Molybdenum-bismuth diatom synergistic lubricating composition as well as preparation method and application thereof

Abstract

The invention discloses a preparation method and application of a molybdenum-bismuth diatom synergistic lubricating composition, and belongs to the technical field of lubricating compositions, the molybdenum-bismuth diatom synergistic lubricating composition comprises the following components by weight: 85-95 parts of GTL base oil, 2-6 parts of IQMg ionic liquid organic molybdenum, 1-4 parts of a bismuth ion complex, 0.5-2 parts of a dispersion stabilizer, 0.5-1.5 parts of an antioxidant and 0.5-1.5 parts of an anti-wear reagent at extreme pressure. According to the invention, through precise compatibility and dispersion of IQMg ionic liquid organic molybdenum and bismuth ion complex, a nano-composite lubricating film formed by interweaving a MoS layered structure and a BiS filling structure can be synergistically generated in situ at the moment and in the process of contact of a friction pair, so that the friction coefficient and the abrasion loss are remarkably reduced; and the IQMg ionic liquid organic molybdenum and bismuth ion complex is uniformly dispersed in the GTL base oil, has good stability and is not easy to precipitate, so that the lubricating composition has good high-temperature oxidation resistance and extreme pressure antiwear property.

Description

Technical Field

[0001] The invention belongs to the field of lubricating composition technology, and in particular relates to a method for preparing and applying a molybdenum-bismuth biatomic synergistic lubricating composition. Background Technology

[0002] Lubrication technology is the cornerstone of ensuring the efficient, reliable, and long-life operation of modern mechanical equipment. As industrial equipment develops towards high speed, heavy load, and high temperature, the performance requirements for lubricating materials are also increasing. Especially in fields such as wind power generation, aerospace, and precision manufacturing, lubrication failure often means huge economic losses and safety risks. Therefore, the development of high-end lubricating additives with excellent friction reduction, wear resistance, extreme pressure properties, good stability, and environmental friendliness has become a research hotspot and urgent need in this field.

[0003] The lubricating additive systems widely used in industry mainly rely on the following types of substances: 1. Traditional lubricating additives such as molybdenum disulfide (MoS2) have good lubricating properties, but they are prone to oxidation and failure under high temperature and high load conditions, and have poor dispersion stability in some base oils; 2. Bismuth-based additives have attracted attention due to their low cost, environmental friendliness and non-toxicity, good high temperature stability, excellent antioxidant and anti-corrosion properties, and certain anti-wear properties, but the lubricating performance of a single bismuth compound is limited; 3. Other solid lubricants, such as graphite and polytetrafluoroethylene (PTFE), have good chemical stability and high temperature resistance, but their compatibility and dispersibility with oil are usually worse, and each of them has its own obvious limitations.

[0004] The existing technology lacks a composite lubricant additive system that can simultaneously achieve high-efficiency friction reduction, wear resistance, high-temperature stability, and good dispersibility, resulting in poor overall performance and difficulty in meeting the needs of different working conditions. Therefore, improvements are needed. Summary of the Invention

[0005] The purpose of this invention is to address the problem that existing technologies lack composite lubricant additive systems that can simultaneously achieve high-efficiency friction reduction, wear resistance, high-temperature stability, and good dispersibility, resulting in poor overall performance and difficulty in meeting the needs of different working conditions. Therefore, this invention proposes a method for preparing and applying a molybdenum-bismuth biatomic synergistic lubricant composition.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A molybdenum-bismuth biatomic synergistic lubricating composition comprises the following components in parts by weight: 85-95 parts of GTL base oil, 2-6 parts of IQMg ionic liquid organic molybdenum, 1-4 parts of bismuth ion complex, 0.5-2 parts of dispersant stabilizer, 0.5-1.5 parts of antioxidant, and 0.5-1.5 parts of extreme pressure anti-wear agent.

[0007] As a further description of the above technical solution: The IQMg ionic liquid organic molybdenum is an organic molybdenum compound containing an imidazole quaternary ammonium salt structure, and the bismuth ion complex is a complex formed by bismuth and an organic ligand.

