Antibacterial and antiviral ceramic ware and preparation method thereof

Abstract

The invention discloses an antibacterial and antiviral low-temperature glaze and a preparation method thereof, an antibacterial and antiviral ceramic ware and a preparation method thereof. When the ceramic ware comes into contact with microorganisms such as bacteria and viruses during use, the ceramic ware can quickly and efficiently kill bacteria and viruses without affecting the strength, wear resistance and appearance of the ceramic ware. No harmful components are generated during use, and no pollution is caused to the environment.

Description

Technical Field

[0001] The invention application type relates to the technical field of daily-use ceramics, and specifically to antibacterial and antiviral low-temperature glazes and preparation methods thereof, and antibacterial and antiviral ceramic vessels and preparation methods thereof. Background Art

[0002] With the improvement of people's quality of life, antibacterial and antiviral materials are being used in various fields such as daily ceramics, and are also loved and paid attention to by more and more people. The emergence of new materials is very important for inhibiting the spread of viruses, which can improve public health and safety and reduce social operating costs to a greater extent. Various bacteria and viruses in the air can easily breed and multiply on ceramic products, causing harm to people's health. Therefore, it is very important to study a functional ceramic that can be antibacterial and antiviral.

[0003] At present, the widely used antibacterial and antiviral materials are mainly chemical reagents, such as disinfectants containing chlorine, alcohol disinfectants, hydrogen peroxide disinfectants, etc. This technology mainly destroys the structure of the virus by chemical methods to inactivate the virus. However, this chemical material is easy to cause damage to people's respiratory tract during use. In recent years, many new materials have been introduced to the surface of objects to achieve antibacterial and antiviral functions. This is also a new way to solve the above problems and can effectively inhibit the risk of virus transmission. The ceramic industry has also put forward higher requirements for antibacterial and antiviral functions, which are specifically manifested in: safety of use, strong antibacterial ability, high temperature resistance, and antibacterial durability. At the same time, it can adapt to the manufacturing process of ceramic utensils and has no effect on the appearance, quality and mechanical properties of the original ceramic products.

[0004] In the existing research on antibacterial materials, nanosilver or nanocopper are widely used, which form coatings that can kill bacteria and viruses, such as patent CN111408733 A (antibacterial and antiviral nanosilver colloidal solution and its preparation method and application), patent CN111441102 A (an antiviral composite polyester fiber and its preparation method), and patent CN111328831A (an antibacterial and antiviral material and application). The surface of these silver or copper-rich coating materials can slowly release silver or copper ions into bacteria or viruses, causing them to lose their biological activity, thereby achieving the inactivation of harmful microorganisms. However, this type of technology inevitably brings the risk of chronic poisoning caused by long-term contact with the human body. CN111393188A also discloses an antibacterial glaze for ceramic sanitary ware, ceramic sanitary ware and a preparation method thereof. The active ingredient of this preparation method is nano-silver, and the ceramic can effectively kill a variety of bacteria in a short time. However, its process is relatively complicated, and the problem of sustained release of silver is not solved. The wear resistance and antibacterial durability are poor, and long-term use will reduce the antibacterial effect of the ceramic.

[0005] Another antibacterial method is to use a photocatalytic antibacterial agent and coat a titanium dioxide or zinc oxide antibacterial film on the ceramic surface using a sol-gel method or an immersion and pulling method. Under the irradiation of light, a photocatalytic reaction similar to photosynthesis will occur, which can oxidize and decompose various organic compounds and some inorganic substances, destroy the cell membrane of bacteria and solidify the protein of viruses, and can also kill bacteria and decompose organic pollutants. However, the titanium dioxide material currently widely used only has ultraviolet light response characteristics and requires ultraviolet light excitation to produce a sterilization effect. For example, the ultraviolet light-responsive anatase titanium dioxide used in the invention patent CN108328694A (ultraviolet light coupled titanium dioxide sterilization and disinfection device and method thereof) is used as a coating material; the public patent CN106470550 A of Showa Denko K.K. (antibacterial and antiviral composition, antibacterial and antiviral agent, photocatalyst, and bacterial and viral inactivation method) uses elements such as copper and silver to improve its visible light activity. In addition, pure titanium dioxide needs to be sintered at a temperature above 800°C to form a stable coating, which causes the crystal form of titanium dioxide to change; if it is sintered below 800°C, there will be serious powder loss, and a large area of ​​complete detachment will occur after ultrasonic treatment.

