An anticorrosive carbon nano polymer coating for petroleum pipelines and a preparation method and application thereof

Abstract

The application belongs to the technical field of pipeline coating, and specifically provides a petroleum pipeline anticorrosive carbon nano polymer coating, a preparation method and application thereof, and the preparation method of the petroleum pipeline anticorrosive carbon nano polymer coating is prepared by mixing raw materials including the following components by mass fraction: base resin 80-90 parts, microcapsule 8-12 parts, carbon nanotube 1-5 parts, talcum powder 0.5-2 parts, anticorrosive agent 0.5-1 part, defoaming agent 0.1-0.5 part, and leveling agent 0.2-0.3 part. The microcapsule prepared in the application is used as a coating raw material component, can repair coating cracks, and realizes long-acting protection of the inner layer metal of the pipeline.

Description

Technical Field

[0001] This application belongs to the field of pipeline coating technology, and in particular relates to an anti-corrosion carbon nanopolymer coating for oil pipelines, its preparation method, and its application. Background Technology

[0002] Oil pipelines, as core infrastructure for energy transportation, are widely used for long-distance transport of crude oil, refined oil, and natural gas. These pipelines are typically buried underground, operating in complex geological environments and subject to various factors such as soil stress, humidity variations, chemical corrosion, and microbial activity. To ensure the long-term stable operation of pipelines in humid, high-pressure, and corrosive environments, their outer surfaces must be protected with coatings. Applying high-performance coating materials is a key technical means to prevent pipeline corrosion and extend their service life.

[0003] Currently, commonly used coating materials for oil pipelines mostly use epoxy resin, phenolic resin, or a composite system of both as the base resin. These resins are widely used due to their excellent adhesion, chemical resistance, and mechanical strength. However, because their molecular chains are rich in rigid benzene ring structures, these resins often exhibit high brittleness after curing. In practical applications, when buried pipelines are subjected to external stresses such as geological movements, the coating is prone to developing microcracks. These cracks not only damage the integrity of the coating but also provide a penetration path for moisture, electrolytes, and corrosive media, ultimately leading to localized corrosion of the pipeline's metal substrate and threatening the safety of the entire transportation system. To address the problem of protective failure after coating cracking, the industry has gradually developed self-healing solutions based on microcapsule technology. The core idea is to incorporate microcapsules with isocyanate as the core repair component during the coating preparation stage. When the coating cracks, the mechanical force generated during crack propagation will destroy the shell structure of the microcapsules. The isocyanate repair agent encapsulated inside will be released into the crack gaps through dissolution. Under the humid conditions of the buried pipeline environment, the isocyanate can react with water molecules to form a polymer with adhesive properties, thereby sealing and repairing the cracks and restoring the protective function of the coating.

[0004] However, traditional isocyanate microcapsules are typically encapsulated in polyurea shells, which have limited water-blocking properties. Water molecules can still slowly penetrate into the microcapsule interior, causing the isocyanate to solidify and fail prematurely. Furthermore, isocyanates are prone to gelation in humid environments, leading to a rapid increase in system viscosity and reduced fluidity, making it difficult to fully penetrate deep into cracks, resulting in incomplete repair and leaving the pipe substrate still at risk of corrosion. Therefore, there is a need to find a carbon nanopolymer coating and its preparation method that can improve the wetting and repair effect of microcapsules and the hydrophobicity of the microcapsule shell. Summary of the Invention

[0005] To address the aforementioned issues and further improve the wetting and repair effect of microcapsules while enhancing the hydrophobicity of the polyurea shell of the microcapsules, this application provides an anti-corrosion carbon nanopolymer coating for oil pipelines, its preparation method, and its application.

[0006] This application first provides a method for preparing an anti-corrosion carbon nanotube polymer coating for oil pipelines, which is prepared by mixing raw materials comprising the following parts by weight: 80-90 parts of base resin, 8-12 parts of microcapsules, 1-5 parts of carbon nanotubes, 0.5-2 parts of talc, 0.5-1 parts of preservative, 0.1-0.5 parts of defoamer, and 0.2-0.3 parts of leveling agent;

[0007] The microcapsule preparation steps include the following:

[0008] S01. Take water and ethanol, mix them, add emulsifier, heat and stir to obtain solution A;

[0009] S02. Fluorouracil, propylene carbonate and isophorone diisocyanate were mixed and stirred, and then dispersed with ethyl acetate to obtain solution B;

[0010] S03. Take liquid B and liquid A, adjust the water-oil ratio to (20-30):1, emulsify by high-speed shearing, then add an interface agent to catalyze the reaction, then let it stand and age, and then wash it with water 2-3 times after centrifugation and filtration.

