A high-adhesion, ultra-heavy anti-corrosion coating technology

Abstract

The present invention discloses a high-adhesion, ultra-heavy anti-corrosion coating technology. The ultra-heavy anti-corrosion coating consists of two parts: component A and component B. Component A includes the following raw materials by weight: 40-60 parts epoxy resin, 5-10 parts modified polyarylether nitrile, 1-15 parts diluent, 1-10 parts functional filler, 1-15 parts pigment, and 0.1-3 parts auxiliary agent; and component B includes the following raw materials by weight: 5-25 parts polyamide epoxy curing agent, 5-25 parts phenalkamine epoxy curing agent, and 0.1-3 parts accelerator. The present invention, through a special molecular structure design and a rational combination of functional fillers, can form a dense, dry, and stable protective layer, and significantly improve the adhesion between the coating and the substrate, thereby providing long-term and effective protection for metal structures.

Description

Technical Field

[0001] The present invention relates to the technical field of coatings, and in particular to a high-adhesion, super-heavy anti-corrosion coating technology. Background Art

[0002] With the development of industrialization, steel structures, bridges, offshore platforms, petrochemical equipment, ships, and other facilities are exposed to severe corrosion problems due to long-term use in harsh environments. In particular, metal surfaces exposed to seawater, acidic and alkaline gases, salt spray, and damp heat are susceptible to corrosion, leading to reduced equipment performance, shortened service life, and even safety hazards. Therefore, anti-corrosion protection for these facilities has become a critical issue that cannot be ignored in engineering projects.

[0003] Traditional anti-corrosion coatings, such as conventional epoxy and polyurethane coatings, while effective, have limited corrosion resistance, adhesion, and impact resistance in extreme environments. This is especially true for facilities exposed to long-term seawater immersion or high humidity and salinity environments. Conventional coatings struggle to provide adequate protection, leading to coating failure, peeling, blistering, and other issues, which in turn accelerate metal corrosion.

[0004] In recent years, advances in solvent-free epoxy coating technology have led to improvements in environmental friendliness, thickness, and corrosion resistance. However, existing solvent-free coatings still leave room for improvement in applications requiring high adhesion and impact resistance. The presence of rust or moisture on metal surfaces can limit the coating's anti-corrosion effectiveness, leading to decreased adhesion and even delamination. Therefore, there is a need to develop a heavy-duty anti-corrosion coating that exhibits excellent adhesion, corrosion resistance, and strength in harsh environments. Summary of the Invention

[0005] Based on the problems existing in the background technology, the present invention provides a high-adhesion super-heavy anti-corrosion coating technology. Through the special molecular structure design and the reasonable combination of functional fillers, it can form a dense, dry and stable protective layer, and significantly improve the adhesion between the coating and the substrate, thereby providing long-term and effective protection for metal structures.

[0006] The present invention is implemented through the following technical solutions:

[0007] A high-adhesion, super-heavy anti-corrosion coating, consisting of component A and component B, wherein component A comprises the following raw materials in parts by weight: 40-60 parts of epoxy resin, 5-10 parts of modified polyarylethernitrile, 1-15 parts of diluent, 1-10 parts of functional filler, 1-15 parts of pigment, and 0.1-3 parts of additive;

[0008] Component B comprises the following raw materials in parts by weight: 5-25 parts of polyamide epoxy curing agent, 5-25 parts of phenalkamine epoxy curing agent, and 0.1-3 parts of accelerator.

[0009] Furthermore, the epoxy resin is at least one of bisphenol A epoxy resin, bisphenol F epoxy resin, and novolac epoxy resin.

[0010] Furthermore, the preparation method of the modified polyarylether nitrile is specifically as follows: reactants 2,6-dichlorobenzonitrile, bisphenol A, and phenolphthalein are added to a reactor equipped with an agitator, a condensing reflux pipe, and a water separator; a catalyst anhydrous potassium carbonate, a water-carrying agent toluene, and a solvent N-methylpyrrolidone are continuously added; the temperature is raised to 140-150° C. for azeotropic dehydration; the toluene is then distilled off; the temperature is further raised to 190° C.; the reaction enters a polymerization stage; as the reaction proceeds, the viscosity of the solution system increases; when the viscosity of the system becomes constant, the reaction is stopped; the polymer is poured into a mixed solution of dilute hydrochloric acid and ethanol while hot; a large amount of white polymer solid is precipitated; the polymer solid is placed in a grinder for crushing; and then repeatedly boiled with a large amount of hot water for purification; the purified powder is dried to obtain the modified polyarylether nitrile.

