Lubricating type rust preventive oil, method for producing the same, and use thereof

Abstract

The application provides a lubricating antirust oil and a preparation method and application thereof, and the lubricating antirust oil comprises the following components in parts by weight: base oil 55-80 parts by weight, antirust agent 5-10 parts by weight, antioxidant 2-5 parts by weight, film forming agent 1-3 parts by weight and lubricating additive 5-10 parts by weight; the lubricating additive is prepared by mixing phosphate amine salt, bis-alkenyl succinimide, hexagonal boron nitride and modified metal complex; the modified metal complex is obtained by reacting 2,5-dihydroxybenzoic acid with a metal salt and then modifying the obtained product by using a long-chain alkane modifier. The lubricating antirust oil provided by the application can realize multiple effects of antirust and lubrication simultaneously.

Description

Technical Field

[0001] This application relates to the field of metal rust prevention technology, and in particular to a lubricating rust-preventive oil, its preparation method, and its application. Background Technology

[0002] During use and storage, metal structural components are susceptible to corrosion due to the influence of environmental substances such as water vapor, oxygen, acids, alkalis, salts, and carbides. Under certain temperature, humidity, and time conditions, physical and chemical changes occur, necessitating rust prevention treatment. A common rust prevention method involves spraying or dipping a layer of rust-preventive oil onto the metal surface. This forms an oil film that isolates the metal surface from direct contact with external corrosive media, achieving rust prevention for the metal structural components.

[0003] However, with the rapid development of industry, the existing rust-preventive oils have relatively limited performance. For example, metal structural components not only need rust prevention treatment, but also inevitably rub against other structural components during use. Rust-preventive oils are unable to lubricate the surface of metal structural components, leading to damage due to friction and a shortened service life. Therefore, it is very important to prepare a rust-preventive oil that can achieve multiple functions of rust prevention and lubrication. Summary of the Invention

[0004] This application provides a lubricating rust-preventive oil, its preparation method, and its application to solve the problems mentioned in the background art.

[0005] In a first aspect, this application provides a lubricating rust inhibitor comprising the following components in parts by weight: 55-80 parts by weight of base oil, 5-10 parts by weight of rust inhibitor, 2-5 parts by weight of antioxidant, 1-3 parts by weight of film-forming agent and 5-10 parts by weight of lubricating additive; The lubricating additive is prepared by mixing phosphate ester amine salt, diene succinimide, hexagonal boron nitride and modified metal complex; The modified metal complex was obtained by reacting 2,5-dihydroxybenzoic acid with a metal salt and then modifying it with a long-chain alkane modifier.

[0006] Optionally, the weight ratio of phosphate ester amine salt, diene succinimide, hexagonal boron nitride and modified metal complex is 1:1-1.5:0.5-1:0.5-1.2.

[0007] Optionally, the base oil includes one or more of 150SN, 300SN, PAO 40, PAO 100, PAO 300, 15# white mineral oil, and 10# white mineral oil.

[0008] Optionally, the rust inhibitor includes at least one of polypropylene glycol ether, polyethylene glycol ether, and dodecenyl succinic acid.

[0009] Optionally, the antioxidant includes at least one of 2,6-di-tert-butyl-p-cresol, dinonyldiphenylamine, and triphenyl phosphite.

[0010] Secondly, this application provides a method for preparing a lubricating rust-preventive oil. This method, used to prepare the aforementioned lubricating rust-preventive oil, includes the following steps: (1) Take the base oil by weight, stir it at 60-75℃ for 10-15 min, add the rust inhibitor and antioxidant, maintain the temperature and stir for 10-15 min to obtain component A; (2) According to the weight parts, mix the phosphate ester amine salt, diene succinimide, hexagonal boron nitride and modified metal complex, and stir at 50-65℃ for 15-25min to obtain the lubricating additive. Then add the film-forming agent to the lubricating additive, and stir at the temperature for 5-10min to obtain component B. (3) Mix component A and component B and stir at 60-75℃ for 10-20 minutes to obtain lubricating rust-preventive oil.

[0011] Optionally, the preparation method of the modified metal complex includes the following steps: (1) Take 2,5-dihydroxybenzoic acid and add it to deionized water. After stirring and mixing, an aqueous solution of 2,5-dihydroxybenzoic acid is obtained. Add alkali dropwise to the aqueous solution of 2,5-dihydroxybenzoic acid until the pH value is 5-8.5 to obtain the ligand solution. (2) Add the metal salt to deionized water and stir until the metal salt dissolves in the deionized water to obtain a metal salt solution; (3) Under stirring, the metal salt solution is added to the ligand solution and reacted at 40-60℃ for 0.5-8h. After standing and cooling to room temperature, the metal complex is obtained by filtration. (4) Disperse the metal complex in deionized water to obtain a metal complex dispersion. Disperse the long-chain alkane modifier in deionized water to obtain a modifier dispersion. Mix the metal complex dispersion and the modifier dispersion and stir the mixture at 70-85℃ for 2-6 hours. Filter, wash and dry to obtain the modified metal complex.

