Two-stroke engine oil composition and preparation method thereof

Abstract

The invention discloses a two-stroke engine oil composition which comprises the following components in percentage by mass: 22.00%-83.25% of combined base oil, 10.00%-30.00% of a viscosity index improver, 5.00%-25.00% of diluent oil, 1.00%-15.00% of butadiene imine, 0.50%-5.00% of petroleum calcium sulfonate, 0.05%-1.00% of sulfurized calcium alkyl phenolate, 0.10%-1.00% of diphenylamine and 0.10%-1.00% of a poly-alpha olefin pour point depressant. The sum of the mass percentages of the components is 100%. The invention also discloses a preparation method of the two-stroke engine oil composition, which comprises the following steps: adding the two-stroke engine oil composition into a stainless steel blending kettle with a stirrer, adding the viscosity index improver, the diluent oil, the butadiene imine, the detergent, the diphenylamine and the poly-alpha-olefin pour point depressant into the combined base oil, and stirring for reaction to obtain the two-stroke engine oil composition. The two-stroke engine oil composition has excellent low-temperature performance, high-temperature detergency, high-temperature oxidation resistance and the like, and can meet the use requirements of engines in medium and original areas and extremely cold areas.

Description

Technical Field

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

[0002] In order to adapt to the increasingly stringent environmental regulations to reduce emissions, two-stroke engine technology has made new developments. First, the lubrication method of the two-stroke engine has changed from the original premixed combustion lubrication to separate lubrication, that is, the cylinder wall is lubricated or sprayed to the bottom of the cylinder to be lubricated by the piston. Different from premixed combustion lubrication, the combination must have excellent pumping performance to ensure that the lubricant can reach the lubrication parts smoothly; secondly, the two-stroke engine adopts low-pressure direct injection technology, which has better combustion and higher combustion chamber temperature, so the high-temperature lubrication and high-temperature detergency performance of the lubricant are required to be higher.

[0003] Chinese patent CN201710270904X discloses a two-stroke engine oil composition and a preparation method thereof, comprising a polyetheramine compound, an ashless friction modifier and a balance of lubricating base oil. The two-stroke engine oil composition has very excellent antioxidant, anti-wear and detergency, and fully meets the requirements of JASO#FC and FD specification engine oils.

[0004] Chinese patent CN201310146837.2 provides a composition comprising a Mannich base, an ashless friction modifier and a lubricating oil base oil, which has excellent cleaning and dispersing properties and friction reducing properties, and fully meets the requirements of JASO FC and FD specifications for two-stroke engine oils.

[0005] Chinese patent CN201110455611.1 discloses a novel FC two-stroke gasoline engine oil composed of a composition of dolomite, chromium oxide and polyethylene glycol, and a preparation method and application thereof, which is particularly suitable for lubricating various air-cooled two-stroke gasoline engine oil vehicles or machines.

[0006] Chinese patent CN99118372.X relates to a diluent composition for two-stroke engine lubricating oil, which comprises a mixture in which the content of dicyclic or higher polycyclic aromatic hydrocarbons is 1.0% (volume) or less, the content of sulfur is 0.015% (weight) or less, and the distillation end point is at most 320°C.

[0007] Chinese patent CN96198526.7 proposes a two-stroke engine oil, which contains industrial grade pentaerythritol ester, polybutene, a normal liquid solvent with a boiling point of up to 300°C, and 0-5% of other lubricant additives.

[0008] Chinese patent CN96198499.6 discloses an ester two-stroke engine oil composition, which contains two kinds of synthetic ester base oils, polybutene polymer, normal liquid solvent (boiling point up to 300°C, flash point 60-120°C); oil-soluble copper-containing compound; and other lubricant additives.

[0009] None of the above invention patents mention the marginal pumping performance and high temperature oxidation resistance of two-stroke engine oils, nor do they mention the actual use test of product performance on direct injection engines. Summary of the invention

[0010] The object of the present invention is to provide a two-stroke engine oil composition having the characteristics of high-temperature lubrication performance and high-temperature detergency.

[0011] Another object of the present invention is to provide a method for preparing the above two-stroke engine oil composition, which has the characteristic of simple operation.

