Ceramic tile having a cloisonné decorative effect on the surface and method for manufacturing the same

Abstract

The application provides a ceramic tile with a surface having a cloisonne color decoration effect and a preparation method thereof, and relates to the technical field of building decoration building materials. The preparation method of the ceramic tile with the surface having the cloisonne color decoration effect comprises the following steps: applying a base glaze, printing a color pattern, positioning metal dry particles, printing glue, applying glass dry particles, spraying a suspension glaze, and firing. Through steps such as positioning of the metal dry particles and application of the glass dry particles similar to the wire drawing process, the ceramic tile presents the cloisonne color decoration effect with strong three-dimensionality and artistic sense, rich colors and exquisite patterns, and can meet the demand of consumers for high-end decoration materials.

Description

Technical Field

[0001] The present application relates to the technical field of architectural decoration and building materials, and in particular to a ceramic tile with an enamel decorative effect on the surface and a preparation method thereof. Background Art

[0002] Existing enamel decoration technology is mainly used in aluminum alloy curtain wall panels, steel plates, titanium alloy cloisonné enamel crafts, enamel building components, and precious metal local decoration. However, existing enamel decoration technology has many shortcomings when applied to ceramic tile surfaces, including:

[0003] 1. Material property mismatch: Due to the significant differences in material properties between ceramic tiles and commonly used materials such as aluminum alloy, steel, and titanium alloy in existing enamel decoration technologies, the direct application of these technologies will lead to poor decorative effects and even damage the tile surface.

[0004] 2. Process complexity and high cost: When existing cloisonné enamel, cloisonné glue enamel and other processes are implemented on ceramic tiles, not only the process is complicated, but also the cost is high, which is not suitable for large-scale production of ceramic tiles.

[0005] 3. Unstable decorative effect: The application effect of some enamel decoration technologies on tiles is unstable, and problems such as color fading and dry particles falling off are prone to occur, affecting the durability and aesthetics of the decorative effect.

[0006] 4. Limited scope of application: Existing enamel decoration technologies are mostly designed for specific materials or specific decoration needs, and lack universal technology suitable for large-area decoration of tile surfaces.

[0007] Therefore, it is necessary to develop a method that is suitable for the enamel decoration effect on the surface of ceramic tiles. Summary of the Invention

[0008] The purpose of this application is to provide a ceramic tile with an enamel decorative effect on the surface and a preparation method thereof, aiming to solve the problem that the existing cloisonné enamel, cloisonné glue enamel and other processes are applied to ceramic tiles at high cost and complex process, and are not suitable for large-scale production of ceramic tiles.

[0009] To achieve the above objectives, the present application provides a method for preparing a ceramic tile having an enamel decorative effect on its surface, comprising:

[0010] Apply base glaze and print color patterns on the surface of the tile blank in sequence;

[0011] Positioning metal dry particles on the ceramic tile blank formed with a color pattern to obtain an image line outlined by the metal dry particles;

[0012] On the surface of the tile blank with the image line outline formed, glue patterns are printed, glassy dry particles are applied, and suspended glaze slurry is sprayed;

[0013] The ceramic tile blanks sprayed with the suspended glaze slurry are fired to obtain ceramic tiles with enamel decorative effects on the surface.

[0014] In some embodiments, the metal dry particles include one or more of aluminum powder, copper powder, and iron powder;

[0015] And / or, the particle size of the metal dry particles is 0.1-0.5 mm.

[0016] In some embodiments, the metal dry particles are positioned by dispensing with a dispensing machine;

[0017] Alternatively, the metal dry particles are positioned by electrostatic adsorption by applying an electrostatic field on the surface of the ceramic tile.

[0018] In some embodiments, the positioning of the metal dry particles satisfies at least one of the following characteristics AC:

[0019] A. The dispensing speed of the dispensing machine is 10-20 times / second, the dispensing pressure is 0.2-0.5 MPa, the needle diameter of the dispensing machine is 0.2-0.5 mm, and the distance between the needle of the dispensing machine and the surface of the tile blank is maintained at 2-5 mm;

[0020] B. The glue used in the dispensing machine is selected from bisphenol A epoxy resin;

[0021] C. The dispensing machine is a dual-liquid dispensing machine, and the glue used in the dual-liquid dispensing machine includes glue A and glue B, and the glue A and the glue B are mixed in a mass ratio of 1:1 to 2:1;

[0022] D. The voltage of the electrostatic field is 10-30 kilovolts, the action time of the electrostatic field is 5-10 seconds, and the distance between the electrode applying the electrostatic field and the surface of the tile blank is 5-10 centimeters.

[0023] In some embodiments, the viscosity of the glue used to print the glue pattern is 500-1000 centipoise;

[0024] and / or, the printing speed of the printed glue pattern is 10-20 m / min;

[0025] And / or, the glue used for printing the glue pattern is an acrylate glue; preferably, the acrylate glue is one or both of epoxy-modified acrylate glue and polyurethane-modified acrylate glue.

[0026] In some embodiments, the step of donating glassy dry particles satisfies at least one of the following conditions:

[0027] a. The vitreous dry particles are barium-containing vitreous dry particles;

[0028] b. The vitreous dry particles are barium-containing vitreous dry particles, wherein the barium-containing vitreous dry particles comprise, by mass percentage, SiO2 55%-65%, BaO 15%-20%, Al2O3 10%-15% and Na2O 5%-10%;

[0029] c. The particle size of more than 80 wt % of the glassy dry particles is between 0.1 and 0.5 mm;

[0030] d. The glassy dry particles have a Mohs hardness of 5-7;

[0031] e. The thermal expansion coefficient of the glassy dry particles is 50×10 -7 / ℃-80×10 -7 / ℃;

[0032] f. The glassy dry particles are applied at a rate of 5-10 g / s;

[0033] The dispensing accuracy of the glassy dry particles is ±0.1 mm.

[0034] h. After applying the vitreous dry particles, a suction device is used to remove unbound vitreous dry particles; the suction force of the suction device is 10-20 Newtons, the nozzle diameter is 10-30 mm, and the action time is 5-10 seconds.

[0035] In some embodiments, the thickness of the underglaze is 0.1-0.3 mm;

[0036] And / or, the viscosity of the base glaze is 30-50 seconds and the specific gravity is 1.5-1.8 g / cm3 when tested on a No. 4 cup;

[0037] And / or, the color pattern is printed by a digital inkjet printer, the resolution of the digital inkjet printer is 300-600 dpi, and the viscosity of the ink is 10-20 centipoise.

