A method for modifying the back surface of a ceramic tile and a ceramic tile obtained by using the same

Abstract

The present invention provides a method for modifying the back bottom surface of a ceramic tile and a ceramic tile obtained by using the same, belonging to the field of ceramic technology. Before applying the brick bottom slurry to the green body back bottom of the ceramic tile, the present invention first coats a hydrophobic modifier on the protruding areas of the bottom pattern. During the subsequent application of the brick bottom slurry, due to the hydrophobic effect, the protruding areas in contact with the brick bottom slurry cannot rapidly absorb water, enabling the brick bottom slurry to spread to the concave areas of the bottom pattern, improving the overall roughness of the brick bottom surface, and thus enhancing the bonding strength of the ceramic tile. At the same time, after polishing the anti-fouling wax on the surface of the ceramic tile, by coating a hydrophilic modifier on the bottom of the ceramic tile, the hydrophobic phenomenon of the brick bottom caused by the deposition of wax B is inhibited, increasing the affinity between the bottom of the ceramic tile and the adhesive during paving, and further enhancing the bonding strength.

Description

Technical Field

[0001] The present application relates to the technical field of ceramics, and particularly relates to a modification method for the back surface of a ceramic tile and a ceramic tile prepared by using the same. Background Art

[0002] Ceramic tiles are a kind of building materials used for building decoration and structural purposes. It has excellent weather resistance, wear resistance, fire resistance and decorative properties, and is widely used in fields such as building exterior walls, floors, indoor and outdoor decoration, etc. During the actual paving and use of ceramic tiles, the problem of empty falling of the paste often occurs, which not only affects the service life and decorative effect, but also is a very serious potential safety hazard. From the perspective of material mechanics, the detachment of ceramic tiles from the base surface is caused by the internal stress of the ceramic tile - adhesive - substrate system. When the interfacial shear force caused by relative deformation such as shrinkage deformation, temperature change, and wet expansion exceeds the shear bond strength of the ceramic tile - adhesive, the ceramic tile first shows hollowing at the four corners. When the hollowing gradually develops to the entire interface, the ceramic tile will fall off.

[0003] During the production process of ceramic tiles, in order to protect the roller rods and prevent the green bricks from softening and sticking to the roller rods in the high-temperature area of the kiln, a brick bottom slurry, generally a mixture of alumina and magnesia, will be applied to the bottom of the green ceramic tiles before entering the kiln. After the bricks are fired, a certain amount of alumina and magnesia powder will remain and form brick bottom powder. During the high-temperature sintering process of ceramic tiles, a liquid phase is generated to wrap the alumina and magnesia powder particles at the brick bottom, forming an integral body. The powder particles wrapped at the brick bottom increase the roughness of the brick bottom, thereby generating a better mechanical bonding force with the tile adhesive and improving the bonding strength of the ceramic tile. However, the green bricks are particularly hygroscopic, and the water in the brick bottom slurry will be quickly absorbed by the green body. There are concave and convex patterns on the back of the green body at the bottom. Usually, the brick bottom slurry is only applied to the convex areas that can be contacted by the rubber roller, and there is no brick bottom slurry in the concave areas, which results in a lower roughness in the concave areas and relatively weak adhesion to the adhesive during paving.

[0004] In addition, ceramic tiles are usually processed as follows after firing: polishing, applying wax A (brightening), applying wax B (stain prevention), edge grinding, film pasting, and packing and warehousing. After a period of storage, the "bead effect" (that is, obvious hydrophobic phenomenon appears on the brick bottom) will occur on the brick bottom of the ceramic tiles processed as above. The "bead effect" will lead to a lack of wettability between the brick bottom and the water-based adhesive, and the bonding force with the adhesive is weak after drying, resulting in the risk of ceramic tile hollowing and falling off. Through actual test analysis, it is found that the reason for the "bead effect" is that wax B (the main component is hydrophobic silicone oil) diffuses or volatilizes and deposits on the bottom of the ceramic tile through the protective film, which is equivalent to depositing a layer of hydrophobic organosilicon molecules on the bottom surface of the ceramic tile, making the back of the ceramic tile show a hydrophobic phenomenon, thus generating the so-called "bead effect". Before paving the ceramic tiles, it is usually necessary to remove this hydrophobic film by physical means, such as grinding or roughing treatment, which increases the construction cost. Summary of the Invention

