Wear-resistant and anti-corrosion coating and preparation method thereof

Abstract

The present invention belongs to the technical field of coating preparation, and specifically relates to a wear-resistant and anti-corrosion coating and a preparation method thereof. The wear-resistant and anti-corrosion coating is composed of component A and component B, and the weight ratio of component A to component B is 10:1. Component A is composed of the following raw materials: quaternary fluorocarbon resin, terminal hydroxyl perfluoropolyether resin, hydrogenated bisphenol A epoxy resin, polyperfluoromethyl isopropyl ether, di-n-butyltin dilaurate, dimethyl carbonate, methyl isobutyl ketone, modified sillimanite, nano-chromium diboride and a mixture of basic magnesium sulfate whiskers, trifluoropropyl methyl silicone oil and polyamide wax; component B is hexamethylene diisocyanate trimer. The wear-resistant and anti-corrosion coating described in the present invention has a synergistic effect between the raw materials, ensuring that the prepared coating has excellent salt spray resistance, acid and alkali resistance, and a low wet friction coefficient and wear rate.

Description

Technical Field

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

[0002] The sucker rod is a critical component of rod-type pumping equipment. It transmits power to the downhole pump. When the rod and tubing come into contact, relative motion causes wear between the rod and tubing, a condition known as eccentric wear. This wear reduces the rod's strength, leading to rod breakage and wear through the tubing wall, disrupting the normal operation of the well and causing significant economic losses to the oilfield.

[0003] During the oil extraction process, the medium environment of the pumping well where the sucker rod is located is a harsh environment with "high temperature, high mineralization, high water content" and is accompanied by corrosive media such as CO2 and H2S gases and bacteria. "High temperature, high mineralization, and high water content" all play a catalytic role in promoting the corrosion reaction rate. - High levels of ferrous metals create conditions and opportunities for pitting corrosion in the rods. Consequently, a large cathode-to-anode area structure is likely to form on the rod's outer surface, creating a closed anode-to-cathode loop. Over time, this exacerbates the corrosion reaction rate and the proportion of the corroded area, eventually corroding the rod.

[0004] To improve the wear and corrosion resistance of sucker rods, surface coatings are often used to modify them. Commonly used coating types include epoxy resin coatings, inorganic ceramic coatings, polyurethane / PTFE coatings, and graphene composite coatings. Epoxy resin coatings are brittle after curing and are prone to cracking or delamination due to the reciprocating motion of the sucker rod. Inorganic ceramic coatings require stringent surface preparation and are prone to cracking due to mechanical impact or deformation, leading to accelerated localized corrosion. Polyurethane / PTFE coatings lack wear resistance, and graphene composite coatings lack durability in highly mineralized environments. Therefore, it is necessary to explore new wear-resistant and anti-corrosion coatings. Summary of the Invention

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

[0006] The wear-resistant and anti-corrosion coating of the present invention is composed of component A and component B, wherein the weight ratio of component A to component B is 10:1. Component A is composed of the following raw materials in parts by weight: 30-32 parts of quaternary fluorocarbon resin, 10-12 parts of terminal hydroxyl perfluoropolyether resin, 13-15 parts of hydrogenated bisphenol A epoxy resin, 3-5 parts of polyperfluoromethyl isopropyl ether, 0.05 parts of di-n-butyltin 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 parts of trifluoropropyl methyl silicone oil and 0.8-1.0 parts of polyamide wax; and component B is hexamethylene diisocyanate trimer.

[0007] The preparation method of the quaternary fluorocarbon resin comprises the following steps: first, evacuating the autoclave and passing argon gas to maintain an anhydrous and oxygen-free environment in the autoclave; then controlling the pressure of the autoclave to 1.5 MPa; first adding a solvent thereto, wherein the solvent is a mixture of 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether and xylene; then adding 1-octen-3-ol acetate, 4-hydroxybutyl vinyl ether, itaconic acid and azobisisobutyronitrile; then passing trifluorochloroethylene gas into the autoclave, reacting at 73-75° C. for 7 hours; cooling the autoclave to room temperature, reducing the pressure and discharging unreacted trifluorochloroethylene gas; precipitating the obtained liquid with ethanol and filtering it; and then performing Soxhlet extraction and drying to obtain the quaternary fluorocarbon resin.

