Sound-insulation water-based paint for building floor slab and preparation method of sound-insulation water-based paint

Abstract

The invention relates to a sound-insulation water-based paint for building floor slabs and a preparation method thereof, and belongs to the technical field of water-based paints. The preparation raw materials of the sound insulation water-based paint comprise water-based epoxy resin, a water-based curing agent, a sound insulation filler A, a sound insulation filler B and an auxiliary agent, wherein the auxiliary agent is at least one of a coalescing agent, a defoaming agent, a flatting agent and an anti-aging agent; the ionic liquid, the dipropylene glycol diacrylate and the ethyl acrylate are crosslinked into a polymer layer through free radical polymerization reaction, and the surface of the hollow glass bead is coated with the polymer layer, so that the sound insulation filler A is prepared; the preparation method comprises the following steps: carrying out SN2 nucleophilic substitution reaction on N-vinyl imidazole and 2-bromoethanol, and carrying out reaction on a product and 4-ethyl phenyl isocyanate, so as to prepare the ionic liquid; and modifying the nano clay by using an epoxy silane coupling agent to prepare a sound insulation filler B. The sound insulation water-based paint solves the problem of uneven dispersion of the hollow glass beads, and the impact sound pressure level improvement amount can reach 17.9 dB through weighting of a synergistic effect.

Description

Technical Field

[0001] This invention belongs to the field of water-based coating technology, specifically relating to a sound-insulating water-based coating for building floor slabs and its preparation method. Background Technology

[0002] With the continuous development of building sound insulation technology, the sound insulation performance of building floors has become one of the key factors affecting the acoustic environment quality of residential and public buildings. For the problem of impact noise and structural sound transmission in building floors, sound insulation treatment using membrane coatings has gained attention due to its flexible construction and minimal impact on the original structure. Among these, water-based sound-insulating coatings particularly align with the current trend of building materials moving towards environmental protection and low emissions. Currently, most water-based sound-insulating coatings improve sound insulation performance by adding lightweight porous fillers to the film-forming material. Hollow glass microspheres, with their low density and stable internal cavity structure, are widely used as the primary sound-insulating filler.

[0003] However, in practical applications, it has been found that the interfacial compatibility between hollow glass microspheres and the film-forming substance, i.e., the resin material, is insufficient. Their surfaces are difficult to wet sufficiently, and a stable, uniform dispersion cannot be formed in the coating system, easily leading to localized aggregation during preparation, application, and curing. This uneven dispersion problem disrupts the continuity and uniformity of the final coating's internal structure, causing an imbalance in the spatial distribution of hollow glass microspheres within the film, thus significantly reducing the sound insulation effect. Moreover, the sound insulation performance of existing hollow glass microspheres in coatings is already limited, and the aforementioned dispersion problem further amplifies this deficiency. Summary of the Invention

[0004] The purpose of this invention is to provide a sound-insulating water-based coating for building floor slabs, which, after curing into a coating, has high sound insulation and noise reduction effects; at the same time, this invention also provides a method for its preparation.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: Technical Solution 1: A sound-insulating water-based coating for building floor slabs, wherein the raw materials for preparing the sound-insulating water-based coating include water-based epoxy resin, water-based curing agent, sound-insulating filler A, and sound-insulating filler B.

[0006] In some preferred embodiments, the weight ratio of the waterborne epoxy resin, the waterborne curing agent, the sound-insulating filler A, and the sound-insulating filler B is 5.5-7.8:1.3-1.6:0.15-0.18:0.06-0.1.

[0007] In some preferred embodiments, the raw materials for preparing the sound-insulating waterborne coating also include additives.

[0008] Preferably, the additive is at least one selected from film-forming aids, defoamers, leveling agents, and antioxidants.

