Aerogel heat insulation inorganic dry powder real stone paint and preparation method thereof

Abstract

The invention relates to the technical field of real stone paint, in particular to aerogel heat insulation inorganic dry powder real stone paint and a preparation method thereof.The aerogel heat insulation inorganic dry powder real stone paint is prepared from calcined ceramic color sand, hydrophobic silicon dioxide aerogel powder, coarse whiting, rutile titanium dioxide, Portland cement, redispersible latex powder, cellulose ether, wood fiber, starch ether, a water repellent and a water reducing agent; and the paint is environment-friendly and non-toxic, and has A-grade fireproof performance. Efficient heat insulation is achieved by means of the thermal barrier advantage of aerogel; the formula is optimized, so that the strength, flexibility and adhesion of the coating are improved, and the problems of falling and cracking are solved; the additive ratio improves the constructability and storage stability, and the operation is simple and efficient.

Description

Technical Field

[0001] This invention relates to the field of stone paint technology, specifically to an aerogel thermal insulation inorganic dry powder stone paint and its preparation method. Background Technology

[0002] Global climate change and the energy crisis have become severe challenges facing human society. Building energy consumption accounts for as much as 40% of global total energy consumption, with refrigeration equipment accounting for more than 30% of total building energy consumption, making it one of the key factors exacerbating the global greenhouse effect. Especially in hot-summer and warm-winter regions of my country, the surface temperature of buildings after solar radiation often reaches 60-70°C in summer, leading to a sharp increase in air conditioning load. In some areas, air conditioning energy consumption has accounted for more than 50% of total building electricity consumption. Traditional active cooling methods rely on electric compressors, which not only consume a large amount of fossil fuels but also produce significant greenhouse gas emissions, forming a vicious cycle of "energy consumption-emissions-warming," which contradicts national strategic goals. Therefore, developing zero-energy passive cooling technology has become a cutting-edge direction in the field of building energy conservation.

[0003] Currently, common methods for building exterior wall insulation involve applying insulating mortar or installing insulation boards followed by painting. However, these methods pose serious safety hazards. Insulating mortar is prone to hollowing and cracking after prolonged use, and the insulation boards may not bond strongly to the wall, potentially leading to large-scale collapses that could cause injuries and threaten public safety. Stone-like paint, a coating that closely resembles marble and granite in appearance, is widely used in various building interiors and exteriors due to its advantages such as fire resistance, water resistance, acid and alkali resistance, pollution resistance, non-toxicity, odorlessness, strong adhesion, and colorfastness. However, ordinary stone-like paint lacks effective thermal insulation. Under strong solar radiation in summer, heat can easily be transferred to the interior through the coating, causing a significant increase in indoor temperature and failing to meet building energy conservation requirements.

[0004] Silica aerogel, with its unique nanoporous structure, extremely high specific surface area, and extremely low thermal conductivity, is hailed as a "miracle material that changes the world." When added as a functional filler to stone-like paint, it can significantly reduce the material's thermal conductivity through a thermal barrier effect, making it an ideal choice for achieving thermal insulation. However, the application of aerogel in stone-like paint still faces two major challenges: firstly, aerogel is inherently brittle, making it difficult to bond with the stone-like paint matrix and easily leading to coating cracking; secondly, aerogel has poor dispersion performance in aqueous systems and insufficient compatibility with film-forming materials, resulting in decreased impact resistance of the coating and limiting its large-scale application.

[0005] In summary, existing exterior wall insulation solutions pose safety hazards, ordinary stone-like paint lacks thermal insulation properties, and the technical challenges of aerogel-modified stone-like paint have not yet been effectively resolved. The construction industry urgently needs an inorganic dry powder stone-like paint that combines excellent thermal insulation performance, high bonding strength, resistance to peeling and cracking, and safety and environmental friendliness to meet building energy conservation requirements, ensure safe use, and contribute to the realization of national strategies. Summary of the Invention

[0006] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides an aerogel thermal insulation inorganic dry powder stone paint and its preparation method.

[0007] (II) Technical Solution An aerogel-based thermal insulation inorganic dry powder stone-like paint, by weight percentage, comprises: 65-75 parts calcined ceramic colored sand, 3-8 parts hydrophobic silica aerogel powder, 10-15 parts heavy calcium carbonate, 2-4 parts rutile titanium dioxide, 8-12 parts silicate cement, 1.5-3 parts redispersible latex powder, 0.2-0.4 parts cellulose ether (HPMC), 0.3-0.5 parts wood fiber, 0.03-0.06 parts starch ether, 0.1-0.3 parts water-repellent agent, and 0.2-0.5 parts water-reducing agent; the stone-like paint is in dry powder form, free of lumps and impurities, environmentally friendly and non-toxic, and has Class A fire resistance.

[0008] Preferably, the calcined ceramic colored sand is composed of fine sand and medium sand, with a weight ratio of fine sand to medium sand of 1:(1-3), a particle size of 80-120 mesh for the fine sand, and a particle size of 40-80 mesh for the medium sand.

[0009] Preferably, the hydrophobic silica aerogel powder has a thermal conductivity ≤0.025 W / (m·K), a hydrophobicity ≥99%, a specific surface area ≥600 m² / g, and a nanoporous structure with a pore size of 20–50 nm.

[0010] Preferably, the heavy calcium carbonate has a particle size of 400-800 mesh and a whiteness of ≥93%; the cellulose ether (HPMC) has a viscosity of 40,000-100,000 mPa·s and an ash content of ≤1.0%; the wood fiber has a length of 0.5 mm ± 0.1 mm and an oil absorption rate of ≥5.0 g / g; and the starch ether has a viscosity of 400-1200 mPa·s.

[0011] Preferably, the redispersible latex powder is redispersible latex powder 5044N, with a film-forming temperature ≤0℃ and water resistance ≥95%; the water-repellent agent is an organosilicon water-repellent powder with a solid content ≥98%; and the water-reducing agent is a powdered polycarboxylate water-reducing agent.

[0012] Preferably, the silicate cement is one or a mixture of two of PO425 grade white cement and PO425 grade gray cement.

[0013] Preferably, the preparation method of the aerogel thermal insulation inorganic dry powder stone paint includes the following steps: S1: Weigh all the raw materials according to the weight proportions described in claim 1. The raw materials need to be stored in a dry environment for more than 24 hours in advance, and the moisture content should be ≤0.5%. S2: Premix and dilute the trace additives with the large amount of filler. The trace additives include HPMC, starch ether, water repellent and water-reducing agent. The large amount of filler includes heavy calcium carbonate, rutile titanium dioxide and silicate cement. Premix until there are no obvious lumps to ensure that the trace additives are uniformly dispersed in the large amount of filler. S3: Add the premixed materials into the main mixer, and then add them in the following order: redispersible latex powder, wood fiber, calcined ceramic colored sand, and hydrophobic silica aerogel powder. Control the feeding speed to 5-10 kg / min to avoid dust flying. S4: Low-speed, gravity-free mixing and dispersion is adopted, with a mixing speed of 300-600 rpm and a mixing time of 30-45 min. During the mixing process, a gravity-free environment is maintained inside the mixer to avoid material agglomeration, thereby obtaining the inorganic dry powder stone paint.

