Organic and inorganic composite flexible building insulation floating coating

Abstract

The present invention provides an organic and inorganic composite flexible building thermal insulation floating coating, and relates to the technical field of building coatings, the organic and inorganic composite flexible building thermal insulation floating coating comprises 1-10% of a flexible thermal insulation component, 1-20% of a rigid thermal insulation component, 0.1-1% of a tough material, 10-20% of an emulsion, 1-3% of an auxiliary agent, and 52-55% of water, according to the technical scheme, a distributed matching and combined fusion scheme is adopted, so that the aerogel material is uniformly mixed in the floating coating, a building outer wall heat insulation layer is directly realized through a brushing scheme instead of a traditional aerogel material plate hanging scheme, the construction effect is improved, and the building construction difficulty is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building coatings, in particular to an organic and inorganic composite flexible building thermal insulation mid-coat coating. BACKGROUND

[0002] According to the preparation method of aerogel thermal insulation material and aerogel thermal insulation material disclosed in Chinese patent No. CN115108758A, and according to the aerogel modified thermal insulation material disclosed in Chinese patent No. CN112374907A.

[0003] The above patent documents all explain that aerogel has great application prospect in the field of building thermal insulation. However, in the above patent and existing technical data, aerogel material needs to be finally formed into a thermal insulation board structure for building surface hanging application. Although CN112374907A mentions a patent scheme for brushing, the preparation of the technical scheme still needs to be prepared into a thermal insulation board for hanging construction, and cannot realize direct brushing operation. The brushing described in the patent document should be understood as a fixed scheme and fixed brushing of the thermal insulation board, not the material brushing construction. The fixed brushing of this technology has a high probability, so it still cannot solve the construction difficulty and technical problem of directly brushing aerogel material on the building surface. How to uniformly and stably disperse the aerogel material in the water-based coating system, ensure that its performance is fully played, and at the same time ensure the storage stability and construction performance of the coating, is a technical problem that needs to be solved in the field. SUMMARY

[0004] Technical problems to be solved

[0005] In view of the deficiencies of the prior art, the present application provides an organic and inorganic composite flexible building thermal insulation mid-coat coating, which solves the problem that the prior art cannot be directly brushed on the building wall.

[0006] Technical scheme

[0007] To achieve the above purpose, the present application is realized by the following technical scheme: an organic and inorganic composite flexible building thermal insulation mid-coat coating, characterized in that: the coating is a stable water dispersion, and its components include, by weight percentage:

[0008] Flexible thermal insulation component: 1-10%;

[0009] Rigid thermal insulation component: 1-20%, the rigid thermal insulation component comprises silica aerogel fibers or silica aerogel particles;

[0010] Tough material: 0.1-1%;

[0011] Emulsion: 10-20%;

[0012] Additives: 1-3%;

[0013] Water: 52-55%.

[0014] Preferably, the flexible heat-insulating component is polymer polyurethane expansion particles or rubber particles.

[0015] Preferably, the rigid thermal insulation component contains, in addition to silica aerogel fibers or silica aerogel particles, at least one inorganic porous material selected from nano-ceramic microspheres, closed-cell glass microspheres, perlite, expanded glass microspheres, and foamed ceramics, and the silica aerogel is used in combination with other inorganic porous materials.

[0016] Preferably, the tough material is polymer fiber, cellulose material or nano-reinforced material.

[0017] Preferably, the auxiliary agent includes one or more of a dispersant, a thickener, a film-forming aid, an antifreeze agent, and an antifungal agent.

[0018] Preferably, the coating has an apparent viscosity greater than 130 KU as a water dispersion, and has no obvious liquid-solid phase separation after being placed at 50° C. for 96 hours, and is not prone to stratification within one year of storage at room temperature.

