Corrosion-resistant pump coating and preparation method thereof

Abstract

The invention relates to the technical field of coatings, and discloses a corrosion-resistant coating for a pump and a preparation method of the corrosion-resistant coating. The corrosion-resistant coating for the pump is prepared from the following raw materials in parts by weight: 100 parts of epoxy resin, 50-60 parts of a polyamide curing agent, 3-5 parts of a flash-rust inhibitor, 0.5-1 part of a defoaming agent, 2-4 parts of a dispersing agent, 1-4 parts of modified nano silicon dioxide and 3-5 parts of disilane modified p-phenylenediborate, experiments prove that the prepared coating for the pump has excellent corrosion resistance, adhesive force and mechanical property, has relatively long service life in the field of water pumps, and can be widely applied to the field of water pumps.

Description

Technical Field

[0001] The present invention relates to the technical field of coatings, in particular to a corrosion-resistant pump coating and a preparation method thereof. Background Art

[0002] In modern industrial production and water resource management systems, water pumps, as key power equipment, undertake important functions such as liquid transportation, circulation, and pressure boosting. However, due to their long-term exposure to various water environments, including freshwater, seawater, industrial wastewater, and liquids containing chemicals, their metal components face severe corrosion challenges. Corrosion can increase surface roughness, change geometry, increase hydraulic losses, and reduce efficiency.

[0003] As the first line of defense for protecting water pump surfaces, the corrosion resistance of coatings is directly related to the pump's service life, operating efficiency, and maintenance costs. Epoxy resin coatings are commonly used for water pumps, offering excellent chemical stability and adhesion. However, these traditional epoxy resin coatings are currently unable to meet the demands of existing water pumps. Excellent corrosion resistance is essential for ensuring the long-term, reliable operation of water pump coatings. Therefore, the present invention provides a corrosion-resistant pump coating and a method for its preparation. Summary of the Invention

[0004] (1) Technical problems solved In view of the deficiencies in the prior art, the present invention provides a corrosion-resistant pump coating and a preparation method thereof. The prepared coating has good adhesion, corrosion resistance and mechanical properties.

[0005] (2) Technical solution A corrosion-resistant pump coating is composed of the following raw materials in parts by weight: 100 parts by weight of epoxy resin, 50-60 parts of polyamide curing agent, 3-5 parts of anti-flash rust agent, 0.5-1 part of defoaming agent, 2-4 parts of dispersant, 1-4 parts of modified nano-silica, and 3-5 parts of disilane-modified terephthalate.

[0006] Preferably, the preparation method of the modified nano-silica is: Step A1, adding 2-amino-1,3-propanediol and phosphorus oxychloride to a dichloromethane solvent, stirring and dispersing, heating to 30-35°C, and reacting at a constant temperature for 5-8 hours. After the reaction is completed, distilling under reduced pressure, and then adding a mixed solution of acetone and water with a volume ratio of 1:1, stirring for 12-15 hours, filtering, and drying. The obtained product is recorded as product A, wherein the mass ratio of 2-amino-1,3-propanediol and phosphorus oxychloride is 1:1.6-1.8. The reaction uses 2-amino-1,3-propanediol and phosphorus oxychloride as raw materials, undergoes phosphation reaction and hydrolysis reaction, and obtains product A. The reaction synthesis route is:

[0007] Step A2, adding product A and hexamethylene diisocyanate to a dichloromethane solvent, stirring evenly, then adding methanol thereto, maintaining a constant temperature of 20-30°C, reacting for 15-18 hours, filtering after completion of the reaction, washing with ethyl acetate, and drying. The obtained product is recorded as product B, wherein the mass ratio of product A to hexamethylene diisocyanate is 1:1-1.2. In this reaction, the amino group contained in product A and an isocyanate group in hexamethylene diisocyanate are used to carry out an addition reaction by controlling the dosage ratio to obtain product B. The reaction synthesis route is:

