Light wallboard with radiation cooling and high thermal resistance and preparation method thereof

Abstract

The invention relates to the technical field of building materials, in particular to a light wallboard with radiation cooling and high thermal resistance and a preparation method of the light wallboard. The light wallboard with radiation cooling and high thermal resistance comprises the following components in parts by weight: 600 parts of water glass, 380-420 parts of condensed aluminum phosphate, 40-50 parts of hydrogen peroxide, 20-30 parts of a foam stabilizer, 30-40 parts of a radiation cooling material and 45-55 parts of hydroxyl silicone oil, the foam stabilizer comprises at least one of calcium stearate, silicone amide and polyvinyl alcohol; the radiation cooling material comprises at least one of barium sulfate, nano silicon dioxide, titanium dioxide, calcium carbonate and aluminum oxide. The water glass and the condensed aluminum phosphate can cooperate to provide a strong thermal isolation effect, and the influence of external high temperature on the indoor environment can be remarkably reduced; and the radiation cooling material can adjust the temperature of the wallboard and reduce heat accumulation, so that the indoor environment is more comfortable.

Description

Technical Field

[0001] This application relates to the technical field of building materials, and particularly relates to a lightweight wall panel with radiative cooling and high thermal resistance and a preparation method thereof. Background Art

[0002] With the continuous improvement of the building industry's requirements for energy efficiency and environmental protection, building energy-saving technologies have gradually become the core direction of building design and material research and development. As the main isolation layer between the building exterior and the interior environment, the wall directly affects the thermal performance of the building. Most of the existing building wall materials focus on reducing heat conduction through heat insulation and thermal insulation, thereby improving the energy efficiency of buildings.

[0003] With the increase in high-temperature weather in summer, walls that rely solely on thermal insulation materials often face the problem of heat accumulation, resulting in too high indoor temperatures, affecting indoor comfort, and increasing the load on air conditioners and refrigeration. Summary of the Invention

[0004] In order to solve the problem that the existing walls are prone to heat accumulation problems in high-temperature weather, affecting indoor comfort and increasing the load on air conditioners and refrigeration. This application provides a lightweight wall panel with radiative cooling and high thermal resistance. Through the mutual cooperation among sodium silicate, condensed aluminum phosphate, and radiative cooling materials, this wall panel can well improve the heat accumulation problem of the wall panel.

[0005] In the first aspect, this application provides a lightweight wall panel with radiative cooling and high thermal resistance, adopting the following technical solution: A lightweight wall panel with radiative cooling and high thermal resistance, comprising the following components in parts by weight: 600 parts of sodium silicate, 380 - 400 parts of condensed aluminum phosphate, 40 - 45 parts of hydrogen peroxide, 20 - 25 parts of foam stabilizer, 30 - 35 parts of radiative cooling material, 45 - 50 parts of hydroxy silicone oil; The foam stabilizer includes at least one of calcium stearate, silicone amide, and polyvinyl alcohol; The radiative cooling material includes at least one of barium sulfate, nano-silica, titanium dioxide, calcium carbonate, and aluminum oxide.

[0006] By adopting the above technical solution, sodium silicate (aqueous solution of sodium silicate) has good adhesiveness and heat resistance, and can form a stable structure in the wall panel, helping to isolate the transfer of heat. Condensed aluminum phosphate is an inorganic material with excellent high-temperature resistance and thermal stability. It can form a dense heat insulation layer in the wall panel, effectively reducing the penetration of heat. The combination of these two components provides a strong heat isolation effect for the wall panel, and can significantly reduce the impact of external high temperature on the indoor environment.

[0007] Radiative cooling materials include barium sulfate, nano-silica, titanium dioxide, calcium carbonate, aluminum oxide, etc. These materials have good radiative heat dissipation performance and can dissipate the heat absorbed by the wall panel into the atmosphere in a radiative manner, thereby reducing the temperature of the wall panel. Especially in high-temperature weather, the role of radiative cooling materials is particularly significant. They can regulate the temperature of the wall panel, reduce the accumulation of heat, and make the indoor environment more comfortable.

[0008] In this application, sodium silicate and condensed aluminum phosphate can cooperate to provide a strong thermal insulation effect, which can significantly reduce the impact of external high temperature on the indoor environment; radiative cooling materials can regulate the temperature of the wall panel, reduce the accumulation of heat, and make the indoor environment more comfortable; through the mutual cooperation among sodium silicate, condensed aluminum phosphate and radiative cooling materials, the heat accumulation problem of the wall panel can be well improved.

[0009] Preferably, the foam stabilizer is calcium stearate.

[0010] By adopting the above technical solution, hydrogen peroxide releases oxygen during decomposition to form a uniform and stable bubble structure, and these bubbles are crucial for reducing the density of the material, enhancing the lightness and thermal insulation. Calcium stearate, through its unique chemical properties, effectively prevents the foam from breaking or collapsing during the formation and curing process, ensuring that the wall panel remains lightweight and has a uniform structure.

