Bio-based self-healing anti-corrosion and lubricating coatings and their preparation methods

Abstract

This disclosure provides a bio-based self-healing anti-corrosion and lubricating coating and a method for preparing the coating, relating to the field of anti-corrosion and lubricating coating technology. The bio-based self-healing anti-corrosion and lubricating coating comprises a first component and a second component, with a mass ratio of 2.4~2.6:1. The first component is prepared from raw materials including a mixed solvent, dispersant, micronized wax, modified molybdenum disulfide, zirconium phosphate, cerium oxide, and defoamer. The second component is a bio-based polyurethane prepolymer containing self-healing functional groups, and its raw materials include vanillin, 1,5-pentanediamine, castor oil, 1,5-pentanediisocyanate, isosorbide, bio-based diol, xylene, and dibutyltin dibutylsilicate. The bio-based self-healing anti-corrosion and lubricating coating of this disclosure exhibits excellent lubrication and anti-corrosion properties.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of anticorrosive lubricating coating, in particular to a bio-based self-healing anticorrosive lubricating coating and a preparation method thereof. BACKGROUND

[0002] With the rapid development of marine and offshore engineering, automobile and transportation, energy and power industry, etc., the demand for high-performance protective coating on the surface of metal substrate is increasing. Although the commonly used protective coating has good static anticorrosion performance, it has insufficient anticorrosion performance under dynamic conditions. Therefore, it is urgent to develop a coating with anticorrosion and lubrication functions, which can be applied to the surface of frequently moving or rotating parts and components, effectively preventing corrosion and avoiding the penetration of corrosive media and the failure of lubrication function due to microcracks caused by scratching, impact or fatigue of the coating during service, thereby shortening the service life of the components and increasing the maintenance cost.

[0003] In addition, in order to improve the durability and reliability of the coating, self-healing coating has become a research hotspot in recent years. Among them, some progress has been made based on the design of dynamic reversible chemical bonds including Diels-Alder bond, disulfide bond, ester exchange bond, etc. However, most of the existing self-healing systems rely on petroleum-based raw materials, which is difficult to meet the requirements of green chemical industry and sustainable development; at the same time, the repair conditions often require external heating, illumination or specific stimuli, and there are still limitations in the aspect of self-repairing at room temperature. On the other hand, although some research has tried to introduce self-repairing mechanism into anticorrosive coating, most of them focus on corrosion inhibition function, lack of synergistic design of lubrication properties, and it is difficult to achieve long-term protection under the condition of friction-corrosion coupling.

[0004] Bio-based raw materials provide a new idea for the development of environmentally friendly coatings. For example, renewable resources such as vegetable oil, cellulose derivatives and natural polyphenols have the advantages of wide sources, strong designability of molecular structure and good biocompatibility. However, bio-based coatings often face challenges such as insufficient mechanical strength, low repair efficiency and low functional integration. As a kind of dynamic covalent bond, imine bond can reversibly break and recombine under mild conditions, giving materials the ability to self-repair, and its formation does not require catalysts, avoiding the interference of side reactions on the performance of the coating. In recent years, some research has introduced imine bond into polymer network, but it is mostly used in flexible electronics or gel materials, and its application in anticorrosive and lubricating coating is less. In particular, how to combine the sustainability of bio-based raw materials, the dynamicity of imine bond and the protection and friction reduction properties of anticorrosive and lubricating components through molecular design has rarely been reported.

[0005] Therefore, it is necessary to provide a bio-based self-healing anticorrosive and lubricating coating based on imine bond, which has high-efficiency self-repairing, excellent anticorrosion and friction reduction performance, so as to improve the reliability of anticorrosive coating. SUMMARY

[0006] The purpose of the present disclosure is to provide a bio-based self-repairing anticorrosive lubricating coating and a preparation method of the bio-based self-repairing anticorrosive lubricating coating, thereby at least partially overcoming the problem of poor performance of the anticorrosive coating due to the limitations and defects of the related art.

[0007] According to one aspect of the present disclosure, a bio-based self-repairing anticorrosive lubricating coating is provided, which comprises a first component and a second component, and the mass ratio of the first component and the second component is 2.4-2.6:1; wherein the raw materials for preparing the first component include mixed solvents, dispersants, micronized wax, modified molybdenum disulfide, zirconium phosphate, cerium oxide, and defoaming agents; and the second component is a bio-based polyurethane prepolymer containing a self-repairing functional group, and the raw materials for preparing the second component include vanillin, 1,5-pentanediamine, castor oil, 1,5-pentane diisocyanate, isosorbide, bio-based diol, dimethylbenzene, and dibutyltin dimethoxide.

[0008] In an exemplary embodiment of the present disclosure, the raw materials for preparing the first component include, in terms of mass parts, 62-68% of mixed solvents, 1-5% of dispersants, 14-18% of micronized wax, 8-12% of modified molybdenum disulfide, 2-8% of zirconium phosphate, 0.3-0.7% of cerium oxide, and 0.3-0.7% of defoaming agents; wherein the mixed solvents are a mixture of acetone, dimethylbenzene, and cyclohexanone, and the mass ratio of the acetone, dimethylbenzene, and cyclohexanone is 2:2:1; and the dispersants are one or two of polyglycol polyester modified polyolefin imine, high molecular weight copolymer alkyl ammonium salt, and hydroxyl functional carboxylic acid ester.

[0009] In an exemplary embodiment of the present disclosure, the micronized wax is a high-density polyethylene / nano-alumina oxide composite, the particle size of the high-density polyethylene / nano-alumina oxide composite is 3.5-5.5 um, the melting point is 110-160°C, and the density is 0.99 g / cc; the particle size of the high-density polyethylene wax is 4.0-6.0 um, the melting point is 110-160°C, and the density is 0.96 g / cc.

[0010] In an example embodiment of the present disclosure, the preparation process of the modified molybdenum disulfide includes: ultrasonic dispersion of molybdenum disulfide powder with 30% HNO3 solution, centrifugal washing to neutral, and drying at 80℃; dispersion of the dried molybdenum disulfide in a mixed solvent composed of ethanol and water, and ultrasonic treatment to obtain pretreated molybdenum disulfide; the volume ratio of ethanol to water in the mixed solvent is 1:1; taking 1%-3% silane coupling agent by mass fraction, and adjusting the pH value to 4-5 with acetic acid to obtain a silanol hydrolysate; adding the pretreated molybdenum disulfide for ultrasonic dispersion, stirring and reacting at 50℃ to make the silanol hydrolysate condense with the surface hydroxyl groups of the molybdenum disulfide; washing with ethanol to remove unreacted substances, and vacuum drying at 60℃ for 12h to obtain the modified molybdenum disulfide.

