Prefabricated aerogel heat-reflective PET keel wall system and its construction method

Abstract

This invention relates to the field of detachable non-load-bearing wall technology, and discloses a prefabricated aerogel heat-reflective PET keel wall system and its construction method. In this invention, the inventors utilize an aerogel modified layer to solve the problem of difficult adhesion of foamed PET boards, enabling the foamed PET substrate to be installed on the keel via adhesive bonding. The foamed PET substrate itself has thermal insulation capabilities and does not have thermal bridges or convection channels, eliminating the effects of thermal bridging and heat convection; simultaneously, the aerogel modified layer also blocks the effects of heat radiation. The combination of these factors significantly improves the thermal insulation effect. No materials are filled inside the wall, and the aerogel heat-reflective PET composite board is waterproof and impermeable, so leaks inside the wall will not damage the wall and the leak location is easy to find. The aerogel heat-reflective PET composite board has high strength and low weight, allowing heavy objects to be hung directly. Furthermore, the aerogel modified layer has a rough surface and good chemical compatibility, allowing for direct adhesion of various finishing layers.

Description

Technical Field

[0001] This invention relates to the field of detachable non-load-bearing wall technology, and in particular to a prefabricated aerogel heat-reflective PET keel wall system and its construction method. Background Technology

[0002] A keel wall is a type of non-load-bearing wall that can be constructed quickly. Its typical structure consists of a keel frame on both sides, with wall panels suspended by bolts, and the middle filled with insulation or sound-absorbing material. Building pipelines are also housed within the keel frame. The wall panels are usually made of gypsum board, with paint or wallpaper applied as a finishing layer. If heavier materials such as stone or ceramic tiles need to be hung on the wall panels, the gypsum board must be replaced with stronger wall panels such as cement board or calcium silicate board.

[0003] This structure presents three insurmountable difficulties:

[0004] Firstly, the insulation effect is very poor because the insulation filler is placed in the gaps of the keel frame, making the keel frame and building pipelines thermal bridges, which severely weakens the insulation effect. Moreover, the existing insulation materials in the keel wall, such as glass wool, do not take into account the effects of heat convection and heat radiation, and only weaken the heat conduction. However, there is still a significant amount of heat convection and heat radiation in the non-dense structure of the keel wall.

[0005] Secondly, the impact of water leakage is extremely serious and difficult to detect and repair. The insulation filler in existing keel walls is mainly open-pore materials like glass wool, which allows water to seep into. If pipes buried in the wall leak, the insulation filler will completely lose its insulating ability. Simultaneously, the leaking water will damage the surface decorative layer, causing tiles and stone to become hollow, peel, and effloresce; paint / wallpaper to blister, mold, and efflorescence. The leaking water will also continue to spread along the insulation filler, dissolving a large amount of impurities during the diffusion process. If it reaches electrical wiring connections, it can cause short circuits. Because the leaking water is inside the insulation material, it is difficult to see, and therefore, the leak is only noticed after the wall has been severely damaged, making it difficult to pinpoint the location of the leak.

[0006] Finally, this type of wall surface lacks structural load-bearing capacity. If heavy objects need to be hung on the surface, the wall needs to be reinforced in advance. However, it is difficult to predict exactly where heavy objects will be hung during wall construction. Therefore, if reinforcement is required, the wall panels must be broken up before reinforcement can be carried out.

[0007] Foamed PET boards are building panels made of foamed polyester plastic. Their raw materials are widely available, including discarded mineral water bottles, thus achieving waste utilization. Unlike other building insulation materials, foamed PET boards have good mechanical strength, making them suitable for use as load-bearing components. Furthermore, the closed-cell pores in foamed PET boards, combined with their high mechanical strength, make them very difficult to crush.

[0008] However, foamed PET boards have a major drawback that is very difficult to overcome: they are difficult to bond with other building materials.

[0009] Organic adhesive bonding: Due to the chemical properties of the foamed PET board itself, the adhesive film formed by water-based organic adhesives cannot effectively bond with the foamed PET board and will separate from each other shortly after curing; while oil-based organic adhesives will corrode the foamed PET board.

