Antifouling curved-surface ceramic polished tile based on hot bending process and preparation method of antifouling curved-surface ceramic polished tile

Abstract

The invention discloses an antifouling curved-surface ceramic polished tile based on a hot bending process and a preparation method thereof, and belongs to the technical field of curved-surface ceramic polished tiles, the antifouling curved-surface ceramic polished tile is prepared from a ceramic tile green body and ceramic ink-jet printing ink, the ceramic tile green body is firstly prepared, then the ceramic ink-jet printing ink is printed on the surface of the ceramic tile green body, and the ceramic tile green body is prepared. And carrying out a hot bending process, a polishing process and a firing process to obtain the antifouling curved ceramic polished tile. By using the modified clay, the crystal structure of the ceramic tile is optimized, the structure of the ceramic tile is more compact, pores are reduced, so that the possibility that stains enter the ceramic tile is reduced, the stain resistance and mechanical strength are improved, and the crack risk is reduced. The crack defect can be effectively avoided by reasonably controlling the heating temperature, the external force applying time and the heating rate. The antifouling grade of the prepared antifouling curved-surface ceramic polished tile can reach grade 5. The appearance of the product is free of cracks, and the breaking strength can reach 60.8 Mpa.

Description

Technical Field

[0001] The present invention relates to the technical field of curved ceramic polished tiles, and particularly to a stain-proof curved ceramic polished tile based on a hot bending process and a preparation method thereof. Background Art

[0002] Curved ceramic polished tiles are a new type of wall material that can be used at curved buildings. The preparation process of curved ceramic polished tiles is generally: powder cloth laying - pressing into shape - drying treatment - high-temperature firing - polishing treatment.

[0003] Currently, there are also some curved ceramic materials prepared by a hot bending process. The ceramic hot bending process is that when the ceramic blank reaches a suitable temperature, a certain pressure or external force is applied to the blank using the shape of the mold, so that the blank gradually softens at high temperature and bends into shape according to the shape of the mold.

[0004] The ceramic hot bending process still has the following problems: The material properties of the ceramic material itself have a great influence on the hot bending process. For example, alumina ceramics, zirconia ceramics, silicon carbide ceramics, etc. may cause changes in the crystal structure inside the ceramic during the hot bending process under the action of high temperature and stress, and it is easy to produce defects such as microcracks, reducing the overall mechanical properties of the ceramic material and being prone to cracking during use. At the same time, the hot bending process also needs to formulate reasonable temperature, pressure and heating rate according to factors such as the properties of the ceramic material to avoid defects such as cracks.

[0005] Based on this, the present invention designs a stain-proof curved ceramic polished tile based on a hot bending process and a preparation method thereof to solve the above problems. Summary of the Invention

[0006] In view of the above-mentioned drawbacks existing in the prior art, the present invention provides a stain-proof curved ceramic polished tile based on a hot bending process and a preparation method thereof.

[0007] To achieve the above object, the present invention is realized through the following technical solutions:

[0008] The stain-proof curved ceramic polished tile based on a hot bending process is prepared by using a ceramic tile blank and ceramic inkjet printing ink. The ceramic tile blank includes the following raw materials in parts by mass: 75.6 - 85.3 parts of a waste-based ceramic base material, 22.4 - 31.5 parts of modified clay, 11.0 - 15.4 parts of nano-enhanced particles, and 2.5 - 4.2 parts of an additive; the modified clay includes the following raw materials in parts by mass: 12 - 22 parts of kaolin, 8 - 12 parts of montmorillonite, 1 - 3.1 parts of lanthanum chloride, 3.1 - 4.2 parts of polyaluminum chloride, and 5 - 8 parts of citric acid;

[0009] First, prepare a ceramic tile blank, then print ceramic inkjet printing ink on the surface of the ceramic tile blank, and finally obtain a stain-resistant curved ceramic polished tile after hot bending, polishing, and firing processes;

[0010] Among them, the temperature curve of the hot bending process is controlled as follows:

[0011] Room temperature to 450 °C, with the heating rate controlled at 15.8 - 16.0 °C / min;

[0012] 450 - 835 °C, with the heating rate controlled at 11.5 - 12.2 °C / min;

[0013] 830 - 930 °C, with the heating rate controlled at 6.3 - 6.5 °C / min;

[0014] 930 - 1150 °C, with the heating rate controlled at 7.2 - 8.3 °C / min; An external force of 0.1*F - 0.15*F is applied in this temperature range;

[0015] 1150 - 1200 °C, with the heating rate controlled at 2.1 - 2.5 °C / min; An external force F is applied in this temperature range to bend the ceramic tile blank to the shape of the mold; where F represents the force required to bend the ceramic tile blank from a planar form to the shape of the mold at 1150 - 1200 °C.

