High-load motor train unit gearbox lubricating oil and preparation method thereof

Abstract

The application relates to the technical field of gear box lubricating oil research and development, and discloses high-load motor train unit gear box lubricating oil and a preparation method thereof, which comprises the following steps: preparing an organic ligand, the organic ligand being one of a mono-aldehyde ligand, a tri-aldehyde ligand and a tri-carboxyl pyrazole ligand; preparing MOF type material through coordination of the organic ligand and metal ions; modifying titanium dioxide particles modified by a silane coupling agent KH-540 by using the MOF type material based on a chemical bonding method to prepare a friction-reducing and wear-resistant agent; and adding the friction-reducing and wear-resistant agent into base oil to prepare the gear box lubricating oil. The application provides a method for preparing gear box lubricating oil, and accordingly, a gear box lubricating oil with excellent friction-reducing and wear-resistant effects is prepared, which can be applied to high-load motor train units.

Description

Technical Field

[0001] This invention relates to the field of gearbox lubricant research and development technology, specifically to a high-load EMU gearbox lubricant and its preparation method. Background Technology

[0002] The gearbox of a high-speed train is the core driving component of the train's power system. As an indispensable lubricating medium for the gearbox, gearbox lubricating oil is an important lubricant formulated with mineral oil or synthetic oil as the base oil and additives such as extreme pressure anti-wear agents and oiliness agents.

[0003] The lubricating oil for high-speed train gearboxes has excellent high and low temperature performance to ensure that the train can start and run normally under high temperature and low temperature conditions. On the other hand, it has excellent anti-wear and extreme pressure performance to ensure that the gears of the train do not experience abnormal wear when running at high speed and to ensure driving safety. Furthermore, it has good anti-oxidation performance to ensure that the train has a long driving range and oil change cycle.

[0004] In order to ensure that the gears of high-speed trains do not experience abnormal wear during high-speed operation, the development of gearbox lubricants with superior friction reduction and wear resistance capabilities based on existing gearbox lubricants has gradually become an inevitable trend in the industry.

[0005] When nanomaterials are used as lubricant additives, they can easily penetrate into the friction contact area to form a friction protective film. Furthermore, due to their high surface activity, nanomaterials can improve the stability of this protective film through physical or chemical adsorption, thereby preventing wear on the friction pair surfaces. For example, Chinese Patent Publication No. CN117965225A discloses a method for preparing a silica-graphene-carbon composite nano-lubricant. This method involves adding nano-silica and graphene-carbon nanoparticles to a base oil in a specific ratio to prepare a lubricant with excellent friction-reducing and anti-wear effects. Summary of the Invention

[0006] This invention provides a high-load high-speed train gearbox lubricating oil and its preparation method. By adding a self-developed nano-modifier to the base oil of the gearbox lubricating oil, the technical goal of improving the lubrication performance of the gearbox lubricating oil is achieved.

[0007] A method for preparing a high-load EMU gearbox lubricating oil includes the following steps:

[0008] Step 1: Preparation of friction-reducing and wear-resistant agent. The preparation method of the friction-reducing and wear-resistant agent is as follows: MOF-type nanomaterials are prepared by coordination between organic ligands and metal ions. The MOF-type nanomaterials are then used to modify titanium dioxide nanoparticles modified with silane coupling agent KH-540 through chemical bonding.

[0009] The organic ligand is a monoaldehyde ligand, and the chemical structural formula of the monoaldehyde ligand is as follows:

[0010] ;

[0011] Step 2: Prepare gearbox lubricating oil, which is made by uniformly mixing 95~99wt% base oil and 1~5wt% friction-reducing and anti-wear agent.

[0012] Preferably, the organic ligand is a trialdehyde ligand, and the chemical structural formula of the trialdehyde ligand is as follows:

[0013] .

[0014] Preferably, the organic ligand is a tricarboxypyrazole ligand, and the chemical structural formula of the tricarboxypyrazole ligand is as follows:

[0015] .

[0016] Preferably, the method for preparing the friction-reducing and wear-resistant agent is as follows:

[0017] Step S4-1: Utilizing the Suzuki coupling reaction mechanism, under alkaline conditions, palladium catalyst catalyzes the coupling reaction between 2-(4-bromophenyl)-4,6-diphenyl-1,3,5-triazine and 5-formylpyridine-3-boronic acid pinacol ester to generate a monoaldehyde ligand.

