Lubricating oil composition and method for producing the same

Abstract

This invention relates to the field of lubricating oil technology, and discloses a lubricating oil composition and its preparation method. The lubricating oil composition includes a base oil, an extreme pressure anti-wear agent, a friction modifier, and optional other additives. The extreme pressure anti-wear agent is selected from isobutylene sulfide and / or dialkyl dithiophosphates, and the friction modifier is an ammonium phosphate salt. The other additives are selected from at least one of viscosity index improvers, antioxidants, metal deactivators, dispersants, detergents, and antifoaming agents. By controlling the specific types of extreme pressure anti-wear agents and friction modifiers, better synergistic effects can be achieved between them and with other components, resulting in a lubricating oil composition with excellent anti-friction and wear properties while exhibiting excellent compatibility with silicone sealant materials.

Description

Technical Field

[0001] This invention relates to the field of lubricating oil technology, and more specifically to a lubricating oil composition and its preparation method. Background Technology

[0002] Silicone sealant is specifically designed for bonding materials in electronic and electrical equipment. It is a single-component room temperature vulcanizing silicone rubber with high bonding strength. It has excellent electrical insulation, sealing and heat dissipation properties and can be used for a long time in the range of -60℃ to 250℃. Its main functions are bonding, sealing, heat conduction and fixing.

[0003] Sealed housings or cavities, such as gearbox systems and oil-cooled electric drive systems in electric vehicles, commonly use silicone sealant for sealing and fastening. These housings and cavities require lubricating oil to lubricate and cool the components within the system, and this lubricating oil must come into contact with the silicone sealant used on the housing contact surfaces. In engineering applications, it has been found that after prolonged use, gearboxes or electric drive systems are prone to incompatibility between the lubricating oil and the silicone sealant, leading to corrosion and damage of the silicone sealant, which in turn causes housing seal failure and oil leakage.

[0004] Many types of lubricants are available, but it is difficult to simultaneously achieve excellent lubrication performance and compatibility with silicone sealants. Therefore, there is an urgent need to develop a lubricant composition that exhibits excellent performance in both lubrication and silicone sealant compatibility. Summary of the Invention

[0005] The purpose of this invention is to overcome the problem that existing lubricating oils are difficult to simultaneously satisfy excellent lubrication performance and compatibility with silicone sealants, and to provide a lubricating oil composition and its preparation method, so that the lubricating oil composition can simultaneously achieve excellent lubrication performance and compatibility with silicone sealants.

[0006] To achieve the above objectives, a first aspect of the present invention provides a lubricating oil composition comprising a base oil, an extreme pressure anti-wear agent, a friction modifier, and optional additives, wherein the extreme pressure anti-wear agent is selected from isobutylene sulfide and / or dialkyl dithiophosphate, the friction modifier is an ammonium phosphate salt, and the other additives are selected from at least one of viscosity index improvers, antioxidants, metal deactivators, dispersants, detergents, and antifoaming agents.

[0007] A second aspect of the present invention provides a method for preparing a lubricating oil composition, wherein the method includes:

[0008] After the base oil is mixed with the antifoaming agent and detergent, a viscosity index improver, extreme pressure anti-wear agent, antioxidant, friction modifier, metal deactivator and dispersant are added for a second mixing to obtain a lubricating oil composition.

[0009] Wherein, the lubricating oil composition is the lubricating oil composition described in the first aspect.

[0010] Through the above technical solution, the lubricating oil composition and its preparation method provided by the present invention achieve the following beneficial effects:

[0011] The lubricating oil composition provided by this invention employs specific components and controls the use of specific types of extreme pressure anti-wear agents and friction modifiers, enabling better synergistic effects between the two and with other components. This results in a lubricating oil composition with excellent anti-friction and wear properties, while also exhibiting excellent compatibility with silicone sealant materials. Attached Figure Description

[0012] Figure 1 This is a schematic diagram illustrating the compatibility test of the lubricating oils prepared in Examples 1-5 with Henkel Loctite SI 5970 sealant.

