Two-component floor sound insulation coating and preparation method thereof

Abstract

The invention discloses a two-component floor sound insulation coating and a preparation method thereof. The two-component floor sound insulation coating comprises a liquid material component and a powder material component, the liquid material component comprises a polymer emulsion, water, a thickening agent and a preservative; the powder component comprises Portland cement, an elastic filler, modified heavy calcium carbonate, modified floating beads, an aluminum powder foaming agent, a water reducing agent and a retarder. The two-component floor sound insulation coating disclosed by the invention is short in drying time and has good cracking resistance and sound insulation performance.

Description

Technical Field

[0001] The invention belongs to the technical field of sound insulation coatings, and more specifically, relates to a two-component floor sound insulation coating and a preparation method thereof. Background Art

[0002] Floor sound insulation is a significant issue in the current building acoustic environment. According to surveys, noise from upper and lower floors accounted for over 50% of residential noise complaints in my country in 2023-2024. Therefore, floor sound insulation is a common concern for both the real estate industry and residents. In China, some national standards and regulations set different levels of sound insulation requirements for residential building floors. For example, GB50118-2010, "Code for Design of Sound Insulation for Civil Buildings," requires floor sound insulation to meet a weighted impact sound pressure level of ≤75dB. GB / T50378-2019, "Green Building Evaluation Standard," categorizes floor sound insulation performance into three levels: one-star (weighted impact sound pressure level ≤75dB); two-star (weighted impact sound pressure level ≤70dB); and three-star (weighted impact sound pressure level ≤65dB). Some regions have also introduced policies requiring new residential buildings to meet "green building" standards for sound insulation.

[0003] Among the current mainstream floor sound insulation products, water-based sound insulation coatings occupy a certain market position. Its advantages include safety and environmental protection, low cost, simple construction, strong adhesion to the base layer, and resistance to hollowing and falling off. However, it still has some problems, which have limited its promotion and use. Specific problems include:

[0004] Sound insulation paint usually needs to be applied thickly to achieve a certain sound insulation effect. Water-based sound insulation paint is often applied with a thickness of 3-5mm or even larger in a single stroke. This causes the water-based sound insulation paint to lose water and solidify very slowly. A 3mm thick coating usually requires more than 2 days of drying time. If the humidity in the construction environment is high, this time will be further extended.

[0005] Thickly applied water-based sound insulation coatings often cause cracking of the coating film due to inconsistent water loss rates between the surface and the interior.

[0006] Existing sound insulation coatings offer inferior sound insulation performance compared to other mainstream floor insulation products, such as sound insulation pads and polyurethane foam. A coating of sound insulation coating on a 3mm thick floor typically improves impact sound by around 10dB. Meanwhile, sound insulation pads of the same thickness can improve impact sound by between 15-20dB, and polyurethane foam can achieve an improvement of between 10-20dB. Summary of the Invention

[0007] The purpose of the present invention is to provide a two-component floor sound insulation coating and a preparation method thereof. The two-component floor sound insulation coating of the present invention has a short drying time and has good crack resistance and sound insulation performance.

[0008] In order to achieve the above object, one aspect of the present invention provides a two-component floor sound insulation coating, the two-component floor sound insulation coating comprising: a liquid component and a powder component;

[0009] The liquid material components include: polymer emulsion, water, thickener and preservative;

[0010] The powder components include: silicate cement, elastic filler, modified heavy calcium, modified floating beads, aluminum powder foaming agent, water reducing agent and retarder.

[0011] The two-component floor sound insulation coating of the present invention solves the problem of long drying time during thick coating of water-based floor sound insulation coating, and reduces the actual drying time of a 3 mm coating of the coating to 3 hours, and reduces the actual drying time of a 7 mm coating to 18 hours. The two-component floor sound insulation coating of the present invention improves the cracking resistance of the water-based floor sound insulation coating when applied thickly, and the coating does not crack when applied thickly to 3 mm, and preferably does not crack when applied thickly to 7 mm. The sound insulation coating improves the impact sound of the 3 mm coating by an optimal amount of 20 dB, reaching or exceeding the sound insulation performance level of sound insulation pads and foam polyurethane of the same thickness.

[0012] The two-component floor sound insulation coating of the present invention comprises a liquid component and a powder component. The liquid component primarily comprises an aqueous polymer emulsion and various functional additives, while the powder component primarily comprises a gelling material, elastic filler, modified ground calcium carbonate, modified floating beads, a special aluminum powder foaming agent, and various admixtures. During use, the liquid and powder components are mixed and stirred, and can be applied by scraping or spraying. The resulting coating, after drying, has abundant interconnected pores within it, and the pore walls are an elastic structure composed of the polymer and elastic filler, resulting in excellent vibration damping and sound insulation.