[0011] The stability of the foam structure directly affects the lightness and thermal insulation of the wall panel. By stabilizing the foam, calcium stearate enables the wall panel to still have excellent heat insulation performance while maintaining a low density. This is of great significance for reducing heat transfer and improving the comfort of the indoor environment.

[0012] Condensed water is likely to be generated at the cooling wall surface of the radiative cooling material, which may have an adverse impact on the performance of the wall panel. However, calcium stearate can reduce the leakage problem caused by poor bonding at the interface by enhancing the interfacial bonding force. Calcium stearate reduces the possibility of moisture penetration, thereby extending the service life of the wall panel and maintaining its good heat insulation performance.

[0013] Compared with silicone amide and polyvinyl alcohol, calcium stearate can not only improve the stability of the bubbles, but also improve the impermeability of the wall panel, with better comprehensive performance.

[0014] Preferably, the radiative cooling material is nano-silica.

[0015] By adopting the above technical solution, the particle size of nano-silica is very small, which gives it a very large specific surface area. A high specific surface area means that there are a large number of active sites on the surface of nano-silica particles. These sites can form stronger interactions with other materials, so as to disperse more evenly in the wallboard. Due to its small particle size and large specific surface area, nano-silica has a high surface activity. This high activity enables nano-silica to be more easily mixed evenly with other components in the wallboard material, avoiding the occurrence of agglomeration phenomena. At the same time, good dispersibility ensures that nano-silica can form a continuous network structure inside the wallboard, which helps to improve the overall performance of the wallboard.

[0016] The main function of the radiative cooling material is to regulate the temperature of the wallboard and reduce the accumulation of heat. Due to its uniform dispersibility and high activity, nano-silica can absorb and radiate heat more effectively in the wallboard. When the external temperature rises, nano-silica can quickly dissipate the heat to the atmosphere in the form of radiation, thereby reducing the temperature of the wallboard. This efficient heat transfer mechanism makes nano-silica perform excellently in improving the temperature regulation ability of the wallboard.

[0017] Compared with traditional radiative cooling materials such as barium sulfate, calcium carbonate, and aluminum oxide, nano-silica can be more evenly dispersed in the wallboard and form a denser radiative cooling network due to its small particle size, large specific surface area, high surface activity, and high dispersibility. This helps to improve the overall thermal radiation efficiency of the wallboard, thereby enhancing its temperature regulation ability.

[0018] Preferably, the radiative cooling material is a radiative cooling mixture of nano-silica and barium sulfate, and the mass ratio of nano-silica to barium sulfate in the radiative cooling mixture is 1:0.7 - 1.2.

[0019] By adopting the above technical solution, due to its high electron bandgap, barium sulfate can effectively reduce the absorption of sunlight. At the same time, its phonon resonance wavelength matches the atmospheric window, resulting in a high emissivity in the atmospheric window band. These properties make barium sulfate an efficient radiative cooling material. However, too much barium sulfate is prone to agglomeration. The agglomerated barium sulfate particles will form hot spots, reducing the overall radiative cooling performance of the wallboard. When nano-silica and barium sulfate are mixed, the dispersibility of nano-silica can be fully exerted, and due to a small amount of barium sulfate, the agglomeration effect is not obvious. The combination of the two results in better radiative cooling performance.

[0020] When the content of barium sulfate is too low, the improvement of the radiative cooling performance of the wallboard is not obvious. When the content of barium sulfate is too high, too much barium sulfate is also prone to agglomeration, which instead reduces the radiative cooling performance of the wallboard. Therefore, the mass ratio of nano-silica to barium sulfate is preferably as above.

[0021] Preferably, the foam stabilizer is a foam-stabilizing mixture A of calcium stearate and silicone amide.

[0022] By adopting the above technical solution, silicone amide has a special dendritic three-dimensional spatial structure, which endows it with unique physical and chemical properties. The dendritic structure enables silicone amide molecules to form complex networks in the material, and these networks can effectively stabilize the bubble structure and prevent the bubbles from bursting or collapsing during the preparation and curing processes. Silicone amide can not only stabilize the bubbles but also interact with other components in wallboard materials such as condensed aluminum phosphate and sodium silicate. This interaction helps to form a more stable network structure, which plays a role in enhancing the overall stability inside the wallboard.

[0023] As a traditional foam stabilizer, calcium stearate also has good bubble-stabilizing performance. When it is used in combination with silicone amide, the two can jointly improve the stability of the material from different aspects. At the same time, calcium stearate can also improve the impermeability of the wallboard.

[0024] Preferably, in the foam-stabilizing mixture A, the mass ratio of calcium stearate to silicone amide is 1:0.5 - 1.