[0016] Furthermore, the preparation method of the modified clay is as follows: Prepare a citric acid solution with a mass concentration of 3 - 5.5%; Preheat kaolin and montmorillonite at 50 - 70 °C for 10 - 15 min, then put them into the citric acid solution and perform microwave treatment for 15 - 22 min, with the microwave power controlled at 300 - 400 W; Then mix lanthanum chloride, kaolin, and montmorillonite and add 2 - 3 times the volume of water, stir under microwave conditions for 1 - 1.2 h, with the microwave power controlled at 400 - 600 W, then adjust the pH to 8 - 8.3, wash with water, then add polyaluminum chloride, and stir and react for 1 - 1.3 h; After the obtained product is dried, grind and sieve through 100 - 200 meshes.

[0017] Furthermore, the microwave power is controlled at 300 - 600 W.

[0018] Furthermore, among them, the waste-based ceramic base material is composed of ceramic polishing waste and quartz sand mixed in a ratio of 3 - 5:1.

[0019] Furthermore, the additive is composed of calcium fluoride and titanium oxide mixed in a ratio of 1.8 - 2.2:0.1 - 0.5.

[0020] Furthermore, the nano-enhanced particles are composed of nano-silicon nitride and shellac nano-particles mixed in a ratio of 2 - 3.2:1.2 - 1.5.

[0021] Furthermore, the ceramic inkjet printing ink comprises raw materials in the following mass percentages: 15-22 parts of metal oxide pigment, 3-6 parts of polyimide micropowder, 2-4 parts of water glass, 0.2-1 part of borax, and 55-85 parts of polyol solvent.

[0022] To better achieve the object of the present invention, the present invention also provides a method for preparing a stain-resistant curved ceramic polished tile based on a thermal bending process, comprising the following steps:

[0023] I. Preparation of modified clay: Prepare a citric acid solution with a mass concentration of 3-5.5%; preheat kaolin and montmorillonite at 50-70 °C for 10-15 min, then put them into the citric acid solution and perform microwave treatment for 15-22 min, with the microwave power controlled at 300-400 W; then mix lanthanum chloride, kaolin and montmorillonite and add 2-3 times the volume of water, stir for 1-1.2 h under microwave conditions, with the microwave power controlled at 400-600 W, then adjust the pH to 8-8.3, wash with water, and then add polyaluminum chloride and stir for reaction for 1-1.3 h; after the obtained product is dried, grind and sieve through 100-200 meshes;

[0024] II. Preparation of nano-enhanced particles: Mix nano-silicon nitride and shellac nano-particles in a ratio of 2-3.2:1.2-1.5;

[0025] III. Prepare a ceramic tile blank using 75.6-85.3 parts of waste-based ceramic base material, 22.4-31.5 parts of modified clay, 11.0-15.4 parts of nano-enhanced particles, and 2.5-4.2 parts of additive;

[0026] IV. Then print the ceramic inkjet printing ink on the surface of the ceramic tile blank;

[0027] V. Perform the thermal bending process: Put the inkjet-printed ceramic tile blank on a mold for thermal bending treatment, and the temperature curve of the thermal bending treatment is controlled as follows:

[0028] Room temperature to 450 °C, with the heating rate controlled at 15.8-16.0 °C / min;

[0029] 450-835 °C, with the heating rate controlled at 11.5-12.2 °C / min;

[0030] 830-930 °C, with the heating rate controlled at 6.3-6.5 °C / min;

[0031] 930-1150 °C, with the heating rate controlled at 7.2-8.3 °C / min; an external force of 0.1*F-0.15*F is applied in this temperature range;

[0032] At 1150 - 1200 °C, the heating rate is controlled at 2.1 - 2.5 °C / min; an external force F is applied within this temperature range to thermally bend the ceramic tile blank into the shape of the mold; where F represents the force required to thermally bend the ceramic tile blank from a planar form to the shape of the mold at 1150 - 1200 °C.

