Waterborne acrylic dispersion and preparation method thereof

Abstract

The invention discloses a water-based acrylic dispersion and a preparation method thereof. The water-based acrylic acid dispersion is prepared from the following components in parts by weight: 35 to 65 parts of butyl acrylate, 15 to 30 parts of ethyl methacrylate, 50 to 85 parts of isopropanol, 5 to 20 parts of acrylic acid, 1 to 5 parts of diethanol amine, 0.5 to 2.5 parts of tert-butyl peroxybenzoate, 0.1 to 0.5 part of dodecyl alcohol, 5 to 25 parts of linoleic acid, 35 to 65 parts of hydroxyethyl acrylate and 200 to 300 parts of deionized water. According to the present invention, by introducing the dodecyl alcohol, the linoleic acid and the hydroxyethyl acrylate, the hydroxyl group content can be increased, and the water-based acrylic acid dispersion has characteristics of excellent water resistance, excellent acid resistance, excellent alkali resistance and other corrosion resistance when the water-based acrylic acid dispersion is compounded with the isocyanate curing agent, further has low viscosity, and can meet the market requirements in different fields.

Description

Technical Field

[0001] The invention relates to the technical field of waterborne acrylic acid, and in particular to a waterborne acrylic acid dispersion and a preparation method thereof. Background Art

[0002] With the development of society and the progress of science, the coating industry has brought environmental problems, especially the atmospheric pollution caused by the emission of volatile organic compounds. Therefore, more and more attention has been paid to the research of water-based resins. Water-based acrylic dispersions have the advantages of high gloss, high water resistance and weather resistance, and are widely used in the coating field.

[0003] At present, there are many water-based acrylic dispersions on the market, but the existing water-based acrylic dispersion resins have problems such as high viscosity and low solid content. In addition, although some products have improved the problems of viscosity and solid content, their corrosion resistance has been reduced, resulting in a reduced application range. Therefore, the market is in urgent need of providing a water-based acrylic dispersion with a viscosity and solid content that meets the requirements and has excellent corrosion resistance. Summary of the invention

[0004] The object of the present invention is to provide an aqueous acrylic acid dispersion and a preparation method thereof. The aqueous acrylic acid dispersion has lower viscosity and excellent corrosion resistance by limiting the components and amounts thereof.

[0005] In order to achieve the above-mentioned purpose of the present invention, the following technical solutions are particularly adopted:

[0006] The first aspect of the present invention provides an aqueous acrylic dispersion, wherein the aqueous acrylic dispersion comprises the following components in parts by weight:

[0007] 35-65 parts of butyl acrylate, preferably 40-60 parts, for example 40 parts, 45 parts, 50 parts, 55 parts, 60 parts;

[0008] 15-30 parts of ethyl methacrylate, preferably 20-30 parts, for example 20 parts, 22 parts, 25 parts, 28 parts, 30 parts;

[0009] 50-85 parts of isopropanol, preferably 50-80 parts, for example 50 parts, 60 parts, 65 parts, 70 parts, 75 parts, 80 parts;

[0010] 5-20 parts of acrylic acid, preferably 10-20 parts, for example 10 parts, 12 parts, 15 parts, 18 parts, 20 parts;

[0011] 1 to 5 parts of diethanolamine, preferably 2 to 4 parts, such as 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts;

[0012] 0.5-2.5 parts of tert-butyl perbenzoate, preferably 1-2 parts, such as 1.2 parts, 1.5 parts, 1.8 parts, 2.0 parts;

[0013] 0.1-0.5 parts of dodecyl alcohol, preferably 0.2-0.5 parts, for example 0.2 parts, 0.3 parts, 0.5 parts, 0.5 parts;

[0014] 5-25 parts of linoleic acid, preferably 10-20 parts, for example 10 parts, 12 parts, 15 parts, 18 parts, 20 parts;

[0015] 35-65 parts of hydroxyethyl acrylate, preferably 40-60 parts, for example 40 parts, 45 parts, 50 parts, 55 parts, 60 parts;

[0016] 150-500 parts of deionized water, preferably 200-300 parts, for example 200 parts, 220 parts, 240 parts, 250 parts, 260 parts, 280 parts, 300 parts.

