WO2021012541A1

WO2021012541A1 - Aqueous polyacrylate emulsion, preparation method therefor and application method therefor

Info

Publication number: WO2021012541A1
Application number: PCT/CN2019/120341
Authority: WO
Inventors: 孙玉明
Original assignee: 江苏康爱特环境工程集团有限公司
Priority date: 2019-07-25
Filing date: 2019-11-22
Publication date: 2021-01-28
Also published as: CN110330853A

Abstract

An aqueous polyacrylate emulsion and a preparation method therefor. Said emulsion comprises the following components: an acrylate soft monomer, an acrylate hard monomer, an organic polybasic phosphonic acid, a polar monomer, an intra-crosslinking monomer, a silane coupling agent, a functional monomer, an anionic emulsifier, a buffer, a nonionic emulsifier, an antifoaming agent, a wetting agent, an initiator, deionized water, a pH modifiers, a nano-sol, and alkaline cyclodextrin. During application, calcium carbonate, titanium dioxide powder, a film-forming additive and a dispersant are added to an aqueous acrylate adhesive emulsion, stirred and mixed for uniform dispersion, and coated on a road or bridge surface with an asbestos tile as the substrate.

Description

Aqueous polyacrylate emulsion and preparation method and application method thereof

Technical field

The invention relates to the field of polymer materials, in particular to an aqueous polyacrylate emulsion and a preparation method and application method thereof.

Background technique

As people’s requirements for environmental protection increase, in the field of coatings, in order to reduce the emission of volatile organic compounds, environmentally friendly coatings have gradually replaced solvent-based coatings. Among environmentally friendly paints, water-based paints use water as a solvent or dispersion medium, which greatly reduces pollution and is easy to construct. However, the overall performance of water-based coatings is not as good as that of solvent-based coatings, especially those used in various fields such as roads and bridge decks. Not only do emulsions have excellent water resistance, but also coatings have excellent alkali resistance, abrasion resistance and resistance. Impact performance and adhesion to road asphalt. In the field of traffic and roads, coatings also have special requirements such as easy construction, fast drying, and short maintenance time. The waterborne acrylic coatings in the prior art cannot meet the above requirements.

Summary of the invention

The purpose of the present invention is to provide an aqueous polyacrylate emulsion, which has the advantages of strong adhesion to asphalt roads, easy construction, quick drying and short curing time.

The above technical objectives of the present invention are achieved through the following technical solutions:

A water-based polyacrylate emulsion, calculated in parts by weight, including the following components: 68-78 parts of acrylate soft monomer, 13-18 parts of acrylate hard monomer, 2-6 parts of polar monomer, internally delivered 1-3 parts of co-monomer, 1.3-2 parts of silane coupling agent, 2-6 parts of functional monomer, 1-2 parts of anionic emulsifier, 0.1-0.3 part of buffer, 0.5-1 part of non-ionic emulsifier, 0.01-0.06 parts of defoamer, 0.01-0.05 parts of wetting agent, 0.2-1.0 parts of initiator, 90-180 parts of deionized water, 0.2-5 parts of PH value regulator, 0.2-0.5 parts of nano sol, alkaline ring 0.2-0.7 parts of dextrin.

Further, the soft acrylate monomer is any one or a mixture of butyl acrylate or isooctyl acrylate.

Further, the acrylate hard monomer is any one or a mixture of methyl acrylate, ethyl acrylate, methyl methacrylate, or vinylpyrrolidone. The addition of acrylate hard monomer allows the acrylate hard monomer and silane coupling agent to form a molecular chain to be embedded in the flexible segment, thereby improving the permeability of the water-based acrylate emulsion and allowing it to quickly penetrate into the asphalt pavement during road construction , To achieve the purpose of easy construction and short maintenance time.

Further, the organic polybasic phosphonic acid is any one or a mixture of ethylenediamine tetramethylene phosphonic acid, hydroxyphosphonoacetic acid, hydroxyethylidene diphosphonic acid or hydroxymethylene phosphonic acid. Organic polyphosphonic acid is a kind of organometallic chelating agent. During the application process of the application material, it can chelate and coordinate with the metal ions in calcium carbonate and titanium dioxide to form a more stable chemical bond and form a denser film , Thereby improving the weather resistance and toughness of the materials of this application.