[0006] In summary, the existing antibacterial and antiviral ceramic products have the problem of being unable to achieve long-lasting and efficient antibacterial effects, and the preparation process is relatively complicated. How to provide a ceramic product that has both antibacterial and antiviral effects and excellent performance, excellent ceramic strength and wear resistance, simple preparation method, and low cost is a difficult problem facing us. Summary of the invention

[0007] In order to solve or partially solve the problems existing in the related art, the present invention provides an antibacterial and antiviral low-temperature glaze and a preparation method thereof, an antibacterial and antiviral ceramic vessel and a preparation method thereof. When the ceramic vessel comes into contact with microorganisms such as bacteria and viruses during use, it can quickly and efficiently kill bacteria and viruses without affecting the strength, wear resistance and appearance of the ceramic vessel, and no harmful components are produced during use, and no pollution is caused to the environment.

[0008] The first aspect of the present application provides an antibacterial and antiviral low-temperature glaze, which comprises the following components by weight percentage: 55-70% frit, 2-6% suspending agent, 20-30% water, 2-5% coupling agent, and 1.5-3% nano-composite antibacterial and antiviral material.

[0009] The nano-composite antibacterial and antiviral material includes carbon nitride, graphene and titanium dioxide to form a porous bridging structure. Carbon nitride and graphene form an irregular network bridging structure. Titanium dioxide is bridged by carbon nitride and graphene and embedded in and around the nanopores of the porous bridging structure to form a nano-multi-level porous material.

[0010] The second aspect of the present invention application provides a method for preparing an antibacterial and antiviral low-temperature glaze, comprising the following steps:

[0011] (1) According to the components of low-temperature glaze, accurately weigh the required ingredients using an electronic balance;

[0012] (2) grinding and pulverizing the raw materials in a wet ball mill at a mass ratio of raw materials: ball milling balls: water = 1: (2-2.5): 0.6 for 15 to 20 minutes to obtain a glaze slurry with uniform particle size;

[0013] (3) The glaze slurry in step (2) is filtered through a 300-mesh sieve to obtain a final low-temperature glaze.

[0014] Furthermore, the final low-temperature glaze has a fineness of 0.2 to 0.5 and a specific gravity of 1.7 to 1.75.

[0015] The third aspect of the present invention application provides a method for preparing an antibacterial and antiviral ceramic vessel, comprising the following steps:

[0016] (1) Mix the ingredients accurately according to the formula, grind in a wet ball mill, and meet the ratio of material: ball mill: water = 1:1.5-2:0.7-0.8, grinding time 20 hours. The fineness is 3-5 (250 mesh) on a 10,000-hole sieve;

[0017] (2) Dehydration by filter press, the moisture content of the mud cake is 25-30%;

[0018] (3) The filter press mud cake is vacuum-mixed in a mud mixer to make the mud dense and uniform in moisture;

[0019] (4) The rough mud strips are transported to the mud storage for homogenization and aging for 1 to 2 months to increase plasticity;

[0020] (5) The mud strips taken out from the mud storage are vacuumed for the second time to make the moisture content about 22-25%;

[0021] (6) Plastic forming is performed on a roller press or a drawing machine, and the blank is trimmed after drying and then dried;

[0022] (7) The ceramic vessel body is prepared by slip injection molding, and the body is bisque-fired at 750-800°C to achieve a certain strength and improve the product qualification rate;

[0023] (8) applying high-temperature glaze to the interior of the unglazed body by spraying glaze, and after the high-temperature glaze layer is dried, putting it into the kiln, sintering it at 1000-1300°C for 3-6 hours, and the water absorption rate of the body after sintering is 0;

[0024] (9) applying an antibacterial and antiviral low-temperature glaze to the outer surface of the green body after sintering in step (8) at room temperature and pressure;

[0025] (10) After the glaze is dry, it is sintered at a low temperature of 600-780°C for 5-8 hours to achieve a semi-matte or matte surface that does not absorb red.

