Antifouling strontium silicate ceramic tile and preparation method thereof

Abstract

This invention discloses a stain-resistant strontium silicate ceramic tile and its preparation method, relating to the field of ceramic technology. The ceramic tile comprises a ceramic tile body, a base glaze layer, a decorative pattern layer, and a strontium silicate stain-resistant transparent glaze layer. The preparation method includes preparing the tile body, applying the base glaze, inkjet printing, applying a stain-resistant transparent glaze slurry containing strontium silicate functional material or a strontium silicate composite functional material, and firing in a roller kiln. This invention can improve the dispersion stability of functional materials in the transparent glaze slurry, reduce pinholes, micropores, and roughness defects on the glaze surface, and improve the stain-resistant performance and stain-resistant retention after cleaning of the ceramic tile.

Description

Technical Field

[0001] This invention relates to the field of ceramic technology, and in particular to a stain-resistant strontium silicate ceramic brick and its preparation method. Background Technology

[0002] Ceramic tiles are widely used in residential, commercial, kitchen and bathroom, and public buildings. With increasing demands, ceramic tiles not only need to possess good decorative effects, surface transparency, and pattern clarity, but also require good stain resistance, ease of cleaning, and stain retention after washing. Especially in kitchens, bathrooms, and public areas, the surface of ceramic tiles is easily exposed to contaminants such as tea, coffee, soy sauce, ink, and oil. If the glaze has micropores, pinholes, or small depressions, these contaminants can easily penetrate and remain, affecting long-term performance.

[0003] CN112592059A discloses a high-transparency, stain-resistant fully polished glaze and a method for preparing glazed tiles using the same. This method improves the bubble removal process during glaze firing by introducing components such as feldspar, quartz, calcite, dolomite, wollastonite, calcined talc, barium carbonate, strontium carbonate, zinc oxide, and kaolin into the fully polished glaze formula, thereby enhancing the glaze's transparency and post-polishing stain resistance. CN111548016A discloses a matte protective glaze for thin ceramic tiles with a gloss level below 3, thin ceramic tiles, and a method for preparing the same. This method controls the silica-alumina ratio of the matte protective glaze and introduces high-temperature matte frit, strontium carbonate, and barium carbonate, causing strontium feldspar and barium feldspar crystals to precipitate in the glaze layer after firing, thus achieving a balance of low gloss, stain resistance, and wear resistance. CN114988919A discloses an ultra-white transparent glaze ceramic tile and its preparation method, which improves the stain resistance, color difference, and surface decoration effect of ceramic tiles by using a transparent glaze with high whiteness and an easy-to-clean frit. The aforementioned prior art mainly improves the transparency and stain resistance of ceramic tiles by adjusting the formula of the transparent glaze and protective glaze, or by introducing components such as strontium carbonate, barium carbonate, and easy-to-clean frit. However, uneven distribution during firing can lead to pinholes, micropores, fogging, or localized roughness defects on the glaze surface. Existing solutions often struggle to simultaneously achieve glaze transparency, stain resistance, and stain resistance retention after cleaning. Solutions using organic anti-fouling agents or post-treatment coatings have limited scrub resistance, and their anti-fouling effect tends to diminish over long-term use. Therefore, there is an urgent need for a stain-resistant strontium silicate ceramic tile and its preparation method that can improve the dispersion stability of functional materials, reduce micro-defects on the glaze surface, and improve long-term stain resistance retention. Summary of the Invention

[0004] In view of the problems in existing technologies, such as the numerous micropores and small depressions on the surface of ordinary transparent glazed ceramic tiles, the ease with which contaminants can remain, and the tendency for strontium silicate functional materials to agglomerate, settle, or locally accumulate when directly added to transparent glaze slurry, resulting in pinholes, micropores, and roughness on the glaze surface after firing and affecting its anti-fouling properties, this invention provides an anti-fouling strontium silicate ceramic tile and its preparation method. This ceramic tile improves the dispersion stability of the functional materials in the transparent glaze slurry and the density of the glaze layer after firing by introducing strontium silicate functional materials into the transparent glaze layer and further employing strontium silicate composite functional materials. Furthermore, it further reduces pinholes and micropores on the glaze surface by synergistically constructing an interface-induced structure using 2-phosphonobutane-1,2,4-tricarboxylic acid tetrasodium salt, zirconium carbonate ammonium, and ammonium-type silicotungstic acid tungstate, thereby improving the anti-fouling performance and anti-fouling retention of the ceramic tile after cleaning.

[0005] To achieve the above objectives, the present invention provides a stain-resistant strontium silicate ceramic tile, which includes a ceramic tile body, a base glaze layer disposed on the surface of the ceramic tile body, a pattern decoration layer disposed on the surface of the base glaze layer, and a strontium silicate stain-resistant transparent glaze layer covering the outside of the pattern decoration layer.

[0006] The present invention also provides a method for preparing a stain-resistant strontium silicate ceramic brick.

[0007] A method for preparing a stain-resistant strontium silicate ceramic brick includes the following steps: Step 1: Prepare ceramic brick body powder, press the body powder into shape, and dry it to obtain ceramic brick body; Step 2: Prepare the base glaze slurry and apply it to the surface of the ceramic tile body to form a base glaze layer; Step 3: Inkjet printing is performed on the surface of the base glaze layer to form a decorative pattern layer; Step 4: Prepare a strontium silicate antifouling transparent glaze paste containing strontium silicate functional material or strontium silicate composite functional material, and apply the strontium silicate antifouling transparent glaze paste to the outside of the pattern decoration layer to form a strontium silicate antifouling transparent glaze layer. Step 5: The glazed brick blanks are sent into a roller kiln for firing. After firing, they are cooled, ground, and graded to obtain anti-fouling strontium silicate ceramic bricks.

[0008] The ceramic brick body powder mentioned in step 1, by weight, includes: 28-36 parts of potassium sodium feldspar, 15-21 parts of kaolin, 12-16 parts of ball clay, 16-24 parts of quartz, 8-14 parts of porcelain stone, 2-4 parts of talc, and 1-3 parts of bentonite; and 0.15-0.35% sodium tripolyphosphate and 0.1-0.2% water glass are added for wet ball milling; after ball milling, the fineness of the slurry is controlled to be 0.5-1.2% residue on a 325-mesh sieve, and the slurry moisture content is 34-38%; the moisture content of the body powder obtained after spray drying is 6-8%; the molding pressure of the body powder is 30-40 MPa, the drying temperature is 170-210℃, and the moisture content of the dried body is not higher than 0.5 wt%.

