High-oxidation-resistance, low-alkalinity marine cylinder oil composition, preparation method and application thereof

Abstract

The present invention relates to the technical field of lubricating oils, and provides a high-oxidation-resistance, low-base-number marine cylinder oil composition, its preparation method, and application. The high-oxidation-resistance, low-base-number marine cylinder oil composition comprises 10 to 25 parts by weight of a detergent, 0.5 to 10 parts by weight of a dispersant, 0.5 to 5 parts by weight of an antioxidant, and 70 to 85 parts by weight of a base oil; the base number of the composition is 30 to 50 mgKOH / g; the calcium content of the composition is not less than 16,000 ppm; the detergent comprises a sulfonate and a sulfurized alkyl phenol salt, and the weight ratio of the sulfonate to the sulfurized alkyl phenol salt is 5.5 to 10:1. The high-oxidation-resistance, low-base-number marine cylinder oil composition provided by the present invention has excellent high-temperature oxidation stability and is suitable for lubricating the cylinder part of a marine low-speed two-stroke crosshead diesel engine using fuel with a sulfur content of less than 0.5%.

Description

Technical Field

[0001] The present invention relates to the technical field of lubricating oils, and more particularly to a high-oxidation-resistance, low-base-number marine cylinder oil composition, a preparation method thereof, and applications thereof. Background Art

[0002] As environmental conditions become increasingly severe, the International Maritime Organization (IMO) has implemented a cap on fuel sulfur content. Effective January 1, 2020, the 0.5% international sulfur limit will take full effect. Except for vessels operating within ECA (Emission Control Areas) fuels capped at 0.1%, and vessels equipped with scrubbers, all other vessels must use fuel with a sulfur content below 0.5%. International OEMs recommend that vessels using fuel with a sulfur content below 0.5% use 40BN cylinder oil.

[0003] At the same time, with the continuous development of engine technology, the operating pressure and temperature of low-speed crosshead two-stroke engines are constantly increasing with the goal of improving combustion efficiency. The temperature of the piston and the upper area of ​​the cylinder liner near the combustion chamber has reached 250°C or even above 300°C. Cylinder oil is sprayed onto each piston through oil injection holes distributed around the cylinder liner for lubrication. The cylinder oil forms a stable oil film between the cylinder liner and piston (piston ring) to fully lubricate the cylinder wall and prevent scratching. At the same time, it is necessary to maintain high-temperature oxidation stability to reduce the formation of deposits on the hot surfaces of the piston and piston rings.

[0004] Chinese patent CN112239697CN discloses a high-base-number marine cylinder oil composition comprising the following components, by weight: a) 10-25 parts detergent; b) 0.5-10 parts dispersant; c) 0-5 parts antioxidant; and d) 60-85 parts base oil. The composition has a calcium content of no less than 20,000 ppm and a base number of no less than 60 KOH / g and no more than 80 KOH / g. It can be used to lubricate the cylinders of low-speed, two-stroke marine diesel engines operating on fuels with a sulfur content greater than 0.5%. However, this composition fails to meet the technical requirements for lubrication of low-speed, two-stroke marine diesel engines operating on fuels with a sulfur content less than 0.5%, and its high-temperature oxidation stability remains unsatisfactory. Furthermore, existing low-base-number marine cylinder oils also commonly suffer from insufficient high-temperature oxidation stability. Summary of the Invention

[0005] The purpose of the present invention is to provide a high-oxidation-resistance low-base-number marine cylinder oil composition, a preparation method and an application thereof, so as to solve the technical problem that the high-temperature oxidation stability of low-base-number marine cylinder oil in the prior art is not ideal.

[0006] To achieve the above object, the technical solution adopted by the present invention is:

[0007] In a first aspect, the present invention provides a high-oxidation-resistant, low-base-number marine cylinder oil composition comprising the following components in parts by weight:

[0008] 10-25 parts of detergent;

[0009] 0.5-10 parts of dispersant;

[0010] 0.5-5 parts of antioxidant;

[0011] 70-85 parts of base oil;

[0012] The base value of the composition is 30 to 50 mgKOH / g;

[0013] The calcium content of the composition is not less than 16000 ppm;

[0014] The detergent comprises sulfonate and sulfurized alkylphenol salt, and the weight ratio of the sulfonate to the sulfurized alkylphenol salt is 5.5-10:1.