[0019] Preferably, the preparation method comprises the following steps:

[0020] S1: Pre-dispersion stage: Add the formulated amount of water, part of the additives and the emulsion into the dispersing equipment and stir them evenly at medium or low speed to form a basic mixed liquid;

[0021] S2: Organic phase and toughness material introduction stage: gradually add the flexible thermal insulation component and toughness material to the basic mixed solution obtained in step S1, and continue stirring until they are initially evenly dispersed to obtain an organic phase premix;

[0022] S3: Inorganic phase introduction and key dispersion stage: To the organic phase premix obtained in step S2, the rigid thermal insulation component including silica aerogel fibers or silica aerogel particles and the remaining additives are gradually added, and then high-speed shear dispersion is performed in a dispersion equipment to form a stable dispersed phase of silica aerogel and other rigid thermal insulation materials in the aqueous emulsion system to obtain a preliminary coating;

[0023] S4: homogenization and blending stage: for the preliminary coating obtained in step S3, the stirring rate is adjusted and the stirring is continued for a certain period of time to ensure that the system is uniform and stable to obtain the finished coating;

[0024] The shear force of the dispersion equipment is achieved by a composite dispersion design with paddles and a rotating disk, or one or more combinations of paddles, dispersion disks, and frame stirring. The entire preparation process is carried out at a room temperature of less than 50° C., and the total dispersion time is controlled within 60 minutes, of which the high-speed shear dispersion time is less than 20 minutes.

[0025] Preferably, in step S3, the silica aerogel fibers or silica aerogel particles are pre-mixed with other rigid thermal insulation component materials by dry or wet method before being added.

[0026] Preferably, the dispersing equipment adopts stepless speed control to control the rotation speed so as to adapt to the shear force requirements of different material addition stages in steps S2 and S3.

[0027] Preferably, the rotation speed of the high-speed shear dispersion in step S3 is 1000-3000 rpm.

[0028] Preferably, the order of adding the flexible thermal insulation component and the tough material in step S2, or the order of adding different rigid thermal insulation component materials in step S3, is optimized and adjusted according to their dispersibility in the system and their influence on the stability of the system.

[0029] Beneficial effects

[0030] The present invention provides an organic and inorganic composite flexible building insulation mid-coat. It has the following beneficial effects:

[0031] The present invention adopts a dispersed proportioning and combined fusion scheme to achieve uniform mixing of aerogel materials in the mid-coat paint, thereby realizing a scheme in which the thermal insulation layer of the building exterior wall is directly realized by painting, rather than the traditional aerogel material plate hanging, thereby improving the construction effect and reducing the difficulty of building construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a flow chart of the preparation process of the present invention. DETAILED DESCRIPTION

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention. Specific embodiment one:

[0035] like Figure 1As shown, organic and inorganic composite flexible building insulation mid-coat coating is mainly prepared by specific ratio and process of flexible insulation component, rigid insulation component, toughness material, film-forming emulsion, functional additive and water. Flexible insulation component accounts for 1-10% of the coating total weight. Its main function is to give coating certain flexibility and elasticity, absorb stress, and provide partial insulation effect simultaneously. Preferably, polymer elastic particles with hollow or closed-cell structure are adopted, including hollow expanded polyurethane particles, closed-cell rubber particles (surface-treated fine particles such as EPDM particles, SBR particles). These materials themselves have certain heat-insulating properties, and their elastic structure can effectively improve the deformation resistance of coating.

[0036] The rigid thermal insulation component accounts for 1-20% of the total weight of the coating. This is the core component for achieving efficient thermal insulation of the coating. The key to the present invention is the introduction of silica aerogel fibers or silica aerogel particles, the average particle size or fiber length of which is controlled at 1 micron to 500 microns to facilitate dispersion and film formation. Due to its unique three-dimensional nanoporous structure, the movement of air molecules inside silica aerogel is restricted, giving it an extremely low thermal conductivity (including as low as 0.013-0.020W / (m·K)) and an extremely low density. In the present invention, the weight proportion of silica aerogel in the entire rigid thermal insulation component is 5-80%, and the specific proportion is adjusted according to the target thermal conductivity and cost.

[0037] To further optimize thermal insulation performance and reduce costs, the rigid insulation component can also contain other inorganic low-thermal conductivity materials, including nanoscale hollow ceramic microspheres, closed-cell expanded glass microspheres, and modified perlite. These materials form a graded structure with the silica aerogel, whereby insulating fillers of varying particle sizes interpenetrate, reducing accumulated voids and improving the density of the insulation layer and overall thermal insulation effectiveness.

