阅读说明：本技术 一种重防腐水性漆及其制备方法和应用 (Heavy-duty anticorrosive water-based paint and preparation method and application thereof ) 是由 史学斌 于 2021-09-01 设计创作，主要内容包括：本发明提供了一种重防腐水性漆及其制备方法和应用,属于水性漆技术领域。本发明提供的重防腐水性漆中,改性丙烯酸树脂能够决定漆膜的化学干燥性,并提高漆膜的耐水性；含氟共聚物的引入能够使水性漆具有优异的耐候性以及耐热和耐腐蚀等性能；本发明通过在水性漆中引入改性石墨烯,阻隔水和氧等腐蚀因子渗透到涂层与基底界面破坏基底与涂层的结合力,同时使其适应于更加复杂的基底表面,增加了本发明底漆与基底的结合力,与所述第一助剂协同作用,使漆膜具有更好的封闭性能。填料的引入,能够使其与改性石墨烯之间协同作用,保证水性漆与基材之间的附着力。实施例结果表明,本发明提供的重防腐水性漆与基体附着力好,具有优异的耐腐蚀性。(The invention provides a heavy-duty anticorrosive water-based paint and a preparation method and application thereof, belonging to the technical field of water-based paints. In the heavy-duty anticorrosive water-based paint provided by the invention, the modified acrylic resin can determine the chemical drying property of a paint film and improve the water resistance of the paint film; the introduction of the fluorine-containing copolymer can enable the water paint to have excellent weather resistance, heat resistance, corrosion resistance and other properties; according to the invention, the modified graphene is introduced into the water-based paint, so that water, oxygen and other corrosion factors are prevented from permeating into the interface between the coating and the substrate to damage the bonding force between the substrate and the coating, and meanwhile, the water-based paint is suitable for the surface of a more complex substrate, so that the bonding force between the primer and the substrate is increased, and the water-based paint and the first auxiliary agent have a synergistic effect, so that a paint film has better sealing performance. Due to the introduction of the filler, the filler and the modified graphene can have a synergistic effect, and the adhesive force between the water-based paint and the base material is ensured. The results of the examples show that the heavy-duty anticorrosive water-based paint provided by the invention has good adhesion with a substrate and excellent corrosion resistance.)

1. The heavy-duty anticorrosive water-based paint is prepared from the following components in parts by weight:

2. the heavy-duty water-based paint according to claim 1, wherein the modified acrylic resin is a polyester-modified hydroxy acrylic resin.

3. The heavy-duty aqueous paint according to claim 1, characterized in that the fluorine-containing copolymer is a copolymer of a polyfluoroalkyl alcohol (meth) acrylic acid derivative and a polysiloxane having a terminal (meth) acryloyloxy group.

4. The heavy-duty aqueous paint as claimed in claim 3, wherein the chemical formula of the polyfluoroalkyl alcohol (meth) acrylic acid derivative is: c_nF_2n+1(CH₂CF₂)_a(CF₂CF₂)_b(CH₂CH₂)_cOCOCR＝CH₂(ii) a Wherein R is a hydrogen atom or a methyl group, n is an integer of 1 to 6, a is an integer of 1 to 4, b is an integer of 1 to 3, and c is an integer of 1 to 3.

5. The heavy-duty water-based paint according to claim 1, wherein the preparation method of the surface-modified graphene comprises the following steps: and mixing the surfactant, salicylic acid and the graphene dispersion liquid for modification to obtain the modified graphene.

6. The heavy-duty water-based paint as claimed in claim 5, wherein the surfactant is one or more of sodium dodecyl sulfate, sodium dodecyl benzene sulfonate and sodium alkyl naphthalene sulfonate.

7. The heavy-duty aqueous paint according to claim 1, wherein the auxiliary agent comprises one or more of an anti-settling agent, a color-developing agent, a leveling agent, and an antifoaming agent.

