A surface finishing process for combining a directional etching ink with a marble rock panel

Abstract

This invention belongs to the field of ceramic building materials, specifically relating to a surface decoration treatment method combining directional etching ink with marble slabs. The surface decoration treatment method includes: applying a base glaze to the surface of a ceramic body; inkjet printing a natural stone design pattern onto the glazed surface using conventional ceramic ink; inkjet printing directional etching ink onto the glazed surface; applying a decorative glaze containing a covering glaze onto the glazed surface; and firing the glazed ceramic body. This invention uses a special functional ink containing low-temperature frit to pre-penetrate and etch the marble slab, then inkjet prints it in specific locations matching the design, creating a relatively matte, frosted effect with downward concavity in specific areas.

Description

Technical Field

[0001] This invention belongs to the field of ceramic building materials preparation, and specifically relates to a surface decoration treatment method that combines directional etching ink with marble slabs. Background Technology

[0002] Current methods for treating natural stone mainly include acid washing and mechanical sandblasting. Acid washing involves spraying an acid solution, such as dilute sulfuric acid, onto the surface of natural marble. The main component of natural marble, calcium carbonate, reacts chemically with sulfuric acid to form very fine precipitates of calcium sulfate. This calcium sulfate adheres to the calcium carbonate, preventing further reaction between the calcium carbonate and sulfuric acid. Therefore, the sulfuric acid creates an uneven, non-slip surface on the natural stone. Acid washing typically produces random patterns on the stone surface, which is highly unsuitable for decorative applications with predetermined designs. Sandblasting uses abrasive materials such as angular corundum, quartz sand, or river sand, driven by compressed air or water, to impact the stone surface, achieving a frosted glass-like effect. Sandblasting can be used for stone products with specified designs, but its manual operation prevents mass production. Furthermore, both of these methods result in poor stain resistance after treatment, especially for light-colored stones, which can drastically reduce their usability. Summary of the Invention

[0003] To address the aforementioned problems, this invention provides a surface decoration treatment method that combines directional etching ink with marble slabs. This invention uses a special functional ink containing low-temperature frit to pre-penetrate and etch the marble slab, then inkjet prints it onto specific locations to match the pattern design, creating a recessed, relatively matte frosted effect in designated areas. The technical objective of this invention is achieved through the following technical solution:

[0004] This invention provides a surface decoration treatment method for combining directional etching ink with marble slabs. The surface decoration treatment method includes: applying a base glaze to the surface of a blank; inkjet printing conventional ceramic ink to form a natural stone design pattern on the surface of the blank after applying the base glaze; inkjet printing directional etching ink on the surface of the blank after inkjet printing conventional ceramic ink; applying a decorative glaze including a covering glaze to the surface of the blank after inkjet printing directional etching ink; and firing the glazed blank.

[0005] Preferably, the chemical composition of the base glaze includes, by mass percentage: IL: 3.0–4.0%, SiO2: 52–59%, Al2O3: 20–26%, CaO: 0.1–0.3%, MgO: 0.1–0.3%, K2O: 4.0–5.0%, Na2O: 1.8–3.2%, ZrO2: 5.0–7.0%.

[0006] Preferably, the base glaze is applied by spraying; the specific gravity of the base glaze is 1.40–1.50 g / cm³. 3 The application rate is 540–750 g / m³. 2 .

[0007] Preferably, the directional etching ink comprises a frit, an organic solvent, and a dispersant; the raw material composition of the frit comprises, by mass percentage: 45-66% potassium feldspar, 17-30% quartz, 4-6% sodium feldspar, 1-1.5% zinc oxide, 1.5-3% calcite, and 14-16% lead oxide.

[0008] Preferably, the organic solvent of the directional etching ink accounts for 120-230 wt% of the melt; and the dispersant of the directional etching ink accounts for 11-36 wt% of the melt.

[0009] Preferably, the grayscale of the pattern of the inkjet printing directional etching ink is 50-70%.

