High-temperature-resistant, wear-resistant and heavy-duty coating for oil drilling pipe and preparation method thereof

Abstract

The preparation method comprises the following steps: by taking epoxy resin and boron phenolic resin as matrix resin and taking a graphene / titanium nano / nano aluminum oxide epoxy polymer and a toughening agent as modifiers, adding functional pigments and fillers, and under the cooperation of a diluent, an auxiliary agent and a curing agent, preparing the high-temperature-resistant, wear-resistant and heavy-duty coating for the petroleum drilling oil pipe, thereby obtaining the high-temperature-resistant, wear-resistant and heavy-duty coating for the petroleum drilling oil pipe. The high-temperature-resistant, wear-resistant and heavy-duty coating for the oil drilling pipe is prepared. The coating has the advantages of high temperature resistance of 200 DEG C, high wear resistance, heavy corrosion resistance, high hardness (6H), scaling resistance, good toughness and the like. The coating is suitable for coating protection of petroleum well drill rods, casing pipes, oil pipes, oil delivery gas pipes, sucker rods, underground equipment and the like.

Description

Technical Field

[0001] This invention relates to the field of protective coatings for oilfield equipment, and in particular to a high-temperature resistant, wear-resistant, heavy-duty anti-corrosion coating for oil drilling tubing and its preparation method. Background Technology

[0002] Oilfield drilling tubing includes drill pipe, casing, tubing, oil delivery pipe, sucker rod, and downhole equipment. With the development of deeper wells and geological formations containing hydrogen sulfide, the working environment for oil pipes and downhole equipment is extremely harsh: oil and gas well temperatures can reach 180℃, pressures can reach 100MPa, and they are exposed to highly corrosive media such as high levels of hydrogen sulfide, carbon dioxide, and chloride ions. The requirements for the high-temperature resistance, wear resistance, and corrosion resistance of drill pipe, casing, and tubing are becoming increasingly stringent. Investment in casing alone accounts for 50%-60% of the total investment in drilling and oil production. Annual losses due to corrosion of casing caused by hydrogen sulfide, produced fluids, and high temperatures amount to hundreds of millions of yuan, and the indirect losses from leaks, pollution, and production stoppages are incalculable. Oil pipe corrosion has become an urgent problem that needs to be solved.

[0003] Currently, all protective coatings for oil pipelines use epoxy phenolic resin coatings. Although this coating has wear resistance, corrosion resistance, and temperature resistance, its overall performance decreases when used in oil and gas wells above 100°C. When the coating is immersed for one week in corrosive media such as 140°C, 35MPa pressure, and high concentrations of hydrogen sulfide, carbon dioxide, chloride, and salt, blistering and peeling will occur.

[0004] Improving the high-temperature resistance, wear resistance, scale prevention, and heavy-duty corrosion resistance of protective coatings for oil pipelines, and extending the service life of oil pipelines, is a technical problem that urgently needs to be solved. Summary of the Invention

[0005] The purpose of this invention is to provide a high-temperature resistant, wear-resistant, heavy-duty anti-corrosion coating for oil drilling tubing and its preparation method, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a high-temperature resistant, wear-resistant, heavy-duty anti-corrosion coating for oil drilling tubing and its preparation method, comprising, by mass percentage, component A and component B; The composition of component A, by mass percentage, includes the following components: epoxy resin 5-10%, boron phenolic resin 5-10%, graphene / titanium nano / nano alumina epoxy polymer 10-30%, toughening agent 3-8%, rutile titanium dioxide 4-8%, silicon carbide powder 3-6%, precipitated barium sulfate 5-10%, talc powder 5-10%, molybdenum disulfide powder 3-8%, anti-settling agent 0.5-1%, thickener 0.5-1%, dispersant 0.5-1%, defoamer 0.2-0.5%, leveling agent 0.3-0.5%, and mixed solvent 25-35%. Component B is T31 phenolic amine curing agent.

[0007] Preferably, the graphene / titanium nano / nano alumina epoxy polymer comprises, by mass percentage, the following components: 30-50% bisphenol A type epoxy resin, 5-10% liquid nitrile rubber, 10-20% metallic titanium powder, 2-5% expanded graphite, 1-2% nano alumina, 0.1-0.5% silane coupling agent, 1-2% dispersant, 0.3-0.5% defoamer, 0.5-1% catalyst, and 30-40% solvent.

