362 results about "Viscosity index" patented technology

The embodiment of the invention provides a building solid waste recycled aggregate production line control method and system, and relates to the technical field of building solid waste recycling, the method comprises the following steps: obtaining a first operation parameter of crushing equipment, and identifying a first characteristic of the crushing equipment influenced by a viscous material according to the first operation parameter; acquiring a second operation parameter of the screening equipment, and identifying a second feature of the screening equipment influenced by the viscous material according to the second operation parameter; acquiring a conveying state of the conveying equipment, and identifying a third feature of the conveying equipment influenced by the viscous material according to the conveying state; performing correlation analysis on the first feature, the second feature and the third feature to obtain a viscous state judgment result of the viscous material; generating a material viscosity index according to the viscosity state judgment result; and according to the material viscosity index, the operation parameters of the crushing equipment, the screening equipment and the conveying equipment are adjusted. The production efficiency and the product quality of the recycled aggregate can be improved, and equipment abrasion and energy consumption are reduced.

The invention belongs to the technical field of oil and gas field development, and particularly relates to a comprehensive evaluation method for the gel breaking degree of gel fracturing fluid. According to the method, a calculation model of the integrity psi after gel breaking of the gel fracturing fluid is established on the basis of the mass of the residual gel separated after gel breaking or the mass of the gel breaking clear liquid in combination with the viscosity of the gel breaking clear liquid, and the gel breaking degree is quantified. According to the method, through weighted calculation of the residual colloid mass or the colloid breaking clear liquid mass and the colloid breaking clear liquid viscosity, a calculation model of the integrity psi after gel breaking of the gel fracturing fluid in different gel breaking stages is established, the gel breaking degree is quantified, and the problem that a traditional single viscosity index cannot be measured or measurement interferes is solved; the problems that the amount of dried solid residues is small, weighing is extremely inconvenient, and large errors are easily caused are solved. The method can adapt to the characteristic difference of different gel breaking stages, the evaluation reliability is remarkably improved, and data support is provided for optimizing the performance of the controlled-release gel breaker.

The invention relates to the technical field of industrial production control, in particular to a production line intelligent control method and device based on the industrial internet and a storage medium, and the method comprises the steps: collecting melt data, mold data and energy consumption data; modeling is carried out on the melt uniformity index, and a dynamic adjustment strategy is generated; a production protection strategy is generated, and meanwhile a speed adjustment threshold value is determined; carrying out feature extraction on the grayscale image of the product surface image, and judging the surface quality state according to a feature extraction result so as to update a dynamic adjustment strategy; constructing an energy consumption index according to the energy consumption data collected in the monitoring period, calculating a comprehensive quality score based on the melt uniformity index, the viscosity index and the energy consumption index in the monitoring period so as to judge the quality state, and comprehensively managing the judgment result of the quality state in the period to send a fault alarm to a user; the production efficiency of the production line is effectively improved.

The invention discloses a preparation method of high-temperature transformer oil, and belongs to the technical field of high-temperature transformer oil. Comprising the following steps: 1, carrying out hydrolysis reaction to obtain ricinoleic acid; step 2, carrying out first esterification reaction to obtain a ricinoleic acid esterification product; 3, performing epoxidation reaction to obtain an epoxidized ricinoleic acid esterification product; 4, carrying out ring-opening reaction to obtain ring-opened castor oil; 5, carrying out a second esterification reaction to obtain modified castor oil base oil; and 6, mixing the modified castor oil base oil, a viscosity index improver, an antioxidant, a demulsifying agent and an extreme pressure agent to obtain the high-temperature transformer oil. The invention provides modified castor oil and a preparation method thereof. The high-temperature antioxidant transformer oil prepared by using the modified castor oil as base oil has the characteristics of environmental protection, degradability, high flash point, high breakdown voltage and the like, and also has excellent oxidation stability.

The invention discloses a graphene oxide-containing lubricating oil composition for a heavy-load methanol fuel engine. The graphene oxide-containing lubricating oil composition is prepared from the following raw materials: a dispersing viscosity index agent, an antioxidant, an anti-wear agent, a clearing agent, a dispersing agent and base oil. The dispersing type viscosity index improver P (BMA + LMA + TMA + NVP) copolymer contains a strong N polar group, so that graphene oxide does not need to be continuously modified, surface functional groups do not need to be removed, the cost is greatly reduced, industrial application is facilitated, meanwhile, the dispersing type viscosity index improver is applied to a methanol fuel engine, can be absorbed with combustion products such as methanol and formic acid and is more beneficial to dispersion of graphene, and therefore, the dispersing type viscosity index improver has a good application prospect. The graphene additive is very suitable for being applied to methanol fuel engine lubricating oil and can be applied to a large scale in a new field.

