A soft material with heat insulation, refrigeration and decoration functions for external wall

Abstract

This invention discloses an integrated flexible material for exterior wall insulation, heat insulation, cooling, and decoration, relating to the field of exterior wall insulation. It comprises, from the outside in, a flexible decorative protective surface layer, a radiative cooling functional layer, a flexible thermal insulation core layer, and a waterproof and breathable adhesive bottom layer, all sequentially composited. Adjacent functional layers are bonded together by a flexible adhesive system to form a single flexible roll structure. Through the combination of rare-earth lanthanum-doped barium titanate nanoparticles and two-dimensional black phosphorus nanosheets in the radiative cooling functional layer, and utilizing their high emissivity in the atmospheric window band and high reflectivity in the solar radiation band, energy-free passive radiative cooling is achieved.

Description

Technical Field

[0001] This invention relates to the field of exterior wall insulation, specifically to an integrated flexible material for exterior wall insulation, heat insulation, cooling, and decoration. Background Technology

[0002] Currently, most traditional exterior wall insulation, cooling, and decorative materials on the market are modular structures, with limited functionality and cumbersome construction procedures. They typically only offer basic insulation or decorative effects, rarely combining passive cooling, waterproofing, breathability, and integrated protection. Conventional rigid insulation boards suffer from poor flexibility and adaptability, unable to fit curved exterior walls or slightly deformed substrates. Long-term use easily leads to cracking, hollowing, and detachment, and their weather resistance fails to meet the demands of long-term outdoor service. Furthermore, modular materials require layered construction and multiple molding processes, resulting in long construction cycles, high labor costs, poor compatibility between functional layers, and insufficient interfacial bonding stability, making them prone to interlayer delamination failure, severely impacting the overall energy efficiency and protective effect of the exterior wall.

[0003] Current energy-saving exterior wall materials generally suffer from core problems such as the inability to coordinate thermal insulation and radiative cooling performance, and low structural integration. Most materials rely solely on single thermal insulation barriers for temperature control, failing to utilize infrared radiation for passive heat dissipation and cooling. This results in severe heat accumulation and poor cooling effects in summer, making them unsuitable for complex climatic conditions such as high temperatures and extreme cold. Furthermore, traditional flexible exterior wall materials have simple functional layer structures, lacking dedicated cooling filler systems and porous thermal insulation composite structures. They cannot simultaneously achieve thermal insulation, cooling, waterproofing, and decorative performance, resulting in poor mass production adaptability and engineering practicality. Consequently, they cannot meet the construction and usage requirements of modern building exterior walls for integration, lightweighting, and long-term energy efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide an integrated flexible material for exterior wall insulation, heat insulation, cooling and decoration, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A flexible material integrating thermal insulation, heat insulation, cooling and decoration for exterior walls includes a flexible decorative protective surface layer, a radiant cooling functional layer, a flexible thermal insulation core layer and a waterproof and breathable adhesive bottom layer, which are sequentially composited from the outside to the inside. The adjacent functional layers are composited into a flexible roll structure through a flexible adhesive system. The radiation cooling functional layer contains rare earth lanthanum-doped barium titanate nanoparticles and two-dimensional black phosphorus nanosheets as cooling functional fillers. The flexible thermal insulation core layer is a porous flexible fiber composite felt substrate, and the core layer is filled with organic aerogel particles.

[0006] As a further aspect of the present invention: the flexible decorative protective surface layer is a flexible inorganic mineral coating or a fluorocarbon modified acrylic coating with a thickness of 0.1-0.5 mm, and the surface layer contains UV-resistant additives and / or hydrophobic additives.

[0007] As a further embodiment of the present invention: the radiation cooling functional layer is a polymer composite coating with a thickness of 0.2-0.8 mm, and the raw materials include modified acrylic resin, hollow glass microspheres, silica nanoparticles, far-infrared ceramic powder and dispersing agent; the ratio of rare earth lanthanum doped barium titanate nanoparticles to two-dimensional black phosphorus nanosheets is (5-20):1.

