Lubricating oil composition special for aluminum bronze turbine worm and preparation method of lubricating oil composition

Abstract

The invention relates to the field of lubricating grease, and particularly discloses a special lubricating oil composition for an aluminum bronze turbine worm and a preparation method of the special lubricating oil composition. The special lubricating oil composition is prepared from the following raw materials in parts by weight: 30 to 40 parts of trimethylolpropane ester, 21.4 to 47.19 parts of refined mineral oil, 20 to 30 parts of tackifier, 1 to 2.5 parts of extreme pressure anti-wear agent, 1 to 2.5 parts of oiliness agent, 0.3 to 1.2 parts of oil-soluble molybdenum salt, 0.3 to 1.5 parts of antioxidant, 0.2 to 0.8 part of corrosion inhibitor and 0.01 to 0.1 part of defoaming agent. The lubricating oil disclosed by the invention has the advantages of high applicability to a turbine and a worm, good lubricity, extreme pressure property, water separation property and oxidation resistance and capability of effectively reducing abrasion of the turbine and the worm.

Description

Technical Field

[0001] This application relates to the field of lubricating grease technology, and more specifically, to a special lubricating oil composition for aluminum bronze turbine worm gears and its preparation method. Background Technology

[0002] Worm gear drives, especially those using aluminum bronze as the turbine material, are widely used in heavy machinery in industries such as metallurgy, mining, hoisting, and chemical engineering due to their advantages of compact structure, smooth transmission, and ability to achieve large transmission ratios. However, these traditional devices are usually accompanied by high load, high impact, and low-speed heavy load conditions during operation, and the intense sliding friction between the meshing tooth surfaces can cause the working temperature to rise sharply, with local temperature rises exceeding 100°C. Under such harsh working conditions, traditional lubrication methods—that is, the use of lubricating oil—expose many insurmountable defects: (1) The lubricating oil has poor anti-leakage properties, leading to environmental pollution and resource waste. In a continuous high-temperature working environment, the viscosity of the lubricating oil will decrease significantly, its fluidity will increase, and it will be very easy to leak from the sealing gaps of the equipment. This not only seriously pollutes the equipment and the surrounding environment, causing a waste of lubricant, but more importantly, it prevents the turbine, worm gear, and support shaft from receiving effective lubrication and protection due to lack of oil. This leads to increased wear of the meshing pairs, resulting in decreased transmission accuracy, increased vibration and noise, and ultimately premature failure of the turbine, worm gear, and bearings, greatly shortening the service life of the equipment and increasing maintenance costs. (2) Short service life and high overall cost. At high temperatures, the oxidation rate of lubricating oil accelerates, and the oil is prone to aging. Especially in certain working conditions where there is water vapor or may come into contact with cooling water, the high-temperature lubricating oil will quickly emulsify, deteriorate, and corrode after rain, losing its basic lubricating properties. In order to ensure the normal operation of the equipment, it is necessary to frequently stop the machine to replace the oil. This not only increases the consumption cost of the lubricant itself, but also leads to the loss of production efficiency and the increase in labor maintenance costs.

[0003] In view of the aforementioned technologies, the inventors believe that developing a specialized lubricating product that can overcome the above-mentioned shortcomings and possesses excellent high-temperature stability and anti-leakage properties has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0004] In order to improve the high-temperature lubricity, anti-leakage, water resistance and long-life lubricity of lubricating products, this application provides a special lubricating oil composition for aluminum bronze turbine worm gears and its preparation method.

[0005] In a first aspect, this application provides a special lubricating oil composition for aluminum bronze turbine worm gears, employing the following technical solution: A special lubricating oil composition for aluminum bronze turbine worm gears comprises the following raw materials in parts by weight: 30-40 parts of trimethylolpropane ester, 21.4-47.19 parts of refined mineral oil, 20-30 parts of thickener, 1-2.5 parts of extreme pressure anti-wear agent, 1-2.5 parts of oiliness agent, 0.3-1.2 parts of oil-soluble molybdenum salt, 0.3-1.5 parts of antioxidant, 0.2-0.8 parts of corrosion inhibitor, and 0.01-0.1 parts of defoamer.

[0006] By adopting the above technical solution, a base oil system is composed of trimethylolpropane ester and refined mineral oil PEI. Trimethylolpropane ester is a synthetic ester base oil with excellent thermal stability and a high viscosity index. At high temperatures, its viscosity decreases only slightly, better maintaining oil film strength and preventing high-temperature viscosity drop and leakage. Refined mineral oil serves as an auxiliary base oil to adjust the overall viscosity of the lubricating oil, giving it better high-temperature viscosity retention. The viscosity modifier imparts extremely high adhesion and sealing properties to the lubricating oil composition, making it less prone to leakage through sealing gaps and avoiding pollution, waste, and other problems caused by leakage. Lubrication failure prevention ensures that the worm gear meshing surface, subjected to high temperatures and high shear forces, is not blown off or thrown away, thus providing long-lasting lubrication protection and extending the service life of the lubricating oil composition; antioxidants effectively slow down the oxidation rate of base oil and additives at high temperatures, significantly extending the service life of the grease, making the lubricating oil less prone to oxidation and deterioration at high temperatures, and reducing the frequency of replacement; corrosion inhibitors prevent acidic substances in the lubricant or external moisture from corroding the sensitive aluminum bronze worm gear, protecting the metal surface; defoamers prevent foaming under violent agitation in the gearbox, which can affect lubrication and even lead to leakage.