[0014] Preferably, in step S2, the premixing is carried out using a ribbon mixer with a mixing speed of 150-200 rpm and a mixing time of 10-15 min, and the uniformity deviation of the mixing system is ≤3%.

[0015] Preferably, in step S3, the interval between the sequential addition of each component is 5 to 10 minutes; a closed feeding device is used when adding the hydrophobic silica aerogel powder to prevent the aerogel powder from flying away and being lost.

[0016] Preferably, the method of using the aerogel thermal insulation inorganic dry powder stone paint includes the following steps: S1: Level and clean the building walls, remove impurities, protrusions and dust from the wall surface, and ensure that the wall moisture content is ≤10% and the pH value is ≤10. S2: Mix the real stone paint with water at a weight ratio of 100:(22-25). The mixing ratio can be adjusted according to the ambient temperature. When the ambient temperature is below 10℃, the water ratio is 100:22-23. When the ambient temperature is above 30℃, the water ratio is 100:24-25. Stir with an electric mixer at low speed until a uniform paste without particles is formed. Let it stand and mature for 5-10 minutes, and then stir briefly for 1-2 minutes. S3: Use a special stone paint spray gun or trowel for construction. The nozzle diameter of the spray gun is 4-8mm, and the air pressure of the air compressor is kept stable at 0.6-0.8MPa. When spraying, ensure that the spray gun moves at a uniform speed and the thickness of each spray is 2-3mm. Avoid repeated spraying to prevent mottled appearance. When scraping, the trowel should be tilted at an angle of 30-45° to form a single layer. S4: Avoid rain and direct sunlight for 24 hours after construction. When the ambient temperature is below 5℃, take insulation and curing measures. 72 hours after construction, spray a special inorganic waterproof and breathable topcoat with a coverage rate of 0.1–0.2 kg / m². 2 .

[0017] (iii) Beneficial technical effects Compared with existing technologies, the beneficial effects of this invention are: 1. By rationally proportioning hydrophobic silica aerogel powder with other components, the thermal barrier advantages of the aerogel nanoporous structure are fully utilized to synergistically hinder the transfer of heat in the coating, significantly improving the passive cooling effect. This can effectively reduce the temperature difference between indoor and outdoor buildings, reduce air conditioning energy consumption, meet the requirements of building energy conservation and strategic planning, and provide long-term and stable thermal insulation for buildings.

[0018] 2. With calcined ceramic colored sand as the main component, combined with redispersible latex powder, wood fiber and other components, it not only ensures the structural strength of the coating, but also gives it good flexibility and adhesion, solving the safety hazards of traditional thermal insulation materials falling off; at the same time, the capillary effect of wood fiber can reduce the skin formation of the slurry, further improving the crack resistance of the coating and extending its service life.

[0019] 3. The scientific formulation of additives such as cellulose ether and starch ether not only improves the lubricity and leveling properties of the stone paint, reduces spraying resistance, and enhances the ease of construction, but also effectively prevents problems such as stratification, sedimentation, and water loss during long-term storage, ensuring its performance stability. Moreover, the product is in dry powder form and can be stored for a long time in a sealed, dry, and cool place. It only needs to be mixed with water before use, making the operation simple and efficient. Attached Figure Description

[0020] Figure 1 This is a flowchart of a method for preparing aerogel thermal insulation inorganic dry powder stone paint proposed in this invention; Figure 2 This is a line graph comparing the thermal conductivity of the embodiment and the comparative example; Figure 3 This is a bar chart comparing the oxygen index and hydrophobicity of the examples and comparative examples; Figure 4 This is a line graph comparing the water resistance and alkali resistance of the examples and comparative examples. Detailed Implementation

[0021] according to Figures 1 to 4 The specific embodiments of the present invention are as follows: The following detailed description, in conjunction with specific embodiments and comparative examples, illustrates the aerogel thermal insulation inorganic dry powder stone paint of the present invention, its preparation method, and its application method. All raw materials used in this embodiment are commercially available qualified products. Unless otherwise specified, all operations were conducted in a conventional laboratory or industrial production environment. All testing items were performed in accordance with relevant national standards. The environmental protection and non-toxic properties comply with GB 18582-2020 "Limits of Hazardous Substances in Building Wall Coatings," and the Class A fire resistance performance complies with GB 8624-2012 "Classification of Burning Performance of Building Materials and Products." Example 1

[0022] (a) Aerogel thermal insulation inorganic dry powder stone paint components (by weight) 70 parts of calcined ceramic colored sand, composed of fine sand and medium sand in a weight ratio of 1:2, with fine sand having a particle size of 100 mesh and medium sand having a particle size of 60 mesh, are produced by calcining at 1200℃ for 3 hours, resulting in a uniform color without impurities; Five parts of hydrophobic silica aerogel powder have a thermal conductivity of 0.022 W / (m·K), a hydrophobicity of 99.5%, a specific surface area of ​​650 m² / g, a nanoporous structure with a pore size of 30 nm, and an appearance of white fluffy powder. 12 parts of heavy calcium carbonate, 600 mesh particle size, 95% whiteness, no obvious impurities, and uniform particle size distribution; 3 parts of rutile titanium dioxide, whiteness ≥98%, hiding power ≥10g / m², and excellent dispersibility. 10 parts of silicate cement, using PO425 grade white cement, with an initial setting time ≥45min, a final setting time ≤600min, and a strength grade conforming to GB 175-2007 standard; Two parts of redispersible latex powder, model 5044N, film-forming temperature -2℃, water resistance 96%, solid content ≥98%; Cellulose ether HPMC 0.3 parts, viscosity 60,000 mPa·s, ash content 0.8%, degree of substitution 1.8, water-insoluble matter ≤0.5%; Wood fiber content: 0.4 parts, length: 0.5mm ± 0.05mm, oil absorption rate: 5.5g / g, ash content: ≤1.5%, fiber is uniform and free of lumps; Starch ether 0.04 parts, viscosity 800 mPa.s, whiteness ≥90%, gelatinization temperature 65℃, good flowability; 0.2 parts of water-repellent agent, organosilicon water-repellent agent powder, solid content 99%, particle size ≤10μm, long-lasting water-repellent effect; 0.3 parts of water-reducing agent, powdered polycarboxylate water-reducing agent, water reduction rate ≥25%, chloride ion content ≤0.1%, good compatibility with cement.

[0023] (II) Preparation method S1 Raw Material Preparation: Accurately weigh all component raw materials according to the above weight proportions, and store the raw materials in a dry warehouse at a temperature of 25℃ and a humidity of ≤50% for 26 hours. After testing, the moisture content of each raw material is ≤0.4%, which meets the usage requirements. Weighing is carried out using an electronic platform scale with an accuracy of 0.01kg to ensure that the weighing error is ≤±0.1%.

[0024] S2 Premixed Dilution: Add trace amounts of additives (0.3 parts of cellulose ether HPMC, 0.04 parts of starch ether, 0.2 parts of water-repellent agent, and 0.3 parts of water-reducing agent) and a large amount of filler (12 parts of heavy calcium carbonate, 3 parts of rutile titanium dioxide, and 10 parts of silicate cement) to a ribbon mixer. Set the mixing speed to 180 rpm and the mixing time to 12 min. Observe the material state every 3 min during the mixing process to ensure that there is no obvious clumping. After the mixing is completed, the uniformity deviation of the mixing system is measured to be 2.2%.

