Double-sided decorative ceramic rock plate and preparation method thereof

Abstract

The application discloses a double-sided decorative ceramic rock plate and a preparation method thereof. The double-sided decorative ceramic rock plate comprises, from bottom to top, a back micro-powder decoration layer, an intermediate body layer, a bottom glaze layer, a pattern decoration layer and a glaze layer. The back micro-powder decoration layer is formed by arranging micro-powder of several colors to form a predetermined back pattern. The intermediate body layer is formed by arranging body powder of several colors to form a predetermined body pattern, and the body powder comprises color powder and basic body material. The micro-powder and the color powder have the same raw material components. The back micro-powder decoration layer, the pattern decoration layer and the glaze layer are arranged on the front and back surfaces of the intermediate body layer to realize the double-sided decoration effect of one-time firing. During the forming, the front surface is arranged with the back surface being arranged with micro-powder, and the positive pressure forming is adopted, and the overturning process is used, so that the pattern decoration on the bottom surface also has a fine and delicate effect. During polishing, the up-down polishing process is adopted, so that the ceramic rock plate has double-sided high gloss and good decoration effect.

Description

Technical Field

[0001] This invention belongs to the field of architectural ceramics technology, specifically relating to a double-sided decorative ceramic slab and its preparation method. Background Technology

[0002] Sintered stone slabs, as a new type of building material, are arguably the most popular product in the ceramics industry today, widely used in interior design. Their appearance resembles natural stone, and their unique patterns and textures effectively enhance the overall aesthetic. As an environmentally friendly and healthy food-grade material, sintered stone slabs are characterized by zero permeability, acid and alkali resistance, and wear resistance. They are also fireproof and heat-resistant, and these inherent advantages make them a standout among decorative materials.

[0003] Meanwhile, sintered stone, with its superior stain resistance, easy cleaning, corrosion resistance, and acid and alkali resistance, is widely used as a decorative material for bathroom cabinets, kitchen cabinets, and washbasins, including countertops, cabinet surfaces, and door panels. Sintered stone bathroom cabinets have high market acceptance and are gradually becoming the mainstream consumer product. Currently, most ceramic sintered stone on the market is single-sided, meaning that the interior of the cabinet lacks decorative effect after processing, significantly affecting its aesthetics. To solve this problem, many double-sided decorative sintered stone panels use composite decorative panels made of other materials, such as wood panels and aluminum composite panels, but this composite method is costly. Chinese invention patent CN111152334A discloses a double-sided decorative ceramic slab and its preparation method. This ceramic slab uses a two-stage firing process and has double-sided glaze decoration. However, the two-stage firing process is not only costly but also affects the mechanical properties of the entire tile, and the color effect of the pattern fired in the first stage is also affected to some extent during the second firing.

[0004] Therefore, there is an urgent need to develop a ceramic slab that can achieve double-sided decorative effect through a single firing without affecting the overall performance and decorative effect of the slab. Summary of the Invention

[0005] This invention addresses two technical problems in single-fired double-sided decorative ceramic slabs: firstly, it is difficult to achieve delicate patterns on the bottom surface; and secondly, the bottom surface is difficult to machine. The invention proposes a double-sided decorative ceramic slab and its preparation method, resulting in a ceramic slab with excellent double-sided decorative effects and superior processing performance.

[0006] To solve the above-mentioned technical problems, the first aspect of the present invention provides a double-sided decorative ceramic slab, which includes, from bottom to top, a back micro-powder decorative layer, an intermediate body layer, a base glaze layer, a pattern decorative layer, and a polished glaze layer;

[0007] The backing micro-powder decorative layer is formed by a predetermined backing pattern made of micro-powder of several colors.

[0008] The intermediate blank layer is formed by arranging blank powder of several colors to form a predetermined blank pattern, and the blank powder includes color powder and basic blank material;

[0009] The micro powder has the same raw material composition as the color powder.

[0010] Specifically, this invention achieves a double-sided decorative effect by setting a back-side micro-powder decorative layer, a pattern decorative layer, and a polished glaze layer on both sides of the intermediate body layer. Specifically, the bottom surface uses colored micro-powder fabric to form the back-side pattern, the intermediate body layer uses colored body powder, and the surface pattern is formed by inkjet printing and polishing, achieving a double-sided decorative effect in a single firing. Furthermore, this invention uses micro-powder and color powder with the same raw material composition in both the back-side micro-powder decorative layer and the intermediate body layer. This not only enhances the bonding performance between the back-side micro-powder decorative layer and the intermediate body layer, improving the product's processing performance, but also creates a through-body structure effect, making the pattern transitions between layers more natural and smooth.

