A diesel engine oil compound

Abstract

The present disclosure provides a diesel engine oil compound, relating to the technical field of diesel engine oil compounds. The above-mentioned diesel engine oil compound comprises the following components in parts by mass: 40-60 parts of a multifunctional ashless dispersant, 20-30 parts of a metal detergent, 4-16 parts of a high-temperature antioxidant, 9-19 parts of an antioxidant and anti-corrosion agent, and 0-1.0 parts of a friction modifier. Among them, the general formula of the multifunctional ashless dispersant is as follows: X is an integer from 1 to 8. The diesel engine oil formulated with the diesel engine oil compound of the present disclosure has excellent soot dispersibility, high-temperature detergency and anti-wear performance.

Description

Technical Field

[0001] The present disclosure relates to the technical field of diesel engine oil compound additives, and particularly to a diesel engine oil compound additive. Background Art

[0002] Throughout the world, the successive upgrades of internal combustion engine oils have been continuously driven by changes in emission regulations and engine structures. Diesel engines adopt in-cylinder direct injection, fuel late injection, high-top piston rings, and exhaust gas recirculation technology (EGR) to meet the requirements of high power and low emissions. The adoption of these technologies increases the soot content in the engine oil, easily causes an increase in the oil viscosity, blocks the oil filter, and at the same time causes wear of friction pairs such as cylinder liners, piston rings, and valve groups. The update of diesel engines drives the continuous development of diesel engine oils. The situation of high-grade oils coexisting with medium- and low-grade oils will be maintained for a long time, and the oils of API CI-4 specification still dominate.

[0003] The ASTM D4485 standard stipulates that diesel engine oils of CI-4 specification must pass eight engine bench tests. Among these tests, four bench tests require the oils to have good soot dispersion performance, three bench tests require the oils to have good anti-wear performance under high soot content conditions, two bench tests require the oils to have good detergency performance, and the antioxidant performance requirements for CI-4 specification oils are also greatly improved compared with those of CH-4 specification. Excellent soot dispersion performance can prevent engine wear and oil viscosity increase caused by soot agglomeration. Excellent detergency performance can ensure engine cleanliness, effectively prevent piston ring sticking, maintain normal fuel supply, and extend the service life of the engine. It is especially suitable for construction machinery engines with uneven fuel levels and low-speed large-torque output working conditions, such as military or civilian diesel engines like generator sets, bulldozers, excavators, mining equipment, and armored vehicles.

[0004] CN106281577A discloses a lubricating oil composition that uses an antioxidant with a novel structure and is combined with an antioxidant ashless dispersant and other ashless dispersants, making the lubricating oil composition have excellent antioxidant, soot dispersion, and high-temperature detergency performance.

[0005] CN113388431A discloses a diesel engine oil composition that uses a phenolic derivative to improve the antioxidant performance of the diesel engine oil, making the oil have good piston detergency performance and can effectively inhibit piston ring groove and ring bank coking, carbon deposition, and skirt lining discoloration problems.

[0006] CN106753701A discloses a diesel engine lubricating oil composition that uses a multi-functional additive, making the oil have excellent antioxidant, anti-wear, and high-temperature detergency.

[0007] CN111040840A discloses a diesel engine oil composition which uses a viscosity index improver with a dispersing function, making the oil have excellent high-temperature detergency, soot dispersibility, antioxidant property, anti-wear property, metal corrosion inhibition property and low-temperature property.

[0008] It can be found that in order to meet the demanding soot dispersibility of diesel engine oil, a relatively large amount of dispersant is required in the lubricating oil composition, which will increase the cost of diesel engine oil compound and diesel engine oil. Therefore, when the diesel engine oil prepared with the current market diesel engine oil compound is used in the vehicle diesel engine oil system, there are still problems such as high dosage, insufficient high-temperature detergency and soot dispersibility. Summary of the Invention

[0009] In order to solve the above problems existing in the prior art, the purpose of the present disclosure is to provide a diesel engine oil compound composed of excellent multifunctional ashless dispersants, metal detergents, high-temperature antioxidants, antioxidant and corrosion inhibitors, etc., and in the application process, the diesel engine oil compound can be added in a proportion of 8-11 w%, and when used in combination with a suitable type II base oil, viscosity index improver and pour point depressant, the prepared diesel engine oil has excellent soot dispersibility, piston detergency, antioxidant, anti-corrosion and anti-wear properties.

