A cement-based sound-absorbing board and its preparation method and application

Abstract

The present application discloses a cement-based sound-absorbing board and its preparation method and application. In the first aspect of the present application, a cement-based sound-absorbing board is provided. The raw materials for preparing the cement-based sound-absorbing board include: inorganic hydraulic cementitious material, modified porous lightweight aggregate, foaming agent, foam stabilizer, water reducer, second waterproof agent and water. The modified porous lightweight aggregate is a natural porous lightweight aggregate obtained by surface modification treatment with a first waterproof agent. Compared with the existing sound-absorbing materials, a larger amount of natural porous lightweight aggregate is introduced into the sound-absorbing board of the present application, which plays a role in supporting the cavity structure and providing an effective path for sound wave propagation. While greatly improving the sound insulation performance of the sound-absorbing board, the collapse problem caused by the introduction of high-component lightweight aggregate into the system is avoided.

Description

Technical Field

[0001] The present application relates to the technical field of noise reduction, and in particular to a cement-based sound-absorbing board and a preparation method and application thereof. Background Art

[0002] Common indoor noise comes from a wide range of sources, including the operation noise of various mechanical equipment, such as fans, air conditioners, water pumps and other equipment noise; human activity noise, such as talking, footsteps, moving objects and other human noise; external environmental noise, such as road traffic noise, railway noise, aviation noise and other environmental noise that enters the room through the outer shell. The frequency range of these noises is complex, including low-frequency noise, medium-frequency noise and high-frequency noise. Long-term exposure not only seriously affects people's quality of life, but may also cause psychological problems or other diseases. Therefore, it is necessary to improve the existing sound insulation and noise reduction technical solutions. Currently, commonly used sound insulation and noise reduction products include ordinary concrete sound-absorbing panels, rock wool sound-absorbing panels, foam aluminum panels, etc., but ordinary concrete sound-absorbing panels have poor sound absorption effects, and the sound absorption coefficient is usually only about 0.3, which cannot meet the noise reduction requirements of many places. Therefore, it is urgent to develop a new type of sound-absorbing panel product with better noise reduction effect. Summary of the invention

[0003] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a cement-based sound-absorbing board and a preparation method and application thereof, which can solve the problem of poor noise reduction effect.

[0004] In a first aspect of the present application, a cement-based sound-absorbing board is provided. The raw materials for preparing the cement-based sound-absorbing board include: an inorganic hydraulic cementitious material, a modified porous lightweight aggregate, a foaming agent, a foam stabilizer, a water reducer, a second waterproofing agent and water. The modified porous lightweight aggregate is a natural porous lightweight aggregate that is surface-modified by a first waterproofing agent.

[0005] The cement-based sound-absorbing board according to the embodiment of the present application has at least the following beneficial effects:

[0006] Compared with the existing sound-absorbing materials, a large amount of natural porous lightweight aggregate is introduced into the sound-absorbing board of the present application. This natural porous lightweight aggregate plays a role in supporting the cavity structure during the preparation process of the sound-absorbing board, and can prevent the collapse of bubbles generated by the foaming agent. At the same time, the natural porous lightweight aggregate also provides an effective path for the propagation of sound waves in the continuous pore structure. Compared with traditional foam concrete panels, it has better sound wave absorption and noise reduction effects. However, it was also found during the experiment that the large-scale use of natural porous lightweight aggregates will also lead to the problem of additional foam collapse, affecting the sound insulation effect. For this reason, the natural porous lightweight aggregate was pre-treated with a surface modification of a waterproofing agent before mixing. The modified natural porous lightweight aggregate surface forms a moderately rough structure, which can increase the physical adsorption points of bubbles, so that more bubbles can be formed during the physical foaming process, further increasing the sound wave absorption effect; and the aggregate surface can provide an additional hydrophobic layer, so that water and foam can enter the interior of the aggregate in a more effective way to ensure the stability of the system. Through the above method, the sound insulation performance of the sound-absorbing board is greatly improved while avoiding the collapse problem caused by the introduction of high-component lightweight aggregate into the system.

