Environmentally friendly sound insulation coating and preparation method thereof

Abstract

The invention discloses an environmentally friendly sound-insulating coating and a preparation method thereof, and belongs to the technical field of coatings. The environmentally friendly sound-insulating coating is composed of the following raw materials: acrylic elastic emulsion, water-based polyurethane resin, rubber powder, hydroxypropyl methylcellulose, polyamide, preservative, sodium stearate, defoaming agent, sound-insulating material, and water, and the sound-insulating material is prepared from porous copolymer and modified hollow glass. The environmentally friendly sound-insulating coating prepared by the invention has good sound-insulating effect, is simple to prepare, has feasible process, has low production cost, and is environmentally friendly and economical.

Description

Technical Field

[0001] The invention relates to the technical field of coatings, and in particular to an environmentally friendly sound-insulating coating and a preparation method thereof. Background Art

[0002] Maglev trains and EMUs are advanced forms of high-speed rail transportation. They face a series of noise and vibration problems during operation, which may have a negative impact on the performance of the train, the comfort of passengers and the surrounding environment. In order to reduce the noise and vibration level, improve the comfort of passengers and meet the environmental noise standards, some core large components of maglev trains and EMUs are usually coated with sound insulation coatings.

[0003] Volatile organic compounds are a class of chemicals that are widely present in coatings. They can evaporate into the air and have a negative impact on indoor air quality. These substances not only pose potential hazards to the human respiratory and immune systems, but their volatilization in the atmosphere can lead to air pollution and have long-term adverse effects on the environment. Therefore, researchers began to look for alternatives, including the development of environmentally friendly sound-proof coatings to reduce the adverse effects of coatings on the environment and human health. The use of sound-proof coatings can help optimize the noise control effect of maglev trains and EMUs, improve the overall performance of the trains and the comfort of passengers, while meeting environmental protection requirements. These coatings are usually applied to vehicle surfaces, interiors of carriages, and mechanical parts to minimize the transmission of noise and vibration.

[0004] Chinese invention patent CN113717593B discloses a water-based sound insulation coating, comprising: the following raw materials in parts by weight: 5-15 parts of acrylic elastic emulsion, 5-15 parts of silicone styrene acrylic emulsion, 5-10 parts of redispersible rubber powder, 20-40 parts of hollow glass microspheres, 10-30 parts of mineral fiber, 5-10 parts of cellulose, 5-10 parts of preservatives, and 30-50 parts of water. The sound insulation coating prepared by the invention has good sound insulation performance, but the hollow glass microspheres in the invention have poor dispersion performance in the coating, resulting in uneven distribution in the coating, affecting the overall performance of the coating. Therefore, the present invention further optimizes the technical solution on this basis to improve the sound insulation effect and environmental protection performance. Summary of the invention

[0005] In view of the above-mentioned deficiencies in the prior art, the present invention provides an environmentally friendly sound-insulating coating and a preparation method thereof.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] The environmentally friendly sound-proof coating is composed of the following raw materials in parts by weight: 30-60 parts by weight of acrylic elastic emulsion, 20-40 parts by weight of water-based polyurethane resin, 3-8 parts by weight of rubber powder, 5-12 parts by weight of hydroxypropyl methylcellulose, 1-3 parts by weight of polyamide, 1-3 parts by weight of preservative, 2-5 parts by weight of sodium stearate, 0.3-1 parts by weight of defoaming agent, 3-8 parts by weight of sound-proof material, and 20-50 parts by weight of water.

[0008] The present invention mainly uses acrylic elastic emulsion and waterborne polyurethane resin as main raw materials, both of which have excellent elasticity and flexibility, which enables the coating to form a soft and elastic coating after construction, which helps to absorb and weaken the incoming sound waves, thereby improving the sound insulation effect. Since both have good adhesion, they can be firmly attached to the surface of various substrates to ensure the stability and durability of the coating. Hydroxypropyl methylcellulose has excellent dispersibility and forms a three-dimensional network structure after mixing, which enhances the support and durability of the system, can improve the stability, strength, density and uniformity of the system, and plays the role of heat preservation, crack resistance, sound insulation and shock absorption in the coating. Using polyamide not only accelerates the drying speed of the coating, but also enhances the bonding ability of the coating with the interface. Sodium stearate has good dispersibility and can effectively disperse the raw materials in the system to improve the uniformity of the system; the defoamer can improve the flatness of the coating and reduce the foaming in the coating; the added sound insulation material is the main sound insulation material and can effectively improve the sound insulation effect of the coating.

[0009] The preservative is at least one of 2-methyl-4-isothiazoline-3-one and 1,2-benzisothiazolin-3-one.

[0010] The defoaming agent is at least one of tributyl phosphate, trimesic acid ester, dimethyl silicone oil, polyoxypropylene glycerol ether, and ether defoaming agents.

[0011] The sound insulation material is hollow glass microspheres, modified hollow glass microspheres or porous copolymer modified hollow glass microspheres.

