Zinc-free railroad locomotive diesel engine lubricating oil composition and method of making

Abstract

The present application discloses a zinc-free type railway locomotive diesel engine lubricating oil composition, which comprises the following components in percentage by mass: high-temperature detergent 5.0-8.0%, ashless dispersant 3.0-6.0%, multifunctional additive 2.0-4.0%, ashless antioxidant anticorrosive 0.5-1.5%, composite antioxidant 0.5-1.5%, pour point depressant 0.2-0.5%, antifoaming agent 0.0015-0.0050%, and the balance is catalytic hydrogenation base oil, and the sum of the mass percentages of the above components is 100%. The present application also discloses a preparation method of the lubricating oil composition, specifically: mixing the above components and stirring at 55-65 DEG C until uniform, and then the lubricating oil composition is obtained. Through the multifunctional additive, ashless antioxidant anticorrosive and the like, the antioxidation, wear resistance, corrosion resistance and the like of ZDDP in the lubricating oil are replaced, and the same or better performance as the zinc-containing railway locomotive diesel engine oil can be achieved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of lubricating oil additives, and particularly relates to a zinc-free type railway locomotive diesel engine lubricating oil composition and a preparation method of the railway locomotive diesel engine lubricating oil composition. BACKGROUND

[0002] Compared with common diesel engines, railway locomotive diesel engines have the characteristics of large horsepower, high peak torque, low speed, large displacement and the like. Another significant difference is that some railway locomotive diesel engines use bearing parts plated with silver at parts such as superchargers and crankpin. Since zinc salt additives have a corrosive effect on silver, the railway locomotive diesel engines need to use lubricating oil without zinc. The zinc in the lubricating oil mainly comes from anti-wear and corrosion inhibitors (zinc dialkyldithiophosphate, ZDDP). The additive has multiple functions such as oxidation resistance, corrosion resistance and wear resistance, and is a commonly used multifunctional additive in engine lubricating oil.

[0003] Chinese patent (application number: 201910958561.5, publication number: CN112646646A) discloses a railway locomotive oil composition, which is composed of 4-10 parts of metal detergent, 2-8 parts of dispersant, 0.5-2 parts of anti-wear and corrosion inhibitor, 0.5-3 parts of composite antioxidant and 70-90 parts of base oil. The metal detergent is composed of super-high alkaline phenate with an alkaline value of 290-310 mgKOH / g, super-high alkaline sulfonate with an alkaline value of 380-420 mgKOH / g and low alkaline sulfonate with an alkaline value of 25-35 mgKOH / g. Chinese patent (application number: 201710431332.9, publication number: CN107338092A) discloses a diesel locomotive oil composition, which is composed of a) 3-10 parts of metal detergent; the metal detergent is composed of 0.5-3.5 parts of sulfonate, 0.5-3.5 parts of sulfided alkyl phenate and 2-9 parts of salicylate; b) 3-7 parts of low molecular weight polyisobutylene succinimide ashless dispersant with a molecular weight range of 3000-3200; c) 0.5-3 parts of phosphorus-containing anti-wear and corrosion inhibitor; d) 0.5-3 parts of composite antioxidant; e) 80-95 parts of base oil. Chinese patent (application number: 201610833590.5, publication number: CN106635281A) discloses a diesel locomotive oil composition, which is composed of a) 3-10 parts of metal detergent; the metal detergent is composed of 0.5-3.5 parts of sulfonate, 0.5-3.5 parts of sulfided alkyl phenate and 2-9 parts of salicylate; b) 3-7 parts of nitrogen-containing ashless dispersant; c) 0.5-3 parts of phosphorus-containing anti-wear and corrosion inhibitor; d) 0.5-3 parts of composite antioxidant; the composite antioxidant is composed of 0.1-0.5 parts of amine antioxidant, 0.1-0.5 parts of phenolic antioxidant and 0.2-1 parts of zinc sulfaminoformate; e) 80-95 parts of base oil. The above-mentioned railway diesel locomotive lubricating oil compositions contain a certain proportion of anti-wear and corrosion inhibitor ZDDP, which is not suitable for railway diesel locomotives containing silver bearings. There is no report on zinc-free railway diesel locomotive lubricating oil composition. SUMMARY

[0004] The purpose of the present application is to provide a zinc-free railway diesel locomotive lubricating oil composition with good oxidation resistance and wear resistance, which can effectively prolong the oil change cycle.

