Industrial gear oil composition and preparation method thereof

Abstract

The invention provides an industrial gear oil composition and a preparation method thereof. The industrial gear oil composition comprises an imidazoline derivative, an antioxidant, an anti-wear reagent at extreme pressure, a metal corrosion inhibitor and a main amount of lubricating base oil, the structure of the imidazoline derivative is shown as a formula (I): # imgabs0 #, in the formula (I), n is an integer between 1 and 10, and each R group is independently selected from C2-C5 alkylene; the R0 group is selected from C15-C20 alkyl, cycloalkyl or alkenyl; and each R'group is independently selected from alkyl groups of C1 to C20, aryl groups of C6 to C10, and aryl groups of C6 to C10 substituted by straight chain or branched chain alkyl groups of C1 to C10. The industrial gear oil composition disclosed by the invention has excellent extreme pressure anti-wear performance and anti-oxidation and anti-corrosion performance, can be applied to industrial gear oil products with various viscosity levels such as 150, 220, 320, 460, 680, 1000 and the like, and is particularly suitable for being used as gear oil products with relatively high performance requirements on load bearing, shear resistance, service life and the like.

Description

Technical Field

[0001] The present invention relates to a lubricating oil composition, in particular to an industrial gear oil composition and a preparation method thereof. Background Art

[0002] In recent years, industrial machinery has been developing towards higher performance, higher power, and more severe operating conditions. This has led to increasing demands for all parts of the machinery to possess higher levels of wear resistance, aging resistance, corrosion resistance, low-temperature fluidity, and shear resistance. To ensure the long-term, stable operation of industrial machinery, industrial gear oils are required to possess outstanding anti-wear properties, good low-temperature fluidity, and a long lifespan.

[0003] In recent years, wind turbines have been widely used to produce clean energy. They are subject to high working stress and high oil change costs. In addition, many devices stand at sea or in high-latitude areas for a long time, requiring the relevant lubricants to have good shear stability, water separation performance and corrosion resistance.

[0004] Currently, existing industrial gear oil compositions must meet the requirements of greater load-bearing capacity while also taking into account the need for long-term operation and are required not to cause corrosion to the gear surface.

[0005] Therefore, the prior art still needs a gear oil composition that can not only meet the increasingly stringent requirements of today's higher-specification products for long-life performance, but also exhibit excellent metal corrosion resistance. Developing an industrial gear oil composition that is resistant to oxidation and corrosion under high loads is of great significance. Summary of the Invention

[0006] The invention provides an industrial gear oil composition and a preparation method thereof.

[0007] The industrial gear oil composition of the present invention comprises: an imidazoline derivative, an antioxidant, an extreme pressure anti-wear agent, a metal corrosion inhibitor and a major amount of lubricating base oil, wherein the structure of the imidazoline derivative is shown in formula (I):

[0008]

[0009] In formula (I), n is an integer between 1 and 10, each R group is independently selected from a C2 to C5 alkylene group; R0 group is selected from C 15 ~C 20 alkyl, cycloalkyl or alkenyl; each R' group is independently selected from C1 to C 20 Alkyl, C6~C 10 Aryl, C1~C 10 C6~C 10 of aromatic groups.

[0010] According to the present invention, the R0 group can be C 15 ~C 20 The alkyl group can also be C 15 ~C 20 The cycloalkyl group can also be C 15 ~C 20 The alkenyl group. 15 ~C 20 The alkenyl group may be a group containing one or more carbon-carbon double bonds within the group and an alkyl group at the end of the group, a group with a carbon-carbon double bond at the end of the group, or a group containing one or more carbon-carbon double bonds within the group and a carbon-carbon double bond at the end of the group.

[0011] According to the present invention, preferably, in formula (I), n is an integer between 1 and 5 (for example, 1, 2, 3, 4 or 5), each R group is independently selected from ethylene or propylene; R0 group is selected from C 16 ~C 18 Each R' group is independently selected from C2 to C8 alkyl, phenyl, C4 to C 10 The phenyl group substituted by a straight or branched alkyl group. 10 The straight chain or branched alkyl substituted phenyl group is preferably replaced by C4 to C 10 The phenyl group substituted with a straight-chain or branched alkyl group may be, for example, p-butylphenyl, p-isooctylphenyl, or p-nonylphenyl.

