Water-based fluorine-containing hydroxyl acrylic dispersion, preparation method thereof and coating

Abstract

The invention provides a water-based fluorine-containing hydroxyl acrylic dispersion, a preparation method thereof and a coating. The method comprises the following steps: (1) mixing a first mixed monomer with a solvent for reaction to obtain a first reactant; (2) mixing and reacting a second mixed monomer with the first reactant to obtain a second reactant; (3) neutralizing the second reactant, and dispersing the neutralized second reactant in water; the first mixed monomer is prepared from 50 to 80 parts of styrene, 40 to 80 parts of hydroxyl-containing monomer, 0 to 30 parts of carboxyl-containing monomer, 50 to 100 parts of alkyl acrylate, 0 to 20 parts of vinyl versatate monomer, 10 to 20 parts of fluorine-containing acrylate monomer, 0 to 20 parts of isobornyl methacrylate and 5 to 10 parts of initiator; the second mixed monomer comprises 0-30 parts of a hydroxyl-containing monomer, 10-330 parts of a carboxyl-containing monomer, 50-100 parts of alkyl acrylate, 0-6 parts of a fluorine-containing acrylate monomer, 0-20 parts of isobornyl methacrylate and 2-3 parts of an initiator. The aqueous fluorine-containing hydroxy acrylic dispersion prepared by the method has low viscosity under high solid content, and the prepared coating has a long construction period.

Description

Technical Field

[0001] The invention relates to the technical field of water-based coatings, and in particular to a water-based fluorine-containing hydroxyl acrylic dispersion and a preparation method and coating thereof. Background Art

[0002] Waterborne hydroxy acrylic dispersions have made great progress in the field of industrial coatings in recent years. Acrylic dispersions are synthesized entirely using the hydrophilicity of the carboxyl group in acrylic monomers, without the need to add emulsifiers, with small particle size, high hydroxyl content, and low viscosity. The waterborne two-component coating obtained by cross-linking and curing by using the hydroxyl group (-OH) in acrylic dispersions and the isocyanate group (-NCO) in polyisocyanate to generate isocyanate has high fullness, high hardness, good water resistance, low VOC, good weather resistance, good acid and alkali resistance and other excellent properties after film formation. Therefore, it is widely used in wood paint, metal paint, plastic paint and other industries.

[0003] However, the high-solid hydroxyl acrylic dispersion commonly used in China has high viscosity, the formulated coating has a short construction period, and its aging resistance needs to be improved in high-corrosion environments. Summary of the invention

[0004] The present invention aims to solve one of the technical problems in the prior art at least to a certain extent. To this end, one object of the present invention is to provide an aqueous fluorinated hydroxyl acrylic dispersion and a preparation method and coating thereof.

[0005] In a first aspect of the present invention, the present invention provides a method for preparing an aqueous fluorinated hydroxyl acrylic dispersion, the method comprising: (1) mixing a first mixed monomer and a solvent to react to obtain a first reactant; (2) mixing a second mixed monomer with the first reactant to react to obtain a second reactant; (3) neutralizing the second reactant and dispersing it in water; In parts by weight, the first mixed monomer includes 50-80 parts of styrene, 40-80 parts of hydroxyl-containing monomers, 0-30 parts of carboxyl-containing monomers, 50-100 parts of alkyl acrylates, 0-20 parts of versatate vinyl ester monomers, 10-20 parts of fluorine-containing acrylate monomers, 0-20 parts of isobornyl methacrylate, and 5-10 parts of initiators; In parts by weight, the second mixed monomer includes 0-30 parts of hydroxyl-containing monomer, 10-330 parts of carboxyl-containing monomer, 50-100 parts of alkyl acrylate, 0-6 parts of fluorine-containing acrylate monomer, 0-20 parts of isobornyl methacrylate, and 2-3 parts of initiator.

