High-temperature-resistant hydrophobic anticorrosive coating, preparation method and application thereof

Abstract

The present application belongs to the technical field of anticorrosive coating, and particularly relates to a high-temperature-resistant and hydrophobic anticorrosive coating as well as a preparation method and application thereof. The high-temperature-resistant and hydrophobic anticorrosive coating provided by the present application comprises the following components by weight: 100-140 parts of epoxy resin; 3-7 parts of 2-benzothiazole sulfide succinic acid; 2-6 parts of hydrophobically modified ZIF-67@MgAlCeFe-LDH; 4-8 parts of filler; 2-6 parts of dispersing agent; 1-3 parts of defoaming agent; 2-4 parts of film aid; 15-35 parts of curing agent; 20-30 parts of water; and 10-20 parts of ethanol. The hydrophobically modified ZIF-67@MgAlCeFe-LDH can improve the hydrophobic property of the coating, and in combination with the 2-benzothiazole sulfide succinic acid, the anticorrosive coating is significantly improved in corrosion resistance by virtue of the interaction between the two. That is, the anticorrosive coating prepared by the present application has excellent corrosion resistance, hydrophobic property and high-temperature resistance.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of anticorrosive coating. More particularly, it relates to a high-temperature-resistant and hydrophobic anticorrosive coating as well as a preparation method and application thereof. BACKGROUND

[0002] Corrosion of metal materials can cause huge economic losses and many safety hazards. At present, the joint measures of anticorrosive coating and cathodic protection are generally used to protect the corrosion of buried or deep-sea steel pipelines. Epoxy resin coating is composed of base materials such as epoxy resin, curing agent, pigment and filler, solvent and various functional additives. Epoxy resin coating usually has strong corrosion protection performance, good electrical insulation, high strength and good chemical properties such as chemical resistance, oil resistance and alkali resistance. At the same time, epoxy resin coating also has the process advantages of strong adhesion, room temperature operation and excellent physical and mechanical properties. However, the network structure formed by cross-linking and curing will also cause the epoxy resin coating to exhibit certain brittleness on the macro level. In addition, the solvent dissolved in the resin will be released during curing, producing micropore defects on the coating, providing a channel for the corrosion medium to reach the substrate, affecting the corrosion resistance and hardness of the coating.

[0003] CN118995000A discloses a preparation method of fluorinated graphene / epoxy resin composite anticorrosive coating. GO is used as the initial raw material, and HF generated by the complex decomposition reaction of sulfuric acid (H2SO4) and lithium fluoride (LiF) is used as the fluorination reagent. The FG is obtained by fluorination reaction at 180°C for 12h in a hydrothermal environment. The microstructure and morphology of the prepared FG are analyzed by FT-IR and other characterization methods. Then the surface wettability, abrasion resistance, corrosion resistance and water resistance of the fluorinated graphene / epoxy resin composite anticorrosive coating are characterized by static contact angle analysis. After various structure and performance characterization, the FG prepared by this method has hydrophobicity and abrasion resistance, and can be uniformly dispersed in the epoxy resin matrix, effectively enhancing the water absorption resistance, abrasion resistance and corrosion resistance of the epoxy resin coating.

[0004] CN118995011A discloses a high-temperature-resistant super-hydrophobic long-acting anticorrosive coating and a preparation method thereof. The preparation method of the high-temperature-resistant super-hydrophobic long-acting anticorrosive coating comprises the following steps: surface modification of nanoparticles by using γ-methacryloxypropyl trimethoxysilane to obtain modified nanoparticles; surface modification of nanosilica by using vinyl trimethoxysilane to obtain super-hydrophobic silica; polymerization of the modified nanoparticles and the super-hydrophobic silica with methacrylic acid, and then grafting onto a phenolic epoxy resin through ring-opening reaction to obtain a modified epoxy vinyl resin; and mixing the modified epoxy vinyl resin and a curing agent uniformly, and then spraying onto a surface of a metal substrate to obtain the high-temperature-resistant super-hydrophobic long-acting anticorrosive coating after curing. The present application not only improves the crosslinking degree, heat resistance, shielding property and toughness of the epoxy vinyl resin, but also improves the hydrophobicity of the coating, so that the coating has long-acting anticorrosive property.

