Methanol engine lubricating oil composition and preparation method thereof

Abstract

The invention relates to the technical field of engine lubricating oil, in particular to a methanol engine lubricating oil composition and a preparation method thereof. The methanol engine lubricating oil composition provided by the invention is prepared from the following components on the basis of the mass of the methanol engine lubricating oil composition: 80%-98% of lubricating oil base oil, 0.7%-1.2% of calcium sulfonate, 0.3%-0.5% of magnesium sulfonate, 0.5%-0.8% of an antioxidant, wear-resistant and corrosion-resistant additive and 6.0%-8.0% of an antioxidant, the antioxidant, anti-wear and anti-corrosion additive comprises zinc dialkyl dithiophosphate; the antioxidant comprises at least two of an ester compound, a phenolic compound or an amine compound. A low-ash engine oil scheme is adopted, in-cylinder abrasion and engine preignition and knocking phenomena caused by the sediment problem can be reduced, the acid neutralization capacity and the corrosion resistance can be improved, good oxidation resistance is provided under the condition that the use amount of the antioxidant and anti-wear additive is reduced, and the oil change period of an oil product is prolonged.

Description

Technical Field

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

[0002] Methanol fuel, as a new type of alternative energy, has a wide range of application prospects, and using green methanol as a power source for automobiles is a new idea for energy conservation and emission reduction in my country's automobile industry. Methanol has a wide range of sources and can be produced from coal, oil, natural gas, electricity, etc. It is one of the fuel products with the most abundant raw materials. Green methanol, as a new type of energy, promotes the construction of green methanol ecology, and is also a rational choice to give full play to my country's resource endowment advantages. It is helpful for my country's industrial transformation and upgrading and moving towards a modern industrial system.

[0003] In the automotive field, compared with traditional diesel and compressed natural gas (CNG) fuels, methanol has different effects on the engine due to its fuel properties and combustion products, which makes the lubricating oil of methanol engines different from traditional engines. For example, compared with ordinary engine lubricating oil, methanol engine lubricating oil requires better acid neutralization and alkali retention, better antioxidant capacity and better anti-wear performance. Lubricating oil is the "blood" of the engine, and the quality of its performance directly affects the power, safety and reliability of the methanol engine. However, there is currently no development and standard for methanol engine lubricating oil, or the methanol engine lubricating oil developed by the prior art still has the defects of high ash content, acid neutralization ability, and antioxidant and corrosion resistance that need to be improved. Therefore, it is necessary to develop a special lubricating oil suitable for methanol engines. Summary of the invention

[0004] In view of this, the present invention aims to solve one of the technical problems in the related art to at least a certain extent. To this end, the present invention provides a methanol engine lubricating oil composition and a preparation method thereof, which can reduce the ash content of the methanol engine lubricating oil and improve its acid neutralization ability and anti-oxidation and anti-corrosion properties.

[0005] In order to solve the above technical problems, this application is implemented as follows:

[0006] According to one aspect of the present application, an embodiment of the present application provides a methanol engine lubricating oil composition. Based on the mass of the methanol engine lubricating oil composition, the methanol engine lubricating oil composition includes the following components:

[0007] 80% to 98% of lubricating oil base oil, 0.7% to 1.2% of calcium sulfonate, 0.3% to 0.5% of magnesium sulfonate, 0.5% to 0.8% of antioxidant, anti-wear and anti-corrosion additives and 6.0% to 8.0% of antioxidant;

[0008] The anti-oxidation, anti-wear and anti-corrosion additives include zinc dialkyl dithiophosphate;

[0009] The antioxidant includes at least two of ester compounds, phenol compounds or amine compounds.

[0010] In addition, the methanol engine lubricating oil composition according to the present application may also have the following additional technical features:

[0011] In some embodiments, based on the mass of the methanol engine lubricating oil composition, the methanol engine lubricating oil composition includes the following components:

[0012] 80% to 98% of lubricating oil base oil, 0.78% to 1.04% of calcium sulfonate, 0.325% to 0.390% of magnesium sulfonate, 0.52% to 0.65% of antioxidant, anti-wear and anti-corrosion additives and 6.375% to 7.275% of antioxidant.

[0013] In some embodiments, the zinc dialkyl dithiophosphate includes at least one of octyl zinc thionate, bis-octyl zinc thionate, or octyl zinc thionate.

[0014] In some embodiments, the antioxidant includes a first antioxidant, a second antioxidant, a third antioxidant and a fourth antioxidant, the first antioxidant is selected from phenolic antioxidants, the second antioxidant is selected from hindered phenolic antioxidants and / or aromatic amine antioxidants, the third antioxidant is selected from ester antioxidants, and the fourth antioxidant is selected from amine antioxidants.

[0015] In some embodiments, the mass ratio of the first antioxidant, the second antioxidant, the third antioxidant and the fourth antioxidant is (2.8-3.2): (1.0-1.5): (0.01-0.08): (2.2-2.7).

[0016] In some embodiments, the mass ratio of the first antioxidant, the second antioxidant, the third antioxidant and the fourth antioxidant is (2.89-3.17): (1.13-1.43): (0.015-0.075): (2.34-2.6).

[0017] In some embodiments, the first antioxidant is selected from the antioxidant THANOX L57.

[0018] In some embodiments, the second antioxidant is selected from the antioxidant THANOX L135R.

[0019] In some embodiments, the third antioxidant is selected from methyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate.

[0020] In some embodiments, the fourth antioxidant is selected from polyisobutylene succinimide.

[0021] In some embodiments, based on the mass of the methanol engine lubricating oil composition, the methanol engine lubricating oil composition further comprises the following components:

[0022] 0.2% to 0.5% of co-emulsifier and 0.15% to 0.2% of rust inhibitor.

[0023] In some embodiments, the co-emulsifier includes VISCOPLEX 6-850.

[0024] In some embodiments, the rust inhibitor includes Irgamet 30.

[0025] In some embodiments, based on the mass of the methanol engine lubricating oil composition, the methanol engine lubricating oil composition further comprises the following components:

[0026] 0.1% to 0.5% of pour point depressant, 0.3% to 0.7% of thickener, 0.02% to 0.08% of friction reducer and 0.003% to 0.007% of anti-foaming agent.

[0027] In some of these embodiments, the pour point depressant comprises VISCOPLEX 1-248.

[0028] In some of the embodiments, the thickener includes SV203.

[0029] In some of these embodiments, the friction reducing agent includes molybdenum dialkyl dithiophosphate.

[0030] In some embodiments, the anti-foaming agent includes a non-silicon anti-foaming agent.

[0031] In some embodiments, the lubricating oil base oil includes a first hydrorefined base oil and a second hydrorefined base oil in a mass ratio of (70-80):(10-18).

[0032] In some embodiments, the first hydrotreated base oil includes base oil Yubase 6; and the second hydrotreated base oil includes base oil Yubase 4.

[0033] According to another aspect of the present application, an embodiment of the present application provides a method for preparing a methanol engine lubricating oil composition, the method comprising:

[0034] Add lubricating base oil into a container and perform a first heating and stirring;

[0035] Calcium sulfonate, magnesium sulfonate, antioxidant, anti-wear and anti-corrosion additives and an antioxidant are added into a container to obtain a mixture, and the mixture is subjected to a second heating and stirring, wherein the antioxidant, anti-wear and anti-corrosion additive includes zinc dialkyl dithiophosphate, and the antioxidant includes at least two of ester compounds, phenolic compounds or amine compounds, to obtain a methanol engine lubricating oil composition.