[0009] The base glaze slurry mentioned in step 2 comprises, by weight: 25-32 parts potassium-sodium feldspar, 10-14 parts quartz, 10-14 parts calcined kaolin, 8-12 parts zirconium silicate, 18-26 parts transparent frit, 6-10 parts wollastonite, 2-4 parts alumina, 2-4 parts talc, 0.1-0.2 parts sodium carboxymethyl cellulose, and 0.15-0.35 parts sodium tripolyphosphate; the base glaze slurry, after ball milling, has a fineness controlled to 0.4-0.8% residue on a 325-mesh sieve, and a specific gravity controlled to 1.75-1.83 g / cm³. 3 The flow rate is controlled at 25-35 seconds; the amount of base glaze applied to the surface of the ceramic tile body is 450-550 g / m². 2 .

[0010] In step 3, after inkjet printing on the surface of the base glaze layer, the brick blank is sent to the drying section for pre-drying. The pre-drying temperature is 90-120℃, so that there is no obvious free water on the surface of the pattern decoration layer.

[0011] The strontium silicate antifouling transparent glaze paste mentioned in step 4 comprises, by weight: 58-66 parts transparent frit, 8-12 parts potassium sodium feldspar, 5-9 parts quartz powder, 4-8 parts calcined kaolin, 4-6 parts wollastonite, 1-3 parts calcined alumina, 3-7 parts strontium silicate functional material or strontium silicate composite functional material, 0.08-0.16 parts sodium carboxymethyl cellulose, 0.15-0.35 parts sodium tripolyphosphate, 0.05-0.12 parts sodium polyacrylate, and 90-110 parts water. In step 4, the strontium silicate functional material or strontium silicate composite functional material, sodium tripolyphosphate, sodium polyacrylate, and a portion of water are pre-dispersed, and then ball-milled together with the remaining transparent glaze raw materials. The amount of water used for pre-dispersion accounts for 25-40% of the total water added in step 4, and the pre-dispersion time is 20-35 minutes. After ball milling, the fineness of the transparent glaze slurry is controlled to be 0.1-0.3% residue on a 325-mesh sieve, and the specific gravity is controlled to be 1.38-1.46 g / cm³. 3 The flow rate is controlled at 18-28s.

[0012] The strontium silicate functional material mentioned in step 4, calculated by mass percentage of oxides, comprises: SrO 34-39%, SiO2 42-54%, Al2O3 0.8-3%, CaO 2.5-8.5%, SO3 3-7.5%, MgO 0.1-0.8%, Fe2O3 0.3-1.2%, K2O 0.3-1.2%, Na2O 0.05-1%, BaO 0.1-1%, with the balance being unavoidable impurities and loss on ignition; the loss on ignition is the mass loss measured under ignition conditions at 1025℃. The strontium silicate functional material has a D50 particle size of 2.5-5μm, a moisture content not exceeding 0.5wt%, and a residue on a 325-mesh sieve not exceeding 0.3wt%.

[0013] The strontium silicate composite functional material is prepared by the following method: strontium silicate functional material, sodium polyacrylate, sodium tripolyphosphate and complexing dispersant are added to water and dispersed to obtain strontium silicate pre-dispersion slurry; tungsten source, strontium source and cerium source are added to the strontium silicate pre-dispersion slurry to allow the tungsten source, strontium source and cerium source to be adsorbed and deposited on the surface of strontium silicate functional material; then spray dried, calcined, lightly ball-milled and classified to obtain strontium silicate composite functional material.

[0014] The complexing and dispersing agent is at least one of citric acid and tetrasodium 2-phosphonobutane-1,2,4-tricarboxylic acid. In the preparation process of the strontium silicate composite functional material, 100 parts by weight of strontium silicate functional material, 0.15-0.35 parts by weight of sodium polyacrylate, 0.1-0.3 parts by weight of sodium tripolyphosphate, and 0.08-0.25 parts by weight of complexing and dispersing agent are added to 80-100 parts by weight of water and dispersed at 1000-1500 r / min for 20-40 min to obtain strontium silicate pre-dispersion slurry.

[0015] In the preparation process of the strontium silicate composite functional material, silicotungstic acid hydrate is dissolved in water, and the pH value is adjusted to 7-7.5 with ammonia water to obtain an ammonium silicotungstic acid solution; the ammonium silicotungstic acid solution is mixed with a zirconium ammonium carbonate solution, and the pH value is adjusted to 8-8.4 to obtain a zirconium-silicotungstic acid composite interface liquid; then the zirconium-silicotungstic acid composite interface liquid is added to the strontium silicate pre-dispersion slurry and stirred for 20-40 min to form a zirconium phosphine carboxylic acid-silicotungstic acid composite complex adsorption layer.

[0016] The amount of silicotungstic acid hydrate added is 0.60-1.4 parts by mass based on WO3, and the amount of zirconium carbonate ammonium solution added is 0.2-0.5 parts by mass based on ZrO2; the tungsten source is ammonium metatungstate hydrate, and the amount of ammonium metatungstate hydrate added is 1.8-3.2 parts by mass based on WO3; the strontium source is strontium nitrate, and the amount of strontium nitrate added is 1-1.8 parts by mass based on SrO; the cerium source is cerium nitrate hexahydrate, and the amount of cerium nitrate hexahydrate added is 0.05-0.15 parts by mass based on CeO2.

[0017] Tungsten source solution, strontium nitrate solution, and cerium nitrate solution were added to a strontium silicate pre-dispersion slurry containing a zirconium phosphine carboxylic acid-silicotungstic acid composite complex adsorption layer. During the addition process, the pH value of the slurry was controlled to be 8-8.6. After the addition was completed, stirring was continued for 40-80 min. The resulting slurry was then spray-dried at an inlet air temperature of 170-190℃ and an outlet air temperature of 80-100℃ to obtain a composite precursor powder. The composite precursor powder was calcined at 760-800℃ for 1.5-2.5 h, cooled in the furnace, and then lightly ball-milled and classified to obtain a strontium silicate composite functional material.

[0018] In step 5, the strontium silicate anti-fouling transparent glaze is applied to the outer side of the patterned decorative layer by means of glazing or spraying, with an application amount of 130-180 g / m². 2 After glazing, the brick blanks are dried at 100-130℃ for 3-8 minutes; the dried brick blanks are then sent to a roller kiln for firing, with a maximum firing temperature of 1190-1220℃, a firing cycle of 48-65 minutes, and a holding time of 4-8 minutes.