[0013] Figure 2 This is a schematic diagram illustrating the compatibility test of the lubricants prepared in Examples 6-7 and Comparative Example 1 with Henkel Loctite SI 5970 sealant. Detailed Implementation

[0014] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0015] The first aspect of the present invention provides a lubricating oil composition comprising a base oil, an extreme pressure anti-wear agent, a friction modifier, and optional additives, wherein the extreme pressure anti-wear agent is selected from isobutylene sulfide and / or dialkyl dithiophosphate, the friction modifier is an ammonium phosphate salt, and the other additives are selected from at least one of viscosity index improvers, antioxidants, metal deactivators, dispersants, detergents, and antifoaming agents.

[0016] According to some embodiments of the present invention, the weight ratio of the extreme pressure anti-wear agent to the friction modifier is 1:(0.009-24), preferably 1:(0.1-1).

[0017] According to some embodiments of the present invention, the extreme pressure anti-wear agent is selected from isobutylene sulfide and dialkyl dithiophosphate, wherein the weight ratio of isobutylene sulfide and dialkyl dithiophosphate is 1:(0.5-1.5).

[0018] According to some embodiments of the present invention, the total content of the extreme pressure anti-wear agent and friction modifier is 0.02-4.5 wt%, preferably 0.1-3.2 wt%, based on the total weight of the lubricating oil composition.

[0019] According to some embodiments of the present invention, the content of the other additives is 0.08-18 wt%, preferably 0.5-14 wt%, based on the total weight of the lubricating oil composition.

[0020] According to some embodiments of the present invention, the base oil content is 77.5-99.9 wt%, preferably 82.8-99.4 wt%, based on the total weight of the lubricating oil composition.

[0021] According to some embodiments of the present invention, the viscosity index improver comprises 0.1 wt%-8 wt% of the total weight of the grease composition, the extreme pressure anti-wear agent comprises 0.01 wt%-3 wt% of the total weight, the antioxidant comprises 0.01 wt%-1.6 wt% of the total weight, the friction improver comprises 0.01 wt%-1.5 wt% of the total weight, the metal deactivator comprises 0.01 wt%-1.5 wt% of the total weight, the dispersant comprises 0.01 wt%-5 wt% of the total weight, the detergent comprises 0.01 wt%-1.5 wt% of the total weight, and the antifoaming agent comprises 0.0001 wt%-0.01 wt% of the total weight, with the balance being base oil.

[0022] More preferably, based on the total weight of the lubricating oil composition, the viscosity index improver contains 0.5wt%-6wt%, the extreme pressure anti-wear agent contains 0.05wt%-2.5wt%, the antioxidant contains 0.02wt%-1.2wt%, the friction improver contains 0.02wt%-1.2wt%, the metal deactivator contains 0.02wt%-1.2wt%, the dispersant contains 0.02wt%-4wt%, the detergent contains 0.02wt%-1wt%, the antifoaming agent contains 0.0003wt%-0.008wt%, and the balance is base oil.

[0023] According to some embodiments of the present invention, the base oil is selected from at least one of mineral base oil, hydrogenated base oil, polyalphaolefin synthetic base oil, polyol ester synthetic base oil, polyalkylene glycol and diester synthetic base oil.

[0024] According to some embodiments of the present invention, the kinematic viscosity of the base oil at 100°C is 2-7 mm. 2 / s. The test method for "kinematic viscosity" is GB / T 265-1988.

[0025] According to some embodiments of the present invention, the viscosity index improver is selected from at least one of polyalphaolefin, polymethacrylate, styrene-butadiene copolymer, styrene polyester and poly(n-butyl vinyl ether).

[0026] According to some embodiments of the present invention, the viscosity index improver has a weight-average molecular weight of 300-2000 g / mol, preferably 500-1500 g / mol.

[0027] According to some embodiments of the present invention, the antioxidant is selected from phenolic antioxidants and / or amine antioxidants.

[0028] According to some embodiments of the present invention, the antioxidant is selected from phenolic antioxidants and amine antioxidants.

[0029] According to some embodiments of the present invention, the weight ratio of the phenolic antioxidant to the amine antioxidant is 1:(0.1-5), preferably 1:(0.5-3).