[0036] In some embodiments, the mixture further includes an emulsifier, a rust inhibitor, a pour point depressant, a thickener and a friction reducer.

[0037] In some embodiments, after the second heating and stirring, the method further comprises: adding an anti-foaming agent to the mixture, and then continuing to stir.

[0038] In some embodiments, the heating temperature of the first heating and stirring is 40° C. to 60° C., the stirring speed is 200 to 400 r / min, and the stirring time is 45 min to 70 min.

[0039] In some embodiments, the second heating and stirring process has a heating temperature of 50° C. to 65° C., a stirring speed of 200 to 400 r / min, and a stirring time of 1 h to 2 h.

[0040] In some embodiments, the stirring speed of the continued stirring is 200 to 400 r / min, and the stirring time is 10 to 20 min.

[0041] Implementing the technical solution of the present invention has at least the following beneficial effects:

[0042] In the present application, the provided methanol engine lubricating oil composition includes lubricating oil base oil, calcium sulfonate, magnesium sulfonate, antioxidant, anti-wear and anti-corrosion additives and antioxidants, wherein the antioxidant, anti-wear and anti-corrosion additives include dialkyl dithiophosphate zinc; the antioxidant includes at least two of ester compounds, phenolic compounds or amine compounds. Therefore, the present invention can reduce the cylinder wear caused by the deposit problem and the engine pre-ignition and knock phenomenon by reducing the ash content of the lubricating oil, and can alleviate the negative impact of the hard deposits; and reduce the main component of petroleum calcium sulfonate as a detergent dispersant, and solve the detergent dispersibility through petroleum magnesium sulfonate; the technology of the low-ash lubricating oil additive combination can achieve the effect comparable to that of high-ash lubricating oil. The present invention adopts calcium-magnesium compound sulfonate technology to improve acid neutralization ability and corrosion resistance, and can reduce lead corrosion caused by lubricating oil oxidation; and through the combination of the above-mentioned antioxidant, anti-wear and anti-corrosion additives, antioxidants and detergent dispersants (detergents), while reducing the amount of dialkyl dithiophosphate zinc added, it still provides good antioxidant performance and can extend the oil change cycle of the oil.

[0043] Additional aspects and advantages of the present application will be given in part in the following description, and in part will become obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 Shown is a schematic diagram of a conventional medium-to-high ash motor oil with deposits on the bottom after bench testing on a methanol engine.

[0045] Figure 2 Shown are schematic diagrams of the oil-water separation state and the emulsification state of the methanol engine lubricating oil composition.

[0046] Figure 3 The graph shows the test results of the emulsification retention of the methanol engine lubricating oil composition according to the embodiment of the present invention.

[0047] Figure 4 The graph shows the test results of the methanol engine lubricating oil composition according to the embodiment of the present invention being evaluated using a Kubota small experimental engine.

[0048] Figure 5 The figure shows the test results of the methanol engine lubricating oil composition according to the embodiment of the present invention in the Mack T-13 verification.

[0049] Figure 6 The figure shows the test results of the methanol engine lubricating oil composition according to the embodiment of the present invention in the Volvo T-13 test bench. DETAILED DESCRIPTION

[0050] The present application is further described below in conjunction with specific embodiments. It should be understood that these embodiments of the present application are only used to illustrate the present application and are not used to limit the scope of the present application.

[0051] The endpoints and any values ​​of the ranges disclosed in this article are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range or the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed in this article.

[0052] If there is no special description, all embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution. If there is no special description, all technical features and optional technical features of the present application can be combined with each other to form a new technical solution.

[0053] If there is no special explanation, the "include" and "comprising" mentioned in this application are open-ended or closed-ended. For example, the "include" and "comprising" may mean that other components not listed may also be included or only the listed components may be included or only the listed components may be included.

[0054] In this article, unless otherwise specified, the percentages, ratios or parts involved are based on mass. Among them, "mass parts" refers to the basic unit of measurement of the mass ratio relationship of multiple components, and 1 part can represent any unit mass. In this article, unless otherwise specified, percentages (%) refer to the mass percentage relative to the composition.

[0055] The technical solution of this application is completed by the inventor based on the following findings: the existing methanol engine lubricating oil still has certain shortcomings, and the performance of the methanol engine lubricating oil needs to be improved, such as ash content, wear resistance, corrosion resistance and acid neutralization ability, oil emulsification or long oil change cycle. Therefore, the inventor of the present invention has developed a heavy-duty methanol engine lubricating oil based on the results of multiple actual tests and combined with the situation of traditional lubricating oil, which is conducive to alleviating these problems. Specifically, the shortcomings of the existing methanol engine lubricating oil include:

[0056] (1) In a methanol engine, methanol and lubricating oil (engine oil) are completely immiscible. When methanol is sprayed into the cylinder, it easily forms an emulsion with the oil film on the cylinder wall and burns, resulting in the accumulation of deposits and the generation of more carbon deposits. Therefore, the lubricating oil of a methanol engine needs to have an appropriate sulfate ash content to prevent the engine from having pre-ignition and knocking problems caused by excessive deposits, thereby improving safety.

[0057] (2) Methanol fuel itself is an organic solvent. It not only does not form a lubricating oil film like diesel, but is more likely to destroy the oil film, causing the methanol engine to wear more severely. At the same time, the combustion byproduct formic acid will aggravate metal corrosion. Therefore, it is necessary to improve the anti-wear, anti-corrosion and acid neutralization capabilities of methanol engine lubricants.

[0058] (3) The water content formed after combustion in a methanol engine is relatively high. The water absorption of methanol causes the lubricating oil in the crankcase to be in a mixed state of "methanol + water + engine oil". Therefore, it is necessary to solve the emulsification problem of the methanol engine lubricating oil.

[0059] (4) There is a large amount of water and acidic gas in the crankcase of the methanol engine for a long time, which will cause corrosion inside the engine. Therefore, it is necessary to solve the corrosion prevention problem of the methanol engine lubricating oil.

[0060] (5) In addition, due to the above-mentioned problems, even if a higher grade and better diesel engine oil or gas engine oil is used, the oil change cycle cannot be extended, which increases the operating cost of the vehicle. Therefore, extending the oil change cycle is also a problem that the present invention needs to solve.

[0061] In view of this, in order to alleviate at least one of the above problems of methanol engine lubricating oil, the present invention optimizes the formula of methanol engine lubricating oil, and under the joint action of multiple components in a unique combination, at least meets the requirements of improving the anti-wear, anti-corrosion and acid neutralization capabilities of methanol engine lubricating oil, reducing ash content, and extending the oil change cycle, giving methanol engine lubricating oil good comprehensive performance. The present application is described in detail below.

[0062] Unless otherwise specified, the raw materials used in the following examples and comparative examples of this application were obtained from commercial sources.

[0063] In some embodiments, a methanol engine lubricating oil composition is provided. Based on the mass of the methanol engine lubricating oil composition, the methanol engine lubricating oil composition mainly comprises the following components:

[0064] 80% to 98% of lubricating oil base oil, 0.7% to 1.2% of calcium sulfonate, 0.3% to 0.5% of magnesium sulfonate, 0.5% to 0.8% of antioxidant, anti-wear and anti-corrosion additives and 6.0% to 8.0% of antioxidant.

