Low-base-number marine medium-speed engine oil complexing agent, low-base-number marine medium-speed engine oil and preparation method and application of low-base-number marine medium-speed engine oil

Abstract

The invention relates to the technical field of lubricating oil, and provides a low-base-number marine medium-speed engine oil complexing agent, low-base-number marine medium-speed engine oil and a preparation method and application of the low-base-number marine medium-speed engine oil. The low-base-number marine medium-speed engine oil complexing agent comprises a clearing agent, a dispersing agent and an antioxidant, wherein the clearing agent accounts for 50-75wt% of the mass of the complexing agent, the dispersing agent accounts for 17-37wt% of the mass of the complexing agent, and the antioxidant accounts for 8-14wt% of the mass of the complexing agent; the detergent comprises calcium alkyl salicylate and synthetic calcium sulfonate; the mass ratio of the calcium alkyl salicylate to the synthetic calcium sulfonate is 1: (0.1-1). The low-base-number medium-speed engine oil complexing agent provided by the invention can be mixed with base oil to prepare low-base-number medium-speed engine oil with adjustable base number of 12-20, has good detergency and dispersibility, oxidation and wear resistance and excellent water separation performance, and can meet the use requirements of marine medium-speed engine oil.

Description

Technical Field

[0001] The present invention relates to the technical field of lubricating oils, and more specifically, to a low-base-number marine medium-speed engine oil compound, a low-base-number marine medium-speed engine oil, a preparation method thereof, and an application thereof. Background Art

[0002] The rotational speed range of medium-speed trunk piston engines is 300 - 1000 rpm, and they can be used in fields such as marine main engines, auxiliary engines, and power plant power generation. Medium-speed engine oil is used for crankcase and cylinder lubrication, and can lubricate all the main moving parts and seals of medium-speed trunk piston diesel engines.

[0003] Marine medium-speed engine oil is circulated and used in engines. It has to cope with poor combustion conditions brought about by low-quality fuel and reduce the production of deposits on engine components. Therefore, it needs to have good detergency and dispersancy, as well as antioxidant and anti-wear properties. In addition, since ships sail at sea, it also has to cope with a working environment with high humidity and easy water ingress, and also needs to have good water separation performance.

[0004] In addition, with the full implementation of global emission regulations in 2020, in order to match the use of low-sulfur fuel, the demand for low-base-number marine medium-speed engine oil is also increasing day by day. Therefore, it is necessary to develop a low-base-number marine medium-speed engine oil compound to meet market demand.

[0005] Chinese Patent Application CN202211397131.9 discloses a medium-speed engine oil compound, a preparation method thereof, and an application thereof. The mass percentage dosage composition is: 60 - 80% metal detergent, 10 - 30% ashless dispersant, and 10 - 15% zinc dialkyldithiophosphate. The detergent includes at least one of calcium alkylsalicylate and calcium sulfonated alkylphenol. The dispersant includes at least one of high molecular weight polyisobutylene succinimide and diallyl polyisobutylene succinimide. However, there is still room for further optimization of the water separation performance of the marine medium-speed engine oil formulated by mixing this medium-speed engine oil compound with base oil. Summary of the Invention

[0006] The purpose of the present invention is to provide a low-base-number marine medium-speed engine oil compound, a low-base-number marine medium-speed engine oil, a preparation method thereof, and an application thereof, so as to solve the technical problem that the water separation performance of low-base-number marine medium-speed engine oil in the prior art needs to be further improved.

[0007] To achieve the above purpose, the technical solution adopted by the present invention is:

[0008] In a first aspect, the present invention provides a low-base marine medium-speed engine oil compound, which includes a detergent, a dispersant, and an antioxidant; wherein, the detergent accounts for 50-75 wt% of the compound by mass, the dispersant accounts for 17-37 wt% of the compound by mass, and the antioxidant accounts for 8-14 wt% of the compound by mass; the detergent includes calcium alkyl salicylate and synthetic calcium sulfonate; the mass ratio of calcium alkyl salicylate to synthetic calcium sulfonate is 1:0.1-1.

[0009] According to some embodiments of the present invention, the detergent accounts for 50-65 wt% of the compound by mass.

[0010] According to some embodiments of the present invention, the dispersant accounts for 20-37 wt% of the compound by mass.

[0011] According to some embodiments of the present invention, the antioxidant accounts for 10-14 wt% of the compound by mass.