[0005] Another purpose of the present application is to provide a preparation method of the zinc-free railway diesel locomotive lubricating oil composition.

[0006] The technical scheme adopted by the present application is a zinc-free type railway locomotive diesel engine lubricating oil composition, which comprises the following components in percentage by mass: high-temperature detergent 5.0-8.0%, ashless dispersant 3.0-6.0%, multifunctional additive 2.0-4.0%, ashless antioxidant preservative 0.5-1.5%, composite antioxidant 0.5-1.5%, pour point depressant 0.2-0.5%, methyl silicone oil anti-foaming agent 0.0015-0.0050%, and the balance is catalytic hydrogenation base oil, and the sum of the mass percentages of the above components is 100%.

[0007] The present application is also characterized in that,

[0008] The high-temperature detergent comprises the following components in percentage by mass: sulfided alkyl phenate 55-65%, and the balance is alkyl salicylate, and the sum of the mass percentages of the above components is 100%.

[0009] The sulfided alkyl phenate comprises the following components in percentage by mass: medium-basicity sulfided calcium alkyl phenate 20-80%, and the balance is high-basicity sulfided calcium alkyl phenate, and the sum of the mass percentages of the above components is 100%.

[0010] The alkyl salicylate comprises the following components in percentage by mass: medium-basicity calcium alkyl salicylate 30-70%, and the balance is high-basicity calcium alkyl salicylate, and the sum of the mass percentages of the above components is 100%.

[0011] The ashless dispersant is polyisobutylene succinimide; the polyisobutylene succinimide is any one or both of single-hung polyisobutylene succinimide and double-hung polyisobutylene succinimide; and the ashless antioxidant preservative is dialkyldithiocarbamic acid ester.

[0012] The multifunctional additive is 2,3-dihydro-2,2-dimethyl-7-benzofuranyl-methyl-N-amine carbamate.

[0013] The composite antioxidant comprises the following components in percentage by mass: amine antioxidant 60-75%, and the balance is phenolic antioxidant, and the sum of the mass percentages of the above components is 100%.

[0014] The amine antioxidant is any one or both of butyloctyl diphenylamine and dioctyl diphenylamine; and the phenolic antioxidant is any one or both of 2,6-di-tert-butyl-p-cresol and high-molecular phenolic ester compound.

[0015] The catalytic hydrogenation base oil comprises the following components in percentage by mass: medium-component hydrogenation base oil 70-90%, and the balance is heavy-component hydrogenation base oil, and the sum of the mass percentages of the above components is 100%.

[0016] Another technical solution adopted by the present application is a preparation method of the zinc-free type railway locomotive diesel engine lubricating oil composition, specifically: mixing high-temperature detergent, ashless dispersant, multifunctional additive, ashless antioxidant corrosion inhibitor, composite antioxidant, pour point depressant, methyl silicone oil anti-foaming agent and catalytic hydrogenation base oil, stirring at 55-65 DEG C until uniform, to obtain the diesel engine lubricating oil composition.

[0017] The present application has the following advantages: through optimization of the high-temperature detergent, 2,3-dihydro-2,2-dimethyl-7-benzofuranyl-methyl-N-amine carbamate is introduced as an antioxidant anti-wear multifunctional additive, ashless antioxidant corrosion inhibitor is introduced, etc., replacing the antioxidant, anti-wear, corrosion resistance and other functions of ZDDP in the lubricating oil, forming a zinc-free type railway locomotive diesel engine lubricating oil composition, which can achieve the same or better performance as the zinc-containing railway locomotive diesel engine oil. DETAILED DESCRIPTION

[0018] The present application will be described in detail below in combination with specific embodiments.

