An anticorrosive and anti-adhesion epoxy resin-based paint for inside of a storage tank and a method for preparing the same

Abstract

This application relates to the field of anti-corrosion coating technology, specifically disclosing an anti-corrosion and anti-adhesion epoxy resin-based coating for storage tanks and its preparation method. The anti-corrosion and anti-adhesion epoxy resin-based coating for storage tanks comprises component A and component B; component A comprises the following raw materials in parts by weight: 50-60 parts hyperbranched epoxy resin, 0.5-1 parts dispersant, 0.5-0.9 parts defoamer, 0.3-0.6 parts leveling agent, 12-17 parts rust-preventive pigment, 12-17 parts mica powder, 0.4-0.5 parts anti-settling agent, 5.3-10 parts diluent, and 4-8 parts 3A molecular sieve; component B comprises the following raw materials in parts by weight: 95-105 parts curing agent; wherein the hyperbranched epoxy resin contains modified epoxy monomers and fluorosilane-modified nano-silica. The anti-corrosion and anti-adhesion epoxy resin-based coating for storage tanks of this application has the advantage of improving the shortcomings in corrosion prevention and anti-adhesion of the inner wall of storage tanks.

Description

Technical Field

[0001] This application relates to the field of anti-corrosion coating technology, and more specifically, it relates to an anti-corrosion and anti-adhesion epoxy resin-based coating for storage tanks and its preparation method. Background Technology

[0002] Storage tanks are widely used in many industries such as petroleum, chemical, and food to store various liquid and gaseous media. However, the inside of the storage tank is in long-term contact with the stored media, making it susceptible to problems such as chemical corrosion, microbial erosion, and the adhesion of impurities in the media. This can lead to malfunctions such as corrosion perforation and leakage inside the storage tank, which not only affects the service life of the storage tank but may also cause safety accidents and environmental pollution.

[0003] Currently, the most commonly used anti-corrosion coatings for storage tanks are epoxy resin-based coatings. Epoxy resin-based coatings have good adhesion and chemical corrosion resistance. However, epoxy resin has the problem of high brittleness. When materials enter or leave the storage tank, the impact or vibration generated during transportation can easily cause cracks in the inner wall of the storage tank, thus exposing the inner wall of the storage tank to the medium, accelerating corrosion and reducing the adhesion of the coating. Summary of the Invention

[0004] In order to improve the shortcomings of the corrosion protection and anti-adhesion of the inner wall of storage tank, this application provides an epoxy resin-based coating for corrosion protection and anti-adhesion of storage tank and its preparation method.

[0005] Firstly, this application provides an anti-corrosion and anti-adhesion epoxy resin-based coating for the interior of storage tanks, which adopts the following technical solution:

[0006] An anti-corrosion and anti-adhesion epoxy resin-based coating for storage tanks, comprising component A and component B; component A comprises the following raw materials in parts by weight: 50-60 parts hyperbranched epoxy resin, 0.5-1 part dispersant, 0.5-0.9 parts defoamer, 0.3-0.6 parts leveling agent, 12-17 parts anti-rust pigment, 12-17 parts mica powder, 0.4-0.5 parts anti-settling agent, 5.3-10 parts diluent, and 4-8 parts 3A molecular sieve; component B comprises the following raw materials in parts by weight: 95-105 parts curing agent;

[0007] The hyperbranched epoxy resin contains modified epoxy monomers and fluorinated silane-modified nano-silica.

[0008] Because hyperbranched molecules contain a large number of branches and terminal functional groups, they form a highly cross-linked network structure after curing, which can significantly improve the anti-corrosion and anti-adhesion properties of the coating. At the same time, the three-dimensional network structure of hyperbranched epoxy resin can enhance the flexibility and impact resistance of the coating, improve the brittleness of the coating, and reduce the generation of cracks. The fluorosilicone groups in fluorosilane-modified nano silica endow the coating with low surface energy characteristics, thereby improving the hydrophobicity and anti-adhesion properties of the coating, reducing media residue and microbial adhesion, and nano silica can improve the wear resistance of the coating and delay the penetration of corrosive media.

