High-performance long-life exposed gear lubricant composition as well as preparation method and application thereof

Abstract

The invention provides a high-performance long-life exposed gear lubricant composition as well as a preparation method and application thereof. The high-performance long-life exposed gear lubricant composition is prepared from the following components in percentage by mass: 81 to 96.3 percent of polyether synthetic oil, 2 to 7.5 percent of ester synthetic oil, 0.1 to 5 percent of an extreme pressure anti-wear agent, 0.03 to 3.0 percent of an ionic liquid anti-wear agent, 0.01 to 0.5 percent of a metal deactivator and 0.3 to 3.0 percent of an anti-rust agent. The synthetic ester helps the ionic liquid and the extreme pressure agent to be stably dispersed in the polyether and play a role; the metal deactivator ensures the compatibility of the ionic liquid; the overall high viscosity base oil ensures effective residence of the additive. Finally, a high-performance open gear oil product with excellent adhesion, extreme pressure wear resistance, thermal stability, corrosion resistance, environmental protection property and the like is obtained, and the comprehensive performance of the open gear oil product is remarkably superior to that of the existing full-oil type synthetic open gear oil technology.

Description

Technical Field

[0001] This invention belongs to the field of lubricant technology, and particularly relates to a high-performance, long-life open gear lubricant composition, its preparation method, and its application. Background Technology

[0002] Open gear oils are generally classified into asphalt-based open gear oils, graphite-based open gear greases, and all-oil open gear oils. Asphalt-based open gear oils are currently banned in Europe and America due to their poor viscosity-temperature properties and anti-fouling ability, and the presence of highly carcinogenic volatile solvents. Graphite-based open gear greases are currently the most widely used products. For example, patent application CN104164277A provides a heavy-duty open gear grease and its preparation method, which is made from base oil, composite aluminum-based grease, graphite, MoS2, etc. It has good adhesion and extreme pressure anti-wear properties, reducing frictional resistance and saving power consumption. However, since graphite and MoS2 are black solid lubricants, they cause many inconveniences for maintenance and on-site cleaning. In addition, its poor low-temperature fluidity also limits its application.

[0003] Synthetic open gear lubricants are typically formulated with high-viscosity synthetic base oils and additives. The combination of high viscosity index synthetic base oils and additives gives them excellent thermal oxidation stability, high and low temperature performance, and extreme pressure anti-wear properties.

[0004] However, in recent years, the trend of increasing the size of mining mills has become significant, and the increase in equipment size and power has exacerbated the thermodynamic challenges.

[0005] (1) The problem of temperature rise is obvious.

[0006] On-site monitoring showed that when the ambient temperature exceeded 35℃, the extreme temperature in the contact area of ​​some mill gear pairs could reach 80℃, far exceeding the threshold of elastohydrodynamic lubrication (EHL) conditions. Sustained high temperatures not only prevent the formation of an effective lubricating oil film (thickness <0.1μm), but also cause thermal deformation of the bearings (Δ=α·D·ΔT), thereby affecting transmission accuracy and system stability.

[0007] (2) High lubricant consumption

[0008] Traditional solutions rely on dynamically adjusting lubrication parameters, but these solutions suffer from high maintenance costs and limited effectiveness. Summary of the Invention

[0009] The purpose of this invention is to provide a high-performance, long-life open gear lubricant composition, its preparation method, and its application. The open gear lubricant composition of this invention has excellent cooling effect and energy-saving potential.