[0007] Among them, natural porous lightweight aggregate refers to aggregate with a bulk density of 1200kg / m 3 The following natural aggregates can be, for example, 1000, 800, 600, 400, 200 kg / m 3 The following natural aggregates.

[0008] In some embodiments of the present application, the first waterproofing agent and the second waterproofing agent are independently selected from at least one of silane waterproofing agents, acrylic waterproofing agents, fatty acid waterproofing agents and styrene waterproofing agents. Among them, silane waterproofing agents are also called silicone waterproofing agents, which contain hydrophobic groups (such as alkyl groups) and hydrophilic groups or hydrolyze to form hydrophilic groups (such as alkoxy groups, epoxy groups, etc.). For example, they can be at least one of silane and siloxane, such as aqueous emulsions of silane and polysiloxane. Fatty acid waterproofing agents can be, for example, long-chain fatty acid waterproofing agents, such as stearic acid waterproofing agents. Others such as styrene waterproofing agents and acrylic waterproofing agents can be, for example, emulsions made by adding styrene resins and acrylic resins to emulsifiers, fillers and additives. In some embodiments, the first waterproofing agent and the second waterproofing agent are the same waterproofing agent.

[0009] In some embodiments of the present application, the natural porous lightweight aggregate includes at least one of expanded perlite, vermiculite and wood chips.

[0010] In some embodiments of the present application, the inorganic hydraulic cementitious material includes cement, for example, depending on the hydraulic material, it can be at least one of silicate cement, aluminate cement, sulphoaluminate cement, ferroaluminate cement, fluoroaluminate cement, phosphate cement, pozzolanic cement, etc. In some specific embodiments, the inorganic hydraulic cementitious material includes silicate cement, such as at least one of silicate cement and ordinary silicate cement, for example, it can be silicate cement with a compressive strength of more than 42.5 MPa.

[0011] In some embodiments of the present application, the raw materials for preparing the cement-based sound-absorbing board include, by mass percentage, 25-55% of inorganic hydraulic cementitious material, 5-15% of modified porous lightweight aggregate, 0.05-1% of foaming agent, 0.02-0.2% of foam stabilizer, 0.05-1% of water reducer, 0.05-0.5% of second waterproof agent and 35-65% of water. The inorganic hydraulic cementitious material can be, for example, 25, 30, 35, 40, 45, 50, 55%, the modified porous lightweight aggregate can be, for example, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15%, the foaming agent can be, for example, 0.05, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1%, and the foam stabilizer can be, for example, 0.02, 0.04, 0.06, 0.08, 0.1 , 0.12, 0.14, 0.16, 0.18, 0.2%, the water reducer can be, for example, 0.05, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1%, the second waterproofing agent can be, for example, 0.05, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5%, and water can be, for example, 35, 40, 45, 50, 55, 60, 65%.

[0012] In some embodiments of the present application, the raw materials for preparing the cement-based sound-absorbing board include, by mass percentage, 35-45% of inorganic hydraulic cementitious material, 8-12% of modified porous lightweight aggregate, 0.2-0.3% of foaming agent, 0.08-0.12% of foam stabilizer, 0.2-0.3% of water reducer, 0.15-0.25% of second waterproofing agent and 45-52% of water.

[0013] In some embodiments of the present application, the foaming agent includes at least one of a surfactant foaming agent and a protein foaming agent.

[0014] In some embodiments of the present application, the surfactant foaming agent includes at least one of a cationic surfactant foaming agent, an anionic surfactant foaming agent, and a non-ionic surfactant foaming agent, for example, sodium alcohol polyoxyethylene ether sulfate (AES), cocamidopropyl betaine (CAB), sodium α-olefin sulfonate (AOS), etc.

[0015] In some embodiments of the present application, the protein foaming agent includes at least one of a tea saponin foaming agent, a saponin foaming agent, a hydrolyzed animal hoof horn foaming agent, a hydrolyzed hair foaming agent, and a hydrolyzed blood gel foaming agent.