[0018] Step S4-2: Aldehyde-based MOF nanomaterials are prepared by coordinating a monoaldehyde ligand with a metal ion.

[0019] Step S4-3: Based on the Schiff base reaction mechanism, titanium dioxide nanoparticles modified with silane coupling agent KH-540 are modified with aldehyde-modified MOF nanomaterials to prepare a friction-reducing and wear-resistant agent.

[0020] Preferably, the method for preparing the friction-reducing and wear-resistant agent is as follows:

[0021] Step S5-1: Utilizing the Suzuki coupling reaction mechanism, under alkaline conditions, palladium catalyst catalyzes the coupling reaction between 2,4,6-tris-(4-bromophenyl)-[1,3,5]triazine and 5-formylpyridine-3-boronic acid pinacol ester to generate a trialdehyde ligand.

[0022] Step S5-2: Aldehyde-based MOF nanomaterials are prepared by coordinating trialdehyde ligands with metal ions.

[0023] Step S5-3: Based on the Schiff base reaction mechanism, titanium dioxide nanoparticles modified with silane coupling agent KH-540 are modified with aldehyde-modified MOF nanomaterials to prepare a friction-reducing and wear-resistant agent.

[0024] Preferably, the alkaline condition is one of potassium carbonate, sodium carbonate, cesium carbonate, and potassium phosphate;

[0025] Preferably, the palladium catalyst is one of palladium acetate, tris(dibenzylacetone)palladium, and tetra(triphenylphosphine)palladium.

[0026] Preferably, the method for preparing the friction-reducing and wear-resistant agent is as follows:

[0027] Step S7-1: Utilizing the Claisen condensation reaction mechanism, a basic catalyst catalyzes the condensation of 1,3,5-triazine-2,4,6-tricarboxylic acid triethyl ester containing α-H and 4-acetylpyridine to generate tris(diketonepyridyl) monomer;

[0028] Step S7-2: Utilizing the Knorr pyrazole synthesis reaction mechanism, an acidic catalyst catalyzes the cyclization reaction between the tris(diketopyridyl) monomer and p-carboxyphenylhydrazine to generate a tricarboxypyrazole ligand;

[0029] Step S7-3: Carboxylated MOF nanomaterials are prepared by coordinating tricarboxypyrazole ligands with metal ions.

[0030] Step S7-4: Based on the acylation reaction mechanism, the titanium dioxide nanoparticles modified with silane coupling agent KH-540 are modified with carboxylated MOF nanomaterials to prepare a friction-reducing and wear-resistant agent.

[0031] Preferably, the alkaline catalyst is sodium methoxide or sodium ethoxide;

[0032] Preferably, the acidic catalyst is formic acid or acetic acid.

[0033] Preferably, the metal ion is one of zinc ion, copper ion, silver ion, and manganese ion.

[0034] Preferably, the titanium dioxide nanoparticles have an outer diameter of 20-30 nm and a specific surface area >100 m². 2 / g;

[0035] Preferably, the base oil is a mineral oil or a synthetic oil.

[0036] Beneficial effects:

[0037] Based on molecular mechanisms, this invention designs and synthesizes monoaldehyde ligands, trialdehyde ligands, and tricarboxypyrazole ligands, which are then used to prepare MOF-type nanomaterials through coordination with metal ions.

[0038] A friction-reducing and anti-wear agent obtained by modifying titanium dioxide nanoparticles with MOF-type nanomaterials through chemical bonding was introduced as an additive into the base oil of gearbox lubricating oil to prepare a gearbox lubricating oil with excellent friction-reducing and anti-wear effects. Attached Figure Description

[0039] Figure 1 Performance test results of gearbox lubricating oil

[0040] Figure 2 Synthetic route for monoaldehyde ligands;

[0041] Figure 3 The chemical structural formula of the trialdehyde ligand;

[0042] Figure 4 The synthetic route for the tricarboxypyrazole ligand is shown. Detailed Implementation

[0043] Example 1:

[0044] Gearbox lubricating oil is prepared, which includes gearbox lubricating oils 1, 2, 3, 4 and 5, and their specific formulations are shown in Table 1.

