Synthesis method and application of pure water-based acrylic resin

Abstract

The invention provides a synthetic method and application of pure water-based acrylic resin. The preparation method comprises the following steps: firstly, esterifying acrylic acid and fatty alcohol to prepare an acrylate monomer with a flexible chain segment and hydrophilic-hydrophobic balance; then, acrylic ester and diethanol amine are subjected to aminolysis to generate a hydroxyl-containing acrylamide derivative, hydroxyl and trimethylolpropane ester exchange is carried out to form a branched node, and the crosslinking potential of a molecular chain is increased; the hydroxyl group and the isocyanate group are combined to generate a carbamate hard segment and construct a hyperbranched skeleton, and meanwhile, double bonds are reserved for subsequent free radical polymerization; and finally, copolymerizing the flexible monomer, the hyperbranched hard-segment monomer and hydroxyethyl acrylate to form the composite resin containing high-density hydroxyl groups, wherein the soft and hard segments of the composite resin are microphase-separated. The pure water-based acrylic resin prepared by the invention has excellent adhesive force, weather resistance, solvent resistance and the like, is applied to baking varnish, effectively improves the performance of the baking varnish, and has the characteristics of being green and environment-friendly.

Description

Technical Field

[0001] The present invention relates to the field of waterborne polymer coatings, and in particular to a synthesis method and application of a pure waterborne acrylic resin. Background Art

[0002] Paint is a polymer material commonly used in industrial production and daily life, with extremely large production and consumption. Traditional paints are primarily based on oil-soluble polymers (such as benzene, toluene, and aldehydes as solvents). While these polymer coatings possess excellent physical and chemical properties, the solvents used in these coatings are highly volatile and environmentally polluting, posing significant risks to human health. With the global demand for green environmental protection increasing, the paint industry is actively turning to green environmental development.

[0003] In order to realize the coating of environmental protection, the synthesis of water-soluble polymer resin is a major mainstream direction. Now, the most widely used water-soluble resin in coating is water-based acrylic resin. Water-based acrylic resin is widely used in industrial and daily life coatings because of its water-solubility, low price and good adhesion. However, the overwhelming majority of water-based acrylic resins currently used are pseudo-water-based resins (i.e., containing harmful organic solvents in the solvent), rather than pure water-based resins, thereby further limiting the widespread use of such resins. In addition, the abilities of such resins in adhesion, weather resistance, solvent resistance, etc. are not excellent enough, and further improvement is needed to meet industrial and daily life needs. Therefore, by the side chain modification of effective synthesis process and acrylic resin, the functional side chain groups of strong molecular force, high weather resistance and resistance to solvent erosion are introduced, the ability of pure water-based acrylic resin is improved, high-performance water-based coatings are obtained, and the surface coating process applied to substrates such as glass, wood, metal and floor is of great significance.

[0004] In summary, there is an urgent need to develop a new technical solution to solve the problems existing in the existing technology. Summary of the Invention

[0005] Based on this, the present invention provides a synthesis method and application of a pure water-based acrylic resin. The present invention first esterifies acrylic acid with a fatty alcohol to prepare an acrylate monomer having both a flexible segment and a hydrophilic-hydrophobic balance; subsequently, acrylate and diethanolamine are used for aminolysis to generate a hydroxyl-containing acrylamide derivative, and a branching node is formed by ester exchange of the hydroxyl group with trimethylolpropane to increase the cross-linking potential of the molecular chain; then, the hydroxyl group is reacted with ethyl isocyanate acrylate, and the hydroxyl group is combined with the isocyanate group to generate a carbamate hard segment and construct a hyperbranched skeleton, while retaining the double bond for subsequent free radical polymerization; finally, the flexible monomer, the hyperbranched hard segment monomer and hydroxyethyl acrylate are copolymerized to form a composite resin with soft and hard segment microphase separation and high-density hydroxyl group-containing. The pure water-based acrylic resin prepared by the present invention has excellent adhesion, weather resistance, solvent resistance and other properties, and is applied to baking paint, effectively improving the performance of baking paint and having the characteristics of being green and environmentally friendly.

