Low water absorption ceramic tile with improved tile adhesion strength

Abstract

The application discloses low-water absorption ceramic tiles with improved bonding strength, which comprises a body layer and a barrier covering glaze layer, the barrier covering glaze layer is located at the bottom of the body layer, and the water absorption of the body layer is less than 0.1%; the raw materials of the barrier covering glaze layer are composed of kaolin, calcium-magnesium-sodium frit, corundum powder and cobalt blue; and the chemical composition of the barrier covering glaze layer comprises SiO2 39-44%, Al2O3 44-48%, Fe2O3 0.1-0.3%, TiO2 0.05-0.25%, CaO 1.5-2.5%, MgO 2-3.5%, K2O 0-0.6%, Na2O 3.7-4.3% and loss on ignition 0.5-2% according to the mass percentage. The scheme can effectively reduce the hollowing and falling phenomena of the existing low-water absorption ceramic tiles in the process of paving and using by adding the barrier covering glaze layer at the bottom of the body layer to improve the paving bonding strength of the ceramic tiles, so as to overcome the defects in the prior art; meanwhile, the barrier covering glaze layer also has excellent covering power and whiteness.

Description

Technical Field

[0001] This invention relates to the field of building ceramics technology, and in particular to a low-water-absorption ceramic tile that improves the bonding strength of ceramic tiles. Background Technology

[0002] In traditional tile installation, the adhesion between the cement adhesive layer and the tile decreases as the tile's water absorption rate (E value) decreases. This is primarily because low-absorption (E < 0.1%) tiles have a higher degree of sintering, resulting in a smoother, denser surface with fewer micropores and pits. This reduces the strong interlocking effect formed after the tile and cement adhesive layer hydrate.

[0003] Furthermore, large-format, low-absorption ceramic tiles have lower residual stress after high-temperature firing, making them less prone to deformation. This lower deformation means that most of the stress at the interface between the tile and the cementitious adhesive layer is concentrated in the relatively weaker adhesive layer. Simultaneously, the use of large-format tiles means fewer grout lines per unit area, reducing the space available for stress release. These factors all contribute to increased stress on the cementitious adhesive layer, making it more susceptible to damage and cracking, ultimately leading to hollow spots and detachment during tile installation and use. On one hand, hollow ceramic tiles are prone to warping or falling off during use, affecting the decorative effect; on the other hand, when hollow spots occur in water-using areas such as balconies, kitchens, and bathrooms, they can easily accumulate water and produce unpleasant odors, severely impacting the living experience.

[0004] Insufficient bonding strength between tiles and cement mortar-based adhesives is one of the causes of hollow tiles. Tile adhesive is a commonly used method to increase the strength between tiles and adhesives, but its cost is often several times that of ordinary cement mortar, resulting in higher construction costs. Furthermore, research on the bonding strength between tiles and adhesives has revealed that the water absorption rate of the tile body is a crucial factor affecting bonding strength. Increasing the water absorption rate of the tile body can effectively reduce the risk of hollow tiles. Therefore, to ensure that tiles do not slip during installation and remain dense and detached after installation, some manufacturers improve the bonding strength by increasing the water absorption rate of the tile body. However, an increased water absorption rate means a decrease in the tile's breaking strength and modulus of rupture, which can limit the application scenarios and consumer groups of the tile products. Therefore, how to improve the bonding strength of low-water-absorption tiles has become a challenge for the building ceramics industry.

