Noise-reducing, sound-absorbing and heat-insulating rock wool board and preparation method thereof

Abstract

The invention relates to the technical field of rock wool boards, and provides a noise-reducing, sound-absorbing and heat-insulating rock wool board and a preparation method thereof. The noise-reducing, sound-absorbing and heat-insulating rock wool board is prepared from the following raw materials in parts by weight: 65 to 75 parts of basalt, 18 to 22 parts of dolomite, 12 to 18 parts of activated expanded perlite, 8 to 12 parts of cellulose nanofiber, 6 to 8 parts of stearic acid modified carbon nanotube, 5 to 8 parts of glass bead, 6 to 10 parts of binder and 45 to 55 parts of water. According to the noise-reducing, sound-absorbing and heat-insulating rock wool board provided by the invention, the raw material ratio and the preparation process are optimized, and the activated expanded perlite, the stearic acid modified nanotubes and the binder containing silicon dioxide are cooperatively used, so that the optimal noise reduction, tensile strength and hydrophobicity are realized.

Description

Technical Field

[0001] The invention relates to the technical field of rock wool boards, and in particular to a noise reduction, sound absorption and heat preservation rock wool board and a preparation method thereof. Background Art

[0002] In modern buildings and industrial environments, noise pollution has become a problem that cannot be ignored. As a new type of thermal insulation, flame retardant and sound absorbing material, rock wool board is widely used in building insulation, industrial noise reduction and other fields due to its light weight, low thermal conductivity, good sound absorption, non-flammability and good chemical stability. Especially in terms of noise reduction and sound absorption, rock wool board can effectively absorb and isolate noise with its unique porous fiber structure, creating a quiet and comfortable space for people.

[0003] The sound absorption and noise reduction principle of rock wool board is mainly based on its unique porous fiber structure. When sound waves enter the rock wool board, they will be constantly reflected, refracted and diffracted in its intricate pores. In this process, the energy of the sound waves is gradually consumed and converted into other forms of energy such as heat energy. Because the fibers inside the rock wool board are arranged in disorder and intertwined, the sound waves are constantly blocked and absorbed during the propagation process, which effectively reduces the intensity of the sound.

[0004] During the construction process of cutting and installing the existing noise-reducing, sound-absorbing and thermal insulation rock wool boards, fibers are easily scattered. These tiny fibers may float in the air. Once inhaled by construction workers, they may irritate the respiratory tract, skin, etc., causing uncomfortable symptoms such as coughing and skin itching. Long-term contact may also pose potential health risks, increasing the complexity and cost of construction. Although rock wool boards have certain hydrophobic properties, they are not completely waterproof. When exposed to a high humidity environment for a long time or subjected to a large amount of rain, rock wool boards may absorb a certain amount of moisture, resulting in a decrease in their thermal insulation performance and strength. In some outdoor building insulation projects, if the waterproofing treatment is not proper, the rock wool board will reduce the thermal insulation effect after absorbing water, and may also cause problems such as mold on the wall. Based on this, the present invention proposes a noise-reducing, sound-absorbing and thermal insulation rock wool board and a preparation method thereof. Summary of the invention

[0005] The present invention proposes a noise-reducing, sound-absorbing and heat-insulating rock wool board and a preparation method thereof, which synergistically uses activated expanded perlite, stearic acid-modified nanotubes and a binder containing silica to achieve optimal noise reduction, tensile strength and hydrophobicity. Each component plays a key role in improving the pore structure, enhancing interface bonding and reducing hygroscopicity.

[0006] The technical solution of the present invention is as follows: In a first aspect, the present invention provides a noise-reducing, sound-absorbing and heat-insulating rock wool board, which is composed of the following raw materials in parts by weight: 65-75 parts of basalt, 18-22 parts of dolomite, 12-18 parts of activated expanded perlite, 8-12 parts of cellulose nanofibers, 6-8 parts of stearic acid-modified carbon nanotubes, 5-8 parts of glass microspheres, 6-10 parts of a binder and 45-55 parts of water.

