Super white ceramic plate and its preparation process

Abstract

The application discloses a kind of super white ceramic plate, including the weight ratio of (50-60) :(2-3) :(4-5) :(24-30) base material, dispersing agent, binder and water;Wherein, the base material includes the following weight parts raw materials: magnesium oxide modified kaolin 26-30 parts, quartz powder 16-20 parts, feldspar powder 13-15 parts, high white ball clay 10-12 parts, dolomite 5-7 parts, titanium dioxide 6-8 parts, waste glass 8-10 parts.The application also provides a kind of preparation process of super white ceramic plate, steps include: weighing base material mixing, the base material is pulverized to 400-500 mesh after mixing;Base material is mixed with dispersing agent, binder and water, and the slurry of nodular preparation is prepared, after spray granulation, it is added into punch press and is punched into shape, to obtain ceramic tile body, dry after firing is obtained.The purpose of the application is to ensure the whiteness and gloss of ceramic plate, and also realize the improvement of bending strength and water absorption.

Description

Technical Field

[0001] This invention relates to the field of ultra-white ceramic panel technology, specifically to an ultra-white ceramic panel and its preparation process. Background Technology

[0002] As people's living standards improve, their demands for home decoration materials are becoming increasingly sophisticated, environmentally friendly, and health-oriented. Ceramic products, as an important component of home decoration, have seen their whiteness, translucency, and environmental performance become a focus for consumers. However, traditional white ceramic slabs suffer from high costs, low yields, and high energy consumption due to limitations in raw material selection and manufacturing processes, resulting in persistently high market prices and difficulty in meeting market demand.

[0003] In addition to the above, whiteness, flexural strength, water absorption rate, and gloss are all important indicators of terracotta panels. Ultra-white terracotta panels, through the selection of high-whiteness raw materials and refined processing techniques, achieve an extremely high whiteness on their surface, resulting in a bright and refreshing visual effect. The flexural strength of ultra-white terracotta panels is generally greater than 32 MPa. High flexural strength in ultra-white terracotta panels provides better structural stability and load-bearing capacity, enabling them to maintain stable shape and performance in various complex environments. Water absorption rate reflects the proportion of weight increase after water absorption; low water absorption rate in ultra-white terracotta panels provides better waterproof performance and durability, maintaining stable performance in humid environments. Based on this, this invention proposes an ultra-white terracotta panel and its preparation process. Summary of the Invention

[0004] The purpose of this invention is to provide an ultra-white ceramic slab and its preparation process, which, while ensuring the whiteness and gloss of the ceramic slab, also improves the bending strength and water absorption rate.

[0005] In a first aspect, the present invention provides an ultra-white ceramic slab, comprising a base material, a dispersant, a binder, and water in a weight ratio of (50-60):(2-3):(4-5):(24-30); wherein the base material comprises the following raw materials in weight parts: 26-30 parts of magnesium oxide modified kaolin, 16-20 parts of quartz powder, 13-15 parts of feldspar powder, 10-12 parts of high-whiteness kaolin, 5-7 parts of dolomite, 6-8 parts of titanium dioxide, and 8-10 parts of waste glass.

[0006] Furthermore, the preparation method of the magnesium oxide-modified kaolin includes: pretreating magnesium oxide with a silane coupling agent, and then mixing it with ethanol, sodium dihydrogen phosphate, and kaolin at a stirring speed of [missing information].

[0007] Stir at 500-600 r / min for 3-4 h, then wash, dry at 80-100℃, and calcine at 600-640℃ to obtain the final product.

[0008] Furthermore, the weight ratio of the pretreated magnesium oxide, ethanol, sodium dihydrogen phosphate and kaolin is (10-12):(80-90):(14-16):(46-50).

[0009] Furthermore, the silane coupling agent is KH550 and KH560 in a weight ratio of 1:(1-2).

[0010] Furthermore, the pretreatment step includes: mixing magnesium oxide, silane coupling agent and ethanol evenly, and drying at a temperature of 60-80℃ for 5-6 hours.

[0011] Further, the weight ratio of the magnesium oxide, silane coupling agent, and ethanol is (40-50):(10-14):

[0012] (22-26).

