Synthetic gasoline engine oil and preparation method thereof

Abstract

The invention discloses synthetic gasoline engine oil and a preparation method, and relates to the technical field of engine oil, the synthetic gasoline engine oil comprises the following raw materials by weight: 100 parts of hydrogenated base oil, 5-9 parts of a purification dispersant, 0.2-1.2 parts of an antioxidant, 4-10 parts of a viscosity index improver, 1.7-4.2 parts of a metal deactivator, 2-8 parts of an antiwear agent, and 0.1-0.6 part of a pour point depressant; the purification dispersant is a nonyl phenol modified polyisobutylene phenol diethylene triamine Mannich base; the nonyl phenol modified polyisobutylene phenol diethylene triamine Mannich base is prepared from the following raw materials in parts by weight: 40 to 60 parts of polyisobutylene phenol diethylene triamine Mannich base, 60 to 90 parts of solvent oil D-60, 40 to 60 parts of formaldehyde solution with the mass fraction of 40 percent and 6.4 to 9.6 parts of nonyl phenol. The synthetic gasoline engine oil provided by the invention has excellent tribological performance, cleaning and dispersing performance and viscosity-temperature performance.

Description

Technical Field

[0001] The present application relates to the field of engine oil technology, and in particular to a synthetic gasoline engine oil and a preparation method thereof. Background Art

[0002] Engine deposits, also known as engine carbon deposits, are solid insoluble substances that are usually attached to the metal wall of the engine due to the high-temperature oxidation reaction of fuel oil and lubricating oil. During the continuous use of gasoline engines, engine deposits will accumulate more and more, and the more accumulated the deposits, the tighter the molecular structure, and the more difficult it is to clean the engine deposits. The accumulation of engine deposits greatly affects the service life of the engine, and the engine is more prone to failure.

[0003] In order to solve the above problems, detergent dispersants are generally added to the engine oil. Its main function is to keep the inside of the engine clean and make the generated insoluble substances in a colloidal suspension state, so as not to further form carbon deposits, paint films or sludge. At present, the most widely used gasoline detergents in China are the third-generation gasoline detergents based on polyisobutylene amine and the fourth-generation gasoline detergents based on polyether amine.

[0004] The main component of the third-generation gasoline detergent, polyisobutylene amine, has a high decomposition temperature and large molecular particles, which are easy to block the electronic fuel injector components used in gasoline engines, causing serious problems such as poor fuel supply at the fuel injector, reduced engine power, or even complete inoperation; while the fourth-generation gasoline detergent has the problem that the carbon-oxygen-carbon single bond is easy to break and has poor thermal stability. It has a poor cleaning effect on intake valve deposits, causing excessive emissions of carbon monoxide and nitrogen oxides in automobile exhaust, and cannot improve the condition of combustion chamber deposits. Therefore, the existing gasoline engine oil still has the problem of poor cleaning and dispersing performance, and it is urgent to provide a new synthetic gasoline engine oil with high cleaning and dispersing performance that can effectively prevent engine wear. Summary of the invention

[0005] In order to improve the cleaning and dispersing performance of synthetic gasoline engine oil, effectively reduce sediment formation, and prevent engine wear, the present application provides a synthetic gasoline engine oil and a preparation method.

[0006] The present application provides a synthetic gasoline engine oil, which adopts the following technical solution:

[0007] A synthetic gasoline engine oil, the raw materials of which include, by weight, 100 parts of hydrogenated base oil, 5-9 parts of detergent dispersant, 0.2-1.2 parts of antioxidant, 4-10 parts of viscosity index improver, 1.7-4.2 parts of metal passivator, 2-8 parts of antiwear agent and 0.1-0.6 parts of pour point depressant; the detergent dispersant is nonylphenol modified polyisobutylene phenol diethylenetriamine Mannich base.

[0008] By adopting the above technical scheme, nonylphenol-modified polyisobutylenephenol diethylenetriamine Mannich base is used as a detergent dispersant for synthetic gasoline engine oil. The nonylphenol-modified polyisobutylenephenol diethylenetriamine Mannich base has stronger fluidity and good thermal stability, and effectively improves the detergent dispersibility of the product, effectively reduces deposit formation, and prevents engine wear.

[0009] Preferably, the raw materials include 100 parts of hydrogenated base oil, 6-8 parts of detergent dispersant, 0.4-1 part of antioxidant, 6-8 parts of viscosity index improver, 2.5-3.5 parts of metal passivator, 3-7 parts of antiwear agent, and 0.2-0.5 parts of pour point depressant by weight.

[0010] Preferably, the raw materials include, by weight, 100 parts of hydrogenated base oil, 7 parts of detergent dispersant, 0.7 parts of antioxidant, 7 parts of viscosity index improver, 3 parts of metal passivator, 5 parts of antiwear agent, and 0.35 parts of pour point depressant.

[0011] Preferably, the hydrogenated base oil includes Class II hydrogenated base oil 500SN, Class III hydrogenated base oil 500SN, and Class III hydrogenated base oil 500N, and the mass ratio of the three is (0.5-1):(0.5-1):1.

