A biodegradable semi-fluid lubricant for locomotive wheel flanges and its preparation method

Abstract

This application relates to the field of lubricating materials, specifically disclosing a biodegradable semi-fluid lubricant for locomotive wheel flanges and its preparation method. The biodegradable semi-fluid lubricant for locomotive wheel flanges comprises the following raw materials in parts by weight: 35-58.4 parts trimethylolpropane ester, 30-40 parts vegetable oil, 5-10 parts thickener, 1-3 parts extreme pressure anti-wear agent, 0.5-2 parts antioxidant, 0.1-1 parts rust inhibitor, and 5-10 parts solid filler. The biodegradable semi-fluid lubricant for locomotive wheel flanges of this application exhibits excellent viscosity-temperature properties, extreme pressure anti-wear properties, water resistance, rust prevention, pumpability, and atomization properties. It also has a high biodegradability rate, avoiding pollution to soil and water bodies, and is suitable for lubrication and protection of locomotive wheel flanges in various environments.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lubricating materials, more particularly, it relates to a biodegradable semi-fluid lubricant for locomotive wheel flanges and a preparation method thereof. BACKGROUND

[0002] The wheel flange refers to the inner side part of the railway wheel profile, which has the functions of guiding and preventing derailment. During the running of the train, due to the inclination, the wheel flange of the train will contact the inner side of the rail, thereby causing frequent friction. Especially when the train runs on a curved road section, due to the centrifugal force, the wheel is pressed against the rail, causing the inner side of the rail to rub against the wheel flange severely and thus shortening the service life of the rail and the wheel.

[0003] At present, the mainstream measure is to install a spraying device on the locomotive, and spray lubricant to the inner side of the wheel flange according to the frequency set in advance during the running. This plays an important role in reducing wheel-rail wear, prolonging the service life of the wheel-rail, reducing noise pollution, and reducing traction energy consumption, and can also save a large amount of production and maintenance costs.

[0004] Lubricating grease is easy to pollute soil, water and air, destroy the ecological environment and ecological balance due to penetration, leakage, overflow and improper handling during lubrication. The research on "environmentally friendly" and "biodegradable" green lubricants abroad began in the 1970s. So far, the types and quantities of biodegradable lubricants abroad have developed rapidly, mainly including engine oil, hydraulic oil, lubricating oil and gear oil; the market share of different biodegradable products is respectively 22% for hydraulic oil, 1% for gear oil, 4% for lubricating grease, and 8% for other types. Generally, plant oil and synthetic ester are used as base oil, lithium soap, calcium soap, composite lithium soap and bentonite are used as thickening agent, and various additives with different purposes are added to prepare lubricating grease that can meet the needs of various mechanical lubrication. The Chinese invention with the application number CN2012105663399 discloses a biodegradable lubricating grease for locomotive wheel flanges and a preparation method thereof. The invention adopts one-step saponification synthesis method, i.e. lithium stearate-calcium soap thickening diisooctyl adipate and epoxy soybean oil, and adds antioxidants, rust inhibitors, extreme pressure wear-resistant agents, tackifiers and graphite to prepare the lubricating grease. The inventor finds that the biodegradability of the lubricating grease is difficult, and the biodegradation rate needs to be improved. SUMMARY

[0005] In order to improve the biodegradation rate of the lubricant and reduce the pollution of the lubricating grease to soil, water and the like, the present application provides a biodegradable semi-fluid lubricant for locomotive wheel flanges and a preparation method thereof.

[0006] In the first aspect, the present application provides a biodegradable semi-fluid lubricant for locomotive wheel flanges, which adopts the following technical solution:

[0007] A biodegradable semi-fluid lubricant for locomotive wheel flanges comprises the following raw materials in parts by weight: 35-58.4 parts of trimethylolpropane ester, 30-40 parts of vegetable oil, 5-10 parts of thickener, 1-3 parts of extreme pressure anti-wear agent, 0.5-2 parts of antioxidant, 0.1-1 parts of rust inhibitor, and 5-10 parts of solid filler.

[0008] By adopting the above technical solution and reasonably controlling the amount of each raw material, the resulting lubricant has excellent biodegradability and will not cause pollution to soil, water, etc. It is suitable for lubrication and protection of locomotive wheel flanges, and has excellent viscosity-temperature properties, good extreme pressure anti-wear properties, excellent water resistance and rust prevention, good pumpability and atomization properties.

