Ceramic brick with radiant cooling function and its preparation method and application

Abstract

The present invention relates to the technical field of ceramic tiles, and more particularly to a ceramic tile with a radiative cooling function, a preparation method thereof, and an application thereof. The present application discloses a ceramic tile with a radiative cooling function, comprising a green body on which a glaze layer with a radiative cooling function is provided. The ceramic tile described in the present application is prepared by a sol-gel method using diatomaceous earth-loaded mesoporous alumina. The diatomaceous earth-loaded mesoporous alumina has a multi-level porous property, which enhances the scattering effect of sunlight during the sintering process with α-alumina and effectively suppresses the problem of a decrease in sunlight reflectivity caused by structural densification during the material manufacturing process.

Description

Technical Field

[0001] The present invention relates to the technical field of ceramic tiles, and in particular to a ceramic tile with a radiation cooling function, a preparation method thereof, and an application thereof. Background Art

[0002] Approximately 10% of global electricity consumption is used for air conditioning systems in buildings each year, and this demand is expected to triple by 2050. Therefore, new technological innovations are urgently needed to reduce the pressure on the power grid and address the global warming problem caused by the high carbon emissions of cooling systems.

[0003] Radiative cooling materials can use their special microstructures to reflect more than 90% of solar radiation, minimizing solar radiation heating and radiating heat into the cold outer space (about 270°C) in the form of long-wave infrared light through the atmosphere's transparent window (8 to 13 micron wavelength range), thereby achieving the effect of building cooling. In addition to the construction field, this technology can also benefit solar cells, power plant condensers, high-performance textiles for personal thermal comfort, dew collection, and slowing glacier melting.

[0004] At present, the research on radiative cooling materials was initially mainly based on nanophotonic structures of multilayer inorganic films. However, the production technology of this structure is complex and costly, and its application is limited, especially in the field of construction. Therefore, in recent years, researchers have explored the use of alternative materials such as organic polymers, such as polymer-metal composite films, porous polymer coatings and foams, polymer-ceramic particle coatings, etc. However, organic polymers increase their solar absorption under complex environmental conditions (such as ultraviolet rays, heat, water, and environmental chemicals), thereby reducing their cooling efficiency and may even cause the material to be heated. In addition, metals used in polymer or inorganic radiative cooling structures (such as silver and aluminum) may be oxidized or sulfurized by chemicals in the air, thereby reducing their solar reflectivity.

[0005] With a typical service life of 30-50 years for building materials, environmental stability is a significant obstacle to the promising technology of radiative cooling. Although environmentally stable micro- or nano-scale ceramic particles such as silica, silicon carbide, and alumina have been shown to be suitable for radiative cooling, their mechanical strength is weak due to the lack of suitable binders, making them unsuitable for construction applications.

[0006] Currently, there is no relevant patent disclosing ceramic tiles with radiant cooling function; therefore, the present application provides a ceramic tile with radiant cooling function and a preparation method and application thereof. Summary of the Invention

[0007] The present application provides a ceramic tile with radiative cooling function, as well as its preparation method and application. Diatomaceous earth-loaded mesoporous alumina is prepared by a sol-gel method. The diatomaceous earth-loaded mesoporous alumina has a multi-level porous property. During the sintering process with α-alumina, it enhances the scattering effect of sunlight and effectively suppresses the problem of decreased solar reflectivity caused by structural densification during the material manufacturing process. In addition, the ceramic tile described in the present application has a porous silica-alumina skeleton formed in the glaze layer, which can selectively emit low-temperature infrared light while maintaining a high solar reflectivity.

