Synthetic gasoline engine oil and preparation method thereof

Abstract

The present application discloses a synthetic gasoline engine oil and a preparation method, relating to the field of engine oil technology. The raw materials 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 a nonylphenol-modified polyisobutylene phenol diethylenetriamine Mannich base; and the nonylphenol-modified polyisobutylene phenol diethylenetriamine Mannich base is prepared from the following raw materials by weight: 40-60 parts of polyisobutylene phenol 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. The synthetic gasoline engine oil provided by the present application has excellent tribological properties, detergent dispersancy properties, 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 carbon deposits, are insoluble solids formed by the high-temperature oxidation reaction of fuel and lubricating oil, typically adhering to the metal walls of the engine. With continued use, engine deposits accumulate, and the more they accumulate, the tighter their molecular structure becomes, making them increasingly difficult to remove. The accumulation of engine deposits significantly shortens the engine's service life and makes it more susceptible to failure.

[0003] To address these issues, detergent dispersants are typically added to engine oil. Their primary function is to keep the engine clean and maintain a colloidal suspension of insoluble matter, preventing the formation of carbon deposits, varnish, or sludge. Currently, the most widely used gasoline detergents in China are third-generation gasoline detergents based on polyisobutylene amine and fourth-generation gasoline detergents based on polyether amine.

[0004] The main component of third-generation gasoline detergents, polyisobutyleneamine, suffers from a high decomposition temperature and large molecular particles, making it prone to clogging the electronic fuel injectors used in current gasoline engines. This can lead to serious problems such as poor fuel flow to the injectors, reduced engine power, or even complete inefficiency. Fourth-generation gasoline detergents, on the other hand, suffer from the problem of easily breaking carbon-oxygen-carbon single bonds and poor thermal stability. This makes them ineffective at cleaning intake valve deposits, contributing to excessive carbon monoxide and nitrogen oxide emissions in vehicle exhaust, and failing to improve combustion chamber deposits. Therefore, existing gasoline engine oils still suffer from poor detergency and dispersancy, creating an urgent need for a new synthetic gasoline engine oil with enhanced detergency and dispersancy that can effectively prevent engine wear. Summary of the Invention

[0005] In order to improve the detergency and dispersibility 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 comprises, by weight, 100 parts of hydrogenated base oil, 5-9 parts of a detergent 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 passivator, 2-8 parts of an antiwear agent, and 0.1-0.6 parts of a pour point depressant; the detergent dispersant is a nonylphenol-modified polyisobutylenephenol diethylenetriamine Mannich base.

[0008] By adopting the above technical solution, nonylphenol-modified polyisobutenylphenol diethylenetriamine Mannich base is used as a detergent dispersant for synthetic gasoline engine oil. The nonylphenol-modified polyisobutenylphenol diethylenetriamine Mannich base has stronger fluidity and good thermal stability, and effectively improves the detergency and 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 in parts 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 solution, a compound of Class II hydrogenated base oil 500SN, Class III hydrogenated base oil 500SN, and Class III hydrogenated base oil 500N is used as the hydrogenated base oil, which can effectively improve the viscosity index and antioxidant properties of synthetic gasoline engine oil, effectively control the oxidation and deterioration of the engine oil, and extend the oil change period; compounding with nonylphenol-modified polyisobutylenephenol diethylenetriamine Mannich base can further reduce sediment and carbon deposits inside the engine, thereby maintaining the engine in good operating condition.

[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, with a mass ratio of 1:(0.2-0.4)

[0016] By adopting the above technical solution, 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 polyisobutenylphenol diethylenetriamine Mannich base is prepared from the following raw materials in parts by weight: 30-50 parts of polyisobutene, 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 polyisobutenylphenol diethylenetriamine Mannich base comprises the following steps:

[0021] The method comprises the following steps: uniformly mixing polyisobutenylphenol diethylenetriamine Mannich base with a portion of solvent oil D-60 to obtain a mixed solution; placing the mixed solution, a formaldehyde solution having a mass fraction of 40%, the remaining solvent oil D-60, and nonylphenol in a reaction kettle; reacting the mixture at a temperature of 102-110° C. for 4-6 hours; extracting the upper organic phase of the product and performing reduced pressure distillation to remove the solvent oil D-60 component and unreacted nonylphenol, thereby obtaining nonylphenol-modified polyisobutenylphenol diethylenetriamine Mannich base.

