Lubricating oil composition for methanol engine as well as preparation method and application of lubricating oil composition

Abstract

The invention relates to the technical field of engine lubricating oil, and provides a methanol engine lubricating oil composition as well as a preparation method and application thereof. The methanol engine lubricating oil composition is prepared from the following components in parts by weight: 0.1 to 10 parts of a clearing agent, 0.1 to 10 parts of a dispersing agent, 0.1 to 5 parts of an antioxidant, 0.1 to 5 parts of an anti-wear agent, 0.001 to 1 part of an anti-foaming agent and 70 to 98 parts of base oil, wherein the anti-wear agent comprises thiocarbamate. According to the methanol engine lubricating oil composition provided by the invention, thiocarbamate is adopted as the anti-wear agent, so that decomposition of an anti-oxidation and anti-wear agent in lubricating oil and damage of a friction film caused by methanol and formic acid can be effectively resisted, and the technical problem that the anti-oxidation and anti-wear performance is insufficient when traditional engine oil is used in a methanol engine is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of engine lubricating oil, and more specifically, to a methanol engine lubricating oil composition and a preparation method and application thereof. Background Art

[0002] As the shipping industry continues to accelerate the process of decarbonization, methanol, as a new type of clean fuel for ships, has the advantages of mature technology, easy ship modification, safe use and convenient refueling, and is one of the ideal alternative fuels for achieving carbon reduction. However, the physical and chemical characteristics and combustion characteristics of methanol also put forward new requirements for the lubrication system of the engine. For example, when methanol, water and formic acid generated by combustion enter the crankcase, it will cause alkali loss and emulsification of the oil. At the same time, formic acid will cause the decomposition of antioxidants and anti-wear agents commonly used in lubricating oils, and destroy the friction film formed by lubricating oils on metal surfaces. Therefore, the use of traditional engine oils in methanol engines has the problem of insufficient anti-oxidation and anti-wear performance. For methanol engines, special lubricating oils need to be used for protection to reduce or avoid the adverse effects of formic acid on lubricating oils. Summary of the invention

[0003] The object of the present invention is to provide a methanol engine lubricating oil composition and a preparation method thereof, so as to solve the technical problem that the anti-oxidation and anti-wear performance of traditional engine oil is insufficient when used in a methanol engine.

[0004] To achieve the above object, the technical solution adopted by the present invention is:

[0005] In a first aspect, the present invention provides a methanol engine lubricating oil composition, comprising the following components in parts by weight:

[0006] Detergent: 0.1-10 parts by weight;

[0007] Dispersant: 0.1-10 parts by weight;

[0008] Antioxidant: 0.1-5 parts by weight;

[0009] Antiwear agent: 0.1-5 parts by weight;

[0010] Antifoaming agent: 0.001-1 parts by weight;

[0011] Base oil: 70-98 parts by weight;

[0012] The antiwear agent includes thiocarbamate.

[0013] In the present invention, the amount of anti-wear agent can be selected, for example, 0.1 weight part, 0.2 weight part, 0.5 weight part, 0.7 weight part, 0.8 weight part, 1 weight part, 1.2 weight parts, 1.5 weight parts, 1.8 weight parts, 2 weight parts, 2.5 weight parts, 3 weight parts, 3.2 weight parts, 3.8 weight parts, 4 weight parts, 4.5 weight parts, 4.7 weight parts, 5 weight parts, etc.

[0014] According to some embodiments of the present invention, the detergent includes at least one of sulfonates, salicylates, and sulfurized alkylphenols.

[0015] In the present invention, the detergent may be any of various commonly used brands, including but not limited to T101, T104, T106, T121, T122, etc.

[0016] In the methanol engine lubricating oil composition provided by the present invention, the detergent can neutralize the formic acid generated by methanol to prevent corrosion and wear. If the amount is too small, the acid neutralization performance and the detergent performance will be insufficient, and if the amount is too large, the water separation performance of the oil will be affected. The detergent is preferably 0.1 to 10 parts by weight, preferably 3 to 7 parts by weight.

[0017] According to some embodiments of the present invention, the dispersant includes at least one of monoalkenyl succinimide, dialkenyl succinimide, polyalkenyl succinimide, and high molecular weight succinimide. The brands of the dispersant include but are not limited to T151, T154A, T161, etc.

[0018] In the present invention, the amount of dispersant used can be selected, for example, 0.1 weight parts, 0.3 weight parts, 0.5 weight parts, 0.8 weight parts, 1 weight parts, 1.2 weight parts, 1.5 weight parts, 1.8 weight parts, 2 weight parts, 2.3 weight parts, 2.5 weight parts, 3 weight parts, 3.3 weight parts, 3.8 weight parts, 4 weight parts, 4.5 weight parts, 4.7 weight parts, 5 weight parts, 5.5 weight parts, 6 weight parts, 6.6 weight parts, 7 weight parts, 7.3 weight parts, 8 weight parts, 8.1 weight parts, 8.8 weight parts, 9 weight parts, 10 weight parts, etc.