[0007] Extreme pressure anti-wear agents form a high-strength protective film when the turbine worm gear is subjected to extremely high pressure, preventing severe wear such as scuffing on the tooth surface. Oily agents complement the functions of extreme pressure anti-wear agents, forming a strong lubricating film on the metal surface through physical or chemical adsorption, reducing the coefficient of friction and wear. Oil-soluble molybdenum salts are friction modifiers with certain antioxidant and extreme pressure properties. They can form a molybdenum disulfide layer on the metal surface, with a low coefficient of friction, effectively reducing wear and heat accumulation caused by sliding friction.

[0008] Therefore, the resulting lubricating oil composition exhibits excellent high-temperature stability. The high content of thickeners allows it to adhere firmly to the friction pair, preventing leakage. Furthermore, its antioxidant and demulsification properties are enhanced, extending oil change intervals and reducing operating costs. In addition, through the synergistic effect of extreme pressure anti-wear agents, oiliness agents, and oil-soluble molybdenum salts, it provides comprehensive protection for the aluminum bronze-friction pair, significantly reducing wear and extending the service life of the equipment.

[0009] Optionally, the extreme pressure anti-wear agent is selected from at least one of triphenyl thiophosphate, ammonium phosphate salt, and ammonium thiophosphate salt; The oiliness agent is selected from at least one of dimer acid, ethylene glycol oleate, and benzotriazole amine salt; The oil-soluble molybdenum salt is selected from at least one of dialkyl dithiophosphate molybdenum oxydicarboxylate and dialkyl dithiocarbamate molybdenum.

[0010] By adopting the above technical solution, triphenyl thiophosphate, under high temperature and pressure, allows sulfur to react on the friction surface to form a high-strength protective film, while phosphorus helps repair the worn surface, forming a low-shear-strength iron-phosphorus compound film. This provides effective protection while keeping the risk of copper corrosion controllable. The dimer acid in the oiliness agent is a long-chain carboxylic acid type oiliness agent. Its long molecular chain allows it to form a strong, dense, and well-oriented physical adsorption film on the metal surface, significantly reducing the coefficient of friction, especially in mixed lubrication zones, where it also has rust-preventive capabilities. Ethylene glycol oleate has excellent compatibility with the base oil, and can not only pass through the adsorption film... It provides friction reduction; its ester molecules themselves have excellent lubricity, effectively improving the lubrication effect of lubricating oil. Benzotriazole amine salt is a non-ferrous metal corrosion inhibitor that can form an insoluble polymeric complex protective film on the copper surface, preventing discoloration and corrosion, while also inhibiting the catalytic effect of metal ions on oil oxidation. Dialkyl dithiophosphate molybdenum combines antioxidant, anti-wear, and friction-reducing effects. It can decompose on the friction surface to form molybdenum disulfide, providing excellent friction reduction, while also providing excellent antioxidant and anti-wear protection. Dialkyl dithiocarbamate molybdenum also has excellent antioxidant and friction-reducing effects, which can significantly extend the service life of oil.

[0011] Optionally, the mass ratio of the triphenyl thiophosphate, dimer acid, and dialkyl dithiophosphate molybdenum oxide is 1.5:1.5:0.5.

[0012] By adopting the above technical solution, triphenyl thiophosphate can undergo a decomposition reaction under high temperature and high pressure to form a protective film of visible sulfides and phosphides, preventing direct contact and welding of metal surfaces, and significantly improving the maximum non-seize load of the lubricating oil. Dialkyl dithiophosphate molybdenum works together with it to construct a multi-layered, high-strength protective layer on the metal surface, ensuring extreme pressure performance. Dialkyl dithiophosphate molybdenum works in conjunction with dimer acid, and the adsorption film of dimer acid can complement the molybdenum disulfide film formed by dialkyl dithiophosphate molybdenum. Dimer acid works at lower temperatures and medium to low loads, while the MoS2 film is more stable at high temperatures and high loads. The combination of the two ensures that the lubricating oil can maintain an extremely low coefficient of friction and wear rate throughout the entire process from start-up, normal operation to high load, which is manifested as a significant reduction in the diameter of wear scars.

[0013] Optionally, the lubricating oil composition may further contain a solid lubricant, wherein the mass ratio of the solid lubricant to the extreme pressure anti-wear agent is 1-1.5:1.5, and the solid lubricant is a g-C3N4 / sodium disilicate composite material.

[0014] By adopting the above technical solution, g-C3N4 is a layered material with weak interlayer bonding and inherent friction-reducing effect. Sodium disilicate provides excellent anti-wear and extreme pressure properties. Using g-C3N4 as a base, sodium disilicate is firmly and uniformly attached to the surface of g-C3N4 sheets or intercalated into the interlayers in the form of nanoparticles to form a stable composite. The layered structure of g-C3N4 is prone to interlayer sliding under shear force, providing a low coefficient of friction. Sodium disilicate, as a reinforcing particle, can undergo tribochemical reaction on the friction surface under high temperature and high pressure to generate a hard silicate protective film to prevent wear. At the same time, its nanoparticles roll between the friction pairs, which also plays an anti-wear role. Therefore, the sliding effect of g-C3N4 sheets and the ball-bearing effect of sodium disilicate work together to build a strong and easy-to-slide protective film on the friction surface, thereby significantly improving the anti-wear and friction-reducing performance of lubricating oil, especially under high temperature and heavy load conditions.