[0013] Furthermore, the dispersant is sodium tripolyphosphate.

[0014] Furthermore, the adhesive is ethylene glycol monovinyl polyvinyl alcohol ether with an average molecular weight of 2500-2600 and a hydroxyl value of 16-18 mgKOH / g.

[0015] Secondly, the present invention provides a preparation process for ultra-white ceramic slabs, the steps of which include: weighing and mixing base materials, crushing the mixed base materials to 400-500 mesh; mixing the base materials with dispersant, binder and water to prepare a slurry, spray granulating, adding it into a stamping press for stamping to obtain a ceramic tile blank, and drying and firing to obtain the final product.

[0016] Furthermore, the drying temperature is 200-240℃, and the drying time is 2-3 hours; the firing temperature is 1160-1200℃, and the firing time is 1-2 hours.

[0017] The beneficial effects of this invention are as follows:

[0018] This invention first uses a silane coupling agent to pretreat magnesium oxide, enhancing the interfacial bonding between magnesium oxide and kaolin, allowing the modified kaolin to function better in terracotta panels. Furthermore, the magnesium oxide modification enhances the mechanical properties and chemical stability of the kaolin, contributing to improved flexural strength of the terracotta panels. Simultaneously, the modified kaolin binds more tightly with other components in the base material, reducing porosity and thus lowering water absorption.

[0019] In this invention, the pretreatment of magnesium oxide utilizes KH550 and KH560 dual coupling agents as bridging molecules. One end reacts with the hydroxyl groups on the magnesium oxide surface, while the other end reacts with the hydroxyl groups or oxygen atoms on the kaolinite surface, thereby forming a strong chemical bond between them. This bond formation significantly enhances the interfacial bonding between magnesium oxide and kaolinite, allowing the modified kaolinite to disperse better in the terracotta panel and bond more effectively with the matrix, thus improving the overall mechanical strength of the terracotta panel, particularly its flexural strength. The introduction of the silane coupling agent may also alter the hydrophilicity of the kaolinite surface to some extent, making it more hydrophobic. This change in hydrophobicity also helps reduce the water absorption rate of the terracotta panel.

[0020] In this invention, the kaolin is first dried at 80-100℃, followed by calcination at 600-640℃. These two different temperature conditions allow the modified kaolin to undergo chemical reactions and physical changes with other raw materials, forming a denser ceramic structure. This densification reduces the porosity and defects within the ceramic slab, making it more difficult for external forces to damage the structure, thus improving its bending strength. This denser structure also reduces porosity, naturally lowering the water absorption rate of the ceramic slab. Furthermore, the drying temperature range of 80-100℃ effectively removes moisture introduced during mixing, as well as some adsorbed water from the raw materials themselves. Moisture removal is a prerequisite for the smooth progress of the subsequent calcination process, as excessive moisture will expand rapidly during calcination and may cause the ceramic slab to crack. The slight thermal effect during drying may also help promote the initial bonding between the modified magnesium oxide and kaolin, laying a good foundation for the subsequent calcination process.

[0021] This invention selects 26-30 parts of magnesium oxide-modified kaolin, 16-20 parts of quartz powder, 13-15 parts of feldspar powder, 10-12 parts of high-whiteness kaolin, 5-7 parts of dolomite, 6-8 parts of titanium dioxide, and 8-10 parts of waste glass as the base material. This not only ensures the high whiteness and gloss of the terracotta panels but also improves their overall performance through a reasonable mineral composition. In particular, the addition of waste glass not only reduces costs but also promotes densification of the terracotta panels during the firing process through its melting properties.

[0022] In this invention, ethylene glycol monovinyl polyvinyl alcohol ether is used as a binder. Its specific average molecular weight and hydroxyl value enable it to form an effective bonding network in the slurry, thereby enhancing the strength of the ceramic slab and reducing porosity and water absorption. Detailed Implementation

[0023] The technical solution of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, not all 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.

[0024] Example 1

[0025] This embodiment provides an ultra-white ceramic slab, comprising a base material, a dispersant, a binder, and water in a weight ratio of 55:2.5:4.5:27; wherein the base material comprises the following raw materials in parts by weight: 28 parts of magnesium oxide modified kaolin, 18 parts of quartz powder, 14 parts of feldspar powder, 11 parts of high-whiteness kaolin, 6 parts of dolomite, 7 parts of titanium dioxide, and 9 parts of waste glass.