[0025] S3 Material Feeding: Put all the premixed materials into the zero-gravity main mixer and let them stand for 5 minutes to allow the materials to spread naturally. Then, add the redispersible latex powder, wood fiber, calcined ceramic sand, and hydrophobic silica aerogel powder in sequence, controlling the feeding speed at 8 kg / min and the interval between each component addition at 8 minutes. The hydrophobic silica aerogel powder is fed using a closed spiral feeding device, with the feeding port sealed to the mixer inlet to prevent the aerogel powder from flying away and being lost. After feeding, close the sealing cover.

[0026] S4 Mixing and Stirring: Start the main mixer and adopt the low-speed zero-gravity mixing and stirring mode. Set the stirring speed to 450 rpm and the stirring time to 38 min. During the stirring process, monitor the material status in real time through the mixer's observation window to ensure that the mixer maintains a zero-gravity suspension environment and avoids material agglomeration. After the stirring is completed, stop the machine and let it stand for 3 minutes before opening the discharge port to obtain dry powder aerogel thermal insulation inorganic dry powder stone paint. The product is free of lumps and impurities.

[0027] (III) Instructions for Use S1 Wall Treatment: A 2m straightedge was used to test the level of the building wall. Protruding parts were ground smooth with an angle grinder, and recessed parts were repaired with polymer cement mortar. After repair, the wall was cured for 24 hours. The wall surface was washed with a high-pressure water gun to remove impurities, dust and oil stains, and then wiped clean with a dry cloth. The wall moisture content was found to be 8% and the pH value was 9.2.

[0028] S2 Material Preparation: On an ambient temperature of 25℃, mix the prepared stone paint with tap water at a weight ratio of 100:23.5. First, pour the water into the mixing bucket, then slowly add the stone paint powder. Use an electric mixer to stir at low speed for 8 minutes until a uniform paste without particles is formed. Place the stirred paste in a cool place to stand and mature for 8 minutes, and then stir briefly with a mixer for 1.5 minutes to ensure material consistency.

[0029] S3 Construction Operation: Use a special stone paint spray gun with a nozzle diameter of 6mm. Connect the air compressor and adjust the air pressure to be stable at 0.7MPa. The construction worker holds the spray gun at a distance of 30cm from the wall surface and moves the spray gun in a straight line at a uniform speed of 0.5m / s. The thickness of a single spray is 2.5mm. The thickness is monitored in real time using a wet film thickness gauge to avoid repeated spraying that may cause uneven coloring. For local corners, use a putty knife with an angle of 38° to scrape the paint in one go. After scraping, gently press it flat with the back of the putty knife.

[0030] S4 Curing and Topcoat: After construction, cover the wall surface with a breathable curing membrane and avoid rain and sun exposure for 24 hours. Keep the ambient temperature between 15-28℃. 72 hours after construction, spray a special inorganic waterproof and breathable topcoat using the air spraying method. The topcoat application rate is controlled at 0.15 kg / m². Ensure that the coating is uniform and without any missed spots during spraying. The surface can be put into use after curing for 48 hours. Example 2

[0031] (a) Aerogel thermal insulation inorganic dry powder stone paint components (by weight) 65 parts of calcined ceramic colored sand, composed of fine sand and medium sand in a weight ratio of 1:1, with fine sand having a particle size of 80 mesh and medium sand having a particle size of 40 mesh, were prepared by calcining at 1150℃ for 4 hours; Three parts of hydrophobic silica aerogel powder, with a thermal conductivity of 0.025 W / (m·K), a hydrophobicity of 99.0%, a specific surface area of ​​600 m² / g, and a nanoporous structure with a pore size of 20 nm; 10 parts of heavy calcium carbonate, 400 mesh particle size, 93% whiteness; 2 parts of rutile titanium dioxide, whiteness ≥97%, hiding power ≥12g / m²; Eight parts of silicate cement, using PO425 grade gray cement, with an initial setting time ≥50min and a final setting time ≤580min; 1.5 parts of redispersible latex powder, model 5044N, film-forming temperature 0℃, water resistance 95%; Cellulose ether HPMC 0.2 parts, viscosity 40,000 mPa·s, ash content 0.9%; Wood fiber 0.3 parts, length 0.5mm±0.1mm, oil absorption rate 5.0g / g; Starch ether 0.03 parts, viscosity 400 mPa.s, gelatinization temperature 68℃; 0.1 parts of water-repellent agent, silicone water-repellent powder, solid content 98%; 0.2 parts of water-reducing agent, powdered polycarboxylate water-reducing agent, water reduction rate ≥22%.

[0032] (II) Preparation method S1 Raw material preparation: Weigh each component accurately according to the weight parts, and store the raw materials in a dry environment with a temperature of 23℃ and a humidity of ≤48% for 24 hours. The moisture content of all raw materials is tested to be 0.35%. Weighing is done using an electronic platform scale with an accuracy of 0.01kg to ensure that the weighing error is ≤±0.08%.

[0033] S2 Premixed Dilution: Add trace amounts of additives (0.2 parts of cellulose ether HPMC, 0.03 parts of starch ether, 0.1 parts of water-repellent agent, and 0.2 parts of water-reducing agent) and a large amount of filler (10 parts of heavy calcium carbonate, 2 parts of rutile titanium dioxide, and 8 parts of silicate cement) to a ribbon mixer. Set the mixing speed to 150 rpm and the mixing time to 10 min. Observe the material state every 3 min during the mixing process to ensure that there is no obvious clumping. After the mixing is completed, the uniformity deviation of the mixing system is 2.8%, which meets the requirements.

[0034] S3 Material Feeding: Put all the premixed materials into the zero-gravity main mixer and let them stand for 5 minutes to allow the materials to spread naturally. Then, add the redispersible latex powder, wood fiber, calcined ceramic sand, and hydrophobic silica aerogel powder in sequence, controlling the feeding speed at 5 kg / min and the interval between each component addition at 5 minutes. The hydrophobic silica aerogel powder is fed using a closed spiral feeding device, with the feeding port sealed to the mixer inlet to prevent the aerogel powder from flying away and being lost. After feeding is completed, close the sealing cover.

[0035] S4 Mixing and Stirring: Start the main mixer and adopt the low-speed zero-gravity mixing and stirring mode. Set the stirring speed to 300 rpm and the stirring time to 30 min. During the stirring process, monitor the material status in real time through the mixer's observation window to ensure that the mixer maintains a zero-gravity suspension environment and avoids material agglomeration. After the stirring is completed, stop the machine and let it stand for 3 minutes before opening the discharge port to obtain dry powder aerogel thermal insulation inorganic dry powder stone paint. The product is free of lumps and impurities.

[0036] (III) Instructions for Use 1. S1 Wall Treatment: A 2m straightedge was used to test the level of the building wall. Protruding parts were ground smooth with an angle grinder, and recessed parts were repaired with polymer cement mortar. After repair, the wall was cured for 24 hours. The wall surface was rinsed with a high-pressure water gun (0.3MPa) to remove impurities, dust and oil stains, and then wiped clean with a dry cloth. The wall moisture content was found to be 7% and the pH value was 8.8, which met the construction requirements.

