Lubricating oil composition for low-ultimate-pressure vacuum pump and preparation method of lubricating oil composition

Abstract

The invention discloses a lubricating oil composition for a low-ultimate-pressure vacuum pump and a preparation method of the lubricating oil composition. The lubricating oil composition is prepared from the following raw materials in percentage by mass: 0.1 to 1.0 percent of double-ion liquid, 0.2 to 2.0 percent of an antioxidant, 0.005 to 0.05 percent of a demulsifying agent, 0.005 to 0.05 percent of an anti-foaming agent and the balance of base oil. The lubricating oil composition for the low-ultimate-pressure vacuum pump not only has relatively excellent comprehensive properties (anti-rust property, corrosion resistance, wear resistance, oxidation resistance, demulsibility and anti-foaming property), but also is simple in preparation process, easy to operate and wide in application range. According to the designed low-limit-pressure vacuum pump, after the prepared lubricating oil composition is used, the positions of a bearing, a gear and the like of the low-limit-pressure vacuum pump have excellent anti-rust performance, corrosion resistance and the like, and therefore the low-limit-pressure vacuum pump has the long service life and the wide application range.

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, chemical and other methods to improve, generate and maintain vacuum in a closed space. It is the most basic vacuum obtaining equipment in vacuum technology. It is widely used in industrial fields such as metallurgy, forging, energy and chemical industry, food packaging, as well as high-tech fields such as semiconductors, vacuum coating, scientific instruments, aerospace, and new energy fields such as solar photovoltaics and lithium-ion batteries. Ultimate pressure is an important indicator of the performance of a vacuum pump. Low ultimate pressure vacuum pumps are favored by the market because of their better ultimate vacuum, higher pumping rate and shorter pumping time. Low ultimate pressure vacuum pumps have certain requirements for the rust resistance, corrosion resistance, wear resistance, oxidation resistance, emulsification resistance and foam resistance of lubricating oil, especially for rust resistance and corrosion resistance. Good rust resistance and corrosion resistance can reduce the influence of impurities such as water vapor on the lubricating oil during vacuuming, reduce its corrosion effect on the vacuum pump, and extend its service life.

[0003] Although the existing technology can improve the various properties of the low-limit pressure vacuum pump lubricating oil composition to a certain extent (for example, rust resistance, corrosion resistance, wear resistance, oxidation resistance, demulsification resistance and foam resistance, etc.), the degree of improvement of the various properties of the low-limit pressure vacuum pump lubricating oil composition is still limited, especially the rust resistance and corrosion resistance of the low-limit pressure vacuum pump lubricating oil composition 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 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 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# composite antifoaming agent T921 and / or 2# composite 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 of 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, the method comprising 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 solution provided by the embodiment 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 making the low-limit pressure vacuum pump have a longer service life and a wider range of applications. DETAILED DESCRIPTION

[0032] The exemplary embodiments of the present disclosure will be described in more detail below. The following are exemplary embodiments of the present disclosure, but 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. On the contrary, 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 in the present invention are only for describing special embodiments and are not intended to limit the present invention. In addition, for the numerical range in the present invention, it should be understood that each intermediate value between the upper and lower limits of the scope is also specifically disclosed. Each smaller range between the intermediate value in any stated value or stated range and any other stated value or intermediate value in the described range is also included in the present invention. The upper and lower limits of these smaller ranges can be independently included or excluded in the scope.

[0034] Unless otherwise indicated, all technical and scientific terms used herein have the same meanings 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 a 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" and the like are open terms, meaning including but not limited to.

[0036] The lubricating oil composition prepared by the present invention comprises a diionic liquid, an antioxidant, a demulsifier, an antifoaming agent and a base oil in a specific mass content. On the one hand, the diionic liquid as one of the main components of the lubricating oil is as shown in the following formula:

[0037]

[0038] The diionic liquid is a compound system of imidazolium cation and phosphate anion, which can improve the protection ability of lubricating oil to metal, increase the rust resistance and corrosion resistance of lubricating oil; in addition, the C12-16 alkyl chain can increase the solubility of diionic liquid, ensure that it can be dissolved in oil products under high and low temperature conditions, and can also show excellent compatibility when matched with other components. On the other hand, the specific content of the diionic liquid is matched with the specific content of antioxidant, demulsifier and antifoaming agent, which can make the low-limit pressure vacuum pump lubricating oil composition have excellent comprehensive performance.

[0039] The present invention is further described below in conjunction with specific examples, and the protection scope 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 raw 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 and mass content of raw materials

[0043]

[0044] Example 2

[0045] The constituent raw 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 and mass content of raw materials

[0047]

[0048] Example 3

[0049] The constituent raw 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 and mass content of raw materials

[0051]

[0052] Example 4

[0053] The constituent raw 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 and mass content of raw materials

[0055]

[0056] Example 5

[0057] The constituent raw 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 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

[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

[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

[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] Through 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) It can be seen from Table 10 that when the steel bar is placed in a mixture of the lubricating oil composition for a low-limit pressure vacuum pump and distilled water at 60°C and subjected to rust treatment for 24 hours, the steel bar is rust-free; when the steel bar is placed in a mixture of the lubricating oil composition for a low-limit pressure vacuum pump and synthetic seawater at 60°C and subjected to rust treatment for 24 hours, the steel bar is slightly rusted or above. Therefore, the inventors believe that the lubricating oil composition for a low-limit pressure vacuum pump of the present invention has excellent rust prevention performance.

[0083] (2) A copper sheet is 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 level of the copper sheet is 1b or above, and the wear spot diameter of the lubricating oil composition for a low-limit pressure vacuum pump of the present invention is less than 0.6 mm, the rotating oxygen bomb is greater than 1500 min, the time for the emulsion layer to reach 3 mL is less than 10 min, and the foam tendency / foam stability is less than 20 / 20 mL / mL. Therefore, the inventor believes 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 foam resistance.

[0084] (3) By comparing Examples 1 to 5 and Comparative Examples 3 to 4, the inventors believe that: the specific content of the diionic liquid matches the specific content of the demulsifier and the antifoaming agent, which can make the lubricating oil composition for the low-limit pressure vacuum pump have excellent comprehensive performance. And by comparing Examples 1 to 5, it can also be found that: the preferred amount of each raw material can further improve the compatibility between the raw materials, and then the comprehensive performance of the lubricating oil composition for the low-limit pressure vacuum pump is further improved.

[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 material, the anti-rust and anti-corrosion properties of the lubricating oil product are far inferior to those of the lubricating oil product with diionic liquid added to the raw material; when diionic liquid is added to the raw material, but a shorter alkyl chain is selected, the anti-rust and anti-corrosion properties of the lubricating oil product cannot meet the use requirements. Therefore, the inventor predicts that when a C12-18 alkyl chain is selected, the lubricating oil composition for a low ultimate pressure vacuum pump of the present invention has more excellent 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 foam resistance, especially has relatively excellent rust resistance and corrosion resistance.

[0087] Although the description of the present invention has been quite detailed and has been described in particular with respect to several described embodiments, it is not intended to be limited to any of these details or embodiments or any particular embodiment, so as to effectively cover the intended scope of the present invention. In addition, the present invention is described above with the embodiments foreseeable by the inventors, and its purpose is to provide a useful description, and those non-substantial changes to the present invention that are not currently foreseen may still represent equivalent changes of the present invention.

[0088] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0089] Although the 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 present invention, and that the scope of the present 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 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 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 of 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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