Interior wall insulation board and preparation method thereof

Abstract

The invention relates to an interior wall insulation board which comprises a cement shell and a core material. The core material sequentially comprises an aerogel filling area, an air bag wrapping body, a hard foam wrapping layer and alkaline gridding cloth from inside to outside; the air bag wrapping body is prepared by filling air into a plastic air bag; the alkaline gridding cloth is bonded by resin and covers the outside of the rigid foam wrapping layer, and the alkaline gridding cloth is used for improving the bonding strength between the cement shell layer and the core material. The air bag wrapping body is used as a flexible buffer layer and a sealing layer of aerogel, a buffer effect is provided, water absorption and structural collapse of the aerogel are also avoided, the hard foam wrapping layer can provide a hard supporting layer for the air bag wrapping body and the aerogel particles in the hard foam wrapping layer, and the compressive strength of the core material and the whole insulation board is improved. According to the invention, the flexible buffer layer and the hard support layer are adopted, so that the problem of stress fracture or structural damage of the aerogel layer due to factors such as external extrusion collision or water absorption in production, installation and use links is effectively avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of building materials, and in particular to an interior wall insulation board and a preparation method thereof. Background Art

[0002] Walls are crucial structures for heat exchange in buildings. Installing thermal insulation panels on building walls effectively insulates them, effectively maintaining stable indoor temperatures and reducing energy consumption for heating and cooling, contributing to energy conservation and emissions reduction in the construction industry. Traditional insulation systems utilize prefabricated insulation panels, made by sandwiching a core material such as polyurethane, polystyrene, or rock wool between cement panels. These panels are then secured to the wall surface using cement mortar and bolts or metal clips, serving as an insulation layer. Due to the inherent thermal conductivity of the core material, these systems not only have limited insulation effectiveness but are also thick and heavy, taking up space and making installation unstable and prone to falling off. The compressive strength of insulation panels is also a key consideration. If the compressive strength is too low, they can only be used for exterior wall insulation and cannot support rooftop loads. Therefore, the market urgently needs a new wall insulation system that offers excellent insulation performance, is thinner, lighter, and maintains adequate compressive strength. Summary of the Invention

[0003] (1) Technical issues to be resolved

[0004] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides an interior wall insulation board and a preparation method thereof. By using an airbag enclosure to wrap aerogel as a core material, an insulation brick with light specific gravity, high thermal insulation efficiency, good flame retardancy and high compressive strength is produced, which solves the technical problems of the existing thermal insulation board core material with high thermal conductivity, poor thermal insulation effect, high specific gravity, unstable installation and low strength.

[0005] (2) Technical solution

[0006] The present invention provides an interior wall insulation board, which includes: a cement shell and a core material; the core material is composed of an aerogel filling area, an airbag enclosure, a hard foam enclosure layer and an alkaline mesh cloth from the inside to the outside; the airbag enclosure is made by filling the interior of a plastic airbag with gas; the alkaline mesh cloth is bonded with resin and coated on the outside of the hard foam enclosure layer, and the alkaline mesh cloth is used to improve the bonding strength between the cement shell layer 10 and the core material 20.

[0007] According to a preferred embodiment of the present invention, the aerogel in the aerogel-filled region comprises hydrophobic aluminum silicate aerogel particles supplemented with 5% nano-aluminum hydroxide. The hydrophobic aluminum silicate aerogel has a thermal conductivity of ≤0.025 W / (m·K) and is non-combustible. The 5% nano-aluminum hydroxide is added as a flame retardant synergist.

[0008] According to a preferred embodiment of the present invention, the airbag enclosure is made of one of polyimide (PI) film, PC film (polycarbonate film), PET film (polyethylene terephthalate film), PMMA film (polymethyl methacrylate film), PP film (polypropylene film), and PS film (polystyrene film), preferably polyimide (PI) film. Polyimide (PI) film has a limiting oxygen index of ≥36%, is heat-resistant to 400°C, and is non-flammable. Filling the airbag with nitrogen or carbon dioxide provides a flame retardant effect.

