Modified styrene-acrylic emulsion, interior wall coating and preparation method thereof

Abstract

The invention discloses a modified styrene-acrylic emulsion, an interior wall coating and a preparation method thereof, and belongs to the technical field of building coatings. The modified styrene-acrylic emulsion comprises the following components: styrene, adamantyl methacrylate, fluorinated acrylate, an emulsifier, potassium persulfate, tert-butyl hydroperoxide, sodium bicarbonate and deionized water. Adamantyl methacrylate is used as a monomer to graft the polystyrene-acrylic emulsion under the action of an initiator and a catalyst, so that the grafting modification range of the polystyrene-acrylic emulsion is widened, and the mechanical property of the polystyrene-acrylic emulsion is improved. After the adamantyl methacrylate and the fluorine-containing acrylate are subjected to graft modification on the styrene-acrylic emulsion, the modified styrene-acrylic emulsion and the water-based benzoxazine resin are compounded for use and applied to the coating, the fireproof and flame-retardant effects are achieved, and meanwhile the storage stability, the adhesive force and the scrubbing resistance of the coating are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of building coatings, and in particular relates to a modified styrene-acrylic emulsion, an interior wall coating and a preparation method thereof. Background Art

[0002] The application of coatings in the field of construction has developed from the initial decorative function to today's increasing number of additional functions, such as mildew prevention, antibacterial, formaldehyde resistance, flame retardant and fireproof. With the development of social economy, the country's requirements for flame retardant and fireproof of buildings are getting higher and higher. Fire retardant coatings applied on the surface of substrates not only play the role of decoration and protection of substrates, but also need to be flame retardant and fireproof, delay the spread of fire in the event of a fire, and protect the safety of life and property. For this reason, my country has implemented the national mandatory standards GB 50222-2017 "Code for Fire Prevention Design of Interior Decoration of Buildings" and GB 8624-1997 "Classification Method for Combustion Performance of Building Materials", which have made strict requirements and instructions on the fire prevention requirements and grade classification of interior wall coatings. There are endless fire retardant coatings on the market, most of which achieve flame retardant and fireproof effects through inorganic composite fillers.

[0003] Inorganic composite filler flame retardant coatings thicken severely during storage, affecting construction performance. Therefore, compared with general coatings, inorganic fire retardant coatings have a short storage period, relatively more customer complaints, and increased product maintenance and management costs. On the other hand, inorganic flame retardant coatings only have a certain adhesion to cement substrates during application, and their application range is relatively narrow. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a modified styrene acrylic emulsion, interior wall paint and a preparation method thereof, wherein adamantyl methacrylate is used as a monomer to graft polystyrene acrylic emulsion under the action of an initiator, potassium persulfate, and a catalyst, tert-butyl hydroperoxide, thereby broadening the scope of graft modification of polystyrene acrylic emulsion and improving the mechanical properties of polystyrene acrylic emulsion. The present invention uses adamantyl methacrylate and a fluorine-containing acrylate to graft-modify the styrene acrylic emulsion, and then uses it in combination with a water-based benzoxazine resin and is applied to the coating, achieving a fire retardant effect while improving the storage stability, adhesion and scrub resistance of the coating.

[0005] To solve the above problems, the present invention is implemented through the following technical solutions:

[0006] The first object of the present invention is:

[0007] A modified styrene-acrylic emulsion is provided, comprising the following components in parts by weight:

[0008] 10-30 parts of styrene, 5-15 parts of adamantyl methacrylate, 5-20 parts of fluorine-containing acrylate, 1-5 parts of emulsifier, 0.1-0.5 parts of potassium persulfate, 0.1-0.5 parts of tert-butyl hydroperoxide, 0.1-1 parts of sodium bicarbonate, and 30-60 parts of deionized water.