Further, the nano sol is any one of nano carbon sol, nano aluminum sol or nano titanium sol. The above-mentioned nano-sol has a high specific surface area and large pore size, which can lock water deeply, increase the viscosity of the water-based acrylic emulsion, thereby improving its ability to bond with asphalt pavement; when dried, the nano-sol loses moisture and interacts with asphalt. The material forms a strong carbon-oxidation bond, aluminum-oxidation bond or titanium-oxidation bond, so that the water-based paint is tightly combined on the surface of the asphalt pavement and forms a dense oxide film, which is resistant to strong acids, alkalis, and wear characteristic.

Further, the functional monomer is any one or a mixture of acrylonitrile, hydroxyethyl acrylate, hydroxypropyl acrylate, or hydroxybutyl acrylate. The addition of hydroxypropyl acrylate and hydroxybutyl acrylate improves the shortcomings of insufficient flexibility of water-based acrylic coatings, and effectively improves the elongation of the water-based acrylic coatings at chain break.

Further, the internal crosslinking monomer is any one or a mixture of glycidyl methacrylate, N-methylolacrylamide or acrylamide.

Further, the silane coupling agent is any one of vinyltrimethoxysilane, trimethylethoxysilane or vinyltriethoxysilane. The addition of the silane coupling agent makes the acrylate hard monomer, the acrylate soft monomer and the internal crosslinker combine together to form a stable three-dimensional structure and improve the wear resistance of the water-based acrylic coating.

Further, the anionic emulsifier is any one or a mixture of two of nonylphenol polyoxyethylene ether ammonium sulfate or sodium alkyl alcohol polyether succinate monoester sulfonate.

Further, the nonionic emulsifier is alkylphenol polyoxyethylene ether. The addition of alkylphenol polyoxyethylene ether further improves the abrasion resistance of waterborne acrylic coatings.

Further, the buffering agent is sodium bicarbonate.

Further, the defoamer is any one or a mixture of two of mineral oils or polyether modified silicones.

Further, the wetting agent is dioctyl sodium succinate.

Further, the initiator is any one or a mixture of potassium persulfate or sodium persulfate.

Further, the pH adjusting agent is ammonia water.

Further, a method for preparing an aqueous polyacrylate emulsion includes the following steps:

S1. Stir the anionic emulsifier, nonionic emulsifier, and deionized water to obtain the emulsifier aqueous solution;

S2. Add acrylate hard monomer, acrylate soft monomer, polar monomer, functional monomer, internal crosslinking monomer and silane coupling agent to S1, stir to prepare a pre-emulsion;

S3. Add deionized water to the initiator and stir to obtain an aqueous initiator solution;

S4. Add deionized water and buffering agent to the reaction kettle and heat, inject part of the pre-emulsion solution obtained by S1 and the initiator aqueous solution obtained by part S2, and react to prepare a seed emulsion;

S5. Add the remaining S1 to the pre-emulsion solution and the remaining S2 to obtain the initiator aqueous solution at the same time dropwise into the seed emulsion, increase the temperature to 84-86°C and keep the temperature for 1 hour, and then lower the temperature;

S6. When the temperature of S5 drops below 50°C, add a pH regulator to it to adjust the pH value, then add a defoamer and a wetting agent, stir until the emulsion is uniform, and filter the material to obtain an aqueous acrylate emulsion.

S2. Add acrylate hard monomer, acrylate soft monomer, polar monomer, functional monomer, internal crosslinking monomer and silane coupling agent to S1, stir at high speed 800r/min×45min, and prepare Emulsion

S4. Add deionized water and buffer to the reactor and heat to 82～84℃, inject 5-20% of the pre-emulsion obtained by S1 and 4-25% of the initiator aqueous solution obtained by S2, and react for 25-40min. Get seed emulsion;

S5. Add the remaining S1 to the pre-emulsion solution and the remaining S2 to obtain the initiator aqueous solution at the same time within 3 to 4 hours, and add them dropwise to the seed emulsion at the same time. The temperature is increased to 84-86°C and the temperature is kept for 1 hour;

S6. When the temperature of S5 drops below 50°C, add a pH regulator to adjust the pH to 7-7.5, then add a defoamer and a wetting agent, stir for 20-30 minutes until the emulsion is uniform, and filter the material to obtain an aqueous acrylic emulsion .

Further, an application method of water-based acrylate emulsion is to add calcium carbonate, titanium dioxide, film-forming aids, and dispersing agents to the water-based acrylate emulsion, stir, mix, and disperse uniformly, and use asbestos tiles as a substrate for road or bridge decks. Carry out coating. Under the action of the film-forming assistant, the metal ions in calcium carbonate and titanium dioxide react with the nano-sol to form a long-range orderly crystalline film attached to the water-based acrylic paint, further enhancing the hardness and strength of the water-based acrylic paint. Improve its wear resistance.