[0011] Furthermore, the molar ratio of 2,6-dichlorobenzonitrile, bisphenol A, and phenolphthalein is 1:(0.6-0.8):(0.2-0.4).

[0012] Furthermore, the diluent is ethylene glycol diglycidyl ether.

[0013] Furthermore, the functional filler is a MoS2@Zn-MOF derived carbon nanomaterial, and its preparation method includes the following steps:

[0014] (1) Preparation of Zn-MOF: Zn(NO3)2·6H2O and 2-MeIM were dissolved in methanol solution respectively, stirred vigorously, and then the methanol solution containing 2-MeIM was slowly dropped into the methanol solution containing Zn(NO3)2·6H2O, stirred, allowed to stand, and centrifuged to collect the white product, which was washed with methanol several times. The white solid was dried in a vacuum oven to obtain the obtained Zn-MOF;

[0015] (2) Preparation of Zn-MOF-derived carbon: Grind the white Zn-MOF solid into powder, place it in a tube furnace and calcine it at 800°C under N2 atmosphere to obtain black Zn-MOF-derived carbon;

[0016] (3) Preparation of MoS2@Zn-MOF derived carbon: Zn-MOF derived carbon was dispersed in deionized water, and Na2MoO4·2H2O and CH4N2S were added and stirred, and ultrasonically dissolved. The obtained solution was transferred to a stainless steel autoclave lined with polytetrafluoroethylene and subjected to solvent thermal reaction at 200°C. After the reaction was completed, the autoclave was naturally cooled to room temperature, the precipitate was collected by centrifugation, washed, and finally dried in a vacuum oven to obtain MoS2@Zn-MOF derived carbon nanomaterials.

[0017] Furthermore, the pigment is at least one of titanium dioxide, iron black powder, iron red powder, natural barium sulfate, precipitated barium sulfate, talcum powder, silica ion exchange type anti-rust pigment, and bentonite.

[0018] Furthermore, the auxiliary agent includes a dispersant, a defoaming agent, a leveling agent and a coupling agent, wherein the dispersant is an acrylic dispersant; the defoaming agent is a silicone defoaming agent; the leveling agent is an acrylic leveling agent; and the coupling agent is a silane coupling agent.

[0019] Furthermore, the curing accelerator is 2,4,6-tris(dimethylaminomethyl)phenol.

[0020] Furthermore, the weight ratio of component A to component B is 2-10:1.

[0021] Beneficial effects of the present invention:

[0022] (1) The high-adhesion, heavy-duty anti-corrosion coating of the present invention has the following advantages: no solvent, no dew point restriction, high edge retention, extremely resistant to moisture, good compatibility with surface-attached iron oxides, excellent adhesion to dry or wet steel surfaces, the ability to react with steel and wet oxidized surfaces, no strict requirements on surface roughness, and longer application time and long-lasting anti-corrosion life. The high-adhesion, heavy-duty anti-corrosion coating of the present invention has an exceptional adhesion of 12-42 MPa on dry and wet surfaces.

[0023] (2) The high-adhesion, heavy-duty anti-corrosion coating of the present invention incorporates modified polyarylethernitrile. The polyarylethernitrile exhibits excellent mechanical strength, toughness, and heat resistance, effectively improving the brittleness of epoxy resin coatings and preventing metal corrosion caused by stress concentration cracking. The modified polyarylethernitrile incorporates carboxylic acid side groups, which can form a stable cross-linked network structure with the epoxy resin through chemical bonds. The formation of such covalent bonds enhances the cohesive strength of the coating and the adhesion between the coating and the substrate.

[0024] (3) By introducing MoS2@Zn-MOF-derived carbon nanomaterials, the coating forms a highly dense barrier structure that effectively blocks the penetration of moisture, oxygen, and corrosive media. The corrosion inhibition of Zn combined with the lubricity and wear resistance of MoS2 ensures that the coating maintains excellent protection in long-term corrosive environments.