[0017] Preferably, the aqueous acrylic dispersion comprises the following components in parts by weight:

[0018] 40-60 parts of butyl acrylate, 20-30 parts of ethyl methacrylate, 50-80 parts of isopropyl alcohol, 10-20 parts of acrylic acid, 2-4 parts of diethanolamine, 1-2 parts of tert-butyl perbenzoate, 0.2-0.5 parts of dodecyl alcohol, 10-20 parts of linoleic acid, 40-60 parts of hydroxyethyl acrylate and 200-300 parts of deionized water.

[0019] Preferably, the aqueous acrylic dispersion comprises the following components in parts by weight:

[0020] 45-55 parts of butyl acrylate, 22-28 parts of ethyl methacrylate, 60-70 parts of isopropyl alcohol, 12-18 parts of acrylic acid, 2-4 parts of diethanolamine, 1-2 parts of tert-butyl perbenzoate, 0.2-0.4 parts of dodecyl alcohol, 12-18 parts of linoleic acid, 45-55 parts of hydroxyethyl acrylate and 220-280 parts of deionized water.

[0021] Preferably, the aqueous acrylic dispersion comprises the following components in parts by weight:

[0022] 50 parts of butyl acrylate, 25 parts of ethyl methacrylate, 65 parts of isopropyl alcohol, 15 parts of acrylic acid, 3 parts of diethanolamine, 1.7 parts of tert-butyl perbenzoate, 0.3 parts of dodecyl alcohol, 15 parts of linoleic acid, 50 parts of hydroxyethyl acrylate and 250 parts of deionized water.

[0023] Preferably, the weight of butyl acrylate, ethyl methacrylate, isopropanol, acrylic acid, diethanolamine, tert-butyl perbenzoate, dodecyl alcohol, linoleic acid, hydroxyethyl acrylate and deionized water accounts for at least 60wt%, preferably at least 70wt%, for example 80wt%, 90wt%, 95wt%, 99wt% or 100wt% of the total weight of the aqueous acrylic dispersion.

[0024] Preferably, in the aqueous acrylic dispersion, the mass ratio of butyl acrylate to ethyl methacrylate is 1.2 to 3.5: 1. If the mass ratio of butyl acrylate to ethyl methacrylate is less than 1.2 to 1, the corrosion resistance of the aqueous acrylic dispersion will decrease, and if the mass ratio of butyl acrylate to ethyl methacrylate is greater than 3.5 to 1, the viscosity of the acrylic dispersion may be too high.

[0025] Preferably, the total weight of dodecyl alcohol, linoleic acid and hydroxyethyl acrylate accounts for 10% to 15% of the total weight of the aqueous acrylic dispersion. If the ratio is less than 10% or greater than 15%, the corrosion resistance of the aqueous acrylic dispersion will decrease.

[0026] Preferably, the aqueous acrylic dispersion is prepared by the method described in the second aspect of the present invention.

[0027] Preferably, the solid content of the aqueous acrylic dispersion is 40% to 60%, preferably 44% to 55%.

[0028] Preferably, the viscosity of the aqueous acrylic dispersion is 300-800 cps.

[0029] Preferably, according to the method in GB / T 1771-91, the aqueous acrylic dispersion is free of rust for more than 900 hours, preferably free of rust for more than 1200 hours.

[0030] Preferably, the hardness of the aqueous acrylic dispersion is 4H or above when tested according to GB / T 6739-2006.

