A radiant cooling exterior wall brick and its preparation process

Abstract

The invention discloses a radiation cooling exterior wall brick and a preparation process thereof, and relates to the technical field of ceramic bricks. The radiant cooling exterior wall tiles include a body, a base glaze layer, a pattern layer and a protective glaze layer from the inside to the outside. The base glaze layer includes the following components in parts by mass: 40-60 parts of base glaze ceramic base glaze, 15-35 parts of cooling powder, 6-12 parts of calcined talc, 4-8 parts of calcined zinc oxide, 3-6 parts of dolomite, 2-4 parts of fluorite, 3-6 parts of calcined kaolin, 0.2-0.5 parts of sodium carboxymethyl cellulose, 0.2-0.5 parts of sodium tripolyphosphate and 40-55 parts of water; the protective glaze layer includes the following components in parts by mass: 60-70 parts of protective glaze ceramic base glaze, 10-20 parts of cooling powder, 5-10 parts of albite, 3-5 parts of calcined talc, 2-4 parts of calcined zinc oxide, 0.2-0.5 parts of sodium carboxymethyl cellulose, 0.2-0.5 parts of sodium tripolyphosphate and 40-55 parts of water. The present invention adjusts the component ratio of the base glaze layer and the protective glaze layer and simultaneously adds cooling powder for compounding, thereby ensuring the basic performance of the wall tile while improving its reflectivity and emissivity to infrared and visible light.

Description

Technical Field

[0001] The present invention relates to the technical field of ceramic tiles, and in particular to a radiation cooling exterior wall tile and a preparation process thereof. Background Art

[0002] Exterior wall tiles currently on the market have low reflectivity for visible and infrared light. While they offer some insulation, they don't effectively block the heat from visible and infrared light. This results in heat absorption from exterior walls in areas exposed to direct sunlight, raising internal temperatures. To achieve this, indoor cooling devices are increasingly relied upon, but these devices further increase energy consumption and carbon emissions, while also raising ambient temperatures.

[0003] Therefore, it is necessary to provide a radiative cooling exterior wall tile with high reflectivity to visible light and infrared light. Summary of the Invention

[0004] In order to solve the problems existing in the above-mentioned prior art, the present invention aims to provide a radiant cooling exterior wall tile and its preparation process. The radiant cooling exterior wall tile of the present invention can improve the reflectivity and emissivity of the radiant cooling wall tile to visible light and infrared light while maintaining the basic performance of the wall tile.

[0005] The present invention provides the following technical solutions:

[0006] The invention provides a radiant cooling exterior wall tile, which comprises, from the inside to the outside, a body, a ground glaze layer, a pattern layer and a protective glaze layer. The ground glaze layer comprises the following components in parts by mass: 40-60 parts of a ground glaze ceramic base glaze, 15-35 parts of cooling powder, 6-12 parts of calcined talc, 4-8 parts of calcined zinc oxide, 3-6 parts of dolomite, 2-4 parts of fluorite, 3-6 parts of calcined kaolin, 0.2-0.5 parts of sodium carboxymethyl cellulose, 0.2-0.5 parts of sodium tripolyphosphate and 40-55 parts of clean water; and the protective glaze layer comprises the following components in parts by mass: 60-70 parts of a protective glaze ceramic base glaze, 10-20 parts of cooling powder, 5-10 parts of albite, 3-5 parts of calcined talc, 2-4 parts of calcined zinc oxide, 0.2-0.5 parts of sodium carboxymethyl cellulose, 0.2-0.5 parts of sodium tripolyphosphate and 40-55 parts of clean water. The calcined talc, calcined zinc oxide and dolomite are used in combination to reduce the firing temperature of the radiant cooling ceramic base glaze; the fluorite and dolomite are mixed to adjust the thermal expansion coefficient of the radiant cooling ceramic base glaze; and the calcined kaolin can improve the plasticity of the radiant cooling ceramic base glaze.

[0007] Furthermore, the cooling powder is composed of the following components in parts by mass: 50-70 parts of Al2O3, 10-20 parts of SiO2, 5-10 parts of TiO2, 5-10 parts of CaO, and 0.5-2.0 parts of ZrO2.

[0008] Furthermore, the bottom glaze layer ceramic basic glaze is composed of the following components in mass percentage: 50-60% SiO2, 25-40% Al2O3, 0.1-0.5% Fe2O3, 0-0.2% Ti2O3, 0.5-2.0% CaO, 0.3-0.8% MgO, 0.5-1.5% K2O, 2.0-5.0% Na2O, 0.5-2.0% ZnO, 0.2-0.4% ZrO2, and the remainder is loss on ignition.

