Engine cleaning oil composition and preparation method thereof

Abstract

The engine cleaning oil composition disclosed in the present invention is composed of a metal detergent, an ash-free dispersant, a viscosity index agent, a pour point depressant, an antifoaming agent and a base oil. The present invention also discloses a preparation method of the above-mentioned engine cleaning oil composition. The engine cleaning oil composition has a good cleaning effect, can remove most of the impurities in the internal lubrication system of the engine, and disperse and remove carbon deposits, sludge, etc., to restore a cleaner environment inside the engine, and has good compatibility with high-end lubricating oils, and will not affect the performance of new engine oil. The pour point of the composition is not higher than ‑35°C, the flash point is not lower than 200°C, the evaporation loss is not more than 10.0%, and the base value is 5.0-7.0 mgKOH / g.

Description

Technical Field

[0001] The invention belongs to the technical field of lubricating oils, and in particular relates to an engine cleaning oil composition. The invention also relates to a method for preparing the engine cleaning oil composition. Background Art

[0002] When a car engine is working, the engine oil is long-term affected by high-temperature oxidation, friction pair shear, fuel dilution, wear metal catalysis, mechanical impurities, water mixing and other factors, and gradually deteriorates and ages. Inside the engine lubricating oil system, such as the piston skirt bottom, crankcase bottom shell, oil channel, timing gear cover and other low-temperature places, sludge, gum and other substances harmful to the engine are produced. If the engine is not cleaned for a long time, it will cause poor lubrication and accelerated wear, affecting the normal use of the engine and shortening the engine's service life.

[0003] At present, there are several types of cleaning products and cleaning methods for automobile engines:

[0004] (1) The document “An engine cleaning oil and its preparation method” (application number 201610150235.8, application date 2016.03.16, publication number CN105733774B, publication date 2019-06-18) discloses an engine cleaning oil and its preparation method, which prepares an engine internal cleaning oil by mixing a certain foreign brand of gasoline engine oil compound, pour point depressant, detergent, dispersant, antioxidant, anti-corrosion agent and extreme pressure anti-wear agent in a certain proportion. The oil can disperse and remove impurities such as carbon deposits and sludge inside the engine without disassembly, thereby achieving the effect of maintenance without disassembly. However, during the cleaning process when the engine is idling and running for a short time, there are no requirements for the high-temperature oxidation resistance and extreme pressure performance of the cleaning oil, which results in a waste of some additive resources and leads to many disadvantages such as high cost of the cleaning oil. At the same time, because the traditional engine lubricant formula system is used, the cleaning performance is not particularly enhanced;

[0005] (2) Cleaning agent: This method is to add chemical cleaning agent in a certain proportion before changing the engine oil, run the engine at idle speed for about 30 minutes, drain the old oil, and replace it with new oil. The disadvantage is that the residual chemical cleaning agent may cause corrosion to engine parts and cause a certain decomposition effect on lubricating oil.

[0006] (3) Disassembling the engine for cleaning: This method has the disadvantages of being time-consuming and expensive. Summary of the invention

[0007] The purpose of the present invention is to provide an engine cleaning oil composition, which has the characteristics of short cleaning time, low cost and good compatibility with high-end lubricating oil.

[0008] Another object of the present invention is to provide a method for preparing an engine cleaning oil composition, which has the characteristics of simple process and stable product quality.

[0009] The technical solution adopted by the present invention is that the engine cleaning oil composition is composed of the following components in terms of mass percentage:

[0010] Metal detergent 0.5wt%-1.2wt%, ashless dispersant 0.5wt%-2.0wt%, viscosity index agent 1.0wt%-4.0wt%, pour point depressant 0.1wt%-0.4wt%, antifoaming agent 0.001wt%-0.010wt%, diluent oil 5.0wt%-20.0wt%, and the balance is base oil. The total content of the above components is 100wt%.

[0011] The present invention is also characterized in that:

[0012] The engine cleaning oil composition is composed of the following components in percentage by mass: 0.6wt%-1.0wt% of metal detergent, 1.0wt%-1.8wt% of ashless dispersant, 2.0wt%-4.0wt% of viscosity index agent, 0.1wt%-0.4wt% of pour point depressant, 0.003wt%-0.005wt% of antifoaming agent, 8.0wt%-15.0wt% of diluent oil, and the balance is base oil, and the total content of the above components is 100wt%.

