Vibration-absorbing and sound-insulating mortar composition, vibration-absorbing and sound-insulating mortar, and preparation method and application thereof

Abstract

The present invention relates to the field of building sound insulation technology, and discloses a vibration-damping and sound-insulating mortar composition, a vibration-damping and sound-insulating mortar, and a preparation method and application thereof. The mortar composition contains the following components, each stored independently or in combination: cement, a sound-insulating material, an inorganic filler, a cellulose ether, a water-reducing agent, PP fiber, sodium percarbonate, manganese dioxide, and a retarder. The vibration-damping and sound-insulating mortar provided by the present invention has high strength and can significantly improve impact sound insulation performance when a small amount of sound-insulating material is added. It also has good sound absorption effects. The preparation method is simple and easy, and can be widely used in the field of building materials.

Description

Technical Field

[0001] The present invention relates to the technical field of building sound insulation, and in particular to a vibration-damping and sound-insulating mortar composition, a vibration-damping and sound-insulating mortar, and a preparation method and application thereof. Background Art

[0002] As people's living standards improve, they are paying more and more attention to the sound insulation performance of buildings. According to the national building sound insulation standard "Civil Building Sound Insulation Standard" GB 50118-2010, walls and floors must be able to effectively resist the transmission of sound through air vibration and impact of objects.

[0003] The energy of solid-borne sound is minimally attenuated in traditional building materials, propagating faster than through air and over longer distances. Therefore, while residents on lower floors generally cannot hear the voices of those above, the sounds of upper-floor residents lifting tables, children running, and the clacking of heels can significantly impact those below. While continuous, thick, and hard concrete floors provide excellent airborne sound insulation, they are less effective against impact noise.

[0004] Sound insulation mortar mainly uses shock-absorbing materials, adjusts the rigidity modulus, increases the conversion rate of mechanical energy into thermal energy, greatly reduces the transmission of noise, thereby achieving good sound insulation effect and improving the living environment of residents.

[0005] CN114455977A discloses a premixed mortar, which includes the following raw materials in parts by weight: 35-45 parts of quartz sand, 20-30 parts of cement, 10-20 parts of river sand, 0.05-0.15 parts of anti-cracking agent, 0.1-0.5 parts of water-retaining agent, 0.2-0.8 parts of water-reducing agent, 1-3 parts of latex powder, and 20-30 parts of sound-absorbing material; the sound-absorbing material is specifically made by extruding and granulating a microporous material, a foaming agent, a dispersant, and polyethylene through an extrusion device.

[0006] However, although this technical solution solves the problem of sound insulation and sound absorption very well, the composition of the sound-absorbing material is complex, the preparation process is cumbersome, and the amount of sound-absorbing material used is large. Although the sound insulation performance is good, the large amount of sound-absorbing material added will greatly reduce the mortar strength. Summary of the Invention

[0007] The purpose of the present invention is to solve the problem that the existing sound insulation mortar cannot take into account both sound insulation performance and mortar strength.

[0008] In order to achieve the above-mentioned object, the first aspect of the present invention provides a vibration-damping and sound-insulating mortar composition, which contains the following components, which are stored separately or in combination: cement, sound insulation material, inorganic filler, cellulose ether, water-reducing agent, PP fiber, sodium percarbonate, manganese dioxide, and retarder;

[0009] Based on the total mass of the mortar composition, the content of the cement is 37-49wt%, the content of the sound insulation material is 6-20wt%, the content of the inorganic filler is 35-50wt%, the content of the cellulose ether is 0.08-0.22wt%, the content of the water reducer is 0.03-0.1wt%, the content of the PP fiber is 0.06-0.15wt%, the content of the sodium percarbonate is 0.2-1.5wt%, the content of the manganese dioxide is 0.05-0.9wt%, and the content of the retarder is 0.01-0.04wt%;

[0010] The cement is a combination of Portland cement and rapid hardening cement in a mass ratio of 1:0.04-0.12;

[0011] The sound insulation material is damping rubber particles with an average particle size of 0.15mm-0.85mm;

[0012] The mass ratio of the sodium percarbonate to the manganese dioxide is 1:0.25-0.65.

