Graphene modified heavy-duty anticorrosive material and application thereof

Abstract

The application provides a graphene modified heavy anticorrosive material and application thereof, and relates to the technical field of anticorrosive materials.The graphene modified heavy anticorrosive material comprises graphene modified inorganic zinc-rich primer, epoxy sealing paint with a solid content of 50%-70%, epoxy cloud iron intermediate paint with a solid content of 50%-70% and polysiloxane topcoat arranged on the surface of a body to be anticorrosive in sequence, wherein all powder materials in the inorganic zinc-rich primer, the epoxy sealing paint, the epoxy cloud iron intermediate paint and the polysiloxane topcoat are subjected to silane modification treatment, and the inorganic zinc-rich primer, the epoxy sealing paint and the epoxy cloud iron intermediate paint all contain rare earth chelating agents.The graphene modified heavy anticorrosive material has low VOCs, excellent salt fog resistance, aging resistance and wear resistance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of anticorrosive materials, in particular to a graphene modified heavy-duty anticorrosive material and application thereof. BACKGROUND

[0002] Steel structures such as bridges, pipelines or storage tanks are often damaged by oxidation, corrosion, fatigue and other factors, causing economic and safety losses. Therefore, anticorrosion technology is crucial for the long-term use and maintenance of steel structures such as bridges, pipelines or storage tanks. Traditional anticorrosion methods usually use organic solvents containing VOCs (volatile organic compounds) to coat heavy-duty anticorrosive coatings, which have certain anticorrosion effect, but these chemicals can cause serious harm to the environment and human health, therefore, there is an urgent need for a heavy-duty anticorrosive material that meets the anticorrosion requirements and is low-cost, environmentally friendly and long-lasting. SUMMARY

[0003] The problem solved by the present application is that the existing heavy-duty anticorrosive coating contains volatile organic compounds, which can cause serious harm to the environment and human health, and is high in cost and short in service life.

[0004] To solve the above problems, the present application provides a graphene modified heavy-duty anticorrosive material, which comprises a graphene modified inorganic zinc-rich primer, an epoxy sealing paint with a solid content of 50%-70%, an epoxy iron oxide intermediate paint with a solid content of 50%-70% and a polysiloxane topcoat arranged on the surface of a body to be protected in sequence, wherein all the powder materials in the inorganic zinc-rich primer, the epoxy sealing paint, the epoxy iron oxide intermediate paint and the polysiloxane topcoat are subjected to silane modification treatment, and the inorganic zinc-rich primer, the epoxy sealing paint and the epoxy iron oxide intermediate paint all contain a rare earth chelating agent.

[0005] Optionally, the method of silane modification treatment comprises: adding the powder material into deionized water and ultrasonically cleaning for 25-35 minutes, then adding into an ethanol solution of a silane coupling agent with a mass fraction of 5%, sealing and placing on a magnetic stirrer at a constant temperature of 80℃ for continuous stirring for 2.5-3.5 hours, and then obtaining the modified powder material after suction filtration, washing and drying to a constant weight.

[0006] Optionally, the silane coupling agent comprises one of methyltrimethoxysilane, phenyltrimethoxysilane, methyltriethoxysilane, ethyltrimethoxysilane and ethyltriethoxysilane.

[0007] Optionally, the weight composition of the inorganic zinc-rich primer comprises: tetraethyl orthosilicate 20%, water 3%, propylene glycol methyl ether 7%, phosphorus iron powder 5-7%, titanium oxide 2%, silicon carbide 1%, iron blue powder 3%, boron nitride 2%, polyvinyl butyral 2%, REC-1 type rare earth ytterbium chelate 0.1-0.5%, REC-2 type rare earth yttrium chelate 0.1-0.5%, modified graphene 0.5-3%, zinc powder 62.5-67.8%, zinc chloride 0.5%, stannous chloride 0.5%, and silver nitrate 1%.

[0008] Optionally, the preparation method of the modified graphene comprises: ultrasonic cleaning graphene in ethanol for 25-35 minutes, dispersing in DMF solvent, ultrasonic stirring for 10-20 minutes to obtain a dispersion, adding 5% mass fraction of siloxane coupling agent to the dispersion, stirring and heating to 90-100℃ for 3 hours, and then centrifuging and washing to obtain siloxane modified graphene.

[0009] Optionally, the weight composition of the epoxy sealing paint comprises: epoxy resin 50%, aluminum oxide 5-20%, flaky titanium oxide 1-5%, iron oxide 5-10%, DMP-30 accelerator 1.5%, active diluent 2-8%, polyamide curing agent 25-27%, REC-1 type rare earth ytterbium chelate 0.1-0.5%, and REC-2 type rare earth yttrium chelate 0.1-0.5%.

[0010] Optionally, the weight composition of the epoxy iron blue intermediate paint comprises: epoxy resin 30-40%, iron blue powder 10-20%, talc powder 7%, aluminum oxide 7-10%, precipitated barium sulfate 3-5%, iron oxide 5-7%, DMP-30 accelerator 1.5%, active diluent 2-5%, polyamide curing agent 20-22%, REC-1 type rare earth ytterbium chelate 0.1-0.5%, and REC-2 type rare earth yttrium chelate 0.1-0.5%.

[0011] Optionally, the weight composition of the polysiloxane topcoat comprises: polysiloxane resin 40%, silicone-modified acrylic resin 30%, isocyanate crosslinking agent 15%, glass microbeads 2%, titanium oxide 13%, flaky titanium oxide 2%, mica powder 2%, boron nitride powder 2%, modified graphene 0.1-1%, propylene glycol methyl ether 4%, isopropyl alcohol 4%, and ethanol 3%.

[0012] Optionally, the thickness of the inorganic zinc-rich primer is 74-76μm, the thickness of the epoxy sealing paint is 64-66μm, the thickness of the epoxy iron blue intermediate paint is 119-121μm, and the thickness of the polysiloxane topcoat is 119-121μm.

[0013] Compared with the prior art, the graphene modified heavy-duty anticorrosive material comprises an inorganic zinc-rich primer modified by graphene, a high solid content epoxy sealing paint, a high solid content epoxy cloud iron intermediate paint and a polysiloxane topcoat, wherein the zinc powder content is reduced by adding the modified graphene in the inorganic zinc-rich primer, which not only reduces the cost, but also significantly improves the strength, hardness and wear resistance of the heavy-duty anticorrosive coating, and prolongs the service life of the coating. In addition, combined with the rare earth chelating agent, the entire graphene modified heavy-duty anticorrosive material can complex the ferrous ions generated by rust in time, and form a hard, dense and not easy to fall off protective layer on the surface of the steel structure, effectively preventing the steel structure from being eroded and damaged by factors such as atmosphere, water and soil, and prolonging the service life of the steel structure. In addition, all the powder materials in the inorganic zinc-rich primer, the epoxy sealing paint, the epoxy cloud iron intermediate paint and the polysiloxane topcoat are subjected to silane modification treatment, which reduces the oil absorption and greatly reduces the emission of harmful gases, meets the modern environmental protection requirements, and has a wide application prospect.

