Gas engine oil composition as well as preparation method and application thereof

Abstract

The invention discloses a gas engine oil composition as well as a preparation method and an application thereof. The gas engine oil composition comprises the following components in percentage by weight: 70.7-72.5% of III-type base oil, 0.1-0.5% of an antioxidant, 0.1-0.5% of a lubricant and 0.1-0.5% of a lubricant. 11.5 to 11.8% of a composite additive; 13 to 13.5 percent of a viscosity index improver; 2-3% of a base number improver; 0.5-1% of a base number retention agent; and 0.2-0.3% of a pour point depressant. According to the invention, the ash-free base number increasing agent and the base number keeping agent are added and have a synergistic effect, so that the base number of the gas engine oil is effectively increased, the problem that the base number is quickly reduced is solved, and abnormal phenomena such as engine hardware abrasion and corrosion caused by too quick base number attenuation in the use process are avoided; the low-ash-content high-base-number oil-change additive has the characteristics of low ash content, high base number and slow base number attenuation, can meet the requirement of 120 thousand kilometer long oil change mileage, effectively prolongs the oil change period of oil products, and reduces the use cost of the oil products.

Description

Technical Field

[0001] The present invention belongs to lubricating oil, and in particular relates to a gas engine oil composition, a preparation method and an application thereof. Background Art

[0002] Compared with ordinary gasoline and diesel engines, commercial vehicle gas engines have their own characteristics: gas engine oil has a high combustion temperature, increased heat load, and increased production of nitrogen oxides. The generated nitrogen oxides are incorporated into the engine oil, increasing the acid content of the lubricating oil, causing the base value to drop too quickly. This is also the reason why the oil change cycle of gas engine oil is shorter than that of ordinary engine oil. Summary of the Invention

[0003] Purpose of the Invention: The purpose of the present invention is to provide a gas engine oil composition that, by using a base number increaser and a base number retainer to act synergistically, solves the technical problem of rapid decrease in base number during use of gas engine oil, while also extending the oil change cycle. Another purpose of the present invention is to provide a method for preparing the gas engine oil composition and its application in the lubrication of gas commercial vehicle engines.

[0004] Technical solution: The gas engine oil composition of the present invention comprises the following components by weight percentage: 70.7-72.5% of Group III base oil; 11.5-11.8% of composite additives; 13-13.5% of viscosity index improver; 2-3% of base number enhancer; 0.5-1% of base number retainer; and 0.2-0.3% of pour point depressant.

[0005] Preferably, the base value increasing agent is octylbutyldiphenylamine, and the base value is 150 to 200 mgKOH / g.

[0006] More preferably, the base value is 180 mgKOH / g.

[0007] Preferably, the base value maintaining agent is 3,5-di-tert-butyl-4-hydroxyphenylpropionate.

[0008] Preferably, the weight ratio of the alkalinity increasing agent to the alkalinity maintaining agent is (2-3): (0.5-1).

[0009] Preferably, the kinematic viscosity of the Group III base oil at 100°C is between 5.8 and 6.5 mm 2 / s.

[0010] Further preferably, the Group III base oil is 150N.

[0011] Preferably, the composite additive is a high-performance gas engine oil composite that meets the Cummins gas engine oil CES20092 specification requirements.

[0012] Preferably, the viscosity index improver is ethylene propylene copolymer, with SSI < 25.

[0013] More preferably, the viscosity index improver is Lubrizol LZ7077, with a kinematic viscosity of 600-700 mm at 100°C. 2 / s.

[0014] Preferably, the pour point depressant is acrylate polymer 1-300, 1-248 or 1-254.

[0015] The preparation method of the gas engine oil composition of the present invention comprises the following steps: adding base oil, viscosity index improver, and pour point depressant into a lubricating oil kettle according to a formula ratio, stirring, heating to 58-62° C., and stirring at 58-62° C. for 1-1.5 hours; adding composite additives, base value improver, and base value reinforcing agent, stirring at 58-62° C. for 30-40 minutes, to obtain a gas engine oil lubricant.

[0016] Application of the gas engine oil composition of the present invention in lubricating gas commercial vehicle engines.

