A sunlight-reflecting non-fired coating lightweight ceramic board and its preparation method

Abstract

The present invention belongs to the technical field of building ceramics, and specifically discloses a sunlight-reflecting non-fired coating lightweight ceramic board and a preparation method thereof. The sunlight-reflecting non-fired coating lightweight ceramic board successively comprises a lightweight ceramic substrate, an interface layer, a sunlight-reflecting functional layer and a topcoat layer from bottom to top. The interface layer is cured by a micro-cement interface agent, and the sunlight-reflecting functional layer contains titanium dioxide and micro-cement. The present invention introduces the sunlight-reflecting functional layer in a non-fired manner, eliminating the firing process, effectively avoiding the yellowing phenomenon of titanium dioxide glaze caused by firing, reducing surface quality defects such as pinholes and glaze cracks caused by firing, and realizing the loading of the sunlight-reflecting functional layer on a lightweight ceramic substrate with a low bulk density. The sunlight-reflecting non-fired coating lightweight ceramic board prepared by the present invention has a smooth and flat surface, no obvious surface quality defects, and a direct sunlight reflectance of 88-93%, having good sunlight-reflecting function.

Description

Technical Field

[0001] The present invention belongs to the technical field of building ceramics, and particularly relates to a daylight-reflecting non-fired coating lightweight ceramic board and a preparation method thereof. Background Art

[0002] In daily life, after the surface of urban buildings absorbs solar radiation, the indoor temperature will rise, which not only affects the comfort of the living environment, but also increases the cooling energy consumption of the building. According to statistics, for every 1-degree increase in temperature, the power consumption will increase by about 2%. With the continuous development of society and the improvement of people's comfort requirements for the indoor environment, building energy consumption also shows an upward trend. At present, for the research on building energy conservation, a commonly used and effective method is to attach a layer of "cool material" to the building surface.

[0003] Lightweight ceramic boards, with the characteristics of light weight, energy conservation and environmental protection, can be used as building exterior walls. At present, to attach a functional material with daylight reflection on its surface, mainly by adding TiO 2 or sphene in the glaze, and after TiO 2 or sphene is subjected to high-temperature glaze firing, yellowing will occur, thus affecting the effect of the glaze surface. At the same time, due to the porous characteristics of lightweight ceramics, when glazing is applied on its surface, it is difficult to ensure the quality of the glaze surface, and defects such as pinholes and glaze cracks are likely to occur.

[0004] Therefore, it is urgent to develop a lightweight ceramic board which has good daylight reflection function and better surface quality on the premise of ensuring product quality. Summary of the Invention

[0005] The present invention provides a daylight-reflecting non-fired coating lightweight ceramic board and a preparation method thereof to solve one or more technical problems existing in the prior art, and at least provide a beneficial choice or create conditions.

[0006] To solve the above technical problems, the first aspect of the present invention provides a daylight-reflecting non-fired coating lightweight ceramic board.

[0007] Specifically, a daylight-reflecting non-fired coating lightweight ceramic board comprises, from bottom to top, a lightweight ceramic substrate, an interface layer, a daylight reflection functional layer and a topcoat layer. The interface layer is cured by a microcement interface agent, and the daylight reflection functional layer contains titanium dioxide and microcement.

[0008] To enable the lightweight porous ceramic plate to achieve daylight reflection functionality, the present invention adopts a non-firing process. By sequentially arranging an interface layer, a daylight reflection functional layer, and a cover layer on the surface of the lightweight ceramic substrate, while ensuring the surface quality of the product, good daylight reflection functionality is imparted to the lightweight ceramic plate. Among them: the interface layer is cured by a microcement interface agent, and the microcement interface agent has good bonding properties, which can tightly combine the lightweight ceramic substrate with the daylight reflection functional layer, effectively avoiding the phenomenon of peeling or flaking of the daylight reflection functional layer; the daylight reflection functional layer uses titanium dioxide and microcement as the main raw materials. The microcement is mainly used to fill or cover the pore structure on the surface of the lightweight ceramic plate. At the same time, after the microcement dries, it has a relatively high bonding strength, which can make the titanium dioxide firmly adhere to the surface of the lightweight ceramic substrate and endow the lightweight ceramic plate with good daylight reflection functionality; at the same time, since the titanium dioxide is not fired at high temperature, defects such as yellowing and pinhole glaze cracking will not occur, which is beneficial to improving the surface quality of the lightweight ceramic plate. In addition, a cover layer is provided on the surface of the daylight reflection functional layer, which is mainly used to prevent defects such as damage and scratches of the daylight reflection functional layer under external forces.

