A mesoporous ceramic / chlorinated polypropylene carbonate sound-insulating foam core material and its preparation method

Abstract

This invention relates to the technical field of noise-reducing core materials, specifically to a mesoporous ceramic / chlorinated polypropylene carbonate sound-insulating foam core material and its preparation method, made from the following raw materials in parts by weight: 3-20 parts mesoporous ceramic, 75.6-92.6 parts chlorinated polypropylene carbonate, 4 parts azodicarbonamide, and 0.4 parts zinc oxide. The mesoporous ceramic / chlorinated polypropylene carbonate foam material of this invention has advantages such as low density, high strength, excellent sound insulation performance, and environmental friendliness. Its transmission loss at the mid-frequency (1000-2000Hz) can reach 34-60dB, its compressive modulus can reach 10.6-26.8MPa, and its compressive strength can reach 0.24-0.45MPa. It can be used as a sound-insulating foam core material to fill building walls and has good application prospects in the field of earthquake resistance and sound insulation in the construction industry.

Description

Technical Field

[0001] This invention relates to the technical field of noise-reducing core materials, specifically to a mesoporous ceramic / chlorinated polypropylene carbonate sound-insulating foam core material and its preparation method. Background Technology

[0002] With the development of modern society, noise pollution has become increasingly serious, adversely affecting people's quality of life and health. The demand for noise control and acoustic environment optimization is growing in fields such as construction, transportation, industrial production, and home appliances. To effectively reduce noise and improve indoor and outdoor acoustic environments, the development of materials with excellent sound insulation properties has become a research hotspot. Sound-insulating foam core materials, due to their lightweight, porous, and customizable characteristics, show broad application prospects in sound absorption and insulation. Research shows that by adjusting the pore size, density, thickness, and other physical parameters of the foam material, its sound insulation effect can be significantly improved. At the same time, modern industry has increasingly higher comprehensive requirements for material performance, demanding not only excellent acoustic properties but also good mechanical strength, weather resistance, and environmental friendliness from sound-insulating foam core materials. Therefore, the research and development of high-performance sound-insulating foam core materials has become an important topic in the field of acoustic materials, not only meeting diverse market demands but also providing a new technological path for achieving sustainable development.

[0003] Currently, a significant portion of lightweight partition walls both domestically and internationally exhibit poor sound insulation performance. The sound insulation of a single-layer wall fails to meet the minimum sound insulation requirements for residential unit partitions, limiting its application to interior walls. Traditional foam core material production methods primarily rely on chemical foaming agents, which can pose threats to the environment and human health at high temperatures. As soundproofing wall materials, there are five main categories: concrete walls, block walls, panel walls, thin-panel composite walls, and sprayed cement mortar surface walls. These walls mostly improve their sound insulation performance by increasing wall thickness and using solid materials. Soundproofing foam core material is a type of micro-closed bubble filled with gas, characterized by its lightweight, impact resistance, vibration damping, and sound insulation properties. Chinese patent CN202122574634.6 discloses a method for preparing sound-insulating and noise-reducing polystyrene foam boards, which requires splicing and assembly, uses a large amount of sound-insulating and fire-retardant fillers, and involves a complex process. Chinese patent CN202320026257.9 discloses a high-efficiency thermal insulation foam board with sound insulation effect. However, the selected material, polystyrene, is non-degradable, and the issue of waste recycling needs to be considered. The mesoporous ceramics used in this paper have high bactericidal properties, chlorinated polypropylene carbonate is biodegradable, and azodicarbonamide is food-grade, thus meeting the requirements of green and pollution-free materials. The mesoporous ceramic / chlorinated polypropylene carbonate sound-insulating foam core material of this invention has a compressive modulus of 5.6-26.8 MPa and a compressive strength of 0.11-0.45 MPa. Its transmission loss at the mid-frequency (1000-2000 Hz) is 34-60 dB, making it an excellent foam core material for new lightweight soundproof walls with promising application prospects in the field of earthquake resistance and sound insulation in the construction industry. Summary of the Invention

[0004] One of the objectives of this invention is to provide a mesoporous ceramic / chlorinated polypropylene carbonate sound-insulating foam core material. Through the synergistic effect of the nanoporous structure of the mesoporous ceramic and the microporous structure of the foam, the mesoporous ceramic / chlorinated polypropylene carbonate sound-insulating foam has a good noise reduction effect. The mesoporous ceramic / chlorinated polypropylene carbonate foam material of this invention has the advantages of low density, high strength, excellent sound insulation performance, and environmental friendliness.

