Soundproofing coating

Abstract

This invention discloses a sound-insulating coating, belonging to the field of coating technology. It consists of two parts: component A (powder) and component B (slurry), with a mass ratio of 3:2. Component A includes the following raw materials: construction waste, binder, perlite, crack-resistant fiber, composite waterproofing agent, and modified silica. Component B includes: silica sol, acrylic emulsion, waterborne polyurethane, defoamer, and water. This invention uses construction waste as the main filler in the coating, offering the environmental advantage of turning waste into treasure. Furthermore, the interface between the construction waste, the film-forming matrix, and the air causes scattering and refraction of sound waves, enhancing the sound insulation performance of the coating. The addition of modified silica promotes the uniform distribution of hollow silica particles in the coating, making it easier to effectively block sound wave transmission. It also imparts certain flame-retardant properties to the coating, ultimately resulting in a sound-insulating coating with flame-retardant function.

Description

Technical Field

[0001] This invention belongs to the field of coating technology, specifically, it relates to a sound insulation coating. Background Technology

[0002] Noise is ubiquitous in daily life, transportation, and industry, and it significantly reduces people's quality of life. Therefore, the demand for sound insulation is widespread and important. However, currently used sound insulation materials often require a considerable thickness to achieve effective sound insulation, which leads to inconvenience in use and construction. Furthermore, retrofitting existing buildings for sound insulation incurs higher costs. Applying a layer of sound-insulating coating to the surface of building walls can effectively improve these problems.

[0003] For safety reasons, building materials are required to have flame-retardant and fire-resistant properties. Therefore, it is of great significance to make sound insulation coatings have flame-retardant properties.

[0004] Furthermore, with urban development and renovation, construction waste is increasing daily. Construction waste comprises solid waste generated during urban construction, including discarded concrete, waste glass, ceramic shards, marble and granite fragments from decoration and renovation, and a mixture of waste bricks, tiles, and old wall debris from urban redevelopment and demolition. The primary method for treating construction solid waste is simple landfilling. However, this method accumulates over time, occupying mountainous areas and arable land. Long-term landfilling not only consumes vast amounts of land resources but also deteriorates the natural environment. Therefore, how to recycle and utilize construction solid waste is a direction we need to strive towards. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a sound insulation coating.

[0006] This invention uses construction waste as the main filler in the coating, offering the environmental advantage of turning waste into treasure. Furthermore, the interface between the construction waste, the film-forming matrix (acrylic acid, polyurethane), and the air causes scattering and refraction of sound waves, increasing the propagation path of sound waves within the coating and thus increasing the loss of sound energy through the coating, thereby enhancing the coating's sound insulation performance. The addition of perlite, a porous and expandable structure, hinders sound wave transmission, further improving the coating's sound insulation performance. The addition of modified silica promotes the uniform distribution of hollow silica particles in the coating, making it easier for them to effectively block sound wave transmission, further enhancing the coating's sound insulation performance. It also imparts certain flame-retardant properties to the coating, ultimately resulting in a flame-retardant sound-insulating coating with a wide range of applications.

[0007] The objective of this invention can be achieved through the following technical solutions:

[0008] A sound insulation coating consists of two parts, component A and component B. Component A is a powder and component B is a slurry, and the mass ratio of component A to component B is 3:2.

[0009] Component A comprises the following raw materials in parts by weight: 70-80 parts construction waste, 0.9-1.1 parts binder, 3-5 parts perlite (70-90 mesh), 0.4-0.5 parts crack-resistant fiber, 0.5-0.7 parts composite waterproofing agent, and 8-10 parts modified silica.

[0010] Component B comprises the following raw materials in parts by weight: 15-18 parts silica sol, 4-6 parts acrylic emulsion, 10-14 parts waterborne polyurethane, 0.2-0.3 parts defoamer, and 3-5 parts water;

[0011] Furthermore, construction waste includes broken bricks, broken concrete, bamboo and wood, and crushed stone. After crushing, sorting, and magnetic separation to remove waste metal, the broken bricks, broken concrete, bamboo and wood, and crushed stone are dried and ground into powder with a fineness of less than 200 mesh.