[0019] Strontium silicate functional materials can participate in the glass phase structure regulation during the firing process of transparent glaze, thereby improving the density of the glaze surface. Strontium silicate composite functional materials can improve the problems of agglomeration, sedimentation and local enrichment of ordinary strontium silicate functional materials in transparent glaze slurry. Tetrasodium 2-phosphonobutane-1,2,4-tricarboxylate, ammonium zirconium carbonate and ammonium silicotungstate can synergistically construct the interface-induced structure, improve the adhesion uniformity of cerium-doped strontium tungstate microcrystalline phase on the surface of strontium silicate functional materials, thereby reducing pinholes, micropores and roughness defects on the glaze surface after firing, and improving the anti-fouling performance of ceramic tiles and the retention of anti-fouling properties after cleaning.

[0020] By pre-forming a zirconium-silicon-tungsten composite interfacial liquid with ammonium zirconium carbonate and ammonium-type silicotungstenate, and simultaneously introducing it into the strontium silicate pre-dispersion slurry in the presence of tetrasodium 2-phosphonobutane-1,2,4-tricarboxylate, the zirconium source and silicotungsten ions are co-adsorbed on the surface of the strontium silicate functional material. This avoids the separate hydrolysis of the zirconium source, migration of silicotungsten ions, or formation of free strontium tungstate grains caused by local concentration differences when the two are added stepwise. This improves the uniformity of in-situ adhesion of the cerium-doped strontium tungstate microcrystalline phase on the surface of the strontium silicate powder, reduces fogging, pinholes, and micropore defects after firing the transparent glaze, and improves the anti-fouling properties of the glaze.

[0021] The beneficial effects of this invention are: 1. This invention introduces strontium silicate functional material into the transparent glaze layer of ceramic tiles, so that the strontium silicate functional material participates in the adjustment of the glass phase structure of the transparent glaze during the firing process, reduces micropores and small depressions on the glaze surface, improves the density of the glaze surface, and thus reduces the residue of contaminants such as ink in the micro-defects of the glaze surface.

[0022] 2. Compared with the prior art, the anti-fouling strontium silicate ceramic tile obtained by the present invention has lower glaze roughness, fewer pinholes, and better ink anti-fouling performance and anti-fouling retention after wiping. It is suitable for ceramic tile products with high requirements for surface transparency, anti-fouling and easy cleaning. Detailed Implementation

[0023] The endpoints and any values ​​of the ranges disclosed in this invention are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed in this invention.

[0024] The water glass is industrial-grade liquid sodium silicate water glass, model 3.2 modulus / 40°Bé, with a Baumé degree of 40°Bé at 25°C and a SiO2 / Na2O molar ratio of 3.25. The transparent frit, by mass percentage of oxides, comprises: SiO2 58.5%, Al2O3 8%, CaO 10%, MgO 2%, K2O 4.5%, Na2O 4%, ZnO 4.5%, B2O3 6.2%, ZrO2 1%, BaO 1%, Fe2O3 0.05%, TiO2 0.05%, with the balance being unavoidable impurities; The quartz powder was purchased from Shijiazhuang Borui Building Materials Co., Ltd., and its specification is 325 mesh. Calcined kaolin was purchased from Guangdong Yuanlei Powder Co., Ltd., with a specification of 1250 mesh. The kaolin was purchased from Longyan Kaolin Co., Ltd., and the specification was 325 mesh kaolin concentrate. The sodium polyacrylate is PAAS powder produced by Shandong Taihe Technology Co., Ltd., with a solid content of not less than 90wt% and a pH value of 6-8 for a 1% aqueous solution. The strontium silicate functional material comprises, by oxide mass percentage: SrO 37.74%, SiO2 43.84%, Al2O3 1.41%, CaO 7.66%, SO3 6.76%, MgO 0.22%, Fe2O3 0.7%, K2O 0.72%, Na2O 0.1%, BaO 0.27%, loss on ignition 0.29%, and the balance being unavoidable impurities; the loss on ignition is the mass loss measured by the sample under ignition conditions at 1025℃; the strontium silicate functional material has a particle size D50 of 3.5μm, a moisture content of 0.3wt%, and a residue of 0.2wt% on a 325-mesh sieve.

[0025] Other raw materials not mentioned are all common raw materials. The above content is only for the purpose of illustrating the present invention and should not be construed as a strict limitation of the present invention. Those skilled in the art can directly purchase the same / similar raw materials from the market or prepare them themselves.

[0026] Unless otherwise stated, the amounts of ammonium metatungstate hydrate and silicotungstic acid hydrate added in this invention are calculated based on WO3, the amount of strontium nitrate added is calculated based on SrO, the amount of cerium nitrate hexahydrate added is calculated based on CeO2, and the amount of zirconium carbonate ammonium solution added is calculated based on ZrO2. The actual weighed mass can be determined by conversion based on the purity, water of crystallization content, or effective ingredient content of the raw materials used.

[0027] The technical solutions of the present invention will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Example 1

[0029] A method for preparing a stain-resistant strontium silicate ceramic brick includes the following steps: Step 1: By weight, take 32 parts of potassium feldspar, 18 parts of kaolin, 14 parts of ball clay, 20 parts of quartz, 11 parts of porcelain stone, 3 parts of talc, and 2 parts of bentonite. Add 0.25% sodium tripolyphosphate and 0.15% water glass by weight of the dry materials, then add water and perform wet ball milling. After ball milling, the fineness of the slurry is controlled to be 0.8% residue on a 325-mesh sieve, and the slurry moisture content is 36%. Spray dry the obtained slurry to obtain body powder, and control the moisture content of the powder to 7%. Press the body powder into shape at a molding pressure of 35 MPa to obtain wet ceramic brick blanks. Then send the wet ceramic brick blanks into a drying kiln for drying at a drying temperature of 190℃. After drying, the moisture content of the blanks is 0.35 wt%. Step 2: By weight, take 28 parts potassium-sodium feldspar, 12 parts quartz, 12 parts calcined kaolin, 10 parts zirconium silicate, 22 parts transparent frit, 8 parts wollastonite, 3 parts alumina, 3 parts talc, 0.15 parts sodium carboxymethyl cellulose, and 0.25 parts sodium tripolyphosphate. Add water and ball mill to obtain a base glaze slurry. The fineness of the base glaze slurry should be controlled to 0.6% residue on a 325-mesh sieve, and the specific gravity should be controlled to 1.79 g / cm³. 3 The flow rate is controlled at 30 seconds. The base glaze slurry is applied to the surface of the dried ceramic tile body, with a glaze application rate of 500 g / m². 2 This forms the base glaze layer; Step 3: Inkjet printing is performed on the surface of the base glaze layer to form a patterned decorative layer. After inkjet printing, the brick blank is sent to the drying section for pre-drying at a temperature of 105℃ to ensure that there is no obvious free water on the surface of the patterned decorative layer. Step 4: By weight, take 62 parts transparent frit, 10 parts potassium-sodium feldspar, 7 parts quartz powder, 6 parts calcined kaolin, 5 parts wollastonite, 2 parts calcined alumina, 5 parts strontium silicate functional material, 0.12 parts sodium carboxymethyl cellulose, 0.25 parts sodium tripolyphosphate, 0.08 parts sodium polyacrylate, and 100 parts water to prepare a strontium silicate antifouling transparent glaze slurry. First, pre-disperse the strontium silicate functional material with sodium tripolyphosphate, sodium polyacrylate, and 35 parts water for 25 minutes. Then, mix it evenly with the remaining transparent glaze raw materials and the remaining water, and ball mill it. After ball milling, the fineness of the transparent glaze slurry is controlled to be 0.2% residue on a 325-mesh sieve, and the specific gravity is controlled to be 1.42 g / cm³. 3 The flow rate was controlled at 23s to obtain a strontium silicate antifouling transparent glaze slurry; Step 5: Apply the strontium silicate anti-fouling transparent glaze to the outer side of the patterned decorative layer by a glazing method, with an application rate of 155 g / m². 2 A strontium silicate anti-fouling transparent glaze layer is formed. After glazing, the brick blank is dried at 115℃ for 5 minutes. The glazed brick blank is then sent to a roller kiln for firing. The maximum firing temperature is 1205℃, the firing cycle is 56 minutes, and the holding time is 6 minutes. After firing, the brick blank is cooled, edged, and graded to obtain anti-fouling strontium silicate ceramic brick.