[0019] The zinc-free type railway locomotive diesel engine lubricating oil composition of the present application comprises the following components by mass percentage: high-temperature detergent 5.0-8.0%, ashless dispersant 3.0-6.0%, multifunctional additive 2.0-4.0%, ashless antioxidant corrosion inhibitor 0.5-1.5%, composite antioxidant 0.5-1.5%, pour point depressant 0.2-0.5%, methyl silicone oil anti-foaming agent 0.0015-0.0050%, and the balance is catalytic hydrogenation base oil, and the sum of the mass percentages of the above components is 100%.

[0020] The high-temperature detergent comprises the following components by mass percentage: sulfided alkyl phenate 55-65%, and the balance is alkyl salicylate, and the sum of the mass percentages of the above components is 100%.

[0021] The sulfided alkyl phenate in the high-temperature detergent component is composed of medium basicity sulfided calcium alkyl phenate and high basicity sulfided calcium alkyl phenate;

[0022] The sulfided alkyl phenate comprises the following components by mass percentage: medium basicity sulfided calcium alkyl phenate 20-80%, and the balance is high basicity sulfided calcium alkyl phenate, and the sum of the mass percentages of the above components is 100%.

[0023] The medium basicity sulfided calcium alkyl phenate has a total basicity of 130-200 mgKOH / g, and the high basicity sulfided calcium alkyl phenate has a total basicity of not less than 250 mgKOH / g;

[0024] The alkyl salicylate in the high-temperature detergent component is composed of medium basicity calcium alkyl salicylate and high basicity calcium alkyl salicylate;

[0025] The alkyl salicylate comprises the following components by mass percentage: 30-70% of medium alkali value calcium alkyl salicylate, and the balance of high alkali value calcium alkyl salicylate, and the sum of the mass percentages of the above components is 100%.

[0026] The total alkali value of the medium alkali value calcium alkyl salicylate is 160-250 mgKOH / g, and the total alkali value of the high alkali value calcium alkyl salicylate is not less than 290 mgKOH / g.

[0027] The high-temperature detergent in the application does not contain sulfonate, only contains sulfided alkyl phenate and alkyl salicylate with auxiliary antioxidant performance, and the sulfided alkyl phenate with better antioxidant performance accounts for a higher proportion, which can significantly improve the antioxidant performance of the composition and partially replace the antioxidant effect of ZDDP additive.

[0028] The ashless dispersant is polyisobutylene succinimide; the polyisobutylene succinimide is any one or both of single-hung polyisobutylene succinimide and double-hung polyisobutylene succinimide.

[0029] The multifunctional additive is 2,3-dihydro-2,2-dimethyl-7-benzofuranyl-methyl-N-amine carbamate, and the structure is as follows:

[0030]

[0031] The carbamate and benzofuran group contained in the structure of the multifunctional additive can form a conjugated structure, can timely capture free radical intermediates generated in the oxidation process of engine oil, block the oxidation reaction chain, and has significant antioxidant effect; in addition, the multifunctional additive has good metal adsorption capacity, can form a firm adsorption film on the surface of engine piston ring-cylinder sleeve friction pair, crankshaft bearing friction pair and the like, and reduce friction and wear. The multifunctional additive can greatly improve the antioxidant performance and anti-wear performance of the composition of the application, and can effectively prolong the oil change cycle.

[0032] The ashless antioxidant preservative is dialkyldithiocarbamic acid ester.

[0033] The composite antioxidant comprises the following components by mass percentage: 60-75% of amine antioxidant, and the balance of phenolic antioxidant, and the sum of the mass percentages of the above components is 100%.

[0034] Too high or too low ratio of the amine antioxidant will affect the antioxidant performance of the composition of the application.

[0035] The amine antioxidant is any one or both of butyloctyl diphenylamine and dioctyl diphenylamine.

[0036] The phenolic antioxidant is any one or both of 2,6-di-tert-butyl-p-cresol and high molecular phenolic ester compound.

[0037] The catalytic hydrogenation base oil comprises the following components in percentage by mass: 70-90% of middle-component hydrogenation base oil, and the balance being heavy-component hydrogenation base oil, and the sum of the percentages by mass of the above components being 100%.