[0012] Preferably, the mass ratio of crushed bricks, crushed concrete, bamboo and wood and crushed stone is 28:13:17:16.

[0013] Furthermore, the binder is water glass or dextrin.

[0014] Furthermore, the composite waterproofing agent is JS-WG high-efficiency composite waterproofing agent.

[0015] The interface between construction waste, the film-forming matrix (acrylic acid, polyurethane), and air causes scattering and refraction of sound waves, increasing the propagation path of sound waves in the coating and increasing the loss of sound energy through the coating, thereby enhancing the sound insulation performance of the coating. The added perlite is a porous and expandable structure that hinders the transmission of sound waves, thus improving the sound insulation performance of the coating. Polyurethane is used as one of the raw materials (one of the film-forming matrices). Due to its strong hydrogen bonding, the system has microscopic self-phase separation and generates large internal heat dissipation under vibration, making it a good vibration damping material, thereby further improving the sound insulation performance of the coating.

[0016] Furthermore, the modified silica is prepared through the following steps:

[0017] S1. Add 3-aminopropyltrimethoxysilane and an aqueous ethanol solution (50% by volume) to a round-bottom flask, mix and dissolve thoroughly, then add hollow silica particles, sonicate for 10 min, and reflux and stir at 82℃ for 2 h. Filter, wash the product three times each with ethanol and deionized water, and finally dry under vacuum at 60℃ for 10 h to obtain intermediate product 1. The ratio of hollow silica particles, 3-aminopropyltrimethoxysilane, and aqueous ethanol solution is 10 g: 60 mL: 150 mL.

[0018] Amino molecular chains are grafted onto the surface of hollow silica particles via the hydrolysis of 3-aminopropyltrimethoxysilane and the reaction with the -OH groups on the particle surface. The process is shown below:

[0019]

[0020] S2. After mixing intermediate product 1 with DMF (N,N-dimethylformamide) and sonicating for 10 min, the dispersion was transferred to a three-necked flask equipped with a reflux condenser and a stirrer. The flask was placed in a constant temperature water bath. When the temperature of the dispersion reached 30℃, a DMF solution of 4-hydroxyphenylacetaldehyde was slowly added dropwise. After the addition was complete, the mixture was kept at 30℃ and stirred for 5 h. The product was separated by centrifugation and washed three times with ethanol and deionized water, respectively. Finally, it was vacuum dried at 60℃ for 10 h to obtain intermediate product 2. The ratio of intermediate product 1, ethanol, and DMF solution of 4-hydroxyphenylacetaldehyde was 10 g: 150 mL: 55-65 mL. The concentration of the DMF solution of 4-hydroxyphenylacetaldehyde was 27.2 g / 100 mL.

[0021] The -NH2 grafted onto intermediate 1 undergoes an aldehyde-amine condensation reaction with the -CHO on the 4-hydroxyphenylacetaldehyde molecule under heating conditions to obtain intermediate 2. The reaction process is shown below:

[0022]

[0023] S3. After mixing intermediate product 2 with 1,4-dioxane, sonicate for 10 min, transfer the dispersion to a three-necked flask equipped with a reflux condenser and a stirrer, add DOPO (9,10-2H-9-oxa-10-phosphaphenanthrene-10-oxide), and stir the mixture at 90℃ for 6 h. After the reaction is complete, allow the system to cool to room temperature, centrifuge, and wash three times with ethanol and deionized water, respectively. Finally, vacuum dry at 60℃ for 10 h to obtain modified silica. The ratio of intermediate product 2, 1,4-dioxane, and DOPO is 10 g: 180 mL: 20-25 g.