[0010] In order to achieve the above purpose, the present disclosure adopts the following technical solutions:

[0011] According to the first aspect of the present disclosure, there is provided a diesel engine oil compound, characterized by comprising the following components in parts by mass:

[0012] 40-60 parts of multifunctional ashless dispersant, 20-30 parts of metal detergent, 4-16 parts of high-temperature antioxidant, 9-19 parts of antioxidant and corrosion inhibitor, 0-1.0 part of friction improver, wherein the general formula of the multifunctional ashless dispersant is as follows:

[0013]

[0014] wherein X is an integer from 1 to 8.

[0015] Further, the metal detergent is at least one of calcium benzenesulfonate and calcium sulfonated alkylphenol.

[0016] Further, the high-temperature antioxidant is an amine antioxidant and / or a phenolic ester antioxidant.

[0017] Further, the antioxidant and corrosion inhibitor is zinc dialkyldithiophosphate.

[0018] Further, the friction improver is at least one of molybdenum dialkyldithiocarbamate, molybdenum dialkyldithiophosphate, and oxygen molybdenum dialkyldithiocarbamate sulfide.

[0019] Further, the preparation method of the multifunctional ashless dispersant includes:

[0020] Performing an amination reaction between an aminophenol compound and polyisobutylene succinic anhydride at 70 - 240 °C to generate an intermediate product;

[0021] The intermediate product reacts with sulfur under the action of a promoter to generate a multifunctional ashless dispersant.

[0022] Further, the aminophenol compound includes o-aminophenol, m-aminophenol, p-aminophenol, 2,3-diaminophenol, and 2,4-diaminophenol.

[0023] Further, the number average molecular weight of polyisobutylene in the polyisobutylene succinic anhydride is 1000 - 5000.

[0024] Further, the molar ratio of the aminophenol compound to the polyisobutylene succinic anhydride is (0.5 - 1.5):1.

[0025] Further, the molar ratio of the aminophenol compound to the sulfur is 1:(0.5 - 6.0).

[0026] The beneficial effects of the above technical solutions provided by the present disclosure at least include:

[0027] A diesel engine oil compound of the present disclosure uses a multifunctional ashless dispersant in combination with a suitable detergent, high-temperature antioxidant, and antioxidant and antiwear agent. At a relatively low dosage, the synergistic effect between each component is fully exerted, so that the diesel engine oil compounded with the diesel engine oil compound prepared has excellent soot dispersibility, high-temperature detergency, and antiwear performance. Detailed Embodiments

[0028] To better understand the present application, the following further illustrates the present disclosure through examples. It should be understood that these detailed descriptions are only descriptions of the exemplary embodiments of the present application, and do not limit the scope of the present application in any way. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0029] The following further describes the present disclosure in detail:

[0030] The present disclosure provides a diesel engine oil compound, which is characterized by including the following components in parts by mass:

[0031] 40 - 60 parts of multifunctional ashless dispersant, 20 - 30 parts of metal detergent, 4 - 16 parts of high - temperature antioxidant, 9 - 19 parts of antioxidant and anti - corrosion agent, 0 - 1.0 part of friction improver. Among them, the general formula of the multifunctional ashless dispersant is as follows:

[0032]

[0033] Among them, X is an integer from 1 to 8. The above - mentioned multifunctional ashless dispersant has a polyisobutylene succinimide structure, a phenolic hydroxyl structure and a "sulfur bridge" structure, making the multifunctional ashless dispersant have excellent dispersion performance, and also having good detergency and anti - wear performance. And the multifunctional ashless dispersant can not only provide excellent soot dispersion performance, prevent the increase in oil viscosity caused by soot agglomeration, and enable the polar components generated during the deterioration of the oil to be well dispersed in the oil without deposition; at the same time, it can better disperse the precursors of sludge, paint film and carbon deposit in the oil, thereby inhibiting the formation of sludge, paint film and carbon deposit, and inhibiting the formation of various oxidation products, and achieving good use effects.

[0034] Further, the metal detergent is at least one of calcium benzenesulfonate and calcium sulfonated alkylphenol, preferably a mixture of calcium alkylbenzenesulfonate and calcium sulfonated alkylphenol.

