A heat and sound insulation board based on phosphogypsum and slag and a preparation method thereof

Abstract

The application discloses a kind of based on phosphogypsum and slag heat-insulating soundproof board and its preparation method, comprising: inner core layer, the middle part of the inner core layer is equidistantly opened along its width direction Multiple groups of triangular filling cavities, and the end of triangular filling cavity penetrates the side wall of inner core layer, and multiple groups of the triangular filling cavity are filled with filling material;Outer layer, wrapped in the outer side wall of inner core layer, the upper and lower surfaces of the outer layer are provided with sound-absorbing groove body;Wherein, the filling material is modified aerogel particle.The main raw material of the present application uses phosphogypsum and slag, the water absorption, stability and the strength of the prepared board of phosphogypsum are improved by wood powder, the supporting effect can be played by slag powder and mica powder, the strength is improved, and the prepared board strength stability is further strengthened by combining nano calcium carbonate, waterproof agent, polycarboxylic acid water reducing agent and flame retardant are also used, to improve the overall waterproof and flame retardant performance of the prepared board.

Description

Technical Field

[0001] This invention relates to the field of phosphogypsum treatment technology, specifically to a thermal insulation and soundproofing board based on phosphogypsum and slag, and its preparation method. Background Technology

[0002] Phosphogypsum is an industrial byproduct, and a large amount of it is produced annually in my country's industrial production. Due to limited recycling and its significant environmental pollution, the disposal of this waste phosphogypsum is a major challenge. Furthermore, construction projects often generate large amounts of waste soil, including discarded concrete, bricks, and gravel. Currently, the main methods of disposal are landfilling and stockpiling, without effective utilization. While phosphogypsum and waste soil can be used to prepare boards, the water content in phosphogypsum makes it difficult to achieve a dense mixture, resulting in poor compressive strength and inadequate thermal and sound insulation properties. This limits the application range of the prepared boards and fails to maximize resource utilization. Therefore, we propose a thermal and sound insulation board based on phosphogypsum and waste soil, along with its preparation method. Summary of the Invention

[0003] The purpose of this invention is to provide a thermal insulation and soundproofing board based on phosphogypsum and slag soil, and its preparation method, so as to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] A thermal and sound insulation board based on phosphogypsum and slag, comprising:

[0006] The inner core layer has multiple sets of triangular filling cavities equidistantly formed in the middle of its width direction, and the ends of the triangular filling cavities penetrate through the sidewall of the inner core layer. Each set of triangular filling cavities is filled with filler material.

[0007] The outer layer is wrapped around the outer wall of the inner core layer, and sound-absorbing grooves are formed on both the upper and lower surfaces of the outer layer.

[0008] The filler is a modified aerogel particle.

[0009] A further improvement is that the raw materials for preparing the inner core layer and the outer layer each include, by weight, the following: 47-58 parts of phosphogypsum powder, 27-35 parts of slag powder, 10-12 parts of wood powder, 6-10 parts of nano-calcium carbonate, 7-10 parts of mica powder, 1-2 parts of waterproofing agent, 1-2 parts of polycarboxylate superplasticizer, and 1-2 parts of flame retardant.

[0010] A further improvement is that the raw materials for preparing the modified aerogel particles include, by weight, the following: 40-58 parts aerogel particles, 10-22 parts lotus leaf powder, 20-32 parts mica powder, 20-25 parts ethanol solution, and 10-15 parts pore-forming agent.

[0011] A further improvement is that the preparation steps of the modified aerogel particles are as follows: lotus leaf powder and ethanol solution are placed in a reaction vessel and heated at 60-80℃ for 10-20 minutes, and then ultrasonically dispersed at 130-160W for 10-20 minutes to obtain a waterproof material; the aerogel particles and pore-forming agent are placed in a mixer and mixed evenly, and then mica powder and waterproof material are poured into the mixer for a second mixing, and after even mixing, the modified aerogel particles are obtained.

[0012] A method for preparing a thermal insulation and soundproofing board includes the following steps:

[0013] S1: Phosphogypsum powder, slag powder, wood powder, nano calcium carbonate, mica powder, waterproofing agent, polycarboxylate superplasticizer and flame retardant are mixed in a mixer to obtain mortar material. The mortar material is divided into two parts, namely inner core mortar material and outer mortar material.