[0013] According to the present invention, preferably, the liquid material components include, by weight: 450-600 parts of polymer emulsion, 400-550 parts of water, 1-2 parts of thickener and 1-2 parts of preservative;

[0014] The powder components include: 100-250 parts of Portland cement, 200-350 parts of elastic filler, 500-650 parts of modified heavy calcium, 10-30 parts of modified floating beads, 1-2 parts of aluminum powder foaming agent, 1-2 parts of water reducing agent and 0.5-1 part of retarder.

[0015] According to the present invention, preferably, the aluminum powder foaming agent comprises, in parts by weight: 8-12 parts of first aluminum powder, 18-22 parts of second aluminum powder, 48-52 parts of third aluminum powder and 18-22 parts of fourth aluminum powder;

[0016] The particle size distribution of the first aluminum powder satisfies: D50<3 μm, and D90<10 μm;

[0017] The particle size distribution of the second aluminum powder satisfies: 30μm < D50 < 40μm, and D90 < 80μm;

[0018] The particle size distribution of the third aluminum powder satisfies: 85μm < D50 < 100μm, and D90 < 160μm;

[0019] The fourth aluminum powder is aluminum powder treated by air passivation. The particle size distribution of the aluminum powder raw material for preparing the fourth aluminum powder satisfies: 85μm < D50 < 100μm, and Dĩ0 < 160μm.

[0020] According to the present invention, preferably, the fourth aluminum powder is prepared by a method comprising the following steps: mixing aluminum powder with a particle size distribution satisfying 85μm < D50 < 100μm and D90 < 160μm with absolute ethanol, continuously introducing air during the mixing process, and then performing suction filtration, washing, and drying to obtain the aluminum powder treated by air passivation; wherein, the material-liquid ratio of the aluminum powder to absolute ethanol is 1:(3 - 5) kg / L; the flow rate of the air is 1 - 1.5 L / min; the mixing time is 30 - 40 min.

[0021] According to the present invention, preferably, the aluminum powder foaming agent is prepared by a method comprising the following steps: mixing the first aluminum powder, the second aluminum powder, the third aluminum powder, and the fourth aluminum powder evenly to obtain the aluminum powder foaming agent.

[0022] In an alkaline environment, aluminum powder can react with hydroxide ions and water to generate hydrogen gas. The present invention uses aluminum powder as a foaming agent and introduces pores into the coating slurry by chemical foaming. The inventors of the present invention have found through research that: generally, when aluminum powder is used as a foaming agent, it has the following characteristics: (1) Aluminum powder can react with hydroxide ions and water to release a large amount of heat, causing the temperature of the coating slurry to rise; (2) A dense aluminum oxide film covers the surface of the aluminum powder, and the aluminum oxide film needs to be dissolved before it can react with OH ,

[0023] ions to generate hydrogen gas. The thickness of the aluminum oxide film on the aluminum powder particles increases with the increase of their particle size; therefore, the larger the particle size of the aluminum powder, the later the start time of foaming; (3) The larger the particle size of the aluminum powder, the smaller its specific surface area, and the smaller the contact area between the aluminum powder particles and the OH - ions in the solution, the smaller the final volume of the gas generated by the reaction, and the longer the time required to reach the final gas volume. Based on the above characteristics of aluminum powder, the inventors of the present invention creatively thought of mixing four different particle sizes and treatment methods of aluminum powder to meet the performance requirements of the sound insulation coating of the present invention.

[0023] The characteristics of the aluminum powder foaming agent of the present invention are reflected in the foaming effect and the heat release effect. In terms of foaming effect: within about 30 minutes after the liquid and powder components of the coating are stirred, the first and second aluminum powders mainly react. During this stage, the cementitious material in the coating is basically in an unhydrated state, and the slurry viscosity is low. Therefore, the bubbles produced are relatively large, and the pore size is mostly greater than 100μm. In the stage of 30min-2h, the third aluminum powder mainly reacts. During this stage, the cementitious material is partially hydrated, and the slurry viscosity is high. Therefore, the bubbles produced in this stage are small in size, and a large number of micropores with a pore size less than 10μm will continue to be produced. After 2h, the coating slurry is basically hardened and no pores will be produced. First, a large number of bubbles form a loose and porous coating after drying. Combined with the elastic structure, the coating has good shock-absorbing and sound-insulating effects. At the same time, the pore structure connecting the macropores and micropores forms a pore structure similar to a Helmholtz resonance cavity, which further enhances the resonance of sound waves and enhances the sound absorption effect. Regarding the exothermic effect: Within approximately 30 minutes after stirring the coating's liquid and powder components, the combined action of the first and second aluminum powders raises the slurry temperature to approximately 50°C at a relatively slow rate. During the 30-minute to 2-hour period, the continued heat release of the third and fourth aluminum powders maintains the slurry temperature at 45-50°C. After 2 hours, the slurry temperature drops, albeit at a slower rate due to the action of the fourth aluminum powder. The combined action of these four aluminum powders maintains the overall temperature of the coating's liquid and powder components after stirring at a relatively high level, accelerating the water loss rate of the polymer emulsion and the hydration rate of the cementitious material. Consequently, the coating's surface-drying and through-drying times are shortened. Furthermore, because the temperature curve is gentle and the temperature rise occurs during the pre-hydration and hardening phase of the slurry, the coating maintains excellent volume stability during the drying process.