[0033] After that, the ceramic tile blank obtained after thermal bending is cooled by alternating air cooling and water cooling.

[0034] VI. Then, a polishing process and a firing process are carried out to obtain a stain - resistant curved ceramic polished tile.

[0035] Furthermore, among them, the ceramic base material based on waste materials is composed of ceramic polishing waste and quartz sand mixed in a ratio of 3 - 5:1; the additive is composed of calcium fluoride and titanium oxide mixed in a ratio of 1.8 - 2.2:0.1 - 0.5.

[0036] Furthermore, the air - cooling parameters: the wind speed is 12 - 15 m / s, the air volume is 550 - 800 m 3 / h, and the time for each time is 2 - 3 min; the water - cooling parameters: the water temperature is 10 - 15 °C, the water flow rate is 5 - 7 L / min, and the time for each time is 30 - 50 s.

[0037] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention discloses a new type of wall material. The use of modified clay is beneficial to optimizing the crystal structure of the ceramic tile during the subsequent preparation of the ceramic tile blank, making the structure of the ceramic tile more dense, reducing pores, thereby reducing the possibility of stains entering the interior of the ceramic tile, being beneficial to improving the stain - resistance performance and mechanical strength, and reducing the risk of cracks.

[0038] By reasonably controlling the heating temperature, the external force application time, and the heating rate, the present invention can effectively avoid crack defects.

[0039] The stain - resistance level of the stain - resistant curved ceramic polished tile prepared by the present invention can reach level 5. The product appearance has no cracks, and the flexural strength can reach 60.8 Mpa. Specific embodiments

[0040] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0041] Example 1: In some embodiments, a method for preparing a stain - resistant curved ceramic polished tile based on a thermal bending process includes the following steps:

[0042] I. Preparation of modified clay: Weigh 12 parts of kaolin, 12 parts of montmorillonite, 1 part of lanthanum chloride, 4.2 parts of polyaluminum chloride, and 5 parts of citric acid; prepare a citric acid solution with a mass concentration of 5.5%; preheat kaolin and montmorillonite at 50 °C for 15 min, then put them into the citric acid solution and conduct microwave treatment for 15 min with the microwave power controlled at 400 W; then mix lanthanum chloride, kaolin, and montmorillonite and add 2 volumes of water, stir under microwave conditions for 1.2 h with the microwave power controlled at 400 W, then adjust the pH to 8.3, wash with water, and then add polyaluminum chloride and stir for 1 h; after drying the obtained product, grind and sieve through a 200-mesh sieve.

[0043] Citric acid can undergo a complexation reaction with metal ions in kaolin and montmorillonite. Lanthanum chloride can enhance the compactness of kaolin and montmorillonite. Polyaluminum chloride can cause agglomeration with clay particles, improving the stability of the clay. The use of modified clay is beneficial for optimizing the crystal structure of ceramic tiles during the subsequent preparation of ceramic tile bodies, making the structure of the tiles more compact, reducing pores, thereby reducing the possibility of stains entering the interior of the tiles, being conducive to improving the stain resistance and mechanical strength, and reducing the risk of cracks.

[0044] II. Mix nanosilicon nitride and shellac nanoparticles in a ratio of 2:1.5 to obtain nano-enhanced particles. The addition of shellac nanoparticles helps enhance the connection performance between nanosilicon nitride and other materials. Mix quartz sand and ceramic polishing waste in a ratio of 3:1 to obtain a waste-based ceramic matrix; mix calcium fluoride and titanium oxide in a ratio of 2.2:0.1 to obtain an additive. Mix 22 parts of metal oxide pigment, 3 parts of polyimide micropowder, 4 parts of water glass, 0.2 part of borax, and 85 parts of polyol solvent (ethylene glycol) at 45 °C to obtain ceramic inkjet printing ink.

[0045] III. Prepare a ceramic tile body using 75.6 parts of waste-based ceramic matrix, 31.5 parts of modified clay, 11.0 parts of nano-enhanced particles, and 4.2 parts of additive; the color of the ceramic tile body is white.

