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Application of Silicone Oil in Lubrication Industry

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Silicone oil, also known as polysiloxane, has a very stable silicon-oxygen bond, so silicone oil has good thermal and oxidative stability. The silicone oils currently used as lubricating oils mainly include methyl silicone oil, methyl phenyl silicone oil, methyl chlorophenyl silicone oil and ethyl silicone oil. Methyl silicone oil is generally used as damping fluid and special-purpose grease base oil; ethyl silicone oil is mainly used for precision instrument oil; methyl phenyl silicone oil is often used in the production of synthetic high temperature lubrication due to its high temperature resistance, low freezing point and good oxidation resistance Grease base oil; Chlorosilicone oil has better lubricity than other silicone oils, so it is often used as a base oil for the preparation of medium-duty greases.

The lubricating oil in the lubricating oil system is usually operated in a forced circulation mode, and some air is often entered during operation, and foam and air bubbles will be generated in the case of intense agitation. The larger air bubbles can quickly rise to the surface of the oil, while the smaller ones The bubbles rise slowly, and no matter what form they exist in the oil, they will have adverse effects on the equipment. It may cause the oil pump to not increase the oil pressure and affect the oil circulation, destroy the oil film, and cause wear. At the same time, the oil pressure is unstable and affects the adjustment. In severe cases, the foam overflows from the top of the fuel tank, threatening the operation of the unit, so the oil must have anti-foaming properties.

In order to eliminate the foam generated by the working medium when the equipment system is working, after long-term observation and research, a variety of defoaming methods have been found, such as physical defoaming, mechanical defoaming, chemical defoaming, etc. Among them, chemical defoaming The effect of adding anti-foaming agent in the foaming method is the best and the method is simple. Therefore, it is widely used at home and abroad. In 1943, Shell Development Corporation and Gulf Research and Development Corporation simultaneously discovered that liquid organopolysiloxanes are very effective antifoaming agents. Methyl silicone oil is still widely used as an antifoaming agent for lubricating oils.

Precision instrument oil is a low-temperature-resistant instrument lubricating oil prepared from low-viscosity synthetic lubricating oil with excellent viscosity-temperature properties and adding various additives such as anti-oxidation and anti-corrosion. This precision instrument oil is designed for low-temperature and low-torque precision instruments, timers, high-precision miniature bearings, gear shafts and slideway shafts for life-long lubrication. It has excellent oxidation resistance, anti-wear and low temperature properties.

Silicone oil is a commonly used base oil in lubricating oil for precision instruments. The silicon-oxygen bond energy in the silicone oil is as high as 1014.2kJ/mol, which makes the silicone oil have excellent thermal stability and oxidation resistance, which can ensure that the decomposition reaction is not easy to occur under high temperature conditions. , so as not to damage the quality of the oil, and the silicone oil also has excellent low temperature resistance, and the pour point can be lower than -50 ℃. The viscosity-temperature performance of silicone oil is smaller than that of mineral oil, and the viscosity changes little with temperature, so that the same lubricating performance can be maintained under the condition of little temperature change, which ensures the accurate operation of precision instruments. The stable chemical properties of silicone oil also endow it with good anti-rust performance, which protects the internal parts of precision equipment from rusting, and the shelf life of silicone oil is very long.

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