[0005] Based on the defects existing in the prior art, the purpose of the present application is to provide a method for modifying the back surface of a ceramic tile and a ceramic tile prepared by using the same, so as to improve the bonding strength of the ceramic tile.

[0006] To achieve the above purpose, in the first aspect, the present application provides a method for modifying the back surface of a ceramic tile, including the following steps: applying a hydrophobic modifier first and then a tile bottom slurry to the convex areas of the bottom pattern of the green ceramic tile blank, firing, polishing and waxing, edging, then applying a hydrophilic modifier to the tile bottom, and drying to obtain the ceramic tile;

[0007] Wherein, the hydrophobic modifier includes the following components in mass percentage: methyl silicate 1.8% - 5.2%, alumina 5% - 15%, suspending agent 5% - 10%, water 69.8% - 88.2%;

[0008] The hydrophilic modifier includes the following components in mass percentage: hydrophilic agent 1% - 7%, water-based resin 0 - 7%, wetting agent 0.2% - 3%, water 83% - 98.8%.

[0009] The inventors found in the research process that during the production of ceramic tiles, before applying the tile bottom slurry, applying the above-mentioned specific hydrophobic modifier to the convex areas of the bottom pattern of the green ceramic tile blank first, during the subsequent application of the tile bottom slurry, due to the hydrophobic effect, the convex areas in contact with the tile bottom slurry cannot quickly absorb water, and the tile bottom slurry can spread to the concave areas of the bottom pattern, improving the overall roughness of the tile bottom, thereby enhancing the bonding strength of the ceramic tile; at the same time, after polishing the anti-fouling wax on the surface of the ceramic tile, by applying the above-mentioned specific hydrophilic modifier to the bottom of the ceramic tile, the hydrophobic phenomenon of the tile bottom caused by the deposition of B wax can be inhibited, increasing the affinity between the bottom of the ceramic tile and the adhesive during paving, and further improving the bonding strength.

[0010] In the hydrophobic modifier, methyl silicate is a water-based waterproofing agent material. Under the action of water and carbon dioxide, it generates methyl silicate alcohol, which further combines and reacts with building materials to form an insoluble waterproof polymer compound several molecules thick on the surface and inside of the structural material. The content of methyl silicate in the hydrophobic modifier affects the diffusion of the brick bottom slurry. When the content is too low, the brick bottom slurry cannot effectively diffuse into the concave area; when the content is too high, due to the too strong hydrophobic effect, there is not enough brick bottom slurry in the convex area, which makes the green body and the roller stick easily during the firing process, and also makes the bonding strength of the ceramic tile relatively low. Therefore, it is necessary to control the content of methyl silicate in the hydrophobic modifier within the above specific range. The positive ions (such as sodium, potassium, lithium ions, etc.) contained in methyl silicate are flux components, which will cause the temperature of the green body in contact with it during the firing process to decrease, and make the brick blank soften in the medium and high temperature zones of the kiln, increasing the risk of sticking to the roller. By adding alumina, the problem of the decrease in the temperature of the green body caused by the use of the hydrophobic modifier can be avoided, and the brick blank can be prevented from softening in the medium and high temperature zones of the kiln and sticking to the roller. At the same time, considering the cost factor, the content of alumina is controlled within the above appropriate range.

[0011] In the hydrophilic modifier, the hydrophilic agent can reduce the surface tension of the brick bottom, making the brick bottom more easily adsorbed and wetted when contacting water; the wetting agent can ensure that the hydrophilic modifier can diffuse on the brick bottom and ensure the uniformity of the coating of the hydrophilic modifier on the brick bottom.

