CN108587377B - Environment-friendly water-based paint and preparation method thereof - Google Patents
Environment-friendly water-based paint and preparation method thereof Download PDFInfo
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- C08F220/34—Esters containing nitrogen, e.g. N,N-dimethylaminoethyl (meth)acrylate
- C08F220/36—Esters containing nitrogen, e.g. N,N-dimethylaminoethyl (meth)acrylate containing oxygen in addition to the carboxy oxygen, e.g. 2-N-morpholinoethyl (meth)acrylate or 2-isocyanatoethyl (meth)acrylate
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Abstract
The invention provides an environment-friendly water-based paint which is prepared from the following components in parts by weight: 60-70 parts of pyrrolidone grafted polyacrylate film-forming polymer, 1-3 parts of dispersing agent, 15-20 parts of modified nano titanium dioxide, 1-2 parts of flatting agent, 1-3 parts of defoaming agent and 10-20 parts of water. The invention also discloses a preparation method of the environment-friendly water-based paint, which comprises the following steps: and sequentially mixing and stirring the pyrrolidone grafted polyacrylate film-forming polymer, the dispersing agent, the modified nano titanium dioxide, the flatting agent, the defoaming agent and water according to the mass percentage, adding the auxiliary agent, grinding and filtering to obtain the environment-friendly water-based paint. The environment-friendly water-based paint prepared by the invention has the advantages of lower production cost, more excellent comprehensive performance of paint, more environmental protection, stronger adhesion with a base material, higher stability, higher hardness of a paint film, higher fullness and wider construction.
Description
Technical Field
The invention relates to the technical field of paint and a preparation method thereof, in particular to environment-friendly water-based paint and a preparation method thereof.
Background
In recent years, with the development of economy, people have higher and higher requirements on living quality level and home decoration in life, and the decoration materials are required to bring visual aesthetic feeling and comfort, and meanwhile, the decoration materials are required to be low in cost, more environment-friendly, safer, non-irritant and durable. Paint is one of common decoration materials, the wide use of the paint improves the life quality of people, but the traditional paint contains toxic and harmful substances such as methanol, and the emission of the organic volatile matters causes serious damage to the ecological environment for the survival of people and the physical and mental health of people. Therefore, the development of a paint which does not contain organic volatile and has little influence on the air environment becomes a hot spot of research in the industry.
The water paint is a paint which takes water as a diluent and does not contain organic solvent, has the characteristics of no benzene, toluene, xylene, formaldehyde and free TDI toxic heavy metal, no toxicity, no pungent smell, no harm to human bodies, no environmental pollution, plump paint film, glittering and translucent property, good flexibility, water resistance, wear resistance, aging resistance, yellowing resistance, quick drying, convenient use and the like. Can be used in: wood, metal, plastic, glass, building surface and other materials. The paint can fundamentally solve the problem of harm of the traditional solvent-based paint to human bodies and the environment, and compared with the solvent-based paint, the water-based paint has great superiority in the aspects of energy conservation and environmental protection. However, the domestic water-based paint is not high in utilization rate at present, and the main reason is that the traditional water-based paint still has technical defects, such as low hardness of a paint film, poor wear resistance, leveling property, film-forming property and gloss and difficult defoaming.
Chinese patent 201711046841.6 discloses an alkyd resin water paint with high drying speed, which is prepared from the following components in parts by weight: 55-60 parts of triglyceride, 40-50 parts of polyvinyl acetate emulsion, 30-35 parts of phthalic anhydride, 25-30 parts of pentaerythritol, 5-10 parts of terpineol, 3-5 parts of filler, 2-3 parts of auxiliary agent, 0.2-0.4 part of catalyst, 0.1-0.3 part of active zeolite powder and 70-80 parts of water, and the disordered mesoporous structure of the active zeolite powder can change the arrangement structure of hydrophilic groups contained in a film forming substance, so that the water absorption of the film forming substance is reduced, the corrosion resistance of the film is improved, and the construction, drying and curing processes are accelerated. However, the addition of the active zeolite powder easily causes poor stability of the water paint. The hardness, wear resistance and leveling property of the paint film are required to be further improved.
Therefore, the market needs an environment-friendly water-based paint which has low production cost, large paint film hardness, high fullness, wide construction, good stability, safe use and environmental protection.
