Intelligent hydrogen sulfide-resistant anticorrosive coating for coal chemical industry pipeline and preparation method of intelligent hydrogen sulfide-resistant anticorrosive coating

Abstract

The invention discloses an intelligent hydrogen sulfide-resistant anticorrosive coating for a coal chemical industry pipeline and a preparation method, and belongs to the technical field of corrosion prevention of coal chemical industry pipelines. The coating is composed of a base material, a functional filler, an intelligent component and an auxiliary agent, the base material improves the mechanical property and chemical stability, the functional filler enhances the hydrogen sulfide corrosion resistance, and the intelligent components achieve the self-repairing function of the coating. The preparation method comprises the steps of microcapsule preparation, component mixing, ultrasonic dispersion, coating and thermocuring. The corrosion resistance of the coating is greater than or equal to 95% under the environment of 80 DEG C, 90% humidity and 1000ppm H2S, the adhesive force reaches grade 1, the tensile strength is 10-20MPa, and the elongation at break is 200-300%. The high-corrosion-resistance and self-repairing pipeline protection material has high corrosion resistance, self-repairing capacity and construction convenience, and is suitable for pipeline protection in a high-concentration hydrogen sulfide environment.

Description

Technical Field

[0001] The present invention belongs to the technical field of anti-corrosion of coal chemical industry pipelines, and particularly relates to an intelligent anti-hydrogen sulfide anti-corrosion coating for coal chemical industry pipelines and a preparation method thereof, which is particularly suitable for pipeline protection in an environment with high-concentration hydrogen sulfide. Background Art

[0002] In the field of coal chemical industry, pipelines are often exposed to an environment with high-concentration hydrogen sulfide (H2S), resulting in serious corrosion problems. Existing anti-corrosion coatings have deficiencies in terms of durability and anti-corrosion performance. Especially in complex working conditions of high temperature, high humidity and high-concentration hydrogen sulfide, the coatings are prone to failure, leading to pipeline perforation and leakage, which seriously affects production safety and efficiency.

[0003] In the prior art, an anti-corrosion layer for buried pipelines (CN 105423067 A) discloses that the anti-corrosion layer mainly consists of a primer, a topcoat, a curing agent, a diluent and a glass cloth, and the anti-corrosion performance is improved by multi-layer coating and glass cloth reinforcement. However, in actual application, there are problems of low strength and easy fracture. Especially under mechanical stress and environmental changes, the coatings have poor stability and insufficient durability. A compatibilizer for polyphenylene sulfide and polyamide (CN 103755881 A) discloses that the compatibility of polyphenylene sulfide and polyamide is improved through specific chemical structure design and graft modification. However, this compatibilizer has problems of coating aging and poor repair effect in actual application. Especially during long-term use, the durability and repair performance of the coatings gradually decline, affecting the normal operation of the pipelines. A polyphenylene sulfide polyamide resin composition (CN 109749015A) discloses that the corrosion resistance of the material is improved through a specific formulation and preparation process. The corrosion resistance of this composition in an environment with high-concentration hydrogen sulfide still needs to be improved. Especially in complex working conditions of high temperature, high humidity and high-concentration hydrogen sulfide, the corrosion resistance of the coatings is insufficient. A polyphenylene sulfide composite material, its preparation method and application (CN 110791095 A) disclose that polyphenylene sulfide is mixed with specific reinforcing materials and additives, and a polyphenylene sulfide composite material is prepared through processes such as melt blending. This composite material still has deficiencies in mechanical properties. Summary of the Invention

[0004] One technical problem solved by the present invention is to provide an anti-hydrogen sulfide anti-corrosion coating for coal chemical industry pipelines, which can maintain long-term stability in an environment of high temperature, high humidity and high-concentration hydrogen sulfide, and has good adhesion and mechanical properties, and at the same time has self-healing and self-diagnosis functions. Another technical problem to be solved by the present invention is to provide a preparation method for an anti-hydrogen sulfide anti-corrosion coating for coal chemical industry pipelines, including steps of microcapsule preparation, component mixing, ultrasonic dispersion, coating and thermal curing.

