Silky smooth ceramic tile with multi-layered stone texture and preparation method thereof

Abstract

The present invention relates to the field of building materials, and specifically discloses a silky smooth ceramic tile with a multi-layered stone texture and a preparation method thereof. The ceramic tile comprises, from bottom to top, a body layer, a top glaze layer, a pattern layer, a silky smooth glaze layer, and a dry particle layer. The present invention optimizes the glaze formula, compounding medium-temperature frit with high-temperature materials such as quartz and calcined alumina. The top glaze, silky smooth glaze, and dry particles are each specially designed to achieve a balance between the three: using the top glaze as a foundation to achieve a bottom surface with high flatness and few pore defects, perfectly presenting the silky, soft touch of the silky smooth glaze. At the same time, the low-fluidity dry particles are used to stably simulate the linear texture of stone, creating a ceramic tile that has both a silky, moist touch and a multi-layered, high-fidelity stone texture.

Description

Technical Field

[0001] The present invention relates to the field of building ceramics, and in particular to a silky smooth ceramic tile with multi-layered stone texture and a preparation method thereof. Background Art

[0002] Among modern architectural decorative materials, ceramic tiles are widely favored for their durability, ease of cleaning, and diverse decorative effects. As aesthetic standards for living evolve, consumers are placing higher demands on the functionality and artistry of ceramic tiles. On the one hand, they expect a smooth, silky touch to enhance their skin-friendly experience; on the other, they seek the layered texture and natural beauty of natural stone to satisfy their visual aesthetic. However, existing technologies struggle to achieve a balanced optimization of both tactile feel and texture, creating a technical bottleneck that urgently needs to be overcome in the industry.

[0003] Currently, in order to achieve a silky-smooth touch on the surface of ceramic tiles, the industry usually uses low-temperature glaze formulas. The glaze layer fully melts and flows during high-temperature firing, forming a smooth surface with high density and high flatness. However, due to the excessive fluidity of this type of glaze, it is easy to cover or fill the concave and convex textures pre-constructed through processes such as carving and printing, resulting in a loss of the three-dimensional sense and layering of the stone. Conversely, if high-temperature glazes are used to retain the clarity of the texture, the glaze surface will appear hard and rough due to insufficient melting, which makes it difficult to meet users' pursuit of soft textures. In addition, existing texture processes are mostly limited to the expression of lines on a single level, and are unable to reproduce the varied color transitions, differences in transparency, and naturally interwoven texture effects of natural stone, reducing the market competitiveness of the products.

[0004] Therefore, developing a new glaze system and supporting technology to achieve multi-level, high-fidelity stone texture reproduction while ensuring the silky and moist touch of the glaze has become an important direction of technological innovation in the current ceramic tile industry. Summary of the Invention

[0005] The main purpose of the present invention is to provide a silky tile with multi-layered stone texture, which can take into account the silky and soft glaze and the concave and convex texture.

[0006] To achieve the above-mentioned purpose, the present invention proposes a silky smooth ceramic tile with a multi-layered stone texture, which comprises, from bottom to top, a body layer, a glaze layer, a pattern layer, a silky smooth glaze layer and a dry particle layer;

[0007] The raw materials for preparing the surface glaze layer include, by weight, 3-6 parts of potassium feldspar, 35-40 parts of sodium feldspar, 3-6 parts of wollastonite, 2-5 parts of calcined zinc oxide, 3-7 parts of calcined kaolin, 4-7 parts of washed soil, 2-6 parts of dolomite, 5-10 parts of calcined alumina, 4-9 parts of quartz, 16-24 parts of medium-temperature frit, and 10-14 parts of zirconium silicate;

[0008] The raw materials for preparing the silky glaze layer include, by weight, 28-32 parts of potassium feldspar, 10-16 parts of sodium feldspar, 3-8 parts of wollastonite, 4-7 parts of barium carbonate, 3-5 parts of calcined zinc oxide, 6-10 parts of calcined kaolin, 3-6 parts of washed soil, 4-8 parts of dolomite, 4-8 parts of calcined alumina, 1-4 parts of nano-quartz, and 18-25 parts of medium-temperature frit;

[0009] The chemical composition of the raw materials for preparing the dry particle layer includes, by mass percentage, SiO2 44.91-48.55%, Al2O3 17.11-20.08%, Fe2O3 0.09-0.33%, CaO 5.56-7.74%, MgO 3.79-5.21%, K2O 2.01-3.36%, Na2O 1.05-2.35%, BaO 12.84-16.05%, ZnO 2.97-5.64%, ZrO2 0.13-0.32% and LOI 0.56-1.12%;

[0010] The chemical composition of the medium-temperature frit is calculated by mass percentage and includes: SiO2 31.12-35.49%, Al2O 38.54-12.32%, CaO 5.95-9.06%, K2O 7.26-10.23%, Na2O 0.87-1.59%, BaO 33.74-38.64% and LOI 0.85-1.35%.

