Worm and gear oil composition and preparation method thereof

Abstract

The invention provides a worm and gear oil composition and a preparation method thereof. The worm and gear oil composition comprises: (a) an imidazoline derivative; (b) a sulfur-containing extreme pressure anti-wear agent and / or a phosphorus-containing anti-wear agent; (c) a friction modifier; (d) a demulsifying agent; (e) lubricating base oil; wherein the structure of the imidazoline derivative is shown as a formula (I): # imgabs0 #, wherein the definition of each group is shown in the specification. The worm and gear oil composition disclosed by the invention has excellent oxidation stability, extreme pressure antiwear property, antifriction property, demulsibility and corrosion and rust resistance, can be blended into oil products with different viscosity grades such as N100, N150, N220, N320 and N460, and is applied to lubrication of various worm and gear gearboxes.

Description

Technical Field

[0001] The present invention relates to the field of lubricating oils, and particularly to a worm and worm gear oil composition and a preparation method thereof. Background Art

[0002] In 1948, the American Petroleum Institute (API) included worm and worm gear oil in the classification of transmission lubricating oils. The research on worm and worm gear oil in China started in 1977. At present, worm and worm gear oil is divided into two major categories: ordinary type (L-CKE) and extreme pressure type (L-CKE / P). The quality indexes of ordinary worm and worm gear oil refer to the MIL-L-15019E specification, while the quality indexes of extreme pressure worm and worm gear oil refer to the MIL-L-18486B (OS) specification.

[0003] Worm and worm gear transmission is one of the types of gear transmission. Due to its characteristics of small volume, large transmission speed ratio, stable operation, low noise, and large output torque of the worm gear, it has been widely used. Worm and worm gear pairs are mostly matched with bronze, brass worm gears and steel worms. Worm lubrication has a crucial impact on worm and worm gear transmission, which can reduce friction and wear, and improve the transmission efficiency and service life of the worm gear pair. Therefore, worm and worm gear oil should have good anti-friction, extreme pressure anti-wear, anti-corrosion and rust prevention, thermal oxidation stability, and anti-emulsification properties. Due to the relatively large sliding between the tooth surfaces and the relatively long contact time of the tooth surfaces in worm transmission compared with gear transmission, the friction and wear situation is prominent, and the oil product is required to have high comprehensive performance.

[0004] There is still room for improvement in the anti-friction performance, extreme pressure anti-wear performance, antioxidant performance, etc. of the existing worm and worm gear oil to adapt to the development trend of excellent comprehensive performance of worm and worm gear oil. Summary of the Invention

[0005] The present invention provides a worm and worm gear oil composition and a preparation method thereof.

[0006] The worm and worm gear oil composition of the present invention includes: (a) an imidazoline derivative; (b) a sulfur-containing extreme pressure anti-wear agent and / or a phosphorus-containing anti-wear agent; (c) a friction modifier; (d) an anti-emulsifier; (e) a lubricating base oil; wherein the structure of the imidazoline derivative is shown in formula (I):

[0007]

[0008] In formula (I), n is an integer between 1 and 10, and each R group is independently selected from C2-C5 alkylene groups; the R0 group is selected from C 15 -C 20 alkyl, cycloalkyl or alkenyl groups; each R' group is independently selected from C1-C 20 alkyl groups, C6-C 10 aryl groups, groups substituted by C1-C10 a linear or branched alkyl-substituted C6-C 10 aryl.

[0009] According to the present invention, the R0 group may be C 15 -C 20 alkyl, or may be C 15 -C 20 cycloalkyl, or may also be C 15 -C 20 alkenyl. The C 15 -C 20 alkenyl may be a group containing one or more carbon-carbon double bonds within the group and having an alkyl group at the end of the group, or may be a group having a carbon-carbon double bond at the end of the group, or may also be a group containing one or more carbon-carbon double bonds within the group and having a carbon-carbon double bond at the end of the group.

