Marine and alkali resistant anticorrosive coating, preparation method and application thereof

Abstract

The application discloses a kind of seawater-resistant alkali-resistant anticorrosive paint and its preparation method and application, belong to corrosion protection coating technical field;The anticorrosive paint is composed of component A and component B, wherein component A includes composite epoxy resin 40-60 parts by weight, solvent 15-20 parts, composite basalt flake 5-15 parts, graphene oxide 0.5-2 parts, dispersing agent 1-5 parts, defoaming agent 1-2 parts, leveling agent 0.5-2 parts, coupling agent 0.5-2 parts, anti-sediment agent 0.5-2 parts, corrosion inhibitor 0.5-3 parts;Filler 15-25 parts;Component B includes composite curing agent 100 parts by weight;Compared with prior art only for single seawater corrosion condition or alkaline environment corrosion condition, the anticorrosive paint has excellent seawater corrosion resistance and alkali corrosion resistance, and can provide excellent corrosion protection for various components in seawater direct hydrogen production equipment that are in long-term contact with seawater and high-concentration alkali in marine environment or high-concentration alkali environment, and also has good stability in high-temperature working condition of heat exchanger.

Description

Technical Field

[0001] This invention belongs to the field of corrosion protection coating technology, specifically relating to a seawater-resistant and alkali-resistant anti-corrosion coating, its preparation method, and its application. Background Technology

[0002] With the continuous increase in societal energy consumption, traditional fossil fuels can no longer meet future development needs. The development of clean energy sources such as wind power, solar energy, and hydrogen energy will gradually become mainstream. Among these, hydrogen energy produces only water without emitting other pollutants during use, making it a clean energy source with enormous development potential and a viable alternative to fossil fuels. Currently, the main types of hydrogen production are gray hydrogen, blue hydrogen, and green hydrogen. Although gray hydrogen and blue hydrogen currently account for a large scale, they rely on fossil fuels and have high pollutant emissions. Meanwhile, water electrolysis technology for hydrogen production is maturing, enabling large-scale production of green hydrogen with minimal carbon emissions, making it an important pathway to convert clean energy sources such as wind power and solar energy into hydrogen energy.

[0003] In the newly developed direct hydrogen production technology without seawater desalination, seawater is used directly as the water source, combined with an alkaline electrolyzer for hydrogen production. This eliminates the seawater desalination step and can be integrated with renewable and clean energy sources such as offshore wind power. It is a novel hydrogen production technology with enormous application potential and economic value. However, direct hydrogen production equipment without seawater desalination still faces many corrosion protection challenges in practical applications. Because mass transfer components are in direct contact with seawater for extended periods, pipes, isolation nets, and other components will corrode and age. Furthermore, many components in the alkaline electrolyzer are in long-term contact with high-concentration alkaline solutions, which are volatile and prone to alkaline corrosion. Under these conditions, traditional anti-corrosion coatings are insufficient to meet the corrosion resistance requirements under long-term seawater scouring or immersion, and their protection against strong alkali corrosion is weak. Additionally, the high-temperature alkaline solution requires the introduction of seawater for cooling. Therefore, higher requirements are placed on the heat resistance, alkali resistance, and seawater corrosion resistance of the anti-corrosion coating.

[0004] Chinese Patent Publication No. CN100413935C, filed on December 27, 2002, discloses a seawater-resistant fusion-bonded epoxy modified powder coating. This coating is composed of E21 epoxy resin, dicyandiamide curing agent, ultrafine titanium dioxide modifier, calcium carbonate, and barium sulfate fillers. It features strong adhesion to the substrate, high mechanical strength, and strong impermeability, and can withstand erosion from saturated salt solutions of NaCl and KCl. Chinese Patent Publication No. CN111518456A, filed on June 4, 2020, discloses a penetrating waterproof and alkali-resistant coating and its preparation method. This coating is composed of modified nano-silica, modified epoxy resin, defoamer, dispersant, filler, and pigments. It overcomes the shortcomings of traditional waterproof coatings, such as poor alkali resistance, easy blistering, and peeling, and has excellent penetrability, alkali resistance, and adhesion.

[0005] However, for the marine environment and operating conditions of direct hydrogen production equipment without seawater desalination, the existing technologies that only adjust the anti-corrosion coatings to improve salt and alkali resistance are difficult to meet the actual needs. Corrosive media in seawater can easily penetrate into the coating and cause corrosion reactions at the substrate interface. In addition, the temperature of the alkaline solution in the electrolyzer is high, and the coating is more susceptible to damage from the alkaline solution and seawater under high temperature conditions, resulting in corrosion failure.