[0009] Optionally, the kinematic viscosity of the trimethylolpropane ester at 40°C is 40-80 mm. 2 / s, pour point ≤ -40℃, acid value ≤ 0.1mgKOH / g.

[0010] By adopting the above technical solution, trimethylolpropane ester is a C5-C12 saturated fatty acid trimethylolpropane ester, which has excellent low-temperature performance, enabling the lubricant to be sprayed and atomized normally at low temperatures. It has good sensitivity to extreme pressure anti-wear agents and antioxidants, thus ensuring that the additives can fully exert their effects. Moreover, it has strong solubility and good solubility for thickeners, antioxidants, rust inhibitors and other additives, which improves the stability of the lubricant system. In addition, it has good biodegradability, which can avoid the pollution of soil and water bodies by emulsifiers.

[0011] Optionally, the thickener is selected from one or both of hydrated magnesium silicate gel and hydrated aluminum silicate gel.

[0012] By adopting the above technical solution, the specific surface area of ​​the thickener is 200-400m². 2 / g can be directly added to the lubricant system, and the lubricant can be prepared by stirring without the need for pretreatment with polar activators. Moreover, it can form a stable three-dimensional network structure in the system, which can avoid the sedimentation of itself, additives and solid fillers, and improve the stability of the lubricant system. Furthermore, it can utilize the thixotropic fluidity characteristics of hydrated magnesium silicate gel and hydrated aluminum silicate gel to make the lubricant system produce high thixotropy.

[0013] Optionally, the thickener comprises hydrated magnesium silicate gel and hydrated aluminum silicate gel in a mass ratio of 1:1-1.25.

[0014] By adopting the above technical solution, the combined effect of hydrated magnesium silicate gel and hydrated aluminum silicate gel at the above dosage ratio can give the lubricant better system stability and prevent sedimentation.

[0015] Optionally, the extreme pressure anti-wear agent is selected from one of dialkyl dithiomolybdenum or dialkyl dithiocarbamate.

[0016] By adopting the above technical solution, at various points and tips under high load pressure, dialkyl molybdenum dithiocarbamate and dialkyl molybdenum dithiocarbamate can undergo chemical reactions, promoting the decomposition of organic molybdenum and decomposing it into molybdenum disulfide and certain phosphides, sulfides, nitrides, etc. These decomposition products are dispersed in the oil solvent, adsorbed and deposited on the friction surface, and molybdenum disulfide forms a film that covers the anti-wear layer, thereby achieving the effects of friction reduction, anti-wear and lubrication. Within the above dosage range, it can meet the requirements of rapid biodegradation and anti-wear needs.

[0017] Optionally, the rust inhibitor is selected from barium dinonylnaphthalenesulfonate and dodecenyl succinic acid.

[0018] By employing the above technical solutions, the polar groups in the rust inhibitor molecules have a strong adsorption force on the metal surface, forming a tight monomolecular or multimolecular protective layer on the metal surface, preventing corrosive media such as oxygen from contacting the metal, thus playing a rust-preventing role. At the same time, the rust inhibitor also has a solubilizing, dispersing, or deactivating effect on water and some corrosive substances, thereby eliminating the corrosion of metals by corrosive substances.

[0019] Optionally, the antioxidant is selected from N-phenyl-α-aniline and diisooctyldiphenylamine.

[0020] By adopting the above technical solutions, the oxidation stability of lubricants can be improved, ensuring that the grease can be used for a long time.

[0021] Optionally, the vegetable oil is selected from one or both of soybean oil and sunflower seed oil.

[0022] By adopting the above technical solutions, soybean oil and sunflower seed oil have an acid value ≤0.1mgKOH / g and impurities ≤0.1%, exhibiting excellent biodegradability. This avoids pollution of soil and water by lubricants, meeting environmental protection requirements. Furthermore, the lipid molecules of soybean oil and sunflower seed oil are highly polar, capable of adsorbing onto metal surfaces to form an oil layer of adhesive molecular oil film, ensuring lubricity. They also have excellent wettability for solid fillers, ensuring that solid fillers maintain uniform dispersion in the lubricant system for a long time.

[0023] Optionally, the solid filler is selected from either titanium dioxide or calcium carbonate powder.

