A hydrophilic self-cleaning antique brick and its preparation method

Abstract

The present invention discloses a method for preparing hydrophilic self-cleaning antique tiles, comprising the following steps: A. preparing a hydrophilic frit; wherein, calculated by mass percentage, the hydrophilic frit comprises the following raw materials: 8-12% lithium carbonate, 30-50% calcined talc, 4-8% zinc oxide, 25-35% aluminum oxide, 6-12% quartz, and 3-7% silicon carbide; B. preparing a hydrophilic self-cleaning glaze; wherein, calculated by mass percentage, the hydrophilic self-cleaning glaze comprises the following raw materials: 85-95% hydrophilic frit, 4-12% kaolin, and 1-3% silicon carbide; C. applying the hydrophilic self-cleaning glaze to a green body having a concave-convex effect, drying, and calcining to obtain the hydrophilic self-cleaning antique tiles. The method for preparing hydrophilic self-cleaning antique tiles proposed by the present invention is simple and easy to operate. The resulting hydrophilic self-cleaning antique tiles not only have excellent and long-lasting self-cleaning properties, but also help reduce costs.

Description

Technical Field

[0001] The invention relates to the technical field of building ceramics, in particular to a hydrophilic self-cleaning antique brick and a preparation method thereof. Background Art

[0002] Antique tiles, as an artistic building material that combines classical aesthetics with modern craftsmanship, are deeply favored by consumers for their unique antique glaze effect, rich color layers and strong historical charm. They are widely used in home decoration, commercial places, cultural and tourist attractions and other fields.

[0003] In order to ensure the antique effect of antique tiles, the surface of antique tiles is usually designed to be uneven. Although the uneven surface of antique tiles is conducive to increasing its anti-slip performance, it is also easy to become a hotbed for dirt and grime, which not only affects the beauty of antique tiles and reduces their decorative effect, but also makes the dirt treatment of antique tiles time-consuming and laborious, and requires the help of cleaning agents to effectively remove dirt.

[0004] In order to overcome the above-mentioned defects, the prior art usually coats the surface of antique bricks with a hydrophilic self-cleaning coating, so that the surface of the antique bricks forms a layer of hydrophilic self-cleaning coating, so that water can spread quickly when it contacts the coating surface (i.e., the static contact angle between water and the coating is small) and form a uniform water film. The water film can penetrate into the interface between the dirt and the coating, thereby weakening the adhesion of the dirt, and under the action of gravity, the continuously flowing water film can carry away and remove the dirt on the surface of the antique bricks, achieving a self-cleaning effect. However, due to the poor aging resistance of the hydrophilic self-cleaning coating and its limited bonding strength with the brick surface, the hydrophilic self-cleaning coating is easy to fall off, has an extremely limited service life, and has poor self-cleaning durability, which cannot meet actual use requirements. At the same time, additionally coating the surface of the antique brick substrate with a hydrophilic self-cleaning coating is not conducive to reducing production costs. Summary of the Invention

[0005] The first purpose of the present invention is to provide a preparation method of hydrophilic self-cleaning antique tiles. The preparation method is simple and easy to operate. The obtained hydrophilic self-cleaning antique tiles not only have excellent and lasting self-cleaning properties, but also help reduce costs.

[0006] The second purpose of the present invention is to provide a hydrophilic self-cleaning antique tile prepared by the above-mentioned preparation method of the hydrophilic self-cleaning antique tile, which has excellent and long-lasting self-cleaning performance.

[0007] To achieve this object, the present invention adopts the following technical solutions:

[0008] A method for preparing hydrophilic self-cleaning antique tiles comprises the following steps:

[0009] A. Prepare a hydrophilic frit; wherein, calculated by mass percentage, the hydrophilic frit comprises the following raw materials: 8-12% lithium carbonate, 30-50% calcined talc, 4-8% zinc oxide, 25-35% aluminum oxide, 6-12% quartz, and 3-7% silicon carbide;

[0010] B. Prepare a hydrophilic self-cleaning glaze; wherein, calculated by weight percentage, the hydrophilic self-cleaning glaze comprises the following raw materials: 85-95% hydrophilic frit, 4-12% kaolin, and 1-3% silicon carbide;

[0011] C. Applying a hydrophilic self-cleaning glaze to a body with a concave-convex effect, drying and calcining the body to obtain a hydrophilic self-cleaning antique tile.