[0025] (4) The present invention adopts polyamide epoxy curing agent and phenolic amine epoxy curing agent. The molecular structure of polyamide curing agent contains more active hydrogen, groups that promote epoxy resin curing and hydrophobic groups, and has high reaction activity; the phenolic skeleton structure of phenolic amine epoxy curing agent can further improve the heat resistance and corrosion resistance of epoxy coating, and is particularly suitable for use in cold seasons or occasions with low ambient temperature. It can cure epoxy resin under environmental conditions such as around 0°C, 100% humid environment and underwater. DETAILED DESCRIPTION

[0026] The technical solution of the present invention is further described in detail below with reference to specific embodiments, but the protection scope of the present invention is not limited to the following embodiments.

[0027] In the embodiments and comparative examples of the present invention, the epoxy resin is bisphenol A epoxy resin; the diluent is ethylene glycol diglycidyl ether; the pigment is iron oxide red powder; the dispersant is acrylic dispersant Sokalan CP9; the defoamer is silicone defoamer RP-6068 from Scichem; the leveling agent is acrylic leveling agent BYK358N; the coupling agent is silane coupling agent KH560; the polyamide epoxy curing agent DEH140; the phenalkamine epoxy curing agent T31; and the curing accelerator is 2,4,6-tris(dimethylaminomethyl)phenol.

[0028] Example 1

[0029] A high-adhesion, super-heavy anti-corrosion coating, consisting of component A and component B, wherein component A comprises the following raw materials in parts by weight: 50 parts of epoxy resin, 15 parts of modified polyarylether nitrile, 6 parts of diluent, 5 parts of functional filler, 10 parts of pigment, 0.5 parts of dispersant, 0.3 parts of defoamer, 0.5 parts of leveling agent, and 1.0 parts of coupling agent;

[0030] Component B includes the following raw materials in parts by weight: 15 parts of polyamide epoxy curing agent, 10 parts of phenolic amine epoxy curing agent, and 1.0 part of accelerator.

[0031] The weight ratio of component A to component B is 2:1.

[0032] The preparation method of the modified polyarylether nitrile is as follows: reactants 2,6-dichlorobenzonitrile, bisphenol A, and phenolphthalein are added to a reactor in a molar ratio of 1:0.7:0.3. The reactor is equipped with a stirrer, a condensing reflux pipe, and a water separator. A catalyst, anhydrous potassium carbonate, a water-carrying agent, toluene, and a solvent, N-methylpyrrolidone, are continuously added. The temperature is raised to 140-150° C. for azeotropic dehydration. The toluene is then evaporated and the temperature is continued to be raised to 190° C. The reaction enters a polymerization stage. As the reaction proceeds, the viscosity of the solution system increases. When the viscosity of the system becomes constant, the reaction is stopped. The polymer is poured into a mixed solution of dilute hydrochloric acid and ethanol while hot to precipitate a large amount of white polymer solid. The polymer solid is placed in a grinder for crushing, and then repeatedly boiled with a large amount of hot water for purification. The purified powder is dried to obtain the modified polyarylether nitrile.

[0033] The functional filler is a MoS2@Zn-MOF derived carbon nanomaterial, and its preparation method includes the following steps:

[0034] (1) Preparation of Zn-MOF: 2.5 parts of Zn(NO3)2·6H2O and 3.382 parts of 2-MeIM were dissolved in 150 parts of methanol solution respectively, and stirred vigorously. Then, the methanol solution containing 2-MeIM was slowly added dropwise to the methanol solution containing Zn(NO3)2·6H2O, and stirred for 4 hours. The mixture was allowed to stand and the white product was collected by centrifugation. The product was washed with methanol several times and the white solid was dried in a vacuum oven to obtain Zn-MOF.

[0035] (2) Preparation of Zn-MOF-derived carbon: Grind the white Zn-MOF solid into powder, place it in a tube furnace and calcine it at 800°C under N2 atmosphere to obtain black Zn-MOF-derived carbon;

[0036] (3) Preparation of MoS2@Zn-MOF derived carbon: 3.2 parts of Zn-MOF derived carbon were dispersed in deionized water, 14.4 parts of Na2MoO4·2H2O and 17.1 parts of CH4N2S were added, stirred, and dissolved by ultrasonication. The obtained solution was transferred to a stainless steel autoclave lined with polytetrafluoroethylene and subjected to solvent thermal reaction at 200°C. After the reaction was completed, the autoclave was naturally cooled to room temperature, the precipitate was collected by centrifugation, washed, and finally dried in a vacuum oven to obtain MoS2@Zn-MOF derived carbon nanomaterials.

