A railroad locomotive gear lubricating oil composition and method of making

Abstract

The present application discloses a kind of railway locomotive gear lubricating oil compositions, it contains: (A) at least one poly-a-olefin synthetic oil, or naphthenic base oil, or any combination of the above components;Lubricating oil composition contains (A) component 94.00~99.60wt%;(B) at least one antioxidant;Lubricating oil composition contains (B) component 0.1~3.0wt%;(C) at least one antiwear agent;Lubricating oil composition contains (C) component 0.2~2.0wt%;(D) at least one metal deactivator;Lubricating oil composition contains (D) component 0.1~1.0wt%.The lubricating oil composition of the present application has excellent low temperature performance, anti-rust performance, extreme pressure antiwear performance and antioxidant performance, poly-a-olefin synthetic oil and naphthenic base oil can be selected to effectively improve the low temperature performance, antioxidant performance of lubricating oil composition.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of lubricating oil, and particularly relates to a railway locomotive gear lubricating oil composition and a preparation method of the lubricating oil composition. BACKGROUND

[0002] With the rapid development of railway transportation industry in China, the pace of introducing foreign advanced locomotive products is also increasing. In recent years, China CNR Dalian Locomotive and Rolling Stock Co., Ltd. cooperates with the American EMD Company to produce HXN3 type railway locomotive, and the HXN3 type locomotive is a 6000 horsepower AC transmission main line freight railway locomotive which is improved and designed according to the Chinese railway technical specification on the basis of SD70MAC and SD90MAC type locomotives, has a locomotive axle load of 25 tons, adopts a series of advanced technologies, can single-machine tow 5000 tons of freight train on a straight line, has a maximum use speed of 120 kilometers, is a typical high-speed heavy-load working condition, and puts forward higher requirements on the extreme pressure and wear resistance of the transmission system gear box oil, the thermal oxidation stability, and the like. At present, the HXN3 type railway locomotive gear box uses oil which has more excellent performances in the anti-oxidation performance, the anti-wear performance and the anti-emulsification performance than the ordinary gear oil. SUMMARY

[0003] The purpose of the present application is to provide a railway locomotive gear lubricating oil composition which has excellent high and low temperature performances, thermal oxidation stability, anti-wear and anti-friction performances, anti-rust and anti-corrosion performances, anti-emulsification performance and anti-foaming performance, and can meet the lubricating requirements of the railway locomotive gear box gears and bearings under harsh conditions.

[0004] The technical solution adopted by the present application is a railway locomotive gear lubricating oil composition which contains:

[0005] (A) at least one poly-a-olefin synthetic oil, or synthetic naphthenic base oil, or any combination of the above components; the lubricating oil composition contains the (A) component in an amount of 94.00-99.60 wt%;

[0006] (B) at least one antioxidant; the lubricating oil composition contains the (B) component in an amount of 0.1-3.0 wt%;

[0007] (C) at least one anti-wear agent; the lubricating oil composition contains the (C) component in an amount of 0.2-2.0 wt%;

[0008] (D) at least one metal deactivator; the lubricating oil composition contains the (D) component in an amount of 0.1-1.0 wt%.

[0009] The present application is also characterized in that,

[0010] (A) component is synthetic naphthenic base oil, including the following components by mass percentage: monocyclic naphthenes 0-20%, bicyclic naphthenes 10-30%, tricyclic naphthenes 20-30%, tetracyclic naphthenes 10-30%, pentacyclic naphthenes 0-20%, hexacyclic naphthenes 0-20%.

[0011] (B) component is sulfurized alkyl phenol, wherein the alkyl group is 8-24 carbon atoms.

[0012] (C) component is dialkyldisulfide, or dialkylaryldisulfide, or a mixture of any combination thereof.

[0013] The alkyl group in dialkyldisulfide is 4-18 carbon atoms; the alkyl group in dialkylaryldisulfide is 1-8 carbon atoms.

[0014] (D) component is alkyl benzene pyrazole, wherein the alkyl group is 3-18 carbon atoms.

[0015] The beneficial effects of the present application are: the lubricating oil composition of the present application has excellent low temperature performance, anti-rust performance, extreme pressure and wear resistance, and antioxidant performance, selecting poly-a-olefin synthetic oil and naphthenic base oil can effectively improve the low temperature performance and antioxidant performance of the lubricating oil composition, the present application is to realize the above-mentioned purpose, carefully selecting each base oil and additive component in the lubricating oil composition, and comprehensively and systematically studying each component oil, each component functional additive and the interaction between the base oil and the additive, taking the thermal oxidation stability of the lubricating oil composition as the research focus, in order to achieve the purpose of the lubricating oil composition of the present application to meet the good lubrication of railway locomotive gear box gears and bearings under harsh conditions, prolong the oil change cycle of lubricating oil, and save the maintenance and oil change cost of railway locomotive. DETAILED DESCRIPTION

[0016] The present application will be described in detail below in combination with specific embodiments.