[0009] According to a preferred embodiment of the present invention, the rigid foam wrapping layer is graphite-modified EPS or phenolic foam. Graphite-modified EPS is flame-retardant with an oxygen index of ≥30%; phenolic foam is a B1 fireproof material with an oxygen index of ≥36%, and burning dripping is self-extinguishing in ≤5 seconds.

[0010] According to a preferred embodiment of the present invention, the alkaline mesh is impregnated with a phosphate-modified resin adhesive; the phosphate-modified resin adhesive is made from phenolic resin with 10% by weight of ammonium polyphosphate added. The phosphate-modified resin adhesive forms an intumescent flame-retardant coating that expands in the presence of fire, sealing pores and isolating oxygen.

[0011] According to a preferred embodiment of the present invention, the cement shell is added with 10-15% ultrafine silica fume, 1-5% cellulose fiber and 15-20% hollow glass microspheres (microsphere density 0.15-0.25g / cm 3 ) is cast by magnesium phosphate cement slurry.

[0012] According to a preferred embodiment of the present invention, ceramic fiber nails (temperature resistant to 1200° C.) are embedded in the cement shell to replace metal connectors and avoid high-temperature heat conduction.

[0013] According to a preferred embodiment of the present invention, basalt fiber mesh cloth is embedded in the cement shell.

[0014] According to a preferred embodiment of the present invention, the thickness of the aerogel filling area is 7-10 mm, the thickness of the airbag wrapping body is 6-8 mm, the thickness of the hard foam wrapping layer is 6-8 mm, and the thickness of the cement shell is 8-10 mm.

[0015] In a second aspect, the present invention provides a method for preparing an interior wall insulation board, comprising the following steps:

[0016] S1. Filling the airbag with gas to form a bag, placing dry aerogel particles in the bag, and sealing the bag to obtain an aerogel-filled airbag enclosure;

[0017] S2. Encapsulate the airbag enclosure within the two half boxes that form the rigid foam wrapping layer, apply waterproof glue to the joints of the two half boxes to seal them, and the two half boxes form the rigid foam wrapping layer;

[0018] S3, after applying phenolic resin glue on the inner side of the alkaline mesh cloth, wrapping it on the outside of the rigid foam wrapping layer, and drying it to obtain a core material;

[0019] S4. First, pour a layer of cement slurry in the mold, and then place the core material into the mold. There is a gap between the core material and the inner wall of the mold. Continue pouring cement slurry until the mold is filled and the upper surface of the core material is covered to a predetermined thickness. During the pouring process, vibrate and exhaust. After the pouring is completed, solidify and maintain.

[0020] According to a preferred embodiment of the present invention, step S4 further includes: pre-embedding ceramic fiber nails at both sides of the mold so that they are located within the distance between the core material and the mold; the length of the ceramic fiber nails is greater than the depth of the mold, and a plurality of protrusions are dispersed on the surface of the lower end thereof; pouring the cement slurry continuously until the mold is filled and the upper surface of the core material is covered to a predetermined thickness; vibrating and exhausting the air during the pouring process; and curing and curing after the pouring is completed.

[0021] According to a preferred embodiment of the present invention, S4 also includes: the lower end of the ceramic fiber nail is connected to the first basalt fiber mesh cloth, and the first basalt fiber mesh cloth is supported on the bottom cap end of the ceramic fiber nail so that there is a gap between the first basalt fiber mesh cloth and the bottom of the mold; first, a layer of cement slurry is poured to cover the first basalt fiber mesh cloth, and then the core material is placed in the mold so that there is a gap between the core material and the inner wall of the mold, and the cement slurry is continued to be poured until it reaches the upper surface of the core material, and then the second basalt fiber mesh cloth is connected to the upper end of the ceramic fiber nail so that the second basalt fiber mesh cloth is close to the upper surface of the core material, and the cement slurry is continued to be poured until the mold is filled and covered with the second basalt fiber mesh cloth; vibration exhaust is performed during the pouring process, and after the pouring is completed, it is cured and maintained.

