CN111500148A - A kind of functional heavy-duty anti-corrosion water-based paint for steel based on graphene modification and preparation method and use method thereof - Google Patents

Abstract

The invention discloses graphene-modified functional heavy-duty anticorrosive water-based paint for steel and a preparation method thereof. The epoxy resin composite primer is composed of water-based epoxy resin, graphene, a dispersing agent, a diluent, an epoxy curing agent and the like, the fluorocarbon composite finish paint is composed of fluorocarbon finish paint, graphene, a dispersing agent, a diluent, an antibacterial agent, a fluorocarbon curing agent and the like, the fluorocarbon metal varnish is composed of fluorocarbon paint, metal powder, a diluent, a fluorocarbon curing agent and the like, the performances of the epoxy resin composite primer, the fluorocarbon composite finish paint and the fluorocarbon metal varnish are mutually supplemented and associated, and the formed heavy anti-corrosion coating improves the corrosion resistance of the base material. The graphene functional coating disclosed by the invention has multiple functions of corrosion resistance, heat conduction, bacteriostasis, flame retardance, oil repellency, hydrophobicity and the like, is wide in application field, simple in preparation method and easy for large-scale production and implementation.

Description

A kind of functional heavy-duty anti-corrosion water-based coating for steel based on graphene modification and preparation thereof how to use

technical field

The invention relates to a graphene-modified functional heavy-duty anti-corrosion water-based paint for steel, a preparation method and a use method thereof, and belongs to the field of paints.

Background technique

Metal corrosion will cause waste of resources and energy. It is estimated that the economic loss caused by metal corrosion in China accounts for about 4% of the gross national product every year, and the problem of corrosion protection is imminent. However, foreign companies occupy more than 60% of the domestic anti-corrosion coating market share, and the development of domestic anti-corrosion coating technology needs to be improved. Especially in the field of heavy corrosion protection. Heavy-duty anti-corrosion coatings are suitable for chemical atmospheres and marine environments. However, most of the existing heavy-duty anti-corrosion coatings have a single function, while the chemical atmosphere and marine environment are changeable. The changeable environment is prone to breed various problems, such as bacteria and fire. Therefore, in order to achieve protection against various problems, different coatings need to be applied. The mixed use of these different coatings not only consumes manpower and material resources, but also reduces its own effect, so that the equipment cannot be protected for a long time. In order to achieve comprehensive anti-corrosion of equipment, it is extremely necessary to develop functional comprehensive heavy-duty anti-corrosion composite coatings.

SUMMARY OF THE INVENTION

The invention aims to provide a graphene-modified functional heavy-duty anti-corrosion water-based paint for steel and a preparation method thereof, including an epoxy resin composite primer with anti-corrosion and thermal conductivity functions, and a fluorocarbon composite surface with anti-corrosion and antibacterial functions. It is a fluorocarbon metal varnish with anti-corrosion, flame-retardant, oil-repellent and water-repellent functions, suitable for metal protection.

Another object of the present invention is to provide a method for using the functional heavy-duty anti-corrosion coating composed of epoxy resin composite primer, fluorocarbon composite topcoat and fluorocarbon metal varnish.

In order to realize the above-mentioned purpose of the invention, the technical scheme adopted in the present invention includes:

The invention provides a functional heavy-duty water-based anti-corrosion coating for steel based on graphene modification, the heavy-duty anti-corrosion water coating is composed of epoxy resin composite primer, fluorocarbon composite topcoat and fluorocarbon metal varnish.

Further, the epoxy resin composite primer is composed of waterborne epoxy resin, graphene, dispersant, diluent, epoxy curing agent, etc. The prepared waterborne epoxy resin has excellent anticorrosion and thermal conductivity.

Further, the epoxy resin composite primer coating composition is calculated as follows by weight: 100 parts of epoxy resin, 0.3 to 1 part of graphene, 0.1 to 0.2 part of dispersant, 1 to 10 parts of thinner, and 30 parts of epoxy curing agent.