[0009] In some preferred embodiments, the method for preparing the sound-insulating filler A includes the following steps: Step S1: Take tetrahydrofuran, N-vinylimidazolium and 2-bromoethanol, place them in a reaction vessel under a nitrogen atmosphere, start stirring and protect from light, raise the temperature, keep the temperature constant for reaction A, lower the temperature, add 4-ethylphenyl isocyanate, keep the temperature constant for reaction B, add a poor solvent, filter and separate, wash the solid phase and dry to obtain an ionic liquid. The nitrogen atom of the imidazole ring in N-vinylimidazolium first reacts with 2-bromoethanol to form an S-reacting reaction. N 2. Nucleophilic substitution reaction yields alcohol hydroxyl unsaturated ILs. After adding 4-ethylphenyl isocyanate, the alcohol hydroxyl group will attack the isocyanate, directly yielding benzene ring unsaturated ILs, which is the ionic liquid of this invention. Step S2: Take ionic liquid, dipropylene glycol diacrylate, ethyl acrylate, hollow glass microspheres and aviation kerosene, place them in a reaction vessel under nitrogen atmosphere, start stirring and protect from light, heat up, mix at constant temperature, add azobisisobutyronitrile A, react at constant temperature C, then add azobisisobutyronitrile B, react at constant temperature D, filter to separate, wash the solid phase and dry. Hollow glass microspheres have a closed air cavity inside and a rigid glass shell on the outside, which can play a sound insulation role through sound energy reflection, absorption and attenuation. Dipropylene glycol diacrylate is a bifunctional compound that can cross-link with ionic liquid and ethyl acrylate through free radical polymerization to form a polymer layer that coats the surface of hollow glass microspheres. This polymer layer improves the interfacial compatibility between hollow glass microspheres and resin materials, reduces the possibility of sedimentation and agglomeration, and stabilizes the dispersion state. Ionic liquids participate in the formation of polymer layers. Their special structure, in addition to chemical cross-linking polymerization, often has weak interactions such as ionic clusters and Coulomb electrostatic attraction. These weak interactions can convert sound energy into other forms of energy such as heat energy, and become a buffer unit for sound energy loss, reducing structural sound transmission. The benzene rings on the ionic liquid make it easier for molecular-level relative displacement and orientation rearrangement to occur at the interface between the polymer layer and resin materials, continuously converting sound vibration energy into intramolecular friction and interfacial friction, resulting in loss.

[0010] Preferably, in step S1, the ratio of the amount of tetrahydrofuran, the N-vinylimidazole, and the undesirable solvent is 88-110 mL: 7-13 mL: 680-810 mL.

[0011] Preferably, in step S1, the heating refers to heating to 65-71°C.

[0012] Preferably, in step S1, the isothermal reaction A refers to an isothermal reaction under reflux for 20-28 hours.

[0013] Preferably, in step S1, the cooling refers to cooling to 25-34°C.

[0014] Preferably, in step S1, the isothermal reaction B refers to an isothermal reaction under reflux for 9-10 hours.

[0015] Preferably, in step S1, the undesirable solvent is ethyl acetate or cyclohexanone.

[0016] Preferably, in step S2, the ratio of the ionic liquid, the dipropylene glycol diacrylate, the ethyl acrylate, the hollow glass microspheres, the aviation kerosene, the azobisisobutyronitrile A, and the azobisisobutyronitrile B is 3.8-4.4g:1.5-1.8g:4-4.6g:12-14g:230-242mL:0.05-0.1g:0.05-0.1g.

[0017] Preferably, in step S2, the heating refers to heating to 95-100°C.

[0018] Preferably, in step S2, the isothermal mixing refers to isothermal mixing under reflux for 20-60 minutes.

[0019] Preferably, in step S2, the isothermal reaction C refers to an isothermal reaction under reflux for 20-40 minutes.

[0020] Preferably, in step S2, the isothermal reaction D refers to an isothermal reaction under reflux for 2-4 hours.

