A lubricating oil composition for a methanol engine, and a method for producing and using the same

Abstract

The present application relates to the technical field of engine lubricating oil, and provides a methanol engine lubricating oil composition, a preparation method and application thereof.The methanol engine lubricating oil composition comprises 0.1-10 parts by weight of a detergent, 0.1-10 parts by weight of a dispersant, 0.1-5 parts by weight of an antioxidant, 0.1-5 parts by weight of an anti-wear agent, 0.001-1 parts by weight of an antifoaming agent and 70-98 parts by weight of a base oil; the anti-wear agent comprises a thio carbamate.The methanol engine lubricating oil composition provided by the present application can effectively resist the decomposition of the anti-oxidant and anti-wear agent in the lubricating oil and the damage of the friction film caused by methanol and formic acid by using a thio carbamate as the anti-wear agent, and solves the technical problem of insufficient anti-oxidant and anti-wear performance of the conventional engine oil when used in a methanol engine.

Description

Technical Field

[0001] This invention relates to the field of engine lubricating oil technology, and more specifically, to a methanol engine lubricating oil composition, its preparation method, and its application. Background Technology

[0002] As the shipping industry accelerates its decarbonization process, methanol, as a new type of clean marine fuel, boasts advantages such as mature technology, minimal ship conversion difficulty, safe use, and convenient refueling, making it one of the ideal alternative fuels for achieving carbon reduction. However, the physicochemical characteristics and combustion properties of methanol also place new demands on the engine's lubrication system. For example, when methanol reacts with water and formic acid generated during combustion and enters the crankcase, it can cause alkali loss and emulsification in the oil. Simultaneously, formic acid can decompose commonly used antioxidants and anti-wear agents in lubricating oils and damage the friction film formed by the lubricating oil on metal surfaces. Therefore, using traditional engine oils in methanol engines presents insufficient antioxidant and anti-wear properties. Specialized lubricating oils are needed to protect methanol engines and reduce or avoid the adverse effects of formic acid on the lubricating oil. Summary of the Invention

[0003] The purpose of this invention is to provide a methanol engine lubricating oil composition and its preparation method, so as to solve the technical problem of insufficient anti-oxidation and anti-wear properties of traditional engine oils when used in methanol engines.

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

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

[0006] Cleaning agent: 0.1–10 parts by weight;

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

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

[0009] Anti-wear agent: 0.1–5 parts by weight;

[0010] Antifoaming agent: 0.001 to 1 part by weight;

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

[0012] The anti-wear agent includes thiocarbamate.

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

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

[0015] In this invention, the cleaning agent can be selected from various commonly used brands of cleaning agents, including but not limited to T101, T104, T106, T121, T122, etc.

[0016] In the methanol engine lubricating oil composition provided by this invention, the detergent can neutralize the formic acid generated from methanol, preventing corrosion and wear. Insufficient dosage will result in inadequate acid neutralization and detergent performance, while excessive dosage will affect the oil's water separation properties. A dosage of 0.1–10 parts by weight is preferred, and more preferably 3–7 parts by weight.

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

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

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

[0020] According to some embodiments of the present invention, the antioxidant includes thioether-type antioxidants.

[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 other types of antioxidants.

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

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

[0024] In this invention, the amount of antifoaming agent can be selected from, for example, 0.001 parts by weight, 0.003 parts by weight, 0.005 parts by weight, 0.008 parts by weight, 0.01 parts by weight, 0.02 parts by weight, 0.035 parts by weight, 0.04 parts by weight, 0.05 parts by weight, 0.06 parts by weight, 0.075 parts by weight, 0.09 parts by weight, 0.1 parts by weight, 0.13 parts by weight, 0.15 parts by weight, 0.2 parts by weight, 0.3 parts by weight, 0.35 parts by weight, 0.4 parts by weight, 0.5 parts by weight, 0.66 parts by weight, 0.7 parts by weight, 0.73 parts by weight, 0.8 parts by weight, 0.85 parts by weight, 0.9 parts by weight, 0.94 parts by weight, 1 part by weight, 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 anti-wear agent and an anti-foaming agent to a base oil, mixing and stirring, thereby obtaining the methanol engine lubricating oil composition.

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

[0028] Thirdly, the present invention provides the application 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 applications in the lubrication and sealing of methanol engines.

[0030] The beneficial effects of this invention are at least as follows:

[0031] The methanol engine lubricating oil composition provided by this invention, by employing thiocarbamate as an anti-wear agent, can effectively resist the decomposition of antioxidants and anti-wear agents in the lubricating oil and the damage to the friction film caused by methanol and formic acid, thus solving the technical problem of insufficient antioxidant and anti-wear performance of traditional engine oils used in methanol engines. Furthermore, as an ashless anti-wear agent, thiocarbamate can reduce the ash content of the lubricating oil, reduce carbon deposits, and simultaneously reduce wear. Detailed Implementation

[0032] To make the technical problem to be solved, the technical solution, and the beneficial effects of this invention clearer, the invention will be further described in detail below with reference to specific embodiments. It should be understood that the specific embodiments described herein are merely for illustrating this patent and do not limit the scope of protection of this invention in any way.

