Anti-echo coating as well as preparation method and application thereof

Abstract

The invention relates to an anti-echo coating as well as a preparation method and application thereof. The anti-echo coating is prepared from components in parts by weight as follows: 28-38 parts of water-based inorganic resin, 5-10 parts of polymer emulsion, 5-10 parts of titanium dioxide, 10-15 parts of talcum powder, 3-6 parts of a flame retardant, 2-7 parts of expanded microspheres, 5-10 parts of hollow glass beads, 0.5-2 parts of polyethylene fibers, 1-3 parts of an aid and 10-40 parts of deionized water. According to the present invention, the anti-echo coating material is subjected to formula design, can effectively absorb, diffuse and reduce the reflected sound under the multi-component synergistic effect so as to achieve the technical effect of space echo noise reduction, further has characteristics of excellent flame resistance, condensation resistance, safety, low VOC content and the like, is suitable for indoor scenes, and has characteristics of environmental protection, environmental protection and the like. And a quiet and comfortable working environment is created.

Description

Technical Field

[0001] This invention relates to the field of coating technology, and in particular to an anti-echo coating, its preparation method, and its application. Background Technology

[0002] Echoes caused by sound wave reflection are prevalent in various settings, including architectural decoration, industrial plants, transportation hubs, and cinemas. These echoes not only interfere with voice communication and audio experience but can also lead to noise pollution and harm human hearing health. This is especially true in large commercial buildings such as hotels, office buildings, and commercial complexes, which often have multiple basements. Property management offices are typically located in these basements, where practicality is often prioritized and wall decorations are only required to meet basic aesthetic requirements. Office spaces with ordinary paint finishes often exhibit significant echo noise. This is because the underground spaces of buildings are typically constructed of concrete, with rigid reflective surfaces. Sound propagates and reflects within the space, creating echoes and reverberation. This sound is perceived as noise, affecting communication and sometimes causing irritability. Similar issues also occur in conference rooms, classrooms, and recording studios.

[0003] Existing soundproof coatings mainly achieve sound absorption and echo cancellation by constructing porous structures. Their technical approaches can be roughly divided into two categories: one is to use inorganic porous materials (such as diatomaceous earth, expanded perlite, and hollow glass microspheres) as fillers, combined with water-based resins (such as acrylic emulsions and VAE emulsions); the other is to use organic foaming systems (such as polyurethane foaming resins and PU expanded microspheres) to construct closed-cell or open-cell foam structures, and use the damping and loss effect of bubbles on sound waves to achieve sound cancellation.

[0004] However, existing technologies still have many shortcomings: First, inorganic filler-type coatings require the addition of a large amount of porous filler to ensure sound absorption, resulting in high coating viscosity, poor flowability during construction, easy cracking after film formation, decreased adhesion, and poor water and scrub resistance, making them unsuitable for humid environments; Second, organic foaming coatings have poor foaming structure stability and are prone to shrinkage and deformation due to temperature and humidity, resulting in significant attenuation of echo cancellation performance after long-term use, and some organic foaming agents have excessive VOC emissions, failing to meet green and environmental protection requirements; Third, existing anti-echo coatings mostly focus on a single sound absorption function, lacking adaptability to different frequency sound waves (especially mid-to-low frequency sound waves), resulting in inconsistent echo cancellation efficiency and difficulty in meeting the personalized acoustic needs of different scenarios.

[0005] Therefore, how to provide a soundproof coating that combines low VOC, excellent workability, stable film formation, wide frequency adaptability, and good weather resistance, temperature resistance, and fire resistance has become an urgent problem to be solved. Summary of the Invention

[0006] To address the aforementioned technical problems, this invention provides an anti-echo coating, its preparation method, and its application. By designing the formulation of the anti-echo coating, the multi-component synergistic effect can effectively absorb, diffuse, and reduce reflected sound, thereby achieving the technical effect of reducing spatial echo noise. Furthermore, the anti-echo coating provided by this invention also possesses excellent flame retardancy, anti-condensation properties, safety, and low VOC content, making it suitable for indoor settings and creating a quiet and comfortable working environment.

[0007] To achieve this objective, the present invention adopts the following technical solution:

[0008] In a first aspect, the present invention provides an anti-echo coating, which comprises the following components by weight: 28-38 parts of water-based inorganic resin, 5-10 parts of polymer emulsion, 5-10 parts of titanium dioxide, 10-15 parts of talc, 3-6 parts of flame retardant, 2-7 parts of expanded microspheres, 5-10 parts of hollow glass microspheres, 0.5-2 parts of polyethylene fiber, 1-3 parts of additives, and 10-40 parts of deionized water.