[0008] Step A3: Add product B and nano-silica to an acetone solvent, then add dibutyltin dilaurate thereto, and react at 50-55° C. for 3-6 hours. After the reaction, centrifuge, wash with acetone and deionized water in sequence, and dry. The resulting product is recorded as modified nano-silica, wherein the amount ratio of product B to nano-silica is 5-7:1. In this reaction, the isocyanate group is used as a bridge, which can not only connect the phosphate group and the nano-silica, but also disperse the nano-silica. The reaction synthesis route is:

[0009] In the present invention, unmodified nano-silica has poor compatibility with organic epoxy coatings and cannot be evenly distributed in the coating. After it is coated in a water pump and solidified, the electrolyte solution can easily penetrate the interface between the inorganic product and the organic coating, causing local corrosion. The modified nano-silica has good compatibility with the organic coating and can be evenly dispersed. The evenly dispersed nano-silica can prevent the corrosive medium from penetrating into the substrate, making the path of the corrosive medium penetrating into the metal surface of the pump become tortuous, thereby playing a good physical isolation role. Therefore, it has strong barrier properties and can improve the corrosion resistance of the coating.

[0010] In the present invention, the phosphate structure can form a strong chelate with the metal surface through its hydroxyl groups, forming a complex that tightly bonds the metal substrate and the polymer coating, greatly improving the adhesion of the emulsion to the metal substrate. The phosphate group forms a thin film on the metal substrate surface, hindering the erosion of corrosive media and forming a "surface-to-point" barrier network with nano-silica, extending the time of water-based corrosion attack and further enhancing the corrosion resistance of the coating. Preferably, the preparation method of the bissilane-modified terephthalate is: Step B1, adding 2-amino-1,3-propanediol and phenylenediboronic acid to dichloromethane, stirring and dispersing, then adding 4A activated molecular sieves thereto, stirring and reacting at room temperature for 10-15h under a nitrogen atmosphere, filtering and rotary evaporation after the reaction, and the obtained product is recorded as amino-modified terephthalate, wherein the mass ratio of 2-amino-1,3-propanediol and phenylenediboronic acid is 1.2-1.5:1. In this reaction, 2-amino-1,3-propanediol and phenylenediboronic acid are used as raw materials, and amino-modified terephthalate is prepared by esterification and dehydration. The reaction synthesis route is:

[0011] Step B2, adding chloropropyl triethoxysilane, amino-modified terephthalic acid ester, potassium carbonate, and potassium iodide to a toluene solvent, stirring and dispersing, purging with nitrogen under ice bath conditions for 3 times, and reacting at 75-85 ° C. under nitrogen protection for 20-25 hours. After the reaction is completed, filtering, rotary evaporation, and drying are performed. The obtained product is recorded as bis-silane-modified terephthalic acid ester, wherein the mass ratio of chloropropyl triethoxysilane, amino-modified terephthalic acid ester, potassium carbonate, and potassium iodide is 1.7-2:1:2.8-3.2:0.12-0.15. In this reaction, chloropropyl triethoxysilane and amino-modified terephthalic acid ester are used as raw materials, and a substitution reaction is performed to obtain bis-silane-modified terephthalic acid ester. The reaction synthesis route is:

[0012] In the present invention, the released silane undergoes a hydrolysis reaction with water molecules to generate Si-OH with higher activity. A portion of the Si-OH reacts with the metal on the pump surface to increase the adhesion of the substrate to the coating, generate a super-hydrophobic film on the substrate surface, and improve the corrosion resistance. A portion of the Si-OH condenses to form a Si-O-Si cross-linked film with low water adsorption capacity. This cross-linked film not only effectively blocks the diffusion of the electrolyte solution to the substrate and the coating, further improving the corrosion resistance, but also can form a dense silicon film layer on the surface of the micro-defects when the coating is damaged by external impact, thereby repairing the micro-defects of the coating. Another portion of the generated Si-OH undergoes a condensation reaction with the C-OH bond in the epoxy resin to generate a super-hydrophobic siloxane layer, which prevents the solution from further diffusing into the coating, thereby once again improving the corrosion resistance of the coating.

