Floor sound insulation and heat preservation system and preparation method thereof

Abstract

The invention provides a floor sound insulation and heat preservation system and a preparation method thereof, and relates to the technical field of floor sound insulation and heat preservation. The floor sound insulation and heat preservation system comprises a mortar layer, an autoclaved aerated concrete layer and a mortar layer which are sequentially arranged. The autoclaved aerated concrete layer comprises the following components in parts by weight: 40-50 parts of sand, 5-15 parts of quick lime, 25-45 parts of cement, 5-15 parts of gypsum, 0.3-1 part of aluminum powder, 5-12 parts of slaked lime, 3-9 parts of modified fibers, 1-5 parts of an additive and 50-100 parts of water; the modified fiber comprises a fiber matrix, an organic modified layer coated on the fiber matrix and an inorganic modified layer coated on the organic modified layer; the organic modified layer is water-based acrylate-polyurethane, and the inorganic modified layer is silicon dioxide aerogel and silicate. And by improving the biocompatibility of the fibers, the sound insulation and heat preservation properties of the aerated concrete are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of floor sound insulation and thermal insulation, and in particular to a floor sound insulation and thermal insulation system and a preparation method thereof. Background Art

[0002] With the booming development of green buildings, prefabricated buildings, with their advantages such as high efficiency and environmental friendliness, are gradually becoming an important development direction in the construction industry. However, prefabricated buildings also face some core issues that need to be addressed urgently, among which sound insulation and thermal insulation are particularly critical. As new building standards further increase the requirements for floor sound insulation performance, how to effectively reduce impact sound transmission has become an industry focus. Existing technologies generally use the method of laying an organic layer during the floor laying process to reduce impact sound transmission. Although organic materials have good elasticity and can provide sound insulation to a certain extent, they also have obvious disadvantages. Due to the inherent characteristics of organic materials, a hardening layer must be provided on them. This not only increases the complexity and cost of construction, but also poses certain risks to the bonding stability between multi-layer structures. Over time, problems such as interlayer separation may occur, affecting the durability of the sound insulation effect. Based on this, the development of a purely inorganic floor sound insulation system is imminent.

[0003] As a lightweight, porous inorganic material, aerated concrete (AAC) has both advantages and limitations in floor slab sound insulation. AAC is lightweight and efficient, reducing structural loads. Its evenly distributed, closed pores effectively absorb and disperse sound wave energy, providing excellent sound insulation for airborne mid- and high-frequency noise (such as conversation and electrical noise). It also offers thermal insulation, fire resistance (with a fire resistance limit of up to 3-4 hours), and impermeability, meeting the energy-saving and environmental protection requirements of green buildings. However, while AAC offers some insulation against airborne sound, it offers limited sound insulation for common impact sounds in floors (such as footsteps and furniture dragging). It also provides inadequate sound insulation for low-frequency impact sounds, resulting in poor sound insulation. This is primarily due to AAC's poor elasticity and low elastic modulus, which prevents it from effectively absorbing and dispersing vibrations. Furthermore, AAC's low compressive strength (ranging from 3.5 to 7.5 MPa) makes it unsuitable as a primary load-bearing structural material, potentially causing cracking in the floor slab and compromising sound insulation performance. Currently, fibers are often added to aerated concrete to improve crack resistance and strength, and to enhance sound insulation by utilizing the fiber's vibration to increase sound energy conversion efficiency. However, the compatibility of fibers with concrete is not high, and the synergistic effect of adding fibers is limited. Summary of the Invention

[0004] The object of the present invention is to provide a floor sound insulation and thermal insulation system, which can improve the biocompatibility of fibers and enhance the sound insulation and thermal insulation performance of aerated concrete.

[0005] Another object of the present invention is to provide a method for preparing a floor sound insulation and thermal insulation system, which is used to prepare the above-mentioned floor sound insulation and thermal insulation system.

[0006] The present invention is achieved through the following technical solutions:

[0007] A floor sound insulation and heat preservation system comprises a mortar layer, an autoclaved aerated concrete layer and a mortar layer arranged in sequence;

[0008] The autoclaved aerated concrete layer comprises, by weight, 40-50 parts of sand, 5-15 parts of quicklime, 25-45 parts of cement, 5-15 parts of gypsum, 0.3-1 parts of aluminum powder, 5-12 parts of slaked lime, 3-9 parts of modified fiber, 1-5 parts of admixture and 50-100 parts of water;

[0009] The modified fiber includes a fiber matrix, an organic modified layer coated on the fiber matrix, and an inorganic modified layer coated on the organic modified layer; the organic modified layer is water-based acrylate-polyurethane, and the inorganic modified layer is silicon dioxide aerogel and silicate.