[0030] According to some embodiments of the present invention, the phenolic antioxidant is 2,6-di-tert-butyl-p-cresol.

[0031] According to some embodiments of the present invention, the amine antioxidant is selected from octyldiphenylamine and / or N-phenyl-α-naphthylamine.

[0032] According to some embodiments of the present invention, the metal deactivator is selected from methyltriazole and / or thiadiazole derivatives.

[0033] According to some embodiments of the present invention, the dispersant is selected from succinimide polymers and / or succinate polymers.

[0034] According to some embodiments of the present invention, the detergent is selected from petroleum sulfonates and / or synthetic sulfonates.

[0035] In this invention, the petroleum sulfonate is preferably calcium petroleum sulfonate, and the synthetic sulfonate is preferably synthetic calcium sulfonate.

[0036] According to some embodiments of the present invention, the antifoaming agent is selected from methyl silicone oil and / or acrylate copolymers.

[0037] According to a preferred embodiment of the present invention, the lubricating oil composition consists only of the above-mentioned components.

[0038] According to a preferred embodiment of the present invention, a lubricating oil composition with superior performance can be obtained by combining preferred types of base oil, extreme pressure anti-wear agent, friction modifier, viscosity index modifier, antioxidant, metal deactivator, dispersant, detergent and antifoaming agent in preferred proportions.

[0039] In this invention, the lubricating oil composition can be obtained by mixing the various components. However, in order to obtain a lubricating oil composition with uniform and stable dispersion, a second aspect of this invention provides a method for preparing a lubricating oil composition, wherein the method includes:

[0040] After the base oil is mixed with the antifoaming agent and detergent, a viscosity index improver, extreme pressure anti-wear agent, antioxidant, friction modifier, metal deactivator and dispersant are added for a second mixing to obtain a lubricating oil composition.

[0041] Wherein, the lubricating oil composition is the lubricating oil composition described in the first aspect.

[0042] According to a preferred embodiment of the present invention, the conditions for the first mixing include: a temperature of 30-100°C, preferably 40-80°C; and a time of 0.1-1h, preferably 0.3-0.7h.

[0043] According to a preferred embodiment of the present invention, the conditions for the second mixing include: a temperature of 0-75°C, preferably 20-50°C; and a time of 2-6 hours, preferably 3-5 hours.

[0044] According to a particularly preferred embodiment of the present invention, a lubricating oil is provided, the lubricating oil composition comprising a base oil, an extreme pressure anti-wear agent, a friction modifier, and optional other additives, wherein the extreme pressure anti-wear agent is selected from isobutylene sulfide and dialkyl dithiophosphate, the friction modifier is selected from ammonium phosphate salts, and the other additives are selected from at least one of viscosity index improvers, antioxidants, metal deactivators, dispersants, detergents, and antifoaming agents.

[0045] The base oil is selected from mineral hydrogenated base oil and / or polyol ester synthetic base oil; the kinematic viscosity (100℃) of the base oil is 4-6 mm. 2 / s; the weight ratio of the extreme pressure anti-wear agent to the friction modifier is 1:(0.2-0.5); the weight ratio of the antioxidant (2,6-di-tert-butyl-p-cresol and octyl diphenylamine is 1:0.8-1.2).

[0046] The present invention will be described in detail below through embodiments. In the following embodiments,

[0047] The sulfurized isobutylene in the extreme pressure anti-wear agent was purchased from Kunhou Additives Co., Ltd., model T321.

[0048] The sulfurized fat was purchased from Lanxess Additives, model RC2535;

[0049] Dialkyl dithiophosphate was purchased from Jilin Yafeng, model 353;

[0050] The phosphonate ester in the friction modifier was purchased from Vanderbilt, model Vanlube 672;

[0051] Ethylene oleate was purchased from Sinopec, type E3;

[0052] Ammonium phosphate salt was purchased from Lanzhou Borun Additives Co., Ltd., model T308;

[0053] The mineral hydrotreated base oils were purchased from Sinopec, and were of grades HVI II+3, HVI III4 and HVI III6.

