A nano-molybdenum disulfide mineral lubricant and its application in reducing engine blowby

Abstract

The present invention relates to a nano-scale mineral molybdenum disulfide lubricant, comprising the following components: 100 parts by weight of base oil; 9-12 parts by weight of nano-scale mineral molybdenum disulfide; 0.9-2.4 parts by weight of overbased sulfurized calcium alkylphenate; 1.4-3.4 parts by weight of succinate; 1-2.3 parts by weight of hydrogenated styrene-isoprene block copolymer; 0.9-2.5 parts by weight of a fumarate-type pour point depressant; 0.4-1.3 parts by weight of N-phenyl-N-sec-butyl-p-phenylenediamine; and 0.8-2.8 parts by weight of an anti-wear agent. The lubricant can significantly reduce engine blowby.

Description

Technical Field

[0001] The present invention relates to the technical field of lubricating oils, and in particular to a nano-molybdenum disulfide mineral lubricating oil and application thereof in reducing engine air leakage. Background Art

[0002] Blowby is one of the key engine performance parameters, having the most sensitive impact on engine performance, emissions, and component reliability. Blowby gases from the combustion chamber, through the cylinder block, piston, and piston ring clearances, are the primary component of engine blowby, accounting for 60%-70% of total blowby. The valvetrain contributes 20%-30%, with the remainder coming from turbocharged blowby gases entering the crankcase.

[0003] National standard leakage limit: The leakage limit of the low-power version engine is 60.0L / min, and the leakage limit of the high-power version engine is 80.0L / min.

[0004] In the prior art, traditional lubricating oils are not very effective in reducing engine blowby, which reduces engine efficiency. Summary of the Invention

[0005] To solve the above problems, the present invention provides a nano-molybdenum disulfide mineral lubricant, which can significantly reduce engine air leakage. The lubricant comprises the following components:

[0006] 100 parts by weight of base oil;

[0007] 9-12 parts by weight of nano-scale mineral molybdenum disulfide;

[0008] 0.9-2.4 parts by weight of overbased sulfurized alkylphenate calcium;

[0009] 1.4-3.4 parts by weight of succinate;

[0010] 1-2.3 parts by weight of viscosity index improver;

[0011] 0.9-2.5 parts by weight of pour point depressant;

[0012] 0.4-1.3 parts by weight of antioxidant;

[0013] 0.8-2.8 parts by weight of air leakage improving anti-wear agent;

[0014] 0.1-2 parts by weight of stearic acid

[0015] Sodium silicate 0.1-2 parts by weight.

[0016] The base oil is one of 60N, 150N, 250N, 350N, 400N and 500N or a combination of several of them in any ratio.

[0017] The mass ratio of the Class II base oil 150N to the Class II base oil 500N is 1:0.2-1.

[0018] The viscosity index improver is selected from one or more of ethylene-propylene copolymer, styrene-isoprene copolymer, hydrogenated styrene-isoprene block copolymer and polyisobutylene.

[0019] The pour point depressant is selected from one or more of a fumarate pour point depressant, an alkyl naphthalene pour point depressant, a polymethacrylate pour point depressant, and a polyolefin pour point depressant.

[0020] The antioxidant is selected from one or more of 2,6-di-tert-butylphenol, diisooctyldiphenylamine, N-phenyl-N-sec-butyl-p-phenylenediamine, and 4-octyl-N-(4-octylphenyl)aniline.

[0021] The particle size of the nano-scale mineral molybdenum disulfide is 80-600nm.

[0022] The anti-wear agent is a mixture of tricresyl phosphate, aminothioester and ammonium thiophosphate.

[0023] The anti-wear agent is composed of the following substances and parts by weight:

[0024] 0.6-1.5 parts by weight of aminothioester;

[0025] 0.3-1.2 parts by weight of ammonium thiophosphate.

[0026] The preparation method comprises the following steps:

[0027] 1. Pump the hydrogenated base oil into the blending kettle through the filter pump and gradually heat it up; add the viscosity index improver and stir for 15-20 minutes until it is evenly mixed;

[0028] 2. Add composite additives, pour point depressant, etc., keep stirring at the above temperature for 30-45 minutes, stir evenly and completely mix;

[0029] 3. Add the main agent of nano-scale mineral molybdenum disulfide into the blending kettle in sequence, start pulse blending, heat at the same time, blend to a certain temperature, and stir evenly;

[0030] 4. Pulse blending for 40-60 minutes until the mixture is evenly mixed.

[0031] The present invention also relates to the use of the aforementioned nano-scale mineral molybdenum disulfide lubricant in reducing engine air leakage.