[0024] By adopting the above technical solution, the particle size of calcium carbonate micro powder and titanium dioxide is ≥800. Solid fillers can be deposited on the friction surface to form a single or multiple layer covering film with low stress, which can enhance the oil film thickness and strength, while reducing the friction coefficient and enhancing the load-bearing capacity.

[0025] Secondly, this application provides a method for preparing a biodegradable semi-fluid lubricant for locomotive wheel flanges, employing the following technical solution:

[0026] A method for preparing a biodegradable semi-fluid lubricant for locomotive wheel flanges includes the following steps:

[0027] S1. Mix trimethylolpropane ester, vegetable oil and thickener, and stir at 3000-35000 r / min for 25-30 min;

[0028] S2. Add extreme pressure anti-wear agent, antioxidant, rust inhibitor and solid filler to the product obtained in step S1 in sequence, and stir at a speed of 1000-1500 r / min for 8-10 min. Remember to use biodegradable semi-fluid lubricant for locomotive wheel flanges.

[0029] By adopting the above technical solution, trimethylolpropane ester, vegetable oil and thickener are mixed and then other additives are added in sequence, so that the lubricant has good dispersion stability and the preparation method is simple and easy to operate.

[0030] In summary, this application has the following beneficial effects:

[0031] 1. Due to the appropriate raw material combination used in this application, the biodegradable semi-fluid lubricant for locomotive wheel flanges has excellent viscosity-temperature properties, extreme pressure anti-wear properties, water resistance, rust prevention, pumpability, and atomization properties. It can effectively reduce the friction between locomotive wheel flanges and rails, reduce friction loss during train operation, and extend the service life of rails and wheels. It also has excellent biodegradable properties, avoiding the pollution of soil, water bodies, etc., and damage to the ecological environment caused by the lubricant due to penetration, leakage, overflow, and mechanical failure (such as nozzle dripping or inaccurate spray direction). Detailed Implementation

[0032] Example

[0033] Example 1: A biodegradable semi-fluid lubricant for locomotive wheel flanges, the raw material dosages are shown in Table 1, wherein the kinematic viscosity of trimethylolpropane ester at 40°C is 40 mm. 2 / s, pour point ≤ -40℃, acid value ≤ 0.1mgKOH / g, vegetable oil acid value ≤ 0.1mgKOH / g, impurities ≤ 0.1%, thickener specific surface area 300m² 2 / g, the particle size of the solid filler is 800 mesh.

[0034] The preparation method of the above-mentioned biodegradable semi-fluid lubricant for locomotive wheel flanges includes the following steps:

[0035] S1. According to the amount of raw materials in Table 1, add trimethylolpropane ester, grade 1 soybean oil and hydrated magnesium silicate gel together into a stainless steel bucket and stir at 3000 r / min for 30 min.

[0036] S2. Add molybdenum dialkyl dithiophosphate, N-phenyl-α-aniline (T531), barium dinonylnaphthalenesulfonate (T705) and titanium dioxide sequentially to the product obtained in step S1, and stir at 1000 r / min for 10 min to obtain the finished product.

[0037] Table 1. Raw material dosage of biodegradable semi-fluid lubricant for locomotive wheel flanges in Examples 1-8.

[0038]

[0039] Examples 2-8: A biodegradable semi-fluid lubricant for locomotive wheel flanges, the raw material amounts are shown in Table 1, and the preparation method is as follows:

[0040] S1, trimethylolpropane ester (V 40 =50mm 2 Add the first-grade soybean oil, hydrated magnesium silicate gel, and hydrated aluminum silicate gel to a stainless steel container and stir at 3000 r / min for 30 min.

[0041] S2. Add molybdenum dialkyldithiocarbamate, diisooctyl diphenylamine (T534), barium dinonylnaphthalenesulfonate and titanium dioxide sequentially to the product obtained in step S1, and stir at 1000 r / min for 10 min to obtain the finished product.

[0042] Example 3: A biodegradable semi-fluid lubricant for locomotive wheel flanges, the raw material amounts are shown in Table 1, and the preparation method is as follows:

[0043] S1, trimethylolpropane ester (V 40 =60mm 2 Add the first-grade sunflower seed oil and hydrated aluminum silicate gel together to a stainless steel bucket and stir at 3000 r / min for 30 min.

