A sound insulation coating, its preparation method and a sound insulation coating

Abstract

The present invention provides a sound insulation coating, a preparation method thereof and a sound insulation coating. The sound insulation coating of the present invention comprises a styrene-acrylic emulsion, an inorganic filler, an organic sound insulation filler, a porous drying accelerating filler and a drainage drying accelerating fiber, and the organic sound insulation filler comprises at least one of acrylonitrile-butadiene rubber powder, ethylene-propylene rubber powder, polyurethane powder, acrylonitrile foamed microspheres, polyvinylidene chloride foamed microspheres and acrylate foamed microspheres. The present invention also provides a preparation method of the sound insulation coating and a sound insulation coating.

Description

Technical Field

[0001] The invention belongs to the technical field of coatings, and in particular relates to a sound insulation coating and a preparation method thereof, and a sound insulation coating. Background Art

[0002] With the development of green buildings, people's requirements for the building sound environment are constantly increasing. In GB / T 50378-2019 "Green Building Evaluation Standard", the two-star and three-star requirements for the impact sound of the household floor are less than 70dB and less than 65dB respectively. The poor sound insulation of the residential floor, especially the poor impact sound insulation, is a problem that has not been effectively solved for a long time. At present, the floor of rough housing basically does not meet the requirements, and even the decoration of the house with conventional wood flooring is difficult to meet the requirements of floor impact sound insulation. If the residents carry out secondary decoration on the basis of this floor, and choose surface materials such as granite and all-ceramic floor tiles, there is basically no improvement effect on the impact sound insulation of the floor, and it may even lead to a decrease in sound insulation performance. Studies have shown that when the noise level reaches 60dB~65dB, it will significantly increase people's annoyance. The noise environment exceeding 65dB will seriously affect people's quality of life and may lead to changes in behavior.

[0003] The impact sound in a house is caused by the impact source hitting the floor, which vibrates due to the impact. The vibration radiates sound energy to the receiving space through the rigid structure of the house to form air sound and transmit it to the receiver. The main measures for sound insulation treatment of impact sound include vibration source control, vibration blocking and sound radiation reduction. Building sound insulation methods include sound insulation pads, sound insulation mortar, sound insulation polystyrene boards and sound insulation coatings. Sound insulation coatings use damping materials and elastic materials to absorb or compress and store the energy received, so that the sound waves are blocked or converted into heat energy, which can effectively improve the sound insulation performance of the impact sound and air sound of the floor. Sound insulation coatings are easy to construct, thin in thickness, good in sound insulation performance and low in cost, and have broad application prospects in the field of building sound insulation.

[0004] Sound insulation coating is a thick coating, which needs to reach a certain thickness to play a sound insulation role. In the related art, this type of sound insulation coating often has the problems of long drying time and poor crack resistance. Summary of the invention

[0005] The present invention aims to solve at least one of the above technical problems existing in the prior art. To this end, the present invention provides a sound insulation coating, which dries quickly and has good coating performance.

[0006] The invention also provides a method for preparing the sound insulation coating.

[0007] The invention also provides a sound insulation coating.

[0008] The first aspect of the present invention provides a sound insulation coating, the components of which include styrene-acrylic emulsion, inorganic matrix filler, organic sound insulation filler, porous drying accelerator filler and drainage drying accelerator fiber, and the organic sound insulation filler includes at least one of nitrile rubber powder, ethylene-propylene rubber powder, polyurethane powder, acrylonitrile foamed microbeads, polyvinylidene chloride foamed microbeads and acrylate foamed microbeads.

[0009] Generally, for a sound insulation coating with a coating thickness of 3 mm, the drying time of the wet film requires 48 h. To ensure the crack resistance requirement of the coating, for a 5-mm-thick coating, the sound insulation coating often needs to be applied in 2-3 layers. The long drying time of the coating will lead to problems such as a long construction period for thick coating and poor quality stability, affecting the user experience. Specifically:

[0010] The dry film thickness of the sound insulation coating is usually 3 mm to 5 mm. During thick coating construction, there is an obvious difference in the drying speed between the surface and the bottom layer, resulting in a large time difference between the film formation on the surface layer and the bottom layer. The drying and film formation of the bottom layer lag behind that of the surface layer, causing the bottom layer to shrink in volume during drying. At this time, the strength of the surface dry film is relatively low, which is likely to cause cracking of the surface dry film. In addition, a dense dry film is formed on the surface layer after construction, which will inhibit the volatilization of the solvent inside the coating, resulting in a decrease in the drying rate of the coating and a longer construction period. The present invention constructs a microscopic porous structure in the coating through the porous drying accelerator filler, avoiding the formation of a dense closed film layer on the surface of the coating, providing a channel for solvent volatilization, and accelerating the drying speed of the coating.

[0011] The drying time of the coating is long. The actual drying time of a 3-mm coating usually exceeds 48 h. To improve the sound insulation effect, a 5-mm-thick coating needs to be constructed, usually in 2-3 layers. Coupled with the long drying time, the construction period is long and the construction is very inconvenient. Through the adsorption effect of the drainage drying accelerator fiber, the present invention utilizes the one-dimensional long-range structure of the fiber to construct a static drainage channel from the bottom layer to the surface layer, improving the solvent volatilization speed of the bottom layer of the coating and promoting the film formation of the coating. The drainage drying accelerator fiber can improve the uniformity of the solvent water distribution inside the coating, prevent the coating skin from forming a film too quickly, and further improve the volatilization rate of the solvent. In addition, delaying the film formation on the surface layer can also improve the crack resistance of the coating. When the skin forms a film too quickly, the volatilization of the solvent inside the coating causes volume shrinkage. At this time, the dry film strength of the skin is low, and internal shrinkage generates tensile stress, which is prone to cracking. The drainage drying accelerator fiber improves the consistency of the curing degree between the bottom layer and the surface layer of the coating, avoiding cracking of the low-strength surface film under the volume shrinkage stress generated during the subsequent drying of the bottom layer, and ultimately improving the crack resistance of the coating.

[0012] For the sound insulation coating of the present invention, tested according to Method C in the Determination of Drying Time of Paint Films and Putty Films (GB / T 1728-2020), the actual drying time of the coating is within 16 h, and the best state can reach within 8 h. Compared with the existing sound insulation coatings, the construction period can be shortened by more than 30 h.