[0005] Technical solution: To solve the above technical problems, the technical solution adopted by the present invention is as follows:

[0006] An anti-hydrogen sulfide anti-corrosion coating for coal chemical pipelines, which is composed of a matrix material, a functional filler, an intelligent component, and an additive; the dosage of the following raw material components is expressed in parts by mass;

[0007] The matrix material is 88-90 parts of polyphenylene sulfide resin, which is compositely modified by introducing 3-4 parts of nano-graphene quantum dots and 5-6 parts of polyvinylidene fluoride to form a matrix with good mechanical properties and chemical stability;

[0008] The functional filler is composed of 1-4 parts of zinc sulfide nanoparticles and 0.5-3 parts of imidazoline derivatives to enhance the anti-hydrogen sulfide corrosion resistance of the coating; preferably, the functional filler is composed of 2-3 parts of zinc sulfide nanoparticles and 1.5-2 parts of imidazoline derivatives;

[0009] The intelligent component is composed of 0.5-4 parts of microencapsulated self-healing material and 0.5-4 parts of shape memory polymer; preferably, the intelligent component is composed of 2-3 parts of microencapsulated self-healing material and 2-3 parts of shape memory polymer to achieve the self-healing function of the coating; the microencapsulated self-healing material is composed of a urea-formaldehyde resin wall material wrapping 1.5-2 parts of epoxy resin and 0.3-0.4 parts of a curing agent core material, and the shape memory polymer is a polyurethane-type polymer; the dosage of the urea-formaldehyde resin is 40% of the total mass of the epoxy resin and the curing agent; when the coating is damaged, the microcapsules rupture to release the self-healing agent to achieve the automatic repair function;

[0010] The additive is composed of 0.1-1 part of a film-forming aid, 0.1-1 part of an antifoaming agent, 0.1-1 part of a wetting agent, 0.1-1 part of sodium polyacrylate, and 0.1-1 part of hydroxypropyl methylcellulose to optimize the construction performance and stability of the coating; preferably, the additive is composed of 0.5-0.6 part of a film-forming aid, 0.3-0.4 part of an antifoaming agent, 0.2-0.3 part of a wetting agent, 0.4-0.5 part of sodium polyacrylate, and 0.3-0.4 part of hydroxypropyl methylcellulose.

[0011] For the anti-hydrogen sulfide anti-corrosion coating for coal chemical pipelines, the molecular weight of the polyphenylene sulfide resin is 100,000-200,000 g / mol, the melt index is 5-10 g / 10 min, and the glass transition temperature is 200-250 °C; the particle size of the nano-graphene quantum dots is 5-10 nm, and the specific surface area is 200-300 m 2 / g, with an oxidation degree such that the oxygen-containing functional groups (such as hydroxyl groups and carboxyl groups) account for more than 50% of the total surface functional groups; the molecular weight of the polyvinylidene fluoride is 150,000 - 300,000 g / mol, the melting temperature is 170 - 190 °C, and the crystallinity is 50% - 60%; preferably, the molecular weight of the PPS resin is 150,000 g / mol, the melt index is 7 g / 10 min, and the glass transition temperature is 220 °C; the molecular weight of the polyvinylidene fluoride is 150,000 g / mol, the melting temperature is 175 °C, and the crystallinity is 58%.

[0012] For the anti-hydrogen sulfide corrosion protection coating for coal chemical industry pipelines, the particle size of the zinc sulfide (ZnS) nanoparticles is 10 - 20 nm, the purity ≥ 99.9%, and the specific surface area is 50 - 100 m 2 / g; the molecular weight of the imidazoline derivative is 200 - 300 g / mol, and the corrosion inhibition efficiency is more than 90%; preferably, the molecular weight of the imidazoline derivative is 280 g / mol.

[0013] For the anti-hydrogen sulfide corrosion protection coating for coal chemical industry pipelines, the molecular weight of the urea-formaldehyde resin wall material is 5000 g / mol, the particle size is 5 - 10 μm, and the wall thickness is 0.5 - 1 μm; the glass transition temperature of the polyurethane-based polymer is 60 - 80 °C, the tensile strength is 10 - 20 MPa, and the elongation at break is 200% - 300%; the action mechanism of the polyurethane-based polymer is that temperature-triggered deformation repairs the coating cracks, and it synergistically acts with the microcapsule repair to further improve the self-repair ability of the coating; preferably, the glass transition temperature of the polyurethane-based polymer is 70 °C, the tensile strength is 18 MPa, and the elongation at break is 265%.

