A lightweight wall panel with radiant cooling and high thermal resistance and a method of making the same

Abstract

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

Description

Technical Field

[0001] This application relates to the field of building materials technology, specifically to a lightweight wall panel with radiative cooling and high thermal resistance, and a method for preparing the same. Background Technology

[0002] With the increasing demands for energy efficiency and environmental protection in the construction industry, building energy-saving technologies have gradually become a core direction in building design and material research and development. As the primary insulating layer between the building's external and internal environments, walls directly affect the building's thermal performance. Most existing building wall materials focus on reducing heat conduction through insulation and heat preservation, thereby improving the building's energy efficiency.

[0003] With the increase in high temperatures during the summer, walls that rely solely on insulation materials often face the problem of heat accumulation, leading to excessively high indoor temperatures, affecting indoor comfort, and increasing the load on air conditioning and cooling systems. Summary of the Invention

[0004] To address the problem of heat buildup in existing walls during hot weather, which affects indoor comfort and increases the load on air conditioning and refrigeration systems, this application provides a lightweight wall panel with radiative cooling and high thermal resistance. This wall panel effectively improves the heat buildup problem through the synergistic effect of water glass, condensed aluminum phosphate, and radiative cooling materials.

[0005] In a first aspect, this application provides a lightweight wall panel with radiative cooling and high thermal resistance, employing the following technical solution: A lightweight wall panel with radiative cooling and high thermal resistance 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 radiative cooling material, and 45-50 parts of hydroxyl silicone oil; wherein the foam stabilizer comprises at least one of calcium stearate, silicone amide, and polyvinyl alcohol;

[0006] The radiation cooling material includes at least one of barium sulfate, nano-silica, titanium dioxide, calcium carbonate, and aluminum oxide.

[0007] By employing the above technical solutions, water glass (sodium silicate aqueous solution) exhibits excellent adhesion and heat resistance, enabling it to form a stable structure within the wall panel and aiding in heat insulation. Condensed aluminum phosphate, an inorganic material, possesses superior high-temperature resistance and thermal stability. It can form a dense insulating layer within the wall panel, effectively reducing heat penetration. The combination of these two components provides the wall panel with a powerful thermal insulation effect, significantly reducing the impact of external high temperatures on the indoor environment.

[0008] Radiant cooling materials include barium sulfate, nano-silica, titanium dioxide, calcium carbonate, and aluminum oxide. These materials have excellent radiant heat dissipation properties, dissipating the heat absorbed by the wall panels into the atmosphere through radiation, thereby reducing the wall panel temperature. The effect of radiant cooling materials is particularly significant in hot weather. They can regulate the temperature of the wall panels, reduce heat accumulation, and make the indoor environment more comfortable.

[0009] In this application, water glass and condensed aluminum phosphate work together to provide a strong thermal insulation effect, which can significantly reduce the impact of high external temperatures on the indoor environment; the radiant cooling material can regulate the temperature of the wall panel, reduce heat accumulation, and make the indoor environment more comfortable; through the synergy between water glass, condensed aluminum phosphate and radiant cooling material, the problem of heat accumulation in the wall panel can be effectively improved.

[0010] Preferably, the foam stabilizer is calcium stearate.

[0011] By employing the above technical solution, hydrogen peroxide releases oxygen upon decomposition, forming a uniform and stable bubble structure. These bubbles are crucial for reducing the material's density, enhancing its lightweight nature, and improving its thermal insulation. Calcium stearate, through its unique chemical properties, effectively prevents the foam from cracking or collapsing during formation and curing, ensuring the wall panel remains lightweight and structurally uniform.

[0012] The stability of the foam structure directly affects the lightweight and thermal insulation properties of the wall panel. Calcium stearate stabilizes the foam, allowing the wall panel to maintain excellent thermal insulation performance while retaining a low density. This is significant for reducing heat transfer and improving indoor comfort.

[0013] Radiant cooling materials are prone to condensation at the cooling wall surface, which can adversely affect the performance of the wall panel. Calcium stearate, by enhancing interfacial adhesion, can reduce leakage problems caused by poor bonding at the interface. Calcium stearate reduces the possibility of moisture penetration, thereby extending the service life of the wall panel and maintaining its good thermal insulation performance.