[0007] As a further technical solution, the binder is modified soybean gum, and the preparation method includes: stirring an aqueous solution of soybean protein isolate with a mass concentration of 40% to 46% at a rate of 250-350rpm for 10-15min at a temperature of 50-60°C; adding epichlorohydrin at a rate of 0.5-1mL / min, adjusting the pH to 9.0-9.5 with a 4% to 6% NaOH solution, heating to 58-62°C, stirring at 400-500rpm for 2-3h, then adding a silica aqueous dispersion to the system, dispersing at a speed of 7000-8000rpm for 20-30min under the condition of cooling water circulation, cooling to room temperature, and adjusting the pH to 7.0-7.5 with acetic acid, and finally obtaining modified soybean gum.

[0008] As a further technical solution, the preparation method of the silicon dioxide aqueous dispersion comprises: premixing nano silicon dioxide and deionized water in a weight ratio of 1:5-6, and performing ultrasonic dispersion for 20-30 minutes at a power of 300-340W and a frequency of 40-50kHz.

[0009] As a further technical solution, the weight ratio of the soy protein isolate to the nano silicon dioxide is 3-4:1.

[0010] As a further technical solution, the solid content of the modified soybean gum is 46% to 50%.

[0011] As a further technical solution, the preparation method of the activated expanded perlite comprises: preheating the expanded perlite with a particle size of 0.5-1 mm to 300-400° C., keeping the temperature for 30-40 minutes, and then naturally cooling the activated expanded perlite.

[0012] As a further technical solution, the preparation method of stearic acid-modified carbon nanotubes includes: dispersing carbon nanotubes in ethanol, adding silane coupling agent KH550, reacting at a temperature of 70-80°C for 4-5 hours, mixing with stearic acid after centrifugation and adding toluene, adding N-hydroxysuccinimide, reacting at 60-70°C for 7-8 hours, washing with toluene, and drying at 50-60°C to obtain the obtained carbon nanotubes.

[0013] As a further technical solution, the weight ratio of the carbon nanotubes, ethanol, silane coupling agent KH550, stearic acid, toluene and N-hydroxysuccinimide is 10:40-50:0.5-0.8:1.2-1.6:30-35:0.4-0.6.

[0014] In the second aspect, the present invention proposes a method for preparing a noise-reducing, sound-absorbing and heat-insulating rock wool board, the steps comprising: crushing basalt and dolomite to a particle size of ≤3mm, mixing them evenly and drying them at 100-110°C for 1.5-2.5h; then melting them at a temperature of 1500-1600°C for 2-3h to form a molten liquid, spinning the molten liquid into fibers at a speed of 2000-3000rpm through a four-roll centrifuge, the fiber diameter of which is ≤4μm, and spraying activated expanded pearls at the same time. The material is sprayed with 55% to 65% of the total amount of rock particles and binder, and then stearic acid modified carbon nanotubes and glass beads are added, and the remaining 35% to 45% of the binder and cellulose nanofiber aqueous dispersion are continued to be sprayed, pre-pressed and formed at a pressure of 0.5-1MPa, and then compacted at a pressure of 6-7MPa, cured at 110-120℃ for 50-60min, and heated to 170-180℃ and maintained for 30-40min to obtain the noise reduction, sound absorption and thermal insulation rock wool board.

[0015] As a further technical solution, the preparation method of the cellulose nanofiber aqueous dispersion comprises: mixing the cellulose nanofibers and water for pre-dispersion, and then ultrasonically treating the cellulose nanofibers for 20-30 minutes under 30-40 kHz conditions to obtain the dispersion.

[0016] The working principle and beneficial effects of the present invention are: The present invention innovatively introduces a silica aqueous dispersion, which significantly enhances the structural stability and hydrophobicity of the binder and improves the overall performance of the rock wool board. The introduction of silica enhances the structural stability of the binder and improves the tensile strength by forming a network structure, and the hydrophobicity of silica reduces the moisture absorption rate of the binder and improves the water repellency, thereby enhancing the weather resistance and service life of the rock wool board.