[0008] As a further embodiment of the present invention: the flexible thermal insulation core layer is a flexible substrate composed of diatomaceous earth porous flexible fiber composite felt and flexible polyurethane foam material, with a thickness of 3-15mm and a bulk density of 80-150kg / m³. 3 The thermal conductivity is ≤0.030W / (m·K); the organic aerogel particles are carbonized organic aerogel particles, which are dispersed inside the core layer to form a porous thermal insulation network structure.

[0009] As a further embodiment of the present invention: the waterproof and breathable adhesive underlayer is a modified polyurethane flexible adhesive layer with a thickness of 0.3-0.6mm. The underlayer is provided with micron-level breathable pores, with an air permeability of ≥300g / (㎡·24h) and a water pressure resistance of ≥0.3MPa.

[0010] As a further aspect of the present invention: an interpenetrating interface bonding layer is provided between two adjacent functional layers. The interpenetrating interface bonding layer is formed by the mutual penetration and in-situ curing of the materials of the adjacent layers before they are fully cured. The interfacial peel strength between each adjacent layer is ≥1.2N / mm.

[0011] A method for preparing an integrated flexible material for exterior wall insulation, heat insulation, cooling, and decoration, comprising the following steps: S1. Surface activation treatment is performed on the upper and lower surfaces of the flexible thermal insulation core layer to improve interfacial adhesion; S2. Prepare radiative cooling functional layer slurry, flexible decorative protective surface layer slurry and waterproof and breathable adhesive bottom layer slurry respectively, and disperse rare earth lanthanum doped barium titanate nanoparticles and two-dimensional black phosphorus nanosheets in the radiative cooling functional layer slurry; premix organic aerogel particles into the flexible thermal insulation core layer. S3. The radiative cooling functional layer slurry and the flexible decorative protective surface layer slurry are sequentially applied to the upper surface of the flexible thermal insulation core layer after surface activation treatment, and the waterproof and breathable adhesive underlayer slurry is applied to the lower surface of the core layer. S4. The coated composite substrate is fed into a curing equipment for curing treatment, so that the interfaces of each layer form a bonded structure, and an integrated flexible roll material is obtained. S5. After curing, the material is cooled, rolled up, and trimmed to obtain the finished soft material.

[0012] As a further aspect of the present invention: in step S1, the surface activation treatment adopts plasma treatment, with a treatment power of 80-120W, a treatment distance of 5-10mm, a treatment speed of 2-4m / min, and the surface wetting tension of the core layer after treatment is ≥42mN / m.

[0013] As a further aspect of the present invention: In step S3, each functional layer is formed by a doctor blade coating combined with a pressure roller pressing method, the coating speed is 1.5-3m / min, and after coating, pre-curing is performed, the pre-curing temperature is 40-60℃, and the pre-curing time is 8-15min.

[0014] As a further aspect of the present invention: in step S4, the curing process adopts a segmented heating curing process, including: the first segment is kept at 50-60℃ for 20-30 minutes, the second segment is kept at 70-80℃ for 15-25 minutes, and the third segment is kept at 90-100℃ for 10-15 minutes.

[0015] Compared with the prior art, the beneficial effects of the present invention are: ① By combining rare-earth lanthanum-doped barium titanate nanoparticles with two-dimensional black phosphorus nanosheets in the radiative cooling functional layer, and utilizing the high emissivity of both in the atmospheric window band and their high reflectivity in the solar radiation band, energy-free passive radiative cooling is achieved. Simultaneously, the flexible thermal insulation core layer uses a porous fiber composite felt with low thermal conductivity and is filled with organic aerogel particles, effectively blocking external heat conduction to the inner side of the wall. The synergistic effect of radiative cooling and high-efficiency thermal insulation can significantly reduce the exterior surface temperature of the exterior wall and the indoor cooling load in summer, thereby reducing building operating energy consumption.