[0008] The purpose of the present invention is achieved through the following technical solutions:

[0009] The first object of the present application is to provide a ceramic tile with a radiant cooling function, comprising a green body, on which a glaze layer with a radiant cooling function is provided;

[0010] The glaze for forming the glaze layer having the radiant cooling function comprises the following raw materials in parts by weight:

[0011]

[0012]

[0013] Furthermore, the diatomite-loaded mesoporous alumina is prepared by loading mesoporous alumina on diatomite through a sol-gel method;

[0014] The pore size of the mesoporous alumina in the diatomaceous earth-loaded mesoporous alumina is 4-10 nm:

[0015] Furthermore, the frit comprises the following chemical components in terms of mass percentage: SiO 2+ Al2O3=85wt%, CaO+MgO=8wt%, Na2O+K2O=5wt%;

[0016] Furthermore, the aluminum oxide is α-aluminum oxide.

[0017] The second object of the present application is to provide a method for preparing a ceramic tile with radiant cooling function, comprising the following steps:

[0018] S1. Preparation of diatomite-supported mesoporous alumina

[0019] Aluminum isopropoxide is dissolved in octanol and a nonionic surfactant is added to form solution A; diatomaceous earth is dispersed to obtain solution B;

[0020] Solution B is added to solution A, and the mixture is aged, dried, and calcined to obtain diatomite-loaded mesoporous alumina;

[0021] S2. Preparation of glaze layer with radiant cooling function

[0022] Prepare materials for a glaze layer having a radiant cooling function; mix the raw materials and then ball-mill to obtain a glaze layer having a radiant cooling function;

[0023] S3. Glazing

[0024] Applying the glaze of the glaze layer with the radiant cooling function obtained in step S2 onto the blank to obtain a rough blank;

[0025] S4. Firing

[0026] The rough blank obtained in step S3 is calcined to obtain a ceramic brick with radiant cooling function.

[0027] Furthermore, in step S1, the aging time is 48-60 hours.

[0028] Furthermore, in step S1, the calcination temperature is 600°C.

[0029] Furthermore, in step S2, ball milling is performed for 10 minutes, and the mixture is passed through a 325-mesh sieve.

[0030] Furthermore, in step S4, the calcination temperature is 1100-1200°C.

[0031] The third purpose of this application is to provide the application of ceramic tiles with radiant cooling function and apply ceramic tiles to the construction field.

[0032] The beneficial effects of the present invention are:

[0033] 1. This application uses the sol-gel method to in situ synthesize mesoporous alumina material on the surface of diatomaceous earth mineral with a multi-level pore structure, realizing a multi-level pore structure on a single material. Combined with the special electromagnetic effect of alumina, the reflectivity of the glaze layer to sunlight is improved.

[0034] 2. The ceramic tiles described in the present application have a glaze layer that forms a porous alumina structure through the controlled foaming of ultrafine silicon carbide powder at high temperature. At the same time, the glaze layer is combined with a mesoporous alumina material generated in situ on a diatomaceous earth mineral carrier, which highly imitates the complex multi-level porous microstructure of the surface of insect shells in nature, achieving efficient light scattering and near-perfect solar reflectivity.

[0035] 3. The ceramic tile described in this application has a glaze layer composed of porous alumina, which has ideal inherent electromagnetic properties suitable for passive radiative cooling applications. The effective scattering of the multi-level porous system on the glaze layer achieves the optical properties required for radiative cooling. DETAILED DESCRIPTION

[0036] As used herein, "and / or" includes the term of any and all combinations of one or more of the associated listed items. The terms used herein are only used to describe specific embodiments and are not intended to limit the invention. As used herein, the singular forms "a", "an", "an" and "the" are also intended to include the plural forms, unless the context clearly indicates otherwise. It is further understood that "including", when used in this specification, specifies the stated features, integers, steps, operations, elements and / or components, but does not preclude the existence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0037] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It is further understood that terms, such as those defined in commonly used dictionaries, are interpreted in accordance with their meanings in the context of the relevant art and are not idealized or overly formalized unless expressly defined herein.

