Platform type additive mother liquor for agricultural machinery multipurpose oil, agricultural machinery multipurpose oil and its application in agricultural machinery lubricating system

Abstract

This invention relates to the field of lubricating oil technology, and discloses a platform-type additive mother liquor for agricultural machinery multi-purpose oil, an agricultural machinery multi-purpose oil, and its application in agricultural machinery lubrication systems. The mother liquor comprises a wet braking friction control and noise reduction combination system, a high-speed and transient extreme pressure composite system, a low-speed and static protective film-forming system, a multi-cycle wear platforming film-forming promotion system, a water-content stabilization and rapid demulsification system, an anti-oxidation and rust / corrosion prevention system, an anti-foaming and degassing system, a cleaning and disassembly cleanliness control system, and a carrier base oil, and does not contain chlorine-containing extreme pressure agents. The agricultural machinery multi-purpose oil formulated with the mother liquor of this application balances friction stability, rapid demulsification, and filtration friendliness under water-content conditions, and can be formulated as one of UTTO, WUTTO, or BUTTO, serving as a common lubricating medium for agricultural machinery gearboxes, rear axles / final drives, hydraulic systems, and wet braking / wet clutch devices.

Description

Technical Field

[0001] This invention relates to the field of mechanical lubrication technology, and in particular to a platform-type additive mother liquor for agricultural machinery multipurpose oil, agricultural machinery multipurpose oil, and its application in agricultural machinery lubrication systems. Background Technology

[0002] Agricultural machinery widely adopts a design where the transmission system, hydraulic system, rear axle / final drive, and wet brakes share the same oil tank. Against this backdrop, UTTO (Universal Transmission Tolerant Oil), a multi-functional lubricant suitable for off-road agricultural machinery such as tractors, combine harvesters, and rice transplanters, has emerged. Existing UTTO products and related additive packages primarily aim to meet the basic technical specifications of OEMs, providing fundamental properties such as anti-wear, extreme pressure, rust prevention, corrosion prevention, and anti-foaming, while also considering, to some extent, the anti-whistling performance of wet braking systems and their tolerance to moisture.

[0003] However, in typical agricultural machinery operating conditions, existing UTTO products still have several prominent problems: 1. In paddy field operations, rainy or high-humidity environments, lubricating oil will inevitably mix with 0.1% to 0.5% or even higher levels of water. Some UTTO products only emphasize rapid demulsification performance, but do not systematically address issues that may occur when operating under conditions containing small amounts of water, such as viscosity fluctuations, rust prevention failure, and abnormal increases in filter element pressure differences due to emulsions or insoluble deposits, posing a risk of decreased lubrication reliability.

[0004] Second, the friction coefficient is often unstable during wet braking. Traditional formulas often rely on general-purpose friction modifiers, which can easily cause brake squealing, shaking, or low-temperature slippage, affecting the smoothness and safety of operation.

[0005] Third, agricultural machinery has obvious seasonal usage characteristics, often experiencing long-term storage of 3 to 12 months. Conventional UTTO products do not adequately consider "static protection" and "boundary lubrication during initial start-up," making them prone to dry friction scratches on metal surfaces when the oil film is lost, accompanied by abnormal noise and initial wear peaks.

[0006] Fourth, under conditions such as high-speed turning or sudden load increase in high-horsepower tractors and combine harvesters, the gear anti-galling and anti-pitting capabilities of some products under high-speed and transient impact loads are marginalized, and the protection is insufficient.

[0007] Fifth, under the working conditions of repeated cycles with water and high temperature, conventional lubricating oil formulas are prone to oxidation, forming varnish and sludge, causing hydraulic valve sticking, early filter blockage, and severe internal dirt during disassembly and maintenance, which increases after-sales maintenance costs.

[0008] In addition, existing technologies mostly optimize single-point performance such as noise reduction, wear resistance or water separation, lacking a unified platform-type additive mother liquor solution built around the common lubrication system of agricultural machinery, and even more so lacking system constraints on the specific compatibility boundaries of detergents, organophosphates, aqueous surfactants and defoaming / filtration.

[0009] Therefore, a new technical solution is urgently needed: on the basis of meeting the basic functional requirements of multi-purpose agricultural machinery oil, through platform-type additive mother liquor and its specific compatibility boundaries, to achieve a balance of frictional stability under water-containing conditions, rapid demulsification, filtration friendliness, first-start protection after long-term storage and multi-cycle wear control, while also having good industrial feasibility.

[0010] In view of this, the present invention is proposed. Summary of the Invention

[0011] The primary objective of this invention is to provide a platform-type additive mother liquor for multi-purpose agricultural machinery oils. This platform-type additive mother liquor is not a simple combination of several conventional lubricating oil additives, but rather constructed around specific compatibility boundaries of detergents, organophosphates, aqueous surfactants, and defoamers / filters. This allows multiple raw materials to coexist stably in the same mother liquor for extended periods, while also ensuring frictional stability under aqueous conditions, rapid demulsification, filtration friendliness, and restart protection after long-term storage.

[0012] A second objective of this invention is to provide a multi-purpose oil for agricultural machinery. The multi-purpose oil comprises a base oil and a platform-type additive stock solution, and can be formulated from the same stock solution platform into one of UTTO, WUTTO, or BUTTO.

[0013] The third objective of this invention is to provide the application of the multipurpose agricultural machinery oil formulated with the aforementioned platform-type additive mother liquor in agricultural machinery lubrication systems.

[0014] It should be noted that the platform-type additive mother liquor for agricultural machinery multi-purpose oil and the agricultural machinery multi-purpose oil provided by this invention can be monitored for their performance status using the three-channel fluorescence diagnostic enhancer disclosed in application number: 202610570553.3.

[0015] To achieve the above objectives, the present invention adopts the following technical solution: This invention provides a multi-purpose oil-based platform additive mother liquor for agricultural machinery, comprising, by total mass of the mother liquor: (a) 14% to 20% of wet brake friction control and noise reduction combination, wherein the wet brake friction control and noise reduction combination includes glyceryl monooleate, 2-ethylhexyl oleate and organophosphate components; (b) 10% to 14% of a high-speed and transient extreme pressure composite system, wherein the high-speed and transient extreme pressure composite system includes zinc dialkyl dithiophosphate, alkyl sulfide and / or isobutylene sulfide, and an organophosphate extreme pressure agent; (c) 8%–12% of a low-speed and static protective film-forming system, wherein the low-speed and static protective film-forming system includes polyisobutylene succinimide and isostearamide; (d) 6%–10% of a multi-cycle wear plateauing film-forming promoting system, wherein the multi-cycle wear plateauing film-forming promoting system includes boronized polyisobutylene succinimide; (e) 10% to 14% of an aqueous stabilized and rapidly demulsifying system, wherein the aqueous stabilized and rapidly demulsifying system comprises ethylene oxide-propylene oxide block copolymer ether; (f) Antioxidant and rust-preventive system 10% to 13%, wherein the antioxidant and rust-preventive system includes hindered phenolic antioxidant, aromatic amine antioxidant and dodecenyl succinate half ester rust inhibitor; (g) 2% to 3% of an antifoaming and degassing system, wherein the antifoaming and degassing system comprises polydimethylsiloxane and a polyether-type degassing agent; (h) The cleaning and disassembly cleanliness control system is 10% to 13%, and the cleaning and disassembly cleanliness control system includes polyisobutylene succinimide and calcium and / or magnesium detergents; (i) The carrier base oil is the balance; The mother liquor does not contain chlorine-containing extreme pressure agents; Furthermore, when the cleaning and disassembly cleanliness control system contains calcium and / or magnesium-based cleaning agents, the acid value of the organic phosphate component in the wet braking friction control and silent combination is ≤20 mg KOH / g, or the organic phosphate component is a C12-C14 alkyl phosphate diester diethanolamine salt with a neutralization degree ≥85%; the platform-type additive mother liquor remains single-phase homogeneous, without visible layering, precipitation or gelation after being circulated 3 times at -20℃ / 60℃ for 24 hours each time, and can be filtered through a 10-micron filter element.

