Antioxidant low-residue long-acting rolling bearing lubricating oil and preparation method thereof
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- YANTAI GUANGHE LUBRICATING OIL CO LTD
- Filing Date
- 2026-06-02
- Publication Date
- 2026-07-03
Abstract
Description
Technical Field
[0001] This invention relates to the field of special lubricating materials technology, specifically to a long-lasting rolling bearing lubricating oil with anti-oxidation and low residue, and its preparation method. Background Technology
[0002] In modern precision manufacturing, textile printing and dyeing, and food processing, the lubrication of rolling bearings faces extremely demanding requirements. Existing bearing lubricants are prone to oil stains and oil spots after high-speed operation due to the evaporation of base oil and the precipitation of additives, which can contaminate end products. In addition, under high temperature and high speed conditions, traditional lubricating oil films are prone to rupture, splashing and loss, resulting in a sharp reduction in lubrication life. Traditional solutions often use physical blending to add extreme pressure agents and antioxidants containing metal ions.
[0003] However, these additives have poor high and low temperature compatibility with base oils, and are prone to precipitation and ash and stains after long-term standing or thermal cycling. Existing stain-free or high-cleanliness formulations often achieve this by drastically reducing the amount of extreme pressure anti-wear agents, resulting in a significant decrease in heavy-load lubrication performance and wear resistance life, making it difficult to achieve both low surface residue and extreme pressure lubrication performance that meets heavy-load standards in high-speed precision bearings. Summary of the Invention
[0004] The purpose of this invention is to provide a long-lasting rolling bearing lubricating oil with low oxidation and residue, and its preparation method. This addresses the problems of conventional lubricating oils in the prior art, such as the tendency for the oil film to rupture and splash under high-temperature and high-speed conditions, and the easy precipitation of metal ion-containing additives that generate ash and stains, making it difficult to simultaneously achieve high cleanliness and residue-free operation with strong lubrication. Specifically, the technical solution of this invention is as follows:
[0005] An antioxidant, low-residue, long-lasting rolling bearing lubricant, comprising the following raw materials in parts by weight: 85-95 parts of stain-free modified synthetic base oil, 2-6 parts of ashless extreme pressure anti-wear agent, 0.5-2 parts of ashless polymeric dispersant, 1-4 parts of high-temperature antioxidant, 0.5-2 parts of rust and corrosion inhibitor, 0.5-1.5 parts of seal compatibility agent, and 0.005-0.05 parts of silicone-free defoamer.
[0006] Preferably, the preparation steps of the stain-free modified synthetic base oil are as follows: S1, metallocene-catalyzed polyα-olefin and polyol ester are added to a reaction vessel at a mass ratio of 3-5:1, and the temperature is raised to 60-80℃ under nitrogen protection, and stirred at a speed of 500-800r / min for 1-2h; S2, while maintaining the temperature of the reaction system, the mixture is ultrasonically dispersed for 30-60min, wherein the ultrasonic frequency is 20-30kHz and the ultrasonic power is 300-500W, to obtain the stain-free modified synthetic base oil.
[0007] Preferably, the metallocene-catalyzed poly-α-olefin in step S1 is metallocene PAO8; the polyol ester in step S1 is pentaerythritol ester.
[0008] Preferably, the ashless extreme pressure anti-wear agent is any one or a combination of alkyl dithiophosphate ammonium salt, isobutylene sulfide, or dibutyl phosphite.
[0009] Preferably, the high-temperature antioxidant is a mixture of hindered phenolic antioxidant and alkyl diphenylamine antioxidant, and the mass ratio of the hindered phenolic antioxidant to the alkyl diphenylamine antioxidant is 1:1.
[0010] Preferably, the hindered phenolic antioxidant in the mixture is 2,6-di-tert-butyl-p-cresol; and the alkyl diphenylamine antioxidant in the mixture is 4,4'-dioctyl diphenylamine.