[0038] The exemplary inventions described herein may suitably lack any one or more element limitations not specifically disclosed herein. Therefore, terms such as "comprises," "includes," "contains," and the like should be understood broadly and non-restrictively. In addition, the terminology used herein is used as a description, not a limitation, and it is unintentional to use these terminology expressions that do not include any equivalent characteristics, but only describe a portion of their characteristics, but various modifications are possible within the scope of the invention according to the rights. Therefore, although the present invention has been specifically disclosed through preferred embodiments and optional features, the modifications disclosed herein to embody the changes of the invention may be recorded by those skilled in the art, and such modifications and changes will be considered to be within the scope of the invention.

[0039] The raw material or reagent used in the embodiments of the present invention and the comparative example are all purchased from market mainstream manufacturers, and the manufacturer or concentration are not specified. They are all raw materials or reagents of the analytical grade that can be routinely obtained. As long as the desired effect can be achieved, there are no particular restrictions. The reaction, stirring and other instruments and equipment used in the present embodiment are all purchased from market main manufacturers. As long as the desired effect can be achieved, there are no particular restrictions. In the present embodiment, the specific technology or conditions are not specified. The technology or conditions described in the document in this area or the product specification are carried out.

[0040] The present application provides a ceramic tile with a radiant cooling function, comprising a green body, on which a glaze layer with a radiant cooling function is provided;

[0041] The glaze for forming the glaze layer having the radiant cooling function comprises the following raw materials in parts by weight:

[0042] 10-40 parts of diatomaceous earth loaded mesoporous alumina

[0043]

[0044] In one embodiment, the glaze for forming the glaze layer having the radiant cooling function comprises the following raw materials in parts by weight: 10 parts of diatomaceous earth-loaded mesoporous alumina,

[0045] 10 parts of aluminum oxide, 1 part of frit, 1 part of calcined zinc oxide, 1 part of barium carbonate,

[0046] 1 part dolomite, 0.01 part silicon carbide;

[0047] Alternatively, the glaze for forming the glaze layer having the radiant cooling function comprises the following raw materials in parts by weight: 40 parts of diatomaceous earth-loaded mesoporous alumina,

[0048] 30 parts of aluminum oxide, 30 parts of frit, 10 parts of calcined zinc oxide, 5 parts of barium carbonate,

[0049] 20 parts of dolomite, 3 parts of silicon carbide;

[0050] Alternatively, the glaze for forming the glaze layer having the radiant cooling function comprises the following raw materials in parts by weight: 20 parts of diatomaceous earth-loaded mesoporous alumina,

[0051] 15 parts of aluminum oxide, 20 parts of frit, 5 parts of calcined zinc oxide, 4 parts of barium carbonate,

[0052] 10 parts of dolomite, 1 part of silicon carbide;

[0053] Alternatively, the glaze for forming the glaze layer having the radiant cooling function comprises the following raw materials in parts by weight: 10-40 parts of diatomaceous earth loaded mesoporous alumina,

[0054] 10 parts of aluminum oxide, 2 parts of frit, 10 parts of calcined zinc oxide, 5 parts of barium carbonate,

[0055] 20 parts of dolomite, 3 parts of silicon carbide;

[0056] Alternatively, the glaze for forming the glaze layer having the radiant cooling function comprises the following raw materials in parts by weight: 10-40 parts of diatomaceous earth loaded mesoporous alumina,

[0057] 30 parts of aluminum oxide, 15 parts of frit, 1 part of calcined zinc oxide, 1 part of barium carbonate,

[0058] 20 parts of dolomite, 1 part of silicon carbide;

[0059] The pore size of the mesoporous alumina in the diatomite-loaded mesoporous alumina is 4-10nm. Using a sol-gel method, the mesoporous alumina is synthesized in situ on the surface of the hierarchically porous diatomite mineral. Combined with the unique electromagnetic properties of alumina, this increases the reflectivity of the glaze layer to sunlight. Its function: At high temperatures, it fuses with the alumina particles, forming a biomimetic hierarchical porous structure that enhances sunlight reflectivity.

[0060] Alumina is α-alumina. Due to its unique two-dimensional structure, Al2O3 powder has excellent light reflection ability. α-alumina is also resistant to high temperatures and has high hardness, which improves the whiteness and wear resistance of the glaze.

