Anticorrosive coating for oil storage tank and preparation method thereof

Abstract

The present application relates to the technical field of epoxy anticorrosive paint, in particular to an anticorrosive paint for oil storage depot and a preparation method thereof, which is cured after being coated by two-component compounding, and the obtained anticorrosive coating has excellent adhesion, hydrophobicity, oil repellency, heat resistance and chemical corrosion resistance, and is particularly suitable for the anticorrosion of oil storage depot. In the A component, bisphenol A type epoxy resin is used as the main material, and modified epoxy resin prepolymer, active diluent, nano zinc silicate, coupling agent, dispersant and defoaming agent are added to synergistically improve the overall adhesion, hydrophobicity, oil repellency, heat resistance and chemical corrosion resistance. The amine curing agent and curing accelerator jointly act to promote the curing of the system, shorten the curing time, and reduce the curing temperature to 25 DEG C for 8-10h or 70 DEG C for 2-3h to achieve complete curing, thereby avoiding the adverse effects of high-temperature curing on the oil storage depot.

Description

Technical Field

[0001] This invention relates to the field of epoxy anti-corrosion coating technology, specifically to an anti-corrosion coating for an oil storage tank and its preparation method. Background Technology

[0002] The e-liquid reservoir in e-cigarettes is typically made of plastics such as PCTG. The main components of e-liquid include propylene glycol (PG), vegetable glycerin (VG), nicotine, and flavorings. Due to the insufficient thermal stability and chemical resistance of the plastic material in the reservoir, e-liquid components easily seep into or adhere to it. Furthermore, the reservoir is heated during e-cigarette use, which can lead to corrosion over time and allow the plastic to leach into the e-liquid, potentially affecting the user's health. Summary of the Invention

[0003] In order to overcome the shortcomings and deficiencies of the existing technology, one of the objectives of this invention is to provide an anti-corrosion coating for oil storage tanks.

[0004] The second objective of this invention is to provide a method for preparing an anti-corrosion coating for oil storage tanks. This method is simple to operate, easy to control, has high production efficiency, low production cost, and can be used for large-scale production.

[0005] One of the objectives of this invention is achieved through the following technical solution: an anti-corrosion coating for an oil storage tank, composed of component A and component B in a weight ratio of 6-10:1;

[0006] Component A comprises the following raw materials in parts by weight:

[0007]

[0008] Component B comprises the following raw materials in parts by weight:

[0009] 45-85 parts of amine curing agent

[0010] 1-12 parts of curing accelerator.

[0011] The anti-corrosion coating for this oil storage tank is a two-component compound coating that is applied and cured. The resulting anti-corrosion coating exhibits excellent adhesion, hydrophobicity, oleophobicity, heat resistance, and chemical corrosion resistance, making it particularly suitable for the corrosion protection of oil storage tanks. Component A is based on bisphenol A type epoxy resin, with the addition of modified epoxy resin prepolymer, reactive diluent, nano-zinc silicate, coupling agent, dispersant, and defoamer for synergistic effect, improving overall adhesion, hydrophobicity, oleophobicity, heat resistance, and chemical corrosion resistance. The added bisphenol A type epoxy resin, modified epoxy resin prepolymer, and reactive diluent cross-link and cure under the action of component B, forming a network structure. Furthermore, the special modified structure of the modified epoxy resin prepolymer promotes the coating's adhesion, chemical resistance, weather resistance, and stain resistance, resulting in excellent performance. Its oleophobic properties allow it to form a protective film on the coating surface, resisting the erosion of strong acids, strong alkalis, and organic solvents, and preventing the penetration and adhesion of grease. In addition, with the addition of coupling agents, dispersants, and nano zinc silicate, the nano zinc silicate is evenly dispersed in the coating and forms a protective layer on the coating surface, isolating harmful factors such as grease and ultraviolet rays, protecting the substrate from external environmental erosion and damage, improving the overall corrosion resistance, enhancing coating adhesion, increasing hardness and heat resistance, preventing coating cracking and peeling, and improving coating durability.

[0012] Preferably, the bisphenol A type epoxy resin is E-44 or E-51.