[0035] Furthermore, the mass ratio of calcium alkylbenzenesulfonate to calcium sulfonated alkylphenol is (1 - 3):1. Among them, calcium alkylbenzenesulfonate is preferably high - base calcium sulfonate with a base number of 200 - 450 mgKOH / g, and calcium sulfonated alkylphenol is preferably high - base calcium sulfonated alkylphenol with a base number of 200 - 350 mgKOH / g. The present disclosure can use metal detergents with different base numbers in combination. Low - base sulfonates have good detergency, high - base sulfonates have better acid - neutralizing ability and high - temperature detergency, and sulfonated alkylphenol salts have good high - temperature detergency performance, which is particularly effective in inhibiting carbon deposit in the piston top ring groove of supercharged diesel engine oil. At the same time, they also have good basicity retention and antioxidant performance.

[0036] Further, the high - temperature antioxidant is an amine - type antioxidant and / or a phenolic ester - type antioxidant, including but not limited to di - n - butyl and di - n - octyl phenylamine, nonyl diphenylamine and / or isooctyl β-(3,5 - di - tert - butyl - 4 - hydroxyphenyl) propionate.

[0037] Further, the antioxidant and anti-corrosion agent is zinc dialkyldithiophosphate, wherein the alkyl group in the zinc dialkyldithiophosphate is an alkyl group containing 2-12 carbon atoms, preferably an alkyl group containing 2-8 carbon atoms. The above-mentioned zinc dialkyldithiophosphate includes but is not limited to zinc butyloctyldithiophosphate, zinc dioctyldithiophosphate, mixed primary and secondary alcohol alkyl dithiophosphates, and / or zinc di-secondary alkyl dithiophosphates. As an example, primary and secondary alcohol alkyl dithiophosphates can be used in combination as the antioxidant and anti-corrosion agent to provide antioxidant, anti-wear, and anti-corrosion properties for the lubricating oil under different temperature conditions, while inhibiting the formation of engine paint film, sludge, and ring groove adhesions, preventing wear of cylinders, ring grooves, cams, and valve stems, and preventing bearing corrosion.

[0038] The diesel engine oil compound prepared by using the multifunctional ashless dispersant of the present disclosure uses a high-temperature antioxidant and zinc dialkyldithiophosphate in combination during the preparation process. They cooperate with each other through different antioxidant mechanisms to jointly inhibit the high-temperature oxidation of the lubricating oil, endow the diesel engine oil with excellent high-temperature antioxidant performance and the ability to inhibit the formation of oil deposits, slow down and delay the oxidative degradation of the lubricating oil, inhibit the formation of sludge, and extend the service life and oil change interval of the diesel engine oil.

[0039] Further, the friction modifier is at least one of molybdenum dialkyldithiocarbamate, molybdenum dialkyldithiophosphate, and oxygen molybdenum sulfide dialkyldithiocarbamate. In addition to having anti-wear and friction-reducing effects, the friction modifier also has a certain antioxidant synergistic effect when compounded with other antioxidants.

[0040] Further, the preparation method of the above-mentioned multifunctional ashless dispersant includes:

[0041] An amination reaction is carried out between an aminophenol compound and polyisobutenyl succinic anhydride to generate an intermediate product;

[0042] The intermediate product undergoes a sulfidation reaction with sulfur under the action of a promoter to generate a multifunctional ashless dispersant.

[0043] Further, the aminophenol compound includes but is not limited to o-aminophenol, m-aminophenol, p-aminophenol, 2,3-diaminophenol, 2,4-diaminophenol, etc. The molecular structure of the aminophenol compound is characterized by containing a hydroxyl group and a primary amino group directly connected to the benzene ring.

[0044] Further, the number average molecular weight of polyisobutene in the polyisobutenyl succinic anhydride is 1000-5000, preferably 1300-3000, more preferably 1300-2300.

[0045] Further, the molar ratio of the aminophenol compound to the polyisobutylene succinic anhydride is (0.5 - 1.5):1, preferably (0.8 - 1.2):1, more preferably (1 - 1.1):1.

[0046] Further, the reaction temperature of the amination reaction is 70 - 240°C, preferably 120 - 180°C; the reaction time is 0.5 h to 10 h, preferably 3 h to 5 h.

[0047] Further, the molar ratio of the aminophenol compound to the sulfur is 1:(0.5 - 6.0), preferably 1:(0.5 - 4.0).

[0048] Further, the reaction temperature of the sulfidation reaction is 140 - 200°C, preferably 150 - 180°C; the reaction time is 2 - 8 h, preferably 3.5 - 5.5 h.