[0009] Furthermore, the protective glaze layer ceramic base glaze is composed of the following components in percentage by mass: 50-60% SiO2, 5-10% Al2O3, 0-0.3% Fe2O3, 7-14% CaO, 0.2-0.4% MgO, 2-4% BaO, 5-10% ZnO, 4-8% K2O, 1-3% Na2O, 0.3-0.6% ZrO2, 0-1.5% TiO2, and the remainder is loss on ignition.

[0010] Preferably, the thickness of the blank is greater than or equal to 12 mm.

[0011] Preferably, the thickness of the bottom glaze layer is 0.5-0.7 mm, which can achieve a good reflectivity without causing problems such as uneven brick surface or easy peeling of the glaze layer due to the glaze layer being too thick.

[0012] Preferably, the thickness of the protective glaze layer is 0.1-0.3 mm.

[0013] The present invention also provides a process for preparing the above-mentioned radiant cooling exterior wall brick, comprising the following steps:

[0014] S1, pressing the green body into shape and drying it;

[0015] S2, preparing a ground glaze layer; by weight, 40-60 parts of a ground glaze ceramic base glaze, 15-35 parts of a cooling powder, 6-12 parts of calcined talc, 4-8 parts of calcined zinc oxide, 3-6 parts of dolomite, 2-4 parts of fluorite, 3-6 parts of calcined kaolin, 0.2-0.5 parts of sodium carboxymethyl cellulose, 0.2-0.5 parts of sodium tripolyphosphate, and 40-55 parts of water are mixed and ball-milled to obtain a radiation cooling ground glaze, and the dried green body is subjected to the radiation cooling ground glaze, and the green body is dried to form a ground glaze layer on the outside of the green body;

[0016] S3, inkjet printing on the outer side of the base glaze layer to form a pattern layer;

[0017] S4, preparing a protective glaze layer; by weight, mixing 60-70 parts of a protective glaze ceramic base glaze, 10-20 parts of a cooling powder, 5-10 parts of albite, 3-5 parts of calcined talc, 2-4 parts of calcined zinc oxide, 0.2-0.5 parts of sodium carboxymethyl cellulose, 0.2-0.5 parts of sodium tripolyphosphate, and 40-55 parts of water, and ball milling to obtain a radiation cooling protective glaze; pouring the radiation cooling protective glaze on the outside of the pattern layer, and then firing and molding to form a protective glaze layer on the outside of the pattern layer;

[0018] S5. Polishing and edge grinding the protective glaze layer to obtain radiant cooling exterior wall tiles.

[0019] Preferably, the thickness of the green body after pressing should be 13 mm or more, and the thickness of the finished product after firing should be 12 mm or more.

[0020] Furthermore, the drying time is more than 10 minutes and the temperature is between 100-200°C.

[0021] Furthermore, the inkjet printing is mainly composed of light-colored textures and patterns, and the grayscale of the pattern layer is within 10%. If the grayscale is too high or the color is too dark, it will easily have a negative impact on the reflectivity of visible light.

[0022] Furthermore, the firing temperature of the firing molding is not lower than 1170° C., and the firing time is more than 40 minutes.

[0023] Preferably, the firing temperature for the firing process is between 1170°C and 1200°C. A temperature that is too low will make it difficult for the glaze to melt during the firing process, which can easily lead to problems such as uneven glaze, unsintered tiles, and poor anti-fouling properties. It will also reduce the clarity of the tile surface and affect the aesthetics. A temperature that is too high will easily make the surface of the fired tile too glossy, and a large amount of light will pass through the protective glaze layer, failing to achieve the purpose of double-layer reflection.

[0024] Furthermore, the polishing is performed by brushing with 20 groups of 240-mesh soft fibers, thereby removing any dirt that may be present on the tile surface without the need for additional waxing.

[0025] Through the above scheme design, the present invention has the following effects:

[0026] The radiant cooling exterior wall tiles of the present invention have good anti-fouling performance and excellent brick surface flatness. By adjusting the glaze formula and compounding it with cooling powder, the glossiness can be maintained at 6-10° on the basis of ensuring the basic performance of the radiant cooling ceramics, and the reflectivity and infrared emissivity of the radiant cooling ceramics to visible light can be effectively improved, thereby effectively improving the phenomenon of indoor temperature increase due to direct sunlight, significantly reducing the utilization rate and power consumption of indoor refrigeration equipment, and helping to reduce energy consumption and carbon emissions. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0028] It will be understood that when used in this specification and the appended claims, the terms “comprises” and “comprising” indicate the presence of described features, integers, steps, operations, elements and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof.

[0029] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the present invention. As used in the specification and appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms unless the context clearly indicates otherwise.

