A turbocharger engine protector and method of making same

Abstract

The application belongs to the technical field of protective agents, and particularly relates to a turbocharged engine protective agent and a preparation method thereof. The turbocharged engine protective agent comprises the following raw materials in parts by mass: base oil 85-90 parts, graphite powder 5-8 parts, dialkyldithiophosphoric acid oxymolybdenum 0.5-2 parts, auxiliary agent 3-5 parts, dispersing agent 4-6 parts, antioxidant 1-2 parts and thickening agent 2-4 parts. The turbocharged engine protective agent provided by the application can improve the maximum seizure-free load and the maximum sintering load of engine oil lubricating oil, improve the wear resistance, and has high stability.

Description

Technical Field

[0001] This invention belongs to the field of protective agent technology, specifically relating to a turbocharged engine protective agent and its preparation method. Background Technology

[0002] As the core power unit of a car, the engine's performance and lifespan directly determine the vehicle's reliability and economy. With the rapid development of the modern automotive industry, especially the widespread application of turbocharging technology, engines operate for significantly longer periods under high speed, high load, and high temperature conditions, leading to more stringent lubrication challenges for their internal friction pairs. During long-term engine operation, friction and wear between metal surfaces are inevitable. This not only results in decreased mechanical efficiency and increased fuel consumption but also accelerates the aging of critical components, ultimately causing engine performance degradation or even engine failure.

[0003] Currently, the industry commonly uses the method of adding protective agents to base engine oils to improve their anti-wear and friction-reducing properties. These additives typically include anti-wear agents (such as ZDDP), extreme pressure additives, friction modifiers, and detergent-dispersants. However, as engine technology continues to develop towards higher power density and higher heat load, the performance of traditional additive systems under extreme operating conditions has gradually reached its limit, making it difficult to meet the higher requirements of modern turbocharged engines for lubrication protection.

[0004] Especially in assessing key indicators of lubricant's extreme pressure performance and anti-wear capabilities, existing commercially available engine protectants still have significant shortcomings. Among these, the maximum non-seize load (PB value) is a crucial parameter for measuring a lubricant's ability to resist metal-to-metal seizing under extreme pressure conditions in a four-ball friction test. A higher PB value means the lubricating film can maintain its integrity under high loads, effectively preventing direct metal-to-metal contact. However, most currently available engine protectants offer limited improvements in PB value, making them prone to oil film rupture under the frequent instantaneous high-load conditions encountered by turbocharged engines, leading to micropitting or scratches.

[0005] Another key indicator is the sintering point (PD value, i.e., maximum sintering load), which reflects the lubricant's ability to prevent the friction pair surfaces from fusion welding under extreme high temperature and pressure conditions. When the load exceeds the PD value, instantaneous sintering occurs on the steel ball surface, causing catastrophic wear. For turbocharged engines, the high exhaust temperature makes it easy for hot spots to form locally, placing even higher demands on the lubricant's PD value. However, existing products generally have low PD values, making it difficult to provide sufficient safety assurance.

[0006] Furthermore, the wear mark diameter, as a direct indicator of the anti-wear performance of a lubricant, reflects the size of the wear marks on the surface of the friction pair under certain load and operating conditions. A smaller wear mark diameter means better anti-wear protection. However, the wear mark diameters obtained by most commercially available engine protectants under standard test conditions (such as SH / T 0189) are still relatively large, indicating that their friction-reducing and anti-wear performance during continuous friction needs to be improved, and they cannot effectively cope with the cumulative wear problem caused by the long-term high-load operation of turbocharged engines.

[0007] Therefore, there is an urgent need to develop a new type of turbocharged engine protectant that can significantly improve the aforementioned key lubrication performance indicators. Summary of the Invention

[0008] The purpose of this invention is to provide a turbocharged engine protective agent and its preparation method.

[0009] To achieve the above objectives, the present invention provides the following technical solution:

[0010] A turbocharged engine protectant comprises the following raw materials in parts by weight: 85-90 parts base oil, 5-8 parts graphite powder, 0.5-2 parts dialkyl dithiophosphate molybdenum oxide, 3-5 parts additives, 4-6 parts dispersant, 1-2 parts antioxidant, and 2-4 parts thickener.