[0014] To solve the above problems, the application further provides an application of the graphene modified heavy-duty anticorrosive material, specifically, the graphene modified heavy-duty anticorrosive material is coated on the surface of a steel structure building, a pipeline or a storage tank for corrosion protection.

[0015] The application of the graphene modified heavy-duty anticorrosive material has the same advantages as the graphene modified heavy-duty anticorrosive material relative to the prior art, and will not be described here. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 The graphene modified heavy-duty anticorrosive material is a structure schematic view in the embodiments of the application.

[0017] BRIEF DESCRIPTION OF DRAWINGS

[0018] 1-inorganic zinc-rich primer, 2-epoxy sealing paint, 3-epoxy cloud iron intermediate paint, 4-polysiloxane topcoat. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings.

[0020] The description of the term "some embodiments" means that the specific features, structures, materials or characteristics described in combination with the embodiments or examples are included in at least one embodiment or example of the application. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0021] As Figure 1As shown, the embodiment of the present application provides a graphene modified heavy-duty anticorrosive material, which comprises graphene modified inorganic zinc-rich primer 1, epoxy sealing paint 2 with solid content of 50%-70%, epoxy cloud iron intermediate paint 3 with solid content of 50%-70% and polysiloxane topcoat 4 arranged on the surface of the body to be protected in sequence, wherein all powder materials in the inorganic zinc-rich primer 1, the epoxy sealing paint 2, the epoxy cloud iron intermediate paint 3 and the polysiloxane topcoat 4 are subjected to silane modification treatment, and the inorganic zinc-rich primer 1, the epoxy sealing paint 2 and the epoxy cloud iron intermediate paint 3 all contain rare earth chelating agents.

[0022] The graphene modified heavy-duty anticorrosive material described in the embodiment is composed of graphene modified inorganic zinc-rich primer 1, high solid content epoxy sealing paint 2, high solid content epoxy cloud iron intermediate paint 3 and polysiloxane topcoat 4, wherein modified graphene is added in the inorganic zinc-rich primer 1 to reduce the content of zinc powder, which not only reduces the cost, but also significantly improves the strength, hardness and wear resistance of the heavy-duty anticorrosive coating and prolongs the service life of the coating. In addition, combined with the rare earth chelating agent, the entire graphene modified heavy-duty anticorrosive material can complex the ferrous ions generated by rust in time, form a hard, dense and not easy to fall off protective layer on the surface of the steel structure, effectively prevent the steel structure from being eroded and damaged by factors such as atmosphere, water and soil, and improve the service life of the steel structure. In addition, all powder materials in the inorganic zinc-rich primer 1, the epoxy sealing paint 2, the epoxy cloud iron intermediate paint 3 and the polysiloxane topcoat 4 are subjected to silane modification treatment, which reduces the oil absorption and greatly reduces the emission of harmful gases, meets the modern environmental protection requirements and has a wide application prospect.

[0023] It should be noted that the rare earth chelating agent in the embodiment is a rare earth ytterbium chelate or a rare earth yttrium chelate, which can complex the ferrous ions generated by rust in time, block the further occurrence of rust and promote the reaction rate of the epoxy resin and the polyamide curing agent to accelerate the curing of the coating.

[0024] It should be further noted that the epoxy sealing paint 2 in the embodiment plays a role of sealing and protection in the anticorrosive system, which can form a hard protective layer to prevent corrosion factors from further eroding and invading, can effectively cover the defects and cracks of the inorganic zinc-rich primer 1, can improve the sealing property of the coating and can prevent the penetration of water and oxygen and other substances, thereby prolonging the service life of the coating.

[0025] In some specific embodiments, the method of silane modification treatment comprises: after the powder material is added into deionized water and ultrasonic cleaned for 25-35 minutes, it is added into a 5% silane coupling agent ethanol solution, sealed, and placed on a constant temperature 80℃ magnetic stirrer for continuous stirring for 2.5-3.5 hours, and then filtered, washed, and dried to constant weight to obtain the modified powder material. The method is simple, and the powder material after silane modification treatment has low oil absorption, greatly reducing the emission of harmful gases and meeting modern environmental protection requirements.

[0026] In some preferred embodiments, the silane coupling agent comprises one of methyltrimethoxysilane, phenyltrimethoxysilane, methyltriethoxysilane, ethyltrimethoxysilane, and ethyltriethoxysilane. The powder material is modified by the silane coupling agent, which is simple to operate, easy to obtain, and has good modification effect. The methyltrimethoxysilane coupling agent can make the coating have good adhesion and improve weather resistance; the phenyltrimethoxysilane coupling agent can make the coating improve chemical resistance and enhance water resistance; the methyltriethoxysilane coupling agent can make the coating improve smoothness and enhance high temperature resistance; the ethyltrimethoxysilane coupling agent can make the coating increase flexibility; and the ethyltriethoxysilane coupling agent can make the coating obtain excellent wear resistance. Using appropriate silane coupling agent can improve the adhesion, chemical resistance, weather resistance, water resistance, lubricity, high temperature resistance, flexibility, and wear resistance of the coating, thereby effectively improving the corrosion resistance and service life of the bridge.

[0027] In some specific embodiments, the weight composition of the inorganic zinc-rich primer 1 comprises: tetraethyl orthosilicate 20%, water 3%, propylene glycol methyl ether (PM) 7%, phosphorus iron powder 5-7%, titanium oxide 2%, silicon carbide 1%, iron blue powder 3%, boron nitride 2%, polyvinyl butyral 2%, REC-1 type rare earth ytterbium chelate 0.1-0.5%, REC-2 type rare earth yttrium chelate 0.1-0.5%, modified graphene 0.5-3%, zinc powder 62.5-67.8%, zinc chloride 0.5%, stannous chloride 0.5%, and silver nitrate 1%.

[0028] In this embodiment, tetraethyl orthosilicate is an organic silicon compound, which can provide adhesion and durability of the coating as a base material; phosphorus iron powder has a corrosion prevention effect in the coating, which can improve the durability and corrosion resistance of the coating; zinc powder acts as a barrier layer in the coating, which can provide excellent rust prevention and corrosion resistance; titanium oxide acts as a white pigment in the coating, which provides hiding power, gloss, and weather resistance of the coating; silicon carbide is a filler that can enhance the hardness, wear resistance, and high temperature resistance of the coating; zinc chloride, stannous chloride, and silver nitrate are used as catalysts or reaction aids, which can adjust the curing speed and specific chemical reactions of the coating; polyvinyl butyral is an adhesive commonly used in coatings as a dispersant and thickening agent, which helps to uniformly disperse other ingredients.