[0012] The interior of hollow glass microspheres is a rarefied gas, so they have the characteristics of sound insulation and heat insulation, and are excellent fillers for various heat insulation and sound insulation products. The sound insulation effect of hollow glass microspheres in coatings is mainly based on their lightweight and porous characteristics and the reflection, absorption and scattering phenomena that occur when sound waves propagate in different media. The specific effects are as follows: (1) Because of its hollow structure and relatively light weight, lightweight coatings are more likely to vibrate, so they can absorb and scatter sound waves more effectively; (2) The porous structure can not only absorb part of the sound wave energy and reduce the propagation ability of sound waves; the porous structure allows them to form a porous acoustic isolation layer in the coating. When sound waves propagate in porous materials, multiple reflections and refractions will occur, thereby weakening the propagation of sound waves; (3) By adjusting the density and distribution of microspheres, the reflectivity of the coating surface can be increased, thereby reducing the penetration of sound waves. In short, by introducing hollow glass microspheres into coatings, the acoustic properties of the coating can be improved, noise propagation can be reduced, and the comfort of the environment can be improved, thereby achieving a sound insulation effect.

[0013] The preparation method of the modified hollow glass microspheres comprises the following steps: placing 8-12 parts by weight of hollow glass microspheres in 60-100 parts by weight of 0.5-1 mol / L hydrochloric acid, stirring at 80-100° C. and 400-600 rpm for 40-60 min, adjusting the pH value to 6.5-7.5, centrifuging, and drying to obtain pretreated hollow glass microspheres; then adding 80-140 parts by weight of 20-40wt% ethanol aqueous solution and 0.5-2 parts by weight of coupling agent, stirring at 80-90° C. and 400-600 rpm for 1-3 h, washing, and drying to obtain the modified hollow glass microspheres.

[0014] Hollow glass microspheres are usually powdered. In order to ensure that they are evenly dispersed in the paint and prevent agglomeration and sedimentation, their surface needs to be modified. The modification can make the surface of the microspheres hydrophilic or lipophilic, so that they can be better dispersed in the paint matrix and improve their dispersion, compatibility, stability and adhesion properties in the paint.

[0015] Porous copolymer materials have many advantages such as low density, good sound insulation performance, and high specific strength. Applying them in coatings can effectively soundproof, and its main mechanism involves the absorption, scattering and isolation of sound waves. Sound wave absorption: The pore structure of porous copolymer materials can effectively absorb the incident sound wave energy. When the sound wave enters the porous copolymer coating, it will propagate in the pores through the air, and friction and vibration will occur on the surface of the pore wall, thereby converting the sound wave energy into heat energy and weakening the propagation of the sound wave; Sound wave scattering: The surface structure of porous copolymer materials can cause the scattering of sound waves, reflecting the sound waves from the original direction to different directions, and the energy of the sound waves can be more evenly distributed on the coating surface, thereby reducing the propagation efficiency of the sound waves; Using porous copolymers in coatings can increase the density and damping effect of the coating, which can effectively prevent the propagation of sound waves and improve the sound insulation effect. In general, porous copolymer materials effectively improve the sound insulation performance of coatings by absorbing, scattering and isolating sound waves in sound insulation coatings, providing strong support for creating a more comfortable environment.

[0016] The preparation method of the porous copolymer modified hollow glass microspheres comprises the following steps: S1, soaking the hollow glass microspheres in hydrochloric acid, centrifuging, and drying to obtain pretreated hollow glass microspheres; then adding ethanol aqueous solution and a coupling agent, heating and stirring, washing, and drying to obtain modified hollow glass microspheres;

[0017] S2: mixing water and disodium lauryl sulfosuccinate, adding N-hydroxymethyl (meth) acrylamide, acrylic acid, maleic acid, methyl methacrylate, diethylene glycol monoacrylate and dodecyl mercaptan, and stirring to obtain a mixed solution A;

[0018] S3, under a nitrogen atmosphere, mixing water, disodium lauryl sulfosuccinate and potassium carbonate, adding the mixed solution A and an ethanol solution of azoisobutylcyanamide, heating and stirring, cooling, filtering, washing and drying to obtain a porous copolymer;

[0019] S4: Under nitrogen protection, the modified hollow glass microspheres, the porous copolymer, ethylenediamine and ethanol are stirred, heated and stirred, and the solvent is distilled off under reduced pressure to obtain porous copolymer modified hollow glass microspheres.

[0020] The specific reaction mechanism is as follows: S1 uses a silane coupling agent to modify the hollow glass microspheres so that the surface of the hollow glass microspheres has amino or hydroxyl groups, while improving the dispersion and the same performance of the hollow glass microspheres in the system; S2-S3 uses N-hydroxymethyl (methyl) acrylamide, acrylic acid, maleic acid, methyl methacrylate, and diethylene glycol monoacrylate as raw materials for porous copolymer materials, uses dodecyl mercaptan as a chain transfer agent, and uses azoisobutylcyanamide as an initiator to undergo polymerization reaction to obtain a porous copolymer; S4 uses the modified hollow glass microspheres obtained in S1 and the porous copolymer obtained in S3 as reaction raw materials, reacts them under heating for condensation reaction, and finally obtains the porous copolymer-modified hollow glass microspheres by reduced pressure distillation.

