A production process of a glaze with starlight effect after firing and ceramic tile

Abstract

The application discloses a glaze with starlight effect after firing and a production process of ceramic tiles, and mainly relates to the field of glazes, which comprises a base glaze and starlight particles which can present a starlight effect under light source irradiation after firing, wherein the starlight particles are obtained by melting, water quenching, crushing and screening raw materials, and the glaze is obtained by adding more than 2.5% of the starlight particles in the base glaze and mixing them uniformly. The glaze has a point-like starlight effect without polishing the glaze surface after firing. Through the cooperation of the starlight particles with specific chemical composition, particle size distribution and mass ratio, the application further improves the flatness effect and pollution resistance of the glaze surface, and overcomes the technical problems of pits and poor pollution resistance of the glaze surface in the prior art. Moreover, the preparation method of the further scheme is limited to a specific firing system, and the ceramic tiles obtained by the method have a water absorption rate of 0.5-3%, and are especially suitable for being laid on a wall surface, and can better reflect the unique point-like starlight effect of the stars with the light side irradiation.

Description

Technical Field

[0001] This invention relates to the field of ceramic tile production, and in particular to a glaze with a starlight effect after firing and a production process for ceramic tiles. Background Technology

[0002] In existing technologies, the shimmering effect on ceramic tile glazes is usually achieved by adding shimmering dry particles or by adding shimmering materials such as shimmering mica flakes, metal dry particles, and brick dry particles to the composition. These materials form protrusions on the ceramic tile surface, and the shimmering effect is achieved under light after polishing. At the same time, the shimmering effects on the glaze surface are quite diverse. One special decorative effect is a dotted starlight effect, which is difficult to achieve in terms of glaze decoration.

[0003] Patent No. ZL202210785238.4 discloses a method for preparing star-like dry granules, a method for preparing glazed ceramic tiles with a star-like effect, and their applications. The disclosed star-like glazed ceramic tiles exhibit a dotted star-like effect. This is achieved by polishing away the glassy phase of the raised portions of the star-like dry granules on the surface of the fired glazed ceramic tile, exposing the internal crystalline phase. The polished areas expose the crystals, resulting in a matte finish, while the recessed areas of the dry granules have a glossy finish, creating a bright-matte contrast to achieve the star-like effect. This method achieves the dotted star-like effect through the bright-matte contrast created by polishing. However, due to the actual presence of recessed dry granules, even after polishing, the glazed surface remains uneven, resulting in only moderate stain resistance.

[0004] This invention aims to achieve a glaze and ceramic tile with a starry, dotted effect through another technical means, which can save the polishing process. Summary of the Invention

[0005] The main objective of this invention is to propose a glaze with a star-like effect after firing, which achieves a dotted star effect without polishing after firing, thus saving on the preparation process. This overcomes the technical defect of star-like ceramic tiles in the prior art, which require polishing to achieve the dotted star effect. In a further solution, the invention improves the technical defect of uneven glaze surface, which results in poor stain resistance. Secondly, a secondary objective of this invention is to propose a production process for ceramic tiles with a star-like effect, and the resulting ceramic tiles have the aforementioned beneficial effects.

[0006] To achieve the above objectives, this invention proposes a glaze with a starlight effect after firing, comprising a base glaze and starlight particles that exhibit a starlight effect under light source illumination after firing. The starlight particles are added to the base glaze externally, and the two are mixed evenly to obtain a glaze with a starlight effect after firing. The starlight particles are frit particles obtained by melting, water quenching, crushing and screening raw materials, and the mass of the starlight particles accounts for ≥2.5% of the mass of the base glaze.

[0007] The star particles of this invention are crushed into star particles of varying sizes using a roller mill. Unlike general grinding and pulverization, roller crushing better preserves the sharp edges generated during the crushing of the molten particles, thereby producing mirror reflection. The star particles are added by first ball milling the raw materials of the base glaze into a slurry, then adding the star particles to the slurry, and then stirring and mixing evenly. This method of addition helps to maintain the external morphology of the star particles. When the added mass ratio of crushed star particles reaches 2.5% or more, they will not melt into the glaze surface due to insufficient mass ratio during the firing process. Instead, under the illumination of a light source, the broken edges of the star particles produce a dotted star effect under mirror reflection. The star effect is unrelated to polishing, and its unique dotted star effect is more evident, especially under the illumination of the side of the light source.