[0012] Optionally, in the aqueous solution of 2,5-dihydroxybenzoic acid, the weight-to-volume ratio of 2,5-dihydroxybenzoic acid to deionized water is 1-3 g / 50 mL; in the metal salt solution, the weight-to-volume ratio of metal salt to deionized water is 1-5 g / 50 mL. The molar ratio of 2,5-dihydroxybenzoic acid to the metal salt is 1-3:1.

[0013] Optionally, in the metal complex dispersion, the weight-to-volume ratio of the metal complex to deionized water is 1-2 g / 50 mL; in the modifier dispersion, the weight-to-volume ratio of the long-chain alkane modifier to deionized water is 1-2 g / 50 mL; and the molar ratio of the metal complex to the long-chain alkane modifier is 1-2:1.

[0014] Thirdly, this application provides an application of the lubricating rust-preventive oil prepared by the above method in the field of metal rust prevention and lubrication.

[0015] The lubricating rust-preventive oil, its preparation method, and its application provided in this application realize the preparation of lubricating rust-preventive oil, and compared with the prior art, it has the following beneficial effects: (1) This application uses a special ratio of base oil, rust inhibitor, antioxidant, film-forming agent and lubricating additive. The base oil serves as the carrier and main body, and as the carrier of each component additive, ensuring that each component additive is evenly dispersed and plays an effective role. The rust inhibitor forms a dense protective film on the metal surface, effectively preventing corrosive media from contacting the metal surface. The antioxidant delays the oxidation and aging of the base oil and each component additive during use and storage. At the same time, the modified metal complex in the lubricating additive is obtained by reacting 2,5-dihydroxybenzoic acid with a metal salt and then modifying it with a long-chain alkane modifier, so that the lubricating rust inhibitor provided by this application can achieve multiple functions of rust prevention and lubrication at the same time.

[0016] (2) This application utilizes long-chain alkanes to hydrophobically modify hydrophilic metal complexes, improving the compatibility of the modified metal complexes in base oils. Simultaneously, during friction, the metal complexes undergo chemical reactions on the metal surface, decomposing and releasing active elements (such as S and P derived from ligand modification or the metal itself). These elements interact with the metal surface, forming a robust protective film with low shear strength. This film, combined with the rust-preventive oil's own film, not only provides rust prevention for the metal surface, preventing direct contact with external corrosive media, but also significantly reduces wear on the metal surface during friction, thereby reducing wear and scratches. Furthermore, the benzene rings and hydroxyl groups in the modified metal complex molecular structure provide a graphite-like layered sliding effect, while the metal portion provides load-bearing capacity. In synergy with phosphate ester amine salts, diene succinimide, and hexagonal boron nitride, they collectively enhance the friction-reducing and anti-wear properties of the rust-preventive oil.

[0017] (3) The lubricating rust-preventive oil provided in this application can be used for lubrication and rust prevention of machine tool guide rails, gears, bearings and other components, and can also be used for maintenance of engine, gearbox and other components, extending the service life of automobiles. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application are described clearly and completely below. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are also within the scope of protection of this application.

[0019] In a first aspect, this application provides a lubricating rust inhibitor comprising the following components in parts by weight: 55-80 parts by weight of base oil, 5-10 parts by weight of rust inhibitor, 2-5 parts by weight of antioxidant, 1-3 parts by weight of film-forming agent and 5-10 parts by weight of lubricating additive; The lubricating additive is prepared by mixing phosphate ester amine salt, diene succinimide, hexagonal boron nitride and modified metal complex; The modified metal complex was obtained by reacting 2,5-dihydroxybenzoic acid with a metal salt and then modifying it with a long-chain alkane modifier.

[0020] Specifically, in the lubricating rust-preventive oil provided in this application, the base oil serves as the main carrier and component, acting as a carrier for various additive components to ensure uniform dispersion and effective function. The base oil itself forms an oil film, providing basic isolation, lubrication, and cooling. Rust inhibitor molecules preferentially adsorb onto the metal surface, forming a dense monomolecular or multimolecular protective film that effectively prevents corrosive media such as moisture and oxygen from contacting the metal, providing long-term, reliable rust protection for metal structural components. Antioxidants delay the oxidative aging of the base oil and various additive components during use and storage. Film-forming agents enhance the adhesion and strength of the oil film on the metal surface, making it less prone to loss, rinsing, or wiping. Lubricating additives include a mixture of phosphate ester amine salts, diene succinimide, hexagonal boron nitride, and modified metal complexes. Phosphate ester amine salts are extreme pressure anti-wear agents that can generate a solid phosphate lubricating film on the metal surface, reducing wear. Diolefin succinimide, as a dispersant, can improve the dispersion of various components in the base oil of rust-preventive oil, preventing component aggregation, especially the agglomeration of hexagonal boron nitride and modified metal complexes in the base oil. This, in turn, improves the uniformity of the rust-preventive oil and enhances its rust-preventive and lubricating effects. Hexagonal boron nitride has a layered structure, allowing for easy sliding between layers and uniform dispersion in the oil film. Working synergistically with other components, it reduces friction and wear on metal surfaces during frictional events due to interlayer slippage.