[0046] IV. Then print the ceramic inkjet printing ink on the surface of the ceramic tile body; the ceramic inkjet printing ink prepared using metal oxide pigment, polyimide micropowder, water glass, borax, and polyol solvent has advantages such as strong adhesion and better fusion with the ceramic tile body, being conducive to improving the density and smoothness of the ceramic.

[0047] V. Conduct a hot bending process: Put the inkjet-printed ceramic tile body on a mold for hot bending treatment, and control the temperature curve of the hot bending treatment as follows:

[0048] Room temperature ~ 450 °C, with the heating rate controlled at 15.8 °C / min.

[0049] 450 to 835 °C, with the heating rate controlled at 11.5 °C / min;

[0050] 830 to 930 °C, with the heating rate controlled at 6.3 °C / min;

[0051] 930 to 1150 °C, with the heating rate controlled at 7.2 °C / min; an external force of 0.1*F is applied at this temperature range; applying a relatively small external force at this temperature range can enable the ceramic tile blank to gradually adapt to the action of the external force, perform preliminary shape adjustment, and reduce the risk of crack defects caused by applying a larger external force subsequently;

[0052] 1150 to 1200 °C, with the heating rate controlled at 2.1 °C / min; an external force of F is applied at this temperature range to thermally bend the ceramic tile blank to the shape of the mold; where F represents the force required to thermally bend the ceramic tile blank from a planar form to the shape of the mold at 1150 to 1200 °C;

[0053] After that, the ceramic tile blank obtained after thermal bending is cooled by alternately using air cooling and water cooling;

[0054] Air cooling parameters: wind speed is 12 m / s, air volume is 800 m 3 / h, and each time is 2 min;

[0055] Water cooling parameters: water temperature is 10 °C, water flow rate is 7 L / min, and each time is 30 s.

[0056] VI. Then, a polishing process and a firing process are carried out to obtain a stain-resistant curved ceramic polished tile.

[0057] By reasonably controlling the heating temperature, the external force application time, and the heating rate, crack defects can be effectively avoided.

[0058] The stain resistance level (GB / T 3810.14 - 2016) of the stain-resistant curved ceramic polished tile is detected: Grade 4.

[0059] The product appearance has no cracks, and the flexural strength (GB / T 3810.4 - 2016): 57.9 Mpa.

[0060] Example 2: In some embodiments, a method for preparing a stain-resistant curved ceramic polished tile based on a thermal bending process includes the following steps:

[0061] I. Preparation of modified clay: Weigh 22 parts of kaolin, 8 parts of montmorillonite, 3.1 parts of lanthanum chloride, 3.1 parts of polyaluminum chloride, and 8 parts of citric acid; prepare a citric acid solution with a mass concentration of 3%; preheat kaolin and montmorillonite at 70°C for 10 min, then put them into the citric acid solution and perform microwave treatment for 22 min with the microwave power controlled at 300 W; then mix lanthanum chloride, kaolin, and montmorillonite and add 3 times the volume of water, stir for 1 h under microwave conditions with the microwave power controlled at 600 W, then adjust the pH to 8, wash with water, and then add polyaluminum chloride and stir for reaction for 1.3 h; after drying the obtained product, grind and sieve through a 100-mesh sieve.

[0062] II. Mix nano-silicon nitride and nano-shellac particles in a ratio of 3.2:1.2 to obtain nano-enhanced particles; mix quartz sand and ceramic polishing waste in a ratio of 5:1 to obtain a waste-based ceramic base material; mix calcium fluoride and titanium oxide in a ratio of 1.8:0.5 to obtain an additive. Place 15 parts of metal oxide pigment, 6 parts of polyimide micropowder, 2 parts of water glass, 1 part of borax, and 55 parts of polyol solvent (ethylene glycol) at 52°C for mixing to obtain ceramic inkjet printing ink.