[0024] According to the present invention, preferably, the modified floating beads are prepared by a method comprising the following steps: mixing the floating beads with hydrofluoric acid, and then filtering, washing, and drying to obtain the modified floating beads;

[0025] The volume concentration of the hydrofluoric acid is 1-1.5%; the material-liquid ratio of the floating beads to the hydrofluoric acid is 1:(12-15) kg / L; and the stirring and mixing time is 2-3 minutes.

[0026] The present invention performs HF acid etching modification on the floating beads. HF is used to corrode the surface of the floating beads to form micropores, and the floating beads are modified into hollow spheres with micropores all over the surface. The modified floating beads are hollow spheres with micropores all over the surface, which together with the pores in the coating constitute interconnected water volatilization channels, effectively accelerating the volatilization of water inside the coating when the coating is thickly applied and the film formation of the polymer emulsion. Therefore, the application of modified floating beads can bring three benefits: reducing the actual drying time of the coating; balancing the surface and internal water loss rates of the coating when it dries, reducing the risk of cracking of the coating; helping to form pores inside the coating, and its own hollow structure can effectively improve the efficiency of the coating in absorbing vibration energy and improve the sound insulation performance of the coating.

[0027] According to the present invention, preferably, the modified heavy calcium carbonate is prepared by a method comprising the following steps: adjusting the pH of a dodecyltrimethylammonium bromide aqueous solution to 9-11 with aqueous ammonia, then mixing heavy calcium carbonate and a dodecyltrimethylammonium bromide aqueous solution with a pH of 9-11, and finally filtering, washing and drying the suspension to obtain the modified heavy calcium carbonate;

[0028] The mass concentration of the dodecyltrimethylammonium bromide aqueous solution is 1.4-2%; the material-liquid ratio of the heavy calcium carbonate to the dodecyltrimethylammonium bromide aqueous solution with a pH of 9-11 is 1:(8-10) kg / L; the mixing temperature is 75-85° C., and the mixing time is 1.5-2.5 hours.

[0029] In this invention, dodecyltrimethylammonium bromide (DTAB) is used to hydrophobically modify the surface of heavy calcium carbonate. The hydrophobic modified heavy calcium carbonate can adsorb on the air-water interface of bubbles, reducing liquid drainage, inhibiting the disproportionation between bubbles of different sizes, and effectively improving foam stability, thereby producing a long-lasting, rich foam.

[0030] According to the present invention, preferably, the polymer emulsion is at least one of pure acrylic emulsion, styrene acrylic emulsion and ethylene vinyl acetate emulsion, and the solid content of the polymer emulsion is not less than 55%;

[0031] The thickener is at least one of an associative polyurethane thickener, an inorganic salt thickener, a fatty alcohol thickener, an ether thickener, an ester thickener, a cellulose thickener, and a natural rubber thickener;

[0032] The elastic filler is rubber powder with an average particle size of less than 400 μm;

[0033] The water reducer is a polycarboxylic acid water reducer;

[0034] The retarder is sodium citrate.

[0035] According to the present invention, preferably, the mass ratio of the liquid component to the powder component is 1:(1.1-1.2).

[0036] Another aspect of the present invention provides a method for preparing the above-mentioned two-component floor sound insulation coating, the preparation method comprising:

[0037] The polymer emulsion and water are stirred and mixed uniformly, and then the thickener and preservative are added and stirred and mixed uniformly to obtain the liquid component;

[0038] The silicate cement, elastic filler and modified heavy calcium are stirred and mixed, and then the modified floating beads are added and stirred and mixed evenly. Finally, the aluminum powder foaming agent, water reducer and retarder are added and stirred and mixed evenly to obtain the powder component.