[0026] Furthermore, the formula in step (1) is 20-30% kaolin, 20-25% feldspar, 20-25% quartz, 8-10% clay, 10-18% porcelain stone, and 1-2% magnesia clay in terms of weight percentage.

[0027] Furthermore, in step (8), the high-temperature glaze comprises the following components in weight percentage: 40-50% potassium feldspar, 18-25% quartz, 12-20% calcite, 5-10% talc, 5-10% Suzhou clay, 2-5% zinc oxide, and 3-5% barium sulfate.

[0028] Furthermore, the preparation method of the high temperature glaze in step (8) is:

[0029] (1) Accurately mix the ingredients according to the components of high-temperature glaze;

[0030] (2) The above ingredients are mixed with water and then ground in a ball mill, with the ratio of ingredients: ball milling balls: water being 1:2-2.5:0.6;

[0031] (3) Ball milling time: 20 to 24 hours;

[0032] (4) The fineness is 0.3 to 0.5 on a 10,000-hole sieve, and the specific gravity is 1.5 to 1.6.

[0033] The fourth aspect of the present application provides an antibacterial and antiviral ceramic vessel, which is prepared by the above steps.

[0034] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present invention.

[0035] Beneficial technical effects of the present invention:

[0036] The method for preparing antibacterial and antiviral functional ceramics provided by the present invention first sprays a layer of high-temperature glaze on the inner surface of the unglazed ceramic blank. After high-temperature sintering, the usability and strength of the ceramic product can be improved, and the quality meets the requirements of national standards and has ceramic usability. Then, the outer surface of the ceramic vessel sintered with high-temperature glaze (water absorption rate is 0) is glazed with low-temperature glaze under normal temperature and pressure conventional operation to evenly mix the antibacterial and antiviral material with the glaze and spray it on the outer surface. Firing at a low temperature of 600 to 780°C will not destroy the composition and efficacy of the antibacterial and antiviral material. The low-temperature glaze does not contain lead and is non-toxic and harmless. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1It is the scanning electron microscope element distribution map in the present invention application; DETAILED DESCRIPTION

[0038] The optional embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the optional embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0039] The terms used in this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The singular forms of "a", "said" and "the" used in this application and the appended claims are also intended to include plural forms unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0040] The following is a detailed description of the antibacterial and antiviral low-temperature glaze and its preparation method, antibacterial and antiviral ceramic ware and its preparation method in conjunction with the accompanying drawings, as follows:

[0041] The invention discloses an antibacterial and antiviral low-temperature glaze, which comprises the following components by weight percentage: 55-70% of frit, 2-6% of suspending agent, 20-30% of water, 2-5% of coupling agent and 1.5-3% of nano composite antibacterial and antiviral material.

[0042] The nano-composite antibacterial and antiviral material includes carbon nitride, graphene and titanium dioxide to form a porous bridge structure, carbon nitride and graphene form a random network bridge structure, titanium dioxide is bridged by carbon nitride and graphene, and is embedded in and around the nanopores of the porous bridge structure to form a nano-multi-level porous material. Under visible light irradiation, the nano-composite material can utilize the nanopores to strengthen the enrichment effect of free radicals released by titanium dioxide, can quickly and efficiently inactivate a variety of bacteria and viruses, and inhibit their growth and reproduction on the surface of objects.