[0038] The toughening material accounts for 0.1-1% of the total coating weight. Its function is to form a reinforcing network after the coating cures, improving the coating's tensile strength, crack resistance, and impact resistance, while further enhancing its flexibility. Possible toughening materials include polymer staple fibers (including polypropylene fibers, polyester fibers, and polyvinyl alcohol fibers, ranging in length from 1-6 mm), polymer emulsions that enhance system toughness (as supplementary bonding and toughening), and water-soluble polymers such as cellulose ethers (including hydroxypropyl methylcellulose (HPMC) and hydroxyethyl cellulose (HEC), which also thicken and retain water and improve workability).

[0039] The film-forming emulsion accounts for 10-20% of the total weight of the coating. It is the coating's binder, responsible for bonding the various powdered and granular insulation components and toughness materials together, and forming a continuous, dense coating film after drying. At the same time, the performance of the emulsion directly affects key indicators such as the coating's adhesion, water resistance, and weather resistance. The present invention preferably uses acrylic emulsions, styrene-acrylate (styrene acrylic) emulsions, or silicone-modified acrylic emulsions with good water resistance and adhesion to the substrate. Silicone modification can further improve the emulsion's hydrophobicity, stain resistance, and weather resistance.

[0040] Functional additives account for 1-3% of the total weight of the coating. They are of various types and have different functions. They are necessary to optimize the production, storage, construction and final film-forming properties of the coating. They mainly include:

[0041] Dispersants: Especially for difficult-to-disperse materials such as silica aerogel, it is necessary to select efficient wetting and dispersing agents (including polycarboxylates and polymer dispersants with special anchoring groups) to reduce their surface tension, improve their wettability in aqueous systems, and prevent them from reaggregating through steric hindrance or electrostatic repulsion.

[0042] Thickeners: Used to adjust the viscosity and rheological properties of coatings, imparting good storage stability (anti-settling) and workability (including anti-sagging). Commonly used thickeners include cellulose ethers, associative polyurethane thickeners, and alkali-swellable thickeners. Thixotropic thickeners maintain high viscosity when the coating is static, but reduce viscosity under shear forces (including stirring and spraying), facilitating application.

[0043] Film-forming aids: including alcohol ester dodecanol, propylene glycol phenyl ether, etc., which can reduce the minimum film-forming temperature (MFFT) of the emulsion and promote the full polymerization of emulsion particles at a lower temperature to form a continuous and dense coating film.

[0044] Other additives: may also include pH regulators (including AMP-95 and ammonia water, used to adjust the pH of the system to ensure the stability and activity of the emulsion and additives), defoamers (to eliminate bubbles generated during production and construction), antifreeze agents (including ethylene glycol and propylene glycol, to improve the freeze-thaw stability of the coating), mildew inhibitors (to prevent the coating from growing mold during storage and use), etc.

[0045] Water serves as a dispersion medium and solvent, comprising 52-55% of the total weight of the coating.

[0046] The preparation method of the present invention ensures the performance and stability of the final product by dispersing the silicon dioxide aerogel.

[0047] S1: Base Liquid Preparation: This stage primarily involves mixing water, some shear-insensitive, easily soluble or dispersible additives (including wetting and dispersing agents and pH adjusters), and some emulsion. Medium-to-low speed stirring is used to avoid excessive bubbles and ensure that all components are fully dissolved or pre-dispersed, providing a stable base environment for the subsequent addition of materials. Anchor or frame agitators are suitable for handling medium-to-high viscosity materials and provide excellent macro-mixing effects.

[0048] S2: Premixing of the Flexible and Tough Components: The flexible insulation component (including expanded polyurethane particles) and the tough material (including polypropylene staple fibers) vary in density and morphology. Slow addition and continuous stirring ensure initial wetting and uniform dispersion of these materials within the base liquid to prevent agglomeration. The stirring speed in this stage is slightly higher than in S1 to provide sufficient momentum to disperse the particles and fibers.

[0049] S3: The critical dispersion stage of the rigid insulation component (including aerogel): This is the core and most challenging part of the entire preparation process. Due to its extremely low density, high specific surface area, and unique surface properties (possibly hydrophobic or highly polar), silica aerogels are prone to agglomeration and are difficult to disperse uniformly in aqueous systems.

[0050] Pre-dispersion to form concentrated slurry A: Aerogel and other rigid insulation materials are pre-dispersed with the remaining water, emulsion, and key additives (including a high-efficiency dispersant and some thickeners) in a separate high-speed dispersing device to form a concentrated slurry with a relatively high solids content but good fluidity. This approach has the following advantages: 1) the dispersant can more effectively act on the aerogel surface within a small system; and 2) it provides a "tamed" aerogel premix for subsequent addition to the larger system.