8. The preparation method of the heavy-duty water-based paint as claimed in any one of claims 1 to 7, comprising the steps of:

(1) mixing modified acrylic resin, fluorine-containing copolymer, modified graphene, filler, plasticizer, dispersant, tackifier, auxiliary agent and anti-aging agent to obtain first slurry;

(2) mixing the first slurry obtained in the step (1) with an initiator to perform a polymerization reaction to obtain a second slurry;

(3) mixing the second slurry obtained in the step (2) with deionized water to obtain a third slurry;

(4) filtering the third slurry obtained in the step (3), and cooling the solid obtained by filtering to room temperature to obtain a water-based resin;

(5) mixing the water-based resin obtained in the step (4) with a deflocculating pigment and a wetting agent to obtain a fourth slurry;

(6) and (5) grinding the fourth slurry obtained in the step (5) to obtain the heavy-duty anticorrosive water-based paint.

9. The method according to claim 8, wherein the polymerization reaction in the step (2) is carried out at a temperature of 85 to 105 ℃.

10. The method according to claim 8, wherein the temperature of the filtration in the step (4) is 65 ℃.

Technical Field

The invention relates to the technical field of water-based paint, in particular to heavy-duty water-based paint and a preparation method and application thereof.

Background

A large amount of volatile organic compounds contained in the traditional solvent-based paint not only can cause serious pollution to the atmosphere, but also can seriously affect the health of human beings. Today, environmental awareness is increasing, and environmental friendly paints are increasingly showing their importance. Compared with the traditional paint, the water-based paint does not contain carcinogens such as benzene, toluene, xylene and the like, thereby effectively ensuring the personal health of workshop production personnel.

In the prior art, water-based paint and a preparation method thereof are widely reported, for example, Chinese patent document with application number 201710929152.3 reports a water-based heavy-duty finish paint and a preparation method thereof, and the water-based heavy-duty finish paint consists of the following raw materials: 15-20 parts of water-based polyester acrylic resin; 10-20 parts of filling pigment; 0.1-0.5 part of wetting dispersant; 40-60 parts of deionized water; 0.1-0.5 part of adhesion promoter; 5-10 parts of a second auxiliary agent; 1-5 parts of a thickening agent. This method requires the addition of adhesion promoters to improve the adhesion of the aqueous paint to the substrate. Chinese patent document with application number 201510066224.7 reports a heavy-duty anticorrosive two-component water-based epoxy zinc-rich primer and a preparation method thereof, the primer prepared by the method can play the electrochemical protection role only because zinc powder in the primer is in close contact with steel, and the requirement on the surface treatment of a substrate is strict so as to ensure the adhesive force between the water-based paint and the substrate; in addition, zinc rich primers are generally thin and cannot be used alone.

Therefore, it is highly desirable to provide a corrosion-resistant water-based paint with good adhesion to the substrate.

Disclosure of Invention

The invention aims to provide a heavy-duty anticorrosive water-based paint which has good adhesion with a substrate and is corrosion-resistant, and a preparation method and application thereof.

In order to achieve the above object, the present invention provides the following technical solutions:

the invention provides a heavy-duty anticorrosive water-based paint which is obtained by polymerizing the following components in parts by weight:

preferably, the modified acrylic resin is a polyester-modified hydroxy acrylic resin.

Preferably, the fluorine-containing copolymer is a copolymer of a polyfluoroalkyl alcohol (meth) acrylic acid derivative and a polysiloxane having a terminal (meth) acryloyloxy group.

Preferably, the polyfluoroalkyl alcohol (meth) acrylic acid derivative has the general chemical formula: c_nF_2n+1(CH₂CF₂)_a(CF₂CF₂)_b(CH₂CH₂)_cOCOCR＝CH₂(ii) a Wherein R is a hydrogen atom or a methyl group, n is an integer of 1 to 6, a is an integer of 1 to 4, b is an integer of 1 to 3, and c is an integer of 1 to 3.

Preferably, the preparation method of the surface-modified graphene comprises the following steps: and mixing the surfactant, salicylic acid and the graphene dispersion liquid for modification to obtain the modified graphene.

Preferably, the surfactant is one or more of sodium dodecyl sulfate, sodium dodecyl sulfonate, sodium dodecyl benzene sulfonate and sodium alkyl naphthalene sulfonate.

Preferably, the auxiliary agent comprises one or more of an anti-settling agent, a vehicle, a leveling agent and an antifoaming agent.