[0013] The second aspect of the present invention provides a method for preparing vibration-damping and sound-insulating mortar, which comprises: mixing the components in the mortar composition described in the first aspect, and the mixing conditions at least meet the following conditions: stirring speed of 300-400 rpm, temperature of 5-40°C, and time of 2-3 min.

[0014] The third aspect of the present invention provides a vibration-damping and sound-insulating mortar prepared by the method described in the second aspect.

[0015] The fourth aspect of the present invention provides the use of the shock-absorbing and sound-insulating mortar described in the third aspect in the field of building sound insulation.

[0016] Compared with the existing sound insulation mortar technology, the present invention has the following beneficial effects:

[0017] The shock-absorbing and sound-insulating mortar provided by the present invention has the characteristics of high strength, and can significantly improve the impact sound insulation performance when a small amount of sound insulation material is added, while also having a good sound absorption effect.

[0018] The preparation method of the vibration-damping and sound-insulating mortar provided by the present invention is simple and easy to implement, and has great application prospects. DETAILED DESCRIPTION

[0019] The endpoints of the ranges and any values ​​disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoints of each range, the endpoints of each range and individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered to be specifically disclosed herein.

[0020] It should be noted that, in various aspects of the present invention, for the same components in various aspects, the present invention is only described once in one aspect without repeated description, which should not be understood by those skilled in the art as a limitation of the present invention.

[0021] As mentioned above, the first aspect of the present invention provides a vibration-damping and sound-insulating mortar composition, characterized in that the mortar composition contains the following components, which are stored separately or in combination: cement, sound insulation material, inorganic filler, cellulose ether, water-reducing agent, PP fiber, sodium percarbonate, manganese dioxide, and retarder;

[0022] Based on the total mass of the mortar composition, the content of the cement is 37-49wt%, the content of the sound insulation material is 6-20wt%, the content of the inorganic filler is 35-50wt%, the content of the cellulose ether is 0.08-0.22wt%, the content of the water reducer is 0.03-0.1wt%, the content of the PP fiber is 0.06-0.15wt%, the content of the sodium percarbonate is 0.2-1.5wt%, the content of the manganese dioxide is 0.05-0.9wt%, and the content of the retarder is 0.01-0.04wt%;

[0023] The cement is a combination of Portland cement and rapid hardening cement in a mass ratio of 1:0.04-0.12;

[0024] The sound insulation material is damping rubber particles with an average particle size of 0.15mm-0.85mm;

[0025] The mass ratio of the sodium percarbonate to the manganese dioxide is 1:0.25-0.65.

[0026] During the research process, the inventors of the present invention discovered that by compounding silicate cement and rapid-hardening cement in a mass ratio of 1:0.04-0.12 and using damping rubber particles of a specific particle size, the resulting composition can be used to prepare a shock-absorbing and sound-isolating mortar with better compressive strength and sound insulation effect.

[0027] Preferably, the average particle size of the damping rubber particles is 0.25 mm to 0.85 mm. The inventors have found that under this preferred embodiment, the goal of improving the sound insulation effect of the mortar can be perfectly achieved under the premise of ensuring strength.

[0028] Preferably, the mass ratio of the sodium percarbonate to the manganese dioxide is 1:0.5-0.65.

[0029] The combined effect of sodium percarbonate and manganese dioxide in the present invention effectively reduces the amount of sound insulation material required, while providing excellent vibration and sound insulation performance, while also ensuring high strength. Combined with the damping rubber particles, this improves both vibration and sound insulation performance while also providing excellent sound absorption. However, the inventors have discovered that controlling the sodium percarbonate content in the composition to 0.2-1.5wt% and the manganese dioxide content to 0.05-0.9wt%, combined with the other technical features of the technical solution provided by the present invention, can improve the sound insulation effect of the mortar while maintaining strength.