[0005] CN118852947A discloses a preparation method of a super-hydrophobic anticorrosive coating with double dynamic covalent bonds. The method comprises the following steps: first, grafting a dynamic disulfide bond on the surface of graphene and carbon nanotubes by using a silane coupling agent, and then mixing with ethanol and a fluorinated modifier to construct modified graphene and carbon nanotubes containing a dynamic disulfide bond; preparing anticorrosive coating component A by mixing epoxy resin stock solution, organic solvent and graphene containing a dynamic disulfide bond; preparing anticorrosive coating component B by adding modified carbon nanotubes to a curing agent containing a dynamic ester bond; and finally, mixing anticorrosive coating component A and anticorrosive coating component B to prepare a super-hydrophobic anti-icing coating with self-repairing function. The present application constructs a dynamic disulfide bond on the surface of graphene and carbon nanotubes, and uses a curing agent containing a dynamic ester bond to cure the coating to prepare a super-hydrophobic anticorrosive coating with excellent self-repairing and recyclable properties.

[0006] CN118165613A discloses a hydrophobic modified anticorrosive coating and a preparation method thereof. The method for preparing the hydrophobic modified anticorrosive coating comprises the following steps: soaking the anticorrosive coating in a PDMS homogeneous solution, standing, curing, and obtaining the hydrophobic modified anticorrosive coating. The preparation of the anticorrosive coating comprises the following steps: coating, drying, and curing to obtain the anticorrosive coating. The preparation method of the coating comprises the following steps: etching g-C3N4 in an acidic solution, ultrasonicating to obtain etched g-C3N4; mixing the etched g-C3N4, aniline and water, adjusting the pH to obtain a polyaniline precursor solution with a pH of 1-4, performing photopolymerization reaction on the polyaniline precursor solution to obtain a second precipitate, washing, freeze-drying to obtain a polyaniline composite nanomaterial; dispersing the polyaniline composite nanomaterial in a water-based epoxy resin, stirring first and then ultrasonicating to obtain a first solution, and mixing the first solution and a curing agent uniformly to obtain the coating. The hydrophobic modified anticorrosive coating has the advantages of anticorrosion, ultraviolet resistance, algae resistance, high hydrophobicity and long service life.

[0007] Hydrophobic materials can also achieve hydrophobic performance by adding hydrophobic aids in the paint or spraying on the surface of the coating, thereby blocking moisture erosion and avoiding metal corrosion. Based on this, the application provides an anti-corrosion coating with excellent hydrophobic and corrosion-resistant properties. SUMMARY

[0008] The technical problem to be solved by the application is to overcome the defects and deficiencies of the prior art and provide a high-temperature-resistant hydrophobic anti-corrosion coating, a preparation method and application thereof. The high-temperature-resistant hydrophobic anti-corrosion coating provided by the application comprises the following components in parts by weight: epoxy resin 100-140 parts; 2-benzothiazole thiosuccinic acid 3-7 parts; hydrophobically modified ZIF-67@MgAlCeFe-LDH 2-6 parts; filler 4-8 parts; dispersant 2-6 parts; defoaming agent 1-3 parts; film aid 2-4 parts; curing agent 15-35 parts; water 20-30 parts; and ethanol 10-20 parts. The addition of hydrophobically modified ZIF-67@MgAlCeFe-LDH can improve the hydrophobic performance of the coating, and the use of 2-benzothiazole thiosuccinic acid and the interaction between the two can significantly improve the corrosion resistance of the anti-corrosion coating. That is, the anti-corrosion coating prepared by the application has excellent corrosion resistance, hydrophobic performance and high-temperature resistance.

[0009] The purpose of the application is to provide a high-temperature-resistant hydrophobic anti-corrosion coating.

[0010] Another purpose of the application is to provide a preparation method of a high-temperature-resistant hydrophobic anti-corrosion coating.

