Dark-colored gold silk velvet texture ceramic rock plate, base glaze and preparation method thereof

Abstract

This invention discloses a dark-colored velvet-textured ceramic slab, a base glaze, and its preparation method. The dark-colored velvet-textured base glaze is prepared by ball milling according to the following mass ratio of material: water: carboxymethyl cellulose: sodium tripolyphosphate: 100:36:(0.1-0.2):(0.3-0.5). The material of the velvet-textured base glaze is prepared from the following components in parts by weight: 3-8 parts wollastonite, 5-10 parts dolomite, 10-15 parts strontium carbonate, 2-5 parts calcined talc, 30-40 parts potassium feldspar, 5-10 parts nepheline, 5-10 parts calcined kaolin, 5-15 parts quartz, 1-5 parts white corundum, 3-8 parts calcined zinc oxide, and 10-15 parts matte transparent frit. The matte transparent frit includes the following components in the following mass percentage: SiO2. The composition is 55-60%, Al₂O₃ 12-15%, K₂O 2-3%, Na₂O 3-4%, CaO 20-25%, and the calcination vector of the matte transparent frit is 1%-5%. This solution improves the light transmittance of the glaze layer, enhances the transparency, and maintains a uniform and dispersed surface gloss without crystallization, resulting in a glaze surface with a velvety soft feel.

Description

Technical Field

[0001] This invention relates to the field of ceramic slab production and processing technology, and in particular to a dark-colored velvet-textured ceramic slab, a base glaze, and a method for preparing the same. Background Technology

[0002] With economic development and the improvement of people's living standards, the building floor decoration industry is receiving increasing attention and occupies a major part of home decoration. Ceramic slabs, as a new type of decorative material, are widely used in home decoration and can be used for background walls, cabinets, wardrobes, tea sets, bathroom vanities, washbasins, doors, and kitchen countertops, etc.

[0003] Currently, as the application market for ceramic slabs expands, the demands on ceramic decoration technology are becoming increasingly stringent. Modern ceramic slabs achieve their surface decorative effects primarily through the use of various glazes, giving them rich colors and textures to enhance their aesthetic appeal. Different glaze formulations produce different effects, resulting in smooth, transparent, and matte finishes. For example, patent ZL202111435725.X discloses a velvet-textured ceramic slab. This slab improves the velvet glaze and glazing process, resulting in a more uniform glaze distribution, preventing splitting, and improving the smoothness, gloss, and fineness of the glaze surface. However, this patented velvet ceramic slab has a light-colored tile surface and cannot be directly applied to dark-colored tile surfaces.

[0004] Therefore, it is necessary to develop a velvet-textured ceramic slab that can be applied to dark-colored brick surfaces, further enhancing its gloss, smoothness, and fineness, making the velvet effect more pronounced, thereby expanding the product's applicability. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, one of the objectives of the present invention is to provide a dark gold velvet base glaze.

[0006] The second objective of this invention is to provide a method for preparing a dark gold velvet-based glaze.

[0007] The third objective of this invention is to provide a method for preparing a dark-colored velvet-textured ceramic slab.

[0008] The fourth objective of this invention is to provide a dark-colored, velvet-textured ceramic slab.

[0009] One objective of this invention is achieved through the following technical solution: a dark-colored velvet-based glaze, characterized in that the velvet-based glaze is prepared according to a formula, with the addition of carboxymethyl cellulose and sodium tripolyphosphate, and then ball-milled; wherein the mass ratio of the velvet-based glaze material:water:carboxymethyl cellulose:sodium tripolyphosphate is 100:36:(0.1-0.2):(0.3-0.5).

[0010] The gold velvet base glaze is prepared from the following components in parts by weight: 3-8 parts wollastonite, 5-10 parts dolomite, 10-15 parts strontium carbonate, 2-5 parts calcined talc, 30-40 parts potassium feldspar, 5-10 parts nepheline, 5-10 parts calcined kaolin, 5-15 parts quartz, 1-5 parts white corundum, 3-8 parts calcined zinc oxide, and 10-15 parts matte transparent frit.

[0011] The matte transparent frit comprises, by mass percentage, the following components: SiO2 55-60%, Al2O3 12-15%, K2O 2-3%, Na2O 3-4%, CaO 20-25%, and the calcination weight of the matte transparent frit is 1%-5%.