[0011] As a further improvement to the above solution, the color powder includes a base blank and a colorant, with the colorant accounting for 3-5% of the mass of the color powder. Meanwhile, the content of color powder in the blank is determined by the pattern color of the intermediate blank layer.

[0012] As a further improvement to the above scheme, the chemical composition of the base blank, by weight percentage, includes: 65-70% SiO2, 15-20% Al2O3, 0.5-1.5% Fe2O3, 0.1-0.3% TiO2, 0.1-0.3% CaO, 0.3-0.5% MgO, 2-5% K2O, 1-3% Na2O and 4-6% loss on ignition.

[0013] As a further improvement to the above scheme, the thickness of the backing micro-powder decorative layer accounts for 10-15% of the total thickness of the double-sided decorative ceramic slab.

[0014] As a further improvement to the above scheme, the fineness of the micro powder is less than that of the color powder, and the fineness of the micro powder is less than 250 mesh.

[0015] As a further improvement to the above scheme, the thickness of the polished glaze layer is 0.5-0.8 mm.

[0016] Specifically, because the fineness of the powder in the backing micro-powder decorative layer is finer than that of the powder in the intermediate body layer, the shrinkage of the backing micro-powder decorative layer is greater during drying and firing cooling, which will lead to convex deformation defects in the ceramic slab. Therefore, this invention appropriately increases the thickness of the polished glaze layer to create greater tensile stress on the glaze surface, thereby balancing the deformation of the backing micro-powder decorative layer.

[0017] As a further improvement to the above scheme, the base glaze layer is formed by firing a base glaze, and the chemical composition of the base glaze, by weight percentage, includes: 65-70% SiO2, 20-25% Al2O3, 0.1-0.3% Fe2O3, 0.1-0.3% TiO2, 1-3% CaO, 1-3% MgO, 2-5% K2O, 1-3% Na2O, 0.5-1% ZrO2, 0.01-0.03% ZnO and 1-3% loss on ignition.

[0018] As a further improvement to the above scheme, the polished glaze layer is formed by polishing and firing, and the chemical composition of the polished glaze, by weight percentage, includes: 48-51% SiO2, 15-18% Al2O3, 0.1-0.3% Fe2O3, 0.05-0.1% TiO2, 8-12% CaO, 3-5% MgO, 3-5% K2O, 1-3% Na2O, 8-10% ZnO and 4-6% loss on ignition.

[0019] As a further improvement to the above solution, the difference between the coefficient of thermal expansion of the polished glaze and the coefficient of thermal expansion of the micro-powder is less than 1.2 × 10⁻⁶ within the range of room temperature to 200°C. -6 ℃ -1 By reducing the difference in the coefficients of thermal expansion between glaze and micro-powder, the expansion and contraction patterns of the bottom surface and the glaze surface become similar, which is beneficial to improving the cutting and processing performance of the whole brick.

[0020] A second aspect of the present invention provides a method for preparing the above-mentioned double-sided decorative ceramic slab, comprising the following steps:

[0021] (1) Divide the base blank into several parts and mix them with different colored pigments to obtain different colored powders; then mix the different colored powders with the base blank to obtain different colored blank powders.

[0022] (2) The different colored powders obtained in step (1) are crushed and ground into powder to obtain micro powders of different colors.

[0023] (3) Apply the different colored blank powders obtained in step (1) to the mold according to the predetermined blank pattern, scrape it flat, continue to apply the different colored micro powders obtained in step (2) according to the back and bottom pattern, press and shape, and obtain the back and bottom micro powder decorative layer and the middle blank layer.

[0024] (4) Apply a base glaze, print a pattern by inkjet printing, and apply a polishing glaze to the surface of the intermediate body layer obtained in step (3) in sequence to form a base glaze layer, a pattern decoration layer and a polishing glaze layer in sequence; then brush a base slurry on the surface of the back micro powder decoration layer, dry it and fire it in a kiln to obtain a semi-finished ceramic slab.

[0025] (5) After grinding the edges and polishing the glaze layer of the semi-finished ceramic rock slab obtained in step (4), the brick body is turned over; then the back micro powder decorative layer is polished, waxed to prevent stains and coated with film in sequence, and the brick body is turned over again; finally, the glaze layer is waxed to prevent stains and coated with film to obtain the double-sided decorative ceramic rock slab.

