CN104031512A - High-solid content high-build water-based damping coating and preparation method thereof - Google Patents

Abstract

The invention relates to a high solid content thick paste water-based damping paint and a preparation method thereof. The emulsion in the water-based damping paint is a high-solid-content styrene-acrylic emulsion with a low glass transition temperature, and the proportion by weight is as follows: 20-40 parts of emulsion, 1-5 parts of curing agent, 50-60 parts of inorganic filler, 5-10 parts of water 1-2 parts, film-forming aid 1-2 parts, thickener 1-6 parts, water-based dispersant 0.5-2 parts, water-based wetting agent 0.5-3 parts, water-based defoamer 0.5-1.5 parts. The high-build paint is mainly made through three steps: preparation of water-based emulsion, addition of fillers and additives, and letdown. The product has a wide damping temperature range and good damping performance, especially very good low-temperature damping performance. It can be scraped and sprayed, and the thickness of the paint film can reach more than 3mm in one construction. The shear thinning is obvious, and it has good anti-sag property. It does not curl or crack during drying and curing. It has good mechanical properties and can be used in automobiles and various industries. In such mechanical equipment, it plays the role of reducing vibration, sound insulation and noise reduction.

Description

A kind of high-solid-content high-build type water-based damping coating and preparation method thereof

technical field

The invention belongs to the field of preparation of chemical products and water-based coatings, and is especially suitable for coating parts with strong vibrations in the automobile industry, high-speed rail and various mechanical equipment to achieve the effect of shock absorption and noise reduction.

Background technique

Under the principle of developing the coatings industry based on economy, efficiency, ecology and energy, the global coatings market is developing towards water-based, high-solid and solvent-free coatings that are more suitable for environmental protection. The development of water-based damping coatings is also the overall development trend of the composite coatings industry. However, some water-based damping coatings such as CN 102558925 A ensure product quality by adding a part of organic solvent, causing health problems to construction workers and even users.

In the research process of water-based damping coatings, the existing technology usually has a low solid content. Even if the solid content is high, it is prone to sag phenomenon and the viscosity is too high to be easy to apply, which eventually leads to the inability to apply a thick enough coating at one time during construction. Therefore, it is particularly important to synthesize a suitable emulsion system that can disperse more spices and obtain excellent rheological properties through the action of thickeners. In addition, the damping temperature range of the paint film is narrow, and the poor low-temperature damping performance directly leads to poor product performance. Some water-based damping coatings, such as CN102408792 A and CN101864227 A, achieve the purpose of broadening the damping temperature range by compounding emulsions with different glass transition temperatures, but the damping factor is low, the damping efficiency is not high, and the damping temperature range is not high. If it is not wide, it cannot achieve better shock absorption and noise reduction.

Contents of the invention

The technical problem mainly solved by the present invention is to increase the solid content of the paint by configuring an aqueous emulsion with high solid content, stable properties and low viscosity, and to make the paint have the properties of Newtonian fluid by adjusting the type and amount of the thickener. It has good anti-sagging property under zero shearing state, and it becomes thinner strongly under shearing action. It has the characteristics of good fluidity, which is convenient for scraping and spraying construction, and due to the effect of hydrogen bond, it can improve the adhesion of paint film .

In addition, another purpose of the present invention is to widen the damping temperature range of the coating by adjusting the particle size and dosage of the inorganic filler, and by synthesizing a single low glass transition temperature emulsion, the coating has excellent damping performance at low temperature, and ensures that the entire damping It has good damping performance in the temperature range. In addition, by adding a curing agent to cross-link during the drying and curing process of the paint, the paint film has good mechanical properties and adhesion.