[0030] It should be further understood that the term "and / or" used in the present description and appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0031] Furthermore, terms like "approximately" and "substantially" are intended to clarify that the relevant content does not require absolute precision, but rather allows for certain deviations. For example, "approximately equal" does not simply mean absolute equality. Because absolute equality is difficult to achieve in actual production and operational processes, certain deviations generally exist. Therefore, in addition to absolute equality, "approximately equal" also encompasses the aforementioned situation of certain deviations. Taking this as an example, in other contexts, unless otherwise specified, terms like "approximately" and "substantially" have similar meanings as described above.

[0032] Example 1

[0033] A radiant cooling exterior wall tile comprises, from the inside to the outside, a body, a base glaze layer, a pattern layer and a protective glaze layer, wherein the thickness of the body is 13 mm, the thickness of the base glaze layer is 0.6 mm, and the thickness of the protective glaze layer is 0.2 mm.

[0034] The bottom glaze layer comprises the following components in parts by weight: 50 parts of bottom glaze ceramic base glaze, 20 parts of cooling powder, 8 parts of calcined talc, 8 parts of calcined zinc oxide, 5 parts of dolomite, 3 parts of fluorite, 4 parts of calcined kaolin, 0.3 parts of sodium carboxymethyl cellulose, 0.3 parts of sodium tripolyphosphate and 50 parts of water;

[0035] The protective glaze layer includes the following components in parts by mass: 70 parts of protective glaze layer ceramic base glaze, 15 parts of cooling powder, 5 parts of sodium feldspar, 4 parts of calcined talc, 3 parts of calcined zinc oxide, 0.2 parts of sodium carboxymethyl cellulose, 0.3 parts of sodium tripolyphosphate and 50 parts of water.

[0036] The cooling powder is composed of the following components in parts by mass: 65 parts of Al2O3, 15 parts of SiO2, 10 parts of TiO2, 8 parts of CaO, and 2.0 parts of ZrO2.

[0037] The ceramic base glaze of the bottom glaze layer is composed of the following components in mass percentage: 50% SiO2, 35% Al2O3, 0.3% Fe2O3, 0.1% Ti2O3, 1.2% CaO, 0.5% MgO, 1.0% K2O, 3.0% Na2O, 1.6% ZnO, 0.3% ZrO2, and the balance is loss on ignition.

[0038] The protective glaze layer ceramic base glaze is composed of the following components in percentage by mass: 50% SiO2, 10% Al2O3, 0.3% Fe2O3, 12% CaO, 0.3% MgO, 2% BaO, 8% ZnO, 8% K2O, 3% Na2O, 0.4% ZrO2, 0.5% TiO2, and the remainder is loss on ignition.

[0039] A preparation process for radiant cooling exterior wall tiles comprises the following steps:

[0040] S1, pressing the green body into shape and drying it;

[0041] S2, preparing a ground glaze layer; according to the above-mentioned mass parts, the ground glaze layer ceramic base glaze, cooling powder, calcined talc, calcined zinc oxide, dolomite, fluorite, calcined kaolin, sodium carboxymethyl cellulose, sodium tripolyphosphate and water are mixed in the above-mentioned proportions and ball-milled to obtain a radiation cooling ground glaze, and the dried green body is subjected to the radiation cooling ground glaze, and dried to form a ground glaze layer on the outside of the green body;

[0042] S3. Inkjet printing is performed on the outside of the base glaze layer to form a pattern layer. The inkjet printing mainly uses light-colored textures and patterns, and the grayscale of the pattern layer is 9%.

[0043] S4, preparing a protective glaze layer; according to the above-mentioned mass parts, the protective glaze layer ceramic base glaze, cooling powder, sodium feldspar, calcined talc, calcined zinc oxide, sodium carboxymethyl cellulose, sodium tripolyphosphate and water are mixed and ball-milled in the above-mentioned proportions to obtain a radiation cooling protective glaze; pouring the radiation cooling protective glaze on the outside of the pattern layer, and then firing at a temperature of 1170°C for 60 minutes, and forming a protective glaze layer on the outside of the pattern layer after firing;

[0044] S5. The protective glaze layer is brushed and polished with 20 groups of 240-mesh soft fibers, and the edges are ground to obtain radiant cooling exterior wall tiles.

[0045] Example 2

[0046] A radiant cooling exterior wall tile comprises, from the inside to the outside, a body, a base glaze layer, a pattern layer and a protective glaze layer, wherein the thickness of the body is 13 mm, the thickness of the base glaze layer is 0.5 mm, and the thickness of the protective glaze layer is 0.1 mm.