[0013] Preferably, the preparation method of each part of the modified epoxy resin prepolymer includes the following steps:

[0014] (R1) Take 30-60 parts by weight of fluoroalcohol vinyl ether, 15-30 parts of N,N-dimethyl-N'-β-(aminoethyl)-γ-aminopropyltriethoxysilane, 15-25 parts of methanol, 20-30 parts of triethylamine, 1-2 parts of dibutyltin dilaurate catalyst and 50-80 parts of bisphenol A diglycidyl ether, and set aside.

[0015] (R2) After mixing methanol and triethylamine evenly, add fluoroethanol vinyl ether and mix, then heat to 45-50℃ and keep warm for 5-6 hours. After washing with water and allowing to stand for separation, take the lower layer to obtain the pre-reaction solution.

[0016] (R3) The pre-reaction solution was mixed with N,N-dimethyl-N'-β-(aminoethyl)-γ-aminopropyltriethoxysilane and heated to 60°C for 4 hours to obtain fluorinated siloxane.

[0017] (R4) Add dibutyltin dilaurate catalyst and bisphenol A diglycidyl ether to fluorinated modified siloxane, stir and heat to 80°C for 2 hours under nitrogen protection to obtain modified epoxy resin prepolymer.

[0018] Using the above technical solution, the preparation method of modified epoxy resin prepolymer involves pre-reacting fluoroethanol vinyl ether as the main material, followed by mixing and reacting it with N,N-dimethyl-N'-β-(aminoethyl)-γ-aminopropyltriethoxysilane to obtain a reactive fluorinated siloxane. Then, under the protection of a catalyst and nitrogen, it is polymerized with bisphenol A diglycidyl ether. The resulting modified epoxy resin prepolymer has a special modified structure, which promotes its chemical resistance, weather resistance, and stain resistance. It also has good oleophobic properties and can form a protective film on the coating surface, resisting the erosion of strong acids, strong alkalis, and organic solvents, and preventing the penetration and adhesion of soot.

[0019] Preferably, the active diluent is at least one of alkylene glycidyl ether, dodecyl glycidyl ether, or 1,4-butanediol diglycidyl ether.

[0020] The above technical solution is beneficial for diluting and reducing the viscosity of the resin system and improving wettability. It can also accelerate the cross-linking reaction of the system with amine curing agents, shorten the gel curing time, and reduce the curing temperature of the system to 8-10 hours at 25℃ or 2-3 hours at 70℃ to achieve complete curing.

[0021] Preferably, the particle size of the nano zinc silicate is 40nm-130nm.

[0022] By adopting the above technical solution, a protective layer is formed on the coating surface using nano zinc silicate, which isolates harmful factors such as oil fumes and ultraviolet rays, protects the substrate from external environmental erosion and damage, improves the overall corrosion resistance, enhances coating adhesion, increases hardness and heat resistance, prevents coating cracking and peeling, and improves coating durability.

[0023] Preferably, the coupling agent is a mixture of fluorinated coupling agent YS-1701 and silane coupling agent KH560 in a weight ratio of 0.01-0.02:1; the dispersant is BYK-AT204.

[0024] Using the above technical solution, the coupling agent is a combination of fluorinated coupling agent YS-1701 and silane coupling agent KH560, which can significantly enhance interfacial compatibility, reduce interfacial tension, and improve the adhesion of nano-zinc silicate in the system. If only silane coupling agent KH560 or fluorinated coupling agent YS-1701 is used, the improvement effect is not obvious, and the use of fluorinated coupling agent YS-1701 alone is costly and requires a large amount, which is not conducive to saving production costs. The coupling agent and dispersant work together to promote the uniform dispersion and bonding of nano-zinc silicate in the system, improve interfacial compatibility and adhesion, and promote the effective performance of nano-zinc silicate in the coating.

[0025] Preferably, the defoamer is at least one of polyether defoamer PE6200, silicone polyether defoamer F-521, or polyether defoamer DF-103T.

[0026] The above technical solution helps to remove air bubbles in the system and avoids affecting the overall performance and appearance quality of the coating.

[0027] Preferably, the amine curing agent is a mixture of polyetheramine D-230 and polyamide curing agent 125 in a weight ratio of 3-5:1.