[0017] The present application is a kind of railway locomotive gear lubricating oil composition, which contains:

[0018] (A) at least one poly-a-olefin synthetic oil, or synthetic naphthenic base oil, or any combination of the above components; the lubricating oil composition contains 94.00-99.60wt% of component (A);

[0019] Synthetic naphthenic base oil, including the following components by mass percentage: monocyclic naphthenes 0-20%, bicyclic naphthenes 10-30%, tricyclic naphthenes 20-30%, tetracyclic naphthenes 10-30%, pentacyclic naphthenes 0-20%, hexacyclic naphthenes 0-20%;

[0020] (B) at least one antioxidant; the (B) component is a sulfurized alkyl phenol wherein the alkyl group is 8 to 24 carbon atoms; the lubricating oil composition contains 0.1 to 3.0 wt% of the (B) component;

[0021] (C) at least one anti-wear agent; the (C) component is a dialkyldisulfide, or a dialkylaryldisulfide, or a mixture of any combination thereof; the lubricating oil composition contains 0.2 to 2.0 wt% of the (C) component;

[0022] the alkyl group in the dialkyldisulfide is 4 to 18 carbon atoms;

[0023] the alkyl group in the dialkylaryldisulfide is 1 to 8 carbon atoms;

[0024] (D) at least one metal deactivator; the (D) component is an alkyl benzotriazole wherein the alkyl group is 3 to 18 carbon atoms; the lubricating oil composition contains 0.1 to 1.0 wt% of the (D) component.

[0025] A method for preparing a lubricating oil composition for railway locomotive gears of the present invention is as follows: the (A) component is added into a stainless steel mixing kettle with a stirrer, then the antioxidant (B), the anti-wear agent (C) and the metal deactivator (D) are added into the mixing kettle, the temperature is raised to 50 to 60°C, and the mixture is stirred for 4 hours until it is homogeneous and transparent, and then the lubricating oil composition is obtained.

[0026] In order to screen the base oil component, the additive component and the lubricating oil composition, various test methods are used in the laboratory for simulation evaluation. Among them, there are copper strip corrosion test (ASTM D130), anti-rust test (ASTM D665), lubricating oil oxidation stability determination method (rotating oxygen bomb method) (SH / T 0193), oxidation life test (ASTM D943) and the like.

[0027] Example 1:

[0028] The lubricating oil composition (I) comprises: 70.50 wt% of poly-α-olefin synthetic base oil mPAO150, 7.90 wt% of poly-α-olefin synthetic base oil PAO6, 20.00 wt% of synthetic naphthenic base oil (component A); 0.55 wt% of sulfurized dodecyl phenol (component B); 0.95 wt% of dioctyl disulfide, 0.10 wt% of dialkylaryldisulfide (component C);

[0029] The lubricating oil composition (II) is the same as composition (I) except that ester oil is used to replace the synthetic naphthenic base oil, and the analysis results are shown in Table 1.

[0030] Table 1 Main properties and performances of compositions (I) (II)

[0031] Item Composition (I) Composition (II) Rotating oxygen bomb test / min 2236 201

[0032] The test results show that oils blended with polyalphaolefin synthetic base oils and synthetic cycloalkanes have superior antioxidant properties compared to oils blended with polyalphaolefin synthetic base oils and ester oils.

[0033] Example 2:

[0034] Lubricating oil composition (III) comprises: 70.50 wt% of polyalphaolefin synthetic base oil mPAO150, 6.2 wt% of polyalphaolefin synthetic base oil PAO6, 20.00 wt% of synthetic naphthenic base oil (component A); 3.00 wt% of sulfurized dodecylphenol (component B); 0.10 wt% of dioctyl disulfide, 0.10 wt% of dialkylaryl disulfide (component C); and 0.10 wt% of octylbenzotriazole (component D).

[0035] The lubricating oil composition (Ⅳ) is identical to composition (Ⅲ) except that 2,6-di-tert-butyl-p-cresol acrylate is used instead of sulfurized dodecylphenol. The analytical results are shown in Table 2.

