阅读说明：本技术 一种耐低温柴油发动机油组合物 (Low-temperature-resistant diesel engine oil composition ) 是由 金佳佳 王向阳 黄海鹏 雷凌 鄂红军 陈钊锋 赵佳洋 孙瑞雨 于 2019-10-14 设计创作，主要内容包括：本发明涉及柴油发动机油技术领域,具体涉及一种耐低温柴油发动机油组合物。本发明提供的柴油发动机油组合物包括如下重量份的组分：基础油50～80份,柴油发动机油复合剂10～15份,黏度指数改进剂10～20份,降凝剂0.1～0.5份；所述黏度指数改进剂为HSD型黏度指数改进剂；所述降凝剂包含烷基萘和/或聚甲基丙烯酸酯。该柴油发动机油组合物能够满足CH-4 0W-30和CF-4 0W-40规格要求,具有优异的耐低温性能,在低温环境中能够保证柴油发动机的正常运行,特别适用于高寒地区、寒冷季节的柴油发动机使用。(The invention relates to the technical field of diesel engine oil, in particular to a low-temperature-resistant diesel engine oil composition. The diesel engine oil composition provided by the invention comprises the following components in parts by weight: 50-80 parts of base oil, 10-15 parts of a diesel engine oil complexing agent, 10-20 parts of a viscosity index improver and 0.1-0.5 part of a pour point depressant; the viscosity index improver is an HSD type viscosity index improver; the pour point depressant comprises alkyl naphthalene and/or polymethacrylate. The diesel engine oil composition can meet the specification requirements of CH-40W-30 and CF-40W-40, has excellent low-temperature resistance, can ensure the normal operation of a diesel engine in a low-temperature environment, and is particularly suitable for the diesel engine in alpine regions and cold seasons.)

1. The low-temperature-resistant diesel engine oil composition is characterized by comprising the following components in parts by weight: 50-80 parts of base oil, 10-15 parts of a diesel engine oil complexing agent, 10-20 parts of a viscosity index improver and 0.1-0.5 part of a pour point depressant;

the viscosity index improver is an HSD type viscosity index improver; the pour point depressant comprises alkyl naphthalene and/or polymethacrylate.

2. The diesel engine oil composition of claim 1, wherein the engine oil composition meets CH-4 specification requirements, including a viscosity grade of 0W-30, in the range of: 9.3<Viscosity is less than or equal to 12.5mm²S; alternatively, the engine oil composition meets the CF-4 specification requirements, including a viscosity grade of 0W-40, the viscosity range being: 12.5<Viscosity is less than or equal to 16.3mm²/s。

3. The diesel engine oil composition according to claim 1 or 2, wherein the mass ratio of the viscosity index improver to the pour point depressant in the diesel engine oil composition is (20-200): 1; preferably (20-60): 1.

4. the diesel engine oil composition as defined in any one of claims 1 to 3, wherein the pour point depressant is a polymethacrylate-type pour point depressant; preferably, the pour point depressant is Vx 1-248; the HSD type viscosity index improver is VII-260.

5. The diesel engine oil composition as defined in any one of claims 1 to 4, wherein the base oil is a mixture of a group V base oil and a group IV base oil, or a mixture of a group IV base oil and a group III base oil.

6. The diesel engine oil composition according to any one of claims 1 to 5, wherein the mass ratio of the group IV base oil to the group V base oil or the group III base oil in the base oil is (2 to 5): 1.

7. The diesel engine oil composition as defined in any one of claims 1 to 6, wherein the diesel engine oil complex meets CH-4 or CF-4 quality requirements; preferably Lz4980A, or a mixture of Lz4980A and Lz 8680A.

8. The diesel engine oil composition according to any one of claims 1 to 7, comprising the following components in parts by weight:

9. the diesel engine oil composition according to any one of claims 1 to 7, comprising the following components in parts by weight:

Technical Field

The invention relates to the technical field of diesel engine oil, in particular to a low-temperature-resistant diesel engine oil composition.