[0012] Furthermore, in step A and step B, the particle size of the silicon carbide is ≤2 μm;

[0013] In step A, the particle size of the aluminum oxide is ≤2 μm.

[0014] Furthermore, in step A, the preparation step of the hydrophilic frit is specifically as follows: uniformly mixing the raw materials of the hydrophilic frit according to a ratio, calcining and then quenching with water to obtain the hydrophilic frit;

[0015] The calcination curve of the hydrophilic frit is as follows: heating from room temperature to 1530° C. at a heating rate of 8-10° C. / min, and then keeping the temperature for 35-45 minutes.

[0016] Furthermore, in step A, the hydrophilic frit comprises the following raw materials, calculated by mass percentage: 10% lithium carbonate, 40% calcined talc, 5% zinc oxide, 30% aluminum oxide, 9% quartz and 6% silicon carbide.

[0017] Furthermore, in step B, the specific gravity of the hydrophilic self-cleaning glaze is 1.25 to 1.45.

[0018] Furthermore, in step B, the residue of the hydrophilic self-cleaning glaze passing through a 325-mesh sieve is 0.2-0.4% by mass.

[0019] Furthermore, in step B, the preparation step of the hydrophilic self-cleaning glaze is: after uniformly mixing the raw materials of the hydrophilic self-cleaning glaze according to the ratio, adding sodium carboxymethyl cellulose, sodium tripolyphosphate and water for ball milling, and sieving to obtain the hydrophilic self-cleaning glaze.

[0020] Furthermore, in step C, the glazing thickness of the hydrophilic self-cleaning glaze is 0.05 to 0.1 mm.

[0021] Furthermore, in step C, the calcination temperature is 1200-1220°C.

[0022] A hydrophilic self-cleaning antique brick is prepared using the above-mentioned method for preparing the hydrophilic self-cleaning antique brick.

[0023] The technical solution provided by the present invention can have the following beneficial effects:

[0024] 1. During the calcination process, silicon carbide decomposes into silicon and carbon monoxide. Carbon monoxide will seize oxygen from the external environment, making the calcination atmosphere a reducing atmosphere. Under a reducing atmosphere, the melt produced by calcination will shrink, causing the new melt produced during the calcination process to continuously roll and float upward, which is conducive to increasing the surface tension. At the same time, the raw materials in the hydrophilic self-cleaning glaze will gradually decompose during the calcination process, causing the hydrophilic self-cleaning glaze to eventually form a glaze melt (i.e., a glaze layer) with lithium oxide, silicon oxide, aluminum oxide, magnesium oxide, and zinc oxide as the main components. Based on the reducing atmosphere and the large surface tension of each component in the glaze layer, the above two aspects cooperate with each other to make the surface tension of the glaze layer far greater than the surface tension of water, making the glaze layer essentially a hydrophilic self-cleaning glaze layer with extremely strong hydrophilic properties, so that even if dirt adheres to the surface of the glaze layer, the dirt is relatively easy to remove.