[0012] According to the present invention, the imidazoline derivative may be one or more of the following compounds:

[0013]

[0014]

[0015] According to the present invention, the preparation method of the imidazoline derivative comprises the following steps:

[0016] (1) reacting CS2 with a compound represented by formula (X);

[0017]

[0018] The R' groups are independently selected from C1 to C 20 Alkyl, C6~C 10 Aryl, C1~C 10 C6~C 10 aromatic groups;

[0019] (2) reacting the reaction product of step (1) with a compound represented by formula (Y), and collecting the product;

[0020]

[0021] wherein n is an integer between 1 and 10, each R group is independently selected from a C2 to C5 alkylene group; R0 group is selected from a C 15 ~C 20 an alkyl, cycloalkyl or alkenyl group.

[0022] According to the present invention, preferably, n is an integer between 1 and 5 (for example, 1, 2, 3, 4 or 5), each R group is independently selected from ethylene or propylene; R0 group is selected from C 16 ~C 18 Each R' group is independently selected from C2 to C8 alkyl, phenyl, C4 to C 10 The phenyl group substituted by a straight or branched alkyl group. 10 The straight chain or branched alkyl substituted phenyl group is preferably replaced by C4 to C 10 The phenyl group substituted with a straight-chain or branched alkyl group may be, for example, p-butylphenyl, p-isooctylphenyl, or p-nonylphenyl.

[0023] According to the present invention, in step (1), the reaction formula between CS2 and the compound represented by formula (X) is as follows.

[0024]

[0025] According to the present invention, in step (2), the reaction formula between the reaction product of step (1) and the compound represented by formula (Y) is as follows.

[0026]

[0027] According to the present invention, in step (1), the molar ratio between CS2 and the compound represented by formula (X) can be 0.8 to 1.3:1, preferably 0.9 to 1.2:1; in step (2), the molar ratio between the compound represented by formula (Y) and CS2 in step (1) can be 1:0.5 to 1.5, preferably 1:0.8 to 1.2.

[0028] According to the present invention, in step (1), the temperature for the reaction between CS2 and the compound represented by formula (X) can be 10 to 50° C., preferably 15 to 25° C.; the reaction time is usually 0.5 to 5 h, preferably 0.5 to 2.5 h; in step (2), the temperature for the reaction between the reaction product of step (1) and the compound represented by formula (Y) can be 60 to 100° C., preferably 70 to 90° C.; the reaction time is usually 0.5 to 3 h, preferably 1 to 2 h.

[0029] According to the present invention, the compound represented by formula (Y) can be prepared by subjecting the compound represented by formula (α) and the compound represented by formula (β) to an amidation dehydration reaction followed by a cyclodehydration reaction;

[0030]

[0031] wherein n is an integer between 1 and 10, each R group is independently selected from a C2 to C5 alkylene group; R0 group is selected from a C 15 ~C 20 an alkyl, cycloalkyl or alkenyl group.

[0032] According to the present invention, preferably, n is an integer between 1 and 5 (for example, 1, 2, 3, 4 or 5), each R group is independently selected from ethylene or propylene; R0 group is selected from C 16 ~C 18 alkyl or alkenyl.

[0033] According to the present invention, the molar ratio between the compound represented by formula (α) and the compound represented by formula (β) can be 1 to 2:1, preferably 1 to 1.5:1; during the reaction of the compound represented by formula (α) and the compound represented by formula (β), the temperature for the amidation dehydration reaction can be 140 to 180°C, preferably 140 to 160°C, and the reaction time is usually 1 to 3 hours, preferably 1 to 2 hours; the temperature for the cyclodehydration reaction can be 180 to 250°C, preferably 220 to 240°C, and the reaction time is usually 2 to 6 hours, preferably 3 to 5 hours.