[0008] In one embodiment, the chemical composition of the star particles, by mass percentage, includes: SiO2 64.5-66.5%, Al2O3 17.5-19.0%, Fe2O3 0-0.2%, TiO2 0-0.1%, CaO 6.0-7.5%, MgO 0.5-1.5%, K2O 3.5-5.5%, Na2O 5.5-7.5%, and ZnO 0-1%; the particle size distribution of the star particles is: <63 μm: 8-10 wt%; 63-150 μm: 63-67 wt%; 150-200 μm: 23-27 wt%; >200 μm: 0-0.05 wt%, and the mass of the star particles accounts for 2.5% to 5% of the mass of the base glaze.

[0009] The star particles in this design have a higher silicon-to-aluminum ratio in their chemical composition compared to ordinary star particles. This, combined with the specific particle size distribution and the added mass ratio of the star particles, ensures that the star particles do not protrude from the surface. After firing, the star particles are evenly embedded under the glaze, eliminating the need for polishing. Under a light source, light enters the edges of the star particles under the glaze and reflects to create a dotted star effect similar to twinkling stars, resulting in a smoother glaze surface and better stain resistance.

[0010] In one embodiment, the chemical composition of the base glaze, by mass percentage, comprises: 45-50% SiO2, 17-22% Al2O3, 0.1-0.5% Fe2O3, 0.1-0.5% TiO2, 4-6% CaO, 3-5% MgO, 2.5-3.5% K2O, 0.8-2.0% Na2O, 2-4% ZnO, 10-16% BaO, and 1-3% SrO. Further preferred, the raw material composition of the base glaze, by weight parts, is as follows: 10-30 parts matte frit, 8-13 parts kaolin, 20-40 parts potassium feldspar, 5-10 parts sodium feldspar, 3-10 parts barium carbonate, 2-5 parts alumina, 2-5 parts talc, 5-15 parts limestone, 5-15 parts ultrafine quartz, and 4-8 parts dolomite; wherein, the matte frit comprises the following components by weight parts: 5-10 parts limestone, 3-10 parts barium carbonate, 35-45 parts potassium feldspar, 7-10 parts zinc oxide, 12-15 parts kaolin, 8-10 parts ultrafine quartz, 2-6 parts strontium carbonate, and 2-4 parts dolomite; the ultrafine quartz is quartz powder sieved through a 325-mesh sieve. With this specific chemical composition and raw material composition of the base glaze, the overall effect of the glaze is better when combined with the glaze material.

[0011] The present invention also proposes a production process for ceramic tiles with a starlight effect, including the step of applying a glaze with a starlight effect after firing, as described in any of the above schemes, to the surface of the ceramic body.

[0012] In one embodiment, a production process for ceramic tiles with a starlight effect includes the following steps:

[0013] S1) Printing is applied to the surface of the green body to form a brick blank with decorative patterns;

[0014] S2) Apply a glaze that produces a starlight effect after firing to the surface of the brick blank that forms the decorative pattern;

[0015] S3) is fired in a kiln;

[0016] S4) After the brick blanks are removed from the kiln, they are ground to obtain ceramic bricks with a starlight effect.

[0017] A further preferred firing regime is as follows: firing cycle 35-45 minutes; front temperature zone: surface temperature 420-1013℃, bottom temperature 448-972℃; middle temperature zone: surface temperature 1002-1120℃, bottom temperature 1035-1100℃; high temperature zone: surface temperature 1130-1135℃, bottom temperature 1130-1134℃. Through this specific firing regime, the water absorption rate of the starlight-effect ceramic tiles after firing is controlled to be 0.5-3%, making them particularly suitable for wall tiling. When illuminated from the side, their unique twinkling starlight effect is further enhanced.

[0018] In one embodiment, the chemical composition of the green body, by mass percentage, includes: SiO2 68.43%, Al2O3 17.55%, Fe2O3 1.75%, TiO2 0.37%, CaO 1.24%, MgO 0.98%, K2O 2.81%, Na2O 1.84%, and LOI 4.75%. This specific green body chemical composition helps maintain good green body strength even after reducing thickness, increasing area, and reducing weight, ultimately improving the yield of green bodies and reducing losses during ceramic tile production. Preferably, in step S4), the thickness of the starlight effect ceramic tile is ≤7.8mm.

[0019] Further preferably, before step S1), a base glaze is applied to the surface of the green body. The chemical composition of the base glaze, by mass percentage, includes: SiO2 62-70%, Al2O3 17-19.5%, Fe2O3 0.13-0.49%, TiO2 0.02-0.08%, CaO 0.78-1.23%, MgO 1.50-2.63%, ZrO 5.50-10.63%, K2O 1.01-1.64%, Na2O 1.99-3.85%, and LOI 3.73-3.92%. The base glaze in this invention uses a specific chemical composition, which facilitates the penetration of star-like particles into the base glaze and their embedding at different heights, forming a three-dimensional decorative effect similar to in-glaze painting.