[0012] According to some embodiments of the present invention, the mass ratio of calcium alkyl salicylate to synthetic calcium sulfonate can be 1:0.1, 1:0.2, 1:0.3, 1:0.4, 1:0.5, 1:0.6, 1:0.7, 1:0.8, 1:0.9, 1:1, etc.

[0013] According to some embodiments of the present invention, the calcium alkyl salicylate includes at least one of medium-base calcium alkyl salicylate, high-base calcium alkyl salicylate, and ultra-high-base calcium alkyl salicylate.

[0014] Among them, the base number of the medium-base calcium alkyl salicylate is not less than 160 mgKOH / g; the base number of the high-base calcium alkyl salicylate is not less than 265 mgKOH / g; the base number of the ultra-high-base calcium alkyl salicylate is not less than 295 mgKOH / g.

[0015] According to some embodiments of the present invention, the calcium alkyl salicylate includes medium-base calcium alkyl salicylate, high-base calcium alkyl salicylate, and ultra-high-base calcium alkyl salicylate.

[0016] According to some embodiments of the present invention, the mass ratio of the medium-base calcium alkyl salicylate, high-base calcium alkyl salicylate, and ultra-high-base calcium alkyl salicylate is 1:1~2:0.5~2.

[0017] According to some embodiments of the present invention, the mass ratio of the medium-base calcium alkyl salicylate, high-base calcium alkyl salicylate, and ultra-high-base calcium alkyl salicylate is 1:1.3-1.6:0.8-1.2.

[0018] According to some embodiments of the present invention, the dispersant includes at least one of high-molecular-weight succinimide and diallyl succinimide.

[0019] According to some embodiments of the present invention, the dispersant includes diallyl succinimide.

[0020] According to some embodiments of the present invention, the antioxidant includes a sulfur-phosphorus type zinc salt, preferably zinc diisooctyl dithiophosphate.

[0021] In a second aspect, the present invention provides a low-alkalinity marine medium-speed engine oil, comprising the compound agent described in the first aspect and a base oil.

[0022] 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.

[0023] According to some embodiments of the present invention, the content of the compound agent in the low-alkalinity marine medium-speed engine oil is 5-15 wt%, for example, it can be 5 wt%, 6 wt%, 7 wt%, 8 wt%, 9 wt%, 10 wt%, 11 wt%, 12 wt%, 13 wt%, 14 wt%, 15 wt%, etc.

[0024] In a third aspect, the present invention provides a preparation method of the low-alkalinity marine medium-speed engine oil described in the second aspect, comprising: mixing and stirring the compound agent and the base oil, and the low-alkalinity marine medium-speed engine oil can be obtained.

[0025] According to some embodiments of the present invention, the temperature of the mixing and stirring is 50-65 °C.

[0026] In a fourth aspect, the present invention provides an application of the low-alkalinity marine medium-speed engine oil described in the second aspect in a marine medium-speed engine.

[0027] The beneficial effects of the present invention are at least as follows:

[0028] The low-alkalinity medium-speed engine oil compound agent provided by the present invention can be mixed with a base oil to prepare a low-alkalinity medium-speed engine oil with an adjustable alkalinity of 12-20, having good detergency and dispersibility, antioxidant and anti-wear properties, and excellent water separation performance, and can meet the use requirements of marine medium-speed engine oil. Specific Embodiments

[0029] In order to make the technical problems to be solved, technical solutions and beneficial effects of the present invention clearer, the following further details the present invention in combination with specific embodiments. It should be understood that the specific embodiments described here are only used to detail this patent and do not limit the protection scope of the present invention in any way.

[0030] Unless otherwise defined, the technical terms used in the following examples have the same meanings as commonly understood by those skilled in the art to which the present invention pertains. The reagents used in the following examples are all conventional biochemical reagents unless otherwise specified; the raw materials, instruments, and equipment used in the following examples can all be obtained through market purchase or by existing methods; the dosages of the reagents are the dosages of the reagents in conventional experimental operations unless otherwise specified; the experimental methods are all conventional methods unless otherwise specified.

[0031] Prepare the medium-speed marine engine oils of each example and comparative example according to the formulation shown in Table 1.

[0032] The specific preparation method includes: stirring the mixture including each raw material component at 60 °C for 2 h until it is completely uniform to obtain the medium-speed marine engine oil.