[0014] Compared to silicone amide and polyvinyl alcohol, calcium stearate not only improves the stability of bubbles but also enhances the impermeability of wall panels, resulting in superior overall performance.

[0015] Preferably, the radiation cooling material is nano-silica.

[0016] By employing the above-mentioned technical solution, the particle size of nano-silica is extremely small, resulting in a very large specific surface area. This high specific surface area means that the surface of the nano-silica particles contains a large number of active sites, which can form stronger interactions with other materials, thus achieving more uniform dispersion in the wallboard. Due to its small particle size and large specific surface area, nano-silica exhibits high surface activity. This high activity allows nano-silica to be more easily and uniformly mixed with other components in the wallboard material, avoiding agglomeration. Simultaneously, its excellent dispersibility ensures that nano-silica can form a continuous network structure within the wallboard, which helps improve the overall performance of the wallboard.

[0017] The primary function of radiative cooling materials is to regulate the temperature of wall panels and reduce heat accumulation. Nano-silica, due to its uniform dispersion and high activity, can more effectively absorb and radiate heat within the wall panel. When the external temperature rises, nano-silica can rapidly dissipate heat into the atmosphere through radiation, thereby lowering the wall panel temperature. This efficient heat transfer mechanism makes nano-silica outstanding in improving the temperature regulation capabilities of wall panels.

[0018] Compared to traditional radiative cooling materials such as barium sulfate, calcium carbonate, and aluminum oxide, nano-silica, due to its small particle size, large specific surface area, high surface activity, and high dispersibility, can be more uniformly dispersed in wall panels, forming a denser radiative cooling network. This helps improve the overall thermal radiation efficiency of the wall panel, thereby enhancing its temperature regulation capabilities.

[0019] Preferably, the radiation cooling material is a radiation cooling mixture of nano-silica and barium sulfate, wherein the mass ratio of nano-silica to barium sulfate in the radiation cooling mixture is 1:0.7-1.2.

[0020] By employing the above-mentioned technical solutions, barium sulfate, due to its high electron band gap, can effectively reduce the absorption of sunlight. Simultaneously, its phonon resonance wavelength matches the atmospheric window, resulting in high emissivity in the atmospheric window band. These characteristics make barium sulfate a highly efficient radiative cooling material. However, excessive barium sulfate content can easily lead to agglomeration. Agglomerated barium sulfate particles can form hot spots, reducing the overall radiative cooling performance of the wall panel. When nano-silica and barium sulfate are mixed, the dispersion properties of nano-silica can be fully utilized, and due to the small amount of barium sulfate, the agglomeration effect is not significant. The combination of the two results in better radiative cooling performance.

[0021] When the barium sulfate content is too low, the improvement in the radiative cooling performance of the wall panel is not significant. When the barium sulfate content is too high, excessive barium sulfate is also prone to agglomeration, which actually reduces the radiative cooling performance of the wall panel. Therefore, the mass ratio of nano-silica to barium sulfate mentioned above is preferable.

[0022] Preferably, the foam stabilizer is a foam stabilizer mixture A of calcium stearate and silicone amide.

[0023] By employing the above-mentioned technical solution, silicone amides possess a unique dendritic three-dimensional spatial structure, which endows them with unique physical and chemical properties. This dendritic structure allows silicone amide molecules to form complex networks within the material. These networks effectively stabilize the bubble structure, preventing bubbles from rupturing or collapsing during preparation and curing. Silicone amides not only stabilize bubbles but also interact with other components in wallboard materials, such as condensed aluminum phosphate and water glass. This interaction contributes to the formation of a more stable network structure, which enhances the overall stability within the wallboard.

[0024] Calcium stearate, as a traditional foam stabilizer, also possesses excellent bubble stabilization properties. When used in combination with silicone amide, both can synergistically improve the stability of the material from different perspectives. Simultaneously, calcium stearate can also enhance the impermeability of wall panels.

[0025] Preferably, the mass ratio of calcium stearate and silicone amide in the foam stabilizer mixture A is 1:0.5-1.