[0006] An object of the present invention is to provide a method for synthesizing a pure water-based acrylic resin, the method comprising the following steps:

[0007] S1, blending acrylic acid and fatty alcohol, adding a catalyst, heating and stirring to react, to obtain intermediate product 1;

[0008] S2, blending acrylate and diethanolamine, heating and reacting under inert gas protection to obtain intermediate 1; blending the intermediate 1 with trimethylolpropane, adding p-toluenesulfonic acid, and heating and reacting to obtain intermediate 2; blending the intermediate 2, ethyl isocyanate acrylate, and a polymerization inhibitor, adding dibutyltin dilaurate, and heating and reacting to obtain intermediate 2;

[0009] S3, blending the intermediate product 1, the intermediate product 2 and the hydroxyl-containing acrylate, adding an initiator, heating and stirring to react, and obtaining a pure water-based acrylic resin;

[0010] in,

[0011] The fatty alcohol is selected from one or more of fluorine-containing fatty alcohols, silicone-containing fatty alcohols, and ether-containing fatty alcohols.

[0012] Furthermore, in step S1, the molar ratio of acrylic acid to fatty alcohol is 1:(0.01-0.2); the heating temperature is 60-100° C., and the reaction time is 1-24 hours.

[0013] Furthermore, in step S2, the molar ratio of acrylate to diethanolamine is 1:(0.5-0.9); and the heating temperature for the reaction of acrylate and diethanolamine is 40-60°C.

[0014] Furthermore, in step S2, the molar ratio of the intermediate 1 to trimethylolpropane is (3-5):1; and the heating temperature for the reaction of the intermediate 1 and trimethylolpropane is 110-120°C.

[0015] Furthermore, in step S2, the molar ratio of the intermediate 2 to ethyl isocyanate acrylate is 1:(5-20); and the heating temperature for the reaction of the intermediate 2 and ethyl isocyanate acrylate is 40-60°C.

[0016] Furthermore, in step S3, the molar ratio of the intermediate product 1 to the intermediate product 2 is (2-8):1.

[0017] Furthermore, in step S3, the heating temperature is 60-80°C.

[0018] Another object of the present invention is to provide the application of the above-mentioned method for synthesizing pure water-based acrylic resin in baking varnish, wherein the baking varnish comprises the following components in parts by weight:

[0019]

[0020] The varnish is composed of the following components in parts by mass:

[0021] 40-60 parts of pure water-based acrylic resin

[0022] 10-20 parts of curing agent

[0023] 20-50 parts water.

[0024] Furthermore, the auxiliary agent is selected from one or more of a crosslinking agent, a dispersant, a wetting agent, a defoaming agent or a thickener; wherein the dosage of each auxiliary agent is: 1-25 parts of crosslinking agent, 0.1-5 parts of dispersant, 0.1-5 parts of wetting agent, 0.1-5 parts of defoaming agent, and 1-10 parts of thickener.

[0025] Furthermore, the colorant is selected from one or more of pigments, dyes, color pastes or color concentrates.

[0026] Furthermore, the amino resin is butyl ether amino resin.

[0027] Furthermore, the curing agent is selected from one or more of amines, amino resins or polyurethane curing agents.

[0028] Furthermore, the preparation method of the baking varnish comprises the following steps:

[0029] Add pure water-based acrylic resin to water, add curing agent, stir to obtain varnish, then add dispersant and wetting agent, stir, add other additives, stir evenly, add colorant, water and amino resin when using to obtain baking paint.

[0030] Furthermore, the pure water-based acrylic resin and baking varnish of the present invention do not contain aldehyde solvents, benzene solvents, or ether solvents and have a low VOC content, thus having the advantage of being green and environmentally friendly.

[0031] Furthermore, the baking paint of the present invention is prepared into a paint film by spraying, scraping, printing and the like.

[0032] Furthermore, the baking varnish is applied to the surface coating process of glass, wood, metal or floor.