[0012] Optionally, the chemical composition of the dark gold velvet base glaze includes: SiO2 45-50%, Al2O3 13-15%, K2O 4-5%, Na2O 1-2%, CaO 4-5%, MgO 5-6%, SrO 8-9%, ZnO 4-5%, and the loss on ignition of the dark gold velvet base glaze is 5%-10%.

[0013] The second objective of this invention is achieved by the following technical solution: a method for preparing a dark-colored velvet-based glaze, comprising the following steps:

[0014] The ingredients for the velvet-based glaze are prepared according to the formula, with the addition of carboxymethyl cellulose and sodium tripolyphosphate. The mass ratio of velvet-based glaze material: water: carboxymethyl cellulose: sodium tripolyphosphate is 100:36:(0.1-0.2):(0.3-0.5). After preparation, the mixture is ball-milled for 8-9 hours to achieve the following glaze slurry properties: 325 mesh, 0.4-0.6% residue on sieve, specific gravity 1.88-1.95, and ball flow rate 60-80 seconds.

[0015] The third objective of this invention is achieved by the following technical solution: a method for preparing a dark-colored velvet-textured ceramic slab, comprising the following steps:

[0016] (1) Blank forming

[0017] The ceramic slab powder is pressed into ceramic slab blanks; the blanks are then transported to a drying kiln for drying; after passing through the drying kiln, the blanks are sprayed with water to maintain surface humidity;

[0018] (2) Apply base glaze

[0019] The base glaze is poured onto the surface of the body to form a base glaze layer; the specific gravity of the base glaze is 1.85-1.92, the flow rate is 32-36s, and the amount of glaze applied is 85-95g.

[0020] (3) Apply the first coat of dark gold velvet glaze.

[0021] Add 0.3g of ink remover and 0.33g of defoamer to every 100g of dark gold velvet base glaze. Adjust the glaze paste to a specific gravity of 1.2-1.25 with water, stir evenly, and spray the first layer of dark gold velvet glaze onto the base glaze surface using an imported oscillating spray booth. The glaze application amount is 12-15g, and the spraying speed is 10-15s.

[0022] (4) Inkjet printing

[0023] On the first layer of dark gold velvet glaze, inkjet printing is then applied according to the designed pattern to form a printed layer;

[0024] (5) Apply the second coat of dark gold velvet glaze.

[0025] Add 0.3g of ink remover and 0.33g of defoamer to every 100g of dark gold velvet base glaze. Adjust the glaze paste to a specific gravity of 1.88-1.95 with water, stir well, and apply the second layer of dark gold velvet glaze to the surface of the printed layer using a bell-shaped glaze applicator. The amount of glaze applied is 85-90g, and the flow rate is 30-33s.

[0026] (6) The glazed body is sent into the kiln, fired at high temperature, removed from the kiln, cooled, edged, inspected and put into storage to obtain the finished ceramic product.

[0027] Optionally, in steps (3) and (5), the velvet-based glaze comprises the following components by weight: 3-8 parts wollastonite, 5-10 parts dolomite, 10-15 parts strontium carbonate, 2-5 parts calcined talc, 30-40 parts potassium feldspar, 5-10 parts nepheline, 5-10 parts calcined kaolin, 5-15 parts quartz, 1-5 parts white corundum, 3-8 parts calcined zinc oxide, and 10-15 parts matte transparent frit.

[0028] The chemical composition of the matte transparent frit, by mass percentage, includes: SiO2 55-60%, Al2O3 12-15%, K2O 2-3%, Na2O 3-4%, CaO 20-25%, and the calcination weight of the matte frit is 1%-5%.

[0029] Optionally, the preparation process of the velvet-based glaze is as follows: The velvet-based glaze is prepared according to the formula, and carboxymethyl cellulose and sodium tripolyphosphate are added as additives; wherein, the mass ratio of velvet-based glaze material: water: carboxymethyl cellulose: sodium tripolyphosphate is 100:36:(0.1-0.2):(0.3-0.5). After preparation, ball milling is performed for 8-9 hours to achieve the following glaze slurry properties: 325 mesh, 0.4-0.6% residue on sieve, specific gravity 1.88-1.95, and ball flow rate 60-80 seconds.

