An ultra-low viscosity gasoline engine oil and its preparation method and application

Abstract

The present invention relates to the field of engine oil for internal combustion engines, and in particular to an ultra-low viscosity gasoline engine oil, a preparation method and an application thereof. It comprises the following components in parts by weight: 6.0 to 9.0 parts of an engine oil compound, 85 to 95 parts of a base oil, 0.2 to 0.5 parts of a pour point depressant, and 0.6 to 0.9 parts of a friction modifier; the friction modifier is a molybdenum dialkyl dithiocarbamate; the base oil comprises two base oils with different 100°C kinematic viscosities and / or viscosity indices: base oil 1 is a high viscosity index Class III + base oil, and base oil 2 is a Class III base oil; and does not contain a viscosity index improver. Simulation tests and engine bench tests have shown that the ultra-low viscosity gasoline engine oil provided by the present invention not only meets the 0W-8 specification requirements in JASO GLV-1, but can also effectively reduce the friction coefficient, improve engine fuel economy, and has excellent anti-wear performance, anti-shear performance and good durability.

Description

Technical Field

[0001] The present invention relates to the technical field of engine oil for internal combustion engines, and in particular to an ultra-low viscosity gasoline engine oil and a preparation method and application thereof. Background Art

[0002] Fuel economy refers to a vehicle's ability to travel economically while minimizing fuel consumption while maintaining power. Expressed as the mass of fuel consumed per unit of power, this is called the fuel consumption rate.

[0003] To promote the continuous improvement of the fuel economy level of passenger cars, the design of passenger cars has gradually tended to be smaller, lighter and more hybrid. Accordingly, small-displacement and hybrid engines have also put forward higher requirements for fuel economy, that is, engine oils are required to have higher energy-saving and anti-wear effects while also having better durability, thereby providing long-term lubrication protection for the engine.

[0004] Engine oil contains a large number of macromolecular substances, which contribute significantly to the kinematic viscosity of gasoline engine oil products. Existing technologies generally use viscosity modifiers and high viscosity index base oil compositions to improve the overall performance of engine oils, effectively reducing viscosity and friction coefficient while maintaining good anti-wear performance, anti-shear performance, and durability, thereby improving engine fuel economy. However, the lowest kinematic viscosity of gasoline engine oil products on the market is currently 6.1 mm 2 / s or above, and gasoline engine oil products with lower kinematic viscosity have not yet appeared. However, the current JASO specifications have proposed ultra-low viscosity oil specifications that meet GLV-1 0W-8. This invention aims to explore the ability of ultra-low viscosity engine oil to improve engine protection and energy-saving performance. Summary of the Invention

[0005] To address the problems of existing gasoline engine oils, the present invention proposes an ultra-low viscosity gasoline engine oil, its preparation method, and its application. The ultra-low viscosity gasoline engine oil provided by the present invention not only has ultra-low viscosity and a low coefficient of friction, effectively improving energy conservation and anti-wear effects, but also maintains excellent anti-wear, anti-shear, and durability properties, thereby providing better fuel economy at a lower cost and durable protection for the engine.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] In a first aspect, the present invention provides an ultra-low viscosity gasoline engine oil, comprising the following components in parts by weight: 6.0 to 9.0 parts of an engine oil compound, 85.0 to 95.0 parts of a base oil, 0.2 to 0.5 parts of a pour point depressant, and 0.6 to 0.9 parts of a friction modifier; the friction modifier is molybdenum dialkyl dithiocarbamate; the base oil comprises two base oils with different 100°C kinematic viscosities and / or viscosity indices: base oil 1 is a high viscosity index Class III+ base oil, and base oil 2 is a Class III base oil; the ultra-low viscosity gasoline engine oil does not contain a viscosity index improver.