[0011] In an example embodiment of the present disclosure, the purity of the modified molybdenum disulfide is ≥99%, the particle size of the modified molybdenum disulfide is 1.5-4um; the zirconium phosphate is α-zirconium phosphate, the purity of the zirconium phosphate is ≥99%, and the particle size of the zirconium phosphate is 0.5-1.5um; the purity of the cerium oxide is ≥99%, and the particle size of the cerium oxide is 1-3um.

[0012] In an example embodiment of the present disclosure, the defoaming agent is an organic silicon-based defoaming agent.

[0013] In an example embodiment of the present disclosure, the preparation process of the second component includes: complete dissolution of vanillin in dichloromethane, slow addition of 1,5-pentanediamine into the reaction system under the condition of 40℃-45℃ condensation reflux, increasing the temperature to 60℃ for reaction, filtration and purification to obtain a powder, and drying in a vacuum oven at 70℃ to obtain a bio-based diol containing a self-repairing functional group; addition of castor oil and dimethylbenzene into a four-necked flask, dehydration under the first condition, cooling to 80℃, addition of 1,5-pentane diisocyanate, reaction at 80℃ to prepare an isocyanate-terminated polyurethane prepolymer; dissolution of isosorbide, the bio-based diol containing a self-repairing functional group, and a catalyst in dimethylbenzene, slow addition into the reaction system containing the isocyanate-terminated polyurethane prepolymer for reaction, cooling to 60℃ for discharge to obtain a polyurethane prepolymer containing a self-repairing functional group.

[0014] In an example embodiment of the present disclosure, the molar ratio of vanillin to 1,5-pentanediamine is 2:1.

[0015] In an exemplary embodiment of the present disclosure, the raw materials for preparing the polyurethane prepolymer containing self-repairing functional groups include, in mass parts, castor oil 48.49%-49.15%, 1,5-pentanedioic isocyanate 27.45%-28.42%, isosorbide 2.56%-2.60%, bio-based diol 6.49%-6.58%, dimethylbenzene 14.03%-14.13%, dibutyltin dimethylsilicate 0.076-0.096%; wherein the index R value of the 1,5-pentanedioic isocyanate is 1.67-1.73, and the -NCO content is 6%-6.5%.

[0016] According to one aspect of the present disclosure, a method for preparing a bio-based self-repairing anticorrosive lubricating coating is provided, for preparing the bio-based self-repairing anticorrosive lubricating coating, the method comprising: sequentially adding a mixed solvent, a dispersant, micronized wax, modified molybdenum disulfide, zirconium phosphate, cerium oxide, and a defoaming agent into a ball mill tank, and stirring magnetically at room temperature to obtain a mixture; adding zirconium oxide grinding beads into the ball mill tank containing the mixture, and performing ball milling and filtration on a drum ball mill to obtain a first component; completely dissolving vanillin in dichloromethane, slowly adding 1,5-pentanediamine into the reaction system for reaction, filtering and purifying to obtain a powder, and drying to obtain a bio-based diol containing a self-repairing functional group; adding castor oil and dimethylbenzene into a four-necked flask, performing dehydration under the first condition, cooling to 80°C, and adding 1,5-pentanedioic isocyanate for reaction to prepare an isocyanate-terminated polyurethane prepolymer; dissolving isosorbide, the bio-based diol containing a self-repairing functional group, and a catalyst in dimethylbenzene, slowly adding the reaction system containing the isocyanate-terminated polyurethane prepolymer for reaction, cooling to 60°C to discharge, and obtaining a second component; mixing the second component with the first component in a mass ratio to obtain the bio-based self-repairing anticorrosive lubricating coating.

[0017] In the technical solutions provided in the embodiments of the present disclosure, on the one hand, the silane coupling agent KH792 is selected to modify the molybdenum disulfide, which can improve the dispersibility and compatibility of the molybdenum disulfide in the polyurethane resin, and because the KH792 molecule contains two amino groups, it can react with the isocyanate groups in the polyurethane prepolymer, thereby improving the curing speed and mechanical properties of the coating. The micronized wax is selected from high-density polyethylene / nano-aluminum oxide composite, high-density polyethylene wax micronized wax as an anti-corrosion and wear-resistant reinforcing material, which does not contain perfluoro and polyfluoro alkyl substances; the zirconium phosphate has significant friction reduction and wear resistance. On the other hand, the bio-based isosorbide is selected to provide a rigid structure, and due to the structural rigidity, it can impart high glass transition temperature and excellent mechanical properties to the polymer. The bio-based castor oil is selected to provide flexible long-chain fatty acid esters and hydroxyl groups, and the secondary hydroxyl groups in the molecular structure enable it to react directly with diisocyanate without modification. The bio-based isocyanate 1,5-pentanedioic diisocyanate is selected to enhance the durability and wear resistance, and the isocyanate content of 1,5-pentanedioic diisocyanate is higher. The above bio-based raw materials are used to construct a polyurethane main chain. The hydroxyl and aldehyde groups on the para position of the benzene ring of vanillin have strong design derivatization. The 1,5-pentanediamine molecule contains one amino group at each end, and has both reactivity and structural flexibility. A bio-based self-repairing polyurethane prepolymer is prepared by condensation reaction of 1,5-pentanediamine and vanillin to generate a compound containing an imine bond, and introducing a self-repairing functional group containing an imine bond. The imine bond in the bio-based polyurethane prepolymer containing the self-repairing functional group serves as a self-repairing functional group, which can realize self-repairing under mild conditions and improve the repairability. The bio-based self-repairing anti-corrosion and lubricating coating prepared based on the second component obtained from the bio-based polyurethane prepolymer containing the self-repairing functional group and the first component has improved repairability, good lubricating performance and anti-corrosion performance.

[0018] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0019] The drawings herein are incorporated into the specification and form a part of the specification, show embodiments consistent with the present disclosure, and together with the specification, serve to explain the principles of the present disclosure. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0020] Figure 1 The flow chart schematically shows a preparation method of modified molybdenum disulfide in the embodiments of the present disclosure.

[0021] Figure 2 The flow chart schematically shows a preparation method of the second component in the embodiments of the present disclosure.