[0009] As a further improvement of the above solution, the bulk density of the lightweight ceramic substrate is 0.3 - 1.8 g / cm 3 . The bulk density of the lightweight ceramic substrate of the present invention is lower than that of ordinary ceramics (the bulk density is 2.2 - 2.5 g / cm 3 ), and its surface and interior both have a uniform pore structure, which also poses a challenge to the combination between the daylight reflection functional material and the lightweight ceramic substrate. The present invention effectively solves the filling of the lightweight ceramic substrate and its combination with the daylight reflection functional material by arranging an interface layer and mixing the daylight reflection functional material with microcement.

[0010] As a further improvement of the above solution, the mass ratio of the titanium dioxide to the microcement is (1 - 3):6. The specific ratio of titanium dioxide to microcement can better exert the daylight reflection function of titanium dioxide on the premise of ensuring the pore filling and bonding strength of the microcement.

[0011] As a further improvement of the above solution, the titanium dioxide contains three particle sizes of 400 mesh, 800 mesh, and 1200 mesh, and the mass ratio of the 400-mesh, 800-mesh, and 1200-mesh particle sizes is (3 - 5):(2 - 3):1.

[0012] Specifically, the present invention uses titanium dioxide with different particle sizes, which can form a graded packing between particles with the microcement, making the surface of the coated lightweight ceramic plate smoother and flatter.

[0013] As a further improvement of the above solution, the average particle size of the microcement is 100 - 800 mesh.

[0014] Specifically, when the bulk density of the lightweight ceramic substrate is relatively large (such as 1.5 - 1.8 g / cm 3 ), if the microcement particles are too coarse, the leveling effect on the board surface during brushing will be poor, and a smooth and flat surface cannot be achieved. By selecting microcement with a suitable particle size, it can form a graded packing with titanium dioxide particles, thereby obtaining a smooth and flat surface, reducing the light diffuse reflection caused by surface roughness, and thus affecting the daylight reflection function of the lightweight ceramic board.

[0015] As a further improvement of the above solution, the topcoat layer is cured from a topcoat paint, and the topcoat paint is selected from fluorocarbon topcoat paint or polyurethane topcoat paint. Both fluorocarbon topcoat paint and polyurethane topcoat paint have good anti-aging properties, which is beneficial to improving the service life of the product and can meet the requirements of outdoor application scenarios.

[0016] As a further improvement of the above solution, the brushing thickness of the microcement interface agent is 50 - 150 g / m 2 ; the thickness of the daylight reflection function layer is 0.5 - 2 mm; the spraying amount of the topcoat paint is 50 - 100 g / m 2 .

[0017] Specifically, the present invention controls the usage amount of the raw materials of each structural layer to control the thickness of each structural layer, thereby achieving the best bonding strength, surface quality, and daylight reflection function. If the proportion of the usage amount of the raw materials of each structural layer is improper, the phenomenon of interlayer peeling or delamination will occur.

[0018] The second aspect of the present invention provides a preparation method of a daylight reflection non-fired coated lightweight ceramic board.

[0019] Specifically, a preparation method of a daylight reflection non-fired coated lightweight ceramic board, the preparation method is used to prepare the daylight reflection non-fired coated lightweight ceramic board described in the first aspect of the present invention, and includes the following steps:

[0020] (1) Brush the microcement interface agent on the surface of the lightweight ceramic substrate, dry and cure it to obtain a lightweight ceramic board with an interface layer;

[0021] (2) Modulate titanium dioxide and microcement into a mixed slurry, and then brush it on the surface of the lightweight ceramic board with an interface layer, dry and cure it to obtain a lightweight ceramic board with a daylight reflection function layer;

[0022] (3) Spray the topcoat paint on the surface of the lightweight ceramic board with a daylight reflection function layer, and after drying and curing, obtain the daylight reflection non-fired coated lightweight ceramic board.

[0023] Preferably, in steps (1) to (3), the temperature of the drying and curing is 50 - 70 °C.

[0024] The third aspect of the present invention provides the application of the sunlight-reflecting non-fired coating lightweight ceramic board described in the first aspect of the present invention in the field of architectural decoration.