[0015] In the present invention, the combination of a sulfonate and a sulfurized alkyl phenol as detergents can provide excellent detergency, dispersibility, and high-temperature oxidative stability. Furthermore, the usage ratio of the sulfonate to the sulfurized alkyl phenol must be controlled within a certain range. A weight ratio of 5.5 to 10:1 can improve the high-temperature oxidative stability of the composition while maintaining a good level of detergency and dispersibility. Excessively low or high weight ratios of the sulfonate to the sulfurized alkyl phenol can result in decreased performance of the composition.

[0016] According to some embodiments of the present invention, the sulfonate is selected from at least one of petroleum calcium sulfonate and synthetic calcium sulfonate.

[0017] According to some embodiments of the present invention, the petroleum calcium sulfonate is selected from at least one of low-alkalinity petroleum calcium sulfonate, medium-alkalinity petroleum calcium sulfonate, high-alkalinity petroleum calcium sulfonate, and ultra-overalkalinity petroleum calcium sulfonate; and / or the synthetic calcium sulfonate is selected from at least one of low-alkalinity synthetic calcium sulfonate, medium-alkalinity synthetic calcium sulfonate, high-alkalinity synthetic calcium sulfonate, and ultra-overalkalinity synthetic calcium sulfonate.

[0018] According to some embodiments of the present invention, the sulfurized alkylphenate includes at least one of high base value sulfurized alkylphenate calcium and medium base value sulfurized alkylphenate calcium.

[0019] According to some embodiments of the present invention, the dispersant is selected from at least one of a polymer ashless dispersant, a succinimide dispersant, and a boronated ashless dispersant.

[0020] According to some preferred embodiments of the present invention, the dispersant is selected from at least one of polymer polyisobutylene succinimide, diene succinimide, monoalkenyl succinimide, high nitrogen diene succinimide, and boronated succinimide.

[0021] According to some embodiments of the present invention, the antioxidant is selected from at least one of amine antioxidants, sulfur-phosphorus zinc salts, and carbamates.

[0022] According to some embodiments of the present invention, the antioxidant includes at least one of a sulfur-phosphorus type zinc salt, a carbamate, and an amine type antioxidant.

[0023] According to some preferred embodiments of the present invention, the weight ratio of at least one of the sulfur-phosphorus type zinc salt, carbamate and the amine type antioxidant is (0.2-4):1; for example, it can be 0.2:1, 0.25:1, 0.3:1, 0.33:1, 0.35:1, 0.4:1, 0.45:1, 0.6:1, 0.8:1, 1:1, 2:1, 3:1, 4:1, etc.

[0024] According to some preferred embodiments of the present invention, the amine antioxidant includes octyl / butyl diphenylamine

[0025] According to some preferred embodiments of the present invention, the sulfur-phosphorus type zinc salt includes at least one of sulfur-phosphorus dioctyl zinc salt, sulfur-phosphorus butyl octyl zinc salt, and di-secondary alkyl dithiophosphate zinc salt.

[0026] According to some embodiments of the present invention, the base oil is selected from at least one of HVI I base oil and HVI II base oil.

[0027] According to some embodiments of the present invention, the composition comprises the following components in parts by weight:

[0028] 12-22 parts of detergent;

[0029] 0.5-5 parts of dispersant;

[0030] 1-5 parts of antioxidant;

[0031] 72-85 parts of base oil.

[0032] According to some embodiments of the present invention, the composition comprises 1 to 4 parts by weight of an antioxidant.

[0033] According to some embodiments of the present invention, the composition further comprises 0 to 5 parts by weight of an anti-wear agent;

[0034] According to some embodiments of the present invention, the anti-wear agent is selected from at least one of sulfur-phosphorus zinc salts and aminothioesters.

[0035] According to some preferred embodiments of the present invention, the antiwear agent comprises thiocarbamate.

[0036] According to some embodiments of the present invention, the composition comprises 0 to 1 parts by weight of an anti-wear agent.

[0037] In a second aspect, the present invention provides a method for preparing the composition described in the first aspect, comprising: adding other components other than the base oil to the base oil at 50-60°C, stirring until all components are dissolved, and obtaining a high-oxidation-resistant, low-base-number marine cylinder oil composition.

[0038] In a third aspect, the present invention provides the use of the composition described in the first aspect or the composition prepared by the preparation method described in the second aspect in lubricating the cylinder part of a marine low-speed two-stroke diesel engine fueled by low-sulfur fuel with a sulfur content of less than 0.5%.

[0039] Fuel with a sulfur content of less than 0.5% is marine residual fuel and complies with the specifications for marine residual fuel specified in ISO8217.