[0009] The further optimization of the modified styrene-acrylic emulsion of the present invention is:

[0010] The adamantyl methacrylate is one or a combination of 2-methyl-2-adamantyl methacrylate, 1-adamantyl methacrylate, 2-isopropyl-2-adamantyl methacrylate, 2-ethyl-2-adamantyl methacrylate, 3-hydroxy-1-adamantyl methacrylate, 1-methyl-1-ethyl-1-adamantane methanol methacrylate. Preferably, it is one or a combination of 2-isopropyl-2-adamantyl methacrylate, 2-ethyl-2-adamantyl methacrylate, 3-hydroxy-1-adamantyl methacrylate.

[0011] The introduced adamantyl methacrylate is a large-volume rigid group, which will improve the internal structure of the polymer, improve the thermal stability of the coating, and to a certain extent improve the flame retardant properties of the styrene acrylic emulsion; after film formation, the internal voids are increased, and the covering polymer works synergistically to increase the refractive index of the coating, thereby achieving the high covering requirements of the paint film.

[0012] The further optimization of the modified styrene-acrylic emulsion of the present invention is:

[0013] The fluorine-containing acrylate is one or a combination of octafluoropentyl acrylate, dodecafluoroheptyl methacrylate, hexafluorobutyl acrylate, trifluoroethyl methacrylate, hexafluoroisopropyl methacrylate, and hexafluorobutyl methacrylate.

[0014] The further optimization of the modified styrene-acrylic emulsion of the present invention is:

[0015] The emulsifier is one or a combination of sodium dodecylbenzene sulfonate, sodium butanediylnaphthalene sulfonate, fatty acid soap, rosin acid soap, alkyl sulfonate, alkyl aryl sulfonate, alkyl sulfosuccinate, polyoxyalkylene alkyl sulfate, polyoxyalkylene aryl sulfate, stearyl trimethyl ammonium, polyoxyethylene ether stearyl alcohol, cetyl trimethyl ammonium, lauryl trimethyl ammonium, polyoxyalkylene alkyl phenyl ether, polyoxyalkylene alkyl ether, alkyl polyglucosides, polyglycerol alkyl ether, polyoxyalkylene fatty acid ester, polyglycerol fatty acid ester, sorbitan fatty acid ester. Preferably, the emulsifier is one or a combination of sodium dodecylbenzene sulfonate, sodium butanediylnaphthalene sulfonate, polyoxyethylene ether stearyl alcohol, polyoxyalkylene alkyl phenyl ether, polyoxyalkylene fatty acid ester, alkyl polyglucosides.

[0016] Sulfonates are anionic emulsifiers with strong emulsifying ability, high water solubility and wide application range. They can be used under alkaline conditions as well as acidic conditions, and the resulting emulsions are relatively stable to both acids and metal ions. Nonionic emulsifiers stabilize latex particles by adsorption and protection. Anionic emulsifiers and nonionic emulsifiers are used together to complement each other. When the two are used in combination, the two types of emulsifier molecules are alternately adsorbed on the surface of latex particles, that is, the nonionic type is embedded in the ionic type, resulting in a certain steric hindrance, increasing the distance between emulsifier ions, reducing the electrostatic repulsion between adjacent emulsifier ions on the same latex particle, and increasing the adsorption strength of the anionic emulsifier on the latex particle. On the other hand, ionic emulsifiers can be regarded as electrolytes. The hydrophilic groups on the nonionic emulsifiers and H 2 O and H 3 O + It carries a positive charge through hydrogen bonding, and electrostatic interaction occurs between ions, which reduces the repulsion between hydrophilic groups and increases the emulsifying ability.

[0017] The second object of the present invention is:

[0018] Provided is a method for preparing the modified styrene-acrylic emulsion described above, comprising the following preparation steps:

[0019] S1. Add deionized water to the reactor in proportion, and then add styrene, adamantyl methacrylate, and fluorinated acrylate, respectively, and start stirring;

[0020] S2. Then add one-fifth of the emulsifier, potassium persulfate, and one-quarter of sodium bicarbonate into the reactor, raise the temperature to 80°C, and keep warm for 15 minutes after the blue light appears to form a seed emulsion;

[0021] S3. Slowly add the remaining emulsifier, the remaining sodium bicarbonate and tert-butyl hydroperoxide into the reactor, heat to 85°C and keep warm for 2h, cool down and filter to prepare the modified styrene-acrylic emulsion.