[0016] Furthermore, the aqueous stabilizing and rapid demulsifying system also includes hexadecyl dimethyl betaine, wherein the hexadecyl dimethyl betaine accounts for 0-8% of the mass of the aqueous stabilizing and rapid demulsifying system; Furthermore, when the hexadecyl dimethyl betaine is present, the mass ratio of the ethylene oxide-propylene oxide block copolymer to the hexadecyl dimethyl betaine is 12:1 to 25:1.

[0017] Furthermore, the organophosphate component in the wet braking friction control and noise reduction combination is a C12-C14 alkyl phosphate diester diethanolamine salt; the calcium and / or magnesium detergent is selected from at least one of alkyl salicylate calcium, moderately alkaline calcium petroleum sulfonate and magnesium petroleum sulfonate.

[0018] Furthermore, the hexadecyl dimethyl betaine accounts for 5% of the mass percentage of the aqueous stable and rapid demulsification system, and the mass ratio of the ethylene oxide-propylene oxide block copolymer to the hexadecyl dimethyl betaine is 19:1; Furthermore, in the antifoaming and degassing system, the mass ratio of polydimethylsiloxane to polyether-type degassing agent is 5:95.

[0019] The present invention also provides a multi-purpose oil for agricultural machinery, comprising a base oil and the aforementioned platform-type additive mother liquor, wherein the platform-type additive mother liquor accounts for 8% to 12% of the total mass of the multi-purpose oil for agricultural machinery; after adding 0.3% by volume water and undergoing cyclic shearing, the multi-purpose oil for agricultural machinery exhibits a kinematic viscosity change rate of no more than ±5% at 40°C, and a demulsification performance at 54°C reaching 40 ml of oil phase, 40 ml of water phase, and 0 ml of emulsion layer within 10 minutes, and a friction coefficient stable at 0.10 to 0.16 in wet braking bench tests.

[0020] Furthermore, the multi-purpose agricultural machinery oil is one of UTTO, WUTTO, or BUTTO.

[0021] Furthermore, the base oil includes Group II and / or Group III mineral base oils, polyalphaolefin base oils, and / or pentaerythritol tetraisonononate; The kinematic viscosity of the base oil at 40°C is 4.0–8.0 mm² / s; The multi-purpose agricultural machinery oil also includes a viscosity index improver and / or a polymethyl methacrylate pour point depressant; the viscosity index improver accounts for 3% to 10% of the mass of the multi-purpose agricultural machinery oil; and the polymethyl methacrylate pour point depressant accounts for 0.05% to 0.5% of the mass of the multi-purpose agricultural machinery oil.

[0022] Furthermore, after adding 0.1% to 0.5% by volume water and undergoing cyclic shearing, the agricultural machinery multipurpose oil is tested for rust prevention performance according to GB / T 11143. Under distilled water and / or synthetic water conditions, the steel sample reaches the rust-free level, the filter element pressure difference increase does not exceed 10%, and no visible emulsified gel or blocky insoluble deposits are formed.

[0023] Furthermore, after being subjected to high temperature and high humidity cycling and static simulation for 90 days, the agricultural machinery multi-purpose oil does not exhibit a continuous whistling sound for more than 5 seconds during the first start-up, and there are no visible scratches or grooves on the metal contact surfaces. After the agricultural machinery multipurpose oil undergoes 5 wear-rest-re-wear cycles, the increase in wear scar diameter from the 3rd to the 5th cycle does not exceed 50% of the previous cycle, and the increase in wear scar diameter from the 5th cycle to the 1st cycle does not exceed 20%.

[0024] The present invention also provides the application of the agricultural machinery multipurpose oil in the lubrication system of agricultural machinery, wherein the agricultural machinery multipurpose oil is one of UTTO, WUTTO or BUTTO, and is used as a common lubricating medium for agricultural machinery gearboxes, rear axles / final drives, hydraulic systems and wet brake / wet clutch devices.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows: The technical effect of this invention does not stem from the simple superposition of several conventional additive modules, but rather from the synergistic control of detergents, organophosphates, aqueous surfactants, and defoaming / filtration boundaries. By synergistically defining the acid value or neutralization state of organophosphates in the presence of calcium and / or magnesium detergents, the addition window of hexadecyl dimethyl betaine, and the boundaries of antifoaming, degassing, and filtration, this invention reduces the risks of turbidity, precipitation, gelation, and deterioration of filterability in multi-system mother liquors, enabling platform-type additive mother liquors to maintain long-term single-phase stability and good storage stability and industrial feasibility.

[0026] The multi-purpose agricultural machinery oil formulated from the aforementioned platform-type additive mother liquor can simultaneously maintain friction stability, rapid demulsification, rust prevention, and filtration friendliness under conditions of wet braking, hydraulic transmission, and operation with water content. After adding 0.3% by volume water and undergoing cyclic shearing, the kinematic viscosity change rate at 40℃ does not exceed ±5%, and the demulsification performance at 54℃ reaches 40 ml of oil phase, 40 ml of water phase, and 0 ml of emulsion layer within 10 minutes. The coefficient of friction in the wet braking bench test is stable at 0.10–0.16. After adding 0.1%–0.5% by volume water and undergoing cyclic shearing, according to GB / T 11143, the rust prevention performance test shows that steel samples achieve a rust-free grade under distilled water and / or synthetic water conditions, the filter element pressure difference increase does not exceed 10%, and no visible emulsified gel or blocky insoluble deposits are formed.

[0027] Meanwhile, the platform-type additive mother liquor described in this invention can be used as a unified additive platform to formulate one of UTTO, WUTTO, or BUTTO, and maintains good performance in terms of first-start protection after long-term storage and multi-cycle wear control. After high-temperature and high-humidity cycling and 90-day static simulation, there is no whistling sound lasting more than 5 seconds during the first start, and there are no visible scratches or grooves on the metal contact surface; after 5 wear-static-re-wear cycles, the increase in wear scar diameter from the 3rd to the 5th cycle does not exceed 50% of the previous cycle, and the increase in wear scar diameter in the 5th cycle does not exceed 20% compared to the 1st cycle.

[0028] Furthermore, the platform-type additive mother liquor described in this invention does not contain chlorine-containing extreme pressure agents, which can reduce the risks of metal corrosion, sealing material deterioration, and environmental pollution that may be caused by traditional chlorine-containing additives. Therefore, this invention can provide a common lubrication medium solution for agricultural machinery gearboxes, rear axles / final drives, hydraulic systems, and wet braking / wet clutch devices. Detailed Implementation

[0029] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Unless otherwise specified, the term "compounding" in this application refers to physical compounding according to a preset mass ratio; the term "mass percentage" or "mass parts" refers to the mass percentage or mass parts of commercial raw materials; the raw materials can be commercial solutions or concentrates, and their active content can be 1% to 100%.

