A noise reduction coating for interior walls of a building and a preparation method thereof

Abstract

The invention discloses a noise reduction coating for an interior wall of a building and a preparation method thereof, and relates to the technical field of noise reduction coatings for buildings. The raw materials for preparing the coating include, by weight, 80-90 parts of composite silica gel; 80-90 parts of porous powder; 20-30 parts of high-polysilicon carbon; 0.5-1 parts of dispersant; 40-50 parts of silica sol; and 10-20 parts of auxiliary agent. The invention forms a multi-scale pore structure by compounding first-grade sodium silicate crystals with nano-silicon dioxide, and significantly improves the absorption capacity of the coating to low-frequency sound waves. The first-grade sodium silicate crystals are subjected to multiple screening and activated carbon adsorption treatments, and the crystal purity is improved, and the water absorption multiple and water absorption amount are controllable, so as to avoid cracking or falling off of the coating due to hygroscopic expansion. Secondly, the composite silica gel has stable performance and is non-toxic and harmless, and the environmental protection of the coating is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of building noise reduction coatings, in particular to a building interior wall noise reduction coating and a preparation method thereof. Background Art

[0002] In modern building design, noise pollution has become one of the important factors affecting the quality of life of residents. With the acceleration of urbanization, the distance between buildings is getting closer, the traffic flow is increasing, and the noise of indoor equipment is growing, people's requirements for building sound insulation performance are getting higher and higher. Traditional sound insulation methods mainly include physical isolation (such as using heavy wall materials) and sound-absorbing structures (such as installing sound-absorbing panels). Although these methods are effective, they have certain limitations in practical applications, such as high cost, complex construction, and large space occupation.

[0003] In recent years, researchers have begun to explore more efficient, economical and easy-to-implement sound insulation solutions, especially for the treatment of interior walls of buildings. In this regard, coatings have received widespread attention as a convenient surface treatment method. However, most existing sound insulation coatings mainly rely on organic or inorganic fiber materials to achieve their functions. Although these materials can reduce noise transmission to a certain extent, they are often accompanied by other problems, such as poor durability and poor environmental performance.

[0004] At the same time, some new materials and technologies have also been applied in the field of sound insulation. For example, aerogel is used as a sound insulation material due to its excellent thermal insulation and sound absorption properties, but its high cost limits its large-scale application. In addition, some research focuses on sound-absorbing panels made of mineral wool, which usually require specific adhesives for fixing and may have a negative impact on the environment. Summary of the invention

[0005] In view of the problems existing in the existing noise reduction coating for interior walls of buildings and the preparation method thereof, the present invention is proposed.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] In a first aspect, an embodiment of the present invention provides a noise reduction coating for an interior wall of a building. The raw materials for preparing the coating include, by weight,

[0008] 80-90 parts of composite silicone gel;

[0009] 80-90 parts of porous powder;

[0010] 20-30 parts of high poly silicon carbon;

[0011] 0.5-1 part dispersant;

[0012] 40-50 parts of silica sol;

[0013] 10-20 parts of additives;

[0014] 0.1-2 parts pH adjuster.

[0015] As a preferred solution of the noise reduction coating for interior walls of buildings of the present invention, the raw materials of the high-polysilicon-carbon include, by weight,

[0016] 10-20 parts of carbonaceous material;

[0017] 10-20 parts of silicon carbide;

[0018] 20-40 parts of carbon nanotubes;

[0019] 1-2 parts of carboxymethyl cellulose;

[0020] 2-3 parts of dodecyl dimethyl amine oxide;

[0021] 100-200 parts of ethanol.

[0022] As a preferred solution of the noise reduction coating for interior walls of buildings of the present invention, the raw materials of the porous powder include, by weight,

[0023] 6-9 parts of kaolin;

[0024] 2-4 parts diatomaceous earth;

[0025] 1-2 parts mica powder;

[0026] 2-5 parts calcite.

[0027] As a preferred solution of the noise reduction coating for interior walls of buildings of the present invention, the raw materials of the composite silicone gel include, by weight,

[0028] 3-5 parts of first-grade sodium silicate crystals;

[0029] 0.2-0.4 parts of nano silicon dioxide;

[0030] 20-50 parts deionized water.