[0022] The third invention object of the present invention is:

[0023] Provided is a modified styrene-acrylic emulsion interior wall paint, comprising the following components in parts by weight:

[0024] 10-20 parts of the modified styrene-acrylic emulsion mentioned above, 5-10 parts of water-based benzoxazine resin, 15-27 parts of covering polymer, 5-9 parts of functional powder, 5-10 parts of calcined kaolin, 5-10 parts of heavy calcium carbonate, 20-35 parts of deionized water, 0.2-0.7 parts of hydroxyethyl cellulose, 0.2-0.5 parts of thickener, 1.0-3.0 parts of wetting and dispersing agent, and 1.0-4.0 parts of film-forming aid.

[0025] The modified styrene acrylic emulsion interior wall paint of the present invention is further optimized as follows:

[0026] The covering polymer is a water-based pure acrylic emulsion with a core-shell structure, a refractive index of 1.5-1.8, and an emulsion particle size of 350nm-450nm. By controlling the particle size of the shell, the covering ability is provided; in addition, because the core and the shell have different refractive indices for light, the light scattering performance is increased, thereby improving the covering performance of the polymer.

[0027] The modified styrene acrylic emulsion interior wall paint of the present invention is further optimized as follows:

[0028] The functional powder material comprises bamboo charcoal powder, bentonite and diatomaceous earth, and the bamboo charcoal powder, bentonite and diatomaceous earth account for 5% to 9% of the total weight of the functional powder material.

[0029] The modified styrene acrylic emulsion interior wall paint of the present invention is further optimized as follows:

[0030] The wetting and dispersing agent is one or a combination of perfluoro-n-propyl vinyl ether, perfluorocyclic ether, perfluorobutyl methyl ether, perfluorohexylethanol polyoxyethylene ether, perfluoroalkylethanol polyoxyethylene ether, perfluorobutyltetrahydrofuran, polyperfluoromethyl isopropyl ether, perfluoroethyl vinyl ether, and perfluoropolyether alcohol. Preferably, it is one or a combination of perfluoro-n-propyl vinyl ether, polyperfluoromethyl isopropyl ether, perfluoroethyl vinyl ether, and perfluoroalkylethanol polyoxyethylene ether.

[0031] Perfluoroalkyl dispersants have a high electronegativity, and fluorine atoms have a greater attraction to electrons, which makes the electron density outside the nucleus larger and the atomic radius smaller. Since the electrons are adsorbed more tightly, it is difficult for the emulsion particles to shift among the various powders in the coating, reducing the risk of agglomeration of the emulsion during the application process; in addition, due to the tight adsorption of electrons, the adhesion to the substrate is improved when used in the coating. At the same time, perfluoro compounds have a low surface tension, which can regulate the risk of demulsification of polystyrene acrylic emulsions during production and application due to high-speed dispersion shearing, and will not cause demulsification and flocculation problems during long-term storage in extremely cold weather.

[0032] The modified styrene acrylic emulsion interior wall paint of the present invention is further optimized as follows:

[0033] The hydroxyethyl cellulose is one or a combination of methyl hydroxyethyl cellulose, ethyl hydroxyethyl cellulose, hexadecyl hydroxyethyl cellulose, hexadecyloxy-2-hydroxypropyl hydroxyethyl cellulose, butoxy-2-hydroxypropyl hydroxyethyl cellulose, butoxy-2-hydroxypropyl hexadecyl hydroxyethyl cellulose, butoxy-2-hydroxypropyl hexadecyloxy-2-hydroxyethyl cellulose, carboxymethyl hydroxyethyl cellulose, sulfoethyl hexadecyloxy-2-hydroxypropyl cellulose, 2-hydroxypropyltrimethylammonium chloride hydroxyethyl cellulose, 2-hydroxypropyltrimethylammonium chloride hexadecyl hydroxyethyl cellulose, 2-hydroxypropyltrimethylammonium chloride hexadecyl hydroxyethyl cellulose, 2-hydroxypropyllauryldimethylammonium chloride hydroxyethyl cellulose, 2-hydroxypropyltrimethylammonium chloride 2-hydroxypropyllauryldimethylammonium chloride hydroxyethyl cellulose, diallyldimethylammonium chloride hydroxyethyl cellulose graft copolymer, and diallyldimethylammonium chloride hexadecyl hydroxyethyl cellulose. Preferably, the hydroxyethyl cellulose is one or a combination of methyl hydroxyethyl cellulose, sulfoethyl hexadecyloxy-2-hydroxypropyl cellulose, hexadecyl hydroxyethyl cellulose, and hexadecyloxy-2-hydroxypropyl hydroxyethyl cellulose.

[0034] By introducing hydroxyethyl cellulose as a thickener for the coating, the viscosity of the system is increased, the dispersion efficiency of the powder is improved, the production efficiency is improved during the production process, the stratification of the coating is reduced during the storage of the coating, and the self-leveling of the coating is helped during the application process.

[0035] The modified styrene acrylic emulsion interior wall paint of the present invention is further optimized as follows:

[0036] The film-forming aid is one or a combination of diisobutyl adipate, diisobutyl glutarate, diisobutyl succinate, 2,2,4-trimethyl-1,2-pentanediol isobutyl monoester, propylene glycol phenyl ether, ethylene glycol butyl ether, propylene glycol phenyl ether, dipropylene glycol monomethyl ether, propylene glycol diacetate, diisopropyl adipate, hexanediol butyl ether acetate, dodecyl alcohol ester, hexadecanol ester, and 3-ethoxyethyl propionate.

[0037] The modified styrene acrylic emulsion interior wall paint of the present invention is further optimized as follows:

[0038] The thickener is one or a combination of polyurethane thickener, sodium polyacrylate, polyacrylamide, polyvinyl pyrrolidone, polyethylene oxide, carbopol resin and polyacrylic acid.

[0039] The fourth invention objective of the present invention is:

[0040] Provided is a method for preparing the modified styrene acrylic emulsion interior wall paint described above, comprising the following preparation steps:

[0041] s1. Under stirring conditions at a speed of 300 to 400 rpm, the aqueous benzoxazine resin and the modified styrene-acrylic emulsion were mixed according to the formula ratio to obtain a composite emulsion;

[0042] s2. Add hydroxyethyl cellulose and wetting dispersant to deionized water and disperse for 5 to 10 minutes under stirring at a speed of 500 to 800 rpm;

[0043] s3. Add functional powder, calcined kaolin, heavy calcium carbonate, and stir and disperse at a stirring speed of 1000 to 1300 rpm for 10 to 15 min;

[0044] s4. Adjust the rotation speed to 600-900 rpm, add the composite emulsion obtained in step s1, the covering polymer, the thickener, and the film-forming aid, and disperse for 5-10 minutes to prepare the modified styrene-acrylic emulsion interior wall paint.

[0045] The beneficial effects of the present invention are:

[0046] (1) Using adamantyl methacrylate and fluorinated acrylate as monomers, polystyrene acrylic emulsion was polymerized in the presence of an initiator and a catalyst, thereby improving the mechanical properties of the polystyrene acrylic emulsion. When applied to coatings, the scrub resistance of the coatings was improved.

[0047] (2) By compounding water-based benzoxazine resin and modified styrene acrylic emulsion, on the one hand, the flame retardant and fireproofing effect of interior wall coatings is improved; on the other hand, by compounding water-based benzoxazine resin and modified styrene acrylic emulsion and applying them in interior wall coatings, the problems of short storage period and severe thickening in the later stage of flame retardant and fireproof coatings are solved.

