Wear-resistant anticorrosive paint and preparation method thereof

Abstract

The invention belongs to the technical field of coating preparation, and particularly relates to a wear-resistant anticorrosive coating and a preparation method thereof. The wear-resistant anticorrosive paint is composed of a component A and a component B, and the weight ratio of the component A to the component B is 10: 1. The component A is prepared from the following raw materials: quaternary fluorocarbon resin, hydroxyl-terminated perfluoropolyether resin, hydrogenated bisphenol A epoxy resin, polyperfluoromethyl isopropyl ether, di-n-butyltin dilaurate, dimethyl carbonate, methyl isobutyl ketone, modified sillimanite, a mixture of nano chromium diboride and basic magnesium sulfate whiskers, trifluoropropyl methyl silicone oil and polyamide wax; and the component B is a hexamethylene diisocyanate tripolymer. According to the wear-resistant anticorrosive paint disclosed by the invention, the raw materials have a synergistic effect, so that the prepared paint is excellent in salt spray resistance and acid and alkali resistance and relatively low in wet friction coefficient and wear rate.

Description

Technical Field

[0001] The present invention belongs to the technical field of coating preparation, and particularly relates to a wear-resistant and anti-corrosion coating and a preparation method thereof. Background Art

[0002] The sucker rod is an important component of the rod pumping equipment. It transmits the power of the pumping unit to the downhole sucker pump. When the rod and the tubing come into contact, relative movement causes wear between the sucker rod and the tubing, which is called eccentric wear. Eccentric wear wears the sucker rod, reduces its strength, causes the sucker rod to break, wears through the tubing wall, affects the normal operation of the oil well, and brings great economic losses to the oilfield.

[0003] During the oil extraction process, the medium environment of the sucker rod in the oil well belongs to a harsh environment with "high temperature, high salinity, high water content" and associated corrosion media such as CO2, H2S gas, and bacteria. "High temperature, high salinity, and high water content" all play a catalytic and promoting role in the corrosion reaction rate. High Cl - content provides the conditions and opportunities for pitting corrosion of the sucker rod. Therefore, it is easy to form a large cathode-small anode area ratio structure on the outer surface of the sucker rod, forming a closed cathode-anode circuit. As time goes by, the corrosion reaction rate and the proportion of the corrosion area are increased, and over time, the sucker rod is corroded and broken.

[0004] In order to improve the wear resistance and corrosion resistance of the sucker rod, surface coating technology is usually used to modify it. The commonly used coating types include epoxy resin coatings, inorganic ceramic coatings, polyurethane / polytetrafluoroethylene coatings, and graphene composite coatings. The epoxy resin coatings have relatively large brittleness after curing, and are prone to cracking or delamination due to the reciprocating movement of the sucker rod. The inorganic ceramic coatings have strict requirements for the surface treatment of the substrate, and are prone to cracks due to mechanical impact or deformation, resulting in accelerated local corrosion. The polyurethane / polytetrafluoroethylene coatings have insufficient wear resistance, and the graphene composite coatings have insufficient durability in high salinity environments. Therefore, it is necessary to explore a new type of wear-resistant and anti-corrosion coating. Summary of the Invention

[0005] The purpose of the present invention is to provide a wear-resistant and anti-corrosion coating, and the prepared coating has corrosion resistance and wear resistance. The present invention also provides a preparation method of the wear-resistant and anti-corrosion coating.

[0006] The wear-resistant and anticorrosive coating described in the present invention is composed of component A and component B. The weight ratio of component A to component B is 10:1. Component A, by weight parts, is composed of the following raw materials: 30-32 parts of quaternary fluorocarbon resin, 10-12 parts of hydroxyl-terminated perfluoropolyether resin, 13-15 parts of hydrogenated bisphenol A epoxy resin, 3-5 parts of perfluoromethyl isopropyl ether, 0.05 part of dibutyltin dilaurate, 10-10.5 parts of dimethyl carbonate, 3-3.5 parts of methyl isobutyl ketone, 15-17 parts of a mixture of modified sillimanite, nano chromium diboride and basic magnesium sulfate whiskers, 0.2-0.4 part of trifluoropropyl methyl silicone oil, and 0.8-1.0 part of polyamide wax; Component B is hexamethylene diisocyanate trimer.

[0007] Among them: The preparation method of the quaternary fluorocarbon resin consists of the following steps: First, evacuate and purge the high-pressure reactor with argon to keep the high-pressure reactor in an anhydrous and oxygen-free environment. Then, control the pressure of the high-pressure reactor to 1.5 MPa. First, add a solvent thereto. The solvent is a mixture of 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether and xylene. Then, add 1-octene-3-ol acetate, 4-hydroxybutyl vinyl ether, itaconic acid, and azobisisobutyronitrile. Subsequently, introduce chlorotrifluoroethylene gas into the high-pressure reactor and react at 73-75 °C for 7 h. After the reactor is cooled to room temperature, depressurize and discharge the unreacted chlorotrifluoroethylene gas. Precipitate the obtained liquid with ethanol and filter it. After Soxhlet extraction and drying, the quaternary fluorocarbon resin is prepared.

