Lubricating composition for gearbox of high-speed motor train unit and preparation method of lubricating composition

Abstract

The invention discloses a gearbox lubricating composition for a high-speed motor train unit and a preparation method of the gearbox lubricating composition. The gearbox lubricating composition comprises the following components in parts by weight: 2.0-6.0 parts of an anti-scratch agent; 0.8 to 3.8 parts of an anti-wear reagent at extreme pressure; 0.5 to 2.8 parts of an antifriction additive; 0.1 to 0.5 part of an oxidation and corrosion inhibitor; 0.1 to 0.2 part of a metal deactivator; 0.05 to 0.25 part of an antirust agent; 0.01 to 0.06 part of an anti-foaming agent; 1-7 parts of a viscosity index improver; 4 to 16 parts of ester oil; 1 to 9 parts of HVIS150BS; and the balance of PAO6 and PAO40. The lubricating composition for the gearbox of the high-speed motor train unit has good scratch resistance, wear resistance, load bearing, friction reduction, corrosion resistance, rust prevention, foam resistance and thermal oxidation stability, especially has excellent temperature rise inhibition capability, and is suitable for lubricating the gearbox of the motor train unit with the speed of 450 kilometers per hour.

Description

Technical Field

[0001] The invention belongs to the technical field of lubricating oils, and in particular relates to a high-speed train gearbox lubricating composition and a preparation method thereof. Background Art

[0002] Gearboxes are the core unit of energy transmission in high-speed EMUs. After years of rapid development, domestic EMU gearbox R&D and manufacturing companies have mastered integrated gear transmission system design methods, lubrication and sealing, and temperature rise and vibration control technologies. They have mastered the manufacturing technology for gear transmission systems for Harmony EMUs operating at speeds of 160-350 km / h. These products have replaced imported products and strongly supported the strategy of achieving domestic production of key core components. To further enhance the international competitiveness of my country's rail transit equipment technology and achieve the goal of leading the world in the development of high-speed EMU gear transmission technology, it is necessary to overcome technical difficulties such as temperature rise and abnormal wear in high-speed rail gear transmission systems operating at speeds of 400 km / h and above.

[0003] As the lubricant for high-speed rail gearboxes, gear oil must not only prevent gear wear but also dissipate heat and reduce temperatures. As high-speed trains continue to increase in speed, the heat generated by gear meshing and oil agitation increases, leading to rising gear oil temperatures. Excessively high oil temperatures can trigger train protection devices, causing trains to slow down, disrupting normal traffic flow, and resulting in significant economic losses and adverse social impacts.

[0004] To meet the temperature-reducing requirements of high-speed rail gearboxes operating at 450 km / h, the kinematic viscosity of the lubricant needs to be lowered. While this helps reduce the temperature rise caused by high-speed agitation, it also introduces the risk of abnormal wear. Consequently, the content of extreme pressure anti-wear agents (EPA) needs to be increased, which in turn can lead to corrosion and thermal oxidative stability issues. Friction-reducing additives can also be added to reduce friction and suppress temperature rise, but these agents compete with EPA for surface adsorption, reducing their effectiveness. Addressing these issues requires a careful balance of additive types and dosages to meet the gearbox's lubrication needs. Summary of the Invention

[0005] In view of this, the present invention aims to provide a high-speed EMU gearbox lubricating composition and a preparation method thereof, so as to solve at least one technical problem in the background technology.

[0006] Compared with the existing technology, the high-speed EMU gearbox lubricating composition and its preparation method described in the present invention have the following advantages: while maintaining excellent anti-oxidation, anti-rust and anti-corrosion, extreme pressure and anti-wear, anti-foaming and other properties, it also has excellent temperature rise suppression effect. At the same speed level, it can reduce the temperature by up to 15°C compared with the existing Fuxing EMU gearbox lubricating oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] The accompanying drawings, which constitute part of the present invention, are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings: Figure 1 Graph showing the temperature rise suppression performance of Example 1 of the present invention and the comparative example. DETAILED DESCRIPTION

