Radiation refrigeration external wall brick and preparation process thereof

Abstract

The invention discloses a radiation refrigeration exterior wall tile and a preparation process thereof, and relates to the technical field of ceramic tiles. The radiation refrigeration external wall tile comprises a green body, a ground coat layer, a pattern layer and a protective glaze layer from inside to outside, the ground glaze layer comprises the following components in parts by mass: 40-60 parts of ground glaze layer ceramic basic 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 part of sodium carboxymethyl cellulose, 0.2-0.5 part of sodium tripolyphosphate and 40-55 parts of clear water; the protective glaze layer comprises the following components in parts by mass: 60-70 parts of protective glaze layer ceramic basic 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 part of sodium carboxymethyl cellulose, 0.2-0.5 part of sodium tripolyphosphate and 40-55 parts of clear water. By adjusting the component proportion of the ground coat layer and the protective glaze layer and adding the cooling powder for compounding, the basic performance of the wall brick can be ensured, and the reflection and radiance of the wall brick to infrared rays and visible light can be improved.

Description

Technical Field

[0001] The 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] The reflectivity of the exterior wall tiles on the market is not high for visible light and infrared light. Although they have certain thermal insulation functions, they cannot effectively isolate the heat of visible light and infrared light. This results in the absorption of heat by the exterior walls of buildings in most areas where the sun shines directly, causing the temperature inside the building to rise. In order to achieve the purpose of cooling, we have to rely more on indoor cooling equipment, but these equipment further increase energy consumption and carbon emissions, and also increase the temperature of the surrounding environment.

[0003] Therefore, it is necessary to provide a radiant 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 purpose of the present invention is to provide a radiation cooling exterior wall brick and its preparation process. The radiation cooling exterior wall brick of the present invention can improve the reflection and emissivity of the radiation cooling wall brick to visible light and infrared light while ensuring the basic performance of the wall brick.

[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 bottom glaze layer, a pattern layer and a protective glaze layer, wherein the bottom glaze layer comprises the following components in parts by mass: 40-60 parts of a bottom glaze layer ceramic basic 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 clean water; and the protective glaze layer comprises the following components in parts by mass: 60-70 parts of a protective glaze layer ceramic basic 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 clean water. The calcined talc, calcined zinc oxide and dolomite can be used together to reduce the firing temperature of the radiant cooling ceramic base glaze; the fluorite and dolomite can be mixed to adjust the thermal expansion coefficient of the radiant cooling ceramic base glaze; 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 base ceramic glaze of the bottom glaze layer is composed of the following components in percentage by mass: 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 good reflectivity without causing problems such as uneven brick surface / 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 preparation process of the above-mentioned radiation cooling exterior wall brick, comprising the following steps:

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

[0015] S2, preparing a bottom glaze layer; by weight, 40-60 parts of bottom 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 are mixed and ball-milled to obtain a radiation cooling bottom glaze, and the dried green body is subjected to the radiation cooling bottom glaze, and the green body is dried to form a bottom 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 and ball-milling 60-70 parts of a protective glaze layer 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 clean water to obtain a radiation cooling protective glaze; pouring the radiation cooling protective glaze on the outer side of the pattern layer, and then firing and molding, to form a protective glaze layer on the outer side of the pattern layer;

[0018] S5. Polishing and edge grinding the protective glaze layer to obtain radiation 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 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 is easy to have a negative impact on the reflectivity of visible light.

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

[0023] Preferably, the firing temperature of the firing molding is 1170-1200°C. If the temperature is too low, the glaze surface will be difficult to melt during the firing process, which may easily lead to problems such as uneven glaze surface, unsintered, poor anti-fouling performance, etc., and will also reduce the clarity of the tile surface and affect the aesthetics. If the 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, which will not 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 some dirt that may exist 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 radiation cooling exterior wall bricks of the present invention have good antifouling performance and good brick surface flatness. By adjusting the glaze formula and compounding with the cooling powder, the glossiness can be maintained at 6-10° on the basis of ensuring the basic performance of the radiation cooling ceramics, and the reflectivity and infrared emissivity of the radiation 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 being conducive to reducing energy consumption and carbon emissions. DETAILED DESCRIPTION

[0027] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0029] It should also be understood that the terms used in this specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the specification of the present invention and the appended claims, the singular forms "a", "an" and "the" are intended to include 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 the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0031] In addition, the terms "roughly" and "basically" are intended to explain that the relevant content does not require absolute precision, but can have certain deviations. For example, "roughly equal" does not only mean absolute equality. Since it is difficult to achieve absolute "equality" in actual production and operation, there are generally certain deviations. Therefore, in addition to absolute equality, "roughly equal" also includes the above-mentioned situation with certain deviations. Taking this as an example, in other cases, unless otherwise specified, the terms "roughly" and "basically" have similar meanings to the above.