[0012] By adopting the above technical scheme, using Class II hydrogenated base oil 500SN, Class III hydrogenated base oil 500SN, and Class III hydrogenated base oil 500N as the hydrogenated base oil, the viscosity index and antioxidant properties of synthetic gasoline engine oil can be effectively improved, the oxidation and deterioration of the engine oil can be effectively controlled, and the oil change period of the engine oil can be extended; the compounding with nonylphenol-modified polyisobutylenephenol diethylenetriamine Mannich base can further reduce the sediment and carbon deposits inside the engine and maintain the good operating condition of the engine.

[0013] Preferably, the viscosity index improver is a PNA type viscosity index improver.

[0014] By adopting the above technical solution, using PNA type viscosity index improver as viscosity index improver can increase oil viscosity, improve viscosity index, improve low temperature starting performance, reduce wear, save fuel, and can be used in all seasons.

[0015] Preferably, the anti-wear agent is a mixture of zinc dialkyl dithiophosphate and molybdenum dithiocarbamate, and the mass ratio of the two is 1:(0.2-0.4)

[0016] By adopting the above technical scheme, zinc dialkyl dithiophosphate and molybdenum dithiocarbamate are used as an anti-wear agent composition, which can effectively reduce the friction coefficient of synthetic gasoline engine oil and reduce the phosphorus content. In combination with nonylphenol-modified polyisobutylenephenol diethylenetriamine Mannich base, the detergency and dispersibility of synthetic gasoline engine oil can be further improved.

[0017] Preferably, the antioxidant is an amine antioxidant or a hindered phenol antioxidant.

[0018] Preferably, the nonylphenol modified polyisobutenylphenol diethylenetriamine Mannich base is prepared from the following raw materials in parts by weight: 40-60 parts of polyisobutenylphenol diethylenetriamine Mannich base, 60-90 parts of solvent oil D-60, 40-60 parts of 40% formaldehyde solution by mass, and 6.4-9.6 parts of nonylphenol.

[0019] Preferably, the polyisobutylenephenol diethylenetriamine Mannich base is prepared from the following raw materials in parts by weight: 30-50 parts of polyisobutylene, 6-10 parts of phenol, 24-40 parts of n-octane, 3-5 parts of boron trifluoride etherate, 40-60 parts of 40% formaldehyde solution by mass, and 40-60 parts of diethylamine.

[0020] Preferably, the preparation method of the nonylphenol modified polyisobutylenephenol diethylenetriamine Mannich base comprises the following steps:

[0021] The polyisobutylenephenol diethylenetriamine Mannich base is uniformly mixed with part of solvent oil D-60 to obtain a mixed solution; the mixed solution, a formaldehyde solution with a mass fraction of 40%, the remaining solvent oil D-60 and nonylphenol are placed in a reaction kettle; the reaction is carried out at a temperature of 102-110° C. for 4-6 hours; after the reaction is completed, the upper organic phase of the product is extracted and the solvent oil D-60 component and unreacted nonylphenol are removed by reduced pressure distillation to obtain nonylphenol-modified polyisobutylenephenol diethylenetriamine Mannich base.

[0022] Preferably, the method for preparing the polyisobutylenephenol diethylenetriamine Mannich base comprises the following steps:

[0023] Add polyisobutylene, phenol, n-octane and boron trifluoride etherate into a reactor, and react at 80-90°C for 4-6 hours; add 40% formaldehyde solution and diethylamine by mass, and react at 102-110°C for 4-6 hours; after the reaction, take out the product, wash with water to remove the water phase, and then distill the product under reduced pressure to obtain polyisobutylenephenol diethylenetriamine Mannich base.

[0024] The present application provides a method for preparing a synthetic gasoline engine oil, which adopts the following technical scheme:

[0025] A method for preparing synthetic gasoline engine oil comprises the following steps:

[0026] Heat the hydrogenated base oil to 50-60°C, stir for 10-30 minutes, add detergent dispersant, antioxidant, viscosity index improver, metal passivator, anti-wear agent, pour point depressant, continue stirring at 50-60°C for 1-3 hours to obtain a mixed oil;

[0027] The prepared mixed oil is filtered at a pressure of 0.1-0.2 MPa to obtain synthetic gasoline engine oil.

[0028] In summary, the present application includes at least one of the following beneficial technical effects:

[0029] 1. The present application adopts nonylphenol modified polyisobutylene phenol diethylene triamine Mannich base as a detergent dispersant for synthetic gasoline engine oil. The nonylphenol modified polyisobutylene phenol diethylene triamine Mannich base has stronger fluidity and good thermal stability, and effectively improves the detergent dispersion of the product, effectively reduces the formation of deposits, and prevents engine wear;

[0030] 2. The use of zinc dialkyl dithiophosphate and molybdenum dithiocarbamate as an anti-wear agent composition can effectively reduce the friction coefficient of synthetic gasoline engine oil and reduce the phosphorus content. In combination with nonylphenol-modified polyisobutylenephenol diethylenetriamine Mannich base, it can further improve the detergency and dispersibility of synthetic gasoline engine oil. DETAILED DESCRIPTION

[0031] The present application is further described in detail below with reference to the embodiments.

