A heat-absorbing ceramic glaze and a preparation method thereof, and a heat-absorbing ceramic tile

Abstract

The application belongs to the technical field of building ceramics, and particularly discloses a heat-absorbing ceramic glaze, a preparation method thereof and a heat-absorbing ceramic tile. The raw material components of the heat-absorbing ceramic glaze include a base glaze and a heat-absorbing agent, wherein the heat-absorbing agent includes indium tin oxide and / or antimony tin oxide, and the base glaze contains Li2O and / or Na2O in the chemical composition. The heat-absorbing ceramic glaze fully plays the absorption effect of ITO and / or ATO on near-infrared light, and through the introduction of Li + and / or Na + with a small ionic radius into the base glaze, the replacement of Sn 4+ in the ITO and / or ATO particles by Si 4+ is accelerated, so that the carriers of ITO and / or ATO mainly exhibit the absorption of near-infrared light after high-temperature firing, so as to realize the heat-absorbing effect of the glaze. The heat-absorbing ceramic glaze greatly expands the application range of the heat-absorbing ceramic tile, and the heat-absorbing effect is more significant than that of only relying on the deep color of the tile body.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of building ceramics, and particularly relates to a heat-absorbing ceramic glaze, a preparation method thereof, and a heat-absorbing ceramic tile. BACKGROUND

[0002] With the large-scale use of building ceramics on buildings in cold regions, the ground, wall surface and the like need to be kept at a suitable temperature for a long time when winter comes. When central heating cannot be effectively carried out in some areas, electric heating methods are applied. However, due to the power limitation, the surface temperature of the ceramic tile cannot be quickly increased, which affects the indoor heat preservation of the ground or wall surface. Therefore, a ceramic tile capable of absorbing heat for a short time to increase the temperature is needed to enhance the indoor heat preservation efficiency.

[0003] Indium tin oxide (ITO) is a substitutional solid solution formed by mixing 90% of In2O3 and 10% of SnO2. Antimony tin oxide (ATO) is formed by mixing 10% of Sb2O3 and 90% of SnO2. Currently, ITO and ATO materials are mainly applied to liquid crystal displays, light-emitting diodes, solar cells and optical coating, and the like, and the transparent and conductive properties thereof are mainly utilized. The conductive performance is realized by the formation of carriers due to the solid solution of Sn 4+ in In2O3 or Sb 5+ in SnO2. Meanwhile, the carriers have a certain absorption function for near-infrared light, and the plasma formed by the carriers and air has a reflection function for near-infrared light. When the reflection function occupies a dominant position, high near-infrared reflectivity is exhibited. Therefore, ITO and ATO nanoparticles are also often used as thermal insulation materials.

[0004] Currently, when ITO and ATO materials are used as thermal insulation materials, nano ITO and ATO particles are generally added to organic paint, which is then coated on a glass substrate to form a thermal insulation coating at a relatively low temperature (200-300°C), so as to realize the thermal insulation effect. However, the structure of ITO and ATO materials is easily corroded under high temperature conditions, which causes abnormal structure and no longer presents the transparent state of ITO and ATO materials. The carriers in the structure are affected, and then the absorption and reflection performance of ITO and ATO materials for near-infrared light is affected, which exhibits optical properties (such as conductive performance and thermal insulation performance) far different from those of ITO and ATO as transparent conductive materials. Therefore, if ITO and ATO materials are directly added to ceramic bodies or glazes for high-temperature sintering, the thermal insulation effect will be greatly reduced, or even no longer exist. In addition, unlike the application of ITO and ATO materials to the surface of glass, which generally adopts the methods of nano-particle coating or magnetron sputtering, vacuum coating and the like, building ceramics mostly adopt the process of micron or submicron powder under high-temperature sintering to realize batch production, which is also quite different from the application of ITO and ATO materials in nanoscale.

[0005] Therefore, how to apply ITO and ATO materials to high-temperature fired building ceramic products needs further research. SUMMARY

[0006] The present application aims to at least solve one of the above technical problems in the prior art. To this end, the present application proposes a heat-absorbing ceramic glaze and a preparation method thereof, and a heat-absorbing ceramic tile, the heat-absorbing ceramic glaze uses ITO and / or ATO as a near-infrared light absorber, and the chemical composition of the base glaze is adjusted accordingly, and the network-breaking ion Li + and / or Na + is used to accelerate the replacement of Si 4+ in the glaze system, and replace Sn 4+ in the ITO and / or ATO particles, thereby giving the glaze good near-infrared light absorption function, and further realizing the heat-absorbing effect of the glaze.

