Oil for gear processing and preparation method thereof

Abstract

The invention relates to the technical field of oil for gear processing, and discloses oil for gear processing and a preparation method thereof. Comprising the following operation steps: step 1, heating and stirring base oil to obtain pre-dissolved base oil for later use; heating and stirring the high-molecular oil-soluble polymer to obtain a pre-dissolved high-molecular oil-soluble polymer for later use; 2, stirring and circulating the pre-dissolved base oil, adding the pre-dissolved high-molecular oil-soluble polymer at the constant temperature of 50 + / -5 DEG C, stirring and circulating until a homogeneous phase, then adding the pre-dissolved base oil, and heating and stirring at the temperature of 60 + / -5 DEG C to obtain prefabricated processing oil; 3, every 10 minutes of stirring circulation, trimethylolpropane oleate, sulfurized fatty acid ester, sulfurized olefin, a composite additive, a nonionic demulsifier and a silicon-free defoaming agent are sequentially added into the prefabricated processing oil, the pre-dissolved base oil is added, and the gear processing oil is obtained.

Description

Technical Field

[0001] The invention relates to the technical field of processing oil, in particular to gear processing oil and a preparation method thereof. Background Art

[0002] Processing oil refers to multifunctional oils used for lubrication, cooling and cleaning in industrial production processes, especially in metal processing, machinery manufacturing, cutting, grinding, stamping and other processes. The use of processing oil plays a vital role in improving production efficiency, ensuring processing quality, extending tool life and reducing energy consumption. During the processing, cutting will generate a lot of heat, and processing oil can effectively take away this heat to avoid overheating of tools and workpieces, thereby ensuring the stability of the processing process. In high-speed and high-precision processing, the cooling effect is particularly important to prevent overheating from causing deformation of the workpiece, changes in hardness, and even damage to the equipment. Under high load conditions, it can maintain good lubricity, prevent direct contact between metal surfaces, and reduce wear.

[0003] In summary, it is of great significance to prepare a gear processing oil with extreme pressure and anti-wear properties. Summary of the invention

[0004] The object of the present invention is to provide a gear processing oil and a preparation method thereof to solve the problems raised in the prior art.

[0005] To achieve the above object, the present invention provides the following technical solutions: A gear processing oil, wherein the raw materials of the gear processing oil include the following components: by mass, 86-87 parts of base oil, 5-6 parts of trimethylolpropane oleate, 5-6 parts of sulfurized fatty acid ester, 2.5-3 parts of sulfurized olefin, 0.2-0.3 parts of high molecular oil-soluble polymer, 0.3-0.4 parts of composite additives, 0.05-0.06 parts of non-ionic demulsifier, and 0.03-0.04 parts of silicon-free defoamer.

[0006] Preferably, the viscosity of the base oil is 28-45 cSt@40°C, and the PB value of the gear processing oil is >2000.

[0007] A method for preparing gear processing oil comprises the following steps: Step 1: heat and stir the base oil to obtain a pre-dissolved base oil for standby use; heat and stir the high molecular oil-soluble polymer to obtain a pre-dissolved high molecular oil-soluble polymer for standby use; Step 2: Stir and circulate the pre-dissolved base oil, keep the temperature at 50±5°C, add the pre-dissolved high molecular oil-soluble polymer and stir and circulate until it becomes a uniform phase, then add the pre-dissolved base oil, heat and stir at 60±5°C to obtain the pre-processing oil; Step 3: After each stirring cycle of 10 minutes, trimethylolpropane oleate, sulfurized fatty acid ester, sulfurized olefin, composite additive, non-ionic demulsifier, silicon-free defoamer and pre-dissolved base oil are sequentially added to the prefabricated processing oil to obtain gear processing oil.

[0008] Preferably, the base oil is heated and stirred at a temperature of 60°C±5°C; and the high molecular weight oil-soluble polymer is heated and stirred at a temperature of 60°C±5°C.

[0009] More optimally, the composite additive is sulfided dialkyl dithiocarbamate oxymolybdenum and modified tungsten disulfide in a mass ratio of (1-2):1.