The invention also provides a preparation method of the heavy-duty anticorrosive water-based paint, which comprises the following steps:

(1) mixing modified acrylic resin, fluorine-containing copolymer, modified graphene, filler, plasticizer, dispersant, tackifier, auxiliary agent and anti-aging agent to obtain first slurry;

(2) mixing the first slurry obtained in the step (1) with an initiator to perform a polymerization reaction to obtain a second slurry;

(3) mixing the second slurry obtained in the step (2) with deionized water to obtain a third slurry;

(4) filtering the third slurry obtained in the step (3), and cooling the solid obtained by filtering to room temperature to obtain a water-based resin;

(5) mixing the water-based resin obtained in the step (4) with a deflocculating pigment and a wetting agent to obtain a fourth slurry;

(6) and (5) grinding the fourth slurry obtained in the step (5) to obtain the heavy-duty anticorrosive water-based paint.

Preferably, the temperature of the polymerization reaction in the step (2) is 85 ℃ to 105 ℃.

Preferably, the temperature of the filtration in the step (4) is 65 ℃.

The invention provides a heavy-duty anticorrosive water-based paint which is obtained by polymerizing the following components in parts by weight: 10.0-30.0 parts of modified acrylic resin; 1.0-5.0 parts of a fluorine-containing copolymer; 1.0-3.0 parts of modified graphene; 1.0-3.0 parts of filler; 0.5-3 parts of a plasticizer; 0.01-0.50 parts of a dispersing agent; 0.01-0.50 part of tackifier; 1.0-5.0 parts of an anti-aging agent; 0.05-0.50 part of an initiator; 0.5-2.50 parts of an oxidant; 0.05-0.1 part of deflocculating pigment; 0.05-0.5 part of wetting agent; 0-10 parts of an auxiliary agent; 15.0-20.0 parts of deionized water. In the heavy-duty anticorrosive water-based paint provided by the invention, the modified acrylic resin can determine the chemical drying property of a paint film and improve the water resistance of the paint film; the introduction of the fluorine-containing copolymer can lead the water paint to have excellent light retention, color retention, weather resistance, heat resistance, corrosion resistance, chemical resistance, stain resistance, friction resistance and other properties; according to the invention, the modified graphene is introduced into the water-based paint, so that water, oxygen and other corrosion factors are prevented from permeating into the interface between the coating and the substrate to damage the bonding force between the substrate and the coating, and meanwhile, the water-based paint is suitable for the surface of a more complex substrate, the bonding force between the primer and the substrate is increased, and the water-based paint and the first auxiliary agent have a synergistic effect, so that a paint film has better sealing performance; due to the introduction of the filler, the filler and the modified graphene can have a synergistic effect, and the adhesive force between the water-based paint and the base material is ensured. The example result shows that the adhesion force of the heavy-duty anticorrosive water-based paint provided by the invention to a substrate is grade 1, and the heavy-duty water-based paint has excellent corrosion resistance.

Detailed Description

The invention provides a heavy-duty anticorrosive water-based paint which is obtained by polymerizing the following components in parts by weight:

the raw materials for preparing the heavy-duty anticorrosive water-based paint comprise, by weight, 10.0-30.0 parts of modified acrylic resin, preferably 15.0-25.0 parts, and more preferably 20.0-25.0 parts. In the present invention, the modified acrylic resin is preferably a polyester-modified hydroxy acrylic resin. In the invention, the polyester modified hydroxy acrylic resin has hydroxyl, and on one hand, the reaction with other components in the water paint can determine the chemical drying property of a paint film; on the other hand, the wetting dispersibility of the pigment is influenced, and the paint film is resistant to water, chemicals and the like, so that the corrosion resistance of the water-based paint can be improved.

The raw materials for preparing the heavy-duty anticorrosive water-based paint comprise 1.0-5.0 parts of fluorine-containing copolymer, preferably 2.0-4.0 parts, and more preferably 3.0-4.0 parts by weight of modified acrylic resin accounting for 10.0-30.0 parts by weight of the modified acrylic resin. In the invention, fluorine atoms in the fluorine-containing copolymer have the highest electronegativity and the smallest atomic radius except hydrogen atoms, so that the fluorine-containing copolymer has extremely high stability, and the addition of the fluorine-containing copolymer into raw materials for preparing the modified acrylic resin can enable the heavy-duty anticorrosive water-based paint to have excellent performances such as weather resistance, corrosion resistance, chemical resistance, stain resistance, friction resistance and the like.