[0006] Therefore, in summary, developing a coating that combines excellent resistance to seawater corrosion and alkaline corrosion with good stability under high-temperature conditions is of great practical significance and has enormous application potential. Summary of the Invention

[0007] To address the shortcomings of existing technologies, this invention provides a seawater- and alkali-resistant anti-corrosion coating, its preparation method, and its application. The anti-corrosion coating possesses excellent resistance to both seawater corrosion and alkali corrosion, providing superior anti-corrosion effects for various components in seawater direct hydrogen production equipment that are in long-term contact with seawater and high-concentration alkali solutions. Furthermore, it exhibits good stability under high-temperature operating conditions in heat exchangers.

[0008] The technical solution of the present invention is as follows:

[0009] One objective of this invention is to provide a seawater- and alkali-resistant anti-corrosion coating. The anti-corrosion coating comprises component A and component B. By weight, component A includes: 40-60 parts of composite epoxy resin; 15-20 parts of solvent; 5-15 parts of composite basalt flakes; 0.5-3 parts of graphene oxide with a layered structure; 1-5 parts of dispersant; 1-2 parts of defoamer; 0.5-2 parts of leveling agent; 0.5-2 parts of coupling agent; 0.5-2 parts of anti-settling agent; 0.5-3 parts of corrosion inhibitor; and 15-25 parts of filler.

[0010] The solvent is a combination of at least three of xylene, n-butanol, propylene glycol methyl ether acetate, ethylene glycol monomethyl ether, and diacetone alcohol; the filler is a combination of at least two of precipitated barium sulfate, talc, mica powder, or silicon nitride ceramic powder.

[0011] The components of component B include: 100 parts of composite curing agent; the composite curing agent is a combination of two types of curing agents, namely phenolic amine curing agents and phenolic amine curing agents;

[0012] The components A and B are mixed in a mass ratio of 10:1 to 2.

[0013] Furthermore, the composite epoxy resin is a combination of two or three of DCPD phenol epoxy resin, bisphenol S-type epoxy resin, and polyurethane modified epoxy resin.

[0014] Furthermore, the preparation method of the composite basalt flakes includes the following steps:

[0015] Basalt flakes and silane coupling agent were added to a mixed solvent of anhydrous ethanol and deionized water at a mass ratio of 1:1. The mixture was ultrasonically dispersed for 30 minutes at a temperature of 50–60°C. After centrifugation, the supernatant was removed, and the mixture was placed in an oven and heated at 120°C for 1 hour to obtain composite basalt flakes.

[0016] Furthermore, the mass ratio of the basalt flakes to the silane coupling agent is 100:0.5-2; the mass ratio of the anhydrous ethanol to the deionized water is 1:1; the mesh size of the basalt flakes is 200-250 mesh; and the silane coupling agent is any one or a combination of two of KH550, KH560, and KH570.

[0017] Furthermore, the dispersant is any one or a combination of two of the following: organosiloxane copolymers or hydroxyl functional carboxylic acid ester dispersants containing pigment affinity groups.

[0018] Furthermore, the defoamer is any one or a combination of at least two of the following: silicone defoamers, polyether defoamers, or hydrocarbon oil defoamers.

[0019] Furthermore, the leveling agent is any one or a combination of two of polyester leveling agents or polyether leveling agents.

[0020] Furthermore, the coupling agent is any one or a combination of at least two of silane coupling agents, titanate coupling agents, or aluminate coupling agents.

[0021] Furthermore, the anti-settling agent is one or a combination of two of aluminum stearate or bentonite; the corrosion inhibitor is any one or a combination of at least two of vanadate, molybdate, or phosphate.

[0022] Furthermore, the precipitated barium sulfate has a particle size of 800–1250 mesh, the talc powder has a particle size of 1250–2000 mesh, the mica powder has a particle size of 1250–2000 mesh, and the silicon nitride ceramic powder has a β-phase structure with a particle size of 1–10 μm.