[0065] That is, the methanol engine lubricating oil composition of the present invention mainly comprises the following components in percentage by mass of the lubricating oil composition:

[0066] Calcium sulfonate 0.7wt%-1.2wt%, magnesium sulfonate 0.3wt%-0.5wt%, antioxidant, anti-wear and anti-corrosion additives 0.5wt%-0.8wt%, antioxidant 6.0wt%-8.0wt%, and a major amount of lubricating base oil, the content of which can be 80wt%-98wt%, for example.

[0067] The antioxidant, anti-wear and anti-corrosion additive includes zinc dialkyl dithiophosphate; the antioxidant includes at least two of ester compounds, phenol compounds or amine compounds. Preferably, the antioxidant is a composite of multiple antioxidants, and the antioxidant includes at least three of ester compounds, phenol compounds or amine compounds.

[0068] In the above-mentioned methanol engine lubricating oil composition, calcium sulfonate and magnesium sulfonate can be used as components of detergent dispersants (detergents). Therefore, the present invention can be further compounded with other additives by selecting a specific combination of detergent dispersants, antioxidant, anti-wear and anti-corrosion additives and antioxidants, and can be used to prepare a methanol engine lubricating oil composition. That is, the inventors of the present application found in their research that by adjusting the types and ratios of each raw material component, synergizing with other components, and making each component within the above-mentioned content range, the prepared methanol engine lubricating oil composition can have good wear resistance, corrosion resistance and acid neutralization capabilities, and a low ash content, which is beneficial to improving the safety of the engine, and a long oil change cycle, which is beneficial to cost savings. Compared with existing methanol engine lubricating oils, the present invention can reduce the amount of some additives while still being able to exhibit good anti-wear, antioxidant and detergency properties. Specifically:

[0069] For the above technical problem (1), that is, the problem of deposit accumulation and accelerated wear, the present application adopts a low-ash engine oil solution, which reduces the deposits in the cylinder by using a certain amount of ash-free additives, thereby reducing the cylinder wear and engine pre-ignition and knock caused by the deposit problem, thereby improving safety. Figure 1 As shown, the inventors of the present application found in the study that after the bench test of the conventional medium-high ash lubricating oil on the methanol engine, the top of the engine piston and the valve base had obvious deposits with hard texture. The analysis results of the deposits showed that carbon oxygen and other elements were the main components of the deposits, which were mainly formed by organic matter in the lubricating oil (lubricating oil rising) or methanol fuel coking on the piston surface at high temperature. This part needs to be improved by engine hardware (such as the matching of piston and cylinder liner) or the combustion method of methanol fuel. Phosphorus, zinc, calcium, magnesium, boron and molybdenum are secondary components, which come from the lubricating oil and are formed after the lubricating oil rises to the combustion chamber; this part can reduce the deposits by reducing the ash content of the lubricating oil. In addition, the chemical composition analysis of the top of the piston showed that the XRD (X-ray diffraction) analysis of the deposit phase (crystalline component) was mainly calcium phosphate and sulfate, which was mainly formed after the lubricating oil rose to the combustion chamber. Other metal elements such as magnesium and zinc did not form crystals, so they were not detected in XRD.

[0070] In view of this, the present invention adopts a method of reducing the ash content of lubricating oil, such as reducing the amount of calcium sulfonate, reducing the ash content of traditional diesel engine oil from 1.0% to 1.5% to 0.5% to 0.7%, which can effectively alleviate the negative impact of hard sediments and avoid or reduce the pre-ignition and knock problems of the engine caused by more sediments. In addition, the main component of petroleum calcium sulfonate as a detergent dispersant is reduced, and the detergent dispersibility is compensated by petroleum magnesium sulfonate, thereby ensuring the detergent property of the lubricating oil. Therefore, by making the lubricating oil composition contain 0.7% to 1.2% of calcium sulfonate, 0.3% to 0.5% of magnesium sulfonate and 0.5% to 0.8% of antioxidant, anti-wear and anti-corrosion additives (zinc dialkyl dithiophosphate), the ash content can be reduced, the detergent property can be ensured, and the above-mentioned technical problem (1) can be effectively alleviated.

[0071] Regarding the above technical problem (2), the acidity generated by combustion exacerbates the problem of corrosion and wear. That is, methanol itself, as an organic solvent, can clean carbon deposits, but at the same time, it will cause the effective ingredients in the additives to dissolve in methanol, affecting boundary lubrication. At the same time, the combustion byproduct formic acid will aggravate metal corrosion, and the problems of corrosion resistance and acid neutralization performance need to be solved. The present invention adopts calcium-magnesium compound sulfonate technology to improve the wear resistance, corrosion resistance and acid neutralization capabilities of lubricating oil. Figure 4 As shown, the inventors of the present application used a small experimental engine provided by Kubota to evaluate the acid neutralization ability and corrosion resistance of the lubricating oil. The experimental verification showed that, in terms of the comprehensive acid capacity of pure calcium sulfonate and magnesium sulfonate, the TBN (base number) / TAN (acid number) crossover time of magnesium sulfonate was more than twice that of calcium sulfonate, which can extend the service life of the oil. Figure 4 In the figure, Kubota represents Kubota, and the ordinate is the acid-base crossover time. Therefore, the present invention adopts two compounding technologies (calcium-magnesium compounded sulfonate) to improve the acid neutralization ability, and combined with zinc dialkyl dithiophosphate, it is also beneficial to improve the anti-wear and anti-corrosion ability of the lubricating oil. In addition, Figure 5 As shown, the present invention performs a Mack T-13 test, which is an engine bench test for evaluating the oxidation performance characteristics of engine oils; in addition, this test method is generally referred to as VOLVO T-13; Figure 5 The ordinate is the lead content and the abscissa is the test time. The results show that the calcium-magnesium compounding technology of the present invention can reduce lead corrosion caused by lubricating oil oxidation through Mack T-13 verification. Thus, the present invention can improve the acid neutralization ability, wear resistance and corrosion resistance of lubricating oil.

[0072] In a preferred embodiment of the present invention, for the above-mentioned technical problems (3) and (4), the present invention adds a specific co-emulsifier to alleviate the emulsification problem caused by the high water content formed after the combustion of the methanol engine, so that the engine lubricating oil is always kept in an emulsified state; a specific rust inhibitor is also added to alleviate the rust problem caused by moisture and acidity in the crankcase, thereby enhancing the anti-rust protection effect of the lubricating oil.

[0073] Regarding the above technical problem (5), that is, due to the existence of some of the above problems, the use of ordinary lubricating oil cannot achieve a long oil change cycle. In order to meet the demand for long-term oil change, the present invention adopts a compounding method of multiple antioxidants, wherein the antioxidants include at least two of ester compounds, phenolic compounds or amine compounds, preferably at least three, and are combined with a detergent dispersant combination. That is, by optimizing the antioxidant / detergent combination system, while reducing the amount of antioxidant, anti-wear and anti-corrosion additives (zinc dialkyl dithiophosphate) added, good antioxidant performance is provided, such as the performance provided is still >50% better than the specification limit. Compared with the existing oil products, the oil change cycle can only reach 20,000-30,000 kilometers, which increases the operating cost of the vehicle. The lubricating oil of the present invention can effectively extend the oil change cycle and reduce costs.