[0026] Specifically, the double-sided decorative ceramic slab of this invention employs a front-side material application and reverse micro-powdering process during molding. This involves first applying a large amount of raw powder, then applying the micro-powder pattern; positive pressure molding, combined with a flipping process, maximizes the presentation of the micro-powder pattern texture, ensuring the bottom surface decoration also achieves a realistic and delicate effect. Simultaneously, sufficient friction between the bottom surface and the polishing platform is required to prevent the ceramic slab from shifting during polishing. Before polishing, the glazed surface is relatively smooth, resulting in less friction with the polishing platform. However, the bottom surface of the ceramic slab, due to the presence of base slurry powder, is relatively rough, leading to greater friction with the polishing surface. Therefore, in the polishing process of ceramic slabs, the present invention first polishes and polishes the glazed surface without applying anti-fouling wax. At this time, the glazed surface has a large number of polishing micropores, which will form a suction cup effect with the polishing platform under the action of polishing water, resulting in greater friction. Then, the ceramic slab is flipped over, and the bottom surface is polished, waxed for anti-fouling, and coated with a film. Finally, the ceramic slab is flipped over again, and the polished glazed surface is waxed for anti-fouling. This achieves double-sided polishing and waxing of the ceramic slab, resulting in a ceramic slab with high gloss on both sides and excellent decorative effect.

[0027] As a further improvement to the above scheme, in step (4), the firing temperature is 1180-1230℃ and the firing cycle is 55-65min.

[0028] Preferably, in step (4), the specific gravity of the base glaze is 1.85-1.95 g / cm³. 3 The fineness of the base glaze is 0.4-0.7 wt% residue on a 325-mesh sieve.

[0029] Preferably, in step (4), the specific gravity of the glaze is 1.88-1.94 g / cm³. 3 The fineness of the polished glaze is 0.7-1.0 wt% residue on a 325-mesh sieve, and the glaze application rate is 1500-2500 g / m². 2 .

[0030] Preferably, in step (4), the base slurry is a magnesium oxide slurry, and the solid content of the magnesium oxide slurry is 5-10 wt%.

[0031] Compared with the prior art, the above-described technical solution of the present invention has at least the following technical effects or advantages:

[0032] (1) This invention achieves a double-sided decorative effect in a single firing by setting a back micro-powder decorative layer, a pattern decorative layer, and a polished glaze layer on both sides of the intermediate body layer. At the same time, the use of micro-powder and color powder with the same raw material composition enhances the bonding performance between the back micro-powder decorative layer and the intermediate body layer, improves the processing performance of the product, and makes the pattern transition between layers more natural and smooth.

[0033] (2) In the molding process of the double-sided decorative ceramic slab of the present invention, a front-side fabrication and reverse micro-powdering process is adopted, along with positive pressure molding and a flipping process, to maximize the presentation of the micro-powder pattern texture, so that the pattern decoration on the bottom surface also has a realistic and delicate effect. At the same time, during polishing, an upper and lower polishing process is adopted, utilizing the suction cup effect of the polishing microporous structure and the effect of the bottom slurry to increase friction, thereby achieving double-sided polishing and waxing, resulting in a ceramic slab with high gloss on both sides and excellent decorative effect. Detailed Implementation

[0034] The present invention will now be described in detail with reference to embodiments to facilitate understanding of the invention by those skilled in the art. It is particularly important to note that the embodiments are merely illustrative of the invention and should not be construed as limiting the scope of protection of the invention. Non-essential improvements and adjustments made to the invention by those skilled in the art based on the above description should still fall within the scope of protection of the invention. Furthermore, all raw materials mentioned below, unless otherwise specified, are commercially available products; all process steps or preparation methods not mentioned in detail are process steps or preparation methods known to those skilled in the art.

[0035] The chemical compositions of the base material, base glaze, and polishing glaze used in the following embodiments are as follows:

[0036] The chemical composition of the base billet by weight percentage is: 68.45% SiO2, 19.24% Al2O3, 1.10% Fe2O3, 0.14% TiO2, 0.20% CaO, 0.45% MgO, 3.38% K2O, 2.21% Na2O and 4.83% loss on ignition.

