CN116023859A - Preparation method of water-based steel structure paint for protecting steel materials - Google Patents

Abstract

The invention relates to the technical field of steel paint preparation, in particular to a preparation method of a water-based steel structure paint for protecting steel materials. A method for preparing a water-based steel structure paint for protecting steel materials, comprising the following steps: preparing an acrylate resin, preparing a water-based epoxy-modified acrylate resin, adding deionized water and some additives, adding pigments and fillers to disperse and emulsify, Cold compress grinder, prepare rust preventive and add. In the present invention, by preparing the antirust agent and adding the antirust agent to the acrylate resin, the molecules of the antirust agent can form a stable bond with the steel bar and be firmly adsorbed on the metal surface, and the generated monomolecular and hydrophobic adsorption film blocks the contact of erosive ions The surface of the steel bar, thus producing good anti-rust performance, to achieve the effect of improving the anti-rust performance of water-based steel structure paint.

Description

A kind of preparation method of waterborne steel structure paint for protecting steel material

technical field

The invention relates to the technical field of steel paint preparation, in particular to a preparation method of a water-based steel structure paint for protecting steel materials.

Background technique

Water-based steel structure paint is a kind of water-based paint, with acrylic acid as the main raw material, composed of water-based resin, pigments and fillers, additives and water. Variability gives water-based acrylic paints excellent water resistance. Weather resistance, and good gloss, have great effect in the industrial and construction fields.

Water-based steel structural paint is generally coated on the surface of steel. Since water-based paint contains water, the existing water-based steel structural paint has relatively general corrosion resistance. After long-term contact with steel, it is easy to rust the steel.

Contents of the invention

In view of the above deficiencies in the prior art, the object of the present invention is to provide a method for preparing a water-based steel structural paint for protecting steel materials.

A preparation method for a water-based steel structure paint for protecting steel materials, specifically comprising the steps of:

S1: Preparation of acrylate resin

Add a mixed solution composed of methyl methacrylate, butyl acrylate, part styrene, divinylbenzene, acrylic acid and blowing agent in the reaction box equipped with temperature detector, condensing device and stirring rod. Obtain acrylate resin in;

S2: Preparation of waterborne epoxy-modified acrylate resin

Add epoxy resin 618, acrylate resin and modification accelerator to the above-mentioned reaction box to react to obtain water-based epoxy-modified acrylate resin;

S3: Add deionized water and some additives

Add 8-10 parts of deionized water, 1-2 parts of defoamer, 1-2 parts of film-forming aid, 1-2 parts of leveling agent and 1-2 parts of ammonia neutralizer into the above reaction box, and stir Rod low speed mixing 5-10min;

S4: Disperse and emulsify with pigment and filler

Add pigments and fillers, stir for 5-10 minutes at medium speed through the stirring rod, and then send it into the disperser through the conveyor, disperse for 20-30 minutes, disperse and emulsify the solution, and obtain a mixed slurry;

S5: Cold compress grinder

Apply ice to cool down the inner wall of the grinder, then apply the mixed slurry on the inner wall of the grinder, and grind it into particles of 18-50nm to obtain intermediate Ⅰ;

S6: Prepare and add antirust agent

Dissolve 1-2 parts of butyric acid, 1-2 parts of lauric acid, 1-2 parts of diethylenetriamine and 1-2 parts of triethylenetetramine in xylene solvent, mix well, and then add the mixed solution to prepare In the reaction tank, the antirust agent is obtained, and the antirust agent is added to the intermediate I to obtain the antirust mixed emulsion;

S7: Add thickening rheological additives to adjust viscosity

Add an appropriate amount of thickening rheology additive to the anti-rust mixed emulsion, adjust the viscosity of the anti-rust mixed emulsion to 90-110KU, and filter to obtain the finished water-based steel structure paint.

