Ceramic tile with eggshell glaze surface effect and preparation method thereof

Abstract

The invention discloses a ceramic tile with an eggshell glaze surface effect and a preparation method of the ceramic tile. The ceramic tile sequentially comprises a green body layer, a first cover glaze layer, a second cover glaze layer, a pattern layer and an eggshell dry granular glaze layer from bottom to top, wherein the preparation raw materials of the eggshell dry granule glaze layer comprise first matte dry granules, second matte dry granules and bright dry granules, the particle size of the first matte dry granules is larger than that of the second matte dry granules, and the particle size of the second matte dry granules is the same as that of the bright dry granules; and the initial melting temperature of the first cover glaze layer is higher than that of the second cover glaze layer. In the high-temperature firing process, the first matte dry particles with large particle sizes form matte convex areas, the second matte dry particles with small particle sizes and the bright dry particles form concave areas with higher glossiness, and the bright dry particles in the concave areas are randomly distributed to form bright spots, so that a vivid eggshell glaze surface effect is obtained; the first surface glaze layer is filled with the second surface glaze layer which is melted firstly, so that the glaze surface, the touch feeling and the antifouling performance are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of building ceramics, and particularly relates to a ceramic tile with an eggshell glaze surface effect and a preparation method thereof. Background Art

[0002] With the diversification of interior decoration of buildings, imitating the surface of natural materials with special patterns has become a way to improve the surface effect of ceramic tiles. For the glaze layer of bricks with lower glossiness, the design and implementation of special patterns can effectively improve the performance of the glaze layer of ceramic tiles and enhance the decorativeness of ceramic tiles.

[0003] Eggshell glaze is a glaze that imitates the surface texture of eggshells. At present, eggshell glaze mainly optimizes the glaze components and preparation process to make the glaze surface present a soft luster and a smooth surface with delicate texture. However, if you look closely at the structure of the eggshell surface, you will find that its surface usually contains some small calcium protrusions, and the surface of the small protrusions also contains extremely fine protrusions and depressions, with good diffuse reflection, showing a low-gloss matte surface, while the non-protruding depression area has a slightly higher gloss than the calcium protrusion area, and has bright spots, and the protrusion area and the depression area have a perfect transition to form an overall eggshell surface.

[0004] At present, in order to achieve the concave-convex effect of matte glaze, matte dry particles of different particle sizes are usually used for glue dry particle wet glazing to form a concave-convex surface on the same glaze layer. However, the convex area and the concave area of ​​the glaze obtained by this method have the same glossiness, and the anti-fouling performance is poor. In order to achieve a combination of gloss and matte, the convex area is generally polished to improve the glossiness of the glaze, thereby obtaining a glaze with matte in the concave area and gloss in the convex area. However, this glaze effect is exactly the opposite of the glossiness area distribution of the eggshell surface, and a realistic eggshell surface effect cannot be obtained.

[0005] Therefore, there is an urgent need to develop a ceramic tile with a higher degree of simulation and an eggshell glaze surface effect, so that it not only has a concave and convex surface, but also the raised areas have a matte luster, and the recessed areas have bright spots; at the same time, the glaze has a good anti-fouling effect. Summary of the invention

[0006] The present invention aims to solve at least one of the technical problems existing in the above-mentioned prior art. To this end, the present invention provides a ceramic tile with an eggshell glaze surface effect and a preparation method thereof, wherein the surface of the ceramic tile has a realistic eggshell glaze surface effect and has excellent antifouling performance.

[0007] To solve the above technical problems, the first aspect of the present invention provides a ceramic tile, which comprises, from bottom to top, a body layer, a first glaze layer, a second glaze layer, a pattern layer and an eggshell dry particle glaze layer; the raw materials for preparing the eggshell dry particle glaze layer include first matte dry particles, second matte dry particles and bright dry particles, the particle size of the first matte dry particles is larger than the particle size of the second matte dry particles, and the particle size of the second matte dry particles is the same as the particle size of the bright dry particles; the initial melting temperature of the first glaze layer is greater than the initial melting temperature of the second glaze layer.

[0008] Specifically, the ceramic tile of the present invention is provided with an eggshell dry particle glaze layer, and the raw materials for preparing the glaze layer are composed of large-particle first matte dry particles, small-particle second matte dry particles, and bright dry particles. During high-temperature firing, the large-particle first matte dry particles have a higher melting temperature than the small-particle second matte dry particles and bright dry particles, and under a certain firing system, a matte raised area will be formed; while the small-particle second matte dry particles and bright dry particles will form a relatively high-gloss concave area, and the bright dry particles in the concave area are randomly distributed to form bright spots. At the same time, the matte raised area and the bright concave area are formed based on their own melting flow, and the transition is natural, so as to obtain a realistic eggshell glaze surface effect.