[0011] Preferably, the rust inhibitor is dodecenyl succinate half-ester; the sealant compatibility agent is diisooctyl adipate; and the silicone-free defoamer is a polyacrylate type defoamer.
[0012] Preferably, the procedure specifically includes the following steps:
[0013] Step 1: Weigh each raw material according to the weight parts, put the stain-free modified synthetic base oil into the blending tank, heat to 45℃, and stir for 15 minutes at a shear rate of 400r / min;
[0014] Step 2: Heat to 65-70℃, add high-temperature oxidizing agent, rust inhibitor and corrosion inhibitor and ashless polymer dispersant in sequence, increase the speed to 700r / min and stir for 30min;
[0015] Step 3: Cool to 55-60℃, add ashless extreme pressure anti-wear agent and sealant compatibility agent, and stir at a shear rate of 900r / min for 35min;
[0016] Step 4: Cool down to below 30℃, add silicone-free defoamer, stir at 250r / min, turn on the vacuum defoaming system, treat for 20min under gauge pressure ≤-0.08MPa, and then pass through two-stage fine filtration with 200 mesh and 1μm filter elements to obtain antioxidant, low-residue long-life rolling bearing lubricating oil.
[0017] The beneficial effects of this invention are as follows:
[0018] 1. This invention improves microcompatibility by combining metallocene-catalyzed polyα-olefins with polyol esters and ultrasonic dispersion treatment; it constructs an ashless system by combining ashless extreme pressure anti-wear agents and ashless polymeric dispersants, which improves the defects of oil spots and ash precipitation under thermal cycling of metal additives; the formulation takes into account lubrication and achieves high cleanliness and low residue, reducing the pollution of end products.
[0019] 2. This invention employs a multi-stage cooling and blending process, adding ashless extreme pressure anti-wear agent and sealant compatibility agent in the low to medium temperature range; combined with ashless polymeric dispersant, the lubricating oil maintains high cleanliness while improving heavy-duty performance and wear resistance life;
[0020] 3. This invention introduces a silicone-free defoamer and combines it with vacuum defoaming treatment, which reduces the risk of lubricant splashing and loss; combined with a high-temperature oxidizing agent, it ensures that the lubricating oil remains uniform and clear after experiencing hot and cold cycles, without producing turbidity or stratification, thus improving the long-term stability of the blended formula. Detailed Implementation
[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below. The stain-free modified synthetic base oil described in this solution refers to a base oil system that, after undergoing high-temperature and high-speed shearing conditions, does not exhibit significant carbonization or carbon deposits, does not produce solid residues of the varnish film, and leaves no visible oil spots on the metal surface after high-temperature volatilization. The described embodiments are merely some embodiments of the present invention, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.
[0022] Example 1:
[0023] This embodiment provides a long-lasting rolling bearing lubricant with low oxidation and low residue. By weight, the components are: 91.29 parts of stain-free modified synthetic base oil, 4.00 parts of ashless extreme pressure anti-wear agent, 1.00 parts of ashless polymeric dispersant, 2.00 parts of high-temperature oxidation resistant agent, 1.00 parts of rust and corrosion inhibitor, 0.70 parts of seal compatibility agent, and 0.01 parts of silicone-free defoamer.
[0024] The stain-free modified synthetic base oil is prepared according to the following steps: S1: Weigh 73.03 parts of metallocene PAO8 and 18.26 parts of pentaerythritol ester and add them to the reactor. Under nitrogen protection, heat to 70°C and stir at 650 r / min for 90 min to obtain a mixed system. This mixed system serves as the basis for subsequent ultrasonic dispersion to ensure that the polyol ester and metallocene-catalyzed polyα-olefin are initially mixed and uniformly distributed on a macroscopic scale; S2: Maintain the temperature at 70°C and perform ultrasonic dispersion on the above mixed system for 45 min. The ultrasonic frequency is 25 kHz and the ultrasonic power is 400 W to obtain the stain-free modified synthetic base oil.