[0049] As an example, the above aminophenol compound can be selected from the following molecular formula:

[0050] The molecular formula of the above polyisobutylene succinic anhydride is as follows:

[0051] The reaction process of the preparation method of the multifunctional ashless dispersant is as follows:

[0052]

[0053] The present disclosure also provides a preparation method of a diesel engine oil compound containing the above multifunctional ashless dispersant, including: adding the multifunctional ashless dispersant into a container, heating to 65 - 75°C while stirring, and sequentially adding calcium sulfonated alkylphenol in the metal detergent, high-temperature antioxidant, calcium alkylbenzene sulfonate in the metal detergent, antioxidant anti-corrosion agent and friction improver, maintaining at 55 - 65°C, stirring for 2 - 3 hours, and filtering to obtain the diesel engine oil compound.

[0054] Example 1: Add 300 grams of polyisobutylene succinic anhydride (the number average molecular weight of polyisobutylene is 2300, and the saponification value is 55) and 208.96 grams of 150N hydrogenated base oil into a 1000 mL four-necked glass bottle, stir and heat to 70 - 80°C, and then slowly add 16.05 grams of p-aminophenol. After the feeding is completed, slowly heat the material to 120 - 180°C, and purge with nitrogen for 4 h to blow out the water produced by the reaction completely to obtain the intermediate product M1.

[0055] Example 2: In a 500 mL four-necked glass bottle, 200 grams of intermediate product M1 obtained in Example 1, 3.95 grams of sulfur (only about 65% participates in the reaction), and an appropriate amount of accelerator were added. The mixture was stirred and slowly heated to 150 - 180 °C for reaction for 4 h. During the reaction, H2S produced by the reaction and the escaped sulfur were removed by means of vacuum pumping, etc. The tail gas was discharged after being absorbed by an alkaline solution to obtain the final product S1.

[0056] Example 3: In a 500 mL four-necked glass bottle, 200 grams of intermediate product M1 obtained in Example 1, 11.85 grams of sulfur (only about 65% participates in the reaction), and an appropriate amount of accelerator were added. The mixture was stirred and slowly heated to 150 - 180 °C for reaction for 4 h. During the reaction, H2S produced by the reaction and the escaped sulfur were completely absorbed by an alkaline solution by means of vacuum pumping, etc. to obtain the final product S2.

[0057] Example 4: In a 1000 mL four-necked glass bottle, 300 grams of polyisobutylene succinic anhydride PIBSA-1300 (the number-average molecular weight of polyisobutylene is 1300, and the saponification value is 90), 214.62 grams of 150N hydrotreated base oil were added. The mixture was stirred and heated to 70 - 80 °C, and then 26.25 grams of p-aminophenol was slowly added. After the addition was completed, the material was slowly heated to 120 - 180 °C, and nitrogen was introduced to purge the reaction for 4 h to blow out all the water produced by the reaction to obtain the intermediate product M2.

[0058] Example 5: In a 500 mL four-necked glass bottle, 200 grams of intermediate product M2 obtained in Example 4, 6.60 grams of sulfur (only about 65% participates in the reaction), and an appropriate amount of accelerator were added. The mixture was stirred and slowly heated to 150 - 180 °C for reaction for 4 h. During this period, H2S produced by the reaction and the escaped sulfur were completely absorbed by an alkaline solution by means of vacuum pumping, etc. to obtain the final product S3.

[0059] Example 6: In a 500 mL four-necked glass bottle, 200 grams of product M2 obtained in Example 4, 19.83 grams of sulfur (only about 65% participates in the reaction), and an appropriate amount of accelerator were added. The mixture was stirred and slowly heated to 150 - 180 °C for reaction for 4 h. During this period, H2S produced by the reaction and the escaped sulfur were completely absorbed by an alkaline solution by means of vacuum pumping, etc. to obtain the final product S4.

[0060] Examples 7 - 12 correspond to the products obtained in Examples 1 to 6. According to the same ratio and other identical components, the mixture was stirred at 55 - 65 °C for 1 - 2 hours and formulated into a diesel engine oil compound by filtration. Examples 7 - 12 and Comparative Examples 1 - 2 have the same formulation composition except for the dispersant. The components and addition amounts of Examples 7 - 12 and Comparative Examples 1 - 4 are shown in Table 1 below.

