Lubricating oil composition for variable-volume vacuum pump and preparation method of lubricating oil composition

Abstract

The invention discloses a lubricating oil composition for a variable-volume 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, 0.001 to 0.02 percent of demulsifying agent, 0.001 to 0.02 percent of anti-foaming agent and the balance of base oil. The lubricating oil composition for the variable-volume vacuum pump has excellent anti-rust property, corrosion resistance, oxidation resistance, demulsibility and anti-foaming property, and has a wide application prospect. The method for preparing the lubricating oil composition for the variable-volume vacuum pump is simple in process, easy to operate and wide in application range.

Description

Technical Field

[0001] The invention relates to a lubricating oil composition for a variable displacement vacuum pump and a preparation method thereof. Background Art

[0002] The variable displacement vacuum pump is one of the most basic vacuum obtaining equipment in vacuum technology. The performance of the variable displacement vacuum pump lubricating oil directly affects the use of the variable displacement vacuum pump. In order to broaden the scope of use of the variable displacement vacuum pump and extend the service life of the variable displacement vacuum pump, there are certain requirements for the anti-rust, anti-corrosion, anti-oxidation, anti-emulsification and anti-foaming properties of the variable displacement vacuum pump lubricating oil.

[0003] Although the current variable volume vacuum pump oil can improve the various properties of vacuum pump lubricating oil to a certain extent (for example, rust resistance, corrosion resistance, oxidation resistance, demulsification resistance and foam resistance, etc.), the degree of improvement on the various properties of variable volume vacuum pump lubricating oil is still limited, so that there is still room for further improvement in the various properties of variable volume vacuum pump lubricating oil, especially the rust resistance, corrosion resistance and oxidation resistance of variable volume vacuum pump lubricating oil. Summary of the invention

[0004] In order to at least partially solve the above technical problems existing in the prior art, an embodiment of the present invention provides a lubricating oil composition for a variable displacement vacuum pump having excellent rust resistance, corrosion resistance and oxidation resistance and a preparation method thereof.

[0005] As one aspect of the present invention, it relates to a lubricating oil composition for a variable displacement vacuum pump, wherein the lubricating oil composition comprises the following raw materials by mass percentage: 0.1-1.0% of a diionic liquid, 0.001-0.02% of a demulsifier, 0.001-0.02% of an antifoaming agent, and the balance is a base oil;

[0006] The diionic liquid is shown in formula (I):

[0007]

[0008] In formula (I), the value range of n is: 12≤n≤18, and n is an integer.

[0009] By adopting the above technical scheme, on the one hand, the diionic liquid as shown in formula (I) is used in the raw material of the lubricating oil composition of the present invention. The diionic liquid adopts a compound system of imidazolium cation and carboxylic acid anion, which can improve the protection ability of the lubricating oil to metals, reduce sludge formation, extend the service life of the oil product, and increase the rust resistance, corrosion resistance and oxidation resistance of the lubricating oil. The selection of C12-18 alkyl chain can also increase the solubility of the diionic liquid, further ensuring that the diionic liquid raw material is fully dissolved in the oil product under high and low temperature conditions, and can show excellent compatibility when matched with other components. On the other hand, the specific content of the above diionic liquid is matched with the specific content of demulsifier and antifoaming agent, which can make the lubricating oil composition for variable displacement vacuum pump have excellent comprehensive performance.

[0010] In one or some possible embodiments, the lubricating oil composition comprises the following constituent raw materials, by mass percentage: 0.3-0.6% diionic liquid, 0.005-0.01% demulsifier, 0.005-0.01% antifoaming agent, and the balance is base oil.

[0011] By adopting the above technical solution, the compatibility of the raw materials in the lubricating oil composition can be further improved, thereby improving the comprehensive performance of the lubricating oil composition for a variable displacement vacuum pump.

[0012] In one or some possible embodiments, the demulsifier is selected from one or more of oil-soluble polyether DL32, LZ5957 or polyethyleneimine alkoxylate 9393.

[0013] In one or some possible embodiments, the antifoaming agent is 1# composite antifoaming agent T921 and / or 2# composite antifoaming agent T922.

[0014] In one or some possible embodiments, the base oil is a mixture of PCL500N and HVIH150BSM in any ratio.

[0015] As another aspect of the present invention, it relates to a method for preparing the lubricating oil composition for the variable displacement vacuum pump, the method comprising the following steps: weighing and mixing the above-mentioned constituent raw materials in sequence according to the above-mentioned mass percentages.

[0016] The beneficial effects of the above technical solution provided by the embodiment of the present application include at least:

[0017] The lubricating oil composition for a variable displacement vacuum pump of the present invention has excellent rust resistance, corrosion resistance, oxidation resistance, demulsification resistance and foam resistance, and has broad application prospects.

[0018] The method for preparing the lubricating oil composition for a variable displacement vacuum pump of the present invention has simple process, easy operation and wide application range.

[0019] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained in the description and claims. DETAILED DESCRIPTION

[0020] The following are exemplary embodiments of the present disclosure. The following exemplary embodiments should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described 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.

[0021] 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.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] Example 1

[0026] The constituent raw materials and mass contents of the lubricating oil composition for a variable displacement vacuum pump of this embodiment are shown in Table 1 below.