[0005] The second objective of this invention is to provide a mesoporous ceramic / chlorinated polypropylene carbonate sound-insulating foam core material and its preparation method, which is simple and easy to adjust.

[0006] One of the solutions adopted to achieve the objective of this invention is: a mesoporous ceramic / chlorinated polypropylene carbonate sound insulation foam core material, made from the following raw materials in parts by weight: 3-20 parts mesoporous ceramic, 75.6-92.6 parts chlorinated polypropylene carbonate (CPPC), 4 parts azodicarbonamide (ADC), and 0.4 parts zinc oxide.

[0007] Preferably, the mesoporous ceramic is prepared by mixing red stone, sodium alkaline bentonite, zinc stone, bituminous stone with starch, silver citrate, and ferrous citrate aqueous solution, drying under air-isolated conditions, calcining at 700-1000℃ for 4-6 hours, and then cooling and grinding.

[0008] The mesoporous ceramic prepared by this invention has hook-shaped crystalline iron nanoparticles and silver nanoparticles on its surface, which increases the contact area with the CPPC matrix.

[0009] Preferably, the chlorinated polypropylene carbonate is prepared by modifying polypropylene carbonate through an aqueous suspension chlorination reaction.

[0010] The second objective of this invention is achieved through a method for preparing the mesoporous ceramic / chlorinated polypropylene carbonate sound-insulating foam core material, wherein the mesoporous ceramic / chlorinated polypropylene carbonate sound-insulating foam core material is prepared by melt blending and physically binding foaming of mesoporous ceramic, chlorinated polypropylene carbonate, azodicarbonamide, and zinc oxide.

[0011] Preferably, it includes the following steps:

[0012] (1) According to the required mass fractions of each raw material, mix them evenly in a mixer to obtain mixed raw materials;

[0013] (2) Pour the mixed raw materials from step (1) into a torque rheometer for melt blending to obtain CPPC-based composite material;

[0014] (3) The CPPC-based composite material after melt blending in step (2) is hot-pressed to prepare CPPC-based composite material sheets;

[0015] (4) The CPPC-based composite material sheet is placed in a polytetrafluoroethylene mold and physically bound and foamed by controlling the foaming temperature, foaming time and mold size to obtain mesoporous ceramic / CPPC foam material.

[0016] Preferably, in step (1), the rotation speed is 1000-2000 r / min and the time is 20-40 s during premixing.

[0017] Preferably, in step (2), during melt blending, the rotation speed is 40-60 r / min, the temperature is 120-140℃, and the time is 12 min.

[0018] Preferably, in step (3), the thickness of the CPPC-based composite sheet is 2-5 mm, and the hot pressing conditions are: hot pressing temperature 120-140℃, pressure 10-15 MPa, and holding time 5-8 min.

[0019] Preferably, in step (4), the foaming conditions for the mesoporous ceramic / chlorinated polycarbonate foam material are: foaming temperature 165-200℃ and foaming time 10-30min.

[0020] The mesoporous ceramic used in this invention has hook-shaped crystalline iron and silver nanoparticles on its surface, which increases the contact area with the CPPC matrix. At the same time, the decomposition products of the foaming agent ADC have highly polar amide bonds (-CO-NH-), which easily form hydrogen bonds with the hydroxyl groups (-OH) in the mesoporous ceramic, making the mesoporous ceramic in the mesoporous ceramic / CPPC foam material tightly bonded to the CPPC matrix. The mesoporous ceramic can act as a heterogeneous nucleating agent, promoting cell nucleation during the foaming process, reducing the cell size, increasing the propagation path of sound waves in the foam material, and also acting as a reinforcing phase to improve the mechanical properties of the foam material.

[0021] The present invention has the following advantages and beneficial effects:

[0022] The mesoporous ceramic / CPPC sound-insulating foam core material of this invention comprises a micron-level closed-cell and nano-level open-cell foam structure, mesoporous ceramic, and a CPPC matrix. The foam structure promotes multiple reflections, refractions, and collisions of incident sound waves within the foam pores, dissipating sound energy. The mesoporous ceramic is tightly bonded to the CPPC matrix, allowing a small portion of the sound waves entering the matrix to be further reflected and collided within the nanoporous ceramic, further dissipating sound energy. Through the synergistic effect of the nanoporous structure of the mesoporous ceramic and the micron-level pore structure of the foam pores, the mesoporous ceramic / chlorinated polypropylene carbonate sound-insulating foam exhibits excellent noise reduction performance.