The invention discloses driving oil for new energy hybrid power automobile power and a preparation method thereof, and particularly relates to the technical field of driving oil, the driving oil comprises 70-85% of base oil, 0.8-2.5% of a conductive inhibitor, 1-3% of a nanometer heat conduction agent, 4-8% of a viscosity index improver, 0.1-0.5% of an ion trapping agent, 3-5% of an anti-wear reagent at extreme pressure, 0.5-1.5% of an antioxidant and 0.001-0.01% of an anti-foaming agent. The preparation method comprises the following steps: S1, base oil pretreatment, S2, nano heat conduction agent in-situ modification, and S3, gradient temperature control compounding. Through compounding of the base oil in a specific proportion and the synergistic effect of multiple additives, the problems of insufficient insulativity, easy oxidation, poor viscosity stability, low heat conduction efficiency, poor material compatibility and the like of traditional oil in a hybrid power system are solved, effective protection of a motor and an electric control system is realized, the heat management efficiency is improved, and the service life of the hybrid power system is prolonged. And the service life of oil is prolonged, the maintenance cost is reduced, and the special requirements of power and driving systems of hybrid vehicles are met.

The application discloses a method and device for producing bright stock, and the obtained bright stock, which comprises the following steps: (1) contacting heavy oil with a hydrogenation catalyst under the presence of hydrogen, and performing hydrogenation reaction under hydrogenation treatment conditions to obtain a hydrogenation product; (2) performing alkylation reaction of aromatics in the hydrogenation product and C10-C20 olefins in olefin oil under the presence of a strong acid catalyst and under alkylation reaction conditions to obtain an alkylation product; and (3) performing distillation separation on the alkylation product to separate and obtain a heavy fraction with a temperature greater than 500 DEG C as the bright stock product. The method provided by the application expands the raw material source of the bright stock, simplifies the process flow, and is convenient for industrial production; and the prepared bright stock product not only has high viscosity and viscosity index, but also has good low-temperature flow performance and high oxidation stability.

The present invention provides a method for lubricating a combustion engine that is suitable for improving at least one of the following: deposits, sludge, oxidation, and wear. [Solution] A method for lubricating a combustion engine comprises lubricating the combustion engine with a lubricating oil composition, wherein the lubricating oil composition comprises a base oil having a lubricating viscosity having more than about 90 weight percent saturated material, less than about 0.03 weight percent sulfur, and more than about 50 weight percent hydrogenated mineral oil having a viscosity index of less than or equal to about 120; a detergent system having less than about 5 weight percent metal from a non-sulfonate detergent and (ii) a total base number (TBN) of a specific value, giving about 60 to about 85 percent of the total lubricating oil composition TBN; an anti-wear system comprising one or more zinc dihydrocarbyl dithiophosphate compounds; and an antioxidant system comprising one or more phenolic antioxidant compounds, one or more amine antioxidant compounds, or a combination thereof.

The invention belongs to the technical field of lubricating oil, and particularly relates to environment-friendly biodegradable lubricating oil for a hydraulic retarder and a preparation method of the environment-friendly biodegradable lubricating oil. The environment-friendly biodegradable lubricating oil for the hydraulic retarder is prepared from the following components in parts by mass: 80 to 90 parts of base oil, 1 to 3 parts of a cleaning agent, 1 to 3 parts of a dispersing agent, 1 to 2 parts of a viscosity index improver, 0.5 to 2 parts of an anti-wear agent, 0.3 to 1.5 parts of an antioxidant, 0.1 to 0.5 part of an anti-foaming agent and 0.1 to 0.3 part of a pour point depressant, the antioxidant comprises hindered phenolic ester, aromatic amine and zinc thiophosphate in a mass ratio of (3-6): (2-5): 1. The environment-friendly biodegradable lubricating oil for the hydraulic retarder, provided by the invention, is biodegradable, and has excellent high-temperature resistance, oxidation resistance and low-temperature resistance and longer oil change period.