[0008] In the preparation method of the quaternary fluorocarbon resin, the molar ratio of chlorotrifluoroethylene, 4-hydroxybutyl vinyl ether, itaconic acid and 1-octen-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 trifluorochloroethylene, 4-hydroxybutyl vinyl ether, itaconic acid and 1-octen-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-octen-3-ol acetate, azobisisobutyronitrile and the solvent.

[0011] In the preparation method of the tetrafluorocarbon 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] The method for preparing a mixture of modified sillimanite, nano-chromium diboride and basic magnesium sulfate whiskers comprises the following steps: mixing ethanol and deionized water to prepare a mixed solution, adding a KH-550 silane coupling agent, stirring at a speed of 600 r / min for 1.0 hour, then adding the mixture of sillimanite powder, nano-chromium diboride and basic magnesium sulfate whiskers, shearing at high speed for 50 minutes, reacting at 55°C for 3 hours, vacuum filtering, and finally drying under vacuum conditions to prepare the mixture of modified sillimanite, nano-chromium diboride and basic magnesium sulfate whiskers.

[0014] Wherein: 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 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 anti-corrosion coating of the present invention comprises the following steps:

[0019] (1) First, hydrogenated bisphenol A epoxy resin, dimethyl carbonate and methyl isobutyl ketone are mixed, and then quaternary fluorocarbon resin, terminal hydroxyl perfluoropolyether resin and polyperfluoromethyl isopropyl ether are added and blended, and then a mixture of modified sillimanite, nano chromium diboride and basic magnesium sulfate whiskers is added and dispersed at high speed for 23-25 ​​minutes, polyamide wax and di-n-butyltin dilaurate are added and mixed for 1.5 hours, and finally trifluoropropyl methyl silicone oil is added and stirred for 3-5 minutes to prepare component A;

[0020] (2) Component A and component B were mixed in a weight ratio of 10:1 to prepare a wear-resistant and anti-corrosion coating.

[0021] Wherein: in step (1), the stirring speed during the preparation of component A is 700 r / min.

[0022] In step (2), the stirring speed is 800 r / min, the stirring time is 25-27 min, and the stirring temperature is 25°C.