[0013] The metal detergent is any one of calcium alkylbenzene sulfonate, calcium salicylate or calcium sulfide alkylphenate or a combination of two thereof.

[0014] The ashless dispersant is any one of polyisobutylene monosuccinimide and polyisobutylene bissuccinimide or a combination of the two.

[0015] The viscosity modifier is a dispersed olefin copolymer, and in terms of mass percentage, the nitrogen content thereof is not more than 0.1wt%, the ethylene propylene content is 13.0%-14.0wt%, and the chemical chain contains an aromatic amine functional group.

[0016] The pour point depressant is poly-α-olefin, and the base oil is any one or a combination of two hydrogenated base oils whose performance meets the requirements of API II base oil standards.

[0017] The anti-foaming agent is any one of dimethyl silicone oil, alkyl acrylic acid copolymer and alkyl polyamide or a combination of two thereof.

[0018] The diluent oil is kerosene, the acid value of which is not greater than 0.015 KOHmg / g, the carbon and hydrogen in the hydrocarbon composition are not less than 99.5%, and the pressure drop after being placed at 325°C for 2.5 hours is not greater than 3.3 kPa.

[0019] Another technical solution adopted by the present invention is a method for preparing an engine cleaning oil composition, which is specifically implemented according to the following steps:

[0020] Step 1, weigh the following components respectively by mass percentage: 0.5wt%-1.2wt% of metal detergent, 0.5wt%-2.0wt% of ashless dispersant, 1.0wt%-4.0wt% of viscosity index agent, 0.1wt%-0.4wt% of pour point depressant, 0.001wt%-0.010wt% of antifoaming agent, 5.0wt%-20.0wt% of diluent oil, and the balance is base oil. The sum of the contents of the above components should be 100wt%;

[0021] Step 2, add the base oil and diluent oil into a stainless steel or ceramic blending kettle, stir for 1-2 hours while heating to 30-40°C, then add the anti-foaming agent into the blending kettle and continue stirring at constant temperature for 1-2 hours;

[0022] Step 3, add pour point depressant and viscosity index agent into the blending kettle in sequence and continue to stir at constant temperature for 1-2 hours;

[0023] Step 4: Add the ashless dispersant and the metal detergent into the blending kettle in sequence, and continue stirring at 30-40° C. for 3-4 hours until the mixture is uniform, thereby obtaining the engine cleaning oil composition.

[0024] The beneficial effects of the present invention are:

[0025] The engine cleaning oil composition of the present invention has a low pour point, a high flash point and a certain base value, can effectively and quickly clean the sludge, carbon deposits, colloids and various impurities in the engine after long-term use, restore a cleaner use environment inside the engine, and has good compatibility with high-end engine lubricating oils, and will not affect the use performance of new engine oils. The preparation method of the engine cleaning oil composition of the present invention is simple, and the product quality is relatively stable. DETAILED DESCRIPTION

[0026] The present invention is described in detail below through specific implementation modes.

[0027] The engine cleaning oil composition of the present invention is composed of the following components in terms of mass percentage:

[0028] Metal detergent 0.5wt%-1.2wt%, ashless dispersant 0.5wt%-2.0wt%, viscosity index agent 1.0wt%-4.0wt%, pour point depressant 0.1wt%-0.4wt%, antifoaming agent 0.001wt%-0.010wt%, diluent oil 5.0wt%-20.0wt%, and the balance is base oil. The total content of the above components is 100wt%.

[0029] Preferably, the engine cleaning oil composition is composed of the following components in mass percentage: 0.6wt%-1.0wt% of metal detergent, 1.0wt%-1.8wt% of ashless dispersant, 2.0wt%-4.0wt% of viscosity index agent, 0.1wt%-0.4wt% of pour point depressant, 0.003wt%-0.005wt% of antifoaming agent, 8.0wt%-15.0wt% of diluent oil, and the balance is base oil, and the total content of the above components is 100wt%.

[0030] The metal detergent is any one of calcium alkylbenzene sulfonate, calcium salicylate, and calcium sulfide alkylphenol, or a combination of two of them.

