Ceramic tile with positioning and brightening effect and production process thereof

Abstract

The application discloses a ceramic tile with a positioning brightening effect and a production process, and relates to the field of ceramic tile production. A protective glaze is applied on the surface of a green tile, and a brightening glaze is applied on a preset area to form a granular decorative effect. After firing, the surface is polished and ground to obtain the ceramic tile with the positioning brightening effect. The brightening glaze is prepared by adding corundum powder into the protective glaze. The addition amount of the corundum powder in the brightening glaze is 2-2.5% of the dry material mass of the protective glaze, and the particle size of the corundum powder is 38-45 microns. After firing, the brightening glaze applied at the preset position forms a three-dimensional protrusion at the granular point. After polishing and grinding, a bright surface is formed at the granular point, and a brightness difference of more than 15 degrees is formed between the bright surface and other positions on the tile surface, which is close to the brightness difference effect of a terrazzo and has good ornamental property. Meanwhile, the wear resistance is improved, and the ceramic tile can meet the requirements of most daily scenes.

Description

Technical Field

[0001] This invention relates to the field of ceramic tile production, and in particular to a ceramic tile with a positioning and brightening effect and its production process. Background Technology

[0002] Terrazzo has high-gloss decorative particles on its surface, giving it a unique decorative effect. It is a common surface decoration material, but as a concrete or resin-based artificial stone product, its stain resistance, strength, and wear resistance are lower than those of ceramic tiles, so it can only be used in some specific scenarios.

[0003] In conventional terrazzo production processes, the surface particles (crushed stone, glass, quartz, etc.) and the binder (cement or epoxy binder) have different hardness and gloss. Under the same polishing process, the brightness of the surface after polishing is different. The surface brightness at the particle points will be significantly higher than that of the binder, with the brightness difference often exceeding 15°.

[0004] In existing technologies, to achieve a terrazzo-like decorative effect on ceramic tiles, a significant amount of fluxing agents is added to the protective glaze on the tile surface to form a low-temperature glaze. The protective glaze is then applied first, followed by targeted application of the low-temperature glaze. After firing, the tiles are polished to obtain the terrazzo-like ceramic tile product. While this technology can create a glossy effect similar to terrazzo, it presents two intractable problems:

[0005] 1. The abrasion resistance of low-temperature protective glaze with more flux is reduced to level 3 at 750 revolutions (GB / T3810.7-2016 Test Methods for Ceramic Tiles Part 7: Determination of Abrasion Resistance of Glazed Tiles), which cannot meet the needs of most daily use scenarios.

[0006] 2. Because the glazes are applied alternately at two different firing temperatures, the glazes do not blend well, which will affect the appearance of the bricks to some extent. Summary of the Invention

[0007] The main objective of this invention is to propose a ceramic tile and its production process with a positioning and brightening effect. This process can produce a ceramic tile with a brightness difference of more than 15° between the glaze and the particle points, which has good aesthetic appeal and improved wear resistance. This tile can meet the needs of most daily use scenarios and overcomes the technical problem that the wear resistance of the protective glaze in existing terrazzo ceramic tiles decreases at low temperatures, thus failing to meet the needs of most daily applications.

[0008] A secondary objective of this invention is to provide a ceramic brick that has the aforementioned advantages.

[0009] To achieve the above objectives, this invention proposes a production process for ceramic tiles with a targeted brightening effect, comprising the following steps: first, applying a protective glaze to the surface of the tile blank, and then applying a brightening glaze. The brightening glaze is prepared by adding corundum powder to the protective glaze. The brightening glaze is applied at predetermined points in a preset area to form a granular decorative effect. After firing, the surface is polished to obtain ceramic tiles with a targeted brightening effect. The amount of corundum powder added to the brightening glaze is 2-2.5% of the dry weight of the protective glaze, and the particle size of the corundum powder is 38-45 micrometers.

