Ground soundproofing mortar and method for its preparation

Abstract

The application relates to the technical field of ground mortar processing, in particular to a ground sound insulation mortar and a preparation method thereof. The ground sound insulation mortar is prepared from the following raw materials in parts by weight: cement 250-300 parts, aggregate 500-600 parts, nano filler 30-50 parts, rubber particles 150-200 parts, glass microbeads 80-100 parts, sepiolite 50-60 parts, cellulose 1-5 parts, fiber 6-15 parts, redispersible latex powder 10-15 parts and other auxiliaries 0.4-0.8 parts. The ground sound insulation mortar prepared by using the above formula has good sound insulation performance and strength, and has a long service life and is not prone to cracking.

Description

Technical Field

[0001] This application relates to the field of ground mortar processing technology, and in particular to a ground sound insulation mortar and its preparation method. Background Technology

[0002] With the increase in population and the development of modern technology, all kinds of buildings have begun to appear before people's eyes. The construction industry has also developed various sound insulation materials, such as sound-insulating mortar. When building high-rise buildings, in order to deal with serious noise problems, sound-insulating mortar is laid on each floor slab to isolate the noise between floors.

[0003] The main components of existing ground sound insulation mortar include cement, quartz sand, sound insulation filler, and high-quality additives. Among them, most sound insulation materials use rubber particles, mainly because rubber particles have good damping properties and can effectively absorb and isolate sound waves, thereby reducing the propagation of noise.

[0004] To improve sound insulation, the amount of rubber granules is often increased, sometimes reaching 40% of the total sound insulation mortar volume. However, due to the high flexibility of rubber granules, excessive amounts can weaken the overall strength of the mortar, leading to cracking over time and affecting its lifespan. Therefore, sound insulation mortars with a high rubber granule content are only suitable for buildings with short service lives. For residential buildings, shopping malls, and office buildings with long service lives, the amount of rubber granules should be limited to 10-25% of the total sound insulation mortar volume. This ensures the overall strength of the mortar while maintaining some sound insulation effect, but the actual sound insulation performance is significantly reduced, thus requiring improvement. Summary of the Invention

[0005] To address the issues that insufficient rubber granules lead to a significant reduction in sound insulation performance, while excessive rubber granules result in a decrease in the overall strength of the sound insulation mortar, this application provides a ground sound insulation mortar and its preparation method.

[0006] In the first aspect, this application provides a ground sound insulation mortar, which adopts the following technical solution: A type of sound-insulating mortar for flooring, the sound-insulating mortar for flooring being prepared from the following raw materials in parts by weight: 250-300 parts cement 500-600 parts of aggregate 30-50 parts of nanofiller 150-200 parts rubber granules 80-100 parts of glass microbeads 50-60 parts sepiolite 1-5 parts cellulose 6-15 parts fiber 10-15 parts redispersible latex powder Other additives: 0.4-0.8 parts.

[0007] By adopting the above technical solution, the prepared ground sound insulation mortar has good sound insulation performance and strength, and has a long service life and is not prone to cracking.

[0008] This application utilizes a combination of rubber particles, glass microspheres, and sepiolite to significantly improve the sound insulation effect of floor soundproofing mortar. Glass microspheres are hollow glass spheres; when sound waves propagate to the glass microsphere layer, they are reflected, refracted, and scattered between and within the microspheres, thus consuming sound energy and reducing sound transmission. Sepiolite is a porous mineral containing numerous tiny pores and channels. These pores and channels effectively absorb and scatter sound waves, thereby reducing sound transmission and propagation. The combined use of rubber particles to block sound waves, glass microspheres to refract and reflect sound waves, and sepiolite to absorb sound waves greatly enhances the sound insulation effect of the floor soundproofing mortar. Furthermore, both glass microspheres and sepiolite possess good strength, further increasing the strength of the soundproofing mortar, reducing the amount of rubber particles needed, and extending the service life of the soundproofing mortar.

[0009] Renewable dispersed latex powder can enhance the adhesion of rubber particles, glass microspheres, sepiolite, fibers, aggregates and nanofillers, increase the bonding strength of the sound insulation mortar after curing, increase its strength and extend its service life.