[0034] According to the present invention, a water-carrying agent may or may not be added during the reaction between the compound represented by formula (α) and the compound represented by formula (β). The water-carrying agent may be an aromatic hydrocarbon solvent, such as xylene.

[0035] According to the present invention, the compound represented by formula (X) can be selected from one or more of di-n-butylamine, diphenylamine, 4-butyldiphenylamine, 4,4'-di-n-butyldiphenylamine, 4-isooctyldiphenylamine and 4,4'-diisooctyldiphenylamine; the compound represented by formula (α) can be selected from one or more of diethylenetriamine, triethylenetetramine, tetraethylenepentamine and pentaethylenehexamine; and the compound represented by formula (β) can be selected from one or more of hexadecanoic acid, octadecanoic acid, oleic acid and linoleic acid.

[0036] According to the present invention, in step (2), the product of the reaction product of step (1) and the compound shown in formula (Y) reacts comprises the imidazoline derivative main product and a small amount of by-products. Since these by-products themselves can be used as additives, these by-products can be separated out in step (2), or these by-products can be retained in the product and directly used as additives. Those skilled in the art can obtain pure imidazoline derivatives by purification or separation methods, such as those that can be enumerated by vacuum distillation, molecular distillation, column chromatography or preparative chromatography.

[0037] According to the present invention, the imidazoline derivative has excellent antioxidant and metal corrosion resistance, can improve the anti-aging and antioxidant capabilities of oil products, and significantly improve the corrosion of metal surfaces by polar additives in oil products.

[0038] According to the present invention, the antioxidant can be selected from one or more of amine antioxidants, phenolic antioxidants, phenolic ester antioxidants and thiophenolic ester antioxidants. For example, one or more of octylbutyldiphenylamine, N-phenyl-α-naphthylamine, 2,6-di-tert-butyl-p-cresol, 3,5-di-tert-butyl-4-hydroxyphenyl methyl acrylate and methylene 4,4'-thiobis-(2,6-di-tert-butylphenol) can be selected. Common trade names include Irganox L57, T534, T531, T501, T512, RC7215, etc.

[0039] According to the present invention, the extreme pressure anti-wear agent can be selected from one or more of olefin sulfide, phosphate, phosphite, dialkyl dithiocarbamate and phosphate amine salt. For example, one or more of isobutylene sulfide, tricresyl phosphate, acidic phosphite, diisobutyl dithiocarbamate and thiophosphate complex amine salt can be selected. Common trade names include T321, T306, Irgalube 349, T304, VANLUBE 7723, T307, Hitec571, etc.

[0040] According to the present invention, the metal corrosion inhibitor can be selected from benzotriazole derivatives and / or thiadiazole derivatives, for example, one or more of N,N'-di-n-butylaminomethylenebenzotriazole, benzotriazole derivatives and thiadiazole polymer derivatives can be selected. Common trade names include T551, T555, T571, T561, VANLUBE 829, VANLUBE 972, etc.

[0041] According to the present invention, the lubricating base oil can be a synthetic lubricating base oil, for example, a polyol ester and / or a poly-α-olefin copolymer can be selected, preferably a mixture of a polyol ester and a poly-α-olefin copolymer, the mass ratio between the two can be 5-15:85-95, and more preferably the kinematic viscosity at 40°C is 50-750mm 2 / s mixture of polyol ester and poly-α-olefin copolymer.

[0042] According to the present invention, the viscosity of the polyol ester at 100°C can be 3 to 7 mm 2 / s; the viscosity of the poly α-olefin copolymer at 100 ° C may be 3 to 100 mm 2 / s. Common brand names include PAO4, PAO4plus, PAO6, PAO6plus, PAO8, PAO8plus, mPAO20, mPAO40, mPAO50, mPAO65, mPAO100, mPAO150, etc.

