Anti-corrosion and anti-adhesion epoxy resin-based paint in storage tank and preparation method thereof

Abstract

The invention relates to the technical field of anti-corrosion coatings, and particularly discloses an anti-corrosion and anti-adhesion epoxy resin-based coating in a storage tank and a preparation method thereof. The anti-corrosion and anti-adhesion epoxy resin-based paint in the storage tank comprises a component A and a component B, the component A is prepared from the following raw materials in parts by mass: 50 to 60 parts of hyperbranched epoxy resin, 0.5 to 1 part of dispersing agent, 0.5 to 0.9 part of defoaming agent, 0.3 to 0.6 part of flatting agent, 12 to 17 parts of anti-rust pigment, 12 to 17 parts of mica powder, 0.4 to 0.5 part of anti-settling agent, 5.3 to 10 parts of diluent and 4 to 8 parts of 3A molecular sieve; the component B comprises the following raw materials in parts by mass: 95-105 parts of a curing agent; wherein the hyperbranched epoxy resin contains a modified epoxy monomer and fluorosilane modified nano silicon dioxide. The anti-corrosion and anti-adhesion epoxy resin-based paint in the storage tank has the advantage that the defect that the anti-corrosion and anti-adhesion performance of the inner wall of the storage tank are still insufficient can be overcome.

Description

Technical Field

[0001] The present application relates to the technical field of anti-corrosion coatings, and more specifically, to an anti-corrosion and anti-adhesion epoxy resin-based coating for use in storage tanks and a preparation method thereof. Background Art

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

[0003] At present, the commonly used anti-corrosion coatings for storage tanks are mainly epoxy resin-based coatings. Epoxy resin-based coatings have good adhesion and chemical corrosion resistance. However, epoxy resin has the problem of high brittleness. The impact generated when materials enter and exit the storage tank or the vibration generated during transportation can easily cause cracks in the inner wall of the tank, causing the inner wall of the tank to be exposed to the medium, accelerating corrosion and reducing the adhesion of the coating. Summary of the Invention

[0004] In order to improve the defects of insufficient anti-corrosion and anti-adhesion of the inner wall of the storage tank, the present application provides an anti-corrosion and anti-adhesion epoxy resin-based coating for the inner wall of the storage tank and a preparation method thereof.

[0005] In the first aspect, the present application provides an anti-corrosion and anti-adhesion epoxy resin-based coating for storage tanks, which adopts the following technical solution: An anti-corrosion and anti-adhesion epoxy resin-based coating for storage tanks, comprising a component A and a component B; the component A comprises the following raw materials in parts by weight: 50-60 parts of a hyperbranched epoxy resin, 0.5-1 part of a dispersant, 0.5-0.9 parts of a defoamer, 0.3-0.6 parts of a leveling agent, 12-17 parts of an anti-rust pigment, 12-17 parts of mica powder, 0.4-0.5 parts of an anti-settling agent, 5.3-10 parts of a diluent, and 4-8 parts of a 3A molecular sieve; the component B comprises the following raw materials in parts by weight: 95-105 parts of a curing agent; The hyperbranched epoxy resin contains modified epoxy monomer and fluorosilane-modified nano-silica.

[0006] Because hyperbranched molecules contain a large number of side chains 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 the 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 the fluorosilane-modified nano-silica give the coating low surface energy properties, thereby improving the hydrophobicity and anti-adhesion properties of the coating, reducing medium residue and microbial attachment, and nano-silica can improve the wear resistance of the coating and delay the penetration of corrosive media.

[0007] Preferably, the hyperbranched epoxy resin comprises the following raw materials: 11.5-12.9 g of salicylaldehyde, 80-100 ml of anhydrous ethanol, 3-3.7 ml of ethylenediamine, 7-8.68 ml of modified epoxy monomer, 0.3-0.66 g of tetrabutylammonium bromide, and 70-80 ml of tetrahydrofuran.