[0023] After spraying the wear-resistant and anti-corrosion coating in step (2), the coating was cured at room temperature for 36 hours.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] (1) The wear-resistant and anti-corrosion coating of the present invention is compounded with quaternary fluorocarbon resin, hydroxyl-terminated perfluoropolyether resin, hydrogenated bisphenol A epoxy resin and polyperfluoromethyl isopropyl ether as main components. The molecular chain of the quaternary fluorocarbon resin contains active groups such as hydroxyl and carboxyl groups. These groups can react with the isocyanate group -NCO of the HDI trimer to form a carbamate bond cross-linking network, thereby achieving coating curing. The fluorocarbon segment gives the coating high corrosion resistance and hydrophobicity. The rigid structure of the quaternary fluorocarbon resin makes the anti-corrosion coating have good mechanical properties. The terminal hydroxyl group of the hydroxyl-terminated perfluoropolyether resin can react with component B to form a three-dimensional cross-linking network, thereby improving the mechanical strength and adhesion of the coating. The low friction characteristics of the hydroxyl-terminated perfluoropolyether resin can reduce the surface wear of the anti-corrosion coating. In addition, the terminal hydroxyl group undergoes physical adsorption with the surface of the metal substrate, thereby enhancing the adhesion between the coating and the substrate, so that the anti-corrosion layer can be more firmly attached to the surface of the metal substrate and is not easy to fall off or crack, thereby ensuring the stability of the anti-corrosion effect. Hydrogenated bisphenol A epoxy resin exhibits excellent flexibility and impact resistance. It interacts with other components, such as quaternary fluorocarbon resins, to form a highly resilient network structure within the coating. This imparts not only excellent hardness and wear resistance to the modified fluorocarbon anticorrosion layer, but also provides a degree of resistance to external mechanical stress, preventing degradation of the coating's anticorrosion performance due to brittle cracking. Polyperfluoromethyl isopropyl ether provides fluorine and ether groups. The presence of these ether bonds imparts a lower surface energy to the modified fluorocarbon anticorrosion layer, helping to reduce the adhesion of contaminants such as dirt and oil to the coating surface, thereby enhancing the durability and effectiveness of the anticorrosion layer. Dispersed throughout the coating, it fills microporous defects in other resins and enhances the coating's density. The lubricity of the hydroxyl-terminated perfluoropolyether resin and the toughness of the hydrogenated bisphenol A epoxy resin jointly enhance wear resistance. The low surface tension of polyperfluoromethyl isopropyl ether promotes uniform dispersion of the other components and reduces coating porosity. The rigid structure of the quaternary fluorocarbon resin supports the coating's compressive strength, forming a "hard and flexible" wear-resistant system. The interaction of these four components gives the coating a dense structure. The high fluorine content fundamentally guarantees the coating's wear resistance and corrosion resistance. Dimethyl carbonate and methyl isobutyl ketone (MIBK) are used as solvents. Their combination avoids pinholes in the paint film caused by rapid evaporation of a single solvent and prevents sagging when MIBK is used alone, achieving a balance between spray leveling and cure speed. Trifluoropropyl methyl silicone oil is used as a defoamer, polyamide wax is used as a leveling agent, and a mixture of modified sillimanite, chromium diboride, and basic magnesium sulfate whiskers is used as a filler to enhance the coating's wear resistance. The synergistic effect of these raw materials ensures the corrosion and wear resistance of the resulting wear-resistant and anti-corrosion coating.

[0026] (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 skeleton in the coating, which can resist the embedding and plowing effect of abrasive particles during friction. The crystal structure of chromium diboride forms hard wear-resistant particles in the coating, which directly resist mechanical wear and abrasive cutting. The basic magnesium sulfate whiskers are needle-shaped single crystal fibers with a high aspect ratio, forming a three-dimensional network structure in the coating, which inhibits crack propagation through crack bridging, deflection and pull-out effects. Therefore, the three work synergistically to further improve the wear resistance of the coating.

[0027] (3) The wear-resistant and anti-corrosion coating described in the present invention uses 1-octen-3-ol acetate, 4-hydroxybutyl vinyl ether, itaconic acid, and trifluorochloroethylene as raw materials when preparing the quaternary fluorocarbon resin. Trifluorochloroethylene is used as a fluorine-containing monomer to form a rigid structure of the molecular main chain. The fluorine atoms are closely arranged in the outer layer of the carbon chain to form a "shielding effect" to block the corrosion of acids, alkalis and salt spray. The hydroxyl group is introduced as a cross-linking site through 4-hydroxybutyl vinyl ether, and reacts with the -NCO of the HDI trimer to form a dense three-dimensional network structure. The carboxyl group of itaconic acid can enhance the compatibility of the prepared quaternary fluorocarbon resin with the filler, and at the same time improve the adhesion of the coating through hydrogen bonding. 1-octen-3-ol acetate makes the prepared quaternary fluorocarbon resin have a certain flexibility. The improvement of flexibility can prevent the coating from cracking due to internal stress. The four raw materials interact with each other, with chlorotrifluoroethylene providing a rigid skeleton with a high fluorine content to resist chemical corrosion, 4-hydroxybutyl vinyl ether introducing cross-linking sites, itaconic acid enhancing the polarity of the prepared quaternary fluorocarbon resin, and 1-octen-3-ol acetate ensuring that the prepared quaternary fluorocarbon resin has a certain flexibility, thereby making the prepared quaternary fluorocarbon resin have excellent corrosion resistance.