[0032] In the present invention, the lubricating oil containing nano-scale mineral molybdenum disulfide produces oil film and molybdenum film during operation. The molybdenum film greatly increases the mechanical sealing and significantly reduces the blowby of the combustion chamber through the cylinder block, piston, and piston ring gap. The engine leakage index is qualitatively improved, breaking through the industry's inherent thinking of reducing leakage by improving hardware.

[0033] Definition and Explanation:

[0034] Unless otherwise indicated, the following terms and phrases used herein are intended to have the following meanings. A particular phrase or term should not be construed as ambiguous or unclear unless specifically defined, but rather should be understood in accordance with its ordinary meaning. When a trade name appears herein, it is intended to refer to the corresponding commercial product or its active ingredient.

[0035] The intermediate compounds of the present invention can be prepared by a variety of synthetic methods well known to those skilled in the art, including the specific embodiments listed below, embodiments formed by combining them with other chemical synthesis methods, and equivalent replacement methods well known to those skilled in the art. Preferred embodiments include but are not limited to the examples of the present invention.

[0036] The chemical reactions of the present invention are carried out in suitable solvents that are compatible with the chemical transformations of the present invention and the reagents and materials required. To obtain the compounds of the present invention, it may sometimes be necessary for those skilled in the art to modify or select synthetic steps or reaction schemes based on existing embodiments.

[0037] The present invention will be described in detail below through examples, which are not intended to limit the present invention in any way. DETAILED DESCRIPTION

[0038] The present invention is described in detail below by way of examples, but this is not intended to limit the present invention in any way. While the present invention has been described in detail herein, including specific embodiments thereof, it will be apparent to those skilled in the art that various changes and modifications can be made to the specific embodiments of the present invention without departing from the spirit and scope of the present invention. Experimental methods in the following examples, where specific conditions are not specified, were performed according to conventional methods and conditions, or as selected from commercially available specifications.

[0039] A nano-scale mineral molybdenum disulfide lubricant can significantly reduce engine air leakage. The lubricant includes the following components:

[0040] 100 parts by weight of base oil;

[0041] 9-12 parts by weight of nano-scale mineral molybdenum disulfide;

[0042] 0.9-2.4 parts by weight of overbased sulfurized alkylphenate calcium;

[0043] 1.4-3.4 parts by weight of succinate;

[0044] 1-2.3 parts by weight of viscosity index improver;

[0045] 0.9-2.5 parts by weight of pour point depressant;

[0046] 0.4-1.3 parts by weight of antioxidant;

[0047] 0.8-2.8 parts by weight of air leakage improving anti-wear agent;

[0048] 0.1-2 parts by weight of stearic acid

[0049] Sodium silicate 0.1-2 parts by weight.

[0050] As a preferred embodiment, the base oil is a mixture of Group II base oil 150N and Group II base oil 500N.

[0051] As a preferred embodiment, the mass ratio of the Group II base oil 150N to the Group II base oil 500N is 1:0.2-1.

[0052] As a preferred embodiment, the particle size of the nano-scale mineral molybdenum disulfide is 80-600 nm.

[0053] As a preferred embodiment, the blowby improving anti-wear agent is a thio-based anti-wear agent.

[0054] As a preferred embodiment, the thio-based anti-wear agent is selected from one or two of aminothioesters and thiophosphate amine salts.

[0055] As a preferred embodiment, the air leakage improving anti-wear agent is composed of the following substances and parts by weight:

[0056] 0.6-1.5 parts by weight of aminothioester;

[0057] 0.3-1.2 parts by weight of ammonium thiophosphate.

[0058] As a preferred embodiment, the mass ratio of the aminothioester to the thiophosphate amine salt is 1-3:1.

[0059] As a preferred embodiment, the preparation method comprises the following steps:

[0060] 1. Pump the hydrogenated base oil into the blending kettle through the filter pump and gradually heat it; add the hydrogenated styrene-isoprene block copolymer and stir for 15-20 minutes until it is evenly mixed;

[0061] 2. Add air leakage improvement anti-wear agent, high base value sulfurized alkylphenol calcium, succinate, fumarate type pour point depressant and N-phenyl-N-sec-butyl-p-phenylenediamine, always maintain the above temperature and stir for 30-45 minutes, stir evenly and completely mix;

[0062] 3. Add the nano-scale mineral molybdenum disulfide mineral main agent into the blending kettle in sequence, start pulse blending, heat at the same time, blend to a certain temperature, and stir evenly;

[0063] 4. Pulse blending for 40-60 minutes until the mixture is evenly mixed.