[0012] When the hydrophobic modifier is used, it is applied to the convex area of the green body before the brick bottom slurry, and the coating method can be selected as roll coating, etc.; when the hydrophilic modifier is used, it is applied to the brick bottom after waxing (including B wax).

[0013] The mass percentage of methyl silicate in the hydrophobic modifier is 1.8% - 5.2%, such as 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5% or any range formed by any two of the above values.

[0014] The mass percentage of alumina in the hydrophobic modifier is 5% - 15%, such as 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15% or any range formed by any two of the above values.

[0015] The mass percentage of the suspending agent in the hydrophobic modifier is 5% - 10%, such as 5%, 6%, 7%, 8%, 9%, 10% or any range formed by any two of the above values.

[0016] The mass percentage of water in the hydrophobic modifier is 69.8% - 88.2%, such as 70%, 72%, 74%, 76%, 78%, 80%, 82%, 84%, 86%, 88% or any range formed by any two of the above values.

[0017] The mass percentage of the hydrophilic agent in the hydrophilic modifier is 1% - 7%, such as 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 6%, 7% or the range formed by any two of the above values.

[0018] The mass percentage of the waterborne resin in the hydrophilic modifier is 0 - 7%, such as 0, 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 6%, 7% or the range formed by any two of the above values. Adding the waterborne resin to the hydrophilic modifier can form a film after the water evaporates, further ensuring the persistence of the hydrophilic agent.

[0019] The mass percentage of the wetting agent in the hydrophilic modifier is 0.2% - 3%, such as 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 2%, 3% or the range formed by any two of the above values.

[0020] The mass percentage of water in the hydrophilic modifier is 83% - 98.8%, such as 83%, 86%, 88%, 90%, 92%, 94%, 96%, 98.8% or the range formed by any two of the above values.

[0021] Preferably, the hydrophilic modifier comprises the following components in mass percentages: 1% - 5% of the hydrophilic agent, 0 - 5% of the waterborne resin, 0.2% - 1% of the wetting agent, and 89% - 98.8% of water, so that the hydrophilic modifier is easier to dry, while reducing costs and facilitating industrial production.

[0022] Preferably, the methyl silicate comprises at least one of sodium methyl silicate, potassium methyl silicate, and lithium methyl silicate.

[0023] The suspending agent can be a conventional suspending agent in the art, for example, at least one selected from kaolin, sodium carboxymethyl cellulose, etc.

[0024] Preferably, the hydrophilic agent comprises at least one of alkylphenol polyoxyethylene ether, sodium polycarboxylate, and sodium dioctyl sulfosuccinate.

[0025] Preferably, the waterborne resin comprises at least one of waterborne polyurethane resin, waterborne acrylic resin, waterborne alkyd resin, waterborne polyester resin, and waterborne epoxy resin.

[0026] Preferably, the wetting agent comprises at least one of silicone-modified acrylate and polyether-modified polysiloxane.

[0027] The hydrophobic modifier may further contain high-temperature materials, such as at least one of kaolin, ball clay, etc.; it may also contain magnesium oxide.

[0028] The hydrophilic modifier may further contain ethanol to improve the drying rate of the hydrophilic modifier.

[0029] Preferably, when applying the hydrophobic modifier to the convex area at the bottom of the green body, a rubber roller coating method is used.

[0030] Preferably, when applying the hydrophilic modifier to the brick bottom, a rubber roller coating or spraying method is used.

[0031] Preferably, the preparation method of the hydrophobic modifier includes the following steps: mixing alumina, a suspending agent and water in proportion, grinding until the particle size D50 of the alumina is less than 10 μm, and then adding methyl silicate and dispersing to obtain the hydrophobic modifier. Among them, the particle size D50 of the alumina is less than 10 μm, such as 9 μm, 7 μm, 5 μm, etc., so that the hydrophobic modifier has good stability and is not prone to sedimentation during storage and use. The particle size D50 of the alumina is measured by a laser particle size analyzer and is the particle size value when the cumulative distribution percentage reaches 50%.