[0010] Cement mortar bonding: The bond between the foamed PET board and the cement mortar is very weak, with an adhesion of less than 0.1 MPa.

[0011] Inorganic adhesive bonding: Inorganic adhesives have better adhesion than cement mortar, but the bonding is very easy to fail. After other building components are bonded to foamed PET boards with inorganic adhesives, they will fall off due to thermal expansion and contraction or repeated pulling.

[0012] Mechanical connections: Bolts and other mechanical connectors are difficult to seal through holes in foamed PET boards (where gaps exist around the holes), because conventional building materials used for sealing holes are essentially adhesives or cement mortar. If foamed PET boards are used on building exteriors, these mechanical connections can lead to leaks. Furthermore, these mechanical connectors themselves can act as thermal bridges.

[0013] Aerogel is a novel type of thermal insulation material with significantly better insulation performance than other types of insulation materials. Aerogel has open pores with a pore size of 20-50 nanometers. Commercially available aerogel products mainly exist in the form of aerogel powder and aerogel felt. Summary of the Invention

[0014] This invention provides a prefabricated aerogel heat-reflective PET keel wall system and its construction method.

[0015] The technical problem to be solved is that the existing keel wall has poor thermal insulation, water leakage has serious and difficult-to-detect and repair effects, and the wall surface has no structural load-bearing capacity.

[0016] To solve the above technical problems, the present invention adopts the following technical solution: a prefabricated aerogel heat-reflective PET keel wall system, including a keel layer, an aerogel heat-reflective PET composite board that is pasted on the keel layer by adhesive applied on site, and a decorative layer disposed on the outer surface of the aerogel heat-reflective PET composite board.

[0017] The aerogel heat-reflective PET composite board includes a foamed PET substrate and an aerogel modified layer coated on both sides of the foamed PET substrate. An anti-crack mesh is embedded in the aerogel modified layer to prevent the extension of cracks in the aerogel modified layer. The foamed PET substrate, the aerogel modified layer, and the anti-crack mesh are combined into a prefabricated part. The aerogel modified layer is an inorganic adhesive doped with aerogel powder, which is applied to the aerogel heat-reflective PET composite board during the prefabrication stage and presents itself as a bendable foamed material.

[0018] Building pipelines are installed in the gaps of the keel layer, and the pipelines are surrounded by free space without filling material. The aerogel heat-reflective PET composite board is a complete board without through holes and thermal bridges before and after installation.

[0019] Furthermore, the finishing layer can be a coating applied to an aerogel heat-reflective PET composite board, a tile adhered to the aerogel heat-reflective PET composite board with cement mortar, or wallpaper adhered to the aerogel heat-reflective PET composite board with adhesive.

[0020] Furthermore, the inorganic adhesive in the aerogel modified layer is a silicate adhesive, and the aerogel powder is silica aerogel powder; the adhesive between the keel layer and the aerogel heat-reflective PET composite board is referred to as the on-site adhesive, which is a modified silane polyether adhesive.

[0021] Furthermore, the keel layer contains only vertical keels, which are installed in close contact with the aerogel heat-reflective PET composite board. In the building pipelines, water pipes and electrical wires are separated by at least one vertical keel.

[0022] Furthermore, the aerogel heat-reflective PET composite board is pasted on one or both sides of the keel layer. If the aerogel heat-reflective PET composite board is pasted on both sides of the keel layer, a drainage groove is provided on the base surface below the keel layer for observing whether there is water leakage inside the wall and draining the leaked water. The drainage groove is parallel to the extension direction of the wall system and is located below the entire keel layer. The outlet of the drainage groove is located outside the wall.

[0023] Furthermore, the wall system also includes a fiber optic camera for locating leaks, which probes into the wall through a drilled hole after detecting water in the drainage channel.

[0024] Furthermore, the infrared reflectance of the aerogel modified layer is not less than 0.85, the closed-cell rate of the foamed PET substrate is not less than 85%, and the crack-resistant mesh is basalt mesh or carbon fiber mesh.

