Quick-drying water-based damping coating composition and preparation method thereof

Abstract

The invention discloses a quick-drying water-based damping coating composition and a preparation method thereof. The quick-drying water-based damping coating composition is prepared from the following raw materials in parts by weight: 40 to 60 parts of hydroxyl acrylic dispersion, 5 to 10 parts of hydroxyl acrylic latex, 5 to 10 parts of damping latex, 5 to 10 parts of pigment, 20 to 30 parts of water, 5 to 10 parts of TiO2 nano composite hydrogel, 10 to 15 parts of filler, 0.05 to 0.1 part of defoaming agent, 0.2 to 0.5 part of dispersing agent and 0.2 to 0.5 part of sterilizing agent. According to the coating composition disclosed by the invention, the hydrophilic property of the hydroxyl acrylic latex is relatively strong, and the hydroxyl acrylic latex has relatively low viscosity and smudginess resistance, so that in a film forming process, water escapes outwards through pores of the TiO2 nano composite hydrogel and is transferred to the surface of a coating through a hydrophilic group of the hydroxyl acrylic latex; the hydroxyl acrylic latex and the TiO2 nano composite hydrogel have a synergistic effect, so that the drying time of the coating is greatly shortened, the problems that the coating is easy to stain and dust in the drying process of the coating are reduced, and the smoothness of the surface of the coating is greatly improved.

Description

Technical Field

[0001] The invention belongs to the technical field of chemical products and coating preparation, and particularly relates to a quick-drying water-based damping coating composition and a preparation method thereof. Background Art

[0002] Water-based paint refers to paint that uses water as a solvent or dispersion medium. Compared with traditional oil-based paint, water-based paint has the advantages of low VOC content, non-toxicity, environmental protection, and easy cleaning. Water-based damping paint is an environmentally friendly paint that plays a vibration reduction and noise reduction function. The paint is composed of acrylic IPN emulsion with a core-shell structure, damping pigments and fillers, flame retardants, additives, etc. Unlike sound-absorbing materials, it is an active noise reduction material. Its principle is to convert vibration mechanical energy into heat energy and dissipate it, that is, to effectively control vibration and noise from the sound source.

[0003] The Chinese patent application with application number CN201810239242.4 discloses a method for preparing a room temperature high-performance water-based damping coating and a product thereof, wherein the preparation method comprises: 1) preparing the following components in weight proportions: acrylic resin blended emulsion: 20-30; deionized water: 5-10; defoamer: 0.3-0.8; dispersant: 0.3-0.8; modified calcium carbonate filler: 80-325 mesh, 30-60; sericite powder: 100-600 mesh, 5-10; thickener: 0.4-0.6; wherein the acrylic resin blended emulsion is composed of a glass transition temperature of - 1) Three acrylic resin emulsions of 10 degrees, 20 degrees and 40 degrees are blended in a certain proportion; 2) The acrylic resin blended emulsion, deionized water, defoamer and dispersant are placed in a stirring container and stirred at 500 rpm for 5 minutes; 3) Modified calcium carbonate filler and sericite powder are added to the stirring container and stirred at 1000 rpm for 10 minutes; 4) The thickener is added to the stirring container and stirred at 1500 rpm for 10 minutes; 5) A high-performance water-based damping coating at room temperature is obtained, and the composite loss factor can be greater than 0.05 and the peak value can be greater than 0.2 in a wide temperature range of -10°C to 50°C. The coating prepared by this application can achieve high damping at room temperature, but the coating prepared by it cures slowly, cannot achieve quick drying, and is prone to bubbling and cracking. Therefore, there is an urgent need to develop a fast-drying water-based damping coating with good performance. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a quick-drying water-based damping coating composition and a preparation method thereof.

[0005] The technical solution of the present invention is as follows:

[0006] One of the purposes of the present invention is to provide a quick-drying water-based damping coating composition, which is composed of the following raw materials in parts by weight: 40-60 parts of hydroxyl acrylic dispersion, 5-10 parts of hydroxyl acrylic latex, 5-10 parts of damping latex, 5-10 parts of pigment, 20-30 parts of water, 5-10 parts of TiO2 nanocomposite hydrogel, 10-15 parts of filler, 0.05-0.1 parts of defoaming agent, 0.2-0.5 parts of dispersant, and 0.2-0.5 parts of bactericide.