[0074] For example, the present invention adopts a combination of different types of antioxidants, using alkylphenol, long-chain alkylarylamine (amine or aromatic amine), 3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate, polyisobutylene succinimide and detergent dispersant. The antioxidant system of the present invention ensures that its performance in the Volvo T-13 bench (this method is used to evaluate the oxidation performance characteristics of diesel engine oil in engines equipped with exhaust gas recirculation and running on ultra-low sulfur diesel fuel) is better than API CJ-4 oil. Through the optimized antioxidant / detergent combination, the performance provided is still >50% better than the specification limit when the amount of ZDDP added is reduced.

[0075] The following are preferred technical solutions of the present invention, but are not intended to limit the technical solutions provided by the present invention. Through the following preferred technical solutions, the technical objectives and beneficial effects of the present invention can be better achieved and realized.

[0076] In some embodiments, based on the mass of the methanol engine lubricating oil composition, the methanol engine lubricating oil composition includes the following components:

[0077] 80% to 98% of lubricating oil base oil, 0.78% to 1.04% of calcium sulfonate, 0.325% to 0.390% of magnesium sulfonate, 0.52% to 0.65% of antioxidant, anti-wear and anti-corrosion additives and 6.375% to 7.275% of antioxidant.

[0078] By rationally adjusting and optimizing the content of each component in the methanol engine lubricating oil composition, the synergistic effect of each component can be fully utilized to further improve the anti-oxidation, anti-wear, anti-corrosion, acid neutralization ability or comprehensive performance of the methanol engine lubricating oil composition, while reducing the production cost of the lubricating oil composition.

[0079] In some embodiments, based on the mass of the methanol engine lubricating oil composition, the methanol engine lubricating oil composition further comprises the following components:

[0080] 0.2% to 0.5% of co-emulsifier and 0.15% to 0.2% of rust inhibitor.

[0081] As an example, in some embodiments, based on the mass of the methanol engine lubricating oil composition, the methanol engine lubricating oil composition includes the following components:

[0082] 80% to 98% of lubricating oil base oil, 0.7% to 1.2% of calcium sulfonate, 0.3% to 0.5% of magnesium sulfonate, 0.5% to 0.8% of antioxidant, anti-wear and anti-corrosion additives, 6.0% to 8.0% of antioxidant, 0.2% to 0.5% of emulsifier and 0.15% to 0.2% of rust inhibitor.

[0083] Preferably, based on the mass of the methanol engine lubricating oil composition, the methanol engine lubricating oil composition comprises the following components:

[0084] 80% to 98% of lubricating oil base oil, 0.78% to 1.04% of calcium sulfonate, 0.325% to 0.390% of magnesium sulfonate, 0.52% to 0.65% of antioxidant, anti-wear and anti-corrosion additives, 6.375% to 7.275% of antioxidant, 0.2% to 0.5% of emulsifier and 0.15% to 0.2% of rust inhibitor.

[0085] For the above technical problem (3), i.e., the emulsification problem caused by the high water content formed after the combustion of methanol engine, the present invention adopts a unique additive technology, i.e., a unique co-emulsifier is added to keep the oil and water in an emulsified state, and when the engine oil temperature rises, the water evaporates directly from the engine oil. Figure 2 As shown, due to the water absorption of methanol, the lubricating oil in the crankcase may be in a mixed state of "methanol + water + engine oil". After the engine stops working, the oil and water will be separated. The lower layer of water will cause crystallization in winter, making cold start difficult and affecting lubrication. Therefore, it is necessary to solve the problem of maintaining the emulsified state of lubricating oil and water. In view of this, the present invention adds 0.2% to 0.5% of an emulsifier (such as VISCOPLEX 6-850) to keep the engine oil in an emulsified state. Figure 3 As shown, Figure 3The lubricating oil in the upper part of the tank is unstable, and oil-water separation occurs; Figure 3 The lubricating oil in the lower part has good emulsification performance, and no oil-water separation phenomenon occurs; therefore, the test proves that the emulsification retention of the methanol engine lubricating oil composition of the present invention is excellent at different temperatures after 24 hours, and there is no stratification phenomenon; further, the size of the water droplets in the emulsion is maintained in a very small particle size range, thereby improving the emulsification retention performance of the engine oil.

[0086] For the above technical problem (4), that is, the rust problem caused by moisture and acidity in the crankcase, the present invention adopts the technology of adding anti-corrosion and anti-rust additives to increase the anti-corrosion protection of the engine oil. Since the methanol engine is characterized by a high concentration of acidic gas and water vapor in the crankcase, which easily causes the various metal parts in the crankcase to rust, it is necessary to improve and solve the problem of internal rust in the engine. In view of this, the present invention adds 0.15% to 0.2% of rust inhibitor (such as Irgamet30) to improve the rust problem inside the engine and improve the rust resistance of the lubricating oil.

[0087] In some embodiments, the methanol engine lubricating oil composition may also contain at least one of a pour point depressant, a thickener, a wear reducer and an antifoaming agent. Preferably, the methanol engine lubricating oil composition also contains a pour point depressant, a thickener, a wear reducer and an antifoaming agent. There is no special requirement for the content of the pour point depressant, the thickener, the wear reducer and the antifoaming agent, which can be the conventional content in the art, or the amount of the pour point depressant, the thickener, the wear reducer and the antifoaming agent can be suitably reduced.

[0088] As an example, in some embodiments, based on the mass of the methanol engine lubricating oil composition, the methanol engine lubricating oil composition further includes the following components:

[0089] 0.1% to 0.5% of pour point depressant, 0.3% to 0.7% of thickener, 0.02% to 0.08% of friction reducer and 0.003% to 0.007% of anti-foaming agent.

[0090] In other words, based on the total mass of the methanol engine lubricating oil composition as 100%, the methanol engine lubricating oil composition comprises:

[0091] 80% to 98% of lubricating oil base oil, 0.7% to 1.2% of calcium sulfonate, 0.3% to 0.5% of magnesium sulfonate, 0.5% to 0.8% of antioxidant, anti-wear and anti-corrosion additives, 6.0% to 8.0% of antioxidant, 0.2% to 0.5% of co-emulsifier, 0.15% to 0.2% of rust inhibitor, 0.1% to 0.5% of pour point depressant, 0.3% to 0.7% of thickener, 0.02% to 0.08% of wear reducer and 0.003% to 0.007% of anti-foaming agent, and the sum of the mass percentages of each component is 100%.

[0092] Preferably, based on the total mass of the methanol engine lubricating oil composition as 100%, the methanol engine lubricating oil composition comprises:

[0093] 80% to 98% of lubricating oil base oil, 0.78% to 1.04% of calcium sulfonate, 0.325% to 0.390% of magnesium sulfonate, 0.52% to 0.65% of antioxidant, anti-wear and anti-corrosion additives, 6.375% to 7.275% of antioxidant, 0.2% to 0.5% of co-emulsifier, 0.15% to 0.2% of rust inhibitor, 0.1% to 0.5% of pour point depressant, 0.3% to 0.7% of thickener, 0.039% to 0.065% of wear reducer and 0.0045% to 0.0055% of anti-foaming agent, and the sum of the mass percentages of the various components is 100%.

[0094] In some embodiments, based on the total mass of the methanol engine lubricating oil composition, the mass percentage of the lubricating oil base oil is 80% to 98%, for example, 80%, 82%, 84%, 85%, 86%, 88%, 90%, 92%, 94%, 95%, 96%, 98% and any value in the range formed by any two of these point values.

[0095] The present invention does not particularly limit the specific type of lubricating oil base oil, and conventional base oils in the art may be used.