[0006] According to the preparation method of the above-mentioned aqueous fluorinated hydroxy acrylic dispersion of the present invention, first, a first mixed monomer is mixed with a solvent to react to obtain a first reactant, and then a second mixed monomer is mixed with the above-mentioned first reactant to react to obtain a second reactant. By optimizing the components of the first mixed monomer and the second mixed monomer and the mass proportion of each component, on the one hand, a special core-shell structure of aqueous fluorinated hydroxy acrylic can be formed, thereby effectively reducing the viscosity of the aqueous fluorinated hydroxy acrylic dispersion at a high solid content. On the other hand, the service life of the coating formed by the aqueous fluorinated hydroxy acrylic dispersion and polyisocyanate can be extended, that is, the coating can be kept from solidifying for a long time, thereby extending the construction period. Furthermore, during the polymerization of the monomers, high steric hindrance monomers (tert-butyl vinyl carbonate monomers, isobornyl methacrylate) are introduced to effectively reduce the viscosity without changing the solid content. At the same time, fluorinated acrylic ester monomers are introduced. By introducing fluorinated monomers during the polymerization of the monomers, since the CF bond energy in the fluorinated monomers is very large, the introduction of fluorinated monomers will cause the fluorine atoms in the hydroxy acrylic dispersion to undergo molecular rearrangement during film formation, which can reduce the surface energy of the hydroxy acrylic dispersion and make it have excellent water resistance. To a certain extent, it can increase the solid content of the acrylic dispersion and reduce its viscosity, significantly improving the hydrophobicity, stain resistance and weather resistance of the coating. Therefore, the aqueous fluorinated hydroxy acrylic dispersion prepared by this method has a lower viscosity at a high solid content, and the coating formed by the aqueous fluorinated hydroxy acrylic dispersion has a long construction period, and the formed coating has excellent corrosion resistance, aging resistance and water resistance.

[0007] Preferably, the first mixed monomer includes 55-70 parts of styrene, 55-75 parts of hydroxyl-containing monomers, 0-30 parts of carboxyl-containing monomers, 60-100 parts of alkyl acrylates, 10-20 parts of versatate vinyl ester monomers, 5-15 parts of isobornyl methacrylate, 10-20 parts of fluorine-containing acrylate monomers, and 5-10 parts of initiator.

[0008] Preferably, the second mixed monomer comprises 20-30 parts of hydroxyl-containing monomer, 20-50 parts of carboxyl-containing monomer, 50-90 parts of alkyl acrylate, 3-6 parts of fluorine-containing acrylate monomer, 5-15 parts of isobornyl methacrylate, and 2-3 parts of initiator.

[0009] According to the method for preparing the aqueous fluorine-containing hydroxyl acrylic dispersion of the present invention, the hydroxyl-containing monomer includes at least one of hydroxyethyl acrylate, hydroxyethyl methacrylate and hydroxypropyl acrylate.

[0010] According to the method for preparing the aqueous fluorinated hydroxy acrylic dispersion of the present invention, the carboxyl group-containing monomer comprises at least one of acrylic acid and methacrylic acid.

[0011] According to the method for preparing the aqueous fluorinated hydroxy acrylic dispersion of the present invention, the alkyl acrylate includes at least one of methyl acrylate, methyl methacrylate, ethyl acrylate, butyl acrylate and isooctyl acrylate.

[0012] According to the method for preparing the aqueous fluorine-containing hydroxyl acrylic dispersion of the present invention, the versatile vinyl carbonate monomer includes versatile vinyl carbonate.

[0013] According to the method for preparing the aqueous fluorinated hydroxy acrylic dispersion of the present invention, the fluorinated acrylic ester monomer includes at least one of trifluoroethyl methacrylate, hexafluorobutyl methacrylate, hexafluorobutyl acrylate, hexafluoroisopropyl methacrylate, and dodecafluoroheptyl methacrylate.

[0014] According to the preparation method of the above-mentioned aqueous fluorinated hydroxy acrylic dispersion of the present invention, the initiator includes at least one of tert-butyl perbenzoate, di-tert-butyl peroxide, di-tert-amyl peroxide, diisopropylbenzene peroxide, 3,3-bis(tert-butyl peroxy)ethyl butyrate, 3,3-bis(tert-amyl peroxy)butyl acetate, and diisopropylbenzene peroxide. Preferably, the initiator is tert-butyl perbenzoate and di-tert-amyl peroxide, which can significantly reduce the reaction time, reduce branching, and maintain the integrity of the polymer main chain, thereby further improving the weather resistance of the formed coating.

[0015] According to the preparation method of the above-mentioned aqueous fluorinated hydroxy acrylic dispersion of the present invention, the solvent includes at least one of tert-butyl carbonate, dipropylene glycol butyl ether, ethylene glycol monobutyl ether, propylene glycol methyl ether, diethylene glycol monobutyl ether, propylene glycol butyl ether, dipropylene glycol methyl ether, and propylene glycol diacetate.

[0016] According to the method for preparing the aqueous fluorinated hydroxy acrylic dispersion of the present invention, in step (1), the reaction temperature is 120°C to 160°C. For example, the temperature is 120°C, 130°C, 140°C, 150°C, 160°C.