[0030] Example 2

[0031] A method for preparing a stain-resistant strontium silicate ceramic brick includes the following steps: Step 1: By weight, take 32 parts of potassium feldspar, 18 parts of kaolin, 14 parts of ball clay, 20 parts of quartz, 11 parts of porcelain stone, 3 parts of talc, and 2 parts of bentonite. Add 0.25% sodium tripolyphosphate and 0.15% water glass by weight of the dry materials, then add water and perform wet ball milling. After ball milling, the fineness of the slurry is controlled to be 0.8% residue on a 325-mesh sieve, and the slurry moisture content is 36%. Spray dry the obtained slurry to obtain body powder, and control the moisture content of the powder to 7%. Press the body powder into shape at a molding pressure of 35 MPa to obtain wet ceramic brick blanks. Then send the wet ceramic brick blanks into a drying kiln for drying at a drying temperature of 190℃. After drying, the moisture content of the blanks is 0.35 wt%. Step 2: By weight, take 28 parts potassium-sodium feldspar, 12 parts quartz, 12 parts calcined kaolin, 10 parts zirconium silicate, 22 parts transparent frit, 8 parts wollastonite, 3 parts alumina, 3 parts talc, 0.15 parts sodium carboxymethyl cellulose, and 0.25 parts sodium tripolyphosphate. Add water and ball mill to obtain a base glaze slurry. The fineness of the base glaze slurry should be controlled to 0.6% residue on a 325-mesh sieve, and the specific gravity should be controlled to 1.79 g / cm³. 3 The flow rate is controlled at 30 seconds. The base glaze slurry is applied to the surface of the dried ceramic tile body, with a glaze application rate of 500 g / m². 2 This forms the base glaze layer; Step 3: Inkjet printing is performed on the surface of the base glaze layer to form a patterned decorative layer. After inkjet printing, the brick blank is sent to the drying section for pre-drying at a temperature of 105℃ to ensure that there is no obvious free water on the surface of the patterned decorative layer. Step 4: By weight, take 62 parts transparent frit, 10 parts potassium-sodium feldspar, 7 parts quartz powder, 6 parts calcined kaolin, 5 parts wollastonite, 2 parts calcined alumina, 5 parts strontium silicate composite functional material, 0.12 parts sodium carboxymethyl cellulose, 0.25 parts sodium tripolyphosphate, 0.08 parts sodium polyacrylate, and 100 parts water to prepare a strontium silicate antifouling transparent glaze slurry. First, pre-disperse the strontium silicate composite functional material with sodium tripolyphosphate, sodium polyacrylate, and 35 parts water for 25 minutes. Then, mix it evenly with the remaining transparent glaze raw materials and the remaining water and ball mill it. After ball milling, the fineness of the transparent glaze slurry is controlled to be 0.2% residue on a 325-mesh sieve, and the specific gravity is controlled to be 1.42 g / cm³. 3 The flow rate was controlled at 23s to obtain a strontium silicate antifouling transparent glaze slurry; Step 5: Apply the strontium silicate anti-fouling transparent glaze to the outer side of the patterned decorative layer by a glazing method, with an application rate of 155 g / m². 2A strontium silicate anti-fouling transparent glaze layer is formed. After glazing, the brick blank is dried at 115℃ for 5 minutes. The glazed brick blank is then sent to a roller kiln for firing. The maximum firing temperature is 1205℃, the firing cycle is 56 minutes, and the holding time is 6 minutes. After firing, the brick blank is cooled, edged, and graded to obtain anti-fouling strontium silicate ceramic brick.

[0032] The preparation method of the strontium silicate composite functional material includes the following steps: S1, take 100 kg of strontium silicate functional material, 0.25 kg of sodium polyacrylate, 0.2 kg of sodium tripolyphosphate, and 0.15 kg of citric acid, add 90 kg of water, and disperse at 1200 r / min for 30 min to obtain strontium silicate pre-dispersion slurry; S2. Prepare a tungsten source solution by adding 3.16 kg of ammonium metatungstate hydrate (calculated as WO3) to 20 kg of water; prepare a strontium nitrate solution by adding 1.42 kg of strontium nitrate (calculated as SrO) to 10 kg of water; prepare a strontium nitrate solution by adding 0.1 kg of cerium nitrate hexahydrate (calculated as CeO2) to 2 kg of water; add the tungsten source solution, strontium nitrate solution, and cerium nitrate solution dropwise to the strontium silicate pre-dispersion slurry in sequence, controlling the pH of the slurry to 8.4 during the dropwise addition. After the dropwise addition is completed, continue stirring for 60 min to allow the tungsten source, strontium source, and cerium source to be uniformly adsorbed and deposited on the surface of the strontium silicate functional material. S3. The obtained slurry is spray-dried at an inlet air temperature of 180℃ and an outlet air temperature of 90℃ to obtain composite precursor powder. The composite precursor powder is placed in a calcining furnace and kept at 780℃ for 2 hours. After cooling to room temperature with the furnace, it is lightly ball-milled using zirconia grinding media with a diameter of 5mm. The ball-to-material mass ratio is 1.2:1, the ball milling speed is 80r / min, and the ball milling time is 30min. During the ball milling process, the powder temperature is controlled not to exceed 50℃. After light ball milling, the obtained powder is pre-sieved through a 200-mesh sieve and then classified by air classifier. The classifier wheel speed is 2400r / min, the classifier air pressure is 0.6MPa, and the powder components with a D50 particle size of 3.6μm and a D90 particle size of 6.8μm are collected to obtain strontium silicate composite functional material.