The invention provides a bifunctional ionic liquid monomer, an ionic multifunctional viscosity index improver as well as a preparation method and application of the ionic multifunctional viscosity index improver, and belongs to the technical field of lubricating additives. A series of bifunctional ionic liquid monomers are synthesized through molecular design and have the functions of antifriction, wear resistance and cross-linking agents, then the monomers are copolymerized with long-chain alkyl methacrylate, and the ionic multifunctional viscosity index improver is prepared. The molecular structure of the viscosity index agent simultaneously contains an oleophylic alkyl chain, a rigid benzene ring structure and an ionic functional group, so that the solubility, the viscosity increasing performance and the viscosity-temperature performance of the viscosity index agent in base oil are remarkably improved; a biquaternary ammonium salt structure is introduced into a main chain to realize crosslinking of the polyion liquid, so that the tackifying performance of the polyion liquid is improved, phosphorus, sulfur and nitrogen heteroatoms are introduced, physical and chemical adsorption films can be formed on the metal surface, the friction coefficient and the abrasion volume are effectively reduced in the friction process, and the boundary lubricating performance is enhanced.

The present invention discloses a flow velocity analysis method, system, storage medium, and slurry shield machine for preventing mud cake formation on the excavation face of a slurry shield. The method includes the following steps: obtaining the soil physical properties, mud parameters, and stratum parameters of the current shield excavation; obtaining the soil viscosity index, undrained shear strength, and interfacial shear strength; obtaining the soil adhesion, soil cohesion, and fluid forces acting on soil particles; establishing a mathematical model of the critical flow velocity for different starting methods under different working conditions; obtaining the critical slurry flow velocity for different starting methods under different working conditions; and obtaining the critical flow velocity for preventing mud cake formation. The present invention can adapt to different working conditions and different starting methods, quickly determine the critical flow velocity for preventing mud cake formation, avoid the tedious process of frequently adjusting the mud flow velocity in traditional construction, and significantly improve construction efficiency.

The invention relates to the technical field of lubricating oil, in particular to pitting-corrosion-resistant automobile transmission lubricating oil and a preparation method thereof. The method comprises the following steps: (1) mixing and filtering spiral carbon nanotubes, 2, 5-bis (octyl dithio) thiadiazole and pentaerythritol tetraborate triethanolamine ester, and mixing a filtered substance, an antioxidant and phosphorus-doped NiMn-coated CuO / CF treated by a first coupling agent to obtain a composite extreme pressure agent; (2) mixing a composite extreme pressure agent, a purification dispersant, a defoaming agent, a viscosity index improver and the nano-copper treated by the second coupling agent to obtain a composite additive; and (3) uniformly mixing the composite additive, the hydroxylated poly-alpha-olefin and methylcyclopentane according to the mass ratio of (0.1-0.3): 1: (2-3) to obtain the pitting-corrosion-resistant automobile transmission lubricating oil. The composite extreme pressure agent can sequentially form a plurality of extreme pressure agents to form a multi-layer film, so that the wear resistance of the lubricating oil is improved. The lubricating oil provided by the invention has excellent wear resistance.

The invention provides a synthetic lubricating oil composition and application thereof, and belongs to the technical field of lubricating oil. The synthetic lubricating oil composition comprises base oil, a pour point depressant and a composite additive, the base oil comprises synthetic ester base oil; the synthetic ester base oil consists of low-viscosity synthetic ester and high-viscosity synthetic ester. The composition has ultrahigh viscosity index and low-temperature performance, is diesel engine lubricating oil with very excellent low-temperature performance, passes a graphite flake friction characteristic test and a THOT oxidation test required by TES 439 specifications, and can meet the lubrication requirements of an engine and a transmission system.

The invention discloses an aero-engine lubricating oil composition and a preparation method thereof, and relates to the field of lubricating oil. The composition comprises a composite base oil system, an antioxidant, an anti-wear reagent at extreme pressure, a corrosion inhibitor, an anti-foaming agent and an optional viscosity index improver, the composite base oil system is composed of high-purity pentaerythritol ester, poly-alpha-olefin and dipentaerythritol ester, wherein the high-purity pentaerythritol ester is synthesized by two-step esterification of pentaerythritol, binary fatty acid and monobasic fatty acid; according to the preparation method, a staged fine blending process is adopted, and vacuum dehydration and degassing, nitrogen protection and multi-stage filtration are combined. Through base oil structure innovation, additive purity control, function cooperation and process optimization, the high-temperature oxidation stability, extreme pressure wear resistance, corrosion resistance and rubber compatibility of the lubricating oil are remarkably improved.