[0008] Preferred preparation of component A: Step 1: Add mixed solvent to the dispersion tank, add epoxy resin, boron phenolic resin and toughening agent under medium and low speed stirring, mix evenly, add dispersant, defoamer and pigments and fillers, disperse at high speed for 30 minutes, grind to fineness of 20um in a sand mill to obtain pigment paste; Step 2: Transfer the pigment paste into the paint mixing tank, add the anti-settling agent, thickener, graphene / titanium nano / nano alumina epoxy polymer, and leveling agent under medium-speed stirring, stir for 30 minutes, filter, and package.

[0009] Preferred formulation of component B: Step 1: Implement the construction mix proportion, with a mass ratio of component A: component B = 100:5 Step 2: Perform the curing process. After the steel pipe is coated by spraying, dipping or other methods, it is kept at a constant temperature of 70°C for 0.5 hours. Step 3: Next, raise the temperature to 107℃ and maintain it for 0.5 hours; Step 4: Then raise the temperature to 140℃ and maintain it for 0.5 hours; Step 5: Finally, raise the temperature to 170℃ and cure for 2 hours.

[0010] Preferred method for preparing graphene / titanium nanoparticles / nano-alumina epoxy polymers: Step 1: Freeze-treating expanded graphite powder: Freeze the expanded graphite at -20℃ for more than 12 hours, and set aside for later use; Step 2: Weigh the ingredients according to the proportion and inject the mixed solvent into the mixing tank. During the stirring process, add epoxy resin, dispersant, defoamer and organic bentonite in sequence, and stir thoroughly until they are evenly dissolved to obtain a polymer solution. Step 3: Load the polymer solution, titanium powder, freeze-expanded graphite, and nano-alumina into the ball mill jar of a planetary ball mill, control the ball-to-material ratio at 4:1, set the rotation speed at 600 r / min, grind for 6 hours, and then pour it into an ultrasonic oscillator to disperse for 30 minutes to obtain a graphene / nano-titanium / alumina epoxy polymer with a particle size between 50 nm and 80 nm.

[0011] The technical effects and advantages of this invention are as follows: This invention uses epoxy resin and boron phenolic resin as base resins, graphene / titanium nanoparticle / alumina epoxy polymer and toughening agent as modifiers, and adds functional pigments and fillers. With the cooperation of diluent, additives and curing agents, a high-temperature resistant, wear-resistant and heavy-duty anti-corrosion coating for oil drilling tubing is prepared. Detailed Implementation

[0012] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0013] This invention provides a high-temperature resistant, wear-resistant, heavy-duty anti-corrosion coating for oil drilling tubing and its preparation method. The prepared coating has advantages such as high temperature resistance up to 200℃, high wear resistance, heavy-duty anti-corrosion, high hardness (6H), anti-scaling, and good toughness. It is suitable for coating and protecting oil well drill pipes, casings, tubing, oil and gas pipelines, sucker rods, and downhole equipment.

[0014] Key properties, state in the container: soft sediment, homogeneous after stirring. See the table below for details: Product Performance Index Data Table Indicator Type Indicator Details Solid content (unit: %) 58.0 Viscosity (Ford Cup 4) (unit: S) 80-120 Fineness (unit: μm) 20.0 Adhesion (unit: grade) 1.0MPa Impact resistance (unit: cm) 50.0 Abrasion resistance (1000g / 1000r) (unit: mg) 10.0 Flexibility (unit: mm) 0.5 Hardness (unit: H) 6.0 <![CDATA[Acid resistance (10% H2SO4, 720 h)]]> Coating does not change color Alkali resistance (10% NaOH, 720h) Coating does not change color Salt water resistance (72h) No rust Salt spray resistance (2500h) It shows signs of self-repair and has no rust. Weather resistance (5000h) No chalking, no loss of gloss, Grade 1 This invention provides a composition for a high-temperature resistant, wear-resistant, heavy-duty anti-corrosion coating for oil drilling tubing: The coating consists of component A and component B: Composition of Component A: By mass percentage, it includes the following components: Epoxy resin 5-8%, boron phenolic resin 5-8%, graphene / titanium nanoparticle / alumina epoxy polymer 20-30%, toughening agent 3-5%, rutile titanium dioxide 4-7%, silicon carbide powder 3-5%, precipitated barium sulfate 5-8%, talc powder 5-8%, molybdenum disulfide powder 3-6%, anti-settling agent 0.5-1%, thickener 0.5-1%, dispersant 0.5-1%, defoamer 0.2-0.5%, leveling agent 0.3-0.5%, mixed solvent 25-35%.