[0014] S2: Inject the inner core layer mortar into the preparation mold device using grouting equipment. After the inner core layer mortar solidifies and forms the inner core layer in the preparation mold device, filler is then added to the triangular filling cavity of the inner core layer. Subsequently, the outer layer mortar is injected into the preparation mold device. After the outer layer mortar solidifies and forms the outer layer in the preparation mold device, it is removed to obtain a semi-finished thermal insulation and sound insulation board.

[0015] S3: The semi-finished thermal insulation and sound insulation board is steam cured, dried and cooled to obtain the finished thermal insulation and sound insulation board.

[0016] A further improvement is that the mold-making device in step S includes a molding mold, a molding opening penetrating the molding mold vertically, two sets of convertible template assemblies symmetrically arranged vertically within the molding opening, and two sets of side templates located within the molding opening and on either side between the two sets of convertible template assemblies. The two sets of side templates are respectively connected to the output ends of telescopic devices located on both sides of the molding mold. The outer walls of the two sets of convertible template assemblies on opposite sides and the outer walls of the two sets of side templates on opposite sides cooperate to form a molding cavity adapted to the inner core layer. The upper convertible template... The component is equipped with a feed guide cylinder that communicates with the molding cavity. Hollow seats are movably inserted into the inner walls of both sides of the molding mold. The outer end of the hollow seat is connected to the output end of the telescopic device embedded in the side wall of the molding mold. The inner end of the hollow seat passes through the side template and extends into the molding cavity. The outer end of the hollow seat is connected to the output end of the device that inputs filler material from the outside through a connecting pipe. The inner end of the hollow seat is equipped with multiple sets of triangular filling cavity forming seats for forming triangular filling cavities. One end of the triangular filling cavity forming seat communicates with the inner cavity of the hollow seat, and the other end is hollow.

[0017] The side template is T-shaped. Both the side template and the molding die have openings for the triangular filling cavity forming seat and the hollow seat to pass through. The inner wall of the molding opening has an movable opening for the outer end of the side template to enter.

[0018] A further improvement is that the convertible template assembly includes a second side template located within the forming opening, the outer side of the second side template being flush with the outer side of the forming mold, a third side template being connected to the outer side of the second side template via a connecting frame, the third side template being located within a connecting frame, the connecting frame being connected to the connecting frame via a rotating device and a rotating shaft, and the side template being provided with uniformly distributed sound-absorbing groove forming columns adapted to the sound-absorbing groove on the side away from the connecting frame, the connecting frame being driven to move relative to the forming mold by a telescopic device.

[0019] A further improvement is that the side template 1, side template 2, and side template 3 have the same thickness, the length of side template 2 is adapted to the length of the forming opening, the length of side template 3 is greater than the length of side template 2, and compensation blocks are provided at both ends of the side template 3 away from the connecting frame, and the thickness of the compensation blocks is adapted to the thickness of side template 1.

[0020] When the third side template is attached to the surface of the forming mold, the end of the compensation block away from the third side template engages with the end of the first side template that has been moved to a preset position.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows: The main raw materials of the present invention are phosphogypsum and slag. Wood flour is used to improve the water absorption, stability and strength of the prepared board. Slag powder and mica powder can play a supporting role and improve strength. At the same time, combined with nano calcium carbonate, the strength and stability of the prepared board are further enhanced. Waterproofing agent, polycarboxylate superplasticizer and flame retardant are also used to improve the overall waterproof and flame retardant performance of the prepared board. In addition, the outer layer of the present invention wraps the inner core layer and the triangular filling cavity is opened inside to improve the overall compressive strength of the prepared board. At the same time, the interior is filled with modified aerogel particles. On the one hand, the modified aerogel particles give the board high sound insulation and heat insulation performance. On the other hand, they can effectively absorb and buffer the pressure on the board during use, further improving the compressive performance of the board. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the thermal insulation and soundproofing board structure of the present invention;

[0023] Figure 2 This is a side view of the inner core layer structure of the present invention;

[0024] Figure 3 This is a schematic diagram of the mold-making device of the present invention;