[0007] To solve the above technical problems, the first aspect of the present application provides a heat-absorbing ceramic glaze, the raw material components of which include a base glaze and a heat-absorbing agent, the heat-absorbing agent includes indium tin oxide and / or antimony tin oxide, and the chemical composition of the base glaze contains Li2O and / or Na2O.

[0008] Specifically, at present, tin oxide is often used as an opacifier in ceramic glaze to increase the whiteness of the glaze surface; and because ITO and ATO particles are easily eroded at high temperature during high-temperature firing, thereby reducing the concentration of carriers in ITO and ATO, and further reducing the absorption and reflection functions of near-infrared light. The heat-absorbing ceramic glaze of the present application uses ITO and / or ATO as a heat-absorbing agent, fully utilizes its absorption of near-infrared light, and adjusts the formula of the base glaze to reduce the reflection of near-infrared light by ITO and / or ATO, so as to realize the heat-absorbing effect of the glaze. That is, by introducing Li + and / or Na + with small ionic radius into the base glaze, the replacement of Si 4+ in the glaze system is accelerated, and Sn 4+ in the ITO and / or ATO particles is replaced, so that after high-temperature firing, the carriers of ITO and / or ATO mainly exhibit absorption of near-infrared light, so that the glaze has good heat-absorbing effect.

[0009] As a further improvement of the above scheme, the addition amount of the heat-absorbing agent is 12-30wt% of the base glaze (calculated as dry material). By controlling the amount of the heat-absorbing agent, the heat-absorbing effect of the glaze is maximized under the premise of ensuring the quality of the glaze surface.

[0010] As a further improvement to the above scheme, the chemical composition of the base glaze, by weight percentage, includes: SiO2 46.5-49.5%, Al2O3 14.0-18.0%, Fe2O3 ≤0.3%, TiO2 ≤0.2%, CaO 5.0-9.0%, MgO 3.0-4.5%, BaO 1.8-3.0%, K2O ≤0.5%, Na2O 3.0-6.0%, Li2O 0.3-1.0%, ZrO2 ≤0.7%, ZnO 2.5-4.0%, and a loss on ignition of 6.0-10.0%.

[0011] Specifically, according to the binary phase diagram of SiO2-SnO2, at its eutectic point around 875℃, the mass percentage of SiO2 is approximately 22.62%. As a phase-disconnecting oxide, Li... + Na + The ratio of ionic radius to K + Smaller sizes make it easier to form free Si in the melt. 4 + This accelerates the erosion of SnO2, reduces the interaction between the charge carrier surface of ITO and / or ATO and air, eliminates the plasma generated by this interaction, thereby reducing the reflection of near-infrared light by ITO and / or ATO, resulting in a high near-infrared absorption rate. Therefore, the base glaze of this invention, compared to ordinary ceramic glazes, has a higher K... + The content is relatively lower, while Na + and / or Li + Relatively higher.

[0012] As a further improvement to the above scheme, the raw material composition of the base glaze, by weight, includes: 20.0-25.0 parts of transparent frit, 15.0-20.0 parts of quartz sand, 15.0-20.0 parts of albite, 15.0-20.0 parts of calcined kaolin, 5.0-10.0 parts of alumina, 5.0-8.0 parts of wollastonite, 5.0-7.0 parts of calcined talc, 0.2-0.3 parts of sodium tripolyphosphate, and 0.2-0.3 parts of sodium carboxymethyl cellulose.

[0013] Preferably, the chemical composition of the transparent frit, by weight percentage, includes: SiO2 45.4-49.4%, Al2O3 13.2-17.2%, MgO 3.8-6.0%, CaO 11.3-13.5%, Na2O 3.3-5.4%, Li2O 1.5-3.0%, K2O 0.2-0.4%, BaO 9.4-11.2%, ZnO 2.8-3.9%, P2O5 0.1-0.2%, TiO2 0.04-0.10%, Fe2O3 0.2-0.4%, and a loss on ignition of 0.3-0.8%.