[0022] Figure 3 A process for synthesizing a polyurethane prepolymer containing self-repairing functional groups is schematically shown.

[0023] Figure 4 A flow chart schematically showing a method for preparing a bio-based self-repairing anticorrosive lubricating coating.

[0024] Figure 5 A micrograph of a coating before repair is schematically shown.

[0025] Figure 6 A micrograph of a coating after repair is schematically shown. DETAILED DESCRIPTION

[0026] Example implementations will now be described more fully with reference to the accompanying drawings. Example implementations can be implemented in any

[0027] The language "one," "an," "the" and "said" is used herein to denote at least one of the items to which "one," "an," "the" or "said" refer to; the language "including" and "comprising" is used herein to be broad and inclusive, and to mean that ended up having, amongst other things, the listed items; and the language "first" and "second" are used herein only to distinguish one item from another, and not otherwise limit the items.

[0028] To solve the above problems, a bio-based self-repairing anticorrosive lubricating coating is provided in the embodiments of the present disclosure, which is suitable for the fields requiring long-acting corrosion protection and friction reduction and wear resistance, such as marine and offshore engineering, automobile and transportation, energy and power industry, etc.

[0029] The bio-based self-repairing anticorrosive lubricating coating can include a first component and a second component, and the mass ratio of the first component and the second component is 2.4-2.6:1; wherein the preparation raw materials of the first component include mixed solvents, dispersants, micronized waxes, modified molybdenum disulfide, zirconium phosphate, cerium oxide and defoaming agents; the second component is a bio-based polyurethane prepolymer containing a self-repairing functional group, and the preparation raw materials of the second component include vanillin, 1,5-pentanediamine, castor oil, 1,5-pentane diisocyanate, isosorbide, bio-based diol, dimethylbenzene and dibutyltin dimethoxide.

[0030] Exemplarily, the preparation raw materials of the first component include, in mass parts, mixed solvents 62%-68%, dispersants 1%-5%, micronized waxes 14%-18%, modified molybdenum disulfide 8%-12%, zirconium phosphate 2%-8%, cerium oxide 0.3%-0.7% and defoaming agents 0.3%-0.7%; the second component is a bio-based polyurethane prepolymer containing a self-repairing functional group.

[0031] The mixed solvents in the first component are a mixture of acetone, dimethylbenzene and cyclohexanone, and the mass ratio of acetone, dimethylbenzene and cyclohexanone in the mixture is 2:2:1.

[0032] The dispersants in the first component are one or two of polyglycol polyester modified polyolefin imine, high molecular weight copolymer alkyl ammonium salt and hydroxyl functional carboxylic acid ester.

[0033] The micronized waxes in the first component are high-density polyethylene / nano-alumina oxide composite, and the particle size of the high-density polyethylene / nano-alumina oxide composite is 3.5-5.5 um, the melting point is 110-160°C, and the density is 0.99 g / cc; the particle size of the high-density polyethylene wax is 4.0-6.0 um, the melting point is 110-160°C, and the density is 0.96 g / cc.

[0034] The purity of the modified molybdenum disulfide in the first component is ≥99%, and the particle size of the modified molybdenum disulfide is 1.5-4 um. The preparation process of the modified molybdenum disulfide includes:

[0035] In step S110, the molybdenum disulfide powder is ultrasonically dispersed with a 30% HNO3 solution, washed by centrifugation until neutral, and dried at 80°C; wherein the ultrasonic dispersion is performed for 1 h.

[0036] In step S120, the dried molybdenum disulfide is dispersed in a mixed solvent composed of ethanol and water, and ultrasonically treated to obtain pretreated molybdenum disulfide, so that the particles are depolymerized and the active sites are exposed; the volume ratio of ethanol to water in the mixed solvent is 1:1, and the ultrasonic treatment is performed for 2 h.

[0037] Step S130, take the mass fraction of 1%~3% silane coupling agent KH792, with acetic acid to adjust the pH value to 4~5 to promote hydrolysis to obtain silanol hydrolysis solution; stirring at room temperature for 2h, to ensure sufficient hydrolysis.

[0038] Step S140, adding pretreated molybdenum disulfide for ultrasonic dispersion for 30min, stirring at 50℃ for 12h, so that the silanol hydrolysis solution and the surface hydroxyl group of molybdenum disulfide condense.

[0039] Step S150, washing with ethanol to remove unreacted substances, and vacuum drying at 60℃ for 12h to obtain modified molybdenum disulfide.

[0040] The zirconium phosphate in the first component is α-zirconium phosphate, with a purity of ≥99% and a particle size of 0.5~1.5um.

[0041] The cerium oxide in the first component has a purity of ≥99% and a particle size of 1~3um. The defoaming agent in the first component is a silicone-based defoaming agent.

[0042] The second component is a bio-based polyurethane prepolymer containing self-repairing functional groups. Referring to Figure 2 The preparation method of the bio-based polyurethane prepolymer containing self-repairing functional groups represented by the second component includes the following steps:

[0043] Step S210, completely dissolving vanillin in dichloromethane, slowly adding 1,5-pentanediamine into the reaction system under the condition of 40℃~45℃ condensation reflux, increasing the temperature to 60℃ for reaction, filtering and purifying to obtain powder, and drying in a vacuum oven at 70℃ to obtain bio-based diol containing self-repairing functional groups;

[0044] Step S220, adding castor oil and dimethylbenzene into a four-necked flask, dehydrating under the first condition, cooling to 80℃, adding 1,5-pentane diisocyanate, and reacting at 80℃ to prepare an isocyanate-terminated polyurethane prepolymer;

[0045] Step S230, dissolving isosorbide, bio-based diol containing self-repairing functional groups, and catalyst in dimethylbenzene, slowly adding the reaction system containing the isocyanate-terminated polyurethane prepolymer for reaction, cooling to 60℃ for discharge, to obtain polyurethane prepolymer containing self-repairing functional groups.

[0046] For example, completely dissolving vanillin in dichloromethane, slowly adding 1,5-pentanediamine into the reaction system under the condition of 40℃~45℃ condensation reflux, increasing the temperature to 60℃, reacting for 6h, filtering and purifying to collect light yellow powder, and drying in a vacuum oven at 70℃ for 48h to obtain a novel bio-based diol containing imine bond, which is bio-based diol containing self-repairing functional groups.