[0096] In some embodiments, the lubricating oil base oil is selected from mineral base oil and / or synthetic base oil. Mineral base oil includes liquid paraffin oil and hydrorefined mineral lubricating oil, which are generally divided into Class I, II and III base oils. Synthetic lubricating oil includes polymerized hydrocarbon oil, alkylbenzene and its derivatives, ester oil, Fischer-Tropsch synthetic hydrocarbon oil, etc.

[0097] In the present application, the lubricating oil base oil is selected from a hydrorefined base oil, and preferably two hydrorefined base oils are compounded.

[0098] In some embodiments, the lubricating oil base oil includes a first hydrofinished base oil and a second hydrofinished base oil in a mass ratio of (70-80):(10-18).

[0099] As an example, based on the mass of the methanol engine lubricating oil composition, the methanol engine lubricating oil composition includes: 70% to 80% of the first hydrorefined base oil, and 10% to 18% of the second hydrorefined base oil.

[0100] In some embodiments, based on the total mass of the methanol engine lubricating oil composition, the mass percentage of the first hydrorefined base oil is 70% to 80%, for example, 70%, 82%, 74%, 85%, 76%, 78%, 80% and any value in the range formed by any two of these point values.

[0101] In some embodiments, based on the total mass of the methanol engine lubricating oil composition, the mass percentage of the second hydrorefined base oil is 10% to 18%, for example, 10%, 11%, 12%, 14%, 15%, 16%, 17%, 18% and any value in the range formed by any two of these point values.

[0102] In some embodiments, the first hydrorefined base oil can be, for example, Yubase 6 produced by SK Corporation of South Korea; the second hydrorefined base oil can be Yubase 4 produced by SK Corporation of South Korea. The present invention does not limit the source thereof, and it can be sold by a seller designated by SK Corporation of South Korea; the present invention does not limit the purity thereof, and it can be any purity known to those skilled in the art.

[0103] Alternatively, in some embodiments, the first hydrorefined base oil may be, for example, the base oil S-OIL6 produced by Ssangyong Company of South Korea, or the base oil CTL6 produced by Lu'an Chemical Group; the second hydrorefined base oil may be the base oil S-OIL4 produced by Ssangyong Company of South Korea, or the base oil CTL4 produced by Lu'an Chemical Group. The present invention does not limit its source, and it can be sold by Ssangyong Company of South Korea, Lu'an Company or designated sellers; the present invention does not limit its purity, and it can be well known to those skilled in the art.

[0104] Therefore, the present invention can achieve a balance between the high temperature performance and the low temperature performance of the methanol engine lubricating oil composition by using the first hydrorefined base oil and the second hydrorefined base oil in combination.

[0105] The above-mentioned calcium sulfonate and magnesium sulfonate can be used as detergent dispersants. The addition of metal detergent can neutralize the acidic substances generated by the oxidation degradation of the engine oil during use, thereby preventing it from corroding the engine. At the same time, due to the emulsification effect of the detergent soap salt on harmful particles, the purpose of slowing down the deterioration of oil and extending the service life can be achieved.

[0106] In some embodiments, based on the total mass of the methanol engine lubricating oil composition, the mass percentage of calcium sulfonate is 0.7% to 1.2%, preferably 0.78% to 1.04%, for example 0.7%, 0.72%, 0.75%, 0.78%, 0.8%, 0.85%, 0.9%, 0.95%, 1.0%, 1.04%, 1.1%, 1.2% and any value in the range formed by any two of these point values.

[0107] In some embodiments, based on the total mass of the methanol engine lubricating oil composition, the mass percentage of magnesium sulfonate is 0.3% to 0.5%, preferably 0.325% to 0.390%, for example 0.3%, 0.32%, 0.325%, 0.33%, 0.34%, 0.35%, 0.38%, 0.39%, 0.40%, 0.42%, 0.45%, 0.5% and any value in the range formed by any two of these point values.

[0108] In the present application, calcium sulfonate or magnesium sulfonate may be a sulfonate with a high basicity, for example, the sulfonate preferably has a basicity of 100 to 450 mgKOH / g.

[0109] Optionally, the alkalinity of calcium sulfonate is 300-400 mgKOH / g. Optionally, calcium sulfonate can be T106.

[0110] Optionally, the base value of the magnesium sulfonate is 300-400 mgKOH / g. Optionally, the magnesium sulfonate can be T107.

[0111] Thus, by compounding the above calcium sulfonate and magnesium sulfonate, the acid neutralization ability of the lubricating oil can be improved while the lubricating oil has good detergency and corrosion resistance.

[0112] At the same time, the present invention reduces the ash content by reducing the composition of metal salts, and uses magnesium sulfonate additives and antioxidants with good cleaning and dispersibility to compensate for the impact of reduced alkalinity caused by reduced metal salts.

[0113] It should be noted that the present invention does not limit the sources of calcium sulfonate and magnesium sulfonate, which can be commercially available; the present invention does not limit their purity, which can be known to those skilled in the art.

[0114] In some embodiments, based on the total mass of the methanol engine lubricating oil composition, the mass percentage of the antioxidant, anti-wear and anti-corrosion additives is 0.5% to 0.8%, preferably 0.52% to 0.65%, for example 0.5%, 0.52%, 0.55%, 0.58%, 0.6%, 0.62%, 0.65%, 0.7%, 0.8% and any value in the range formed by any two of these point values.

[0115] In the present application, the antioxidant, anti-wear and anti-corrosion additive is selected from zinc dialkyl dithiophosphate (ZDDP). Zinc dialkyl dithiophosphate (ZDDP) antioxidants have excellent antioxidant, anti-wear and anti-corrosion properties. Their properties are affected to a certain extent by the structure of the alkyl group. By optimizing the alkyl structure, the friction and wear resistance and corrosion resistance of the lubricating oil can be improved, while providing excellent antioxidant properties.

[0116] Generally, in conventional lubricating oils, the amount of ZDDP added is 1% to 1.2%, while the present invention reduces its content to about 0.52% to 0.65%. In addition, the present invention provides good antioxidant performance while reducing the amount of ZDDP (ZDDP is prone to hydrolysis in the presence of water) added by adopting an optimized antioxidant / detergent combination system, thereby facilitating the extension of the oil change cycle.

[0117] In some embodiments, the zinc dialkyl dithiophosphate includes at least one of thiophosphate butyl octyl primary alkyl zinc salt, thiophosphate bis octyl primary alkyl zinc salt or thiophosphate propyl octyl zinc salt. Preferably, the zinc dialkyl dithiophosphate is selected from thiophosphate butyl octyl primary alkyl zinc salt T202. The present invention does not limit the source of ZDDP, which can be commercially available; the present invention does not limit its purity, which can be known to those skilled in the art.

[0118] In some embodiments, based on the total mass of the methanol engine lubricating oil composition, the mass percentage of the antioxidant is 6.0% to 8.0%, preferably 6.375% to 7.275%, for example 6.0%, 6.3%, 6.375%, 6.5%, 6.8%, 7.0%, 7.275%, 7.5%, 8.0% and any value in the range formed by any two of these point values.

[0119] In the present application, the antioxidant includes at least two, preferably at least three, of ester compounds, phenol compounds or amine compounds.