[0009] Preferably, the hyperbranched epoxy resin comprises the following raw materials: 11.5-12.9g salicylaldehyde, 80-100ml anhydrous ethanol, 3-3.7ml ethylenediamine, 7-8.68ml modified epoxy monomer, 0.3-0.66g tetrabutylammonium bromide, and 70-80ml tetrahydrofuran.

[0010] Preferably, the preparation method of the hyperbranched epoxy resin is as follows: Weigh 11.5-12.9g of salicylaldehyde and 80-100ml of anhydrous ethanol, heat to 70-90℃, add 3-3.7ml of ethylenediamine dropwise, and after the solution is completely added, reflux in a condenser and react for 3-5 hours. Cool to room temperature, filter the solution, wash 2-4 times with anhydrous ethanol, and dry at 70-90℃ for 11-13 hours to obtain a mixture. Add 7-8.68ml of modified epoxy monomer and 0.3-0.66g of tetrabutylammonium bromide, heat to 75-85℃, reflux in a condenser, and react for 3-5 hours. Cool to room temperature, add 70-80ml of tetrahydrofuran to completely dissolve it, add deionized water to remove the catalyst and small molecule products in the reaction process, cycle 2-4 times, and dry the obtained product at 75-85℃ for 23-25 ​​hours to obtain the hyperbranched epoxy resin.

[0011] Because the aldehyde group of salicylaldehyde undergoes a condensation reaction with the amino group of ethylenediamine to form an imine bond, it introduces polar crosslinking sites into the hyperbranched structure, enhancing compatibility with epoxy resin and coating cohesion. The phenolic hydroxyl groups in its molecule can participate in the subsequent epoxy ring-opening reaction, covalently grafting salicylaldehyde units into the hyperbranched framework, improving the adhesion of the coating. At the same time, its benzene ring structure gives the molecule rigidity, which, together with the flexibility of the branched chain, regulates the glass transition temperature of the resin, making the coating less prone to brittle cracking due to excessive hardness.

[0012] Preferably, the modified epoxy monomer comprises the following raw materials: 2-4g of fluorosilane-modified nano-silica, 25-35mL of toluene, 10-20g of catalyst and 1-1.6ml of allyl glycidyl ether.

[0013] Preferably, the modified epoxy monomer is prepared by weighing 2-4g of fluorosilane-modified nano-silica, 25-35mL of toluene and 10-20g of catalyst, stirring at 30-50℃ for 1-3h, then adding 1-1.6mL of allyl glycidyl ether, reacting for 0.5-1.5h, and then heating to 75-85℃ for 11-13h.

[0014] The fluorinated groups grafted onto the surface of fluorosilane-modified nano-silica are beneficial for imparting hydrophobicity to the coating, reducing surface energy, and improving the coating's corrosion resistance and anti-adhesion properties. Nano-silica is beneficial for improving the coating's hardness and impact resistance, making the coating less prone to cracking. The carbon-carbon double bond of the allyl group in allyl glycidyl ether is beneficial for relieving the rigidity of the epoxy system and improving the coating's flexibility.

[0015] Preferably, the fluorosilane-modified nano silica comprises the following raw materials: 4-6g nano silica, 0.25-0.75g silane coupling agent, 10-20ml deionized water, 1-2g fluoromethylsilane oligomer and 0.025-0.1g catalyst.

[0016] Preferably, the preparation method of the fluorosilane-modified nano silica is as follows: 4-6g of nano silica, 0.25-0.75g of silane coupling agent and 10-20ml of deionized water are weighed and mixed in a ball mill for 1-2h, and then vacuum dried overnight at 75-85℃ to obtain aminated nano silica. 1-2g of fluoromethylsilane oligomer and 0.025-0.1g of catalyst are added and mixed in a ball mill for 0.5-1.5h. The mixture is washed 2-4 times with anhydrous ethanol and vacuum dried at 70-90℃ for 23-25h.