[0008] The present invention screens and formulates a large number of optional components of existing engine oils, and finds that when dialkyl dithiocarbamate molybdenum is selected as the friction modifier, the base oil is compounded with a high viscosity index III+ base oil and a Group III base oil (two base oils with specific 100°C kinematic viscosity and viscosity index ranges), and a compounding agent and a pour point depressant are added, the resulting engine oil composition has ultra-low viscosity and a low friction coefficient, which can effectively improve energy saving and anti-wear effects; and the composition also maintains good anti-wear performance, shear resistance and durability, thereby providing better fuel economy at a lower cost and providing durable protection for the engine.

[0009] The engine oil compound described in the present invention is a GLV-1 gasoline engine oil compound; preferably, the engine oil compound is a GLV-1 gasoline engine oil compound containing calcium salicylate and zinc dialkyl dithiophosphate and having a viscosity of 0W-8.

[0010] Preferably, the high viscosity index III+ base oil has a kinematic viscosity of 3.5 mm at 100°C. 2 / s~4.5mm 2 / s, preferably 4.1mm 2 / s~4.3mm 2 / s, more preferably 4.19mm 2 / s, viscosity index is 130-140, preferably 131-135, more preferably 133.

[0011] More preferably, the kinematic viscosity of the Group III base oil at 100°C is 2.5 mm 2 / s~3.5mm 2 / s, preferably 2.8mm 2 / s~3.1mm 2 / s, more preferably 2.93mm 2 / s; viscosity index 120-135, preferably 128-132, more preferably 131.

[0012] The III+ base oil and the gasoline engine oil of the III base oil with the kinematic viscosity and viscosity index at 100° C. preferably used in the system of the present invention have ultra-low viscosity and significantly improved comprehensive performance.

[0013] Preferably, the kinematic viscosity of the ultra-low viscosity engine oil at 100°C is 4.0-6.1 mm 2 / s.

[0014] Preferably, the engine oil compound is an engine oil compound that meets the JASO GLV-1 specification; more preferably, the engine oil compound is a GLV-1 gasoline engine oil compound containing calcium salicylate and zinc dialkyl dithiophosphate and having a viscosity of 0W-8.

[0015] The pour point depressant of the present invention can be selected from those known in the art to further improve the comprehensive performance of the composition.

[0016] Preferably, the ultra-low viscosity gasoline engine oil comprises the following components in parts by weight:

[0017] 65 to 85 parts of Group III + base oil, 5 to 15 parts of Group III base oil, 6 to 9 parts of GLV-1 grade engine oil compound, 0.2 to 0.5 parts of pour point depressant, and 0.6 to 0.9 parts of dialkyl dithiocarbamate molybdenum friction modifier; the gasoline engine oil does not contain a viscosity index improver.

[0018] Further preferably, as the best embodiment of the present invention, the ultra-low viscosity gasoline engine oil comprises the following components in parts by weight:

[0019] The gasoline engine oil contains 80-83 parts of Group III+ base oil, 7-8 parts of Group III base oil, 8-9 parts of GLV-1 grade engine oil additive, 0.3-0.4 parts of pour point depressant, and 0.6-0.7 parts of molybdenum dialkyldithiocarbamate friction modifier. The gasoline engine oil does not contain a viscosity index improver. The ultra-low viscosity gasoline engine oil of the present invention, when used within a specific dosage range, exhibits improved overall performance.

[0020] The present invention discloses an ultra-low viscosity gasoline engine oil without adding a viscosity modifier, which is prepared from the gasoline engine oil compound, base oil, pour point depressant and friction modifier selected in the present invention and meets the technical requirements of JASO GLV-1 0W-8. By optimizing the components and the amounts used, the resulting composition has a good synergistic effect, exhibits excellent fuel economy and friction reduction performance, and has a kinematic viscosity range of 4.0 to 6.1 mm at 100°C. 2 / s; This gasoline engine oil can provide better fuel economy for hybrid engines, has good friction reduction effect, and has passed engine bench tests.