[0023] The mesoporous ceramic / chlorinated polypropylene carbonate foam material of this invention has advantages such as low density, high strength, excellent sound insulation performance, and environmental friendliness. Its transmission loss in the mid-frequency range of 1000-2000Hz can reach 34-60dB, its compression modulus can reach 10.6-26.8MPa, and its compressive strength can reach 0.24-0.45MPa. It can be used as a sound insulation foam core material to fill building walls and has a good application prospect in the field of earthquake resistance and sound insulation of building walls. Attached Figure Description

[0024] Figure 1 This is a diagram illustrating the sound wave transmission mechanism of the mesoporous ceramic / chlorinated polypropylene carbonate sound insulation foam of the present invention.

[0025] Figure 2 This is a microscopic morphology diagram of the mesoporous ceramic of the present invention;

[0026] Figure 3 This is a microscopic morphology diagram of the mesoporous ceramic / chlorinated polypropylene carbonate sound insulation foam of the present invention. Detailed Implementation

[0027] To better understand the present invention, the following embodiments are further illustrations of the present invention, but the content of the present invention is not limited to the following embodiments.

[0028] In this invention, chlorinated polypropylene carbonate was provided by the Changchun Institute of Applied Chemistry, Chinese Academy of Sciences; mesoporous ceramics were provided by Wuhan Maifeite Technology Co., Ltd.; azodicarbonamide was purchased from Henan Shuangcheng Food Co., Ltd.; and zinc oxide was purchased from Shanghai Maclean Biochemical Technology Co., Ltd.

[0029] Figure 1 This is a diagram illustrating the sound wave transmission mechanism of the mesoporous ceramic / chlorinated polypropylene carbonate sound insulation foam of the present invention.

[0030] The mesoporous ceramic of this invention is prepared by mixing red ochre, sodium alkaline bentonite, zinc ochre, bituminous ochre, and an aqueous solution of starch, silver citrate, and ferrous citrate, drying the mixture under a nitrogen atmosphere at 120°C, calcining it at 800°C for 4 hours, and then cooling and grinding it. Figure 2 The image shows the microstructure of the mesoporous ceramic of the present invention. As can be seen from the image, the pore size of the mesoporous ceramic is in the range of 20-50 nm, and 5-10 nm "hook-like" crystals are distributed on the surface and in the pore channels. These crystals are composed of zero-valent iron nanoparticles and silver nanoparticles, which increases the contact area with the matrix. The addition of mesoporous ceramic as a dopant phase improves the acoustic and mechanical properties of the mesoporous ceramic / chlorinated polypropylene carbonate foam.

[0031] Example 1

[0032] Chlorinated polypropylene carbonate was dried in a 50℃ oven for 2 hours. Then, 15 parts of mesoporous ceramics, 80.6 parts of chlorinated polypropylene carbonate, 4 parts of azodicarbonamide, and 0.4 parts of zinc oxide were weighed and mixed evenly in a mixer at 2000 r / min for 40 seconds. The mixture was then poured into a torque rheometer and melt-blended at 140℃ and 60 r / min for 12 minutes to obtain a CPPC-based composite material. The CPPC-based composite material was then further melt-blended at 140℃. ℃ A CPPC-based composite material sheet was hot-pressed to a thickness of 2 mm under a pressure of 15 MPa and a holding time of 5 min. The sheet was then placed in a Φ29 mm × 5 mm polytetrafluoroethylene mold and foamed at 190 °C for 20 min. Finally, it was cooled and shaped at room temperature to obtain a mesoporous ceramic / CPPC foam material. The obtained mesoporous ceramic / CPPC foam material had a compressive modulus of 17.2 MPa, a compressive strength of 0.33 MPa, an average pore size of 552 μm, and a transmission loss of 36-45 dB in the 1000-2000 Hz range. Its microstructure is shown in the figure below. Figure 3 As shown in (d), the pore structure is an elliptical closed pore with a relatively regular shape, moderate pore diameter, and thick pore wall, which improves the sound insulation performance and mechanical properties to a certain extent.