[0028] Using the above technical solution, the amine curing agent uses a synergistic combination of polyetheramine D-230 and polyamide curing agent 125 to improve the adhesion of the system, increase the speed and degree of curing reaction, and thus obtain a coating with better adhesion.

[0029] Preferably, the curing accelerator is 2,4,6-tris(dimethylaminomethyl)phenol and / or triethylamine.

[0030] Using the above technical solution, amine curing agents and curing accelerators work together to promote system curing, shorten curing time, and reduce the curing temperature of the system to achieve complete curing in 8-10 hours at 25℃ or 2-3 hours at 70℃, thus avoiding the adverse effects of high-temperature curing on the oil storage tank.

[0031] The second objective of this invention is achieved through the following technical solution: the preparation method of the anti-corrosion coating for the oil storage tank described above includes the following steps:

[0032] (S1) Preparation of component A: Take bisphenol A type epoxy resin, modified epoxy resin prepolymer, reactive diluent, nano zinc silicate, dispersant, coupling agent and defoamer according to the weight parts, stir at 50-60℃ for 1-2h, and encapsulate to obtain component A.

[0033] (S2) Preparation of component B: Take amine curing agent and curing accelerator according to the weight parts, stir at room temperature for 30-60 min, and encapsulate to obtain component B;

[0034] When using, mix component A and component B evenly at a weight ratio of 6-10:1 to obtain the anti-corrosion coating for the oil storage tank.

[0035] The preparation method of the anti-corrosion coating for the oil storage tank is simple to operate and easy to control. In step (S1), stirring and mixing at 50-60℃ further promotes the uniform dispersion and bonding of nano zinc silicate in the system, improves interfacial compatibility and adhesion, and promotes the effective function of nano zinc silicate in the coating.

[0036] The beneficial effects of the present invention are as follows: the anti-corrosion coating of the oil storage tank of the present invention is a two-component compound coating that is cured after application. The resulting anti-corrosion coating has excellent adhesion, hydrophobicity and oleophobicity, heat resistance and chemical corrosion resistance, and is particularly suitable for the anti-corrosion of oil storage tanks.

[0037] The preparation method of the present invention is simple to operate, easy to control, has high production efficiency, low production cost, and can be used for large-scale production. Detailed Implementation

[0038] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments. The content mentioned in the embodiments is not intended to limit the present invention.

[0039] Example 1

[0040] An anti-corrosion coating for an oil storage tank is composed of component A and component B in a weight ratio of 8:1.

[0041] Component A comprises the following raw materials in parts by weight:

[0042]

[0043] Component B comprises the following raw materials in parts by weight:

[0044] 65 parts of amine curing agent

[0045] Six parts of curing accelerator.

[0046] The bisphenol A type epoxy resin is E-51.

[0047] The preparation method of each of the modified epoxy resin prepolymers includes the following steps:

[0048] (R1) Take 40 parts by weight of fluoroalcohol vinyl ether, 20 parts of N,N-dimethyl-N'-β-(aminoethyl)-γ-aminopropyltriethoxysilane, 20 parts of methanol, 25 parts of triethylamine, 1.5 parts of dibutyltin dilaurate catalyst and 70 parts of bisphenol A diglycidyl ether, and set aside.

[0049] (R2) After mixing methanol and triethylamine evenly, add fluoroethanol vinyl ether and mix, then heat to 48°C and keep warm for 5.5 hours. After washing with water and allowing to stand for separation, take the lower layer to obtain the pre-reaction solution.

[0050] (R3) The pre-reaction solution was mixed with N,N-dimethyl-N'-β-(aminoethyl)-γ-aminopropyltriethoxysilane and heated to 60°C for 4 hours to obtain fluorinated siloxane.

[0051] (R4) Add dibutyltin dilaurate catalyst and bisphenol A diglycidyl ether to fluorinated modified siloxane, stir and heat to 80°C for 2 hours under nitrogen protection to obtain modified epoxy resin prepolymer.

[0052] The active diluent is a mixture of alkylene glycidyl ether and dodecyl glycidyl ether in a weight ratio of 6:1.

[0053] The particle size of the nano-zinc silicate is 80 nm.

[0054] The coupling agent is a mixture of fluorinated coupling agent YS-1701 and silane coupling agent KH560 in a weight ratio of 0.015:1.

