process is significantly simplified, which can greatly reduce the processing cost of the antibacterial glass and contribute to the industrial application of the antibacterial glass. DETAILED DESCRIPTION

[0024] The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are therefore only used as examples and are not intended to limit the scope of protection of the present invention.

[0025] The specific embodiments listed in the present invention are only examples of the present invention, and the present invention is not limited to the specific embodiments described below. For those skilled in the art, any equivalent modifications and substitutions made to the embodiments described below are also within the scope of the present invention. Therefore, the equalization and modification made without departing from the spirit and scope of the present invention should be included in the scope of the present invention.

[0026] In the examples, if the specific conditions are not specified, the conditions are carried out according to normal conditions or the conditions recommended by the manufacturer. If the manufacturer is not specified for all reagents or instruments, they are all conventional products that can be purchased commercially. In order to better illustrate the present invention, numerous specific details are provided in the specific embodiments below. It should be understood by those skilled in the art that the present invention can be implemented equally without certain specific details. In other embodiments, methods, means, equipment and steps well known to those skilled in the art are not described in detail to highlight the gist of the present invention.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art. Unless otherwise specified, the units used in this specification are all international standard units, and the numerical values ​​and numerical ranges appearing in the present invention should be understood to include the inevitable systematic errors in industrial production.

[0028] Example 1

[0029] This embodiment provides an antibacterial glass and a preparation method thereof. The antibacterial glass includes a glass substrate and an antibacterial active layer formed on both sides of the glass substrate. The preparation method of the antibacterial glass includes the following steps:

[0030] S1: Aluminosilicate glass is prepared as a glass substrate according to a conventional method. The thickness of the glass substrate is 4 mm, and the components of the glass substrate are as follows:

[0031] 11.2% Al2O3, 13.5% Na2O, 4.0% K2O, 2.8% MgO, 1.5% CaO, the balance is silicon dioxide;

[0032] The prepared glass substrate is pickled, and the pickling process is specifically as follows: a pickling solution is prepared by using 10% HF solution and 40% H2SO4 solution in a volume ratio of 3:1 at room temperature, and the prepared glass substrate is placed in the pickling solution for pickling for 5 to 10 minutes;

[0033] S2: placing the pickled glass substrate in an ion exchange solution for antibacterial strengthening treatment to obtain an antibacterial active layer, wherein the composition of the ion exchange solution is:

[0034] 0.2-0.5wt% silver nitrate, 0.1-0.4wt% aluminum nitrate, 0.03-0.05wt% cobalt nitrate, 0.3-0.8wt% potassium carbonate, and the balance potassium nitrate;

[0035] When performing antibacterial enhancement treatment, a sufficient amount of potassium nitrate is weighed and heated to 440°C to form a molten salt, and silver nitrate, aluminum nitrate, cobalt nitrate and potassium carbonate are weighed according to their weight parts, mixed evenly and added to the aforementioned potassium nitrate molten salt to obtain a molten ion exchange liquid, and the molten ion exchange liquid is heated to a preset treatment temperature, which is 400-450°C.

[0036] S3: After the antibacterial strengthening treatment is completed, the glass substrate is taken out and subjected to a secondary heat preservation treatment. The heat preservation temperature of the first stage is 450-480°C, and the duration is 40min-60min; the heat preservation temperature of the second stage is 120-150°C, and the duration is not less than 120min. After the second stage heat preservation treatment is completed, it is cooled to room temperature and cleaned and dried.

[0037] According to the above-mentioned preparation method, this embodiment provides a plurality of preparation examples and comparative examples of antibacterial glass, and the preparation conditions of each group are shown in Table 1:

[0038] Table 1 Preparation process of each group of antibacterial glass

[0039]

[0040] Example 2

[0041] In this embodiment, the antibacterial performance of the antibacterial glass obtained from the above-mentioned groups 1-4 and control groups 1-9 is tested. It should be noted that the antibacterial performance adopted by the present invention is tested by a culture method, and the test bacteria are Escherichia coli and Staphylococcus aureus. At the same time, the antibacterial performance of the obtained antibacterial glass after being rubbed 100,000 times and 200,000 times with steel wool is tested. The test results are shown in Table 2:

[0042] Table 2 Antibacterial performance test of each group of antibacterial glass

[0043]

[0044] The above experimental results show that in the preparation process of antibacterial glass, the composition of the ion exchange liquid, the antibacterial strengthening temperature, time and the conditions of the secondary heat preservation treatment all have an impact on the performance of the antibacterial glass; among them, the antibacterial glass prepared by using the ion exchange liquid compounded with aluminum nitrate and cobalt nitrate and adding potassium carbonate is better than other ion exchange liquids. At the same time, by adding aluminum nitrate and cobalt nitrate to the ion exchange liquid, the prepared antibacterial glass can have good wear resistance and can maintain a good antibacterial effect after friction. In addition, the inventors have further found that the secondary heat preservation treatment after the antibacterial strengthening treatment helps to further improve the antibacterial effect of the antibacterial glass, and the temperature of the secondary heat preservation treatment is preferably not more than 500°C.

[0045] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions of the present invention, which should be included in the scope of the claims of the present invention. The techniques, shapes, and structural parts not described in detail in the present invention are all known technologies.

Claims

1. An antibacterial glass, characterized in that: The antibacterial glass comprises: Glass substrate; An antibacterial active layer is formed on at least one side of the glass substrate, wherein the thickness of the antibacterial active layer is 100 to 300 nm; The method for preparing the antibacterial glass comprises the following steps: S1: preparing a glass substrate; S2: placing the prepared glass substrate into an ion exchange solution for antibacterial strengthening treatment to obtain an antibacterial active layer, wherein the components and their mass percentages in the ion exchange solution are: 0.2-0.5wt% silver nitrate, 0.1-0.4wt% aluminum nitrate, 0.03-0.05wt% cobalt nitrate, 0.3-0.8wt% potassium carbonate, and the balance is potassium nitrate; the temperature of the antibacterial strengthening treatment is 400-450°C; S3: After the antibacterial strengthening treatment is completed, the glass substrate is taken out and subjected to a secondary heat preservation treatment, cooled to room temperature, and cleaned and dried to obtain; The secondary insulation treatment includes a first stage insulation and a second stage insulation. The insulation temperature of the first stage is maintained at 450-480°C for 40-60 minutes. The insulation temperature of the second stage is maintained at 120-150°C for no less than 120 minutes.

2. The antibacterial glass according to claim 1, characterized in that: The duration of the antibacterial enhanced treatment is 30 to 120 minutes.

3. The antibacterial glass according to claim 1, characterized in that: The glass substrate is aluminosilicate glass.

4. The antibacterial glass according to claim 3, characterized in that: The glass substrate is aluminosilicate glass, the components of which are: 8% to 12% Al2O3, 12% to 18% Na2O, 3% to 7% K2O, 2% to 3% MgO, 1.3% to 4% CaO, and the balance is silicon dioxide.

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