[0014] As a further improvement of the above-mentioned scheme, the particle size of the heat-absorbing agent is 300-500 mesh. Too fine particle size is easy to cause agglomeration, thereby affecting the absorption of ITO and / or ATO to near-infrared light, and further affecting the heat-absorbing performance of the glaze; too coarse particle size is easy to cause uneven glaze surface, and is also not conducive to the absorption of ITO and / or ATO to near-infrared light, thereby leading to the decline of the heat-absorbing performance of the glaze.

[0015] The second aspect of the present application provides a preparation method of a heat-absorbing ceramic glaze, comprising the following steps:

[0016] First, the base glaze is subjected to primary wet ball milling to obtain a base slurry; then the heat-absorbing agent is added to perform secondary wet ball milling to obtain the ceramic glaze.

[0017] As a further improvement of the above-mentioned scheme, the time of the primary wet ball milling is 16-18 hours; and / or, the time of the secondary wet ball milling is 0.5-2 hours.

[0018] Specifically, the ball milling time of ITO and ATO should not be too long, otherwise it will cause damage to the surface structure thereof, accelerate the erosion of Si 4+ , Na 4+ , Li + , etc. in the base glaze to the particles of ITO and ATO, thereby accelerating the high-temperature erosion of the ITO and ATO particles, reducing the concentration of carriers in the ITO or ATO particles, etc., leading to the decline of the heat-absorbing function of the glaze. The ball milling process of the present application, i.e. ball milling the base glaze first and then ball milling the heat-absorbing agent, can effectively prevent the surface structure of ITO and ATO from being damaged due to excessive ball milling, and accelerate the erosion of Si 4+ , Na + , Li + , etc. in the base glaze to the particles of ITO and ATO.

[0019] Preferably, the solid content of the base slurry is 65-70%.

[0020] Preferably, the solid content of the ceramic glaze is 65-75%.

[0021] Preferably, the fineness of the ceramic glaze is 0.1-1.0 wt% of residue on a 325 mesh screen.

[0022] Preferably, the specific gravity of the ceramic glaze is 1.85-1.90 g / cm 3 .

[0023] Preferably, the flow rate of the ceramic glaze is 50-200 seconds (4-cup).

[0024] The third aspect of the present application provides a heat-absorbing ceramic tile, comprising a body and a heat-absorbing glaze layer arranged on the upper surface of the body, wherein the heat-absorbing glaze layer is fired from the above-mentioned ceramic glaze.

[0025] Preferably, the heat-absorbing glaze layer is formed by applying the above-mentioned ceramic glaze by spraying and then firing, and the application amount is 400-600 g / m 2 .

[0026] Preferably, the firing temperature is 1150-1180℃.

[0027] Preferably, the firing period is 58-78 minutes.

[0028] The above technical solutions of the present application have at least the following technical effects or advantages compared with the prior art:

[0029] (1) The present application breaks the conventional application of ITO and ATO as heat-insulating materials at low temperatures (mainly utilizing the plasma reflection function of carriers in ITO and / or ATO with air), and creatively applies them to high-temperature ceramic materials, fully utilizes the absorption of near-infrared light by carriers in ITO and ATO, and realizes the heat-absorbing effect of ceramic glaze.

[0030] (2) The heat-absorbing ceramic glaze of the present application uses ITO and / or ATO as a heat-absorbing agent, fully utilizes its absorption of near-infrared light, and at the same time, adjusts the formula of the base glaze to reduce the reflection of near-infrared light by ITO and / or ATO, i.e. by introducing Li + and / or Na + with a smaller ionic radius into the base glaze, to accelerate the replacement of Sn 4+ in ITO and / or ATO particles by Si 4+ , so that after high-temperature firing, the carriers in ITO and / or ATO mainly exhibit absorption of near-infrared light, to realize the heat-absorbing effect of the glaze.

[0031] (3) In the preparation of the heat-absorbing ceramic glaze of the present application, the ball milling process of ball milling the base glaze first and then ball milling the heat-absorbing agent effectively protects the surface structure of ITO and ATO, and reduces the erosion of Li + , Na + , Si 4+ , etc. in the base glaze to the particles, thereby further ensuring the heat-absorbing effect of the glaze.