In the present invention, the fluorine-containing copolymer is a copolymer of a polyfluoroalkyl alcohol (meth) acrylic acid derivative and a polysiloxane having a terminal (meth) acryloyloxy group. In the present invention, the chemical general formula of the polyfluoroalkyl alcohol (meth) acrylic acid derivative is preferably: c_nF_2n+1(CH₂CF₂)_a(CF₂CF₂)_b(CH₂CH₂)_cOCOCR＝CH₂(ii) a Wherein R is a hydrogen atom or a methyl group, n is preferably an integer of 1 to 6, more preferably an integer of 2 to 5; a is preferably an integer of 1 to 4, more preferably an integer of 2 to 3; b is preferably an integer of 1 to 3, more preferably an integer of 2 to 3; c is preferably an integer of 1 to 3, more preferably an integer of 2 to 3And (4) counting. When the polyfluoroalkyl alcohol (meth) acrylic acid derivative is of the above type, the corrosion resistance of the heavy-duty anticorrosive water-based paint can be improved.

The source of the polysiloxane having a terminal (meth) acryloyloxy group in the present invention is not particularly limited, and commercially available products known to those skilled in the art may be used. In the present invention, when the polysiloxane having a terminal (meth) acryloyloxy group is of the above type, it is more advantageous to improve the corrosion resistance of the heavy-duty aqueous paint.

In the present invention, the mass ratio of the polyfluoroalkyl alcohol (meth) acrylic acid derivative to the (meth) acryloyloxy group having a terminal in the fluorocopolymer is preferably (1 to 99): (99 to 1), and more preferably (50 to 99): (99 to 50). In the present invention, when the mass ratio of the polyfluoroalkyl alcohol (meth) acrylic acid derivative to the (meth) acryloyloxy group having a terminal is in the above range, the weight average molecular weight of the resulting fluorine-containing copolymer is preferably 10000 to 1000000, more preferably 100000 to 1000000. In the present invention, the fluorocopolymer is preferably CF₃(CF₂)₃(CH₂CF₂)(CF₂CF₂)(CH₂CH₂)OCOCH＝CH₂、CF₃(CF₂)₃(CH₂CF₂)(CF₂CF₂)₂(CH₂CH₂)OCOCH＝CH₂Or CF₃(CF₂)₃(CH₂CF₂)(CF₂CF₂)₂(CH₂CH₂)OCOC(CH₃)＝CH₂. In the invention, when the fluorine-containing copolymer is in the molecular weight range and the specific type, the corrosion resistance of the heavy-duty anticorrosive water-based paint is improved.

The raw materials for preparing the heavy-duty anticorrosive water-based paint comprise 1.0-3.0 parts of modified graphene, preferably 2.0-2.5 parts of modified graphene by weight part of 10.0-30.0 parts of modified acrylic resin. In the invention, the modified graphene is added in the water-based paint, and can prevent corrosion factors such as water, oxygen and the like from permeating into the interface between the coating and the substrate to damage the bonding force between the substrate and the coating, so that the water-based paint is suitable for the more complicated substrate surface, the bonding force between the water-based paint and the substrate is increased, the paint film has better sealing performance, and the service life of the paint film is prolonged.

In the present invention, the method for preparing the surface-modified graphene preferably includes: and mixing the surfactant, salicylic acid and the graphene dispersion liquid for modification to obtain the modified graphene.

In the present invention, the surfactant is preferably one or more of sodium lauryl sulfate, sodium lauryl sulfonate, sodium dodecylbenzenesulfonate and sodium alkylnaphthalenesulfonate. In the invention, when the surfactant is of the type mentioned above, graphene can be fully dispersed, which is more beneficial to fully reacting with salicylic acid.

In the present invention, the graphene dispersion preferably includes graphene and deionized water.

