A wear-resistant unglazed polished porcelain tile and its preparation method

Abstract

The present invention discloses a wear-resistant unglazed polished porcelain tile and a preparation method thereof, belonging to the technical field of unglazed polished porcelain tiles, including a brick layer and a reinforced wear-resistant layer coated on the surface of the brick layer. The bottom blank is prepared by recycling ceramic micro-powder, sintered fly ash, nano Lu 2 O 3 , hydroxyapatite, and calcium magnesium silicon composite material. The shellac resin is modified by using hollow glass microspheres with a diameter of 100-200 μm and polyphosphoric acid. Then, a reinforced wear-resistant composite material is prepared by using the modified shellac resin, hollow glass microspheres with a diameter of 400-500 μm, 2-acrylamido-2-methylpropanesulfonic acid, carboxymethyl cellulose, and 120 parts of solvent. After the bottom blank is sintered and cooled, the reinforced wear-resistant composite material is coated on the surface to obtain an unglazed polished porcelain tile with a polished surface layer. The prepared unglazed polished porcelain tile has a high surface hardness, good wear resistance, is not easy to fall off, has good stain resistance, high thermal shock resistance, and high tile strength.

Description

Technical Field

[0001] The present invention relates to the technical field of unglazed polished porcelain tiles, and particularly relates to a wear-resistant unglazed polished porcelain tile and a preparation method thereof. Background Art

[0002] A polished porcelain tile is a kind of bright tile obtained by polishing and grinding the surface of a through-body brick blank. It has advantages such as a smooth surface, stain resistance, and good visual effects.

[0003] CN118373694A discloses a production method of a ceramic polished tile and the ceramic polished tile produced thereby, including the following steps: adding a foaming agent, a water reducing agent, and a body strengthening agent during wet grinding to obtain a body slurry; sieving the slurry obtained by wet grinding, spray-drying the sieved slurry to obtain a powder, and storing the powder in a warehouse for aging; putting the aged powder into a mold to press a body, and then drying the body through a drying oven; sending the dried body into a kiln for firing and shaping to obtain a semi-finished product; taking out the fired semi-finished product, polishing and grinding the semi-finished product after it cools to make the surface of the semi-finished product smooth, then spraying an antifouling liquid on the surface of the semi-finished product, and repeatedly grinding at least twice, and then obtaining the finished ceramic polished tile through heat treatment.

[0004] However, it has the following problems: The antifouling liquid only has an antifouling effect, and after being worn for a period of time, it is easy to fall off from the surface, resulting in the loss of the protection effect on the brick.

[0005] Based on this, the present invention designs a wear-resistant unglazed polished porcelain tile and a preparation method thereof to solve the above problems. Summary of the Invention

[0006] In view of the above-mentioned drawbacks of the prior art, the present invention provides a wear-resistant unglazed polished porcelain tile and a preparation method thereof.

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

[0008] A wear-resistant unglazed polished porcelain tile includes a brick layer and a reinforced wear-resistant layer coated on the surface of the brick layer. The brick layer includes the following raw materials in parts by weight: 75 - 105 parts of recycled ceramic micro-powder, 14 - 18 parts of sintered fly ash, 1.6 - 4.0 parts of nano Lu 2 O 3 1.6, 5 - 11 parts of hydroxyapatite, and 12 - 27 parts of calcium magnesium silicon composite material;

[0009] The reinforced wear-resistant layer includes the following raw materials in parts by weight: 14 - 21 parts of shellac resin, 4 - 7 parts of hollow glass microspheres, 18 - 25 parts of 2-acrylamido-2-methylpropanesulfonic acid (AMPS), 4 - 10 parts of carboxymethyl cellulose, and 14 - 21 parts of polyphosphoric acid (PPA).

[0010] Further, the calcium-magnesium-silicon composite material is prepared by high-temperature melting and spinning of calcite powder, silica powder, and magnesite, and its composition is: 15-18% CaO, 15-20% MgO, and the balance is SiO 2 .

[0011] Further, the sintered fly ash is obtained by calcining fly ash at 330-400 °C and then grinding.

[0012] Further, the particle size of the hollow glass microspheres is 100-500 μm, and the ball breakage rate is less than 10%.