[0021] Among them, the phosphate ester amine salt is selected from dialkyl dithiophosphate ester amine salt.

[0022] The modified metal complex was obtained by reacting 2,5-dihydroxybenzoic acid with a metal salt and then modifying it with a long-chain alkane modifier. When 2,5-dihydroxybenzoic acid reacts with metal salts, the carboxyl oxygen atom and the adjacent phenolic hydroxy oxygen atom coordinate with a metal ion to form a stable complex. Simultaneously, a single 2,5-dihydroxybenzoic acid molecule can connect to two or more metal ions, forming a multidimensional structure. After the reaction, the hydrophilic complex is hydrophobically modified using long-chain alkanes. The uncoordinated phenolic hydroxyl groups on the ligands are modified to graft long-chain alkyl groups, significantly improving the compatibility of the modified metal complex in base oils and allowing for better dispersion. During friction, the modified metal complex undergoes a chemical reaction on the metal surface, decomposing and releasing active elements (such as S and P from ligand modification or the metal itself). These elements interact with the metal surface, forming a robust protective film with low shear strength. This film, combined with the rust-preventive oil's own film, not only provides rust prevention to the metal surface, preventing direct contact with external corrosive media, but also significantly reduces wear on the metal surface during friction, thus minimizing wear and scratches. Furthermore, the benzene ring and hydroxyl groups in the modified metal complex molecular structure can provide a graphite-like layered sliding effect, while the metal part provides load-bearing capacity. In synergy with phosphate ester amine salt, diene succinimide, and hexagonal boron nitride, the friction-reducing and wear-resistant properties of the rust-preventive oil are improved.

[0023] This application employs a specific ratio of base oil, rust inhibitor, antioxidant, film-forming agent, and lubricating additive. The base oil serves as both a carrier and the main component, ensuring uniform dispersion and effective function of each additive component. The rust inhibitor effectively prevents corrosive media from contacting the metal surface by forming a dense protective film. The antioxidant slows down the oxidative aging of the base oil and additive components during use and storage. Simultaneously, the lubricating additive contains a modified metal complex obtained by reacting 2,5-dihydroxybenzoic acid with a metal salt and then modifying it with a long-chain alkane modifier. Hydrophobic modification of hydrophilic metal complexes using long-chain alkanes improves their compatibility with base oils. During friction, the metal complexes undergo chemical reactions on the metal surface, decomposing and releasing active elements (such as sulfur and phosphorus from ligand modification or the metal itself). These elements interact with the metal surface to form a robust protective film with low shear strength. This film combines with the existing film of the rust-preventive oil, not only preventing rust from directly contacting corrosive media but also significantly reducing wear and scratches during friction. Furthermore, the benzene rings and hydroxyl groups in the modified metal complex molecular structure provide a graphite-like layered sliding effect, while the metal portion provides load-bearing capacity. Synergistic effects with phosphate ester amine salts, diene succinimide, and hexagonal boron nitride further enhance the friction-reducing and anti-wear properties of the rust-preventive oil.

[0024] Optionally, the weight ratio of phosphate ester amine salt, diene succinimide, hexagonal boron nitride and modified metal complex is 1:1-1.5:0.5-1:0.5-1.2.

[0025] Optionally, the base oil includes one or more of 150SN, 300SN, PAO 40, PAO 100, PAO 300, 15# white mineral oil, and 10# white mineral oil.

[0026] Optionally, the rust inhibitor includes at least one of polypropylene glycol ether, polyethylene glycol ether, and dodecenyl succinic acid.

[0027] Optionally, the antioxidant includes at least one of 2,6-di-tert-butyl-p-cresol, dinonyldiphenylamine, and triphenyl phosphite.

[0028] Secondly, this application provides a method for preparing a lubricating rust-preventive oil. This method, used to prepare the aforementioned lubricating rust-preventive oil, includes the following steps: (1) Take the base oil by weight, stir it at 60-75℃ for 10-15 minutes, add the rust inhibitor and antioxidant, maintain the temperature and stir for 10-15 minutes to obtain component A; increasing the temperature is beneficial to improving the fluidity of the base oil, which in turn is beneficial to the dispersion stability of other components in the base oil, thereby improving the uniformity of the oil film, which is beneficial to the rust-preventive oil having both rust-preventive and lubricating properties during use.

[0029] (2) According to the weight parts, mix the phosphate ester amine salt, diene succinimide, hexagonal boron nitride and modified metal complex, and stir at 50-65℃ for 15-25min to obtain the lubricating additive. Then add the film-forming agent to the lubricating additive, and stir at the temperature for 5-10min to obtain component B. (3) Mix component A and component B and stir at 60-75℃ for 10-20 minutes to obtain lubricating rust-preventive oil.