[0008] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0009] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0010] In the following examples, isobutylene sulfide was purchased from Shenyang Guangda Chemical Co., Ltd., code-named T321. Acidic phosphate amine salt was purchased from Shenyang Hualun Lubricant Additive Co., Ltd., code-named T308; anti-micropitting extreme pressure and anti-wear agent (homemade) was purchased from Shenyang Hualun Lubricant Additive Co., Ltd., code-named QT301; triphenyl thiophosphate was purchased from Jinzhou Shengda Chemical Co., Ltd., code-named T309; dialkyl dithiophosphoric acid derivatives were purchased from BASF, code-named IR353; and thiocarbamate was purchased from Shenyang Hualun Lubricant Additive Co., Ltd., code-named T323. Nitrogen-containing borate esters were purchased from Suzhou Jinmo Runcheng Lubrication Technology Co., Ltd., code GM1011; antimony dialkyl dithiophosphates were purchased from Vanderbilt, code V622; antimony dialkyl dithiocarbamates were purchased from Kelong Chemical Glass Instrument Supply Station, Weibin District, Baoji, code HL622; molybdenum dialkyl dithiophosphates were purchased from Luoyang Pacific United Petrochemical Co., Ltd., code POUPC1001; molybdenum dialkyl dithiocarbamates were purchased from Luoyang Pacific United Petrochemical Co., Ltd., code POUPC1002; molybdenum ammonium esters were purchased from Luoyang Pacific United Petrochemical Co., Ltd., code POUPC1003; glycerol hindered phenol was purchased from BASF, code FA10. Benzotriazole acid adducts were purchased from Shenyang Hualun Lubricant Additives Co., Ltd., code T406E; and thiadiazole derivatives were purchased from Luoyang Pacific United Petrochemical Co., Ltd., code POUPC6001-8. High-base calcium sulfonate was purchased from Xinxiang Ruifeng New Materials Co., Ltd., code RF1106D; low-base calcium sulfonate was purchased from Xinxiang Ruifeng New Materials Co., Ltd., code RF1104. A high-molecular-weight silicone derivative fast-acting defoamer was purchased from Luoyang Pacific United Petrochemical Co., Ltd., code HL-933S; a polysiloxane + ester derivative defoamer was purchased from Luoyang Pacific United Petrochemical Co., Ltd., code HL-933. A polymethacrylate viscosity index improver was purchased from Dalian Xinyiye New Materials Development Co., Ltd., code V6520. Pentaerythritol fatty acid ester was purchased from Croda Company, code 3970; PAO40 and PAO6 base oils were purchased from Mobil; and a Class I deeply refined mineral oil was purchased from Suzhou Zhuxin Industrial Lubricant Co., Ltd., code HVIS150BS.

[0011] The homemade QT301 process is as follows: 1) Take a 500ml three-necked flask, add a certain amount of phosphorus pentoxide to 100ml of petroleum ether (boiling range 90-120℃) solvent, and stir until it is evenly dispersed (about 3 minutes); 2) Add a certain amount of isooctyl alcohol dropwise using a dropping funnel while stirring. Keep the reaction temperature below 40°C during the addition. After the addition is complete, raise the temperature to 72-75°C and react for 4 hours to obtain the intermediate product (acidic phosphate). 3) After cooling the intermediate product, a certain amount of T152 (polyisobutylene bissuccinimide) and dodecylamine were added, and then the temperature was raised to 90-94°C and reacted for 3 hours; 4) After distilling off the petroleum ether solvent, QT301 is obtained.

[0012] Example 1 This embodiment provides a high-speed train gearbox lubricating composition and a preparation method thereof, the specific composition is as follows (in mass percentage): Anti-scuffing agent (T321) 3.35%, extreme pressure and anti-wear agent (QT301: T308: T309: T323, IR353=2:1:1:2:2.3) 1.66%, friction reducing additive (POUPC1002: HL622=1:1) 0.90%, metal deactivator (POUPC6001-8: T406E=1:2) 0.15%, antioxidant and anti-corrosion agent (RF2203) 0.2%, rust inhibitor (RF1106D) 0.05%, anti-foaming agent (HL933: HL933S=1:1) 0.02%, viscosity index improver (V6520) 5%, ester oil (3970) 9%, HVIS150BS 5%, PAO (PAO6 and PAO40) balance

[0013] The preparation method is as follows: The above raw materials are mixed (solid additives and a small amount of additives are added first, then a large amount of additives are added, and finally the base oil is added), heated to 66° C. and stirred for 1.5 hours to obtain the high-speed EMU gearbox lubricating composition.