[0025] The resulting stain-free modified synthetic base oil was used for blending, as follows:
[0026] Step 1: Add the stain-free modified synthetic base oil to the blending tank, heat to 45°C, and stir at 400 r / min for 15 min to obtain the first intermediate product. This first intermediate product achieves the initial activation and thermal stability of the base oil, providing a good matrix environment for the uniform integration of subsequent additives.
[0027] Step 2: Heat to 68℃, then add the high-temperature oxidizing agent, rust inhibitor, and ashless polymeric dispersant sequentially. Stir at 700 r / min for 30 min to obtain the second intermediate product. This second intermediate product completes the construction of the anti-oxidation, rust prevention, and dispersion system, ensuring the system stability of the lubricating oil under high temperature and long-term operation. The high-temperature oxidizing agent is a complex of 2,6-di-tert-butyl-p-cresol and 4,4'-dioctyldiphenylamine, with a mass ratio of 1:1. The rust inhibitor is dodecenyl succinate half-ester, specifically dodecenyl succinate monoisopropyl ester generated by the reaction of dodecenyl succinate and isopropanol. The ashless polymeric dispersant is polyisobutylene succinimide.
[0028] Step 3: Cool to 58℃, add ashless extreme pressure anti-wear agent and seal compatibility agent, stir at 900 r / min for 35 min to obtain the third intermediate product. This third intermediate product further enhances the extreme pressure anti-wear ability and seal compatibility, enabling each active component to form a stable micelle structure in the base oil. The ashless extreme pressure anti-wear agent is an alkyl dithiophosphate ammonium salt, specifically an isopropylamine salt of diisooctyl dithiophosphate. The seal compatibility agent is diisooctyl adipate. Step 4: Cool to 25℃, add polyacrylate type silicone-free defoamer, stir at 250 r / min, control the vacuum degree at -0.09 MPa, defoam for 20 min, and then filter through a two-stage filter with a 200 mesh and a 1 μm filter element to obtain the finished lubricating oil.
[0029] Example 2:
[0030] The lubricating oil provided in this embodiment has the following composition: 95.00 parts of stain-free modified synthetic base oil, 2.00 parts of ashless extreme pressure anti-wear agent, 0.50 parts of ashless polymeric dispersant, 1.00 parts of high-temperature oxidation resistant agent, 0.99 parts of rust inhibitor and corrosion inhibitor, 0.50 parts of sealant compatibility agent, and 0.01 parts of silicone-free defoamer;
[0031] The preparation steps of the stain-free modified synthetic base oil are as follows: S1: Weigh 79.17 parts of metallocene PAO8 and 15.83 parts of pentaerythritol ester and add them to the reactor. Under nitrogen protection, heat to 60℃ and stir at 500 r / min for 60 min to obtain a mixed system, ensuring that the components are initially mixed macroscopically; S2: Maintain the temperature at 60℃ and ultrasonically disperse the above mixed system for 30 min at an ultrasonic frequency of 20 kHz and an ultrasonic power of 300 W to obtain the stain-free modified synthetic base oil;
[0032] The blending steps are the same as in Example 1, except that the temperature in step 2 is controlled at 65°C and the temperature in step 3 is controlled at 55°C. The effects of the first intermediate, second intermediate and third intermediate obtained in each step are the same as in Example 1; the ashless extreme pressure anti-wear agent is isobutylene sulfide.