[0020] Beneficial effects: Compared with the prior art, the present invention proposes a glaze with a starlight effect after firing. By adding more than 2.5% by mass of starlight particles that can present a starlight effect under light source to the base glaze, and by adding the starlight particles to the base glaze by crushing or by adding them externally, the angular external morphology of the starlight particle floc particles during crushing is better preserved. After firing, a glaze with a dotted starlight effect can be obtained without polishing.

[0021] By combining star-like particles with specific chemical composition, particle size distribution, and mass ratio, this invention further improves the smoothness and stain resistance of the glaze surface, overcoming the technical problems of pitted glaze surfaces and poor stain resistance proposed in the background technology. The star effect is better, and the preparation method of this further solution, after limiting a specific firing regime, yields ceramic tiles with a water absorption rate between 0.5% and 3%, which are especially suitable for wall tiling. When illuminated from the side by light, it can better reflect its unique dotted star effect. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 Comparison of existing ceramic tiles (bottom left) with those of Embodiments 1-3 of this invention (top right);

[0024] Figure 2 This is a schematic diagram showing different degrees of starlight effect on the glaze surface of the ceramic tile prepared according to the present invention.

[0025] Figure captions: 1-Starlight particles; 2-Dense region of starlight particles.

[0026] See attached diagram. Figure 1 The bottom left of the image shows a ceramic tile from the prior art, while the top right shows ceramic tiles prepared in Examples 1-3. The comparison shows that the glaze surface of this solution is smoother.

[0027] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0028] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the 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. In addition, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0029] The ceramic tiles prepared in the following examples and comparative examples were tested. The gloss was measured using a gloss meter. The green strength was determined by measuring the flexural strength of the green tiles cut into 600mm*600mm pieces. The water absorption rate after firing was determined according to the method for determining water absorption rate in GBT4100-2015. The stain resistance was determined according to the method for determining stain resistance in GBT3810.14-2016, Part 14.

[0030] In this invention, the smoothness of the glaze surface mainly refers to the unevenness of the ceramic tile glaze. The surface is polished, and technicians visually inspect the smoothness of the glaze, classifying it into four levels:

[0031] Grade 1: Its glaze surface has very few unevenness (the uneven part accounts for less than half of the glaze surface of the whole tile), reaching the level of paint surface, and the smoothness of the glaze surface is excellent.

[0032] Level 2: Its glaze has some unevenness (the uneven part accounts for about half to two-tenths of the glaze of the whole brick), the vertical height of the concave part is less than 0.1mm, which is not obvious to the naked eye, and the glaze surface is smooth.

[0033] Level 3; its glaze surface has large areas of unevenness (the uneven area accounts for about 20% to 60% of the glaze surface of the whole tile), the vertical height of the unevenness is between 0.1 and 0.5 mm, which can be observed with the naked eye, and the flatness of the glaze surface is generally average.

[0034] Level 4: The glaze surface of the entire brick is generally uneven (the uneven part accounts for more than 60% of the glaze surface of the entire brick), the vertical height of the uneven part is between 0.5 and 1 mm, which is obvious to the naked eye, and the flatness of the glaze surface is poor.

[0035] In this invention, the starlight texture is determined visually and can be evaluated from two dimensions: the starlight effect of starlight particles on the glaze surface and the three-dimensional effect within the glaze layer. It is further categorized as follows:

[0036] No star effect, meaning the glaze does not exhibit a dotted star effect;

[0037] The star effect is faint, meaning the glaze has a sparse, dotted star effect.

[0038] The star effect is good, that is, the dotted star effect on the glaze is relatively dense, creating a starry effect.

[0039] The star effect is remarkable, meaning that the density of the star effect dots on the glaze surface is optimal and evenly distributed, and the glaze surface presents a star effect all over the surface.

[0040] Starlight accumulation refers to the phenomenon where the starlight distribution is too dense and accumulates, which actually worsens the starlight effect and is usually accompanied by a decrease in the smoothness of the glaze surface.

[0041] Meanwhile, the starlight effect, if it has a three-dimensional effect within the glaze layer, is divided into two categories: having a three-dimensional effect and having a significant three-dimensional effect. Among them, having a significant three-dimensional effect means that the starlight particles are embedded under the glaze surface, and after firing, the glaze surface can present a three-dimensional decorative effect similar to in-glaze painting.