[0014] Example 2 This embodiment provides a high-speed train gearbox lubricating composition and a preparation method thereof, the specific composition is as follows (in mass percentage): Anti-scuffing agent (T321) 3.35%, extreme pressure and anti-wear agent (QT301: T323: T308: T309: IR353=9:2:2:4:4.6) 2.16%, friction reducing additive (POUPC1002: POUPC1003: V622=4:2:5) 1.1%, metal deactivator (POUPC6001-8: T406E=5:8) 0.13%, rust inhibitor (RF1106D) 0.05%, anti-foaming agent (HL933: HL933S=1:1) 0.04%, viscosity index improver (V6520) 5%, ester oil (3970) 9%, HVIS150BS 5%, PAO (PAO6 and PAO40) balance

[0015] The preparation method is as in Example 1.

[0016] Implementation 3 This embodiment provides a gearbox oil composition with good temperature rise suppression effect, and its specific composition is as follows (in mass percentage): Anti-scuffing agent (T321) 3.6%, extreme pressure and anti-wear agent (QT301: T308: T309: IR353=9:7:4:4.6) 2.46%, friction reducing additive (POUPC1001: HL622=8:5) 1.30%, metal deactivator (T406E) 0.10%, antioxidant and anti-corrosion agent (RF2202) 0.3%, rust inhibitor (RF1104) 0.2%, anti-foaming agent (HL933) 0.03%, viscosity index improver (V6520) 5%, ester oil (3970) 9%, HVIS150BS 4%, PAO (PAO6 and PAO40) balance

[0017] The preparation method is as in Example 1.

[0018] To evaluate the performance of the present invention, a currently used high-speed rail gear oil was used as a comparative example. To demonstrate the present invention's excellent temperature rise suppression effect, a comparative example was prepared using other friction-reducing additives not within the scope of the present invention.

[0019] Comparative Example 1 Anti-scuffing agent (T321) 3.35%, extreme pressure and anti-wear agent (QT301: T308: T309: T323: IR353=2:1:1:2:2.3) 1.66%, friction reducing additive (GM1011: F10A=1:1) 0.90%, metal deactivator (POUPC6001-8: T406E=1:2) 0.15%, antioxidant and anti-corrosion agent (RF2203) 0.2%, rust inhibitor (RF1106D) 0.05%, anti-foaming agent (HL933: HL933S=1:1) 0.02%, viscosity index improver (V6520) 5%, ester oil (3970) 9%, HVIS150BS 5%, PAO (PAO6 and PAO40) balance

[0020] The preparation method is as in Example 1.

[0021] Comparative Example 2 Anti-scuffing agent (T321) 3.35%, extreme pressure and anti-wear agent (T308:T309:T323:IR353=3:1:2:2.3) 1.66%, friction reducing additive (GM1011:F10A=1:1) 0.90%, metal deactivator (POUPC6001-8:T406E=1:2) 0.15%, antioxidant and anti-corrosion agent (RF2203) 0.2%, rust inhibitor (RF1106D) 0.05%, anti-foaming agent (HL933:HL933S=1:1) 0.02%, viscosity index improver (V6520) 5%, ester oil (3970) 9%, HVIS150BS 5%, PAO (PAO6 and PAO40) balance

[0022] Preparation method reference example 1 Comparative Example 3 Anti-scuffing agent (T321) 3.35%, extreme pressure and anti-wear agent (QT301:T323:T309:IR353=3:1:2:2.3) 1.66%, friction reducing additive (GM1011:F10A=1:1) 0.90%, metal deactivator (POUPC6001-8:T406E=1:2) 0.15%, antioxidant and anti-corrosion agent (RF2203) 0.2%, rust inhibitor (RF1106D) 0.05%, anti-foaming agent (HL933:HL933S=1:1) 0.02%, viscosity index improver (V6520) 5%, ester oil (3970) 9%, HVIS150BS 5%, PAO (PAO6 and PAO40) balance

[0023] Preparation method reference example 1 Comparative Example 4 Anti-scuffing agent (T321) 3.35%, extreme pressure and anti-wear agent (QT301:T323:T308:IR353=3:1:2:2.3) 1.66%, friction reducing additive (GM1011:F10A=1:1) 0.90%, metal deactivator (POUPC6001-8:T406E=1:2) 0.15%, antioxidant and anti-corrosion agent (RF2203) 0.2%, rust inhibitor (RF1106D) 0.05%, anti-foaming agent (HL933:HL933S=1:1) 0.02%, viscosity index improver (V6520) 5%, ester oil (3970) 9%, HVIS150BS 5%, PAO (PAO6 and PAO40) balance