[0026] By employing the above technical solution, silicone amide plays a crucial role in foam stabilizers; its unique dendritic three-dimensional spatial structure helps stabilize the bubble structure. If the silicone amide content is too low, it may not be able to form a sufficient number of stable network structures to effectively support the bubbles. Silicone amide not only stabilizes bubbles but also interacts with other components in the wallboard material (such as condensed aluminum phosphate and water glass) to form a more stable overall structure. Insufficient silicone amide content may prevent it from fully interacting with other components, thereby reducing the overall stability of the material.

[0027] When the content of silicone amide is too high, the content of calcium stearate is relatively low, which will significantly reduce the impermeability of the wall panel. Therefore, the mass ratio of calcium stearate to silicone amide as described above is preferable.

[0028] Preferably, the foam stabilizer is a foam stabilizer mixture B of calcium stearate, silicone amide and polyvinyl alcohol.

[0029] By employing the above technical solution, polyvinyl alcohol plays multiple roles in the foam stabilizer B. First, it can form hydrogen bonds and other interactions with other components in the material, enhancing the structural stability of the bubbles and the overall wallboard. The formation of hydrogen bonds increases the intermolecular forces, making the wallboard more resistant to damage under external forces. Second, polyvinyl alcohol can fill tiny pores and cracks in the material, which are often channels for moisture penetration. By filling these channels, polyvinyl alcohol improves the wallboard's impermeability, allowing it to maintain excellent performance even in humid environments.

[0030] When calcium stearate, silicone amide, and polyvinyl alcohol are used in combination, they work together to improve the structural stability and impermeability of the wall panel from different perspectives. Calcium stearate stabilizes the bubble structure, silicone amide forms a complex network structure and enhances its interaction with other components, while polyvinyl alcohol further enhances structural stability and impermeability by forming hydrogen bonds and filling micropores. This synergistic effect allows the wall panel material to maintain a more uniform and stable bubble structure during preparation and curing, while improving the overall strength and impermeability of the material.

[0031] 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).

[0032] By adopting the above technical solution, calcium stearate, silicone amide, and polyvinyl alcohol in the above proportions result in a material with a more stable structure and impermeability.

[0033] Preferably, the radiation cooling material is barium sulfate.

[0034] By adopting the above technical solution, barium sulfate, as a highly efficient radiative cooling material, has broad application potential in building materials such as lightweight wall panels. However, excessive barium sulfate particles are prone to agglomeration, which not only reduces its radiative cooling performance but may also affect the overall performance and uniformity of the wall panel. When barium sulfate is used in combination with foam stabilizer B, the polyvinyl alcohol component in foam stabilizer B can effectively solve this problem.

[0035] Polyvinyl alcohol (PVA) is a high molecular weight compound with excellent adsorption and film-forming properties. In foam stabilizer B, PVA can adsorb onto the surface of barium sulfate particles, forming a thin coating layer. This coating layer not only increases the steric hindrance between barium sulfate particles but also effectively reduces the interaction forces between particles, thereby preventing particle aggregation.

[0036] When barium sulfate particles are difficult to agglomerate, they can more fully exert their excellent radiative cooling properties. Barium sulfate's high electronic band gap allows it to effectively reduce sunlight absorption, while its phonon resonance wavelength matching the atmospheric window results in high emissivity in the atmospheric window band. These properties make barium sulfate an ideal radiative cooling material.

[0037] Secondly, this application provides a method for preparing a lightweight wall panel with radiation cooling and high thermal resistance, employing the following technical solution:

[0038] A method for preparing a lightweight wall panel with radiation cooling and high thermal resistance, comprising the following steps:

[0039] Mixing: Weigh out aluminum condensate, foam stabilizer, and radiation cooling material and mix them as composition A; weigh out water glass and hydroxyl silicone oil and mix them as composition B; pour composition B into composition A and stir to mix to obtain composition C;

[0040] Foaming: Pour hydrogen peroxide into composition C, stir and mix to obtain a mixture;

[0041] Shaping: The mixture is poured into a mold to harden and shape, resulting in a lightweight wall panel with radiative cooling and high thermal resistance.