[0021] In its second aspect, the present invention further provides a process (method) for preparing the aforementioned ultra-low viscosity gasoline engine oil without the addition of a viscosity modifier. Specifically, the process comprises preheating the friction modifier, mixing and heating the base oil, engine oil compound, and pour point depressant in appropriate proportions, then adding the preheated friction modifier in appropriate proportions, and stirring the mixture in a heated reactor. By combining specific processes and parameters with the aforementioned engine oil, the present invention significantly improves the performance of the engine oil.

[0022] Further preferably, the friction modifier is preheated at 45°C to 50°C for 0.5 to 1 hour, the base oil, engine oil compound and pour point depressant are added to the blending kettle in a predetermined proportion and the temperature is raised to 55°C to 60°C. After the temperature rises to 50°C, the preheated friction modifier is added to the blending kettle in a predetermined proportion, and the mixture is stirred in the heating reactor at a temperature of 55°C to 60°C for at least 2 hours. The pulse stirring time for large-scale blending is not less than 120 minutes.

[0023] In a third aspect, the present invention further provides the use of the ultra-low viscosity gasoline engine oil in hybrid vehicles. The ultra-low viscosity gasoline engine oil obtained by the method of the present invention has excellent application effects when used in hybrid engines.

[0024] The present invention provides an ultra-low viscosity gasoline engine oil without adding a viscosity modifier. Simulation tests and engine tests have shown that the present invention can improve the fuel saving effect of hybrid engines and has excellent friction reduction and durability. DETAILED DESCRIPTION

[0025] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the specific implementation methods, characteristics and effects of the engine oil proposed according to the present invention are described in detail below in combination with preferred embodiments.

[0026] If specific techniques or conditions are not specified in the examples, the methods were performed according to those described in literature in the field or according to the product specifications. Instruments used, for which the manufacturer is not specified, are conventional products available through regular channels. The methods described are conventional methods unless otherwise specified.

[0027] If no specific techniques or conditions are specified in the examples, the techniques or conditions described in the literature in the field or the product instructions shall be followed.

[0028] Unless otherwise specified, various raw materials used in the following examples of the present invention can be obtained from public commercial channels and conventionally replaced.

[0029] In the following embodiments:

[0030] The engine oil compound is a gasoline engine oil compound that can support the JASO GLV-1 specification (the calcium content of the calcium salicylate detergent in the embodiment is 0.13% to 0.16%, and the alkyl structure of the zinc dialkyl dithiophosphate is secondary) with a viscosity of 0W-8;

[0031] The friction modifier is molybdenum dialkyldithiocarbamate.

[0032] The pour point depressant can be any commonly used pour point depressant in the art. In the embodiment, a mineral oil solution of an acrylate polymer is specifically selected.

[0033] The four-ball anti-wear test is carried out using the SH / T 0189 standard, which was developed in reference to the ASTM D4172 method and is used to determine the anti-wear performance of lubricating oils.

[0034] The LFW ring-block friction and wear test is carried out using the OEM internal standard method, which is used to measure the friction coefficient of materials under different contact conditions. The test results have a good correspondence with the engine energy-saving test bench.

[0035] Verify the energy-saving performance of engine oil solutions by conducting engine fuel economy bench tests.

[0036] In the embodiment of the present invention, the III+ base oil used has a kinematic viscosity of 4.19 mm at 100°C. 2 / s, viscosity index 133; Group III base oil kinematic viscosity at 100°C 2.93mm 2 / s, viscosity index 131.

[0037] Example 1

[0038] This embodiment provides an ultra-low viscosity gasoline engine oil, which is composed of the following components by weight: 82.865% of Group III + base oil, 8% of Group III base oil, 8.2% of GLV-1 grade engine oil compound, 0.3% of pour point depressant, and 0.635% of dialkyl dithiocarbamate molybdenum friction modifier; the engine oil does not contain a viscosity modifier. The ultra-low viscosity engine oil has a kinematic viscosity of 4.94 mm at 100°C. 2 / s.