[0032] (4) The ceramic glaze of the present application applied to ceramic tiles can endow the ceramic tiles with heat-absorbing function, and since the heat-absorbing effect is mainly determined by the performance of the heat-absorbing agent, rather than the absorption of light by the color (dark color system, such as black) of the tile body, the heat-absorbing ceramic tiles of the present application have no specific requirements for the color of the tile body, and are also applicable to light-colored (such as white) ceramic tiles, thereby greatly expanding the application range of the heat-absorbing ceramic tiles, and the heat-absorbing effect is more significant than relying only on the dark color of the tile body, which can realize rapid heating of the ceramic tiles, improve the utilization of indoor heat efficiency, and reduce the energy consumption for indoor heating. Attached Figure Description

[0033] Figure 1 The images show the reflectance of light at different wavelengths for Example 1 and Comparative Example 1. Detailed Implementation

[0034] The present invention will now be described in detail with reference to embodiments to facilitate understanding of the invention by those skilled in the art. It is particularly important to note that the embodiments are merely illustrative of the invention and should not be construed as limiting the scope of protection of the invention. Non-essential improvements and adjustments made to the invention by those skilled in the art based on the above description should still fall within the scope of protection of the invention. Furthermore, all raw materials mentioned below, unless otherwise specified, are commercially available products; all process steps or preparation methods not mentioned in detail are process steps or preparation methods known to those skilled in the art.

[0035] Example 1

[0036] A heat-absorbing ceramic glaze, the raw material components of which include a base glaze and ATO with a particle size of 500 mesh, wherein the amount of ATO added is 15% of the base glaze (based on dry matter).

[0037] The chemical composition of the base glaze, by weight percentage, includes: SiO2 49.10%, Al2O3 17.70%, Fe2O3 0.17%, TiO2 0.13%, CaO 8.35%, MgO 4.25%, BaO 2.45%, K2O 0.43%, Na2O 4.97%, Li2O 0.33%, ZrO2 0.34%, ZnO 3.36%, and a loss on ignition of 8.42%.

[0038] The raw material composition of the base glaze, by weight, includes: 23.5 parts transparent frit, 19.0 parts quartz sand, 18.5 parts sodium feldspar, 17.5 parts calcined kaolin, 8.0 parts alumina, 7.5 parts wollastonite, 6.0 parts calcined talc, 0.30 parts sodium tripolyphosphate, and 0.25 parts sodium carboxymethyl cellulose.

[0039] The chemical composition of the transparent frit, by weight percentage, includes: SiO2 47.34%, Al2O3 15.22%, MgO 4.79%, CaO 12.34%, Na2O 3.32%, Li2O 1.39%, K2O 0.34%, BaO 10.42%, ZnO 3.79%, P2O5 0.12%, TiO2 0.06%, Fe2O3 0.3%, with a loss on ignition of 0.57%.

[0040] A method for preparing a heat-absorbing ceramic glaze includes the following steps:

[0041] The base glaze is first wet ball milled for 18 hours to obtain a base slurry (solid content 69.0%, fineness of slurry 325 mesh residue 0.69%, specific gravity 1.89 g / cm 3 , flow rate 97 seconds (coating-4 cup)); then ATO is added for secondary wet ball milling for 1 hour to obtain the heat-absorbing ceramic glaze of the present example (solid content 72.0%, fineness of slurry 325 mesh residue 0.38%, specific gravity 1.85 g / cm 3 , flow rate 53 seconds (coating-4 cup)).

[0042] A method for preparing a heat-absorbing ceramic tile, comprising the following steps:

[0043] The heat-absorbing ceramic glaze of the present example is applied to the body by spraying, and the glazing amount is 520 g / m 2 ; then dried at 165°C for 5 minutes; then fired in a kiln, and the maximum firing temperature is 1175°C, and the firing period is 63 minutes to obtain the heat-absorbing ceramic tile of the present example.

[0044] Example 2

[0045] A heat-absorbing ceramic glaze, the raw material components of which include a base glaze and ITO with a particle size of 300 mesh, and the addition amount of ITO is 12% of the base glaze (calculated by dry weight).

[0046] The chemical composition of the base glaze includes, by weight percentage, SiO2 48.54%, Al2O3 17.26%, Fe2O3 0.16%, TiO2 0.14%, CaO 8.73%, MgO 4.13%, BaO 2.47%, K2O 0.39%, Na2O 5.13%, Li2O 0.81%, ZrO2 0.36%, ZnO 3.25%, and loss on ignition 8.63%.