[0037] Example 2

[0038] The difference from Example 1 is that component A includes the following raw materials in parts by weight: 50 parts of epoxy resin, 10 parts of modified polyarylether nitrile, 6 parts of diluent, 5 parts of functional filler, 10 parts of pigment, 0.5 parts of dispersant, 0.3 parts of defoamer, 0.5 parts of leveling agent and 1.0 parts of coupling agent.

[0039] The rest are the same as in Example 1.

[0040] Example 3

[0041] The difference from Example 1 is that component A includes the following raw materials in parts by weight: 50 parts of epoxy resin, 15 parts of modified polyarylether nitrile, 6 parts of diluent, 8 parts of functional filler, 10 parts of pigment, 0.5 parts of dispersant, 0.3 parts of defoamer, 0.5 parts of leveling agent and 1.0 parts of coupling agent.

[0042] The rest are the same as in Example 1.

[0043] Comparative Example 1

[0044] The difference from Example 1 is that component A includes the following raw materials in parts by weight: 50 parts of epoxy resin, 6 parts of diluent, 5 parts of functional filler, 10 parts of pigment, 0.5 parts of dispersant, 0.3 parts of defoamer, 0.5 parts of leveling agent and 1.0 parts of coupling agent.

[0045] The rest are the same as in Example 1.

[0046] Comparative Example 2

[0047] The difference from Example 1 is that component A includes the following raw materials in parts by weight: 50 parts of epoxy resin, 15 parts of polyarylether nitrile, 6 parts of diluent, 5 parts of functional filler, 10 parts of pigment, 0.5 parts of dispersant, 0.3 parts of defoamer, 0.5 parts of leveling agent and 1.0 parts of coupling agent.

[0048] The rest are the same as in Example 1.

[0049] Comparative Example 3

[0050] The difference from Example 1 is that the preparation method of the modified polyarylene ether nitrile is specifically as follows: reactants 2,6-dichlorobenzonitrile, bisphenol A, and phenolphthalein are added to a reactor in a molar ratio of 1:0.5:0.5, the reactor being equipped with a stirrer, a condenser reflux tube, and a water separator, and then anhydrous potassium carbonate catalyst, water-carrying agent toluene, and solvent N-methylpyrrolidone are added, the temperature is raised to 140-150° C. for azeotropic dehydration, the toluene is then distilled off, and the temperature is continued to be raised to 190° C. The reaction enters the polymerization stage, and as the reaction proceeds, the viscosity of the solution system increases. When the viscosity of the system becomes constant, the reaction is stopped, and the polymer is poured into a mixed solution of dilute hydrochloric acid and ethanol while hot to precipitate a large amount of white polymer solid, the polymer solid is placed in a grinder for pulverization, and then repeatedly boiled with a large amount of hot water for purification, and the purified powder is dried to obtain the modified polyarylene ether nitrile.

[0051] The rest are the same as in Example 1.

[0052] Comparative Example 4

[0053] The difference from Example 1 is that component A includes the following raw materials in parts by weight: 50 parts of epoxy resin, 15 parts of modified polyarylether nitrile, 6 parts of diluent, 10 parts of pigment, 0.5 parts of dispersant, 0.3 parts of defoamer, 0.5 parts of leveling agent and 1.0 parts of coupling agent.

[0054] The rest are the same as in Example 1.

[0055] Comparative Example 5

[0056] The difference from Example 1 is that the functional filler is MoS2@Zn-MOF nanomaterial, and its preparation method includes the following steps:

[0057] (1) Preparation of Zn-MOF: 2.5 parts of Zn(NO3)2·6H2O and 3.382 parts of 2-MeIM were dissolved in 150 parts of methanol solution respectively, and stirred vigorously. Then, the methanol solution containing 2-MeIM was slowly added dropwise to the methanol solution containing Zn(NO3)2·6H2O, and stirred for 4 hours. The mixture was allowed to stand and the white product was collected by centrifugation. The product was washed with methanol several times and the white solid was dried in a vacuum oven to obtain Zn-MOF.

[0058] (2) Preparation of MoS2@Zn-MOF: 3.2 parts of Zn-MOF were dispersed in deionized water, 14.4 parts of Na2MoO4·2H2O and 17.1 parts of CH4N2S were added, stirred, and dissolved by ultrasonication. The resulting solution was transferred to a stainless steel autoclave lined with polytetrafluoroethylene and subjected to solvothermal reaction at 200°C. After the reaction was completed, the autoclave was naturally cooled to room temperature, the precipitate was collected by centrifugation, washed, and finally dried in a vacuum oven to obtain MoS2@Zn-MOF nanomaterials.