[0025] 2. Compared with the hydrophilic self-cleaning coating, the aging resistance of the hydrophilic self-cleaning glaze layer is greatly improved, which is conducive to overcoming the technical defects of the prior art that the self-cleaning timeliness is poor due to the poor aging resistance of the hydrophilic self-cleaning coating. In addition, since the hydrophilic self-cleaning glaze layer is directly formed by calcining the hydrophilic self-cleaning glaze, its bonding strength with the antique brick is extremely high, which is conducive to overcoming the technical defects of the prior art that the hydrophilic self-cleaning coating has limited bonding strength with the brick surface of the antique brick, resulting in poor self-cleaning timeliness. The mutual coordination of the above-mentioned multiple factors is conducive to achieving long-lasting self-cleaning of antique bricks, and the self-cleaning property is excellent. In addition, the present technical solution does not require additional coating of the hydrophilic self-cleaning coating on the surface of the antique brick, which is conducive to saving production costs and improving production efficiency. DETAILED DESCRIPTION

[0026] This technical solution provides a method for preparing hydrophilic self-cleaning antique tiles, comprising the following steps:

[0027] A. Prepare a hydrophilic frit; wherein, calculated by mass percentage, the hydrophilic frit comprises the following raw materials: 8-12% lithium carbonate, 30-50% calcined talc, 4-8% zinc oxide, 25-35% aluminum oxide, 6-12% quartz, and 3-7% silicon carbide;

[0028] B. Prepare a hydrophilic self-cleaning glaze; wherein, calculated by weight percentage, the hydrophilic self-cleaning glaze comprises the following raw materials: 85-95% hydrophilic frit, 4-12% kaolin, and 1-3% silicon carbide;

[0029] C. Applying a hydrophilic self-cleaning glaze to a body with a concave-convex effect, drying and calcining the body to obtain a hydrophilic self-cleaning antique tile.

[0030] Existing technology typically coats the surface of antique bricks with a hydrophilic, self-cleaning coating. This creates a layer of hydrophilic, self-cleaning coating on the surface of the antique bricks, making it easier to remove even if dirt adheres to the surface. However, due to the poor aging resistance of the hydrophilic, self-cleaning coating and its limited adhesion to the brick surface, the hydrophilic, self-cleaning coating easily falls off, resulting in an extremely limited service life and poor durability, which cannot meet actual usage requirements. Furthermore, applying a hydrophilic, self-cleaning coating to the surface of the antique bricks is not conducive to reducing production costs.

[0031] In order to achieve long-lasting self-cleaning properties while reducing costs, the present technical solution proposes a hydrophilic self-cleaning glaze, the raw materials of which include hydrophilic frit, kaolin and silicon carbide, and the raw materials of the hydrophilic frit include lithium carbonate, calcined talc, zinc oxide, aluminum oxide, quartz and silicon carbide. During the calcination process, silicon carbide decomposes into silicon element and carbon monoxide. Carbon monoxide will seize oxygen from the external environment, making the calcination atmosphere a reducing atmosphere. Under a reducing atmosphere, the melt produced by calcination will shrink, causing the new melt produced during the calcination process to continuously roll and float upward, which is conducive to increasing the surface tension. At the same time, the raw materials in the hydrophilic self-cleaning glaze will gradually decompose during the calcination process, so that the hydrophilic self-cleaning glaze will eventually form a glaze melt (i.e., a glaze layer) with lithium oxide, silicon oxide, aluminum oxide, magnesium oxide and zinc oxide as the main components; and the surface tension of lithium oxide is 450×10 -3 N / M, the surface tension of silicon oxide is 290×10 -3 N / M, the surface tension of aluminum oxide is 380×10 -3 N / M, the surface tension of magnesium oxide is 545×10 -3 N / M, the surface tension of zinc oxide is 470×10 -3 N / M, while the surface tension of water is 73×10 -3 N / m, meaning the surface tension of each element in the glaze is significantly greater than that of water. Therefore, the combination of the reducing atmosphere and the high surface tension of each component in the glaze significantly increases the surface tension of the glaze, making it a highly hydrophilic, self-cleaning glaze. Even if dirt adheres to the surface, it is easily removed.