[0029] In some preferred embodiments, the method for preparing the modified graphene comprises: ultrasonic cleaning graphene in ethanol for 25-35 minutes, dispersing in DMF solvent, ultrasonic stirring for 10-20 minutes to obtain a dispersion, adding 5% by mass of siloxane coupling agent to the dispersion, stirring and heating to 90-100°C, and then reacting for 3 hours, and then obtaining the siloxane-modified graphene after centrifugation and washing.

[0030] In some preferred embodiments, the graphene is graphene nanoplatelets, wherein the graphene nanoplatelets are a two-dimensional material capable of improving the electrical conductivity, mechanical strength and corrosion resistance of the coating.

[0031] In some specific embodiments, the weight composition of the epoxy closed paint 2 comprises: 50% of epoxy resin, 5-20% of aluminum oxide, 1-5% of sheet-shaped titanium oxide, 5-10% of iron oxide, 1.5% of DMP-30 accelerator, 2-8% of active diluent, 25-27% of polyamide curing agent, 0.1-0.5% of REC-1 type rare earth ytterbium chelate, and 0.1-0.5% of REC-2 type rare earth yttrium chelate.

[0032] In this embodiment, the epoxy resin serves as a base material, providing excellent adhesion and protection performance in the coating, the active diluent is glycidyl ether, preferably ethylene glycol diglycidyl ether, which is used to adjust the viscosity of the coating to facilitate the construction and coating process, and the polyamide curing agent reacts with the epoxy resin to promote the curing and hardening of the coating.

[0033] In some specific embodiments, the weight composition of the epoxy cloud iron intermediate paint 3 comprises: 30-40% of epoxy resin, 10-20% of cloud iron powder, 7% of talc powder, 7-10% of aluminum oxide, 3-5% of precipitated barium sulfate, 5-7% of iron oxide, 1.5% of DMP-30 accelerator, 2-5% of active diluent, 20-22% of polyamide curing agent, 0.1-0.5% of REC-1 type rare earth ytterbium chelate, and 0.1-0.5% of REC-2 type rare earth yttrium chelate.

[0034] In this embodiment, the aluminum oxide serves as a filler in the coating, having wear resistance, high temperature resistance and chemical corrosion resistance, the iron oxide in the coating has color and hiding power, providing color and aesthetic appearance of the coating, the talc powder in the coating serves as a filler, improving the smoothness, wear resistance and corrosion resistance of the coating, the precipitated barium sulfate in the coating serves as a barrier layer, providing excellent flame retardant performance and corrosion resistance, and the cloud iron powder is an iron-containing pigment commonly used in coatings to provide color and weather resistance.

[0035] In some specific embodiments, the weight composition of the polysiloxane topcoat 4 comprises: polysiloxane resin 40%, silicone-modified acrylic resin 30%, isocyanate crosslinking agent 15%, glass microbeads 2%, titanium oxide 13%, flaky titanium oxide 2%, mica powder 2%, boron nitride powder 2%, modified graphene 0.1-1%, propylene glycol methyl ether 4%, isopropyl alcohol 4%, and ethanol 3%.

[0036] In this embodiment, the polysiloxane resin is an organic silicon compound that can increase the weather resistance, stain resistance and chemical resistance of the coating; the silicone-modified acrylic resin is a toughening agent that can improve the flexibility and impact resistance of the coating; the mica powder is used as a filler in the coating to provide heat resistance, electrical insulation and fireproof performance of the coating; the boron nitride powder has high hardness and wear resistance in the coating to provide wear resistance and corrosion resistance of the coating; the glass microbeads are commonly used as fillers to increase the gloss, uniformity and reflectivity of the coating; the isocyanate crosslinking agent is a chemical substance used for curing the coating to achieve hardening and durability of the coating; propylene glycol methyl ether and isopropyl alcohol are used as solvents to adjust the viscosity and flowability of the coating.

[0037] In some specific embodiments, the inorganic zinc-rich primer 1 is 1 layer with a thickness of 74-76 μm, the epoxy sealing paint 2 is 1 layer with a thickness of 64-66 μm, the epoxy micaceous iron intermediate paint 3 is 1 layer with a thickness of 119-121 μm, and the polysiloxane topcoat 4 is 1 layer with a thickness of 119-121 μm.

[0038] It should be noted that the powder materials in the graphene-modified heavy-duty anticorrosion material described in this embodiment include alumina, titanium oxide, iron oxide, precipitated barium sulfate, mica powder, micaceous iron powder, silicon carbide, talc powder, boron nitride powder and phosphorus iron powder, which are easy to form paint. In addition, in this embodiment, the graphene nanosheet, micaceous iron powder, titanium oxide and boron nitride powder are all in the form of flakes, thereby increasing reflection, reducing energy addition of the topcoat, and increasing weather resistance.

[0039] In addition, the graphene modified heavy-duty anticorrosive material described in this embodiment, the phosphorus iron powder and the cloud iron powder in the inorganic zinc-rich primer 1 can provide corrosion protection performance and form a dense anticorrosive layer. These anticorrosive components combined with the aluminum oxide in the epoxy sealing paint 2 can increase the wear resistance and corrosion resistance of the coating. The titanium oxide in the epoxy sealing paint 2 can form a hard protective layer to prevent further corrosion and intrusion of corrosion factors. This hard protective layer combined with the phosphorus iron powder and the cloud iron powder in the inorganic zinc-rich primer 1 can further enhance the corrosion resistance of the coating. The aluminum oxide and the iron oxide in the epoxy sealing paint 2 can increase the wear resistance and corrosion resistance of the coating. These fillers combined with the cloud iron powder and the precipitated barium sulfate in the epoxy cloud iron intermediate paint 3 can improve the compactness and barrier property of the coating, thereby further enhancing the anticorrosive effect of the coating. The flaky titanium oxide in the epoxy sealing paint 2 and the cloud iron powder in the intermediate paint can jointly improve the weather resistance and ultraviolet aging resistance of the coating. This joint action can make the coating more durable and prolong the service life of the coating. The cloud iron powder and the talc powder in the epoxy cloud iron intermediate paint 3 can increase the wear resistance and corrosion resistance of the coating. These fillers combined with the polysiloxane resin and the silicone-modified acrylic resin in the polysiloxane topcoat 4 can improve the smoothness and durability of the coating, while protecting the coating and improving the aesthetic appearance of the coating. The precipitated barium sulfate in the epoxy cloud iron intermediate paint 3 combined with the polysiloxane resin in the polysiloxane topcoat 4 can increase the compactness and barrier property of the coating, further improving the permeability resistance and waterproof performance of the coating. Through the above interactions, the formulations and substances between the inorganic zinc-rich primer 1, the epoxy sealing paint 2, the epoxy cloud iron intermediate paint 3 and the polysiloxane topcoat 4 can jointly promote the anticorrosive effect and service life of the coating. The inorganic zinc-rich primer 1 provides anticorrosive components, the epoxy sealing paint 2 forms a hard protective layer, the epoxy cloud iron intermediate paint 3 provides fillers and reinforcement, and the polysiloxane topcoat 4 protects the coating and improves the aesthetic appearance. The superposition effect of this four-layer coating system makes the anticorrosive system have better corrosion protection performance and durability.