[0031] According to one aspect of the present invention, a platform-type additive mother liquor for agricultural machinery multi-purpose oil, comprising, by total mass of the mother liquor: (a) 14% to 20% of wet brake friction control and noise reduction combination, wherein the wet brake friction control and noise reduction combination comprises at least one of glyceryl monooleate, 2-ethylhexyl oleate and organophosphate components; (b) 10% to 14% of a high-speed and transient extreme pressure composite system, wherein the high-speed and transient extreme pressure composite system includes at least one of zinc dialkyl dithiophosphate, alkyl sulfide and / or isobutylene sulfide, and an organophosphate extreme pressure agent; (c) 8% to 12% of a low-speed and static protective film-forming system, wherein the low-speed and static protective film-forming system includes at least one of polyisobutylene succinimide and isostearamide; (d) 6%–10% of a multi-cycle wear plateauing film-forming promoting system, wherein the multi-cycle wear plateauing film-forming promoting system includes boronized polyisobutylene succinimide; (e) 10% to 14% of an aqueous stabilized and rapidly demulsifying system, wherein the aqueous stabilized and rapidly demulsifying system comprises ethylene oxide-propylene oxide block copolymer ether; (f) 10% to 13% of an antioxidant and rust-preventive system, wherein the antioxidant and rust-preventive system includes at least one of hindered phenolic antioxidants, aromatic amine antioxidants and dodecenyl succinate half-ester rust inhibitors; (g) 2% to 3% of an antifoaming and degassing system, wherein the antifoaming and degassing system includes at least one of polydimethylsiloxane and polyether-type degassing agent; (h) The cleaning and disassembly cleanliness control system is 10% to 13%, and the cleaning and disassembly cleanliness control system includes polyisobutylene succinimide and calcium and / or magnesium detergents; (i) The carrier base oil is the balance; The mother liquor does not contain chlorine-containing extreme pressure agents; the platform-type additive mother liquor remains single-phase homogeneous, without visible layering, precipitation or gel after being circulated three times at -20℃ / 60℃ for 24 hours each time, and can be filtered through a 10-micron filter element. The plateau-type additive mother liquor for multi-purpose agricultural machinery oil of this invention is obtained by compounding the above-mentioned wet braking friction control and noise reduction combination, high-speed and transient extreme pressure composite system, low-speed and static protection film-forming system, multi-cycle wear plateauing film-forming promotion system, water content stabilization and rapid demulsification system, anti-oxidation and rust prevention and corrosion prevention system, anti-foaming and degassing system, cleaning and disassembly cleanliness control system, and carrier base oil in a specific ratio. Verification has shown that it has the following beneficial effects: I. This invention reduces the risk of turbidity, precipitation, gelation, and deterioration of filterability when multiple systems coexist by synergistically defining specific compatibility boundaries between four types of components: detergent, organophosphate, aqueous surfactant, and defoamer / filter. The mother liquor remains a single-phase homogeneous solution after being circulated three times at -20℃ / 60℃ for 24 hours each time, with no visible layering, precipitation, or gelation, and can pass smoothly through a 10-micron filter element, demonstrating long-term storage stability and industrial feasibility.

[0032] II. The multi-purpose agricultural machinery oil formulated from the mother liquor of this invention achieves synergistic multi-performance under complex working conditions.

[0033] Under typical agricultural machinery operating conditions involving wet braking, hydraulic transmission, and water-containing operation, the aforementioned multi-purpose agricultural machinery oil can balance frictional stability, rapid demulsification, rust prevention, and filterability. After adding 0.3% by volume water and undergoing cyclic shearing, the kinematic viscosity change rate at 40℃ does not exceed ±5%, and the demulsification performance at 54℃ reaches 40 ml of oil phase, 40 ml of water phase, and 0 ml of emulsion layer within 10 minutes. The friction coefficient in the wet braking bench test is stable at 0.10 to 0.16. After adding 0.1% to 0.5% by volume of water and subjecting the sample to cyclic shearing, a rust prevention performance test is conducted according to GB / T 11143. The steel sample reaches a rust-free level under distilled water and / or synthetic water conditions, the pressure difference increase of the filter element does not exceed 10%, and no visible emulsified gel or blocky insoluble deposits are formed.

[0034] Third, the mother liquor of this invention serves as a unified platform to support the derivative applications of various types of agricultural machinery oils.

[0035] The platform-type additive mother liquor can be formulated into different types of multi-purpose agricultural machinery oils such as UTTO, WUTTO, and BUTTO by adjusting the base oil type and / or ratio, and maintains stable performance under long-term storage and multi-cycle wear scenarios. After 90 days of high temperature and high humidity cycling and static simulation, the first start-up did not produce a whistling sound lasting more than 5 seconds, and there were no visible scratches or grooves on the metal contact surface. After five wear-rest-re-wear cycles, the increase in wear scar diameter from the third to the fifth cycle did not exceed 50% of the previous cycle, and the increase in wear scar diameter from the fifth cycle to the first cycle did not exceed 20%.

[0036] IV. The mother liquor of this invention has the advantages of being environmentally friendly and material compatible: The platform-type additive mother liquor does not contain chlorine-containing extreme pressure agents, thus avoiding the risks of metal corrosion, rubber seal swelling or aging that may be caused by chlorine. It is suitable for lubrication system components of various materials in agricultural machinery.

[0037] It should be noted that this application does not address a single issue of anti-wear, noise reduction, or demulsification, but rather the compatibility issues arising from the coexistence of multiple components. When a system simultaneously contains calcium and / or magnesium detergents, organophosphate components, EO / PO polyethers, and hexadecyl dimethyl betaine, and further introduces organosilicon antifoaming / gas-releasing components, requiring the mother liquor to be stored as a single phase for extended periods, and the finished oil to not form a stable emulsion or gel under aqueous conditions while maintaining stable wet braking friction, turbidity, precipitation, reduced filterability, and friction fluctuations are likely to occur. This invention, by synergistically defining the acid value or neutralization state of organophosphates, the addition window of hexadecyl dimethyl betaine, and the defoaming / filtration boundary, alleviates the problems of unstable friction, poor emulsification and filterability of existing agricultural machinery shared lubrication system platform-type additive mother liquor under aqueous conditions, as well as the inability to simultaneously address initial start-up protection and multi-cycle wear control after long-term storage.

[0038] The core technology of this invention lies in using a platform-type additive mother liquor as a unified additive platform. By synergistically defining the specific compatibility boundaries between the detergent in the cleaning and disassembly cleanliness control system, the organophosphate ester component in the wet braking friction control and noise reduction combination, the surfactant component in the water-containing stability and rapid demulsification system, and the anti-foaming and degassing system and filtration conditions, the same mother liquor can not only exist stably in a single phase for a long time, but also be used to formulate multi-purpose agricultural machinery oils such as UTTO, WUTTO and BUTTO. It also takes into account friction stability, rapid demulsification, filtration friendliness, rust prevention and wear control under water-containing conditions, wet braking conditions and long-term parking and restart conditions.

[0039] In a preferred embodiment of the present invention, when the cleaning and disassembly cleaning control system contains calcium and / or magnesium-based cleaning agents, the acid value of the organic phosphate component in the wet braking friction control and silent combination is ≤20 mg KOH / g, or the organic phosphate component is a C12-C14 alkyl phosphate diethanolamine salt with a neutralization degree ≥85% (acid value ≤20 mg KOH / g, neutralization degree ≥85%). Preferably, the organic phosphate component is a C12-C14 alkyl phosphate diester diethanolamine salt.

[0040] In a preferred embodiment of the present invention, the aqueous stabilizing and rapid demulsifying system further includes hexadecyl dimethyl betaine, wherein the hexadecyl dimethyl betaine accounts for 0-8% of the mass percentage of the aqueous stabilizing and rapid demulsifying system; When the hexadecyl dimethyl betaine is present, the mass ratio of the ethylene oxide-propylene oxide block copolymer to the hexadecyl dimethyl betaine is 12:1 to 25:1.

[0041] In a preferred embodiment of the present invention, the organic phosphate component in the wet braking friction control and noise reduction combination is a C12-C14 alkyl phosphate diester diethanolamine salt. Furthermore, the calcium and / or magnesium cleaning agent in the cleaning and disassembly cleanliness control system is selected from at least one of alkyl salicylate calcium, moderately alkaline calcium petroleum sulfonate and magnesium petroleum sulfonate.

[0042] In a preferred embodiment of the present invention, the amphoteric surfactant is alkyl betaine, preferably hexadecyl dimethyl betaine; Preferably, the hexadecyl dimethyl betaine accounts for 5% of the mass percentage of the aqueous stable and rapid demulsification system, and the mass ratio of the ethylene oxide-propylene oxide block copolymer to the hexadecyl dimethyl betaine is 19:1.

[0043] In a preferred embodiment of the present invention, the mass ratio of polydimethylsiloxane to polyether-type gas release agent in the antifoaming and gas release system is 5:95.

[0044] Preferably, the platform-type additive mother liquor of the present invention can be prepared as follows: The carrier base oil is added to a container equipped with a stirring device, and the temperature is raised to 50°C–60°C under nitrogen protection. The raw materials of each functional system are added sequentially and stirred continuously for 1.0–2.0 hours until the system is clear and homogeneous, thus obtaining the platform-type additive mother liquor. For single raw materials with poor low-temperature fluidity or high melting points, they can be pre-dissolved in base oil or pentaerythritol tetraisonononate before being added.