[0054] The polyalphaolefin synthetic base oil was purchased from Sinopec, type 4;

[0055] Polyol ester synthetic base oil was purchased from BASF, model number: ES 4007;

[0056] Polyalkylene glycol was purchased from Clariant, model Polyglykol;

[0057] Diester synthetic base oil was purchased from Sinopec, type 5906;

[0058] The polymethyl methacrylate was purchased from Evonik Additives, model Vx 12-800;

[0059] The styrene-butadiene copolymer was purchased from Infineon Additives, model SV206.

[0060] The styrene polyester was purchased from Sinopec, grade 39.

[0061] The poly(n-butylvinyl ether) was purchased from Lanzhou Refining & Chemical Company, model T601.

[0062] Methyltriazole was purchased from Vanderbilt, model Cuvan 303;

[0063] The thiadiazole derivative was purchased from Changsha Wangcheng Petrochemical Co., Ltd., model T561.

[0064] Calcium petroleum sulfonate was purchased from Hairun Additives Co., Ltd., model T101.

[0065] The synthetic calcium sulfonate was purchased from Hairun Additives Co., Ltd., model T106.

[0066] Example 1

[0067] This embodiment is used to illustrate the lubricating oil composition and its preparation method of the present invention.

[0068] The lubricating oil composition consists of the following raw materials: viscosity index improver (polymethacrylate, weight average molecular weight 1000 g / mol) 3 wt%, extreme pressure anti-wear agent (dialkyl dithiophosphate) 0.6 wt%, antioxidant (2,6-di-tert-butyl-p-cresol and octyl diphenylamine in a weight ratio of 1:2) 1.6 wt%, friction modifier (ammonium phosphate salt) 0.8 wt%, metal deactivator (methyltriazole) 0.1 wt%, dispersant (succinimide polymer) 2.5 wt%, detergent (calcium petroleum sulfonate) 0.8 wt%, and antifoaming agent (methyl silicone oil) 0.001 wt%, with the balance being base oil (mineral hydrotreated base oil HVI III4 with a kinematic viscosity of 5 mmHg at 100°C). 2 / s), wherein the weight ratio of extreme pressure anti-wear agent to friction modifier is 1:1.333.

[0069] The base oil, antifoaming agent, and detergent are first mixed at 40°C for 1 hour, and then a viscosity index improver, extreme pressure anti-wear agent, antioxidant, friction modifier, metal deactivator, and dispersant are added and the mixture is second mixed at 35°C for 4 hours to obtain a lubricating oil composition.

[0070] Example 2

[0071] This embodiment is used to illustrate the lubricating oil composition and its preparation method of the present invention.

[0072] The lubricating oil composition consists of the following raw materials: viscosity index improver (polymethacrylate, weight average molecular weight 1500 g / mol) 3 wt%, extreme pressure anti-wear agent (dialkyl dithiophosphate) 0.05 wt%, antioxidant (2,6-di-tert-butyl-p-cresol and octyl diphenylamine in a weight ratio of 1:1) 1.6 wt%, friction modifier (ammonium phosphate salt) 1.2 wt%, metal deactivator (methyltriazole) 0.1 wt%, dispersant (succinimide polymer) 2.5 wt%, detergent (calcium petroleum sulfonate) 0.8 wt%, and antifoaming agent (methyl silicone oil) 0.001 wt%, with the balance being base oil (mineral hydrotreated base oil HVI III6 with a kinematic viscosity of 7 mm at 100°C). 2 / s), wherein the weight ratio of extreme pressure anti-wear agent to friction modifier is 1:24.

[0073] The base oil, antifoaming agent, and detergent are first mixed at 100°C for 1 hour, and then a viscosity index improver, extreme pressure anti-wear agent, antioxidant, friction modifier, metal deactivator, and dispersant are added and the mixture is second mixed at 50°C for 3 hours to obtain a lubricating oil composition.

[0074] Example 3

[0075] This embodiment is used to illustrate the lubricating oil composition and its preparation method of the present invention.