[0010] According to the present invention, preferably, in formula (I), n is an integer between 1 and 5 (for example, it may be 1, 2, 3, 4, or 5), each R group is independently selected from ethylene or propylene; the R0 group is selected from C 16 -C 18 alkyl or alkenyl; each R' group is independently selected from C2-C8 alkyl, phenyl, phenyl substituted by a linear or branched alkyl of C4-C 10 . The phenyl substituted by a linear or branched alkyl of C4-C 10 is preferably a phenyl substituted by a linear or branched alkyl of C4-C 10 at the para position, such as p-butylphenyl, p-isooctylphenyl, p-nonylphenyl.

[0011] According to the present invention, the imidazoline derivative may be one or more of the following compounds:

[0012]

[0013]

[0014] According to the present invention, the preparation method of the imidazoline derivative comprises the following steps:

[0015] (1) React CS2 with the compound represented by formula (X);

[0016]

[0017] wherein each R' group is independently selected from C1-C 20 alkyl, C6-C 10 aryl, aryl substituted by a linear or branched alkyl of C1-C 10 and having C6-C 10 aryl;

[0018] (2) React the reaction product of step (1) with the compound represented by formula (Y), and collect the product;

[0019]

[0020] wherein n is an integer between 1 and 10, and each R group is independently selected from C2-C5 alkylene groups; the R0 group is selected from C 15 -C 20 alkyl, cycloalkyl or alkenyl.

[0021] According to the present invention, preferably, n is an integer between 1 and 5 (for example, it can be 1, 2, 3, 4 or 5), and each R group is independently selected from ethylene or propylene groups; the R0 group is selected from C 16 -C 18 alkyl or alkenyl; each R' group is independently selected from C2-C8 alkyl, phenyl, phenyl substituted by a C4-C 10 linear or branched alkyl. The phenyl substituted by a C4-C 10 linear or branched alkyl is preferably a phenyl substituted by a C4-C 10 linear or branched alkyl at the para position, such as p-butylphenyl, p-isooctylphenyl, p-nonylphenyl.

[0022] According to the present invention, in step (1), the reaction formula between CS2 and the compound represented by formula (X) is as follows.

[0023]

[0024] 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.

[0025]

[0026] According to the present invention, in step (1), the molar ratio between CS2 and the compound represented by formula (X) can be 0.8-1.3:1, preferably 0.9-1.2:1; in step (2), the molar ratio between the compound represented by formula (Y) and CS2 in step (1) can be 1:0.5-1.5, preferably 1:0.8-1.2.

[0027] According to the present invention, in step (1), the temperature of 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 generally 0.5 to 5 h, preferably 0.5 to 2.5 h; in step (2), the temperature of 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 generally 0.5 to 3 h, preferably 1 to 2 h.

[0028] According to the present invention, the compound represented by formula (Y) can be prepared by first carrying out an amidation dehydration reaction and then a cyclization dehydration reaction between the compound represented by formula (α) and the compound represented by formula (β);

[0029]

[0030] wherein n is an integer between 1 and 10, and each R group is independently selected from C2-C5 alkylene groups; the R0 group is selected from C 15 -C 20 alkyl, cycloalkyl or alkenyl.

[0031] According to the present invention, preferably, n is an integer between 1 and 5 (for example, it can be 1, 2, 3, 4 or 5), each R group is independently selected from ethylene or propylene; the R0 group is selected from C 16 -C 18 alkyl or alkenyl.

[0032] 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 between the compound represented by formula (α) and the compound represented by formula (β), the temperature of the amidation dehydration reaction can be 140 to 180 °C, preferably 140 to 160 °C, the reaction time is generally 1 to 3 h, preferably 1 to 2 h, the temperature of the cyclization dehydration reaction can be 180 to 250 °C, preferably 220 to 240 °C, and the reaction time is generally 2 to 6 h, preferably 3 to 5 h.

[0033] According to the present invention, in the reaction between the compound represented by formula (α) and the compound represented by formula (β), a water-carrying agent can be added or not. The water-carrying agent can be an aromatic hydrocarbon solvent, for example, xylene can be selected.