[0045] In summary, to avoid turbidity, precipitation, gelation, deterioration of filterability, or fluctuations in wet braking friction when multiple raw materials coexist, the mother liquor of the platform-type additive of this invention preferably meets the following compatibility boundaries: (1) When the cleaning and disassembly cleaning control system contains calcium and / or magnesium cleaning agents, the organic phosphate ester component in the wet brake friction control and silent combination is preferably a neutral or low acid value variety with an acid value not higher than 20 mg KOH / g, or a C12-C14 alkyl phosphate diester diethanolamine salt with a neutralization degree not lower than 85% (acid value ≤ 20 mg KOH / g, neutralization degree ≥ 85%). (2) Cetyl dimethyl betaine in the water-stable and rapid demulsification system is an optional component, and preferably controlled at 0 to 8% of the mass of the system; preferably, the mass ratio of ethylene oxide-propylene oxide block copolymer ether to cetyl dimethyl betaine is 12:1 to 25:1, more preferably 19:1; (3) In the anti-foaming and gas release system, the mass ratio of polydimethylsiloxane to polyether-type gas release agent is preferably 5:95, so as to balance foam suppression, air release and filtration. (4) After the platform-type additive mother liquor is circulated at -20℃ / 60℃ 3 times, 24 hours each time, it preferably still maintains a single phase uniformity, without visible layering, precipitation or gel, and can be filtered through a 10-micron filter element.

[0046] According to one aspect of the present invention, a multi-purpose oil for agricultural machinery comprises a base oil and the aforementioned platform-type additive mother liquor, wherein the platform-type additive mother liquor accounts for 8% to 12% of the total mass of the multi-purpose oil for agricultural machinery; The multi-purpose agricultural machinery oil, after adding 0.3% by volume water and undergoing cyclic shearing, exhibits a kinematic viscosity change rate of no more than ±5% at 40℃; its demulsification performance at 54℃ reaches 40 ml of oil phase, 40 ml of water phase, and 0 ml of emulsion layer within 10 minutes; and its friction coefficient remains stable at 0.10–0.16 during wet braking bench tests.

[0047] In a preferred embodiment of the present invention, the multipurpose agricultural machinery oil is one of UTTO, WUTTO and BUTTO, and is used as a common lubricating medium for agricultural machinery gearboxes, rear axles / final drives, hydraulic systems and wet brake / wet clutch devices.

[0048] In a preferred embodiment of the present invention, the base oil includes at least one of Group II and / or Group III mineral base oils, polyalphaolefin base oils, and / or pentaerythritol tetraisonononate. The kinematic viscosity of the base oil at 40°C is 4.0–8.0 mm² / s; Preferably, the pentaerythritol tetraisonononate is a polyol ester; The multi-purpose oil for agricultural machinery also includes viscosity index improvers and polymethyl methacrylate pour point depressants; Preferably, the viscosity index improver accounts for 3% to 10% of the mass of the agricultural machinery multipurpose oil; Preferably, the polymethacrylate pour point depressant accounts for 0.05% to 0.5% of the mass of the agricultural machinery multipurpose oil.

[0049] Preferably, the multi-purpose agricultural machinery oil can be prepared as follows: first, mix the base oil and heat it to 50℃~60℃, add a viscosity index improver under stirring and allow it to fully swell, then add a platform-type additive mother liquor and continue stirring until it is uniform and clear, then add a polymethyl methacrylate pour point depressant, stir for 30 minutes and cool, and filter it through a 10-micron filter element to obtain the multi-purpose agricultural machinery oil.

[0050] In a preferred embodiment of the present invention, after adding 0.1% to 0.5% water and cyclically shearing, a rust prevention performance test is conducted according to GB / T 11143. The steel sample reaches the rust-free level, the filter element pressure difference increase does not exceed 10%, and no visible emulsified gel or blocky insoluble deposits are formed.

[0051] In a preferred embodiment of the present invention, after the agricultural machinery multipurpose oil has been subjected to high temperature and high humidity cycling and static simulation for 90 days, it does not produce a whistling sound that lasts for more than 5 seconds during the first start-up, and there are no visible scratches or grooves on the metal contact surface. After the agricultural machinery multipurpose oil undergoes 5 wear-rest-re-wear cycles, the increase in wear scar diameter from the 3rd to the 5th cycle does not exceed 50% of the previous cycle, and the increase in wear scar diameter from the 5th cycle to the 1st cycle does not exceed 20%.

[0052] Preferably, the multi-purpose agricultural machinery oil of the present invention simultaneously meets the following performance indicators: (1) After adding 0.3% by volume water and undergoing cyclic shearing, the change rate of kinematic viscosity at 40℃ does not exceed ±5%; (2) The demulsification performance at 54℃ reached 40 ml of oil phase, 40 ml of water phase, and 0 ml of emulsion layer within 10 minutes; (3) The coefficient of friction in the wet braking test bench test was stable at 0.10 to 0.16; (4) After adding 0.1% to 0.5% water and cyclic shearing, the rust prevention performance test shall be carried out in accordance with GB / T 11143. The steel sample shall reach the rust-free level, the filter element pressure difference increase shall not exceed 10%, and no visible emulsified gel or blocky insoluble deposit shall be formed. (5) After high temperature and high humidity cycling and static simulation for 90 days, the first start-up does not produce a continuous whistling sound for more than 5 seconds, and there are no visible scratches or grooves on the metal contact surface; after 5 wear-static-re-wear cycles, the increase in wear scar diameter from the 3rd to the 5th cycle does not exceed 50% of the previous cycle, and the increase in wear scar diameter from the 5th cycle to the 1st cycle does not exceed 20%.

[0053] According to one aspect of the present invention, the above-mentioned platform-type additive mother liquor or the above-mentioned agricultural machinery multi-purpose oil is used in the lubrication system of agricultural machinery.

[0054] The platform-type additive mother liquor or the multi-purpose agricultural machinery oil provided by the present invention can be widely used in agricultural machinery lubrication systems.

[0055] The technical solution of the present invention will be further described below with reference to the embodiments.

[0056] Note: The experimental detection methods used in the various embodiments of this application are as follows: Kinematic viscosity: determined according to GB / T 265; Viscosity index: Calculated according to the method specified in GB / T 1995; Pour point: determined according to GB / T 3535; Flash point (open cup): determined according to GB / T 3536; Moisture content: determined according to GB / T 7600; Mechanical impurities: determined according to GB / T 511; Foam properties: determined according to GB / T 12579; Air release value: determined according to GB / T 7304; Demulsification performance: determined according to GB / T 7305; Rust resistance of steel sheets: determined according to GB / T 11143; Copper strip corrosion resistance: determined according to GB / T 5096; FZG gear anti-galling test: determined according to the corresponding standard method; Wet braking friction performance and squealing behavior: Evaluated with reference to JASO M347, JASO M349 standards or the company’s internal bench test methods; Water content stability performance: According to the company's internal test plan, 0.1% to 0.5% water was added to the sample, and after cyclic shearing, the change rate of kinematic viscosity at 40℃, the rust prevention performance of the steel sheet, the deposition of insoluble matter, and the change of filter element pressure difference were evaluated. Initial start-up wear peak: The sample was first placed at 50℃ and 95% relative humidity for 72 hours, and then left to stand at 25℃ for 90 days; then it was started at 1200 rpm and 392 Newtons for 60 seconds, and the peak friction torque, peak vibration and / or peak wear scar diameter were recorded during the start-up phase, and the rate of change was calculated based on the control oil. Wear-rest-rewear cycle test: Five cycles were performed under the same test piece, same load and same lubrication supply conditions; each wear cycle lasted 30 minutes and rested for 24 hours. The diameter or volume wear of the wear scar in each cycle was recorded, and the increase of the nth cycle relative to the (n-1)th cycle was used to evaluate whether it tended to plateau. Storage / filtration performance evaluation: The mother liquor was circulated at -20℃ / 60℃ 3 times, and the appearance changes were observed after 24 hours each time. The filtration performance and whether clogging occurred were evaluated using a 10-micron filter element under a pressure difference of 0.10 MPa.