[0030] Optionally, in step (1), the green body is prepared from the following components in parts by weight: 16-18 parts of potassium sodium stone, 3-5 parts of potassium feldspar, 12-14 parts of super white stone particles, 1-3 parts of strong plastic sand, 20-24 parts of selected sand, 15-18 parts of calcined kaolin, 2-4 parts of high alumina powder, 3-5 parts of high clay, 6-8 parts of Fu white sand, 11-13 parts of high white calcined kaolin, 4-5 parts of green body black material, 0.5-0.8 parts of water glass, 0.1-0.3 parts of sodium tripolyphosphate, and 0.1-0.2 parts of degumming agent.

[0031] Optionally, in step (2), the base glaze is prepared from the following components in parts by weight: 32-38 parts potassium feldspar, 18-22 parts sodium feldspar, 6-9 parts quartz, 20-25 parts calcined clay, 10-14 parts calcined alumina, and 1-3 parts calcined zinc oxide.

[0032] The chemical composition of the base glaze, by mass percentage, includes: SiO2 55-60%, CaO 0.2-0.4%, Al2O3 30-35%, Na2O 2-5%, K2O 2-5%, MgO 0.1-0.5%, and ZnO 2-3%, and the loss on ignition of the base glaze is 0.01-5%.

[0033] Optionally, in step (6), the firing temperature is 1160℃-1180℃ and the firing time is 70-90min.

[0034] The fourth objective of this invention is achieved by the following technical solution: a dark gold velvet textured ceramic slab, prepared by the above-described method for preparing dark gold velvet textured ceramic slabs.

[0035] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0036] (1) In terms of formulation, this application improves the translucency of the glaze by adjusting the ratio of SiO2 and Al2O3 in the velvet-based glaze formulation, increasing the content of fluxes such as CaO, MgO, and SrO, and adding dolomite and a specially made matte transparent frit material. This enhances the transparency of the glaze while maintaining a uniform and dispersed surface gloss, preventing crystallization, achieving a gloss level of 25-35 degrees, and giving the glaze a soft, velvety feel. In addition, adjusting the melting temperature of the formulation solves problems such as pinholes and blistering on the glaze surface during production.

[0037] (2) In terms of the preparation process, this application adds a gold velvet base glaze before inkjet printing. Specifically, it uses an imported swing-type glaze spraying cabinet to spray the gold velvet base glaze and adjusts the initial melting temperature of the glaze. This can improve the light transmittance of the glaze layer and solve the ink discharge problem that occurs when producing dark bricks. Attached Figure Description

[0038] like Figure 1 The image shows a photograph of the example ceramic slab and the test ceramic slab under the same indoor lighting conditions.

[0039] In the figure: A, ceramic slab of Example 5; B, ceramic slab of Comparative Example 5. Detailed Implementation

[0040] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0041] In this invention, unless otherwise specified, all parts and percentages are by weight, and the equipment and raw materials used are commercially available or commonly used in the art. Unless otherwise specified, the methods in the following embodiments are conventional methods in the art.

[0042] This invention provides a dark-colored velvet-based glaze, which is prepared by mixing the velvet-based glaze materials according to the formula, adding carboxymethyl cellulose and sodium tripolyphosphate as additives, and then ball-milling; wherein the mass ratio of the velvet-based glaze materials:water:carboxymethyl cellulose:sodium tripolyphosphate is 100:36:(0.1-0.2):(0.3-0.5).

[0043] The gold velvet base glaze is prepared from the following components in parts by weight: 3-8 parts wollastonite, 5-10 parts dolomite, 10-15 parts strontium carbonate, 2-5 parts calcined talc, 30-40 parts potassium feldspar, 5-10 parts nepheline, 5-10 parts calcined kaolin, 5-15 parts quartz, 1-5 parts white corundum, 3-8 parts calcined zinc oxide, and 10-15 parts matte transparent frit.

[0044] The matte transparent frit comprises, by mass percentage, the following components: SiO2 55-60%, Al2O3 12-15%, K2O 2-3%, Na2O 3-4%, CaO 20-25%, and the calcination weight of the matte transparent frit is 1%-5%.

[0045] This application improves the translucency of the glaze by adjusting the ratio of SiO2 and Al2O3 in the velvet-based glaze formula, increasing the content of fluxes such as CaO, MgO, and SrO, and adding dolomite and a specially formulated matte transparent frit material. This enhances the translucency while maintaining a uniform and dispersed surface gloss, preventing crystallization, achieving a gloss level of 25-35 degrees, and providing a velvety-soft feel. Furthermore, adjusting the melting temperature of the formula resolves issues such as pinholes and blistering on the glaze surface during production.