[0039] In the present invention, as a preferred embodiment, after the silicate cement, elastic filler and modified heavy calcium are stirred and mixed for 1-2 minutes, the modified floating beads are divided into three equal parts and then added three times, each time with an interval of 20-30 seconds. After the last portion of the modified floating beads is added, stirring is continued for 0.5-1 minutes. Finally, the aluminum powder foaming agent, water reducer and retarder are added and stirred for 4-6 minutes to obtain the powder component. The stirring speed for preparing the powder component is preferably 200-300r / min.

[0040] The present invention has the following beneficial effects: the two-component floor sound insulation coating of the present invention has a short drying time and has good crack resistance and sound insulation performance.

[0041] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings, wherein like reference numerals generally represent like components throughout the exemplary embodiments of the present invention.

[0043] Figure 1 A gas volume change curve under the action of different aluminum powders according to the present invention is shown.

[0044] Figure 2 The figure shows a temperature variation curve of the two-component floor sound insulation coating according to Example 1 of the present invention. DETAILED DESCRIPTION

[0045] The preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. Instead, these embodiments are provided to make the present invention more thorough and complete and to fully convey the scope of the present invention to those skilled in the art.

[0046] The present invention is further described below by way of examples:

[0047] In the following embodiments and comparative examples:

[0048] The polymer emulsion used is a styrene acrylic emulsion, specifically Budford 866H emulsion; the solid content is 55.4% ± 0.2%;

[0049] The thickener used was an associative polyurethane thickener, specifically Rohm and Haas RM-8W thickener;

[0050] The preservative used was Sol MBS;

[0051] The cement used is 42.5 grade Portland cement;

[0052] The elastic filler used is rubber powder with an average particle size of 250 μm ± 30 μm;

[0053] The water reducer used is a polycarboxylic acid water reducer, specifically Sika 540P water reducer;

[0054] The retarder used was sodium citrate;

[0055] The modified heavy calcium carbonate was prepared by a method comprising the following steps: adding 18 kg of dodecyltrimethylammonium bromide (DTAB) to 1000 L of deionized water and dissolving the mixture by stirring to obtain an aqueous solution of dodecyltrimethylammonium bromide; adjusting the pH of the aqueous solution of dodecyltrimethylammonium bromide to 9-11 with aqueous ammonia; and mixing 100 kg of heavy calcium carbonate with 900 L of the DTAB aqueous solution having a pH of 9-11 at 80° C. for 2 hours. Afterwards, the suspension was filtered, washed, and dried to obtain the modified heavy calcium carbonate.

[0056] The modified floating beads used are prepared by a method comprising the following steps: 1 kg of floating beads with an average particle size of 120 μm ± 20 μm is stirred and mixed with 13 L of hydrofluoric acid with a volume concentration of 1.2% for 3 minutes, and then the suspension is filtered, washed, and dried to obtain the modified floating beads.

[0057] The aluminum powder foaming agent is prepared by a method including the following steps: mixing the first aluminum powder, the second aluminum powder, the third aluminum powder and the fourth aluminum powder evenly to obtain the aluminum powder foaming agent. Among them, in parts by weight, the aluminum powder foaming agent includes: 10 parts of the first aluminum powder, 20 parts of the second aluminum powder, 50 parts of the third aluminum powder and 20 parts of the fourth aluminum powder;

[0058] The particle size distribution of the first aluminum powder satisfies: D50 < 3μm and D90 < 10μm;

[0059] The particle size distribution of the second aluminum powder satisfies: 30μm < D50 < 40μm and D90 < 80μm;

[0060] The particle size distribution of the third aluminum powder satisfies: 85μm < D50 < 100μm and D90 < 160μm;

[0061] The fourth aluminum powder is an aluminum powder treated by air passivation, and the particle size distribution of the aluminum powder raw material for preparing the fourth aluminum powder satisfies: 85μm < D50 < 100μm and D90 < 160μm;

[0062] The fourth aluminum powder is prepared by a method including the following steps: adding aluminum powder with a particle size distribution satisfying 85μm < D50 < 100μm and D90 < 160μm and absolute ethanol into a container, stirring for 30 min, and continuously introducing air during the stirring process. After the stirring is completed, it is subjected to suction filtration, washing and drying to obtain the aluminum powder treated by air passivation; the material-liquid ratio of the aluminum powder to absolute ethanol is 1:4 kg / L; the flow rate of the air is 1 L / min.

[0063] Example 1

[0064] Weigh 500 parts by weight of deionized water and add it to the liquid material stirring tank. Start the disperser of the stirring tank, keep the rotation speed at 300 r / min, add 500 parts by weight of the polymer emulsion, stir for 5 minutes, then increase the rotation speed to 800 r / min and stir for 20 minutes. Finally, slowly add 1 part by weight of the thickener, 1 part by weight of the preservative in sequence, and stir at 600 r / min for 10 minutes. Reduce the rotation speed to 200 r / min and stir for 5 minutes for mechanical defoaming to obtain the liquid material component of the sound insulation coating.