[0043] According to the present invention, the imidazoline derivative accounts for 0.01% to 1% (preferably 0.01% to 0.5%, more preferably 0.01% to 0.3%) of the total mass of the industrial gear oil composition; the antioxidant accounts for 0.01% to 10% (preferably 0.1% to 5%, more preferably 0.2% to 3%) of the total mass of the industrial gear oil composition; the extreme pressure anti-wear agent accounts for 0.1% to 10% (preferably 0.2% to 8%, more preferably 0.5% to 3%) of the total mass of the industrial gear oil composition; the metal corrosion inhibitor accounts for 0.01% to 5% (preferably 0.01% to 4%, more preferably 0.02% to 1%) of the total mass of the industrial gear oil composition; and the lubricating base oil constitutes the main component of the industrial gear oil composition.

[0044] According to the present invention, the method for preparing the industrial gear oil composition comprises the step of mixing the components thereof.

[0045] The industrial gear oil composition of the present invention has excellent extreme pressure and anti-wear properties and antioxidant and anti-corrosion properties, and can be applied to industrial gear oil products of various viscosity grades such as 150, 220, 320, 460, 680, and 1000. It is particularly suitable for use as a gear oil product with high requirements for performance such as load bearing, shear resistance, and service life. DETAILED DESCRIPTION

[0046] The present invention is further described below by way of examples, which are not intended to limit the present invention. The main raw materials used are as follows:

[0047] Raw material name Specification Source of raw materials Dibutylamine 99％ Zhejiang Jiande Jianye Organic Chemical Co., Ltd. Carbon disulfide analytically pure Sinopharm Chemical Reagent Co., Ltd. Oleic acid, linoleic acid analytically pure Beijing Inokai Technology Co., Ltd. diethylenetriamine 98％ Tianjin Beilian Fine Chemical Co., Ltd. Dodecenylsuccinic acid Industrial products Shandong Nengju Chemical Co., Ltd. 4-Butyldiphenylamine 97％ Beijing Inokai Technology Co., Ltd. 4,4'-di-n-butyldiphenylamine 97％ Beijing Inokai Technology Co., Ltd. 4,4'-Diisooctyldiphenylamine 98％ MacLean Biotechnology Co., Ltd.

[0048] Example 1

[0049] (1) 113 g of diethylenetriamine was added to a reaction kettle, and 282 g of oleic acid was added dropwise to the reaction kettle at 90° C. The temperature was raised to 160° C. for amidation dehydration. After 18 ml of water was removed, the temperature was raised to 240° C. for cyclization dehydration. After another 18 mL of water was removed, the reaction was stopped to obtain a hydrocarbon-substituted imidazoline.

[0050]

[0051] (2) 129 g of di-n-butylamine and 76 g of carbon disulfide were reacted in 100 mL of water at a reaction temperature of 20° C. for 2 hours to generate a dithiocarbamic acid intermediate.

[0052]

[0053] (3) adding the hydrocarbon-substituted imidazoline obtained in step (1) to the dithiocarbamic acid intermediate obtained in step (2), reacting at 80° C. for 2 hours, and removing hydrogen sulfide to obtain the imidazoline derivative of the present invention.

[0054]

[0055] In the product of embodiment 1, comprise described imidazoline derivative main product and a small amount of alkyl substituted imidazoline by-product, the by-product that fails cyclization oleamide by-product, alkyl substituted imidazoline continues to carry out amidation reaction with oleic acid, the by-product that fails cyclization oleamide continues to carry out amidation reaction with oleic acid.Because these by-products all can be used as lubricating oil additive, therefore in the present embodiment, there is no need to separate these by-products.Those skilled in the art can obtain pure imidazoline derivative by known purification or separation method.

[0056] Example 2

[0057] (1) 113 g of diethylenetriamine was added to a reaction kettle, and 280 g of linoleic acid was added dropwise to the reaction kettle at 90° C. The temperature was raised to 160° C. for amidation dehydration. After 18 ml of water was removed, the temperature was raised to 240° C. for cyclization dehydration. After another 18 mL of water was removed, the reaction was stopped to obtain a hydrocarbon-substituted imidazoline.