[0008] In the preparation method of the quaternary fluorocarbon resin, the molar ratio of chlorotrifluoroethylene, 4-hydroxybutyl vinyl ether, itaconic acid, and 1-octene-3-ol acetate is 50:30:10:10.

[0009] In the preparation method of the quaternary fluorocarbon resin, the mass of azobisisobutyronitrile accounts for 0.7% of the total mass of chlorotrifluoroethylene, 4-hydroxybutyl vinyl ether, itaconic acid, and 1-octene-3-ol acetate.

[0010] In the preparation method of the quaternary fluorocarbon resin, the volume of the solvent accounts for 60% of the total volume of 4-hydroxybutyl vinyl ether, itaconic acid, 1-octene-3-ol acetate, azobisisobutyronitrile, and the solvent.

[0011] In the preparation method of the quaternary fluorocarbon resin, the volume ratio of 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether to xylene is 3:1.

[0012] The manufacturer of the hydroxyl-terminated perfluoropolyether resin is Kaimei Chemical Technology (Nantong) Co., Ltd., the model is FB-800, the fluorine content is 42%, the functionality is 2, and the viscosity at 25 °C is 600 mPa·s.

[0013] A preparation method of a mixture of modified sillimanite, nano chromium diboride, and basic magnesium sulfate whiskers, which consists of the following steps: Mix ethanol and deionized water to prepare a mixed solution, add KH-550 silane coupling agent, stir at a speed of 600 r / min for 1.0 h, then add a mixture of sillimanite powder, nano chromium diboride, and basic magnesium sulfate whiskers and perform high-speed shearing for 50 min, react at 55 °C for 3 h and then perform vacuum filtration, and finally perform drying treatment under vacuum conditions to prepare a mixture of modified sillimanite, nano chromium diboride, and basic magnesium sulfate whiskers.

[0014] Among them: The volume ratio of KH-550 silane coupling agent, ethanol, and deionized water is 5:18:2.

[0015] The mass of KH-550 silane coupling agent accounts for 2.0% of the total mass of sillimanite powder, nano chromium diboride, and basic magnesium sulfate whiskers.

[0016] The mass ratio of sillimanite powder, nano chromium diboride, and basic magnesium sulfate whiskers is 3:0.9 - 1.1:0.8 - 1.0.

[0017] During the preparation process of the mixture of modified sillimanite, nano chromium diboride, and basic magnesium sulfate whiskers, the vacuum drying temperature is 70 °C and the vacuum drying time is 3 h.

[0018] The preparation method of the wear-resistant and corrosion-resistant coating described in the present invention consists of the following steps: (1) First, mix hydrogenated bisphenol A epoxy resin, dimethyl carbonate, and methyl isobutyl ketone, then add tetrafluorocarbon resin, hydroxyl-terminated perfluoropolyether resin, and perfluoromethyl isopropyl ether for co-blending, then add a mixture of modified sillimanite, nano chromium diboride, and basic magnesium sulfate whiskers and perform high-speed dispersion for 23 - 25 min, add polyamide wax and dibutyltin dilaurate and mix for 1.5 h, and finally add trifluoropropylmethyl silicone oil and stir for 3 - 5 min to prepare Component A; (2) Mix Component A and Component B according to a weight ratio of 10:1 to prepare a wear-resistant and corrosion-resistant coating.

[0019] Among them: When preparing Component A in step (1), the stirring speed is 700 r / min.

[0020] In step (2), the stirring speed is 800 r / min, the stirring time is 25 - 27 min, and the stirring temperature is 25 °C.

[0021] After spraying the wear-resistant and corrosion-resistant coating in step (2), it is cured at room temperature for 36 h.