[0037] The chemical composition of the base glaze, by weight percentage, is: 66.57% SiO2, 23.51% Al2O3, 0.21% Fe2O3, 0.20% TiO2, 1.04% CaO, 1.54% MgO, 3.88% K2O, 1.15% Na2O, 0.62% ZrO2, 0.01% ZnO and 1.27% loss on ignition.

[0038] The chemical composition of the polished glaze, by weight percentage, is: 49.73% SiO2, 16.52% Al2O3, 0.12% Fe2O3, 0.06% TiO2, 10.12% CaO, 3.56% MgO, 3.69% K2O, 1.92% Na2O, 9.32% ZnO and 4.96% loss on ignition.

[0039] Example 1

[0040] A double-sided decorative ceramic slab comprises, from bottom to top, a backing micro-powder decorative layer, an intermediate body layer, a base glaze layer, a pattern decorative layer, and a polished glaze layer; wherein the thickness of the double-sided decorative ceramic slab is 11.5 mm, the thickness of the backing micro-powder decorative layer is 1.2 mm, and the thickness of the polished glaze layer is 0.5 mm.

[0041] The backing micro-powder decorative layer is formed by micro-powder of three colors (pigments include blue, yellow, and brown) to create a predetermined backing pattern; the middle blank layer is formed by blank powder of three colors (pigments include blue, yellow, and brown) to create a predetermined blank pattern, and the blank powder includes pigment powder (accounting for 5% of the total blank powder) and base blank; the raw material composition of the micro-powder and pigment powder is the same, the pigment powder includes base blank and pigment, and the pigment accounts for 3% of the total mass of the pigment powder.

[0042] The coefficient of thermal expansion of the glazed layer and the micro-powder decorative layer on the backing are both less than 0.8 × 10⁻⁶ within the range of room temperature to 200°C. -6 ℃ -1 .

[0043] A method for preparing a double-sided decorative ceramic slab includes the following steps:

[0044] (1) Weigh the raw materials for preparing the basic blank according to the mass ratio, and obtain the basic blank by ball milling, spray granulation and aging; then take a part of the basic blank, divide it into 3 equal parts, and mix it with different colored pigments respectively, and obtain several parts of different colored pigments by ball milling, spray granulation and aging; finally, mix the different colored pigments with the basic blank according to the mass ratio to obtain the blank powder of different colors.

[0045] (2) The different colored powders obtained in step (1) are crushed and ground into powder, and then passed through a 250-mesh sieve to obtain micro powders of different colors.

[0046] (3) Apply the different colored blank powders obtained in step (1) to the mold according to the predetermined blank pattern, scrape it flat, and then apply the different colored micro powders obtained in step (2) according to the back pattern through a digital fabrication machine, press it into shape, and obtain the back micro powder decorative layer and the middle blank layer.

[0047] (4) Apply a base glaze (specific gravity 1.85 g / cm³) sequentially to the surface of the intermediate body layer obtained in step (3). 3Fineness (0.7wt% residue on 325-mesh sieve), inkjet printed patterns, and polished glaze (specific gravity 1.90 g / cm³). 3 Fineness: 0.7% wt% residue on 325 mesh sieve; Glaze application: 1750 g / m² 2 The process involves sequentially forming a base glaze layer, a decorative pattern layer, and a polished glaze layer; then, a magnesium oxide base slurry with a solid content of 5wt% is brushed onto the surface of the back micro-powder decorative layer. After drying, the slurry is fired in a kiln at a maximum temperature of 1200℃ for 55 minutes to obtain a semi-finished ceramic slab.

[0048] (5) After grinding the edges and polishing the glaze layer of the semi-finished ceramic rock slab obtained in step (4), the brick body is turned over; then the back micro powder decorative layer is polished, waxed for stain prevention and film is applied in sequence, and the brick body is turned over; then the glaze layer is waxed for stain prevention and film is applied to obtain the double-sided decorative ceramic rock slab of this embodiment.

[0049] Example 2

[0050] A double-sided decorative ceramic slab comprises, from bottom to top, a backing micro-powder decorative layer, an intermediate body layer, a base glaze layer, a pattern decorative layer, and a polished glaze layer; wherein the thickness of the double-sided decorative ceramic slab is 12mm, the thickness of the backing micro-powder decorative layer is 1.4mm, and the thickness of the polished glaze layer is 0.6mm.