[0010] The aggregates, rubber particles, glass microspheres, and sepiolite used in this application have different particle sizes, resulting in pores in the sound-insulating mortar during solidification. These pores affect the strength of the sound-insulating mortar. Nanofillers have extremely high specific surface area and activity, which can fill the tiny pores in the sound-insulating mortar, increasing the mortar's density and strength, and ensuring sound insulation performance.

[0011] Fibers can be evenly dispersed in mortar, improving its deformability and reducing its brittleness, thus giving it better impact and seismic resistance. Furthermore, fibers can enhance the toughness and crack resistance of mortar, increasing its durability and service life.

[0012] Cellulose can be used as a thickener to increase the viscosity of sound insulation mortar, thereby improving its fluidity and workability.

[0013] Other additives may include air-entraining agents and / or water-reducing agents. Air-entraining agents effectively alleviate the internal stress generated in the sound-insulating mortar during freeze-thaw cycles, preventing cracking and peeling, thereby improving the durability and service life of the sound-insulating mortar. Water-reducing agents can improve the fluidity of the sound-insulating mortar, making it easier to apply and pour.

[0014] Preferably, the rubber particles are modified rubber particles, prepared by the following method: A: Mix rubber granules and potassium permanganate solution, heat to 40-50℃, stir at high speed for 3-4 hours to obtain oxidized rubber granules; B: Stir graphite and silane coupling agent, then add oxidized rubber granules and stir, then mix at 50-60℃, then pulverize again to obtain modified rubber granules.

[0015] By adopting the above technical solution, the modified rubber particles prepared have good strength, which can further improve the strength and sound insulation effect of the ground sound insulation mortar. Graphite can improve the strength of rubber particles without affecting the sound insulation effect of the mortar. However, graphite is a material that is prone to agglomeration. When mixed with rubber particles, it tends to agglomerate, resulting in uneven dispersion in the rubber particle system and poor reinforcement effect.

[0016] Rubber granules typically possess active functional groups on their surface, such as hydroxyl and carboxyl groups. These groups can be oxidized by potassium permanganate, thereby altering the surface properties of the rubber granules and promoting their bonding with graphite. Surface modification of graphite, resulting in silanization, allows for uniform dispersion within the rubber granule system. Simultaneously, the silanized graphite reacts with the oxidized rubber granules, further enhancing its compatibility and interfacial bonding with the rubber matrix, ultimately increasing the strength of the rubber granules without compromising their sound insulation properties.

[0017] Preferably, the raw materials used to prepare the modified rubber particles are in the following weight proportions: 40-60 parts of rubber granules 80-100 parts of potassium permanganate solution 10-15 parts graphite 2-3 parts of silane coupling agent.

[0018] By adopting the above technical solution, the amount of raw materials used to prepare modified rubber particles is optimized, which promotes the oxidation of rubber particles, prevents excessive oxidation of rubber particles, and avoids affecting the sound insulation effect of rubber particles, the reaction between graphite and silane coupling agent, and the reaction between silane graphite and rubber particles, thereby improving the bonding force between graphite and rubber particles, and improving the strength and sound insulation effect of rubber particles.

[0019] Preferably, the potassium permanganate solution has a mass fraction of 10-15%.

[0020] The above technical solution optimizes the concentration of the potassium permanganate solution, resulting in a moderate degree of oxidation of the rubber granules, appropriately increasing their hardness without hardening them in the soundproofing enclosure. If the potassium permanganate solution concentration is too high, excessive oxidation will cause the chemical bonds within the rubber granules to break, leading to cracks and hindering their use. If the potassium permanganate solution concentration is too low, it will not increase the hardness of the rubber granules.

[0021] Preferably, the glass microspheres have an average particle size of 50-120 micrometers, the rubber particles have an average particle size of 0.1-1 mm, and the sepiolite has an average particle size of 200-500 micrometers.