[0015] Component B is T31 phenolic amine curing agent, with a mass fraction of 5%.

[0016] The present invention also provides a method for preparing a high-temperature resistant, wear-resistant, heavy-duty anti-corrosion coating for oil drilling tubing.

[0017] Step 1: Composition and preparation method of graphene / titanium nanoparticles / alumina epoxy polymer: Composition of graphene / titanium nanoparticle / alumina epoxy polymer: by mass percentage, it includes the following components: bisphenol A type epoxy resin 30-45%, liquid nitrile rubber 5-8%, metallic titanium powder 10-20%, expanded graphite 2-5%, nano alumina 1-2%, silane coupling agent 0.1-0.5%, dispersant 1-2%, defoamer 0.3-0.5%, catalyst 0.5-1%, solvent 30-40%.

[0018] Preparation method of graphene / titanium nanoparticles / alumina epoxy polymer: Preparation is carried out in 3 steps: Step 1, freeze-drying expanded graphite powder: Freeze the expanded graphite powder in an environment of -20℃ for more than 12 hours, and set aside for later use; Step 2: Weigh the mixed solvent according to the formula and add it to the mixing tank. While stirring, add epoxy resin, dispersant, defoamer and organic bentonite. Stir until dissolved and uniform to prepare polymer solution. Step 3: The polymer solution, titanium powder, freeze-expanded graphite, and nano-alumina are loaded into the ball mill jar of a planetary ball mill, with a ball-to-material ratio of 4:1. The rotation speed is adjusted to 600 r / min, and the mixture is ground for 6 hours. The mixture is then poured into an ultrasonic oscillator and dispersed for 30 minutes. The particle size is between 50 nm and 80 nm, thus preparing a graphene / nano-titanium / alumina alloy epoxy polymer.

[0019] Step 2: Preparation of Component A Add the mixed solvent to the dispersion tank, and add epoxy resin, boron phenolic resin, and toughening agent under medium-low speed stirring. Stir until uniform, then add dispersant, defoamer, pigments and fillers, and disperse at high speed for 30 minutes. Grind the mixture to a fineness of 20 μm using a sand mill to obtain pigment paste. Pour the pigment paste into a paint mixing tank, and add anti-settling agent, thickener, graphene / titanium nanoparticle / alumina epoxy polymer, and leveling agent under medium speed stirring. Stir for 30 minutes, then filter and package.

[0020] Component B: Weighing and packaging.

[0021] Construction mix proportion: The mass fraction ratio of component A to component B is 100:5 Curing conditions: After the steel pipe is coated by spraying, dipping or other methods, it is kept at 70℃ for 0.5h; then the temperature is raised to 107℃ and kept for 0.5h; then the temperature is raised to 140℃ and kept for 0.5h; finally, the temperature is raised to 170℃ and cured for 2h.

[0022] In this embodiment, the two-part type A epoxy resin is two-part type A epoxy resin E44. It has an epoxy equivalent of 210-244, excellent flowability, good dimensional stability after curing, low shrinkage (less than 2%), a coefficient of thermal expansion of 6-10%, excellent adhesion, good electrical insulation, and good mechanical and chemical stability. It is a commonly used base resin for anti-corrosion coatings.

[0023] In the embodiments, the boron phenolic resin is an FB high-temperature resistant flame-retardant thermosetting phenolic resin, a yellow solid powder, with a polymerization time (200℃ / S) of 70-100, an oxygen index of 48.5, and a curing temperature resistance of 300-400℃ when cured with epoxy resin. It has high oxygen index, low smoke, low toxicity, and low calorific value.