[0025] Figure 4 This is a schematic diagram of the triangular filling cavity forming seat structure of the present invention. In the figure: 1. Inner core layer; 2. Triangular filling cavity; 3. Filler material; 4. Outer layer; 5. Silencing groove; 6. Molding mold; 7. Telescopic device; 8. Molding opening; 9. Side template one; 10. Telescopic device one; 11. Movable opening; 12. Hollow seat; 13. Triangular filling cavity forming seat; 14. Telescopic device two; 15. Side template two; 16. Feed guide cylinder; 17. Molding cavity; 18. Side template three; 19. Silencing groove forming column; 20. Compensation block; 21. Connecting frame; 22. Rotating device. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] Example 1

[0028] Please see the appendix Figure 1 - Appendix Figure 2A thermal insulation and sound insulation board based on phosphogypsum and slag soil includes: an inner core layer 1, a plurality of triangular filling cavities 2 are equidistantly opened in the middle of the inner core layer 1 along its width direction, and the ends of the triangular filling cavities 2 penetrate through the side wall of the inner core layer 1, and the plurality of triangular filling cavities 2 are filled with filler material 3.

[0029] Furthermore, the triangular filling cavity 2 makes the thermal insulation and soundproofing board more stable and provides higher impact resistance. By filling the triangular filling cavity 2 with filler material 3, the thermal insulation, sound insulation, and impact resistance of the board are improved. In practice, multiple sets of triangular filling cavities 2 can be used as shown in the attached figure. Figure 2 The configuration is shown in the diagram, that is, the triangle filling cavity 2 with its tip pointing upwards is positioned between the two triangle filling cavities 2 with its tip pointing downwards;

[0030] The outer layer 4 is wrapped around the outer wall of the inner core layer 1. The upper and lower surfaces of the outer layer 4 are provided with sound-absorbing grooves 5 to further improve the sound insulation performance of the board.

[0031] Among them, filler 3 is modified aerogel particles.

[0032] As a preferred embodiment, the raw materials for preparing the inner core layer 1 and the outer layer 4 in this embodiment include, by weight, 47 parts of phosphogypsum powder, 27 parts of slag powder, 10 parts of wood powder, 6 parts of nano-calcium carbonate, 7 parts of mica powder, 1 part of waterproofing agent, 1 part of polycarboxylate superplasticizer, and 1 part of flame retardant.

[0033] The aforementioned phosphogypsum powder is obtained by crushing ordinary phosphogypsum with a crushing device and then screening it, with a sieve aperture diameter of less than or equal to 5 mm; the slag powder is obtained by crushing construction site slag with a crushing device and then screening it, with a sieve aperture diameter of less than or equal to 5 mm; the wood powder has a mesh size of 80 mesh, for example, wood-plastic composite wood powder; the nano calcium carbonate has a mesh size of 3000 mesh; the mica powder has a mesh size of 800 mesh; the waterproofing agent is, for example, a board waterproofing agent; the flame retardant is, for example, aluminum hydroxide.

[0034] Preferably, the raw materials for preparing the modified aerogel particles in this embodiment include, by weight, 40 parts aerogel particles, 10 parts lotus leaf powder, 20 parts mica powder, 20 parts ethanol solution, and 10 parts pore-forming agent.

[0035] The aerogel particles mentioned above are 20 mesh; the mica powder is 800 mesh; the ethanol solution has a mass concentration of 30%; and the pore-forming agent is ethyl acetate.

[0036] As a preferred embodiment, the preparation steps of the modified aerogel particles are as follows: lotus leaf powder and ethanol solution are placed in a reaction vessel and heated at 60°C for 10 minutes, and then ultrasonically dispersed at 130W for 10 minutes to obtain a waterproof material; the aerogel particles and pore-forming agent are placed in a mixer for mixing, and after being mixed evenly, mica powder and waterproof material are poured into the mixer for secondary mixing, and after being mixed evenly, the modified aerogel particles are obtained.

[0037] A method for preparing a thermal insulation and soundproofing board based on phosphogypsum and slag soil, specifically including the following steps:

[0038] S1: Phosphogypsum powder, slag powder, wood powder, nano calcium carbonate, mica powder, waterproofing agent, polycarboxylate superplasticizer and flame retardant are mixed in a mixer to obtain mortar material. The mortar material is divided into two parts, namely inner core layer 1 mortar material and outer layer 4 mortar material.