[0019] According to some embodiments of the present invention, the antioxidant includes at least one of dioctyl zinc dithiophosphate, an amine antioxidant, a thioether antioxidant, and a phenol ester antioxidant.

[0020] According to some embodiments of the present invention, the antioxidant comprises a thioether antioxidant.

[0021] In the methanol engine lubricating oil composition provided by the present invention, the antioxidant is a thioether type antioxidant, such as T535, which can make the anti-wear and anti-oxidation properties of the lubricating oil composition better than those of other types of antioxidants.

[0022] In the present invention, the amount of antioxidant used can be selected, for example, 0.1 weight part, 0.2 weight part, 0.25 weight part, 0.3 weight part, 0.4 weight part, 0.5 weight part, 0.8 weight part, 1 weight part, 1.2 weight parts, 1.5 weight parts, 1.8 weight parts, 2 weight parts, 2.3 weight parts, 2.5 weight parts, 3 weight parts, 3.3 weight parts, 3.8 weight parts, 4 weight parts, 4.5 weight parts, 4.7 weight parts, 5 weight parts, etc.

[0023] According to some embodiments of the present invention, the antifoaming agent includes at least one of methyl silicone oil, non-silicone polymer, and silicon-containing composite antifoaming agent.

[0024] In the present invention, the amount of the antifoaming agent can be selected, for example, 0.001 weight part, 0.003 weight part, 0.005 weight part, 0.008 weight part, 0.01 weight part, 0.02 weight part, 0.035 weight part, 0.04 weight part, 0.05 weight part, 0.06 weight part, 0.075 weight part, 0.09 weight part, 0.1 weight part, 0.13 weight part, 0.15 weight part, 0.2 weight part, 0.3 weight part, 0.35 weight part, 0.4 weight part, 0.5 weight part, 0.66 weight part, 0.7 weight part, 0.73 weight part, 0.8 weight part, 0.85 weight part, 0.9 weight part, 0.94 weight part, 1 weight part, etc.

[0025] According to some embodiments of the present invention, the base oil includes at least one of Group I base oil and Group II base oil.

[0026] In a second aspect, the present invention provides a method for preparing the methanol engine lubricating oil composition described in the first aspect, comprising: adding a detergent, a dispersant, an antioxidant, an antiwear agent and an antifoaming agent to a base oil, mixing and stirring, to obtain the methanol engine lubricating oil composition.

[0027] According to some embodiments of the present invention, the temperature of the mixing and stirring is 50 to 80° C., and the time is 0.5 to 1 h.

[0028] In a third aspect, the present invention provides use of the methanol engine lubricating oil composition described in the first aspect in a methanol engine.

[0029] According to some embodiments of the present invention, the application includes application in lubrication and sealing of a methanol engine.

[0030] The beneficial effects of the present invention are at least:

[0031] The methanol engine lubricating oil composition provided by the present invention can effectively resist the decomposition of the antioxidant and anti-wear agent in the lubricating oil and the destruction of the friction film caused by methanol and formic acid by using thiocarbamate as an anti-wear agent, thereby solving the technical problem that the antioxidant and anti-wear performance of the conventional engine oil is insufficient when used in a methanol engine. Moreover, thiocarbamate, as an ashless anti-wear agent, can reduce the ash content of the lubricating oil, reduce carbon deposition and reduce wear. DETAILED DESCRIPTION

[0032] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments. It should be understood that the specific embodiments described herein are only used to explain this patent in detail and do not limit the scope of protection of the present invention in any way.

[0033] Unless otherwise defined, the technical terms used in the following examples have the same meanings as those generally understood by those skilled in the art to which the present invention belongs. The reagents used in the following examples, unless otherwise specified, are all conventional biochemical reagents; the raw materials, instruments and equipment used in the following examples, etc., can all be purchased on the market or can be obtained by existing methods; the reagent amounts, unless otherwise specified, are the reagent amounts used in conventional experimental operations; the experimental methods, unless otherwise specified, are all conventional methods.

[0034] In the various embodiments and comparative examples of the present invention, the amount of each component used is in parts by weight.

[0035] Example 1

[0036] A methanol engine lubricating oil composition, comprising:

[0037] Base oil: 65.3 parts of Class II base oil, 26 parts of Class I bright oil;

[0038] Detergent: 3 parts of high base synthetic calcium sulfonate T106, 2 parts of low base synthetic calcium sulfonate T104, 1.2 parts of high base sulfurized alkyl phenol calcium T122;

[0039] Dispersant: 1 part of bis(vinyl)succinimide T154A;

[0040] Antioxidant: 0.3 parts of thioether antioxidant T535;

[0041] Antiwear agent: 1.2 parts of thiocarbamate T323;

[0042] Anti-foaming agent: 0.05 parts of methyl silicone oil T901.