[0047] The castor oil and dimethylbenzene are added into a four-necked flask, dehydrated for 3h under the first condition, then cooled to 80℃, 1,5-pentane diisocyanate is added, and reacted for 2h at 80℃ to prepare an isocyanate-terminated polyurethane prepolymer. The first condition is a rotation speed of 500r / min, a temperature of 105℃-115℃, and a vacuum condition of-0.095 to-0.1 MPa.

[0048] The isosorbide, the bio-based diol containing a self-repairing functional group, and a catalyst are dissolved in dimethylbenzene, slowly added into a reaction system containing the isocyanate-terminated polyurethane prepolymer, and reacted for 20min, and finally cooled to 60℃ to discharge to obtain the polyurethane prepolymer containing the self-repairing functional group. The catalyst can be dibutyltin dilaurate. The synthesis process of the polyurethane prepolymer containing the self-repairing functional group can be as shown in Figure 3

[0049] In the process of preparing the second component, the molar ratio of vanillin and 1,5-pentanediamine is 2:1. In step S220, the isocyanate index R value is 1.67-1.73, and the content of isocyanate group-NCO is 6%-6.5%. The raw materials for preparing the second component include, in mass parts: castor oil 48.49%-49.15%, 1,5-pentane diisocyanate 27.45%-28.42%, isosorbide 2.56%-2.60%, bio-based diol 6.49%-6.58%, dimethylbenzene 14.03%-14.13%, and dibutyltin dilaurate 0.076-0.096%.

[0050] In the embodiments of the present disclosure, a preparation method of a bio-based self-repairing anticorrosive lubricating coating is also provided, which is mainly composed of the following steps as shown in Figure 4

[0051] In step S410, the mixed solvent, the dispersant, the micronized wax, the modified molybdenum disulfide, the zirconium phosphate, the cerium oxide, and the defoaming agent are sequentially added into a ball mill tank, and magnetically stirred at room temperature to obtain a mixture;

[0052] In step S420, zirconium oxide grinding beads are added into the ball mill tank containing the mixture, and ball milling and filtration are performed on a drum ball mill to obtain the first component;

[0053] ​​Step S430, dissolve the vanillin in dichloromethane completely, slowly add 1,5-pentanediamine into the reaction system to react, filter, purify to obtain powder, and dry to obtain the bio-based diol containing self-repairing functional groups; add castor oil and dimethylbenzene into a four-necked flask, dehydrate and cool under the first condition, add 1,5-pentanedioic isocyanate to react, and prepare the terminal isocyanate-based polyurethane prepolymer; dissolve isosorbide, the bio-based diol containing self-repairing functional groups, and a catalyst in dimethylbenzene, slowly add the reaction system containing the terminal isocyanate-based polyurethane prepolymer to react, cool to the target temperature, and discharge to obtain the second component;

[0054] Step S440, mix the second component into the first component according to the mass ratio to obtain the bio-based self-repairing anticorrosive lubricating coating.

[0055] In the embodiment of the present disclosure, the preparation raw materials of the first component added into the ball mill tank include, in mass parts: mixed solvent 62%~68%, dispersant 1%~5%, micronized wax 14%~18%, modified molybdenum disulfide 8%~12%, zirconium phosphate 2%~8%, cerium oxide 0.3%~0.7%, and defoaming agent 0.3%~0.7%. Next, add zirconium oxide grinding beads into the ball mill tank containing the mixed materials, perform ball milling and filtration on the drum ball mill to obtain the first component. The particle size of the zirconium oxide grinding beads is 3~5 mm. Perform milling on the drum ball mill at a speed of 200~300 RPM for 2~2.5 h, and filter to obtain the first component.

[0056] Dissolve the vanillin in dichloromethane completely, add 1,5-pentanediamine into the reaction system under the condition of 40℃~45℃ condensation reflux, increase the temperature to 60℃, react for 6 h, filter, purify, collect the light yellow powder, and dry in a vacuum oven at 70℃ for 48 h to obtain the bio-based diol containing self-repairing functional groups; add castor oil and dimethylbenzene into a four-necked flask, dehydrate for 3 h under the first condition represented by a rotation speed of 500 r / min, a temperature of 105℃~115℃, and a vacuum condition of -0.095 to -0.1 MPa, then cool to 80℃, react for 2 h, add 1,5-pentanedioic isocyanate to react, and prepare the terminal isocyanate-based polyurethane prepolymer; dissolve isosorbide, the bio-based diol containing self-repairing functional groups, and a catalyst in dimethylbenzene, slowly add the reaction system containing the terminal isocyanate-based polyurethane prepolymer to react, react for 20 min, finally cool to 60℃, and discharge to obtain the second component.

[0057] Mix the second component into the first component according to the mass ratio to obtain the bio-based self-repairing anticorrosive lubricating coating. The mass ratio of the first component and the second component is 2.4~2.6:1.

[0058] In the embodiments of the present disclosure, the silane coupling agent KH792 is selected to modify the molybdenum disulfide, which can improve the dispersibility and compatibility of the molybdenum disulfide in the polyurethane resin; in addition, since the KH792 molecule contains two amino groups, it can react with the isocyanate groups in the polyurethane prepolymer, thereby improving the curing speed and mechanical properties of the coating. High-density polyethylene / nano-aluminum oxide composite, high-density polyethylene wax, and micronized wax are selected as the corrosion-resistant and wear-resistant reinforcing materials, which do not contain perfluoro and polyfluoro alkyl substances, effectively replacing the harm of polytetrafluoroethylene to the human body and the pollution to the environment. Alpha zirconium phosphate is a new type of layered material with significant friction reduction and wear resistance. These corrosion-resistant and wear-resistant reinforcing materials not only exhibit the advantages of their respective materials, but also exhibit good synergistic effect.

[0059] In the embodiments of the present disclosure, the bio-based polyurethane prepolymer containing self-repairing functional groups is prepared by molecular design and controllable synthesis. Bio-based isosorbide is selected to provide rigid structure. Isosorbide is a bio-based bicyclic diol containing two cis-tetrahydrofuran rings and hydroxyl groups. Due to the structural rigidity, it can endow the polymer with high glass transition temperature and excellent mechanical properties. Bio-based castor oil is selected to provide flexible long-chain fatty acid esters and hydroxyl groups. Castor oil is an ideal plant oil-based natural polyol for the synthesis of bio-based polyurethane. The secondary hydroxyl groups in its molecular structure enable it to react directly with diisocyanate without modification. Bio-based isocyanate 1,5-pentamethylene diisocyanate is selected to enhance the durability and wear resistance. 1,5-pentamethylene diisocyanate is a new type of bio-based aliphatic isocyanate with higher isocyanate content, and its performance is similar to that of hexamethylene diisocyanate. The above bio-based raw materials are used to construct the polyurethane backbone. Vanillin is a high-yield monomer derived from lignin. The para-hydroxyl and aldehyde groups on the benzene ring have strong designability. 1,5-pentanediamine is a typical bio-based linear aliphatic diamine, each end of which contains an amino group, and it has both reactivity and structural flexibility. A bio-based self-repairing polyurethane prepolymer is prepared by condensation reaction of 1,5-pentanediamine and vanillin to generate an imine-containing compound, and by designing and introducing an imine-containing self-repairing functional group.