[0039] S2: Inject the inner core mortar into the preparation mold device using a grouting device. After the inner core mortar solidifies and forms the inner core 1 in the preparation mold device, filler 3 is then filled into the triangular filling cavity 2 of the inner core 1. Subsequently, the outer mortar is injected into the preparation mold device. After the outer mortar solidifies and forms the outer layer 4 in the preparation mold device, it is removed to obtain a semi-finished thermal insulation and sound insulation board.

[0040] S3: The semi-finished thermal insulation and sound insulation board is steam cured, dried and cooled to obtain the finished thermal insulation and sound insulation board.

[0041] Please see the appendix Figure 3-4 As shown in the attached figure, in a preferred embodiment, the mold preparation device in step S2 includes a molding mold 6, a molding opening 8 penetrating the molding mold 6 vertically, two sets of convertible template assemblies symmetrically arranged vertically within the molding opening 8, and two sets of side templates 9 arranged within the molding opening 8 and respectively located on both sides between the two sets of convertible template assemblies. The two sets of side templates 9 are respectively connected to the output ends of telescopic devices 10 arranged on both sides of the molding mold 6. The outer walls of the two sets of convertible template assemblies on opposite sides and the outer walls of the two sets of side templates 9 on opposite sides cooperate to form a molding cavity 17 adapted to the inner core layer 1. In the initial state, i.e., attached Figure 3 In the state of being formed, the inner core layer mortar is injected into the molding cavity 17, so that the inner core layer mortar is formed in the molding cavity 17 to obtain the inner core layer 1.

[0042] The upper convertible template assembly is equipped with a feed guide cylinder 16 that communicates with the forming cavity 17, from which the feed guide cylinder 16 is attached. Figure 3 It can be seen that the feed guide cylinder 16 runs vertically through the upper conversion template assembly;

[0043] Hollow seats 12 are movably inserted into the inner walls of both sides of the molding mold 6. The outer end of the hollow seat 12 is connected to the output end of the telescopic device 2 14 embedded in the side wall of the molding mold 6. The inner end of the hollow seat 12 passes through the side template 1 9 and extends into the molding cavity 17. The outer end of the hollow seat 12 is connected to the output end of the device that inputs the filler material 3 through the connecting pipe. The inner end of the hollow seat 12 is provided with multiple sets of triangular filling cavity forming seats 13 for forming triangular filling cavities 2. One end of the triangular filling cavity forming seat 13 is connected to the inner cavity of the hollow seat 12, and the other end is hollow. Under the action of the triangular filling cavity forming seat 13, the inner core layer 1 formed has multiple triangular filling cavities 2. The filler material 3 is input into the hollow seat 12 through the connecting pipe through the external device (e.g., pump body), and then enters the triangular filling cavity forming seat 13. Subsequently, it enters the triangular filling cavity 2 from one end of the triangular filling cavity forming seat 13. It should be noted that when filling the filler material 3, the telescopic device 2 14 controls the hollow seat 12 to drive the triangular filling cavity forming seat 13 to move outward.

[0044] The side template 9 is T-shaped. Both the side template 9 and the molding die 6 have openings for the triangular filling cavity forming seat 13 and the hollow seat 12 to pass through. The inner wall of the molding opening 8 has an movable opening 11 for the outer end of the side template 9 to enter. The movable opening 11 is connected to the opening, so that the side template 9 can move and adjust its position within the molding opening 8 for subsequent preparation of the outer layer 4.

[0045] Preferably, the convertible template assembly of this embodiment includes a second side template 15 located inside the forming opening 8. The outer side of the second side template 15 is flush with the outer side of the forming mold 6. The outer side of the second side template 15 is connected to a third side template 18 via a connecting frame. The third side template 18 is located inside the connecting frame 21. The connecting frame is connected to the connecting frame 21 via a rotating device 22 and a rotating shaft. That is, the rotating device 22 drives the connecting frame to rotate so that the second side template 15 or the third side template 18 corresponds to the end of the forming mold 6.

[0046] The side template 3 18 is provided with uniformly arranged sound-absorbing groove forming columns 19 on the side away from the connecting frame, so as to form the sound-absorbing groove 5. The connecting frame 21 is driven by the telescopic device 7 to move relative to the forming mold 6.