[0032] In the process of preparing the hydrophobic modifier, there are no other limitations on the grinding process and equipment. For example, the grinding method can be ball milling, the ball milling temperature can be room temperature, the rotation speed of the ball milling can be 500 - 700 r / min, the ball milling time can be 10 - 30 min, and the ball milling equipment can be a planetary ball mill.

[0033] In the process of preparing the hydrophobic modifier, the dispersion after adding methyl silicate can be carried out by stirring or other methods, and the dispersion temperature can be room temperature.

[0034] Preferably, the preparation method of the hydrophilic modifier includes the following steps: mixing and dispersing all raw materials to obtain the hydrophilic modifier.

[0035] In the process of preparing the hydrophilic modifier, the dispersion can be carried out by stirring or other methods, and the dispersion temperature can be room temperature.

[0036] The brick bottom slurry can be at least one of alumina slurry and magnesium oxide slurry. This application has no limitation on the formula of the alumina slurry and the magnesium oxide slurry, and the commonly used alumina slurry and / or magnesium oxide slurry in the art can be selected.

[0037] For the drying after applying the hydrophilic modifier to the brick bottom, the drying method can be air drying or infrared drying.

[0038] In the second aspect, this application provides a ceramic tile prepared by using the modification method.

[0039] Compared with the prior art, the beneficial effects of the present application are as follows: Before applying the brick bottom slurry to the back bottom of the green ceramic tile blank, a hydrophobic modifier is first applied to the convex area of the bottom pattern. When the brick bottom slurry is subsequently applied, due to the hydrophobic effect, the convex area in contact with the brick bottom slurry cannot quickly absorb water, enabling the brick bottom slurry to spread to the concave area of the bottom pattern, improving the overall roughness of the brick bottom surface, and thus enhancing the bonding strength of the ceramic tile. At the same time, after polishing and applying anti-fouling wax to the surface of the ceramic tile, a hydrophilic modifier is applied to the bottom of the ceramic tile to inhibit the hydrophobic phenomenon of the brick bottom caused by the deposition of wax B, increasing the affinity between the bottom of the ceramic tile and the adhesive during paving, and further improving the bonding strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a test photo of the "bead effect" for Comparative Example 1;

[0041] Figure 2 It is a test photo of the "bead effect" for Example 1. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0042] In order to better illustrate the purpose, technical solutions and advantages of the present application, the present application will be further described below in conjunction with specific embodiments and comparative examples. The purpose is to understand the content of the present application in detail, rather than to limit the present application. All other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present application. The experimental reagents and instruments involved in the implementation of the present application are all common ordinary reagents and instruments unless otherwise specified. In the present application, among the technically characterized descriptions in an open-ended manner, there are included closed technical solutions composed of the listed characteristics, as well as open technical solutions including the listed characteristics.

[0043] Example 1

[0044] This example provides a method for modifying the back bottom surface of a ceramic tile, including the following steps:

[0045] Grind the powder, press and form, dry, inkjet glaze, obtain the green ceramic tile blank. Use the method of applying with a rubber roller to first apply a hydrophobic modifier to the convex area of the bottom pattern of the green ceramic tile blank and then apply the brick bottom slurry, fire, polish and wax, grind the edges, use the method of applying with a rubber roller to apply a hydrophilic modifier to the convex area of the brick bottom, dry, and package to obtain the ceramic tile;

[0046] Among them, the hydrophobic modifier includes the following components in mass percentage: potassium methyl silicate 2%, alumina 6%, suspending agent (sodium carboxymethyl cellulose solution, the mass percentage of sodium carboxymethyl cellulose is 2%) 8%, and water 84%;

