Additive capable of effectively improving cleanliness of internal combustion engine oil

Abstract

The invention relates to the technical field of diesel engine oil additives, in particular to an additive capable of effectively improving the cleanliness of internal combustion engine oil. The additive is prepared from macromolecular succinimide, monoalkenyl succinimide, high-base-number synthetic calcium sulfonate and sulfurized calcium alkyl phenolate according to the weight ratio of (5 to 7) to (1.6 to 2.3) to (1 to 2) to (1 to 2). The diesel engine oil additive provided by the invention can balance the base number retention capability, the detergency and dispersibility and the sulfate ash content level of an oil product, so that the ash content does not exceed the standard while the base number level and the detergency and dispersibility of engine oil are met.

Description

Technical Field

[0001] The invention relates to the technical field of diesel engine oil additives, and in particular to an additive that can effectively improve the detergency of internal combustion engine oil. Background Art

[0002] In recent years, with the innovation of engine technology, various OEM manufacturers have upgraded their filling oil and aftermarket oil, requiring the use of diesel engine oil with low ash content and long oil change period. At present, the engine oil of National VI commercial vehicles requires the use of diesel engine oil with ash content not exceeding 1.0% (mass fraction) to protect the vehicle's after-treatment device.

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

[0004] Although high-base detergents have strong acid neutralization capabilities, they will cause more carbon deposits to form in the diesel engine piston top ring groove, affecting the performance of the engine. At the same time, the base number of diesel engine oil in the prior art is mainly provided by high-base detergents. Although excessive addition of additives can increase the base number of the product, it will also bring about excessive sulfate ash content, which may clog the vehicle's post-processing device and have an adverse impact on the environment.

[0005] How to provide a diesel engine oil additive that can meet the above requirements so that the engine oil does not exceed the ash content standard while meeting the alkalinity level and detergency and dispersibility has become a difficult problem that needs to be solved urgently. Summary of the invention

[0006] In order to solve the above technical problems, the present invention is proposed.

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

[0008] The weight ratio of high molecular weight succinimide, monoolefin succinimide, high base synthetic calcium sulfonate and alkyl phenol calcium sulfide is (5-7): (1.6-2.3): (1-2): (1-2).

[0009] The present invention finds that by compounding the above four substances in the above proportions, the prepared additive can provide high clean dispersibility and strong alkalinity retention ability. While ensuring that the ash content of the oil does not exceed the standard and the alkalinity level is qualified, it can effectively inhibit the carbon deposits generated in the top ring groove of the diesel engine piston, significantly improve the clean dispersibility of the oil, balance the alkalinity retention ability of the oil, clean dispersibility and sulfate ash level, so that it can meet the requirements of relevant regulations and the use requirements of long-life diesel engine oil.

[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 base synthetic calcium sulfonate to the alkyl phenate calcium sulfide is 1:(0.5-1).

[0012] Preferably, the additives include:

[0013] The weight ratio of high molecular weight succinimide, monoolefin succinimide, high base synthetic calcium sulfonate and alkyl phenol calcium sulfide is (5-5.5): (1.6-1.8): (1.8-2): (1-1.2).

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

[0015]

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

[0017] The general structure of the alkyl phenol calcium sulfide is as follows:

[0018]

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

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

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

[0022] Preferably, the carbon number of the long-chain alkyl group in the long-chain alkylbenzene sulfonate is 18-25.

[0023] Preferably, the sulfurized calcium alkylphenate is derived from an alkylphenate type detergent.

[0024] Preferably, the high base synthetic calcium sulfonate is derived from at least one of the following detergents: T106 (Jinzhou Kangtai Lubricant Additive Co., Ltd.), T106B (Wuxi Nanfang Petroleum Additive Co., Ltd.).

[0025] Preferably, the sulfurized alkyl phenate calcium is derived from at least one of the following detergents: T121 (Wuxi Nanfang Petroleum Additive Co., Ltd.), RF1121 (Xinxiang Ruifeng New Materials Co., Ltd.), and T115A (Xinxiang Ruifeng New Materials Co., Ltd.).

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

[0027] Furthermore, the present invention provides a diesel engine oil, which contains the additive in any one of the above embodiments.