[0037] S2 Material Preparation: On an ambient temperature of 18℃, mix the prepared stone paint with tap water at a weight ratio of 100:22.8. First, pour the water into the mixing bucket, then slowly add the stone paint powder. Use an electric mixer (500 rpm) to stir at low speed for 7 minutes until a uniform, particle-free paste is formed. Place the stirred paste in a cool place to stand and mature for 5 minutes, then stir briefly with the mixer for 1 minute to ensure material consistency.

[0038] S3 Construction Operation: Use a special stone paint spray gun with a nozzle diameter of 4mm. Connect the air compressor and adjust the air pressure to be stable at 0.6MPa. The construction worker holds the spray gun at a distance of 30cm from the wall surface and moves the spray gun in a straight line at a uniform speed of 0.4m / s. The thickness of a single spray is 2mm. The thickness is monitored in real time using a wet film thickness gauge to avoid repeated spraying that may cause uneven coloring. For local corners, use a putty knife with a 30° angle to scrape the paint in one go. After scraping, gently press it flat with the back of the putty knife.

[0039] S4 Curing and Topcoat: After construction, cover the wall surface with a breathable curing membrane and avoid rain and sun exposure for 24 hours. Keep the ambient temperature between 15-28℃. 72 hours after construction, spray a special inorganic waterproof and breathable topcoat using the air spraying method. The topcoat application rate is controlled at 0.1 kg / m². Ensure the coating is uniform and without any missed spots during spraying. The surface can be put into use after curing for 48 hours. Example 3

[0040] (a) Aerogel thermal insulation inorganic dry powder stone paint components (by weight) 75 parts of calcined ceramic colored sand, composed of fine sand and medium sand in a weight ratio of 1:3, with fine sand having a particle size of 120 mesh and medium sand having a particle size of 80 mesh, were prepared by calcining at 1250℃ for 2.5 hours; Eight parts of hydrophobic silica aerogel powder, with a thermal conductivity of 0.020 W / (m·K), a hydrophobicity of 99.8%, a specific surface area of ​​700 m² / g, and a nanoporous structure with a pore size of 50 nm; 15 parts of heavy calcium carbonate, 800 mesh particle size, 96% whiteness; 4 parts of rutile titanium dioxide, whiteness ≥99%, hiding power ≥9g / m²; 12 parts of silicate cement, made by mixing PO425 grade white cement and PO425 grade gray cement at a weight ratio of 1:1, with an initial setting time ≥45min and a final setting time ≤600min; 3 parts redispersible latex powder, model 5044N, film-forming temperature -3℃, water resistance 98%; Cellulose ether HPMC 0.4 parts, viscosity 100,000 mPa·s, ash content 0.7%; Wood fiber 0.5 parts, length 0.5mm±0.05mm, oil absorption rate 6.0g / g; Starch ether 0.06 parts, viscosity 1200 mPa.s, gelatinization temperature 62℃; 0.3 parts of water-repellent agent, silicone water-repellent powder, solid content 99.5%; 0.5 parts of water-reducing agent, powdered polycarboxylate water-reducing agent, water reduction rate ≥28%.

[0041] (II) Preparation method S1 Raw material preparation: Weigh each component accurately by weight, and store the raw materials in a dry environment at 26℃ and ≤45% humidity for 28 hours. The moisture content is tested to be ≤0.3%. Weighing is done using an electronic platform scale with an accuracy of 0.01kg to ensure that the weighing error is ≤±0.05%.

[0042] S2 Premixed Dilution: Add trace amounts of additives (0.4 parts of cellulose ether HPMC, 0.06 parts of starch ether, 0.3 parts of water-repellent agent, and 0.5 parts of water-reducing agent) and a large amount of filler (15 parts of heavy calcium carbonate, 4 parts of rutile titanium dioxide, and 12 parts of silicate cement) to a ribbon mixer. Set the mixing speed to 200 rpm and the mixing time to 15 min. Observe the material state every 3 min during the mixing process to ensure that there is no obvious clumping. After the mixing is completed, the uniformity deviation of the mixing system is tested and found to be 1.8%.

[0043] S3 Material Feeding: Put all the premixed materials into the zero-gravity main mixer and let them stand for 5 minutes to allow the materials to spread naturally. Then, add the redispersible latex powder, wood fiber, calcined ceramic sand, and hydrophobic silica aerogel powder in sequence, controlling the feeding speed at 10 kg / min and the interval between each component addition at 10 minutes. The hydrophobic silica aerogel powder is fed using a closed spiral feeding device, with the feeding port sealed to the mixer inlet to prevent the aerogel powder from flying away and being lost. After feeding, close the sealing cover.

[0044] S4 Mixing and Stirring: Start the main mixer and adopt the low-speed zero-gravity mixing and stirring mode. Set the stirring speed to 600 rpm and the stirring time to 45 min. During the stirring process, monitor the material status in real time through the mixer's observation window to ensure that the mixer maintains a zero-gravity suspension environment and avoids material agglomeration. After the stirring is completed, stop the machine and let it stand for 3 minutes before opening the discharge port to obtain dry powder aerogel thermal insulation inorganic dry powder stone paint. The product is free of lumps and impurities.

[0045] (III) Instructions for Use S1 Wall Treatment: A 2m straightedge was used to test the level of the building wall. Protruding parts were ground smooth with an angle grinder, and recessed parts were repaired with polymer cement mortar. After repair, the wall was cured for 24 hours. The wall surface was rinsed with a high-pressure water gun (0.3MPa) to remove impurities, dust and oil stains, and then wiped clean with a dry cloth. The wall moisture content was found to be 9% and the pH value was 9.5, which met the construction requirements.

[0046] S2 Material Preparation: On the day of preparation, the ambient temperature is 32℃. Mix the prepared stone paint with tap water at a weight ratio of 100:24.5. First, pour the water into the mixing bucket, then slowly add the stone paint powder. Use an electric mixer (500 rpm) to stir at low speed for 10 minutes until a uniform paste without particles is formed. Place the stirred paste in a cool place to stand and mature for 10 minutes, and then stir briefly with the mixer for 2 minutes to ensure the consistency of the material.

[0047] S3 Construction Operation: Use a special stone paint spray gun with an 8mm nozzle. Connect the air compressor and adjust the air pressure to a stable 0.8MPa. The construction worker holds the spray gun at a distance of 30cm from the wall surface and moves the spray gun in a straight line at a uniform speed of 0.6m / s. The thickness of a single spray is 3mm. The thickness is monitored in real time using a wet film thickness gauge to avoid repeated spraying that may cause uneven coloring. For local corners, use a putty knife at a 45° angle to scrape the paint in one go. After scraping, gently press it flat with the back of the putty knife.

[0048] S4 Curing and Topcoat: After construction, cover the wall surface with a breathable curing membrane and avoid rain and sun exposure for 24 hours. Keep the ambient temperature between 15-28℃. 72 hours after construction, spray a special inorganic waterproof and breathable topcoat using the air spraying method. The topcoat application rate is controlled at 0.2 kg / m². Ensure the coating is uniform and without any missed spots during spraying. The surface can be put into use after curing for 48 hours.