[0065] Add 200 parts by weight of cement, 300 parts by weight of elastic filler, and 600 parts by weight of modified heavy calcium into the powder mixer and start stirring, with the stirring speed at 200 r / min; after stirring for 1 min, divide 30 parts by weight of modified cenospheres into 3 equal parts, then add them to the mixer in 3 times, with an interval of 30 s each time. After the last part of the modified cenospheres is added, continue stirring for 1 min, add 2 parts by weight of the aluminum powder foaming agent, 1 part by weight of the water reducing agent and 1 part by weight of the retarder, and continue stirring for 5 min to obtain the powder component of the sound insulation coating.

[0066] Example 2

[0067] 500 parts by weight of deionized water were metered and added to a liquid mixing tank. The dispersing machine in the mixing tank was turned on at a speed of 300 r / min. 500 parts by weight of the polymer emulsion was added. After stirring for 5 minutes, the speed was increased to 800 r / min and stirred for 20 minutes. Finally, 1 part by weight of a thickener and 1 part by weight of a preservative were slowly added in sequence, stirring at 600 r / min for 10 minutes. The speed was reduced to 200 r / min and stirred for 5 minutes. After mechanical defoaming, the liquid component of the sound insulation coating was obtained.

[0068] Add 200 parts by weight of cement, 300 parts by weight of elastic filler and 600 parts by weight of modified heavy calcium into a powder mixer and start stirring at a stirring speed of 200 r / min. After stirring for 1 minute, divide 10 parts by weight of modified floating beads into 3 equal parts and then add them into the mixer in 3 times, each time with an interval of 30 seconds. After the last part of modified floating beads is added, continue stirring for 1 minute, add 2 parts by weight of aluminum powder foaming agent, 1 part by weight of water reducer and 1 part by weight of retarder, and continue stirring for 5 minutes to obtain the powder component of the sound insulation coating.

[0069] Example 3

[0070] 500 parts by weight of deionized water were metered and added to a liquid mixing tank. The dispersing machine in the mixing tank was turned on at a speed of 300 r / min. 500 parts by weight of the polymer emulsion was added. After stirring for 5 minutes, the speed was increased to 800 r / min and stirred for 20 minutes. Finally, 1 part by weight of a thickener and 1 part by weight of a preservative were slowly added in sequence, stirring at 600 r / min for 10 minutes. The speed was reduced to 200 r / min and stirred for 5 minutes. After mechanical defoaming, the liquid component of the sound insulation coating was obtained.

[0071] Add 200 parts by weight of cement, 300 parts by weight of elastic filler and 500 parts by weight of modified heavy calcium into a powder mixer and start stirring at a stirring speed of 200 r / min. After stirring for 1 minute, divide 30 parts by weight of modified floating beads into 3 equal parts and then add them into the mixer in 3 times, each time with an interval of 30 seconds. After the last part of modified floating beads is added, continue stirring for 1 minute, add 2 parts by weight of aluminum powder foaming agent, 1 part by weight of water reducer and 1 part by weight of retarder, and continue stirring for 5 minutes to obtain the powder component of the sound insulation coating.

[0072] Example 4

[0073] 500 parts by weight of deionized water were metered and added to a liquid mixing tank. The dispersing machine in the mixing tank was turned on at a speed of 300 r / min. 500 parts by weight of the polymer emulsion was added. After stirring for 5 minutes, the speed was increased to 800 r / min and stirred for 20 minutes. Finally, 1 part by weight of a thickener and 1 part by weight of a preservative were slowly added in sequence, stirring at 600 r / min for 10 minutes. The speed was reduced to 200 r / min and stirred for 5 minutes. After mechanical defoaming, the liquid component of the sound insulation coating was obtained.

[0074] Add 200 parts by weight of cement, 300 parts by weight of elastic filler and 600 parts by weight of modified heavy calcium into a powder mixer and start stirring at a stirring speed of 200 r / min. After stirring for 1 minute, divide 30 parts by weight of modified floating beads into 3 equal parts and then add them into the mixer in 3 times, each time with an interval of 30 seconds. After the last part of modified floating beads is added, continue stirring for 1 minute, add 1 part by weight of aluminum powder foaming agent, 1 part by weight of water reducer and 1 part by weight of retarder, and continue stirring for 5 minutes to obtain the powder component of the sound insulation coating.