[0022] By adopting the above technical solution, the average particle size of glass microspheres, rubber particles and sepiolite is optimized to form a good gradation, which further improves the absorption, refraction and blocking effect of sound waves, thus improving the sound insulation effect of the ground sound insulation mortar.

[0023] Preferably, the cellulose includes at least one of methylcellulose, hydroxypropyl methylcellulose, and hydroxyethyl methylcellulose.

[0024] By adopting the above technical solution, the viscosity of the ground sound insulation mortar is increased. This application adds aggregates, nanofillers, rubber particles, sepiolite, and glass microspheres, which reduces the viscosity of the ground sound insulation mortar, making it less suitable for construction. The addition of cellulose increases the viscosity of the ground sound insulation mortar, thus facilitating its construction.

[0025] Preferably, the aggregate comprises medium sand and fine sand, wherein the weight parts of medium sand are 200-250 parts and the weight parts of fine sand are 300-350 parts.

[0026] By adopting the above technical solutions, the type of aggregate is optimized, thereby improving the compressive strength of the sound-insulating mortar. Fine sand particles are finer and can fill the gaps between medium sand particles, making the mortar more compact and uniform. Medium sand particles are larger and can fill larger gaps, forming a strong skeleton. The combined use of both improves the compressive strength and service life of the sound-insulating mortar.

[0027] Preferably, the fibers include wood fibers and PP fibers, with the wood fibers comprising 5-10 parts by weight and the PP fibers comprising 1-5 parts by weight.

[0028] By adopting the above technical solutions, the sound insulation effect and compressive strength of the ground sound insulation mortar are further improved. Wood fibers can be evenly dispersed in the mortar, forming a three-dimensional structure, effectively improving the mortar's compressive, tensile, and shear strength. PP fibers can also form a three-dimensional network structure in the mortar, increasing its density and giving it better durability and stability. The combined use of these two technologies further extends the service life of the ground vibration damping and sound insulation. The three-dimensional structure can further slow down the transmission of sound waves, increasing the sound insulation effect.

[0029] Preferably, the nanofiller includes at least one of nano-silica, nano-calcium carbonate, nano-ceramic powder, nano-metal oxide, and nano-clay.

[0030] The aforementioned nanofillers have excellent reinforcing and filling effects, further improving the filling of micropores in sound insulation mortar and increasing the density and strength of the mortar.

[0031] Secondly, this application provides a method for preparing sound-insulating mortar for the ground, which adopts the following technical solution: A method for preparing sound-insulating mortar for the ground includes the following preparation steps: Cement, aggregate, nanofiller, rubber particles, glass microspheres, sepiolite, cellulose, fiber, redispersible latex powder and other additives are mixed according to weight to obtain ground sound insulation mortar.

[0032] The ground vibration-damping mortar prepared by adopting the above technical solution has good sound insulation and seismic resistance, as well as good strength and can be used for a long time. When using it, the ground vibration-damping mortar should be mixed with water in a specific ratio as needed.

[0033] In summary, this application has the following beneficial effects: 1. This application prepares a sound insulation mortar for the ground by mixing cement, aggregate, nanofiller, rubber particles, glass microspheres, sepiolite, cellulose, fiber, redispersible latex powder and other additives. This can improve the sound insulation effect of the sound insulation mortar, increase its strength, and extend its service life.

[0034] 2. In this application, the rubber particles are first oxidized using potassium permanganate solution to obtain oxidized rubber particles, which appropriately increases the strength of the rubber particles. Then, graphitized silanized graphite is mixed with the oxidized rubber particles to obtain modified rubber particles, thereby increasing the strength of the rubber particles without affecting the sound insulation effect of the rubber. Detailed Implementation Example

[0035] All experimental materials used in this application are commercially available.

[0036] Example 1 A type of sound-insulating mortar for flooring is prepared by the following method: The following ingredients are mixed to obtain sound-insulating mortar for the ground: 25 kg of cement, aggregate (20 kg of medium sand and 30 kg of fine sand), 3 kg of nanofiller (silica), 15 kg of rubber particles, 8 kg of glass microspheres, 5 kg of sepiolite, 0.1 kg of cellulose (methylcellulose), 0.6 kg of fiber (wood fiber), 1 kg of redispersible latex powder, 0.01 kg of air-entraining agent (sodium octadecylbenzene sulfonate), and 0.03 kg of water-reducing agent (sodium lignosulfonate).

