A boiling-resistant and odor-removing antibacterial enamel glaze and its preparation method and application

Abstract

The present invention provides a boiling-resistant, odor-removing antibacterial enamel glaze, as well as its preparation method and application. The raw materials for preparing the boiling-resistant, odor-removing antibacterial enamel glaze include, by weight, 40-50 parts feldspar, 15-25 parts pyroxene, 10-15 parts sodium titanate silico, 4-6 parts cerium oxide, 1-2 parts polyol, 1-3 parts clay, 1-2 parts carbonamide, 0.5-2 parts soda ash, 0.3-0.6 parts barium molybdate, and 3-5 parts nano-zinc oxide. The enamel glaze provided by the present invention exhibits boiling-resistant, long-lasting antibacterial and odor-removing properties, and maintains excellent activity even in high-temperature environments, thereby addressing the problems of bacterial growth and odor lingering in appliances such as electric steamers and steam ovens.

Description

Technical Field

[0001] The invention belongs to the technical field of novel polymer coatings and relates to an enamel glaze, in particular to an antibacterial enamel glaze that is resistant to boiling water and can remove odors, and a preparation method and application thereof. Background Art

[0002] Currently, to meet the diverse needs of households, enameled ovens are often larger. If the oven is not used for extended periods or is not cleaned promptly, residual food and moisture can cause E. coli, Staphylococcus aureus, and other bacteria to grow in the oven, affecting not only the quality of the food but also the health of the user. Furthermore, the oven liner is difficult to disassemble, creating a vicious cycle of contamination and impacting normal user use. As people increasingly prioritize quality of life and household hygiene, they desire sterilization and disinfection capabilities in their household appliances. However, oven liner performance in the industry generally suffers from poor antibacterial and antimicrobial properties, making it difficult to meet national standards.

[0003] Currently, the antimicrobial agents used in antimicrobial enamel layers in the industry generally adopt ionic silver salts such as silver nitrate and titanium silver. The antimicrobial purpose is achieved by adjusting the amount of silver ions added. Silver ions easily volatilize during the heating process, which easily causes waste in the production process and reduces the antimicrobial properties of the enamel. Only the free silver ions precipitated during the process can produce antimicrobial properties. These precipitated anions may be absorbed by the human body through food and cause certain harm. There is currently an antimicrobial enamel cookware with an enamel layer using a photocatalyst as the antimicrobial agent. The photocatalyst requires the action of light to have an antimicrobial effect. The oven liner is in a closed environment, so the photocatalyst does not have antimicrobial ability when used in the oven liner. There is also an antibacterial electric oven enamel liner and its manufacturing method. The antibacterial agent uses nano-silver, nano-copper and nano-silver phosphate antibacterial enamel coating. Since nano-silver and nano-copper are not resistant to high temperature and boiling water, they are easy to agglomerate and oxidize, resulting in uneven antibacterial properties and poor antibacterial durability in the antibacterial enamel layer. The antibacterial effect of the enamel layer of the oven liner using this enamel layer gradually decreases or even disappears during the long-term use of the oven liner in high and low temperatures and water vapor.

[0004] There is also an antibacterial, low-temperature resistant thermal insulation material that improves its antibacterial properties by adding an antibacterial agent composed of silver-loaded zirconium phosphate, etc., and its antibacterial properties are good and the antibacterial durability is good, but a large amount of addition is required to achieve a good antibacterial effect. Since the antibacterial agent is expensive, a large addition amount will increase the cost.

[0005] Electric steamers and steam ovens are kitchen appliances that use electric heating elements to generate heat and steam to cook food. Currently available electric steamers and steam ovens only cook food and do not disinfect or remove odors. Every time an electric steamer or steam oven is used to cook food, odors linger inside. If the appliance is not properly cleaned after each use, residual dirt can cause odors and breed bacteria over time.

[0006] In view of the defects of existing electric steamers and steam ovens such as residual odor and easy breeding of bacteria, it is necessary to provide an antibacterial enamel glaze that is resistant to boiling and has odor removal. Summary of the Invention

[0007] To address the shortcomings of the prior art, the present invention aims to provide a boiling-resistant, odor-removing antibacterial enamel glaze, as well as its preparation method and application. The enamel glaze of the present invention exhibits boiling-resistant, long-lasting antibacterial and odor-removing properties, and maintains excellent activity even in high-temperature environments, thereby addressing the problems of bacterial growth and residual odor in appliances such as electric steamers and steam ovens.