[0031] The second aspect of the present invention provides a method for preparing the aqueous acrylic dispersion, the method comprising the following steps:

[0032] (a) mixing butyl acrylate, part of tert-butyl peroxybenzoate, dodecyl alcohol and linoleic acid to obtain a first mixture; and mixing ethyl methacrylate, acrylic acid, remaining tert-butyl peroxybenzoate and hydroxyethyl acrylate to obtain a second mixture;

[0033] (b) adding isopropanol into a reaction kettle and heating it, then slowly adding the first mixture into the reaction kettle for reaction, and after the reaction is completed, slowly adding the second mixture into the reaction kettle for further reaction;

[0034] (c) After the reaction is completed, the temperature is lowered, and the reaction product obtained in step (b) is mixed with diethanolamine and water. After the mixing is completed, the mixture is subjected to reduced pressure distillation to obtain the aqueous acrylic acid dispersion.

[0035] Preferably, in step (a), the mass ratio of tert-butyl perbenzoate in the first mixture to that in the second mixture is (2-3):1.

[0036] Preferably, in step (b), the heating temperature of the reactor is 70-80°C.

[0037] Preferably, in the step (b), the slow adding includes dropwise addition or batchwise addition, more preferably dropwise addition.

[0038] Preferably, in the step (b), the first mixture is added dropwise to the reaction vessel for a reaction time of 1 to 6 hours, more preferably 1.5 to 3 hours.

[0039] Preferably, in the step (b), the second mixture is added dropwise to the reaction vessel and the reaction is continued for 1 to 6 hours, more preferably 2 to 4 hours.

[0040] Preferably, in step (c), the cooling refers to cooling to room temperature.

[0041] Preferably, in the step (c), the mixing is carried out under stirring conditions.

[0042] Preferably, in step (c), the stirring speed is 1500 to 2500 r / min.

[0043] Preferably, the preparation method comprises the following steps:

[0044] (a) mixing butyl acrylate, part of tert-butyl peroxybenzoate, dodecyl alcohol and linoleic acid to obtain a first mixture; and mixing ethyl methacrylate, acrylic acid, remaining tert-butyl peroxybenzoate and hydroxyethyl acrylate to obtain a second mixture;

[0045] (b) adding isopropanol into a reaction kettle and heating it, then dropping the first mixture into the reaction kettle for reaction, and after the reaction is completed, dropping the second mixture into the reaction kettle for further reaction;

[0046] (c) After the reaction is completed, the temperature is lowered to room temperature, diethanolamine and deionized water are added to the reaction product under stirring, and after stirring evenly, reduced pressure distillation is performed to obtain the aqueous acrylic acid dispersion.

[0047] The third aspect of the present invention provides a water-based coating, wherein the water-based coating comprises the water-based acrylic dispersion according to the first aspect of the present invention.

[0048] Preferably, the water-based paint is an automotive paint, a wood paint, a metal paint, or a leather paint.

[0049] Preferably, the water-based coating comprises the water-based acrylic dispersion described in the first aspect of the present invention, and a curing agent.

[0050] Preferably, the curing agent is Ultra 2547.

[0051] The fourth aspect of the present invention provides a use of the aqueous acrylic dispersion described in the first aspect of the present invention in preparing a waterborne coating.

[0052] Preferably, the water-based paint is an automotive paint, a wood paint, a metal paint, or a leather paint.

[0053] Compared with the prior art, the beneficial effects of the present invention include at least:

[0054] The inventors of the present invention unexpectedly discovered that the aqueous acrylic dispersion can increase the hydroxyl content by introducing dodecyl alcohol, linoleic acid and hydroxyethyl acrylate and adjusting the ratio of butyl acrylate and ethyl methacrylate. When used in combination with an isocyanate curing agent, the aqueous acrylic dispersion has excellent corrosion resistance such as water resistance, acid resistance, alkali resistance, etc., and has a lower viscosity, which can meet the market needs of different fields. DETAILED DESCRIPTION

[0055] The following embodiments of the technical solution of the present invention are described in detail in conjunction with the embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention.

[0056] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by those skilled in the art to which the present invention belongs.