[0038] The middle-component hydrogenation base oil has a kinematic viscosity of 9.0-11.0 mm 2 / s at 100 DEG C, and a viscosity index of not less than 95; and the heavy-component hydrogenation base oil has a kinematic viscosity of 28.0-34.0 mm 2 / s at 100 DEG C, and a viscosity index of 80-90.

[0039] The preparation method of the zinc-free type railway locomotive diesel engine lubricating oil composition of the present application is as follows: high-temperature detergent, ashless dispersant, multifunctional additive, ashless anti-oxidation preservative, composite antioxidant, pour point depressant, methyl silicone oil anti-foaming agent and catalytic hydrogenation base oil are mixed, and stirred at 55 DEG C-65 DEG C until mixed uniformly, so as to obtain the diesel engine lubricating oil composition.

[0040] Example 1

[0041] The composition of the diesel engine lubricating oil composition of the present example is shown in Table 1:

[0042] Table 1 Composition and ratio of diesel engine lubricating oil composition of Example 1

[0043]

[0044]

[0045] The composition of the diesel engine lubricating oil composition of the present example is shown in Table 1:

[0046] Table 2 Composition and ratio of base oil of Example 1

[0047] Components content(%) Medium-component hydrotreated base oil 80 Heavy component hydrogenated base oil 20

[0048] Example 2

[0049] The composition of the diesel engine lubricating oil composition of the present example is shown in Table 3:

[0050] Table 3 Composition and ratio of diesel engine lubricating oil composition of Example 2

[0051]

[0052]

[0053] The composition of the diesel engine lubricating oil composition of the present example is shown in Table 1:

[0054] Table 4 Composition and ratio of base oil of Example 2

[0055] Components content(%) Medium-component hydrotreated base oil 80 Heavy component hydrogenated base oil 20

[0056] Example 3

[0057] The composition of the diesel engine lubricating oil composition of this example is shown in Table 5:

[0058] Table 5 Composition and formulation of the diesel engine lubricating oil composition of Example 3

[0059]

[0060]

[0061] The composition of the base oil is shown in Table 6:

[0062] Table 6 Composition and formulation of the base oil of Example 3

[0063] Components content(%) Medium-component hydrotreated base oil 80 Heavy component hydrogenated base oil 20

[0064] Example 4

[0065] The composition of the diesel engine lubricating oil composition of this example is shown in Table 7:

[0066] Table 7 Composition and formulation of the diesel engine lubricating oil composition of Example 4

[0067]

[0068]

[0069] The composition of the base oil is shown in Table 8:

[0070] Table 8 Composition and formulation of the base oil of Example 4

[0071] Components content(%) Medium-component hydrotreated base oil 80 Heavy component hydrogenated base oil 20

[0072] Example 5

[0073] The composition of the diesel engine lubricating oil composition of this example is shown in Table 9:

[0074] Table 9 Composition and formulation of the diesel engine lubricating oil composition of Example 5

[0075]

[0076]

[0077] The composition of the base oil is shown in Table 10:

[0078] Table 10 Composition and formulation of the base oil of Example 5

[0079] Components content(%) Medium-component hydrotreated base oil 80 Heavy component hydrogenated base oil 20

[0080] Example 6

[0081] The composition of the diesel engine lubricating oil composition of this example is shown in Table 11:

[0082] Table 11 Composition and formulation of diesel engine lubricating oil composition of Example 6

[0083] Components content(%) Medium alkali value alkylphenol calcium sulfide 2.0 High-alkalinity alkylphenol calcium sulfide 2.2 Medium-alkalinity alkyl salicylate calcium 1.4 High-alkalinity alkyl salicylate calcium 1.4 Bisuccinimide dispersant 4.0 Multifunctional additives 3.0 Ashless antioxidant preservative 1.5 bisoctyl diphenylamine 0.8 High molecular weight phenolic esters 0.4 Pour point depressant 0.3 Methyl silicone oil antifoaming agent 0.002 base oil margin

[0084] The composition of the base oil is shown in Table 12:

[0085] Table 12 Composition and formulation of base oil of Example 6

[0086] Components content(%) Medium-component hydrotreated base oil 80 Heavy component hydrogenated base oil 20

[0087] Example 7

[0088] The composition of the diesel engine lubricating oil composition of this example is shown in Table 13:

[0089] Table 13 Composition and formulation of diesel engine lubricating oil composition of Example 7

[0090] Components content(%) Medium alkali value alkylphenol calcium sulfide 2.0 High-alkalinity alkylphenol calcium sulfide 1.6 Medium-alkalinity alkyl salicylate calcium 1.2 High-alkalinity alkyl salicylate calcium 1.2 Monosuccinimide dispersant 2.0 Bisuccinimide dispersant 2.0 Multifunctional additives 3.0 Ashless antioxidant preservative 1.0 bisoctyl diphenylamine 0.7 2,6-Di-tert-butyl-p-cresol 0.3 Pour point depressant 0.3 Methyl silicone oil antifoaming agent 0.002 base oil margin

[0091] The composition of the base oil is shown in Table 14:

[0092] Table 14 Composition and formulation of base oil of Example 7

[0093] Components content(%) Medium-component hydrotreated base oil 80 Heavy component hydrogenated base oil 20

[0094] Example 8

[0095] The composition of the diesel engine lubricating oil composition of this example is shown in Table 15:

[0096] Table 15 Composition and formulation of diesel engine lubricating oil composition of Example 8

[0097] Components content(%) Medium alkali value alkylphenol calcium sulfide 2.0 High-alkalinity alkylphenol calcium sulfide 1.6 Medium-alkalinity alkyl salicylate calcium 1.2 High-alkalinity alkyl salicylate calcium 1.2 Monosuccinimide dispersant 2.0 Bisuccinimide dispersant 2.0 Multifunctional additives 4.0 Ashless antioxidant preservative 1.0 Butyloctyl diphenylamine 0.7 2,6-Di-tert-butyl-p-cresol 0.3 Pour point depressant 0.3 Methyl silicone oil antifoaming agent 0.002 base oil margin

[0098] The composition of the base oil is shown in Table 16:

[0099] Table 16 Composition and formulation of base oil of Example 8

[0100] Components content(%) Medium-component hydrotreated base oil 80 Heavy component hydrogenated base oil 20

[0101] Comparative Example 1

[0102] The composition of the diesel engine lubricating oil composition of this example is shown in Table 17:

[0103] Table 17 Composition and formulation of diesel engine lubricating oil composition of Comparative Example 1

[0104] Components content(%) Medium alkali value alkylphenol calcium sulfide 2.5 High-alkalinity alkylphenol calcium sulfide 2.5 Medium-alkalinity alkyl salicylate calcium 0.5 High-alkalinity alkyl salicylate calcium 0.5 Bisuccinimide dispersant 4.0 Zinc butyloctyl dithiophosphate (ZDDP) 2.0 Ashless antioxidant preservative 1.0 Butyloctyl diphenylamine 0.7 2,6-Di-tert-butyl-p-cresol 0.3 Pour point depressant 0.3 Methyl silicone oil antifoaming agent 0.002 base oil margin

[0105] The base oil composition is shown in Table 18.

[0106] Table 18 Base oil composition and ratio of Comparative Example 1

[0107] Components content(%) Medium-component hydrotreated base oil 80 Heavy component hydrogenated base oil 20

[0108] Comparative Example 2

[0109] The composition of the diesel engine lubricating oil composition of this comparative example is shown in Table 19.

[0110] Table 19 Composition and ratio of diesel engine lubricating oil composition of Comparative Example 2

[0111] Components content(%) Medium-alkalinity alkylphenol calcium sulfide 2.0 High-alkalinity alkylphenol calcium sulfide 1.6 Medium-alkalinity alkyl salicylate calcium 1.2 High-alkalinity alkyl salicylate calcium 1.2 Bisuccinimide dispersant 4.0 Zinc butyloctyl dithiophosphate (ZDDP) 3.0 Ashless antioxidant preservative 1.0 Butyloctyl diphenylamine 0.7 2,6-Di-tert-butyl-p-cresol 0.3 Pour point depressant 0.3 Methyl silicone oil antifoaming agent 0.002 base oil margin

[0112] The base oil composition is shown in Table 20.