[0022] (3) Beneficial effects

[0023] The high-strength insulation board of the present invention has the following technical advantages:

[0024] (1) The present invention adopts a three-layer composite of aerogel particles, airbag inclusions and hard foam inclusions to make the core material of the insulation board. At the same thickness, it has excellent thermal insulation performance. The thermal conductivity coefficient of the aerogel and airbag inclusions is extremely low, and the weight is extremely light. Under the premise of the same thermal insulation effect, the high-strength insulation board of the present invention has a smaller thickness and weight, which helps the insulation board to be firmly installed on the interior wall (or exterior wall) of the building.

[0025] (2) The present invention uses an airbag enclosure as a flexible buffer layer and sealing layer for the aerogel, providing a buffering effect and preventing the aerogel from absorbing water and collapsing the structure. The rigid foam enclosure can provide a rigid support layer for the internal airbag enclosure and aerogel particles, thereby improving the compressive strength of the core material and the entire insulation board. The present invention adopts a "flexible buffer layer + rigid support layer" to effectively avoid the problem of the aerogel layer being broken or structurally damaged due to external extrusion, collision, or water absorption during production, installation, and use. Among them, the alkaline mesh cloth is bonded with resin and coated on the outside of the rigid foam enclosure, which can greatly improve the contact between the cement slurry and the rigid foam layer, so that the cement shell and the core material form a solid overall structure.

[0026] (3) The insulation board of the present invention meets the A1 grade non-combustible material standard (GB 8624-2012). When used as an interior wall insulation board, it has good fire safety. The heat transfer coefficient is about 0.15-0.40W / (m 2 K), meeting the requirements of general energy-saving buildings; the overall density is about 300-500kg / m 3 The compressive strength is about 8-16MPa, far exceeding the standard requirements (GB / T 29906-2013) and can meet the load-bearing requirements of the roof. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of the thermal insulation board of the present invention.

[0028] Figure 2 It is a two-box structure that makes up the rigid foam wrapping layer.

[0029] Figure 3 Schematic diagram of the insulation board preparation process.

[0030] Figure 4 This is a schematic structural diagram of the thermal insulation board with ceramic fiber nails according to the present invention.

[0031] Figure 5 It is a schematic structural diagram of the thermal insulation board with basalt fiber mesh cloth of the present invention. DETAILED DESCRIPTION

[0032] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below through specific implementation methods in conjunction with the accompanying drawings.

[0033] Example 1

[0034] like Figure 1As shown, this embodiment provides an interior wall insulation board, which includes a cement shell 10 and a core material 20. The core material 20 is composed of an aerogel filling area 21, an airbag wrapping body 22, a rigid foam wrapping layer 23 and an alkaline mesh cloth 24 from the inside to the outside. The alkaline mesh cloth 23 is bonded with resin and coated on the outside of the rigid foam wrapping layer 23. The alkaline mesh cloth 24 is used to improve the bonding strength between the cement shell 10 and the core material 20. The aerogel filled in the aerogel filling area 21 is a hydrophobic aluminum silicate aerogel particle with 5% nano aluminum hydroxide added. The thermal conductivity of the hydrophobic aluminum silicate aerogel is ≤0.025W / (m·K), and it is a non-combustible material. Aluminum hydroxide serves as a flame retardant synergist. The particle size of the hydrophobic aluminum silicate aerogel particles is 1-50μm. The thickness of the aerogel filling area 21 is preferably 7-10mm, and the length is less than the overall length of the insulation board.

[0035] The airbag enclosure 22 is a bag structure made by filling a plastic airbag with gas. The side wall of the bag is a double-layer plastic film bag filled with gas, which is similar to the structure of a shock-absorbing packaging bag used on the outside of electronic equipment. The material of the airbag enclosure is one of polyimide (PI) film, PC film (polycarbonate film), PET film (polyethylene terephthalate film), PMMA film (polymethyl methacrylate film), PP film (polypropylene film) and PS film (polystyrene film); preferably, it is a polyimide (PI) film. The limiting oxygen index of polyimide (PI) film is ≥36%, it is heat-resistant to 400°C, and it is not easy to burn. The airbag can be filled with non-oxidizing gases such as nitrogen or carbon dioxide, which can have a flame retardant effect. The thickness of the airbag enclosure 22 is preferably 6-8mm.