[0013] Preferably, the preparation method of the corrosion-resistant pump coating comprises the following steps: Add epoxy resin to a mixed solvent of n-butanol and toluene in a volume ratio of 1:1, stir and disperse, add anti-flash rust agent, defoamer, dispersant, modified nano-silica, and disilane-modified terephthalate and stir for 20-30 minutes, then add curing agent and mix evenly to obtain a corrosion-resistant pump coating.

[0014] (3) Beneficial technical effects The present invention prepares a modified nano-silica. On the one hand, the evenly dispersed nano-silica and the phosphate structure are used to form a "surface-point" barrier network, thereby extending the time of water-based corrosion attack and improving the corrosion resistance of the coating. On the other hand, when the coating is impacted by an external electrolyte solution, the nano-silica can not only disperse the impact energy and improve the mechanical properties of the coating, but also, when micro-defects are formed in the coating due to external impact, the nano-silica can migrate to the micro-defects and be deposited at the coating defects to repair the micro-defects, thereby hindering the penetration of the electrolyte solution, improving the self-repair effect of the coating, and thus increasing the service life of the coating.

[0015] The bissilane-modified terephthalate prepared by the present invention, the Si-OH with higher activity after hydrolysis can not only be chemically connected with the metal on the pump surface, but also form a film on the pump surface, blocking the diffusion of the electrolyte solution to the matrix and the coating, improving corrosion resistance, and the dense super-hydrophobic silane layer formed by the cross-linking reaction can not only repair the defective parts in the coating, effectively improve the self-repair effect, but also when the coating is impacted, disperse the impact force, improve the mechanical properties of the coating. In addition, the borate bond therein is also a kind of dynamic chemical covalent bond, when the coating is damaged by external impact, by the reversible fracture and reorganization of the borate bond, the purpose of repairing the coating is reached, to extend the service life of the pump coating.

[0016] The present invention prepares modified nano-silica and disilane-modified terephthalate, and by constructing a novel "surface-point" barrier network structure, prolongs the attack time of water-based corrosion factors. The structure is applied to pump coatings to improve the corrosion resistance, adhesion and mechanical properties of the pump coatings. DETAILED DESCRIPTION

[0017] In order to make the objectives, technical solutions and beneficial effects of the present invention more clear, preferred embodiments of the present invention will be described in detail below.

[0018] Example 1 (1) Add 10 g of 2-amino-1,3-propanediol and 16 g of phosphorus oxychloride to dichloromethane solvent, stir and disperse, heat to 35 °C, and react at constant temperature for 5 h. After the reaction is completed, distill under reduced pressure, and then add 100 mL of a mixed solution of acetone and water with a volume ratio of 1:1. Stir for 15 h, filter, and dry. The obtained product is recorded as product A.

[0019] (2) Add 10 g of product A and 11 g of hexamethylene diisocyanate to dichloromethane solvent, stir evenly, then add 15 mL of methanol, keep the temperature at 25 °C, and react for 16 h. After the reaction is completed, filter, wash with ethyl acetate, and dry. The obtained product is recorded as product B.

[0020] (3) 5 g of product B and 1 g of nano-silica were added to an acetone solvent, and then 6 drops of dibutyltin dilaurate were added thereto. The mixture was reacted at 55°C for 5 h. After the reaction was completed, the mixture was centrifuged, washed with acetone and deionized water in turn, and dried. The obtained product was recorded as modified nano-silica.

[0021] (4) 8 g of 2-amino-1,3-propanediol and 6 g of phenylenediboronic acid were added to dichloromethane and stirred to disperse. 37 g of 4A activated molecular sieves were then added thereto. The mixture was stirred at room temperature under a nitrogen atmosphere for 14 h. After the reaction was completed, the mixture was filtered and rotary evaporated. The obtained product was recorded as amino-modified phenylenediboronic acid ester.

[0022] (5) Add 10 g of chloropropyltriethoxysilane, 5 g of amino-modified terephthalodiborate, 15 g of potassium carbonate, and 0.7 g of potassium iodide to toluene solvent, stir and disperse, and expel oxygen three times with nitrogen in an ice bath. Under nitrogen protection, react at 85 ° C for 20 h. After the reaction is completed, filter, rotary evaporate, and dry. The obtained product is recorded as disilane-modified terephthalodiborate.