[0064] In the embodiment:

[0065] The mass ratio of Class II base oil 150N to Class II base oil 500N is 1:0.5;

[0066] 10 parts by weight of nanoscale mineral molybdenum disulfide (100 nm), Henan Yongfeng Molybdenum Industry Co., Ltd.

[0067] Detergent: 2 parts by weight of high base value sulfurized alkyl phenol calcium

[0068] Dispersant: 2 parts by weight of succinate,

[0069] Viscosity index improver: 2 parts by weight of hydrogenated styrene-isoprene block copolymer,

[0070] Pour point depressant: 1 part by weight of fumarate type pour point depressant,

[0071] Antioxidant: 1 part by weight of N-phenyl-N-sec-butyl-p-phenylenediamine,

[0072] The anti-wear agent is composed of the following substances and parts by weight:

[0073] 1 part by weight of aminothioester;

[0074] 1 part by weight of ammonium thiophosphate.

[0075] All materials are purchased from the market.

[0076] Testing Process

[0077] With the engine throttle fully open, start from the rated speed (maximum speed) and reduce the speed by 500 rpm (at least 8 times) to test the piston leakage. At the same time, record the torque, water temperature, oil temperature and other related parameters at each speed point. Also, control the oil temperature at 95±5℃ and the water temperature at 88±5℃.

[0078] This test was conducted from the maximum speed of 5500 rpm to 1000 rpm, with a total of ten points, and the standard state power, oil temperature, water inlet temperature, and water outlet temperature were controlled and recorded.

[0079] Lubricating oil includes the following components:

[0080] 100 parts by weight of base oil (the mass ratio of Class II base oil 150N to Class II base oil 500N is 0.5-1);

[0081] 2 parts by weight of overbased sulfurized alkylphenate calcium;

[0082] 2 parts by weight of succinate;

[0083] 2 parts by weight of hydrogenated styrene-isoprene block copolymer;

[0084] 2 parts by weight of fumarate-type pour point depressant;

[0085] 1 part by weight of N-phenyl-N-sec-butyl-p-phenylenediamine;

[0086] Nano-scale mineral molybdenum disulfide (100 nanometer flakes, Henan Yongfeng Molybdenum Co., Ltd.), air leakage improvement anti-wear agent, specific proportions are shown in the table below:

[0087] Antiwear agent 1 Antiwear agent 2 Molybdenum disulfide Leakage Example 1 1.8 parts by weight of sodium silicate 0.2 parts by weight of stearic acid 10 parts by weight 28.72 Example 2 1.5 parts by weight of sodium silicate 0.5 parts by weight of stearic acid 10 parts by weight 27.93 Example 3 1 part by weight of sodium silicate 1 part by weight of stearic acid 10 parts by weight 27.64 Example 4 0.5 parts by weight of sodium silicate 1.5 parts by weight of stearic acid 10 parts by weight 28.12 Example 5 0.2 parts by weight of sodium silicate 1.8 parts by weight of stearic acid 10 parts by weight 28.85 Example 6 0.1 parts by weight of sodium silicate 0.2 parts by weight of stearic acid 10 parts by weight 28.97 Comparative Example 1 2 parts by weight of sodium silicate - 10 parts by weight 30.05 Comparative Example 2 - 2 parts by weight of stearic acid 10 parts by weight 30.12 Comparative Example 3 1 part by weight of sodium carbonate 1 part by weight of stearic acid 10 parts by weight 30.21 Comparative Example 4 1 part by weight of sodium silicate 1 part by weight of behenic acid 10 parts by weight 30.37 Comparative Example 5 1 part by weight of potassium carbonate 1 part by weight of behenic acid 10 parts by weight 30.67 Comparative Example 6 1 part by weight of sodium silicate 1 part by weight of stearic acid - 32.14

[0088] The relevant experimental data are as follows

[0089] Example 1 Experimental data

[0090]

[0091] Example 2 Experimental data

[0092]

[0093]

[0094] Example 3 Experimental data

[0095]

[0096] Example 4 Experimental data

[0097]

[0098] Example 5 Experimental Data

[0099]

[0100]

[0101] Example 6 Experimental Data

[0102]

[0103] Comparative Example 1 Experimental Data

[0104]

[0105]

[0106] Comparative Example 2 Experimental Data

[0107]

[0108]

[0109] Comparative Example 3 Experimental Data

[0110]

[0111] Comparative Example 4 Experimental Data

[0112]

[0113]

[0114] Comparative Example 5 Experimental Data

[0115]

[0116]

[0117] Comparative Example 6 Experimental Data

[0118]

[0119] It can be seen that the average air leakage of the test oil of the solution of the present invention is lower. In particular, Example 3, which uses 1 part by weight of sodium silicate and 1 part by weight of stearic acid, has an even lower average air leakage, which is the lowest point of the average air leakage of all the data.