[0034] According to the present invention, the compound represented by the formula (X) can be selected from one or more of dibutylamine, diphenylamine, 4-butyldiphenylamine, 4,4'-dibutyldiphenylamine, 4-isooctyldiphenylamine, and 4,4'-diisooctyldiphenylamine; the compound represented by the formula (α) can be selected from one or more of diethylenetriamine, triethylenetetramine, tetraethylenepentamine, and pentaethylenehexamine; the compound represented by the formula (β) can be selected from one or more of palmitic acid, stearic acid, oleic acid, and linoleic acid.

[0035] According to the present invention, in step (2), the reaction product of step (1) and the compound represented by the formula (Y) contains the main product of the imidazoline derivative and a small amount of by-products. Since these by-products can be used as additives themselves, in step (2), these by-products can be separated out, 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 through purification or separation methods, such as vacuum distillation, molecular distillation, column chromatography, or preparative chromatography.

[0036] The imidazoline derivative of the present invention has excellent antioxidant ability and metal corrosion prevention ability, can improve the anti-aging and antioxidant ability of oil products, and significantly improve the corrosion of polar additives in oil products to the metal surface.

[0037] According to the present invention, based on the total weight of the worm gear oil composition being 100%, the content of the component (a) imidazoline derivative is preferably 0.01% to 1%, more preferably 0.05% to 0.8%.

[0038] According to the present invention, the sulfur-containing extreme pressure anti-wear agent in the component (b) can be selected from one or more of sulfurized olefins, dibenzyl disulfide, and alkyl polysulfides, more preferably sulfurized isobutene, such as domestic T321 and Anglamol-33 of Lubrizol Company; the phosphorus-containing anti-wear agent in the component (b) can be selected from one or more of amine salts of phosphate esters, nitrogen-containing derivatives of thiophosphoric acid, amine salts of thiophosphoric acid diesters, and phosphate esters, more preferably one or more of octyl phosphate stearylamine salt, triphenyl thiophosphate, and tricresyl phosphate, and common commercial brand names include T308, T306, T309, etc. Based on the total weight of the worm gear oil composition being 100%, the content of the component (b) is preferably 0.1% to 4%, more preferably 0.3% to 2.5%.

[0039] According to the present invention, the component (c) friction improver can be selected from one or more of sulfurized animal and vegetable oils, benzotriazole fatty amine salts, fatty alcohol esters, and phosphate esters, such as one or more of sulfurized olefin cottonseed oil, benzotriazole octadecylamine salt, ethylene glycol oleate, and phosphate esters. Common commercial brand names are such as T405, T406, T403, T451, etc. Based on the total weight of the worm and worm gear oil composition being 100%, the content of the component (c) is preferably 0.03% to 1.5%, more preferably 0.1% to 1%.

[0040] According to the present invention, the component (d) demulsifier can be selected from polyol ether type demulsifiers. For example, condensates of amines and ethylene oxide can be selected. Common commercial brand names are such as T1001. Based on the total weight of the worm and worm gear oil composition being 100%, the content of the component (d) is preferably 0.01% to 0.5%, more preferably 0.01% to 0.2%.

[0041] According to the present invention, the component (e) lubricating base oil can be selected from mineral lubricating base oils or / and synthetic lubricating base oils. The mineral lubricating base oil is preferably selected from paraffinic lubricating base oils and / or intermediate base lubricating base oils. For example, one or more of 100SN, 150SN, 200SN, 250SN, 350SN, 500SN, 650SN, 90BS, 120BS, 150BS, 150ZN, 600ZN, and 140ZNZ can be selected. The synthetic lubricating base oil can be selected from one or more of synthetic esters, synthetic hydrocarbons, and polyalkylene glycols, more preferably synthetic esters and / or polyalpha-olefins (PAO). The kinematic viscosity of the lubricating base oil can be freely adjusted according to the usage requirements and there is no particular limitation. Viscosity index improvers and / or pour point depressants well-known to those skilled in the art can be added to the lubricating base oil to formulate lubricating base oils of different viscosity grades. For example, polymethacrylate viscosity index improvers and / or polyalpha-olefin pour point depressants can be selected. Usually, the 100 °C kinematic viscosity of the synthetic lubricating oil is 3 to 100 mm 2 / s, preferably 3 to 50 mm 2 / s, or the 40 °C kinematic viscosity is 10 to 2000 mm 2 / s, preferably 10 to 800 mm 2 / s. Generally, lubricating base oils of multiple viscosities are selected to formulate lubricating base oils of different viscosity grades. The viscosity grades include N100, N150, N220, N320, N460, etc. The component (e) constitutes the main component of the worm and worm gear oil composition.