[0047] Preferably, in this embodiment, the side template 1 9, side template 2 15 and side template 3 18 have the same thickness. The length of side template 2 15 is adapted to the length of the forming opening 8, and the length of side template 3 18 is greater than the length of side template 2 15, so that side template 2 15 can enter the forming opening 8, while side template 3 18 cannot enter the forming opening 8, thereby making the outer layer 4 wrap around the outer side of the inner core layer 1.

[0048] Both ends of the side template 3 18 away from the connecting frame are provided with compensation blocks 20, and the thickness of the compensation blocks 20 is adapted to the thickness of the side template 1 9.

[0049] When the side template 3 18 is attached to the surface of the molding mold 6, the end of the compensation block 20 away from the side template 3 18 engages with the end of the side template 1 9 that has been moved to the preset position. The side template 1 9 that has been moved to the preset position is attached to the inner wall of the molding opening 8. After the inner core layer 1 is formed, the telescopic device 10 drives the side template 1 9 to move and attach to the inner wall of the molding opening 8. Then, the telescopic device 7 drives the connecting frame 21 to move to the designated position. The rotating device 22 drives the connecting frame to rotate so that the side template 3 18 corresponds to the molding opening 8. Then, the telescopic device 7 drives the side template 3 18 to attach to the molding mold 6. Finally, the outer layer 4 mortar is injected from the feed guide cylinder 16 to prepare the outer layer 4.

[0050] It should be noted that the forming mold 6 and the telescopic device 7 in the mold preparation device are both connected to the external frame, which will not be described in detail here.

[0051] The specific steps of preparing the mold using the mold preparation device in step S2 of this application are as follows:

[0052] S1: The inner layer mortar is injected into the molding cavity 17 from the feed guide cylinder 16 through the grouting equipment. The inner layer mortar is formed into an inner core layer 1 with a triangular filling cavity 2 in the molding cavity 17 in conjunction with the triangular filling cavity forming seat 13.

[0053] S2: Modified aerogel particles are fed into the hollow seat 12 through a connecting pipe via an external device, and then into the triangular filling cavity forming seat 13. The hollow seat 12 is controlled by the telescopic device 2 14 to move the triangular filling cavity forming seat 13 outward. The modified aerogel particles are filled into the triangular filling cavity 2 from one end of the triangular filling cavity forming seat 13. After filling, the telescopic device 2 14 is closed when the triangular filling cavity forming seat 13 is at the outer end of the triangular filling cavity 2 (due to the support of the triangular filling cavity forming seat 13, the inner core layer 1 after molding will not face downward).

[0054] S3: Adjust the molding cavity 17, drive the side template 9 to move and fit against the inner wall of the molding opening 8 through the telescopic device 10, drive the connecting frame 21 to move to the preset position through the telescopic device 7, and then drive the connecting frame to rotate through the rotating device 22 so that the side template 18 corresponds to the molding opening 8. Then drive the connecting frame 21 to move through the telescopic device 7 until the side template 18 contacts the outer wall of the molding mold 6 (at this time, the compensation block 20 is engaged with the end of the side template 9 to ensure the flatness of the side wall of the outer layer 4). Then inject the mortar material of the outer layer 4 from the feed guide cylinder 16 through the grouting device.

[0055] S4: After injecting an appropriate amount of mortar, the hollow seat 12 is driven by the telescopic device 2 14 to move the triangular filling cavity forming seat 13 until the inner end of the triangular filling cavity forming seat 13 is parallel to the inner side wall of the side template 1 9. Then, the outer layer mortar is injected from the feed guide cylinder 16 until the outer layer mortar fills the adjusted forming cavity 17. The outer layer mortar solidifies and forms an outer layer 4 with a sound-absorbing groove 5 on the outside of the inner core layer 1 in conjunction with the sound-absorbing groove forming column 19, thus obtaining a semi-finished thermal insulation and soundproof board.

[0056] Comparative Example 1

[0057] The difference from Example 1 is that the inner core layer 1 is a solid structure, and there are no triangular filling cavities or filling materials inside it;

[0058] Comparative Example 2

[0059] The difference from Example 1 is that the triangular filling cavity of the inner core layer 1 is not filled with filler 3;

[0060] Comparative Example 3

[0061] The difference from Example 1 is that the filler 3 in the triangular filling cavity of the inner core layer 1 is aerogel particles.