Further, the epoxy resin is a water-based epoxy resin.

Further, the graphene is graphene oxide, and the mass ratio of the graphene and the epoxy resin is 3-10:1000.

Further, the dispersant is polyvinyl alcohol, and its molecular weight is 16,000-200,000. Functional modification of polyvinyl alcohol and graphene through π-π bonds enables the formed modified graphene to maintain extremely high dispersibility and electrical conductivity in solvents.

Further, the diluent is water.

Further, the epoxy curing agent is an amine curing agent.

Further, the preparation method of the epoxy resin composite primer coating: 3-10 parts of the graphene slurry and the polyvinyl alcohol solution are mixed and stirred for 24 h to form a mixture. The mixture was slowly dropped into 1000 parts of epoxy resin solution, and a mixture was formed after stirring for 24 h. Slowly drop 300 parts of epoxy curing agent into the mixture and cure for 15 min to form epoxy resin composite primer coating.

Further, the fluorocarbon composite topcoat is composed of a fluorocarbon topcoat, graphene, a dispersant, a thinner, an antibacterial agent, a fluorocarbon curing agent, and the like, and the prepared fluorocarbon composite topcoat has anti-corrosion and antibacterial properties.

Further, the composition of the fluorocarbon composite topcoat is calculated as follows by weight: 100 parts of fluorocarbon topcoat, 0.3 to 0.5 parts of graphene, 0.06 to 0.1 part of dispersant, 80 to 100 parts of thinner, and 3 to 5 parts of antibacterial agent, 20 parts of fluorocarbon curing agent.

Further, the antibacterial agent includes nano-titanium dioxide.

Further, the preparation method of the fluorocarbon composite topcoat paint: the fluorocarbon topcoat and the thinner are mixed uniformly to form a fluorocarbon diluted mixture for use. After 3-5 parts of graphene slurry and polyvinyl alcohol solution were mixed and stirred for 24 h, a mixture was formed. The mixture was slowly dropped into 1000 parts of the fluorocarbon diluted mixture, and a mixture was formed after stirring for 24 h. Then the quantitative antibacterial agent is added to the mixture and mixed evenly. Slowly drop 200 parts of fluorocarbon curing agent into the mixture and cure for 15 min to form a fluorocarbon composite topcoat.

Further, the fluorocarbon metal varnish is composed of fluorocarbon paint, metal powder, diluent, and fluorocarbon curing agent, and the prepared fluorocarbon composite varnish has anticorrosion, flame retardant, oil-repellent and water-repellent properties.

Further, the composition of the fluorocarbon composite topcoat is calculated as follows by weight: 100 parts of fluorocarbon varnish, 1 to 3 parts of metal powder, 30 to 60 parts of thinner, and 20 parts of fluorocarbon curing agent.

Further, the metal powder includes aluminum powder, magnesium hydroxide, and aluminum hydroxide, or a mixture thereof.

Further, the preparation method of the fluorocarbon metal varnish coating: mix 100 parts of fluorocarbon paint and 30-60 parts of thinner evenly, and pass through a 200-target vertebral sieve. Mix 1-3 parts of metal powder with fluorocarbon diluted paint and stir for 24 h to form a mixture. Slowly drop 20 parts of fluorocarbon curing agent into the mixture and cure for 15 min to form a fluorocarbon metal varnish coating.

Further, the use method of the functional heavy-duty anti-corrosion water-based paint for steel based on graphene modification: surface treatment of anti-corrosion substrate, rust and oil removal. Then spray the epoxy resin composite primer coating prepared by the above method, the coating thickness is about 30~50 μm, and dry at room temperature for 48 h; then spray the fluorocarbon composite topcoat coating prepared by the above method, the coating thickness is about 20~ 30 μm, dried at room temperature for 48 h; finally, the fluorocarbon varnish coating prepared by the above method was sprayed with a coating thickness of about 10-20 μm, and after drying for 48 h, a functional heavy-duty anti-corrosion water based on graphene-modified steel was obtained. coating.