[0021] In some preferred embodiments, the method for preparing the sound-insulating filler B includes the following steps: Toluene and nano-clay were placed in a reaction vessel under a nitrogen atmosphere. Stirring was started, ultrasonic dispersion was performed, epoxy silane coupling agent was added, the temperature was raised, and the reaction was kept at a constant temperature for E. After centrifugation, the solid phase was collected, washed, and dried. Nanoclay is a layered mineral silicate. These layered fillers exist in the coating in a peeling, intercalation, or semi-orientation manner, which significantly lengthens the propagation path of sound waves and causes multiple reflections and scattering, reducing the effective transmission of sound waves. Epoxy silane coupling agents are reactive to inorganic substances, and organic epoxy functional groups are sensitive to water-based curing agents, which can improve the adhesion between nanoclay and resin materials and form stable chemical bonds.

[0022] Preferably, the ratio of the toluene, the nano-clay, and the epoxy silane coupling agent is 82-105 mL: 1-2.7 g: 2.4-4 mL.

[0023] Preferably, the epoxy silane coupling agent is at least one selected from 3-glycidyl etheroxypropyltrimethoxysilane and 3-glycidyl etheroxypropyltriethoxysilane.

[0024] Preferably, the temperature increase refers to raising the temperature to 90-110℃.

[0025] Preferably, the isothermal reaction E refers to an isothermal reaction under reflux for 12-24 hours.

[0026] Technical Solution 2: A method for preparing a sound-insulating water-based coating for building floor slabs, comprising the following steps: Waterborne epoxy resin, sound insulation filler A and sound insulation filler B are placed in a reaction vessel, stirred and dispersed, additives are added, stirred and mixed, and finally waterborne curing agent is added and homogenized.

[0027] The following describes the beneficial effects achieved by this invention: 1. The technical solution of the present invention solves the problem of uneven dispersion of hollow glass microspheres. The dispersion of hollow glass microspheres / sound insulation filler A in sound insulation water-based coatings is significantly improved, effectively solving defects such as agglomeration and sedimentation, and improving the sound insulation performance of the coating.

[0028] 2. The technical solution of the present invention adds sound-insulating filler B. Through the synergistic effect of sound-insulating filler A and sound-insulating filler B, the weighted impact sound pressure level improvement of the sound-insulating water-based coating is enhanced, and the effect is better than when sound-insulating filler A is used alone. Detailed Implementation

[0029] To further illustrate the technical means and effects of the present invention, the following describes the technical solution of the present invention in conjunction with preferred embodiments of the present invention. However, the present invention is not limited to the scope of the embodiments.

[0030] Some of the materials used in the embodiments are described in Table 1: Table 1. Manufacturers or components of materials The technical solution of the present invention involves many heating or cooling processes, and the appropriate temperature change rate has little effect on the result and does not need to be strictly limited; for convenience, the following embodiments all use a temperature change rate of 4℃ / min to control the heating and cooling processes.

[0031] Example 1 This embodiment provides a sound-insulating water-based coating for building floor slabs and its preparation method.

[0032] A sound-insulating water-based coating for building floor slabs is prepared by means of water-based epoxy resin, water-based curing agent, sound-insulating filler A, and sound-insulating filler B in a weight ratio of 7:1.5:0.15:0.1; and additives, the amount of which is 2% of the weight of the water-based epoxy resin. The additives include film-forming aid, defoamer, leveling agent, and anti-aging agent in a weight ratio of 1:0.5:0.3:0.3. The curing conditions for the sound-insulating water-based coating are: temperature 25℃, relative humidity 55%, and time 7 days.

[0033] A method for preparing a sound-insulating water-based coating for building floor slabs includes the following steps: Place waterborne epoxy resin, sound insulation filler A and sound insulation filler B in a reaction vessel, stir and disperse at 200 r / min for 10 min, add the additives, stir and mix at 200 r / min for 10 min, and finally add the waterborne curing agent and homogenize at 400 r / min for 2 min.