[0062] Comparative Example 4

[0063] The difference from Example 1 is that the raw materials for preparing the filler 3 in the triangular filling cavity of the inner core layer 1 do not include lotus leaf powder and mica powder.

[0064] Performance testing:

[0065] Thermal insulation and sound insulation boards were prepared according to the methods of Example 1 and Comparative Examples 1-4 described above;

[0066] 1. Sound insulation performance test: Select a closed space and open an opening at the connection between the closed space and the outdoor space to accommodate the thermal insulation and sound insulation board. Seal and install the thermal insulation and sound insulation boards prepared in Example 1 and Comparative Examples 1-4 into the opening in sequence. Test the sound decibel values ​​in the closed space and the outdoor space after different thermal insulation and sound insulation boards are installed using a sound decibel meter. Use the decibel difference between the closed space and the outdoor space to judge the sound insulation performance of the thermal insulation and sound insulation boards in Example 1 and Comparative Examples 1-4.

[0067] 2. Thermal insulation performance test: Select a sealed space and open an opening at the connection between the sealed space and the outdoor space to accommodate the thermal insulation and sound insulation panels. Seal and install the thermal insulation and sound insulation panels prepared in Example 1 and Comparative Examples 1-4 into the opening in sequence. Use a temperature detector to test the temperature values ​​in the sealed space and the outdoor space after the installation of different thermal insulation and sound insulation panels. Use the temperature difference between the sealed space and the outdoor space to judge the thermal insulation performance of the thermal insulation and sound insulation panels of Example 1 and Comparative Examples 1-4 (tested in winter environment).

[0068] 3. The compressive strength of the thermal insulation and sound insulation boards prepared according to the methods in Example 1 and Comparative Examples 1-4 was tested using a fatigue testing machine. The experimental results are as follows: ;

[0069] Conclusion: Based on the experimental results, the thermal insulation and soundproofing board prepared in Example 1 exhibits high sound insulation, thermal insulation, and compressive strength performance. Comparative Examples 1 and 2 show that the triangular filling cavity and the filling material play a crucial role in the sound insulation, thermal insulation, and compressive strength performance of the thermal insulation and soundproofing board. Comparative Example 3 shows that using modified aerogel particles significantly improves the sound insulation, thermal insulation, and compressive strength of the prepared thermal insulation and soundproofing board compared to ordinary aerogel particles. Comparative Example 4 shows that the lotus leaf powder and mica powder in the modified aerogel particles enhance the sound insulation, thermal insulation, and compressive strength performance of the thermal insulation and soundproofing board. Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for preparing a thermal insulation and soundproofing board based on phosphogypsum and slag, characterized in that, The thermal insulation and soundproofing board includes: an inner core layer (1), in which multiple sets of triangular filling cavities (2) are equidistantly opened in the middle of the inner core layer (1) along its width direction, and the ends of the triangular filling cavities (2) penetrate through the side wall of the inner core layer (1), and each set of triangular filling cavities (2) is filled with filler material (3); an outer layer (4), which is wrapped around the outer side wall of the inner core layer (1), and sound-absorbing grooves (5) are opened on the upper and lower surfaces of the outer layer (4); wherein, the filler material (3) is modified aerogel particles; The preparation method specifically includes the following steps: S1: Phosphogypsum powder, slag powder, wood powder, nano calcium carbonate, mica powder, waterproofing agent, polycarboxylate superplasticizer and flame retardant are mixed in a mixer to obtain mortar material. The mortar material is divided into two parts, namely inner core mortar material and outer mortar material. S2: Inject the inner core mortar into the preparation mold device through the grouting equipment. After the inner core mortar solidifies into the inner core (1) in the preparation mold device, filler (3) is then filled into the triangular filling cavity (2) of the inner core (1). Then, inject the outer mortar into the preparation mold device. After the outer mortar solidifies into the outer layer (4) in the preparation mold device, it is taken out to obtain the semi-finished thermal insulation and sound insulation board. S3: The semi-finished thermal insulation and sound insulation board is steam-cured, dried and cooled to obtain the finished thermal insulation and sound insulation board. The mold-making device in step S2 includes a molding mold (6), a molding opening (8) penetrating the molding mold (6) vertically, two sets of convertible template assemblies symmetrically arranged in the molding opening (8), and two sets of side templates (9) arranged in the molding opening (8) on both sides between the two sets of convertible template assemblies. The two sets of side templates (9) are respectively connected to the output ends of telescopic devices (10) arranged on both sides of the molding mold (6). The outer walls of the two sets of convertible template assemblies on opposite sides and the outer walls of the two sets of side templates (9) on opposite sides cooperate to form a molding cavity (17) adapted to the inner core layer (1). The upper convertible template assembly is provided with a connection to the molding cavity (17). The feeding guide cylinder (16) has hollow seats (12) movably inserted into the inner walls of both sides of the forming mold (6). The outer end of the hollow seat (12) is connected to the output end of the telescopic device (14) embedded in the side wall of the forming mold (6). The inner end of the hollow seat (12) passes through the side template (9) and extends into the forming cavity (17). The outer end of the hollow seat (12) is connected to the output end of the device that inputs the filling material (3) from the outside through a connecting pipe. The inner end of the hollow seat (12) is provided with multiple sets of triangular filling cavity forming seats (13) for forming triangular filling cavities (2). One end of the triangular filling cavity forming seat (13) is connected to the inner cavity of the hollow seat (12), and the other end is hollow. The side template (9) is T-shaped. Both the side template (9) and the molding die (6) have openings for the triangular filling cavity forming seat (13) and the hollow seat (12) to pass through. The inner wall of the molding opening (8) has an movable opening (11) for the outer end of the side template (9) to enter.