[0011] Preferably, the particle size of the graphite powder is 150-500 μm.

[0012] Preferably, the preparation method of the additive includes the following steps: adding graphene oxide to deionized water, stirring evenly to obtain a mixture, continuing to add long-chain alkylamine and dicyclohexylcarbodiimide, heating under reflux reaction, washing after the reaction is completed, and vacuum drying to obtain the additive.

[0013] Graphene oxide, when added as an additive to protective agents, often exhibits unsatisfactory performance due to its tendency to agglomerate. This invention modifies graphene oxide using long-chain alkylamines, allowing it to synergistically interact with other components to increase the maximum non-seize load of the protective agent while simultaneously improving its wear resistance. Analysis shows that the modified graphene oxide exhibits higher dispersibility, ensuring smooth transport of GO monolayer sheets to the contact area. The modified GO also spreads more uniformly and densely on the metal surface, forming a robust protective film.

[0014] Preferably, the mass ratio of graphene oxide, long-chain alkylamine and dicyclohexylcarbodiimide is 2:(0.4-0.7):(0.1-0.2).

[0015] Preferably, the long-chain alkylamine comprises dodecylamine, tetradecylamine and hexadecylamine in a mass ratio of (0.2-0.5):1:(1.3-1.6).

[0016] Traditionally, it is believed that longer alkyl chains (such as octadecylamine C18) provide better steric hindrance and oil solubility. However, this invention uses specific ratios of dodecylamine, tetradecylamine, and hexadecylamine to modify graphite oxide, which can better improve the maximum sintering load (P). D Analysis shows that by blending in appropriate proportions, a more suitable grafting density can be formed, allowing for denser grafting onto the GO surface and generating a stronger entropy repulsion force (steric hindrance). At the same time, the mixed grafting of alkylamines with different chain lengths disrupts the regularity and ordered arrangement of the molecular chains, which enables the modified GO to maintain excellent solubility and flowability in base oils, thereby achieving a more stable and durable dispersion.

[0017] Preferably, the graphene oxide is a single-layer graphene oxide powder with a particle size of 8-15 μm.

[0018] Experiments revealed that using monolayer graphene oxide with a specific particle size to prepare the additive can reduce the diameter of friction marks. Analysis suggests that this particle size allows for better synergistic effects with other components, forming a dense and robust adsorption film on the substrate surface, thereby improving lubrication performance and reducing friction and wear. If the particle size is too large, it cannot effectively penetrate and cover the contact area; if it is too small, it is easily carried away by the oil flow, thus reducing its effective concentration.

[0019] Preferably, the dispersant comprises Tween 60, polyisobutylene succinimide, and sodium dodecylbenzenesulfonate in a mass ratio of 1:(0.5-0.7):(1.4-1.6).

[0020] API SN 0W-30 All-Purpose Engine Oil is a lubricant from Guangdong Lingzan Lubricating Oil Technology Co., Ltd., suitable for high-performance turbocharged engines. However, the stability of the protective agents added to this lubricant in existing technologies is not ideal. This invention uses a protective agent prepared with a specific ratio of dispersant, which can improve the stability of this lubricant.

[0021] Preferably, the antioxidant is a zinc thiophosphate dioctyl alkyl salt.

[0022] Preferably, the thickener is either an ethylene-propylene copolymer or a hydrogenated styrene diene copolymer.

[0023] The present invention provides a method for preparing the turbocharged engine protectant, comprising the following steps: heating the base oil, adding a thickener, stirring evenly, cooling down and then adding graphite powder and additives to mix and stir evenly; adding the remaining components and stirring evenly to obtain the turbocharged engine protectant.

[0024] Compared with the prior art, the advantages and beneficial effects of the present invention are as follows:

[0025] 1. This invention provides a turbocharged engine protectant that uses long-chain alkylamines to modify graphene oxide, which works synergistically with other components to increase the maximum non-seize load of the protectant and improve its anti-wear properties.

[0026] 2. In this invention, when dodecylamine, tetradecylamine, and hexadecylamine are used in specific proportions to modify graphite oxide, the maximum sintering load (P) can be improved more effectively. D ).