[0016] ② The four functional layers—decorative, radiant cooling, thermal insulation, and waterproof / breathable bonding—are combined into an integrated roll material using a flexible bonding system. During the curing process, interpenetrating interfaces are formed between the layers, resulting in a peel strength ≥1.2 N / mm. This effectively avoids the risk of detachment caused by delamination and hollow areas in traditional multi-layer external insulation systems. The roll material is highly flexible, adaptable to slight deformations of building exterior walls and irregularly shaped areas, allowing for the completion of multiple processes—decorative, thermal insulation, cooling, and waterproofing—in a single application. This results in high construction efficiency and low overall cost.

[0017] ③ A waterproof and breathable bonding underlayer is installed on the lower surface of the core layer. Through a micron-level pore design, it achieves unidirectional moisture removal (breathability ≥300g / (㎡·24h)), preventing moisture accumulation inside the wall that could lead to mold growth or insulation layer failure. It also withstands water pressure ≥0.3MPa, effectively resisting external rainwater penetration. Furthermore, the diatomaceous earth-based porous core layer possesses a certain moisture regulation capacity, buffering changes in the microenvironment humidity at the wall interface and improving the long-term stability and service life of the overall system under complex climatic conditions such as hot summers, cold winters, and high humidity. Attached Figure Description

[0018] Figure 1 This is a structural schematic diagram of an integrated flexible material for exterior wall insulation, heat insulation, cooling, and decoration. Detailed Implementation

[0019] The present invention will be further described below with reference to specific embodiments. The following embodiments are only used to explain the present invention and do not constitute a limitation on the scope of protection of the present invention.

[0020] This is an integrated flexible material for exterior wall insulation, heat insulation, cooling, and decoration. The entire structure is a flexible roll, suitable for flat and slightly curved exterior wall substrates. Construction is convenient and requires no complex tooling. The product is layered from the outside in, consisting of a flexible decorative protective surface layer, a radiant cooling functional layer, a flexible thermal insulation core layer, and a waterproof and breathable adhesive bottom layer. Adjacent functional layers are tightly bonded together by a flexible adhesive system, and interpenetrating interface layers are provided between the layers. The overall integration is high, preventing delamination and detachment, making it suitable for various civil and industrial exterior wall insulation and decoration projects.

[0021] Flexible decorative protective surface layer: This is the outermost layer of the product, mainly serving the functions of weather protection, exterior wall decoration, and resistance to ultraviolet aging. It can be made of either a flexible inorganic mineral coating or a fluorocarbon modified acrylic coating, depending on project requirements. The surface layer thickness is controlled between 0.1-0.5mm. During the production process, one or both of the following additives are added as needed: UV-resistant additives and hydrophobic additives. This effectively resists outdoor rain erosion and sun aging, extending the service life of the product's exterior wall and adapting to long-term, complex outdoor working conditions.

[0022] Radiant cooling functional layer: Located inside the decorative and protective surface layer, this is the core functional layer for achieving passive cooling of the wall and reducing the surface temperature of the exterior wall. It adopts a polymer composite coating structure with a thickness ranging from 0.2 to 0.8 mm. The raw materials are modified acrylic resin as the matrix, combined with hollow glass microspheres, silica nanoparticles, far-infrared ceramic powder, and dispersing agents. The slurry is evenly dispersed, the coating has good formability, and it is suitable for continuous roll coating production.

[0023] The core cooling filler in this functional layer consists of rare earth lanthanum-doped barium titanate nanoparticles and two-dimensional black phosphorus nanosheets. The two fillers work synergistically to significantly improve infrared radiation heat dissipation efficiency, achieving passive radiative cooling of the exterior wall. The production ratio is strictly controlled, with the mass ratio of the two fillers controlled at (5-20):1. The ratio can be flexibly adjusted according to the temperature and working conditions in different regions.