[0010] Preferably, the chemical composition of the covering glaze comprises, by mass percentage: IL: 8.5–11%, SiO2: 44–46%, Al2O3: 17–19%, CaO: 3.2–4.8%, BaO: 8.5–9.5%, MgO: 2.9–3.5%, K2O: 3.4–4.0%, Na2O: 2.0–3.0%, ZnO: 2.4–3.8%.

[0011] Preferably, the glaze further includes 15-25 wt% of printing paste and 40-50 wt% of printing oil in the covering glaze.

[0012] Preferably, the glaze is applied by screen printing; the specific gravity of the glaze is 1.60–1.70 g / cm³. 3 The application rate is 240–255 g / m³. 2 .

[0013] Preferably, the maximum firing temperature is 1220–1240 °C and the firing cycle is 50–60 min. Attached Figure Description

[0014] Figure 1 This is a rendering of the brick surface from Example 1. Detailed Implementation

[0015] The present invention is further illustrated by the following embodiments. It should be understood that the following embodiments are for illustrative purposes only and are not intended to limit the present invention. Unless otherwise specified, all percentage contents refer to mass percentage contents. The following exemplifies the surface decoration treatment method of combining directional etching ink with marble slabs according to the present invention.

[0016] Brick blanks are prepared. The blanks can be formed by dry pressing of the blank powder. The composition of the blank powder is not limited, and conventional ceramic brick blank powders in the art can be used. For example, the chemical composition of the blank powder includes, by mass percentage: SiO2: 63-65%, Al2O3: 19-22%, Fe2O3: 0.4-0.7%, TiO2: 0.25-0.35%, CaO: 0.25-0.35%, MgO: 0.5-0.8%, K2O: 2.0-2.4%, Na2O: 2.6-3.0%, and loss on ignition: 4.5-5.5%.

[0017] The body color can be matched to the colors of the pattern design. One or more colored powders are selected and pressed throughout the body to make the brick surface and body color basically consistent. The colored powders include the body powder and colorant mentioned above. Alternatively, through-body application, it can be matched with the inkjet pattern design to achieve a consistent effect inside and out.

[0018] Dry the brick blanks. The moisture content of the dried brick blanks should be controlled at 0.3-0.5 wt%. The drying time can be 50-60 minutes.

[0019] A base glaze is applied to the surface of the dried brick blank. This covers the base color and imperfections of the blank and promotes the color development of inkjet patterns. As an example, the chemical composition of the base glaze includes, by mass percentage: IL: 3.0–4.0%, SiO2: 52–59%, Al2O3: 20–26%, CaO: 0.1–0.3%, MgO: 0.1–0.3%, K2O: 4.0–5.0%, Na2O: 1.8–3.2%, ZrO2: 5.0–7.0%. The base glaze with the above chemical composition has good covering power, a wide firing range, and also facilitates the vibrant color development of inkjet inks.

[0020] When preparing the base glaze, corresponding raw materials are prepared according to the above-described chemical composition of the base glaze. It should be understood that any raw material that causes the chemical composition of the base glaze to fall within the above range can be used for the base glaze of the present invention. The raw materials are mixed with water, ball-milled, and sieved to obtain a glaze slurry of the base glaze. The fineness of the glaze slurry is such that the residue on a 325-mesh sieve reaches 0.6 to 1.0 wt%.

[0021] The base glaze is applied by spraying. The specific gravity of the base glaze is 1.40–1.50 g / cm³. 3 The application rate is 540–750 g / m³. 2 The base glaze has good moisture retention at this specific gravity, which makes the mirror finish of the glaze surface smoother.

[0022] A natural stone design pattern is created by inkjet printing conventional ceramic ink onto the surface of the ceramic body after the base glaze has been applied. A flat design pattern with dense textures is preferred, including but not limited to marble designs. For example, the texture of natural stone is selected and a matching vector pattern is designed, which is then stored in an inkjet printer. Computer software can be used to adjust the colors of the design. Printing can be multi-color or single-color inkjet printing.