[0023] (6) Add 100 g of epoxy resin E-41 to a mixed solvent of n-butanol and toluene with a volume ratio of 1:1, stir and disperse, add 3 g of anti-flash rust agent FA-179, 1 g of defoamer BYK-022, 3 g of dispersant BYK-163, 1 g of modified nano-silica, and 3 g of disilane-modified terephthalate and stir for 20 minutes, then add 60 g of polyamide curing agent and mix evenly to obtain a corrosion-resistant pump coating.

[0024] Example 2 (1) Add 10 g of 2-amino-1,3-propanediol and 17 g of phosphorus oxychloride to dichloromethane solvent, stir and disperse, heat to 35 °C, and react at constant temperature for 6 h. After the reaction is completed, distill under reduced pressure, and then add 100 mL of a mixed solution of acetone and water with a volume ratio of 1:1. Stir for 14 h, filter, and dry. The obtained product is recorded as product A.

[0025] (2) Add 10 g of product A and 12 g of hexamethylene diisocyanate to dichloromethane solvent, stir evenly, then add 15 mL of methanol, keep the temperature at 20 °C, and react for 18 h. After the reaction is completed, filter, wash with ethyl acetate, and dry. The obtained product is recorded as product B.

[0026] (3) 7 g of product B and 1 g of nano-silica were added to an acetone solvent, and then 6 drops of dibutyltin dilaurate were added thereto. The mixture was reacted at 50 °C for 6 h. After the reaction was completed, the mixture was centrifuged, washed with acetone and deionized water in turn, and dried. The obtained product was recorded as modified nano-silica.

[0027] (4) 8 g of 2-amino-1,3-propanediol and 6 g of phenylenediboronic acid were added to dichloromethane and stirred to disperse. 37 g of 4A activated molecular sieves were then added thereto. The mixture was stirred at room temperature under a nitrogen atmosphere for 12 h. After the reaction was completed, the mixture was filtered and rotary evaporated. The obtained product was recorded as amino-modified phenylenediboronic acid ester.

[0028] (5) Add 10 g of chloropropyltriethoxysilane, 5 g of amino-modified terephthalodiborate, 16 g of potassium carbonate, and 0.75 g of potassium iodide to toluene solvent, stir and disperse, and expel oxygen three times with nitrogen in an ice bath. Under nitrogen protection, react at 85°C for 20 h. After the reaction is completed, filter, rotary evaporate, and dry. The obtained product is recorded as disilane-modified terephthalodiborate.

[0029] (6) Add 100 g of epoxy resin E-41 to a mixed solvent of n-butanol and toluene with a volume ratio of 1:1, stir and disperse, add 5 g of FA-179 anti-flash rust agent, 0.5 g of defoamer BYK-022, 4 g of dispersant BYK-163, 2 g of modified nano-silica, and 3.5 g of disilane-modified terephthalate and stir for 25 minutes, then add 50 g of polyamide curing agent and mix well to obtain a corrosion-resistant pump coating.

[0030] Example 3 (1) Add 10 g of 2-amino-1,3-propanediol and 17 g of phosphorus oxychloride to dichloromethane solvent, stir and disperse, heat to 30 °C, and react at constant temperature for 8 h. After the reaction is completed, distill under reduced pressure, and then add 100 mL of a mixed solution of acetone and water with a volume ratio of 1:1. Stir for 12 h, filter, and dry. The obtained product is recorded as product A.

[0031] (2) Add 10 g of product A and 10 g of hexamethylene diisocyanate to dichloromethane solvent, stir evenly, then add 15 mL of methanol, keep the temperature at 30 °C, and react for 15 h. After the reaction is completed, filter, wash with ethyl acetate, and dry. The obtained product is recorded as product B.

[0032] (3) 6 g of product B and 1 g of nano-silica were added to an acetone solvent, and then 6 drops of dibutyltin dilaurate were added thereto. The mixture was reacted at 50°C for 3 h. After the reaction was completed, the mixture was centrifuged, washed with acetone and deionized water in turn, and dried. The obtained product was recorded as modified nano-silica.