[0034] The preparation method of sound insulation filler A includes the following steps: Step S1: Take 100 mL of tetrahydrofuran, 10 mL of N-vinylimidazolium and 2-bromoethanol, place them in a reaction vessel under a nitrogen atmosphere, start stirring at 200 r / min and protect from light, heat to 65 °C, and react under reflux for 22 h. Cool down to 30 °C, add 4-ethylphenyl isocyanate, the amount of 2-bromoethanol and 4-ethylphenyl isocyanate is the same as the amount of N-vinylimidazolium, react under reflux for 10 h, add 700 mL of ethyl acetate, filter and separate, wash the solid phase with ethyl acetate and dry in an oven at 70 °C until no volatiles remain, to obtain an ionic liquid; Step S2: Take 4.3g of ionic liquid, 1.6g of dipropylene glycol diacrylate, 4.2g of ethyl acrylate, 12g of hollow glass microspheres and 240mL of aviation kerosene, place them in a reaction vessel under a nitrogen atmosphere, start stirring at 200r / min and protect from light, heat to 100℃, mix under reflux for 40min, add 0.05g of azobisisobutyronitrile, react under reflux for 30min, add another 0.1g of azobisisobutyronitrile, react under reflux for 4h, filter and separate, wash the solid phase with ethanol and dry in an oven at 90℃ until no volatiles remain.

[0035] The preparation method of sound insulation filler B includes the following steps: Take 105 mL of toluene and 1.5 g of nano clay and place them in a reaction vessel under a nitrogen atmosphere. Start stirring at 400 r / min and sonicate at 20 kHz for 30 min. Add 3 mL of 3-glycidyl etheroxypropyltrimethoxysilane, heat to 95 °C, and react under reflux for 12 h. Centrifuge at 10000 r / min for 5 min, collect the solid phase, wash with ethyl acetate, and dry in an oven at 80 °C until no volatiles remain.

[0036] Example 2 This embodiment provides a sound-insulating water-based coating for building floor slabs and its preparation method.

[0037] A sound-insulating water-based coating for building floor slabs is prepared by means of water-based epoxy resin, water-based curing agent, sound-insulating filler A, and sound-insulating filler B in a weight ratio of 7.5:1.6:0.18:0.1; and additives, the amount of which is 2% of the weight of the water-based epoxy resin. The additives include film-forming aid, defoamer, leveling agent, and antioxidant in a weight ratio of 1.5:0.5:0.2:1. The curing conditions for the sound-insulating water-based coating are: temperature 25℃, relative humidity 55%, and time 7 days.

[0038] A method for preparing a sound-insulating water-based coating for building floor slabs includes the following steps: Place waterborne epoxy resin, sound insulation filler A and sound insulation filler B in a reaction vessel, stir and disperse at 200 r / min for 5 min, add the additives, stir and mix at 200 r / min for 5 min, and finally add the waterborne curing agent and homogenize at 300 r / min for 5 min.

[0039] The preparation method of sound insulation filler A includes the following steps: Step S1: Take 88 mL of tetrahydrofuran, 8 mL of N-vinylimidazolium and 2-bromoethanol, place them in a reaction vessel under a nitrogen atmosphere, start stirring at 200 r / min and protect from light, heat to 71 °C, and react under reflux for 24 h. Cool down to 32 °C, add 4-ethylphenyl isocyanate, the amount of 2-bromoethanol and 4-ethylphenyl isocyanate is the same as the amount of N-vinylimidazolium, react under reflux for 10 h, add 700 mL of cyclohexanone, filter and separate, wash the solid phase with ethyl acetate and dry in an oven at 50 °C until no volatiles remain, to obtain an ionic liquid; Step S2: Take 3.8g of ionic liquid, 1.5g of dipropylene glycol diacrylate, 4g of ethyl acrylate, 12g of hollow glass microspheres and 235mL of aviation kerosene, place them in a reaction vessel under a nitrogen atmosphere, start stirring at 200r / min and protect from light, heat to 95℃, and mix under reflux for 60min. Add 0.1g of azobisisobutyronitrile, and react under reflux for 40min. Add another 0.1g of azobisisobutyronitrile, and react under reflux for 3h. Filter and separate, wash the solid phase with toluene and dry in an oven at 100℃ until no volatiles remain.