A thick-build water-based damping coating with high solid content, characterized in that: water-based styrene-acrylic emulsion (hereinafter referred to as emulsion) is used as base material, heavy calcium carbonate is used as main filler, talcum powder and functional inorganic filler are supplemented, and solidified Agents, coating additives and water, including the following components are proportioned as follows by weight: 20-40 parts of emulsion, 1-5 parts of curing agent, 50-60 parts of inorganic filler, 5-10 parts of water, and 1-5 parts of film-forming aid 2 parts, 1-6 parts of thickener, 0.5-3 parts of water-based dispersant, 0.5-3 parts of water-based wetting agent, 0.5-1.5 parts of water-based defoamer; inorganic fillers include heavy calcium carbonate, talcum powder and functional Inorganic filler with a particle size of 300-2000 mesh; the emulsion is mixed with styrene/acrylate hard monomer, acrylate soft monomer and some functional monomers according to the weight ratio as follows: 20-50: 40-80: 1- 10. The emulsifier accounts for 1.5% to 2% of the total amount of monomers, and the solid content of the emulsion is 40% to 60%.

Further, in the water-based styrene-acrylic emulsion, the hard monomer is one or both of methyl methacrylate and styrene; the acrylate soft monomer is butyl acrylate; the functional monomer is carboxyl, amino or One or more compounded amide-based monomers, emulsifiers are low-foaming ethylene oxide and propylene oxide block copolymers (PE6100), sulfosuccinate derivatives (EF810) and dodecane Several types of sodium diphenylsulfonate (DSB) are compounded and used in equal mass proportions.

Further, the functional inorganic filler is one or both of flake mica powder and vermiculite powder.

Further, the curing agent is an amino resin curing agent.

Further, the film-forming aid is a propylene glycol ether film-forming aid.

Further, the thickener is one or more of fumed silica, bentonite, hydroxyethyl cellulose, byk-420, byk-425, byk-428, and byk-430.

Further, the water-based dispersant is one or two of byk-154, byk-182, and byk-190 compounded in a mass ratio of 1:1 to 1:2; the water-based wetting agent is byk306, byk- One or two of 307, byk-333, byk346 are compounded in equal mass proportions; the water-based defoamer is one or two of byk-011, byk-015, byk-024, and tego-815 in the ratio of 1: Compound within the mass ratio range of 1～1:2.

The method for preparing described high solid content thick build type waterborne damping coating is characterized in that comprising the following steps:

(1) Preparation of water-based styrene-acrylic emulsion

First add 5% to 15% of the monomer mass, emulsifier, pH buffer and 30% to 50% of water into the reaction kettle, turn on the stirring device and heating device to 60°C to 85°C, and pass nitrogen protection throughout. After dissolving half of the initiator in water, add dropwise for 0.25-1.5 hours to react, and after dripping, mature for 0.5-1 hour to obtain seed emulsion.

Pre-emulsify the remaining 85% to 95% monomer, emulsifier, pH buffer and the remaining 70% to 50% water into the reactor by stirring for 0.5 to 2 hours. agent, the dropping time is 2 to 5 hours. After aging for 2-4 hours, the water-based styrene-acrylic emulsion can be obtained.

(2) Dispersion of fillers

Add 1 to 2 parts of water-based dispersant and 0.1 to 0.5 parts of defoamer in 8 to 20 parts of water, add 80 to 90 parts of heavy calcium carbonate for dispersion, and finally add 0 to 1 part of wetting agent and 0 to 0.5 parts of polyurethane thickener, the solid content of slurry A is 80%-90%. Add 1 to 2 parts of water-based dispersant and 0.1 to 0.5 parts of defoamer in 25 to 30 parts of water, add 70 to 75 parts of talc powder and mica powder for dispersion, and the mass ratio of the two is 2:1 to 6:1, and finally Add 0-0.4 parts of wetting agent and 0-0.3 parts of polyurethane thickener to obtain slurry B with a solid content of 70%-75%.