In the invention, the mass ratio of the surfactant, the salicylic acid, the graphene and the deionized water is preferably (1-2): 10-15): 0.8-1.2): 5-10, and more preferably (1-2): 12-14): 1.0-1.2): 6-8. In the invention, when the mass ratio of the surfactant to the salicylic acid to the graphene and the deionized water is in the above range, the graphene can be fully modified, so that the modified graphene is more beneficial to improving the binding force between the water-based paint and the substrate.

The operation method for mixing the surfactant and the salicylic acid with the graphene dispersion liquid is not particularly limited, and a mixing mode known by a person skilled in the art can be adopted.

In the present invention, the mixing is preferably stirring. The stirring speed is not particularly limited, and the components can be uniformly mixed. In the invention, the stirring time is preferably 30-60 min, and more preferably 40-60 min. In the present invention, the modification occurs during the stirring, and when the stirring time is in the above range, the graphene can be sufficiently modified.

The raw materials for preparing the heavy-duty anticorrosive water-based paint comprise 1.0-3.0 parts of filler, preferably 1.5-2.0 parts of filler, by weight of 10.0-30.0 parts of modified acrylic resin. In the present invention, the filler is preferably zinc powder. In the invention, when the filler is zinc powder, the coating has electrochemical protection performance; the addition of the modified graphene can change the assembly structure of resin, improve the degree of order, and simultaneously the nanoscale graphene can reduce the structural defects of the coating and improve the permeability resistance of the coating; according to the water-based epoxy coating, the modified graphene and the filler are added simultaneously, so that the coating has shielding and electrochemical dual-protection performances, and the corrosion resistance of the water-based epoxy coating is further improved.

The raw materials for preparing the heavy-duty anticorrosive water-based paint comprise 0.5-3 parts of plasticizer, preferably 1-2 parts by weight of modified acrylic resin accounting for 10.0-30.0 parts by weight of the modified acrylic resin. The kind of the plasticizer is not particularly limited in the present invention, and a plasticizer known to those skilled in the art may be used. In the present invention, the plasticizer is preferably glycidyl versatate. In the present invention, the plasticizer can increase the plasticity of the aqueous paint.

The raw materials for preparing the heavy-duty anticorrosive water-based paint comprise 0.01-0.50 part of dispersant, preferably 0.10-0.40 part, and more preferably 0.20-0.40 part by weight of modified acrylic resin accounting for 10.0-30.0 parts by weight of the modified acrylic resin. In the invention, the dispersant is preferably one or more of 4-hydroxybenzophenone, diphenylcresol and phenoxyacetic acid. In the invention, when the dispersant is the type mentioned above, the raw materials of the heavy-duty anticorrosive water-based paint can be uniformly mixed.

The raw materials for preparing the heavy-duty anticorrosive water-based paint comprise 0.01-0.50 part of tackifier, preferably 0.10-0.40 part, and more preferably 0.20-0.40 part by weight of modified acrylic resin accounting for 10.0-30.0 parts by weight of modified acrylic resin. In the invention, the tackifier is preferably one or more of methyltrichlorosilicon, tetramethoxysilane, tetraethoxysilane and methyltrimethoxysilane. In the invention, the tackifier can improve the viscosity of the water-based paint, is more favorable for tightly combining the water-based paint with the substrate, and can further improve the binding force between the water-based paint and the substrate when the tackifier is of the type mentioned above.

The raw materials for preparing the heavy-duty anticorrosive water-based paint comprise 1.0-5.0 parts of age resister, preferably 2.0-4.0 parts by weight of modified acrylic resin accounting for 10.0-30.0 parts by weight of the modified acrylic resin. In the present invention, the anti-aging agent is preferably one or more of sodium phytate and zinc phytate. In the invention, the anti-aging agent can improve the anti-aging property of the water-based paint and prolong the service life of the water-based paint.

The raw materials for preparing the heavy-duty anticorrosive water-based paint comprise 0.05-0.50 parts of initiator, preferably 0.10-0.40 parts of modified acrylic resin by weight parts of 10.0-30.0 parts of initiator. In the present invention, the initiator is preferably cumene hydroperoxide or tert-butyl hydroperoxide. In the present invention, the initiator is capable of initiating radical polymerization and copolymerization of the acrylic resin, and when the initiator is of the above type, the polymerization is more facilitated.