[0025] Preferably, the application of the sunlight-reflecting non-fired coating lightweight ceramic board in an outdoor curtain wall.

[0026] The above technical solution of the present invention has at least the following technical effects or advantages compared with the prior art:

[0027] (1) In the sunlight-reflecting non-fired coating lightweight ceramic board of the present invention, an interface layer, a sunlight-reflecting functional layer, and a topcoat are sequentially arranged on the surface of the lightweight ceramic substrate. The interface layer is cured by a micro-cement interface agent and can tightly bond the lightweight ceramic substrate and the sunlight-reflecting functional layer. The sunlight-reflecting functional layer uses titanium dioxide and micro-cement as the main raw materials. The micro-cement is mainly used to fill or cover the pore structure on the surface of the lightweight ceramic board, and at the same time can make the titanium dioxide firmly adhere to the surface of the lightweight ceramic substrate, endowing the lightweight ceramic board with good sunlight-reflecting function. The topcoat is mainly used to prevent defects such as breakage and scratches of the sunlight-reflecting functional layer under external forces.

[0028] (2) Compared with the prior art in which a titanium dioxide glaze with sunlight-reflecting function is introduced on the lightweight ceramic board by a firing method, it is difficult to overcome the glaze quality defects and the phenomenon of glaze yellowing caused by firing, and for lightweight ceramic substrates with a low bulk density (0.3 - 1.0 g / cm 3 ), it is more difficult to introduce a sunlight-reflecting functional glaze layer due to the too large surface pore diameter. However, the present invention uses a non-fired method to introduce the sunlight-reflecting functional layer, eliminating the firing process, effectively avoiding the yellowing phenomenon of the titanium dioxide glaze caused by firing, and at the same time reducing surface quality defects such as pinholes and glaze cracks caused by firing, realizing the loading of the sunlight-reflecting functional layer on the lightweight ceramic substrate with a low bulk density. In addition, by using the non-fired process, the energy consumption is greatly reduced, providing a low-cost green development path for the decorative processing of lightweight ceramic boards.

[0029] (3) The sunlight-reflecting non-fired coating lightweight ceramic board prepared by the present invention has a relatively smooth and flat surface, no obvious surface quality defects, and the direct solar reflectance is 88 - 93%, having good sunlight-reflecting function. Detailed implementation manners

[0030] The present invention will be specifically described below in conjunction with embodiments to facilitate the understanding of those skilled in the art. It is necessary to specifically point out here that the embodiments are only used to further illustrate the present invention and should not be construed as limiting the protection scope of the present invention. Those skilled in the art, based on the above-mentioned invention content, make non-essential improvements and adjustments to the present invention, which should still fall within the protection scope of the present invention. At the same time, for the raw materials not specifically described below, they are all commercially available products; the process steps or preparation methods not specifically mentioned are all process steps or preparation methods well-known to those skilled in the art.

[0031] The raw materials used in the following examples and comparative examples are as follows:

[0032] Microcement primer: The microcement primer of Ruishi Environmental Protection Technology Co., Ltd.;

[0033] Fluorocarbon topcoat: The fluorocarbon topcoat of Dongguan Yuanyuansheng Technology Co., Ltd.;

[0034] Polyurethane topcoat: The polyurethane topcoat of Guangdong Meitoushi Building Materials Co., Ltd.

[0035] Example 1

[0036] A daylight-reflecting non-fired coated lightweight ceramic board, which sequentially includes a lightweight ceramic substrate from bottom to top, an interface layer cured by a microcement primer, a daylight-reflecting functional layer containing titanium dioxide and microcement, and a topcoat layer cured by a fluorocarbon topcoat. Among them: the bulk density of the lightweight ceramic substrate is 0.5 g / cm 3 , the mass ratio of titanium dioxide with particle sizes of 400 mesh, 800 mesh, and 1200 mesh is 5:2:1, the mass ratio of titanium dioxide to microcement is 2:6, and the average particle size of microcement is 100 - 800 mesh; the coating amount of the microcement primer is 50 g / m 2 , and the thickness of the daylight-reflecting functional layer is 2 mm.

