Titanium dioxide opacifier and preparation method thereof

Abstract

The invention provides a titanium dioxide opacifier and a preparation method thereof, the titanium dioxide opacifier and the preparation method are as follows: mixing raw materials according to a predetermined formula, and performing wet ball milling to obtain slurry, the predetermined formula including a titanium compound; spraying the slurry to prepare powder, so as to obtain powder; and putting the powder into a sagger, calcining, taking out after calcining, and powdering the calcined powder to obtain the titanium dioxide opacifier. The titanium-containing opacifier formula is calcined to obtain the calcined titanium dioxide opacifier, so that the calcined titanium dioxide opacifier is prevented from generating rutile in the ground glaze, the problem of yellowing of the glaze surface is further reduced, and isolation glaze does not need to be adopted.

Description

Technical Field

[0001] This invention relates to the field of ceramic production technology, and in particular to a titanium dioxide opacifier and its preparation method. Background Technology

[0002] In the field of ceramic base glazes, achieving an opaque effect is one of the key factors in improving the appearance quality of ceramic products. A ceramic base glaze is a layer of milky white, matte ceramic glaze, with a gloss level generally between 4 and 10. The microstructure of the ceramic base glaze includes gaseous phases, crystalline phases, glassy phases, and unmelted high-temperature phases. Its opaque phase is generally a white crystal with a high refractive index, causing complex optical phenomena such as scattering, refraction, and diffuse reflection at the interface of the multiphase structure when incident on optical fibers. Figure 1 As shown, this prevents light from passing through the glaze layer, resulting in a milky white effect.

[0003] In ceramic glazes, high-refractive-index crystalline phases are typically used to create an opaque effect. A common practice is to add opacifiers such as tin oxide or zirconium silicate to the glaze to achieve a milky white color. However, tin oxide is extremely expensive, making its use in ceramic production costly. The price of zirconium silicate is also rising, further increasing costs.

[0004] In the search for alternatives to zirconium silicate, corundum, titanite, and other phases have gradually come into focus in the ceramics industry and are being tested as opacifiers in base glazes. These alternatives can, to some extent, achieve a similar opacifying effect to zirconium silicate. Taking the preparation of titanium dioxide base glaze using the raw material method as an example, in existing technologies, when inkjet is sprayed onto the raw material titanium dioxide base glaze, the TiO2 in the base glaze reacts with the blue ink (cobalt aluminum spinel). This reaction makes it easier for TiO2 to be stripped away, forming rutile. The formation of rutile causes a series of problems, the most prominent of which is causing the glaze to yellow, making it difficult to accurately reproduce the inkjet color, seriously affecting the decorative effect and appearance quality of ceramic products. Current technology requires the application of isolation glazes and protective glazes to reduce the yellowing phenomenon.

[0005] Therefore, existing technologies have shortcomings and need to be improved and developed. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a titanium dioxide opacifier and its preparation method in view of the above-mentioned defects of the prior art, so as to solve the problem that if the titanium dioxide base glaze of the prior art is made of raw material, an isolation glaze is required to ensure that the inkjet printing does not turn yellow.

[0007] The technical solution adopted by this invention to solve the technical problem is as follows: The first aspect of this application provides a method for preparing a titanium dioxide opacifier, wherein the method for preparing the titanium dioxide opacifier includes: After mixing the raw materials according to the predetermined formula, the mixture is wet ball milled to obtain a slurry, wherein the predetermined formula includes a titanium compound. The slurry is spray-dried to obtain powder. The powder is placed in a sagger and calcined. After calcination, it is taken out and the calcined powder is ground to obtain titanium dioxide opacifier.

[0008] Based on the above technical means, the embodiments of this application calcine the titanium-containing opacifier formulation to obtain calcined titanium dioxide opacifier, so that the calcined titanium dioxide opacifier avoids the formation of rutile in the base glaze, thereby reducing the problem of yellowing of the glaze surface, and eliminating the need for the use of a separating glaze.