[0010] In the present invention, the polar groups (such as carboxylic acid groups and hydroxyl groups) of the water-based acrylate-polyurethane can form hydrogen bonds or chemical bonds with the fiber surface, thereby increasing the bonding strength between the organic modified layer and the fiber matrix and improving the interfacial shear strength; the flexible organic modified layer can buffer external stress, reduce fiber brittle fracture, and inhibit crack expansion through the fiber bridging effect; the hydrophobicity of acrylate and the flexibility of polyurethane work synergistically to improve the aging resistance of the fiber in a hot and humid environment. The organic modified layer and the inorganic modified layer form a flexible-rigid composite structure to increase the fiber bending stiffness. At the same time, the inorganic modified layer can increase the compatibility of the modified fiber with the concrete material, promote mutual penetration, and improve the mechanical strength and durability of the aerated concrete. The organic modified layer is used to enhance the toughness of the fiber matrix, the inorganic modified layer is used to enhance the compatibility of the fiber matrix, and the water-based acrylate-polyurethane is used as the intermediate layer. The bonding strength of each layer can be significantly improved. The three-layer composite structure cooperates to make the modified fiber have better mechanical strength, elastic modulus and compatibility, thereby enhancing its synergistic effect on aerated concrete.

[0011] Silica aerogel can block thermal shock from high or low temperatures on fibers, delaying aging. Its hydrophobicity can also be used to reduce water penetration, preventing hygroscopic expansion or chemical corrosion of the fibers. The silicate layer can improve the fiber's high-temperature resistance. The nanopores of silica aerogel can absorb mid- and high-frequency sound waves. Combined with the viscoelastic damping properties of water-based acrylate-polyurethane, it achieves full-band noise attenuation and enhances sound insulation. Combining silica aerogel with water-based acrylate-polyurethane can improve the dispersibility of silica aerogel, addressing the problem of silica aerogel's easy agglomeration in concrete, and also increase the bonding strength between silica aerogel and the fiber matrix. Through filling, interfacial bonding, and surface coating, silica aerogel has achieved a transformation from a "brittle porous material" to a "strong and tough composite," improving the mechanics, durability, and hydrophobicity of concrete.

[0012] Modified fibers can form a network structure within aerated concrete, filling pores, strengthening the bond between aggregate and sand, and increasing the overall compressive strength of the aerated concrete. The modified fibers' flexible-rigid composite structure effectively disperses shrinkage stress within the aerated concrete and reduces drying shrinkage cracks. Furthermore, the organic modified layer absorbs impact energy, while the silicate layer provides enhanced rigid support, thereby improving the impact strength of the aerated concrete. The composite structure of water-based acrylate-polyurethane and the fiber matrix improves the elasticity and modulus of the aerated concrete, enhancing its impact sound insulation.

[0013] The modified fiber's three-layer composite structure significantly enhances the mechanical properties, weather resistance, and multifunctionality of the fiber matrix through material synergy and interface design. When applied to aerated concrete, it achieves comprehensive improvements in sound insulation, thermal insulation, and crack resistance while maintaining lightweight construction. This is particularly suitable for green building applications that demand high energy conservation, environmental protection, and durability.

[0014] Preferably, the mass content of the organic modified layer in the modified fiber is 12-20%, and the mass content of the inorganic modified layer in the modified fiber is 6-10%.

[0015] Preferably, the preparation method of the modified fiber is: placing the fiber matrix in an aqueous acrylate-polyurethane emulsion for modification, forming an organic modified layer on the surface of the fiber matrix, and obtaining an organic modified fiber; and depositing silica aerogel and silicate on the surface of the organic modified fiber to form an inorganic modified layer covering the organic modified fiber.

[0016] In the present invention, the water-based acrylate-polyurethane emulsion is prepared by adding a water-based polyurethane emulsion (solid content 30-40%) to an acrylate emulsion (solid content 40-50%) at a mass ratio of 4:1. The mixture is stirred at 200-300 rpm for 30-60 minutes. A defoamer (BYK-024) at a concentration of 0.1-0.3% of the total mass of the mixed emulsion and a wetting agent (TEGO Wet 270) at a concentration of 0.5-1% of the total mass of the mixed emulsion are then added. The pH of the mixed emulsion is adjusted to 7.5-8.5 with aqueous ammonia, and the mixture is allowed to stand for 12-24 hours. The water-based polyurethane and acrylate form a composite structure through hydrogen bonding or microphase separation.

