Dispersant for diesel engine oil compound, diesel engine oil compound, and diesel engine oil

Abstract

The present invention relates to the technical field of chemical industry, and particularly to a dispersant for a diesel engine oil compound, a diesel engine oil compound, and diesel engine oil. The structural formula of the dispersant is shown in Formula I. A substance shown in Formula II and a substance shown in Formula III are reacted at a temperature of 100-140° C. for 3-5 hours to obtain a substance shown in Formula IV, and the substance shown in Formula IV and a substance shown in Formula V are reacted at 170-190° C. under nitrogen protection for 3-4 hours to obtain the dispersant. The diesel engine oil compound comprises 40-70 parts by weight of the dispersant for the diesel engine oil compound, 5-30 parts by weight of a detergent, 5-20 parts by weight of an antioxidant, 5-20 parts by weight of an antioxidant and an antiwear agent, and 0-26 parts by weight of a base oil. The diesel engine oil compound has excellent soot and sludge dispersibility, can prevent oil viscosity growth caused by soot agglomeration, and inhibit the formation of sludge, varnish, and carbon deposits.

Description

Technical Field

[0001] The present invention relates to the technical field of chemical industry, and in particular to a dispersant for a diesel engine oil compound, a diesel engine oil compound and diesel engine oil. Background Art

[0002] Diesel engine oil is the oil used in diesel engines. An engine consists of numerous critical moving parts, such as pistons, crankshafts, valves, and camshafts. Diesel engine oil protects these parts by keeping them lubricated, ensuring proper operation and minimizing energy loss. It reduces friction and damage when moving parts against each other. Diesel engine oil is composed of base oil, lubricant additives, pour point depressants, and viscosity modifiers. The most important of these is the lubricant additive, which provides dispersancy, detergency, anti-wear properties, and antioxidant properties. These properties are provided by various additives within the lubricant, such as dispersants for dispersancy, detergents for detergency, and ZDDP for antioxidant and corrosion resistance. Existing diesel engine oil additives contain large amounts of antioxidants containing nitrogen and sulfur, which generate sulfur dioxide and nitric oxide, which pollute the environment. Using a dispersant with antioxidant properties in the additive can reduce antioxidant usage, thereby achieving energy conservation and emission reductions. This can also reduce the amount of additives added, lowering costs and better meeting market demand.

[0003] Diesel fuel contains a relatively high sulfur content, a harmful substance that forms sulfuric acid or sulfurous acid during combustion. These harmful substances, along with high-temperature, high-pressure exhaust gases, enter the oil pan, accelerating the oxidation and deterioration of the engine oil. Therefore, diesel engine oil formulations require the addition of more antioxidants and additives that make the oil more alkaline. Currently, diesel engine oil additives on the market contain more antioxidants and dispersants to meet higher-level requirements (CK-4), resulting in higher additive dosages. To meet environmental protection, energy conservation, and emission reduction standards, as well as to reduce additive dosages, it is necessary to develop additives that utilize new, multifunctional ashless dispersants, thereby reducing the use of antioxidants and ZDDP in the oil, lowering zinc content, and reducing sulfated ash. Summary of the Invention

[0004] In response to the deficiencies of the above-mentioned prior art, the present invention aims to provide a dispersant for a diesel engine oil compound, a diesel engine oil compound, and a diesel engine oil. By using a dispersant with excellent soot dispersibility and antioxidant properties, the dosage of antioxidant and ZDDP is reduced, thereby reducing the sulfur, phosphorus, and zinc content, reducing sulfated ash content, reducing harmful gas emissions, and reducing the dosage of the compound.

[0005] In order to solve the above problems, the present invention adopts the following technical solutions:

[0006] A dispersant for a diesel engine oil compound, wherein the structural formula of the dispersant is shown in Formula I;

[0007]

[0008] Wherein, n is an integer greater than or equal to 1, and x is an integer greater than or equal to 1.