[0032] The chemical reagents used in the preparation examples, embodiments and comparative examples provided by the present invention are all commercially available products, and their brands and manufacturers are as follows:

[0033] Polyisobutylene, Zhejiang Shunxin Materials Co., Ltd.;

[0034] Solvent oil D-60, Shanghai Aladdin Biochemical Technology Co., Ltd.;

[0035] Amine antioxidant, Panhua Chemical (Shanghai) Co., Ltd., antioxidant 5057;

[0036] Polymethacrylate, Hubei Nona Technology Co., Ltd.

[0037] Preparation Example 1

[0038] S1. 30 g of polyisobutylene, 6 g of phenol, 24 g of n-octane, and 3 g of boron trifluoride etherate were added to a reactor, and reacted at 80° C. for 4 h; 40 g of a 40% formaldehyde solution and 40 g of diethylamine were added, and reacted at 102° C. for 4 h; after the reaction, the product was taken out, the aqueous phase was removed by washing, and the product was subjected to reduced pressure distillation to obtain polyisobutylene phenol diethylenetriamine Mannich base;

[0039] S2. 40 g of the polyisobutylenephenol diethylenetriamine Mannich base obtained in S1 is uniformly mixed with 40 g of solvent oil D-60 to obtain a mixed solution; the mixed solution is placed in a reaction kettle together with 40 g of a formaldehyde solution with a mass fraction of 40%, 20 g of solvent oil D-60 and 6.4 g of nonylphenol; the mixture is reacted at a temperature of 102°C for 4 hours; after the reaction is completed, the upper organic phase of the product is extracted and the solvent oil D-60 component and unreacted nonylphenol are removed by reduced pressure distillation to obtain nonylphenol-modified polyisobutylenephenol diethylenetriamine Mannich base.

[0040] Preparation Example 2

[0041] S1. Add 40g polyisobutylene, 8g phenol, 32g n-octane, and 4g boron trifluoride etherate into a reactor, and react at 85°C for 5h; add 50g formaldehyde solution with a mass fraction of 40% and 50g diethylamine, and react at 106°C for 5h; after the reaction, take out the product, wash with water to remove the water phase, and then distill the product under reduced pressure to obtain polyisobutylene phenol diethylenetriamine Mannich base;

[0042] S2. 40 g of the polyisobutylenephenol diethylenetriamine Mannich base obtained in S1 is uniformly mixed with 40 g of solvent oil D-60 to obtain a mixed solution; the mixed solution is placed in a reaction kettle together with 40 g of a formaldehyde solution with a mass fraction of 40%, 20 g of solvent oil D-60 and 6.4 g of nonylphenol; the mixture is reacted at a temperature of 102°C for 4 hours; after the reaction is completed, the upper organic phase of the product is extracted and the solvent oil D-60 component and unreacted nonylphenol are removed by reduced pressure distillation to obtain nonylphenol-modified polyisobutylenephenol diethylenetriamine Mannich base.

[0043] Preparation Example 3

[0044] S1. Add 50g of polyisobutylene, 10g of phenol, 40g of n-octane, and 5g of boron trifluoride etherate into a reactor, and react at 90°C for 6h; add 60g of 40% formaldehyde solution and 60g of diethylamine, and react at 110°C for 6h; after the reaction, take out the product, wash with water to remove the water phase, and then distill the product under reduced pressure to obtain polyisobutylene phenol diethylenetriamine Mannich base;

[0045] S2. 40 g of the polyisobutylenephenol diethylenetriamine Mannich base obtained in S1 is uniformly mixed with 40 g of solvent oil D-60 to obtain a mixed solution; the mixed solution is placed in a reaction kettle together with 40 g of a formaldehyde solution with a mass fraction of 40%, 20 g of solvent oil D-60 and 6.4 g of nonylphenol; the mixture is reacted at a temperature of 102°C for 4 hours; after the reaction is completed, the upper organic phase of the product is extracted and the solvent oil D-60 component and unreacted nonylphenol are removed by reduced pressure distillation to obtain nonylphenol-modified polyisobutylenephenol diethylenetriamine Mannich base.

[0046] Preparation Example 4

[0047] S1. 30 g polyisobutylene, 6 g phenol, 24 g n-octane, and 3 g boron trifluoride etherate were added to a reactor, and reacted at 80° C. for 4 h; 40 g formaldehyde solution with a mass fraction of 40% and 40 g diethylamine were added, and reacted at 102° C. for 6 h; after the reaction, the product was taken out, the aqueous phase was removed by washing, and then the product was subjected to reduced pressure distillation to obtain polyisobutylene phenol diethylenetriamine Mannich base;

[0048] S2. 50 g of the polyisobutylenephenol diethylenetriamine Mannich base obtained in S1 is uniformly mixed with 50 g of solvent oil D-60 to obtain a mixed solution; the mixed solution is placed in a reactor together with 50 g of a formaldehyde solution with a mass fraction of 40%, 25 g of solvent oil D-60 and 8 g of nonylphenol; the mixture is reacted at a temperature of 106°C for 5 hours; after the reaction, the upper organic phase of the product is extracted and the solvent oil D-60 component and unreacted nonylphenol are removed by reduced pressure distillation to obtain nonylphenol-modified polyisobutylenephenol diethylenetriamine Mannich base.