[0025] By adopting the above technical solution, silicone amide plays a key role in the foam stabilizer, and its special dendritic three-dimensional spatial structure helps to stabilize the bubble structure. If the content of silicone amide is too low, it may not be able to form a sufficient number of stable network structures to effectively support the bubbles. Silicone amide can not only stabilize the bubbles but also interact with other components (such as condensed aluminum phosphate and sodium silicate) in the wallboard material to form a more stable overall structure. An overly low content of silicone amide may not be able to fully interact with other components, thus reducing the overall stability of the material.

[0026] When the content of silicone amide is too high, the content of calcium stearate is relatively reduced, and then the impermeability of the wallboard will drop significantly. Therefore, the above mass ratio of calcium stearate to silicone amide is appropriate.

[0027] Preferably, the foam stabilizer is a foam-stabilizing mixture B of calcium stearate, silicone amide and polyvinyl alcohol.

[0028] By adopting the above technical solutions, polyvinyl alcohol plays multiple roles in the foam stabilizer mixture B. First of all, it can form hydrogen bonds and other interactions with other components in the material, and these interactions enhance the structural stability of the bubbles and the overall wallboard. The formation of hydrogen bonds increases the intermolecular forces in the material, making it more difficult for the wallboard to be damaged when subjected to external forces. Secondly, polyvinyl alcohol may also fill the tiny pores and cracks in the material, and these pores and cracks are often the channels for water penetration. By filling these channels, polyvinyl alcohol improves the water resistance of the wallboard, enabling the wallboard to still maintain excellent performance in a humid environment.

[0029] When calcium stearate, silicone amide and polyvinyl alcohol are used in combination, they can jointly improve the structural stability and water resistance of the wallboard from different aspects. Calcium stearate stabilizes the bubble structure, silicone amide forms a complex network structure and enhances the interaction with other components, while polyvinyl alcohol further enhances the structural stability and water resistance by forming hydrogen bonds and filling tiny pores. This synergistic effect enables the wallboard material to maintain a more uniform and stable bubble structure during the preparation and curing processes, while improving the overall strength and water resistance of the material.

[0030] Preferably, the mass ratio of calcium stearate, silicone amide and polyvinyl alcohol in the foam stabilizer mixture B is 1:(0.6 - 0.8):(0.4 - 0.6).

[0031] By adopting the above technical solutions, calcium stearate, silicone amide and polyvinyl alcohol in the above ratio endow the material with a more stable structure and water resistance.

[0032] Preferably, the radiation cooling material is barium sulfate.

[0033] By adopting the above technical solutions, barium sulfate, as an efficient radiation cooling material, has broad application potential in building materials such as lightweight wallboards. However, excessive barium sulfate particles are prone to agglomeration, which not only reduces its radiation cooling performance but may also affect the overall performance and uniformity of the wallboard. When barium sulfate is used in combination with the foam stabilizer mixture B, the polyvinyl alcohol component in the foam stabilizer mixture B can effectively solve this problem.

[0034] Polyvinyl alcohol is a high molecular compound with good adsorption and film-forming properties. In the foam stabilizer mixture B, polyvinyl alcohol can adsorb on the surface of barium sulfate particles to form a thin coating layer. This coating layer not only increases the steric hindrance between barium sulfate particles but also effectively reduces the interaction force between the particles, thus preventing particle agglomeration.

[0035] When barium sulfate particles are difficult to agglomerate, they can more fully exhibit their excellent radiative cooling performance. The high electron bandgap of barium sulfate enables it to effectively reduce the absorption of sunlight, while the matching of its phonon resonance wavelength with the atmospheric window results in a high emissivity in the atmospheric window band. These properties make barium sulfate an ideal radiative cooling material.

[0036] In a second aspect, the present application provides a method for preparing a lightweight wallboard with radiative cooling and high thermal resistance, adopting the following technical solution: A method for preparing a lightweight wallboard with radiative cooling and high thermal resistance, for preparing the above-mentioned lightweight wallboard with radiative cooling and high thermal resistance, includes the following steps: Mixing: Weigh condensed aluminum phosphate, foam stabilizer, and radiative cooling material and mix them as composition A, weigh sodium silicate and hydroxy silicone oil and mix them as composition B, pour composition B into composition A and stir to mix, obtaining composition C; Foaming: Pour hydrogen peroxide into composition C and stir to mix, obtaining a mixture; Shaping: Pour the mixture into a mold and harden it to form a lightweight wallboard with radiative cooling and high thermal resistance.