[0021] The present invention effectively combines hollow glass microspheres modified by silane coupling agents with porous copolymer materials, giving full play to their respective advantages, utilizing the good sound insulation properties of porous copolymers, whose pore structure can absorb and scatter sound waves, and the sound insulation and good dispersion properties of modified hollow glass microspheres. The two synergistically enhance the sound insulation effect of the coating and improve the environmental performance of the coating. Specifically, after the surface treatment of the silane-modified hollow glass microspheres, their surfaces will have affinity, which helps to improve the adhesion between the microspheres and the porous copolymer, which helps to ensure that the two can be evenly dispersed in the coating to form a stable composite system. When combined with porous copolymers, the modified microspheres are more easily evenly dispersed in the pore structure of the copolymer, improving the dispersibility of the hollow glass microspheres, reducing the agglomeration of the microspheres, and increasing the surface area of ​​the coating, and a more complex acoustic structure can be formed, thereby improving the overall sound insulation performance. Through the synergistic effect of the silane-modified hollow glass microspheres and porous copolymers, the coating can fully utilize the lightweight properties of the microspheres, the surface properties of the silane modification and the acoustic properties of the porous copolymers, thereby achieving a more efficient sound insulation effect. Due to the porous structure of the porous copolymer-modified hollow glass microspheres, harmful gases and free formaldehyde in the coating can be effectively absorbed, which can improve the environmental protection effect of the coating.

[0022] Preferably, the method for preparing the porous copolymer modified hollow glass microspheres comprises the following steps:

[0023] S1: placing 8-12 parts by weight of hollow glass microspheres in 60-100 parts by weight of 0.5-1 mol / L hydrochloric acid, stirring at 80-100° C. and 400-600 rpm for 40-60 min, adjusting the pH value to 6.5-7.5, centrifuging, and drying to obtain pretreated hollow glass microspheres; then adding 80-140 parts by weight of 20-40wt% ethanol aqueous solution and 0.5-2 parts by weight of coupling agent, stirring at 80-90° C. and 400-600 rpm for 1-3 h, washing, and drying to obtain modified hollow glass microspheres;

[0024] S2: 30-60 parts by weight of water and 0.5-2 parts by weight of disodium lauryl sulfosuccinate are mixed, stirred at 20-30° C. and 600-1000 rpm for 5-20 min, 2-7 parts by weight of N-hydroxymethyl (methyl) acrylamide, 2-4 parts by weight of acrylic acid, 2-5 parts by weight of maleic acid, 3-6 parts by weight of methyl methacrylate, 5-10 parts by weight of diethylene glycol monoacrylate, and 0.05-0.4 parts by weight of dodecyl mercaptan are added, and stirred at 300-600 rpm for 10-40 min to obtain a mixed solution A;

[0025] S3: In a nitrogen atmosphere, 50-80 parts by weight of water, 0.5-1.5 parts by weight of disodium lauryl sulfosuccinate, and 0.1-0.3 parts by weight of potassium carbonate are mixed, stirred at 60-80° C. and 100-300 rpm for 10-30 min, 10-16 parts by weight of the mixed solution A and 10-15 parts by weight of a 1-3 wt% azoisobutylcyanamide ethanol solution are added, stirred at 70-90° C. and 100-400 rpm for 0.5-2 h, cooled, filtered, and then washed with a 3-8 wt% hot sodium chloride aqueous solution, filtered with a vacuum pump, washed, and dried to obtain a porous copolymer;

[0026] S4 Under nitrogen protection, 3-8 parts by weight of the modified hollow glass microspheres, 4-9 parts by weight of the porous copolymer, 0.3-1 parts by weight of ethylenediamine and 60-120 parts by weight of anhydrous ethanol are mixed, stirred at 20-30°C and 300-500rpm for 1-3h, then stirred at 70-90°C and 300-600rpm for 3-6h, and the solvent is distilled off under reduced pressure to obtain porous copolymer modified hollow glass microspheres.

[0027] The coupling agent is any one of aminosilane and hydroxysilane.

[0028] The aminosilane is at least one of N-(6-aminohexyl)aminomethyltriethoxysilane, 3-aminopropyltrimethylsilane, aminoethylaminoisobutylmethyldimethoxysilane, (3-aminopropyl)dimethylmethoxysilane, and trimethyl[(2-aminoethylamino)methyl]silane.

[0029] The hydroxysilane is any one of N-(3-acryloxy-2-hydroxypropyl)-3-aminopropyltriethoxysilane and 3-aminopropyltrihydroxysilane.

[0030] Preferably, the coupling agent is a mixture of N-(3-acryloxy-2-hydroxypropyl)-3-aminopropyltriethoxysilane and N-(3-acryloxy-2-hydroxypropyl)-3-aminopropyltriethoxysilane in a mass ratio of 1:(1.2-2).

[0031] The preparation method of the environmentally friendly sound insulation coating is as follows: rubber powder, hydroxypropyl methylcellulose and water are mixed, stirred at 600-100rpm for 20-50min, acrylic elastic emulsion, water-based polyurethane resin, polyamide, preservative, sodium stearate, defoaming agent are added, stirred at 800-1500rpm for 20-50min, and finally sound insulation material is added and stirred for 5-20min to obtain the environmentally friendly sound insulation coating.

[0032] Beneficial effects of the present invention:

[0033] 1. The present invention mainly uses acrylic elastic emulsion and waterborne polyurethane resin as main raw materials, and utilizes the elasticity and flexibility of the two, which enables the coating to form a soft and elastic coating after construction, which helps to absorb and weaken the incoming sound waves, thereby improving the sound insulation effect. Adding polyamide and preservatives can not only improve the adhesion of the coating, but also maintain good bonding performance and corrosion resistance at high temperatures, long service life, and avoid cracking and falling off problems caused by long-term use.