[0049] Preparation Example 5

[0050] S1. 30 g polyisobutylene, 6 g phenol, 24 g n-octane, and 3 g boron trifluoride etherate were added to a reactor, and reacted at 80° C. for 4 h; 40 g formaldehyde solution with a mass fraction of 40% and 40 g diethylamine were added, and reacted at 102° C. for 6 h; after the reaction, the product was taken out, the aqueous phase was removed by washing, and then the product was subjected to reduced pressure distillation to obtain polyisobutylene phenol diethylenetriamine Mannich base;

[0051] S2. 60 g of the polyisobutylenephenol diethylenetriamine Mannich base obtained in S1 is uniformly mixed with 60 g of solvent oil D-60 to obtain a mixed solution; the mixed solution is placed in a reactor together with 60 g of a formaldehyde solution with a mass fraction of 40%, 30 g of solvent oil D-60 and 9.6 g of nonylphenol; the mixture is reacted at a temperature of 110°C for 6 hours; after the reaction is completed, the upper organic phase of the product is extracted and the solvent oil D-60 component and unreacted nonylphenol are removed by reduced pressure distillation to obtain nonylphenol-modified polyisobutylenephenol diethylenetriamine Mannich base.

[0052] Example 1

[0053] 25 parts of Class II hydrogenated base oil 500SN, 25 parts of Class III hydrogenated base oil 500SN, and 50 parts of Class III hydrogenated base oil 500N were heated to 50° C. and stirred for 10 min. 5 parts of nonylphenol-modified polyisobutylenephenol diethylenetriamine Mannich base prepared in Preparation Example 1, 0.2 parts of amine antioxidant, 4 parts of PNA type viscosity index improver, 1.7 parts of metal passivator benzotriazole, 1.7 parts of anti-wear agent dialkyl dithiophosphate zinc, 0.3 parts of dithiocarbamate molybdenum, and 0.1 parts of pour point depressant polymethacrylate were added, and the mixture was stirred for 1 h at 50° C. to obtain a mixed oil.

[0054] The prepared mixed oil is filtered at a pressure of 0.1 MPa to obtain synthetic gasoline engine oil.

[0055] Example 2

[0056] 25 parts of Class II hydrogenated base oil 500SN, 25 parts of Class III hydrogenated base oil 500SN, and 50 parts of Class III hydrogenated base oil 500N were heated to 50°C and stirred for 10 minutes, 6 parts of nonylphenol-modified polyisobutylenephenol diethylenetriamine Mannich base prepared in Preparation Example 1, 0.4 parts of amine antioxidant, 6 parts of PNA type viscosity index improver, 2.5 parts of metal passivator benzotriazole, 2.5 parts of anti-wear agent dialkyl dithiophosphate zinc, 0.5 parts of dithiocarbamate molybdenum, and 0.2 parts of pour point depressant polymethacrylate were added, and the mixture was stirred for 1 hour at a temperature of 50°C to obtain a mixed oil;

[0057] The prepared mixed oil is filtered at a pressure of 0.1 MPa to obtain synthetic gasoline engine oil.

[0058] Example 3

[0059] 25 parts of Class II hydrogenated base oil 500SN, 25 parts of Class III hydrogenated base oil 500SN, and 50 parts of Class III hydrogenated base oil 500N were heated to 50° C. and stirred for 10 min. 7 parts of nonylphenol-modified polyisobutylenephenol diethylenetriamine Mannich base prepared in Preparation Example 1, 0.7 parts of amine antioxidant, 7 parts of PNA type viscosity index improver, 3 parts of metal passivator benzotriazole, 4.17 parts of anti-wear agent zinc dialkyl dithiophosphate, 0.83 parts of molybdenum dithiocarbamate, and 0.35 parts of polymethacrylate as a pour point depressant were added, and the mixture was stirred for 1 h at 50° C. to obtain a mixed oil.

[0060] The prepared mixed oil is filtered at a pressure of 0.1 MPa to obtain synthetic gasoline engine oil.

[0061] Example 4

[0062] 25 parts of Class II hydrogenated base oil 500SN, 25 parts of Class III hydrogenated base oil 500SN, and 50 parts of Class III hydrogenated base oil 500N were heated to 50° C. and stirred for 10 min. 8 parts of nonylphenol-modified polyisobutylenephenol diethylenetriamine Mannich base prepared in Preparation Example 1, 1 part of amine antioxidant, 8 parts of PNA type viscosity index improver, 3.5 parts of metal passivator benzotriazole, 5.8 parts of anti-wear agent dialkyl dithiophosphate zinc, 1.2 parts of dithiocarbamate molybdenum, and 0.5 parts of pour point depressant polymethacrylate were added, and the mixture was stirred for 1 h at 50° C. to obtain a mixed oil.

[0063] The prepared mixed oil is filtered at a pressure of 0.1 MPa to obtain synthetic gasoline engine oil.