[0040] Therefore, the graphene modified heavy-duty anticorrosive material comprises the graphene modified inorganic zinc-rich primer 1, the high solid content epoxy sealing paint 2, the high solid content epoxy iron oxide middle paint 3 and the polysiloxane topcoat 4, wherein the modified graphene is added in the inorganic zinc-rich primer 1 to reduce the content of zinc powder, which not only reduces the cost, but also significantly improves the strength, hardness and wear resistance of the heavy-duty anticorrosive coating, and improves the service life of the coating. In addition, combined with the rare earth chelating agent, the entire graphene modified heavy-duty anticorrosive material can complex the ferrous ions generated by rust in time, form a hard, dense and not easy to fall off protective layer on the surface of the steel structure, effectively prevent the steel structure from being eroded and damaged by factors such as atmosphere, water and soil, and improve the service life of the steel structure. In addition, all the powder materials in the inorganic zinc-rich primer 1, the epoxy sealing paint 2, the epoxy iron oxide middle paint 3 and the polysiloxane topcoat 4 are subjected to silane modification treatment, which reduces the oil absorption and greatly reduces the emission of harmful gases, meets the modern environmental protection requirements and has a wide application prospect.

[0041] Another embodiment of the present application also provides an application of the graphene modified heavy-duty anticorrosive material, specifically, the graphene modified heavy-duty anticorrosive material is coated on the surface of a steel structure building, a pipeline or a storage tank for anticorrosive protection.

[0042] The application of the graphene modified heavy-duty anticorrosive material described in the present embodiment is the same as the advantages of the graphene modified heavy-duty anticorrosive material relative to the prior art, and will not be described here.

[0043] Embodiment 1

[0044] The present embodiment provides a graphene modified heavy-duty anticorrosive material, which comprises a graphene modified inorganic zinc-rich primer, an epoxy sealing paint, an epoxy iron oxide middle paint and a polysiloxane topcoat arranged on the surface of a body to be anticorrosive in sequence, wherein the inorganic zinc-rich primer is 1 layer, the thickness is 75 μm, the epoxy sealing paint is 1 layer, the thickness is 65 μm, the epoxy iron oxide middle paint is 1 layer, the thickness is 120 μm, and the polysiloxane topcoat is 1 layer, the thickness is 120 μm.

[0045] Specifically, in the present embodiment,

[0046] The inorganic zinc-rich primer comprises, in terms of weight fraction, 1 part of modified graphene, 40 parts of tetraethyl orthosilicate, 6 parts of water, 4 parts of PM1, 4 parts of aluminum oxide, 14 parts of phosphorus iron powder, 4 parts of titanium oxide, 2 parts of silicon carbide, 6 parts of iron oxide powder, 1 part of REC-1 type rare earth ytterbium chelate, 1 part of REC-2 type rare earth yttrium chelate, 4 parts of boron nitride, 4 parts of polyvinyl butyral, 136 parts of zinc powder, 1 part of zinc chloride, 1 part of stannous chloride and 2 parts of silver nitrate.

[0047] The epoxy sealing paint comprises, by weight fraction: epoxy resin 100 parts, alumina 25 parts, flaky titanium oxide 6 parts, iron oxide 15 parts, DMP-30 accelerator 3 parts, active diluent (glycol diglycidyl ether) 10 parts, polyamide curing agent 32 parts, REC-1 type rare earth ytterbium chelate 1 part, and REC-2 type rare earth yttrium chelate 1 part.

[0048] The epoxy cloud iron intermediate paint comprises, by weight fraction: epoxy resin 70 parts, cloud iron powder (flaky iron oxide) 30 parts, talc powder 14 parts, alumina 17 parts, precipitated barium sulfate 8 parts, iron oxide 12 parts, DMP-30 accelerator 3 parts, active diluent (glycol diglycidyl ether) 7 parts, polyamide curing agent 42 parts, REC-1 type rare earth ytterbium chelate 1 part, and REC-2 type rare earth yttrium chelate 1 part.

[0049] The polysiloxane topcoat comprises, by weight fraction: polysiloxane resin 80 parts, silicone-modified acrylic resin 60 parts, isocyanate crosslinking agent 30 parts, glass microbeads 4 parts, titanium oxide 26 parts, flaky titanium oxide 4 parts, mica powder 4 parts, boron nitride powder (flaky) 4 parts, modified graphene 1 part, PM 8 parts, isopropyl alcohol 8 parts, and ethanol 6 parts.

[0050] The preparation method of the inorganic zinc-rich primer is as follows: first, tetraethyl orthosilicate, boron nitride, zinc powder, phosphorus iron powder, alumina, titanium oxide, cloud iron powder, and silicon carbide are fully mixed at a rotation speed of 1000 r / min for 4 hours, then a proper amount of modified graphene, REC-1 type rare earth ytterbium chelate, zinc chloride, stannous chloride, silver nitrate are further mixed for 1 hour, and finally water, PM, and polyvinyl butyral are fully stirred at a rotation speed of 1200 r / min for 1-2 hours until a uniform slurry is formed.

[0051] The preparation method of the modified graphene comprises the following steps: graphene nanosheets are ultrasonically cleaned in ethanol for 30 minutes, then dispersed in a DMF solvent, ultrasonic stirring is performed for 15 minutes to make the dispersion uniform, a siloxane coupling agent with a mass fraction of 5% is added to the dispersion, stirring is maintained and heating is performed to 95°C, and then reaction is performed for 3 hours, after the reaction is completed, high-speed centrifugation is performed at 6000 rpm and washing is performed with a DMF solvent to obtain siloxane-modified graphene. Through the steps of adding solvents such as ethanol and DMF and ultrasonic stirring, the nanosheets can be better dispersed in the solution to effectively avoid agglomeration and deposition of the nanosheets. Further adding a siloxane coupling agent to the dispersion and performing thermal reaction can realize surface modification of the graphene nanosheet powder. In the preparation process, a large amount of VOCs is not generated because the solvents and coupling agents used in the technology are low-volatility, which can reduce the VOC content in the coating material. A safer and healthier working environment can be provided, and the emission of harmful chemical substances in the atmosphere is reduced, which is of great significance to protecting human health and reducing air pollution.