[0013] Further, the hollow glass microspheres include the following two particle sizes: 100-200 μm, 32-48%; 400-500 μm, the balance.

[0014] Further, the weight ratio of the shellac resin to polyphosphoric acid (PPA) is controlled at 1:1.

[0015] A method for preparing the wear-resistant unglazed polished porcelain tile as described above includes the following steps:

[0016] I. Preparing the brick layer

[0017] Mix 75-105 parts of recycled ceramic micro-powder, 14-18 parts of sintered fly ash, 1.6-4.0 parts of nano Lu 2 O 3 1.6, 5-11 parts of hydroxyapatite, and 12-27 parts of calcium-magnesium-silicon composite material, press to obtain a bottom blank, and cool after sintering;

[0018] II. Preparing the enhanced wear-resistant composite material

[0019] Add hollow glass microspheres with a particle size of 100-200 μm and shellac resin to polyphosphoric acid (PPA), place them at 75-81 °C for modification reaction for 1-3 h to obtain modified shellac resin; then mix the modified shellac resin, hollow glass microspheres with a particle size of 400-500 μm, 18-25 parts of 2-acrylamido-2-methylpropanesulfonic acid (AMPS), 4-10 parts of carboxymethyl cellulose with 90-130 parts of solvent, and place them at 105-110 °C for stirring reaction for 1.3-2 h to obtain the enhanced wear-resistant composite material;

[0020] III. Coat the enhanced wear-resistant composite material on the surface of the brick layer and dry it to obtain an unglazed polished porcelain tile with a polished surface layer.

[0021] Further, the drying temperature is 60-75 °C.

[0022] Further, the sintering includes the following steps: sintering at 500 - 600 °C for 10 - 25 min, then sintering at 900 - 1000 °C for 30 - 50 min, and finally sintering at 1300 - 1400 °C for 1.5 - 2.5 h.

[0023] Further, after sintering and cooling, it is polished, and the wear-resistant composite material is coated on the surface of the brick layer.

[0024] To better achieve the object of the present invention, the present invention also provides a wear-resistant unglazed polished porcelain tile and its preparation method.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention prepares the bottom blank by recycling ceramic micro-powder, sintered fly ash, nano Lu 2 O 3 , hydroxyapatite, and calcium magnesium silicon composite material. The shellac resin is modified by 100 - 200 μm hollow glass microspheres and polyphosphoric acid (PPA). Then, a wear-resistant composite material is prepared by using the modified shellac resin, 400 - 500 μm hollow glass microspheres, 2-acrylamido-2-methylpropanesulfonic acid (AMPS), carboxymethyl cellulose, and 120 parts of solvent (water). After the bottom blank is sintered and cooled, it is polished, and then the wear-resistant composite material is coated on the surface to obtain an unglazed polished porcelain tile with a polished surface layer. The prepared unglazed polished porcelain tile has a high surface hardness, good wear resistance, is not easy to fall off, has good stain resistance, high thermal shock resistance, and high tile strength. Specific Embodiments

[0026] 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 them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0027] Example 1: In some embodiments, a wear-resistant unglazed polished porcelain tile includes a brick layer and a wear-resistant composite layer coated on the surface of the brick layer. The brick layer includes the following raw materials in parts by weight: 75 parts of recycled ceramic micro-powder, 14 parts of sintered fly ash, nano Lu 2 O 3 1.6 parts, 5 parts of hydroxyapatite, and 12 parts of calcium magnesium silicon composite material; the calcium magnesium silicon composite material is prepared by high-temperature melting and spinning of calcite powder, silica powder, and magnesite, and its components are: 15% CaO, 15% MgO, and the balance SiO 2; The sintered fly ash is obtained by calcining fly ash at 330°C and then grinding it; the enhanced wear-resistant layer comprises raw materials in the following parts by weight: 14 parts of shellac resin, 4 parts of hollow glass microspheres, 18 parts of 2-acrylamido-2-methylpropanesulfonic acid (AMPS), 4 parts of carboxymethyl cellulose, and 14 parts of polyphosphoric acid (PPA); the breakage rate of the hollow glass microspheres is less than 10%. The hollow glass microspheres include the following two particle sizes: 100 - 200 μm accounting for 32%; 400 - 500 μm for the balance.