[0008] As a further description of the above technical solution: The dispersant and stabilizer is one or a combination of two of polyisobutylene succinimide and alkylbenzene sulfonate, the antioxidant is an amine or phenolic antioxidant, and the extreme pressure anti-wear agent is one or a combination of two of phosphate ester and thiophosphate ester.

[0009] A method for preparing a molybdenum-bismuth diatomic synergistic lubricating composition specifically includes the following steps: S1. Base oil preheating and stabilizer dispersion: Pump the prescribed amount of GTL base oil into the main reactor, heat it to 60-80℃ and keep it at a constant temperature, and slowly add the prescribed amount of dispersion stabilizer. S2, IQMg ionic liquid organic molybdenum fine dispersion: The formula amount of IQMg ionic liquid organic molybdenum is slowly and evenly added through a metering pump. Then the material is transferred to a pipeline high shear dispersion emulsifier for primary dispersion. Subsequently, the material is pumped into an ultrasonic reactor for deep dispersion, and ultrasonic dispersion is carried out at 60-80℃ for 30-60 minutes. S3. Blending and reaction of bismuth ion complex: Transfer the material back to the main reactor and slowly add the bismuth ion complex powder of the formula amount through the powder feeder. After the feeding is completed, keep the temperature and mechanically stir and mix for 1-2 hours to make the bismuth ion complex fully dispersed and pre-react with other components in the system. S4. Final mixing of functional additives: While maintaining stirring and temperature, add the antioxidant and extreme pressure anti-wear agent in the formula amount in sequence, and continue stirring and mixing evenly to obtain a uniform mixture of all components; S5. Homogenization and Finished Product Processing: The above mixture is cooled to below 40°C and then pumped into a high-pressure homogenizer for homogenization. The final product is filtered through a bag filter to obtain a molybdenum-bismuth biatomic synergistic lubricating composition.

[0010] As a further description of the above technical solution: The main reactor in S1 is equipped with a jacketed heater and an anchor stirrer. After heating, the anchor stirrer inside is started. The speed of the anchor stirrer is 200-300 rpm, and it is continuously stirred for 30-45 minutes until the material inside is completely dissolved and evenly dispersed.

[0011] As a further description of the above technical solution: In step S2, the stirring speed of the main reactor is increased to 400-500 rpm, the shear rate of the inline high-shear dispersion emulsifier is 10000-15000 rpm, the circulation process is 15-20 minutes, and the ultrasonic power of the ultrasonic reactor is set to 800-1200W.

[0012] As a further description of the above technical solution: The mechanical stirring speed of the anchor-type agitator inside the main reactor in S3 is 300-400 rpm, and the feeding time of the powder feeder is controlled within 20-30 minutes.

[0013] As a further description of the above technical solution: Each additive in S4 is added at intervals of 5-10 minutes, and stirring continues for 30-45 minutes after the addition is complete.

[0014] As a further description of the above technical solution: The pressure of the high-pressure homogenizer in the S5 is 50-100MPa, and the cycle is 2-3 times.

[0015] As a further description of the above technical solution: The aforementioned molybdenum-bismuth biatomic synergistic lubricating composition is used in the preparation of gear oils, engine oils, hydraulic oils, or metalworking fluids.

[0016] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: In this invention, through the precise formulation and dispersion of IQMg ionic liquid organic molybdenum and bismuth ion complex, a nanocomposite lubricating film composed of an interwoven MoS2 layered structure and a Bi2S3 filled structure can be synergistically generated in situ during the contact of the friction pair. This significantly reduces the coefficient of friction and wear, not only significantly enhancing the density and load-bearing capacity of the lubricating film, but also avoiding the disadvantage of a single MoS2 film being easily punctured under high temperature and high load. Furthermore, when the composite film is locally damaged due to extreme pressure, the active components in the solution can rapidly migrate to the damaged site, achieving dynamic self-repair of the lubricating film, thereby providing continuous and stable protection. The IQMg ionic liquid organic molybdenum and bismuth ion complex are uniformly dispersed in GTL base oil, have good stability, and are not prone to precipitation, giving the lubricating composition good high-temperature oxidation resistance and extreme pressure anti-wear properties. It is suitable for mechanical lubrication under high temperature and high load conditions, extending the service life of equipment. Detailed Implementation