[0010] This invention provides a high-performance, long-life open gear lubricant composition comprising the following components by mass fraction:

[0011] Polyether synthetic oil: 81~96.3%,

[0012] Ester-based synthetic oils: 2~7.5%,

[0013] Extreme pressure anti-wear agent: 0.1~5%,

[0014] Ionic liquid anti-wear agent: 0.03~3.0%,

[0015] Metal passivating agent: 0.01~0.5%,

[0016] Rust inhibitor: 0.3~3.0%,

[0017] The polyether base oil has a kinematic viscosity of 2000~70000 mm at 40°C. 2 / s,

[0018] The synthetic ester base oil is one or more of the following: trimethylolpropane fatty acid ester, pentaerythritol fatty acid ester, dipentaerythritol fatty acid ester, neopentyl glycol fatty acid ester, sebacic acid fatty alcohol ester, azelaic acid fatty alcohol ester, polyethylene glycol fatty acid ester, adipic acid fatty alcohol ester, dimer oleic acid fatty alcohol ester, decanoic acid fatty alcohol ester, oleic acid fatty alcohol ester, stearic acid fatty alcohol ester, phthalic acid fatty alcohol ester, terephthalic acid fatty alcohol ester, polymethyl methacrylate, trimethylolpropane complex ester, pentaerythritol complex ester, hexanediol complex ester, and glycerol fatty ester.

[0019] Preferably, the extreme pressure anti-wear agent includes metal-free sulfur-containing substances and metal-free phosphorus-containing anti-wear additives.

[0020] Preferably, the metal-free sulfur-containing substances include one or more of the following: sulfurized olefins, dialkyl polysulfides, diaryl polysulfides, sulfurized oils, sulfurized fatty acid esters, trithiophosphorus, sulfurized oligomers of C2-C8 monoolefins, thiophosphate compounds, sulfurized terpenes, thiocarbamate compounds, thiocarbonate compounds, sulfoxides, and thiol sulfinates.

[0021] The metal-free phosphorus-containing anti-wear additives include one or more of the following: phosphate esters, thiophosphate esters, phosphites, thiophosphites, phosphonates, thiophosphonates, phosphoramide compounds, pyrophosphate esters, phosphoric acid, thiophosphoric acid; and amine or ammonium salts of the above-mentioned phosphate esters, thiophosphate esters, phosphites, thiophosphites, phosphonates, thiophosphonates, and pyrophosphate esters.

[0022] Preferably, the ionic liquid anti-wear agent is a 1-butyl-3-methylimidazolium salicylate ionic liquid.

[0023] Preferably, the metal passivating agent includes one or more of thiazole compounds, benzotriazole compounds, thiadiazole compounds, and imidazoline compounds.

[0024] Preferably, the rust inhibitor comprises one or more of fatty acids, alkenyl succinate half-ester, fatty acid soap, alkyl sulfonate, polyol fatty acid ester, fatty acid amine, oxidized paraffin, and alkyl polyoxyethylene ether.

[0025] Preferably, the high-performance, long-life open gear lubricant composition further includes an antioxidant;

[0026] The antioxidants include one or more of hindered phenolic antioxidants, aromatic amine antioxidants, thioester antioxidants, and phosphite antioxidants.

[0027] This invention provides a method for preparing the high-performance, long-life open gear lubricant composition as described above, comprising the following steps:

[0028] A) Heat the polyether synthetic oil under stirring, and add the remaining raw material components sequentially to 80~85℃;

[0029] B) After all raw materials have been added, raise the temperature to 90±2℃ and stir for 1.5~2.5 hours to obtain a high-performance, long-life open gear lubricant composition.

[0030] Preferably, the stirring speed in step A) is 50~100 rpm.

[0031] The stirring speed in step B) is 200~300 rpm.

[0032] This invention provides the application of the high-performance, long-life open gear lubricant composition described above in mining mills.