[0007] Furthermore, the preparation process of the hydroxylated acrylic acid dispersion is as follows:

[0008] S11: mixing a double-bond-containing olefin monomer and an acrylate monomer to perform free radical polymerization to obtain a prepolymer A;

[0009] S12: mixing an acrylate monomer with acrylic acid to perform addition polymerization to obtain a prepolymer B;

[0010] S13: prepolymer A and prepolymer B are mixed, sodium hydroxide is added to neutralize the carboxylic acid group into salt, water is added and stirred at a rotation speed of 500-600 r / min for 30-40 min to obtain the hydroxylated acrylic acid dispersion.

[0011] Furthermore, the damping latex is a core-shell latex, which is composed of the following raw materials in parts by weight: 12 parts of core emulsion, 30 parts of shell emulsion, 0.2 parts of OP-10, 0.3 parts of sodium dodecylbenzene sulfonate, 0.2 parts of sodium bicarbonate, 0.3 parts of ammonium persulfate, and 50 parts of water; silane coupling agent KH-570 is used in the core emulsion to modify it, and the proportion of silane coupling agent KH-570 in the core emulsion is 0.08%.

[0012] Furthermore, the preparation process of the core-shell latex is:

[0013] S21: OP-10, sodium dodecylbenzene sulfonate, water, sodium bicarbonate and ammonium persulfate are uniformly mixed, placed in an environment of 80°C, and the nuclear emulsion is added dropwise while stirring, and the dropping time is controlled within 1-2 hours to obtain a nuclear emulsion;

[0014] S22: adding the shell monomer pre-emulsion and ammonium persulfate dropwise to the core emulsion obtained in step S21 while stirring, and reacting for 3 hours to obtain the core-shell latex.

[0015] Furthermore, the pigment is one or a mixture of phthalocyanine blue powder, phthalocyanine green powder, iron yellow powder and titanium dioxide.

[0016] Furthermore, the filler is one or a mixture of kaolin, silica powder, talcum powder and mica powder.

[0017] Furthermore, the defoamer is a water-based silicone defoamer.

[0018] Furthermore, the dispersant is anionic polyacrylic acid sodium salt.

[0019] Furthermore, the fungicide is chloromethylisothiazolinone.

[0020] The second object of the present invention is to provide a method for preparing a quick-drying water-based damping coating composition, which specifically comprises the following steps:

[0021] S31: adding hydroxylated acrylic dispersion, hydroxylated acrylic latex, damping latex and water into a mixer according to a set ratio, and stirring at a speed of 500-600 r / min for 1-2 h;

[0022] S32: adding defoamer, dispersant and bactericide, stirring at a speed of 600-800 r / min for 0.5 h;

[0023] S33: adding pigment, TiO2 nanocomposite hydrogel and filler, stirring at a speed of 1000-1500 r / min for 1-1.5 hours to obtain the quick-drying water-based damping coating composition.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. The present invention provides a quick-drying water-based damping coating composition, which uses a hydroxyl acrylic latex with strong hydrophilicity, low viscosity and stain resistance. During the film-forming process, water escapes outward through the pores of the TiO2 nanocomposite hydrogel and is transferred to the coating surface through the hydrophilic groups of the hydroxyl acrylic latex. The hydroxyl acrylic latex and the TiO2 nanocomposite hydrogel act synergistically, greatly shortening the drying time of the coating, and reducing the occurrence of problems of easy staining and dust accumulation of the coating during the drying process of the coating, thereby greatly improving the smoothness of the coating surface.

[0026] 2. In the present invention, the damping latex is a core-shell latex, and the core emulsion is modified by using a silane coupling agent KH-570. The use of a coupling agent to modify the core emulsion can improve the damping properties of the damping latex without affecting other properties of the coating. The damping latex prepared by the present invention will not crack or bubbling even when baked at high temperature. DETAILED DESCRIPTION

[0027] The present invention is further described below in conjunction with preferred embodiments. The endpoints and any values ​​of the ranges disclosed in the present invention are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values; for numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, and these numerical ranges should be regarded as specifically disclosed herein; the materials, reagents, etc. used in the following embodiments, unless otherwise specified, can be obtained from commercial channels; the experimental methods in the following embodiments, unless otherwise specified, are all conventional methods.