[0038] In some embodiments, the mass concentration of the suspending agent in the suspended glaze slurry is 40-60%;

[0039] And / or, the spraying pressure is 0.3-0.5 MPa;

[0040] And / or, the thickness of the suspended glaze slurry is 0.2-0.4 mm.

[0041] In some embodiments, the firing temperature is 1100-1300° C., and the firing time is 30-60 minutes.

[0042] The present application also provides a ceramic tile with an enamel decorative effect on the surface, which is prepared by the above-mentioned method for preparing a ceramic tile with an enamel decorative effect on the surface.

[0043] Compared with the prior art, the advantages of this application include:

[0044] In this application, positioning metal particles on a ceramic tile blank with a colored pattern creates a clear outline of the metal particle lines on the ceramic tile blank, enhancing the three-dimensional and artistic quality of the pattern. The entire process is rationally designed, with each step seamlessly connected, from underglaze application to firing, enabling efficient production of ceramic tiles with enamel-decorated effects, improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope of the present application.

[0046] Figure 1 This is a sample picture of a ceramic tile with an enamel decorative effect on the surface prepared in Example 1 of the present application;

[0047] Figure 2 This is a sample picture of a ceramic tile with an enamel decorative effect on the surface prepared in Example 2 of the present application. DETAILED DESCRIPTION

[0048] As used herein:

[0049] "Prepared from" is synonymous with "comprising." As used herein, the terms "comprising," "including," "having," "containing," or any other variations thereof, are intended to cover a non-exclusive inclusion. For example, a composition, process, method, article, or apparatus that comprises the listed elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such composition, process, method, article, or apparatus.

[0050] The conjunction "consisting of" excludes any unspecified element, step, or component. If used in a claim, this phrase renders the claim closed, excluding materials other than those described, except for conventional impurities associated therewith. When the phrase "consisting of" appears in a clause of the body of a claim, rather than immediately following the subject matter, it limits only the elements described in that clause; other elements are not excluded from the claim as a whole.

[0051] When an amount, concentration, or other value or parameter is expressed as a range, a preferred range, or a range defined by a series of upper preferred values ​​and lower preferred values, this should be understood as specifically disclosing all ranges formed by any pairing of any range upper limit or preferred value with any range lower limit or preferred value, regardless of whether the range is disclosed alone. For example, when a range of "1 to 5" is disclosed, the described range should be interpreted as including the range "1 to 4", "1 to 3", "1 to 2", "1 to 2 and 4 to 5", "1 to 3 and 5", etc. When a numerical range is described herein, unless otherwise stated, the range is intended to include its end values ​​and all integers and fractions within the range.

[0052] In these examples, parts and percentages are by mass unless otherwise indicated.

[0053] "Parts by mass" refers to the basic unit of measurement used to express the mass ratio of multiple components. One part can represent any unit of mass, such as 1g or 2.689g. If we say that the mass of component A is a parts and the mass of component B is b parts, this means the ratio of the mass of component A to the mass of component B is a:b. Alternatively, we could say that the mass of component A is aK and the mass of component B is bK (K is an arbitrary number representing a multiplication factor). It's important to note that, unlike parts by mass, the sum of the mass of all components is not limited to 100 parts.

[0054] "And / or" is used to indicate that one or both of the stated situations may occur, for example, A and / or B includes (A and B) and (A or B).

[0055] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0056] The present application provides a method for preparing a ceramic tile having an enamel decorative effect on the surface, comprising:

[0057] Apply base glaze and print color patterns on the surface of the tile blank in sequence;

[0058] Positioning metal dry particles on the ceramic tile blank formed with a color pattern to obtain an image line outlined by the metal dry particles;

[0059] On the surface of the tile blank with the image line outline formed, glue patterns are printed, glassy dry particles are applied, and suspended glaze slurry is sprayed;

[0060] The ceramic tile blanks sprayed with the suspended glaze slurry are fired to obtain ceramic tiles with enamel decorative effects on the surface.

[0061] In this application, positioning metal particles on a ceramic tile blank with a colored pattern creates a clear outline of the metal particle lines on the ceramic tile blank, enhancing the three-dimensional and artistic quality of the pattern. The entire process is rationally designed, with each step seamlessly connected, from underglaze application to firing, enabling efficient production of ceramic tiles with enamel-decorated effects, improving production efficiency.

[0062] In some embodiments, the metal dry particles are positioned by dispensing with a glue dispenser; glue is squeezed out through the needle of the glue dispenser and then covers the metal dry particles to fix the dry particles. After the glue solidifies, the metal dry particles are firmly fixed on the surface of the tile, and then the metal dry particles floating on the surface of the embryo that are not firmly positioned are removed.

[0063] In some embodiments, the metal particles are positioned by electrostatically adsorbing them onto the surface of the tile. This electrostatic field allows the metal particles to overcome gravity and other resistance forces, adsorbing them to specific locations on the tile surface to form a line outline. Any metal particles that are not firmly adsorbed can be removed.

[0064] The preparation method of the present application introduces a positioning method of dispensing positioning by a dispensing machine or electrostatic adsorption positioning. Compared with existing cloisonné enamel, cloisonné glue dripping enamel and other processes, it can obtain enamel decoration effects with rich colors, exquisite patterns, strong three-dimensional sense and artistic sense, while making the production process more stable and controllable, reducing scrap rate, improving production efficiency and reducing production costs.

[0065] It should be noted that the image line contours outlined in this application are drawn using a dispensing machine or electrostatic adsorption technology. For the dispensing machine or electrostatic adsorption technology, the silver paste, silver wire, etc. in the existing enamel decoration cannot be accurately positioned. Therefore, in some embodiments, the metal dry particles include one or more of aluminum powder, copper powder, and iron powder; granular materials such as aluminum powder, copper powder, and iron powder are more suitable for use in a dispensing machine or electrostatic adsorption technology. At the same time, the color and texture of silver paste and silver wire are relatively single, and aluminum powder, copper powder, and iron powder are conducive to obtaining a variety of decorative effects.