[0009] At the same time, the ceramic tile of the present invention is provided with two glaze layers, and the first glaze layer has a higher melting point than the second glaze layer. During the high-temperature firing process, the second glaze layer will melt first and fill the surface of the first glaze layer, which is not only conducive to improving the flatness of the glaze surface, enhancing the glaze surface touch, and further enhancing the realistic effect of the eggshell glaze surface; but also conducive to improving the anti-fouling performance of the glaze surface.

[0010] In some embodiments of the present invention, the particle size of the first matte dry particles is 150-250 mesh. Preferably, the particle size of the first matte dry particles is 200-250 mesh.

[0011] In some embodiments of the present invention, the particle size of the second matte dry particles is 250-325 mesh.

[0012] In some embodiments of the present invention, the mass ratio of the first matte dry particles, the second matte dry particles and the bright dry particles is (10-20): (75-88): (2-5).

[0013] In some embodiments of the present invention, the first matte dry particles and the second matte dry particles have the same chemical composition, and the chemical composition of the first matte dry particles comprises, by weight percentage: 58.00-63.00% SiO 2 17.00-19.00% Al 2 O 3 , 0.01-0.03% Fe 2 O3 , 0.01-0.05% TiO 2 , 5.50-7.00% CaO, 1.00-2.00% MgO, 3.50-4.50% K 2 O, 3.50-4.50% Na 2 O, 0.05-0.20% ZrO 2 , 2.50-3.50% ZnO, 1.50-2.50% BaO, 1.30-2.30% SrO, loss on ignition ≤0.15%.

[0014] In some embodiments of the present invention, the chemical composition of the bright light dry particles includes, by weight percentage: 45.00-48.00% SiO 2 15.00-17.50% Al 2 O 3 , 0.01-0.03% Fe 2 O 3 , 0.03-0.10% TiO 2 , 7.50-9.00% CaO, 3.50-4.00% MgO, 3.00-3.50% K 2 O, 2.00-2.50% Na 2 O, 0.01-0.05% ZrO 2 , 2.80-3.80% ZnO, 8.50-9.50% BaO, 1.50-2.00% SrO, 1.20-1.60% LiO 2 2.60-3.40% B 2 O 3 , loss on ignition ≤0.10%.

[0015] In some embodiments of the present invention, the initial melting temperature of the first glaze layer is 1235-1275°C.

[0016] In some embodiments of the present invention, the chemical composition of the first glaze layer includes, by weight percentage: 48.50-55.00% SiO 2 32.00-36.50% Al 2 O 3 , 0.05-0.13% Fe 2 O 3 , 0.30-0.50% TiO 2 , 0.80-1.20% CaO, 0.30-0.50% MgO, 0.70-1.20% K 2 O, 4.00-4.80% Na 2O, 0.30-0.50% ZrO 2 , 1.50-2.50% ZnO, 2.00-4.00% loss on ignition.

[0017] In some embodiments of the present invention, the initial melting temperature of the second glaze layer is 1110-1155°C.

[0018] In some embodiments of the present invention, the chemical composition of the second glaze layer includes, by weight percentage: 47.00-53.00% SiO 2 22.00-26.00% Al 2 O 3 , 0.05-0.20% Fe 2 O 3 , 0.15-0.20% TiO 2 , 2.50-4.00% CaO, 2.50-3.00% MgO, 4.50-5.20% K 2 O, 1.00-1.50% Na 2 O, 8.00-10.00% ZrO 2 , 2.50-3.50% ZnO, 3.50-5.00% loss on ignition.

[0019] In some embodiments of the present invention, the surface of the eggshell dry particle glaze layer is further provided with a protective glaze layer, and the chemical composition of the protective glaze layer comprises, by weight percentage: 49.0-53.0% SiO 2 15.0-17.0% Al 2 O 3 , 0.10-0.25% Fe 2 O 3 0.05-0.15% TiO 2 , 5.0-7.0% CaO, 3.0-5.0% MgO, 1.50-3.00% K 2 O, 1.00-2.50% Na 2 O, 0.30-0.50% ZrO 2 , 4.0-5.0% ZnO, 10.0-13.0% loss on ignition.