[0031] As a preferred embodiment of the noise reduction coating for interior walls of buildings of the present invention, the method for preparing the first-grade sodium silicate crystals comprises the following steps:

[0032] Step 1.1, sieve the grade 3 sodium silicate crystals with a sieve with an aperture of 20 microns, and take the sieve residue for later use;

[0033] Step 1.2, mix 1 part of the sieve residue, 0.25 parts of polyacrylamide, 1-2 parts of disodium hydrogen phosphate and 1000 parts of deionized water, control the temperature to 50°C-60°C, and stir to disperse evenly;

[0034] Step 1.3, adjust the pH value to 6-7 with hydrochloric acid, add 1 part of sodium gluconate, and treat with ultrasound for 15-20 minutes;

[0035] Step 1.4, add 0.02 parts of activated carbon, let it stand for 24 hours, and perform a second screening with a sieve with a pore size of 20 microns;

[0036] Step 1.5: Repeat steps 1.2 to 1.4 three times with the sieved material obtained from the second screening, and wash the sieved material with deionized water for 2-5 times until the pH value of the washing solution is neutral, thereby obtaining first-grade sodium silicate crystals.

[0037] As a preferred solution of the noise reduction coating for interior walls of buildings described in the present invention, the method for preparing the high-polysilicon carbon comprises the following steps:

[0038] The carbonaceous material, silicon carbide, carbon nanotubes, carboxymethyl cellulose, dodecyl dimethyl amine oxide and ethanol are mixed and stirred to prepare a reaction mixture;

[0039] Use 10-20 parts of 40% silicon hydroxide solution by mass percentage, add it into the reactor at a speed of 1-2 ml / min through a peristaltic pump, control the temperature at 40°C-50°C, and stir for 15-20 minutes;

[0040] A mixture of 10-20 parts of ethyl orthosilicate and 15-25 parts of a 40% by mass silicon hydroxide solution is continuously added to the reactor at a rate of 8 ml / min through a peristaltic pump, stirred for 50 minutes, and then allowed to stand for 9-10 hours;

[0041] Filter and wash with anhydrous ethanol 3-5 times, and dry at 80℃-90℃;

[0042] Place in a muffle furnace and heat from room temperature to 400-450°C at a rate of 1°C / min, calcine for 2-3 hours under nitrogen protection, and then ball mill and sieve after cooling to room temperature to obtain high-poly silicon carbon;

[0043] Among them, the carbonaceous material is activated carbon.

[0044] As a preferred solution of the noise reduction coating for interior walls of buildings of the present invention, the method for preparing the porous powder comprises the following steps:

[0045] Premix diatomaceous earth and water at 35°C for 10-15 minutes;

[0046] Add calcite, kaolin and mica powder and continue premixing for 10-15 minutes;

[0047] The mixture is ball-milled for 40-60 minutes at a rotation speed of 300-500 r / min to obtain a porous powder.

[0048] As a preferred embodiment of the noise reduction coating for interior walls of buildings described in the present invention, the size of the first-grade sodium silicate crystals is 100-500 microns, the water absorption multiple is 3.0-5.0, and the water absorption amount is 2000-3000 ppm; the particle size of the nano-silicon dioxide is 4-6 nanometers.

[0049] As a preferred embodiment of the noise reduction coating for interior walls of buildings of the present invention, the dispersant is fatty alcohol polyoxyethylene ether;

[0050] The pH regulator is citric acid;

[0051] The auxiliary agent includes at least one of a defoamer, a leveling agent, a matting agent and a wetting agent;

[0052] The dispersed phase particle size of silicon dioxide in the silica sol is 5-20 nanometers.

[0053] In a second aspect, an embodiment of the present invention provides a method for preparing a noise reduction coating for an interior wall of a building, which is used to prepare the noise reduction coating for an interior wall of a building, comprising the following steps:

[0054] Mix 3-5 parts of first-grade sodium silicate crystals and 0.2-0.4 parts of nano-silicon dioxide at 50° C. for 60 minutes, control the rotation speed to 60-80 r / min, add 20-50 parts of deionized water at a speed of 1-2 ml / min, and continue stirring for 40-60 minutes to obtain a composite silica gel;

[0055] Put 80-90 parts of composite silica gel and 80-90 parts of porous powder into a reaction container, stir at a speed of 500 r / min for 10-15 minutes, and add 3-5 parts of high-polysilicon carbon every 2 minutes to obtain a powder mixture;

[0056] pH regulator and dispersant are added dropwise to the powder mixture at a rate of 1-2 ml / min, and 40-50 parts of silica sol and 10-20 parts of additives are added at the same time, and stirred at a rate of 500 r / min for 20-30 minutes to obtain a slurry;

[0057] The remaining high-poly silicon carbon is added to the slurry, the adding rate is controlled to be 10-15 g / min, stirring is continued for 20-30 minutes, and the material is discharged to obtain a noise reduction coating for the interior walls of the building.

