Lubricating oil composition for low ultimate pressure vacuum pump and preparation method thereof

Abstract

The present invention discloses a lubricating oil composition for a low-limit pressure vacuum pump and a preparation method thereof. The lubricating oil composition comprises the following raw materials, calculated by mass percentage: 0.1-1.0% of a diionic liquid, 0.2-2.0% of an antioxidant, 0.005-0.05% of a demulsifier, 0.005-0.05% of an anti-foaming agent, and the remainder being base oil. The lubricating oil composition for a low-limit pressure vacuum pump of the present invention not only has relatively excellent comprehensive properties (rust resistance, corrosion resistance, wear resistance, oxidation resistance, demulsification resistance, and anti-foaming properties), but also has a simple preparation process, is easy to operate, and has a wide range of applications. After using the lubricating oil composition prepared by the present invention, the low-limit pressure vacuum pump designed by the present invention has excellent rust resistance and corrosion resistance in its bearings, gears, and other parts, thereby enabling the low-limit pressure vacuum pump to have a longer service life and a wider range of applications.

Description

Technical Field

[0001] The invention relates to a lubricating oil composition for a low-limit pressure vacuum pump and a preparation method thereof. Background Art

[0002] A vacuum pump is a device that uses mechanical, physical, or chemical methods to improve, create, and maintain a vacuum in an enclosed space. It is the most fundamental vacuum-generating device in vacuum technology and is widely used in industries such as metallurgy, forging, energy and chemical engineering, and food packaging, as well as in high-tech fields such as semiconductors, vacuum coating, scientific instruments, and aerospace, and in new energy sectors such as solar photovoltaics and lithium-ion batteries. Ultimate pressure is a key indicator of vacuum pump performance. Low-ultimate-pressure vacuum pumps are favored in the market for their improved ultimate vacuum, higher pumping rates, and shorter pumping times. Low-ultimate-pressure vacuum pumps place specific demands on the lubricant's rust resistance, corrosion resistance, wear resistance, oxidation resistance, demulsification resistance, and anti-foaming properties. Rust resistance and corrosion resistance are particularly important. Good rust resistance and corrosion resistance can reduce the impact of impurities such as water vapor during the vacuuming process, reducing corrosion and extending the vacuum pump's service life.

[0003] Although the existing technology can improve the various properties of low-limit pressure vacuum pump lubricating oil compositions to a certain extent (for example, rust resistance, corrosion resistance, wear resistance, oxidation resistance, demulsification resistance and foaming resistance), the degree of improvement in the various properties of low-limit pressure vacuum pump lubricating oil compositions is still limited. In particular, the rust resistance and corrosion resistance of low-limit pressure vacuum pump lubricating oil compositions are still difficult to meet the current needs.

[0004] Therefore, there is an urgent need to provide a low ultimate pressure vacuum pump lubricating oil composition having more excellent rust resistance, corrosion resistance, wear resistance, oxidation resistance, demulsification resistance and anti-foaming properties. Summary of the Invention

[0005] In order to at least partially solve the above-mentioned technical problems existing in the prior art, an embodiment of the present invention provides a low-limit pressure vacuum pump lubricating oil composition having excellent rust resistance, corrosion resistance, wear resistance, oxidation resistance, demulsification resistance and anti-foaming properties and a preparation method thereof.

[0006] As one aspect of the present invention, it relates to a lubricating oil composition for a low ultimate pressure vacuum pump, wherein the lubricating oil composition comprises the following constituent raw materials, calculated by mass percentage:

[0007] Diionic liquid 0.1~1.0%,

[0008] Antioxidant 0.2~2.0%,

[0009] Demulsifier 0.005~0.05%,

[0010] Antifoaming agent 0.005~0.05%,

[0011] The balance is base oil;

[0012] The diionic liquid is shown in formula (I):

[0013]

[0014] In formula (I), the value range of n is: 12≤n≤18, and n is an integer.

[0015] In one or some possible embodiments, the lubricating oil composition comprises the following constituent raw materials, calculated by mass percentage:

[0016] Diionic liquid 0.3-0.6%,

[0017] Antioxidant 0.6-1%,

[0018] Demulsifier 0.01-0.02%,

[0019] Antifoaming agent 0.01-0.02%,

[0020] The balance is base oil.