[0015] In addition, g-C3N4 has a large specific surface area and abundant nitrogen-containing functional groups, which can adsorb and lock in a small amount of free water that has entered the oil, reducing the movement and aggregation of free water, thereby slowing down the emulsification process of the oil and helping to maintain the clarity of the lubricating oil. Moreover, the g-C3N4 / sodium disilicate composite material can form a strong and dense protective film on the surface of the friction pair, physically isolating water from direct contact with the metal surface, thus providing rust and corrosion protection. This allows the lubricating oil to better maintain its lubricating performance in humid environments or in the event of accidental water ingress, and to more effectively protect the metal parts of the equipment from rust.

[0016] Optionally, the preparation method of the g-C3N4 / sodium disilicate composite material is as follows: Add g-C3N4 to deionized water and sonicate for 30-40 minutes to obtain a suspension. Add water glass and sodium hydroxide to deionized water and stir evenly to obtain a reaction solution. Under stirring, the suspension is added dropwise to the reaction solution at a rate of 1-2 drops / second. The mixture is stirred at room temperature for 2-4 hours, sealed and aged for 6-12 hours, centrifuged, washed until the pH of the supernatant reaches 9-10, filtered, and freeze-dried. The freeze-dried product is then heat-treated at 350-450℃ for 1-2 hours under an inert atmosphere at a rate of 2-5℃ / min to obtain g-C3N4-supported sodium disilicate. The g-C3N4-supported sodium disilicate is dispersed in anhydrous ethanol, oleic acid is added, and the mixture is stirred at 80-90℃ for 3-5 hours. After centrifugation, washing, and drying, the g-C3N4 / sodium disilicate composite material is obtained.

[0017] By employing the above technical solution, g-C3N4 is ultrasonically treated with deionized water to overcome its interlayer van der Waals forces, forming a uniform and stable suspension. This suspension is then mixed with a reaction solution, allowing sodium hydroxide and water glass to nucleate and grow on the g-C3N4 surface. After aging and precipitation, the material is freeze-dried to maximize the preservation of its porous structure and prevent particle agglomeration. Finally, heat treatment under an inert gas atmosphere removes residual bound water and hydroxyl groups, promoting the transformation of sodium disilicate from an amorphous to a crystalline state, thus improving its structural stability and further... To enhance the bonding force between g-C3N4 and sodium disilicate, sodium disilicate is attached to g-C3N4. Using g-C3N4 as the substrate and sodium disilicate as the functional component, loading prevents sodium disilicate agglomeration. The layered structure of g-C3N4 is used to achieve a smoother lubrication effect. Finally, oleic acid is used to hydrophobically treat the sodium disilicate-loaded g-C3N4 to improve the dispersibility of the disilicate-loaded g-C3N4 in the lubricating oil, thereby preferentially adsorbing it onto the surface of the metal friction pair and participating in the tribochemical reaction, thus greatly improving the anti-wear performance.

[0018] Optionally, the g-C3N4 / sodium disilicate composite material also contains zinc sulfide.

[0019] By adopting the above technical solution, zinc sulfide is a solid lubricant with a low coefficient of friction. It can form a thin film on the friction surface, providing friction reduction and anti-wear effects, so that the composite material has a lower coefficient of friction, higher load-bearing capacity and wear resistance.

[0020] Optionally, the g-C3N4 / sodium disilicate composite material containing zinc sulfide is prepared by the following method: Add g-C3N4 to deionized water and sonicate for 30-40 minutes to obtain a suspension. Add water glass and sodium hydroxide to deionized water and stir evenly to obtain a reaction solution. Under stirring, the suspension is added dropwise to the reaction solution at a rate of 1-2 drops / second. The mixture is stirred at room temperature for 2-4 hours, sealed and aged for 6-12 hours, centrifuged, washed until the pH of the supernatant reaches 9-10, filtered, and freeze-dried. The freeze-dried product is mixed with zinc stearate and sulfur powder, and heated to 350-450℃ at a rate of 2-5℃ / min under an inert atmosphere for 1-2 hours to obtain g-C3N4 supported sodium disilicate. The g-C3N4-supported sodium disilicate was dispersed in anhydrous ethanol, oleic acid was added, and the mixture was stirred at 80-90℃ for 3-5 hours. After centrifugation, washing, and drying, the g-C3N4 / sodium disilicate composite material was obtained.