[0034] 2. The present invention adds porous copolymer-modified hollow glass microspheres to the environmentally friendly sound insulation coating, utilizing the porous copolymer having good sound insulation properties and its pore structure capable of absorbing and scattering sound waves, thereby modifying the sound insulation and good dispersion properties of the hollow glass microspheres. At the same time, the prepared porous copolymer-modified hollow glass microspheres are not only well dispersed in the environmentally friendly sound insulation coating, but also have good compatibility with the system, and can effectively improve the adhesion and sound insulation properties of the environmentally friendly sound insulation coating. The two synergistically enhance the sound insulation effect of the coating.

[0035] 3. The present invention is simple to prepare, has a feasible process, low production cost, is environmentally friendly and economical, and has good economic, ecological and social benefits. DETAILED DESCRIPTION

[0036] The above content of the present invention is further described in detail below in conjunction with specific implementation modes, but this should not be understood as the scope of the above subject matter of the present invention being limited to the following embodiments.

[0037] Introduction of some raw materials in this application:

[0038] Acrylic elastic emulsion was purchased from Shandong Guohua Chemical Co., Ltd., model: WF-800.

[0039] Waterborne polyurethane resin was purchased from Guangzhou Ruilin New Materials Co., Ltd., item number: 20245694.

[0040] Polyamide was purchased from Suzhou Xindezhi New Materials Co., Ltd. with the brand name: UBESTA3030JLX1.

[0041] Hollow glass microspheres were purchased from Lingshou County Haibin Mineral Products Trading Co., Ltd., particle size: 100 mesh.

[0042] Example 1

[0043] The environmentally friendly sound-insulating coating is composed of the following raw materials in parts by weight: 50 parts by weight of acrylic elastic emulsion, 25 parts by weight of water-based polyurethane resin, 5 parts by weight of rubber powder, 8 parts by weight of hydroxypropyl methylcellulose, 2 parts by weight of polyamide, 2 parts by weight of 2-methyl-4-isothiazoline-3-one, 3 parts by weight of sodium stearate, 0.5 parts by weight of dimethyl silicone oil, 5 parts by weight of sound-insulating material, and 30 parts by weight of water.

[0044] The sound insulation material is hollow glass microspheres.

[0045] The preparation method of the environmentally friendly sound-insulating coating is as follows: rubber powder, hydroxypropyl methylcellulose and water are mixed, stirred at 800 rpm for 30 minutes, acrylic elastic emulsion, water-based polyurethane resin, polyamide, 2-methyl-4-isothiazoline-3-one, sodium stearate, and dimethyl silicone oil are added, and stirred at 1000 rpm for 30 minutes, and finally sound insulation material is added and stirred for 10 minutes to obtain the environmentally friendly sound-insulating coating.

[0046] Example 2

[0047] The environmentally friendly sound-insulating coating is composed of the following raw materials in parts by weight: 50 parts by weight of acrylic elastic emulsion, 25 parts by weight of water-based polyurethane resin, 5 parts by weight of rubber powder, 8 parts by weight of hydroxypropyl methylcellulose, 2 parts by weight of polyamide, 2 parts by weight of 2-methyl-4-isothiazoline-3-one, 3 parts by weight of sodium stearate, 0.5 parts by weight of dimethyl silicone oil, 5 parts by weight of sound-insulating material, and 30 parts by weight of water.

[0048] The sound insulation material is modified hollow glass microspheres. The preparation method of the modified hollow glass microspheres comprises the following steps: placing 10 parts by weight of hollow glass microspheres in 80 parts by weight of 0.8 mol / L hydrochloric acid, stirring at 85°C and 500 rpm for 45 minutes, adjusting the pH value to 7, centrifuging, and drying to obtain pretreated hollow glass microspheres; then adding 100 parts by weight of 30 wt% ethanol aqueous solution and 1 part by weight of N-(6-aminohexyl)aminomethyltriethoxysilane, stirring at 85°C and 500 rpm for 1.5 hours, washing, and drying to obtain modified hollow glass microspheres.

[0049] The preparation method of the environmentally friendly sound-insulating coating is as follows: rubber powder, hydroxypropyl methylcellulose and water are mixed, stirred at 800 rpm for 30 minutes, acrylic elastic emulsion, water-based polyurethane resin, polyamide, 2-methyl-4-isothiazoline-3-one, sodium stearate, and dimethyl silicone oil are added, and stirred at 1000 rpm for 30 minutes, and finally sound insulation material is added and stirred for 10 minutes to obtain the environmentally friendly sound-insulating coating.

[0050] Example 3

[0051] The environmentally friendly sound-insulating coating is composed of the following raw materials in parts by weight: 50 parts by weight of acrylic elastic emulsion, 25 parts by weight of water-based polyurethane resin, 5 parts by weight of rubber powder, 8 parts by weight of hydroxypropyl methylcellulose, 2 parts by weight of polyamide, 2 parts by weight of 2-methyl-4-isothiazoline-3-one, 3 parts by weight of sodium stearate, 0.5 parts by weight of dimethyl silicone oil, 5 parts by weight of sound-insulating material, and 30 parts by weight of water.