(3) Preparation of paint

The paint is mixed by a high-speed mixer, and the speed is 1000r/min～4000r/min. After adjusting the pH of the above 20-40 parts of the emulsion to 8.5-9.3, add 1-5 parts of curing agent, then add 0-0.5 parts of wetting agent, 0.5-1 part of dispersant and 0.5-1 part of defoamer , add 40-55 parts of the above-mentioned slurry A and 8-12 parts of the above-mentioned slurry B, add 1-5 parts of mica powder and vermiculite powder or one or both, the mass ratio of the two is 0:1-3:1.5, After uniform dispersion, add 1-6 parts of thickener to adjust the consistency, and finally add 1-2 parts of film-forming aid to obtain high-solid thick-build water-based damping paint.

The high-solid-content thick-build water-based damping coating of the present invention uses styrene-acrylic emulsion with a solid content of 40% to 60% and high stability as the base material, and uses heavy calcium carbonate as the main filler, supplemented by inorganic materials such as talcum powder. Filler, adjust the amount of emulsion and filler and the particle size of the filler to change the low-temperature damping property and damping temperature range of the coating, and adjust the mechanical properties of the coating by adding a curing agent. In addition, the anti-rheological and scraping performance of the coating can be adjusted by adjusting the amount of different thickeners and the overall solid content of the coating. The invention can be used in automobiles and other mechanical equipments where medium-vibrated workpieces play the role of shock absorption and noise reduction. It has a wide damping temperature range and damping performance, good mechanical properties and coating properties, low cost, and stable properties of the emulsion base material, which can be mass-produced industrially and has good application prospects.

Detailed ways

Example 1

(1) Preparation of water-based styrene-acrylic emulsion

First mix 27.75g styrene, 45g butyl acrylate, 0.75g methacrylic acid, 1.5 methacrylamide, 4.076g DSB, 1.875gPE6100, 5.357gEF810, 0.75gNaHCO3, 300g water and add them into the reaction kettle, turn on the speed of the stirring device It is 330r/min and the heating device is up to 82°C, and the whole process is protected by nitrogen gas. 1.125g of ammonium persulfate and 1.125g of sodium bisulfite were respectively dissolved in 25g of water and then added dropwise for 35 minutes to react, and the seed emulsion was obtained after aging for 30 minutes.

Then mix 249.75g styrene, 405g butyl acrylate, 6.75g methacrylic acid, 13.5g methacrylamide, 4.076g DSB, 1.875gPE6100, 5.357gEF810, 0.75gNaHCO3, 300g water and mix well, then pre-emulsify by stirring for 0.5h and drop together Add it to the reaction kettle, and at the same time, add the initiator dropwise. The initiator is 1.125g ammonium persulfate and 1.125g sodium bisulfite. The two are respectively dissolved in 50g water, and the dropping time is 5h. After aging for 3 hours, the water-based styrene-acrylic emulsion can be obtained.

(2) Dispersion of fillers

Add 20g190 to 100g water, stir evenly with a high-speed mixer at 1600r/min, add 1.5gbyk-011 and 3.5gbyk-024, disperse at 3000r/min for 10min, add 900g heavy calcium (1250 mesh) at 1000r/min, and finish adding Finally, adjust the rotation speed to 2000r/min to disperse evenly. After the slurry is smooth and stable, add 10gbyk-333, 3.5gbyk-425 and 3.5gbyk-428. Pay attention to the modification of these terms. It is best to provide the company name in Chinese and English and keep the rotation speed for 10 minutes. That is, heavy calcium slurry is obtained.

Add 30g190 to 150g water, stir evenly with a high-speed mixer at 1600r/min, add 1.5gbyk-011 and 3.5gbyk-024, disperse at 3000r/min for 10min, add 375g talcum powder (1250 mesh) and 75g mica at a speed of 1000r/min Powder (1000 mesh), after adding, adjust the speed to 2000r/min to disperse evenly, add 5gbyk-333, 2gbyk-425 and 2gbyk-428 after the slurry is smooth and stable, keep stirring at the speed for 10min to get talcum powder and mica powder slurry Material, hereinafter referred to as slip cloud slurry.