[0021] By adopting the above technical solution, under an inert atmosphere, zinc stearate decomposes to generate zinc oxide and stearic acid vapor, while sulfur powder generates sulfur vapor. Zinc oxide and sulfur vapor undergo a solid-phase reaction to generate zinc sulfide. The porous structure of the freeze-dried product provides a large contact area for zinc stearate and sulfur powder, facilitating the reaction. Zinc sulfide works synergistically with g-C3N4 and sodium disilicate, with g-C3N4 serving as the load-bearing framework and sliding component, providing a large specific surface area and a layered lubrication base. Sodium disilicate, as the extreme pressure component, firmly adheres to the framework in the form of nanoparticles or thin layers, providing high strength. Furthermore, under high temperature and pressure, it reacts with iron to form a hard protective layer, preventing wear. Meanwhile, zinc sulfide, as even finer particles, is uniformly distributed in the film and pores of the freeze-dried product, acting as... Solid lubricants and synergistic components provide direct lubrication and work synergistically with sodium disilicate. Under the localized high temperatures of friction, zinc sulfide reacts with silica and other materials to form glassy complexes such as zinc silicate, achieving a self-repairing effect. This makes the protective film denser and tougher, allowing the lubricating oil to maintain an intact lubricating film even under extremely high pressure, significantly reducing wear and surface fatigue. It is particularly suitable for low-speed, heavy-load transmissions such as worm gears, improving extreme pressure anti-wear properties. The layered structure of g-C3N4 and the low shear strength of ZnS work together to effectively reduce the coefficient of friction, reduce energy loss and equipment operating temperature, achieving a better friction reduction effect. Furthermore, the lubricating film is denser and can effectively isolate water from the metal surface, preventing electrochemical corrosion and modification, and improving the protection of equipment in humid environments.

[0022] In addition, although the stearic acid vapor produced by the decomposition of zinc stearate will be largely recovered, the residual trace amounts of long-chain hydrocarbons will be adsorbed on the surface of the composite, making its dispersion stability in the base oil better. Moreover, stearic acid itself has the effect of an oiliness agent, which can improve the lubrication effect under boundary lubrication conditions. Optionally, the raw materials of the g-C3N4 / sodium disilicate composite material include, by weight: 10 parts g-C3N4, 20 parts water glass, 10 parts sodium hydroxide, 1.5 parts zinc stearate, and 0.075 parts sulfur powder.

[0023] Optionally, the trimethylolpropane ester is prepared by esterification of C12-C18 saturated / unsaturated fatty acids with trimethylolpropane, and has a kinematic viscosity of 40-100 mmHg at 40°C. 2 / s, viscosity index ≥120.

[0024] By adopting the above technical solution, trimethylolpropane esters with the above kinematic viscosity and viscosity index can form a thick and tough lubricating oil film, which is firmly adsorbed onto the metal surface, better maintaining the oil film strength and load-bearing capacity, preventing wear, and providing excellent extreme pressure and anti-wear protection for equipment.

[0025] Optionally, the refined mineral oil is a deeply hydrotreated isomerized dewaxed base oil with a kinematic viscosity of 80-120 mmHg at 40°C.2 / s.

[0026] By adopting the above technical solution, the deep hydrotreated isomerized dewaxed base oil has excellent stability and good viscosity-temperature properties. When mixed with trimethylolpropane ester, it can provide a strong oil film and obtain excellent extreme pressure lubrication.

[0027] Optionally, the tackifier is selected from at least one of polyisobutylene and ethylene propylene rubber, and the kinematic viscosity of the tackifier at 100°C is 800-1500 mmHg. 2 / s.

[0028] By adopting the above technical solution, polyisobutylene can increase the viscosity of oil, giving the lubricating oil composition the advantages of high viscosity and strong adhesion. Moreover, the molecular structure of polyisobutylene has excellent adhesion, which can firmly adhere to the metal surface and is not easily squeezed or thrown off, making it suitable for applications where turbine worm gears require oil with extremely strong retention capacity.

[0029] Optionally, the mass ratio of trimethylolpropane ester, refined mineral oil, and polyisobutylene is 35:35.85:25.

[0030] By adopting the above technical solution, trimethylolpropane ester exhibits excellent viscosity-temperature characteristics. At high temperatures, its viscosity decreases minimally, maintaining good oil film strength. At low temperatures, its viscosity increases only slightly, resulting in a low pour point, good low-temperature fluidity, and significant friction-reducing and anti-wear effects. Furthermore, its high decomposition temperature enhances its resistance to subsequent degradation, extending the service life of the oil. Refined mineral oil possesses excellent lubricating properties and good compatibility with ester oils, preventing stratification or precipitation after mixing. Using polyisobutylene as a viscosity modifier significantly increases the oil's viscosity, thus obtaining a high-viscosity, highly adhesive lubricant.

[0031] Optionally, the defoamer is selected from one or more of silicone-based defoamers and polyether-modified silicone oil defoamers; the corrosion inhibitor is selected from at least one of benzotriazole, benzotriazole derivatives, and thiadiazole derivatives. The antioxidant is selected from at least one of N-phenyl-α-aniline, octylbutyldiphenylamine, and diisooctyldiphenylamine.

[0032] By adopting the above technical solutions, antioxidants and corrosion inhibitors are used to suppress lubricant oxidation and metal surface corrosion, ensuring stable performance during long-term use and improving the stability of the oil.