[0010] The preparation method of the modified tungsten disulfide is more optimized as follows: (1) adding thiolated tungsten disulfide to dichloromethane, ultrasonically dispersing, adding triethylamine and propylene oxide, and reflux at 37-40°C for 10-12 hours to obtain hydroxylated tungsten disulfide; (2) adding boric acid and N-tridecyldiethanolamine to toluene, performing water separation using a Dean-Stark trap at 110-115°C, cooling to room temperature, adding hydroxylated tungsten disulfide, mixing evenly, adding hydrochloric acid catalyst, heating to 130-135°C for reaction for 5-6 hours, adding 3-pyridazineboronic acid for reaction for 4-5 hours to obtain modified tungsten disulfide.

[0011] More optimally, the raw materials of the hydroxylated tungsten disulfide include the following components: by mass, 1-2 parts of thiolated tungsten disulfide, 3.5-3.7 parts of triethylamine, 2-2.2 parts of propylene oxide, and 30-35 parts of dichloromethane.

[0012] More optimally, the raw materials of the modified tungsten disulfide include the following components: by mass, 0.35-0.4 parts of boric acid, 2-2.5 parts of N-tridecyldiethanolamine, 0.5-0.7 parts of hydroxylated tungsten disulfide, 0.03-0.04 parts of hydrochloric acid catalyst, 2-3 parts of 3-pyridazineboric acid, and 40-50 parts of toluene.

[0013] Compared with the prior art, the invention has the following beneficial effects: the invention is a silicon-free processing oil with high extreme pressure value, good lubricity and long service life; the invention prepares the processing oil through high molecular oil-soluble polymer, base oil, trimethylolpropane oleate, sulfurized fatty acid ester, sulfurized olefin, composite additive, nonionic demulsifier and silicon-free defoamer.

[0014] Among them, trimethylolpropane oleate and sulfurized fatty acid esters are used to improve the lubricity of the oil, which can provide effective anti-wear protection under high load and high pressure conditions; sulfurized olefin is a sulfur-containing extreme pressure agent with high reactivity, which can reduce wear and prevent metal sintering on the metal surface of the friction pair; non-ionic demulsifiers and silicone-free defoamers can control the foam and moisture in the oil to ensure the stability and reliability of the oil; high molecular weight oil-soluble polymers maintain good fluidity and lubricity when the temperature changes; a thin film is formed on the metal surface to reduce friction and wear, thermal decomposition, and improve the low-temperature fluidity and high-temperature stability of the oil.

[0015] In the scheme, tungsten disulfide nanosheets are first thiolated and then reacted with propylene oxide to obtain hydroxylated tungsten disulfide; hydroxylated tungsten disulfide and N-tridecyldiethanolamine are chemically linked by boric acid, and the boric acid on 3-pyridazineboronic acid reacts with the remaining hydroxyl groups to obtain modified tungsten disulfide, which is beneficial to improving the dispersibility of tungsten disulfide nanosheets in base oil, and then it is mixed with sulfide dialkyl dithiocarbamate oxymolybdenum to obtain a composite additive.

[0016] Among them, sulfide dialkyl dithiocarbamate oxymolybdenum can form a protective film on the metal surface, provide effective lubrication protection under extremely high pressure, prevent direct contact between metal surfaces, and thus reduce wear and friction; and has good oxidation resistance, helping oil products to remain stable under high temperature and high load conditions; tungsten disulfide nanosheets are a layered material. Due to its low interlayer van der Waals force, under large load conditions, the relative sliding between friction pairs will be transferred to relative sliding between particle layers, thereby reducing friction. The van der Waals force and hydrogen bonding between long alkyl chains on N-tridecyl diethanolamine can improve the order and rigidity of the lubricating oil film, thereby improving the compression resistance of the lubricating film, thereby improving lubricity and extreme pressure properties. The nitrogen heterocyclic compound on 3-pyridazineboronic acid has a compact molecular structure, which gives it good thermal stability and excellent load-bearing capacity and lubricity. DETAILED DESCRIPTION