[0042] The preparation method of the worm and worm gear oil composition of the present invention includes the step of mixing the components in the worm and worm gear oil composition described above. The mixing temperature is preferably 40 to 90 °C, and the mixing time is preferably 1 to 2 h.

[0043] The worm and worm gear oil composition of the present invention has excellent oxidation stability, extreme pressure and anti-wear properties, friction reduction properties, anti-emulsification properties, and anti-corrosion and rust prevention properties, and can be formulated into oils with different viscosity grades such as N100, N150, N220, N320, N460, etc. and applied to the lubrication of various worm and worm gear boxes. Detailed implementation mode

[0044] The present invention will be further described below through examples, but it does not constitute a limitation to the present invention.

[0045] The main raw materials used are as follows:

[0046] Di-n-butylamine, Zhejiang Jiande Jianye Organic Chemical Co., Ltd., 99%

[0047] Carbon disulfide, Sinopharm Chemical Reagent Co., Ltd., analytical pure

[0048] Oleic acid, Beijing Innochem Science & Technology Co., Ltd., analytical pure

[0049] Linoleic acid, Beijing Innochem Science & Technology Co., Ltd., analytical pure

[0050] Diethylenetriamine, Tianjin Beilian Fine Chemical Co., Ltd., 98%

[0051] Dodecenyl succinic acid, Shandong Nengju Chemical Co., Ltd., industrial grade

[0052] 4-Butyldiphenylamine, Beijing Innochem Science & Technology Co., Ltd., 97%

[0053] Sulphurized isobutene, T321, Liaoning Tianhe Fine Chemical Co., Ltd., industrial grade

[0054] Octyl phosphate octadecylamine salt, T308, Shenyang Weihua Chemical Oil Products Co., Ltd., industrial grade

[0055] Sulphurized olefin cottonseed oil, T405, Changsha Wangcheng Petrochemical Co., Ltd., industrial grade

[0056] Benzotriazole octadecylamine salt, T406, Zibo Huihua Chemical Co., Ltd., industrial grade

[0057] Amine and ethylene oxide condensate, T1001, Danyang Tianyu Petroleum Additive Factory, industrial grade

[0058] Polyalphaolefin oil (PAO), Shanghai Nake Lubrication Technology Co., Ltd., industrial grade

[0059] Diisooctyl sebacate, Shanghai Nake Lubrication Technology Co., Ltd., industrial grade

[0060] HVI 100SN mineral oil, HVI 120BS mineral oil, Maoming Petrochemical, industrial products

[0061] Polymethacrylate viscosity index improver T602, polyalpha-olefin pour point depressant T803, Wuxi Nanfang Petroleum Additive Co., Ltd., industrial products

[0062] Lubricating base oil F-1, including 25% diisooctyl sebacate, 75% polyalpha-olefin oil (PAO20), and additionally 1.6% of T602 based on the sum of the masses of the two

[0063] Lubricating base oil F-2, including 17% diisooctyl sebacate, 83% polyalpha-olefin oil (PAO40), and additionally 0.4% of T803 based on the sum of the masses of the two

[0064] Lubricating base oil F-3, including 32% HVI 100SN mineral oil and 68% HVI 120BS mineral oil, and additionally 1.0% of T803 and 0.9% of T602 based on the total mass of the above mineral oil mixture

[0065] Comparative antioxidant T512, Xingpu Company, Research Institute of Petroleum Processing, industrial products

[0066] Comparative rust inhibitor T706, Nanjing Jinling Chemical Synthetic Reagent Factory, industrial products

[0067] Comparative metal deactivator T551, Xingpu Company, Research Institute of Petroleum Processing, industrial products Example 1

[0068] (1) Charge 113 g of diethylenetriamine into the reaction kettle. At 90 °C, add 282 g of oleic acid dropwise into the reaction kettle. Raise the temperature to 160 °C for amidation dehydration. After 18 ml of water is removed, raise the temperature to 240 °C and continue cyclization dehydration. After another 18 mL of water is removed, stop the reaction to obtain the hydrocarbyl-substituted imidazoline.