[0017] According to the method for preparing the aqueous fluorinated hydroxy acrylic dispersion of the present invention, in step (2), the reaction temperature is 120°C to 160°C. For example, the temperature is 120°C, 130°C, 140°C, 150°C, 160°C.

[0018] According to the method for preparing the aqueous fluorinated hydroxy acrylic dispersion of the present invention, in step (3), the neutralizing agent used for the neutralization is 10 to 20 parts by weight.

[0019] Preferably, the neutralizing agent includes at least one of N,N-dimethylethanolamine, triethanolamine and triethylamine.

[0020] According to the method for preparing the aqueous fluorinated hydroxy acrylic dispersion of the present invention, in step (3), the water is 450-500 parts by weight.

[0021] In a second aspect of the present invention, the present invention provides an aqueous fluorinated hydroxy acrylic dispersion, which is prepared by the above method. The aqueous fluorinated hydroxy acrylic dispersion has a low viscosity at a high solid content, and the coating formed by using the aqueous fluorinated hydroxy acrylic dispersion has a long service life, and the formed coating has excellent corrosion resistance, aging resistance and water resistance.

[0022] In a second aspect of the present invention, the present invention provides a coating. The coating comprises the above-mentioned aqueous fluorinated hydroxyl acrylic dispersion. The coating has a long service life, and the formed coating has excellent corrosion resistance, aging resistance and water resistance.

[0023] As an example, the coating includes a waterborne fluorohydroxy acrylic dispersion and a polyisocyanate.

[0024] The present invention has at least the following technical effects: The aqueous fluorinated hydroxyl acrylic dispersion prepared by the method of the present invention has the advantages of high solid content, high hydroxyl content, high hardness, low viscosity, low VOC, excellent weather resistance, high fullness, etc., and has broad market development prospects. DETAILED DESCRIPTION

[0025] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention. The present invention is described below with reference to specific embodiments. It should be noted that these embodiments are merely illustrative and do not limit the present invention in any way.

[0026] Example 1 The constituent raw materials of the aqueous fluorinated hydroxyl acrylic dispersion of this embodiment are as follows:

[0027] The preparation process of the aqueous fluorinated hydroxyl acrylic dispersion of this embodiment is as follows: (1) Primer solvent: Add tert-butyl carbonate, ethylene glycol monobutyl ether and dipropylene glycol butyl ether into a four-mouth reactor equipped with a stirring device, condensation reflux device, thermometer and monomer drop-adding device, start stirring and heat to 130°C.

[0028] (2) Preparation of stage I mixed monomers: The stage I monomers and initiators tert-butyl perbenzoate and di-tert-amyl peroxide are stirred and mixed uniformly to obtain stage I mixed monomers.

[0029] (3) Reaction of mixed monomers in stage I: The reaction temperature is 130°C. Use a metering pump to dropwise add mixed monomers in stage I into the reactor. The addition is completed within 1.5 hours. After the addition of mixed monomers in stage I is completed, continue to keep the temperature at 130°C for 0.5 hours.

[0030] (4) Preparation of stage II mixed monomer: The stage II monomer and initiators tert-butyl perbenzoate and di-tert-amyl peroxide are stirred and mixed uniformly to obtain stage II mixed monomer.

[0031] (5) Reaction of mixed monomers in stage II: The reaction temperature is 130°C. Use a metering pump to drip mixed monomers in stage II into the reactor. The dripping is completed within 0.5 h. After the dripping of mixed monomers in stage II is completed, continue to keep the temperature at 130°C for 0.5 h. Additional initiator can be added after the reaction of mixed monomers in stage II is completed to allow the reaction monomers to react further.

[0032] (6) Neutralization to form salt: The product obtained from the mixed monomer reaction in step II is cooled to 110°C, and a neutralizing agent, N,N-dimethylethanolamine, is added and stirred for 30 minutes.

[0033] (7) High-speed dispersion: The above system is further cooled to below 90°C, and deionized water is added dropwise using a metering pump for high-speed dispersion to obtain an aqueous fluorinated hydroxy acrylic dispersion.

[0034] Example 2 The constituent raw materials of the aqueous fluorinated hydroxyl acrylic dispersion of this embodiment are as follows:

[0035] The preparation process of the aqueous fluorinated hydroxyl acrylic dispersion of this embodiment is the same as that of embodiment 1.

[0036] Example 3 The constituent raw materials of the aqueous fluorinated hydroxyl acrylic dispersion of this embodiment are as follows:

[0037] The preparation process of the aqueous fluorinated hydroxyl acrylic dispersion of this embodiment is the same as that of embodiment 1.