[0020] The second aspect of the present invention provides a method for preparing the above-mentioned ceramic tile, comprising the following steps:

[0021] (1) taking raw materials for preparing the green body layer, preparing powder, and subjecting the powder to dispensing, molding, and drying to obtain the green body layer;

[0022] (2) applying a first glaze, a second glaze, an inkjet-printed pattern, and eggshell dry particles on the surface of the green body layer in sequence to form a first glaze layer, a second glaze layer, a pattern layer, and an eggshell dry particle glaze layer in sequence, and drying and firing to obtain the ceramic tile; the eggshell dry particles include first matte dry particles, second matte dry particles, and glossy dry particles.

[0023] In some embodiments of the present invention, in step (2), after applying the dry eggshell particles, a step of applying a protective glaze to form a protective glaze layer is also included.

[0024] In some embodiments of the present invention, in step (2), the glaze weight of the first glaze layer and the second glaze layer is 550-570 g / m 2 .

[0025] In some embodiments of the present invention, in step (2), the amount of the eggshell dry particles applied is 150-170 g / m 2 .

[0026] In some embodiments of the present invention, in step (2), the maximum sintering temperature is 1170-1210°C.

[0027] In some embodiments of the present invention, in step (2), the sintering period is 55-65 minutes.

[0028] Compared with the prior art, the above technical solution of the present invention has at least the following technical effects or advantages:

[0029] (1) The present invention uses large-sized first matte dry particles, small-sized second matte dry particles and bright dry particles as raw materials to prepare an eggshell dry particle glaze layer; during high-temperature firing, the large-sized first matte dry particles form a matte raised area; while the small-sized second matte dry particles and bright dry particles form a relatively higher gloss concave area, and the bright dry particles in the concave area are randomly distributed to form bright spots. At the same time, the matte raised area and the bright concave area are formed based on their own melt flow, and the transition is natural, thereby obtaining a realistic eggshell glaze surface effect.

[0030] (2) The surface glaze layer of the present invention comprises a first surface glaze layer with a high initial melting temperature and a second surface glaze layer with a low initial melting temperature. During the high-temperature firing process, the second surface glaze layer that melts first will fill the surface of the first surface glaze layer. On the one hand, it is beneficial to improve the flatness of the glaze surface, enhance the tactile feel of the glaze surface, and thus enhance the realistic effect of the eggshell glaze surface; on the other hand, it is also beneficial to improve the anti-fouling performance of the glaze surface. DETAILED DESCRIPTION

[0031] The present invention is described in detail below in conjunction with the examples, so that the technical personnel of the relevant technical field can understand the present invention. It is necessary to point out here that the examples are only used to further illustrate the present invention and cannot be understood as limiting the scope of protection of the present invention. The non-essential improvements and adjustments made to the present invention by the skilled person in the relevant field according to the above invention content should still belong to the scope of protection of the present invention. At the same time, the raw materials mentioned below that are not described in detail are all commercially available products; the process steps or preparation methods that are not mentioned in detail are all process steps or preparation methods known to those skilled in the art.

[0032] Example 1

[0033] A ceramic tile comprises, from bottom to top, a body layer, a first surface glaze layer, a second surface glaze layer, a pattern layer, an eggshell dry particle glaze layer and a protective glaze layer.

[0034] Among them: the raw materials for preparing the eggshell dry particle glaze layer include the first matte dry particles, the second matte dry particles and the bright dry particles in a mass ratio of 10:87:3, and the first matte dry particles and the second matte dry particles have the same chemical composition, and the second matte dry particles and the bright dry particles have the same particle size.

[0035] The first matte dry granules have a particle size of 200-250 meshes, and their chemical composition by weight percentage includes: 59.71% SiO 2 , 18.15% Al 2 O 3 , 0.02% Fe 2 O 3 , 0.03% TiO 2 , 5.83% CaO, 1.78% MgO, 4.07% K 2 O, 3.95% Na 2 O, 0.11% ZrO 2 , 3.22% ZnO, 1.58% BaO, 1.46% SrO, and 0.09% loss on ignition.

[0036] The particle size of the bright dry granules is 250-300 mesh, and its chemical composition by weight percentage includes: 46.85% SiO 2 , 17.06% Al 2 O 3 , 0.02% Fe 2 O 3 , 0.05% TiO 2 , 8.37% CaO, 3.71% MgO, 3.29% K 2 O, 2.16% Na 2 O, 0.02% ZrO 2, 3.25% ZnO, 9.06% BaO, 1.77% SrO, 1.58% LiO 2 2.85% B 2 O 3 , loss on ignition 0.08%.

[0037] The melting point of the first glaze layer is 1253°C, and its chemical composition by weight percentage includes: 52.48% SiO 2 , 34.68% Al 2 O 3 , 0.12% Fe 2 O 3 , 0.39% TiO 2 , 1.08% CaO, 0.44% MgO, 1.12% K 2 O, 4.62% Na 2 O, 0.37% ZrO 2 , 2.08% ZnO, 2.62% loss on ignition.