[0008] To achieve this object, the present invention adopts the following technical solutions:

[0009] In a first aspect, the present invention provides an antibacterial enamel glaze that is resistant to boiling water and removes odors. The raw materials for preparing the antibacterial enamel glaze that is resistant to boiling water and removes odors include, by weight: 40 to 50 parts of feldspar, 15 to 25 parts of pyroxene, 10 to 15 parts of sodium silicate titanate, 4 to 6 parts of cerium oxide, 1 to 2 parts of polyol, 1 to 3 parts of clay, 1 to 2 parts of carbonamide, 0.5 to 2 parts of soda ash, 0.3 to 0.6 parts of barium molybdate, and 3 to 5 parts of nano zinc oxide.

[0010] The enamel glaze provided by the present invention has the functions of being resistant to boiling water and having long-lasting antibacterial and deodorizing effects, and can still maintain excellent activity in a high-temperature environment, thereby solving the problems of bacteria breeding and odor residue in equipment such as electric steamers and steam ovens.

[0011] For example, in the raw materials for preparing the boiling-resistant and odor-removing antibacterial enamel glaze, the weight proportion of the feldspar is 40 to 50 parts, for example, 40 parts, 42 parts, 44 parts, 46 parts, 48 ​​parts or 50 parts, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable;

[0012] The weight percentage of the pyroxene is 15 to 25 parts, for example, 15 parts, 17 parts, 19 parts, 21 parts, 23 parts or 25 parts, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable;

[0013] The weight ratio of the sodium titanate is 10 to 15 parts, for example, 10 parts, 11 parts, 12 parts, 13 parts, 14 parts or 15 parts, but is not limited to the values ​​listed, and other values ​​not listed within the numerical range are also applicable;

[0014] The weight ratio of the cerium oxide is 4 to 6 parts, for example, 4 parts, 4.4 parts, 4.8 parts, 5.2 parts, 5.6 parts or 6 parts, but is not limited to the listed values. Other values ​​not listed within the numerical range are also applicable.

[0015] The weight ratio of the polyol is 1 to 2 parts, for example, 1 part, 1.2 parts, 1.4 parts, 1.6 parts, 1.8 parts or 2 parts, but is not limited to the values ​​listed, and other values ​​not listed within the numerical range are also applicable;

[0016] The weight ratio of the clay is 1 to 3 parts, for example, 1 part, 1.4 parts, 1.8 parts, 2.2 parts, 2.6 parts or 3 parts, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable;

[0017] The weight ratio of the carbonic acid amide is 1 to 2 parts, for example, 1 part, 1.2 parts, 1.4 parts, 1.6 parts, 1.8 parts or 2 parts, but is not limited to the values ​​listed, and other values ​​not listed within the numerical range are also applicable;

[0018] The weight ratio of the soda ash is 0.5 to 2 parts, for example, 0.5 parts, 0.8 parts, 1.1 parts, 1.4 parts, 1.7 parts or 2 parts, but is not limited to the values ​​listed, and other values ​​not listed within the numerical range are also applicable;

[0019] The weight portion of the barium molybdate is 0.3 to 0.6 parts, for example, 0.3 parts, 0.4 parts, 0.5 parts or 0.6 parts, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable;

[0020] The weight proportion of the nano zinc oxide is 3 to 5 parts, for example, 3 parts, 3.4 parts, 3.8 parts, 4.2 parts, 4.6 parts or 5 parts, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0021] As a preferred technical solution of the present invention, the feldspar includes any one of potassium feldspar, sodium feldspar or calcium feldspar, or a combination of at least two of them. Typical but non-limiting combinations include: a combination of potassium feldspar and sodium feldspar, a combination of potassium feldspar and calcium feldspar, a combination of sodium feldspar and calcium feldspar, or a combination of potassium feldspar, sodium feldspar and calcium feldspar.