[0043] A method for preparing an antibacterial and antiviral low-temperature glaze comprises the following steps:

[0044] (1) According to the components of low-temperature glaze, accurately weigh the required ingredients using an electronic balance;

[0045] (2) grinding and pulverizing the raw materials in a wet ball mill at a mass ratio of raw materials: ball milling balls: water = 1: (2-2.5): 0.6 for 15 to 20 minutes to obtain a glaze slurry with uniform particle size;

[0046] (3) The glaze slurry in step (2) is filtered through a 300-mesh sieve to obtain a final low-temperature glaze.

[0047] In one embodiment of the present invention, the final low-temperature glaze has a fineness of 0.2-0.5 and a specific gravity of 1.7-1.75.

[0048] A method for preparing an antibacterial and antiviral ceramic vessel comprises the following steps:

[0049] (1) Mix the ingredients accurately according to the formula, grind in a wet ball mill, and meet the ratio of material: ball mill: water = 1:1.5-2:0.7-0.8, grinding time 20 hours. The fineness is 3-5 (250 mesh) on a 10,000-hole sieve;

[0050] (2) Dehydration by filter press, the moisture content of the mud cake is 25-30%;

[0051] (3) The filter press mud cake is vacuum-mixed in a mud mixer to make the mud dense and uniform in moisture;

[0052] (4) The rough mud strips are transported to the mud storage for homogenization and aging for 1 to 2 months to increase plasticity;

[0053] (5) The mud strips taken out from the mud storage are vacuumed for the second time to make the moisture content about 22-25%;

[0054] (6) Plastic forming is performed on a roller press or a blank drawing machine, and the blank is trimmed after drying and then dried;

[0055] (7) The ceramic vessel body is prepared by slip injection molding, and the body is bisque-fired at 750-800°C to achieve a certain strength and improve the product qualification rate;

[0056] (8) applying high-temperature glaze to the interior of the unglazed body by spraying glaze, and after the high-temperature glaze layer is dried, putting it into the kiln, sintering it at 1000-1300°C for 3-6 hours, and the water absorption rate of the body after sintering is 0;

[0057] (9) applying an antibacterial and antiviral low-temperature glaze to the outer surface of the green body after sintering in step (8) at room temperature and pressure;

[0058] (10) After the glaze is dry, it is sintered at a low temperature of 600-780°C for 5-8 hours to achieve a semi-matte or matte surface that does not absorb red.

[0059] In one embodiment of the present invention, the formula in step (1) is 20-30% kaolin, 20-25% feldspar, 20-25% quartz, 8-10% clay, 10-18% china stone, and 1-2% magnesia clay in weight percentage.

[0060] In one embodiment of the present invention, the high-temperature glaze in step (8) comprises the following components in weight percentage: 40-50% potassium feldspar, 18-25% quartz, 12-20% calcite, 5-10% talc, 5-10% Suzhou clay, 2-5% zinc oxide, and 3-5% barium sulfate.

[0061] In one embodiment of the present invention, the preparation method of the high temperature glaze in step (8) is:

[0062] (1) Accurately mix the ingredients according to the components of high-temperature glaze;

[0063] (2) The above ingredients are mixed with water and then ground in a ball mill, with the ratio of ingredients: ball milling balls: water being 1:2-2.5:0.6;

[0064] (3) Ball milling time: 20 to 24 hours;

[0065] (4) The fineness is 0.3 to 0.5 on a 10,000-hole sieve, and the specific gravity is 1.5 to 1.6.

[0066] An antibacterial and antiviral ceramic vessel is prepared by the above steps.

[0067] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present invention.

[0068] For the purpose of greater clarity, the invention is described in detail through the following examples.

[0069] Example 1

[0070] This embodiment uses a nano-composite antibacterial and antiviral material, which is prepared using a national invention patent technology (patent number: CN113045913B).