[0023] A directional etching ink is prepared. The directional etching ink comprises a frit, an organic solvent, and a dispersant. The frit is a low-temperature frit. Preferably, the raw material composition of the frit includes, by mass percentage: 45-66% potassium feldspar, 17-30% quartz, 4-6% sodium feldspar, 1-1.5% zinc oxide, 1.5-3% calcite, and 14-16% lead oxide. The initial melting temperature of the frit is 650-800℃. Nano-potassium feldspar is preferred. For example, the size of nano-potassium feldspar is 50-100 nm. Nano-quartz is also preferred. For example, the size of nano-quartz is 50-100 nm. All raw materials of the frit are mixed uniformly, melted at 1300-1400℃ for 2.5-3 hours, and water-quenched to obtain the frit.

[0024] The chemical composition of the low-temperature fused block includes, by mass percentage: IL: 7.0–8.5%, SiO2: 28–40%, Al2O3: 8.0–12%, CaO: 0.6–1.2%, K2O: 7.2–10.5%, Na2O: 0.4–0.6%, ZnO: 1–1.5%, PbO: 14–16%.

[0025] The low-temperature frit contains oxides with strong fluxing effects, such as K₂O, Na₂O, PbO, and ZnO. It has a low initial melting point, significant firing shrinkage, and low surface tension, thus allowing the etching ink to create frosted depressions in localized textured areas of the brick surface. If the raw material composition of the low-temperature frit does not contain lead oxide, the etching effect will be weak, resulting in a poor textured surface.

[0026] The organic solvent in the directional etching ink accounts for 120–230 wt% of the fused mass; the dispersant in the directional etching ink accounts for 11–36 wt% of the fused mass. The organic solvent includes, but is not limited to, one or more of isopropanol, n-propyl acetate, 1,2-propanediol, polyols, and polyol ethers. Dispersants commonly used in the art can be used. The directional etching ink is obtained by uniformly mixing the fused mass, organic solvent, and dispersant. The directional etching ink exhibits good suspension and stability, meeting the requirements of inkjet printing.

[0027] Directional etching ink is then printed onto the surface of the ceramic blank after conventional inkjet printing. Patterns can be extracted at locations where a recessed effect is desired and generated as vector files. The amount of directional etching ink used is adjusted by controlling the grayscale of the inkjet pattern. In some technical solutions, the grayscale of the directional etching ink pattern is 50-70%. In multi-channel inkjet printing, the grayscale of the directional etching ink pattern refers to the grayscale of the inkjet pattern in each channel. If the grayscale of the directional etching ink pattern is too low, the gloss of the brick surface is low, the etching effect is poor, and it is difficult to create a raised or frosted effect. If the grayscale of the directional etching ink pattern is too high, it can easily lead to localized blistering of the glaze. For example, the grayscale of the directional etching ink pattern in dual-channel inkjet printing is independently controlled between 40-70% (preferably 50-70%).

[0028] The ratio of the number of channels for inkjet printing conventional ceramic ink to the number of channels for inkjet printing directional etching ink can be (4-8):1, which is more conducive to achieving a surface decoration effect. For example, at least 4 (preferably 4-8) channels are configured for inkjet printing conventional ceramic ink, and the last channel is configured for inkjet printing directional etching ink. In this way, the directional etching ink covers the conventional ceramic ink, promoting color development.

[0029] A decorative glaze is prepared. The decorative glaze comprises a covering glaze, ink paste comprising 15-25% by mass of the covering glaze, and ink oil comprising 40-50% by mass of the covering glaze. The chemical composition of the covering glaze comprises, by mass percentage: IL: 8.5-11%, SiO2: 44-46%, Al2O3: 17-19%, CaO: 3.2-4.8%, BaO: 8.5-9.5%, MgO: 2.9-3.5%, K2O: 3.4-4.0%, Na2O: 2.0-3.0%, ZnO: 2.4-3.8%. The above covering glaze, when matched with the etching ink, ensures a matte finish, depth, and texture at the etching ink location, while also providing a good surface feel and excellent anti-slip and abrasion resistance. The initial melting temperature of the covering glaze is 950-1050℃. If the temperature of the glaze is too high, the surface of the tile with the glaze will have a matte texture close to that of a frosted surface, making it difficult to contrast with the corroded areas.