[0022] Preferably, the preparation method of the polyisobutenylphenol diethylenetriamine Mannich base comprises the following steps:

[0023] Polyisobutylene, phenol, n-octane, and boron trifluoride etherate are added to a reactor and reacted at a temperature of 80-90°C for 4-6 hours; a 40% by mass formaldehyde solution and diethylamine are added and reacted at a temperature of 102-110°C for 4-6 hours; after the reaction is completed, the product is taken out, washed with water to remove the aqueous phase, and then the product is subjected to reduced pressure distillation to obtain a polyisobutylenephenol diethylenetriamine Mannich base.

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

[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, and 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, this application includes at least one of the following beneficial technical effects:

[0029] 1. This application uses nonylphenol-modified polyisobutylenephenol diethylenetriamine Mannich base 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 product's detergency and dispersibility, effectively reduces deposit formation, and prevents engine wear.

[0030] 2. Using a combination 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. Combining it with nonylphenol-modified polyisobutylenephenol diethylenetriamine Mannich base 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 removed, washed with water to remove the aqueous phase, and then the product was distilled under reduced pressure to obtain a polyisobutylenephenol diethylenetriamine Mannich base;

[0039] S2. 40 g of the polyisobutenylphenol 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 reactor together with 40 g of a 40% formaldehyde solution, 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 h; 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 vacuum distillation to obtain nonylphenol-modified polyisobutenylphenol diethylenetriamine Mannich base.

[0040] Preparation Example 2

[0041] S1. 40 g of polyisobutylene, 8 g of phenol, 32 g of n-octane, and 4 g of boron trifluoride etherate were added to a reactor and reacted at 85 ° C for 5 h; 50 g of a 40% formaldehyde solution and 50 g of diethylamine were added and reacted at 106 ° C for 5 h; after the reaction, the product was removed, washed with water to remove the aqueous phase, and then the product was distilled under reduced pressure to obtain a polyisobutylene phenol diethylenetriamine Mannich base;

[0042] S2. 40 g of the polyisobutenylphenol 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 reactor together with 40 g of a 40% formaldehyde solution, 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 h; 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 vacuum distillation to obtain nonylphenol-modified polyisobutenylphenol diethylenetriamine Mannich base.

[0043] Preparation Example 3

[0044] S1. 50 g of polyisobutylene, 10 g of phenol, 40 g of n-octane, and 5 g of boron trifluoride etherate were added to a reactor and reacted at 90°C for 6 h; 60 g of a 40% formaldehyde solution and 60 g of diethylamine were added and reacted at 110°C for 6 h; after the reaction, the product was removed, washed with water to remove the aqueous phase, and then the product was distilled under reduced pressure to obtain a polyisobutylenephenol diethylenetriamine Mannich base;

[0045] S2. 40 g of the polyisobutenylphenol 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 reactor together with 40 g of a 40% formaldehyde solution, 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 h; 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 vacuum distillation to obtain nonylphenol-modified polyisobutenylphenol diethylenetriamine Mannich base.

[0046] Preparation Example 4

[0047] 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 6 h; after the reaction, the product was removed, washed with water to remove the aqueous phase, and then the product was distilled under reduced pressure to obtain a polyisobutylenephenol diethylenetriamine Mannich base;

[0048] S2. 50 g of the polyisobutenylphenol 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 40% formaldehyde solution, 25 g of solvent oil D-60 and 8 g of nonylphenol; the mixture is reacted at a temperature of 106°C for 5 h; 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 vacuum distillation to obtain nonylphenol-modified polyisobutenylphenol diethylenetriamine Mannich base.