[0060] The imine bond in the embodiments of the present disclosure serves as a self-repairing functional group, which can realize self-repairing under mild conditions. Materials that can realize self-repairing at a lower temperature or even room temperature have a wider range of applications in practical applications.

[0061] Next, the bio-based self-repairing corrosion-resistant and lubricating coating of the present disclosure will be described in detail in conjunction with the embodiments.

[0062] Embodiment 1

[0063] The bio-based self-repairing corrosion-resistant and lubricating coating comprises a first component and a second component, and the mass ratio of the first component to the second component is 2.4:1.

[0064] The raw materials for preparing the first component include, in mass parts: acetone 24.8%, xylene 24.8%, cyclohexanone 12.4%, polyglycol polyester modified polyolefin imine dispersant 5%, high-density polyethylene / nano-aluminum oxide composite micronized wax 18%, KH792 modified molybdenum disulfide 12%, alpha zirconium phosphate 2%, cerium oxide 0.7%, and silicone antifoaming agent 0.3%.

[0065] The second component is a bio-based polyurethane prepolymer containing self-repairing functional groups. The preparation method of the second component includes the following steps:

[0066] Vanillin is completely dissolved in dichloromethane, 1,5-pentanediamine is slowly added to the reaction system under the condition of condensation reflux at 40-45°C, the temperature is raised to 60°C, and the reaction is carried out for 6 hours, then a light yellow powder is collected by filtration and purification, and dried in a vacuum oven at 70°C for 48 hours to obtain a novel bio-based diol containing imine bond, i.e. a bio-based diol containing self-repairing functional groups. The molar ratio of vanillin to 1,5-pentanediamine is 2:1.

[0067] Castor oil and xylene are added to a four-necked flask, dehydrated at a rotation speed of 500 r / min, a temperature of 105-115°C, and a vacuum condition of -0.095 to -0.1 MPa for 3 hours, then cooled to 80°C, 1,5-pentanediamine isocyanate is added, and the reaction is carried out at 80°C for 2 hours to obtain an isocyanate-terminated polyurethane prepolymer. The isocyanate index R value is 1.67, and the -NCO content is 6%. The raw materials for preparing the second component include, in mass parts: castor oil 49.15%, 1,5-pentanediamine isocyanate 27.45%, isosorbide 2.60%, bio-based diol 6.58%, xylene 14.13%, and dibutyltin dimethylsilanediylbis 0.086%.

[0068] Then, isosorbide, bio-based diol, and catalyst dibutyltin dilaurate are dissolved in xylene and slowly added to the reaction system, the reaction is carried out for 20 minutes, and finally the temperature is lowered to 60°C to discharge the product, i.e. the second component, i.e. a polyurethane prepolymer containing self-repairing functional groups.

[0069] The preparation method of the bio-based self-repairing corrosion-resistant lubricating coating includes the following steps:

[0070] The mixed solvent, dispersant, micronized wax, modified molybdenum disulfide, zirconium phosphate, cerium oxide, and antifoaming agent are sequentially added to a ball mill tank, and magnetically stirred at 1000 RPM for 2 hours at room temperature;

[0071] 3-5 mm zirconium oxide grinding beads are added to the ball mill tank containing the mixed materials, and ground on a drum ball mill at a speed of 200-300 RPM for 2-2.5 hours, and then filtered to obtain the first component;

[0072] The second component is added into the first component in a mass ratio, and mixed uniformly to obtain the bio-based self-repairing corrosion-resistant lubricating coating.

[0073] Further, the bio-based self-repairing corrosion-resistant lubricating coating is sprayed on the surface of a carbon steel sheet that has been polished with 400-mesh sandpaper, cleaned with ethanol, and dried, with a spraying thickness of 50±5 um. After drying to form a film at room temperature, performance testing is performed. The performance testing can include dynamic friction coefficient, Rockwell hardness, tensile strength, salt spray resistance, and scratch repair time.

[0074] Example 2

[0075] The bio-based self-repairing corrosion-resistant lubricating coating includes a first component and a second component, and the mass ratio of the first component to the second component is 2.5:1.

[0076] The raw materials for preparing the first component include, in mass parts: acetone 26%, dimethylbenzene 26%, cyclohexanone 13%, high-molecular-weight copolymer alkyl ammonium salt dispersant 3%, high-density polyethylene / alumina nano-composite micronized wax 16%, KH792 modified molybdenum disulfide 10%, alpha zirconium phosphate 5%, cerium oxide 0.5%, and silicone antifoaming agent 0.5%.

[0077] The remaining parts of this example are the same as those of Example 1, which will not be described herein.

[0078] Example 3

[0079] The bio-based self-repairing corrosion-resistant lubricating coating includes a first component and a second component, and the mass ratio of the first component to the second component is 2.6:1.

[0080] The raw materials for preparing the first component include, in mass parts: acetone 27.2%, dimethylbenzene 27.2%, cyclohexanone 13.6%, hydroxyl-functional carboxylic acid ester dispersant 1%, high-density polyethylene micronized wax 14%, KH792 modified molybdenum disulfide 8%, alpha zirconium phosphate 8%, cerium oxide 0.3%, and silicone antifoaming agent 0.7%.

[0081] The remaining parts of this example are the same as those of Example 1, which will not be described herein.

[0082] Comparative Example 1

[0083] Comparative Example 1 is based on Example 1, except that the second component is adjusted to be a common polyurethane prepolymer, and the remaining parts remain unchanged.

[0084] The bio-based self-repairing corrosion-resistant lubricating coating includes a first component and a second component, and the mass ratio of the first component to the second component is 2.4:1.