[0011] The present invention adjusts the glaze and adopts a special top glaze, a silky glaze and dry particles to form a three-layer superposition. The fired tiles ensure that the glaze surface has a silky and moist touch while having a multi-layered, high-fidelity stone convex texture.

[0012] Preferably, the particle size of the nano-quartz is 50-100 nm.

[0013] The present invention also discloses a method for preparing the ceramic tile having multi-layered stone texture, comprising the following steps:

[0014] S1, green body forming: pressing the powder into a shape and drying it to obtain a green body layer;

[0015] S2, glaze: apply the glaze on the surface of the body to form a glaze layer;

[0016] S3, inkjet printing: inkjet printing a pattern texture on the glaze layer to form a pattern layer;

[0017] S4, screen printing: printing the silky glaze on the pattern layer through screen printing to form a silky glaze layer;

[0018] S5, positioning dry particles: applying dry particles on the silky glaze layer to form a dry particle layer;

[0019] S6. Firing: The glazed body is sent into a kiln for firing to obtain the ceramic tile having the multi-layered stone texture.

[0020] Preferably, in step S2, the specific gravity of the glaze is 1.75-1.84 g / mL, the flow rate is 18-25 s, and the glaze amount is 65-72 g / m 2 .

[0021] Preferably, in step S4, the specific gravity of the silky glaze is 1.87-1.92 g / mL, and the flow rate is 65-75 s.

[0022] Preferably, in step S4, the aperture size of the screen is 80-100 mesh, and 3-4 layers are screen-printed.

[0023] Preferably, in step S4, the screen printing is 4 layers, and its process parameters are: the ratio of the repeated area of ​​the second layer of line texture is 80-90% of the line texture area of ​​the first layer; the ratio of the repeated area of ​​the third layer of line texture is 60-70% of the line texture area of ​​the first layer; the ratio of the repeated area of ​​the fourth layer of line texture is 50-60% of the line texture area of ​​the first layer.

[0024] Preferably, in step S5, the particle size of the dry particles is 75-90 mesh, and the dosage is 70-80 g / m 2 .

[0025] Preferably, in step S6, the sintering temperature is 1180-1220° C., and the sintering time is 60-70 min.

[0026] The above preparation method can make the stone texture of the glazed surface after firing more layered. By passing the depth of the texture line through multiple silk screen processes with different effect areas, a line texture effect with different depths can be constructed, realizing a multi-level stone line texture.

[0027] Compared with the prior art, the present invention has at least the following beneficial effects: the present invention achieves a silky and smooth glaze surface and a stone texture with both concave and convex textures, and a good touch, by adjusting the glaze; the multi-layer silk screen process is superimposed to form concave texture areas of different depths, making the transition of line texture more natural and more layered. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 This is a physical picture of the ceramic tile prepared in Example 1;

[0030] Figure 2 This is a physical picture of the tile prepared in Comparative Example 1.

[0031] The realization of the objectives, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. It should be noted that the embodiments in this application and the features in the embodiments can be combined with each other unless there is a conflict. 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 not mentioned in detail are all process steps or preparation methods known to those skilled in the art.

[0033] The invention discloses a silky smooth ceramic tile with multi-layered stone texture, which comprises, from bottom to top, a body layer, a surface glaze layer, a pattern layer, a silky smooth glaze layer and a dry particle layer.

[0034] The raw materials for preparing the surface glaze layer include, by weight, 3-6 parts of potassium feldspar, 35-40 parts of sodium feldspar, 3-6 parts of wollastonite, 2-5 parts of calcined zinc oxide, 3-7 parts of calcined kaolin, 4-7 parts of washed soil, 2-6 parts of dolomite, 5-10 parts of calcined alumina, 4-9 parts of quartz, 16-24 parts of medium-temperature frit and 10-14 parts of zirconium silicate.