[0037] The rubber granules are environmentally friendly EPDM rubber granules, with an average particle size of 0.1 mm, glass microspheres with an average particle size of 20 micrometers, and sepiolite with an average particle size of 200 micrometers.

[0038] The redispersible latex powder is VAE redispersible latex powder 1016.

[0039] The difference between Examples 2-3 and Example 1 lies in the types and amounts of some raw materials used in the preparation of the sound-insulating mortar. Specific differences are shown in Table 1. Table 1. Raw material types and dosages for preparing sound-insulating mortar in Examples 1-3 The tensile strength of the wood fiber is 2000 MPa, and the elongation at break is 3%.

[0040] The tensile strength of PP fiber is 400 MPa and the elongation at break is 15%.

[0041] The tensile strength of the glass fiber is 600 MPa.

[0042] Example 4 A type of sound-insulating mortar for the ground, the difference between this embodiment and Embodiment 1 is that the rubber particles are modified rubber particles, prepared by the following method: A: Mix 20 kg of rubber granules with 40 kg of 15% potassium permanganate solution, heat to 40°C, stir at high speed for 3 h to obtain oxidized rubber granules. B: Stir 5 kg of graphite and 1 kg of silane coupling agent (3-mercaptopropyltrimethoxysilane), then add oxidized rubber particles and stir, then mix them together at a mixing temperature of 50°C, and then pulverize them again to obtain modified rubber particles.

[0043] The rubber granules are environmentally friendly EPDM rubber granules.

[0044] The difference between Examples 5-6 and Example 4 lies in the types and amounts of some raw materials and parameters used in the preparation of the modified rubber granules. Specific differences are shown in Table 2. Table 2. Raw material types, dosages, and parameters for preparing modified rubber granules in Examples 4-6. Example 7 A ground sound insulation mortar, the difference between this embodiment and embodiment 4 is that, in step A, a 15% sodium hydroxide solution is used instead of a potassium permanganate solution, while the types, amounts and experimental parameters of the remaining raw materials are the same as in embodiment 4.

[0045] Example 8 A ground sound insulation mortar. The difference between this embodiment and embodiment 4 is that silicon dioxide is used instead of graphite in step A. The types, amounts and experimental parameters of the other raw materials are the same as in embodiment 4.

[0046] Example 9 A ground sound insulation mortar, the difference between this embodiment and embodiment 1 is that the fibers include wood fibers and PP fibers, the weight of wood fibers is 0.5Kg and the weight of PP fibers is 0.1Kg, and the types, amounts and experimental parameters of the other raw materials are the same as those in embodiment 1.

[0047] Example 10 A ground sound insulation mortar, the difference between this embodiment and embodiment 1 is that the fibers include wood fibers and PP fibers, the weight of wood fibers is 1Kg and the weight of PP fibers is 0.5Kg, the types and amounts of other raw materials and experimental parameters are the same as in embodiment 1.

[0048] Comparative Example Comparative Example 1 A ground sound insulation mortar, the difference between this embodiment and embodiment 1 is that glass microspheres are replaced with an equal amount of rubber particles, while the types, amounts and experimental parameters of the other raw materials are the same as in embodiment 1.

[0049] Comparative Example 2 A ground sound insulation mortar, the difference between this embodiment and embodiment 1 is that sepiolite is replaced with an equal amount of rubber particles, while the types, amounts and experimental parameters of the other raw materials are the same as in embodiment 1.

[0050] Comparative Example 3 A ground sound insulation mortar, the difference between this embodiment and embodiment 1 is that glass microspheres and sepiolite are replaced with an equal amount of rubber particles, while the types, amounts and experimental parameters of the other raw materials are the same as in embodiment 1.