[0057] Example 1

[0058] The embodiment of the present invention is an aqueous acrylic dispersion, which includes the following components in parts by weight:

[0059] 40 parts of butyl acrylate, 30 parts of ethyl methacrylate, 50 parts of isopropyl alcohol, 10 parts of acrylic acid, 4 parts of diethanolamine, 1 part of tert-butyl perbenzoate, 0.5 parts of dodecyl alcohol, 10 parts of linoleic acid, 60 parts of hydroxyethyl acrylate and 200 parts of deionized water.

[0060] The preparation method of the aqueous acrylic acid dispersion comprises the following steps:

[0061] (a) mixing butyl acrylate, part of tert-butyl peroxybenzoate, dodecyl alcohol and linoleic acid to obtain a first mixture; mixing ethyl methacrylate, acrylic acid, remaining tert-butyl peroxybenzoate and hydroxyethyl acrylate to obtain a second mixture, wherein the mass ratio of tert-butyl peroxybenzoate in the first mixture to the second mixture is 2:1;

[0062] (b) adding isopropanol into the reaction kettle and heating it to 70° C., then dropping the first mixture into the reaction kettle to react for 3 hours, and after the reaction is completed, dropping the second mixture into the reaction kettle to continue reacting for 4 hours;

[0063] (c) After the reaction is completed, the temperature is lowered to room temperature, and a neutralizing agent (diethanolamine) and deionized water are added to the reaction product under stirring at 1500 r / min. After stirring evenly, the mixture is subjected to reduced pressure distillation to obtain the above-mentioned aqueous acrylic acid dispersion.

[0064] Example 2

[0065] The embodiment of the present invention is an aqueous acrylic dispersion, which includes the following components in parts by weight:

[0066] 60 parts of butyl acrylate, 20 parts of ethyl methacrylate, 80 parts of isopropanol, 20 parts of acrylic acid, 2 parts of diethanolamine, 2 parts of tert-butyl perbenzoate, 0.2 parts of dodecyl alcohol, 20 parts of linoleic acid, 40 parts of hydroxyethyl acrylate and 300 parts of deionized water.

[0067] The preparation method of the aqueous acrylic acid dispersion comprises the following steps:

[0068] (a) mixing butyl acrylate, part of tert-butyl peroxybenzoate, dodecyl alcohol and linoleic acid to obtain a first mixture; mixing ethyl methacrylate, acrylic acid, remaining tert-butyl peroxybenzoate and hydroxyethyl acrylate to obtain a second mixture, wherein the mass ratio of tert-butyl peroxybenzoate in the first mixture to the second mixture is 3:1;

[0069] (b) adding isopropanol into the reaction kettle and heating it to 80° C., then dropping the first mixture into the reaction kettle to react for 1.5 h, and after the reaction is completed, dropping the second mixture into the reaction kettle to continue reacting for 2 h;

[0070] (c) After the reaction is completed, the temperature is lowered to room temperature, and a neutralizing agent (diethanolamine) and deionized water are added to the reaction product under stirring at 2500 r / min. After stirring evenly, the mixture is subjected to reduced pressure distillation to obtain the above-mentioned aqueous acrylic acid dispersion.

[0071] Example 3

[0072] The embodiment of the present invention is an aqueous acrylic dispersion, which includes the following components in parts by weight:

[0073] 45 parts of butyl acrylate, 28 parts of ethyl methacrylate, 60 parts of isopropanol, 12 parts of acrylic acid, 4 parts of diethanolamine, 1 part of tert-butyl perbenzoate, 0.2 parts of dodecyl alcohol, 12 parts of linoleic acid, 55 parts of hydroxyethyl acrylate and 220 parts of deionized water.