[0017] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention. Example

[0018] This invention provides a technical solution: a molybdenum-bismuth biatomic synergistic lubricating composition, comprising the following components by weight: 92.5 parts of GTL base oil, 2 parts of IQMg ionic liquid organic molybdenum, 1 part of bismuth ion complex, 1 part of dispersant stabilizer, 1.5 parts of antioxidant, and 2 parts of extreme pressure anti-wear agent; A method for preparing a molybdenum-bismuth diatomic synergistic lubricating composition specifically includes the following steps: S1. Base oil preheating and stabilizer dispersion: The prescribed amount of GTL base oil is transferred to the main reactor equipped with a jacketed heating system and an anchor stirrer via a transfer pump. The jacket heating is started to raise the oil temperature to and maintain it at 70°C. Then the anchor stirrer is started and its speed is controlled within the range of 200-300 rpm. Under this gentle stirring condition, the prescribed amount of dispersion stabilizer is added slowly and evenly. After the addition is completed, the mixture is kept warm and stirred for 30 minutes until the dispersion stabilizer is completely dissolved and forms a homogeneous and stable system in the base oil. S2. Fine dispersion of IQMg ionic liquid organic molybdenum: Maintaining the temperature (70℃) and inert atmosphere protection of step S1, the speed of the anchor stirrer in the main reactor is increased to 400-500 rpm to form a stronger vortex. The formulated amount of IQMg ionic liquid organic molybdenum is slowly and evenly injected into the reaction system through a precision metering pump. After the feeding is completed, the material is pumped from the main reactor to a pipeline high-shear dispersing emulsifier and circulated at a high shear rate of 12,000 rpm for 15 minutes to achieve primary emulsification and dispersion. Then, the material is introduced into an ultrasonic reactor for deep dispersion. The ultrasonic power is set to 1000W and the process is continued at 70℃ for 45 minutes. This two-step dispersion process ensures that IQMg ionic liquid organic molybdenum is stably and uniformly dispersed at the nanoscale in the oil phase. S3. Blending and reaction of bismuth ion complex: The deeply dispersed material is transferred back to the main reactor and the internal temperature is maintained at 70°C. The anchor stirrer speed is adjusted to 400 rpm. The bismuth ion complex powder (such as bismuth ammonium citrate) of the formula is slowly and evenly added over 20-30 minutes through the powder feeder to avoid powder agglomeration or sedimentation. After all the powder has been added, the temperature is maintained and mechanical stirring is kept at 400 rpm for 1.5 hours to ensure that the bismuth ion complex is fully dispersed and pre-complexed and activated with the uniformly distributed IQMg organic molybdenum in the oil phase, laying the foundation for synergistic film formation in the subsequent friction process. S4. Final mixing of functional additives: Under the above temperature and stirring conditions (70℃, 400rpm), add the antioxidant (such as amine antioxidant Irganox L57) and extreme pressure anti-wear agent (such as tricresyl phosphate) in the formula amount in sequence. Each additive is added at an interval of 5-10 minutes to ensure that it is initially dispersed before adding the next one. After all additives are added, continue stirring for 30 minutes to make all components fully mixed and uniform, so as to obtain the final crude lubricating composition. S5. Homogenization and Finished Product Processing: The crude lubricating composition obtained in S4 is cooled to below 40°C through a heat exchanger, and then pumped into a high-pressure homogenizer for homogenization at 80MPa. This process is repeated twice to further pulverize any possible micro-aggregates, ensuring the product's ultra-fine particle size and long-term storage stability. Finally, the homogenized product is filtered through a bag filter with a precision of 5-10μm to remove any trace mechanical impurities, resulting in a clear and transparent molybdenum-bismuth biatomic synergistic lubricating composition. Finally, it undergoes quality inspection and packaging.