[0058] The beneficial effects of the present invention are:

[0059] By compounding grade 1 sodium silicate crystals (size 100-500 microns) with nano-silicon dioxide (4-6 nanometers), a multi-scale pore structure (micrometer-level pores + nano-level filling) is formed, which significantly improves the coating's ability to absorb low-frequency sound waves (the sound absorption coefficient NRC can reach 0.8-0.9). Grade 1 sodium silicate crystals are screened and treated with activated carbon for multiple times to improve crystal purity, and the water absorption multiple (3.0-5.0) and water absorption amount (2000-3000ppm) are controllable, thus avoiding cracking or shedding of the coating due to moisture absorption and expansion. Secondly, the composite silicone gel has stable performance and is non-toxic and harmless, ensuring the environmental friendliness of the coating.

[0060] Porous structure and dual functions of sound insulation and heat insulation: Carbon nanotubes and silicon carbide form a three-dimensional network skeleton, combined with the silica coating generated by the hydrolysis of tetraethyl orthosilicate. The material has a porosity of 80%-85%, and has both sound absorption (noise reduction ≥ 35dB) and heat insulation (thermal conductivity ≤ 0.05W / (m·K)) properties. High-temperature calcination under nitrogen protection (400℃-450℃) and secondary calcination in air atmosphere (600℃-700℃) form a carbon-silicon composite skeleton. The coating hardness reaches more than 4H, and the wear resistance is improved by 50%.

[0061] The application of porous powder, the synergistic effect of diatomaceous earth (porous structure) + kaolin (lamellar structure) + calcite (damping vibration) broadens the sound absorption band (covering 100Hz-5000Hz), and its natural mineral raw materials account for more than 70%, and the cost is reduced by 40%-50% compared with traditional aerogel sound-absorbing coatings. DETAILED DESCRIPTION

[0062] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without creative work should fall within the scope of protection of the present invention.

[0063] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0064] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments. Example 1

[0065] The first embodiment of the present invention provides a noise reduction coating for interior walls of a building. The raw materials for preparing the coating include, by weight,

[0066] 80 parts of composite silicone gel;

[0067] 80 parts of porous powder;

[0068] 20 parts of high poly silicon carbon;

[0069] 0.5 parts of dispersant;

[0070] 40 parts of silica sol;

[0071] 10 parts of additives;

[0072] 0.1 parts pH adjuster.

[0073] The raw materials of the high-poly silicon carbon include, by weight,

[0074] 10 parts of carbonaceous materials;

[0075] 10 parts of silicon carbide;

[0076] 20 parts of carbon nanotubes;

[0077] 1 part carboxymethyl cellulose;

[0078] 2 parts of dodecyl dimethyl amine oxide;

[0079] 100 parts ethanol.

[0080] The raw materials of the porous powder include, by weight,

[0081] 6 parts kaolin;

[0082] 2 parts diatomaceous earth;

[0083] 1 part mica powder;

[0084] 2 parts calcite.

[0085] The raw materials of the composite silica gel include, by weight,

[0086] 3 parts of first grade sodium silicate crystals;

[0087] 0.2 parts of nano silicon dioxide;

[0088] 20 parts deionized water.

[0089] The method for preparing the first-grade sodium silicate crystals comprises the following steps:

[0090] Step 1.1, sieve the grade 3 sodium silicate crystals with a sieve with an aperture of 20 microns, and take the sieve residue for later use;

[0091] Step 1.2, mix 1 part of the sieve residue, 0.25 parts of polyacrylamide, 1 part of disodium hydrogen phosphate and 1000 parts of deionized water, control the temperature to 50°C, and stir to disperse evenly;

[0092] Step 1.3, adjust the pH value to 6 with hydrochloric acid, add 1 part of sodium gluconate, and treat with ultrasound for 15 minutes;

[0093] Step 1.4, add 0.02 parts of activated carbon, let it stand for 24 hours, and perform a second screening with a sieve with a pore size of 20 microns;

[0094] Step 1.5: Repeat steps 1.2 to 1.4 three times with the sieved material obtained from the second screening, and wash the sieved material twice with deionized water until the pH value of the washing solution is neutral, thereby obtaining first-grade sodium silicate crystals.