[0074] The preparation method of the aqueous acrylic acid dispersion comprises the following steps:

[0075] (a) mixing butyl acrylate, part of tert-butyl peroxybenzoate, dodecyl alcohol and linoleic acid to obtain a first mixture; mixing ethyl methacrylate, acrylic acid, remaining tert-butyl peroxybenzoate and hydroxyethyl acrylate to obtain a second mixture, wherein the mass ratio of tert-butyl peroxybenzoate in the first mixture to the second mixture is 2:1;

[0076] (b) adding isopropanol into the reaction kettle and heating it to 75° C., then dropping the first mixture into the reaction kettle to react for 2 h, and after the reaction is completed, dropping the second mixture into the reaction kettle to continue reacting for 3 h;

[0077] (c) After the reaction is completed, the temperature is lowered to room temperature, and a neutralizing agent (diethanolamine) and deionized water are added to the reaction product under stirring at 2000 r / min. After stirring evenly, the mixture is subjected to reduced pressure distillation to obtain the above-mentioned aqueous acrylic acid dispersion.

[0078] Example 4

[0079] The embodiment of the present invention is an aqueous acrylic dispersion, which includes the following components in parts by weight:

[0080] 55 parts of butyl acrylate, 22 parts of ethyl methacrylate, 70 parts of isopropanol, 18 parts of acrylic acid, 2 parts of diethanolamine, 2 parts of tert-butyl perbenzoate, 0.4 parts of dodecyl alcohol, 18 parts of linoleic acid, 45 parts of hydroxyethyl acrylate and 280 parts of deionized water.

[0081] The preparation method of the aqueous acrylic acid dispersion comprises the following steps:

[0082] (a) mixing butyl acrylate, part of tert-butyl peroxybenzoate, dodecyl alcohol and linoleic acid to obtain a first mixture; mixing ethyl methacrylate, acrylic acid, remaining tert-butyl peroxybenzoate and hydroxyethyl acrylate to obtain a second mixture, wherein the mass ratio of tert-butyl peroxybenzoate in the first mixture to the second mixture is 2:1;

[0083] (b) adding isopropanol into the reaction kettle and heating it to 75° C., then dropping the first mixture into the reaction kettle to react for 2 h, and after the reaction is completed, dropping the second mixture into the reaction kettle to continue reacting for 3 h;

[0084] (c) After the reaction is completed, the temperature is lowered to room temperature, and a neutralizing agent (diethanolamine) and deionized water are added to the reaction product under stirring at 2000 r / min. After stirring evenly, the mixture is subjected to reduced pressure distillation to obtain the above-mentioned aqueous acrylic acid dispersion.

[0085] Example 5

[0086] The embodiment of the present invention is an aqueous acrylic dispersion, which includes the following components in parts by weight:

[0087] 50 parts of butyl acrylate, 25 parts of ethyl methacrylate, 65 parts of isopropyl alcohol, 15 parts of acrylic acid, 3 parts of diethanolamine, 1.7 parts of tert-butyl perbenzoate, 0.3 parts of dodecyl alcohol, 15 parts of linoleic acid, 50 parts of hydroxyethyl acrylate and 250 parts of deionized water.

[0088] The preparation method of the aqueous acrylic acid dispersion comprises the following steps:

[0089] (a) mixing butyl acrylate, part of tert-butyl peroxybenzoate, dodecyl alcohol and linoleic acid to obtain a first mixture; mixing ethyl methacrylate, acrylic acid, remaining tert-butyl peroxybenzoate and hydroxyethyl acrylate to obtain a second mixture, wherein the mass ratio of tert-butyl peroxybenzoate in the first mixture to the second mixture is 2:1;

[0090] (b) adding isopropanol into the reaction kettle and heating it to 75° C., then dropping the first mixture into the reaction kettle to react for 2 h, and after the reaction is completed, dropping the second mixture into the reaction kettle to continue reacting for 3 h;

[0091] (c) After the reaction is completed, the temperature is lowered to room temperature, and a neutralizing agent (diethanolamine) and deionized water are added to the reaction product under stirring at 2000 r / min. After stirring evenly, the mixture is subjected to reduced pressure distillation to obtain the above-mentioned aqueous acrylic acid dispersion.