[0030] All raw materials for the covering glaze are mixed with water, ball-milled, and sieved to obtain a glaze slurry. The covering glaze is required to pass completely through a 325-mesh sieve. As an example, the glaze comprises a covering glaze, a printing paste comprising 20% ​​of the covering glaze powder by mass, and printing ink comprising 45% of the covering glaze powder by mass. Both the printing paste and printing ink are commercially available.

[0031] A decorative glaze containing a covering glaze is applied to the surface of the blank after inkjet printing with directional etching ink. The glaze is applied by screen printing. The mesh count of the screen can be selected as needed. For example, the glaze can be printed using a 100-mesh screen.

[0032] Dry the glazed brick blanks. The drying temperature can be 150-200℃. The drying time can be 50-60 minutes.

[0033] The glazed body is then fired. The maximum firing temperature is 1220–1240℃, and the firing cycle is 50–60 minutes.

[0034] Graded packaging.

[0035] In summary, this invention uses a directional etching ink containing a low-temperature frit. This ink can fully melt with the base glaze and the overglaze, resulting in relatively large firing shrinkage and creating a low-gloss, matte effect in certain areas. Simultaneously, because the ink contains components that promote color development, the colors are vibrant in the areas where the directional etching ink is printed. Furthermore, due to the high gloss of the directional etching ink itself and its fluxing effect on the base glaze and overglaze, the amount of directional etching ink used can be controlled by designing the grayscale of the inkjet-printed pattern, resulting in a product with excellent gloss gradation and texture. The product of this invention has a brick surface gloss of 10-25 degrees, with the gloss of the etched areas being 6-10 degrees. A recessed matte effect is created in specific areas, and the recessed texture highly matches the designed pattern, making the effect appear more natural.

[0036] The following examples further illustrate the present invention in detail. It should also be understood that the following examples are only for further explanation of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-essential improvements and adjustments made by those skilled in the art based on the above description of the present invention are within the scope of protection of the present invention. The specific process parameters, etc., in the following examples are merely examples within a suitable range; that is, those skilled in the art can make appropriate selections within the appropriate range based on the description herein, and are not intended to be limited to the specific values ​​in the examples below.

[0037] Example 1

[0038] The surface decoration treatment method for combining directional etching ink with marble slabs includes the following steps:

[0039] Step 1. Use the blank powder to dry press to obtain brick blanks and then dry the brick blanks.

[0040] Step 2. Apply a base glaze to the dried brick surface. The chemical composition of the base glaze includes, by mass percentage: IL: 3.5%, SiO2: 57.41%, Al2O3: 25%, CaO: 0.27%, MgO: 0.22%, K2O: 4.6%, Na2O: 2.7%, ZrO2: 6.3%. The base glaze is applied by spraying. The specific gravity of the base glaze is 1.45 g / cm³. 3 The application rate is 625 g / m 2 .

[0041] Step 3. After applying the base glaze, inkjet print conventional ceramic ink onto the surface of the brick blank to form a multi-color inkjet print of natural stone design patterns.

[0042] Step 4. Apply directional etching ink using a dual-channel inkjet printer to the surface of the brick blank after the multi-color inkjet-printed natural stone design pattern has been formed. The directional etching ink consists of a frit, an organic solvent, and a dispersant. The frit composition includes, by mass percentage: 53% potassium feldspar, 25% quartz, 5% sodium feldspar, 1% zinc oxide, 2% calcite, and 14% lead oxide. The organic solvent (specifically a mixture of isopropanol, n-propyl acetate, and 1,2-propanediol in a volume ratio of 1:1:1) accounts for 180 wt% of the frit, and the dispersant accounts for 23 wt% of the frit. The grayscale of each channel of the directional etching ink printed using the dual-channel inkjet printer is 60%.