[0010] The inventive concept of this invention is to apply a brightening glaze at specific points on a protective glaze, followed by polishing after firing, to obtain ceramic tiles with targeted brightening. Unlike existing technologies that apply low-temperature glazes, the brightening glaze of this invention increases the aluminum content and firing temperature of the glaze by adding corundum powder of a specific particle size and mass ratio to the protective glaze. After firing, the targeted brightening glaze forms three-dimensional protrusions at the particle points. These protrusions can be smoothed out using conventional polishing processes, resulting in good flatness and a distinctly bright surface. This creates a significant brightness difference of more than 15° compared to other areas of the tile surface, resulting in excellent aesthetics. At the same time, it improves the wear resistance of the glaze surface, making the application scenarios of the terrazzo-like ceramic tiles less restrictive and meeting the needs of most daily use scenarios.

[0011] Preferably, it also includes a step of printing on the surface of the brick blank. After the printing forms a preset pattern, a protective glaze and a brightening glaze are applied. The application area of ​​the brightening glaze corresponds to the preset pattern formed by the printing. The polishing process parameters are as follows: using 6-10 sets of 3000-grit elastic abrasive blocks, 10-14 sets of 5000-grit elastic abrasive blocks, with a pressure of 1-2 kg; using 10-15 sets of sharp 240-grit sponge polishers, and 25-30 sets of conventional 240-grit sponge polishers, with a pressure of 0.3-0.6 kg. The proportion of inorganic abrasive added in the sharp sponge polisher is 15-25% higher than that in the conventional sponge polisher. Under the same conditions, the sharp sponge polisher has a greater polishing force on the brick surface. The preferred polishing process parameters of this invention have an appropriate cutting amount, which can effectively remove most of the raised brightening glaze and perform a certain polishing treatment on the surface of the brick blank. This makes the height difference between the two not noticeably perceptible to the naked eye and touch, ensuring the flatness of the brick surface while creating a more significant brightness difference, resulting in a very good aesthetic effect.

[0012] A further preferred embodiment includes a step of applying a protective wax to the surface of the brick blank after polishing. When using the preferred polishing process parameters of this invention, the original closed pores on the brick surface are not excessively damaged; therefore, applying a small amount of protective wax is sufficient to achieve effective stain prevention and save costs.

[0013] Preferably, a base glaze is applied to the surface of the brick before printing. The base glaze further enriches the layering of the printed pattern.

[0014] A further preferred embodiment involves applying a colored glaze, which will be applied after firing, after the pre-designed pattern has been printed on the surface of the brick blank. The colored glaze further enriches the color richness, vibrancy, and layering of the pattern.

[0015] Preferably, the chemical composition of the protective glaze, by mass percentage, is: SiO2 42-45%, Al2O3 18-22%, Fe2O3 0-0.3%, CaO 6.5-8.0%, MgO 2.0-3.0%, BaO 8.0-9.0%, ZnO 2.0-2.5%, K2O 2.0-2.5%, Na2O 3.0-3.5%, and ZrO2 0.5-1.0%, with the remainder being loss on ignition.

[0016] Preferred, the raw material composition of the protective glaze includes the following components by weight: 30-35 parts potassium feldspar, 8-12 parts kaolin, 8-12 parts calcined kaolin, 6-8 parts quartz, 15-20 parts dolomite, 4-6 parts calcined talc, 4-6 parts barium carbonate, 6-8 parts zinc oxide and 6-8 parts aluminum oxide.

[0017] The firing process is as follows: firing temperature 1185℃-1225℃, firing cycle 55-65 minutes.

[0018] The preferred protective glaze of this invention has a high aluminum content and firing temperature, and a long firing cycle. The brightening glaze with added corundum powder blends well with the protective glaze during firing. If the firing temperature is too low or the firing time is too short during the firing process, the brick body is prone to incomplete sintering. This not only affects the physicochemical properties of the brick body, but also reduces the overall brightness difference due to the incomplete sintering of the protective glaze and brightening glaze, thus reducing its aesthetic appeal.

[0019] A further preferred firing regime is: a firing temperature of 1200℃-1215℃ and a firing cycle of 58-62 minutes. Within this preferred firing regime, the ceramic tiles exhibit better sintering and superior glaze integration.

[0020] Preferably, the application amount of the protective glaze is 200-400 g / m², and the application amount of the brightening glaze is 100-130 g / m². In this invention, if the glaze layer is too thin, it is easy to over-polish during polishing, affecting the surface effect and reducing the stain resistance; if the glaze layer is too thick, it will affect the transparency of the brick surface and reduce its aesthetic value. In this invention, the application amount of the brightening glaze is small and thin, which basically does not affect the clarity and transparency of the brick surface, and can be applied to fine texture patterns.