[0017] The following will be combined with the parts by mass in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0018] In the following specific embodiments, parts are by mass. In this embodiment, it should be noted that the purchase manufacturers of all raw materials involved in the present invention are not subject to any special restrictions, and exemplary examples include: base oil is HCR (hydrocracked base oil, Class II or Class III, CAS#64742-54-7, specific model is 150N (or 250N)), trimethylolpropane oleate model is KC-TM, sulfurized fatty acid ester model is KC-OL17, sulfurized olefin model is KC-OL40, non-ionic demulsifier model is KC-AR90, silicon-free defoamer model is KC- M4100, the model of sulfided dialkyl dithiocarbamate oxymolybdenum is KC-M5403, the model of tungsten disulfide nanosheets is SDDD, which are purchased from Yumu (Ningbo) New Materials Co., Ltd., the CAS number of γ-mercaptopropyltriethoxysilane is 14814-09-6, the CAS number of triethylamine is 121-44-8, the CAS number of propylene oxide is 75-56-9, the CAS number of boric acid is 10043-35-3, the CAS number of N-tridecyldiethanolamine is 68155-05-5, and the CAS number of 3-pyridazineboronic acid is 1175560-30-1.

[0019] The preparation method of thiolated tungsten disulfide is as follows: ultrasonically disperse 0.7 parts of tungsten disulfide nanosheets in 10 parts of ethanol aqueous solution (65wt%), add 2.2 parts of γ-mercaptopropyltriethoxysilane, react at 75°C for 12 hours, cool to room temperature, filter, wash and dry to obtain thiolated tungsten disulfide.

[0020] Example 1: A method for preparing gear processing oil; Step 1: (1) Add 1.3 parts of thiolated tungsten disulfide to 30 parts of dichloromethane, disperse by ultrasonication, add 3.5 parts of triethylamine and 2 parts of propylene oxide, and reflux at 40°C for 10 hours to obtain hydroxylated tungsten disulfide; (2) Add 0.4 parts of boric acid and 2 parts of N-tridecyl diethanolamine to 40 parts of toluene, separate water using a Dean-Stark trap at 110°C, cool to room temperature, add 0.5 parts of hydroxylated tungsten disulfide, mix evenly, add 0.03 parts of hydrochloric acid catalyst, heat to 130°C and react for 6 hours, add 2.2 parts of 3-pyridazineboronic acid and react for 4 hours to obtain modified tungsten disulfide; (3) uniformly mixing the sulfided dialkyl dithiocarbamate oxymolybdenum and the modified tungsten disulfide in a mass ratio of 2:1 to obtain a composite additive; (4) heating the base oil at 60° C. and stirring to obtain a pre-dissolved base oil for later use; heating the high molecular weight oil-soluble polymer at 60° C. and stirring for 1 hour to obtain a pre-dissolved high molecular weight oil-soluble polymer for later use; (5) adding the pre-dissolved base oil to the stirring kettle and stirring and circulating, heating to 50°C, maintaining the temperature, adding the pre-dissolved high molecular oil-soluble polymer and stirring and circulating for 10 minutes, adding the pre-dissolved base oil and stirring and circulating, heating to 60°C, and obtaining the prefabricated processing oil; Step 2: After each stirring cycle of 10 minutes, trimethylolpropane oleate, sulfurized fatty acid ester, sulfurized olefin, composite additive, nonionic demulsifier, silicon-free defoamer, and pre-dissolved base oil are sequentially added to the prefabricated processing oil, and samples are taken for testing. The mixture is cooled to 35±5°C, filtered, and filled to obtain gear processing oil. Among them, the raw materials of gear processing oil include the following components: by mass, 86.97 parts of base oil 150N, 6 parts of trimethylolpropane oleate, 6 parts of sulfurized fatty acid ester, 3 parts of sulfurized olefins, 0.3 parts of high molecular oil-soluble polymer, 0.4 parts of composite additives, 0.06 parts of non-ionic demulsifier, and 0.04 parts of silicone-free defoaming agent.