[0028] Example 1

[0029] This embodiment provides a quick-drying water-based damping coating composition, which is composed of the following raw materials in parts by weight:

[0030] Table 1 Raw material composition of quick-drying water-based damping coating composition

[0031]

[0032]

[0033] In this embodiment, the preparation process of the hydroxylated acrylic acid dispersion is as follows:

[0034] S11: mixing styrene and methyl methacrylate to perform free radical polymerization to obtain a prepolymer A;

[0035] S12: mixing methyl methacrylate and acrylic acid to perform addition polymerization to obtain prepolymer B;

[0036] S13: prepolymer A and prepolymer B are mixed, sodium hydroxide is added to neutralize the carboxylic acid group into salt, water is added and stirred at a rotation speed of 550 r / min for 35 minutes to obtain the hydroxylated acrylic acid dispersion.

[0037] In this embodiment, the damping latex is a core-shell latex, which is composed of the following raw materials in parts by weight: 12 parts of core emulsion, 30 parts of shell emulsion, 0.2 parts of OP-10, 0.3 parts of sodium dodecylbenzene sulfonate, 0.2 parts of sodium bicarbonate, 0.3 parts of ammonium persulfate, and 50 parts of water; silane coupling agent KH-570 is used in the core emulsion to modify it, and the proportion of silane coupling agent KH-570 in the core emulsion is 0.08%.

[0038] Furthermore, the preparation process of the core-shell latex is:

[0039] S21: OP-10, sodium dodecylbenzene sulfonate, water, sodium bicarbonate and ammonium persulfate are mixed evenly, placed in an environment of 80°C, and the nuclear emulsion is added dropwise while stirring, and the dropping time is controlled within 1.5 hours to obtain a nuclear emulsion;

[0040] S22: adding the shell monomer pre-emulsion and ammonium persulfate dropwise to the core emulsion obtained in step S21 while stirring, and reacting for 3 hours to obtain the core-shell latex.

[0041] In this embodiment, the defoamer is BYK-024 produced by BYK Chemicals.

[0042] This embodiment also provides a method for preparing a quick-drying water-based damping coating composition, which specifically comprises the following steps:

[0043] S31: adding hydroxylated acrylic dispersion, hydroxylated acrylic latex, damping latex and water into a mixer according to a set ratio, and stirring at a speed of 550 r / min for 1.5 h;

[0044] S32: adding defoamer, dispersant and bactericide, stirring at a speed of 700 r / min for 0.5 h;

[0045] S33: adding pigment, TiO2 nanocomposite hydrogel and filler, stirring at a speed of 1200 r / min for 1.2 h to obtain the quick-drying water-based damping coating composition.

[0046] Example 2

[0047] This embodiment provides a quick-drying water-based damping coating composition, which is composed of the following raw materials in parts by weight:

[0048] Table 2 Raw material composition of quick-drying water-based damping coating composition

[0049] Hydroxylated acrylic dispersion 40 servings Hydroxylated acrylic latex 5 servings Damping latex 5 servings Iron yellow powder, titanium dioxide 5 servings water 20 servings <![CDATA[TiO2 nanocomposite hydrogel]]> 5 servings Kaolin 10 servings Defoaming agent 0.05 Anionic polyacrylic acid sodium salt 0.2 parts Chloromethylisothiazolinone 0.2 parts

[0050] In this embodiment, the preparation process of the hydroxylated acrylic acid dispersion is as follows:

[0051] S11: mixing ethyl acrylate and butyl acrylate to perform free radical polymerization to obtain a prepolymer A;

[0052] S12: mixing butyl acrylate and acrylic acid to perform addition polymerization to obtain prepolymer B;

[0053] S13: prepolymer A and prepolymer B are mixed, sodium hydroxide is added to neutralize the carboxylic acid group into salt, water is added and stirred at a speed of 500 r / min for 30 minutes to obtain the hydroxylated acrylic acid dispersion.

[0054] In this embodiment, the damping latex is a core-shell latex, which is composed of the following raw materials in parts by weight: 12 parts of core emulsion, 30 parts of shell emulsion, 0.2 parts of OP-10, 0.3 parts of sodium dodecylbenzene sulfonate, 0.2 parts of sodium bicarbonate, 0.3 parts of ammonium persulfate, and 50 parts of water; silane coupling agent KH-570 is used in the core emulsion to modify it, and the proportion of silane coupling agent KH-570 in the core emulsion is 0.08%.

[0055] Furthermore, the preparation process of the core-shell latex is:

[0056] S21: OP-10, sodium dodecylbenzene sulfonate, water, sodium bicarbonate and ammonium persulfate are uniformly mixed, placed in an environment of 80°C, and the nuclear emulsion is added dropwise while stirring, and the dropping time is controlled within 1 hour to obtain a nuclear emulsion;

[0057] S22: adding the shell monomer pre-emulsion and ammonium persulfate dropwise to the core emulsion obtained in step S21 while stirring, and reacting for 3 hours to obtain the core-shell latex.