[0031] The metal detergent can be any one of alkyl salicylate, alkyl benzene sulfonate or sulphurized alkyl phenol salt or a mixture of two of them; alkyl benzene sulfonate has a higher alkalinity and rust resistance, and is a commonly used additive component for internal combustion engine oil; salicylate is slightly more expensive, but has better high-temperature detergency; sulphurized alkyl phenol salt has a better high-temperature cleaning effect on the top of the engine piston. The present invention does not specifically limit the amount of metal detergent added, which is usually 0.5wt%-1.2wt% of the total mass of the composition. If the value is lower than 0.5wt%, the amount is too little, which will cause the oil product to have a lower cleaning performance, and the alkalinity is low, which cannot eliminate the corrosion caused by the diluent oil. If the value is higher than 1.2wt%, the amount is too much, which will cause a waste of additives and affect the role of other functional additives.

[0032] The ashless dispersant is any one of polyisobutylene monosuccinimide and polyisobutylene bissuccinimide or a combination of the two.

[0033] The ashless dispersant can be one or both of polyisobutylene monosuccinimide and polyisobutylene bissuccinimide. Ashless dispersant is a surfactant, which is mainly used to disperse pollutants generated in the engine to ensure that the oil can flow freely. The dispersibility of ashless dispersant can help keep the engine clean, and in some cases, it helps to maintain the cleanliness of the piston. Different types of dispersants have different dispersing effects on sludge and sediments. Generally, dispersants with molecular weights have better dispersing effects on sludge generated at low temperatures. The present invention does not make any special restrictions on the amount of ashless dispersant added, which is usually 0.5wt%-2.0wt% of the total mass of the composition. If the value is less than 0.5wt%, the amount is too little, which will cause the oil dispersion performance to decrease, and the cleaning effect of the surface sediments of the engine parts and the sludge in the oil pan is not good. If the value is higher than 2.0wt%, the amount is too much, which will cause a waste of additives.

[0034] The viscosity modifier is a dispersed olefin copolymer, and in terms of mass percentage, the nitrogen content thereof is not more than 0.1wt%, the ethylene propylene content is 13.0%-14.0wt%, and the chemical chain contains an aromatic amine functional group.

[0035] The viscosity index agent mainly enhances the performance of dispersion and cleaning. Because the chemical chain contains aromatic amine functional groups, it can effectively wrap and disperse the soot particles in the engine oil. It has excellent synergistic effects when compounded with cleaning and dispersing agents in a specific ratio, and can improve the overall cleaning and dispersing performance of the cleaning oil. The amount of viscosity index agent added in the present invention is usually 1.0wt%-4.0wt% of the total mass of the composition. If the value is lower than 1.0wt%, the amount is too small, which will result in poor soot and sludge cleaning and dispersing effects. If the value is higher than 4.0wt%, the amount is too much, which will cause a waste of additives, increase the viscosity of the oil, and result in a decrease in low-temperature performance, and no other beneficial effects.

[0036] The pour point depressant is poly-α-olefin. The addition of the pour point depressant can reduce the pour point of the composition and improve the use effect of the oil product in a low temperature environment. The present invention does not specifically limit the amount of the pour point depressant, which is usually 0.1wt%-0.4wt% of the total mass of the composition. If the value is less than 0.1wt%, the amount is too small, which will cause the pour point to be too high and affect the fluidity in a low temperature environment. If the value is higher than 0.4wt%, the amount is too large, which will cause a waste of additives and have no other beneficial effects.

[0037] The anti-foaming agent is any one of dimethyl silicone oil, alkyl acrylic acid copolymer and alkyl polyamide or a combination of two thereof.

[0038] The antifoaming agent can be dimethyl silicone oil or alkyl acrylic acid copolymer or alkyl polyamide or a combination of any two of the above. The antifoaming agent can reduce the phenomenon of foaming of the cleaning oil due to mechanical stirring during actual use, and avoid the problem of poor cleaning effect caused by the generation of a large amount of foam during use. The amount of the antifoaming agent added in the present invention is not particularly limited, and is usually 0.001wt%-0.010wt% of the total mass of the composition. If the value is lower than 0.001wt%, the amount is too little, which will cause the antifoaming property to decrease. If the value is higher than 0.010wt%, the amount is too much, which will result in a waste of additives and no other beneficial effects.