[0061] The frit, expressed in percentage by mass, comprises the following chemical compositions:

[0062] SiO₂ + Al₂O₃ = 85wt%, CaO + MgO = 8wt%, Na₂O + K₂O = 5wt%. The specific raw material composition can be selected from existing raw materials, as long as it meets the chemical composition requirements. Function: Lowers firing temperature, expands firing range, improves glaze surface quality, reduces glaze shrinkage, and ensures excellent glaze performance.

[0063] Calcined zinc oxide has a fluxing effect, which can reduce the expansion coefficient of the glaze and improve the thermal stability of the product. At the same time, it can increase the gloss and whiteness of the glaze and improve the elasticity of the glaze.

[0064] Barium carbonate can reduce pores and bubbles, improve translucency, expand the sintering range, and increase the thermal expansion coefficient.

[0065] Dolomite, when preparing glaze, introduces CaO and MgO simultaneously, making the glaze transparent instead of opaque. It also promotes the transformation of quartz and the formation of mullite, thus expanding the firing range.

[0066] Silicon carbide, through its controlled foaming effect at high temperatures, helps the glaze layer form a porous alumina structure after sintering.

[0067] On the other hand, the method for preparing the ceramic tile is characterized by comprising the following steps:

[0068] S1. Preparation of diatomite-supported mesoporous alumina

[0069] Aluminum isopropoxide is dissolved in octanol and a nonionic surfactant is added to form solution A; diatomaceous earth is dispersed in water 6-8 times the weight of the diatomaceous earth, and then acetonitrile 1 times the weight of the diatomaceous earth is added and dispersed to obtain solution B;

[0070] Solution B is added to solution A, aged for 48-60 hours, dried, and calcined at 600° C. to obtain diatomaceous earth-supported mesoporous alumina.

[0071] The weight ratio of aluminum isopropoxide, nonionic surfactant and diatomaceous earth is 1:1:3-4.

[0072] S2. Preparation of glaze layer with radiant cooling function

[0073] Prepare materials for a glaze layer having a radiant cooling function; mix the raw materials, ball-mill for 10 minutes, and pass the mixture through a 325-mesh sieve to obtain a glaze layer having a radiant cooling function;

[0074] S3. Glazing

[0075] Applying the glaze of the glaze layer with the radiant cooling function obtained in step S2 onto the blank to obtain a rough blank;

[0076] S4. Firing

[0077] The rough blank obtained in step S3 is calcined at 1100-1200° C. to obtain a ceramic brick with a radiation cooling function.

[0078] The ceramic bricks with radiant cooling function described in this application are further described through the following specific embodiments;

[0079] Example 1

[0080] A method for preparing ceramic tiles with radiant cooling function comprises the following steps:

[0081] S1. Dissolve 1 part aluminum isopropoxide in octanol at 60°C. Add 1 part nonionic surfactant TX-100 (a polyethylene glycol derivative that acts as a nonionic surfactant) with vigorous stirring. Continue stirring for 2 hours to form solution A.

[0082] After 3 parts of diatomaceous earth were stirred and dispersed in deionized water, an equal amount of acetonitrile was added and stirred and dispersed to obtain a mixed suspension B;

[0083] Solution B was added to Solution A, and the mixture was stirred for 1 hour. The mixture was then aged at room temperature for 48 hours and vacuum filtered to obtain the product. The product was refluxed at the boiling point of anhydrous ethanol for 24 hours and then dried at 100°C for 12 hours to obtain a surfactant-free diatomaceous earth-supported mesoporous alumina precursor.

[0084] The precursor is placed in a tube furnace and calcined at a constant temperature of 600° C. for 3 hours in an air atmosphere to obtain diatomaceous earth-supported mesoporous alumina.