[0033] This invention provides a high-performance, long-life open gear lubricant composition comprising the following components by mass fraction: polyether synthetic oil: 81-96.3%, ester synthetic oil: 2-7.5%, extreme pressure anti-wear agent: 0.1-5%, ionic liquid anti-wear agent: 0.03-3.0%, metal passivator: 0.01-0.5%, rust inhibitor: 0.3-3.0%, wherein the polyether base oil has a kinematic viscosity of 2000-70000 mmHg at 40°C. 2 / s, wherein the synthetic ester base oil is one or more of the following: trimethylolpropane fatty acid ester, pentaerythritol fatty acid ester, dipentaerythritol fatty acid ester, neopentyl glycol fatty acid ester, sebacic acid fatty alcohol ester, azelaic acid fatty alcohol ester, polyethylene glycol fatty acid ester, adipic acid fatty alcohol ester, dimer oleic acid fatty alcohol ester, decanoic acid fatty alcohol ester, oleic acid fatty alcohol ester, stearic acid fatty alcohol ester, phthalic acid fatty alcohol ester, terephthalic acid fatty alcohol ester, polymethyl methacrylate, trimethylolpropane complex ester, pentaerythritol complex ester, hexanediol complex ester, and glycerol fatty ester. This invention achieves this through innovative formulation of the base oil system and revolutionary introduction of the anti-wear agent system, supplemented by precise additive balancing technology. For example, synthetic esters help ionic liquids and extreme pressure agents to be stably dispersed and function in polyethers; metal passivators ensure the compatibility of ionic liquids; and the overall high viscosity base oil ensures effective retention of additives. The final product is a high-performance open gear oil that excels in adhesion, extreme pressure anti-wear properties, thermal stability, corrosion resistance, and environmental friendliness. Its overall performance is significantly superior to existing all-oil synthetic open gear oil technologies. Detailed Implementation

[0034] This invention provides a high-performance, long-life open gear lubricant composition comprising the following components by mass fraction:

[0035] Polyether synthetic oil: 81~96.3%,

[0036] Ester-based synthetic oils: 2~7.5%,

[0037] Extreme pressure anti-wear agent: 0.1~5%,

[0038] Ionic liquid anti-wear agent: 0.03~3.0%,

[0039] Metal passivating agent: 0.01~0.5%,

[0040] Rust inhibitor: 0.3~3.0%, the polyether base oil has a viscosity grade of 2000~70000 mm. 2 / s,

[0041] The synthetic ester base oil is one or more of the following: trimethylolpropane fatty acid ester, pentaerythritol fatty acid ester, dipentaerythritol fatty acid ester, neopentyl glycol fatty acid ester, sebacic acid fatty alcohol ester, azelaic acid fatty alcohol ester, polyethylene glycol fatty acid ester, adipic acid fatty alcohol ester, dimer oleic acid fatty alcohol ester, decanoic acid fatty alcohol ester, oleic acid fatty alcohol ester, stearic acid fatty alcohol ester, phthalic acid fatty alcohol ester, terephthalic acid fatty alcohol ester, polymethyl methacrylate, trimethylolpropane complex ester, pentaerythritol complex ester, hexanediol complex ester, and glycerol fatty ester.

[0042] This invention employs a compound system of ultra-high viscosity polyether and a specific type of synthetic ester. In this invention, the viscosity grade of the polyether synthetic oil is preferably 2000~70000 mmHg. 2 The viscosity is 2500~39000, with a molecular weight of 2500~39000. This ultra-high viscosity is the basis for forming sufficient oil film strength under high load and low speed conditions of open gears, and is also the key difference from ordinary industrial gear oils. The mass fraction of the polyether synthetic oil is preferably 81~96.3%, more preferably 85~95%, such as 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 96.3%, preferably within the range of any of the above values ​​as the upper or lower limit.

[0043] In this invention, the ester-based synthetic oil must use one or more of the following: trimethylolpropane fatty acid ester, pentaerythritol fatty acid ester, dipentaerythritol fatty acid ester, neopentyl glycol fatty acid ester, sebacic acid fatty alcohol ester, azelaic acid fatty alcohol ester, polyethylene glycol fatty acid ester, adipic acid fatty alcohol ester, dimer oleic acid fatty alcohol ester, decanoic acid fatty alcohol ester, oleic acid fatty alcohol ester, stearic acid fatty alcohol ester, phthalic acid fatty alcohol ester, terephthalic acid fatty alcohol ester, polymethyl methacrylate, trimethylolpropane complex ester, pentaerythritol complex ester, hexanediol complex ester, and glycerol fatty ester. Its key function is not only to supplement lubrication, but more importantly, to act as a "coupling agent" and "solvent." Its content must be strictly controlled within a low range of 2% to 7.5%. This ratio ensures that it fully plays its role in dissolving additives and improving the sensitivity of polyethers to additives, while avoiding problems such as decreased viscosity-temperature properties and poor compatibility with polyethers due to excessive addition. The mass fraction of the ester synthetic oil is preferably 2 to 7.5%, more preferably 2 to 5%, such as 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, and preferably a range of values ​​with any of the above values ​​as the upper or lower limit.