[0033] Unless otherwise defined, the technical terms used in the following embodiments have the same meaning as commonly understood by those skilled in the art. Unless otherwise specified, the reagents used in the following embodiments are conventional biochemical reagents; the raw materials, instruments, and equipment used in the following embodiments can all be obtained commercially or by existing methods; unless otherwise specified, the reagent dosages are those used in routine experimental operations; unless otherwise specified, the experimental methods are conventional methods.

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

[0035] Example 1

[0036] A methanol engine lubricating oil composition comprising:

[0037] Base oils: 65.3 parts of Group II base oils and 26 parts of Group I bright oils;

[0038] Detergent: 3 parts of high-alkalinity synthetic calcium sulfonate T106, 2 parts of low-alkalinity synthetic calcium sulfonate T104, and 1.2 parts of high-alkalinity alkylphenol calcium sulfide T122;

[0039] Dispersant: 1 part of diene succinimide T154A;

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

[0041] Anti-wear agent: 1.2 parts of thiocarbamate T323;

[0042] Antifoaming agent: 0.05 parts of methyl silicone oil T901.

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

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

[0045] Examples 2-5

[0046] The preparation methods of the methanol engine lubricating oil compositions in Examples 2-5 are the same as those in Example 1, except that the selection and dosage of each component are different, as detailed in Table 1.

[0047] Comparative Examples 1-3

[0048] The preparation methods of the lubricating oil compositions of Comparative Examples 1-3 are the same as those of Example 1, except that the selection and dosage of each component are different, as detailed in Table 1.

[0049] Table 1. Statistical table of lubricating oil composition components and dosages in Examples 1-5 and Comparative Examples 1-3

[0050]

[0051] The antioxidant and anti-wear properties of the lubricating oil compositions prepared in each example and comparative example were tested using the lubricant load-carrying capacity determination method (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-Carrying Capacity (Four-Ball Method) (GB / T 3142): The larger the maximum non-seizure load PB and the larger the sintering load PD value, the better the extreme pressure anti-wear performance of the oil. To further investigate the effects of methanol and formic acid on the anti-wear performance of the lubricating oil composition, a four-ball anti-wear test was conducted after adding 0.8 wt% methanol and 0.2 wt% formic acid to the oil, referring to the test method of GB / T 3142.

[0053] Lubricating oil oxidation induction period determination method (pressure differential scanning calorimetry) (SH / T 0719): The longer the oxidation induction period of the oil, the better its antioxidant properties.

[0054] Table 2 Statistical Table of Performance Test Data of Lubricating Oil Composition

[0055]

[0056] The above test results show that the methanol engine lubricating oil composition provided by this invention includes thiocarbamate as an anti-wear agent, which can reduce the decomposition of the anti-wear agent by methanol and formic acid, making it suitable for use in methanol engines. Furthermore, the lubricating oil composition prepared using thiocarbamate alone as an anti-wear agent exhibits the best effect in reducing the decomposition of the anti-wear agent by methanol and formic acid.

[0057] It should be noted that the embodiments described above are only for explaining the present invention and do not constitute any limitation on 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 terms, not limiting terms. Modifications can be made to the present invention within the scope of the claims, and revisions can be made to the present invention without departing from the scope and spirit of the present invention. Although the present invention described herein relates to specific methods, materials, and embodiments, it does not mean that the present invention is limited to the specific examples disclosed herein; on the contrary, the present invention can be extended to all other methods and applications with the same function.

Claims

1. A methanol engine lubricating oil composition, characterized in that, It consists of the following components in parts by weight: Cleaning agent: 0.1–10 parts by weight; Dispersant: 0.1–10 parts by weight; Antioxidant: 0.1–5 parts by weight; Anti-wear agent: 0.1–5 parts by weight; Antifoaming agent: 0.001~1 parts by weight; Base oil: 70~98 parts by weight; The anti-wear agent is a thiocarbamate; The antioxidant is a thioether-type antioxidant.

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

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, polyalkenyl succinimide, and high molecular weight succinimide.

4. The methanol engine lubricating oil composition according to claim 3, characterized in that, The polyene succinimide includes diene succinimide.

5. The methanol engine lubricating oil composition according to claim 1 or 2, characterized in that, The antifoaming agent includes at least one of methyl silicone oil, non-organosilicon polymer, and silicone-containing composite antifoaming agent.

6. The methanol engine lubricating oil composition according to claim 1 or 2, 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 as described in any one of claims 1-6, characterized in that, include: The methanol engine lubricating oil composition is prepared by adding detergents, dispersants, antioxidants, anti-wear agents, and anti-foaming agents to base oil and mixing them.

8. The preparation method according to claim 7, characterized in that, The mixing temperature is 50~80℃, and the time is 0.5~1h.

9. The use of the methanol engine lubricating oil composition according to any one of claims 1-6 in the lubrication and sealing of a methanol engine.

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