[0016] In some embodiments of the present application, the foam stabilizer includes at least one of hydroxypropyl methylcellulose, polyvinyl alcohol, polysorbate, and starch ether.

[0017] In some embodiments of the present application, the particle size of the natural porous lightweight aggregate is not greater than 3 mm. Setting the particle size of the natural porous lightweight aggregate to be less than or equal to 3 mm can prevent the aggregate particle size from being too large and destroying the continuous pore structure in the mixture.

[0018] In some embodiments of the present application, the viscosity of the foam stabilizer is 20 to 100,000 mPa·s. Controlling the viscosity of the foam stabilizer within the above range can ensure that the foam structure can remain stable and not collapse during the physical foaming process and after the foam is formed, while increasing the viscosity of the mixture.

[0019] In some embodiments of the present application, the method of modifying the natural porous lightweight aggregate includes mixing the natural porous lightweight aggregate with a first waterproofing agent to modify the surface thereof.

[0020] A second aspect of the present application provides a method for preparing a cement-based sound-absorbing board, comprising the following steps:

[0021] The natural porous lightweight aggregate is immersed in a first waterproofing agent, taken out and dried to obtain a modified porous lightweight aggregate;

[0022] The inorganic hydraulic cementitious material, the modified porous lightweight aggregate, part of the water, the water reducing agent and the second waterproofing agent are mixed and stirred uniformly to obtain a slurry;

[0023] After mixing the foaming agent, the remaining water and the foam stabilizer, the foam is generated by physical foaming to obtain a foam mixture;

[0024] The slurry and the foam mixture are mixed to obtain a mixture, which is then molded and cured to obtain a cement-based sound-absorbing board.

[0025] In this preparation method, the foaming agent is mixed with water and physically foamed to uniformly introduce a large number of continuous tiny bubbles into the mixture. During the preparation of the sound-absorbing board, these bubbles will gradually fix as the inorganic hydraulic cementitious material hardens, forming a stable continuous pore structure. This brings excellent sound wave absorption and noise reduction effects to the product.

[0026] In some embodiments of the present application, the volume ratio of the foaming agent to the remaining water is 1:20 to 80, for example, it can be 1:20, 30, 40, 50, 60, 70, or 80.

[0027] In some embodiments of the present application, physical foaming includes at least one of high-speed shear stirring and foaming by a foaming machine.

[0028] A third aspect of the present application provides an application of a cement-based sound-absorbing board in building sound insulation and noise reduction.

[0029] In a fourth aspect of the present application, a facility is provided, which includes any of the aforementioned cement-based sound-absorbing panels, which can be used in, for example, walls, floors, roads, viaducts, light rails, subways and other building-related facilities, and play a good role in noise reduction and sound absorption.

[0030] The sound-absorbing board provided by the present application has good sound absorption effect, and the sound absorption coefficient can reach 0.6, which is twice as high as that of similar concrete sound-absorbing boards (same thickness); the preparation raw materials and preparation process are green, environmentally friendly, and pollution-free, and do not use rock wool and other materials that may cause pollution; the cost is low and the raw materials are easily available.

[0031] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 : is a photo of a cement-based sound-absorbing board prepared in one embodiment of the present application, wherein A, B and C are photos of its upper surface, side surface and after demoulding, respectively.

[0033] Figure 2 It is the test result of the noise reduction coefficient of the sound absorbing panel in one embodiment of the present application. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the concept of the present application and the technical effects produced in combination with the embodiments, so as to fully understand the purpose, features and effects of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of them. Based on the embodiments of the present application, other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of the present application.

[0035] The embodiments of the present application are described in detail below. The described embodiments are exemplary and are only used to explain the present application, and should not be understood as limiting the present application.

[0036] In the description of this application, "several" means more than one, "more" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0037] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein are only for the purpose of describing the embodiments of this application and are not intended to limit this application.

[0038] In the description of the present application, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0039] Example 1

[0040] This embodiment prepares a cement-based sound-absorbing board, comprising the following steps:

[0041] S0: Soak vermiculite (particle size is less than or equal to 3 mm) in a silane waterproofing agent, take it out and dry it to obtain modified vermiculite for use.