[0035] In the ceramic preparation process, the quality of the glaze has a great influence on the feel of the overall glaze of the tile. The careful preparation of the glaze formula in this solution helps to obtain a glaze layer with good touch and no defects. The present invention adopts a medium-temperature frit in combination with the introduction of high-temperature materials such as alumina and silica. By precisely controlling the melting temperature, the glaze is formed into a molten liquid at a suitable temperature during the firing process, thereby obtaining a bottom surface with high flatness and fewer pore defects. At the same time, it avoids the glaze melting temperature being too low to form a molten state in the kiln in advance, resulting in the inability to discharge the gas in the blank, thereby forming a large number of defects such as prickly heat and pinholes on the surface of the glaze. A glaze with good touch is the basis for realizing the present invention to take into account both the touch and texture of the glaze.

[0036] Secondly, the present invention uses the mutual cooperation of silky glaze and dry particles to form a dense glaze layer on the surface of the glaze. In the prior art, a generally stable line structure requires a protective glaze and dry particles with stable properties at high temperatures to prevent the glaze from being in liquid form at high temperatures and increasing its fluidity to fill the concave texture, making it impossible to restore the texture of the stone. However, glazes that are fired at too high a temperature will have a rough texture, which is contrary to the soft touch that the present invention wants to obtain. Therefore, on the one hand, the present invention adjusts and increases a certain proportion of high-temperature materials such as calcined alumina and quartz to act as a skeleton, increase the liquid phase viscosity, and reduce fluidity to maintain the initial line layout structure. At the same time, the proportions of frit, flux and high-temperature materials in the silky glaze are regulated to obtain a combination of silky glaze and dry particles with suitable temperature properties, so that it has both a dense and silky glaze touch and can stably simulate the line texture effect of stone.

[0037] Therefore, the raw materials for preparing the silky glaze layer used in this scheme include, by weight: 28-32 parts of potassium feldspar, 10-16 parts of sodium feldspar, 3-8 parts of wollastonite, 4-7 parts of barium carbonate, 3-5 parts of calcined zinc oxide, 6-10 parts of calcined kaolin, 3-6 parts of washed soil, 4-8 parts of dolomite, 4-8 parts of calcined alumina, 1-4 parts of nano-quartz and 18-25 parts of medium-temperature frit; preferably, the particle size of the nano-quartz is 50-100 nm.

[0038] The chemical composition of the raw materials for preparing the dry particle layer includes, by mass percentage, SiO2 44.91-48.55%, Al2O3 17.11-20.08%, Fe2O3 0.09-0.33%, CaO 5.56-7.74%, MgO 3.79-5.21%, K2O 2.01-3.36%, Na2O 1.05-2.35%, BaO 12.84-16.05%, ZnO 2.97-5.64%, ZrO2 0.13-0.32% and LOI 0.56-1.12%;

[0039] The chemical composition of the medium-temperature frit is calculated by mass percentage and includes: SiO2 31.12-35.49%, Al2O 38.54-12.32%, CaO 5.95-9.06%, K2O 7.26-10.23%, Na2O 0.87-1.59%, BaO 33.74-38.64% and LOI 0.85-1.35%.

[0040] The main components of the medium-temperature frit used in the glaze include silicon dioxide, calcium oxide, barium oxide, etc., which have a significant effect on regulating and reducing the high-temperature viscosity of the glaze thermometer. In addition, nano-quartz with a particle size of 50~100nm is selected in the silky glaze. Due to its small particle size, large specific surface area, and huge surface energy, it interacts strongly with the melt at high temperatures, adsorbing melt molecules through van der Waals forces and hydrogen bonds to form a "quasi-solid" interface layer. Nano-silica is embedded in the melt network as a rigid particle, limiting the slip of molecular chains through physical cross-linking points, increasing the high-temperature shear modulus, and thus improving the viscosity of the system to a certain extent, ensuring that the constructed texture remains stable at high temperatures and reducing structural collapse during high-temperature melting. On the other hand, nanoparticles can be evenly dispersed in the glaze to form a stable suspension, reducing the agglomeration of the glaze, and allowing the glaze to cover the surface of the ceramic body more evenly during the firing process, thereby reducing pinhole defects caused by uneven distribution of the glaze.