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

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

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] The invention provides a diesel engine oil additive, which can balance the base value retention ability, detergency and dispersibility of the oil product and the sulfate ash level, so that the engine oil does not exceed the ash standard while meeting the base value level and detergency. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described clearly and completely below. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

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

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

[0035] Example 1

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

[0037] 5 parts of high molecular weight succinimide, 1.6 parts of monoolefin succinimide, 2 parts of high base synthetic calcium sulfonate and 1 part of alkyl phenol calcium sulfide;

[0038] Furthermore, this embodiment provides a diesel engine oil, which is mixed with the following components:

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

[0040] Example 2

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

[0042] 6 parts of high molecular weight succinimide, 1.9 parts of monoolefin succinimide, 1.5 parts of high base synthetic calcium sulfonate and 1.5 parts of sulfided alkylphenol calcium;

[0043] Furthermore, this embodiment provides a diesel engine oil, the composition of which is different from that of Embodiment 1 only in that the additive is replaced by the additive of this embodiment.

[0044] Example 3

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

[0046] 7 parts of high molecular weight succinimide, 2.3 parts of monoolefin succinimide, 1 part of high base synthetic calcium sulfonate and 2 parts of sulfided alkylphenol calcium;

[0047] Furthermore, this embodiment provides a diesel engine oil, the composition of which is different from that of Embodiment 1 only in that the additive is replaced by the additive of this embodiment.

[0048] Comparative Example 1

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

[0050] The high molecular weight succinimide was replaced by an equal amount of polyethylene butylene succinate.

[0051] Furthermore, this comparative example provides a diesel engine oil, the composition of which is different from that of Example 1 only in that the additive is replaced by the additive of this comparative example.

[0052] Comparative Example 2

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

[0054] 1 part of high molecular weight succinimide, 1 part of monoolefin succinimide, 2 parts of high base synthetic calcium sulfonate and 2 parts of sulfided alkylphenol calcium;

[0055] Furthermore, this comparative example provides a diesel engine oil, the composition of which is different from that of Example 1 only in that the additive is replaced by the additive of this comparative example.

[0056] Experimental example: Engine oil performance verification

[0057] In order to further verify the performance of the diesel engine oils of the examples and comparative examples, the detergency, base number and sulfated ash content of the engine oils were verified respectively.

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

[0059] Table 1 Engine oil performance verification

[0060]

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A diesel engine oil additive, characterized in that: include: The weight ratio of high molecular weight succinimide, monoolefin succinimide, high base synthetic calcium sulfonate and alkyl phenol calcium sulfide is (5-7): (1.6-2.3): (1-2): (1-2).

2. The additive according to claim 1, characterized in that The weight ratio of the high base synthetic calcium sulfonate to the alkyl phenol calcium sulfide is 1: (0.5-1).

3. The additive according to claim 1, characterized in that include: The weight ratio of high molecular weight succinimide, monoolefin succinimide, high base synthetic calcium sulfonate and alkyl phenol calcium sulfide is (5-5.5): (1.6-1.8): (1.8-2): (1-1.2).

4. The additive according to claim 1, characterized in that The general structural formula of the overbased synthetic calcium sulfonate is as follows: wherein the ratio of m to n exceeds 30:1, and R represents an oil-soluble alkyl group; The general structure of the alkyl phenol calcium sulfide is as follows: Where x = 2 to 3, R represents iC 12 , n is a positive integer.

5. The additive according to claim 1, characterized in that The high base synthetic calcium sulfonate is a long-chain alkylbenzene sulfonate.

6. The additive according to claim 1, characterized in that The sulfurized calcium alkylphenate is derived from an alkylphenate type detergent.

7. The additive according to claim 1, characterized in that The overbased synthetic calcium sulfonate is derived from at least one of the following detergents: T106, T106B.

8. The additive according to claim 1, characterized in that The sulfurized calcium alkylphenate is derived from at least one of the following detergents: T121, RF1121, and T115A.

9. A diesel engine oil, characterized in that: It contains the additive according to any one of claims 1 to 8; preferably, the specification of the diesel engine oil is API CJ-4 / CK-4 / FA-4 or ACEA E6 / E8 / E9 / E11.

10. The diesel engine oil according to claim 9, characterized in that The additive accounts for 6.5-9.5% by mass of the diesel engine oil.

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