[0009] In one implementation of this application, the predetermined formula further includes: kaolin, calcined talc, and a magnesium compound; the titanium compound includes titanium dioxide and / or metatitanic acid; and the magnesium compound includes magnesium hydroxide and / or magnesium carbonate.

[0010] Based on the above-mentioned technical means, the embodiments of this application synthesize magnesium titanate via a solid-phase method, using magnesium carbonate or magnesium hydroxide, along with titanium dioxide or metatitanic acid as raw materials. Magnesium titanate or metatitanic acid is calcined and then fused together with calcined talc to prepare a titanium dioxide opacifier. In the formulation for preparing the titanium dioxide opacifier, a small amount of kaolin is also added as a glaze slurry suspending agent, and calcined talc is added as a melt-encapsulation and solid-solution method to improve the stability of the opacifier in the formulation.

[0011] In one implementation of this application, the raw materials of the predetermined formula, by weight, include: 4-8 parts kaolin, 5-15 parts calcined talc, 20-30 parts titanium dioxide, and 55-68 parts magnesium hydroxide; Alternatively, 4-8 parts kaolin, 5-15 parts calcined talc, 20-30 parts titanium dioxide, and 80-100 parts magnesium carbonate.

[0012] Based on the above technical means, the titanium dioxide opacifier provided in this application, after being calcined, yields magnesium titanate or metatitanic acid, which, when used in the base glaze, has greatly improved stability and can significantly reduce the yellowing phenomenon of the glaze surface, thus avoiding the yellowing phenomenon that occurs when all raw materials are used in the base glaze.

[0013] In one implementation of this application, the raw materials of the predetermined formula, by weight, include: 5 parts kaolin, 10 parts calcined talc, 22 parts titanium dioxide, and 63 parts magnesium hydroxide; Alternatively, 5 parts kaolin, 10 parts calcined talc, 27 parts titanium dioxide, and 58 parts magnesium hydroxide; Alternatively, 5 parts kaolin, 10 parts calcined talc, 22 parts titanium dioxide, and 96 parts magnesium carbonate. Alternatively, 5 parts kaolin, 10 parts calcined talc, 27 parts titanium dioxide, and 86 parts sodium carbonate.

[0014] Based on the above technical means, the titanium dioxide opacifier formulation in this application ensures the reaction of MgO and TiO2 by satisfying that the molar ratio of MgO to TiO2 is greater than or equal to 3.

[0015] In one implementation of this application, the powder is placed in a sagger and calcined. After calcination, the powder is removed and then pulverized to obtain a titanium dioxide opacifier, comprising: The powder is placed in a sagger and calcined at 1300°C. After calcination, it is cooled and removed, then ground to 200 mesh to obtain titanium dioxide opacifier.

[0016] Based on the above technical means, the titanium dioxide opacifier provided in this application embodiment can be used in roller kilns with a temperature range of 1100~1140℃ as measured by the temperature measuring ring and a firing cycle of 35~65min.

[0017] A second aspect of this application provides a titanium dioxide opacifier, wherein the titanium dioxide opacifier is prepared by the titanium dioxide opacifier preparation method described above.

[0018] A third aspect of this application provides a base glaze, wherein the base glaze formulation includes a basic formulation and the titanium dioxide opacifier as described above; The basic formula, by weight, comprises: Kaolin 8-15 parts, potassium feldspar 10-20 parts, potassium sodium ore 25-45 parts, frit 10-32 parts, quartz 8-15 parts, calcined talc 5-12 parts, magnesium hydroxide 1-8 parts; The basic formula consists of 100 parts of each component, and the titanium dioxide opacifier is added to the basic formula in an amount of 15-20 parts.

[0019] Based on the above-mentioned technical means, in this embodiment, the titanium dioxide opacifier is melted into the calcined talc, thereby improving the stability of the titanium dioxide opacifier. In addition, magnesium hydroxide is added to the base glaze formula to prevent yellowing after inkjet printing, further improving the stability of the titanium dioxide base glaze during use.