Further, the step S6 prepares and adds the antirust agent and specifically includes the following steps:

S6.1: Add intermediate I to the preparation reaction tank, dissolve 1-2 parts of butyric acid, 1-2 parts of lauric acid, 1-2 parts of diethylenetriamine and 1-2 parts of triethylenetetramine in xylene In the solvent, mix well, and then add the mixed solution into the preparation reaction tank;

S6.2: Infuse nitrogen gas into the preparation reaction tank through the pipeline for 2-5 minutes until the air in the preparation reaction tank is completely exhausted, then stir the liquid in the preparation reaction tank for 20-45 minutes through the stirring rod, and then heat 5-10min to 100-150°C;

S6.3: Xylene and water form an azeotropic system. A large amount of water and xylene carry a small amount of reaction solution to evaporate into gas and enter the condenser tube, liquefy into liquid through the condenser tube, then discharge the water through the water separator, and finally return to the In the preparation reaction tank, continue to react;

S6.4: After the reaction, the antirust agent is obtained. The solution in the water separator is xylene and water. The xylene is located in the upper layer of the water separator, and the water is located in the lower layer of the water separator. Separate the xylene and water, and recover the xylene reserved for secondary use;

S6.5: Take the antirust agent out of the preparation reaction tank, add it to the intermediate I, stir and mix to obtain the antirust mixed emulsion.

Further, the step S5 cold compress grinder specifically includes the following steps:

S5.1: Cool down the inner wall of the grinder by applying ice;

S5.2: apply the mixed slurry on the inner wall of the grinder;

S5.3: Add grinding aids and solvents to the grinder, and grind for 0.5-2 hours until the grinding pestle grinds the mixed slurry into particles of 18-50 nm to obtain intermediate I.

Further, the preparation of acrylate resin in the step S1 is specifically:

Add a sufficient amount of primer diluent into the reaction box equipped with a temperature detector, a condensation device, and a stirring rod, raise the temperature to 140-150°C, and slowly add 8-10 parts of methyl methacrylate and 1-2 parts of acrylic acid A mixed solution composed of butyl ester, 1-3 parts of styrene, 1-2 parts of divinylbenzene, 1-2 parts of acrylic acid and 1-3 parts of blowing agent, after the dropwise addition is completed within 5 hours, the mixed solution is mixed by a stirring rod Stir for 10-20min, wash the mixed solution with deionized water and ethanol, keep warm at 135-150°C for 1.5-2h, then evaporate at high heat, filter with suction, collect deionized water and ethanol respectively through a condensation device, and obtain acrylate resin in the reaction box .

Further, in the step S1, heat the reaction box in the step S1 by continuously heating the nitrogen to 150-160°C, and then pass the nitrogen gas into the step S6.2 to prepare the reaction tank through the insulation pipeline Heating is carried out inside, and the steps of feeding nitrogen and heating in the step S6.2 are completed to ensure the required reaction temperature in the step S6.2.

Further, the preparation of water-based epoxy-modified acrylate resin in the step S2 is specifically:

Add epoxy resin 618, acrylate resin and modification accelerator to the above reaction box, raise the temperature to 90-100°C, react for 1-2h, collect the water in the solution through a condensation device, then place it at room temperature, pass the temperature The detector detects the temperature in the reaction box, and when the temperature in the reaction box drops to 60-70°C, add neutralizing agent dimethylethanolamine to the reaction box to adjust the pH to 6-7, and then keep the water insulation for 1-1.5h to obtain Waterborne epoxy modified acrylate resin.

Further, the thickening rheology additive is an acrylic thickener.

Further, the blowing agent is azobisisobutyronitrile.

Further, the primer diluent is an aqueous solution of polyvinyl alcohol with a mass fraction of 5-10%.

Beneficial effects are: 1. The present invention prepares the antirust agent and adds the antirust agent to the acrylate resin. The molecules of the antirust agent can be stably bonded to the steel bar and firmly adsorbed on the metal surface. The resulting monomolecular and hydrophobic adsorption The film prevents corrosive ions from contacting the surface of the steel bar, thereby producing good anti-rust performance and achieving the effect of improving the anti-rust performance of water-based steel structure paint.

2. The present invention adds epoxy resin to the water-based acrylic resin. The epoxy resin also has aliphatic hydroxyl groups and ether bonds that are highly polar and difficult to hydrolyze. After film formation, it has good physical and mechanical properties and good chemical stability. The strong adhesion has achieved the effect of improving the performance of water-based steel structure paint.