[0011] Another purpose of the application is to provide a high-temperature-resistant hydrophobic anti-corrosion coating for use in the field of corrosion prevention.

[0012] The above purposes of the application are achieved by the following technical solutions.

[0013] A high-temperature-resistant hydrophobic anti-corrosion coating, comprising the following components in parts by weight:

[0014] Epoxy resin 100-140 parts;

[0015] 2-benzothiazole thiosuccinic acid 3-7 parts;

[0016] Hydrophobically modified ZIF-67@MgAlCeFe-LDH 2-6 parts;

[0017] Filler 4-8 parts;

[0018] Dispersant 2-6 parts;

[0019] Defoaming agent 1-3 parts;

[0020] Film aid 2-4 parts;

[0021] Curing agent 15-35 parts;

[0022] Water 20-30 parts;

[0023] Ethanol 10-20 parts.

[0024] In the present application, the preferred technical solution, the preparation method of the hydrophobically modified ZIF-67@MgAlCeFe-LDH comprises the following steps:

[0025] (1) Weigh the magnesium salt, cerium salt, iron salt and aluminum salt, dissolve them in water to prepare a mixed salt solution, stir, then add alkali solution to the solution until the pH is 9-11, then transfer to a hydrothermal reaction kettle for hydrothermal reaction, centrifuge, wash and dry to obtain MgAlCeFe-LDH;

[0026] (2) Disperse the MgAlCeFe-LDH obtained in step (1) and cobalt salt into ethanol water, stir, then add dimethyl imidazole, stir at 50-70°C for 2-4h, stand for 4-8h, filter, wash and dry to obtain ZIF-67@MgAlCeFe-LDH;

[0027] (3) Ultrasonically disperse the ZIF-67@MgAlCeFe-LDH obtained in step (2) and fluorodecyl triethoxysilane into ethanol, stir at 55-75°C for 2-4h, filter, wash and dry to obtain the hydrophobically modified ZIF-67@MgAlCeFe-LDH.

[0028] Further, in step (1), the magnesium salt is at least one of magnesium nitrate, magnesium acetate and magnesium chloride; the cerium salt is at least one of cerium nitrate, cerium acetate and cerium chloride; the iron salt is at least one of ferric nitrate, ferric acetate and ferric chloride; the aluminum salt is at least one of aluminum nitrate, aluminum chloride and aluminum acetate; the molar ratio of the magnesium salt, cerium salt, iron salt and aluminum salt is 1:0.05-0.15:0.1-0.3:2-4.

[0029] Further, in step (1), the stirring time is 20-40min, the alkali solution has a concentration of 1-3mol / L, the alkali is sodium hydroxide and sodium carbonate, and the molar ratio of sodium hydroxide to sodium carbonate is 1:3.

[0030] Further, in step (1), the hydrothermal reaction conditions are 130-170°C for 6-14h; the drying is at 70-100°C for 8-12h.

[0031] Further, in step (2), the volume ratio of the ethanol to water is 1:3; the ratio of the MgAlCeFe-LDH, the cobalt salt and the dimethyl imidazole is 10 g:0.04-0.08 mol:0.09-0.19 mol; the cobalt salt is at least one of cobalt nitrate, cobalt chloride and cobalt acetate.

[0032] Further, in step (2), the stirring time is 20-40 min; the drying is at 70-90℃ for 10-20 h.

[0033] Further, in step (3), the mass ratio of the ZIF-67@MgAlCeFe-LDH and the fluorodecyl triethoxysilane is 1:0.1-0.3, and the drying is at 70-90℃ for 10-20 h.

[0034] Based on the above-mentioned preparation method of the high-temperature-resistant hydrophobic anticorrosive coating, the preparation method comprises the following steps: first, 2-benzothiazole thiosuccinic acid, hydrophobically modified ZIF-67@MgAlCeFe-LDH, water and ethanol are put into a high-speed blender to mix, the stirring rate is 3000-4000 r / min, and the stirring time is 20-60 min; then, epoxy resin, filler, dispersant, defoaming agent, film aid and curing agent are added to the mixture to continue stirring for 15-35 min, so as to obtain the coating; then, the prepared coating is coated on a base material, and the base material is placed at room temperature for 24-30 h, and then cured at room temperature for 20-28 h, so as to obtain the high-temperature-resistant hydrophobic anticorrosive coating.

