Lubricating oil composition, method for producing the same, and gas engine lubricating oil

Abstract

This invention relates to the field of lubricating oil technology, and provides a lubricating oil composition, its preparation method, and a gas engine lubricating oil. The gas engine lubricating oil comprises 0.5-4 parts by weight of detergent, 1-10 parts by weight of dispersant, 1-10 parts by weight of antioxidant, 0.1-0.8 parts by weight of pour point depressant, 0.01-0.3 parts by weight of antifoaming agent, and 65-95 parts by weight of base oil; the antioxidant comprises ZDDP, phenolic ester antioxidants, amine antioxidants, and aminothioester antioxidants in a weight ratio of 1:(2-7):(1-6):(0.8-2). The gas engine lubricating oil provided by this invention, through the synergistic effect of different types of antioxidants, not only possesses good high-temperature detergency, antioxidant properties, and dispersibility, but also excellent anti-wear properties, fully meeting the requirements for gas engine lubricating oils using LNG or LPG.

Description

Technical Field

[0001] This invention relates to the field of lubricating oil technology, and more specifically, to lubricating oil compositions, methods for preparing the same, and lubricating oils for gas engines. Background Technology

[0002] Gas engines using fuels such as LNG (liquefied natural gas) and LPG (liquefied petroleum gas) generally use low-ash gas engine oils for cylinder and crankcase lubrication to protect components such as valves and spark plugs and to prevent pre-ignition failures. These gas engine oils need to possess good high-temperature detergency, oxidation resistance, nitration resistance, dispersibility, and anti-wear properties. Existing gas engine lubricants do not have ideal anti-wear properties and need improvement. Summary of the Invention

[0003] The purpose of this invention is to provide a gas engine lubricating oil, its preparation method, and its application, so as to solve the technical problem that the anti-wear properties of gas engine lubricating oils in the prior art are not ideal.

[0004] To achieve the above objectives, in a first aspect, the present invention provides a lubricating oil composition comprising the following components in parts by weight: 0.5 to 4 parts detergent; 1 to 10 parts dispersant; 1 to 10 parts antioxidant; 0.1 to 0.8 parts pour point depressant; 0.01 to 0.8 parts antifoaming agent; and 65 to 95 parts base oil; wherein the antioxidant comprises ZDDP (zinc dialkyl dithiophosphate), phenolic ester antioxidant, amine antioxidant, and aminothioester antioxidant in a weight ratio of 1:(2 to 7):(1 to 6):(0.8 to 2).

[0005] According to some embodiments of the present invention, the amount of the cleaning agent is 0.5 to 3 parts by weight.

[0006] According to some embodiments of the present invention, the amount of the dispersant is 2 to 6 parts by weight.

[0007] According to some embodiments of the present invention, the amount of the antioxidant is 1 to 6 parts by weight.

[0008] According to some embodiments of the present invention, the amount of the pour point depressant is 0.1 to 0.6 parts by weight.

[0009] According to some embodiments of the present invention, the amount of the antifoaming agent is 0.02 to 0.3 parts by weight.

[0010] According to some embodiments of the present invention, the amount of the base oil is 80 to 95 parts by weight.

[0011] According to some embodiments of the present invention, the ZDDP is selected from at least one of T202 and T203.

[0012] According to some embodiments of the present invention, the amine antioxidant is selected from at least one of T534, T557, and T558.

[0013] According to some embodiments of the present invention, the phenolic ester antioxidant is selected from at least one of T535 and T512.

[0014] According to some embodiments of the present invention, the aminothioester antioxidant is T323.

[0015] According to some embodiments of the present invention, the detergent is selected from at least one of salicylates and sulfide alkylphenol salts.

[0016] According to some embodiments of the present invention, the dispersant is selected from at least one of bis(succinimide) and high molecular weight succinimide, wherein the molecular weight of the high molecular weight succinimide is 2200 to 2700.

[0017] According to some embodiments of the present invention, the pour point depressant is selected from at least one of polymethyl methacrylate (PMA) and alkyl naphthalene.