[0030] According to a particularly preferred embodiment of the present invention, the silicate cement is selected from at least one of P·O42.5 cement, P·O 42.5R cement, P·O 52.5 cement, and P·O 52.5R cement.

[0031] According to a particularly preferred embodiment of the present invention, the rapid hardening cement is selected from at least one of sulphoaluminium cement and high alumina cement.

[0032] Preferably, the cellulose ether is selected from at least one of hydroxypropyl methylcellulose ether and hydroxyethyl cellulose ether.

[0033] In some embodiments of the present invention, preferably, the cellulose ether has a viscosity of 20,000-100,000 mPa.s at a temperature of 25°C.

[0034] Preferably, the water reducer is selected from at least one of polycarboxylic acid water reducer and naphthalene water reducer.

[0035] According to a preferred embodiment, the retarder is selected from at least one of citric acid, sodium gluconate and tartaric acid.

[0036] Preferably, the inorganic filler is selected from at least one of machine-made sand, quartz sand and river sand.

[0037] As mentioned above, the second aspect of the present invention provides a method for preparing shock-absorbing and sound-insulating mortar, which comprises: mixing the components in the mortar composition described in the first aspect, and the mixing conditions at least meet the following conditions: stirring speed of 300-400rpm, temperature of 5-40°C, and time of 2-3min.

[0038] The present invention has no special requirements for the specific operation of the mixing and the order of adding the components during the mixing process. The mixing can be carried out by methods known in the art, or the components in the mortar composition can be mixed in any order of adding the components. The present invention will not go into details here, and those skilled in the art should not understand this as a limitation of the present invention.

[0039] Preferably, the mixing operation can be carried out in a dry mortar mixer.

[0040] As mentioned above, the third aspect of the present invention provides a vibration-damping and sound-isolating mortar prepared by the method described in the second aspect.

[0041] As mentioned above, the fourth aspect of the present invention provides the application of the shock-absorbing and sound-insulating mortar described in the third aspect in the field of building sound insulation.

[0042] The present invention will be described in detail below through examples.

[0043] In the following examples, unless otherwise specified, the experimental instruments and raw materials involved are commercially available.

[0044] instrument

[0045] The dry mortar mixer, model MS.11, was purchased from Motech Metis (China) Technology Co., Ltd.

[0046] raw material

[0047] Portland cement: P·O 42.5 cement, brand Conch, purchased from Conch Cement Co., Ltd.

[0048] Rapid hardening cement: sulphoaluminium cement, brand name Polar Bear, purchased from Tianjin Polar Bear Building Materials Co., Ltd.;

[0049] Rapid hardening cement: high alumina cement, brand Yiruishi, purchased from Yiruishi Aluminate Co., Ltd.

[0050] Sound insulation material: Damping rubber particles I, with an average particle size of 0.85 mm, purchased from Sihui Hongda Rubber Recycling Resources Technology Co., Ltd.

[0051] Sound insulation material: Damping rubber particles II, average particle size 0.25 mm, purchased from Sihui Hongda Rubber Recycling Resources Technology Co., Ltd.

[0052] Sound insulation material: Damping rubber particles III, average particle size 0.15 mm, purchased from Sihui Hongda Rubber Recycling Resources Technology Co., Ltd.

[0053] Sound insulation material: Damping rubber particles IV, average particle size 4 mm, purchased from Sihui Hongda Rubber Recycling Resources Technology Co., Ltd.

[0054] Sound insulation material: Damping rubber particles V, with an average particle size of 0.106 mm, purchased from Sihui Hongda Rubber Recycling Resources Technology Co., Ltd.

[0055] Sound insulation material: Damping rubber particles VI, with an average particle size of 0.18 mm, purchased from Sihui Hongda Rubber Recycling Resources Technology Co., Ltd.