[0037] By adopting the above technical solution, by mixing condensed aluminum phosphate, foam stabilizer (which may include calcium stearate, silicone amide, and polyvinyl alcohol, etc.), and radiative cooling material (such as barium sulfate) as composition A, it can ensure that these key components are evenly distributed in the initial stage. This helps to maintain the uniformity of the material during subsequent processing, thereby optimizing the overall performance of the wallboard. The addition of sodium silicate and hydroxy silicone oil not only helps to adjust the viscosity and fluidity of the material but also may form a more compact network structure with the components in composition A through chemical reactions, thereby improving the strength and durability of the wallboard.

[0038] Adding hydrogen peroxide to composition C and stirring to mix can initiate a chemical reaction and generate gas, thereby achieving foaming. Hydrogen peroxide, as a commonly used chemical foaming agent, has the advantages of high foaming efficiency, uniform and stable bubbles. Through this step, a mixture with a uniform bubble structure can be obtained, which is crucial for improving the lightness and heat insulation performance of the wallboard.

[0039] Pouring the foamed mixture into a mold and hardening it to form a lightweight wallboard can obtain a lightweight wallboard with precise dimensions and structure. The use of the mold ensures the forming accuracy and consistency of the wallboard, and also helps to maintain the structural stability of the material during the hardening process. During the hardening process, the chemical components in the material will further react and form a stable network structure, thereby improving the strength and durability of the wallboard.

[0040] In summary, the present application has the following beneficial effects: 1. In this application, sodium silicate and condensed aluminum phosphate can cooperate to provide a strong heat insulation effect, significantly reducing the impact of external high temperature on the indoor environment; the radiative cooling material can regulate the temperature of the wallboard, reduce the accumulation of heat, and make the indoor environment more comfortable; through the mutual cooperation among sodium silicate, condensed aluminum phosphate and the radiative cooling material, the heat accumulation problem of the wallboard can be well improved; 2. The foam stabilizer B in this application is composed of calcium stearate, silicone amide and polyvinyl alcohol, and the radiative cooling material is barium sulfate. Polyvinyl alcohol can prevent the agglomeration of barium sulfate particles, enabling barium sulfate to more fully exert its excellent radiative cooling performance. Description of the Drawings

[0041] Figure 1 It is a process schematic diagram of the preparation method of the lightweight wallboard with radiative cooling and high thermal resistance in Example 1. Detailed Description of the Embodiments

[0042] The raw materials in this application include the following parts: Sodium silicate: A commercially available product with a CAS number of 1344-09-8 is used; Condensed aluminum phosphate: A commercially available product with a CAS number of 7784-30-7 is used; Hydrogen peroxide: A commercially available product with a CAS number of 7722-84-1 is used; Calcium stearate: A commercially available product with a CAS number of 1592-23-0 is used; Silicone amide: A commercially available product with a CAS number of 625-07-9 is used; Polyvinyl alcohol: A commercially available product with a CAS number of 9002-89-5 is used; Barium sulfate: A commercially available product with a CAS number of 7727-43-7 is used; Nanosilica: The average particle size is 50 nm, and a commercially available product with a CAS number of 60676-86-0 is used; Titanium dioxide: A commercially available product with a CAS number of 1317-80-2 is used; Calcium carbonate: A commercially available product with a CAS number of 471-34-1 is used; Aluminum oxide: A commercially available product with a CAS number of 1344-28-1 is used; Hydroxy silicone oil: A commercially available product with a CAS number of 70131-67-8 is used; The following further elaborates on this application in conjunction with examples and comparative examples.

[0043] Example 1 A preparation method of a lightweight wallboard with radiative cooling and high thermal resistance includes the following steps: Mixing: Weigh 400 g of condensed aluminum phosphate, 25 g of calcium stearate, and 35 g of nano-silica and mix them as Composition A. Weigh 600 g of water glass and 50 g of hydroxyl silicone oil and mix them as Composition B. Pour Composition B into Composition A and stir to mix, obtaining Composition C; Foaming: Pour hydrogen peroxide into Composition C and stir to mix, obtaining a mixture; Shaping: Pour the mixture into a mold and harden it. Harden at room temperature for 24 h to obtain a lightweight wallboard with radiation cooling and high thermal resistance.

[0044] The preparation process is as Figure 1 .

[0045] Examples 2 - 3 Based on the preparation method of Example 1, for Examples 2 - 3, the component contents of the lightweight wallboard with radiation cooling and high thermal resistance are adjusted. The specific adjustments are shown in Table 1.

[0046] Comparative Examples 1 - 3 Based on the preparation method of Example 1, for Comparative Example 1, do not add 35 g of nano-silica, and keep the other conditions unchanged.

[0047] Based on the preparation method of Example 1, for Comparative Example 2, do not add 25 g of calcium stearate, and keep the other conditions unchanged.

[0048] For Comparative Example 3, a commercially available cement pressure plate from Jitai New Building Materials Shijiazhuang Co., Ltd. is used.