[0047] The brick bottom slurry is a magnesia brick bottom slurry, including the following components in mass percentage: magnesia 86%, black mud 4.5%, and washed ball clay 9.5%;

[0048] The preparation method of the hydrophobic modifier comprises the following steps: mixing alumina, a suspending agent and water in proportion, ball milling until the particle size D50 of the alumina is less than 10 μm, and then adding methyl silicate and stirring to obtain the hydrophobic modifier;

[0049] The hydrophilic modifier comprises the following components in mass percentage: alkylphenol polyoxyethylene ether (PE 100, Cognis) 3%, waterborne acrylic resin (E0511-x, Yoshida) 2%, silicone-modified acrylate (BYK-3550, BYK) 0.2%, water 94.8%; the preparation method of the hydrophilic modifier comprises the following steps: mixing all the raw materials and stirring to obtain the hydrophilic modifier.

[0050] Example 2

[0051] The difference between this example and Example 1 lies in:

[0052] (a) The hydrophobic modifier comprises the following components in mass percentage: sodium methyl silicate 5%, alumina 15%, suspending agent (sodium carboxymethyl cellulose solution, mass percentage of sodium carboxymethyl cellulose is 2%) 10%, water 70%;

[0053] (b) The hydrophilic modifier comprises the following components in mass percentage: sodium dioctyl sulfosuccinate (OT 75, Zhongya) 5%, polyether-modified polysiloxane (AKN-1045, Qianyou) 0.5%, water 94.5%;

[0054] (c) The hydrophilic modifier is coated on both the convex area and the concave area, and the coating method of the hydrophilic modifier is spraying.

[0055] Example 3

[0056] The difference between this example and Example 1 lies in:

[0057] (a) The hydrophobic modifier comprises the following components in mass percentage: potassium methyl silicate 3%, alumina 8%, suspending agent (sodium carboxymethyl cellulose solution, mass percentage of sodium carboxymethyl cellulose is 2%) 5%, water 84%;

[0058] (b) The hydrophilic modifier comprises the following components in mass percentage: sodium polycarboxylate (SN 5040, Zhongya) 1%, waterborne polyurethane resin (F0401, Yoshida) 5%, silicone-modified acrylate (BYK-3550, BYK) 1%, water 93%.

[0059] Example 4

[0060] The difference between this embodiment and Embodiment 1 lies in that the hydrophobic modifier comprises the following components by mass percentage: lithium methyl silicate 2%, alumina 5%, suspending agent (sodium carboxymethyl cellulose solution with a mass percentage of sodium carboxymethyl cellulose of 2%) 5%, and water 88%.

[0061] Example 5

[0062] The difference between this embodiment and Embodiment 1 lies in that the hydrophilic modifier comprises the following components by mass percentage: alkylphenol polyoxyethylene ether (PE 100, Cognis) 6%, waterborne acrylic resin (E0511-x, Yoshida) 6%, silicone-modified acrylate (BYK-3550, BYK) 2%, and water 86%.

[0063] Comparative Example 1

[0064] The difference between this comparative example and Embodiment 1 lies in that no hydrophobic modifier and hydrophilic modifier are coated.

[0065] Comparative Example 2

[0066] The difference between this comparative example and Embodiment 1 lies in that only the hydrophobic modifier is coated and the hydrophilic modifier is not coated.

[0067] Comparative Example 3

[0068] The difference between this comparative example and Embodiment 1 lies in that the hydrophobic modifier comprises the following components by mass percentage: potassium methyl silicate 6%, alumina 20%, suspending agent (sodium carboxymethyl cellulose solution with a mass percentage of sodium carboxymethyl cellulose of 2%) 12%, and water 62%.

[0069] Comparative Example 4

[0070] The difference between this comparative example and Embodiment 1 lies in that only the hydrophilic modifier is coated and the hydrophobic modifier is not coated.