[0024] The -N=C- group on intermediate product 2 undergoes an addition reaction with the pH group on the DOPO molecule to obtain modified silica. The specific reaction process is shown below:

[0025]

[0026] Through a series of chemical reactions, organic molecular chains are grafted onto the surface of silica, thereby improving various properties. Specifically: First, silica itself is an inorganic particle that is prone to agglomeration. By grafting organic molecular chains onto its surface, its agglomeration phenomenon can be improved, as well as its interfacial compatibility with the coating film-forming matrix, promoting its uniform dispersion in the coating and thus better exerting its various properties. Second, the ends of the molecular chains grafted onto its surface are phenolic hydroxyl groups, which can chemically react with one of the film-forming matrices (polyurethane matrix), promoting the formation of a cross-linked network structure while improving the bonding ability between silica and the coating. Third, its surface is grafted with nitrogen-containing groups, phosphate ester groups, and benzene rings. Nitrogen and phosphorus synergistically retard flame, and benzene rings are easy to char. Therefore, its surface is grafted with highly efficient flame-retardant components. These flame-retardant components are evenly distributed in the coating along with the silica, giving the coating certain flame-retardant properties. Compared with ordinary organic flame retardants, it can overcome the characteristics of easy exudation and migration, and continuously and stably exert its flame-retardant effect.

[0027] Modified silica is based on the modification of hollow silica particles. When it is evenly distributed in the coating, the air inside the hollow silica is in a narrow space, which makes it difficult to diffuse, thus hindering the transmission of sound waves and increasing the sound insulation performance of the coating.

[0028] The beneficial effects of this invention are:

[0029] This invention uses construction waste as the main filler in the coating, which has the environmental advantage of turning waste into treasure. Furthermore, perlite is added to the coating. There is an interface between the construction waste, the film-forming matrix (acrylic acid, polyurethane), and the air, which will scatter and refract sound waves, increase the propagation path of sound waves in the coating, and increase the loss of sound energy through the coating, thereby enhancing the sound insulation performance of the coating. The added perlite is a porous and expandable structure that hinders the transmission of sound waves, thereby improving the sound insulation performance of the coating.

[0030] To further improve the sound insulation and flame retardant properties of coatings, this invention uses modified silica as a raw material. Through a series of chemical reactions, organic molecular chains are grafted onto the surface of the silica, thereby improving various properties. Specifically: First, silica itself is an inorganic particle that is prone to aggregation. By grafting organic molecular chains onto its surface, its aggregation phenomenon can be improved, as well as its interfacial compatibility with the coating film-forming matrix, promoting its uniform dispersion in the coating and thus better exerting its various properties. Second, the ends of the grafted molecular chains are phenolic hydroxyl groups, which can chemically react with one of the film-forming matrices (polyurethane matrix), promoting cross-linking. The formation of the network structure enhances the bonding ability between silica and coatings; thirdly, its surface is grafted with nitrogen-containing groups, phosphate groups, and benzene rings. Nitrogen and phosphorus synergistically retard flame, and benzene rings are easy to char. Therefore, its surface is grafted with highly efficient flame-retardant components. These flame-retardant components are evenly distributed in the coating along with the silica, giving the coating certain flame-retardant properties. Compared with ordinary organic flame retardants, it can overcome the characteristics of easy seepage and easy migration, and continuously and stably exert the flame-retardant effect; modified silica is based on the modification of hollow silica particles. When evenly distributed in the coating, the air inside the hollow silica is in a narrow space, which is difficult to diffuse, hindering the transmission of sound waves and increasing the sound insulation performance of the coating. Detailed Implementation

[0031] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0032] Example 1

[0033] Modified silica is prepared through the following steps:

[0034] S1. Add 60 mL of 3-aminopropyltrimethoxysilane and 150 mL of ethanol aqueous solution (ethanol aqueous solution volume fraction is 50%) to a round bottom flask, mix and dissolve evenly, then add 10 g of hollow silica particles, sonicate for 10 min, and then reflux and stir at 82 °C for 2 h. Filter, wash the product with ethanol and deionized water three times each, and finally dry it under vacuum at 60 °C for 10 h to obtain intermediate product 1.