[0028] (4) The wear-resistant and anti-corrosion coating of the present invention has a synergistic effect between the raw materials, ensuring that the prepared coating has excellent salt spray resistance, acid and alkali resistance, and a low wet friction coefficient and wear rate.

[0029] (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 be cured at room temperature, and the performance of the coating is stable after spraying. DETAILED DESCRIPTION

[0030] The present invention will be further described below with reference to the examples.

[0031] Example 1

[0032] The wear-resistant and anti-corrosion coating described in Example 1 is composed of component A and component B, and the weight ratio of component A to component B is 10:1. Component A is composed of the following raw materials in parts by weight: 31 parts of quaternary fluorocarbon resin, 11 parts of terminal hydroxyl perfluoropolyether resin, 14 parts of hydrogenated bisphenol A epoxy resin, 4 parts of polyperfluoromethyl isopropyl ether, 0.05 parts of di-n-butyltin 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 parts of trifluoropropyl methyl silicone oil and 0.9 parts of polyamide wax; component B is hexamethylene diisocyanate trimer.

[0033] The preparation method of the quaternary fluorocarbon resin comprises the following steps: first, evacuating the autoclave and passing argon gas to maintain an anhydrous and oxygen-free environment in the autoclave; then controlling the pressure of the autoclave to 1.5 MPa; first adding a solvent thereto, wherein the solvent is a mixture of 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether and xylene; then adding 1-octen-3-ol acetate, 4-hydroxybutyl vinyl ether, itaconic acid and azobisisobutyronitrile; then passing trifluorochloroethylene gas into the autoclave, reacting at 74° C. for 7 hours; cooling the autoclave to room temperature, reducing the pressure and discharging unreacted trifluorochloroethylene gas; precipitating the obtained liquid with ethanol and filtering it; and then performing Soxhlet extraction and drying to obtain the quaternary fluorocarbon resin.

[0034] In the preparation method of the quaternary fluorocarbon resin, the molar ratio of chlorotrifluoroethylene, 4-hydroxybutyl vinyl ether, itaconic acid and 1-octen-3-ol acetate is 50:30:10:10.

[0035] In the preparation method of the quaternary fluorocarbon resin, the mass of azobisisobutyronitrile accounts for 0.7% of the total mass of trifluorochloroethylene, 4-hydroxybutyl vinyl ether, itaconic acid and 1-octen-3-ol acetate.

[0036] 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-octen-3-ol acetate, azobisisobutyronitrile and the solvent.

[0037] In the preparation method of the tetrafluorocarbon resin, the volume ratio of 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether to xylene is 3:1.

[0038] 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.

[0039] The method for preparing a mixture of modified sillimanite, nano-chromium diboride and basic magnesium sulfate whiskers comprises the following steps: mixing ethanol and deionized water to prepare a mixed solution, adding a KH-550 silane coupling agent, stirring at a speed of 600 r / min for 1.0 hour, then adding the mixture of sillimanite powder, nano-chromium diboride and basic magnesium sulfate whiskers, shearing at high speed for 50 minutes, reacting at 55°C for 3 hours, vacuum filtering, and finally drying under vacuum conditions to prepare the mixture of modified sillimanite, nano-chromium diboride and basic magnesium sulfate whiskers.

[0040] Wherein: the volume ratio of KH-550 silane coupling agent, ethanol and deionized water is 5:18:2.

[0041] 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.

[0042] The mass ratio of sillimanite powder, nano-chromium diboride, and basic magnesium sulfate whiskers is 3:1.0:0.9.

[0043] 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.