[0044] This invention creates a novel, multi-mechanism synergistic lubrication and protective layer by synergistically compounding ionic liquids with traditional extreme pressure anti-wear agents.

[0045] In this invention, the extreme pressure anti-wear agent preferably comprises metal-free sulfur-containing substances and metal-free phosphorus-containing anti-wear additives. The metal-free sulfur-containing substances include one or more of the following: sulfurized olefins, dialkyl polysulfides, diaryl polysulfides, sulfurized oils, sulfurized fatty acid esters, trisulfide phosphorus, sulfurized oligomers of C2-C8 monoolefins, thiophosphate compounds, sulfurized terpenes, thiocarbamate compounds, thiocarbonate compounds, sulfoxides, and thiol sulfinates. The metal-free phosphorus-containing anti-wear additives include one or more of the following: ① Phosphate esters (such as neutral phosphate esters, acidic phosphate esters), thiophosphate esters, phosphites, thiophosphites, phosphonates, thiophosphonates, phosphoramide compounds (such as phosphoramide esters), pyrophosphate esters, phosphoric acid, thiophosphoric acid; ② amine salts (such as fatty amine salts, cycloalkyl amine salts) of phosphate esters, thiophosphate esters, phosphites, thiophosphites, phosphonates, thiophosphonates, and pyrophosphate esters mentioned in ① above; ③ ammonium salts of phosphate esters, thiophosphate esters, phosphites, thiophosphites, phosphonates, thiophosphonates, and pyrophosphate esters mentioned in ① above. Specifically, in some embodiments of the present invention, the extreme pressure anti-wear agent is preferably an acidic phosphate (R1O(R2O)P(O)OH), wherein R1 is hydrogen or a C1-C24 hydrocarbon group, and R2 is a C1-C24 hydrocarbon group. Preferably, R1 and R2 are each independently a C3-C18 hydrocarbon group; more preferably, R1 and R2 are each independently a C4-C12 hydrocarbon group. The mass fraction of the extreme pressure anti-wear agent is preferably 0.1-5%, more preferably 0.5-4%, such as 0.1%, 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, preferably a range of values ​​with any of the above values ​​as the upper or lower limit.

[0046] In this invention, the ionic liquid anti-wear agent is preferably a 1-butyl-3-methylimidazolium salicylate ionic liquid, and is preferably prepared according to the following steps:

[0047] Salicylic acid and sodium bicarbonate were mixed in ethanol and stirred until homogeneous to obtain a mixed solution. Then, the precursor ionic liquid 1-butyl-3-methylimidazolium chloride was added to the mixed solution and stirred to carry out the reaction. After the reaction was completed, the solution was filtered and washed to obtain 1-butyl-3-methylimidazolium salicylate ionic liquid.

[0048] In this invention, the salicylic acid and sodium bicarbonate are dissolved in ethanol respectively, and then the resulting sodium bicarbonate ethanol solution is slowly added to the salicylic acid ethanol solution and magnetically stirred to obtain a mixed solution.

[0049] In this invention, the mass ratio of salicylic acid to sodium bicarbonate is preferably 1:(1.5~1.8), more preferably 1:(1.6~1.7). The mixing temperature is preferably room temperature, such as 20~30°C, and the stirring time is preferably 5~6 hours.

[0050] After obtaining the mixed solution, the present invention mixes the precursor ionic liquid 1-butyl-3-methylimidazolium chloride with ethanol, and then adds it to the above mixed solution. The mixture is magnetically stirred at room temperature to carry out the reaction. After the reaction is completed, white solid sodium chloride precipitates in the system. After filtration, washing and drying, 1-butyl-3-methylimidazolium salicylate ionic liquid is obtained.