[0042] By employing the above technical solution, and mixing condensed aluminum phosphate, foam stabilizers (which may include calcium stearate, silicone amide, and polyvinyl alcohol, etc.), and radiation cooling materials (such as barium sulfate) into composition A, it is possible to ensure that these key components are uniformly distributed in the initial stage. This helps maintain the uniformity of the material during subsequent processing, thereby optimizing the overall performance of the wall panel. The addition of water glass and hydroxyl silicone oil not only helps to adjust the viscosity and flowability of the material, but may also form a tighter network structure with the components in composition A through chemical reactions, thereby improving the strength and durability of the wall panel.

[0043] Adding hydrogen peroxide to composition C and stirring it initiates a chemical reaction and generates gas, thus achieving foaming. Hydrogen peroxide, a commonly used chemical foaming agent, has advantages such as high foaming efficiency, uniform and stable bubbles. This step yields a mixture with a uniform bubble structure, which is crucial for improving the lightweight and thermal insulation performance of the wall panel.

[0044] The foamed mixture is poured into a mold and hardened to obtain lightweight wall panels with precise dimensions and structure. The use of molds ensures the molding accuracy and consistency of the wall panels, while also helping to maintain the structural stability of the material during the hardening process. During hardening, the chemical components in the material react further and form a stable network structure, thereby improving the strength and durability of the wall panels.

[0045] In summary, this application has the following beneficial effects:

[0046] 1. In this application, water glass and condensed aluminum phosphate can work together to provide a strong thermal insulation effect, which can significantly reduce the impact of high external temperatures on the indoor environment; the radiant cooling material can regulate the temperature of the wall panel, reduce heat accumulation, and make the indoor environment more comfortable; through the synergy between water glass, condensed aluminum phosphate and radiant cooling material, the problem of heat accumulation in the wall panel can be effectively improved.

[0047] 2. The foam stabilizer B of this application is composed of calcium stearate, silicone amide and polyvinyl alcohol, and the radiation cooling material is barium sulfate. Polyvinyl alcohol can prevent the agglomeration of barium sulfate particles, allowing barium sulfate to more fully exert its excellent radiation cooling performance. Attached Figure Description

[0048] Figure 1 This is a schematic diagram of the process for preparing the lightweight wall panel with radiation cooling and high thermal resistance in Example 1. Detailed Implementation

[0049] The raw materials in this application include the following:

[0050] Water glass: Commercially available product with CAS number 1344-09-8;

[0051] Condensed aluminum phosphate: Commercially available product with CAS number 7784-30-7 is used;

[0052] Hydrogen peroxide: Uses commercially available products with CAS number 7722-84-1;

[0053] Calcium stearate: Uses commercially available products with CAS number 1592-23-0;

[0054] Silicone amide: Use commercially available products with CAS number 625-07-9;

[0055] Polyvinyl alcohol: Uses commercially available products with CAS number 9002-89-5;

[0056] Barium sulfate: Commercially available product with CAS number 7727-43-7 is used;

[0057] Nano silica: average particle size 50nm, using commercially available products with CAS number 60676-86-0;

[0058] Titanium dioxide: Commercially available product with CAS number 1317-80-2 is used;

[0059] Calcium carbonate: Commercially available product with CAS number 471-34-1;

[0060] Aluminum oxide: Uses commercially available products with CAS number 1344-28-1;

[0061] Hydroxyl silicone oil: Commercially available product with CAS number 70131-67-8 is used;

[0062] The present application will be further described in detail below with reference to embodiments and comparative examples.

[0063] Example 1

[0064] A method for preparing a lightweight wall panel with radiation cooling and high thermal resistance includes the following steps:

[0065] Mixing: Weigh 400g of condensed aluminum phosphate, 25g of calcium stearate and 35g of nano silica and mix them as composition A. Weigh 600g of water glass and 50g of hydroxyl silicone oil and mix them as composition B. Pour composition B into composition A and stir to mix to obtain composition C.

[0066] Foaming: Pour hydrogen peroxide into composition C, stir and mix to obtain a mixture;

[0067] Shaping: Pour the mixture into a mold to harden and shape it. Harden at room temperature for 24 hours to obtain a lightweight wall panel with radiation cooling and high thermal resistance.

[0068] Preparation process as follows Figure 1 .