[0044] The preparation method of the wear-resistant and anti-corrosion coating described in this embodiment 1 consists of the following steps:

[0045] (1) First, hydrogenated bisphenol A epoxy resin, dimethyl carbonate and methyl isobutyl ketone were mixed, and then quaternary fluorocarbon resin, hydroxyl-terminated perfluoropolyether resin and polyperfluoromethyl isopropyl ether were added and blended, and then a mixture of modified sillimanite, nano-chromium diboride and basic magnesium sulfate whiskers was added and dispersed at high speed for 24 minutes, polyamide wax and di-n-butyltin dilaurate were added and mixed for 1.5 hours, and finally trifluoropropyl methyl silicone oil was added and stirred for 4 minutes to prepare component A;

[0046] (2) Component A and component B were mixed in a weight ratio of 10:1 to prepare a wear-resistant and anti-corrosion coating.

[0047] Wherein: in step (1), the stirring speed during the preparation of component A is 700 r / min.

[0048] In step (2), the stirring speed is 800 r / min, the stirring time is 26 min, and the stirring temperature is 25°C.

[0049] After spraying the wear-resistant and anti-corrosion coating in step (2), the coating was cured at room temperature for 36 hours.

[0050] Example 2

[0051] The wear-resistant and anti-corrosion coating described in Example 2 is composed of component A and component B, and the weight ratio of component A to component B is 10:1. Component A is composed of the following raw materials in parts by weight: 32 parts of quaternary fluorocarbon resin, 10 parts of terminal hydroxyl perfluoropolyether resin, 13 parts of hydrogenated bisphenol A epoxy resin, 5 parts of polyperfluoromethyl isopropyl ether, 0.05 parts of di-n-butyltin 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 parts of trifluoropropyl methyl silicone oil and 1.0 parts of polyamide wax; component B is hexamethylene diisocyanate trimer.

[0052] The preparation method of the quaternary fluorocarbon resin comprises the following steps: first, evacuating the autoclave and passing argon gas to maintain an anhydrous and oxygen-free environment in the autoclave; then controlling the pressure of the autoclave to 1.5 MPa; first adding a solvent thereto, wherein the solvent is a mixture of 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether and xylene; then adding 1-octen-3-ol acetate, 4-hydroxybutyl vinyl ether, itaconic acid and azobisisobutyronitrile; then passing trifluorochloroethylene gas into the autoclave, reacting at 75° C. for 7 hours; cooling the autoclave to room temperature, reducing the pressure and discharging unreacted trifluorochloroethylene gas; precipitating the obtained liquid with ethanol and filtering it; and then performing Soxhlet extraction and drying to obtain the quaternary fluorocarbon resin.

[0053] In the preparation method of the quaternary fluorocarbon resin, the molar ratio of chlorotrifluoroethylene, 4-hydroxybutyl vinyl ether, itaconic acid and 1-octen-3-ol acetate is 50:30:10:10.

[0054] In the preparation method of the quaternary fluorocarbon resin, the mass of azobisisobutyronitrile accounts for 0.7% of the total mass of trifluorochloroethylene, 4-hydroxybutyl vinyl ether, itaconic acid and 1-octen-3-ol acetate.

[0055] 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-octen-3-ol acetate, azobisisobutyronitrile and the solvent.

[0056] In the preparation method of the tetrafluorocarbon resin, the volume ratio of 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether to xylene is 3:1.

[0057] 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.

[0058] The method for preparing a mixture of modified sillimanite, nano-chromium diboride and basic magnesium sulfate whiskers comprises the following steps: mixing ethanol and deionized water to prepare a mixed solution, adding a KH-550 silane coupling agent, stirring at a speed of 600 r / min for 1.0 hour, then adding the mixture of sillimanite powder, nano-chromium diboride and basic magnesium sulfate whiskers, shearing at high speed for 50 minutes, reacting at 55°C for 3 hours, vacuum filtering, and finally drying under vacuum conditions to prepare the mixture of modified sillimanite, nano-chromium diboride and basic magnesium sulfate whiskers.