[0058] (2) 129 g of di-n-butylamine and 76 g of carbon disulfide were reacted in 100 mL of water at a reaction temperature of 20° C. for 2 hours to generate a dithiocarbamic acid intermediate.

[0059] (3) adding the hydrocarbon-substituted imidazoline obtained in step (1) to the dithiocarbamic acid intermediate obtained in step (2), reacting at 80° C. for 2 hours, and removing hydrogen sulfide to obtain the imidazoline derivative of the present invention.

[0060] Its structure is shown below.

[0061]

[0062] Example 3

[0063] (1) 113 g of diethylenetriamine was added to a reaction kettle, and 282 g of oleic acid was added dropwise to the reaction kettle at 90° C. The temperature was raised to 160° C. for amidation dehydration. After 18 ml of water was removed, the temperature was raised to 240° C. for cyclization dehydration. After another 18 mL of water was removed, the reaction was stopped to obtain a hydrocarbon-substituted imidazoline.

[0064] (2) 226 g of 4-butyldiphenylamine and 76 g of carbon disulfide were reacted in 100 mL of water at a reaction temperature of 20° C. for 2 hours to generate a dithiocarbamic acid intermediate.

[0065] (3) adding the hydrocarbon-substituted imidazoline obtained in step (1) to the dithiocarbamic acid intermediate obtained in step (2), reacting at 80° C. for 2 hours, and removing hydrogen sulfide to obtain the imidazoline derivative of the present invention.

[0066] Its structure is shown below.

[0067]

[0068] Example 4

[0069] (1) 113 g of diethylenetriamine was added to a reaction kettle, and 282 g of oleic acid was added dropwise to the reaction kettle at 90° C. The temperature was raised to 160° C. for amidation dehydration. After 18 ml of water was removed, the temperature was raised to 240° C. for cyclization dehydration. After another 18 mL of water was removed, the reaction was stopped to obtain a hydrocarbon-substituted imidazoline.

[0070] (2) 283 g of 4,4'-di-n-butyldiphenylamine and 76 g of carbon disulfide were reacted in 100 mL of water at a reaction temperature of 20°C for 2 hours to generate a dithiocarbamic acid intermediate.

[0071] (3) adding the hydrocarbon-substituted imidazoline obtained in step (1) to the dithiocarbamic acid intermediate obtained in step (2), reacting at 80° C. for 2 hours, and removing hydrogen sulfide to obtain the imidazoline derivative of the present invention.

[0072] Its structure is shown below.

[0073]

[0074] Example 5

[0075] (1) 113 g of diethylenetriamine was added to a reaction kettle, and 282 g of oleic acid was added dropwise to the reaction kettle at 90° C. The temperature was raised to 160° C. for amidation dehydration. After 18 ml of water was removed, the temperature was raised to 240° C. for cyclization dehydration. After another 18 mL of water was removed, the reaction was stopped to obtain a hydrocarbon-substituted imidazoline.

[0076] (2) 395 g of 4,4'-diisooctyldiphenylamine and 76 g of carbon disulfide were reacted in 100 mL of water at a reaction temperature of 20°C for 2 hours to generate a dithiocarbamic acid intermediate.

[0077] (3) adding the hydrocarbon-substituted imidazoline obtained in step (1) to the dithiocarbamic acid intermediate obtained in step (2), reacting at 80° C. for 2 hours, and removing hydrogen sulfide to obtain the imidazoline derivative of the present invention.

[0078] Its structure is shown below.

[0079]

[0080] Comparative Example 1

[0081] 113g of diethylenetriamine was placed in a reaction kettle. 282g of oleic acid was added dropwise at 90°C. The temperature was raised to 160°C for amidation dehydration. After 18ml of water was removed, the temperature was raised to 240°C for further cyclodehydration. The reaction was terminated after another 18ml of water was removed to yield a alkyl-substituted imidazoline. Its structure is shown below.