[0033] (4) 9 g of 2-amino-1,3-propanediol and 6 g of phenylenediboronic acid were added to dichloromethane and stirred to disperse. 37 g of 4A activated molecular sieves were then added thereto. The mixture was stirred at room temperature under a nitrogen atmosphere for 10 h. After the reaction was completed, the mixture was filtered and rotary evaporated. The obtained product was recorded as amino-modified phenylenediboronic acid ester.

[0034] (5) 9 g of chloropropyltriethoxysilane, 5 g of amino-modified terephthalodiborate, 15 g of potassium carbonate, and 0.7 g of potassium iodide were added to a toluene solvent, stirred and dispersed, and nitrogen was bubbled through the solution for three times under ice bath conditions. The mixture was reacted at 75°C for 25 h under nitrogen protection. After the reaction was completed, the mixture was filtered, rotary evaporated, and dried. The obtained product was recorded as disilane-modified terephthalodiborate.

[0035] (6) Add 100 g of epoxy resin E-41 to a mixed solvent of n-butanol and toluene with a volume ratio of 1:1, stir and disperse, add 4 g of FA-179 anti-flash rust agent, 1 g of defoamer BYK-022, 2 g of dispersant BYK-163, 3 g of modified nano-silica, and 4 g of disilane-modified terephthalate and stir for 30 minutes, then add 55 g of polyamide curing agent and mix evenly to obtain a corrosion-resistant pump coating.

[0036] Example 4 (1) Add 10 g of 2-amino-1,3-propanediol and 18 g of phosphorus oxychloride to dichloromethane solvent, stir and disperse, heat to 30 °C, and react at constant temperature for 6 h. After the reaction is completed, distill under reduced pressure, and then add 100 mL of a mixed solution of acetone and water with a volume ratio of 1:1. Stir for 14 h, filter, and dry. The obtained product is recorded as product A.

[0037] (2) Add 10 g of product A and 11 g of hexamethylene diisocyanate to dichloromethane solvent, stir evenly, then add 15 mL of methanol, keep the temperature at 25 °C, and react for 16 h. After the reaction is completed, filter, wash with ethyl acetate, and dry. The obtained product is recorded as product B.

[0038] (3) 6 g of product B and 1 g of nano-silica were added to an acetone solvent, and then 6 drops of dibutyltin dilaurate were added thereto. The mixture was reacted at 50°C for 5 h. After the reaction was completed, the mixture was centrifuged, washed with acetone and deionized water in turn, and dried. The obtained product was recorded as modified nano-silica.

[0039] (4) 7.2 g of 2-amino-1,3-propanediol and 6 g of phenylenediboronic acid were added to dichloromethane and stirred to disperse. 37 g of 4A activated molecular sieves were then added thereto. The mixture was stirred at room temperature under a nitrogen atmosphere for 15 h. After the reaction was completed, the mixture was filtered and rotary evaporated. The obtained product was recorded as amino-modified phenylenediboronic acid ester.

[0040] (5) 8.5 g of chloropropyltriethoxysilane, 5 g of amino-modified terephthalodiborate, 14 g of potassium carbonate, and 0.6 g of potassium iodide were added to a toluene solvent, stirred and dispersed, and nitrogen was bubbled through the solution for three times under ice bath conditions. The mixture was reacted at 80°C for 24 h under nitrogen protection. After the reaction was completed, the mixture was filtered, rotary evaporated, and dried. The obtained product was recorded as disilane-modified terephthalodiborate.

[0041] (6) Add 100 g of epoxy resin E-41 to a mixed solvent of n-butanol and toluene with a volume ratio of 1:1, stir and disperse, add 4 g of FA-179 anti-flash rust agent, 0.8 g of defoamer BYK-022, 3 g of dispersant BYK-163, 4 g of modified nano-silica, and 5 g of disilane-modified terephthalate and stir for 25 minutes, then add 60 g of polyamide curing agent and mix well to obtain a corrosion-resistant pump coating.

[0042] Comparative Example 1 The steps for preparing the pump coating of the present invention are substantially the same as those of Example 1, with the difference being that modified nano-silica is not contained in step (6).