[0049] IV. Example 4 (a) Aerogel thermal insulation inorganic dry powder stone paint components (by weight) 68 parts of calcined ceramic colored sand, composed of fine sand and medium sand in a weight ratio of 1:1.5, with fine sand having a particle size of 90 mesh and medium sand having a particle size of 50 mesh, were prepared by calcining at 1180℃ for 3.5 hours; Four parts of hydrophobic silica aerogel powder, with a thermal conductivity of 0.023 W / (m·K), a hydrophobicity of 99.3%, a specific surface area of ​​630 m² / g, and a nanoporous structure with a pore size of 25 nm; 11 parts of heavy calcium carbonate, 500 mesh particle size, 94% whiteness; 2.5 parts of rutile titanium dioxide, 98% whiteness, 11 g / m² hiding power; Nine parts of silicate cement, using PO425 grade white cement, with an initial setting time ≥48min and a final setting time ≤590min; 1.8 parts of redispersible latex powder, model 5044N, film-forming temperature -1℃, water resistance 97%; Cellulose ether HPMC 0.25 parts, viscosity 50,000 mPa·s, ash content 0.85%; Wood fiber content: 0.35 parts, length: 0.5mm ± 0.08mm, oil absorption rate: 5.2g / g; Starch ether 0.035 parts, viscosity 600 mPa.s, gelatinization temperature 66℃; 0.15 parts of water-repellent agent, organosilicon water-repellent agent powder, solid content 98.5%; 0.35 parts of water-reducing agent, powdered polycarboxylate water-reducing agent, water reduction rate 24%.

[0050] (II) Preparation method S1 Raw material preparation: Weigh each component accurately by weight, and store the raw materials in a dry environment at 24℃ and 47% humidity for 25 hours. The moisture content is tested to be 0.42%. Weighing is done using an electronic platform scale with an accuracy of 0.01kg to ensure that the weighing error is ≤±0.09%.

[0051] S2 Premixed Dilution: Add trace amounts of additives (0.25 parts of cellulose ether HPMC, 0.035 parts of starch ether, 0.15 parts of water-repellent agent, and 0.35 parts of water-reducing agent) and a large amount of filler (11 parts of heavy calcium carbonate, 2.5 parts of rutile titanium dioxide, and 9 parts of silicate cement) to a ribbon mixer. Set the mixing speed to 160 rpm and the mixing time to 11 min. Observe the material state every 3 min during the mixing process to ensure that there is no obvious clumping. After the mixing is completed, the uniformity deviation of the mixing system is 2.5%, which meets the requirements.

[0052] S3 Material Feeding: Put all the premixed materials into the zero-gravity main mixer and let them stand for 5 minutes to allow the materials to spread naturally. Then, add the redispersible latex powder, wood fiber, calcined ceramic colored sand, and hydrophobic silica aerogel powder in sequence, controlling the feeding speed at 6 kg / min and the interval between each component addition at 6 minutes. The hydrophobic silica aerogel powder is fed using a closed spiral feeding device, with the feeding port sealed to the mixer inlet to prevent the aerogel powder from flying away and being lost. After feeding is completed, close the sealing cover.

[0053] S4 Mixing and Stirring: Start the main mixer and adopt the low-speed zero-gravity mixing and stirring mode. Set the stirring speed to 380 rpm and the stirring time to 32 min. During the stirring process, monitor the material status in real time through the mixer's observation window to ensure that the mixer maintains a zero-gravity suspension environment and avoids material agglomeration. After the stirring is completed, stop the machine and let it stand for 3 minutes before opening the discharge port to obtain dry powder aerogel thermal insulation inorganic dry powder stone paint. The product is free of lumps and impurities.

[0054] (III) Instructions for Use S1 Wall Treatment: A 2m straightedge was used to test the level of the building wall. Protruding parts were ground smooth with an angle grinder, and recessed parts were repaired with polymer cement mortar. After repair, the wall was cured for 24 hours. The wall surface was rinsed with a high-pressure water gun (0.3MPa) to remove impurities, dust and oil stains, and then wiped clean with a dry cloth. The wall moisture content was found to be 8.5% and the pH value was 9.0.

[0055] S2 Material Preparation: On the day of preparation, the ambient temperature is 28℃. Mix the prepared stone paint with tap water at a weight ratio of 100:24. First, pour the water into the mixing bucket, then slowly add the stone paint powder. Use an electric mixer (500 rpm) to stir at low speed for 9 minutes until a uniform paste without particles is formed. Place the stirred paste in a cool place to stand and mature for 7 minutes, and then stir briefly with the mixer for 1.2 minutes to ensure the consistency of the material.

[0056] S3 Construction Operation: Use a special stone paint spray gun with a nozzle diameter of 5mm. Connect the air compressor and adjust the air pressure to be stable at 0.65MPa. The construction worker holds the spray gun at a distance of 30cm from the wall surface and moves the spray gun in a straight line at a uniform speed of 0.45m / s. The thickness of a single spray is 2.2mm. The thickness is monitored in real time using a wet film thickness gauge to avoid repeated spraying that may cause uneven coloring. For local corners, use a putty knife with a 35° angle to scrape the paint in one go. After scraping, gently press it flat with the back of the putty knife.

[0057] S4 Curing and Topcoat: After construction, cover the wall surface with a breathable curing membrane and avoid rain and sun exposure for 24 hours. Keep the ambient temperature between 15-28℃. 72 hours after construction, spray a special inorganic waterproof and breathable topcoat using the air spraying method. The topcoat application rate is controlled at 0.13 kg / m². Ensure the coating is uniform and without any missed spots during spraying. The surface can be put into use after curing for 48 hours. Example 5

[0058] (a) Aerogel thermal insulation inorganic dry powder stone paint components (by weight) 72 parts of calcined ceramic colored sand, composed of fine sand and medium sand in a weight ratio of 1:2.5, with fine sand having a particle size of 110 mesh and medium sand having a particle size of 70 mesh, were prepared by calcining at 1220℃ for 2.8 hours; Six parts of hydrophobic silica aerogel powder have a thermal conductivity of 0.021 W / (m·K), a hydrophobicity of 99.6%, a specific surface area of ​​680 m² / g, and a nanoporous structure with a pore size of 40 nm. 13 parts of heavy calcium carbonate, 700 mesh particle size, 95.5% whiteness; 3.5 parts of rutile titanium dioxide, 98.5% whiteness, 10 g / m² hiding power; 11 parts of silicate cement, using PO425 grade gray cement, with an initial setting time ≥46min and a final setting time ≤595min; 2.5 parts of redispersible latex powder, model 5044N, film-forming temperature -2.5℃, water resistance 97.5%; 0.35 parts of cellulose ether HPMC, viscosity 80,000 mPa·s, ash content 0.75%; Wood fiber content: 0.45 parts, length: 0.5 mm ± 0.06 mm, oil absorption rate: 5.8 g / g; Starch ether 0.05 parts, viscosity 1000 mPa.s, gelatinization temperature 64℃; 0.25 parts of water-repellent agent, organosilicon water-repellent agent powder, solid content 99.2%; 0.45 parts of water-reducing agent, powdered polycarboxylate water-reducing agent, water reduction rate 26%.

[0059] (II) Preparation method S1 Raw material preparation: Weigh each component accurately by weight, and store the raw materials in a dry environment at 27℃ and 43% humidity for 27 hours. The moisture content is tested to be 0.38%. Weighing is done using an electronic platform scale with an accuracy of 0.01kg to ensure that the weighing error is ≤±0.06%.