[0085] S2 green body using conventional ceramic green body raw materials pressed, dried and set aside;

[0086] S3. Preparation of glaze with radiant cooling function:

[0087] The glaze comprises the following raw materials, calculated by mass percentage: 30 parts of diatomaceous earth-loaded mesoporous alumina prepared in step S1, 20 parts of α-alumina, 20 parts of high-temperature frit, 3 parts of calcined zinc oxide, 6 parts of barium carbonate, 10 parts of dolomite, 0.1 parts of silicon carbide powder, 6 parts of printing paste, and 1 part of printing ink. The raw materials are mixed, 20% by weight of water is added, and the mixture is ball-milled for 10 minutes. The mixture is then passed through a 325-mesh sieve and evenly applied to the green body obtained in step S3.

[0088] S4. The green body obtained in step S3 is calcined in a kiln at a high temperature of 1130°C for 40 minutes. After calcination, the green body is cooled to room temperature to obtain a radiant cooling ceramic tile.

[0089] Example 2

[0090] The method for preparing the ceramic brick with radiant cooling function comprises the following steps:

[0091] S1. Dissolve 1 part aluminum isopropoxide in octanol at 60°C. Add 1 part nonionic surfactant TX-100 (a polyethylene glycol derivative that acts as a nonionic surfactant) with vigorous stirring. Continue stirring for 2 hours to form solution A.

[0092] After 4 parts of diatomaceous earth were stirred and dispersed in deionized water, an equal amount of acetonitrile was added and stirred and dispersed to obtain a mixed suspension B;

[0093] Solution B was added to Solution A, and the mixture was stirred for 1 hour. The mixture was then aged at room temperature for 60 hours and vacuum filtered to obtain the product. The product was refluxed at the boiling point of anhydrous ethanol for 24 hours and then dried at 100°C for 12 hours to obtain a surfactant-free diatomaceous earth-supported mesoporous alumina precursor.

[0094] The precursor is placed in a tube furnace and calcined at a constant temperature of 600° C. for 3 hours in an air atmosphere to obtain diatomaceous earth-supported mesoporous alumina.

[0095] S2 green body using conventional ceramic green body raw materials pressed, dried and set aside;

[0096] S3. Preparation of glaze with radiant cooling function:

[0097] The glaze comprises the following raw materials, calculated by mass percentage: 28 parts of diatomaceous earth-loaded mesoporous alumina prepared in step S1, 20 parts of α-alumina, 22 parts of high-temperature frit, 3 parts of calcined zinc oxide, 6 parts of barium carbonate, 10 parts of dolomite, 0.1 parts of silicon carbide powder, 6 parts of printing paste, and 1 part of printing ink. The raw materials are mixed, 20% by weight of water is added, and the mixture is ball-milled for 10 minutes. The mixture is then passed through a 325-mesh sieve and evenly applied to the green body obtained in step S3.

[0098] S4. The green body obtained in step S3 is calcined in a kiln at a high temperature of 1090°C for 40 minutes. After calcination, the green body is cooled to room temperature to obtain a radiant cooling ceramic tile.

[0099] Example 3

[0100] The method for preparing the ceramic brick with radiant cooling function comprises the following steps:

[0101] S1. Dissolve 1 part aluminum isopropoxide in octanol at 60°C. Add 1 part nonionic surfactant TX-100 (a polyethylene glycol derivative that acts as a nonionic surfactant) with vigorous stirring. Continue stirring for 2 hours to form solution A.

[0102] 3.5 parts of diatomaceous earth were stirred and dispersed in deionized water, and an equal amount of acetonitrile was added and stirred and dispersed to obtain a mixed suspension B;

[0103] Solution B was added to Solution A, and the mixture was stirred for 1 hour. The mixture was then aged at room temperature for 50 hours and vacuum filtered to obtain the product. The product was refluxed at the boiling point of anhydrous ethanol for 24 hours and then dried at 100°C for 12 hours to obtain a surfactant-free diatomaceous earth-supported mesoporous alumina precursor.

[0104] The precursor is placed in a tube furnace and calcined at a constant temperature of 600° C. for 3 hours in an air atmosphere to obtain diatomaceous earth-supported mesoporous alumina.