[0055] The dispersant is BYK-AT204; the defoamer is polyether defoamer PE6200.

[0056] The amine curing agent is a mixture of polyetheramine D-230 and polyamide curing agent 125 in a weight ratio of 4:1.

[0057] The curing accelerator is triethylamine.

[0058] The method for preparing the anti-corrosion coating for the oil storage tank includes the following steps:

[0059] (S1) Preparation of component A: Take bisphenol A type epoxy resin, modified epoxy resin prepolymer, reactive diluent, nano zinc silicate, dispersant, coupling agent and defoamer according to the weight parts, stir at 55℃ for 1.5h, and encapsulate to obtain component A.

[0060] (S2) Preparation of component B: Take amine curing agent and curing accelerator according to the weight parts, stir at room temperature for 40 min, and encapsulate to obtain component B;

[0061] When using, mix component A and component B evenly according to the above weight ratio to obtain the anti-corrosion coating for the oil storage tank.

[0062] Example 2

[0063] An anti-corrosion coating for an oil storage tank is composed of component A and component B in a weight ratio of 6:1.

[0064] Component A comprises the following raw materials in parts by weight:

[0065]

[0066] Component B comprises the following raw materials in parts by weight:

[0067] 45 parts of amine curing agent

[0068] 1 part curing accelerator.

[0069] The bisphenol A type epoxy resin is E-51.

[0070] The preparation method of each of the modified epoxy resin prepolymers includes the following steps:

[0071] (R1) Take 30 parts by weight of fluoroalcohol vinyl ether, 15 parts of N,N-dimethyl-N'-β-(aminoethyl)-γ-aminopropyltriethoxysilane, 15 parts of methanol, 20 parts of triethylamine, 1 part of dibutyltin dilaurate catalyst and 50 parts of bisphenol A diglycidyl ether, and set aside.

[0072] (R2) After mixing methanol and triethylamine evenly, add fluoroethanol vinyl ether and mix, then heat to 45°C and keep warm for 6 hours. After washing with water and allowing to stand for separation, take the lower layer to obtain the pre-reaction solution.

[0073] (R3) The pre-reaction solution was mixed with N,N-dimethyl-N'-β-(aminoethyl)-γ-aminopropyltriethoxysilane and heated to 60°C for 4 hours to obtain fluorinated siloxane.

[0074] (R4) Add dibutyltin dilaurate catalyst and bisphenol A diglycidyl ether to fluorinated modified siloxane, stir and heat to 80°C for 2 hours under nitrogen protection to obtain modified epoxy resin prepolymer.

[0075] The active diluent is a mixture of alkylene glycidyl ether and dodecyl glycidyl ether in a weight ratio of 5:1.

[0076] The particle size of the nano-zinc silicate is 80 nm.

[0077] The coupling agent is a mixture of fluorinated coupling agent YS-1701 and silane coupling agent KH560 in a weight ratio of 0.01:1.

[0078] The dispersant is BYK-AT204; the defoamer is polyether defoamer PE6200.

[0079] The amine curing agent is a mixture of polyetheramine D-230 and polyamide curing agent 125 in a weight ratio of 3:1.

[0080] The curing accelerator is triethylamine.

[0081] The method for preparing the anti-corrosion coating for the oil storage tank includes the following steps:

[0082] (S1) Preparation of component A: Take bisphenol A type epoxy resin, modified epoxy resin prepolymer, reactive diluent, nano zinc silicate, dispersant, coupling agent and defoamer according to the weight parts, stir at 50°C for 1 hour, and encapsulate to obtain component A.

[0083] (S2) Preparation of component B: Take amine curing agent and curing accelerator according to the weight parts, stir at room temperature for 40 min, and encapsulate to obtain component B;

[0084] When using, mix component A and component B evenly according to the above weight ratio to obtain the anti-corrosion coating for the oil storage tank.

[0085] Example 3

[0086] An anti-corrosion coating for an oil storage tank is composed of component A and component B in a weight ratio of 10:1.

[0087] Component A comprises the following raw materials in parts by weight:

[0088]

[0089]

[0090] Component B comprises the following raw materials in parts by weight:

[0091] 85 parts of amine curing agent

[0092] 12 parts of curing accelerator.