[0044] S2. Add molybdenum dialkyldithiocarbamate, diisooctyl diphenylamine (T534), dodecenyl succinic acid (T746), and calcium carbonate powder to the product obtained in step S1 in sequence, and stir at 1000 r / min for 10 min to obtain the finished product.

[0045] Example 4: A biodegradable semi-fluid lubricant for locomotive wheel flanges, the raw material amounts are shown in Table 1, and the preparation method is as follows:

[0046] S1, trimethylolpropane ester (V 40=70mm 2 Add the first-grade sunflower seed oil and hydrated aluminum silicate gel together to a stainless steel bucket and stir at 3000 r / min for 30 min.

[0047] S2. Add molybdenum dialkyl dithiophosphate, N-phenyl-α-aniline (T531), dodecenyl succinic acid (T746), and calcium carbonate powder to the product obtained in step S1 in sequence, and stir at 1000 r / min for 10 min to obtain the finished product.

[0048] Example 5: A biodegradable semi-fluid lubricant for locomotive wheel flanges, the raw material amounts are shown in Table 1, and the preparation method is as follows:

[0049] S1, trimethylolpropane ester (V 40 =80mm 2 Add the first-grade sunflower seed oil, first-grade soybean oil and hydrated magnesium silicate gel to a stainless steel container and stir at 3000 r / min for 30 min.

[0050] S2. Add molybdenum dialkyl dithiophosphate, N-phenyl-α-aniline (T531), barium dinonylnaphthalenesulfonate (T705) and titanium dioxide sequentially to the product obtained in step S1, and stir at 1000 r / min for 10 min to obtain the finished product.

[0051] Example 6: A biodegradable semi-fluid lubricant for locomotive wheel flanges, the raw material amounts are shown in Table 1, and the preparation method is as follows:

[0052] S1, trimethylolpropane ester (V 40 =50mm 2 Add the first-grade sunflower seed oil, first-grade soybean oil, hydrated magnesium silicate gel, and hydrated aluminum silicate gel to a stainless steel container and stir at 3000 r / min for 30 min.

[0053] S2. Add molybdenum dialkyldithiocarbamate, diisooctyl diphenylamine (T534), 0.5 parts of dodecenyl succinic acid (T746) and titanium dioxide to the product obtained in step S1 in sequence, and stir at 1000 r / min for 10 min to obtain the finished product.

[0054] Example 7: A biodegradable semi-fluid lubricant for locomotive wheel flanges, the raw material amounts are shown in Table 1, and the preparation method is as follows:

[0055] S1, trimethylolpropane ester (V 40 =60mm 2 Add the first-grade soybean oil and hydrated magnesium silicate gel to a stainless steel container and stir at 3000 r / min for 30 min.

[0056] S2. Add molybdenum dialkyl dithiophosphate, N-phenyl-α-aniline (T531), barium dinonylnaphthalenesulfonate (T705), and calcium carbonate powder to the product obtained in step S1 in sequence, and stir at 1000 r / min for 10 min to obtain the finished product.

[0057] Example 8: A biodegradable semi-fluid lubricant for locomotive wheel flanges, the raw material amounts are shown in Table 1, and the preparation method is as follows:

[0058] S1, trimethylolpropane ester (V 40 =70mm 2 Add the first-grade sunflower seed oil, hydrated magnesium silicate gel, and hydrated aluminum silicate gel to a stainless steel bucket and stir at 3000 r / min for 30 min.

[0059] S2. Add molybdenum dialkyldithiocarbamate, diisooctyl diphenylamine (T534), dodecenyl succinic acid (T746) and titanium dioxide sequentially to the product obtained in step S1, and stir at 1000 r / min for 10 min to obtain the finished product.

[0060] Example 9: A biodegradable semi-fluid lubricant for locomotive wheel flanges, which differs from Example 1 in that the thickener includes 4 kg of hydrated magnesium silicate gel and 2 kg of hydrated aluminum silicate gel.

[0061] Example 10: A biodegradable semi-fluid lubricant for locomotive wheel flanges, which differs from Example 1 in that the thickener includes 2.4 kg of hydrated magnesium silicate gel and 3.6 kg of hydrated aluminum silicate gel.

[0062] Comparative Example

[0063] Comparative Example 1: A wheel and rail grease: Foster TRAMLUB F 234MOD 2. This grease uses vegetable and synthetic oils as base oils and employs an inorganic thickener.