[0017] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages: 1. By adding an ashless alkalinity increaser and an alkalinity retainer and making them work synergistically, the alkalinity of the gas engine oil is effectively increased, the problem of rapid alkalinity drop is solved, and abnormal phenomena such as engine hardware wear and corrosion caused by excessive alkalinity decay during use are avoided; 2. It has the characteristics of low ash content and high alkalinity, and the alkalinity decays slowly, which can meet the oil change mileage requirement of 120,000 kilometers, effectively extend the oil change cycle, and reduce the cost of oil use. DETAILED DESCRIPTION

[0018] 1. The technical solution of the present invention will be further described below with reference to embodiments.

[0019] The raw materials used in the present invention can be purchased from the market. The composite additive 1 is Infineum M7286, and the composite additive 2 is Chevron OLOA55600.

[0020] Example 1

[0021] 72.5 kg of Class III base oil; 11.8 kg of composite additive 1; 13 kg of viscosity index improver LZ7077; 2 kg of base value improver octylbutyl diphenylamine; 0.5 kg of base value maintaining agent 3,5-di-tert-butyl-4-hydroxyphenylpropionate; and 0.2 kg of pour point depressant 1-300.

[0022] Example 2

[0023] 70.9 kg of Class III base oil; 11.8 kg of composite additive 1; 13 kg of viscosity index improver LZ7077; 3 kg of base value improver octylbutyl diphenylamine; 1 kg of base value maintaining agent 3,5-di-tert-butyl-4-hydroxyphenylpropionate; and 0.3 kg of pour point depressant 1-300.

[0024] Example 3

[0025] 72.3 kg of Class III base oil; 11.5 kg of composite additive 2; 13.5 kg of viscosity index improver LZ7077; 2 kg of base value improver octylbutyl diphenylamine; 0.5 kg of base value maintaining agent 3,5-di-tert-butyl-4-hydroxyphenylpropionate; and 0.2 kg of pour point depressant 1-248.

[0026] Example 4

[0027] 70.7 kg of Class III base oil; 11.5 kg of composite additive 2; 13.5 kg of viscosity index improver LZ7077; 3 kg of base value improver octylbutyl diphenylamine; 1 kg of base value maintaining agent 3,5-di-tert-butyl-4-hydroxyphenylpropionate; and 0.3 kg of pour point depressant 1-254.

[0028] Comparative Example 1

[0029] 75kg of Class III base oil; 11.8kg of composite additive 1; 13kg of viscosity index improver LZ7077; and 0.2kg of pour point depressant 1-300.

[0030] Comparative Example 2

[0031] 73 kg of Class III base oil; 11.8 kg of composite additive 1; 13 kg of viscosity index improver LZ7077; 3 kg of base value improver octylbutyl diphenylamine; and 0.2 kg of pour point depressant 1-300.

[0032] Comparative Example 3

[0033] 73.4 kg of Class III base oil; 11.8 kg of composite additive 1; 13 kg of viscosity index improver LZ7077; 1.5 kg of base value maintaining agent 3,5-di-tert-butyl-4-hydroxyphenylpropionic acid isooctyl ester; and 0.2 kg of pour point depressant 1-300.

[0034] Comparative Example 4

[0035] 74.8 kg of Class III base oil; 11.5 kg of composite additive 2; 13.5 kg of viscosity index improver LZ7077; and 0.2 kg of pour point depressant 1-300.

[0036] Comparative Example 5

[0037] 72.8 kg of Class III base oil; 11.5 kg of composite additive 2; 13.5 kg of viscosity index improver LZ7077; 2 kg of base value improver octylbutyl diphenylamine; 1.5 kg of base value maintaining agent 3,5-di-tert-butyl-4-hydroxyphenylpropionate; and 0.2 kg of pour point depressant 1-300.

[0038] Comparative Example 6

[0039] 70.2 kg of Class III base oil; 11.5 kg of composite additive 2; 13.5 kg of viscosity index improver LZ7077; 3 kg of base value improver octylbutyl diphenylamine; and 0.2 kg of pour point depressant 1-300.