[0066] In addition, different metal materials may have different physical and chemical properties, such as hardness, melting point, affinity with glue, etc. These properties will affect the bonding effect between dry particles and tile surface and glue. Specifically:

[0067] (1) Aluminum, copper, and iron all have a certain degree of hardness, which can form relatively clear and durable line outlines on the surface of tiles. Compared with some softer materials, they are less likely to deform or wear during subsequent processing and use, and can better maintain the three-dimensional and artistic sense of the pattern.

[0068] (2) Aluminum powder, copper powder, and iron powder each have unique colors and lusters, which can add different visual effects to the decorative effects of tile surfaces. Copper powder can bring a golden or bronze luster, aluminum powder may appear silver or metallic, and iron powder may have a black or gray hue. Mixing aluminum powder, copper powder, and iron powder can create a more diverse combination of colors and textures. By adjusting the ratio of different metal powders, different tones and luster effects can be obtained to meet more personalized decorative needs. These rich colors can be combined with other decorative elements to create rich and diverse decorative effects.

[0069] (3) Aluminum powder, copper powder, and iron powder have good compatibility with common glues such as epoxy resin AB glue. The metal surface can form chemical bonds or adsorption with glue molecules. These physical and chemical reactions can enhance the bonding force between the glue and the metal, making the metal dry particles more stably fixed to the tile surface.

[0070] (4) Aluminum, copper, and iron have relatively good chemical stability under normal environmental conditions. They will not easily undergo chemical reactions on the surface of tiles to cause discoloration, corrosion, and other problems, which is conducive to ensuring the durability of the decorative effect.

[0071] In some embodiments, the particle size of the metal dry particles is 0.1-0.5 mm, for example, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, or any value between 0.1-0.5 mm. First, a suitable particle size can ensure uniform distribution of the dry particles on the surface of the tile. Too large a particle size may cause dry particles to accumulate, affecting the fineness and firmness of the pattern. Too small a particle size may make it difficult for the surface dry particles to be effectively fixed by the glue, causing them to fall off easily. At the same time, it may cause the outline of the image to have a weak three-dimensional sense, thereby affecting the decorative effect. Second, a suitable particle size is conducive to a relatively stable thermal expansion coefficient. During the firing process, the thermal expansion coefficients of the glaze and the dry particles can be better matched, which is conducive to suppressing cracking caused by temperature changes. Finally, the tile has high hardness and wear resistance, which requires the glaze and dry particles to adapt to its surface characteristics during the firing process to avoid glaze peeling or dry particle shedding.

[0072] In some embodiments, the positioning of the metal dry particles satisfies at least one of the following characteristics AC:

[0073] A. The dispensing speed of the dispensing machine is 10-20 times / second, the dispensing pressure is 0.2-0.5 MPa, the needle diameter of the dispensing machine is 0.2-0.5 mm, and the distance between the needle of the dispensing machine and the surface of the tile blank is maintained at 2-5 mm;

[0074] The dispensing speed of the glue dispenser is 10-20 times / second, for example, 10 times / second, 12 times / second, 15 times / second, 18 times / second, 20 times / second, or any value between 10-20 times / second. A suitable dispensing speed facilitates uniform application of the glue on the brick surface and sufficient contact with the metal particles. If the dispensing speed is too fast, the glue may be unevenly applied, affecting the fixation of the metal particles; if the dispensing speed is too slow, production efficiency will be reduced.

[0075] The dispensing pressure should be between 0.2 and 0.5 MPa, for example, 0.2 MPa, 0.3 MPa, 0.4 MPa, 0.5 MPa, or any value between 0.2 and 0.5 MPa. Appropriate dispensing pressure allows the glue to be squeezed out and filled between the metal particles and the tile surface, enhancing the bonding strength between the metal particles and the tile surface. Excessive pressure may cause the glue to overflow, affecting the aesthetics of the pattern and the positioning accuracy of the particles. Excessive pressure may prevent the glue from fully filling the space, resulting in a loose fixation of the particles.

[0076] The dispenser's needle diameter should be selected based on the particle size and contour requirements of the metal pellets, preferably between 0.2 and 0.5 mm. The appropriate needle diameter ensures that the glue is accurately applied around the metal pellets, ensuring full contact between the pellets and the tile surface. A needle that is too large may result in glue waste and inaccurate positioning; a needle that is too small may prevent smooth glue flow and affect the fixation of the pellets.

[0077] When dispensing glue, maintain a distance of 2-5 mm between the needle tip and the surface of the ceramic tile. This distance ensures that the glue is evenly applied to the tile surface, preventing poor contact between the glue and the tile surface or glue splashing. Too much distance may prevent the glue from being accurately applied around the dry particles; too little distance may cause the needle tip to collide with the tile surface, damaging it or the tile surface, and also affecting the glue application effect.

[0078] B. The glue used in the dispensing machine is selected from epoxy resin AB glue, preferably bisphenol A epoxy resin, and preferably E-44 bisphenol A epoxy resin and E-51 bisphenol A epoxy resin.

[0079] Different glue types and grades may vary in terms of bonding performance, curing speed, and temperature resistance, which can affect the firmness of the dry particles. The epoxy resin in this application has good bonding performance, chemical resistance, and mechanical strength, and can provide good fixation for metal dry particles.

[0080] C. The dispensing machine is a double-liquid dispensing machine, and the glue used by the double-liquid dispensing machine includes glue A and glue B, and the glue A and the glue B are mixed in a mass ratio of 1:1 to 2:1.

[0081] The right mixing ratio can ensure the curing effect and bonding performance of the glue. If the mixing ratio is not right, it may cause the glue to not cure completely or the bonding performance to decrease, thus affecting the firmness of the dry particles.

[0082] D. The voltage of the electrostatic field is 10-30 kilovolts, the action time of the electrostatic field is 5-10 seconds, and the distance between the electrode applying the electrostatic field and the surface of the tile blank is 5-10 centimeters.

[0083] The voltage of the electrostatic field is 10-30 kilovolts. The higher the voltage, the stronger the electrostatic adsorption force, which will increase the bonding strength between the metal particles and the tile surface to a certain extent. However, excessively high voltage may cause some adverse effects, such as partial discharge during the adsorption process of the metal particles, affecting the uniformity and stability of adsorption, and may also have a certain impact on the electrical properties of the tile surface.

[0084] The action time of the electrostatic field is 5-10 seconds. Prolonging the action time appropriately can give the metal dry particles more time to be adsorbed on the tile surface, thereby improving the bonding strength. However, if the action time is further extended after the adsorption process reaches saturation, the bonding strength will not be further improved.