[0057] Example 1 This embodiment provides a platform-type additive mother liquor A1. Based on the total mass of the mother liquor, the platform-type additive mother liquor A1 consists of the following functional systems, as detailed in Table 1.

[0058] Table 1. Functional system composition of platform-type additive mother liquor A1:

[0059] Note: The "Compound Mass Ratio within the System" in Table 1 corresponds to the order of the "Raw Material Name" column; each mass fraction is the mass fraction of the commercial raw material.

[0060] The preparation method of platform-type additive mother liquor A1 in this embodiment includes: Add the carrier base oil to a mixing vessel equipped with a stirrer, and heat to 50℃~60℃ under nitrogen protection; while stirring continuously, add in sequence: glyceryl monooleate, 2-ethylhexyl oleate, and C12~C14 alkyl phosphate diethanolamine salt (acid value ≤20 mg). The following ingredients were added: KOH / g (neutralization degree ≥85%), zinc dialkyl dithiophosphate (ZDDP), alkyl naphthalene sulfide, tris(2-ethylhexyl) phosphate, polyisobutylene succinimide (PIBSI), isostearamide, boronized polyisobutylene succinimide, ethylene oxide-propylene oxide block copolymer ether, 2,6-di-tert-butyl-4-methylphenol, dinonyldiphenylamine, dodecenyl succinate half-ester, polyisobutylene succinimide, and moderately basic alkyl salicylate calcium. The mixture was stirred for 1.0–1.5 hours until the liquid was homogeneous and clear. Finally, polydimethylsiloxane and ethylene oxide-propylene oxide block copolymer ether degassing agent were added, and the mixture was stirred for another 0.5 hours until the system was homogeneous and clear, thus obtaining the platform-type additive mother liquor A1.

[0061] The resulting mother liquor A1 is a uniform, transparent to slightly pale single-phase liquid. After being circulated three times at -20℃ / 60℃ for 24 hours each time, there is still no visible layering, precipitation or gel, and it can be filtered through a 10-micron filter element.

[0062] Example 2 This embodiment provides a platform-type additive mother liquor A2 as one of the modified implementations of the platform-type mother liquor.

[0063] Compared to Example 1, the main difference in this example is that magnesium petroleum sulfonate is used in the cleaning and disassembly cleanliness control system to examine the compatibility stability of the platform mother liquor under magnesium petroleum sulfonate conditions. The remaining functional systems still maintain the platform-type mother liquor framework defined in this invention, as detailed in Table 2.

[0064] Table 2 Functional system composition of platform-type additive mother liquor A2:

[0065] Note: The "component mass ratio within the system" in Table 2 corresponds to the order of the "raw material name" column; each mass fraction is the mass fraction of the commercial raw material.

[0066] The preparation method is the same as in Example 1.

[0067] The resulting mother liquor A2, while maintaining single-phase stability, can be used to subsequently formulate multi-purpose agricultural machinery oil characterized by magnesium petroleum sulfonate as a detergent.

[0068] Example 3: Composition and preparation of platform-type additive mother liquor A3 This embodiment provides a platform-type additive mother liquor A3, as another preferred embodiment of the platform-type mother liquor.

[0069] Compared to Example 1, the main difference in this example is that a controlled amount of hexadecyl dimethyl betaine is further introduced into the water-stable and rapid demulsification system to investigate the effect of ethylene oxide-propylene oxide block copolymer ether and hexadecyl dimethyl betaine at a mass ratio of 95:5 on the storage stability of the mother liquor and the water-content operation stability of the finished oil. See Table 3 for details.

[0070] Table 3: Functional system composition of platform-type additive mother liquor A3:

[0071] Note: The "Compound Mass Ratio within the System" in Table 3 corresponds to the order of the "Raw Material Name" column; each mass fraction is the mass fraction of the commercial raw material.

[0072] The preparation method is the same as in Example 1, wherein hexadecyl dimethyl betaine is an optional component, accounting for 5% of the mass of the water-stable and rapid demulsification system, in order to avoid the formation of stable emulsions.

[0073] The resulting mother liquor A3, while maintaining the single-phase stability of the mother liquor, can be further used to formulate agricultural machinery multipurpose oil containing a controlled amount of hexadecyl dimethyl betaine.

[0074] Example 4: Agricultural Machinery Multipurpose Oil (UTTO) In this embodiment, the platform-type additive mother liquor A1 obtained in Example 1 is used as the additive system to formulate a multi-purpose agricultural machinery oil (UTTO), which is suitable for the common lubrication of gearboxes, rear axles / final drives, hydraulic systems and wet brake / wet clutch devices of large agricultural machinery such as tractors and combine harvesters.

[0075] 1. Base oil formulation (percentage by mass): Group II base oils (kinematic viscosity at 40°C 5.0~6.0mm² / s) 55.0%; Group II base oil (kinematic viscosity at 40°C 9.0~10.0mm² / s) 10.0%; Polyalphaolefin (PAO6) 8.0%; Polyol ester (108A) 10.3%; Platform-type additive mother liquor A1 10.0%; Ethylene-propylene copolymer viscosity index improver (Jilin Chemical 0010) 6.5%; Polymethyl methacrylate pour point depressant (1-248) 0.2%.

[0076] 2. Preparation of finished oil products: The above base oils were mixed and heated to 50℃~60℃. Ethylene-propylene copolymer viscosity index improver (Jihua 0010) was added under stirring, and the mixture was stirred and swollen at 50℃~60℃ for 1.5~2.0 hours. Then, platform-type additive mother liquor A1 was added and stirred and mixed at 60℃ for 1 hour. Finally, polymethyl methacrylate pour point depressant (1-248) was added, stirred for 30 minutes, cooled, and filtered through a 10-micron filter element to obtain agricultural machinery multi-purpose oil A (UTTO).

[0077] 3. The main physicochemical properties of the multi-purpose agricultural machinery oil A in this embodiment, as tested, are as follows: The kinematic viscosity at 40℃ is 60±0.5mm² / s; the kinematic viscosity at 100℃ is approximately 10.5mm² / s; the viscosity index is approximately 170; the pour point is not higher than -30℃; the flash point (open cup) is not lower than 220℃; the anti-adhesion grade in the FZG gear anti-adhesion test is not lower than grade 12; the foam volume at each stage of foaming meets the limit and basically disappears within 10 minutes; the demulsification performance at 54℃ reaches 40 ml of oil phase, 40 ml of water phase, and 0 ml of emulsion layer within 10 minutes. According to GB / T 11143, the rust prevention performance test was conducted, and the steel samples reached the rust-free level under both distilled water and synthetic water conditions. The corrosion rating of copper sheet at 100℃ for 3 hours is no worse than Grade 1.

[0078] 4. Performance evaluation results: (1) Wet braking test: Under the specified wet braking test bench conditions, the friction coefficient was stable at 0.10 to 0.16, no whistling sound lasting more than 5 seconds occurred throughout the test, and no obvious slippage or dragging was observed.

[0079] (2) Water-containing operation stability: After adding 0.3% water by volume to the oil sample and cyclically shearing it, the change rate of kinematic viscosity at 40℃ does not exceed ±5%; according to GB / T 11143, the rust prevention performance test is carried out, and the steel sample reaches the rust-free level; the pressure difference of the filter element does not exceed 10%, and no visible emulsified gel or blocky insoluble deposits are formed.

[0080] (3) Long-term storage and disassembly simulation: After 90 days of high temperature and high humidity cycling and static simulation, the first start-up does not produce a continuous whistling sound for more than 5 seconds, and there are no visible scratches or grooves on the metal contact surface; during disassembly, the tooth surface and the inner wall of the shell are only slightly colored, and no continuous dense thick paint film or block carbon deposits are seen. The valve hole remains unobstructed, and the deposits on the filter element surface are loose and can be wiped off.