[0051] The backing micro-powder decorative layer is formed by two colors of micro-powder (including blue and yellow pigments) to create a predetermined backing pattern; the middle blank layer is formed by two colors of blank powder (including blue and yellow pigments) to create a predetermined blank pattern, and the blank powder includes pigment powder (accounting for 5% of the total blank powder) and basic blank material; the raw material composition of the micro-powder and pigment powder is the same, the pigment powder includes basic blank material and pigment, and the pigment accounts for 4% of the total mass of the pigment powder.

[0052] The coefficient of thermal expansion of the glazed layer and the micro-powder decorative layer on the backing are both less than 0.8 × 10⁻⁶ within the range of room temperature to 200°C. -6 ℃ -1 .

[0053] A method for preparing a double-sided decorative ceramic slab includes the following steps:

[0054] (1) Weigh the raw materials for preparing the basic blank according to the mass ratio, and obtain the basic blank by ball milling, spray granulation and aging; then take a part of the basic blank, divide it into 2 equal parts, and mix it with different colored pigments respectively, and obtain several parts of different colored powders by ball milling, spray granulation and aging; finally, mix the different colored powders with the basic blanks according to the mass ratio to obtain blank powders of different colors.

[0055] (2) The different colored powders obtained in step (1) are crushed and ground into powder, and then passed through a 250-mesh sieve to obtain micro powders of different colors.

[0056] (3) Apply the different colored blank powders obtained in step (1) to the mold according to the predetermined blank pattern, scrape it flat, and then apply the different colored micro powders obtained in step (2) according to the back pattern through a digital fabrication machine, press it into shape, and obtain the back micro powder decorative layer and the middle blank layer.

[0057] (4) Apply a base glaze (specific gravity 1.85 g / cm³) sequentially to the surface of the intermediate body layer obtained in step (3). 3 Fineness (0.7% residue on 325-mesh sieve), inkjet printed patterns, and polished glaze (specific gravity 1.90 g / cm³). 3 Fineness: 0.7% wt% residue on 325 mesh sieve; Glaze application weight: 2150 g / m² 2 The process involves sequentially forming a base glaze layer, a patterned decorative layer, and a polished glaze layer; then, a magnesium oxide base slurry with a solid content of 5wt% is brushed onto the surface of the back micro-powder decorative layer, and after drying, it is fired in a kiln at a maximum temperature of 1210℃ for a firing cycle of 65 minutes to obtain a semi-finished ceramic slab.

[0058] (5) After grinding the edges and polishing the glaze layer of the semi-finished ceramic rock slab obtained in step (4), the brick body is turned over; then the back micro powder decorative layer is polished, waxed for stain prevention and film is applied in sequence, and the brick body is turned over; then the glaze layer is waxed for stain prevention and film is applied to obtain the double-sided decorative ceramic rock slab of this embodiment.

[0059] Example 3

[0060] A double-sided decorative ceramic slab comprises, from bottom to top, a backing micro-powder decorative layer, an intermediate body layer, a base glaze layer, a pattern decorative layer, and a polished glaze layer; wherein the thickness of the double-sided decorative ceramic slab is 12.5 mm, the thickness of the backing micro-powder decorative layer is 1.6 mm, and the thickness of the polished glaze layer is 0.8 mm.

[0061] The backing micro-powder decorative layer is formed by two colors of micro-powder (including yellow and brown pigments) to create a predetermined backing pattern; the middle blank layer is formed by two colors of blank powder (including yellow and brown pigments) to create a predetermined blank pattern, and the blank powder includes pigment powder (accounting for 5% of the total blank powder) and base blank material; the raw material composition of the micro-powder and pigment powder is the same, the pigment powder includes base blank material and pigment, and the pigment accounts for 5% of the total mass of pigment powder.

[0062] The coefficient of thermal expansion of the glazed layer and the micro-powder decorative layer on the backing are both less than 0.8 × 10⁻⁶ within the range of room temperature to 200°C. -6 ℃ -1 .

[0063] A method for preparing a double-sided decorative ceramic slab includes the following steps:

[0064] (1) Weigh the raw materials for preparing the basic blank according to the mass ratio, and obtain the basic blank by ball milling, spray granulation and aging; then take a part of the basic blank, divide it into 2 equal parts, and mix it with different colored pigments respectively, and obtain several parts of different colored powders by ball milling, spray granulation and aging; finally, mix the different colored powders with the basic blanks according to the mass ratio to obtain blank powders of different colors.