[0085] The raw materials for preparing the first component include, in mass parts: acetone 24.8%, xylene 24.8%, cyclohexanone 12.4%, polyglycol polyester modified polyolefin imine dispersant 5%, high-density polyethylene / nano-aluminum oxide composite micronized wax 18%, KH792 modified molybdenum disulfide 12%, alpha zirconium phosphate 2%, cerium oxide 0.7%, and silicone antifoaming agent 0.3%.

[0086] The preparation method of the second component represented by the common polyurethane prepolymer includes the following steps:

[0087] Castor oil and xylene are added into a four-necked flask, and then dehydrated at a rotation speed of 500 r / min, a temperature of 105-115 DEG C, and a vacuum condition of -0.095 to -0.1 MPa for 3 h, and then cooled to 80 DEG C, and then 1,5-pentanedioyl isocyanate is added and reacted at 80 DEG C for 2 h to prepare an isocyanate-terminated polyurethane prepolymer. Then, isosorbide and a catalyst dibutyltin dilaurate are dissolved in xylene and slowly added into the reaction system, and reacted for 20 min, and finally cooled to 60 DEG C to discharge the product, and thus the common polyurethane prepolymer is obtained. The reaction system herein contains the isocyanate-terminated polyurethane prepolymer. The isocyanate index R value is 1.67, and the -NCO content is 6%. The raw materials for preparing the common polyurethane prepolymer include, in mass parts: castor oil 51.14%, 1,5-pentanedioyl isocyanate 28.57%, isosorbide 5.48%, xylene 14.73%, and dibutyltin dilaurate 0.085%.

[0088] The common polyurethane prepolymer is added into the first component in a proper proportion and uniformly mixed to obtain a common anticorrosive lubricating coating, which does not have a self-repairing function.

[0089] Comparative Example 2

[0090] In Comparative Example 2, the second component is adjusted to be a common polyurethane prepolymer based on Example 2, and the other parts remain unchanged.

[0091] The bio-based self-repairing anticorrosive lubricating coating includes a first component and a second component, and the mass ratio of the first component to the second component is 2.5:1.

[0092] The raw materials for preparing the first component include, in mass parts: acetone 26%, xylene 26%, cyclohexanone 13%, high-molecular-weight copolymer alkyl ammonium salt dispersant 3%, high-density polyethylene / aluminum oxide nano-composite micronized wax 16%, KH792 modified molybdenum disulfide 10%, alpha zirconium phosphate 5%, cerium oxide 0.5%, and silicone antifoaming agent 0.5%.

[0093] The preparation method of the second component represented by the common polyurethane prepolymer includes the following steps:

[0094] Castor oil and dimethylbenzene were added into a four-necked flask, and then dehydrated at 500 r / min, 105℃~115℃, and -0.095 to -0.1 MPa vacuum for 3 h. Then, the temperature was lowered to 80℃, 1,5-pentanedioic isocyanate was added, and the reaction was carried out at 80℃ for 2 h to obtain an isocyanate-terminated polyurethane prepolymer. Then, isosorbide and a catalyst dibutyltin dilaurate were dissolved in dimethylbenzene and slowly added into the reaction system, and the reaction was carried out for 20 min. Finally, the temperature was lowered to 60℃ to discharge the product, and thus a common polyurethane prepolymer was obtained. The isocyanate index R value was 1.67, and the -NCO content was 6%. The preparation raw materials of the common polyurethane prepolymer included, by mass fraction, castor oil 51.14%, 1,5-pentanedioic isocyanate 28.57%, isosorbide 5.48%, dimethylbenzene 14.73%, and dibutyltin dilaurate 0.085%.

[0095] The common polyurethane prepolymer was added into the first component according to a mass ratio, and then uniformly mixed to obtain a common anticorrosive lubricating coating.

[0096] Comparative Example 3

[0097] Comparative Example 3 was based on Example 3, and only the second component was adjusted to be the same common polyurethane prepolymer as in Comparative Example 1, and the other parts remained unchanged.

[0098] The bio-based self-repairing anticorrosive lubricating coating included a first component and a second component, and the mass ratio of the first component to the second component was 2.6:1.

[0099] The preparation raw materials of the first component included, by mass fraction, acetone 27.2%, dimethylbenzene 27.2%, cyclohexanone 13.6%, a hydroxyl-functional carboxylic acid ester dispersant 1%, high-density polyethylene micronized wax 14%, KH792 modified molybdenum disulfide 8%, alpha zirconium phosphate 8%, cerium oxide 0.3%, and an organic silicon defoaming agent 0.7%.

[0100] The preparation method of the second component represented by the common polyurethane prepolymer included the following steps:

[0101] The castor oil and xylene were added into a four-necked flask, and then dehydrated at a rotation speed of 500 r / min, a temperature of 105-115℃, and a vacuum condition of -0.095 to -0.1 MPa for 3 h. Then, the temperature was lowered to 80℃, and 1,5-pentanedioyl isocyanate was added. The reaction was carried out at 80℃ for 2 h to obtain an isocyanate-terminated polyurethane prepolymer. Then, isosorbide and a catalyst dibutyltin dilaurate were dissolved in xylene and slowly added into the reaction system. The reaction was carried out for 20 min, and then the temperature was lowered to 60℃ to discharge the product, thereby obtaining a common polyurethane prepolymer. The isocyanate index R value was 1.67, and the -NCO content was 6%. The common polyurethane prepolymer was prepared from the following raw materials in parts by mass: castor oil 51.14%, 1,5-pentanedioyl isocyanate 28.57%, isosorbide 5.48%, xylene 14.73%, and dibutyltin dilaurate 0.085%.

[0102] The common polyurethane prepolymer was added into the first component in a certain proportion, and then uniformly mixed to obtain a common anticorrosive lubricating coating.

[0103] Next, the dynamic friction coefficient of the coating was tested by the horizontal method according to GB / T 10006-2023, the load was 10 N, and the speed was 200 mm / min. The hardness of the coating was tested by the Vickers hardness microindentation method according to GB / T 30790.4-2015. The adhesion of the coating was quantitatively tested by the pull-off method according to GB / T 5210-2021. The anticorrosive performance of the coating was tested by the neutral salt spray according to GB / T 10125-2021, a sodium chloride solution with a mass concentration of (5±1)% was used (pH value was adjusted to 6.5-7.2 at 25℃), the temperature of the test box was kept at (35±2)℃, and the salt spray deposition was (1.0-2.0) mL / (h 80 cm²). The time when abnormal phenomena such as rust, blistering, and peeling occurred during the test of the coating was observed. The repair time of the coating under a scratch at a temperature of (23±2)℃ and a relative humidity of (50±10)% was observed by a metallographic microscope with a magnification of 20 times.