[0081] (4) Multi-cycle wear trend: Five wear-rest-re-wear simulation tests were conducted. The results showed that the wear scar diameter increased by no more than 50% of the previous one during the third to fifth cycles, and the wear scar diameter in the fifth cycle increased by no more than 20% compared with the first cycle.

[0082] Example 5: Agricultural Machinery Multipurpose Oil (UTTO, Cost-Balanced Type) To meet the needs of different OEMs for a balance between cost and performance, this embodiment is still based on the platform-type additive mother liquor technology route to formulate a cost-balanced agricultural machinery multipurpose oil (UTTO).

[0083] Mother liquor adjustment (mother liquor B1): Mother liquor B1 uses the same platform mother liquor framework as mother liquor A1 in Example 1. However, in order to reduce costs and take into account cleanliness and filtration friendliness, the proportions of each functional system are further optimized. The alkyl salicylate calcium in the cleaning and disassembly cleanliness control system is adjusted to medium-alkaline calcium petroleum sulfonate to take into account cost, cleanliness and filtration friendliness. See Table 4 for details.

[0084] Table 4. Functional system composition of cost-balanced platform additive mother liquor B1:

[0085] Note: The "component mass ratio within the system" in Table 4 corresponds to the order of the "raw material name" column; each mass fraction is the mass fraction of the commercial raw material.

[0086] The amount of mother liquor B1 added to the finished oil is 10.0%. Except that the platform additive mother liquor is replaced by B1 instead of A1, the other base oils, viscosity index improvers, polymethyl methacrylate pour point depressants and blending processes are the same as in Example 4.

[0087] Performance: The multi-purpose agricultural machinery oil obtained in this embodiment reduces costs while still meeting the basic performance requirements of a common lubrication system for agricultural machinery: after adding 0.3% by volume water and undergoing cyclic shearing, the kinematic viscosity change rate at 40℃ does not exceed ±5%; the demulsification performance at 54℃ reaches 40 ml of oil phase, 40 ml of water phase, and 0 ml of emulsion layer within 10 minutes; the coefficient of friction in the wet brake bench test is stable at 0.10–0.16, and no whistling occurs for more than 5 seconds. This embodiment is suitable for application scenarios that require certain comprehensive performance and emphasize cost control.

[0088] Example 6: Multipurpose Oil for Agricultural Machinery (WUTTO) To meet the needs of agricultural machinery in frigid regions operating in low-temperature environments, this embodiment further formulates the platform-type additive mother liquor of the present invention into a winter-grade multipurpose agricultural machinery oil (WUTTO). The composition of the platform-type additive mother liquor B1 used in the WUTTO is shown in Table 4.

[0089] The composition of WUTTO by mass percentage is as follows, see Table 5 for details.

[0090] Table 5: Composition of WUTTO

[0091] The method for preparing multipurpose agricultural machinery oil in this embodiment includes: mixing base oil and heating it to 50℃~60℃, adding a viscosity index improver under stirring and allowing it to fully swell, then sequentially adding platform-type additive mother liquor B1 and polymethyl methacrylate pour point depressant, stirring until clear and uniform, cooling, and filtering through a 10-micron filter element to obtain the WUTTO product.

[0092] The resulting WUTTO products have a pour point no higher than -35°C and meet the requirements for low-temperature torque in wet braking, air release, and demulsification.

[0093] Example 7: Agricultural Machinery Multipurpose Oil (BUTTO) This embodiment prepares a biodegradable multipurpose agricultural machinery oil (BUTTO). The product uses a base oil system that meets biodegradation requirements and takes into account the comprehensive performance of wet braking and hydraulic transmission. The composition of the platform-type additive mother liquor A3 used in the BUTTO is shown in Table 3.

[0094] The components of BUTTO in this embodiment, by mass percentage, are as follows, see Table 6 for details.

[0095] Table 6: Composition of BUTTO

[0096] The preparation method of the multi-purpose oil for agricultural machinery in this embodiment includes: mixing pentaerythritol tetraoctanoate (biodegradable) with polyalphaolefin (PAO6) and heating to 50℃~60℃, adding a viscosity index improver under stirring and allowing it to swell fully, then adding platform-type additive mother liquor A3 and polymethyl methacrylate pour point depressant, stirring until uniform and clear, cooling, and filtering through a 10-micron filter element to obtain the BUTTO product.

[0097] The resulting BUTTO product has a pour point not higher than -40℃ and meets the requirements for wet braking friction characteristics, water content stability and demulsification.

[0098] To further illustrate the differences between the technical solution of this invention and conventionally disclosed UTTO concepts and out-of-bounds formulations, the following comparative examples are provided. Except as otherwise stated in Comparative Example 1, Comparative Examples 2-7 are based on the base oil system, viscosity index improver, polymethyl methacrylate pour point depressant, total amount of mother liquor added, and finished oil blending process used in Example 4. Except for explicitly stated differences, all other conditions remain consistent.

[0099] Comparative Example 1 This comparative example selects a typical publicly available UTTO formulation as the comparison object. The formulation uses the combination of specific raw materials listed in Table 7. The composition is as follows by mass percentage, as detailed in Table 7.

[0100] Table 7: Comparison of Oil C

[0101] The method for preparing the comparative oil C provided in this comparative example includes: 1. Mix Group III base oil, Group II base oil, polyalphaolefin (PAO6) and pentaerythritol tetraisonononate and heat to 50℃~60℃.

[0102] 2. Under stirring conditions, add zinc dialkyl dithiophosphate, isobutylene extreme pressure agent, -52, medium-alkaline calcium petroleum sulfonate, polyisobutylene succinimide, 2,6-di-tert-butyl-4-methylphenol, dinonyldiphenylamine, glyceryl monooleate, dodecenyl succinate half ester rust inhibitor, polyoxyethylene-polyoxypropylene block copolymer ether and polydimethylsiloxane in sequence, and stir at a constant temperature until clear and uniform.

[0103] 3. After cooling and filtration through a 10-micron filter element, control oil C is obtained.

[0104] Experimental results: (1) Under normal working conditions, the kinematic viscosity of oil C at 40℃ is about 59.2 mm² / s, the kinematic viscosity at 100℃ is about 10.3 mm² / s, the viscosity index is about 165, the pour point is about -34℃, and the flash point (open cup) is about 218℃, which can meet the basic viscosity grade and some basic physicochemical index requirements. (2) In the wet braking bench test, the average friction coefficient of the control oil C was about 0.12, the friction coefficient range was about 0.07 to 0.20, the fluctuation range was about 0.13, there was a sharp whistling sound that lasted for about 11 seconds, and about 4 local slippages occurred in 30 braking cycles, and the friction response was obviously unstable. (3) Compared with Example 4, Comparative oil C showed poor adaptability to complex operating conditions under common lubrication conditions, and its smoothness of operation decreased significantly. The comparison results of Example 4 and Comparative Example 1 in terms of wet braking response and basic physicochemical indicators are shown in Table 8 and Table 9, respectively.

[0105] Table 8 Comparison of wet braking response between Example 4 and Comparative Example 1:

[0106] Table 9 Comparison of basic physicochemical properties between Example 4 and Comparative Example 1:

[0107] Conclusion: Comparative Example 1 shows that although the typical publicly disclosed UTTO comparative oil prepared using the specific raw material combination shown in Table 7 can meet some basic physicochemical indicators, it is difficult to maintain stable friction response and good running smoothness under wet braking conditions. This indicates that the technical effect of the present invention cannot be naturally obtained by simply superimposing conventional UTTO components.

[0108] Comparative Example 2: Oil D without low-speed and static protective film-forming systems This comparative example is used to investigate the effect of low-speed and static protective film-forming systems on the first start-up protection after long-term storage. To ensure that the comparison variable is singular, based on the mother liquor A1 obtained in Example 1, only the low-speed and static protective film-forming systems were removed, and the missing parts were made up with carrier base oil; the raw material names, compounding mass ratios and mass parts of the other functional systems were kept consistent with Table 1, resulting in mother liquor D1, as shown in Table 10.

