A diffusion pump lubricating oil composition

By adding ionic liquid and antifoaming agent methyl silicone ester T903 to the diffusion pump lubricating oil, the resulting composition significantly improves corrosion resistance and antifoaming properties, solves the problem of insufficient performance of existing lubricating oils, extends the service life of diffusion pumps, and broadens the application range.

CN117625285BActive Publication Date: 2026-05-01PETROCHINA CO LTD
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Patent Information

Application Number
CN202210964508.8
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-08-11
Publication Date
2026-05-01
Estimated Expiration
2042-08-11

AI Technical Summary

Technical Problem

The existing diffusion pump lubricating oils have limited improvement in corrosion resistance, rust prevention, and anti-foaming properties, making it difficult to meet the wider application and longer service life requirements of diffusion pumps in fields such as vacuum smelting and vacuum coating.

Method used

A diffusion pump lubricating oil composition is formed by combining ionic liquid and antifoaming agent methyl silicone ester T903 with base oil methyl phenyl silicone oil. The ionic liquid content is 0.2-3%, the antifoaming agent content is 0.005-0.03%, and the balance is base oil.

Benefits of technology

The diffusion pump lubricating oil composition exhibits a copper strip corrosion rating of less than or equal to 1 at 100℃, meets liquid phase corrosion standards, and has a foaming tendency of less than or equal to 10/0 mL/mL, thus extending the service life of the diffusion pump and broadening its application range.

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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.
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