[0048] (3) The core-shell structured pure acrylic emulsion is used as a covering material, which has good compatibility with the system and avoids the shortcomings of poor dispersion and easy agglomeration of rutile titanium dioxide in the coating system. During the core-shell polymerization process, the shell polymerization reaction is carried out on the core surface, and the hydrophilic center is filled with water molecules. When drying, the water evaporates and the remaining cavity is filled with air. Due to the difference in the refractive index of light in the two media, opacity is generated. The refractive property of the surface of the polymer hollow emulsion to light makes it have strong opacity-covering property, providing the coating with covering performance, and utilizing the refractive property of the surface of the polymer hollow emulsion to light to make it have strong opacity.

[0049] (4) Perfluoroalkyl dispersants have a high electronegativity, and fluorine atoms have a greater attraction to electrons, which makes the electron density outside the composite styrene-acrylic emulsion particles larger, thus preventing the composite styrene-acrylic emulsion particles from being squeezed and demulsified during the storage of the coating. Therefore, fluoroalkyl dispersants improve the storage stability and freeze-thaw stability of the coating, and improve the adhesion between the coating and the substrate. DETAILED DESCRIPTION

[0050] In order to make the application, technical scheme and advantages of the present invention more clear, the present invention is described in detail in conjunction with specific embodiments. It should be understood that the embodiments are only used to illustrate the present invention, but not to limit the protection scope of the present invention. All simple improvements to the preparation method of the present invention under the premise of the concept of the present invention belong to the protection scope of the present invention.

[0051] Example 1 Preparation method of modified styrene-acrylic emulsion

[0052] A modified styrene-acrylic emulsion comprising the following components in parts by weight:

[0053] 20 parts of styrene, 8 parts of 3-hydroxy-1-adamantyl methacrylate, 17 parts of dodecafluoroheptyl methacrylate, 2 parts of polyoxyalkylene fatty acid ester, 0.2 parts of potassium persulfate, 0.3 parts of tert-butyl hydroperoxide, 0.5 parts of sodium bicarbonate, and 52 parts of deionized water.

[0054] The preparation method of the modified styrene-acrylic emulsion described above comprises the following preparation steps:

[0055] S1. Add deionized water to the reactor in proportion, add styrene, 3-hydroxy-1-adamantyl methacrylate, and dodecafluoroheptyl methacrylate, respectively, and start stirring;

[0056] S2. Then add one-fifth of polyoxyalkylene fatty acid ester, potassium persulfate, and one-quarter of sodium bicarbonate to the reactor, raise the temperature to 80°C, and keep warm for 15 minutes after the blue light appears to form a seed emulsion;

[0057] S3. Slowly add the remaining polyoxyalkylene fatty acid ester, the remaining sodium bicarbonate and tert-butyl hydroperoxide into the reactor, heat to 85°C and keep warm for 2h, cool down and filter to prepare a modified styrene-acrylic emulsion.

[0058] Example 2 Preparation method of a modified styrene acrylic emulsion interior wall coating

[0059] A modified styrene-acrylic emulsion interior wall paint comprises the following components in parts by weight:

[0060] 10-20 parts of the modified styrene-acrylic emulsion prepared in Example 1, 5-10 parts of an aqueous benzoxazine resin, 15-27 parts of a covering polymer, 5-9 parts of a functional powder, 5-10 parts of calcined kaolin, 5-10 parts of heavy calcium carbonate, 20-35 parts of deionized water, 0.2-0.7 parts of hydroxyethyl cellulose, 0.2-0.5 parts of a thickener, 1.0-3.0 parts of a perfluoroethyl vinyl ether wetting and dispersing agent, and 1.0-4.0 parts of a film-forming aid.