[0109] Table 10: Functional System Composition of Mother Liquor D1

[0110] Note: The "Compound Mass Ratio within the System" in Table 10 correspond to the order of the "Raw Material Name" column; each mass fraction is the mass fraction of the commercial raw material.

[0111] The preparation method of the comparative oil D provided in this comparative example includes: mixing base oils and heating to 50℃~60℃, adding a viscosity index improver under stirring and allowing it to swell fully, then adding mother liquor D1 and stirring until uniform and clear, then adding polymethyl methacrylate pour point depressant, cooling and filtering through a 10-micron filter element to obtain comparative oil D.

[0112] Experimental results: (1) Under normal operating conditions, the comparison oil D can still maintain its basic viscosity and some extreme pressure anti-wear properties; (2) After 90 days of high temperature and high humidity cycling and static simulation, the first start-up stage showed a significant increase in wear peak and vibration. (3) Slight scratches and grooves are visible on the metal contact surface, and the protection during the first start-up is significantly weaker than that in Example 4.

[0113] Conclusion: Comparative Example 2 shows that, with the remaining functional systems remaining the same as in Example 1, and only the low-speed and static protective film-forming systems removed, the first-start protection after long-term storage is significantly reduced. This indicates that the first-start protection is not a natural byproduct of general antioxidant or rust-preventive systems, but depends on the synergistic effect of the low-speed and static protective film-forming systems and other functional systems.

[0114] Comparative Example 3: Oil E without a water-stabilized and rapid demulsification system This comparative example was used to investigate the effect of the water-stable and rapid demulsification systems on the stability of water-saturated operations. Based on the mother liquor A1 obtained in Example 1, the ethylene oxide-propylene oxide block copolymer ether in the water-stable and rapid demulsification system was removed, and the missing parts were made up with carrier base oil; the amounts of base oil, viscosity index improver, polymethyl methacrylate pour point depressant, and total mother liquor added were kept consistent with those in Example 4, resulting in control oil E.

[0115] Experimental results: (1) After adding 0.3% by volume water to the comparative sample and subjecting it to cyclic shearing, the kinematic viscosity change rate at 40℃ was +12.4%; (2) It takes about 18 minutes for demulsification at 54℃ to reach 39 ml of oil phase, 39 ml of water phase, and 2 ml of emulsion layer; (3) The steel sheet showed pitted corrosion under distilled water conditions and obvious corrosion under synthetic water conditions; (4) The pressure difference of the filter element increased by 38%, and emulsified flocculent matter and a small amount of blocky insoluble deposits were visible in the sample.

[0116] Conclusion: Comparative Example 3 shows that "stable operation with low water content" is not a natural property of conventional UTTO systems, but depends on the synergy between water-stable and rapid demulsification systems and other functional systems.

[0117] Comparative Example 4: Comparative oil F using common acidic organophosphates. This comparative example is used to examine the compatibility boundary between the detergent and the organophosphate. The remaining modules are the same as in Example 4, except that the C12-C14 alkyl phosphate diester diethanolamine salt (acid value ≤20 mg KOH / g, neutralization degree ≥85%) in the wet brake friction control and noise reduction combination is replaced with C12-C14 alkyl phosphate diester (unneutralized acidic form). The acid value of the common acidic organophosphate is about 80 mg potassium hydroxide / g, and the neutralization degree is 0%, resulting in Comparative Oil F.

[0118] Experimental results: (1) The comparative sample showed slight turbidity after standing at 25℃ for 7 days; (2) After cycling at -20℃ / 60℃ three times, a visible fine precipitate appears; (3) The pressure difference of 10 microns filtration increases by about 26%, and the filtration time is significantly extended; (4) The demulsification time at 54℃ is extended to about 12 minutes.

[0119] Conclusion: Comparative Example 4 shows that when calcium and / or magnesium detergents are present in the system, the acid value or neutralization state of the organophosphate ester component constitutes a critical compatibility boundary. If the organophosphate ester component with an acid value ≤20 mg / g or a neutralization degree ≥85% used in this invention is replaced with a C12-C14 alkyl phosphate diester with an acid value of about 80 mg / g and a neutralization degree of 0%, the clarification, storage stability, and filterability of the mother liquor and the finished oil are significantly reduced.

[0120] Comparative Example 5: Comparative oil G with ordinary PIBSI instead of boronized PIBSI This comparative example uses ordinary polyisobutylene succinimide (PIBSI) in an equal amount to replace boronized polyisobutylene succinimide to investigate the effect of the multi-cycle wear plateau film-forming promoting system. All other conditions are the same as in Example 1, except that ordinary polyisobutylene succinimide is used in an equal amount to replace boronized polyisobutylene succinimide, resulting in control oil G.

[0121] Experimental results: (1) After five wear-rest-re-wear cycles, the diameter of the first wear scar was about 0.43 mm and the diameter of the fifth wear scar was about 0.59 mm, with the fifth wear scar showing an increase of about 37% compared to the first wear scar. (2) The cumulative wear amount increased by approximately 18% compared to Example 4; (3) The peak value of the frictional torque during the first start-up was about 23% higher than that in Example 4.

[0122] Conclusion: Comparative Example 5 shows that the plateauing effect of multi-cycle wear is not inherent in ordinary dispersants, but is related to the boundary adsorption and film stabilization provided by boronized polyisobutylene succinimide.

[0123] Comparative Example 6: Comparative oil H with excessive addition of hexadecyl dimethyl betaine This comparative example was used to investigate the effect of the cetyldimethyl betaine addition window. The main demulsifier and other functional systems were kept unchanged, but the cetyldimethyl betaine was increased to 15% of the mass of the water-stable and rapid demulsification system, corresponding to a mass ratio of approximately 85:15 between ethylene oxide-propylene oxide block copolymer ether and cetyldimethyl betaine, resulting in control oil H.

[0124] Experimental results: (1) Compared with oil H, its demulsification at 54℃ still could not reach 40 ml of oil phase, 40 ml of water phase and 0 ml of emulsion layer within 30 minutes; (2) After standing, approximately 8-10 ml of emulsion layer remains; (3) After adding 0.3% by volume water and undergoing cyclic shearing, the kinematic viscosity change rate at 40℃ is approximately +8.7%; (4) The pressure difference of the filter element increased by about 29%, and visible emulsified gel-like substances appeared on the sample.

[0125] Conclusion: Comparative Example 6 shows that hexadecyl dimethyl betaine must be added in a controlled manner, and excessive amounts will disrupt the balance between "stable operation with low water content" and "rapid phase separation after water content exceeds the threshold".

[0126] Comparative Example 7: Comparison of High-Silicone Defoaming Solutions (Oil I) This comparative example was used to investigate the effect of the boundary between the antifoaming and degassing system on filterability and storage stability. All functional modules and the 10-micron filtration conditions were kept unchanged, but the amount of polydimethylsiloxane (PDMS) added to the antifoaming and degassing system was increased, resulting in a significantly higher effective silicon content in the finished oil compared to Example 4, thus forming a high-silica defoaming scheme and obtaining Comparative Oil I.

[0127] Experimental results: (1) The comparative sample showed slight floating silica spots and fine particles after standing at 25°C for 14 days; (2) The pressure difference of a 10-micron filter increases by approximately 24%; (3) The foamy I sequence is approximately 20 / 0, and the III sequence is approximately 10 / 0; (4) The air release time is extended to about 3.8 minutes.

[0128] Conclusion: Comparative Example 7 shows that the effective silica level in the antifoaming and degassing system should be controlled. If a high-silica defoaming scheme is used, it will disrupt the balance between foam control, air release, filtration and storage stability.

[0129] Experimental Example To verify the substantial improvement of the platform-type additive mother liquor of the present invention (taking the mother liquor A1 used in Example 4 as an example) compared with the conventional UTTO technology, Example 4 and Comparative Examples 3 to 7 were selected for performance testing. The data were the average of three repeated tests, and the results are summarized in Table 11.