Further, when in use, add 330 parts of calcium carbonate and 150 parts of titanium dioxide to 300 parts of acrylate latex, add 1 part of film-forming aids, 0.46 parts of dispersant, stir, mix and disperse uniformly, and use asbestos tile as the substrate for coating Cloth, coating a sample with a thickness of 150μm for testing.

In summary, the present invention has the following beneficial effects:

1. The use of acrylate hard monomer and acrylate soft monomer is used to make the acrylate hard monomer and the silane coupling agent form a molecular chain embedded in the flexible segment, thereby improving the permeability of the water-based acrylate emulsion and making it It can quickly penetrate into the asphalt pavement during the road construction process to achieve the purpose of facilitating construction and short maintenance time;

2. Adopting nano sol with high specific surface area, this type of sol not only has good dispersibility in water but also has large pore size, can lock water deeply, increase the viscosity of water-based acrylic emulsion, and improve its connection with asphalt pavement When dried, the nanosol loses moisture and forms a strong carbon-oxidation bond, aluminum-oxidation bond or titanium-oxidation bond with the asphalt material, so that the water-based coating can be tightly combined on the surface of the asphalt pavement and form a dense layer The oxide film has the characteristics of strong acid resistance, strong alkali resistance and abrasion resistance.

3. During the construction process, the metal ions in calcium carbonate and titanium dioxide react with the nano sol under the action of the film-forming assistant to form a long-range and orderly crystalline film attached to the water-based acrylic paint, further enhancing the water-based acrylic The hardness and strength of the ester coating improve its wear resistance.

4. The addition of alkaline cyclodextrin can effectively improve the dispersion performance of the coating itself, and has strong adsorption, can effectively improve the adhesion of the coating, help the film formation of the water-based coating, thereby improving the water-based acrylic coating Wear resistance and weather resistance.

Detailed ways

Example 1: Aqueous acrylate emulsion and its preparation method and application method

Calculated in parts by weight, including the following components: 1 part of anionic emulsifier allyloxynonylphenol propanol polyoxyethylene (10) ether ammonium sulfate, 1 part of ethylenediamine tetramethylene phosphonic acid, 0.3 part of nano titanium Sol, 180 parts deionized water, 3 parts glycidyl methacrylate, 78 parts methyl methacrylate, 6 parts butyl acrylate, 2 parts isooctyl acrylate, 5 parts acrylonitrile, 2 parts methacrylic acid, 5 Parts of hydroxypropyl acrylate, 1.5 parts of trimethylethoxysilane, 0.8 parts of ammonium persulfate, 0.8 parts of ammonia, 0.01 parts of defoamer mineral oil (San Nopco 8370) and 0.01 parts of wetting agent dioctyl succinate Sodium sulfonate, 0.2 parts of alkaline cyclodextrin.

The preparation method is as follows:

S1. Weigh 1 part of anionic emulsifier allyloxynonylphenol propanol polyoxyethylene (10) ether ammonium sulfate, 1 part of ethylenediamine tetramethylene phosphonic acid, 70 parts of deionized water, 0.3 parts of nano titanium sol , Stir at room temperature to obtain the emulsifier aqueous solution;

S2. Slowly add 3 parts glycidyl methacrylate to S1, then add 78 parts methyl methacrylate, 6 parts butyl acrylate, 2 parts isooctyl acrylate, 5 parts acrylonitrile, 2 parts methacrylic acid, A mixed monomer consisting of 5 parts of hydroxypropyl acrylate and 1.5 parts of trimethylethoxysilane was stirred for 45 minutes at a stirring speed of 800 r/min to prepare pre-emulsion 1.

S3. Weigh 0.8 parts of ammonium persulfate, add 20 parts of deionized water to dissolve, and prepare the initiator aqueous solution 2;

S4. Heat 90 parts of deionized water to 80°C, add 5% pre-emulsion 1 and 2% initiator aqueous solution 2, and react for 60 minutes to prepare a seed emulsion;

S5. Add the remaining pre-emulsion 1 and the initiator aqueous solution 2 dropwise to the seed emulsion at the same time within 3 hours, then increase the temperature to 85°C, keep the temperature for 1 hour, and lower the temperature to 40°C;

S6. Add 0.8 parts of ammonia to S5 to adjust the pH to 7.5, and finally add 0.01 parts of defoamer mineral oil (San Nopco 8370), 0.01 parts of wetting agent dioctyl sodium succinate and 0.2 parts of alkaline ring Dextrin, stir for 10 minutes until the emulsion is uniform, and filter the material to obtain an acrylic emulsion.