[0059] Wherein: the volume ratio of KH-550 silane coupling agent, ethanol and deionized water is 5:18:2.

[0060] 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.

[0061] The mass ratio of sillimanite powder, nano-chromium diboride, and basic magnesium sulfate whiskers is 3:1.1:0.8.

[0062] 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.

[0063] The preparation method of the wear-resistant and anti-corrosion coating described in this embodiment 2 consists of the following steps:

[0064] (1) First, hydrogenated bisphenol A epoxy resin, dimethyl carbonate and methyl isobutyl ketone were mixed, and then quaternary fluorocarbon resin, terminal hydroxyl perfluoropolyether resin and polyperfluoromethyl isopropyl ether were added and blended, and then a mixture of modified sillimanite, nano chromium diboride and basic magnesium sulfate whiskers was added and dispersed at high speed for 25 minutes, polyamide wax and di-n-butyltin dilaurate were added and mixed for 1.5 hours, and finally trifluoropropyl methyl silicone oil was added and stirred for 5 minutes to prepare component A;

[0065] (2) Component A and component B were mixed in a weight ratio of 10:1 to prepare a wear-resistant and anti-corrosion coating.

[0066] Wherein: in step (1), the stirring speed during the preparation of component A is 700 r / min.

[0067] In step (2), the stirring speed is 800 r / min, the stirring time is 27 min, and the stirring temperature is 25°C.

[0068] After spraying the wear-resistant and anti-corrosion coating in step (2), the coating was cured at room temperature for 36 hours.

[0069] Example 3

[0070] The wear-resistant and anti-corrosion coating described in Example 3 is composed of component A and component B, and the weight ratio of component A to component B is 10:1. Component A is composed of the following raw materials in parts by weight: 30 parts of quaternary fluorocarbon resin, 12 parts of terminal hydroxyl perfluoropolyether resin, 15 parts of hydrogenated bisphenol A epoxy resin, 3 parts of polyperfluoromethyl isopropyl ether, 0.05 parts of di-n-butyltin 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 parts of trifluoropropyl methyl silicone oil and 0.8 parts of polyamide wax; component B is hexamethylene diisocyanate trimer.

[0071] The preparation method of the quaternary fluorocarbon resin comprises the following steps: first, evacuating the autoclave and passing argon gas to maintain an anhydrous and oxygen-free environment in the autoclave; then controlling the pressure of the autoclave to 1.5 MPa; first adding a solvent thereto, wherein the solvent is a mixture of 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether and xylene; then adding 1-octen-3-ol acetate, 4-hydroxybutyl vinyl ether, itaconic acid and azobisisobutyronitrile; then passing trifluorochloroethylene gas into the autoclave, reacting at 73° C. for 7 hours; cooling the autoclave to room temperature, reducing the pressure and discharging unreacted trifluorochloroethylene gas; precipitating the obtained liquid with ethanol and filtering it; and then performing Soxhlet extraction and drying to obtain the quaternary fluorocarbon resin.

[0072] In the preparation method of the quaternary fluorocarbon resin, the molar ratio of chlorotrifluoroethylene, 4-hydroxybutyl vinyl ether, itaconic acid and 1-octen-3-ol acetate is 50:30:10:10.

[0073] In the preparation method of the quaternary fluorocarbon resin, the mass of azobisisobutyronitrile accounts for 0.7% of the total mass of trifluorochloroethylene, 4-hydroxybutyl vinyl ether, itaconic acid and 1-octen-3-ol acetate.

[0074] 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-octen-3-ol acetate, azobisisobutyronitrile and the solvent.

[0075] In the preparation method of the tetrafluorocarbon resin, the volume ratio of 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether to xylene is 3:1.

[0076] 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.