[0052] The sound insulation material is a porous copolymer, and the preparation method of the porous copolymer comprises the following steps:

[0053] S1: 40 parts by weight of water and 1 part by weight of disodium lauryl sulfosuccinate were mixed, and the mixture was stirred at 25° C. and 800 rpm for 10 min. Then, 4 parts by weight of N-hydroxymethyl (methyl) acrylamide, 2.5 parts by weight of acrylic acid, 3 parts by weight of maleic acid, 4 parts by weight of methyl methacrylate, 8 parts by weight of diethylene glycol monoacrylate, and 0.1 parts by weight of dodecyl mercaptan were added, and the mixture was stirred at 400 rpm for 20 min to obtain a mixed solution A.

[0054] S2: Under a nitrogen atmosphere, 60 parts by weight of water, 0.8 parts by weight of disodium lauryl sulfosuccinate and 0.15 parts by weight of potassium carbonate are mixed, stirred at 70°C and 200 rpm for 20 minutes, 12 parts by weight of the above mixed solution A and 12 parts by weight of 2 wt% azoisobutylcyanamide ethanol solution are added, stirred at 80°C and 200 rpm for 1 hour, cooled, filtered, washed with 5 wt% hot sodium chloride aqueous solution, filtered with a vacuum pump, washed and dried to obtain a porous copolymer.

[0055] The preparation method of the environmentally friendly sound-insulating coating is as follows: rubber powder, hydroxypropyl methylcellulose and water are mixed, stirred at 800 rpm for 30 minutes, acrylic elastic emulsion, water-based polyurethane resin, polyamide, 2-methyl-4-isothiazoline-3-one, sodium stearate, and dimethyl silicone oil are added, and stirred at 1000 rpm for 30 minutes, and finally sound insulation material is added and stirred for 10 minutes to obtain the environmentally friendly sound-insulating coating.

[0056] Example 4

[0057] The environmentally friendly sound-insulating coating is composed of the following raw materials in parts by weight: 50 parts by weight of acrylic elastic emulsion, 25 parts by weight of water-based polyurethane resin, 5 parts by weight of rubber powder, 8 parts by weight of hydroxypropyl methylcellulose, 2 parts by weight of polyamide, 2 parts by weight of 2-methyl-4-isothiazoline-3-one, 3 parts by weight of sodium stearate, 0.5 parts by weight of dimethyl silicone oil, 5 parts by weight of sound-insulating material, and 30 parts by weight of water.

[0058] The sound insulation material is a porous copolymer modified hollow glass microsphere, and the preparation method of the porous copolymer modified hollow glass microsphere comprises the following steps:

[0059] S1: placing 10 parts by weight of hollow glass microspheres in 80 parts by weight of 0.8 mol / L hydrochloric acid, stirring at 85°C and 500 rpm for 45 min, adjusting the pH value to 7, centrifuging, and drying to obtain pretreated hollow glass microspheres; then adding 100 parts by weight of 30 wt% ethanol aqueous solution and 1 part by weight of N-(6-aminohexyl)aminomethyltriethoxysilane, stirring at 85°C and 500 rpm for 1.5 h, washing, and drying to obtain modified hollow glass microspheres;

[0060] S2: 40 parts by weight of water and 1 part by weight of disodium lauryl sulfosuccinate were mixed, stirred at 25° C. and 800 rpm for 10 min, 4 parts by weight of N-hydroxymethyl (methyl) acrylamide, 2.5 parts by weight of acrylic acid, 3 parts by weight of maleic acid, 4 parts by weight of methyl methacrylate, 8 parts by weight of diethylene glycol monoacrylate, and 0.1 parts by weight of dodecyl mercaptan were added, and stirred at 400 rpm for 20 min to obtain a mixed solution A;

[0061] S3: Under a nitrogen atmosphere, 60 parts by weight of water, 0.8 parts by weight of disodium lauryl sulfosuccinate, and 0.15 parts by weight of potassium carbonate were mixed, stirred at 70° C. and 200 rpm for 20 min, 12 parts by weight of the mixed solution A and 12 parts by weight of a 2 wt% ethanol solution of azoisobutylcyanamide were added, stirred at 80° C. and 200 rpm for 1 h, cooled, filtered, and then washed with a 5 wt% hot sodium chloride aqueous solution, filtered with a vacuum pump, washed, and dried to obtain a porous copolymer;

[0062] S4 Under nitrogen protection, 5 parts by weight of the modified hollow glass microspheres, 6 parts by weight of the porous copolymer, 0.5 parts by weight of ethylenediamine and 80 parts by weight of anhydrous ethanol were mixed, stirred at 25°C and 400 rpm for 1.5 hours, then stirred at 80°C and 400 rpm for 4 hours, and the solvent was distilled off under reduced pressure to obtain porous copolymer modified hollow glass microspheres.

[0063] The preparation method of the environmentally friendly sound-insulating coating is as follows: rubber powder, hydroxypropyl methylcellulose and water are mixed, stirred at 800 rpm for 30 minutes, acrylic elastic emulsion, water-based polyurethane resin, polyamide, 2-methyl-4-isothiazoline-3-one, sodium stearate, and dimethyl silicone oil are added, and stirred at 1000 rpm for 30 minutes, and finally sound insulation material is added and stirred for 10 minutes to obtain the environmentally friendly sound-insulating coating.