[0051] In this invention, the preferred mass ratio of the precursor ionic liquid 1-butyl-3-methylimidazolium chloride ethanol solution and the salicylic acid and sodium bicarbonate mixture is 1:(0.7~0.85), more preferably 1:(0.75~0.79), and the preferred magnetic stirring time is 20~24 hours.

[0052] In this invention, the mass ratio of salicylic acid to sodium bicarbonate is preferably 1:(1.5~1.8), more preferably 1:(1.6~1.7 (with this mass ratio, the molar ratio of the two is approximately 1:(2.3~3.0), and excess sodium bicarbonate ensures that salicylic acid is completely converted to sodium salicylate). The mixing temperature is preferably room temperature, such as 20~30°C, and the stirring time is preferably 5~6 hours.

[0053] In this invention, the mass ratio of 1-butyl-3-methylimidazolium chloride to salicylic acid is preferably 1:(0.65~0.75), more preferably 1:(0.7~0.75).

[0054] In this invention, the mass fraction of the ionic liquid anti-wear agent is preferably 0.03~3.0%, more preferably 0.05~2.5%, such as 0.03%, 0.05%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.5%, 2%, 2.5%, 3%, preferably a range of values ​​with any of the above values ​​as the upper or lower limit.

[0055] This invention adds 0.03% to 3.0% (preferably 0.2%-1.5%) of an ionic liquid anti-wear agent. The ionic liquid can form a strongly adsorbed ionic boundary film on the metal surface, effectively reducing friction and fretting wear, especially under boundary lubrication conditions such as start-up and shutdown. The extreme pressure anti-wear agent (0.1~5%) provides a chemical reaction protective film under high temperature and high load, while the ionic liquid provides a physical adsorption film and electrochemical protection. The two work synergistically to achieve comprehensive protection across all operating conditions, from extreme pressure to wear resistance, and from macroscopic to microscopic levels. This protection is achieved within a specific compounding ratio range.

[0056] This invention addresses the characteristics of open gears being exposed to air and susceptible to moisture damage by designing a functional additive system with metal passivators and rust inhibitors as the core, and using precise dosages.

[0057] In this invention, the metal passivating agent is preferably one or more selected from thiazole compounds, benzotriazole compounds, thiadiazole compounds, and imidazoline compounds. The thiadiazole compounds are preferably 2-mercapto-1,3,4-thiadiazole, 2-mercapto-5-alkylthio-1,3,4-thiadiazole, 2-mercapto-5-alkylthio-1,3,4-thiadiazole, 2,5-bis-(alkylthio)-1,3,4-thiadiazole, and 2,5-bis-(alkylthio)-1,3,4-thiadiazole. The benzotriazole compound is one or more of 4-thiadiazoles, preferably benzotriazole and / or C1-C6 alkyl-substituted 1,2,3-benzotriazoles, more preferably C1-C4 alkyl-substituted 1,2,3-benzotriazoles, such as tolyltriazole. The mass fraction of the metal passivating agent is preferably 0.01-0.5%, more preferably 0.03-0.1%, such as 0.01%, 0.03%, 0.05%, 0.08%, 0.1%, 0.15%, 0.2%, 0.25%, 0.3%, 0.35%, 0.4%, 0.45%, 0.5%, preferably within the range of any of the above values ​​as the upper or lower limit, and the content is controlled between 0.01% and 0.5% (preferably 0.03%-0.1%). This component can effectively inhibit the corrosion of non-ferrous metals such as copper and silver by ionic liquids or other active components, and is a key technical guarantee for ensuring the safe use of ionic liquids.

[0058] In this invention, the rust inhibitor preferably includes one or more of fatty acids, alkenyl succinate half-ester, fatty acid soap, alkyl sulfonate, polyol fatty acid ester, fatty acid amine, oxidized paraffin, and alkyl polyoxyethylene ether. The mass fraction of the rust inhibitor is preferably 0.3-3.0%, more preferably 0.5-1.0%, such as 0.3%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.5%, 2%, 2.5%, 3%, preferably within the range of any of the above values ​​as the upper or lower limit. The rust inhibitor can effectively protect gears from rust in humid environments, solving the pain point problem of open gears.