[0042] S1: Weigh 40 parts of cement, 10 parts of modified vermiculite, 35 parts of water, 0.25 parts of high-performance water reducing agent, and 0.20 parts of sodium stearate, and mix them, and stir them mechanically for 3 minutes to obtain a slurry.

[0043] S2: 0.25 parts of a protein foaming agent, 0.1 parts of hydroxypropyl methylcellulose (viscosity of 100,000 mPa·s) and 14 parts of water were weighed and mixed according to the same mass parts, and foam was generated by high-speed mechanical stirring for 2 minutes to obtain a foam mixture.

[0044] S3: Mix the slurry and foam mixture, stir mechanically for 5 minutes, pour into the mold, vibrate on a vibration table for 10 seconds, then perform standard curing, cover with plastic film and seal, and form after 28 days. Figure 1.

[0045] The formed cement-based sound-absorbing panels were tested according to the "Acoustic Reverberation Chamber Sound Absorption Measurement" (GB T 20247-2006). The results are shown in Table 1 and Figure 2 :

[0046] Table 1. Sound absorption coefficient test results

[0047] Frequency / Hz 200 250 315 400 500 630 800 Sound absorption coefficient αs 0.44 0.51 0.58 0.78 0.86 0.77 0.61 Frequency / Hz 1000 1250 1600 2000 2500 3150 4000 Sound absorption coefficient αs 0.51 0.55 0.75 0.68 0.63 0.71 0.68

[0048] According to the above results, referring to GB / T16731-1997 "Sound absorption performance classification of building sound absorption products", the noise reduction coefficient NRC of the cement-based sound-absorbing board is 0.6, and the sound absorption performance of its sound absorption structure is grade II.

[0049] Comparative Example 1:

[0050] This comparative example prepares a cement-based sound-absorbing board, comprising the following steps:

[0051] S1: Weigh 40 parts of cement, 10 parts of untreated vermiculite (particle size is less than or equal to 3 mm), 35 parts of water, 0.25 parts of high-performance water reducer, and 0.20 parts of sodium stearate, mix them, stir mechanically for 3 minutes, obtain slurry, and pour it into a mold.

[0052] S2: Weigh 0.5 parts of 30% hydrogen peroxide, 0.1 parts of hydroxypropyl methylcellulose (viscosity of 100000 mPa·s) and 14 parts of water, mix them, add them to the slurry in the mold, stir for 1 minute, let it stand for 2 minutes, and wait for the chemical foaming to be completed.

[0053] S3: Perform standard curing on the mold, cover it with plastic film and seal it, and observe the molding condition after 28 days.

[0054] The results showed that during the curing process, the cement-based sound-absorbing board provided in the comparative example collapsed and failed to be successfully formed.

[0055] Example 2

[0056] This embodiment provides a cement-based sound-absorbing board, which is different from Embodiment 1 in that in S0, the vermiculite is immersed in an acrylic waterproofing agent for modification.

[0057] Example 3

[0058] This embodiment provides a cement-based sound-absorbing board, which is different from Embodiment 1 in that in S0, vermiculite is immersed in a sodium stearate waterproofing agent for modification.

[0059] Example 4

[0060] This embodiment provides a cement-based sound-absorbing board, which is different from Embodiment 1 in that in S0, the vermiculite is immersed in a styrene-based waterproofing agent for modification.

[0061] Example 5

[0062] This embodiment provides a cement-based sound-absorbing board, which is different from Embodiment 1 in that the sodium stearate in S1 is replaced by a styrene-based waterproofing agent with the same solid content.

[0063] Example 6

[0064] This embodiment provides a cement-based sound-absorbing board, which is different from Embodiment 1 in that the sodium stearate in S1 is replaced by an acrylic waterproofing agent with the same solid content.

[0065] Example 7

[0066] This embodiment provides a cement-based sound-absorbing board, which differs from Embodiment 1 in that the protein foaming agent in S2 is replaced by AES of equal mass.