[0038] The first melting point of the second glaze layer is 1137°C, and its chemical composition by weight percentage includes: 48.12% SiO 2 , 24.68% Al 2 O 3 , 0.12% Fe 2 O 3 , 0.19% TiO 2 , 2.76% CaO, 2.74% MgO, 4.72% K 2 O, 1.22% Na 2 O, 8.27% ZrO 2 , 2.88% ZnO, 4.30% loss on ignition.

[0039] The chemical composition of the protective glaze, by mass percentage, includes: 51.85% SiO 2 、16.53% Al 2 O 3 , 0.19% Fe 2 O 3 , 0.12% TiO 2 , 6.23% CaO, 3.48% MgO, 2.67% K 2 O, 1.83% Na 2 O, 0.41% ZrO 2 , 4.65% ZnO, 12.04% loss on ignition.

[0040] The chemical composition of the green body, by mass percentage, includes: 68.25% SiO2 , 19.34% Al 2 O 3 , 0.31% Fe 2 O 3 , 0.26% TiO 2 , 0.76% CaO, 0.34% MgO, 2.73% K 2 O, 3.53% Na 2 O, 4.48% loss on ignition.

[0041] A method for preparing a ceramic tile comprises the following steps:

[0042] (1) weighing raw materials according to the chemical composition of the green body layer, preparing powder, and subjecting the powder to dispensing, dry pressing, and drying to obtain the green body layer;

[0043] (2) According to the chemical composition of the first glaze layer, the raw materials were weighed and wet-milled to obtain a glaze with a specific gravity of 1.89 g / cm 3 , apply 4 cups of slurry with a flow rate of 64s to obtain the first glaze;

[0044] (3) According to the chemical composition of the second glaze layer, the raw materials were weighed and wet-milled to obtain a glaze with a specific gravity of 1.88 g / cm 3 , apply 4 cups of slurry with a flow rate of 67s to obtain the second glaze;

[0045] (4) mixing the first matte dry particles, the second matte dry particles, and the bright dry particles according to a mass ratio to obtain eggshell dry particles;

[0046] (5) The raw materials were weighed according to the chemical composition of the protective glaze layer and wet-milled to obtain a glaze with a specific gravity of 1.42 g / cm 3 , Apply -4 cups of slurry with a flow rate of 18s to obtain a protective glaze;

[0047] (6) Apply the first glaze (the glaze amount is 558 g / m2) on the surface of the green body layer prepared above. 2 ) and the second glaze (the glaze amount is 558g / m 2 ), inkjet printing patterns, application of eggshell dry particles (application amount is 160g / m 2 ), high pressure spraying protective glaze (the glaze amount is 59g / m 2 ) to form a first glaze layer, a second glaze layer, a pattern layer, an eggshell dry particle glaze layer and a protective glaze layer in sequence, which are dried and fired (the highest firing temperature is 1177°C, the firing cycle is 62 minutes, and the insulation time at the highest firing temperature is 9 minutes) to obtain the ceramic tile of this embodiment.

[0048] Example 2

[0049] A ceramic tile comprises, from bottom to top, a body layer, a first surface glaze layer, a second surface glaze layer, a pattern layer, an eggshell dry particle glaze layer and a protective glaze layer.

[0050] Among them: the raw materials for preparing the eggshell dry particle glaze layer include the first matte dry particles, the second matte dry particles and the bright dry particles in a mass ratio of 12:85:3, and the first matte dry particles and the second matte dry particles have the same chemical composition, and the second matte dry particles have the same particle size as the bright dry particles.

[0051] The first matte dry granules have a particle size of 230-250 meshes, and their chemical composition by weight percentage includes: 60.03% SiO 2 , 17.94% Al 2 O 3 , 0.02% Fe 2 O 3 , 0.03% TiO 2 , 6.11% CaO, 1.58% MgO, 4.14% K 2 O, 3.85% Na 2 O, 0.10% ZrO 2 , 3.18% ZnO, 1.56% BaO, 1.35% SrO, and 0.11% loss on ignition.

[0052] The particle size of the bright dry granules is 270-325 mesh, and its chemical composition by weight percentage includes: 46.85% SiO 2 , 16.76% Al 2 O 3 , 0.02% Fe 2 O 3 , 0.05% TiO 2 , 8.16% CaO, 3.68% MgO, 3.32% K 2 O, 2.34% Na 2 O, 0.02% ZrO 2 , 3.35% ZnO, 9.12% BaO, 1.85% SrO, 1.37% LiO 2 3.05% B 2 O 3 , loss on ignition 0.06%.