[0013] Although some conventional sound insulation coatings can meet the requirements of green buildings, after laying decorative surfaces such as floor tiles, the sound insulation performance significantly decreases and cannot meet the sound insulation performance requirements in the completed state after laying the decorative surface. The sound insulation coating of the present invention, through styrene-acrylic emulsion, combines the high elasticity and viscoelastic damping effect of organic sound insulation fillers, improves the elasticity of the coating film after film formation, and thus obtains good sound insulation performance. The impact sound improvement amount reaches 20 dB - 30 dB. After laying the ceramic tile surface layer, the impact sound pressure level can be reduced to below 65 dB, which can not only meet the requirements of green buildings, but also significantly improve the user experience.

[0014] Among the components of the sound insulation coating:

[0015] The inorganic matrix fillers mainly play a role in volume filling. The density of the inorganic matrix fillers with a hollow structure is lower than that of common solid matrix fillers such as heavy calcium powder, barite powder, and mica powder. Under the condition of ensuring sufficient volume filling effect, the density of the coating can be reduced, the coating rate can be decreased, and the labor intensity of operators can be reduced.

[0016] The organic sound insulation fillers mainly play a role in vibration reduction and sound insulation. The organic sound insulation fillers are designed by matching solid damping fillers and hollow high-elastic fillers, and the weight ratio of the hollow high-elastic fillers to the solid damping fillers is 0.2 - 0.8:1. The hollow high-elastic fillers use the low elastic modulus of polymer materials to improve the elastic strain of the coating, and the solid damping fillers then use the viscoelastic damping effect to attenuate the vibration energy of the floor + coating system, playing a role in vibration reduction and sound insulation and obtaining good sound insulation effect.

[0017] The organic sound insulation fillers include at least one of nitrile rubber powder, ethylene-propylene rubber powder, polyurethane powder, acrylonitrile foamed microspheres, polyvinylidene chloride foamed microspheres, and acrylate foamed microspheres.

[0018] According to some embodiments of the present invention, the solid damping fillers in the organic sound insulation fillers include nitrile rubber powder, ethylene-propylene rubber powder, and polyurethane powder.

[0019] According to some embodiments of the present invention, the hollow high-elastic fillers in the organic sound insulation fillers include acrylonitrile foamed microspheres, polyvinylidene chloride foamed microspheres, and acrylate foamed microspheres.

[0020] The porous drying-promoting fillers mainly play a role in promoting drying. The porous drying-promoting fillers utilize the characteristics of porous and strong permeability to form a micro-porous coating film, prevent the formation of a dense closed film on the surface of the coating to inhibit the solvent volatilization, and reserve channels for the solvent volatilization. In addition, the porous polystyrene microspheres have better elasticity than diatomaceous earth and have a certain beneficial effect on the sound insulation performance of the coating.

[0021] The drainage and drying-promoting fiber mainly plays a role in promoting drying. The drainage and drying-promoting filler utilizes the one-dimensional long-range structure of the water-absorbing fiber to construct a static drainage channel from the bottom layer to the surface layer of the coating, improving the drying rate of the bottom layer coating and shortening the construction period.

[0022] According to some embodiments of the present invention, the solid content of the styrene-acrylic emulsion is 45%-55%.

[0023] When the solid content is lower than 45%, it will cause a decrease in the overall solid content of the coating, resulting in an increase in the volume shrinkage during the drying process of the coating, and an increase in the difference in the drying degree between the surface layer and the bottom layer, affecting the crack resistance of the coating; when the solid content is higher than 55%, it will cause an increase in the surface compactness of the coating, affecting the solvent volatilization of the coating.

[0024] According to some embodiments of the present invention, in the styrene-acrylic emulsion, the mass ratio of the soft monomer to the styrene group of the hard monomer is 20:4-7.

[0025] According to some embodiments of the present invention, in the styrene-acrylic emulsion, the mass ratio of the soft monomer to the styrene group of the hard monomer is 10:3.

[0026] The ratio of the soft monomer to the hard monomer has a great influence on the sound insulation performance of the coating. When the content of the soft monomer is high, the deformation ability of the coating is improved and the sound insulation performance is good. However, too high a content of the soft monomer will cause a decrease in the static load-bearing capacity of the coating. Therefore, 45%-55% is a suitable solid content range for the styrene-acrylic emulsion.

[0027] According to some embodiments of the present invention, the inorganic filler includes at least one of expanded vermiculite, perlite, and cenospheres.

[0028] According to some embodiments of the present invention, the particle size of the inorganic filler is 60-120 mesh.

[0029] According to some embodiments of the present invention, the porous drying-promoting filler includes at least one of diatomite and porous polystyrene microspheres.

[0030] According to some embodiments of the present invention, the particle size of the porous drying-promoting filler is 300-400 mesh.

[0031] According to some embodiments of the present invention, the drainage and drying-promoting fiber includes at least one of wood fiber, collagen fiber, and sepiolite fiber.

[0032] According to some embodiments of the present invention, the length of the drainage and drying-promoting fiber is 1-2 mm.

[0033] According to some embodiments of the present invention, by weight, the components include:

[0034] Styrene-acrylic emulsion: 100 parts,

[0035] Inorganic matrix filler: 10 parts to 25 parts,

[0036] Organic sound insulation filler: 30 parts to 100 parts,

[0037] Porous drying accelerator filler: 2.5 parts to 10 parts,

[0038] Drainage and drying accelerator fiber: 2.5 parts to 10 parts.

[0039] According to some embodiments of the present invention, the mass ratio of the drainage and drying accelerator fiber to the porous drying accelerator filler is 0.9 to 1.1:1.

[0040] The drainage and drying accelerator fiber and the porous drying accelerator filler have a synergistic effect of constructing a drainage channel for the solvent from the bottom layer to the surface layer and a microporous drying effect on the surface layer. The change in their ratio has a significant impact on the drying time and crack resistance of the coating. When there is too much porous drying accelerator filler, the surface drying is accelerated, and the drying of the bottom layer lags behind, easily resulting in superficial cracks; when there is too much drainage and drying accelerator fiber, the coating thickens, the solvent content needs to be increased, resulting in an increase in the water content of the coating, and volume shrinkage easily leads to cracking.

[0041] According to some embodiments of the present invention, the components further include hydroxyethyl cellulose, dispersant, defoamer, thickener, bactericide and solvent.

[0042] Hydroxyethyl cellulose mainly plays an initial thickening role.