[0026] The preparation method of the magnesium oxide modified kaolin includes:

[0027] (1) Mix magnesium oxide, silane coupling agent and ethanol evenly, and dry at 70℃ for 5.5h to obtain pretreated magnesium oxide.

[0028] The weight ratio of magnesium oxide, silane coupling agent, and ethanol is 45:12:23; the silane coupling agent is KH550 and KH560 with a weight ratio of 1:1.5.

[0029] (2) The pretreated magnesium oxide was mixed with ethanol, sodium dihydrogen phosphate and kaolin at a stirring speed of 550 r / min for 3.5 h. Then it was washed, dried at 90 °C and calcined at 620 °C to obtain the final product.

[0030] The weight ratio of the pretreated magnesium oxide, ethanol, sodium dihydrogen phosphate and kaolin is 11:85:15:48.

[0031] The dispersant is sodium tripolyphosphate; the binder is ethylene glycol monovinyl polyvinyl alcohol ether with an average molecular weight of 2550 and a hydroxyl value of 17 mgKOH / g.

[0032] This embodiment also provides a preparation process for ultra-white ceramic slabs, the steps of which include: weighing and mixing base materials, crushing the mixed base materials to 450 mesh; mixing the base materials with dispersant, binder and water to prepare a slurry, spray granulation, adding it into a stamping machine for stamping to obtain a ceramic tile blank, drying it at 220℃ for 2.5h, and then firing it at 1180℃ for 2.5h to obtain the final product.

[0033] Example 2

[0034] This embodiment provides an ultra-white ceramic slab, comprising a base material, a dispersant, a binder, and water in a weight ratio of 50:2:4:24; wherein the base material comprises the following raw materials in parts by weight: 26 parts of magnesium oxide modified kaolin, 16 parts of quartz powder, 13 parts of feldspar powder, 10 parts of high-whiteness kaolin, 5 parts of dolomite, 6 parts of titanium dioxide, and 8 parts of waste glass.

[0035] The preparation method of the magnesium oxide modified kaolin includes:

[0036] (1) Mix magnesium oxide, silane coupling agent and ethanol evenly, and dry at 60°C for 5 hours to obtain pretreated magnesium oxide.

[0037] The weight ratio of magnesium oxide, silane coupling agent, and ethanol is 40:10:22; the silane coupling agent is KH550 and KH560 with a weight ratio of 1:1.

[0038] (2) The pretreated magnesium oxide was mixed with ethanol, sodium dihydrogen phosphate and kaolin at a stirring speed of 500 r / min for 3 h. Then it was washed, dried at 80 °C and calcined at 600 °C to obtain the final product.

[0039] The weight ratio of the pretreated magnesium oxide, ethanol, sodium dihydrogen phosphate and kaolin is 10:80:14:46.

[0040] The dispersant is sodium tripolyphosphate; the binder is ethylene glycol monovinyl polyvinyl alcohol ether with an average molecular weight of 2500 and a hydroxyl value of 16 mgKOH / g.

[0041] This embodiment also provides a preparation process for ultra-white ceramic slabs, the steps of which include: weighing and mixing base materials, crushing the mixed base materials to 400 mesh; mixing the base materials with dispersant, binder and water to prepare slurry, spray granulation, adding it into a stamping press for stamping to obtain ceramic tile blanks, drying at 200℃ for 2 hours, and then firing at 1160℃ for 2 hours to obtain the final product.

[0042] Example 3

[0043] This embodiment provides an ultra-white ceramic slab, comprising a base material, a dispersant, a binder, and water in a weight ratio of 60:3:5:30; wherein the base material comprises the following raw materials in parts by weight: 30 parts of magnesium oxide modified kaolin, 20 parts of quartz powder, 15 parts of feldspar powder, 12 parts of high-whiteness kaolin, 7 parts of dolomite, 8 parts of titanium dioxide, and 10 parts of waste glass.