[0040] The preparation method of sound insulation filler B includes the following steps: Take 82 mL of toluene and 1 g of nano-clay, place them in a reaction vessel under a nitrogen atmosphere, start stirring at 400 r / min, sonicate at 60 kHz for 10 min, add 2.4 mL of 3-glycidyl etheroxypropyltriethoxysilane, heat to 110 °C, reflux and react at a constant temperature for 24 h, centrifuge at 15000 r / min for 5 min, collect the solid phase, wash with ether, and dry in an oven at 80 °C until no volatiles remain.

[0041] Example 3 This embodiment provides a sound-insulating water-based coating for building floor slabs and its preparation method.

[0042] A sound-insulating water-based coating for building floor slabs is prepared by means of water-based epoxy resin, water-based curing agent, sound-insulating filler A, and sound-insulating filler B in a weight ratio of 6:1.3:0.18:0.08; and additives, the amount of which is 2% of the weight of the water-based epoxy resin. The additives include film-forming aid, defoamer, leveling agent, and antioxidant in a weight ratio of 1:0.2:0.5:1. The curing conditions for the sound-insulating water-based coating are: temperature 25℃, relative humidity 55%, and time 7 days.

[0043] A method for preparing a sound-insulating water-based coating for building floor slabs includes the following steps: Place waterborne epoxy resin, sound insulation filler A and sound insulation filler B in a reaction vessel, stir and disperse at 200 r / min for 10 min, add the additives, stir and mix at 200 r / min for 10 min, and finally add the waterborne curing agent and homogenize at 500 r / min for 2 min.

[0044] The preparation method of sound insulation filler A includes the following steps: Step S1: Take 110 mL of tetrahydrofuran, 8 mL of N-vinylimidazole and 2-bromoethanol, place them in a reaction vessel under a nitrogen atmosphere, start stirring at 200 r / min and protect from light, heat to 68℃, reflux and react at a constant temperature for 20 h, cool to 34℃, add 4-ethylphenyl isocyanate, the amount of 2-bromoethanol and 4-ethylphenyl isocyanate is the same as the amount of N-vinylimidazole, reflux and react at a constant temperature for 9 h, add 810 mL of ethyl acetate, filter and separate, wash the solid phase with ethyl acetate and dry in an oven at 75℃ until no volatiles remain, to obtain an ionic liquid; Step S2: Take 4g of ionic liquid, 1.8g of dipropylene glycol diacrylate, 4g of ethyl acrylate, 14g of hollow glass microspheres and 242mL of aviation kerosene, place them in a reaction vessel under a nitrogen atmosphere, start stirring at 200r / min and protect from light, heat to 100℃, mix under reflux for 45min, add 0.1g of azobisisobutyronitrile, react under reflux for 40min, add another 0.1g of azobisisobutyronitrile, react under reflux for 4h, filter and separate, wash the solid phase with ethanol and dry in an oven at 90℃ until no volatiles remain.

[0045] The preparation method of sound insulation filler B includes the following steps: Take 82 mL of toluene and 1 g of nano-clay, place them in a reaction vessel under a nitrogen atmosphere, start stirring at 400 r / min, sonicate at 40 kHz for 15 min, add 3 mL of 3-glycidyl etheroxypropyltrimethoxysilane, heat to 106 °C, reflux and react at a constant temperature for 12 h, centrifuge at 10000 r / min for 15 min, collect the solid phase, wash with ethyl acetate, and dry in an oven at 80 °C until no volatiles remain.

[0046] Comparative Example 1 Comparative Example 1 is largely the same as Example 3, except that sound-insulating filler A is completely replaced by sound-insulating filler B by an equal weight. Nano-clay → Coupling agent modification.

[0047] Comparative Example 2 Comparative Example 2 is largely the same as Example 3, except that sound-insulating filler B is completely replaced by sound-insulating filler A by an equal weight. Hollow glass microspheres → polymer layer modification.