[0040] The beneficial effects of the present invention are at least:

[0041] The present invention provides a high-oxidation-resistance, low-base-number marine cylinder oil composition, which has excellent high-temperature oxidation stability and is suitable for lubricating the cylinder part of a marine low-speed two-stroke crosshead diesel engine using fuel with a sulfur content of less than 0.5%. DETAILED DESCRIPTION

[0042] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments. It should be understood that the specific embodiments described herein are only used to illustrate this patent in detail and do not limit the scope of protection of the present invention in any way.

[0043] 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 this invention belongs. The reagents used in the following examples, unless otherwise specified, are all conventional biochemical reagents; the raw materials, instruments, and equipment used in the following examples, etc., are all commercially available or can be obtained by existing methods; the reagent amounts used, unless otherwise specified, are the amounts used in conventional experimental procedures; and the experimental methods described, unless otherwise specified, are all conventional methods.

[0044] Example 1

[0045] A high-oxidation-resistance, low-base-number marine cylinder oil composition is prepared from the following components in parts by weight:

[0046] (1) Detergent: Ultra-high base synthetic calcium sulfonate T106 (base value 410 mgKOH / g), 7 parts high base synthetic calcium sulfonate T106B (base value 316 mgKOH / g), 1 part high base sulfurized alkyl phenate calcium S206 (base value 280 mgKOH / g), 1.4 parts medium base sulfurized alkyl phenate calcium T121 (base value 160 mgKOH / g), 1.5 parts low base petroleum calcium sulfonate T101 (base value 25 mgKOH / g), 8 parts

[0047] (2) Dispersant: 2 parts of high molecular weight polyisobutylene succinimide T161

[0048] Monoalkenyl succinimide T151, 2 parts

[0049] (3) Antioxidant: dioctyl zinc thiophosphate T203, 0.2 parts

[0050] 0.6 parts of thiophosphonobutyl octyl zinc salt T202

[0051] Octyl / butyl diphenylamine T557, 1 part

[0052] (4) Base oil: 1b 500, 43.3 parts

[0053] 120BS, 32 servings

[0054] The preparation method is as follows: each component is added to the base oil at 50-60° C., and stirred for 1-4 hours until all components are dissolved, thereby obtaining a high-oxidation-resistant and low-base-value marine cylinder oil composition.

[0055] Example 2

[0056] A high-oxidation-resistance, low-base-number marine cylinder oil composition is prepared from the following components in parts by weight:

[0057] (1) Detergent: 6 parts of super-high base synthetic calcium sulfonate T106 (base value 410 mgKOH / g)

[0058] High base synthetic calcium sulfonate T106B (base value 316 mgKOH / g), 3 parts

[0059] 1 part of high base value sulfurized alkyl phenate calcium S206 (base value 280mgKOH / g)

[0060] Medium base value sulfurized alkyl phenol calcium T121 (base value 160mgKOH / g), 1 part

[0061] Low base synthetic calcium sulfonate T104 (base value 25mgKOH / g), 10 parts

[0062] (2) Dispersant: Diolefin succinimide T154, 1 part

[0063] (3) Antioxidant: 0.2 parts of octyl / butyl diphenylamine T557

[0064] Carbamate T531, 0.8 parts

[0065] (4) Base oil: 1b 500, 43.5 parts

[0066] 120BS, 32.5 parts

[0067] (5) Antiwear agent: Thiocarbamate T323, 1 part

[0068] The preparation method is the same as that in Example 1.

[0069] Example 3

[0070] A high-oxidation-resistance, low-base-number marine cylinder oil composition is prepared from the following components in parts by weight:

[0071] (1) Detergent: 3.8 parts of super-high base synthetic calcium sulfonate T106 (base value 410 mgKOH / g)

[0072] High base synthetic calcium sulfonate T106B (base value 316 mgKOH / g), 5 parts

[0073] 1.5 parts of high base value sulfurized alkyl phenate calcium S206 (base value 280mgKOH / g)

[0074] 6 parts of low base synthetic calcium sulfonate T104 (base value 25mgKOH / g)

[0075] (2) Dispersant: Polyisobutylene Succinimide T161, 1 part

[0076] 1 part of bis(alkenyl)succinimide T154

[0077] (3) Antioxidant: 1 part of di-secondary alkyl dithiophosphate zinc salt T205

[0078] Octyl / butyl diphenylamine T557, 3 parts

[0079] (4) Base oil: 1b 500, 44 parts

[0080] 120BS, 33.7 parts

[0081] The preparation method is the same as that in Example 1.