[0024] In the embodiments, the graphene / titanium nanoparticle / alumina epoxy polymer is a graphene / titanium nanoparticle / nanoalumina / polymer alloy material made by mixing metallic titanium powder, expanded graphite, nanoalumina, epoxy resin, liquid nitrile rubber, additives, and diluents and grinding them with a high-energy planetary ball mill. Titanium powder, expanded graphite, nano-alumina, epoxy resin, and liquid nitrile rubber are ball-milled in a high-energy ball mill. Mechanical energy is converted into heat energy, increasing the temperature and internal pressure inside the milling jar. The graphite / titanium powder particles expand and crack, and under high impact and shear forces, they undergo severe plastic deformation, resulting in lattice slippage, fragmentation, and the formation of numerous defects such as dislocations, stacking faults, and twins. This reduces crystal symmetry, decreases grain size, and transforms the particles into nanoscale sheet-like structures, increasing lattice distortion and surface activation. Simultaneously, the free radicals or free ions generated by the chain breakage of epoxy resin and liquid nitrile rubber under high impact and shear forces readily undergo grafting reactions with the activated inorganic nanosheets, generating a graphene / nano-titanium / nano-alumina alloy epoxy polymer. An appropriate amount of the polymer is added to an epoxy / boron phenolic resin, and a high-temperature resistant, wear-resistant, heavy-duty anti-corrosion coating for oil drilling tubing is prepared using the composite resin as the matrix resin. The coating has the advantages of high temperature resistance of 200℃, high wear resistance, heavy-duty anti-corrosion, high hardness (6H), anti-scaling, and good toughness.

[0025] In the embodiments, the toughening agent is a liquid nitrile rubber, a light yellow or brownish-brown viscous liquid, which can be used as an adhesive, coating, sealant, and toughening agent. It can be combined with phenolic resin and epoxy resin to prepare adhesives with strong adhesion, good toughness, and good oil resistance. Adding an appropriate amount of liquid nitrile rubber to high-temperature, wear-resistant, and heavy-duty anti-corrosion coatings for oil drilling tubing can significantly improve the toughness and oil resistance of the coating.

[0026] In this embodiment, the rutile titanium dioxide is selected from DuPont's R706.

[0027] In the embodiments, the silicon carbide powder is a green silicon carbide micro powder with a fineness of 1000 mesh. It has the characteristics of high hardness (Mohs 9-9.5), high temperature resistance of 1750℃, excellent wear resistance, stable chemical properties, high thermal conductivity, and low coefficient of expansion.

[0028] In this embodiment, the precipitated barium sulfate is selected from commercially available 800-mesh powder. It has advantages such as corrosion resistance, acid and alkali resistance, chemical stability, high hardness, and wear resistance.

[0029] In this embodiment, the talc powder is selected from commercially available 1200 mesh powder.

[0030] In the embodiments, the molybdenum disulfide, a ferrous metal powder, is an excellent solid lubricant material. It exhibits excellent lubricity for equipment under conditions of high temperature, low temperature, high load, high speed, chemical corrosion, and ultra-vacuum, significantly reducing the coefficient of friction and effectively reducing drag and preventing scaling.

[0031] In the embodiments, the dispersant is one or more of BYK-110, BYK-161, BYK-163 or BYK-atu manufactured by BYK Company.

[0032] In the embodiments, the leveling agent is one or more of BYK-306 and BYK-333 from BYK GmbH, Germany, and EFK-3600 from Efka GmbH.

[0033] In the embodiments, the defoamer is one or more of BYK-141, BYK-A530, BYK-058, etc. from BYK GmbH, Germany.

[0034] In the embodiments, the silane coupling agent is one of KH-550, KH-560, and KH-570.

[0035] In this embodiment, the anti-settling agent is selected as fumed silica powder.

[0036] In the embodiments, the thickener is selected as organobentonite.

[0037] In the embodiments, the catalyst is selected as dibutyltin dilaurate.

[0038] In the examples, the mixed solvent is a mixture of cyclohexanone, n-butanol, and butyl acetate in a ratio of 1:1:1.