[0033] The present invention has the following beneficial effects:

[0034] (1) In the synthesis method of the pure water-based acrylic resin of the present invention, acrylic acid and fatty alcohol are first esterified to obtain an acrylic acid monomer having both a flexible chain segment and a hydrophilic-hydrophobic balance; then, acrylic acid and diethanolamine are used to generate a hydroxyl-containing acrylamide derivative, and the hydroxyl group is exchanged with trimethylolpropane to form a branching node, thereby increasing the cross-linking potential of the molecular chain; then, the derivative is reacted with isocyanate ethyl acrylate, and the hydroxyl group and the isocyanate group are combined to generate a carbamate hard segment and construct a hyperbranched skeleton, while retaining double bonds for subsequent free radical polymerization; finally, the flexible monomer, the hyperbranched hard segment monomer and hydroxyethyl acrylate are copolymerized to form a composite resin with soft and hard segment microphase separation and high hydroxyl group content. In the pure water-based acrylic resin prepared by the present invention, the flexible chain segment and the carbamate hard segment cooperate to form a dynamic interpenetrating network, thereby improving the flexibility and adhesion of the material; the hyperbranched structure inhibits solvent penetration through molecular entanglement, thereby enhancing the chemical resistance of the material; the acrylic backbone and the carbamate bond cooperate to resist ultraviolet and wet heat aging, thereby ensuring the long-term stability of the material. The present invention prepares a pure water-based acrylic resin with stronger performance than traditional water-based resins through multi-scale optimization of molecular structure, providing an innovative solution for environmentally friendly baking paint.

[0035] (2) The present invention also compounds pure water-based acrylic resin with amino resin and applies them to baking varnish. Pure water-based acrylic resin has a three-dimensional structure of active hydroxyl groups and flexible chain segments, and forms a high-density cross-linked network with the amino resin during the curing process, giving the coating excellent mechanical properties, adhesion and interfacial bonding strength; the hydrophilic-hydrophobic balance design in the resin effectively improves the chemical stability of the coating; at the same time, the three-dimensional cross-linked structure and densified arrangement of the resin molecular chain significantly improve the resistance to solvent erosion. In addition, the baking varnish of the present invention has extremely high green environmental protection functions, does not contain benzene and aldehyde solvents, does not contain heavy metals, and has an extremely low VOC content. DETAILED DESCRIPTION

[0036] In order to more clearly illustrate the technical solutions of the present invention, the following examples are given. Unless otherwise stated, the raw materials, reactions and post-processing methods mentioned in the examples are common raw materials on the market and technical methods well known to those skilled in the art.

[0037] The terms "preferred," "preferably," "more preferred," and the like, used herein, refer to embodiments of the invention that may provide certain benefits under certain circumstances. However, other embodiments may also be preferred under the same or other circumstances. Furthermore, the recitation of one or more preferred embodiments does not imply that other embodiments are not useful, nor is it intended to exclude other embodiments from the scope of the invention.

[0038] It should be understood that, except in any operating examples, or where otherwise indicated, all numbers expressing, for example, quantities of ingredients used in the specification and claims are to be understood as being modified in all instances by the term "about." Accordingly, unless indicated to the contrary, the numerical parameters set forth in the following specification and appended claims are approximations that may vary depending upon the desired properties to be obtained by the present invention.

[0039] The following materials are used in the embodiments of the present invention:

[0040] Cross-linking agent: DVB, brand 218, purchased from Sichuan Yangsen Chemical.

[0041] Dispersant: PEG, brand 312, purchased from Guangdong Haoquan Chemical.

[0042] Wetting agent: ROSO3M, brand 415, purchased from Guangdong Haoquan Chemical.

[0043] Defoamer: defoamer, brand 532, purchased from Guangdong Haoquan Chemical.

[0044] Amino resin: butyl ether amino resin, brand 178, purchased from Guangdong Qianyou Chemical.

[0045] Curing agent: amino resin curing agent, brand 206, purchased from Shanghai Shenzhu Chemical.