[0005] Furthermore, in the semi-finished product of a ceramic tile body after high-temperature firing (i.e., the freshly fired, un-edged product), the color and whiteness of the edges and bottom are basically the same. However, in the finished product after edge grinding, the color of the edges is lighter and the whiteness is higher, resulting in a significant difference in color and whiteness compared to the bottom. This is mainly because the edges and bottom of the semi-finished product are directly heated during the firing process, so their sintering degree is basically the same, and the color and whiteness of the body are basically similar. However, after the semi-finished product is edge-ground (the grinding amount is about 15mm), the edge area receives relatively less heat during the firing process, resulting in a lower sintering degree in this area compared to the bottom. Therefore, the whiteness of the edge after grinding is higher than that of the bottom, causing the ceramic tile product to exhibit poor overall consistency. This consistency will, to some extent, affect the performance and function of the ceramic tile product, leading to differences in the performance and function of the same piece of ceramic tile, which is not conducive to meeting customer needs. Summary of the Invention

[0006] The purpose of this invention is to propose a low-water-absorption ceramic tile that improves the bonding strength of ceramic tiles. By adding an isolation and covering glaze layer at the bottom of the body layer to enhance the bonding strength of the ceramic tile, the hollowing and falling off phenomena of existing low-water-absorption ceramic tiles during installation and use can be effectively reduced, thus overcoming the shortcomings of the prior art. At the same time, the isolation and covering glaze layer also has excellent covering power and whiteness.

[0007] To achieve this objective, the present invention adopts the following technical solution:

[0008] A low-water-absorption ceramic tile for improving the bonding strength of ceramic tiles includes a body layer and an isolation and covering glaze layer, wherein the isolation and covering glaze layer is located at the bottom of the body layer, and the water absorption rate of the body layer is <0.1%.

[0009] The raw materials for the isolation and covering glaze layer are composed of kaolin, calcium magnesium sodium frit, corundum powder and cobalt blue;

[0010] Furthermore, by mass percentage, the chemical composition of the insulating and covering glaze layer includes SiO2 39-44%, Al2O3 44-48%, Fe2O3 0.1-0.3%, TiO2 0.05-0.25%, CaO 1.5-2.5%, MgO 2-3.5%, K2O 0-0.6%, Na2O 3.7-4.3%, and loss on ignition 0.5-2%.

[0011] Preferably, the D70 particle size of the corundum powder is 400-800 nm.

[0012] Preferably, the Al2O3 content in the kaolin is ≥33% by mass percentage.

[0013] Preferably, the chemical composition of the calcium-magnesium-sodium frit, by mass percentage, includes 65.38% SiO2, 16.64% Al2O3, 0.31% Fe2O3, 0.17% TiO2, 3.28% CaO, 4.64% MgO, 0.29% K2O, 6.69% Na2O, and 1.01% loss on ignition.

[0014] Preferably, the total content of CaO and MgO in the insulating glaze layer is 4.5% to 5.2% by mass percentage.

[0015] Preferably, the chemical composition of the insulating glaze layer, by mass percentage, includes 41.64% SiO2, 46.11% Al2O3, 0.21% Fe2O3, 0.1% TiO2, 1.97% CaO, 2.79% MgO, 0.2% K2O, 4.03% Na2O, and 1.25% loss on ignition.

[0016] Preferably, the raw materials of the isolation and covering glaze layer are composed of 4-6 parts kaolin, 55-65 parts calcium magnesium sodium frit, 30-40 parts corundum powder and 0.05-0.1 parts cobalt blue, by weight.

[0017] Preferably, the insulating and masking glaze layer is formed by firing an insulating and masking glaze, and the amount of the insulating and masking glaze applied is 80-120 g / m². 2 .

[0018] Preferably, the gloss of the isolation and covering glaze layer is at least 3 degrees and the whiteness is at least 17 degrees.

[0019] The technical solutions provided in this application embodiment may include the following beneficial effects:

[0020] 1. By adding an isolation and covering glaze layer at the bottom of the body layer and optimizing the formula structure of the isolation and covering glaze layer, the sintering degree of the isolation and covering glaze layer is controlled within a suitable range, thereby improving the bonding strength during installation and use.