3. The present invention prevents the raw materials for preparing the antirust agent from being oxidized by air in a high-temperature environment by introducing nitrogen into the device for preparing the antirust agent, ensures the concentration of the raw materials, and achieves the effect of accelerating the reaction rate.

Description of drawings

Fig. 1 is a flow chart of the preparation method of the composite cryogel based on photodynamic therapy used in the embodiment of the present invention.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Example 1

A kind of preparation method of the waterborne steel structural paint that is used to protect steel material, as shown in Figure 1, specifically comprises the steps:

S1: Preparation of acrylate resin

Add a sufficient amount of polyvinyl alcohol aqueous solution with a mass fraction of 5% into a reaction box equipped with a temperature detector, a condensation device, and a stirring rod, raise the temperature to 142°C, and slowly add 10 parts of methyl methacrylate and 1 part of acrylic acid butyl ester, 1 part of styrene, 1 part of divinylbenzene, 1 part of acrylic acid and 1 part of azobisisobutyronitrile, after the dropwise addition is completed within 5 hours, the mixed solution is stirred for 15 minutes by a stirring bar, and used Wash the mixed solution with deionized water and ethanol, keep it warm at 150°C for 2 hours, then evaporate at high temperature, filter with suction, collect deionized water and ethanol respectively through a condensation device, and obtain an acrylate resin in a reaction box.

S2: Preparation of waterborne epoxy-modified acrylate resin

Add epoxy resin 618, acrylate resin and modification accelerator to the above reaction box, raise the temperature to 90°C, react for 2 hours, collect the water in the solution through a condensation device, then place it at room temperature, and detect the reaction through a temperature detector The temperature in the box, when the temperature in the reaction box drops to 70°C, add the neutralizing agent dimethylethanolamine to the reaction box to adjust the pH to 7, and then keep it water-proof for 1 hour to obtain a water-based epoxy modified acrylate resin, epoxy The resin also has aliphatic hydroxyl and ether bonds with high polarity and is not easy to hydrolyze. After film formation, it has good chemical stability and strong adhesion, which can improve the performance of the final water-based steel structure paint.

S3: Add deionized water and some additives

Add 10 parts of deionized water, 1 part of defoamer, 1 part of film-forming aid, 1 part of leveling agent and 1 part of ammonia neutralizer into the above reaction box, and mix for 10 minutes at low speed with a stirring rod.

S4: Disperse and emulsify with pigment and filler

Add pigments and fillers, stir for 5 minutes at a medium speed through a stirring rod, and then send it into a disperser through a conveyor, disperse for 30 minutes, and disperse and emulsify the solution to obtain a mixed slurry.

S5: Cold compress grinder

S5.1: Cool down the inner wall of the grinder by ice application, so that the properties of the mixed slurry are stable and it is not easy to disintegrate during grinding;

S5.2: apply the mixed slurry on the inner wall of the grinder;

S5.3: Add grinding aid and solvent to the grinder, and grind for 1 h until the mixed slurry is ground into 20 nm particles by the grinding pestle to obtain intermediate I.

S6: Prepare and add antirust agent

S6.1: Add intermediate I into the preparation reaction tank, dissolve 1 part of butyric acid, 1 part of lauric acid, 1 part of diethylenetriamine and 1 part of triethylenetetramine in xylene solvent, mix well, and then Add the mixed solution into the preparation reaction tank;

S6.2: Infuse nitrogen gas into the preparation reaction tank through the pipeline for 5 minutes until the air in the preparation reaction tank is completely exhausted, so as to prevent the raw materials for the preparation of antirust agent from being oxidized by air in a high temperature environment, ensure the concentration of raw materials, and speed up the process. The reaction rate, then the liquid in the preparation reaction tank was stirred for 30min by the stirring rod, in the step S1, the reaction tank in the step S1 was kept warm by continuously heating the nitrogen to 150°C, and then the nitrogen was passed through The insulation pipe is passed into the preparation reaction tank for heating to achieve the effect of feeding nitrogen and heating to ensure the environment and temperature required for the reaction;

S6.3: Xylene and water form an azeotropic system. A large amount of water and xylene carry a small amount of reaction solution to evaporate into gas and enter the condenser tube, liquefy into liquid through the condenser tube, then discharge the water through the water separator, and finally return to the In the preparation reaction tank, continue to react;

S6.4: After the reaction, the antirust agent is obtained. The solution in the water separator is xylene and water. The xylene is located in the upper layer of the water separator, and the water is located in the lower layer of the water separator. Separate the xylene and water, and recover the xylene reserved for secondary use;

S6.5: Take the antirust agent out of the preparation reaction tank, add it to the intermediate I, stir and mix to obtain the antirust mixed emulsion.