[0046] Silver paste, red paste, black paste, white paste, phthalocyanine blue paste, medium yellow paste, golden yellow paste, pearl powder KC8302, pearl powder ME-63302A, yellow pearl powder, high gloss varnish, orange essence, brown essence, orange-red essence, and yellow essence were purchased from Dongguan Thyssen New Materials.

[0047] Matte slurry: composed of 25 parts of resin, 14 parts of diisopropyl ether methanol, 0.6 parts of dispersant, 0.02 parts of defoaming agent, 50 parts of water, and 10 parts of matting powder;

[0048] Among them, the resin is acrylic resin, brand 178, purchased from Guangdong Qianyou Chemical; the dispersant is PEG, brand 312, purchased from Guangdong Haoquan Chemical; the defoamer is defoamer, brand 532, purchased from Guangdong Haoquan Chemical; the matting powder brand is 413, purchased from Guangdong Haoquan Chemical;

[0049] Preparation method of matte slurry: mix and disperse resin, diisopropyl ether methanol, dispersant, defoaming agent and water, then add matting powder and disperse and let it stand.

[0050] The water in the embodiments of the present invention is all deionized water.

[0051] The “parts” in the embodiments of the present invention refer to parts by mass.

[0052] Example 1

[0053] A method for synthesizing a pure water-based acrylic resin, comprising the following steps:

[0054] S1. Acrylic acid and 2-(2-methoxyethoxy)ethanol were mixed (acrylic acid:2-(2-methoxyethoxy)ethanol=1:0.2, n / n), 3 wt% of p-toluenesulfonic acid was added, and the mixture was stirred at 80° C. for 10 h to obtain intermediate 1;

[0055] S2, using methanol as solvent, methyl acrylate and diethanolamine were mixed (methyl acrylate: diethanolamine = 1:0.9, n / n), and stirred at 45 ° C for 2 h under nitrogen protection, and the solvent and excess methyl acrylate were removed by rotary evaporation to obtain intermediate 1; using N, N-dimethylformamide as solvent, the intermediate 1 was mixed with trimethylolpropane (intermediate 1: trimethylolpropane = 3:1, n / n), 0.6 wt% of p-toluenesulfonic acid was added as the reactant, and the reaction was carried out at 120 ° C for 4 h, and the solvent was removed by rotary evaporation to obtain intermediate 2; using acetone as solvent, the intermediate 2 was mixed with ethyl isocyanate acrylate and p-hydroxyanisole (intermediate 2: ethyl isocyanate acrylate: p-hydroxyanisole = 1:10:1, n / n), 0.1 wt% of dibutyltin dilaurate was added as the reactant, and the reaction was carried out at 50 ° C for 4 h to obtain intermediate product 2;

[0056] S3. Blend the intermediate product 1, intermediate product 2 and hydroxyethyl acrylate (intermediate product 1: intermediate product 2: hydroxyethyl acrylate = 5:1:1, n / n / n), add 1 wt% of sodium persulfate as the reactant, and stir the reaction at 70° C. for 12 h to obtain a pure water-based acrylic resin.

[0057] Example 2

[0058] A method for synthesizing a pure water-based acrylic resin. The difference between this embodiment and embodiment 1 is that step S1 is:

[0059] S1, acrylic acid and 1H,1H,2H,2H-perfluorohexan-1-ol are blended (acrylic acid: 1H,1H,2H,2H-perfluorohexan-1-ol

[0060] =1:0.06, n / n), add 3 wt% of p-toluenesulfonic acid, and stir at 80°C for 10 h to obtain intermediate 1;

[0061] Other ingredients and preparation methods are the same as those in Example 1.

[0062] Example 3

[0063] A method for synthesizing a pure water-based acrylic resin. The difference between this embodiment and embodiment 1 is that step S1 is:

[0064] S1. Acrylic acid and 3-(trimethylsilyl)-1-propanol were mixed (acrylic acid:3-(trimethylsilyl)-1-propanol=1:0.07, n / n), 3 wt% of p-toluenesulfonic acid was added, and the mixture was stirred at 80° C. for 10 h to obtain intermediate 1;

[0065] Other ingredients and preparation methods are the same as those in Example 1.