[0064] Comparative Example 2: A wheel and rail grease: Great Wall's new JH-1 wheel and rail grease, which is made by thickening synthetic oil with hydroxy stearic acid soap and adding additives and graphite.

[0065] Comparative Example 3: A biodegradable semi-fluid lubricant for locomotive wheel flanges, which differs from Example 1 in that an equal amount of thickener is used instead of a thickener. The thickener comprises 12-hydroxystearic acid in a mass ratio of 1:1 and an aqueous solution of lithium hydroxide with a concentration of 15 wt%.

[0066] Comparative Example 4: A biodegradable semi-fluid lubricant for locomotive wheel flanges, which differs from Example 1 in that the thickener is YH-938Y organic bentonite.

[0067] Comparative Example 5: A biodegradable semi-fluid lubricant for locomotive wheel flanges, which differs from Example 1 in that an equal amount of trimethylolpropane ester is used instead of vegetable oil.

[0068] Performance testing

[0069] I. Performance testing of lubricants: Lubricants were prepared according to the methods in the examples and comparative examples, and their performance was tested according to the following methods. The test results are recorded in Table 2.

[0070] 1. Appearance: Visual inspection;

[0071] 2. Rotational viscosity: The rotational viscosity of the lubricant at 40℃ was tested using an NDJ-5S digital rotational viscometer.

[0072] 3. Corrosion: Tested according to GB / T7326-1987 "Corrosion Test Method for Copper Strips of Lubricating Grease";

[0073] 4. Evaporation rate: Tested according to SH / T0337-1992 "Determination of Evaporation Rate of Lubricating Grease";

[0074] 5. Similar viscosity: Tested according to SH / T0048-91 "Method for Determination of Similar Viscosity of Lubricating Grease";

[0075] 6. Extreme pressure performance (four-ball method): Tested according to SH / T0202-1992 "Determination of extreme pressure performance of lubricating grease (four-ball method)";

[0076] 7. Biodegradation rate: Referring to the CECL-33-A-90 method, the supernatant of activated sludge from a wastewater treatment plant was used as the inoculum. 5 ml of bacterial solution and 1 g of lubricant were added to 100 ml of mineral salt solution culture medium. The mixture was cultured in a constant temperature shaker at 25℃ for 21 days. The biodegradation rate of the lubricant was characterized by the amount of lubricant consumed during the biodegradation process. The composition of the mineral salt liquid culture medium was: Na2HPO4·3H2O: 2.0 g / L; KH2PO4: 0.6 g / L; MgSO4·7H2O: 0.1 g / L; NH4NO3: 0.3 g / L; (NH4)2·SO4: 0.4 g / L; CaCl2: 0.1 g / L; trace elements: trace amounts; pH: 7.0-7.2.

[0077] 8. Wear Rate: The tribological properties of the lubricant were evaluated using an SRV-IV micro-vibration wear tester manufactured by Optimal GmbH, Germany. The contact method of the friction pair was ball-disc contact. The upper sample was an AISI 52100 standard steel ball with a size of φ10mm and a hardness of HRC65-67, and the lower sample was an AISI 1045 standard disc with a size of φ24mm×8mm and a hardness of HRC27-31. During the test, the lower sample remained stationary while the upper sample underwent periodic reciprocating motion. The test was conducted with a load of 100N, an amplitude of 1mm, a frequency of 30Hz, a duration of 60min, and a temperature of 50℃. After the test, the lower sample was cleaned with acetone. Subsequently, the wear volume of the lower sample was measured using an Olympus LEXT OLS4000 3D measurement laser confocal microscope. The wear volume measurement was repeated three times, and the average value was taken. The wear rate was then calculated. Wear rate (mm) 3 The formula for calculating wear rate (N·m) is: Wear rate = Wear volume / (Load × Formation).

[0078] Table 2 Performance Testing of Biodegradable Semi-fluid Lubricants for Locomotive Wheel Flanges

[0079]

[0080]

[0081] As can be seen from the data in Table 2, the biodegradable semi-fluid lubricant for locomotive wheel flanges of this application not only has excellent extreme pressure anti-wear properties, low evaporation loss and excellent protective performance, but also has a wide operating range (-30℃ to +40℃) and excellent biodegradability, which meets the long-term lubrication and protection of locomotive wheel flanges and avoids the adverse impact of lubricants on the ecological environment.