[0046] As a further embodiment, the chemical composition of the dark velvet-based glaze includes: SiO2 45-50%, Al2O3 13-15%, K2O 4-5%, Na2O 1-2%, CaO 4-5%, MgO 5-6%, SrO 8-9%, and ZnO 4-5%, and the loss on ignition of the dark velvet-based glaze is 5%-10%. The matte transparent frit uses raw materials including albite, potassium feldspar, quartz powder, alumina, and zinc oxide; after mixing, melting at 1530℃, and water quenching, a crystallized frit is obtained.

[0047] This invention also provides a method for preparing a dark gold velvet-based glaze, comprising the following steps:

[0048] The ingredients for the velvet-based glaze are prepared according to the formula, with the addition of carboxymethyl cellulose and sodium tripolyphosphate. The mass ratio of velvet-based glaze material: water: carboxymethyl cellulose: sodium tripolyphosphate is 100:36:(0.1-0.2):(0.3-0.5). After preparation, the mixture is ball-milled for 8-9 hours to achieve the following glaze slurry properties: 325 mesh, 0.4-0.6% residue on sieve, specific gravity 1.88-1.95, and ball flow rate 60-80 seconds.

[0049] This invention also provides a method for preparing a dark-colored velvet-textured ceramic slab, comprising the following steps:

[0050] (1) Blank forming

[0051] The ceramic slab powder is pressed into ceramic slab blanks; the blanks are then transported to a drying kiln for drying; after passing through the drying kiln, the blanks are sprayed with water to maintain surface humidity;

[0052] (2) Apply base glaze

[0053] The base glaze is poured onto the surface of the body to form a base glaze layer; the specific gravity of the base glaze is 1.85-1.92, the flow rate is 32-36s, and the amount of glaze applied is 85-95g.

[0054] (3) Apply the first coat of dark gold velvet glaze.

[0055] Add 0.3g of ink remover and 0.33g of defoamer to every 100g of dark gold velvet base glaze. Adjust the glaze paste to a specific gravity of 1.2-1.25 with water, stir evenly, and spray the first layer of dark gold velvet glaze onto the base glaze surface using an imported oscillating spray booth. The glaze application amount is 12-15g, and the spraying speed is 10-15s.

[0056] (4) Inkjet printing

[0057] On the first layer of dark gold velvet glaze, inkjet printing is then applied according to the designed pattern to form a printed layer;

[0058] (5) Apply the second coat of dark gold velvet glaze.

[0059] Add 0.3g of ink remover and 0.33g of defoamer to every 100g of dark gold velvet base glaze. Adjust the glaze paste to a specific gravity of 1.88-1.95 with water, stir well, and apply the second layer of dark gold velvet glaze to the surface of the printed layer using a bell-shaped glaze applicator. The amount of glaze applied is 85-90g, and the flow rate is 30-33s.

[0060] (6) The glazed body is sent into the kiln, fired at high temperature, removed from the kiln, cooled, edged, inspected and put into storage to obtain the finished ceramic product.

[0061] In terms of the preparation process, this application adds a gold velvet base glaze before inkjet printing. Specifically, it uses an imported swing-type glaze spraying cabinet to spray the gold velvet base glaze and adjusts the initial melting temperature of the glaze to improve the light transmittance of the glaze layer and solve the ink discharge problem that occurs when producing dark bricks.

[0062] As a further embodiment, in steps (3) and (5), the velvet-based glaze comprises the following components in parts by weight: 3-8 parts wollastonite, 5-10 parts dolomite, 10-15 parts strontium carbonate, 2-5 parts calcined talc, 30-40 parts potassium feldspar, 5-10 parts nepheline, 5-10 parts calcined kaolin, 5-15 parts quartz, 1-5 parts white corundum, 3-8 parts calcined zinc oxide, and 10-15 parts matte transparent frit.

[0063] The chemical composition of the matte transparent frit, by mass percentage, includes: SiO2 55-60%, Al2O3 12-15%, K2O 2-3%, Na2O 3-4%, CaO 20-25%, and the calcination weight of the matte frit is 1%-5%.