S7: Add thickening rheological additives to adjust viscosity

Add an appropriate amount of acrylic thickener to the antirust mixed emulsion, adjust the viscosity of the antirust mixed emulsion to 100KU, and filter to obtain a finished water-based steel structure paint.

Example 2

A kind of preparation method of the waterborne steel structural paint that is used to protect steel material, as shown in Figure 1, specifically comprises the steps:

S1: Preparation of acrylate resin

Add a sufficient amount of polyvinyl alcohol aqueous solution with a mass fraction of 5% into a reaction box equipped with a temperature detector, a condensation device, and a stirring rod, raise the temperature to 142°C, and slowly add 8 parts of methyl methacrylate and 2 parts of acrylic acid butyl ester, 1 part of styrene, 1 part of divinylbenzene, 1 part of acrylic acid and 1 part of azobisisobutyronitrile, after the dropwise addition is completed within 5 hours, the mixed solution is stirred for 20 minutes by a stirring rod, and used Wash the mixed solution with deionized water and ethanol, keep it warm at 150°C for 2 hours, then evaporate at high temperature, filter with suction, collect deionized water and ethanol respectively through a condensation device, and obtain an acrylate resin in a reaction box.

S2: Preparation of waterborne epoxy-modified acrylate resin

Add epoxy resin 618, acrylate resin and modification accelerator to the above reaction box, raise the temperature to 90°C, react for 2 hours, collect the water in the solution through a condensation device, then place it at room temperature, and detect the reaction through a temperature detector The temperature in the box, when the temperature in the reaction box drops to 70°C, add the neutralizing agent dimethylethanolamine to the reaction box to adjust the pH to 6.5, and then keep it water-proof for 1 hour to obtain a water-based epoxy modified acrylate resin, epoxy The resin also has aliphatic hydroxyl and ether bonds with high polarity and is not easy to hydrolyze. After film formation, it has good chemical stability and strong adhesion, which can improve the performance of the final water-based steel structure paint.

S3: Add deionized water and some additives

Add 10 parts of deionized water, 1 part of defoamer, 2 parts of film-forming aid, 2 parts of leveling agent and 1 part of ammonia neutralizer into the above-mentioned reaction box, and mix for 10 minutes at low speed with a stirring rod.

S4: Disperse and emulsify with pigment and filler

Add pigments and fillers, stir for 5 minutes at a medium speed through a stirring rod, and then send it into a disperser through a conveyor, disperse for 20 minutes, and disperse and emulsify the solution to obtain a mixed slurry.

S5: Cold compress grinder

S5.1: Cool down the inner wall of the grinder by ice application, so that the properties of the mixed slurry are stable and it is not easy to disintegrate during grinding;

S5.2: apply the mixed slurry on the inner wall of the grinder;

S5.3: Add grinding aids and solvents to the grinder, and grind for 2 hours until the mixed slurry is ground into particles of 20 nm by the grinding pestle to obtain intermediate I.

S6: Prepare and add antirust agent

S6.1: Add intermediate I into the preparation reaction tank, dissolve 1 part of butyric acid, 1 part of lauric acid, 2 parts of diethylenetriamine and 2 parts of triethylenetetramine in xylene solvent, mix well, and then The mixed solution is added in the preparation reaction tank;

S6.2: Infuse nitrogen gas into the preparation reaction tank through the pipeline for 5 minutes until the air in the preparation reaction tank is completely exhausted, so as to prevent the raw materials for the preparation of antirust agent from being oxidized by air in a high temperature environment, ensure the concentration of raw materials, and speed up the process. The reaction rate, then the liquid in the preparation reaction tank was stirred for 30min by the stirring rod, in the step S1, the reaction tank in the step S1 was kept warm by continuously heating the nitrogen to 150°C, and then the nitrogen was passed through The insulation pipe is passed into the preparation reaction tank for heating to achieve the effect of feeding nitrogen and heating to ensure the environment and temperature required for the reaction;