[0095] The method for preparing high-poly silicon carbon comprises the following steps:

[0096] The carbonaceous material, silicon carbide, carbon nanotubes, carboxymethyl cellulose, dodecyl dimethyl amine oxide and ethanol are mixed and stirred to prepare a reaction mixture;

[0097] 10 parts of 40% silicon hydroxide solution were added into the reactor at a rate of 1 ml / min through a peristaltic pump, the temperature was controlled at 40°C, and stirred for 15 minutes;

[0098] A mixture of 10 parts of ethyl orthosilicate and 15 parts of a 40% by mass silicon hydroxide solution was continuously added to the reactor at a rate of 8 ml / min through a peristaltic pump, stirred for 50 minutes, and then allowed to stand for 10 hours;

[0099] Filter and wash with anhydrous ethanol three times, and dry at 80℃;

[0100] The mixture was placed in a muffle furnace and heated from room temperature to 400°C at a rate of 1°C / min, calcined for 2 hours under nitrogen protection, ball-milled and sieved after cooling to room temperature to obtain high-polysilicon carbon;

[0101] Among them, the carbonaceous material is activated carbon.

[0102] The method for preparing the porous powder comprises the following steps:

[0103] Premix 2 parts diatomaceous earth and 3 parts water at 35°C for 10-15 minutes;

[0104] Add 2 parts of calcite, 6 parts of kaolin and 1 part of mica powder and continue premixing for 10 minutes;

[0105] The mixture was ball milled for 40 minutes at a speed of 300 r / min to obtain porous powder. Example 2

[0106] This embodiment provides a noise reduction coating for interior walls of a building. The raw materials for preparing the coating include, by weight,

[0107] 85 parts of composite silicone gel;

[0108] 85 parts of porous powder;

[0109] 25 parts of high poly silicon carbon;

[0110] 0.7 parts of dispersant;

[0111] 45 parts of silica sol;

[0112] 15 parts of additives;

[0113] 1 part pH adjuster.

[0114] The raw materials of the high-poly silicon carbon include, by weight,

[0115] 15 parts of carbonaceous materials;

[0116] 15 parts of silicon carbide;

[0117] 25 parts of carbon nanotubes;

[0118] 1 part carboxymethyl cellulose;

[0119] 2 parts of dodecyl dimethyl amine oxide;

[0120] 150 parts ethanol.

[0121] The raw materials of the porous powder include, by weight,

[0122] 7 parts kaolin;

[0123] 3 parts diatomaceous earth;

[0124] 1 part mica powder;

[0125] 3 parts calcite.

[0126] The raw materials of the composite silica gel include, by weight,

[0127] 4 parts of first grade sodium silicate crystals;

[0128] 0.3 parts of nano silicon dioxide;

[0129] 35 parts deionized water.

[0130] The method for preparing the first-grade sodium silicate crystals comprises the following steps:

[0131] Step 1.1, sieve the grade 3 sodium silicate crystals with a sieve with an aperture of 20 microns, and take the sieve residue for later use;

[0132] Step 1.2, mix 1 part of the sieve residue, 0.25 parts of polyacrylamide, 1 part of disodium hydrogen phosphate and 1000 parts of deionized water, control the temperature to 55°C, and stir to disperse evenly;

[0133] Step 1.3, adjust the pH value to 6 with hydrochloric acid, add 1 part of sodium gluconate, and treat with ultrasound for 20 minutes;

[0134] Step 1.4, add 0.02 parts of activated carbon, let it stand for 24 hours, and perform a second screening with a sieve with a pore size of 20 microns;

[0135] Step 1.5: Repeat steps 1.2 to 1.4 three times with the sieved material obtained from the second screening, and wash the sieved material twice with deionized water until the pH value of the washing solution is neutral, thereby obtaining first-grade sodium silicate crystals.

[0136] The method for preparing high-poly silicon carbon comprises the following steps:

[0137] The carbonaceous material, silicon carbide, carbon nanotubes, carboxymethyl cellulose, dodecyl dimethyl amine oxide and ethanol are mixed and stirred to prepare a reaction mixture;

[0138] 15 parts of 40% silicon hydroxide solution were added into the reactor at a rate of 1 ml / min through a peristaltic pump, the temperature was controlled at 40°C, and stirred for 15 minutes;

[0139] A mixture of 15 parts of ethyl orthosilicate and 15 parts of a 40% by mass silicon hydroxide solution was continuously added to the reactor at a rate of 8 ml / min through a peristaltic pump, stirred for 50 minutes and then allowed to stand for 10 hours;

[0140] Filter and wash with anhydrous ethanol three times, and dry at 80℃;

[0141] The mixture was placed in a muffle furnace and heated from room temperature to 400°C at a rate of 1°C / min, calcined for 2 hours under nitrogen protection, ball-milled and sieved after cooling to room temperature to obtain high-polysilicon carbon;

[0142] Among them, the carbonaceous material is activated carbon.