[0036] The rigid foam wrapping layer 23 is graphite-modified EPS or phenolic foam. Graphite-modified EPS is flame-retardant with an oxygen index ≥30%; phenolic foam is a B1 fireproof material with an oxygen index ≥36%, and burning drips self-extinguish in ≤5s. The rigid foam wrapping layer 23 is a hollow box structure. During its production process, two half boxes can be used to sandwich the airbag wrapping body 22 for assembly and splicing, or a box with a cover can be used to sandwich the airbag wrapping body 22 for assembly. The thickness of the rigid foam wrapping layer 23 is 6-8mm. The outer wall of the airbag wrapping body 22 is in tight contact with the inner wall of the rigid foam wrapping layer 23.

[0037] Alkaline mesh 24 is impregnated with a phosphate-modified resin adhesive. The phosphate-modified resin adhesive is made from phenolic resin with 10% by weight of ammonium polyphosphate added. This phosphate-modified resin adhesive forms an intumescent flame-retardant coating. When exposed to fire, it expands and seals the pores of rigid foam wrap 23, isolating it from oxygen and achieving a flame-retardant effect.

[0038] The cement shell 10 is made of 10-15% ultra-fine silica fume, 1-5% cellulose fiber and 15-20% hollow glass microspheres (microsphere density 0.15-0.25g / cm 3 The outer shell 10 is cast using magnesium phosphate cement slurry. Ultrafine silica fume increases density to prevent flame penetration, while hollow glass microspheres reduce the specific gravity of the cement shell. The silica fume and cellulose fibers combine to reduce the risk of cracking in the cement shell 10 and improve its compressive strength. The fire resistance of the cement shell 10 is >2 hours. Furthermore, magnesium phosphate cement has a lower specific gravity than silicate cement, approximately 85% of that of silicate cement, which helps reduce the specific gravity of the insulation board. The thickness of the cement shell 10 is preferably 8-10 mm.

[0039] The preparation process of the insulation board of this embodiment is as follows:

[0040] (1) The airbag is filled with nitrogen to form a bag, and the bag is filled with dry aerogel particles. The bag is sealed to obtain an airbag enclosure 22 filled with aerogel particles.

[0041] (2) The two half boxes 231 (such as Figure 2 As shown in the figure, the airbag wrapping body 22 is encapsulated inside so that the airbag wrapping body 22 fills the internal space of the two half boxes 231. The joints of the two half boxes 231 are sealed with waterproof glue. The two half boxes 231 form a hard foam wrapping layer 23.

[0042] (3) After applying phenolic resin glue on the inner side of the alkaline mesh cloth, it is tightly wrapped on the outside of the hard foam wrapping layer 23 and dried to obtain the core material 20.

[0043] (4) Figure 3 As shown, a thin layer of cement slurry is first poured into the insulation board mold 50, and then the core material 20 is placed in the mold 50, so that a certain width of spacing (8-10mm) is maintained between the core material 20 and the inner wall of the mold 50, and the cement slurry is continued to be poured until the mold is filled and the upper surface of the core material 20 is covered to a predetermined thickness (8-10mm). During the pouring process, vibration is performed to exhaust. After the pouring is completed, solidification and maintenance are carried out to obtain the insulation board of this embodiment.