[0071] This embodiment also provides a method for preparing an antibacterial and antiviral ceramic vessel, including a vessel body and a high-temperature glaze sprayed inside the body, and a low-temperature glaze sprayed on the outer surface of the body. The body ingredients are as follows, calculated by mass percentage: 26% kaolin, 23% feldspar, 23% quartz, 9% clay, 18% porcelain stone, and 1% magnesia soil. The high-temperature glaze ratio is: 40% potassium feldspar, 23% quartz, 16% calcite, 6% talc, 8% Suzhou soil, 3% zinc oxide, and 4% barium sulfate. The low-temperature antibacterial and antiviral glaze ratio is: 60% frit, 4% suspending agent, 26% water, 4.5% coupling agent, and 1.5% nano-composite antibacterial and antiviral material.

[0072] (1) firing into a green body according to the ceramic raw material formula, the firing temperature is 750°C, and the firing time is 5 hours;

[0073] (2) spraying high-temperature glaze on the inner surface of the blank, drying it, and sintering it in a furnace at 1100° C. for 4.5 hours;

[0074] (3) After the sintering in step (2), the water absorption rate of the outer surface of the green body is 0. Under normal temperature and pressure, the antibacterial and antiviral low-temperature glaze is sprayed on the outer surface of the green body.

[0075] (4) The vessel is sintered in a Jingdezhen ceramic furnace at 600° C. for 6 hours to obtain a finished antibacterial and antiviral vessel.

[0076] Example 2

[0077] This embodiment uses a nano-composite antibacterial and antiviral material, which is prepared using a national invention patent technology (patent number: CN 113045913B).

[0078] This embodiment also provides a method for preparing an antibacterial and antiviral ceramic vessel, including a vessel body and a high-temperature glaze sprayed inside the body, and a low-temperature glaze sprayed on the outer surface of the body. The body ingredients are as follows, calculated by mass percentage: 28% kaolin, 23% feldspar, 23% quartz, 10% clay, 15% porcelain stone, and 1% magnesia soil. The high-temperature glaze ratio is: 42% potassium feldspar, 20% quartz, 17% calcite, 8% burned talc, 7% Suzhou soil, 2.5% zinc oxide, and 3.5% barium sulfate. The low-temperature antibacterial and antiviral glaze ratio is: 64% frit, 4% suspending agent, 25% water, 5% coupling agent, and 2% nano-composite antibacterial and antiviral material.

[0079] (1) firing into a green body according to the ceramic raw material formula, the firing temperature is 780°C, and the firing time is 5 hours;

[0080] (2) spraying high temperature glaze on the inner surface of the blank, drying it, and sintering it in a furnace at 1150°C for 4 hours;

[0081] (3) After the sintering in step (2), the water absorption rate of the outer surface of the green body is 0. Under normal temperature and pressure, the antibacterial and antiviral low-temperature glaze is sprayed on the outer surface of the green body.

[0082] (4) The vessel is sintered in a Jingdezhen ceramic furnace at 650° C. for 6 hours to obtain a finished antibacterial and antiviral vessel.

[0083] Example 3

[0084] This embodiment uses a nano-composite antibacterial and antiviral material, which is prepared using a national invention patent technology (patent number: CN113045913B).

[0085] This embodiment also provides an antibacterial and antiviral ceramic vessel, including a vessel body and a high-temperature glaze sprayed inside the body, and a low-temperature glaze sprayed on the outer surface of the body. The body ingredients are as follows, calculated by mass percentage: 25% kaolin, 24% feldspar, 24% quartz, 10% clay, 16% porcelain stone, and 1% magnesia soil. The high-temperature glaze ratio is: 46% potassium feldspar, 20% quartz, 14% calcite, 8% burned talc, 6% Suzhou soil, 3% zinc oxide, and 3% barium sulfate. The low-temperature antibacterial and antiviral glaze ratio is: 65% frit, 5% suspending agent, 24% water, 3% coupling agent, and 3% nano-composite antibacterial and antiviral material.