[0030] Optionally, the preparation method of the modified metal complex includes the following steps: (1) Take 2,5-dihydroxybenzoic acid and add it to deionized water. After stirring and mixing, an aqueous solution of 2,5-dihydroxybenzoic acid is obtained. Add alkali dropwise to the aqueous solution of 2,5-dihydroxybenzoic acid until the pH value is 5-8.5 to obtain the ligand solution. (2) Add the metal salt to deionized water and stir until the metal salt dissolves in the deionized water to obtain a metal salt solution; (3) Under stirring, the metal salt solution is added to the ligand solution and reacted at 40-60℃ for 0.5-8h. After standing and cooling to room temperature, the metal complex is obtained by filtration. (4) Disperse the metal complex in deionized water to obtain a metal complex dispersion. Disperse the long-chain alkane modifier in deionized water to obtain a modifier dispersion. Mix the metal complex dispersion and the modifier dispersion and stir the mixture at 70-85℃ for 2-6 hours. Filter, wash and dry to obtain the modified metal complex.

[0031] Specifically, an alkali is added dropwise to an aqueous solution of 2,5-dihydroxybenzoic acid to adjust the pH value. This facilitates the effective coordination of the ligand (2,5-dihydroxybenzoic acid) with metal ions, resulting in the deprotonation of the phenolic hydroxyl group. Preferably, the pH value of the aqueous solution of 2,5-dihydroxybenzoic acid is adjusted to 6-8 by adding alkali, so that both the phenolic hydroxyl and carboxyl groups can be effectively deprotonated and coordinated with the metal ions to form a stable metal complex. The alkali used is selected from sodium hydroxide, ammonia, or triethylamine. The concentration and amount of alkali used are not detailed in this application; the alkali only needs to be sufficient to adjust the pH of the aqueous solution of 2,5-dihydroxybenzoic acid to the desired value.

[0032] Furthermore, the metal salt is selected from any one of chloride salts, nitrate salts, and sulfate salts. Even further, the metal salt is selected from any one of FeCl3, FeCl2, CuCl2, AlCl3, NiCl2, Cu(NO3)2, Zn(NO3)2, CuSO4, and FeSO4.

[0033] The generated metal complex particles have a surface rich in polar groups and are hydrophilic. By adding long-chain alkane modifiers, the hydrophilic ionic ends are adsorbed onto the surface of the complex particles through electrostatic interactions or hydrogen bonds, while the hydrophobic long-chain alkane tails extend outwards, thereby transforming the hydrophilic particles into hydrophobic particles. This is beneficial for improving the dispersion stability of the modified metal complex in the base oil, thereby improving the uniformity and stability of the rust-preventive oil film, enhancing the rust-preventive and lubricating properties of the oil film, and extending the service life of metal structural components.

[0034] Optionally, in the aqueous solution of 2,5-dihydroxybenzoic acid, the weight-to-volume ratio of 2,5-dihydroxybenzoic acid to deionized water is 1-3 g / 50 mL; in the metal salt solution, the weight-to-volume ratio of metal salt to deionized water is 1-5 g / 50 mL. The molar ratio of 2,5-dihydroxybenzoic acid to the metal salt is 1-3:1.

[0035] Optionally, in the metal complex dispersion, the weight-to-volume ratio of the metal complex to deionized water is 1-2 g / 50 mL; in the modifier dispersion, the weight-to-volume ratio of the long-chain alkane modifier to deionized water is 1-2 g / 50 mL; and the molar ratio of the metal complex to the long-chain alkane modifier is 1-2:1.

[0036] Furthermore, the long-chain alkane modifier includes any one of hexadecyltrimethylammonium bromide, bis(octadecyl)dimethylammonium bromide, and octadecyltrimethoxysilane.

[0037] Thirdly, this application provides an application of the lubricating rust-preventive oil prepared by the above method in the field of metal rust prevention and lubrication.

[0038] Specifically, the lubricating rust-preventive oil provided in this application can be used for rust prevention and lubrication of metal surfaces, such as bearings, compressors, vacuum pumps, gear drives, and high-pressure grinding rollers. It can also be used for lubrication and rust prevention of precision models and metal parts, as well as for rust prevention during the storage and transportation of automotive parts.