[0049] Preparation Example 5

[0050] 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 6 h; after the reaction, the product was removed, washed with water to remove the aqueous phase, and then the product was distilled under reduced pressure to obtain a polyisobutylenephenol diethylenetriamine Mannich base;

[0051] S2. 60 g of the polyisobutenylphenol 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 40% formaldehyde solution, 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 h; 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 vacuum distillation to obtain nonylphenol-modified polyisobutenylphenol 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 polyisobutenylphenol diethylenetriamine Mannich base prepared in Preparation Example 1, 0.2 parts of an amine antioxidant, 4 parts of a PNA type viscosity index improver, 1.7 parts of a metal passivator benzotriazole, 1.7 parts of an antiwear agent zinc dialkyl dithiophosphate, 0.3 parts of a molybdenum dithiocarbamate, and 0.1 parts of a pour point depressant polymethacrylate were added, and the mixture was stirred at 50° C. for 1 h 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 min. 6 parts of nonylphenol-modified polyisobutenylphenol diethylenetriamine Mannich base prepared in Preparation Example 1, 0.4 parts of an amine antioxidant, 6 parts of a PNA viscosity index improver, 2.5 parts of a metal passivator benzotriazole, 2.5 parts of an antiwear agent zinc dialkyl dithiophosphate, 0.5 parts of a molybdenum dithiocarbamate, and 0.2 parts of a pour point depressant polymethacrylate were added, and the mixture was stirred at 50° C. for 1 h 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 polyisobutenylphenol diethylenetriamine Mannich base prepared in Preparation Example 1, 0.7 parts of an amine antioxidant, 7 parts of a PNA viscosity index improver, 3 parts of a metal passivator benzotriazole, 4.17 parts of zinc dialkyl dithiophosphate and 0.83 parts of molybdenum dithiocarbamate as antiwear agents, and 0.35 parts of a polymethacrylate as a pour point depressant were added. The mixture was stirred at 50° C. for 1 h 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 polyisobutenylphenol diethylenetriamine Mannich base prepared in Preparation Example 1, 1 part of an amine antioxidant, 8 parts of a PNA-type viscosity index improver, 3.5 parts of a metal passivator benzotriazole, 5.8 parts of zinc dialkyl dithiophosphate and 1.2 parts of molybdenum dithiocarbamate as antiwear agents, and 0.5 parts of a polymethacrylate as a pour point depressant were added. The mixture was stirred at 50° C. for 1 h 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 polyisobutenylphenol diethylenetriamine Mannich base prepared in Preparation Example 1, 1.2 parts of an amine antioxidant, 10 parts of a PNA type viscosity index improver, 4.2 parts of a metal passivator benzotriazole, 6.7 parts of zinc dialkyl dithiophosphate and 1.3 parts of molybdenum dithiocarbamate as antiwear agents, and 0.6 parts of a polymethacrylate as a pour point depressant were added. The mixture was stirred at 50° C. for 1 h 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 