2. The preparation method according to claim 1, characterized in that: The raw materials for preparing the inner core layer (1) and the outer layer (4) include, by weight, 47-58 parts of phosphogypsum powder, 27-35 parts of slag powder, 10-12 parts of wood powder, 6-10 parts of nano-calcium carbonate, 7-10 parts of mica powder, 1-2 parts of waterproofing agent, 1-2 parts of polycarboxylate superplasticizer, and 1-2 parts of flame retardant.

3. The preparation method according to claim 1, characterized in that: The raw materials for preparing the modified aerogel particles include, by weight, 40-58 parts aerogel particles, 10-22 parts lotus leaf powder, 20-32 parts mica powder, 20-25 parts ethanol solution, and 10-15 parts pore-forming agent.

4. The preparation method according to claim 3, characterized in that: The preparation steps of the modified aerogel particles are as follows: lotus leaf powder and ethanol solution are placed in a reaction vessel and heated at 60-80℃ for 10-20 min, and then ultrasonically dispersed at 130-160W for 10-20 min to obtain a waterproof material; the aerogel particles and pore-forming agent are placed in a mixer and mixed evenly, and then mica powder and waterproof material are poured into the mixer for a second mixing, and the modified aerogel particles are obtained after even mixing.

5. The preparation method according to claim 1, characterized in that: The convertible template assembly includes a second side template (15) located inside the forming opening (8). The outer side of the second side template (15) is flush with the outer side of the forming mold (6). The outer side of the second side template (15) is connected to a third side template (18) via a connecting frame. The third side template (18) is located inside a connecting frame (21). The connecting frame is connected to the connecting frame (21) via a rotating device (22) and a rotating shaft. The side of the third side template (18) away from the connecting frame is uniformly provided with sound-absorbing groove forming columns (19) adapted to the sound-absorbing groove (5). The connecting frame (21) is driven by a telescopic device (7) to move relative to the forming mold (6).

6. The preparation method according to claim 5, characterized in that: The side template 1 (9), side template 2 (15) and side template 3 (18) have the same thickness. The length of side template 2 (15) is adapted to the length of the forming opening (8). The length of side template 3 (18) is greater than the length of side template 2 (15). Both ends of side template 3 (18) away from the connecting frame are provided with compensation blocks (20). The thickness of the compensation blocks (20) is adapted to the thickness of side template 1 (9). When the side template three (18) is attached to the surface of the molding die (6), the end of the compensation block (20) away from the side template three (18) is engaged with the end of the side template one (9) that has been moved to the preset position.

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