[0017] Because the fluorine groups in fluoromethylsilane oligomers have low surface energy, they are beneficial to improving the anti-adhesion properties of coatings. At the same time, the silane bonds in fluoromethylsilane oligomers can undergo dehydrogenation reactions with the amino groups of aminated nano-silica, which is beneficial to achieving directional grafting of fluorosilicone groups.

[0018] Preferably, the fluoromethylsilane oligomer comprises the following raw materials: 5-7.5 ml n-butyllithium, 9-11.6 g trifluoropropylmethylcyclotrisiloxane, 20-30 ml tetrahydrofuran, and 1-1.08 g dimethylchlorosilane.

[0019] Preferably, the preparation method of the fluoromethylsilane oligomer is as follows: 5-7.5 ml of n-butyllithium solution is placed in an ice-water bath at -1-1°C, then 9-11.6 g of trifluoropropylmethylcyclotrisiloxane and 20-30 ml of tetrahydrofuran are added dropwise, and finally 1-1.08 g of dimethylchlorosilane is added. The solution is stirred overnight at 20-30°C, then the reaction solution is centrifuged, and the clear liquid is rotary evaporated to remove tetrahydrofuran and the remaining trifluoropropylmethylcyclotrisiloxane to obtain the fluoromethylsilane oligomer.

[0020] Because trifluoropropylmethylcyclotrisiloxane has low surface energy, it is beneficial to impart excellent anti-adhesion properties to coatings. At the same time, the three-membered ring structure of cyclotrisiloxane has high strain, and it is easy to open the ring to form a linear polymer under the action of n-butyllithium, which is beneficial to improve the degree of polymerization reaction.

[0021] Secondly, this application provides a method for preparing an anti-corrosion and anti-adhesion epoxy resin-based coating for storage tanks, using the following technical solution:

[0022] A method for preparing an anti-corrosion and anti-adhesion epoxy resin-based coating for the interior of a storage tank includes the following steps:

[0023] S1: Take 50-60 parts of hyperbranched epoxy resin, 0.5-1 parts of dispersant, 0.5-0.9 parts of defoamer and 0.3-0.6 parts of leveling agent, disperse at 1000-2000 r / min for 10-20 min, then add 12-17 parts of anti-rust pigment and 12-17 parts of mica powder, adjust the speed to 2000-3000 r / min for high-speed dispersion until the fineness reaches 35-45 μm, then add 0.4-0.5 parts of anti-settling agent, 5.3-10 parts of diluent and 4-8 parts of 3A molecular sieve, disperse at 1000-2000 r / min for 8-12 min to obtain component A;

[0024] S2: Mix component A with 95-105 parts of component B until homogeneous to obtain epoxy resin-based coating.

[0025] Because dispersants reduce the surface tension of fillers, preventing agglomeration and ensuring uniform filler distribution, defoamers prevent the formation of pinholes in the coating, hindering the penetration of corrosive media and improving the coating's corrosion resistance. Leveling agents reduce the surface tension of the coating, promoting uniform spreading of the coating on the inner wall of the storage tank, reducing brush or roller marks, and forming a continuous, dense coating, further enhancing corrosion resistance. Rust-preventing pigments and mica powder work synergistically to form a dual chemical and physical corrosion barrier. Anti-settling agents form a thixotropic structure during coating storage, preventing stratification caused by gravity settling of rust-preventing pigments and mica powder, ensuring uniform composition and consistent coating performance during application. The addition of diluents minimizes the risk of coating difficulties or thick-edge defects due to excessive viscosity. The porous structure of 3A molecular sieves selectively adsorbs corrosive substances in the storage tank, reducing the corrosion driving force in the material's service environment and thus improving the coating's corrosion resistance. The curing agent reacts with hyperbranched epoxy resin to form a cross-linked network, transforming the liquid coating into a solid coating and imparting excellent mechanical properties to the coating.

