Silent shock-absorbing film-forming long-acting rust preventive oil for bearings and preparation method thereof

Abstract

This invention relates to the field of metal protection and lubrication materials, and discloses a silent, vibration-damping, film-forming, long-lasting rust-preventive oil for bearings and its preparation method. The rust-preventive oil comprises a base oil, a dynamic borate ester-organosilicon-tungsten bridging synergistic modifier, itaconic acid hydrazine, a dimer ester, calcium petroleum sulfonate, polyisobutylene, a phosphate extreme pressure agent, and an antioxidant. The dynamic borate ester-organosilicon-tungsten bridging synergistic modifier forms a reversible dynamic covalent network of borate esters with phenylboronic acid through a diol-based compound, and then undergoes a confined sol-gel polymerization reaction with vinyltriethoxysilane to form silicon-oxygen segments. These segments are then coordinated and bridged by tungstate and diol groups to construct a three-dimensional coupled structure. The rust-preventive oil of this invention has advantages such as high film density, strong adhesion, good vibration damping and noise reduction effect, and strong rust prevention durability, making it suitable for the storage and operational protection of high-end bearings.

Description

Technical Field

[0001] This invention belongs to the technical field of metal protection and lubrication materials, specifically relating to a silent and vibration-damping film-forming long-lasting rust-preventive oil for bearings and its preparation method. Background Technology

[0002] Bearings, as key transmission components in mechanical equipment, are widely used in precision motors, wind power equipment, rail transportation, and high-end equipment manufacturing. Their operational stability and service life directly affect the overall performance of the machine. During the production, storage, transportation, and service of bearings, the metal surface is susceptible to corrosion from moisture, oxygen, and salt spray in the air. Therefore, they usually need to be coated with rust-preventive oil for protection. Existing bearing rust-preventive oils are mostly composed of mineral oil or synthetic base oil, combined with petroleum sulfonate rust inhibitors, fatty acid salt adsorbents, and antioxidants. Their rust-preventive mechanism mainly relies on the physical isolation effect of the oil film and the adsorption and film-forming effect of polar groups on the metal surface.

[0003] However, the films formed by traditional rust-preventive oil systems are mostly based on physical adsorption, resulting in a relatively loose structure with insufficient density and stability. Under long-term storage or high-humidity environments, oil film migration or localized failure is prone to occur. During bearing transportation and operation, micro-vibrations and impacts are unavoidable. Ordinary oil films cannot effectively absorb and dissipate micro-stress, easily leading to boundary contact and metal micro-wear, thus increasing operating noise. Simultaneously, traditional systems lack a dynamic reversible structure; once a localized film is damaged, rapid reconstruction is difficult, causing protective performance to degrade over time. Some technologies attempt to enhance film-forming ability by introducing organosilicon or metal coordination structures, but these are mostly simple blends or single coordination systems, failing to construct a synergistic structure combining dynamic covalent networks, flexible silicon-oxygen segments, and reversible metal bridging. This makes it difficult to achieve an integrated improvement in stress buffering, adaptive adjustment, and long-term rust prevention under vibration conditions. Therefore, it is necessary to develop a film-forming rust-preventive oil system capable of forming a multi-coupled network structure on the metal surface to meet the comprehensive performance requirements of high-end silent bearings for vibration reduction, noise reduction, and long-term protection. Summary of the Invention

[0004] To overcome the technical challenges of existing bearing rust-preventive oils, such as loose film structure, lack of dynamic self-healing ability, ineffective stress buffering under micro-vibration conditions, and insufficient noise reduction and vibration damping effects, this invention aims to provide a long-lasting, noise-reducing, and vibration-damping film-forming rust-preventive oil for bearings and its preparation method. By constructing a multi-coupled network structure with dynamic adjustment capabilities, it achieves an integrated and synergistic improvement in rust prevention, vibration damping, and noise reduction functions. This invention uses a dynamic borate ester-organosilicon-tungsten bridging synergistic modifier as the core structural building block. It utilizes a reversible dynamic covalent network of borate esters formed by ortho-biphenol compounds and phenylboronic acid, introduces vinyltriethoxysilane for confined sol-gel polymerization to form flexible siloxane segments, and forms a bridging structure through coordination between tungstate and ortho-biphenol groups. Simultaneously, itaconic acid hydrazine is used to construct a multi-site adsorption and hydrogen bond energy dissipation layer, forming a three-dimensional coupled film structure with topological slip capability in the base oil system. This invention can form a dense composite film layer with dynamic self-healing and stress dissipation capabilities on the metal surface, thereby significantly improving rust prevention durability and reducing bearing operating noise.