[0067] Example 8

[0068] This embodiment provides a cement-based sound-absorbing board, which differs from Embodiment 1 in that the protein foaming agent in S2 is replaced by CAB of equal mass.

[0069] Example 9

[0070] This embodiment provides a cement-based sound-absorbing board, which is different from Embodiment 1 in that the protein foaming agent in S2 is replaced by AOS of the same mass.

[0071] Example 10

[0072] This embodiment provides a cement-based sound-absorbing board, which is different from the embodiment 1 in that the hydroxypropyl methylcellulose in S2 is replaced by polyvinyl alcohol with a viscosity of 1000 mPa·s.

[0073] Embodiments 2 to 10 can achieve similar sound absorption effects as embodiment 1 according to the above detection method, which will not be described in detail here.

[0074] The present application is described in detail above in conjunction with the embodiments, but the present application is not limited to the above embodiments, and various changes can be made within the knowledge of ordinary technicians in the relevant technical field without departing from the purpose of the present application. In addition, the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

Claims

1. Cement-based sound-absorbing board, characterized in that: The raw materials for preparing the cement-based sound-absorbing board include, by mass percentage, 25-55% of inorganic hydraulic cementitious material, 5-15% of modified porous lightweight aggregate, 0.05-1% of foaming agent, 0.02-0.2% of foam stabilizer, 0.05-1% of water reducer, 0.05-0.5% of second waterproofing agent and 35-65% of water. The modified porous lightweight aggregate is obtained by surface modification of natural porous lightweight aggregate with a first waterproofing agent. The first waterproofing agent and the second waterproofing agent are independently selected from at least one of silane waterproofing agent, acrylic waterproofing agent, fatty acid waterproofing agent and styrene waterproofing agent. The particle size of the natural porous lightweight aggregate is not greater than 3 mm.

2. The cement-based sound-absorbing board according to claim 1, characterized in that: The natural porous lightweight aggregate includes at least one of expanded perlite, vermiculite and wood chips.

3. The cement-based sound-absorbing board according to claim 1, characterized in that: The raw materials for preparing the cement-based sound-absorbing board include, by mass percentage, 35-45% of inorganic hydraulic cementitious material, 8-12% of modified porous lightweight aggregate, 0.2-0.3% of foaming agent, 0.08-0.12% of foam stabilizer, 0.2-0.3% of water reducer, 0.15-0.25% of second waterproof agent and 45-52% of water.

4. The cement-based sound-absorbing board according to claim 1, characterized in that: The foaming agent includes at least one of a surfactant foaming agent and a protein foaming agent, and / or the foam stabilizer includes at least one of hydroxypropyl methylcellulose, polyvinyl alcohol, polysorbate, and starch ether.

5. The cement-based sound-absorbing board according to claim 1, characterized in that: The viscosity of the foam stabilizer is 20 to 100,000 mPa·s.

6. The method for preparing the cement-based sound-absorbing board according to any one of claims 1 to 5, characterized in that: The following steps are involved: The natural porous lightweight aggregate is immersed in a first waterproofing agent, taken out and dried to obtain a modified porous lightweight aggregate; The inorganic hydraulic cementitious material, the modified porous lightweight aggregate, part of the water, the water reducing agent, and the second waterproofing agent are mixed and stirred uniformly to obtain a slurry; After mixing the foaming agent, the remaining water and the foam stabilizer, the foam is generated by physical foaming to obtain a foam mixture; The slurry and the foam mixture are mixed to obtain a mixture, and the mixture is molded to obtain the cement-based sound-absorbing board.

7. The method according to claim 6, characterized in that The volume ratio of the foaming agent to the remaining water is 1:20-80, and / or the physical foaming includes at least one of high-speed shear stirring and foaming by a foaming machine.

8. Use of the cement-based sound-absorbing board according to any one of claims 1 to 5 in building sound insulation and noise reduction.

9. A facility characterized by The invention comprises the cement-based sound-absorbing board according to any one of claims 1 to 5.

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