[0066] Comparative Example 1

[0067] A method for synthesizing a pure water-based acrylic resin. The difference between this comparative example and Example 1 is that step S1 is not performed, and in step S3, the molar mass of the intermediate product 1 is replaced by acrylic acid. The other ingredients and preparation method are the same as those in Example 1.

[0068] Comparative Example 2

[0069] A method for synthesizing a pure water-based acrylic resin. The difference between this comparative example and Example 1 is that in step S2, intermediate 2 is not prepared, and intermediate 1 is blended with ethyl isocyanate acrylate to obtain intermediate product 2; other components and preparation methods are the same as those in Example 1.

[0070] Comparative Example 3

[0071] A method for synthesizing a pure water-based acrylic resin. This comparative example differs from Example 1 in that, in step S2, intermediates 1 and 2 are not prepared, and the trimethylolpropane and ethyl isocyanate acrylate are blended and reacted to obtain intermediate 2; the other components and preparation methods are the same as those in Example 1.

[0072] Application Example 1

[0073] This application example is a silver paste-containing baking varnish.

[0074] A baking varnish comprising the following components in parts by weight:

[0075]

[0076] The varnish is composed of the following components in parts by mass:

[0077] 50 parts of pure water-based acrylic resin

[0078] 5 parts of curing agent

[0079] 40.5 parts of water;

[0080] in,

[0081] The pure water-based acrylic resin was prepared as in Example 1.

[0082] The preparation method of the above baking varnish comprises the following steps:

[0083] According to the above mass parts, pure water-based acrylic resin was added to water, and a curing agent was added. The mixture was stirred and dispersed at a speed of 600 rpm for 10 minutes to obtain a varnish. Then, a dispersant and a wetting agent were added. The mixture was stirred and dispersed at a speed of 800 rpm for 10 minutes. The remaining additives were added and stirred evenly. Silver paste, water and amino resin were added during spraying to obtain a baking paint.

[0084] Application Example 2

[0085] This application example is red paint.

[0086] A baking varnish comprising the following components in parts by weight:

[0087]

[0088]

[0089] The varnish is composed of the following components in parts by mass:

[0090] 50 parts of pure water-based acrylic resin

[0091] 5 parts of curing agent

[0092] 40.5 parts of water;

[0093] in,

[0094] The pure water-based acrylic resin was prepared according to Example 2.

[0095] The difference between the preparation method of the above baking paint and Application Example 1 is that red paste, black paste, water and amino resin are added during spraying, and the other ingredients and preparation method are the same as Application Example 1.

[0096] Application Example 3

[0097] This application example is a matte paint.

[0098] A baking varnish comprising the following components in parts by weight:

[0099]

[0100] The varnish is composed of the following components in parts by mass:

[0101] 50 parts of pure water-based acrylic resin

[0102] 5 parts of curing agent

[0103] 40.5 parts of water;

[0104] in,

[0105] The pure water-based acrylic resin was prepared according to Example 3.

[0106] The difference between the preparation method of the above baking paint and Application Example 1 is that black paste, pearlescent powder KC8302, pearlescent powder ME-63302A, high gloss varnish, water and amino resin are added during spraying. Other ingredients and preparation methods are the same as those in Application Example 1.

[0107] Application Example 4

[0108] This application example is blue paint.

[0109] A baking varnish comprising the following components in parts by weight:

[0110]

[0111] The varnish is composed of the following components in parts by mass:

[0112] 50 parts of pure water-based acrylic resin

[0113] 5 parts of curing agent

[0114] 40.5 parts of water;

[0115] in,

[0116] The pure water-based acrylic resin was prepared as in Example 1.

[0117] The difference between the preparation method of the above baking paint and Application Example 1 is that white paste, phthalocyanine blue paste, medium yellow paste, water and amino resin are added during spraying. Other ingredients and preparation methods are the same as Application Example 1.

[0118] Application Example 5

[0119] This application example is orange paint.