[0064] Example 5

[0065] 25 parts of Class II hydrogenated base oil 500SN, 25 parts of Class III hydrogenated base oil 500SN, and 50 parts of Class III hydrogenated base oil 500N were heated to 50° C. and stirred for 10 min. 9 parts of nonylphenol-modified polyisobutylenephenol diethylenetriamine Mannich base prepared in Preparation Example 1, 1.2 parts of amine antioxidant, 10 parts of PNA type viscosity index improver, 4.2 parts of metal passivator benzotriazole, 6.7 parts of anti-wear agent zinc dialkyl dithiophosphate, 1.3 parts of molybdenum dithiocarbamate, and 0.6 parts of polymethacrylate as a pour point depressant were added, and the mixture was stirred for 1 h at a temperature of 50° C. to obtain a mixed oil.

[0066] The prepared mixed oil is filtered at a pressure of 0.1 MPa to obtain synthetic gasoline engine oil.

[0067] Example 6

[0068] 25 parts of Class II hydrogenated base oil 500SN, 25 parts of Class III hydrogenated base oil 500SN, and 50 parts of Class III hydrogenated base oil 500N were heated to 55° C. and stirred for 20 min. 5 parts of nonylphenol-modified polyisobutylenephenol diethylenetriamine Mannich base prepared in Preparation Example 1, 0.2 parts of amine antioxidant, 4 parts of PNA type viscosity index improver, 1.7 parts of metal passivator benzotriazole, 1.7 parts of anti-wear agent dialkyl dithiophosphate zinc, 0.3 parts of dithiocarbamate molybdenum, and 0.1 parts of pour point depressant polymethacrylate were added, and the mixture was stirred for 2 h at a temperature of 55° C. to obtain a mixed oil.

[0069] The prepared mixed oil is filtered at a pressure of 0.15 MPa to obtain synthetic gasoline engine oil.

[0070] Example 7

[0071] 25 parts of Class II hydrogenated base oil 500SN, 25 parts of Class III hydrogenated base oil 500SN, and 50 parts of Class III hydrogenated base oil 500N were heated to 60°C and stirred for 30 minutes, 5 parts of nonylphenol-modified polyisobutylenephenol diethylenetriamine Mannich base prepared in Preparation Example 1, 0.2 parts of amine antioxidant, 4 parts of PNA type viscosity index improver, 1.7 parts of metal passivator benzotriazole, 1.7 parts of anti-wear agent dialkyl dithiophosphate zinc, 0.3 parts of dithiocarbamate molybdenum, and 0.1 parts of pour point depressant polymethacrylate were added, and the mixture was stirred for 3 hours at 60°C to obtain a mixed oil;

[0072] The prepared mixed oil is filtered at a pressure of 0.2 MPa to obtain synthetic gasoline engine oil.

[0073] Example 8

[0074] 30 parts of Class II hydrogenated base oil 500SN, 30 parts of Class III hydrogenated base oil 500SN, and 40 parts of Class III hydrogenated base oil 500N were heated to 50° C. and stirred for 10 min. 5 parts of nonylphenol-modified polyisobutylenephenol diethylenetriamine Mannich base prepared in Preparation Example 1, 0.2 parts of amine antioxidant, 4 parts of PNA type viscosity index improver, 1.7 parts of metal passivator benzotriazole, 1.7 parts of anti-wear agent dialkyl dithiophosphate zinc, 0.3 parts of dithiocarbamate molybdenum, and 0.1 parts of pour point depressant polymethacrylate were added, and the mixture was stirred for 1 h at a temperature of 50° C. to obtain a mixed oil.

[0075] The prepared mixed oil is filtered at a pressure of 0.1 MPa to obtain synthetic gasoline engine oil.

[0076] Example 9

[0077] 33.3 parts of Class II hydrogenated base oil 500SN, 33.3 parts of Class III hydrogenated base oil 500SN, and 33.4 parts of Class III hydrogenated base oil 500N were heated to 50° C. and stirred for 10 min. 5 parts of nonylphenol-modified polyisobutylenephenol diethylenetriamine Mannich base prepared in Preparation Example 1, 0.2 parts of amine antioxidant, 4 parts of PNA type viscosity index improver, 1.7 parts of metal passivator benzotriazole, 1.7 parts of anti-wear agent dialkyl dithiophosphate zinc, 0.3 parts of dithiocarbamate molybdenum, and 0.1 parts of pour point depressant polymethacrylate were added, and the mixture was stirred for 1 h at a temperature of 50° C. to obtain a mixed oil;

[0078] The prepared mixed oil is filtered at a pressure of 0.1 MPa to obtain synthetic gasoline engine oil.

[0079] Example 10

[0080] 16.65 parts of Class II hydrogenated base oil 500SN, 16.65 parts of Class III hydrogenated base oil 500SN, and 66.7 parts of Class III hydrogenated base oil 500N were heated to 50° C. and stirred for 10 min. 5 parts of nonylphenol-modified polyisobutylenephenol diethylenetriamine Mannich base prepared in Preparation Example 1, 0.2 parts of amine antioxidant, 4 parts of PNA type viscosity index improver, 1.7 parts of metal passivator benzotriazole, 1.7 parts of anti-wear agent dialkyl dithiophosphate zinc, 0.3 parts of dithiocarbamate molybdenum, and 0.1 parts of pour point depressant polymethacrylate were added, and the mixture was stirred for 1 h at 50° C. to obtain a mixed oil.