[0047] The bottom glaze layer includes the following components in parts by weight: 55 parts of bottom glaze ceramic base glaze, 30 parts of cooling powder, 10 parts of calcined talc, 5 parts of calcined zinc oxide, 4 parts of dolomite, 2 parts of fluorite, 5 parts of calcined kaolin, 0.3 parts of sodium carboxymethyl cellulose, 0.3 parts of sodium tripolyphosphate and 50 parts of water;

[0048] The protective glaze layer includes the following components in parts by mass: 65 parts of protective glaze layer ceramic base glaze, 10 parts of cooling powder, 8 parts of sodium feldspar, 5 parts of calcined talc, 4 parts of calcined zinc oxide, 0.2 parts of sodium carboxymethyl cellulose, 0.3 parts of sodium tripolyphosphate and 50 parts of water.

[0049] The cooling powder is composed of the following components in parts by mass: 65 parts of Al2O3, 15 parts of SiO2, 10 parts of TiO2, 8 parts of CaO, and 2 parts of ZrO2.

[0050] The ceramic base glaze of the bottom glaze layer is composed of the following components in mass percentage: 58% SiO2, 30% Al2O3, 0.1% Fe2O3, 0.2% Ti2O3, 0.5% CaO, 0.38% MgO, 0.7% K2O, 2.0% Na2O, 0.5% ZnO, 0.2% ZrO2, and the balance is loss on ignition.

[0051] The protective glaze layer ceramic base glaze is composed of the following components in percentage by mass: 60% SiO2, 8% Al2O3, 10% CaO, 0.4% MgO, 3% BaO, 5% ZnO, 6% K2O, 2% Na2O, 0.6% ZrO2, 1% TiO2, and the remainder is loss on ignition.

[0052] A preparation process for radiant cooling exterior wall tiles comprises the following steps:

[0053] S1, pressing the green body into shape and drying it;

[0054] S2, preparing a ground glaze layer; according to the above-mentioned mass parts, the ground glaze layer ceramic base glaze, cooling powder, calcined talc, calcined zinc oxide, dolomite, fluorite, calcined kaolin, sodium carboxymethyl cellulose, sodium tripolyphosphate and water are mixed in the above-mentioned proportions and ball-milled to obtain a radiation cooling ground glaze, and the dried green body is subjected to the radiation cooling ground glaze, and dried to form a ground glaze layer on the outside of the green body;

[0055] S3. Inkjet printing is performed on the outside of the base glaze layer to form a pattern layer. The inkjet printing mainly uses light-colored textures and patterns, and the grayscale of the pattern layer is 10%;

[0056] S4, preparing a protective glaze layer; according to the above-mentioned mass parts, the protective glaze layer ceramic base glaze, cooling powder, sodium feldspar, calcined talc, calcined zinc oxide, sodium carboxymethyl cellulose, sodium tripolyphosphate and water are mixed and ball-milled in the above-mentioned proportions to obtain a radiation cooling protective glaze; the radiation cooling protective glaze is poured on the outside of the pattern layer, and then fired at a temperature of 1200° C. for 40 minutes, and a protective glaze layer is formed on the outside of the pattern layer after firing;

[0057] S5. The protective glaze layer is brushed and polished with 20 groups of 240-mesh soft fibers, and the edges are ground to obtain radiant cooling exterior wall tiles.

[0058] Example 3

[0059] A radiant cooling exterior wall tile comprises, from the inside to the outside, a body, a base glaze layer, a pattern layer and a protective glaze layer, wherein the thickness of the body is 13 mm, the thickness of the base glaze layer is 0.5 mm, and the thickness of the protective glaze layer is 0.1 mm.

[0060] The bottom glaze layer comprises the following components in parts by weight: 60 parts of bottom glaze ceramic base glaze, 35 parts of cooling powder, 6 parts of calcined talc, 4 parts of calcined zinc oxide, 3 parts of dolomite, 2 parts of fluorite, 6 parts of calcined kaolin, 0.3 parts of sodium carboxymethyl cellulose, 0.3 parts of sodium tripolyphosphate and 50 parts of water;

[0061] The protective glaze layer includes the following components in parts by mass: 70 parts of protective glaze layer ceramic base glaze, 20 parts of cooling powder, 10 parts of sodium feldspar, 3 parts of calcined talc, 2 parts of calcined zinc oxide, 0.2 parts of sodium carboxymethyl cellulose, 0.3 parts of sodium tripolyphosphate and 50 parts of water.

[0062] The cooling powder is composed of the following components in parts by mass: 60 parts of Al2O3, 20 parts of SiO2, 8.5 parts of TiO2, 10 parts of CaO, and 1.5 parts of ZrO2.