[0085] The distance between the electrode applying the electrostatic field and the surface of the tile is 5-10 cm. This appropriate distance ensures that the electrostatic field produces an appropriate electric field strength distribution on the tile surface, which is conducive to the uniform adsorption of the metal dry particles. If the distance is too close, the electric field strength may be uneven, affecting the uniformity of adsorption and the bonding strength. If the distance is too far, the electric field strength is weakened, which will reduce the adsorption force and bonding strength.

[0086] It should be noted that the physical properties of the ceramic tile, such as surface roughness, may also affect electrostatic adsorption. A rougher surface may cause the metal dry particles to be less firmly adsorbed. Therefore, before applying the electrostatic adsorption technology, the ceramic tile surface can be polished as needed.

[0087] In some embodiments, the viscosity of the glue used to print the glue pattern is 500-1000 centipoise;

[0088] And / or, the printing speed of the printed glue pattern is 10-20 m / min, and the amount of glue used is 10-20 g / m2;

[0089] And / or, the glue used for printing the glue pattern is an acrylate glue; preferably, the acrylate glue is one or both of epoxy-modified acrylate glue and polyurethane-modified acrylate glue.

[0090] In some embodiments, the step of donating glassy dry particles satisfies at least one of the following conditions:

[0091] a. The vitreous dry particles are barium-containing vitreous dry particles. The addition of barium can enhance the gloss and refractive index of the dry particles, while also improving their adhesion to the tile surface. This is because the barium ions react chemically with the components of the tile surface during firing, forming chemical bonds such as Ba-O, which enhance the bonding strength.

[0092] b. The vitreous dry particles are barium-containing vitreous dry particles, wherein the barium-containing vitreous dry particles comprise, by mass percentage, SiO2 55%-65%, BaO 15%-20%, Al2O3 10%-15% and Na2O 5%-10%;

[0093] Among them, SiO2 is one of the main components of glassy dry particles, providing the basic glassy structure for the dry particles; BaO provides barium element, which can improve gloss, refractive index and binding performance; Al2O3 helps to improve the hardness and chemical stability of the dry particles; Na2O can adjust the melting point and viscosity of glass, thereby affecting the processing and performance of the dry particles.

[0094] c. More than 80 wt% of the glassy dry particles have a particle size between 0.1 and 0.5 mm; a suitable particle size distribution can ensure uniform distribution of the dry particles on the tile surface, avoiding accumulation or vacancies of the glassy dry particles.

[0095] d. The Mohs hardness of the glassy dry particles is between 5 and 7, which is beneficial for improving the wear resistance of the enamel decoration.

[0096] e. The thermal expansion coefficient of the glassy dry particles is 50×10 -7 / ℃-80×10 -7 / ℃; similar to the thermal expansion coefficient of ceramic tiles, which helps to reduce the separation or cracking of dry particles from the ceramic tile surface due to temperature changes during firing and use.

[0097] f. The application rate of the glassy dry particles is 5-10 g / s; in some embodiments, the dry particles can be applied using a dry particle spreader.

[0098] The dispensing accuracy of the glassy dry particles is ±0.1 mm.

[0099] h. After applying the vitreous dry particles, a suction device is used to remove unbound vitreous dry particles; the suction force of the suction device is 10-20 Newtons, the nozzle diameter is 10-30 mm, and the action time is 5-10 seconds.

[0100] In some embodiments, the thickness of the base glaze is 0.1-0.3 mm; a suitable base glaze thickness can provide a good foundation for subsequent decorative layers. If the base glaze is too thick, it may cause defects such as bubbles during the firing process; if the base glaze is too thin, it cannot play a sufficient reinforcing and decorative foundation role.

[0101] In some embodiments, the viscosity of the base glaze tested on a No. 4 cup is 30-50 seconds and the specific gravity is 1.5-1.8 g / cm3. The appropriate viscosity can make the glaze evenly distributed on the surface of the tile, avoiding sagging or uneven thickness. If the viscosity is too high, the glaze will be difficult to spread evenly, which may cause the local thickness to be too large, affecting the firing effect and decorative effect; if the viscosity is too low, the glaze may not be able to form a coating of sufficient thickness on the surface of the tile, affecting the decorative effect and protective effect. At the same time, the specific gravity of the base glaze will also affect the viscosity of the base glaze and the uniformity of the glaze, so it needs to be selected reasonably.

[0102] As the base layer, the uniformity and thickness of the base glaze will affect the bonding strength with subsequent decorative layers (such as color pattern layer, dry particle layer, etc.). Base glaze with appropriate viscosity can better bond with subsequent decorative layers and enhance the stability of the overall decorative effect.

[0103] The uniformity of the base glaze will also affect the final decorative effects of the ceramic tile, such as glossiness and color saturation. Base glaze with appropriate viscosity can provide a better foundation for subsequent decoration and make the decorative effect more outstanding.

[0104] It should be noted that in this application, the specific method for testing the viscosity of the glaze using the Tu No. 4 cup is as follows: at room temperature (about 25°C), pour the glaze into the Tu No. 4 cup, let the glaze flow out naturally, and record the time required from the beginning of flow to the end of flow. This time is the viscosity value of the glaze (in seconds).

[0105] In some embodiments, the color pattern is printed using a digital inkjet printer with a resolution of 300-600 dpi and an ink viscosity of 10-20 centipoise. This produces a clear and precise pattern. The higher resolution, combined with properly adherent ink, allows the printed color pattern to exhibit more delicate color transitions and clearer line contours on the ceramic tile, thereby providing a better background and foundation for subsequent decoration.

[0106] The purpose of printing color patterns is to provide a background and foundation for subsequent decoration, and the ink color can be selected according to the needs of the color pattern.

[0107] In some embodiments, the mass concentration of the suspending agent in the suspended glaze slurry is 40-60%;

[0108] And / or, the spraying pressure is 0.3-0.5 MPa;

[0109] And / or, the thickness of the suspended glaze slurry is 0.2-0.4 mm.

[0110] The suspended glaze slurry includes a suspending agent and a transparent glaze (conventional raw materials of Foshan Oushennuo Ceramics Co., Ltd.). The suspending agent makes it difficult for moisture to penetrate into the interior of the tile blank and can wrap the dry particles on the surface of the tile blank; the transparent glaze and the dry particles cooperate with each other to present a preset texture and decorative effect after firing.