[0018] According to some embodiments of the present invention, the antifoaming agent is selected from methyl silicone oil, or a composite antifoaming agent (referring to a commercially available composite antifoaming agent, preferably No. 2 composite antifoaming agent).

[0019] According to some embodiments of the present invention, the base oil is selected from hydrotreated base oils, preferably Group II hydrotreated base oils.

[0020] In a second aspect, the present invention provides a method for preparing the lubricating oil composition described in the first aspect, comprising: mixing raw materials containing each component to obtain the lubricating oil composition; wherein the mixing temperature is 50-70°C and the mixing time is 1-2 hours.

[0021] Thirdly, the present invention provides the application of the lubricating oil composition of the first aspect in a gas engine using LPG or LNG as fuel. The gas engine lubricating oil contains the lubricating oil composition of any one of the above claims, wherein the gas engine uses LNG or LPG as fuel.

[0022] The beneficial effects of this invention are at least as follows:

[0023] ZDDP is a highly efficient antioxidant and anti-wear agent of metal salts, widely used in internal combustion engine oils. However, ZDDP has a high sulfate ash content, which limits its dosage in natural gas engine oils. The natural gas engine lubricating oil provided by this invention improves anti-wear properties through the synergistic effect between different types of antioxidants. The natural gas engine lubricating oil provided by this invention not only has good high-temperature detergency, anti-oxidation, anti-nitrification and dispersibility, but also excellent anti-wear properties, which can fully meet the usage requirements of natural gas engine lubricating oils. Detailed Implementation

[0024] To make the technical problem to be solved, the technical solution, and the beneficial effects of this invention clearer, the invention will be further described in detail below with reference to specific embodiments. It should be understood that the specific embodiments described herein are merely for illustrating this patent and do not limit the scope of protection of this invention in any way.

[0025] Unless otherwise defined, the technical terms used in the following embodiments have the same meaning as commonly understood by those skilled in the art. Unless otherwise specified, the reagents used in the following embodiments are conventional biochemical reagents; the raw materials, instruments, and equipment used in the following embodiments can all be obtained commercially or by existing methods; unless otherwise specified, the reagent dosages are those used in routine experimental operations; unless otherwise specified, the experimental methods are conventional methods.

[0026] In the embodiments and comparative examples of this invention, the sources of raw materials used to prepare the lubricating oil are as follows:

[0027] Cleaning agent:

[0028] Calcium salicylate T109A was purchased from Wuxi Southern Petroleum Additives Co., Ltd.

[0029] Alkylphenol calcium S206 was purchased from Wuxi Southern Petroleum Additives Co., Ltd.

[0030] Dispersant:

[0031] Bissuccinimide T154, purchased from Ruifeng New Materials;

[0032] High molecular weight succinimide T161 was purchased from Ruifeng New Materials.

[0033] Antioxidants:

[0034] ZDDP T202, purchased from Wuxi Southern Petroleum Additives Co., Ltd.

[0035] T203 was purchased from Wuxi Southern Petroleum Additives Co., Ltd.

[0036] Amine-type antioxidants T534, T557, and T558 were purchased from Beijing Xingpu Fine Chemical Technology Development Co., Ltd.

[0037] Aminothioester antioxidant T323 was purchased from Shanghai Qike Chemical.

[0038] Phenolic ester antioxidants T512 and T535 were purchased from Shanghai Qike Chemical Co., Ltd.

[0039] Pour point depressant T866 was purchased from Sinopec.

[0040] Antifoaming agent #2, a composite antifoaming agent, was purchased from Sinopec.

[0041] The base oil is a Group II hydrotreated base oil, purchased from Sinopec.

[0042] The lubricating oils of each embodiment and comparative example were prepared according to the formulations (parts by weight) shown in Table 1.

[0043] The specific preparation method includes: heating and stirring the mixture containing each raw material component at 60°C for 1 hour until completely homogeneous to obtain the lubricating oil.