[0021] Example 2: A method for preparing gear processing oil; Step 1: (1) Add 1.3 parts of thiolated tungsten disulfide to 30 parts of dichloromethane, disperse by ultrasonication, add 3.5 parts of triethylamine and 2 parts of propylene oxide, and reflux at 40°C for 10 hours to obtain hydroxylated tungsten disulfide; (2) Add 0.4 parts of boric acid and 2 parts of N-tridecyl diethanolamine to 40 parts of toluene, separate water using a Dean-Stark trap at 110°C, cool to room temperature, add 0.5 parts of hydroxylated tungsten disulfide, mix evenly, add 0.03 parts of hydrochloric acid catalyst, heat to 130°C and react for 6 hours, add 2.2 parts of 3-pyridazineboronic acid and react for 4 hours to obtain modified tungsten disulfide; (3) uniformly mixing the sulfided dialkyl dithiocarbamate oxymolybdenum and the modified tungsten disulfide in a mass ratio of 1.2:1 to obtain a composite additive; (4) heating the base oil at 60° C. and stirring to obtain a pre-dissolved base oil for later use; heating the high molecular weight oil-soluble polymer at 60° C. and stirring for 1 hour to obtain a pre-dissolved high molecular weight oil-soluble polymer for later use; (5) adding the pre-dissolved base oil to the stirring kettle and stirring and circulating, heating to 50°C, maintaining the temperature, adding the pre-dissolved high molecular oil-soluble polymer and stirring and circulating for 10 minutes, adding the pre-dissolved base oil and stirring and circulating, heating to 60°C, and obtaining the prefabricated processing oil; Step 2: After each stirring cycle of 10 minutes, trimethylolpropane oleate, sulfurized fatty acid ester, sulfurized olefin, composite additive, nonionic demulsifier, silicon-free defoamer, and pre-dissolved base oil are sequentially added to the prefabricated processing oil, and samples are taken for testing. The mixture is cooled to 35±5°C, filtered, and filled to obtain gear processing oil. Among them, the raw materials of gear processing oil include the following components: by mass, 86.97 parts of base oil 150N, 5 parts of trimethylolpropane oleate, 5 parts of sulfurized fatty acid ester, 2.5 parts of sulfurized olefin, 0.2 parts of high molecular oil-soluble polymer, 0.3 parts of composite additives, 0.05 parts of non-ionic demulsifier, and 0.03 parts of silicone-free defoaming agent.

[0022] Embodiment 3: A method for preparing gear processing oil; Step 1: (1) Add 1.3 parts of thiolated tungsten disulfide to 30 parts of dichloromethane, disperse by ultrasonication, add 3.5 parts of triethylamine and 2 parts of propylene oxide, and reflux at 40°C for 10 hours to obtain hydroxylated tungsten disulfide; (2) Add 0.4 parts of boric acid and 2 parts of N-tridecyl diethanolamine to 40 parts of toluene, separate water using a Dean-Stark trap at 110°C, cool to room temperature, add 0.5 parts of hydroxylated tungsten disulfide, mix evenly, add 0.03 parts of hydrochloric acid catalyst, heat to 130°C and react for 6 hours, add 2.2 parts of 3-pyridazineboronic acid and react for 4 hours to obtain modified tungsten disulfide; (3) uniformly mixing the sulfided dialkyl dithiocarbamate oxymolybdenum and the modified tungsten disulfide in a mass ratio of 1.7:1 to obtain a composite additive; (4) heating the base oil at 60° C. and stirring to obtain a pre-dissolved base oil for later use; heating the high molecular weight oil-soluble polymer at 60° C. and stirring for 1 hour to obtain a pre-dissolved high molecular weight oil-soluble polymer for later use; (5) adding the pre-dissolved base oil to the stirring kettle and stirring and circulating, heating to 50°C, maintaining the temperature, adding the pre-dissolved high molecular oil-soluble polymer and stirring and circulating for 10 minutes, adding the pre-dissolved base oil and stirring and circulating, heating to 60°C, and obtaining the prefabricated processing oil; Step 2: After each stirring cycle of 10 minutes, trimethylolpropane oleate, sulfurized fatty acid ester, sulfurized olefin, composite additive, sulfurized dialkyl dithiocarbamate oxymolybdenum, non-ionic demulsifier, silicon-free defoamer, and pre-dissolved base oil are sequentially added to the prefabricated processing oil, and samples are taken for testing, cooled to 35±5°C, filtered and filled to obtain gear processing oil; Among them, the raw materials of gear processing oil include the following components: by mass, 86 parts of base oil 150N, 6 parts of trimethylolpropane oleate, 5 parts of sulfurized fatty acid ester, 2.5 parts of sulfurized olefin, 0.2 parts of high molecular oil-soluble polymer, 0.3 parts of composite additives, 0.05 parts of non-ionic demulsifier, and 0.04 parts of silicone-free defoaming agent.