[0021] In one or some possible embodiments, the mass ratio of the diionic liquid to the antioxidant is 1:(1-2).

[0022] In one or some possible embodiments, the antioxidant is an amine antioxidant L57 and / or a phenolic antioxidant L135.

[0023] In one or some possible embodiments, the demulsifier is selected from one or more of the oil-soluble polyether compounds DL32, LZ5957 or polyethyleneimine alkoxylate 9393.

[0024] In one or some possible embodiments, the antifoaming agent is 1# compound antifoaming agent T921 and / or 2# compound antifoaming agent T922.

[0025] In one or some possible embodiments, the base oil is a base oil having a saturated vapor pressure of no more than 5×10 -8 PAO10 in kPa.

[0026] As another aspect of the present invention, it relates to a method for preparing the above-mentioned lubricating oil composition for an extreme pressure vacuum pump, which method comprises the following steps: weighing and mixing the constituent raw materials in sequence according to the mass percentages.

[0027] As another aspect of the present invention, it relates to an ultimate pressure vacuum pump, wherein the low ultimate pressure vacuum pump uses the above-mentioned lubricating oil composition;

[0028] The ultimate partial pressure of the low ultimate pressure vacuum pump is less than 1×10 -6 kPa, the ultimate total pressure is less than 1×10 -5 kPa.

[0029] The beneficial effects of the above technical solutions provided by the embodiments of the present application include at least:

[0030] The lubricating oil composition for a low ultimate pressure vacuum pump of the present invention not only has relatively excellent comprehensive properties (rust resistance, corrosion resistance, wear resistance, oxidation resistance, demulsification resistance and foam resistance), but also has a simple preparation process, is easy to operate and has a wide range of applications.

[0031] The low-limit pressure vacuum pump of the present invention, after using the lubricating oil composition prepared by the present invention, has excellent rust resistance and corrosion resistance at its bearings, gears and other positions, thereby enabling the low-limit pressure vacuum pump to have a longer service life and a wider range of applications. DETAILED DESCRIPTION

[0032] The following are exemplary embodiments of the present disclosure. The following are exemplary embodiments of the present disclosure. However, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. Instead, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0033] It should be understood that the terms described herein are intended only to describe particular embodiments and are not intended to limit the present invention. In addition, for numerical ranges herein, it should be understood that each intermediate value between the upper and lower limits of the range is also specifically disclosed. Each smaller range between any intermediate value within a stated value or stated range and any other stated value or intermediate value within the stated range is also encompassed by the present invention. The upper and lower limits of these smaller ranges may be independently included or excluded within the scope.

[0034] Unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the invention belongs. Although the present invention describes only preferred methods and materials, any methods and materials similar or equivalent to those described herein may also be used in the implementation or testing of the present invention. All documents mentioned in this specification are incorporated by reference to disclose and describe the methods and / or materials related to the documents. In the event of any conflict with any incorporated document, the content of this specification shall prevail.

[0035] In the description of the present invention, it should be noted that the terms “include”, “including”, “have”, “contain”, etc. are all open terms, which mean including but not limited to.

[0036] The lubricating oil composition prepared by the present invention includes a diionic liquid, an antioxidant, a demulsifier, an antifoaming agent, and a base oil in specific weight amounts. In one aspect, the diionic liquid, which is one of the main components of the lubricating oil, is represented by the following formula:

[0037]

[0038] The diionic liquid is a composite system of imidazolium cations and phosphate anions, which enhances the lubricant's ability to protect metals and improve its rust and corrosion resistance. Furthermore, the C12-16 alkyl chain increases the diionic liquid's solvency, ensuring its solubility in oils at both high and low temperatures, and exhibits excellent compatibility with other components. Furthermore, a specific content of the diionic liquid, combined with specific amounts of antioxidants, demulsifiers, and antifoaming agents, ensures that the low-ultimate-pressure vacuum pump lubricant composition exhibits excellent overall performance.

[0039] The present invention will be further described below with reference to specific examples, but the scope of protection of the present invention is not limited by the following examples. The sources of materials mainly involved in the examples or preparation examples are all conventional commercial products.