[0053] The first glaze layer has a melting point of 1260°C and its chemical composition by weight percentage includes: 53.12% SiO 2 、35.18% Al 2 O 3 , 0.09% Fe 2 O 3 , 0.41% TiO2 , 0.97% CaO, 0.42% MgO, 1.15% K 2 O, 4.22% Na 2 O, 0.43% ZrO 2 , 1.81% ZnO, 2.20% loss on ignition.

[0054] The first melting point of the second glaze layer is 1140°C, and its chemical composition by weight percentage includes: 48.62% SiO 2 , 24.98% Al 2 O 3 , 0.11% Fe 2 O 3 , 0.17% TiO 2 , 2.82% CaO, 2.68% MgO, 4.60% K 2 O, 1.34% Na 2 O, 8.37% ZrO 2 , 2.68% ZnO, 3.63% loss on ignition.

[0055] The chemical composition of the protective glaze, by mass percentage, includes: 50.94% SiO 2 , 16.26% Al 2 O 3 , 0.12% Fe 2 O 3 , 0.13% TiO 2 , 6.64% CaO, 3.67% MgO, 2.68% K 2 O, 1.97% Na 2 O, 0.37% ZrO 2 , 4.58% ZnO, 12.64% loss on ignition.

[0056] The chemical composition of the green body, by mass percentage, includes: 68.25% SiO 2 , 19.34% Al 2 O 3 , 0.31% Fe 2 O 3 , 0.26% TiO 2 , 0.76% CaO, 0.34% MgO, 2.73% K 2 O, 3.53% Na 2 O, 4.48% loss on ignition.

[0057] A method for preparing a ceramic tile comprises the following steps:

[0058] (1) weighing raw materials according to the chemical composition of the green body layer, preparing powder, and subjecting the powder to dispensing, dry pressing, and drying to obtain the green body layer;

[0059] (2) According to the chemical composition of the first glaze layer, the raw materials were weighed and wet-milled to obtain a glaze with a specific gravity of 1.88 g / cm 3 , apply 4 cups of slurry with a flow rate of 68s to obtain the first glaze;

[0060] (3) According to the chemical composition of the second glaze layer, the raw materials were weighed and wet-milled to obtain a glaze with a specific gravity of 1.90 g / cm 3 , apply 4 cups of slurry with a flow rate of 62s to obtain the second glaze;

[0061] (4) mixing the first matte dry particles, the second matte dry particles, and the bright dry particles according to a mass ratio to obtain eggshell dry particles;

[0062] (5) The raw materials were weighed according to the chemical composition of the protective glaze layer and subjected to wet ball milling to obtain a glaze with a specific gravity of 1.41 g / cm 3 , Apply -4 cups of slurry with a flow rate of 16s to obtain a protective glaze;

[0063] (6) Apply the first glaze (the glaze amount is 564 g / m2) on the surface of the green body layer prepared above. 2 ) and the second glaze (the glaze amount is 556g / m 2 ), inkjet printing patterns, application of eggshell dry particles (application amount is 165g / m 2 ), high pressure spraying of protective glaze (the glaze application amount is 62g / m 2 ) to form a first glaze layer, a second glaze layer, a pattern layer, an eggshell dry particle glaze layer and a protective glaze layer in sequence, which are dried and fired (the highest firing temperature is 1178°C, the firing cycle is 63 minutes, and the insulation time at the highest firing temperature is 9 minutes) to obtain the ceramic tile of this embodiment.

[0064] Example 3

[0065] A ceramic tile comprises, from bottom to top, a body layer, a first surface glaze layer, a second surface glaze layer, a pattern layer, an eggshell dry particle glaze layer and a protective glaze layer.

[0066] Among them: the raw materials for preparing the eggshell dry particle glaze layer include the first matte dry particles, the second matte dry particles and the bright dry particles in a mass ratio of 12:85:3, and the first matte dry particles and the second matte dry particles have the same chemical composition, and the second matte dry particles have the same particle size as the bright dry particles.

[0067] The first matte dry granules have a particle size of 230-250 meshes, and their chemical composition by weight percentage includes: 59.71% SiO 2 , 18.15% Al 2 O 3 , 0.02% Fe2 O 3 , 0.03% TiO 2 , 5.83% CaO, 1.78% MgO, 4.07% K 2 O, 3.95% Na 2 O, 0.11% ZrO 2 , 3.22% ZnO, 1.58% BaO, 1.46% SrO, and 0.09% loss on ignition.