[0022] Compared with the prior art, the present invention has the following beneficial effects: (1)The wear-resistant and anti-corrosion coating of the present invention uses a quaternary fluorocarbon resin, a hydroxyl-terminated perfluoropolyether resin, a hydrogenated bisphenol A epoxy resin, and perfluoromethyl isopropyl ether as the main components for compounding. The molecular chain of the quaternary fluorocarbon resin contains active groups such as hydroxyl and carboxyl groups. These groups can undergo an addition reaction with the isocyanate group -NCO of the HDI trimer to form a urethane bond cross-linking network, thereby achieving coating curing. Its fluorocarbon chain segments impart high corrosion resistance and hydrophobicity to the coating, and the rigid structure of the quaternary fluorocarbon resin makes the anti-corrosion coating have good mechanical properties. The hydroxyl groups at the ends of the hydroxyl-terminated perfluoropolyether resin can react with component B to form a three-dimensional cross-linking network, improving the mechanical strength and adhesion of the coating. Moreover, the low-friction characteristic of the hydroxyl-terminated perfluoropolyether resin can reduce the surface wear of the anti-corrosion coating. In addition, the hydroxyl groups undergo physical adsorption on the surface of the metal substrate, enhancing the adhesion between the coating and the substrate, enabling the anti-corrosion layer to adhere more firmly to the surface of the metal substrate, not easily falling off or cracking, and ensuring the stability of the anti-corrosion effect. The hydrogenated bisphenol A epoxy resin has good flexibility and impact resistance. It can interact with other components such as the quaternary fluorocarbon resin to form a network structure with excellent toughness in the coating, making the modified fluorocarbon anti-corrosion layer not only have good hardness and wear resistance but also be able to resist the influence of external mechanical stress to a certain extent, avoiding the decline of the coating's anti-corrosion performance due to coating brittle fracture. Perfluoromethyl isopropyl ether can provide fluorine elements and ether bond groups. The presence of its ether bonds makes the modified fluorocarbon anti-corrosion layer have a low surface energy, which helps to reduce the adhesion of pollutants such as dirt and oil on the coating surface, thereby enhancing the durability and effectiveness of the anti-corrosion layer. It is dispersed in the coating, filling the micropore defects of other resins and enhancing the denseness of the coating. Thus, the lubricity of the hydroxyl-terminated perfluoropolyether resin and the toughness of the hydrogenated bisphenol A epoxy resin jointly improve the wear resistance. The low surface tension of perfluoromethyl isopropyl ether promotes the uniform dispersion of other components, reduces the coating pores, and the rigid structure of the quaternary fluorocarbon resin supports the compressive strength of the coating, forming a wear-resistant system of "combining rigidity with flexibility". The interaction of the four makes the coating have a dense structure, and due to the high fluorine content of the coating, the wear resistance and anti-corrosion performance of the prepared coating are fundamentally guaranteed. Using dimethyl carbonate and methyl isobutyl ketone as solvents, the compounding of the two avoids the appearance of pinholes in the paint film caused by the too-fast evaporation of a single solvent and can prevent the sagging phenomenon when methyl isobutyl ketone is used alone, achieving a balance between spraying leveling and curing speed. Using trifluoropropyl methyl silicone oil as an antifoaming agent, polyamide wax as a leveling agent, and a mixture of modified sillimanite, chromium diboride, and basic magnesium sulfate whiskers as fillers to improve the wear resistance of the coating. Thus, the synergistic effect between the raw materials ensures the corrosion resistance and wear resistance of the prepared wear-resistant and anti-corrosion coating.

[0023] (2) The wear-resistant and anti-corrosion coating of the present invention uses a mixture of modified sillimanite, chromium diboride, and basic magnesium sulfate whiskers as fillers. The unique crystal structure of sillimanite forms a rigid framework in the coating, which can resist the embedding and plowing effects of abrasive particles during the friction process. The crystal structure of chromium diboride forms hard wear-resistant particles in the coating to directly resist mechanical wear and abrasive cutting. The basic magnesium sulfate whisker is a needle-shaped single crystal fiber, and its high aspect ratio forms a three-dimensional network structure in the coating to inhibit crack propagation through crack bridging, deflection, and pull-out effects. Thus, the three act synergistically to further improve the wear resistance of the coating.

[0024] (3) For the wear-resistant and anti-corrosion coating of the present invention, when preparing the quaternary fluorocarbon resin, 1-octen-3-yl acetate, 4-hydroxybutyl vinyl ether, itaconic acid, and trichloroethylene are used as raw materials. Trichloroethylene, as a fluorine-containing monomer, forms a rigid structure in the main chain of the molecule. The close arrangement of fluorine atoms on the outer layer of the carbon chain forms a "shielding effect" to block the erosion of acids, alkalis, and salt mists. Hydroxyl groups are introduced through 4-hydroxybutyl vinyl ether as crosslinking sites, and after reacting with the -NCO of HDI trimer, a dense three-dimensional network structure is formed. The carboxyl group of itaconic acid can enhance the compatibility between the prepared quaternary fluorocarbon resin and the filler, and at the same time improve the adhesion of the coating through hydrogen bonding. 1-octen-3-yl acetate makes the prepared quaternary fluorocarbon resin have a certain flexibility, and the improvement of flexibility can avoid the cracking of the coating due to internal stress. Thus, the four raw materials interact with each other. Through trichloroethylene, a rigid framework with a high fluorine content is provided to resist chemical erosion. 4-hydroxybutyl vinyl ether introduces crosslinking sites, itaconic acid enhances the polarity of the prepared quaternary fluorocarbon resin, and 1-octen-3-yl acetate ensures that the prepared quaternary fluorocarbon resin has a certain flexibility, so that the prepared quaternary fluorocarbon resin has excellent corrosion resistance.

[0025] (4) For the wear-resistant and anti-corrosion coating of the present invention, the raw materials act synergistically to ensure that the prepared coating has excellent salt spray resistance, acid and alkali resistance, low wet friction coefficient, and wear rate.

[0026] (5) The preparation method of the wear-resistant and anti-corrosion coating of the present invention has a simple process, easy-to-control parameters, can achieve room temperature curing, and the performance of the coating is stable after spraying. Detailed Embodiments

[0027] The present invention will be further described below in conjunction with embodiments.