[0005] The objective of this invention can be achieved through the following technical solutions: A silent, vibration-damping, film-forming, long-lasting rust-preventive oil for bearings, comprising the following raw materials in parts by weight: 68-85 parts base oil; 3-15 parts dynamic borate ester-organosilicon-tungsten bridging synergistic modifier; 0.5-5.0 parts itaconic acid hydrazine; 2-8 parts dimer ester; 1-5 parts calcium petroleum sulfonate; 1-6 parts polyisobutylene; 0.5-3.0 parts phosphate ester extreme pressure agent; and 0.1-1.0 parts antioxidant. The dynamic borate ester-organosilicon-tungsten bridging synergistic modifier is a three-dimensional coupled structure formed by the reversible borate esterification reaction of ortho-biphenol compounds and phenylboronic acid to construct a dynamic covalent network, followed by confined sol-gel condensation with vinyltriethoxysilane to form siloxane segments, and then synergistic modification through coordination bridging of tungstate and ortho-biphenol groups.

[0006] Optionally, the dynamic borate ester-organosilicon-tungsten bridging synergistic modifier comprises the following raw materials in parts by weight: 1-6 parts catechol; 1-5 parts phenylboronic acid; 2-8 parts vinyltriethoxysilane; and 0.2-2.0 parts sodium tungstate.

[0007] Optionally, the preparation method of the dynamically bridging synergistic modified material of borate ester-organosilicon-tungsten includes the following steps: (1) Catechol and phenylboronic acid are mixed and reacted to obtain a dynamic borate esterification intermediate system; (2) Add vinyltriethoxysilane to the dynamic borate esterification intermediate system and carry out polycondensation reaction to obtain a synergistic modification system containing silicon-oxygen segments; (3) Sodium tungstate is added to the synergistic modification system to carry out a bridging reaction, thereby obtaining the dynamic borate ester-organosilicon-tungsten bridging synergistic modified material.

[0008] Optionally, the reaction conditions in step (1) are to stir the reaction at 40-60°C for 1-3 hours.

[0009] Optionally, the reaction conditions for step (2) are: the water content of the system is 0.05 to 0.30% by mass, and the reaction is carried out at 50 to 70°C for 2 to 5 hours.

[0010] Optionally, the reaction conditions for step (3) are to react at 50-80°C for 1-3 hours.

[0011] Optionally, the antioxidant is a mixture of hindered phenolic antioxidants and aromatic amine antioxidants in a mass ratio of 1:0.5 to 1:2.

[0012] Optionally, a silent, vibration-damping, film-forming, long-lasting rust-preventive oil for bearings, the preparation method comprising the following steps: S1, the dynamic borate ester-organosilicon-tungsten bridging synergistic modifier is added to the base oil and pre-dispersed under stirring conditions to obtain a uniform modified dispersion system; S2, itaconic acid hydrazine, dimer ester, calcium petroleum sulfonate, polyisobutylene and phosphate ester extreme pressure agent are added sequentially to the uniform modified dispersion system and mixed to obtain a functional composite system. S3. Add the remaining base oil and antioxidant to the functional composite system, continue stirring and mixing, filter to remove impurities, and obtain the bearing silent vibration damping film-forming long-lasting rust-preventive oil.

[0013] Optionally, the reaction conditions in step S1 are stirring at 60–80°C for 30–90 min at a stirring speed of 300–600 r / min.

[0014] Optionally, the reaction conditions for step S2 are stirring at 70–90°C for 1–2 hours; the reaction conditions for step S3 are stirring at 60–75°C for 30–60 minutes, with a filtration accuracy of 1–5 μm.