[0039] The following are embodiments and effect test examples of the present invention, further describing the technical solution and technical effects of the present invention. However, the scope of protection of the present invention is not limited to these embodiments. Any changes or equivalent substitutions that do not depart from the concept of the present invention are within the scope of protection of the present invention. Furthermore, for those embodiments where specific technical operation steps or conditions are not specified, they are performed according to the techniques or conditions described in general literature in the art or according to the product instructions. Reagents or instruments used, unless otherwise specified, are all commercially available conventional products. Example 1

[0040] A method for preparing a lubricating rust-preventive oil, the method comprising the following steps: (1) Preparation of modified metal complexes: (110) Take 2,5-dihydroxybenzoic acid and add it to deionized water (the weight-volume ratio of 2,5-dihydroxybenzoic acid to deionized water is 1 g / 50 mL). After stirring and mixing, an aqueous solution of 2,5-dihydroxybenzoic acid is obtained. Sodium hydroxide solution is added dropwise to the aqueous solution of 2,5-dihydroxybenzoic acid until the pH value is 5, and the ligand solution is obtained. (120) Add metal salt (FeCl3) to deionized water and stir until the metal salt dissolves in the deionized water to obtain a metal salt solution; the weight-volume ratio of metal salt to deionized water is 1 g / 50 mL. (130) Under stirring, the metal salt solution was added to the ligand solution and reacted at 40°C for 2 hours. After standing and cooling to room temperature, the metal complex was obtained by filtration. The molar ratio of 2,5-dihydroxybenzoic acid to the metal salt was 1:1. (140) The metal complex was dispersed in deionized water at a weight-to-volume ratio of 1 g / 50 mL to obtain a metal complex dispersion. Hexadecyltrimethylammonium bromide was also dispersed in deionized water at a weight-to-volume ratio of 1 g / 50 mL to obtain a modifier dispersion. The metal complex dispersion and the modifier dispersion were mixed and stirred at 70 °C for 4 h. The mixture was then filtered, washed, and dried to obtain the modified metal complex. The molar ratio of the metal complex to the long-chain alkane modifier was 1:1.

[0041] (2) Take the base oil (PAO 40) by weight, stir at 60°C for 10 min, add the rust inhibitor (dodecenyl succinic acid) and antioxidant (2,6-di-tert-butyl-p-cresol), maintain the temperature and stir for 10 min to obtain component A.

[0042] (3) According to the weight parts, the phosphate ester amine salt, diene succinimide, hexagonal boron nitride and modified metal complex are mixed in a weight ratio of 1:1:0.5:0.5 and stirred at 50°C for 20 min to obtain the lubricating additive. Then, the film-forming agent is added to the lubricating additive and stirred at the temperature for 10 min to obtain component B.

[0043] (4) Mix component A and component B and stir at 60°C for 15 minutes to obtain a lubricating rust-preventive oil. The oil contains 55 parts by weight of base oil, 5 parts by weight of rust inhibitor, 2 parts by weight of antioxidant, 1 part by weight of film-forming agent and 5 parts by weight of lubricating additive. Example 2

[0044] A method for preparing a lubricating rust-preventive oil, the method comprising the following steps: (1) Preparation of modified metal complexes: (110) Take 2,5-dihydroxybenzoic acid and add it to deionized water (the weight-volume ratio of 2,5-dihydroxybenzoic acid to deionized water is 2g / 50mL). After stirring and mixing, an aqueous solution of 2,5-dihydroxybenzoic acid is obtained. Sodium hydroxide solution is added dropwise to the aqueous solution of 2,5-dihydroxybenzoic acid until the pH value is 6, and the ligand solution is obtained. (120) Add metal salt (FeCl3) to deionized water and stir until the metal salt dissolves in the deionized water to obtain a metal salt solution; the weight-volume ratio of metal salt to deionized water is 3g / 50mL. (130) Under stirring, the metal salt solution was added to the ligand solution and reacted at 50°C for 6 hours. After standing and cooling to room temperature, the metal complex was obtained by filtration. The molar ratio of 2,5-dihydroxybenzoic acid to the metal salt was 2:1. (140) The metal complex was dispersed in deionized water at a weight-to-volume ratio of 2 g / 50 mL to obtain a metal complex dispersion. Hexadecyltrimethylammonium bromide was dispersed in deionized water at a weight-to-volume ratio of 2 g / 50 mL to obtain a modifier dispersion. The metal complex dispersion and the modifier dispersion were mixed and stirred at 75 °C for 2 h. The mixture was then filtered, washed, and dried to obtain the modified metal complex. The molar ratio of the metal complex to the long-chain alkane modifier was 1.5:1.

[0045] (2) Take the base oil (PAO 40) by weight, stir at 70°C for 10 min, add the rust inhibitor (dodecenyl succinic acid) and antioxidant (2,6-di-tert-butyl-p-cresol), maintain the temperature and stir for 15 min to obtain component A.

[0046] (3) According to the weight parts, the phosphate ester amine salt, diene succinimide, hexagonal boron nitride and modified metal complex are mixed in a weight ratio of 1:1.3:0.7:1 and stirred at 60°C for 15 min to obtain the lubricating additive. Then, the film-forming agent is added to the lubricating additive and stirred at the temperature for 10 min to obtain component B.