[0044] Example 2

[0045] This embodiment further provides ceramic fiber nails 30 on the basis of Example 1 to replace metal connectors to facilitate the installation of the insulation board. The ceramic fiber nails 30 can avoid forming heat conduction bridges. The ceramic fiber nails 30 are made of Al2O3-SiO2-based ceramic and are formed by 3D gel injection molding. The upper end is a nail body with a spiral pattern (the lower end has several protrusions 31) to enhance the bonding strength with the cement shell and the assembly strength of the insulation board. The ceramic fiber nails 30 are integrally embedded in the cement shell 10 at both ends of the insulation board shown in Example 1, and the upper end of the ceramic fiber nails 30 protrudes from the insulation board, and the surface of the lower end is dispersed with several protrusions 31 to increase the consolidation force between the ceramic fiber nails 30 and the cement shell 10. Preferably, the diameter of the ceramic fiber nails 30 is 4-5 mm, and the total number of the ceramic fiber nails 30 is 4-8, with 2-4 nails set at each end.

[0046] The preparation process of the insulation board of this embodiment is similar to that of embodiment 1, and step (4) is adjusted to the following method: first, a thin layer of cement slurry is poured into the insulation board mold 50, and then the core material 20 is placed into the mold 50, so that a certain width of spacing (8-10 mm) is maintained between the core material 20 and the inner wall of the mold 50, and ceramic fiber nails 30 are pre-embedded at both ends of the insulation board mold 50 so that they stand vertically within the spacing between the core material 20 and the mold 50. The length of the ceramic fiber nail 30 is greater than the depth of the mold 50, and a plurality of protrusions 31 are dispersed on the surface of its lower end. The cement slurry is continuously poured until the mold 50 is filled and the upper surface of the core material 20 is covered to a predetermined thickness (8-10 mm). During the pouring process, the core material 20 is vibrated and exhausted. After the pouring is completed, the core material 20 is cured and maintained to obtain the insulation board with connectors of this embodiment.

[0047] Example 3

[0048] This embodiment builds upon Example 2 by further incorporating basalt fiber mesh 40. Basalt fiber mesh 40 is placed within the cement shell 10 on the upper and lower surfaces of the insulation board shown in Example 1 or Example 2, respectively. Basalt fiber mesh 40 has a thickness of 0.8-1 mm. Preferably, when ceramic fiber nails 30 are provided in the insulation board, basalt fiber mesh 40 is threaded onto the upper and lower ends of the nails 30. Basalt fiber mesh 40 enhances the overall compressive and crack resistance of the insulation board, achieving a compressive strength of approximately 14 MPa, sufficient for roof-bearing applications.

[0049] The preparation process of the insulation board of this embodiment is similar to that of embodiment 1, and step (4) is adjusted to the following method: a piece of basalt fiber mesh cloth 40 is first inserted into the lower end of the ceramic fiber nail 30, and the basalt fiber mesh cloth 40 is supported on the cap end of the bottom of the ceramic fiber nail 30 so that there is a gap between it and the bottom of the mold 50. First, a layer of cement slurry is poured to cover the basalt fiber mesh cloth 40, and then the core material 20 is placed in the mold 50 and a certain distance (8-10mm) is maintained between the core material 20 and the mold 50. The cement slurry is continued to be poured until it reaches the upper surface of the core material 20. Then, a second piece of basalt fiber mesh cloth 40 is inserted into the upper end of the ceramic fiber nail 30 so that the second piece of basalt fiber mesh cloth 40 is close to the upper surface of the core material 20. The cement slurry is continued to be poured until the mold 50 is filled and covered with the second piece of basalt fiber mesh cloth 40; vibration exhaust is performed during the pouring process, and after the pouring is completed, it is cured and maintained to obtain the strength-enhanced insulation board of this embodiment.

[0050] Application Example 1

[0051] The insulation board was made according to the structure of Example 1. The thickness of the aerogel filling area 21 was 8 mm. The aerogel was hydrophobic aluminum silicate aerogel particles with a particle size of 10-50 μm and 5% nano-aluminum hydroxide added. The airbag enclosure 22 was a nitrogen-filled airbag made of PI material with a thickness of 7 mm. The rigid foam wrapping layer 23 was graphite-modified EPS with a thickness of 7 mm. The cement shell 10 was a composite material with 10% ultrafine silica fume, 2% cellulose fiber and 15% hollow glass microspheres (microsphere density 0.15-0.25 g / cm 3 ) is cast with magnesium phosphate cement slurry and has a thickness of 10mm.