[0068] The particle size of the bright dry granules is 250-300 mesh, and its chemical composition by weight percentage includes: 46.85% SiO 2 , 17.06% Al 2 O 3 , 0.02% Fe 2 O 3 , 0.05% TiO 2 , 8.37% CaO, 3.71% MgO, 3.29% K 2 O, 2.16% Na 2 O, 0.02% ZrO 2 , 3.25% ZnO, 9.06% BaO, 1.77% SrO, 1.58% LiO 2 2.85% B 2 O 3 , loss on ignition 0.08%.

[0069] The first glaze layer has a melting point of 1260°C and its chemical composition by weight percentage includes: 53.12% SiO 2 、35.18% Al 2 O 3 , 0.09% Fe 2 O 3 , 0.41% TiO 2 , 0.97% CaO, 0.42% MgO, 1.15% K 2 O, 4.22% Na 2 O, 0.43% ZrO 2 , 1.81% ZnO, 2.20% loss on ignition.

[0070] The first melting point of the second glaze layer is 1140°C, and its chemical composition by weight percentage includes: 48.62% SiO 2 , 24.98% Al 2 O 3 , 0.11% Fe 2 O 3 , 0.17% TiO 2, 2.82% CaO, 2.68% MgO, 4.60% K 2 O, 1.34% Na 2 O, 8.37% ZrO 2 , 2.68% ZnO, 3.63% loss on ignition.

[0071] The chemical composition of the protective glaze, by mass percentage, includes: 50.94% SiO 2 , 16.26% Al 2 O 3 , 0.12% Fe 2 O 3 , 0.13% TiO 2 , 6.64% CaO, 3.67% MgO, 2.68% K 2 O, 1.97% Na 2 O, 0.37% ZrO 2 , 4.58% ZnO, 12.64% loss on ignition.

[0072] The chemical composition of the green body, by mass percentage, includes: 68.25% SiO 2 , 19.34% Al 2 O 3 , 0.31% Fe 2 O 3 , 0.26% TiO 2 , 0.76% CaO, 0.34% MgO, 2.73% K 2 O, 3.53% Na 2 O, 4.48% loss on ignition.

[0073] A method for preparing a ceramic tile comprises the following steps:

[0074] (1) weighing raw materials according to the chemical composition of the green body layer, preparing powder, and subjecting the powder to dispensing, dry pressing, and drying to obtain the green body layer;

[0075] (2) According to the chemical composition of the first glaze layer, the raw materials were weighed and wet-milled to obtain a glaze with a specific gravity of 1.88 g / cm 3 , apply 4 cups of slurry with a flow rate of 68s to obtain the first glaze;

[0076] (3) According to the chemical composition of the second glaze layer, the raw materials were weighed and wet-milled to obtain a glaze with a specific gravity of 1.90 g / cm 3 , apply 4 cups of slurry with a flow rate of 62s to obtain the second glaze;

[0077] (4) mixing the first matte dry particles, the second matte dry particles, and the bright dry particles according to a mass ratio to obtain eggshell dry particles;

[0078] (5) The raw materials were weighed according to the chemical composition of the protective glaze layer and subjected to wet ball milling to obtain a glaze with a specific gravity of 1.41 g / cm 3 , Apply -4 cups of slurry with a flow rate of 16s to obtain a protective glaze;

[0079] (6) Apply the first glaze (the glaze amount is 558 g / m2) on the surface of the green body layer prepared above. 2 ) and the second glaze (the glaze amount is 558g / m 2 ), inkjet printing patterns, application of eggshell dry particles (application amount is 160g / m 2 ), high pressure spraying of protective glaze (the glaze application amount is 62g / m 2 ) to form a first glaze layer, a second glaze layer, a pattern layer, an eggshell dry particle glaze layer and a protective glaze layer in sequence, which are dried and fired (the maximum firing temperature is 1180°C, the firing cycle is 60 minutes, and the insulation time at the maximum firing temperature is 9 minutes) to obtain the ceramic tile of this embodiment.

[0080] Comparative Example 1

[0081] The only difference between Comparative Example 1 and Example 1 is that the raw materials for preparing the eggshell dry particle glaze layer are different. The raw materials for preparing the eggshell dry particle glaze layer of Comparative Document 1 do not contain bright dry particles, but only include first matte dry particles and second matte dry particles, and the particle size, mass ratio and chemical composition of the first matte dry particles and the second matte dry particles are the same as those in Example 1.

[0082] Comparative Example 2

[0083] The only difference between Comparative Example 2 and Comparative Example 1 is that in Comparative Example 2, the raised surface of the ceramic tile prepared in Comparative Example 1 is polished.