[0021] 2. Improve the hiding power and whiteness of the isolation and covering glaze layer to enhance the integrity of the tile, ensuring consistent performance and function to meet customer needs. Simultaneously, the addition of the isolation and covering glaze layer can partially or even completely replace the existing tile base mortar, avoiding the need for nails during firing, thereby further strengthening the tile's bonding strength and improving installation efficiency. Detailed Implementation

[0022] A low-water-absorption ceramic tile for improving the bonding strength of ceramic tiles includes a body layer and an isolation and covering glaze layer, wherein the isolation and covering glaze layer is located at the bottom of the body layer, and the water absorption rate of the body layer is <0.1%.

[0023] The raw materials for the isolation and covering glaze layer are composed of kaolin, calcium magnesium sodium frit, corundum powder and cobalt blue;

[0024] Furthermore, by mass percentage, the chemical composition of the insulating and covering glaze layer includes SiO2 39-44%, Al2O3 44-48%, Fe2O3 0.1-0.3%, TiO2 0.05-0.25%, CaO 1.5-2.5%, MgO 2-3.5%, K2O 0-0.6%, Na2O 3.7-4.3%, and loss on ignition 0.5-2%.

[0025] To effectively reduce the hollowing and detachment issues that occur during the installation and use of existing low-absorption ceramic tiles, this solution proposes a low-absorption ceramic tile that improves the bonding strength. This is achieved by adding an isolation and covering glaze layer to the bottom of the tile body and optimizing the formula and structure of this glaze layer. By controlling the sintering degree of the isolation and covering glaze layer within a suitable range, the bonding strength during installation and use is improved. Simultaneously, the hiding power and whiteness of the isolation and covering glaze layer are enhanced to improve the tile's overall integrity, ensuring consistent performance and function to meet customer needs.

[0026] To enhance the hiding power of the glaze, this design incorporates a high-alumina, high-fluxing (calcium, magnesium, potassium, sodium) system into the formulation of the isolation and covering glaze. This system generates scattering substances with high refractive index within the glaze layer, thereby improving the hiding effect and simultaneously imparting a certain degree of whiteness. Specifically, after the raw materials for the isolation and covering glaze are fired, the calcium, magnesium, and sodium floc provides Mg... 2+ and Ca 2+ It will be combined with Al provided by kaolin and corundum powder 3+ The process involves the formation of magnesium aluminum spinel (MgO·Al2O3) with a refractive index of 1.72 and diopside (CaO·MgO·2SiO2) with a refractive index of 1.68. Simultaneously, the kaolin in the raw materials sequentially forms metakaolinite (Al2O3·2SiO2) and silica aluminum spinel (2Al2O3·3SiO2), ultimately forming mullite (3AlO3·2SiO2) with a refractive index of 1.64. Furthermore, the calcium magnesium sodium floc itself also crystallizes a small amount of needle-like mullite. Further, the introduction of corundum powder into the raw materials causes the eutectic glass of the entire formulation to tend to precipitate a small amount of corundum (α-Al2O3) with a refractive index of 1.76, especially when the aluminum content of the formulation system is relatively high.

[0027] Generally, the degree of sintering of the glaze layer after firing increases with the increase of alumina content in the formula system, and decreases with the increase of flux content. In the high-alumina, high-flux formula system of this scheme, the sintering degree of the insulating glaze layer after firing is conducive to achieving a suitable degree of sintering. On the one hand, it can bond well with the conventional low-water-absorption body layer before and after firing; on the other hand, it can also isolate the roller from the body layer during firing. If the sintering degree of the insulating glaze layer is too high, it will be difficult for it to form a dense ceramic tile structure with the body layer; if the sintering degree of the insulating glaze layer is too low, it will be detrimental to the isolation between the roller and the tile.

[0028] It should be noted that in the production process of modern ceramic tiles, magnesium oxide is generally used as the base slurry. After hydration, magnesium hydroxide is easily produced. This substance can easily form magnesium sulfate crystals with sulfides in the flue gas in the kiln. In the high-temperature zone, it can easily form magnesium aluminum spinel and other eutectic substances with alumina on the bottom of the brick blank and the surface of the roller. The above-mentioned eutectic substances are the "rod nails" that adhere to the roller and the bottom surface of the brick.