[0104] The performance test results of Examples 1-3 and Comparative Examples 1-3 can be shown in Table 1.

[0105] Table 1

[0106]

[0107] As can be seen from Table 1, compared with the coating prepared from the common anticorrosive lubricating coating prepared in Comparative Examples 1-3, the coating prepared from the bio-based self-repairing anticorrosive lubricating coating prepared in the present disclosure has the following advantages: the dynamic friction coefficient is as low as 0.045 or less, and has good lubricating performance; in addition, the salt spray test can reach 4500 h or more, and has excellent corrosion resistance; and the anticorrosive lubricating performance is excellent.

[0108] A scratch was made on the surface of the coating prepared by the bio-based self-repairing anticorrosive and lubricating coating, and according to Table 1, the scratch on the coating prepared by the bio-based self-repairing anticorrosive and lubricating coating in the embodiment of the present disclosure can be repaired in 8-9h or 9-10h. The micrograph of the coating before repair can be as shown in Figure 5 The micrograph of the coating after repair can be as shown in Figure 6 It can be seen that the bio-based self-repairing anticorrosive and lubricating coating has good self-repairing ability. The ordinary anticorrosive and lubricating coatings prepared by Comparative Examples 1-3 cannot realize scratch repair.

[0109] In the embodiment of the present disclosure, the molybdenum disulfide is modified by silane coupling agent KH792 to obtain modified molybdenum disulfide, which can improve the dispersibility and compatibility of molybdenum disulfide in polyurethane resin; in addition, since KH792 molecule contains two amino groups, it can react with isocyanate groups in the polyurethane prepolymer, thereby improving the curing speed and mechanical properties of the coating. High-density polyethylene / nano-alumina composite, high-density polyethylene wax, and micronized wax are selected as anticorrosive and wear-resistant reinforcing materials, which do not contain perfluoro and polyfluoro alkyl substances, effectively replacing the harm of polytetrafluoroethylene to the human body and the pollution to the environment. Alpha zirconium phosphate has significant friction reduction and wear resistance.

[0110] In the embodiment of the present disclosure, the bio-based polyurethane prepolymer containing self-repairing functional groups is prepared by molecular design and controllable synthesis. Bio-based isosorbide is selected to provide rigid structure. Due to the structural rigidity, the polymer has high glass transition temperature and excellent mechanical properties. Bio-based castor oil is selected to provide flexible long-chain fatty acid esters and hydroxyl groups. The secondary hydroxyl groups in the molecular structure of castor oil enable it to react directly with diisocyanate without modification. Bio-based isocyanate 1,5-pentanedioic diisocyanate is selected to enhance durability and wear resistance. 1,5-pentanedioic diisocyanate has a higher isocyanate content. The above bio-based raw materials are used to construct the polyurethane backbone. The hydroxyl and aldehyde groups on the para position of the benzene ring of vanillin have strong design derivatization. 1,5-pentanediamine contains one amino group at each end of the molecule, which has both reactivity and structural flexibility. A bio-based self-repairing polyurethane prepolymer is prepared by condensation reaction of 1,5-pentanediamine and vanillin to generate a compound containing imine bond, and by designing and introducing self-repairing functional groups containing imine bond. The imine bond in the embodiment of the present disclosure serves as a self-repairing functional group, which can realize self-repairing under mild conditions. Materials that can realize self-repairing at low temperature or even room temperature have a wider range of applications in practical applications.

[0111] Further, the above-described diagrams are merely schematic illustrations of the processes included in the method according to the exemplary embodiments of the present disclosure, and are not intended for limiting purposes. It is readily understood that the processes shown in the above-described diagrams do not indicate or limit the time sequence of the processes. In addition, it is readily understood that the processes can be executed, for example, synchronously or asynchronously in a plurality of modules.

[0112] Other embodiments of the present disclosure will be readily apparent to those skilled in the art upon considering the description herein, the drawings, and the annexed claims. The present application is intended to cover any variations, uses, or adaptations of the present disclosure following, in general, the principles of the present disclosure and including such

[0113] It should be understood that the present disclosure is not limited to the precise structures herein described and illustrated in the drawings, and that various modifications and changes can be made without departing from its scope. The scope of the present disclosure is limited only by the claims that follow.

Claims

1. A bio-based self-healing anticorrosive lubricating coating, characterized in that, The bio-based self-repairing anticorrosive lubricating coating comprises a first component and a second component, the bio-based self-repairing anticorrosive lubricating coating is obtained by mixing the second component into the first component according to a mass ratio, and the mass ratio of the first component to the second component is 2.4-2.6:1; The preparation raw materials of the first component include mixed solvents, dispersants, micronized wax, modified molybdenum disulfide, zirconium phosphate, cerium oxide and defoaming agents; the preparation raw materials of the first component include, in parts by mass, 62%-68% of mixed solvents, 1%-5% of dispersants, 14%-18% of micronized wax, 8%-12% of modified molybdenum disulfide, 2%-8% of zirconium phosphate, 0.3%-0.7% of cerium oxide and 0.3%-0.7% of defoaming agents; the dispersants are one or two of polyglycol polyester modified polyolefin imine, high molecular weight copolymer alkyl ammonium salt and hydroxyl functional carboxylic acid ester; the modified molybdenum disulfide is obtained by modifying molybdenum disulfide with a silane coupling agent, the silane coupling agent contains two amino groups, and the particle size of the modified molybdenum disulfide is 1.5-4 um; The second component is a bio-based polyurethane prepolymer containing a self-repairing functional group, and the preparation raw materials of the second component include vanillin, 1,5-pentanediamine, castor oil, 1,5-pentane diisocyanate, isosorbide, bio-based diol, xylene and dibutyltin dilaurate; The preparation process of the first component includes the following steps: The mixed solvents, dispersants, micronized wax, modified molybdenum disulfide, zirconium phosphate, cerium oxide and defoaming agents are sequentially added into a ball mill tank, and magnetic stirring is performed at room temperature to obtain a mixture; zirconium oxide grinding beads are added into the ball mill tank containing the mixture, ball milling and filtration are performed on a drum ball mill to obtain the first component; The preparation process of the second component includes the following steps: 48.49%-49.15% of vanillin is completely dissolved in dichloromethane, 27.45%-28.42% of 1,5-pentanediamine is slowly added into the reaction system under the condition of condensation reflux at 40-45°C, the temperature is increased to 60°C for reaction, filtration and purification are performed to obtain a powder, and drying is performed in a vacuum oven at 70°C to obtain a bio-based diol containing a self-repairing functional group; the molar ratio of vanillin to 1,5-pentanediamine is 2:1; Castor oil and xylene are added into a four-necked flask, dehydration is performed under the first condition, the temperature is decreased to 80°C, 1,5-pentane diisocyanate is added, and reaction is performed at 80°C to prepare an isocyanate-terminated polyurethane prepolymer; the first condition is a rotation speed of 500 r / min, a temperature of 105-115°C and a vacuum condition of -0.095 to -0.1 MPa. Dissolve 2.56%~2.60% isosorbide, 6.49%~6.58% bio-based diol containing self-repairing functional groups and catalyst in 14.03%~14.13% dimethylbenzene, slowly add the reaction system containing terminal isocyanate-based polyurethane prepolymer to react, and discharge at 60℃ to obtain polyurethane prepolymer containing self-repairing functional groups; wherein the catalyst is 0.076~0.096% dibutyltin dilaurate, the index R value of 1,5-pentanedioyl isocyanate is 1.67~1.73, and the -NCO content is 6%~6.5%.