Application method:

Calculated in parts by weight, add 330 parts of calcium carbonate and 150 parts of titanium dioxide to 300 parts of acrylic latex, add 1 part of film-forming aids, 0.46 parts of dispersant, stir, mix and disperse evenly, and use asbestos tile as the base material for coating Cloth, coating a sample with a thickness of 150μm for testing.

Example 2: Aqueous acrylate emulsion and its preparation method and application method

Calculated by mass parts, including the following components: 1 part allyloxy nonylphenol propanol polyoxyethylene (10) ether ammonium sulfate, 0.8 parts hydroxyphosphonoacetic acid, 0.2 parts nano aluminum sol, 90 parts deionized water , 1 part N-methylol acrylamide, 60 parts methyl methacrylate, 8 parts acrylonitrile, 12 parts butyl acrylate, 6 parts hydroxybutyl acrylate, 2 parts methacrylic acid and 1.8 parts vinyl trimethoxy Silane, 0.3 parts of ammonium persulfate, 2 parts of ammonia, 0.05 parts of defoamer mineral oil, 0.05 parts of wetting agent dioctyl sodium succinate, 0.5 parts of alkaline cyclodextrin.

Preparation:

S1. Weigh 1 part of allyloxy nonylphenol propanol polyoxyethylene (10) ether ammonium sulfate, 0.8 parts of alkylphenol polyoxyethylene (40) ether, 40 parts of deionized water, 0.2 parts of nano aluminum sol, Stir at room temperature to obtain the emulsifier aqueous solution;

S2. Slowly add 1 part of N-methylol acrylamide, then add 60 parts of methyl methacrylate, 8 parts of acrylonitrile, 12 parts of butyl acrylate, 6 parts of hydroxybutyl acrylate, 2 parts of methacrylic acid and 1.8 parts The mixed monomers composed of vinyl trimethoxysilane were stirred for 45 minutes at a stirring speed of 800 r/min to prepare pre-emulsion 1;

S3. Weigh 0.3 parts of ammonium persulfate and add 10 parts of deionized water to dissolve to obtain the initiator aqueous solution 2;

S4. Heat 40 parts of deionized water to 80°C, add 5% pre-emulsion 1 and 5% initiator aqueous solution 2, and react for 60 minutes to prepare a seed emulsion;

S5. Add the remaining pre-emulsion 1 and the initiator aqueous solution 2 dropwise to the seed emulsion at the same time in 3 hours, then increase the temperature to 85°C, keep the temperature for 1 hour, and lower the temperature to 40°C.

S6. Add 2 parts of ammonia water to S5 to adjust the pH to 7.5, and finally add 0.05 parts of defoamer mineral oil, 0.05 parts of wetting agent dioctyl sodium succinate and 0.5 parts of alkaline cyclodextrin, and stir for 10 minutes to emulsion Evenly, filter out the material to obtain water-based polyacrylate emulsion.

Application method:

When in use, add 330 parts of calcium carbonate and 150 parts of titanium dioxide to 300 parts of acrylate glue emulsion, add 1 part of film-forming aids, 0.46 parts of dispersant, stir and mix and disperse evenly, and use asbestos tile as the substrate for coating. A sample with a cloth thickness of 150 μm was tested.

Example 3: Aqueous acrylate emulsion and its preparation method and application method

Calculated according to mass parts, including the following components:

1.3 parts of anionic emulsifier allyloxynonylphenol propanol polyoxyethylene (10) ether ammonium sulfate, 0.7 parts of hydroxymethylene phosphonite, 0.5 parts of nano carbon sol, 120 parts of deionized water, 0.5 parts of N-hydroxyl Methacrylamide, 0.8 parts glycidyl methacrylate, 69 parts methyl methacrylate, 3 parts isooctyl acrylate, 8 parts butyl acrylate, 8 parts vinylpyrrolidone, 3 parts acrylic acid, 5 parts hydroxybutyl acrylate Ester, 2 parts of vinyl triethoxy silane, 0.5 parts of ammonium persulfate, 0.8 parts of ammonia, 0.02 parts of defoamer mineral oil, 0.02 parts of wetting agent dioctyl sodium succinate, 0.7 parts of alkaline cyclopaste fine.