[0008] Preferably, the preparation method of the hyperbranched epoxy resin is as follows: 11.5-12.9g of salicylaldehyde and 80-100ml of anhydrous ethanol are weighed, the temperature is raised to 70-90°C, 3-3.7ml of ethylenediamine is added dropwise, and after the solution is completely added, the condenser is refluxed, the reaction is carried out for 3-5h, and the mixture is cooled to room temperature. The solution is filtered, washed with anhydrous ethanol 2-4 times, and dried at 70-90°C for 11-13h to obtain a mixture, 7-8.68ml of modified epoxy monomer and 0.3-0.66g of tetrabutylammonium bromide are added, the temperature is raised to 75-85°C, the condenser is refluxed, the reaction is carried out for 3-5h, and the mixture is cooled to room temperature. 70-80ml of tetrahydrofuran is added to completely dissolve the mixture, deionized water is added, the catalyst and small molecular products in the reaction process are removed, the reaction is repeated 2-4 times, and the resulting product is dried at 75-85°C for 23-25h to obtain a hyperbranched epoxy resin.

[0009] Since the aldehyde group of salicylic aldehyde reacts with the amino group of ethylenediamine to form an imine bond, polar cross-linking sites are introduced into the hyperbranched structure, enhancing the compatibility with epoxy resin and the cohesion of the coating. The phenolic hydroxyl group in the molecule can participate in the subsequent epoxy ring-opening reaction, covalently grafting the salicylic aldehyde unit to the hyperbranched skeleton, thereby improving the adhesion of the coating. At the same time, its benzene ring structure gives the molecule rigidity, and cooperates with the flexibility of the branch chain to regulate the glass transition temperature of the resin, making the coating less likely to crack brittlely due to being too hard.

[0010] Preferably, the modified epoxy monomer comprises the following raw materials: 2-4 g of fluorosilane-modified nano-silica, 25-35 mL of toluene, 10-20 g of catalyst and 1-1.6 ml of allyl glycidyl ether.

[0011] Preferably, the preparation method of the modified epoxy monomer is as follows: weigh 2-4 g of fluorosilane-modified nano-silica, 25-35 mL of toluene and 10-20 g of catalyst, stir at 30-50 ° C for 1-3 hours, add 1-1.6 ml of allyl glycidyl ether dropwise, react for 0.5-1.5 hours, then heat to 75-85 ° C, and react for 11-13 hours.

[0012] 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.

[0013] Preferably, the fluorosilane-modified nano-silica comprises the following raw materials: 4-6 g of nano-silica, 0.25-0.75 g of a silane coupling agent, 10-20 ml of deionized water, 1-2 g of a fluoromethylsilane oligomer, and 0.025-0.1 g of a catalyst.

[0014] Preferably, the preparation method of the fluorosilane-modified nano-silica is as follows: 4-6 g of nano-silica, 0.25-0.75 g of silane coupling agent and 10-20 ml of deionized water are weighed and mixed in a ball mill for 1-2 hours, and vacuum dried overnight at 75-85° C. to obtain amino-modified nano-silica, 1-2 g of fluoromethylsilane oligomer and 0.025-0.1 g of catalyst are added and mixed in a ball mill for 0.5-1.5 hours, washed with anhydrous ethanol 2-4 times, and vacuum dried at 70-90° C. for 23-25 hours.

[0015] Since the fluorine group in the fluoromethylsilicone hydride oligomer has low surface energy, it is beneficial to improve the anti-adhesion property of the coating. At the same time, the silicon-hydrogen bond in the fluoromethylsilicone hydride oligomer can undergo dehydrogenation reaction with the amino group of the amino-treated nano-silica, which is beneficial to achieve directional grafting of the fluorine silicon group.

[0016] Preferably, the fluoromethylsilyl hydrogen oligomer comprises the following raw materials: 5-7.5 ml of n-butyl lithium, 9-11.6 g of trifluoropropylmethylcyclotrisiloxane, 20-30 ml of tetrahydrofuran and 1-1.08 g of dimethylchlorosilane.