[0086] (1) firing the ceramic raw material into a green body according to the ceramic raw material formula, the firing temperature is 800°C, and the firing time is 5 hours;

[0087] (2) spraying high temperature glaze on the inner surface of the blank, drying it, and sintering it in a furnace at 1200°C for 4 hours;

[0088] (3) After the sintering in step (2), the water absorption rate of the outer surface of the green body is 0. Under normal temperature and pressure, the antibacterial and antiviral low-temperature glaze is sprayed on the outer surface of the green body.

[0089] (4) The ceramic vessel is sintered in a Jingdezhen ceramic furnace at 700° C. for 5 hours to obtain a finished antibacterial and antiviral vessel.

[0090] Comparative Example 1

[0091] The only difference from Example 1 is that in this comparative example 1, no nano-composite antibacterial and antiviral material is added to the low-temperature glaze, and the missing weight proportion is supplemented with frit, and the remaining raw materials and preparation method are the same as those in Example 1.

[0092] Comparative Example 2

[0093] The only difference from Example 2 is that in this comparative example 2, no nano-composite antibacterial and antiviral material is added to the low-temperature glaze, and the missing weight proportion is supplemented with frit, and the remaining raw materials and preparation method are the same as those in Example 2.

[0094] Comparative Example 3

[0095] The only difference from Example 3 is that in this comparative example 3, no nano-composite antibacterial and antiviral material is added to the low-temperature glaze, and the missing weight proportion is supplemented with frit, and the remaining raw materials and preparation method are the same as those in Example 3.

[0096] Evaluation of antibacterial and antiviral properties:

[0097] The antibacterial properties of the ceramic products prepared in Examples 1 to 3 and Comparative Examples 1 to 3 of the present invention were tested according to the standard JC / T 897-2014 "Antibacterial Properties of Antibacterial Ceramic Products". The antiviral properties of the ceramic products prepared in Examples 1 to 3 and Comparative Examples 1 to 3 of the present invention were tested according to the NASBA test method in the standard GB / T 19440-2004.

[0098] The test results of the antibacterial and antiviral properties of the ceramic vessels prepared in Examples 1 to 3 and Comparative Examples 1 to 3 are shown in Table 1.

[0099] Table 1

[0100]

[0101]

[0102] As shown in Table 1, the antibacterial and antiviral ceramic vessels prepared in Examples 1 to 3 have excellent performance, with an average antibacterial rate of 98.45% against Escherichia coli, an average antibacterial rate of 97.83% against Staphylococcus aureus, and an average activity rate of 98.13% against H1N1 influenza A virus; the antibacterial and antiviral performance in Example 3 is better than that in Examples 1 and 2 because the mass ratio of antibacterial and antiviral materials added to the low-temperature glaze is greater than that in Examples 1 and 2, which indicates that the higher the content of nano-composite antibacterial and antiviral materials, the better the antiviral performance. The products prepared in Comparative Examples 1 to 3 do not add nano-composite antibacterial and antiviral materials, so the products do not have the corresponding functions.

[0103] In addition, the prepared antibacterial and antiviral material was characterized by scanning electron microscope energy dispersive spectrometer (SEM-EDS) on the surface of the material. The results showed that the patent of the present invention is very effective in combining antibacterial and antiviral photocatalytic composite materials. The distribution of nanocomposites in the glaze is very uniform, and the absorption of light sources is very effective. Scanning electron microscope element distribution map ( Figure 1 ) shows that except for organic elements such as C and N (background noise), the nanocomposite material covers all areas of the material. The material characterization results show that the coverage of the nanocomposite material is very high. This also explains why the material has excellent antibacterial and antiviral properties.

[0104] In summary, the present invention provides a nano-composite antibacterial and antiviral material, which has good antibacterial and antiviral effects. It is added to a low-temperature glaze and sprayed on the surface of a ceramic vessel. After low-temperature sintering, a glaze layer with antibacterial and antiviral functions can be formed on the surface of the device, thereby achieving the overall antibacterial and antiviral effect of the ceramic vessel.