[0012] The technical solution adopted by the present invention is that the two-stroke engine oil composition comprises the following components in terms of mass percentage: 5.00%-25% of synthetic base oil, 17.00%-58.25% of mineral base lubricating oil, 10.00%-30.00% of viscosity index improver, 5.00%-25.00% of diluent oil, 1.00%-15.00% of butadiene imine, 0.55%-6.00% of detergent, 0.10%-1.00% of diphenylamine, and 0.10%-1.00% of poly-alpha olefin pour point depressant, and the sum of the mass percentages of the above components is 100%.

[0013] The present invention is also characterized in that:

[0014] The viscosity index improver is polyisobutylene, and the molecular weight of polyisobutylene is 900-1300.

[0015] The diluent oil is kerosene or diesel.

[0016] The detergent is a mixture of petroleum calcium sulfonate and alkyl phenol calcium sulfide. The detergent comprises the following components in terms of mass percentage: 83.33%-90.90% of petroleum calcium sulfonate and 9.10%-16.67% of alkyl phenol calcium sulfide, and the sum of the mass percentages of the above components is 100%.

[0017] Another technical solution adopted by the present invention is a method for preparing a two-stroke engine oil composition, which specifically comprises: Step 1, weighing the following raw materials respectively by mass percentage:

[0018] Combined base oil 22.00%-83.25%, viscosity index improver 10.00%-30.00%, diluent oil 5.00%-25.00%, butadiene imine 1.00%-15.00%, petroleum calcium sulfonate 0.50%-5.00%, sulfonated alkylphenol calcium 0.05%-1.00%, diphenylamine 0.10%-1.00%, poly-alpha olefin pour point depressant 0.10%-1.00%, the sum of the mass percentages of the above components is 100%;

[0019] Step 2: Add the combined base oil into a stainless steel blending kettle with a stirrer, and add the viscosity index improver, diluent oil, butadiene imine, detergent, diphenylamine and poly-α-olefin pour point depressant into the combined base oil, and stir to react to obtain a two-stroke engine oil composition.

[0020] The present invention is also characterized in that the viscosity index improver is polyisobutylene, and the molecular weight of the polyisobutylene is 900-1300.

[0021] The diluent oil is kerosene or diesel.

[0022] The detergent is a mixture of petroleum calcium sulfonate and alkyl phenol calcium sulfide. The detergent comprises the following components in terms of mass percentage: 83.33%-90.90% of petroleum calcium sulfonate and 9.10%-16.67% of alkyl phenol calcium sulfide, and the sum of the mass percentages of the above components is 100%.

[0023] The beneficial effects of the present invention are as follows: the two-stroke engine oil composition of the present invention has excellent low-temperature performance, high-temperature detergency, high-temperature antioxidant performance and the like, which meets the high and low temperature performance requirements of the engine in the Central Plains and extremely cold regions, and ensures the smooth movement of the equipment. DETAILED DESCRIPTION

[0024] The present invention is described in detail below in conjunction with specific implementation modes.

[0025] The two-stroke engine oil composition of the present invention is composed of the following raw material components in terms of mass percentage:

[0026] Synthetic base oil 5.00%-25%, mineral base lubricating oil 17.00%-58.25%, viscosity index improver 10.00%-30.00%, diluent oil 5.00%-25.00%, butadiene imine 1.00%-15.00%, calcium petroleum sulfonate 0.50%-5.00%, sulfonated alkylphenol calcium 0.05%-1.00%, diphenylamine 0.10%-1.00%, poly-alpha-olefin pour point depressant 0.10%-1.00%, and the sum of the mass percentages of the above components is 100%.

[0027] The viscosity index improver is polyisobutylene with good smoke exhaust performance, and the molecular weight of polyisobutylene is 900-1300;

[0028] The diluent oil is kerosene or diesel. After the lubricating oil is blended with the diluent oil, the low-temperature performance of the oil is better, the spraying is more uniform, and the lubrication effect is more effective;

[0029] Detergents: Calcium petroleum sulfonate and calcium alkyl phenol sulfide are detergents. Calcium petroleum sulfonate has calcium sulfonate components and a certain alkalinity value, which can play the role of neutralization, dispersion, and rust prevention. Calcium alkyl phenol sulfide has good alkalinity retention and can effectively reduce piston carbon deposits.

[0030] The main formulas of the two-stroke engine oil composition of the present invention play the following roles:

[0031] Viscosity index improver: Polyisobutylene is used. Polyisobutylene has good smoke exhaust performance when used in two-stroke engine oil.