[0043] The preparation method of the methanol engine lubricating oil composition comprises:

[0044] The above detergent, dispersant, antioxidant, anti-wear agent and anti-foaming agent are prepared in proportion, the mixture is added to the base oil at 60°C, and stirred for 1.5 hours until uniform to obtain a methanol engine lubricating oil composition.

[0045] Embodiment 2-5

[0046] The preparation methods of the methanol engine lubricating oil compositions of Examples 2-5 refer to those of Example 1, with the only difference being the selection of the components and the amounts used, as shown in Table 1 for details.

[0047] Comparative Examples 1-3

[0048] The preparation methods of the lubricating oil compositions of Comparative Examples 1-3 refer to that of Example 1, except that the selection of components and the amounts thereof are different. For details, see Table 1.

[0049] Table 1 Statistics of components and dosage of lubricating oil compositions of Examples 1-5 and Comparative Examples 1-3

[0050]

[0051] The anti-oxidation performance and anti-wear performance of the lubricating oil compositions prepared in each embodiment and comparative example were tested by the lubricant load-bearing capacity determination (four-ball method) and the lubricating oil oxidation induction period determination method, respectively. The test results are shown in Table 2.

[0052] Determination of lubricant load capacity (four-ball method) (GB / T 3142): The greater the maximum non-seizure load PB and the greater the sintering load PD value, the better the extreme pressure anti-wear performance of the oil. In order to further investigate the effect of methanol and formic acid on the anti-wear performance of the lubricating oil composition, a four-ball anti-wear test was performed after adding 0.8wt% methanol and 0.2wt% formic acid to the oil with reference to the test method of GB / T3142.

[0053] Determination of oxidation induction period of lubricating oil (pressure differential scanning calorimetry) (SH / T 0719): The longer the oxidation induction period of the oil, the better the antioxidant performance.

[0054] Table 2 Lubricating oil composition performance test data statistics

[0055]

[0056] It can be seen from the above test results that in the methanol engine lubricating oil composition provided by the present invention, the antiwear agent includes thiocarbamate, which can reduce the decomposition of the antiwear agent by methanol and formic acid, and is suitable for use in methanol engines. The lubricating oil composition prepared by using thiocarbamate alone as the antiwear agent has the best effect of reducing the decomposition of the antiwear agent by methanol and formic acid.

[0057] It should be noted that the embodiments described above are only used to explain the present invention and do not constitute any limitation to the present invention. The present invention has been described with reference to typical embodiments, but it should be understood that the words used therein are descriptive and explanatory words, rather than restrictive words. The present invention may be modified as specified within the scope of the claims of the present invention, and the present invention may be revised without departing from the scope and spirit of the present invention. Although the present invention described therein relates to specific methods, materials and embodiments, it does not mean that the present invention is limited to the specific examples disclosed therein, on the contrary, the present invention can be extended to all other methods and applications with the same functions.

Claims

1. A methanol engine lubricating oil composition, characterized in that: The composition comprises the following components in parts by weight: Detergent: 0.1-10 parts by weight; Dispersant: 0.1-10 parts by weight; Antioxidant: 0.1-5 parts by weight; Antiwear agent: 0.1-5 parts by weight; Antifoaming agent: 0.001-1 parts by weight; Base oil: 70-98 parts by weight; The antiwear agent includes thiocarbamate.

2. The methanol engine lubricating oil composition according to claim 1, characterized in that: The detergent includes at least one of sulfonates, salicylates, and sulfurized alkylphenols.

3. The methanol engine lubricating oil composition according to claim 1 or 2, characterized in that: The dispersant includes at least one of monoalkenyl succinimide, bisalkenyl succinimide, polyalkenyl succinimide, and high molecular weight succinimide.

4. The methanol engine lubricating oil composition according to any one of claims 1 to 3, characterized in that: The antioxidant includes at least one of dioctyl dithiophosphate zinc salt, amine antioxidant, thioether antioxidant, and phenol ester antioxidant; preferably, the thioether antioxidant.

5. The methanol engine lubricating oil composition according to any one of claims 1 to 4, characterized in that: The antifoaming agent includes at least one of methyl silicone oil, non-silicone polymer, and silicon-containing composite antifoaming agent.

6. The methanol engine lubricating oil composition according to any one of claims 1 to 5, characterized in that: The base oil includes at least one of Group I base oil and Group II base oil.

7. A method for preparing a methanol engine lubricating oil composition according to any one of claims 1 to 6, characterized in that: include: The methanol engine lubricating oil composition can be prepared by adding detergent, dispersant, antioxidant, anti-wear agent and anti-foaming agent into the base oil, mixing and stirring.

8. The preparation method according to claim 7, characterized in that: The mixing and stirring is performed at a temperature of 50 to 80° C. and for a time of 0.5 to 1 h.

9. Use of the methanol engine lubricating oil composition according to any one of claims 1 to 6 in a methanol engine.

10. The use according to claim 9, characterized in that: The applications include lubrication and sealing of methanol engines.

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