[0028] Example 1 The wear-resistant and anticorrosive coating described in this Example 1 is composed of Component A and Component B. The weight ratio of Component A to Component B is 10:1. Component A, by weight parts, is composed of the following raw materials: 31 parts of quaternary fluorocarbon resin, 11 parts of hydroxyl-terminated perfluoropolyether resin, 14 parts of hydrogenated bisphenol A epoxy resin, 4 parts of perfluoromethyl isopropyl ether, 0.05 part of dibutyltin dilaurate, 10.3 parts of dimethyl carbonate, 3.3 parts of methyl isobutyl ketone, 16 parts of a mixture of modified sillimanite, nano chromium diboride, and basic magnesium sulfate whiskers, 0.3 part of trifluoropropyl methyl silicone oil, and 0.9 part of polyamide wax; Component B is hexamethylene diisocyanate trimer.

[0029] Among them: The preparation method of the quaternary fluorocarbon resin consists of the following steps: First, evacuate and purge the high-pressure reactor with argon to keep the high-pressure reactor in an anhydrous and oxygen-free environment. Then, control the pressure of the high-pressure reactor to 1.5 MPa. First, add a solvent thereto. The solvent is a mixture of 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether and xylene. Then, add 1-octene-3-ol acetate, 4-hydroxybutyl vinyl ether, itaconic acid, and azobisisobutyronitrile. Subsequently, introduce chlorotrifluoroethylene gas into the high-pressure reactor and react at 74 °C for 7 h. After the reactor is cooled to room temperature, reduce the pressure and discharge the unreacted chlorotrifluoroethylene gas. The obtained liquid is precipitated with ethanol and filtered, and then prepared into quaternary fluorocarbon resin through Soxhlet extraction and drying.

[0030] In the preparation method of the quaternary fluorocarbon resin, the molar ratio of chlorotrifluoroethylene, 4-hydroxybutyl vinyl ether, itaconic acid, and 1-octene-3-ol acetate is 50:30:10:10.

[0031] In the preparation method of the quaternary fluorocarbon resin, the mass of azobisisobutyronitrile accounts for 0.7% of the sum of the masses of chlorotrifluoroethylene, 4-hydroxybutyl vinyl ether, itaconic acid, and 1-octene-3-ol acetate.

[0032] In the preparation method of the quaternary fluorocarbon resin, the volume of the solvent accounts for 60% of the sum of the volumes of 4-hydroxybutyl vinyl ether, itaconic acid, 1-octene-3-ol acetate, azobisisobutyronitrile, and the solvent.

[0033] In the preparation method of the quaternary fluorocarbon resin, the volume ratio of 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether to xylene is 3:1.

[0034] The manufacturer of the hydroxyl-terminated perfluoropolyether resin is Kaimei Chemical Technology (Nantong) Co., Ltd., the model is FB-800, the fluorine content is 42%, the functionality is 2, and the viscosity at 25 °C is 600 mPa·s.

[0035] Preparation method of a mixture of modified sillimanite, nano chromium diboride, and basic magnesium sulfate whiskers, which consists of the following steps: Mix ethanol and deionized water to obtain a mixed solution, add KH-550 silane coupling agent, stir at a rotation speed of 600 r / min for 1.0 h, then add a mixture of sillimanite powder, nano chromium diboride, and basic magnesium sulfate whiskers and perform high-speed shearing for 50 min, react at 55 °C for 3 h, then perform vacuum filtration, and finally perform drying treatment under vacuum conditions to obtain a mixture of modified sillimanite, nano chromium diboride, and basic magnesium sulfate whiskers.

[0036] Among them: The volume ratio of KH-550 silane coupling agent, ethanol, and deionized water is 5:18:2.

[0037] The mass of KH-550 silane coupling agent accounts for 2.0% of the total mass of sillimanite powder, nano chromium diboride, and basic magnesium sulfate whiskers.

[0038] The mass ratio of sillimanite powder, nano chromium diboride, and basic magnesium sulfate whiskers is 3:1.0:0.9.

[0039] During the preparation process of the mixture of modified sillimanite, nano chromium diboride, and basic magnesium sulfate whiskers, the vacuum drying temperature is 70 °C, and the vacuum drying time is 3 h.

[0040] The preparation method of the wear-resistant and anti-corrosion coating described in Example 1 consists of the following steps: (1) First, mix hydrogenated bisphenol A epoxy resin, dimethyl carbonate, and methyl isobutyl ketone, then add tetrafluoro carbon resin, hydroxyl-terminated perfluoropolyether resin, and perfluoromethyl isopropyl ether for co-blending, then add a mixture of modified sillimanite, nano chromium diboride, and basic magnesium sulfate whiskers and perform high-speed dispersion for 24 min, add polyamide wax and dibutyltin dilaurate and mix for 1.5 h, and finally add trifluoropropyl methyl silicone oil and stir for 4 min to obtain Component A; (2) Mix Component A and Component B in a weight ratio of 10:1 to obtain a wear-resistant and anti-corrosion coating.

[0041] Among them: When preparing Component A in step (1), the stirring rotation speed is 700 r / min.