polyisobutenylphenol diethylenetriamine Mannich base prepared in Preparation Example 1, 0.2 parts of an amine antioxidant, 4 parts of a PNA type viscosity index improver, 1.7 parts of a metal passivator benzotriazole, 1.7 parts of an antiwear agent zinc dialkyl dithiophosphate, 0.3 parts of a molybdenum dithiocarbamate, and 0.1 parts of a pour point depressant polymethacrylate were added, and the mixture was stirred at 55° C. for 2 h 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 min. 5 parts of nonylphenol-modified polyisobutenylphenol diethylenetriamine Mannich base prepared in Preparation Example 1, 0.2 parts of an amine antioxidant, 4 parts of a PNA viscosity index improver, 1.7 parts of a metal passivator benzotriazole, 1.7 parts of an antiwear agent zinc dialkyl dithiophosphate, 0.3 parts of a molybdenum dithiocarbamate, and 0.1 parts of a pour point depressant polymethacrylate were added, and the mixture was stirred at 60° C. for 3 h 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 polyisobutenylphenol diethylenetriamine Mannich base prepared in Preparation Example 1, 0.2 parts of an amine antioxidant, 4 parts of a PNA viscosity index improver, 1.7 parts of a metal passivator benzotriazole, 1.7 parts of an antiwear agent zinc dialkyl dithiophosphate, 0.3 parts of a molybdenum dithiocarbamate, and 0.1 parts of a pour point depressant polymethacrylate were added, and the mixture was stirred at 50° C. for 1 h 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 polyisobutenylphenol diethylenetriamine Mannich base prepared in Preparation Example 1, 0.2 parts of an amine antioxidant, 4 parts of a PNA type viscosity index improver, 1.7 parts of a metal passivator benzotriazole, 1.7 parts of an antiwear agent zinc dialkyl dithiophosphate, 0.3 parts of a molybdenum dithiocarbamate, and 0.1 parts of a pour point depressant polymethacrylate were added, and the mixture was stirred at 50° C. for 1 h 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 polyisobutenylphenol diethylenetriamine Mannich base prepared in Preparation Example 1, 0.2 parts of an amine antioxidant, 4 parts of a PNA-type viscosity index improver, 1.7 parts of a metal passivator benzotriazole, 1.7 parts of an antiwear agent zinc dialkyl dithiophosphate, 0.3 parts of a molybdenum dithiocarbamate, and 0.1 parts of a pour point depressant polymethacrylate were added, and the mixture was stirred at 50° C. for 1 h 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] Example 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 polyisobutenylphenol diethylenetriamine Mannich base prepared in Preparation Example 1, 0.2 parts of an amine antioxidant, 4 parts of a PNA viscosity index improver, 1.7 parts of a metal passivator benzotriazole, 1.7 parts of an antiwear agent zinc dialkyl dithiophosphate, 0.3 parts of a molybdenum dithiocarbamate, and 0.1 parts of a pour point depressant polymethacrylate were added, and the mixture was stirred at 50° C. for 1 h 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 from 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 from Preparation Example 3.