[0019] Specific implementation method: By introducing a small amount of bismuth ion complex and a low content of IQMg ionic liquid organic molybdenum for precise compatibility, a significant molybdenum-bismuth synergistic effect was successfully triggered. That is, a unique MoS2 / Bi2S3 nanocomposite lubricating film was generated in situ on the surface of the friction pair. Unlike the simple lubricating film formed by a single component, this composite film exhibits a more dense, tough and self-healing microstructure, which greatly enhances the load-bearing capacity and structural stability of the lubricating film and effectively avoids the disadvantage of a single MoS2 film being easily punctured under high pressure. Example

[0020] This embodiment differs from Embodiment 1 in that it also provides a technical solution: a molybdenum-bismuth biatomic synergistic lubricating composition, which is composed of the following components by weight: 91.5 parts of GTL base oil, 3 parts of IQMg ionic liquid organic molybdenum, 2 parts of bismuth ion complex, 1 part of dispersant stabilizer, 1.5 parts of antioxidant, and 1 part of extreme pressure anti-wear agent. A method for preparing a molybdenum-bismuth diatomic synergistic lubricating composition specifically includes the following steps: S1. Base oil preheating and stabilizer dispersion: The prescribed amount of GTL base oil is transferred to the main reactor equipped with a jacketed heating system and an anchor stirrer via a transfer pump. The jacket heating is started to raise the oil temperature to and maintain it at 70°C. Then the anchor stirrer is started and its speed is controlled within the range of 200-300 rpm. Under this gentle stirring condition, the prescribed amount of dispersion stabilizer is added slowly and evenly. After the addition is completed, the mixture is kept warm and stirred for 30 minutes until the dispersion stabilizer is completely dissolved and forms a homogeneous and stable system in the base oil. S2. Fine dispersion of IQMg ionic liquid organic molybdenum: Maintaining the temperature (70℃) and inert atmosphere protection of step S1, the speed of the anchor stirrer in the main reactor is increased to 400-500 rpm to form a stronger vortex. The formulated amount of IQMg ionic liquid organic molybdenum is slowly and evenly injected into the reaction system through a precision metering pump. After the feeding is completed, the material is pumped from the main reactor to a pipeline high-shear dispersing emulsifier and circulated at a high shear rate of 12,000 rpm for 15 minutes to achieve primary emulsification and dispersion. Then, the material is introduced into an ultrasonic reactor for deep dispersion. The ultrasonic power is set to 1000W and the process is continued at 70℃ for 45 minutes. This two-step dispersion process ensures that IQMg ionic liquid organic molybdenum is stably and uniformly dispersed at the nanoscale in the oil phase. S3. Blending and reaction of bismuth ion complex: The deeply dispersed material is transferred back to the main reactor and the internal temperature is maintained at 70°C. The anchor stirrer speed is adjusted to 400 rpm. The bismuth ion complex powder (such as bismuth ammonium citrate) of the formula is slowly and evenly added over 20-30 minutes through the powder feeder to avoid powder agglomeration or sedimentation. After all the powder has been added, the temperature is maintained and mechanical stirring is kept at 400 rpm for 1.5 hours to ensure that the bismuth ion complex is fully dispersed and pre-complexed and activated with the uniformly distributed IQMg organic molybdenum in the oil phase, laying the foundation for synergistic film formation in the subsequent friction process. S4. Final mixing of functional additives: Under the above temperature and stirring conditions (70℃, 400rpm), add the antioxidant (such as amine antioxidant Irganox L57) and extreme pressure anti-wear agent (such as tricresyl phosphate) in the formula amount in sequence. Each additive is added at an interval of 5-10 minutes to ensure that it is initially dispersed before adding the next one. After all additives are added, continue stirring for 30 minutes to make all components fully mixed and uniform, so as to obtain the final crude lubricating composition. S5. Homogenization and Finished Product Processing: The crude lubricating composition obtained in S4 is cooled to below 40°C through a heat exchanger, and then pumped into a high-pressure homogenizer for homogenization at 80MPa. This process is repeated twice to further pulverize any possible micro-aggregates, ensuring the product's ultra-fine particle size and long-term storage stability. Finally, the homogenized product is filtered through a bag filter with a precision of 5-10μm to remove any trace mechanical impurities, resulting in a clear and transparent molybdenum-bismuth biatomic synergistic lubricating composition. Finally, it undergoes quality inspection and packaging.

