Modified mica powder-hydroxyapatite prefabricated slurry, preparation and application of modified mica powder-hydroxyapatite prefabricated slurry in multi-band sound-absorbing water-based decorative coating

Abstract

The invention belongs to the field of paint and paint raw material preparation, and mainly relates to modified mica powder-hydroxyapatite prefabricated slurry, preparation and application of the modified mica powder-hydroxyapatite prefabricated slurry in multi-band sound-absorbing water-based decorative paint. By manufacturing a mica-hydroxyapatite composite structure and adding the modified hard expanded perlite which is not easy to damage and the expandable microspheres, multi-frequency-band sound absorption from low frequency to high frequency is realized through cooperation of the mica-hydroxyapatite composite structure, the modified hard expanded perlite and the expandable microspheres; in addition, quartz sand is added, a rough paint film with a certain decoration effect is manufactured, the contact area of the surface of the paint film and sound waves is increased, and efficient sound absorption under the thin coating condition is achieved.

Description

Technical Field

[0001] The present invention belongs to the field of coating and coating raw material preparation, and mainly relates to a modified mica powder-hydroxyapatite prefabricated slurry, its preparation and application in a multi-band sound-absorbing water-based decorative coating. Background Art

[0002] People's demand for a quiet home life is increasing day by day. Traditional sound insulation and sound absorption boards are heavy in quality and occupy a large amount of indoor space. Existing sound absorption coatings have poor environmental protection, and the sound absorption effect, especially the sound absorption effect on medium and low-frequency noises, is not obvious. Therefore, there is an urgent need to develop a water-based coating with both environmental protection and good sound absorption performance to meet market demand and fill the gap in this technical field.

[0003] In the existing published literature:

[0004] 1. A liquid sound insulation coating (CN111621204A): Adding emulsified asphalt and a large amount of rubber powder, with low cost but strong odor, can only be used in the industrial installation field and is used as an adhesive between substrates and interfaces such as tiles.

[0005] 2. A sound absorption coating and its preparation method (CN113736321A): Adding mineral fibers to create a pore structure, which is too idealistic, and is mainly applied in the field of fire resistance and combustion resistance. The sound absorption and sound insulation effects of each example and comparative example do not have an obvious gap.

[0006] 3. A heat-insulating and sound-absorbing paste for roofs and its preparation method (CN114196237A): Adding coarse Poraver beads and fine Poraver beads as sound absorption aids, with a 3-cm thick coating, high energy consumption and high cost, which does not conform to the green building material concept of resource conservation.

[0007] 4. A sound absorption coating and its preparation method (CN102220057A): A two-component sound absorption system of polystyrene foam crushed particles and sepiolite, with a complex process and long steps, and no description of sound absorption performance. Summary of the Invention

[0008] In order to solve the above technical problems, the present invention provides a modified mica powder-hydroxyapatite prefabricated slurry, its preparation and application in a multi-band sound-absorbing water-based decorative coating, solves the technical problems such as large thickness and narrow sound absorption range of sound absorption materials in the traditional building materials field, meets consumers' yearning for a beautiful and quiet home life, and at the same time, the water-based decorative coating described in the present invention has a certain frosted decorative effect.

[0009] To solve the above problems, the present invention is achieved through the following technical solutions:

[0010] The first object of the present invention is:

[0011] Provided is a modified mica powder-hydroxyapatite prefabricated slurry, which comprises the following components in parts by weight:

[0012] 30-45 parts of water, 0.6-1.5 parts of thickener, 0.1-0.25 parts of pH regulator, 0.3-0.9 parts of dispersant, 0.15-0.6 parts of defoamer, 25-40 parts of modified mica powder, 15-30 parts of hydroxyapatite, 0.05-0.15 parts of bactericide.

[0013] Preferably:

[0014] 40.62 parts of water, 1 part of thickener, 0.16 parts of pH regulator, 0.7 parts of dispersant, 0.4 parts of defoamer, 36 parts of modified mica powder, 21 parts of hydroxyapatite, 0.12 parts of bactericide.

[0015] The further optimization of the modified mica powder-hydroxyapatite prefabricated slurry of the present invention is:

[0016] The said modified mica powder comprises the following preparation steps:

[0017] Put an appropriate amount of mica powder into a muffle furnace, calcine at 450 °C for 2 h, cool it and then place it in a 2M KOH or 3M H2SO4 solution, stir at 60 °C for 4 h, filter and rinse it clean. Then place the filter residue in a CTAB solution, stir at 50 °C for 8 h, filter the obtained product, wash and soak it with ethanol, ultrasonicate for 15 min, filter and dry it to obtain a monolayer of modified mica powder with hydroxyl-rich surface.