[0077] The method for preparing a mixture of modified sillimanite, nano-chromium diboride and basic magnesium sulfate whiskers comprises the following steps: mixing ethanol and deionized water to prepare a mixed solution, adding a KH-550 silane coupling agent, stirring at a speed of 600 r / min for 1.0 hour, then adding the mixture of sillimanite powder, nano-chromium diboride and basic magnesium sulfate whiskers, shearing at high speed for 50 minutes, reacting at 55°C for 3 hours, vacuum filtering, and finally drying under vacuum conditions to prepare the mixture of modified sillimanite, nano-chromium diboride and basic magnesium sulfate whiskers.

[0078] Wherein: the volume ratio of KH-550 silane coupling agent, ethanol and deionized water is 5:18:2.

[0079] 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.

[0080] The mass ratio of sillimanite powder, nano-chromium diboride, and basic magnesium sulfate whiskers is 3:0.9:1.0.

[0081] 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.

[0082] The preparation method of the wear-resistant and anti-corrosion coating described in this embodiment 3 consists of the following steps:

[0083] (1) First, hydrogenated bisphenol A epoxy resin, dimethyl carbonate and methyl isobutyl ketone were mixed, and then quaternary fluorocarbon resin, terminal hydroxyl perfluoropolyether resin and polyperfluoromethyl isopropyl ether were added and blended. Subsequently, a mixture of modified sillimanite, nano-chromium diboride and basic magnesium sulfate whiskers was added and dispersed at high speed for 23 minutes. Polyamide wax and di-n-butyltin dilaurate were added and mixed for 1.5 hours. Finally, trifluoropropyl methyl silicone oil was added and stirred for 3 minutes to prepare component A.

[0084] (2) Component A and component B were mixed in a weight ratio of 10:1 to prepare a wear-resistant and anti-corrosion coating.

[0085] Wherein: in step (1), the stirring speed during the preparation of component A is 700 r / min.

[0086] In step (2), the stirring speed is 800 r / min, the stirring time is 25 min, and the stirring temperature is 25°C.

[0087] After spraying the wear-resistant and anti-corrosion coating in step (2), the coating was cured at room temperature for 36 hours.

[0088] Comparative Example 1

[0089] The preparation method of the wear-resistant and anti-corrosion coating described in this 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.

[0090] Comparative Example 2

[0091] The preparation method of the wear-resistant and anti-corrosion coating described in this 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 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.

[0092] Comparative Example 3

[0093] The preparation method of the wear-resistant and anti-corrosion coating described in this 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 with modified basic magnesium sulfate whiskers. The preparation method of 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.

[0094] Comparative Example 4

[0095] The preparation method of the wear-resistant and anti-corrosion coating described in this 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. Quaternary fluorocarbon resin is not added to the raw materials described in comparative example 4.

[0096] The wear-resistant and anti-corrosion coatings prepared in Examples 1-3 and Comparative Examples 1-4 were sprayed on the surface of a sucker rod for performance testing. The results are shown in Table 1 below. The salt spray resistance test standard is GB / T 1771-2007, the acid and alkali resistance test standard is GB / T 9274-1988, the corrosive 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, and the coating impact resistance test standard is GB / T 1732-2020. The friction and wear performance of the coating was evaluated by a linear reciprocating test using a CFT-I friction tester. The test adopts a ball-on-disc structure, a steel ball with a diameter of 4 mm, a load of 3 N, and wet friction at a constant speed of 400 r / min. Salt water is injected into the friction interface to simulate a wet environment. The test time is 30 min. Before the test, all friction pairs were cleaned several times with ethanol to remove surface impurities. Each test was repeated 4 times under the same conditions.