[0017] In the present invention, the deposition process involves immersing the organically modified fiber in an inorganic modification solution for reaction. The inorganic modification solution has a silica aerogel concentration of 0.45-1 mol / L, a silicate concentration of 1.2-1.6 mol / L, and a pH of 10-12. The mass ratio of silica aerogel to silicate is 1-4:1.

[0018] Preferably, the fiber matrix comprises polypropylene fibers, polyester fibers and polyvinyl chloride fibers in a mass ratio of 2:1:1.

[0019] Preferably, the silicate includes one or more of sodium silicate, calcium silicate, magnesium silicate and potassium silicate.

[0020] Preferably, the system further comprises an elastic layer, the elastic layer being located below the bottom mortar layer or between the bottom mortar layer and the autoclaved aerated concrete layer, the elastic layer being made of rubber or foam and having a thickness of 1-2 mm. The elastic layer may also be made of other materials with elastic compression.

[0021] Preferably, the mortar layer comprises, by weight, 20-30 parts Portland cement, 40-50 parts sand, 5-15 parts rubber powder, 1-10 parts cellulose, 10-20 parts expanded perlite, 1-5 parts staple fibers, 1-10 parts polystyrene particles, and 70-100 parts water. The low thermal conductivity of polystyrene particles can effectively reduce heat transfer, significantly improving the building's energy efficiency. The porous structure of polystyrene particles can absorb and disperse sound wave energy, providing excellent sound insulation, particularly against medium and high-frequency noise. Combining polystyrene particles with staple fibers can improve the mortar's crack resistance and impact resistance, reducing shrinkage cracks.

[0022] Preferably, the thickness of the mortar layer is 5-10 mm, and the thickness of the autoclaved aerated concrete layer is 15-40 mm.

[0023] Preferably, the admixture is a polycarboxylate water reducer.

[0024] A method for preparing a floor sound insulation and thermal insulation system comprises the following steps:

[0025] Mortar and autoclaved aerated concrete precast panels are prepared according to the raw material formula; mortar is applied on the surface of the floor structure to form a base mortar layer, an elastic layer is laid on the surface of the mortar layer, the autoclaved aerated concrete precast panels are placed on the elastic layer to form an autoclaved aerated concrete layer, and finally mortar is continued to be applied on the surface of the autoclaved aerated concrete layer to form a surface mortar layer.

[0026] The technical solution of the present invention has at least the following advantages and beneficial effects:

[0027] 1. The polar groups (such as carboxylic acid and hydroxyl groups) of waterborne acrylate-polyurethane can form hydrogen bonds or chemical bonds with the fiber surface, improving the bond strength between the organic modified layer and the fiber matrix and enhancing interfacial shear strength. The flexible organic modified layer can buffer external stress, reduce fiber brittle fracture, and inhibit crack propagation through the fiber bridging effect. The hydrophobicity of acrylate and the flexibility of polyurethane work synergistically to improve the fiber's aging resistance in hot and humid environments. The organic modified layer and the inorganic modified layer form a flexible-rigid composite structure, increasing the fiber's flexural stiffness. At the same time, the inorganic modified layer can improve the compatibility of the modified fiber with concrete materials, promote mutual penetration, and enhance the mechanical strength and durability of aerated concrete. The organic modified layer enhances the toughness of the fiber matrix, the inorganic modified layer enhances its compatibility with the fiber matrix, and the waterborne acrylate-polyurethane serves as the intermediate layer, significantly improving the bonding strength of each layer. The synergistic three-layer composite structure gives the modified fiber excellent mechanical strength, elastic modulus, and compatibility, enhancing its synergistic effect on aerated concrete.

[0028] 2. Modified fibers can form a network structure within aerated concrete, filling pores, strengthening the bond between aggregate and sand, and increasing the overall compressive strength of the aerated concrete. The modified fibers' flexible-rigid composite structure effectively disperses shrinkage stress in the aerated concrete and reduces drying shrinkage cracks. Furthermore, the organic modified layer absorbs impact energy, while the silicate layer provides enhanced rigid support, thereby improving the impact strength of the aerated concrete. The composite structure of water-based acrylate-polyurethane and fiber matrix improves the elasticity and modulus of the aerated concrete, enhancing its impact sound insulation.