[0105] By adding antibacterial and antiviral materials to the surface of the glaze, the long-lasting antibacterial and antiviral effects of ceramic vessels can be achieved; by using low-temperature glaze firing devices, the preparation method is energy-saving and efficient, easy to operate, and does not require additional firing processes, and will not affect the original performance and appearance quality of the ceramic vessels; no pollutants are generated during the preparation process, and it is harmless to the environment and has a wide range of applications.

[0106] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A method for preparing an antibacterial and antiviral ceramic vessel, characterized in that: The following steps are involved: (1) Accurately prepare the ingredients according to the formula of the ceramic ware blank, grind it in a wet ball mill, meet the material: ball: water ratio = 1:1.5-2:0.7-0.8, grinding time 20 hours, fineness 3%-5% of the 10,000-hole sieve residue; (2) Dewatering by slurry filter press, the moisture content of the mud cake is 25~30%; (3) The filter press mud cake is vacuum-mixed in a mud mixer to make the mud dense and uniform in moisture; (4) The rough mud strips are transported to the mud storage for homogenization and aging for 1 to 2 months to increase plasticity; (5) The mud strips taken out from the mud storage are vacuumed for the second time to make the moisture content between 22% and 25%; (6) Plastic forming is performed on a roller press or a wheel drawing machine, and the blank is dried, trimmed, and then dried again; (7) The ceramic ware body is prepared by slip injection molding, and the body is bisque fired at 750-800℃ to achieve a certain strength and improve the product qualification rate; (8) Apply high-temperature glaze to the inside of the unglazed body by spraying glaze, wait for the high-temperature glaze layer to dry before putting it into the kiln, sinter at 1000-1300℃ for 3-6 hours, and the water absorption rate of the body after sintering is 0; (9) applying an antibacterial and antiviral low-temperature glaze to the outer surface of the green body after sintering in step (8) at room temperature and pressure; The low-temperature glaze is composed of the following components by weight percentage: 60-70% of frit, 2-6% of suspending agent, 20-30% of water, 2-5% of coupling agent, and 1.5-3% of nano-composite antibacterial and antiviral material; The nano composite antibacterial and antiviral material comprises carbon nitride, graphene and titanium dioxide to form a porous bridge structure, wherein carbon nitride and graphene form a random network bridge structure, and titanium dioxide is bridged by carbon nitride and graphene and embedded in and around the nano pores of the porous bridge structure to form a nano multi-level porous material; (10) After the glaze is dry, it is sintered at a low temperature of 600~780℃; the sintering time is 5~8 hours, and the surface becomes semi-matte or matte and does not absorb red.

2. The method for preparing a ceramic vessel according to claim 1, characterized in that: The formula of step (1) is 20-30% kaolin, 20-25% feldspar, 20-25% quartz, 8-10% clay, 10-18% porcelain stone, and 1-2% magnesia clay in terms of weight percentage.

3. The method for preparing a ceramic vessel according to claim 1, characterized in that: In step (8), the high-temperature glaze comprises the following components in weight percentage: 40-50% potassium feldspar, 18-25% quartz, 12-20% calcite, 5-10% talc, 5-10% Suzhou clay, 2-5% zinc oxide, and 3-5% barium sulfate.

4. The method for preparing a ceramic vessel according to claim 3, characterized in that: The preparation method of the high temperature glaze in step (8) is: (1) Accurately prepare ingredients according to the components of high-temperature glaze; (2) The above ingredients are mixed with water and then ground in a ball mill, with the ratio of material: ball mill: water being 1:2-2.5:0.6; (3) Ball milling time: 20 to 24 hours; (4) The fineness is 0.3%~0.5% of the residue on the 10,000-hole sieve, and the specific gravity is 1.5~1.

6.

5. An antibacterial and antiviral ceramic vessel, characterized in that: Prepared according to the preparation method according to any one of claims 1 to 4.

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