Preparation:

S1. Weigh 1.3 parts of anionic emulsifier allyloxynonylphenol propanol polyoxyethylene (10) ether ammonium sulfate and 0.7 parts of alkylphenol polyoxyethylene (40) ether, 50 parts of deionized water, 0.5 parts of nanometer Carbon sol, stirring at room temperature to obtain the emulsifier aqueous solution;

S2. Slowly add 0.5 parts of N-methylol acrylamide, 0.8 parts of glycidyl methacrylate, 69 parts of methyl methacrylate, 3 parts of isooctyl acrylate, 8 parts of butyl acrylate, 8 parts of vinylpyrrolidone, A mixed monomer consisting of 3 parts of acrylic acid, 5 parts of hydroxybutyl acrylate and 2 parts of vinyl triethoxy silane, stirred for 45 minutes at a stirring speed of 800 r/min to prepare pre-emulsion 1;

S3. Weigh 0.5 parts of ammonium persulfate, add 10 parts of deionized water to dissolve, and prepare the initiator aqueous solution 2;

S4. Heat 60 parts of deionized water to 80°C, add 5% pre-emulsion 1 and 5% initiator aqueous solution 2, and react for 60 minutes to prepare a seed emulsion;

S6. Add 0.8 parts of ammonia water to adjust the pH to 7.5, and finally add 0.02 parts of defoamer mineral oil, 0.02 parts of wetting agent dioctyl sodium succinate and 0.7 parts of alkaline cyclodextrin, stir for 10 minutes until the emulsion is uniform, filter After discharging, the acrylic emulsion is obtained.

Application method:

Add 330 parts of calcium carbonate and 150 parts of titanium dioxide to 300 parts of acrylic latex, add 1 part of film-forming aids, 0.46 parts of dispersant, stir, mix and disperse uniformly, use asbestos tile as the substrate for coating, the coating thickness is 150μm samples are tested.

Example 4: Aqueous acrylate emulsion and its preparation method and application method

Calculated in parts by mass, including the following components: 1.6 parts of anionic emulsifier allyloxynonylphenol propanol polyoxyethylene (10) ether ammonium sulfate, 0.6 parts of alkylphenol polyoxyethylene (40) ether, 0.4 parts Nano aluminum sol, 150 parts deionized water, 2 parts glycidyl methacrylate, 1 part diallyl phthalate, 70 parts methyl methacrylate, 9 parts butyl acrylate, 9 parts vinyl pyrrolidone, 1.5 parts of acrylic acid, 3 parts of hydroxypropyl acrylate, 1.8 parts of trimethylethoxysilane, 0.7 parts of potassium persulfate, 1.0 part of ammonia, 0.01 part of defoamer mineral oil, 0.01 part of wetting agent dioctyl succinate Sodium, 0.4 parts of alkaline cyclodextrin.

Preparation:

S1. Weigh 1.6 parts of anionic emulsifier allyloxynonylphenol propanol polyoxyethylene (10) ether ammonium sulfate and 06 parts of alkylphenol polyoxyethylene (40) ether, 50 parts of deionized water, 0.4 parts of nanometer Aluminum sol, stirring at room temperature to obtain the emulsifier aqueous solution;

S2. Slowly add 2 parts of glycidyl methacrylate, 1 part of diallyl phthalate, then 70 parts of methyl methacrylate, 9 parts of butyl acrylate, 9 parts of vinylpyrrolidone, 1.5 parts of acrylic acid, 3 parts A mixed monomer composed of parts of hydroxypropyl acrylate and 1.8 parts of trimethylethoxysilane was stirred for 45 minutes at a stirring speed of 800 r/min to prepare pre-emulsion 1.

S3. Weigh 0.7 parts of potassium persulfate, add 20 parts of deionized water to dissolve, and prepare the initiator aqueous solution 2;

S4. Heat 80 parts of deionized water to 80°C, add 5% pre-emulsion 1 and 2% initiator aqueous solution 2, and react for 60 minutes to prepare a seed emulsion;

S6. Add 1.0 part of ammonia water to adjust the pH to 7.5, and finally add 0.01 part of defoamer mineral oil, 0.01 part of wetting agent dioctyl sodium succinate and 0.4 part of alkaline cyclodextrin, stir for 10 minutes until the emulsion is uniform, filter The material is discharged, and the road marking water-based polyacrylate emulsion is obtained.