[0033] Example 2

[0034] Chlorinated polypropylene carbonate was dried in a 50℃ oven for 2 hours. Six parts of mesoporous ceramics, 89.6 parts of chlorinated polypropylene carbonate, 4 parts of azodicarbonamide, and 0.4 parts of zinc oxide were weighed and mixed evenly in a mixer at 1500 r / min for 30 seconds. The mixture was then poured into a torque rheometer and melt-blended at 130℃ and 50 r / min for 12 minutes to obtain a CPPC-based composite material. The CPPC-based composite material was then further melt-blended at 130℃. ℃ A CPPC-based composite material sheet was hot-pressed to a thickness of 3 mm under a pressure of 12 MPa and a holding time of 5 min. The sheet was then placed in a Φ29 mm × 6 mm polytetrafluoroethylene mold and foamed at 180 °C for 20 min. Finally, it was cooled and shaped at room temperature to obtain a mesoporous ceramic / CPPC foam material. The obtained mesoporous ceramic / CPPC foam material had a compressive modulus of 15.9 MPa, a compressive strength of 0.28 MPa, an average pore size of 575 μm, and a transmission loss of 38-48 dB in the 1000-2000 Hz range. Its microstructure is shown in the figure below. Figure 3 As shown in (e), the pore structure is an elliptical closed pore with a moderate pore diameter and a relatively regular shape, which improves the sound insulation performance and mechanical properties to a certain extent.

[0035] Example 3

[0036] Chlorinated polypropylene carbonate was dried in a 50℃ oven for 2 hours. Then, 20 parts of mesoporous ceramics, 75.6 parts of chlorinated polypropylene carbonate, 4 parts of azodicarbonamide, and 0.4 parts of zinc oxide were weighed and mixed evenly in a mixer at 2000 r / min for 40 seconds. The mixture was then poured into a torque rheometer and melt-blended at 140℃ and 60 r / min for 12 minutes to obtain a CPPC-based composite material. The CPPC-based composite material was then further melt-blended at 140℃. ℃ A CPPC-based composite material sheet was hot-pressed to a thickness of 3 mm under a pressure of 15 MPa and a holding time of 5 min. The sheet was then placed in a Φ29 mm × 7 mm polytetrafluoroethylene mold and foamed at 200 °C for 20 min. Finally, it was cooled and shaped at room temperature to obtain a mesoporous ceramic / CPPC foam material. The obtained mesoporous ceramic / CPPC foam material had a compressive modulus of 26.8 MPa, a compressive strength of 0.45 MPa, an average pore size of 531 μm, and a transmission loss of 39-46 dB in the 1000-2000 Hz range. Its microstructure is shown in the figure below. Figure 3 As shown in (f), the pore structure is an elliptical closed pore with a moderate diameter and a relatively regular shape. It has a small number of small pores, which improves the sound insulation performance and significantly enhances the mechanical properties.

[0037] Example 4

[0038] Chlorinated polypropylene carbonate was dried in a 50℃ oven for 2 hours. Then, 12 parts of mesoporous ceramics, 83.6 parts of chlorinated polypropylene carbonate, 4 parts of azodicarbonamide, and 0.4 parts of zinc oxide were weighed and mixed evenly in a mixer at 2000 r / min for 40 seconds. The mixture was then poured into a torque rheometer and melt-blended at 140℃ and 60 r / min for 12 minutes to obtain a CPPC-based composite material. The CPPC-based composite material was then further melt-blended at 140℃. ℃ A CPPC-based composite material sheet was hot-pressed to a thickness of 4 mm under a pressure of 15 MPa and a holding time of 5 min. The sheet was then placed in a Φ29 mm × 9 mm polytetrafluoroethylene mold and foamed at 190 °C for 20 min. Finally, it was cooled and shaped at room temperature to obtain a mesoporous ceramic / CPPC foam material. The obtained mesoporous ceramic / CPPC foam material had a compressive modulus of 15.2 MPa, a compressive strength of 0.38 MPa, an average pore size of 588 μm, and a transmission loss of 36-47 dB in the 1000-2000 Hz range. Its microstructure is shown in the figure below. Figure 3 As shown in (g), the pore structure is a circular closed pore with relatively thin pore walls in some areas, which improves the sound insulation performance and significantly enhances the mechanical properties.