[0018] H2SO4 dissociates into H + , which can combine with K + in mica powder for replacement, destroying the interlayer force and making it easy to exfoliate into a monolayer. And the free K + dissociated by KOH, because its volume is smaller than the combined K + in mica and is free and active, so it can also slightly destroy the mica interlayer interaction.

[0019] The further optimization of the modified mica powder-hydroxyapatite prefabricated slurry of the present invention is:

[0020] It comprises the combination of one or several of the following features:

[0021] The said thickener is hydrophobically modified hydroxyethyl cellulose and bentonite;

[0022] The said pH regulator is butyldiethanolamine;

[0023] The said dispersant is sodium polyacrylate salt;

[0024] The said defoamer is a mineral oil / silicone composite defoamer;

[0025] The average particle size of the modified mica powder is 17.5 μm;

[0026] The hydroxyapatite is a golf porous spherical structure obtained by acidification and recrystallization treatment of calcium carbonate;

[0027] The fungicide is 2-methyl-4-isothiazolin-3-one.

[0028] The second object of the present invention is:

[0029] To provide a preparation method of a modified mica powder-hydroxyapatite prefabricated slurry:

[0030] It includes the following preparation steps:

[0031] Add a part of water into a container, stir at a speed of 400 r / min, add a thickener, a pH regulator, a dispersant, a part of an antifoaming agent, modified mica powder, and hydroxyapatite, adjust the speed to 800 r / min and stir for 15 min, then add a fungicide, the remaining part of the antifoaming agent and the remaining part of the water, and continue to stir for 15 min to obtain a modified mica powder-hydroxyapatite slurry.

[0032] The third object of the present invention is:

[0033] To provide a multi-band sound-absorbing water-based decorative coating, which comprises the following components in parts by weight:

[0034] 20-40 parts of water, 0.5-2.0 parts of thickener, 0.1-0.3 parts of pH regulator, 0.4-0.8 parts of dispersant, 0.3-0.6 parts of wetting agent, 0.2-0.7 parts of antifoaming agent, 6-12 parts of pigment filler, 0.4-1.2 parts of expandable microspheres, 18-30 parts of the above-mentioned modified mica powder-hydroxyapatite slurry, 0.15-0.3 parts of bactericidal and preservative agent, 8-16 parts of emulsion, 0.3-1.2 parts of film-forming aid, 0.6-1.2 parts of wood fiber, 10-18 parts of hard expanded perlite, 4-10 parts of quartz sand;

[0035] The emulsion is an elastic acrylic emulsion.

[0036] Preferably:

[0037] 30 - 32 parts of water, 1.5 - 1.8 parts of thickener, 0.25 - 0.3 parts of pH regulator, 0.6 - 0.7 parts of dispersant, 0.4 - 0.6 parts of wetting agent, 0.5 - 0.6 parts of defoamer, 8 - 10 parts of pigment and filler, 0.8 - 1.0 parts of expandable microspheres, 22 - 26 parts of the aforementioned modified mica powder - hydroxyapatite slurry, 0.15 - 0.3 parts of bactericidal and preservative agent, 10 - 12 parts of emulsion, 0.8 - 1.0 parts of film - forming aid, 0.9 - 1.0 parts of wood fiber, 12 - 14 parts of hard expanded perlite, 6 - 8 parts of quartz sand;

[0038] The emulsion mentioned above is an elastic acrylic emulsion.

[0039] The further optimization of the multi - band sound - absorbing water - borne decorative coating of the present invention is as follows:

[0040] It includes the combination of one or several of the following features:

[0041] The thickener mentioned above is one or a combination of hydroxyethyl cellulose, hydrophobically modified hydroxyethyl cellulose, alkali - swellable thickener and acrylic - based alkali - soluble emulsion - associative thickener;

[0042] The pH regulator mentioned above is butyldiethanolamine;

[0043] The dispersant mentioned above is sodium polyacrylate salt;

[0044] The defoamer mentioned above is one or a combination of mineral oil - type defoamers and metal soap - type defoamers;

[0045] The pigment and filler mentioned above is one or a combination of heavy calcium carbonate, talc powder and titanium dioxide;

[0046] The expandable microspheres mentioned above include a thermoplastic shell encapsulating liquid hydrocarbon;

[0047] The bactericidal and preservative agent mentioned above is one or a combination of 2 - methyl - 4 - isothiazolin - 3 - one, 5 - chloro - 2 - methyl - 4 - isothiazolin - 3 - one and 1,2 - benzisothiazolin - 3 - one;

[0048] The film - forming aid mentioned above is an ester mixture;

[0049] The particle size of the quartz sand mentioned above is 80 - 120 mesh.