[0017] Preferably, the preparation method of the fluoromethylsilyl hydride oligomer is as follows: 5-7.5 ml of n-butyllithium solution is placed in an ice-water bath at -1-1°C, followed by dropwise addition of 9-11.6 g of trifluoropropylmethylcyclotrisiloxane and 20-30 ml of tetrahydrofuran, and finally, 1-1.08 g of dimethylchlorosilane is added, and the solution is stirred at 20-30°C overnight, followed by centrifugation of the reaction solution, and the supernatant is subjected to rotary evaporation to remove tetrahydrofuran and residual trifluoropropylmethylcyclotrisiloxane to obtain the fluoromethylsilyl hydride oligomer.

[0018] Since trifluoropropylmethylcyclotrisiloxane has low surface energy characteristics, it is beneficial to give the coating excellent anti-adhesion properties. At the same time, the three-membered ring structure of cyclotrisiloxane has high tension and is easy to open the ring to form a linear polymer under the action of n-butyl lithium, which is beneficial to improving the completeness of the polymerization reaction.

[0019] In a second aspect, the present application provides a method for preparing an anti-corrosion and anti-adhesion epoxy resin-based coating for storage tanks, which adopts the following technical solution: A method for preparing an anti-corrosion and anti-adhesion epoxy resin-based coating for a storage tank comprises 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 a speed of 1000-2000 r / min for 10-20 minutes, 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, and disperse at a speed of 1000-2000 r / min for 8-12 minutes to obtain component A; S2: Mix component A and 95-105 parts of component B to obtain epoxy resin-based coating.

[0020] Dispersants reduce the surface tension of fillers, preventing them from agglomerating and ensuring uniform filler distribution. Defoamers prevent bubbles from forming pinholes in the coating, making it difficult for corrosive media to penetrate through these pinholes, thereby improving the coating's corrosion resistance. Leveling agents reduce the coating's surface tension, promoting uniform coating spread on the inner wall of the storage tank, reducing brush or roller marks, and forming a continuous, dense coating, which in turn improves corrosion resistance. Anti-rust pigments and mica powder work synergistically to form a dual chemical and physical corrosion barrier. Anti-settling agents form a thixotropic structure during storage, preventing delamination of the anti-rust pigment, mica powder, and other components due to gravity settling. This ensures uniform composition and consistent coating performance during application. The addition of diluents reduces coating difficulties or thick edge defects caused by high 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, thereby improving the coating's corrosion resistance. The curing agent reacts with the hyperbranched epoxy resin to form a cross-linked network, converting the liquid coating into a solid coating and imparting excellent mechanical properties.

[0021] In summary, this application has the following beneficial effects: 1. Since hyperbranched molecules contain a large number of side chains 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 the three-dimensional network structure, which is beneficial to improve the brittleness of the coating and reduce the occurrence of cracks. The fluorine silicon groups in the fluorosilane-modified nano-silica give the coating low surface energy properties, thereby improving the hydrophobicity and anti-adhesion properties of the coating, reducing medium residue and microbial attachment, and nano-silica can improve the wear resistance of the coating and delay the penetration of corrosive media.

[0022] 2. Since the aldehyde group of salicylaldehyde reacts with the amino group of ethylenediamine to form an imine bond, polar cross-linking sites are introduced into the hyperbranched structure, thereby enhancing the compatibility with the epoxy resin and the cohesion of the coating. The phenolic hydroxyl group in the molecule can participate in the subsequent epoxy ring-opening reaction, covalently grafting the salicylaldehyde unit to the hyperbranched skeleton, thereby improving the adhesion of the coating. At the same time, its benzene ring structure gives the molecule rigidity, and cooperates with the flexibility of the branch chain to adjust the glass transition temperature of the resin, making the coating less likely to crack brittlely due to being too hard.

[0023] 3. The fluorinated groups grafted onto the surface of fluorosilane-modified nano-silica are beneficial to imparting hydrophobicity to the coating, reducing surface energy, and improving the corrosion resistance and anti-adhesion properties of the coating. Nano-silica is beneficial to improving the hardness and impact resistance of the coating, making the coating less likely to crack. The carbon-carbon double bond of the allyl group in allyl glycidyl ether is beneficial to alleviating the rigidity of the epoxy system and improving the flexibility of the coating. DETAILED DESCRIPTION

[0024] The present application is further described in detail below in conjunction with Examples 1 to 12 and Comparative Example 1.