[0023] The second objective of this invention is to provide a method for preparing a seawater-resistant and alkali-resistant anti-corrosion coating, comprising the following steps:

[0024] (1) Add the solvent to the dispersion tank in proportion, add the composite epoxy resin while stirring continuously, and disperse and mix at a speed of 400-600 r / min;

[0025] (2) The composite basalt flakes, dispersant, graphene oxide, coupling agent, filler and anti-settling agent are added to the above dispersion tank in proportion, while stirring. Cooling water is circulated through the wall of the dispersion tank for cooling. The mixture is dispersed and mixed at a speed of 1000-1200 r / min.

[0026] (3) Add corrosion inhibitor, leveling agent and defoamer to the above dispersion tank in proportion, while stirring, and increase the speed to 2800-3200 r / min to disperse and mix, to obtain component A of the coating;

[0027] (4) Component B is obtained by mixing different types of curing agents;

[0028] (5) Mix component A and component B in a dispersion tank according to the specified ratio to obtain a seawater-resistant and alkali-resistant anti-corrosion coating.

[0029] The third objective of this invention is to provide a seawater-resistant and alkali-resistant anti-corrosion coating for use in providing anti-corrosion effects for components in direct hydrogen production equipment without desalination that are in long-term contact with seawater and high-concentration alkali solutions.

[0030] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0031] 1. This invention designs a composite epoxy resin as one of the raw materials for the seawater-resistant and alkali-resistant anticorrosive coating. The composite epoxy resin is formed by combining two or three of DCPD phenol epoxy resin, bisphenol S-type epoxy resin, and polyurethane-modified epoxy resin. In the polyurethane-modified epoxy resin, the polyurethane segments and epoxy resin segments are covalently linked, forming an interpenetrating polymer network structure. The DCPD phenol epoxy resin has a low viscosity, is easy to disperse, and its bicyclopeptide structure also gives the resin good flowability and high crosslinking density. Therefore, whether combined with the two or with bisphenol S-type epoxy resin, a stable composite epoxy resin mixture can be formed without phase separation and with high bonding strength after curing. In addition, since the bisphenol S-type epoxy resin has sulfone groups with high structural polarity and the DCPD phenol epoxy resin has benzene rings with high structural rigidity, both can improve the strength and toughness of the composite epoxy resin after curing. This makes the comprehensive performance of the composite epoxy resin, such as resistance to media, heat resistance, acid and alkali resistance, and glass transition temperature, significantly better than that of conventional epoxy resins.

[0032] 2. The raw materials of the seawater-resistant and alkali-resistant anticorrosive coating of the present invention innovatively use a combination of basalt flakes, graphene oxide, and fillers. Due to the large number of oxygen-containing functional groups on the surface of graphene oxide, the layers are easier to separate, and it can form an effective expanded film or sheet structure in the coating. The basalt flakes, after being pretreated with silane coupling agent, not only have higher alkali corrosion resistance and interfacial compatibility, but also form a protective barrier together with the film or sheet structure of graphene oxide to prevent the penetration of corrosive media such as chloride ions. In addition, the present invention combines a filler mixture with good suspension, good corrosion resistance, and improved impact resistance of the coating, which further modifies the protective barrier and effectively improves the seawater resistance, alkali corrosion resistance, and wear resistance of the anticorrosive coating.

[0033] 3. This invention uses a combination of phenolic amine curing agents and phenolic amine curing agents as a composite curing agent. It not only has the characteristic of curing reaction in low temperature and humid environment, making it suitable for coating production in seawater corrosion conditions, but also has the characteristic of delayed reaction, which can increase the working time of the anti-corrosion coating and facilitate the further formation of an anti-corrosion coating with seawater resistance, alkali corrosion resistance and wear resistance with component A.

[0034] 4. The seawater- and alkali-resistant anti-corrosion coating provided by this invention, composed of components A and B, possesses excellent resistance to both seawater and alkaline corrosion. It provides superior anti-corrosion performance for various components in seawater direct hydrogen production equipment that are in long-term contact with seawater and high-concentration alkaline solutions. Furthermore, it exhibits good stability under high-temperature conditions (e.g., heat exchangers), effectively resisting damage to the coating from alkaline solutions and seawater under high-temperature conditions. Addressing the limitation of existing anti-corrosion technologies that are only applicable to single seawater or alkaline environments, the seawater- and alkali-resistant anti-corrosion coating of this invention can simultaneously meet the requirements of both conditions, demonstrating a more specific and significant technical effect in the field of corrosion protection coatings. Detailed Implementation

[0035] The present invention will be further described below with reference to preferred embodiments. The embodiments given are only for illustrating the present invention and are not intended to limit the scope of the present invention.