[0042] In step (2), the stirring rotation speed is 800 r / min, the stirring time is 26 min, and the stirring temperature is 25 °C.

[0043] After spraying the wear-resistant and anti-corrosion coating in step (2), it is cured at room temperature for 36 h.

[0044] Example 2 The wear-resistant and anti-corrosive coating described in this Example 2 is composed of Component A and Component B. The weight ratio of Component A to Component B is 10:1. Component A, by weight parts, is composed of the following raw materials: 32 parts of quaternary fluorocarbon resin, 10 parts of hydroxyl-terminated perfluoropolyether resin, 13 parts of hydrogenated bisphenol A epoxy resin, 5 parts of perfluoromethyl isopropyl ether, 0.05 part of dibutyltin dilaurate, 10.5 parts of dimethyl carbonate, 3 parts of methyl isobutyl ketone, 17 parts of a mixture of modified sillimanite, nano chromium diboride, and basic magnesium sulfate whiskers, 0.2 part of trifluoropropyl methyl silicone oil, and 1.0 part of polyamide wax; Component B is hexamethylene diisocyanate trimer.

[0045] Among them: The preparation method of the quaternary fluorocarbon resin consists of the following steps: First, evacuate and purge the high-pressure reactor with argon to keep the high-pressure reactor in an anhydrous and oxygen-free environment. Then, control the pressure of the high-pressure reactor to 1.5 MPa. First, add a solvent to it. The solvent is a mixture of 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether and xylene. Then, add 1-octene-3-ol acetate, 4-hydroxybutyl vinyl ether, itaconic acid, and azobisisobutyronitrile. Subsequently, introduce chlorotrifluoroethylene gas into the high-pressure reactor and react at 75 °C for 7 h. After the reactor is cooled to room temperature, depressurize and discharge the unreacted chlorotrifluoroethylene gas. Precipitate the obtained liquid with ethanol and filter it. After Soxhlet extraction and drying, the quaternary fluorocarbon resin is prepared.

[0046] In the preparation method of the quaternary fluorocarbon resin, the molar ratio of chlorotrifluoroethylene, 4-hydroxybutyl vinyl ether, itaconic acid, and 1-octene-3-ol acetate is 50:30:10:10.

[0047] In the preparation method of the quaternary fluorocarbon resin, the mass of azobisisobutyronitrile accounts for 0.7% of the total mass of chlorotrifluoroethylene, 4-hydroxybutyl vinyl ether, itaconic acid, and 1-octene-3-ol acetate.

[0048] In the preparation method of the quaternary fluorocarbon resin, the volume of the solvent accounts for 60% of the total volume of 4-hydroxybutyl vinyl ether, itaconic acid, 1-octene-3-ol acetate, azobisisobutyronitrile, and the solvent.

[0049] In the preparation method of the quaternary fluorocarbon resin, the volume ratio of 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether to xylene is 3:1.

[0050] The manufacturer of the hydroxyl-terminated perfluoropolyether resin is Kaimei Chemical Technology (Nantong) Co., Ltd., the model is FB-800, the fluorine content is 42%, the functionality is 2, and the viscosity at 25 °C is 600 mPa·s.

[0051] A preparation method of a mixture of modified sillimanite, nano chromium diboride, and basic magnesium sulfate whiskers, which consists of the following steps: Mix ethanol and deionized water to prepare a mixed solution, add KH-550 silane coupling agent, stir at a rotation speed of 600 r / min for 1.0 h, then add a mixture of sillimanite powder, nano chromium diboride, and basic magnesium sulfate whiskers and perform high-speed shearing for 50 min, react at 55 °C for 3 h, then perform vacuum filtration, and finally perform drying treatment under vacuum conditions to prepare a mixture of modified sillimanite, nano chromium diboride, and basic magnesium sulfate whiskers.

[0052] Wherein: The volume ratio of KH-550 silane coupling agent, ethanol, and deionized water is 5:18:2.

[0053] The mass of KH-550 silane coupling agent accounts for 2.0% of the total mass of sillimanite powder, nano chromium diboride, and basic magnesium sulfate whiskers.

[0054] The mass ratio of sillimanite powder, nano chromium diboride, and basic magnesium sulfate whiskers is 3:1.1:0.8.

[0055] During the preparation of the mixture of modified sillimanite, nano chromium diboride, and basic magnesium sulfate whiskers, the vacuum drying temperature is 70 °C and the vacuum drying time is 3 h.

[0056] The preparation method of the wear-resistant and anticorrosive coating described in Example 2 consists of the following steps: (1) First, mix hydrogenated bisphenol A epoxy resin, dimethyl carbonate, and methyl isobutyl ketone, then add tetrafluorocarbon resin, hydroxyl-terminated perfluoropolyether resin, and perfluoromethyl isopropyl ether for co-blending, then add a mixture of modified sillimanite, nano chromium diboride, and basic magnesium sulfate whiskers and perform high-speed dispersion for 25 min, add polyamide wax and dibutyltin dilaurate and mix for 1.5 h, and finally add trifluoropropyl methyl silicone oil and stir for 5 min to prepare Component A; (2) Mix Component A and Component B in a weight ratio of 10:1 to prepare a wear-resistant and anticorrosive coating.