[0043] According to some embodiments of the present invention, the viscosity specification of hydroxyethyl cellulose is 25000 mPa·s (20 °C, 2% aqueous solution) to 35000 mPa·s (20 °C, 2% aqueous solution).

[0044] According to some embodiments of the present invention, the viscosity specification of hydroxyethyl cellulose can be about 30000 mPa·s (20 °C, 2% aqueous solution).

[0045] According to some embodiments of the present invention, in terms of parts by weight, when the weight of the styrene-acrylic emulsion is 100 parts, the addition amount of the hydroxyethyl cellulose is 0.4 parts to 1 part.

[0046] According to some embodiments of the present invention, in terms of parts by weight, when the weight of the styrene-acrylic emulsion is 100 parts, the addition amount of the dispersant is 0.5 parts to 2 parts.

[0047] According to some embodiments of the present invention, the dispersant includes sodium polyacrylate dispersant.

[0048] According to some embodiments of the present invention, in terms of parts by weight, when the weight of the styrene-acrylic emulsion is 100 parts, the addition amount of the defoamer is 0.5 parts to 2 parts.

[0049] According to some embodiments of the present invention, the defoamer includes a mineral oil defoamer.

[0050] The defoamer can reduce the bubbles in the preparation and use of the coating, and reduce cracks.

[0051] According to some embodiments of the present invention, by weight, when the weight of the styrene-acrylic emulsion is 100 parts, the addition amount of the thickener is 0.25 parts to 1 part.

[0052] According to some embodiments of the present invention, by weight, the thickener includes a polyurethane thickener.

[0053] Adding a thickener can adjust the viscosity of the coating to the required viscosity for construction. Improve the construction and the use effect of the coating, and reduce cracks.

[0054] According to some embodiments of the present invention, by weight, when the weight of the styrene-acrylic emulsion is 100 parts, the addition amount of the bactericide is 0.25 parts to 1 part.

[0055] According to some embodiments of the present invention, the bactericide includes a Kathon bactericide.

[0056] The bactericide can improve the safety of users during use and avoid mildew.

[0057] According to some embodiments of the present invention, by weight, when the weight of the styrene-acrylic emulsion is 100 parts, the addition amount of the solvent is 50 parts to 75 parts.

[0058] According to some embodiments of the present invention, the solvent includes water.

[0059] The second aspect of the present invention provides a method for preparing the sound insulation coating described above, including the following steps: successively adding the hydroxyethyl cellulose, inorganic filler, styrene-acrylic emulsion, organic sound insulation filler, dispersant, defoamer, porous drying accelerator, drainage drying fiber, bactericide and thickener into the solvent and mixing them evenly to obtain the sound insulation coating described above.

[0060] One technical solution in the method for preparing the sound insulation coating according to the present invention has at least the following beneficial effects:

[0061] The method for preparing the sound insulation coating of the present invention does not require expensive equipment and complex process control, the reaction conditions are not harsh, the raw materials are easily available, the production cost is low, and it is easy to be industrially produced.

[0062] According to some embodiments of the present invention, the method includes the following steps:

[0063] S1: Add the hydroxyethyl cellulose to the solvent according to the ratio and stir at the first stirring rate.

[0064] S2: Add the inorganic filler, part of the dispersant and part of the defoamer, and stir at the second stirring rate.

[0065] S3: Add the styrene-acrylic emulsion and stir at the third stirring rate.

[0066] S4: Add the organic sound insulation filler, the remaining dispersant and the remaining defoamer, and stir at the third stirring rate.

[0067] S5: Add the porous drying accelerator filler and stir at the third stirring rate.

[0068] S6: Add the bactericide and stir at the third stirring rate.

[0069] S7: Add the drainage and drying accelerator fiber and stir at the third stirring rate.

[0070] According to some embodiments of the present invention, the first stirring rate is 300 rpm to 500 rpm.

[0071] According to some embodiments of the present invention, the second stirring rate is 1200 rpm to 1500 rpm.

[0072] According to some embodiments of the present invention, the third stirring rate is 800 rpm to 1200 rpm.

[0073] The third aspect of the present invention provides a sound insulation coating prepared from the sound insulation paint or the method described above.

[0074] One technical solution in the technical solution of the present invention regarding the sound insulation coating has at least the following beneficial effects:

[0075] The sound insulation coating of the present invention constructs a microscopic porous film layer through the porous drying accelerator functional filler, and combines the adsorption and drainage functions of the drying accelerator and drainage fiber to provide channels for the surface and solvent volatilization inside the paint. The drying time of the 3 mm wet film can be shortened to within 16 h, shortening the construction period of the paint by more than 30 h.

[0076] In the sound insulation coating of the present invention, the drainage and drying accelerator filler improves the uniformity of the distribution of the solvent and moisture inside the paint and inhibits the rapid film formation on the surface of the paint. This improves the consistency of the curing degree between the bottom layer and the surface layer of the paint, avoids cracking of the low-strength surface film under the volume shrinkage stress generated during the subsequent drying of the bottom layer, and improves the crack resistance of the paint.

[0077] The sound insulation coating of the present invention is formed by curing the quick-drying thick-coating sound insulation paint of the present invention. The thickness of a single construction can reach 6 mm to 7 mm, and it can be completed in one go, reducing the construction frequency.

[0078] The sound insulation coating of the present invention, through the damping effect of the polymer sound insulation functional filler of the organic sound insulation filler, combines the high elasticity of porous drying-promoting fillers such as porous polystyrene microspheres, improves the elasticity of the coating film after film formation, and thus obtains good sound insulation performance. The impact sound pressure level is reduced to 50 dB to 60 dB, and further leaves more sound insulation performance margin for the construction decorative surface layer, improving the sound insulation experience after completion.

[0079] According to some embodiments of the present invention, the thickness of the sound insulation coating is 3 mm to 8 mm.

[0080] The fourth aspect of the present invention provides a building precast member, which is characterized by including the sound insulation paint or the sound insulation coating described above.

[0081] One technical solution in the technical solution of the present invention regarding the building precast member has at least the following beneficial effects:

[0082] For the building precast member of the present invention, the sound insulation coating thereon, through the damping effect of the polymer sound insulation functional filler of the organic sound insulation filler, combines the high elasticity of porous drying-promoting fillers such as porous polystyrene microspheres, improves the elasticity of the coating film after film formation, and thus obtains good sound insulation performance. The impact sound pressure level is reduced to 50 dB to 60 dB, and further leaves more sound insulation performance margin for the construction decorative surface layer, improving the sound insulation experience of the building precast member.