[0035] Based on the above-mentioned preparation method of the high-temperature-resistant hydrophobic anticorrosive coating, the preparation method comprises the following steps: first, 2-benzothiazole thiosuccinic acid, hydrophobically modified ZIF-67@MgAlCeFe-LDH, water and ethanol are put into a high-speed blender to mix, the stirring rate is 3000-4000 r / min, and the stirring time is 20-60 min; then, epoxy resin, filler, dispersant, defoaming agent, film aid and curing agent are added to the mixture to continue stirring for 15-35 min, so as to obtain the coating; then, the prepared coating is coated on a base material, and the base material is placed at room temperature for 24-30 h, and then cured at room temperature for 20-28 h, so as to obtain the high-temperature-resistant hydrophobic anticorrosive coating.

[0036] The application has the following beneficial effects:

[0037] The application can significantly improve the corrosion resistance of the coating by modifying the MgAl-LDH hydrotalcite with Ce and Fe and in-situ loading ZIF-67, and further improve the corrosion resistance of the coating by 2-benzothiazole thiosuccinic acid, and the hydrotalcite and ZIF-67 can significantly improve the high-temperature resistance, and the hydrophobically modified ZIF-67@MgAlCeFe-LDH can improve the hydrophobic property of the coating. Therefore, the high-temperature-resistant hydrophobic anticorrosive coating prepared by the application has excellent performance and good application prospect in the anticorrosion field. DETAILED DESCRIPTION

[0038] The application will be further described below in combination with specific examples, but the examples do not limit the application in any form. Unless otherwise specified, the reagents, methods and devices used in the application are conventional reagents, methods and devices in the technical field.

[0039] The filler is nano-titanium dioxide with an average particle size of 50 nm; the dispersant is BYK163; the defoaming agent is BYK065; the film aid is propylene glycol propyl ether; and the curing agent is diethylene triamine.

[0040] Unless otherwise specified, the reagents and materials used in the following examples are commercially available.

[0041] Example 1

[0042] A high-temperature-resistant hydrophobic anticorrosive coating, the raw materials of the coating include the following components by weight:

[0043] Epoxy resin E44 120 parts;

[0044] 2-benzothiazole thiosuccinic acid 5 parts;

[0045] Hydrophobically modified ZIF-67@MgAlCeFe-LDH 4 parts;

[0046] Filler 6 parts;

[0047] Dispersant 4 parts;

[0048] Defoaming agent 2 parts;

[0049] Film aid 3 parts;

[0050] Curing agent 25 parts;

[0051] Water 25 parts;

[0052] Ethanol 15 parts.

[0053] The preparation method of the hydrophobically modified ZIF-67@MgAlCeFe-LDH includes the following steps:

[0054] (1) Weigh 1 mol of magnesium nitrate, 0.1 mol of cerium acetate, 0.2 mol of iron chloride and 3 mol of aluminum nitrate and dissolve them in 150 mL of water to prepare a mixed salt solution, stir for 30 min, then add alkali liquid to the solution until the pH is 10, the concentration of the alkali liquid is 2 mol / L, the alkali is sodium hydroxide and sodium carbonate, and the molar ratio of sodium hydroxide to sodium carbonate is 1:3, then transfer to a hydrothermal reaction kettle, react at 150℃ for 12h, centrifuge, wash, and dry at 90℃ for 10h to obtain MgAlCeFe-LDH;

[0055] (2) Disperse 10g of MgAlCeFe-LDH obtained in step (1) and 0.06mol of cobalt nitrate into 150mL of ethanol water, the volume ratio of ethanol to water is 1:3, stir for 30min, then add 0.14mol of dimethyl imidazole, stir at 60℃ for 3h, stand for 6h, filter, wash, and dry at 80℃ for 16h to obtain ZIF-67@MgAlCeFe-LDH;

[0056] (3) 10 g of ZIF-67@MgAlCeFe-LDH obtained in step (2) and 2 g of fluorodecyltriethoxysilane were ultrasonically dispersed into 150 mL of ethanol, stirred at 65°C for 3 h, filtered, washed, and dried at 80°C for 16 h to obtain hydrophobically modified ZIF-67@MgAlCeFe-LDH.