[0082] Example 4

[0083] A high-oxidation-resistance, low-base-number marine cylinder oil composition is prepared from the following components in parts by weight:

[0084] (1) Detergent: High base synthetic calcium sulfonate T106B (base value 316 mgKOH / g), 9 parts

[0085] 3.2 parts of high base value sulfurized alkyl phenate calcium S206 (base value 280mgKOH / g)

[0086] Low base value petroleum calcium sulfonate T101 (base value 280mgKOH / g) 280,9 parts

[0087] (2) Dispersant: Polyisobutylene Succinimide T161, 0.7 parts

[0088] Diolefin succinimide T154, 0.2 parts

[0089] (3) Antioxidant: 1 part of 1-octylthiophosphonate T202

[0090] 1 part of dioctyl zinc thiophosphate T203

[0091] Octyl / butyl diphenylamine T557, 1 part

[0092] (4) Base oil: 1b 500, 40.3 parts

[0093] 120BS, 34.2 parts

[0094] (5) Antiwear agent: Thiocarbamate T323, 0.4 parts

[0095] The preparation method is the same as that in Example 1.

[0096] Example 5

[0097] A high-oxidation-resistance, low-base-number marine cylinder oil composition is prepared from the following components in parts by weight:

[0098] (1) Detergent: 3 parts of super-high base synthetic calcium sulfonate T106 (base value 410 mgKOH / g)

[0099] High base synthetic calcium sulfonate T106B (base value 316 mgKOH / g), 6 parts

[0100] 2 parts of high base value sulfurized alkyl phenate calcium S206 (base value 280mgKOH / g)

[0101] Low base synthetic calcium sulfonate T104 (base value 25mgKOH / g), 7 parts

[0102] (2) Dispersant: 1 part of high nitrogen diene succinimide T146

[0103] Polyisobutylene succinimide T161, 0.4 parts

[0104] (3) Antioxidant: 0.8 parts of thiophosphonobutyl octyl zinc salt T202

[0105] Octyl / butyl diphenylamine T557, 2 parts

[0106] (4) Base oil: 1b 500, 44.7 parts

[0107] 120BS, 33.1 parts

[0108] The preparation method is the same as that in Example 1.

[0109] Comparative Example 1

[0110] A marine cylinder oil composition is prepared from the following components in parts by weight:

[0111] (1) Detergent: 9.4 parts of super-high base synthetic calcium sulfonate T106 (base value 410 mgKOH / g)

[0112] Low base synthetic calcium sulfonate T104 (base value 25mgKOH / g), 5 parts

[0113] (2) Dispersant: 2 parts of high molecular weight polyisobutylene succinimide T161

[0114] Monoalkenyl succinimide T151, 2 parts

[0115] (3) Antioxidant: dioctyl zinc thiophosphate T203, 0.2 parts

[0116] 0.6 parts of thiophosphonobutyl octyl zinc salt T202

[0117] Octyl / butyl diphenylamine T557, 1 part

[0118] (4) Base oil: 1b 500, 33.8 parts

[0119] 120BS, 46 servings

[0120] The preparation method is the same as that in Example 1.

[0121] Comparative Example 2

[0122] A marine cylinder oil composition is prepared from the following components in parts by weight:

[0123] (1) Detergent: 4 parts of super-high base synthetic calcium sulfonate T106 (base value 410 mgKOH / g)

[0124] High base value sulfurized alkyl phenate calcium S206 (base value 280mgKOH / g), 6 parts

[0125] High base calcium alkyl salicylate T109C (base value 320mgKOH / g), 12 parts

[0126] (2) Dispersant: Polyisobutylene Succinimide T161, 0.1 parts

[0127] Diolefin succinimide T154, 0.5 parts

[0128] Boronated polyisobutylene succinimide T154B, 0.5 parts

[0129] (3) Antioxidant: dioctyl zinc thiophosphate T203, 0.1 part

[0130] Octyl / butyl diphenylamine T557, 0.7 parts

[0131] Carbamate T531, 0.2 parts

[0132] (4) Base oil: 1b 500, 45.4 parts

[0133] 120BS, 30.5 parts

[0134] The preparation method is the same as that in Example 1.