[0011] In step S02, the mass-to-volume ratio of fluorouracil, propylene carbonate, isophorone diisocyanate and ethyl acetate is (0.2-0.3)g:(0.6-0.7)g:(7-8)g:(8.5-9.2)mL.

[0012] By employing the above technical solution, the microcapsules use isophorone diisocyanate as the main component of the core material repair solution, and a polyurea structure generated by the reaction of isophorone diisocyanate with water under catalytic conditions as the shell material, obtained through an "oil-in-water" emulsification reaction. When the microcapsules rupture, the isophorone diisocyanate in the core material is released, wetting the cracks in the coating, and reacting with water molecules in the humid environment of the coating, thus solidifying to form a repair layer. The fluorouracil and propylene carbonate added to the core material have a synergistic effect: the partially positively charged carbon atoms in the isocyanate are attracted by the lone pairs of electrons on the carbonyl oxygen atoms of propylene carbonate and fluorouracil, forming a weak and reversible coordination structure, thereby to some extent preventing water molecules from directly reacting with the isocyanate. Simultaneously, fluorouracil can bind water molecules through hydrogen bonding, further delaying the process of water molecules participating in the reaction. The synergistic effect between the components delays the gelation reaction point of isophorone diisocyanate and water, helping the repair components to achieve more complete wetting in the cracks.

[0013] Furthermore, the base resin is composed of 75%-80% phenolic resin and 20%-25% epoxy resin by mass.

[0014] Furthermore, the preservative is at least one of organic acid salt preservatives and isothiazolinone preservatives.

[0015] Furthermore, in step S01, the mass-volume ratio of water, ethanol and emulsifier is (100-150) mL:(30-50) mL:(0.3-2) g.

[0016] Furthermore, the emulsifier is at least one selected from gum arabic, Tween-20, and polyethylene glycol castor oil ester.

[0017] Furthermore, in step S03, the high-speed shear emulsification setting is an emulsification shear speed of 10000-15000 rpm.

[0018] Furthermore, in step S03, the interface agent includes phosphatidylcholine and laurylamine.

[0019] By employing the above technical solution, phosphatidylcholine and reactive laurylamine can spontaneously disperse at the oil-water interface during oil-in-water emulsification. In the subsequent catalytic reaction stage, some of the long-chain fatty alkane interacts with the oil phase and is anchored to the forming polyurea solidified shell. The extended portion still exhibits hydrophobicity, forming a hydrophobic barrier. This barrier adheres to the surface of the microcapsule shell, effectively preventing moisture erosion and thus preventing the microcapsules from failing due to water intrusion.

[0020] Furthermore, in step S03, the catalyst is one of dibutyltin dilaurate, dimethylcyclohexylamine, and triethylenediamine.

[0021] This application also provides a carbon nanoparticle polymer coating for corrosion protection of oil pipelines, which is prepared by the above-described method.

[0022] This application also provides the application of the anti-corrosion carbon nanopolymer coating for oil pipelines prepared by the above method in oil pipelines.

[0023] Compared with the prior art, this application has the following beneficial effects:

[0024] 1. This application introduces propylene carbonate and fluorouracil into the microcapsule core material. Through synergistic effect, they form a reversible coordination structure with the isocyanate bond of isophorone diisocyanate, which blocks water molecules from contacting isophorone diisocyanate and delays the curing reaction and gelation process, allowing the repair liquid to penetrate fully to the crack tip for a longer time, thereby enhancing the coating repair effect.