[0023] Comparative Example 1 is based on Example 2, but modified tungsten disulfide is not added; Step 1: (1) heating and stirring the base oil at 60° C. to obtain a pre-dissolved base oil for later use; heating and stirring the high molecular weight oil-soluble polymer at 60° C. for 1 hour to obtain a pre-dissolved high molecular weight oil-soluble polymer for later use; (2) adding the pre-dissolved base oil into the stirring kettle, stirring and circulating, heating to 50°C, maintaining the temperature, adding the pre-dissolved high molecular oil-soluble polymer, stirring and circulating for 10 minutes, adding the pre-dissolved base oil, stirring and circulating, heating to 60°C, and obtaining the prefabricated processing oil; Step 2: After each stirring cycle of 10 minutes, trimethylolpropane oleate, sulfurized fatty acid ester, sulfurized olefin, sulfurized dialkyl dithiocarbamate oxymolybdenum, non-ionic demulsifier, silicon-free defoamer, and pre-dissolved base oil are sequentially added to the prefabricated processing oil, and samples are taken for testing. The mixture is cooled to 35±5°C, filtered and filled to obtain gear processing oil. Among them, the raw materials of gear processing oil include the following components: by mass, 86.97 parts of base oil 150N, 5 parts of trimethylolpropane oleate, 5 parts of sulfurized fatty acid ester, 2.5 parts of sulfurized olefin, 0.2 parts of high molecular oil-soluble polymer, 0.3 parts of sulfurized dialkyl dithiocarbamate oxymolybdenum, 0.05 parts of non-ionic demulsifier, and 0.03 parts of silicone-free defoamer.

[0024] Comparative Example 2 is based on Example 2, but no long chain is introduced into the modified tungsten disulfide; Step 1: (1) Add 1.3 parts of thiolated tungsten disulfide to 30 parts of dichloromethane, disperse by ultrasonication, add 3.5 parts of triethylamine and 2 parts of propylene oxide, and reflux at 40°C for 10 hours to obtain hydroxylated tungsten disulfide; (2) Add 0.4 parts of boric acid and 2 parts of N-tridecyl diethanolamine to 40 parts of toluene, separate water using a Dean-Stark trap at 110°C, cool to room temperature, add 0.5 parts of hydroxylated tungsten disulfide, mix evenly, add 0.03 parts of hydrochloric acid catalyst, heat to 130°C and react for 6 hours, add 2.2 parts of 3-pyridazineboronic acid and react for 4 hours to obtain modified tungsten disulfide; (3) uniformly mixing the sulfided dialkyl dithiocarbamate oxymolybdenum and the modified tungsten disulfide in a mass ratio of 1.2:1 to obtain a composite additive; (4) heating the base oil at 60° C. and stirring to obtain a pre-dissolved base oil for later use; heating the high molecular weight oil-soluble polymer at 60° C. and stirring for 1 hour to obtain a pre-dissolved high molecular weight oil-soluble polymer for later use; (5) adding the pre-dissolved base oil to the stirring kettle and stirring and circulating, heating to 50°C, maintaining the temperature, adding the pre-dissolved high molecular oil-soluble polymer and stirring and circulating for 10 minutes, adding the pre-dissolved base oil and stirring and circulating, heating to 60°C, and obtaining the prefabricated processing oil; Step 2: After each stirring cycle of 10 minutes, trimethylolpropane oleate, sulfurized fatty acid ester, sulfurized olefin, composite additive, nonionic demulsifier, silicon-free defoamer, and pre-dissolved base oil are sequentially added to the prefabricated processing oil, and samples are taken for testing. The mixture is cooled to 35±5°C, filtered, and filled to obtain gear processing oil. Among them, the raw materials of gear processing oil include the following components: by mass, 86.97 parts of base oil 150N, 5 parts of trimethylolpropane oleate, 5 parts of sulfurized fatty acid ester, 2.5 parts of sulfurized olefin, 0.2 parts of high molecular oil-soluble polymer, 0.3 parts of composite additives, 0.05 parts of non-ionic demulsifier, and 0.03 parts of silicone-free defoaming agent.