[0033] Example 3

[0034] This is basically the same as Example 2, except that the preparation method of the strontium silicate composite functional material is different. The preparation method of the strontium silicate composite functional material includes the following steps: S1. Add 100 kg of strontium silicate functional material, 0.25 kg of sodium polyacrylate, 0.2 kg of sodium tripolyphosphate, and 0.15 kg of tetrasodium 2-phosphonobutane-1,2,4-tricarboxylate to 90 kg of water and disperse at 1200 r / min for 30 min to obtain strontium silicate pre-dispersion slurry. S2. Prepare a tungsten source solution by adding 3.16 kg of ammonium metatungstate hydrate (calculated as WO3) to 20 kg of water; prepare a strontium nitrate solution by adding 1.42 kg of strontium nitrate (calculated as SrO) to 10 kg of water; prepare a strontium nitrate solution by adding 0.1 kg of cerium nitrate hexahydrate (calculated as CeO2) to 2 kg of water; add the tungsten source solution, strontium nitrate solution, and cerium nitrate solution dropwise to the strontium silicate pre-dispersion slurry in sequence, controlling the pH of the slurry to 8.4 during the dropwise addition. After the dropwise addition is completed, continue stirring for 60 min to allow the tungsten source, strontium source, and cerium source to be uniformly adsorbed and deposited on the surface of the strontium silicate functional material. S3. The obtained slurry is spray-dried at an inlet air temperature of 180℃ and an outlet air temperature of 90℃ to obtain composite precursor powder. The composite precursor powder is placed in a calcining furnace and kept at 780℃ for 2 hours. After cooling to room temperature with the furnace, it is lightly ball-milled using zirconia grinding media with a diameter of 5mm. The ball-to-material mass ratio is 1.2:1, the ball milling speed is 80r / min, and the ball milling time is 30min. During the ball milling process, the powder temperature is controlled not to exceed 50℃. After light ball milling, the obtained powder is pre-sieved through a 200-mesh sieve and then classified by air classifier. The classifier wheel speed is 2400r / min, the classifier air pressure is 0.6MPa, and the powder components with a D50 particle size of 3.6μm and a D90 particle size of 6.8μm are collected to obtain strontium silicate composite functional material.

[0035] Example 4

[0036] It is basically the same as Example 3, except that the preparation method of the strontium silicate composite functional material is different. The preparation method of the strontium silicate composite functional material includes the following steps: S1. Add 100 kg of strontium silicate functional material, 0.25 kg of sodium polyacrylate, 0.20 kg of sodium tripolyphosphate, and 0.15 kg of tetrasodium 2-phosphonobutane-1,2,4-tricarboxylate to 90 kg of water and disperse at 1200 r / min for 30 min to obtain strontium silicate pre-dispersion slurry. S2. Take 1 kg of silicotungstic acid hydrate (calculated as WO3) and add it to 15 kg of water. Stir at 25°C and 600 r / min for 20 min to obtain an aqueous silicotungstic acid solution. Under continuous stirring, add 25% ammonia water to the aqueous silicotungstic acid solution to adjust the pH to 7.2 and continue stirring for 10 min to obtain an ammonium silicotate solution. Take 0.35 kg of zirconium carbonate ammonium solution (calculated as ZrO2) and the ammonium silicotate solution and add them to 10 kg of water. Stir for 20 min and adjust the pH to 8.2 to prepare a zirconium-silicotungstic composite interface liquid. Add the zirconium-silicotungstic composite interface liquid to the strontium silicate pre-dispersion slurry and continue stirring for 30 min to form a zirconium phosphine carboxylic acid-silicotungstic acid composite complex adsorption layer. A tungsten source solution was prepared by adding 2.16 kg of ammonium metatungstate hydrate (calculated as WO3) to 15 kg of water; a strontium nitrate solution was prepared by adding 1.42 kg of strontium nitrate (calculated as SrO) to 10 kg of water; and a cerium nitrate solution was prepared by adding 0.1 kg of cerium nitrate hexahydrate (calculated as CeO2) to 2 kg of water. The tungsten source solution, strontium nitrate solution, and cerium nitrate solution were sequentially added dropwise to the strontium silicate pre-dispersion slurry containing the zirconium phosphine carboxylic acid-silicotungstate composite complex adsorption layer. During the addition process, the pH of the slurry was controlled at 8.4. After the addition was completed, stirring was continued for 60 min. The resulting slurry was then spray-dried at an inlet air temperature of 180°C and an outlet air temperature of 90°C. Composite precursor powder was obtained. The composite precursor powder was placed in a calcination furnace and kept at 780℃ for 2 hours. After cooling to room temperature with the furnace, it was lightly ball-milled using zirconia grinding media with a diameter of 5 mm. The ball-to-material mass ratio was 1.2:1, the ball milling speed was 80 r / min, and the ball milling time was 30 min. During the ball milling process, the powder temperature was controlled not to exceed 50℃. After light ball milling, the obtained powder was pre-sieved through a 200-mesh sieve, and then particle size was classified by air classifier. The classifier wheel speed was 2400 r / min, the classifier air pressure was 0.6 MPa, and the powder components with D50 particle size of 3.6 μm and D90 particle size of 6.8 μm were collected to obtain strontium silicate composite functional material.

[0037] Example 5

[0038] This is basically the same as Example 4, except that the preparation method of the strontium silicate composite functional material is different. The preparation method of the strontium silicate composite functional material includes the following steps: S1. Add 100 kg of strontium silicate functional material, 0.25 kg of sodium polyacrylate, 0.20 kg of sodium tripolyphosphate, and 0.15 kg of tetrasodium 2-phosphonobutane-1,2,4-tricarboxylate to 90 kg of water and disperse at 1200 r / min for 30 min to obtain strontium silicate pre-dispersion slurry. S2. Take 0.35 kg of zirconium ammonium carbonate solution (calculated as ZrO2) and add it to 10 kg of water. Mix well and adjust the pH to 8.2 to prepare a zirconium interface solution. Add the zirconium interface solution to the strontium silicate pre-dispersed slurry and continue stirring for 30 min to form a complex adsorption layer. A tungsten source solution was prepared by adding 3.16 kg of ammonium metatungstate hydrate (calculated as WO3) to 20 kg of water; a strontium nitrate solution was prepared by adding 1.42 kg of strontium nitrate (calculated as SrO) to 10 kg of water; and a cerium nitrate solution was prepared by adding 0.1 kg of cerium nitrate hexahydrate (calculated as CeO2) to 2 kg of water. The tungsten source solution, strontium nitrate solution, and cerium nitrate solution were sequentially added dropwise to a strontium silicate pre-dispersion slurry containing a complex adsorption layer. During the addition process, the pH of the slurry was controlled at 8.4. After the addition was completed, stirring was continued for 60 min. The resulting slurry was then spray-dried at an inlet air temperature of 180°C and an outlet air temperature of 90°C to obtain a composite precursor powder. The composite precursor powder was placed in a calcining furnace and kept at 780℃ for 2 hours. After cooling to room temperature with the furnace, it was lightly ball-milled using zirconia grinding media with a diameter of 5 mm. The ball-to-material mass ratio was 1.2:1, the ball milling speed was 80 r / min, and the ball milling time was 30 min. During the ball milling process, the powder temperature was controlled not to exceed 50℃. After light ball milling, the obtained powder was pre-sieved through a 200-mesh sieve, and then particle size was classified by air classifier. The classifier wheel speed was 2400 r / min, the classifier air pressure was 0.6 MPa, and the powder components with a D50 particle size of 3.6 μm and a D90 particle size of 6.8 μm were collected to obtain the strontium silicate composite functional material.