[0052] The preparation method of the epoxy closed paint comprises the following steps: epoxy resin, aluminum oxide, titanium oxide and iron oxide are fully mixed at a rotation speed of 800 r / min for 3 hours, then DMP-30 accelerator, active diluent, REC-1 type rare earth ytterbium chelate and REC-2 type rare earth yttrium chelate are further mixed and stirred for 1 hour, and finally polyamide curing agent is fully stirred at a rotation speed of 1200 r / min for 2 hours to form a uniform slurry.

[0053] The preparation method of the epoxy iron oxide intermediate paint comprises the following steps: epoxy resin, talc powder, aluminum oxide, iron oxide and barium sulfate are fully mixed at a rotation speed of 1000 r / min for 3 hours, then DMP-30 accelerator, active diluent, REC-1 type rare earth ytterbium chelate and REC-2 type rare earth yttrium chelate are further mixed and stirred for 1 hour, and finally polyamide curing agent is fully stirred at a rotation speed of 1500 r / min for 2 hours to form a uniform slurry.

[0054] The preparation method of the polysiloxane topcoat paint comprises the following steps: polysiloxane resin, silicone-modified acrylic resin, titanium oxide, glass beads and mica powder are fully mixed at a rotation speed of 500 r / min for 3 hours, then modified graphene, flaky titanium oxide and flaky boron nitride powder are further mixed and stirred at a rotation speed of 800 r / min for 1 hour, and finally isocyanate crosslinking agent, PM, water and ethanol are fully stirred at a rotation speed of 1200 r / min for 2-3 hours until a uniform slurry is formed.

[0055] In addition, it should be noted that all the powder materials in the present embodiment are subjected to silane modification treatment, wherein the silane modification method comprises: adding the powder material into deionized water for ultrasonic cleaning for 30 minutes, then adding a 5% mass fraction of silane coupling agent ethanol solution, sealing and placing on a constant temperature 80℃ magnetic stirrer for continuous stirring for 3 hours, after the reaction is completed, the obtained product is washed three times by suction filtration and dried in an oven for 12h to constant weight to obtain the modified powder filler. The powder material includes alumina, titanium oxide, iron oxide, precipitated barium sulfate, mica powder, cloud iron powder, silicon carbide, talc powder, boron nitride powder and phosphorus iron powder.

[0056] It should also be noted that the graphene nanosheet in the present embodiment is from Shanghai Aladdin Biochemical Technology Co., Ltd.

[0057] The silane coupling agent is one of methyltrimethoxysilane (Yunsheng Chemical Co., Ltd.), phenyltrimethoxysilane (Zhejiang Woxingman Material Technology Co., Ltd.), methyltriethoxysilane (Shandong Duoli Chemical Co., Ltd.), ethyltrimethoxysilane (Qufu Yishun Chemical Co., Ltd.), and ethyltriethoxysilane (Qufu Yishun Chemical Co., Ltd.).

[0058] The polysiloxane resin is SH-023-7 with a viscosity of 1000-1200mpa.s, Hubei Longshisihai New Material Co., Ltd.

[0059] The silicone-modified acrylic resin is SH-024 with a viscosity of 20-120S and a solid content of 50%, Hubei Longshisihai New Material Co., Ltd.

[0060] The isocyanate crosslinking agent is TMAIC-6291, Guangzhou Shanghe Chemical Technology Co., Ltd.

[0061] The polyamide curing agent has an amine value of 200±20(mgKOH / g) and a viscosity of 2000-4000mpa.s, Jinan Yuangbola Chemical Technology Co., Ltd.

[0062] REC-1 type rare earth ytterbium chelate and REC-2 type rare earth yttrium chelate are purchased from Shaanxi Xitai Xingbang Material Technology Co., Ltd.

[0063] Graphene is purchased from Suzhou Beikona Nanotechnology Co., Ltd.

[0064] DPM-30 accelerator is purchased from Jinan Qingtian Chemical Technology Co., Ltd.

[0065] Ethylene glycol diglycidyl ether is purchased from Shandong Jinghao Chemical Co., Ltd.

[0066] Example 2

[0067] The difference between the embodiment and embodiment 1 is that the graphene modified heavy-duty anticorrosive material provided by the embodiment comprises a graphene modified inorganic zinc-rich primer, an epoxy sealing paint, an epoxy iron oxide middle paint and a polysiloxane topcoat which are sequentially arranged on the surface of a body to be anticorrosive, wherein:

[0068] The inorganic zinc-rich primer comprises, in terms of weight fraction, 2 parts of modified graphene, 40 parts of tetraethyl orthosilicate, 6 parts of water, 14 parts of PM, 4 parts of aluminum oxide, 13 parts of phosphorus iron powder, 4 parts of titanium oxide, 2 parts of silicon carbide, 6 parts of iron oxide powder, 1 part of REC-1 type rare earth ytterbium chelate, 1 part of REC-2 type rare earth yttrium chelate, 4 parts of boron nitride, 4 parts of polyvinyl butyral, 134 parts of zinc powder, 1 part of zinc chloride, 1 part of stannous chloride and 2 parts of silver nitrate.

[0069] The epoxy sealing paint comprises, in terms of weight fraction, 100 parts of epoxy resin, 25 parts of aluminum oxide, 6 parts of flaky titanium oxide, 15 parts of iron oxide, 3 parts of DMP-30 accelerator, 10 parts of active diluent (glycol diglycidyl ether), 32 parts of polyamide curing agent, 1 part of REC-1 type rare earth ytterbium chelate and 1 part of REC-2 type rare earth yttrium chelate.

[0070] The epoxy iron oxide middle paint comprises, in terms of weight fraction, 70 parts of epoxy resin, 30 parts of iron oxide powder (flaky iron oxide), 14 parts of talc powder, 17 parts of aluminum oxide, 8 parts of precipitated barium sulfate, 12 parts of iron oxide, 3 parts of DMP-30 accelerator, 7 parts of active diluent (glycol diglycidyl ether), 42 parts of polyamide curing agent, 1 part of REC-1 type rare earth ytterbium chelate and 1 part of REC-2 type rare earth yttrium chelate.

[0071] The polysiloxane topcoat comprises, in terms of weight fraction, 80 parts of polysiloxane resin, 60 parts of silicone modified acrylic resin, 30 parts of isocyanate crosslinking agent, 4 parts of glass microbeads, 26 parts of titanium oxide, 4 parts of flaky titanium oxide, 4 parts of mica powder, 4 parts of boron nitride powder (flaky), 1 part of modified graphene, 8 parts of PM, 8 parts of isopropyl alcohol and 6 parts of ethanol.