[0057] Wherein: During the preparation of Component A in step (1), the stirring rotation speed is 700 r / min.

[0058] In step (2), the stirring rotation speed is 800 r / min, the stirring time is 27 min, and the stirring temperature is 25 °C.

[0059] After spraying the wear-resistant and anticorrosive coating in step (2), it is cured at room temperature for 36 h.

[0060] Example 3 The wear-resistant and anticorrosive coating described in this Example 3 is composed of Component A and Component B. The weight ratio of Component A to Component B is 10:1. Component A, by weight parts, is composed of the following raw materials: 30 parts of quaternary fluorocarbon resin, 12 parts of hydroxyl-terminated perfluoropolyether resin, 15 parts of hydrogenated bisphenol A epoxy resin, 3 parts of perfluoromethyl isopropyl ether, 0.05 part of dibutyltin dilaurate, 10 parts of dimethyl carbonate, 3.5 parts of methyl isobutyl ketone, 15 parts of a mixture of modified sillimanite, nano chromium diboride, and basic magnesium sulfate whiskers, 0.4 part of trifluoropropyl methyl silicone oil, and 0.8 part of polyamide wax; Component B is hexamethylene diisocyanate trimer.

[0061] Among them: The preparation method of the quaternary fluorocarbon resin consists of the following steps: First, evacuate and purge the high-pressure reactor with argon to keep the high-pressure reactor in an anhydrous and oxygen-free environment. Then, control the pressure of the high-pressure reactor to be 1.5 MPa. First, add a solvent thereto. The solvent is a mixture of 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether and xylene. Then, add 1-octene-3-ol acetate, 4-hydroxybutyl vinyl ether, itaconic acid, and azobisisobutyronitrile. Subsequently, introduce chlorotrifluoroethylene gas into the high-pressure reactor and react at 73 °C for 7 h. After the reactor is cooled to room temperature, reduce the pressure and discharge the unreacted chlorotrifluoroethylene gas. The obtained liquid is precipitated with ethanol and filtered, and then prepared into the quaternary fluorocarbon resin through Soxhlet extraction and drying.

[0062] In the preparation method of the quaternary fluorocarbon resin, the molar ratio of chlorotrifluoroethylene, 4-hydroxybutyl vinyl ether, itaconic acid, and 1-octene-3-ol acetate is 50:30:10:10.

[0063] In the preparation method of the quaternary fluorocarbon resin, the mass of azobisisobutyronitrile accounts for 0.7% of the sum of the masses of chlorotrifluoroethylene, 4-hydroxybutyl vinyl ether, itaconic acid, and 1-octene-3-ol acetate.

[0064] In the preparation method of the quaternary fluorocarbon resin, the volume of the solvent accounts for 60% of the sum of the volumes of 4-hydroxybutyl vinyl ether, itaconic acid, 1-octene-3-ol acetate, azobisisobutyronitrile, and the solvent.

[0065] In the preparation method of the quaternary fluorocarbon resin, the volume ratio of 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether to xylene is 3:1.

[0066] The manufacturer of the hydroxyl-terminated perfluoropolyether resin is Chemay Chemical Technology (Nantong) Co., Ltd., the model is FB-800, the fluorine content is 42%, the functionality is 2, and the viscosity at 25 °C is 600 mPa·s.

[0067] Preparation method of a mixture of modified sillimanite, nano chromium diboride, and basic magnesium sulfate whiskers, which consists of the following steps: Mix ethanol and deionized water to prepare a mixed solution, add KH-550 silane coupling agent, stir at a speed of 600 r / min for 1.0 h, then add a mixture of sillimanite powder, nano chromium diboride, and basic magnesium sulfate whiskers and perform high-speed shearing for 50 min, react at 55 °C for 3 h, then perform vacuum filtration, and finally perform drying treatment under vacuum conditions to prepare a mixture of modified sillimanite, nano chromium diboride, and basic magnesium sulfate whiskers.

[0068] Among them: The volume ratio of KH-550 silane coupling agent, ethanol, and deionized water is 5:18:2.

[0069] The mass of KH-550 silane coupling agent accounts for 2.0% of the total mass of sillimanite powder, nano chromium diboride, and basic magnesium sulfate whiskers.

[0070] The mass ratio of sillimanite powder, nano chromium diboride, and basic magnesium sulfate whiskers is 3:0.9:1.0.

[0071] During the preparation of the mixture of modified sillimanite, nano chromium diboride, and basic magnesium sulfate whiskers, the vacuum drying temperature is 70 °C and the vacuum drying time is 3 h.