[0083] Building precast members are usually referred to as "precast components" or "precast building components", which refer to building components produced in factories or prefabrication plants and having specific sizes, shapes and functions. Precast components are usually processed and manufactured in factories and then installed on site. The use of precast components can improve construction efficiency, quality control and reduce on-site construction time.

[0084] According to some embodiments of the present invention, the building precast member includes beams, columns, slabs, walls and stairs. Detailed implementation manners

[0085] The following are specific embodiments of the present invention, and the technical solutions of the present invention are further described in combination with the embodiments, but the present invention is not limited to these embodiments.

[0086] In some embodiments of the present invention, a sound insulation coating is provided, the components of which include styrene-acrylic emulsion, inorganic filler, organic sound insulation filler, porous drying accelerator filler and drainage drying accelerator fiber. The organic sound insulation filler includes at least one of nitrile rubber powder, ethylene-propylene rubber powder, polyurethane powder, acrylonitrile foamed microbeads, polyvinylidene chloride foamed microbeads and acrylate foamed microbeads.

[0087] It should be noted that generally, for a sound insulation coating with a coating thickness of 3 mm, the drying time of the wet film requires 48 h. To ensure the anti-cracking requirement of the coating, for a 5-mm-thick coating, the sound insulation coating often needs to be applied in 2-3 coats. The long drying time of the coating will lead to problems such as a long construction period for thick coating and poor quality stability, affecting the user experience. Specifically:

[0088] It can be understood that the dry film thickness of the sound insulation coating is usually 3 mm to 5 mm. During thick coating construction, there is a significant difference in the drying speed between the surface and the bottom layer, resulting in a large time difference between the film formation on the surface layer and the bottom layer. The drying and film formation of the bottom layer lag behind that of the surface layer, causing the volume shrinkage of the dried bottom layer. At this time, the strength of the surface dry film is relatively low, which is likely to cause cracking of the surface dry film. In addition, a dense dry film is formed on the surface layer after construction, which will inhibit the volatilization of the solvent inside the coating, resulting in a decrease in the drying rate of the coating and a longer construction period. The present invention constructs a microscopic porous structure in the coating through the porous drying accelerator filler, avoiding the formation of a dense closed film layer on the surface of the coating, providing a channel for solvent volatilization, and accelerating the drying speed of the coating.

[0089] Furthermore, the drying time of the coating is long, and the actual drying time of a 3-mm coating usually exceeds 48 h. To improve the sound insulation effect, a 5-mm-thick coating needs to be constructed, usually requiring 2-3 coats. Coupled with the long drying time, the construction period is long and the construction is very inconvenient. Through the adsorption effect of the drainage drying accelerator fiber, the present invention constructs a static drainage channel from the bottom layer to the surface layer by utilizing the one-dimensional long-range structure of the fiber, improving the solvent volatilization speed of the bottom layer of the coating and promoting the film formation of the coating. The drainage drying accelerator fiber can improve the uniformity of the solvent water distribution inside the coating, prevent the coating skin from forming a film too quickly, and further improve the volatilization rate of the solvent. In addition, delaying the film formation on the surface layer can also improve the anti-cracking performance of the coating. When the coating skin forms a film too quickly, the volatilization of the solvent inside the coating causes volume shrinkage. At this time, the strength of the dry film on the skin is low, and internal shrinkage generates tensile stress, which is prone to cracking. The drainage drying accelerator fiber improves the consistency of the curing degree between the bottom layer and the surface layer of the coating, avoiding cracking of the low-strength surface film under the volume shrinkage stress generated during the subsequent drying of the bottom layer, and finally improving the anti-cracking performance of the coating.

[0090] It should be noted that for the sound insulation coating of the present invention, when tested according to Method C in the Determination Method for Drying Time of Paint Films and Putty Films (GB / T 1728-2020), the actual drying time of the coating is within 16 hours, and the best state can reach within 8 hours. Compared with the existing sound insulation coatings, the construction period can be shortened by more than 30 hours.

[0091] Although some conventional sound insulation coatings can meet the requirements of green buildings, after laying decorative surfaces such as floor tiles, the sound insulation performance decreases significantly and cannot meet the sound insulation performance requirements in the completed state after laying the decorative surface. The sound insulation coating of the present invention, through styrene-acrylic emulsion, combines the high elasticity and viscoelastic damping effect of organic sound insulation fillers, improves the elasticity of the coating film after film formation, and thus obtains good sound insulation performance. The improvement amount of impact sound reaches 20 dB - 30 dB. After laying the ceramic tile surface layer, the impact sound pressure level can be reduced to below 65 dB, which can not only meet the requirements of green buildings, but also significantly improve the user experience.

[0092] It should be noted that in the components of the sound insulation coating:

[0093] Inorganic matrix fillers mainly play a role in volume filling. The density of inorganic matrix fillers with a hollow structure is lower than that of common solid matrix fillers such as heavy calcium powder, barite powder, and mica powder. Under the condition of ensuring sufficient volume filling effect, the density of the coating can be reduced, the spreading rate can be decreased, and the labor intensity of operators can be reduced.

[0094] Organic sound insulation fillers mainly play a role in vibration reduction and sound insulation. Through the matching design of solid damping fillers and hollow high-elastic fillers, organic sound insulation fillers use the low elastic modulus of polymer materials to increase the elastic strain of the coating, and then use the viscoelastic damping effect to attenuate the vibration energy of the floor + coating system, playing a role in vibration reduction and sound insulation and obtaining good sound insulation effects.

[0095] Porous drying-promoting fillers mainly play a role in promoting drying. Using the characteristics of porous and strong permeability, porous drying-promoting fillers form a micro-porous coating film, preventing the formation of a dense closed film on the surface of the coating from inhibiting the volatilization of solvents and reserving channels for solvent volatilization. In addition, porous polystyrene microspheres have better elasticity than diatomaceous earth and have a certain beneficial effect on the sound insulation performance of the coating.

[0096] Drainage and drying-promoting fibers mainly play a role in promoting drying. Using the one-dimensional long-range structure of water-absorbing fibers, drainage and drying-promoting fillers construct a static drainage channel from the bottom layer to the surface layer of the coating, improving the drying rate of the bottom layer coating and shortening the construction period.