Beneficial effects of the present invention:

(1) Using water-based paint and water-based curing agent to reduce environmental pollution, it is an environment-friendly paint.

(2) The addition of modified graphene to the epoxy resin composite primer and the fluorocarbon composite topcoat can form a "maze effect" to block the contact between the external environment and the equipment.

(3) The π-π bond functional modification of polyvinyl alcohol and graphene improves the dispersibility of modified graphene-like in water, and the dosage of dispersant is very low, and the modification operation is simple and effective.

(4) Graphene is densely dispersed, which not only improves the anti-corrosion effect of the coating, but also has flame-retardant and fire-resistant properties.

(5) The graphene used in the present invention is a graphene-like, the preparation process is simple, and the cost is low.

(6) The graphene heavy-duty anti-corrosion water-based coating provided by the present invention not only retains the main characteristics of each component, but also improves various properties of the coating through the composite effect. Applicable.

Description of drawings

Fig. 1 is the spraying effect of the functional heavy-duty anti-corrosion water-based paint for steel based on graphene modification obtained in Example 2 of the present invention.

Detailed ways

The present invention is further illustrated by the following examples, but is not limited to the following examples.

Example 1:

The invention provides a preparation method of a graphene-modified functional heavy-duty anti-corrosion water-based paint for steel, so as to overcome the deficiencies in the prior art. The graphene anticorrosion functional coating is composed of epoxy resin composite primer, fluorocarbon composite topcoat and fluorocarbon metal varnish.

The technical solutions of the present invention will be further described and described below through specific examples.

Example 1:

The present embodiment provides a 0.3% graphene-modified functional heavy-duty water-based anti-corrosion coating for steel and a large-scale preparation method thereof, which specifically includes the following steps:

Weigh in parts by weight 100 parts of epoxy resin, 0.3 part of graphene, 0.1 part of dispersant, 3 parts of thinner, and 30 parts of epoxy curing agent.

Dissolve 0.1 part of polyvinyl alcohol dispersant in 1 part of diluent, stir and heat at 90° C. until the polyvinyl alcohol dissolves, and set aside. Dissolve 0.3 parts of graphene in 3 parts of diluent, disperse evenly by ultrasonic, add polyvinyl alcohol solution, stir, and ultrasonicate until graphene is uniformly dispersed in the diluent. So far, the modified graphene slurry is obtained.

Add 100 parts of epoxy resin to the above graphene slurry in proportion, mix it evenly with a homogenizer, and add a diluent according to its viscosity. So far, 0.3% graphene epoxy primer slurry was obtained, which was evenly used for later use.

Weigh 30 parts of epoxy curing agent in proportion and slowly add it to the above-mentioned mixture. After 15 minutes of curing, it can be applied to the treated equipment substrate by spraying or brushing. After curing at room temperature, graphite can be obtained. Anti-corrosion functionalized epoxy composite primer coating.

Weigh 100 parts of fluorocarbon topcoat, 0.3 part of graphene, 0.06 part of dispersant, 80 parts of thinner, 3 parts of antibacterial agent and 20 parts of fluorocarbon curing agent by weight.

Dissolve 0.06 part of polyvinyl alcohol dispersant in 1 part of diluent, stir and heat at 90° C. until the polyvinyl alcohol dissolves, and set aside. Dissolve 0.3 parts of graphene in 80 parts of diluent, disperse uniformly by ultrasonic, add the above polyvinyl alcohol solution, stir, and ultrasonicate until graphene is uniformly dispersed in the diluent. So far, the modified graphene slurry is obtained.

Pass 100 parts of fluorocarbon topcoat through a standard sieve. Add 0.3 parts of modified graphene slurry and antibacterial agent, mix them evenly with a homogenizer, and add a diluent according to its viscosity. Spare evenly.

Weigh 20 parts of fluorocarbon topcoat curing agent in proportion, slowly add it to the above-formed mixture, and after 15 minutes of curing, it can be applied to the equipment containing epoxy composite primer coating by spraying or brushing Graphene anti-corrosion functionalized fluorocarbon composite topcoat can be obtained by curing at room temperature.