[0027] Table 1 Composition and mass content of raw materials

[0028]

[0029] Example 2

[0030] The constituent raw materials and mass contents of the lubricating oil composition for a variable displacement vacuum pump of this embodiment are shown in Table 2 below.

[0031] Table 2 Composition and mass content of raw materials

[0032]

[0033] Example 3

[0034] The composition materials and mass contents of the lubricating oil composition for the variable displacement vacuum pump of this embodiment are shown in Table 3 below.

[0035] Table 3 Composition and mass content of raw materials

[0036]

[0037] Comparative Example 1

[0038] The constituent raw materials and mass contents of the lubricating oil composition for a variable displacement vacuum pump of this comparative example are shown in Table 4 below.

[0039] Table 4 Composition and mass content of raw materials

[0040]

[0041] Comparative Example 2

[0042] The constituent raw materials and mass contents of the lubricating oil composition for a variable displacement vacuum pump of this comparative example are shown in Table 5 below.

[0043] Table 5 Composition and mass content

[0044]

[0045] Comparative Example 3

[0046] The composition materials and mass contents of the lubricating oil composition for a variable displacement vacuum pump of this comparative example are shown in Table 6 below.

[0047] Table 6 Composition and mass content

[0048]

[0049]

[0050] Comparative Example 4

[0051] The constituent raw materials and mass contents of the lubricating oil composition for a variable displacement vacuum pump of this comparative example are shown in Table 7 below.

[0052] Table 7 Composition and mass content

[0053]

[0054] The following performance tests were performed on the above Examples 1 to 3 and Comparative Examples 1 to 4, and the performance test results are recorded in Table 8 below.

[0055] Table 8 Performance test results

[0056]

[0057]

[0058] Through the performance test results in Table 8, combined with Examples 1 to 3 and Comparative Examples 1 to 4, the following conclusions can be drawn:

[0059] (1) It can be seen from Table 8 that when the steel rod is placed in a mixture of the lubricating oil composition for a variable volume vacuum pump and distilled water at 60°C and subjected to rust treatment for 24 hours, the steel rod is rust-free; when the steel rod is placed in a mixture of the lubricating oil composition for a variable volume vacuum pump and synthetic seawater at 60°C and subjected to rust treatment for 24 hours, the steel rod has light rust or above. Therefore, the inventors believe that the lubricating oil composition for a variable volume vacuum pump of the present invention has excellent rust prevention performance.

[0060] (2) A copper sheet is placed in the lubricating oil composition for a variable displacement 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 TOST oxidation life of the lubricating oil composition for a variable displacement vacuum pump of the present invention is greater than 3000 hours; the time for the emulsion layer to reach 3mL is less than 20 minutes; and the foam tendency / foam stability is less than 30 / 30mL / mL. Therefore, the inventors believe that the lubricating oil composition for a variable displacement vacuum pump of the present invention has excellent corrosion resistance, oxidation resistance, emulsification resistance and foam resistance.

[0061] (3) By comparing Examples 1 to 3 and Comparative Examples 1 to 2, the inventors believe that: a specific content of diionic liquid matches a specific content of demulsifier and antifoaming agent, which can make the lubricating oil composition for a variable displacement vacuum pump have excellent comprehensive performance. And by comparing Examples 1 to 3, 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 a variable displacement vacuum pump is further improved.

[0062] By comparing Example 3 with Comparative Examples 3 to 4, it can be found that when no diionic liquid is added to the raw material, the rust resistance, corrosion resistance and other properties of the lubricating oil product are far inferior to the lubricating oil product with diionic liquid raw materials added; when diionic liquid is added to the raw material, but a shorter alkyl chain is selected, the rust resistance, corrosion resistance and other 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 variable displacement vacuum pump of the present invention has more excellent rust resistance, corrosion resistance and oxidation resistance.

[0063] In summary, the lubricating oil composition for a variable displacement vacuum pump prepared in the embodiment of the present invention has relatively excellent rust resistance, corrosion resistance, oxidation resistance, demulsification resistance and foam resistance, especially has relatively excellent rust resistance, corrosion resistance and oxidation resistance.

[0064] 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.

[0065] 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.

[0066] 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 variable displacement vacuum pump, characterized in that: The lubricating oil composition comprises the following raw materials by mass percentage: 0.1-1.0% of diionic liquid, 0.001-0.02% of demulsifier, 0.001-0.02% of antifoaming agent, and the balance of 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 positive displacement vacuum pump according to claim 1, characterized in that: The lubricating oil composition comprises the following raw materials by mass percentage: 0.3-0.6% of diionic liquid, 0.005-0.01% of demulsifier, 0.005-0.01% of antifoaming agent, and the balance is base oil.

3. The lubricating oil composition for a positive displacement vacuum pump according to claim 1 or 2, characterized in that: The demulsifier is selected from one or more of oil-soluble polyether DL32, LZ5957 or polyethyleneimine alkoxylate 9393.

4. The lubricating oil composition for a positive displacement 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.

5. The lubricating oil composition for a positive displacement vacuum pump according to claim 1 or 2, characterized in that: The base oil is a mixture of PCL500N and HVIH150BSM in any ratio.

6. A method for preparing a lubricating oil composition for a positive displacement vacuum pump according to any one of claims 1 to 5, characterized in that: The method comprises the following steps: weighing and mixing the above-mentioned constituent raw materials in sequence according to the mass percentage.

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