[0065] (2) The different colored powders obtained in step (1) are crushed and ground into powder, and then passed through a 250-mesh sieve to obtain micro powders of different colors.

[0066] (3) Apply the different colored blank powders obtained in step (1) to the mold according to the predetermined blank pattern, scrape it flat, and then apply the different colored micro powders obtained in step (2) according to the back pattern through a digital fabrication machine, press it into shape, and obtain the back micro powder decorative layer and the middle blank layer.

[0067] (4) Apply a base glaze (specific gravity 1.85 g / cm³) sequentially to the surface of the intermediate body layer obtained in step (3). 3 Fineness (0.7% residue on 325-mesh sieve), inkjet printed patterns, and polished glaze (specific gravity 1.90 g / cm³). 3 Fineness: 0.7% wt% residue on 325 mesh sieve; Glaze application: 2300 g / m² 2 The process involves sequentially forming a base glaze layer, a decorative pattern layer, and a polished glaze layer; then, a magnesium oxide base slurry with a solid content of 5wt% is brushed onto the surface of the back micro-powder decorative layer. After drying, the slurry is fired in a kiln at a maximum temperature of 1180℃ for 60 minutes to obtain a semi-finished ceramic slab.

[0068] (5) After grinding the edges and polishing the glaze layer of the semi-finished ceramic rock slab obtained in step (4), the brick body is turned over; then the back micro powder decorative layer is polished, waxed for stain prevention and film is applied in sequence, and the brick body is turned over; then the glaze layer is waxed for stain prevention and film is applied to obtain the double-sided decorative ceramic rock slab of this embodiment.

[0069] Comparative Example 1

[0070] The only difference between Comparative Example 1 and Example 1 is that the raw material composition of the micro powder in Comparative Example 1 is different. Specifically, it includes basic micro powder and colorant, and the colorant accounts for 3% of the total mass of the basic micro powder. The chemical composition of the basic micro powder, by weight, includes: 62.59% SiO2, 20.24% Al2O3, 0.10% Fe2O3, 0.14% TiO2, 0.20% CaO, 0.55% MgO, 6.28% K2O, 5.21% Na2O and 4.69% loss on ignition.

[0071] Comparative Example 2

[0072] The only difference between Comparative Example 2 and Example 1 is that the thickness of the polished glaze layer in Comparative Example 2 is 0.2 mm.

[0073] Comparative Example 3

[0074] The only difference between Comparative Example 3 and Example 1 is that the thickness of the micro powder layer in Comparative Example 3 is 3.0 mm.

[0075] Comparative Example 4

[0076] The only difference between Comparative Example 4 and Example 1 is that the raw material composition of the polished glaze in Comparative Example 4 is different. Its chemical composition, by weight percentage, includes: 53.76% SiO2, 14.52% Al2O3, 0.12% Fe2O3, 0.06% TiO2, 5.12% CaO, 2.89% MgO, 5.49% K2O, 5.81% Na2O, 7.32% ZnO and 4.91% loss on ignition.

[0077] Furthermore, the difference between the coefficient of thermal expansion of the hot-polished glaze and the coefficient of thermal expansion of the micro-powder in Comparative Example 4 is 2.1 × 10⁻⁶ °C within the range of room temperature to 200 °C. -6 ℃ -1 .

[0078] Performance testing

[0079] The double-sided decorative ceramic slab samples obtained in Examples 1-3 and Comparative Examples 1-4 were subjected to relevant performance tests. The sample size was 750×1500mm. The surface decoration effect was visually inspected. The cutting and processing performance was tested according to T / CBCSA40-2021 "Ceramic Slabs". Other properties were tested according to GB / T 4100-2015 "Ceramic Tiles". The flatness of the glaze and the bottom surface was tested after the sample was normally polished and placed for 7 days. The test results are shown in Table 1 below.

[0080] Table 1. Comparison of performance tests of samples prepared in each embodiment and comparative example. As shown in Table 1, the samples prepared in Examples 1-3 all showed good performance in terms of thermal shock resistance, flatness, and cutting performance. However, the samples in Comparative Examples 1-4 all showed cutting cracks. At the same time, the flatness of the glaze surface and bottom surface of all the samples in the comparative examples was poor, that is, the hysteresis deformation was large. Furthermore, the sample in Comparative Example 4 had poor thermal shock resistance. This indicates that the changes in the glaze composition, glaze thickness, micro powder layer composition, micro powder layer thickness, and body-glaze thermal expansion coefficient of the double-sided decorative ceramic slabs in Comparative Examples 1-4 all led to the generation of defects in the samples.