[0097] In some embodiments of the present invention, the solid content of the styrene-acrylic emulsion is 45% - 55%.

[0098] If the solid content is less than 45%, it will lead to a decrease in the overall solid content of the coating, which in turn will increase the volume shrinkage during the drying process of the coating, and the difference in the drying degree between the surface layer and the bottom layer will increase, affecting the crack resistance of the coating; if the solid content is higher than 55%, it will lead to an increase in the surface denseness of the coating, affecting the solvent volatilization of the coating.

[0099] In some embodiments of the present invention, in the styrene-acrylic emulsion, the mass ratio of the soft monomer to the styrene group of the hard monomer is 20:4 to 7.

[0100] In some embodiments of the present invention, in the styrene-acrylic emulsion, the mass ratio of the soft monomer to the styrene group of the hard monomer is 10:3.

[0101] The ratio of the soft monomer to the hard monomer has a great influence on the sound insulation performance of the coating. When the content of the soft monomer is high, the deformation ability of the coating is improved and the sound insulation performance is good. However, if the content of the soft monomer is too high, it will lead to a decrease in the static load-bearing capacity of the coating. Therefore, 45%-55% is the appropriate solid content range of the styrene-acrylic emulsion.

[0102] In some embodiments of the present invention, the inorganic matrix filler includes at least one of expanded vermiculite, perlite, and cenospheres.

[0103] In some embodiments of the present invention, the particle size of the inorganic matrix filler is 60-120 mesh.

[0104] In some embodiments of the present invention, the porous drying-promoting filler includes at least one of diatomite and porous polystyrene microspheres.

[0105] In some embodiments of the present invention, the particle size of the porous drying-promoting filler is 300-400 mesh.

[0106] In some embodiments of the present invention, the drainage and drying-promoting fiber includes at least one of wood fiber, collagen fiber, and sepiolite fiber.

[0107] In some embodiments of the present invention, the length of the drainage and drying-promoting fiber is 1-2 mm.

[0108] In some embodiments of the present invention, by weight, the components include:

[0109] Styrene-acrylic emulsion: 100 parts,

[0110] Inorganic matrix filler: 10 parts to 25 parts,

[0111] Organic sound insulation filler: 30 parts to 100 parts,

[0112] Porous drying-promoting filler: 2.5 parts to 10 parts,

[0113] Drainage and drying-promoting fiber: 2.5 parts to 10 parts.

[0114] In some embodiments of the present invention, the mass ratio of the drainage and drying acceleration fiber to the porous drying acceleration filler is 0.9 to 1.1:1.

[0115] The drainage and drying acceleration fiber and the porous drying acceleration filler have a synergistic effect of constructing a drainage channel for the solvent from the bottom layer to the surface layer and a microporous drying acceleration on the surface layer. The change in their ratio has a significant impact on the drying time and crack resistance of the coating. When there is too much porous drying acceleration filler, the surface drying is accelerated, and the drying of the bottom layer lags behind, which is prone to superficial cracking; when there is too much drainage and drying acceleration fiber, the coating thickens, the solvent content needs to be increased, resulting in an increase in the water content of the coating, and volume shrinkage is prone to cause cracking.

[0116] In some embodiments of the present invention, the components further include hydroxyethyl cellulose, dispersant, defoamer, thickener, bactericide and solvent.

[0117] Hydroxyethyl cellulose mainly plays an initial thickening role.

[0118] In some embodiments of the present invention, the viscosity specification of hydroxyethyl cellulose is 25000 mPa·s (20 °C, 2% aqueous solution) to 35000 mPa·s (20 °C, 2% aqueous solution).

[0119] In some embodiments of the present invention, the viscosity specification of hydroxyethyl cellulose can be about 30000 mPa·s (20 °C, 2% aqueous solution).

[0120] In some embodiments of the present invention, by weight, when the weight part of styrene-acrylic emulsion is 100 parts, the addition amount of hydroxyethyl cellulose is 0.4 parts to 1 part.

[0121] In some embodiments of the present invention, by weight, when the weight part of styrene-acrylic emulsion is 100 parts, the addition amount of dispersant is 0.5 parts to 2 parts.

[0122] In some embodiments of the present invention, the dispersant includes sodium polyacrylate dispersant.

[0123] In some embodiments of the present invention, by weight, when the weight part of styrene-acrylic emulsion is 100 parts, the addition amount of defoamer is 0.5 parts to 2 parts.

[0124] In some embodiments of the present invention, the defoamer includes mineral oil defoamer.

[0125] The defoamer can reduce the bubbles in the preparation and use process of the coating and reduce cracks.

[0126] In some embodiments of the present invention, by weight, when the weight part of styrene-acrylic emulsion is 100 parts, the addition amount of thickener is 0.25 parts to 1 part.

[0127] In some embodiments of the present invention, based on parts by weight, the thickener includes a polyurethane thickener.

[0128] Adding a thickener can adjust the viscosity of the coating to the required level for construction, improve the construction and the use effect of the coating, and reduce cracks.

[0129] In some embodiments of the present invention, based on parts by weight, when the weight of the styrene-acrylic emulsion is 100 parts, the addition amount of the bactericide is 0.25 parts to 1 part.

[0130] In some embodiments of the present invention, the bactericide includes a Kathon bactericide.

[0131] The bactericide can improve the safety of users during use and prevent mildew.

[0132] In some embodiments of the present invention, based on parts by weight, when the weight of the styrene-acrylic emulsion is 100 parts, the addition amount of the solvent is 50 parts to 75 parts.

[0133] In some embodiments of the present invention, the solvent includes water.

[0134] In some other embodiments of the present invention, the present invention provides a method for preparing a sound insulation coating, including the following steps: successively adding the hydroxyethyl cellulose, inorganic filler, styrene-acrylic emulsion, organic sound insulation filler, dispersant, defoamer, porous drying accelerator, drainage drying fiber, bactericide and thickener into the solvent and mixing them evenly to obtain the sound insulation coating.

[0135] It can be understood that the preparation method of the sound insulation coating of the present invention does not require expensive equipment and complex process control, the reaction conditions are not harsh, the raw materials are easily available, the production cost is low, and it is easy to be industrially produced.