[0032] Diluent oil: Use kerosene or diesel. After the lubricating oil is blended with diluent oil, the low-temperature performance of the oil will be better, it can be sprayed more evenly, and it will play a more effective lubrication role.

[0033] Butadiene imine: Butadiene imine is a dispersant. Butadiene imine has good thermal stability and good dispersing effect.

[0034] Detergents: Calcium petroleum sulfonate and calcium alkylphenol sulfide. Calcium petroleum sulfonate has calcium sulfonate components and a certain alkalinity value, which can play the role of neutralization, dispersion, and rust prevention. It has excellent compatibility with a variety of functional agents. Calcium alkylphenol sulfide has good alkalinity retention and can effectively reduce piston carbon deposits.

[0035] Diphenylamine: Diphenylamine is an antioxidant with outstanding antioxidant properties.

[0036] The preparation method of the two-stroke engine oil composition of the present invention is specifically implemented according to the following steps:

[0037] Step 1: Weigh the following raw materials by mass percentage:

[0038] Combined base oil 22.00%-83.25%, viscosity index improver 10.00%-30.00%, diluent oil 5.00%-25.00%, butadiene imine 1.00%-15.00%, petroleum calcium sulfonate 0.50%-5.00%, sulfonated alkylphenol calcium 0.05%-1.00%, diphenylamine 0.10%-1.00%, poly-alpha olefin pour point depressant 0.10%-1.00%, the sum of the mass percentages of the above components is 100%;

[0039] Step 2: Add the combined base oil into a stainless steel blending kettle with a stirrer, and add the viscosity index improver, diluent oil, butadiene imine, detergent, diphenylamine and poly-α-olefin pour point depressant into the combined base oil, and stir to react to obtain a two-stroke engine oil composition.

[0040] Embodiment 1:

[0041] Table 1 Example 1 Two-stroke engine oil composition and ratio

[0042] name quality% Polyisobutylene 30 Diluent Oil 15 Butadiene imine 5.0 Calcium petroleum sulfonate 0.5 Calcium alkyl phenol sulfide 0.3 Diphenylamine 0.3 Polyalphaolefin 0.2 HVIP8 margin PAO6 5

[0043] The performance test of the two-stroke engine oil for low-pressure direct injection separation lubrication prepared in this embodiment is shown in Table 2.

[0044] Table 2 Performance data of two-stroke engine oil in Example 1

[0045]

[0046] Embodiment 2:

[0047] Table 3 Composition and proportion of two-stroke engine oil in Example 2

[0048] name quality% Polyisobutylene 30 Diluent Oil 20 Butadiene imine 5.0 Calcium petroleum sulfonate 0.6 Calcium alkyl phenol sulfide 0.2 Diphenylamine 0.5 Polyalphaolefin 0.4 HVIP8 margin PAO 6 20.0

[0049] The performance test of the two-stroke engine oil for low-pressure direct injection separation lubrication prepared in this embodiment is shown in Table 4.

[0050] Table 4 Performance data of two-stroke engine oil in Example 2

[0051]

[0052]

[0053] Embodiment 3:

[0054] Table 5 Composition and proportion of two-stroke engine oil in Example 3

[0055] name quality% Polyisobutylene 30 Diluent Oil 15 Butadiene imine 5.0 Calcium petroleum sulfonate 0.6 Calcium alkyl phenol sulfide 0.2 Diphenylamine 0.5 Polyalphaolefin 0.4 HVIP8 margin PAO 6 25.0

[0056] The performance test of the two-stroke engine oil for low-pressure direct injection separation lubrication prepared in this embodiment is shown in Table 6.

[0057] Table 6 Performance data of two-stroke engine oil in Example 3

[0058]

[0059]

[0060] Embodiment: 4:

[0061] Table 7 Composition and proportion of two-stroke engine oil in Example 4

[0062] name quality% Polyisobutylene 30 Diluent Oil 25 Butadiene imine 1.0 Calcium alkyl phenol sulfide 0.55 Diphenylamine 0.1 Polyalphaolefin 0.1 HVIP8 margin PAO6 5

[0063] The performance test of the two-stroke engine oil for low-pressure direct injection separation lubrication prepared in this embodiment is shown in Table 6.