Application method:

Table 1. Test results

样品sample	耐磨性Abrasion resistance	耐水性Water resistance	耐碱性(饱和氢氧化钙溶液)Alkali resistance (saturated calcium hydroxide solution)
实施例1Example 1	54份54 copies	72h无异常72h without exception	24h无异常24h without exception
实施例2Example 2	45.3份45.3 copies	72h无异常72h without exception	24h无异常24h without exception
实施例3Example 3	52.4份52.4 copies	72h无异常72h without exception	24h无异常24h without exception
实施例4Example 4	49.8份49.8 copies	72h无异常72h without exception	24h无异常24h without exception

From the test results, the performance of Example 2 is very excellent, and the wear resistance is better than the other three groups.

Table 2. Dow emulsion test results

Comparing the test results of the sample with the Dow emulsion, it is found that the abrasion resistance is better than that of the Dow emulsion, and the water resistance is equivalent to the alkali resistance.

This specific embodiment is only an explanation of the present invention, and it is not a limitation of the present invention. After reading this specification, those skilled in the art can make modifications to this embodiment without creative contribution as needed, but as long as the rights of the present invention All requirements are protected by patent law.

Claims

An aqueous polyacrylate emulsion, which is characterized in that, calculated in parts by weight, it comprises the following components: 68-78 parts of acrylate soft monomer, 13-18 parts of acrylate hard monomer, and 2-6 parts of organic polyphosphonic acid Parts, 1-3 parts of internal crosslinking monomer, 1.3-2 parts of silane coupling agent, 2-6 parts of functional monomer, 1-2 parts of anionic emulsifier, 0.1-0.3 part of buffer, 0.5 part of non-ionic emulsifier -1 part, 0.01-0.06 parts defoamer, 0.01-0.05 parts wetting agent, 0.2-1.0 parts initiator, 90-180 parts deionized water, 0.2-5 parts pH regulator, 0.2-0.5 parts nanosol , 0.2-0.7 parts of alkaline cyclodextrin.
The aqueous polyacrylate emulsion according to claim 1, wherein the soft acrylate monomer is any one or a mixture of butyl acrylate or isooctyl acrylate.
The aqueous polyacrylate emulsion according to claim 1, wherein the acrylate hard monomer is any one or more of methyl acrylate, ethyl acrylate or methyl methacrylate or vinyl pyrrolidone mixture.
The aqueous polyacrylate emulsion according to claim 1, wherein the nano sol is any one of nano carbon sol, nano aluminum sol or nano titanium sol.
The aqueous polyacrylate emulsion according to claim 1, wherein the functional monomer is any one or more of acrylonitrile, hydroxyethyl acrylate, hydroxypropyl acrylate or hydroxybutyl acrylate mixture.
The aqueous polyacrylate emulsion of claim 1, wherein the silane coupling agent is any one of vinyltrimethoxysilane, trimethylethoxysilane, or vinyltriethoxysilane Kind.
The aqueous polyacrylate emulsion according to claim 1, wherein the anionic emulsifier is any one of nonylphenol polyoxyethylene ether ammonium sulfate or sodium alkyl alcohol polyether succinate monoester sulfonate Or a mixture of the two.
The aqueous polyacrylate emulsion of claim 1, wherein the nonionic emulsifier is alkylphenol polyoxyethylene ether.
A method for preparing an aqueous polyacrylate emulsion, which is characterized in that it comprises the following steps:

S1. Stir the anionic emulsifier, nonionic emulsifier, and deionized water to obtain the emulsifier aqueous solution;

S2. Add acrylate hard monomer, acrylate soft monomer, polar monomer, functional monomer, internal crosslinking monomer and silane coupling agent to S1, stir to prepare a pre-emulsion;

S3. Add deionized water to the initiator and stir to obtain an aqueous initiator solution;

S4. Add deionized water and buffer to the reactor and heat, and inject part of the pre-emulsion obtained by S1 and the initiator aqueous solution obtained by part of S2, and react to prepare a seed emulsion;

S5. Add the remaining S1 to the pre-emulsion solution and the remaining S2 to obtain the initiator aqueous solution at the same time dropwise into the seed emulsion, increase the temperature to 84-86°C and keep the temperature for 1 hour, and then lower the temperature;

S6. When the temperature of S5 drops below 50°C, add a pH regulator to it to adjust the pH value, then add a defoamer and a wetting agent, stir until the emulsion is uniform, and filter the material to obtain the aqueous acrylate emulsion.
An application method of water-based acrylate emulsion, which is characterized in that calcium carbonate, titanium dioxide, film-forming aids, and dispersing agents are added to the water-based acrylate emulsion to stir, mix and disperse uniformly. The surface is coated.