[0039] The following detailed description is provided with reference to specific embodiments: Example 1: The composition and preparation method of a high-temperature resistant, wear-resistant, heavy-duty anti-corrosion coating for oil drilling tubing.

[0040] The composition of a high-temperature resistant, wear-resistant, heavy-duty anti-corrosion coating for oil drilling tubing: The coating consists of component A and component B: Composition of Component A: By mass percentage, it includes the following components: The composition includes: 45% epoxy resin E4, 5% boron phenolic resin, 30% graphene / titanium nanoparticle / alumina epoxy polymer, 4% liquid nitrile rubber, 6% rutile titanium dioxide, 5% green silicon carbide powder, 6% precipitated barium sulfate, 4% talc powder, 5% molybdenum disulfide powder, 0.5% fumed silica, 0.5% organobentonite, 0.5% dispersant, 0.2% defoamer, 0.3% leveling agent, and 28% mixed solvent.

[0041] Component B is T31 phenolic amine curing agent, with a mass fraction of 5%.

[0042] To address the aforementioned technical problems, this invention also provides a method for preparing a high-temperature resistant, wear-resistant, heavy-duty anti-corrosion coating for oil drilling tubing.

[0043] Step 1: Composition and preparation method of graphene / titanium nanoparticles / alumina epoxy polymer: Composition of graphene / titanium nanoparticle / alumina epoxy polymer: by mass percentage, it includes the following components: 35% bisphenol A type epoxy resin E44, 8% liquid nitrile rubber, 16% metallic titanium powder, 2% expanded graphite, 2% nano alumina, 0.1% silane coupling agent, 2% dispersant, 0.3% defoamer, 0.5% catalyst, and 34% solvent.

[0044] Preparation method of graphene / titanium nanoparticles / alumina epoxy polymer: Preparation is carried out in 3 steps: Step 1, freeze-drying expanded graphite powder: Freeze the expanded graphite powder in an environment of -20℃ for more than 12 hours, and set aside for later use; Step 2: Weigh the mixed solvent according to the formula and add it to the mixing tank. While stirring, add epoxy resin, dispersant, defoamer and organic bentonite. Stir until dissolved and uniform to prepare polymer solution. Step 3: The polymer solution, titanium powder, freeze-expanded graphite, and nano-alumina are loaded into the ball mill jar of a planetary ball mill, with a ball-to-material ratio of 4:1. The rotation speed is adjusted to 600 r / min, and the mixture is ground for 6 hours. The mixture is then poured into an ultrasonic oscillator and dispersed for 30 minutes. The particle size is between 50 nm and 80 nm, thus preparing a graphene / nano-titanium / alumina alloy epoxy polymer.

[0045] Step 2: Preparation of Component A Add the mixed solvent to the dispersion tank, and add epoxy resin, boron phenolic resin, and toughening agent under medium-low speed stirring. Stir until uniform, then add dispersant, defoamer, pigments and fillers, and disperse at high speed for 30 minutes. Grind the mixture to a fineness of 20 μm using a sand mill to obtain a pigment paste. Pour the pigment paste into a paint mixing tank, and add graphene / titanium nanoparticle / alumina epoxy polymer, anti-settling agent, thickener, and leveling agent under medium speed stirring. Stir for 30 minutes, then filter and package.

[0046] Component B: Weighing and packaging.

[0047] Construction mix proportion: The mass fraction ratio of component A to component B is 100:5 Curing conditions: After the steel pipe is coated by spraying, dipping or other methods, it is kept at 70℃ for 0.5h; then the temperature is raised to 107℃ and kept for 0.5h; then the temperature is raised to 140℃ and kept for 0.5h; finally, the temperature is raised to 170℃ and cured for 2h.

[0048] Example 2: The composition and preparation method of a high-temperature resistant, wear-resistant, heavy-duty anti-corrosion coating for oil drilling tubing.