[0082]

[0083] Comparative Example 2

[0084] (1) 113 g of diethylenetriamine was placed in a reaction kettle, and 282 g of oleic acid was added dropwise to the reaction kettle at 90°C. The temperature was raised to 160°C for amidation dehydration. After 18 ml of water was removed, the temperature was raised to 240°C for cyclodehydration. After another 18 mL of water was removed, the reaction was stopped to obtain a hydrocarbon-substituted imidazoline.

[0085] (2) Add dodecenylsuccinic acid to the hydrocarbon-substituted imidazoline obtained in step (1), and react at 130° C. for 2 hours to obtain heptadecenyl imidazoline alkenylsuccinate. The structure of the heptadecenyl imidazoline alkenylsuccinate is shown below.

[0086]

[0087] Examples I-1 to I-5 and Comparative Examples DI-1 to DI-3 of Industrial Gear Oil Compositions

[0088] According to the formulation in Table 1, industrial gear oil compositions of Examples I-1 to I-5 and Comparative Examples DI-1 to DI-3 were prepared. Performance tests were conducted on these compositions. The test items and methods are shown in Table 2.

[0089] The main lubricant additives and base oils used are from the following sources:

[0090] Imidazoline derivatives, products of Examples 1 to 5, and products of Comparative Examples 1 to 2;

[0091] Amine antioxidant, Irganox L57, BASF;

[0092] Extreme pressure anti-wear agent, sulfided isobutylene, T321, Zibo Huihua Chemical Co., Ltd.;

[0093] Extreme pressure antiwear agent, alkyl phosphate, Irgalube 349, BASF;

[0094] Metal corrosion inhibitor, T551, Zibo Huihua Chemical Co., Ltd.;

[0095] Lubricating base oil, polyol ester, NPE-3 (viscosity 23.2mm at 40℃ 2 / s), Shandong Liaocheng Ruijie Chemical Co., Ltd.;

[0096] Lubricating base oil, PAO6 (40℃ viscosity 31mm 2 / s), Sinopec Maoming Petrochemical;

[0097] Lubricating base oil, mPAO65 (viscosity 630mm at 40℃ 2 / s), Sinopec Maoming Petrochemical.

[0098] Table 1: Formulation of industrial gear oil composition

[0099]

[0100] Table 2 Test items and methods

[0101] project Test methods <![CDATA[Kinematic viscosity / (mm 2 / s)]]> GB / T 265 Apparent viscosity (-30℃) / (mPa·s) GB / T 11145 Pour point / ℃ GB / T 3535 Copper corrosion (100℃, 3h) / level GB / T 5096 Liquid phase corrosion test (artificial seawater, 24h) GB / T 11143 Four-ball machine test SH / T 0189 Oxidation stability (121℃, 312h) SH / T 0123

[0102] The performance test results are shown in Table 3.

[0103] Table 3 Performance test results of industrial gear oil

[0104]

Claims

1. An industrial gear oil composition comprising: An imidazoline derivative, an antioxidant, an extreme pressure antiwear agent, a metal corrosion inhibitor, and a major amount of lubricating base oil, wherein the structure of the imidazoline derivative is shown in formula (I): In formula (I), n is an integer between 1 and 10, each R group is independently selected from a C2 to C5 alkylene group; R0 group is selected from C 15 ~C 20 alkyl, cycloalkyl or alkenyl; each R' group is independently selected from C1 to C 20 Alkyl, C6~C 10 Aryl, C1~C 10 C6~C 10 of aromatic groups.

2. The industrial gear oil composition according to claim 1, characterized in that In formula (I), n is an integer between 1 and 5, each R group is independently selected from ethylene or propylene; R0 group is selected from C 16 ~C 18 Each R' group is independently selected from C2 to C8 alkyl, phenyl, C4 to C 10 The phenyl group substituted by a straight chain or branched alkyl group (the C4 to C 10 The straight chain or branched alkyl substituted phenyl group is preferably replaced by C4 to C 10 a phenyl group substituted with a straight-chain or branched-chain alkyl group).