[0136] In some embodiments of the present invention, the method includes the following steps:

[0137] S1: According to the ratio, add hydroxyethyl cellulose into the solvent and stir at the first stirring rate;

[0138] S2: Add the inorganic filler, part of the dispersant and part of the defoamer and stir at the second stirring rate;

[0139] S3: Add the styrene-acrylic emulsion and stir at the third stirring rate;

[0140] S4: Add the organic sound insulation filler, the remaining dispersant and the remaining defoamer and stir at the third stirring rate;

[0141] S5: Add the porous drying accelerator and stir at the third stirring rate;

[0142] S6: Add the bactericide and stir at the third stirring rate;

[0143] S7: adding drainage-promoting fiber and stirring at the third stirring rate;

[0144] In some embodiments of the present invention, the first stirring rate is 300 rpm to 500 rpm.

[0145] In some embodiments of the present invention, the second stirring rate is 1200 rpm to 1500 rpm.

[0146] In some embodiments of the present invention, the third stirring rate is 800 rpm to 1200 rpm.

[0147] In some other embodiments of the present invention, the present invention provides a sound insulation coating, which is prepared by the sound insulation coating of the present invention or the method of the present invention.

[0148] It can be understood that the sound insulation coating of the present invention constructs a microscopic porous membrane layer through porous drying-promoting functional fillers, combines the adsorption and drainage functions of drying-promoting drainage fibers, constructs a surface inside the coating and provides channels for solvent volatilization, and the drying time of a 3mm wet film can be shortened to less than 16 hours, shortening the construction period of the coating by more than 30 hours.

[0149] In addition, in the sound insulation coating of the present invention, the drainage and drying-promoting filler improves the uniformity of the distribution of the solvent water inside the coating, and inhibits the coating from forming a film too quickly on the surface. This improves the consistency of the curing degree between the bottom layer and the surface layer of the coating, avoids the cracking of the low-strength surface film under the volume shrinkage stress generated in the subsequent bottom layer drying process, and improves the crack resistance of the coating.

[0150] The sound insulation coating of the present invention is formed by curing the quick-drying thick-coating sound insulation coating of the present invention. The thickness can reach 6 mm to 7 mm after one construction, and the coating can be completed in one construction, thereby reducing the construction frequency.

[0151] The sound insulation coating of the present invention improves the elasticity of the coating after film formation through the damping effect of the high molecular sound insulation functional filler of the organic sound insulation filler combined with the high elasticity of the porous drying-promoting filler such as porous polystyrene microspheres, thereby obtaining good sound insulation performance, and reducing the sound pressure level of impact sound to 50dB-60dB, thereby leaving more sound insulation performance margin for the construction of the decorative surface layer, and improving the sound insulation experience after completion.

[0152] In some embodiments of the present invention, the thickness of the sound insulation coating is 3 mm to 8 mm.

[0153] In some embodiments of the present invention, the thickness of the sound insulation coating can reach 6 mm to 7 mm.

[0154] In some other embodiments of the present invention, a prefabricated building component is provided, and the prefabricated building component includes the sound insulation paint or sound insulation coating of the present invention.

[0155] It can be understood that for the prefabricated building components of the present invention, the sound insulation coating thereon improves the elasticity of the coating film through the damping effect of the polymer sound insulation functional filler of the organic sound insulation filler and combines the high elasticity of the porous drying-promoting filler such as porous polystyrene microspheres, thereby obtaining good sound insulation performance. The impact sound pressure level is reduced to 50 dB to 60 dB, and further more sound insulation performance margin is reserved for the construction decorative surface layer, improving the sound insulation experience of the prefabricated building components.

[0156] It should be noted that prefabricated building components are usually referred to as "prefabricated components" or "prefabricated building components", which refer to building components produced in factories or prefabrication plants with specific sizes, shapes and functions. Prefabricated components are usually processed and manufactured in factories and then installed on site. The use of prefabricated components can improve construction efficiency, quality control and reduce on-site construction time.

[0157] In some embodiments of the present invention, the prefabricated building components include beams, columns, slabs, walls and stairs.

[0158] Next, the technical solution of the present invention will be better understood in combination with embodiments.

[0159] In the embodiment, the dispersant is sodium polyacrylate dispersant. The defoamer is mineral oil defoamer. The bactericide is Kathon. The thickener is polyurethane thickener.

[0160] Embodiment 1

[0161] This embodiment provides a sound insulation coating. It contains:

[0162] 280 g of water,

[0163] 4 g of hydroxyethyl cellulose (viscosity in 2% aqueous solution at 20 °C is 30000 mPa·s),

[0164] 60 g of expanded vermiculite,

[0165] 400 g of styrene-acrylic emulsion (solid content is 50%, ratio of soft and hard monomers is 10:3),

[0166] 200 g of natural rubber powder (80 mesh),

[0167] 60 g of acrylonitrile foamed microspheres (400 mesh),

[0168] 3 g of dispersant,

[0169] 3 g of defoamer,

[0170] 28 g of porous polystyrene microspheres (400 mesh),

[0171] 28 g of wood fiber (1 - 2 mm),

[0172] 2g fungicide.

[0173] The preparation method is:

[0174] S1: adding hydroxyethyl cellulose to the solvent according to the ratio, and stirring at a first stirring rate;

[0175] S2: adding an inorganic filler, a portion of a dispersant and a portion of a defoamer, and stirring at a second stirring rate;

[0176] S3: adding styrene acrylic emulsion and stirring at the third stirring rate;

[0177] S4: adding organic sound insulation filler, remaining dispersant and remaining defoamer, and stirring at a third stirring rate;

[0178] S5: adding a porous drying-promoting filler and stirring at a third stirring rate;

[0179] S6: adding fungicide and stirring at the third stirring rate;

[0180] S7: adding drainage-promoting fiber and stirring at the third stirring rate;

[0181] Among them, the first stirring rate is about 450 rpm, the second stirring rate is about 1350 rpm, and the third stirring rate is about 1000 rpm.

[0182] It should be noted that the dispersant and defoamer are added twice in order to better disperse the components in the coating, while minimizing the formation of bubbles and foam to ensure the quality of the coating.

[0183] Finally, 2 g of thickener was added to adjust the viscosity to the required viscosity for construction, thereby obtaining the sound insulation coating of this embodiment.

[0184] Afterwards, according to Method C of GB / T1728-2020 "Determination of Drying Time of Paint Film and Putty Film", the actual drying time of the paint is 8 hours.