[0064] Table 8 Performance data of two-stroke engine oil in Example 4

[0065]

[0066] Embodiment 5:

[0067] Table 9 Composition and proportion of two-stroke engine oil in Example 5

[0068]

[0069]

[0070] The performance test of the two-stroke engine oil for low-pressure direct injection separation lubrication prepared in this embodiment is shown in Table 10.

[0071] Table 10 Performance data of two-stroke engine oil in Example 5

[0072]

[0073] According to the embodiment table 2, table 4, table 6, table 8, table 10 in the table, the kinematic viscosity at 100°C is 7.21-9.25 according to the GB / T265 standard, which means that the low temperature fluidity of the present application is good;

[0074] According to GB / T3535 standard, the pour point test is -42℃—-32℃, which means that the application has excellent low-temperature fluidity;

[0075] According to GB / T 2433 standard, its sulfate ash test is 0.06-0.14, which means it has good high-temperature detergency and can effectively reduce the tendency of engine pre-ignition caused by sediment;

[0076] According to GB / T 6538 standard, the low temperature dynamic viscosity test at -25℃ is 4610mPa·s-6160mPa·s, indicating good cold start performance.

[0077] According to NB / SH / T 0562 standard, the low temperature pumping viscosity test is 8500mPa·s-24500mPa·s at -30℃, which means it has good low temperature pumping performance.

[0078] In summary, the two-stroke engine oil composition of the present invention has excellent low-temperature performance, high-temperature detergency, high-temperature antioxidant performance and good cold start performance, and meets the high and low temperature performance requirements of the engine in the Central Plains and extremely cold regions.

Claims

1. A two-stroke engine oil composition, characterized in that: The invention comprises the following components in percentage by mass: 5.00%-25% of synthetic base oil, 17.00%-58.25% of mineral base lubricating oil, 10.00%-30.00% of viscosity index improver, 5.00%-25.00% of diluent oil, 1.00%-15.00% of butadiene imine, 0.55%-6.00% of detergent, 0.10%-1.00% of diphenylamine and 0.10%-1.00% of poly-alpha-olefin pour point depressant. The sum of the percentages by mass of the above components is 100%.

2. The two-stroke engine oil composition according to claim 1, characterized in that The viscosity index improver is polyisobutylene, and the molecular weight of the polyisobutylene is 900-1300.

3. The two-stroke engine oil composition according to claim 1, characterized in that: The diluent oil is kerosene or diesel.

4. The two-stroke engine oil composition according to claim 1, characterized in that: The detergent is a mixture of petroleum calcium sulfonate and alkyl phenol calcium sulfide, and comprises the following components in terms of mass percentage: 83.33%-90.90% of petroleum calcium sulfonate and 9.10%-16.67% of alkyl phenol calcium sulfide, and the sum of the mass percentages of the above components is 100%.

5. A method for preparing a two-stroke engine oil composition, using the two-stroke engine oil composition according to claim 1, characterized in that: The method comprises the following steps: Step 1, weighing the following raw materials respectively by mass percentage: Combined base oil 22.00%-83.25%, viscosity index improver 10.00%-30.00%, diluent oil 5.00%-25.00%, butadiene imine 1.00%-15.00%, petroleum calcium sulfonate 0.50%-5.00%, sulfonated alkylphenol calcium 0.05%-1.00%, diphenylamine 0.10%-1.00%, poly-alpha olefin pour point depressant 0.10%-1.00%, the sum of the mass percentages of the above components is 100%; Step 2: Add the combined base oil into a stainless steel blending kettle with a stirrer, and add the viscosity index improver, diluent oil, butadiene imine, detergent, diphenylamine and poly-α-olefin pour point depressant into the combined base oil, and stir to react to obtain a two-stroke engine oil composition.

6. The method for preparing a two-stroke engine oil composition according to claim 5, characterized in that: The viscosity index improver is polyisobutylene, and the molecular weight of the polyisobutylene is 900-1300.

7. The method for preparing a two-stroke engine oil composition according to claim 5, characterized in that: The diluent oil is kerosene or diesel.

8. The method for preparing a two-stroke engine oil composition according to claim 5, characterized in that: The detergent is a mixture of petroleum calcium sulfonate and alkyl phenol calcium sulfide, and comprises the following components in terms of mass percentage: 83.33%-90.90% of petroleum calcium sulfonate and 9.10%-16.67% of alkyl phenol calcium sulfide, and the sum of the mass percentages of the above components is 100%.

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