Disclosure of Invention
The invention mainly aims to provide the environment-friendly water-based paint and the preparation method thereof, the preparation method is simple and feasible, the requirements on equipment and reaction conditions are not high, the raw materials are easy to obtain, the price is low, the prepared environment-friendly water-based paint overcomes the defects of difficult construction, water intolerance, easy peeling, poor fullness, poor hardness and the like of the water-based paint in the prior art, the production cost is lower, the comprehensive performance of the paint is more excellent, the paint is more environment-friendly, the adhesive force with a base material is stronger, the stability is higher, the hardness of a paint film is higher, the fullness is higher, and the construction is wider.
In order to achieve the aim, the invention provides an environment-friendly water-based paint which is prepared from the following components in parts by weight: 60-70 parts of pyrrolidone grafted polyacrylate film-forming polymer, 1-3 parts of dispersing agent, 15-20 parts of modified nano titanium dioxide, 1-2 parts of flatting agent, 1-3 parts of defoaming agent and 10-20 parts of water.
Preferably, the dispersant is sodium hexametaphosphate and/or sodium polycarboxylate; the antifoaming agent is preferably one or more of tributyl phosphate, antifoaming agent Demodex 3100 and antifoaming agent BYK 088; the leveling agent is preferably one or more of a polyacrylate leveling agent, a cellulose acetate butyrate leveling agent and a polyvinyl butyral leveling agent.
Preferably, the preparation method of the pyrrolidone grafted polyacrylate film-forming polymer comprises the following steps:
1) dissolving ethyl 2-chloroacrylate and 1,1' - (iminobis-2, 1-ethanediyl) bis (2-pyrrolidone) in an organic solvent, stirring and reacting for 10-12 hours at room temperature, and then removing the solvent by rotary evaporation to obtain an intermediate;
2) adding the intermediate obtained in the step 1), ethoxyethoxyethyl acrylate into a four-neck flask with a condenser, a stirrer and a thermometer, heating to 80-90 ℃ in an oil bath, slowly adding an initiator into the flask by using a constant-pressure funnel, adding the initiator within 0.5-1 hour, adding isopropanol into the flask after the addition is finished, keeping the temperature, continuously stirring and reacting for 3-5 hours under the atmosphere of nitrogen or inert gas, cooling to room temperature, adding hydroxymalonic acid, stirring and reacting for 0.5-1 hour, performing rotary evaporation, and drying for 12 hours at 60 ℃ in a vacuum drying oven to obtain the pyrrolidone grafted polyacrylate film-forming polymer.
Preferably, the mass ratio of the ethyl 2-chloroacrylate, the 1,1' - (imino di-2, 1-ethanediyl) di (2-pyrrolidone) and the organic solvent in the step 1) is 1.12:1 (5-8).
Preferably, the organic solvent is selected from one or more of diethyl ether, dichloromethane, ethyl acetate and acetone.
Preferably, the mass ratio of the intermediate, the ethoxyethoxyethyl acrylate, the initiator, the isopropanol and the tartronic acid in the step 2) is 2:1 (0.03-0.05): 5-8: 0.5-1.
Preferably, the initiator is selected from one or more of azobisisobutyronitrile and azobisisoheptonitrile.
Preferably, the inert gas is selected from one or more of helium, neon and argon.
Preferably, the preparation method of the modified nano titanium dioxide comprises the following steps: dispersing nano titanium dioxide in isopropanol, adding a silane coupling agent KH560, stirring and reacting for 4-6 hours at room temperature, adding polyetheramine, stirring and refluxing for reaction for 4-6 hours at 70-80 ℃, performing rotary evaporation, washing for 3-5 times by using ethanol, and drying for 10-14 hours at 75-85 ℃ in a vacuum drying oven.
Preferably, the mass ratio of the nano titanium dioxide, the isopropanol, the silane coupling agent KH560 and the polyether amine is (3-5): 10-15):0.15: (0.3-0.5).
Preferably, the preparation method of the environment-friendly water-based paint comprises the following steps: and sequentially mixing and stirring the pyrrolidone grafted polyacrylate film-forming polymer, the dispersing agent, the modified nano titanium dioxide, the flatting agent, the defoaming agent and water according to the mass percentage, adding the auxiliary agent, grinding and filtering to obtain the environment-friendly water-based paint.
Due to the application of the technical scheme, the invention has the following beneficial effects:
(1) the preparation method of the environment-friendly water-based paint disclosed by the invention is simple and feasible, has low requirements on equipment and reaction conditions, is easy to obtain raw materials, is low in price and is suitable for large-scale production.