[0069] Example 2-3

[0070] Based on the preparation method of Example 1, Examples 2-3 adjust the content of each component of the radiative cooling and high thermal resistance lightweight wall panel, as shown in Table 1.

[0071] Comparative Examples 1-3

[0072] Comparative Example 1 was prepared using the same method as in Example 1, but without adding 35g of nano-silica, while keeping all other conditions unchanged.

[0073] Comparative Example 2 was prepared using the same method as in Example 1, but without the addition of 25g of calcium stearate, while keeping all other conditions unchanged.

[0074] Comparative Example 3 uses commercially available cement pressure boards from Jitai New Building Materials Shijiazhuang Co., Ltd.

[0075] Table 1. Component content of the radiative cooling and high thermal resistance lightweight wall panels in Examples 1-3, and performance test results compared to Comparative Examples 1-3.

[0076]

[0077]

[0078] Performance testing

[0079] The performance of Examples 1-3 and Comparative Examples 1-3 was tested as follows, and the test results are shown in Table 1.

[0080] 1. The degree of energy consumption reduction in summer and winter.

[0081] 20m² constructed using lightweight wall panels with radiant cooling and high thermal resistance. 2 The model house has lightweight wall panels that are 50cm thick and is equipped with air conditioning inside.

[0082] Summer Testing: During the summer in tropical or subtropical regions, with outdoor temperatures maintained above 35°C, the air conditioning temperature inside the model house was set to 25°C. The energy consumption of the air conditioning was measured continuously for 7 days. Using the air conditioning energy consumption value of Comparative Example 3 as a comparison value, the difference between the air conditioning energy consumption values ​​of Examples 1-3 and Comparative Examples 1-2 and the air conditioning energy consumption value of Comparative Example 3 was calculated, along with the proportion of the difference in the air conditioning energy consumption value of Comparative Example 3, to obtain the reduction in summer energy consumption.

[0083] Winter Testing: During winter in frigid regions, with outdoor temperatures maintained below -15°C, the air conditioning temperature inside the model house was set to 21°C. The energy consumption of the air conditioning was measured continuously for 7 days. Using the air conditioning energy consumption value of Comparative Example 1 as a reference, the difference between the air conditioning energy consumption values ​​of Examples 1-3 and Comparative Examples 1-2 and the air conditioning energy consumption value of Comparative Example 3 was calculated, along with the percentage of this difference in the air conditioning energy consumption value of Comparative Example 3, to obtain the reduction in winter energy consumption.

[0084] 2. Thermal conductivity

[0085] Thermal conductivity was tested using a low-temperature general-purpose thermal conductivity meter (TC3100) developed by Xi'an Xiaxi Technology. The testing standard referenced GB / T 10295-2008 "Determination of Steady-State Thermal Resistance and Related Properties of Insulation Materials - Heat Flow Meter Method". The meter's dimensions are 200×200×20mm. 3 The thermal conductivity of the specimen was obtained.

[0086] 3. Reflectivity

[0087] The reflectance of the thermal insulation material was tested using a Shimadzu UV-Vis-NIR spectrophotometer (UV-1900i, IRTracer-100), following the standard GB / T8807-1988 "Test Method for Specular Gloss of Plastics". The sample size was 20×20×2mm. 3 The average solar reflectance of the flat surface specimens was measured in the wavelength range of 0.25-2.5μm.

[0088] 4. Compressive strength and water resistance coefficient

[0089] According to GB / T 17671-1999 "Test Method for Strength of Cement Mortar", the specification is 40×40×40mm. 3 The specimens were subjected to compressive strength tests to obtain the compressive strength value R0.

[0090] The above specimens were immersed in water with the water level 5 cm above the specimens. After 7 days of immersion, the specimens were removed, their surface moisture was wiped dry, and their compressive strength value R1 was tested. The water resistance coefficient of the specimens was calculated as R1 / R0.

[0091] Referring to Table 1, a comparison of Examples 1-3 and Comparative Examples 1-3 shows that the energy consumption reduction in both summer and winter for Examples 1-3 is significantly greater than that for Comparative Example 1. Furthermore, the reflectivity of Examples 1-3 is also significantly higher than that of Comparative Example 1. This indicates that the addition of nano-silica, a radiative cooling material, allows the heat absorbed by the wall panel to be dissipated into the atmosphere through radiation, thereby reducing the wall panel's temperature. When the temperature is too low, the wall can also continuously release excess heat through radiative cooling, ensuring a constant wall temperature. Due to the wall's high thermal resistance, heat is not easily lost, mitigating fluctuations in indoor temperature.