[0063] III. Prepare a ceramic tile blank using 85.3 parts of the waste-based ceramic base material, 22.4 parts of modified clay, 15.4 parts of nano-enhanced particles, and 2.5 parts of additive; the color of the ceramic tile blank is white;

[0064] IV. Then print the ceramic inkjet printing ink on the surface of the ceramic tile blank;

[0065] V. Perform the hot bending process: Place the inkjet-printed ceramic tile blank on a mold for hot bending treatment, and the temperature curve of the hot bending treatment is controlled as follows:

[0066] Room temperature to 450°C, with the heating rate controlled at 16.0°C / min;

[0067] 450 to 835°C, with the heating rate controlled at 12.2°C / min;

[0068] 830 to 930°C, with the heating rate controlled at 6.5°C / min;

[0069] 930 to 1150°C, with the heating rate controlled at 8.3°C / min; start applying an external force of 0.15*F in this temperature range;

[0070] 1150 to 1200°C, with the heating rate controlled at 2.5°C / min; start applying an external force of F in this temperature range to bend the ceramic tile blank to the shape of the mold; where F represents the force required to bend the ceramic tile blank from a flat shape to the shape of the mold at 1150 to 1200°C;

[0071] After that, the ceramic tile blank obtained after hot bending is cooled by alternately using air cooling and water cooling;

[0072] Air cooling parameters: the wind speed is 15 m / s, the air volume is 550 m 3 / h, and the time for each time is 3 min;

[0073] Water cooling parameters: the water temperature is 15 °C, the water flow rate is 5 L / min, and the time for each time is 50 s.

[0074] VI. Then, a polishing process and a firing process are carried out to obtain a stain-resistant curved ceramic polished tile.

[0075] Detect the stain-resistant grade (GB / T 3810.14-2016) of the stain-resistant curved ceramic polished tile: Grade 5.

[0076] The product appearance has no cracks, and the flexural strength (GB / T 3810.4-2016): 55.3 Mpa.

[0077] Example 3: In some embodiments, a method for preparing a stain-resistant curved ceramic polished tile based on a hot bending process includes the following steps:

[0078] I. Prepare modified clay: Weigh 18 parts of kaolin, 10 parts of montmorillonite, 1.6 parts of lanthanum chloride, 3.3 parts of polyaluminum chloride, and 4 parts of citric acid; Prepare a citric acid solution with a mass concentration of 3.5%; Preheat kaolin and montmorillonite at 60 °C for 12 min, then put them into the citric acid solution and perform microwave treatment for 18 min, and control the microwave power at 350 W; Then mix lanthanum chloride, kaolin, and montmorillonite and add 2.5 times the volume of water, stir under microwave conditions for 1 h, control the microwave power at 500 W, then adjust the pH to 8.1, wash with water, and then add polyaluminum chloride and stir and react for 1.2 h; After the obtained product is dried, grind and sieve through 200 meshes.

[0079] II. Mix nano-silicon nitride and shellac nanoparticles in a ratio of 2.5:1.2 to obtain nano-enhanced particles; Mix quartz sand and ceramic polishing waste in a ratio of 4:1 to obtain a waste-based ceramic base material; Mix calcium fluoride and titanium oxide in a ratio of 2:0.3 to obtain an additive. Place 20 parts of metal oxide pigment, 3.4 parts of polyimide micropowder, 2.2 parts of water glass, 0.5 part of borax, and 65 parts of polyol solvent (ethylene glycol) at 50 °C and mix them to obtain ceramic inkjet printing ink.

[0080] III. Prepare a ceramic tile blank by using 80.5 parts of waste-based ceramic base material, 24.5 parts of modified clay, 12.3 parts of nano-enhanced particles, and 3.2 parts of additive; The color of the ceramic tile blank is white;

[0081] IV. Then, print the ceramic inkjet printing ink on the surface of the ceramic tile blank;

[0082] V. Conduct the hot bending process: Place the ceramic tile blank after inkjet printing on a mold for hot bending treatment. The temperature curve of the hot bending treatment is controlled as follows:

[0083] Room temperature to 450 °C, with the heating rate controlled at 15.9 °C / min;

[0084] 450 to 835 °C, with the heating rate controlled at 12 °C / min;

[0085] 830 to 930 °C, with the heating rate controlled at 6.4 °C / min;

[0086] 930 to 1150 °C, with the heating rate controlled at 7.5 °C / min; Apply an external force of 0.12*F at this temperature range.

[0087] 1150 to 1200 °C, with the heating rate controlled at 2.2 °C / min; Apply an external force of F at this temperature range to bend the ceramic tile blank to the shape of the mold; where F represents the force required to bend the ceramic tile blank from a flat shape to the shape of the mold at 1150 to 1200 °C.