[0082] II. Dispersibility of Lubricants: 10 ml of each of the lubricants prepared in Examples 1, 2, 3, 6, 9, 10 and Comparative Examples 1-4 were measured, placed in test tubes, and left to stand for 24 h. The change in sedimentation volume during the period was recorded and the results are shown in Table 3.

[0083] Table 3 Results of Lubricant Dispersibility Test

[0084]

[0085] The data in Table 3 show that in Example 1, hydrated magnesium silicate gel was used as a thickener; in Example 3, hydrated aluminum silicate gel was used as a thickener; and in Examples 2 and 4, a mixture of hydrated magnesium silicate gel and hydrated aluminum silicate gel was used as a thickener. The lubricants prepared in Examples 1, 2, 3, and 6 showed sedimentation after prolonged standing, with Examples 1 and 3 showing the greatest sedimentation. Compared to Example 2, Example 9 used hydrated magnesium silicate gel and hydrated aluminum silicate gel in a mass ratio of 1:0.5 as a thickener, while Example 10 used a mixture of hydrated magnesium silicate gel and hydrated aluminum silicate gel in a mass ratio of 1:0.5. The thickeners selected were hydrated magnesium silicate gel and hydrated aluminum silicate gel in a mass ratio of 1:1.5. The data in Table 3 show that the lubricants prepared in Examples 9 and 10 showed a higher amount of sedimentation after standing for 24 hours than those in Example 2, indicating that the ratio of hydrated magnesium silicate gel to hydrated aluminum silicate gel in the thickener was lower than that in Example 2. Comparative Examples 1 and 2 were commercially available greases, which showed severe stratification after standing for a long time. Comparative Examples 3 and 4 used organic and inorganic composite thickeners and inorganic thickeners, respectively, and the resulting lubricants had lower dispersion stability than those in Example 1, with greater stratification and sedimentation.

[0086] 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 biodegradable semi-fluid lubricant for locomotive wheel flanges, characterized in that, It is composed of the following raw materials in parts by weight: 35-58.4 parts of trimethylolpropane ester, 30-40 parts of vegetable oil, 5-10 parts of thickener, 1-3 parts of extreme pressure anti-wear agent, 0.5-2 parts of antioxidant, 0.1-1 parts of rust inhibitor, and 5-10 parts of solid filler; The trimethylolpropane ester is a C5-C12 saturated fatty acid trimethylolpropane ester with a kinematic viscosity of 40-80 mmHg at 40°C. 2 / s, pour point ≤ -40℃, acid value ≤ 0.1mgKOH / g; The thickener is a hydrated magnesium silicate gel and a hydrated aluminum silicate gel with a mass ratio of 1:1-1.25, and the specific surface area of ​​the thickener is 200-400 m². 2 / g; The solid filler is selected from either titanium dioxide or calcium carbonate micro powder, with the particle size of calcium carbonate micro powder and titanium dioxide being ≥800 mesh.

2. The biodegradable semi-fluid lubricant for locomotive wheel flanges according to claim 1, characterized in that, The extreme pressure anti-wear agent is selected from one of dialkyl dithiomolybdenum or dialkyl dithiocarbamate.

3. The biodegradable semi-fluid lubricant for locomotive wheel flanges according to claim 1, characterized in that, The rust inhibitor is selected from barium dinonylnaphthalenesulfonate and dodecenylsuccinic acid.

4. The biodegradable semi-fluid lubricant for locomotive wheel flanges according to claim 1, characterized in that, The antioxidant is selected from N-phenyl-α-aniline and diisooctyldiphenylamine.

5. The biodegradable semi-fluid lubricant for locomotive wheel flanges according to claim 1, characterized in that, The vegetable oil is selected from one or both of soybean oil and sunflower seed oil.

6. The method for preparing the biodegradable semi-fluid lubricant for locomotive wheel flanges according to any one of claims 1-5, characterized in that, Includes the following steps: S1. Mix trimethylolpropane ester, vegetable oil and thickener, and stir at 3000-35000 r / min for 25-30 min; S2. Add extreme pressure anti-wear agent, antioxidant, rust inhibitor and solid filler to the material obtained in step S1 in sequence, and stir at a speed of 1000-1500 r / min for 8-10 min to obtain biodegradable semi-fluid lubricant for locomotive wheel flanges.

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