[0061] Table 1

[0062]

[0063] Among them, the dispersant in Comparative Example 1 uses a high molecular weight polyisobutylene succinimide ashless dispersant, which can be selected but not limited to T161 produced by Wuxi Southern Petroleum Additive Co., Ltd., T161A and T161B produced by the Additive Plant of Jinzhou Petrochemical Company, RF1161H produced by Xinxiang Ruifeng New Material Co., Ltd., etc. The above high molecular weight polyisobutylene succinimide ashless dispersants have similar effects, and mutual replacement in the experiment will not affect the experimental results and data.

[0064] The dispersant in Comparative Example 2 uses a polyisobutylene bis-succinimide dispersant, which can be selected but not limited to T152 produced by Wuxi Southern Petroleum Additive Co., Ltd., T154 produced by the Additive Plant of Jinzhou Petrochemical Company, RF1154A produced by Xinxiang Ruifeng New Material Co., Ltd., etc. The above polyisobutylene bis-succinimide dispersants have similar effects, and mutual replacement in the experiment will not affect the experimental results and data.

[0065] Add Examples 7-12 and Comparative Examples 1-4 to the appropriate base oil, viscosity modifier and pour point depressant according to the same dosage, heat and mix evenly. The mixing temperature is generally 40-70 °C, and the mixing time is generally 1-3 hours to prepare diesel engine oil, and evaluate the dispersion performance, detergency performance and anti-wear performance.

[0066] Dispersion performance test

[0067] Use the carbon black dispersion test to evaluate the dispersion performance of the oil product on soot. The specific method is as follows: Use carbon black as a soot mimic, disperse it into the full-formula oil, measure the viscosity of the oil containing carbon black with a countercurrent viscometer, and calculate the viscosity growth rate. The smaller the growth rate, the better the dispersion performance of the oil sample. The specific results are shown in Table 2 below.

[0068] Table 2

[0069]

[0070]

[0071] It can be known from the test results in Table 2 that compared with Comparative Example 1, when the number average molecular weight of polyisobutylene succinimide is 2300 in Examples 7 to 9, the diesel engine oil compound containing the multifunctional ashless dispersant prepared in the present disclosure has better dispersion performance; compared with Comparative Example 2 in Examples 10 to 12, when the number average molecular weight of polyisobutylene succinimide is 1300, the diesel engine oil compound containing the multifunctional ashless dispersant prepared in the present disclosure has better dispersion performance.

[0072] Anti-wear Performance Test

[0073] The anti-wear property of the sample was evaluated according to SH / T 0189 - Determination of Anti-wear Property of Lubricating Oil (Four-ball Machine Method). The experimental conditions were: 392 N, 75 °C, 1200 r / min, 60 min. The experimental result was the wear scar diameter. According to GB / T 3142 - Determination of the Load-carrying Capacity of Lubricants (Four-ball Machine Method), the maximum non-seizure load of the oil sample was determined, and the result was PB (kg). The specific results are shown in Table 3 below.

[0074] Table 3

[0075]

[0076]

[0077] From the test results in Table 3, it can be known that Examples 8, 9, 11, and 12 have smaller wear scar diameters, indicating that the diesel engine oil compound containing the multifunctional ashless dispersant prepared according to the present disclosure can improve the anti-wear property of the oil product.

[0078] Detergency Performance Test

[0079] The detergency was evaluated according to the diesel engine oil detergency determination method (heat pipe oxidation method) in Appendix B of SH / T 0645. The detergency performance was expressed by a score. The higher the score, the better the detergency performance. The specific results are shown in Table 4 below.

[0080] Table 4

[0081] Sample Name Merit Score Sediment Weight, mg Sediment Length, cm Example 7 8.0 0.5 10 Example 8 7.5 0.6 11 Example 9 7.5 0.6 11 Example 10 8.0 0.5 10 Example 11 8.0 0.5 10 Example 12 7.5 0.6 11 Comparative Example 1 6.0 0.7 12 Comparative Example 2 7.0 0.6 11 Comparative Example 3 7.0 0.7 12 Comparative Example 4 7.0 0.7 12

[0082] From the test results in Table 4, it can be known that Examples 7 to 12 all have better detergency performance compared with Comparative Examples 1 to 4, indicating that the diesel engine oil compound containing the multifunctional ashless dispersant prepared according to the present disclosure can improve the detergency performance of the oil product; Example 9 has the same formulation composition as Comparative Examples 3 and 4 except for the detergent, indicating that the mixture of overbased calcium sulfonate and overbased calcium sulfurized alkylphenate has better detergency performance compared with single calcium sulfonate or calcium sulfurized alkylphenate.