[0088] After that, cool the ceramic tile blank obtained after hot bending, using an alternating method of air cooling and water cooling;

[0089] Air cooling parameters: Wind speed is 13 m / s, air volume is 600 m 3 / h, and each time is 2 min;

[0090] Water cooling parameters: Water temperature is 12 °C, water flow rate is 6 L / min, and each time is 35 s.

[0091] VI. Then conduct the polishing process and firing process to obtain the anti - pollution curved ceramic polished tile.

[0092] Detect the anti - pollution level (GB / T 3810.14 - 2016) of the anti - pollution curved ceramic polished tile: Grade 4.

[0093] The product appearance has no cracks, and the flexural strength (GB / T 3810.4 - 2016): 60.8 Mpa.

[0094] Comparative Example 1: Except for the following steps being different, the other steps are the same as those in Example 3:

[0095] Step V. Conduct the hot bending process: Place the ceramic tile blank after inkjet printing on a mold for hot bending treatment. The temperature control method for the hot bending treatment is: Room temperature to 1005 °C, with the heating rate controlled at 10 °C / min; Apply an external force of F to bend the ceramic tile blank to the shape of the mold.

[0096] Detection of the stain resistance level of stain-resistant curved ceramic polished tiles (GB / T 3810.14-2016): Grade 3.

[0097] There are obvious cracks on the product appearance, flexural strength (GB / T 3810.4-2016): 41.9 Mpa.

[0098] Comparative Example 2: Except for the following different steps, the remaining steps are the same as those in Example 3:

[0099] Step 1. Prepare modified clay: Weigh 18 parts of kaolin, 10 parts of montmorillonite, 1.6 parts of lanthanum chloride, 3.3 parts of polyaluminum chloride, and 4 parts of citric acid, and mix them evenly.

[0100] Detection of the stain resistance level of stain-resistant curved ceramic polished tiles (GB / T 3810.14-2016): Grade 2.

[0101] There are slight cracks on the product appearance, flexural strength (GB / T 3810.4-2016): 47.6 Mpa.

[0102] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements will not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. Anti-fouling curved ceramic polished tile based on hot bending process, characterized in that: The ceramic tile embryo and ceramic inkjet printing ink are used to prepare the ceramic tile embryo. The ceramic tile embryo includes the following raw materials in parts by weight: 75.6-85.3 parts of a ceramic base material based on waste, 22.4-31.5 parts of modified clay, 11.0-15.4 parts of nano-enhanced particles, and 2.5-4.2 parts of additives; the modified clay includes the following raw materials in parts by weight: 12-22 parts of kaolin, 8-12 parts of montmorillonite, 1-3.1 parts of lanthanum chloride, 3.1-4.2 parts of polyaluminum chloride, and 5-8 parts of citric acid; First, a ceramic tile body is prepared, and then a ceramic inkjet printing ink is printed on the surface of the ceramic tile body, and then a stain-resistant curved ceramic polished tile is obtained after a hot bending process, a polishing process and a firing process; Among them, the temperature curve control of the hot bending process is: Room temperature ~ 450℃, heating rate controlled at 15.8~16.0℃ / min; 450~835℃, heating rate controlled at 11.5~12.2℃ / min; 830~930℃, heating rate controlled at 6.3~6.5℃ / min; 930~1150℃, the heating rate is controlled at 7.2~8.3℃ / min; in this temperature range, external force of 0.1*F~0.15*F is applied; 1150~1200℃, the heating rate is controlled at 2.1~2.5℃ / min; in this temperature range, external force F begins to be applied to bend the ceramic tile body into the shape of the mold; wherein F represents the force required to bend the ceramic tile body from a flat shape to the shape of the mold at 1150~1200℃.

2. The anti-fouling curved ceramic polished tile based on hot bending technology according to claim 1 is characterized in that: The preparation method of modified clay is as follows: prepare a citric acid solution with a mass concentration of 3 to 5.5%; preheat kaolin and montmorillonite at 50 to 70°C for 10 to 15 minutes, then put them in the citric acid solution, microwave treatment for 15 to 22 minutes, then mix lanthanum chloride, kaolin and montmorillonite and add them to 2 to 3 times the volume of water, stir for 1 to 1.2 hours under microwave conditions, then adjust the pH to 8 to 8.3, wash with water, then add polyaluminum chloride, and stir the reaction for 1 to 1.3 hours; after drying the obtained product, grind and sieve 100 to 200 meshes.