[0120] A baking varnish comprising the following components in parts by weight:

[0121]

[0122] The varnish is composed of the following components in parts by mass:

[0123] 50 parts of pure water-based acrylic resin

[0124] 5 parts of curing agent

[0125] 40.5 parts of water;

[0126] in,

[0127] The pure water-based acrylic resin was prepared according to Example 2.

[0128] The difference between the preparation method of the above baking paint and Application Example 1 is that matte paste, silver paste, orange essence, brown essence, water and amino resin are added during spraying. Other ingredients and preparation methods are the same as Application Example 1.

[0129] Application Example 6

[0130] This application example is black matte paint.

[0131] A baking varnish comprising the following components in parts by weight:

[0132]

[0133]

[0134] The varnish is composed of the following components in parts by mass:

[0135] 50 parts of pure water-based acrylic resin

[0136] 5 parts of curing agent

[0137] 40.5 parts of water;

[0138] in,

[0139] The pure water-based acrylic resin was prepared according to Example 3.

[0140] The difference between the preparation method of the above baking paint and Application Example 1 is that black paste, 908, golden paste, orange-red essence, matte paste, yellow pearl powder, yellow essence, water and amino resin are added during spraying. The other ingredients and preparation method are the same as Application Example 1.

[0141] Comparative Application Example 1

[0142] A baking paint. The difference between this comparative application example and application example 1 is that the pure water-based acrylic resin prepared in comparative example 1 is used, and the other ingredients and preparation method are the same as those in application example 1.

[0143] Comparative Application Example 2

[0144] A baking paint. The difference between this comparative application example and application example 1 is that the pure water-based acrylic resin prepared in comparative example 2 is used, and the other ingredients and preparation method are the same as those in application example 1.

[0145] Comparative Application Example 3

[0146] A baking paint. The difference between this comparative application example and application example 1 is that the pure water-based acrylic resin prepared in comparative example 3 is used, and the other ingredients and preparation method are the same as those in application example 1.

[0147] Test Example 1

[0148] The paint films obtained from Example 1-6 and Comparative Application Examples 1-3 were tested for water resistance and solvent resistance.

[0149] Test method:

[0150] Paint film preparation: dilute the sample to the spraying viscosity and spray it on the test panel to form a uniform paint film.

[0151] The prepared paint films were soaked in 40°C hot water for 10 days, 90°C hot water for 40 min, 5% sulfuric acid solution for 30 min, 5% sodium hydroxide solution for 30 min, and industrial alcohol for 30 min, and the changes in the paint films were observed.

[0152] The test results are shown in Table 1.

[0153] Table 1 Test results of paint film water resistance and solvent resistance

[0154]

[0155] It can be seen from the above results that the baking varnish of the present invention has excellent water resistance, acid resistance, alkali resistance and solvent resistance.

[0156] Test Example 2

[0157] The paint film performance test was performed on the paint obtained from Example 1-6 and Comparative Application Examples 1-3.

[0158] Test method:

[0159] Paint film hardness (pencil hardness): refer to GB / T 6739-2022.

[0160] Adhesion (cross-hatch method): GB / T 9286-1998.

[0161] Salt water resistance: The paint films obtained in Application Examples 1-6 and Comparative Application Examples 1-3 were immersed in 3.5% NaCl for 48 hours.

[0162] Salt spray resistance time: GB / T 1771-2007.

[0163] Solvent resistance (acid and alkali immersion, 48h): GB / T 23989-2009.

[0164] Water resistance (240h): GB / T 1733-1993.

[0165] The test results are shown in Table 2.

[0166] Table 2 Paint film performance test results

[0167]

[0168]

[0169] It can be seen from the above results that the baking varnish of the present invention has good adhesion and water, salt and solvent resistance.

[0170] Test Example 3

[0171] The chemical components of the baking paint prepared in Example 1 were tested.

[0172] Test method: Refer to GB / T 23986-2009, GB / T 30647-2014, GB 30981-2020 Appendix B, GB / T6750-2007, GB / T 6283-2008.

[0173] The test results are shown in Table 3.

[0174] Table 3 Chemical composition test results

[0175]

[0176] It can be seen from the above results that the baking paint of the present invention is green and environmentally friendly and does not contain harmful substances.