[0021] Specific implementation method: By systematically optimizing the addition ratio of molybdenum and bismuth and adjusting their total concentration to the optimal range, this formulation maximizes the synergistic effect of the two. The layered slip characteristics of MoS2 and the lattice filling effect of Bi2S3 achieve efficient coupling at the molecular level, thereby constructing a highly dense nanocomposite lubricating film with excellent thermodynamic stability in situ on the friction surface. This composite film not only significantly reduces the friction coefficient between friction pairs, but also exhibits excellent anti-wear ability and extreme pressure bearing performance due to its tough composite structure. At the same time, the optimized component system also endows the lubricant with excellent oxidation stability, which can effectively inhibit oil deterioration at high temperatures. It achieves a perfect balance of four key properties: low friction, high anti-wear, strong extreme pressure, and long-term stability, making it particularly suitable for advanced industrial equipment and high-end working conditions with extreme requirements for equipment reliability, operating efficiency, and maintenance cycle. Example

[0022] The difference between this embodiment and Embodiments 1-2 is that a molybdenum-bismuth biatomic synergistic lubricating composition is composed of the following components in parts by weight: 90.5 parts of GTL base oil, 4 parts of IQMg ionic liquid organic molybdenum, 2 parts of bismuth ion complex, 1 part of dispersant stabilizer, 1.5 parts of antioxidant, and 1 part of extreme pressure anti-wear agent; A method for preparing a molybdenum-bismuth diatomic synergistic lubricating composition specifically includes the following steps: S1. Base oil preheating and stabilizer dispersion: The prescribed amount of GTL base oil is transferred to the main reactor equipped with a jacketed heating system and an anchor stirrer via a transfer pump. The jacket heating is started to raise the oil temperature to and maintain it at 70°C. Then the anchor stirrer is started and its speed is controlled within the range of 200-300 rpm. Under this gentle stirring condition, the prescribed amount of dispersion stabilizer is added slowly and evenly. After the addition is completed, the mixture is kept warm and stirred for 30 minutes until the dispersion stabilizer is completely dissolved and forms a homogeneous and stable system in the base oil. S2. Fine dispersion of IQMg ionic liquid organic molybdenum: Maintaining the temperature (70℃) and inert atmosphere protection of step S1, the speed of the anchor stirrer in the main reactor is increased to 400-500 rpm to form a stronger vortex. The formulated amount of IQMg ionic liquid organic molybdenum is slowly and evenly injected into the reaction system through a precision metering pump. After the feeding is completed, the material is pumped from the main reactor to a pipeline high-shear dispersing emulsifier and circulated at a high shear rate of 12,000 rpm for 15 minutes to achieve primary emulsification and dispersion. Then, the material is introduced into an ultrasonic reactor for deep dispersion. The ultrasonic power is set to 1000W and the process is continued at 70℃ for 45 minutes. This two-step dispersion process ensures that IQMg ionic liquid organic molybdenum is stably and uniformly dispersed at the nanoscale in the oil phase. S3. Blending and reaction of bismuth ion complex: The deeply dispersed material is transferred back to the main reactor and the internal temperature is maintained at 70°C. The anchor stirrer speed is adjusted to 400 rpm. The bismuth ion complex powder (such as bismuth ammonium citrate) of the formula is slowly and evenly added over 20-30 minutes through the powder feeder to avoid powder agglomeration or sedimentation. After all the powder has been added, the temperature is maintained and mechanical stirring is kept at 400 rpm for 1.5 hours to ensure that the bismuth ion complex is fully dispersed and pre-complexed and activated with the uniformly distributed IQMg organic molybdenum in the oil phase, laying the foundation for synergistic film formation in the subsequent friction process. S4. Final mixing of functional additives: Under the above temperature and stirring conditions (70℃, 400rpm), add the antioxidant (such as amine antioxidant Irganox L57) and extreme pressure anti-wear agent (such as tricresyl phosphate) in the formula amount in sequence. Each additive is added at an interval of 5-10 minutes to ensure that it is initially dispersed before adding the next one. After all additives are added, continue stirring for 30 minutes to make all components fully mixed and uniform, so as to obtain the final crude lubricating composition. S5. Homogenization and Finished Product Processing: The crude lubricating composition obtained in S4 is cooled to below 40°C through a heat exchanger, and then pumped into a high-pressure homogenizer for homogenization at 80MPa. This process is repeated twice to further pulverize any possible micro-aggregates, ensuring the product's ultra-fine particle size and long-term storage stability. Finally, the homogenized product is filtered through a bag filter with a precision of 5-10μm to remove any trace mechanical impurities, resulting in a clear and transparent molybdenum-bismuth biatomic synergistic lubricating composition. Finally, it undergoes quality inspection and packaging.