[0042] Example 1

[0043] A production process for starlight effect ceramic tiles includes the following steps:

[0044] S1) After obtaining the green body, prints are applied to the surface of the green body to form a brick body with decorative patterns;

[0045] This embodiment uses a common green body composition. The raw material composition of the green body in this embodiment, according to the following parts by weight, is as follows: 13 parts Dahe medium-temperature sand, 15 parts Xingzi high-temperature sand, 4 parts Yundu white clay, 2 parts Shuimu magnesia clay, 7 parts Jiangshui white clay, 4 parts Hefeng high-alumina sand, 7 parts Hongnan bentonite, 1 part Lanjun raw ore mud, 19 parts Xiagai medium-temperature sand, 2 parts Lanyu high-alumina slurry, 4 parts Wubai bentonite, 13 parts Jing marble powder, 3 parts Wuqing talc, 2 parts Yuejian wollastonite, and 4 parts Xishui sand. All raw materials are commercially available.

[0046] The chemical composition of the green body, by mass percentage, is: SiO2 69.13%, Al2O3 17.65%, Fe2O3 1.95%, TiO2 0.39%, CaO 1.16%, MgO 0.98%, K2O 2.71%, Na2O 1.61%, and LOI 4.42%.

[0047] In this embodiment, the raw materials for the billet are prepared by batching and ball milling to obtain a slurry, then iron removal, sieving, aging, spray powdering and sieving again to obtain the billet, which is then pressed and dried to obtain a green billet of a predetermined specification. The above are known in the art and will not be described in detail here.

[0048] In this embodiment, after drying, the green blank is conveyed to an inkjet printer equipped with a digital mold, and the mold texture layer is printed on the surface of the green blank according to the required design. Then, the above-mentioned product is conveyed to an inkjet printer equipped with colored ink for inkjet printing to obtain the final decorative pattern. Those skilled in the art can also form decorative patterns through other known printing methods, and are not limited to the implementation of this solution.

[0049] S2) Apply a glaze that produces a starlight effect after firing to the surface of the brick blank that forms the decorative pattern;

[0050] In step S2), star particles are added to the base glaze by means of an external addition at a certain mass ratio (mass percentage of added star particles = mass of star particles / mass of dry base glaze * 100%). After the two are mixed evenly, a glaze with a star effect is obtained after firing. The glaze application rate is 250 g / m². 2 The specific method of adding the additive involves first ball milling the raw materials of the base glaze into a slurry, then adding starlight particles to the slurry, and finally stirring and mixing them evenly.

[0051] The star particles are fused particles obtained by melting, water quenching, crushing, and screening raw materials. In this embodiment, the crushing is performed by two roller mills. The chemical composition of the star particles, by mass percentage, is: SiO2 64.5%, Al2O3 17.5%, Fe2O3 0.2%, TiO2 0.1%, CaO 6.0%, MgO 0.5%, K2O 3.5%, Na2O 6.7%, and ZnO 1%. During the screening stage, the particle size distribution of the star particles is controlled by screening to be between <63 micrometers, 63-150 micrometers, 150-200 micrometers, and >200 micrometers.

[0052] The raw material composition of the base glaze is as follows, by mass parts: 24 parts matte frit, 12 parts kaolin, 20 parts potassium feldspar, 5 parts sodium feldspar, 10 parts barium carbonate, 5 parts alumina, 4 parts calcined talc, 5 parts limestone, 9 parts ultrafine quartz, and 6 parts dolomite; the ultrafine quartz is quartz powder that has passed through a 325-mesh sieve.

[0053] The matte frit comprises the following components by weight: 9 parts limestone, 10 parts barium carbonate, 43 parts potassium feldspar, 9 parts zinc oxide, 12 parts kaolin, 9 parts ultrafine quartz, 6 parts strontium carbonate, and 2 parts calcined talc.

[0054] The chemical composition of the base glaze, by mass percentage, is: SiO2 46.6%, Al2O3 19.7%, Fe2O3 0.3%, TiO2 0.2%, CaO 5.1%, MgO 3.4%, K2O 3.2%, Na2O 1.2%, ZnO 3.2%, BaO 15.3%, and SrO 1.8%.

[0055] S3) The kiln is then fired, with the following firing regime: front temperature zone: surface temperature 420-1013℃, bottom temperature 448-972℃; middle temperature zone: surface temperature 1002-1120℃, bottom temperature 1035-1100℃; high temperature zone: surface temperature 1130-1135℃, bottom temperature 1130-1134℃, firing time 35-45min;

[0056] S4) After the brick blanks are removed from the kiln, they are ground to produce starlight effect ceramic tiles with the following specifications: thickness of 12.0 mm, length × width of 0.6 m × 1.2 m, and weight of 19.5 KG.