[0045] Table 1. Gearbox Lubricating Oil Formulation

[0046] type Gearbox lubricant composition Gearbox lubricating oil 1 98.5wt% polyalphaolefin 6 synthetic oil + 1.5wt% titanium dioxide nanoparticles Gearbox lubricating oil 2 98.5wt% polyalphaolefin 6 synthetic oil + 1.5wt% titanium dioxide nanoparticles modified with silane coupling agent KH-540 Gearbox lubricating oil 3 98.5wt% Polyalphaolefin 6 synthetic oil + 1.5wt% Friction-reducing and anti-wear agent Gearbox lubricating oil 4 98.5wt% polyalphaolefin 6 synthetic oil + 1.5wt% friction reducer and anti-wear agent 2 Gearbox lubricating oil 5 98.5wt% polyalphaolefin 6 synthetic oil + 1.5wt% friction reducer and anti-wear agent 3

[0047] The preparation methods of titanium dioxide nanoparticles modified with silane coupling agent KH-540, friction-reducing and wear-resistant agent 1, friction-reducing and wear-resistant agent 2 and friction-reducing and wear-resistant agent 3 are described in the following examples;

[0048] The specific preparation steps of gearbox lubricating oil are as follows: Prepare the raw materials according to the formula in Table 1, use a homogenizer to stir at high speed for 20 minutes, and then place it in an ultrasonic oscillator for oscillation and dispersion for 30 minutes (ultrasonic power 50W, ultrasonic frequency 40KHz) to prepare gearbox lubricating oil.

[0049] The polyalphaolefin 6 synthetic oil was purchased from Shenzhen Huashengyuan Petroleum Technology Co., Ltd., and its specifications were: 100% purity and 0.83 g / cm³. 3 Viscosity index 138;

[0050] The basic parameters of titanium dioxide are: outer diameter 20~30nm, purity >98%, and specific surface area >100m². 2 / g, purchased from Maclin Reagent.

[0051] Performance testing:

[0052] The tribological properties of gearbox lubricating oil were tested using an MS-T3001 rotary friction and wear tester. The specific test steps are as follows: Using the MS-T3001 rotary friction and wear tester, the friction mode is ball-disc contact rotary friction. First, the friction contact surface is ultrasonically cleaned with alcohol. Then, the sample is dropped onto the friction contact surface, and the test begins (test conditions: ball-disc rotation speed 200 rpm, applied load 15 N, friction pair is steel ball and copper disk, the steel ball specification and material is GCr15 bearing steel with a diameter of 6 mm). The wear scar diameter and average friction coefficient are recorded.

[0053] The experimental results are shown in Table 2 below. Figure 1 .

[0054] Table 2. Performance test results of gearbox lubricating oil

[0055] Lubricating oil type Wear scar diameter (μm) Average coefficient of friction Gearbox lubricating oil 1 685 0.16 Gearbox lubricating oil 2 653 0.12 Gearbox lubricating oil 3 534 0.10 Gearbox lubricating oil 4 496 0.09 Gearbox lubricating oil 5 427 0.07 Polyalphaolefin 6 synthetic oil 712 0.15

[0056] A comprehensive analysis of the above experimental results leads to the following conclusions:

[0057] Adding titanium dioxide nanoparticles alone to modify polyalphaolefin 6 synthetic oil is not very effective. While titanium dioxide nanoparticles modified with silane coupling agents reduce the wear scar diameter and friction coefficient of polyalphaolefin 6 synthetic oil to some extent, the friction-reducing and anti-wear agent obtained by modifying titanium dioxide nanoparticles with MOF-type nanomaterials through chemical bonding has a significant beneficial effect on improving the friction and anti-wear properties of polyalphaolefin 6 synthetic oil.

[0058] Compared with the two aldehyde-modified MOF nanomaterials, the friction-reducing and anti-wear agent obtained by modifying titanium dioxide nanoparticles with carboxyl-modified MOF nanomaterials through chemical bonding has the best effect on improving the tribological properties of polyalphaolefin 6 synthetic oil.