[0058] This embodiment also provides a method for preparing a quick-drying water-based damping coating composition, which specifically comprises the following steps:

[0059] S31: adding hydroxylated acrylic dispersion, hydroxylated acrylic latex, damping latex and water into a mixer according to a set ratio, and stirring at a speed of 500 r / min for 2 h;

[0060] S32: adding defoamer, dispersant and bactericide, stirring at a speed of 600 r / min for 0.5 h;

[0061] S33: adding pigment, TiO2 nanocomposite hydrogel and filler, stirring at a speed of 1000 r / min for 1.5 h to obtain the quick-drying water-based damping coating composition.

[0062] Example 3

[0063] This embodiment provides a quick-drying water-based damping coating composition, which is composed of the following raw materials in parts by weight:

[0064] Table 3 Raw material composition of quick-drying water-based damping coating composition

[0065]

[0066]

[0067] In this embodiment, the preparation process of the hydroxylated acrylic acid dispersion is as follows:

[0068] S11: mixing butyl acrylate and 2-hydroxyethyl acrylate to perform free radical polymerization to obtain a prepolymer A;

[0069] S12: mixing 2-hydroxyethyl acrylate and acrylic acid to perform addition polymerization to obtain prepolymer B;

[0070] S13: prepolymer A and prepolymer B are mixed, sodium hydroxide is added to neutralize the carboxylic acid group into salt, water is added and stirred at a speed of 600 r / min for 40 minutes to obtain the hydroxylated acrylic acid dispersion.

[0071] In this embodiment, the damping latex is a core-shell latex, which is composed of the following raw materials in parts by weight: 12 parts of core emulsion, 30 parts of shell emulsion, 0.2 parts of OP-10, 0.3 parts of sodium dodecylbenzene sulfonate, 0.2 parts of sodium bicarbonate, 0.3 parts of ammonium persulfate, and 50 parts of water; silane coupling agent KH-570 is used in the core emulsion to modify it, and the proportion of silane coupling agent KH-570 in the core emulsion is 0.08%.

[0072] Furthermore, the preparation process of the core-shell latex is:

[0073] S21: OP-10, sodium dodecylbenzene sulfonate, water, sodium bicarbonate and ammonium persulfate are mixed evenly, placed in an environment of 80°C, and the nuclear emulsion is added dropwise while stirring for 2 hours to obtain a nuclear emulsion;

[0074] S22: adding the shell monomer pre-emulsion and ammonium persulfate dropwise to the core emulsion obtained in step S21 while stirring, and reacting for 3 hours to obtain the core-shell latex.

[0075] This embodiment also provides a method for preparing a quick-drying water-based damping coating composition, which specifically comprises the following steps:

[0076] S31: adding hydroxyl acrylic dispersion, hydroxyl acrylic latex, damping latex and water into a mixer according to a set ratio, and stirring at a speed of 600 r / min for 1 h;

[0077] S32: adding defoamer, dispersant and bactericide, stirring at a speed of 800 r / min for 0.5 h;

[0078] S33: adding pigment, TiO2 nanocomposite hydrogel and filler, stirring at a speed of 1500 r / min for 1 hour to obtain the quick-drying water-based damping coating composition.

[0079] Example 4

[0080] This embodiment provides a quick-drying water-based damping coating composition, which is composed of the following raw materials in parts by weight:

[0081] Table 4 Raw material composition of quick-drying water-based damping coating composition

[0082] Hydroxylated acrylic dispersion 50 servings Hydroxylated acrylic latex 8 servings Damping latex 8 servings Phosphate blue powder 7 servings water 25 servings <![CDATA[TiO2 nanocomposite hydrogel]]> 7 servings talcum powder 12 servings Defoaming agent 0.07 Anionic polyacrylic acid sodium salt 0.3 parts Chloromethylisothiazolinone 0.3 parts

[0083] In this embodiment, the preparation process of the hydroxylated acrylic acid dispersion is as follows:

[0084] S11: mixing ethyl acrylate and 2-hydroxyethyl acrylate to perform free radical polymerization to obtain a prepolymer A;

[0085] S12: mixing 2-hydroxyethyl acrylate and acrylic acid to perform addition polymerization to obtain prepolymer B;

[0086] S13: prepolymer A and prepolymer B are mixed, sodium hydroxide is added to neutralize the carboxylic acid group into salt, water is added and stirred at a rotation speed of 550 r / min for 35 minutes to obtain the hydroxylated acrylic acid dispersion.