[0063] The ceramic base glaze of the bottom glaze layer is composed of the following components in mass percentage: 60% SiO2, 25% Al2O3, 0.5% Fe2O3, 0.15% Ti2O3, 2% CaO, 0.8% MgO, 1.5% K2O, 5% Na2O, 2% ZnO, 0.4% ZrO2, and the balance is loss on ignition.

[0064] The protective glaze layer ceramic base glaze is composed of the following components in percentage by mass: 58% SiO2, 5% Al2O3, 0.2% Fe2O3, 7% CaO, 0.3% MgO, 3.5% BaO, 10% ZnO, 7% K2O, 2.5% Na2O, 0.5% ZrO2, 1.5% TiO2, and the remainder is loss on ignition.

[0065] A preparation process for radiant cooling exterior wall tiles comprises the following steps:

[0066] S1, pressing the green body into shape and drying it;

[0067] S2, preparing a ground glaze layer; according to the above-mentioned mass parts, the ground glaze layer ceramic base glaze, cooling powder, calcined talc, calcined zinc oxide, dolomite, fluorite, calcined kaolin, sodium carboxymethyl cellulose, sodium tripolyphosphate and water are mixed in the above-mentioned proportions and ball-milled to obtain a radiation cooling ground glaze, and the dried green body is subjected to the radiation cooling ground glaze, and dried to form a ground glaze layer on the outside of the green body;

[0068] S3. Inkjet printing is performed on the outside of the base glaze layer to form a pattern layer. The inkjet printing mainly uses light-colored textures and patterns, and the grayscale of the pattern layer is 9%.

[0069] S4, preparing a protective glaze layer; according to the above-mentioned mass parts, the protective glaze layer ceramic base glaze, cooling powder, sodium feldspar, calcined talc, calcined zinc oxide, sodium carboxymethyl cellulose, sodium tripolyphosphate and water are mixed and ball-milled in the above-mentioned proportions to obtain a radiation cooling protective glaze; pouring the radiation cooling protective glaze on the outside of the pattern layer, and then firing at a temperature of 1170°C for 50 minutes, and forming a protective glaze layer on the outside of the pattern layer after firing;

[0070] S5. The protective glaze layer is brushed and polished with 20 groups of 240-mesh soft fibers, and the edges are ground to obtain radiant cooling exterior wall tiles.

[0071] Example 4

[0072] A radiant cooling exterior wall tile comprises, from the inside to the outside, a body, a base glaze layer, a pattern layer and a protective glaze layer, wherein the thickness of the body is 13 mm, the thickness of the base glaze layer is 0.6 mm, and the thickness of the protective glaze layer is 0.3 mm.

[0073] The bottom glaze layer includes the following components in parts by weight: 40 parts of bottom glaze layer ceramic base glaze, 15 parts of cooling powder, 12 parts of calcined talc, 8 parts of calcined zinc oxide, 6 parts of dolomite, 4 parts of fluorite, 3 parts of calcined kaolin, 0.3 parts of sodium carboxymethyl cellulose, 0.3 parts of sodium tripolyphosphate and 50 parts of water;

[0074] The protective glaze layer includes the following components in parts by mass: 60 parts of protective glaze layer ceramic base glaze, 13 parts of cooling powder, 6 parts of sodium feldspar, 4 parts of calcined talc, 2 parts of calcined zinc oxide, 0.2 parts of sodium carboxymethyl cellulose, 0.3 parts of sodium tripolyphosphate and 50 parts of water.

[0075] The cooling powder is composed of the following components in percentage by mass: 50 parts of Al2O3, 20 parts of SiO2, 10 parts of TiO2, 10 parts of CaO, and 0.5 parts of ZrO2.

[0076] The ceramic base glaze of the bottom glaze layer is composed of the following components in percentage by mass: 53% SiO2, 40% Al2O3, 0.1% Fe2O3, 0.8% CaO, 0.5% MgO, 0.5% K2O, 2% Na2O, 1% ZnO, 0.2% ZrO2, and the remainder is loss on ignition.

[0077] The protective glaze layer ceramic base glaze is composed of the following components in percentage by mass: 56% SiO2, 7% Al2O3, 0.15% Fe2O3, 14% CaO, 0.2% MgO, 4% BaO, 9% ZnO, 4% K2O, 1% Na2O, 0.3% ZrO2, and the remainder is loss on ignition.

[0078] A preparation process for radiant cooling exterior wall tiles comprises the following steps:

[0079] S1, pressing the green body into shape and drying it;

[0080] S2, preparing a ground glaze layer; according to the above-mentioned mass parts, the ground glaze layer ceramic base glaze, cooling powder, calcined talc, calcined zinc oxide, dolomite, fluorite, calcined kaolin, sodium carboxymethyl cellulose, sodium tripolyphosphate and water are mixed in the above-mentioned proportions and ball-milled to obtain a radiation cooling ground glaze, and the dried green body is subjected to the radiation cooling ground glaze, and dried to form a ground glaze layer on the outside of the green body;

[0081] S3. Inkjet printing is performed on the outside of the base glaze layer to form a pattern layer. The inkjet printing mainly uses light-colored textures and patterns, and the grayscale of the pattern layer is 9%.