(3) Preparation of paint

With a high-speed mixer at 1600r/min, add 19.25g of methyl etherified melamine (CYEML385) to 100g of emulsion, then add 3g of aminomethyl propanol to adjust the pH. Note the modification of these terms to 8.8-9.0. After stirring for 10 minutes, add 1.93g of byk-333 and 1.93gbyk-190, 1.93gbyk-011 and 1.93g byk-024, adjust the speed to 3000r/min, stir for 15min. Then in another beaker, add heavy calcium slurry in 214g step (2), 32.6g step (2) medium slip, cloud slurry, 3.85g vermiculite powder (325 order) and 11.55g mica powder (400 order), as far as possible After stirring evenly, add it into the emulsion at a speed of 1000r/min. After adding, adjust the speed to 2000r/min and stir evenly. After 15 minutes, when the liquid level is stable, add 3.85g of fumed silica and 3.85g of bentonite, and stir for 5 minutes after adding Then add 1.93gbyk-425, 7.70gDPNB and 5.77gQP3000H, and finally add 1.93gbyk-333 to obtain a high-solid thick-build water-based damping coating. Condensed water is used to cool down the whole process of paint mixing.

Example 2

(1) Preparation of water-based styrene-acrylic emulsion

Same as Example 1.

(2) Dispersion of fillers

Same as Example 1

(3) Preparation of paint

With a high-speed mixer at 1600r/min, add 19.25g of methyl etherified melamine (CYEML385) to 100g of emulsion, then add 3g of aminomethylpropanol to adjust the pH to 8.8-9.0, stir for 10min, then add 1.93g of byk-333 and 1.93g of byk-190 and 1.93g byk-011 and 1.93g byk-024, adjust the speed to 3000r/min, stir for 15min. Then in another beaker, add heavy calcium slurry in 214g step (2), 32.6g step (2) medium slip, cloud slurry, 3.85g vermiculite powder (325 order) and 11.55g mica powder (1000 order), as far as possible After stirring evenly, add it into the emulsion at a speed of 1000r/min. After adding, adjust the speed to 2000r/min and stir evenly. After 15 minutes, when the liquid level is stable, add 3.85g of fumed silica and 3.85g of bentonite, and stir for 5 minutes after adding Then add 1.93g byk-425, 7.70gDPNB and 5.77gQP3000H, and finally add 1.93g byk-333 to obtain a high-solid thick-build water-based damping coating. Condensed water is used to cool down the whole process of paint mixing.

Example 3

(1) Preparation of water-based styrene-acrylic emulsion

Same as Example 1.

(2) Dispersion of fillers

Add 20g of 190 to 100g of water, stir evenly with a high-speed mixer at 1600r/min, then add 1.5g of byk-011 and 3.5g of byk-024, disperse at 3000r/min for 10min, add 900g of heavy calcium (of which 1250 mesh The mass ratio of calcium to 800 mesh heavy calcium and 400 mesh heavy calcium is 1:2:2). After adding, adjust the speed to 2000r/min to disperse evenly. After the slurry is smooth and stable, add 10g byk-333, 3.5g For byk-425 and 3.5gbyk-428, keep stirring at the rotating speed for 10 minutes to obtain heavy calcium slurry.

Add 30g190 to 150g water, stir well at 1600r/min with a high-speed mixer, add 1.5g byk-011 and 3.5g byk-024, disperse at 3000r/min for 10min, add 375g talcum powder (1250 mesh) and 75g mica powder (1000 mesh), after adding, adjust the speed to 2000r/min to disperse evenly, add 5g byk-333, 2g byk-425 and 2g byk-428 after the slurry is smooth and stable, keep stirring at the speed for 10min to get talc Powder, mica powder slurry, hereinafter referred to as slip cloud slurry.