[0024] Flexible thermal insulation core layer: As the main insulation structure of the product, it undertakes the core functions of thermal insulation, buffering, and noise reduction. It is made of a flexible substrate composed of diatomaceous earth porous flexible fiber composite felt and flexible polyurethane foam material. It has excellent flexibility, can adapt to slight deformation of the wall, and avoids cracking and damage. The overall thickness of the core layer is 3-15mm, and the bulk density is 80-150kg / m³. 3 With a thermal conductivity of ≤0.030W / (m·K), its thermal insulation performance is superior to that of conventional flexible exterior wall insulation materials.

[0025] During the production stage, carbonized organic aerogel particles are pre-filled inside the core layer substrate. After the particles are evenly dispersed, they can form a stable porous thermal insulation network structure, which greatly reduces air convection heat transfer and further enhances the thermal insulation effect. At the same time, it ensures the lightweight characteristics of the core layer and reduces the load on the external wall.

[0026] Waterproof and breathable adhesive underlayer: This is the innermost layer of the product that adheres to the wall. It uses a modified polyurethane flexible adhesive layer with a thickness of 0.3-0.6mm, serving multiple functions including bonding, waterproofing, and breathability. Micron-level ventilation holes are pre-drilled during the manufacturing process to allow moisture from inside the wall to escape, preventing dampness, bulging, and detachment. It also possesses excellent waterproof performance, specifically with a breathability of ≥300g / (㎡·24h) and a water pressure resistance of ≥0.3MPa, making it suitable for exterior walls in humid and rainy areas.

[0027] Interlayer interface bonding structure: To address the industry-wide issues of easy delamination and low peel strength in multilayer composite rolls, this product incorporates interpenetrating bonding layers between adjacent functional layers. This bonding layer requires no additional adhesive; utilizing the incomplete curing of the slurry layers, a coating and pressing process allows the materials of adjacent layers to permeate each other, curing in situ to form a unified structure. The production process is simple and cost-effective. After molding, the peel strength of adjacent layers is ≥1.2 N / mm, ensuring strong interlayer bonding and preventing delamination and peeling issues during long-term use.

[0028] This product integrates decoration, protection, radiant cooling, thermal insulation, waterproofing, breathability, and bonding. The integrated roll material allows for direct on-site installation, eliminating the need for multiple steps in traditional exterior wall insulation, decoration, and waterproofing, significantly shortening the construction cycle. Its flexible material is compatible with various exterior wall substrates, including brick-concrete, shear wall, and steel structures. It boasts strong weather resistance, low maintenance costs, and suitability for energy-saving renovations and new construction projects across different climate regions nationwide.

[0029] This preparation method involves continuous processes and controllable parameters, making it suitable for automated roll material production lines and enabling continuous batch production. The specific steps are as follows: S1. Core layer surface activation treatment First, the upper and lower surfaces of the flexible thermal insulation core layer are subjected to plasma activation treatment. The purpose is to increase the surface tension of the core layer, enhance the adhesion of subsequent coating slurries, and prevent interlayer delamination later. Production process parameters: processing power 80-120W, processing distance 5-10mm, production line travel speed 2-4m / min, and the surface wetting tension of the core layer after treatment ≥42mN / m to ensure the stability of the interface bonding.

[0030] S2. Preparation of functional slurries and pre-modification of the core layer According to the formula, radiant cooling functional layer slurry, flexible decorative protective surface layer slurry, and waterproof and breathable adhesive underlayer slurry were prepared separately. When preparing the radiant cooling slurry, a low-speed stirring + ultrasonic dispersion method was used to uniformly disperse rare earth lanthanum-doped barium titanate nanoparticles and two-dimensional black phosphorus nanosheets in the slurry system, avoiding agglomeration and failure of the nanofillers. Simultaneously, carbonized organic aerogel particles were premixed into the flexible thermal insulation core layer raw material, stirred evenly, and set aside to ensure a uniform and consistent thermal insulation structure in the core layer.