[0059] Preferably, the high-performance, long-life open gear lubricant composition of the present invention may selectively include antioxidants to further extend service life. The antioxidants preferably include one or more of hindered phenolic antioxidants, aromatic amine antioxidants, thioester antioxidants, and phosphite antioxidants; the mass fraction of the antioxidant is preferably 0.1-0.5%, more preferably 0.2-0.4%, such as 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, and preferably a range of values ​​with any of the above values ​​as the upper or lower limit.

[0060] This invention also provides a method for preparing the high-performance, long-life open gear lubricant composition described above, comprising the following steps:

[0061] A) Heat the polyether synthetic oil under stirring, and add the remaining raw material components sequentially to 80~85℃;

[0062] B) After all raw materials have been added, raise the temperature to 90±2℃ and stir for 1.5~2.5 hours to obtain a high-performance, long-life open gear lubricant composition.

[0063] This invention involves adding all weighed polyether synthetic oil into a blending vessel, starting stirring at 50-100 rpm, and initiating heating to uniformly raise the temperature of the base oil. Heating is continued while monitoring the oil temperature. Before the oil temperature reaches 80-85°C (strictly controlled below the additive decomposition temperature), the remaining components are added sequentially. After each component is added, stirring is maintained for at least 10-15 minutes to ensure complete dissolution and uniform dispersion before adding the next component. After all components have been added, the oil temperature is raised and maintained at 90±2°C, and the stirring speed is increased to 200-300 rpm. Stirring is continued at this temperature and speed for 1.5-2.5 hours. This is crucial to ensuring that all additive components are completely dissolved, uniformly dispersed, and form a homogeneous and stable system with the base oil. Sufficient temperature and time help overcome the dispersion difficulties caused by the high viscosity of ionic liquids and ensure that solid or high-viscosity components such as extreme pressure anti-wear agents do not precipitate or settle.

[0064] This invention also provides an application of the high-performance, long-life open gear lubricant composition described above in mining mills. Compared with the all-oil type open gear oil used in the prior art, the open gear oil composition provided by this invention has the following significant advantages and positive effects:

[0065] 1. Excellent adhesion and anti-drip properties:

[0066] The ultra-high viscosity polyether base oil (2000~70000 mm² / s) selected in this invention has excellent adhesion and film-forming ability, enabling it to firmly adhere to the gear surface and effectively resist splashing and runoff caused by centrifugal force, gravity, or wind and rain. Compared with base oils such as PAO or mineral oil, it has superior adhesion performance at the same apparent viscosity, thereby reducing lubricant consumption and extending the re-lubrication cycle.

[0067] 2. Excellent extreme pressure anti-wear properties and synergistic effect:

[0068] This invention innovatively introduces ionic liquid as an anti-wear agent, forming a synergistic lubrication and protection system with traditional sulfur-phosphorus type extreme pressure anti-wear agents.

[0069] Traditional techniques typically rely on extreme pressure agents decomposing under high temperature and high load to react with the metal surface and form a chemical reaction film to prevent adhesion. However, this film has high shear strength and limited effectiveness in reducing friction and fine wear.

[0070] This invention utilizes ionic liquids to form a robust, easily shearable adsorption film on metal surfaces, effectively reducing the coefficient of friction and preventing boundary lubrication wear (such as fretting wear) during startup and shutdown. When combined with extreme pressure agents, it achieves a perfect combination of "extreme pressure protection" and "anti-wear and friction reduction," providing full-cycle, multi-mechanism protection from startup, operation to shutdown. This advantage is not found in traditional formulations.

[0071] 3. Excellent additive compatibility and solubility:

[0072] In the prior art, many high-performance polar additives (including the ionic liquid used in this invention) have poor solubility in non-polar PAO or mineral oil, which easily leads to precipitation, layering, or stability problems, affecting their effectiveness. This invention specifically adds 2-7.5% of a particular synthetic ester, one of its key functions being as a "solvent".