[0050] The fourth object of the present invention is:

[0051] To provide a preparation method of the multi - band sound - absorbing water - borne decorative coating mentioned above:

[0052] It includes the following preparation steps:

[0053] A. Add a portion of water to the container and stir at a speed of 400 r / min. Then add a thickening agent, a pH regulator, a dispersant, a wetting agent, an antifoaming agent, pigments and fillers, expandable microspheres, and a modified mica powder-hydroxyapatite slurry, and adjust the speed to 1500 r / min and stir for 15 min.

[0054] B. Adjust the speed to 800 r / min, add an emulsion, a film-forming aid, a bactericide and preservative, wood fibers, expanded perlite, quartz sand with a mesh size of 80-120, and the remaining portion of water, and stir for 10 min to prepare a multi-band sound-absorbing water-based decorative coating.

[0055] The multi-band sound-absorbing water-based decorative coating and its preparation method of the present invention have the following characteristics:

[0056] An elastic acrylic emulsion (the elastic acrylic emulsion refers to an emulsion interpenetrating network type acrylate thermoplastic elastomer) is used. By manufacturing a mica-hydroxyapatite composite structure, adding modified hard expanded perlite that is not easily damaged and expandable microspheres, the three cooperate to achieve multi-band sound absorption from low frequency to high frequency. Quartz sand is added to manufacture a rough paint film with a certain decorative effect, increasing the contact area between the paint film surface and sound waves, and achieving efficient sound absorption under the condition of thin coating.

[0057] For the multi-band sound-absorbing water-based decorative coating and its preparation method of the present invention, the construction of the delicate structure in the formula and the formula design of the multi-band sound-absorbing water-based decorative coating improve the sound-absorbing aids, and achieve multi-band noise absorption under the condition of thin coating. Specific Embodiments

[0058] In order to make the application, technical solutions and advantages of the present invention clearer and more understandable, the content of the present invention will be described in detail in combination with specific embodiments. It should be understood that the embodiments are only used to illustrate the present invention, rather than limiting the protection scope of the present invention. Any simple improvement to the preparation method of the present invention under the premise of the present invention's concept belongs to the protection scope of the present invention.

[0059] For the modified mica powder-hydroxyapatite prefabricated slurry in the present invention, the sources of its various components are as follows:

[0060] Thickening agent: Ashland (China) Investment Co., Ltd., white or light yellow powder;

[0061] pH regulator: Eastman (China) Investment Management Co., Ltd., colorless transparent liquid;

[0062] Dispersant: Sanyo Chemical Industries (Nantong) Co., Ltd., colorless or light yellow transparent liquid;

[0063] Antifoaming agent: San Nopco Limited, light yellow liquid;

[0064] Mica powder: Chuzhou Greentec Minerals Co., Ltd., white powder;

[0065] Hydroxyapatite: Omya (Shanghai) Investment Co., Ltd., white powder;

[0066] Bactericide: Dow Chemical (China) Co., Ltd., colorless or light green liquid.

[0067] For the multi-band sound-absorbing waterborne decorative coating in the present invention, the sources of its various components are as follows:

[0068] Thickener: Ashland (China) Investment Co., Ltd., white or light yellow powder;

[0069] pH regulator: Eastman (China) Investment Management Co., Ltd., colorless transparent liquid;

[0070] Dispersant: Sanyo Chemical (Nantong) Co., Ltd., colorless or light yellow transparent liquid;

[0071] Defoamer: San Nopco Limited, light yellow liquid;

[0072] Titanium dioxide: Chemours Chemical (Shanghai) Co., Ltd., white powder;

[0073] Talc powder: Haicheng Chengxin Microfine Powder Factory, white powder;

[0074] Film-forming aid: Shengxinghang Chemical (Shanghai) Co., Ltd., colorless liquid;

[0075] Emulsion: Badfu Group Co., Ltd., milky white liquid;

[0076] Hydroxyapatite: Omya (Shanghai) Investment Co., Ltd., white powder;

[0077] Expanded perlite: Omya (Shanghai) Investment Co., Ltd., white powder;

[0078] Bactericidal and preservative agent: Dow Chemical (China) Co., Ltd., white liquid.