[0044] Table 1

[0045]

[0046] The performance of the lubricating oils in each embodiment and comparative example was tested. The test methods are as follows:

[0047] (1) High-temperature detergency: The coke weight was determined by the crankcase simulation test method according to SH / T 0300. The lower the coke weight, the better the high-temperature detergency of the oil.

[0048] (2) Antioxidant properties: SH / T 0719 Test method for oxidation induction period of lubricating oil, the oxidation induction period is determined. The longer the oxidation induction period, the better the antioxidant properties of the oil.

[0049] (3) Dispersibility: ASTM D7899 Determination of dispersibility of engine oils in use (filter paper spot method), with a score. The higher the dispersibility score, the better the dispersibility of the oil.

[0050] (4) Anti-wear properties: The FZG visual inspection method is used to determine the FZG failure level in NB / SH / T 0306 evaluation of the load-carrying capacity of lubricating oils. The higher the FZG failure level, the better the anti-wear properties of the oil, with a maximum failure level of 12.

[0051] The test results are shown in Table 2.

[0052] Table 2

[0053]

[0054] As can be seen from the above test results, the gas engine lubricating oils provided in Examples 1-7 of the present invention not only have good high-temperature detergency, anti-oxidation and dispersibility, but also have significantly improved anti-wear properties, making them more suitable for the lubrication of gas engines.

[0055] It should be noted that the embodiments described above are only for explaining the present invention and do not constitute any limitation on the present invention. The present invention has been described with reference to typical embodiments, but it should be understood that the words used therein are descriptive and explanatory terms, not limiting terms. Modifications can be made to the present invention within the scope of the claims, and revisions can be made to the present invention without departing from the scope and spirit of the present invention. Although the present invention described herein relates to specific methods, materials, and embodiments, it does not mean that the present invention is limited to the specific examples disclosed herein; on the contrary, the present invention can be extended to all other methods and applications with the same function.

Claims

1. A lubricating oil composition, characterized in that, Components including parts by weight: 0.5 to 4 parts of cleaning agent; 1-10 parts of dispersant; Antioxidant 1-10 parts; 0.1–0.8 parts of pour point depressant; Antifoaming agent 0.01-0.8 parts; Base oil 65-95 parts; The antioxidants include zinc dialkyl dithiophosphate, phenolic ester antioxidants, amine antioxidants and aminothioester antioxidants in a weight ratio of 1:(2-7):(1-6):(0.8-2).

2. The lubricating oil composition according to claim 1, characterized in that, Components including parts by weight: The cleaning agent is 0.5 to 3 parts; The dispersant is 2-6 parts; The antioxidant is 1 to 6 parts; The pour point depressant is 0.1 to 0.6 parts; The antifoaming agent is 0.02-0.3 parts; The base oil is 80-95 parts.

3. The lubricating oil composition according to claim 1 or 2, characterized in that, The zinc dialkyl dithiophosphate is selected from at least one of T202 and T203; And / or, the amine antioxidant is selected from at least one of T534, T557, and T558; And / or, the phenolic ester antioxidant is selected from at least one of T535 and T512; And / or, the aminothioester antioxidant is T323.

4. The lubricating oil composition according to any one of claims 1-3, characterized in that, The detergent is selected from at least one of salicylates and sulfide alkylphenol salts.

5. The lubricating oil composition according to any one of claims 1-4, characterized in that, The dispersant is selected from at least one of bis(succinimide) and high molecular weight succinimide; the molecular weight of the high molecular weight succinimide is 2200-2700.

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

7. The lubricating oil composition according to any one of claims 1-6, characterized in that, The antifoaming agent is selected from methyl silicone oil.

8. The lubricating oil composition according to any one of claims 1-7, characterized in that, The base oil is a hydrotreated base oil.

9. A method for preparing the lubricating oil composition according to any one of claims 1-8, characterized in that, include: The raw materials containing the aforementioned components are mixed to obtain the lubricating oil composition; the mixing temperature is 50-70°C and the mixing time is 1-2 hours.

10. A gas engine lubricating oil, characterized in that, The gas engine contains the lubricating oil composition according to any one of claims 1-8, and the gas engine uses LNG or LPG as fuel.

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