[0015] The beneficial effects of this invention are: This invention constructs a triple-coupling system consisting of a dynamic borate ester covalent network, organosilicon confined sol-gel polycondensation segments, and a tungsten-bridged reversible coordination structure. This transforms the film structure from a traditional single physical adsorption film into a three-dimensional topological network structure with dynamic adjustability. The dynamic borate ester bonds endow the film with reversible reconstruction and self-healing capabilities, enabling reversible exchange and recombination in areas of microscopic damage or stress concentration. The flexible siloxane segments formed by organosilicon polycondensation improve the film's density and adhesion, enhancing its resistance to damp heat and salt spray. The tungsten-bridged structure forms a stable anti-wear buffer layer on the metal surface, achieving stress dispersion and energy dissipation under vibration conditions. Simultaneously, itaconic acid hydrazine provides multi-site adsorption and hydrogen bonding synergistic effects, further enhancing the interfacial bonding strength. The resulting composite film combines high density, reversible repair, and buffering energy dissipation capabilities, significantly extending rust prevention time and effectively reducing bearing micro-vibration noise and improving operational stability. Its overall performance is significantly superior to traditional rust-preventive oil systems. Attached Figure Description

[0016] The invention will now be further described with reference to the accompanying drawings.

[0017] Figure 1 Comparison of infrared spectra of catechol and the synergistically modified material of dynamic borate ester-organosilicon-tungsten bridging; Figure 2 A comparison chart showing the salt spray rust prevention time results for samples with different formulation ratios. Detailed Implementation

[0018] The present invention will be further described below with reference to specific embodiments. However, the present invention is not limited to the following embodiments. Equivalent adjustments made without departing from the spirit and essence of the present invention should also be considered to fall within the protection scope of the present invention.

[0019] Example 1: This example verifies that when all components and reaction conditions are at the lower limit of the claims, the system can still form a basic three-dimensional coupled network structure and maintain rust prevention and shock absorption performance.

[0020] S1, 1 part of catechol and 1 part of phenylboronic acid were mixed and stirred at 40°C for 1 h to obtain a dynamic borate esterification intermediate system; 2 parts of vinyltriethoxysilane were added to the system, and the water content of the system was controlled to be 0.05% by mass, and the reaction was carried out at 50°C for 2 h; then 0.2 parts of sodium tungstate were added and the reaction was carried out at 50°C for 1 h to obtain a dynamic borate ester-organosilicon-tungsten bridging synergistic modified material; S2, add 3 parts of dynamic synergistic modifier to 68 parts of base oil and stir for 30 min at 60℃ and 300 r / min for pre-dispersion; then add 0.5 parts of itaconic acid hydrazine, 2 parts of dimer ester, 1 part of petroleum sulfonate calcium, 1 part of polyisobutylene and 0.5 parts of phosphate ester extreme pressure agent in sequence, and stir for 1 h at 70℃ to obtain the functional composite system; S3, add 0.1 parts of antioxidant to the functional composite system, stir at 60℃ for 30 min, and filter with a filtration accuracy of 5μm to obtain a bearing silent vibration damping film-forming long-lasting rust-preventive oil.

[0021] Example 2: This example verifies that when the components and reaction conditions are within the range of the claims, the dynamic topology network formed by the system achieves the best balance between structural integrity and shock absorption and rust prevention performance.