[0014] For the anti-hydrogen sulfide corrosion protection coating for coal chemical industry pipelines, the epoxy resin is bisphenol A type, with a molecular weight of 300 - 700 g / mol and an epoxy value of 0.2 - 0.4 eq / g; the curing agent is one or more of vinyltriamine, aminoethylpiperazine, m-phenylenediamine, diaminodiphenylmethane, oxalic dihydrazide, diaminodiphenyl sulfone, or dicyandiamide; preferably, the molecular weight of bisphenol A type is 400 g / mol and the epoxy value is 0.2 eq / g.

[0015] For the anti-hydrogen sulfide corrosion protection coating for coal chemical industry pipelines, the preparation of the microencapsulated self-healing material includes:

[0016] (1) Dissolve the epoxy resin and the curing agent in ethyl acetate (the solvent dosage is 50% of the total mass of the core material) to form a core material solution;

[0017] (2) Use urea-formaldehyde resin (dosage is 40% of the core material mass) as the wall material, and encapsulate the core material solution by interfacial polymerization (reaction temperature 60 °C, time 2 hours);

[0018] (3) Mix the core material and the wall material solution, stir and cure, then centrifuge and wash to obtain the microencapsulated self-healing material.

[0019] For the anti-hydrogen sulfide anti-corrosion coating used for coal chemical industry pipelines, the film-forming auxiliary agent is one or more of propylene glycol methyl ether acetate, propylene glycol butyl ether or ethylene glycol ethyl ether acetate; the defoaming agent is one or more of polydimethylsiloxane, dimethyl silicone oil or polyether-modified silicone oil; the wetting agent is one or more of sodium alkylbenzene sulfonate, sodium fatty alcohol polyether sulfate or sodium fatty alcohol polyether sulfonate.

[0020] For the anti-hydrogen sulfide anti-corrosion coating used for coal chemical industry pipelines, the molecular weight of sodium polyacrylate is 4000 - 6000 g / mol; the molecular weight of hydroxypropyl methylcellulose is 100000 - 200000 g / mol, and the viscosity is 15000 - 30000 mPa·s; preferably, the molecular weight of sodium polyacrylate is 4800 g / mol; the molecular weight of hydroxypropyl methylcellulose is 200000 g / mol, and the viscosity is 20000 mPa·s.

[0021] The preparation method of the above-mentioned anti-hydrogen sulfide anti-corrosion coating used for coal chemical industry pipelines includes the following steps:

[0022] (1) Add polyphenylene sulfide resin, nano-graphene quantum dots, polyvinylidene fluoride and zinc sulfide nanoparticles into a high-speed mixer, with a stirring speed of 300 - 500 rpm, and stir for 30 minutes; preferably, the stirring speed is 400 rpm;

[0023] (2) Add imidazoline derivatives, microencapsulated self-healing material, shape memory polymer and additives, and continue to stir for 1 hour;

[0024] (3) Use ultrasonic dispersion equipment to process the mixture to ensure uniform dispersion of each component;

[0025] (4) Uniformly coat the mixture on the surface of the pipeline, and control the coating thickness at 200 - 300 μm; preferably, the coating thickness is 250 - 300 μm;

[0026] (5) Perform thermal curing treatment at 120 - 150 °C for 2 hours to form a dense protective layer on the coating; preferably, the thermal curing temperature is 130 - 140 °C.

[0027] Beneficial effects: Compared with the prior art, the present invention has the following advantages:

[0028] (1) By optimizing the coating formulation, specific nanoparticles and polymer polymers are introduced into the coating. These components can not only effectively resist the corrosion of high-concentration hydrogen sulfide, but also significantly improve the hardness and flexibility of the coating. Experimental data show that the corrosion resistance rate of the coating reaches more than 95% in an environment of 80 °C, 90% humidity, and 1000 ppm H2S, the self-healing efficiency reaches more than 85%, the adhesion test result is grade 1, the tensile strength is 10-20 MPa, and the elongation at break is 200%-300%.

[0029] (2) In the nano-graphene quantum dots of the present invention, the rich oxygen-containing functional groups (hydroxyl groups, carboxyl groups) on their surfaces can form a firm bond with the pipeline substrate through chemical bonding, greatly improving the adhesion of the coating, and the adhesion can reach grade 1. The coating also contains self-healing microcapsules. When scratches or damages appear on the coating surface, these microcapsules will release repair agents to automatically fill the damaged parts, thereby extending the service life of the coating. The addition of shape memory polymers further enhances the self-healing ability of the coating, which can automatically repair cracks under temperature changes, and cooperate with the microcapsule repair to significantly improve the durability of the coating.