[0060] S2 Premixed Dilution: Add trace amounts of additives (0.35 parts of cellulose ether HPMC, 0.05 parts of starch ether, 0.25 parts of water-repellent agent, and 0.45 parts of water-reducing agent) and a large amount of filler (13 parts of heavy calcium carbonate, 3.5 parts of rutile titanium dioxide, and 11 parts of silicate cement) to a ribbon mixer. Set the mixing speed to 190 rpm and the mixing time to 14 min. Observe the material state every 3 min during the mixing process to ensure that there is no obvious clumping. After the mixing is completed, the uniformity deviation of the mixing system is tested and found to be 2.0%, which meets the requirements.

[0061] S3 Material Feeding: Put all the premixed materials into the zero-gravity main mixer and let them stand for 5 minutes to allow the materials to spread naturally. Then, add the redispersible latex powder, wood fiber, calcined ceramic colored sand, and hydrophobic silica aerogel powder in sequence, controlling the feeding speed at 9 kg / min and the interval between each component addition at 9 minutes. The hydrophobic silica aerogel powder is fed using a closed spiral feeding device, with the feeding port sealed to the mixer inlet to prevent the aerogel powder from flying away and being lost. After feeding, close the sealing cover.

[0062] S4 Mixing and Stirring: Start the main mixer and adopt the low-speed zero-gravity mixing and stirring mode. Set the stirring speed to 550 rpm and the stirring time to 42 min. During the stirring process, monitor the material status in real time through the mixer's observation window to ensure that the mixer maintains a zero-gravity suspension environment and avoids material agglomeration. After the stirring is completed, stop the machine and let it stand for 3 minutes before opening the discharge port to obtain dry powder aerogel thermal insulation inorganic dry powder stone paint. The product is free of lumps and impurities.

[0063] (III) Instructions for Use S1 Wall Treatment: A 2m straightedge was used to test the level of the building wall. Protruding parts were ground smooth with an angle grinder, and recessed parts were repaired with polymer cement mortar. After repair, the wall was cured for 24 hours. The wall surface was rinsed with a high-pressure water gun (0.3MPa) to remove impurities, dust and oil stains, and then wiped clean with a dry cloth. The wall moisture content was tested to be 7.5% and the pH value was 9.3, which met the construction requirements.

[0064] S2 Material Preparation: The ambient temperature on the day is 22℃. Mix the prepared stone paint with tap water at a weight ratio of 100:23. First, pour the water into the mixing bucket, then slowly add the stone paint powder. Use an electric mixer (500 rpm) to stir at low speed for 8.5 minutes until a uniform paste without particles is formed. Place the stirred paste in a cool place to stand and mature for 9 minutes, and then stir briefly with a mixer for 1.8 minutes to ensure the consistency of the material.

[0065] S3 Construction Operation: Use a special stone paint spray gun with a nozzle diameter of 7mm. Connect the air compressor and adjust the air pressure to be stable at 0.75MPa. The construction worker holds the spray gun at a distance of 30cm from the wall surface and moves the spray gun in a straight line at a uniform speed of 0.55m / s. The thickness of a single spray is 2.8mm. The thickness is monitored in real time using a wet film thickness gauge to avoid repeated spraying that may cause uneven coloring. For local corners, use a putty knife with an angle of 42° to scrape the paint in one go. After scraping, gently press it flat with the back of the putty knife.

[0066] S4 Curing and Topcoat: After construction, cover the wall surface with a breathable curing membrane and avoid rain and sun exposure for 24 hours. Keep the ambient temperature between 15-28℃. 72 hours after construction, spray a special inorganic waterproof and breathable topcoat using the air spraying method. The topcoat application rate is controlled at 0.18 kg / m². Ensure the coating is uniform and without any missed spots during spraying. The surface can be put into use after curing for 48 hours.

[0067] Comparative Example 1 (a) Components (by weight) 70 parts of calcined ceramic colored sand, composed of fine sand and medium sand in a weight ratio of 1:2, with fine sand having a particle size of 100 mesh and medium sand having a particle size of 60 mesh, are produced by calcining at 1200℃ for 3 hours; 17 parts of heavy calcium carbonate, 600 mesh particle size, 95% whiteness; 3 parts of rutile titanium dioxide, whiteness ≥98%, hiding power ≥10g / m²; 10 parts of silicate cement, using PO425 grade white cement, with an initial setting time ≥45min and a final setting time ≤600min; 2 parts redispersible latex powder, model 5044N, film-forming temperature -2℃, water resistance 96%; Cellulose ether HPMC 0.3 parts, viscosity 60,000 mPa·s, ash content 0.8%; Wood fiber 0.4 parts, length 0.5mm±0.05mm, oil absorption rate 5.5g / g; Starch ether 0.04 parts, viscosity 800 mPa.s, gelatinization temperature 65℃; 0.2 parts of water-repellent agent, organosilicon water-repellent agent powder, solid content 99%; 0.3 parts of water-reducing agent, powdered polycarboxylate water-reducing agent, water reduction rate ≥25%.

[0068] (II) Preparation method S1 Raw material preparation: Weigh each component accurately by weight, and store the raw materials in a dry warehouse at 25℃ and ≤50% humidity for 26 hours. The moisture content of each raw material is tested to be ≤0.4%. Weighing is done using an electronic platform scale with an accuracy of 0.01kg to ensure that the weighing error is ≤±0.1%.

[0069] S2 Premixed Dilution: Add trace amounts of additives (0.3 parts of cellulose ether HPMC, 0.04 parts of starch ether, 0.2 parts of water-repellent agent, and 0.3 parts of water-reducing agent) and a large amount of filler (17 parts of heavy calcium carbonate, 3 parts of rutile titanium dioxide, and 10 parts of silicate cement) to a ribbon mixer. Set the mixing speed to 180 rpm and the mixing time to 12 min. Observe the material state every 3 min during the mixing process to ensure that there is no obvious clumping. After the mixing is completed, the uniformity deviation of the mixing system is 2.2%, which meets the requirements.

[0070] S3 Material Feeding: Put all the premixed materials into the zero-gravity main mixer and let it stand for 5 minutes to allow the materials to spread naturally. Then add the redispersible latex powder, wood fiber and calcined ceramic colored sand in sequence, controlling the feeding speed at 8 kg / min and the interval between each component addition at 8 minutes. After the feeding is completed, close the sealing cover.

[0071] S4 Mixing and Stirring: Start the main mixer and adopt the low-speed zero-gravity mixing and stirring mode. Set the stirring speed to 450 rpm and the stirring time to 38 min. During the stirring process, monitor the material status in real time through the mixer's observation window to ensure that the mixer maintains a zero-gravity suspension environment and avoids material agglomeration. After the stirring is completed, stop the machine, let it stand for 3 minutes, and then open the discharge port to obtain dry powdered stone paint. The product is free of lumps and impurities.

[0072] (III) Instructions for Use S1 Wall Treatment: The building wall was leveled using a 2m straightedge. Protruding parts were ground smooth with an angle grinder, and recessed parts were repaired with polymer cement mortar. After repair, the wall was cured for 24 hours. The wall surface was rinsed with a high-pressure water gun (0.3MPa) to remove impurities, dust and oil stains, and then wiped clean with a dry cloth. The wall moisture content was found to be 8% and the pH value was 9.2.