[0009] Among them, 28-38 portions can be, for example, 28 portions, 30 portions, 32 portions, 34 portions, 35 portions, 36 portions, or 38 portions; 5-10 portions can be, for example, 5 portions, 6 portions, 7 portions, 8 portions, 9 portions, or 10 portions; 10-15 portions can be, for example, 10 portions, 11 portions, 12 portions, 13 portions, 14 portions, or 15 portions; 3-6 portions can be, for example, 3 portions, 4 portions, 5 portions, or 6 portions; 2-7 portions can be, for example, 2 portions, 3 portions, 4 portions, 5 portions, 6 portions, or 7 portions; 0.5-2 portions can be, for example, 0.5 portions, 1 portion, 1.5 portions, or 2 portions; 1-3 portions can be, for example, 1 portion, 1.5 portions, 2 portions, 2.5 portions, or 3 portions; 10-40 portions can be, for example, 10 portions, 20 portions, 30 portions, or 40 portions.

[0010] This invention utilizes a water-based inorganic resin, which, compared to water-based organic resin emulsions, is non-flammable. The resulting anti-reverberation coating achieves a Class A flammability rating, and the VOC content of the water-based inorganic resin is close to zero, meeting green environmental protection regulations and making it suitable for interior decoration. This invention employs an anti-reverberation compound system of expanded microspheres, hollow glass microspheres, and polyethylene fibers. After curing, the coating forms a porous film with interconnected pores of interwoven fibers and particles. The porous network structure of the film generates friction and viscous motion between air molecules and pore walls as sound propagates, converting sound energy into heat energy, absorbing and reducing sound waves, and preventing echo reverberation noise. This invention limits the amount of polymer emulsion to 5-10 parts; further increases will lead to a decrease in the fire resistance of the coating. This invention also limits the amount of polyethylene fiber to 0.5-2 parts; further increases will result in excessively high viscosity of the coating, making it difficult to apply.

[0011] Preferably, the aqueous inorganic resin includes an acidic aqueous inorganic silicone resin.

[0012] Preferably, the viscosity of the aqueous inorganic resin is 1-10 mPa·s, for example, it can be 1 mPa·s, 2 mPa·s, 3 mPa·s, 4 mPa·s, 5 mPa·s, 6 mPa·s, 7 mPa·s, 8 mPa·s, 9 mPa·s or 10 mPa·s, etc.

[0013] Preferably, the pH value of the aqueous inorganic resin is 3-4.5, for example, it can be pH=3, pH=3.5, pH=4 or pH=4.5, etc.

[0014] Preferably, the polymer emulsion comprises a VAE emulsion.

[0015] Preferably, the minimum film-forming temperature of the VAE emulsion is -2 to 3°C.

[0016] Preferably, the solid content of the VAE emulsion is 50-60%, for example, it can be 50%, 52%, 54%, 55%, 56%, 58% or 60%, etc.

[0017] Preferably, the pH value of the VAE emulsion is 4.5-5.5, for example, it can be pH=4.5, pH=4.6, pH=4.8, pH=5, pH=5.2, pH=5.4 or pH=5.5, etc.

[0018] Preferably, the expanded microspheres comprise thermoplastic expanded microspheres.

[0019] Preferably, the D50 particle size of the expanded microspheres is 20-30 μm, for example, it can be 20 μm, 22 μm, 24 μm, 25 μm, 26 μm, 28 μm or 30 μm, etc.

[0020] Preferably, the expansion ratio of the expanded microspheres is 3-4 times, for example, it can be 3 times, 3.2 times, 3.4 times, 3.5 times, 3.6 times, 3.8 times or 4 times, etc.

[0021] Preferably, the density of the expanded microspheres is 33-39 g / L, for example, it can be 33 g / L, 34 g / L, 35 g / L, 36 g / L, 37 g / L, 38 g / L or 39 g / L, etc.

[0022] This invention uses thermoplastic expandable microspheres, which have excellent elasticity. When coated with a fibrous pore film composed of hollow glass microspheres and polyethylene fibers, sound propagates into the cavity. The deformation of the expandable microspheres under the action of sound waves increases the propagation damping and sound energy consumption, thus playing a good sound absorption role.

[0023] Preferably, the true density of the hollow glass microspheres is 350-400 g / L, for example, it can be 350 g / L, 360 g / L, 370 g / L, 380 g / L, 390 g / L or 400 g / L, etc.