[0143] The method for preparing the porous powder comprises the following steps:

[0144] Premix 3 parts of diatomaceous earth and 4 parts of water at 35°C for 10-15 minutes;

[0145] Add 3 parts of calcite, 7 parts of kaolin and 1 part of mica powder and continue premixing for 10 minutes;

[0146] The mixture was ball milled for 50 minutes at a rotation speed of 400 r / min to obtain porous powder. Example 3

[0147] This embodiment provides a noise reduction coating for interior walls of a building. The raw materials for preparing the coating include, by weight,

[0148] 90 parts of composite silicone gel;

[0149] 90 parts of porous powder;

[0150] 30 parts of high poly silicon carbon;

[0151] 1 part dispersant;

[0152] 50 parts of silica sol;

[0153] 20 parts of additives;

[0154] 2 parts pH adjuster.

[0155] The raw materials of the high-poly silicon carbon include, by weight,

[0156] 20 parts of carbonaceous materials;

[0157] 20 parts of silicon carbide;

[0158] 40 parts of carbon nanotubes;

[0159] 2 parts carboxymethyl cellulose;

[0160] 3 parts of dodecyl dimethyl amine oxide;

[0161] 200 parts ethanol.

[0162] The raw materials of the porous powder include, by weight,

[0163] 9 parts kaolin;

[0164] 4 parts diatomaceous earth;

[0165] 2 parts mica powder;

[0166] 5 parts calcite.

[0167] The raw materials of the composite silica gel include, by weight,

[0168] 5 parts of first grade sodium silicate crystals;

[0169] 0.4 parts of nano silicon dioxide;

[0170] 50 parts deionized water.

[0171] The method for preparing the first-grade sodium silicate crystals comprises the following steps:

[0172] Step 1.1, sieve the grade 3 sodium silicate crystals with a sieve with an aperture of 20 microns, and take the sieve residue for later use;

[0173] Step 1.2, mix 1 part of the sieve residue, 0.25 parts of polyacrylamide, 2 parts of disodium hydrogen phosphate and 1000 parts of deionized water, control the temperature to 60°C, and stir to disperse evenly;

[0174] Step 1.3, adjust the pH value to 7 with hydrochloric acid, add 1 part of sodium gluconate, and treat with ultrasound for 20 minutes;

[0175] Step 1.4, add 0.02 parts of activated carbon, let it stand for 24 hours, and perform a second screening with a sieve with a pore size of 20 microns;

[0176] Step 1.5: Repeat steps 1.2 to 1.4 three times with the sieved material obtained from the second screening, and wash the sieved material twice with deionized water until the pH value of the washing solution is neutral, thereby obtaining first-grade sodium silicate crystals.

[0177] The method for preparing high-poly silicon carbon comprises the following steps:

[0178] The carbonaceous material, silicon carbide, carbon nanotubes, carboxymethyl cellulose, dodecyl dimethyl amine oxide and ethanol are mixed and stirred to prepare a reaction mixture;

[0179] 20 parts of 40% silicon hydroxide solution were added into the reactor at a rate of 1 ml / min through a peristaltic pump, the temperature was controlled at 50°C, and stirred for 20 minutes;

[0180] A mixture of 20 parts of ethyl orthosilicate and 15 parts of a 40% by mass silicon hydroxide solution was continuously added to the reactor at a rate of 8 ml / min through a peristaltic pump, stirred for 50 minutes, and then allowed to stand for 10 hours;

[0181] Filter and wash with anhydrous ethanol three times, and dry at 90℃;

[0182] The mixture was placed in a muffle furnace and heated from room temperature to 450°C at a rate of 1°C / min, calcined for 2 hours under nitrogen protection, cooled to room temperature, ball-milled, and sieved to obtain high-polysilicon carbon.

[0183] Among them, the carbonaceous material is activated carbon.

[0184] The method for preparing the porous powder comprises the following steps:

[0185] Premix 4 parts of diatomaceous earth and 4 parts of water at 35°C for 10-15 minutes;

[0186] Add 5 parts of calcite, 9 parts of kaolin and 2 parts of mica powder and continue premixing for 15 minutes;

[0187] The mixture was ball milled for 60 minutes at a rotation speed of 500 r / min to obtain porous powder.