[0072] Embodiment 3

[0073] The difference between the embodiment and embodiment 1 is that the graphene modified heavy-duty anticorrosive material provided by the embodiment comprises a graphene modified inorganic zinc-rich primer, an epoxy sealing paint, an epoxy iron oxide middle paint and a polysiloxane topcoat which are sequentially arranged on the surface of a body to be anticorrosive, wherein:

[0074] The inorganic zinc-rich primer comprises, by weight fraction: modified graphene 3 parts, tetraethyl orthosilicate 40 parts, water 6 parts, PM 14 parts, aluminum oxide 4 parts, phosphorus iron powder 12 parts, titanium oxide 4 parts, silicon carbide 2 parts, cloud iron powder 6 parts, REC-1 type rare earth ytterbium chelate 1 part, REC-2 type rare earth yttrium chelate 1 part, boron nitride 4 parts, polyvinyl butyral 4 parts, zinc powder 132 powder, zinc chloride 1 part, stannous chloride 1 part, silver nitrate 2 parts.

[0075] The epoxy sealing paint comprises, by weight fraction: epoxy resin 100 parts, aluminum oxide 25 parts, flaky titanium oxide 6 parts, iron oxide 15 parts, DMP-30 accelerator 3 parts, active diluent (glycol diglycidyl ether) 10 parts, polyamide curing agent 32 parts, REC-1 type rare earth ytterbium chelate 1 part, REC-2 type rare earth yttrium chelate 1 part.

[0076] The epoxy cloud iron intermediate paint comprises, by weight fraction: epoxy resin 70 parts, cloud iron powder (flaky iron oxide) 30 parts, talc powder 14 parts, aluminum oxide 17 parts, precipitated barium sulfate 8 parts, iron oxide 12 parts, DMP-30 accelerator 3 parts, active diluent (glycol diglycidyl ether) 7 parts, polyamide curing agent 42 parts, REC-1 type rare earth ytterbium chelate 1 part, REC-2 type rare earth yttrium chelate 1 part.

[0077] The polysiloxane topcoat comprises, by weight fraction: polysiloxane resin 80 parts, silicone-modified acrylic resin 60 parts, isocyanate crosslinking agent 30 parts, glass microbeads 4 parts, titanium oxide 26 parts, flaky titanium oxide 4 parts, mica powder 4 parts, boron nitride powder (flaky) 4 parts, modified graphene 1 part, PM 8 parts, isopropyl alcohol 8 parts, ethanol 6 parts.

[0078] Example 4

[0079] The difference between the present embodiment and Example 1 is that the present embodiment provides a graphene-modified heavy-duty anticorrosion material, which comprises, in sequence, a graphene-modified inorganic zinc-rich primer, an epoxy sealing paint, an epoxy cloud iron intermediate paint, and a polysiloxane topcoat arranged on the surface of a body to be protected.

[0080] The inorganic zinc-rich primer comprises, by weight fraction: modified graphene 4 parts, tetraethyl orthosilicate 40 parts, water 6 parts, PM 14 parts, aluminum oxide 4 parts, phosphorus iron powder 11 parts, titanium oxide 4 parts, silicon carbide 2 parts, cloud iron powder 6 parts, REC-1 type rare earth ytterbium chelate 1 part, REC-2 type rare earth yttrium chelate 1 part, boron nitride 4 parts, polyvinyl butyral 4 parts, zinc powder 130 powder, zinc chloride 1 part, stannous chloride 1 part, silver nitrate 2 parts.

[0081] The epoxy sealing paint comprises, by weight fraction: epoxy resin 100 parts, aluminum oxide 25 parts, sheet titanium oxide 6 parts, iron oxide 15 parts, DMP-30 accelerator 3 parts, active diluent (glycol diglycidyl ether) 10 parts, polyamide curing agent 32 parts, REC-1 type rare earth ytterbium chelate 1 part, and REC-2 type rare earth yttrium chelate 1 part.

[0082] The epoxy sealing paint comprises, by weight fraction: epoxy resin 100 parts, aluminum oxide 25 parts, sheet titanium oxide 6 parts, iron oxide 15 parts, DMP-30 accelerator 3 parts, active diluent (glycol diglycidyl ether) 10 parts, polyamide curing agent 32 parts, REC-1 type rare earth ytterbium chelate 1 part, and REC-2 type rare earth yttrium chelate 1 part.

[0083] The polysiloxane topcoat comprises, by weight fraction: polysiloxane resin 80 parts, silicone-modified acrylic resin 60 parts, isocyanate crosslinking agent 30 parts, glass microbeads 4 parts, titanium oxide 26 parts, sheet titanium oxide 4 parts, mica powder 4 parts, boron nitride powder (sheet) 4 parts, modified graphene 2 parts, PM 8 parts, isopropyl alcohol 8 parts, and ethanol 6 parts.

[0084] Embodiment 5

[0085] The embodiment is different from embodiment 1 in that the graphene-modified heavy-duty anticorrosive material provided by the embodiment comprises, in sequence, a graphene-modified inorganic zinc-rich primer, an epoxy sealing paint, an epoxy iron oxide intermediate paint, and a polysiloxane topcoat arranged on the surface of a body to be protected, wherein:

[0086] The inorganic zinc-rich primer comprises, by weight fraction: modified graphene 5 parts, tetraethyl orthosilicate 40 parts, water 6 parts, PM 14 parts, aluminum oxide 4 parts, phosphorus iron powder 10 parts, titanium oxide 4 parts, silicon carbide 2 parts, iron oxide powder 6 parts, REC-1 type rare earth ytterbium chelate 1 part, REC-2 type rare earth yttrium chelate 1 part, boron nitride 4 parts, polyvinyl butyral 4 parts, zinc powder 128 powder, zinc chloride 1 part, stannous chloride 1 part, and silver nitrate 2 parts.

[0087] The epoxy sealing paint comprises, by weight fraction: epoxy resin 100 parts, aluminum oxide 25 parts, sheet titanium oxide 6 parts, iron oxide 15 parts, DMP-30 accelerator 3 parts, active diluent (glycol diglycidyl ether) 10 parts, polyamide curing agent 32 parts, REC-1 type rare earth ytterbium chelate 1 part, and REC-2 type rare earth yttrium chelate 1 part.

[0088] The epoxy iron oxide intermediate paint includes, by weight fraction, epoxy resin 70 parts, iron oxide powder (flaky iron oxide) 30 parts, talc powder 14 parts, aluminum oxide 17 parts, precipitated barium sulfate 8 parts, iron oxide 12 parts, DMP-30 accelerator 3 parts, active diluent (glycol diglycidyl ether) 7 parts, polyamide curing agent 42 parts, REC-1 type rare earth ytterbium chelate 1 part, and REC-2 type rare earth yttrium chelate 1 part.

[0089] The polysiloxane topcoat includes, by weight fraction, polysiloxane resin 80 parts, silicone-modified acrylic resin 60 parts, isocyanate crosslinking agent 30 parts, glass microbeads 4 parts, titanium oxide 26 parts, flaky titanium oxide 4 parts, mica powder 4 parts, boron nitride powder (flaky) 4 parts, modified graphene 2 parts, PM 8 parts, isopropyl alcohol 8 parts, and ethanol 6 parts.