[0084] Comparative Example 3

[0085] The only difference between Comparative Example 3 and Example 1 is that the raw materials for preparing the eggshell dry particle glaze layer are different. The raw materials for preparing the eggshell dry particle glaze layer of Comparative Example 3 do not contain the first matte dry particles, and only include the second matte dry particles and the bright dry particles, and the particle size, mass ratio and chemical composition of the second matte dry particles and the bright dry particles are the same as those in Example 1.

[0086] Comparative Example 4

[0087] The only difference between Comparative Example 4 and Example 1 is that the layer structure of the ceramic tile is different. The ceramic tile of Comparative Example 4 does not contain a second glaze layer, but only includes a first glaze layer, and the chemical composition and glaze amount of the first glaze layer are the same as those of Example 1.

[0088] Comparative Example 5

[0089] The only difference between Comparative Example 5 and Example 1 is that the layer structure of the ceramic tile is different. The ceramic tile of Comparative Example 5 does not contain a first glaze layer, but only includes a second glaze layer, and the chemical composition and glaze amount of the second glaze layer are the same as those of Example 1.

[0090] Performance Testing

[0091] The glossiness and antifouling performance of the ceramic tile samples prepared in the above Examples 1-3 and Comparative Examples 1-5 were tested, and the visual effects of the glaze were recorded. The antifouling performance was tested according to GBT 3810.14-2016 "Test Methods for Ceramic Tiles Part 14: Determination of Antifouling". The results are shown in Table 1.

[0092] Table 1:

[0093]

[0094]

[0095] It can be seen from Table 1 that the ceramic tile samples prepared in Examples 1-3 all have a concave-convex glaze effect, and the glossiness of the raised area is 10-12°, with a matte luster; the glossiness of the recessed area is 33-40°, which is higher than that of the raised area, and is distributed with bright spots; at the same time, the matte raised micro-areas and the recessed bright spots have a clear contrast, the glaze has a soft and delicate touch, and has a realistic eggshell surface effect; and the anti-fouling performance is excellent, reaching the highest level 5.

[0096] Comparative Example 1 is relative to Example 1. Since the raw materials for preparing the eggshell dry particle glaze layer do not contain bright dry particles, but only include first matte dry particles and second matte dry particles, both the raised micro-areas and the recessed areas are matte, and no bright spots are formed, resulting in a low degree of simulation of the overall eggshell surface.

[0097] Comparative Example 2, based on the ceramic tile sample prepared in Comparative Example 1, adopts the traditional polishing process to increase the glossiness of the raised areas of the glaze surface, forming bright raised micro-areas and recessed matte areas, and the overall eggshell surface simulation degree is low.

[0098] Comparative Example 3 is relative to Example 1. Since the raw materials for preparing the eggshell dry particle glaze layer do not contain the first matte dry particles, but only include the second matte dry particles and the glossy dry particles, the glaze surface has no concave-convex effect. Although it contains bright spots, the overall eggshell surface simulation degree is still relatively low.

[0099] Compared with Example 1, since the surface glaze layer of the ceramic tile in Comparative Example 4 includes only the first surface glaze layer, the glossiness of the matte raised area formed by the first matte dry particles and the glossy depressions formed by the second matte dry particles and the glossy dry particles are reduced, and the glaze surface feels dull and rough, and the overall eggshell surface simulation degree is low; at the same time, the anti-fouling performance of the glaze surface also decreases.

[0100] Compared with Example 1, since the surface glaze layer of the ceramic tile includes only the second surface glaze layer, the glossiness of the matte raised area formed by the first matte dry particles and the glossy depressions formed by the second matte dry particles and the glossy dry particles are increased, and the glaze surface has defects such as bulges and pinholes due to the lower initial melting temperature of the second surface glaze layer, which not only affects the glaze effect, but also reduces the simulation degree of the eggshell surface; at the same time, the anti-fouling performance of the glaze is also greatly reduced.

[0101] For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, without having to go through creative labor. Therefore, simple improvements made to the present invention by those skilled in the art based on the disclosure of the present invention should be within the protection scope of the present invention. The above embodiments are preferred embodiments of the present invention, and all processes similar to the present invention and equivalent changes made should belong to the protection scope of the present invention.

Claims

1. A ceramic tile, characterized in that: From bottom to top, it includes a body layer, a first glaze layer, a second glaze layer, a pattern layer and an eggshell dry particle glaze layer; the raw materials for preparing the eggshell dry particle glaze layer include first matte dry particles, second matte dry particles and bright dry particles, the particle size of the first matte dry particles is larger than the particle size of the second matte dry particles, and the particle size of the second matte dry particles is the same as the particle size of the bright dry particles; the initial melting temperature of the first glaze layer is larger than the initial melting temperature of the second glaze layer.