[0057] The preparation method of the high-temperature-resistant hydrophobic anticorrosive coating comprises the following steps: first, 2-benzothiazole thiosuccinic acid, hydrophobically modified ZIF-67@MgAlCeFe-LDH, water and ethanol are placed in a high-speed blender and mixed at a stirring rate of 3500 r / min for 40 min; then, epoxy resin, filler, dispersant, defoaming agent, film aid and curing agent are added to the above mixture and continue to stir for 25 min to obtain a coating; then, the prepared coating is coated on steel with a coating thickness of 4 mm, and is left to stand at room temperature for 26 h, and then cured at room temperature for 24 h to obtain a high-temperature-resistant hydrophobic anticorrosive coating.

[0058] Example 2

[0059] A high-temperature-resistant hydrophobic anticorrosive coating, the raw materials of the coating comprise the following components by weight:

[0060] Epoxy resin E44 100 parts;

[0061] 2-benzothiazole thiosuccinic acid 7 parts;

[0062] Hydrophobically modified ZIF-67@MgAlCeFe-LDH 2 parts;

[0063] Filler 8 parts;

[0064] Dispersant 2 parts;

[0065] Defoaming agent 3 parts;

[0066] Film aid 2 parts;

[0067] Curing agent 35 parts;

[0068] Water 20 parts;

[0069] Ethanol 20 parts.

[0070] The preparation method of the hydrophobically modified ZIF-67@MgAlCeFe-LDH comprises the following steps:

[0071] (1) 1 mol of magnesium chloride, 0.05 mol of cerium nitrate, 0.3 mol of iron acetate and 2 mol of aluminum acetate were dissolved in 150 mL of water to prepare a mixed salt solution, stirred for 20 min, and then an alkali solution was added dropwise until the pH of the solution was 9. The alkali solution had a concentration of 1 mol / L, and the alkali was sodium hydroxide and sodium carbonate, with a molar ratio of sodium hydroxide to sodium carbonate of 1:3. Then it was transferred to a hydrothermal reaction kettle and reacted at 130°C for 14 h. After centrifugation, washing and drying at 70°C for 12 h, MgAlCeFe-LDH was obtained.

[0072] (2) 10 g of MgAlCeFe-LDH obtained in step (1) and 0.04 mol of cobalt chloride were dispersed in 150 mL of ethanol water, with a volume ratio of ethanol to water of 1:3, stirred for 20 min, and then 0.09 mol of dimethylimidazole was added. After stirring at 50°C for 4 h, standing for 4 h, filtration, washing and drying at 70°C for 20 h, ZIF-67@MgAlCeFe-LDH was obtained.

[0073] (3) 10 g of ZIF-67@MgAlCeFe-LDH obtained in step (2) and 1 g of fluorodecyl triethoxysilane were ultrasonically dispersed in 150 mL of ethanol, stirred at 55°C for 4 h, filtered, washed and dried at 70°C for 20 h to obtain hydrophobically modified ZIF-67@MgAlCeFe-LDH.

[0074] The preparation method of the high-temperature-resistant hydrophobic anticorrosive coating is the same as that of Example 1.

[0075] Example 3

[0076] A high-temperature-resistant hydrophobic anticorrosive coating, the raw materials of the coating include the following components by weight:

[0077] Epoxy resin E44 140 parts;

[0078] 2-benzothiazole thiosuccinic acid 3 parts;

[0079] Hydrophobically modified ZIF-67@MgAlCeFe-LDH 6 parts;

[0080] Filler 4 parts;

[0081] Dispersant 6 parts;

[0082] Defoamer 1 part;

[0083] Film aid 4 parts;

[0084] Curing agent 15 parts;

[0085] Water 30 parts;

[0086] Ethanol 10 parts.