[0022] S1, 3 parts of catechol and 3 parts of phenylboronic acid were mixed and stirred at 50°C for 2 hours to obtain a dynamic borate esterification intermediate system; 5 parts of vinyltriethoxysilane were added, and the water content of the system was controlled to be 0.15% by mass, and the reaction was carried out at 60°C for 3 hours; then 1 part of sodium tungstate was added and the reaction was carried out at 65°C for 2 hours to obtain a dynamic borate ester-organosilicon-tungsten bridging synergistic modified material; Figure 1 The infrared spectrum comparison shows that before modification, catechol exhibits a broad and strong O–H stretching vibration peak near 3400 cm⁻¹, indicating the presence of abundant phenolic hydroxyl structures. After modification, the intensity of this peak significantly weakens and narrows, indicating that some hydroxyl groups participate in the borosilicate esterification reaction to form dynamic covalent bonds. Simultaneously, a new B–O–C characteristic absorption peak appears near 1240 cm⁻¹, and a significant Si–O–Si stretching vibration peak appears near 1090 cm⁻¹, indicating the formation of siloxane segment structures through organosilicon polycondensation. A W–O characteristic peak appears near 865 cm⁻¹, proving that tungstate successfully participates in bridging coordination. These peak position changes indicate that the three-dimensional coupled synergistic modified structure has been successfully constructed. S2, add 9 parts of dynamic synergistic modifier to 76 parts of base oil and stir for 60 min at 70℃ and 450 r / min for pre-dispersion; then add 3 parts of itaconic acid hydrazine, 5 parts of dimer ester, 3 parts of petroleum sulfonate calcium, 4 parts of polyisobutylene and 1.5 parts of phosphate ester extreme pressure agent in sequence, and stir for 1.5 h at 80℃ to obtain a functional composite system; S3, add 0.5 parts of antioxidant to the functional composite system, stir at 65℃ for 45 min, and filter with a filtration accuracy of 3μm to obtain a bearing silent vibration damping film-forming long-lasting rust-preventive oil.

[0023] Example 3: This example verifies whether the system forms a three-dimensional coupled network with a higher crosslinking density when the components and reaction conditions are at the upper limit of the claims, and further improves the film density and shock absorption capacity.

[0024] S1, 6 parts of catechol and 5 parts of phenylboronic acid were mixed and stirred at 60°C for 3 hours to obtain a dynamic borate esterification intermediate system; 8 parts of vinyltriethoxysilane were added, and the water content of the system was controlled at 0.30% by mass, and the reaction was carried out at 70°C for 5 hours; then 2 parts of sodium tungstate were added and the reaction was carried out at 80°C for 3 hours to obtain a dynamic borate ester-organosilicon-tungsten bridging synergistic modified material; S2, add 15 parts of dynamic synergistic modifier to 85 parts of base oil and stir for 90 min at 80℃ and 600 r / min for pre-dispersion; add 5 parts of itaconic acid hydrazine, 8 parts of dimer ester, 5 parts of petroleum sulfonate calcium, 6 parts of polyisobutylene and 3 parts of phosphate ester extreme pressure agent in sequence, stir at 90℃ for 2 h to obtain functional composite system. S3, add 1 part of antioxidant to the functional composite system, stir at 75℃ for 60 min, and filter with an accuracy of 1μm to obtain a silent and shock-absorbing film-forming long-lasting anti-rust oil for bearings.

[0025] Comparative Example 1: This comparative example aims to verify the improvement effect of the system on film density, self-healing and shock absorption and rust prevention when only dynamic borate ester is used as a single modification method.

[0026] S1, mix 3 parts of catechol with 3 parts of phenylboronic acid, stir and react at 50°C for 2 hours to obtain a single modified material of dynamic borate ester; S2, add 9 parts of the dynamic borate ester single modifier to 76 parts of base oil and stir for 60 min at 70℃ and 450 r / min for pre-dispersion; then add 3 parts of itaconic acid hydrazine, 5 parts of dimer ester, 3 parts of petroleum sulfonate calcium, 4 parts of polyisobutylene and 1.5 parts of phosphate ester extreme pressure agent in sequence, and stir at 80℃ for 1.5 h to obtain a functional composite system; S3, add 0.5 parts of antioxidant to the functional composite system, stir at 65℃ for 45 min, and filter with a filtration accuracy of 3μm to obtain a bearing silent vibration damping film-forming long-lasting rust-preventive oil.

[0027] Comparative Example 2: This comparative example aims to verify the comprehensive improvement effect of the system in terms of interfacial adsorption strength, dynamic energy consumption and long-term rust prevention when only organosilicon confined sol polycondensation is used as a single modification method.