[0092] Comparative Example 1

[0093] This comparative example is an aqueous acrylic dispersion, which comprises the following components in parts by weight:

[0094] 50 parts of butyl acrylate, 25 parts of ethyl methacrylate, 65 parts of isopropyl alcohol, 30 parts of acrylic acid, 3 parts of diethanolamine, 1.7 parts of tert-butyl perbenzoate, 0.3 parts of dodecyl alcohol, 50 parts of hydroxyethyl acrylate and 250 parts of deionized water.

[0095] The preparation method of the aqueous acrylic acid dispersion comprises the following steps:

[0096] (a) mixing butyl acrylate, part of tert-butyl peroxybenzoate and dodecyl alcohol to obtain a first mixture; mixing ethyl methacrylate, acrylic acid, remaining tert-butyl peroxybenzoate and hydroxyethyl acrylate to obtain a second mixture, wherein the mass ratio of tert-butyl peroxybenzoate in the first mixture to the second mixture is 2:1;

[0097] (b) adding isopropanol into the reaction kettle and heating it to 75° C., then dropping the first mixture into the reaction kettle to react for 2 h, and after the reaction is completed, dropping the second mixture into the reaction kettle to continue reacting for 3 h;

[0098] (c) After the reaction is completed, the temperature is lowered to room temperature, and a neutralizing agent (diethanolamine) and deionized water are added to the reaction product under stirring at 2000 r / min. After stirring evenly, the mixture is subjected to reduced pressure distillation to obtain the above-mentioned aqueous acrylic acid dispersion.

[0099] Comparative Example 2

[0100] This comparative example is an aqueous acrylic dispersion, which comprises the following components in parts by weight:

[0101] 25 parts of butyl acrylate, 50 parts of ethyl methacrylate, 65 parts of isopropyl alcohol, 15 parts of acrylic acid, 3 parts of diethanolamine, 1.7 parts of tert-butyl perbenzoate, 0.3 parts of dodecyl alcohol, 15 parts of linoleic acid, 50 parts of hydroxyethyl acrylate and 250 parts of deionized water.

[0102] The preparation method of the aqueous acrylic acid dispersion comprises the following steps:

[0103] (a) mixing butyl acrylate, part of tert-butyl peroxybenzoate, dodecyl alcohol and linoleic acid to obtain a first mixture; mixing ethyl methacrylate, acrylic acid, remaining tert-butyl peroxybenzoate and hydroxyethyl acrylate to obtain a second mixture, wherein the mass ratio of tert-butyl peroxybenzoate in the first mixture to the second mixture is 2:1;

[0104] (b) adding isopropanol into the reaction kettle and heating it to 75° C., then dropping the first mixture into the reaction kettle to react for 2 h, and after the reaction is completed, dropping the second mixture into the reaction kettle to continue reacting for 3 h;

[0105] (c) After the reaction is completed, the temperature is lowered to room temperature, and a neutralizing agent (diethanolamine) and deionized water are added to the reaction product under stirring at 2000 r / min. After stirring evenly, the mixture is subjected to reduced pressure distillation to obtain the above-mentioned aqueous acrylic acid dispersion.

[0106] Test Case

[0107] The aqueous acrylic acid dispersions of Examples 1 to 5 and Comparative Examples 1 to 2 were obtained respectively;

[0108] The above aqueous acrylic dispersion was mixed with the curing agent Ultra 2547, and after adjusting the viscosity, a performance test was performed;

[0109] Salt spray resistance test:

[0110] The salt spray resistance of the above different aqueous acrylic dispersions was tested according to the method in GB / T 1771-91. The test results are shown in Table 1.

[0111] Hardness test:

[0112] The test was carried out in accordance with GB / T 6739-2006; the test results are shown in Table 1;

[0113] The solid content and viscosity of the aqueous acrylic dispersion were tested, and the test results are shown in Table 1;

[0114] Table 1

[0115]

[0116] From Table 1, we can see that:

[0117] It can be seen that the hardness of Comparative Example 1 without adding linoleic acid is significantly reduced compared with Example 5, and the corrosion resistance is poor, while Comparative Example 2 changes the ratio of butyl acrylate and ethyl methacrylate compared with Example 5, resulting in low hardness and extremely poor corrosion resistance.