[0038] Example 4 The constituent raw materials of the aqueous fluorinated hydroxyl acrylic dispersion of this embodiment are as follows:

[0039] The preparation process of the aqueous fluorinated hydroxyl acrylic dispersion of this embodiment is as follows: (1) Primer solvent: Add tert-butyl carbonate, ethylene glycol monobutyl ether and dipropylene glycol butyl ether into a four-mouth reactor equipped with a stirring device, condensation reflux device, thermometer and monomer drop-adding device, start stirring and heat to 150°C.

[0040] (2) Preparation of stage I monomers: The stage I monomers and the initiator di-tert-butyl peroxide are stirred and mixed evenly to obtain stage I mixed monomers.

[0041] (3) Stage I reaction: The reaction temperature is 150°C. Use a metering pump to dropwise add the mixed monomers of Stage I into the reactor. The addition is completed within 2.5 hours. After the addition of the mixed monomers of Stage I is completed, continue to keep the temperature at 150°C for 1 hour.

[0042] (4) Preparation of stage II monomers: The stage II monomers and the initiator di-tert-butyl peroxide are stirred and mixed evenly to obtain a stage II mixed monomer.

[0043] (5) Stage II reaction: The reaction temperature is 150°C. Use a metering pump to drop the mixed monomers of stage II into the reactor. The addition is completed within 1.5 hours. After the addition of the mixed monomers of stage II is completed, continue to keep the temperature at 150°C for 0.5 hours. (6) Neutralization to form salt: Cool down to 110°C, add neutralizing agent N,N-dimethylethanolamine and continue stirring for 30 minutes.

[0044] (7) High-speed dispersion: Cool down to below 90°C, and use a metering pump to add deionized water for high-speed dispersion to obtain an aqueous fluorinated hydroxy acrylic dispersion.

[0045] Comparative Example 1 The composition materials of the aqueous fluorinated hydroxyl acrylic dispersion of this comparative example are as follows:

[0046] The preparation process of the aqueous fluorinated hydroxyl acrylic dispersion of this comparative example is as follows: (1) Primer solvent: Add tert-butyl carbonate, ethylene glycol monobutyl ether and dipropylene glycol butyl ether into a four-mouth reactor equipped with a stirring device, condensation reflux device, thermometer and monomer drop-adding device, start stirring and heat to 150°C.

[0047] (2) Preparation of stage I monomers: The stage I monomers and the initiator di-tert-butyl peroxide are stirred and mixed evenly to obtain stage I mixed monomers.

[0048] (3) Stage I reaction: The reaction temperature is 150°C. Use a metering pump to dropwise add the mixed monomers of Stage I into the reactor. The addition is completed within 2.5 hours. After the addition of the mixed monomers of Stage I is completed, continue to keep the temperature at 150°C for 1 hour.

[0049] (4) Preparation of stage II monomers: The stage II monomers and the initiator di-tert-butyl peroxide are stirred and mixed evenly to obtain stage II mixed monomers.

[0050] (5) Stage II reaction: The reaction temperature is 150°C. Use a metering pump to drop the stage II mixed monomer into the reactor. The addition is completed within 1.5 hours. After the addition of stage II mixed monomer is completed, continue to keep the temperature at 150°C for 0.5 hours. (6) Neutralization to form salt: Cool down to 110°C, add neutralizing agent N,N-dimethylethanolamine and continue stirring for 30 minutes.

[0051] (7) High-speed dispersion: Cool down to below 90°C, and use a metering pump to add deionized water for high-speed dispersion to obtain an aqueous fluorinated hydroxy acrylic dispersion.

[0052] Comparative Example 2 The constituent raw materials of the aqueous fluorinated hydroxyl acrylic dispersion of this comparative example are as follows:

[0053] The preparation process of the aqueous fluorinated hydroxyl acrylic dispersion of this comparative example is as follows: (1) Primer solvent: Add ethylene glycol monobutyl ether and dipropylene glycol butyl ether into a four-mouth reactor equipped with a stirring device, condensation reflux device, thermometer and monomer dropping device, start stirring and heat to 150°C.

[0054] (2) Preparation of stage I monomers: The stage I monomers and the initiator di-tert-butyl peroxide are stirred and mixed evenly to obtain stage I mixed monomers.