[0043] Step 5. Apply a decorative glaze containing a cover glaze to the surface of the preform after inkjet printing with directional etching ink. The decorative glaze comprises a cover glaze, 20 wt% printing paste of the cover glaze powder, and 45 wt% printing oil of the cover glaze. The chemical composition of the cover glaze is as follows (by weight percentage): IL: 10.3%, SiO2: 46%, Al2O3: 17%, CaO: 4.6%, BaO: 8.8%, MgO: 3.2%, K2O: 3.8%, ZnO: 3.6%, Na2O: 2.7%.

[0044] Step 6. Dry and fire the glazed brick blanks. The maximum firing temperature is 1230℃, and the firing time is 55 minutes.

[0045] The product prepared in Example 1 has a brick surface gloss of 12 degrees and a gloss of 7 degrees on the etched part. A downward-recessed frosted effect is formed on the specific part where the directional etching ink is applied. At the same time, the recessed texture is highly matched with the design pattern, making the effect appear more natural.

[0046] Example 2

[0047] The surface decoration treatment method for combining directional etching ink with marble slabs includes the following steps:

[0048] Step 1. Use the blank powder to dry press to obtain brick blanks and then dry the brick blanks.

[0049] Step 2. Apply a base glaze to the dried brick surface. The chemical composition of the base glaze includes, by mass percentage: IL: 3.5%, SiO2: 57.41%, Al2O3: 25%, CaO: 0.27%, MgO: 0.22%, K2O: 4.6%, Na2O: 2.7%, ZrO2: 6.3%. The base glaze is applied by spraying. The specific gravity of the base glaze is 1.45 g / cm³. 3 The application rate is 625 g / m 2 .

[0050] Step 3. After applying the base glaze, inkjet print conventional ceramic ink onto the surface of the brick blank to form a multi-color inkjet print of natural stone design patterns.

[0051] Step 4. Apply directional etching ink using a dual-channel inkjet printer to the surface of the brick blank after the multi-color inkjet-printed natural stone design pattern has been formed. The directional etching ink consists of a frit, an organic solvent, and a dispersant. The frit composition includes, by mass percentage: 53% potassium feldspar, 25% quartz, 5% sodium feldspar, 1% zinc oxide, 2% calcite, and 14% lead oxide. The organic solvent (specifically a mixture of isopropanol, n-propyl acetate, and 1,2-propanediol in a volume ratio of 1:1:1) accounts for 180 wt% of the frit, and the dispersant accounts for 23 wt% of the frit. The grayscale of each channel of the directional etching ink printed using the dual-channel inkjet printer is 60%.

[0052] Step 5. Apply a decorative glaze containing a cover glaze to the surface of the preform after inkjet printing with directional etching ink. The decorative glaze comprises a cover glaze, 20 wt% ink paste (based on the cover glaze powder), and 45 wt% ink (based on the cover glaze). The chemical composition of the cover glaze is as follows (by mass percentage): IL: 11%, SiO2: 45.2%, Al2O3: 19%, CaO: 3.6%, BaO: 9.2%, MgO: 3.0%, K2O: 3.5%, ZnO: 3.1%, Na2O: 2.4%.

[0053] Step 6. Dry and fire the glazed brick blanks. The maximum firing temperature is 1230℃, and the firing time is 55 minutes.

[0054] The product prepared in Example 2 has a brick surface gloss of 23 degrees and a gloss of 9 degrees on the etched part. A downward-recessed frosted effect is formed on the specific part where the directional etching ink is applied. At the same time, the recessed texture is highly matched with the design pattern, making the effect appear more natural.