[0032] At the same time, compared with the hydrophilic self-cleaning coating, the aging resistance of the hydrophilic self-cleaning glaze layer is greatly improved, which is conducive to overcoming the technical defects of the prior art that the self-cleaning timeliness is poor due to the poor aging resistance of the hydrophilic self-cleaning coating. In addition, since the hydrophilic self-cleaning glaze layer is directly formed by calcining the hydrophilic self-cleaning glaze, its bonding strength with the antique brick is extremely high, which is conducive to overcoming the technical defects of the prior art that the hydrophilic self-cleaning coating has limited bonding strength with the brick surface of the antique brick, resulting in poor self-cleaning timeliness. The mutual coordination of the above-mentioned multiple factors is conducive to achieving long-lasting self-cleaning of the antique brick, and the self-cleaning property is excellent. In addition, the present technical solution does not require additional coating of the hydrophilic self-cleaning coating on the surface of the antique brick, which is conducive to saving production costs and improving production efficiency.

[0033] In addition, existing common glazes generally generate solid and liquid phases during the calcination process, and the solid phase is dispersed and unevenly distributed between the liquid phases. That is, the glaze melt generated by existing glazes during the calcination process has poor dispersion uniformity. Even if the glaze itself has self-cleaning properties, the uniformity of its self-cleaning properties is poor, and good self-cleaning properties cannot be achieved. In this technical solution, under a reducing atmosphere, the melt generated by calcination will shrink, causing the new melt generated during the calcination process to continuously roll and float upward, which is conducive to homogenizing the melt obtained by calcination. That is, based on the characteristics of silicon carbide, it is conducive to homogenizing the hydrophilic frit and hydrophilic self-cleaning glaze with added silicon carbide, so that the melt obtained by calcination has extremely high uniformity. Therefore, the distribution uniformity of the various components in the glaze layer obtained by calcining the hydrophilic self-cleaning glaze obtained in this technical solution is relatively high, overcoming the technical defect in the prior art that even if the glaze itself has self-cleaning properties, the distribution uniformity of its self-cleaning properties is poor and better self-cleaning properties cannot be achieved, thereby achieving uniform and long-lasting self-cleaning properties.

[0034] Further, in step A and step B, the particle size of the silicon carbide is ≤2 μm;

[0035] In step A, the particle size of the aluminum oxide is ≤2 μm.

[0036] In a preferred embodiment of the present technical solution, by adding silicon carbide with a preferred particle size of ≤2 μm to the formula, it is beneficial to promote the decomposition of silicon carbide, so that the calcination atmosphere of the glaze is always a reducing atmosphere, thereby ensuring the self-cleaning performance of the glaze.

[0037] Furthermore, by adding aluminum oxide with a particle size of preferably ≤2 μm to the formula, it is helpful to accelerate its melting, thereby promoting the homogenization of the glaze calcination process and ensuring its performance.

[0038] Further, in step A, the preparation step of the hydrophilic frit is specifically as follows: mixing the raw materials of the hydrophilic frit evenly according to a ratio, calcining and then quenching with water to obtain the hydrophilic frit;

[0039] The calcination curve of the hydrophilic frit is as follows: heating from room temperature to 1530° C. at a heating rate of 8-10° C. / min, and then keeping the temperature for 35-45 minutes.

[0040] In a preferred embodiment of the present technical solution, by optimizing the calcination curve of the hydrophilic frit, all the raw materials in the hydrophilic frit formula can be melted, which is conducive to promoting phase separation, ensuring the performance of the hydrophilic frit, and making the hydrophilic self-cleaning glaze with the addition of the hydrophilic frit have a certain sense of transparency after calcination, thereby improving its permeability.

[0041] Further explanation, in step A, the hydrophilic frit includes the following raw materials, calculated by mass percentage: 10% lithium carbonate, 40% calcined talc, 5% zinc oxide, 30% aluminum oxide, 9% quartz and 6% silicon carbide.

[0042] In a preferred embodiment of the present technical solution, by limiting the addition amount of each raw material in the hydrophilic frit, it is beneficial to optimize the performance of the hydrophilic frit, thereby facilitating the performance of the hydrophilic self-cleaning glaze.