[0061] The preparation method of the modified styrene acrylic emulsion interior wall paint described above comprises the following preparation steps:

[0062] s1. Under stirring conditions at a speed of 300 to 400 rpm, the aqueous benzoxazine resin and the modified styrene-acrylic emulsion were mixed according to the formula ratio to obtain a composite emulsion;

[0063] s2. Add hydroxyethyl cellulose and dispersant perfluoroethyl vinyl ether to deionized water under stirring at a speed of 500 to 800 rpm and disperse for 5 to 10 minutes;

[0064] s3. Add functional powder, calcined kaolin, heavy calcium carbonate, and stir and disperse at a stirring speed of 1000 to 1300 rpm for 10 to 15 min;

[0065] s4. Adjust the rotation speed to 600-900 rpm, add the composite emulsion obtained in step s1, the covering polymer, the polyurethane thickener, and the film-forming aid, and disperse for 5-10 minutes to prepare the modified styrene-acrylic emulsion interior wall paint.

[0066] The covering polymer used in Example 2 is Lepakol from Dow TM (ROPAQUE TM )U-Chuang-E covering polymer.

[0067] The preparation steps of the comparative experimental group are basically the same as those of Example 2, with the main difference being the composition of the raw materials, as shown in Table 1 for details.

[0068] Table 1 Raw material ratios of each experimental group in Example 2 and Comparative Example (parts by weight)

[0069]

[0070] The interior wall coating of the modified styrene acrylic emulsion interior wall coating prepared in Example 2 and the coating composition prepared in the comparative example were prepared according to GB / T 9756-2018 synthetic resin emulsion interior wall coating, GB 8624-2012 Classification of combustion performance of building materials and products, and GB / T 20285-2006 Classification of smoke toxicity hazards of materials. The results are shown in Table 1.

[0071] Table 2 Test results of each experimental group in Example 2 and Comparative Example

[0072]

[0073] According to the above test results, the performance of Example 2 and Comparative Example 1# are both good, and the fire retardant performance can reach A1 level flame retardant effect compared with ordinary interior wall coatings. The difference between Example 2 and Comparative Example 1# is that Example 2 uses a covering polymer, and Comparative Example 1# uses rutile titanium dioxide. In practical applications, the covering polymer has better compatibility with the system, avoiding the shortcomings of poor dispersion performance and easy agglomeration of rutile titanium dioxide in the coating system.

[0074] Comparative Example 2# increases the amount of water-based benzoxazine resin to 15 parts. Due to the limitation of the solubility of water-based benzoxazine resin in water, stratification occurs during storage, and the flame retardant effect and scrub resistance of the paint film also decrease. Example 2 controls the amount of water-based benzoxazine resin to 5-10 parts, balances the limitation of the solubility of water-based benzoxazine resin in water, and achieves the optimal state of storage stability, flame retardant effect and scrub resistance of latex paint.

[0075] Comparative Example 3# uses unmodified styrene acrylic emulsion, and Comparative Example 4# uses modified styrene acrylic emulsion on the market. The difference between the two comparative examples and Example 2 is that the modified styrene acrylic emulsion of Example 1 is not used. The various properties of Comparative Examples 3# and Comparative Examples 4# during storage and application are not as good as those of Example 2. Example 2 uses the modified styrene acrylic emulsion of Example 1, which is modified by grafting with adamantyl methacrylate and fluorinated acrylate, and synergistically acts with water-based benzoxazine resin and covering polymer to solve the stratification and post-thickening problems during storage, and also improve the contrast ratio, flame retardant effect and scrub resistance of the paint film.

[0076] In addition, compared with inorganic flame retardant coatings, the present invention solves the problem of post-thickening, and compared with ordinary interior wall coatings, the viscosity change after heat storage is very small. In addition, the process provided by the present invention is similar to that of ordinary interior wall coatings, and the production cost does not increase.

[0077] To sum up, the above are only preferred embodiments of the present invention and are not intended to limit the present invention in any form. Any equivalent changes, modifications and evolutions made by technicians familiar with the profession without departing from the scope of the technical solution of the present invention using the disclosed technical content are regarded as equivalent embodiments of the present invention. At the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the present invention are still within the protection scope of the technical solution of the present invention.