[0087] In this embodiment, the damping latex is a core-shell latex, which is composed of the following raw materials in parts by weight: 12 parts of core emulsion, 30 parts of shell emulsion, 0.2 parts of OP-10, 0.3 parts of sodium dodecylbenzene sulfonate, 0.2 parts of sodium bicarbonate, 0.3 parts of ammonium persulfate, and 50 parts of water; silane coupling agent KH-570 is used in the core emulsion to modify it, and the proportion of silane coupling agent KH-570 in the core emulsion is 0.08%.

[0088] Furthermore, the preparation process of the core-shell latex is:

[0089] S21: OP-10, sodium dodecylbenzene sulfonate, water, sodium bicarbonate and ammonium persulfate are mixed evenly, placed in an environment of 80°C, and the nuclear emulsion is added dropwise while stirring, and the dropping time is controlled within 1.5 hours to obtain a nuclear emulsion;

[0090] S22: adding the shell monomer pre-emulsion and ammonium persulfate dropwise to the core emulsion obtained in step S21 while stirring, and reacting for 3 hours to obtain the core-shell latex.

[0091] This embodiment also provides a method for preparing a quick-drying water-based damping coating composition, which specifically comprises the following steps:

[0092] S31: adding hydroxylated acrylic dispersion, hydroxylated acrylic latex, damping latex and water into a mixer according to a set ratio, and stirring at a speed of 550 r / min for 1.5 h;

[0093] S32: adding defoamer, dispersant and bactericide, stirring at a speed of 700 r / min for 0.5 h;

[0094] S33: adding pigment, TiO2 nanocomposite hydrogel and filler, stirring at a speed of 1200 r / min for 1.2 h to obtain the quick-drying water-based damping coating composition.

[0095] In the present invention, the pigment can also be selected from one or a mixture of phthalocyanine blue powder, phthalocyanine green powder, iron yellow powder and titanium dioxide; the filler can also be selected from one or a mixture of kaolin, silica powder, talc powder and mica powder.

[0096] Example 5

[0097] It is basically the same as Example 1, except that in the damping latex of this example, the core emulsion is not modified by the silane coupling agent KH-570.

[0098] Comparative Example 1

[0099] The difference from Example 1 is that this comparative example does not contain hydroxylated acrylic latex, and the coating composition of this comparative example is composed of the following raw materials in parts by weight:

[0100] Table 5 Raw material composition of coating composition

[0101] Hydroxylated acrylic dispersion 58 servings Damping latex 8 servings Phosphate blue powder 7 servings water 25 servings <![CDATA[TiO2 nanocomposite hydrogel]]> 7 servings Silica powder, mica powder 12 servings Defoaming agent 0.07 Anionic polyacrylic acid sodium salt 0.3 parts Chloromethylisothiazolinone 0.3 parts

[0102] Comparative Example 2

[0103] The difference from Example 1 is that this comparative example does not contain damping latex, and the coating composition of this comparative example is composed of the following raw materials in parts by weight:

[0104] Table 6 Raw material composition of coating composition

[0105]

[0106]

[0107] Comparative Example 3

[0108] The difference from Example 1 is that this comparative example does not contain TiO2 nanocomposite hydrogel, and the coating composition of this comparative example is composed of the following raw materials in parts by weight:

[0109] Table 7 Raw material composition of coating composition

[0110] Hydroxylated acrylic dispersion 50 servings Hydroxylated acrylic latex 8 servings Damping latex 8 servings Phosphate blue powder 7 servings water 25 servings Silica powder, mica powder 19 servings Defoaming agent 0.07 Anionic polyacrylic acid sodium salt 0.3 parts Chloromethylisothiazolinone 0.3 parts

[0111] Comparative Example 4

[0112] The difference from Example 1 is that this comparative example does not contain hydroxylated acrylic latex and damping latex, and the coating composition of this comparative example is composed of the following raw materials in parts by weight:

[0113] Table 8 Raw material composition of coating composition

[0114] Hydroxylated acrylic dispersion 66 copies Phosphate blue powder 7 servings water 25 servings <![CDATA[TiO2 nanocomposite hydrogel]]> 7 servings Silica powder, mica powder 12 servings Defoaming agent 0.07 Anionic polyacrylic acid sodium salt 0.3 parts Chloromethylisothiazolinone 0.3 parts

[0115] Implementation effect evaluation

[0116] The coating compositions prepared in Examples 1-5 and Comparative Examples 1-4 were sprayed onto a substrate with a coating thickness of 2 mm. After leveling for 10 minutes, the coating was baked at 80° C. for 1 hour to prepare a sample plate.