[0111] Enhancement Method: By controlling the concentration, pressure, and thickness of the sprayed suspended glaze slurry, the surface texture and decorative effect of the ceramic tile can be enhanced. Specifically, the glaze slurry is evenly distributed on the surface of the ceramic tile to form a fine glaze layer. This glaze layer improves the surface smoothness and brightness of the ceramic tile, and interacts with the applied dry particles to further enrich and enhance the decorative effect of the ceramic tile. Specifically:

[0112] (1) Improve surface smoothness. When the suspended glaze slurry is sprayed on the surface of ceramic tiles, its uniform distribution can fill the tiny pores and unevenness on the surface of the tiles, forming a relatively flat covering layer on the surface of the tiles, thereby improving the surface smoothness of the ceramic tiles.

[0113] (2) Improved brightness. The components in the suspended glaze slurry form a smooth surface structure after firing. On the one hand, the characteristics of the glaze slurry itself enable it to reflect more light, increasing the glossiness of the ceramic tile surface; on the other hand, the appropriate spraying parameters ensure the uniformity and density of the glaze layer, reduce the scattering and absorption of light on the surface, and further improve the brightness.

[0114] (3) Interaction with dry particles enhances the decorative effect, including the improvement of color richness, three-dimensional effect and durability of decorative effect.

[0115] Color Richness: The applied granules have different colors and lusters (barium-containing vitreous granules enhance gloss, and colored vitreous granules or vitreous granules with a metallic luster are also available). The suspended glaze slurry covering the granules not only protects them but also refracts and reflects light, making the colors more vivid and rich, enhancing the color depth of the ceramic tile.

[0116] Enhanced three-dimensional effect: The dry particles create a certain raised texture or texture on the surface of the ceramic tile, while the suspended glaze slurry fills the space between and around the dry particles, creating a three-dimensional decorative effect. The presence of the glaze slurry creates a more natural transition between the dry particles and the tile surface, while also highlighting the three-dimensional effect of the dry particles, making the decorative effect of the ceramic tile more vivid and realistic.

[0117] Durable decorative effect: The suspended glaze slurry can protect the dry particles from erosion by the external environment, such as moisture, dust, etc. At the same time, its good combination with the dry particles can also prevent the dry particles from falling off, thus ensuring the durability of the ceramic tile decorative effect.

[0118] In some embodiments, the firing temperature is 1100-1300°C, and the firing time is 30-60 minutes. The firing temperature can be 1100°C, 1150°C, 1200°C, 1250°C, 1300°C or any value between 1100-1300°C, and the firing time can be 30 minutes, 35 minutes, 40 minutes, 45 minutes, 50 minutes, 55 minutes, 60 minutes or any value between 30-60 minutes. Appropriate firing temperature and time can fully sinter the glaze and dry particles and firmly bond them to the tile matrix. If the temperature is too high or the time is too long, it may cause problems such as tile deformation and glaze cracking; if the temperature is too low or the time is too short, the glaze and dry particles may not be fully sintered, affecting the decorative effect and bonding strength.

[0119] (1) Changes in physical structure:

[0120] During the high-temperature firing process, the rising temperature gradually expels moisture from the brick, which helps increase the density and strength of the brick. Simultaneously, the temperature causes the minerals in the brick to crystallize and reorganize, making the ceramic tile more compact, thereby increasing its hardness and wear resistance, making it more suitable for use as a building decoration material. For the dry particles applied to the brick surface, high-temperature firing allows them to better integrate with the brick surface and glaze layer, potentially stabilizing their internal crystal structure and forming a stronger bond with the brick and glaze layer.

[0121] (2) Chemical changes: The chemical components in ceramic tiles will react at high temperatures.

[0122] Fluxes in ceramic tile blanks may lower firing temperatures, promoting the melting and fusion of other ingredients. Certain components in glazes, such as barium, may chemically react with the surface of the dry particles, strengthening the bond between the dry particles and the glaze. During firing, some metal oxides undergo redox reactions at high temperatures, changing color and enriching the color expression of the ceramic tile.

[0123] The method for preparing ceramic tiles with enamel decorative effects on the surface provided by the present application includes applying a base glaze, printing a color pattern, positioning metal dry particles, printing glue, applying glassy dry particles, spraying a suspended glaze slurry, and firing. Through the steps of positioning the metal dry particles and applying the glassy dry particles, the ceramic tiles present an enamel decorative effect with a strong sense of three-dimensionality and artistry, with rich colors and exquisite patterns, which can meet consumers' demand for high-end decorative materials. The production process of the preparation method of the present application is more stable and controllable, reducing the scrap rate, improving production efficiency, and reducing production costs; the entire process flow is rationally designed, and the various steps are closely connected. From applying the base glaze to firing, ceramic tiles with enamel decorative effects can be efficiently produced, thereby improving production efficiency.

[0124] The preparation method of the present application can achieve a good match between materials, and ensure a firm bond between the enamel decorative layer and the ceramic tile substrate by optimizing the formula of glaze and dry particles, and adjusting the process parameters; by introducing advanced technologies such as digital inkjet printing and electrostatic adsorption, it reduces dependence on complex handicrafts, reduces production costs, and simplifies the process flow; by selecting materials with strong weather resistance and good adhesion, and optimizing the firing process, it ensures that the decorative effect remains stable during long-term use, and improves the stability and durability of the decorative effect; the preparation method of the present application is suitable for enamel decoration on the surface of ceramic tiles, meeting the market demand for diversified and high-quality ceramic tile decoration.

[0125] The present application also provides a ceramic tile with an enamel decorative effect on the surface, which is prepared by the above-mentioned method for preparing a ceramic tile with an enamel decorative effect on the surface.