[0039] Example 6

[0040] This is basically the same as Example 4, except that the preparation method of the strontium silicate composite functional material is different. The preparation method of the strontium silicate composite functional material includes the following steps: S1. Add 100 kg of strontium silicate functional material, 0.25 kg of sodium polyacrylate, 0.20 kg of sodium tripolyphosphate, and 0.15 kg of tetrasodium 2-phosphonobutane-1,2,4-tricarboxylate to 90 kg of water and disperse at 1200 r / min for 30 min to obtain strontium silicate pre-dispersion slurry. S2. Take 1 kg of silicotungstic acid hydrate (calculated as WO3) and add it to 15 kg of water. Stir at 25°C and 600 r / min for 20 min to obtain an aqueous silicotungstic acid solution. Under continuous stirring, add 25% ammonia water dropwise to the aqueous silicotungstic acid solution to adjust the pH to 7.2, and continue stirring for 10 min to obtain an ammonium-type silicotungstic acid solution. Add the ammonium-type silicotungstic acid solution to 10 kg of water and mix evenly. Adjust the pH to 8.2 to prepare a silicotungstic interfacial solution. Add the silicotungstic interfacial solution to the strontium silicate predispersed slurry and continue stirring for 30 min to form a composite complex adsorption layer. A tungsten source solution was prepared by adding 2.16 kg of ammonium metatungstate hydrate (calculated as WO3) to 15 kg of water; a strontium nitrate solution was prepared by adding 1.42 kg of strontium nitrate (calculated as SrO) to 10 kg of water; and a cerium nitrate solution was prepared by adding 0.1 kg of cerium nitrate hexahydrate (calculated as CeO2) to 2 kg of water. The tungsten source solution, strontium nitrate solution, and cerium nitrate solution were sequentially added dropwise to a strontium silicate pre-dispersion slurry containing a composite complex adsorption layer. During the addition process, the pH of the slurry was controlled at 8.4. After the addition was completed, stirring was continued for 60 min. The resulting slurry was then spray-dried at an inlet air temperature of 180°C and an outlet air temperature of 90°C to obtain the composite precursor. Powder; The composite precursor powder was placed in a calcination furnace and kept at 780℃ for 2 hours. After cooling to room temperature with the furnace, it was lightly ball-milled using zirconia grinding media with a diameter of 5 mm. The ball-to-material mass ratio was 1.2:1, the ball milling speed was 80 r / min, and the ball milling time was 30 min. During the ball milling process, the powder temperature was controlled not to exceed 50℃. After light ball milling, the obtained powder was pre-sieved through a 200-mesh sieve, and then particle size was classified by air classifier. The classifier wheel speed was 2400 r / min, and the classifier air pressure was 0.6 MPa. Powder components with a D50 particle size of 3.6 μm and a D90 particle size of 6.8 μm were collected to obtain strontium silicate composite functional material.

[0041] Comparative Example 1 The process is basically the same as in Example 1, except that strontium silicate functional material is not added in step 4, and the amount of transparent frit is adjusted from 62 parts to 67 parts. The composition of other raw materials, glaze preparation process, glaze application amount and firing regime are the same as in Example 1.

[0042] Comparative Example 2 It is basically the same as Example 2, except that the strontium silicate composite functional material is prepared by physical mixing method.

[0043] Specifically, 100 kg of strontium silicate functional material, 3.16 kg of ammonium metatungstate hydrate (calculated as WO3), 1.42 kg of strontium nitrate (calculated as SrO), and 0.1 kg of cerium nitrate hexahydrate (calculated as CeO2) were added to water and mixed evenly. Then, 0.25 kg of sodium polyacrylate and 0.2 kg of sodium tripolyphosphate were added. After dispersing at 1200 r / min for 30 min, the mixture was directly spray-dried. The inlet air temperature for spray drying was 180℃, and the outlet air temperature was 90℃, resulting in a composite precursor powder. The composite precursor powder was placed in a calcining furnace and held at 780℃ for 2 h. After the furnace cooled to room temperature, dry light ball milling was performed using zirconia grinding media with a diameter of 5 mm. The ball-to-material mass ratio was 1.2:1, the ball milling speed was 80 r / min, and the ball milling time was 30 min. During the ball milling process, the powder temperature was controlled not to exceed 50℃. After light ball milling, the obtained powder was pre-sieved through a 200-mesh sieve, and then particle size was classified by air classifier. The classifier wheel speed was 2400 r / min, the classifier air pressure was 0.6 MPa, and the powder components with a D50 particle size of 3.6 μm and a D90 particle size of 6.8 μm were collected to obtain a physically mixed strontium silicate composite functional material.

[0044] Comparative Example 3 It is basically the same as Example 4, except that 2-phosphonobutane-1,2,4-tricarboxylic acid tetrasodium salt is not added during the preparation of strontium silicate composite functional material.

[0045] In S1, only 100 kg of strontium silicate functional material, 0.25 kg of sodium polyacrylate, and 0.2 kg of sodium tripolyphosphate were added to 90 kg of water and dispersed at 1200 r / min for 30 min to obtain strontium silicate pre-dispersion slurry. The amounts of the remaining ammonium zirconium carbonate, ammonium silicotungstate, ammonium metatungstate, strontium nitrate, and cerium nitrate, as well as the subsequent spray drying, calcination, light ball milling, and classification processes, were the same as in Example 4.

[0046] Comparative Example 4 It is basically the same as Example 4, except that the zirconium ammonium carbonate solution and ammonium silicotungstic acid are not pre-prepared into zirconium-silicon tungsten composite interface solution, but are added in steps.