(2) The environment-friendly water-based paint disclosed by the invention overcomes the defects of difficult construction, water resistance, easy peeling, poor fullness, poor hardness and the like of the water-based paint in the prior art, is lower in production cost, more excellent in comprehensive performance of the paint, more environment-friendly, stronger in adhesive force with a base material, higher in stability, larger in paint film hardness, higher in fullness and more extensive in construction.
(3) According to the environment-friendly water paint disclosed by the invention, the surface of the nano silicon dioxide is modified, and the polyether amine is introduced, so that the dispersion of the nano silicon dioxide is facilitated, and the stability of the water paint is better.
(4) The environment-friendly water-based paint disclosed by the invention has the advantages that all components have synergistic effect, so that the water-based paint has better comprehensive performance and larger adhesive force with a base material, and a paint film is cured and crosslinked through ionic bonds, so that the performances of weather resistance and the like of the paint film are further improved. And the formaldehyde purifying agent does not contain volatile organic solvent, does not release harmful substances such as formaldehyde and the like, but has a purifying effect on formaldehyde, and is more environment-friendly in use.
Detailed Description
The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art.
The raw materials used in the examples of the present invention were purchased from Mobei (Shanghai) Biotech limited.
Example 1
The environment-friendly water-based paint is prepared from the following components in parts by weight: 60 parts of pyrrolidone grafted polyacrylate film-forming polymer, 1 part of sodium hexametaphosphate, 15 parts of modified nano titanium dioxide, 1 part of polyacrylate flatting agent, 1 part of tributyl phosphate and 10 parts of water.
The preparation method of the pyrrolidone grafted polyacrylate film-forming polymer comprises the following steps:
1) dissolving 11.2g of ethyl 2-chloroacrylate and 10g of 1,1' - (imino di-2, 1-ethanediyl) di (2-pyrrolidone) in 50g of diethyl ether, stirring and reacting at room temperature for 10 hours, and then performing rotary evaporation to remove the diethyl ether to obtain an intermediate;
2) adding 20g of the intermediate prepared in the step 1) and 10g of ethoxyethoxyethyl acrylate into a four-neck flask with a condenser, a stirrer and a thermometer, heating the mixture in an oil bath to 80 ℃, slowly adding 0.3g of azodiisobutyronitrile into the flask by using a constant-pressure funnel, completing the addition within 0.5 hour, adding 50g of isopropanol into the mixture after the addition, keeping the temperature, continuously stirring and reacting for 3 hours under the nitrogen atmosphere, cooling to room temperature, adding 5g of hydroxymalonic acid, stirring and reacting for 0.5 hour, performing rotary evaporation, and drying at 60 ℃ in a vacuum drying oven for 12 hours to obtain the pyrrolidone grafted polyacrylate film-forming polymer.
The preparation method of the modified nano titanium dioxide comprises the following steps: dispersing 30g of nano titanium dioxide in 100g of isopropanol, adding KH5601.5g of silane coupling agent, stirring at room temperature for reaction for 4 hours, adding 3g of polyether amine, stirring at 70 ℃, refluxing for reaction for 4 hours, performing rotary evaporation, washing with ethanol for 3 times, and drying at 75 ℃ in a vacuum drying oven for 10 hours.
The preparation method of the environment-friendly water-based paint comprises the following steps: and sequentially mixing and stirring the pyrrolidone grafted polyacrylate film-forming polymer, sodium hexametaphosphate, modified nano titanium dioxide, a polyacrylate leveling agent, tributyl phosphate and water according to the mass percentage, adding an auxiliary agent, grinding and filtering to obtain the environment-friendly water-based paint.
Example 2
The environment-friendly water-based paint is prepared from the following components in parts by weight: 63 parts of pyrrolidone grafted polyacrylate film-forming polymer, 2 parts of sodium polycarboxylate, 17 parts of modified nano titanium dioxide, 1 part of cellulose acetate leveling agent, 31002 parts of defoaming agent and 13 parts of water.
