Natural gas engine lubricating oil and preparation method and application thereof

Abstract

The invention relates to the technical field of lubricating oil, and provides natural gas engine lubricating oil as well as a preparation method and application thereof. The natural gas engine lubricating oil comprises the following components in parts by weight: 1-5 parts of a clearing agent, 1-15 parts of a dispersing agent, 1-10 parts of an antioxidant, 0.1-1 part of a pour point depressant, 0.01-1 part of an anti-foaming agent and 60-95 parts of base oil, the antioxidant comprises ZDDP, an amine type antioxidant and an amino thioester antioxidant according to the weight ratio of 1: (3-8): (3-8). The natural gas engine lubricating oil provided by the invention not only has good high-temperature detergency, oxidation resistance, dispersity and wear resistance through the synergistic effect of different types of antioxidants, but also has excellent nitration resistance, and can completely meet the use requirements of the natural gas engine lubricating oil, and the sulfate ash content can be controlled to be 0.4-0.6%.

Description

Technical Field

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

[0002] Compared with traditional diesel engines, natural gas engines have the environmental advantages of low sulfur and low carbon. When natural gas engines are working, high temperature and high pressure cause nitrogen molecules in the air to break into nitrogen atoms, which react with oxygen to produce nitrogen oxides. Some of these nitrogen oxides are very unstable. After entering the crankcase through the gap between the piston and the cylinder liner, they will come into contact with the engine oil and react to produce nitro compounds, and finally produce sludge. Engine oil nitration is a phenomenon unique to natural gas engines. Therefore, in addition to requiring good high-temperature detergency, oxidation resistance, dispersibility and wear resistance, anti-nitration properties are also very important for natural gas engine lubricants. However, the anti-nitration performance of existing natural gas engine lubricants is not ideal and needs to be improved. Summary of the invention

[0003] The object of the present invention is to provide a natural gas engine lubricating oil and a preparation method and application thereof, so as to solve the technical problem that the anti-nitration performance of natural gas engine lubricating oil in the prior art is not ideal.

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

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

[0006] Detergent: 1 to 5 parts;

[0007] Dispersant: 1-15 parts;

[0008] Antioxidant: 1-10 parts;

[0009] Pour point depressant: 0.1-1 part;

[0010] Antifoaming agent: 0.01-1 part;

[0011] Base oil: 60-95 parts;

[0012] The antioxidant comprises ZDDP (zinc dialkyl dithiophosphate antioxidant and anti-wear agent), amine antioxidant and aminothiolipin antioxidant in a weight ratio of 1:(3-8):(3-8).

[0013] According to some embodiments of the present invention, the ZDDP includes at least one of T202, T203, and T205.

[0014] According to some embodiments of the present invention, the amine antioxidant includes at least one of T534, T557, and T558.

[0015] According to some embodiments of the invention, the aminothiolipin antioxidant comprises T323.

[0016] According to some embodiments of the present invention, the detergent is used in an amount of 1 to 3 parts by weight.

[0017] According to some embodiments of the present invention, the amount of the dispersant used is 3 to 8 parts by weight.

[0018] According to some embodiments of the present invention, the antioxidant is used in an amount of 3 to 8 parts by weight.

[0019] According to some embodiments of the present invention, the pour point depressant is used in an amount of 0.3 to 0.7 parts by weight.

[0020] According to some embodiments of the present invention, the antifoaming agent is used in an amount of 0.02 to 0.5 parts by weight.

[0021] According to some embodiments of the present invention, the base oil is used in an amount of 80 to 90 parts by weight.

[0022] According to some embodiments of the present invention, the detergent is selected from at least one of salicylates, sulfonates, and sulfurized alkylphenols.

[0023] According to some embodiments of the present invention, the dispersant is selected from at least one of monosuccinimide dispersant, bissuccinimide, and polymer succinimide.

[0024] According to some embodiments of the present invention, the pour point depressant is selected from at least one of polymethacrylate (PMA) and alkyl naphthalene.

[0025] According to some embodiments of the present invention, the anti-foaming agent is selected from at least one of methyl silicone oil and polyacrylate.

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

[0027] In a second aspect, the present invention provides a method for preparing the lubricating oil described in the first aspect, comprising: mixing and stirring the components to obtain the natural gas engine lubricating oil.

[0028] According to some embodiments of the present invention, the temperature of the mixing and stirring is 50 to 70° C., and the time is 1 to 2 hours.

[0029] In a third aspect, the present invention provides use of the lubricating oil described in the first aspect in a natural gas engine.

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

[0031] The natural gas engine lubricating oil provided by the present invention has good high-temperature detergency, oxidation resistance, dispersibility and wear resistance through the synergistic effect of different types of antioxidants, and the sulfated ash content can be controlled at 0.4-0.6%, and it can also have excellent anti-nitrification properties, which can fully meet the use requirements of natural gas engine lubricating oil. DETAILED DESCRIPTION

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

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

[0034] The lubricating oils of various examples and comparative examples were prepared according to the formulations shown in Table 1. The specific preparation method comprises: heating and stirring a mixture including various raw material components at 60° C. for 1 hour until the mixture is completely uniform, thereby preparing the lubricating oil.