[0069]

[0070] (2) React 129 g of di-n-butylamine with 76 g of carbon disulfide in 100 mL of water. The reaction temperature is 20 °C and the reaction time is 2 hours to form the dithiocarbamate intermediate.

[0071]

[0072] (3) Add the hydrocarbyl-substituted imidazoline obtained in step (1) to the dithiocarbamate intermediate obtained in step (2). React at 80 °C for 2 hours to remove hydrogen sulfide to obtain the imidazoline derivative of the present invention.

[0073]

[0074] In the product of Example 1, it includes the above-mentioned imidazoline derivative main product and a small amount of alkyl-substituted imidazoline by-products, uncyclized oleamide by-products, by-products of the continued amidation reaction of alkyl-substituted imidazoline and oleic acid, and by-products of the continued amidation reaction of uncyclized oleamide and oleic acid. Since these by-products can all be used as lubricating oil additives, it is not necessary to separate these by-products in this example. Those skilled in the art can obtain pure imidazoline derivatives through well-known purification or separation methods.

[0075] Example 2

[0076] (1) Charge 113 g of diethylenetriamine into a reaction kettle. At 90 °C, add 280 g of linoleic acid dropwise into the reaction kettle. Raise the temperature to 160 °C for amidation dehydration. After 18 ml of water is removed, raise the temperature to 240 °C for continued cyclization dehydration. After another 18 mL of water is removed, stop the reaction to obtain alkyl-substituted imidazoline.

[0077] (2) React 129 g of di-n-butylamine with 76 g of carbon disulfide in 100 mL of water. The reaction temperature is 20 °C and the reaction time is 2 hours to generate a dithiocarbamate intermediate.

[0078] (3) Add the alkyl-substituted imidazoline obtained in step (1) to the dithiocarbamate intermediate obtained in step (2). React at 80 °C for 2 hours to remove hydrogen sulfide to obtain the imidazoline derivative of the present invention.

[0079] Its structure is as follows.

[0080]

[0081] Example 3

[0082] (1) Charge 113 g of diethylenetriamine into a reaction kettle. At 90 °C, add 282 g of oleic acid dropwise into the reaction kettle. Raise the temperature to 160 °C for amidation dehydration. After 18 ml of water is removed, raise the temperature to 240 °C for continued cyclization dehydration. After another 18 mL of water is removed, stop the reaction to obtain alkyl-substituted imidazoline.

[0083] (2) React 226 g of 4-butyldiphenylamine with 76 g of carbon disulfide in 100 mL of water. The reaction temperature is 20 °C and the reaction time is 2 hours to generate a dithiocarbamate intermediate.

[0084] (3) Add the alkyl-substituted imidazoline obtained in step (1) to the dithiocarbamate intermediate obtained in step (2). React at 80 °C for 2 hours to remove hydrogen sulfide to obtain the imidazoline derivative of the present invention.

[0085] Its structure is as follows.

[0086]

[0087] Examples 4 to 6 and Comparative Examples 1 to 3 of the worm and worm gear oil composition

[0088] The formulation compositions of Examples 4 to 6 and Comparative Examples 1 to 3 of the worm and worm gear oil composition are shown in Table 1. Each component was added to a blending container in proportion and stirred at 50 °C for 2 hours to prepare Examples 4 to 6 and Comparative Examples 1 to 3 of the worm and worm gear oil composition, respectively.

[0089] The kinematic viscosity, viscosity index, copper strip corrosion, liquid phase rusting, demulsibility, antioxidant property, and extreme pressure and antiwear property tests were carried out on these worm and worm gear oil compositions respectively. The test methods and test results are shown in Table 2.