[0025] raw material Dispersant BYK-163, Hubei Langbowan Biopharmaceutical Co., Ltd.; Defoamer BYK-066n, Shanghai Puhao Chemical Co., Ltd.; Leveling Agent XL480, Guangzhou Situyuan Chemical Co., Ltd.; Anti-rust Pigment, Faber Pigments (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.); Salicylaldehyde (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); Nanosilica (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 J&K Technology Co., Ltd.

[0026] Example 1 A corrosion-resistant 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 mass: 55 parts of hyperbranched epoxy resin, 0.75 parts of dispersant, 0.7 parts of defoaming agent, 0.45 parts of leveling agent, 14.5 parts of anti-rust pigment, 14.5 parts of mica powder, 0.45 parts of anti-settling agent, 7.65 parts of diluent, and 6 parts of 3A molecular sieve; component B comprises the following raw materials in parts by mass: 100 parts of curing agent.

[0027] Specifically, the preparation method of the anti-corrosion and anti-adhesion epoxy resin-based coating for storage tanks includes the following steps: S1: Place 6.25 ml of n-butyl lithium solution in an ice-water bath at 0°C, then dropwise add 10.3 g of trifluoropropylmethylcyclotrisiloxane and 25 ml of tetrahydrofuran, and finally add 1.04 g of dimethylchlorosilane. Stir the solution at 25°C overnight, then centrifuge the reaction solution, and remove the tetrahydrofuran and remaining trifluoropropylmethylcyclotrisiloxane by rotary evaporation to obtain a fluoromethylsilyl oligomer. S2: 5 g of nano-silica, 0.5 g of silane coupling agent KH-550 and 15 ml of deionized water were weighed and mixed in a ball mill for 1.5 h, and vacuum dried at 80 ° C overnight to obtain amino-modified nano-silica. 1.5 g of fluoromethylsilane oligomer and 0.06 g of p-toluenesulfonic acid were added and mixed in a ball mill for 1 h, washed with anhydrous ethanol three times, and vacuum dried at 80 ° C for 24 h to obtain fluorosilane-modified nano-silica; S3: Weigh 3 g of fluorosilane-modified nanosilica, 30 mL of toluene, and 15 g of Karstedt catalyst, stir at 40°C for 2 h, then dropwise add 1.3 ml of allyl glycidyl ether, react for 1 h, then heat to 80°C and react for 12 h to obtain a modified epoxy monomer; S4: Under nitrogen protection, weigh 12.2g of salicylaldehyde and 90ml of anhydrous ethanol, raise the temperature to 80°C, add 3.35ml of ethylenediamine dropwise, after the solution is completely added, reflux the condenser, react for 4h, cool to room temperature, filter the solution, wash with anhydrous ethanol 3 times, and dry at 80°C for 12h to obtain a mixture, then add 7.84ml of modified epoxy monomer and 0.48g of tetrabutylammonium bromide, raise the temperature to 80°C, reflux the condenser, react for 4h, cool to room temperature, add 75ml of tetrahydrofuran to completely dissolve it, add deionized water to remove the catalyst and small molecular products in the reaction process, repeat 3 times, and dry the resulting product at 80°C for 24h to obtain a hyperbranched epoxy resin; 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, disperse at a speed of 1500 r / min for 15 minutes, then 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 sieves, and disperse at a speed of 1500 r / min for 10 minutes to obtain component A; S6: Mix component A and 100 parts of component B evenly to obtain epoxy resin-based coating.

[0028] Example 2-Example 3 The difference from Example 1 is that the added mass fractions of each component of the epoxy resin-based coating are different, as shown in Table 1.