[0078] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0079] The experimental methods without specific conditions in the present invention are usually carried out under conventional conditions or conditions recommended by the manufacturer.

[0080] Unless otherwise stated, the various optimization technical solutions in the present invention can be combined with each other.

[0081] Unless otherwise indicated, percentages and parts are by weight.

[0082] Experimental methods without specific conditions specified in the instructions and examples are usually carried out under conventional conditions or conditions recommended by the manufacturers.

[0083] Unless otherwise defined, all professional and scientific terms used herein have the same meaning as those familiar to those skilled in the art. In addition, any method and material similar or equivalent to the described content can be applied to the method of the present invention.

Claims

1. A modified styrene acrylic emulsion, Features: It includes the following components by weight: 10-30 parts of styrene, 5-15 parts of adamantyl methacrylate, 5-20 parts of fluorine-containing acrylate, 1-5 parts of emulsifier, 0.1-0.5 parts of potassium persulfate, 0.1-0.5 parts of tert-butyl hydroperoxide, 0.1-1 parts of sodium bicarbonate, and 30-60 parts of deionized water.

2. The modified styrene-acrylic emulsion according to claim 1, Features: The adamantyl methacrylate is one or a combination of 2-methyl-2-adamantyl methacrylate, 1-adamantyl methacrylate, 2-isopropyl-2-adamantyl methacrylate, 2-ethyl-2-adamantyl methacrylate, 3-hydroxy-1-adamantyl methacrylate, 1-methyl-1-ethyl-1-adamantane methanol methacrylate; and / or The fluorine-containing acrylate is one or a combination of octafluoropentyl acrylate, dodecafluoroheptyl methacrylate, hexafluorobutyl acrylate, trifluoroethyl methacrylate, hexafluoroisopropyl methacrylate, and hexafluorobutyl methacrylate; The emulsifier is one or a combination of the following: sodium dodecylbenzene sulfonate, sodium butanediylnaphthalene sulfonate, fatty acid soap, rosin acid soap, alkyl sulfonate, alkyl aryl sulfonate, alkyl sulfosuccinate, polyoxyalkylene alkyl sulfate, polyoxyalkylene aryl sulfate, stearyl trimethyl ammonium, polyoxyethylene ether stearyl alcohol, cetyl trimethyl ammonium, lauryl trimethyl ammonium, polyoxyalkylene alkyl phenyl ether, polyoxyalkylene alkyl ether, alkyl polyglucoside, polyglycerol alkyl ether, polyoxyalkylene fatty acid ester, polyglycerol fatty acid ester, and sorbitan fatty acid ester.

3. A method for preparing the modified styrene-acrylic emulsion according to claim 1, Features: It comprises the following preparation steps: S1. Add deionized water to the reactor in proportion, add styrene, adamantyl methacrylate, and fluorinated acrylate, respectively, and start stirring; S2. Then add one-fifth of the emulsifier, potassium persulfate, and one-quarter of sodium bicarbonate into the reactor, raise the temperature to 80°C, and keep warm for 15 minutes after the blue light appears to form a seed emulsion; S3. Slowly add the remaining emulsifier, the remaining sodium bicarbonate and tert-butyl hydroperoxide into the reactor, heat to 85°C and keep warm for 2h, cool down and filter to prepare the modified styrene-acrylic emulsion.

4. A modified styrene acrylic emulsion interior wall paint, Features ： It includes the following components by weight: 10-20 parts of the modified styrene-acrylic emulsion according to claim 1, 5-10 parts of water-based benzoxazine resin, 15-27 parts of covering polymer, 5-9 parts of functional powder, 5-10 parts of calcined kaolin, 5-10 parts of heavy calcium carbonate, 20-35 parts of deionized water, 0.2-0.7 parts of hydroxyethyl cellulose, 0.2-0.5 parts of thickener, 1.0-3.0 parts of wetting and dispersing agent, and 1.0-4.0 parts of film-forming aid.