[0064] Example 5

[0065] The environmentally friendly sound-insulating coating is composed of the following raw materials in parts by weight: 50 parts by weight of acrylic elastic emulsion, 25 parts by weight of water-based polyurethane resin, 5 parts by weight of rubber powder, 8 parts by weight of hydroxypropyl methylcellulose, 2 parts by weight of polyamide, 2 parts by weight of 2-methyl-4-isothiazoline-3-one, 3 parts by weight of sodium stearate, 0.5 parts by weight of dimethyl silicone oil, 5 parts by weight of sound-insulating material, and 30 parts by weight of water.

[0066] The sound insulation material is a porous copolymer modified hollow glass microsphere, and the preparation method of the porous copolymer modified hollow glass microsphere comprises the following steps:

[0067] S1: placing 10 parts by weight of hollow glass microspheres in 80 parts by weight of 0.8 mol / L hydrochloric acid, stirring at 85°C and 500 rpm for 45 min, adjusting the pH value to 7, centrifuging, and drying to obtain pretreated hollow glass microspheres; then adding 100 parts by weight of 30 wt% ethanol aqueous solution and 1 part by weight of N-(3-acryloxy-2-hydroxypropyl)-3-aminopropyltriethoxysilane, stirring at 85°C and 500 rpm for 1.5 h, washing, and drying to obtain modified hollow glass microspheres;

[0068] S2: 40 parts by weight of water and 1 part by weight of disodium lauryl sulfosuccinate were mixed, stirred at 25° C. and 800 rpm for 10 min, 4 parts by weight of N-hydroxymethyl (methyl) acrylamide, 2.5 parts by weight of acrylic acid, 3 parts by weight of maleic acid, 4 parts by weight of methyl methacrylate, 8 parts by weight of diethylene glycol monoacrylate, and 0.1 parts by weight of dodecyl mercaptan were added, and stirred at 400 rpm for 20 min to obtain a mixed solution A;

[0069] S3: Under a nitrogen atmosphere, 60 parts by weight of water, 0.8 parts by weight of disodium lauryl sulfosuccinate, and 0.15 parts by weight of potassium carbonate were mixed, stirred at 70° C. and 200 rpm for 20 min, 12 parts by weight of the mixed solution A and 12 parts by weight of a 2 wt% ethanol solution of azoisobutylcyanamide were added, stirred at 80° C. and 200 rpm for 1 h, cooled, filtered, and then washed with a 5 wt% hot sodium chloride aqueous solution, filtered with a vacuum pump, washed, and dried to obtain a porous copolymer;

[0070] S4 Under nitrogen protection, 5 parts by weight of the modified hollow glass microspheres, 6 parts by weight of the porous copolymer, 0.5 parts by weight of ethylenediamine and 80 parts by weight of anhydrous ethanol were mixed, stirred at 25°C and 400 rpm for 1.5 hours, then stirred at 80°C and 400 rpm for 4 hours, and the solvent was distilled off under reduced pressure to obtain porous copolymer modified hollow glass microspheres.

[0071] The preparation method of the environmentally friendly sound-insulating coating is as follows: rubber powder, hydroxypropyl methylcellulose and water are mixed, stirred at 800 rpm for 30 minutes, acrylic elastic emulsion, water-based polyurethane resin, polyamide, 2-methyl-4-isothiazoline-3-one, sodium stearate, and dimethyl silicone oil are added, and stirred at 1000 rpm for 30 minutes, and finally sound insulation material is added and stirred for 10 minutes to obtain the environmentally friendly sound-insulating coating.

[0072] Example 6

[0073] The environmentally friendly sound-insulating coating is composed of the following raw materials in parts by weight: 50 parts by weight of acrylic elastic emulsion, 25 parts by weight of water-based polyurethane resin, 5 parts by weight of rubber powder, 8 parts by weight of hydroxypropyl methylcellulose, 2 parts by weight of polyamide, 2 parts by weight of 2-methyl-4-isothiazoline-3-one, 3 parts by weight of sodium stearate, 0.5 parts by weight of dimethyl silicone oil, 5 parts by weight of sound-insulating material, and 30 parts by weight of water.

[0074] The sound insulation material is a porous copolymer modified hollow glass microsphere, and the preparation method of the porous copolymer modified hollow glass microsphere comprises the following steps:

[0075] S1: placing 10 parts by weight of hollow glass microspheres in 80 parts by weight of 0.8 mol / L hydrochloric acid, stirring at 85°C and 500 rpm for 45 min, adjusting the pH value to 7, centrifuging, and drying to obtain pretreated hollow glass microspheres; then adding 100 parts by weight of 30 wt% ethanol aqueous solution, 0.4 parts by weight of N-(6-aminohexyl)aminomethyltriethoxysilane, and 0.6 parts by weight of N-(3-acryloyloxy-2-hydroxypropyl)-3-aminopropyltriethoxysilane, stirring at 85°C and 500 rpm for 1.5 h, washing, and drying to obtain modified hollow glass microspheres;

[0076] S2: 40 parts by weight of water and 1 part by weight of disodium lauryl sulfosuccinate were mixed, stirred at 25° C. and 800 rpm for 10 min, 4 parts by weight of N-hydroxymethyl (methyl) acrylamide, 2.5 parts by weight of acrylic acid, 3 parts by weight of maleic acid, 4 parts by weight of methyl methacrylate, 8 parts by weight of diethylene glycol monoacrylate, and 0.1 parts by weight of dodecyl mercaptan were added, and stirred at 400 rpm for 20 min to obtain a mixed solution A;