[0020] In one implementation of this application, the chemical composition of the melt, by mass percentage, includes: The composition is as follows: SiO2 60.5~65.3%, Al2O3 8.45~15.51%, ZrO2 3.12~7.25%, Fe2O3 0.1~0.2%, CaO 5.89~9.07%, MgO 3.64~7.17%, K2O 4.67~8.79%, Na2O 1.11~2.96%, with the balance being impurities. The basic formula, by weight, comprises: The basic formula contains 11 parts kaolin, 12 parts potassium feldspar, 39 parts potassium sodium ore, 14 parts frit, 12 parts quartz, 6 parts calcined talc, and 6 parts magnesium hydroxide. An additional 17 parts of titanium dioxide opacifier are added to the basic formula. According to the above technical means, in the frit of this embodiment, SiO2 serves as the basic framework of the glaze, forming a silicon-oxygen tetrahedral network structure, imparting high hardness, wear resistance, and chemical stability to the glaze layer. K2O and Na2O can lower the melting point of the SiO2 network structure, promoting the melting of the glaze at low temperatures. Al2O3 forms aluminum-oxygen tetrahedra, embedded in the SiO2 network, enhancing the hardness and impact resistance of the glaze layer. MgO, as an intermediate oxide, regulates the melting range of the glaze, inhibits excessive grain growth, and improves the density of the glaze layer. ZrO2 improves the thermal stability of the glaze layer, inhibits crack propagation caused by rapid heating and cooling, and enhances resistance to chemical corrosion. CaO, as a flux, reduces the high-temperature viscosity of the glaze, promotes bubble removal, and improves the smoothness of the glaze surface.

[0021] The fourth aspect of this application provides a method for preparing a ceramic product, wherein the method for preparing the ceramic product includes: Apply the base glaze as described above to the ceramic body to form a base glaze layer; The ceramic body with a base glaze layer is processed into a glazed body; The glazed blank is fired in a kiln at a temperature of 1100~1140℃ for a period of 35~65 minutes to obtain a ceramic product.

[0022] Based on the above technical means, the titanium dioxide opacifier provided in the embodiments of this application can be used in a roller kiln with a temperature range of 1100~1140℃ measured by the temperature measuring ring and a firing cycle of 35~65min. Therefore, the firing temperature of the glaze blank in this application can be 1100~1140℃ and the firing cycle can be 35~65min.

[0023] A fifth aspect of this application provides a ceramic product, wherein the ceramic product is prepared by the method described above.

[0024] The beneficial effects of this application are as follows: This invention provides a titanium dioxide opacifier and its preparation method. The titanium dioxide opacifier and preparation method include: mixing raw materials according to a predetermined formula, followed by wet ball milling to obtain a slurry, wherein the predetermined formula includes a titanium compound; spray-drying the slurry to obtain a powder; placing the powder into a sagger and calcining it; removing the powder after calcination and then grinding it to obtain the titanium dioxide opacifier. This application calcines a titanium-containing opacifier formula to obtain a calcined titanium dioxide opacifier, thereby preventing the formation of rutile in the base glaze and reducing the problem of yellowing of the glaze surface, eliminating the need for a separating glaze. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the scattering model of ceramic glaze.

[0026] Figure 2 This is a flowchart of a preferred embodiment of a method for preparing a titanium dioxide opacifier according to the present invention. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this invention clearer and more explicit, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0028] In ceramic glazes, the scattering intensity of high-refractive-index crystalline phases depends on the particle size, relative refractive index, and number of scattering particles (which in turn depends on their density in the glaze and the thickness of the glaze layer). Regarding particle size, according to Mie scattering theory, scattering is strongest when the radius of the scattering particle is 0.06–0.6 micrometers. Generally, scattering particles with a diameter equal to or slightly larger than the wavelength of visible light exhibit better opacity. Regarding relative refractive index, a larger refractive index difference results in stronger scattering and a better opacity effect in the glaze. Table 1 classifies opacifiers suitable for silicate glass media (n=1.5).