[0093] The bisphenol A type epoxy resin is E-51.

[0094] The preparation method of each of the modified epoxy resin prepolymers includes the following steps:

[0095] (R1) Take 60 parts by weight of fluoroalcohol vinyl ether, 30 parts of N,N-dimethyl-N'-β-(aminoethyl)-γ-aminopropyltriethoxysilane, 25 parts of methanol, 30 parts of triethylamine, 2 parts of dibutyltin dilaurate catalyst and 80 parts of bisphenol A diglycidyl ether, and set aside.

[0096] (R2) After mixing methanol and triethylamine evenly, add fluoroethanol vinyl ether and mix, then heat to 50°C and keep warm for 5 hours. After washing with water and allowing to stand for separation, take the lower layer to obtain the pre-reaction solution.

[0097] (R3) The pre-reaction solution was mixed with N,N-dimethyl-N'-β-(aminoethyl)-γ-aminopropyltriethoxysilane and heated to 60°C for 4 hours to obtain fluorinated siloxane.

[0098] (R4) Add dibutyltin dilaurate catalyst and bisphenol A diglycidyl ether to fluorinated modified siloxane, stir and heat to 80°C for 2 hours under nitrogen protection to obtain modified epoxy resin prepolymer.

[0099] The active diluent is a mixture of alkylene glycidyl ether and dodecyl glycidyl ether in a weight ratio of 8:1.

[0100] The particle size of the nano-zinc silicate is 80 nm.

[0101] The coupling agent is a mixture of fluorinated coupling agent YS-1701 and silane coupling agent KH560 in a weight ratio of 0.02:1.

[0102] The dispersant is BYK-AT204; the defoamer is polyether defoamer PE6200.

[0103] The amine curing agent is a mixture of polyetheramine D-230 and polyamide curing agent 125 in a weight ratio of 5:1.

[0104] The curing accelerator is triethylamine.

[0105] The method for preparing the anti-corrosion coating for the oil storage tank includes the following steps:

[0106] (S1) Preparation of component A: Take bisphenol A type epoxy resin, modified epoxy resin prepolymer, reactive diluent, nano zinc silicate, dispersant, coupling agent and defoamer according to the weight parts, stir at 60℃ for 2h, and encapsulate to obtain component A.

[0107] (S2) Preparation of component B: Take amine curing agent and curing accelerator according to the weight parts, stir at room temperature for 40 min, and encapsulate to obtain component B;

[0108] When using, mix component A and component B evenly according to the above weight ratio to obtain the anti-corrosion coating for the oil storage tank.

[0109] Example 4

[0110] An anti-corrosion coating for an oil storage tank, comprising component A and component B in a weight ratio of 6-10:1;

[0111] Component A comprises the following raw materials in parts by weight:

[0112]

[0113] Component B comprises the following raw materials in parts by weight:

[0114] 75 parts of amine curing agent

[0115] 10 parts of curing accelerator.

[0116] The bisphenol A type epoxy resin is E-51.

[0117] The preparation method of each of the modified epoxy resin prepolymers includes the following steps:

[0118] (R1) Take 50 parts by weight of fluoroalcohol vinyl ether, 25 parts of N,N-dimethyl-N'-β-(aminoethyl)-γ-aminopropyltriethoxysilane, 18 parts of methanol, 28 parts of triethylamine, 1.8 parts of dibutyltin dilaurate catalyst and 60 parts of bisphenol A diglycidyl ether, and set aside.

[0119] (R2) After mixing methanol and triethylamine evenly, add fluoroethanol vinyl ether and mix, then heat to 47°C and keep warm for 5.5 hours. After washing with water and allowing to stand for separation, take off the lower layer to obtain the pre-reaction solution.

[0120] (R3) The pre-reaction solution was mixed with N,N-dimethyl-N'-β-(aminoethyl)-γ-aminopropyltriethoxysilane and heated to 60°C for 4 hours to obtain fluorinated siloxane.

[0121] (R4) Add dibutyltin dilaurate catalyst and bisphenol A diglycidyl ether to fluorinated modified siloxane, stir and heat to 80°C for 2 hours under nitrogen protection to obtain modified epoxy resin prepolymer.