[0120] The national standard for air leakage is 60.0 L / min for low-power engines and 80.0 L / min for high-power engines. The average air leakage rate for the reference oil (Comparative Example 6) was only 32.14 L / min, significantly lower than the national standard air leakage rate limit. The lubricating oil containing nano-scale mineral molybdenum disulfide reduces air leakage by an average of 4.5 L / min, a 14% reduction, compared to the reference oil.

[0121] Nano-scale mineral molybdenum disulfide has extremely fine particles and a large specific surface area. A large molybdenum disulfide contact surface will have a greater chance of "sulfur-metal" contact with the metal. Molybdenum disulfide molecules combine with the metal and adhere to the metal surface to form an extremely thin molybdenum disulfide solid layer with a thickness of up to 5-16 threads. The components of the present invention can form an oil film. Nano-scale molybdenum disulfide adheres to the surface of the cylinder liner to form a molybdenum film. The molybdenum film and the oil film work together to make the gaps between the friction pairs relatively smaller, which significantly reduces the amount of gas leakage. The generation of gas leakage is mainly due to the existence of the gap, side gap, end gap and back gap of the piston ring, which leads to large mechanical distances and gaps. The dual role of the molybdenum film and the oil film fills the gaps, thereby greatly increasing the mechanical sealing, significantly reducing the blowby of the combustion chamber through the gaps between the cylinder block, piston and piston ring, and the engine gas leakage index has been qualitatively improved.

[0122] Since acidic components or moisture inevitably exist in each component, thereby reducing the strength of the molybdenum film and the oil film, the use of sodium silicate and stearic acid can effectively reduce the impact of acidic components or moisture on the strength of the film layer. Through experimental comparison, it can be found that the use of sodium silicate and stearic acid in the weight proportions of the embodiment greatly reduces the amount of air leakage, which has unexpected technical effects.

[0123] Although the above describes specific embodiments of the present invention, it should be understood by those skilled in the art that these are merely illustrative and that various changes or modifications may be made to these embodiments without departing from the principles and essence of the present invention. Therefore, the scope of protection of the present invention is defined by the appended claims.

Claims

1. A nano-scale mineral molybdenum disulfide lubricating oil, characterized in that: The lubricating oil includes the following components: 100 parts by weight of base oil; 9-12 parts by weight of nano-scale mineral molybdenum disulfide; 0.9-2.4 parts by weight of high-base sulfurized alkylphenol calcium; 1.4-3.4 parts by weight of succinate; 1-2.3 parts by weight of viscosity index improver; 0.9-2.5 parts by weight of pour point depressant; 0.4-1.3 parts by weight of antioxidant; 0.8-2.8 parts by weight of air leakage improving and anti-wear agent; 0.1-2 parts by weight of stearic acid; 0.1-2 parts by weight of sodium silicate; the particle size of the nano-scale mineral molybdenum disulfide is 80-600 nm; the air leakage improving and anti-wear agent is composed of the following substances and parts by weight: 0.6-1.5 parts by weight of aminothioester; 0.3-1.2 parts by weight of ammonium thiophosphate.

2. The nano-scale mineral molybdenum disulfide lubricating oil according to claim 1, characterized in that: The base oil is one of 60N, 150N, 250N, 350N, 400N and 500N or a combination of several of them in any ratio.

3. The nano-scale mineral molybdenum disulfide lubricant according to claim 1, characterized in that: The viscosity index improver is selected from one or more of ethylene-propylene copolymer, styrene-isoprene copolymer, hydrogenated styrene-isoprene block copolymer and polyisobutylene.

4. The nano-scale mineral molybdenum disulfide lubricating oil according to claim 1, characterized in that: The pour point depressant is selected from one or more of a fumarate pour point depressant, an alkyl naphthalene pour point depressant, a polymethacrylate pour point depressant, and a polyolefin pour point depressant.

5. The nano-scale mineral molybdenum disulfide lubricating oil according to claim 1, characterized in that: The antioxidant is selected from one or more of 2,6-di-tert-butylphenol, diisooctyldiphenylamine, N-phenyl-N-sec-butyl-p-phenylenediamine, and 4-octyl-N-(4-octylphenyl)aniline.

6. The nano-scale mineral molybdenum disulfide lubricating oil according to claim 1, characterized in that: The mass ratio of the aminothioester to the thiophosphate amine salt is 1-3:

1.

7. Use of the nano-scale mineral molybdenum disulfide lubricant according to any one of claims 1 to 6 in reducing engine blowby.

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