[0059] Example 2:

[0060] Preparation of titanium dioxide nanoparticles modified with silane coupling agent KH-540: 5g of titanium dioxide nanoparticles, 10mL of deionized water and 40mL of anhydrous ethanol were added to a three-necked flask, stirred and dissolved at room temperature for 30min, and ultrasonically dispersed for 30min. Then, 10mL of KH540 silane coupling agent solution (prepared by 1g of KH540 silane coupling agent and 10mL of anhydrous ethanol) was added dropwise to the three-necked flask. The temperature was raised to 60℃ and stirred for 2h. The mixture was then filtered and dried under vacuum to obtain titanium dioxide nanoparticles modified with silane coupling agent KH-540.

[0061] Example 3:

[0062] The preparation steps for friction-reducing and anti-wear agent 1 are as follows:

[0063] (1) Preparation of monoaldehyde ligands, such as Figure 2 As shown, the preparation method is as follows: using the Suzuki coupling reaction mechanism, under alkaline conditions, palladium catalyst catalyzes the coupling reaction between 2-(4-bromophenyl)-4,6-diphenyl-1,3,5-triazine and 5-formylpyridine-3-boronic acid pinacol ester to generate a monoaldehyde ligand.

[0064] Among them, the alkaline condition is one of potassium carbonate, sodium carbonate, cesium carbonate, and potassium phosphate. Sodium carbonate was selected in this experimental example. The palladium catalyst is one of palladium acetate, tris(dibenzylacetone)dipalladium, and tetra(triphenylphosphine)palladium. Tetra(triphenylphosphine)palladium was selected in this experimental example.

[0065] The specific experimental steps for preparing the monoaldehyde ligand are as follows: 3.9 g of 2-(4-bromophenyl)-4,6-diphenyl-1,3,5-triazine, 2.3 g of 5-formylpyridine-3-borate pinacol ester, 1.5 g of anhydrous sodium carbonate, 60 mL of 1,4-dioxane, and 20 mL of deionized water were added to a three-necked flask. Under nitrogen protection and mechanical stirring, 10 mL of tetra(triphenylphosphine)palladium solution (prepared from 0.9 g of tetra(triphenylphosphine)palladium and 10 mL of 1,4-dioxane) was added to the three-necked flask. The mixture was heated to 95 °C and refluxed for 5 h. After cooling to room temperature, the mixture was poured into deionized water, washed with deionized water, extracted with dichloromethane, and dried with anhydrous sodium sulfate to obtain the monoaldehyde ligand.

[0066] The 1H NMR spectrum of the monoaldehyde ligand is characterized as follows: 1 H NMR (CDCl3, 400 MHz) δ: 7.36-7.61 (m, 10H), 8.10-8.35 (m, 5H), 8.93-9.01 (m, 2H), 9.42 (s, 1H);

[0067] (2) Preparation of aldehyde-based MOF nanomaterial I: The preparation method is as follows: Aldehyde-based MOF nanomaterial I is prepared by coordination reaction of a monoaldehyde ligand with zinc ions. The specific experimental steps are as follows: 3.9 g of zinc nitrate hexahydrate and 1.8 g of monoaldehyde ligand are dissolved in a mixed solution of 60 mL of N,N-dimethylformamide and 20 mL of deionized water, sealed in a Teflon-lined stainless steel high-pressure reactor, heated to 140 °C and kept at the temperature for 24 h, cooled to room temperature, centrifuged (8000 r / min for 15 min), washed with N,N-dimethylformamide and methanol in sequence, and vacuum dried to obtain aldehyde-based MOF nanomaterial I;

[0068] (3) Preparation of friction-reducing and anti-wear agent 1: Based on the Schiff base reaction mechanism, titanium dioxide nanoparticles modified with silane coupling agent KH-540 were modified by aldehyde-modified MOF nanomaterial I to prepare friction-reducing and anti-wear agent 1. The specific experimental steps are as follows: 5g of aldehyde-modified MOF nanomaterial I, 2g of titanium dioxide nanoparticles modified with silane coupling agent KH-540 and 100mL of N,N-dimethylformamide were added to a three-necked flask, ultrasonically dispersed for 30min, heated to 60℃ and stirred for 4h, cooled to room temperature, centrifuged (9000 r / min for 10min), washed with N,N-dimethylformamide and methanol in sequence, and vacuum dried to obtain friction-reducing and anti-wear agent 1.