The raw materials for preparing the heavy-duty anticorrosive water-based paint comprise 0.5-2.50 parts of oxidant, preferably 1.5-2.0 parts by weight of modified acrylic resin accounting for 10.0-30.0 parts by weight of the modified acrylic resin. In the present invention, the oxidizing agent can promote the polymerization reaction. In the present invention, the oxidizing agent is preferably potassium persulfate.

The raw materials for preparing the heavy-duty anticorrosive water-based paint comprise 0.05-0.10 part of deflocculating pigment by weight of 10.0-30.0 parts of modified acrylic resin. In the present invention, the deflocculating pigment is preferably titanium dioxide. In the present invention, the deflocculating pigment has deflocculation properties that help prevent flocculation of the aqueous paint.

The raw materials for preparing the heavy-duty anticorrosive water-based paint comprise 0.05-0.5 part of wetting agent, preferably 0.10-0.40 part, and more preferably 0.20-0.40 part by weight of modified acrylic resin accounting for 10.0-30.0 parts by weight of the modified acrylic resin. In the present invention, the wetting agent is preferably a nonionic surfactant. The source of the wetting agent is not particularly limited in the present invention, and commercially available products well known to those skilled in the art may be used. In the present invention, the wetting agent is preferably a wetting agent HY-352 or HY-1608A. In the invention, the wetting agent can improve the surface tension and permeability of the water paint, so that the water paint can better wet a substrate, thereby improving the adhesion of the paint, particularly the adhesion of a primer to the substrate.

The raw materials for preparing the heavy-duty anticorrosive water-based paint comprise 0-10.0 parts of auxiliary agent, preferably 5-10.0 parts by weight of modified acrylic resin accounting for 10.0-30.0 parts by weight of modified acrylic resin. In the present invention, the auxiliary agent preferably includes one or more of an anti-settling agent, a color-developing agent, a leveling agent, and an antifoaming agent. The dosage of each component in the auxiliary agent is not specially limited, and the auxiliary agent can be added according to the requirement.

In the heavy-duty anticorrosive water-based paint provided by the invention, the modified acrylic resin can determine the chemical drying property of a paint film and improve the water resistance of the paint film; the introduction of the fluorine-containing copolymer can lead the water paint to have excellent light retention, color retention, weather resistance, heat resistance, corrosion resistance, chemical resistance, stain resistance, friction resistance and other properties; according to the invention, the modified graphene is introduced into the water-based paint, so that water, oxygen and other corrosion factors are prevented from permeating into the interface between the coating and the substrate to damage the bonding force between the substrate and the coating, and meanwhile, the water-based paint is suitable for the surface of a more complex substrate, the bonding force between the primer and the substrate is increased, and the water-based paint and the first auxiliary agent have a synergistic effect, so that a paint film has better sealing performance; due to the introduction of the filler, the filler and the modified graphene can have a synergistic effect, and the adhesive force between the water-based paint and the base material is ensured.

The invention also provides a preparation method of the heavy-duty anticorrosive water-based paint, which comprises the following steps:

(1) mixing modified acrylic resin, fluorine-containing copolymer, modified graphene, filler, plasticizer, dispersant, tackifier, auxiliary agent and anti-aging agent to obtain first slurry;

(2) mixing the first slurry obtained in the step (1) with an initiator to perform a polymerization reaction to obtain a second slurry;

(3) mixing the second slurry obtained in the step (2) with deionized water to obtain a third slurry;

(4) filtering the third slurry obtained in the step (3), and cooling the solid obtained by filtering to room temperature to obtain a water-based resin;

(5) mixing the water-based resin obtained in the step (4) with a deflocculating pigment and a wetting agent to obtain a fourth slurry;

(6) and (5) grinding the fourth slurry obtained in the step (5) to obtain the heavy-duty anticorrosive water-based paint.

