A diffusion pump lubricating oil composition

Abstract

The application discloses a diffusion pump lubricating oil composition, which comprises the following components in percentage by mass: ionic liquid 0.2-3%; anti-foaming agent 0.005-0.03%; and the balance is base oil. The diffusion pump lubricating oil composition has the following advantages: on the one hand, the main component of the diffusion pump lubricating oil is ionic liquid, which has good solubility in methylphenyl silicone oil; on the other hand, the diffusion pump lubricating oil has excellent corrosion resistance (the corrosion grade of copper sheet at 100 DEG C for 3 hours is less than or equal to 1), rust resistance (liquid phase rusting is qualified) and anti-foaming property (foam tendency / foam stability is less than or equal to 10 / 0 mL / mL), especially excellent corrosion resistance. The diffusion pump lubricating oil is used in bearings and shaft seals in the cavity of a diffusion pump, can play an excellent lubricating role, prolong the service life of the diffusion pump and broaden the use range of the diffusion pump.

Description

A diffusion pump lubricating oil composition Technical Field

[0001] This invention belongs to the field of lubricating oil technology, and specifically relates to a diffusion pump lubricating oil composition. Background Technology

[0002] A diffusion pump is a vacuum pump that uses a low-pressure, high-speed, and directional flow of oil vapor jets to draw air. It is a key piece of equipment for achieving high vacuum and is widely used in vacuum metallurgy, vacuum coating, space simulation experiments, and other fields. The performance of the diffusion pump lubricating oil directly affects the pump's performance. To broaden the application range of diffusion pumps and extend their service life, certain requirements are placed on the diffusion pump lubricating oil's properties, such as corrosion resistance, rust prevention, and anti-foaming properties.

[0003] While current vacuum pump oils can improve the properties of diffusion pump lubricants to some extent (e.g., corrosion resistance, rust prevention, and anti-foaming properties), the degree of improvement is still limited, leaving room for further improvement in various properties, especially corrosion resistance. Therefore, there is an urgent need for a diffusion pump lubricant composition that combines superior corrosion resistance, rust prevention, and anti-foaming properties. Summary of the Invention

[0004] The purpose of this invention is to provide a diffusion pump lubricating oil composition that has excellent corrosion resistance, rust prevention and anti-foaming properties.

[0005] The technical solution adopted in this invention is a diffusion pump lubricating oil composition, which comprises the following components by mass percentage: 0.2-3% ionic liquid; 0.005-0.03% antifoaming agent; and the balance being base oil.

[0006] The invention is further characterized in that,

[0007] The composition comprises the following components by mass percentage: 0.5-2% ionic liquid; 0.01-0.02% antifoaming agent; the balance being base oil.

[0008] The antifoaming agent is methyl silicone oil T903.

[0009] The base oil is methylphenyl silicone oil.

[0010] The structural formula of ionic liquids is as follows:

[0011]

[0012] The beneficial effects of this invention are:

[0013] The diffusion pump lubricating oil composition of this invention has two main characteristics. First, the main component of the lubricating oil is an ionic liquid, which exhibits good solubility in methylphenyl silicone oil. Second, the lubricating oil possesses excellent corrosion resistance (corrosion grade of copper strip ≤ 1 at 100°C for 3 hours), rust prevention (qualified for liquid phase corrosion), and anti-foaming properties (foaming tendency / foaming stability ≤ 10 / 0 mL / mL), especially its superior corrosion resistance. When used in bearings and shaft seals within the diffusion pump cavity, this lubricating oil provides excellent lubrication, extends the service life of the diffusion pump, and broadens its application range. Detailed Implementation

[0014] The present invention will now be described in detail with reference to specific embodiments.

[0015] This invention discloses a diffusion pump lubricating oil composition comprising, by weight percentage: 0.2-3% ionic liquid; 0.005-0.03% antifoaming agent; the balance being base oil;

[0016] Furthermore, the composition comprises, by weight percentage, the following components: 0.5-2% ionic liquid; 0.01-0.02% antifoaming agent; the balance being base oil;

[0017] The antifoaming agent is methyl silicone ester T903; the base oil is methyl phenyl silicone oil.