[0043] Comparative Example 2 The steps for preparing the pump coating of the present invention are substantially the same as those of Example 1, with the difference that, in step (6), no disilane-modified terephthalate is contained.

[0044] The prepared coating is applied on a steel plate and dried and cured.

[0045] Corrosion resistance test: Prepare 5% sodium hydroxide aqueous solution, 5% sulfuric acid solution, and 5% sodium chloride aqueous solution, soak the sample in them for 1200 hours, and observe whether the sample has bubbles, rust spots, or shedding.

[0046] Table 1: Acid resistance Alkali resistance Example 1 No change No change Example 2 No change No change Example 3 No change No change Example 4 No change No change Comparative Example 1 Bubbling, no shedding No blistering or rust spots Comparative Example 2 Bubbling, no shedding No blistering or rust spots Comparative Example 3 Blistering and shedding Blisters and rust spots Comparative Example 3 is a commercially available epoxy resin coating.

[0047] As can be seen from the table, the pump coating prepared by the present invention has better corrosion resistance than a commercially available epoxy resin coating. The acid and alkali resistance of Examples 1-4 is better than that of Comparative Example 1-2. Examples 1-4 contain modified nano-silica and disilane-modified terephthalate diborates at the same time. The modified nano-silica can be evenly dispersed in the material and has good anti-penetration performance. Therefore, it can effectively block the penetration of corrosive media into the metal substrate, thereby extending the contact time between the corrosive media and the metal substrate, thereby having better corrosion resistance. Modified nano-silica and disilane-modified terephthalate diborates can form a thin film on the surface of the substrate, which can effectively block the diffusion of the electrolyte solution into the substrate and the coating, thereby improving the corrosion resistance. In addition, the benzene ring structure therein, as a rigid structure, can increase the compactness of the molecular chain spacing, hinder the penetration of the corrosive media, and further improve the corrosion resistance.

[0048] Adhesion test: refer to GB / T9286-2021, test, level 0 is the best and level 5 is the worst.

[0049] The mechanical properties of the coatings were tested using a paint film impactor.

[0050] Table 2: Adhesion / Grade Impact strength / (kg·cm) Example 1 1 27.7 Example 2 0 29.6 Example 3 0 33.4 Example 4 0 32.8 Comparative Example 1 2 23.6 Comparative Example 2 3 25.0 As can be seen from the table, the adhesion and mechanical properties of Examples 1-4 are better than those of Comparative Examples 1-2, and the mechanical properties of Comparative Example 2 are better than those of Comparative Example 1. This is because Comparative Example 2 contains modified nano-silica, and when the rigid particles are added to the epoxy resin system and are evenly dispersed, it is beneficial to the transmission of stress and consumes the impact energy required for the stress transmission process, thereby having the effect of toughening the epoxy resin; in addition, the nanoparticles have a small particle size, which well compensates for the gaps generated when the coating is cured, and can concentrate stress while transmitting stress. When the coating is subjected to external impact, an induction effect occurs between the nanoparticles added to the coating and the resin interface, thereby causing the resin near the particles to yield, forming many The appearance of cracks, holes, etc. requires a large amount of deformation work, thus consuming a large amount of energy. At the same time, the nanoparticles dispersed in the resin form a pinning effect with the resin, which effectively hinders and passivates the expansion of cracks to a certain extent. Therefore, the mechanical properties of Comparative Example 2 are better than those of Comparative Example 1, but the adhesion of Comparative Example 2 is not as good as that of Comparative Example 1. This is because Comparative Example 1 contains disilane-modified terephthalodiborate, and its content is higher than that of the modified nano-silica in Comparative Example 2. In addition to the rigid benzene ring structure therein being able to absorb impact energy, the cross-linked film generated by the hydrolysis and cross-linking of the disilane structure therein can also absorb impact energy. Therefore, the adhesion of Comparative Example 1 is better than that of Comparative Example 2. Examples 1-4, which contain both modified nano-silica and disilane-modified terephthalodiborate, are better than Comparative Examples 1-2.