[0022] Preferably, the average particle size of the feldspar is 300-350 mesh, for example, 300 mesh, 310 mesh, 320 mesh, 330 mesh, 340 mesh or 350 mesh, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0023] In the present invention, the feldspar is selected from XH-32 and / or XH-4785 manufactured by Shijiazhuang Xinhui Mineral Products Co., Ltd. Before glaze firing, the feldspar acts as a lean raw material, reducing drying shrinkage and deformation of the green body, improving drying performance, and shortening drying time. During firing, it acts as a flux, lowering the firing temperature and promoting clay melting. Interdiffusion and interpenetration in the liquid phase accelerate the formation of mullite. The resulting feldspar glass fills the gaps between the mullite grains in the green body, densifying the body and reducing voids, thereby improving its mechanical strength and dielectric properties. Furthermore, the formation of feldspar glass enhances the light transmittance and transparency of the green body, imparting it with higher mechanical strength and chemical stability.

[0024] In addition, the weight proportion of the feldspar is 40 to 50 parts. If the content is too much, the antibacterial enamel glaze may break due to brittleness. If the content is too little, the porosity of the antibacterial enamel glaze may increase and the friction resistance may be reduced.

[0025] Preferably, the particle size of the pyroxene is 40 to 80 mesh, for example, 40 mesh, 50 mesh, 60 mesh, 70 mesh or 80 mesh, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0026] Preferably, the pyroxene is selected from Shandong Laizhou Baolailuo Stone Co., Ltd.

[0027] Preferably, the polyol comprises a non-isocyanate polyurethane diol and / or polyethylene glycol.

[0028] In the present invention, during the preparation process of the enamel glaze, the carbon dioxide gas generated by the decomposition of the polyol at high temperature forms a large number of tiny circular pores, thereby obtaining a collapsed pore structure. The collapsed pore structure can absorb nano-zinc oxide and lock it inside, thereby producing antibacterial and deodorizing functions, thereby realizing the long-term antibacterial and deodorizing functions of the enamel glaze.

[0029] Preferably, the average particle size of the nano zinc oxide is 25 to 35 nm, for example, 25 nm, 27 nm, 29 nm, 31 nm, 33 nm or 35 nm, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0030] Preferably, the nano zinc oxide is selected from any one of CS2132PA, CS1952, SHL-CRE1021 or HSL-PA-2021 produced by Guangzhou Zhongxing Nano New Materials Co., Ltd., or a mixture of two thereof.

[0031] In the present invention, the cerium oxide can make the surface of the enamel coating smoother and more compact, and is conducive to the refinement of the precipitated phase, thereby improving the toughness of the enamel coating and reducing the tendency of the coating to break during wear, thereby significantly improving the wear resistance of the enamel coating; its weight proportion is 4 to 6 parts. If its content is too much, the antibacterial enamel glaze will peel off due to excessive brittleness, and if its content is too little, the wear resistance of the antibacterial enamel glaze will be reduced.

[0032] As a preferred technical solution of the present invention, the particle size range of the boiling-resistant, odor-removing antibacterial enamel glaze is D50 = 3 to 8 μm, for example, it can be 3 μm, 3.5 μm, 4 μm, 4.5 μm, 5 μm, 5.5 μm, 6 μm, 6.5 μm, 7 μm, 7.5 μm or 8 μm, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0033] In a second aspect, the present invention provides a method for preparing the antibacterial enamel glaze that is resistant to boiling water and has a deodorizing effect, as provided in the first aspect, the preparation method comprising the following steps:

[0034] The raw materials for preparing the antibacterial enamel glaze capable of resisting boiling in water and removing odor are mixed according to the formula, stirred evenly, and then sintered, ground and aged in sequence to obtain the antibacterial enamel glaze capable of resisting boiling in water and removing odor.

[0035] As a preferred technical solution of the present invention, the sintering temperature is 900-1000°C, for example, it can be 900°C, 920°C, 940°C, 960°C, 980°C or 1000°C, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0036] Preferably, the sintering time is 1 to 2 hours, for example, 1 hour, 1.2 hours, 1.4 hours, 1.6 hours, 1.8 hours or 2 hours, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0037] In the present invention, the purpose of sintering is to increase the degree of alloying of the sintered body, enhance the metallurgical bonding surface between particles, and reduce porosity and spheroidization; if the sintering temperature is too high, the green body will begin to deform, soften, and expand due to overburning, while if the sintering temperature is too low, the porosity will increase.