[0064] As a further embodiment, the preparation process of the velvet-based glaze is as follows: The velvet-based glaze is prepared according to the formula, and carboxymethyl cellulose and sodium tripolyphosphate are added as additives; wherein, the mass ratio of velvet-based glaze material: water: carboxymethyl cellulose: sodium tripolyphosphate is 100:36:(0.1-0.2):(0.3-0.5). After preparation, ball milling is performed for 8-9 hours to achieve the following glaze slurry properties: 325 mesh, 0.4-0.6% residue on sieve, specific gravity 1.88-1.95, and ball flow rate 60-80 seconds.

[0065] As a further embodiment, in step (1), the blank is prepared from the following components in parts by weight: 16-18 parts of potassium sodium stone, 3-5 parts of potassium feldspar, 12-14 parts of super white stone particles, 1-3 parts of strong plastic sand, 20-24 parts of selected sand, 15-18 parts of calcined kaolin, 2-4 parts of high alumina powder, 3-5 parts of high clay, 6-8 parts of Fu white sand, 11-13 parts of high white calcined kaolin, 4-5 parts of blank black material, 0.5-0.8 parts of water glass, 0.1-0.3 parts of sodium tripolyphosphate, and 0.1-0.2 parts of degumming agent.

[0066] As a further embodiment, in step (2), the base glaze is prepared from the following components in parts by weight: 32-38 parts potassium feldspar, 18-22 parts sodium feldspar, 6-9 parts quartz, 20-25 parts calcined clay, 10-14 parts calcined alumina, and 1-3 parts calcined zinc oxide.

[0067] The chemical composition of the base glaze, by mass percentage, includes: SiO2 55-60%, CaO 0.2-0.4%, Al2O3 30-35%, Na2O 2-5%, K2O 2-5%, MgO 0.1-0.5%, and ZnO 2-3%, and the loss on ignition of the base glaze is 0.01-5%.

[0068] As a further implementation, in step (6), the firing temperature is 1160℃-1180℃ and the firing time is 70-90min.

[0069] The present invention also provides a dark gold velvet textured ceramic slab, which is prepared by the above-described method for preparing dark gold velvet textured ceramic slabs.

[0070] The following are specific embodiments of the present invention. Unless otherwise specified, the raw materials, equipment and other materials used in the following embodiments can be obtained by purchasing.

[0071] Examples 1-3: Dark Gold Velvet Base Glaze

[0072] The raw materials for the dark gold velvet-based glazes in Examples 1-3 were weighed according to the proportions in Table 1, and the dark gold velvet-based glazes were prepared according to the preparation methods in Table 1. This resulted in different examples of dark gold velvet-based glazes, as detailed in Table 1.

[0073] Table 1. Material proportions for dark gold velvet-based glazes in Examples 1-3.

[0074]

[0075]

[0076] The matte transparent frit described in Table 1 uses raw materials including albite, potassium feldspar, quartz powder, alumina, and zinc oxide. After mixing, melting at 1530℃, and water quenching, a crystallized frit is obtained. This matte transparent frit contains the following components by mass percentage: SiO2 58%, Al2O3 13%, K2O 2.5%, Na2O 3.5%, and CaO 23%. The calcination weight of the matte transparent frit is 13%.

[0077] The dark gold velvet-based glazes in Examples 1-3 were all prepared using the following process:

[0078] The materials for the dark gold velvet base glaze (the proportions in Table 1) are prepared as follows: water: carboxymethyl cellulose: sodium tripolyphosphate in a mass ratio of 100:36:0.15:0.4. After preparation, the materials are ball-milled for 8-9 hours to achieve the following glaze slurry properties: 325 mesh, 0.5% residue on sieve, specific gravity 1.9, and ball flow rate 70s.

[0079] Examples 4-6 Dark Gold Velvet Textured Ceramic Slabs

[0080] The dark gold velvet textured ceramic slab in this example was prepared by the following steps:

[0081] (1) Blank forming

[0082] Ceramic slab powder is pressed into ceramic slab blanks; the blanks are then transported to a drying kiln for drying; after passing through the drying kiln, the blanks are sprayed with water to maintain surface humidity; the blanks are prepared from the following components in parts by weight: 17 parts potassium sodium stone, 4 parts potassium feldspar, 13 parts ultra-white stone particles, 2 parts strong plastic sand, 22 parts selected sand, 16 parts calcined kaolin, 3 parts high alumina powder, 4 parts high clay, 7 parts Fu white sand, 12 parts high white calcined kaolin, 4.5 parts black blank material, 0.6 parts water glass, 0.2 parts sodium tripolyphosphate, and 0.15 parts desiccant.