[0036] Unless otherwise specified, all materials and reagents used in the following examples are commercially available.

[0037] In the quantitative experiments in the following examples, three replicate experiments were set up, and the average value of the results was taken.

[0038] Unless otherwise specified, the experimental methods described in the following examples are conventional methods.

[0039] Example 1

[0040] This embodiment provides a seawater-resistant and alkali-resistant anti-corrosion coating, the preparation method of which includes the following steps:

[0041] S1. Prepare the raw materials for component A and component B separately, and calculate them according to the following weight parts:

[0042] Component A: 20 parts DCPD phenol epoxy resin, 20 parts bisphenol S-type epoxy resin, 10 parts polyurethane modified epoxy resin, 5 parts xylene, 5 parts n-butanol, 5 parts propylene glycol methyl ether acetate, 5 parts composite basalt flakes, 1 part graphene oxide with a layered structure, 2 parts organosiloxane copolymer dispersant, 1 part organosilicon defoamer, 1 part polyester leveling agent, 1 part KH550, 1 part aluminum stearate anti-settling agent, 1 part vanadate corrosion inhibitor, 8 parts precipitated barium sulfate, 8 parts talc powder, 4 parts mica powder, 2 parts silicon nitride ceramic powder;

[0043] Component B: 40 parts phenolic amine curing agent, 60 parts phenolic amine curing agent;

[0044] S2. Add xylene, n-butanol, and propylene glycol methyl ether acetate to a dispersion tank in proportion. Add DCPD phenol epoxy resin, bisphenol S-type epoxy resin, and polyurethane modified epoxy resin while stirring continuously. Disperse and mix at 500 r / min for 10 min.

[0045] S3. Add the composite basalt flakes, organosiloxane copolymer dispersant, graphene oxide, KH550, precipitated barium sulfate, talc powder, mica powder, silicon nitride ceramic powder, and aluminum stearate anti-settling agent to the above dispersion tank in a certain proportion, stirring while adding, and cooling water is circulated through the wall of the dispersion tank for cooling. Disperse and mix at a speed of 1000 r / min for 10 min.

[0046] S4. Add vanadate corrosion inhibitor, polyester leveling agent and silicone defoamer to the above dispersion tank in proportion, while stirring. Increase the speed to 2800 r / min and stir for 1 hour to obtain component A of the coating.

[0047] S5. Component B is obtained by mixing polyamide curing agent, phenolic amine curing agent and phenolic amine curing agent.

[0048] S6. Mix component A and component B in a dispersion tank at a mass ratio of 10:1.5 to obtain a seawater-resistant and alkali-resistant anti-corrosion coating.

[0049] Example 2

[0050] This embodiment provides a seawater-resistant and alkali-resistant anti-corrosion coating, the preparation method of which includes the following steps:

[0051] S1. Prepare the raw materials for component A and component B separately, and calculate them according to the following weight parts:

[0052] Component A: 15 parts DCPD phenol epoxy resin, 20 parts bisphenol S-type epoxy resin, 15 parts polyurethane modified epoxy resin, 5 parts n-butanol, 5 parts propylene glycol methyl ether acetate, 5 parts diacetone alcohol, 7 parts composite basalt flakes, 1 part graphene oxide with a layered structure, 2.5 parts hydroxyl functional carboxylic acid ester dispersant containing pigment affinity groups, 1.5 parts polyether defoamer, 1 part polyether leveling agent, 0.5 parts KH560, 0.5 parts titanate coupling agent, 0.5 parts aluminate coupling agent, 0.5 parts aluminum stearate anti-settling agent, 1 part bentonite anti-settling agent, 0.5 parts vanadate corrosion inhibitor, 0.5 parts molybdate corrosion inhibitor, 8 parts precipitated barium sulfate, 6 parts talc powder, 4 parts mica powder;

[0053] Component B: 50 parts phenolic amine curing agent, 50 parts phenolic amine curing agent;

[0054] S2. Add n-butanol, propylene glycol methyl ether acetate, and diacetone alcohol to a dispersion tank in proportion. Add DCPD phenol epoxy resin, bisphenol S-type epoxy resin, and polyurethane modified epoxy resin while stirring continuously. Disperse and mix at 400 r / min for 10 min.