[0023] Specific implementation method: As the organic molybdenum content in the formulation increases from 2% to 4%, the extreme pressure performance (sintering load PD value) of the lubricating composition shows a steady upward trend. However, the anti-wear performance does not show a linear improvement. Its performance is even slightly inferior to Example 2, which has a better molybdenum-bismuth ratio. That is, when the molybdenum content exceeds the optimal synergistic ratio, the excessive molybdenum component may affect its uniform spread on the friction surface and the formation of the optimal composite film structure to a certain extent. This makes the formulation accurately target its application scenario, strengthen the failure resistance under harsh conditions of huge instantaneous impact load and easy boundary lubrication and extreme pressure lubrication, prioritize the survival ability of equipment under the worst conditions, and prevent serious wear or welding accidents caused by instantaneous rupture of the oil film.

[0024] The molybdenum-bismuth biatomic synergistic lubricating compositions prepared in Examples 1-3 were subjected to lubrication tests, and compared with commercially available lubricating compositions. The tests were conducted strictly in accordance with the national standard GB / T3142, using a four-ball friction and wear tester. The test conditions were: room temperature, spindle speed 1450 rpm, test duration 30 min, load 392 N, room temperature (25±2℃), spindle speed 1450 rpm, test duration 30 min, and initial load 392 N. The main evaluation indicators included: coefficient of friction: real-time monitoring and recording of the average value, directly reflecting the friction reduction ability of the lubricant; sintering load (PD value): determined by gradually increasing the load until the steel balls fused together, used to evaluate the ultimate compressive strength and extreme pressure performance of the lubricant, to determine the influence of the lubricating compositions of the present invention on equipment lubrication, and to observe the lubrication performance of the lubricating compositions at different ratios. The results are shown in Table 1. Table 1 Friction Index Wear scar diameter (mm) oxidation induction period min Sintering load PD(N) Example 1 0.048 0.38 420 696 Example 2 0.041 0.28 435 784 Example 3 0.044 0.31 450 804 Comparative Example 0.065 0.52 380 618 As shown in the table above, by adjusting the molybdenum-bismuth ratio, this invention can directionally control the performance focus of the lubricant: Example 2 achieves the best balance of comprehensive performance and is suitable for mainstream high-end working conditions that pursue high efficiency and long service life; while Example 3 specifically enhances extreme pressure performance, providing more robust protection for extreme and harsh environments such as impact loads. Therefore, Example 2 is the preferred embodiment of this invention, and compared with commercially available lubricating compositions, it achieves high efficiency and energy saving and long-term reliable operation of equipment, and is particularly suitable for mainstream high-end working conditions such as high-end equipment manufacturing, precision transmission systems and heavy-duty industrial applications that have stringent requirements for lubrication performance.

[0025] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A molybdenum-bismuth biatomic synergistic lubricating composition, characterized in that, It is composed of the following components by weight: 85-95 parts GTL base oil, 2-6 parts IQMg ionic liquid organic molybdenum, 1-4 parts bismuth ion complex, 0.5-2 parts dispersant stabilizer, 0.5-1.5 parts antioxidant and 0.5-1.5 parts extreme pressure anti-wear agent.