[0035] S2. Mix 10g of intermediate product 1 with 150mL of DMF (N,N-dimethylformamide), sonicate for 10min, and then transfer the dispersion to a three-necked flask equipped with a reflux condenser and a stirrer. Place the flask in a constant temperature water bath. When the temperature of the dispersion reaches 30℃, slowly add 55mL of 4-hydroxyphenylacetaldehyde DMF solution. After the addition is complete, keep the mixture at 30℃ and stir for 5h. The product is then separated by centrifugation and washed three times with ethanol and deionized water, and finally vacuum dried at 60℃ for 10h to obtain intermediate product 2. The concentration of the 4-hydroxyphenylacetaldehyde DMF solution is 27.2g / 100mL.

[0036] S3. Mix 10g of intermediate product 2 with 180mL of 1,4-dioxane and sonicate for 10min. Transfer the dispersion to a three-necked flask equipped with a reflux condenser and a stirrer. Add 20g of DOPO (9,10-2H-9-oxa-10-phosphaphenanthrene-10-oxide) and stir at 90℃ for 6h. After the reaction is complete, allow the system to cool to room temperature, centrifuge, and wash three times with ethanol and deionized water. Finally, vacuum dry at 60℃ for 10h to obtain modified silica.

[0037] Example 2

[0038] Modified silica is prepared through the following steps:

[0039] S1. Add 60 mL of 3-aminopropyltrimethoxysilane and 150 mL of ethanol aqueous solution (ethanol aqueous solution volume fraction is 50%) to a round bottom flask, mix and dissolve evenly, then add 10 g of hollow silica particles, sonicate for 10 min, and then reflux and stir at 82 °C for 2 h. Filter, wash the product with ethanol and deionized water three times each, and finally dry it under vacuum at 60 °C for 10 h to obtain intermediate product 1.

[0040] S2. Mix 10g of intermediate product 1 with 150mL of DMF (N,N-dimethylformamide), sonicate for 10min, and then transfer the dispersion to a three-necked flask equipped with a reflux condenser and a stirrer. Place the flask in a constant temperature water bath. When the temperature of the dispersion reaches 30℃, slowly add 65mL of 4-hydroxyphenylacetaldehyde DMF solution. After the addition is complete, keep the mixture at 30℃ and stir for 5h. The product is then separated by centrifugation and washed three times with ethanol and deionized water, and finally vacuum dried at 60℃ for 10h to obtain intermediate product 2. The concentration of the 4-hydroxyphenylacetaldehyde DMF solution is 27.2g / 100mL.

[0041] S3. Mix 10g of intermediate product 2 with 180mL of 1,4-dioxane and sonicate for 10min. Transfer the dispersion to a three-necked flask equipped with a reflux condenser and a stirrer. Add 25g of DOPO (9,10-2H-9-oxa-10-phosphaphenanthrene-10-oxide) and stir at 90℃ for 6h. After the reaction is complete, allow the system to cool to room temperature, centrifuge, and wash three times with ethanol and deionized water. Finally, vacuum dry at 60℃ for 10h to obtain modified silica.

[0042] Example 3

[0043] A sound insulation coating consists of two parts, component A and component B. Component A is a powder and component B is a slurry, and the mass ratio of component A to component B is 3:2.

[0044] Component A comprises the following raw materials by weight: 70 kg of construction waste, 0.9 kg of water glass, 3-5 kg ​​of perlite (70-90 mesh), 0.4 kg of crack-resistant fiber, 0.5 kg of JS-WG high-efficiency composite waterproofing agent, and 8 kg of modified silica prepared in Example 1.