[0025] 2. In the microcapsule preparation process of this application, an interface agent containing aliphatic long chains is added to the water-oil emulsion, causing it to spontaneously arrange itself at the oil-water interface. During the catalytic reaction stage, some of the long-chain structures on the interface agent are fixed in the polyurea shell formed by the reaction of isophorone diisocyanate and water due to entanglement with the oil phase, while the extended long chains can form a water-blocking barrier on the surface of the microcapsule. By constructing a water-blocking system through internal and external synergy, the influence of the humid environment on the stability of the microcapsule is suppressed, giving the microcapsule a longer-lasting repair capability. Attached Figure Description

[0026] Figure 1 The graphs show the viscosity of the test solution in Example 2 and Comparative Example 1 of this application as a function of time. Detailed Implementation

[0027] To make the inventive objectives, technical solutions, and beneficial effects of this application clearer, the following detailed description is provided in conjunction with embodiments. Obviously, the described embodiments are merely some, not all, of the embodiments described herein. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0029] When using “including,” “having,” and “contains” as described herein, the intention is to cover non-exclusive inclusion, unless an explicit qualifying term such as “only,” “consisting of,” etc., is used, in which case another component may be added.

[0030] The terms "preferred," "more preferably," "better," and "even better" used in this application refer to embodiments of this application that provide certain beneficial effects under certain circumstances. However, other embodiments may also be preferred under the same or other circumstances. Furthermore, the description of one or more preferred embodiments does not imply that other embodiments are unavailable, nor is it intended to exclude other embodiments from the scope of this application. That is, in this application, "preferred," "more preferably," "better," and "even better" are merely descriptions of implementations or embodiments with better effects, but do not constitute a limitation on the scope of protection of this application.

[0031] In this application, terms such as "further," "even more," and "particularly" are used for descriptive purposes and indicate differences in content, but should not be construed as limiting the scope of protection of this application.

[0032] In this application, "at least one" means one or more, such as one, two, or more. "Multiple" or "several" means at least two, such as two, three, etc., and "multi-layered" means at least two layers, such as two layers, three layers, etc., unless otherwise explicitly specified. In the description of this application, "several" means at least one, such as one, two, etc., unless otherwise explicitly specified.

[0033] When a numerical range is disclosed herein, the range is considered continuous and includes the minimum and maximum values ​​of the range, as well as every value between the minimum and maximum values. Furthermore, when the range refers to integers, it includes every integer between the minimum and maximum values ​​of the range. Additionally, when multiple ranges are provided to describe a feature or characteristic, the ranges may be combined. In other words, unless otherwise specified, all ranges disclosed herein should be understood to include any and all subranges to which they are incorporated.

[0034] Unless otherwise specified, all steps in this application may be performed sequentially or randomly. For example, the method comprising steps (a) and (b) indicates that the method may include steps (a) and (b) performed sequentially, or it may include steps (b) and (a) performed sequentially. For example, the mention that the method may also include step (c) indicates that step (c) may be added to the method in any order; for example, the method may include steps (a), (b), and (c), or it may include steps (a), (c), and (b), or it may include steps (c), (a), and (b), etc. Unless otherwise stated, singular terms may include plural forms and should not be construed as having a quantity of one.

[0035] In this application, "above" or "below" includes the number itself. For example, "below 1" includes 1.

[0036] In this application, room temperature refers to 0~40℃, including but not limited to 10~40℃, or further to 20~30℃.

[0037] The present application will be further illustrated by the following examples, but these examples do not limit the scope of the present application.

[0038] When numerical ranges are given in the embodiments, it should be understood that, unless otherwise stated in this application, both endpoints of each numerical range and any value between the two endpoints may be selected. Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall apply. All reagents or instruments whose manufacturers are not specified are conventional products that can be purchased commercially. In addition to the specific methods, equipment, and materials used in the embodiments, based on the knowledge of the prior art possessed by one of ordinary skill in the art and the description in this application, any prior art methods, equipment, and materials similar to or equivalent to those described, used, or made by the methods, equipment, and materials in the embodiments of this application may be used to implement this application.

[0039] Preparation Example 1

[0040] Aqueous phase: Mix 100 mL of deionized water with 30 mL of anhydrous ethanol, stir at 200 rpm for 2 min, then add 0.3 g of Tween-20, and continue stirring at 40 °C for 10 min to obtain solution A for later use.

[0041] Oil phase: Mix 0.2g of fluorouracil (5-FU) with 0.6g of propylene carbonate, stir and disperse at 100rpm for 1min, then add 7g of isophorone diisocyanate (viscosity: 22mPa·s) and 8.5mL of ethyl acetate, and disperse thoroughly to obtain solution B for later use.

[0042] Preparation Example 2

[0043] Aqueous phase: Mix 120 mL of deionized water with 35 mL of anhydrous ethanol, stir at 200 rpm for 2 min, then add 2 g of gum arabic, and continue stirring at 45 °C for 20 min to obtain solution A for later use.