[0188] Compare Examples 1 to 3, verify through experiments, and obtain experimental data, as shown in Table 1:

[0189] Table 1: Composition performance table of Example 1 to Example 3

[0190]

[0191] When testing the sound absorption coefficient, the reverberation time in an empty room is first measured, then the material to be tested is placed in the reverberation room, and the new reverberation time is measured again. The sound absorption coefficient is calculated according to the Sabin formula, and finally the experimental data is obtained.

[0192] When testing the compressive strength, prepare a sample of standard size and ensure its surface is flat. Apply a gradually increasing load on the press until the sample breaks. Record the maximum load and calculate the compressive strength based on the cross-sectional area of ​​the sample.

[0193] When testing water resistance, seal the edges of the coated sample with a solution of wax and rosin (1:1), and apply a layer of paraffin on the back to prevent moisture from penetrating from the side. Immerse half of the treated sample in cold water at a temperature of 25±1℃ for 24 hours, take out the sample, and observe whether there is bubbling, peeling, discoloration, etc., so as to evaluate the water resistance of the coating.

[0194] When testing the construction viscosity, use a specific type of paint cup (such as the Tu-4 cup). These cups have a specified outflow aperture size. First, measure the paint liquid temperature, then fill the paint cup with the paint sample. When the finger blocking the cup mouth is released, start timing, and the time until the paint sample stops flowing out is the viscosity value of the paint.

[0195] Comparative Example 1: The composite of the first-grade sodium silicate crystals and nano-silicon dioxide of Examples 1 to 3 is not used, and the specific raw material ratio is:

[0196] 90 parts of composite silica gel, 90 parts of porous powder, 30 parts of high-polysilicon carbon, 1 part of dispersant, 50 parts of silica sol, and 20 parts of additives.

[0197] Among them, the raw materials of the composite silica gel are 5 parts of sodium silicate crystals (without multiple screening and activated carbon adsorption treatment), 0.4 parts of nano-silicon dioxide, and 50 parts of deionized water.

[0198] Comparative Example 2: Only the first-grade sodium silicate crystals or nano silicon dioxide of Examples 1 to 3 are used, and the specific raw material ratio is:

[0199] 90 parts of composite silica gel, 90 parts of porous powder, 30 parts of high-polysilicon carbon, 1 part of dispersant, 50 parts of silica sol, and 20 parts of additives.

[0200] The raw materials of the composite silica gel are 5 parts of first-grade sodium silicate crystals and 50 parts of deionized water (without adding nano-silicon dioxide).

[0201] In Comparative Example 1, since a multi-scale pore structure is not formed, the coating has a weak absorption capacity for low-frequency sound waves, and the sound absorption coefficient NRC can only reach 0.6-0.7, which is lower than 0.8-0.9 of Examples 1 to 3. Secondly, the purity of sodium silicate crystals that have not been screened and treated with activated carbon for multiple times is low, and the water absorption multiple and water absorption amount are uncontrollable. The coating is prone to cracking or falling off due to moisture absorption and expansion, and the performance stability of the composite silicone gel is poor, and it may contain certain harmful substances, and its environmental protection is not as good as Examples 1 to 3.

[0202] In Comparative Example 2, the absorption capacity of low-frequency sound waves is limited by the micron-sized pores of the first-grade sodium silicate crystals, and the sound absorption coefficient NRC is 0.7-0.8, which is lower than the composite structure effect of the medium-sized micron-sized pores and nano-sized filling in Examples 1 to 3. Although the first-grade sodium silicate crystals have been sieved and treated with activated carbon adsorption for many times, and have high purity and controllable water absorption multiple and water absorption amount, they lack the synergistic effect of nano-silica, and the overall performance stability of the composite silica gel is still lower than the technical solutions of Examples 1 to 3.

[0203] Table 2: Experimental data table of Example 1, Comparative Example 1 and Comparative Example 2

[0204]

[0205] When testing the anti-porosity, nitrogen adsorption-desorption isotherm is used. The specific steps are to degas the sample at a certain temperature, then gradually adsorb nitrogen onto the sample surface at liquid nitrogen temperature, and calculate the specific surface area and porosity of the sample according to the BET theory by measuring the adsorption amount under different relative pressures;

[0206] The porosity of Example 1 is 80%-85%, that of Comparative Example 1 is 70%-75%, and that of Comparative Example 2 is 75%-80%. This shows that the porous structure of Example 1 is more developed, which is conducive to sound absorption and heat insulation. The higher the porosity, the larger the air volume inside the material, and the easier it is for sound waves to be absorbed and scattered during propagation, thereby improving the sound absorption performance; at the same time, the thermal conductivity of air is low, and a large number of pores can effectively reduce the thermal conductivity of the material and enhance the thermal insulation effect.