[0077] S3: Under a nitrogen atmosphere, 60 parts by weight of water, 0.8 parts by weight of disodium lauryl sulfosuccinate, and 0.15 parts by weight of potassium carbonate were mixed, stirred at 70° C. and 200 rpm for 20 min, 12 parts by weight of the mixed solution A and 12 parts by weight of a 2 wt% ethanol solution of azoisobutylcyanamide were added, stirred at 80° C. and 200 rpm for 1 h, cooled, filtered, and then washed with a 5 wt% hot sodium chloride aqueous solution, filtered with a vacuum pump, washed, and dried to obtain a porous copolymer;

[0078] S4 Under nitrogen protection, 5 parts by weight of the modified hollow glass microspheres, 6 parts by weight of the porous copolymer, 0.5 parts by weight of ethylenediamine and 80 parts by weight of anhydrous ethanol were mixed, stirred at 25°C and 400 rpm for 1.5 hours, then stirred at 80°C and 400 rpm for 4 hours, and the solvent was distilled off under reduced pressure to obtain porous copolymer modified hollow glass microspheres.

[0079] The preparation method of the environmentally friendly sound-insulating coating is as follows: rubber powder, hydroxypropyl methylcellulose and water are mixed, stirred at 800 rpm for 30 minutes, acrylic elastic emulsion, water-based polyurethane resin, polyamide, 2-methyl-4-isothiazoline-3-one, sodium stearate, and dimethyl silicone oil are added, and stirred at 1000 rpm for 30 minutes, and finally sound insulation material is added and stirred for 10 minutes to obtain the environmentally friendly sound-insulating coating.

[0080] Test Example 1

[0081] Sound insulation effect test: Referring to the national standard GB / T19889.8-2006 "Acoustic Building and Building Component Sound Insulation Measurement Part 8: Laboratory Measurement of Impact Sound Improvement of Heavy Standard Floor Covering", the environmentally friendly sound insulation coatings prepared in Examples 1-5 were tested for sound insulation effect. The coating thickness was 5 mm, and the weighted standardized impact sound insulation volume of the 100 mm floor was measured. The sound insulation (dB) at different frequencies was tested respectively. Each group was tested 5 times and the average value was taken. The results are shown in Table 1.

[0082] Table 1 Test results of sound insulation effect of environmentally friendly sound insulation coatings

[0083]

[0084]

[0085] Test Example 2

[0086] Determination of harmful substance limits: The test was carried out in accordance with the national standard GB18582-2020 "Limits of harmful substances in building wall coatings". Each group was tested 5 times and the average value was taken. The results are shown in Table 2.

[0087] Table 2 Test results of harmful substance limits of environmentally friendly sound insulation coatings

[0088] VOC, g / L Free formaldehyde, mg / kg Example 1 34.9 21.5 Example 6 20.6 8.4

[0089] As can be seen from the above table, the environmentally friendly sound insulation coating prepared by the present invention has a good sound insulation effect. At the same time, the coating prepared by the present invention contains a volatile organic chemical (VOC) content far less than the 120g / L specified in the national standard, and the content of free formaldehyde is also far less than the national standard value of 100m / kg, which has good environmental performance. It can be clearly seen from Example 2, Example 3 and Example 6 that the present invention effectively combines the silane coupling agent modified hollow glass microspheres with the porous copolymer material, and utilizes the porous copolymer to have good sound insulation properties. Its pore structure can absorb and scatter sound waves, and the sound insulation and good dispersion properties of the modified hollow glass microspheres. The two synergistically enhance the sound insulation effect of the coating and improve the environmental performance of the coating. It can be seen from Examples 1-2 and 4 that after the silane-modified hollow glass microspheres are surface treated, their surface will have affinity, which helps to improve the adhesion between the microspheres and the porous copolymer, which helps to ensure that the two can be evenly dispersed in the coating to form a stable composite system. When combined with porous copolymers, the modified microbeads are more easily evenly dispersed in the pore structure of the copolymer, improving the dispersibility of hollow glass microbeads, reducing the agglomeration of microbeads, and increasing the surface area of ​​the coating, which can form a more complex acoustic structure, thereby improving the overall sound insulation performance. Through the synergistic effect of the silane-modified hollow glass microbeads and porous copolymers, the coating can fully utilize the lightweight properties of the microbeads, the surface properties of the silane modification, and the acoustic properties of the porous copolymer, thereby achieving a more efficient sound insulation effect. Due to the porous structure of the porous copolymer-modified hollow glass microbeads, harmful gases and free formaldehyde in the coating can be effectively adsorbed, which can improve the environmental protection effect of the coating. As can be seen from Example 4-6, the present invention utilizes N-(6-aminohexyl) aminomethyl triethoxy silane and N-(3-acryloxy-2-hydroxypropyl)-3-aminopropyl triethoxy silane to carry out composite, and the effect is obviously better than the technical effect of any one of them, and the possible reason is that N-(6-aminohexyl) aminomethyl triethoxy silane and N-(3-acryloxy-2-hydroxypropyl)-3-aminopropyl triethoxy silane contain different functional groups amino and hydroxyl, and they may synergize with each other in the modification process, form more complicated and effective surface modification, so as to improve the overall performance of modified microbead. Both they can form the functional group of affinity on the microbead surface, by using these two kinds of silane modification simultaneously, the adhesion of modified microbead and coating matrix and other components can be improved, and it is ensured that the microbead is evenly dispersed in the coating. Their functional group can react chemically with the microbead surface, reduce the adsorption force between the microbead, so as to prevent the reunion of the microbead, improve its dispersibility in the coating. This synergistic effect may lead to better results in the coating's sound insulation properties.