[0047] (4) Mix component A and component B and stir at 70°C for 10 minutes to obtain a lubricating rust-preventive oil. The oil contains 70 parts by weight of base oil, 7 parts by weight of rust inhibitor, 4 parts by weight of antioxidant, 2 parts by weight of film-forming agent and 7 parts by weight of lubricating additive. Example 3

[0048] A method for preparing a lubricating rust-preventive oil, the method comprising the following steps: (1) Preparation of modified metal complexes: (110) Take 2,5-dihydroxybenzoic acid and add it to deionized water (the weight-volume ratio of 2,5-dihydroxybenzoic acid to deionized water is 3g / 50mL). After stirring and mixing, an aqueous solution of 2,5-dihydroxybenzoic acid is obtained. Sodium hydroxide solution is added dropwise to the aqueous solution of 2,5-dihydroxybenzoic acid until the pH value is 7, and the ligand solution is obtained. (120) Add metal salt (FeCl3) to deionized water and stir until the metal salt dissolves in the deionized water to obtain a metal salt solution; the weight-volume ratio of metal salt to deionized water is 5g / 50mL. (130) Under stirring, the metal salt solution was added to the ligand solution and reacted at 60°C for h. After standing and cooling to room temperature, the metal complex was obtained by filtration. The molar ratio of 2,5-dihydroxybenzoic acid to metal salt was 3:1. (140) The metal complex was dispersed in deionized water at a weight-to-volume ratio of 2 g / 50 mL to obtain a metal complex dispersion. Hexadecyltrimethylammonium bromide was also dispersed in deionized water at a weight-to-volume ratio of 2 g / 50 mL to obtain a modifier dispersion. The metal complex dispersion and the modifier dispersion were mixed and stirred at 85 °C for 2 h. The mixture was then filtered, washed, and dried to obtain the modified metal complex. The molar ratio of the metal complex to the long-chain alkane modifier was 2:1.

[0049] (2) Take the base oil (PAO 40) by weight, stir at 60-75℃ for 10-15 min, add the rust inhibitor (dodecenyl succinic acid) and antioxidant (2,6-di-tert-butyl-p-cresol), maintain the temperature and stir for 10-15 min to obtain component A.

[0050] (3) According to the weight parts, the phosphate ester amine salt, diene succinimide, hexagonal boron nitride and modified metal complex are mixed in a weight ratio of 1:1.5:1:1.2 and stirred at 65°C for 15 min to obtain the lubricating additive. Then the film-forming agent is added to the lubricating additive and stirred at the temperature for 10 min to obtain component B.

[0051] (4) Mix component A and component B and stir at 75°C for 10 min to obtain a lubricating rust-preventive oil. The oil contains 80 parts by weight of base oil, 10 parts by weight of rust inhibitor, 5 parts by weight of antioxidant, 3 parts by weight of film-forming agent and 10 parts by weight of lubricating additive. Example 4

[0052] A method for preparing a lubricating rust-preventive oil, the method comprising the following steps: The difference from Example 2 is that: (1) Preparation of modified metal complexes: (110) Take 2,5-dihydroxybenzoic acid and add it to deionized water (the weight-volume ratio of 2,5-dihydroxybenzoic acid to deionized water is 2g / 50mL). After stirring and mixing, an aqueous solution of 2,5-dihydroxybenzoic acid is obtained. Sodium hydroxide solution is added dropwise to the aqueous solution of 2,5-dihydroxybenzoic acid until the pH value is 8.5, and the ligand solution is obtained.

[0053] Comparative Example 1 A method for preparing a lubricating rust-preventive oil, the method comprising the following steps: The difference from Example 2 is that: (4) 70 parts by weight of base oil, 7 parts by weight of rust inhibitor, 4 parts by weight of antioxidant, 2 parts by weight of film-forming agent and 4 parts by weight of lubricating additive.

[0054] Comparative Example 2 A method for preparing a lubricating rust-preventive oil, the method comprising the following steps: The difference from Example 2 is that: (4) 70 parts by weight of base oil, 7 parts by weight of rust inhibitor, 4 parts by weight of antioxidant, 2 parts by weight of film-forming agent and 11 parts by weight of lubricating additive.

[0055] Comparative Example 3 A method for preparing a lubricating rust-preventive oil, the method comprising the following steps: The difference from Example 2 is that: (130) The molar ratio of 2,5-dihydroxybenzoic acid to the metal salt is 0.8:1.

[0056] Comparative Example 4 A method for preparing a lubricating rust-preventive oil, the method comprising the following steps: The difference from Example 2 is that: (130) The molar ratio of 2,5-dihydroxybenzoic acid to the metal salt is 3.5:1.

[0057] Comparative Example 5 A method for preparing a lubricating rust-preventive oil, the method comprising the following steps: The difference from Example 2 is that: The lubricant additive does not contain modified metal complexes.

[0058] Comparative Example 6 A method for preparing a lubricating rust-preventive oil, the method comprising the following steps: The difference from Example 2 is that: Lubricating rust-preventive oils do not contain lubricating additives.