[0113] Table 20 Base oil composition and ratio of Comparative Example 2

[0114] Components content(%) Medium-component hydrotreated base oil 80 Heavy component hydrogenated base oil 20

[0115] Comparative Example 3

[0116] The composition of the diesel engine lubricating oil composition of this comparative example is shown in Table 21.

[0117] Table 21 Composition and ratio of diesel engine lubricating oil composition of Comparative Example 3

[0118] Components content(%) Medium-alkalinity alkylphenol calcium sulfide 0.5 High-alkalinity alkylphenol calcium sulfide 0.5 Medium-alkalinity alkyl salicylate calcium 2.5 High-alkalinity alkyl salicylate calcium 2.5 Bisuccinimide dispersant 4.0 Multifunctional additives 2.0 Ashless antioxidant preservative 1.0 Butyloctyl diphenylamine 0.7 2,6-Di-tert-butyl-p-cresol 0.3 Pour point depressant 0.3 Methyl silicone oil antifoaming agent 0.002 base oil margin

[0119] The base oil composition is shown in Table 22.

[0120] Table 22 Base oil composition and ratio of Comparative Example 3

[0121] Components content(%) Medium-component hydrotreated base oil 80 Heavy component hydrogenated base oil 20

[0122] The diesel engine lubricating oil compositions prepared in the above examples and comparative examples were evaluated for oxidation resistance, wear resistance and high temperature detergency. The oxidation resistance was evaluated by PDSC oxidation induction period and simulated oxidation test, wherein the PDSC test temperature was 200°C and the oxygen pressure was 2.45 mPa; the simulated oxidation test temperature was 180°C, copper and steel sheets were added for catalysis, the test period was 96 h, and the change rate of the 100°C kinematic viscosity of the oil after oxidation was measured to determine the oxidation deterioration of the oil. The wear resistance was evaluated by the friction coefficient of the SRV tester and the wear scar diameter of the four-ball tester. The high temperature detergency was evaluated by the coking weight of the coking plate test. The evaluation results are shown in Table 23.

[0123] Table 23 simulation evaluation test results

[0124]

[0125]

[0126] It can be found from the test results that, with the increase of the amount of the multifunctional additive in Example 1, Example 2 and Example 3, the PDSC oxidation induction period shows an obvious increasing trend, the viscosity growth rate in the simulation oxidation test shows a downward trend, and the antioxidant performance is obviously improved; the SRV friction coefficient and the four-ball wear scar diameter both show a downward trend, and the anti-wear performance is gradually enhanced. Compared with Comparative Example 1 and Comparative Example 2 which add zinc dialkyldithiophosphate ZDDP, the antioxidant and anti-wear performance is better, which indicates that the multifunctional additive has good antioxidant and anti-wear performance.

[0127] In Example 4, Example 5 and Example 6, the proportion of the multifunctional additive is relatively low, but through increasing the proportion of the high-temperature detergent and increasing the amount of the ashless antioxidant and corrosion inhibitor, the antioxidant performance is obviously improved, which can reach the antioxidant performance level of the high multifunctional additive amount example. Compared with Comparative Example 1 and Comparative Example 2 which add zinc dialkyldithiophosphate ZDDP, the performance is equivalent or better, which indicates the beneficial effects of the optimized high-temperature detergent component and ashless antioxidant and corrosion inhibitor in the present application.

[0128] In Comparative Example 1, the proportion of sulfided alkyl phenate in the high-temperature detergent component is 83.3%, although the antioxidant performance is good, but it has an adverse effect on the high-temperature detergency. It can be found from the weight of the coking and coagulation that the weight of the coking and coagulation of this scheme is obviously large. In Comparative Example 3, the proportion of sulfided alkyl phenate in the high-temperature detergent component is 16.7%, and the higher proportion of salicylate obviously improves the high-temperature detergency, and the weight of the coking and coagulation is very low, only 25.1 mg, but the antioxidant performance is poor, the PDSC oxidation induction period is the shortest, and the viscosity growth rate in the simulation oxidation test is the largest. In Example 1-8, the proportion of sulfided alkyl phenate in the high-temperature detergent component is 55%-65%, and in this range, the oil shows a good balance between antioxidant performance and high-temperature detergency, which indicates the beneficial effects of the optimization of the high-temperature detergent component in the present application.