[0076] The lubricating oil composition consists of the following raw materials: viscosity index improver (polymethacrylate, weight average molecular weight 500 g / mol) 3 wt%, extreme pressure anti-wear agent (dialkyl dithiophosphate) 2.2 wt%, antioxidant (2,6-di-tert-butyl-p-cresol and octyl diphenylamine in a weight ratio of 1:2) 1.6 wt%, friction modifier (ammonium phosphate salt) 0.02 wt%, metal deactivator (methyltriazole) 0.1 wt%, dispersant (succinimide polymer) 2.5 wt%, detergent (calcium petroleum sulfonate) 0.8 wt%, and antifoaming agent (methyl silicone oil) 0.001 wt%. The balance is base oil (polyalphaolefin synthetic base oil with a kinematic viscosity of 5 mmHg at 100°C). 2 / s), wherein the weight ratio of extreme pressure anti-wear agent to friction modifier is 1:0.009.

[0077] The base oil, antifoaming agent, and detergent are first mixed at 50°C for 0.5 hours, and then a viscosity index improver, extreme pressure anti-wear agent, antioxidant, friction modifier, metal deactivator, and dispersant are added and the mixture is second mixed at 20°C for 5 hours to obtain a lubricating oil composition.

[0078] Example 4

[0079] This embodiment is used to illustrate the lubricating oil composition and its preparation method of the present invention.

[0080] The lubricating oil composition consists of the following raw materials: viscosity index improver (polymethacrylate, weight average molecular weight 2000 g / mol) 3 wt%, extreme pressure anti-wear agent (sulfurized isobutylene and dialkyl dithiophosphate in a weight ratio of 1:1) 2.2 wt%, antioxidant (2,6-di-tert-butyl-p-cresol and octyl diphenylamine in a weight ratio of 1:1) 1.6 wt%, friction modifier (ammonium phosphate salt) 0.5 wt%, metal deactivator (methyltriazole) 0.1 wt%, amine polymerization dispersant (succinimide polymer) 2.5 wt%, detergent (calcium petroleum sulfonate) 0.8 wt%, and antifoaming agent (methyl silicone oil) 0.001 wt%, with the balance being base oil (polyol ester synthetic base oil with a kinematic viscosity of 6 mmHg at 100°C). 2 / s), wherein the weight ratio of extreme pressure anti-wear agent to friction modifier is 1:0.227.

[0081] The base oil, antifoaming agent, and detergent are first mixed at 40°C for 1 hour, and then a viscosity index improver, extreme pressure anti-wear agent, antioxidant, friction modifier, metal deactivator, and dispersant are added and the mixture is second mixed at 75°C for 2 hours to obtain a lubricating oil composition.

[0082] Example 5

[0083] This embodiment is used to illustrate the lubricating oil composition and its preparation method of the present invention.

[0084] The lubricating oil composition consists of the following raw materials: viscosity index improver (polymethacrylate, weight average molecular weight 300 g / mol) 3 wt%, extreme pressure anti-wear agent (sulfurized isobutylene) 1 wt%, antioxidant (2,6-di-tert-butyl-p-cresol and octyl diphenylamine in a weight ratio of 1:2) 1.6 wt%, friction modifier (ammonium phosphate salt) 1.2 wt%, metal deactivator (methyltriazole) 0.1 wt%, dispersant (succinimide polymer) 2.5 wt%, detergent (calcium petroleum sulfonate) 0.8 wt%, and antifoaming agent (methyl silicone oil) 0.001 wt%, with the balance being base oil (polyalkylene glycol with a kinematic viscosity of 6 mmHg at 100°C). 2 / s), wherein the weight ratio of extreme pressure anti-wear agent to friction modifier is 1:1.2.

[0085] The base oil, antifoaming agent, and detergent are first mixed at 40°C for 1 hour, and then a viscosity index improver, extreme pressure anti-wear agent, antioxidant, friction modifier, metal deactivator, and dispersant are added and the mixture is second mixed at 35°C for 4 hours to obtain a lubricating oil composition.

[0086] Example 6

[0087] The lubricating oil composition was prepared according to the method of Example 4, except that the metal deactivator (methylbenztriazole) was replaced with a metal deactivator (benztriazole).