[0025] A construction method for a prefabricated aerogel heat-reflective PET keel wall system, used for constructing the aforementioned prefabricated aerogel heat-reflective PET keel wall system, includes the following steps:

[0026] Step 1: Preparation of aerogel heat-reflective PET composite plate;

[0027] Step 2: Install the keel layer and install building pipelines within the keel layer;

[0028] Step 3: Attach the aerogel heat-reflective PET composite board to the keel layer;

[0029] Step 4: Apply the finishing layer to the aerogel heat-reflective PET composite board.

[0030] Furthermore, step one includes the following sub-steps:

[0031] Step 1.1: Stir and mix the aerogel powder and inorganic adhesive. The aerogel powder and inorganic adhesive are mixed under constant temperature or cooling conditions, and ultrasonic treatment is not allowed during the mixing process to ensure that the air in the aerogel powder is not replaced by the inorganic adhesive.

[0032] Step 1.2: Apply the inorganic adhesive containing aerogel powder to the surface of the flat foamed PET substrate to form an aerogel modified layer. Then, spread the anti-crack mesh on the aerogel modified layer and smooth it out so that the anti-crack mesh is embedded in the aerogel modified layer.

[0033] Step 1.3: After the aerogel modified layer solidifies, flip the foamed PET substrate and repeat step 1.2 to complete the coating on both sides of the foamed PET substrate.

[0034] Compared with existing technologies, the prefabricated aerogel heat-reflective PET keel wall system and its construction method of the present invention have the following advantages:

[0035] In this invention, by adding aerogel powder to an inorganic adhesive to make it a foaming material, the ductility of the adhesive film is greatly improved, making it less prone to breakage under shear force, and the amount of thermal deformation is consistent with that of the foamed PET substrate, avoiding cracking and detachment due to large differences in thermal deformation. This allows the aerogel modified layer to be firmly bonded to the foamed PET substrate. Other adhesives or cement mortar used in subsequent construction can then be applied to the aerogel modified layer and connected to the foamed PET substrate, thus solving the problem of the difficulty in bonding the foamed PET substrate and enabling the application of the foamed PET substrate in keel walls. The foamed PET substrate itself possesses thermal insulation capabilities and structural strength, and is installed via adhesive bonding. The entire board is free of thermal bridges (no need for separation by a keel, nor for bolt installation) or convection channels (no need for drilling, eliminating macroscopic convection channels; furthermore, the foamed PET substrate is a closed-cell material, eliminating microscopic convection channels), thus eliminating the effects of thermal bridges and heat convection. Simultaneously, the inorganic adhesive mixed with aerogel powder exhibits infrared reflectivity (reaching over 0.85), and the two aerogel-modified layers block the effects of heat radiation. The combination of these factors results in a significantly improved thermal insulation performance of the keel wall in this invention compared to existing technologies.

[0036] In this invention, the interior of the wall is not filled with any material, and the aerogel heat-reflective PET composite board is waterproof (will not be damaged by soaking) and impermeable. If water leaks inside the wall, the leaked water can only flow down and drain away, without causing damage to the wall. Moreover, because the interior of the wall is open, it is easy to find the location of the leak.

[0037] In this invention, the aerogel heat-reflective PET composite board exhibits high strength and low weight. The aerogel modified layer and crack-resistant mesh further enhance its strength, and its surface possesses structural load-bearing capacity, allowing for direct hanging of heavy objects. Simultaneously, the rough surface of the aerogel modified layer eliminates the need for scraping / scraping, and its good chemical compatibility allows for direct and reliable bonding with various materials, including cement mortar, organic adhesives, and inorganic adhesives. Therefore, the finishing layer can be directly applied via adhesive without any reinforcement measures or surface treatment, making construction convenient, quick, and applicable to a wide range of situations. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the prefabricated aerogel heat-reflective PET keel wall system of the present invention;

[0039] Figure 2 This is a schematic diagram of the structure of an aerogel heat-reflective PET composite panel.

[0040] Figure 3 This is a schematic diagram of step two in the construction method of the prefabricated aerogel heat-reflective PET keel wall system of the present invention.

[0041] Figure 4 This is a schematic diagram of step three in the construction method of the prefabricated aerogel heat-reflective PET keel wall system of the present invention.