[0126] The ceramic tiles with enamel decorative effects on the surface of the present application can have a variety of choices. Different metal dry particles (such as aluminum powder, copper powder, iron powder, etc.) can be selected for positioning, and different types of glassy dry particles (barium-containing glassy dry particles, colored glassy dry particles, glassy dry particles with metallic luster, etc.) can be applied, providing designers and consumers with a wealth of decorative options to meet the needs of decoration in different styles; it also has good bonding properties: epoxy resin glue is used to position the metal dry particles, and acrylic glue provides an adhesion basis for applying the dry particles, ensuring that the dry particles are firmly attached to the surface of the ceramic tile blank and improving the durability of the product; high chemical corrosion resistance and mechanical strength: the epoxy resin glue and glassy dry particles in the present application have good chemical corrosion resistance and mechanical strength, so that the ceramic tiles can maintain good appearance and performance in various environments and are not easily damaged; good thermal stability: the carefully selected glassy dry particles have a suitable thermal expansion coefficient, and can stably adhere to the surface of the ceramic tile blank during the firing process, and are not prone to cracking, falling off, and other problems due to temperature changes.

[0127] The embodiments of the present application will be described in detail below in conjunction with specific examples, but it will be understood by those skilled in the art that the following examples are merely illustrative of the present application and should not be considered as limiting the scope of the present application. In the examples, if specific conditions are not specified, the conditions are carried out according to conventional conditions or manufacturer recommendations. The reagents or instruments used are not specified by the manufacturer and are conventional products that can be purchased commercially.

[0128] Example 1

[0129] Example 1 provides a method for preparing a ceramic tile having an enamel decorative effect on its surface, comprising the following steps:

[0130] S1 Base Glaze: Use a glazing machine to evenly apply base glaze to a smooth, defect-free surface of the tile blank. The base glaze thickness should be controlled at 0.2 mm. The glaze viscosity should be adjusted to 40 seconds (for a No. 4 cup) and the specific gravity should be 1.6 g / cm3.

[0131] S2 Printing color pattern: Place the tile blank on the workbench of the digital inkjet printer, select the appropriate ink color according to the design requirements, set the printer resolution to 450dpi, and the ink viscosity to 15 centipoise.

[0132] S3 Metal Dry Particle Positioning (Dual Liquid Dispensing Machine):

[0133] Prepare metal dry particles by mixing aluminum powder, copper powder, and iron powder in a mass ratio of 1:1:1, and control the particle size to be 0.3 mm.

[0134] Bisphenol A epoxy resins E-44 and E-51 were selected as glue A and glue B respectively, and were mixed in a mass ratio of 1.5:1 between glue A and glue B.

[0135] Load the mixed glue into the dispensing machine, set the dispensing speed to 15 times / second, the dispensing pressure to 0.35 MPa, the needle diameter to 0.35 mm, adjust the distance between the needle and the tile blank surface to 3.5 mm, and use the dispensing machine to position the metal dry particles on the tile blank to complete the image line outline.

[0136] S4 prints glue pattern: Use glue printing equipment to print glue pattern on the surface of tile blank. Use epoxy modified acrylate glue, control the glue viscosity to 750 centipoise, and print at a speed of 15 m / min.

[0137] S5 dry granules:

[0138] Barium-containing glassy dry particles were prepared, the chemical composition of which was SiO2: 60%, BaO: 18%, Al2O3: 12%, and Na2O: 10%.

[0139] Control the particle size distribution of dry particles to ensure that 85% of the dry particles are between 0.1-0.5 mm, with a Mohs hardness of 6 and a thermal expansion coefficient of 65×10 -7 / ℃.

[0140] Use a dispensing device to position and dispense dry particles at the location where the glue pattern is printed. The dispensing speed is 7.5 g / s and the dispensing accuracy is ±0.1 mm.

[0141] S6 sucks away unbonded dry particles: Use the suction device, set the suction force to 15 Newtons, the suction nozzle diameter to 20 mm, and the suction time to 8 seconds to suck away unbonded dry particles to ensure that the dry particles on the surface of the tile are evenly distributed and neat.

[0142] S7 Spraying suspended glaze slurry: Use suspended glaze slurry spraying equipment to spray suspended glaze slurry on the surface of the tile blank, control the concentration of the suspended glaze slurry to 50%, the spraying pressure to 0.4 MPa, and the spraying thickness to 0.3 mm.

[0143] S8 firing process: put the ceramic tile blank into the firing equipment for high temperature firing, the firing temperature is set to 1200℃, the firing time is 45 minutes, and the ceramic tile blank is obtained. Figure 1 Ceramic tile samples with enamel decorative effect on the surface.

[0144] The ceramic tiles prepared in Example 1 have the following advantages:

[0145] Rich and exquisite colors: The color pattern is printed by a digital inkjet printer with a resolution of 450dpi and an ink viscosity of 15 centipoise, which can present delicate color transitions and clear line contours, providing an exquisite background for subsequent decoration. Combined with the line contours outlined by the positioning of metal dry particles and the application of barium-containing glassy dry particles, the surface of the tile forms a rich sense of layering and three-dimensionality, with rich and varied colors and exquisite patterns. Figure 1 It can be seen that the decorative patterns on the surface of the tiles have a strong sense of art, and the combination of different colors and materials creates a unique visual effect.

[0146] Strong three-dimensional effect: the line contours formed by the positioning of metal dry particles and the applied glass dry particles form bulges or textures on the surface of the tiles, forming a certain height difference with the surface of the tiles, producing a shadow effect under the light, and enhancing the three-dimensional effect.

[0147] Strong and durable: Through optimized process and material selection, as well as appropriate firing process, the dry particles are firmly attached to the surface of the tile blank, so that the tile has high chemical corrosion resistance and mechanical strength, can maintain good appearance and performance in long-term use, and is not easily damaged.

[0148] Example 2

[0149] Example 2 provides a method for preparing a ceramic tile having an enamel decorative effect on its surface, comprising the following steps:

[0150] S1: Base glaze: same as in Example 1.

[0151] S2 printing color pattern: same as in Example 1.

[0152] S3 metal dry particle positioning (electrostatic adsorption technology):

[0153] Prepare metal dry particles as in Example 1.

[0154] An electrode is set near the surface of the tile blank, and the electrode is kept 8 cm away from the surface of the tile blank.

[0155] A 20 kV electrostatic field is applied for 8 seconds, causing the metal dry particles to be adsorbed at specific locations, completing the outline of the image lines.

[0156] S4 printing glue pattern: same as in Example 1.

[0157] S5: administering dry particles: same as in Example 1.

[0158] S6 sucks away the unbound dry particles: same as in Example 1.

[0159] S7 spraying the suspended glaze slurry: same as in Example 1.

[0160] S8 sintering treatment: same as Example 1, Figure 2 The sample of ceramic tiles shown has an enamel decorative effect on the surface.