Weigh 100 parts of fluorocarbon varnish, 1 part of metal powder, 30 parts of thinner and 20 parts of fluorocarbon curing agent by weight.

Pass 100 parts of fluorocarbon varnish through a standard sieve. Mix 1 part of metal powder with fluorocarbon paint, use a homogenizer to mix it evenly, and add 30 parts of thinner according to its viscosity. Spare evenly.

Weigh 20 parts of fluorocarbon varnish curing agent in proportion, slowly add it to the above-formed mixture, and after 15 minutes of curing, it can be applied to the epoxy-containing composite primer and the fluorocarbon composite surface by spraying or brushing On the equipment of paint, the graphene anti-corrosion functionalized coating can be obtained by curing at room temperature.

1 serving in the present invention represents 1 g.

Example 2:

The present embodiment 2 provides a functional heavy-duty water-based anti-corrosion coating for steel based on 0.5% graphene modification and a large-scale preparation method thereof, which specifically includes the following steps:

Weigh in parts by weight 100 parts of epoxy resin, 0.5 part of graphene, 0.2 part of dispersant, 5 parts of thinner, and 30 parts of epoxy curing agent.

Dissolve 0.2 part of the polyvinyl alcohol dispersant in a quantitative diluent, stir and heat at 90° C. until the polyvinyl alcohol dissolves, and set aside. Dissolve 0.5 part of graphene in 5 parts of diluent, disperse evenly by ultrasonic, add 0.2 part of polyvinyl alcohol solution, stir, and ultrasonicate until graphene is uniformly dispersed in the diluent. So far, the modified graphene slurry is obtained.

Add 100 parts of epoxy resin to 0.5 part of modified graphene slurry in proportion, use a homogenizer to mix it evenly, and add a diluent according to its viscosity. Spare evenly.

30 parts of epoxy curing agent were weighed in proportion, slowly added to the above-formed mixture, and cured for 15 min to obtain an epoxy resin primer coating. It can be applied to the treated equipment substrate by spraying or brushing, and cured at room temperature to obtain a graphene anti-corrosion functionalized epoxy composite primer coating.

Weigh 100 parts of fluorocarbon topcoat, 0.4 part of graphene, 0.08 part of dispersant, 90 parts of thinner, 4 parts of antibacterial agent, and 20 parts of fluorocarbon curing agent by weight.

Dissolve 0.08 part of polyvinyl alcohol dispersant in 1 part of diluent, stir and heat at 90° C. until the polyvinyl alcohol dissolves, and set aside. Dissolve 0.4 parts of graphene in 90 parts of diluent, disperse evenly by ultrasonic, add 0.08 part of polyvinyl alcohol solution, stir, and ultrasonicate until graphene is uniformly dispersed in the diluent. So far, the modified graphene slurry is obtained.

Pass 100 parts of fluorocarbon paint through a standard sieve. The modified graphene slurry and antibacterial agent are added in a certain proportion, mixed evenly by a homogenizer, and a diluent is added according to its viscosity. Spare evenly.

Weigh 20 parts of fluorocarbon curing agent in proportion, slowly add it to the above-mentioned mixture, and after 15 minutes of curing, it can be applied to the equipment containing epoxy composite primer coating by spraying or brushing. Graphene anti-corrosion functionalized fluorocarbon composite topcoat can be obtained by curing at room temperature.

Weigh 100 parts of fluorocarbon varnish, 2 parts of metal powder, 45 parts of thinner and 20 parts of fluorocarbon curing agent by weight.

Pass 100 parts of fluorocarbon paint through a standard sieve. Mix 2 parts of metal powder with fluorocarbon paint, mix them evenly with a homogenizer, and add diluent according to its viscosity. Spare evenly.

Weigh 20 parts of fluorocarbon curing agent in proportion, slowly add it to the above-formed mixture, and after 15 minutes of curing, it can be applied to epoxy-containing composite primer and fluorocarbon composite topcoat by spraying or brushing Graphene anti-corrosion functionalized coating can be obtained by curing at room temperature.