5. The modified styrene acrylic emulsion interior wall paint according to claim 4, Features: The covering polymer is a water-based pure acrylic emulsion with a core-shell structure, a refractive index of 1.5-1.8, and an emulsion particle size of 350nm-450nm.

6. The modified styrene acrylic emulsion interior wall paint according to claim 4, Features: The functional powder material comprises bamboo charcoal powder, bentonite and diatomaceous earth, and the bamboo charcoal powder, bentonite and diatomaceous earth account for 5% to 9% of the total weight of the functional powder material.

7. The modified styrene acrylic emulsion interior wall paint according to claim 4, Features: The wetting and dispersing agent is one or a combination of perfluoro n-propyl vinyl ether, perfluorocyclic ether, perfluorobutyl methyl ether, perfluorohexylethanol polyoxyethylene ether, perfluoroalkylethanol polyoxyethylene ether, perfluorobutyltetrahydrofuran, polyperfluoromethyl isopropyl ether, perfluoroethyl vinyl ether, and perfluoropolyether alcohol; and / or The hydroxyethyl cellulose is one or a combination of methyl hydroxyethyl cellulose, ethyl hydroxyethyl cellulose, hexadecyl hydroxyethyl cellulose, hexadecyloxy-2-hydroxypropyl hydroxyethyl cellulose, butoxy-2-hydroxypropyl hydroxyethyl cellulose, butoxy-2-hydroxypropyl hexadecyl hydroxyethyl cellulose, butoxy-2-hydroxypropyl hexadecyloxy-2-hydroxyethyl cellulose, carboxymethyl hydroxyethyl cellulose, sulfoethyl hexadecyloxy-2-hydroxypropyl cellulose, 2-hydroxypropyltrimethylammonium chloride hydroxyethyl cellulose, 2-hydroxypropyltrimethylammonium chloride hexadecyl hydroxyethyl cellulose, 2-hydroxypropyltrimethylammonium chloride hexadecyl hydroxyethyl cellulose, 2-hydroxypropyllauryldimethylammonium chloride hydroxyethyl cellulose, 2-hydroxypropyltrimethylammonium chloride 2-hydroxypropyllauryldimethylammonium chloride hydroxyethyl cellulose, diallyldimethylammonium chloride hydroxyethyl cellulose graft copolymer, and diallyldimethylammonium chloride hexadecyl hydroxyethyl cellulose; and / or The film-forming aid is one or a combination of diisobutyl adipate, diisobutyl glutarate, diisobutyl succinate, 2,2,4-trimethyl-1,2-pentanediol isobutyl monoester, propylene glycol phenyl ether, ethylene glycol butyl ether, propylene glycol phenyl ether, dipropylene glycol monomethyl ether, propylene glycol diacetate, diisopropyl adipate, hexanediol butyl ether acetate, dodecyl alcohol ester, hexadecanol ester, and ethyl 3-ethoxypropionate; and / or The thickener is one or a combination of polyurethane thickener, sodium polyacrylate, polyacrylamide, polyvinyl pyrrolidone, polyethylene oxide, carbopol resin and polyacrylic acid.

8. A method for preparing the modified styrene acrylic emulsion interior wall paint according to claim 4, Features: It comprises the following preparation steps: s1. Under stirring conditions at a speed of 300 to 400 rpm, the aqueous benzoxazine resin and the modified styrene-acrylic emulsion were mixed according to the formula ratio to obtain a composite emulsion; s2. Add hydroxyethyl cellulose and wetting dispersant to deionized water under stirring at a speed of 500 to 800 rpm and disperse for 5 to 10 minutes; s3. Add functional powder, calcined kaolin, heavy calcium carbonate, and stir and disperse at a stirring speed of 1000 to 1300 rpm for 10 to 15 min; s4. Adjust the rotation speed to 600-900 rpm, add the composite emulsion obtained in step s1, the covering polymer, the thickener, and the film-forming aid, and disperse for 5-10 minutes to prepare the modified styrene-acrylic emulsion interior wall paint.

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