[0059] Specifically, a patch that does not react with the solution is placed at the bottom of the inner side of the container for collecting the precipitate by centrifugation.

[0060] Preferably, the patch is fixed to the bottom inside the container, and the color of the patch is selected based on the color of the solution; if the solution color is light, the patch color is selected black; if the solution color is dark, the patch color is selected white.

[0061] Specifically, the patch in the solution to be tested is photographed by a camera set on the top of the container, and the photographed image is processed. The image is edge-graphic processed based on the edge detection algorithm, and the background is filled according to the seed filling algorithm. The image is segmented to obtain multiple areas, and the segmented areas are marked and merged.

[0062] Preferably, according to edge contour extraction, the quasi-coordinates of the target area corresponding to the patch are obtained, and the grayscale value of the patch in the quasi-coordinates of the target area, the grayscale value of the background with the same area as the patch, and the grayscale value of the precipitation area are calculated respectively, wherein the grayscale value is calculated as follows:

[0063] Gray=0.299R+0.578G+0.114B

[0064] Among them, R, G, and B respectively represent the values ​​of red, green, and blue colors in the image based on the RGB standard.

[0065] Subsequently, the Euclidean distance is used as a measure of the difference between the grayscale value of the patch in the target area and the grayscale value of the background of the same area, and the turbidity of the tested solution is determined from this.

[0066]

[0067] Where T is the turbidity of the target solution; dex and y are the horizontal and vertical coordinates; n and m are the image pixel sizes; g is the grayscale value of the patch; and g' is the grayscale value of the background of the same area.

[0068] Specifically, based on the calculated turbidity of the target solution, it is determined whether a preset condition is met, thereby controlling the stopping or maintaining of the centrifugal operation.

[0069] Preferably, when the turbidity of the target solution is less than a preset turbidity threshold, it is determined that the preset condition is met, and the centrifugal device is controlled to stop the centrifugal operation; when the turbidity of the target solution is not less than the preset turbidity threshold, it is determined that the preset condition is not met, and the centrifugal device is controlled to continue the centrifugal operation.

[0070] Preferably, the turbidity of the target solution is detected based on a preset time interval to control the centrifugation operation; wherein the preset time interval is determined according to actual needs and is not limited here.

[0071] Furthermore, after stopping the centrifugation operation, the edge of the precipitation area is determined using Canny edge detection, and the RGB color vector of the precipitation area is obtained, and the grayscale value of the precipitation area is calculated; for the edge of the precipitation area, the number of acute angles on the edge is determined, and the average number of acute angles per unit length is further calculated. If the average number of acute angles per unit length is greater than a preset number, the edge of the precipitation area is determined to be rough; if the average number of acute angles per unit length is not greater than the preset number, the edge of the precipitation area is determined to be smooth.

[0072] Furthermore, judging whether the grayscale value of the precipitation area is greater than a preset grayscale value;

[0073] When the edge of the sedimentation area is smooth and the grayscale value is greater than the preset grayscale value, it is determined that the sedimentation effect meets the collection requirements and the collection operation is performed; otherwise, it is determined that centrifugation and sedimentation operations are required.

[0074] Test example

[0075] The performance tests of the anticorrosive coatings prepared in Examples 1-3 and Comparative Examples 1-5 were conducted. The test items and methods are as follows:

[0076] Adhesion test (wet surface, dry surface) (unit: MPa): ASTM standard D4541

[0077] Abrasion resistance (unit: g / week (1000 weeks / 1kg)): ASTM D4060

[0078] Impact resistance (unit: KgF / cm 2 ): ASTM D4060

[0079] Maximum elongation (in %): ISO / R527

[0080] Compressive strength (unit: KgF / cm 2 ): ISO 844

[0081] Bending strength (unit: KgF / cm 2 ): ISO 178

[0082] Condensation resistance (unit: h): ASTM standard D4585

[0083] Water absorption (unit: %): ASTM standard D570

[0084] Salt spray resistance (unit: h): ASTM standard B117

[0085] Salt water (6% NaCl) immersion (hours): ASTM standard D870

[0086] Soaking in alkali solution (40% NaOH) (hours): ASTM standard D870

[0087] Acid (30% sulfuric acid) immersion (hours): ASTM standard D870

[0088] The test results are shown in Table 1.