[0032] Example 1

[0033] A radiant cooling exterior wall tile comprises a body, a base glaze layer, a pattern layer and a protective glaze layer from the inside to the outside, 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 includes the following components 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 clean 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 albite, 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 clean 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 remainder is the 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 of a radiant cooling exterior wall brick comprises the following steps:

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

[0041] S2, preparing a bottom glaze layer; according to the above mass fractions, mixing the bottom glaze ceramic base glaze, cooling powder, calcined talc, calcined zinc oxide, dolomite, fluorite, calcined kaolin, sodium carboxymethyl cellulose, sodium tripolyphosphate and clean water in the above proportions and ball milling to obtain a radiation cooling bottom glaze, applying the radiation cooling bottom glaze to the dried green body, drying, and forming a bottom glaze layer on the outside of the green body;

[0042] S3, inkjet printing is performed on the outer side of the base glaze layer to form a pattern layer; the inkjet printing is mainly 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 mass fractions, mixing and ball-milling the protective glaze layer ceramic base glaze, cooling powder, albite, calcined talc, calcined zinc oxide, sodium carboxymethyl cellulose, sodium tripolyphosphate and clean water in the above 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 and molding;

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

[0045] Example 2

[0046] A radiant cooling exterior wall tile comprises a body, a base glaze layer, a pattern layer and a protective glaze layer from the inside to the outside, 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 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 clean 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 albite, 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 clean 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 remainder is the 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 of a radiant cooling exterior wall brick comprises the following steps:

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

[0054] S2, preparing a bottom glaze layer; according to the above mass fractions, mixing the bottom glaze ceramic base glaze, cooling powder, calcined talc, calcined zinc oxide, dolomite, fluorite, calcined kaolin, sodium carboxymethyl cellulose, sodium tripolyphosphate and clean water in the above proportions and ball milling to obtain a radiation cooling bottom glaze, applying the radiation cooling bottom glaze to the dried green body, drying, and forming a bottom glaze layer on the outside of the green body;

[0055] S3, inkjet printing is performed on the outer side of the base glaze layer to form a pattern layer; the inkjet printing is mainly 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 mass fractions, mixing and ball-milling the protective glaze layer ceramic base glaze, cooling powder, albite, calcined talc, calcined zinc oxide, sodium carboxymethyl cellulose, sodium tripolyphosphate and clean water in the above 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 40 minutes, and forming a protective glaze layer on the outside of the pattern layer after firing and molding;

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

[0058] Example 3

[0059] A radiant cooling exterior wall tile comprises a body, a base glaze layer, a pattern layer and a protective glaze layer from the inside to the outside, 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 includes 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 clean 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 albite, 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 clean 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 percentage by mass: 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 remainder 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 of a radiant cooling exterior wall brick comprises the following steps:

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

[0067] S2, preparing a bottom glaze layer; according to the above mass fractions, mixing the bottom glaze ceramic base glaze, cooling powder, calcined talc, calcined zinc oxide, dolomite, fluorite, calcined kaolin, sodium carboxymethyl cellulose, sodium tripolyphosphate and clean water in the above proportions and ball milling to obtain a radiation cooling bottom glaze, applying the radiation cooling bottom glaze to the dried green body, drying, and forming a bottom glaze layer on the outside of the green body;

[0068] S3, inkjet printing is performed on the outer side of the base glaze layer to form a pattern layer; the inkjet printing is mainly 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 mass fractions, mixing and ball-milling the protective glaze layer ceramic base glaze, cooling powder, albite, calcined talc, calcined zinc oxide, sodium carboxymethyl cellulose, sodium tripolyphosphate and clean water in the above 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 and molding;

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

[0071] Example 4

[0072] A radiant cooling exterior wall tile comprises a body, a base glaze layer, a pattern layer and a protective glaze layer from the inside to the outside, 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 by weight: 40 parts of bottom glaze 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 clean 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 albite, 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 clean 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 the 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 of a radiant cooling exterior wall brick comprises the following steps:

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

[0080] S2, preparing a bottom glaze layer; according to the above mass fractions, mixing the bottom glaze ceramic base glaze, cooling powder, calcined talc, calcined zinc oxide, dolomite, fluorite, calcined kaolin, sodium carboxymethyl cellulose, sodium tripolyphosphate and clean water in the above proportions and ball milling to obtain a radiation cooling bottom glaze, applying the radiation cooling bottom glaze to the dried green body, drying, and forming a bottom glaze layer on the outside of the green body;

[0081] S3, inkjet printing is performed on the outer side of the base glaze layer to form a pattern layer; the inkjet printing is mainly 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 mass fractions, mixing and ball-milling the protective glaze layer ceramic base glaze, cooling powder, albite, calcined talc, calcined zinc oxide, sodium carboxymethyl cellulose, sodium tripolyphosphate and clean water in the above 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 and molding;

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

[0084] In order to illustrate the technical effect of the present invention, comparative examples 1-19 are set up as follows based on the above-mentioned 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 base 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 base 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 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 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 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 difference between this comparative example and Example 1 is that the mass percentage of TiO2 in the cooling powder of the base 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 base 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 brick is 1100°C.

[0121] Comparative Example 19

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

[0123] Comparative Example 20

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

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

[0126] Table 1 Performance test results

[0127]

[0128]

[0129] As shown in Table 1, the brick surfaces of Examples 1-4 of the present invention have good flatness and antifouling properties, the glossiness can be maintained at 6-10°, and the reflectivity and infrared radiation rate can reach more than 90%.

[0130] Compared with the embodiments of the present invention, when the composition ratio or preparation process of each substance in the present application is changed, it is easy to cause a certain negative impact on its performance. When the thickness of the bottom glaze layer in the technical solution of the present invention is changed, it is easy to affect the flatness and anti-fouling performance of the brick surface of the radiation cooling exterior wall tile; when the thickness of the protective glaze layer is changed, it is easy to affect its reflectivity and infrared emissivity; when the components in the bottom glaze layer are changed, it is easy to make the brick surface flat, and the impact on its anti-fouling performance and glossiness is also more obvious; when the bottom glaze layer or the protective glaze layer does not contain the cooling powder of the present invention, the glossiness of the radiation cooling exterior wall tile will be too high, and its reflectivity and infrared emissivity to visible light will be significantly reduced; when the ratio of each substance in the bottom glaze layer is changed, it will cause the brick surface to be uneven, and it is also easy to cause a certain negative impact on the reflectivity and infrared emissivity; when the grayness of the pattern layer is too high and the color is too dark, it is easy to cause the problem of 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 glossiness, reduce the clarity of the brick surface, and affect the aesthetics; if the firing temperature is too high, it is easy to make the surface gloss of the fired tile too high, and a large amount of light will pass through the protective glaze layer, and the purpose of double-layer reflection cannot be achieved.

[0131] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope 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. The bottom glaze layer includes the following components in mass fractions: 40-60 parts of bottom glaze layer ceramic basic 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; the protective glaze layer includes the following components in mass fractions: 60-70 parts of protective glaze layer ceramic basic 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.

2. The radiant cooling exterior wall brick according to claim 1, characterized in that: 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.

3. The radiant cooling exterior wall brick according to claim 2, 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 remainder is ignition loss.

4. The radiant cooling exterior wall brick according to claim 3, characterized in that: The protective glaze layer ceramic basic 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.

5. 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.

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

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

8. The process for preparing the radiation cooling exterior wall brick according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1, pressing and drying the green body; S2, preparing a bottom glaze layer; by weight, 40-60 parts of a bottom 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 clean water are mixed and ball-milled to obtain a radiation cooling bottom glaze, and the dried body is subjected to the radiation cooling bottom glaze, and dried to form a bottom glaze layer on the outside of the 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 and ball-milling 60-70 parts of a protective glaze layer 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 clean water to obtain a radiation cooling protective glaze; pouring the radiation cooling protective glaze on the outer side of the pattern layer, and then firing and molding, to form a protective glaze layer on the outer side of the pattern layer; S5. Polishing and edge grinding the protective glaze layer to obtain radiation cooling exterior wall tiles.

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

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

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