[0040] Example 1

[0041] The constituent materials and mass contents of the lubricating oil composition for a low ultimate pressure vacuum pump of this embodiment are shown in Table 1 below.

[0042] Table 1 Composition of raw materials and mass content

[0043]

[0044] Example 2

[0045] The constituent materials and mass contents of the lubricating oil composition for a low ultimate pressure vacuum pump of this embodiment are shown in Table 2 below.

[0046] Table 2 Composition of raw materials and mass content

[0047]

[0048] Example 3

[0049] The constituent materials and mass contents of the lubricating oil composition for a low ultimate pressure vacuum pump of this embodiment are shown in Table 3 below.

[0050] Table 3 Composition of raw materials and mass content

[0051]

[0052] Example 4

[0053] The constituent materials and mass contents of the lubricating oil composition for a low ultimate pressure vacuum pump of this embodiment are shown in Table 4 below.

[0054] Table 4 Composition of raw materials and mass content

[0055]

[0056] Example 5

[0057] The constituent materials and mass contents of the lubricating oil composition for a low ultimate pressure vacuum pump of this embodiment are shown in Table 5 below.

[0058] Table 5 Composition of raw materials and mass content

[0059]

[0060]

[0061] Comparative Example 1

[0062] The constituent raw materials and mass contents of the lubricating oil composition for a low ultimate pressure vacuum pump of this comparative example are shown in Table 6 below.

[0063] Table 6 Composition and mass content of raw materials

[0064]

[0065] Comparative Example 2

[0066] The constituent raw materials and mass contents of the lubricating oil composition for a low ultimate pressure vacuum pump of this comparative example are shown in Table 7 below.

[0067] Table 7 Composition and mass content of raw materials

[0068]

[0069] Comparative Example 3

[0070] The constituent raw materials and mass contents of the lubricating oil composition for a low ultimate pressure vacuum pump of this comparative example are shown in Table 8 below.

[0071] Table 8 Composition and mass content

[0072]

[0073] Comparative Example 4

[0074] The constituent raw materials and mass contents of the lubricating oil composition for a low ultimate pressure vacuum pump of this comparative example are shown in Table 9 below.

[0075] Table 9 Composition and mass content of raw materials

[0076]

[0077] The following performance tests were performed on the above Examples 1 to 5 and Comparative Examples 1 to 4, and the test results are recorded in Table 10 below.

[0078] Table 10 Performance test results

[0079]

[0080]

[0081] Based on the performance test results in Table 10, combined with Examples 1 to 5 and Comparative Examples 1 to 4, the following conclusions can be drawn:

[0082] (1) As can be seen from Table 10, when a steel bar was placed in a mixture of the lubricating oil composition for a low-ultimate-pressure vacuum pump and distilled water at 60°C for 24 hours and subjected to a rust treatment, the steel bar was rust-free; when a steel bar was placed in a mixture of the lubricating oil composition for a low-ultimate-pressure vacuum pump and synthetic seawater at 60°C for 24 hours and subjected to a rust treatment, the steel bar had light rust or worse. Therefore, the inventors believe that the lubricating oil composition for a low-ultimate-pressure vacuum pump of the present invention has excellent rust prevention properties.

[0083] (2) A copper sheet was placed in the lubricating oil composition for a low-limit pressure vacuum pump at 100°C and subjected to corrosion treatment for 3 hours. The corrosion grade of the copper sheet was 1b or above. The wear spot diameter of the lubricating oil composition for a low-limit pressure vacuum pump of the present invention was less than 0.6 mm, the rotating oxygen bomb was greater than 1500 min, the time it took for the emulsion layer to reach 3 mL was less than 10 min, and the foam tendency / foam stability was less than 20 / 20 mL / mL. Therefore, the inventors believe that the lubricating oil composition for a low-limit pressure vacuum pump of the present invention has excellent corrosion resistance, wear resistance, oxidation resistance, demulsification resistance, and anti-foaming properties.