2. The molybdenum-bismuth biatomic synergistic lubricating composition according to claim 1, characterized in that, The IQMg ionic liquid organic molybdenum is an organic molybdenum compound containing an imidazole quaternary ammonium salt structure, and the bismuth ion complex is a complex formed by bismuth and an organic ligand.

3. The molybdenum-bismuth biatomic synergistic lubricating composition according to claim 1, characterized in that, The dispersant and stabilizer is one or a combination of two of polyisobutylene succinimide and alkylbenzene sulfonate, the antioxidant is an amine or phenolic antioxidant, and the extreme pressure anti-wear agent is one or a combination of two of phosphate ester and thiophosphate ester.

4. A method for preparing a molybdenum-bismuth biatomic synergistic lubricating composition according to any one of claims 1-3, characterized in that, Specifically, the following steps are included: S1. Base oil preheating and stabilizer dispersion: Pump the prescribed amount of GTL base oil into the main reactor, heat it to 60-80℃ and keep it at a constant temperature, and slowly add the prescribed amount of dispersion stabilizer. S2, IQMg ionic liquid organic molybdenum fine dispersion: Under a protective atmosphere, the formulated amount of IQMg ionic liquid organic molybdenum is slowly and uniformly added through a metering pump. Then, the material is transferred to a pipeline high-shear dispersing emulsifier for primary dispersion. Subsequently, the material is pumped into an ultrasonic reactor for deep dispersion, and ultrasonic dispersion is carried out at 60-80℃ for 30-60 minutes. S3. Blending and reaction of bismuth ion complex: Transfer the material back to the main reactor and slowly add the bismuth ion complex powder of the formula amount through the powder feeder. After the feeding is completed, keep the temperature and mechanically stir and mix for 1-2 hours to make the bismuth ion complex fully dispersed and pre-react with other components in the system. S4. Final mixing of functional additives: While maintaining stirring and temperature, add the antioxidant and extreme pressure anti-wear agent in the formula amount in sequence, and continue stirring and mixing evenly to obtain a uniform mixture of all components; S5. Homogenization and Finished Product Processing: The above mixture is cooled to below 40°C and then pumped into a high-pressure homogenizer for homogenization. The final product is filtered through a bag filter to obtain a molybdenum-bismuth biatomic synergistic lubricating composition.

5. The method for preparing a molybdenum-bismuth biatomic synergistic lubricating composition according to claim 4, characterized in that, The main reactor in S1 is equipped with a jacketed heater and an anchor stirrer. After heating, the anchor stirrer inside is started. The speed of the anchor stirrer is 200-300 rpm, and it is continuously stirred for 30-45 minutes until the material inside is completely dissolved and evenly dispersed.

6. The method for preparing a molybdenum-bismuth biatomic synergistic lubricating composition according to claim 4, characterized in that, In step S2, the stirring speed of the main reactor is increased to 400-500 rpm, the shear rate of the inline high-shear dispersion emulsifier is 10000-15000 rpm, the circulation process is 15-20 minutes, and the ultrasonic power of the ultrasonic reactor is set to 800-1200W.

7. The method for preparing a molybdenum-bismuth biatomic synergistic lubricating composition according to claim 4, characterized in that, The mechanical stirring speed of the anchor-type agitator inside the main reactor in S3 is 300-400 rpm, and the feeding time of the powder feeder is controlled within 20-30 minutes.

8. The method for preparing a molybdenum-bismuth biatomic synergistic lubricating composition according to claim 4, characterized in that, Each additive in S4 is added at intervals of 5-10 minutes, and stirring continues for 30-45 minutes after the addition is complete.

9. The method for preparing a molybdenum-bismuth biatomic synergistic lubricating composition according to claim 4, characterized in that, The pressure of the high-pressure homogenizer in the S5 is 50-100MPa, and the cycle is 2-3 times.

10. A method for preparing a molybdenum-bismuth biatomic synergistic lubricating composition according to any one of claims 4-9, characterized in that, It also includes the application of molybdenum-bismuth biatomic synergistic lubricating compositions in the preparation of gear oils, engine oils, hydraulic oils or metalworking fluids.