The preparation method of the pyrrolidone grafted polyacrylate film-forming polymer comprises the following steps:
1) dissolving 11.2g of ethyl 2-chloroacrylate and 10g of 1,1' - (iminobis-2, 1-ethanediyl) bis (2-pyrrolidone) in 65g of dichloromethane, stirring and reacting at room temperature for 10.5 hours, and then removing the solvent by rotary evaporation to obtain an intermediate;
2) adding 20g of the intermediate prepared in the step 1) and 10g of ethoxyethoxyethyl acrylate into a four-neck flask with a condenser, a stirrer and a thermometer, heating the mixture in an oil bath to 83 ℃, slowly adding 0.35g of azobisisoheptonitrile into the flask by using a constant-pressure funnel, adding the mixture within 0.6 hour, adding 65g of isopropanol into the mixture after the addition is finished, keeping the temperature, continuously stirring and reacting for 3.5 hours under the helium atmosphere, cooling to room temperature, adding 6.5g of hydroxymalonic acid, stirring and reacting for 0.6 hour, performing rotary evaporation, and drying at 60 ℃ in a vacuum drying oven for 12 hours to obtain the pyrrolidone grafted polyacrylate film-forming polymer.
The preparation method of the modified nano titanium dioxide comprises the following steps: dispersing 35g of nano titanium dioxide in 120g of isopropanol, adding KH5601.5g of silane coupling agent, stirring and reacting for 4.5 hours at room temperature, adding 3.5g of polyether amine, stirring and refluxing at 73 ℃ for reacting for 4.5 hours, performing rotary evaporation, washing for 4 times by using ethanol, and drying at 78 ℃ for 12 hours in a vacuum drying oven.
The preparation method of the environment-friendly water-based paint comprises the following steps: and sequentially mixing and stirring the pyrrolidone grafted polyacrylate film-forming polymer, the sodium polycarboxylate, the modified nano titanium dioxide, the cellulose acetate leveling agent, the defoaming agent, the humble 3100 and water according to the mass percentage, then adding the auxiliary agent, grinding and filtering to obtain the environment-friendly water-based paint.
Example 3
The environment-friendly water-based paint is prepared from the following components in parts by weight: 65 parts of pyrrolidone grafted polyacrylate film-forming polymer, 2 parts of sodium hexametaphosphate, 18 parts of modified nano titanium dioxide, 2 parts of polyvinyl butyral flatting agent, 16 parts of defoaming agent BYK0882 and water.
The preparation method of the pyrrolidone grafted polyacrylate film-forming polymer comprises the following steps:
1) dissolving 11.2g of ethyl 2-chloroacrylate and 10g of 1,1' - (iminobis-2, 1-ethanediyl) bis (2-pyrrolidone) in 70g of ethyl acetate, stirring and reacting at room temperature for 11 hours, and then removing the solvent by rotary evaporation to obtain an intermediate;
2) adding 20g of the intermediate obtained in the step 1) and 10g of ethoxyethoxyethyl acrylate into a four-neck flask with a condenser, a stirrer and a thermometer, heating the mixture in an oil bath to 87 ℃, slowly adding 0.4g of azodiisoheptanoonitrile into the flask by using a constant-pressure funnel, adding the azodiisoheptanoonitrile within 0.8 hour, adding 70g of isopropanol into the mixture after the adding is finished, keeping the temperature, continuously stirring and reacting for 4 hours under the neon atmosphere, cooling to room temperature, adding 7.5g of hydroxymalonic acid, stirring and reacting for 0.8 hour, performing rotary evaporation, and drying at 60 ℃ in a vacuum drying oven for 12 hours to obtain the pyrrolidone grafted polyacrylate film-forming polymer.
The preparation method of the modified nano titanium dioxide comprises the following steps: dispersing 40g of nano titanium dioxide in 135g of isopropanol, adding KH5601.5g of silane coupling agent, stirring at room temperature for reaction for 5 hours, adding 4g of polyether amine, stirring at 77 ℃, refluxing for reaction for 5 hours, performing rotary evaporation, washing with ethanol for 4 times, and drying at 80 ℃ in a vacuum drying oven for 12.5 hours.
The preparation method of the environment-friendly water-based paint comprises the following steps: and sequentially mixing and stirring the pyrrolidone grafted polyacrylate film-forming polymer, sodium hexametaphosphate, modified nano titanium dioxide, a polyvinyl butyral flatting agent, a defoaming agent BYK088 and water according to the mass percentage, adding an auxiliary agent, grinding and filtering to obtain the environment-friendly water-based paint.
Example 4
The environment-friendly water-based paint is prepared from the following components in parts by weight: 68 parts of pyrrolidone grafted polyacrylate film-forming polymer, 3 parts of dispersing agent, 18 parts of modified nano titanium dioxide, 2 parts of flatting agent, 3 parts of defoaming agent and 18 parts of water; the dispersing agent is a mixture formed by mixing sodium hexametaphosphate and sodium polycarboxylate according to the mass ratio of 2: 3; the defoaming agent is a mixture formed by mixing tributyl phosphate, a defoaming agent Demodex 3100 and a defoaming agent BYK088 according to the mass ratio of 1:3: 2; the leveling agent is a mixture formed by mixing a polyacrylate leveling agent, a cellulose acetate butyrate leveling agent and a polyvinyl butyral leveling agent according to a mass ratio of 3:4: 5.