[0069] Experiment Example 4:

[0070] The preparation steps for friction-reducing and anti-wear agent 2 are as follows:

[0071] (1) Preparation of trialdehyde ligands, the chemical structure of which is as follows: Figure 3 As shown, its preparation method is as follows: using the Suzuki coupling reaction mechanism, under alkaline conditions, palladium catalyst catalyzes the coupling reaction between 2,4,6-tris-(4-bromophenyl)-[1,3,5]triazine and 5-formylpyridine-3-boronic acid pinacol ester to generate a trialdehyde ligand;

[0072] Among them, the alkaline condition is one of potassium carbonate, sodium carbonate, cesium carbonate, and potassium phosphate. Sodium carbonate was selected in this experimental example. The palladium catalyst is one of palladium acetate, tris(dibenzylacetone)dipalladium, and tetra(triphenylphosphine)palladium. Tetra(triphenylphosphine)palladium was selected in this experimental example.

[0073] The specific experimental steps for preparing the trialdehyde ligand are as follows: 1.8 g of 2,4,6-tris-(4-bromophenyl)-[1,3,5]triazine, 2.3 g of 5-formylpyridine-3-borate pinacol ester, 3.2 g of anhydrous sodium carbonate, 60 mL of 1,4-dioxane, and 20 mL of deionized water were added to a three-necked flask. Under nitrogen protection and mechanical stirring, 20 mL of tetra(triphenylphosphine)palladium solution (prepared from 1.5 g of tetra(triphenylphosphine)palladium and 10 mL of 1,4-dioxane) was added to the three-necked flask. The mixture was heated to 95 °C and refluxed for 8 h. After cooling to room temperature, the mixture was poured into deionized water, washed with deionized water, extracted with dichloromethane, and dried with anhydrous sodium sulfate to obtain the trialdehyde ligand.

[0074] The 1H NMR spectrum characterization of the trialdehyde ligand is as follows: 1 H NMR (CDCl3, 400 MHz) δ: 7.48-7.65 (m, 12H), 8.29-8.31 (m, 3H), 8.86-8.90 (m, 6H), 9.45 (s, 3H);

[0075] (2) Preparation of aldehyde-modified MOF nanomaterial II: The preparation method is as follows: aldehyde-modified MOF nanomaterial II is prepared by coordination reaction between trialdehyde ligand and zinc ions. The specific experimental steps are the same as those of the preparation experiment of aldehyde-modified MOF nanomaterial I. The only difference is that trialdehyde ligand is used to replace monoaldehyde ligand.

[0076] (3) Preparation of friction-reducing and wear-resistant agent 2: Based on the Schiff base reaction mechanism, titanium dioxide nanoparticles modified by silane coupling agent KH-540 are modified by aldehyde-modified MOF nanomaterial II to prepare friction-reducing and wear-resistant agent 2. The specific experimental steps are the same as the preparation experiment of friction-reducing and wear-resistant agent 1. The difference is that aldehyde-modified MOF nanomaterial II is used to replace aldehyde-modified MOF nanomaterial I.

[0077] Experimental Example 5:

[0078] The preparation steps for friction-reducing and anti-wear agent 3 are as follows:

[0079] (1) Preparation of tricarboxypyrazole ligands, such as Figure 4 As shown, the preparation method steps are as follows:

[0080] Step 1: Utilizing the Claisen condensation mechanism, a basic catalyst catalyzes the condensation of 1,3,5-triazine-2,4,6-tricarboxylic acid triethyl ester containing α-H and 4-acetylpyridine to generate tris(diketonepyridyl) monomer;

[0081] The alkaline catalyst is either sodium methoxide or sodium ethoxide; sodium ethoxide was chosen for this experimental example.

[0082] Step 2: Utilizing the Knorr pyrazole synthesis reaction mechanism, an acidic catalyst catalyzes the cyclization reaction between the tris(diketopyridyl) monomer and p-carboxyphenylhydrazine to generate a tricarboxypyrazole ligand;

[0083] The acidic catalyst is either formic acid or acetic acid; acetic acid was chosen for this experimental example.