[0017] In the present invention, the porosity of the expanded perlite is significantly improved through activation treatment, the sound absorption performance of the rock wool board is enhanced, and the structure is supported to improve the tensile strength. The activation treatment makes the pore structure of the expanded perlite more developed, improves the porosity, and thus enhances the sound absorption performance of the rock wool board. The high porosity of the expanded perlite is not only conducive to sound absorption, but also can effectively disperse stress, participate in structural support, and improve the overall tensile strength of the rock wool board.

[0018] The present invention utilizes stearic acid to modify carbon nanotubes, which not only improves the hydrophobicity and dispersibility of the nanotubes, but also enhances the interfacial bonding force between the nanotubes and the substrate, further improving the mechanical properties and hydrophobicity of the rock wool board. The long chain structure of stearic acid gives the nanotubes good hydrophobicity, reduces the hygroscopicity of the material, and improves the weather resistance of the rock wool board. The uniform dispersion of the modified nanotubes in the rock wool board enhances the interfacial bonding force and improves the mechanical properties of the rock wool board. The introduction of nanotubes may also form a microporous structure, further enhancing the sound absorption performance of the rock wool board.

[0019] The present invention achieves the optimal combination of noise reduction, tensile strength and hydrophobicity by synergistically using activated expanded perlite, stearic acid modified nanotubes and a binder containing silicon dioxide, which embodies the perfect combination of technological innovation and component optimization. Activated expanded perlite, stearic acid modified nanotubes and a binder containing silicon dioxide form a multi-level and multi-dimensional structure in the rock wool board. These structures play a key role in improving the pore structure, enhancing the interface bonding and reducing the hygroscopicity, and jointly improve the noise reduction, tensile strength and hydrophobicity of the rock wool board. Through component optimization and synergy, the overall performance of the rock wool board is improved, meeting the high requirements of modern buildings for noise reduction, sound absorption and thermal insulation materials. DETAILED DESCRIPTION

[0020] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] It should be noted that in the present invention, the expanded perlite was purchased from Xinyang Zhongxin Perlite Co., Ltd.; the model of the cellulose nanofiber was CNF-01; the model of the glass microsphere was GB-3 (particle size 0.5-1 mm, closed porosity ≥ 85%); the model of the carbon nanotube was CNT100, with a tube diameter of 1-2 nm, a length of 5-30 μm, a purity of >90%, and a specific surface area of ​​>450 m 2 / g, purchased from Zhongke Leiming (Beijing) Technology Co., Ltd.

[0022] Example 1 A noise reduction, sound absorption and thermal insulation rock wool board is provided in this embodiment, which is composed of the following raw materials in parts by weight: 70 parts of basalt, 20 parts of dolomite, 15 parts of activated expanded perlite, 10 parts of cellulose nanofibers, 7 parts of stearic acid modified carbon nanotubes, 6 parts of glass microspheres, 8 parts of binder and 50 parts of water.

[0023] The binder is modified soybean gum, and its preparation method includes: stirring an aqueous solution of soybean protein isolate with a mass concentration of 43% at a rate of 300 rpm for 12 minutes at a temperature of 55°C; adding epichlorohydrin at a rate of 0.7 mL / min, adjusting the pH to 9.2 with a 5% NaOH solution, heating to 60°C, stirring at 450 rpm for 2.5 hours, then adding a silicon dioxide aqueous dispersion to the system, dispersing at a speed of 7500 rpm for 25 minutes under the condition of cooling water circulation, cooling to room temperature, and adjusting the pH to 7.2 with acetic acid, and finally obtaining a modified soybean gum with a solid content of 48%; the weight ratio of soybean protein isolate to silicon dioxide is 3.5:1; The preparation method of the silica aqueous dispersion is as follows: premix nano-silicon dioxide and deionized water in a weight ratio of 1:5.5, and perform ultrasonic dispersion for 25 minutes at a power of 320 W and a frequency of 45 kHz to obtain the dispersion.