[0028] The preparation method of the wear-resistant unglazed polished porcelain tile comprises the following steps:

[0029] I. Preparing the brick layer: Mixing recycled ceramic micro-powder, sintered fly ash, nano Lu 2 O 3 , hydroxyapatite, and calcium magnesium silicon composite material, pressing to obtain a bottom blank, then sintering at 500°C for 10 min, then sintering at 900°C for 30 min, and finally sintering at 1300°C for 1.5 h; cooling and then polishing;

[0030] II. Preparing the enhanced wear-resistant composite material: Adding hollow glass microspheres with a particle size of 100 - 200 μm and shellac resin into polyphosphoric acid (PPA), carrying out a modification reaction at 75°C for 1 h to obtain modified shellac resin; then mixing the modified shellac resin, hollow glass microspheres with a particle size of 400 - 500 μm, 2-acrylamido-2-methylpropanesulfonic acid (AMPS), carboxymethyl cellulose with 90 parts of solvent (water), and carrying out a stirring reaction at 105°C for 1.3 h to obtain the enhanced wear-resistant composite material;

[0031] III. Coating the enhanced wear-resistant composite material on the surface of the brick layer and drying it at 60°C to obtain an unglazed polished porcelain tile with a polished surface layer, and the thickness of the enhanced wear-resistant layer is about 0.5 mm.

[0032] Example 2: In some embodiments, a wear-resistant unglazed polished porcelain tile comprises a brick layer and an enhanced wear-resistant layer coated on the surface of the brick layer. The brick layer comprises raw materials in the following parts by weight: 105 parts of recycled ceramic micro-powder, 18 parts of sintered fly ash, nano Lu 2 O 3 4.0 parts, 11 parts of hydroxyapatite, and 27 parts of calcium magnesium silicon composite material; the calcium magnesium silicon composite material is prepared by high-temperature melting and spinning of calcite powder, silica powder, and magnesite, and its composition is: 18% CaO, 20% MgO, and the balance SiO 2; The sintered fly ash is obtained by calcining fly ash at 400°C and then grinding it; the enhanced wear-resistant layer comprises raw materials in the following parts by weight: 21 parts of shellac resin, 7 parts of hollow glass microspheres, 25 parts of 2-acrylamido-2-methylpropanesulfonic acid (AMPS), 10 parts of carboxymethyl cellulose, and 21 parts of polyphosphoric acid (PPA); the breakage rate of the hollow glass microspheres is less than 10%. The hollow glass microspheres include the following two particle sizes: 100-200 μm accounting for 48%; 400-500 μm for the balance.

[0033] The preparation method of the wear-resistant unglazed polished porcelain tile comprises the following steps:

[0034] I. Preparing the brick layer: Mixing recycled ceramic micro-powder, sintered fly ash, nano Lu 2 O 3 , hydroxyapatite, and calcium magnesium silicon composite material, pressing to obtain a bottom blank, then sintering at 600°C for 25 min, then sintering at 1000°C for 50 min, and finally sintering at 1400°C for 2.5 h; polishing after cooling;

[0035] II. Preparing the enhanced wear-resistant composite material: Adding hollow glass microspheres with a particle size of 100-200 μm and shellac resin into polyphosphoric acid (PPA), and carrying out a modification reaction at 81°C for 3 h to obtain modified shellac resin; then mixing the modified shellac resin, hollow glass microspheres with a particle size of 400-500 μm, 2-acrylamido-2-methylpropanesulfonic acid (AMPS), carboxymethyl cellulose with 130 parts of solvent (water), and carrying out a stirring reaction at 110°C for 2 h to obtain the enhanced wear-resistant composite material;

[0036] III. Coating the enhanced wear-resistant composite material on the surface of the brick layer and drying at 75°C to obtain an unglazed polished porcelain tile with a polished surface layer, and the thickness of the enhanced wear-resistant layer is about 0.5 mm.