[0052] The preparation method of half box 231 of the rigid foam wrapping layer of graphite modified EPS is as follows:

[0053] (1) Prepare expandable polystyrene (containing a foaming agent such as pentane) beads with a particle size of 0.2-2 mm, expanded graphite (particle size 5-50 μm, carbon content ≥ 98%), a coupling agent (such as silane KH-550), and a flame retardant synergist (such as ammonium polyphosphate).

[0054] (2) Graphite coating to improve compatibility with EPS.

[0055] (3) EPS beads were premixed with graphite (8 wt%) and additives in a high-speed mixer (speed 1000 rpm, 15 minutes); melt blended through a twin-screw extruder (temperature 190 ° C, screw speed 60 rpm), extruded into pellets; cooled and pelletized to obtain graphite-modified EPS masterbatch.

[0056] (4) The masterbatch is pre-foamed with steam (100°C) and then injected into the mold for secondary foaming (pressure 0.2 MPa).

[0057] Application Example 2

[0058] The insulation board is made according to the structure of Example 2. The thickness of the aerogel filling area 21 is 8mm. The aerogel is a hydrophobic aluminum silicate aerogel particle with a particle size of 10-50μm and 5% nano-aluminum hydroxide added. The airbag enclosure 22 is a PI material nitrogen-filled airbag with a thickness of 7mm. The hard foam wrapping layer 23 is graphite-modified EPS with a thickness of 7mm. The cement shell 10 is a material with 10% ultrafine silica fume, 2% cellulose fiber and 15% hollow glass microspheres (microsphere density 0.15-0.25g / cm 3 The insulation board is cast with magnesium phosphate cement slurry and has a thickness of 10 mm. The insulation board is 40 cm long and wide, and has four ceramic fiber nails 30 at the four corners. The ceramic fiber nails 30 are made of 30% Al2O3-70% SiO2-based ceramic and have a diameter of 5 mm.

[0059] Application Example 3

[0060] The insulation board was made according to the structure of Example 3. The thickness of the aerogel filling area 21 was 8 mm. The aerogel was hydrophobic aluminum silicate aerogel particles with a particle size of 10-50 μm and 5% nano-aluminum hydroxide added. The airbag enclosure 22 was a nitrogen-filled airbag made of PI material with a thickness of 7 mm. The rigid foam wrapping layer 23 was graphite-modified EPS with a thickness of 7 mm. The cement shell 10 was a composite material with 10% ultrafine silica fume, 2% cellulose fiber and 15% hollow glass microspheres (microsphere density 0.15-0.25 g / cm 3 ) magnesium phosphate cement slurry, with a thickness of 10 mm. The insulation board is 40 cm long and wide, with four ceramic fiber nails 30 installed at the four corners. These are made of a 30% Al2O3-70% SiO2-based ceramic material and have a diameter of 5 mm. A 1 mm thick basalt fiber mesh 40 with a 1 cm x 1 cm opening is embedded in the upper and lower surfaces of the cement shell 10.

[0061] The fire rating, compressive strength, heat transfer coefficient, and overall density of the above three insulation boards are as follows:

[0062] Performance indicators Example 1 Example 2 Example 3 Fire rating A-level A-level A-level Compressive strength 8.1MPa 11.8MPa 14.4MPa Heat transfer coefficient 0.15 / (m2·K) 0.20 / (m2·K) 0.19 / (m2·K) Overall density 400kg / m3 417kg / m3 422kg / m3

[0063] The above thermal conductivity and compressive strength are tested according to GB / T 10294 and GB / T 5486.