[0129] The analysis of the results of the examples fully shows that, through the optimization of the high-temperature detergent scheme, the introduction of 2,3-dihydro-2,2-dimethyl-7-benzofuranyl-methyl-N-amine carbamate as an antioxidant and anti-wear multifunctional additive, and the introduction of ashless antioxidant and corrosion inhibitor, etc., the ZDDP is replaced in the lubricating oil to replace the antioxidant, anti-wear, corrosion resistance and other functions, and a zinc-free type railway locomotive diesel engine lubricating oil composition is formed, which can achieve the same or better performance as the zinc-containing railway locomotive diesel engine oil.

Claims

1. A zinc-free railroad locomotive diesel engine lubricating oil composition characterized in that, The diesel engine lubricating oil composition comprises the following components in percentage by mass: high-temperature detergent 5.0-8.0%, ashless dispersant 3.0-6.0%, multifunctional additive 2.0-4.0%, ashless antioxidant preservative 0.5-1.5%, composite antioxidant 0.5-1.5%, pour point depressant 0.2-0.5%, methyl silicone oil antifoam agent 0.0015-0.0050%, and the balance is catalytic hydrogenation base oil; The high-temperature detergent comprises the following components in percentage by mass: sulfidized alkyl phenate 55-65% and the balance is alkyl salicylate; The sulfidized alkyl phenate comprises the following components in percentage by mass: medium-basicity sulfidized alkyl phenate calcium 20-80% and the balance is high-basicity sulfidized alkyl phenate calcium; The alkyl salicylate comprises the following components in percentage by mass: medium-basicity alkyl salicylate calcium 30-70% and the balance is high-basicity alkyl salicylate calcium, and the sum of the mass percentages of the above components is 100%; The multifunctional additive is 2,3-dihydro-2,2-dimethyl-7-benzofuranyl-methyl-N-amine carbamate, and its structure is as follows: The catalytic hydrogenation base oil comprises the following components in percentage by mass: medium-component hydrogenation base oil 70-90% and the balance is heavy-component hydrogenation base oil; The kinematic viscosity at 100℃ of the middle component hydrogenated base oil is 9.0-11.0 mm 2 / s, the viscosity index is not less than 95; the kinematic viscosity at 100℃ of the heavy component hydrogenated base oil is 28.0-34.0 mm 2 / s, the viscosity index is 80-90.

2. The zinc-free locomotive diesel lubricating oil composition of claim 1, wherein, The ashless dispersant is polyisobutylene succinimide, and the polyisobutylene succinimide is any one or both of single-hung polyisobutylene succinimide and double-hung polyisobutylene succinimide; and the ashless antioxidant preservative is dialkyl dithiocarbamate.

3. The zinc-free railroad locomotive diesel lubricant composition of claim 1, wherein, The composite antioxidant comprises the following components in percentage by mass: amine antioxidant 60-75% and the balance is phenolic antioxidant.

4. The zinc-free railroad locomotive diesel lubricant composition of claim 3, wherein, The amine antioxidant is any one or both of butyl octyl diphenylamine and dioctyl diphenylamine, and the phenolic antioxidant is any one or both of 2,6-di-tert-butyl-p-cresol and high-molecular phenolic ester compound.

5. The method of making a zinc-free railroad locomotive diesel lubricating oil composition according to any one of claims 1 to 4, characterized in that, Specifically, the high-temperature detergent, ashless dispersant, multifunctional additive, ashless antioxidant preservative, composite antioxidant, pour point depressant, methyl silicone oil antifoam agent and catalytic hydrogenation base oil are mixed, stirred at 55-65 DEG C until uniform, and the diesel engine lubricating oil composition is obtained.

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