[0045] Component B comprises the following raw materials by weight: 15 kg silica sol, 4 kg acrylic emulsion, 10 kg waterborne polyurethane, 0.2 kg defoamer, and 3 kg water;

[0046] Construction waste includes broken bricks, broken concrete, bamboo and wood, and crushed stone. The broken bricks, broken concrete, bamboo and wood, and crushed stone are mixed in a mass ratio of 1:1:1:1. After crushing, sorting, and magnetic separation to remove waste metal, the mixture is dried and sand-milled to produce powder with a fineness of less than 200 mesh.

[0047] Mix each raw material in component A and component B evenly, then mix components A and B evenly in a mass ratio of 3:2 to obtain the coating.

[0048] Example 4

[0049] A sound insulation coating consists of two parts, component A and component B. Component A is a powder and component B is a slurry, and the mass ratio of component A to component B is 3:2.

[0050] Component A comprises the following raw materials by weight: 75 kg of construction waste, 1.0 kg of dextrin, 4 kg of perlite (70-90 mesh), 0.45 kg of crack-resistant fiber, 0.6 kg of JS-WG high-efficiency composite waterproofing agent, and 9 kg of modified silica prepared in Example 2.

[0051] Component B comprises the following raw materials by weight: 16.5 kg silica sol, 5 kg acrylic emulsion, 12 kg waterborne polyurethane, 0.25 kg defoamer, and 4 kg water;

[0052] Construction waste includes broken bricks, broken concrete, bamboo and wood, and crushed stone. The broken bricks, broken concrete, bamboo and wood, and crushed stone are mixed in a mass ratio of 28:13:17:16. After crushing, sorting, and magnetic separation to remove waste metal, the mixture is dried and sand-milled to produce powder with a fineness of less than 200 mesh.

[0053] Mix each raw material in component A and component B evenly, then mix components A and B evenly in a mass ratio of 3:2 to obtain the coating.

[0054] Example 5

[0055] A sound insulation coating consists of two parts, component A and component B. Component A is a powder and component B is a slurry, and the mass ratio of component A to component B is 3:2.

[0056] Component A comprises the following raw materials by weight: 80 kg of construction waste, 1.1 kg of water glass, 5 kg of perlite (70-90 mesh), 0.5 kg of crack-resistant fiber, 0.7 kg of JS-WG high-efficiency composite waterproofing agent, and 10 kg of modified silica prepared in Example 1.

[0057] Component B comprises the following raw materials by weight: 18 kg silica sol, 6 kg acrylic emulsion, 14 kg waterborne polyurethane, 0.3 kg defoamer, and 5 kg water;

[0058] Construction waste includes broken bricks, broken concrete, bamboo and wood, and crushed stone. The broken bricks, broken concrete, bamboo and wood, and crushed stone are mixed in a mass ratio of 2:1:1:1. After crushing, sorting, and magnetic separation to remove waste metal, the mixture is dried and sand-milled to produce powder with a fineness of less than 200 mesh.

[0059] Mix each raw material in component A and component B evenly, then mix components A and B evenly in a mass ratio of 3:2 to obtain the coating.

[0060] Comparative Example 1

[0061] The modified silica in Example 3 was replaced with ordinary silica, while the other raw materials and preparation process remained unchanged.

[0062] Sound insulation performance testing: Measurements were conducted according to GB / T 19889.6-2005 "Acoustic Measurement of Sound Insulation of Buildings and Building Components - Part 6: Laboratory Measurement of Impact Sound Insulation of Floor Slabs". The results can be used to compare the impact sound insulation characteristics of floor slabs. In the laboratory test, a fixed 100mm precast floor slab was used as the reference floor slab (Comparative Example 2), and 100mm precast floor slabs coated with the coatings prepared in Examples 3-5 and Comparative Example 1 were tested.

[0063] Flame retardant performance test: The fire resistance rating of the coating is tested according to ASTM E84;

[0064] The measured results are shown in the table below:

[0065]

[0066] As can be seen from the data in the table above, the sound insulation coating obtained by the present invention has good sound insulation performance and flame retardant and fireproof performance; as can be seen from the data of Comparative Example 1, after modification, silica can not only further improve the sound insulation performance of the coating, but also endow the coating with good flame retardant properties.