[0021] More preferably, the protective glaze and the brightening glaze are applied by screen printing, with each application amount being 100-130 g / m². More preferably, the protective glaze is applied 2-4 times, and the brightening glaze is applied once.

[0022] This invention also proposes a ceramic tile, prepared using the production process of ceramic tiles with a positioning and brightening effect described in any of the above-mentioned schemes. It possesses the beneficial effects of the aforementioned schemes, which will not be elaborated upon here. Detailed Implementation

[0023] 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.

[0024] The ceramic tile products prepared in the following examples and comparative examples were tested. The gloss was measured using a visible light spectrophotometer. The brightness difference was the difference between the gloss of the particle point and the gloss of the tile surface. When the minimum brightness difference was greater than or equal to 15°, the decorative effect after the brightening was better. When the minimum brightness difference was less than 15° and the maximum brightness difference was greater than 15°, the decorative effect after the brightening was average. When the maximum brightness difference was less than 15°, the decorative effect after the brightening was poor.

[0025] The abrasion resistance was tested according to GB / T3810.7-2016 "Test Methods for Ceramic Tiles Part 7: Determination of Abrasion Resistance of Glazed Tiles"; the flatness was tested according to GB / T4100-2006, the national standard for ceramic tiles; and the stain resistance was tested according to the company's internal control standards. For ease of testing, a large area of ​​light gray was used for all particle points. The specific testing method was as follows: after drawing on a fixed position on the tile surface with a blue marker, the tile was wiped with alkaline sand. If no blue ink residue was found after three consecutive attempts, the tile was considered to be qualified.

[0026] Regarding the compatibility of brightening glaze and protective glaze:

[0027] Excellent blending properties: After firing, the interface between the brightening glaze and the protective glaze melts and does not spread, resulting in accurate positioning, clear boundaries, and excellent three-dimensionality.

[0028] Good blending properties: After firing, there are no obvious differences in glaze height or blurred boundaries at the interface between the brightening glaze and the protective glaze.

[0029] Poor integration: After firing, the brightening glaze melts and collapses, spreading circumferentially towards the protective glaze with obvious irregular boundaries.

[0030] Example 1-1

[0031] A ceramic tile with a targeted brightening effect is provided, and the production process is as follows:

[0032] After pressing the brick blank into shape using a known process (specifications: 1.230m x 0.678m, thickness 13.2mm), a terrazzo texture pattern is printed on the surface of the brick blank. A protective glaze is then applied to the surface of the brick blank, followed by a brightening glaze. The brightening glaze is applied at predetermined points in a pre-defined area to create a granular decorative effect. After firing, the surface is polished to obtain a ceramic tile with a targeted brightening effect.

[0033] In this embodiment, the chemical composition of the protective glaze, by mass percentage, is: SiO2 44.13%, Al2O3 21.30%, Fe2O3 0.2%, CaO 7.75%, MgO 3.09%, BaO 8.36%, ZnO 2.32%, K2O 2.33%, Na2O 3.35%, and ZrO2 0.85%, with the remainder being loss on ignition.

[0034] The raw material composition of the protective glaze includes the following components by weight: 33 parts potassium feldspar, 10 parts kaolin, 10 parts calcined kaolin, 8 parts quartz, 15 parts dolomite, 5 parts calcined talc, 6 parts barium carbonate, 7 parts calcined zinc oxide and 6 parts calcined alumina, plus 60 parts printing oil, 30 parts printing paste, 8 parts water, 0.2 parts sodium tripolyphosphate and 0.3 parts sodium carboxymethyl cellulose. The above raw materials are ball-milled and passed through a 325-mesh sieve to obtain the protective glaze slurry.

[0035] The amount of corundum powder added to the brightening glaze is 2% of the dry weight of the protective glaze. After passing through a 320-mesh sieve, the particle size is approximately 45 micrometers. The corundum powder is added to water and printing paste to make a corundum powder water glaze, which is then mixed with the protective glaze slurry and ball-milled to obtain the brightening glaze.