[0028] S1, add 5 parts of vinyltriethoxysilane to the reaction system, control the water content of the system to be 0.15% by mass, and react at 60℃ for 3 hours to obtain a single organosilicon modified material; S2, add 9 parts of the organosilicon single modifier to 76 parts of base oil and stir for 60 min at 70℃ and 450 r / min for pre-dispersion; then add 3 parts of itaconic acid hydrazine, 5 parts of dimer ester, 3 parts of petroleum sulfonate calcium, 4 parts of polyisobutylene and 1.5 parts of phosphate ester extreme pressure agent in sequence, and stir for 1.5 h at 80℃ to obtain a functional composite system; S3, add 0.5 parts of antioxidant to the functional composite system, stir at 65℃ for 45 min, and filter with a filtration accuracy of 3μm to obtain a bearing silent vibration damping film-forming long-lasting rust-preventive oil.

[0029] Comparative Example 3: This comparative example aims to verify the effect of removing the organic small molecule itaconic acid hydrazine on the synergistic performance of vibration reduction, energy dissipation, noise reduction, and rust prevention while keeping the dynamic borate ester-organosilicon-tungsten bridging synergistic modification structure unchanged.

[0030] S1, 3 parts of catechol and 3 parts of phenylboronic acid were mixed and stirred at 50°C for 2 hours to obtain a dynamic borate esterification intermediate system; 5 parts of vinyltriethoxysilane were added, and the water content of the system was controlled to be 0.15% by mass, and the reaction was carried out at 60°C for 3 hours; then 1 part of sodium tungstate was added and the reaction was carried out at 65°C for 2 hours to obtain a dynamic borate ester-organosilicon-tungsten bridging synergistic modified material; S2, add 9 parts of dynamic synergistic modifier to 79 parts of base oil and stir for 60 min at 70℃ and 450 r / min for pre-dispersion; then add 5 parts of dimer ester, 3 parts of calcium petroleum sulfonate, 4 parts of polyisobutylene and 1.5 parts of phosphate ester extreme pressure agent in sequence, and stir for 1.5 h at 80℃ to obtain a functional composite system. S3, add 0.5 parts of antioxidant to the functional composite system, stir at 65℃ for 45 min, and filter with a filtration accuracy of 3μm to obtain a bearing silent vibration damping film-forming long-lasting rust-preventive oil.

[0031] Performance testing: 1. Salt spray rust prevention performance test GCr15 bearing steel test pieces were cleaned and degreased sequentially with anhydrous ethanol and petroleum ether, dried to constant weight, weighed, and the initial mass was recorded. The test pieces were completely immersed in the rust-preventive oils prepared in Example 2 and each comparative example for 5 minutes. After being removed, they were allowed to stand at 25°C for 30 minutes to allow the oil film to self-level and form a film. Subsequently, the test pieces were placed in a salt spray test chamber, using a 5% sodium chloride solution, with the salt spray deposition controlled at 1.0–2.0 mL / 80 cm²·h, and the chamber temperature at 35°C, for continuous spraying. The time when red rust appeared on the surface of the test pieces was observed and recorded every 24 hours, and the time when continuous visible red rust first appeared was taken as the salt spray rust prevention time.

[0032] 2. Oil film density and water erosion resistance test After cleaning and drying, the bearing steel sheets were dipped in the rust-preventive oils of Example 2 and the comparative examples, and allowed to stand at room temperature for 30 minutes to form a film. The film-forming test pieces were placed in a constant temperature and humidity chamber and placed at 40°C and 90% relative humidity for 24 hours. After that, they were taken out and the oil film surface was observed for defects such as shrinkage cavities, sagging, cracks, and exposed substrate. Subsequently, the test pieces were placed in a deionized water circulation rinsing device at a water temperature of 25°C and a flow rate of 0.5 m / s for rinsing for 30 minutes. After that, they were taken out and allowed to stand for 10 minutes. The mass difference before and after rinsing was weighed, and the oil film retention rate was calculated. The oil film retention rate and the surface defect conditions were used to characterize the film density and water erosion resistance.

[0033] 3. Vibration damping and noise reduction performance test Select deep groove ball bearings of the same model, clean and dry them, and then add rust-preventive oils from Example 2 and the comparative proportions respectively, ensuring consistent internal lubrication by adding the same amount of oil. Install the bearings on a noise and vibration test bench and run them continuously at 3000 r / min for 30 minutes at 25°C until they reach a stable state. Use a sound level meter to measure the A-weighted sound pressure level at a distance of 10 cm from the outer ring of the bearing, and simultaneously use an accelerometer to collect the vibration signal of the bearing housing and calculate the root mean square value of the vibration acceleration. Record the noise and vibration values ​​during the stable operation phase, and characterize the vibration reduction and noise reduction performance by the amount of noise reduction and vibration reduction.