[0035] Table 1

[0036]

[0037]

[0038] The lubricating oils of the embodiments and comparative examples were tested for performance. The testing methods are as follows:

[0039] (1) High temperature detergency: SH / T 0300 crankcase simulation test method, to measure the coke weight. The smaller the coke weight, the better the high temperature detergency of the oil.

[0040] (2) Antioxidation: SH / T 0719 Lubricating Oil Oxidation Induction Period Determination Method, the oxidation induction period is measured. The longer the oxidation induction period, the better the oil's antioxidation property.

[0041] (3) Dispersibility: ASTM D7899 is used to measure the dispersibility of in-use engine oils (filter paper spot method), and the scores are measured. The higher the dispersibility score, the better the dispersibility of the oil.

[0042] (4) Anti-wear property: GB / T 3142 Determination of the load-bearing capacity of lubricating oils, and determination of the maximum no-seizure load. The greater the maximum no-seizure load, the better the anti-wear property of the oil.

[0043] (5) Nitration performance: Heat the lubricating oil to 100°C and introduce nitrogen dioxide gas into the oil at a rate of 0.5L / min to cause the lubricating oil to undergo nitration reaction. After 16 hours, the nitration value increment of the lubricating oil is measured using the ASTM E2412 infrared spectrometry method. The smaller the nitration value increment, the better the oil's resistance to nitration.

[0044] (6) Sulfated ash: GB / T 2433 Determination of sulfated ash content of additives and lubricating oils containing additives, determination of sulfated ash (mass fraction).

[0045] The test results are shown in Table 2.

[0046] Table 2

[0047]

[0048]

[0049] It can be seen from the above test results that the natural gas engine lubricating oil provided by the present invention not only has good high-temperature detergency, oxidation resistance, dispersibility, wear resistance and low sulfate ash content, but also has significantly improved anti-nitrification performance, making it more suitable for use in natural gas engines.

[0050] It should be noted that the embodiments described above are only used to explain the present invention and do not constitute any limitation to the present invention. The present invention has been described with reference to typical embodiments, but it should be understood that the words used therein are descriptive and explanatory words, rather than restrictive words. The present invention may be modified as specified within the scope of the claims of the present invention, and the present invention may be revised without departing from the scope and spirit of the present invention. Although the present invention described therein relates to specific methods, materials and embodiments, it does not mean that the present invention is limited to the specific examples disclosed therein, on the contrary, the present invention can be extended to all other methods and applications with the same functions.

Claims

1. A natural gas engine lubricating oil, characterized in that: The composition comprises the following components in parts by weight: Detergent: 1 to 5 parts; Dispersant: 1-15 parts; Antioxidant: 1-10 parts; Pour point depressant: 0.1-1 part; Antifoaming agent: 0.01-1 part; Base oil: 60-95 parts; The antioxidant comprises ZDDP, amine antioxidant and aminothiolipid antioxidant in a weight ratio of 1:(3-8):(3-8).

2. The lubricating oil according to claim 1, characterized in that The ZDDP includes at least one of T202, T203, and T205; And / or, the amine antioxidant includes at least one of T534, T557, and T558; And / or, the aminothiolipin antioxidant includes T323.

3. The lubricating oil according to claim 1 or 2, characterized in that: The amount of the detergent is 1 to 3 parts by weight; And / or, the amount of the dispersant is 3 to 8 parts by weight; And / or, the antioxidant is used in an amount of 3 to 8 parts by weight; and / or, the pour point depressant is used in an amount of 0.3 to 0.7 parts by weight; And / or, the antifoaming agent is used in an amount of 0.02 to 0.5 parts by weight; And / or, the base oil is used in an amount of 80 to 90 parts by weight.

4. The lubricating oil according to any one of claims 1 to 3, characterized in that: The detergent is selected from at least one of salicylates, sulfonates, and sulfurized alkylphenols.

5. The lubricating oil according to any one of claims 1 to 4, characterized in that: The dispersant is selected from at least one of monosuccinimide dispersant, bissuccinimide, and high molecular weight succinimide.

6. The lubricating oil according to any one of claims 1 to 5, characterized in that: The pour point depressant is selected from at least one of polymethacrylate and alkyl naphthalene.

7. The lubricating oil according to any one of claims 1 to 6, characterized in that: The anti-foaming agent is selected from at least one of methyl silicone oil and polyacrylate.

8. The lubricating oil according to any one of claims 1 to 7, characterized in that: The base oil is selected from at least one of Group I base oil and Group II hydrogenated base oil.

9. The method for preparing the lubricating oil according to any one of claims 1 to 8, characterized in that: include: The natural gas engine lubricating oil can be obtained by mixing and stirring the components.

10. Use of the lubricating oil according to any one of claims 1 to 8 in a natural gas engine.

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