[0027] 3. The present invention uses monolayer graphene oxide of a specific particle size to prepare an additive, which can reduce the diameter of the friction spot.

[0028] 4. API SN 0W-30 All-Round Engine Oil is a lubricant from Guangdong Lingzan Lubricating Oil Technology Co., Ltd., suitable for high-performance turbocharged engines. This invention uses a specific ratio of dispersant to improve the stability of the product after the addition of protective agents. Attached Figure Description

[0029] Figure 1 The image shows a test report of the protective agent prepared in Example 1.

[0030] Figure 2 The image shows the test results of the protective agent prepared in Example 1. Detailed Implementation

[0031] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] All raw materials used in the following embodiments of the present invention are commercially available products:

[0033] The graphite powder has a particle size of 150-500μm. Model: XLC30, manufactured by Shanghai Xili Carbon Co., Ltd.

[0034] The antioxidant is selected from T203 thiophosphoric dioctyl alkyl zinc salt. (Wuhan Jiyesheng Chemical Co., Ltd.)

[0035] The thickener is a hydrogenated styrene diene copolymer. Jinzhou Kangtai Lubricating Oil Additives Co., Ltd., model BD6618L.

[0036] The base oil is selected from 500N base oil. Changzhou Heshili Chemical Co., Ltd., kinematic viscosity (40℃), 110 mm. 2 / s.

[0037] Dialkyl dithiophosphate molybdenum oxide, Wuhan Jiyesheng Chemical Co., Ltd.

[0038] Polyisobutylene succinimide, McLean, item number D909506.

[0039] Example 1

[0040] This embodiment provides a turbocharged engine protectant, comprising the following raw materials in parts by weight: 87 parts base oil, 7 parts graphite powder, 2 parts molybdenum dialkyl dithiophosphate, 4 parts additives, 5 parts dispersant, 1.5 parts antioxidant, and 3 parts thickener. The dispersant comprises Tween 60, polyisobutylene succinimide, and sodium dodecylbenzenesulfonate in a mass ratio of 1:0.6:1.5.

[0041] The preparation method of the additive includes the following steps: 2g of graphene oxide is added to 800 mL of deionized water. The graphene oxide is a single-layer graphene oxide powder with a particle size of 8-15μm (Chengdu Jiacai Technology Co., Ltd.). The mixture is stirred evenly to obtain a mixed solution. Then, 0.5g of long-chain alkylamine and 0.15g of dicyclohexylcarbodiimide are added. The long-chain alkylamine includes dodecylamine, tetradecylamine and hexadecylamine in a mass ratio of 0.3:1:1.5. The mixture is stirred and heated under reflux at 300rpm at 120℃ for 14h. After the reaction is completed, the product is washed four times with ethanol and deionized water, and then dried under vacuum at 60℃ to obtain the additive.

[0042] The preparation method of the turbocharged engine protectant includes the following steps: heating the base oil to 100°C, adding the thickener, stirring at 300 rpm for 10 min, cooling to 55°C, continuing to add graphite powder and additives and mixing, stirring at 300 rpm for 35 min; adding the remaining components, stirring at 75°C and 300 rpm for 45 min to obtain the turbocharged engine protectant.

[0043] Example 2

[0044] This embodiment provides a turbocharged engine protectant, comprising the following raw materials in parts by weight: 85 parts base oil, 8 parts graphite powder, 1 part molybdenum dialkyl dithiophosphate, 5 parts additives, 4 parts dispersant, 2 parts antioxidant, and 2 parts thickener. The dispersant comprises Tween 60, polyisobutylene succinimide, and sodium dodecylbenzenesulfonate in a mass ratio of 1:0.5:1.6.

[0045] The preparation method of the additive includes the following steps: 2g of graphene oxide is added to 800 mL of deionized water. The graphene oxide is a single-layer graphene oxide powder with a particle size of 8-15μm (Chengdu Jiacai Technology Co., Ltd.). The mixture is stirred evenly to obtain a mixed solution. 0.4g of long-chain alkylamine and 0.2g of dicyclohexylcarbodiimide are then added. The long-chain alkylamine includes dodecylamine, tetradecylamine and hexadecylamine in a mass ratio of 0.2:1:1.6. The mixture is stirred and heated under reflux at 200rpm at 120℃ for 15h. After the reaction is completed, the product is washed four times with ethanol and deionized water, and then dried under vacuum at 60℃ to obtain the additive.