[0075] Comparative Example 1

[0076] 500 parts by weight of deionized water were metered and added to a liquid mixing tank. The dispersing machine in the mixing tank was turned on at a speed of 300 r / min. 500 parts by weight of the polymer emulsion was added. After stirring for 5 minutes, the speed was increased to 800 r / min and stirred for 20 minutes. Finally, 1 part by weight of a thickener and 1 part by weight of a preservative were slowly added in sequence, stirring at 600 r / min for 10 minutes. The speed was reduced to 200 r / min and stirred for 5 minutes. After mechanical defoaming, the liquid component of the sound insulation coating was obtained.

[0077] Add 200 parts by weight of cement, 300 parts by weight of elastic filler and 600 parts by weight of modified heavy calcium into a powder mixer and start stirring at a stirring speed of 200 r / min. After stirring for 1 minute, divide 30 parts by weight of unmodified floating beads into 3 equal parts and then add them into the mixer in 3 times, each time with an interval of 30 seconds. After the last part of unmodified floating beads is added, continue stirring for 1 minute, add 2 parts by weight of aluminum powder foaming agent, 1 part by weight of water reducer and 1 part by weight of retarder, and continue stirring for 5 minutes to obtain the powder component of the sound insulation coating.

[0078] Comparative Example 2

[0079] 500 parts by weight of deionized water were metered and added to a liquid mixing tank. The dispersing machine in the mixing tank was turned on at a speed of 300 r / min. 500 parts by weight of the polymer emulsion was added. After stirring for 5 minutes, the speed was increased to 800 r / min and stirred for 20 minutes. Finally, 1 part by weight of a thickener and 1 part by weight of a preservative were slowly added in sequence, stirring at 600 r / min for 10 minutes. The speed was reduced to 200 r / min and stirred for 5 minutes. After mechanical defoaming, the liquid component of the sound insulation coating was obtained.

[0080] Add 200 parts by weight of cement, 300 parts by weight of elastic filler, and 600 parts by weight of unmodified heavy calcium carbonate into a powder mixer and start stirring at a speed of 200 r / min. After stirring for 1 min, divide 30 parts by weight of modified cenospheres into 3 equal parts and then add them to the mixer in 3 times, with an interval of 30 s each time. After the addition of the last portion of modified cenospheres is completed, continue stirring for 1 min, add 2 parts by weight of aluminum powder foaming agent, 1 part by weight of water reducing agent, and 1 part by weight of retarder, and continue stirring for 5 min to obtain the powder component of the sound insulation coating.

[0081] Comparative Example 3

[0082] Measure 500 parts by weight of deionized water and add it to the liquid material stirring tank. Start the disperser of the stirring tank and keep the rotation speed at 300 r / min. Add 500 parts by weight of polymer emulsion and stir for 5 minutes, then increase the rotation speed to 800 r / min and stir for 20 minutes. Finally, slowly add 1 part by weight of thickener and 1 part by weight of preservative in sequence and stir at 600 r / min for 10 minutes. Reduce the rotation speed to 200 r / min and stir for 5 minutes to mechanically defoam to obtain the liquid component of the sound insulation coating.

[0083] Add 200 parts by weight of cement, 300 parts by weight of elastic filler, and 600 parts by weight of modified heavy calcium carbonate into a powder mixer and start stirring at a speed of 200 r / min. After stirring for 1 min, divide 30 parts by weight of modified cenospheres into 3 equal parts and then add them to the mixer in 3 times, with an interval of 30 s each time. After the addition of the last portion of modified cenospheres is completed, continue stirring for 1 min, add 1 part by weight of ordinary aluminum powder foaming agent with a particle size distribution of 85μm < D50 < 100μm and D90 < 160μm, 1 part by weight of water reducing agent, and 1 part by weight of retarder, and continue stirring for 5 min to obtain the powder component of the sound insulation coating.

[0084] Test Example 1

[0085] Prepare an aqueous sodium hydroxide solution with a pH value equal to that of the slurry obtained by mixing the liquid component and the powder component of Example 1 of the present invention in a mass ratio of 1:1.1 as a simulation liquid. Add the simulation liquid to an aluminum powder paste gas generation measuring instrument (the equipment complies with the standard JC / T407 - 2008), add 2 g of the first aluminum powder, the second aluminum powder, the third aluminum powder, and the fourth aluminum powder to 1 L of the simulation liquid respectively, and record the gas volume every 1 min. The change curve of the gas volume released by the foaming reaction under the action of different aluminum powders is obtained through the experiment, and the results are as Figure 1 shown.