[0051] Slow addition and high-speed shear: Slowly adding concentrated slurry A to the flexible premixed slurry prepared by S2 can avoid dispersion difficulties caused by local excessive solid content or sudden changes in viscosity. Subsequently, it is crucial to start the high-speed shear dispersion function. The high-speed rotating dispersion disk (including those with serrated edges) or rotor-stator homogenizing head can generate strong shear force, impact force and cavitation effect, breaking up the aerogel agglomerates (especially secondary agglomerates) and evenly dispersing its fine particles into the liquid phase. The rotation speed, time and selection of the dispersion disk / head are key process parameters.

[0052] S4: Homogenization and Finished Product Preparation: After high-speed dispersion, the system is essentially uniform, but there may be a small amount of incompletely dispersed particles or bubbles introduced by high-speed mixing. Switch to medium-to-low speed mixing for homogenization, ensuring uniform composition and state throughout the system. Thickener can be added as needed at this point to precisely adjust the final coating viscosity to meet application requirements. Degassing (natural or vacuum degassing) helps improve the coating's density and aesthetics.

[0053] The temperature control of the whole process (15℃ to 45℃) is to protect the activity of the emulsion and certain additives and prevent demulsification or performance degradation due to excessive temperature.

[0054] Dry premixing (the preferred embodiment of claim 8): For extremely light, airy, and easily adsorbed powders like aerogels, dry premixing is performed first. This involves using a V-type mixer, which utilizes its gentle tumbling and shearing action to initially break up loose agglomerates formed during storage and transportation, allowing for uniform mixing with other denser powders (including ceramic microbeads). This not only improves the operating environment but also makes the aerogel more easily captured and wetted by the liquid during subsequent wet dispersion, enhancing dispersion efficiency and uniformity. Specific embodiment two:

[0056] Based on the technical solution of the specific embodiment 1, a detailed formula A is further given: a universal high-efficiency thermal insulation mid-coat:

[0057] Flexible thermal insulation component: hollow expanded polyurethane particles (average particle size 200 μm) 6%;

[0058] Rigid insulation components:

[0059] Silica aerogel particles (average particle size 50 μm) 5% (accounting for about 33.3% of the rigid component);

[0060] Closed-cell expanded glass microspheres (average particle size 100 μm) 10%;

[0061] Tough material: polypropylene short fiber (length 3mm) 0.5%;

[0062] Film-forming emulsion: styrene-acrylate emulsion (solid content 50%) 15%;

[0063] Functional additives:

[0064] High-efficiency polymer dispersant 0.8%;

[0065] Thixotropic polyurethane thickener 0.5%;

[0066] Film-forming aid (alcohol ester twelve) 0.5%;

[0067] Defoaming agent 0.2%;

[0068] pH adjuster (AMP-95) 0.1%;

[0069] Antifungal agent 0.1%;

[0070] Water: 51.3% (the remainder is added to 100%);

[0071] Preparation method:

[0072] S1: 35 parts of water, 0.1 parts of pH regulator, 0.4 parts of dispersant and 5 parts of styrene-acrylate emulsion were added to a dispersion kettle with an anchor stirrer and stirred at 150 rpm for 10 minutes to form a basic mixed solution.

[0073] S2: Under stirring, 6 parts of hollow expanded polyurethane particles and 0.5 parts of polypropylene short fibers were slowly added to the basic mixed solution, and stirred at 200 rpm for 20 minutes to form a flexible premixed slurry.

[0074] S3: In another container, mix 16.3 parts water, 10 parts styrene-acrylate emulsion, 0.4 parts dispersant, 0.5 parts film-forming aid, 0.2 parts defoamer, 0.1 parts mildewcide, 5 parts silica aerogel particles, and 10 parts closed-cell expanded glass microspheres. Pre-disperse the mixture at 800 rpm for 10 minutes using a high-speed disperser with a serrated disperser disc to form concentrated slurry A. Slowly add concentrated slurry A to the flexible premixed slurry prepared in S2. Then, high-speed shear disperse the contents of the dispersion kettle using a high-speed disperser disc at 2000 rpm for 20 minutes. Maintain the material temperature at no more than 40°C throughout the entire process.