[0041] It should be noted that the green body layer in the present invention can be prepared using conventional green body formulations and preparation processes known in the art.

[0042] The dry particles used in the present invention have a suitable melting temperature and high-temperature viscosity, and can be used in combination with the silky glaze to perform local coverage and enhance the stone line texture effect.

[0043] The present invention also provides a method for preparing the above-mentioned multi-layered stone textured ceramic tile, comprising the following steps:

[0044] S1, green body forming: pressing the powder into a shape and drying it to obtain a green body layer;

[0045] S2. Top glaze: Apply the top glaze on the surface of the body to form a top glaze layer; the specific gravity of the top glaze is 1.75~1.84 g / mL, the flow rate is 18~25 s, and the glaze amount is 65~72 g / m 2 ;

[0046] S3, inkjet printing: inkjet printing pattern texture on the glaze layer to form a pattern layer;

[0047] S4. Screen printing: Silky glaze is screen-printed on the pattern layer to form a silky glaze layer; the specific gravity of the silky glaze is 1.87-1.92 g / mL, and the flow rate is 65-75 s; the aperture size of the screen is 80-100 mesh, and 3-4 layers are screen-printed; wherein, the screen printing process parameters are: the ratio of the repeating area of ​​the second layer of line texture is 80-90% of the line texture area of ​​the first layer; the ratio of the repeating area of ​​the third layer of line texture is 60-70% of the line texture area of ​​the first layer; the ratio of the repeating area of ​​the fourth layer of line texture is 50-60% of the line texture area of ​​the first layer; it can be understood that when the screen printing is 3 layers, the design is based on the 3-layer process parameters, and when the screen printing is 4 layers, the design is based on the 4-layer process parameters;

[0048] S5. Positioning dry particles: Apply dry particles on the silky glaze layer to form a dry particle layer; the particle size of the dry particles is 75~90 mesh, and the dosage is 70~80 g / m 2 ; Dry particles are evenly distributed in the area except the lines;

[0049] S6. Firing: The glazed body is sent into a kiln for firing at a temperature of 1180-1220° C. for 60-70 min, thereby obtaining the ceramic tile having a multi-layered stone texture.

[0050] The present invention optimizes and improves the glazing process. First, the glaze is displaced by deep ink to form a concave line texture area. Secondly, the raised area around the line is constructed through three to four repeated screen printings. The printed glaze surface has a high flatness. Finally, the dry particles are positioned on the silky glaze, and the area around the line is further constructed. The depth of the line is deepened through multiple screen and dry particle positioning. The area coverage effect of each screen printing is different, and a line texture effect of different depths is constructed to achieve the purpose of a multi-level texture effect.

[0051] The following examples are further listed to illustrate the present invention in detail. It should also be understood that the following examples are only used to further illustrate the present invention and should not be construed as limiting the scope of protection of the present invention. Some non-essential improvements and adjustments made by those skilled in the art based on the above content of the present invention all fall within the scope of protection of the present invention. The specific process parameters of the following examples are also only examples within a suitable range, that is, those skilled in the art can make selections within a suitable range through the description herein, and are not intended to be limited to the specific numerical values ​​of the examples below. For those in the examples where specific conditions are not specified, proceed according to conventional conditions or the conditions recommended by the manufacturer.

[0052] Example 1

[0053] A method for preparing a silky smooth tile with a multi-layered stone texture comprises the following steps:

[0054] S1, green body forming: pressing the powder into a shape and drying it to obtain a green body layer;

[0055] S2. Top glaze: Apply the top glaze to the surface of the body to form a top glaze layer; wherein, the raw materials for preparing the top glaze include, by weight, 5 parts of potassium feldspar, 40 parts of sodium feldspar, 3 parts of wollastonite, 3 parts of calcined zinc oxide, 4 parts of calcined kaolin, 6 parts of washed clay, 3 parts of dolomite, 8 parts of calcined alumina, 8 parts of quartz, 20 parts of medium-temperature frit, and 12 parts of zirconium silicate. The above raw materials are mixed with 50 parts of water, 0.1 parts of sodium carboxymethyl cellulose, and 0.3 parts of sodium tripolyphosphate and ball milled. The obtained top glaze has a specific gravity of 1.75 g / mL, a flow rate of 18 s, a fineness of 0.25% (above 325 mesh), and a glaze amount of 65 g / m 2 The chemical composition of the medium-temperature frit is expressed in mass percentage as follows: SiO2 34.9%, Al2O3 10.02%, CaO 7.75%, K2O 8.45%, Na2O 1.05%, BaO 36.55% and LOI 1.01%.