[0044] The preparation method of the magnesium oxide modified kaolin includes:

[0045] (1) Mix magnesium oxide, silane coupling agent and ethanol evenly, and dry at 80℃ for 6 hours to obtain pretreated magnesium oxide.

[0046] The weight ratio of magnesium oxide, silane coupling agent, and ethanol is 50:14:26; the silane coupling agent is KH550 and KH560 with a weight ratio of 1:2.

[0047] (2) The pretreated magnesium oxide was mixed with ethanol, sodium dihydrogen phosphate and kaolin at a stirring speed of 600 r / min for 4 h. Then it was washed, dried at 100 °C and calcined at 640 °C to obtain the final product.

[0048] The weight ratio of the pretreated magnesium oxide, ethanol, sodium dihydrogen phosphate and kaolin is 12:90:16:50.

[0049] The dispersant is sodium tripolyphosphate; the binder is ethylene glycol monovinyl polyvinyl alcohol ether with an average molecular weight of 2600 and a hydroxyl value of 18 mgKOH / g.

[0050] This embodiment also provides a preparation process for ultra-white ceramic slabs, the steps of which include: weighing and mixing base materials, crushing the mixed base materials to 500 mesh; mixing the base materials with dispersant, binder and water to prepare slurry, spray granulation, adding it into a stamping press for stamping to obtain ceramic tile blanks, drying at 240℃ for 3 hours, and then firing at 1200℃ for 3 hours to obtain the final product.

[0051] Example 4

[0052] This embodiment provides an ultra-white ceramic slab, comprising a base material, a dispersant, a binder, and water in a weight ratio of 50:3:4:30; wherein the base material comprises the following raw materials in parts by weight: 26 parts of magnesium oxide modified kaolin, 20 parts of quartz powder, 13 parts of feldspar powder, 12 parts of high-whiteness kaolin, 5 parts of dolomite, 8 parts of titanium dioxide, and 8 parts of waste glass.

[0053] The preparation method of the magnesium oxide modified kaolin includes:

[0054] (1) Mix magnesium oxide, silane coupling agent and ethanol evenly, and dry at 60°C for 6 hours to obtain pretreated magnesium oxide.

[0055] The weight ratio of magnesium oxide, silane coupling agent, and ethanol is 40:14:22; the silane coupling agent is KH550 and KH560 with a weight ratio of 1:1.

[0056] (2) The pretreated magnesium oxide was mixed with ethanol, sodium dihydrogen phosphate and kaolin at a stirring speed of 600 r / min for 3 h. Then it was washed, dried at 100 °C and calcined at 600 °C to obtain the final product.

[0057] The weight ratio of the pretreated magnesium oxide, ethanol, sodium dihydrogen phosphate and kaolin is 12:80:16:46.

[0058] The dispersant is sodium tripolyphosphate; the binder is ethylene glycol monovinyl polyvinyl alcohol ether with an average molecular weight of 2500 and a hydroxyl value of 18 mg KOH / g.

[0059] This embodiment also provides a preparation process for ultra-white ceramic slabs, the steps of which include: weighing and mixing base materials, crushing the mixed base materials to 400 mesh; mixing the base materials with dispersant, binder and water to prepare a slurry, spray granulating, adding it into a stamping press for stamping to obtain a ceramic tile blank, drying it at 240℃ for 2 hours, and then firing it at 1200℃ for 2 hours to obtain the final product.

[0060] Comparative Example 1

[0061] This comparative example provides an ultra-white ceramic slab, comprising a base material, a dispersant, a binder, and water in a weight ratio of 55:2.5:4.5:27; wherein the base material comprises the following raw materials in parts by weight: 28 parts of magnesium oxide modified kaolin, 18 parts of quartz powder, 14 parts of feldspar powder, 11 parts of high-whiteness kaolin, 6 parts of dolomite, 7 parts of titanium dioxide, and 9 parts of waste glass.

[0062] The preparation method of the magnesium oxide modified kaolin includes:

[0063] (1) Mix magnesium oxide, silane coupling agent and ethanol evenly, and dry at 70℃ for 5.5h to obtain pretreated magnesium oxide.

[0064] The weight ratio of magnesium oxide, silane coupling agent, and ethanol is 45:12:23; the silane coupling agent is KH550.