[0033] Among them, the base number determination method refers to SH / T 0251. Potentiometric titration is carried out by using a perchloric acid - glacial acetic acid standard titration solution, and the potential jump point of the titration curve is the end point. The base number indirectly reflects the content of the detergent-dispersant in the oil product and is an important control index for marine engine oils.

[0034] Table 1

[0035]

[0036] Perform performance tests on the cylinder oil compositions of each example and comparative example. The test methods are as follows:

[0037] (1) High-temperature detergency: The crankcase simulation test method SH / T 0300 is used to measure the coke weight on the test aluminum plate surface. The smaller the coke weight, the better the high-temperature detergency performance.

[0038] (2) Oxidation resistance: The lubricating oil oxidation induction period determination method SH / T 0719 is used to measure the oxidation induction period. The longer the oxidation induction period, the better the oxidation resistance performance.

[0039] (3) Water separability: The marine oil-water separation determination method SH / T 0619 is used to measure the volume of the water layer / emulsion layer. The larger the volume of the water layer and the smaller the volume of the emulsion layer, the better the water separation performance.

[0040] The test results are shown in Table 2.

[0041] Table 2

[0042]

[0043] It can be seen from the above test results that the low-alkalinity marine medium-speed engine oil provided by the present invention has good detergency and dispersibility, antioxidant and anti-wear properties, and water separation performance by using a combination of calcium alkyl salicylate and synthetic calcium sulfonate as detergents. Among them, the low-alkalinity marine medium-speed engine oil containing calcium alkyl salicylate in the detergent including medium-alkalinity calcium alkyl salicylate, high-alkalinity calcium alkyl salicylate, and ultra-high-alkalinity calcium alkyl salicylate, and using diene-based succinimide as a dispersant has the best comprehensive performance.

[0044] It should be noted that the above-described embodiments are only used to explain the present invention and do not constitute any limitation to the present invention. The present invention has been described by referring to typical embodiments, but it should be understood that the words used therein are descriptive and explanatory words rather than limiting words. Modifications can be made to the present invention within the scope of the claims of the present invention as provided, and the present invention can 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 low base number marine medium speed engine oil compound, characterized in that: It includes a detergent, a dispersant and an antioxidant; wherein, the detergent accounts for 50-75 wt% of the mass of the compound agent, the dispersant accounts for 17-37 wt% of the mass of the compound agent, and the antioxidant accounts for 8-14 wt% of the mass of the compound agent; the detergent includes calcium alkyl salicylate and synthetic calcium sulfonate; the mass ratio of calcium alkyl salicylate to synthetic calcium sulfonate is 1:0.1-1.

2. The low-alkalinity marine medium-speed engine oil compound according to claim 1, wherein The calcium alkyl salicylate includes at least one of medium-base calcium alkyl salicylate, high-base calcium alkyl salicylate and ultra-high-base calcium alkyl salicylate; preferably, the calcium alkyl salicylate includes medium-base calcium alkyl salicylate, high-base calcium alkyl salicylate and ultra-high-base calcium alkyl salicylate.

3. The low-alkalinity marine medium-speed engine oil compound according to claim 2, characterized in that, The mass ratio of the medium-base calcium alkyl salicylate, high-base calcium alkyl salicylate and ultra-high-base calcium alkyl salicylate is 1:1-2:0.5-2.

4. The low-alkalinity marine medium-speed engine oil compound according to any one of claims 1-3, characterized in that, The dispersant includes at least one of high molecular weight succinimide and diallyl succinimide.

5. The low-alkalinity marine medium-speed engine oil compound according to any one of claims 1-4, characterized in that, The antioxidant includes a sulfur-phosphorus type zinc salt, preferably zinc diisooctyl dithiophosphate.

6. A low-base-number marine medium-speed engine oil, characterized in that, It includes the compound agent according to any one of claims 1-5 and a base oil.

7. The low-alkalinity medium-speed marine engine oil according to claim 6, characterized in that, The base oil includes at least one of Group I base oil and Group II base oil.

8. The low-alkalinity medium-speed marine engine oil according to claim 6 or 7, characterized in that, The content of the compound agent in the low-base marine medium-speed engine oil is 5-15 wt%.

9. A method for preparing a low-base marine medium-speed engine oil according to any one of claims 6-8, characterized in that, It includes: Mix and stir the compound agent and the base oil, and the low-base marine medium-speed engine oil can be obtained.

10. Application of the low-base marine medium-speed engine oil according to any one of claims 6-8 in a marine medium-speed engine.

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