[0087] The preparation method of the hydrophobically modified ZIF-67@MgAlCeFe-LDH comprises the following steps:

[0088] (1) 1 mol of magnesium acetate, 0.15 mol of cerium chloride, 0.1 mol of iron nitrate, and 4 mol of aluminum chloride were dissolved in 150 mL of water to prepare a mixed salt solution, stirred for 40 min, and then an alkali solution was added dropwise until the pH of the solution was 11, the concentration of the alkali solution was 3 mol / L, the alkali was sodium hydroxide and sodium carbonate, the molar ratio of sodium hydroxide to sodium carbonate was 1:3, and then transferred to a hydrothermal reaction kettle, reacted at 170°C for 6 h, centrifuged, washed, and dried at 100°C for 8 h to obtain MgAlCeFe-LDH;

[0089] (2) 10 g of MgAlCeFe-LDH obtained in step (1) and 0.08 mol of cobalt acetate were dispersed in 150 mL of ethanol water, the volume ratio of ethanol to water was 1:3, stirred for 40 min, then 0.19 mol of dimethylimidazole was added, stirred at 70°C for 2 h, stood for 8 h, filtered, washed, and dried at 90°C for 10 h to obtain ZIF-67@MgAlCeFe-LDH;

[0090] (3) 10 g of ZIF-67@MgAlCeFe-LDH obtained in step (2) and 3 g of fluorodecyltriethoxysilane were ultrasonically dispersed in 150 mL of ethanol, stirred at 75°C for 2 h, filtered, washed, and dried at 90°C for 10 h to obtain hydrophobically modified ZIF-67@MgAlCeFe-LDH.

[0091] The preparation method of the high-temperature-resistant hydrophobic corrosion-resistant coating is the same as that of Example 1.

[0092] Comparative Example 1

[0093] Comparative Example 1 is basically the same as Example 1, except that an equal amount of hydrophobically modified ZIF-67@MgAlFe-LDH is used instead of hydrophobically modified ZIF-67@MgAlCeFe-LDH. The preparation method of the hydrophobically modified ZIF-67@MgAlFe-LDH comprises the following steps:

[0094] (1) 1 mol of magnesium acetate, 0.15 mol of cerium chloride, 0.1 mol of iron nitrate, and 4 mol of aluminum chloride were dissolved in 150 mL of water to prepare a mixed salt solution, stirred for 40 min, and then an alkali solution was added dropwise until the pH of the solution was 11, the concentration of the alkali solution was 3 mol / L, the alkali was sodium hydroxide and sodium carbonate, the molar ratio of sodium hydroxide to sodium carbonate was 1:3, and then transferred to a hydrothermal reaction kettle, reacted at 170°C for 6 h, centrifuged, washed, and dried at 100°C for 8 h to obtain MgAlCeFe-LDH;

[0095] (2) 10 g of MgAlFe-LDH obtained in step (1) and 0.06 mol of cobalt nitrate were dispersed in 150 mL of ethanol water with a volume ratio of ethanol to water of 1:3, stirred for 30 min, then 0.14 mol of dimethylimidazole was added, stirred at 60°C for 3 h, left to stand for 6 h, filtered, washed, and dried at 80°C for 16 h to obtain ZIF-67@MgAlFe-LDH;

[0096] (3) 10 g of ZIF-67@MgAlFe-LDH obtained in step (2) and 2 g of fluorodecyltriethoxysilane were ultrasonically dispersed in 150 mL of ethanol, stirred at 65°C for 3 h, filtered, washed, and dried at 80°C for 16 h to obtain hydrophobically modified ZIF-67@MgAlFe-LDH.