The detection item of embodiment 2 and its detection result

Table 1

Example 3:

The present embodiment 3 provides a functional heavy-duty anti-corrosion water-based coating for steel based on 1% graphene modification and a large-scale preparation method thereof, which specifically includes the following steps:

Weigh in parts by weight 100 parts of epoxy resin, 1 part of graphene, 0.3 part of dispersant, 10 parts of thinner, and 30 parts of epoxy curing agent.

Dissolve 0.3 part of the polyvinyl alcohol dispersant in a quantitative diluent, stir and heat at 90° C. until the polyvinyl alcohol dissolves, and set aside. Dissolve 1 part of graphene in 10 parts of diluent, disperse evenly by ultrasonic, add 0.3 part of polyvinyl alcohol solution, stir, and ultrasonicate until graphene is uniformly dispersed in the diluent. So far, the modified graphene slurry is obtained.

Add 100 parts of epoxy resin to the modified graphene slurry in proportion, mix it evenly with a homogenizer, and add a diluent according to its viscosity. Spare evenly.

Weigh 30 parts of epoxy curing agent in proportion and slowly add it to the above-mentioned mixture. After 15 minutes of curing, it can be applied to the treated equipment substrate by spraying or brushing. After curing at room temperature, graphite can be obtained. Anti-corrosion functionalized epoxy composite primer coating.

Weigh 100 parts of fluorocarbon topcoat, 0.5 part of graphene, 0.1 part of dispersant, 100 parts of thinner, 5 parts of antibacterial agent and 20 parts of fluorocarbon curing agent by weight.

Dissolve 0.1 part of the polyvinyl alcohol dispersant in a quantitative diluent, stir and heat at 90° C. until the polyvinyl alcohol dissolves, and set aside. Dissolve 0.5 part of graphene in 100 parts of diluent, disperse evenly by ultrasonic, add 0.1 part of polyvinyl alcohol solution, stir, and ultrasonicate until graphene is uniformly dispersed in the diluent. So far, the modified graphene slurry is obtained.

Pass 100 parts of fluorocarbon paint through a standard sieve. The modified graphene slurry and the antibacterial agent are added in a certain proportion, mixed evenly by a homogenizer, and a diluent is added according to its viscosity. Spare evenly.

Weigh 20 parts of fluorocarbon curing agent in proportion, slowly add it to the above-mentioned mixture, and after 15 minutes of curing, it can be applied to the equipment containing epoxy composite primer coating by spraying or brushing. Graphene anti-corrosion functionalized fluorocarbon composite topcoat can be obtained by curing at room temperature.

Weigh 100 parts of fluorocarbon varnish, 3 parts of metal powder, 60 parts of thinner and 20 parts of fluorocarbon curing agent by weight.

Pass 100 parts of fluorocarbon paint through a standard sieve. Mix 3 parts of metal powder with fluorocarbon paint, use a homogenizer to mix them evenly, and add diluent according to its viscosity. Spare evenly.

Weigh 20 parts of fluorocarbon curing agent in proportion, slowly add it to the above-formed mixture, and after 15 minutes of curing, it can be applied to epoxy-containing composite primer and fluorocarbon composite topcoat by spraying or brushing Graphene anti-corrosion functionalized coating can be obtained by curing at room temperature.

Comparative Example 1: It is basically the same as Example 1, but neither the epoxy composite primer nor the fluorocarbon composite topcoat is added with modified graphene.

According to the preparation method of Example 1, the non-modified graphene epoxy composite primer, the non-modified graphene fluorocarbon composite topcoat, and the fluorocarbon metal varnish were coated on the stainless steel of 300 mm × 300 mm in turn, and the coating Thickness ≥ 5 mm. The thermal conductivity experiment was carried out according to Table 1, and the results showed that the thermal conductivity of the graphene-containing functional coating was much greater than that of the graphene-free coating. Each individual coating of Example 1 and Comparative Example 1 were tested in turn by using the hundred grid method. The results showed that each individual coating of Comparative Example 1 could reach grade 0, and that of Example 1 and Example 2 could also reach grade 0. , Example 3 can reach 1 level.