[0055] (3) Stage I reaction: The reaction temperature is 150°C. Use a metering pump to dropwise add the mixed monomers of Stage I into the reactor. The addition is completed within 2.5 hours. After the addition of the mixed monomers of Stage I is completed, continue to keep the temperature at 150°C for 1 hour.

[0056] (4) Preparation of stage II monomers: The stage II monomers and the initiator di-tert-butyl peroxide are stirred and mixed evenly to obtain stage II mixed monomers.

[0057] (5) Stage II reaction: The reaction temperature is 150°C. Use a metering pump to drop the stage II mixed monomer into the reactor. The addition is completed within 1.5 hours. After the addition of stage II mixed monomer is completed, continue to keep the temperature at 150°C for 0.5 hours. (6) Neutralization to form salt: Cool down to 110°C, add neutralizing agent N,N-dimethylethanolamine and continue stirring for 30 minutes.

[0058] (7) High-speed dispersion: Cool down to below 90°C, and use a metering pump to add deionized water for high-speed dispersion to obtain an aqueous fluorinated hydroxy acrylic dispersion.

[0059] Comparative Example 3 The composition raw materials of the aqueous fluorinated hydroxyl acrylic dispersion of Comparative Example 3 and Example 1 are the same.

[0060] The preparation process of the aqueous fluorinated hydroxyl acrylic dispersion of this comparative example is as follows: The preparation process of the aqueous fluorinated hydroxyl acrylic dispersion of this comparative example is as follows: (1) Primer solvent: Add tert-butyl carbonate, ethylene glycol monobutyl ether and dipropylene glycol butyl ether into a four-mouth reactor equipped with a stirring device, condensation reflux device, thermometer and monomer drop-adding device, start stirring and heat to 130°C.

[0061] (2) Polymerization reaction: Stir and mix the monomers according to the prescribed formula evenly, the reaction temperature is 130℃, and the mixed monomers are added dropwise into the reactor using a metering pump. The addition is controlled to be completed within 2 hours. After the addition of the mixed monomers, continue to keep the temperature at 130℃ for 1 hour. Then add additional initiators to allow the reaction monomers to react further.

[0062] (3) Neutralization to form salt: The product obtained from the mixed monomer reaction in step II was cooled to 110°C, and the neutralizing agent DMEA was added and stirred for 30 minutes.

[0063] (4) High-speed dispersion: The above system is further cooled to below 90°C, and deionized water is added dropwise using a metering pump for high-speed dispersion to obtain an aqueous fluorinated hydroxyl acrylic dispersion.

[0064] In order to verify the performance of the aqueous fluorinated hydroxy acrylic dispersion of the present invention, the performance of the aqueous fluorinated hydroxy acrylic dispersions of the above examples and comparative examples was measured. The specific results are shown in Table 1.

[0065] Table 1

[0066] The water-based fluorinated hydroxyl acrylic dispersion obtained in the above Examples 1-4 and Comparative Examples 1 and 3 was used for coating, and a polyisocyanate curing agent was used for cross-linking and curing at a ratio of NCO / OH=1.2~1.5:1. The obtained paint film was sprayed on an aluminum plate to test its performance. The coating test performance is shown in Table 2.

[0067] Table 2

[0068] It can be seen from Table 1 and Table 2 that the fluorinated hydroxyl aqueous dispersion of the present invention has the characteristics of high solid content and low viscosity. The aqueous two-component coating obtained by cross-linking and curing with polyisocyanate has excellent properties such as high gloss, high hardness, good water resistance, good weather resistance, good acid and alkali resistance after film formation, and has a long construction period.

[0069] Although the viscosity and other properties of Comparative Example 1 are comparable to those of Example 1, the weather resistance of Comparative Example 1 is poor and the construction period is shorter. This is mainly because no fluorinated acrylate monomer is used in the mixed monomer of Stage I of Comparative Example 1, and the initiator used in Comparative Example 1 is different from that of Example 1.

[0070] Although the viscosity and other properties of Comparative Example 3 are comparable to those of the embodiment, the construction period is significantly reduced. This is mainly because Comparative Example 3 adopts a one-stage mixing reaction process, while the embodiment of the present invention adopts a two-stage reaction to obtain a core-shell structured polymer, in which most of the hydroxyl groups are wrapped in the core, which can effectively slow down the reaction rate with the isocyanate group and effectively increase the construction period.