2. The ceramic tile according to claim 1, characterized in that: The particle size of the first matte dry particles is 150-250 mesh, and the particle size of the second matte dry particles is 250-325 mesh; and / or, the mass ratio of the first matte dry particles, the second matte dry particles and the bright dry particles is (10-20): (75-88): (2-5).

3. The ceramic tile according to claim 1 or 2, wherein the first matte dry particles and the second matte dry particles have the same chemical composition, and the chemical composition of the first matte dry particles, by weight percentage, comprises: 58.00-63.00% SiO2, 17.00-19.00% Al2O3, 0.01-0.03% Fe2O3, 0.01-0.05% TiO2, 5.50-7.00% CaO, 1.00-2.00% MgO, 3.50-4.50% K2O, 3.50-4.50% Na2O, 0.05-0.20% ZrO2, 2.50-3.50% ZnO, 1.50-2.50% BaO, 1.30-2.30% SrO, loss on ignition ≤0.15%.

4. The ceramic tile according to claim 1 or 2, wherein the chemical composition of the bright dry particles comprises, by weight percentage: 45.00-48.00% SiO2, 15.00-17.50% Al2O3, 0.01-0.03% Fe2O3, 0.03-0.10% TiO2, 7.50-9.00% CaO, 3.50-4.00% MgO, 3.00-3.50% K2O, 2.00-2.50% Na2O, 0.01-0.05% ZrO2, 2.80-3.80% ZnO, 8.50-9.50% BaO, 1.50-2.00% SrO, 1.20-1.60% LiO2, 2.60-3.40% B2O3, loss on ignition ≤0.10%.

5. The ceramic tile according to claim 1, characterized in that: The initial melting temperature of the first glaze layer is 1235-1275°C; and / or the chemical composition of the first glaze layer includes, by weight percentage: 48.50-55.00% SiO2, 32.00-36.50% Al2O3, 0.05-0.13% Fe2O3, 0.30-0.50% TiO2, 0.80-1.20% CaO, 0.30-0.50% MgO, 0.70-1.20% K2O, 4.00-4.80% Na2O, 0.30-0.50% ZrO2, 1.50-2.50% ZnO, and 2.00-4.00% loss on ignition.

6. The ceramic tile according to claim 1 or 5, characterized in that: The initial melting temperature of the second glaze layer is 1110-1155°C; and / or, the chemical composition of the second glaze layer includes, by weight percentage: 47.00-53.00% SiO2, 22.00-26.00% Al2O3, 0.05-0.20% Fe2O3, 0.15-0.20% TiO2, 2.50-4.00% CaO, 2.50-3.00% MgO, 4.50-5.20% K2O, 1.00-1.50% Na2O, 8.00-10.00% ZrO2, 2.50-3.50% ZnO, and 3.50-5.00% loss on ignition.

7. The ceramic tile according to claim 1, characterized in that: A protective glaze layer is also provided on the surface of the eggshell dry particle glaze layer. The chemical composition of the protective glaze layer includes, by weight percentage: 49.0-53.0% SiO2, 15.0-17.0% Al2O3, 0.10-0.25% Fe2O3, 0.05-0.15% TiO2, 5.0-7.0% CaO, 3.0-5.0% MgO, 1.50-3.00% K2O, 1.00-2.50% Na2O, 0.30-0.50% ZrO2, 4.0-5.0% ZnO, and 10.0-13.0% loss on ignition.

8. A method for preparing a ceramic tile according to any one of claims 1 to 7, characterized in that: The following steps are involved: (1) taking raw materials for preparing the green body layer, preparing powder, and subjecting the powder to dispensing, molding, and drying to obtain the green body layer; (2) applying a first glaze, a second glaze, an inkjet-printed pattern, and eggshell dry particles on the surface of the green body layer in sequence to form a first glaze layer, a second glaze layer, a pattern layer, and an eggshell dry particle glaze layer in sequence, and drying and firing to obtain the ceramic tile; the eggshell dry particles include first matte dry particles, second matte dry particles, and glossy dry particles.

9. The method for preparing a ceramic tile according to claim 8, characterized in that: In step (2), the glaze application amount of the first glaze and the second glaze is 550-570g / m 2 ; and / or, the amount of the eggshell dry particles applied is 150-170g / m 2 .

10. The method for preparing a ceramic tile according to claim 8, characterized in that: In step (2), the maximum sintering temperature is 1170-1210° C.; and / or the sintering period is 55-65 minutes.

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