[0057] The performance of the prepared starlight effect ceramic tiles was tested.

[0058] The specific embodiments in Example 1, with varying parameters, are shown in the table below:

[0059]

[0060] Performance testing was performed on the above embodiments, and the results are shown in the table below:

[0061] Serial Number glaze smoothness Glossiness (°) Starlight texture Stain resistance Example 1-1 Level 1 21 The starlight effect is good. Level 5 Examples 1-2 Level 1 21 The starlight effect is good. Level 5 Examples 1-3 Level 2 23 The starlight effect is remarkable. Level 5 Examples 1-4 Level 2 24 The starlight effect is remarkable. Level 5 Examples 1-5 Level 2 23 The starlight effect is good. Level 4 Examples 1-6 Level 1 22 The starlight effect is weak. Level 5

[0062] As can be seen from the above data, the smoothness of the glaze surface decreases with the increase of the added mass ratio of starlight particles. Experiments showed that when the added mass ratio of starlight particles was between 2.5% and 5%, and the particle size distribution was as follows: <63 micrometers: 8-10 wt%; 63-150 micrometers: 63-67 wt%; 150-200 micrometers: 23-27 wt%; >200 micrometers: 0-0.05 wt%, the starlight effect on the fired glaze was good, and the smoothness of the glaze surface reached level two or above, not noticeable to the naked eye, and the stain resistance reached level 5. Based on the overall effect evaluation, Examples 1-3 showed the best results, with the highest density and most uniform distribution of the starlight effect, resulting in a full-surface starlight effect. Furthermore, Examples 1-3 were more visually appealing and had the best light perception. Figure 1 The image shows a comparison of existing ceramic tiles (bottom left) and embodiments 1-3 of the present invention (top right). It can be seen that the glaze of the embodiments of the present invention is significantly more delicate and smooth, while the glaze of the existing technology has obvious pits.

[0063] Compared with Examples 1-3, when the overall particle size is larger, such as in Examples 1-5, the star effect and smoothness of the glaze decrease, and the stain resistance is further reduced; when the overall particle size is smaller, such as in Examples 1-6, the smoothness of the glaze increases, but the star effect is significantly weakened.

[0064] Comparative Example 1

[0065] Comparative Example 1-1: All parameters and preparation steps in this example are consistent with those in Examples 1-3, except that the mass ratio of starlight particles is 1%.

[0066] Comparative Examples 1-2: The parameters and preparation steps in this example are consistent with those in Examples 1-3, except that the mass ratio is 8%.

[0067] Comparative Examples 1-3: The parameters and preparation steps of this example are consistent with those of Examples 1-3, except that the chemical composition of the star particles, by mass percentage, is: SiO2 62.68%, Al2O3 19.11%, Fe2O3 0.11%, TiO2 0.05%, CaO 5.97%, MgO 0.11%, K2O 4.29%, Na2O 7.62%, and ZnO 0.06%.

[0068] Comparative Examples 1-4: The parameters and preparation steps of this example are consistent with those of Examples 1-3, except that the chemical composition of the base glaze, by mass percentage, is: SiO2 64.64%, Al2O3 11.29%, Fe2O3 0.23%, TiO2 0.04%, CaO 8.65%, MgO 1.21%, K2O 5.58%, Na2O 1.25%, ZnO 3.2%, BaO 0.25%, B2O3 1.02%, and LOI 2.64%.

[0069] The performance of the above comparative examples was tested, and the test results are shown in the table below:

[0070] Serial Number glaze smoothness Glossiness (°) Starlight texture Stain resistance Examples 1-3 Level 2 23 The starlight effect is remarkable. Level 5 Comparative Example 1-1 Level 1 21 No starlight effect Level 5 Comparative Examples 1-2 Level 3 24 Starlight Accumulation Level 4 Comparative Examples 1-3 Level 2 25 No starlight effect Level 5 Comparative Examples 1-4 Level 2 17 The starlight effect is weak. Level 3

[0071] Comparing the data in the table above, it can be seen that when the mass ratio of starlight particles is less than 2.5%, as in Comparative Example 1-1, the starlight effect disappears; when the mass ratio of starlight particles is too high, as in Comparative Example 1-2, the smoothness of the glaze surface deteriorates significantly, starlight accumulation occurs, and the aesthetic appeal decreases. When the added mass ratio of starlight particles is greater than 5%, as in Comparative Example 1-2, the smoothness of the glaze surface drops to level three, meaning that large areas of the glaze surface have visible unevenness.