[0036] The application amount of protective glaze is 200-260g / m², and the application amount of brightening glaze is 100-130g / m². The glazing is applied by screen printing, with each application amount being 100-130g / m².

[0037] In this embodiment, the firing process is as follows: firing temperature 1185℃, firing cycle 65 minutes.

[0038] In this embodiment, after polishing, a protective wax is applied to the surface of the brick blank. The polishing process parameters are as follows: 15 sets of 1000-grit elastic abrasive blocks, 15 sets of 1500-grit elastic abrasive blocks, pressure 2 kg; 10 sets of 3000-grit elastic abrasive blocks, pressure 1 kg; 20 sets of sharp 240-grit sponge polishers, 20 sets of conventional 240-grit sponge polishers, pressure 0.5 kg. The anti-fouling protective wax used is Shuangyi low-gloss B wax, with a drip rate of 3-5 g / m².

[0039] In this embodiment, inkjet printing is used to print on the surface of the brick blank. Other known printing methods can be used by those skilled in the art, and are not limited here.

[0040] In this embodiment, after the pattern is printed on the surface of the brick blank, a colored glaze is applied to adjust the color layers of the pattern, making the pattern colors richer, more vibrant, and with a better sense of layering.

[0041] Examples 1-2

[0042] A ceramic tile with a positioning and brightening effect is provided. The production process is the same as in Example 1-1, with the following process parts adjusted: the firing regime is: firing temperature 1200℃, firing cycle 62 minutes.

[0043] Examples 1-3

[0044] A ceramic tile with a positioning brightening effect is provided. The production process is the same as in Example 1-1, with the following process parts adjusted: In this example, the chemical composition of the protective glaze, by mass percentage, is: SiO2 52.45%, Al2O3 20.28%, Fe2O3 0.43%, CaO 7.59%, MgO 3.55%, BaO 8.54%, ZnO 2.73%, K2O 3.63%, and Na2O 0.78%, with the remainder being loss on ignition.

[0045] The raw material composition of the protective glaze includes the following components by weight: 1.4 parts zinc oxide, 8.2 parts barium carbonate, 16.4 parts potassium feldspar, 26 parts 602 frit, 6.9 parts calcined talc, 1.4 parts calcium carbonate, 6.9 parts wollastonite, 24.6 parts kaolin and 8.2 parts calcined kaolin.

[0046] In the raw material composition of the brightening glaze in this embodiment, the corundum powder accounts for 2.2% of the dry weight of the protective glaze. The particle size is approximately 41 micrometers after passing through a 360-mesh sieve.

[0047] The firing process is as follows: firing temperature 1170℃, firing cycle 60 minutes.

[0048] Examples 1-4

[0049] A ceramic tile with a positioning brightening effect is provided. The production process is the same as in Example 1-1, with the following process parts adjusted: In this example, the chemical composition of the protective glaze, by mass percentage, is: SiO2 49.4%, Al2O3 14.6%, Fe2O3 0.1%, CaO 5.4%, MgO 1.8%, BaO 8.3%, ZnO 4.3%, K2O 4%, Na2O 1.7%, ZrO2 10.3%, and TiO2 0.1%.

[0050] The raw material composition of the protective glaze includes the following components by weight: 4 parts zinc oxide, 10 parts barium carbonate, 26 parts potassium feldspar, 14 parts sodium feldspar, 10 parts aluminum oxide, 5 parts talc, 8 parts calcite, 8 parts kaolin, and 15 parts zirconium silicate.

[0051] In the raw material composition of the brightening glaze in this embodiment, the corundum powder accounts for 2.5% of the dry material weight of the protective glaze. The particle size is approximately 38 micrometers after passing through a 400-mesh sieve.

[0052] The firing process is as follows: firing temperature 1235℃, firing cycle 60 minutes.

[0053] Comparative Example 1-1

[0054] A ceramic tile with a positioning brightening effect is provided. The production process is the same as in Examples 1-2, with the following process parts adjusted: In the raw material composition of the brightening glaze in this example, the mass of corundum powder is 1% of the mass of the dry protective glaze.

[0055] Comparative Examples 1-2

[0056] A ceramic tile with a positioning brightening effect is provided. The production process is the same as in Examples 1-2, with the following process parts adjusted: In the raw material composition of the brightening glaze in this example, the mass of corundum powder is 5% of the mass of the dry protective glaze.