[0071] The construction period of Example 4 is slightly shorter than that of other examples and the weather resistance is slightly worse, mainly because the initiators used in other examples are different from those in Example 4. Other examples all use tert-butyl peroxybenzoate and di-tert-amyl peroxide as initiators, which have a shorter half-life and a lower initiation temperature than di-tert-butyl peroxide. In addition, the use of tert-butyl peroxybenzoate and di-tert-amyl peroxide as mixed initiators can significantly reduce the reaction time, reduce branching, and maintain the integrity of the polymer main chain, thereby further improving the weather resistance of the paint film.

[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for preparing an aqueous fluorinated hydroxyl acrylic dispersion, characterized in that: include: (1) mixing a first mixed monomer and a solvent to react to obtain a first reactant; (2) mixing a second mixed monomer with the first reactant to react to obtain a second reactant; (3) neutralizing the second reactant and dispersing it in water; In parts by weight, the first mixed monomer includes 50-80 parts of styrene, 40-80 parts of hydroxyl-containing monomers, 0-30 parts of carboxyl-containing monomers, 50-100 parts of alkyl acrylates, 0-20 parts of versatate vinyl ester monomers, 10-20 parts of fluorine-containing acrylate monomers, 0-20 parts of isobornyl methacrylate, and 5-10 parts of initiators; In parts by weight, the second mixed monomer includes 0-30 parts of hydroxyl-containing monomer, 10-330 parts of carboxyl-containing monomer, 50-100 parts of alkyl acrylate, 0-6 parts of fluorine-containing acrylate monomer, 0-20 parts of isobornyl methacrylate, and 2-3 parts of initiator.

2. The method according to claim 1, characterized in that: The first mixed monomer includes 55-70 parts of styrene, 55-75 parts of hydroxyl-containing monomers, 0-30 parts of carboxyl-containing monomers, 60-100 parts of alkyl acrylates, 10-20 parts of versatate vinyl ester monomers, 5-15 parts of isobornyl methacrylate, 10-20 parts of fluorine-containing acrylate monomers, and 5-10 parts of initiators; And / or, the second mixed monomer includes 20-30 parts of hydroxyl-containing monomer, 20-50 parts of carboxyl-containing monomer, 50-90 parts of alkyl acrylate, 3-6 parts of fluorine-containing acrylate monomer, 5-15 parts of isobornyl methacrylate, and 2-3 parts of initiator.

3. The method according to claim 1 or 2, characterized in that: The hydroxyl-containing monomer includes at least one of hydroxyethyl acrylate, hydroxyethyl methacrylate, and hydroxypropyl acrylate; And / or, the carboxyl group-containing monomer includes at least one of acrylic acid and methacrylic acid.

4. The method according to claim 1 or 2, characterized in that: The alkyl acrylate includes at least one of methyl acrylate, methyl methacrylate, ethyl acrylate, butyl acrylate, and isooctyl acrylate; And / or, the versatate-based monomer includes versatate-based vinyl carbonate.

5. The method according to claim 1 or 2, characterized in that: The fluorine-containing acrylic ester monomer includes at least one of trifluoroethyl methacrylate, hexafluorobutyl methacrylate, hexafluorobutyl acrylate, hexafluoroisopropyl methacrylate, and dodecafluoroheptyl methacrylate.

6. The method according to claim 1 or 2, characterized in that: The initiator comprises at least one of tert-butyl perbenzoate, di-tert-butyl peroxide, di-tert-amyl peroxide, diisopropylbenzene peroxide, 3,3-bis(tert-butylperoxy)ethylbutyrate, 3,3-bis(tert-amylperoxy)butyl acetate and diisopropylbenzene peroxide, preferably tert-butyl perbenzoate and di-tert-amyl peroxide; And / or, the solvent includes at least one of tert-butyl glycidyl carbonate, dipropylene glycol butyl ether, ethylene glycol monobutyl ether, propylene glycol methyl ether, diethylene glycol monobutyl ether, propylene glycol butyl ether, dipropylene glycol methyl ether, and propylene glycol diacetate.

7. The method according to claim 1 or 2, characterized in that: In step (1), the reaction temperature is 120°C to 160°C; And / or, in step (2), the reaction temperature is 120°C to 160°C.

8. The method according to claim 1 or 2, characterized in that: In step (3), the neutralizing agent used for the neutralization is 10 to 20 parts by weight; And / or, the water is 450-500 parts by weight; And / or, the neutralizing agent includes at least one of N,N-dimethylethanolamine, triethanolamine, and triethylamine.

9. An aqueous fluorinated hydroxyl acrylic dispersion, characterized in that: The method is prepared by any one of claims 1 to 8.

10. A coating, characterized in that it comprises the aqueous fluorinated hydroxyl acrylic dispersion according to claim 9.

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