[0033] Example 3:
[0034] The lubricating oil provided in this embodiment has the following composition: 88.27 parts of stain-free modified synthetic base oil, 5.00 parts of ashless extreme pressure anti-wear agent, 1.50 parts of ashless polymeric dispersant, 3.00 parts of high-temperature oxidation resistant agent, 1.20 parts of rust inhibitor and corrosion inhibitor, 1.00 parts of sealant compatibility agent, and 0.03 parts of silicone-free defoamer;
[0035] The preparation steps of the stain-free modified synthetic base oil are as follows: S1: Weigh 66.20 parts of metallocene PAO8 and 22.07 parts of pentaerythritol ester and add them to the reactor. Under nitrogen protection, heat to 75℃ and stir at 700 r / min for 100 min to obtain a mixed system, ensuring that the components are initially mixed macroscopically; S2: Maintain the temperature at 75℃ and ultrasonically disperse the above mixed system for 50 min at an ultrasonic frequency of 28 kHz and an ultrasonic power of 450 W to obtain the stain-free modified synthetic base oil;
[0036] The mixing steps are the same as in Example 1, except that the temperature in step 2 is controlled at 70°C and the temperature in step 3 is controlled at 60°C. The effects of the first intermediate, second intermediate and third intermediate obtained in each step are the same as in Example 1; the ashless extreme pressure anti-wear agent is dibutyl phosphite.
[0037] Example 4:
[0038] The lubricating oil provided in this embodiment has the following composition: 85.05 parts of stain-free modified synthetic base oil, 6.00 parts of ashless extreme pressure anti-wear agent, 2.00 parts of ashless polymeric dispersant, 4.00 parts of high-temperature oxidation resistant agent, 1.40 parts of rust inhibitor and corrosion inhibitor, 1.50 parts of sealant compatibility agent, and 0.05 parts of silicone-free defoamer;
[0039] The preparation steps of the stain-free modified synthetic base oil are as follows: S1: Weigh 68.04 parts of metallocene PAO8 and 17.01 parts of pentaerythritol ester and add them to the reaction vessel. Under nitrogen protection, heat to 80℃ and stir at 800 r / min for 120 min; S2: Maintain the temperature at 80℃ and ultrasonically disperse for 60 min at an ultrasonic frequency of 30 kHz and an ultrasonic power of 500 W to obtain the stain-free modified synthetic base oil;
[0040] The mixing steps are the same as in Example 1, except that the temperature in step 2 is controlled at 70°C and the temperature in step 3 is controlled at 60°C; the rust inhibitor is dodecenyl succinate half ester, specifically dodecenyl succinate monoisopropyl ester generated by the reaction of dodecenyl succinate and isopropanol, and the sealant compatibility agent is diisooctyl adipate.
[0041] Comparative Example 1:
[0042] The difference between this comparative example and Example 1 is that the ultrasonic dispersion treatment in step S2 is omitted when preparing the stain-free modified synthetic base oil. After S1, it is used directly as a base oil. The other raw material composition, blending steps and process parameters are exactly the same as those in Example 1.
[0043] Comparative Example 2:
[0044] The difference between this comparative example and Example 1 is that, in the preparation of the stain-free modified synthetic base oil, the mass ratio of metallocene PAO8 to pentaerythritol ester was changed from 4:1 to 6:1, that is, 91.29 parts of base oil were prepared using 78.25 parts of metallocene PAO8 and 13.04 parts of pentaerythritol ester. Other operating steps and process parameters were exactly the same as in Example 1.
[0045] Comparative Example 3:
[0046] The difference between this comparative example and Example 1 is that the ashless polymeric dispersant is omitted, while the other raw material composition, steps, and process parameters are exactly the same as in Example 1; in order to maintain the consistency of the total amount, the amount of base oil is adjusted from 91.29 parts to 92.29 parts.
[0047] Comparative Example 4:
[0048] The difference between this comparative example and Example 1 is that the ashless extreme pressure anti-wear agent alkyl dithiophosphate ammonium salt is replaced with zinc dialkyl dithiophosphate, and the amount added is still 4.00 parts. The other raw material composition, steps and process parameters are exactly the same as those in Example 1.
[0049] Comparative Example 5:
[0050] The difference between this comparative example and Example 1 is that: in step 4, vacuum degassing is not performed, and the mixture is stirred at 250 r / min for 20 min under normal pressure. The other raw material composition, steps and process parameters are exactly the same as in Example 1.