The invention provides a PAMA type multifunctional lubricating additive based on carboxyl-aluminum crosslinking, a preparation method and application of the PAMA type multifunctional lubricating additive and a lubricating agent, and belongs to the technical field of lubricating materials. By means of carboxyl functionalization of PAMA, adsorption of the additive on the surface of a metal friction pair can be enhanced, generation of an interface friction film is promoted, cross-linking is conducted by introducing cross-linking sites and a cross-linking agent, and the tackifying performance and friction performance of the additive can be further improved; compared with a traditional lubricating additive which needs to be compounded by a plurality of additives to make up the limitation that a single additive has a single function, the carboxyl-aluminum cross-linked PAMA type multifunctional lubricating additive disclosed by the invention can realize function integration of a viscosity index improver and an antifriction and antiwear additive; the introduction of carboxyl not only can enhance interfacial adsorption and improve friction, but also can be used as a crosslinking site to further enhance the tackifying and viscosity-temperature properties through crosslinking, so that the lubricating oil has excellent viscosity-temperature properties and lubricating properties at the same time.

The invention belongs to the field of special oil for aircraft hydraulic systems, and particularly relates to an aviation hydraulic oil composition as well as a preparation method and application thereof. The aviation hydraulic oil composition comprises the following raw materials in percentage by mass: 15%-20% of a viscosity index improver, 0.01%-1% of an antioxidant, 0.01%-1% of an anti-wear agent, 0.1%-2.0% of an anti-rust agent, 0.01%-0.1% of an anti-foaming agent, 0.01%-0.1% of a coloring agent and the balance of base oil. The aviation hydraulic oil composition disclosed by the invention has excellent low-temperature fluidity, high-temperature stability, anti-rust property and rubber compatibility, particularly has extremely good high-low temperature viscosity stability, and can ensure that an aircraft landing gear and a hydraulic system smoothly operate in an environment with relatively large high-low temperature change amplitude.

The purpose of the invention is both to suppress viscous resistance loss at compressor start (normal temperature) and improve oil film load performance during operation (high temperature) in a refrigerating machine oil and a refrigerating device. A refrigerating machine oil according to the present disclosure is for a refrigerating device in which propane is sealed therein as a refrigerant, said refrigerating machine oil containing an ester-based oil having a viscosity grade of ISO VG32 or less, and a viscosity index improver containing a polymethacrylic acid ester having a C1-18 alkyl substituent, the concentration of the polymethacrylic acid ester being from 0.6 to 6 wt%.

The invention relates to the technical field of industrial gear lubricating oil, in particular to an industrial gear oil composition. The composition comprises the following components in percentage by weight: 10%-30% of rerefined base oil, 5%-40% of synthetic ester or bio-ester base oil, 20%-70% of second-class mineral base oil, 1.0%-5.0% of an anti-wear composite additive and 5.0%-10.0% of a viscosity index improver, wherein the synthetic ester or bio-ester base oil is selected from one or more of diisononanoic acid ester, trimethylolpropane ester, pentaerythritol ester or rapeseed oil ester; the anti-wear composite additive comprises 5.0%-9.9% of trialkyl phosphate, 1.0%-4.9% of alkyl borate or alkyl boric acid polyether, 1.0%-4.9% of alkenyl amine and the balance of mineral oil; the viscosity index improver is a star type or comb type polymethacrylate polymer.

The application belongs to the technical field of shock absorber oil, and particularly relates to a silicon-based shock absorber oil for racing cars and a preparation method thereof. The silicon-based shock absorber oil for racing cars comprises, by mass percentage, 50-60 parts of silicone oil, 40-50 parts of base oil, 3-6 parts of a viscosity index improver, 0.2-0.5 parts of an extreme pressure anti-wear agent, 0.2-0.5 parts of a pour point depressant, and 0.2-0.5 parts of an antioxidant. The extreme pressure anti-wear agent comprises thiazolyl disulfide dimers and poly-methyl acrylate modified nanoscale spherical boron nitride. The silicon-based shock absorber oil for racing cars has excellent viscosity-temperature performance, shear stability, heat resistance, wear resistance, corrosion resistance and high-temperature foam resistance.