[0067] In the description of this specification, the references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0068] The above description is merely an example and illustration of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the invention or exceed the scope defined in the claims, all of which should fall within the protection scope of the present invention.

Claims

1. A sound-insulating coating, characterized in that, It consists of two parts, A and B. Component A is powder and component B is slurry, and the mass ratio of component A to component B is 3:

2. Component A comprises the following raw materials in parts by weight: 70-80 parts construction waste, 0.9-1.1 parts binder, 3-5 parts perlite, 0.4-0.5 parts crack-resistant fiber, 0.5-0.7 parts composite waterproofing agent, and 8-10 parts modified silica. Component B comprises the following raw materials in parts by weight: 15-18 parts silica sol, 4-6 parts acrylic emulsion, 10-14 parts waterborne polyurethane, 0.2-0.3 parts defoamer, and 3-5 parts water; The modified silica is prepared through the following steps: S1. 3-Aminopropyltrimethoxysilane and an aqueous ethanol solution were added to a round-bottom flask and mixed thoroughly. Hollow silica particles were then added, and the mixture was sonicated for 10 minutes. The mixture was then refluxed and stirred at 82°C for 2 hours. The mixture was filtered, and the product was washed three times each with ethanol and deionized water. Finally, it was vacuum dried at 60°C for 10 hours to obtain intermediate product 1. The ratio of hollow silica particles, 3-aminopropyltrimethoxysilane, and aqueous ethanol solution was 10 g: 60 mL: 150 mL; the volume fraction of the aqueous ethanol solution was 50%. S2. After mixing intermediate product 1 with DMF, sonicate for 10 min, then transfer the dispersion to a three-necked flask equipped with a reflux condenser and a stirrer. Place the flask in a constant temperature water bath. When the temperature of the dispersion reaches 30℃, slowly add a DMF solution of 4-hydroxyphenylacetaldehyde. After the addition is complete, keep the mixture at 30℃ and stir for 5 h. The product is separated by centrifugation and washed three times with ethanol and deionized water, and finally vacuum dried at 60℃ for 10 h to obtain intermediate product 2. The ratio of intermediate product 1, DMF, and DMF solution of 4-hydroxyphenylacetaldehyde is 10 g: 150 mL: 55-65 mL; the concentration of the DMF solution of 4-hydroxyphenylacetaldehyde is 27.2 g / 100 mL. S3. After mixing intermediate product 2 with 1,4-dioxane, sonicate for 10 min. Transfer the dispersion to a three-necked flask equipped with a reflux condenser and a stirrer. Add DOPO and stir the mixture at 90℃ for 6 h. After the reaction is complete, allow the system to cool to room temperature, centrifuge, and wash three times with ethanol and deionized water, respectively. Finally, vacuum dry at 60℃ for 10 h to obtain modified silica. The ratio of intermediate product 2, 1,4-dioxane, and DOPO is 10 g: 180 mL: 20-25 g. The structural formula of the modified silica is shown below: ; Through modification, organic molecular chains are grafted onto silica. The ends of these organic molecular chains are phenolic hydroxyl groups, and the chains contain -NH-, phosphate ester groups, and benzene rings.

2. The sound-insulating coating according to claim 1, characterized in that, The construction waste includes broken bricks, broken concrete, bamboo and wood, and crushed stones. After crushing, sorting, and magnetic separation to remove waste metal, the broken bricks, broken concrete, bamboo and wood, and crushed stones are dried and ground to produce powder with a fineness of less than 200 mesh.

3. The sound-insulating coating according to claim 2, characterized in that, The mass ratio of broken bricks, broken concrete, bamboo and wood, and broken stones is 28:13:17:

16.

4. The sound-insulating coating according to claim 1, characterized in that, The binder is water glass or dextrin.

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