[0055] Comparative Example 1

[0056] The surface decoration treatment method for combining directional etching ink with marble slabs includes the following steps:

[0057] Step 1. Use the blank powder to dry press to obtain brick blanks and then dry the brick blanks.

[0058] Step 2. Apply a base glaze to the dried brick surface. The chemical composition of the base glaze includes, by mass percentage: IL: 3.5%, SiO2: 57.41%, Al2O3: 25%, CaO: 0.27%, MgO: 0.22%, K2O: 4.6%, Na2O: 2.7%, ZrO2: 6.3%. The base glaze is applied by spraying. The specific gravity of the base glaze is 1.45 g / cm³. 3 The application rate is 625 g / m 2 .

[0059] Step 3. After applying the base glaze, inkjet print conventional ceramic ink onto the surface of the brick blank to form a multi-color inkjet print of natural stone design patterns.

[0060] Step 4. Apply directional etching ink using a dual-channel inkjet printer to the surface of the brick blank after the multi-color inkjet-printed natural stone design pattern has been formed. The directional etching ink consists of a frit, an organic solvent, and a dispersant. The frit's raw material composition includes, by mass percentage: 53% potassium feldspar, 25% quartz, 5% sodium feldspar, 1% zinc oxide, 2% calcite, and 14% lead oxide. The organic solvent (specifically a mixture of isopropanol, n-propyl acetate, and 1,2-propanediol in a volume ratio of 1:1:1) accounts for 180 wt% of the frit, and the dispersant accounts for 23 wt% of the frit. The grayscale of each channel of the directional etching ink printed using the dual-channel inkjet printer is 20%.

[0061] Step 5. Apply a decorative glaze containing a cover glaze to the surface of the preform after inkjet printing with directional etching ink. The decorative glaze comprises a cover glaze, 20 wt% printing paste of the cover glaze powder, and 45 wt% printing oil of the cover glaze. The chemical composition of the cover glaze is as follows (by weight percentage): IL: 10.3%, SiO2: 46%, Al2O3: 17%, CaO: 4.6%, BaO: 8.8%, MgO: 3.2%, K2O: 3.8%, ZnO: 3.6%, Na2O: 2.7%.

[0062] Step 6. Dry and fire the glazed brick blanks. The maximum firing temperature is 1230℃, and the firing time is 55 minutes.

[0063] Because the pattern grayscale of the dual-channel inkjet directional etching ink in Comparative Example 1 is low, the resulting product does not show obvious recessed effects in the areas where the inkjet directional etching ink is printed. At the same time, the matte frosting effect is poor, and it is impossible to form a contrast between glossy and matte.

[0064] Comparative Example 2

[0065] The surface decoration treatment method for combining directional etching ink with marble slabs includes the following steps:

[0066] Step 1. Use the blank powder to dry press to obtain brick blanks and then dry the brick blanks.

[0067] Step 2. Apply a base glaze to the dried brick surface. The chemical composition of the base glaze includes, by mass percentage: IL: 3.5%, SiO2: 57.41%, Al2O3: 25%, CaO: 0.27%, MgO: 0.22%, K2O: 4.6%, Na2O: 2.7%, ZrO2: 6.3%. The base glaze is applied by spraying. The specific gravity of the base glaze is 1.45 g / cm³. 3 The application rate is 625 g / m 2 .

[0068] Step 3. After applying the base glaze, inkjet print conventional ceramic ink onto the surface of the brick blank to form a multi-color inkjet print of natural stone design patterns.

[0069] Step 4. Apply directional etching ink using a dual-channel inkjet printer to the surface of the brick blank after the multi-color inkjet-printed natural stone design pattern has been formed. The directional etching ink consists of a frit, an organic solvent, and a dispersant. The frit's raw material composition includes, by mass percentage: 53% potassium feldspar, 25% quartz, 5% sodium feldspar, 1% zinc oxide, 2% calcite, and 14% lead oxide. The organic solvent (specifically a mixture of isopropanol, n-propyl acetate, and 1,2-propanediol in a volume ratio of 1:1:1) accounts for 180 wt% of the frit, and the dispersant accounts for 23 wt% of the frit. The grayscale of each channel of the directional etching ink printed using the dual-channel inkjet printer is 20%.