[0056] S3, inkjet printing: using deep ink to print pattern texture on the glaze layer to form a pattern layer;

[0057] S4. Screen printing: Silky glaze is screen-printed on the pattern layer to form a silky glaze layer; the raw materials for preparing the silky glaze include, by weight: 30 parts of potassium feldspar, 13 parts of sodium feldspar, 4 parts of wollastonite, 5 parts of barium carbonate, 3 parts of calcined zinc oxide, 8 parts of calcined kaolin, 5 parts of washed clay, 5 parts of dolomite, 5 parts of calcined alumina, 2 parts of nano-quartz and 20 parts of medium-temperature frit. The above raw materials were mixed with 40 parts of water, 0.1 parts of sodium carboxymethyl cellulose, 0.3 parts of sodium tripolyphosphate, and 50 parts of printing paste and ball-milled to obtain a silky glaze with a specific gravity of 1.88 g / mL and a flow rate of 66 s. The chemical composition of the medium-temperature frit, expressed in mass percentage, included 34.9% SiO2, 10.02% Al2O3, 7.75% CaO, 8.45% K2O, 1.05% Na2O, 36.55% BaO, and 1.01% LOI. The particle size of the nanoquartz was 50-100 nm. Four layers were screen-printed using a screen with an aperture of 80-100 mesh. The screen-printing process parameters were as follows: the repeating area ratio of the second layer's line texture was 80% of the first layer's line texture area; the repeating area ratio of the third layer's line texture was 60% of the first layer's line texture area; and the repeating area ratio of the fourth layer's line texture was 50% of the first layer's line texture area.

[0058] S5. Positioning dry granules: Apply dry granules on the silky glaze layer to form a dry granule layer. The chemical composition of the raw materials for preparing the dry granules, in mass percentage, includes: SiO2 46.48%, Al2O3 18.34%, Fe2O3 0.21%, CaO 6.06%, MgO 4.80%, K2O 2.74%, Na2O 1.40%, BaO 14.33%, ZnO 4.49%, ZrO2 0.24%, and LOI 0.84%. The particle size of the dry granules is 75-90 mesh, and the dosage is 75 g / m 2 ;

[0059] S6. Firing: The glazed body is sent into a kiln for firing at a temperature of 1210° C. for 65 minutes, thereby obtaining the ceramic tile having a multi-layered stone texture.

[0060] Example 2

[0061] This example adopts the same preparation method as Example 1, with the only difference being:

[0062] In step S2, the raw materials for preparing the top glaze include, by weight, 5 parts of potassium feldspar, 38 parts of sodium feldspar, 5 parts of wollastonite, 3 parts of calcined zinc oxide, 6 parts of calcined kaolin, 6 parts of washed clay, 3 parts of dolomite, 8 parts of calcined alumina, 8 parts of quartz, 18 parts of medium-temperature frit, and 12 parts of zirconium silicate. The above raw materials were mixed with 50 parts of water, 0.1 parts of sodium carboxymethyl cellulose, and 0.3 parts of sodium tripolyphosphate and ball milled. The resulting top glaze had a specific gravity of 1.77 g / mL, a flow rate of 19 s, a fineness of 0.26% (325 mesh), and a glaze application rate of 67 g / m3. 2 .

[0063] Example 3

[0064] This example adopts the same preparation method as Example 1, with the only difference being:

[0065] In step S4, the raw materials for preparing the silky glaze include, by weight, 30 parts potassium feldspar, 15 parts sodium feldspar, 4 parts wollastonite, 5 parts barium carbonate, 3 parts calcined zinc oxide, 7 parts calcined kaolin, 4 parts washed clay, 5 parts dolomite, 7 parts calcined alumina, 2 parts nanoquartz, and 22 parts medium-temperature frit. These raw materials were mixed with 40 parts water, 0.1 part sodium carboxymethyl cellulose, 0.3 part sodium tripolyphosphate, and 50 parts printing paste and ball-milled. The resulting silky glaze had a specific gravity of 1.86 g / mL and a flow rate of 68 s.