[0037] Example 3: In some embodiments, a wear-resistant unglazed polished porcelain tile comprises a brick layer and an enhanced wear-resistant layer coated on the surface of the brick layer. The brick layer comprises raw materials in the following parts by weight: 85 parts of recycled ceramic micro-powder, 15 parts of sintered fly ash, nano Lu 2 O 3 2 parts, 7 parts of hydroxyapatite, and 15 parts of calcium magnesium silicon composite material; the calcium magnesium silicon composite material is prepared by high-temperature melting and spinning of calcite powder, silica powder, and magnesite, and its composition is: 16% CaO, 17% MgO, and the balance SiO 2; The sintered fly ash is obtained by calcining fly ash at 350°C and then grinding it; the enhanced wear-resistant layer comprises raw materials in the following parts by weight: 15 parts of shellac resin, 5 parts of hollow glass microspheres, 20 parts of 2-acrylamido-2-methylpropanesulfonic acid (AMPS), 5 parts of carboxymethyl cellulose, and 18 parts of polyphosphoric acid (PPA); the breakage rate of the hollow glass microspheres is less than 10%. The hollow glass microspheres include the following two particle sizes: 38% of 100 - 200 μm; the balance of 400 - 500 μm.

[0038] The preparation method of the wear-resistant unglazed polished porcelain tile comprises the following steps:

[0039] I. Preparing the brick layer: Mixing recycled ceramic micro-powder, sintered fly ash, nano Lu 2 O 3 , hydroxyapatite, and calcium magnesium silicon composite material, pressing to obtain a bottom blank, then sintering at 530°C for 15 min, then sintering at 960°C for 35 min, and finally sintering at 1350°C for 2 h; polishing after cooling;

[0040] II. Preparing the enhanced wear-resistant composite material: Adding hollow glass microspheres of 100 - 200 μm and shellac resin into polyphosphoric acid (PPA), carrying out a modification reaction at 79°C for 2 h to obtain modified shellac resin; then mixing the modified shellac resin, hollow glass microspheres of 400 - 500 μm, 2-acrylamido-2-methylpropanesulfonic acid (AMPS), carboxymethyl cellulose with 100 parts of solvent (water), and carrying out a stirring reaction at 108°C for 1.6 h to obtain the enhanced wear-resistant composite material;

[0041] III. Coating the enhanced wear-resistant composite material on the surface of the brick layer, and drying at 65°C to obtain the unglazed polished porcelain tile with a polished surface layer, and the thickness of the enhanced wear-resistant layer is about 0.5 mm.

[0042] Example 4: In some embodiments, a wear-resistant unglazed polished porcelain tile comprises a brick layer and an enhanced wear-resistant layer coated on the surface of the brick layer. The brick layer comprises raw materials in the following parts by weight: 90 parts of recycled ceramic micro-powder, 16 parts of sintered fly ash, nano Lu 2 O 3 3 parts, 10 parts of hydroxyapatite, and 18 parts of calcium magnesium silicon composite material; the calcium magnesium silicon composite material is prepared by high-temperature melting and spinning of calcite powder, silica powder, and magnesite, and its components are: 17% CaO, 19% MgO, and the balance SiO 2; The sintered fly ash is obtained by calcining fly ash at 380°C and then grinding it; the enhanced wear-resistant layer comprises raw materials in the following parts by weight: 20 parts of shellac resin, 6 parts of hollow glass microspheres, 22 parts of 2-acrylamido-2-methylpropanesulfonic acid (AMPS), 7 parts of carboxymethyl cellulose, and 20 parts of polyphosphoric acid (PPA); the breakage rate of the hollow glass microspheres is less than 10%. The hollow glass microspheres include the following two particle sizes: 42% of 100 - 200 μm; the balance of 400 - 500 μm.

[0043] The preparation method of the wear-resistant unglazed polished porcelain tile comprises the following steps:

[0044] I. Preparing the brick layer: Mixing recycled ceramic micro-powder, sintered fly ash, nano Lu 2 O 3 , hydroxyapatite, and calcium magnesium silicon composite material, pressing to obtain a bottom blank, then sintering at 590°C for 22 min, then sintering at 970°C for 45 min, and finally sintering at 1380°C for 2.3 h; polishing after cooling;

[0045] II. Preparing the enhanced wear-resistant composite material: Adding hollow glass microspheres of 100 - 200 μm and shellac resin into polyphosphoric acid (PPA), carrying out a modification reaction at 80°C for 1.6 h to obtain a modified shellac resin; then mixing the modified shellac resin, hollow glass microspheres of 400 - 500 μm, 2-acrylamido-2-methylpropanesulfonic acid (AMPS), carboxymethyl cellulose with 112 parts of a solvent (water), and carrying out a stirring reaction at 108°C for 1.7 h to obtain the enhanced wear-resistant composite material;

[0046] III. Coating the enhanced wear-resistant composite material on the surface of the brick layer and drying at 72°C to obtain an unglazed polished porcelain tile with a polished surface layer, and the thickness of the enhanced wear-resistant layer is about 0.5 mm.