[0049] The composition of a high-temperature resistant, wear-resistant, heavy-duty anti-corrosion coating for oil drilling tubing: The coating consists of component A and component B: Composition of Component A: By mass percentage, it includes the following components: The composition includes: 46% epoxy resin E4, 8% boron phenolic resin, 25% graphene / titanium nanoparticle / alumina epoxy polymer, 4% liquid nitrile rubber, 5% rutile titanium dioxide, 4% green silicon carbide powder, 4% precipitated barium sulfate, 5% talc, 4% molybdenum disulfide powder, 0.8% fumed silica, 0.8% organobentonite, 1% dispersant, 0.3% defoamer, 0.4% leveling agent, and 32% mixed solvent.

[0050] Component B is T31 phenolic amine curing agent, with a mass fraction of 5%.

[0051] To address the aforementioned technical problems, this invention also provides a method for preparing a high-temperature resistant, wear-resistant, heavy-duty anti-corrosion coating for oil drilling tubing.

[0052] Step 1: Composition and preparation method of graphene / titanium nanoparticles / alumina epoxy polymer: Composition of titanium graphene / titanium nanoparticle / alumina epoxy polymer: by mass percentage, it includes the following components: bisphenol A type epoxy resin E4438%, liquid nitrile rubber 6%, metallic titanium powder 17%, expanded graphite 2%, nano alumina 1%, silane coupling agent 0.2%, dispersant 1.5%, defoamer 0.3%, catalyst 0.5%, and solvent 34%.

[0053] Preparation method of graphene / titanium nanoparticles / alumina epoxy polymer: same as in Example 1.

[0054] Step 2: Preparation of component A, same as in Example 1.

[0055] Component B: Weighing and packaging.

[0056] Construction mix proportion: The mass fraction ratio of component A to component B is 100:5 Curing conditions: After the steel pipe is coated by spraying, dipping or other methods, it is kept at 70℃ for 0.5h; then the temperature is raised to 107℃ and kept for 0.5h; then the temperature is raised to 140℃ and kept for 0.5h; finally, the temperature is raised to 170℃ and cured for 2h.

[0057] Example 3: The composition and preparation method of a high-temperature resistant, wear-resistant, heavy-duty anti-corrosion coating for oil drilling tubing.

[0058] The composition of a high-temperature resistant, wear-resistant, heavy-duty anti-corrosion coating for oil drilling tubing: The coating consists of component A and component B: Composition of Component A: By mass percentage, it includes the following components: The composition includes: 47% epoxy resin E4, 7% boron phenolic resin, 20% graphene / titanium nanoparticle / alumina epoxy polymer, 5% liquid nitrile rubber, 6% rutile titanium dioxide, 5% green silicon carbide powder, 5% precipitated barium sulfate, 4% talc powder, 5% molybdenum disulfide powder, 0.6% fumed silica, 0.6% organobentonite, 0.3% silane coupling agent, 1.2% dispersant, 0.3% defoamer, 0.4% leveling agent, and 33% mixed solvent.

[0059] Component B is T31 phenolic amine curing agent, with a mass fraction of 5%.

[0060] To address the aforementioned technical problems, this invention also provides a method for preparing a high-temperature resistant, wear-resistant, heavy-duty anti-corrosion coating for oil drilling tubing.

[0061] Step 1: Composition and preparation method of graphene / titanium nanoparticles / alumina epoxy polymer: Composition of graphene / titanium nanoparticle / alumina epoxy polymer: by mass percentage, it includes the following components: bisphenol A type epoxy resin E4436%, liquid nitrile rubber 6%, metallic titanium powder 16%, expanded graphite 3%, nano alumina 1%, silane coupling agent 0.3%, dispersant 1.7%, defoamer 0.5%, catalyst 0.5%, and solvent 35%.

[0062] Preparation method of graphene / titanium nanoparticles / alumina epoxy polymer: same as in Example 1.

[0063] Step 2: Preparation of component A, same as in Example 1.

[0064] Component B: Weighing and packaging.

[0065] Construction mix proportion: The mass fraction ratio of component A to component B is 100:5 Curing conditions: After the steel pipe is coated by spraying, dipping or other methods, it is kept at 70℃ for 0.5h; then the temperature is raised to 107℃ and kept for 0.5h; then the temperature is raised to 140℃ and kept for 0.5h; finally, the temperature is raised to 170℃ and cured for 2h.