[0065] (2) The pretreated magnesium oxide was mixed with ethanol, sodium dihydrogen phosphate and kaolin at a stirring speed of 550 r / min for 3.5 h. Then it was washed, dried at 90 °C and calcined at 620 °C to obtain the final product.

[0066] The weight ratio of the pretreated magnesium oxide, ethanol, sodium dihydrogen phosphate and kaolin is 11:85:15:48.

[0067] The dispersant is sodium tripolyphosphate; the binder is ethylene glycol monovinyl polyvinyl alcohol ether with an average molecular weight of 2550 and a hydroxyl value of 17 mgKOH / g.

[0068] This comparative example also provides a preparation process for ultra-white ceramic slabs, the steps of which include: weighing and mixing base materials, crushing the mixed base materials to 450 mesh; mixing the base materials with dispersant, binder and water to prepare a slurry, spray granulation, adding it into a stamping press for stamping to obtain a ceramic tile body, drying it at 220℃ for 2.5h, and then firing it at 1180℃ for 2.5h to obtain the final product.

[0069] Comparative Example 2

[0070] This comparative example provides an ultra-white ceramic slab, comprising a base material, a dispersant, a binder, and water in a weight ratio of 55:2.5:4.5:27; wherein the base material comprises the following raw materials in parts by weight: 28 parts of magnesium oxide modified kaolin, 18 parts of quartz powder, 14 parts of feldspar powder, 11 parts of high-whiteness kaolin, 6 parts of dolomite, 7 parts of titanium dioxide, and 9 parts of waste glass.

[0071] The preparation method of the magnesium oxide modified kaolin includes:

[0072] Magnesium oxide was mixed with ethanol, sodium dihydrogen phosphate, and kaolin at a stirring speed of 550 r / min for 3.5 h. The mixture was then washed, dried at 90 °C, and calcined at 620 °C to obtain the final product. The weight ratio of magnesium oxide, ethanol, sodium dihydrogen phosphate, and kaolin was 11:85:15:48.

[0073] The dispersant is sodium tripolyphosphate; the binder is ethylene glycol monovinyl polyvinyl alcohol ether with an average molecular weight of 2550 and a hydroxyl value of 17 mgKOH / g.

[0074] This comparative example also provides a preparation process for ultra-white ceramic slabs, the steps of which include: weighing and mixing base materials, crushing the mixed base materials to 450 mesh; mixing the base materials with dispersant, binder and water to prepare a slurry, spray granulation, adding it into a stamping press for stamping to obtain a ceramic tile body, drying it at 220℃ for 2.5h, and then firing it at 1180℃ for 2.5h to obtain the final product.

[0075] Comparative Example 3

[0076] This comparative example provides an ultra-white ceramic slab, comprising a base material, a dispersant, a binder, and water in a weight ratio of 55:2.5:4.5:27; wherein the base material comprises the following raw materials in parts by weight: 28 parts of pretreated magnesium oxide and kaolin mixture, 18 parts of quartz powder, 14 parts of feldspar powder, 11 parts of high-whiteness kaolin, 6 parts of dolomite, 7 parts of titanium dioxide, and 9 parts of waste glass.

[0077] The preparation method of the magnesium oxide modified kaolin includes:

[0078] Magnesium oxide, silane coupling agent and ethanol are mixed evenly and dried at 70℃ for 5.5h to obtain pretreated magnesium oxide.

[0079] The weight ratio of magnesium oxide, silane coupling agent, and ethanol is 45:12:23; the silane coupling agent is KH550 and KH560 with a weight ratio of 1:1.5.

[0080] The weight ratio of pretreated magnesium oxide to kaolin in the pretreated magnesium oxide and kaolin mixture is 11:48.

[0081] The dispersant is sodium tripolyphosphate; the binder is ethylene glycol monovinyl polyvinyl alcohol ether with an average molecular weight of 2550 and a hydroxyl value of 17 mgKOH / g.

[0082] This comparative example also provides a preparation process for ultra-white ceramic slabs, the steps of which include: weighing and mixing base materials, crushing the mixed base materials to 450 mesh; mixing the base materials with dispersant, binder and water to prepare a slurry, spray granulation, adding it into a stamping press for stamping to obtain a ceramic tile body, drying it at 220℃ for 2.5h, and then firing it at 1180℃ for 2.5h to obtain the final product.