[0086] On an area of 1 m 2The slurry obtained by mixing the liquid component and the powder component of Example 1 in a mass ratio of 1:1.1 was applied to a 7mm square concrete floor slab, and the temperature change of the slurry on the surface of the concrete floor slab was tested to obtain a temperature change curve. The results are as follows: Figure 2 The test environment temperature is 23°C, and the temperature of the floor surface before the slurry to be tested is the same as the test environment temperature, which is also 23°C. The temperature of the slurry on the surface of the concrete floor is tested once every one minute. The temperature of the slurry on the surface of the concrete floor obtained in each test is obtained by the following method: the diagonal of the test floor coated with the slurry is divided into four equal parts, and then the slurry temperature at the three equal points on the diagonal is tested. Finally, the average of the slurry temperatures at the three equal points is taken as the temperature of the slurry on the surface of the concrete floor obtained in each test. Based on the series of average temperatures obtained above, a temperature change curve is obtained.

[0087] Depend on Figure 1 and Figure 2 It can be seen that: the first aluminum powder has the smallest particle size, the start foaming time is about 1 minute, the end foaming time is 12 minutes, the reaction exotherm is large, and the room temperature coating slurry temperature can be increased to 40-45°C; the second aluminum powder starts foaming in 10 minutes and ends foaming in about 40 minutes. The reaction exotherm is small but lasts for a long time, and the slurry temperature can be further slowly increased to about 50°C; the third aluminum powder starts foaming in 30 minutes and ends foaming in about 2 hours. The reaction exotherm at this stage can keep the slurry temperature above 45-50°C; the fourth aluminum powder has been air passivated, the start reaction time is about 1 hour, the reaction is slow, and the slurry temperature drops.

[0088] Test Example 2

[0089] The liquid and powder components of the above examples and comparative examples were mixed uniformly at a mass ratio of 1:1.1. The results were then tested according to the requirements of Q / SY YHF 0210-2024, "Water-Resistant Sound-Insulating Coatings for Building Floors": surface drying time for a 3mm dry film, through drying time for a 3mm dry film, and impact sound insulation performance for a 3mm dry film. Additionally, surface drying time and through drying time for a 7mm dry film were tested. Initial drying crack resistance for 3mm and 7mm dry films was tested according to the method described in JG / T24-2000, "Synthetic Resin Emulsion Sandwall Architectural Coatings." The corresponding test results are as follows:

[0090] Table 1

[0091]

[0092] As shown in Table 1, after the modification of the floating beads, the actual drying time of the sound insulation coating is reduced, the initial drying anti-cracking performance is improved, and the impact sound insulation performance of the coating is improved; and the above performance is improved to a certain extent by increasing the addition amount of the modified floating beads.

[0093] It can be seen from Example 1, Example 3, and Comparative Example 2 that after the modification of heavy calcium carbonate, the bubble stability of the coating is improved, the pore structure of the coating is stable during the drying process of the coating, and the pore structure of the coating can be retained as the coating dries, so that the dry film of the coating has good cushioning and shock absorbing properties; and as the amount of modified heavy calcium carbonate added increases, the above-mentioned properties are improved to a certain extent; when the amount of modified heavy calcium carbonate added is high enough, the initial anti-cracking performance of the coating when thickly applied is also improved to a certain extent.

[0094] From Examples 1, 4, and 3, it can be seen that the aluminum powder foaming agent can significantly reduce the surface-drying and through-drying times of the coating. Compared with ordinary aluminum powder with a single particle size distribution, the aluminum powder foaming agent of the present invention can maintain the temperature of the coating slurry at a higher level and for a longer period of time, thereby accelerating the water loss rate of the polymer emulsion and the hydration rate of the cementitious material. As a result, the surface-drying and through-drying times of the coating are shortened. At the same time, it can avoid the problem of cracking caused by excessive reaction concentration and rapid temperature increase. Ordinary aluminum powder foaming agents form large pores in the coating with a single size distribution, while the pore structure formed by the aluminum powder foaming agent of the present invention is a pore structure with interconnected macropores and micropores, forming a Helmholtz resonance cavity-like structure, enhancing sound wave resonance and improving the absorption of vibration energy, thereby improving impact sound insulation performance.

[0095] While various embodiments of the present invention have been described above, the above description is intended to be illustrative, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A two-component floor sound insulation coating, characterized in that: The two-component floor sound insulation coating comprises: a liquid component and a powder component; The liquid component comprises: a polymer emulsion, water, a thickening agent and a preservative; The powder component comprises: portland cement, an elastic filler, modified heavy calcium, modified cenospheres, an aluminum powder foaming agent, a water reducing agent and a retarder.