[0089] Example 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 from Preparation Example 4.

[0091] Example 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 from 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] Example 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 used is 0.6 parts.

[0097] Example 18

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

[0099] Example 19

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

[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 polyisobutenylphenol diethylenetriamine Mannich base prepared in Preparation Example 1, 1.4 parts of an amine antioxidant, 12 parts of a PNA viscosity index improver, 5 parts of a metal passivator benzotriazole, 7.5 parts of zinc dialkyl dithiophosphate and 1.5 parts of molybdenum dithiocarbamate as antiwear agents, and 0.8 parts of a polymethacrylate as a pour point depressant were added. The mixture was stirred at 50° C. for 1 h 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 polyisobutenylphenol diethylenetriamine Mannich base prepared in Preparation Example 1, 0.1 part of an amine antioxidant, 2 parts of a PNA viscosity index improver, 1 part of a metal passivator benzotriazole, 0.83 parts of zinc dialkyl dithiophosphate and 0.17 parts of molybdenum dithiocarbamate as antiwear agents, and 0.05 parts of polymethacrylate as a pour point depressant were added. The mixture was stirred at 50° C. for 1 h 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 polyisobutenylphenol 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 as specified in SH / T 0189-2017. The results are shown in Table 1.

[0113] 2. Mechanical impurities in 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 based on 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 the 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 ability at 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 detergency and dispersibility, which 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 this application are beneficial to improving the tribological properties, detergency 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 this application is within the range of (0.5-1):(0.5-1):1, it is beneficial to obtain a synthetic gasoline engine oil with high tribological properties, detergency 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] The test results of Examples 1, 12, 13, 14, and 15 demonstrate that the raw material components and preparation process of the nonylphenol-modified polyisobutylenephenol-diethylenetriamine Mannich base provided herein are beneficial for improving the tribological properties, detergency, dispersancy, and viscosity-temperature performance of synthetic gasoline engine oils. The test results of Comparative Examples 3 and 4 demonstrate that when the nonylphenol-modified polyisobutylenephenol-diethylenetriamine Mannich base Mannich base is not used as a detergent and dispersant, the friction coefficient and viscosity index of the resulting synthetic gasoline engine oil are significantly reduced, and significant 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 uses a mixture of zinc dialkyl dithiophosphate and molybdenum dithiocarbamate as an antiwear agent, which can significantly improve the tribological properties and detergency and dispersibility of synthetic gasoline engine oil; when a single zinc dithiophosphate is used, the tribological properties are significantly reduced; and the preferred mass ratio of zinc dialkyl dithiophosphate to molybdenum dithiocarbamate is 1:(0.2-0.4).

[0124] 4. Test method for kinematic viscosity at 100°C 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. 40°C kinematic viscosity test method 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] 6. Test method for low temperature dynamic viscosity of the synthetic gasoline engine oil obtained in Example 1: The test was carried out in accordance with the provisions of GB / T6538. The results are shown in Table 2.

[0127] VII. Test method for pour point of synthetic gasoline engine oil obtained in Example 1: The test was carried out in accordance with the provisions of GB / T3535. The results are shown in Table 2.

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

[0129] IX. The test method for the base number of the synthetic gasoline engine oil obtained in Example 1 was carried out in accordance with the provisions of SH / T0251. The results are shown in Table 2.

[0130] 10. Test method for high temperature and high shear viscosity of the synthetic gasoline engine oil obtained in Example 1: The test was carried out in accordance with the provisions of SH / T0703. The results are shown in Table 2.

[0131] 11. Test method for evaporation loss (mass fraction) of the synthetic gasoline engine oil obtained in Example 1: The test was carried out in accordance with the provisions of SH / T 0059. 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: The test was conducted in accordance with the provisions of 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 the 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 this application has low kinematic viscosity and good fluidity; low pour point and low low-temperature dynamic viscosity, indicating good low-temperature fluidity; low evaporation loss and 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 non-creative modifications to the present embodiment as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A synthetic gasoline engine oil, characterized in that: The raw materials 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 polyisobutylenephenol diethylenetriamine Mannich base; 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; The anti-wear agent is a mixture of zinc dialkyl dithiophosphate and molybdenum dithiocarbamate, with a mass ratio of 1: (0.2-0.4); The preparation method of the nonylphenol-modified polyisobutenylphenol diethylenetriamine Mannich base comprises the following steps: The method comprises the following steps: uniformly mixing polyisobutenylphenol diethylenetriamine Mannich base with a portion of solvent oil D-60 to obtain a mixed solution; placing the mixed solution, a 40% by mass formaldehyde solution, the remaining solvent oil D-60, and nonylphenol in a reaction kettle; reacting the mixture at a temperature of 102-110° C. for 4-6 hours; extracting the upper organic phase of the product and removing the solvent oil D-60 component and unreacted nonylphenol by vacuum distillation to obtain nonylphenol-modified polyisobutenylphenol diethylenetriamine Mannich base.

2. A synthetic gasoline engine oil according to claim 1, characterized in that: The raw materials include, by weight, 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 anti-wear agent, and 0.2-0.5 parts of pour point depressant.

3. A synthetic gasoline engine oil according to claim 2, characterized in that: 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 anti-wear agent, and 0.35 parts of pour point depressant.

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

5. The synthetic gasoline engine oil according to claim 1, characterized in that: 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.

6. The synthetic gasoline engine oil according to claim 5, characterized in that: The polyisobutenylphenol diethylenetriamine Mannich base is prepared from the following raw materials in parts by weight: 30-50 parts of polyisobutene, 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.

7. The method for preparing a synthetic gasoline engine oil according to any one of claims 1 to 6, 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, and 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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