[0029] Table 1. Addition mass percentage of each component of epoxy resin-based coating in Examples 1 to 3 (parts)

[0030] Example 4 The difference from Example 1 is that the hyperbranched epoxy resin is replaced by an epoxy resin with the same added amount.

[0031] Example 5-Example 6 The difference from Example 1 is that the addition amount of each component of the hyperbranched epoxy resin is different, as shown in Table 2.

[0032] Table 2 Addition amount of each component of hyperbranched epoxy resin in Example 1 and Example 5-Example 6

[0033] Example 7-Example 8 The difference from Example 1 is that the addition amounts of the various components of the modified epoxy monomer are different, as shown in Table 3.

[0034] Table 3 Addition amount of each component of modified epoxy monomer in Example 1 and Example 7-Example 8

[0035] Example 9-Example 10 The difference from Example 1 is that the addition amount of each component of the fluorosilane-modified nano-silica is different, as shown in Table 4.

[0036] Table 4 Addition amount of each component of fluorosilane modified nano-silica in Example 1 and Example 9-Example 10

[0037] Example 11-Example 12 The difference from Example 1 is that the addition amounts of the various components of the fluoromethylsilyl hydrogen oligomer are different, as shown in Table 5.

[0038] Table 5 Addition amount of each component of fluoromethylsilyl hydrogen oligomer in Example 1 and Example 11-Example 12

[0039] Comparative Example 1 The difference from Example 1 is that the fluorosilane-modified nano-silica is replaced by an equal amount of fluoromethylsilane oligomer.

[0040] Performance testing 1. Mechanical properties Three samples were taken from Examples 1 to 12 and Comparative Example 1 respectively, and the flexibility of the samples was measured according to GB / T 1731-2020 "Determination of flexibility of paint and putty films", the impact resistance of the samples was measured according to GB / T 1732-2020 "Determination of impact resistance of paint films", and the hardness of the samples was measured according to GB / T 6739-2022 "Determination of hardness of paint films by pencil method for paints and varnishes".

[0041] The test data is shown in Table 6.

[0042] Table 6 Mechanical properties test results of Examples 1-12 and Comparative Example 1

[0043] Combining Example 1 and Comparative Example 1 with Table 6, it can be seen that, relative to Example 1, the flexibility of Comparative Example 1 is ≤3 and the impact resistance is ≥35. This shows that, relative to the addition of conventional fluoromethylsilane oligomers, the addition of fluorosilane-modified nano-silica can effectively solve the problem of high brittleness of epoxy resin-based coatings, thereby improving the anti-corrosion and anti-adhesion properties of epoxy resin-based coatings.

[0044] The reason is that the fluorinated groups grafted on the surface of fluorosilane-modified nano-silica are beneficial to giving the coating hydrophobicity, reducing surface energy, and improving the coating's corrosion resistance and anti-adhesion properties. Nano-silica is beneficial to improving the coating's hardness and impact resistance, making the coating less likely to crack. The allyl carbon-carbon double bond in allyl glycidyl ether is beneficial to alleviating the rigidity of the epoxy system and improving the coating's flexibility.

[0045] Combining Example 1 and Example 2-Example 3 and Table 6, it can be seen that, relative to Example 1, the flexibility of Example 2 and Example 3 is ≤1, the impact resistance of Example 2 is ≥48, and the impact resistance of Example 3 is ≥49. This shows that the added mass fraction of each component of the epoxy resin-based coating affects the solution to the problem of high brittleness of the epoxy resin-based coating, and the added mass fraction of each component of the epoxy resin-based coating in Example 1 is optimal.

[0046] Combining Example 1 and Example 4 with Table 6, it can be seen that, relative to Example 1, the flexibility of Example 4 is ≤4, and the impact resistance of Example 4 is ≥30. This shows that, relative to the addition of conventional epoxy resin, the addition of hyperbranched epoxy resin can effectively solve the problem of high brittleness of epoxy resin-based coatings, thereby improving the anti-corrosion and anti-adhesion properties of epoxy resin-based coatings.