[0097] Table 1 Test results of wear-resistant and anti-corrosion coating performance of Examples 1-3 and Comparative Examples 1-4

[0098]

Claims

1. A wear-resistant and anti-corrosion coating, characterized by: The invention comprises component A and component B, wherein the weight ratio of component A to component B is 10:1, and component A comprises the following raw materials in parts by weight: 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 polyperfluoromethyl isopropyl ether, 0.05 parts of di-n-butyltin 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 parts of trifluoropropyl methyl silicone oil and 0.8-1.0 parts of polyamide wax; and component B is hexamethylene diisocyanate trimer. in: The preparation method of the quaternary fluorocarbon resin comprises the following steps: first, evacuating a high-pressure reactor and passing argon gas to maintain an anhydrous and oxygen-free environment in the high-pressure reactor; then controlling the pressure of the high-pressure reactor to 1.5 MPa; first, adding a solvent into the high-pressure reactor, wherein the solvent is a mixture of 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether and xylene; then, adding 1-octen-3-ol acetate, 4-hydroxybutyl vinyl ether, itaconic acid, and azobisisobutyronitrile; then, passing chlorotrifluoroethylene gas into the high-pressure reactor, reacting at 73-75° C. for 7 hours; cooling the reactor to room temperature, reducing the pressure, and discharging unreacted chlorotrifluoroethylene gas; precipitating the resulting liquid with ethanol, filtering, and performing Soxhlet extraction and drying to obtain the quaternary fluorocarbon resin; In the preparation method of the quaternary fluorocarbon resin, the molar ratio of trifluorochloroethylene, 4-hydroxybutyl vinyl ether, itaconic acid, and 1-octen-3-ol acetate is 50:30:10:10; 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.

2. The wear-resistant and anti-corrosion coating according to claim 1, characterized in that: In the preparation method of the quaternary fluorocarbon resin, the mass of azobisisobutyronitrile accounts for 0.7% of the total mass of trifluorochloroethylene, 4-hydroxybutyl vinyl ether, itaconic acid and 1-octen-3-ol acetate.

3. The wear-resistant and anti-corrosion coating according to claim 1, characterized in that: 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-octen-3-ol acetate, azobisisobutyronitrile and the solvent; In the preparation method of the tetrafluorocarbon resin, the volume ratio of 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether to xylene is 3:

1.

4. The wear-resistant and anti-corrosion coating according to claim 1, characterized in that: The method for preparing a mixture of modified sillimanite, nano-chromium diboride and basic magnesium sulfate whiskers comprises the following steps: mixing ethanol and deionized water to prepare a mixed solution, adding a KH-550 silane coupling agent, stirring at a speed of 600 r / min for 1.0 hour, then adding the mixture of sillimanite powder, nano-chromium diboride and basic magnesium sulfate whiskers, shearing at high speed for 50 minutes, reacting at 55°C for 3 hours, vacuum filtering, and finally drying under vacuum conditions to prepare the mixture of modified sillimanite, nano-chromium diboride and basic magnesium sulfate whiskers.

5. The wear-resistant and anti-corrosion coating according to claim 4, characterized in that: 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.

6. 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, hydrogenated bisphenol A epoxy resin, dimethyl carbonate and methyl isobutyl ketone are mixed, and then quaternary fluorocarbon resin, terminal hydroxyl perfluoropolyether resin and polyperfluoromethyl isopropyl ether are added and blended, and then a mixture of modified sillimanite, nano chromium diboride and basic magnesium sulfate whiskers is added and dispersed at high speed for 23-25 ​​minutes, polyamide wax and di-n-butyltin dilaurate are added and mixed for 1.5 hours, and finally trifluoropropyl methyl silicone oil is added and stirred for 3-5 minutes to prepare component A; (2) Component A and component B were mixed in a weight ratio of 10:1 to prepare a wear-resistant and anti-corrosion coating.

7. The method for preparing the wear-resistant and anti-corrosion coating according to claim 6, characterized in that: In step (1), the stirring speed is 700 r / min when preparing component A; In step (2), the stirring speed is 800 r / min, the stirring time is 25-27 min, and the stirring temperature is 25°C.

8. The method for preparing the wear-resistant and anti-corrosion coating according to claim 6, characterized in that: After spraying the wear-resistant and anti-corrosion coating in step (2), the coating was cured at room temperature for 36 hours.

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