[0207] When testing the noise reduction, the reverberation chamber method is used according to the ASTM C423 standard. The sample is installed on the wall of the reverberation chamber, broadband noise is emitted by a speaker, and the reverberation time of the reverberation chamber before and after the sample is installed is measured. The sound absorption coefficient is calculated based on the change in the reverberation time, and the noise reduction is then obtained.

[0208] The noise reduction of Example 1 is ≥35dB, that of Comparative Example 1 is 20-25dB, and that of Comparative Example 2 is 25-30dB. This shows that the sound absorption performance of Example 1 is significantly better than that of the comparative example, and can reduce noise more effectively. The greater the noise reduction, the stronger the material's ability to absorb and attenuate sound waves, and the better it can improve the indoor sound environment.

[0209] When testing thermal conductivity, the heat flow meter method is used in accordance with ASTM C518. The sample is placed between the cold plate and the hot plate of the heat flow meter, the temperature difference between the two plates is controlled, the heat flow through the sample is measured, and the thermal conductivity is calculated according to Fourier's law;

[0210] The thermal conductivity of Example 1 is ≤0.05 W / (m·K), that of Comparative Example 1 is 0.07-0.08 W / (m·K), and that of Comparative Example 2 is 0.07-0.08 W / (m·K). This indicates that the thermal insulation performance of Example 1 is superior, and can effectively prevent the transfer of heat and reduce the energy consumption of the building. The lower the thermal conductivity, the better the thermal insulation performance of the material, and the slower the speed of heat transfer through the material, which helps to maintain the stability of the indoor temperature. Example 4

[0211] This embodiment also provides that the size of the first-grade sodium silicate crystal is 100 microns, the water absorption multiple is 3.0, and the water absorption amount is 2000 ppm; the particle size of the nano silicon dioxide is 4 nanometers.

[0212] The dispersant is fatty alcohol polyoxyethylene ether;

[0213] The pH regulator is citric acid;

[0214] The auxiliary agent includes a defoaming agent;

[0215] The dispersed phase particle size of silicon dioxide in the silica sol is 10 nanometers. Example 5

[0216] This embodiment also provides a method for preparing a noise reduction coating for an interior wall of a building, comprising the following steps:

[0217] 3 parts of first-grade sodium silicate crystals and 0.2 parts of nano-silicon dioxide were mixed at 50°C for 60 minutes, the rotation speed was controlled at 60r / min, 20 parts of deionized water were added dropwise at a speed of 2ml / min, and stirring was continued for 50 minutes to obtain a composite silica gel;

[0218] 80 parts of composite silica gel and 80 parts of porous powder were placed in a reaction container, stirred at a speed of 500 r / min for 10 minutes, and 3 parts of high-polysilicon carbon were added every 2 minutes to obtain a powder mixture;

[0219] pH regulator and dispersant were added dropwise to the powder mixture at a rate of 1 ml / min, and 40 parts of silica sol and 10 parts of additives were added at the same time, and stirred at a rate of 500 r / min for 20 minutes to prepare a slurry;

[0220] The remaining high-poly silicon carbon was added to the slurry, the adding rate was controlled to be 10 g / min, stirring was continued for 20-30 minutes, and the noise reduction coating for the interior walls of the building was obtained by discharging the material.