[0105] S2 green body using conventional ceramic green body raw materials pressed, dried and set aside;

[0106] S3. Preparation of glaze with radiant cooling function:

[0107] The glaze comprises the following raw materials, calculated by mass percentage: 26 parts of diatomaceous earth-loaded mesoporous alumina prepared in step S1, 20 parts of α-alumina, 24 parts of high-temperature frit, 3 parts of calcined zinc oxide, 6 parts of barium carbonate, 10 parts of dolomite, 0.1 parts of silicon carbide powder, 6 parts of printing paste, and 1 part of printing ink. The raw materials are mixed, 20% by weight of water is added, and the mixture is ball-milled for 10 minutes. The mixture is then passed through a 325-mesh sieve and evenly applied to the green body obtained in step S3.

[0108] S4. The green body obtained in step S3 is calcined in a kiln at a high temperature of 1090°C for 40 minutes. After calcination, the green body is cooled to room temperature to obtain a radiant cooling ceramic tile.

[0109] Example 4

[0110] The method for preparing the ceramic brick with radiant cooling function comprises the following steps:

[0111] S1. Dissolve 1 part aluminum isopropoxide in octanol at 60°C. Add 1 part nonionic surfactant TX-100 (a polyethylene glycol derivative that acts as a nonionic surfactant) with vigorous stirring. Continue stirring for 2 hours to form solution A.

[0112] After 3 parts of diatomaceous earth were stirred and dispersed in deionized water, an equal amount of acetonitrile was added and stirred and dispersed to obtain a mixed suspension B;

[0113] Solution B was added to Solution A, and the mixture was stirred for 1 hour. The mixture was then aged at room temperature for 60 hours and vacuum filtered to obtain the product. The product was refluxed at the boiling point of anhydrous ethanol for 24 hours and then dried at 100°C for 12 hours to obtain a surfactant-free diatomaceous earth-supported mesoporous alumina precursor.

[0114] The precursor is placed in a tube furnace and calcined at a constant temperature of 600° C. for 3 hours in an air atmosphere to obtain diatomaceous earth-supported mesoporous alumina.

[0115] S2 green body using conventional ceramic green body raw materials pressed, dried and set aside;

[0116] S3. Preparation of glaze with radiant cooling function:

[0117] The glaze comprises the following raw materials, calculated by mass percentage: 25 parts of diatomaceous earth-loaded mesoporous alumina prepared in step S1, 20 parts of α-alumina, 25 parts of high-temperature frit, 3 parts of calcined zinc oxide, 6 parts of barium carbonate, 10 parts of dolomite, 0.1 parts of silicon carbide powder, 6 parts of printing paste, and 1 part of printing ink. The raw materials are mixed, 20% by weight of water is added, and the mixture is ball-milled for 10 minutes. The mixture is then passed through a 325-mesh sieve and evenly applied to the green body obtained in step S3.

[0118] S4. The green body obtained in step S3 is calcined in a kiln at a high temperature of 1090°C for 40 minutes. After calcination, the green body is cooled to room temperature to obtain a radiant cooling ceramic tile.

[0119] Comparative Example 1

[0120] A method for preparing a ceramic tile comprises the following steps:

[0121] S1. The green body is pressed using conventional ceramic green body raw materials, dried and set aside;

[0122] S2. Preparation of glaze:

[0123] The raw materials of the glaze are composed of the following components in percentage by mass:

[0124] 30 parts of diatomaceous earth, 20 parts of α-alumina, 20 parts of high-temperature frit, 3 parts of calcined zinc oxide, 6 parts of barium carbonate, 10 parts of dolomite, 0.1 parts of silicon carbide powder, 6 parts of printing paste, and 1 part of printing ink are mixed together, 20% by weight of water is added, and the mixture is ball-milled for 10 minutes. After passing the mixture through a 325-mesh sieve, it is evenly applied to the green body obtained in step S3;

[0125] S3. The green body obtained in step S2 is calcined in a kiln at a high temperature of 1130°C for 40 minutes. After calcination, the green body is cooled to room temperature to obtain a ceramic tile.