[0066] Example 4: The composition and preparation method of a high-temperature resistant, wear-resistant, heavy-duty anti-corrosion coating for oil drilling tubing.

[0067] The composition of a high-temperature resistant, wear-resistant, heavy-duty anti-corrosion coating for oil drilling tubing: The coating consists of component A and component B: Composition of Component A: By mass percentage, it includes the following components: The composition includes: 48% epoxy resin E4, 8% boron phenolic resin, 18% graphene / titanium nanoparticle / alumina epoxy polymer, 4% liquid nitrile rubber, 6% rutile titanium dioxide, 4% green silicon carbide powder, 6% precipitated barium sulfate, 7% talc, 4% molybdenum disulfide powder, 1% fumed silica, 0.5% organobentonite, 1.2% dispersant, 0.5% defoamer, 0.4% leveling agent, and 32% mixed solvent.

[0068] Component B is T31 phenolic amine curing agent, with a mass fraction of 5%.

[0069] To address the aforementioned technical problems, this invention also provides a method for preparing a high-temperature resistant, wear-resistant, heavy-duty anti-corrosion coating for oil drilling tubing.

[0070] Step 1: Composition and preparation method of graphene / titanium nanoparticles / alumina epoxy polymer: The composition of the titanium nano-epoxy polymer, by mass percentage, includes the following components: 38% bisphenol A type epoxy resin E44, 5% liquid nitrile rubber, 12% metallic titanium powder, 3% expanded graphite, 3% nano-alumina, 0.4% silane coupling agent, 1.2% dispersant, 0.3% defoamer, 0.6% catalyst, and 37% solvent.

[0071] Preparation method of titanium nano-epoxy polymer: same as in Example 1.

[0072] Step 2: Preparation of component A, same as in Example 1.

[0073] Component B: Weighing and packaging.

[0074] Construction mix proportion: The mass fraction ratio of component A to component B is 100:5 Curing conditions: After the steel pipe is coated by spraying, dipping or other methods, it is kept at 70℃ for 0.5h; then the temperature is raised to 107℃ and kept for 0.5h; then the temperature is raised to 140℃ and kept for 0.5h; finally, the temperature is raised to 170℃ and cured for 2h.

[0075] Example 5: The composition and preparation method of a high-temperature resistant, wear-resistant, heavy-duty anti-corrosion coating for oil drilling tubing.

[0076] The composition of a high-temperature resistant, wear-resistant, heavy-duty anti-corrosion coating for oil drilling tubing: The coating consists of component A and component B: Composition of Component A: By mass percentage, it includes the following components: The composition includes: 48% epoxy resin E4, 7% boron phenolic resin, 20% graphene / titanium nanoparticle / alumina epoxy polymer, 5% liquid nitrile rubber, 5% rutile titanium dioxide, 5% green silicon carbide powder, 5% precipitated barium sulfate, 6% talc, 5% molybdenum disulfide powder, 0.5% fumed silica, 1% organobentonite, 1% dispersant, 0.3% defoamer, 0.4% leveling agent, and 31% mixed solvent.

[0077] Component B is T31 phenolic amine curing agent, with a mass fraction of 5%.

[0078] To address the aforementioned technical problems, this invention also provides a method for preparing a high-temperature resistant, wear-resistant, heavy-duty anti-corrosion coating for oil drilling tubing.

[0079] Step 1: Composition and preparation method of graphene / titanium nanoparticles / alumina epoxy polymer: Composition of graphene / titanium nanoparticle / alumina epoxy polymer: by mass percentage, it includes the following components: bisphenol A type epoxy resin E4440%, liquid nitrile rubber 6%, metallic titanium powder 10%, expanded graphite 4%, nano alumina 2%, silane coupling agent 0.5%, dispersant 0.8%, defoamer 0.3%, catalyst 0.6%, and solvent 36%.

[0080] Preparation method of graphene / titanium nanoparticles / alumina epoxy polymer: same as in Example 1.

[0081] Step 2: Preparation of component A, same as in Example 1.

[0082] Component B: Weighing and packaging.