[0088] Example 7

[0089] The lubricating oil composition was prepared according to the method of Example 4, except that the friction modifier (ammonium phosphate salt) was replaced with 0.0001 wt% of friction modifier (ammonium phosphate salt), wherein the weight ratio of extreme pressure anti-wear agent to friction modifier was 1:0.00005.

[0090] Comparative Example 1

[0091] The lubricating oil composition was prepared according to the method of Example 4, except that extreme pressure anti-wear agents (sulfide isobutylene and dialkyl dithiophosphate) were not added.

[0092] Test case

[0093] The test method for silicone sealant compatibility is as follows: Apply the silicone sealant (Henkel Loctite SI 5970 sealant) according to... Figure 1Standard samples were prepared, and then the silicone sealant and the lubricating oil compositions prepared in the examples and comparative examples were subjected to oil resistance tests. The test temperature was 150℃, and the immersion time was 600h. After immersion, the silicone sealant was tested for elongation at break (the greater the change rate, the worse the effect), tensile strength change rate (the greater the change rate, the worse the effect), and hardness according to NB / SH / T 0877-2014 "Determination of Rubber Compatibility of Lubricating Oils". The wear scar diameter was measured according to NB / SH / T 0189. The test results are shown in Table 1.

[0094] Table 1

[0095]

[0096]

[0097] Figure 1 This is a schematic diagram illustrating the compatibility test of the lubricating oils prepared in Examples 1-5 with Henkel Loctite SI 5970 sealant. Figure 1 As can be seen, the lubricants prepared in Examples 1-5 did not show any obvious damage to the appearance of Henkel Loctite SI 5970 sealant after testing.

[0098] Figure 2 This is a schematic diagram illustrating the compatibility test of the lubricants prepared in Examples 6-7 and Comparative Example 1 with Henkel Loctite SI 5970 sealant. Figure 2 It can be seen that the lubricating oils prepared in Examples 6-7 showed obvious damage after testing with Henkel Loctite SI 5970 sealant; the lubricating oils prepared in Comparative Example 1 also showed obvious damage after testing with Henkel Loctite SI 5970 sealant.

[0099] As can be seen from the results in Table 1, the lubricating oil obtained by using the technical solution of the present invention, by using specific components and by controlling the use of specific types of extreme pressure anti-wear agents and friction modifiers, can exert a better synergistic effect between the two and with other components, so that the resulting lubricating oil composition has excellent anti-friction and wear performance and excellent compatibility with silicone sealant materials. Examples 1-5 have excellent anti-friction and wear performance and excellent compatibility with silicone sealant materials.

[0100] A comparison of Example 4 with Examples 6-7 shows that the lubricating oil prepared using the preferred method has excellent anti-friction and wear properties, while also exhibiting excellent compatibility with silicone sealant materials.

[0101] Compared to Example 4, Comparative Example 1 did not include an extreme pressure anti-wear agent, resulting in a decrease in the anti-friction and wear properties of the prepared lubricating oil and its compatibility with silicone sealant materials.

[0102] The preferred embodiments of the present invention have been described in detail above; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combinations of various technical features in any other suitable manner. These simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A lubricating oil composition comprising a base oil, an extreme pressure anti-wear agent, a friction modifier, and optionally other additives, characterized in that, The extreme pressure anti-wear agent is selected from isobutylene sulfide and / or dialkyl dithiophosphate, and the friction modifier is an ammonium phosphate salt; the other additives are selected from at least one of viscosity index improvers, antioxidants, metal deactivators, dispersants, detergents and antifoaming agents.