[0043] Further description, in step B, the specific gravity of the hydrophilic self-cleaning glaze is 1.25-1.45.

[0044] When the specific gravity of the hydrophilic self-cleaning glaze is too high, the glaze will be too thick and the fluidity will deteriorate, which will cause the application uniformity of the hydrophilic self-cleaning glaze to be poor, and defects such as glaze roads will be easily formed. In addition, the high specific gravity of the hydrophilic self-cleaning glaze will easily hinder the discharge of gases and water generated by the hydrophilic self-cleaning glaze during the calcination process, causing the glaze layer obtained by calcining the hydrophilic self-cleaning glaze to crack easily. When the specific gravity of the hydrophilic self-cleaning glaze is too low, the fluidity of the hydrophilic self-cleaning glaze is too good, and it is easy to flow during the glazing process, which will also cause the application uniformity of the hydrophilic self-cleaning glaze to be poor, and defects such as glaze roads will be easily formed. In addition, the specific gravity of the hydrophilic self-cleaning glaze is too low, resulting in too much water in the glaze, and phenomena such as brick blasting will easily occur during the calcination process. It should be noted that glaze road refers to the glaze layer being thicker in some areas and thinner or missing in other areas.

[0045] Further, in step B, the residue of the hydrophilic self-cleaning glaze passing through a 325-mesh sieve is 0.2-0.4% by mass.

[0046] In a preferred embodiment of the present technical solution, by limiting the fineness of the hydrophilic self-cleaning glaze, the sieve residue of the hydrophilic self-cleaning glaze is relatively low, which is beneficial for making the hydrophilic self-cleaning glaze have fine uniformity, reducing the rough glaze surface caused by uneven particles, and improving the self-cleaning performance.

[0047] Further, in step B, the preparation step of the hydrophilic self-cleaning glaze is: after uniformly mixing the raw materials of the hydrophilic self-cleaning glaze according to the ratio, adding sodium carboxymethyl cellulose, sodium tripolyphosphate and water for ball milling, and sieving to obtain the hydrophilic self-cleaning glaze.

[0048] The present technical solution also proposes a preparation method for a hydrophilic self-cleaning glaze, which is simple and easy to operate. Specifically, calculated based on the mass percentage of the dry material of the hydrophilic self-cleaning glaze, the amount of sodium carboxymethyl cellulose added is 0.2%, the amount of sodium tripolyphosphate added is 0.3%, and the amount of water added is 35-38%. After the above additives are added to the mixed material, the mixture is ball-milled for 12 hours and then sieved to obtain the hydrophilic self-cleaning glaze.

[0049] Further description, in step C, the glazing thickness of the hydrophilic self-cleaning glaze is 0.05 to 0.1 mm.

[0050] When the glaze is applied too thick, it is easy to affect the homogenization of the glaze, which in turn leads to a decrease in the self-cleaning performance of the glaze layer after calcination. When the glaze is applied too thin, it may leak through the body, which also leads to a decrease in the self-cleaning performance of the glaze layer after calcination.

[0051] Further description, in step C, the calcination temperature is 1200-1220°C.

[0052] In a preferred embodiment of the present technical solution, by limiting the glaze firing temperature to 1200-1220°C, which is consistent with the firing temperature of existing antique tile products, while ensuring product performance, it is also easy to achieve the purpose of industrial production and reduce large deviations between the experimental stage and the industrialization stage.

[0053] A hydrophilic self-cleaning antique brick is prepared using the above-mentioned method for preparing the hydrophilic self-cleaning antique brick.

[0054] A hydrophilic self-cleaning antique tile prepared by the method for preparing the hydrophilic self-cleaning antique tile has excellent and long-lasting self-cleaning performance.

[0055] The technical solution of the present invention is further illustrated below through specific implementation methods.