[0084] (3) By comparing Examples 1-5 with Comparative Examples 3-4, the inventors believe that the combination of a specific content of diionic liquid with a specific content of demulsifier and antifoaming agent can impart excellent overall performance to the lubricating oil composition for a low-limit pressure vacuum pump. Furthermore, by comparing Examples 1-5, it was found that optimizing the amounts of each raw material can further enhance the compatibility between the raw materials, thereby further improving the overall performance of the lubricating oil composition for a low-limit pressure vacuum pump.

[0085] (4) By comparing Examples 1-2 and Comparative Examples 1-2, it can be found that when no diionic liquid is added to the raw materials, the anti-rust and anti-corrosion properties of the lubricating oil product are far inferior to those of the lubricating oil product added with the diionic liquid raw materials. When the diionic liquid is added to the raw materials, but a shorter alkyl chain is selected, the anti-rust and anti-corrosion properties of the lubricating oil product do not meet the use requirements. Therefore, the inventors predict that when a C12-18 alkyl chain is selected, the lubricating oil composition for low ultimate pressure vacuum pumps of the present invention will have even better anti-rust and anti-corrosion properties.

[0086] In summary, the lubricating oil composition for a low ultimate pressure vacuum pump prepared in the embodiment of the present invention has relatively excellent rust resistance, corrosion resistance, wear resistance, oxidation resistance, demulsification resistance and anti-foaming properties, especially relatively excellent rust resistance and corrosion resistance.

[0087] Although the present invention has been described in considerable detail and with particularity with respect to several embodiments, it is not intended to limit the present invention to any of these details or embodiments or any particular embodiment, so as to effectively encompass the intended scope of the present invention. In addition, the present invention has been described above with respect to embodiments foreseen by the inventors for the purpose of providing a useful description, and those insubstantial modifications of the present invention that are not currently foreseen may still represent equivalent modifications of the present invention.

[0088] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative uses of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0089] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A lubricating oil composition for a low ultimate pressure vacuum pump, characterized in that: The lubricating oil composition comprises the following constituent raw materials, calculated by mass percentage: Diionic liquid 0.1~1.0%, Antioxidant 0.2~2.0%, Demulsifier 0.005~0.05%, Antifoaming agent 0.005~0.05%, The balance is base oil; The diionic liquid is shown in formula (I): In formula (I), the value range of n is: 12≤n≤18, and n is an integer.

2. The lubricating oil composition for a low ultimate pressure vacuum pump according to claim 1, characterized in that The lubricating oil composition comprises the following constituent raw materials, calculated by mass percentage: Diionic liquid 0.3-0.6%, Antioxidant 0.6-1%, Demulsifier 0.01-0.02%, Antifoaming agent 0.01-0.02%, The balance is base oil.

3. The lubricating oil composition for a low ultimate pressure vacuum pump according to claim 1 or 2, characterized in that The mass ratio of the diionic liquid to the antioxidant is 1:(1-2).

4. The lubricating oil composition for a low ultimate pressure vacuum pump according to claim 1 or 2, characterized in that The antioxidant is an amine antioxidant L57 and / or a phenolic antioxidant L135.

5. The lubricating oil composition for a low ultimate pressure vacuum pump according to claim 1 or 2, characterized in that The demulsifier is selected from one or more of the oil-soluble polyether compounds DL32, LZ5957 or polyethyleneimine alkoxylate 9393.

6. The lubricating oil composition for a low ultimate pressure vacuum pump according to claim 1 or 2, characterized in that The antifoaming agent is 1# composite antifoaming agent T921 and / or 2# composite antifoaming agent T922.

7. The lubricating oil composition for a low ultimate pressure vacuum pump according to claim 1 or 2, characterized in that The base oil has a saturated vapor pressure of no more than 5×10 -8 PAO10 in kPa.

8. A method for preparing the lubricating oil composition for a low ultimate pressure vacuum pump according to any one of claims 1 to 7, characterized in that: The method comprises the following steps: weighing and mixing the constituent raw materials in sequence according to the mass percentage.

9. A low ultimate pressure vacuum pump, characterized in that: The low ultimate pressure vacuum pump uses the lubricating oil composition according to any one of claims 1 to 7; The ultimate partial pressure of the low ultimate pressure vacuum pump is less than 1×10 -6 kPa, the ultimate total pressure is less than 1×10 -5 kPa.

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