[0026] In summary, this application has the following beneficial effects:

[0027] 1. Because hyperbranched molecules contain a large number of branches and terminal functional groups, they form a highly cross-linked network structure after curing, which can significantly improve the anti-corrosion and anti-adhesion properties of the coating. At the same time, hyperbranched epoxy resin can enhance the flexibility and impact resistance of the coating through its three-dimensional network structure, which is beneficial to improve the brittleness of the coating and reduce the generation of cracks. The fluorosilicone groups in fluorosilane-modified nano silica endow the coating with low surface energy characteristics, thereby improving the hydrophobicity and anti-adhesion properties of the coating, reducing media residue and microbial adhesion, and nano silica can improve the wear resistance of the coating and delay the penetration of corrosive media.

[0028] 2. Because the aldehyde group of salicylaldehyde undergoes a condensation reaction with the amino group of ethylenediamine to form an imine bond, it introduces polar crosslinking sites into the hyperbranched structure, enhancing the compatibility with epoxy resin and the cohesive force of the coating. The phenolic hydroxyl group in its molecule can participate in the subsequent epoxy ring-opening reaction, covalently grafting the salicylaldehyde unit into the hyperbranched framework, improving the adhesion of the coating. At the same time, its benzene ring structure gives the molecule rigidity, which, together with the flexibility of the branch chain, regulates the glass transition temperature of the resin, making the coating less prone to brittle cracking due to excessive hardness.

[0029] 3. The fluorinated groups grafted onto the surface of fluorosilane-modified nano-silica are beneficial for imparting hydrophobicity to the coating, reducing surface energy, and improving the coating's corrosion resistance and anti-adhesion properties. Nano-silica is beneficial for improving the coating's hardness and impact resistance, making the coating less prone to cracking. The carbon-carbon double bond of the allyl group in allyl glycidyl ether is beneficial for alleviating the rigidity of the epoxy system and improving the coating's flexibility. Detailed Implementation

[0030] The present application will be further described in detail below with reference to Examples 1-12 and Comparative Example 1.

[0031] raw material

[0032] Dispersant BYK-163 (Hubei Langbowan Biomedical Co., Ltd.); Defoamer BYK-066n (Shanghai Puhao Chemical Co., Ltd.); Leveling agent XL480 (Guangzhou Siteyuan Chemical Co., Ltd.); Rust-inhibiting pigment Faber-Castell Pigment (Shanghai) Co., Ltd.; Mica powder (Shenzhen Haiyang Powder Technology Co., Ltd.); Anti-settling agent BYK-410 Jining Tangyi Chemical Co., Ltd.; Butyl acetate Shanghai Maclean Biochemical Technology Co., Ltd.; 3A molecular sieve Langfang Qianyao Technology Co., Ltd.; Curing agent Shandong Shengteng Chemical Co., Ltd.; Salicylic acid CAS: 90-02-8; Anhydrous ethanol CAS: 64-17-5; Ethylenediamine CAS: 107-15-3; Tetrabutylammonium bromide Hubei Xinghengye Technology Co., Ltd.; Tetrahydrofuran CAS: 109-99-9; Deionized water CAS: 7732-18-5; Toluene CAS: 108-88-3; Karstedt catalyst Beijing Hanlongda Technology Development Co., Ltd.; Allyl glycidyl ether CAS: 106-92-3; Nano silica Nanjing Jike Biotechnology Co., Ltd.; Silane coupling agent KH-550 Shandong Rongsheng New Materials Co., Ltd.; p-Toluenesulfonic acid CAS: 104-15-4; n-Butyllithium CAS: 109-72-8; Trifluoropropylmethylcyclotrisiloxane CAS: 2374-14-3; Dimethylchlorosilane Bailingwei Technology Co., Ltd.