[0009] Further, the dispersant is synthesized by the following steps:

[0010] The substance represented by formula II and the substance represented by formula III are reacted at a temperature of 100-140° C. for 3-5 hours to obtain the substance represented by formula IV;

[0011] The substance represented by formula IV and the substance represented by formula V are reacted at 170-190° C. under nitrogen protection for 3-4 hours to prepare the dispersant;

[0012] The structural formulas of Formula II, Formula III, Formula IV and Formula V are as follows:

[0013]

[0014]

[0015] Wherein, n is an integer greater than or equal to 1, and x is an integer greater than or equal to 1.

[0016] Furthermore, n is 5-27, and x is 1-15.

[0017] Furthermore, the dispersant has an alkalinity of 24-40 mgKOH / g and a nitrogen content of 1.3-2.5%.

[0018] Furthermore, the molar ratio of the substance represented by formula II to the substance represented by formula III is greater than or equal to 2; the molar ratio of the substance represented by formula IV to the substance represented by formula V is less than 0.5, preferably 1:2.

[0019] A diesel engine oil compound comprising, by weight:

[0020] 40-70 parts by weight of the dispersant for diesel engine oil composite;

[0021] 5-30 parts by weight of a detergent;

[0022] 5-20 parts by weight of an antioxidant;

[0023] 5-20 parts by weight of an antioxidant and antiwear agent;

[0024] 0-26 parts by weight of base oil.

[0025] A method for preparing a diesel engine oil composite comprises: sequentially adding 40-70 parts by weight of a dispersant for a diesel engine oil composite, 5-20 parts by weight of an antioxidant, and 5-20 parts by weight of an antioxidant into a blending kettle, heating the mixture to 55-65° C., and stirring for 1 hour; then adding 5-20 parts by weight of an antioxidant and an anti-wear agent and 0-45 parts by weight of a base oil at 60-65° C., continuing stirring for 2 hours, and filtering to obtain the diesel engine oil composite.

[0026] Furthermore, the detergent is 200-350 mgKOH / g of sulfurized alkylphenate calcium and or 200-450 mgKOH / g of alkylbenzenesulfonate calcium; the antiwear agent is dialkyldithiophosphate zinc with a P content of 7.5% to 8.8%; and the antioxidant is one or more of nonyldiphenylamine, a sulfide-type antioxidant, and a phenolic ester-type antioxidant with a N content of 4.30% to 5.00%.

[0027] A diesel engine oil comprises the diesel engine oil composite agent.

[0028] Furthermore, the weight classification includes:

[0029] 10-15 parts by weight of the diesel engine oil compound;

[0030] 50-55 parts by weight of Group II 150N base oil;

[0031] 25-35 parts by weight of Group II 500N base oil;

[0032] 5-6 parts by weight of T614 tackifier;

[0033] 0.1-0.5 parts by weight of pour point depressant.

[0034] The beneficial effects of the present invention are:

[0035] 1. The diesel engine oil compound of the present invention has excellent soot and sludge dispersibility, prevents the increase in oil viscosity caused by soot agglomeration, and inhibits the formation of sludge, varnish and carbon deposits;

[0036] 2. The diesel engine oil compound of the present invention has excellent antioxidant properties, effectively inhibits oil aging, and extends the oil change cycle of equipment;

[0037] 3. The diesel engine oil compound of the present invention has excellent anti-wear properties, which can effectively reduce equipment wear and extend the service life of gas engines;

[0038] 4. The diesel engine oil compound of the present invention has excellent alkali retention performance and can also be applied to extremely harsh working conditions, ensuring the normal operation of the engine;

[0039] 5. The diesel engine oil compound of the present invention does not use additives containing barium, chlorine, etc. that are serious environmental pollutants, and is an environmentally friendly additive. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 Schematic diagram of the synthesis process of the dispersant of the present invention. DETAILED DESCRIPTION

[0041] The present invention will be further described in detail below with reference to specific embodiments.