[0029] Table 1

[0030] Rutile has a refractive index of 2.76. When it combines with alkaline earth metal oxides, the resulting compound has a refractive index of approximately 2.4, which is much higher than the 1.9 refractive index of titanite. A higher refractive index means stronger light scattering, thus enabling a better opaque effect in the glaze.

[0031] Based on the above characteristics, the presence of highly efficient opacifiers such as perovskite in the base glaze will significantly improve the performance of ceramic product base glazes. If substances like perovskite can be used as opacifiers in ceramic base glazes, they can ensure good opacification while avoiding or reducing problems such as yellowing of the glaze surface that occur when using other opacifiers.

[0032] Please see Figure 2 , Figure 2 This is a method for preparing the titanium dioxide opacifier in this invention. For example... Figure 2 As shown, it includes the following steps: Step S100: After mixing the raw materials according to the predetermined formula, wet ball milling is performed to obtain a slurry, wherein the predetermined formula includes a titanium compound. Step S200: Spray-powder the slurry to obtain powder; Step S300: After loading the powder into a sagger, calcine it. After calcine is completed, take it out and grind the calcined powder to obtain titanium dioxide opacifier.

[0033] Among them, the sagger is a refractory container used in the ceramic firing process, mainly to protect the green body or finished porcelain from contamination or damage during high-temperature firing, thus ensuring the quality of the ceramics. In step S200, it is used to protect the powder. Powdering is a process of refining calcined block or granular materials to a specified particle size through mechanical crushing, grinding, etc. Its core purpose is to adjust the particle size distribution of the powder and optimize the performance of titanium dioxide opacifier.

[0034] Specifically, the preparation process of titanium dioxide opacifier is as follows: batching → wet ball milling → testing fineness and flow rate → adjusting flow rate → spray tower powdering → loading into a sagger → calcination → cooling and removal → grinding into powder for later use.

[0035] This application involves calcining a titanium-containing opacifier formulation to obtain a calcined titanium dioxide opacifier. This process prevents the formation of rutile in the base glaze, thereby reducing the problem of yellowing of the glaze surface and eliminating the need for a separating glaze.

[0036] In one embodiment of this application, the predetermined formulation further includes: kaolin, calcined talc, and a magnesium compound; the titanium compound includes titanium dioxide and / or metatitanic acid; the magnesium compound includes magnesium hydroxide and / or magnesium carbonate.

[0037] Titanium dioxide, also known as titanium dioxide, is the core opacifying component in titanium dioxide opacifiers. Its high refractive index enables strong covering and opacity. Metatitanic acid, as an intermediate product, is calcined into titanium dioxide, indirectly enhancing the opacifying properties.

[0038] Specifically, titanium dioxide and / or metatitanic acid undergo a solid-phase reaction with magnesium hydroxide and / or magnesium carbonate under high-temperature calcination to produce magnesium metatitanate and / or magnesium titanate. Applying this titanium dioxide opacifier to the base glaze of ceramic products results in a more stable and lower-cost base glaze.

[0039] This application describes the synthesis of magnesium titanate via a solid-state method, using magnesium carbonate or magnesium hydroxide, along with titanium dioxide or metatitanic acid as raw materials. Magnesium titanate or metatitanic acid is calcined and then fused together with calcined talc to prepare a titanium dioxide opacifier. In the formulation for preparing the titanium dioxide opacifier, a small amount of kaolin is added as a glaze slurry suspending agent, and calcined talc is added for melt encapsulation and solid solution, thereby improving the stability of the opacifier in the formulation.

[0040] In this embodiment of the application, the raw materials of the predetermined formula, by weight, include: 4-8 parts kaolin, 5-15 parts calcined talc, 20-30 parts titanium dioxide, and 55-68 parts magnesium hydroxide; Alternatively, 4-8 parts kaolin, 5-15 parts calcined talc, 20-30 parts titanium dioxide, and 80-100 parts magnesium carbonate.