[0038] In addition, the polyol in the raw materials for preparing the enamel glaze of the present invention forms a depressed pore structure during the sintering process, which realizes the adsorption of nano-zinc oxide, so that the nano-zinc oxide is locked inside the coating during use and will not be freed, thereby realizing that the enamel glaze has long-lasting antibacterial and deodorizing functions.

[0039] As a preferred technical solution of the present invention, the grinding time is 80 to 140 minutes, for example, it can be 80 minutes, 100 minutes, 120 minutes or 140 minutes, but is not limited to the listed values. Other values ​​not listed within the numerical range are also applicable.

[0040] Preferably, the static aging time is 4 to 5 hours, for example, 4 hours, 4.2 hours, 4.4 hours, 4.6 hours, 4.8 hours or 5 hours, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0041] In a third aspect, the present invention provides a use of the antibacterial enamel glaze with boiling resistance and deodorization as provided in the first aspect, wherein the antibacterial enamel glaze with boiling resistance and deodorization is used for preparing enameled metal products.

[0042] As a preferred technical solution of the present invention, the method for preparing the enameled metal product comprises the following steps:

[0043] The metal substrate is sandblasted with corundum, and after cleaning, the metal substrate is powder-sprayed with enamel glaze. After high-temperature treatment, a metal product with an enamel coating is obtained.

[0044] As a preferred technical solution of the present invention, the particle size of the corundum is 40 to 60 mesh, for example, it can be 40 mesh, 44 mesh, 48 mesh, 52 mesh, 56 mesh or 60 mesh, but is not limited to the listed values. Other values ​​not listed within the numerical range are also applicable.

[0045] Preferably, the pressure of the sandblasting treatment is 0.4-0.6 MPa, for example, it can be 0.4 MPa, 0.44 MPa, 0.48 MPa, 0.52 MPa, 0.56 MPa or 0.6 MPa, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0046] Preferably, the cleanliness Sa of the metal substrate after sandblasting is ≥ 2.5, for example, it can be 2.5, 2.6, 2.7, 2.8, 2.9 or 3.0, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0047] Preferably, the roughness Rz of the metal substrate after sandblasting is ≥ 20 μm, for example, it can be 20 μm, 22 μm, 24 μm, 26 μm, 28 μm or 30 μm, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0048] Preferably, the cleaning process includes ultrasonic cleaning and drying processes performed sequentially.

[0049] The sandblasting treatment of the present invention can not only clean the surface of the metal substrate, but also increase the surface roughness of the metal substrate, which is beneficial to increasing the bonding strength between the enamel coating and the substrate.

[0050] Preferably, the powder spraying process includes electrostatic powder spraying process.

[0051] Preferably, the adsorption amount of the enamel glaze in the electrostatic powder spraying treatment is 150 to 200 g, for example, it can be 150 g, 160 g, 170 g, 180 g, 190 g or 200 g, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0052] Preferably, the temperature of the high temperature treatment is 830-870°C, for example, 830°C, 840°C, 850°C, 860°C or 870°C, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0053] Preferably, the high temperature treatment time is 8 to 12 minutes, for example, 8 minutes, 9 minutes, 10 minutes, 11 minutes or 12 minutes, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0054] In the present invention, the purpose of the high-temperature treatment is to interconnect the solid particles in the enamel frit, causing grain growth, reducing voids (pores) and grain boundaries, increasing density, and ultimately forming a hard polycrystalline sintered body. If the high-temperature treatment temperature is too high, the body will begin to deform, soften, and expand due to overheating. If the temperature is too low, the porosity will increase.

[0055] Preferably, the thickness of the enamel coating is 150 to 500 μm, for example, it can be 150 μm, 200 μm, 250 μm, 300 μm, 350 μm, 400 μm, 450 μm or 500 μm, but is not limited to the listed values. Other values ​​not listed within the numerical range are also applicable; preferably, it is 200 to 350 μm.