2. The bio-based self-healing antiseptic lubricating coating according to claim 1, characterized in that, In the formula, n is 1~3, and m is 1~3. The mixed solvent is a mixture of acetone, dimethylbenzene and cyclohexanone, and the mass ratio of acetone, dimethylbenzene and cyclohexanone is 2:2:

1.

3. The bio-based self-healing antiseptic lubricating coating according to claim 1, characterized in that, The micronized wax is a high-density polyethylene / nano-aluminum oxide composite, and the particle size of the high-density polyethylene / nano-aluminum oxide composite is 3.5~5.5um, the melting point is 110℃~160℃, and the density is 0.99g / cc; the particle size of the high-density polyethylene wax is 4.0~6.0um, the melting point is 110℃~160℃, and the density is 0.96g / cc.

4. The bio-based self-healing antiseptic lubricating coating according to claim 1, characterized in that, The preparation process of the modified molybdenum disulfide includes: The molybdenum disulfide powder is ultrasonically dispersed with a 30% HNO3 solution, washed by centrifugation until neutral, and dried at 80℃; The dried molybdenum disulfide is dispersed in a mixed solvent composed of ethanol and water, and ultrasonically treated to obtain pretreated molybdenum disulfide; the volume ratio of ethanol to water in the mixed solvent is 1:1; A silane coupling agent with a mass fraction of 1%~3% is taken, and acetic acid is used to adjust the pH value to 4~5 to obtain a silanol hydrolysate; The pretreated molybdenum disulfide is added and ultrasonically dispersed, and the silanol hydrolysate is condensed with the surface hydroxyl groups of the molybdenum disulfide by stirring at 50℃; The unreacted substances are removed by washing with ethanol, and vacuum drying at 60℃ for 12h to obtain the modified molybdenum disulfide.

5. The bio-based self-healing antiseptic lubricating coating according to claim 1, characterized in that, The purity of the modified molybdenum disulfide is ≥99%; the zirconium phosphate is α-zirconium phosphate, the purity of the zirconium phosphate is ≥99%, and the particle size of the zirconium phosphate is 0.5~1.5um; the purity of the cerium oxide is ≥99%, and the particle size of the cerium oxide is 1~3um.

6. The bio-based self-healing antiseptic lubricating coating of claim 1, wherein, The defoaming agent is an organic silicon-based defoaming agent.

7. A method for the preparation of a bio-based self-healing anticorrosive lubricating coating, characterized by, The method for preparing the bio-based self-repairing corrosion-resistant lubricating coating of any one of claims 1~6 includes: The mixed solvent, dispersant, micronized wax, modified molybdenum disulfide, zirconium phosphate, cerium oxide and defoaming agent are sequentially added to a ball mill tank, and magnetic stirring is performed at room temperature to obtain a mixture; The first component is obtained by adding zirconium oxide grinding beads to a ball mill tank containing the mixture and performing ball milling filtration on a drum ball mill; the preparation raw materials of the first component include, in mass parts: 62%-68% of mixed solvent, 1%-5% of dispersant, 14%-18% of micronized wax, 8%-12% of modified molybdenum disulfide, 2%-8% of zirconium phosphate, 0.3%-0.7% of cerium oxide and 0.3%-0.7% of defoaming agent; the dispersant is one or two of polyglycol polyester modified polyolefin imine, high molecular weight copolymer alkyl ammonium salt and hydroxyl functional carboxylic acid ester; the modified molybdenum disulfide is obtained by modifying molybdenum disulfide with a silane coupling agent containing two amino groups; the particle size of the modified molybdenum disulfide is 1.5-4 um; Vanillin is completely dissolved in dichloromethane at 48.49%-49.15%, 1,5-pentanediamine is slowly added to the reaction system under the condition of 40-45 °C condensation reflux, the temperature is increased to 60 °C for reaction, filtration, purification to obtain powder, and drying in a vacuum oven at 70 °C to obtain a bio-based diol containing a self-repairing functional group; the molar ratio of vanillin to 1,5-pentanediamine is 2:1; castor oil and xylene are added to a four-necked flask, dehydrated under the first condition, cooled to 80 °C, and 1,5-pentane diisocyanate is added to react at 80 °C to prepare an isocyanate-terminated polyurethane prepolymer; the first condition is a rotation speed of 500 r / min, a temperature of 105-115 °C, and a vacuum condition of -0.095 to -0.1 MPa; 2.56%-2.60% isosorbide, 6.49%-6.58% bio-based diol containing a self-repairing functional group, and a catalyst are dissolved in 14.03%-14.13% xylene, and slowly added to a reaction system containing an isocyanate-terminated polyurethane prepolymer to react, and cooled to 60 °C to discharge to obtain a second component; wherein the catalyst is 0.076-0.096% dibutyltin dilaurate, the index R value of 1,5-pentane diisocyanate is 1.67-1.73, and the -NCO content is 6%-6.5%; The second component is added to the first component in a mass ratio to mix uniformly to obtain a bio-based self-repairing corrosion-resistant lubricating coating; the mass ratio of the first component to the second component is 2.4-2.6:1.

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