[0042] Figure 5 This is a schematic diagram of step four in the construction method of the prefabricated aerogel heat-reflective PET keel wall system of the present invention.

[0043] In the diagram, 1-keel layer, 2-on-site adhesive, 3-aerogel heat-reflective PET composite board, 31-foamed PET substrate, 32-aerogel modified layer, 33-crack-resistant mesh, and 4-finishing layer. Detailed Implementation

[0044] like Figure 1 As shown, the prefabricated aerogel heat-reflective PET keel wall system includes a keel layer 1, an aerogel heat-reflective PET composite panel 3 that is pasted onto the keel layer 1 by adhesive applied on site, and a finishing layer 4 disposed on the outer surface of the aerogel heat-reflective PET composite panel 3.

[0045] like Figure 2 As shown, the aerogel heat-reflective PET composite board 3 includes a foamed PET substrate 31 and an aerogel modified layer 32 coated on both sides of the foamed PET substrate 31. An anti-crack mesh 33 is embedded in the aerogel modified layer 32 to prevent the extension of cracks in the aerogel modified layer 32. The foamed PET substrate 31, the aerogel modified layer 32, and the anti-crack mesh 33 are combined into a whole preform. The aerogel modified layer 32 is an inorganic adhesive doped with aerogel powder. It is applied to the aerogel heat-reflective PET composite board 3 during the prefabrication stage and is in the form of a bendable foamed material.

[0046] The inventors discovered that the reason why the connection of other building components to the foamed PET substrate 31 using inorganic adhesives is prone to failure is that the inorganic adhesives (whether silicate or phosphate adhesives) have poor ductility after curing. They are easily broken under shear forces perpendicular to the adhesive film direction. The foamed PET substrate 31 is less rigid than steel or concrete, and when the building components bonded to it by the inorganic adhesive are pulled, it cannot effectively resist deformation, causing the adhesive film to break under shear forces. At the same time, the difference in thermal deformation between the inorganic adhesive and the foamed PET substrate 31 (which is the foaming material) is huge. During thermal expansion and contraction, the adhesive film of the inorganic adhesive will be subjected to enormous temperature stress and crack and detach. However, when the aerogel modified layer 32 is a foaming material, its thermal deformation is consistent with that of the foamed PET substrate 31, and its ductility is significantly improved. In practical applications, the composite insulation board of this invention will not have the aerogel modified layer 32 fall off even after being repeatedly trampled by construction workers, and it can be firmly attached to tiles, junction boxes, cement mortar, various paints, wallpaper, or decorative panels.

[0047] It is very difficult to make inorganic adhesives into foam materials that can be directly bonded to the foamed PET substrate 31. Existing inorganic adhesives, whether silicate-based or phosphate-based, cannot maintain stable air bubbles after being spread into a thin layer, and they will escape before curing.

[0048] However, if, as in this invention, powder containing air bubbles is incorporated into an inorganic adhesive to form a foamed material (because the adhesive film can only hold powder), it also presents numerous difficulties. In practice, it was found that closed-cell powder incorporated into an inorganic adhesive floats to the surface. While the floating phenomenon is improved with open-cell powder, the internal air bubbles are displaced by the inorganic adhesive during mixing, resulting in poor performance. After numerous attempts, the inventors discovered that because the pores in the aerogel powder are extremely small, by carefully controlling the stirring conditions, it is possible to ensure that the internal air bubbles are not displaced by the inorganic adhesive during mixing.

[0049] Building pipelines are installed in the gaps of the keel layer 1. The pipelines are surrounded by free space without filling material. This free space ensures that if water leaks inside the wall, it will not be absorbed. At the same time, the aerogel heat-reflective PET composite board 3 is waterproof and impermeable, so the leaked water can only flow downwards and will not cause damage.

[0050] The aerogel heat-reflective PET composite panel 3 is a complete sheet material without through holes or thermal bridges, both before and after installation. Thermal bridges are caused by high thermal conductivity components (such as bolts) that penetrate the aerogel heat-reflective PET composite panel 3. Because all connections in this invention are made using adhesive bonding, and the insulation layer (i.e., the aerogel heat-reflective PET composite panel 3) is located outside the keel layer 1, it is possible to achieve the absence of through holes and thermal bridges, ensuring that insulation is not affected by thermal bridges or heat convection.