[0033] Example 1

[0034] An anti-corrosion and anti-adhesion epoxy resin-based coating for storage tanks includes component A and component B. Component A includes the following raw materials in parts by weight: 55 parts hyperbranched epoxy resin, 0.75 parts dispersant, 0.7 parts defoamer, 0.45 parts leveling agent, 14.5 parts anti-rust pigment, 14.5 parts mica powder, 0.45 parts anti-settling agent, 7.65 parts diluent, and 6 parts 3A molecular sieve. Component B includes the following raw materials in parts by weight: 100 parts curing agent.

[0035] Specifically, the preparation method of the anti-corrosion and anti-adhesion epoxy resin-based coating for the inside of the storage tank includes the following steps:

[0036] S1: Place 6.25 ml of n-butyllithium solution in an ice-water bath at 0°C, then add 10.3 g of trifluoropropylmethylcyclotrisiloxane and 25 ml of tetrahydrofuran, and finally add 1.04 g of dimethylchlorosilane. Stir the solution overnight at 25°C, then centrifuge the reaction solution, and take the supernatant to remove tetrahydrofuran and the remaining trifluoropropylmethylcyclotrisiloxane by rotary evaporation to obtain fluoromethylsilane oligomer.

[0037] S2: Weigh 5g of nano silica, 0.5g of silane coupling agent KH-550 and 15ml of deionized water and mix them in a ball mill for 1.5h. Then, vacuum dry them overnight at 80℃ to obtain aminated nano silica. Add 1.5g of fluoromethylsilane oligomer and 0.06g of p-toluenesulfonic acid and mix them in a ball mill for 1h. Wash them three times with anhydrous ethanol and vacuum dry them for 24h at 80℃ to obtain fluorosilane modified nano silica.

[0038] S3: Weigh 3g of fluorosilane-modified nano-silica, 30mL of toluene and 15g of Karstedt catalyst, stir at 40℃ for 2h, add 1.3ml of allyl glycidyl ether dropwise, react for 1h, then raise the temperature to 80℃ and react for 12h to obtain the modified epoxy monomer.

[0039] S4: Under nitrogen protection, weigh 12.2g of salicylaldehyde and 90ml of anhydrous ethanol, heat to 80℃, add 3.35ml of ethylenediamine dropwise, and after the solution is completely added, reflux in a condenser and react for 4h. Cool to room temperature, filter the solution, wash three times with anhydrous ethanol, and dry at 80℃ for 12h to obtain a mixture. Then add 7.84ml of modified epoxy monomer and 0.48g of tetrabutylammonium bromide, heat to 80℃, reflux in a condenser, and react for 4h. Cool to room temperature, add 75ml of tetrahydrofuran to completely dissolve it, add deionized water to remove the catalyst and small molecule products in the reaction process, cycle three times, and dry the obtained product at 80℃ for 24h to obtain hyperbranched epoxy resin.

[0040] S5: Take 55 parts of hyperbranched epoxy resin, 0.75 parts of dispersant BYK-163, 0.7 parts of defoamer BYK-066n, and 0.45 parts of leveling agent XL480. After dispersing at 1500 r / min for 15 min, add 14.5 parts of anti-rust pigment and 14.5 parts of mica powder. Adjust the speed to 2500 r / min for high-speed dispersion until the fineness reaches 40 μm. Then add 0.45 parts of anti-settling agent BYK-410, 7.65 parts of diluent butyl acetate, and 6 parts of 3A molecular sieve. Disperse at 1500 r / min for 10 min to obtain component A.

[0041] S6: Mix component A with 100 parts of component B until homogeneous to obtain epoxy resin-based coating.

[0042] Example 2-Example 3

[0043] The difference from Example 1 is that the mass fractions of each component added to the epoxy resin-based coating are different, as shown in Table 1.

[0044] Table 1. Mass parts of each component added in the epoxy resin-based coatings of Examples 1-3 (parts)

[0045]

[0046] Example 4

[0047] The difference from Example 1 is that the hyperbranched epoxy resin is replaced with an equal amount of epoxy resin.

[0048] Examples 5-6

[0049] The difference from Example 1 is that the amount of each component of the hyperbranched epoxy resin added is different, as shown in Table 2.