[0072] Compared with Examples 1-3, when the silicon-aluminum ratio in the chemical composition of the star particles is low, such as in Comparative Examples 1-3, the glaze surface does not have a star effect after firing. When the chemical composition of the star particles is SiO2 64.5-66.5%, Al2O3 17.5-19.0%, Fe2O3 0-0.2%, TiO2 0-0.1%, CaO 6.0-7.5%, MgO 0.5-1.5%, K2O 3.5-5.5%, Na2O 5.5-7.5%, and ZnO 0-1%, the star particles obtained after being quenched, crushed, and sieved in molten water within this specific range are added to the base glaze. After firing, polishing is not required, and the glaze surface presents a dotted star effect through mirror reflection under light.

[0073] When the chemical composition of the base glaze is changed, as in Comparative Examples 1-4, the gloss level drops to 17° after firing, and the star effect is significantly weakened. The area of ​​the uneven parts of the glaze surface increases, but the smoothness of the glaze surface can still be maintained at level two, and the stain resistance is significantly reduced. The base glaze in the original Examples 1-3, with the following chemical composition: SiO2 45-50%, Al2O3 17-22%, Fe2O3 0.1-0.5%, TiO2 0.1-0.5%, CaO 4-6%, MgO 3-5%, K2O 2.5-3.5%, Na2O 0.8-2.0%, ZnO 2-4%, BaO The base glaze composition, by weight, is as follows: 10-16% and SrO 1-3%, with the following proportions: 10-30 parts matte frit, 8-13 parts kaolin, 20-40 parts potassium feldspar, 5-10 parts sodium feldspar, 3-10 parts barium carbonate, 2-5 parts alumina, 2-5 parts talc, 5-15 parts limestone, 5-15 parts ultrafine quartz, and 4-8 parts dolomite; wherein, the matte frit comprises the following proportions by weight... The composition consists of: 5-10 parts limestone, 3-10 parts barium carbonate, 35-45 parts potassium feldspar, 7-10 parts zinc oxide, 12-15 parts kaolin, 8-10 parts ultrafine quartz, 2-6 parts strontium carbonate, and 2-4 parts dolomite. The ultrafine quartz is quartz powder that has passed through a 325-mesh sieve. It can form a good match with the aforementioned star particles in a specific ratio, resulting in a smooth glaze surface, higher stain resistance, and a better star effect.

[0074] Example 2

[0075] All parameters and preparation steps in this embodiment are consistent with those in Examples 1-3, except that: before step S1), a base glaze is applied to the surface of the green body, with a glaze application amount of 400g / m². 2 .

[0076] The chemical composition of the base glaze, by mass percentage, is as follows: SiO2 64.98%, Al2O3 18.42%, Fe2O3 0.13%, TiO2 0.02%, CaO 1%, MgO 1.50%, ZrO 5.50%, K2O 1.01%, Na2O 3.71%, and LOI 3.73%.

[0077] Performance testing was performed on the above embodiments, and the results are shown in the table below:

[0078] Serial Number glaze smoothness Glossiness (°) Starlight texture Stain resistance Examples 1-3 Level 2 23 degrees The starlight effect is remarkable. Level 5 Example 2 Level 2 23 degrees Both the starlight effect and the 3D effect are remarkable. Level 5

[0079] Comparing the data in the table above, it can be seen that Example 2 has a three-dimensional decorative effect similar to that of in-glaze painting compared to Examples 1-3.

[0080] When the chemical composition of the base glaze, by mass percentage, is: SiO2 62-70%, Al2O3 17-19.5%, Fe2O3 0.13-0.49%, TiO2 0.02-0.08%, CaO 0.78-1.23%, MgO 1.50-2.63%, ZrO 5.50-10.63%, K2O 1.01-1.64%, Na2O 1.99-3.85%, and LOI 3.73-3.92%, it has the three-dimensional decorative effect of the in-glaze color in Example 2.

[0081] Comparative Example 2

[0082] All parameters and preparation steps in this comparative example are consistent with those in Examples 1-3. The difference is that in step S2), the star particles are not added to the base glaze by external means, but the base glaze and the raw materials of the star particles are ball-milled together into a slurry.

[0083] Performance testing was performed on Comparative Example 2, and the results are shown in the table below:

[0084]

[0085] Comparing the data in the table above, it can be seen that after ball milling, the smoothness of the glaze surface in Comparative Example 2 is improved compared to Examples 1-3. However, due to the change in the external morphology of the particles caused by ball milling, the gloss of the glaze surface decreases and it does not have a star effect.