[0185] The test was carried out in accordance with GB / T 19889.6-2005 "Acoustic Sound Insulation Measurement of Buildings and Building Elements Part 6: Laboratory Measurement of Floor Impact Sound Insulation" and the weighted normalized impact sound pressure level of 5mm sound insulation coating was evaluated as 50dB (30dB improvement) in accordance with GB50121-2005 "Building Sound Insulation Evaluation Standard". After laying tiles, the impact sound pressure level was 58dB, which can still meet the sound insulation requirements for green buildings in GB50118-2010 "Civil Building Sound Insulation Design Code".

[0186] Example 2

[0187] Compared with Example 1, in this example, the contents of porous polystyrene microspheres and wood fibers are changed, and thus the solvent content can be reduced to 220 g.

[0188] Specifically, it contains:

[0189] 220 g of water,

[0190] 4 g of hydroxyethyl cellulose (viscosity in 2% aqueous solution at 20 °C is 30000 mPa·s),

[0191] 60 g of expanded vermiculite,

[0192] 400 g of styrene-acrylic emulsion (solid content is 50%, ratio of soft and hard monomers is 10:3),

[0193] 200 g of natural rubber powder (80 mesh),

[0194] 60 g of acrylonitrile foamed microspheres (400 mesh),

[0195] 3 g of dispersant,

[0196] 3 g of defoamer,

[0197] 10 g of porous polystyrene microspheres (400 mesh),

[0198] 10 g of wood fibers (1 - 2 mm in length),

[0199] 2 g of fungicide.

[0200] The specific preparation method is the same as that of Example 1.

[0201] After that, according to the method C in GB / T 1728 - 2020 "Determination of Drying Time of Paint Films and Putty Films", the dry - to - the - touch time of the coating is 14 h.

[0202] Tested according to GB / T 19889.6 - 2005 "Acoustics - Measurement of Sound Insulation in Buildings and Building Elements - Part 6: Laboratory Measurement of Impact Sound Insulation of Floor Coverings", and evaluated according to GB50121 - 2005 "Standard for Evaluation of Building Sound Insulation", the weighted standardized impact sound pressure level of the 5 - mm sound - insulating coating is 48 dB (improvement amount 30 dB), and the impact sound pressure level after laying tiles is 54 dB, which still meets the sound - insulation requirements for green buildings in GB50118 - 2010 "Code for Sound Insulation Design of Civil Buildings".

[0203] Example 3

[0204] Compared with Example 1, Example 3 only changes the type of porous drying - promoting filler. Example 3 contains 28 g of diatomaceous earth (80 mesh).

[0205] Specifically, it contains:

[0206] 28 g of water,

[0207] 4 g of hydroxyethyl cellulose (viscosity in 2% aqueous solution at 20 °C is 30,000 mPa·s),

[0208] 60 g of expanded vermiculite,

[0209] 400 g of styrene-acrylic emulsion (solid content is 50%, ratio of soft and hard monomers is 10:3),

[0210] 200 g of natural rubber powder (80 mesh),

[0211] 60 g of acrylonitrile foamed microspheres (400 mesh),

[0212] 3 g of dispersant,

[0213] 3 g of defoamer,

[0214] 28 g of diatomite (80 mesh),

[0215] 28 g of wood fiber (1 - 2 mm),

[0216] 2 g of fungicide.

[0217] The specific preparation method is the same as that of Example 1.

[0218] After that, according to the test method of Method C in GB / T 1728-2020 "Determination of Drying Time of Paint Films and Putty Films", the dry-to-touch time of the coating is 11 h.

[0219] Compared with diatomite, the elasticity of polystyrene microspheres is better than that of diatomite. This makes the elasticity of the coating in Example 1 better than that in Example 3.

[0220] Tested according to GB / T 19889.6-2005 "Acoustics - Measurement of Sound Insulation in Buildings and Building Elements - Part 6: Laboratory Measurement of Impact Sound Insulation of Floor Coverings", and evaluated according to GB50121-2005 "Standard for Evaluation of Building Sound Insulation", the weighted standardized impact sound pressure level of the 5 mm sound insulation coating is 54 dB (improvement amount 26 dB), and the impact sound pressure level after laying tiles is 63 dB. Compared with Example 1, the impact sound insulation performance of Example 3 decreased by 5 dB, but still meets the sound insulation requirements for green buildings in GB50118-2010 "Code for Sound Insulation Design of Civil Buildings".

[0221] Comparative Example 1

[0222] Compared with Example 1, only the content of porous polystyrene microspheres was changed in Comparative Example 1. Comparative Example 1 contains 4 g of porous polystyrene microspheres.

[0223] After the content of porous polystyrene microspheres is reduced, the microscopic pores on the surface film layer of the coating decrease, and the compactness of the surface film increases.

[0224] Tested according to Method C in GB / T 1728-2020 "Determination of Drying Time of Paint Film and Putty Film", the practical drying time of the coating is 26 h.

[0225] Comparative Example 2

[0226] Compared with Example 1, Comparative Example 2 only changes the content of wood fiber. Comparative Example 2 contains 4 g of wood fiber.

[0227] After the content of wood fiber decreases, the drainage channels of the solvent in the coating from the bottom layer to the surface layer decrease, and the difference in drying time between the bottom layer and the surface layer increases.

[0228] Tested according to Method C in GB / T 1728-2020 "Determination of Drying Time of Paint Film and Putty Film", the practical drying time of the coating is 35 h.

[0229] Comparative Example 3

[0230] Compared with Example 1, Comparative Example 3 changes the type and content of the porous drying accelerator. In Comparative Example 3, it contains 30 g of porous polystyrene microspheres and 20 g of diatomite.

[0231] Furthermore, during the coating preparation process, due to the large volume of the porous drying accelerator, the viscosity of the coating increases and a uniform coating cannot be formed.

[0232] Based on Example 1, after adding 90 g of solvent, a uniform coating can be constructed.

[0233] Tested according to Method C in GB / T 1728-2020 "Determination of Drying Time of Paint Film and Putty Film", the practical drying time of the coating is 10 h.

[0234] Due to the increase in the water content in the coating, the amount of solvent volatilized increases, resulting in an increase in the practical drying time of the coating by 2 h. The increase in the water content in the coating leads to an increase in the volume shrinkage of the coating; in addition, the increase in the content of the porous drying accelerator causes the surface drying speed to be too fast, and the strength of the dry film on the surface of the coating is low when the volume of the bottom layer of the coating shrinks, resulting in a superficial cracking phenomenon.