[0046] The preparation method of the turbocharged engine protectant includes the following steps: heating the base oil to 100°C, adding the thickener, stirring at 300 rpm for 10 min, cooling to 55°C, continuing to add graphite powder and additives and mixing, stirring at 300 rpm for 35 min; adding the remaining components, stirring at 75°C and 300 rpm for 45 min to obtain the turbocharged engine protectant.

[0047] Example 3

[0048] This embodiment provides a turbocharged engine protectant, comprising the following raw materials in parts by weight: 90 parts base oil, 5 parts graphite powder, 2 parts molybdenum dialkyl dithiophosphate, 3 parts additives, 6 parts dispersant, 1 part antioxidant, and 4 parts thickener. The dispersant comprises Tween 60, polyisobutylene succinimide, and sodium dodecylbenzenesulfonate in a mass ratio of 1:0.7:1.4.

[0049] The preparation method of the additive includes the following steps: 2g of graphene oxide is added to 800 mL of deionized water. The graphene oxide is a single-layer graphene oxide powder with a particle size of 8-15μm (Chengdu Jiacai Technology Co., Ltd.). The mixture is stirred evenly to obtain a mixed solution. 0.7g of long-chain alkylamine and 0.1g of dicyclohexylcarbodiimide are then added. The long-chain alkylamine includes dodecylamine, tetradecylamine and hexadecylamine in a mass ratio of 0.5:1:1.3. The mixture is stirred and heated under reflux at 120℃ and 300rpm for 12h. After the reaction is completed, the product is washed four times with ethanol and deionized water, and then dried under vacuum at 60℃ to obtain the additive.

[0050] The preparation method of the turbocharged engine protectant includes the following steps: heating the base oil to 100°C, adding the thickener, stirring at 300 rpm for 10 min, cooling to 55°C, continuing to add graphite powder and additives and mixing, stirring at 300 rpm for 35 min; adding the remaining components, stirring at 75°C and 300 rpm for 45 min to obtain the turbocharged engine protectant.

[0051] Comparative Example 1

[0052] The difference between this comparative example and Example 1 is that the total amount of graphite powder, dialkyl dithiophosphate molybdenum oxide, and additives remains the same, but the ratio is changed.

[0053] A turbocharged engine protectant comprises the following raw materials in parts by weight: 87 parts base oil, 9 parts graphite powder, 3 parts dialkyl dithiophosphate molybdenum oxide, 1 part additive, 5 parts dispersant, 1.5 parts antioxidant, and 3 parts thickener.

[0054] Comparative Example 2

[0055] The difference between this comparative example and Example 1 is that the long-chain alkylamine is replaced with octadecylamine.

[0056] Comparative Example 3

[0057] The difference between this comparative example and Example 1 is that the long-chain alkylamine includes dodecylamine, tetradecylamine and hexadecylamine in a mass ratio of 1:1:1.

[0058] Comparative Example 4

[0059] The difference between this comparative example and Example 1 is that the graphene oxide used is a single-layer graphene oxide powder with a particle size of 1-5 μm. Chengdu Jiacai Technology Co., Ltd.

[0060] Comparative Example 5

[0061] The difference between this comparative example and Example 1 is that the graphene oxide used is a single-layer graphene oxide powder with a particle size of 50-100 μm. Chengdu Jiacai Technology Co., Ltd.

[0062] Comparative Example 6

[0063] The difference between this comparative example and Example 1 is that the dispersant includes Tween 60, polyisobutylene succinimide, and sodium dodecylbenzenesulfonate in a mass ratio of 1:0.4:1.7.

[0064] Comparative Example 7

[0065] The difference between this comparative example and Example 1 is that the dispersant includes Tween 60, polyisobutylene succinimide, and sodium dodecylbenzenesulfonate in a mass ratio of 1:0.3:1.3.