[0086] Example 3

[0087] Example 3-1: The parameters and preparation steps in this example are consistent with those in Examples 1-3. The difference is that after firing, the ceramic brick has the following specifications: thickness 7.8mm, length × width 0.6m x 1.2m, and weight 12.2KG.

[0088] Example 3-2: The parameters and preparation steps of this example are consistent with those of Examples 1-3, except that the ceramic tile specifications are: thickness 5.0mm, length × width 1.0m × 1.0m, and weight 10.8KG.

[0089] Example 3-3: The parameters and preparation steps in this example are consistent with those in Example 3-1, except that:

[0090] The raw materials for the green bricks, in parts by weight, are as follows: 13 parts Jintun medium-temperature sand, 10.2 parts Xingyuan high-temperature sand, 3 parts Yundu white clay, 1 part Shuimu magnesia clay, 4.5 parts Xiwang white clay, 4 parts Hefeng high-alumina sand, 9 parts Xinyu bentonite, 1 part Lanjun raw ore mud, 19 parts Xiagai medium-temperature sand, 2 parts Lanyu high-alumina mortar, 6.5 parts Wubai bentonite, 4 parts broken brick particles, 14.3 parts Jing marble powder, 2.1 parts Wuqing talc, 1.4 parts Yuejian wollastonite, and 5 parts Xishui sand; all raw materials are commercially available.

[0091] The chemical composition of the green body, by mass percentage, is as follows: SiO2 68.43%, Al2O3 17.55%, Fe2O3 1.75%, TiO2 0.37%, CaO 1.24%, MgO 0.98%, K2O 2.81%, Na2O 1.84%, and LOI 5.03%.

[0092] Examples 3-4: The parameters and preparation steps of this example are consistent with those of Example 3-3, except that the ceramic tile specifications are: thickness 5.0mm, length × width 1.0m × 1.0m, and weight 10.8kg.

[0093] Performance testing was performed on the above embodiments, and the results are shown in the table below:

[0094] Serial Number glaze smoothness Glossiness (°) Starlight texture Stain resistance Examples 1-3 Level 2 23 The starlight effect is remarkable. Level 5 Example 3-1 Level 2 23 The starlight effect is remarkable. Level 5 Example 3-2 — — — — Example 3-3 Level 2 23 The starlight effect is remarkable. Level 5 Examples 3-4 Level 1 25 The starlight effect is remarkable. Level 5

[0095] The green strength and post-firing water absorption of the aforementioned examples were tested, and the results are shown in the table below:

[0096]

[0097]

[0098] According to the data in the table above, after using the green body in Example 3-3, the green body strength was significantly improved to 1.8 MPa compared to Example 3-1, which can ensure normal production. After further reducing the thickness and increasing the specifications to: ceramic tile thickness of 5 mm and length × width of 1.0 m × 1.0 m, the green body strength of Example 3-4 is relatively stable, with a green body strength of 1.6 MPa, showing a small decrease. However, comparing the data of Example 3-1 with that of Example 1-3, it can be seen that when the thickness is reduced to 7.8 mm, the ceramic tile can still be formed and fired, but the green body strength drops significantly to 1.15 MPa, the water absorption rate after firing is also low, there are more defective green bodies during the production process, and the production stability is poor. When the thickness is further reduced to 5 mm, as in Example 3-2, the green body strength is insufficient and cannot be formed, which is a defective product.

[0099] When the chemical composition of the green body, by mass percentage, is: SiO2 68.43%, Al2O3 17.55%, Fe2O3 1.75%, TiO2 0.37%, CaO 1.24%, MgO 0.98%, K2O 2.81%, Na2O 1.84%, and LOI 4.75%, the weight is lighter when the ceramic tile thickness is reduced to 5mm and the area is further increased to 1 square meter, while the green body strength can still be maintained at 1.6 MPa or higher. This helps to improve the yield of green bodies and reduce green body loss when preparing ceramic tiles with a starlight effect. Tiles with a starlight effect are more suitable for wall tiling than floor tiling, and the starlight effect is better displayed when illuminated from the side by lighting. Currently produced tiles have a water absorption rate of less than 0.5%. If used for wall tiling, grooves need to be cut on the back of the tile for hooks, and tile adhesive needs to be used to prevent the tile from falling off. To facilitate better wall installation, we control the water absorption rate of our tiles to 0.5-3%, and the tile thickness to approximately 7.8mm, reducing the overall weight of the tile. Even tiles measuring 600mm x 1200mm can be installed using only ceramic adhesive. Preferred embodiments 3-4 exhibit a significant starlight effect, achieving a level 5 stain resistance, high glaze smoothness, and a relatively thin yet large surface area, facilitating wall installation and further showcasing the starlight effect.