[0235] Comparative Example 4

[0236] Compared with Example 1, Comparative Example 4 changes the content of wood fiber. In Comparative Example 4, it contains 50 g of wood fiber.

[0237] Furthermore, during the coating preparation process, under the thickening effect of the fiber, the viscosity of the coating increases and a uniform coating cannot be formed. After adding 150 g of solvent, a uniform coating can be constructed. Due to the increase in the water content in the coating, the volume shrinkage of the coating increases, resulting in a cracking phenomenon and an incomplete and uneven film layer is not formed.

[0238] Comparative Example 5

[0239] In Comparative Example 5, compared with Example 1, the contents of the porous polystyrene microspheres and the organic sound insulation filler were changed.

[0240] In Comparative Example 5, no porous polystyrene microspheres were contained, and 220 g of heavy calcium powder (80 mesh) and 100 g of mica powder (120 mesh) were used to replace the acrylonitrile foamed microbeads in Example 1.

[0241] Furthermore, tested according to Method C in GB / T 1728-2020 "Determination of Drying Time of Paint Film and Putty Film", the actual drying time of the coating was 40 h.

[0242] Tested according to GB / T 19889.6-2005 "Acoustics - Measurement of Sound Insulation in Buildings and Building Elements - Part 6: Laboratory Measurement of Impact Sound Insulation of Floorings", and evaluated according to GB50121-2005 "Standard for Evaluation of Building Sound Insulation", the weighted normalized impact sound pressure level of the 5-mm sound insulation coating was 62 dB (improvement amount 18 dB), and the impact sound pressure level after laying tiles was 73 dB, which could not meet the sound insulation requirements for green buildings in GB50118-2010 "Code for Sound Insulation Design of Civil Buildings".

[0243] The porous polystyrene microspheres and acrylonitrile foamed microbeads have high elasticity, and their addition significantly improves the elastic deformation ability of the coating, and thus has a significant impact on the sound insulation performance of the coating.

[0244] The sound insulation coating of the present invention constructs a microscopic porous film layer through the porous drying-promoting functional filler, and combines the adsorption and drainage functions of the drying-promoting drainage fiber to provide channels for the surface and solvent volatilization inside the coating. The drying time of the 3-mm wet film can be shortened to within 16 h, shortening the construction period of the coating by more than 30 h.

[0245] Furthermore, the drainage and drying-promoting filler improves the uniformity of the distribution of the solvent moisture inside the coating and inhibits the too-fast film formation on the surface of the coating. This improves the consistency of the curing degree between the bottom layer and the surface layer of the coating, avoids the cracking of the low-strength surface film under the volume shrinkage stress generated during the subsequent drying of the bottom layer, and improves the crack resistance of the coating.

[0246] The sound insulation coating of the present invention is a quick-drying thick-film sound insulation coating, and the thickness of a single construction can reach 6 mm to 7 mm, and it can be completed in one construction, reducing the construction frequency.

[0247] Through the damping effect of the polymer sound insulation functional filler of the organic sound insulation filler, combined with the high elasticity of the porous drying-promoting filler such as porous polystyrene microspheres, the elasticity of the coating after film formation is improved, and thus good sound insulation performance is obtained. The impact sound pressure level is reduced to 50 dB to 60 dB, and thus more sound insulation performance margin is left for the construction decorative surface layer, improving the sound insulation experience after completion.

[0248] The present invention has been described in detail above in conjunction with the embodiments. However, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the scope of knowledge possessed by those of ordinary skill in the relevant art.

Claims

1. A sound insulation coating, characterized in that, In parts by weight, the components include: Styrene-acrylic emulsion: 100 parts, Inorganic filler: 10 parts to 25 parts, Organic sound insulation filler: 30 parts to 100 parts, Porous drying accelerator filler: 2.5 parts to 10 parts, Drainage drying accelerator fiber: 2.5 parts to 10 parts, Hydroxyethyl cellulose: 0.4 parts to 1 part, Dispersant: 0.5 parts to 2 parts, Defoamer: 0.5 parts to 2 parts, Thickener: 0.25 parts to 1 part, Bactericide: 0.25 parts to 1 part, Solvent: 50 parts to 75 parts, In the styrene-acrylic emulsion, the mass ratio of the soft monomer to the styrene group of the hard monomer is 20:4 to 7; The organic sound insulation filler includes solid damping filler and hollow high-elastic filler. The solid damping filler includes at least one of nitrile rubber powder, ethylene-propylene rubber powder, and polyurethane powder. The hollow high-elastic filler includes at least one of acrylonitrile foamed microbeads, polyvinylidene chloride foamed microbeads, and acrylate foamed microbeads. The weight ratio of the hollow high-elastic filler to the solid damping filler is 0.2 - 0.8:1; The porous drying accelerator filler is porous polystyrene microspheres; The drainage drying accelerator fiber is wood fiber. The length of the drainage drying accelerator fiber is 1 to 2 mm. Through the adsorption of the drainage drying accelerator fiber and using the one-dimensional long-range structure of the fiber, a static drainage channel from the bottom layer to the surface layer is constructed to increase the solvent evaporation rate of the bottom layer of the coating and promote the film formation of the coating. The mass ratio of the drainage drying accelerator fiber to the porous drying accelerator filler is 0.9 to 1.1:1; The solid content of the styrene-acrylic emulsion is 45% - 55%.

2. The sound insulation coating according to claim 1, wherein, The inorganic filler includes at least one of expanded vermiculite, perlite, and cenospheres.

3. A method for preparing the sound insulation coating according to any one of claims 1 to 2, characterized in that, It includes the following steps: adding the hydroxyethyl cellulose, inorganic filler, styrene-acrylic emulsion, organic sound insulation filler, dispersant, defoamer, porous drying accelerator filler, drainage drying accelerator fiber, bactericide, and thickener into the solvent and mixing them evenly to obtain the sound insulation coating.

4. A sound insulation coating, characterized in that, Prepared from the sound insulation coating according to any one of claims 1 to 2 or the method according to claim 3.

5. The sound insulation coating according to claim 4, wherein The thickness of the sound insulation coating is 3 mm to 8 mm.

6. A building prefabricated component, characterized in that, Includes the sound insulation coating according to any one of claims 1 to 2 or the sound insulation coating according to any one of claims 4 to 5.