[0130] Table 11 Key performance comparison between Example 4 and representative comparative examples:

[0131] As can be seen from Table 11 above, the technical effect of the present invention does not come from the simple assembly of conventional UTTO formulation modules, but from the specific compatibility boundaries and synergistic constraints of the detergent, organic phosphate, aqueous surfactant, and defoaming / filtration in the platform-type additive mother liquor.

[0132] Taking the UTTO type multipurpose agricultural machinery oil shown in Example 4 as an example, it can balance friction stability, demulsification, rust prevention, filter friendliness and disassembly and inspection cleanliness under working conditions such as wet braking, water-containing operation, long-term parking and restart, and multi-cycle wear; the platform type additive mother liquor can also be further used for the formulation of WUTTO and BUTTO.

[0133] In contrast, Comparative Example 3 (without the water-stabilized and rapid demulsification system) completely stripped the interfacial stabilizing framework of ethylene oxide-propylene oxide block copolymer, resulting in a surge in the kinematic viscosity change rate at 40°C to +12.4% after 0.3% volume water content (exceeding the "≤±5%" threshold of this application), a downgrade of steel sheet rust prevention to "pointing rust / significant rust", and a 38% increase in filter element pressure difference. This confirms that the system is a necessary prerequisite for achieving viscosity stability, reliable rust prevention, and filtration friendliness under water-containing conditions. Comparative Example 4 (using common acidic organic phosphate ester) disrupted the acid-base compatibility boundary between the detergent and the phosphate ester, causing instability in the mother liquor storage: it became turbid after standing at 25℃ for 7 days, and fine precipitates formed after cycling at -20 / 60℃. The pressure difference of the 10 μm filter increased by 26%, which could not meet the basic stability requirement of this application that "it can still be filtered by a 10-micron filter element after cycling at -20 / 60℃ 3 times". In contrast, Comparative Example 5 (using ordinary PIBSI instead of boronized PIBSI) lost the boron-mediated chemical adsorption film formation and self-repair function, resulting in a 37% increase in the diameter of the wear scar in the 5th wear cycle compared to the 1st cycle, and a 23% increase in the peak value of the initial friction torque. This proves that boronized dispersant is an irreplaceable technical feature for achieving multi-cycle wear platformization and initial boundary lubrication. In contrast, in Comparative Example 6, the amount of hexadecyl dimethyl betaine was increased to 15% of the mass of the aqueous system, which broke through the synergistic window of the mass ratio of EO / PO polyether and hexadecyl dimethyl betaine, causing an imbalance in demulsification kinetics: the 40 / 40 / 0 endpoint could not be reached within 30 minutes, leaving 8-10 ml of residual emulsion layer, while the viscosity change rate at 40°C reached +8.7%.

[0134] Comparative Example 7 (increasing PDMS content to form a high-silica defoaming solution) breaks the ternary balance of antifoaming-gas release-film formation. Although the foam suppression performance is enhanced, it leads to a 24% increase in filter element pressure difference, the appearance of floating silica spots on the surface, and triggers the first start-up friction fluctuation (0.07–0.18) and a continuous whistling sound for 8 seconds. This confirms that the 5:95 silica-ether mass ratio in this application is the only feasible solution to ensure filtration performance, air release performance and wet braking friction stability.

[0135] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A multi-purpose oil-based additive mother liquor for agricultural machinery, characterized in that, Based on the total mass of the mother liquor, it includes: (a) 14% to 20% of wet brake friction control and noise reduction combination, wherein the wet brake friction control and noise reduction combination includes glyceryl monooleate, 2-ethylhexyl oleate and organophosphate components; (b) 10% to 14% of a high-speed and transient extreme pressure composite system, wherein the high-speed and transient extreme pressure composite system includes zinc dialkyl dithiophosphate, alkyl sulfide and / or isobutylene sulfide, and an organophosphate extreme pressure agent; (c) 8%–12% of a low-speed and static protective film-forming system, wherein the low-speed and static protective film-forming system includes polyisobutylene succinimide and isostearamide; (d) 6%–10% of a multi-cycle wear plateauing film-forming promoting system, wherein the multi-cycle wear plateauing film-forming promoting system includes boronized polyisobutylene succinimide; (e) 10% to 14% of an aqueous stabilized and rapidly demulsifying system, wherein the aqueous stabilized and rapidly demulsifying system comprises ethylene oxide-propylene oxide block copolymer ether; (f) Antioxidant and rust-preventive system 10% to 13%, wherein the antioxidant and rust-preventive system includes hindered phenolic antioxidant, aromatic amine antioxidant and dodecenyl succinate half ester rust inhibitor; (g) 2% to 3% of an antifoaming and degassing system, wherein the antifoaming and degassing system comprises polydimethylsiloxane and a polyether-type degassing agent; (h) The cleaning and disassembly cleanliness control system is 10% to 13%, and the cleaning and disassembly cleanliness control system includes polyisobutylene succinimide and calcium and / or magnesium detergents; (i) The carrier base oil is the balance; The mother liquor does not contain chlorine-containing extreme pressure agents.

2. The multi-purpose oil-based platform additive mother liquor for agricultural machinery according to claim 1, characterized in that, The aqueous stable and rapid demulsification system also includes hexadecyl dimethyl betaine; Preferably, the hexadecyl dimethyl betaine accounts for 0-8% of the mass of the aqueous stable and rapid demulsification system; Preferably, when the hexadecyl dimethyl betaine is present, the mass ratio of the ethylene oxide-propylene oxide block copolymer to the hexadecyl dimethyl betaine is 12:1 to 25:

1.

3. The multi-purpose oil-based platform additive mother liquor for agricultural machinery according to claim 1, characterized in that, The organic phosphate component in the wet braking friction control and noise reduction combination is a C12-C14 alkyl phosphate diester diethanolamine salt. Preferably, the calcium and / or magnesium detergent is selected from at least one of alkyl salicylate calcium, moderately alkaline calcium petroleum sulfonate and magnesium petroleum sulfonate.

4. The multi-purpose oil-based platform additive mother liquor for agricultural machinery according to any one of claims 1 to 3, characterized in that, The hexadecyl dimethyl betaine accounts for 5% of the mass of the aqueous stable and rapid demulsification system, and the mass ratio of the ethylene oxide-propylene oxide block copolymer to the hexadecyl dimethyl betaine is 19:

1. Preferably, in the antifoaming and degassing system, the mass ratio of polydimethylsiloxane to polyether-type degassing agent is 5:

95.

5. A multi-purpose oil for agricultural machinery, characterized in that, It includes base oil and the platform-type additive mother liquor for agricultural machinery multipurpose oil as described in any one of claims 1 to 4, wherein the platform-type additive mother liquor accounts for 8% to 12% of the total mass of the agricultural machinery multipurpose oil.

6. The multi-purpose agricultural machinery oil according to claim 5, characterized in that, The multi-purpose oil for agricultural machinery is one of UTTO, WUTTO, or BUTTO.

7. The multi-purpose agricultural machinery oil according to claim 5, characterized in that, The base oils include combinations of Group II and / or Group III mineral base oils, polyalphaolefin base oils, and / or pentaerythritol tetraisonononate.

8. The multi-purpose agricultural machinery oil according to claim 7, characterized in that, The kinematic viscosity of the base oil at 40°C is 4.0–8.0 mm² / s.

9. The multi-purpose agricultural machinery oil according to claim 5, characterized in that, The multi-purpose oil for agricultural machinery also includes viscosity index improvers and / or polymethyl methacrylate pour point depressants; Preferably, the viscosity index improver accounts for 3% to 10% of the mass of the agricultural machinery multipurpose oil; Preferably, the polymethacrylate pour point depressant accounts for 0.05% to 0.5% of the mass of the agricultural machinery multipurpose oil.

10. The application of the multi-purpose agricultural machinery oil according to any one of claims 5 to 9 in the lubrication system of agricultural machinery, characterized in that, The multi-purpose agricultural machinery oil is used as a common lubricating medium for agricultural machinery gearboxes, rear axles / final drives, hydraulic systems, and wet brake / wet clutch devices.

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