[0030] (3) The coating construction process provided by the present invention is simple and convenient, and can be constructed by spraying or brushing methods, which is suitable for pipelines of different shapes and sizes. It not only improves the construction efficiency, but also reduces the construction difficulty and cost. The coating has good leveling and curing properties during the construction process, and can form a uniform and dense coating in a short time, further improving the protection performance and service life of the coating. Specific Embodiments

[0031] The following further clarifies the present invention in conjunction with specific embodiments. The embodiments are implemented on the premise of the technical solution of the present invention. It should be understood that these embodiments are only used to illustrate the present invention and not to limit the scope of the present invention. The dosage of raw material components in the following embodiments is expressed in parts by mass.

[0032] Example 1

[0033] A preparation method for an anti-hydrogen sulfide anti-corrosion coating for coal chemical pipelines includes the following steps:

[0034] 1. Preparation of microencapsulated self-healing materials

[0035] (1) Dissolve 1.5 parts of bisphenol A epoxy resin (molecular weight 400 g / mol, epoxy value 0.2 eq / g) and 0.3 parts of vinyltriamine curing agent in ethyl acetate (the solvent dosage is 50% of the total mass of epoxy resin and curing agent) respectively to form a core material solution;

[0036] (2) Using urea-formaldehyde resin (with a dosage of 40% of the total mass of epoxy resin and curing agent, molecular weight of 5000 g / mol, particle size of 5 - 10 μm) as the wall material, with a wall thickness of 0.5 - 1 μm, through interfacial polymerization at a reaction temperature of 60°C for 2 hours, the core material solution was encapsulated;

[0037] (3) The core material solution and the wall material solution were mixed, stirred, and cured to form microcapsules;

[0038] (4) After centrifugation and washing, the microencapsulated self-healing material was obtained, with a microcapsule particle size of 8 μm, a core material content of 60%, and a wall material thickness of 0.8 μm.

[0039] 2. Coating Preparation

[0040] (1) 90 parts of PPS resin (molecular weight of 150000 g / mol, melt index of 7 g / 10 min, glass transition temperature of 220°C), 3 parts of nano-graphene quantum dots (particle size of 5 - 10 nm, specific surface area of 200 - 300 m 2 / g), 5 parts of polyvinylidene fluoride (molecular weight of 150000 g / mol, melting temperature of 175°C, crystallinity of 58%), 2 parts of ZnS nanoparticles (particle size of 10 - 20 nm, purity ≥ 99.9%, specific surface area of 50 - 100 m 2 / g) were added to a high-speed mixer and stirred at 400 rpm for 30 minutes;

[0041] (2) 1.5 parts of imidazoline derivative (molecular weight of 280 g / mol, corrosion inhibition efficiency above 90%), 2 parts of microencapsulated self-healing material, 2 parts of polyurethane shape memory polymer (glass transition temperature of 70°C, tensile strength of 18 MPa, elongation at break of 265%), as well as 0.5 part of propylene glycol methyl ether acetate film-forming aid, 0.3 part of polydimethylsiloxane defoamer, 0.2 part of alkylbenzene sulfonate wetting agent, 0.4 part of sodium polyacrylate (molecular weight of 4800 g / mol), 0.3 part of hydroxypropyl methylcellulose (molecular weight of 200000 g / mol, viscosity of 20000 mPa·s) were added in sequence and stirring continued for 1 hour;

[0042] (3) Using an ultrasonic dispersion device, the mixture was treated at a frequency of 40 kHz and a power of 500 W for 30 minutes to ensure uniform dispersion of each component;

[0043] (4) The mixture was uniformly coated on the surface of the pipeline, controlling the coating thickness to be 250 μm;

[0044] (5) Heat curing was carried out at 130°C for 2 hours to form a dense protective layer.

[0045] Example 2

[0046] Preparation method of anti-hydrogen sulfide anti-corrosion coating for coal chemical industry pipelines, comprising the following steps:

[0047] 1. Preparation of microencapsulated self-healing material

[0048] (1) Dissolve 2 parts of bisphenol A epoxy resin (molecular weight 400 g / mol, epoxy value 0.2 eq / g) and 0.4 part of vinyltriamine curing agent in ethyl acetate (the solvent dosage is 50% of the total mass of the epoxy resin and the curing agent) respectively to form a core material solution;

[0049] (2) Use urea-formaldehyde resin (dosage is 40% of the total mass of the epoxy resin and the curing agent, molecular weight 5000 g / mol, particle size 5 - 10 μm) as the wall material, wall thickness 0.5 - 1 μm, through interfacial polymerization, reaction temperature 60 °C, reaction time 2 hours, to encapsulate the core material solution;

[0050] (3) Mix the core material solution and the wall material solution, stir and cure to form microcapsules;

[0051] (4) After centrifugation and washing, obtain the microencapsulated self-healing material, microcapsule particle size 10 μm, core material content 65%, wall material thickness 0.7 μm.