[0081] The prepared mixed oil is filtered at a pressure of 0.1 MPa to obtain synthetic gasoline engine oil.

[0082] Embodiment 11

[0083] 37.5 parts of Class II hydrogenated base oil 500SN, 37.5 parts of Class III hydrogenated base oil 500SN, and 25 parts of Class III hydrogenated base oil 500N were heated to 50° C. and stirred for 10 min. 5 parts of nonylphenol-modified polyisobutylenephenol diethylenetriamine Mannich base prepared in Preparation Example 1, 0.2 parts of amine antioxidant, 4 parts of PNA type viscosity index improver, 1.7 parts of metal passivator benzotriazole, 1.7 parts of anti-wear agent dialkyl dithiophosphate zinc, 0.3 parts of dithiocarbamate molybdenum, and 0.1 parts of pour point depressant polymethacrylate were added, and the mixture was stirred for 1 h at a temperature of 50° C. to obtain a mixed oil.

[0084] The prepared mixed oil is filtered at a pressure of 0.1 MPa to obtain synthetic gasoline engine oil.

[0085] Example 12

[0086] The difference between Example 12 and Example 1 is that the nonylphenol-modified polyisobutylenephenol diethylenetriamine Mannich base used in Example 12 is prepared by Preparation Example 2.

[0087] Example 13

[0088] The difference between Example 13 and Example 1 is that the nonylphenol-modified polyisobutylenephenol diethylenetriamine Mannich base used in Example 13 is prepared by Preparation Example 3.

[0089] Embodiment 14

[0090] The difference between Example 14 and Example 1 is that the nonylphenol-modified polyisobutylenephenol diethylenetriamine Mannich base used in Example 14 is prepared by Preparation Example 4.

[0091] Embodiment 15

[0092] The difference between Example 15 and Example 1 is that the nonylphenol-modified polyisobutylenephenol diethylenetriamine Mannich base used in Example 15 is prepared by Preparation Example 5.

[0093] Example 16

[0094] The difference between Example 16 and Example 1 is that the anti-wear agent zinc dialkyl dithiophosphate used in Example 16 is 1.5 parts and the amount of molybdenum dithiocarbamate is 0.5 parts.

[0095] Embodiment 17

[0096] The difference between Example 17 and Example 1 is that the anti-wear agent zinc dialkyl dithiophosphate used in Example 17 is 1.4 parts and the amount of molybdenum dithiocarbamate is 0.6 parts.

[0097] Embodiment 18

[0098] The difference between Example 18 and Example 1 is that the amount of the anti-wear agent zinc dialkyl dithiophosphate used in Example 18 is 2 parts, and the amount of molybdenum dithiocarbamate is 0 parts.

[0099] Embodiment 19

[0100] The difference between Example 19 and Example 1 is that the anti-wear agent zinc dialkyl dithiophosphate and molybdenum dithiocarbamate used in Example 19 are 1 part and 1 part, respectively.

[0101] Comparative Example 1

[0102] 25 parts of Class II hydrogenated base oil 500SN, 25 parts of Class III hydrogenated base oil 500SN, and 50 parts of Class III hydrogenated base oil 500N were heated to 50° C. and stirred for 10 min. 11 parts of nonylphenol-modified polyisobutylenephenol diethylenetriamine Mannich base prepared in Preparation Example 1, 1.4 parts of amine antioxidant, 12 parts of PNA type viscosity index improver, 5 parts of metal passivator benzotriazole, 7.5 parts of anti-wear agent zinc dialkyl dithiophosphate, 1.5 parts of molybdenum dithiocarbamate, and 0.8 parts of polymethacrylate as a pour point depressant were added, and the mixture was stirred for 1 h at 50° C. to obtain a mixed oil.

[0103] The prepared mixed oil is filtered at a pressure of 0.1 MPa to obtain synthetic gasoline engine oil.

[0104] Comparative Example 2

[0105] 25 parts of Class II hydrogenated base oil 500SN, 25 parts of Class III hydrogenated base oil 500SN, and 50 parts of Class III hydrogenated base oil 500N were heated to 50° C. and stirred for 10 min. 3 parts of nonylphenol-modified polyisobutylenephenol diethylenetriamine Mannich base prepared in Preparation Example 1, 0.1 parts of amine antioxidants, 2 parts of PNA type viscosity index improvers, 1 part of metal passivator benzotriazole, 0.83 parts of anti-wear agents zinc dialkyl dithiophosphate, 0.17 parts of molybdenum dithiocarbamate, and 0.05 parts of polymethacrylate depressant were added, and the mixture was stirred for 1 h at 50° C. to obtain a mixed oil.

[0106] The prepared mixed oil is filtered at a pressure of 0.1 MPa to obtain synthetic gasoline engine oil.

[0107] Comparative Example 3

[0108] The difference between Comparative Example 3 and Example 1 is that the added amount of the detergent dispersant nonylphenol-modified polyisobutylenephenol diethylenetriamine Mannich base in Comparative Example 3 is 0.