[0024] The preparation method of activated expanded perlite comprises: preheating expanded perlite with a particle size of 0.7 mm to 350° C., keeping the temperature for 35 minutes, and then naturally cooling the activated expanded perlite.

[0025] The preparation method of stearic acid-modified carbon nanotubes includes: dispersing carbon nanotubes in ethanol, adding silane coupling agent KH550, reacting at 75°C for 4.5 hours, mixing with stearic acid after centrifugation and adding toluene, adding N-hydroxysuccinimide, reacting at 65°C for 7.5 hours, washing with toluene, and drying at 55°C to obtain the obtained product; the weight ratio of carbon nanotubes, ethanol, silane coupling agent KH550, stearic acid, toluene and N-hydroxysuccinimide is 10:45:0.6:1.4:32:0.5.

[0026] The preparation method of the noise-reducing, sound-absorbing and heat-insulating rock wool board comprises the following steps: crushing basalt and dolomite to a particle size of 3 mm, mixing them uniformly and drying them at 105° C. for 2 hours; then melting them at a temperature of 1550° C. for 2.5 hours to form a molten liquid, spinning the molten liquid into fibers at a rotation speed of 2500 rpm through a four-roll centrifuge, wherein the fiber diameter is 4 μm, and simultaneously spraying activated expanded perlite particles and 60% of the total amount of a binder, then adding stearic acid-modified carbon nanotubes and glass microbeads, and continuing to spray the remaining 40% of the binder and a cellulose nanofiber aqueous dispersion, pre-pressing and shaping them at a pressure of 0.7 MPa, then pressing and compacting them at a pressure of 6.5 MPa, curing them at 115° C. for 55 minutes, heating them to 175° C. and maintaining them for 35 minutes to obtain the noise-reducing, sound-absorbing and heat-insulating rock wool board; wherein the preparation method of the cellulose nanofiber aqueous dispersion comprises: mixing the cellulose nanofibers and water for pre-dispersion, and ultrasonically treating them at 35 kHz for 25 minutes to obtain the rock wool board.

[0027] Example 2 A noise reduction, sound absorption and thermal insulation rock wool board is provided in this embodiment, which is composed of the following raw materials in parts by weight: 65 parts of basalt, 18 parts of dolomite, 12 parts of activated expanded perlite, 8 parts of cellulose nanofibers, 6 parts of stearic acid modified carbon nanotubes, 5 parts of glass microspheres, 6 parts of binder and 45 parts of water.

[0028] The binder is modified soybean gum, and its preparation method includes: stirring an aqueous solution of soybean protein isolate with a mass concentration of 40% at a rate of 250 rpm for 10 minutes at a temperature of 50°C; adding epichlorohydrin at a rate of 0.5 mL / min, adjusting the pH to 9.0 with a 4% NaOH solution, heating to 58°C, stirring at 400 rpm for 2 hours, then adding a silicon dioxide aqueous dispersion to the system, dispersing at a speed of 7000 rpm for 20 minutes under the condition of cooling water circulation, cooling to room temperature, and adjusting the pH to 7.0 with acetic acid, and finally obtaining a modified soybean gum with a solid content of 46%; the weight ratio of soybean protein isolate to silicon dioxide is 3:1; The preparation method of the silica aqueous dispersion is as follows: premix nano-silicon dioxide and deionized water in a weight ratio of 1:5, and perform ultrasonic dispersion for 20 minutes at a power of 300 W and a frequency of 40 kHz to obtain the dispersion.

[0029] The preparation method of activated expanded perlite comprises: preheating expanded perlite with a particle size of 0.5 mm to 300° C., keeping the temperature for 30 minutes, and then naturally cooling the activated expanded perlite.