[0025] Comparative Example 3 is based on Example 2, but 3-pyridazine boronic acid is not introduced; Step 1: (1) Add 1.3 parts of thiolated tungsten disulfide to 30 parts of dichloromethane, disperse by ultrasonication, add 3.5 parts of triethylamine and 2 parts of propylene oxide, and reflux at 40°C for 10 hours to obtain hydroxylated tungsten disulfide; (2) Add 0.4 parts of boric acid and 2 parts of N-tridecyl diethanolamine to 40 parts of toluene, separate water using a Dean-Stark trap at 110°C, cool to room temperature, add 0.5 parts of hydroxylated tungsten disulfide, mix evenly, add 0.03 parts of hydrochloric acid catalyst, heat to 130°C and react for 6 hours to obtain modified tungsten disulfide; (3) uniformly mixing the sulfided dialkyl dithiocarbamate oxymolybdenum and the modified tungsten disulfide in a mass ratio of 1.2:1 to obtain a composite additive; (4) heating the base oil at 60° C. and stirring to obtain a pre-dissolved base oil for later use; heating the high molecular weight oil-soluble polymer at 60° C. and stirring for 1 hour to obtain a pre-dissolved high molecular weight oil-soluble polymer for later use; (5) adding the pre-dissolved base oil to the stirring kettle and stirring and circulating, heating to 50°C, maintaining the temperature, adding the pre-dissolved high molecular oil-soluble polymer and stirring and circulating for 10 minutes, adding the pre-dissolved base oil and stirring and circulating, heating to 60°C, and obtaining the prefabricated processing oil; Step 2: After each stirring cycle of 10 minutes, trimethylolpropane oleate, sulfurized fatty acid ester, sulfurized olefin, composite additive, nonionic demulsifier, silicon-free defoamer, and pre-dissolved base oil are sequentially added to the prefabricated processing oil, and samples are taken for testing. The mixture is cooled to 35±5°C, filtered, and filled to obtain gear processing oil. Among them, the raw materials of gear processing oil include the following components: by mass, 86.97 parts of base oil 150N, 5 parts of trimethylolpropane oleate, 5 parts of sulfurized fatty acid ester, 2.5 parts of sulfurized olefin, 0.2 parts of high molecular oil-soluble polymer, 0.3 parts of composite additives (the mass ratio of sulfurized dialkyl dithiocarbamate oxymolybdenum and modified tungsten disulfide is 3:1), 0.05 parts of non-ionic demulsifier, and 0.03 parts of silicone-free defoamer.

[0026] Testing experiment: According to the standard GB / 3142-2019, the P of Examples 1 to 3 and Comparative Examples 1 to 3 were evaluated. B Value (N), where the speed is 1450rev / min, the temperature is room temperature, and the test time is 10 s, as shown in Table 1; The friction performance of Examples 1 to 3 and Comparative Examples 1 to 3 was studied at a load of 300 N, a temperature of room temperature, a rotation speed of 1800 rev / min, and a time of 60 min, as shown in Table 1.

[0027] The indicators of each item of the detection example 2 are shown in Table 2.