[0082] S4, preparing a protective glaze layer; according to the above-mentioned mass parts, the protective glaze layer ceramic base glaze, cooling powder, sodium feldspar, calcined talc, calcined zinc oxide, sodium carboxymethyl cellulose, sodium tripolyphosphate and water are mixed and ball-milled in the above-mentioned proportions to obtain a radiation cooling protective glaze; pouring the radiation cooling protective glaze on the outside of the pattern layer, and then firing at a temperature of 1200° C. for 50 minutes, and forming a protective glaze layer on the outside of the pattern layer after firing;

[0083] S5. The protective glaze layer is brushed and polished with 20 groups of 240-mesh soft fibers, and the edges are ground to obtain radiant cooling exterior wall tiles.

[0084] In order to illustrate the technical effects of the present invention, comparative examples 1-19 are set up as follows based on the above embodiments 1-4.

[0085] Comparative Example 1

[0086] The only difference between this comparative example and Example 1 is that the thickness of the bottom glaze layer is 0.4 mm.

[0087] Comparative Example 2

[0088] The only difference between this comparative example and Example 1 is that the thickness of the bottom glaze layer is 0.9 mm.

[0089] Comparative Example 3

[0090] The only difference between this comparative example and Example 1 is that the thickness of the protective glaze layer is 0.05 mm.

[0091] Comparative Example 4

[0092] The only difference between this comparative example and Example 1 is that the thickness of the protective glaze layer is 0.4 mm.

[0093] Comparative Example 5

[0094] The only difference between this comparative example and Example 1 is that the bottom glaze layer does not contain calcined zinc oxide.

[0095] Comparative Example 6

[0096] The only difference between this comparative example and Example 1 is that the bottom glaze layer does not contain calcined talc.

[0097] Comparative Example 7

[0098] The only difference between this comparative example and Example 1 is that the bottom glaze layer does not contain dolomite.

[0099] Comparative Example 8

[0100] The only difference between this comparative example and Example 1 is that the bottom glaze layer does not contain fluorite.

[0101] Comparative Example 9

[0102] The only difference between this comparative example and Example 1 is that the bottom glaze layer does not contain cooling powder.

[0103] Comparative Example 10

[0104] The only difference between this comparative example and Example 1 is that the mass fraction of calcined talc in the bottom glaze layer is 4 parts.

[0105] Comparative Example 11

[0106] The only difference between this comparative example and Example 1 is that the mass fraction of dolomite in the bottom glaze layer is 2 parts.

[0107] Comparative Example 12

[0108] The only difference between this comparative example and Example 1 is that the mass fraction of the cooling powder in the bottom glaze layer is 10 parts.

[0109] Comparative Example 13

[0110] The only difference between this comparative example and Example 1 is that the mass fraction of the cooling powder in the bottom glaze layer is 40 parts.

[0111] Comparative Example 14

[0112] The only difference between this comparative example and Example 1 is that the mass percentage of TiO2 in the cooling powder of the bottom glaze layer is 3%.

[0113] Comparative Example 15

[0114] The only difference between this comparative example and Example 1 is that the cooling powder of the bottom glaze layer does not contain ZrO2.

[0115] Comparative Example 16

[0116] The only difference between this comparative example and Example 1 is that the protective glaze layer does not contain cooling powder.

[0117] Comparative Example 17

[0118] The only difference between this comparative example and Example 1 is that the grayscale of the pattern layer is 12%.

[0119] Comparative Example 18

[0120] The only difference between this comparative example and Example 1 is that the firing temperature in the preparation process of the radiation cooling exterior wall bricks is 1100°C.

[0121] Comparative Example 19

[0122] The only difference between this comparative example and Example 1 is that the firing temperature in the preparation process of the radiation cooling exterior wall bricks is 1500°C.

[0123] Comparative Example 20

[0124] The only difference between this comparative example and Example 1 is that the firing time in the preparation process of the radiation cooling exterior wall bricks is 30 minutes.

[0125] To further illustrate the technical effects of the present invention, the radiant cooling exterior wall tiles of the above-mentioned Examples 1-4 and Comparative Examples 1-20 were respectively taken according to the specifications of 600*1200mm for performance testing, and the flatness, anti-fouling performance, glossiness, reflectivity and infrared emissivity of the brick surface were tested respectively. The test results are shown in Table 1 below.