[0039] The diluent oil is a kerosene with an acid value of no more than 0.015 KOHmg / g, a hydrocarbon composition of carbon and hydrogen of no less than 99.5%, and a pressure drop of no more than 3.3 kPa after being placed at 325°C for 2.5 hours.

[0040] The diluent oil is a special kerosene, which plays a role in enhancing the dissolution of impurities in the engine by the cleaning oil, and is characterized by an acid value of no more than 0.015KOHmg / g, a carbon and hydrogen content of no less than 99.5% in the hydrocarbon composition, and a pressure drop of no more than 3.3kPa at 325°C for 2.5 hours. The amount of the diluent oil added in the present invention is usually 5.0-20.0% of the total mass of the composition. If the value is less than 5.0%, the amount is too little, and the cleaning effect on the engine lubrication system is poor. If the value is higher than 20.0%, the amount is too much, which will cause corrosion to the engine and bring about safety problems in use.

[0041] The base oil is any one or two hydrogenated base oil compositions whose performance meets the requirements of API Class II base oil standards. The base oil involved in the composition of the present invention can be one or two hydrogenated base oil compositions whose performance meets the requirements of API Class II base oil standards. The present invention does not specifically limit the amount of base oil added, which is approximately 72.8-88.4% of the total mass of the composition. If the value is lower than 72.8%, the amount used is too small, which will increase the amount of additives and increase the cost. If the value is higher than 88.4%, the amount used is too large, which will reduce the amount of functional additives, fail to give the oil the proper cleaning effect, and have no other beneficial effects.

[0042] The present invention provides a method for preparing the above engine cleaning oil composition, which is specifically implemented according to the following steps:

[0043] Step 1, weigh the following components respectively by mass percentage: 0.5wt%-1.2wt% of metal detergent, 0.5wt%-2.0wt% of ashless dispersant, 1.0wt%-4.0wt% of viscosity index agent, 0.1wt%-0.4wt% of pour point depressant, 0.001wt%-0.010wt% of antifoaming agent, 5.0wt%-20.0wt% of diluent oil, and the balance is base oil. The sum of the contents of the above components should be 100wt%;

[0044] Step 2, add the base oil and diluent oil into a stainless steel or ceramic blending kettle, stir for 1-2 hours while heating to 30-40°C, then add the anti-foaming agent into the blending kettle and continue stirring at constant temperature for 1-2 hours;

[0045] Step 3, add pour point depressant and viscosity index agent into the blending kettle in sequence and continue to stir at constant temperature for 1-2 hours;

[0046] Step 4: Add the ashless dispersant and the metal detergent into the blending kettle in sequence, and continue stirring at 30-40° C. for 3-4 hours until the mixture is uniform, thereby obtaining the engine cleaning oil composition.

[0047] The engine cleaning oil composition provided by the invention has a pour point of no higher than -35°C, a flash point of no lower than 200°C, an evaporation loss of no more than 10.0%, and a base value of 5.0-7.0 mgKOH / g based on the total mass of the composition.

[0048] The pour point is not higher than -35℃ in order to avoid the problem of poor fluidity of the finished product in winter in cold areas. The flash point is not lower than 200℃ because cleaning substances contain some relatively volatile components. If the flash point is too low, they may evaporate during storage due to improper storage, causing some safety problems. The evaporation loss is not more than 10.0% to ensure product safety and relative stability of effective components. The alkalinity value of 5.0-7.0mgKOH / g has better cleaning performance. Pollutants attached to the internal surface of the engine can be dissolved by using alkaline substances or substances with active groups.

[0049] The composition does not contain antioxidants, anti-wear agents and friction reducers. Usually, some metal salts have sulfate ash. If the antioxidants are added in an inappropriate amount or used improperly, it may cause an increase in deposits on the metal surface of the engine.

[0050] The present invention solves the corrosion effect caused by using diluent oil to enhance the cleaning effect and solves the performance deficiency of using traditional engine oil in soot dispersion by systematically screening various types of metal detergents, ashless dispersants, dispersant viscosity modifiers and diluent oils in lubricating oils and experimentally studying the interactions and relationships among the components.