[0051] Comparative Example 4 A ground sound insulation mortar, the difference between this embodiment and embodiment 1 is that the nano filler is replaced with nano filler with an average particle size of 1mm, while the types, amounts and experimental parameters of the other raw materials are the same as in embodiment 1.

[0052] Comparative Example 5 A ground sound insulation mortar, the difference between this embodiment and embodiment 1 is that the wood fiber is replaced with calcium carbonate, while the types, amounts and experimental parameters of the other raw materials are the same as those in embodiment 1.

[0053] Performance testing The ground sound insulation mortars prepared in Examples 1-10 and Comparative Examples 1-5 were subjected to noise testing, compressive strength testing, and ultraviolet aging testing.

[0054] Detection methods / test methods Before the experiment, the ground sound insulation mortar prepared in Examples 1-10 and Comparative Examples 1-5 was mixed with water to form mortar, and then the mortar was prepared into samples before the experiment was conducted.

[0055] UV aging performance test: The test was then conducted in a UV oven with a UV intensity of 1500 μW / cm, a test temperature of 60℃, and a time of 2400 h. The noise and compressive strength were tested before and after aging.

[0056] Noise testing: Tests were conducted according to GB / T19889.8-2006-ISO140-8:1997 "Acoustics in buildings and building sound insulation measurement - Part 8: Laboratory measurement of impact sound reduction of heavy standard floor slab cladding", and then the weighted and standardized impact sound pressure level (L) was evaluated according to GB / T50121-2005 "Standard for Evaluation of Building Sound Insulation". n,W .

[0057] Compressive strength: Samples measuring 40mm × 40mm × 160mm were formed after 28 days of constant temperature and humidity curing at 23℃ and 60% relative humidity. Before testing, a uniform load was applied at a rate of 2400N / s ± 200N / s, and the compressive strength was tested. An aging test was then conducted, followed by a second compressive strength test. The test data are shown in Table 3. Table 3. Experimental data of Examples 1-10 and Comparative Examples 1-5 As can be seen from Examples 1-10 and Comparative Examples 1-5 and Table 3, the ground earthquake-resistant and sound-insulating mortar prepared by the formulation of this application has good sound insulation effect and strength, and has a long service life.

[0058] Comparing Example 1 and Comparative Example 1, the weighted normalized impact sound pressure level L in Comparative Example 1... n,W After aging tests, the compressive strength increased by 6.1 dB, but was less than that of Example 1, and decreased by 0.7 MPa after aging tests. Comparing Example 1 and Comparative Example 2, the weighted normalized impact sound pressure level L in Comparative Example 2... n,W After aging tests, the compressive strength increased by 8.5 dB, but was less than that of Example 1, and decreased by 1.1 MPa after aging tests. Comparing Example 1 and Comparative Example 3, the weighted normalized impact sound pressure level L in Comparative Example 3... n,W After aging tests, the compressive strength increased by 9.7 dB, but was less than that of Example 1, and decreased by 1.3 MPa after aging tests. Weighted normalized impact sound pressure level L in Example 1 n,W After aging tests, the compressive strength increased by 3.4 dB, while the compressive strength decreased by 0.3 MPa. This indicates that the compressive strength of Comparative Examples 1-3 is poor, and the weighted normalized impact sound pressure level L after aging tests... n,W The significant changes in the compressive strength indicate that by using rubber particles, glass microspheres, and sepiolite in a specific ratio, this application can further improve the compressive strength and service life of the ground earthquake-resistant sound insulation mortar, while also ensuring the sound insulation effect of the ground earthquake-resistant sound insulation mortar.

[0059] Comparing Example 1 and Comparative Example 4, the weighted normalized impact sound pressure level L in Comparative Example 4... n,W The sound insulation effect, compressive strength and service life of the ground earthquake-resistant sound insulation mortar can be further improved by using nano-level fillers in combination with other raw materials. The sound insulation effect, compressive strength and service life of the ground earthquake-resistant sound insulation mortar are higher than those of Example 1, and the compressive strength is lower than that of Example 1, and the compressive strength is reduced by 1.5MPa after aging test.