[0079] Example 1

[0080] The multi-band sound-absorbing waterborne decorative coating provided in this example, calculated according to the weight ratio, includes:

[0081] 0.5 parts of hydroxyethyl cellulose, 0.3 parts of alkali-swellable thickener, 0.4 parts of acrylic-based alkali-soluble emulsion associative thickener, 0.3 parts of pH regulator, 0.7 parts of dispersant, 0.6 parts of wetting agent, 0.6 parts of defoamer, 4 parts of titanium dioxide, 5 parts of talc powder, 1 part of expandable microspheres, 24 parts of modified mica powder-hydroxyapatite slurry, 0.18 parts of bactericidal and preservative agent, 12 parts of emulsion, 0.9 parts of film-forming aid, 1 part of wood fiber, 14 parts of hard expanded perlite, 6 parts of quartz sand, and the balance is water; the total weight is 100 parts.

[0082] It includes the following preparation steps:

[0083] A. Add a part of water to a container, stir at a speed of 400 r / min, add thickener, pH regulator, dispersant, wetting agent, defoamer, titanium dioxide, expandable microspheres, modified mica powder-hydroxyapatite slurry, and talc powder, and adjust the speed to 1500 r / min and stir for 15 min;

[0084] B. Adjust the speed to 800 r / min, add emulsion, film-forming aid, bactericidal and preservative agent, wood fiber, hard expanded perlite, quartz sand and the remaining part of water, and stir for 10 min to prepare a multi-band sound-absorbing water-based decorative coating.

[0085] The modified mica powder described therein includes the following preparation steps:

[0086] Place an appropriate amount of mica powder in a muffle furnace, calcine at 450 °C for 2 h, cool and place it in a 2M KOH or 3M H2SO4 solution, stir at 60 °C for 4 h, filter and wash it clean, then place the filter residue in a CTAB solution, stir at 50 °C for 8 h, filter the obtained product, wash and soak it with ethanol, ultrasonicate for 15 min, filter and dry to obtain monolayer modified mica powder with rich hydroxyl groups on the surface.

[0087] The present invention also includes Example 2 and Example 3:

[0088] The raw material compositions and preparation methods of Example 1, Example 2 and Example 3 are basically the same, and the main difference lies in the differences in the amounts of some raw materials. See Table 1 for details.

[0089] Comparative Example 1:

[0090] The raw material composition and preparation method of Comparative Example 1 are basically the same as those of Example 1, and the main difference is that Comparative Example 1 does not add expandable microspheres and wood fiber. See Table 1 for details.

[0091] Comparative Example 2:

[0092] The raw material composition and preparation method of Comparative Example 2 are basically the same as those of Example 1, and the main difference is that Comparative Example 2 does not add quartz sand. See Table 1 for details.

[0093] Comparative Example 3:

[0094] Comparative Example 3 is basically the same as Example 1 in terms of raw material composition and preparation method. The main difference is that the emulsion used in Comparative Example 3 is different, and its minimum film-forming temperature is 26°C. See Table 1 for details.

[0095] Comparative Example 4:

[0096] Comparative Example 4 is basically the same as Example 1 in terms of raw material composition and preparation method. The main difference is that Comparative Example 4 does not add hard expanded perlite. See Table 1 for details.

[0097] Comparative Example 5:

[0098] Comparative Example 5 is basically the same as Example 1 in terms of raw material composition and preparation method. The main difference is that Comparative Example 5 adds 9 parts of mica powder and 5 parts of hydroxyapatite, and does not add the modified mica powder-hydroxyapatite slurry. See Table 1 for details.

[0099] Comparative Example 6:

[0100] Comparative Example 6 is basically the same as Example 1 in terms of raw material composition and preparation method. The main difference is that Comparative Example 6 adds 9 parts of modified mica powder and 5 parts of hydroxyapatite, does not add the modified mica powder-hydroxyapatite slurry, and uses expanded perlite instead of hard expanded perlite. See Table 1 for details.