[0073] The polyether used in this invention has a certain degree of polarity, and when combined with synthetic esters that are both oil-soluble and polar, they together form an excellent "solvent platform". This ensures that all additives, such as ionic liquids and extreme pressure agents, can be stably and uniformly dissolved in the system, fully exert their effects, and guarantee the long-term storage stability of the product.

[0074] 4. Enhanced thermal oxidation stability and cleanliness:

[0075] The base oil system (polyether + synthetic ester) of this invention has inherently high thermal oxidation stability.

[0076] Polyether molecules do not contain easily oxidized C-C bonds, and their decomposition products are mainly volatile low-molecular-weight compounds, unlike mineral oil or PAO which produce hard-to-remove carbon deposits and gums.

[0077] This feature enables the product of this invention to keep the gear surface clean under high-temperature conditions (such as cement kilns, ball mills, etc.), avoiding sludge and paint film from clogging the spray system or affecting heat dissipation, and greatly extending the equipment cleaning and maintenance cycle.

[0078] 5. Excellent corrosion resistance and metal passivation capabilities:

[0079] This invention successfully solves the corrosion risk that ionic liquids may pose to non-ferrous metals (such as copper alloy bearing cages) by precisely matching the metal passivating agent (0.01-0.5%) with the formulation system.

[0080] This design allows the invention to fully benefit from the friction-reducing and wear-resistant properties of ionic liquids while completely avoiding their potential side effects, ensuring the safety of all metal materials in the equipment. This is something that cannot be achieved by simply introducing ionic liquids without corresponding compatibility design.

[0081] 6. Environmental and safety advantages:

[0082] Compared with asphalt-based products (containing carcinogenic volatile solvents) and graphite-based products (graphite particles may pollute the environment and are conductive), which have been banned in Europe and the United States, this invention is a fully synthetic, all-oil lubricant without solid particles. It does not contain volatile organic solvents (VOCs), is non-toxic and harmless, and is friendly to the environment and operators, which is in line with the environmental protection and development trend of modern industry.

[0083] To further illustrate the present invention, the following detailed description of a high-performance, long-life open gear lubricant composition, its preparation method, and its application, in conjunction with embodiments, is provided by the present invention, but should not be construed as limiting the scope of protection of the present invention.

[0084] Examples 1-3

[0085] Weigh each component according to the formula in Table 1. Add the polyether synthetic oil to the mixing vessel, start stirring and heating. When the temperature reaches 85℃, add the ester synthetic oil, metal passivator, rust inhibitor, extreme pressure anti-wear agent, and ionic liquid anti-wear agent in sequence. Stir for 15 minutes after each additive is added to ensure full dispersion. After all additives are added, raise the oil temperature to 90℃, accelerate stirring to 250 rpm, and maintain the temperature for 2 hours. Then stop heating, start circulating filtration (20μm), cool to below 40℃, and discharge.

[0086] Table 1 Formulations in Examples 1-3

[0087]

[0088] Comparative Examples 1-4

[0089] A lubricant composition was prepared according to the method in Example 1, except that the components were weighed according to the formula in Table 2.

[0090] Table 2 Formulations for Comparative Examples 1-4

[0091]

[0092] The performance of the lubricants prepared in the examples and comparative examples was tested, and the results are shown in Table 3.

[0093] Table 3 Performance parameters of the lubricant compositions in the examples and comparative examples

[0094]

[0095] As can be seen from Table 1, the lubricant composition in the embodiments of this application has better wear resistance and corrosion resistance, and stronger anti-sintering and anti-scraping properties under extreme high pressure conditions.

[0096] The lubricant obtained in Example 3 of this invention was used in a semi-autogenous ball mill, and the results are shown in Table 4.