[0029] 3. This system utilizes the high density of the surface mortar layer to effectively block airborne sound, particularly mid- and high-frequency noise, while also improving the stability of the system structure and reducing vibration. The elastic layer and autoclaved aerated concrete layer, in combination, not only cut off fixed sound transmission paths, significantly reducing the transmission of low-frequency impact sound, but also absorb some sound wave energy, reducing sound wave reflections, and assisting in reducing the transmission of airborne and fixed sound. The underlying mortar layer strengthens the bond between the structure and the floor slab, securing and reinforcing the overall structure. This multi-layered structure forms an acoustic isolation system, blocking the sound bridge effect and comprehensively improving sound insulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 Schematic diagram of impact sound insulation of Example 1 and Comparative Example 1, wherein the dotted line represents Example 1 and the solid line represents Comparative Example 1;

[0031] Figure 2 Schematic diagram of impact sound insulation of Example 1 and Comparative Example 2, wherein the dotted line represents Example 1 and the solid line represents Comparative Example 2. DETAILED DESCRIPTION

[0032] The present invention will be further described below in conjunction with specific embodiments, but the examples do not limit the present invention in any form. Unless otherwise stated, the raw materials and reagents used in the examples of the present invention are conventionally purchased raw materials and reagents.

[0033] Example 1

[0034] A floor sound insulation and heat preservation system comprises a mortar layer, an elastic layer, an autoclaved aerated concrete layer and a mortar layer which are arranged in sequence;

[0035] The autoclaved aerated concrete layer includes, by weight, 45 parts of sand, 10 parts of quicklime, 30 parts of cement, 10 parts of gypsum, 0.5 parts of aluminum powder, 6 parts of slaked lime, 6 parts of modified fiber, 3 parts of admixture (polycarboxylate water reducer) and 80 parts of water; the raw materials are mixed, grouted, autoclaved and cured to obtain an aerated concrete prefabricated board.

[0036] The modified fiber includes a fiber matrix, an organic modified layer coated on the fiber matrix, and an inorganic modified layer coated on the organic modified layer; the organic modified layer is water-based acrylate-polyurethane, and the inorganic modified layer is silica aerogel and silicate; the mass content of the organic modified layer in the modified fiber is 15%, and the mass content of the inorganic modified layer in the modified fiber is 8%; the fiber matrix includes polypropylene fiber, polyester fiber and polyvinyl chloride fiber in a mass ratio of 2:1:1.

[0037] Preparation of a water-based acrylate-polyurethane emulsion: A water-based polyurethane emulsion (solid content 35%) was added to an acrylate emulsion (solid content 45%) at a mass ratio of 4:1. The mixture was stirred at 250 rpm for 50 min. A defoamer (BYK-024) was added at a concentration of 0.2% by weight of the total mass of the mixed emulsion, and a wetting agent (TEGO Wet 270) was added at a concentration of 0.8% by weight of the total mass of the mixed emulsion. The pH of the mixed emulsion was adjusted to 8 with aqueous ammonia and allowed to stand for 20 h.

[0038] The preparation method of the modified fiber is as follows: placing a fiber matrix in an aqueous acrylate-polyurethane emulsion for treatment for 30 hours to form an organic modification layer on the surface of the fiber matrix to obtain an organic modified fiber; immersing the organic modified fiber in an inorganic modification solution for reaction, wherein the mass ratio of silica aerogel to silicate in the inorganic modification solution is 3:1, the concentration of silica aerogel is 0.8 mol / L, the concentration of silicate is 1.4 mol / L, and the pH of the inorganic modification solution is 11, thereby forming an inorganic modification layer covering the organic modified fiber.

[0039] The mortar layer includes, by weight, 25 parts of Portland cement, 45 parts of sand, 10 parts of rubber powder, 5 parts of cellulose, 15 parts of expanded perlite, 3 parts of short fibers, 5 parts of polystyrene particles, and 90 parts of water. The raw materials are mixed to obtain mortar.