[0055] S3. The composite basalt flakes, hydroxyl functional carboxylic acid ester dispersant containing pigment affinity groups, graphene oxide, KH560, titanate coupling agent, aluminate coupling agent, precipitated barium sulfate, talc powder, mica powder, aluminum stearate anti-settling agent, and bentonite anti-settling agent are added to the above dispersion tank in proportion, while stirring. Cooling water is circulated through the wall of the dispersion tank for cooling. The mixture is dispersed and mixed at a speed of 1000 r / min for 10 min.

[0056] S4. Add vanadate corrosion inhibitor, molybdate corrosion inhibitor, polyether leveling agent, and polyether defoamer to the above dispersion tank in proportion, while stirring. Increase the rotation speed to 3000 r / min and stir for 1 hour to obtain component A of the coating.

[0057] S5. Component B is obtained by mixing phenolic amine curing agent and phenolic amine curing agent;

[0058] S6. Mix component A and component B in a dispersion tank at a mass ratio of 10:1.5 to obtain a seawater-resistant and alkali-resistant anti-corrosion coating.

[0059] Example 3

[0060] This embodiment provides a seawater-resistant and alkali-resistant anti-corrosion coating, the preparation method of which includes the following steps:

[0061] S1. Prepare the raw materials for component A and component B separately, and calculate them according to the following weight parts:

[0062] Component A: 30 parts bisphenol S-type epoxy resin, 20 parts polyurethane modified epoxy resin, 5 parts xylene, 5 parts propylene glycol methyl ether acetate, 5 parts ethylene glycol monomethyl ether, 7 parts composite basalt flakes, 2 parts graphene oxide with a lamellar structure, 2 parts organosiloxane copolymer dispersant, 1 part polyether defoamer, 1 part polyether leveling agent, 0.5 parts titanate coupling agent, 0.5 parts aluminate coupling agent, 1 part bentonite anti-settling agent, 1 part phosphate corrosion inhibitor, 6 parts precipitated barium sulfate, 6 parts talc powder, 3 parts mica powder, 4 parts silicon nitride ceramic powder;

[0063] Component B: 45 parts phenolic amine curing agent, 55 parts phenolic amine curing agent;

[0064] S2. Add xylene, propylene glycol methyl ether acetate, and ethylene glycol monomethyl ether to a dispersion tank in proportion. Add bisphenol S-type epoxy resin and polyurethane modified epoxy resin while stirring continuously. Disperse and mix at 500 r / min for 10 min.

[0065] S3. The composite basalt flakes, organosiloxane copolymer dispersant, graphene oxide, titanate coupling agent, aluminate coupling agent, precipitated barium sulfate, talc powder, mica powder, silicon nitride ceramic powder, and bentonite anti-settling agent are added to the above dispersion tank in proportion, while stirring. Cooling water is circulated through the wall of the dispersion tank for cooling. The mixture is dispersed and mixed at a speed of 1100 r / min for 10 min.

[0066] S4. Add the phosphate corrosion inhibitor, polyether leveling agent, and polyether defoamer to the above dispersion tank in proportion, stirring while adding, increasing the speed to 3000 r / min, and stirring and dispersing for 1 hour to obtain component A of the coating.

[0067] S5. Component B is obtained by mixing polyamide curing agent, phenolic amine curing agent and phenolic amine curing agent.

[0068] S6. Mix component A and component B in a dispersion tank at a mass ratio of 10:2 to obtain a seawater-resistant and alkali-resistant anti-corrosion coating.

[0069] Example 4

[0070] This embodiment provides a method for preparing a seawater-resistant and alkali-resistant anti-corrosion coating, comprising the following steps:

[0071] S1. Prepare the raw materials for component A and component B separately, and calculate them according to the following weight parts:

[0072] Component A: 14 parts DCPD phenol epoxy resin, 14 parts bisphenol S-type epoxy resin, 14 parts polyurethane modified epoxy resin, 7 parts xylene, 5 parts n-butanol, 5 parts diacetone alcohol, 8 parts composite basalt flakes, 1 part graphene oxide with a layered structure, 2 parts hydroxyl functional carboxylic acid ester dispersant containing pigment affinity groups, 1 part hydrocarbon oil defoamer, 1 part polyester leveling agent, 1 part KH550, 1 part aluminum stearate anti-settling agent, 1 part molybdate corrosion inhibitor, 8 parts precipitated barium sulfate, 8 parts talc powder, 4 parts mica powder, 5 parts silicon nitride ceramic powder;

[0073] Component B: 30 parts phenolamine curing agent, 70 parts phenolic amine curing agent;

[0074] S2. Add xylene, n-butanol, and diacetone alcohol to a dispersion tank in proportion. Add DCPD phenol epoxy resin, bisphenol S-type epoxy resin, and polyurethane modified epoxy resin while stirring continuously. Disperse and mix at 600 r / min for 10 min.