[0040] Comparative Example 7

[0041] 69.2 kg of Class III base oil; 11.5 kg of composite additive 2; 13.5 kg of viscosity index improver LZ7077; 4 kg of base value improver octylbutyl diphenylamine; and 0.2 kg of pour point depressant 1-300.

[0042] Table 1 Composition of Examples 1 to 4

[0043]

[0044] Table 2 Composition of Comparative Examples 1 to 7

[0045]

[0046]

[0047] 2. The oils prepared in the above proportions were subjected to aging performance tests (180°C, 168h). After the aging test, the lower the alkalinity value, the worse the oil's anti-oxidation and nitration performance. The data are shown in Tables 3 and 4.

[0048] Table 3 Physical and chemical properties test data of Examples 1 to 4

[0049]

[0050] Table 4 Physical and chemical performance test data of comparative examples 1 to 7

[0051]

[0052]

[0053] The data in Tables 3 and 4 show that the base number increasers in Examples 1 to 4 and the comparative example can increase the base number. In the absence of a base number retaining agent, the base number of the aged oil decreases rapidly. It can be seen that when both the base number increaser and the base number retaining agent are present, the two can work synergistically with each other to effectively slow down the problem of the oil base number decreasing too quickly.

[0054] 3. The embodiments and comparative examples were respectively subjected to driving tests on a National VI gas generator vehicle to check the changes in their alkalinity values, as shown in Tables 5 and 6.

[0055] Table 5 Alkali value data of used oil in driving test of Examples 1 to 4

[0056]

[0057] Table 6 Alkali value data of used oil in driving test of Comparative Examples 1 to 7

[0058]

[0059] As can be seen from the data in Tables 5-6, after the driving test, samples were taken for testing. In Comparative Examples 1-2, 5-7, the base number dropped too quickly, and the driving test was stopped prematurely. It is clear that in Examples 1-4, Comparative Example 3, and Comparative Example 6, the base number of the oil product decayed slowly when both the base number increaser and the base number retainer were present, effectively suppressing the formation of acidic substances and extending the oil change cycle.

Claims

1. A gas engine oil composition, characterized in that: The invention comprises the following components by weight percentage: 70.7-72.5% of Class III base oil; 11.5-11.8% of composite additives; 13-13.5% of viscosity index improver; 2-3% of base value enhancer; 0.5-1% of base value retainer; and 0.2-0.3% of pour point depressant.

2. The gas engine oil composition according to claim 1, characterized in that: The base value increasing agent is octylbutyldiphenylamine, and the base value is 150-200 mgKOH / g.

3. The gas engine oil composition according to claim 1, characterized in that: The base value maintaining agent is 3,5-di-tert-butyl-4-hydroxyphenylpropionate.

4. The gas engine oil composition according to claim 1, characterized in that: The weight ratio of the alkalinity increasing agent to the alkalinity maintaining agent is (2-3): (0.5-1).

5. The gas engine oil composition according to claim 1, characterized in that: The kinematic viscosity of the Class III base at 100°C is 5.8-6.5 mm 2 / s.

6. The gas engine oil composition according to claim 1, characterized in that: The composite additive is a high-performance gas engine oil composite additive that meets the Cummins gas engine oil CES20092 specification requirements.

7. The gas engine oil composition according to claim 1, characterized in that: The viscosity index improver is ethylene propylene copolymer, and the SSI is less than 25.

8. The gas engine oil composition according to claim 1, characterized in that: The pour point depressant is acrylate polymer 1-300, 1-248 or 1-254.

9. A method for preparing the gas engine oil composition according to claim 1, characterized in that: The following steps are involved: The base oil, viscosity index improver and pour point depressant are added into a lubricating oil kettle according to the formula ratio, stirred, heated to 58-62° C., and stirred at 58-62° C. for 1-1.5 hours; the composite additive, base value improver and base value reinforcing agent are added, stirred at 58-62° C. for 30-40 minutes to obtain a gas engine oil lubricant.

10. Use of the gas engine oil composition according to claim 1 in lubricating a gas commercial vehicle engine.

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