[0120] The combined use of the above-mentioned antioxidants has an important impact on the antioxidant and stability of oil products, can effectively inhibit the viscosity growth of oil products, extend service life, and reduce the generation of acidic substances leading to corrosion; in addition, when multiple antioxidants are used in combination, their dosage ratio needs to be controlled within an appropriate range.

[0121] In some embodiments, the antioxidant includes a first antioxidant, a second antioxidant, a third antioxidant and a fourth antioxidant, the first antioxidant is selected from phenolic antioxidants, the second antioxidant is selected from hindered phenolic antioxidants and / or aromatic amine antioxidants, the third antioxidant is selected from ester antioxidants, and the fourth antioxidant is selected from amine antioxidants.

[0122] In some embodiments, the mass ratio of the first antioxidant, the second antioxidant, the third antioxidant and the fourth antioxidant is (2.8-3.2): (1.0-1.5): (0.01-0.08): (2.2-2.7).

[0123] Preferably, the mass ratio of the first antioxidant, the second antioxidant, the third antioxidant and the fourth antioxidant is (2.89-3.17): (1.13-1.43): (0.015-0.075): (2.34-2.6).

[0124] As an example, based on the mass of the methanol engine lubricating oil composition, the methanol engine lubricating oil composition includes: 2.8% to 3.2% of the first antioxidant, 1.0% to 1.5% of the second antioxidant, 0.01% to 0.08% of the third antioxidant and 2.2% to 2.7% of the fourth antioxidant.

[0125] Preferably, based on the mass of the methanol engine lubricating oil composition, the methanol engine lubricating oil composition includes: 2.89% to 3.17% of the first antioxidant, 1.13% to 1.436% of the second antioxidant, 0.015% to 0.075% of the third antioxidant and 2.34% to 2.6% of the fourth antioxidant.

[0126] Optionally, the first antioxidant is selected from antioxidant THANOX L57 (such as from Lianlong). The present invention does not limit the source of the first antioxidant, which can be commercially available; the present invention does not limit its purity, which can meet the technical quality indicators of the product or be well known to those skilled in the art.

[0127] Optionally, the second antioxidant is selected from antioxidant THANOX L135R (such as from Lianlong). The present invention does not limit the source of the first antioxidant, which can be commercially available; the present invention does not limit its purity, which can meet the technical quality indicators of the product or be well known to those skilled in the art.

[0128] Optionally, the third antioxidant is selected from methyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate. The present invention does not limit its source, and it can be commercially available; the present invention does not limit its purity, and it can be known to those skilled in the art.

[0129] Optionally, the fourth antioxidant is selected from polyisobutylene succinimide, specifically T154. The present invention does not limit its source, which can be commercially available; the present invention does not limit its purity, which can be known to those skilled in the art.

[0130] In this way, by using the compound of the first antioxidant, the second antioxidant, the third antioxidant and the fourth antioxidant, the anti-oxidation performance of the lubricating oil is improved, which is conducive to extending the oil change cycle.

[0131] In some embodiments, based on the total mass of the methanol engine lubricating oil composition, the mass percentage of the co-emulsifier is 0.2% to 0.5%, for example, 0.2%, 0.3%, 0.4%, 0.5% and any value in the range formed by any two of these point values.

[0132] In some embodiments, the co-emulsifier is selected from VISCOPLEX 6-850 (Evonik). The present invention does not limit its source, and it can be supplied by a seller designated by Evonik; the present invention does not limit its purity, and it can meet the technical quality indicators of the product.

[0133] The above-mentioned emulsifier has a good emulsification effect, can keep the engine oil in an emulsified state all the time, and improves the emulsification retention performance of the engine oil.

[0134] In some embodiments, based on the total mass of the methanol engine lubricating oil composition, the mass percentage of the rust inhibitor is 0.15% to 0.2%, for example, 0.15%, 0.16%, 0.18%, 0.2% and any value in the range formed by any two of these point values.

[0135] In some embodiments, the rust inhibitor is selected from Irgamet 30 (BASF). The present invention does not limit its source, and it can be sold by a seller designated by BASF; the present invention does not limit its purity, and it can be known to those skilled in the art.

[0136] The invention can improve the rust problem inside the engine by adding BASF's rust inhibitor Irgamet 30 in a proportion of 0.15-0.2%.

[0137] In some embodiments, based on the total mass of the methanol engine lubricating oil composition, the mass percentage of the pour point depressant is 0.1% to 0.5%, for example, 0.1%, 0.2%, 0.3%, 0.4%, 0.5% and any value in the range formed by any two of these point values.

[0138] In some embodiments, the pour point depressant is selected from VISCOPLEX 1-248 (Evonik). The present invention does not limit its source, and it can be supplied by a seller designated by Evonik; the present invention does not limit its purity, and it can meet the technical quality indicators of the product.

[0139] In some embodiments, based on the total mass of the methanol engine lubricating oil composition, the mass percentage of the thickener is 0.3% to 0.7%, for example, 0.3%, 0.4%, 0.5%, 0.6%, 0.7% and any value in the range formed by any two of these point values.

[0140] In some embodiments, the thickener is selected from SV203, ie, Infineum SV203 (from Infineum).

[0141] In some embodiments, based on the total mass of the methanol engine lubricating oil composition, the mass percentage of the wear reducer is 0.02% to 0.08%, preferably 0.039% to 0.065%, for example 0.02%, 0.03%, 0.039%, 0.04%, 0.05%, 0.06%, 0.07%, 0.08% and any value in the range formed by any two of these point values.

[0142] In some embodiments, the friction reducing agent is selected from molybdenum dialkyl dithiophosphates.

[0143] The above-mentioned dialkyl molybdenum dithiophosphate is used as a lubricant additive, and has multiple functions such as anti-wear, friction reduction, and extreme pressure friction resistance, and has a certain synergistic effect when used in combination with an antioxidant.

[0144] In some embodiments, based on the total mass of the methanol engine lubricating oil composition, the mass percentage of the anti-foaming agent is 0.003% to 0.007%, preferably 0.0045% to 0.0055%, for example 0.003%, 0.004%, 0.0045%, 0.005%, 0.0055%, 0.006%, 0.007% and any value in the range formed by any two of these point values.

[0145] In some embodiments, the anti-foaming agent comprises a non-silicon anti-foaming agent. Optionally, the anti-foaming agent is selected from non-silicon Foamban 155 (such as from Mengqingxin).

[0146] Therefore, based on the above settings, the lubricating oil provided by the present invention is suitable for the characteristics of methanol engines. It uses the formula ratio adjustment of the composite additive to improve the anti-oxidation and anti-corrosion, dispersion and cleaning, and emulsification retention capabilities of the methanol engine, thereby increasing the quality of the lubricating oil and the oil change cycle.

[0147] The invention adopts low-ash lubricant additive combination technology to achieve the effect comparable to that of high-ash lubricant. The lubricant provided by the invention has good emulsification retention with water. The lubricant provided by the invention has excellent anti-corrosion ability.

[0148] In some embodiments, the present application provides a method for preparing a methanol engine lubricating oil composition, the method comprising:

[0149] Add lubricating base oil into a container and perform a first heating and stirring;

[0150] Calcium sulfonate, magnesium sulfonate, antioxidant, anti-wear and anti-corrosion additives and an antioxidant are added into a container to obtain a mixture, and the mixture is subjected to a second heating and stirring, wherein the antioxidant, anti-wear and anti-corrosion additive includes zinc dialkyl dithiophosphate, and the antioxidant includes at least two of ester compounds, phenolic compounds or amine compounds, to obtain a methanol engine lubricating oil composition.