[0097] Comparative Example 2

[0098] Comparative Example 2 is basically the same as Example 1, except that an equal amount of hydrophobically modified MgAlCeFe-LDH is used instead of hydrophobically modified ZIF-67@MgAlCeFe-LDH. The preparation method of the hydrophobically modified MgAlCeFe-LDH comprises the following steps:

[0099] (1) 1 mol of magnesium nitrate, 0.1 mol of cerium acetate, 0.2 mol of iron chloride, and 3 mol of aluminum nitrate were dissolved in 150 mL of water to prepare a mixed salt solution, stirred for 30 min, then a lye was added dropwise until the pH of the solution was 10, the lye was a lye with a concentration of 2 mol / L, the lye was sodium hydroxide and sodium carbonate, the molar ratio of sodium hydroxide to sodium carbonate was 1:3, then transferred to a hydrothermal reaction kettle, reacted at 150°C for 12 h, centrifuged, washed, and dried at 90°C for 10 h to obtain MgAlCeFe-LDH;

[0100] (2) 10 g of MgAlCeFe-LDH obtained in step (1) and 2 g of fluorodecyltriethoxysilane were ultrasonically dispersed in 150 mL of ethanol, stirred at 65°C for 3 h, filtered, washed, and dried at 80°C for 16 h to obtain hydrophobically modified MgAlCeFe-LDH.

[0101] Comparative Example 3

[0102] Comparative Example 3 is basically the same as Example 1, except that an equal amount of hydrophobically modified ZIF-67 is used instead of hydrophobically modified ZIF-67@MgAlCeFe-LDH. The preparation method of the hydrophobically modified ZIF-67 comprises the following steps:

[0103] The preparation method of the hydrophobically modified ZIF-67 comprises the following steps:

[0104] (2) 0.06 mol of cobalt nitrate was dispersed into 150 mL of ethanol water with a volume ratio of ethanol to water of 1:3, stirred for 30 min, then 0.14 mol of dimethylimidazole was added, stirred at 60°C for 3 h, rested for 6 h, filtered, washed, and dried at 80°C for 16 h to obtain ZIF-67;

[0105] (2) 10 g of ZIF-67 obtained in step (1) and 2 g of fluorodecyltriethoxysilane were ultrasonically dispersed into 150 mL of ethanol, stirred at 65°C for 3 h, filtered, washed, and dried at 80°C for 16 h to obtain hydrophobically modified ZIF-67.

[0106] Comparative Example 4

[0107] Comparative Example 4 is basically the same as Example 1, except that an equal amount of 2-benzothiazole sulfide succinic acid is used instead of hydrophobically modified ZIF-67@MgAlCeFe-LDH.

[0108] The water contact angles of the coatings prepared in Examples 1-3 were tested, and the specific test results are shown in Table 1:

[0109] Table 1

[0110] Example 1 Example 2 Example 3 Water contact angle 125° 121° 124°

[0111] The mechanical properties and corrosion resistance of Examples 1-3 and Comparative Examples 1-4 were tested, and the specific test results are shown in Table 2: wherein the test standards are as follows:

[0112] Adhesion (tensile adhesion): GB / T5210;

[0113] Corrosion resistance: GB / T 9274-88 and GB / T 1771-91.

[0114]

[0115] As can be seen from Table 2, the corrosion-resistant coating prepared by the present application has excellent mechanical properties and corrosion resistance.

[0116] The dry heat resistance of the corrosion-resistant coatings of Examples 1-3 was tested according to test method ASTM D 5499 method A, and Examples 1-3 had no defects at 200°C. That is, it can be seen that the corrosion-resistant coating prepared by the present application has high temperature resistance.

[0117] The above examples are preferred embodiments of the present application, but the embodiments of the present application are not limited by the above examples, and any changes, modifications, substitutions, combinations, simplifications made without departing from the spirit and principles of the present application are equivalent replacement methods and are included in the protection scope of the present application.