[0066] Comparative Example 1

[0067] This comparative example adopts the same preparation method as Example 1, with the only difference being:

[0068] In step S2, the raw materials for preparing the top glaze include, by weight, 5 parts of potassium feldspar, 40 parts of sodium feldspar, 3 parts of wollastonite, 3 parts of calcined zinc oxide, 4 parts of calcined kaolin, 6 parts of washed clay, 3 parts of dolomite, 11 parts of calcined alumina, 10 parts of quartz, 15 parts of medium-temperature frit, and 12 parts of zirconium silicate. The above raw materials were mixed with 50 parts of water, 0.1 parts of sodium carboxymethyl cellulose, and 0.3 parts of sodium tripolyphosphate and ball milled. The resulting top glaze had a specific gravity of 1.77 g / mL, a flow rate of 20 s, a fineness of 0.23% (325 mesh), and a glaze weight of 66 g / m 2 .

[0069] Comparative Example 2

[0070] This comparative example adopts the same preparation method as Example 1, with the only difference being:

[0071] In step S2, the raw materials for preparing the top glaze include, by weight, 5 parts of potassium feldspar, 40 parts of sodium feldspar, 3 parts of wollastonite, 3 parts of calcined zinc oxide, 2 parts of calcined kaolin, 5 parts of washed clay, 3 parts of dolomite, 2 parts of calcined alumina, 8 parts of quartz, 25 parts of medium-temperature frit, and 12 parts of zirconium silicate. The above raw materials were mixed with 50 parts of water, 0.1 parts of sodium carboxymethyl cellulose, and 0.3 parts of sodium tripolyphosphate and ball milled. The resulting top glaze had a specific gravity of 1.77 g / mL, a flow rate of 19 s, a fineness of 0.27% (325 mesh), and a glaze weight of 63 g / m3. 2 .

[0072] Comparative Example 3

[0073] This comparative example adopts the same preparation method as Example 1, with the only difference being:

[0074] In step S4, the raw materials for preparing the silky glaze include, by weight, 30 parts potassium feldspar, 18 parts sodium feldspar, 4 parts wollastonite, 5 parts barium carbonate, 3 parts calcined zinc oxide, 8 parts calcined kaolin, 5 parts washed clay, 5 parts dolomite, 11 parts calcined alumina, 4 parts nanoquartz, and 23 parts medium-temperature frit. These raw materials were mixed with 40 parts water, 0.1 part sodium carboxymethyl cellulose, 0.3 part sodium tripolyphosphate, and 50 parts printing paste and ball-milled. The resulting silky glaze had a specific gravity of 1.90 g / mL and a flow rate of 70 s.

[0075] Comparative Example 4

[0076] This comparative example adopts the same preparation method as Example 1, with the only difference being:

[0077] In step S4, the raw materials for preparing the silky glaze include, by weight, 26 parts potassium feldspar, 13 parts sodium feldspar, 4 parts wollastonite, 5 parts barium carbonate, 3 parts calcined zinc oxide, 10 parts calcined kaolin, 7 parts washed clay, 5 parts dolomite, 8 parts calcined alumina, 4 parts nanoquartz, and 15 parts medium-temperature frit. These raw materials were mixed with 40 parts water, 0.1 part sodium carboxymethyl cellulose, 0.3 part sodium tripolyphosphate, and 50 parts printing paste and ball-milled. The resulting silky glaze had a specific gravity of 1.89 g / mL and a flow rate of 68 s.

[0078] Comparative Example 5

[0079] This comparative example adopts the same preparation method as Example 1, with the only difference being:

[0080] In step S4, the nano-quartz in the silky glaze raw material is replaced with a conventional particle size of 300 mesh.

[0081] Comparative Example 6

[0082] This comparative example adopts the same preparation method as Example 1, with the only difference being:

[0083] In step S4, the screen printing process is as follows: the line texture repetition area of ​​the 4-layer screen printing is 100%.

[0084] Comparative Example 7

[0085] The preparation method of this comparative example does not include step S5, and the remaining steps are the same as those in Example 1.

[0086] Comparative Example 8

[0087] This comparative example adopts the same preparation method as Example 1, with the only difference being:

[0088] In step S5, the dry granule dosage is 68 g / m 2 .

[0089] Comparative Example 9

[0090] This comparative example adopts the same preparation method as Example 1, with the only difference being:

[0091] In step S5, the dry granule dosage is 82 g / m 2 .