[0024] Preferably, the D50 particle size of the hollow glass microspheres is 45-55 μm, for example, it can be 45 μm, 46 μm, 48 μm, 50 μm, 52 μm, 54 μm or 55 μm, etc.

[0025] Preferably, the polyethylene fiber comprises polyethylene cotton-like fibers.

[0026] Preferably, the length of the polyethylene cotton-like fiber monofilament is 1-1.5 mm, for example, it can be 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm or 1.5 mm, etc.

[0027] This invention utilizes polyethylene fibers, in conjunction with expanded microspheres and hollow glass microspheres, to construct a fibrous, hollow, interconnected coating structure resembling a "bird's nest." The thicker coating allows sound waves to travel a longer path and time after entering the coating's interior due to its intricate and extensive interconnected pores. The friction and viscous motion of air molecules against the pore walls converts sound energy into heat energy, resulting in highly efficient sound absorption and noise reduction. Preferably, polyethylene cotton-like fibers are used, as they provide superior sound absorption compared to chopped polyethylene fibers.

[0028] Preferably, the flame retardant comprises hydrated aluminum oxide and / or hydrated magnesium oxide.

[0029] Preferably, the D50 particle size of the flame retardant is 12-15 μm, for example, it can be 12 μm, 13 μm, 14 μm or 15 μm.

[0030] Preferably, the loss on ignition of the flame retardant is 30-40%.

[0031] Loss on ignition can be tested according to GB / T6609.2-2022.

[0032] Preferably, the additives include any one or a combination of at least two of the following: defoamers, dispersants, or fungicides.

[0033] The additives provided by the present invention may also include any one or a combination of at least two of the following: bactericides, rheology modifiers, thickeners, multifunctional additives, or film-forming aids.

[0034] In this invention, the defoamer, dispersant, bactericide, mildew inhibitor, rheology modifier, thickener, multifunctional additive or film-forming aid can be selected from conventional commercially available products.

[0035] In a second aspect, the present invention provides a method for preparing the anti-echo coating as described in the first aspect, the method comprising the following steps:

[0036] The components of the echo-blocking coating are mixed to obtain the echo-blocking coating.

[0037] Preferably, the preparation method includes:

[0038] (1) Add optional dispersant, optional mildew inhibitor and optional defoamer to deionized water in sequence and mix at a speed of 300-500 rpm (e.g., 300 rpm, 350 rpm, 400 rpm, 450 rpm or 500 rpm, etc.) for 15-20 min (e.g., 15 min, 16 min, 17 min, 18 min, 19 min or 20 min, etc.) to obtain mixture A;

[0039] (2) Add titanium dioxide, talc, and flame retardant to mixture A in sequence and mix at a stirring speed of 1000-1200 rpm (e.g., 1000 rpm, 1050 rpm, 1100 rpm, 1150 rpm, or 1200 rpm, etc.) for 30-40 min (e.g., 30 min, 32 min, 34 min, 35 min, 36 min, 38 min, or 40 min) to obtain mixture B;

[0040] (3) Add hollow glass microspheres, expanded microspheres and polyethylene fibers to mixture B in sequence and mix at a stirring speed of 300-500 rpm (e.g., 300 rpm, 350 rpm, 400 rpm, 450 rpm or 500 rpm, etc.) for 20-30 min (e.g., 20 min, 22 min, 24 min, 25 min, 26 min, 28 min or 30 min, etc.) to obtain mixture C;

[0041] (4) Add water-based inorganic resin and polymer emulsion to mixture C in sequence and mix at a stirring speed of 500-800 rpm (e.g., 500 rpm, 600 rpm, 700 rpm or 800 rpm, etc.) for 20-30 min (e.g., 20 min, 22 min, 24 min, 25 min, 26 min, 28 min or 30 min, etc.) to obtain the echo-proof coating.

[0042] Thirdly, the present invention provides an application of the echo-proof coating as described in the first aspect in the decoration of building interior spaces.

[0043] Compared with the prior art, the present invention has at least the following beneficial effects:

[0044] (1) The anti-echo coating provided by the present invention can effectively absorb, diffuse and reduce reflected sound through the synergistic effect of multiple components by formula design, thereby achieving the technical effect of reducing spatial echo noise.

[0045] (2) The anti-echo coating provided by the present invention has a low VOC content and excellent water resistance, alkali resistance, scrubbing resistance, mildew resistance and flame retardancy. It is highly safe and can be applied to indoor scenes, especially the interior decoration of office spaces in underground floors, conference rooms, classrooms, recording studios and other places. It can effectively reduce indoor space echo noise and has decorative, safety and flame retardancy properties, creating a quiet and comfortable working environment.