[0100] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A glaze that exhibits a starlight effect after firing, characterized in that, The glaze comprises a base glaze and starlight particles that, after firing, exhibit a starlight effect under light. The starlight particles are added to the base glaze externally, and the two are mixed evenly to obtain the glaze with a starlight effect after firing. The star particles are frit particles obtained by melting, water quenching, crushing and screening the raw materials. The mass of the star particles accounts for ≥2.5% of the mass of the base glaze. The chemical composition of the star particles, by mass percentage, includes: SiO2 64.5-66.5%, Al2O3 17.5-19.0%, Fe2O3 0-0.2%, TiO2 0-0.1%, CaO 6.0-7.5%, MgO 0.5-1.5%, K2O 3.5-5.5%, Na2O 5.5-7.5%, and ZnO 0-1%. The particle size distribution of the star particles is as follows: <63 micrometers: 8-10 wt%; 63-150 micrometers: 63-67 wt%; 150-200 micrometers: 23-27 wt%; >200 micrometers: 0-0.05 wt%. The mass of the star particles accounts for 2.5% to 5% of the mass of the base glaze. The chemical composition of the base glaze, by mass percentage, includes: SiO2 45-50%, Al2O3 17-22%, Fe2O3 0.1-0.5%, TiO2 0.1-0.5%, CaO 4-6%, MgO 3-5%, K2O 2.5-3.5%, Na2O 0.8-2.0%, ZnO 2-4%, BaO 10-16%, and SrO 1-3%.

2. The glaze with a starlight effect after firing as described in claim 1, characterized in that, The raw material composition of the base glaze, in parts by weight, is as follows: 10-30 parts of matte frit, 8-13 parts of kaolin, 20-40 parts of potassium feldspar, 5-10 parts of sodium feldspar, 3-10 parts of barium carbonate, 2-5 parts of alumina, 2-5 parts of talc, 5-15 parts of limestone, 5-15 parts of ultrafine quartz, and 4-8 parts of dolomite. The matte frit comprises the following components by weight: 5-10 parts limestone, 3-10 parts barium carbonate, 35-45 parts potassium feldspar, 7-10 parts zinc oxide, 12-15 parts kaolin, 8-10 parts ultrafine quartz, 2-6 parts strontium carbonate, and 2-4 parts dolomite; the ultrafine quartz is quartz powder that has passed through a 325-mesh sieve.

3. A production process for ceramic tiles with a starlight effect, characterized in that, The step includes applying a glaze that has a star-like effect after firing, as described in any one of claims 1-2, to the surface of the blank.

4. The production process of ceramic tiles with starlight effect as described in claim 3, characterized in that, Including the following steps: S1) Printing is applied to the surface of the green body to form a brick blank with decorative patterns; S2) Apply the glaze that has a starlight effect after firing to the surface of the brick blank that forms the decorative pattern; S3) is fired in a kiln; S4) After the brick blanks are removed from the kiln, they are ground to obtain ceramic bricks with a starlight effect.

5. The production process of ceramic tiles with starlight effect as described in claim 4, characterized in that, The firing process is as follows: firing cycle 35-45 minutes; front temperature zone: surface temperature 420-1013℃, bottom temperature 448-972℃; middle temperature zone: surface temperature 1002-1120℃, bottom temperature 1035-1100℃; high temperature zone: surface temperature 1130-1135℃, bottom temperature 1130-1134℃.

6. The production process of ceramic tiles with starlight effect as described in any one of claims 3 or 5, characterized in that, The chemical composition of the green body, by mass percentage, includes: SiO2 68.43%, Al2O3 17.55%, Fe2O3 1.75%, TiO2 0.37%, CaO 1.24%, MgO 0.98%, K2O 2.81%, Na2O 1.84%, and LOI 5.03%.

7. The production process of ceramic tiles with starlight effect as described in claim 6, characterized in that, In step S4), the thickness of the starlight effect ceramic tile is ≤7.8mm.

8. The production process of a ceramic tile with a starlight effect as described in claim 3, characterized in that, Before step S1), a base glaze is applied to the surface of the green body. The chemical composition of the base glaze, by mass percentage, includes: SiO2 62-70%, Al2O3 17-19.5%, Fe2O3 0.13-0.49%, TiO2 0.02-0.08%, CaO 0.78-1.23%, MgO 1.50-2.63%, ZrO 5.50-10.63%, K2O 1.01-1.64%, Na2O 1.99-3.85%, and LOI 3.73-3.92%.

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