[0041] In this application, a calcined titanium dioxide opacifier is prepared, where the magnesium-to-titanium ratio is a key parameter. During the solid-state reaction stage, if the molar ratio of MgO to TiO2 is 1:1, their one-to-one contact during calcination is extremely difficult. Therefore, a sufficient amount of MgO is necessary to ensure reaction with TiO2. Experimental comparisons show that, using the solid-state method, the molar ratio of MgO to TiO2 must be greater than or equal to 3.

[0042] In the above formulation, titanium dioxide can be replaced with metatitanic acid. Metatitanic acid is an intermediate product in the refining and preparation of titanium dioxide from titanium ore; it is cheaper, has higher reactivity, and a slightly lower TiO2 content. Magnesium hydroxide can be replaced with magnesium carbonate. For these substitutions, it is sufficient to ensure that the molar ratio of MgO to TiO2 is approximately 4:1.

[0043] The titanium dioxide opacifier provided in this application, after calcination, yields magnesium titanate or metatitanic acid, which, when used in the base glaze, exhibits significantly improved stability and can greatly reduce the yellowing of the glaze surface.

[0044] In one embodiment of this application, the raw materials of the predetermined formula, by weight, include: 5 parts kaolin, 10 parts calcined talc, 22 parts titanium dioxide, and 63 parts magnesium hydroxide; Alternatively, 5 parts kaolin, 10 parts calcined talc, 27 parts titanium dioxide, and 58 parts magnesium hydroxide; Alternatively, 5 parts kaolin, 10 parts calcined talc, 22 parts titanium dioxide, and 96 parts magnesium carbonate. Alternatively, 5 parts kaolin, 10 parts calcined talc, 27 parts titanium dioxide, and 86 parts sodium carbonate.

[0045] Specifically, when the raw materials in the predetermined formula include, by weight, 5 parts kaolin, 10 parts calcined talc, 22 parts titanium dioxide, and 63 parts magnesium hydroxide, the molar ratio of TiO2 to MgO is approximately 4:1. When the raw materials in the predetermined formula include, by weight, 5 parts kaolin, 10 parts calcined talc, 27 parts titanium dioxide, and 58 parts magnesium hydroxide, the molar ratio of TiO2 to MgO is approximately 3:1.

[0046] The titanium dioxide opacifier formulation of this application ensures the reaction between MgO and TiO2 by satisfying that the molar ratio of MgO to TiO2 is greater than or equal to 3.

[0047] In this embodiment, the powder is placed in a sagger and calcined. After calcination, the powder is removed and then pulverized to obtain a titanium dioxide opacifier, comprising: The powder is placed in a sagger and calcined at 1300°C. After calcination, it is cooled and removed, then ground to 200 mesh to obtain titanium dioxide opacifier.

[0048] For example, the step of determining the calcination temperature includes: drying the formulation materials, pulverizing them, and pressing them into 1cm powder on a test press. 3 Cubes of varying sizes were placed in a sintering point apparatus to measure the temperatures at which they began to shrink, rapidly shrink, and cease shrinking. The above-mentioned formulation was still shrinking at 1350℃. Therefore, calcining the powder at 1300℃ is already far above the operating temperature for calcining opacifiers.

[0049] The titanium dioxide opacifier provided in this application embodiment can be used in roller kilns with a temperature range of 1100~1140℃ as measured by the temperature measuring ring and a firing cycle of 35~65min.

[0050] This application also provides a titanium dioxide opacifier, wherein the titanium dioxide opacifier is prepared by the titanium dioxide opacifier preparation method described above.

[0051] This application also provides a base glaze, wherein the base glaze formulation includes a basic formulation and the titanium dioxide opacifier as described above. The basic formulation, by weight, includes: 8-15 parts kaolin, 10-20 parts potassium feldspar, 25-45 parts potassium sodium silicate, 10-32 parts frit, 8-15 parts quartz, 5-12 parts calcined talc, and 1-8 parts magnesium hydroxide; wherein each component of the basic formulation comprises 100 parts in total, and the titanium dioxide opacifier is added additionally to the basic formulation, with an addition amount of 15-20 parts.