[0039] Example 5

[0040] Chlorinated polypropylene carbonate was dried in a 50℃ oven for 2 hours. Three parts of mesoporous ceramic, 92.6 parts of chlorinated polypropylene carbonate, 4 parts of azodicarbonamide, and 0.4 parts of zinc oxide were weighed and mixed evenly in a mixer at 1000 r / min for 20 seconds. The mixture was then poured into a torque rheometer and melt-blended at 120℃ and 40 r / min for 12 minutes to obtain a CPPC-based composite material. The CPPC-based composite material was then further melt-blended at 120℃. ℃ A CPPC-based composite material sheet was hot-pressed to a thickness of 5 mm under a pressure of 10 MPa and a holding time of 5 min. The sheet was then placed in a Φ29 mm × 10 mm polytetrafluoroethylene mold and foamed at 170 °C for 20 min. Finally, it was cooled and shaped at room temperature to obtain a mesoporous ceramic / CPPC foam material. The obtained mesoporous ceramic / CPPC foam material had a compressive modulus of 10.6 MPa, a compressive strength of 0.29 MPa, an average pore size of 671 μm, and a transmission loss of 49-60 dB in the 1000-2000 Hz range. Its microstructure is shown in the figure below. Figure 3 As shown in (h), the pore structure is a circular closed pore with relatively thin pore walls in some areas, which greatly improves the sound insulation performance and also improves the mechanical properties to a certain extent.

[0041] Example 6

[0042] Chlorinated polypropylene carbonate was dried in a 50℃ oven for 2 hours. Nine parts of mesoporous ceramics, 86.6 parts of chlorinated polypropylene carbonate, 4 parts of azodicarbonamide, and 0.4 parts of zinc oxide were weighed and mixed evenly in a mixer at 1500 r / min for 30 seconds. The mixture was then poured into a torque rheometer and melt-blended at 130℃ and 50 r / min for 12 minutes to obtain a CPPC-based composite material. The CPPC-based composite material was then further melt-blended at 130℃. ℃ A CPPC-based composite material sheet was hot-pressed to a thickness of 4 mm under a pressure of 12 MPa and a holding time of 5 min. The sheet was then placed in a Φ29 mm × 8 mm polytetrafluoroethylene mold and foamed at 180 °C for 20 min. Finally, it was cooled and shaped at room temperature to obtain a mesoporous ceramic / CPPC foam material. The obtained mesoporous ceramic / CPPC foam material had a compressive modulus of 12.8 MPa, a compressive strength of 0.24 MPa, an average pore size of 666 μm, and a transmission loss of 39-50 dB in the 1000-2000 Hz range. Its microstructure is shown in the figure below. Figure 3 As shown in (i), the pore structure is a circular closed pore with a relatively thin pore wall in some areas and an increased number of pores, which improves the sound insulation performance and mechanical properties to a certain extent.

[0043] Comparative Example 1

[0044] Chlorinated polypropylene carbonate was dried in a 50℃ oven for 2 hours. 95.6 parts of chlorinated polypropylene carbonate, 4 parts of azodicarbonamide, and 0.4 parts of zinc oxide were weighed and mixed evenly in a mixer at 1000 r / min for 20 seconds. The mixture was then poured into a torque rheometer and melt-blended at 120℃ and 40 r / min for 12 minutes to obtain a CPPC-based composite material. The CPPC-based composite material was then further processed at 120℃. ℃ A CPPC-based composite material sheet with a thickness of 3 mm was hot-pressed at a pressure of 10 MPa for 5 minutes. The sheet was then placed in a Φ29 mm × 7 mm polytetrafluoroethylene mold and foamed at 165 °C for 20 minutes. Finally, it was cooled and solidified at room temperature to obtain the CPPC foam material. The obtained CPPC foam material had a compressive modulus of 5.6 MPa, a compressive strength of 0.11 MPa, an average pore size of 804 μm, and a transmission loss of 34-40 dB in the 1000-2000 Hz range. Its microstructure is shown in the figure below. Figure 3 As shown in (a), the pore structure is an elliptical closed pore with a thicker pore wall and a larger pore diameter compared to the embodiment. The sound insulation performance and mechanical properties are both lower than those of the embodiment.

[0045] Comparative Example 2

[0046] Polyurethane foam with a compressive modulus of 0.07 MPa, a compressive strength of 0.004 MPa, an average pore size of 767 μm, and a transmission loss of 12-18 dB in the 1000-2000 Hz frequency range is shown in the microstructure diagram below. Figure 3 As shown in (b), the pore structure is a spherical open pore with high porosity, and the sound insulation and mechanical properties are far lower than those of the example.