[0039] The ultra-low viscosity engine oil is prepared as follows:

[0040] During preparation, the friction modifier is preheated at 45°C to 50°C for 0.5 to 1 hour, the base oil, engine oil compound and pour point depressant are added to the blending kettle in a predetermined proportion and the temperature is raised to 55°C to 60°C. After the temperature rises to 50°C, the preheated antioxidant is added to the blending kettle in a predetermined proportion, and the mixture is stirred in the heating reactor at a temperature of 55°C to 60°C for at least 2 hours. The pulse stirring time for large-scale blending is not less than 120 minutes.

[0041] test:

[0042] The obtained ultra-low viscosity gasoline engine oil was subjected to a four-ball anti-wear test under the following conditions: temperature 90° C., speed 1800 rpm, 30 minutes, and load 40 kgf.

[0043] Test results: friction coefficient 0.26.

[0044] Example 2

[0045] test:

[0046] The ultra-low viscosity gasoline engine oil obtained in Example 1 was subjected to a LFW ring-block friction and wear test under the following conditions: temperature 80° C., speed 160 r / min, 30 minutes, and load 294 kgf.

[0047] Test results: friction coefficient 0.034.

[0048] Example 3

[0049] test:

[0050] The ultra-low viscosity gasoline engine oil obtained in Example 1 was subjected to a high-temperature high-shear test at 150°C under the following conditions: temperature 150°C, shear rate 10 6 s -1 .

[0051] Test judgment result: 1.75mpa.s.

[0052] Example 4

[0053] test:

[0054] The ultra-low viscosity gasoline engine oil obtained in Example 1 was subjected to a KRL shear stability test to test the high-temperature high-shear performance at 150° C. after shearing using the CEC L-45-99 method.

[0055] Test judgment result: 1.88mpa.s.

[0056] Comparative Example 1

[0057] This comparative example provides a low-viscosity gasoline engine oil, which is composed of the following components, calculated by weight percentage: 83.7% of Group III + base oil, 10.4% of SP / GF-6 grade engine oil compound, 4.6% of viscosity index improver (PMA type), 0.3% of pour point depressant, and 1.0% of dialkyl dithiocarbamate molybdenum friction modifier.

[0058] The preparation of the gasoline engine oil is as follows:

[0059] During preparation, the friction modifier is preheated at 45°C to 50°C for 0.5 to 1 hour, the base oil, viscosity modifier, engine oil compound and pour point depressant are added to the blending kettle in a predetermined proportion and the temperature is raised to 55°C to 60°C. After the temperature rises to 50°C, the preheated antioxidant is added to the blending kettle in a predetermined proportion, and the mixture is stirred in the heating reactor at a temperature of 55°C to 60°C for at least 2 hours. The pulse stirring time for large-scale blending is not less than 120 minutes.

[0060] test:

[0061] The obtained gasoline engine oil was subjected to a four-ball anti-wear test under the following conditions: temperature 90° C., speed 1800 rpm, 30 minutes, and load 40 kgf.

[0062] Test results: friction coefficient 0.42.

[0063] Comparative Example 2

[0064] test:

[0065] The gasoline engine oil obtained in Comparative Example 1 was subjected to a LFW ring-block friction and wear test under the following conditions: temperature 80° C., speed 160 r / min, 30 minutes, and load 294 kgf.

[0066] Test results: friction coefficient 0.038.

[0067] Comparative Example 3

[0068] test:

[0069] The gasoline engine oil obtained in Comparative Example 1 was subjected to a 150°C high temperature high shear test under the following conditions: temperature 150°C, shear rate 10 6 s-1.

[0070] Test judgment result: 2.3mpa.s.

[0071] Comparative Example 4

[0072] test:

[0073] The gasoline engine oil obtained in Comparative Example 1 was subjected to a KRL shear stability test to test the high temperature and high shear at 150°C after shearing using the CEC L-45-99 method.

[0074] Test judgment result: 2.2mpa.s.