[0161] Example 3

[0162] This embodiment provides a method for preparing a ceramic tile having an enamel decorative effect on its surface, comprising the following steps:

[0163] S1 Base Glaze: Use a glazing machine to evenly apply base glaze to a smooth, defect-free surface of the tile blank. The base glaze thickness is controlled at 0.15 mm. The glaze viscosity is adjusted to 35 seconds (for a No. 4 cup) and the specific gravity is 1.55 g / cm3.

[0164] S2 Printing color pattern: Place the ceramic tile blank on the workbench of the digital inkjet printer, select the appropriate ink color according to the design requirements, set the printer resolution to 500dpi, and the ink viscosity to 12 centipoise.

[0165] S3 Metal Dry Particle Positioning (Dispensing Machine)

[0166] Prepare metal dry particles, which are made by mixing aluminum powder and copper powder in a mass ratio of 2:1, and the particle size is controlled at 0.2 mm.

[0167] Use bisphenol A epoxy resin E-44 as glue, load the glue into the dispensing machine, set the dispensing speed to 12 times / second, the dispensing pressure to 0.3 MPa, the needle diameter to 0.3 mm, adjust the distance between the needle and the tile surface to 3 mm, and use the dispensing machine to position the metal dry particles on the tile to complete the image line outline.

[0168] S4 prints glue pattern: Use glue printing equipment to print glue pattern on the surface of tile blank. Use polyurethane modified acrylate glue, control the glue viscosity to 600 centipoise, and print at a speed of 12 m / min.

[0169] S5 dry granules

[0170] Barium-containing glassy dry particles were prepared, the chemical composition (mass percentage) of which was: SiO2: 62%, BaO: 16%, Al2O3: 13%, and Na2O: 9%.

[0171] The particle size distribution of the dry particles is controlled to ensure that 82% of the dry particles are between 0.1 and 0.5 mm in size, with a Mohs hardness of 5.5 and a thermal expansion coefficient of 70×10-7 / °C.

[0172] Use a dispensing device to position and dispense dry particles at the location where the glue pattern is printed. The dispensing speed is 6 g / s and the dispensing accuracy is ±0.1 mm.

[0173] S6 sucks away unbonded dry particles: Use the suction device, set the suction force to 12 Newtons, the nozzle diameter to 15 mm, and the suction time to 6 seconds to suck away unbonded dry particles to ensure that the dry particles on the surface of the tile are evenly distributed and neat.

[0174] S7 Spraying suspended glaze slurry: Use suspended glaze slurry spraying equipment to spray suspended glaze slurry on the surface of the tile blank, control the concentration of the suspended glaze slurry to 45%, the spraying pressure to 0.35 MPa, and the spraying thickness to 0.25 mm.

[0175] S8 firing treatment: Place the ceramic tile blank into the firing equipment for high-temperature firing. The firing temperature is set to 1150°C and the firing time is 40 minutes to obtain a ceramic tile sample with an enamel decorative effect on the surface.

[0176] Comparative Example 1 (Irrational selection of metal dry particles)

[0177] This comparative example provides a method for preparing a ceramic tile having an enamel decorative effect on the surface. The main difference from Example 1 is that the metal dry particles are different. The metal dry particles are pure silver powder, and the particle size is also controlled at 0.3 mm.

[0178] Comparative Example 2 (Dispensing Machine Parameters Are Unreasonable)

[0179] This comparative example provides a method for preparing ceramic tiles with enamel-decorated surfaces. The method differs from Example 1 primarily in the parameter settings of the glue dispenser. In Comparative Example 2, the glue dispensing speed is 5 times / second, the glue dispensing pressure is 0.1 MPa, the needle diameter is 0.2 mm, and the distance between the needle and the tile surface is 1 mm.

[0180] Comparative Example 3 (firing temperature is unreasonable)

[0181] This comparative example provides a method for preparing a ceramic tile having an enamel decorative effect on its surface, which differs from Example 1 mainly in the firing temperature. In Comparative Example 3, the firing temperature is set to 900° C. and the firing time is 45 minutes.

[0182] The performance of the ceramic tiles with enamel decorative effects on the surface prepared in the above embodiments and comparative examples was tested. The specific testing method is as follows:

[0183] Peel test: This method measures the force required to gradually peel the interface between the enamel layer and the tile substrate. Standard: ASTM D903-2017, "Standard Test Method for Peel or Stripping Strength of Adhesive Bonds."

[0184] Bending test: Tests bond strength by applying bending stress. Standard: GB / T 4100-2015 "Ceramic Tiles," Appendix C "Bending Strength Test Method for Ceramic Tiles."

[0185] Thermal shock resistance test: The ceramic tile is heated and rapidly cooled between 145°C ± 5°C and 15°C ± 5°C, repeated 10 times, and the sample is inspected for damage. Standard: GB / T 3810.9-2016, "Test methods for ceramic tiles - Part 9: Determination of thermal shock resistance."

[0186] Accelerated aging test: simulates the effects of environmental factors that ceramic tiles may encounter during long-term use on their performance. Standard: GB / T 1865-2009 "Paints and varnishes - Artificial weathering and exposure to artificial radiation (filtered xenon arc radiation)"

[0187] Decorative layer adhesion (cross-cut test): Evaluates the adhesion between the enamel decorative layer and the tile substrate. Standard: GB / T 9286-1998, Paint and varnish film cross-cut test.

[0188] The test results are shown in Table 1.

[0189] Table 1

[0190]

[0191]

[0192] Examples 1-3

[0193] The metal dry particles are reasonably selected: a mixture of aluminum powder, copper powder and iron powder is used. These materials not only provide good gloss, but also have excellent adhesion and durability.

[0194] Optimization of dispensing parameters: By adjusting the dispensing speed, pressure, needle diameter and the distance between the needle and the tile surface, the uniform application of glue and the firm adhesion of dry particles are ensured.

[0195] Appropriate firing temperature: The optimized firing temperature is used to fully sinter the glaze and dry particles, thereby enhancing the bonding between them.

[0196] The test results were excellent: the product performed well in the peel test, bending test, thermal shock resistance test and decorative layer adhesion test, with each index being 2, indicating that the decorative effect is very durable and stable.