[0034] 4. Boundary lubrication anti-wear performance test The anti-wear performance of the rust-preventive oils in Example 2 and the comparative examples was evaluated using a four-ball friction and wear tester. The test steel balls were made of GCr15 and were cleaned and dried with anhydrous ethanol before the test. The rust-preventive oil to be tested was added to the oil cup, and the loading conditions were 392N, the rotation speed was 1200r / min, the test time was 60min, and the test temperature was 75℃. After the test, the steel balls were removed, and the wear scar diameter of the three lower balls was measured with a microscope and the average value was taken. At the same time, the surface of the wear scar was observed to see if there were any scratches or adhesive wear characteristics. The average wear scar diameter and wear morphology were used to characterize the boundary lubrication anti-wear ability.

[0035] Table 1. Test results of performance of silent vibration damping film-type long-lasting rust-preventive oil for bearings. As shown in Table 1, Examples 1-3 are significantly better than Comparative Examples 1-3 in terms of salt spray rust prevention time, oil film retention rate, operating noise, root mean square value of vibration acceleration, and diameter of four-ball wear scars. Among them, Example 2 has the most outstanding comprehensive performance, indicating that the dynamic borate ester-organosilicon-tungsten bridging three-dimensional coupling structure constructed in this invention can form a structurally complete, uniformly distributed, and stable composite film system under median conditions.

[0036] Regarding salt spray rust prevention performance, Figure 2The salt spray rust prevention time of Example 2 reached 1280h, which is significantly higher than that of Comparative Example 1 (560h) and Comparative Example 2 (610h). This indicates that a single dynamic borate ester structure or a single organosilicon structure is difficult to form a highly dense protective layer, while the triple coupling network can build a continuous and stable barrier structure on the metal surface. Although Example 3 increased the crosslinking density, its rust prevention time was slightly lower than that of Example 2 due to the excessively dense structure and reduced local flexibility. This indicates that the median structure is more conducive to forming a film that combines density and flexibility.

[0037] Regarding the oil film retention rate, Example 2 achieved 96.4%, which was significantly higher than the comparative examples, indicating that the synergistic effect of dynamic covalent bonds and silicon-oxygen segments improved the adhesion and water erosion resistance of the film. Comparative Examples 1 and 2, lacking multiple bridging structures, were more prone to migration or damage under humid and hot erosion conditions, resulting in a significant decrease in retention rate.

[0038] In terms of vibration damping and noise reduction performance, the operating noise of Example 2 is 67.2 dB, and the root mean square value of vibration acceleration is 0.63 m·s². -2 All values ​​were at their lowest, indicating that the dynamic topological slip structure can achieve stress dispersion and energy dissipation during bearing micro-vibration. In Comparative Example 3, after removing itaconic acid hydrazine, both noise and vibration values ​​increased, indicating that small organic molecules played an important role in constructing the hydrogen bond energy dissipation layer.

[0039] Regarding anti-wear performance, the diameter of the four-ball wear scar in Example 2 was 0.39 mm, which was significantly smaller than that of the other pairs, indicating that the synergistic effect of the tungsten bridging structure and the dynamic network can form a stable anti-wear protective layer under boundary lubrication conditions; the wear scar diameter of the single modified system was significantly increased due to the lack of multiple coupling mechanisms.

[0040] In summary, this invention, through the synergistic construction of a dynamic borate ester covalent network, an organosilicon confined polycondensation structure, and a tungsten bridging coordination structure, forms a three-dimensional coupled film system with adaptive adjustment and energy-absorbing buffering capabilities. It exhibits significant advantages in rust prevention durability, film stability, vibration damping and noise reduction, and wear resistance, verifying the technical effectiveness and comprehensive performance improvement effect of this inventive modified structure.