[0056] Performance Testing

[0057] Static contact angle before immersion: According to the test method of "GB / T 30447-2013 Measurement method of contact angle of nanofilm", the static contact angle of hydrophilic self-cleaning antique tiles without soaking in boiling water is tested. If the static contact angle is <10°, it is qualified.

[0058] Static contact angle after immersion: According to the test method of "GB / T 30447-2013 Measurement method of contact angle of nanofilm", the static contact angle of hydrophilic self-cleaning antique tiles after immersion in boiling water for 30 days is tested. If the contact angle is less than 25°, it is qualified.

[0059] Anti-slip performance: Anti-slip performance is tested according to the DIN 51130:2014 anti-slip standard.

[0060] Mohs hardness: The Mohs hardness of the hydrophilic self-cleaning antique tiles was tested using a Mohs hardness tester.

[0061] Example 1

[0062] A. 10% lithium carbonate, 40% calcined talc, 5% zinc oxide, 30% aluminum oxide with a particle size of 1.5 μm, 9% quartz, and 6% silicon carbide with a particle size of 1.5 μm were uniformly mixed, calcined, and then water-quenched to obtain a hydrophilic frit; wherein the calcination curve of the hydrophilic frit was as follows: heating from room temperature at a heating rate of 8-10°C / min to 1530°C, and holding the temperature for 35 minutes;

[0063] B. Calculated by mass percentage, 90% of a hydrophilic frit, 8% of kaolin, and 2% of silicon carbide having a particle size of 1.5 μm were uniformly mixed, and then sodium carboxymethyl cellulose, sodium tripolyphosphate, and water were added for ball milling. The mixture was sieved to obtain a hydrophilic self-cleaning glaze having a specific gravity of 1.35; wherein, by mass percentage, the sieve residue of the hydrophilic self-cleaning glaze after passing through a 325-mesh sieve was 0.3%; calculated by mass percentage of the dry material of the hydrophilic self-cleaning glaze, the amount of sodium carboxymethyl cellulose added was 0.2%, the amount of sodium tripolyphosphate added was 0.3%, and the amount of water added was 38%;

[0064] C. Applying a hydrophilic self-cleaning glaze to a body with a concave-convex effect, drying and calcining at a temperature of 1200-1220° C. to obtain a hydrophilic self-cleaning antique tile; wherein the glazing thickness of the hydrophilic self-cleaning glaze is 0.08 mm.

[0065] Example 2

[0066] A. 8% lithium carbonate, 32% calcined talc, 6% zinc oxide, 35% aluminum oxide with a particle size of 1.5 μm, 12% quartz, and 7% silicon carbide with a particle size of 1.5 μm were uniformly mixed, calcined, and then water-quenched to obtain a hydrophilic frit; wherein the calcination curve of the hydrophilic frit was as follows: heating from room temperature at a heating rate of 8-10°C / min to 1530°C, and holding for 45 minutes;

[0067] B. Calculated by mass percentage, 85% of a hydrophilic frit, 12% of kaolin, and 3% of silicon carbide having a particle size of 1.5 μm were uniformly mixed, and then sodium carboxymethyl cellulose, sodium tripolyphosphate, and water were added for ball milling. The mixture was sieved to obtain a hydrophilic self-cleaning glaze having a specific gravity of 1.25; wherein, by mass percentage, the residue of the hydrophilic self-cleaning glaze passing through a 325-mesh sieve was 0.2%; calculated by mass percentage of the dry material of the hydrophilic self-cleaning glaze, the amount of sodium carboxymethyl cellulose added was 0.2%, the amount of sodium tripolyphosphate added was 0.3%, and the amount of water added was 35%;

[0068] C. Applying a hydrophilic self-cleaning glaze to a body with a concave-convex effect, drying and calcining at a temperature of 1200-1220° C. to obtain a hydrophilic self-cleaning antique tile; wherein the glazing thickness of the hydrophilic self-cleaning glaze is 0.05 mm.