3. The industrial gear oil composition according to claim 1, characterized in that The imidazoline derivatives are one or more of the following compounds:

4. The industrial gear oil composition according to claim 1, characterized in that The preparation method of the imidazoline derivative comprises the following steps: (1) reacting CS2 with a compound represented by formula (X); The R' groups are independently selected from C1 to C 20 Alkyl, C6~C 10 Aryl, C1~C 10 C6~C 10 aromatic groups; (2) reacting the reaction product of step (1) with a compound represented by formula (Y), and collecting the product; wherein n is an integer between 1 and 10, each R group is independently selected from a C2 to C5 alkylene group; R0 group is selected from a C 15 ~C 20 an alkyl, cycloalkyl or alkenyl group.

5. The industrial gear oil composition according to claim 4, characterized in that n is an integer between 1 and 5, each R group is independently selected from ethylene or propylene; R0 group is selected from C 16 ~C 18 Each R' group is independently selected from C2 to C8 alkyl, phenyl, C4 to C 10 The phenyl group substituted by a straight chain or branched alkyl group (the C4 to C 10 The straight chain or branched alkyl substituted phenyl group is preferably replaced by C4 to C 10 a phenyl group substituted with a straight-chain or branched-chain alkyl group).

6. The industrial gear oil composition according to claim 4, characterized in that In step (1), the molar ratio of CS2 to the compound represented by formula (X) is 0.8 to 1.3:1; in step (2), the molar ratio of the compound represented by formula (Y) to CS2 in step (1) is 1:0.5 to 1.

5.

7. The industrial gear oil composition according to claim 4, characterized in that In step (1), the temperature for the reaction between CS2 and the compound represented by formula (X) is 10 to 50° C., and the reaction time is 0.5 to 5 h. In step (2), the temperature for the reaction between the reaction product of step (1) and the compound represented by formula (Y) is 60 to 100° C., and the reaction time is 0.5 to 3 h.

8. The industrial gear oil composition according to any one of claims 1 to 7, characterized in that The antioxidant is selected from one or more of amine antioxidants, phenolic antioxidants, phenolic ester antioxidants and thiophenolic ester antioxidants; the extreme pressure anti-wear agent is selected from one or more of sulfided olefins, phosphates, phosphites, dialkyl dithiocarbamates and phosphate amine salts; the metal corrosion inhibitor is selected from benzotriazole derivatives and / or thiadiazole derivatives; and the lubricating base oil is selected from synthetic lubricating base oil.

9. The industrial gear oil composition according to any one of claims 1 to 7, characterized in that: The antioxidant is selected from one or more of octylbutyldiphenylamine, N-phenyl-α-naphthylamine, 2,6-di-tert-butyl-p-cresol, 3,5-di-tert-butyl-4-hydroxyphenyl methyl acrylate and methylene 4,4-thiobis-(2,6-di-tert-butylphenol); the extreme pressure anti-wear agent is selected from one or more of sulfided isobutylene, tricresyl phosphate, acidic phosphite, diisobutyldithiocarbamate and thiophosphate complex amine salt; the metal corrosion inhibitor is selected from one or more of N,N'-di-n-butylaminomethylenebenzotriazole, benzotriazole derivatives and thiadiazole polymer derivatives; and the lubricating base oil is selected from polyol esters and / or poly-α-olefin copolymers.

10. The industrial gear oil composition according to any one of claims 1 to 7, characterized in that: By mass, the imidazoline derivative accounts for 0.01% to 1% of the total mass of the industrial gear oil composition; the antioxidant accounts for 0.01% to 10% of the total mass of the industrial gear oil composition; the extreme pressure anti-wear agent accounts for 0.1% to 10% of the total mass of the industrial gear oil composition; the metal corrosion inhibitor accounts for 0.01% to 5% of the total mass of the industrial gear oil composition; and the lubricating base oil constitutes the main component of the industrial gear oil composition.

11. A method for preparing the industrial gear oil composition according to any one of claims 1 to 10, comprising the step of mixing the components thereof.

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