[0090] Embodiment 6

[0091] The embodiment differs from Embodiment 1 in that the graphene-modified heavy-duty anticorrosive material provided by the embodiment includes graphene-modified inorganic zinc-rich primer, epoxy sealing paint, epoxy iron oxide intermediate paint, and polysiloxane topcoat arranged on the surface of the body to be protected in sequence, wherein:

[0092] The inorganic zinc-rich primer includes, by weight fraction, modified graphene 6 parts, tetraethyl orthosilicate 40 parts, water 6 parts, PM 14 parts, aluminum oxide 4 parts, phosphorus iron powder 10 parts, titanium oxide 4 parts, silicon carbide 2 parts, iron oxide powder 6 parts, REC-1 type rare earth ytterbium chelate 1 part, REC-2 type rare earth yttrium chelate 1 part, boron nitride 4 parts, polyvinyl butyral 4 parts, zinc powder 126 parts, zinc chloride 1 part, stannous chloride 1 part, and silver nitrate 2 parts.

[0093] The epoxy sealing paint includes, by weight fraction, epoxy resin 100 parts, aluminum oxide 25 parts, flaky titanium oxide 6 parts, iron oxide 15 parts, DMP-30 accelerator 3 parts, active diluent (glycol diglycidyl ether) 10 parts, polyamide curing agent 32 parts, REC-1 type rare earth ytterbium chelate 1 part, and REC-2 type rare earth yttrium chelate 1 part.

[0094] The epoxy iron oxide intermediate paint includes, by weight fraction, epoxy resin 70 parts, iron oxide powder (flaky iron oxide) 30 parts, talc powder 14 parts, aluminum oxide 17 parts, precipitated barium sulfate 8 parts, iron oxide 12 parts, DMP-30 accelerator 3 parts, active diluent (glycol diglycidyl ether) 7 parts, polyamide curing agent 42 parts, REC-1 type rare earth ytterbium chelate 1 part, and REC-2 type rare earth yttrium chelate 1 part.

[0095] The polysiloxane finish includes, by weight fraction: polysiloxane resin 80 parts, silicone-modified acrylic resin 60 parts, isocyanate crosslinking agent 30 parts, glass beads 4 parts, titanium oxide 26 parts, flaky titanium oxide 4 parts, mica powder 4 parts, boron nitride powder (flaky) 4 parts, modified graphene 2 parts, PM 8 parts, isopropyl alcohol 8 parts, ethanol 6 parts.

[0096] Comparative Example 1

[0097] The difference between the present example and Example 1 is that the heavy-duty anticorrosive material provided in the present example includes, in sequence, an inorganic zinc-rich primer, an epoxy sealing paint, an epoxy iron oxide intermediate paint, and a polysiloxane finish disposed on the surface of a body to be protected, wherein all the powder materials are not subjected to silane modification treatment, the graphene in the inorganic zinc-rich primer is not subjected to modification treatment, and the inorganic zinc-rich primer, the epoxy sealing paint, and the epoxy iron oxide intermediate paint do not contain a rare earth chelating agent, and specifically include:

[0098] The inorganic zinc-rich primer includes, by weight fraction: graphene 1 part, tetraethyl orthosilicate 40 parts, water 6 parts, PM 14 parts, aluminum oxide 4 parts, phosphorus iron powder 14 parts, titanium oxide 4 parts, silicon carbide 2 parts, iron oxide powder 6 parts, boron nitride 4 parts, polyvinyl butyral 4 parts, zinc powder 136 parts, zinc chloride 1 part, stannous chloride 1 part, silver nitrate 2 parts.

[0099] The epoxy sealing paint includes, by weight fraction: epoxy resin 100 parts, aluminum oxide 25 parts, flaky titanium oxide 6 parts, iron oxide 15 parts, DMP-30 accelerator 3 parts, active diluent (glycol diglycidyl ether) 10 parts, polyamide curing agent 32 parts.

[0100] The epoxy iron oxide intermediate paint includes, by weight fraction: epoxy resin 70 parts, iron oxide powder (flaky iron oxide) 30 parts, talc powder 14 parts, aluminum oxide 17 parts, precipitated barium sulfate 8 parts, iron oxide 12 parts, DMP-30 accelerator 3 parts, active diluent solvent (glycol diglycidyl ether) 7 parts, polyamide curing agent 42 parts.

[0101] The polysiloxane finish includes, by weight fraction: polysiloxane resin 80 parts, silicone-modified acrylic resin 60 parts, isocyanate crosslinking agent 30 parts, glass beads 4 parts, titanium oxide 26 parts, flaky titanium oxide 4 parts, mica powder 4 parts, boron nitride powder (flaky) 4 parts, graphene 1 part, PM 8 parts, isopropyl alcohol 8 parts, ethanol 6 parts.

[0102] Comparative Example 2

[0103] The difference between the embodiment 1 is that the heavy corrosion resistant material provided by the embodiment comprises inorganic zinc-rich primer, epoxy sealing paint, epoxy iron oxide intermediate paint and polysiloxane topcoat which are arranged on the surface of the body to be protected in sequence, wherein all the powder materials are not subjected to silane modification treatment, the inorganic zinc-rich primer does not contain graphene, and the inorganic zinc-rich primer, the epoxy sealing paint and the epoxy iron oxide intermediate paint do not contain rare earth chelating agent, and specifically comprises the following components in parts by weight:

[0104] The inorganic zinc-rich primer comprises tetraethyl orthosilicate 40 parts, water 6 parts, PM 14 parts, aluminum oxide 4 parts, phosphorus iron powder 14 parts, titanium oxide 4 parts, silicon carbide 2 parts, iron oxide powder 6 parts, boron nitride 4 parts, polyvinyl butyral 4 parts, zinc powder 136 parts, zinc chloride 1 part, stannous chloride 1 part and silver nitrate 2 parts.

[0105] The epoxy sealing paint comprises epoxy resin 100 parts, aluminum oxide 25 parts, flaky titanium oxide 6 parts, iron oxide 15 parts, DMP-30 accelerator 3 parts, active diluent (glycol diglycidyl ether) 10 parts and polyamide curing agent 32 parts.

[0106] The epoxy iron oxide intermediate paint comprises epoxy resin 70 parts, iron oxide powder (flaky iron oxide) 30 parts, talc powder 14 parts, aluminum oxide 17 parts, precipitated barium sulfate 8 parts, iron oxide 12 parts, DMP-30 accelerator 3 parts, active diluent (glycol diglycidyl ether) 7 parts and polyamide curing agent 42 parts.