[0069] Example 3

[0070] A. 12% lithium carbonate, 50% calcined talc, 4% zinc oxide, 25% aluminum oxide with a particle size of 1.5 μm, 6% quartz, and 3% silicon carbide with a particle size of 1.5 μm were uniformly mixed, calcined, and then water-quenched to obtain a hydrophilic frit; wherein the calcination curve of the hydrophilic frit was as follows: heating from room temperature at a heating rate of 8-10°C / min to 1530°C, and holding the temperature for 40 minutes;

[0071] B. Calculated by mass percentage, 93% of a hydrophilic frit, 6% of kaolin, and 1% of silicon carbide having a particle size of 1.5 μm were uniformly mixed, and then sodium carboxymethyl cellulose, sodium tripolyphosphate, and water were added for ball milling. The mixture was sieved to obtain a hydrophilic self-cleaning glaze having a specific gravity of 1.45; wherein, by mass percentage, the hydrophilic self-cleaning glaze had a sieve residue of 0.4% after passing through a 325-mesh sieve; and calculated by mass percentage of the dry material of the hydrophilic self-cleaning glaze, the amount of sodium carboxymethyl cellulose added was 0.2%, the amount of sodium tripolyphosphate added was 0.3%, and the amount of water added was 37%;

[0072] C. Applying a hydrophilic self-cleaning glaze to a body with a concave-convex effect, drying and calcining at a temperature of 1200-1220° C. to obtain a hydrophilic self-cleaning antique tile; wherein the glazing thickness of the hydrophilic self-cleaning glaze is 0.1 mm.

[0073] Comparative Example 1

[0074] The hydrophilic self-cleaning antique brick in Comparative Example 1 includes an antique brick substrate and a hydrophilic self-cleaning coating distributed from bottom to top; the hydrophilic self-cleaning coating is obtained by curing a super hydrophilic coating model SM-TM-QS3500 / 3200 produced by Shangmeng Technology Wuxi Co., Ltd.

[0075] Comparative Example 2

[0076] Comparative Example 2 was prepared using the same method and raw materials as Example 1, except that silicon carbide was not added to the hydrophilic frit formulation in Comparative Example 2. Specifically, in Comparative Example 2, the hydrophilic frit comprised the following raw materials, calculated by weight: 12% lithium carbonate, 40% calcined talc, 5% zinc oxide, 32% aluminum oxide, and 11% quartz.

[0077] Comparative Example 3

[0078] Comparative Example 3 was prepared using the same method and raw materials as Example 1, except that silicon carbide was not added to the hydrophilic self-cleaning glaze in Comparative Example 3. Specifically, in Comparative Example 3, the hydrophilic self-cleaning glaze comprised the following raw materials, calculated by mass percentage: 95% hydrophilic frit and 5% kaolin.

[0079] The performance tests of the hydrophilic self-cleaning antique tiles prepared by the preparation methods of Examples 1-3 and Comparative Examples 1-3 were performed, and the results are shown in Table 1 below:

[0080] Table 1 Performance test results of different hydrophilic self-cleaning antique tiles in Examples and Comparative Examples

[0081]

[0082] It can be seen from the performance test results in Table 1 that the static contact angle of the antique tiles obtained by the present technical solution before immersion is 5-10°, and the static contact angle after immersion is 9-17°. It not only has excellent and long-lasting self-cleaning performance, but also has good anti-slip properties and hardness, combining decorativeness and practicality, and is more conducive to meeting the use needs of consumers.

[0083] In Comparative Example 1, a hydrophilic self-cleaning coating is provided on the surface of the antique brick substrate to obtain a hydrophilic self-cleaning antique brick. Although the obtained antique brick has a small static contact angle with water before immersion and has good self-cleaning properties, it is affected by the poor aging resistance of the hydrophilic self-cleaning coating and its limited bonding strength with the brick surface. As a result, after immersion, the hydrophilic self-cleaning coating of the hydrophilic self-cleaning antique brick in Comparative Example 1 falls off, the hydrophilic self-cleaning durability is poor, and the static contact angle after immersion cannot be measured.