[0046] (3) Specifically, the sound-absorbing coating provided by the present invention has a sound absorption coefficient of 0.66-0.72, flame retardancy of Class A of GB8624-2012 standard, no abnormality in water resistance (168 h), no abnormality in alkali resistance (24 h), can be washed more than 2000 times, mildew resistance of Class 0-1 of GB / T1741-2020 standard, and KU viscosity of 107-124 with good workability. Attached Figure Description

[0047] Figure 1 The image shown is a scanning electron microscope (SEM) image of the cured anti-echo coating provided in Example 1 of this invention. The scale bar is 10 μm. Detailed Implementation

[0048] To facilitate understanding of the present invention, the following embodiments are provided. Those skilled in the art should understand that these embodiments are merely illustrative and should not be construed as limiting the scope of the invention.

[0049] The specific information of the materials used in the following specific embodiments of the present invention is as follows:

[0050] Waterborne inorganic resin: SIVO-140, purchased from EVONIK, viscosity 1-10 mPa.s (23℃), pH value 3-4.5;

[0051] VAE emulsion: Celvolit-1602, purchased from Celanese, minimum film-forming temperature is 0℃, solid content is 55%, pH value is 5;

[0052] PU expanded microspheres: Expansionl 461WE20d36, purchased from Nouryon, with a D50 particle size of 20-30 μm, an expansion ratio of 3-4, and a density of 33-39 g / L;

[0053] Hollow glass microspheres: GS40, purchased from China Steel Group, true density 400 g / L, D50 particle size 50 μm;

[0054] Polyethylene cotton-like fiber: SWP E620, purchased from MITSUI, with a monofilament length of 1.2 mm;

[0055] Flame retardant: FR3815, purchased from Hefei Zhongke, with a D50 particle size of 12-15 μm and a loss on ignition of 34.5%;

[0056] Titanium dioxide: SR-2377, purchased from Dongjia;

[0057] Talc powder: purchased from Ottoman;

[0058] Defoamer: Foamex 845, purchased from Evonik;

[0059] Dispersant: Dispers 755 W, purchased from Evonik;

[0060] Antifungal agent: ZPD1, purchased from Tor;

[0061] Acrylonitrile expanded microspheres, WE1501M, purchased from Crestron;

[0062] Waterborne organic resin, RS-7098, purchased from Badifu;

[0063] Pure acrylic emulsion, BLJ-960, purchased from Baolijia.

[0064] Examples 1-5

[0065] Examples 1-5 provide an anti-echo coating and its preparation method, respectively. The specific components of the anti-echo coating are shown in Table 1 (the amount of each component in Table 1 is by weight), where "--" indicates that the component was not added;

[0066] The preparation method includes:

[0067] (1) Dispersant Dispers 755 W, antifungal agent ZPD1 and defoamer Foamex 845 were added to deionized water in sequence and mixed at 400 rpm for 20 min to obtain mixture A;

[0068] (2) Add titanium dioxide SR-2377, talc powder and flame retardant FR3815 to mixture A in sequence and mix at a stirring speed of 1100 rpm for 35 min to obtain mixture B;

[0069] (3) Hollow glass microspheres GS40, expanded microspheres Expansionl 461WE20d36, and polyethylene cotton fibers SWP E620 were added to mixture B in sequence and mixed at a stirring speed of 400 rpm for 25 min to obtain mixture C;

[0070] (4) Add water-based inorganic resin SIVO-140 and VAE emulsion Celvolit-1602 to mixture C in sequence, and mix at a stirring speed of 600 rpm for 25 min to obtain the anti-echo coating.

[0071] Table 1

[0072]

[0073] This invention uses a scanning electron microscope (model Navigator 200) to characterize the cured film of the anti-echo coating provided in Example 1. The SEM images are shown below. Figure 1 As shown, the scale bar is 10 μm, from Figure 1 As can be seen from the above, the present invention adopts an anti-reverberation compound system of expanded microspheres, hollow glass microspheres and polyethylene fibers. After the coating is cured, a film with interconnected pores formed by interwoven fibers and particles is formed. The porous network structure of the film generates friction and viscous movement between air molecules and pore walls when sound propagates to the film, thereby converting sound energy into heat energy, absorbing and reducing sound waves, and avoiding the generation of echo reverberation noise.