[0089] Table 1

[0090]

[0091] As can be seen from the results in Table 1, the high-adhesion super-heavy anti-corrosion coating prepared by the present invention has an adhesion (dry surface) of up to 42 MPa; it also has excellent mechanical properties, wear resistance, impact resistance, acid and alkali resistance, salt spray resistance and salt water resistance.

[0092] Comparative Example 1 does not include polyarylethernitrile, and epoxy resin is directly used to prepare the anti-corrosion coating. Epoxy resin has certain adhesion on dry surfaces, but it easily peels off on wet or complex surfaces, and the long-term stability of the coating is poor. Epoxy resin is also relatively brittle and has poor impact resistance, making it prone to cracking or falling off when subjected to external force or impact. Epoxy resin is also relatively brittle and has poor impact resistance, making it prone to cracking or falling off when subjected to external force or impact. Under conditions of large temperature changes, epoxy resin coatings are prone to thermal expansion and contraction, causing the coating to crack or peel.

[0093] Directly adopt polyarylether nitrile in comparative example 2, do not introduce containing carboxylic acid side group, can be seen from table 1 data, compared to the anticorrosive coating in comparative example 1, overall performance has significantly improved, polyarylether nitrile has excellent mechanical strength, toughness and heat resistance, can effectively improve the brittle problem of epoxy resin coating, effectively prevent epoxy coating from cracking failure caused by stress concentration metal corrosion phenomenon. Polyarylether nitrile has higher anti-permeability and hydrophobicity, which makes it can be used as an effective physical barrier, prevents moisture and corrosive medium (such as water, oxygen, chloride ion etc.) from penetrating into coating interior and metal surface. Compared to epoxy resin, the water absorption of polyarylether nitrile is low, which means that under humid or high humidity environment, it can better maintain the integrity of coating, avoids the absorption and diffusion of moisture. Although epoxy resin itself has good anticorrosive performance, it may cause coating deterioration because of water absorption and penetration when it is exposed to corrosive environments such as moisture, salt spray for a long time. By adding polyarylether nitrile, the anti-permeability of epoxy resin can be improved, further delay the diffusion of corrosive medium, effectively extend the corrosion protection cycle of coating.

[0094] Although modified poly(arylene ether nitrile) was used in Comparative Example 3, the molar ratio of bisphenol A to phenolphthalein in the modified poly(arylene ether nitrile) was adjusted, and the amount of carboxyl side groups introduced was increased. Introducing carboxyl groups as side chain groups can increase the polarity of poly(arylene ether nitrile), increasing its potential for application in coatings. Carboxyl groups can chemically bond with various metal surfaces, increasing the adhesion of the coating to the substrate, and may also improve the water resistance and corrosion resistance of the coating. However, excessive carboxyl groups easily react with moisture or other chemicals in the environment, causing the polymer to degrade or age in humid or corrosive environments, affecting the stability of the coating.

[0095] In Comparative Example 4, MoS2@Zn-MOF-derived carbon nanomaterials were not used, and the performance of the coating was significantly reduced compared to that in Example 1. MoS2@Zn-MOF-derived carbon nanomaterials have excellent lubricity and dispersibility, and can effectively improve the interfacial bonding between the coating and the substrate. MoS2@Zn-MOF-derived carbon nanomaterials have strong hydrophobic properties and shielding effects, which can reduce the absorption of water by the coating. MoS2@Zn-MOF-derived carbon nanomaterials have excellent corrosion resistance, can block the penetration of corrosive media, and improve the durability of the coating in acids, alkalis, salt spray, and various solvents.

[0096] In Comparative Example 5, MoS2@Zn-MOF nanomaterials were used, but Zn-MOF was not carbonized, which resulted in problems with the long-term stability of Zn-MOF in a corrosive environment. However, the carbonized Zn-MOF was able to form a stable skeleton structure. 2+ It also provides additional protection for corrosion inhibition. Combining the corrosion resistance and lubricity of MoS2, the composite structure of MoS2@Zn-MOF-derived carbon is more stable in the coating.

[0097] Finally, it should be noted that the above-described embodiments merely represent several implementation methods of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made by a person skilled in the art without departing from the spirit of the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention should be based on the appended claims.