[0221] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A noise reduction coating for interior walls of a building, characterized in that: The raw materials for preparing the coating include, by weight, 80-90 parts of composite silicone gel; 80-90 parts of porous powder; 20-30 parts of high poly silicon carbon; 0.5-1 part dispersant; 40-50 parts of silica sol; 10-20 parts of additives; 0.1-2 parts of pH adjuster; The raw materials of the high-poly silicon carbon include by weight: 10-20 parts of carbonaceous material; 10-20 parts of silicon carbide; 20-40 parts of carbon nanotubes; 1-2 parts of carboxymethyl cellulose; 2-3 parts of dodecyl dimethyl amine oxide; 100-200 parts of ethanol; The raw materials of the composite silica gel include, by weight, 3-5 parts of first-grade sodium silicate crystals; 0.2-0.4 parts of nano silicon dioxide; 20-50 parts of deionized water; The preparation method of the first-grade sodium silicate crystals comprises the following steps: Step 1.1, sieve the grade 3 sodium silicate crystals with a sieve with an aperture of 20 microns, and take the sieve residue for later use; Step 1.2, mix 1 part of the sieve residue, 0.25 parts of polyacrylamide, 1-2 parts of disodium hydrogen phosphate and 1000 parts of deionized water, control the temperature to 50°C-60°C, and stir to disperse evenly; Step 1.3, adjust the pH value to 6-7 with hydrochloric acid, add 1 part of sodium gluconate, and treat with ultrasound for 15-20 minutes; Step 1.4, add 0.02 parts of activated carbon, let it stand for 24 hours, and perform a second screening with a sieve with a pore size of 20 microns; Step 1.5, repeating steps 1.2 to 1.4 three times with the sieved material obtained from the second screening, washing the sieved material with deionized water for 2-5 times until the pH value of the washing solution is neutral, to obtain first-grade sodium silicate crystals; The preparation method of the high-poly silicon carbon comprises the following steps: The carbonaceous material, silicon carbide, carbon nanotubes, carboxymethyl cellulose, dodecyl dimethyl amine oxide and ethanol are mixed and stirred to prepare a reaction mixture; Use 10-20 parts of 40% silicon hydroxide solution by mass percentage, add it into the reactor at a speed of 1-2 ml / min through a peristaltic pump, control the temperature at 40°C-50°C, and stir for 15-20 minutes; A mixture of 10-20 parts of ethyl orthosilicate and 15-25 parts of a 40% by mass silicon hydroxide solution is continuously added to the reactor at a rate of 8 ml / min through a peristaltic pump, stirred for 50 minutes, and then allowed to stand for 9-10 hours; Filter and wash with anhydrous ethanol 3-5 times, and dry at 80℃-90℃; Place in a muffle furnace and heat from room temperature to 400-450°C at a rate of 1°C / min, calcine for 2-3 hours under nitrogen protection, and then ball mill and sieve after cooling to room temperature to obtain high-poly silicon carbon; Wherein, the carbonaceous material is activated carbon; The size of the first-grade sodium silicate crystals is 100-500 microns, the water absorption multiple is 3.0-5.0, and the water absorption amount is 2000-3000 ppm; the particle size of the nano silicon dioxide is 4-6 nanometers.

2. The noise reduction coating for interior walls of a building as claimed in claim 1, characterized in that: The raw materials of the porous powder include, by weight, 6-9 parts of kaolin; 2-4 parts diatomaceous earth; 1-2 parts mica powder; 2-5 parts calcite.

3. The noise reduction coating for interior walls of a building as claimed in claim 2, characterized in that: The method for preparing the porous powder comprises the following steps: Premix diatomaceous earth and water at 35°C for 10-15 minutes; Add calcite, kaolin and mica powder and continue premixing for 10-15 minutes; The mixture is ball-milled for 40-60 minutes at a rotation speed of 300-500 r / min to obtain a porous powder.

4. The noise reduction coating for interior walls of a building as claimed in claim 3, characterized in that: The dispersant is fatty alcohol polyoxyethylene ether; The pH regulator is citric acid; The auxiliary agent includes at least one of a defoamer, a leveling agent, a matting agent and a wetting agent; The dispersed phase particle size of silicon dioxide in the silica sol is 5-20 nanometers.

5. A method for preparing a noise reduction coating for interior walls of a building, used for preparing the noise reduction coating for interior walls of a building according to any one of claims 1 to 4, characterized in that: The following steps are included: Mix 3-5 parts of first-grade sodium silicate crystals and 0.2-0.4 parts of nano-silicon dioxide at 50° C. for 60 minutes, control the rotation speed to 60-80 r / min, add 20-50 parts of deionized water at a speed of 1-2 ml / min, and continue stirring for 40-60 minutes to obtain a composite silica gel; Put 80-90 parts of composite silica gel and 80-90 parts of porous powder into a reaction container, stir at a speed of 500 r / min for 10-15 minutes, and add 3-5 parts of high-polysilicon carbon every 2 minutes to obtain a powder mixture; pH regulator and dispersant are added dropwise to the powder mixture at a rate of 1-2 ml / min, and 40-50 parts of silica sol and 10-20 parts of additives are added at the same time, and stirred at a rate of 500 r / min for 20-30 minutes to obtain a slurry; The remaining high-poly silicon carbon is added to the slurry, the adding rate is controlled to be 10-15 g / min, stirring is continued for 20-30 minutes, and the material is discharged to obtain a noise reduction coating for the interior walls of the building.

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