[0030] The preparation method of stearic acid-modified carbon nanotubes includes: dispersing carbon nanotubes in ethanol, adding silane coupling agent KH550, reacting at 70°C for 4 hours, mixing with stearic acid after centrifugation and adding toluene, adding N-hydroxysuccinimide, reacting at 60°C for 7 hours, washing with toluene, and drying at 50°C to obtain the obtained product; the weight ratio of carbon nanotubes, ethanol, silane coupling agent KH550, stearic acid, toluene and N-hydroxysuccinimide is 10:40:0.5:1.2:30:0.4.

[0031] The preparation method of the noise-reducing, sound-absorbing and heat-insulating rock wool board comprises the following steps: crushing basalt and dolomite to a particle size of 3 mm, mixing them uniformly and drying them at 100° C. for 1.5 hours; then melting them at a temperature of 1500° C. for 2 hours to form a molten liquid, spinning the molten liquid into fibers at a rotation speed of 2000 rpm through a four-roll centrifuge, wherein the fiber diameter is 4 μm, and simultaneously spraying activated expanded perlite particles and 60% of the total amount of a binder, then adding stearic acid-modified carbon nanotubes and glass microbeads, and continuing to spray the remaining 40% of the binder and a cellulose nanofiber aqueous dispersion, pre-pressing and shaping them at a pressure of 0.5 MPa, then pressing and compacting them at a pressure of 6 MPa, curing them at 110° C. for 50 minutes, heating them to 170° C. and maintaining them for 30 minutes to obtain the noise-reducing, sound-absorbing and heat-insulating rock wool board; wherein the preparation method of the cellulose nanofiber aqueous dispersion comprises: mixing the cellulose nanofibers and water for pre-dispersion, and ultrasonically treating them at 30 kHz for 20 minutes to obtain the rock wool board.

[0032] Example 3 A noise reduction, sound absorption and thermal insulation rock wool board is provided in this embodiment, which is composed of the following raw materials in parts by weight: 75 parts of basalt, 22 parts of dolomite, 18 parts of activated expanded perlite, 12 parts of cellulose nanofibers, 8 parts of stearic acid modified carbon nanotubes, 8 parts of glass microspheres, 10 parts of binder and 55 parts of water.

[0033] The binder is modified soybean gum, and the preparation method thereof comprises: stirring an aqueous solution of soybean protein isolate with a mass concentration of 46% at a rate of 350 rpm for 15 min at a temperature of 60°C; dropping epichlorohydrin at a rate of 1 mL / min, adjusting the pH to 9.5 with a 6% NaOH solution, heating to 62°C, stirring at 500 rpm for 3 h, then adding a silica aqueous dispersion to the system, dispersing at a speed of 8000 rpm for 30 min under the condition of cooling water circulation, cooling to room temperature, adjusting the pH to 7.5 with acetic acid, and finally obtaining a modified soybean gum with a solid content of 50%; the weight ratio of soybean protein isolate to silica is 4:1; The preparation method of the silica aqueous dispersion is as follows: premix nano-silicon dioxide and deionized water in a weight ratio of 1:6, and perform ultrasonic dispersion for 30 minutes at a power of 340 W and a frequency of 50 kHz to obtain the dispersion.

[0034] The preparation method of activated expanded perlite comprises: preheating expanded perlite with a particle size of 1 mm to 400° C., keeping the temperature for 40 minutes, and then naturally cooling the activated expanded perlite.

[0035] The preparation method of stearic acid-modified carbon nanotubes includes: dispersing carbon nanotubes in ethanol, adding silane coupling agent KH550, reacting at 80°C for 5 hours, mixing with stearic acid after centrifugation and adding to toluene, adding N-hydroxysuccinimide, reacting at 70°C for 8 hours, washing with toluene, and drying at 60°C to obtain the obtained product; the weight ratio of carbon nanotubes, ethanol, silane coupling agent KH550, stearic acid, toluene and N-hydroxysuccinimide is 10:50:0.8:1.6:35:0.6.