[0047] The raw material composition of the base glaze includes, by weight part, transparent frit 23.7 parts, quartz sand 18.0 parts, sodium feldspar 19.3 parts, calcined kaolin 18.3 parts, alumina 7.5 parts, wollastonite 7.3 parts, burned talc 5.9 parts, sodium tripolyphosphate 0.30 part, and sodium carboxymethyl cellulose 0.30 part.

[0048] The chemical composition of the transparent frit includes, by weight percentage, SiO2 47.63%, Al2O3 15.22%, MgO 4.55%, CaO 11.35%, Na2O 3.54%, Li2O 2.53%, K2O 0.36%, BaO 10.34%, ZnO 3.35%, P2O5 0.13%, TiO2 0.05%, Fe2O3 0.33%, and loss on ignition 0.62%.

[0049] A preparation method of a heat-absorbing ceramic glaze, comprising the following steps:

[0050] Firstly, the base glaze is wet ball-milled for 18 hours to obtain a base slurry (solid content 67.0%, fineness of slurry 325 mesh residue 0.46%, specific gravity 1.89 g / cm 3 , flow rate 98 seconds (coating-4 cups)); then ITO is added for secondary wet ball-milling for 1.5 hours to obtain the heat-absorbing ceramic glaze of the present embodiment (solid content 69.5%, fineness of slurry 325 mesh residue 0.43%, specific gravity 1.85 g / cm 3 , flow rate 55 seconds (coating-4 cups)).

[0051] A preparation method of a heat-absorbing ceramic tile, comprising the following steps:

[0052] The heat-absorbing ceramic glaze of the present embodiment is applied to the body by spraying, and the glazing amount is 515 g / m 2 ; then dried at 155℃ for 10 minutes; then fired in a kiln, and the highest firing temperature is 1170℃, and the firing period is 68 minutes to obtain the heat-absorbing ceramic tile of the present embodiment.

[0053] Embodiment 3

[0054] A heat-absorbing ceramic glaze, wherein the raw material components include a base glaze and ATO with a particle size of 500 mesh and ITO with a particle size of 300 mesh, and the addition amounts of ATO and ITO are 10% and 8% of the base glaze (calculated by dry weight) respectively.

[0055] The chemical composition of the base glaze includes, by weight percentage, SiO2 49.24%, Al2O3 17.36%, Fe2O3 0.19%, TiO2 0.15%, CaO 8.53%, MgO 4.21%, BaO 2.49%, K2O 0.32%, Na2O 4.93%, Li2O 0.75%, ZrO2 0.40%, ZnO 3.05%, and loss on ignition 8.38%.

[0056] The raw material composition of the base glaze includes, by weight, transparent frit 24.0 parts, quartz sand 18.5 parts, sodium feldspar 18.5 parts, calcined kaolin 18.8 parts, alumina 7.0 parts, wollastonite 7.4 parts, burned talc 5.8 parts, sodium tripolyphosphate 0.30 parts, and sodium carboxymethyl cellulose 0.25 parts.

[0057] The chemical composition of the transparent frit includes, in percentage by weight: SiO2 47.33%, Al2O3 15.24%, MgO 4.15%, CaO 11.91%, Na2O 3.64%, Li2O 2.75%, K2O 0.34%, BaO 10.35%, ZnO 3.25%, P2O5 0.10%, TiO2 0.05%, Fe2O3 0.31%, and a loss on ignition of 0.58%.

[0058] A preparation method of a heat-absorbing ceramic glaze, comprising the following steps:

[0059] The base glaze is first wet ball-milled for 18 hours to obtain a base slurry (solid content of 66.5%, fineness of the slurry of 325 mesh residue of 0.47%, and specific gravity of 1.88 g / cm 3 , and flow rate of 105 seconds (Trow-4 cup)); then ATO and ITO are added and wet ball-milled for 1.5 hours to obtain the heat-absorbing ceramic glaze of the embodiment (solid content of 70.0%, fineness of the slurry of 325 mesh residue of 0.42%, and specific gravity of 1.85 g / cm 3 , and flow rate of 53 seconds (Trow-4 cup)).