[0051] Comparative Example 6:
[0052] The difference between this comparative example and Example 1 is that the cooling condition in step 3 is cancelled, the system temperature is maintained at 75°C when adding ashless extreme pressure anti-wear agent and sealant compatibility agent, and the other raw material composition, steps and process parameters are exactly the same as in Example 1.
[0053] Performance Testing and Datasheets
[0054] The testing method is briefly described below:
[0055] Volatile mass loss rate: After sampling, the sample is placed in a 120℃ forced-air drying oven for 100h, and the mass change before and after the test is measured. The volatile loss is calculated as a percentage.
[0056] High-speed centrifugation splash loss rate: A quantitative sample was added to a deep groove ball bearing assembly with an inner diameter of 20 mm to 50 mm, and the sample was run at 10000 r / min for 30 min. The proportion of the splash loss mass to the initial mass was then determined.
[0057] Extreme pressure anti-wear performance: Four-ball friction test was conducted according to GB / T3142, and the wear scar diameter was tested under the non-seizure load PB, sintering load PD and 40kg load for 60min.
[0058] Thermal cycling stability: Cycle between -20℃ and 120℃ 30 times and observe whether turbidity, layering and precipitation occur;
[0059] The performance test data is as follows:
[0060] Table 1. Lubricating Oil Performance Test Data
[0061] sample Volatilization mass loss rate at 120℃ for 100 hours / % 10000r / min splash loss rate / % PB / N PD / N Wear scar diameter / mm Appearance after 30 cycles of hot and cold water Example 1 0.42 1.8 882 3136 0.36 Clear, without layering or sediment. Example 2 0.61 2.6 784 2450 0.43 Clear, without layering or sediment. Example 3 0.48 2.0 833 3089 0.38 Clear, without layering or sediment. Example 4 0.55 2.3 860 3089 0.39 Slight thickening, no stratification, no sedimentation Comparative Example 1 1.36 4.9 686 1960 0.52 Slightly cloudy Comparative Example 2 1.08 3.8 735 2450 0.47 Clear with slight oil residue Comparative Example 3 0.74 5.6 637 1568 0.58 Slightly turbid, with a small amount of precipitation. Comparative Example 4 0.97 3.5 823 2940 0.41 Trace amounts of ash deposited Comparative Example 5 0.45 6.2 882 3136 0.37 Clear, with traces of residual air bubbles. Comparative Example 6 0.69 2.7 735 2450 0.46 Clear, without layering or sediment.
[0062] As can be seen from the comparison of the test results of Example 1 and Comparative Example 1 in Table 1, after omitting the ultrasonic dispersion step in the preparation of stain-free modified synthetic base oil, the volatile mass loss rate, splash loss rate, and wear data all show a deterioration trend. The underlying reason is that ultrasonic dispersion can make the polar ester groups in pentaerythritol ester more evenly distributed in metallocene PAO8, reducing the local enrichment area. Without this step, the internal compatibility of the base oil decreases, the local polar components are unevenly dispersed, and micro-area aggregation is more likely to form during heating and shearing, the oil film continuity decreases, and it is easier to be thrown out at high speed, thus increasing the splash loss rate. At the same time, the boundary film thickness distribution is uneven, the load-bearing capacity of the contact area decreases, and the PB, PD, and wear scar diameter data deteriorate.
[0063] As can be seen from the comparison of the test results of Example 1 and Comparative Example 2 in Table 1, after changing the mass ratio of metallocene PAO8 to pentaerythritol ester from 4:1 to 6:1, the volatile mass loss rate and splash loss rate increased, and the extreme pressure anti-wear performance also decreased. The underlying reason is that when the amount of pentaerythritol ester is reduced, the polar anchoring sites of the system decrease, the adsorption capacity of the base oil on the metal surface weakens, and the boundary oil film formed is thinner, resulting in a decrease in the oil film retention capacity under high-speed conditions. At the same time, insufficient ester groups will weaken the dissolution and dispersion of ashless additives, reduce the supply of active components in the friction zone, and therefore reduce PB and PD, and increase the wear scar diameter.