[0036] The preparation method of the noise-reducing, sound-absorbing and heat-insulating rock wool board comprises the following steps: crushing basalt and dolomite to a particle size of 3 mm, mixing them evenly, and drying them at 110° C. for 2.5 hours; then melting them at 1600° C. for 3 hours to form a molten liquid, spinning the molten liquid into fibers at a rotation speed of 3000 rpm through a four-roll centrifuge, and the fiber diameter is 4 μm; at the same time, 60% of the total amount of activated expanded perlite particles and a binder are sprayed into the molten liquid; then, stearic acid-modified carbon nanotubes and glass microbeads are added; the remaining 40% of the binder and a cellulose nanofiber aqueous dispersion are continuously sprayed into the molten liquid; pre-pressing and shaping the molten liquid at a pressure of 1 MPa; then, pressing and compacting the molten liquid at a pressure of 7 MPa; curing the molten liquid at 120° C. for 60 minutes; heating the molten liquid to 180° C. and maintaining the molten liquid at 40 minutes to obtain the noise-reducing, sound-absorbing and heat-insulating rock wool board; wherein, the preparation method of the cellulose nanofiber aqueous dispersion comprises: mixing the cellulose nanofibers and water for pre-dispersion, and ultrasonically treating the cellulose nanofibers at 40 kHz for 30 minutes to obtain the cellulose nanofiber aqueous dispersion.

[0037] Example 4 In the present embodiment, a noise reduction, sound absorption and thermal insulation rock wool board is provided, which is composed of the following raw materials in parts by weight: 65 parts of basalt, 22 parts of dolomite, 12 parts of activated expanded perlite, 12 parts of cellulose nanofibers, 6 parts of stearic acid modified carbon nanotubes, 8 parts of glass microspheres, 6 parts of binder and 55 parts of water.

[0038] The binder is modified soybean gum, and its preparation method includes: stirring an aqueous solution of soybean protein isolate with a mass concentration of 40% at a rate of 250 rpm for 15 minutes at a temperature of 60°C; adding epichlorohydrin at a rate of 0.5 mL / min, adjusting the pH to 9.0 with a 6% NaOH solution, heating to 62°C, stirring at 400 rpm for 3 hours, then adding a silicon dioxide aqueous dispersion to the system, dispersing at a speed of 7000 rpm for 30 minutes under the condition of cooling water circulation, cooling to room temperature, and adjusting the pH to 7.0 with acetic acid, and finally obtaining a modified soybean gum with a solid content of 50%; the weight ratio of soybean protein isolate to silicon dioxide is 3:1; The preparation method of the silica aqueous dispersion is as follows: premix nano-silicon dioxide and deionized water in a weight ratio of 1:6, and perform ultrasonic dispersion for 20 minutes at a power of 300 W and a frequency of 50 kHz to obtain the dispersion.

[0039] The preparation method of activated expanded perlite comprises: preheating expanded perlite with a particle size of 0.5 mm to 400° C., keeping the temperature for 30 minutes, and then naturally cooling the activated expanded perlite.

[0040] The preparation method of stearic acid-modified carbon nanotubes includes: dispersing carbon nanotubes in ethanol, adding silane coupling agent KH550, reacting at 80°C for 4 hours, mixing with stearic acid after centrifugation and adding toluene, adding N-hydroxysuccinimide, reacting at 70°C for 7 hours, washing with toluene, and drying at 60°C to obtain the obtained product; the weight ratio of carbon nanotubes, ethanol, silane coupling agent KH550, stearic acid, toluene and N-hydroxysuccinimide is 10:40:0.8:1.6:30:0.6.