[0047] Specifically, after preparing a strontium silicate predispersed slurry in the presence of tetrasodium 2-phosphonobutane-1,2,4-tricarboxylate, 0.35 kg of zirconium carbonate ammonium solution (calculated as ZrO2) was first added and stirred for 30 min. Then, an ammonium silicotungstate solution was added and stirred for another 30 min. Subsequently, ammonium metatungstate solution, strontium nitrate solution, and cerium nitrate solution were added. The remaining steps were the same as in Example 4.

[0048] The method for preparing the ammonium-type silicotungstic acid solution is as follows: 1 kg of silicotungstic acid hydrate (calculated as WO3) is added to 15 kg of water and stirred for 20 min at 25°C and 600 r / min to obtain an aqueous solution of silicotungstic acid; under continuous stirring, 25% ammonia water is added dropwise to the aqueous solution of silicotungstic acid to adjust the pH to 7.2, and stirring is continued for 10 min to obtain the ammonium-type silicotungstic acid solution.

[0049] Test Example 1 The strontium silicate antifouling transparent glaze slurry prepared in step 4 of each embodiment and comparative example was tested at 25°C using a Forte 4 cup to measure the initial flow rate before standing. The glaze slurry was then placed in a sealed container of the same specifications and allowed to stand for 2 hours. The flow rate after standing was tested again using a Forte 4 cup, and the change rate of flow rate after 2 hours of standing was calculated using the following formula: The rate of change in flow rate of the glaze slurry after standing for 2 hours = (flow rate after standing - initial flow rate) / initial flow rate × 100% The smaller the change rate of the flow rate of the glaze slurry after standing for 2 hours, the better the dispersion stability of the functional material in the transparent glaze slurry, and the less likely it is to agglomerate, settle or thicken.

[0050] Table 1. Test results of the static stability of the glaze slurry.

[0051] Test Example 2 The performance of the antifouling strontium silicate ceramic bricks obtained in Examples 1-6 and Comparative Examples 1-4 was tested.

[0052] (1) Place the fired ceramic bricks under the same lighting conditions and observe the glaze surface. Count the number of visible pinholes within a 1m² area. When the sample area is less than 1m², convert it to the number of pinholes per square meter based on the actual test area. This test is used to evaluate pinhole, dark bubble and micropore defects caused by uneven dispersion, local enrichment or insufficient venting of functional materials in the glaze layer.

[0053] (2) The Ra value of the ceramic tile glaze was tested using a surface roughness tester. Five different locations were selected for testing on each ceramic tile, and the average value was taken. The lower the Ra value, the smoother and denser the glaze surface, and the less likely contaminants are to enter the micropores and small depressions of the glaze surface.

[0054] Table 2 Test results of glaze defects and surface smoothness of anti-fouling strontium silicate ceramic tiles

[0055] Test Example 3 The performance of the anti-fouling strontium silicate ceramic tiles obtained in Examples 1-6 and Comparative Examples 1-4 was tested. Black ink was selected as the contamination medium. Black ink was dropped onto the glaze surface of the ceramic tile to form a contaminated area with a diameter of 20 mm. After standing for 24 hours, the area was wiped 30 times with a damp cloth. The color difference ΔE before and after contamination was measured using a colorimeter and recorded as ΔE after ink contamination. The smaller the ΔE, the less likely the contaminant is to remain.

[0056] Subsequently, the ceramic tile glaze was subjected to 1500 reciprocating scrubs at a pressure of 9.8 N using a neutral detergent aqueous solution. After scrubbing, the black ink staining method described above was repeated, and the ink staining ΔE after 1500 scrubs was obtained. This data is used to evaluate the stain resistance retention of the ceramic tile glaze.

[0057] Table 3. Test results of stain resistance and stain resistance retention after wiping of ink on strontium silicate ceramic bricks.

[0058] As shown in Tables 1-3, Comparative Example 1, without the addition of strontium silicate functional material, had a glaze slurry flow rate change rate of 4.5% after standing for 2 hours, lower than the 8% of Example 1. This is because the transparent glaze slurry of Comparative Example 1 does not have the agglomeration and sedimentation problems caused by strontium silicate functional material. As shown in Tables 2-3, the Ra value of the glaze surface, the ΔE after ink contamination, and the ΔE after 1500 wiping cycles of Comparative Example 1 are all significantly worse than those of Example 1. This indicates that without the addition of strontium silicate functional material, the transparent glaze layer lacks the regulating effect of strontium silicate component on the glass phase structure, resulting in insufficient glaze density and anti-fouling performance.

[0059] In Example 1, after adding ordinary strontium silicate functional material, the ink contamination ΔE and the ink contamination ΔE after 1500 washes were significantly lower than those in Comparative Example 1, indicating that strontium silicate functional material can improve the density of the glaze layer and enhance its anti-fouling performance. However, Example 1 still suffers from a high glaze slurry flow rate change rate and a large number of pinholes, indicating that ordinary strontium silicate functional material is still prone to agglomeration, sedimentation, or local enrichment in transparent glaze slurry, limiting the smoothness of the glaze surface and its anti-fouling retention.

[0060] In Example 2, after using strontium silicate composite functional material, compared with Example 1, the change rate of glaze slurry flow rate after standing for 2 hours, the number of pinholes, the Ra value of the glaze surface, and the ΔE after ink contamination were all further reduced. This indicates that the cerium-doped strontium tungstate microcrystalline phase can improve the dispersion state of strontium silicate functional material in transparent glaze, reduce the tendency of local enrichment of Sr component, and promote the rearrangement of the glass phase in the glaze layer during firing, making the glaze surface smoother and denser. Comparative Example 2, which uses a physical mixing method to prepare composite functional material, showed significantly inferior performance compared to Example 2. This indicates that simple physical mixing is insufficient to ensure uniform adhesion of the microcrystalline phase to the surface of the strontium silicate functional material, easily leading to unstable glaze slurry dispersion and increased firing defects.

[0061] In Example 3, the introduction of tetrasodium 2-phosphonobutane-1,2,4-tricarboxylate during the preparation of the composite functional material further improved the glaze stability, pinhole count, and antifouling performance compared to Example 2. This indicates that tetrasodium 2-phosphonobutane-1,2,4-tricarboxylate can complex and adsorb strontium, cerium, and strontium silicate powder surface metal sites through phosphonic and carboxylic acid groups, reducing salt migration during spray drying and free grain formation during calcination. Comparative Example 3, without the addition of tetrasodium 2-phosphonobutane-1,2,4-tricarboxylate, showed weaker glaze stability, glaze Ra value, and antifouling retention after wiping compared to Example 4, indicating that tetrasodium 2-phosphonobutane-1,2,4-tricarboxylate plays a crucial role in forming a stable and uniform interfacial adsorption layer.