[0075] S4: Reduce stirring speed to 100 rpm, add 0.5 parts of thixotropic polyurethane thickener, and continue stirring for 15 minutes to homogenize and degas. The coating viscosity is approximately 140 kU. Discharge and seal.

[0076] The resulting coating is uniform and fine, free of agglomerates, and exhibits excellent storage stability. Applied at a thickness of 3-4mm, the cured coating is expected to have a thermal conductivity of approximately 0.042W / (m·K), exhibit good flexibility (no cracking with a 50cm radius bend), and achieve a bond strength of 0.9MPa with the cement mortar base, with acceptable impermeability. Specific embodiment three:

[0078] Based on the technical solution of the specific embodiment 1, a detailed formula B is further provided: a thin layer of high-efficiency thermal insulation coating with high aerogel content:

[0079] Recipe composition:

[0080] Flexible thermal insulation component: hollow expanded polyurethane particles (average particle size 150 μm) 3%;

[0081] Rigid insulation components:

[0082] 10% silica aerogel particles (average particle size 30 μm) (accounting for approximately 66.7% of the rigid component);

[0083] Closed-cell expanded glass microspheres (average particle size 80 μm) 5%;

[0084] Tough material: polyacrylonitrile fiber (length 2mm) 0.4%;

[0085] Film-forming emulsion: pure acrylic emulsion (solid content 50%) 12%;

[0086] Functional additives:

[0087] High-efficiency nonionic dispersant 1.2%;

[0088] Thixotropic cellulose ether thickener 0.4%;

[0089] Film-forming aid (alcohol ester twelve) 0.6%;

[0090] Defoaming agent 0.25%;

[0091] pH adjuster 0.1%;

[0092] Antifungal agent 0.15%;

[0093] Water: 66.9% (the remainder is added to 100%);

[0094] Preparation method:

[0095] Basically the same as steps S1-S4 of Example 1.

[0096] Before step S3, 10 parts of silica aerogel particles and 5 parts of closed-cell expanded glass microspheres were pre-mixed by dry method: using a V-type mixer for 15 minutes.

[0097] In S3, the preparation of concentrated slurry A and the subsequent high-speed shear dispersion are more critical to the wetting and depolymerization of aerogel. The high-speed shear time can be appropriately extended to 20 minutes and the rotation speed can be 1500 rpm.

[0098] In S4, the final viscosity is adjusted to approximately 145 KU to accommodate spray or batch application.

[0099] Due to the high aerogel content, the coating is expected to have a lower thermal conductivity (e.g., close to 0.038 W / (m·K)), and can achieve significant thermal insulation even with extremely thin coatings (e.g., 2-3 mm). This requires higher control over the preparation process to ensure sufficient dispersion of the aerogel and stability of the system.

[0100] The organic and inorganic composite flexible building thermal insulation mid-coat of the present invention can be widely used in energy-saving and thermal insulation projects of new buildings and energy-saving renovation projects of existing buildings.

[0101] Exterior wall insulation system: This system serves as the core insulation layer, sprayed or batch-coated directly onto the leveled base wall, forming a continuous insulation layer 3-4mm thick. A crack-resistant mortar composited with alkali-resistant fiberglass mesh can be applied directly on top as a crack-resistant protective layer, followed by a flexible water-resistant putty and exterior wall finish. Due to its excellent flexibility and bond strength, this coating effectively reduces the risk of cracking throughout the system, and its continuous, seamless nature prevents thermal bridges.

[0102] Exterior wall insulation system: For buildings where exterior wall insulation retrofits are inconvenient or for interior spaces with specific requirements, this coating can also be used as an interior insulation material. Directly applied to the interior wall, it forms a thin 3-4mm insulation layer, minimizing the indoor space. It's quick and easy to apply, and is non-toxic and environmentally friendly.

[0103] Roof Insulation: This product can be applied to flat or pitched roofs for thermal insulation. Spraying or batch coating on the roof base creates a continuous, flexible, waterproof, and thermally insulating coating (a topcoat is required for complete waterproofing). This effectively reduces solar heat gain in summer and heat loss in winter. Its lightweight properties make it a good choice for roof load-bearing applications.