[0051] In order to ensure that the performance of the inventive composition achieves the purpose of the invention, the oil has excellent cleaning properties, a certain alkalinity value, a higher flash point and a lower pour point, good compatibility with traditional engine lubricants, and will not affect the performance of engine lubricants, the present invention, based on the mechanism of action of additives, uses a variety of simulation test methods to screen and optimize the performance of different types of additives and additives of the same type but different compositions. Through laboratory simulation tests and vehicle cleaning tests, the corrosion effect caused by improving the cleaning performance is solved, and the purpose of good compatibility between cleaning oil and engine lubricants is achieved. Compared with commercially available cleaning oils, the composition of the present invention has higher viscosity and lower pour point, and shows better cleaning effect in simulation tests.

[0052] The composition of the present invention has an excellent cleaning effect, can remove most of the impurities inside the engine lubrication system, restore a relatively clean use environment inside the engine, and has good compatibility with high-end engine lubricating oils, and will not affect the use performance of new engine oils. In laboratory simulations and vehicle cleaning tests, compared with commercially available cleaning oils, the composition exhibits a better cleaning effect, has a higher viscosity and a lower pour point, and achieves the purpose of good compatibility between the cleaning oil and the engine lubricating oil.

[0053] The effects of the present invention are further illustrated by the following examples.

[0054] In order to screen the base oil and additive components, the present invention adopts the aluminum plate immersion test after the coke plate test in the laboratory to simulate the cleaning effect of the cleaning oil on sludge and colloid. The simulation test conditions are: put the aluminum plate containing coke in the test cleaning oil, stir it with a magnetic stirrer for 2 hours at a sealed temperature of 30°C, and measure the change in the coke weight of the aluminum plate. In order to actually evaluate the use effect of the cleaning oil, a passenger car with a mileage of more than 100,000 kilometers is selected, the engine oil is drained in the hot engine state, the cleaning oil is added and the engine is run at idle speed for 20 minutes before draining, and the cleaning is repeated twice, the appearance change of the oil released from the engine is observed, and the change in the base value of the engine oil after the new engine oil is added is detected to judge the cleaning effect of the cleaning oil and its compatibility with the engine oil.

[0055] Embodiment 1:

[0056] Taking the production of 100 kg of the product of the present invention as an example, the raw materials and their mass ratios are as follows:

[0057] Calcium alkylbenzene sulfonate with a base value of 390-430 mgKOH / g 1.0Kg

[0058] Polyisobutylene monosuccinimide 1.8Kg

[0059] Dispersed olefin copolymer 2.5Kg

[0060] Polyolefin pour point depressant 0.3Kg

[0061] Dimethyl silicone oil anti-foaming agent 0.005Kg

[0062] Kerosene 15.0Kg

[0063] 74.895 kg of an API II hydrogenated base oil mixture.

[0064] Embodiment 2:

[0065] Taking the production of 100 kg of the product of the present invention as an example, the raw materials and their mass ratios are as follows:

[0066] Calcium salicylate with a base value of 260-300 1.2Kg

[0067] Polyisobutylene monosuccinimide 2.0Kg

[0068] Dispersed olefin copolymer 3.5Kg

[0069] Polyolefin pour point depressant 0.3Kg

[0070] Dimethyl silicone oil anti-foaming agent 0.005Kg

[0071] Kerosene 10.0Kg

[0072] An API II hydrogenated base oil mixture 82.995Kg

[0073] Embodiment 3:

[0074] Taking the production of 100 kg of the product of the present invention as an example, the raw materials and their mass ratios are as follows:

[0075] The calcium salicylate with a base value of 260-300 in the above Example 2 is replaced by calcium sulfonate with a base value of 390-430, and the other components are of the same quality.

[0076] Embodiment 4:

[0077] Taking the production of 100 kg of the product of the present invention as an example, the following raw materials are weighed respectively:

[0078] Calcium alkylbenzene sulfonate with a base value of 390-430 mgKOH / g 1.0Kg

[0079] Polyisobutylene monosuccinimide 1.8Kg

[0080] Dispersed olefin copolymer 2.5Kg

[0081] Polyolefin pour point depressant 0.3Kg

[0082] Dimethyl silicone oil anti-foaming agent 0.005Kg

[0083] Kerosene 15.0Kg

[0084] 74.895 kg of an API II hydrogenated base oil mixture.