[0029] The presence of rods mainly occurs in two areas: the initial temperature zone (350–800℃) and the temperature range between the high-temperature zone and the rapid cooling zone. In the former, the brick blanks move through the initial temperature zone. Due to the lower firing temperature in this zone, the brick blanks haven't yet reached a liquid phase and therefore have low strength. If rods are present at this stage, the brick blanks are prone to uneven movement and breakage. In the latter, the brick blanks soften after passing through the high-temperature zone. If there are rods on the kiln rollers at this point, the flatness of the brick blanks will be affected, causing localized deformation and thus impacting the product's shape. Therefore, avoiding the presence of rods has become a challenge for the ceramics industry.

[0030] In existing technologies, the general approach is to minimize the amount or specific gravity of the brick base mortar. However, if the effective components of the brick base mortar are reduced, it becomes difficult to effectively separate the brick from the roller. Furthermore, because brick base mortar typically has a high specific gravity and is difficult to sinter, unevenly distributed residue with poor adhesion remains on the bottom of the tile after firing. During tile installation, this residue further reduces the bond strength between the tile and the cement adhesive layer, increasing the risk of tile detachment. Therefore, in actual installation, construction companies typically manually clean the brick base mortar residue before laying the tiles, which is time-consuming, labor-intensive, and detrimental to installation efficiency.

[0031] This solution optimizes the formula and structure of the isolation and covering glaze layer, ensuring it has a suitable degree of sintering. This not only improves the bonding strength of the tiles during installation but also provides a certain degree of isolation. Therefore, in the production process of low-water-absorption tiles using this solution, the addition of the isolation and covering glaze layer can partially or even completely replace the existing tile base mortar, preventing the formation of nails during firing and further enhancing the tile's bonding strength while accelerating the installation process.

[0032] To further clarify, the D70 particle size of the corundum powder is 400-800 nm.

[0033] In addition, in order to further improve the hiding power of the isolation and covering glaze, this solution also optimizes the particle size of the corundum powder used in the raw materials, so that the content of corundum powder with a particle size between 400 and 800 nm accounts for more than 70% of the total content, so as to maximize the Mie scattering phenomenon of the isolation and covering glaze and achieve the purpose of improving the hiding effect.

[0034] Specifically, in this formulation, alumina is introduced in the form of corundum (α-Al₂O₃). During high-temperature firing, some Al₂O₃ participates in the reaction and contributes to the construction of the silicate glass network, forming an aluminum-containing glass. Simultaneously, it crystallizes at a certain temperature to form high-refractive-index crystals. The remaining Al₂O₃ does not participate in the reaction and remains in the solid solution. By controlling the particle size range of alumina, the maximum scattering effect of visible light is achieved. It is necessary to prevent the particle size from being too small, which would cause light to pass directly through the small particles and produce diffraction, resulting in poor masking effect. At the same time, it is also necessary to prevent the particles from being too large, which would lead to poor dispersion of alumina in the glaze and the occurrence of non-Mi scattering.

[0035] To further clarify, the Al2O3 content in the kaolin is ≥33% by mass percentage.

[0036] Kaolin is a chemical material, and its main mineral is kaolinite. After iron removal and purification, it has extremely high whiteness and aluminum content, and is generally used to adjust glaze formulations to act as a plasticizer. In a preferred embodiment of this scheme, kaolin with an Al2O3 content ≥33% is selected as the glaze raw material, which is more conducive to isolating and covering the glaze layer to form high-coverage target crystals such as mullite (3AlO3·2SiO2) with a refractive index of 1.64.