[0083] Construction mix proportion: The mass fraction ratio of component A to component B is 100:5 Curing conditions: After the steel pipe is coated by spraying, dipping or other methods, it is kept at 70℃ for 0.5h; then the temperature is raised to 107℃ and kept for 0.5h; then the temperature is raised to 140℃ and kept for 0.5h; finally, the temperature is raised to 170℃ and cured for 2h.

[0084] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-temperature resistant, wear-resistant, heavy-duty anti-corrosion coating for oil drilling tubing, characterized in that: The coating comprises component A and component B by weight percentage; The composition of component A, by mass percentage, includes the following components: epoxy resin 5-10%, boron phenolic resin 5-10%, graphene / titanium nano / nano alumina epoxy polymer 10-30%, toughening agent 3-8%, rutile titanium dioxide 4-8%, silicon carbide powder 3-6%, precipitated barium sulfate 5-10%, talc powder 5-10%, molybdenum disulfide powder 3-8%, anti-settling agent 0.5-1%, thickener 0.5-1%, dispersant 0.5-1%, defoamer 0.2-0.5%, leveling agent 0.3-0.5%, and mixed solvent 25-35%. Component B is T31 phenolic amine curing agent.

2. The high-temperature resistant, wear-resistant, heavy-duty anti-corrosion coating for oil drilling tubing according to claim 1, characterized in that: The graphene / titanium nano / nano alumina epoxy polymer composition, by mass percentage, includes the following components: 30-50% bisphenol A type epoxy resin, 5-10% liquid nitrile rubber, 10-20% metallic titanium powder, 2-5% expanded graphite, 1-2% nano alumina, 0.1-0.5% silane coupling agent, 1-2% dispersant, 0.3-0.5% defoamer, 0.5-1% catalyst, and 30-40% solvent.

3. The preparation method of a high-temperature resistant, wear-resistant, heavy-duty anti-corrosion coating for oil drilling tubing according to claim 2, characterized in that, Preparation of component A: Step 1: Add mixed solvent to the dispersion tank, add epoxy resin, boron phenolic resin and toughening agent under medium and low speed stirring, mix evenly, add dispersant, defoamer and pigments and fillers, disperse at high speed for 30 minutes, grind to fineness of 20um in a sand mill to obtain pigment paste; Step 2: Transfer the pigment paste into the paint mixing tank, add the anti-settling agent, thickener, graphene / titanium nano / nano alumina epoxy polymer, and leveling agent under medium-speed stirring, stir for 30 minutes, filter, and package.

4. The preparation method of a high-temperature resistant, wear-resistant, heavy-duty anti-corrosion coating for oil drilling tubing according to claim 3, characterized in that, Preparation of component B: Step 1: Implement the construction mix proportion, with a mass ratio of component A: component B = 100:5 Step 2: Perform the curing process. After the steel pipe is coated by spraying or dip coating, it is kept at a constant temperature of 70°C for 0.5 hours. Step 3: Next, raise the temperature to 107℃ and maintain it for 0.5 hours; Step 4: Then raise the temperature to 140℃ and maintain it for 0.5 hours; Step 5: Finally, raise the temperature to 170℃ and cure for 2 hours.

5. The preparation method of a high-temperature resistant, wear-resistant, heavy-duty anti-corrosion coating for oil drilling tubing according to claim 2, characterized in that: Preparation method of graphene / titanium nano / nano-alumina epoxy polymer: Step 1: Freeze-treating expanded graphite powder: Freeze the expanded graphite at -20℃ for more than 12 hours, and set aside for later use; Step 2: Weigh the ingredients according to the proportion and inject the mixed solvent into the mixing tank. During the stirring process, add epoxy resin, dispersant, defoamer and organic bentonite in sequence, and stir thoroughly until they are evenly dissolved to obtain a polymer solution. Step 3: Load the polymer solution, titanium powder, freeze-expanded graphite, and nano-alumina into the ball mill jar of a planetary ball mill, control the ball-to-material ratio at 4:1, set the rotation speed at 600 r / min, grind for 6 hours, and then pour it into an ultrasonic oscillator to disperse for 30 minutes to obtain a graphene / nano-titanium / alumina epoxy polymer with a particle size between 50 nm and 80 nm.