[0056] As a preferred technical solution of the present invention, the method for preparing enameled metal products using the antibacterial enamel glaze that is resistant to boiling water and has odor removal, provided by the present invention, comprises the following steps:

[0057] (1) Use corundum with a particle size of 40 to 60 mesh to sandblast the metal substrate and clean it for later use;

[0058] The pressure of the sandblasting treatment is 0.4-0.6 MPa, and the cleanliness Sa of the metal substrate after the sandblasting treatment is ≥2.5, and the roughness Rz is ≥20 μm;

[0059] (2) Powder coating the metal substrate with enamel glaze, and then high-temperature treatment at 830-870°C for 8-12 minutes to obtain a metal product with an enamel coating having a thickness of 150-500 μm;

[0060] The preparation method of the enamel glaze comprises: mixing the raw materials for preparing the boiling-resistant, odor-removing antibacterial enamel glaze according to the formula, stirring evenly, sintering at a temperature of 900-1000° C. for 1-2 hours, grinding for 80-140 minutes, and then aging for 4-5 hours;

[0061] The powder spraying treatment includes electrostatic powder spraying treatment; the adsorption amount of the enamel glaze in the electrostatic powder spraying treatment is 150-200g.

[0062] The numerical range described in the present invention includes not only the point values ​​listed above, but also any point values ​​between the above numerical ranges that are not listed. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the range.

[0063] Compared with the prior art, the present invention has the following beneficial effects:

[0064] (1) The enamel coating provided by the present invention is resistant to boiling water. After being soaked in 50°C distilled water for 7 days, it still has excellent antibacterial and odor-removing properties against Escherichia coli and Staphylococcus aureus.

[0065] (2) The enamel coating provided by the present invention has long-lasting antibacterial and deodorizing functions. The recessed pore structure thereof can lock the nano-zinc oxide inside and prevent it from being released, so that the antibacterial and deodorizing functions have the same service life as the enamel layer;

[0066] (3) The preparation method of the enamel coating provided by the present invention is simple, and the enamel coating and the metal substrate have a strong bonding force. DETAILED DESCRIPTION

[0067] The technical solution of the present invention is further described below by way of specific embodiments. It should be understood by those skilled in the art that the embodiments are merely to help understand the present invention and should not be regarded as specific limitations of the present invention.

[0068] Examples 1-6

[0069] An antibacterial enamel glaze that is resistant to boiling water and removes odors, wherein the antibacterial enamel glaze that is resistant to boiling water and removes odors comprises the raw materials described in Table 1, specifically as follows, in parts by weight:

[0070] Table 1

[0071] Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 feldspar 40 44 50 45 47 50 pyroxene 25 22 24 23 24 15 Sodium silicate titanate 15 15 14 15 14 14.4 Cerium oxide 6 6 4 6 5 6 polyols 2 1.8 1.4 1.5 1 2 clay 3 3 1 2.5 2 3 Carbonamide 1.4 2 1 1 1.5 2 soda ash 2 1.5 0.6 2 2 2 Barium molybdate 0.6 0.5 0.3 0.5 0.5 0.6 Nano zinc oxide 5 4.2 3.7 3.5 3 5

[0072] The average particle size of the feldspar is 350 meshes, the particle size of the pyroxene is 60 meshes, the polyol includes non-isocyanate polyurethane diol and polyethylene glycol, and the average particle size of the nano zinc oxide is 30 nm.

[0073] Comparative Examples 1-6

[0074] An antibacterial enamel glaze that is resistant to boiling water and removes odors, wherein the antibacterial enamel glaze that is resistant to boiling water and removes odors comprises the raw materials described in Table 2, specifically as follows, in parts by weight:

[0075] Table 2

[0076]

[0077]

[0078] The average particle size of the feldspar is 350 meshes, the particle size of the pyroxene is 60 meshes, the polyol includes non-isocyanate polyurethane diol and polyethylene glycol, and the average particle size of the nano zinc oxide is 30 nm.

[0079] Comparative Example 7

[0080] This comparative example provides an antibacterial enamel glaze that is resistant to boiling water and removes odors. The raw materials for preparing the enamel glaze differ from those in Example 1 only in that:

[0081] In this comparative example, the nano zinc oxide is adjusted to an equal weight of a silver salt antibacterial agent (silver activated carbon).

[0082] Comparative Example 8

[0083] This comparative example provides an antibacterial enamel glaze that is resistant to boiling water and removes odors. The raw materials for preparing the enamel glaze differ from those in Example 1 only in that:

[0084] In this comparative example, the nano zinc oxide is adjusted to an equal weight of copper salt antibacterial agent (copper oxychloride and copper hydroxide).