[0081] For those skilled in the art, several simple deductions or substitutions can be made without departing from the inventive concept, without requiring creative effort. Therefore, any simple improvements made to this invention by those skilled in the art based on the disclosure of this invention should be within the scope of protection of this invention. The above embodiments are preferred embodiments of this invention, and all processes similar to this invention and equivalent changes should fall within the scope of protection of this invention.

Claims

1. A double-sided decorative ceramic slab, characterized in that, From bottom to top, it includes a back micro-powder decorative layer, an intermediate body layer, a base glaze layer, a pattern decorative layer, and a polished glaze layer; The backing micro-powder decorative layer is formed by a predetermined backing pattern made of micro-powder of several colors. The intermediate blank layer is formed by arranging blank powder of several colors to form a predetermined blank pattern, and the blank powder includes color powder and basic blank material; The micro powder has the same raw material composition as the color powder; The color powder comprises the base blank and the colorant, wherein the colorant accounts for 3-5% of the mass of the color powder. The chemical composition of the base billet, by weight percentage, includes: 65-70% SiO2, 15-20% Al2O3, 0.5-1.5% Fe2O3, 0.1-0.3% TiO2, 0.1-0.3% CaO, 0.3-0.5% MgO, 2-5% K2O, and 1-3% [unclear - possibly a percentage]. Na2O and 4-6% loss on ignition; The fineness of the micro powder is less than that of the color powder, and the fineness of the micro powder is less than 250 mesh. The thickness of the backing micro-powder decorative layer accounts for 10-15% of the total thickness of the double-sided decorative ceramic slab, and the thickness of the polished glaze layer is 0.5-0.8 mm; The polished glaze layer is formed by polishing and firing. The chemical composition of the polished glaze, by weight percentage, includes: 48-51% SiO2, 15-18% Al2O3, 0.1-0.3% Fe2O3, 0.05-0.1% TiO2, 8-12% CaO, 3-5% MgO, 3-5% K2O, 1-3% Na2O, 8-10% ZnO and 4-6% loss on ignition; The difference between the coefficient of thermal expansion of the polished glaze and the coefficient of thermal expansion of the micro-powder is less than 1.2 × 10⁻⁶ within the range of room temperature to 200°C. -6 ℃ -1 .

2. The double-sided decorative ceramic slab according to claim 1, characterized in that, The base glaze layer is formed by firing a base glaze, and the chemical composition of the base glaze, by weight percentage, includes: 65-70% SiO2, 20-25% Al2O3, 0.1-0.3% Fe2O3, 0.1-0.3% TiO2, 1-3% CaO, 1-3% MgO, 2-5% K2O, 1-3% Na2O, 0.5-1% ZrO2, 0.01-0.03% ZnO and 1-3% loss on ignition.

3. A method for preparing a double-sided decorative ceramic slab as described in any one of claims 1-2, characterized in that, Includes the following steps: (1) Divide the base blank into several parts and mix them with different colored pigments to obtain different colored powders; then mix the different colored powders with the base blank to obtain different colored blank powders. (2) The different colored powders obtained in step (1) are crushed and ground into powder to obtain micro powders of different colors. (3) Apply the different colored blank powders obtained in step (1) to the mold according to the predetermined blank pattern, scrape it flat, continue to apply the different colored micro powders obtained in step (2) according to the back and bottom pattern, press and shape it to obtain the back and bottom micro powder decorative layer and the middle blank layer. (4) Apply a base glaze, print a pattern by inkjet printing, and apply a polishing glaze to the surface of the intermediate body layer obtained in step (3) in sequence to form a base glaze layer, a pattern decoration layer and a polishing glaze layer in sequence; then brush a base slurry on the surface of the back micro powder decoration layer, dry it and fire it in a kiln to obtain a semi-finished ceramic slab. (5) After grinding the edges and polishing the glaze layer of the semi-finished ceramic rock slab obtained in step (4), turn the brick over; then polish the back micro powder decorative layer, wax it to prevent stains, and apply a film, and turn the brick over again; finally wax the glaze layer to prevent stains and apply a film to obtain the double-sided decorative ceramic rock slab.

4. The method for preparing double-sided decorative ceramic slabs according to claim 3, characterized in that, In step (4), the firing temperature is 1180-1230℃ and the firing cycle is 55-65min.

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