Lubricating oil for high temperature resistant powder metallurgy oil bearing and preparation method thereof

Abstract

A lubricating oil for high-temperature-resistant powder metallurgy oil-impregnated bearings, prepared from the following raw materials in parts by weight: 25-45 parts of trimethylolpropane ester, 55-75 parts of trimellitate, polymethacrylate 2-10 parts, 1-5 parts of diisooctyl diphenylamine, 1-5 parts of high molecular weight phenol, 0.1-1 part of benzotriazole, 0.1-1 part of triphenyl phosphorothioate and 0.005 parts of methyl silicone oil ‑0.02 parts. The lubricating oil of the present invention can carry out continuous and stable lubricating operation of oil-impregnated bearings at a temperature of 200°C or above. And the lubricating oil is not easy to change color after long-term use at high temperature, and there will be no oxidation and coking. The finished lubricating oil has a high flash point and low evaporation loss. After being used, it can significantly prolong the service life of the equipment and reduce its maintenance rate.

Description

technical field [0001] The invention relates to the technical field of lubricating oil, in particular to a lubricating oil for high-temperature-resistant powder metallurgy oil-impregnated bearings and a preparation method thereof. Background technique [0002] Powder metallurgy oil-impregnated bearings are made of metal powder and other anti-friction material powders by pressing, sintering, shaping and oil immersion. The bearing is filled with lubricating oil by means of high temperature or vacuum immersion in lubricating oil. During operation, due to the suction effect of the journal rotation and frictional heating, the metal and oil are heated and expanded, and the oil is squeezed out of the pores, and then in The friction surface acts as a lubricant, and after the bearing cools down, the oil is sucked back into the pores, thereby achieving a self-lubricating effect. [0003] Powder metallurgy oil-impregnated bearings are widely used in household appliances, automobiles, ...

AI Technical Summary

Problems solved by technology

At present, after the common PAO oil products commonly used in the prior art are used for a long time above 150°C, the lubricating oil is prone to large evaporation loss and oxidative discoloration, resulting in a decrease in the lubricity of the equipment and a large wear of the bearing, which requires regular maintenance. Lubricating oil replenishment and overall replacement for oil-impregnated bearings

However, 1. It is cumbersome to replenish lubricating oil regularly, and the maintenance cost of equipment is high; 2. It is difficult to directly fill lubricating oil for some special parts; 3. When filling a lot of lubricating oil, the bearing itself is easy to absorb dust. Or there will be dripping phenomenon, which will pollute the product and affect the service life of the equipment

At the same time, when this ordinary PAO oil lubricating oil is overloaded at a high temperature for a long time, it will cause coking, which will bring great damage to the repair, maintenance and service life of household appliances and other equipment.

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