S6.3: Xylene and water form an azeotropic system. A large amount of water and xylene carry a small amount of reaction solution to evaporate into gas and enter the condenser tube, liquefy into liquid through the condenser tube, then discharge the water through the water separator, and finally return to the In the preparation reaction tank, continue to react;

S6.4: After the reaction, the antirust agent is obtained. The solution in the water separator is xylene and water. The xylene is located in the upper layer of the water separator, and the water is located in the lower layer of the water separator. Separate the xylene and water, and recover the xylene reserved for secondary use;

S6.5: Take the antirust agent out of the preparation reaction tank, add it to the intermediate I, stir and mix to obtain the antirust mixed emulsion.

S7: Add thickening rheological additives to adjust viscosity

Add an appropriate amount of acrylic thickener to the antirust mixed emulsion, adjust the viscosity of the antirust mixed emulsion to 100KU, and filter to obtain a finished water-based steel structure paint.

Example 3

A kind of preparation method of the waterborne steel structural paint that is used to protect steel material, as shown in Figure 1, specifically comprises the steps:

S1: Preparation of acrylate resin

Add a sufficient amount of polyvinyl alcohol aqueous solution with a mass fraction of 5% into a reaction box equipped with a temperature detector, a condensation device, and a stirring rod, raise the temperature to 150°C, and slowly add 10 parts of methyl methacrylate and 1 part of acrylic acid butyl ester, 1 part of styrene, 1 part of divinylbenzene, 1 part of acrylic acid and 1 part of azobisisobutyronitrile, after the dropwise addition is completed within 5 hours, the mixed solution is stirred for 20 minutes by a stirring rod, and used Wash the mixed solution with deionized water and ethanol, keep it warm at 135°C for 2 hours, then evaporate at high temperature, filter with suction, collect deionized water and ethanol respectively through a condensation device, and obtain an acrylate resin in a reaction box.

S2: Preparation of waterborne epoxy-modified acrylate resin

Add epoxy resin 618, acrylate resin and modification accelerator to the above reaction box, raise the temperature to 90°C, react for 2 hours, collect the water in the solution through a condensation device, then place it at room temperature, and detect the reaction through a temperature detector The temperature in the box, when the temperature in the reaction box drops to 70°C, add the neutralizing agent dimethylethanolamine to the reaction box to adjust the pH to 6.5, and then keep it water-proof for 1 hour to obtain a water-based epoxy modified acrylate resin, epoxy The resin also has aliphatic hydroxyl and ether bonds with high polarity and is not easy to hydrolyze. After film formation, it has good chemical stability and strong adhesion, which can improve the performance of the final water-based steel structure paint.

S3: Add deionized water and some additives

Add 10 parts of deionized water, 1 part of defoamer, 1 part of film-forming aid, 1 part of leveling agent and 1 part of ammonia neutralizer into the above reaction box, and mix for 10 minutes at low speed with a stirring rod.

S4: Disperse and emulsify with pigment and filler

Add pigments and fillers, stir for 5 minutes at a medium speed through a stirring rod, and then send it into a disperser through a conveyor, disperse for 30 minutes, and disperse and emulsify the solution to obtain a mixed slurry.

S5: Cold compress grinder

S5.1: Cool down the inner wall of the grinder by ice application, so that the properties of the mixed slurry are stable and it is not easy to disintegrate during grinding;

S5.2: apply the mixed slurry on the inner wall of the grinder;

S5.3: Add grinding aids and solvents to the grinder, and grind for 1 h until the mixed slurry is ground into 50 nm particles by the grinding pestle to obtain intermediate I.