[0083] Comparative Example 4

[0084] This comparative example provides an ultra-white ceramic slab, comprising a base material, a dispersant, a binder, and water in a weight ratio of 55:2.5:4.5:27; wherein the base material comprises the following raw materials in parts by weight: 28 parts kaolin, 18 parts quartz powder, 14 parts feldspar powder, 11 parts high-whiteness clay, 6 parts dolomite, 7 parts titanium dioxide, and 9 parts waste glass.

[0085] The dispersant is sodium tripolyphosphate; the binder is ethylene glycol monovinyl polyvinyl alcohol ether with an average molecular weight of 2550 and a hydroxyl value of 17 mgKOH / g.

[0086] This comparative example also provides a preparation process for ultra-white ceramic slabs, the steps of which include: weighing and mixing base materials, crushing the mixed base materials to 450 mesh; mixing the base materials with dispersant, binder and water to prepare a slurry, spray granulation, adding it into a stamping press for stamping to obtain a ceramic tile body, drying it at 220℃ for 2.5h, and then firing it at 1180℃ for 2.5h to obtain the final product.

[0087] Comparative Example 5

[0088] This comparative example provides an ultra-white ceramic slab, comprising a base material, a dispersant, a binder, and water in a weight ratio of 55:2.5:4.5:27; wherein the base material comprises the following raw materials in parts by weight: 28 parts of magnesium oxide modified kaolin, 18 parts of quartz powder, 14 parts of feldspar powder, 11 parts of high-whiteness kaolin, 6 parts of dolomite, 7 parts of titanium dioxide, and 9 parts of waste glass.

[0089] The preparation method of the magnesium oxide modified kaolin includes:

[0090] (1) Mix magnesium oxide, silane coupling agent and ethanol evenly, and dry at 70℃ for 5.5h to obtain pretreated magnesium oxide.

[0091] The weight ratio of magnesium oxide, silane coupling agent, and ethanol is 45:12:23; the silane coupling agent is KH550 and KH560 with a weight ratio of 1:1.5.

[0092] (2) The pretreated magnesium oxide was mixed with ethanol, sodium dihydrogen phosphate and kaolin at a stirring speed of 550 r / min for 3.5 h. After washing, it was calcined at 620 °C to obtain the final product.

[0093] The weight ratio of the pretreated magnesium oxide, ethanol, sodium dihydrogen phosphate and kaolin is 11:85:15:48.

[0094] The dispersant is sodium tripolyphosphate; the binder is ethylene glycol monovinyl polyvinyl alcohol ether with an average molecular weight of 2550 and a hydroxyl value of 17 mgKOH / g.

[0095] This comparative example also provides a preparation process for ultra-white ceramic slabs, the steps of which include: weighing and mixing base materials, crushing the mixed base materials to 450 mesh; mixing the base materials with dispersant, binder and water to prepare a slurry, spray granulation, adding it into a stamping press for stamping to obtain a ceramic tile body, drying it at 220℃ for 2.5h, and then firing it at 1180℃ for 2.5h to obtain the final product.

[0096] Comparative Example 6

[0097] This comparative example provides an ultra-white ceramic slab, comprising a base material, a dispersant, a binder, and water in a weight ratio of 55:2.5:4.5:27; wherein the base material comprises the following raw materials in parts by weight: 28 parts of magnesium oxide modified kaolin, 18 parts of quartz powder, 14 parts of feldspar powder, 11 parts of high-whiteness kaolin, 6 parts of dolomite, 7 parts of titanium dioxide, and 9 parts of waste glass.

[0098] The preparation method of the magnesium oxide modified kaolin includes:

[0099] (1) Mix magnesium oxide, silane coupling agent and ethanol evenly, and dry at 70℃ for 5.5h to obtain pretreated magnesium oxide.

[0100] The weight ratio of magnesium oxide, silane coupling agent, and ethanol is 45:12:23; the silane coupling agent is KH550 and KH560 with a weight ratio of 1:1.5.