Claims

1. A high-adhesion, super-heavy anti-corrosion coating, characterized in that: It consists of two parts, component A and component B, wherein component A includes the following raw materials in parts by weight: 40-60 parts of epoxy resin, 5-10 parts of modified polyarylethernitrile, 1-15 parts of diluent, 1-10 parts of functional filler, 1-15 parts of pigment, and 0.1-3 parts of additives; Component B includes the following raw materials in parts by weight: 5-25 parts of polyamide epoxy curing agent, 5-25 parts of phenalkamine epoxy curing agent, and 0.1-3 parts of accelerator; The preparation method of the modified polyarylether nitrile specifically comprises the following steps: adding reactants 2,6-dichlorobenzonitrile, bisphenol A, and phenolphthalein to a reactor equipped with a stirrer, a condensing reflux pipe, and a water separator; continuously adding a catalyst, anhydrous potassium carbonate, a water-carrying agent, toluene, and a solvent, and heating the reactor to 140-150° C. for azeotropic dehydration; subsequently, distilling off the toluene; and continuously heating the reactor to 190° C. for a polymerization stage. As the reaction proceeds, the viscosity of the solution system increases. When the viscosity of the system becomes constant, the reaction is stopped, and the polymer is poured into a mixed solution of dilute hydrochloric acid and ethanol while hot to precipitate a large amount of white polymer solid. The polymer solid is placed in a grinder for pulverization, and then repeatedly boiled with a large amount of hot water for purification. The purified powder is dried to obtain the modified polyarylether nitrile. The functional filler is a MoS2@Zn-MOF derived carbon nanomaterial, and its preparation method comprises the following steps: (1) Preparation of Zn-MOF: Zn(NO3)2·6H2O and 2-MeIM were dissolved in methanol solution respectively, stirred vigorously, and then the methanol solution containing 2-MeIM was slowly dropped into the methanol solution containing Zn(NO3)2·6H2O. The mixture was stirred, allowed to stand, and the white product was collected by centrifugation. The product was washed with methanol several times, and the white solid was dried in a vacuum oven to obtain Zn-MOF. (2) Preparation of Zn-MOF-derived carbon: Grind the white Zn-MOF solid into powder, place it in a tube furnace and calcine it at 800°C under N2 atmosphere to obtain black Zn-MOF-derived carbon; (3) Preparation of MoS2@Zn-MOF derived carbon: Zn-MOF derived carbon was dispersed in deionized water, and Na2MoO4·2H2O and CH4N2S were added and stirred, and ultrasonically dissolved. The obtained solution was transferred to a stainless steel autoclave lined with polytetrafluoroethylene and subjected to solvent thermal reaction at 200°C. After the reaction was completed, the autoclave was naturally cooled to room temperature, the precipitate was collected by centrifugation, washed, and finally dried in a vacuum oven to obtain MoS2@Zn-MOF derived carbon nanomaterials.

2. The high-adhesion, super-heavy anti-corrosion coating according to claim 1, characterized in that: The epoxy resin is at least one of bisphenol A epoxy resin, bisphenol F epoxy resin and novolac epoxy resin.

3. The high-adhesion, super-heavy anti-corrosion coating according to claim 1, characterized in that: The molar ratio of 2,6-dichlorobenzonitrile, bisphenol A and phenolphthalein is 1:(0.6-0.8):(0.2-0.4).

4. The high-adhesion, super-heavy anti-corrosion coating according to claim 1, characterized in that: The diluent is ethylene glycol diglycidyl ether.

5. The high-adhesion, super-heavy anti-corrosion coating according to claim 1, characterized in that: The pigment is at least one of titanium dioxide, iron black powder, iron red powder, natural barium sulfate, precipitated barium sulfate, talcum powder, silicon dioxide ion exchange type anti-rust pigment and bentonite.

6. The high-adhesion, super-heavy anti-corrosion coating according to claim 1, characterized in that: The additives include dispersants, defoamers, leveling agents and coupling agents, wherein the dispersant is an acrylic dispersant; the defoamer is an organic silicon defoamer; the leveling agent is an acrylic leveling agent; and the coupling agent is a silane coupling agent.

7. The high-adhesion, super-heavy anti-corrosion coating according to claim 1, characterized in that: The curing accelerator is 2,4,6-tris(dimethylaminomethyl)phenol.

8. The high-adhesion, super-heavy anti-corrosion coating according to claim 1, characterized in that: The weight ratio of component A to component B is 2-10:1.

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