[0042] It should be noted that these embodiments are only used to illustrate the present invention, rather than to limit the present invention. Simple improvements to the method based on the concept of the present invention fall within the scope of protection claimed by the present invention.

[0043] A diesel engine oil compound comprises the following components in percentage by weight: 40-70% dispersant, 5%-30% detergent, 5%-20% antioxidant, 5%-20% antioxidant and anti-wear agent, and the balance being base oil.

[0044] The dispersant is selected from an antioxidant ashless dispersant (Formula I) having a base value of 24-40 mgKOH / g and a nitrogen content of 1.3-2.5%. The molecular configurations of the intermediate products and the final product of the entire reaction process are shown in the following examples.

[0045]

[0046] The substance represented by formula II and the substance represented by formula III are reacted at a temperature of 100-140° C. for 4 hours to obtain the substance represented by formula IV;

[0047] The substance represented by formula IV and the substance represented by formula V are reacted at 170-190° C. under nitrogen protection for 3-4 hours to prepare the dispersant;

[0048] The structural formulas of Formula II, Formula III, Formula IV and Formula V are as follows:

[0049]

[0050] wherein n is an integer greater than or equal to 1, and x is an integer greater than or equal to 1. Preferably, n is 5-27, and x is 1-15.

[0051] The dispersant obtained by the present invention has at least one intermediate containing diphenylamine in one molecule, which makes the dispersant have excellent dispersing performance and excellent antioxidant performance.

[0052] The detergent is selected from calcium alkyl phenate sulfide with a base value of 200-350 mgKOH / g and calcium alkylbenzene sulfonate with a base value of 200-450 mgKOH / g;

[0053] The anti-wear agent is selected from zinc dialkyl dithiophosphate, with a P content of 7.5% to 8.8%;

[0054] The antioxidant is selected from one or more of nonyldiphenylamine, sulfide-type antioxidants, and phenolic ester-type antioxidants, and the N content is 4.30% to 5.00%.

[0055] Example 1:

[0056] In a 500ml four-necked glass bottle, add 184.3g (1.0mol) of 10-undecenoic acid and 84.6g (0.5mol) of diphenylamine. Stir and heat to 100-140°C. Add 25g of aluminum trichloride to the reaction system and continue the reaction for 4 hours. After the reaction, wash with 200g of deionized water and remove the catalyst by separating the liquids to obtain a reaction product. Liquid chromatography confirms that the diphenylamine has reacted completely and that the product is primarily disubstituted. The acid value of the reaction product is 205mgKOH / g.

[0057] Example 2:

[0058] To a 5000ml stainless steel autoclave, 2300g (1.0mol) of highly reactive polyisobutylene (number-average molecular weight 2300, α-olefin content ≥85wt%) was added, nitrogen atmosphere maintained, and the temperature was raised to 200°C. 176.5g (1.8mol) of molten maleic anhydride was slowly added dropwise over 30 minutes via a dripping apparatus. After the addition, the temperature in the autoclave was slowly raised to 230°C and the reaction continued at this temperature for 4 hours. After the reaction, nitrogen was purged into the autoclave to remove any unreacted maleic anhydride. The saponification value of the reaction product was determined to be 60mgKOH / g.

[0059] Example 3:

[0060] To a 250 ml four-necked flask, 100 g of the product from Example 2 and 70.53 g of 150N hydrogenated base oil were added. The temperature was raised to 70°C with stirring, and 6.75 g of tetraethylenepentamine was added. Nitrogen was introduced, and the temperature was raised to 150°C and kept constant for 3 hours to obtain a reaction product. Testing revealed a kinematic viscosity of 295.6 mm² / s at 100°C, a base number of 36.5 mgKOH / g, and a nitrogen content of 1.36%.