[0126] Because the actual outdoor cooling performance of radiative cooling ceramic tiles is significantly affected by the region and environment, and spectral characteristics are measured based on standardized laboratory conditions, spectral radiation characteristics are the most important parameters for measuring the optical performance of radiative cooling materials. The two most important characteristics are the spectral reflectance in the solar band (0.3-2.5μm) and the emissivity in the "atmospheric window" infrared band (8-13μm).

[0127] The optical properties of the ceramic tiles of Examples 1-4 and Comparative Example 1 were analyzed by UV-Vis-NIR spectrophotometer and Fourier transform infrared spectrometer. The results are shown in Table 1 below:

[0128] The spectral reflectance of ceramic tiles in the solar band (0.3-2.5μm) and the infrared band (2.5-15.0μm) was measured using a UV-Vis-NIR spectrophotometer and a Fourier transform infrared spectrometer combined with an integrating sphere. The average reflectance of the ceramic tiles in the solar band and the average emissivity in the "atmospheric window" band were calculated based on the measured spectral reflectance and combined with Mie theory.

[0129] Table 1

[0130]

[0131] The test results in Table 1 show that the radiative cooling ceramic tiles prepared in Examples 1-4 have a high spectral reflectivity in the solar band (0.3-2.5 μm) and an emissivity in the "atmospheric window" infrared band (8-13 μm), and have a daytime radiative cooling function.

[0132] The above description is only a specific embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent transformation made using the present invention, or directly or indirectly applied in other related technical fields, is also included in the patent protection scope of the present invention.

Claims

1. A ceramic tile with radiant cooling function, comprising a body, characterized in that: The green body is provided with a glaze layer having a radiation cooling function; The glaze for forming the glaze layer having the radiant cooling function comprises the following raw materials in parts by weight:

2. The ceramic tile according to claim 1, characterized in that The diatomite-loaded mesoporous alumina is prepared by loading mesoporous alumina on diatomite through a sol-gel method.

3. The ceramic tile according to claim 1, characterized in that The pore diameter of the mesoporous alumina in the diatomaceous earth-loaded mesoporous alumina is 4-10 nm.

4. The ceramic tile according to claim 1, characterized in that The aluminum oxide is α-aluminum oxide.

5. The method for preparing a ceramic tile according to any one of claims 1 to 4, characterized in that: The following steps are involved: S1. Preparation of diatomite-supported mesoporous alumina Aluminum isopropoxide is dissolved in octanol and a nonionic surfactant is added to form solution A; Dispersing diatomaceous earth to obtain solution B; Solution B is added to solution A, and the mixture is aged, dried, and calcined to obtain diatomite-loaded mesoporous alumina; S2. Preparation of glaze layer with radiant cooling function Prepare materials for a glaze layer having a radiant cooling function; mix the raw materials and then ball-mill to obtain a glaze layer having a radiant cooling function; S3. Glazing Applying the glaze of the glaze layer with the radiant cooling function obtained in step S2 onto the blank to obtain a rough blank; S4. Firing The rough blank obtained in step S3 is calcined to obtain a ceramic brick with radiant cooling function.

6. The preparation method according to claim 5, characterized in that In step S1, the aging time is 48-60 hours.

7. The preparation method according to claim 5, characterized in that In step S1, the calcination temperature is 600°C.

8. The preparation method according to claim 5, characterized in that In step S2, ball milling is performed for 10 minutes, and the mixture is passed through a 325-mesh sieve.

9. The preparation method according to claim 5, characterized in that In step S4, the calcination temperature is 1100-1200°C.

10. An application of ceramic tiles with radiant cooling function, characterized in that: The ceramic brick according to any one of claims 1 to 5 or the ceramic brick prepared by the preparation method according to any one of claims 6 to 9 is applied to the field of construction.

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