[0084] The specific experimental steps for preparing the tricarboxypyrazole ligand are as follows:

[0085] 1.0 g of triethyl 1,3,5-triazine-2,4,6-tricarboxylate, 0.9 g of sodium ethoxide, and 50 mL of anhydrous tetrahydrofuran were added to a three-necked flask. Under mechanical stirring, 20 mL of 4-acetylpyridine solution (prepared from 3.6 g of 4-acetylpyridine and 20 mL of anhydrous tetrahydrofuran) was added dropwise to the three-necked flask. The mixture was heated to 50 °C and stirred for 2 h. After cooling to room temperature, 40 mL of 0.5 mol / L hydrochloric acid was added. The mixture was extracted with dichloromethane, washed with saturated brine, dried over anhydrous magnesium sulfate, filtered, concentrated under reduced pressure, and dried under vacuum to obtain tris(diketopyridyl) monomer.

[0086] Under nitrogen protection and mechanical stirring, 1.8 g of tris(diketopyridyl) monomer and 20 mL of acetic acid were added to a three-necked flask and stirred at room temperature until completely dissolved. Then, 30 mL of p-carboxyphenylhydrazine solution (prepared by 3.6 g of p-carboxyphenylhydrazine and 30 mL of acetic acid) was added dropwise to the three-necked flask. The mixture was heated to 70 °C and stirred for 5 h. After cooling to room temperature, the mixture was filtered, washed with anhydrous ethanol, and dried under vacuum to obtain the tricarboxypyrazolyl ligand.

[0087] The proton NMR spectrum of the tricarboxypyrazole ligand is characterized as follows: 1 H NMR (CDCl3, 400 MHz) δ: 6.87 (s, 3H), 7.23-7.25 (m, 6H), 7.78-7.81 (m, 6H), 8.10-8.13 (m, 6H), 8.61-8.63 (m, 6H).

[0088] (2) Preparation of carboxylated MOF nanomaterials: The preparation method is as follows: carboxylated MOF nanomaterials are prepared by coordination reaction between tricarboxypyrazole ligand and zinc ions. The specific experimental steps are the same as those of the preparation experiment of aldehyde-modified MOF nanomaterial I. The only difference is that the single aldehyde ligand is replaced by tricarboxypyrazole ligand.

[0089] (3) Preparation of friction-reducing and anti-wear agent 3: Based on the acylation reaction mechanism, the titanium dioxide nanoparticles modified by silane coupling agent KH-540 were modified by carboxylated MOF nanomaterials to prepare friction-reducing and anti-wear agent 3. The specific experimental steps are as follows: 5g of carboxylated MOF nanomaterials, 2g of titanium dioxide nanoparticles modified by silane coupling agent KH-540 and 100mL of N,N-dimethylformamide were added to a three-necked flask with a water separator, ultrasonically dispersed for 30min, heated to 100℃ and stirred for 6h, cooled to room temperature, centrifuged (9000 r / min for 10min), washed with N,N-dimethylformamide and methanol in sequence, and vacuum dried to obtain friction-reducing and anti-wear agent 3.

Claims

1. A method of preparing a high load EMU gear box lubricating oil, characterized by, Comprise the following steps: Step one: preparation of friction reducing anti-wear agent, the preparation method of the friction reducing anti-wear agent is: MOF type nanometer material is prepared by the coordination of organic ligand and metal ion, and the MOF type nanometer material is used to modify the titanium dioxide nanoparticles modified by silane coupling agent KH-540 by chemical bonding method to prepare; The organic ligand is a monoaldehyde group ligand, and the chemical structural formula of the monoaldehyde group ligand is: ； Step two: preparation of gear box lubricating oil, the gear box lubricating oil is prepared by uniformly mixing 95-99wt% base oil and 1-5wt% friction reducing anti-wear agent.