[0135] Comparative Example 3

[0136] A marine cylinder oil composition is prepared from the following components in parts by weight:

[0137] (1) Detergent: 6 parts of high base value sulfurized alkyl phenol calcium S206 (base value 280 mgKOH / g)

[0138] Medium base value alkyl phenol calcium sulfate T121 (base value 160mgKOH / g), 4 parts

[0139] 3 parts of low base value petroleum calcium sulfonate T101 (base value 25mgKOH / g)

[0140] High base calcium alkyl salicylate T109C (base value 320mgKOH / g), 5 parts

[0141] (2) Dispersant: 2 parts of high molecular weight polyisobutylene succinimide T161

[0142] Monoalkenyl succinimide T151, 2 parts

[0143] (3) Antioxidant: dioctyl zinc thiophosphate T203, 0.2 parts

[0144] 0.6 parts of thiophosphonobutyl octyl zinc salt T202

[0145] Octyl / butyl diphenylamine T557, 1 part

[0146] (4) Base oil: 1b 500, 46.2 parts

[0147] 120BS, 30 servings

[0148] The preparation method is the same as that in Example 1.

[0149] Comparative Example 4

[0150] A marine cylinder oil composition is prepared from the following components in parts by weight:

[0151] (1) Detergent: 6.5 parts of super-high base synthetic calcium sulfonate T106 (base value 410 mgKOH / g)

[0152] High base synthetic calcium sulfonate T106B (base value 316 mgKOH / g), 3 parts

[0153] 1 part of high base value sulfurized alkyl phenate calcium S206 (base value 280mgKOH / g)

[0154] Medium base value sulfurized alkylphenol calcium T121 (base value 160mgKOH / g), 0.6 parts

[0155] (2) Dispersant: Diolefin succinimide T154, 1 part

[0156] (3) Antioxidant: 0.2 parts of octyl / butyl diphenylamine T557

[0157] Carbamate T531, 0.8 parts

[0158] (4) Base oil: 1b 500, 48.4 parts

[0159] 120BS, 37.5 parts

[0160] (5) Antiwear agent: Thiocarbamate T323, 1 part

[0161] The preparation method is the same as that in Example 1.

[0162] Comparative Example 5

[0163] A marine cylinder oil composition is prepared from the following components in parts by weight:

[0164] (1) Detergent: 7 parts of super-high base synthetic calcium sulfonate T106 (base value 410 mgKOH / g)

[0165] 1.3 parts of high base synthetic calcium sulfonate T106B (base value 316 mgKOH / g)

[0166] 1.4 parts of high base value sulfurized alkyl phenate calcium S206 (base value 280mgKOH / g)

[0167] Medium base value sulfurized alkylphenol calcium T121 (base value 160mgKOH / g), 1.5 parts

[0168] 4 parts of low base value petroleum calcium sulfonate T101 (base value 25mgKOH / g)

[0169] (2) Dispersant: 2 parts of high molecular weight polyisobutylene succinimide T161

[0170] Monoalkenyl succinimide T151, 2 parts

[0171] (3) Antioxidant: dioctyl zinc thiophosphate T203, 0.2 parts

[0172] 0.6 parts of thiophosphonobutyl octyl zinc salt T202

[0173] Octyl / butyl diphenylamine T557, 1 part

[0174] (4) Base oil: 1b 500, 45 parts

[0175] 120BS, 34 servings

[0176] The preparation method is the same as that in Example 1.

[0177] Table 1

[0178]

[0179]

[0180]

[0181] The high-oxidation-resistance, low-base-number marine cylinder oil compositions of the embodiments and the marine cylinder oil compositions of the comparative examples were subjected to an oxidation induction period test and a Komatsu hot pipe test. The test results are shown in Table 2.

[0182] (1) Oxidation induction period test (SH / T 0719)

[0183] Compositions from the Examples or Comparative Examples were used as test samples to evaluate their thermal oxidative stability using pressurized differential scanning calorimetry (PDSC) at a temperature of 200°C and a pressure of 3.5 MPa. The PDSC test examines the ability of an oil to resist oxidation under high temperature, high pressure, and oxygen flow. This resistance is measured by the oxidation induction period (OI) of the test sample; a longer OI period indicates better antioxidant performance.

[0184] (2) Komatsu heat pipe test

[0185] This test examines the high-temperature detergency and high-temperature oxidation stability of oil products. During the test, the test oil is pumped into a high-temperature glass test tube at a fixed speed by air. The oil flows upward with the air until it is pumped out of the test tube. During the test, new oil is continuously pumped into the test tube and old oil is pumped out. After the test, the cleanliness level of the varnish-like substance on the inner wall of the test tube is compared (0-10 levels) to evaluate the high-temperature detergency and high-temperature oxidation stability of the test oil. The higher the test result, the less sediment in the tube, and the better the oil's detergency and high-temperature oxidation stability. The test temperature is 310°C and the test time is 16 hours.