[0031] S3. Layered coating, pre-curing, and molding. The process employs an integrated molding method combining automated blade coating and pressure roller pressing. After activation treatment, the upper surface of the core layer is sequentially coated with a radiation cooling functional layer slurry and a flexible decorative protective top layer slurry. A waterproof and breathable adhesive underlayer slurry is then applied to the lower surface of the core layer. The coating speed on the production line is controlled at 1.5-3 m / min to suit mass production. Immediately after coating, the product enters a pre-curing process at 40-60℃ for 8-15 minutes to allow each coating to initially set, preventing sagging and uneven thickness, and ensuring consistent product appearance and performance.

[0032] S4. Segmented heating and overall curing The pre-cured composite substrate is fed into a constant temperature curing equipment and a segmented temperature-increasing curing process is adopted to avoid coating cracking, bubbling, and interlayer delamination caused by one-time high-temperature curing. This process is suitable for industrial mass production: the first stage is held at 50-60℃ for 20-30 minutes to remove moisture and small molecule solvents from the slurry; the second stage is held at 70-80℃ for 15-25 minutes to promote cross-linking and curing of the resin system; and the third stage is held at 90-100℃ for 10-15 minutes to complete deep curing and form a stable interpenetrating bonding layer.

[0033] S5. Post-processing and winding of finished product After curing, the composite roll material is naturally cooled to room temperature. After automatic trimming, flattening and winding, and quality inspection and sorting, the finished product of integrated thermal insulation, heat insulation, cooling and decoration soft material for exterior walls is obtained, which can be directly packaged and put into storage and shipped for application.

[0034] To verify the application effect of the product under different parameters, three independent implementation examples were designed based on the above formula and process parameter range. All implementation examples used the same production equipment and testing standards. The test environment was a normal temperature of 25℃ and a standard humidity environment. The core test indicators included thermal conductivity, interlayer peel strength, air permeability, water pressure resistance, external wall cooling effect, and bulk density.

[0035] Example 1 Production parameter settings Flexible decorative and protective surface layer: 0.1mm thick fluorocarbon modified acrylic coating with added UV-resistant additives; 0.2mm thick radiative cooling functional layer, composed of rare earth lanthanum-doped barium titanate nanoparticles and two-dimensional black phosphorus nanosheets in a 5:1 ratio; 3mm thick flexible thermal insulation core layer with a bulk density of 80kg / m³. 3 The thickness of the waterproof and breathable adhesive underlayer is 0.3mm; the lower limit of the parameters used in the preparation process are: plasma treatment power 80W, treatment distance 5mm, treatment speed 2m / min; coating speed 1.5m / min, pre-curing temperature 40℃, pre-curing 15min; segmented curing: 50℃ for 30min, 70℃ for 25min, 90℃ for 15min.

[0036] Actual performance data of finished products Thermal conductivity: 0.026 W / (m·K); interlayer peel strength: 1.25 N / mm; air permeability: 315 g / (m²·24h); water pressure resistance: 0.32 MPa; bulk density: 80 kg / m³ 3 The surface temperature drop of the exterior wall after 8 hours of outdoor sun exposure is 8.2℃; the thickness uniformity error is ≤±0.02mm; there are no defects such as delamination, bubbles, or cracks.

[0037] Application scenarios Suitable for areas with small indoor-outdoor temperature differences and low-rise building exterior wall renovation projects, the product is lightweight and thin, with extremely high construction efficiency and obvious cost-effectiveness advantages.

[0038] Example 2 Production parameter settings Flexible decorative and protective surface layer: A flexible inorganic mineral coating with a thickness of 0.3mm is used, along with UV-resistant and hydrophobic additives; Radiative cooling functional layer: 0.5mm thick, with rare earth lanthanum-doped barium titanate nanoparticles and two-dimensional black phosphorus nanosheets in a 12:1 ratio; Flexible thermal insulation core layer: 9mm thick, with a bulk density of 115kg / m³. 3The thickness of the waterproof and breathable adhesive underlayer is 0.45mm; the preparation process uses intermediate parameters: plasma treatment power 100W, treatment distance 7.5mm, treatment speed 3m / min; coating speed 2m / min, pre-curing temperature 50℃, pre-curing 12min; segmented curing: 55℃ for 25min, 75℃ for 20min, 95℃ for 12min.