[0049] Table 1 Component contents of the lightweight wallboard with radiation cooling and high thermal resistance in Examples 1 - 3 and performance test table with Comparative Examples 1 - 3 Performance detection test Perform the following performance detections on Examples 1 - 3 and Comparative Examples 1 - 3. The detection results are shown in Table 1.

[0050] 1. Reduction amplitude of energy consumption in summer and winter.

[0051] Use the lightweight wallboard with radiation cooling and high thermal resistance to make a 20 m 2 model house. The thickness of the lightweight wallboard is 50 cm, and an air conditioner is installed inside.

[0052] Summer test: During the summer in tropical or subtropical regions, when the outdoor temperature remains above 35°C, the air conditioner in the model room is set to 25°C, and the energy consumption of the air conditioner is measured for 7 consecutive days. Taking the air conditioner energy consumption value of Comparative Example 3 as the comparison value, calculate the difference between the air conditioner energy consumption values of Examples 1-3 and Comparative Examples 1-2 and the air conditioner energy consumption value of Comparative Example 3, as well as the proportion of the difference in the air conditioner energy consumption value of Comparative Example 3, to obtain the summer energy consumption reduction amplitude value.

[0053] Winter test: During the winter in frigid regions, when the outdoor temperature remains below -15°C, the air conditioner in the model room is set to 21°C, and the energy consumption of the air conditioner is measured for 7 consecutive days. Taking the air conditioner energy consumption value of Comparative Example 1 as the comparison value, calculate the difference between the air conditioner energy consumption values of Examples 1-3 and Comparative Examples 1-2 and the air conditioner energy consumption value of Comparative Example 3, as well as the proportion of the difference in the air conditioner energy consumption value of Comparative Example 3, to obtain the winter energy consumption reduction amplitude value.

[0054] 2. Thermal conductivity The thermal conductivity test is carried out by a low-temperature universal thermal conductivity meter (TC3100) developed by Xi'an Xiaxi Technology. The test standard refers to GB / T 10295-2008 "Determination of Steady-State Thermal Resistance and Related Characteristics of Thermal Insulation Materials - Heat Flow Meter Method". The size specification of the specimen is 200×200×20mm 3 to obtain the thermal conductivity.

[0055] 3. Reflectivity The reflectivity test of the thermal insulation material is carried out by an ultraviolet-visible-near-infrared spectrophotometer (UV-1900i, IRTracer-100) developed by Shimadzu Corporation. The test standard refers to GB / T8807-1988 "Test Method for Specular Gloss of Plastics". The specimen specification is a flat surface specimen of 20×20×2mm 3 to measure the average solar reflectivity in the wavelength range of 0.25 - 2.5μm.

[0056] 4. Compressive strength and water resistance coefficient According to GB / T 17671-1999 "Test Method for the Strength of Cement Mortar", specimens with a specification of 40×40×40mm 3 are subjected to compressive strength testing to obtain the compressive strength value R0.

[0057] The above specimens are immersed in water with the liquid level exceeding the specimens by 5cm. After soaking for 7 days, they are taken out, the surface moisture is wiped dry, and their compressive strength value R1 is measured. Calculate the water resistance coefficient of the specimens = R1 / R0.

[0058] Referring to Table 1, by comparing Examples 1-3 and Comparative Examples 1-3, it can be seen that the reduction in energy consumption in summer and winter in Examples 1-3 is much greater than that in Comparative Example 1, and the reflectivity in Examples 1-3 is also much greater than that in Comparative Example 1. This shows that adding the radiative cooling material nano-silica can dissipate the heat absorbed by the wall panel into the atmosphere in the form of radiation, thereby reducing the temperature of the wall panel. When the temperature is too low, the wall can continuously release excess heat through radiative cooling to ensure the constancy of the wall temperature. Due to the high thermal resistance performance of the wall, heat is not easily lost, slowing down the fluctuation of the indoor temperature.

[0059] The compressive strength and water resistance coefficient of Examples 1-3 are much greater than those of Comparative Example 2, indicating that adding the foam stabilizer calcium stearate can effectively improve the structural stability and impermeability of the wall panel. This may be because hydrogen peroxide releases oxygen during decomposition, forming a uniform and stable bubble structure. Calcium stearate, through its unique chemical properties, effectively prevents the foam from breaking or collapsing during formation and curing, ensuring that the wall panel remains lightweight and has a uniform structure. And calcium stearate can reduce leakage problems caused by poor bonding at the interface by enhancing the interfacial bonding force.