[0052] 2. Coating preparation

[0053] (1) Add 88 parts of PPS resin (molecular weight 150000 g / mol, melt index 7 g / 10 min, glass transition temperature 220 °C), 4 parts of nano-graphene quantum dots (particle size 5 - 10 nm, specific surface area 200 - 300 m 2 / g), 6 parts of polyvinylidene fluoride (molecular weight 150000 g / mol, melting temperature 175 °C, crystallinity 58%), 3 parts of ZnS nanoparticles (particle size 10 - 20 nm, purity ≥ 99.9%, specific surface area 50 - 100 m 2 / g) into a high-speed mixer, and stir at 400 rpm for 30 minutes;

[0054] (2) Sequentially add 2 parts of imidazoline derivative (molecular weight 280 g / mol, corrosion inhibition efficiency above 90%), 3 parts of microencapsulated self-healing material, 3 parts of polyurethane shape memory polymer (glass transition temperature 70 °C, tensile strength 18 MPa, elongation at break 265%), as well as 0.6 part of propylene glycol butyl ether film-forming aid, 0.4 part of dimethyl silicone oil defoamer, 0.3 part of fatty alcohol polyether sulfate wetting agent, 0.5 part of sodium polyacrylate (molecular weight 4800 g / mol), 0.4 part of hydroxypropyl methyl cellulose (molecular weight 200000 g / mol, viscosity 20000 mPa·s), and continue to stir for 1 hour;

[0055] (3) Use an ultrasonic dispersion device to process the mixture for 30 minutes at a frequency of 40 kHz and a power of 500 W to ensure uniform dispersion of each component;

[0056] (4) Uniformly coat the mixture on the surface of the pipeline, and control the coating thickness to be 300 μm;

[0057] (5) Thermally cure at 140 °C for 2 hours to form a dense protective layer.

[0058] According to JB / T 7901-2023 "Full immersion test method for uniform corrosion of metallic materials in the laboratory", test the corrosion resistance rate of the coating in an environment of 80 °C, 90% humidity, and 1000 ppm H2S. Use GB / T 9286-2021 "Cross-cut test for paints and varnishes" to test the adhesion of the coating, and use GB / T 1040-2018 "Determination of tensile properties of plastics" to test the mechanical properties of the coating. The results are shown in Table 1.

[0059] Table 1 Performance test results of the coatings prepared in Example 1 and Example 2

[0060] Index Example 1 Example 2 Corrosion resistance rate / % 96 97 Adhesion Grade 1 Grade 1 Tensile strength / MPa 16 18 Elongation at break / % 260 280

[0061] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art of this technology, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. An anti-hydrogen sulfide anti-corrosion coating for coal chemical industry pipelines, characterized in that, It consists of a matrix material, functional fillers, intelligent components, and additives; The matrix material is obtained by compound modification of 88 - 90 parts of polyphenylene sulfide resin with 3 - 4 parts of nano-graphene quantum dots and 5 - 6 parts of polyvinylidene fluoride; The functional fillers consist of 1 - 4 parts of zinc sulfide nanoparticles and 0.5 - 3 parts of imidazoline derivatives; The intelligent components consist of 0.5 - 4 parts of microencapsulated self-healing materials and 0.5 - 4 parts of shape memory polymers. The microencapsulated self-healing materials are composed of a urea-formaldehyde resin wall material encapsulating 1.5 - 2 parts of epoxy resin and 0.3 - 0.4 parts of a curing agent core material. The shape memory polymer is a polyurethane-based polymer; the amount of urea-formaldehyde resin is 40% of the total mass of the epoxy resin and the curing agent; The additives consist of 0.1 - 1 part of film-forming aids, 0.1 - 1 part of defoamers, 0.1 - 1 part of wetting agents, 0.1 - 1 part of sodium polyacrylate, and 0.1 - 1 part of hydroxypropyl methylcellulose.