[0117] The excellent effects achieved by the present invention are further illustrated by conducting specific tests on the coating compositions prepared in Examples 1-5 and Comparative Examples 1-4 and the coating samples prepared therefrom. The test results are shown in the following table:

[0118] Table 9 Test results statistics

[0119]

[0120]

[0121] It can be seen from the above table that the quick-drying water-based damping coating composition of the present invention has a short drying time for the coating and good surface flatness.

[0122] The above is only a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several modifications and improvements without departing from the inventive concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A quick-drying water-based damping coating composition, characterized in that: The invention is composed of the following raw materials in parts by weight: 40-60 parts of hydroxy acrylic dispersion, 5-10 parts of hydroxy acrylic latex, 5-10 parts of damping latex, 5-10 parts of pigment, 20-30 parts of water, 5-10 parts of TiO2 nanocomposite hydrogel, 10-15 parts of filler, 0.05-0.1 parts of defoamer, 0.2-0.5 parts of dispersant and 0.2-0.5 parts of bactericide.

2. A quick-drying water-based damping coating composition according to claim 1, characterized in that: The preparation process of the hydroxylated acrylic acid dispersion is as follows: S11: mixing a double-bond-containing olefin monomer and an acrylate monomer to perform free radical polymerization to obtain a prepolymer A; S12: mixing an acrylate monomer with acrylic acid to perform addition polymerization to obtain a prepolymer B; S13: prepolymer A and prepolymer B are mixed, sodium hydroxide is added to neutralize the carboxylic acid group into salt, water is added and stirred at a rotation speed of 500-600 r / min for 30-40 min to obtain the hydroxylated acrylic acid dispersion.

3. A quick-drying water-based damping coating composition according to claim 1, characterized in that: The damping latex is a core-shell latex, which is composed of the following raw materials in parts by weight: 12 parts of core emulsion, 30 parts of shell emulsion, 0.2 parts of OP-10, 0.3 parts of sodium dodecylbenzene sulfonate, 0.2 parts of sodium bicarbonate, 0.3 parts of ammonium persulfate, and 50 parts of water; silane coupling agent KH-570 is used in the core emulsion to modify it, and the proportion of silane coupling agent KH-570 in the core emulsion is 0.08%.

4. A quick-drying water-based damping coating composition according to claim 3, characterized in that: The preparation process of the core-shell latex is: S21: OP-10, sodium dodecylbenzene sulfonate, water, sodium bicarbonate and ammonium persulfate are uniformly mixed, placed in an environment of 80°C, and the nuclear emulsion is added dropwise while stirring, and the dropping time is controlled within 1-2 hours to obtain a nuclear emulsion; S22: adding the shell monomer pre-emulsion and ammonium persulfate dropwise to the core emulsion obtained in step S21 while stirring, and reacting for 3 hours to obtain the core-shell latex.

5. A quick-drying water-based damping coating composition according to claim 1, characterized in that: The pigment is one of phthalocyanine blue powder, phthalocyanine green powder, iron yellow powder and titanium dioxide, or a mixture of several of them.

6. A quick-drying water-based damping coating composition according to claim 1, characterized in that: The filler is one or a mixture of kaolin, silica powder, talcum powder and mica powder.

7. A quick-drying water-based damping coating composition according to claim 1, characterized in that: The defoamer is a water-based silicone defoamer.

8. The quick-drying water-based damping coating composition according to claim 1, characterized in that: The dispersant is anionic polyacrylic acid sodium salt.

9. The quick-drying water-based damping coating composition according to claim 1, characterized in that: The bactericide is chloromethylisothiazolinone.

10. A method for preparing a quick-drying water-based damping coating composition according to any one of claims 1 to 9, characterized in that: The specific steps include: S31: adding hydroxylated acrylic dispersion, hydroxylated acrylic latex, damping latex and water into a mixer according to a set ratio, and stirring at a speed of 500-600 r / min for 1-2 h; S32: adding defoamer, dispersant and bactericide, stirring at a speed of 600-800 r / min for 0.5 h; S33: adding pigment, TiO2 nanocomposite hydrogel and filler, stirring at a speed of 1000-1500 r / min for 1-1.5 hours to obtain the quick-drying water-based damping coating composition.

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