[0151] It should be understood that the “method for preparing a methanol engine lubricant oil composition” and the aforementioned “methanol engine lubricant oil composition” are based on the same inventive concept, and all the features and advantages described above for the “methanol engine lubricant oil composition” are also applicable to the “method for preparing a methanol engine lubricant oil composition” and will not be described one by one here.

[0152] In some embodiments, the mixture further includes an emulsifier, a rust inhibitor, a pour point depressant, a thickener, and a friction reducer.

[0153] In some embodiments, after the second heating and stirring, the method further comprises: adding an anti-foaming agent to the mixture, and then continuing to stir.

[0154] Exemplarily, the method for preparing the methanol engine lubricating oil composition comprises:

[0155] Add lubricating base oil into the container, turn on the stirrer, and perform first heating and stirring;

[0156] Adding calcium sulfonate, magnesium sulfonate, antioxidant, anti-wear and anti-corrosion additives, antioxidant, co-emulsifier, rust inhibitor, pour point depressant, thickener and friction reducer into a container to obtain a mixture, raising the temperature, and performing a second heating and stirring on the mixture;

[0157] Then, add the antifoaming agent through the disperser and continue stirring.

[0158] In some embodiments, the heating temperature of the first heating and stirring is 40° C. to 60° C., the stirring speed is 200 to 400 r / min, and the stirring time is 45 min to 70 min.

[0159] In some embodiments, the heating temperature of the second heating and stirring is 50° C. to 65° C., the stirring speed is 200 to 400 r / min, and the stirring time is 1 h to 2 h.

[0160] In some embodiments, the stirring speed is 200-400 r / min, and the stirring time is 10-20 min.

[0161] Hereinafter, the embodiments of the present application will be described. The embodiments described below are exemplary and are only used to explain the present application, and should not be construed as limiting the present application. If no specific technology or conditions are specified in the embodiments, the technology or conditions described in the literature in this area or the product instructions are used. If the manufacturer of the reagents, materials or instruments used is not specified, they are all conventional products that can be obtained commercially.

[0162] Example 1

[0163] A methanol engine lubricating oil composition comprises the following components in percentage by weight:

[0164] First hydrorefined base oil Yubase 6: 75%;

[0165] Second hydrorefined base oil Yubase 4: 14.915%;

[0166] Calcium sulfonate T106: 0.91%;

[0167] Magnesium sulfonate T107: 0.35%;

[0168] Antioxidant, antiwear and anticorrosion additives: 1,2-dimethoxy-1,2-dioxo ...

[0169] First antioxidant THANOX L57: 3%

[0170] Second antioxidant THANOX L135R: 1.28%

[0171] The third antioxidant 3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionic acid methyl ester: 0.045%;

[0172] The fourth antioxidant polyisobutylene succinimide T154: 2.5%;

[0173] Co-emulsifier VISCOPLEX 6-850: 0.4%;

[0174] Rust inhibitor BASF Irgamet 30: 0.18%;

[0175] Pour point depressant VISCOPLEX 1-248: 0.3%;

[0176] Thickener SV203: 0.5%;

[0177] Friction reducer: dialkyl dithiophosphate molybdenum: 0.05%;

[0178] Antifoaming agent FOAM BAN 155: 50ppm.

[0179] Example 2

[0180] A methanol engine lubricating oil composition comprises the following components in percentage by weight:

[0181] The first hydrorefined base oil Lu'an produced CTL6: 79%;

[0182] The second hydrorefined base oil CTL4 produced in Lu'an: 10.815%;

[0183] Calcium sulfonate T106: 0.91%;

[0184] Magnesium sulfonate T107: 0.35%;

[0185] Antioxidant, antiwear and anticorrosion additives: 1,2-dimethoxy-1,2-dioxo ...

[0186] First antioxidant THANOX L57: 3%

[0187] Second antioxidant THANOX L135R: 1.28%

[0188] The third antioxidant 3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionic acid methyl ester: 0.045%;

[0189] The fourth antioxidant polyisobutylene succinimide T154: 2.5%;

[0190] Co-emulsifier VISCOPLEX 6-850: 0.4%;

[0191] Rust inhibitor BASF Irgamet 30: 0.18%;

[0192] Pour point depressant VISCOPLEX 1-300: 0.4%;

[0193] Thickener SV203: 0.5%;

[0194] Friction reducer: dialkyl dithiophosphate molybdenum: 0.05%;

[0195] Antifoaming agent FOAM BAN 155: 50ppm.

[0196] Example 3

[0197] A methanol engine lubricating oil composition comprises the following components in percentage by weight:

[0198] First hydrorefined base oil Yubase 6: 75%;

[0199] Second hydrorefined base oil Yubase 4: 10.415%;

[0200] Calcium sulfonate T106: 0.91%;

[0201] Magnesium sulfonate T107: 0.35%;

[0202] Antioxidant, antiwear and anticorrosion additives: 1,2-dimethoxy-1,2-dioxo ...

[0203] First antioxidant THANOX L57: 3%

[0204] Second antioxidant THANOX L135R: 1.28%

[0205] The third antioxidant is methyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate: 0.045%; the fourth antioxidant is polyisobutylene succinimide T154: 2.5%;

[0206] Co-emulsifier VISCOPLEX 6-850: 0.4%;

[0207] Rust inhibitor BASF Irgamet 30: 0.18%;

[0208] Pour point depressant VISCOPLEX 1-248: 0.3%;

[0209] Thickener VISCOPLEX 3-510: 5%;

[0210] Friction reducer: dialkyl dithiophosphate molybdenum: 0.05%;

[0211] Antifoaming agent FOAM BAN 155: 50ppm.

[0212] The rest are the same as in Example 1.

[0213] Comparative Example 1

[0214] A methanol engine lubricating oil composition comprises the following components in percentage by weight:

[0215] The first hydrorefined base oil, No. 68 base oil produced by Hengli: 29%;

[0216] The second hydrorefined base oil 150N produced by Hongrun: 52.8%;

[0217] Calcium sulfonate T106: 1.7%;

[0218] Antioxidant, antiwear and anticorrosion additives: 1,2-dimethoxy-1,2-dioxo ...

[0219] Amine antioxidant: 1.5%

[0220] Phenolic antioxidant: 1.0%

[0221] Pour point depressant VISCOPLEX 1-248: 0.4%;

[0222] Thickener LZ7077: 13%;

[0223] Antifoaming agent FOAM BAN 155: 50ppm.

[0224] Comparative Example 2

[0225] A methanol engine lubricating oil composition comprises the following components in percentage by weight:

[0226] First hydrorefined base oil 500N produced by Formosa Plastics: 24%;

[0227] The second hydrorefined base oil 150N produced by Hongrun: 56.85%;

[0228] Calcium sulfonate T106: 1.55%;

[0229] Antioxidant, antiwear and anticorrosion additives: 1,2-dimethoxy-1,2-dioxo ...

[0230] Amine antioxidant: 1.4%

[0231] Phenolic antioxidant: 1.2%

[0232] Pour point depressant VISCOPLEX 1-248: 0.3%;

[0233] Thickener LZ7077: 14%;

[0234] Antifoam agent FOAM BAN 155: 50ppm

[0235] Performance Testing

[0236] The performance of the methanol engine lubricating oil compositions prepared in the above-mentioned embodiments and comparative examples was tested. The specific test methods and test results are shown in Tables 1 and 2 below.