[0037] To further clarify, the chemical composition of the calcium-magnesium-sodium frit, by mass percentage, includes 65.38% SiO2, 16.64% Al2O3, 0.31% Fe2O3, 0.17% TiO2, 3.28% CaO, 4.64% MgO, 0.29% K2O, 6.69% Na2O, and 1.01% loss on ignition.

[0038] To further clarify, the total content of CaO and MgO in the insulating and covering glaze layer is 4.5% to 5.2% by mass percentage.

[0039] Since the flux content in the formulation system has a significant impact on the formation of the sintering degree range of the glaze layer, in order to ensure that the sintering degree of the glaze layer better meets the requirements of improving the bonding strength and the isolation effect, this scheme further optimizes the total content of CaO and MgO in the isolation and covering glaze layer to be 4.5-5.2%.

[0040] To further explain, the chemical composition of the insulating and covering glaze layer, by mass percentage, includes 41.64% SiO2, 46.11% Al2O3, 0.21% Fe2O3, 0.1% TiO2, 1.97% CaO, 2.79% MgO, 0.2% K2O, 4.03% Na2O, and 1.25% loss on ignition.

[0041] To further explain, according to the mass fraction, the raw materials of the isolation and covering glaze layer consist of 4-6 parts kaolin, 55-65 parts calcium magnesium sodium frit, 30-40 parts corundum powder, and 0.05-0.1 parts cobalt blue.

[0042] In one embodiment of this technical solution, the amount of each raw material added to the isolation and covering glaze layer is optimized, which is more conducive to the generation and transformation of the target crystal.

[0043] To further clarify, the insulating and masking glaze layer is formed by firing an insulating and masking glaze, and the amount of the insulating and masking glaze applied is 80-120 g / m². 2 .

[0044] To further enhance the hiding power of the glaze, this solution also increases the thickness of the glaze by increasing the unit application amount of the isolation and covering glaze, which can achieve the goal of further improving the hiding power at a lower cost.

[0045] To further clarify, the gloss of the isolation and covering glaze layer is at least 3 degrees, and the whiteness is at least 17 degrees.

[0046] The sintering degree of the isolation and covering glaze layer formed by this solution can be characterized by its gloss, which is at least 3 degrees; and its whiteness can reach at least 17 degrees, which is close to the whiteness of the body layer after edge grinding, thereby achieving the purpose of improving the overall effect of low water absorption ceramic tiles.

[0047] The technical solution of the present invention will be further illustrated below through specific embodiments.

[0048] Example 1

[0049] A low-water-absorption ceramic tile for improving the bonding strength of ceramic tiles includes a body layer and an isolating and covering glaze layer, wherein the isolating and covering glaze layer is located at the bottom of the body layer; the body layer is prepared from conventional ceramic raw materials, with a water absorption rate of <0.1%, and its chemical composition, by mass percentage, includes SiO2 67.85%, Al2O3 17.23%, Fe2O3 1.42%, TiO2 0.23%, CaO 1.18%, MgO 1.65%, K2O 1.85%, Na2O 2.05%, and loss on ignition 4.3%; the isolating and covering glaze layer is fired from an isolating and covering glaze, and the glaze application rate of the isolating and covering glaze is 80 g / m³. 2 .

[0050] The raw materials for the isolation and covering glaze layer include kaolin with an Al2O3 content ≥33%, calcium magnesium sodium frit, corundum powder with a D70 particle size of 400-800nm, and cobalt blue. By mass percentage, the chemical composition of the isolation and covering glaze layer includes SiO2 39.03%, Al2O3 47.69%, Fe2O3 0.28%, TiO2 0.05%, CaO 1.53%, MgO 3.48%, K2O 0.6%, Na2O 3.78%, and a loss on ignition of 2%. By mass percentage, the chemical composition of the calcium magnesium sodium frit includes SiO2 65.38%, Al2O3 16.64%, Fe2O3 0.31%, TiO2 0.17%, CaO 3.28%, MgO 4.64%, K2O 0.29%, and Na2O. 6.69% and loss on ignition 1.01%.