[0074] Example 6

[0075] This embodiment provides an anti-echo coating and its preparation method, which differs from Embodiment 1 in that: the PU expanded microspheres are replaced with an equal amount of acrylonitrile expanded microspheres WE1501M.

[0076] Comparative Example 1

[0077] This comparative example provides an anti-echo coating and its preparation method. The difference from Example 1 is that the anti-echo coating does not contain PU expanded microspheres, the amount of hollow glass microspheres is adjusted to 11.1 parts by weight, and the amount of polyethylene cotton fiber is 2 parts by weight.

[0078] Comparative Example 2

[0079] This comparative example provides an anti-echo coating and its preparation method. The difference from Example 1 is that the anti-echo coating does not contain hollow glass microspheres, the amount of PU expanded microspheres is adjusted to 10.6 parts by weight, and the amount of polyethylene cotton fibers is 2.5 parts by weight.

[0080] Comparative Example 3

[0081] This comparative example provides an anti-echo coating and its preparation method. The difference from Example 1 is that the anti-echo coating does not contain polyethylene cotton fibers, the amount of PU expanded microspheres is adjusted to 5.6 parts by weight, and the amount of hollow glass microspheres is 7.5 parts by weight.

[0082] Comparative Example 4

[0083] This comparative example provides an anti-echo coating and its preparation method, which differs from Example 1 in that the amount of polyethylene cotton fibers is adjusted to 5 parts by weight.

[0084] Comparative Example 5

[0085] This comparative example provides an anti-echo coating and its preparation method, which differs from Example 1 in that the water-based inorganic resin is replaced with an equal amount of water-based organic resin RS-7098.

[0086] Comparative Example 6

[0087] This comparative example provides an anti-echo coating and its preparation method, which differs from Example 1 in that:

[0088] Replace the VAE emulsion with an equal amount of pure acrylic emulsion BLJ-960.

[0089] Test methods

[0090] The anti-echo coatings provided in the examples and comparative examples were cured at 23±2℃ for 7 days, and the coating thickness was 5 mm. The following performance tests were then conducted:

[0091] (1) Sound absorption coefficient: Tested according to GB / T18696.2-2002, sound frequency 500Hz-1kHz;

[0092] (2) Combustion performance: Tested in accordance with GB8624-2012;

[0093] (3) Water resistance: Tested according to GB / T9756-2018;

[0094] (4) Alkali resistance: Tested according to GB / T9756-2018;

[0095] (5) Scrub resistance: Tested in accordance with GB / T9756-2018;

[0096] (6) Resistance to mold: Tested according to GB / T1741-2020;

[0097] (7) Coating viscosity: Tested according to GB / T 9269-2009. KU viscosity exceeding 130 is not easy to apply.

[0098] The test results are shown in Table 2:

[0099] Table 2

[0100]

[0101] The test results show that:

[0102] (1) As can be seen from Examples 1 to 6, the anti-echo coating provided by the present invention can effectively absorb, diffuse and reduce reflected sound through the synergistic effect of multiple components by formula design, thereby achieving the technical effect of reducing spatial echo noise. It also has excellent flame retardant properties and properties such as water resistance, alkali resistance, scrubbing resistance and mildew resistance. Specifically, the anti-echo coating provided by the present invention has a sound absorption coefficient of 0.66-0.72, flame retardant performance that can reach Class A of GB8624-2012 standard, water resistance (168 h) without abnormality, alkali resistance (24 h) without abnormality, washability >2000, mildew resistance that can reach Class 0-1 of GB / T1741-2020 standard, and KU viscosity of 107-124 with good workability.

[0103] (2) As can be seen from Examples 1, 4-5 and Comparative Example 4, the present invention further limits the amount of polyethylene cotton fiber added. The addition of polyethylene cotton fiber can improve the anti-reverberation performance of the coating, but too much addition will lead to excessive viscosity of the coating and reduced workability.

[0104] (3) As can be seen from Examples 1 and 6, the present invention uses thermoplastic expandable microspheres. This type of expandable microsphere has excellent elasticity. When coated with a fiber pore film composed of hollow glass microspheres and polyethylene fibers, sound propagates into the cavity. The deformation of the expandable microspheres under the action of sound waves increases the propagation damping and sound energy consumption, thus playing a good sound absorption role.