[0024] Preparation method reference example 1 Comparative Example 5 Anti-scuffing agent (T321) 3.35%, extreme pressure and anti-wear agent (QT301: T323: T308: T309: IR353=9:2:2:4:4.6) 2.16%, friction reducing additive (GM1011: POUPC1003=5:6) 1.1%, metal deactivator (POUPC6001-8, T406E) 0.13%, rust inhibitor (RF1106D) 0.05%, anti-foaming agent (HL933, HL933S) 0.04%, viscosity index improver (V6520) 5%, ester oil (3970) 9%, HVIS150BS 5%, PAO (PAO6 and PAO40) balance

[0025] The preparation method is as in Example 1.

[0026] Comparative Example 6 Anti-scuffing agent (T321) 3.35%, extreme pressure and anti-wear agent (QT301: T323: T308: T309: IR353=9:2:2:4:4.6) 2.16%, friction reducing additive (F10A: POUPC1003=5:6) 1.1%, metal deactivator (POUPC6001-8: T406E=5:8) 0.13%, rust inhibitor (RF1106D) 0.05%, anti-foaming agent (HL933: HL933S=1:1) 0.04%, viscosity index improver (V6520) 5%, ester oil (3970) 9%, HVIS150BS 5%, PAO (PAO6 and PAO40) balance

[0027] The preparation method is as in Example 1.

[0028] Comparative Example 7 Anti-scuffing agent (T321) 3.35%, extreme pressure and anti-wear agent (QT301: T323: T308: T309: IR353=9:2:2:4:4.6) 2.16%, friction reducing additive (POUPC1002: GM1011=5:6) 1.1%, metal deactivator (POUPC6001-8) 0.13%, rust inhibitor (RF1106D) 0.05%, anti-foaming agent (HL933: HL933S=1:1) 0.04%, viscosity index improver (V6520) 5%, ester oil (3970) 9%, HVIS150BS 5%, PAO (PAO6 and PAO40) balance

[0029] The preparation method is as in Example 1.

[0030] Comparison of main performances between the embodiment and the comparative example: The main properties of the embodiments and comparative examples were investigated, including anti-scratch, anti-wear, load-bearing, corrosion resistance, rust prevention, thermal oxidation stability and temperature rise suppression performance.

[0031] The temperature rise suppression test is carried out on a four-ball testing machine produced by Xiamen Tianji Automation Co., Ltd.: the room temperature is controlled between 23.2-23.5℃, the test oil is heated to 40℃ and then stopped, and then the test is started under a certain load and speed. When thermal equilibrium is reached and the temperature no longer rises (the temperature remains unchanged within 2 minutes), the test is stopped. The lower the thermal equilibrium temperature, the stronger the oil's ability to suppress temperature rise.

[0032] The thermal oxidation stability test was conducted using a self-developed method: 200 mL of test oil was added to a 250 mL beaker, and a No. 45 steel sheet (45 mm × 45 mm × 2 mm) was immersed in the test oil at an angle of about 30° to the bottom of the cup. The sheet was placed in an oven controlled at 135 °C for 72 h, and then the steel sheet was taken out and rinsed with petroleum ether. The discoloration of the steel sheet was observed, and the sediment at the bottom of the cup was observed at the same time. The steel sheet rating regulations are as follows: 0 means the steel sheet does not change color; 1 means slight discoloration, almost the same as a new sheet; 2 means partial light white; 3 means the steel sheet is light white, and the steel sheet is bright after wiping; 4 means red, yellow, blue, gray, etc., or there are gray-white sediments; 5 means partial gray-black, obvious corrosion; 6 means the steel sheet is gray-black and peeling. The sediment at the bottom of the cup is divided into many, medium, few, and none. The specific results are shown in Tables 1-2 and Figure 1 .

[0033] Table 1 Main properties of the implementation column and the current oil comparison example Table 2 Main performance of Example 1 and self-adjusting comparative example From the results in Table 1 and Table 2, it can be seen that the anti-wear performance and friction reduction performance of different comparative examples are lower than those of the examples, indicating that the lubricating oil composition of the present invention has good friction reduction and anti-wear performance and is suitable for lubrication of high-speed railway gearboxes with high speeds. In addition, the composition of the present invention has excellent thermal oxidation stability and a long service life.

[0034] from Figure 1 The results show that the embodiment has a better effect on suppressing temperature rise than the existing high iron oil control example and the self-adjustment control example.