[0060] A preparation method of a heat-absorbing ceramic tile, comprising the following steps:

[0061] The heat-absorbing ceramic glaze of the embodiment is applied to the body by spraying, and the glazing amount is 518 g / m 2 ; then dried at 160℃ for 8 minutes; and then fired in a kiln, with the highest firing temperature being 1165℃ and the firing period being 75 minutes, to obtain the heat-absorbing ceramic tile of the embodiment.

[0062] Comparative Example 1

[0063] A ceramic glaze, the chemical composition of which includes, in percentage by weight: SiO2 55.98%, Al2O3 28.89%, Fe2O3 0.25%, TiO2 0.28%, CaO 0.77%, MgO 1.21%, SrO 1.38%, K2O 2.73%, Na2O 3.62%, ZrO2 0.88%, ZnO 0.06%, and a loss on ignition of 3.95%.

[0064] The raw material composition includes, in parts by weight: potassium-sodium feldspar 19.5 parts, quartz sand 19.0 parts, sodium feldspar 18.5 parts, calcined kaolin 20.0 parts, aluminum oxide 18.0 parts, calcined talc 3.0 parts, and strontium carbonate 2.0 parts.

[0065] A preparation method of a ceramic glaze, comprising the following steps:

[0066] The raw materials of the ceramic glaze were first prepared and wet ball-milled for 19 hours to obtain the ceramic glaze of the comparative example (solid content 71.0%, fineness of the slurry 325 mesh residue 0.55%, specific gravity 1.90 g / cm 3 , flow rate 106 seconds (coating-4 cup)).

[0067] The ceramic tile of Comparative Example 1 was prepared in the same manner as Example 1.

[0068] Comparative Example 1 differs from Example 1 in that the ceramic glaze of Comparative Example 1 does not contain ATO, and the components of the glaze are different from the base glaze of Example 1. The base glaze of Example 1 has a lower initial melting point, and the glaze layer is transparent without the addition of ATO, which is not conducive to comparison. Therefore, the glaze of Comparative Example 1 is adjusted based on the base glaze of Example 1 to make it opaque.

[0069] Comparative Example 2

[0070] A ceramic glaze, the raw material components of which include a base glaze and ATO with a particle size of 500 mesh, and the addition amount of ATO is 15% of the base glaze (based on dry materials).

[0071] The chemical composition of the base glaze includes, by weight percentage, SiO2 49.57%, Al2O3 15.77%, Fe2O3 0.25%, TiO2 0.28%, CaO 9.27%, MgO 4.12%, BaO 2.21%, K2O 4.73%, Na2O 2.62%, ZrO2 0.88%, ZnO 3.06%, and loss on ignition 7.24%.

[0072] The ceramic glaze and the preparation method of the ceramic tile of Comparative Example 2 are the same as those of Example 1.

[0073] Comparative Example 2 differs from Example 1 in that the chemical composition of the base glaze of Comparative Example 2 is different from that of Example 1. The base glaze of Comparative Example 2 has a higher content of K2O and does not contain Li2O.

[0074] Comparative Example 3

[0075] The raw material components of the ceramic glaze of Comparative Example 3 and the preparation method of the ceramic tile are the same as those of Example 1.

[0076] A preparation method of a ceramic glaze, comprising the following steps:

[0077] The base glaze and the heat absorber were first prepared and wet ball-milled for 19 hours to obtain the ceramic glaze of the comparative example (solid content 70.0%, fineness of the slurry 325 mesh residue 0.38%, specific gravity 1.85 g / cm 3, flow rate of 46 seconds (painted-4 cup).

[0078] The difference between Comparative Example 3 and Example 1 is that the preparation method of the ceramic glaze of Comparative Example 3 adopts a one-step wet ball milling method.

[0079] Comparative Example 4

[0080] The difference between Comparative Example 4 and Comparative Example 1 is only that 10wt% of black pigment is added to the ceramic glaze.

[0081] Performance test

[0082] 1. Light reflection

[0083] The ceramic tile samples prepared in Example 1 and Comparative Example 1 were tested for light reflectivity, and the wavelength of the test light involved ultraviolet light, visible light and near-infrared light, and the test results are shown in Figure 1 .

[0084] As can be seen from Figure 1 , the reflectivity of Example 1 with ATO added is significantly lower than that of Comparative Example 1 without ATO added in the near-infrared range, indicating that the ceramic tile of Example 1 has weaker reflection performance for near-infrared light.