[0092] The compressive strength and water resistance coefficient of Examples 1-3 are significantly greater than those of Comparative Example 2, indicating that the addition of calcium stearate as a foam stabilizer can effectively improve the structural stability and impermeability of the wall panel. This is likely because hydrogen peroxide releases oxygen upon decomposition, forming a uniform and stable bubble structure. Calcium stearate, through its unique chemical properties, effectively prevents the foam from cracking or collapsing during formation and curing, ensuring that the wall panel remains lightweight and structurally uniform. Furthermore, calcium stearate enhances interfacial adhesion, reducing leakage problems caused by poor bonding at the interface.

[0093] The reflectivity of Examples 1-3 is significantly higher than that of Comparative Example 3, while the thermal conductivity is significantly lower. The compressive strength and water resistance coefficient of Examples 1-3 are also greater than those of Comparative Example 3. This indicates that nano-silica, when combined with water glass and condensed aluminum phosphate, can form a dense heat insulation layer in the wall panel, effectively reducing heat penetration. Simultaneously, it can fully dissipate the heat absorbed by the wall panel into the atmosphere through radiation, thereby reducing the wall panel's temperature. Furthermore, with the combined action of hydrogen peroxide foaming and calcium stearate as a foam stabilizer, the lightweight wall panel of this application exhibits excellent stability. Additionally, testing revealed that the density of the lightweight wall panel of Example 1 is 396 kg / m³. 3 The density of cement board is 1783 kg / m³. 3 This application demonstrates that the lightweight wall panel, through the foaming effect of hydrogen peroxide, significantly reduces its density, facilitating its practical use and transportation.

[0094] In comparison, Example 1 has the best performance and is therefore preferred.

[0095] Examples 4-5

[0096] Examples 4-5 are based on the preparation method of Example 1, but the type of foam stabilizer is adjusted, as shown in Table 2.

[0097] The lightweight wall panels with radiative cooling and high thermal resistance of Examples 4-5 were subjected to the above performance tests, and the test results are shown in Table 2.

[0098] Table 2. Types of foam stabilizers and their performance test results in Examples 1 and 4-5.

[0099] project Example 1 Example 4 Example 5 Types of foam stabilizers 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

[0100] Referring to Table 2, a comparison of Examples 1 and 4-5 shows that all three foam stabilizers can be used in this application. Silicone amide can enhance the compressive strength of the wall panel, but its impermeability is poor. Polyvinyl alcohol can enhance the impermeability of the wall panel, but its compressive strength is low. Overall, calcium stearate is the preferred foam stabilizer.

[0101] Examples 6-9

[0102] Examples 6-9 are based on the preparation method of Example 1, but the type of radiation cooling material is adjusted, as shown in Table 3.

[0103] The lightweight wall panels with radiative cooling and high thermal resistance of Examples 6-9 were subjected to the above performance tests, and the test results are shown in Table 3.

[0104] Table 3. Types and performance tests of radiant cooling materials in Examples 1 and 6-9.

[0105]

[0106] Referring to Table 3, a comparison of Examples 1 and 6-9 shows that all five radiation cooling materials can be used in this application. Among them, nano-silica exhibits the greatest reduction in energy consumption and the highest reflectivity. This is likely due to the small particle size and large specific surface area of ​​nano-silica, resulting in high surface activity. This high activity allows nano-silica to be more easily and uniformly mixed with other components in the wall panel material, avoiding agglomeration. Simultaneously, its good dispersibility ensures that nano-silica can form a continuous network structure within the wall panel, which helps improve the overall performance of the wall panel.

[0107] Examples 10-14

[0108] Example 10 is based on the preparation method of Example 1, except that 35g of nano-silica is replaced with a mixture of 35g of nano-silica and barium sulfate, and the mass ratio of nano-silica to barium sulfate in the mixture is 1:1, while the other conditions remain unchanged.