[0033] Secondly, this application provides a method for preparing a special lubricating oil composition for aluminum bronze turbine worm gears, using the following technical solution: A method for preparing a special lubricating oil composition for aluminum bronze turbine worm gears includes the following steps: Add trimethylolpropane ester, refined mineral oil, and thickener to the reactor, seal the vessel, apply vacuum, heat to 110-120℃, maintain the temperature and apply vacuum for dehydration for 1 hour (vacuum degree ≥ -0.08MPa), cool to 75-85℃, close the vacuum, open the vessel, add extreme pressure anti-wear agent, oiliness agent, oil-soluble molybdenum salt, antioxidant, corrosion inhibitor, and defoamer, stir for 30 minutes, filter and circulate for 15-20 minutes, filter and discharge.

[0034] By adopting the above technical solution and adding antioxidants, extreme pressure anti-wear agents, oiliness agents, oil-soluble molybdenum salts, corrosion inhibitors and defoamers, the oil has excellent surface properties in terms of oxidation life, anti-wear performance, anti-corrosion performance and anti-foaming performance, and has excellent overall performance.

[0035] In summary, this application has the following beneficial effects: 1. Because this application uses trimethylolpropane ester, refined mineral oil, and a viscosity modifier as base oil components, it avoids the insufficient compatibility of polyether synthetic base oils with aluminum bronze materials, extends the service life of the oil, and enhances the lubrication effect of the lubricating oil under high load conditions by optimizing the ratio of trimethylolpropane ester and refined mineral oil, reduces the friction loss of the turbine worm gear, and improves the lubrication performance of the oil. Moreover, through the synergistic effect of extreme pressure anti-wear agent, oiliness agent, and oil-soluble molybdenum salt, the anti-wear ability of the lubricating oil under extreme pressure is improved, the wear of the turbine worm gear is reduced, and the extreme pressure anti-wear properties of the oil are enhanced.

[0036] 2. In this application, sodium disilicate nanoparticles are preferably synthesized in situ on g-C3N4 sheets using water glass and sodium hydroxide. The two work synergistically to construct a tough and easy-slip protective film on the friction surface, improving the anti-wear and friction-reducing effects of the lubricating oil, enhancing extreme pressure anti-wear properties, and adding zinc stearate and sulfur powder during the synthesis of the composite material to form zinc sulfide, which gives the lubricating oil a lower coefficient of friction, higher load-bearing capacity and anti-wear performance, and better high-temperature stability. In addition, the use of oleic acid can improve the dispersion stability of the composite material in the lubricating oil and reduce precipitation or stratification. Detailed Implementation

[0037] The following embodiments provide a further detailed description of this application.

[0038] Preparation example of g-C3N4 / sodium disilicate composite material Preparation Example 1: (1) 10g of graphitic carbon nitride (g-C3N4) was added to deionized water and sonicated at 250W for 30min to obtain a suspension; 20g of water glass and 10g of sodium hydroxide were added to 200ml of deionized water and stirred evenly to obtain a reaction solution. The water glass was selected from Jinan Xinhaoyuan Chemical Co., Ltd., with the product number 32-456. (2) The suspension was added dropwise to the reaction solution under stirring at 200 r / min, and the dropping rate was controlled at 2 drops / second. After the addition was completed, the mixture was stirred at room temperature for 4 hours, then sealed and aged for 10 hours. After centrifugation, the mixture was washed with deionized water until the pH of the supernatant was 9. After filtration, the filter cake was freeze-dried to obtain the freeze-dried product. (3) The freeze-dried product was heated to 350°C at a rate of 5°C / min under an inert atmosphere (nitrogen) and kept at the temperature for 2 hours to obtain g-C3N4 supported sodium disilicate. (4) Disperse g-C3N4-loaded sodium disilicate into anhydrous ethanol at twice its mass, add oleic acid, stir at 80°C for 5 hours, centrifuge, wash with anhydrous ethanol, and dry to obtain g-C3N4 / sodium disilicate composite material. The mass ratio of oleic acid to g-C3N4-loaded sodium disilicate is 0.5:1.

[0039] Preparation Example 2: (1) 10g of graphitic carbon nitride (g-C3N4) was added to deionized water and sonicated at 250W for 30min to obtain a suspension; 20g of water glass and 10g of sodium hydroxide were added to 200ml of deionized water and stirred evenly to obtain a reaction solution. The water glass was selected from Jinan Xinhaoyuan Chemical Co., Ltd., with the product number 32-456. (2) The suspension was added dropwise to the reaction solution under stirring at 200 r / min, and the dropping rate was controlled at 2 drops / second. After the addition was completed, the mixture was stirred at room temperature for 4 hours, then sealed and aged for 10 hours. After centrifugation, the mixture was washed with deionized water until the pH of the supernatant was 9. After filtration, the filter cake was freeze-dried to obtain the freeze-dried product. (3) The freeze-dried product was mixed with 1.5g zinc stearate and 0.075g sulfur powder, and heated to 350℃ at a rate of 5℃ / min under an inert atmosphere (nitrogen) and kept at the temperature for 2h to obtain g-C3N4 supported sodium disilicate. (4) Disperse g-C3N4-loaded sodium disilicate into anhydrous ethanol at twice its mass, add oleic acid, stir at 80°C for 5 hours, centrifuge, wash with anhydrous ethanol, and dry to obtain g-C3N4 / sodium disilicate composite material. The mass ratio of oleic acid to g-C3N4-loaded sodium disilicate is 0.5:1. Example