[0075] Test Example 1

[0076] The gasoline engine oils in Example 1 and Comparative Example 1 were subjected to OEM-specified engine fuel economy bench tests. The gasoline engine oil in Comparative Example 1 was used as the reference oil, and the gasoline engine oil in Example 1 was used as the test oil. Back-to-back fuel economy ignition bench tests were conducted.

[0077] The test results show that after the engine bench test, the fuel consumption rate of the gasoline engine oil of Example 1 is 0.7% lower than that of the gasoline engine oil of Comparative Example 1.

[0078] Test Example 2

[0079] The gasoline engine oils in Example 1 and Comparative Example 1 were subjected to the JASO GLV-1 M366 standard engine fuel economy drag test. The gasoline engine oil in Comparative Example 1 was used as the reference oil, and the gasoline engine oil in Example 1 was used as the test oil.

[0080] The test results show that after the engine bench test, the fuel consumption rate of the gasoline engine oil of Example 1 is 1.24% lower than that of the gasoline engine oil of Comparative Example 1.

[0081] In order to further verify the ultra-low viscosity gasoline engine oil obtained by the present invention without adding a viscosity modifier, the inventors further carried out relevant verification experiments. Due to space limitations, only the most representative experimental examples are cited here.

[0082] Although the present invention has been described in detail above using general descriptions and specific embodiments, it will be apparent to those skilled in the art that modifications and improvements may be made based on the present invention. Therefore, such modifications and improvements, which do not depart from the spirit of the present invention, are intended to be within the scope of protection claimed herein.

Claims

1. An ultra-low viscosity gasoline engine oil, characterized in that: The invention is composed of the following components in parts by weight: 80 to 83 parts of high viscosity index Group III + base oil, 7 to 8 parts of Group III base oil, 8 to 9 parts of GLV-1 grade engine oil compound, 0.3 to 0.4 parts of pour point depressant, and 0.6 to 0.7 parts of friction modifier; the friction modifier is molybdenum dialkyl dithiocarbamate; the kinematic viscosity of the high viscosity index Group III + base oil at 100°C is 4.1 mm 2 / s ~4.3 mm 2 / s, and a viscosity index of 131 to 135; the kinematic viscosity of the Group III base oil at 100°C is 2.8 mm 2 / s~3.1 mm 2 / s, and a viscosity index of 128 to 132; the engine oil compound is a GLV-1 gasoline engine oil compound containing calcium salicylate and zinc dialkyl dithiophosphate and having a viscosity of 0W-8; the ultra-low viscosity gasoline engine oil does not contain a viscosity index improver; the kinematic viscosity of the ultra-low viscosity gasoline engine oil at 100°C is 4.0 to 6.1 mm 2 / s.

2. The ultra-low viscosity gasoline engine oil according to claim 1, characterized in that The high viscosity index Group III+ base oil has a kinematic viscosity of 4.19 mm at 100°C. 2 / s, viscosity index is 133.

3. The ultra-low viscosity gasoline engine oil according to claim 2, characterized in that The kinematic viscosity of the Group III base oil at 100°C is 2.93 mm 2 / s; viscosity index is 131.

4. The method for preparing the ultra-low viscosity gasoline engine oil according to any one of claims 1 to 3, characterized in that: The method includes preheating the friction modifier, mixing the base oil, the engine oil compound and the pour point depressant in proportion, heating them, then adding the preheated friction modifier in proportion, and mixing and stirring them in a heating reactor.

5. The method for preparing ultra-low viscosity gasoline engine oil according to claim 4, characterized in that: Preheat the friction modifier at 45℃~50℃ for 0.5~1h, add the base oil, engine oil compound and pour point depressant into the blending kettle according to the established proportion and heat it to 55℃~60℃. After the temperature rises to 50℃, add the preheated friction modifier into the blending kettle according to the established proportion and stir it in the heating reactor at 55℃~60℃ for at least 2h. The pulse stirring time for large-scale blending shall not be less than 120min.

6. Use of the ultra-low viscosity gasoline engine oil according to any one of claims 1 to 3 in hybrid vehicles.