[0085] Application Example 1

[0086] This application example provides a method for preparing an enameled metal product using the raw materials provided in Example 1, the method comprising the following steps:

[0087] (1) Use corundum with a particle size of 50 mesh to sandblast the metal substrate and clean it for later use;

[0088] The pressure of the sandblasting treatment is 0.5 MPa, and the cleanliness Sa of the metal substrate after the sandblasting treatment is 2.5, and the roughness Rz is 25 μm;

[0089] (2) The metal substrate was powder-coated with enamel glaze and subjected to high-temperature treatment at 850°C for 10 min to obtain a metal product with an enamel coating having a thickness of 250 μm;

[0090] The preparation method of the enamel glaze comprises: mixing the raw materials for preparing the antibacterial enamel glaze having water resistance and odor removal according to the formula, stirring evenly, sintering at 950° C. for 1.5 hours, grinding for 110 minutes, and then aging for 4.5 hours;

[0091] The powder spraying treatment includes electrostatic powder spraying treatment; the adsorption amount of the enamel glaze in the electrostatic powder spraying treatment is 175g.

[0092] Application Example 2

[0093] This application example provides a method for preparing an enameled metal product using the raw materials provided in Example 2, the method comprising the following steps:

[0094] (1) Use corundum with a particle size of 40 mesh to sandblast the metal substrate and clean it for later use;

[0095] The pressure of the sandblasting treatment is 0.4 MPa, and the cleanliness Sa of the metal substrate after the sandblasting treatment is 2.5, and the roughness Rz is 20 μm;

[0096] (2) The metal substrate was powder-coated with enamel glaze and subjected to high-temperature treatment at 830°C for 12 minutes to obtain a metal product with an enamel coating having a thickness of 200 μm;

[0097] The preparation method of the enamel glaze comprises: mixing the raw materials for preparing the antibacterial enamel glaze with water resistance and odor removal according to the formula, stirring evenly, sintering at 900° C. for 2 hours, grinding for 140 minutes, and then aging for 4 hours;

[0098] The powder spraying treatment includes electrostatic powder spraying treatment; the adsorption amount of the enamel glaze in the electrostatic powder spraying treatment is 150g.

[0099] Application Example 3

[0100] This application example provides a method for preparing an enameled metal product using the raw materials provided in Example 3, the method comprising the following steps:

[0101] (1) Use corundum with a particle size of 60 mesh to sandblast the metal substrate and clean it for later use;

[0102] The pressure of the sandblasting treatment is 0.6 MPa, and the cleanliness Sa of the metal substrate after the sandblasting treatment is 3.5, and the roughness Rz is 35 μm;

[0103] (2) The metal substrate was powder-coated with enamel glaze and subjected to high-temperature treatment at 870°C for 12 minutes to obtain a metal product with an enamel coating having a thickness of 280 μm;

[0104] The preparation method of the enamel glaze comprises: mixing the raw materials for preparing the antibacterial enamel glaze with water resistance and odor removal according to the formula, stirring evenly, sintering at a temperature of 1000° C. for 1 hour, grinding for 80 minutes, and then aging for 5 hours;

[0105] The powder spraying treatment includes electrostatic powder spraying treatment; the adsorption amount of the enamel glaze in the electrostatic powder spraying treatment is 200g.

[0106] Application Examples 4-6

[0107] A method for preparing enameled metal products using the boiling-resistant, odor-removing antibacterial enamel glaze raw materials provided in Examples 4-6, the method being the same as that in Application Example 1.

[0108] Application Example 7

[0109] This application example provides a method for preparing an enameled metal product using the raw materials provided in Example 1. The method differs from Application Example 1 only in that:

[0110] In this application example, the temperature of the high-temperature treatment in step (2) is adjusted to 800°C.

[0111] Application Example 8

[0112] This application example provides a method for preparing an enameled metal product using the raw materials provided in Example 1. The method differs from Application Example 1 only in that:

[0113] In this application example, the temperature of the high-temperature treatment in step (2) is adjusted to 900°C.