Claims

1. A silent, vibration-damping, film-forming, long-lasting rust-preventive oil for bearings, characterized in that, The rust-preventive oil comprises the following raw materials in parts by weight: 68-85 parts base oil; 3-15 parts dynamic borate ester-organosilicon-tungsten bridging synergistic modifier; 0.5-5.0 parts itaconic acid hydrazine; 2-8 parts dimer ester; 1-5 parts calcium petroleum sulfonate; 1-6 parts polyisobutylene; 0.5-3.0 parts phosphate ester extreme pressure agent; and 0.1-1.0 parts antioxidant. The dynamic borate ester-organosilicon-tungsten bridging synergistic modifier is a three-dimensional coupled structure formed by the reversible borate esterification reaction of ortho-biphenol compounds and phenylboronic acid to construct a dynamic covalent network, followed by confined sol-gel condensation with vinyltriethoxysilane to form siloxane segments, and then synergistic modification through coordination bridging of tungstate and ortho-biphenol groups.

2. The bearing silent vibration damping film-forming long-lasting rust-preventive oil according to claim 1, characterized in that, The dynamic borate ester-organosilicon-tungsten bridging synergistic modifier comprises the following raw materials in parts by weight: 1-6 parts catechol; 1-5 parts phenylboronic acid; 2-8 parts vinyltriethoxysilane; and 0.2-2.0 parts sodium tungstate.

3. A silent, vibration-damping, film-forming, long-lasting rust-preventive oil for bearings according to claim 1 or 2, characterized in that, The preparation method of the dynamic borate ester-organosilicon-tungsten bridging synergistic modified material includes the following steps: (1) Catechol and phenylboronic acid are mixed and reacted to obtain a dynamic borate esterification intermediate system; (2) Add vinyltriethoxysilane to the dynamic borate esterification intermediate system and carry out polycondensation reaction to obtain a synergistic modification system containing silicon-oxygen segments; (3) Sodium tungstate is added to the synergistic modification system to carry out a bridging reaction, thereby obtaining the dynamic borate ester-organosilicon-tungsten bridging synergistic modified material.

4. The bearing silent vibration damping film-forming long-lasting rust-preventive oil according to claim 3, characterized in that, The reaction conditions for step (1) are stirring at 40-60°C for 1-3 hours.

5. The bearing silent vibration damping film-forming long-lasting rust-preventive oil according to claim 3, characterized in that, The reaction conditions for step (2) are: the water content of the system is 0.05 to 0.30% by mass, and the reaction is carried out at 50 to 70°C for 2 to 5 hours.

6. The bearing silent vibration damping film-forming long-lasting rust-preventive oil according to claim 3, characterized in that, The reaction conditions for step (3) are 50-80℃ for 1-3 hours.

7. The bearing silent vibration damping film-forming long-lasting rust-preventive oil according to claim 1, characterized in that, The antioxidant is composed of hindered phenolic antioxidants and aromatic amine antioxidants in a mass ratio of 1:0.5 to 1:

2.

8. A method for preparing a silent, vibration-damping, film-forming, long-lasting rust-preventive oil for bearings, characterized in that, The preparation method includes the following steps: S1, the dynamic borate ester-organosilicon-tungsten bridging synergistic modifier is added to the base oil and pre-dispersed under stirring conditions to obtain a uniform modified dispersion system; S2, itaconic acid hydrazine, dimer ester, calcium petroleum sulfonate, polyisobutylene and phosphate ester extreme pressure agent are added sequentially to the uniform modified dispersion system and mixed to obtain a functional composite system. S3. Add the remaining base oil and antioxidant to the functional composite system, continue stirring and mixing, filter to remove impurities, and obtain the bearing silent vibration damping film-forming long-lasting rust-preventive oil.

9. The method for preparing a bearing silent vibration damping film-forming long-lasting rust-preventive oil according to claim 8, characterized in that, The reaction conditions for step S1 are stirring at 60-80°C for 30-90 minutes at a stirring speed of 300-600 r / min.

10. The method for preparing a bearing silent vibration damping film-forming long-lasting rust-preventive oil according to claim 8, characterized in that, The reaction conditions for step S2 are stirring at 70–90°C for 1–2 hours; the reaction conditions for step S3 are stirring at 60–75°C for 30–60 minutes, with a filtration accuracy of 1–5 μm.

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