An additive effective to improve the oil cleanliness of internal combustion engines

Abstract

This invention relates to the field of diesel engine oil additives, specifically to an additive that can effectively improve the detergency of internal combustion engine oils. The additive comprises: high molecular weight succinimide, monoalkenyl succinimide, high-base-value synthetic calcium sulfonate, and alkylphenol calcium sulfate in a weight ratio of (5-7):(1.6-2.3):(1-2):(1-2). The diesel engine oil additive provided by this invention can balance the oil's base number retention capacity, detergency and dispersibility, and sulfate ash level, ensuring that the engine oil meets the requirements for base number and detergency and dispersibility while maintaining a within-standard ash content.

Description

Technical Field

[0001] This invention relates to the field of diesel engine oil additives, specifically to an additive that can effectively improve the cleaning properties of internal combustion engine oils. Background Technology

[0002] In recent years, with the innovation of engine technology, OEMs have been upgrading their filling and after-sales oils, requiring the use of diesel engine oils with low ash content and long oil change intervals. Currently, all China VI commercial vehicle engine oils are required to have an ash content of no more than 1.0% (mass fraction) to protect the vehicle's after-treatment system.

[0003] High-alkalinity detergents have a large alkali reserve, which can continuously neutralize the oxygen-containing acids produced by the oxidation of lubricating oil and fuel oil during use, preventing them from further oxidizing and condensing, thereby reducing varnish. At the same time, they can also neutralize the sulfur oxides produced by the combustion of sulfur-containing fuels, preventing them from sulfonating the lubricating oil. They can also neutralize carboxylic acids, sulfuric acid, nitric acid, etc. produced after combustion, preventing them from further acting on hydrocarbons. Because they neutralize these inorganic and organic acids, they prevent these acidic substances from corroding the metal parts of the engine.

[0004] While high-alkalinity detergents have a strong acid neutralization ability, they can lead to more carbon deposits in the piston ring grooves of diesel engines, affecting engine performance. In addition, the alkalinity of diesel engine oil in current technology is mainly provided by high-alkalinity detergents. Although adding too much additive can increase the product's alkalinity, it can also result in excessive sulfate ash, which may clog the vehicle's aftertreatment device and have an adverse impact on the environment.

[0005] How to provide a diesel engine oil additive that meets the above requirements, so that the engine oil meets the requirements of alkalinity level and detergency and dispersibility while keeping the ash content within the limit, has become an urgent problem to be solved. Summary of the Invention

[0006] To address the aforementioned technical challenges, this invention is proposed.

[0007] First, the present invention provides an additive for diesel engine oil, comprising:

[0008] The composition consists of high molecular weight succinimide, monoalkenyl succinimide, high-base-value synthetic calcium sulfonate, and alkylphenol sulfide calcium in a weight ratio of (5-7):(1.6-2.3):(1-2):(1-2).

[0009] This invention reveals that by compounding the above four substances in the above proportions, the resulting additive can provide high detergency and dispersibility, while also having a strong base number retention capacity. Under the condition that the ash content of the oil does not exceed the standard and the base number level is qualified, it effectively inhibits the formation of carbon deposits in the piston ring groove of diesel engine, significantly improves the detergency and dispersibility of the oil, and balances the base number retention capacity, detergency and dispersibility, and sulfate ash level of the oil, so that it can meet the relevant regulatory requirements and the usage requirements of long-life diesel engine oils.

[0010] Preferably, the average molecular weight of the high molecular weight succinimide is 900-1200, more preferably 1000-1100.

[0011] Preferably, the weight ratio of the high-alkalinity synthetic calcium sulfonate to calcium alkylphenol sulfide is 1:(0.5-1).

[0012] Preferably, the additive comprises:

[0013] The composition consists of high molecular weight succinimide, monoalkenyl succinimide, high-base-value synthetic calcium sulfonate, and alkylphenol sulfide calcium in a weight ratio of (5-5.5):(1.6-1.8):(1.8-2):(1-1.2).

[0014] In some embodiments, the general structural formula of the high-alkalinity synthetic calcium sulfonate is as follows:

[0015]

[0016] Where the ratio of m to n exceeds 30:1, and R represents an oil-soluble alkyl group;

[0017] The general structural formula of the calcium sulfide alkylphenol is as follows:

[0018]

[0019] Where x = 2 to 3, R represents iC 12 , where n is a positive integer.

[0020] The n value depends on the total base value of the detergent. The n value of high-base-value alkylphenol calcium sulfide is above 30, the n value of medium-base-value alkylphenol calcium sulfide is 10-20, and the n value of low-base-value alkylphenol calcium sulfide is less than 10.

[0021] Preferably, the high-alkalinity synthetic calcium sulfonate is a long-chain alkylbenzene sulfonate.

[0022] Preferably, the long-chain alkyl group in the long-chain alkylbenzene sulfonate has 18 to 25 carbon atoms.

[0023] Preferably, the sulfide alkylphenol calcium is derived from alkylphenol salt type detergents.

[0024] Preferably, the high-alkalinity synthetic calcium sulfonate is derived from at least one of the following detergents: T106 (Jinzhou Kangtai Lubricating Oil Additives Co., Ltd.) or T106B (Wuxi Southern Petroleum Additives Co., Ltd.).

[0025] Preferably, the alkylphenol calcium sulfide is derived from at least one of the following detergents: T121 (Wuxi Southern Petroleum Additives Co., Ltd.), RF1121 (Xinxiang Ruifeng New Materials Co., Ltd.), and T115A (Xinxiang Ruifeng New Materials Co., Ltd.).

[0026] Furthermore, the present invention provides the use of the additives in any of the above embodiments in the preparation of diesel engine oils.