The preparation method of the pyrrolidone grafted polyacrylate film-forming polymer comprises the following steps:
1) dissolving 11.2g of ethyl 2-chloroacrylate and 10g of 1,1' - (iminobis-2, 1-ethanediyl) bis (2-pyrrolidone) in 75g of acetone, stirring and reacting at room temperature for 11.5 hours, and then removing the solvent by rotary evaporation to obtain an intermediate;
2) adding 20g of the intermediate prepared in the step 1) and 10g of ethoxyethoxyethyl acrylate into a four-neck flask with a condenser, a stirrer and a thermometer, heating the mixture to 88 ℃ in an oil bath, slowly adding 0.45g of an initiator into the flask by using a constant-pressure funnel, adding the initiator within 0.9 hour, adding 75g of isopropanol into the flask after the addition is finished, keeping the temperature, continuously stirring and reacting for 4.5 hours under the argon atmosphere, cooling to room temperature, adding 9g of hydroxymalonic acid, stirring and reacting for 0.9 hour, performing rotary evaporation, and drying at 60 ℃ in a vacuum drying oven for 12 hours to obtain the pyrrolidone grafted polyacrylate film-forming polymer; the initiator is a mixture formed by mixing azodiisobutyronitrile and azodiisoheptonitrile according to the mass ratio of 2: 5.
The preparation method of the modified nano titanium dioxide comprises the following steps: dispersing 45g of nano titanium dioxide in 145g of isopropanol, adding 1.5g of silane coupling agent KH5601 g into the isopropanol, stirring the mixture at room temperature for reaction for 5.5 hours, adding 4.5g of polyether amine into the mixture, stirring the mixture at 78 ℃, refluxing the mixture for reaction for 5.5 hours, performing rotary evaporation, washing the mixture for 5 times by using ethanol, and drying the mixture for 13 hours at 83 ℃.
The preparation method of the environment-friendly water-based paint comprises the following steps: and sequentially mixing and stirring the pyrrolidone grafted polyacrylate film-forming polymer, the dispersing agent, the modified nano titanium dioxide, the flatting agent, the defoaming agent and water according to the mass percentage, adding the auxiliary agent, grinding and filtering to obtain the environment-friendly water-based paint.
Example 5
The environment-friendly water-based paint is prepared from the following components in parts by weight: 70 parts of pyrrolidone grafted polyacrylate film-forming polymer, 3 parts of sodium polycarboxylate, 20 parts of modified nano titanium dioxide, 2 parts of polyacrylate flatting agent, 3 parts of tributyl phosphate and 20 parts of water.
The preparation method of the pyrrolidone grafted polyacrylate film-forming polymer comprises the following steps:
1) dissolving 11.2g of ethyl 2-chloroacrylate and 10g of 1,1' - (imino di-2, 1-ethanediyl) di (2-pyrrolidone) in 80g of dichloromethane, stirring and reacting at room temperature for 12 hours, and then removing the solvent by rotary evaporation to obtain an intermediate;
2) adding 20g of the intermediate prepared in the step 1) and 10g of ethoxyethoxyethyl acrylate into a four-neck flask with a condenser, a stirrer and a thermometer, heating the mixture to 90 ℃ in an oil bath, slowly adding 0.5g of azodiisobutyronitrile into the flask by using a constant-pressure funnel, adding the azodiisobutyronitrile within 1 hour, adding 80g of isopropanol into the mixture after the addition is finished, keeping the temperature, continuously stirring and reacting for 5 hours in a nitrogen atmosphere, cooling to room temperature, adding 10g of hydroxymalonic acid, stirring and reacting for 1 hour, performing rotary evaporation, and drying at 60 ℃ in a vacuum drying oven for 12 hours to obtain the pyrrolidone grafted polyacrylate film-forming polymer.
The preparation method of the modified nano titanium dioxide comprises the following steps: dispersing 50g of nano titanium dioxide in 150g of isopropanol, adding KH5601.5g of silane coupling agent, stirring at room temperature for reaction for 6 hours, adding 5g of polyether amine, stirring at 80 ℃, refluxing for reaction for 6 hours, performing rotary evaporation, washing with ethanol for 5 times, and drying at 85 ℃ in a vacuum drying oven for 14 hours.