[0064] As can be seen from the comparison of the test results of Example 1 and Comparative Example 3 in Table 1, after omitting the ashless polymeric dispersant, the splash loss rate, PB, PD and wear scar diameter data all deteriorated significantly, and slight precipitation also occurred after thermal cycling. The underlying reason is that polyisobutylene succinimide can improve the dispersion stability of hindered phenols, amine antioxidants and extreme pressure agents in base oil, and can enhance their adsorption on metal surfaces through polar head groups. Without this component, the additives are more likely to be locally enriched during thermal cycling, resulting in a decrease in system homogeneity. The active molecules that can be continuously supplied to the friction interface are reduced, and the boundary film formed is discontinuous, thus reducing the load-bearing capacity and aggravating wear.
[0065] As can be seen from the comparison of the test results of Example 1 and Comparative Example 4 in Table 1, after replacing the ashless extreme pressure anti-wear agent with a zinc-containing extreme pressure agent, the volatile mass loss rate and splash loss rate increased, and trace amounts of ash deposition appeared after thermal cycling. The underlying reason is that zinc-containing additives are prone to forming metal salt decomposition products in the high-temperature friction zone and under thermo-oxygen environment. These products will bring residue and ash after being deposited on the surface. At the same time, the compatibility of metal salt products with the ester base oil used in this invention is lower than that of the ashless system, and trace amounts are more likely to be precipitated under long-term thermal cycling. Although PB and PD remain at a high level, the cleanliness and low residue performance decrease, which is not conducive to the cleanliness requirements of food, textiles and precision electromechanical equipment.
[0066] As can be seen from the comparison of the test results of Example 1 and Comparative Example 5 in Table 1, after removing vacuum degassing, the volatile mass loss rate and the four-ball test data did not change much, but the splash loss rate increased macroscopically. The underlying reason is that the microbubbles remaining in the oil after atmospheric pressure stirring will weaken the continuity of the oil film, forming local cavities and shear instability during high-speed rotation, making it easier for oil droplets to be thrown out from the lubrication interface. At the same time, the bursting of bubbles will bring about local liquid film fluctuations, making it easier for spray to form on the oil surface, thus significantly increasing the high-speed splash loss rate.
[0067] As can be seen from the comparison of the test results of Example 1 and Comparative Example 6 in Table 1, when the temperature was kept at 75℃ instead of being lowered to 55-60℃ in step 3 before adding the ashless extreme pressure anti-wear agent, the macroscopically visible data of PB, PD, and wear scar diameter deteriorated, and the volatile mass loss rate also increased. The underlying reason is that the stability of alkyl dithiophosphate ammonium salt decreases at 75℃, and some active groups have already decomposed or undergone side reactions during the formulation stage, resulting in a reduction in the effective extreme pressure components entering the friction interface. At the same time, the hydrogen bonding association between the base oil and the additives weakens under high temperature conditions, and the microstructure stability of the system decreases, thus reducing the load-bearing capacity and anti-wear performance.
[0068] Based on the data from Examples 1 to 4 in Table 1, it can be seen that within the defined composition and process range, lubricating oils with low volatility, low splashing, high extreme pressure anti-wear ability, and good thermal cycling stability can be obtained. The comprehensive performance of Example 1 meets the set indicators, indicating that there is an excellent matching relationship between the ratio of metallocene PAO8 to pentaerythritol ester in the base oil, the ultrasonic dispersion conditions, and the subsequent stepwise temperature-controlled blending process.
[0069] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any conventional modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the technical solution of the present invention shall still fall within the protection scope of the technical solution of the present invention.