[0048] Comparative Example 3 Comparative Example 3 is largely the same as Example 3, except that the preparation method of sound-insulating filler A is the same as that of sound-insulating filler B. In other words, 1g of nano-clay is replaced with 1g of hollow glass microspheres to prepare sound-insulating filler A, while the preparation method of sound-insulating filler B remains unchanged. Hollow glass microspheres, nano-clay → coupling agent modification.

[0049] Comparative Example 4 Comparative Example 4 is largely the same as Example 3, except that the preparation method of sound-insulating filler B is the same as that of sound-insulating filler A. In other words, 14g of hollow glass microspheres is replaced with 14g of nano-clay to prepare sound-insulating filler B, while the preparation method of sound-insulating filler A remains unchanged. Hollow glass microspheres, nano-clay → polymer layer modification.

[0050] Comparative Example 5 Comparative Example 5 is largely the same as Example 3, except that 14g of hollow glass microspheres was replaced with 14g of nano-clay. Nano-clay → polymer layer modification, coupling agent modification.

[0051] Comparative Example 6 Comparative Example 6 is largely the same as Example 3, except that 1g of nano-clay was replaced with 1g of hollow glass microspheres. Hollow glass microspheres → polymer layer modification, coupling agent modification.

[0052] Comparative Example 7 Comparative Example 7 is largely the same as Example 3, except that 14g of hollow glass microspheres was replaced with 14g of nano-clay, and 1g of nano-clay was replaced with 1g of hollow glass microspheres. Hollow glass microspheres were modified with a coupling agent, and nano-clay was modified with a polymer layer.

[0053] Comparative Example 8 Comparative Example 8 is largely the same as Example 3, except that 4g of ionic liquid is replaced with 4g of ethyl acrylate. The process involves crosslinking and polymerization of dipropylene glycol diacrylate and ethyl acrylate.

[0054] Comparative Example 9 Comparative Example 9 is largely the same as Example 3, except that 4-ethylphenyl isocyanate is completely replaced by tetrahydrofuran at an equal weight. The cross-linking polymerization process involves a benzene ring-free ionic liquid followed by dipropylene glycol diacrylate and then ethyl acrylate.

[0055] Comparative Example 10 Comparative Example 10 is largely the same as Example 3, except that the sound-insulating filler A is completely replaced by hollow glass microspheres of equal weight. Hollow glass microspheres → no treatment, nano-clay → modified with coupling agent.

[0056] Performance testing: 1. Test subjects: Sound-insulating water-based coatings of Examples 1-3 and Comparative Examples 1-10; 2. Test method: The weighted impact sound pressure level improvement was tested according to the method described in the literature; 3. Reference: Zhang Hong. Preparation and performance study of water-based expandable microsphere sound insulation coating [J]. Coatings and Protection, 2025, 46(10): 1-5, 16. DOI: 10.3969 / j.issn.2096-8639.2025.10.001.

[0057] Table 2 Weighted improvement in impact sound pressure level As can be seen from Table 2, the sound-insulating water-based coating provided in the embodiments of the present invention has the best sound insulation effect and a high improvement in weighted impact sound pressure level, which was measured to be 17.9 dB in Example 3.

[0058] Comparing Example 3 with Comparative Examples 1-7 and Comparative Example 10, it can be seen that when the variable is the composition of the sound insulation filler or its corresponding modification method, there is a certain adverse effect, and the sound insulation effect deteriorates. Comparative Examples 1, 3, 5, 6 and 10 are even lower than 13dB.

[0059] A comparison of Example 3 and Comparative Examples 8-9 shows that when the variable is a cross-linked polymerized monomer (ionic liquid), the sound insulation effect is significantly deteriorated.

[0060] The applicant declares that this invention illustrates a sound-insulating water-based coating for building floor slabs and its preparation method through the above embodiments. However, this invention is not limited to the above embodiments, meaning that this invention does not necessarily rely on the above embodiments for implementation. Those skilled in the art should understand that any improvements to this invention, equivalent substitutions of raw materials, additions of auxiliary components, and selection of specific methods, etc., all fall within the protection and disclosure scope of this invention.