[0018] The structural formula of the ionic liquid is as follows:

[0019]

[0020] The diffusion pump lubricating oil composition of the present invention can be obtained by uniformly mixing the raw materials according to the above composition. The present invention does not impose any particular limitations on the order of addition of the raw materials, the stirring rate, or the mixing temperature.

[0021] The diffusion pump lubricating oil composition of the present invention not only has excellent comprehensive properties (corrosion resistance, rust prevention and anti-foaming properties), but also has a simple preparation process, is easy to operate, and has a wide range of applications.

[0022] Example 1

[0023] The composition of the diffusion pump lubricating oil composition in this embodiment is shown in Table 1. The structure of the ionic liquid is as follows:

[0024]

[0025] Table 1 Composition of diffusion pump lubricating oil composition

[0026] Name, Mass Percentage, Content / %: Ionic Liquid 3T903 0.005, Methylphenyl Silicone Oil 96.995 surface

[0027] Example 2

[0028] The composition of the diffusion pump lubricating oil composition in this embodiment is shown in Table 2. The structure of the ionic liquid is as follows:

[0029]

[0030] Table 2 Composition of diffusion pump lubricating oil composition

[0031] Name, Mass Percentage, Content / %: Ionic Liquid 2T903 0.01, Methylphenyl Silicone Oil 97.99 surface

[0032] Example 3

[0033] The composition of the diffusion pump lubricating oil composition in this embodiment is shown in Table 3. The structure of the ionic liquid is as follows:

[0034]

[0035] Table 3 Composition of diffusion pump lubricating oil composition

[0036] Name | Mass Percentage | Ionic Liquid | 0.2T903 | 0.03 | Methylphenyl Silicone Oil | 99.77 surface

[0037] Comparative Example 1

[0038] The composition of the diffusion pump lubricating oil composition in this comparative example is shown in Table 4.

[0039] Table 4 Composition of diffusion pump lubricating oil composition

[0040] Name, Percentage (%), T903 0.005, Methylphenyl Silicone Oil 99.995 surface

[0041] Comparative Example 2

[0042] The composition of the diffusion pump lubricating oil composition in this comparative example is shown in Table 5. The structure of the ionic liquid is as follows:

[0043]

[0044] Table 5 Composition of diffusion pump lubricating oil composition

[0045] Name, Mass Percentage, Content / %: Ionic Liquid 2T903 0.01, Methylphenyl Silicone Oil 97.99 surface

[0046] Comparative Example 3

[0047] The composition of the diffusion pump lubricating oil composition in this comparative example is shown in Table 6. The structure of the ionic liquid is as follows:

[0048]

[0049] Table 6 Composition of diffusion pump lubricating oil composition

[0050] Name | Mass Percentage | Ionic Liquid | 3.3T903 | 0.04 | Methylphenyl Silicone Oil | 96.66 surface

[0051] Performance Characterization

[0052] 1. Performance tests were conducted on the base oil methyl phenyl silicone oil, and the test results are shown in Table 7.

[0053] Table 7 Performance Test Results of Methylphenyl Silicone Oil

[0054] Project: Test method for methyl phenyl silicone oil; kinematic viscosity (25℃) / (mm) 2 / s)100.3 GB / T 265 Viscosity Index 358 GB / T 2541 surface

[0055] 2. The performance of the diffusion pump lubricating oil compositions in the examples and comparative examples was tested, and the test results are shown in Table 8.

[0056] Table 8 Performance test results of diffusion pump lubricating oil composition

[0057]

[0058] As can be seen from Table 8, the diffusion pump lubricating oil composition prepared in the embodiments of the present invention has excellent corrosion resistance, rust prevention and anti-foaming properties, especially excellent corrosion resistance.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A diffusion pump lubricating oil composition, characterized in that, The composition comprises, by weight percentage, the following components: 0.2-3% ionic liquid; 0.005-0.03% antifoaming agent; the balance being base oil; the base oil being methylphenyl silicone oil; the structural formula of the ionic liquid is as follows: 。 2. The diffusion pump lubricating oil composition according to claim 1, characterized in that, The composition comprises the following components by mass percentage: 0.5-2% ionic liquid; 0.01-0.02% antifoaming agent; and the balance being base oil.

3. A diffusion pump lubricating oil composition according to claim 1 or 2, characterized in that, The antifoaming agent is methyl silicone oil T903.

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