[0237] Table 1

[0238]

[0239]

[0240] Table 2

[0241]

[0242]

[0243] It can be seen from the data in Table 1 that, compared with Example 1, Example 2 has better low-temperature fluidity, which can be reflected from the low-temperature dynamic viscosity and boundary pumping viscosity indicators, and lower engine oil consumption, which can be reflected from the volatility indicators.

[0244] Compared with Example 1, Example 3 is not as good as Example 1 in shear stability, as reflected by the diesel nozzle shear index, but Example 3 has better energy-saving effect, as reflected by the high temperature high shear HTHS index. Reducing the viscosity of high temperature high shear at low temperature is conducive to improving the energy-saving effect, which is a data recognized by the industry. 3-510 has the same HTHS at 150°C, but has lower HTHS at 100°C and 80°C.

[0245] Further, it can be seen from Table 1 and Table 2 that, compared with Examples 1-3, the sulfate ash content of Comparative Example 1-2 is high, and pure calcium sulfonate is used as a detergent dispersant, which is easy to produce sediment in a methanol engine. In addition, the antioxidant capacity of Comparative Example 1-2 is weak, and it is not suitable for use in a methanol engine with a high engine operating temperature. In addition, Comparative Example 1-2 does not have an additive emulsifier, and after water enters, the water and oil will separate after standing for a period of time, resulting in difficulty in cold starting in winter and causing engine wear.

[0246] Parts of the present invention that are not described in detail are well known to those skilled in the art.

[0247] The basic principle of the present invention is described above in conjunction with specific embodiments. However, it should be pointed out that the advantages, strengths, effects, etc. mentioned in the present invention are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. must be possessed by each embodiment of the present invention. In addition, the specific details disclosed above are only for the purpose of illustration and facilitation of understanding, rather than limitation, and the above details do not limit the present invention to being implemented by adopting the above specific details.

[0248] It should be noted that the term "and / or" or " / " used in this document is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. The singular forms of "a", "the" and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0249] In the detailed description and claims, a list of items connected by the terms "at least one of," "at least one of," "at least one of," or other similar terms may mean any combination of the listed items. For example, if items A, B are listed, the phrase "at least one of A, B" means only A; only B; or A and B. In another example, if items A, B, C are listed, the phrase "at least one of A, B, C" means only A; or only B; only C; A and B (excluding C); A and C (excluding B); B and C (excluding A); or all of A, B, and C. Item A may include a single element or multiple elements. Item B may include a single element or multiple elements. Item C may include a single element or multiple elements.

[0250] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A methanol engine lubricating oil composition, characterized in that: Based on the mass of the methanol engine lubricating oil composition, the methanol engine lubricating oil composition includes the following components: 80% to 98% of lubricating oil base oil, 0.7% to 1.2% of calcium sulfonate, 0.3% to 0.5% of magnesium sulfonate, 0.5% to 0.8% of antioxidant, anti-wear and anti-corrosion additives and 6.0% to 8.0% of antioxidant; The anti-oxidation, anti-wear and anti-corrosion additives include zinc dialkyl dithiophosphate; The antioxidant includes at least two of ester compounds, phenol compounds or amine compounds.

2. The methanol engine lubricating oil composition according to claim 1, characterized in that: Based on the mass of the methanol engine lubricating oil composition, the methanol engine lubricating oil composition includes the following components: 80% to 98% of lubricating oil base oil, 0.78% to 1.04% of calcium sulfonate, 0.325% to 0.390% of magnesium sulfonate, 0.52% to 0.65% of antioxidant, anti-wear and anti-corrosion additives and 6.375% to 7.275% of antioxidant.

3. The methanol engine lubricating oil composition according to claim 1, characterized in that: The dialkyl zinc dithiophosphate includes at least one of butyl octyl zinc thionate, bis-octyl zinc thionate or propyl octyl zinc thionate; and / or, The antioxidants include a first antioxidant, a second antioxidant, a third antioxidant and a fourth antioxidant, wherein the first antioxidant is selected from phenolic antioxidants, the second antioxidant is selected from hindered phenolic antioxidants and / or aromatic amine antioxidants, the third antioxidant is selected from ester antioxidants, and the fourth antioxidant is selected from amine antioxidants.

4. The methanol engine lubricating oil composition according to claim 3, characterized in that: The mass ratio of the first antioxidant, the second antioxidant, the third antioxidant and the fourth antioxidant is (2.8-3.2): (1.0-1.5): (0.01-0.08): (2.2-2.7); and / or, The first antioxidant is selected from the antioxidant THANOX L57; and / or, The second antioxidant is selected from the antioxidant THANOX L135R; and / or, The third antioxidant is selected from methyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate; and / or, The fourth antioxidant is selected from polyisobutylene succinimide.

5. The methanol engine lubricating oil composition according to claim 1, characterized in that: Based on the mass of the methanol engine lubricating oil composition, the methanol engine lubricating oil composition further comprises the following components: 0.2% to 0.5% of co-emulsifier and 0.15% to 0.2% of rust inhibitor.

6. The methanol engine lubricating oil composition according to claim 5, characterized in that: The co-emulsifier comprises VISCOPLEX 6-850; and / or, The rust inhibitor includes Irgamet 30.

7. The methanol engine lubricating oil composition according to any one of claims 1 to 6, characterized in that: Based on the mass of the methanol engine lubricating oil composition, the methanol engine lubricating oil composition further comprises the following components: 0.1% to 0.5% of pour point depressant, 0.3% to 0.7% of thickener, 0.02% to 0.08% of friction reducer and 0.003% to 0.007% of anti-foaming agent.

8. The methanol engine lubricating oil composition according to claim 7, characterized in that: The pour point depressant comprises VISCOPLEX 1-248; and / or, The thickener comprises SV203; and / or, The friction reducing agent comprises dialkyl dithiophosphate molybdenum; and / or, The antifoaming agent comprises a non-silicon antifoaming agent; and / or, The lubricating oil base oil comprises a first hydrorefined base oil and a second hydrorefined base oil in a mass ratio of (70-80):(10-18).

9. A method for preparing a methanol engine lubricating oil composition, characterized in that: The method comprises: Add lubricating base oil into a container and perform a first heating and stirring; Calcium sulfonate, magnesium sulfonate, antioxidant, anti-wear and anti-corrosion additives and an antioxidant are added into a container to obtain a mixture, and the mixture is subjected to a second heating and stirring, wherein the antioxidant, anti-wear and anti-corrosion additive includes zinc dialkyl dithiophosphate, and the antioxidant includes at least two of ester compounds, phenolic compounds or amine compounds, to obtain a methanol engine lubricating oil composition.

10. The method for preparing a methanol engine lubricating oil composition according to claim 9, characterized in that: The mixture also includes an emulsifier, a rust inhibitor, a pour point depressant, a thickener and a friction reducer; After the second heating and stirring, the method further comprises: adding an antifoaming agent to the mixture, and then continuing to stir; Wherein, the heating temperature of the first heating and stirring is 40°C to 60°C, the stirring speed is 200 to 400 r / min, and the stirring time is 45 min to 70 min; and / or, The second heating and stirring process has a heating temperature of 50° C. to 65° C., a stirring speed of 200 to 400 r / min, and a stirring time of 1 to 2 hours; and / or, The stirring speed of the continued stirring is 200-400 r / min, and the stirring time is 10-20 min.

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