[0047] Example 5: In some embodiments, a wear-resistant unglazed polished porcelain tile includes a brick layer and an enhanced wear-resistant layer coated on the surface of the brick layer. The brick layer comprises raw materials in the following parts by weight: 101 parts of recycled ceramic micro-powder, 17 parts of sintered fly ash, nano Lu 2 O 3 3.7 parts, 10 parts of hydroxyapatite, and 26 parts of calcium magnesium silicon composite material; the calcium magnesium silicon composite material is prepared by high-temperature melting and spinning of calcite powder, silica powder, and magnesite, and its composition is: 17% CaO, 19% MgO, and the balance SiO 2; The sintered fly ash is obtained by calcining fly ash at 385°C and then grinding it; the enhanced wear-resistant layer comprises raw materials in the following parts by weight: 19 parts of shellac resin, 5 parts of hollow glass microspheres, 20 parts of 2-acrylamido-2-methylpropanesulfonic acid (AMPS), 8 parts of carboxymethyl cellulose, and 16 parts of polyphosphoric acid (PPA); the breakage rate of the hollow glass microspheres is less than 10%. The hollow glass microspheres include the following two particle sizes: 40% of 100 - 200 μm; the balance of 400 - 500 μm.

[0048] The preparation method of the wear-resistant unglazed polished porcelain tile comprises the following steps:

[0049] I. Preparing the brick layer: Mixing recycled ceramic micro-powder, sintered fly ash, nano Lu 2 O 3 , hydroxyapatite, and calcium magnesium silicon composite material, pressing to obtain a bottom blank, then sintering at 550°C for 15 min, then sintering at 920°C for 42 min, and finally sintering at 1340°C for 2 h; polishing after cooling;

[0050] II. Preparing the enhanced wear-resistant composite material: Adding hollow glass microspheres of 100 - 200 μm and shellac resin into polyphosphoric acid (PPA), carrying out a modification reaction at 77°C for 1.3 h to obtain modified shellac resin; then mixing the modified shellac resin, hollow glass microspheres of 400 - 500 μm, 2-acrylamido-2-methylpropanesulfonic acid (AMPS), carboxymethyl cellulose with 120 parts of solvent (water), and carrying out a stirring reaction at 107°C for 1.6 h to obtain the enhanced wear-resistant composite material;

[0051] III. Coating the enhanced wear-resistant composite material on the surface of the brick layer, and drying at 65°C to obtain an unglazed polished porcelain tile with a polished surface layer, and the thickness of the enhanced wear-resistant layer is about 0.5 mm.

[0052] Comparative Example 1: The difference from Example 5 is that the shellac resin is not subjected to modification treatment.

[0053] A wear-resistant unglazed polished porcelain tile, comprising a brick layer and an enhanced wear-resistant layer coated on the surface of the brick layer, wherein the brick layer comprises raw materials in the following parts by weight: 101 parts of recycled ceramic micro-powder, 17 parts of sintered fly ash, nano Lu 2 O 3 3.7 parts, 10 parts of hydroxyapatite, and 26 parts of calcium magnesium silicon composite material; the calcium magnesium silicon composite material is prepared by high-temperature melting and spinning of calcite powder, silica powder, and magnesite, and its composition is: 17% CaO, 19% MgO, and the balance SiO 2; The sintered fly ash is obtained by calcining fly ash at 385°C and then grinding it; The enhanced wear-resistant layer comprises raw materials in the following parts by weight: 19 parts of shellac resin, 5 parts of hollow glass microspheres, 20 parts of 2-acrylamido-2-methylpropanesulfonic acid (AMPS), and 8 parts of carboxymethyl cellulose; The breakage rate of the hollow glass microspheres is less than 10%. The hollow glass microspheres include the following two particle sizes: 40% of 100 - 200 μm; The balance is 400 - 500 μm.