[0047] The reason is that hyperbranched epoxy resin can enhance the flexibility and impact resistance of the coating through its three-dimensional network structure, which is beneficial to improving the brittleness of the coating and reducing the generation of cracks. The fluorosilicone groups in the fluorosilane-modified nano-silica give the coating low surface energy properties, thereby improving the hydrophobicity and anti-adhesion properties of the coating, reducing medium residue and microbial attachment, and nano-silica can improve the wear resistance of the coating and delay the penetration of corrosive media.

[0048] Combining Example 1 and Example 5-Example 6 and Table 6, it can be seen that, relative to Example 1, the flexibility of Example 5 is ≤2, the flexibility of Example 6 is ≤1, and the impact resistance of Example 5 and Example 6 is ≥45. This shows that the addition amount of each component of the hyperbranched epoxy resin affects the solution to the problem of high brittleness of the epoxy resin-based coating, and the addition amount of each component of the hyperbranched epoxy resin in Example 1 is optimal.

[0049] Combining Example 1 and Example 7-Example 8 and Table 6, it can be seen that, relative to Example 1, the flexibility of Example 7 is ≤1, the flexibility of Example 8 is ≤2, and the impact resistance of Example 7 and Example 8 is ≥45. This shows that the addition amount of each component of the modified epoxy monomer affects the solution to the problem of high brittleness of epoxy resin-based coatings, and the addition amount of each component of the modified epoxy monomer in Example 1 is optimal.

[0050] Combining Example 1 and Example 9-Example 10 and Table 6, it can be seen that, relative to Example 1, the flexibility of Example 9 is ≤1, the flexibility of Example 10 is ≤2, and the impact resistance of Example 9 and Example 10 is ≥45. This shows that the addition amount of each component of the fluorosilane-modified nano-silica affects the solution to the problem of high brittleness of the epoxy resin-based coating, and the addition amount of each component of the fluorosilane-modified nano-silica in Example 1 is optimal.

[0051] Combining Example 1 and Example 11-Example 12 with Table 6, it can be seen that, relative to Example 1, the flexibility of Example 11 and Example 12 is both ≤1, and the impact resistance of Example 9 and Example 10 is both ≥45. This shows that the addition amount of each component of the fluoromethylsilicone hydride oligomer affects the solution to the problem of high brittleness of the epoxy resin-based coating, and the addition amount of each component of the fluoromethylsilicone hydride oligomer in Example 1 is optimal.

[0052] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. An anti-corrosion and anti-adhesion epoxy resin-based coating for storage tanks, characterized in that: The invention comprises component A and component B; component A comprises the following raw materials in parts by weight: 50-60 parts of hyperbranched epoxy resin, 0.5-1 parts of dispersant, 0.5-0.9 parts of defoaming agent, 0.3-0.6 parts of leveling agent, 12-17 parts of anti-rust pigment, 12-17 parts of mica powder, 0.4-0.5 parts of anti-settling agent, 5.3-10 parts of diluent, and 4-8 parts of 3A molecular sieve; component B comprises the following raw materials in parts by weight: 95-105 parts of curing agent; The hyperbranched epoxy resin contains modified epoxy monomer and fluorosilane-modified nano-silica.

2. The anti-corrosion and anti-adhesion epoxy resin-based coating for storage tanks according to claim 1, characterized in that: 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.

3. The anti-corrosion and anti-adhesion epoxy resin-based coating for storage tanks according to claim 2, characterized in that: The preparation method of the hyperbranched epoxy resin comprises the following steps: weighing 11.5-12.9 g of salicylaldehyde and 80-100 ml of anhydrous ethanol, heating the mixture to 70-90° C., dropwise adding 3-3.7 ml of ethylenediamine, refluxing the condenser tube after the solution is completely added, reacting for 3-5 hours, cooling the mixture to room temperature, filtering the solution, washing the mixture with anhydrous ethanol 2-4 times, and drying the mixture at 70-90° C. for 11-13 hours to obtain a mixture, adding 7-8.68 ml of a modified epoxy monomer and 0.3-0.66 g of tetrabutylammonium bromide, heating the mixture to 75-85° C., refluxing the condenser tube, reacting for 3-5 hours, cooling the mixture to room temperature, adding 70-80 ml of tetrahydrofuran to completely dissolve the mixture, adding deionized water to remove the catalyst and small molecular products in the reaction process, repeating the cycle 2-4 times, and drying the obtained product at 75-85° C. for 23-25 hours to obtain the hyperbranched epoxy resin.