[0075] S3. The composite basalt flakes, hydroxyl functional carboxylic acid ester dispersant containing pigment affinity groups, graphene oxide, KH550, precipitated barium sulfate, talc powder, mica powder, silicon nitride ceramic powder, and aluminum stearate anti-settling agent are added to the above dispersion tank in proportion, while stirring. Cooling water is circulated through the wall of the dispersion tank for cooling. The mixture is dispersed and mixed at a speed of 1200 r / min for 10 min.

[0076] S4. Add molybdate corrosion inhibitor, polyester leveling agent, and hydrocarbon oil defoamer to the above dispersion tank in proportion, while stirring. Increase the rotation speed to 3200 r / min and stir for 1 hour to obtain component A of the coating.

[0077] S5. Component B is obtained by mixing polyamide curing agent and phenolic amine curing agent;

[0078] S6. Mix component A and component B in a dispersion tank at a mass ratio of 10:1 to obtain a seawater-resistant and alkali-resistant anti-corrosion coating.

[0079] Example 5

[0080] This embodiment provides a method for preparing a seawater-resistant and alkali-resistant anti-corrosion coating, comprising the following steps:

[0081] S1. Prepare the raw materials for component A and component B separately, and calculate them according to the following weight parts:

[0082] Component A: 25 parts DCPD phenol epoxy resin, 25 parts bisphenol S-type epoxy resin, 5 parts xylene, 5 parts n-butanol, 5 parts ethylene glycol monomethyl ether, 10 parts composite basalt flakes, 1 part graphene oxide with a layered structure, 2 parts organosiloxane copolymer dispersant, 1 part organosilicon defoamer, 1 part polyester leveling agent, 1 part KH570, 1 part aluminate coupling agent, 1 part aluminum stearate anti-settling agent, 1 part vanadate corrosion inhibitor, 1 part phosphate corrosion inhibitor, 5 parts precipitated barium sulfate, 5 parts talc powder, 3 parts mica powder, 2 parts silicon nitride ceramic powder;

[0083] Component B: 35 parts phenolic amine curing agent, 65 parts phenolic amine curing agent;

[0084] S2. Add xylene, n-butanol, and ethylene glycol monomethyl ether to a dispersion tank in proportion. Add DCPD phenol epoxy resin and bisphenol S-type epoxy resin while stirring continuously. Disperse and mix at 500 r / min for 10 min.

[0085] S3. The composite basalt flakes, organosiloxane copolymer dispersant, graphene oxide, KH570, aluminate coupling agent, precipitated barium sulfate, talc powder, mica powder, silicon nitride ceramic powder, and aluminum stearate anti-settling agent are added to the above dispersion tank in proportion, while stirring. Cooling water is circulated through the wall of the dispersion tank for cooling. The mixture is dispersed and mixed at a speed of 1200 r / min for 10 min.

[0086] S4. Add vanadate corrosion inhibitor, phosphate corrosion inhibitor, polyester leveling agent and silicone defoamer to the above dispersion tank in proportion, while stirring. Increase the speed to 3000 r / min and stir for 1 hour to obtain component A of the coating.

[0087] S5. Component B is obtained by mixing polyamide curing agent, phenolic amine curing agent and phenolic amine curing agent.

[0088] S6. Mix component A and component B in a dispersion tank at a mass ratio of 10:2 to obtain a seawater-resistant and alkali-resistant anti-corrosion coating.

[0089] Example 6

[0090] This embodiment provides a method for preparing a seawater-resistant and alkali-resistant anti-corrosion coating, comprising the following steps:

[0091] S1. Prepare the raw materials for component A and component B separately, and calculate them according to the following weight parts:

[0092] Component A: 20 parts DCPD phenol epoxy resin, 15 parts bisphenol S-type epoxy resin, 5 parts polyurethane modified epoxy resin, 5 parts xylene, 5 parts n-butanol, 5 parts diacetone alcohol, 15 parts composite basalt flakes, 3 parts graphene oxide with a layered structure, 5 parts organosiloxane copolymer dispersant, 2 parts organosilicon defoamer, 1 part polyester leveling agent, 1 part polyether leveling agent, 2 parts KH570, 2 parts aluminum stearate anti-settling agent, 1 part vanadate corrosion inhibitor, 1 part phosphate corrosion inhibitor, 1 part molybdate corrosion inhibitor, 5 parts precipitated barium sulfate, 5 parts talc powder, 3 parts mica powder, 2 parts silicon nitride ceramic powder;