[0039] Actual performance data of finished products Thermal conductivity: 0.022 W / (m·K); interlayer peel strength: 1.48 N / mm; air permeability: 360 g / (m²·24h); water pressure resistance: 0.38 MPa; bulk density: 115 kg / m³ 3 The surface temperature drop of the exterior wall after 8 hours of outdoor sun exposure is 11.5℃; the thickness uniformity error is ≤ ±0.01mm; the overall flatness and weather resistance are balanced, and there are no workmanship defects.

[0040] Application scenarios It is suitable for new and renovated exterior wall projects in most temperate regions across the country. It has a balanced performance in terms of heat preservation, cooling, waterproofing and decoration, and has the best overall cost performance. It is a universal formula for mass production.

[0041] Example 3 Production parameter settings Flexible decorative and protective surface layer: A flexible inorganic mineral coating, 0.5mm thick, with added UV-resistant and hydrophobic additives; Radiation cooling functional layer, 0.8mm thick, composed of rare earth lanthanum-doped barium titanate nanoparticles and two-dimensional black phosphorus nanosheets in a 20:1 ratio; Flexible thermal insulation core layer, 15mm thick, with a bulk density of 150kg / m³. 3 Waterproof and breathable adhesive base layer thickness: 0.6mm; Upper limit of parameters used in the preparation process: plasma treatment power 120W, treatment distance 10mm, treatment speed 4m / min; coating speed 3m / min, pre-curing temperature 60℃, pre-curing 8min; segmented curing: 60℃ for 20min, 80℃ for 15min, 100℃ for 10min.

[0042] Actual performance data of finished products Thermal conductivity: 0.019 W / (m·K); interlayer peel strength: 1.62 N / mm; air permeability: 410 g / (m²·24h); water pressure resistance: 0.45 MPa; bulk density: 150 kg / m³ 3 The exterior wall surface temperature drops by 14.3℃ after 8 hours of outdoor sun exposure; the product has high structural strength and excellent weather resistance, with no delamination or peeling issues.

[0043] Application scenarios Suitable for extreme climates such as severe cold, high temperature and sun exposure, and rain and humidity in the north, as well as key energy-saving projects for high-rise exterior walls and public buildings, it has the best thermal insulation and cooling performance, waterproof protection performance, and a longer service life.

[0044] Summary of the comparison of the effects of the three sets of examples As can be seen from the three sets of gradient parameter examples, with the increase of the thickness of each functional layer, the optimization of the nano-cooling filler ratio, and the increase of the core layer density, the thermal insulation, radiative cooling, waterproof bonding, and interlayer bonding performance of the product are steadily improved.

[0045] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0046] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A flexible material integrating thermal insulation, heat insulation, cooling, and decoration for exterior walls, characterized in that: It includes a flexible decorative protective surface layer, a radiant cooling functional layer, a flexible thermal insulation core layer, and a waterproof and breathable adhesive bottom layer, which are sequentially composited from the outside to the inside. The adjacent functional layers are combined into a flexible roll structure through a flexible adhesive system. The radiation cooling functional layer contains rare earth lanthanum-doped barium titanate nanoparticles and two-dimensional black phosphorus nanosheets as cooling functional fillers. The flexible thermal insulation core layer is a porous flexible fiber composite felt substrate, and the core layer is filled with organic aerogel particles.

2. The integrated thermal insulation, heat insulation, cooling, and decorative flexible material for exterior walls according to claim 1, characterized in that, The flexible decorative protective surface layer is a flexible inorganic mineral coating or a fluorocarbon modified acrylic coating with a thickness of 0.1-0.5 mm, and the surface layer contains UV-resistant additives and / or hydrophobic additives.