[0126] Table 1 Performance test results

[0127] Brick surface flatness Antifouling performance Glossiness Reflectivity Infrared emissivity Example 1 -0.2~+0.2-0.2~+0.3 Level 5 8.5 91.8 93.1 Example 2 -0.1~+0.2-0.3~+0.3 Level 5 7 92.6 94.2 Example 3 -0.1~+0.2-0.3~+0.4 Level 5 7.5 92.5 92.9 Example 4 -0.1~+0.1-0.2~+0.3 Level 5 9.5 90.6 91.8 Comparative Example 1 -0.1~+0.1-0.3~+0.2 Level 5 9 88.2 90.2 Comparative Example 2 -0.4~+0.3-0.6~+0.7 Level 3 5 91.3 92.1 Comparative Example 3 -0.1~+0.1-0.2~+0.2 Level 3 7 90.2 90.8 Comparative Example 4 -0.1~+0.2-0.3~+0.3 Level 5 7.5 87.5 88.1 Comparative Example 5 -0.4~+0.3-0.6~+0.5 Level 3 5 86.1 84.3 Comparative Example 6 -0.7~+0.6-1.2~+1.5 Level 3 4.5 86.3 94.8 Comparative Example 7 -0.6~+0.5-0.9~+1.0 Level 5 5.5 87.8 86.5 Comparative Example 8 -0.4~+0.4-0.5~+0.6 Level 5 6.5 87.6 87.2 Comparative Example 9 -0.1~+0.2-0.3~+0.3 Level 5 13.5 72.5 70.9 Comparative Example 10 -0.5~+0.5-0.8~+0.7 Level 5 6 88.3 88.2 Comparative Example 11 -0.3~+0.4-0.6~+0.7 Level 5 6.5 87.3 87.7 Comparative Example 12 -0.1~+0.1-0.3~+0.2 Level 5 9 85.4 85.3 Comparative Example 13 -0.4~+0.5-0.6~+0.8 Level 3 5.5 91.2 90.9 Comparative Example 14 -0.2~+0.4-0.3~+0.5 Level 5 7 87.1 86.8 Comparative Example 15 -0.2~+0.3-0.3~+0.5 Level 5 7.5 86.8 84.8 Comparative Example 16 -0.1~+0.2-0.3~+0.4 Level 5 10.5 87.9 87.4 Comparative Example 17 -0.2~+0.2-0.2~+0.3 Level 5 8.5 87.2 86.5 Comparative Example 18 -0.2~+0.2-0.2~+0.3 Level 3 4.5 84.5 83.7 Comparative Example 19 -0.2~+0.2-0.2~+0.3 Level 5 24 81.3 84.6 Comparative Example 20 -0.2~+0.2-0.2~+0.3 Level 3 5.5 85.7 84.4

[0128] As shown in Table 1, the brick surfaces of Examples 1-4 of the present invention have good flatness and antifouling properties, the glossiness is maintained at 6-10°, and the reflectivity and infrared emissivity are both above 90%.

[0129] Compared with the embodiments of the present invention, when the component ratio or preparation process of each substance in this application is changed, it is easy to cause certain negative effects on its performance. When the thickness of the bottom glaze layer in the technical solution of the present invention is changed, the flatness and anti-fouling performance of the radiant cooling exterior wall tiles are easily affected; when the thickness of the protective glaze layer is changed, its reflectivity and infrared emissivity are easily affected; when the components in the bottom glaze layer are changed, the flatness of the tile surface is easily poor, and its anti-fouling performance and glossiness are also significantly affected; when the bottom glaze layer or the protective glaze layer does not contain the cooling powder of the present invention, the gloss of the radiant cooling exterior wall tiles will be too high, and its reflectivity of visible light and infrared emissivity will be significantly reduced; when the ratio of the various substances in the bottom glaze layer is changed, it will cause the tile surface to be uneven, and it is also easy to have a certain negative impact on the reflectivity and infrared emissivity; when the gray color of the pattern layer is too high or the color is too dark, it is easy to cause poor reflectivity and infrared emissivity; and when the firing time is too short or the temperature is too low, it is easy to have a negative impact on its anti-fouling performance and gloss, reduce the clarity of the tile surface, and affect the aesthetics; if the firing temperature is too high, the surface gloss of the fired tile will be too high, and a large amount of light will pass through the protective glaze layer, failing to achieve the purpose of double-layer reflection.