[0037] A preparation method of a daylight-reflecting non-fired coated lightweight ceramic board includes the following steps:

[0038] (1) Apply a microcement primer on the surface of the lightweight ceramic substrate (the mixing mass ratio of the microcement primer to water is 7:3), and dry and cure at 60 °C for 2 hours to obtain a lightweight ceramic board with an interface layer;

[0039] (2) Prepare a mixed slurry of titanium dioxide and microcement, and then apply it on the surface of the lightweight ceramic board with an interface layer obtained in step (1), and dry and cure at 60 °C for 2 hours to obtain a lightweight ceramic board with a daylight-reflecting functional layer;

[0040] (3) Spray a topcoat on the lightweight ceramic board with a daylight-reflecting functional layer obtained in step (2), and the spraying amount is 50 g / m2 It was dried and cured at 65 °C for 8 hours to obtain the daylight-reflective non-fired coating lightweight ceramic board of this example.

[0041] Example 2

[0042] A daylight-reflective non-fired coating lightweight ceramic board successively includes a lightweight ceramic substrate from bottom to top, an interface layer cured by a microcement interface agent, a daylight-reflective functional layer containing titanium dioxide and microcement, and a topcoat layer cured by a polyurethane topcoat. Among them: the bulk density of the lightweight ceramic substrate is 1.0 g / cm 3 , the mass ratio of the particle sizes of 400 mesh, 800 mesh and 1200 mesh in titanium dioxide is 4:3:1, the mass ratio of titanium dioxide to microcement is 2:6, and the average particle size of microcement is 100 - 800 mesh; the coating amount of the microcement interface agent is 50 g / m 2 , and the thickness of the daylight-reflective functional layer is 1 mm.

[0043] A preparation method of a daylight-reflective non-fired coating lightweight ceramic board includes the following steps:

[0044] (1) A microcement interface agent (the mixing mass ratio of the microcement interface agent to water is 7:3) was brushed on the surface of the lightweight ceramic substrate and dried and cured at 60 °C for 2 hours to obtain a lightweight ceramic board with an interface layer;

[0045] (2) Titanium dioxide and microcement were made into a mixed slurry, and then it was brushed on the surface of the lightweight ceramic board with an interface layer prepared in step (1) and dried and cured at 55 °C for 3 hours to obtain a lightweight ceramic board with a daylight-reflective functional layer;

[0046] (3) A topcoat was sprayed on the lightweight ceramic board with a daylight-reflective functional layer prepared in step (2), and the spraying amount was 50 g / m 2 , and it was dried and cured at 65 °C for 8 hours to obtain the daylight-reflective non-fired coating lightweight ceramic board of this example.

[0047] Example 3

[0048] A daylight-reflective non-fired coating lightweight ceramic board successively includes a lightweight ceramic substrate from bottom to top, an interface layer cured by a microcement interface agent, a daylight-reflective functional layer containing titanium dioxide and microcement, and a topcoat layer cured by a fluorocarbon topcoat. Among them: the bulk density of the lightweight ceramic substrate is 1.0 g / cm 3 , the mass ratio of the particle sizes of 400 mesh, 800 mesh and 1200 mesh in titanium dioxide is 3:3:1, the mass ratio of titanium dioxide to microcement is 3:6, and the average particle size of microcement is 100 - 800 mesh; the coating amount of the microcement interface agent is 100 g / m 2 , and the thickness of the daylight-reflective functional layer is 2 mm.

[0049] A preparation method of a daylight - reflecting non - fired coated lightweight ceramic board, comprising the following steps:

[0050] (1) Brush a micro - cement interface agent on the surface of the lightweight ceramic substrate (the mixing mass ratio of the micro - cement interface agent to water is 8:2), and dry and cure at 55 °C for 3 hours to obtain a lightweight ceramic board with an interface layer;

[0051] (2) Prepare a mixed slurry of titanium dioxide and micro - cement, and then brush it on the surface of the lightweight ceramic board with an interface layer obtained in step (1), and dry and cure at 65 °C for 3 hours to obtain a lightweight ceramic board with a daylight - reflecting functional layer;

[0052] (3) Spray a topcoat on the lightweight ceramic board with a daylight - reflecting functional layer obtained in step (2), the spraying amount is 100 g / m 2 , and dry and cure at 70 °C for 7 hours to obtain the daylight - reflecting non - fired coated lightweight ceramic board of this embodiment.