[0084] Since silicon carbide was not added to the hydrophilic frit formula in Comparative Example 2 and silicon carbide was not added to the hydrophilic self-cleaning glaze formula in Comparative Example 3, the self-cleaning property of the obtained antique tiles was reduced.

[0085] The technical principles of the present invention have been described above with reference to specific embodiments. These descriptions are intended solely to illustrate the principles of the present invention and are not to be construed in any way as limiting the scope of protection of the present invention. Based on the explanations herein, those skilled in the art will readily conceive of other specific embodiments of the present invention without inventive effort, and such embodiments will fall within the scope of protection of the present invention.

Claims

1. A method for preparing hydrophilic self-cleaning antique tiles, characterized in that: The following steps are involved: A. Prepare a hydrophilic frit; wherein, calculated by mass percentage, the hydrophilic frit comprises the following raw materials: 8-12% lithium carbonate, 30-50% calcined talc, 4-8% zinc oxide, 25-35% aluminum oxide, 6-12% quartz, and 3-7% silicon carbide; B. Prepare a hydrophilic self-cleaning glaze; wherein, calculated by weight percentage, the hydrophilic self-cleaning glaze comprises the following raw materials: 85-95% hydrophilic frit, 4-12% kaolin, and 1-3% silicon carbide; C. Applying a hydrophilic self-cleaning glaze to a body with a concave-convex effect, drying and calcining the body to obtain a hydrophilic self-cleaning antique tile.

2. The method for preparing a hydrophilic self-cleaning antique tile according to claim 1, characterized in that: In step A and step B, the particle size of the silicon carbide is ≤2 μm; In step A, the particle size of the aluminum oxide is ≤2 μm.

3. The method for preparing a hydrophilic self-cleaning antique tile according to claim 1, characterized in that: In step A, the preparation step of the hydrophilic frit is specifically as follows: mixing the raw materials of the hydrophilic frit evenly according to a ratio, calcining and then quenching with water to obtain the hydrophilic frit; The calcination curve of the hydrophilic frit is as follows: heating from room temperature to 1530° C. at a heating rate of 8-10° C. / min, and then keeping the temperature for 35-45 minutes.

4. The method for preparing a hydrophilic self-cleaning antique tile according to claim 1, characterized in that: In step A, the hydrophilic frit includes the following raw materials calculated by mass percentage: 10% lithium carbonate, 40% calcined talc, 5% zinc oxide, 30% aluminum oxide, 9% quartz and 6% silicon carbide.

5. The method for preparing a hydrophilic self-cleaning antique tile according to claim 1, characterized in that: In step B, the specific gravity of the hydrophilic self-cleaning glaze is 1.25 to 1.

45.

6. The method for preparing a hydrophilic self-cleaning antique tile according to claim 1, characterized in that: In step B, the hydrophilic self-cleaning glaze has a sieve residue of 0.2-0.4% by mass after passing through a 325-mesh sieve.

7. The method for preparing a hydrophilic self-cleaning antique tile according to claim 1, characterized in that: In step B, the preparation steps of the hydrophilic self-cleaning glaze are as follows: after uniformly mixing the raw materials of the hydrophilic self-cleaning glaze according to the ratio, adding sodium carboxymethyl cellulose, sodium tripolyphosphate and water, ball milling, and sieving to obtain the hydrophilic self-cleaning glaze.

8. The method for preparing a hydrophilic self-cleaning antique tile according to claim 1, characterized in that: In step C, the glazing thickness of the hydrophilic self-cleaning glaze is 0.05 to 0.1 mm.

9. The method for preparing a hydrophilic self-cleaning antique tile according to claim 1, characterized in that: In step C, the calcination temperature is 1200-1220°C.

10. A hydrophilic self-cleaning antique tile, characterized by: The hydrophilic self-cleaning antique brick is prepared using the preparation method of any one of claims 1 to 9.

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