Background

The engine oil plays roles of lubrication, antifriction, cooling, noise reduction, vibration reduction, cleaning, sealing, rust prevention, corrosion prevention and the like in the using process of the engine. The engine works under the harsh conditions of high thermal load and high mechanical load, so the engine oil has good lubricity, good oxidation stability, good wear resistance and friction reduction, good corrosion resistance and rust resistance, good viscosity-temperature property, good low-temperature fluidity, good pumpability, cleaning dispersibility and the like.

In order to ensure the lubricating effect of the engine, the engine oil needs to have proper viscosity and good viscosity-temperature characteristics, so that the viscosity is slightly influenced by temperature change. The excessive viscosity of the lubricating oil can increase the motion resistance between friction pairs, the low-temperature starting is difficult, the mechanical efficiency is reduced, and the fuel consumption is increased. And the viscosity is too low, a tough oil film cannot be formed between the friction pairs, the antifriction effect is poor, and the abrasion of the engine is increased. Diesel engines are often required to operate under high load for a long period of time in low-temperature environments such as cold regions and cold seasons, and therefore the low-temperature resistance of engine oil is highly required. And the requirement of the current environmental protection laws and regulations on the engine oil is stricter, and the high-quality low-sulfur, low-phosphorus and low-ash engine oil is widely popularized. Therefore, there is a need to develop a diesel engine oil having excellent low temperature resistance that meets strict environmental standards.

Disclosure of Invention

The invention aims to provide a diesel engine oil composition with excellent low-temperature resistance.

In order to achieve the purpose, the technical scheme of the invention is as follows:

the invention provides a low-temperature-resistant diesel engine oil composition which comprises the following components in parts by weight: 50-80 parts of base oil, 10-15 parts of a diesel engine oil complexing agent, 10-20 parts of a viscosity index improver and 0.1-0.5 part of a pour point depressant; wherein the viscosity index improver is an HSD type viscosity index improver; the pour point depressant comprises alkyl naphthalene and/or polymethacrylate. The low-temperature resistance of the diesel engine oil can be better ensured by adopting the compounding mode of the viscosity index improver and the pour point depressant.

The HSD type viscosity index improver is preferably dissolved using a group III base oil.

As one of the parallel technical schemes of the invention, the diesel engine oil composition meets the CH-4 specification requirements, and comprises a viscosity grade of 0W-30, wherein the viscosity range is as follows: 9.3<Viscosity is less than or equal to 12.5mm²/s。

As a second parallel technical scheme of the invention, the engine oil composition meets the CF-4 specification requirement, and comprises a viscosity grade of 0W-40, wherein the viscosity range is as follows: 12.5<Viscosity is less than or equal to 16.3mm²/s。

In order to further promote the improvement of the low-temperature resistance of the diesel engine oil, the mass ratio of the viscosity index improver to the pour point depressant in the diesel engine oil composition is preferably (20-200): 1. More preferably (20-60): 1.

Preferably, the pour point depressant is a polymethacrylate pour point depressant.

More preferably, the pour point depressant is Vx 1-248; the HSD type viscosity index improver is VII-260.

In order to be better matched with the functional additive, the invention further improves the coordination effect of each component by optimizing the base oil. The base oil is preferably a mixture of a group V base oil and a group IV base oil or a mixture of a group IV base oil and a group III base oil.

Preferably, in the base oil, the mass ratio of the group IV base oil to the group V base oil or the group III base oil is (2-5): 1.

In the invention, the diesel engine oil complexing agent preferably meets the quality requirement of CH-4 or CF-4. More preferably, it is Lz4980A, or a mixture of Lz4980A and Lz 8680A.