[0186] Table 2 Test results of oil antioxidant performance and detergency

[0187]

[0188] From the above results, it can be seen that the high-oxidation-resistant, low-base-number marine cylinder oil composition provided by the present invention has a calcium content of not less than 16,000 ppm when the base number of the composition is 30 to 50 mgKOH / g, and uses sulfonate and sulfurized alkylphenol in a weight ratio of 5.5 to 10:1 as detergents, so that the composition has excellent high-temperature antioxidant performance and detergency.

[0189] It should be noted that the embodiments described above are only used to explain the present invention and do not constitute any limitation of the present invention. The present invention has been described with reference to typical embodiments, but it should be understood that the words used therein are descriptive and explanatory words, rather than restrictive words. The present invention may be modified as specified within the scope of the claims of the present invention, and the present invention may be revised without departing from the scope and spirit of the present invention. Although the present invention described therein relates to specific methods, materials and embodiments, it does not mean that the present invention is limited to the specific examples disclosed therein. On the contrary, the present invention can be extended to all other methods and applications with the same function.

Claims

1. A high-oxidation-resistance, low-base-number marine cylinder oil composition, characterized in that: The composition comprises the following components in parts by weight: 10-25 parts of detergent; 0.5-10 parts of dispersant; 0.5-5 parts of antioxidant; Base oil 70~85 parts; The base value of the composition is 30 to 50 mgKOH / g; The calcium content of the composition is not less than 16000 ppm; The detergent is a mixture of sulfonate and sulfurized alkylphenol salt, and the weight ratio of the sulfonate to the sulfurized alkylphenol salt is 5.5-10:

1.

2. The composition according to claim 1, characterized in that The sulfonate is selected from at least one of petroleum calcium sulfonate and synthetic calcium sulfonate.

3. The composition according to claim 2, characterized in that The petroleum calcium sulfonate is selected from at least one of low-base petroleum calcium sulfonate, medium-base petroleum calcium sulfonate, high-base petroleum calcium sulfonate, and ultra-overbased petroleum calcium sulfonate; and / or the synthetic calcium sulfonate is selected from at least one of low-base synthetic calcium sulfonate, medium-base synthetic calcium sulfonate, high-base synthetic calcium sulfonate, and ultra-overbased synthetic calcium sulfonate.

4. The composition according to any one of claims 1 to 3, characterized in that The dispersant is selected from at least one of a polymer ashless dispersant, a succinimide dispersant, and a boronized ashless dispersant.

5. The composition according to any one of claims 1 to 3, characterized in that The antioxidant is selected from at least one of amine antioxidants, sulfur-phosphorus zinc salts, and carbamates.

6. The composition according to claim 5, characterized in that The antioxidant includes at least one of sulfur-phosphorus type zinc salt, carbamate and an amine type antioxidant.

7. The composition according to any one of claims 1 to 3, characterized in that The base oil is selected from at least one of HVI Group I base oil and HVI Group II base oil.

8. The composition according to any one of claims 1 to 3, characterized in that The composition comprises the following components in parts by weight: 12-22 parts of detergent; 0.5-5 parts of dispersant; 1-5 parts of antioxidant; 72~85 parts of base oil.

9. The composition according to claim 8, characterized in that The composition includes 1 to 4 parts by weight of an antioxidant.

10. The composition according to any one of claims 1 to 3, characterized in that The composition further comprises 0 to 5 parts by weight of an anti-wear agent.

11. The composition according to claim 10, characterized in that The anti-wear agent is selected from at least one of sulfur-phosphorus zinc salt and aminothioester; and / or the composition comprises 0 to 1 parts by weight of the anti-wear agent.

12. A method for preparing the composition according to any one of claims 1 to 11, characterized in that: include: The other components except the base oil are added into the base oil at 50-60° C. and stirred until all components are dissolved to obtain a high-oxidation-resistance low-base-value marine cylinder oil composition.

13. Use of the composition according to any one of claims 1 to 11 or the composition prepared by the preparation method according to claim 12 for lubricating the cylinder of a low-speed two-stroke marine diesel engine fueled by low-sulfur fuel having a sulfur content of less than 0.5%.

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