According to the invention, modified acrylic resin, fluorine-containing copolymer, modified graphene, filler, plasticizer, dispersant, tackifier, auxiliary agent and anti-aging agent are mixed to obtain first slurry. The operation method for mixing the modified acrylic resin, the fluorine-containing copolymer, the modified graphene, the filler, the plasticizer, the dispersant, the tackifier and the anti-aging agent is not particularly limited, and the components can be uniformly mixed.

After the first slurry is obtained, the first slurry and an initiator are mixed for polymerization reaction to obtain a second slurry.

The operation method for mixing the first slurry and the initiator is not particularly limited, and the components can be uniformly mixed.

In the present invention, the temperature of the polymerization reaction is preferably 85 to 105 ℃, more preferably 90 to 100 ℃; the time of the polymerization reaction is preferably 30 to 60min, and more preferably 40 to 50 min. In the present invention, when the temperature and time of the polymerization reaction are within the above ranges, the polymerization reaction can be promoted sufficiently to form a polymer.

After the second slurry is obtained, the second slurry is mixed with deionized water to obtain a third slurry. The method for mixing the second slurry and the deionized water is not particularly limited, and the second slurry and the deionized water can be uniformly mixed. In the invention, the second slurry is mixed with deionized water, preferably at 60-70 ℃, and more preferably at 65 ℃. In the invention, when the second slurry and the deionized water are mixed to the temperature, the second slurry is diluted by water, so that the obtained mixed solution is more beneficial to subsequent filtration.

After the third slurry is obtained, filtering the third slurry, and cooling the solid obtained by filtering to room temperature to obtain the water-based resin. The operation method of the filtration is not particularly limited in the present invention, and a filtration method known to those skilled in the art may be used to separate solid from liquid. In the present invention, the temperature of the filtration is preferably 65 ℃. In the present invention, the filtration temperature is 65 ℃ to sufficiently separate the aqueous resin from the third slurry.

After obtaining the water-based resin, the invention mixes the water-based resin with the deflocculating pigment and the wetting agent to obtain a fourth slurry. The operation method for mixing the water-based resin, the deflocculating pigment and the wetting agent is not particularly limited, and the components can be uniformly mixed.

After the fourth slurry is obtained, the fourth slurry is ground to obtain the heavy-duty anticorrosive water-based paint.

In the invention, the grinding can ensure the fineness of the water-based paint, so that the water-based paint has a flat plane after being attached to the surface of the base material. The method of operation of the polishing in the present invention is not particularly limited, and a polishing method known to those skilled in the art may be used. In the invention, the fineness of the solid particles of the polymer in the fourth slurry after grinding is preferably 5 to 10 μm, and more preferably 6 to 80 μm. In the present invention, when the fineness of the solid particles of the polymer in the fourth slurry after grinding is in the above range, the flatness of the water-based paint adhering to the surface of the substrate can be improved.

In the invention, the fourth slurry is preferably ground and then mixed with the auxiliary agent, and the operation method for grinding and then mixing the fourth slurry with the auxiliary agent is not particularly limited, and the components can be uniformly mixed.

The preparation method provided by the invention can fully react the raw materials of the heavy-duty anticorrosive water-based paint, and the heavy-duty anticorrosive water-based paint with uniform components and excellent dispersion stability is obtained.

The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

A heavy-duty anticorrosive water-based paint is obtained by polymerizing the following components in parts by weight:

polyester-modified hydroxyacrylic resin 15 parts, fluorine-containing Copolymer (CF)₃(CF₂)₃(CH₂CF₂)(CF₂CF₂)(CH₂CH₂)OCOCH＝CH₂)2.0 parts of modified graphene and 2.0 parts of modified graphene; 2.0 parts of filler (zinc powder), 3 parts of plasticizer (glycidyl versatate), 0.02 part of dispersing agent (4-hydroxybenzophenone), 0.04 part of tackifier (methyltrichlorosilane), 1.0 part of anti-aging agent (sodium phytate), 0.20 part of initiator (cumene hydroperoxide), 0.5 part of oxidant (potassium persulfate) and 0.05 part of anti-flocculation pigment (titanium dioxide); wetting agent HY-3520.05 parts; 16.0 parts of deionized water.