[0101] (2) The pretreated magnesium oxide was mixed with ethanol, sodium dihydrogen phosphate and kaolin at a stirring speed of 550 r / min for 3.5 h. Then it was washed, dried at 90 °C and calcined at 620 °C to obtain the final product.

[0102] The weight ratio of the pretreated magnesium oxide, ethanol, sodium dihydrogen phosphate and kaolin is 11:85:15:48.

[0103] The dispersant is sodium tripolyphosphate; the binder is methyl allyl polyoxyethylene ether with a hydroxyl value of 17 mg KOH / g.

[0104] This comparative example also provides a preparation process for ultra-white ceramic slabs, the steps of which include: weighing and mixing base materials, crushing the mixed base materials to 450 mesh; mixing the base materials with dispersant, binder and water to prepare a slurry, spray granulation, adding it into a stamping press for stamping to obtain a ceramic tile body, drying it at 220℃ for 2.5h, and then firing it at 1180℃ for 2.5h to obtain the final product.

[0105] The ultra-white ceramic panels prepared in Examples 1-4 and Comparative Examples 1-6 were tested, and the results are shown in Table 1 below:

[0106] Table 1

[0107] Test Project Whiteness Bending strength (MPa) Water absorption rate (%) gloss Example 1 95 65 0.11 94 Example 2 95 63 0.12 93 Example 3 92 65 0.13 93 Example 4 94 64 0.12 91 Comparative Example 1 89 60 0.15 89 Comparative Example 2 87 56 0.17 86 Comparative Example 3 90 57 0.18 88 Comparative Example 4 83 53 0.21 84 Comparative Example 5 89 55 0.22 85 Comparative Example 6 90 54 0.20 86

[0108] Finally, it should be noted that the above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention; those skilled in the art should understand that modifications or equivalent substitutions can still be made to the present invention; and all technical solutions and improvements that do not depart from the spirit and scope of the present invention should be covered within the scope of the claims of the present invention.

Claims

1. A super white ceramic panel, characterized in that, The mixture comprises a base material, a dispersant, a binder, and water in a weight ratio of (50-60):(2-3):(4-5):(24-30); wherein the base material comprises the following raw materials in parts by weight: 26-30 parts of magnesium oxide modified kaolin, 16-20 parts of quartz powder, 13-15 parts of feldspar powder, 10-12 parts of high-whiteness kaolin, 5-7 parts of dolomite, 6-8 parts of titanium dioxide, and 8-10 parts of waste glass; The preparation method of the magnesium oxide modified kaolin includes: pretreating magnesium oxide with a silane coupling agent, then mixing it with ethanol, sodium dihydrogen phosphate and kaolin at a stirring speed of 500-600 r / min for 3-4 h, followed by washing, drying at 80-100℃, and calcining at 600-640℃ to obtain the final product; the binder is ethylene glycol monovinyl polyvinyl alcohol ether with an average molecular weight of 2500-2600 and a hydroxyl value of 16-18 mg KOH / g; The weight ratio of the pretreated magnesium oxide, ethanol, sodium dihydrogen phosphate, and kaolin is (10-12):(80-90):(14-16):(46-50); the silane coupling agent is KH550 and KH560 with a weight ratio of 1:(1-2); the pretreatment step includes: mixing magnesium oxide, silane coupling agent, and ethanol evenly, and drying at a temperature of 60-80℃ for 5-6 hours; the weight ratio of the magnesium oxide, silane coupling agent, and ethanol is (40-50):(10-14):(22-26).

2. The ultra-white ceramic slab according to claim 1, characterized in that, The dispersant is sodium tripolyphosphate.

3. The preparation process of an ultra-white ceramic panel as described in any one of claims 1-2, characterized in that, The steps include: Weigh and mix the base materials, then crush the mixed base materials to 400-500 mesh; mix the base materials with dispersant, binder and water to prepare slurry, spray granulation, then add to a stamping press for stamping to obtain ceramic tile blanks, which are then dried and fired to obtain the final product.

4. The preparation process of an ultra-white ceramic slab according to claim 3, characterized in that, The drying temperature is 200-240℃, and the drying time is 2-3 hours; the firing temperature is 1160-1200℃, and the firing time is 1-2 hours.