[0036] Table 2 Main properties and performance of compositions (III) and (IV)

[0037]

[0038] The test results show that sulfurized dodecylphenol is more favorable to the ASTM D943 oxidation life test than 2,6-di-tert-butyl-p-cresol acrylate, and has better antioxidant properties.

[0039] Example 3:

[0040] A lubricating oil composition (V) comprising: 70.50 wt% of polyalphaolefin synthetic base oil mPAO150, 7.30 wt% of polyalphaolefin synthetic base oil PAO6, 20.00 wt% of synthetic naphthenic base oil (component A); 0.10 wt% of sulfurized dodecylphenol (component B); 2.00 wt% of dioctyl disulfide (component C); and 0.10 wt% octylbenzotriazole (component D).

[0041] The lubricating oil composition (VI) is identical to composition (VI) except that dioctyl thiocarbamate is used instead of dioctyl disulfide. The analytical results are shown in Table 3.

[0042] Table 3 Main properties and performance of compositions (V) and (VI)

[0043]

[0044]

[0045] The test results show that dioctyl disulfide has superior extreme pressure anti-wear properties compared to dioctyl thiocarbamate.

[0046] Example 4:

[0047] The lubricating oil composition (VII) comprises: 70.50 wt% of polyalphaolefin synthetic base oil mPAO150, 8.20 wt% of polyalphaolefin synthetic base oil PAO6, 20.00 wt% of synthetic naphthenic base oil (component A); 0.10 wt% of sulfurized dodecylphenol (component B); 0.10 wt% of dioctyl disulfide, 0.10 wt% of dialkylaryl disulfide (component C); and 1.00 wt% of octylbenzotriazole (component D).

[0048] The lubricating oil composition (VIII) is identical to composition (VII) except that methylbenzotriazole is used instead of octylbenzotriazole. The analytical results are shown in Table 4.

[0049] Table 4. Main properties and performance of compositions (VII) and (VIII)

[0050] Item Composition (VII) Composition (VIII) Copper sheet corrosion (100°C, 3h) / grade 1b 2e Liquid rust test No rust Medium rust

[0051] The test results show that octylbenzotriazole has better corrosion resistance and rust prevention properties than methylbenzotriazole.

[0052] Example 5:

[0053] The lubricating oil composition (IX) comprises: 70.50 wt% of polyalphaolefin synthetic base oil mPAO150, 7.85 wt% of polyalphaolefin synthetic base oil PAO6, 20.00 wt% of synthetic naphthenic base oil (component A); 0.55 wt% of sulfurized dodecylphenol (component B); 0.9 wt% of dioctyl disulfide, 0.10 wt% of dialkylaryl disulfide (component C); and 0.10 wt% of octylbenzotriazole (component D). The analytical results are shown in Table 5.

[0054] Table 5 Main properties and performance of composition (IX)

[0055]

[0056] Compared with the reference oil, the composition (IX) of the present invention has better low-temperature performance, rust prevention performance, extreme pressure anti-wear performance and oxidation resistance, especially with a rotating oxygen bomb test life of up to 2833 minutes, which can extend the service life of lubricating oil.

Claims

1. A railway locomotive gear lubricating oil composition, characterized in that, It contains: (A) A composition of poly-α-olefin synthetic oil and synthetic cycloalkane base oil; the lubricating oil composition contains 94.00–99.60 wt% of component (A); (B) At least one antioxidant; the lubricating oil composition contains 0.1 to 3.0 wt% of component (B); (C) At least one anti-wear agent; the lubricating oil composition contains 0.2 to 2.0 wt% of component (C); (D) At least one metal passivating agent; the lubricating oil composition contains 0.1 to 1.0 wt% of component (D); Component (B) is a sulfurized alkylphenol, wherein the alkyl group has 8-24 carbon atoms; Component (C) is a dialkyl disulfide, or a dialkylaryl disulfide, or a mixture of any combination thereof; the alkyl group in the dialkyl disulfide has 4-18 carbon atoms; the alkyl group in the dialkylaryl disulfide has 1-8 carbon atoms. The (D) component is an alkylbenzenetriazole, wherein the alkyl group has 3-18 carbon atoms.

2. A method for preparing the railway locomotive gear lubricating oil composition as described in claim 1, characterized in that, Specifically, component (A) is added to a stainless steel mixing vessel equipped with a stirrer, and then antioxidant (B), anti-wear agent (C) and metal passivator (D) are added to the mixing vessel and stirred to react, thereby obtaining a lubricating oil composition.

3. The method for preparing a railway locomotive gear lubricating oil composition as described in claim 2, characterized in that, The reaction temperature is 50–60℃, and the reaction time is 4 hours.

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