[0047] Comparative Example 3

[0048] The ceramic / polyurethane foam has a compressive modulus of 0.11 MPa, a compressive strength of 0.01 MPa, an average pore size of 715 μm, and a transmission loss of 20-23 dB in the 1000-2000 Hz range. Its microstructure is shown in the image below. Figure 3 As shown in (c), the pore structure is a spherical open pore with high porosity. The sound insulation performance and mechanical properties are improved compared to Comparative Example 2, but the sound insulation performance and mechanical properties are far lower than those of the Example.

[0049] Table 1. Performance parameters of the sound-insulating foams prepared in Examples 1-6 and Comparative Examples 1-3.

[0050]

[0051]

[0052] As shown in Table 1, the mesoporous ceramic / chlorinated polypropylene foam material of this invention has a transmission loss of 34-60 dB at a mid-frequency range of 1000-2000 Hz, which is 32%-66% higher than that of chlorinated polypropylene foam material. Its compressive modulus is 10.6-26.8 MPa, which is 89%-378% higher than that of chlorinated polypropylene foam material. Its compressive strength is 0.24-0.45 MPa, which is 118%-309% higher than that of chlorinated polypropylene foam material.

[0053] The above description is merely a preferred embodiment of the present invention, and should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A mesoporous ceramic / chlorinated polypropylene carbonate sound-insulating foam core material, characterized in that, It is made from the following raw materials in parts by weight: 3-20 parts mesoporous ceramics, 75.6-92.6 parts chlorinated polypropylene carbonate, 4 parts azodicarbonamide, and 0.4 parts zinc oxide; The mesoporous ceramic is made by mixing red ochre, sodium alkaline bentonite, zinc oxide, bituminous rock, and an aqueous solution of starch, silver citrate, and ferrous citrate, drying it under air-free conditions, and then heating it at 700-1000 °C. o The product is obtained by calcining at C for 4-6 hours, followed by cooling and grinding.

2. The mesoporous ceramic / chlorinated polypropylene carbonate sound-insulating foam core material according to claim 1, characterized in that: The chlorinated polypropylene carbonate is prepared by modifying polypropylene carbonate through an aqueous suspension chlorination reaction.

3. A method for preparing a mesoporous ceramic / chlorinated polypropylene carbonate sound-insulating foam core material according to any one of claims 1-2, characterized in that: The mesoporous ceramic / chlorinated polypropylene carbonate sound insulation foam core material is made by melt blending and physically binding foaming of mesoporous ceramic, chlorinated polypropylene carbonate, azodicarbonamide, and zinc oxide.

4. The method for preparing the mesoporous ceramic / chlorinated polypropylene carbonate sound-insulating foam core material according to claim 3, characterized in that, Includes the following steps: (1) According to the required mass fractions of each raw material, mix them evenly in a mixer to obtain mixed raw materials; (2) Pour the mixed raw materials from step (1) into a torque rheometer for melt blending to obtain a chlorinated polycarbonate propylene ester-based composite material; (3) The chlorinated polypropylene carbonate-based composite material after melt blending in step (2) is hot-pressed to prepare chlorinated polypropylene carbonate-based composite material sheets; (4) Chlorinated polycarbonate propylene-based composite material sheets are placed in a polytetrafluoroethylene mold and physically bound and foamed by controlling the foaming temperature, foaming time and mold size to obtain mesoporous ceramic / chlorinated polycarbonate foam material.

5. The method for preparing the mesoporous ceramic / chlorinated polypropylene carbonate sound-insulating foam core material according to claim 4, characterized in that: In step (1), the rotation speed is 1000-2000 r / min and the time is 20-40 s during premixing.

6. The method for preparing the mesoporous ceramic / chlorinated polypropylene carbonate sound-insulating foam core material according to claim 4, characterized in that: In step (2), during melt blending, the rotation speed is 40-60 r / min, the temperature is 120-140℃, and the time is 12 min.

7. The method for preparing the mesoporous ceramic / chlorinated polypropylene carbonate sound-insulating foam core material according to claim 4, characterized in that: In step (3), the thickness of the chlorinated polycarbonate propylene-based composite sheet is 2-5 mm, and the hot pressing conditions are: hot pressing temperature 120-140℃, pressure 10-15 MPa, and holding time 5-8 min.

8. The method for preparing the mesoporous ceramic / chlorinated polypropylene carbonate sound-insulating foam core material according to claim 4, characterized in that: In step (4), the foaming conditions for the mesoporous ceramic / chlorinated polycarbonate foam material are: foaming temperature 165-200℃, foaming time 10-30 min.

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