[0051] Example 2

[0052] A low-water-absorption ceramic tile for improving the bonding strength of ceramic tiles includes a body layer and an isolating and covering glaze layer, wherein the isolating and covering glaze layer is located at the bottom of the body layer; the body layer is prepared from conventional ceramic raw materials, with a water absorption rate of <0.1%, and its chemical composition, by mass percentage, includes SiO2 67.85%, Al2O3 17.23%, Fe2O3 1.42%, TiO2 0.23%, CaO 1.18%, MgO 1.65%, K2O 1.85%, Na2O 2.05%, and loss on ignition 4.3%; the isolating and covering glaze layer is fired from an isolating and covering glaze, and the glaze application rate of the isolating and covering glaze is 100g / m³. 2 .

[0053] The raw materials for the isolation and covering glaze layer include kaolin with an Al2O3 content ≥33%, calcium magnesium sodium frit, corundum powder with a D70 particle size of 400-800nm, and cobalt blue. By mass percentage, the chemical composition of the isolation and covering glaze layer includes SiO2 41.64%, Al2O3 46.11%, Fe2O3 0.21%, TiO2 0.1%, CaO 1.97%, MgO 2.79%, K2O 0.2%, Na2O 4.03%, and loss on ignition 1.25%. By mass percentage, the chemical composition of the calcium magnesium sodium frit includes SiO2 65.38%, Al2O3 16.64%, Fe2O3 0.31%, TiO2 0.17%, CaO 3.28%, MgO 4.64%, K2O 0.29%, and Na2O. 6.69% and loss on ignition 1.01%.

[0054] Example 3

[0055] A low-water-absorption ceramic tile for improving tile bonding strength includes a body layer and an isolating and covering glaze layer, wherein the isolating and covering glaze layer is located at the bottom of the body layer; the body layer is prepared from conventional ceramic raw materials, with a water absorption rate of <0.1%, and its chemical composition, by mass percentage, includes SiO2 67.85%, Al2O3 17.23%, Fe2O3 1.42%, TiO2 0.23%, CaO 1.18%, MgO 1.65%, K2O 1.85%, Na2O 2.05%, and loss on ignition 4.3%; the isolating and covering glaze layer is fired from an isolating and covering glaze, and the glaze application rate of the isolating and covering glaze is 120 g / m³. 2 .

[0056] The raw materials for the isolation and covering glaze layer include kaolin with an Al2O3 content ≥33%, calcium magnesium sodium frit, corundum powder with a D70 particle size of 400-800nm, and cobalt blue. By mass percentage, the chemical composition of the isolation and covering glaze layer includes SiO2 43.76%, Al2O3 44.13%, Fe2O3 0.12%, TiO2 0.2%, CaO 2.43%, MgO 2.05%, K2O 0.5%, Na2O 4.28%, and loss on ignition 0.6%. By mass percentage, the chemical composition of the calcium magnesium sodium frit includes SiO2 65.38%, Al2O3 16.64%, Fe2O3 0.31%, TiO2 0.17%, CaO 3.28%, MgO 4.64%, K2O 0.29%, and Na2O. 6.69% and loss on ignition 1.01%.

[0057] Comparison Example

[0058] A low water absorption ceramic tile includes a body layer prepared from conventional ceramic raw materials, having a water absorption rate of <0.1%, and, by mass percentage, comprising SiO2 67.85%, Al2O3 17.23%, Fe2O3 1.42%, TiO2 0.23%, CaO 1.18%, MgO 1.65%, K2O 1.85%, Na2O 2.05%, and a loss on ignition of 4.3%.

[0059] The low water absorption ceramic tiles prepared in Examples 1-3 were subjected to conventional gloss and whiteness tests in the field of building ceramics technology. Meanwhile, the bond strength of the low water absorption ceramic tiles prepared in Examples 1-3 and the control example was tested. The results are shown in Table 1 below:

[0060] Table 1. Performance test results of low water absorption ceramic tiles in Examples 1-3 and the control example.