[0060] The reflectivity of Examples 1-3 is much greater than that of Comparative Example 3, and the thermal conductivity is significantly lower than that of Comparative Example 3. The compressive strength and water resistance coefficient of Examples 1-3 are also greater than those of Comparative Example 3. This shows that when nano-silica is combined with sodium silicate and condensed aluminum phosphate, it can form a dense heat insulation layer in the wall panel, effectively reducing the penetration of heat. At the same time, it can fully dissipate the heat absorbed by the wall panel into the atmosphere in the form of radiation, thereby reducing the temperature of the wall panel. In addition, under the combined action of hydrogen peroxide foaming and calcium stearate as a foam stabilizer, the lightweight wall panel of the present application has excellent stability. In addition, it is detected that the density of the lightweight wall panel in Example 1 is 396 kg / m 3 , while the density of the cement board is 1783 kg / m 3 . This shows that through the foaming effect of hydrogen peroxide, the density of the lightweight wall panel of the present application is significantly reduced, facilitating the actual use and transportation of the lightweight wall panel.

[0061] Comparatively speaking, the performance of Example 1 is the best, and Example 1 is taken as the preferred one.

[0062] Examples 4-5 On the basis of the preparation method of Example 1, Examples 4-5 adjusted the type of foam stabilizer, and the specific adjustment is shown in Table 2.

[0063] The above performance tests were carried out on the radiative cooling and high thermal resistance lightweight wall panels of Examples 4-5, and the test results are shown in Table 2.

[0064] Table 2 Types of foam stabilizers and performance test table of Example 1 and Examples 4-5 Item Example 1 Example 4 Example 5 Type of foam stabilizer Calcium stearate Silicone amide Polyvinyl alcohol Compressive strength R0 / MPa 1.236 1.249 1.214 Water resistance coefficient 0.91 0.85 0.92 Referring to Table 2, by comparing Example 1 with Examples 4 - 5, it can be seen that all three foam stabilizers can be used in this application. Among them, silicone amide can enhance the compressive strength of the wallboard, but the impermeability of the wallboard is not good. Polyvinyl alcohol can enhance the impermeability of the wallboard, while the compressive strength of the wallboard is relatively low. Considering comprehensively, it is preferred to use calcium stearate as the foam stabilizer.

[0065] Examples 6 - 9 Based on the preparation method of Example 1, Examples 6 - 9 adjusted the types of radiation cooling materials, and the specific adjustments are shown in Table 3.

[0066] Perform the above performance tests on the radiation - cooled and high - thermal - resistance lightweight wallboards of Examples 6 - 9, and the test results are shown in Table 3.

[0067] Table 3 Types and performance test table of radiation cooling materials for Example 1 and Examples 6 - 9 Referring to Table 3, by comparing Example 1 with Examples 6 - 9, it can be seen that all five radiation cooling materials can be used in this application. Among them, nano - silica has the largest reduction in energy consumption and the highest reflectivity. Perhaps due to its small particle size and large specific surface area, nano - silica has high surface activity. This high activity enables nano - silica to be more easily mixed evenly with other components in the wallboard material, avoiding the occurrence of agglomeration. At the same time, good dispersibility ensures that nano - silica can form a continuous network structure inside the wallboard, which helps to improve the overall performance of the wallboard.

[0068] Examples 10 - 14 Based on the preparation method of Example 1, in Example 10, 35 g of nano - silica was replaced with a mixture of 35 g of nano - silica and barium sulfate, and the mass ratio of nano - silica to barium sulfate in the mixture was 1:1, with the other conditions remaining unchanged.

[0069] Based on the preparation method of Example 10, Examples 11 - 14 adjusted the mass ratio of nano - silica to barium sulfate, and the specific adjustments are shown in Table 4.

[0070] Perform the above performance tests on the radiation - cooled and high - thermal - resistance lightweight wallboards of Examples 10 - 14, and the test results are shown in Table 4.

[0071] Table 4 Mass ratio of nano - silica to barium sulfate and performance test table for Example 1 and Examples 10 - 14 Referring to Table 4, comparing Example 1 with Examples 10 - 14, it can be seen that when nano-silica and barium sulfate are mixed, the ability to reduce the air-conditioning energy consumption is stronger than that of adding nano-silica alone, and the reflectivity is also higher. This may be because barium sulfate, due to its high electron bandgap, can effectively reduce the absorption of sunlight. At the same time, its phonon resonance wavelength matches the atmospheric window, resulting in a high emissivity in the atmospheric window band. An excessive amount of barium sulfate is prone to agglomeration, but a small amount of barium sulfate is evenly dispersed in the wallboard, and the high radiative cooling performance of barium sulfate can be fully exerted.

[0072] As the mass proportion of barium sulfate in the mixture continuously increases, the reduction amplitude of the summer energy consumption, the reduction amplitude of the winter energy consumption, and the reflectivity of the wallboard show a trend of first increasing and then decreasing. This may be because as the mass proportion of barium sulfate in the mixture continuously increases, barium sulfate can gradually exert its high radiative cooling performance. When exceeding a certain range, the dispersibility of barium sulfate in the wallboard is not as good as that of nano-silica, and it is prone to agglomeration, which instead reduces the radiative cooling performance of the radiative cooling and high thermal resistance lightweight wallboard.