[0197] Comparative Example 1: Unreasonable selection of metal dry particles

[0198] Although silver powder has a high gloss, its adhesion and durability are poor and it easily falls off during use, affecting the durability of the decorative effect. In contrast, the mixture of aluminum powder, copper powder and iron powder used in Example 1 has better adhesion and durability.

[0199] Comparative Example 2 (Dispensing Machine Parameters Are Unreasonable)

[0200] Slow dispensing speed, low pressure, small needle diameter, and close distance between the needle and the tile surface resulted in uneven glue application and weak fixation of the dry particles. In contrast, the optimized dispensing parameters in Example 1 ensured strong adhesion of the dry particles and a durable decorative effect.

[0201] Comparative Example 3 (firing temperature is unreasonable)

[0202] Firing temperature that is too low results in insufficient sintering of the glaze and dry particles, resulting in weak bonding and easy detachment during use. In contrast, the optimized firing temperature in Example 1 ensures sufficient sintering and firm bonding of the glaze and dry particles, improving the durability and stability of the decorative effect.

[0203] An analysis of Comparative Examples 1, 2, and 3, combined with the results of Examples 1, 2, and 3, shows that the selection of dry metal particles, the dispensing machine and electrostatic adsorption parameter settings, and the firing temperature significantly affect the decorative effect and durability of the tiles. The optimized materials and process parameters in Example 1 ensure the high quality and durability of the enamel decorative effect on the tile surface, demonstrating the advantages of the technical solution of this application.

[0204] 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 them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

[0205] Furthermore, those skilled in the art will appreciate that although some embodiments herein include certain features included in other embodiments but not others, combinations of features from different embodiments are intended to be within the scope of this application and to form distinct embodiments. For example, in the claims above, any of the claimed embodiments may be used in any combination. The information disclosed in this background section is intended solely to enhance understanding of the overall background of this application and should not be construed as an admission or any implication that such information constitutes prior art known to those skilled in the art.

Claims

1. A method for preparing a ceramic tile having an enamel decorative effect on the surface, characterized in that: include: Apply base glaze and print color patterns on the surface of the tile blank in sequence; Positioning metal dry particles on the ceramic tile blank formed with the color pattern to obtain the outline of the image lines outlined by the metal dry particles; the metal dry particles include one or more of aluminum powder, copper powder, and iron powder; Printing a glue pattern, applying glassy dry particles, and spraying a suspended glaze slurry on the surface of the tile blank formed with the image line contour in sequence; the glassy dry particles are barium-containing glassy dry particles, and the barium-containing glassy dry particles include, by mass percentage, SiO2 55%-65%, BaO 15%-20%, Al2O3 10%-15%, and Na2O 5%-10%; The ceramic tile blanks sprayed with the suspended glaze slurry are fired at a temperature of 1100-1300° C. to obtain ceramic tiles with enamel decorative effects on the surface; The metal dry particles are positioned by dispensing glue using a glue dispenser. The dispensing speed of the glue dispenser is 10-20 times per second, the dispensing pressure is 0.2-0.5 MPa, the needle diameter of the glue dispenser is 0.2-0.5 mm, and the distance between the needle and the surface of the tile blank is maintained at 2-5 mm. The glue used by the glue dispenser is selected from bisphenol A type epoxy resin. The glue dispenser is a two-liquid glue dispenser, and the glue used by the two-liquid glue dispenser includes glue A and glue B, and the glue A and glue B are mixed in a mass ratio of 1:1 to 2:

1. Alternatively, the metal dry particles are positioned by electrostatic adsorption by applying an electrostatic field on the surface of the ceramic tile blank, the voltage of the electrostatic field is 10-30 kilovolts, the action time of the electrostatic field is 5-10 seconds, and the distance between the electrode applying the electrostatic field and the surface of the ceramic tile blank is 5-10 centimeters.

2. The method for preparing a ceramic tile having an enamel decorative effect on the surface according to claim 1, characterized in that: The particle size of the metal dry particles is 0.1-0.5 mm.

3. The method for preparing a ceramic tile having an enamel decorative effect on the surface according to claim 1, characterized in that: The viscosity of the glue used for printing the glue pattern is 500-1000 centipoise; and / or, the printing speed of the printed glue pattern is 10-20 m / min; And / or, the glue used for printing the glue pattern is acrylic glue.

4. The method for preparing a ceramic tile having an enamel decorative effect on the surface according to claim 3, characterized in that: The acrylic ester glue is one or both of epoxy modified acrylic ester glue and polyurethane modified acrylic ester glue.

5. The method for preparing a ceramic tile having an enamel decorative effect on the surface according to claim 1, characterized in that: The step of providing glassy dry particles satisfies at least one of the following conditions: a. The glassy dry particles have a particle size of more than 80wt% of the particles between 0.1 - 0.5 mm; b. The Mohs hardness of the glassy dry particles is between 5 and 7; c. The thermal expansion coefficient of the glassy dry particles is 50×10 -7 / ℃-80×10 -7 / ℃; d. The glassy dry particles are applied at a rate of 5-10 g / s; e. The accuracy of the glassy dry particles is ± 0.1 mm; f. After applying the vitreous dry particles, a suction device is used to remove the unbound vitreous dry particles; the suction force of the suction device is 10-20 Newtons, the nozzle diameter is 10 - 30 mm, and the action time is 5-10 seconds.

6. The method for preparing a ceramic tile having an enamel decorative effect on the surface according to claim 1, characterized in that: The thickness of the bottom glaze is 0.1-0.3 mm; And / or, coating No. 4 cup test the bottom glaze viscosity of 30-50 seconds, a specific gravity of 1.5-1.8 g / cubic centimeter; And / or, the color pattern is printed by a digital inkjet printer, the resolution of the digital inkjet printer is 300-600 dpi, and the viscosity of the ink is 10-20 centipoise.

7. The method for preparing a ceramic tile having an enamel decorative effect on the surface according to claim 1, characterized in that: The mass concentration of the suspending agent in the suspended glaze slurry is 40-60%; And / or, the spraying pressure is 0.3-0.5 MPa; And / or, the thickness of the suspended glaze slurry is 0.2-0.4 mm.

8. The method for preparing a ceramic tile having an enamel decorative effect on the surface according to claim 1, characterized in that: The firing time is 30-60 minutes.

9. A ceramic tile with enamel decorative effect on the surface, characterized in that: The ceramic tile with enamel decorative effect on the surface is prepared by the preparation method of any one of claims 1 to 8.

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