[0061]

[0062] Among them, the bonding strength test: the prepared low water absorption ceramic tile was cut into 75mm×75mm test blocks for later use. Mortar was prepared according to the ratio of standard sand: 325 cement: water = 3:2:1. The mortar was applied to the bottom of the test block and the pull-out strength was tested after 28 days.

[0063] As shown in Table 1, the gloss of the isolation and covering glaze layer obtained by the formula structure of this scheme is at least 3 degrees; and the whiteness of the glaze itself after firing can reach at least 75 degrees. After being applied to the bottom of the body layer, its whiteness is close to that of the body layer after edge grinding, ensuring the through-body effect of the low water absorption ceramic tile. At the same time, the laying effect of the low water absorption ceramic tile with the isolation and covering glaze layer of this scheme was tested, and its 28-day tensile strength reached as high as 1.046 MPa, indicating excellent bonding performance.

[0064] The technical principles of the present invention have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of the invention and should not be construed as limiting the scope of protection of the invention in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of the invention without inventive effort, and these embodiments will all fall within the scope of protection of the present invention.

Claims

1. A low-water-absorption ceramic tile that improves the bonding strength of ceramic tiles, characterized in that: It includes a body layer and an insulating and covering glaze layer, wherein the insulating and covering glaze layer is located at the bottom of the body layer, and the water absorption rate of the body layer is <0.1%; According to the mass fraction, the raw materials of the isolation and covering glaze layer include 4-6 parts of kaolin, 55-65 parts of calcium magnesium sodium frit, 30-40 parts of corundum powder and 0.05-0.1 parts of cobalt blue, and the D70 particle size of the corundum powder is 400-800 nm. Furthermore, by mass percentage, the chemical composition of the insulating and covering glaze layer includes SiO2 39-44%, Al2O3 44-48%, Fe2O3 0.1-0.3%, TiO2 0.05-0.25%, CaO 1.5-2.5%, MgO 2-3.5%, K2O 0-0.6%, Na2O 3.7-4.3%, and loss on ignition 0.5-2%.

2. The low-water-absorption ceramic tile for improving the bonding strength of ceramic tiles according to claim 1, characterized in that: The Al2O3 content in the kaolin is ≥33% by mass percentage.

3. The low-water-absorption ceramic tile for improving the bonding strength of ceramic tiles according to claim 1, characterized in that: The chemical composition of the calcium-magnesium-sodium frit, by mass percentage, includes 65.38% SiO2, 16.64% Al2O3, 0.31% Fe2O3, 0.17% TiO2, 3.28% CaO, 4.64% MgO, 0.29% K2O, 6.69% Na2O, and 1.01% loss on ignition.

4. A low-water-absorption ceramic tile for improving the bonding strength of ceramic tiles according to claim 1, characterized in that: The total content of CaO and MgO in the isolation and covering glaze layer is 4.5% to 5.2% by mass percentage.

5. A low-water-absorption ceramic tile for improving the bonding strength of ceramic tiles according to claim 4, characterized in that: The chemical composition of the insulating glaze layer, by mass percentage, includes 41.64% SiO2, 46.11% Al2O3, 0.21% Fe2O3, 0.1% TiO2, 1.97% CaO, 2.79% MgO, 0.2% K2O, 4.03% Na2O, and 1.25% loss on ignition.

6. A low-water-absorption ceramic tile for improving the bonding strength of ceramic tiles according to claim 1, characterized in that: The insulating and masking glaze layer is formed by firing an insulating and masking glaze, and the amount of the insulating and masking glaze applied is 80-120 g / m². 2 .

7. A low-water-absorption ceramic tile for improving the bonding strength of ceramic tiles according to claim 6, characterized in that: The gloss of the isolation and covering glaze layer is at least 3 degrees, and the whiteness is at least 17 degrees.

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