[0035] Table 1-2 and Figure 1 The results show that the composition of the present invention has excellent anti-scratch, anti-wear, load-bearing, corrosion resistance, rust prevention, thermal oxidation stability and temperature rise suppression properties.

[0036] The composition of Example 1 showed good temperature rise suppression effect in the bench test of the high-speed railway gearbox at a speed of 400 kilometers per hour. Under room temperature of 34.2°C, the maximum bearing temperature in the 3-hour full-power test was 110°C (lower than the set alarm temperature of 120°C), and the temperature of the composition was 81.6°C.

[0037] In order to further illustrate the present invention, the compounding of the additives in the formula of Example 1 is described in detail.

[0038] Anti-scuffing agent (T321) 3.35%, extreme pressure and anti-wear agent (QT301: T308: T309: T323: IR353=2:1:1:2:2.3) 1.66%, friction reducing additive (POUPC1002: HL622=1:1) 0.90%, metal deactivator (POUPC6001-8: T406E=1:2) 0.15%, antioxidant and anti-corrosion agent (RF2203) 0.2%, rust inhibitor (RF1106D) 0.05%, anti-foaming agent (HL933: HL933S=1:1) 0.02%, viscosity index improver (V6520) 5%, ester oil (3970) 9%, HVIS150BS 5%, PAO (PAO6 and PAO40) balance

[0039] The good comprehensive performance of Example 1 is closely related to the additives and their combination. Anti-scuffing agent T321 has excellent anti-scuffing and anti-sintering capabilities, which can improve the oil P D value, can effectively protect gears under high load and impact load; among extreme pressure anti-wear agents, IR353 has excellent extreme pressure performance and anti-wear performance, and plays an important role in improving the oil P BWhile maintaining a high value, it can also provide good anti-wear performance. T308 is an acidic phosphate amine salt with high activity. It plays an anti-wear role under high temperature and high load, and also has a certain anti-rust effect. T309 has good extreme pressure anti-wear and thermal stability, which can improve the oil's load-bearing, anti-wear and antioxidant properties. QT301 has good anti-wear and sludge dispersibility, which can enhance the oil's anti-wear and antioxidant properties. T323 has good anti-wear and antioxidant properties, which can improve the oil's anti-wear and antioxidant properties. Among the friction-reducing additives, POUPC1002 is a molybdenum dialkyldithiocarbamate with excellent friction-reducing properties. It can reduce the friction coefficient of the oil, especially at 80-120°C. The temperature of the high-speed rail gearbox bearings during operation is usually required to be no higher than 120°C, which is within the temperature range where POUPC1002 has the best friction-reducing effect. Therefore, it can effectively suppress the temperature rise of the bearings. HL622 also has a good friction-reducing effect and has a good synergistic effect with POUPC1002, jointly playing the role of friction reduction and cooling. The metal deactivator T406E not only has excellent corrosion resistance and can effectively improve the oil's resistance to copper corrosion, but also has rust prevention and friction reduction effects. It is a multifunctional additive. POUPC6001-8 has good copper corrosion inhibition performance. When used with T406E, the copper sheet corrosion of the composition reaches level 1. The antioxidant and corrosion inhibitor RF2203 exhibits excellent synergy with POUPC1002, enhancing its anti-friction and anti-wear properties. The rust inhibitor RF1106D is an overbased calcium sulfonate, a detergent that also functions as a rust inhibitor, achieving excellent rust prevention. The anti-foaming agent HL933 exhibits excellent foam removal and suppression, with sustained stability, while HL933S exhibits rapid defoaming. The combination of these two anti-foaming agents effectively inhibits and rapidly eliminates foam. The viscosity index improver V6520 is a polymethacrylate with excellent shear resistance, improving the oil's viscosity-temperature performance without significantly decreasing its viscosity during use. The combination of ester oil 3970 and PAO addresses the poor solubility of additives in PAO base oils and improves compatibility with sealing materials. The addition of an appropriate amount of Class I deeply refined mineral oil HVIS150BS increases additive solubility, enhances oil film thickness and strength, and improves the oil's load-carrying capacity.

[0040] The applicant states that while the above-described embodiments illustrate a high-speed train gearbox lubricating composition and its preparation method, the present invention is not limited to these embodiments. This does not necessarily mean that the present invention must rely on these embodiments for implementation. Those skilled in the art will appreciate that any improvements to the present invention, equivalent substitutions for raw materials in the present invention, addition of auxiliary ingredients, and selection of specific methods, etc., fall within the scope of protection and disclosure of the present invention.