[0071] Comparative Example 5

[0072] The difference between this comparative example and Embodiment 1 lies in that the hydrophobic modifier comprises the following components by mass percentage: alumina 6%, suspending agent (sodium carboxymethyl cellulose solution with a mass percentage of sodium carboxymethyl cellulose of 2%) 8%, and water 86%.

[0073] Comparative Example 6

[0074] The difference between this comparative example and Embodiment 1 lies in that the hydrophilic modifier comprises the following components by mass percentage: waterborne acrylic resin (E0511-x, Yoshida) 2%, silicone-modified acrylate (BYK-3550, BYK) 0.2%, and water 97.8%.

[0075] Comparative Example 7

[0076] The difference between this comparative example and Example 1 lies in that the hydrophilic modifier comprises components in the following mass percentages: alkylphenol polyoxyethylene ether (PE100, Cognis) 3%, waterborne acrylic resin (E0511-x, Yoshida) 2%, and water 95%.

[0077] The following performance tests were carried out on the ceramic tiles obtained from the above examples and comparative examples:

[0078] (1) Bond strength test: Referring to T∕CBCSA 33-2020 "Determination method for bond strength of ceramic tiles", a thin layer of the mixed adhesive (Tangmu's epoxy resin adhesive) was thinly applied on the concrete slab with a straight edge, and then a thick layer was applied. A toothed trowel with a 6 mm × 6 mm depression and a center spacing of 12 mm was used to comb according to Figure 1 the requirements. The trowel was approximately at an angle of 60° to the substrate, perpendicular to one side of the substrate, and was evenly smeared parallelly to the other end of the concrete. Within 10 min, at least ten ceramic tile samples (with the following dimensions: (50 ± 1) mm × (50 ± 1) mm) were respectively placed on the adhesive, with a spacing of 40 mm between each other, and a pressure block of (2.00 ± 0.015) kg was placed on each test brick and kept for 30 s. After the prepared specimens were cured under standard test conditions for 27 d, a pull-out head was adhered to the test brick with a suitable adhesive (Tangmu's epoxy resin adhesive). After continuing to place for 24 h under standard test conditions, a tensile force was applied at a speed of 250 N / s, and the tensile bond strength was measured, that is, the bond strength was obtained, and the average value and standard deviation were calculated. The smaller the standard deviation, the smaller the data discreteness and the smaller the strength fluctuation.

[0079] (2) "Bead effect" test: The ceramic tile was placed flat, and water was dripped onto the bottom of the tile. Referring to Figure 1 and Figure 2 if water droplets form "beads", it means there is a "bead effect", otherwise there is no "bead effect".

[0080] The test results of each item are shown in Table 1.

[0081] Table 1 Performance test results of examples and comparative examples

[0082]

[0083] From the above data, it can be seen that the ceramic tiles of each example have a high and stable bond strength. For example, the average bond strength is above 0.9 MPa and the standard deviation is below 0.07; in addition, there is no "bead effect".

[0084] Compared with Example 1, in Comparative Example 1, neither the hydrophobic modifier nor the hydrophilic modifier was applied. The overall roughness of the brick bottom was low and the hydrophobicity was strong, resulting in the "bead effect", which led to a lower bonding strength; in Comparative Example 2, the hydrophobic modifier was applied but the hydrophilic modifier was not. Although the overall roughness of the brick bottom was high, the hydrophobicity was strong, resulting in the "bead effect", and the bonding strength was still low; in Comparative Example 3, the content of methyl silicate in the hydrophobic modifier was excessive, resulting in too strong water repellency in the protruding areas of the brick bottom. The brick bottom slurry mainly diffused in the concave areas, which could not effectively improve the bonding strength of the ceramic tile and could not play a role in protecting the roller; in Comparative Example 4, the hydrophilic modifier was applied but the hydrophobic modifier was not, resulting in a lower overall roughness of the brick bottom, and the bonding strength was still low; in Comparative Example 5, the hydrophobic modifier did not contain methyl silicate, resulting in poor hydrophobicity. The brick bottom slurry was not easily diffused to the concave areas, and the overall roughness of the brick bottom was low, resulting in a lower bonding strength; in Comparative Example 6, the hydrophilic modifier did not contain a hydrophilic agent, resulting in weak hydrophilicity of the brick bottom. Over time, the hydrophilicity of some areas of the brick bottom became worse, and "beads" might appear in some areas, or the water contact angle was very large (close to the bead), resulting in a lower bonding strength; in Comparative Example 7, the hydrophilic modifier did not contain a wetting agent, resulting in the inability of the hydrophilic modifier to evenly cover the brick bottom, and the hydrophobicity of some areas of the brick bottom was strong, resulting in the "bead" phenomenon, or the water contact angle was very large (close to the bead), and the bonding strength was low.