4. The anti-corrosion and anti-adhesion epoxy resin-based coating for storage tanks according to claim 3, characterized in that: The modified epoxy monomer comprises the following raw materials: 2-4 g of fluorosilane-modified nano-silica, 25-35 mL of toluene, 10-20 g of a catalyst and 1-1.6 ml of allyl glycidyl ether.

5. The anti-corrosion and anti-adhesion epoxy resin-based coating for storage tanks according to claim 4, characterized in that: The preparation method of the modified epoxy monomer comprises the following steps: weighing 2-4 g of fluorosilane-modified nano-silica, 25-35 mL of toluene, and 10-20 g of a catalyst, stirring at 30-50° C. for 1-3 hours, dropwise adding 1-1.6 ml of allyl glycidyl ether, reacting for 0.5-1.5 hours, then heating to 75-85° C. and reacting for 11-13 hours.

6. The anti-corrosion and anti-adhesion epoxy resin-based coating for storage tanks according to claim 5, characterized in that: The fluorosilane-modified nano-silica comprises the following raw materials: 4-6g of nano-silica, 0.25-0.75g of a silane coupling agent, 10-20ml of deionized water, 1-2g of a fluoromethylsilane oligomer and 0.025-0.1g of a catalyst.

7. The anti-corrosion and anti-adhesion epoxy resin-based coating for storage tanks according to claim 6, characterized in that: The preparation method of the fluorosilane-modified nano-silica comprises the following steps: weighing 4-6 g of nano-silica, 0.25-0.75 g of a silane coupling agent, and 10-20 ml of deionized water, mixing the mixture in a ball mill for 1-2 hours, and vacuum drying the mixture at 75-85° C. overnight to obtain amino-modified nano-silica; adding 1-2 g of a fluoromethylsilane oligomer and 0.025-0.1 g of a catalyst, mixing the mixture in a ball mill for 0.5-1.5 hours, washing the mixture with anhydrous ethanol 2-4 times, and vacuum drying the mixture at 70-90° C. for 23-25 hours.

8. The anti-corrosion and anti-adhesion epoxy resin-based coating for storage tanks according to claim 7, characterized in that: The fluoromethylsilyl hydrogen oligomer comprises the following raw materials: 5-7.5 ml of n-butyl lithium, 9-11.6 g of trifluoropropylmethylcyclotrisiloxane, 20-30 ml of tetrahydrofuran and 1-1.08 g of dimethylchlorosilane.

9. The anti-corrosion and anti-adhesion epoxy resin-based coating for storage tanks according to claim 8, characterized in that: The preparation method of the fluoromethylsilyl hydrogen oligomer comprises the following steps: placing 5-7.5 ml of n-butyl lithium solution in an ice-water bath at -1-1° C., then dropwise adding 9-11.6 g of trifluoropropylmethylcyclotrisiloxane and 20-30 ml of tetrahydrofuran, and finally adding 1-1.08 g of dimethylchlorosilane. The solution is stirred at 20-30° C. overnight, and then the reaction liquid is centrifuged. The supernatant is then subjected to rotary evaporation to remove tetrahydrofuran and remaining trifluoropropylmethylcyclotrisiloxane to obtain the fluoromethylsilyl hydrogen oligomer.

10. The method for preparing the anti-corrosion and anti-adhesion epoxy resin-based coating for storage tanks according to any one of claims 1 to 9, characterized in that: The following steps are involved: 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 a speed of 1000-2000 r / min for 10-20 minutes, 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, and disperse at a speed of 1000-2000 r / min for 8-12 minutes to obtain component A; S2: Mix component A and 95-105 parts of component B to obtain epoxy resin-based coating.

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