(3) Preparation of paint

With a high-speed mixer at 1600r/min, add 19.25g of methyl etherified melamine (CYEML385) to 100g of emulsion, then add 3g of aminomethylpropanol to adjust the pH to 8.8-9.0, stir for 10min, then add 1.93g of byk-333 and 1.93g of byk-190 and 1.93g byk-011 and 1.93g byk-024, adjust the speed to 3000r/min, stir for 15min. Then in another beaker, add heavy calcium slurry in 214g step (2), 32.6g step (2) medium slip, cloud slurry, 3.85g vermiculite powder (325 order) and 11.55g mica powder (400 order), as far as possible After stirring evenly, add it into the emulsion at a speed of 1000r/min. After adding, adjust the speed to 2000r/min and stir evenly. After 15 minutes, when the liquid level is stable, add 3.85g of fumed silica and 3.85g of bentonite, and stir for 5 minutes after adding Then add 1.93g byk-425, 7.70gDPNB and 5.77gQP3000H, and finally add 1.93g byk-333 to obtain a high-solid thick-build water-based damping coating. Condensed water is used to cool down the whole process of paint mixing.

Example 4

(1) Preparation of water-based styrene-acrylic emulsion

Same as Example 1.

(2) Dispersion of fillers

Same as Example 1.

(3) Preparation of paint

With a high-speed mixer at 1600r/min, add 19.25g of methyl etherified melamine (CYEML385) to 100g of emulsion, then add 3g of aminomethylpropanol to adjust the pH to 8.8-9.0, stir for 10min, then add 1.93g of byk-333 and 1.93g of byk-190 and 1.93g byk-011 and 1.93g byk-024, adjust the speed to 3000r/min, stir for 15min. Then in another beaker, add heavy calcium slurry in 214g step (2), 32.6g step (2) medium slip, cloud slurry, 5.77g vermiculite powder (325 order) and 11.55g mica powder (400 order), as far as possible After stirring evenly, add it into the emulsion at a speed of 1000r/min. After adding, adjust the speed to 2000r/min and stir evenly. After 15 minutes, when the liquid level is stable, add 3.85g of fumed silica and 3.85g of bentonite, and stir for 5 minutes after adding Then add 1.93g byk-425, 7.70gDPNB and 5.77gQP3000H, and finally add 1.93g byk-333 to obtain a high-solid thick-build water-based damping coating. Condensed water is used to cool down the whole process of paint mixing.

Example 5

(1) Preparation of water-based styrene-acrylic emulsion

First mix 27.75g styrene, 45g butyl acrylate, 0.75g methacrylic acid, 1.5 methacrylamide, 4.076g DSB, 1.875gPE6100, 5.357gEF810, 0.75gNaHCO3, 200g water and add them into the reaction kettle, turn on the speed of the stirring device It is 330r/min and the heating device is up to 60°C, and the whole process is protected by nitrogen gas. 1.125g of ammonium persulfate and 1.125g of sodium bisulfite were respectively dissolved in 25g of water and added dropwise for 55min to react, and the seed emulsion was obtained after aging for 30min.

Then mix 249.75g styrene, 405g butyl acrylate, 6.75g methacrylic acid, 13.5g methacrylamide, 4.076g DSB, 1.875gPE6100, 5.357gEF810, 0.75gNaHCO3, 400g water, mix them well, pre-emulsify them by stirring for 0.5h, and drop them together Add it into the reaction kettle, and at the same time add the initiator dropwise, the initiator is 1.125g ammonium persulfate and 1.125g sodium bisulfite, dissolve the two in 50g water respectively, and the dropwise addition time is 2h. After aging for 2 hours, the water-based styrene-acrylic emulsion can be obtained.

(2) Dispersion of fillers

Same as Example 1.