[0085] It can be seen from Figure 1 and Figure 2 that there was the "bead" phenomenon in Comparative Example 1, while there was no "bead" phenomenon in Example 1.

[0086] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application rather than to limit the protection scope of the present application. Although the present application has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present application can be modified or equivalently replaced without departing from the essence and scope of the technical solutions of the present application.

Claims

1. A method for modifying the back surface of a ceramic tile, characterized in that, It includes the following steps: First apply a hydrophobic modifier and then a brick bottom slurry to the convex areas of the green body bottom pattern of the ceramic tile, fire it, polish and wax it, grind the edges, then apply a hydrophilic modifier to the bottom of the brick, and dry it to obtain a ceramic tile; Among them, the hydrophobic modifier includes components in the following mass percentages: 1.8% - 5.2% of methyl silicate, 5% - 15% of alumina, 5% - 10% of suspending agent, and 69.8% - 88.2% of water; The hydrophilic modifier includes components in the following mass percentages: 1% - 7% of hydrophilic agent, 0 - 7% of water-based resin, 0.2% - 3% of wetting agent, and 83% - 98.8% of water.

2. The modification method according to claim 1, wherein, The hydrophilic modifier includes components in the following mass percentages: 1% - 5% of hydrophilic agent, 0 - 5% of water-based resin, 0.2% - 1% of wetting agent, and 89% - 98.8% of water.

3. The modification method according to claim 1 or 2, characterized in that, The methyl silicate includes at least one of sodium methyl silicate, potassium methyl silicate, and lithium methyl silicate.

4. The modification method according to claim 1 or 2, characterized in that The hydrophilic agent includes at least one of alkylphenol polyoxyethylene ether, sodium polycarboxylate, and sodium dioctyl sulfosuccinate.

5. The modification method according to claim 1 or 2, characterized in that, The water-based resin includes at least one of water-based polyurethane resin, water-based acrylic resin, water-based alkyd resin, water-based polyester resin, and water-based epoxy resin.

6. The modification method according to claim 1 or 2, characterized in that The wetting agent includes at least one of silicone-modified acrylate and polyether-modified polysiloxane.

7. The modification method according to claim 1 or 2, characterized in that, When applying the hydrophobic modifier to the convex areas of the green body bottom pattern of the ceramic, the method of applying with a rubber roller is adopted.

8. The modification method according to claim 1 or 2, characterized in that, When applying the hydrophilic modifier to the bottom of the brick, the method of applying with a rubber roller or spraying is adopted.

9. The modification method according to claim 1 or 2, characterized in that, The preparation method of the hydrophobic modifier includes the following steps: Mix alumina, suspending agent and water in proportion, grind until the particle size D50 of alumina is less than 10 μm, and then add methyl silicate and disperse to obtain the hydrophobic modifier; and / or the preparation method of the hydrophilic modifier includes the following steps: Mix all raw materials and disperse to obtain the hydrophilic modifier.

10. A ceramic tile prepared by using the modification method according to any one of claims 1 to 9.

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