[0028] Table 1

[0029] Conclusion: Comparative Example 1 is based on Example 2, but modified tungsten disulfide is not added; thus, the extreme pressure performance is reduced and the friction coefficient is increased. Comparative Example 2 is based on Example 2, but no long chain is introduced into the modified tungsten disulfide; thus, the extreme pressure performance is reduced, and the friction coefficient is increased because the viscosity is increased due to the lack of long chain. Comparative Example 3 is based on Example 2, but 3-pyridazineboronic acid is not introduced; thus, the extreme pressure and friction coefficient are reduced, because the nitrogen heterocyclic compound on 3-pyridazineboronic acid has a compact molecular structure, which makes it have good thermal stability and excellent load-bearing capacity and lubricity.

[0030] Table 2

[0031] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

Claims

1. A gear processing oil, characterized in that: The raw materials of the gear processing oil include the following components: by mass, 86-87 parts of base oil, 5-6 parts of trimethylolpropane oleate, 5-6 parts of sulfurized fatty acid ester, 2.5-3 parts of sulfurized olefin, 0.2-0.3 parts of high molecular oil-soluble polymer, 0.3-0.4 parts of composite additives, 0.05-0.06 parts of non-ionic demulsifier, and 0.03-0.04 parts of silicon-free defoamer.

2. The gear processing oil according to claim 1, characterized in that: The viscosity of the base oil is 28~45cSt@40℃, and the P of the gear processing oil is B Value > 2000.

3. The method for preparing a gear processing oil according to any one of claims 1 to 2, characterized in that: The steps include: Step 1: heat and stir the base oil to obtain a pre-dissolved base oil for standby use; heat and stir the high molecular oil-soluble polymer to obtain a pre-dissolved high molecular oil-soluble polymer for standby use; Step 2: Stir and circulate the pre-dissolved base oil, keep the temperature at 50±5°C, add the pre-dissolved high molecular oil-soluble polymer and stir and circulate until it becomes a uniform phase, then add the pre-dissolved base oil, heat and stir at 60±5°C to obtain the pre-processing oil; Step 3: After each stirring cycle of 10 minutes, trimethylolpropane oleate, sulfurized fatty acid ester, sulfurized olefin, composite additive, non-ionic demulsifier, silicon-free defoamer and pre-dissolved base oil are sequentially added to the prefabricated processing oil to obtain gear processing oil.

4. The method for preparing a gear processing oil according to claim 3, characterized in that: The temperature for heating and stirring the base oil is 60°C±5°C; the temperature for heating and stirring the high molecular oil-soluble polymer is 60±5°C.

5. The gear processing oil according to claim 2, characterized in that: The composite additive is sulfided dialkyl dithiocarbamate oxymolybdenum and modified tungsten disulfide in a mass ratio of (1-2):

1.

6. The method for preparing a gear processing oil according to claim 5, characterized in that: The preparation method of the modified tungsten disulfide is as follows: (1) adding thiolated tungsten disulfide to dichloromethane, ultrasonically dispersing, adding triethylamine and propylene oxide, and reflux at 37-40° C. for 10-12 hours to obtain hydroxylated tungsten disulfide; (2) adding boric acid and N-tridecyldiethanolamine to toluene, performing water separation using a Dean-Stark trap at 110-115° C., cooling to room temperature, adding hydroxylated tungsten disulfide, uniformly mixing, adding hydrochloric acid catalyst, heating to 130-135° C. for reaction for 5-6 hours, adding 3-pyridazineboronic acid for reaction for 4-5 hours to obtain modified tungsten disulfide.

7. The method for preparing a gear processing oil according to claim 6, characterized in that: The raw materials of the hydroxylated tungsten disulfide include the following components: by weight, 1-2 parts of mercaptolated tungsten disulfide, 3.5-3.7 parts of triethylamine, 2-2.2 parts of propylene oxide, and 30-35 parts of dichloromethane.

8. The method for preparing a gear processing oil according to claim 6, characterized in that: The raw materials of the modified tungsten disulfide include the following components: by mass, 0.35-0.4 parts of boric acid, 2-2.5 parts of N-tridecyldiethanolamine, 0.5-0.7 parts of hydroxylated tungsten disulfide, 0.03-0.04 parts of hydrochloric acid catalyst, 2-3 parts of 3-pyridazineboric acid, and 40-50 parts of toluene.

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