[0041] The preparation method of the noise-reducing, sound-absorbing and heat-insulating rock wool board comprises the following steps: crushing basalt and dolomite to a particle size of 3 mm, mixing them evenly and drying them at 100° C. for 2.5 hours; then melting them at a temperature of 1500° C. for 3 hours to form a molten liquid, spinning the molten liquid into fibers at a rotation speed of 2000 rpm through a four-roll centrifuge, and the fiber diameter is 4 μm; at the same time, 60% of the total amount of activated expanded perlite particles and a binder are sprayed in, and then stearic acid-modified carbon nanotubes and glass microbeads are added, and the remaining 40% of the binder and a cellulose nanofiber aqueous dispersion are continuously sprayed in, pre-pressing and shaping them at a pressure of 1 MPa, and then pressing and compacting them at a pressure of 6 MPa, curing them at 120° C. for 50 minutes, and heating them to 180° C. and maintaining them for 30 minutes to obtain the noise-reducing, sound-absorbing and heat-insulating rock wool board; wherein the preparation method of the cellulose nanofiber aqueous dispersion comprises: mixing the cellulose nanofibers and water for pre-dispersion, and ultrasonically treating them at 40 kHz for 20 minutes.

[0042] Comparative Example 1 Adjustments were made on the basis of Example 1. The difference from Example 1 was that no silicon dioxide aqueous dispersion was added during the preparation of the modified soybean gum in Comparative Example 1 for further mixing and dispersion.

[0043] Comparative Example 2 Adjustments were made on the basis of Example 1. Different from Example 1, the expanded perlite in Comparative Example 2 was not activated.

[0044] Comparative Example 3 Adjustments were made on the basis of Example 1. Different from Example 1, in Comparative Example 3, no activated expanded perlite was added to the raw materials.

[0045] Comparative Example 4 Adjustments were made on the basis of Example 1. The difference from Example 1 was that in Comparative Example 4, the stearic acid-modified carbon nanotubes were replaced by carbon nanotubes modified with a silane coupling agent, and no stearic acid was added during the modification process. The preparation method of the carbon nanotubes modified with a silane coupling agent included: dispersing the carbon nanotubes in ethanol, adding silane coupling agent KH550, reacting at a temperature of 75°C for 4.5h, washing with ethanol, and drying at 55°C to obtain the obtained product; the weight ratio of the carbon nanotubes, ethanol, and the silane coupling agent KH550 was 10:45:0.6.

[0046] Comparative Example 5 Adjustments were made on the basis of Example 1. The difference from Example 1 was that the carbon nanotubes in Comparative Example 5 were not modified with stearic acid, and the carbon nanotubes were directly used as raw materials.

[0047] Comparative Example 6 Adjustments were made based on Example 1. The difference from Example 1 was that in Comparative Example 6, no stearic acid-modified carbon nanotubes were added to the raw materials.

[0048] Test Example 1: The fire-retardant rock wool board (thickness 150 mm, density 110 kg / m 3 ) to perform the following test: Noise reduction coefficient: tested in accordance with GB / T 20247-2006; Tensile strength perpendicular to the surface: Tested in accordance with GB / T30804-2014 "Determination of tensile strength of thermal insulation products for building perpendicular to the surface"; Mass moisture absorption rate: Tested in accordance with GB / T 5480-2017; Water repellency: Tested in accordance with GB / T 10299-2011; The results are shown in Table 1 below: Table 1

[0049] In Comparative Example 1, no silica aqueous dispersion was added, resulting in a decrease in binder performance, a significant decrease in tensile strength, an increase in moisture absorption, and a decrease in hydrophobicity, indicating that silica can enhance the structural stability and hydrophobicity of the binder. In Comparative Example 2, the use of unactivated expanded perlite resulted in a decrease in the noise reduction coefficient, indicating that the activation treatment increased the porosity of the material and enhanced the sound absorption performance. In Comparative Example 3, no activated expanded perlite was added at all, further reducing the noise reduction coefficient to 0.65, and the tensile strength decreased, indicating that it not only improved the sound absorption, but also participated in structural support. In Comparative Example 4, only the hydrophobicity of the nanotubes modified with silane coupling agent decreased significantly, proving that stearic acid is the key to hydrophobicity. The tensile strength and hydrophobicity of Comparative Examples 5 and 6 are inferior to those of Example 1, indicating that stearic acid modification can improve the dispersibility and interfacial bonding of nanotubes, thereby enhancing mechanical properties and hydrophobicity.