[0052] Specifically, the total amount of the basic formula is 100 parts, and on this basis, 15-20 parts of titanium dioxide opacifier are added. The titanium dioxide opacifier prepared by calcination process melts the opacifying components together with the silicate, which greatly improves its stability; at the same time, the addition of magnesium hydroxide to the base glaze causes excess titanium oxide to react with magnesium oxide, avoiding the formation of rutile and further reducing the yellowing of the glaze. Therefore, magnesium hydroxide plays a role in eliminating yellowing in the base glaze.

[0053] This application uses a solid-state reaction method to prepare titanium dioxide opacifiers. The molar ratio of MgO to TiO2 is greater than or equal to 3, even reaching 4, and is fused into the calcined talc components, which improves the stability of the titanium dioxide opacifier. In addition, magnesium hydroxide is added to the base glaze formula to ensure that it does not yellow after inkjet printing, further improving the stability of the titanium dioxide base glaze during use.

[0054] In one embodiment of this application, the chemical composition of the melt, by mass percentage, includes: The composition is as follows: SiO2 60.5~65.3%, Al2O3 8.45~15.51%, ZrO2 3.12~7.25%, Fe2O3 0.1~0.2%, CaO 5.89~9.07%, MgO 3.64~7.17%, K2O 4.67~8.79%, Na2O 1.11~2.96%, with the balance being impurities.

[0055] In this application, SiO2 forms the basic framework of the glaze, creating a silicon-oxygen tetrahedral network structure that imparts high hardness, wear resistance, and chemical stability to the glaze layer. K2O and Na2O lower the melting point of the SiO2 network structure, promoting glaze melting at low temperatures. Al2O3 forms aluminum-oxygen tetrahedra embedded in the SiO2 network, enhancing the hardness and impact resistance of the glaze layer. MgO, as an intermediate oxide, regulates the melting range of the glaze, inhibits excessive grain growth, and improves the density of the glaze layer. ZrO2 improves the thermal stability of the glaze layer, inhibits crack propagation caused by rapid heating and cooling, and enhances resistance to chemical corrosion. CaO, as a flux, reduces the high-temperature viscosity of the glaze, promotes bubble removal, and improves the smoothness of the glaze surface.

[0056] The basic formula, by weight, includes: 11 parts kaolin, 12 parts potassium feldspar, 39 parts potassium sodium ore, 14 parts frit, 12 parts quartz, 6 parts calcined talc, and 6 parts magnesium hydroxide; 17 parts titanium dioxide opacifier are added to the basic formula.

[0057] Specifically, kaolin, potassium sodium stone, quartz, calcined talc, etc., are all natural minerals that have been refined, and their composition may vary.

[0058] For example, the chemical composition of the kaolin, by mass percentage, includes: 13.63% loss on ignition, 46.12% SiO2, 37.57% Al2O3, 0.88% Fe2O3, 0.24% TiO2, 0.22% CaO, 0.16% MgO, 0.76% K2O, 0.12% Na2O, with the balance being impurities.

[0059] The chemical composition of the potassium sodium stone, by mass percentage, includes: 0.72% loss on ignition, 79.46% SiO2, 12.31% Al2O3, 0.06% Fe2O3, 0.01% TiO2, 0.49% CaO, 0.07% MgO, 2.13% K2O, 4.35% Na2O, with the balance being impurities.

[0060] The chemical composition of the calcined talc, by mass percentage, includes: 0.74% loss on ignition, 63.31% SiO2, 0.19% Fe2O3, 1.48% CaO, 33.55% MgO, with the balance being impurities.

[0061] The chemical composition of the quartz, by mass percentage, includes: 0.32% loss on ignition, 97.79% SiO2, 1.08% Al2O3, 0.02% Fe2O3, 0.01% TiO2, 0.12% CaO, 0.08% MgO, 0.06% K2O, 0.22% Na2O, with the balance being impurities.