[0097] Table 4. Application effect of lubricant in Example 3

[0098]

[0099] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A high-performance, long-life open gear lubricant composition, comprising the following components by mass fraction: Polyether synthetic oil: 81~96.3%, Ester-based synthetic oils: 2~7.5%, Extreme pressure anti-wear agent: 0.1~5%, Ionic liquid anti-wear agent: 0.03~3.0%, Metal passivating agent: 0.01~0.5%, Rust inhibitor: 0.3~3.0%, The polyether base oil has a kinematic viscosity of 2000~70000 mm at 40°C. 2 / s, The synthetic ester base oil is one or more of the following: trimethylolpropane fatty acid ester, pentaerythritol fatty acid ester, dipentaerythritol fatty acid ester, neopentyl glycol fatty acid ester, sebacic acid fatty alcohol ester, azelaic acid fatty alcohol ester, polyethylene glycol fatty acid ester, adipic acid fatty alcohol ester, dimer oleic acid fatty alcohol ester, decanoic acid fatty alcohol ester, oleic acid fatty alcohol ester, stearic acid fatty alcohol ester, phthalic acid fatty alcohol ester, terephthalic acid fatty alcohol ester, polymethyl methacrylate, trimethylolpropane complex ester, pentaerythritol complex ester, hexanediol complex ester, and glycerol fatty ester.

2. The high-performance, long-life open gear lubricant composition according to claim 1, characterized in that, The extreme pressure anti-wear agent includes metal-free sulfur-containing substances and metal-free phosphorus-containing anti-wear additives.

3. The high-performance, long-life open gear lubricant composition according to claim 2, characterized in that, The metal-free sulfur-containing substances include one or more of the following: sulfurized olefins, dialkyl polysulfides, diaryl polysulfides, sulfurized oils, sulfurized fatty acid esters, trithiophosphorus, sulfurized oligomers of C2-C8 monoolefins, thiophosphate compounds, sulfurized terpenes, thiocarbamate compounds, thiocarbonate compounds, sulfoxides, and thiol sulfinates. The metal-free phosphorus-containing anti-wear additives include one or more of the following: phosphate esters, thiophosphate esters, phosphites, thiophosphites, phosphonates, thiophosphonates, phosphoramide compounds, pyrophosphate esters, phosphoric acid, thiophosphoric acid; and amine or ammonium salts of the above-mentioned phosphate esters, thiophosphate esters, phosphites, thiophosphites, phosphonates, thiophosphonates, and pyrophosphate esters.

4. The high-performance, long-life open gear lubricant composition according to claim 1, characterized in that, The ionic liquid anti-wear agent is a 1-butyl-3-methylimidazolium salicylate ionic liquid.

5. The high-performance, long-life open gear lubricant composition according to claim 1, characterized in that, The metal passivating agent includes one or more of thiazole compounds, benzotriazole compounds, thiadiazole compounds, and imidazoline compounds.

6. The high-performance, long-life open gear lubricant composition according to claim 1, characterized in that, The rust inhibitor includes one or more of fatty acids, alkenyl succinate half-ester, fatty acid soap, alkyl sulfonate, polyol fatty acid ester, fatty acid amine, oxidized paraffin, and alkyl polyoxyethylene ether.

7. The high-performance, long-life open gear lubricant composition according to claim 1, characterized in that, The high-performance, long-life open gear lubricant composition also includes an antioxidant; The antioxidants include one or more of hindered phenolic antioxidants, aromatic amine antioxidants, thioester antioxidants, and phosphite antioxidants.

8. The method for preparing the high-performance, long-life open gear lubricant composition as described in claim 1, comprising the following steps: A) Heat the polyether synthetic oil under stirring, and add the remaining raw material components sequentially to 80~85℃; B) After all raw materials have been added, raise the temperature to 90±2℃ and stir for 1.5~2.5 hours to obtain a high-performance, long-life open gear lubricant composition.

9. The preparation method according to claim 8, characterized in that, In step A), the stirring speed is 50~100 rpm. The stirring speed in step B) is 200~300 rpm.

10. The application of the high-performance, long-life open gear lubricant composition as described in any one of claims 1 to 7 in mining mills.

Images