[0051] The finishing layer 4 is a coating applied to the aerogel heat-reflective PET composite board 3, a tile pasted on the aerogel heat-reflective PET composite board 3 with cement mortar, or wallpaper pasted on the aerogel heat-reflective PET composite board 3 with adhesive.

[0052] The aerogel-modified layer 32 has a surface texture similar to frosted glass; it is a smooth yet quite rough surface that can bond firmly to cement mortar without the need for chiseling or scraping. Furthermore, due to its composition and surface structure, its surface has excellent chemical compatibility and can be effectively wetted by various existing adhesives and cement mortars. Therefore, various finishing layers 4 can be installed using adhesives.

[0053] The inorganic adhesive in the aerogel modified layer 32 is a silicate adhesive, and the aerogel powder is silica aerogel powder; in this combination, the interaction force between the two is large, which can effectively resist floating during the mixing process.

[0054] The adhesive between the keel layer 1 and the aerogel heat-reflective PET composite board 3 is designated as on-site adhesive 2, which is a modified silane polyether adhesive. Modified silane polyether adhesive, also known as MS adhesive, exhibits strong adhesion and performs well with silicate adhesives and silica aerogel powder during wetting and curing (due to similar polarities and numerous similar functional groups). Silicate adhesives are not suitable for on-site use as on-site adhesive 2; although they offer better wetting, their curing requirements are high, making them unsuitable for field application.

[0055] In keel layer 1, there are only vertical keels, which are set tightly against the aerogel heat-reflective PET composite board 3. This allows leaked water to flow smoothly and also makes it easy to check the location of the leak. In building pipelines, water pipes and electrical wires are separated by at least one vertical keel. Since the vertical keel and the aerogel heat-reflective PET composite board 3 are glued together, the two are tightly bonded, and the vertical keel can effectively separate different pipelines.

[0056] Aerogel heat-reflective PET composite board 3 is pasted on one or both sides of the keel layer 1. If the aerogel heat-reflective PET composite board 3 is pasted on both sides of the keel layer 1, a drainage channel is opened on the base surface below the keel layer 1 for observing whether there is water leakage in the wall and draining the leaked water. The drainage channel is parallel to the extension direction of the wall system and is located below the entire keel layer 1. The outlet of the drainage channel is located outside the wall.

[0057] This way, if a leak occurs, the leaking water can be drained quickly and detected promptly.

[0058] The wall system also includes fiber optic cameras for locating leaks. Once water is detected in the drainage channel, the fiber optic cameras probe into the wall through a drilled hole.

[0059] Here, holes can be drilled along the wall's extension direction at the bottom, one hole between every two vertical studs to check until the leak is found. After repair, the holes can be sealed with an inorganic adhesive mixed with aerogel powder.

[0060] The infrared reflectance of the aerogel-modified layer 32 is not less than 0.85. Different inorganic adhesives exhibit different changes in infrared reflectance after the addition of aerogel powder; therefore, the amount of aerogel powder added needs to be adjusted according to the actual situation to change the infrared reflectance. Generally, the more aerogel powder added, the higher the infrared reflectance.

[0061] In this embodiment, the closed-cell ratio of the foamed PET substrate 31 is not less than 85%. If the foamed PET substrate 31 is to be used as a building exterior wall panel, it needs to have sufficient waterproof effect. Therefore, there is a requirement for the closed-cell ratio to ensure that the waterproof effect is sufficient.

[0062] The crack-resistant mesh 33 is made of basalt mesh or carbon fiber mesh, which can be firmly bonded to the inorganic adhesive used here.