[0054] The preparation method of the wear-resistant unglazed polished porcelain tile comprises the following steps:

[0055] I. Preparing the brick layer: Mixing recycled ceramic micro-powder, sintered fly ash, nano Lu 2 O 3 , hydroxyapatite, and calcium magnesium silicon composite material, pressing to obtain a bottom blank, then sintering at 550°C for 15 min, then sintering at 920°C for 42 min, and finally sintering at 1340°C for 2 h; After cooling, polish it;

[0056] II. Preparing the enhanced wear-resistant composite material: Mixing hollow glass microspheres of 100 - 200 μm, shellac resin, hollow glass microspheres of 400 - 500 μm, 2-acrylamido-2-methylpropanesulfonic acid (AMPS), carboxymethyl cellulose with 120 parts of solvent (water), and placing them under stirring reaction at 107°C for 1.6 h to obtain the enhanced wear-resistant composite material;

[0057] III. Coating the enhanced wear-resistant composite material on the surface of the brick layer and drying it at 65°C to obtain the unglazed polished porcelain tile with a polished surface layer, and the thickness of the enhanced wear-resistant layer is about 0.5 mm.

[0058] Comparative Example 2: The difference from Example 5 is that the hollow glass microspheres are uniformly the hollow glass microspheres with a particle size of 400 - 500 μm.

[0059] A wear-resistant unglazed polished porcelain tile, comprising a brick layer and an enhanced wear-resistant layer coated on the surface of the brick layer, wherein the brick layer comprises raw materials in the following parts by weight: 101 parts of recycled ceramic micro-powder, 17 parts of sintered fly ash, nano Lu 2 O 3 3.7 parts, 10 parts of hydroxyapatite, and 26 parts of calcium magnesium silicon composite material; The calcium magnesium silicon composite material is prepared by high-temperature melting and spinning of calcite powder, silica powder, and magnesite, and its composition is: 17% CaO, 19% MgO, and the balance is SiO 2; The sintered fly ash is obtained by calcining fly ash at 385°C and then grinding it; the enhanced wear-resistant layer comprises raw materials in the following parts by weight: 19 parts of shellac resin, 5 parts of hollow glass microspheres, 20 parts of 2-acrylamido-2-methylpropanesulfonic acid (AMPS), 8 parts of carboxymethyl cellulose, and 16 parts of polyphosphoric acid (PPA); the breakage rate of the hollow glass microspheres is less than 10%. The particle size of the hollow glass microspheres is 400-500 μm.

[0060] The preparation method of the wear-resistant unglazed polished porcelain tile comprises the following steps:

[0061] I. Preparing the brick layer: Mixing recycled ceramic micro-powder, sintered fly ash, nano Lu 2 O 3 , hydroxyapatite, and calcium magnesium silicon composite material, pressing to obtain a bottom blank, then sintering at 550°C for 15 min, then sintering at 920°C for 42 min, and finally sintering at 1340°C for 2 h; polishing after cooling;

[0062] II. Preparing the enhanced wear-resistant composite material: Adding shellac resin into polyphosphoric acid (PPA), carrying out a modification reaction at 77°C for 1.3 h to obtain modified shellac resin; then mixing the modified shellac resin, hollow glass microspheres, 2-acrylamido-2-methylpropanesulfonic acid (AMPS), carboxymethyl cellulose with 120 parts of solvent (water), and carrying out a stirring reaction at 107°C for 1.6 h to obtain the enhanced wear-resistant composite material;

[0063] III. Coating the enhanced wear-resistant composite material on the surface of the brick layer and drying at 65°C to obtain an unglazed polished porcelain tile with a polished surface layer, and the thickness of the enhanced wear-resistant layer is about 0.5 mm.

[0064] Test example

[0065] Performing performance detection (GB / T 4100-2015) on the unglazed polished porcelain tiles prepared in Examples 1-5 and Comparative Examples 1-2, and the results are shown in Table 1.