[0062] In Example 4, ammonium zirconium carbonate and ammonium-type silicotungstenate were pre-prepared into a zirconium-silicon-tungsten composite interface solution, which was simultaneously added to the strontium silicate pre-dispersion slurry in the presence of tetrasodium 2-phosphonobutane-1,2,4-tricarboxylate. The flow rate change rate, pinhole number, glaze surface Ra value, ink contamination ΔE, and ink contamination ΔE after 1500 washes were the best among all groups in Example 4. This indicates that ammonium zirconium carbonate, ammonium-type silicotungstenate, and tetrasodium 2-phosphonobutane-1,2,4-tricarboxylate can jointly construct a uniform interfacial adsorption structure and form an interface-induced structure after calcination. This improves the uniformity of cerium-doped strontium tungstate microcrystalline phase adhesion on the surface of the strontium silicate functional material, reduces pinholes, micropores, and roughness defects on the glaze surface, and improves anti-fouling retention.

[0063] Although Comparative Example 4 added both ammonium zirconium carbonate and ammonium-type silicotungstenate simultaneously, it did so in a stepwise manner, resulting in weaker performance than Example 4. This indicates that stepwise addition easily leads to isolated hydrolysis of the zirconium source, migration of silicotungstenate ions, or free nucleation of strontium tungstate microcrystals, resulting in insufficient continuity and uniformity of the interface layer. Example 5 added only ammonium zirconium carbonate, and Example 6 added only ammonium-type silicotungstenate. Both examples showed weaker performance than Example 4, indicating that ammonium zirconium carbonate and ammonium-type silicotungstenate are not simply substitutes, but rather produce a synergistic effect when simultaneously forming a zirconium-silicotungsten composite interface liquid in the presence of 2-phosphonobutane-1,2,4-tricarboxylic acid tetrasodium salt.

[0064] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A method for preparing a stain-proof strontium silicate ceramic tile, characterized by, Includes the following steps: S1. Prepare ceramic brick blank powder, and press and dry the ceramic brick blank powder to obtain ceramic brick blank; S2. Prepare a base glaze slurry and apply the base glaze slurry to the surface of the ceramic tile body to form a base glaze layer; S3. Inkjet printing is performed on the surface of the base glaze layer to form a patterned decorative layer; S4. Prepare a strontium silicate anti-fouling transparent glaze paste, and apply the strontium silicate anti-fouling transparent glaze paste to the outside of the pattern decoration layer to form a strontium silicate anti-fouling transparent glaze layer; S5. The glazed brick blanks are sent into a roller kiln for firing. After firing, they are cooled, edged and graded to obtain anti-fouling strontium silicate ceramic bricks. The strontium silicate antifouling transparent glaze paste includes transparent frit, potassium sodium feldspar, quartz powder, calcined kaolin, wollastonite, calcined alumina, functional materials, sodium carboxymethyl cellulose, sodium tripolyphosphate, sodium polyacrylate, and water; The functional material is at least one of strontium silicate functional material and strontium silicate composite functional material.

2. The method of claim 1, wherein the anti-fouling strontium silicate ceramic tile is prepared by the steps of: The strontium silicate antifouling transparent glaze paste comprises, by weight: 58-66 parts transparent frit, 8-12 parts potassium-sodium feldspar, 5-9 parts quartz powder, 4-8 parts calcined kaolin, 4-6 parts wollastonite, 1-3 parts calcined alumina, 3-7 parts functional material, 0.08-0.16 parts sodium carboxymethyl cellulose, 0.15-0.35 parts sodium tripolyphosphate, 0.05-0.12 parts sodium polyacrylate, and 90-110 parts water. ​ 3. The method for preparing the anti-fouling strontium silicate ceramic brick as described in claim 1, characterized in that: The strontium silicate functional material comprises, by mass percentage of oxides: SrO 34-39%, SiO2 42-54%, Al2O3 0.8-3%, CaO 2.5-8.5%, SO3 3-7.5%, MgO 0.1-0.8%, Fe2O3 0.3-1.2%, K2O 0.3-1.2%, Na2O 0.05-1%, BaO 0.1-1%, with the balance being unavoidable impurities and loss on ignition; the strontium silicate functional material has a D50 particle size of 2.5-5μm, a moisture content not exceeding 0.5wt%, and a residue on a 325-mesh sieve not exceeding 0.3wt%.

4. The method for preparing the anti-fouling strontium silicate ceramic brick as described in claim 1, characterized in that: The strontium silicate composite functional material is prepared by the following method: strontium silicate functional material, sodium polyacrylate, sodium tripolyphosphate and complexing dispersant are added to water and dispersed to obtain strontium silicate pre-dispersed slurry; a composite interface liquid is added to the strontium silicate pre-dispersed slurry. Then, tungsten source, strontium source and cerium source are added to deposit the tungsten source, strontium source and cerium source on the surface of strontium silicate functional material. After drying and calcination, strontium silicate composite functional material is obtained.

5. The method for preparing the anti-fouling strontium silicate ceramic brick as described in claim 4, characterized in that: The complexing and dispersing agent is at least one of citric acid and tetrasodium 2-phosphonobutane-1,2,4-tricarboxylic acid.

6. The method of claim 4, wherein the anti-fouling strontium silicate ceramic tile is prepared by the steps of: The composite interface liquid is prepared by the following method: silicotungstic acid hydrate is dissolved in water, and the pH value is adjusted with ammonia water to obtain an ammonium silicotungstic acid solution; the ammonium silicotungstic acid solution is mixed with an ammonium zirconium carbonate solution, and the pH value is adjusted to obtain a zirconium-silicotungstic composite interface liquid. ​ 7. The method of claim 6, wherein the method is characterized by: The amount of silicotungstic acid hydrate added is 0.6-1.4 parts by mass based on WO3, and the amount of zirconium ammonium carbonate solution added is 0.2-0.5 parts by mass based on ZrO2.

8. The method of claim 4, wherein the anti-fouling strontium silicate ceramic tile is prepared by the steps of: In preparing the strontium silicate composite functional material, 100 parts by weight of strontium silicate functional material, 0.15-0.35 parts by weight of sodium polyacrylate, 0.1-0.3 parts by weight of sodium tripolyphosphate, and 0.08-0.25 parts by weight of complexing and dispersing agent are added to 80-100 parts by weight of water and dispersed at 1000-1500 r / min for 20-40 min to obtain strontium silicate pre-dispersion slurry. ​ 9. A stain-proofing strontium silicate ceramic tile, characterized by: It is prepared by the preparation method described in any one of claims 1-8.

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