[0109] Comparative Example 4

[0110] The difference between Comparative Example 4 and Example 1 is that the detergent dispersant used in Comparative Example 4 is succinate.

[0111] Performance testing

[0112] 1. The friction coefficient of the synthetic gasoline engine oil obtained in Examples 1-19 and Comparative Examples 1-4 was tested. The test method was carried out in accordance with the provisions of SH / T 0189-2017. The results are shown in Table 1.

[0113] 2. The mechanical impurities of the synthetic gasoline engine oils obtained in Examples 1-19 and Comparative Examples 1-4 were tested. The test method was carried out in accordance with the provisions of GB / T 511. The results are shown in Table 1.

[0114] 3. The viscosity index of the synthetic gasoline engine oils obtained in Examples 1-19 and Comparative Examples 1-4 was tested. The test method was carried out in accordance with the provisions of GB / T 1995. The results are shown in Table 1.

[0115] The specific test results are as follows:

[0116] Table 1 Friction coefficient, mechanical impurities, and viscosity index of synthetic gasoline engine oils obtained in Examples 1-19 and Comparative Examples 1-4

[0117]

[0118]

[0119] It can be seen from the test results in Table 1 that the synthetic gasoline engine oil provided in the present application has a low friction coefficient, a high viscosity index, and no mechanical impurities, indicating that the gasoline engine oil provided in the present application has excellent viscosity-temperature performance and excellent viscosity retention capabilities at both high and low temperatures; it has excellent tribological properties and can improve the load-bearing and anti-wear properties of the engine oil; it also has excellent cleaning and dispersing properties and can effectively avoid deposit formation and prevent engine wear.

[0120] It can be seen from the test results of Examples 1-7 and Comparative Examples 1 and 2 that the raw material components and preparation process of a synthetic gasoline engine oil provided in the present application are beneficial to improving the tribological properties, cleaning and dispersion properties and viscosity-temperature properties of the synthetic gasoline engine oil.

[0121] It can be seen from the test results of Example 1, Example 8, Example 9, Example 10 and Example 11 that when the mass ratio of the Class II hydrogenated base oil 500SN, Class III hydrogenated base oil 500SN and Class III hydrogenated base oil 500N used in the present application is within the range of (0.5-1):(0.5-1):1, it is beneficial to obtain a synthetic gasoline engine oil with higher tribological properties, cleaning and dispersion properties and viscosity-temperature properties; when the mass ratio of the Class II hydrogenated base oil 500SN, Class III hydrogenated base oil 500SN and Class III hydrogenated base oil 500N is lower than or exceeds this range, the friction coefficient and viscosity index of the obtained synthetic gasoline engine oil are significantly reduced.

[0122] It can be seen from the test results of Example 1, Example 12, Example 13, Example 14, and Example 15 that the raw material components and preparation process of the nonylphenol-modified polyisobutylenephenol diethylenetriamine Mannich base provided in the present application are beneficial to improving the tribological properties, cleaning and dispersing properties, and viscosity-temperature properties of synthetic gasoline engine oil. It can be seen from the test results of Comparative Examples 3 and 4 that when nonylphenol-modified polyisobutylenephenol diethylenetriamine Mannich base is not used as a cleaning and dispersing agent, the friction coefficient and viscosity index of the obtained synthetic gasoline engine oil are significantly reduced, and obvious mechanical impurities are generated.

[0123] It can be seen from the test results of Example 1, Example 16, Example 17, Example 18, and Example 19 that the present application adopts a mixture of dialkyl zinc dithiophosphate and molybdenum dithiocarbamate as an anti-wear agent, which can significantly improve the tribological properties and cleaning and dispersing properties of synthetic gasoline engine oil; when a single dialkyl zinc dithiophosphate is used, the tribological properties are significantly reduced; and the preferred mass ratio of zinc dithiophosphate to molybdenum dithiocarbamate is 1:(0.2-0.4).

[0124] 4. Test method for 100°C kinematic viscosity of the synthetic gasoline engine oil obtained in Example 1: The test was carried out in accordance with the provisions of GB / T 265. The results are shown in Table 2.

[0125] V. Test method for 40°C kinematic viscosity of the synthetic gasoline engine oil obtained in Example 1: The test was carried out in accordance with the provisions of GB / T 265. The results are shown in Table 2.

[0126] VI. Test method for low temperature dynamic viscosity of synthetic gasoline engine oil obtained in Example 1: refer to the provisions of GB / T6538, and the results are shown in Table 2;

[0127] VII. Test method for pour point of synthetic gasoline engine oil obtained in Example 1: refer to the provisions in GB / T3535, and the results are shown in Table 2;

[0128] 8. The flash point test method of the synthetic gasoline engine oil obtained in Example 1 was carried out in accordance with the provisions of GB / T3536. The results are shown in Table 2.