[0114] Application Example 9

[0115] This application example provides a method for preparing an enameled metal product using the raw materials provided in Example 1. The method differs from Application Example 1 only in that:

[0116] In this application example, the sintering temperature in the preparation method of the enamel glaze in step (2) is adjusted to 850°C.

[0117] Application Example 10

[0118] This application example provides a method for preparing an enameled metal product using the raw materials provided in Example 1. The method differs from Application Example 1 only in that:

[0119] In this application example, the sintering temperature in the preparation method of the enamel glaze in step (2) is adjusted to 1050°C.

[0120] Comparative Application Examples 1-8

[0121] A method for preparing enameled metal products using the boiling-resistant, odor-removing antibacterial enamel glaze raw materials provided in Comparative Examples 1-8, the method being the same as that in Application Example 1.

[0122] Performance testing:

[0123] The enamel coatings provided in the above application examples and comparative application examples were immersed in 50°C distilled water for 7 days and then subjected to performance tests:

[0124] (1) According to the "GB / T 21551.2-2010 Annex A Antibacterial Performance Test Method (Film Method) and Effect Evaluation", the enamel coatings after boiling were tested for antibacterial properties against common infectious bacteria (such as Escherichia coli and Staphylococcus aureus). The results are shown in Table 3.

[0125] The calculation formula of antibacterial rate is: Antibacterial rate (%) = [(number of viable bacteria in control sample - number of viable bacteria in antibacterial enamel metal products) / number of viable bacteria in control sample] × 100%

[0126] (2) According to GB 21551.4-2010 Standard for Particular Requirements for Household and Similar Electrical Appliances with Antibacterial, Sterilizing and Purifying Functions for Refrigerators, the deodorizing function of the enamel coating after boiling in water was tested. The results are shown in Table 3.

[0127] Table 3

[0128]

[0129] According to Table 3, we can know the following:

[0130] (1) Comprehensive analysis of Application Examples 1-6 shows that the enamel coating provided by the present invention has the functions of being resistant to boiling and having a long-lasting antibacterial and deodorizing effect. After boiling, it has excellent antibacterial properties against Escherichia coli and Staphylococcus aureus; it also has excellent removal performance against methyl mercaptan and trimethylamine. The antibacterial property of the enamel coating can still reach 99.9%, and the deodorizing ability can reach 99.8%;

[0131] (2) Comprehensive analysis of Application Examples 1 and 7-10 shows that the process parameters in the coating preparation process will affect the coating thickness, and thus affect the performance of the coating;

[0132] Among them, the high temperature treatment temperature during the coating preparation process will affect the mutual bonding of the solid particles in the enamel layer, grain growth, enlargement of the voids (pores), and increase in density. Inappropriate high temperature treatment temperature will lead to the loss of nano zinc oxide. The sintering temperature in the preparation method of enamel glaze will increase the metallurgical bonding surface between the particles, affecting the porosity and spheroidization. Inappropriate sintering temperature will cause the loss of nano zinc oxide.

[0133] (3) Comprehensive analysis of Application Example 1 and Comparative Application Examples 1-6 shows that the content of the ingredients in the enamel glaze formula affects the coating performance;

[0134] Among them, the content of the feldspar will affect the deodorizing ability of the coating; the addition of excessive feldspar will cause white particles to appear on the surface of the coating. When the coating enamel is sintered, barium molybdate (adhesive) reacts with the metal matrix to produce gases such as CO, H2, and CO2. During cooling, some of the gases are not discharged, resulting in the formation of a uniformly distributed and multi-porous cross-sectional structure in the coating. During the water boiling test, OH - It will enter the pores, destroy the coating structure, cause the loss of nano zinc oxide and make the deodorization performance ineffective;

[0135] The cerium oxide content affects the odor removal ability of the coating. The presence of cerium oxide makes the surface of the enamel coating smoother and more compact, and is conducive to the refinement of the precipitated phase. It can also improve the toughness of the enamel coating and reduce the tendency of the coating to break during testing, thereby significantly improving the performance of the enamel coating, protecting the stability of the enamel coating, and locking the nano-zinc oxide material.

[0136] The polyol is an important component that provides the collapsed pore structure for the nano-zinc oxide. If the polyol is omitted, the nano-zinc oxide cannot be evenly dispersed and embedded in the enamel coating.