[0101] Comparative Example 7:

[0102] Comparative Example 7 is basically the same as Example 1 in terms of raw material composition and preparation method. The main difference is that in Comparative Example 7, the preparation process of the modified mica powder does not undergo KOH treatment.

[0103] Table 1 Formulations of Examples 1-3 and Comparative Examples 1-7

[0104]

[0105]

[0106] Emulsion 1 is an elastic acrylic emulsion with Tg = 0°C; Emulsion 2 is an acrylic emulsion with Tg = 26°C.

[0107] Table 2 Comparison of Appearance and Workability of Examples 1-3 and Comparative Examples 1-7

[0108]

[0109] From the comparison between Example 1 and Comparative Example 2, it can be seen that quartz sand effectively improves the surface roughness, forms an artistic decorative effect on the film surface, and increases the contact area with sound waves.

[0110] From the comparison between Example 1 and Comparative Example 1, it can be seen that wood fiber and expandable microspheres can effectively improve the tensile strength of the paint film and have the effect of preventing the paint film from cracking.

[0111] From the comparison between Example 1 and Comparative Example 3, it can be seen that it is difficult to form a continuous paint film when using an emulsion with a relatively high glass transition temperature.

[0112] From the comparison between Example 1 and Comparative Example 5, when mica powder and hydroxyapatite are added separately and when they are added after first preparing a pre-slurry, the two have the same paint film appearance and decorative properties. From the comparison between Example 1 and Comparative Example 6, the hard expanded perlite + modified mica-hydroxyapatite slurry and the expanded perlite + modified mica + hydroxyapatite have the same paint film appearance and decorative properties.

[0113] From the comparison between Example 1 and Comparative Example 7, the modified mica powder-hydroxyapatite slurry without KOH treatment and the modified mica powder-hydroxyapatite slurry treated with KOH have the same paint film appearance and decorative properties.

[0114] Table 3 Comparison of sound absorption coefficients of Examples 1-3 and Comparative Examples 1-7 at different frequencies

[0115]

[0116] The test standard is GB / T 18696.2-2002. The sample diameter of the circular paint flakes prepared is 2.9 cm and the thickness is 0.5 cm.

[0117] From the comparison between Examples 1-3 and Comparative Examples 1-7, relevant conclusions about the sound absorption coefficient of the composition can be obtained, that is:

[0118] KOH is very helpful for preparing single-layer mica powder and improving the sound absorption coefficient. The single-layer structure with rich hydroxyl groups on the surface obtained by modifying mica powder can interact with hydroxyapatite to form flexible hydrogen bond forces. The slidable structure formed by the combination of the two can effectively absorb sound waves in the low-frequency band and convert sound energy into frictional heat energy; while the modified mica powder and hydroxyapatite without pre-mixing preferentially combine with other dispersants in the composition, thus losing their sound absorption effect.

[0119] In addition, hard expanded perlite has a relatively large pore structure and can significantly absorb sound waves in the high-frequency band, converting the high-frequency sound energy into heat energy of the air in the pores. Compared with expanded perlite, hard expanded perlite can maintain its pore structure undamaged during high-speed stirring.

[0120] In summary, through the technical adjustment and improvement of this technical solution, better sound absorption effects can be obtained while ensuring that the appearance and decorative properties of the paint film are not affected.

[0121] The present invention cannot describe all possible combinations. However, as long as there is no contradiction in the combination of these technical features, it should be considered as falling within the scope described in this specification.

[0122] For the experimental methods without specific conditions noted in the present invention, they are generally in accordance with conventional conditions or the conditions recommended by the manufacturer.

[0123] For various optimized technical solutions in the present invention, unless otherwise stated, the various optimized technical solutions can be combined with each other.

[0124] Unless otherwise stated, percentages and parts are weight percentages and weight parts.

[0125] For the experimental methods without specific conditions noted in the specification and the embodiments, they are generally in accordance with conventional conditions or the conditions recommended by the manufacturer.

[0126] Unless otherwise defined, all professional and scientific terms used herein have the same meaning as those familiar to persons skilled in the art. In addition, any methods and materials similar or equivalent to the described content can be applied to the method of the present invention.

Claims

1. A modified mica powder-hydroxyapatite prefabricated slurry, characterized in that: It comprises the following components in parts by weight: 30-45 parts of water, 0.6-1.5 parts of thickener, 0.1-0.25 parts of pH regulator, 0.3-0.9 parts of dispersant, 0.15-0.6 parts of defoamer, 25-40 parts of modified mica powder, 15-30 parts of hydroxyapatite, 0.05-0.15 parts of bactericide.