[0093] Component B: 35 parts phenolic amine curing agent, 65 parts phenolic amine curing agent;

[0094] S2. Add xylene, n-butanol, and diacetone alcohol to a dispersion tank in proportion. Add DCPD phenol epoxy resin, polyurethane modified epoxy resin, and bisphenol S-type epoxy resin while stirring continuously. Disperse and mix at 500 r / min for 10 min.

[0095] S3. Add the composite basalt flakes, graphene oxide, organosiloxane copolymer dispersant, KH570, aluminum stearate anti-settling agent, precipitated barium sulfate, talc powder, mica powder, and silicon nitride ceramic powder to the above dispersion tank in a certain proportion, stirring while adding, and cooling water is circulated through the wall of the dispersion tank for cooling. Disperse and mix at a speed of 1200 r / min for 10 min.

[0096] S4. Add vanadate corrosion inhibitor, phosphate corrosion inhibitor, molybdate corrosion inhibitor, polyester leveling agent, polyether leveling agent, and silicone defoamer to the above dispersion tank in proportion, while stirring. Increase the rotation speed to 3000 r / min and stir for 1 hour to obtain component A of the coating.

[0097] S5, phenolic amine curing agent, and phenolic amine curing agent are mixed to obtain component B;

[0098] S6. Mix component A and component B in a dispersion tank at a mass ratio of 10:2 to obtain a seawater-resistant and alkali-resistant anti-corrosion coating.

[0099] Example 7

[0100] This embodiment provides a method for preparing a seawater-resistant and alkali-resistant anti-corrosion coating, comprising the following steps:

[0101] S1. Prepare the raw materials for component A and component B separately, and calculate them according to the following weight parts:

[0102] Component A: 20 parts DCPD phenol epoxy resin, 20 parts bisphenol S-type epoxy resin, 20 parts polyurethane modified epoxy resin, 5 parts xylene, 5 parts n-butanol, 10 parts ethylene glycol monomethyl ether, 5 parts composite basalt flakes, 0.5 parts graphene oxide with a layered structure, 1 part hydroxyl functional carboxylic acid ester dispersant containing pigment affinity groups, 1 part silicone defoamer, 0.5 parts polyester leveling agent, 0.5 parts KH550, 0.5 parts bentonite anti-settling agent, 0.5 parts molybdate corrosion inhibitor, 5.5 parts precipitated barium sulfate, 5 parts talc powder, 3 parts mica powder, 2 parts silicon nitride ceramic powder;

[0103] Component B: 35 parts phenolic amine curing agent, 65 parts phenolic amine curing agent;

[0104] S2. Add xylene, n-butanol, and ethylene glycol monomethyl ether to a dispersion tank in proportion. Add DCPD phenol epoxy resin, polyurethane modified epoxy resin, and bisphenol S-type epoxy resin while stirring continuously. Disperse and mix at 500 r / min for 10 min.

[0105] S3. The composite basalt flakes, hydroxyl functional carboxylic acid ester dispersant containing pigment affinity groups, graphene oxide, KH550, precipitated barium sulfate, talc powder, mica powder, silicon nitride ceramic powder, and bentonite anti-settling agent are added to the above dispersion tank in proportion, while stirring. Cooling water is circulated through the wall of the dispersion tank for cooling. The mixture is dispersed and mixed at a speed of 1200 r / min for 10 min.

[0106] S4. Add molybdate corrosion inhibitor, polyester leveling agent and silicone defoamer to the above dispersion tank in proportion, while stirring. Increase the speed to 3000 r / min and stir for 1 hour to obtain component A of the coating.

[0107] S5. Component B is obtained by mixing phenolic amine curing agent and phenolic amine curing agent;

[0108] S6. Mix component A and component B in a dispersion tank at a mass ratio of 10:1 to obtain a seawater-resistant and alkali-resistant anti-corrosion coating.