[0083] According to the above performance evaluation data, compared with the compound of the comparative example, the diesel engine oil compound containing the multifunctional novel ashless dispersant prepared according to the present disclosure has better dispersion performance than the comparative example, and at the same time has excellent detergency and anti-wear property, and can significantly reduce the dosage of detergents and anti-wear agents in the oil product.

[0084] The diesel engine oil formulated with the diesel engine oil compound of the present disclosure has excellent dispersion performance, can inhibit the viscosity increase caused by a high soot content, and abrasive wear caused by soot agglomeration; can provide better antioxidant performance for the diesel engine oil, inhibit the formation of sludge, and extend the oil change cycle; has good anti-wear performance, can provide better anti-wear protection for the engine; also has good detergency performance, can keep the piston clean, and provide better detergency performance for the engine. At the same time, it does not use additives such as chlorine that cause serious environmental pollution, and belongs to an environmentally friendly additive.

[0085] In the application process, traditional polyisobutylene succinimide type ashless dispersants rely on polar groups such as imide in their molecular groups to adsorb and disperse soot. By introducing phenolic hydroxyl groups through a special structure, the multifunctional ashless dispersant of the present disclosure can have certain detergency performance and keep the piston ring and sludge shell clean; at the same time, the introduction of the sulfur bridge "-S-" group can further improve the anti-wear performance of the product, so as to achieve the multifunctional application of "one agent for multiple uses".

[0086] What is described in the above specification is only the specific implementation manners of the present disclosure. Various examples do not constitute a limitation to the substantive content of the present disclosure. Those of ordinary skill in the art to which the present disclosure pertains can make modifications or variations to the previously described specific implementation manners after reading the specification, without departing from the essence and scope of the present disclosure.

Claims

1. A diesel engine oil compound, characterized in that, It comprises components in the following parts by mass: 40 - 60 parts of multifunctional ashless dispersant, 20 - 30 parts of metal detergent, 4 - 16 parts of high-temperature antioxidant, 9 - 19 parts of antioxidant and anti-corrosion agent, 0 - 1.0 part of friction improver. Among them, the general formula of the multifunctional ashless dispersant is as follows: X is an integer from 1 to 8; The preparation method of the multifunctional ashless dispersant comprises: An amination reaction occurs between an aminophenol compound and polyisobutylene succinic anhydride at 70 - 240 °C to generate an intermediate product; The intermediate product reacts with sulfur under the action of a promoter to generate a multifunctional ashless dispersant; The molar ratio of the aminophenol compound to the polyisobutylene succinic anhydride is (1 - 1.1):1; The molar ratio of the aminophenol compound to the sulfur is 1:(0.5 - 6.0); The metal detergent is a mixture of calcium alkylbenzene sulfonate and calcium sulfonated alkylphenol, and the mass ratio of calcium alkylbenzene sulfonate to calcium sulfonated alkylphenol is (1 - 3):

1. Among them, the calcium alkylbenzene sulfonate is a high-base sulfonate with a base number of 200 - 450 mgKOH / g, and the calcium sulfonated alkylphenol is a high-base calcium sulfonated alkylphenol with a base number of 200 - 350 mgKOH / g.

2. The diesel engine oil compound according to claim 1, characterized in that, The high-temperature antioxidant is an amine-type antioxidant and / or a phenolic ester-type antioxidant.

3. The diesel engine oil composite agent according to claim 1, characterized in that, The antioxidant and anti-corrosion agent is zinc dialkyldithiophosphate.

4. The diesel engine oil compound according to claim 1, characterized in that, The friction improver is at least one of molybdenum dialkyldithiocarbamate, molybdenum dialkyldithiophosphate, and oxygen molybdenum sulfide dialkyldithiocarbamate.

5. The diesel engine oil compound according to claim 1, characterized in that, The aminophenol compound includes o-aminophenol, m-aminophenol, p-aminophenol, 2,3-diaminophenol, and 2,4-diaminophenol.

6. The diesel engine oil compound according to claim 1, wherein The number-average molecular weight of polyisobutylene in the polyisobutylene succinic anhydride is 1000 - 5000.

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