The invention discloses a gas engine oil composition as well as a preparation method and an application thereof. The gas engine oil composition comprises the following components in percentage by weight: 70.7-72.5% of III-type base oil, 0.1-0.5% of an antioxidant, 0.1-0.5% of a lubricant and 0.1-0.5% of a lubricant. 11.5 to 11.8% of a composite additive; 13 to 13.5 percent of a viscosity index improver; 2-3% of a base number improver; 0.5-1% of a base number retention agent; and 0.2-0.3% of a pour point depressant. According to the invention, the ash-free base number increasing agent and the base number keeping agent are added and have a synergistic effect, so that the base number of the gas engine oil is effectively increased, the problem that the base number is quickly reduced is solved, and abnormal phenomena such as engine hardware abrasion and corrosion caused by too quick base number attenuation in the use process are avoided; the low-ash-content high-base-number oil-change additive has the characteristics of low ash content, high base number and slow base number attenuation, can meet the requirement of 120 thousand kilometer long oil change mileage, effectively prolongs the oil change period of oil products, and reduces the use cost of the oil products.

A low-viscosity lubricating oil composition with improved durability and NVH (noise, vibration, and harshness) performance is provided. The durability and NVH performance of the low-viscosity lubricating oil can be further enhanced by a suitable combination of mineral and / or synthetic oil and a viscosity index improver.

The invention relates to lubricating oil for an electric drive axle of a commercial vehicle and a preparation method thereof, and belongs to the technical field of lubricating oil. The lubricating oil for the electric drive bridge comprises the following components in parts by weight: 85-95 parts of base oil, 2-10 parts of a composite additive, 2-8 parts of a viscosity index improver and 0.1-0.5 part of an electric drive oil reinforcing agent, the base oil is a combination of coal-to-liquid and poly-alpha-olefin; the total amount of the components is 100 parts. The invention also provides a preparation method of the lubricating oil for driving the axle. By optimizing a lubricating formula, the problems of high rotating speed, high load, large torque and multi-working-condition operation of an electric drive axle are solved in a targeted manner, and compared with traditional GL-5 gear oil, transmission efficiency can be remarkably improved, the service life of parts can be prolonged, electrical safety can be guaranteed, and the lubricating oil is a key guarantee for reliable operation of an electric drive axle system.

According to one embodiment, provided is a method for preparing regenerated lubricating base oil from waste lubricating oil, the method comprising: a) performing a first pretreatment on the waste lubricating oil; b) distilling to recover a fraction with a specific boiling point in the waste lubricating oil subjected to the first pretreatment; c) subjecting the fraction recovered in the distillation step to a second pretreatment; and a step d) of hydrotreating the second pretreated fraction in the presence of a catalyst. The viscosity index (VI) of the regenerated lubricating base oil prepared according to the method is 130 or above. The method disclosed by the invention can be used for preparing the high-grade lubricating base oil only by using the waste lubricating oil as a supply raw material, so that the cost of raw materials for preparing the lubricating base oil can be reduced, and the method has the advantage of environmental protection.

The present invention proposes a thickened hydraulic oil composition comprising the following components, by weight: 5-8% viscosity index improver, 0.5-3% extreme pressure antiwear agent, 0.1-3% antioxidant, 0.05-0.3% rust inhibitor, 0.01-0.1% passivator, 0.001-0.03% antifoaming agent, with the balance being base oil. This thickened hydraulic oil composition, obtained by combining a polymethacrylate viscosity index improver with an extreme pressure antiwear agent, exhibits excellent viscosity-temperature performance and low-temperature starting performance, as well as superior extreme pressure and antiwear properties, ensuring smooth equipment operation.

The invention belongs to the technical field of lubricating oil, and particularly relates to a lubricating oil composition with a long oil change period as well as a preparation method and application thereof. The lubricating oil composition disclosed by the invention is prepared from the following components based on the total weight of the lubricating oil composition: 0.8 to 1.8 percent of a metal detergent, 1.5 to 2.5 percent of an ashless dispersant, 0.5 to 1.3 percent of an antioxidant and antiwear agent, 0.1 to 0.8 percent of an auxiliary antioxidant, 5 to 10 percent of a viscosity index improver, 0.2 to 0.5 percent of a pour point depressant, 0.001 to 0.01 percent of an anti-foaming agent and the balance of base oil. The lubricating oil composition disclosed by the invention passes a program IIIE engine bench test in the SJ standard requirement, the performance meets the SJ index requirement, the test time is prolonged by 40% compared with the standard time, and the lubricating oil composition has excellent volatile resistance and less engine oil consumption and meets the requirement of a gasoline engine generator for a long oil change period of 150h in the actual use process.