[0040] In the following examples, the sources of each raw material are as follows: thiadiazole derivative is selected from Chuzhou Kanghua Electronic Materials Co., Ltd., model number T561; N-phenyl-α-aniline is selected from Chuzhou Kanghua Electronic Materials Co., Ltd., model number T531; organosilicon defoamer T901 is selected from Jinzhou Shengda Chemicals, product number 011; triphenyl thiophosphate is selected from Dongguan Blue Whale New Materials, model number T309; dimer acid is selected from Yichun Yongfeng Chemical, model number YF001; dialkyl dithiophosphate molybdenum oxide is selected from Luoyang Tongrun Nanotechnology, model number modtp; polyisobutylene is selected from Tianjin Yuehai Chemical, product number HY2300; refined mineral oil is selected from Guangdong Zhonghai Nanlian Energy, product number 500N; and trimethylolpropane oleate is selected from Shenzhen Saienbei Trading, model number Palmester2083.

[0041] Example 1: A special lubricating oil composition for aluminum bronze turbine worm gears, the raw material amounts are shown in Table 1, wherein trimethylolpropane ester is prepared by esterification reaction of trimethylolpropane and oleic acid, and its kinematic viscosity at 40°C is 46 mmHg. 2 The viscosity index is 187, and the refined mineral oil is a deeply hydrotreated isomerized dewaxed mineral oil with a kinematic viscosity of 90 mm³ / s at 40°C. 2 / s, the tackifier is polyisobutylene, and the kinematic viscosity of polyisobutylene at 100℃ is 1500 mm³ / s. 2 / s, the antioxidant is N-phenyl-α-aniline, the corrosion inhibitor is a thiadiazole derivative, the defoamer is organosilicon defoamer T901, the extreme pressure anti-wear agent is triphenyl thiophosphate, the oiliness agent is dimer acid, and the oil-soluble molybdenum salt is dialkyl dithiophosphate molybdenum oxide.

[0042] The preparation method of the above-mentioned special lubricating oil composition for aluminum bronze turbine worm gears includes the following steps: Clean the reaction vessel and preparation tools thoroughly. Then, add trimethylolpropane ester, refined mineral oil, and thickener to the reaction vessel, seal the vessel, evacuate the vacuum, heat to 120°C, maintain the temperature and evacuate the vacuum for 1 hour to dehydrate, with a vacuum degree ≥-0.08MPa. Cool down to 80°C, close the vacuum valve, open the lid and add extreme pressure anti-wear agent, oiliness agent, oil-soluble molybdenum salt, antioxidant, corrosion inhibitor, and defoamer. Stir for 30 minutes, turn on the filter, circulate for 15 minutes, filter, and discharge.

[0043] Table 1. Raw material amounts of the lubricating oil compositions in Examples 1-5 Examples 2-7: A special lubricating oil composition for aluminum bronze turbine worm gears, which differs from Example 1 in that the raw material amounts are shown in Table 1.

[0044] Example 8: A special lubricating oil composition for aluminum bronze turbine worm gears, differing from Example 1 in that the lubricating oil composition also contains 1.5g of solid lubricant, which is a g-C3N4 / sodium disilicate composite material, and the g-C3N4 / sodium disilicate composite material is prepared using the method described in Example 1. The preparation method of this lubricating oil composition is as follows: Clean the reaction vessel and preparation tools thoroughly. Then, add trimethylolpropane ester, refined mineral oil, and thickener to the reaction vessel, seal the vessel, and evacuate it. Heat the vessel to 120°C, maintain the temperature under vacuum for 1 hour to dehydrate it, ensuring a vacuum degree of ≥-0.08 MPa. Cool the vessel to 80°C, close the vacuum valve, open the lid, and add solid lubricant, extreme pressure anti-wear agent, oiliness agent, oil-soluble molybdenum salt, antioxidant, corrosion inhibitor, and defoamer. Stir for 30 minutes, turn on the filter, circulate for 15 minutes, filter, and discharge the material.

[0045] Example 9: A special lubricating oil composition for aluminum bronze turbine worm gears, differing from Example 1 in that the lubricating oil composition also contains 1g of solid lubricant, which is a g-C3N4 / sodium disilicate composite material, and the g-C3N4 / sodium disilicate composite material is prepared using the method in Preparation Example 1. The preparation method of this lubricating oil composition is as follows: Clean the reaction vessel and preparation tools thoroughly. Then, add trimethylolpropane ester, refined mineral oil, and thickener to the reaction vessel, seal the vessel, and evacuate it. Heat the vessel to 120°C, maintain the temperature under vacuum for 1 hour to dehydrate it, ensuring a vacuum degree of ≥-0.08 MPa. Cool the vessel to 80°C, close the vacuum valve, open the lid, and add solid lubricant, extreme pressure anti-wear agent, oiliness agent, oil-soluble molybdenum salt, antioxidant, corrosion inhibitor, and defoamer. Stir for 30 minutes, turn on the filter, circulate for 15 minutes, filter, and discharge the material.