[0083] (2) Apply base glaze

[0084] The base glaze is poured onto the surface of the body to form a base glaze layer; the specific gravity of the base glaze is 1.85-1.92, the flow rate is 32-36s, and the amount of glaze applied is 85-95g; wherein, the base glaze is prepared from the following components in parts by weight: 36 parts potassium feldspar, 20 parts sodium feldspar, 8 parts quartz, 23 parts calcined clay, 12 parts calcined alumina, and 2 parts calcined zinc oxide.

[0085] The chemical composition of the base glaze, by mass percentage, includes: 58% SiO2, 0.3% CaO, 32% Al2O3, 3% Na2O, 3% K2O, 0.3% MgO, and 2.5% ZnO, and the loss on ignition of the base glaze is 0.05%.

[0086] (3) Apply the first coat of dark gold velvet glaze.

[0087] Add 0.3g of ink remover and 0.33g of defoamer to every 100g of dark gold velvet base glaze. Adjust the glaze paste to a specific gravity of 1.2-1.25 with water, stir evenly, and spray the first layer of dark gold velvet glaze onto the base glaze surface using an imported oscillating spray booth to form the first layer of dark gold velvet glaze. The glaze application amount is 12-15g, and the flow rate is 10-15s.

[0088] (4) Inkjet printing

[0089] On the first layer of dark gold velvet glaze, inkjet printing is then applied according to the designed pattern to form a printed layer;

[0090] (5) Apply the second coat of dark gold velvet glaze.

[0091] Add 0.3g of ink remover and 0.33g of defoamer to every 100g of dark gold velvet base glaze. Adjust the glaze paste to a specific gravity of 1.88-1.95 with water, stir well, and apply the second layer of dark gold velvet glaze to the surface of the printed layer using a bell-shaped glaze applicator. The amount of glaze applied is 85-90g, and the flow rate is 30-33s.

[0092] (6) The glazed body is sent into the kiln for high-temperature firing, then removed from the kiln, cooled, edged, inspected, and stored to obtain the finished ceramic product. The firing temperature is 1170℃ and the firing time is 75 minutes.

[0093] In Examples 4-6, in steps (3) and (5), the velvet base glaze corresponds to the dark velvet base glaze prepared in Examples 1-3.

[0094] Comparative Example 1

[0095] Compared with Example 5, the difference in Comparative Example 1 is that the raw material ratio of the dark gold velvet base glaze lacks matte transparent frit and dolomite. The dark gold velvet base glaze used in Example 5 corresponds to the formula of the dark gold velvet base glaze from Example 2. The parameters and conditions of the other preparation methods are the same as those in Example 5.

[0096] Comparative Example 2

[0097] Compared with Example 5, Comparative Example 2 differs in that the formulation of the velvet-based glaze is different. Specifically, it adopts the velvet-based glaze formulation from Example 1 of Patent No. ZL202111435725.X, which is prepared from the following components by weight: 10 parts wollastonite, 7 parts strontium carbonate, 13 parts calcined talc, 35 parts potassium feldspar, 15 parts nepheline, 8 parts calcined kaolin, 4 parts quartz, 3 parts white corundum, and 5 parts calcined zinc oxide. The chemical composition of the velvet-based glaze, by mass percentage, includes: SiO2 53.3%, Al2O3 16.37%, K2O 3.9%, Na2O 3.15%, CaO 4.95%, MgO 4.29%, SrO 4.9%, and ZnO 5%. The loss on ignition of the velvet-based glaze is 3.14%.

[0098] Comparative Example 3

[0099] Compared with Example 5, the difference of Comparative Example 3 is that the ceramic slab process lacks step (3) of applying the first layer of dark gold velvet glaze, while the remaining formula composition and production method conditions are the same as in Example 5.

[0100] Comparative Example 4

[0101] Compared with Example 5, the difference in Comparative Example 4 is that step (5) of applying a second layer of dark gold velvet glaze is missing in the ceramic slab process, while the rest of the formula composition and production method conditions are the same as in Example 5.

[0102] Comparative Example 5

[0103] The ceramic slab in Comparative Example 5 was prepared using the formula and process described in Patent No. ZL202111435725.X.