Claims

1. A high-temperature resistant, hydrophobic, and corrosion-resistant coating, characterized in that: The raw material for the coating, by weight, comprises the following components: 100-140 parts epoxy resin; 3-7 parts of 2-benzothiazole thiosuccinic acid; 2-6 parts of hydrophobically modified ZIF-67@MgAlCeFe-LDH; 4-8 parts of filler; 2-6 parts dispersant; 1-3 parts of defoamer; 2-4 parts of membrane additive; 15-35 parts of curing agent; 20-30 parts water; 10-20 parts ethanol; The preparation method of the hydrophobically modified ZIF-67@MgAlCeFe-LDH includes the following steps: (1) Weigh magnesium salt, cerium salt, iron salt and aluminum salt and dissolve them in water to prepare a mixed salt solution. Stir and then add alkali solution dropwise until the pH of the solution is 9~11. Then transfer it to a hydrothermal reactor for hydrothermal reaction, centrifuge, wash and dry to obtain MgAlCeFe-LDH. (2) Disperse the MgAlCeFe-LDH and cobalt salt obtained in step (1) into ethanol-water, stir, then add dimethylimidazole, stir at 50~70℃ for 2~4h, let stand for 4~8h, filter, wash, and dry to obtain ZIF-67@MgAlCeFe-LDH; the volume ratio of ethanol to water is 1:3; the ratio of MgAlCeFe-LDH, cobalt salt and dimethylimidazole is 10g:0.04~0.08mol:0.09~0.19mol; the cobalt salt is at least one of cobalt nitrate, cobalt chloride and cobalt acetate; (3) The ZIF-67@MgAlCeFe-LDH and fluorodecyltriethoxysilane obtained in step (2) are ultrasonically dispersed in ethanol, stirred at 55~75℃ for 2~4h, filtered, washed and dried to obtain hydrophobically modified ZIF-67@MgAlCeFe-LDH; the mass ratio of ZIF-67@MgAlCeFe-LDH and fluorodecyltriethoxysilane is 1:0.1~0.3, and the drying is carried out at 70~90℃ for 10~20h.

2. The high-temperature resistant, hydrophobic, and corrosion-resistant coating according to claim 1, characterized in that: In step (1), the magnesium salt is at least one of magnesium nitrate, magnesium acetate, and magnesium chloride; the cerium salt is at least one of cerium nitrate, cerium acetate, and cerium chloride; the iron salt is at least one of ferric nitrate, ferric acetate, and ferric chloride; the aluminum salt is at least one of aluminum nitrate, aluminum chloride, and aluminum acetate; and the molar ratio of the magnesium salt, cerium salt, iron salt, and aluminum salt is 1:0.05~0.15:0.1~0.3:2-4.

3. The high-temperature resistant, hydrophobic, and corrosion-resistant coating according to claim 1, characterized in that: In step (1), the stirring time is 20-40 min, the alkali solution has a concentration of 1-3 mol / L, the alkali is sodium hydroxide and sodium carbonate, and the molar ratio of sodium hydroxide to sodium carbonate is 1:

3.

4. The high-temperature resistant, hydrophobic, and corrosion-resistant coating according to claim 1, characterized in that: In step (1), the hydrothermal reaction conditions are 130~170℃ for 6~14h; the drying is 70~100℃ for 8~12h.

5. The high-temperature resistant, hydrophobic, and corrosion-resistant coating according to claim 1, characterized in that: In step (2), the stirring time is 20~40 min; the drying is carried out at 70~90℃ for 10~20 h.

6. The method for preparing a high-temperature resistant hydrophobic anti-corrosion coating according to any one of claims 1-5, characterized in that: The preparation method includes the following steps: First, 2-benzothiazole thiosuccinic acid, hydrophobically modified ZIF-67@MgAlCeFe-LDH, water, and ethanol are mixed in a high-speed mixer to obtain a mixture. The mixing speed is 3000~4000 r / min, and the mixture is stirred for 20~60 min. Then, epoxy resin, filler, dispersant, defoamer, film additive, and curing agent are added to the above mixture and the mixture is stirred for 15~35 min to obtain a coating. The prepared coating is then coated on a substrate material, allowed to stand at room temperature for 24~30 h, and then cured at room temperature for 20~28 h. After curing, a high-temperature resistant, hydrophobic, and anti-corrosion coating is obtained.

7. The application of the high-temperature resistant hydrophobic anti-corrosion coating according to any one of claims 1-5 in the field of corrosion protection.

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