[0105] (4) As can be seen from Example 1 and Comparative Examples 1-3, the present invention uses polyethylene fiber, together with expanded microspheres and hollow glass microspheres, to build a fibrous hollow interconnected coating structure similar to a "bird's nest". The thicker coating can extend the path and time of sound wave propagation after the sound waves enter the interior of the coating due to its intricate and long interconnected pores. The moving air molecules convert sound energy into heat energy through friction and viscous movement with the pore walls, thus playing a highly efficient sound absorption and noise reduction role. If any component is missing, the anti-reverberation performance of the coating will deteriorate.

[0106] (5) As can be seen from Example 1 and Comparative Example 5, the water-based inorganic resin used in this invention is non-flammable compared to water-based organic resin emulsion. The anti-echo coating prepared can achieve a combustion performance rating of Class A, and the VOC content of the water-based inorganic resin is close to 0, which meets the requirements of green environmental protection regulations.

[0107] (6) As can be seen from Example 1 and Comparative Example 6, the present invention uses a VAE emulsion with a pH value of 4.5-5.5, which is more compatible with the acidity and alkalinity of the water-based inorganic resin than a pure acrylic emulsion with a pH value of 7-9. This makes it less prone to flocculation and thus less likely to affect its use.

[0108] The applicant declares that the above description is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention fall within the protection and disclosure scope of the present invention.

Claims

1. An anti-echo coating, characterized in that, The anti-echo coating comprises the following components by weight: 28-38 parts of water-based inorganic resin, 5-10 parts of polymer emulsion, 5-10 parts of titanium dioxide, 10-15 parts of talc, 3-6 parts of flame retardant, 2-7 parts of expanded microspheres, 5-10 parts of hollow glass microspheres, 0.5-2 parts of polyethylene fiber, 1-3 parts of additives, and 10-40 parts of deionized water.

2. The anti-echo coating according to claim 1, characterized in that, The aqueous inorganic resin includes acidic aqueous inorganic silicone resin; Preferably, the viscosity of the aqueous inorganic resin is 1-10 mPa·s; Preferably, the pH value of the aqueous inorganic resin is 3-4.

5.

3. The anti-echo coating according to claim 1 or 2, characterized in that, The polymer emulsion includes a VAE emulsion; Preferably, the minimum film-forming temperature of the VAE emulsion is -2 to 3°C; Preferably, the solid content of the VAE emulsion is 50-60%; Preferably, the pH value of the VAE emulsion is 4.5-5.

5.

4. The anti-echo coating according to any one of claims 1-3, characterized in that, The expanded microspheres include thermoplastic expanded microspheres; Preferably, the D50 particle size of the expanded microspheres is 20-30 μm; Preferably, the expansion ratio of the expanded microspheres is 3-4 times; Preferably, the density of the expanded microspheres is 33-39 g / L.

5. The anti-echo coating according to any one of claims 1-4, characterized in that, The true density of the hollow glass microspheres is 350-400 g / L; Preferably, the hollow glass microspheres have a D50 particle size of 45-55 μm.

6. The anti-echo coating according to any one of claims 1-5, characterized in that, The polyethylene fibers include polyethylene cotton-like fibers; Preferably, the length of the single filament of the polyethylene cotton-like fiber is 1-1.5 mm; Preferably, the flame retardant comprises hydrated alumina flame retardant and / or hydrated magnesium oxide flame retardant; Preferably, the D50 particle size of the flame retardant is 12-15 μm; Preferably, the loss on ignition of the flame retardant is 30-40%.

7. The anti-echo coating according to any one of claims 1-6, characterized in that, The additives include any one or a combination of at least two of the following: defoamers, dispersants, or fungicides.

8. A method for preparing an echo-damping coating as described in any one of claims 1-7, characterized in that, The preparation method includes the following steps: The components of the echo-blocking coating are mixed to obtain the echo-blocking coating.

9. The method for preparing the anti-echo coating according to claim 8, characterized in that, The preparation method includes: (1) Add optional dispersant, optional mildew inhibitor and optional defoamer to deionized water in sequence and mix at 300-500 rpm for 15-20 min to obtain mixture A; (2) Add titanium dioxide, talc and flame retardant to mixture A in sequence and mix at a stirring speed of 1000-1200 rpm for 30-40 min to obtain mixture B; (3) Hollow glass microspheres, expanded microspheres and polyethylene fibers are added to mixture B in sequence and mixed at a stirring speed of 300-500 rpm for 20-30 min to obtain mixture C; (4) Add water-based inorganic resin and polymer emulsion to mixture C in sequence and mix at a stirring speed of 500-800 rpm for 20-30 min to obtain the anti-echo coating.

10. The application of an echo-damping coating as described in any one of claims 1-7 in the decoration of building interior spaces.

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