[0072] The preparation method of the wear-resistant and anticorrosive coating described in this Example 3 consists of the following steps: (1) First, mix hydrogenated bisphenol A epoxy resin, dimethyl carbonate, and methyl isobutyl ketone, then add tetrafluoro carbon resin, hydroxyl-terminated perfluoropolyether resin, and perfluoromethyl isopropyl ether for co-blending, then add a mixture of modified sillimanite, nano chromium diboride, and basic magnesium sulfate whiskers and perform high-speed dispersion for 23 min, add polyamide wax and dibutyltin dilaurate and mix for 1.5 h, and finally add trifluoropropyl methyl silicone oil and stir for 3 min to prepare Component A; (2) Mix Component A and Component B in a weight ratio of 10:1 to prepare a wear-resistant and anticorrosive coating.

[0073] Among them: When preparing Component A in step (1), the stirring speed is 700 r / min.

[0074] In step (2), the stirring speed is 800 r / min, the stirring time is 25 min, and the stirring temperature is 25 °C.

[0075] After spraying the wear-resistant and anticorrosive coating in step (2), it is cured at room temperature for 36 h.

[0076] Comparative Example 1 The preparation method of the wear-resistant and anti-corrosion coating described in Comparative Example 1 is the same as that in Example 1. The only difference is that the raw material composition of the wear-resistant and anti-corrosion coating is different from that in Example 1. The mixture of modified sillimanite, nano-chromium diboride, and basic magnesium sulfate whiskers in Component A is replaced by modified sillimanite. The preparation method of the modified sillimanite is the same as the method for preparing the mixture of modified sillimanite, nano-chromium diboride, and basic magnesium sulfate whiskers in Example 1.

[0077] Comparative Example 2 The preparation method of the wear-resistant and anti-corrosion coating described in Comparative Example 2 is the same as that in Example 1. The only difference is that the raw material composition of the wear-resistant and anti-corrosion coating is different from that in Example 1. The mixture of modified sillimanite, nano-chromium diboride, and basic magnesium sulfate whiskers in Component A is replaced by modified nano-chromium diboride. The preparation method of the modified nano-chromium diboride is the same as the method for preparing the mixture of modified sillimanite, nano-chromium diboride, and basic magnesium sulfate whiskers in Example 1.

[0078] Comparative Example 3 The preparation method of the wear-resistant and anti-corrosion coating described in Comparative Example 3 is the same as that in Example 1. The only difference is that the raw material composition of the wear-resistant and anti-corrosion coating is different from that in Example 1. The mixture of modified sillimanite, nano-chromium diboride, and basic magnesium sulfate whiskers in Component A is replaced by modified basic magnesium sulfate whiskers. The preparation method of the modified basic magnesium sulfate whiskers is the same as the method for preparing the mixture of modified sillimanite, nano-chromium diboride, and basic magnesium sulfate whiskers in Example 1.

[0079] Comparative Example 4 The preparation method of the wear-resistant and anti-corrosion coating described in Comparative Example 4 is the same as that in Example 1. The only difference is that the raw material composition of the wear-resistant and anti-corrosion coating is different from that in Example 1. The quaternary fluorocarbon resin is not added to the raw materials described in Comparative Example 4.

[0080] The wear-resistant and anti-corrosion coatings prepared in Examples 1-3 and Comparative Examples 1-4 were sprayed on the surface of sucker rods for performance testing. The results are shown in Table 1 below. Among them, the salt spray resistance performance test standard is GB / T 1771-2007, the acid and alkali resistance performance test standard is GB / T 9274-1988, the corrosion media are 10% H2SO4 solution and 10% NaOH solution respectively, the coating hardness test standard is GB / T 6739-2022, the coating adhesion test standard is GB / T 9286-2021, the coating impact resistance test standard is GB / T 1732-2020, and the coating friction and wear performance was evaluated by a linear reciprocating test using a CFT-I friction testing machine. The test used a ball-on-disk structure, a steel ball with a diameter of 4 mm, a load of 3 N, and wet friction was carried out at a constant speed of 400 r / min. Brine was injected into the friction interface to simulate a humid environment, and the test time was 30 min. Before the test, all friction pairs were cleaned several times with ethanol to remove surface impurities. Under the same conditions, each test was repeated 4 times.

[0081] Table 1 Performance test results of wear-resistant and anti-corrosion coatings in Examples 1-3 and Comparative Examples 1-4

Claims

1. A wear-resistant and anti-corrosion coating, characterized in that: It consists of Component A and Component B. The weight ratio of Component A to Component B is 10:

1. Component A, by weight parts, consists of the following raw materials: 30 - 32 parts of quaternary fluorocarbon resin, 10 - 12 parts of hydroxyl-terminated perfluoropolyether resin, 13 - 15 parts of hydrogenated bisphenol A epoxy resin, 3 - 5 parts of perfluoromethyl isopropyl ether, 0.05 part of dibutyltin dilaurate, 10 - 10.5 parts of dimethyl carbonate, 3 - 3.5 parts of methyl isobutyl ketone, 15 - 17 parts of a mixture of modified sillimanite, nano chromium diboride, and basic magnesium sulfate whiskers, 0.2 - 0.4 part of trifluoropropyl methyl silicone oil, and 0.8 - 1.0 part of polyamide wax; Component B is hexamethylene diisocyanate trimer.