[0044] Oil phase: Mix 0.25g of fluorouracil (5-FU) with 0.6g of propylene carbonate, stir and disperse at 250rpm for 1min, then add 7.2g of isophorone diisocyanate (viscosity: 24.2mPa·s) and 8.7mL of ethyl acetate, and disperse thoroughly to obtain solution B for later use.

[0045] Preparation Example 3

[0046] Aqueous phase: Mix 150 mL of deionized water with 50 mL of anhydrous ethanol, stir at 300 rpm for 5 min, then add 1.7 g of polyethylene glycol castor oil ester EL-30, and continue stirring at 45 °C for 20 min to obtain solution A for later use.

[0047] Oil phase: Mix 0.3g of fluorouracil (5-FU) with 0.7g of propylene carbonate, stir and disperse at 250rpm for 2min, then add 8g of isophorone diisocyanate (viscosity: 35mPa·s) and 9.2mL of ethyl acetate, and disperse thoroughly to obtain solution B for later use.

[0048] Example 1

[0049] The specific steps for preparing the carbon nanoparticle polymer coating in this embodiment are as follows:

[0050] Add 600g of phenolic resin and 200g of epoxy resin to the main mixing container, and stir at 500rpm for 10min using a high-speed disperser to prepare the base resin. Then, take out 1 / 5 of the total mass of the base resin and 10g of carbon nanotubes (specific surface area 240g / m²). 2 After mixing, grind for 30 minutes, then mix with the remaining base resin and stir at 1000 rpm for 15 minutes. Then add 5g talc, 80g microcapsules, 2g polyether-modified polydimethylsiloxane leveling agent, 1g NXZ defoamer and 5g sodium dehydroacetate to the system. Adjust the stirring speed to 500 rpm and stir for 20 minutes. Finally, let it stand and mature for 1 hour to obtain the carbon nanopolymer coating.

[0051] The specific steps for preparing the microcapsules in this embodiment are as follows:

[0052] Mix solution A and solution B, adjust the water-to-oil ratio to 25:1, emulsify at a high-speed shear rate of 10000 rpm for 10 min, then add 0.2 g phosphatidylcholine and 0.1 g laurylamine, reduce the stirring speed to 100 rpm, add 0.02 g dibutyltin dilaurate catalyst, adjust the temperature to 50℃, and catalyze the reaction for 0.5 h. Then stop heating and stirring, let stand and age for 30 min, then centrifuge and filter to separate the aqueous phase, wash the precipitate twice with water to obtain microcapsules.

[0053] In this embodiment, liquid A and liquid B were prepared in Preparation Example 1.

[0054] Example 2

[0055] The specific steps for preparing the carbon nanoparticle polymer coating in this embodiment are as follows:

[0056] Add 650g of phenolic resin and 200g of epoxy resin to the main mixing container, and stir at 500rpm for 12min using a high-speed disperser to prepare the base resin. Then, take out 1 / 5 of the total mass of the base resin and 25g of carbon nanotubes (specific surface area 240g / m²). 2After mixing, grind for 45 minutes, then mix with the remaining base resin and stir at 1000 rpm for 15 minutes. Then add 15g talc, 100g microcapsules, 3g polyether-modified polydimethylsiloxane leveling agent, 5g NXZ defoamer and 10g benzisothiazolinone to the system. Adjust the stirring speed to 600 rpm and stir for 20 minutes. Finally, let it stand and mature for 1.5 hours to obtain carbon nanopolymer coating.

[0057] The specific steps for preparing the microcapsules in this embodiment are as follows:

[0058] Mix solution A and solution B, adjust the water-to-oil ratio to 28:1, emulsify at a high-speed shear rate of 12000 rpm for 15 min, then add 0.4 g phosphatidylcholine and 0.15 g laurylamine, reduce the stirring speed to 100 rpm, add 0.03 g dimethylcyclohexylamine catalyst, adjust the temperature to 52℃, and catalyze the reaction for 0.8 h. Then stop heating and stirring, let stand and age for 40 min, then centrifuge and filter to separate the aqueous phase, wash the precipitate three times with water to obtain microcapsules.

[0059] In this embodiment, liquid A and liquid B were prepared in Preparation Example 2.