[0046] Example 10: A special lubricating oil composition for aluminum bronze turbine worm gears, differing from Example 1 in that the lubricating oil composition also contains 1.5g of solid lubricant, which is a g-C3N4 / sodium disilicate composite material, and the g-C3N4 / sodium disilicate composite material is prepared using the method described in Preparation Example 2. The preparation method of this lubricating oil composition is as follows: Clean the reaction vessel and preparation tools thoroughly. Then, add trimethylolpropane ester, refined mineral oil, and thickener to the reaction vessel, seal the vessel, and evacuate it. Heat the vessel to 120°C, maintain the temperature under vacuum for 1 hour to dehydrate it, ensuring a vacuum degree of ≥-0.08 MPa. Cool the vessel to 80°C, close the vacuum valve, open the lid, and add solid lubricant, extreme pressure anti-wear agent, oiliness agent, oil-soluble molybdenum salt, antioxidant, corrosion inhibitor, and defoamer. Stir for 30 minutes, turn on the filter, circulate for 15 minutes, filter, and discharge the material.

[0047] Comparative Example Comparative Example 1: A special lubricating oil composition for aluminum bronze turbine worm gears, which differs from Example 1 in that no thickener is added.

[0048] Comparative Example 2: A special lubricating oil composition for aluminum bronze turbine worm gears, which differs from Example 1 in that an equal amount of refined mineral oil is used instead of a thickener.

[0049] Comparative Example 3: A special lubricating oil composition for aluminum bronze turbine worm gears, which differs from Example 1 in that an equal amount of extreme pressure anti-wear agent is used instead of oil-soluble molybdenum salt.

[0050] Comparative Example 4: A special lubricating oil composition for aluminum bronze turbine worm gears, which differs from Example 1 in that an equal amount of oiliness agent is used to replace the oil-soluble molybdenum salt.

[0051] Comparative Example 5: A special lubricating oil composition for aluminum bronze turbine worm gears, which differs from Example 1 in that an equal amount of extreme pressure anti-wear agent is used instead of the oiliness agent.

[0052] Performance testing The lubricating oil compositions were prepared according to the methods in the examples and comparative examples, and the various properties of the lubricating oil compositions were tested according to the following methods. The test results are recorded in Table 2.

[0053] 1. Kinematic viscosity (40℃): Tested in accordance with GB / T265-1988 "Determination of kinematic viscosity and calculation of dynamic viscosity of petroleum products".

[0054] 2. Viscosity index: The viscosity index shall be calculated and tested in accordance with GB / T1995-1998 "Calculation method of viscosity index of petroleum products".

[0055] 3. Flash point (open cup): Tested according to GB / T3536-2008 "Determination of flash point and fire point of petroleum products - Cleveland open cup method".

[0056] 4. Pour point: Tested in accordance with GB / T3535-2006 "Determination of Pour Point of Petroleum Products".

[0057] 5. Corrosion resistance: Tested in accordance with GB / T5096-2017 "Test Method for Corrosion of Copper Sheets in Petroleum Products".

[0058] 6. Extreme pressure (four-ball method): Tested in accordance with GB / T3142-2019 "Determination of load-carrying capacity of lubricants (four-ball method)".

[0059] 7. Wear resistance (four-ball method): Tested in accordance with GB / T3142-2019 "Determination of load-carrying capacity of lubricants (four-ball method)".

[0060] 8. Foaming characteristics: Tested according to GB / T12579-2002 "Determination of foaming characteristics of lubricating oil".

[0061] Table 2 Performance test results of lubricating oil compositions Continued from Table 2 As can be seen from the data in Table 2, the lubricating oil compositions prepared by changing the ratio of extreme pressure anti-wear agent, oiliness agent and oil-soluble molybdenum salt in Examples 1-3 have high open flash points and excellent high-temperature thermal stability, which can meet the requirements of relatively harsh high-temperature operating environments. At the same time, they also have excellent anti-corrosion performance and excellent anti-wear performance. The maximum non-seize load value of the four-ball method is above 1350N, and the wear scar diameter is no greater than 0.38mm. They can effectively protect the equipment from wear during long-term use and have excellent lubrication effect.

[0062] Compared with Example 1, Examples 4-5 changed the ratio of trimethylolpropane ester to refined mineral oil, while Examples 6 and 7 changed the amount of thickener compared with Example 1. As can be seen from the data in Table 2, the lubricating oil compositions prepared in Examples 4-7 still have a high flash point, a low pour point, excellent high temperature resistance, and good anti-wear and lubrication effects.

[0063] Compared to Example 1, Examples 8 and 9 also added a solid lubricant to the lubricating oil composition and used the g-C3N4 / sodium disilicate composite material prepared in Example 1. As shown in Table 2, the maximum non-seize load value of the lubricating oil compositions prepared in Examples 8 and 9 increased in the four-ball method, the wear scar diameter decreased, the lubrication effect was enhanced, and the open flash point increased, and the high temperature resistance was improved.

[0064] Compared to Example 1, Example 10 uses a g-C3N4 / sodium disilicate composite material containing zinc sulfide. It can be seen that the lubricating oil composition prepared in Example 10 has better lubrication, friction reduction and anti-wear properties, and extreme pressure properties, which can effectively reduce wear between the turbine and worm gear.