2. The two-component floor sound insulation coating according to claim 1, wherein: In terms of parts by weight, the liquid component comprises: 450-600 parts of a polymer emulsion, 400-550 parts of water, 1-2 parts of a thickening agent and 1-2 parts of a preservative; The powder component comprises: 100-250 parts of portland cement, 200-350 parts of an elastic filler, 500-650 parts of modified heavy calcium, 10-30 parts of modified cenospheres, 1-2 parts of an aluminum powder foaming agent, 1-2 parts of a water reducing agent and 0.5-1 part of a retarder.

3. The two-component floor sound insulation coating according to claim 1 or 2, wherein: In terms of parts by weight, the aluminum powder foaming agent comprises: 8-12 parts of first aluminum powder, 18-22 parts of second aluminum powder, 48-52 parts of third aluminum powder and 18-22 parts of fourth aluminum powder; The particle size distribution of the first aluminum powder satisfies: D50 < 3 μm and D90 < 10 μm; The particle size distribution of the second aluminum powder satisfies: 30 μm < D50 < 40 μm and D90 < 80 μm; The particle size distribution of the third aluminum powder satisfies: 85 μm < D50 < 100 μm and D90 < 160 μm; The fourth aluminum powder is aluminum powder subjected to air passivation treatment, and the particle size distribution of the aluminum powder raw material for preparing the fourth aluminum powder satisfies: 85 μm < D50 < 100 μm and D90 < 160 μm.

4. The two-component floor sound insulation coating according to claim 3, wherein: The fourth aluminum powder is prepared by a method comprising the following steps: mixing aluminum powder with a particle size distribution satisfying 85 μm < D50 < 100 μm and D90 < 160 μm with absolute ethanol by stirring, and continuously introducing air during the stirring process, and then performing suction filtration, washing and drying to obtain the aluminum powder subjected to air passivation treatment; Wherein, the material-liquid ratio of the aluminum powder to the absolute ethanol is 1:(3-5) kg / L; the flow rate of the air is 1-1.5 L / min; the stirring time is 30-40 min.

5. The two-component floor sound insulation coating according to claim 3, wherein: The aluminum powder foaming agent is prepared by a method comprising the following steps: uniformly mixing the first aluminum powder, the second aluminum powder, the third aluminum powder and the fourth aluminum powder to obtain the aluminum powder foaming agent.

6. The two-component floor sound insulation coating according to claim 1 or 2, wherein: The modified cenospheres are prepared by a method comprising the following steps: stirring and mixing cenospheres with hydrofluoric acid, and then performing suction filtration, washing and drying to obtain the modified cenospheres; Wherein, the volume concentration of the hydrofluoric acid is 1-1.5%; the material-liquid ratio of the cenospheres to the hydrofluoric acid is 1:(12-15) kg / L; the stirring and mixing time is 2-3 min.

7. The two-component floor sound insulation coating according to claim 1 or 2, wherein: The modified heavy calcium is prepared by a method comprising the following steps: adjusting the pH of an aqueous solution of dodecyl trimethyl ammonium bromide to 9-11 with ammonia water, then mixing heavy calcium carbonate with the aqueous solution of dodecyl trimethyl ammonium bromide with a pH of 9-11, and finally performing suction filtration, washing and drying on the suspension to obtain the modified heavy calcium; The mass concentration of the dodecyltrimethylammonium bromide aqueous solution is 1.4-2%; the material-liquid ratio of the heavy calcium carbonate to the dodecyltrimethylammonium bromide aqueous solution with a pH of 9-11 is 1:(8-10) kg / L; the mixing temperature is 75-85° C., and the mixing time is 1.5-2.5 hours.

8. The two-component floor sound insulation coating according to claim 1 or 2, wherein: The polymer emulsion is at least one of pure acrylic emulsion, styrene acrylic emulsion and ethylene vinyl acetate emulsion, and the solid content of the polymer emulsion is not less than 55%; The thickener is at least one of an associative polyurethane thickener, an inorganic salt thickener, a fatty alcohol thickener, an ether thickener, an ester thickener, a cellulose thickener, and a natural rubber thickener; The elastic filler is rubber powder with an average particle size of less than 400 μm; The water reducer is a polycarboxylic acid water reducer; The retarder is sodium citrate.

9. The two-component floor sound insulation coating according to claim 1 or 2, wherein: The mass ratio of the liquid component to the powder component is 1:(1.1-1.2).

10. The method for preparing the two-component floor sound insulation coating according to any one of claims 1 to 9, characterized in that: The preparation method comprises: The polymer emulsion and water are stirred and mixed uniformly, and then the thickener and preservative are added and stirred and mixed uniformly to obtain the liquid component; The silicate cement, elastic filler and modified heavy calcium are stirred and mixed, and then the modified floating beads are added and stirred and mixed evenly. Finally, the aluminum powder foaming agent, water reducer and retarder are added and stirred and mixed evenly to obtain the powder component.

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