(3) Preparation of paint

With a high-speed mixer at 1600r/min, add 19.25g of methyl etherified melamine (CYEML385) to 100g of emulsion, then add 3g of aminomethylpropanol to adjust the pH to 8.8-9.0, stir for 10min, then add 1.93g of byk-333 and 1.93g of byk-190 and 1.93g byk-011 and 1.93g byk-024, adjust the speed to 3000r/min, stir for 15min. Then add heavy calcium slurry in 214g step (2) in another beaker, 32.6g step (2) slippery, cloud slurry, 3.85g vermiculite powder (325 orders), after stirring as far as possible, at 1000r/min rotating speed Add it into the emulsion, and after the addition, adjust the speed to 2000r/min and stir evenly. After 15 minutes, when the liquid level is stable, add 3.85g of fumed silica and 3.85g of bentonite, stir for 5 minutes after the addition, and then add 3.85g of byk-333, gQP3000H, 3.85g byk-425, 3.85gbyk-428 and 7.70gDPNB, can obtain high solid content thick build waterborne damping coating. Condensed water is used to cool down the whole process of paint mixing.

Example 6

(1) Preparation of water-based styrene-acrylic emulsion

Same as Example 5

(2) Dispersion of fillers

Same as Example 1.

(3) Preparation of paint

With a high-speed mixer at 1600r/min, add 19.25g of methyl etherified melamine (CYEML385) to 100g of emulsion, then add 3g of aminomethylpropanol to adjust the pH to 8.8-9.0, stir for 10min, then add 1.93g of byk-307 and 1.93g of byk-190 and 1.93g byk-011 and 1.93g byk-024, adjust the speed to 3000r/min, stir for 15min. Then add heavy calcium slurry in 214g step (2) in another beaker, 32.6g step (2) slippery, cloud slurry, 3.85g vermiculite powder (325 orders), after stirring as far as possible, at 1000r/min rotating speed Add it into the emulsion, and after the addition, adjust the speed to 2000r/min and stir evenly. After 15 minutes, when the liquid level is stable, add 3.85g of fumed silica and 3.85g of bentonite, stir for 5 minutes after the addition, and then add 3.85g of byk-307, gQP3000H, 3.85g byk-425, 3.85gbyk-428 and 7.70gDPNB, can obtain high solid content thick build waterborne damping coating. Condensed water is used to cool down the whole process of paint mixing.

Comparing the emulsion stability of Examples 1 to 6, evaluate whether the emulsion is stable through calcium ion stability. Wherein the calcium ion stability test method is to add 5 g of calcium chloride aqueous solution with a mass fraction of 1% to 20 g of the emulsion whose pH is adjusted to 8.8 to 9, and after standing at room temperature for 48 hours, observe whether the emulsion is demulsified, delaminated, and the precipitation is small. For granular flocculation substances, if there is no above phenomenon, the calcium ion will pass stably, otherwise it will not pass.

Table 1

experimental project Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Calcium ion stability pass pass pass pass pass pass

The damping temperature range and damping performance of thick-build water-based damping coatings of Examples 1-6 and the rheological properties of 2.2mm blade coating are compared. The test results are shown in Table 2. Among them, the damping factor above 0.3 indicates that it has a shock-absorbing effect.

Table 2

The above examples are only some examples of the present invention, and are not intended to limit the present invention in any other form. Any skilled person who is familiar with this profession may use the technical content disclosed above to change or remodel it into an example of equivalent change, provided that it does not depart from this technology. If the invention conflicts, any simple modification based on the technical essence of the present invention still belongs to the protection category of the technical solution of the present invention.

Claims (8)