[0040] Preparation of floor sound insulation system:

[0041] Apply mortar on the surface of the floor structure to form a bottom mortar layer with a thickness of 8mm;

[0042] Then lay an elastic layer on the surface of the mortar layer, the thickness of the elastic layer is 1.5mm;

[0043] Placing the aerated concrete precast panels on the elastic layer to form an autoclaved aerated concrete layer, the thickness of the autoclaved aerated concrete layer being 30 mm;

[0044] Finally, continue to apply mortar on the surface of the autoclaved aerated concrete layer to form a surface mortar layer. The thickness of the surface mortar layer is 6 mm.

[0045] Example 2

[0046] A floor sound insulation and heat preservation system comprises an elastic layer, a mortar layer, an autoclaved aerated concrete layer and a mortar layer which are arranged in sequence;

[0047] The autoclaved aerated concrete layer includes, by weight, 40 parts of sand, 5 parts of quicklime, 25 parts of cement, 5 parts of gypsum, 0.3 parts of aluminum powder, 5 parts of slaked lime, 3 parts of modified fiber, 1 part of admixture (polycarboxylate water reducer) and 60 parts of water; the raw materials are mixed, grouted, autoclaved and cured to obtain an aerated concrete prefabricated board.

[0048] The modified fiber includes a fiber matrix, an organic modified layer coated on the fiber matrix, and an inorganic modified layer coated on the organic modified layer; the organic modified layer is water-based acrylate-polyurethane, and the inorganic modified layer is silica aerogel and silicate; the mass content of the organic modified layer in the modified fiber is 12%, and the mass content of the inorganic modified layer in the modified fiber is 6%; the fiber matrix includes polypropylene fiber, polyester fiber and polyvinyl chloride fiber in a mass ratio of 2:1:1.

[0049] Preparation of a water-based acrylate-polyurethane emulsion: A water-based polyurethane emulsion (solid content 30%) was added to an acrylate emulsion (solid content 40%) at a mass ratio of 4:1. The mixture was stirred at 200 rpm for 30 minutes. A defoamer (BYK-024) at a concentration of 0.1% by weight of the total emulsion and a wetting agent (TEGO Wet 270) at a concentration of 0.5% by weight of the total emulsion were added. The pH of the emulsion was adjusted to 7.5 with aqueous ammonia and the mixture was allowed to stand for 12 hours.

[0050] The preparation method of the modified fiber is as follows: placing a fiber matrix in an aqueous acrylate-polyurethane emulsion for treatment for 12 hours to form an organic modification layer on the surface of the fiber matrix to obtain an organic modified fiber; immersing the organic modified fiber in an inorganic modification solution for reaction, wherein the mass ratio of silica aerogel to silicate in the inorganic modification solution is 1:1, the concentration of silica aerogel is 0.45 mol / L, the concentration of silicate is 1.2 mol / L, and the pH of the inorganic modification solution is 10, thereby forming an inorganic modification layer covering the organic modified fiber.

[0051] The mortar layer includes, by weight, 20 parts of Portland cement, 40 parts of sand, 5 parts of rubber powder, 1 part of cellulose, 10 parts of expanded perlite, 1 part of short fiber, 1 part of polystyrene particles, and 70 parts of water. The raw materials are mixed to obtain mortar.

[0052] Preparation of floor sound insulation system:

[0053] Lay foam on the surface of the floor structure to form an elastic layer with a thickness of 1mm;

[0054] Then apply mortar on the surface of the elastic layer to form a bottom mortar layer, the thickness of the bottom mortar layer is 5mm;

[0055] Placing the aerated concrete precast panels on the mortar to form an autoclaved aerated concrete layer with a thickness of 15 mm;

[0056] Finally, continue to apply mortar on the surface of the autoclaved aerated concrete layer to form a surface mortar layer. The thickness of the surface mortar layer is 5 mm.

[0057] Example 3

[0058] A floor sound insulation and heat preservation system comprises a mortar layer, an elastic layer, an autoclaved aerated concrete layer and a mortar layer which are arranged in sequence;

[0059] The autoclaved aerated concrete layer includes, by weight, 50 parts of sand, 15 parts of quicklime, 45 parts of cement, 15 parts of gypsum, 1 part of aluminum powder, 12 parts of slaked lime, 9 parts of modified fiber, 5 parts of admixture (polycarboxylate water reducer) and 100 parts of water; the raw materials are mixed, grouted, autoclaved and cured to obtain an aerated concrete precast panel.