[0062] This application also provides a method for preparing a ceramic product, wherein the method for preparing the ceramic product includes: Apply the base glaze as described above to the ceramic body to form a base glaze layer; The ceramic body with a base glaze layer is processed into a glazed body; The glazed blank is fired in a kiln at a temperature of 1100~1140℃ for a period of 35~65 minutes to obtain a ceramic product.

[0063] Specifically, the surface of the dry-pressed ceramic body is cleaned, ash is blown off and water is sprayed, and a base glaze containing titanium dioxide opacifier is applied. The glaze slurry is ball-milled to a fineness of 0.2-0.4% residue on a 325-mesh sieve, the glaze slurry flow rate is about 35 seconds, the glaze slurry specific gravity is 1.70-1.75, and the glaze application amount is 330-430 grams per square meter.

[0064] The step "processing the ceramic body with the base glaze layer into a glaze body" specifically includes: inkjet printing the ceramic body with the base glaze layer, applying gold velvet glaze, full polished glaze, matte glaze, etc., to obtain a glaze body.

[0065] The titanium dioxide opacifier provided in this application can be used in roller kilns with a temperature range of 1100~1140℃ as measured by the temperature measuring ring and a firing cycle of 35~65min. Therefore, the firing temperature of the glaze blank in this application can be 1100~1140℃ and the firing cycle can be 35~65min.

[0066] This application also provides a ceramic product, wherein the ceramic product is prepared by the method described above.

[0067] The following is a specific example for illustration.

[0068] Step S1: Mix 4-8 parts kaolin, 5-15 parts calcined talc, 20-30 parts titanium dioxide, and 55-68 parts magnesium hydroxide by weight, or mix 4-8 parts kaolin, 5-15 parts calcined talc, 20-30 parts titanium dioxide, and 80-100 parts magnesium carbonate, and wet ball mill to obtain a slurry. Step S2: Spray-powder the slurry to obtain powder; Step S3: The powder is placed into a sagger and calcined at 1300°C. After calcination, it is cooled and removed, and then ground to 200 mesh to obtain titanium dioxide opacifier. Step S4: By weight, mix 11 parts kaolin, 12 parts potassium feldspar, 39 parts potassium sodium stone, 14 parts frit, 12 parts quartz, 6 parts calcined talc, and 6 parts magnesium hydroxide to form a base material; add 17 parts titanium dioxide opacifier to the base material and treat it to form a base glaze; the glaze slurry of the base glaze is ball-milled to a fineness of 0.2~0.4% residue on a 325-mesh sieve, the glaze slurry flow rate is about 35 seconds, the glaze slurry specific gravity is 1.70~1.75, and the glaze application amount is 330~430 grams / square meter; Step S5: Apply the base glaze to the ceramic body to form a base glaze layer; Step S6: The ceramic body with the base glaze layer is inkjet printed and then coated with gold velvet glaze, full polished glaze, and matte glaze to obtain a glazed body. Step S7: The glazed blank is fired in a kiln at a temperature of 1100~1140℃ for a period of 35~65 minutes to obtain a ceramic product.

[0069] This invention provides a titanium dioxide opacifier and its preparation method. The titanium dioxide opacifier and preparation method include: mixing raw materials according to a predetermined formula, wet ball milling to obtain a slurry, wherein the predetermined formula includes a titanium compound; spray-drying the slurry to obtain a powder; placing the powder into a sagger and calcining it; removing the calcined powder after calcination and then grinding it to obtain the titanium dioxide opacifier. This application calcines a titanium-containing opacifier formula to obtain a calcined titanium dioxide opacifier, thus preventing the formation of rutile in the base glaze and reducing the problem of yellowing of the glaze surface, eliminating the need for a separating glaze.