[0060] Example 3

[0061] The specific steps for preparing the carbon nanoparticle polymer coating in this embodiment are as follows:

[0062] Add 720g of phenolic resin and 180g of epoxy resin to the main mixing container, and stir at 500rpm for 15min using a high-speed disperser to prepare the base resin. Then, take out 1 / 5 of the total mass of the base resin and 50g of carbon nanotubes (specific surface area 240g / m²). 2 After mixing, grind for 45 minutes, then mix with the remaining base resin and stir at 1500 rpm for 20 minutes. Then add 20g talc, 120g microcapsules, 3g polyether-modified polydimethylsiloxane leveling agent, 5g NXZ defoamer and 10g benzisothiazolinone to the system. Adjust the stirring speed to 800 rpm and stir for 30 minutes. Finally, let it stand and mature for 2 hours to obtain carbon nanopolymer coating.

[0063] The specific steps for preparing the microcapsules in this embodiment are as follows:

[0064] Mix solution A and solution B, adjust the water-to-oil ratio to 30:1, emulsify at a high-speed shear rate of 15000 rpm for 15 min, then add 0.5 g phosphatidylcholine and 0.15 g laurylamine, reduce the stirring speed to 200 rpm, add 0.04 g triethylenediamine catalyst, adjust the temperature to 55℃, and catalyze the reaction for 1 h. Then stop heating and stirring, let stand and age for 40 min, then centrifuge and filter to separate the aqueous phase, wash the precipitate three times with water to obtain microcapsules.

[0065] In this embodiment, liquid A and liquid B were prepared in Preparation Example 3.

[0066] Comparative Example 1

[0067] The difference between this comparative example and Example 1 is that the preparation steps of solution B used in the microcapsule preparation process are as follows:

[0068] Take 7.5g of isophorone diisocyanate (viscosity: 22mPa·s) and 8.5mL of ethyl acetate, disperse them thoroughly to obtain solution B for later use.

[0069] The remaining steps are the same as in Example 1.

[0070] Comparative Example 2

[0071] The difference between this comparative example and Example 1 is that the preparation steps of the microcapsules are as follows:

[0072] Mix solution A and solution B, adjust the water-oil ratio to 25:1, emulsify at a high-speed shear rate of 10000 rpm for 10 min, reduce the stirring speed to 100 rpm, add 0.02 g of catalyst dibutyltin dilaurate, adjust the temperature to 50℃, and catalyze the reaction for 0.5 h. Then stop heating and stirring, let stand and age for 30 min, then centrifuge and filter to separate the aqueous phase, wash the precipitate twice with water to obtain microcapsules.

[0073] The remaining steps are the same as in Example 1.

[0074] Performance testing

[0075] 1. Apparent performance test

[0076] The apparent performance test items of the carbon nanopolymer coatings of Examples 1-3 and Comparative Examples 1-2 are shown in Table 1.

[0077] Table 1. Test items for apparent properties of carbon nanotube polymer coatings in Examples 1-3 and Comparative Examples 1-2

[0078]

[0079] The test results are shown in Table 2.

[0080] Table 2. Apparent performance test results of carbon nanopolymer coatings in Examples 1-3 and Comparative Examples 1-2

[0081]

[0082] By comparing Examples 1-3 and Comparative Examples 1-2 with Tables 1 and 2, it can be concluded that the coatings prepared using the methods in the examples all have apparent properties within the internal control range, and the apparent properties of the coatings are better than those of the comparative examples. In terms of corrosion resistance, the coatings in the examples have higher acid and alkali resistance, and applying the coatings to oil pipelines can provide longer protection for metal pipelines. However, the microcracks caused by surface cracking in the coatings of the comparative examples are difficult to fully repair under the test environment, resulting in varying degrees of reduction in the acid and alkali resistance of the coatings.

[0083] 2. Microcapsule gel property testing

[0084] The gel properties of isocyanate microcapsules are negatively correlated with their repair capabilities within a certain range. When the microcapsules rupture, the isocyanate repair components react with water to gel, which inhibits their repair effect on the coating and leads to a reduction in the coating's service life. Therefore, studying the gel properties of microcapsules when they rupture can, to some extent, characterize their expected effect on crack repair.

[0085] Simulated water: Dissolve 0.8g of calcium chloride, 0.2g of sodium sulfate and 2.5g of sodium chloride in deionized water, then transfer to a 100mL volumetric flask, bring the volume to 100mL, shake well and maintain the temperature at 25℃ to obtain simulated water.