[0129] IX. Test method for base value of synthetic gasoline engine oil obtained in Example 1: refer to the provisions of SH / T0251, and the results are shown in Table 2;

[0130] 10. Test method for high temperature and high shear viscosity of synthetic gasoline engine oil obtained in Example 1: refer to the provisions of SH / T0703, and the results are shown in Table 2;

[0131] XI. Test method for evaporation loss (mass fraction) of synthetic gasoline engine oil obtained in Example 1: refer to the provisions of SH / T 0059, and the results are shown in Table 2;

[0132] 12. Test method for high temperature foam of the synthetic gasoline engine oil obtained in Example 1: refer to the provisions in SH / T 0722. The results are shown in Table 2.

[0133] The specific test results are as follows:

[0134] Table 2 Performance test results of synthetic gasoline engine oil obtained in Example 1

[0135]

[0136]

[0137] It can be seen from the test data in Table 2 that the synthetic gasoline engine oil provided in the present application has a low kinematic viscosity and good fluidity; a low pour point and a low low-temperature dynamic viscosity, indicating good low-temperature fluidity; a low evaporation loss and a high base number, indicating excellent high-temperature detergency, dispersibility and thermal stability.

[0138] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed. However, as long as it is within the scope of the claims of the present application, it shall be protected by the patent law.

Claims

1. A synthetic gasoline engine oil, characterized in that: The raw materials include 100 parts of hydrogenated base oil, 5-9 parts of detergent dispersant, 0.2-1.2 parts of antioxidant, 4-10 parts of viscosity index improver, 1.7-4.2 parts of metal passivator, 2-8 parts of antiwear agent and 0.1-0.6 parts of pour point depressant by weight; the detergent dispersant is nonylphenol modified polyisobutylene phenol diethylenetriamine Mannich base.

2. A synthetic gasoline engine oil according to claim 1, characterized in that: The raw materials include 100 parts of hydrogenated base oil, 6-8 parts of detergent dispersant, 0.4-1 part of antioxidant, 6-8 parts of viscosity index improver, 2.5-3.5 parts of metal passivator, 3-7 parts of antiwear agent and 0.2-0.5 parts of pour point depressant by weight.

3. A synthetic gasoline engine oil according to claim 2, characterized in that: The raw materials include 100 parts of hydrogenated base oil, 7 parts of detergent dispersant, 0.7 parts of antioxidant, 7 parts of viscosity index improver, 3 parts of metal passivator, 5 parts of anti-wear agent and 0.35 parts of pour point depressant by weight.

4. A synthetic gasoline engine oil according to claim 1, characterized in that: The hydrogenated base oil includes Class II hydrogenated base oil 500SN, Class III hydrogenated base oil 500SN, and Class III hydrogenated base oil 500N, and the mass ratio of the three is (0.5-1):(0.5-1):

1.

5. A synthetic gasoline engine oil according to claim 1, characterized in that: The viscosity index improver is a PNA type viscosity index improver.

6. A synthetic gasoline engine oil according to claim 1, characterized in that: The anti-wear agent is a mixture of zinc dialkyl dithiophosphate and molybdenum dithiocarbamate, and the mass ratio of the two is 1:(0.2-0.4).

7. A synthetic gasoline engine oil according to claim 1, characterized in that: The nonylphenol modified polyisobutylenephenol diethylenetriamine Mannich base is prepared from the following raw materials in parts by weight: 40-60 parts of polyisobutylenephenol diethylenetriamine Mannich base, 60-90 parts of solvent oil D-60, 40-60 parts of 40% formaldehyde solution by mass, and 6.4-9.6 parts of nonylphenol.

8. A synthetic gasoline engine oil according to claim 7, characterized in that: The polyisobutylenephenol diethylenetriamine Mannich base is prepared from the following raw materials in parts by weight: 30-50 parts of polyisobutylene, 6-10 parts of phenol, 24-40 parts of n-octane, 3-5 parts of boron trifluoride etherate, 40-60 parts of formaldehyde solution with a mass fraction of 40%, and 40-60 parts of diethylamine.

9. A synthetic gasoline engine oil according to claim 7, characterized in that: The preparation method of the nonylphenol modified polyisobutylenephenol diethylenetriamine Mannich base comprises the following steps: The polyisobutylenephenol diethylenetriamine Mannich base is uniformly mixed with part of solvent oil D-60 to obtain a mixed solution; the mixed solution, a formaldehyde solution with a mass fraction of 40%, the remaining solvent oil D-60 and nonylphenol are placed in a reaction kettle; the reaction is carried out at a temperature of 102-110° C. for 4-6 hours; after the reaction is completed, the upper organic phase of the product is extracted and the solvent oil D-60 component and unreacted nonylphenol are removed by reduced pressure distillation to obtain nonylphenol-modified polyisobutylenephenol diethylenetriamine Mannich base.

10. A method for preparing a synthetic gasoline engine oil according to any one of claims 1 to 9, characterized in that: The following steps are involved: Heat the hydrogenated base oil to 50-60°C, stir for 10-30 minutes, add detergent dispersant, antioxidant, viscosity index improver, metal passivator, anti-wear agent, pour point depressant, continue stirring at 50-60°C for 1-3 hours to obtain a mixed oil; The prepared mixed oil is filtered at a pressure of 0.1-0.2 MPa to obtain synthetic gasoline engine oil.

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