[0057] Comparative Examples 1-3

[0058] A ceramic tile with a positioning brightening effect is provided. The production process is the same as in Examples 1-2, with the following process parts adjusted: In the raw material composition of the brightening glaze in this example, the corundum powder passes through a 500-mesh sieve and has a particle size of about 30 micrometers.

[0059] Comparative Examples 1-4

[0060] A ceramic tile with a positioning brightening effect is provided. The production process is the same as in Examples 1-2, with the following process parts adjusted: In the raw material composition of the brightening glaze in this example, the corundum powder passes through a 250-mesh sieve and has a particle size of about 60 micrometers.

[0061] The test data is shown in the table below:

[0062]

[0063] From the effect data of Examples 1-1 to 1-4, and the comparison between Example 1-1 and Comparative Examples 1-1 to 1-4, it can be seen that when different compositions of glaze are used as protective glazes, and the amount of corundum powder added is 2-2.5% of the dry weight of the protective glaze, and the particle size of the corundum powder is 38-45 micrometers, the brightening glaze applied at fixed points forms protrusions at the particle points after firing. After polishing and smoothing, a clear bright surface is formed, creating a significant brightness difference of more than 15° with other parts of the brick surface, which is very aesthetically pleasing. Experimental tests show that the gloss is concentrated between 15-27°, and the wear resistance is significantly improved, reaching level 3 (1500 revolutions or more) and even level 4 (2100 revolutions), which can meet the needs of most daily use scenarios.

[0064] Compared to Examples 1-2, in this invention, if the dry material mass or corundum powder particle size is too large, such as in Comparative Examples 1-2 and 1-4, it is difficult to achieve complete firing during the protective glaze firing process. This results in a rough, granular feel in the pre-defined areas where the granules are brightened, which is difficult to eliminate even after polishing. The flatness and stain resistance are significantly worse, and the transparency of the brick surface decreases. The gloss and brightness difference of the granules are significantly reduced, and the brightness difference of the waterproof terrazzo is generally poor or even poor.

[0065] Compared to Examples 1-2, if the dry mass of corundum powder or the particle size of corundum powder is too small, such as in Comparative Examples 1-1 and 1-3, it is easy to sinter, resulting in a small difference between the brightening area applied at a fixed point and other parts of the brick surface, thus failing to achieve the brightening effect. As can be seen from the data, the wear resistance also decreases. Furthermore, since Comparative Example 1-1 added relatively little corundum powder, it did not increase the firing temperature, resulting in poor fusion after firing, similar to the low-temperature glaze of terrazzo in the prior art.

[0066] Comparative Example 2-1

[0067] A terrazzo is provided, which uses cement binder and crushed stone, glass, quartz stone, etc. as surface particles, and is prepared using a known terrazzo process to the same specifications as the ceramic tiles in Example 1-1.

[0068] Comparative Example 2-2

[0069] This invention provides a terrazzo-like ceramic tile, the preparation process of which is the same as in Examples 1-1, except that the surface of the tile is printed with a conventional protective glaze, and more fluxing substances are added to the protective glaze at the particle points. The firing regime is as follows: firing temperature 1165℃, firing cycle 45min.

[0070] In this embodiment, the chemical composition of the protective glaze on the brick surface, by mass percentage, is: SiO2 46.8%, Al2O3 20.5%, Fe2O3 0.2%, CaO 7.3%, MgO 3.2%, BaO 7.6%, ZnO 2.5%, K2O 2.7%, Na2O 3.3%, and ZrO 20.9%, with the remainder being loss on ignition.

[0071] The raw material composition of the protective glaze on the brick surface includes the following components by weight: 40 parts feldspar, 18 parts calcined kaolin, 10 parts quartz, 14 parts dolomite, 8 parts calcined talc, 6 parts barium carbonate, and 4 parts zinc oxide.

[0072] The chemical composition of the protective glaze at the particle points, by mass percentage, is: SiO2 49.5%, Al2O3 19.9%, Fe2O3 0.2%, CaO 6.5%, MgO 2.1%, BaO 6.9%, ZnO 5.1%, K2O 3.1%, Na2O 1.9%, and ZrO2 0.6%, with the remainder being loss on ignition.