[0064] Among them, the insulation board of Example 1 is suitable for insulation of non-load-bearing walls and curtain walls, and the insulation boards of Examples 2-3 are suitable for load-bearing parts such as roofs and floors, especially Example 3 can meet high pressure resistance requirements.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements, or when the technical features in the above embodiments do not conflict with each other, can be combined in the manner described in the embodiments, and these modifications, replacements or combinations do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An interior wall insulation board, characterized in that: It includes: The core material comprises an aerogel filling area, an airbag enclosure, a rigid foam enclosure, and an alkaline mesh cloth from the inside out; the airbag enclosure is made by filling a plastic airbag with gas; the alkaline mesh cloth is bonded with resin and coated on the outside of the rigid foam enclosure, and is used to improve the bonding strength between the cement shell and the core material.

2. The high-strength thermal insulation board according to claim 1, characterized in that: The aerogel in the aerogel filling area is hydrophobic aluminum silicate aerogel particles added with 5% nano aluminum hydroxide.

3. The high-strength thermal insulation board according to claim 1, characterized in that: The material of the airbag wrapping is PI film.

4. The high-strength thermal insulation board according to claim 1, characterized in that: The rigid foam wrapping layer is graphite-modified EPS or phenolic foam; the flexible mesh cloth is an alkaline mesh cloth impregnated with phosphate-modified resin glue; the phosphate-modified resin glue is made of phenolic resin + 10wt% ammonium polyphosphate.

5. The high-strength thermal insulation board according to claim 1, characterized in that: The cement shell is made by casting magnesium phosphate cement slurry added with 10-15% superfine silica fume, 1-5% cellulose fiber and 25-30% hollow glass microspheres.

6. The high-strength thermal insulation board according to claim 1, characterized in that: Ceramic fiber nails are embedded in the cement shell.

7. The high-strength thermal insulation board according to claim 1, characterized in that: Basalt fiber mesh cloth is embedded in the cement shell.

8. A method for preparing the high-strength thermal insulation board according to any one of claims 1 to 7, characterized in that: The steps include: S1. Filling the airbag with gas to form a bag, placing dry aerogel particles in the bag, and sealing the bag to obtain an aerogel-filled airbag enclosure; S2. Encapsulate the airbag enclosure within the two half boxes that form the rigid foam wrapping layer, apply waterproof glue to the joints of the two half boxes to seal them, and the two half boxes form the rigid foam wrapping layer; S3, after applying phenolic resin glue on the inner side of the alkaline mesh cloth, wrapping it on the outside of the rigid foam wrapping layer, and drying it to obtain a core material; S4. First, pour a layer of cement slurry in the mold, and then place the core material into the mold. There is a gap between the core material and the inner wall of the mold. Continue pouring cement slurry until the mold is filled and the upper surface of the core material is covered to a predetermined thickness. During the pouring process, vibrate and exhaust. After the pouring is completed, solidify and maintain.

9. The preparation method according to claim 8, characterized in that Step S4 also includes: pre-embedding ceramic fiber nails on both sides of the mold so that they are located within the distance between the core material and the mold; the length of the ceramic fiber nails is greater than the depth of the mold, and a plurality of protrusions are dispersed on the surface of the lower end thereof, and the cement slurry is continuously poured until the mold is filled and the upper surface of the core material is covered to a predetermined thickness. During the pouring process, the slurry is vibrated and exhausted. After the pouring is completed, the slurry is cured.

10. The preparation method according to claim 9, characterized in that S4 also includes: the lower end of the ceramic fiber nail is connected to the first basalt fiber mesh cloth, and the first basalt fiber mesh cloth is supported on the bottom cap end of the ceramic fiber nail so that there is a gap between the first basalt fiber mesh cloth and the bottom of the mold; first, a layer of cement slurry is poured to cover the first basalt fiber mesh cloth, and then the core material is placed in the mold so that there is a gap between the core material and the inner wall of the mold, and the cement slurry is continued to be poured until it reaches the upper surface of the core material, and then the second basalt fiber mesh cloth is connected to the upper end of the ceramic fiber nail so that the second basalt fiber mesh cloth is close to the upper surface of the core material, and the cement slurry is continued to be poured until the mold is filled and covered with the second basalt fiber mesh cloth; vibration exhaust is performed during the pouring process, and after the pouring is completed, solidification and curing are performed.

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