[0090] Table 1

[0091]

[0092] Table 2

[0093]

Claims

1. A worm gear oil composition, comprising: (a) Imidazoline derivatives; (b) sulfur-containing extreme pressure and anti-wear agents and / or phosphorus-containing anti-wear agents; (c) friction improvers; (d) anti-emulsifiers; (e) lubricating base oils; wherein the structure of the imidazoline derivatives is shown in formula (I): In formula (I), n is an integer between 1 and 10, and each R group is independently selected from C2-C5 alkylene groups; the R0 group is selected from C 15 -C 20 alkyl, cycloalkyl or alkenyl groups; each R' group is independently selected from C1-C 20 alkyl, C6-C 10 aryl, or C6-C 10 aryl substituted with a C1-C 10 linear or branched alkyl group.

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

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

4. The worm and worm gear oil composition according to claim 1, characterized in that, The preparation method of the imidazoline derivatives comprises the following steps: (1) React CS₂ with the compound shown in formula (X); wherein the R' groups are each independently selected from alkyl groups having 1 to 20 carbons, aryl groups having 6 to 10 carbons, aryl groups having 6 to 10 carbons which are substituted by a straight-chain or branched alkyl group having 1 to 10 carbons; (2) React the reaction product of step (1) with the compound shown in formula (Y), and collect the product; Wherein n is an integer between 1 and 10, and each R group is independently selected from C2-C5 alkylene groups; the R0 group is selected from C 15 -C 20 alkyl, cycloalkyl or alkenyl groups.

5. The worm and worm gear oil composition according to claim 4, characterized in that, n is an integer between 1 and 5, and each R group is independently selected from ethylene or propylene; the R0 group is selected from C 16 ~C 18 alkyl or alkenyl; each R' group is independently selected from C2-C8 alkyl, phenyl, phenyl substituted by a straight-chain or branched-chain alkyl of C4-C 10 (the phenyl substituted by a straight-chain or branched-chain alkyl of C4-C 10 is preferably phenyl substituted at the para position by a straight-chain or branched-chain alkyl of C4-C 10 (the phenyl substituted by a straight-chain or branched-chain alkyl of C4-C 6. The worm gear oil composition according to claim 4, characterized in that, In step (1), the molar ratio between CS₂ and the compound shown in formula (X) is 0.8 - 1.3:1; in step (2), the molar ratio between the compound shown in formula (Y) and CS₂ in step (1) is 1:0.5 - 1.

5.

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

8. The worm gear oil composition according to claim 4, characterized in that, The compound shown in formula (Y) is prepared by first carrying out an amidation dehydration reaction between the compound shown in formula (α) and the compound shown in formula (β), and then carrying out a cyclization dehydration reaction; Wherein n is an integer between 1 and 10, and each R group is independently selected from C2-C5 alkylene groups; the R0 group is selected from C 15 -C 20 alkyl, cycloalkyl or alkenyl groups.

9. The worm and worm gear oil composition according to any one of claims 1 to 8, characterized in that, The sulfur-containing extreme pressure and anti-wear agent in component (b) is selected from one or more of sulfurized olefins, dibenzyl disulfide and alkyl polysulfides; the phosphorus-containing anti-wear agent in component (b) is selected from one or more of amine salts of phosphate esters, nitrogen-containing derivatives of thiophosphoric acid, amine salts of thiophosphoric acid diesters and phosphate esters; the friction improver in component (c) is selected from one or more of sulfurized animal and vegetable oils, benzotriazole fatty amine salts, fatty alcohol esters and phosphate esters; the anti-emulsifier in component (d) is selected from polyol ether type anti-emulsifiers; the lubricating base oil in component (e) is selected from mineral lubricating base oils or / and synthetic lubricating base oils.

10. The worm gear oil composition according to any one of claims 1 to 8, characterized in that, Based on the total weight of the worm gear oil composition being 100%, the content of component (a) imidazoline derivatives is 0.01% - 1%; the content of component (b) is 0.1% - 4%; the content of component (c) is 0.03% - 1.5%; the content of component (d) is 0.01% - 0.5%; component (e) constitutes the main component of the worm gear oil composition.

11. The preparation method of the worm gear oil composition according to any one of claims 1 - 10, comprising the step of mixing each component therein.

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