[0059] Experimental Example 1 Salt spray resistance test The rust-preventive performance of the rust-preventive oils provided in this application was characterized by testing the salt spray resistance of Examples 1-4 and Comparative Examples 1-6. Commonly used 45# steel standard test pieces were selected, rinsed three times with acetone, and allowed to air dry. Then, referring to SH / T0081-1991 "Salt Spray Test Method for Rust-Preventive Greases," the rust-preventive oils provided in Examples 1-4 and Comparative Examples 1-6 were applied to the surface of the steel blocks. The steel blocks coated with rust-preventive oil were placed in a salt spray test chamber and tested according to the above standard. The time required for rust to appear was recorded. Three parallel tests were set up for each example and comparative example, and the average value was taken as the salt spray test time. The results are shown in Table 1.

[0060] Test conditions: temperature 50℃, test solution: 5wt% NaCl aqueous solution.

[0061] Table 1

[0062] Experiment Example 2 The lubricating rust-preventive oils provided in Examples 1-4 and Comparative Examples 1-6 were subjected to damp heat tests. Standard 45# steel test pieces were used, and the damp heat test time was determined according to GB / T 2361-1992. The tests were conducted continuously until rust appeared, and the time required was recorded. Three parallel tests were performed for each example and comparative example, and the average value was taken as the damp heat test time. The results are shown in Table 2.

[0063] Table 2

[0064] Table 2 shows that the results of the damp heat test are basically consistent with the salt spray resistance performance. Table 1 shows that the lubricating rust-preventive oil provided in this application has excellent rust-preventive performance. The salt spray resistance time of Examples 1-4 is significantly increased compared with Comparative Examples 1-6, and the damp heat resistance performance is also improved. Comparing Examples 1-3 with Comparative Examples 1, 2, and 6, it is shown that the addition of lubricating additives can improve the salt spray resistance performance of the rust-preventive oil, while the change in the molar ratio of 2,5-dihydroxybenzoic acid to metal salt has little effect on the rust-preventive performance of the rust-preventive oil. Moreover, in Comparative Example 5, no modified metal complex was added to the lubricating additive, and the rust-preventive performance was significantly reduced compared with Examples 1-4, indicating that the addition of modified metal complex can have a positive impact on the rust-preventive performance of the rust-preventive oil. This is attributed to the ability of modified metal complexes to interact with metal surfaces, forming a robust protective film with low shear strength. This film, combined with the rust-preventive oil's own film, improves the stability and strength of the oil film, preventing the metal surface from directly contacting external corrosive media and further promoting the rust-preventive effect of the oil film on the metal surface.

[0065] Experimental Example 3 The lubrication performance of the lubricating rust-preventive oils provided in Examples 1-4 and Comparative Examples 1-6 was tested. Using an MS-10A four-ball friction and wear testing machine manufactured by Xiamen Tianji Automation Co., Ltd., the extreme pressure carrying capacity of the greases in the examples and comparative examples was tested according to industry standards SH / T0202-1992 (Determination of Extreme Pressure Performance of Lubricating Grease - Four-ball Method) and SH / T 0204-1992 (Determination of Anti-wear Performance of Lubricating Grease - Four-ball Method). The results are shown in Table 3.

[0066] Table 3

[0067] Experiment Example 4 The tribological properties of the lubricating rust-preventive oils provided in Examples 1-4 and Comparative Examples 1-6 were tested. An MS-10A four-ball tribological testing machine manufactured by Xiamen Tianji Automation Co., Ltd. was used, and the tribological tests were conducted according to the petrochemical industry standard SH / T 0202-1992, "Determination of Extreme Pressure Properties of Lubricating Grease (Four-ball Method)". The test time was 60 min, the rotation speed was 1200 r / min, the steel balls were 12.7 mm in diameter, GCr15 (SAE52100), and the hardness was 750-850 HV. Each test was performed in at least three parallel runs, and the average value was taken. The test results are shown in Table 4.

[0068] Table 4

[0069] Table 3 shows that the maximum non-seize load and sintering load of Examples 1-4 are significantly higher than those of Comparative Examples 1-6, indicating that the lubricating rust-preventive oils provided in these examples have excellent extreme pressure bearing capacity. Meanwhile, Table 4 shows that Examples 1-4 have superior friction-reducing and anti-wear properties compared to Comparative Examples 1-6. Comparative Examples 1 and 2, compared to Examples 1-4, demonstrate that the amount of lubricating additive added within the range described in the examples has a positive impact on the lubrication performance of the rust-preventive oil, while decreasing or increasing the amount of lubricant added does not further improve the lubrication performance of the rust-preventive oil. Furthermore, Comparative Examples 3-6 show that the addition of modified metal complexes can significantly improve the extrusion anti-wear properties and friction-reducing properties of the rust-preventive oil. This is attributed to the fact that during friction, the metal complex can undergo a chemical reaction on the metal surface, decomposing and releasing active elements (such as S and P from ligand modification or the metal itself). These elements interact with the metal surface to form a robust protective film with low shear strength. This film, combined with the rust-preventive oil's own film, not only prevents the metal surface from directly contacting external corrosive media but also significantly reduces wear on the metal surface during friction, thereby reducing wear and scratches. Furthermore, the benzene ring and hydroxyl groups in the modified metal complex molecular structure provide a graphite-like layered sliding effect, while the metal portion provides load-bearing capacity. Together with phosphate ester amine salt, diene succinimide, and hexagonal boron nitride, they enhance the friction-reducing and anti-wear properties of the rust-preventive oil.