[0122] The active diluent is a mixture of alkylene glycidyl ether and dodecyl glycidyl ether in a weight ratio of 8:1.

[0123] The particle size of the nano-zinc silicate is 80 nm.

[0124] The coupling agent is a mixture of fluorinated coupling agent YS-1701 and silane coupling agent KH560 in a weight ratio of 0.02:1.

[0125] The dispersant is BYK-AT204; the defoamer is polyether defoamer PE6200.

[0126] The amine curing agent is a mixture of polyetheramine D-230 and polyamide curing agent 125 in a weight ratio of 4:1.

[0127] The curing accelerator is triethylamine.

[0128] The method for preparing the anti-corrosion coating for the oil storage tank includes the following steps:

[0129] (S1) Preparation of component A: Take bisphenol A type epoxy resin, modified epoxy resin prepolymer, reactive diluent, nano zinc silicate, dispersant, coupling agent and defoamer according to the weight parts, stir at 55℃ for 1.2h, and encapsulate to obtain component A;

[0130] (S2) Preparation of component B: Take amine curing agent and curing accelerator according to the weight parts, stir at room temperature for 40 min, and encapsulate to obtain component B;

[0131] When using, mix component A and component B evenly according to the above weight ratio to obtain the anti-corrosion coating for the oil storage tank.

[0132] Comparative Example 1

[0133] The difference between this comparative example and Example 1 is as follows:

[0134] Component A comprises the following raw materials in parts by weight:

[0135] That is, component A does not contain modified epoxy resin prepolymer.

[0136] The method for preparing the anti-corrosion coating for the oil storage tank differs from that in Example 1 in that step (S1) is as follows: bisphenol A type epoxy resin, reactive diluent, nano zinc silicate, dispersant, coupling agent and defoamer are taken by weight, stirred at 55°C for 1.5 h, and then packaged to obtain component A.

[0137] Comparative Example 2

[0138] The difference between this comparative example and Example 1 is as follows:

[0139] The nano zinc silicate is replaced by a nano inorganic filler, which is a mixture of nano zinc silicate and nano silica in a weight ratio of 1:10, and the particle size of both nano zinc silicate and nano silica is 80 nm.

[0140] Comparative Example 3

[0141] The difference between this comparative example and Example 1 is as follows:

[0142] The coupling agent is a mixture of fluorinated coupling agent YS-1701 and silane coupling agent KH560 in a weight ratio of 0.001:1.

[0143] Performance testing

[0144] The anti-corrosion coatings from Examples 1-4 and Comparative Examples 1-3 were used. The curing conditions for these coatings were heat curing at 70°C for 2-3 hours. Adhesion, chemical corrosion resistance, and heat resistance were tested on the anti-corrosion coatings. The test methods were as follows:

[0145] Adhesion test: The test is conducted in accordance with GB / T 9286-2021 Paints and Varnishes Cross-cut Test, and the grade is determined based on the test results;

[0146] Chemical corrosion resistance test: The test was conducted according to the immersion method in GB / T 9274-1988 Determination of resistance to liquid media for paints and varnishes. The tested e-liquid samples were: HALO Tribeca, TATTO SEXY, and Southern Gentleman.

[0147] Heat resistance test: After heat treatment according to GBT 1735-2009 Determination of heat resistance of paints and varnishes, the test is carried out according to GBT9286-2021 Cross-cut test of paints and varnishes, and the grade is evaluated based on the test results.

[0148] The test results are shown in Table 1 below:

[0149]

[0150] As shown in Table 1 above, the anti-corrosion coating for the oil storage tank of the present invention, obtained by coating and curing with a two-component compound, exhibits excellent adhesion, hydrophobicity, oleophobicity, heat resistance, and chemical corrosion resistance, making it particularly suitable for the anti-corrosion of oil storage tanks. Specifically, compared to Comparative Example 1, Example 1 uses a specially modified epoxy resin prepolymer, effectively improving coating adhesion, chemical corrosion resistance, and heat resistance; compared to Comparative Example 2, Example 1 uses nano-zinc silicate, which more effectively exerts its barrier protection effect and heat resistance; compared to Comparative Example 3, Example 1 uses a coupling agent composed of fluorinated coupling agent YS-1701 and silane coupling agent KH560 mixed at a weight ratio of 0.015:1, which more effectively utilizes the coupling agent, significantly enhancing interfacial compatibility and reducing interfacial tension.