[0051] In summary, the pump coating prepared by the present invention has excellent corrosion resistance, adhesion and mechanical properties, has a long service life in the field of water pumps, and can be widely used in the field of water pumps.

[0052] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A corrosion-resistant pump coating, characterized in that: The corrosion-resistant pump coating is composed of the following raw materials in parts by weight: 100 parts by weight of epoxy resin, 50-60 parts of polyamide curing agent, 3-5 parts of anti-flash rust agent, 0.5-1 part of defoaming agent, 2-4 parts of dispersant, 1-4 parts of modified nano-silica, and 3-5 parts of disilane-modified terephthalate.

2. The corrosion-resistant pump coating according to claim 1, characterized in that: The preparation method of the modified nano-silica is: Step A1, adding 2-amino-1,3-propanediol and phosphorus oxychloride to a dichloromethane solvent, stirring and dispersing, heating to 30-35°C, and reacting at this temperature for 5-8 hours. After the reaction is completed, distilling under reduced pressure, and then adding a mixed solution of acetone and water in a volume ratio of 1:1, stirring for 12-15 hours, filtering, and drying. The obtained product is recorded as product A; Step A2, adding product A and hexamethylene diisocyanate to dichloromethane solvent, stirring evenly, then adding methanol, maintaining the temperature at 20-30°C, reacting for 15-18 hours. After the reaction is complete, filtering, washing with ethyl acetate, and drying. The obtained product is recorded as product B; Step A3: Add product B and nano-silica to acetone solvent, then add dibutyltin dilaurate, and react at 50-55° C. for 3-6 hours. After the reaction is completed, centrifuge, wash with acetone and deionized water in sequence, and dry. The obtained product is recorded as modified nano-silica.

3. The corrosion-resistant pump coating according to claim 2, characterized in that: In the step A1, the mass ratio of 2-amino-1,3-propanediol to phosphorus oxychloride is 1:1.6-1.

8.

4. The corrosion-resistant pump coating according to claim 2, characterized in that: In the step A2, the mass ratio of product A to hexamethylene diisocyanate is 1:1-1.

2.

5. The corrosion-resistant pump coating according to claim 2, characterized in that: In step A3, the usage ratio of product B and nano-silicon dioxide is 5-7:

1.

6. The corrosion-resistant pump coating according to claim 1, characterized in that: The preparation method of the bissilane-modified terephthalate borate is as follows: Step B1, adding 2-amino-1,3-propanediol and phenylenediboronic acid to dichloromethane, stirring and dispersing, then adding 4A activated molecular sieves thereto, stirring and reacting at room temperature under a nitrogen atmosphere for 10-15 hours. After the reaction is completed, filtering, rotary evaporation, and the obtained product is recorded as amino-modified terephthalic diboronate; Step B2: Add chloropropyltriethoxysilane, amino-modified terephthalodiborate, potassium carbonate, and potassium iodide to toluene solvent, stir and disperse, and deoxygenate three times with nitrogen in an ice bath. Under nitrogen protection, react at 75-85° C. for 20-25 hours. After the reaction is completed, filter, rotary evaporate, and dry. The obtained product is recorded as bissilane-modified terephthalodiborate.

7. The corrosion-resistant pump coating according to claim 6, characterized in that: In the step B1, the mass ratio of 2-amino-1,3-propanediol to phenylenediboronic acid is 1.2-1.5:

1.

8. The corrosion-resistant pump coating according to claim 6, characterized in that: In the step B2, The mass ratio of chloropropyltriethoxysilane, amino-modified terephthalic diborate, potassium carbonate and potassium iodide is 1.7-2:1:2.8-3.2:0.12-0.

15.

9. A corrosion-resistant pump coating according to any one of claims 1 to 8, characterized in that: The preparation method of the corrosion-resistant pump coating comprises the following steps: Add epoxy resin to a mixed solvent of n-butanol and toluene in a volume ratio of 1:1, stir and disperse, add anti-flash rust agent, defoamer, dispersant, modified nano-silica, and disilane-modified terephthalate and stir for 20-30 minutes, then add curing agent and mix evenly to obtain a corrosion-resistant pump coating.

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