[0063] A construction method for a prefabricated aerogel heat-reflective PET keel wall system, used for constructing the aforementioned prefabricated aerogel heat-reflective PET keel wall system, includes the following steps:

[0064] Step 1: Prepare aerogel heat-reflective PET composite plate 3;

[0065] like Figure 3 As shown, step two: install keel layer 1 and install building pipelines in keel layer 1;

[0066] like Figure 4 As shown, step three: attach the aerogel heat-reflective PET composite plate 3 onto the keel layer 1;

[0067] The seams between the aerogel heat-reflective PET composite panels 3 must also be filled tightly to prevent heat convection. In this embodiment, because the aerogel heat-reflective PET composite panels 3 are very light and have high strength, they can be used on every wall. Figure 4 That way, only one board is used to ensure that the seams are minimized and the construction efficiency is high; the seams can be filled with adhesive strips or inorganic adhesives mixed with aerogel powder;

[0068] like Figure 5 As shown, step four: apply the finishing layer 4 onto the aerogel heat-reflective PET composite board 3.

[0069] Step one includes the following sub-steps:

[0070] Step 1.1: Stir and mix the aerogel powder and inorganic adhesive. The aerogel powder and inorganic adhesive are mixed under constant temperature or cooling conditions, and ultrasonic treatment is not allowed during the mixing process to ensure that the air in the aerogel powder is not replaced by the inorganic adhesive.

[0071] Step 1.2: Apply an inorganic adhesive containing aerogel powder to the surface of the flat foamed PET substrate 31 to form an aerogel modified layer 32. Then, spread an anti-crack mesh 33 on the aerogel modified layer 32 and smooth it out so that the anti-crack mesh 33 is embedded in the aerogel modified layer 32.

[0072] Step 1.3: After the aerogel modified layer 32 solidifies, flip the foamed PET substrate 31 and repeat step 1.2 to complete the coating on both sides of the foamed PET substrate 31.

[0073] The previous section ensured that the aerogel powder would not float by using a formulation of inorganic adhesive and aerogel powder. Here, however, conditions during the stirring process are controlled to prevent air bubbles from being displaced from the aerogel powder. Unlike the pores in catalyst particles, the pores in aerogel powder contain air, which is immiscible with the inorganic adhesive. Furthermore, because the pores are small enough, as long as the air inside doesn't escape, it can prevent the inorganic adhesive from entering. Therefore, the temperature during stirring is controlled to prevent the air from expanding and escaping from the aerogel powder due to increased temperature. Ultrasonic vibration must also be avoided. While ultrasonic stirring is a highly efficient method, its application here would expel air from the aerogel powder.

[0074] In this embodiment, the aerogel heat-reflective PET composite board 3 has been prepared as a sample and sent for testing. The testing units are: Beijing CITIC Testing Holding Group Co., Ltd. and the National Building Materials Industry Building Materials and Structure Safety Quality Supervision and Inspection Center.

[0075] Test results show that the adhesion between the foamed PET substrate 31 and the aerogel modified layer 32 exceeds 0.6 MPa, while 0.35 MPa is sufficient to meet the requirements for tiling.

[0076] Meanwhile, the aerogel heat-reflective PET composite board 3 (12mm thick) in this embodiment has a surface density of 2.5 kg / m², while the surface density of paper-faced gypsum board of the same thickness is 8.7 kg / m², and the surface density of fiberglass high-strength gypsum board of the same thickness is 10 kg / m². The surface density of the PET composite board is 1 / 3 to 1 / 4 of the above two types of gypsum board, but its structural strength, thermal insulation effect and other properties are higher.

[0077] In addition, the thermal conductivity of the aerogel heat-reflective PET composite board 3 is lower than that of the foamed PET substrate 31 of the same thickness, resulting in better heat preservation.

[0078] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A prefabricated aerogel heat-reflective PET keel wall system, characterized in that: It includes a keel layer (1), an aerogel heat-reflective PET composite board (3) that is pasted onto the keel layer (1) by adhesive applied on site, and a decorative layer (4) set on the outer surface of the aerogel heat-reflective PET composite board (3). The aerogel heat-reflective PET composite board (3) includes a foamed PET substrate (31) and an aerogel modified layer (32) coated on both sides of the foamed PET substrate (31). An anti-crack mesh (33) is embedded in the aerogel modified layer (32) to prevent the extension of cracks in the aerogel modified layer (32). The foamed PET substrate (31), the aerogel modified layer (32), and the anti-crack mesh (33) are combined into a whole preform. The aerogel modified layer (32) is an inorganic adhesive doped with aerogel powder. It is applied to the aerogel heat-reflective PET composite board (3) during the prefabrication stage and is in the form of a bendable foamed material. The thermal deformation of the aerogel modified layer (32) is consistent with that of the foamed PET substrate (31). The aerogel powder and the inorganic adhesive are mixed under constant temperature or cooling conditions, and ultrasonic treatment is not allowed during the mixing process to ensure that the air in the aerogel powder is not replaced by the inorganic adhesive. Building pipelines are installed in the gaps of the keel layer (1), and the area around the pipelines is a free space without filling material. The aerogel heat-reflective PET composite board (3) is a complete board without through holes and thermal bridges before and after installation.