S6: Prepare and add antirust agent

S6.1: Add intermediate I into the preparation reaction tank, dissolve 1 part of butyric acid, 1 part of lauric acid, 1 part of diethylenetriamine and 1 part of triethylenetetramine in xylene solvent, mix well, and then The mixed solution is added in the preparation reaction tank;

S6.2: Infuse nitrogen gas into the preparation reaction tank through the pipeline for 5 minutes until the air in the preparation reaction tank is completely exhausted, so as to prevent the raw materials for the preparation of antirust agent from being oxidized by air in a high temperature environment, ensure the concentration of raw materials, and speed up the process. The reaction rate, then the liquid in the preparation reaction tank was stirred for 30min by the stirring rod, in the step S1, the reaction tank in the step S1 was kept warm by continuously heating the nitrogen gas to 160°C, and then the nitrogen gas was passed through The insulation pipe is passed into the preparation reaction tank for heating to achieve the effect of feeding nitrogen and heating to ensure the environment and temperature required for the reaction;

S6.3: Xylene and water form an azeotropic system. A large amount of water and xylene carry a small amount of reaction solution to evaporate into gas and enter the condenser tube, liquefy into liquid through the condenser tube, then discharge the water through the water separator, and finally return to the In the preparation reaction tank, continue to react;

S6.4: After the reaction, the antirust agent is obtained. The solution in the water separator is xylene and water. The xylene is located in the upper layer of the water separator, and the water is located in the lower layer of the water separator. Separate the xylene and water, and recover the xylene reserved for secondary use;

S6.5: Take the antirust agent out of the preparation reaction tank, add it to the intermediate I, stir and mix to obtain the antirust mixed emulsion.

S7: Add thickening rheological additives to adjust viscosity

Add an appropriate amount of acrylic thickener to the antirust mixed emulsion, adjust the viscosity of the antirust mixed emulsion to 100KU, and filter to obtain a finished water-based steel structure paint.

The above-mentioned embodiments only illustrate the principles and effects of the present invention, but are not intended to limit the present invention. Anyone skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical ideas disclosed in the present invention should still be covered by the claims of the present invention.

Claims (9)

1. The preparation method of the water-based steel structure paint for protecting the steel material is characterized by comprising the following steps of:

s1: preparation of acrylate resins

Adding a mixed solution consisting of methyl methacrylate, butyl acrylate, styrene, divinylbenzene, acrylic acid and a foaming agent into a reaction box provided with a temperature detector, a condensing device and a stirring rod, and obtaining acrylic ester resin in the reaction box;

s2: preparation of aqueous epoxy modified acrylate resins

Adding epoxy resin 618 into the reaction box, and reacting the acrylic resin with a modification accelerator to obtain water-based epoxy modified acrylic resin;

s3: adding deionized water and partial auxiliary agent

Adding 8-10 parts of deionized water, 1-2 parts of defoamer, 1-2 parts of film forming auxiliary agent, 1-2 parts of flatting agent and 1-2 parts of ammonia neutralizer into the reaction box, and mixing at a low speed for 5-10min through a stirring rod;

s4: pigment and filler adding dispersion emulsification

Adding pigment and filler, stirring at medium speed for 5-10min by a stirring rod, then conveying into a dispersing machine by a conveyor, dispersing for 20-30min, and dispersing and emulsifying the solution to obtain mixed slurry;

s5: cold compress grinding machine

Cooling the inner wall of a grinding machine by ice compress, and then applying the mixed slurry on the inner wall of the grinding machine, grinding into particles of 18-50nm to obtain an intermediate I;

s6: preparing antirust agent and adding

Dissolving 1-2 parts of butyric acid, 1-2 parts of lauric acid, 1-2 parts of diethylenetriamine and 1-2 parts of triethylenetetramine in a xylene solvent, uniformly mixing, adding the mixed solution into a preparation reaction tank to obtain an antirust agent, and adding the antirust agent into the intermediate I to obtain an antirust mixed emulsion;

s7: viscosity is regulated by adding thickening rheological auxiliary agent

And adding a proper amount of thickening rheological additive into the antirust mixed emulsion, adjusting the viscosity of the antirust mixed emulsion to 90-110KU, and filtering to obtain a finished product of the water-based steel structure paint.