[0050] Table 2. Addition amounts of each component of the hyperbranched epoxy resin in Examples 1 and 5-6.

[0051]

[0052] Examples 7-8

[0053] The difference from Example 1 is that the amount of each component added to the modified epoxy monomer is different, as shown in Table 3.

[0054] Table 3. Amounts of each component added to the modified epoxy monomer in Examples 1 and 7-8.

[0055]

[0056] Examples 9-10

[0057] The difference from Example 1 is that the amount of each component added to the fluorosilane-modified nano-silica is different, as shown in Table 4.

[0058] Table 4. Amounts of each component added in fluorosilane-modified nano-silica in Examples 1 and 9-10

[0059]

[0060] Examples 11-12

[0061] The difference from Example 1 is that the amount of each component added to the fluoromethylsilane oligomer is different, as shown in Table 5.

[0062] Table 5. Amounts of each component added to the fluoromethylsilane oligomers in Examples 1 and 11-12

[0063]

[0064] Comparative Example 1

[0065] The difference from Example 1 is that the fluorosilane-modified nano-silica is replaced with an equal amount of fluoromethylsilane oligomer.

[0066] Performance testing

[0067] I. Mechanical Properties

[0068] Three samples were taken from Examples 1-12 and Comparative Example 1 respectively. The flexibility of the samples was determined according to GB / T 1731-2020 "Test Method for Flexibility of Paint Film and Putty Film", the impact resistance of the samples was determined according to GB / T 1732-2020 "Test Method for Impact Resistance of Paint Film", and the hardness of the samples was determined according to GB / T 6739-2022 "Determination of Hardness of Paint Film by Pencil Method for Paints and Varnishes".

[0069] The test data is shown in Table 6.

[0070] Table 6. Test results of mechanical properties of Examples 1-12 and Comparative Example 1

[0071]

[0072] Combining Example 1 and Comparative Example 1 with Table 6, it can be seen that, compared with Example 1, Comparative Example 1 has a flexibility of ≤3 and an impact resistance of ≥35. This shows that, compared with adding conventional fluoromethylsilyl oligomers, adding fluorosilane-modified nano-silica can effectively solve the problem of high brittleness in epoxy resin-based coatings, thereby improving the anti-corrosion and anti-adhesion properties of epoxy resin-based coatings.

[0073] The reason for this is that the fluorinated groups grafted onto the surface of fluorosilane-modified nano-silica are beneficial for imparting hydrophobicity to the coating, reducing surface energy, and improving the coating's corrosion resistance and anti-adhesion properties. Nano-silica is beneficial for improving the coating's hardness and impact resistance, making the coating less prone to cracking. The carbon-carbon double bond of the allyl group in allyl glycidyl ether is beneficial for relieving the rigidity of the epoxy system and improving the coating's flexibility.

[0074] Combining Examples 1 and 2-3 with Table 6, it can be seen that, compared to Example 1, the flexibility of Examples 2 and 3 is ≤1, the impact resistance of Example 2 is ≥48, and the impact resistance of Example 3 is ≥49. This indicates that the mass fraction of each component added to the epoxy resin-based coating affects the solution to the problem of high brittleness of epoxy resin-based coatings, and the mass fraction of each component added to the epoxy resin-based coating in Example 1 is optimal.

[0075] Combining Examples 1 and 4 with Table 6, it can be seen that, compared to Example 1, the flexibility of Example 4 is ≤4 and the impact resistance of Example 4 is ≥30. This indicates that, compared to adding conventional epoxy resin, adding hyperbranched epoxy resin can effectively solve the problem of high brittleness in epoxy resin-based coatings, thereby improving the anti-corrosion and anti-adhesion properties of epoxy resin-based coatings.

[0076] The reason for this is that hyperbranched epoxy resins can enhance the flexibility and impact resistance of the coating through a three-dimensional network structure, which helps to improve the brittleness of the coating and reduce the generation of cracks. Meanwhile, the fluorosilicone groups in fluorosilane-modified nano-silica endow the coating with low surface energy characteristics, thereby improving the hydrophobicity and anti-adhesion properties of the coating, reducing media residue and microbial adhesion, and nano-silica can improve the wear resistance of the coating and delay the penetration of corrosive media.