2. The modified mica powder-hydroxyapatite precast slurry according to claim 1, characterized in that: The modified mica powder described above comprises the following preparation steps: Put an appropriate amount of mica powder into a muffle furnace, calcine at 450 °C for 2 h, cool it and then place it in a 2M KOH or 3M H2SO4 solution, stir at 60 °C for 4 h, filter and rinse it clean. Then place the filter residue in a CTAB solution, stir at 50 °C for 8 h, filter the obtained product, wash and soak it with ethanol, ultrasonicate for 15 min, filter and dry it to obtain a monolayer modified mica powder with rich hydroxyl groups on the surface.

3. The modified mica powder-hydroxyapatite pre-slurry according to claim 1, wherein: It comprises the combination of one or several of the following features: The thickener is hydrophobic modified hydroxyethyl cellulose and bentonite; The pH regulator is butyldiethanolamine; The dispersant is sodium polyacrylate salt; The defoamer is a mineral oil / silicone composite defoamer; The average particle size of the modified mica powder is 17.5 μm; The hydroxyapatite is a golf porous spherical structure obtained by acidification and recrystallization treatment of calcium carbonate; The bactericide is 2-methyl-4-isothiazolin-3-one.

4. A preparation method of the modified mica powder-hydroxyapatite prefabricated slurry according to claim 1, characterized in that: It comprises the following preparation steps: Add a part of water into a container, stir at a speed of 400 r / min, add thickener, pH regulator, dispersant, a part of defoamer, modified mica powder, and hydroxyapatite, adjust the speed to 800 r / min and stir for 15 min. Then add bactericide, the remaining part of the defoamer and the remaining part of the water, continue to stir for 15 min to obtain a modified mica powder-hydroxyapatite slurry.

5. A multi-band sound-absorbing water-based decorative coating, characterized in that: It comprises the following components in parts by weight: 20-40 parts of water, 0.5-2.0 parts of thickener, 0.1-0.3 parts of pH regulator, 0.4-0.8 parts of dispersant, 0.3-0.6 parts of wetting agent, 0.2-0.7 parts of defoamer, 6-12 parts of pigment filler, 0.4-1.2 parts of expandable microspheres, 18-30 parts of the modified mica powder-hydroxyapatite slurry according to claim 1, 0.15-0.3 parts of bactericidal and preservative agent, 8-16 parts of emulsion, 0.3-1.2 parts of film-forming aid, 0.6-1.2 parts of wood fiber, 10-18 parts of hard expanded perlite, 4-10 parts of quartz sand; The emulsion is an elastic acrylic emulsion.

6. According to claim 5, the multi-band sound-absorbing water-based decorative coating is characterized in that: It comprises the combination of one or several of the following features: The thickener is one or a combination of several of hydroxyethyl cellulose, hydrophobic modified hydroxyethyl cellulose, alkali-swellable thickener and acrylic alkali-soluble emulsion associative thickener; The pH regulator is butyldiethanolamine; The dispersant is sodium polyacrylate; The defoamer is one or a combination of mineral oil defoamers and metal soap defoamers; The pigment extender is one or a combination of heavy calcium carbonate, talcum powder, and titanium dioxide; The expandable microspheres include a thermoplastic shell encapsulating a liquid hydrocarbon; The bactericidal and preservative agent is one or a combination of 2-methyl-4-isothiazolin-3-one, 5-chloro-2-methyl-4-isothiazolin-3-one, and 1,2-benzisothiazolin-3-one; The film-forming aid is an ester mixture; The particle size of the quartz sand is 80 - 120 mesh.

7. A method for preparing the multi-band sound-absorbing waterborne decorative coating according to claim 5, characterized in that: It comprises the following preparation steps: A. Add a part of water into a container, stir at a speed of 400 r / min, add a thickener, a pH regulator, a dispersant, a wetting agent, a defoamer, a pigment extender, expandable microspheres, and a modified mica powder-hydroxyapatite slurry, and adjust the speed to 1500 r / min and stir for 15 min; B. Adjust the speed to 800 r / min, add an emulsion, a film-forming aid, a bactericidal and preservative agent, wood fibers, expanded perlite, 80 - 120 mesh quartz sand, and the remaining part of water, and stir for 10 min to prepare the multi-band sound-absorbing waterborne decorative coating.

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