[0107] The polysiloxane topcoat comprises polysiloxane resin 80 parts, silicone-modified acrylic resin 60 parts, isocyanate crosslinking agent 30 parts, glass microbeads 4 parts, titanium oxide 26 parts, flaky titanium oxide 4 parts, mica powder 4 parts, boron nitride powder (flaky) 4 parts, PM 8 parts, isopropyl alcohol 8 parts and ethanol 6 parts.

[0108] The heavy corrosion resistant materials in the embodiments 1-6 and the comparative examples 1-2 are subjected to salt spray resistance test (referring to GB / T10125), VOCs test (referring to GB / T 23985-2009), aging resistance test (referring to GB / T1865-2009), hardness test (referring to GB / T 6739-2006), adhesion test (referring to GB 1720-79) and wear resistance test (referring to GB / T 1768-2006), and the test results are shown in the following table.

[0109] Table 1 Performance test results of the heavy corrosion resistant materials in the embodiments 1-6 and the comparative examples 1-2

[0110]

[0111]

[0112] It can be seen from the comparative example 1 and the comparative example 2 that the addition of the graphene material helps to improve the salt mist resistance, aging resistance and wear resistance of the heavy-duty corrosion-resistant material, and is more environmentally friendly. In addition, it can be seen from the performance detection results of the heavy-duty corrosion-resistant materials in the example 1-6 and the comparative examples 1-2 that, compared with the heavy-duty corrosion-resistant materials obtained in the comparative example 1 and the comparative example 2, the heavy-duty corrosion-resistant materials obtained in the example 1-6 have low VOCs, excellent salt mist resistance, aging resistance and wear resistance. It can be seen that the silane modification treatment of the powder material, the graphene modification treatment and the addition of the rare earth chelating agent have obvious effects on improving the salt mist resistance, aging resistance, wear resistance and environmental protection performance of the heavy-duty corrosion-resistant material.

[0113] Although the present application discloses as above, the protection scope of the present application is not limited to this. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present application, and these changes and modifications shall fall within the protection scope of the present application.

Claims

1. A graphene-modified heavy-duty anticorrosive material, characterized by, The coating comprises, sequentially applied to the surface of the object to be protected, a graphene-modified inorganic zinc-rich primer (1), an epoxy sealing paint (2) with a solid content of 50%-70%, an epoxy micaceous iron oxide intermediate paint (3) with a solid content of 50%-70%, and a polysiloxane topcoat (4). All powder materials in the inorganic zinc-rich primer (1), the epoxy sealing paint (2), the epoxy micaceous iron oxide intermediate paint (3), and the polysiloxane topcoat (4) are silane-modified. The epoxy micaceous iron oxide intermediate paint (3) contains rare earth chelating agents, namely REC-1 rare earth ytterbium chelate and REC-2 rare earth yttrium chelate. The method of silane modification treatment includes: adding the powder material to deionized water for ultrasonic cleaning for 25-35 minutes, then adding it to an ethanol solution of 5% silane coupling agent by mass, sealing it, and placing it on a magnetic stirrer at a constant temperature of 80°C for continuous stirring for 2.5-3.5 hours. After filtration, washing, and drying to constant weight, the modified powder material is obtained.

2. The graphene-modified heavy-duty anticorrosive material according to claim 1, characterized in that, The silane coupling agent includes one of methyltrimethoxysilane, phenyltrimethoxysilane, methyltriethoxysilane, ethyltrimethoxysilane, and ethyltriethoxysilane.

3. The graphene-modified heavy-duty anticorrosive material according to claim 1, characterized in that, The inorganic zinc-rich primer (1) comprises the following components by weight: 1 part modified graphene, 40 parts tetraethyl orthosilicate, 6 parts water, 14 parts PM, 4 parts alumina, 14 parts iron phosphate powder, 4 parts titanium oxide, 2 parts silicon carbide, 6 parts micaceous iron powder, 1 part REC-1 type rare earth ytterbium chelate, 1 part REC-2 type rare earth yttrium chelate, 4 parts boron nitride, 4 parts polyvinyl butyral, 136 parts zinc powder, 1 part zinc chloride, 1 part stannous chloride, and 2 parts silver nitrate.

4. The graphene-modified heavy-duty anticorrosive material according to claim 3, characterized in that, The method for preparing the modified graphene includes: ultrasonically cleaning graphene in ethanol for 25-35 minutes, dispersing it in DMF solvent, ultrasonically stirring for 10-20 minutes to obtain a dispersion, adding 5% by mass of siloxane coupling agent to the dispersion, stirring and heating to 90-100℃ for 3 hours, and obtaining siloxane-modified graphene after centrifugation and washing.

5. The graphene-modified heavy-duty anti-corrosion material according to claim 1, characterized in that, The epoxy sealing varnish (2) comprises, by weight: 50% epoxy resin, 5-20% alumina, 1-5% flake titanium dioxide, 5-10% iron oxide, 1.5% DMP-30 accelerator, 2-8% reactive diluent, 25-27% polyamide curing agent, 0.1-0.5% REC-1 type rare earth yttrium chelate and 0.1-0.5% REC-2 type rare earth yttrium chelate.

6. The graphene-modified heavy-duty anti-corrosion material according to claim 1, characterized in that, The epoxy micaceous iron oxide intermediate paint (3) comprises the following components by weight: 30-40% epoxy resin, 10-20% micaceous iron oxide powder, 7% talc powder, 7-10% alumina, 3-5% precipitated barium sulfate, 5-7% iron oxide, 1.5% DMP-30 accelerator, 2-5% reactive diluent, 20-22% polyamide curing agent, 0.1-0.5% REC-1 type rare earth yttrium chelate and 0.1-0.5% REC-2 type rare earth yttrium chelate.

7. The graphene-modified heavy-duty anti-corrosion material according to claim 1, characterized in that, The polysiloxane topcoat (4) comprises the following components by weight: 80 parts polysiloxane resin, 60 parts silicone-modified acrylic resin, 30 parts isocyanate crosslinking agent, 4 parts glass microspheres, 26 parts titanium dioxide, 4 parts flake titanium dioxide, 4 parts mica powder, 4 parts flake boron nitride powder, 1 part modified graphene, 8 parts PM, 8 parts isopropanol, and 6 parts ethanol.

8. The graphene-modified heavy-duty anti-corrosion material according to claim 1, characterized in that, The inorganic zinc-rich primer (1) has a thickness of 74-76 μm, the epoxy sealing paint (2) has a thickness of 64-66 μm, the epoxy micaceous iron oxide intermediate paint (3) has a thickness of 119-121 μm, and the polysiloxane topcoat (4) has a thickness of 119-121 μm.

9. An application of the graphene-modified heavy-duty anti-corrosion material as described in any one of claims 1-8, characterized in that, Graphene-modified heavy-duty anti-corrosion materials are applied to the surfaces of steel structures, pipelines, or storage tanks for corrosion protection.

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