The preparation method of the modified graphene comprises the following steps: weighing the raw materials according to the weight ratio, adding deionized water and graphene into a container, starting ultrasonic coupling stirring for dispersion operation, continuously stirring, dropwise adding a surfactant and salicylic acid into the reaction container, and stirring for 30min to obtain surfactant modified graphene; the water-based paint comprises a surfactant, graphene, salicylic acid and deionized water in a weight ratio of 1: 10: 0.8: 5.

the preparation method of the heavy-duty anticorrosive water-based paint comprises the following steps:

(1) mixing modified acrylic resin, fluorine-containing copolymer, modified graphene, filler, plasticizer, dispersant, tackifier, auxiliary agent and anti-aging agent to obtain first slurry;

(2) mixing the first slurry obtained in the step (1) with an initiator, reacting at 90 ℃ for 40min, and carrying out polymerization reaction to obtain a second slurry;

(3) mixing the second slurry obtained in the step (2) with deionized water, wherein the mixing temperature is 65 ℃ to obtain a third slurry;

(4) filtering the third slurry obtained in the step (3), and cooling the solid obtained by filtering to room temperature to obtain a water-based resin;

(5) mixing the water-based resin obtained in the step (4) with a deflocculating pigment and a wetting agent to obtain a fourth slurry;

(6) and (4) grinding the fourth slurry obtained in the step (5), and then filling the product.

Example 2

A heavy-duty anticorrosive water-based paint is obtained by polymerizing the following components in parts by weight:

20 parts of polyester-modified hydroxy acrylic resin and fluorine-containing Copolymer (CF)₃(CF₂)₃(CH₂CF₂)(CF₂CF₂)₂(CH₂CH₂)OCOCH＝CH₂)2.0 parts of modified graphene and 1.0 part of modified graphene; 1.0 part of filler (zinc powder), 2 parts of plasticizer (glycidyl versatate), 0.10 part of dispersing agent (4-hydroxybenzophenone), 0.04 part of tackifier (methyltrichlorosilane), 1.0 part of anti-aging agent (sodium phytate), 0.20 part of initiator (cumene hydroperoxide), 0.2 part of oxidant (potassium persulfate) and 0.10 part of deflocculating pigment (titanium dioxide); wetting agent HY-3520.10 parts; and 17.0 parts of deionized water.

The preparation method of the modified graphene and the preparation method of the heavy-duty anticorrosive water-based paint are the same as those in example 1.

Example 3

A heavy-duty anticorrosive water-based paint is obtained by polymerizing the following components in parts by weight:

25 parts of polyester-modified hydroxy acrylic resin and fluorine-containing Copolymer (CF)₃(CF₂)₃(CH₂CF₂)(CF₂CF₂)₂(CH₂CH₂)OCOC(CH₃)＝CH₂)3.0 parts of modified graphene and 3.0 parts of modified graphene; 2.0 parts of filler (zinc powder), 3.0 parts of plasticizer (glycidyl versatate), 0.40 part of dispersing agent (4-hydroxybenzophenone), 0.3 part of tackifier (methyl trichloro silicon), 2.0 parts of anti-aging agent (sodium phytate), 0.40 part of initiator (isopropyl benzene hydroperoxide), 1.0 part of oxidant (potassium persulfate), 0.10 part of anti-flocculation pigment (titanium dioxide), HY-3520.40 parts of wetting agent, 2 parts of auxiliary agent (anti-settling agent) and 20.0 parts of deionized water.

The preparation method of the modified graphene and the preparation method of the heavy-duty anticorrosive water-based paint are different from those in example 1 in that in the step (6), the fourth slurry obtained in the step (5) is ground, then the ground slurry is mixed with the auxiliary agent, and the rest steps are the same as those in example 1.

Test example

The water-based paint prepared in each example is detected by adopting a relevant national standard method, and the result is as follows:

performance test results of the Water-based paints of examples 1 to 3

As can be seen from the table above, on one hand, the water-based paint has the advantages of high drying speed, no sagging, hardness of 3H and good adhesive force; on one hand, the corrosion-resistant water-based paint has better solvent resistance, aging resistance, salt spray resistance, good weather resistance and excellent corrosion resistance, and is corrosion-resistant water-based paint with better performance.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.