[0092] The fired tiles from Examples 1-3 and Comparative Examples 1-9 were subjected to edge grinding only. The tiles were then tested for tactile feel and stone texture. Glossiness was measured in accordance with the national standard GB / T 13891-2008, "Measurement of Specular Glossiness of Building Finishing Materials." The results are shown in Table 1.

[0093] Table 1

[0094]

[0095] As shown in Table 1, the glaze surfaces of the tiles prepared in Examples 1 to 3 are smooth and silky to the touch, with clear and distinct textures, and the line textures have a multi-layered effect, such as Figure 1 The embodiment 1 shown has a good glaze effect imitating stone texture.

[0096] In the glaze composition of Comparative Example 1, the proportion of medium-temperature frit is reduced, and the proportion of calcined alumina and quartz added is increased. Accordingly, the content of high-temperature skeleton materials such as Al and Si increases. During the firing process, it is difficult for the glaze to melt at high temperatures, and only a small amount of liquid phase can appear. This directly leads to high liquid phase viscosity at higher temperatures, poor glaze fluidity, and uneven glaze after cooling, with a wrinkled surface like orange peel. Secondly, the reduction in the proportion of frit also leads to a lower content of 1-valent and 2-valent elements in the entire glaze system. Therefore, there are fewer fine crystals generated by these elements, making the entire glaze surface appear stiff and rough. Figure 2 shown.

[0097] Comparative Example 2 changes the addition ratio of calcined kaolin, calcined alumina and medium-temperature frit. The proportion of medium-temperature frit in the glaze is too high. Although the excess flux helps to build a smooth and dense glaze layer, the glaze is a relatively low-temperature glaze at this time. Without the temperature control of the high-temperature material, the glaze melts prematurely to form a liquid, resulting in poor exhaust of the gas generated in the body, which causes a large number of prickly heat to form on the glaze. At the same time, as part of the gas is discharged and cooled, pinhole defects are left behind. In addition, the liquid phase formed prematurely by the low-temperature glaze will also drive the temperature of the upper protective glaze to drop. Without the support of the skeleton material, the constructed line texture will be slowly filled by the flowing glaze, resulting in a silky glaze but without any three-dimensional effect of lines.

[0098] In comparative example 3, the addition amounts of sodium feldspar and calcined alumina in the silky glaze were adjusted to increase the addition ratio of the medium-temperature frit. The temperature of the upper glaze system was too low, and the glaze melted and leveled the lines, resulting in unclear concave and convex textures.

[0099] In Comparative Example 4, the addition amounts of potassium feldspar, washed soil and medium-temperature frit were adjusted, so that the addition ratio of medium-temperature frit was too low. The top glaze provided most of the glaze tactile effect and had a certain silky feel, but the surface of the silky glaze lacked fine crystal formation and the glaze surface was not smooth, thereby reducing the overall tactile effect of the glaze.

[0100] The quartz type used in the silky glaze in Comparative Example 5 is particles of conventional particle size. After high-temperature firing, a small number of pinholes will appear on the surface. However, in Comparative Example 1, basically no pinholes were found on the glaze surface, indicating that the nano-SiO2 particles better fill the tiny pores on the surface of the blank, reduce the formation of bubbles, and thus reduce the occurrence of pinhole defects.

[0101] In Comparative Example 6, four layers of silk screen are set to a consistent texture effect. After firing, a single-layer line effect is obtained. Although the line is relatively clear and obvious, it lacks the change of natural texture transition and lacks a real feeling in texture.

[0102] Although comparative example 7 has undergone multiple screen printings, it lacks the height reinforcement of the top layer of dry particles, so the concave and convex texture of the fired tile glaze lines is not obvious.

[0103] In Comparative Example 8, the amount of dry particles was reduced, that is, the height around the line texture initially constructed by the dry particles was weakened. Therefore, compared with Example 1, the line concave-convex texture effect was weaker.

[0104] In Comparative Example 9, the amount of dry particles was increased, but the line effect was not as profound as expected. This was because excessive dry particles would fall into the gaps in the line texture during the application process, and these dry particles would fill the gaps during the firing process, thereby reducing the height of the line effect.