[0109] Examples 11-14 are based on the preparation method of Example 10, but the mass ratio of nano-silica and barium sulfate is adjusted as shown in Table 4.

[0110] The lightweight wall panels with radiative cooling and high thermal resistance of Examples 10-14 were subjected to the above performance tests, and the test results are shown in Table 4.

[0111] Table 4. Mass ratio and performance test results of nano-silica and barium sulfate in Examples 1 and 10-14.

[0112]

[0113] Referring to Table 4, a comparison of Examples 1 and 10-14 shows that when nano-silica and barium sulfate are mixed, the ability to reduce 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 band gap, can effectively reduce the absorption of sunlight. Simultaneously, its phonon resonance wavelength matches the atmospheric window, resulting in high emissivity in the atmospheric window band. Excessive barium sulfate content can easily lead to agglomeration, but a small amount of barium sulfate is more uniformly dispersed in the wall panel, fully utilizing its high radiative cooling performance.

[0114] As the mass percentage of barium sulfate in the mixture increases, the reduction in energy consumption in summer and winter, as well as the reflectivity of the wall panel, show a trend of first increasing and then decreasing. This may be because, with the increasing mass percentage of barium sulfate in the mixture, barium sulfate can gradually exert its high radiative cooling performance. However, beyond a certain range, the dispersibility of barium sulfate in the wall panel is not as good as that of nano-silica, and it is prone to agglomeration, which reduces the radiative cooling performance of the lightweight wall panel with high thermal resistance.

[0115] Examples 15-17

[0116] Example 15 is based on the preparation method of Example 1, except that 25g of calcium stearate is replaced with 25g of foam stabilizer mixture A composed of 14g of calcium stearate and 11g of silicone amide, while the other conditions remain unchanged.

[0117] Example 16 is based on the preparation method of Example 1, except that 25g of calcium stearate is replaced with a 35g mixture of 11g of silicone amide and 14g of polyvinyl alcohol, while the other conditions remain unchanged.

[0118] Example 17 is based on the preparation method of Example 1, except that 25g of calcium stearate is replaced with a 35g mixture of 14g calcium stearate and 11g polyvinyl alcohol, while the other conditions remain unchanged.

[0119] The lightweight wall panels 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.

[0120] Table 5. Dosage and performance test results of calcium stearate, silicone amide, and polyvinyl alcohol in Examples 1 and 15-17.

[0121]

[0122] Referring to Table 5, a comparison of Examples 1 and 15-17 shows that the combination of calcium stearate and silicone amide exhibits the best overall performance when the three foam stabilizers are used in pairs. This is likely because silicone amide not only stabilizes bubbles but also interacts with other components in the wallboard material, such as condensed aluminum phosphate and water glass. This interaction helps form a more stable network structure, which enhances the overall stability within the wallboard. When silicone amide and calcium stearate are used in combination, they work together to improve the stability of the material from different perspectives.

[0123] Examples 18-21

[0124] Examples 18-21 are based on the preparation method of Example 15, but the mass ratio of calcium stearate and silicone amide in 25g of foam stabilizer mixture A is adjusted as shown in Table 6.

[0125] The lightweight wall panels with radiative cooling and high thermal resistance of Examples 18-21 were subjected to the above performance tests, and the test results are shown in Table 6.

[0126] Table 6. Mass ratio of calcium stearate and silicone amide in foam stabilizer mixture A of Examples 1, 15, and 18-21, and performance test results.

[0127]

[0128] Referring to Table 6, a comparison of Examples 1 and 18-21 shows that as the mass percentage of silicone amide in the foam stabilizer A increases, the compressive strength R0 and water resistance coefficient of the wall panel exhibit a trend of first increasing and then decreasing. This may be because, with the increasing mass percentage of silicone amide in the foam stabilizer A, silicone amide can gradually interact with other components in the wall panel material (such as condensed aluminum phosphate and water glass) 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 a certain range is exceeded, due to the relatively low content of calcium stearate, the synergistic effect of calcium stearate and silicone amide decreases, slightly reducing the compressive strength R0 of the wall panel, and further reducing the impermeability of the wall panel.