[0070] Based on the comprehensive analysis of Tables 1-4, the lubricating rust inhibitor provided in this application can simultaneously achieve multiple functions of rust prevention and lubrication.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A lubricating rust-preventive oil, characterized in that, The lubricating rust-preventive oil comprises the following components in parts by weight: 55-80 parts by weight of base oil, 5-10 parts by weight of rust inhibitor, 2-5 parts by weight of antioxidant, 1-3 parts by weight of film-forming agent and 5-10 parts by weight of lubricating additive; The lubricating additive is prepared by mixing phosphate ester amine salt, diene succinimide, hexagonal boron nitride and modified metal complex; The modified metal complex was obtained by reacting 2,5-dihydroxybenzoic acid with a metal salt and then modifying it with a long-chain alkane modifier.

2. The lubricating rust-preventive oil according to claim 1, characterized in that, The weight ratio of the phosphate ester amine salt, the diene succinimide, the hexagonal boron nitride, and the modified metal complex is 1:1-1.5:0.5-1:0.5-1.

2.

3. The lubricating rust-preventive oil according to claim 1, characterized in that, The base oil includes one or more of 150SN, 150SN, 300SN, PAO 40, PAO 100, PAO 300, 15# white mineral oil, and 10# white mineral oil.

4. The lubricating rust-preventive oil according to claim 1, characterized in that, The rust inhibitor includes at least one of polypropylene glycol ether, polyethylene glycol ether, and dodecenyl succinic acid.

5. The lubricating rust-preventive oil according to claim 1, characterized in that, The antioxidant includes at least one of 2,6-di-tert-butyl-p-cresol, dinonyldiphenylamine, and triphenyl phosphite.

6. A method for preparing a lubricating rust-preventive oil, characterized in that, The method is used to prepare the lubricating rust-preventive oil according to any one of claims 1-5, and the preparation method includes the following steps: (1) Take the base oil by weight, stir it at 60-75℃ for 10-15 min, add the rust inhibitor and the antioxidant, maintain the temperature and stir for 10-15 min to obtain component A; (2) Mix the phosphate ester amine salt, the diene succinimide, the hexagonal boron nitride and the modified metal complex according to the weight parts, and stir at 50-65°C for 15-25 min to obtain the lubricating additive. Then add the film-forming agent to the lubricating additive, and stir at the temperature for 5-10 min to obtain component B. (3) Mix the components A and B and stir at 60-75°C for 10-20 minutes to obtain the lubricating rust-preventive oil.

7. The method for preparing the lubricating rust-preventive oil according to claim 6, characterized in that, The preparation method of the modified metal complex includes the following steps: (1) Take 2,5-dihydroxybenzoic acid and add it to deionized water. After stirring and mixing, an aqueous solution of 2,5-dihydroxybenzoic acid is obtained. Add alkali dropwise to the aqueous solution of 2,5-dihydroxybenzoic acid until the pH value is 5-8.5 to obtain the ligand solution. (2) Add the metal salt to deionized water and stir until the metal salt dissolves in the deionized water to obtain a metal salt solution; (3) Under stirring, the metal salt solution is added to the ligand solution, and the reaction is carried out at a temperature of 40-60℃ for 0.5-8h. After standing and cooling to room temperature, the metal complex is obtained by filtration. (4) Disperse the metal complex in deionized water to obtain a metal complex dispersion, disperse the long-chain alkane modifier in deionized water to obtain a modifier dispersion, mix the metal complex dispersion with the modifier dispersion, stir and react at a temperature of 70-85℃ for 2-6 hours, filter, wash and dry to obtain the modified metal complex.

8. The method for preparing the lubricating rust-preventive oil according to claim 7, characterized in that, In the aqueous solution of 2,5-dihydroxybenzoic acid, the weight-to-volume ratio of 2,5-dihydroxybenzoic acid to deionized water is 1-3 g / 50 mL; in the metal salt solution, the weight-to-volume ratio of metal salt to deionized water is 1-5 g / 50 mL. The molar ratio of 2,5-dihydroxybenzoic acid to the metal salt is 1-3:

1.

9. The method for preparing the lubricating rust-preventive oil according to claim 1, characterized in that, In the metal complex dispersion, the weight-to-volume ratio of the metal complex to deionized water is 1-2 g / 50 mL; in the modifier dispersion, the weight-to-volume ratio of the long-chain alkane modifier to deionized water is 1-2 g / 50 mL; and the molar ratio of the metal complex to the long-chain alkane modifier is 1-2:

1.

10. The application of a lubricating rust-preventive oil prepared by the method according to any one of claims 6-9 in the field of metal rust prevention and lubrication.

Images