Comparative Example 2: It is basically the same as Example 1, but no modified graphene is added to the fluorocarbon composite topcoat.

According to the preparation method of Example 1, the modified graphene epoxy composite primer, the non-modified graphene fluorocarbon composite topcoat, and the fluorocarbon metal varnish were sequentially coated on the stainless steel of 300 mm × 300 mm, and the coating thickness was ≥5mm. The thermal conductivity experiment was carried out according to Table 1, and the results showed that the thermal conductivity of the graphene-containing functional coating was greater than that of the graphene-free coating. Each individual coating of Example and Comparative Example 2 was tested in turn by using the hundred grid method. Oxygen composite primer coating up to level 1. Examples 1 and 2 can reach grade 0, and embodiment 3 can reach grade 1.

Comparative Example 3: It is basically the same as Example 1, but no modified graphene is added to the epoxy composite primer.

According to the preparation method of Example 1, the non-modified graphene epoxy composite primer, the modified graphene fluorocarbon composite topcoat, and the fluorocarbon metal varnish were sequentially coated on the stainless steel of 300 mm × 300 mm, and the coating thickness was ≥5mm. The thermal conductivity experiment was carried out according to Table 1, and the results showed that the thermal conductivity of the graphene-containing functional coating was greater than that of the graphene-free coating. Each individual coating of Example and Comparative Example 3 was tested in turn by using the hundred grid method. The results showed that the unmodified graphene epoxy composite primer coating in Comparative Example 3 can reach grade 0, and the modified graphene fluorine can reach grade 0. Carbon composite topcoat finishes up to level 1. Embodiments 1 and 2 can also reach grade 0, and embodiment 3 can reach grade 1.

Comparative Example 4: The coating preparation method was similar to Example 2. Graphene is directly dispersed without modification. Compared with the examples, the practice of Comparative Example 4 is likely to cause graphene agglomeration, and the salt spray resistance test is used to compare, the results show that the salt spray resistance time of Comparative Example 4 is only 200 h, and there are phenomena such as bubbling and rust spots. Comparatively speaking, the salt spray resistance effect of the example is good, and the salt spray resistance test of example 2 can reach more than 1000 h.

Claims (9)

1. The functional heavy-duty anticorrosive water-based paint based on graphene modification for steel is characterized by comprising the following components in parts by weight: the heavy-duty anticorrosive water-based paint consists of an epoxy resin composite primer, a fluorocarbon composite finish and a fluorocarbon metal varnish;

the epoxy resin composite primer is composed of water-based epoxy resin, graphene, a dispersing agent, a diluent and an epoxy curing agent, and the prepared water-based epoxy resin has excellent corrosion resistance and heat conductivity;

the fluorocarbon composite finish paint consists of fluorocarbon finish paint, graphene, a dispersing agent, a diluent, an antibacterial agent and a fluorocarbon curing agent, and the prepared fluorocarbon composite finish paint has the performances of corrosion prevention and bacteriostasis;

the fluorocarbon metal varnish consists of fluorocarbon paint, metal powder, diluent and fluorocarbon curing agent, and the prepared fluorocarbon composite varnish has the performances of corrosion resistance, flame retardance, oil repellency and hydrophobicity.

2. The graphene-modified functional heavy-duty water-based paint for steel products according to claim 1, wherein: the epoxy resin composite primer coating comprises the following components in parts by weight: 100 parts of water-based epoxy resin, 0.3-1 part of graphene, 0.1-0.2 part of dispersant, 1-10 parts of diluent and 30 parts of epoxy curing agent.