2. The anti-hydrogen sulfide anti-corrosion coating for coal chemical industry pipelines according to claim 1, characterized in that, The molecular weight of the polyphenylene sulfide resin is 100,000 to 200,000 g / mol, the melt index is 5 to 10 g / 10 min, and the glass transition temperature is 200 to 250 °C; the particle size of the nano-graphene quantum dots is 5 to 10 nm, the specific surface area is 200 to 300 m 2 / g, and the proportion of oxygen-containing functional groups is ≥50%; the molecular weight of the polyvinylidene fluoride is 150,000 to 300,000 g / mol, the melting temperature is 170 to 190 °C, and the crystallinity is 50% to 60%.

3. The anti-hydrogen sulfide anti-corrosion coating for coal chemical industry pipelines according to claim 1, characterized in that, The particle size of the zinc sulfide nanoparticles is 10-20 nm, the purity is ≥99.9%, and the specific surface area is 50-100 m 2 / g; the molecular weight of the imidazoline derivative is 200-300 g / mol, and the corrosion inhibition efficiency is ≥90%.

4. The anti-hydrogen sulfide anti-corrosion coating for coal chemical industry pipelines according to claim 1, characterized in that The urea-formaldehyde resin wall material has a molecular weight of 5000 g / mol, a particle size of 5 - 10 μm, and a wall thickness of 0.5 - 1 μm; the polyurethane-based polymer has a glass transition temperature of 60 - 80 °C, a tensile strength of 10 - 20 MPa, and an elongation at break of 200% - 300%.

5. The anti-hydrogen sulfide anti-corrosion coating for coal chemical industry pipelines according to claim 1, characterized in that, The epoxy resin is bisphenol A type, with a molecular weight of 300 - 700 g / mol and an epoxy value of 0.2 - 0.4 eq / g; the curing agent is one or more of vinyltriamine, aminoethylpiperazine, m-phenylenediamine, diaminodiphenylmethane, oxalic dihydrazide, diaminodiphenyl sulfone, or dicyandiamide.

6. The anti-hydrogen sulfide corrosion protection coating for coal chemical industry pipelines according to claim 1, wherein The preparation of the microencapsulated self-healing materials includes: (1) Dissolve the epoxy resin and the curing agent in ethyl acetate to form a core material solution; the amount of ethyl acetate used is 50% of the total mass of the core material; (2) Use urea-formaldehyde resin as the wall material and encapsulate the core material solution by interfacial polymerization; the amount of urea-formaldehyde resin used is 40% of the mass of the core material; the reaction temperature of the interfacial polymerization is 60 °C and the time is 2 hours; (3) Mix the core material and the wall material solution, stir and cure, and then centrifuge and wash to obtain the microencapsulated self-healing materials.

7. The anti-hydrogen sulfide anti-corrosion coating for coal chemical industry pipelines according to claim 1, characterized in that, The film-forming aids are one or more of propylene glycol methyl ether acetate, propylene glycol butyl ether, or ethylene glycol ethyl ether acetate; the defoamers are one or more of polydimethylsiloxane, dimethyl silicone oil, or polyether-modified silicone oil; the wetting agents are one or more of sodium alkylbenzene sulfonate, fatty alcohol polyether sulfate, or fatty alcohol polyether sulfonate.

8. The anti-hydrogen sulfide corrosion protection coating for coal chemical industry pipelines according to claim 7, characterized in that, The molecular weight of sodium polyacrylate is 4000 - 6000 g / mol; the molecular weight of hydroxypropyl methylcellulose is 100000 - 200000 g / mol, and the viscosity is 15000 - 30000 mPa·s.

9. The preparation method of the anti-hydrogen sulfide anti-corrosion coating according to any one of claims 1-8, characterized in that, It includes the following steps: (1) Add the polyphenylene sulfide resin, nano-graphene quantum dots, polyvinylidene fluoride, and zinc sulfide nanoparticles into a high-speed mixer and stir at 300 - 500 rpm for 30 minutes; (2) Add the imidazoline derivatives, microencapsulated self-healing materials, shape memory polymers, and additives, and continue to stir for 1 hour; (3) Perform ultrasonic dispersion treatment on the mixture until it is uniform; (4) Coat the mixture on the surface of the pipeline, controlling the coating thickness to be 200 - 300 μm; (5) Thermally cure at 120 - 150 °C for 2 hours to form a dense protective layer.