[0070] Step 5. Apply a decorative glaze containing a cover glaze to the surface of the preform after inkjet printing with directional etching ink. The decorative glaze comprises a cover glaze, 20 wt% ink paste (based on the cover glaze powder), and 45 wt% ink (based on the cover glaze). The chemical composition of the cover glaze is as follows (by weight percentage): IL: 10.64%, SiO2: 42%, Al2O3: 20%, CaO: 5.5%, BaO: 11%, MgO: 3.0%, K2O: 2.6%, ZnO: 3.1%, Na2O: 2.0%, Fe2O3: 0.16%.

[0071] Step 6. Dry and fire the glazed brick blanks. The maximum firing temperature is 1230℃, and the firing time is 55 minutes.

[0072] The brick surface gloss of Comparative Example 2 is about 8 degrees. The gloss of the overall glaze is low. After being corroded, it is difficult to form a gloss contrast and the frosted effect cannot be achieved.

Claims

1. A surface decoration treatment method for combining directional etching ink with marble slabs, characterized in that, The surface decoration treatment method includes: applying a base glaze to the surface of the blank; inkjet printing conventional ceramic ink to form a natural stone design pattern on the blank surface after applying the base glaze; and inkjet printing directional etching ink on the blank surface after inkjet printing conventional ceramic ink. The directional etching ink comprises frit, organic solvent, and dispersant. The raw material composition of the frit includes, by mass percentage: 45%–66% potassium feldspar, 17%–30% quartz, 4%–6% sodium feldspar, 1%–1.5% zinc oxide, 1.5%–3% calcite, and 14%–1% lead oxide. 6%; a process of applying a decorative glaze containing a covering glaze to the surface of a blank after inkjet printing directional etching ink; the chemical composition of the covering glaze includes, by mass percentage: IL: 8.5%–11%, SiO2: 44%–46%, Al2O3: 17%–19%, CaO: 3.2%–4.8%, BaO: 8.5%–9.5%, MgO: 2.9%–3.5%, K2O: 3.4%–4.0%, Na2O: 2.0%–3.0%, ZnO: 2.4%–3.8%; and a process of firing the blank after applying the decorative glaze.

2. The surface decoration treatment method according to claim 1, characterized in that, The chemical composition of the base glaze includes, by mass percentage: IL: 3.0%–4.0%, SiO2: 52%–59%, Al2O3: 20%–26%, CaO: 0.1%–0.3%, MgO: 0.1%–0.3%, K2O: 4.0%–5.0%, Na2O: 1.8%–3.2%, ZrO2: 5.0%–7.0%.

3. The surface decoration treatment method according to claim 1, characterized in that, The base glaze is applied by spraying; the specific gravity of the base glaze is 1.40–1.50 g / cm³. 3 The application rate is 540–750 g / m³. 2 .

4. The surface decoration treatment method according to claim 1, characterized in that, The organic solvent of the directional etching ink accounts for 120-230 wt% of the melt; the dispersant of the directional etching ink accounts for 11-36 wt% of the melt.

5. The surface decoration treatment method according to claim 1, characterized in that, The grayscale of the pattern printed by inkjet printing directional etching ink is 50% to 70%.

6. The surface decoration treatment method according to claim 1, characterized in that, The glaze also includes 15-25 wt% of printing paste and 40-50 wt% of printing oil.

7. The surface decoration treatment method according to claim 1, characterized in that, The glaze is applied by screen printing; the specific gravity of the glaze is 1.60–1.70 g / cm³. 3 The application rate is 240–255 g / m³. 2 .

8. The surface decoration treatment method according to claim 1, characterized in that, The maximum firing temperature is 1220–1240 °C, and the firing cycle is 50–60 min.

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