[0129] Examples 22-24

[0130] Example 22 is based on the preparation method of Example 1, except that 25g of calcium stearate is replaced with 25g of foam stabilizer mixture B. The mass ratio of calcium stearate, silicone amide and polyvinyl alcohol in foam stabilizer mixture B is 1:0.6:0.6, and the other conditions remain unchanged.

[0131] Examples 23-24 are based on the preparation method of Example 1, but the mass ratio of calcium stearate, silicone amide and polyvinyl alcohol in foam stabilizer B is adjusted as shown in Table 7.

[0132] The lightweight wall panels with radiative cooling and high thermal resistance of Examples 22-24 were subjected to the above performance tests, and the test results are shown in Table 7.

[0133] Table 7. Mass ratios of calcium stearate, silicone amide, and polyvinyl alcohol in foam stabilizer mixture B of Examples 1 and 22-24, and performance test results.

[0134]

[0135] Referring to Table 7, a comparison of Examples 1 and 22-24 shows that the foam stabilizer, a mixture of calcium stearate, silicone amide, and polyvinyl alcohol, can further improve the compressive strength and water resistance of the wall panel. This is because polyvinyl alcohol can form hydrogen bonds and other interactions with other components in the material, which enhance the structural stability of the bubbles and the wall panel as a whole. Polyvinyl alcohol can also fill tiny pores and cracks in the material, which are often channels for water penetration. By filling these channels, polyvinyl alcohol improves the wall panel's impermeability. When calcium stearate, silicone amide, and polyvinyl alcohol are used together, they can collectively improve the structural stability and impermeability of the wall panel from different perspectives. This synergistic effect allows the wall panel material to maintain a more uniform and stable bubble structure during preparation and curing, while simultaneously improving the overall strength and impermeability of the material.

[0136] Example 25

[0137] Example 25 is based on the preparation method of Example 22, but 35g of nano-silica is replaced with 35g of barium sulfate for adjustment. The specific adjustments are shown in Table 8.

[0138] The lightweight wall panels with radiative cooling and high thermal resistance of Examples 22 and 25 were subjected to the above performance tests, and the test results are shown in Table 8.

[0139] Table 8 Performance test results for Examples 1, 6, 22 and 25

[0140] project Example 1 Example 6 Example 22 Example 25 Summer energy consumption reduction percentage 17.3 16.1 17.4 22.8 Winter energy consumption reduction percentage 22.8 21.3 22.9 28.3 Reflectivity / % 80.4 79.5 80.5 83.8

[0141] Referring to Table 8, comparing Examples 1, 6, 22, and 25, it can be seen that foam stabilizer B, composed of a mixture of calcium stearate, silicone amide, and polyvinyl alcohol, combined with barium sulfate, can further improve the radiative cooling performance of the material. This is likely because polyvinyl alcohol is a high-molecular-weight compound with good adsorption and film-forming properties. In foam stabilizer B, polyvinyl alcohol can adsorb onto the surface of barium sulfate particles, forming a thin coating layer. This coating layer not only increases the steric hindrance between barium sulfate particles but also effectively reduces the interaction forces between particles, thereby preventing particle aggregation. When barium sulfate particles are less prone to aggregation, they can more fully exert their excellent radiative cooling performance.

[0142] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

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

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

3. The lightweight wall panel with radiative cooling and high thermal resistance according to claim 2, characterized in that: The radiation cooling material is nano-silica.

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

2.

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

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

7. The lightweight wall panel with radiative cooling and high thermal resistance 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 lightweight wall panel with radiative cooling and high thermal resistance according to claim 7, characterized in that: 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).

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

10. A method for preparing a lightweight wall panel with radiation cooling and high thermal resistance, characterized in that, The method for preparing a lightweight wall panel with radiative cooling and high thermal resistance as described in any one of claims 1-9 comprises the following steps: Mixing: Weigh out aluminum condensate, foam stabilizer, and radiation cooling material and mix them as composition A; weigh out water glass and hydroxyl silicone oil and mix them as composition B; pour composition B into composition A and stir to mix to obtain composition C; Foaming: Pour hydrogen peroxide into composition C, stir and mix to obtain a mixture; Shaping: The mixture is poured into a mold to harden and shape, resulting in a lightweight wall panel with radiative cooling and high thermal resistance.

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