[0050] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A noise reduction, sound absorption and thermal insulation rock wool board, characterized in that: It is composed of the following raw materials in parts by weight: 65-75 parts of basalt, 18-22 parts of dolomite, 12-18 parts of activated expanded perlite, 8-12 parts of cellulose nanofibers, 6-8 parts of stearic acid-modified carbon nanotubes, 5-8 parts of glass microspheres, 6-10 parts of binder and 45-55 parts of water.

2. The noise reduction, sound absorption and thermal insulation rock wool board according to claim 1, characterized in that: The binder is modified soybean gum, and the preparation method comprises: adding epichlorohydrin dropwise at a rate of 0.5-1 mL / min to an aqueous solution of soybean protein isolate with a mass concentration of 40% to 46%, heating and stirring, then adding a silicon dioxide aqueous dispersion to the system, stirring and dispersing under the condition of cooling water circulation, adjusting the pH to 7.0-7.5, and finally obtaining modified soybean gum.

3. The noise reduction, sound absorption and thermal insulation rock wool board according to claim 2, characterized in that: The preparation method of the silicon dioxide aqueous dispersion comprises: premixing nano silicon dioxide and deionized water in a weight ratio of 1:5-6, and performing ultrasonic dispersion for 20-30 minutes at a power of 300-340W and a frequency of 40-50kHz.

4. The noise reduction, sound absorption and thermal insulation rock wool board according to claim 3, characterized in that: The weight ratio of the soy protein isolate to the nano silicon dioxide is 3-4:

1.

5. The noise reduction, sound absorption and thermal insulation rock wool board according to claim 2, characterized in that: The solid content of the modified soybean gum is 46% to 50%.

6. The noise reduction, sound absorption and thermal insulation rock wool board according to claim 1, characterized in that: The preparation method of the activated expanded perlite comprises: preheating the expanded perlite with a particle size of 0.5-1 mm to 300-400° C., keeping the temperature for 30-40 minutes, and then naturally cooling the activated expanded perlite.

7. The noise reduction, sound absorption and thermal insulation rock wool board according to claim 1, characterized in that: The preparation method of stearic acid modified carbon nanotubes comprises: dispersing carbon nanotubes in ethanol, adding silane coupling agent KH550, reacting at a temperature of 70-80° C. for 4-5 hours, mixing with stearic acid after centrifugation, adding toluene, continuously adding N-hydroxysuccinimide for reaction, washing and drying to obtain the carbon nanotubes.

8. The noise reduction, sound absorption and heat preservation rock wool board according to claim 7, characterized in that: The weight ratio of the carbon nanotube, ethanol, silane coupling agent KH550, stearic acid, toluene and N-hydroxysuccinimide is 10:40-50:0.5-0.8:1.2-1.6:30-35:0.4-0.

6.

9. A method for preparing the noise reduction, sound absorption and thermal insulation rock wool board according to any one of claims 1 to 8, characterized in that the steps include: The basalt and dolomite are crushed, mixed evenly and then dried; Subsequently, the mixture is melted at a temperature of 1500-1600°C for 2-3 hours to form a molten liquid, which is centrifugally spun into fibers with a fiber diameter of ≤4μm. At the same time, 55% to 65% of the total amount of activated expanded perlite particles and a binder are sprayed in, followed by the addition of stearic acid-modified carbon nanotubes and glass microbeads, and the remaining 35% to 45% of the binder and a cellulose nanofiber aqueous dispersion are continued to be sprayed in. The mixture is pre-pressed and shaped at a pressure of 0.5-1MPa, and then compacted at a pressure of 6-7MPa. After curing, the noise reduction, sound absorption and thermal insulation rock wool board is obtained.

10. The method for preparing the noise reduction, sound absorption and thermal insulation rock wool board according to claim 9, characterized in that: The preparation method of the cellulose nanofiber aqueous dispersion comprises: mixing the cellulose nanofiber and water for pre-dispersion, and then performing ultrasonic treatment at 30-40kHz for 20-30 minutes to obtain the dispersion.

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