[0056] Inorganic filler: machine-made sand, particle size 0-1.18 mm, purchased from Ji'an Zoomlion New Material Technology Co., Ltd.

[0057] Inorganic filler: quartz sand, particle size 0.38-0.85 mm, purchased from Nanlian Environmental Technology Co., Ltd.

[0058] Inorganic filler: river sand, particle size 0.212-0.38 mm, purchased from Jiugu Building Materials Co., Ltd.

[0059] Cellulose ether: Hydroxypropyl methylcellulose ether, with a viscosity of 80,000 mPa.s at 25°C, purchased from Northern Tianpu Cellulose Co., Ltd.

[0060] Cellulose ether: Hydroxyethyl cellulose ether, with a viscosity of 30,000 mPa.s at 25°C, purchased from Shanghai Huiguang Fine Chemical Co., Ltd.

[0061] Water reducer: polycarboxylate water reducer, model 540P, purchased from Sika (China) Co., Ltd.

[0062] Water reducer: Naphthalene-based water reducer, model FDN-05, purchased from Zhejiang Jisheng Chemical Building Materials Co., Ltd.

[0063] PP fiber: polypropylene (PP) fiber, average length 6 mm, purchased from Guangzhou Jiantubao Building Materials Co., Ltd.

[0064] Sodium percarbonate: Analytical grade (AR) purchased from Tianjin Dingshengxin Chemical Co., Ltd.

[0065] Manganese dioxide: Analytical grade (AR) was purchased from Maoming Xiongda Chemical Co., Ltd.

[0066] Retarder: citric acid, purchased from Shanghai Yingshan New Material Technology Co., Ltd.

[0067] Retarder: tartaric acid, purchased from Shanghai Yingshan New Material Technology Co., Ltd.

[0068] Unless otherwise specified, 1 wt% means 100 g.

[0069] In the following examples, the performance testing methods involved are as follows:

[0070] The compressive strength performance is tested according to the cube compressive strength test method in JGJ / T 70-2009 "Standard for Test Methods of Basic Properties of Building Mortar";

[0071] Impact sound insulation improvement performance is tested in accordance with GB / T 19889.6-2005 "Standard for Laboratory Measurement of Impact Sound Insulation of Floor Slabs";

[0072] The airborne sound insulation performance is tested in accordance with GB / T 19889.3-2005 "Standard for Laboratory Measurement of Airborne Sound Insulation of Building Components";

[0073] The tensile bond strength performance is tested according to the tensile bond strength test method in JGJ / T 70-2009 "Standard for Test Methods for Basic Properties of Building Mortar".

[0074] Example 1

[0075] This example is used to illustrate that the vibration-damping and sound-insulating mortar composition of the present invention is prepared according to the formula and process parameters in Table 1 and the method described below.

[0076] The method for preparing the vibration-damping and sound-insulating mortar comprises the following steps:

[0077] Cement, sound insulation material, inorganic filler, cellulose ether, water reducer, PP fiber, sodium percarbonate, manganese dioxide, and retarder are placed in a mixer and mixed to obtain a vibration-damping and sound-insulating mortar S1.

[0078] Unless otherwise specified, the remaining examples were carried out using the same process as Example 1, except that the formula of the vibration-damping and sound-insulating mortar composition used was different, see Table 1 for details; the comparative examples were carried out using the same process as Example 1, except that the formula of the vibration-damping and sound-insulating mortar composition used was different, see Table 2 for details.

[0079] Table 1

[0080]

[0081]

[0082] Table 2

[0083]

[0084]

[0085] Test Case

[0086] The performance of the vibration-damping and sound-insulating mortars obtained in each embodiment and comparative example was measured using the aforementioned test method. The specific results are shown in Table 3.