[0060] The modified fiber includes a fiber matrix, an organic modified layer coated on the fiber matrix, and an inorganic modified layer coated on the organic modified layer; the organic modified layer is water-based acrylate-polyurethane, and the inorganic modified layer is silica aerogel and silicate; the mass content of the organic modified layer in the modified fiber is 20%, and the mass content of the inorganic modified layer in the modified fiber is 10%; the fiber matrix includes polypropylene fiber, polyester fiber and polyvinyl chloride fiber in a mass ratio of 2:1:1.

[0061] Preparation of a water-based acrylate-polyurethane emulsion: A water-based polyurethane emulsion (solid content 40%) was added to an acrylate emulsion (solid content 50%) at a mass ratio of 4:1. The mixture was stirred at 300 rpm for 60 minutes. A defoamer (BYK-024) at a concentration of 0.3% by weight of the total emulsion and a wetting agent (TEGO Wet 270) at a concentration of 1% by weight of the total emulsion were added. The pH of the emulsion was adjusted to 8.5 with aqueous ammonia and the mixture was allowed to stand for 24 hours.

[0062] The preparation method of the modified fiber is as follows: placing a fiber matrix in an aqueous acrylate-polyurethane emulsion for treatment for 48 hours to form an organic modification layer on the surface of the fiber matrix to obtain an organic modified fiber; immersing the organic modified fiber in an inorganic modification solution for reaction, wherein the mass ratio of silica aerogel to silicate in the inorganic modification solution is 4:1, the concentration of silica aerogel is 1 mol / L, the concentration of silicate is 1.6 mol / L, and the pH of the inorganic modification solution is 12 to form an inorganic modification layer covering the organic modified fiber.

[0063] The mortar layer includes, by weight, 30 parts of Portland cement, 50 parts of sand, 15 parts of rubber powder, 10 parts of cellulose, 20 parts of expanded perlite, 5 parts of short fibers, 10 parts of polystyrene particles, and 100 parts of water. The raw materials are mixed to obtain mortar.

[0064] Preparation of floor sound insulation system:

[0065] Apply mortar on the surface of the floor structure to form a bottom mortar layer with a thickness of 10mm;

[0066] Then lay an elastic layer on the surface of the mortar layer, the thickness of the elastic layer is 2mm;

[0067] Placing the aerated concrete precast panels on the elastic layer to form an autoclaved aerated concrete layer, the thickness of the autoclaved aerated concrete layer being 40 mm;

[0068] Finally, continue to apply mortar on the surface of the autoclaved aerated concrete layer to form a surface mortar layer. The thickness of the surface mortar layer is 10 mm.

[0069] Comparative Example 1

[0070] In this comparative example, the modified fiber includes a fiber matrix and an organic modified layer coated on the fiber matrix, and the rest is the same as in Example 1.

[0071] Comparative Example 2

[0072] In this comparative example, the modified fiber includes a fiber matrix and an inorganic modified layer coated on the fiber matrix, and the rest is the same as in Example 1.

[0073] Comparative Example 3

[0074] In this comparative example, the modified fiber includes a fiber matrix, an inorganic modified layer coated on the fiber matrix, and an organic modified layer coated on the inorganic modified layer. The rest is the same as in Example 1.

[0075] Comparative Example 4

[0076] In this comparative example, the floor sound insulation and thermal insulation system includes a mortar layer, an autoclaved aerated concrete layer, an elastic layer and a mortar layer arranged in sequence, and the rest is the same as in Example 1.

[0077] Comparative Example 5

[0078] In this comparative example, the thickness of the autoclaved aerated concrete layer is 30 mm, and the rest is the same as in Example 1.

[0079] Comparative Example 6

[0080] In this comparative example, the thickness of the autoclaved aerated concrete layer is 15 mm, and the rest is the same as in Example 1.

[0081] The sound insulation performance of the floor sound insulation and thermal insulation systems of the embodiment and the comparative example was measured in accordance with GB / T 19889.7-2022. The measurement results are as follows:

[0082] Table 1 Sound insulation performance test results

[0083] Group Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 Sound level / dB 51 52 51 61 62 58 60 62 64

[0084] According to Table 1 and Figure 1-2 It can be seen that compared with the comparative example, the sound level of the embodiment is 51-52dB, which is significantly lower than the sound level of the comparative example, indicating that the embodiment has better sound insulation effect.