[0104] Effect evaluation and performance testing

[0105] 1. The performance of the ceramic slabs of Examples 4-6 and Comparative Examples 1-5 was tested. The test items and results are shown in Table 2.

[0106] Scoring criteria: 10 points is the maximum score, and the higher the score, the more ideal the effect.

[0107] Dark hair color: The standard for judgment is the color rendering of the pattern. Under dark colors, the best effect is when the hair color is transparent and does not deviate from the color.

[0108] Glaze surface smoothness: The standard is the feel of the hand, with parameters being soft, fine, and smooth, and the best is velvety softness;

[0109] Gloss: The test method uses a gloss meter for measurement;

[0110] Crystallization: Observe the crystals on the glaze surface; non-crystallization is preferable.

[0111] Stain resistance: The score is based on the result of wiping the oil-based pen mark; the cleaner the wipe, the higher the score.

[0112] Table 2: Performance Test Table of Ceramic Slabs in Examples 4-6 and Comparative Examples 1-5

[0113]

[0114] 2. Illumination test

[0115] The dark gold velvet textured ceramic slab of Example 5 and the gold velvet textured ceramic slab of Comparative Example 5 were subjected to lighting tests under the same indoor environment to observe their surface effects.

[0116] like Figure 1 The image shows on-site photographs of the example ceramic slab and the experimental ceramic slab under the same indoor lighting conditions. In the image, tile A is the dark velvet-textured ceramic slab of Example 5, and tile B is the velvet-textured ceramic slab of Comparative Example 5. The results show that the dark velvet-textured ceramic slab of the present invention exhibits superior surface finish, dark color intensity, flatness, gloss, and fineness compared to existing velvet-textured ceramic slabs.

[0117] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A dark-colored velvet-based glaze, characterized in that, The ingredients for the velvet-based glaze are prepared according to the formula, with the addition of carboxymethyl cellulose and sodium tripolyphosphate, and then ball-milled. The mass ratio of the velvet-based glaze ingredients to water to carboxymethyl cellulose to sodium tripolyphosphate is 100:36:(0.1-0.2):(0.3-0.5). The gold velvet base glaze is prepared from the following components in parts by weight: 3-8 parts wollastonite, 5-10 parts dolomite, 10-15 parts strontium carbonate, 2-5 parts calcined talc, 30-40 parts potassium feldspar, 5-10 parts nepheline, 5-10 parts calcined kaolin, 5-15 parts quartz, 1-5 parts white corundum, 3-8 parts calcined zinc oxide, and 10-15 parts matte transparent frit. The matte transparent frit comprises the following components by mass percentage: SiO2 55-60%, Al2O3 12-15%, K2O 2-3%, Na2O 3-4%, CaO 20-25%, and the loss on ignition of the matte transparent frit is 1%-5%. The chemical composition of the dark gold velvet base glaze includes: SiO2 45-50%, Al2O3 13-15%, K2O 4-5%, Na2O 1-2%, CaO 4-5%, MgO 5-6%, SrO 8-9%, ZnO 4-5%, and the loss on ignition of the dark gold velvet base glaze is 5%-10%.

2. A method for preparing a dark gold velvet-based glaze, characterized in that, Includes the following steps: The ingredients for the velvet-based glaze are prepared according to the formula, with the addition of carboxymethyl cellulose and sodium tripolyphosphate. The mass ratio of velvet-based glaze material: water: carboxymethyl cellulose: sodium tripolyphosphate is 100:36:(0.1-0.2):(0.3-0.5). After preparation, the mixture is ball-milled for 8-9 hours to achieve the following glaze slurry properties: 325 mesh, 0.4-0.6% residue on sieve, specific gravity 1.88-1.95, and ball flow rate 60-80 seconds. The velvet-based glaze is composed of the components described in claim 1 by weight.