[0105] In summary, the present invention adjusts the addition ratio of each component in the surface glaze and silky glaze, improves the melting temperature and high-temperature viscosity of the glaze during the firing process, accurately controls the appropriate initial melting point to ensure the good texture and feel of the tile glaze, and at the same time constructs the stability of the concave and convex texture lines, and cooperates with the use of dry particles and the physical superposition of the silk screen process to construct a multi-level line texture, realizing the natural transition trend imitating natural stone.

[0106] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention specification under the inventive concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A silky tile with multi-layered stone texture, characterized in that: From bottom to top, it includes body layer, glaze layer, pattern layer, silky glaze layer and dry particle layer; The raw materials for preparing the surface glaze layer include, by weight, 3-6 parts of potassium feldspar, 35-40 parts of sodium feldspar, 3-6 parts of wollastonite, 2-5 parts of calcined zinc oxide, 3-7 parts of calcined kaolin, 4-7 parts of washed soil, 2-6 parts of dolomite, 5-10 parts of calcined alumina, 4-9 parts of quartz, 16-24 parts of medium-temperature frit, and 10-14 parts of zirconium silicate; The raw materials for preparing the silky glaze layer include, by weight, 28-32 parts of potassium feldspar, 10-16 parts of sodium feldspar, 3-8 parts of wollastonite, 4-7 parts of barium carbonate, 3-5 parts of calcined zinc oxide, 6-10 parts of calcined kaolin, 3-6 parts of washed soil, 4-8 parts of dolomite, 4-8 parts of calcined alumina, 1-4 parts of nano-quartz, and 18-25 parts of medium-temperature frit; The chemical composition of the raw materials for preparing the dry particle layer includes, by mass percentage, SiO2 44.91-48.55%, Al2O3 17.11-20.08%, Fe2O3 0.09-0.33%, CaO 5.56-7.74%, MgO 3.79-5.21%, K2O 2.01-3.36%, Na2O 1.05-2.35%, BaO 12.84-16.05%, ZnO 2.97-5.64%, ZrO2 0.13-0.32% and LOI 0.56-1.12%; The chemical composition of the medium-temperature frit is calculated by mass percentage and includes: SiO2 31.12-35.49%, Al2O3 8.54-12.32%, CaO 5.95-9.06%, K2O 7.26-10.23%, Na2O 0.87-1.59%, BaO 33.74-38.64% and LOI 0.85-1.35%.

2. The silky tile with multi-layered stone texture as claimed in claim 1, characterized in that: The particle size of the nano-quartz is 50-100 nm.

3. A method for preparing a silky smooth tile with multi-layered stone texture as claimed in any one of claims 1 or 2, characterized in that: The steps include: S1, green body forming: pressing the powder into a shape and drying it to obtain a green body layer; S2, glaze: apply the glaze on the surface of the body to form a glaze layer; S3, inkjet printing: inkjet printing a pattern texture on the glaze layer to form a pattern layer; S4, screen printing: printing the silky glaze on the pattern layer through screen printing to form a silky glaze layer; S5, positioning dry particles: applying dry particles on the silky glaze layer to form a dry particle layer; S6. Firing: The glazed body is sent into a kiln for firing to obtain the ceramic tile having the multi-layered stone texture.

4. The preparation method according to claim 3, wherein In step S2, the specific gravity of the glaze is 1.75-1.84 g / mL, the flow rate is 18-25 s, and the glaze amount is 65-72 g / m 2 .

5. The preparation method according to claim 3, wherein In step S4, the specific gravity of the silky glaze is 1.87-1.92 g / mL, and the flow rate is 65-75 s.

6. The preparation method according to claim 3, wherein In step S4, the aperture size of the screen is 80-100 mesh, and 3-4 layers are screen-printed.

7. The preparation method according to claim 6, wherein In step S4, the screen printing is 4 layers, and its process parameters are: the ratio of the repeated area of ​​the second layer of line texture is 80-90% of the line texture area of ​​the first layer; the ratio of the repeated area of ​​the third layer of line texture is 60-70% of the line texture area of ​​the first layer; the ratio of the repeated area of ​​the fourth layer of line texture is 50-60% of the line texture area of ​​the first layer.

8. The preparation method according to claim 3, wherein In step S5, the particle size of the dry particles is 75-90 mesh, and the dosage is 70-80 g / m 2 .

9. The preparation method according to claim 3, wherein In step S6, the firing temperature is 1180-1220° C., and the firing time is 60-70 min.

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