[0077] Combining Examples 1 and 5-6 with Table 6, it can be seen that, compared to Example 1, the flexibility of Example 5 is ≤2, the flexibility of Example 6 is ≤1, and the impact resistance of Examples 5 and 6 is ≥45. This indicates that the amount of each component of the hyperbranched epoxy resin added affects the solution to the problem of high brittleness of epoxy resin-based coatings, and the amount of each component of the hyperbranched epoxy resin added in Example 1 is optimal.

[0078] Combining Examples 1 and 7-8 with Table 6, it can be seen that, compared to Example 1, the flexibility of Example 7 is ≤1, the flexibility of Example 8 is ≤2, and the impact resistance of Examples 7 and 8 is ≥45. This indicates that the amount of each component added to the modified epoxy monomer affects the solution to the problem of high brittleness of epoxy resin-based coatings, and the amount of each component added to the modified epoxy monomer in Example 1 is optimal.

[0079] Combining Examples 1 and 9-10 with Table 6, it can be seen that, compared to Example 1, the flexibility of Example 9 is ≤1, the flexibility of Example 10 is ≤2, and the impact resistance of Examples 9 and 10 is ≥45. This indicates that the amount of each component added to the fluorosilane-modified nano-silica affects the solution to the problem of high brittleness in epoxy resin-based coatings, and the amount of each component added to the fluorosilane-modified nano-silica in Example 1 is optimal.

[0080] Combining Examples 1 and 11-12 with Table 6, it can be seen that, compared to Example 1, the flexibility of Examples 11 and 12 is ≤1, and the impact resistance of Examples 9 and 10 is ≥45. This indicates that the amount of each component of the fluoromethylsilane oligomer affects the solution to the problem of high brittleness of epoxy resin-based coatings, and the amount of each component of the fluoromethylsilane oligomer in Example 1 is optimal.

[0081] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A corrosion-resistant and anti-adhesion epoxy resin-based coating for the interior of a storage tank, characterized in that, The product comprises component A and component B. Component A comprises the following raw materials in parts by weight: 50-60 parts hyperbranched epoxy resin, 0.5-1 part dispersant, 0.5-0.9 parts defoamer, 0.3-0.6 parts leveling agent, 12-17 parts rust-preventive pigment, 12-17 parts mica powder, 0.4-0.5 parts anti-settling agent, 5.3-10 parts diluent, and 4-8 parts 3A molecular sieve. Component B comprises the following raw materials in parts by weight: 95-105 parts curing agent. The hyperbranched epoxy resin comprises the following raw materials: 11.5-12.9g salicylaldehyde, 80-100ml anhydrous ethanol, 3-3.7ml ethylenediamine, 7-8.68ml modified epoxy monomer, 0.3-0.66g tetrabutylammonium bromide, 70-80ml tetrahydrofuran; The modified epoxy monomer comprises the following raw materials: 2-4g of fluorosilane-modified nano-silica, 25-35mL of toluene, 10-20g of catalyst and 1-1.6ml of allyl glycidyl ether.

2. The anti-corrosion and anti-adhesion epoxy resin-based coating for the interior of a storage tank according to claim 1, characterized in that: The preparation method of the hyperbranched epoxy resin is as follows: Weigh 11.5-12.9g of salicylaldehyde and 80-100ml of anhydrous ethanol, heat to 70-90℃, add 3-3.7ml of ethylenediamine dropwise, and after the solution is completely added, reflux in a condenser and react for 3-5 hours. Cool to room temperature, filter the solution, wash 2-4 times with anhydrous ethanol, and dry at 70-90℃ for 11-13 hours to obtain a mixture. Add 7-8.68ml of modified epoxy monomer and 0.3-0.66g of tetrabutylammonium bromide, heat to 75-85℃, reflux in a condenser, and react for 3-5 hours. Cool to room temperature, add 70-80ml of tetrahydrofuran to completely dissolve it, add deionized water to remove the catalyst and small molecule products in the reaction process, cycle 2-4 times, and dry the obtained product at 75-85℃ for 23-25 ​​hours to obtain the hyperbranched epoxy resin.