[0070] It should be understood that the application of the present invention is not limited to the examples above. Those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A method for the production of a titanium white opacifier, characterized in that, The preparation method of the titanium white opacifier comprises the following steps: After mixing raw materials according to a predetermined formula, wet ball milling is performed to obtain a slurry, wherein the predetermined formula comprises a titanium compound; Spray powdering is performed on the slurry to obtain a powder; The powder is loaded into a sagger and calcined, and after calcination, the powder is taken out and processed to obtain a titanium white opacifier.

2. The method for producing titanium white opacifier according to claim 1, characterized by, The predetermined formula further comprises kaolin, calcined talc and a magnesium compound; the titanium compound comprises titanium white and / or metatitanic acid; and the magnesium compound comprises magnesium hydroxide and / or magnesium carbonate.

3. The method of preparing titanium white opacifier according to claim 1, characterized in that, The raw materials of the predetermined formula comprise, by weight fraction: kaolin 4-8 parts, calcined talc 5-15 parts, titanium white 20-30 parts, magnesium hydroxide 55-68 parts; Alternatively, kaolin 4-8 parts, calcined talc 5-15 parts, titanium white 20-30 parts, magnesium carbonate 80-100 parts.

4. The method of preparing titanium white opacifier according to claim 1, characterized in that, The raw materials of the predetermined formula comprise, by weight fraction: kaolin 5 parts, calcined talc 10 parts, titanium white 22 parts, magnesium hydroxide 63 parts; Alternatively, kaolin 5 parts, calcined talc 10 parts, titanium white 27 parts, magnesium hydroxide 58 parts; Alternatively, kaolin 5 parts, calcined talc 10 parts, titanium white 22 parts, magnesium carbonate 96 parts; Alternatively, kaolin 5 parts, calcined talc 10 parts, titanium white 27 parts, sodium carbonate 86 parts.

5. The method of preparing titanium white opacifier according to claim 1, characterized in that, The powder is loaded into a sagger and calcined, and after calcination, the powder is taken out and processed to obtain a titanium white opacifier. The powder is loaded into a sagger and calcined at a temperature of 1300℃, and after calcination, the powder is taken out, ground to 200 mesh, and a titanium white opacifier is obtained.

6. A titanium white opacifier characterized in that, The titanium white opacifier is prepared by the preparation method of the titanium white opacifier according to any one of claims 1-5.

7. A base glaze characterized by, The formula of the base glaze comprises a basic formula and the titanium white opacifier according to claim 6; The basic formula comprises, by weight fraction: kaolin 8-15 parts, potassium feldspar 10-20 parts, potash feldspar 25-45 parts, frit 10-32 parts, quartz 8-15 parts, calcined talc 5-12 parts, magnesium hydroxide 1-8 parts; wherein the components of the basic formula are 100 parts in total, and the titanium white opacifier is additionally added in the basic formula in an amount of 15-20 parts.

8. The underglaze according to claim 7, wherein The chemical composition of the frit comprises, by mass fraction: SiO2 60.5-65.3%, Al2O3 8.45-15.51%, ZrO2 3.12-7.25%, Fe2O3 0.1-0.2%, CaO 5.89-9.07%, MgO 3.64-7.17%, K2O 4.67-8.79%, Na2O 1.11-2.96%, and the balance is impurities; The basic formula comprises, by weight fraction: kaolin 11 parts, potassium feldspar 12 parts, potash feldspar 39 parts, frit 14 parts, quartz 12 parts, calcined talc 6 parts, and magnesium hydroxide 6 parts; and 17 parts of the titanium white opacifier are additionally added in the basic formula.

9. A method for producing a ceramic product, characterized by, The preparation method of the ceramic product comprises: applying the base glaze according to any one of claims 7-8 on a ceramic body to form a base glaze layer; The ceramic body with the bottom glaze layer is processed into a glaze body; The glaze body is fired in a kiln, the firing temperature is 1100-1140℃, the firing period is 35-65min, and a ceramic product is obtained.

10. A ceramic product, characterized by, The ceramic product is prepared by the method for preparing a ceramic product according to claim 9.

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