[0061] Example 4:

[0062] To a 250 ml four-necked flask, 100 g of the product from Example 3 and 1.79 g of the product from Example 1 were added, nitrogen was introduced, and the temperature was raised to 170°C with stirring. The reaction was then kept at this temperature for 4 hours to obtain a reaction product. Testing revealed a kinematic viscosity of 374.9 mm² / s at 100°C, a base number of 33.7 mgKOH / g, and a nitrogen content of 1.42%.

[0063] Example 5:

[0064] To a 250 ml four-necked flask, 100 g of the product from Example 3 and 4.65 g of the product from Example 1 were added, nitrogen was introduced, and the temperature was raised to 190°C with stirring. The reaction was then kept at this temperature for 3 hours to obtain a reaction product. Testing revealed a kinematic viscosity of 512.6 mm² / s at 100°C, a base number of 27.6 mgKOH / g, and a nitrogen content of 1.49%.

[0065] Example 6:

[0066] To a 250 ml four-necked flask were added 100 g of the product from Example 2 and 70.32 g of 150N hydrogenated base oil. The mixture was stirred and heated to 70°C. 6.44 g of heavy polyethylene polyamine (average molecular weight 265, nitrogen content 34%) was added. Nitrogen was introduced, and the temperature was raised to 150°C for a constant reaction of 3 h to obtain a reaction product. Testing revealed a kinematic viscosity of 348.3 mm² / s at 100°C, a base number of 28.4 mgKOH / g, and a nitrogen content of 1.23%.

[0067] Example 7:

[0068] To a 250 ml four-necked flask, 100 g of the product from Example 6 and 3.66 g of the product from Example 1 were added, nitrogen was introduced, and the temperature was raised to 190°C with stirring. The reaction was then kept at this temperature for 3 hours to obtain a reaction product. Testing revealed a kinematic viscosity of 578.4 mm² / s at 100°C, a base number of 24.0 mgKOH / g, and a nitrogen content of 1.32%.

[0069] The final products obtained in Examples 3 to 7 were used to prepare finished lubricating oils in the same proportions (the dispersant accounted for 5.5% of the oil, and the types and dosages of the other agents remained unchanged). Dispersibility was evaluated according to the low-temperature dispersibility evaluation method for ashless dispersants in Appendix A of SH / T0623. Dispersibility is expressed as a dispersion index, with a larger dispersion index indicating better dispersibility. Antioxidant performance was also evaluated, with a longer antioxidant time indicating better antioxidant performance. The results are shown in Table 1:

[0070] Table 1 Test results of antioxidant finished oils in Examples 3 to 7

[0071] Test items Dispersion Index Antioxidant performance (PDSC), min Example 3 60 20 Example 4 62 24 Example 5 66 31 Example 6 58 21 Example 7 65 30

[0072] According to the above performance evaluation data, the antioxidant ashless dispersants prepared in the examples of this patent (Example 4, Example 5, Example 7) have better dispersibility than the traditional ashless dispersants (Example 3, Example 6), and their antioxidant properties are significantly better than those of the traditional ashless dispersants.

[0073] Quality Verification of Diesel Engine Oil Compounds

[0074] Example 8

[0075] Antioxidant ashless dispersant 70%, sulfurized alkyl phenate calcium 5%, alkylbenzene sulfonate calcium 5%, nonyl diphenylamine 3%, phenol ester antioxidant 2%, thioether antioxidant 2%, dialkyl dithiophosphate zinc 6%, neutral base oil 7%.

[0076] The preparation method comprises the following steps: adding an antioxidant ashless dispersant, alkyl phenol calcium sulfide, alkylbenzene sulfonate calcium, nonyldiphenylamine, sulfide-type antioxidant, and phenolic ester-type antioxidant into a blending kettle in sequence, heating the mixture to 55-65° C. while stirring, and stirring at 600 rpm for 1 hour; then adding zinc dialkyl dithiophosphate and base oil at 60-65° C., continuing stirring for 2 hours, and filtering to obtain a diesel engine oil composite product.