As a preferable scheme, the invention provides a CH-40W-30 diesel engine oil composition which comprises the following components in parts by weight:

as another preferred scheme, the invention provides a CF-40W-40 diesel engine oil composition, which comprises the following components in parts by weight:

the invention also provides a preparation method of the diesel engine oil composition, which comprises the following steps: and mixing the base oil, the diesel engine oil complexing agent, the viscosity index improver and the pour point depressant in proportion.

The invention has the beneficial effects that:

the diesel engine oil composition provided by the invention can meet the specification requirements of CH-40W-30 and CF-40W-40, passes various low-temperature performance tests, has excellent low-temperature resistance, can ensure the normal operation of a diesel engine in a natural environment below-40 ℃, provides good low-temperature lubricity for the engine, and is particularly suitable for the diesel engine in alpine regions and in cold seasons.

Drawings

FIG. 1 is a pour point tester as a refrigeration environment in Experimental example 1 of the present invention.

FIG. 2 is a graph showing the flow of the CH-40W-30 engine oil of example 1 and the CF-40W-40 engine oil of example 3 in the pour point tester-40 ℃ environment for 48 hours in accordance with the present invention; the CH-40W-30 engine oil of example 1, the reference oil, and the CF-40W-40 of example 3 were sequentially provided from left to right.

FIG. 3 is a drawing of CH-40W-30 engine oil of example 1 and CF-40W-40 engine oil of example 3 in the pour point tester-40 ℃ environment for 48 hours according to the present invention; the CH-40W-30 engine oil of example 1, the reference oil, and the CF-40W-40 engine oil of example 3 were sequentially provided from left to right.

Detailed Description

Preferred embodiments of the present invention will be described in detail with reference to the following examples. It is to be understood that the following examples are given for illustrative purposes only and are not intended to limit the scope of the present invention. Various modifications and alterations of this invention will become apparent to those skilled in the art without departing from the spirit and scope of this invention.

The experimental procedures used in the following examples are all conventional procedures unless otherwise specified.

Materials, reagents and the like used in the following examples are commercially available, unless otherwise specified, wherein base oils are available from petrochemical group of China.

Example 1

The embodiment provides a low-temperature-resistant CH-40W-30 diesel engine oil composition which comprises the following components in percentage by weight:

example 2

The embodiment provides a low-temperature-resistant CH-40W-30 diesel engine oil composition which comprises the following components in percentage by weight:

example 3

The embodiment provides a low-temperature-resistant CF-40W-40 diesel engine oil composition which comprises the following components in percentage by weight:

example 4

The embodiment provides a low-temperature-resistant CF-40W-40 diesel engine oil composition which comprises the following components in percentage by weight:

experimental example 1 Performance test of Engine oil

The performance of each of the diesel engine oil compositions of examples 1 to 4 was analyzed, and the analysis items, the analysis methods, and the analysis results of the diesel engine oil compositions of examples 1 and 3 are shown in table 1. Fig. 1 shows a pour point tester as a refrigeration environment for detecting a pour point. The CH-40W-30 engine oil of example 1 and the CF-40W-40 engine oil of example 3 were allowed to flow after being left at a pour point tester-40 ℃ for 48 hours in an environment of FIG. 2, and the results showed that the CH-40W-30 engine oil of example 1 and the CF-40W-40 engine oil of example 3 had good fluidity under low temperature conditions and excellent low temperature resistance. The stringiness of the CH-40W-30 engine oil of example 1 and the CF-40W-40 engine oil of example 3 after being left for 48 hours in a pour point tester environment at-40 ℃ are shown in FIG. 3.

TABLE 1 analysis of properties of diesel engine oils

Further, engine mount tests were performed on the diesel engine oil compositions of examples 1 to 4, and the items and methods of analysis and the results of analysis of the diesel engine oil composition of example 1 are shown in table 2.

TABLE 2 Engine bench test results for Diesel Engine oils

Although the invention has been described in detail hereinabove with respect to a general description and specific embodiments thereof, it will be apparent to those skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.