[0109] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A seawater- and alkali-resistant anti-corrosion coating, characterized in that, The anti-corrosion coating is composed of component A and component B. Component A, by weight, comprises: 40-60 parts composite epoxy resin; 15-20 parts solvent; 5-15 parts composite basalt flakes; 0.5-3 parts graphene oxide with a layered structure; 1-5 parts dispersant; 1-2 parts defoamer; 0.5-2 parts leveling agent; 0.5-2 parts coupling agent; 0.5-2 parts anti-settling agent; 0.5-3 parts corrosion inhibitor; and 15-25 parts filler. The solvent is a combination of at least three of xylene, n-butanol, propylene glycol methyl ether acetate, ethylene glycol monomethyl ether, and diacetone alcohol; the filler is a combination of at least two of precipitated barium sulfate, talc, mica powder, or silicon nitride ceramic powder. The components of component B include: 100 parts of composite curing agent; the composite curing agent is a phenolic amine curing agent and a phenolic amine curing agent; The components A and B are mixed at a mass ratio of 10:1~2; The composite epoxy resin is a combination of two or three of DCPD phenol epoxy resin, bisphenol S-type epoxy resin and polyurethane modified epoxy resin. The preparation method of the composite basalt flakes includes the following steps: Basalt flakes and silane coupling agent were added to a mixed solvent of anhydrous ethanol and deionized water at a mass ratio of 1:

1. The mixture was ultrasonically dispersed for 30 minutes at a temperature of 50-60°C. After centrifugation, the supernatant was removed, and the mixture was placed in an oven and heated at 120°C for 1 hour to obtain composite basalt flakes.

2. The seawater-resistant and alkali-resistant anti-corrosion coating according to claim 1, characterized in that, The mass ratio of basalt flakes to silane coupling agent is 100:0.5~2; the mass ratio of anhydrous ethanol to deionized water is 1:1; the mesh size of the basalt flakes is 200~250 mesh; the silane coupling agent is any one or a combination of two of KH550, KH560 and KH570.

3. The seawater-resistant and alkali-resistant anti-corrosion coating according to claim 1, characterized in that, The dispersant is any one or a combination of two of the following: organosiloxane copolymers or hydroxyl functional carboxylic acid ester dispersants containing pigment affinity groups; the defoamer is any one or a combination of at least two of the following: organosilicon defoamers, polyether defoamers, or hydrocarbon oil defoamers.

4. The seawater-resistant and alkali-resistant anti-corrosion coating according to claim 1, characterized in that, The leveling agent is any one or a combination of two of polyester leveling agents or polyether leveling agents; the coupling agent is any one or a combination of at least two of silane coupling agents, titanate coupling agents, or aluminate coupling agents.

5. The seawater-resistant and alkali-resistant anti-corrosion coating according to claim 1, characterized in that, The anti-settling agent is one or a combination of two of aluminum stearate or bentonite; the corrosion inhibitor is any one or a combination of at least two of vanadate, molybdate or phosphate.

6. The seawater-resistant and alkali-resistant anti-corrosion coating according to claim 1, characterized in that, The precipitated barium sulfate has a particle size of 800-1250 mesh, the talc powder has a particle size of 1250-2000 mesh, the mica powder has a particle size of 1250-2000 mesh, and the silicon nitride ceramic powder has a β-phase structure with a particle size of 1-10 μm.

7. A method for preparing a seawater-resistant and alkali-resistant anticorrosive coating according to any one of claims 1-6, characterized in that, Includes the following steps: (1) Add the solvent to the dispersion tank in proportion, add the composite epoxy resin while stirring continuously, and disperse and mix at a speed of 400~600r / min; (2) The composite basalt flakes, dispersant, graphene oxide, coupling agent, filler and anti-settling agent are added to the above dispersion tank in proportion, while stirring. Cooling water is circulated through the wall of the dispersion tank for cooling. The mixture is dispersed and mixed at a speed of 1000~1200 r / min. (3) Add the corrosion inhibitor, leveling agent and defoamer to the above dispersion tank in proportion, stirring while adding, and increase the rotation speed to 2800~3200 r / min to disperse and mix, and obtain component A of the coating; (4) Component B is obtained by mixing different types of curing agents; (5) Mix component A and component B in a dispersion tank according to the ratio to obtain a seawater-resistant and alkali-resistant anti-corrosion coating.

8. The application of a seawater-resistant and alkali-resistant anti-corrosion coating according to any one of claims 1-6 in providing anti-corrosion effect for components in a direct hydrogen production equipment without desalination that are in long-term contact with seawater and high-concentration alkali solutions.