[0066] Comparative Example 8

[0067] The difference between this comparative example and Example 1 is that the dispersant includes Tween 60, succinimide, and sodium dodecylbenzenesulfonate in a mass ratio of 1:0.6:1.5.

[0068] Comparative Example 9

[0069] The difference between this comparative example and Example 1 is that the product of Example 1 in Patent CN 118931624 B, "An Engine Lubricant and Protective Agent Containing Flake Graphite and Its Preparation Method Thereof".

[0070] Performance testing

[0071] The lubricating protectants prepared in Examples 1-3 and Comparative Examples 1-9 were added at a rate of 5 wt% to API SN 0W-30 full-strength engine oil (viscosity: 0W-30, grade: SN, Guangdong Lingzan Lubricating Oil Technology Co., Ltd.) and stirred evenly before their performance was tested.

[0072] 1. Determine the maximum non-bite load (P) according to GB / T 12583-1998. B ) and sintering point (maximum sintering load (P) D )).

[0073] 2. Friction mark diameter: Four-ball friction and wear test was conducted according to SH / T 0189-2017. Test conditions: rotation speed 1200 rpm, load 392 N, temperature 75℃, friction time 2 h. Three measurements were taken, and the average value was recorded.

[0074] 3. Temperature stability: Store 100mL of lubricating oil at 4℃, 25℃, and 40℃ for 3 days as one cycle, for a total of 60 days. After returning to room temperature, observe whether there is obvious stratification and precipitation.

[0075] The results are shown in Table 1.

[0076] Table 1 Performance Test Results

[0077]

[0078] From Table 1 and Figure 1 , 2 It can be seen that P in Examples 1-3 B and P D It has high value, small wear scar diameter, and high stability.

[0079] In Comparative Example 1, the ratio of graphite powder, molybdenum dialkyl dithiophosphate, and additives was changed, and P... D The value and wear resistance decrease.

[0080] In Comparative Examples 2 and 3, the composition and ratio of long-chain alkylamines were changed, and P B decline.

[0081] In Comparative Examples 4 and 5, the particle size of graphene oxide changed, and the diameter of the wear scars increased.

[0082] The stability decreased when the composition and ratio of the dispersant in Comparative Examples 6-8 were changed.

[0083] Comparative Example 9, a protective agent of the prior art, shows that it has very poor stability in API SN 0W-30 full blend engine oil.

[0084] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A turbocharger engine protector characterized in that, The raw materials include the following parts by weight: 85-90 parts base oil, 5-8 parts graphite powder, 0.5-2 parts molybdenum dialkyl dithiophosphate, 3-5 parts additives, 4-6 parts dispersant, 1-2 parts antioxidant and 2-4 parts thickener; The preparation method of the additive includes: adding graphene oxide to deionized water to obtain a mixture, adding long-chain alkylamine and dicyclohexylcarbodiimide, heating and refluxing to react, washing after the reaction is completed, and vacuum drying to obtain the additive; The mass ratio of graphene oxide, long-chain alkylamine, and dicyclohexylcarbodiimide is 2:(0.4-0.7):(0.1-0.2). The long-chain alkylamines are dodecylamine, tetradecylamine, and hexadecylamine in a mass ratio of (0.2-0.5):1:(1.3-1.6); Graphene oxide is a single-layer graphene oxide powder with a particle size of 8-15 μm; The dispersant is Tween 60, polyisobutylene succinimide and sodium dodecylbenzenesulfonate in a mass ratio of 1:(0.5-0.7):(1.4-1.6).

2. The turbocharged engine protector according to claim 1, wherein, The graphite powder has a particle size of 150-500 μm.

3. The turbocharged engine protector of claim 1 wherein, The antioxidant is thiophosphoric dioctyl alkyl zinc salt.

4. The turbocharged engine protector of claim 1 wherein, The thickener is either an ethylene-propylene copolymer or a hydrogenated styrene diene copolymer.

5. A method for preparing a turbocharged engine protective agent according to any one of claims 1-4, characterized in that, The process includes the following steps: heating the base oil, adding the thickener, stirring until homogeneous, cooling down and then adding graphite powder and additives, stirring until homogeneous; adding the remaining components, stirring until homogeneous, to obtain the turbocharged engine protectant.

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