[0066] Table 1 Performance test results

[0067] Project Wear resistance Thermal shock resistance Breaking strength (>1300N) Example 1 2100 revolutions, 4 poles No cracks 4954 Example 2 2100 revolutions, 4 poles No cracks 4987 Example 3 2100 revolutions, 4 poles No cracks 5012 Comparative Example 1 1500 revolutions, 3 poles No cracks 4298 Comparative Example 2 1500 revolutions, 3 poles Slight cracks 4417

[0068] It can be seen that the unglazed polished porcelain tile of the present invention has high surface hardness, good wear resistance, is not easy to fall off, has good stain resistance, high thermal shock resistance, and high tile strength.

[0069] 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 various embodiments of the present invention.

Claims

1. A wear-resistant unglazed polished porcelain tile, characterized in that: It comprises a brick layer and a reinforced wear-resistant layer coated on the surface of the brick layer, wherein the brick layer comprises the following raw materials in parts by weight: 75-105 parts of recycled ceramic micropowder, 14-18 parts of sintered fly ash, 1.6-4.0 parts of nano Lu2O3, 5-11 parts of hydroxyapatite, and 12-27 parts of calcium magnesium silicon composite material; The enhanced wear-resistant layer comprises the following raw materials in parts by weight: 14-21 parts of shellac resin, 4-7 parts of hollow glass microspheres, 18-25 parts of 2-acrylamide-2-methylpropane sulfonic acid, 4-10 parts of carboxymethyl cellulose, and 14-21 parts of polyphosphoric acid.

2. The wear-resistant unglazed polished porcelain tile according to claim 1, characterized in that: The calcium-magnesium-silicon composite material is prepared by high-temperature melting and spinning of calcium stone powder, silica stone powder and magnesia, and has the following components: 15-18% CaO, 15-20% MgO, and the balance SiO2.

3. The wear-resistant unglazed polished porcelain tile according to claim 2, characterized in that: The sintered fly ash is obtained by calcining fly ash at 330-400° C. and then grinding it.

4. The wear-resistant unglazed polished porcelain tile according to claim 3, characterized in that: The particle size of the hollow glass microspheres is 100-500 μm, and the ball breakage rate is less than 10%.

5. The wear-resistant unglazed polished porcelain tile according to claim 4, characterized in that: The hollow glass microspheres include the following two particle sizes: 100-200 μm 32-48%; 400-500 μm remainder.

6. The wear-resistant unglazed polished porcelain tile according to claim 5, characterized in that: The weight ratio of the shellac resin to the polyphosphoric acid is controlled at 1:

1.

7. A method for preparing the wear-resistant unglazed polished porcelain tile according to claim 6, characterized in that: The following steps are involved:

1. Preparation of Brick Layer Mix 75-105 parts of recycled ceramic micropowder, 14-18 parts of sintered fly ash, 1.6-4.0 parts of nano-Lu2O3, 5-11 parts of hydroxyapatite, and 12-27 parts of calcium magnesium silicon composite material, press to obtain a base blank, and cool after sintering; 2. Preparation of reinforced wear-resistant composite materials Adding hollow glass microspheres of 100-200 μm and shellac resin into polyphosphoric acid, and subjecting the mixture to a modification reaction at 75-81° C. for 1-3 hours, a modified shellac resin is obtained; Then, the modified shellac resin, hollow glass microspheres of 400-500 μm, 18-25 parts of 2-acrylamido-2-methylpropanesulfonic acid, 4-10 parts of carboxymethyl cellulose and 90-130 parts of a solvent are mixed, and stirred at 105-110° C. for 1.3-2 hours to obtain a reinforced wear-resistant composite material; 3. Coating the reinforced wear-resistant composite material on the surface of the brick layer and drying it to obtain an unglazed polished porcelain tile with a polished surface layer.

8. The method for preparing the wear-resistant unglazed polished porcelain tile according to claim 7, characterized in that: The drying temperature is 60~75℃.

9. The method for preparing the wear-resistant unglazed polished porcelain tile according to claim 8, characterized in that: Sintering includes the following steps: Sinter at 500-600℃ for 10-25min, then sinter at 900-1000℃ for 30-50min, and finally sinter at 1300-1400℃ for 1.5-2.5h.

10. The method for preparing the wear-resistant unglazed polished porcelain tile according to claim 9, characterized in that: After sintering, cooling and polishing, the reinforced wear-resistant composite material is coated on the surface of the brick layer.