3. A method for preparing a dark-colored, velvety-textured ceramic slab, characterized in that, Includes the following steps: (1) Blank forming The ceramic slab powder is pressed into ceramic slab blanks; the blanks are then transported to a drying kiln for drying; after passing through the drying kiln, the blanks are sprayed with water to maintain surface humidity; (2) Applying base glaze: The base glaze is poured onto the surface of the body to form a base glaze layer; the specific gravity of the base glaze is 1.85-1.92, the flow rate is 32-36s, and the amount of glaze applied is 85-95g. (3) Apply the first coat of dark gold velvet glaze. Add 0.3g of ink remover and 0.33g of defoamer to every 100g of the dark gold velvet base glaze as described in claim 1. Adjust the glaze paste to a specific gravity of 1.2-1.25 with water, stir evenly, and spray the first layer of dark gold velvet glaze onto the base glaze surface using an imported oscillating spray glaze booth to form the first layer of dark gold velvet glaze; the glaze application amount is 12-15g, and the flow rate is 10-15s; (4) Inkjet printing On the first layer of dark gold velvet glaze, inkjet printing is then applied according to the designed pattern to form a printed layer; (5) Apply the second coat of dark gold velvet glaze. Add 0.3g of ink remover and 0.33g of defoamer to every 100g of dark gold velvet base glaze. Adjust the glaze paste to a specific gravity of 1.88-1.95 with water, stir well, and apply the second layer of dark gold velvet glaze to the surface of the printed layer using a bell-shaped glaze applicator. The amount of glaze applied is 85-90g, and the flow rate is 30-33s. (6) The glazed body is sent into the kiln, fired at high temperature, removed from the kiln, cooled, edged, inspected and put into storage to obtain the finished ceramic product.

4. The method for preparing the dark gold velvet textured ceramic slab as described in claim 3, characterized in that, In steps (3) and (5), the gold velvet base glaze comprises the following components in parts by weight: 3-8 parts wollastonite, 5-10 parts dolomite, 10-15 parts strontium carbonate, 2-5 parts calcined talc, 30-40 parts potassium feldspar, 5-10 parts nepheline, 5-10 parts calcined kaolin, 5-15 parts quartz, 1-5 parts white corundum, 3-8 parts calcined zinc oxide, and 10-15 parts matte transparent frit. The chemical composition of the matte transparent frit, by mass percentage, includes: SiO2 55-60%, Al2O3 12-15%, K2O 2-3%, Na2O 3-4%, CaO 20-25%, and the loss on ignition of the matte frit is 1%-5%.

5. The method for preparing the dark gold velvet textured ceramic slab as described in claim 4, characterized in that, The preparation process of the gold velvet-based glaze is as follows: The gold velvet-based glaze is prepared according to the formula, and carboxymethyl cellulose and sodium tripolyphosphate are added as additives. The mass ratio of gold velvet-based glaze material: water: carboxymethyl cellulose: sodium tripolyphosphate is 100:36:(0.1-0.2):(0.3-0.5). After preparation, the mixture is ball-milled for 8-9 hours to achieve the following glaze slurry properties: 325 mesh, 0.4-0.6% residue on a sieve, specific gravity 1.88-1.95, and ball flow rate 60-80 seconds.

6. The method for preparing the dark gold velvet textured ceramic slab as described in claim 3, characterized in that, In step (1), the green body is prepared from the following components in parts by weight: 16-18 parts of potassium sodium stone, 3-5 parts of potassium feldspar, 12-14 parts of super white stone particles, 1-3 parts of strong plastic sand, 20-24 parts of selected sand, 15-18 parts of calcined kaolin, 2-4 parts of high alumina powder, 3-5 parts of high clay, 6-8 parts of Fu white sand, 11-13 parts of high white calcined kaolin, 4-5 parts of green body black material, 0.5-0.8 parts of water glass, 0.1-0.3 parts of sodium tripolyphosphate, and 0.1-0.2 parts of degumming agent.

7. The method for preparing the dark gold velvet textured ceramic slab as described in claim 3, characterized in that, In step (2), the base glaze is prepared from the following components in parts by weight: 32-38 parts potassium feldspar, 18-22 parts sodium feldspar, 6-9 parts quartz, 20-25 parts calcined clay, 10-14 parts calcined alumina, and 1-3 parts calcined zinc oxide. The chemical composition of the base glaze, by mass percentage, includes: SiO2 55-60%, CaO 0.2-0.4%, Al2O3 30-35%, Na2O 2-5%, K2O 2-5%, MgO 0.1-0.5%, and ZnO 2-3%, and the loss on ignition of the base glaze is 0.01-5%.

8. The method for preparing the dark gold velvet textured ceramic slab as described in claim 3, characterized in that, In step (6), the firing temperature is 1160℃-1180℃ and the firing time is 70-90min.

9. A dark-colored, velvet-textured ceramic slab, characterized in that, It is prepared by the method for preparing dark gold velvet textured ceramic slabs according to any one of claims 3-8.

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