[0041] The preferred embodiments of the present invention are described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the scope of protection of the present invention.

[0042] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A high-speed train gearbox lubricating composition and a preparation method thereof, characterized by: In parts by weight: 2.0-6.0 parts of anti-abrasion agent; 0.8-3.8 parts of extreme pressure anti-wear agent; 0.5-2.8 parts of friction reducing additive; 0.1-0.5 parts of antioxidant and anticorrosive agent; 0.1-0.2 parts of metal deactivator; 0.05-0.25 parts of rust inhibitor; Antifoaming agent 0.01-0.06 parts; 1-7 parts of viscosity index improver; 4-16 parts of ester oil; HVIS150BS 1-9 parts; PAO6 and PAO40 remainder.

2. The high-speed train gearbox lubricating composition and preparation method thereof according to claim 1, characterized in that: In parts by weight: 2.2-4.2 parts of anti-abrasion agent; 1.2-3.2 parts of extreme pressure anti-wear agent; 0.5-2.2 parts of friction reducing additive; 0.2-0.4 parts of antioxidant and anticorrosive agent; 0.13-0.18 parts of metal deactivator; 0.05-0.20 parts of rust inhibitor; Antifoaming agent 0.01-0.04 parts; 2.0-6.5 parts of viscosity index improver; 6-13 parts of ester oil; HVIS150BS 2-8 parts; PAO40 and PAO6 margin.

3. A high-speed train gearbox lubricating composition and a preparation method thereof according to claim 1 or 2, characterized in that: The anti-scuffing agent is a sulphurised olefin.

4. A high-speed train gearbox lubricating composition and a preparation method thereof according to claim 1 or 2, characterized in that: The extreme pressure anti-wear agent includes one or more of acidic phosphate amine salts, anti-micropitting extreme pressure anti-wear agents, triphenyl thiophosphate, dialkyl dithiophosphate derivatives, and thiocarbamate.

5. A high-speed train gearbox lubricating composition and a preparation method thereof according to claim 1 or 2, characterized in that: The friction reducing additive includes one or more of non-sulfur phosphorus organic molybdenum, molybdenum dialkyl dithiophosphate, molybdenum dialkyl dithiocarbamate, antimony dialkyl dithiophosphate, and antimony dialkyl dithiocarbamate.

6. A high-speed train gearbox lubricating composition and a preparation method thereof according to claim 1 or 2, characterized in that: The antioxidant and anti-corrosion agent includes any one or two of thiophosphate butyl octyl zinc salt, thiophosphate dioctyl basic zinc salt, and thiophosphate primary and secondary alkyl zinc salt.

7. A high-speed train gearbox lubricating composition and a preparation method thereof according to claim 1 or 2, characterized in that: The metal deactivator includes one or more of benzotriazole derivatives and thiadiazole derivatives.

8. A high-speed train gearbox lubricating composition and a preparation method thereof according to claim 1 or 2, characterized in that: The rust inhibitor includes one or more of high-alkalinity calcium sulfonate, low-alkalinity calcium sulfonate, and neutral dinonylnaphthalene calcium sulfonate; And / or, the anti-foaming agent includes one or more of polysiloxane, ester derivatives, and high molecular weight organosilicon derivatives; And / or, the viscosity index improver is a polymethacrylate viscosity index improver having excellent shear resistance; And / or, the ester oil includes polyol ester and / or diester; the polyol ester includes one or both of pentaerythritol fatty acid ester and trimethylolpropane octanedioate; the diester includes one or both of diisononyl sebacate and diisodecyl adipate.

9. The method for preparing a high-speed train gearbox lubricating composition according to claim 1 or 2, characterized in that: The method comprises the following steps: mixing extreme pressure anti-wear agent, anti-scuffing agent, friction reducing additive, antioxidant and anti-corrosion agent, metal deactivator, rust inhibitor, anti-foaming agent and viscosity index improver, adding ester oil, HVIS150BS, PAO40 and PAO6, heating to 60-70°C and stirring for 1-2 hours.

10. The high-speed EMU gearbox lubricating composition prepared by the method for preparing the high-speed EMU gearbox lubricating composition according to claim 9 is used for lubricating the gearbox of a high-speed EMU with a speed of 450 kilometers per hour.

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