[0085] Add API II hydrogenated base oil mixture and kerosene into a stainless steel blending kettle, stir for 2 hours while heating to 35°C, then add dimethyl silicone oil antifoaming agent into the blending kettle and continue stirring at constant temperature for 2 hours;

[0086] Step 3, adding the poly-alpha olefin pour point depressant and the dispersed olefin copolymer into the blending kettle in sequence and continuing to stir at a constant temperature for 1.5 hours;

[0087] Step 4: Add polyisobutylene monosuccinimide and calcium alkylbenzene sulfonate into the blending kettle in sequence, and continue stirring at 35° C. for 3.5 hours until the mixture is uniform, thereby obtaining an engine cleaning oil composition.

[0088] To verify the effect of the present invention, the inventors used the cleaning oil prepared in the embodiment of the present invention to conduct laboratory simulation performance evaluation and real vehicle cleaning tests. The test results are shown in Table 1:

[0089] Table 1 Evaluation results of the simulated performance of the cleaning oil composition of the present invention

[0090]

[0091] It can be seen from the data in Table 1 that, compared with commercially available products, the composition of the present invention has higher viscosity and lower pour point, and exhibits better sludge dispersibility and detergency in the SDT sludge dispersibility and aluminum plate immersion simulation tests. In the actual vehicle cleaning experiment, the base value of the engine oil changes less after the test, and the compatibility with the engine oil is better.

Claims

1. An engine cleaning oil composition, characterized in that: The components are as follows according to mass percentage: Metal detergent 0.6wt%-1.0wt%, ashless dispersant 1.0wt%-1.8wt%, viscosity index agent 2.0wt%-4.0wt%, pour point depressant 0.1wt%-0.4wt%, antifoaming agent 0.003wt%-0.005wt%, diluent oil 8.0wt%-15.0wt%, the balance is base oil, the sum of the above components is 100wt%; The viscosity modifier is a dispersed olefin copolymer, and in terms of mass percentage, its nitrogen content is no more than 0.1wt%, its ethylene propylene content is 13.0wt%-14.0wt%, and its chemical chain contains aromatic amine functional groups; The diluent oil is kerosene, the acid value of which is not greater than 0.015 KOHmg / g, the carbon and hydrogen content of the hydrocarbon composition is not less than 99.5%, and the pressure drop after being placed at 325°C for 2.5 hours is not greater than 3.3 kPa; The metal detergent is any one or a combination of two of calcium alkylbenzene sulfonate, calcium salicylate or calcium sulfide alkylphenol; The ashless dispersant is any one of polyisobutylene monosuccinimide or polyisobutylene bissuccinimide or a combination of the two; The pour point depressant is poly-α-olefin, and the base oil is any one or a combination of two hydrogenated base oils whose performance meets the requirements of API Class II base oil standards; The anti-foaming agent is any one of dimethyl silicone oil, alkyl acrylic acid copolymer and alkyl polyamide, or a combination of two thereof.

2. The method for preparing the engine cleaning oil composition according to claim 1, characterized in that: Please follow the steps below to implement: Step 1, weigh the following components respectively by mass percentage: metal detergent 0.6wt%-1.0wt%, ashless dispersant 1.0wt%-1.8wt%, viscosity index agent 2.0wt%-4.0wt%, pour point depressant 0.1wt%-0.4wt%, antifoaming agent 0.003wt%-0.005wt%, diluent oil 8.0wt%-15.0wt%, the balance is base oil, and the sum of the contents of the above components should be 100wt%; Step 2, add the base oil and diluent oil into a stainless steel or ceramic blending kettle, stir for 1-2 hours while heating to 30-40°C, then add the anti-foaming agent into the blending kettle and continue stirring at constant temperature for 1-2 hours; Step 3, add pour point depressant and viscosity index agent into the blending kettle in sequence and continue to stir at constant temperature for 1-2 hours; Step 4: Add the ashless dispersant and the metal detergent into the blending kettle in sequence, and continue stirring at 30-40° C. for 3-4 hours until the mixture is uniform, thereby obtaining the engine cleaning oil composition.

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