3. The anti-fouling curved ceramic polished tile based on hot bending process according to claim 2 is characterized in that: The microwave power is controlled at 300-600W.

4. The anti-fouling curved ceramic polished tile based on hot bending process according to claim 3 is characterized in that: in, The waste-based ceramic base material is prepared by mixing ceramic polishing waste and quartz sand in a ratio of 3 to 5:

1.

5. The anti-fouling curved ceramic polished tile based on hot bending process according to claim 4 is characterized in that: The additive is prepared by mixing calcium fluoride and titanium oxide in a ratio of 1.8-2.2:0.1-0.

5.

6. The anti-fouling curved ceramic polished tile based on the hot bending process according to claim 5 is characterized in that: The nano-reinforced particles are prepared by mixing nano-silicon nitride and white shellac nano-particles in a ratio of 2-3.2:1.2-1.

5.

7. The anti-fouling curved ceramic polished tile based on the hot bending process according to claim 6 is characterized in that: The ceramic inkjet printing ink comprises the following raw materials in percentage by weight: 15-22 parts of metal oxide pigment, 3-6 parts of polyimide micropowder, 2-4 parts of water glass, 0.2-1 part of borax and 55-85 parts of polyol solvent.

8. A method for preparing anti-fouling curved ceramic polished tiles based on hot bending technology according to claim 7, characterized in that: The following steps are involved:

1. Preparation of modified clay: prepare a citric acid solution with a mass concentration of 3-5.5%; preheat kaolin and montmorillonite at 50-70°C for 10-15 minutes, then put them into the citric acid solution, and microwave them for 15-22 minutes, with the microwave power controlled at 300-400W; then mix lanthanum chloride, kaolin and montmorillonite and add them to 2-3 times the volume of water, stir them for 1-1.2 hours under microwave conditions, with the microwave power controlled at 400-600W, then adjust the pH to 8-8.3, wash with water, then add polyaluminium chloride, and stir for 1-1.3 hours; after drying the obtained product, grind and sieve it to 100-200 mesh; 2. Preparation of nano-reinforced particles: mixing nano-silicon nitride and white shellac nano-particles at a ratio of 2-3.2:1.2-1.5; 3. A ceramic tile body is prepared using 75.6-85.3 parts of a waste-based ceramic base material, 22.4-31.5 parts of modified clay, 11.0-15.4 parts of nano-reinforced particles, and 2.5-4.2 parts of additives; 4. Then, the ceramic inkjet printing ink is printed on the surface of the ceramic tile body; 5. Perform hot bending process: Place the ceramic tile embryo after inkjet printing on the mold for hot bending treatment. The temperature curve of the hot bending treatment is controlled as follows: Room temperature ~ 450℃, heating rate controlled at 15.8~16.0℃ / min; 450~835℃, heating rate controlled at 11.5~12.2℃ / min; 830~930℃, heating rate controlled at 6.3~6.5℃ / min; 930~1150℃, the heating rate is controlled at 7.2~8.3℃ / min; in this temperature range, external force of 0.1*F~0.15*F is applied; 1150-1200°C, the heating rate is controlled at 2.1-2.5°C / min; in this temperature range, an external force F is applied to bend the ceramic tile body to the shape of the mold; wherein F represents the force required to bend the ceramic tile body from a flat shape to the shape of the mold at 1150-1200°C; Then, the ceramic tile body obtained after hot bending is cooled by alternating air cooling and water cooling; 6. Then carry out polishing and firing processes to obtain anti-fouling curved surface ceramic polished tiles.

9. The method for preparing anti-fouling curved ceramic polished tiles based on hot bending technology according to claim 8, characterized in that: in, The waste-based ceramic base material is prepared by mixing ceramic polishing waste and quartz sand in a ratio of 3 to 5:1; the additive is prepared by mixing calcium fluoride and titanium oxide in a ratio of 1.8 to 2.2:0.1 to 0.

5.

10. The method for preparing anti-fouling curved ceramic polished tiles based on hot bending technology according to claim 9, characterized in that: Air cooling parameters: wind speed is 12-15m / s, air volume is 550-800m 3 / h, each time is 2 to 3 minutes; water cooling parameters: water temperature is 10 to 15°C, water flow rate is 5 to 7L / min, and each time is 30 to 50s.