[0073] Examples 15 - 17 Based on the preparation method of Example 1, in Example 15, 25 g of calcium stearate was replaced with 25 g of foam-stabilizing mixture A composed of 14 g of calcium stearate and 11 g of silicone amide, and the other conditions remained unchanged.

[0074] Based on the preparation method of Example 1, in Example 16, 25 g of calcium stearate was replaced with 35 g of a mixture composed of 11 g of silicone amide and 14 g of polyvinyl alcohol, and the other conditions remained unchanged.

[0075] Based on the preparation method of Example 1, in Example 17, 25 g of calcium stearate was replaced with 35 g of a mixture composed of 14 g of calcium stearate and 11 g of polyvinyl alcohol, and the other conditions remained unchanged.

[0076] The lightweight wallboards with radiative cooling and high thermal resistance of Examples 15 - 17 were subjected to the above performance tests, and the test results are shown in Table 5.

[0077] Table 5 Addition amounts of calcium stearate, silicone amide, and polyvinyl alcohol and performance test table of Example 1 and Examples 15 - 17 Referring to Table 5, by comparing Example 1 with Examples 15 - 17, it can be seen that when the three foam stabilizers are paired in pairs, the combination of calcium stearate and silicone amide has the best comprehensive performance. This may be because silicone amide can not only stabilize bubbles but also interact with other components in wallboard materials such as condensed aluminum phosphate and water glass. This interaction helps to form a more stable network structure, which plays a role in enhancing the overall stability inside the wallboard. When silicone amide and calcium stearate are used in combination, they can jointly improve the stability of the material from different aspects.

[0078] Examples 18 - 21 Based on the preparation method of Example 15, for Examples 18 - 21, the mass ratio of calcium stearate and silicone amide in 25 g of foam stabilizer mixture A was adjusted, and the specific adjustments are shown in Table 6.

[0079] Perform the above performance tests on the lightweight wallboards with radiation cooling and high thermal resistance of Examples 18 - 21, and the test results are shown in Table 6.

[0080] Table 6 Mass ratio of calcium stearate and silicone amide in foam stabilizer mixture A of Example 1, Example 15 and Examples 18 - 21 and performance test table Referring to Table 6, by comparing Example 1 with Examples 18 - 21, it can be seen that as the mass proportion of silicone amide in foam stabilizer mixture A increases, the compressive strength R0 and water resistance coefficient of the wallboard show a trend of first increasing and then decreasing. This may be because as the mass proportion of silicone amide in foam stabilizer mixture A increases, silicone amide can gradually interact with other components (such as condensed aluminum phosphate and water glass) in the wallboard material to form a more stable overall structure. Silicone amide can better cooperate with calcium stearate to improve the compressive strength R0 of the material. When exceeding a certain range, due to the relatively small content proportion of calcium stearate, the cooperation effect of calcium stearate and silicone amide decreases, slightly reducing the compressive strength R0 of the wallboard and even reducing the impermeability of the wallboard.

[0081] Examples 22 - 24 Based on the preparation method of Example 1, for Example 22, 25 g of calcium stearate was replaced with 25 g of foam stabilizer mixture B, and the mass ratio of calcium stearate, silicone amide and polyvinyl alcohol in foam stabilizer mixture B is 1:0.6:0.6, with other conditions remaining unchanged.

[0082] Based on the preparation method of Example 1, for Examples 23 - 24, the mass ratio of calcium stearate, silicone amide and polyvinyl alcohol in foam stabilizer mixture B was adjusted, and the specific adjustments are shown in Table 7.

[0083] Perform the above performance tests on the lightweight wall panels with radiative cooling and high thermal resistance in Examples 22 - 24, and the test results are shown in Table 7.

[0084] Table 7 Mass ratios of calcium stearate, silicone amide, and polyvinyl alcohol in the foam stabilizer B of Example 1 and Examples 22 - 24 and performance test table Referring to Table 7, by comparing Example 1 and Examples 22 - 24, it can be seen that when the foam stabilizer is a mixture of calcium stearate, silicone amide, and polyvinyl alcohol, the compressive strength and water resistance coefficient of the wall panel can be further improved. The reason is that polyvinyl alcohol can form hydrogen bonds and other interactions with other components in the material, and these interactions enhance the structural stability of the bubbles and the overall wall panel. Polyvinyl alcohol may also fill the tiny pores and cracks in the material, which are often the channels for water penetration. By filling these channels, polyvinyl alcohol improves the water impermeability of the wall panel. When these three components, calcium stearate, silicone amide, and polyvinyl alcohol, are used in combination, they can jointly improve the structural stability and water impermeability of the wall panel from different aspects. This synergistic effect enables the wall panel material to maintain a more uniform and stable bubble structure during the preparation and curing processes, while improving the overall strength and water impermeability of the material.