3. The integrated thermal insulation, heat insulation, cooling, and decorative flexible material for exterior walls according to claim 1, characterized in that, The radiation cooling functional layer is a polymer composite coating with a thickness of 0.2-0.8 mm. The raw materials include modified acrylic resin, hollow glass microspheres, silica nanoparticles, far-infrared ceramic powder, and dispersing agents. The ratio of rare earth lanthanum-doped barium titanate nanoparticles to two-dimensional black phosphorus nanosheets is (5-20):

1.

4. The integrated thermal insulation, heat insulation, cooling, and decorative flexible material for exterior walls according to claim 1, characterized in that, The flexible thermal insulation core layer is a flexible substrate composed of diatomaceous earth porous flexible fiber composite felt and flexible polyurethane foam material, with a thickness of 3-15mm and a bulk density of 80-150kg / m³. 3 The thermal conductivity is ≤0.030W / (m·K); the organic aerogel particles are carbonized organic aerogel particles, which are dispersed inside the core layer to form a porous thermal insulation network structure.

5. The integrated thermal insulation, heat insulation, cooling, and decorative flexible material for exterior walls according to claim 1, characterized in that, The waterproof and breathable adhesive base layer is a modified polyurethane flexible adhesive layer with a thickness of 0.3-0.6mm. The base layer is provided with micron-level breathable pores, with an air permeability of ≥300g / (㎡·24h) and a water pressure resistance of ≥0.3MPa.

6. The integrated thermal insulation, heat insulation, cooling, and decorative flexible material for exterior walls according to claim 1, characterized in that, An interpenetrating interface bonding layer is provided between two adjacent functional layers. The interpenetrating interface bonding layer is formed by the mutual penetration and in-situ curing of the materials of the adjacent layers when they are not fully cured. The interfacial peel strength between each adjacent layer is ≥1.2N / mm.

7. A method for preparing the integrated thermal insulation, heat insulation, cooling, and decorative flexible material for exterior walls according to any one of claims 1-6, characterized in that, Includes the following steps: S1. Surface activation treatment is performed on the upper and lower surfaces of the flexible thermal insulation core layer to improve interfacial adhesion; S2. Prepare radiative cooling functional layer slurry, flexible decorative protective surface layer slurry and waterproof and breathable adhesive bottom layer slurry respectively, and disperse rare earth lanthanum doped barium titanate nanoparticles and two-dimensional black phosphorus nanosheets in the radiative cooling functional layer slurry; premix organic aerogel particles into the flexible thermal insulation core layer. S3. The radiative cooling functional layer slurry and the flexible decorative protective surface layer slurry are sequentially applied to the upper surface of the flexible thermal insulation core layer after surface activation treatment, and the waterproof and breathable adhesive underlayer slurry is applied to the lower surface of the core layer. S4. The coated composite substrate is fed into a curing equipment for curing treatment, so that the interfaces of each layer form a bonded structure, and an integrated flexible roll material is obtained. S5. After curing, the material is cooled, rolled up, and trimmed to obtain the finished soft material.

8. The preparation method according to claim 7, characterized in that, In step S1, the surface activation treatment adopts plasma treatment with a treatment power of 80-120W, a treatment distance of 5-10mm, a treatment speed of 2-4m / min, and the surface wetting tension of the core layer after treatment is ≥42mN / m.

9. The preparation method according to claim 7, characterized in that, In step S3, each functional layer is formed by doctor blade coating combined with pressure roller pressing. The coating speed is 1.5-3m / min. After coating, pre-curing is performed at a temperature of 40-60℃ for 8-15min.

10. The preparation method according to claim 7, characterized in that, In step S4, the curing process adopts a segmented heating curing process, including: the first stage is held at 50-60℃ for 20-30 minutes, the second stage is held at 70-80℃ for 15-25 minutes, and the third stage is held at 90-100℃ for 10-15 minutes.

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