The preparation method of the environment-friendly water-based paint comprises the following steps: and sequentially mixing and stirring the pyrrolidone grafted polyacrylate film-forming polymer, the sodium polycarboxylate, the modified nano titanium dioxide, the polyacrylate leveling agent, the tributyl phosphate and the water according to the mass percentage, adding the auxiliary agent, grinding and filtering to obtain the environment-friendly water-based paint.
Comparative example
The example provides a water paint, the raw materials and the formula of which are the same as the example 1 of the Chinese patent CN 107083170A.
The water-based paints obtained in the above examples 1 to 5 and comparative example were subjected to the relevant performance tests, and the test results are shown in Table 1.
TABLE 1
As can be seen from Table 1, compared with the water-based paint in the prior art, the environment-friendly water-based paint disclosed by the embodiment of the invention has the advantages of more excellent water resistance and hardness, larger adhesive force, shorter drying time and more environmental protection.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. The environment-friendly water-based paint is characterized by being prepared from the following components in parts by weight: 60-70 parts of pyrrolidone grafted polyacrylate film-forming polymer, 1-3 parts of dispersing agent, 15-20 parts of modified nano titanium dioxide, 1-2 parts of flatting agent, 1-3 parts of defoaming agent and 10-20 parts of water;
the preparation method of the pyrrolidone grafted polyacrylate film-forming polymer comprises the following steps:
1) dissolving ethyl 2-chloroacrylate and 1,1' - (iminobis-2, 1-ethanediyl) bis (2-pyrrolidone) in an organic solvent, stirring and reacting for 10-12 hours at room temperature, and then removing the solvent by rotary evaporation to obtain an intermediate;
2) adding the intermediate obtained in the step 1) and ethoxyethoxyethyl acrylate into a four-neck flask with a condenser, a stirrer and a thermometer, heating to 80-90 ℃ in an oil bath, slowly adding an initiator into the flask by using a constant-pressure funnel, adding the initiator within 0.5-1 hour, adding isopropanol into the flask after the addition is finished, keeping the temperature, continuously stirring and reacting for 3-5 hours under the atmosphere of nitrogen or inert gas, cooling to room temperature, adding hydroxymalonic acid, stirring and reacting for 0.5-1 hour, performing rotary evaporation, and drying for 12 hours at 60 ℃ in a vacuum drying oven to obtain the pyrrolidone grafted polyacrylate film-forming polymer;
the mass ratio of the ethyl 2-chloroacrylate, the 1,1' - (imino di-2, 1-ethanediyl) di (2-pyrrolidone) and the organic solvent in the step 1) is 1.12:1 (5-8); in the step 2), the mass ratio of the intermediate, the ethoxyethoxyethyl acrylate, the initiator, the isopropanol and the tartronic acid is 2:1 (0.03-0.05): 5-8): 0.5-1;
the preparation method of the modified nano titanium dioxide comprises the following steps: dispersing nano titanium dioxide in isopropanol, adding a silane coupling agent KH560, stirring and reacting for 4-6 hours at room temperature, adding polyetheramine, stirring and refluxing for reaction for 4-6 hours at 70-80 ℃, performing rotary evaporation, washing for 3-5 times by using ethanol, and drying for 10-14 hours at 75-85 ℃ in a vacuum drying oven.
2. The eco-friendly aqueous paint according to claim 1, wherein the dispersant is sodium hexametaphosphate and/or a sodium polycarboxylate salt; the defoaming agent is one or more of tributyl phosphate, a defoaming agent Demodex 3100 and a defoaming agent BYK 088; the leveling agent is one or more of a polyacrylate leveling agent, a cellulose acetate butyrate leveling agent and a polyvinyl butyral leveling agent.
3. The environment-friendly water-based paint according to claim 1, wherein the organic solvent is one or more selected from diethyl ether, dichloromethane, ethyl acetate and acetone.
4. The environment-friendly water-based paint according to claim 1, wherein the initiator is selected from one or more of azobisisobutyronitrile and azobisisoheptonitrile; the inert gas is selected from one or more of helium, neon and argon.
5. The environment-friendly water-based paint as claimed in claim 1, wherein the mass ratio of the nano titanium dioxide to the isopropanol to the silane coupling agent KH560 to the polyether amine is (3-5): (10-15):0.15: (0.3-0.5).
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