[0177] Test Example 4

[0178] The benzene solvent content of the baking paint prepared in Example 1 was tested.

[0179] Test method: Refer to GB / T 23990-2009B method and use GC-FID for analysis.

[0180] The test results are shown in Table 4.

[0181] Table 4 Benzene solvent content test results

[0182]

[0183] It can be seen from the above results that the baking paint of the present invention is green and environmentally friendly and does not contain harmful organic matter.

[0184] Test Example 5

[0185] The formaldehyde content of the baking paint prepared in Example 1 was tested.

[0186] Test method: Refer to GB / T 23993-2009 and use UV-Vis for analysis.

[0187] The test results are shown in Table 5.

[0188] Table 5 Formaldehyde content test results

[0189] Test items unit MDL 001 formaldehyde mg / kg 5 ND

[0190] It can be seen from the above results that the baking paint of the present invention is green and environmentally friendly and does not contain formaldehyde.

[0191] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be embraced therein.

[0192] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A method for synthesizing a pure water-based acrylic resin, characterized in that: The synthesis method of the pure water-based acrylic resin comprises the following steps: S1, blending acrylic acid and fatty alcohol, adding a catalyst, heating and stirring to react, to obtain intermediate product 1; S2, blending acrylate and diethanolamine, heating and reacting under inert gas protection to obtain intermediate 1; blending the intermediate 1 with trimethylolpropane, adding p-toluenesulfonic acid, and heating and reacting to obtain intermediate 2; blending the intermediate 2, ethyl isocyanate acrylate, and a polymerization inhibitor, adding dibutyltin dilaurate, and heating and reacting to obtain intermediate 2; S3, blending the intermediate product 1, the intermediate product 2 and the hydroxyl-containing acrylate, adding an initiator, heating and stirring to react, and obtaining a pure water-based acrylic resin; in, The fatty alcohol is selected from one or more of fluorine-containing fatty alcohols, silicone-containing fatty alcohols, and ether-containing fatty alcohols.

2. The synthetic method of pure water-based acrylic resin according to claim 1, wherein In step S1, the molar ratio of acrylic acid to fatty alcohol is 1:(0.01-0.2).

3. The synthetic method of pure water-based acrylic resin according to claim 1, wherein In step S2, the molar ratio of the acrylate to diethanolamine is 1:(0.5-0.9).

4. The method for synthesizing pure water-based acrylic resin according to claim 1, wherein In step S2, the molar ratio of the intermediate 1 to trimethylolpropane is (3-5):

1.

5. The method for synthesizing pure water-based acrylic resin according to claim 1, wherein In step S2, the molar ratio of the intermediate 2 to ethyl isocyanate acrylate is 1:(5-20).

6. The method for synthesizing pure water-based acrylic resin according to claim 1, wherein In step S3, the molar ratio of the intermediate product 1 to the intermediate product 2 is (2-8):

1.

7. Application of the method for synthesizing pure water-based acrylic resin according to any one of claims 1 to 6 in baking varnish, characterized in that: The baking varnish comprises the following components in parts by mass: The varnish is composed of the following components in parts by mass: 40-60 parts of pure water-based acrylic resin 10-20 parts of curing agent 20-50 parts water.

8. The application of the synthetic method of pure water-based acrylic resin according to claim 7 in baking varnish, characterized in that: The auxiliary agent is selected from one or more of a cross-linking agent, a dispersant, a wetting agent, a defoaming agent or a thickener.

9. The application of the synthetic method of pure water-based acrylic resin according to claim 7 in baking varnish, characterized in that: The preparation method of the baking varnish comprises the following steps: Add pure water-based acrylic resin to water, add curing agent, stir to obtain varnish, then add dispersant and wetting agent, stir, add other additives, stir evenly, add colorant, water and amino resin when using to obtain baking paint.

10. Application of the method for synthesizing pure water-based acrylic resin according to claim 7 in baking varnish, characterized in that: The baking varnish is applied to the surface coating process of glass, wood, metal or floor.

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