Claims
1. An oxidation-resistant, low-residue, long-life rolling bearing lubricating oil, characterized in that, It contains the following raw materials by weight: 85-95 parts of stain-free modified synthetic base oil, 2-6 parts of ashless extreme pressure anti-wear agent, 0.5-2 parts of ashless polymeric dispersant, 1-4 parts of high-temperature oxidizing agent, 0.5-2 parts of rust and corrosion inhibitor, 0.5-1.5 parts of sealant compatibility agent, and 0.005-0.05 parts of silicone-free defoamer.
2. The long-life rolling bearing lubricating oil with anti-oxidation and low residue as described in claim 1, characterized in that, The preparation steps of the stain-free modified synthetic base oil are as follows: S1, metallocene-catalyzed polyα-olefin and polyol ester are added to the reaction vessel at a mass ratio of 3-5:1, and the temperature is raised to 60-80℃ under nitrogen protection, and stirred at a speed of 500-800r / min for 1-2h; S2, while maintaining the temperature of the reaction system, the mixture is ultrasonically dispersed for 30-60min, wherein the ultrasonic frequency is 20-30kHz and the ultrasonic power is 300-500W, to obtain the stain-free modified synthetic base oil.
3. The long-life rolling bearing lubricating oil with anti-oxidation and low residue as described in claim 2, characterized in that: The metallocene-catalyzed poly-α-olefin in step S1 is metallocene PAO8; the polyol ester in step S1 is pentaerythritol ester.
4. The long-life rolling bearing lubricating oil with anti-oxidation and low residue as described in claim 1, characterized in that: The ashless extreme pressure anti-wear agent is any one or a combination of alkyl dithiophosphate, isobutylene sulfide, or dibutyl phosphite.
5. The long-life rolling bearing lubricating oil with anti-oxidation and low residue according to claim 1, characterized in that: The ashless polymeric dispersant is polyisobutylene succinimide.
6. The long-life rolling bearing lubricating oil with anti-oxidation and low residue according to claim 1, characterized in that: The high-temperature antioxidant is a mixture of hindered phenolic antioxidant and alkyl diphenylamine antioxidant, and the mass ratio of the hindered phenolic antioxidant to the alkyl diphenylamine antioxidant is 1:
1.
7. The long-life rolling bearing lubricating oil with anti-oxidation and low residue according to claim 6, characterized in that: The hindered phenolic antioxidant in the mixture is 2,6-di-tert-butyl-p-cresol; the alkyl diphenylamine antioxidant in the mixture is 4,4'-dioctyl diphenylamine.
8. The long-life rolling bearing lubricating oil with anti-oxidation and low residue according to claim 1, characterized in that: The rust and corrosion inhibitor is dodecenyl succinate half ester; the sealing compatibility agent is diisooctyl adipate; and the silicone-free defoamer is a polyacrylate type defoamer.
9. The method for preparing the antioxidant, low-residue, long-life rolling bearing lubricating oil according to any one of claims 1-8, characterized in that: Specifically, it includes the following steps: Step 1: Weigh each raw material according to the weight parts, put the stain-free modified synthetic base oil into the blending tank, heat to 45℃, and stir for 15 minutes at a shear rate of 400r / min; Step 2: Heat to 65-70℃, add high-temperature oxidizing agent, rust inhibitor and corrosion inhibitor and ashless polymer dispersant in sequence, increase the speed to 700r / min and stir for 30min; Step 3: Cool to 55-60℃, add ashless extreme pressure anti-wear agent and sealant compatibility agent, and stir at a shear rate of 900r / min for 35min; Step 4: Cool down to below 30℃, add silicone-free defoamer, stir at 250r / min, turn on the vacuum defoaming system, treat for 20min under gauge pressure ≤-0.08MPa, and then pass through two-stage fine filtration with 200 mesh and 1μm filter elements to obtain antioxidant, low-residue long-life rolling bearing lubricating oil.