3. The anti-corrosion and anti-adhesion epoxy resin-based coating for the interior of a storage tank according to claim 1, characterized in that, The modified epoxy monomer is prepared by weighing 2-4g of fluorosilane-modified nano-silica, 25-35mL of toluene and 10-20g of catalyst, stirring at 30-50℃ for 1-3h, then adding 1-1.6mL of allyl glycidyl ether, reacting for 0.5-1.5h, and then heating to 75-85℃ for 11-13h.

4. The anti-corrosion and anti-adhesion epoxy resin-based coating for the interior of a storage tank according to claim 3, characterized in that, The fluorosilane-modified nano silica comprises the following raw materials: 4-6g nano silica, 0.25-0.75g silane coupling agent, 10-20ml deionized water, 1-2g fluoromethylsilane oligomer and 0.025-0.1g catalyst.

5. The anti-corrosion and anti-adhesion epoxy resin-based coating for the interior of a storage tank according to claim 4, characterized in that, The preparation method of the fluorosilane-modified nano silica is as follows: Weigh 4-6g of nano silica, 0.25-0.75g of silane coupling agent and 10-20ml of deionized water and mix them in a ball mill for 1-2h. Then, vacuum dry overnight at 75-85℃ to obtain aminated nano silica. Add 1-2g of fluoromethylsilane oligomer and 0.025-0.1g of catalyst and mix in a ball mill for 0.5-1.5h. Wash with anhydrous ethanol 2-4 times and vacuum dry at 70-90℃ for 23-25h.

6. The anti-corrosion and anti-adhesion epoxy resin-based coating for the interior of a storage tank according to claim 5, characterized in that, The fluoromethylsilane oligomer comprises the following raw materials: 5-7.5 ml n-butyllithium, 9-11.6 g trifluoropropylmethylcyclotrisiloxane, 20-30 ml tetrahydrofuran, and 1-1.08 g dimethylchlorosilane.

7. The anti-corrosion and anti-adhesion epoxy resin-based coating for the interior of a storage tank according to claim 6, characterized in that, The preparation method of the fluoromethylsilane oligomer is as follows: 5-7.5 ml of n-butyllithium solution is placed in an ice-water bath at -1 to 1°C, then 9-11.6 g of trifluoropropylmethylcyclotrisiloxane and 20-30 ml of tetrahydrofuran are added dropwise, and finally 1-1.08 g of dimethylchlorosilane is added. The solution is stirred overnight at 20-30°C, and then the reaction solution is centrifuged. The clear liquid is then removed by rotary evaporation to remove tetrahydrofuran and the remaining trifluoropropylmethylcyclotrisiloxane, thus obtaining the fluoromethylsilane oligomer.

8. A method for preparing an anti-corrosion and anti-adhesion epoxy resin-based coating for the interior of a storage tank according to any one of claims 1-7, characterized in that, Includes the following steps: S1: Take 50-60 parts of hyperbranched epoxy resin, 0.5-1 parts of dispersant, 0.5-0.9 parts of defoamer and 0.3-0.6 parts of leveling agent, disperse at 1000-2000 r / min for 10-20 min, then add 12-17 parts of anti-rust pigment and 12-17 parts of mica powder, adjust the speed to 2000-3000 r / min for high-speed dispersion until the fineness reaches 35-45 μm, then add 0.4-0.5 parts of anti-settling agent, 5.3-10 parts of diluent and 4-8 parts of 3A molecular sieve, disperse at 1000-2000 r / min for 8-12 min to obtain component A; S2: Mix component A with 95-105 parts of component B until homogeneous to obtain epoxy resin-based coating.

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