[0073] The raw material composition of the protective glaze at the particle points includes the following components by weight: 40 parts feldspar, 15 parts calcined kaolin, 8 parts quartz, 13 parts dolomite, 8 parts calcined talc, 6 parts barium carbonate, and 10 parts calcined zinc oxide.

[0074] Comparative Examples 2-3

[0075] A ceramic tile with a targeted brightening effect is provided. The production process is the same as in Example 1-1, with the following process parts adjusted:

[0076] In this embodiment, the chemical composition of the protective glaze, by mass percentage, is: SiO2 49.9%, Al2O3 19.9%, Fe2O3 0.2%, CaO 9.1%, MgO 0.6%, BaO 1.4%, ZnO 6.6%, K2O 5.6%, Na2O 3.7%, and ZrO2 1.1%, with the remainder being loss on ignition.

[0077] The raw material composition of the protective glaze includes the following components by weight: 6.5 parts alumina, 6 parts zinc oxide, 14 parts limestone, 1.5 parts calcined talc, 1 part titanium dioxide, 1.5 parts zirconium silicate, 1.5 parts barium carbonate, 4 parts Suzhou clay, 38 parts potassium feldspar, and 26 parts sodium feldspar.

[0078] The firing process is as follows: firing temperature 1135℃, firing cycle 40 minutes.

[0079] Comparative Examples 2-4

[0080] A ceramic tile with a positioning and brightening effect is provided. The production process is the same as in Example 1-1, but the following process is adjusted: the corundum powder in the raw materials is replaced with amorphous alumina powder.

[0081] The test data is shown in the table below:

[0082]

[0083] By comparing the effects of Example 1-1 with the above Comparative Examples 2-1 to 2-4, it can be seen that Example 2-1 is significantly inferior to the terrazzo-like ceramic tiles in Examples 1-1 and 2-2 in terms of wear resistance and stain absorption. Meanwhile, as seen in Comparative Example 2-2, the existing technology, by adding more fluxing agents to the glaze to melt it at a lower temperature to form terrazzo-like ceramic tiles, has poor wear resistance and poor boundary fusion. Comparing Example 1-1 with Comparative Example 2-3, it can be seen that due to the excessively low firing temperature and short firing cycle, it is also impossible to achieve a brightness difference of more than 15°, and the boundary fusion deteriorates, resulting in a significant decrease in wear resistance, stain resistance, and smoothness. Comparing Example 1-1 with Comparative Example 2-4, it can be seen that when the crystalline corundum powder is replaced with amorphous alumina powder with the same chemical composition, the gloss at the particle points is significantly reduced, the brightness difference is narrowed, the terrazzo-like decorative effect is mediocre, and the stain resistance is significantly worse. Based on our comparative tests similar to those in Examples 1-1 and 2-4, the minimum gloss difference could not be achieved by replacing corundum powder with amorphous alumina powder.

[0084] Experiments have shown that the critical firing temperature of the protective glaze needs to reach at least 1150℃. Then, 2-2.5% of the dry material mass of the present invention and corundum powder with a particle size of 38-45 micrometers are added to form a brightening glaze. The protective glaze is first applied to the surface of the brick blank, and then the brightening glaze is applied at predetermined points in the preset area to form a granular decorative effect. After firing, the surface is polished. The resulting ceramic tile with a targeted brightening effect can achieve a significant brightness difference of more than 15°, which has a very good aesthetic effect. At the same time, the wear resistance is improved, which can meet the needs of most daily use.

[0085] Example 2-1

[0086] A ceramic tile with a positioning brightening effect is provided. The production process is the same as in Examples 1-2, with the following process parts adjusted: the polishing process parameters are 10 sets of 3000-grit elastic abrasive blocks, 10 sets of 5000-grit elastic abrasive blocks, and a pressure of 2 kg; 10 sets of sharp 240-grit sponge polishing blocks, 30 sets of conventional 240-grit sponge polishing blocks, and a pressure of 0.3 kg; the wax used is Shuangyi low-gloss B wax, and the dripping amount is 0.8 g / m².