[0085] 2. Heat absorption performance

[0086] The ceramic tile samples prepared in Examples 1-3 and Comparative Examples 1-4 were simultaneously placed under sunlight with an air temperature of 30°C for irradiation, and the surface temperature of the ceramic tile was measured at the irradiation time, and the results are shown in Table 1.

[0087] Table 1: Comparison of surface temperature of ceramic tile of each example and comparative example

[0088]

[0089] As can be seen from Table 1, the surface temperature of the ceramic tile of Examples 1-3 increases significantly with the increase of irradiation time, indicating that it has good heat absorption function.

[0090] The ceramic tiles of Comparative Examples 1-3 have a significantly lower increase in surface temperature than Example 1, indicating that their heat absorption function is not as good as that of Example 1, because the ceramic glaze used does not contain a heat absorber, the composition of the base glaze is different, or a one-step ball milling process is used.

[0091] Comparative Example 4 adds a certain amount of black pigment, which has a certain absorption to light, but far less than the heat absorption effect of Example 1 with a heat absorber added.

[0092] For those skilled in the art of the present application, without departing from the concept of the present application, can make several simple deductions or substitutions, without having to go through the creative labor. Therefore, the simple improvements made by the person skilled in the art according to the disclosure of the present application, should be within the scope of protection of the present application. The above examples are the preferred embodiments of the present application, any similar process and equivalent changes made, should belong to the protection scope of the present application.

Claims

1. A heat absorbing ceramic tile, characterized by, The body and the heat-absorbing glaze layer on the upper surface of the body are fired at a temperature of 1150-1180℃. The raw material components of the heat-absorbing ceramic glaze are composed of a base glaze and a heat-absorbing agent, the heat-absorbing agent includes indium tin oxide and / or antimony tin oxide, and the heat-absorbing agent is added in an amount of 12-30wt% of the base glaze. The chemical composition of the base glaze includes, in terms of weight percentage, SiO2 46.5-49.5%, Al2O3 14.0-18.0%, Fe2O3 ≤0.3%, TiO2 ≤0.2%, CaO 5.0-9.0%, MgO 3.0-4.5%, BaO 1.8-3.0%, K2O ≤0.5%, Na2O 3.0-6.0%, Li2O 0.3-1.0%, ZrO2 ≤0.7%, ZnO 2.5-4.0%, and the loss on ignition is 6.0-10.0%.

2. The heat absorbing ceramic tile according to claim 1, characterized in that, The raw material components of the base glaze include, in terms of weight parts, transparent frit 20.0-25.0 parts, quartz sand 15.0-20.0 parts, sodium feldspar 15.0-20.0 parts, calcined kaolin 15.0-20.0 parts, aluminum oxide 5.0-10.0 parts, wollastonite 5.0-8.0 parts, burned talc 5.0-7.0 parts, sodium tripolyphosphate 0.2-0.3 parts, and sodium carboxymethyl cellulose 0.2-0.3 parts.

3. The heat absorbing ceramic tile according to claim 2, characterized in that, The chemical composition of the transparent frit includes, in terms of weight percentage, SiO2 45.4-49.4%, Al2O3 13.2-17.2%, MgO 3.8-6.0%, CaO 11.3-13.5%, Na2O 3.3-5.4%, Li2O 1.5-3.0%, K2O 0.2-0.4%, BaO 9.4-11.2%, ZnO 2.8-3.9%, P2O5 0.1-0.2%, TiO2 0.04-0.10%, Fe2O3 0.2-0.4%, and the loss on ignition is 0.3-0.8%.

4. The heat absorbing ceramic tile according to claim 1, wherein The particle size of the heat-absorbing agent is 300-500 mesh.

5. The heat absorbing ceramic tile according to any one of claims 1 to 4, characterized in that, The preparation method of the ceramic glaze includes the following steps: First, the base glaze is subjected to primary wet ball milling to obtain a base slurry; then the heat-absorbing agent is added for secondary wet ball milling to obtain the ceramic glaze.

6. The heat absorbing ceramic tile according to claim 5, characterized in that, The time of the primary wet ball milling is 16-18 hours; and / or, the time of the secondary wet ball milling is 0.5-2 hours; and / or, the solid content of the base slurry is 65-70%; and / or, the solid content of the ceramic glaze is 65-75%.

7. The heat absorbing ceramic tile according to claim 5, wherein The firing cycle is 58-78 minutes.

Images