[0085] Example 25 Based on the preparation method of Example 22, in Example 25, 35 g of nano - silica is replaced with 35 g of barium sulfate for adjustment, and the specific adjustment is shown in Table 8.

[0086] Perform the above performance tests on the lightweight wall panels with radiative cooling and high thermal resistance in Examples 22 and 25, and the test results are shown in Table 8.

[0087] Table 8 Performance test table of Example 1, Example 6, Example 22, and Example 25 Item Example 1 Example 6 Example 22 Example 25 Reduction rate of energy consumption in summer / % 17.3 16.1 17.4 22.8 Reduction rate of energy consumption in winter / % 22.8 21.3 22.9 28.3 Reflectivity / % 80.4 79.5 80.5 83.8 Referring to Table 8, by comparing Example 1, Example 6, Example 22, and Example 25, it can be seen that the foam stabilizer B is composed of a mixture of calcium stearate, silicone amide, and polyvinyl alcohol. When combined with barium sulfate, it can further improve the radiative cooling performance of the material. The reason may be that polyvinyl alcohol is a high - molecular compound with good adsorption and film - forming properties. In the foam stabilizer B, polyvinyl alcohol can adsorb on the surface of barium sulfate particles to form a thin coating layer. This coating layer not only increases the steric hindrance between barium sulfate particles but also effectively reduces the interaction force between the particles, thus preventing the agglomeration of the particles. When the barium sulfate particles are difficult to agglomerate, they can more fully exert their excellent radiative cooling performance.

[0088] This specific embodiment is only an interpretation of the present application and does not limit the present application. After reading this specification, those skilled in the art can make modifications to this embodiment without creative contributions as needed, but as long as it is within the scope of the claims of the present application, it is protected by the patent law.

Claims

1. A lightweight wall panel with radiation cooling and high thermal resistance, characterized in that: The invention comprises the following components in parts by weight: 600 parts of water glass, 380-400 parts of condensed aluminum phosphate, 40-45 parts of hydrogen peroxide, 20-25 parts of foam stabilizer, 30-35 parts of radiation cooling material, and 45-50 parts of hydroxy silicone oil; The foam stabilizer comprises at least one of calcium stearate, silicone amide and polyvinyl alcohol; The radiation cooling material includes at least one of barium sulfate, nano silicon dioxide, titanium dioxide, calcium carbonate and aluminum oxide.

2. The radiant cooling and high thermal resistance lightweight wall panel according to claim 1, characterized in that: The foam stabilizer is calcium stearate.

3. The radiant cooling and high thermal resistance lightweight wall panel according to claim 2, characterized in that: The radiation cooling material is nano silicon dioxide.

4. The radiant cooling and high thermal resistance lightweight wall panel according to claim 2, characterized in that: The radiation cooling material is a radiation cooling mixture of nano silicon dioxide and barium sulfate, and the mass ratio of nano silicon dioxide to barium sulfate in the radiation cooling mixture is 1:0.7-1.

2.

5. The radiant cooling and high thermal resistance lightweight wall panel according to claim 1, characterized in that: The foam stabilizer is a foam stabilizer mixture A of calcium stearate and silicone amide.

6. The radiant cooling and high thermal resistance lightweight wall panel according to claim 5, characterized in that: The mass ratio of calcium stearate to silicone amide in the foam stabilizing mixture A is 1:0.5-1.

7. The radiant cooling and high thermal resistance lightweight wall panel according to claim 1, characterized in that: The foam stabilizer is a foam stabilizer mixture B of calcium stearate, silicone amide and polyvinyl alcohol.

8. The radiant cooling and high thermal resistance lightweight wall panel according to claim 7, characterized in that: The mass ratio of calcium stearate, silicone amide and polyvinyl alcohol in the foam stabilizing mixture B is 1: (0.6-0.8): (0.4-0.6).

9. The radiant cooling and high thermal resistance lightweight wall panel according to claim 7, characterized in that: The radiation cooling material is barium sulfate.

10. A method for preparing a lightweight wallboard with radiation cooling and high thermal resistance, characterized in that: The method for preparing a lightweight wallboard with radiation cooling and high thermal resistance according to any one of claims 1 to 9 comprises the following steps: Mixing: weighing condensed aluminum phosphate, foam stabilizer, and radiation cooling material and mixing them as composition A, weighing water glass and hydroxy silicone oil and mixing them as composition B, pouring the composition B into the composition A and stirring and mixing, to obtain composition C; Foaming: pouring hydrogen peroxide into the composition C, stirring and mixing to obtain a mixture; Shaping: The mixture is poured into a mold to harden and shape, thereby obtaining a lightweight wall panel with radiation cooling and high thermal resistance.

Images