[0087] Example 2-2

[0088] A ceramic tile with a positioning brightening effect is provided. The production process is the same as in Examples 1-2, with the following process parts adjusted: the polishing process parameters are: 6 sets of 3000-grit elastic abrasive blocks, 14 sets of 5000-grit elastic abrasive blocks, and a pressure of 1 kg; 15 sets of sharp 240-grit sponge polishing blocks, 25 sets of conventional 240-grit sponge polishing blocks, and a pressure of 0.6 kg; the wax used is Shuangyi low-gloss B wax, and the dripping amount is 0.8 g / m².

[0089] Example 2-3

[0090] A ceramic tile with a positioning brightening effect is provided. The production process is the same as in Examples 1-2, with the following process parts adjusted: the polishing process parameters are 3 sets of 3000-grit elastic abrasive blocks, 6 sets of 5000-grit elastic abrasive blocks, and a pressure of 0.5 kg; 6 sets of sharp 240-grit sponge polishing blocks, 15 sets of conventional 240-grit sponge polishing blocks, and a pressure of 0.3 kg; the wax used is Shuangyi low-gloss B wax, and the dripping amount is 0.8 g / m².

[0091] Examples 2-4

[0092] A ceramic tile with a positioning brightening effect is provided. The production process is the same as in Examples 1-2, with the following process parts adjusted: the polishing process parameters are adjusted to use 14 sets of 3000-grit elastic abrasive blocks, 20 sets of 5000-grit elastic abrasive blocks, and a pressure of 2 kg; 14 sets of sharp 240-grit sponge polishing blocks, 10 sets of conventional 240-grit sponge polishing blocks, and a pressure of 1 kg; the wax used is Shuangyi low-gloss B wax, and the dripping amount is 0.8 g / m².

[0093] The test data is shown in the table below:

[0094]

[0095] By comparing the effects of Examples 1-2 with those of Examples 2-1 to 2-4, it can be seen that when the polishing process parameters are: 6-10 sets of 3000-grit elastic abrasive blocks, 10-14 sets of 5000-grit elastic abrasive blocks, and a pressure of 1-2 kg; 10-15 sets of sharp 240-grit sponge polishers, and 25-30 sets of conventional 240-grit sponge polishers, with a pressure of 0.3-0.6 kg, the cutting amount of the polishing process parameters is appropriate. This can effectively remove most of the raised gloss glaze and perform a certain polishing treatment on the surface of the brick blank. This makes the height difference between the two not noticeably perceptible. While ensuring the flatness of the brick surface, it creates a more significant difference in brightness, resulting in a better terrazzo-like aesthetic effect. Furthermore, by using the preferred polishing process parameters, the amount of wax used is significantly reduced, saving costs and effectively preventing staining.

[0096] When the preferred range is exceeded, such as in Examples 2-4, if the number of polishing parameters and the pressure are set too high, it is easy to over-polish, over-cut, and expose the pores of the glaze, resulting in a decrease in the dirt absorption performance. If the polishing process parameters are too low, such as in Examples 2-3, the glaze surface is not cut enough, resulting in a more obvious difference in surface height and insufficient flatness.

[0097] Example 3-1

[0098] A ceramic tile with a positioning and brightening effect is provided. The production process is the same as in Example 2-1, with the following process parts adjusted: the firing regime is: firing temperature 1215℃, firing cycle 58 minutes.

[0099] Example 3-2

[0100] A ceramic tile with a positioning and brightening effect is provided. The production process is the same as in Example 2-1, with the following process parts adjusted: the firing regime is: firing temperature 1225℃, firing cycle 55 minutes.

[0101] Comparative Example 3-1

[0102] A ceramic tile with a positioning and brightening effect is provided. The production process is the same as in Example 2-1, with the following process parts adjusted: the firing regime is: firing temperature 1145℃, firing cycle 65 minutes.

[0103] Comparative Example 3-2

[0104] A ceramic tile with a positioning and brightening effect is provided. The production process is the same as in Example 2-1, with the following process parts adjusted: the firing regime is: firing temperature 1250℃, firing cycle 45 minutes.