[0027] Furthermore, the present invention provides a diesel engine oil containing the additives described in any of the above embodiments.

[0028] Preferably, the diesel engine oil is API CJ-4 / CK-4 / FA-4 or ACEA E6 / E8 / E9 / E11.

[0029] Preferably, the additive accounts for 6.5% to 9.5% of the mass of the diesel engine oil.

[0030] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0031] This invention provides a diesel engine oil additive that can balance the oil's base number retention, detergency and dispersibility, and sulfate ash level, so that the engine oil meets the base number and detergency and dispersibility requirements while keeping the ash content within acceptable limits. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this invention, not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0033] Unless otherwise specified, the experimental methods used in the following embodiments are conventional methods. Unless otherwise specified, all materials used in this invention are commercially available and known products.

[0034] In the following examples and comparative examples, the base oil is a mixture of HVI Group II 150N and hydrotreated neutral base oil HVI Group II 500N, with a mass ratio of 2:1. The viscosity index improver is an OCP type viscosity index improver manufactured by Chevron Oronide, the pour point depressant is a PAMA type pour point depressant manufactured by Evonik Degussa, the multifunctional agent is ZDDP antioxidant and corrosion inhibitor manufactured by Wuxi Nanfang Company, the antioxidant is a phenolic ester type antioxidant manufactured by Beijing Xingpu Company, and the high molecular weight succinimide has an average molecular weight of 1000. The high base value synthetic calcium sulfonate in the following examples is derived from T106B (Wuxi Nanfang Petroleum Additives Co., Ltd.), and the sulfurized alkylphenol calcium is derived from T121 (Wuxi Nanfang Petroleum Additives Co., Ltd.). The parts in the following examples and comparative examples represent parts by weight.

[0035] Example 1

[0036] This embodiment provides a diesel engine oil additive, which is composed of the following components:

[0037] Five parts of high molecular weight succinimide, 1.6 parts of monoalkenyl succinimide, 2 parts of high-base-value synthetic calcium sulfonate, and 1 part of alkylphenol calcium sulfide;

[0038] Furthermore, this embodiment provides a diesel engine oil composed of the following components:

[0039] The composition includes 78.45 parts base oil, 8.5 parts of the above-mentioned additives, 8.9 parts OCP viscosity index improver, 0.05 parts PAMA pour point depressant, 1.3 parts multifunctional agent, and 2.8 parts antioxidant.

[0040] Example 2

[0041] This embodiment provides a diesel engine oil additive, which is composed of the following components:

[0042] 6 parts of high molecular weight succinimide, 1.9 parts of monoalkenyl succinimide, 1.5 parts of high-base-value synthetic calcium sulfonate, and 1.5 parts of sulfide alkylphenol calcium;

[0043] Furthermore, this embodiment provides a diesel engine oil whose composition differs from that of Embodiment 1 only in that the additives are replaced with those of this embodiment.

[0044] Example 3

[0045] This embodiment provides a diesel engine oil additive, which is composed of the following components:

[0046] 7 parts of high molecular weight succinimide, 2.3 parts of monoalkenyl succinimide, 1 part of high-base-value synthetic calcium sulfonate, and 2 parts of alkylphenol calcium sulfide;

[0047] Furthermore, this embodiment provides a diesel engine oil whose composition differs from that of Embodiment 1 only in that the additives are replaced with those of this embodiment.

[0048] Comparative Example 1

[0049] This comparative example provides an additive for diesel engine oil, the composition of which differs from that of Example 1 only in that:

[0050] Replace the high molecular weight succinimide with an equal amount of poly(ethylene butylene succinate).

[0051] Furthermore, this comparative example provides a diesel engine oil whose composition differs from that of Example 1 only in that the additives are replaced with those of this comparative example.

[0052] Comparative Example 2

[0053] This comparative example provides an additive for diesel engine oil, the composition of which differs from that of Example 1 only in that:

[0054] One part of high molecular weight succinimide, one part of monoalkenyl succinimide, two parts of high-base-value synthetic calcium sulfonate, and two parts of alkylphenol calcium sulfide;

[0055] Furthermore, this comparative example provides a diesel engine oil whose composition differs from that of Example 1 only in that the additives are replaced with those of this comparative example.

[0056] Performance verification of engine oil in experimental cases

[0057] To further verify the performance of the diesel engine oils in the examples and comparative examples, the detergency, base number, and sulfate ash content of the engine oils were verified.

[0058] The physicochemical data of each embodiment and comparative example meet the API CK-4 specification requirements. The test results of detergency, alkalinity and sulfate ash are shown in Table 1.

[0059] Table 1 Performance Verification of Engine Oil

[0060]

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An additive for diesel engine oil, characterized in that, include: The composition of high molecular weight succinimide, monoalkenyl succinimide, high-base-value synthetic calcium sulfonate, and alkylphenol sulfide calcium is (5~5.5):(1.6~1.8):(1.8~2):(1~1.2). The average molecular weight of the high molecular weight succinimide is 900~1200; The high-alkalinity synthetic calcium sulfonate is derived from at least one of the following detergents: T106, T106B; The sulfide alkylphenol calcium is derived from at least one of the following detergents: T121, RF1121, T115A.

2. A diesel engine oil, characterized in that, It contains the additive described in claim 1.

3. The diesel engine oil according to claim 2, characterized in that, The diesel engine oil specifications are APICJ-4 / CK-4 / FA-4 or ACEA E6 / E8 / E9 / E11.

4. The diesel engine oil according to claim 2 or 3, characterized in that, The additive accounts for 6.5% to 9.5% of the mass of the diesel engine oil.

Images