[0077] Example 9

[0078] Antioxidant ashless dispersant 60%, sulfurized alkyl phenate calcium 5%, alkylbenzene sulfonate calcium 5%, nonyl diphenylamine 4%, phenol ester antioxidant 3%, thioether antioxidant 2%, dialkyl dithiophosphate zinc 7%, neutral base oil 14%.

[0079] The preparation method comprises the following steps: adding an antioxidant ashless dispersant, alkyl phenol calcium sulfide, alkylbenzene sulfonate calcium, nonyldiphenylamine, sulfide-type antioxidant, and phenolic ester-type antioxidant into a blending kettle in sequence, heating the mixture to 55-65° C. while stirring, and stirring at 600 rpm for 1 hour; then adding zinc dialkyl dithiophosphate and base oil at 60-65° C., continuing stirring for 2 hours, and filtering to obtain a diesel engine oil composite product.

[0080] Example 10

[0081] Antioxidant ashless dispersant 50%, sulfurized alkyl phenate calcium 5%, alkylbenzene sulfonate calcium 5%, nonyl diphenylamine 6%, phenol ester antioxidant 4%, thioether antioxidant 2%, dialkyl dithiophosphate zinc 8%, neutral base oil 20%.

[0082] The preparation method comprises the following steps: adding an antioxidant ashless dispersant, alkyl phenol calcium sulfide, alkylbenzene sulfonate calcium, nonyldiphenylamine, sulfide-type antioxidant, and phenolic ester-type antioxidant into a blending kettle in sequence, heating the mixture to 55-65° C. while stirring, and stirring at 600 rpm for 1 hour; then adding zinc dialkyl dithiophosphate and base oil at 60-65° C., continuing stirring for 2 hours, and filtering to obtain a diesel engine oil composite product.

[0083] Example 11

[0084] Antioxidant ashless dispersant 40%, sulfurized alkyl phenate calcium 5%, alkylbenzene sulfonate calcium 5%, nonyl diphenylamine 8%, phenol ester antioxidant 5%, thioether antioxidant 2%, dialkyl dithiophosphate zinc 9%, neutral base oil 26%.

[0085] The preparation method comprises the following steps: adding an antioxidant ashless dispersant, alkyl phenol calcium sulfide, alkylbenzene sulfonate calcium, nonyldiphenylamine, sulfide-type antioxidant, and phenolic ester-type antioxidant into a blending kettle in sequence, heating the mixture to 55-65° C. while stirring, and stirring at 600 rpm for 1 hour; then adding zinc dialkyl dithiophosphate and base oil at 60-65° C., continuing stirring for 2 hours, and filtering to obtain a diesel engine oil composite product.

[0086] Example 12

[0087] Antioxidant ashless dispersant 35%, sulfurized alkyl phenate calcium 5%, alkylbenzene sulfonate calcium 5%, nonyl diphenylamine 10%, phenol ester antioxidant 8%, thioether antioxidant 2%, dialkyl dithiophosphate zinc 10%, neutral base oil 25%.

[0088] The preparation method comprises the following steps: adding an antioxidant ashless dispersant, alkyl phenol calcium sulfide, alkylbenzene sulfonate calcium, nonyldiphenylamine, sulfide-type antioxidant, and phenolic ester-type antioxidant into a blending kettle in sequence, heating the mixture to 55-65° C. while stirring, and stirring at 600 rpm for 1 hour; then adding zinc dialkyl dithiophosphate and base oil at 60-65° C., continuing stirring for 2 hours, and filtering to obtain a diesel engine oil composite product.

[0089] Comparative Example 1: conventional ashless dispersant, polyisobutylene succinimide 70%, sulfurized alkyl phenate calcium 5%, alkylbenzene sulfonate calcium 5%, nonyl diphenylamine 4%, phenol ester antioxidant 3%, thioether antioxidant 2%, dialkyl dithiophosphate zinc 7%, neutral base oil 4%.