1. A high-solid-content thick-build water-based damping coating, characterized in that: hereinafter referred to as the emulsion with water-based styrene-acrylic emulsion as the base material, heavy calcium carbonate as the main filler, supplemented with talcum powder and functional inorganic fillers, and Add curing agent, coating additives and water, including the following components according to the weight ratio: 20-40 parts of emulsion, 1-5 parts of curing agent, 50-60 parts of inorganic filler, 5-10 parts of water, film-forming aid 1-2 parts, 1-6 parts of thickener, 0.5-3 parts of water-based dispersant, 0.5-3 parts of water-based wetting agent, 0.5-1.5 parts of water-based defoamer; inorganic fillers include heavy calcium carbonate, talcum powder and Functional inorganic filler with a particle size of 300-2000 mesh; the emulsion is prepared by mixing styrene/acrylate hard monomer, acrylate soft monomer and some functional monomers according to the weight ratio as follows: 20-50: 40-80: 1-10, the emulsifier accounts for 1.5%-2% of the total amount of monomers, and the solid content of the emulsion is 40%-60%. 2. according to the described high solid content thick build type water-based damping coating of claim 1, its water-based styrene-acrylic emulsion, hard monomer is methyl methacrylate, one or both in styrene; Acrylic acid ester soft monomer It is butyl acrylate; the functional monomer is one or several compounded with carboxyl, amino or amido monomers. 3. according to the described high-solid-content high-build type water-based damping paint of claim 1, its functional inorganic filler is one or more in flake mica powder, vermiculite powder. 4. according to claim 1, the high-solid thick build water-based damping paint, its curing agent system is an amino resin curing agent. 5. according to the described high-solid-content high-build type water-based damping paint of claim 1, its film-forming aid is propylene glycol ethers film-forming aid. 6. According to claim 1, the high-solid thick-build water-based damping paint, the thickener is fumed silica, bentonite, hydroxyethyl cellulose, byk-420, byk-425, byk-428, byk-430 one or more of them. 7. According to claim 1, the high-solid-content high-build water-based damping coating, the water-based dispersant is one or two of byk-154, byk-182, and byk-190 in a mass ratio of 1:1 to 1:2 Compounded within the ratio range; water-based wetting agent is one or two of byk306, byk-307, byk-333, byk346 compounded in equal mass ratio; water-based defoamer is byk-011, byk-015, byk One or two of -024 and tego-815 are compounded at a mass ratio of 1:1 to 1:2. 8. the method for preparing the described high solid content thick build type water-based damping coating of claim 1 is characterized in that comprising the following steps: (1) Preparation of water-based styrene-acrylic emulsion First add 5% to 15% of the monomer, emulsifier, pH buffer and 30% to 50% of water into the reaction kettle, turn on the stirring device and the heating device to 60 ° C ~ 85 ° C, and protect the whole process with nitrogen gas; After the initiator is dissolved in water, add dropwise for 0.25~1.5h to react, and after dripping, mature for 0.5~1h to obtain the seed emulsion; Pre-emulsify the remaining monomers, emulsifiers, pH buffers and water for 0.5-2 hours by stirring and then add them dropwise into the reactor. At the same time, add the remaining initiators dropwise for 2-5 hours; then mature 2 to 4 hours to obtain water-based styrene-acrylic emulsion; (2) Dispersion of fillers Add 1 to 2 parts of water-based dispersant and 0.1 to 0.5 parts of defoamer in 8 to 20 parts of water, add 80 to 90 parts of heavy calcium carbonate for dispersion, and finally add 0 to 1 part of wetting agent and 0 to 0.5 parts of polyurethane Thickener to obtain slurry A with a solid content of 80% to 90%; add 1 to 2 parts of water-based dispersant and 0.1 to 0.5 parts of defoamer to 25 to 30 parts of water, and add 70 to 75 parts of talc powder and mica powder Disperse, the ratio of the two is 2:1-6:1, and finally add 0-0.4 parts of wetting agent and 0-0.3 parts of polyurethane thickener to obtain slurry B with a solid content of 70%-75%; (3) Preparation of paint The paint is adjusted by a high-speed mixer, and the speed is 1000r/min~4000r/min; after adjusting the pH of the above 20~40 parts of the emulsion to 8.5~9.3, add 1~5 parts of curing agent, and then add 0~0.5 parts of wetting agent, After 0.5-1 part of dispersant and 0.5-1 part of defoamer, add 40-55 parts of the above slurry A and 8-12 parts of the above-mentioned slurry B, and add 1-5 parts of mica powder and vermiculite powder. The ratio is 0:1~3:1.5. After the dispersion is uniform, add 1~6 parts of thickener to adjust the consistency, and finally add 1~2 parts of coalescent to obtain high solid content thick build water-based damping coating.