3. The graphene-modified functional heavy-duty water-based paint for steel products according to claim 2, wherein: the graphene is graphene oxide, and the mass ratio of the graphene to the water-based epoxy resin is 3-10: 1000;

the dispersing agent is polyvinyl alcohol, and the molecular weight of the dispersing agent is 16000-200000;

the diluent is water;

the epoxy curing agent is an amine curing agent;

the amine curing agent comprises a polyamide curing agent.

4. The graphene-modified functional heavy-duty water-based paint for steel products according to claim 1, wherein: the fluorocarbon composite finish paint comprises the following components in parts by weight: 100 parts of fluorocarbon finish, 0.3-0.5 part of graphene, 0.06-0.1 part of dispersing agent, 80-100 parts of diluent, 3-5 parts of antibacterial agent and 20 parts of fluorocarbon curing agent.

5. The graphene-modified functional heavy-duty water-based paint for steel products according to claim 4, wherein: the graphene is graphene oxide, the dispersing agent is polyvinyl alcohol, and the molecular weight of the dispersing agent is 16000-200000; the diluent is water; the antibacterial agent comprises nano titanium dioxide; the fluorocarbon curing agent is a water-based isocyanate curing agent.

6. The graphene-modified functional heavy-duty water-based paint for steel products according to claim 1, wherein: the fluorocarbon composite clear coating comprises the following components in percentage by weight: 100 parts of fluorocarbon varnish, 1-3 parts of metal powder, 30-60 parts of diluent and 20 parts of fluorocarbon curing agent.

7. The graphene-modified functional heavy-duty water-based paint for steel products according to claim 6, wherein: the metal powder comprises one or a mixture of aluminum powder, magnesium hydroxide and aluminum hydroxide; the fluorocarbon curing agent is a water-based isocyanate curing agent.

8. The preparation method of the functional heavy-duty water-based paint for graphene-modified steel products, which is based on any one of claims 1 to 7, is characterized by comprising the following steps:

the preparation method of the epoxy resin composite primer coating comprises the following steps: mixing and stirring 3-10 parts of graphene slurry and 1-2 parts of polyvinyl alcohol solution for 24 hours to form a mixture; slowly dropping the mixture into 1000 parts of epoxy resin solution, and stirring for 24 hours to form a mixture; slowly dripping 300 parts of epoxy curing agent into the mixture, curing for 15 min to form the epoxy resin composite primer coating;

the preparation method of the fluorocarbon composite finish paint comprises the following steps: uniformly mixing the fluorocarbon finish paint and a diluent to form a fluorocarbon diluted mixture for later use; mixing and stirring 3-5 parts of graphene slurry and a polyvinyl alcohol solution for 24 hours to form a mixture; slowly dripping the mixture into 1000 parts of fluorocarbon diluted mixture, and stirring for 24 hours to form a mixture; then adding 30-50 parts of an antibacterial agent into the mixture and uniformly mixing; slowly dripping 200 parts of fluorocarbon curing agent into the mixture, curing for 15 min to form fluorocarbon composite finish paint;

the preparation method of the fluorocarbon metal varnish coating comprises the following steps: uniformly mixing 100 parts of fluorocarbon paint and 30-60 parts of diluent, and sieving with a 200-target cone sieve; mixing and stirring 1-3 parts of metal powder and fluorocarbon diluted paint for 24 hours to form a mixture; and slowly dripping 20 parts of fluorocarbon curing agent into the mixture, and curing for 15 min to form the fluorocarbon metal varnish coating.

9. The use method of the functional heavy-duty water-based paint for graphene-modified steel products, which is set forth in any one of claims 1 to 7, is characterized in that:

performing surface treatment on the anticorrosive base material, and removing rust and oil; then spraying the epoxy resin composite primer coating, wherein the thickness of the coating is 30-50 mu m, and drying at room temperature for 48 h; then spraying the fluorocarbon composite finish paint, wherein the thickness of the coating is 20-30 mu m, and drying for 48 h at room temperature; and finally, spraying the fluorocarbon varnish coating, wherein the thickness of the coating is 10-20 microns, and drying for 48 hours to obtain the functional heavy-duty anticorrosive water-based coating for the steel based on graphene modification.

Images