[0090] The preparation method comprises the following steps: adding polyisobutylene succinimide, alkyl phenol calcium sulfide, alkylbenzene sulfonate calcium, nonyldiphenylamine, sulfide-type antioxidant, and phenolic ester-type antioxidant into a blending kettle in sequence, heating the mixture to 55-65° C. while stirring, and stirring at 600 rpm for 1 hour; then adding zinc dialkyl dithiophosphate and base oil at 60-65° C., continuing stirring for 2 hours, and filtering to obtain a diesel engine oil composite product.

[0091] Comparative Example 2: conventional ashless dispersant, polyisobutylene succinimide 60%, sulfurized alkyl phenate calcium 5%, alkylbenzene sulfonate calcium 5%, nonyl diphenylamine 8%, phenol ester antioxidant 5%, thioether antioxidant 2%, dialkyl dithiophosphate zinc 9%, neutral base oil 6%.

[0092] The preparation method comprises the following steps: adding polyisobutylene succinimide, alkyl phenol calcium sulfide, alkylbenzene sulfonate calcium, nonyldiphenylamine, sulfide-type antioxidant, and phenolic ester-type antioxidant into a blending kettle in sequence, heating the mixture to 55-65° C. while stirring, and stirring at 600 rpm for 1 hour; then adding zinc dialkyl dithiophosphate and base oil at 60-65° C., continuing stirring for 2 hours, and filtering to obtain a diesel engine oil composite product.

[0093] The above examples were used to prepare CK-4-15W-40 diesel engine oil. The test temperature was 210°C according to the SH / T 0719 method for determining the oxidation induction period of lubricating oils (pressure differential scanning calorimetry, PDSC). The dispersibility was evaluated according to the SH / T 0623 method for evaluating the low-temperature dispersibility of ashless dispersants. The anti-wear properties of the samples were evaluated according to the SH / T 0189 method for determining the anti-wear properties of lubricating oils (four-ball tester method) (experimental conditions: 392N, 75°C, 1200 r / min, 60 min). The oil blending formula was: 12% compounding agent, 52.2% Class II 150N base oil, 30% Class II 500N base oil, 5.5% T614 tackifier, and 0.3% Viscoplex 1-248 pour point depressant.

[0094] Comparison of antioxidant properties

[0095] According to SH / T 0719 lubricating oil oxidation induction period determination method (pressure differential scanning calorimetry PDSC), the test temperature is 210 ° C, and the oxidation induction period of the test sample is tested. The larger the result, the better the antioxidant ability of the sample. The experimental results are shown in Table 2:

[0096] Table 2 Antioxidant performance test results of different samples

[0097]

[0098] The aforementioned performance evaluation data demonstrates that lubricating oils inevitably come into contact with metals during use, subjecting them to light, heat, and oxygen, which can lead to oxidation. To improve the oxidative stability of lubricating oils, reduce and delay their oxidative degradation, and extend the oil change period, the present invention utilizes a combination of octyldiphenylamine, a phenolic ester antioxidant, and a thioether antioxidant to achieve a synergistic effect. The oxidation induction period data in Table 2 demonstrates that using less antioxidant and ZDDP in Examples 8-10 still provides improved oxidation performance, thereby reducing the amount of antioxidant and ZDDP used, reducing emissions and the amount of compounding agent added.

[0099] Dispersion performance comparison

[0100] The dispersion performance was evaluated according to the SH / T0623 low-temperature dispersibility evaluation method for ashless dispersants. The dispersibility was expressed as a dispersion index. The larger the dispersion index, the better the dispersion effect.

[0101] Table 3 Dispersion performance test results of different samples

[0102]

[0103]

[0104] According to the data in the above table, the composite agent can provide excellent soot dispersing performance, prevent the viscosity increase of oil products caused by soot agglomeration, and at the same time better disperse the precursors of sludge, varnish and carbon deposits in the oil products, thereby inhibiting the formation of sludge, varnish and carbon deposits, and inhibiting the formation of various oxidation products, and achieving soot and sludge dispersing function.