[0053] Example 4

[0054] A daylight - reflecting non - fired coated lightweight ceramic board, which sequentially comprises a lightweight ceramic substrate, an interface layer cured by a micro - cement interface agent, a daylight - reflecting functional layer containing titanium dioxide and micro - cement, and a topcoat layer cured by a fluorocarbon topcoat from bottom to top. Among them: the bulk density of the lightweight ceramic substrate is 1.0 g / cm 3 , the mass ratio of the particle sizes of 400 - mesh, 800 - mesh and 1200 - mesh in titanium dioxide is 3:2:1, the mass ratio of titanium dioxide to micro - cement is 2:6, and the average particle size of micro - cement is 100 - 800 mesh; the brushing amount of the micro - cement interface agent is 150 g / m 2 , and the thickness of the daylight - reflecting functional layer is 1 mm.

[0055] A preparation method of a daylight - reflecting non - fired coated lightweight ceramic board, comprising the following steps:

[0056] (1) Brush a micro - cement interface agent on the surface of the lightweight ceramic substrate (the mixing mass ratio of the micro - cement interface agent to water is 8:2), and dry and cure at 65 °C for 2 hours to obtain a lightweight ceramic board with an interface layer;

[0057] (2) Prepare a mixed slurry of titanium dioxide and micro - cement, and then brush it on the surface of the lightweight ceramic board with an interface layer obtained in step (1), and dry and cure at 60 °C for 3 hours to obtain a lightweight ceramic board with a daylight - reflecting functional layer;

[0058] (3) Spray a topcoat on the lightweight ceramic board with a daylight - reflecting functional layer obtained in step (2), the spraying amount is 100 g / m 2 , and dry and cure at 60 °C for 8 hours to obtain the daylight - reflecting non - fired coated lightweight ceramic board of this embodiment.

[0059] Comparative Example 1

[0060] A sunlight - reflecting non - fired coated lightweight ceramic board, which successively includes a lightweight ceramic substrate from bottom to top, an interface layer cured by a micro - cement interface agent, a sunlight - reflecting functional layer containing titanium dioxide and micro - cement, and a topcoat layer cured by fluorocarbon topcoat paint. Among them: the bulk density of the lightweight ceramic substrate is 0.5 g / cm 3 , the particle size of titanium dioxide is 800 mesh, the mass ratio of titanium dioxide to micro - cement is 2:6, and the average particle size of micro - cement is 100 - 800 mesh; the coating amount of the micro - cement interface agent is 50 g / m 2 , and the thickness of the sunlight - reflecting functional layer is 2 mm.

[0061] A preparation method of a sunlight - reflecting non - fired coated lightweight ceramic board includes the following steps:

[0062] (1) Brush the micro - cement interface agent on the surface of the lightweight ceramic substrate (the mixing mass ratio of the micro - cement interface agent to water is 7:3), and dry - cure at 60 °C for 2 hours to obtain a lightweight ceramic board with an interface layer;

[0063] (2) Prepare a mixed slurry of titanium dioxide and micro - cement, and then brush it on the surface of the lightweight ceramic board with an interface layer obtained in step (1), and dry - cure at 60 °C for 2 hours to obtain a lightweight ceramic board with a sunlight - reflecting functional layer;

[0064] (3) Spray the topcoat paint on the lightweight ceramic board with a sunlight - reflecting functional layer obtained in step (2), the spraying amount is 50 g / m 2 , and dry - cure at 65 °C for 8 hours to obtain the sunlight - reflecting non - fired coated lightweight ceramic board of this comparative example.

[0065] Comparative Example 2

[0066] A sunlight - reflecting non - fired coated lightweight ceramic board, which successively includes a lightweight ceramic substrate from bottom to top, a sunlight - reflecting functional layer containing titanium dioxide and micro - cement, and a topcoat layer cured by fluorocarbon topcoat paint. Among them: the bulk density of the lightweight ceramic substrate is 0.5 g / cm 3 , the mass ratio of titanium dioxide with particle sizes of 400 mesh, 800 mesh, and 1200 mesh is 5:2:1, the mass ratio of titanium dioxide to micro - cement is 2:6, and the average particle size of micro - cement is 100 - 800 mesh; the thickness of the sunlight - reflecting functional layer is 2 mm.

[0067] A preparation method of a sunlight - reflecting non - fired coated lightweight ceramic board includes the following steps:

[0068] (1) Prepare a mixed slurry by mixing titanium dioxide and microcement, and then apply it to the surface of a lightweight ceramic substrate. Dry and cure it at 60 °C for 2 hours to obtain a lightweight ceramic board with a daylight reflection functional layer;

[0069] (2) Spray a topcoat on the lightweight ceramic board with a daylight reflection functional layer prepared in step (1). The spraying amount is 50 g / m 2 , and dry and cure it at 65 °C for 8 hours to obtain the daylight reflection non-fired coated lightweight ceramic board of this comparative example.