[0130] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and such modifications or substitutions are intended to be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A radiant cooling exterior wall brick, characterized in that: From the inside to the outside, it includes a body, a bottom glaze layer, a pattern layer and a protective glaze layer, wherein the bottom glaze layer includes the following components in parts by mass: 40-60 parts of a base ceramic glaze for the bottom glaze layer, 15-35 parts of a cooling powder, 6-12 parts of calcined talc, 4-8 parts of calcined zinc oxide, 3-6 parts of dolomite, 2-4 parts of fluorite, 3-6 parts of calcined kaolin, 0.2-0.5 parts of sodium carboxymethyl cellulose, 0.2-0.5 parts of sodium tripolyphosphate and 40-55 parts of water; the protective glaze layer includes the following components in parts by mass: 60-70 parts of a base ceramic glaze for the protective glaze layer, 10-20 parts of a cooling powder, 5-10 parts of albite, 3-5 parts of calcined talc, 2-4 parts of calcined zinc oxide, 0.2-0.5 parts of sodium carboxymethyl cellulose, 0.2-0.5 parts of sodium tripolyphosphate and 40-55 parts of water; The cooling powder is composed of the following components in parts by mass: 50-70 parts of Al2O3, 10-20 parts of SiO2, 5-10 parts of TiO2, 5-10 parts of CaO, and 0.5-2.0 parts of ZrO2; The glossiness of the radiant cooling exterior wall tiles is maintained at 6-10°, and the reflectivity and infrared emissivity of the radiant cooling exterior wall tiles are both above 90%.

2. The radiant cooling exterior wall brick according to claim 1, characterized in that: The bottom glaze layer ceramic basic glaze is composed of the following components in mass percentage: 50-60% SiO2, 25-40% Al2O3, 0.1-0.5% Fe2O3, 0-0.2% Ti2O3, 0.5-2.0% CaO, 0.3-0.8% MgO, 0.5-1.5% K2O, 2.0-5.0% Na2O, 0.5-2.0% ZnO, 0.2-0.4% ZrO2, and the balance is loss on ignition.

3. The radiant cooling exterior wall brick according to claim 2, characterized in that: The protective glaze layer ceramic base glaze is composed of the following components in percentage by mass: 50-60% SiO2, 5-10% Al2O3, 0-0.3% Fe2O3, 7-14% CaO, 0.2-0.4% MgO, 2-4% BaO, 5-10% ZnO, 4-8% K2O, 1-3% Na2O, 0.3-0.6% ZrO2, 0-1.5% TiO2, and the remainder is loss on ignition.

4. The radiant cooling exterior wall brick according to claim 1, characterized in that: The thickness of the blank is greater than or equal to 12 mm.

5. The radiant cooling exterior wall brick according to claim 4, characterized in that: The thickness of the bottom glaze layer is 0.5-0.7 mm.

6. The radiant cooling exterior wall brick according to claim 5, characterized in that: The thickness of the protective glaze layer is 0.1-0.3 mm.

7. The process for preparing the radiant cooling exterior wall brick according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1, pressing the green body into shape and drying it; S2, preparing a ground glaze layer; by weight, 40-60 parts of a ground glaze ceramic base glaze, 15-35 parts of a cooling powder, 6-12 parts of calcined talc, 4-8 parts of calcined zinc oxide, 3-6 parts of dolomite, 2-4 parts of fluorite, 3-6 parts of calcined kaolin, 0.2-0.5 parts of sodium carboxymethyl cellulose, 0.2-0.5 parts of sodium tripolyphosphate, and 40-55 parts of water are mixed and ball-milled to obtain a radiation cooling ground glaze, and the dried green body is subjected to the radiation cooling ground glaze, and the green body is dried to form a ground glaze layer on the outside of the green body; S3, inkjet printing on the outer side of the base glaze layer to form a pattern layer; S4, preparing a protective glaze layer; by weight, mixing 60-70 parts of a protective glaze ceramic base glaze, 10-20 parts of a cooling powder, 5-10 parts of albite, 3-5 parts of calcined talc, 2-4 parts of calcined zinc oxide, 0.2-0.5 parts of sodium carboxymethyl cellulose, 0.2-0.5 parts of sodium tripolyphosphate, and 40-55 parts of water, and ball milling to obtain a radiation cooling protective glaze; pouring the radiation cooling protective glaze on the outside of the pattern layer, and then firing and molding to form a protective glaze layer on the outside of the pattern layer; S5. Polishing and edge grinding the protective glaze layer to obtain radiant cooling exterior wall tiles.

8. The process for preparing the radiant cooling exterior wall brick according to claim 7, characterized in that: The inkjet printing is mainly composed of light-colored textures and patterns, and the grayscale of the pattern layer is within 10%.

9. The process for preparing the radiant cooling exterior wall brick according to claim 8, characterized in that: The firing temperature of the firing molding is not lower than 1170° C., and the firing time is more than 40 minutes.