[0086] Prepare 25 mL of simulated water. Take 0.5 g of each of the microcapsules from Examples 1-3 and Comparative Examples 1-2 and place them in the measuring cup of the rheometer. Crush them with a pestle for 10 seconds, then quickly pour in all the volumes of simulated water to obtain the test solution. Then start the rheometer and measure the temperature at 5 seconds. -1 The system was continuously stirred at a low shear rate, and the viscosity (η) of the system was continuously recorded over time. The viscosity curves of the test solutions in Example 2 and Comparative Example 1 over time are shown below. Figure 1 As shown.

[0087] Take Example 2 and Comparative Example 1 and combine them. Figure 1 It can be concluded that the microcapsules in the test solution of Example 2 exhibit a significant hysteresis in gelation behavior compared to Comparative Example 1 under the test conditions. Furthermore, the Comparative Example test solution shows a small peak of rapid viscosity increase at 30-38 s, which is attributed to the direct reaction between isocyanate and water in the repair solution, leading to gelation. Since Comparative Example 1 did not add fluorouracil and propylene carbonate components to inhibit water molecule reaction during microcapsule preparation, the degree of contact reaction between the isocyanate repair solution and water molecules intensifies when the microcapsules break, resulting in a sharp increase in the viscosity of the test solution. It can be predicted that the coating material prepared by adding microcapsules to the coating system using the scheme of Example 2 will, when the coating breaks, allow the repair solution within the microcapsules to more fully penetrate the crack tip and achieve a better repair effect through a curing reaction.

[0088] Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A method for preparing an anti-corrosion carbon nanopolymer coating for oil pipelines, characterized in that, It is prepared by mixing the following raw materials in parts by weight: 80-90 parts base resin, 8-12 parts microcapsules, 1-5 parts carbon nanotubes, 0.5-2 parts talc, 0.5-1 part preservative, 0.1-0.5 parts defoamer, and 0.2-0.3 parts leveling agent; The microcapsule preparation steps include the following: S01. Take water and ethanol, mix them, add emulsifier, heat and stir to obtain solution A; S02. Fluorouracil, propylene carbonate, and isophorone diisocyanate are stirred and mixed, and then dispersed with ethyl acetate to obtain solution B; the mass-to-volume ratio of fluorouracil, propylene carbonate, isophorone diisocyanate, and ethyl acetate is (0.2-0.3) g:(0.6-0.7) g:(7-8) g:(8.5-9.2) mL; S03. Mix solution B with solution A, adjust the water-oil ratio to (20-30):1, emulsify by high-speed shearing, then add an interface agent to catalyze the reaction, let it stand and age, and then wash it with water 2-3 times after centrifugation and filtration to obtain the final product; the interface agent includes phosphatidylcholine and laurylamine; the catalyst used in the catalytic reaction is one of dibutyltin dilaurate, dimethylcyclohexylamine and triethylenediamine.

2. The method for preparing an anti-corrosion carbon nanopolymer coating for oil pipelines according to claim 1, characterized in that, The base resin is composed of 75%-80% phenolic resin and 20%-25% epoxy resin by mass.

3. The method for preparing an anti-corrosion carbon nanopolymer coating for oil pipelines according to claim 1, characterized in that, The preservative is at least one of organic acid salt preservatives and isothiazolinone preservatives.

4. The method for preparing an anti-corrosion carbon nanopolymer coating for oil pipelines according to claim 1, characterized in that, In step S01, the mass-volume ratio of water, ethanol and emulsifier is (100-150) mL:(30-50) mL:(0.3-2) g; the emulsifier is at least one of gum arabic, Tween-20 and polyethylene glycol castor oil ester.

5. The method for preparing an anti-corrosion carbon nanopolymer coating for oil pipelines according to claim 1, characterized in that, In step S03, the high-speed shear emulsification setting is an emulsification shearing speed of 10000-15000 rpm.

6. A carbon nanoparticle polymer coating for corrosion protection of oil pipelines, characterized in that, It is prepared by any one of the preparation methods described in claims 1-5.

7. An application of a carbon nanoparticle polymer coating for corrosion protection of oil pipelines, characterized in that, The anti-corrosion carbon nanopolymer coating for oil pipelines as described in claim 6 is used for oil pipeline protection.

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