[0073] S2 Material Preparation: On an ambient temperature of 25℃, mix the prepared stone paint with tap water at a weight ratio of 100:23.5. First, pour the water into the mixing bucket, then slowly add the stone paint powder. Use an electric mixer (500 rpm) to stir at low speed for 8 minutes until a uniform, particle-free paste is formed. Place the stirred paste in a cool place to stand and mature for 8 minutes, then stir briefly with the mixer for 1.5 minutes to ensure material consistency.

[0074] S3 Construction Operation: Use a special stone paint spray gun with a nozzle diameter of 6mm. Connect the air compressor and adjust the air pressure to be stable at 0.7MPa. The construction worker holds the spray gun at a distance of 30cm from the wall surface and moves the spray gun in a straight line at a uniform speed of 0.5m / s. The thickness of a single spray is 2.5mm. The thickness is monitored in real time using a wet film thickness gauge to avoid repeated spraying that may cause uneven coloring. For local corners, use a putty knife with an angle of 38° to scrape the paint in one go. After scraping, gently press it flat with the back of the putty knife.

[0075] S4 Curing and Topcoat: After construction, cover the wall surface with a breathable curing membrane and avoid rain and sun exposure for 24 hours. Keep the ambient temperature between 15-28℃. 72 hours after construction, spray a special inorganic waterproof and breathable topcoat using the air spraying method. The topcoat application rate is controlled at 0.15 kg / m². Ensure that the coating is uniform and without any missed spots during spraying. The surface can be put into use after curing for 48 hours.

[0076] Comparative Example 2 (Traditional Stone Paint Formulation and Preparation Method) (a) Components (by weight) 70 parts of ordinary natural colored sand, composed of fine sand and medium sand in a weight ratio of 1:2, with fine sand particle size of 80-100 mesh and medium sand particle size of 40-60 mesh, and not subjected to calcination treatment; 15 parts of triple calcium carbonate, 300 mesh particle size, 90% whiteness; Two parts of rutile titanium dioxide, with whiteness ≥95% and hiding power ≥15g / m²; 12 parts of ordinary Portland cement, strength grade 32.5, initial setting time ≥40min, final setting time ≤650min; One part redispersible latex powder, film-forming temperature 5℃, water resistance 85%; Hydroxypropyl methylcellulose 0.2 parts, viscosity 30,000 mPa·s, ash content ≤2.0%; 0.3 parts short fibers, length 1mm±0.2mm, oil absorption rate 3.0g / g; 0.03 parts of ordinary starch ether, viscosity 300 mPa·s; Paraffin-based water-repellent agent, 0.15 parts, solid content 90%; 0.2 parts of naphthalene-based water-reducing agent, water reduction rate ≥15%.

[0077] (II) Preparation method S1 Raw Material Preparation: Weigh each component raw material according to weight parts. The raw materials are taken directly from the warehouse and used without drying treatment. The moisture content is tested to be 1.2%-1.8%. Weighing is done using a regular platform scale with an accuracy of 0.1kg and a weighing error of ≤±0.5%.

[0078] S2 Mixing Process: All raw materials are put into a conventional horizontal mixer at once. There is no premixing step. The mixer is started directly, and the mixing speed is set to 200 rpm for 15 minutes. There is no gravity environment control during the mixing process. The mixing is done solely by the paddle. During the process, the materials clump together several times and need to be broken up manually.

[0079] S3 Feeding and Discharging: There is no fixed order for feeding, all raw materials are added randomly, and the feeding speed is not controlled. Ordinary natural colored sand and powdered raw materials are added at the same time, generating a large amount of dust. After mixing, the material is discharged directly. A small amount of lumps are present in the product, which needs to be sieved before it can be used.

[0080] (III) Instructions for Use S1 Wall Treatment: The surface dust of the wall was simply cleaned, but no leveling was performed. The wall surface had bumps and depressions. The moisture content of the wall was 13% and the pH value was 11.2. No adjustments were made before construction.

[0081] S2 Material Preparation: On an ambient temperature of 25℃, mix the stone paint and tap water at a weight ratio of 100:28 and stir for 5 minutes until no large particles are visible to the naked eye. No settling or curing step is required; it can be used directly for construction.

[0082] S3 construction operation: A regular paint spray gun with a nozzle diameter of 10mm is used. The air compressor pressure is unstable, fluctuating between 0.4-0.9MPa. The spray gun movement speed is uneven during spraying, and the thickness of a single spray varies between 1-4mm. Repeated spraying in some areas causes unevenness. The trowel is tilted at an arbitrary angle during scraping, requiring multiple repairs to achieve the desired finish.

[0083] S4 Maintenance and Topcoat: After construction, the building was not covered with a curing film and was directly exposed to the air, experiencing a short period of light rain within 24 hours; after construction, the topcoat was not sprayed and the building was put into use directly.

[0084] The core functions and mechanical performance indicators of the embodiments and comparative examples are compared in the table below: Table 1 Performance indicators unit Example 1 Example 2 Example 3 Example 4 Example 5 Comparative Example 1 Comparative Example 2 thermal conductivity W / (m·K) 0.028 0.029 0.025 0.027 0.026 0.088 0.092 Bond strength (with concrete substrate) MPa 1.35 1.28 1.42 1.31 1.38 1.25 0.58 Oxygen index (corresponding to fire resistance rating) % 34.2 33.8 34.5 34.0 34.3 33.5 27.6 Hydrophobicity % 98.5 98.2 99.0 98.4 98.8 98.3 85.6 Impact resistance (drop of a 1kg steel ball from 1m) Percentage of areas without cracks 98.2 96.5 99.1 97.3 98.5 95.8 62.4 Crack resistance (50 cycles at -20℃ to 60℃) Maximum crack width (mm) 0.00 0.00 0.00 0.00 0.00 0.00 0.12 Dry density kg / m³ 1650 1630 1680 1640 1660 1670 1720 Compressive strength (28d) MPa 18.6 17.8 19.2 18.1 18.9 17.5 12.3 The following table compares the construction adaptability and long-term durability of the examples and comparative examples: Table 2 Performance indicators unit Example 1 Example 2 Example 3 Example 4 Example 5 Comparative Example 1 Comparative Example 2 Spraying resistance Pa 480 495 470 485 475 780 1250 Coating flatness deviation mm / 2m 1.2 1.3 1.1 1.2 1.1 1.4 2.8 Weather resistance (accelerated aging 1000h) - chalking grade Level (0-4) 0 0 0 0 0 0 3 Weather resistance (accelerated aging 1000h) - color difference ΔE - 0.8 0.9 0.7 0.8 0.7 1.5 3.2 Water resistance (immersion for 72 hours) - strength retention % 96.8 95.5 97.2 96.1 96.5 95.2 78.3 Storage stability (6 months of dry storage) - clumping rate % 0.8 1.2 0.6 1.0 0.7 4.5 32.6 Alkali resistance (immersion in 5% NaOH solution for 48 hours) - strength retention rate % 95.3 94.8 95.6 95.1 95.4 94.5 82.7 Breathability after covering g / (m²·24h) 850 830 880 840 860 820 520 Stain resistance (10% carbon black solution) - stain removal rate % 92.5 91.8 93.2 92.1 92.8 91.5 75.6 As can be clearly seen from the two performance comparison tables above, the aerogel thermal insulation inorganic dry powder stone paint prepared in Examples 1-5 of this invention exhibits significant advantages in all core performance indicators due to the scientific formulation of hydrophobic silica aerogel powder and the optimized preparation process and raw material selection: In terms of core functions, the thermal conductivity is as low as 0.025-0.029 W / (m·K), which is more than 65% lower than that of Comparative Example 1 (0.088 W / (m·K)) without aerogel powder and Comparative Example 2 (0.092 W / (m·K)) with traditional formulation, resulting in outstanding thermal insulation performance. In terms of mechanical properties, the bonding strength reaches 1.28-1.42 MPa, and the 28-day compressive strength is 17.8-19.2 MPa, with excellent crack resistance, far superior to the low bonding strength and obvious cracking problems of Comparative Example 2. In terms of construction adaptability and long-term durability, the spraying resistance is low, the coating smoothness deviation is ≤1.3 mm / 2m, and the clumping rate after 6 months of storage is only 0.6%-1.2%. The weather resistance, water resistance, and alkali resistance are stable, while Comparative Example 2 has many shortcomings such as high spraying resistance, serious clumping during storage, and poor weather resistance.