[0137] The nano zinc oxide has antibacterial and deodorizing properties, but if its content is too high, it will cause agglomeration during the preparation of enamel powder, affecting the enameling rate;

[0138] (4) Comprehensive analysis of application example 1 and comparative application examples 7-8 shows that compared with nano zinc oxide, after boiling in water, the silver salt and copper salt antibacterial agents are free in the coating and cannot achieve antibacterial and odor removal.

[0139] In summary, the enamel glaze provided by the present invention has the functions of being resistant to boiling water and having long-lasting antibacterial and deodorizing effects, and can still maintain excellent activity in a high-temperature environment, thereby solving the problems of bacterial growth and odor residue in equipment such as electric steamers and steam ovens.

[0140] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An antibacterial enamel glaze that is resistant to boiling water and removes odors, characterized in that: The raw materials for preparing the boiling-resistant, odor-removing antibacterial enamel glaze include, by weight, 40-50 parts of feldspar, 15-25 parts of pyroxene, 10-15 parts of sodium silicate titanate, 4-6 parts of cerium oxide, 1-2 parts of polyol, 1-3 parts of clay, 1-2 parts of carbonamide, 0.5-2 parts of soda ash, 0.3-0.6 parts of barium molybdate, and 3-5 parts of nano zinc oxide.

2. The antibacterial enamel glaze with boiling resistance and deodorization according to claim 1, characterized in that: The feldspar includes any one of potassium feldspar, sodium feldspar or calcium feldspar, or a combination of at least two thereof; The average particle size of the feldspar is 300-350 mesh; The particle size of the pyroxene is 40-80 mesh.

3. The antibacterial enamel glaze with boiling resistance and deodorization according to claim 1, characterized in that: The polyol includes a non-isocyanate polyurethane diol and / or polyethylene glycol.

4. The antibacterial enamel glaze with boiling resistance and deodorization according to claim 1, characterized in that: The average particle size of the nano zinc oxide is 25-35 nm.

5. The antibacterial enamel glaze with boiling resistance and deodorization according to claim 1, characterized in that: The particle size range of the boiling-resistant and odor-removing antibacterial enamel material is D50=3-8 μm.

6. A method for preparing the antibacterial enamel glaze with boiling resistance and deodorization according to any one of claims 1 to 5, characterized in that: The preparation method comprises the following steps: The raw materials for preparing the antibacterial enamel glaze capable of resisting boiling in water and removing odor are mixed according to the formula, stirred evenly, and then sintered, ground and aged in sequence to obtain the antibacterial enamel glaze capable of resisting boiling in water and removing odor.

7. The preparation method according to claim 6, characterized in that The sintering temperature is 900-1000°C; The sintering time is 1 to 2 hours.

8. The preparation method according to claim 6, characterized in that The grinding time is 80 to 140 minutes.

9. The preparation method according to claim 6, characterized in that The static aging time is 4 to 5 hours.

10. An application of the antibacterial enamel material having boiling resistance and deodorization properties according to any one of claims 1 to 5, characterized in that: The antibacterial enamel glaze capable of resisting boiling water and removing odor is used for preparing enamel metal products.

11. The use according to claim 10, characterized in that The preparation method of the enameled metal product comprises the following steps: The metal substrate is sandblasted, cleaned, and then powder-coated with enamel glaze. After high-temperature treatment, a metal product with an enamel coating is obtained.

12. The use according to claim 11, characterized in that The particle size of the corundum used in the sandblasting process is 40-60 mesh; The pressure of the sandblasting treatment is 0.4~0.6MPa; After the sandblasting treatment, the cleanliness Sa of the metal substrate is ≥2.5, and the roughness Rz is ≥20 μm.

13. The use according to claim 11, characterized in that The powder spraying treatment includes electrostatic powder spraying treatment; The adsorption amount of the enamel frit in the electrostatic powder spraying process is 150-200 g.

14. The use according to claim 11, characterized in that The temperature of the high temperature treatment is 830-870°C; The high temperature treatment time is 8 to 12 minutes.

15. The use according to claim 11, characterized in that The thickness of the enamel coating is 150-500 μm.

16. The use according to claim 15, characterized in that The thickness of the enamel coating is 200-350 μm.

Images