2. The method for preparing the aqueous steel structural paint for protecting steel materials according to claim 1, wherein the step S6 is to prepare an antirust agent and add the aqueous steel structural paint specifically comprises the following steps:

s6.1: adding the intermediate I into a preparation reaction tank, dissolving 1-2 parts of butyric acid, 1-2 parts of lauric acid, 1-2 parts of diethylenetriamine and 1-2 parts of triethylenetetramine into a xylene solvent, uniformly mixing, and adding the mixed solution into the preparation reaction tank;

s6.2: introducing nitrogen into the preparation reaction tank through a pipeline for 2-5min until air in the preparation reaction tank is completely discharged, stirring liquid in the preparation reaction tank for 20-45min through a stirring rod, and then heating for 5-10min to 100-150 ℃;

s6.3: the xylene and water form an azeotropic system, a large amount of water and the xylene carry a small amount of reaction solution to be evaporated into gas, the gas enters a condensing pipe, the gas is liquefied into liquid through the condensing pipe, the water is discharged through a water separator, and finally the liquid returns to a preparation reaction tank through a bent pipe to continue the reaction;

s6.4: after the reaction is finished, an antirust agent is obtained, the solution in the water separator is dimethylbenzene and water, the dimethylbenzene is positioned at the upper layer of the water separator, the water is positioned at the lower layer of the water separator, the dimethylbenzene and the water are separated, and the dimethylbenzene is recovered for secondary use;

s6.5: and taking the antirust agent out of the preparation reaction tank, adding the antirust agent into the intermediate I, and stirring and uniformly mixing to obtain the antirust mixed emulsion.

3. The method for preparing the water-based steel structural paint for protecting steel materials according to claim 1, wherein the step S5 cold compress grinder specifically comprises the following steps:

s5.1: cooling the inner wall of the grinding machine through ice compress;

s5.2: applying the mixed slurry to the inner wall of the grinder;

s5.3: grinding aid and solvent are added into a grinder, grinding is carried out for 0.5-2h until a grinding pestle grinds the mixed slurry into particles of 18-50nm, and the intermediate I is obtained.

4. The method for preparing the water-based steel structural paint for protecting steel materials according to claim 2, wherein the step S1 of preparing the acrylic resin is specifically:

adding enough priming diluent into a reaction box provided with a temperature detector, a condensing device and a stirring rod, heating to 140-150 ℃, slowly dripping a mixed solution consisting of 8-10 parts of methyl methacrylate, 1-2 parts of butyl acrylate, 1-3 parts of styrene, 1-2 parts of divinylbenzene, 1-2 parts of acrylic acid and 1-3 parts of foaming agent, stirring the mixed solution for 10-20min by the stirring rod after the dripping is finished, washing the mixed solution by deionized water and ethanol, preserving the temperature for 1.5-2h at 135-150 ℃, then evaporating at high temperature, filtering, collecting deionized water and ethanol respectively by the condensing device, and obtaining the acrylic resin in the reaction box.

5. The method for preparing the water-based steel structural paint for protecting steel materials according to claim 4, wherein in the step S1, nitrogen is continuously heated to 150-160 ℃ to keep the temperature of the reaction tank in the step S1, then the nitrogen is introduced into the preparation reaction tank in the step S6.2 through a heat-insulating pipeline to heat, and the steps of introducing nitrogen and heating in the step S6.2 are completed, so that the reaction temperature required in the step S6.2 is ensured.

6. The method for preparing the water-based steel structural paint for protecting steel materials according to claim 1, wherein the preparation of the water-based epoxy modified acrylate resin in the step S2 is specifically:

adding epoxy resin 618, acrylic resin and a modification accelerator into the reaction box, heating to 90-100 ℃, reacting for 1-2h, collecting water in the solution through a condensing device, then placing the solution in a room temperature environment, detecting the temperature in the reaction box through a temperature detector, adding a neutralizing agent dimethylethanolamine into the reaction box to regulate ph to 6-7 when the temperature in the reaction box is reduced to 60-70 ℃, and then insulating water for 1-1.5h to obtain the waterborne epoxy modified acrylic resin.

7. The method for preparing an aqueous steel structural paint for protecting steel materials according to claim 1, wherein the thickening rheological aid is an acrylic thickener.

8. The method for preparing an aqueous steel structural paint for protecting steel materials according to claim 4, wherein the foaming agent is azobisisobutyronitrile.

9. The method for preparing the water-based steel structure paint for protecting steel materials according to claim 4, wherein the primer thinner is a polyvinyl alcohol aqueous solution with the mass fraction of 5-10%.

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