[0070] Performance Test

[0071] Respectively conduct daylight reflection performance tests on the daylight reflection non-fired coated lightweight ceramic board samples prepared in Examples 1-4 and Comparative Examples 1-2, measure their daylight reflectance, and observe the surface quality of the lightweight ceramic boards. Among them: The daylight reflectance is tested using an ultraviolet-near infrared-daylight spectrophotometer (LAMBDA950, PE Company, USA). The wavenumber range provided by the instrument is 300-2500 nm, and the resolution is 5 nm. The test results are shown in Table 1.

[0072] Table 1: Performance comparison table of lightweight ceramic board samples prepared in Examples 1-4 and Comparative Examples 1-3

[0073]

[0074]

[0075] As can be seen from Table 1, the lightweight ceramic board samples prepared in Examples 1-4 all have good daylight reflection functions, and the surfaces are smooth without obvious defects. The difference between Comparative Example 2 and Example 1 is only that in Comparative Example 2, the titanium dioxide has a single particle size and the surface of the lightweight ceramic board is relatively rough. The difference between Comparative Example 3 and Example 1 is only that the lightweight ceramic board in Comparative Example 3 does not contain a microcement interface agent, and obvious layered peeling phenomena appear at the edges of the lightweight ceramic board.

[0076] For those of ordinary skill in the art to which the present invention pertains, without departing from the concept of the present invention, several simple deductions or substitutions can be made without creative labor. Therefore, simple improvements made by those skilled in the art based on the disclosure of the present invention should fall within the protection scope of the present invention. The above embodiments are the preferred embodiments of the present invention, and all processes similar to the present invention and equivalent changes made should fall within the protection scope of the present invention.

Claims

1. A light ceramic board with a sunlight-reflecting and non-fired coating, characterized in that, it successively includes a light ceramic substrate, an interface layer, a sunlight-reflecting functional layer and a topcoat layer from bottom to top. The interface layer is cured by a micro-cement interface agent, and the sunlight-reflecting functional layer contains titanium dioxide and micro-cement; The bulk density of the lightweight ceramic substrate is 0.3-1.8 g / cm 3 ; the mass ratio of the titanium dioxide to the micro-cement is (1 - 3):6; the titanium dioxide includes three particle sizes of 400 mesh, 800 mesh and 1200 mesh, and the mass ratio of the 400-mesh, 800-mesh and 1200-mesh particle sizes is (3 - 5):(2 - 3):1; the average particle size of the micro-cement is 100 - 800 mesh.

2. The light ceramic board with a sunlight-reflecting and non-fired coating according to claim 1, characterized in that, the topcoat layer is cured by a topcoat paint, and the topcoat paint is selected from fluorocarbon topcoat paint or polyurethane topcoat paint.

3. The light ceramic board with a sunlight-reflecting and non-fired coating according to claim 2, characterized in that, The brushing thickness of the microcement interface agent is 50 - 150 g / m 2 ; the thickness of the daylight reflection functional layer is 0.5 - 2 mm; the spraying amount of the topcoat is 50 - 100 g / m 2 .

4. A preparation method of a light ceramic board with a sunlight-reflecting and non-fired coating, characterized in that, the preparation method is used to prepare the light ceramic board with a sunlight-reflecting and non-fired coating according to any one of claims 1 to 3, and includes the following steps: (1) Brush the micro-cement interface agent on the surface of the light ceramic substrate, dry and cure it to obtain a light ceramic board with an interface layer; (2) Modulate titanium dioxide and micro-cement into a mixed slurry, and then brush it on the surface of the light ceramic board with the interface layer, dry and cure it to obtain a light ceramic board with a sunlight-reflecting functional layer; (3) Spray the topcoat paint on the surface of the light ceramic board with the sunlight-reflecting functional layer, and after drying and curing, obtain the light ceramic board with a sunlight-reflecting and non-fired coating.

5. The preparation method of a light ceramic board with a sunlight-reflecting and non-fired coating according to claim 4, characterized in that, in steps (1) to (3), the temperature of the drying and curing is 50 - 70 °C.

6. Application of the light ceramic board with a sunlight-reflecting and non-fired coating according to any one of claims 1 to 3 in the field of building decoration.

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