[0060] Comparing Example 1 and Comparative Example 5, the weighted normalized impact sound pressure level L in Comparative Example 5... n,W The sound insulation effect, compressive strength and service life of the ground earthquake-resistant sound insulation mortar can be further improved by using fibers together with other raw materials. The sound insulation effect, compressive strength and service life of the ground earthquake-resistant sound insulation mortar are higher than those of Example 1 and the compressive strength is lower than that of Example 1 and the compressive strength is reduced by 1.0 MPa after aging test.

[0061] Compared with Example 4, Example 4 shows that the weighted normalized impact sound pressure level L n,W Compared to Example 1, the weighted normalized impact sound pressure level L in Example 7 increased by 0.5 dB after aging test; the compressive strength was greater than that in Example 1, and the compressive strength decreased by 0.2 MPa after aging test; compared to Example 7, Example 4 showed an increase of 0.5 dB after aging test.n,W The strength was higher than that of Example 4, increasing by 4.5 dB after aging test; the compressive strength was lower than that of Example 4, and the compressive strength decreased by 0.9 MPa after aging test. Compared with Example 8, Example 4 shows that the weighted normalized impact sound pressure level L in Example 8 is different. n,W The sound insulation performance was higher than that of Example 4, with an increase of 3.2 dB after aging tests; however, the compressive strength was lower than that of Example 4, and the compressive strength decreased by 0.6 MPa after aging tests. Examples 1, 4, and 7-8 demonstrate that the modified rubber particles prepared according to this application can further improve the sound insulation effect, compressive strength, and service life of the ground seismic sound insulation mortar.

[0062] Comparing Example 1 with Examples 9-10, the weighted normalized impact sound pressure level L in Examples 9-10 n,W The sound insulation effect, compressive strength and service life of the ground anti-seismic sound insulation mortar can be improved by using both wood fiber and PP fiber, which is lower than that of Example 1 and increased by about 2 dB after aging test.

[0063] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A type of sound-insulating mortar for flooring, characterized in that, The ground sound insulation mortar is prepared from the following raw materials in parts by weight: 250-300 parts cement 500-600 parts of aggregate 30-50 parts of nanofiller 150-200 parts modified rubber granules 80-100 parts of glass microbeads 50-60 parts sepiolite 1-5 parts cellulose 6-15 parts fiber 10-15 parts redispersible latex powder Other additives: 0.4-0.8 parts; Other additives include air-entraining agents and water-reducing agents; The modified rubber particles are prepared by the following method: A: Mix rubber granules and potassium permanganate solution, heat to 40-50℃, stir at high speed for 3-4 hours to obtain oxidized rubber granules; B: Stir the graphite and silane coupling agent, then add the oxidized rubber particles and stir again, then mix them at a temperature of 50-60℃, and then pulverize them again to obtain modified rubber particles; The raw materials used to prepare the modified rubber granules are as follows by weight: 40-60 parts of rubber granules 80-100 parts of potassium permanganate solution 10-15 parts graphite 2-3 parts of silane coupling agent; The glass microspheres have an average particle size of 50-120 micrometers, the rubber particles have an average particle size of 0.1-1 mm, and the sepiolite has an average particle size of 200-500 micrometers. The cellulose includes at least one of methylcellulose, hydroxypropyl methylcellulose, and hydroxyethyl methylcellulose; The aggregate comprises medium sand and fine sand, wherein the weight parts of medium sand are 200-250 parts and the weight parts of fine sand are 300-350 parts; The nanofiller includes at least one of nano-silica, nano-calcium carbonate, nano-ceramic powder, nano-metal oxide, and nano-clay.

2. The sound-insulating mortar for ground according to claim 1, characterized in that: The potassium permanganate solution has a mass fraction of 10-15%.

3. A method for preparing the ground sound insulation mortar as described in any one of claims 1-2, characterized in that, The preparation steps include the following: Cement, aggregate, nanofiller, rubber particles, glass microspheres, sepiolite, cellulose, fiber, redispersible latex powder, air-entraining agent and water-reducing agent are mixed according to weight to obtain ground sound insulation mortar.

Images