[0105] The test data is shown in the table below:

[0106]

[0107] By comparing the effects of Example 2-1 with Examples 3-1 to 3-2 above, and Comparative Examples 3-1 and 3-2, it can be seen that when the firing temperature in the firing step is too low, such as in Comparative Example 3-1, the brick body is not completely sintered, the gloss of the particle points and the gloss of the brick surface are reduced, the overall brightness difference decreases, the aesthetics deteriorate, and the wear resistance, flatness and stain resistance are significantly reduced. When the firing temperature in the firing step is too high, such as in Comparative Example 3-2, the gloss of the brick surface is high, the overall brightness difference decreases, the boundary blending is significantly reduced, and the wear resistance decreases.

[0108] Experiments revealed that when the chemical composition of the protective glaze, by mass percentage, is: SiO2 42-45%, Al2O3 18-22%, Fe2O3 0-0.3%, CaO 6.5-8.0%, MgO 2.0-3.0%, BaO 8.0-9.0%, ZnO 2.0-2.5%, K2O 2.0-2.5%, Na2O 3.0-3.5%, ZrO2 0.5-1.0%, the remainder being loss on ignition; and the raw material composition of the protective glaze, by weight, includes: 30-35 parts potassium feldspar, 8-12 parts kaolin, 8-12 parts calcined kaolin, 6-8 parts quartz, 15-20 parts dolomite, 4-6 parts calcined talc, 4-6 parts barium carbonate, 6-8 parts calcined zinc oxide, and 6-8 parts calcined alumina. Furthermore, the firing regime is: firing temperature 1185℃-1225℃, firing cycle 55-65 minutes. The brightness difference of the imitation terrazzo tile surface is above 15°. During firing, the brightening glaze and the protective glaze on the glaze surface have good fusion.

[0109] Further optimization of the firing regime, with a firing temperature of 1200℃-1215℃ and a firing cycle of 58-62 minutes, resulted in better sintering and excellent boundary integration between the protective glaze and the brightening glaze.

[0110] 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 production process for ceramic tiles with a targeted brightening effect, characterized in that, The production process is as follows: After the brick blank is pressed into shape, a terrazzo texture pattern is printed on the surface of the brick blank. A protective glaze is applied to the surface of the brick blank, and then a brightening glaze is applied. The brightening glaze is applied at fixed points in a preset area to form a granular decorative effect. After firing, the surface is polished to obtain a ceramic brick with a fixed brightening effect. The chemical composition of the protective glaze, by mass percentage, is: SiO2 44.13%, Al2O3 21.30%, Fe2O3 0.2%, CaO 7.75%, MgO 3.09%, BaO 8.36%, ZnO 2.32%, K2O 2.33%, Na2O 3.35%, and ZrO2 0.85%, with the remainder being loss on ignition. The raw material composition of the protective glaze is as follows (dry material): by weight: 33 parts potassium feldspar, 10 parts kaolin, 10 parts calcined kaolin, 8 parts quartz, 15 parts dolomite, 5 parts calcined talc, 6 parts barium carbonate, 7 parts calcined zinc oxide, and 6 parts calcined alumina. Additionally, 60 parts printing oil, 30 parts printing paste, 8 parts water, 0.2 parts sodium tripolyphosphate, and 0.3 parts sodium carboxymethyl cellulose are added. The above raw materials are ball-milled and passed through a 325-mesh sieve to obtain the protective glaze slurry. The amount of corundum powder added to the brightening glaze is 2% of the dry mass of the protective glaze, and it is passed through a 320-mesh sieve with a particle size of 45 micrometers. After the corundum powder is added to water and printing paste to make corundum powder water glaze, it is mixed with the protective glaze slurry and then ball-milled to obtain the brightening glaze. The amount of protective glaze applied is 200-260g / m², and the amount of brightening glaze applied is 100-130g / m². The glazing is carried out by screen printing, with each application amount being 100-130g / m². The firing process is as follows: firing temperature 1200℃, firing cycle 62 minutes; After polishing, a protective wax is applied to the surface of the brick blank. The polishing process parameters are as follows: 10 sets of 3000-grit elastic abrasive blocks, 10 sets of 5000-grit elastic abrasive blocks, with a pressure of 2 kg; 10 sets of sharp 240-grit sponge polishers, 30 sets of conventional 240-grit sponge polishers, with a pressure of 0.3 kg; the protective wax is Shuangyi low-gloss B wax, with a drip rate of 0.8 g / m².

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