[0061] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0062] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

Claims

1. A sound-insulating water-based coating for building floor slabs, characterized in that, The raw materials for preparing the sound-insulating water-based coating include water-based epoxy resin, water-based curing agent, sound-insulating filler A, and sound-insulating filler B.

2. The sound-insulating water-based coating for building floor slabs according to claim 1, characterized in that, The weight ratio of the waterborne epoxy resin, the waterborne curing agent, the sound insulation filler A, and the sound insulation filler B is 5.5-7.8:1.3-1.6:0.15-0.18:0.06-0.

1.

3. The sound-insulating water-based coating for building floor slabs according to claim 1, characterized in that, The raw materials for preparing the sound-insulating water-based coating also include additives; the additives are at least one of film-forming aids, defoamers, leveling agents, and antioxidants.

4. The sound-insulating water-based coating for building floor slabs according to claim 1, characterized in that, The preparation method of the sound insulation filler A includes the following steps: Step S1: Take tetrahydrofuran, N-vinylimidazolium and 2-bromoethanol, place them in a reaction vessel under a nitrogen atmosphere, start stirring and protect from light, raise the temperature, keep the temperature constant for reaction A, lower the temperature, add 4-ethylphenyl isocyanate, keep the temperature constant for reaction B, add a poor solvent, filter and separate, wash the solid phase and dry to obtain an ionic liquid. Step S2: Take ionic liquid, dipropylene glycol diacrylate, ethyl acrylate, hollow glass microspheres and aviation kerosene, place them in a reaction vessel under nitrogen atmosphere, start stirring and protect from light, heat up, mix at a constant temperature, add azobisisobutyronitrile A, react at a constant temperature C, then add azobisisobutyronitrile B, react at a constant temperature D, filter to separate, wash the solid phase and dry.

5. The sound-insulating water-based coating for building floor slabs according to claim 4, characterized in that, In step S1, the ratio of the amount of tetrahydrofuran, the amount of N-vinylimidazole and the undesirable solvent is 88-110 mL: 7-13 mL: 680-810 mL.

6. The sound-insulating water-based coating for building floor slabs according to claim 4, characterized in that, In step S1, the heating refers to heating to 65-71℃; the cooling refers to cooling to 25-34℃; the isothermal reaction A refers to isothermal reaction under reflux for 20-28 hours; and the isothermal reaction B refers to isothermal reaction under reflux for 9-10 hours.

7. The sound-insulating water-based coating for building floor slabs according to claim 4, characterized in that, In step S2, the ratio of the ionic liquid, the dipropylene glycol diacrylate, the ethyl acrylate, the hollow glass microspheres, the aviation kerosene, the azobisisobutyronitrile A, and the azobisisobutyronitrile B is 3.8-4.4g:1.5-1.8g:4-4.6g:12-14g:230-242mL:0.05-0.1g:0.05-0.1g.

8. A sound-insulating water-based coating for building floor slabs according to claim 4, characterized in that, In step S2, the heating refers to heating to 95-100℃; the isothermal reaction C refers to isothermal reaction under reflux for 20-40 min; and the isothermal reaction D refers to isothermal reaction under reflux for 2-4 h.

9. The sound-insulating water-based coating for building floor slabs according to claim 1, characterized in that, The preparation method of the sound-insulating filler B includes the following steps: Toluene and nano-clay were placed in a reaction vessel under a nitrogen atmosphere. Stirring was started, and the mixture was ultrasonically dispersed. Epoxy silane coupling agent was added, and the temperature was raised. The reaction was carried out at a constant temperature (E). After centrifugation, the solid phase was collected, washed, and dried.

10. A method for preparing a sound-insulating water-based coating for building floor slabs according to any one of claims 1-9, characterized in that, Includes the following steps: Waterborne epoxy resin, sound insulation filler A and sound insulation filler B are placed in a reaction vessel, stirred and dispersed, additives are added, stirred and mixed, and finally waterborne curing agent is added and homogenized.

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