[0087] Table 3

[0088] project Example 1 Example 2 Example 3 Example 4 Example 5 Compressive strength / MPa 10.6 7.8 8.6 12.2 11.2 Impact sound insulation improvement / dB 22 15 18 12 13 Airborne sound insulation / dB 35 32 25 30 28 Tensile bond strength / MPa 0.25 0.32 0.33 0.35 0.33

[0089] Table 3 (Continued)

[0090] project Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Compressive strength / MPa 5.4 12.5 14.4 3.2 6.4 Impact sound insulation improvement / dB 24 8 6 25 16 Airborne sound insulation / dB 24 22 26 32 24 Tensile bond strength / MPa 0.19 0.28 0.36 0.16 0.22

[0091] From the above results, it can be seen that the shock-absorbing and sound-insulating mortar prepared by the shock-absorbing and sound-insulating mortar composition provided by the present invention has high strength. When the amount of sound insulation material added is small, it can better improve the impact sound insulation performance, and at the same time has a good sound absorption effect, and the preparation method is simple and easy.

[0092] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited thereto. Within the technical concept of the present invention, various simple variations of the technical solution of the present invention may be made, including combining the various technical features in any other appropriate manner. These simple variations and combinations should also be regarded as disclosed in the present invention and fall within the scope of protection of the present invention.

Claims

1. A vibration-damping and sound-insulating mortar composition, characterized in that: The mortar composition contains the following components which are stored separately or in combination: cement, sound insulation material, inorganic filler, cellulose ether, water reducing agent, PP fiber, sodium percarbonate, manganese dioxide, and retarder; Based on the total mass of the mortar composition, the content of the cement is 37-49wt%, the content of the sound insulation material is 6-16wt%, the content of the inorganic filler is 35-50wt%, the content of the cellulose ether is 0.08-0.22wt%, the content of the water reducer is 0.03-0.1wt%, the content of the PP fiber is 0.06-0.15wt%, the content of the sodium percarbonate is 0.2-1.5wt%, the content of the manganese dioxide is 0.05-0.9wt%, and the content of the retarder is 0.01-0.04wt%. The cement is a combination of Portland cement and rapid hardening cement in a mass ratio of 1:0.04-0.12; The sound insulation material is damping rubber particles with an average particle size of 0.15mm-0.85mm; The mass ratio of the sodium percarbonate to the manganese dioxide is 1:0.5-0.

65.

2. The mortar composition according to claim 1, characterized in that The average particle size of the damping rubber particles is 0.25 mm to 0.85 mm.

3. The mortar composition according to claim 1 or 2, characterized in that The silicate cement is at least one selected from P·O42.5 cement, P·O 42.5R cement, P·O 52.5 cement, and P·O 52.5R cement; and / or, The rapid hardening cement is selected from at least one of sulphoaluminium cement and high alumina cement.

4. The mortar composition according to claim 1 or 2, characterized in that The cellulose ether is selected from at least one of hydroxypropyl methyl cellulose ether and hydroxyethyl cellulose ether; and / or, The cellulose ether has a viscosity of 20,000-100,000 mPa.s at a temperature of 25°C.

5. The mortar composition according to claim 1 or 2, characterized in that The water reducer is selected from at least one of a polycarboxylic acid water reducer and a naphthalene water reducer.

6. The mortar composition according to claim 1 or 2, characterized in that The retarder is selected from at least one of citric acid, sodium gluconate and tartaric acid; and / or, The inorganic filler is selected from at least one of machine-made sand, quartz sand and river sand.

7. A method for preparing vibration-damping and sound-insulating mortar, characterized in that: The method comprises: mixing the components of the mortar composition according to any one of claims 1 to 6, wherein the mixing conditions at least meet the following conditions: a stirring speed of 300-400 rpm, a temperature of 5-40° C., and a mixing time of 2-3 min.

8. The vibration-damping and sound-insulating mortar prepared by the method according to claim 7.

9. Use of the shock-absorbing and sound-insulating mortar according to claim 8 in the field of building sound insulation.

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