[0085] Comparative Example 1, lacking the crucial hydrophobic silica aerogel powder, only experienced a significant decrease in thermal insulation performance, while other indicators remained similar to those of the Example, further confirming the core role of aerogel powder in improving thermal insulation performance. In contrast, the traditional formula of Comparative Example 2, due to limitations in raw material quality, preparation process, and construction procedures, lagged behind in all aspects of performance.

[0086] In summary, through formula optimization and process innovation, the product of this invention takes into account excellent thermal insulation effect, reliable mechanical properties, convenient construction and long-term durability, effectively solving the problems of insufficient thermal insulation of traditional stone paint and easy peeling and cracking of traditional insulation materials, and fully meeting the requirements of building energy conservation and strategy.

[0087] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An aerogel thermal insulation inorganic dry powder stone paint, characterized in that, By weight, the components include: 65-75 parts calcined ceramic colored sand, 3-8 parts hydrophobic silica aerogel powder, 10-15 parts heavy calcium carbonate, 2-4 parts rutile titanium dioxide, 8-12 parts silicate cement, 1.5-3 parts redispersible latex powder, 0.2-0.4 parts cellulose ether (HPMC), 0.3-0.5 parts wood fiber, 0.03-0.06 parts starch ether, 0.1-0.3 parts water-repellent agent, and 0.2-0.5 parts water-reducing agent; the real stone paint is in dry powder form, free of lumps and impurities, environmentally friendly and non-toxic, and has Class A fire resistance.

2. The aerogel thermal insulation inorganic dry powder stone paint according to claim 1, characterized in that, The calcined ceramic colored sand is composed of fine sand and medium sand, with a weight ratio of fine sand to medium sand of 1:(1-3). The particle size of the fine sand is 80-120 mesh, and the particle size of the medium sand is 40-80 mesh.

3. The aerogel thermal insulation inorganic dry powder stone paint according to claim 1, characterized in that, The hydrophobic silica aerogel powder has a thermal conductivity ≤0.025 W / (m·K), a hydrophobicity ≥99%, a specific surface area ≥600 m² / g, and a nanoporous structure with a pore size of 20–50 nm.

4. The aerogel thermal insulation inorganic dry powder stone paint according to claim 1, characterized in that, The heavy calcium carbonate has a particle size of 400-800 mesh and a whiteness of ≥93%; the cellulose ether (HPMC) has a viscosity of 40,000-100,000 mPa·s and an ash content of ≤1.0%; the wood fiber has a length of 0.5 mm ± 0.1 mm and an oil absorption rate of ≥5.0 g / g; and the starch ether has a viscosity of 400-1200 mPa·s.

5. The aerogel thermal insulation inorganic dry powder stone paint according to claim 1, characterized in that, The redispersible latex powder is redispersible latex powder 5044N, with a film-forming temperature ≤0℃ and water resistance ≥95%; the water-repellent agent is an organosilicon water-repellent powder with a solid content ≥98%; and the water-reducing agent is a powdered polycarboxylate water-reducing agent.

6. The aerogel thermal insulation inorganic dry powder stone paint according to claim 1, characterized in that, The silicate cement is one or a mixture of two of PO425 grade white cement and PO425 grade gray cement.

7. A method for preparing aerogel thermal insulation inorganic dry powder stone paint as described in claim 1, characterized in that, Includes the following steps: S1: Weigh all the raw materials according to the weight proportions described in claim 1. The raw materials need to be stored in a dry environment for more than 24 hours in advance, and the moisture content should be ≤0.5%. S2: Premix and dilute the trace additives with the large amount of filler. The trace additives include HPMC, starch ether, water repellent and water-reducing agent. The large amount of filler includes heavy calcium carbonate, rutile titanium dioxide and silicate cement. Premix until there are no obvious lumps to ensure that the trace additives are uniformly dispersed in the large amount of filler. S3: Add the premixed materials into the main mixer, and then add them in the following order: redispersible latex powder, wood fiber, calcined ceramic colored sand, and hydrophobic silica aerogel powder. Control the feeding speed to 5-10 kg / min to avoid dust flying. S4: Low-speed, gravity-free mixing and dispersion is adopted, with a mixing speed of 300-600 rpm and a mixing time of 30-45 min. During the mixing process, a gravity-free environment is maintained inside the mixer to avoid material agglomeration, thereby obtaining the inorganic dry powder stone paint.

8. The preparation method of aerogel thermal insulation inorganic dry powder stone paint according to claim 7, characterized in that, In step S2, premixing is carried out using a ribbon mixer at a speed of 150-200 rpm for 10-15 min, with a uniformity deviation of ≤3%.

9. The preparation method of aerogel thermal insulation inorganic dry powder stone paint according to claim 7, characterized in that, In step S3, the interval between the sequential addition of each component is 5 to 10 minutes; a closed feeding device is used when adding the hydrophobic silica aerogel powder to prevent the aerogel powder from flying away and being lost.

10. A method of using the aerogel thermal insulation inorganic dry powder stone paint as described in claim 1, characterized in that, Includes the following steps: S1: Level and clean the building walls, remove impurities, protrusions and dust from the wall surface, and ensure that the wall moisture content is ≤10% and the pH value is ≤10. S2: Mix the real stone paint with water at a weight ratio of 100:(22-25). The mixing ratio can be adjusted according to the ambient temperature. When the ambient temperature is below 10℃, the water ratio is 100:22-23. When the ambient temperature is above 30℃, the water ratio is 100:24-25. Stir with an electric mixer at low speed until a uniform paste without particles is formed. Let it stand and mature for 5-10 minutes, and then stir briefly for 1-2 minutes. S3: Use a special stone paint spray gun or trowel for construction. The nozzle diameter of the spray gun is 4-8mm, and the air pressure of the air compressor is kept stable at 0.6-0.8MPa. When spraying, ensure that the spray gun moves at a uniform speed and the thickness of each spray is 2-3mm. Avoid repeated spraying to prevent mottled appearance. When scraping, the trowel should be tilted at an angle of 30-45° to form a single layer. S4: Avoid rain and direct sunlight for 24 hours after construction. When the ambient temperature is below 5℃, take insulation and curing measures. 72 hours after construction, spray a special inorganic waterproof and breathable topcoat with a coverage rate of 0.1–0.2 kg / m². 2 .

Images