[0085] Mechanical performance tests were conducted on the floor sound insulation and thermal insulation systems of Examples 1-3 and Comparative Examples 1-3. The compressive strength and splitting tensile strength tests were conducted in accordance with the "GB / T 50081-2019 Standard for Test Methods for Physical and Mechanical Properties of Concrete" using a YAW-3000 microcomputer-controlled constant loading pressure testing machine. The axial tensile strength test was conducted in accordance with the "GB / T 50081-2019 Standard for Test Methods for Physical and Mechanical Properties of Concrete" using a WAW-600D microcomputer-controlled universal pressure testing machine. The test results are as follows:

[0086] Table 2 Mechanical properties test results

[0087] project Compressive strength / MPa Axial compressive strength / MPa Splitting tensile strength / MPa Example 1 40.2 30.1 6.12 Example 2 38.9 29.5 5.86 Example 3 39.5 29.3 5.94 Comparative Example 1 35.8 26.5 3.75 Comparative Example 2 36.1 26.9 3.81 Comparative Example 3 36.5 27.1 4.12

[0088] As shown in Table 2, compared with Comparative Examples 1-3, the floor sound insulation and thermal insulation systems of Examples 1-3 have higher compressive strength, axial compressive strength, and splitting tensile strength, indicating that the floor sound insulation and thermal insulation systems of the Examples have better mechanical properties.

[0089] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A floor sound insulation and thermal insulation system, characterized by: It includes a mortar layer, an autoclaved aerated concrete layer and a mortar layer arranged in sequence; The autoclaved aerated concrete layer comprises, by weight, 40-50 parts of sand, 5-15 parts of quicklime, 25-45 parts of cement, 5-15 parts of gypsum, 0.3-1 parts of aluminum powder, 5-12 parts of slaked lime, 3-9 parts of modified fiber, 1-5 parts of admixture and 50-100 parts of water; The modified fiber includes a fiber matrix, an organic modified layer coated on the fiber matrix, and an inorganic modified layer coated on the organic modified layer; the organic modified layer is water-based acrylate-polyurethane, and the inorganic modified layer is silicon dioxide aerogel and silicate.

2. The floor sound insulation and thermal insulation system according to claim 1, characterized in that: The mass content of the organic modified layer in the modified fiber is 12-20%, and the mass content of the inorganic modified layer in the modified fiber is 6-10%.

3. The floor sound insulation and thermal insulation system according to claim 2, characterized in that: The modified fiber is prepared by placing a fiber matrix in an aqueous acrylate-polyurethane emulsion for modification, forming an organic modified layer on the surface of the fiber matrix to obtain an organic modified fiber; and depositing silica aerogel and silicate on the surface of the organic modified fiber to form an inorganic modified layer covering the organic modified fiber.

4. The floor sound insulation and thermal insulation system according to claim 3, characterized in that: The fiber matrix includes polypropylene fiber, polyester fiber and polyvinyl chloride fiber in a mass ratio of 2:1:

1.

5. The floor sound insulation and thermal insulation system according to claim 4, characterized in that: The silicate includes one or more of sodium silicate, calcium silicate, magnesium silicate and potassium silicate.

6. The floor sound insulation and thermal insulation system according to claim 1, characterized in that: The system further comprises an elastic layer, which is located below the bottom mortar layer or between the bottom mortar layer and the autoclaved aerated concrete layer. The elastic layer is made of rubber or foam and has a thickness of 1-2 mm.

7. The floor sound insulation and thermal insulation system according to claim 1, characterized in that: The mortar layer comprises, by weight, 20-30 parts of Portland cement, 40-50 parts of sand, 5-15 parts of rubber powder, 1-10 parts of cellulose, 10-20 parts of expanded perlite, 1-5 parts of short fibers, 1-10 parts of polystyrene particles and 70-100 parts of water.

8. The floor sound insulation and thermal insulation system according to claim 1, characterized in that: The thickness of the mortar layer is 5-10 mm, and the thickness of the autoclaved aerated concrete layer is 15-40 mm.

9. The floor sound insulation and thermal insulation system according to claim 1, characterized in that: The admixture is a polycarboxylate water reducer.

10. The method for preparing the floor sound insulation and thermal insulation system according to any one of claims 1 to 9, characterized in that: The following steps are involved: Mortar and autoclaved aerated concrete precast panels are prepared according to the raw material formula; mortar is applied on the surface of the floor structure to form a base mortar layer, an elastic layer is laid on the surface of the mortar layer, the autoclaved aerated concrete precast panels are placed on the elastic layer to form an autoclaved aerated concrete layer, and finally mortar is continued to be applied on the surface of the autoclaved aerated concrete layer to form a surface mortar layer.

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