[0105] Wear resistance comparison

[0106] The anti-wear properties of the samples were evaluated according to the SH / T 0189 lubricating oil anti-wear performance test method (four-ball test method) (experimental conditions: 392N, 75°C, 1200r / min, 60min). The experimental results are the wear spot diameter. The smaller the wear spot, the better the anti-wear performance of the sample. The specific results are shown in Table 4:

[0107] Table 4 Anti-wear performance test results of different samples

[0108] Sample name Wear spot diameter, mm Average friction coefficient Example 8 0.4220 0.105 Example 9 0.4222 0.107 Example 10 0.4238 0.105 Example 11 0.4230 0.108 Example 12 0.4233 0.111 Comparative Example 1 0.4253 0.115 Comparative Example 2 0.4299 0.120

[0109] According to the evaluation data in the table above, ZDDP can inhibit the formation of engine varnish, sludge, and ring groove adhesions, slow wear of cylinders, ring grooves, cams, and valve stems, and prevent bearing corrosion. Within a certain range, the greater the amount added, the better the effect. As can be seen in Table 4, when using less ZDDP, as in Examples 8-10, good anti-wear performance is still maintained, thereby reducing the amount of ZDDP used, reducing emissions and the amount of compounding agent added.

[0110] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described with reference to the preferred embodiments of the present invention, it should be understood by those skilled in the art that various changes can be made in form and details without departing from the spirit and scope of the present invention as defined in the appended claims.

Claims

1. A dispersant for diesel engine oil compound, characterized in that: The structural formula of the dispersant is shown in Formula I; Formula I Wherein, n is an integer greater than or equal to 1, and x is an integer greater than or equal to 1; The dispersant is synthesized by the following steps: The substance represented by formula II and the substance represented by formula III are reacted at a temperature of 100-140° C. for 3-5 hours to obtain the substance represented by formula IV; The substance represented by formula IV and the substance represented by formula V are reacted at 170-190° C. under nitrogen protection for 3-4 hours to prepare the dispersant; The structural formulas of Formula II, Formula III, Formula IV and Formula V are as follows: Formula II Formula III Formula IV Formula V Wherein, n is an integer greater than or equal to 1, and x is an integer greater than or equal to 1; The dispersant has a base value of 24-40 mgKOH / g and a nitrogen content of 1.3-2.5%; The molar ratio of the substance represented by formula II to the substance represented by formula III is greater than or equal to 2; the molar ratio of the substance represented by formula IV to the substance represented by formula V is less than 0.

5.

2. The dispersant for diesel engine oil compound according to claim 1, characterized in that: n is 5-27, and x is 1-15.

3. A diesel engine oil compound, characterized in that: In parts by weight: 40-70 parts by weight of the dispersant for diesel engine oil compound according to claim 1; 5-30 parts by weight of a detergent; 5-20 parts by weight of an antioxidant; 5-20 parts by weight of an antioxidant and antiwear agent; 0-26 parts by weight of base oil.

4. The diesel engine oil compound according to claim 3, characterized in that The detergent is 200-350 mgKOH / g of sulfurized alkylphenate calcium and or 200-450 mgKOH / g of alkylbenzenesulfonate calcium; the antioxidant and anti-wear agent is dialkyldithiophosphate zinc with a phosphorus content of 7.5% to 8.8%; the antioxidant is one or more of nonyldiphenylamine, a sulfide-type antioxidant, and a phenolic ester-type antioxidant with a nitrogen content of 4.30% to 5.00%.

5. A diesel engine oil, characterized in that: The invention comprises the diesel engine oil compound according to claim 3.

6. The diesel engine oil according to claim 5, characterized in that In parts by weight: 10-15 parts by weight of the diesel engine oil compound according to claim 3; 50-55 parts by weight of Group II 150N base oil; 25-35 parts by weight of Group II 500N base oil; 5-6 parts by weight of T614 tackifier; 0.1-0.5 parts by weight of pour point depressant.

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