2. The lubricating oil composition according to claim 1, wherein, The weight ratio of the extreme pressure anti-wear agent to the friction modifier is 1:(0.009-24), preferably 1:(0.1-1); And / or, the extreme pressure anti-wear agent is selected from isobutylene sulfide and dialkyl dithiophosphate, wherein the weight ratio of isobutylene sulfide and dialkyl dithiophosphate is 1:(0.5-1.5); And / or, based on the total weight of the lubricating oil composition, the total content of the extreme pressure anti-wear agent and friction modifier is 0.02-4.5 wt%, preferably 0.1-3.2 wt%; And / or, based on the total weight of the lubricating oil composition, the content of the other additives is 0.08-18 wt%, preferably 0.5-14 wt%; And / or, based on the total weight of the lubricating oil composition, the content of the base oil is 77.5-99.9 wt%, preferably 82.8-99.4 wt%; Preferably, based on the total weight of the lubricating oil composition, the viscosity index improver contains 0.1 wt%-8 wt%, the extreme pressure anti-wear agent contains 0.01 wt%-3 wt%, the antioxidant contains 0.01 wt%-1.6 wt%, the friction improver contains 0.01 wt%-1.5 wt%, the metal deactivator contains 0.01 wt%-1.5 wt%, the dispersant contains 0.01 wt%-5 wt%, the detergent contains 0.01 wt%-1.5 wt%, and the antifoaming agent contains 0.0001 wt%-0.01 wt%, with the balance being the base oil.

3. The lubricating oil composition according to claim 2, wherein, Based on the total weight of the lubricating oil composition, the viscosity index improver contains 0.5wt%-6wt%, the extreme pressure anti-wear agent contains 0.05wt%-2.5wt%, the antioxidant contains 0.02wt%-1.2wt%, the friction improver contains 0.02wt%-1.2wt%, the metal deactivator contains 0.02wt%-1.2wt%, the dispersant contains 0.02wt%-4wt%, the detergent contains 0.02wt%-1wt%, the antifoaming agent contains 0.0003wt%-0.008wt%, and the balance is base oil.

4. The lubricating oil composition according to any one of claims 1-3, wherein, The base oil is selected from at least one of mineral hydrogenated base oil, polyalpha-olefin synthetic base oil, polyol ester synthetic base oil, polyalkylene glycol and diester synthetic base oil; And / or, the kinematic viscosity of the base oil at 100°C is 2-7 mm. 2 / s.

5. The lubricating oil composition according to any one of claims 1-4, wherein, The viscosity index improver is selected from at least one of polyalphaolefin, polymethyl methacrylate, styrene-butadiene copolymer, styrene polyester and poly(n-butyl vinyl ether); And / or, the viscosity index improver has a weight-average molecular weight of 300-2000 g / mol, preferably 500-1500 g / mol.

6. The lubricating oil composition according to any one of claims 1-5, wherein, The antioxidant is selected from phenolic antioxidants and / or amine antioxidants; Preferably, the antioxidant is selected from phenolic antioxidants and amine antioxidants; More preferably, the weight ratio of the phenolic antioxidant to the amine antioxidant is 1:(0.1-5), and more preferably 1:(0.5-3).

7. The lubricating oil composition according to claim 6, wherein, The phenolic antioxidant is 2,6-di-tert-butyl-p-cresol; And / or, the amine antioxidant is selected from octyldiphenylamine and / or N-phenyl-α-naphthylamine.

8. The lubricating oil composition according to any one of claims 1-7, wherein, The metal deactivator is selected from methyltriazole and / or thiadiazole derivatives; Preferably, the dispersant is selected from succinimide polymers and / or succinate polymers; Preferably, the detergent is selected from petroleum sulfonates and / or synthetic sulfonates; Preferably, the antifoaming agent is selected from methyl silicone oil and / or acrylate copolymer.

9. A method for preparing a lubricating oil composition, characterized in that, The method includes: After the base oil is mixed with the antifoaming agent and detergent, a viscosity index improver, extreme pressure anti-wear agent, antioxidant, friction modifier, metal deactivator and dispersant are added for a second mixing to obtain a lubricating oil composition. Wherein, the lubricating oil composition is the lubricating oil composition according to any one of claims 1-8.

10. The preparation method according to claim 9, wherein, The conditions for the first mixing include: a temperature of 30-100℃, preferably 40-80℃; and a time of 0.1-1h, preferably 0.3-0.7h. And / or, the conditions for the second mixing include: a temperature of 0-75°C, preferably 20-50°C; and a time of 2-6 hours, preferably 3-5 hours.

Images