Claims

1. Environmentally friendly sound insulation coating, characterized in that: The invention is composed of the following raw materials: 30-60 parts by weight of acrylic elastic emulsion, 20-40 parts by weight of waterborne polyurethane resin, 3-8 parts by weight of rubber powder, 5-12 parts by weight of hydroxypropyl methylcellulose, 1-3 parts by weight of polyamide, 1-3 parts by weight of preservative, 2-5 parts by weight of sodium stearate, 0.3-1 parts by weight of defoaming agent, 3-8 parts by weight of sound insulation material, and 20-50 parts by weight of water, wherein the sound insulation material is porous copolymer modified hollow glass microspheres; The preparation method of the porous copolymer modified hollow glass microspheres comprises the following steps: S1 placing 8-12 parts by weight of hollow glass microspheres in 60-100 parts by weight of 0.5-1 mol / L hydrochloric acid, stirring at 80-100° C. and 400-600 rpm for 40-60 min, adjusting the pH value to 6.5-7.5, centrifuging, and drying to obtain pretreated hollow glass microspheres; then adding 80-140 parts by weight of 20-40wt% ethanol aqueous solution and 0.5-2 parts by weight of coupling agent, stirring at 80-90° C. and 400-600 rpm for 1-3 h, washing, and drying to obtain modified hollow glass microspheres; S2: 30-60 parts by weight of water and 0.5-2 parts by weight of disodium lauryl sulfosuccinate are mixed, stirred at 20-30° C. and 600-1000 rpm for 5-20 min, 2-7 parts by weight of N-hydroxymethyl (methyl) acrylamide, 2-4 parts by weight of acrylic acid, 2-5 parts by weight of maleic acid, 3-6 parts by weight of methyl methacrylate, 5-10 parts by weight of diethylene glycol monoacrylate, and 0.05-0.4 parts by weight of dodecyl mercaptan are added, and stirred at 300-600 rpm for 10-40 min to obtain a mixed solution A; S3: In a nitrogen atmosphere, 50-80 parts by weight of water, 0.5-1.5 parts by weight of disodium lauryl sulfosuccinate, and 0.1-0.3 parts by weight of potassium carbonate are mixed, stirred at 60-80° C. and 100-300 rpm for 10-30 min, 10-16 parts by weight of the mixed solution A and 10-15 parts by weight of a 1-3 wt% azoisobutylcyanamide ethanol solution are added, stirred at 70-90° C. and 100-400 rpm for 0.5-2 h, cooled, filtered, and then washed with a 3-8 wt% hot sodium chloride aqueous solution, filtered with a vacuum pump, washed, and dried to obtain a porous copolymer; S4 Under nitrogen protection, 3-8 parts by weight of the modified hollow glass microspheres, 4-9 parts by weight of the porous copolymer, 0.3-1 parts by weight of ethylenediamine and 60-120 parts by weight of anhydrous ethanol are mixed, stirred at 20-30°C and 300-500rpm for 1-3h, then stirred at 70-90°C and 300-600rpm for 3-6h, and the solvent is distilled off under reduced pressure to obtain porous copolymer modified hollow glass microspheres.

2. The environmentally friendly sound-proof coating according to claim 1, characterized in that: The preservative is at least one of 2-methyl-4-isothiazoline-3-one and 1,2-benzisothiazolin-3-one.

3. The environmentally friendly sound-proof coating according to claim 1, characterized in that: The defoaming agent is at least one of tributyl phosphate, trimesic acid ester, dimethyl silicone oil, polyoxypropylene glycerol ether, and ether defoaming agents.

4. The environmentally friendly sound-insulating coating according to claim 1, characterized in that: The coupling agent is any one of aminosilane and hydroxysilane.

5. The environmentally friendly sound-insulating coating according to claim 4, characterized in that: The aminosilane is at least one of N-(6-aminohexyl)aminomethyltriethoxysilane, 3-aminopropyltrimethylsilane, aminoethylaminoisobutylmethyldimethoxysilane, (3-aminopropyl)dimethylmethoxysilane, and trimethyl[(2-aminoethylamino)methyl]silane.

6. The environmentally friendly sound-insulating coating according to claim 4, characterized in that: The hydroxysilane is any one of N-(3-acryloxy-2-hydroxypropyl)-3-aminopropyltriethoxysilane and 3-aminopropyltrihydroxysilane.

7. The method for preparing the environmentally friendly sound-insulating coating according to any one of claims 1 to 6, characterized in that: The preparation method of the environmentally friendly sound insulation coating is as follows: rubber powder, hydroxypropyl methylcellulose and water are mixed and stirred, then acrylic elastic emulsion, water-based polyurethane resin, polyamide, preservative, sodium stearate and defoaming agent are added and stirred, and finally sound insulation material is added and stirred continuously to obtain the environmentally friendly sound insulation coating.

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