[0151] The above embodiments are preferred implementations of the present invention. In addition, the present invention can be implemented in other ways. Any obvious substitutions without departing from the concept of the present invention are within the protection scope of the present invention.

Claims

1. An anti-corrosion coating for an oil storage tank, characterized in that, It consists of component A and component B in a weight ratio of 6-10:1; Component A comprises the following raw materials in parts by weight: 30-50 parts of bisphenol A type epoxy resin 15-25 parts of modified epoxy resin prepolymer 10-15 parts of reactive diluent 8-15 parts of nano zinc silicate 0.5-1.5 parts of coupling agent Dispersant 0.5-1.5 parts 0.2-0.5 parts of defoamer; Component B comprises the following raw materials in parts by weight: 45-85 parts of amine curing agent 1-12 parts of curing accelerator; The preparation method of each of the modified epoxy resin prepolymers includes the following steps: (R1) Take 30-60 parts by weight of fluoroalcohol vinyl ether, 15-30 parts of N,N-dimethyl-N'-β-(aminoethyl)-γ-aminopropyltriethoxysilane, 15-25 parts of methanol, 20-30 parts of triethylamine, 1-2 parts of dibutyltin dilaurate catalyst and 50-80 parts of bisphenol A diglycidyl ether, and set aside. (R2) After mixing methanol and triethylamine evenly, add fluoroethanol vinyl ether and mix, then heat to 45-50℃ and keep warm for 5-6 hours. After washing with water and allowing to stand for separation, take the lower layer to obtain the pre-reaction solution. (R3) The pre-reaction solution was mixed with N,N-dimethyl-N'-β-(aminoethyl)-γ-aminopropyltriethoxysilane and heated to 60°C for 4 hours to obtain fluorinated siloxane. (R4) Add dibutyltin dilaurate catalyst and bisphenol A diglycidyl ether to fluorinated modified siloxane, stir and heat to 80°C for 2 hours under nitrogen protection to obtain modified epoxy resin prepolymer. The coupling agent is a mixture of fluorinated coupling agent YS-1701 and silane coupling agent KH560 in a weight ratio of 0.01-0.02:

1.

2. The anti-corrosion coating for an oil storage tank according to claim 1, characterized in that: The bisphenol A type epoxy resin is E-44 or E-51.

3. The anti-corrosion coating for an oil storage tank according to claim 1, characterized in that: The active diluent is at least one of alkylene glycidyl ether, dodecyl glycidyl ether, or 1,4-butanediol diglycidyl ether.

4. The anti-corrosion coating for an oil storage tank according to claim 1, characterized in that: The particle size of the nano-zinc silicate is 40nm-130nm.

5. The anti-corrosion coating for an oil storage tank according to claim 1, characterized in that: The dispersant is BYK-AT204; the defoamer is at least one of polyether defoamer PE6200, silicone polyether defoamer F-521, or polyether defoamer DF-103T.

6. The anti-corrosion coating for an oil storage tank according to claim 1, characterized in that: The amine curing agent is a mixture of polyetheramine D-230 and polyamide curing agent 125 in a weight ratio of 3-5:

1.

7. The anti-corrosion coating for an oil storage tank according to claim 1, characterized in that: The curing accelerator is 2,4,6-tris(dimethylaminomethyl)phenol and / or triethylamine.

8. A method for preparing an anti-corrosion coating for an oil storage tank as described in any one of claims 1-7, characterized in that, Includes the following steps: (S1) Preparation of component A: Take bisphenol A type epoxy resin, modified epoxy resin prepolymer, reactive diluent, nano zinc silicate, dispersant, coupling agent and defoamer according to the weight parts, stir at 50-60℃ for 1-2h, and encapsulate to obtain component A. (S2) Preparation of component B: Take amine curing agent and curing accelerator according to the weight parts, stir at room temperature for 30-60 min, and encapsulate to obtain component B; When using, mix component A and component B evenly at a weight ratio of 6-10:1 to obtain the anti-corrosion coating for the oil storage tank.

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