This invention discloses a method for producing base oil. The raw material is mixed with hydrogen and then fed into a graded hydroisomerization dewaxing reactor. The mixture sequentially passes through a protective agent layer and a catalyst layer for hydroisomerization. The resulting catalytic product undergoes boiling point trimming to obtain base oil with a fraction exceeding 340°C. Along the flow path, the total acid content of the catalyst first increases and then decreases, and the molar percentage of acid in the total acid content also first increases and then decreases. The reaction temperature of the protective agent layer is lower than that of the catalyst layer, and the reaction temperature within the catalyst layer first increases and then remains constant or decreases. This invention, by using a specifically graded hydroisomerization dewaxing reactor and setting different temperature zones, produces base oil with higher yields, lower sulfur and nitrogen content, and effectively reduces the low-temperature performance (pour point and cloud point) of the base oil, resulting in a higher viscosity index and improved base oil quality.

The invention discloses a high-load bearing lubricant for a Morgan rolling mill and a preparation method of the high-load bearing lubricant. The lubricant comprises synthetic base oil, modified titanium-silicon composite particles, slow-release antioxidant microcapsules, an organic molybdenum anti-wear agent, an extreme pressure additive, an environment-friendly ternary antirust agent and a viscosity index improver. Modified nanoparticles are prepared through atomization melting and solvent heat treatment, antioxidant microcapsules are prepared through a polyethylene glycol coating technology, and then the composite lubricating system is formed through high-temperature and high-shear mixing. The lubricant disclosed by the invention has excellent extreme pressure anti-wear performance, thermal oxidation stability, anti-rust and anti-corrosion capability and good oil-water separation performance, and is suitable for a rolling mill bearing lubricating system under severe working conditions of high load, high temperature, high humidity and the like. The lubricant can effectively prolong the service life of the bearing and reduce the operation and maintenance cost of equipment, and has a good industrial application prospect.

The invention relates to a lubricating oil viscosity index improver and a lubricating oil composition comprising the same. More specifically, provided is a lubricating oil viscosity index improver comprising a liquid alpha-olefin copolymer in which ethylene and an alpha-olefin monomer having 3 or more carbon atoms are copolymerized, where the liquid alpha-olefin copolymer is characterized by having a viscosity index at a temperature between 10,000 g / mol and 120,000 g / mol. The composition has a weight average molecular weight (Mw) in the range of 50,000 g / mol to 50,000 g / mol, a thickening capacity at a temperature of 100 DEG C of greater than 2.5 cSt and less than 3.6 cSt, and a permanent shear stability index (PSSI) of greater than 1 and less than 25. In addition, a lubricating oil composition comprising a lubricating oil viscosity index improver is presented.

The invention belongs to the technical field of lubricating oil, and particularly relates to an energy-saving engine oil composition and application thereof. The engine oil composition is prepared from the following raw material components: base oil, a clearing agent, an ashless dispersant, a phenolic ester type amine antioxidant, an anti-wear agent, a viscosity index improver, a pour point depressant, an ionic liquid additive and an anti-foaming agent, wherein the ionic liquid additive is a quaternary ammonium salt-containing ester anti-wear agent, and the chemical structural formula of the ionic liquid additive is as follows: the composition is prepared by selecting an engine oil complexing agent, a viscosity index improver styrene copolymer, a pour point depressant and ionic liquid from the base oil which is III type base oil, PAO type base oil or a mixture of the III type base oil and the PAO type base oil. The catalyst has the characteristics of low phosphorus, low sulfur and low ash content. The normal lubrication working condition of the engine oil is met, the abrasion resistance of the engine oil is improved, and a good energy-saving effect is achieved.

The invention belongs to the field of lubricating oil, and particularly relates to a multi-gear gearbox lubricating oil composition as well as a preparation method and application thereof. The multi-gear gearbox lubricating oil composition is prepared from the following raw materials in percentage by mass: 2.0 percent to 4.5 percent of a viscosity index improver, 0.01 percent to 0.08 percent of a clearing agent, 4.5 percent to 7.0 percent of a dispersing agent, 0.3 percent to 1.0 percent of an anti-wear reagent at extreme pressure, 0.05 percent to 0.3 percent of an anti-rust agent, 0.3 percent to 1.5 percent of an antioxidant, 0.01 percent to 0.2 percent of a metal deactivator, 0.3 percent to 1.5 percent of a cross-linking agent, 0.01 percent to 0.03 percent of an anti-foaming agent and the balance of base oil. The cross-linking agent of the composition adopts trimethylolpropane tri (1H-imidazole-1-acetate), so that the wear resistance of an oil product is effectively enhanced, the friction coefficient is reduced, and the friction durability is improved, thereby achieving the effects of prolonging the endurance mileage and prolonging the service life of hardware.