2. The method of claim 1, wherein the high-load EMU gear box lubricating oil is prepared by adding 0.1 to 0.3 wt% of the compound of formula (1) to a base oil. The organic ligand is a tri-aldehyde group ligand, and the chemical structural formula of the tri-aldehyde group ligand is: 。 3. The method of claim 1, wherein the high-load EMU gear box lubricating oil is prepared by adding 0.1 to 0.3 wt% of the compound of formula (I) to a base oil. The organic ligand is a tri-aldehyde group ligand, and the chemical structural formula of the tri-aldehyde group ligand is: 。 4. The method of claim 1, wherein the high-load EMU gear box lubricating oil is prepared by adding 0.1 to 0.3 wt% of the compound of formula (I) to a base oil. The organic ligand is a tri-aldehyde group ligand, and the chemical structural formula of the tri-aldehyde group ligand is: The preparation method of the friction reducing anti-wear agent is: Step S4-1: under alkaline conditions, 2-(4-bromophenyl)-4,6-diphenyl-1,3,5-triazine and 5-formylpyridine-3-boronic acid pinacol ester are coupled by Suzuki coupling reaction mechanism, and palladium catalyst catalyzes to generate monoaldehyde group ligand; Step S4-2: the aldehyde group MOF type nanometer material is prepared by the coordination reaction of monoaldehyde group ligand and metal ion; 5. The method of claim 2, wherein the high-load EMU gear box lubricating oil is prepared by adding 0.1 to 0.3 wt% of the compound of formula (I) to a base oil. Step S4-3: based on the Schiff base reaction mechanism, the aldehyde group MOF type nanometer material is used to modify the titanium dioxide nanoparticles modified by silane coupling agent KH-540 to prepare the friction reducing anti-wear agent. The preparation method of the friction reducing anti-wear agent is: Step S5-1: under alkaline conditions, 2,4,6-tri-(4-bromophenyl)-[1,3,5] triazine and 5-formylpyridine-3-boronic acid pinacol ester are coupled by Suzuki coupling reaction mechanism, and palladium catalyst catalyzes to generate tri-aldehyde group ligand; Step S5-2: the aldehyde group MOF type nanometer material is prepared by the coordination reaction of tri-aldehyde group ligand and metal ion; 6. The method of preparing a high-load EMU gear box lubricating oil according to claim 4 or 5, characterized in that, Step S5-3: based on the Schiff base reaction mechanism, the aldehyde group MOF type nanometer material is used to modify the titanium dioxide nanoparticles modified by silane coupling agent KH-540 to prepare the friction reducing anti-wear agent. The alkaline condition is one of potassium carbonate, sodium carbonate, cesium carbonate and potassium phosphate; 7. The method of claim 3, wherein the high-load EMU gear box lubricating oil is prepared by adding 0.1 to 0.3 wt% of the compound of formula (I) to a base oil. The palladium catalyst is one of palladium acetate, tris(dibenzylideneacetone)dipalladium and tetrakis(triphenylphosphine)palladium. The preparation method of the friction reducing anti-wear agent is: Step S7-1: under alkaline conditions, 1,3,5-triazine-2,4,6-triethylate containing α-H and 4-acetylpyridine are condensed by Claisen condensation reaction mechanism, and base catalyst catalyzes to generate tri(diketopyridyl) monomer; Step S7-2: under acidic conditions, tri(diketopyridyl) monomer and p-carboxyphenylhydrazine are ring-closing reaction by Knorr pyrazole synthesis reaction mechanism, and acid catalyst catalyzes to generate tri-carboxy pyrazole ligand; Step S7-3: the carboxylated MOF type nanometer material is prepared by the coordination reaction of tri-carboxy pyrazole ligand and metal ion; Step S7-4: based on the acylation reaction mechanism, the titanium dioxide nanoparticles modified by silane coupling agent KH-540 are modified by using carboxylated MOF type nanomaterials to prepare the friction-reducing and wear-resistant agent.

8. The method of claim 7, wherein the high-load EMU gear box lubricating oil is prepared by adding 0.1 to 0.3 parts by weight of the compound of claim 1 to 100 parts by weight of a base oil. The basic catalyst is sodium methoxide or sodium ethoxide. The acidic catalyst is formic acid or acetic acid.

9. A process for preparing a high load EMU gear box lubricating oil according to any one of claims 1 to 5, characterized in that, The metal ion is one of zinc ion, copper ion, silver ion and manganese ion.

10. A process for preparing a high load EMU gear box lubricating oil as claimed in any one of claims 1 to 5, characterized in that, The titanium dioxide nanoparticles have an outer diameter of 20-30 nm, a specific surface area >100 m 2 / g; The base oil is mineral oil or synthetic oil.

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