2. The wear-resistant and corrosion-resistant coating according to claim 1, characterized in that: The preparation method of the quaternary fluorocarbon resin consists of the following steps: First, evacuate and purge the high-pressure reactor with argon to keep the high-pressure reactor in an anhydrous and oxygen-free environment. Then, control the pressure of the high-pressure reactor to 1.5 MPa. First, add a solvent to it. The solvent is a mixture of 1,1,2,2 - tetrafluoroethyl - 2,2,2 - trifluoroethyl ether and xylene. Then, add 1 - octene - 3 - ol acetate, 4 - hydroxybutyl vinyl ether, itaconic acid, and azobisisobutyronitrile. Subsequently, introduce chlorotrifluoroethylene gas into the high-pressure reactor and react at 73 - 75 °C for 7 h. After the reactor is cooled to room temperature, reduce the pressure and discharge the unreacted chlorotrifluoroethylene gas. Precipitate the obtained liquid with ethanol and filter it. After Soxhlet extraction and drying, the quaternary fluorocarbon resin is prepared.

3. The wear-resistant and anti-corrosion coating according to claim 2, wherein: In the preparation method of the quaternary fluorocarbon resin, the molar ratio of chlorotrifluoroethylene, 4 - hydroxybutyl vinyl ether, itaconic acid, and 1 - octene - 3 - ol acetate is 50:30:10:10; In the preparation method of the quaternary fluorocarbon resin, the mass of azobisisobutyronitrile accounts for 0.7% of the sum of the masses of chlorotrifluoroethylene, 4 - hydroxybutyl vinyl ether, itaconic acid, and 1 - octene - 3 - ol acetate.

4. The wear-resistant and anti-corrosion coating according to claim 2, wherein: In the preparation method of the quaternary fluorocarbon resin, the volume of the solvent accounts for 60% of the sum of the volumes of 4 - hydroxybutyl vinyl ether, itaconic acid, 1 - octene - 3 - ol acetate, azobisisobutyronitrile, and the solvent. In the preparation method of the quaternary fluorocarbon resin, the volume ratio of 1,1,2,2 - tetrafluoroethyl - 2,2,2 - trifluoroethyl ether to xylene is 3:

1.

5. The wear-resistant and anti-corrosion coating according to claim 1, characterized in that: The fluorine content of the hydroxyl-terminated perfluoropolyether resin is 42%, the functionality is 2, and the viscosity at 25 °C is 600 mPa·s.

6. The wear-resistant and anti-corrosion coating according to claim 1, wherein: The preparation method of the mixture of modified sillimanite, nano chromium diboride, and basic magnesium sulfate whiskers consists of the following steps: Mix ethanol and deionized water to obtain a mixed solution, add KH - 550 silane coupling agent, and stir at a speed of 600 r / min for 1.0 h. Then, add a mixture of sillimanite powder, nano chromium diboride, and basic magnesium sulfate whiskers and perform high-speed shearing for 50 min. React at 55 °C for 3 h and then perform vacuum filtration. Finally, perform drying treatment under vacuum conditions to prepare the mixture of modified sillimanite, nano chromium diboride, and basic magnesium sulfate whiskers.

7. The wear-resistant and corrosion-resistant coating according to claim 6, wherein: The volume ratio of KH - 550 silane coupling agent, ethanol, and deionized water is 5:18:2; The mass of KH-550 silane coupling agent accounts for 2.0% of the total mass of sillimanite powder, nano-chromium diboride, and basic magnesium sulfate whiskers; The mass ratio of sillimanite powder, nano-chromium diboride, and basic magnesium sulfate whiskers is 3: 0.9 - 1.1: 0.8 - 1.0; During the preparation of the mixture of modified sillimanite, nano-chromium diboride, and basic magnesium sulfate whiskers, the vacuum drying temperature is 70 °C and the vacuum drying time is 3 h.

8. A method for preparing the wear-resistant and anti-corrosion coating according to claim 1, characterized in that: It consists of the following steps: (1) First, mix hydrogenated bisphenol A epoxy resin, dimethyl carbonate, and methyl isobutyl ketone, then add tetrafluorocarbon resin, hydroxyl-terminated perfluoropolyether resin, and perfluoromethyl isopropyl ether for blending. Subsequently, add the mixture of modified sillimanite, nano-chromium diboride, and basic magnesium sulfate whiskers and disperse at high speed for 23 - 25 min. Add polyamide wax and dibutyltin dilaurate and mix for 1.5 h. Finally, add trifluoropropylmethyl silicone oil and stir for 3 - 5 min to prepare Component A; (2) Mix Component A and Component B in a weight ratio of 10:1 to prepare the wear-resistant and anticorrosive coating.

9. The preparation method of the wear-resistant and anti-corrosion coating according to claim 8, characterized in that: The stirring speed in step (1) when preparing Component A is 700 r / min; In step (2), the stirring speed is 800 r / min, the stirring time is 25 - 27 min, and the stirring temperature is 25 °C.

10. The preparation method of the wear-resistant and anti-corrosion coating according to claim 8, characterized in that: After spraying the wear-resistant and anticorrosive coating in step (2), it is cured at room temperature for 36 h.

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