[0065] Compared with Example 1, Comparative Example 1 did not add a thickener and only contained trimethylolpropane ester and refined mineral oil in a mass ratio of 35:35.85. In Comparative Example 2, a thickener was used to replace the refined mineral oil in equal amounts, that is, the mass ratio of trimethylolpropane ester and refined mineral oil was 35:60.85. As can be seen from the data comparison in Table 2, the kinematic viscosity and viscosity index of the lubricating oil composition in Comparative Example 1 increased, while the flash point and pour point did not change much. However, the wear scar diameter increased significantly, and the maximum non-seize load decreased. This indicates that the thickener can increase the viscosity of the base oil, improve the oil film strength, and increase the lubrication effect. The kinematic viscosity and viscosity index of the lubricating oil composition prepared in Comparative Example 2 increased, the foaming characteristics deteriorated, and the wear scar diameter increased, resulting in a decrease in lubrication effect.

[0066] Compared with Example 1, Comparative Example 3 used an equal amount of extreme pressure anti-wear agent to replace the oil-soluble molybdenum salt, that is, the mass ratio of extreme pressure anti-wear agent and oiliness agent in the lubricating oil composition was 2:1.5. Compared with Example 1, Comparative Example 4 used an equal amount of oiliness agent to replace the oil-soluble molybdenum salt, that is, the lubricating oil composition contained 1.5:2 extreme pressure anti-wear agent and oiliness agent. Comparative Example 5 contained extreme pressure anti-wear agent and oil-soluble molybdenum salt in a mass ratio of 3:0.5. As can be seen from the data in Table 2, the maximum non-seize load of the lubricating oil compositions prepared in Comparative Examples 3-5 decreased, the wear scar diameter increased, and the lubrication effect decreased.

[0067] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A special lubricating oil composition for aluminum bronze turbine worm gears, characterized in that, The raw materials include the following parts by weight: 30-40 parts of trimethylolpropane ester, 21.4-47.19 parts of refined mineral oil, 20-30 parts of thickener, 1-2.5 parts of extreme pressure anti-wear agent, 1-2.5 parts of oiliness agent, 0.3-1.2 parts of oil-soluble molybdenum salt, 0.3-1.5 parts of antioxidant, 0.2-0.8 parts of corrosion inhibitor, and 0.01-0.1 parts of defoamer.

2. The lubricating oil composition for aluminum bronze worm gears according to claim 1, characterized in that: The extreme pressure anti-wear agent is selected from at least one of triphenyl thiophosphate, ammonium phosphate salt, and ammonium thiophosphate salt; The oiliness agent is selected from at least one of dimer acid, ethylene glycol oleate, and benzotriazole amine salt; The oil-soluble molybdenum salt is selected from at least one of dialkyl dithiophosphate molybdenum oxydicarboxylate and dialkyl dithiocarbamate molybdenum.

3. The lubricating oil composition for aluminum bronze worm gears according to claim 2, characterized in that: The mass ratio of the triphenyl thiophosphate, dimer acid, and dialkyl dithiophosphate molybdenum oxide is 1.5:1.5:0.

5.

4. The lubricating oil composition for aluminum bronze worm gears according to claim 1, characterized in that: The lubricating oil composition also contains a solid lubricant, and the mass ratio of the solid lubricant to the extreme pressure anti-wear agent is 1-1.5:1.

5. The solid lubricant is a g-C3N4 / sodium disilicate composite material.

5. The lubricating oil composition for aluminum bronze worm gears according to claim 4, characterized in that: The g-C3N4 / sodium disilicate composite material also contains zinc sulfide.

6. The lubricating oil composition for aluminum bronze worm gears according to claim 1, characterized in that: The trimethylolpropane ester is prepared by esterification of C12-C18 saturated / unsaturated fatty acids with trimethylolpropane, and has a kinematic viscosity of 40-100 mmHg at 40°C. 2 / s, viscosity index ≥120.

7. The lubricating oil composition for aluminum bronze worm gears according to claim 1, characterized in that: The refined mineral oil is a deeply hydrotreated isomerized dewaxed base oil with a kinematic viscosity of 80-120 mmHg at 40°C. 2 / s.

8. The lubricating oil composition for aluminum bronze worm gears according to claim 1, characterized in that: The tackifier is selected from at least one of polyisobutylene and ethylene propylene rubber, and the kinematic viscosity of the tackifier at 100°C is 800-1500 mmHg. 2 / s.

9. The lubricating oil composition for aluminum bronze worm gears according to claim 1, characterized in that: The defoamer is selected from one or more of organosilicon defoamers and polyether-modified silicone oil defoamers; The corrosion inhibitor is selected from at least one of benzotriazole, benzotriazole derivatives, and thiadiazole derivatives; The antioxidant is selected from at least one of N-phenyl-α-aniline, octylbutyldiphenylamine, and diisooctyldiphenylamine.

10. A method for preparing the special lubricating oil composition for aluminum bronze turbine worm gears according to any one of claims 1-9, characterized in that: Includes the following steps: Add trimethylolpropane ester, refined mineral oil, and thickener to the reactor, seal the vessel, apply vacuum, heat to 110-120℃, maintain the temperature and apply vacuum for dehydration for 1 hour (vacuum degree ≥ -0.08MPa), cool to 75-85℃, close the vacuum, open the vessel, add extreme pressure anti-wear agent, oiliness agent, oil-soluble molybdenum salt, antioxidant, corrosion inhibitor, and defoamer, stir for 30 minutes, filter and circulate for 15-20 minutes, filter and discharge.

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