2. The prefabricated aerogel heat-reflective PET keel wall system according to claim 1, characterized in that: The finishing layer (4) is a coating applied to the aerogel heat-reflective PET composite board (3), a tile pasted on the aerogel heat-reflective PET composite board (3) by cement mortar, or wallpaper pasted on the aerogel heat-reflective PET composite board (3) by adhesive.

3. The prefabricated aerogel heat-reflective PET keel wall system according to claim 2, characterized in that: The inorganic adhesive in the aerogel modified layer (32) is a silicate adhesive, and the aerogel powder is silica aerogel powder; the adhesive between the keel layer (1) and the aerogel heat reflective PET composite board (3) is called the on-site adhesive (2), and the on-site adhesive (2) is a modified silane polyether adhesive.

4. The prefabricated aerogel heat-reflective PET keel wall system according to claim 1, characterized in that: The keel layer (1) contains only vertical keels, which are set in close contact with the aerogel heat-reflective PET composite board (3). In the building pipeline, water pipes and electrical wires are separated by at least one vertical keel.

5. The prefabricated aerogel heat-reflective PET keel wall system according to claim 4, characterized in that: The aerogel heat-reflective PET composite board (3) is pasted on one or both sides of the keel layer (1). If the aerogel heat-reflective PET composite board (3) is pasted on both sides of the keel layer (1), a drainage groove is provided on the base surface below the keel layer (1) for observing whether there is water leakage in the wall and draining the leaked water. The drainage groove is parallel to the extension direction of the wall system and is located below the entire keel layer (1). The outlet of the drainage groove is located outside the wall.

6. The prefabricated aerogel heat-reflective PET keel wall system according to claim 5, characterized in that: The wall system also includes a fiber optic camera for locating leaks, which probes into the wall through a drilled hole after detecting water in the drainage channel.

7. The prefabricated aerogel heat-reflective PET keel wall system according to claim 1, characterized in that: The infrared reflectance of the aerogel modified layer (32) is not less than 0.85, the closed-cell rate of the foamed PET substrate (31) is not less than 85%, and the crack-resistant mesh (33) is basalt mesh or carbon fiber mesh.

8. A construction method for a prefabricated aerogel heat-reflective PET keel wall system, characterized in that: For constructing the prefabricated aerogel heat-reflective PET keel wall system as described in claim 1, and comprising the following steps: Step 1: Preparation of aerogel heat-reflective PET composite plate (3); Step 2: Install the keel layer (1) and install building pipelines in the keel layer (1); Step 3: Attach the aerogel heat-reflective PET composite board (3) to the keel layer (1); Step 4: Apply the finishing layer (4) to the aerogel heat-reflective PET composite board (3).

9. The construction method of the prefabricated aerogel heat-reflective PET keel wall system according to claim 8, characterized in that: Step one includes the following sub-steps: Step 1.1: Stir and mix the aerogel powder and inorganic adhesive thoroughly; Step 1.2: Apply an inorganic adhesive containing aerogel powder to the surface of a flat foamed PET substrate (31) to form an aerogel modified layer (32). Then spread an anti-crack mesh (33) on the aerogel modified layer (32) and smooth it out so that the anti-crack mesh (33) is embedded in the aerogel modified layer (32). Step 1.3: After the aerogel modified layer (32) solidifies, flip the foamed PET substrate (31) and repeat step 1.2 to complete the coating on both sides of the foamed PET substrate (31).

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