[0118] Therefore, the technical solution of the present invention can better improve the overall performance of the water-based acrylic dispersion prepared by limiting the raw material components and the amounts used, and specifically, can significantly improve the hardness and corrosion resistance of the film after formation.

[0119] 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 replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. An aqueous acrylic dispersion, It is characterized in that It includes the following components by weight: 35-65 parts of butyl acrylate, 15-30 parts of ethyl methacrylate, 50-85 parts of isopropyl alcohol, 5-20 parts of acrylic acid, 1-5 parts of diethanolamine, 0.5-2.5 parts of tert-butyl perbenzoate, 0.1-0.5 parts of dodecyl alcohol, 5-25 parts of linoleic acid, 35-65 parts of hydroxyethyl acrylate, and 200-300 parts of deionized water.

2. The aqueous acrylic dispersion according to claim 1, It is characterized in that It includes the following components by weight: 40-60 parts of butyl acrylate, 20-30 parts of ethyl methacrylate, 50-80 parts of isopropyl alcohol, 10-20 parts of acrylic acid, 2-4 parts of diethanolamine, 1-2 parts of tert-butyl perbenzoate, 0.2-0.5 parts of dodecyl alcohol, 10-20 parts of linoleic acid, 40-60 parts of hydroxyethyl acrylate, and 220-280 parts of deionized water.

3. The aqueous acrylic dispersion according to claim 1, It is characterized in that It includes the following components by weight: 45-55 parts of butyl acrylate, 22-28 parts of ethyl methacrylate, 60-70 parts of isopropyl alcohol, 12-18 parts of acrylic acid, 2-4 parts of diethanolamine, 1-2 parts of tert-butyl perbenzoate, 0.2-0.4 parts of dodecyl alcohol, 12-18 parts of linoleic acid, 45-55 parts of hydroxyethyl acrylate, and 240-260 parts of deionized water.

4. The aqueous acrylic dispersion according to claim 1, It is characterized in that In the aqueous acrylic dispersion, the mass ratio of butyl acrylate to ethyl methacrylate is 1.2 to 3.5:

1.

5. The aqueous acrylic dispersion according to claim 1, It is characterized in that In the aqueous acrylic dispersion, the total weight of dodecyl alcohol, linoleic acid and hydroxyethyl acrylate accounts for 10% to 15% of the total weight of the aqueous acrylic dispersion.

6. A method for preparing an aqueous acrylic acid dispersion according to any one of claims 1 to 5, It is characterized in that The preparation method comprises the following steps: (a) mixing butyl acrylate, part of tert-butyl peroxybenzoate, dodecyl alcohol and linoleic acid to obtain a first mixture; and mixing ethyl methacrylate, acrylic acid, remaining tert-butyl peroxybenzoate and hydroxyethyl acrylate to obtain a second mixture; (b) adding isopropanol into a reaction kettle and heating it, then slowly adding the first mixture into the reaction kettle for reaction, and after the reaction is completed, slowly adding the second mixture into the reaction kettle for further reaction; (c) After the reaction is completed, the temperature is lowered, and the reaction product obtained in step (b) is mixed with diethanolamine and water. After the mixing is completed, the mixture is subjected to reduced pressure distillation to obtain the aqueous acrylic acid dispersion.

7. The preparation method according to claim 6, It is characterized in that In the step (a), the mass ratio of tert-butyl perbenzoate in the first mixture to that in the second mixture is (2-3):

1.

8. The preparation method according to claim 6, It is characterized in that In the step (b), the heating temperature of the reactor is 70-80°C.

9. A water-based paint, It is characterized in that The water-based coating comprises the water-based acrylic dispersion according to any one of claims 1 to 5.

10. Use of the aqueous acrylic dispersion according to any one of claims 1 to 5 in the preparation of waterborne coatings.

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