[0104] During construction, the base should be solid, flat, clean, and dry, free of oil, dust, and other debris. High-pressure airless spray or manual batch coating can be used, typically in one or two coats, to the desired thickness. Each coat should be applied sparingly, and the next should be applied only after the previous coat has dried. The ideal construction temperature is between 5°C and 35°C, with a relative humidity no greater than 85%.

[0105] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further restrictions, an element defined by the statement "comprising a reference structure" does not exclude the presence of additional identical elements in the process, method, article, or device comprising the element.

[0106] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. Organic and inorganic composite flexible building thermal insulation mid-coat, characterized by: The coating is a stable aqueous dispersion, and its components, calculated by weight percentage, include: Flexible thermal insulation component: 1-10%; Rigid thermal insulation component: 1-20%, wherein the rigid thermal insulation component comprises silica aerogel fibers or silica aerogel particles; Tough materials: 0.1-1%; Emulsion: 10-20%; Additives: 1-3%; Water: 52-55%.

2. The organic and inorganic composite flexible building thermal insulation mid-coat according to claim 1, characterized in that: The flexible heat-insulating components are polymer polyurethane expansion particles or rubber particles.

3. The organic and inorganic composite flexible building thermal insulation mid-coat according to claim 1, characterized in that: The rigid thermal insulation component further comprises at least one inorganic porous material selected from nano ceramic microspheres, closed-cell glass microspheres, perlite, expanded glass microspheres, and foamed ceramics, and the silica aerogel is compounded with other inorganic porous materials for use.

4. The organic and inorganic composite flexible building thermal insulation mid-coat according to claim 1, characterized in that: The tough material is any one of polymer fibers, cellulose materials or nano-reinforced materials, or any combination of multiple thereof.

5. The organic and inorganic composite flexible building thermal insulation mid-coat according to claim 1, characterized in that: The auxiliary agent includes any one or any combination of dispersants, thickeners, film-forming agents, antifreeze agents, and mildew inhibitors.

6. The organic and inorganic composite flexible building thermal insulation mid-coat according to claim 1, characterized in that: The coating has an apparent viscosity greater than 130 KU as an aqueous dispersion.

7. The method for preparing the organic and inorganic composite flexible building thermal insulation mid-coat according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1: Pre-dispersion stage: Add the formulated amount of water, 10%-50% of the additives and the emulsion into the dispersing equipment and stir evenly at a medium-low speed to form a basic mixed liquid; S2: Organic phase and toughness material introduction stage: gradually add the flexible thermal insulation component and toughness material to the basic mixed solution obtained in step S1, and continue stirring until they are initially evenly dispersed to obtain an organic phase premix; S3: Inorganic phase introduction and key dispersion stage: To the organic phase premix obtained in step S2, the rigid thermal insulation component including silica aerogel fibers or silica aerogel particles and the remaining additives are gradually added, and then high-speed shear dispersion is performed in a dispersion equipment to form a stable dispersed phase of silica aerogel and other rigid thermal insulation materials in the aqueous emulsion system to obtain a preliminary coating; S4: homogenization and blending stage: for the preliminary coating obtained in step S3, the stirring rate is adjusted and the stirring is continued until the system is homogenized and stable to obtain the finished coating; The shear force of the dispersion equipment is achieved by one or a combination of a paddle, a rotating disk or a paddle, a dispersion disk, and a frame mixer; the entire preparation process is carried out at a room temperature of less than 50°C, and the total dispersion time is controlled within 60 minutes, of which the high-speed shear dispersion time is less than 20 minutes.

8. The method for preparing the organic and inorganic composite flexible building thermal insulation mid-coat according to claim 7, characterized in that: In step S3, the silica aerogel fibers or silica aerogel particles are pre-mixed with other rigid thermal insulation component materials by dry or wet method before being added.

9. The method for preparing the organic and inorganic composite flexible building thermal insulation mid-coat according to claim 7, characterized in that: The dispersing equipment adopts stepless speed control to control the rotation speed, so as to adapt to the shear force requirements of different material addition stages in steps S2 and S3.

10. The method for preparing the organic and inorganic composite flexible building thermal insulation mid-coat according to claim 7, characterized in that: The rotation speed of the high-speed shear dispersion in step S3 is 1000-3000 rpm.

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