Lubricating oil rotary oxygen bomb oxidation stability determination solution
Oxidation stability refers to the service life of lubricating oil. When lubricating oil is used for a longer time, it is constantly in contact with external oxygen, water, dust, etc., resulting in shorter and shorter life of oil products. Generally, the oxidation stability test of the oil is rotating oxygen bomb. The longer the time of rotating oxygen bomb test, the better the oxidation stability of the oil.
The resistance of a lubricating oil to oxidative deterioration is called the stability of the lubricating oil. The stability of lubricating oil is divided into antioxidant stability and thermal oxidation stability. One is oxidation stability, is the thick layer of lubricating oil (oil layer thickness more than 200μm) under the action of high temperature and oxygen in the air, the ability to resist oxidation, lubricating oil at room temperature is very stable, but at high temperature, a very short time oil black, viscosity change, acid value increase, precipitation. Lubricants generally do not readily oxidize below 30°C, but oxidation occurs vigorously above 150°C. Such is the case, for example, with the oxidation of lubricants in internal combustion engine oil, gear boxes, transformers or pipelines. Therefore, lubricating oil is required to have good oxidation resistance. Some lubricants are added to improve antioxidant stability. The other is thermal oxidation stability, which is the ability of thin lubricating oil (oil layer thickness less than 200μm) to resist oxidation under the action of oxygen in the air at high temperature. This is the case, for example, between the piston and cylinder of an internal combustion engine and between the bushing of a steam turbine. At this time, the working temperature of the lubricating oil is high (200-300°C), and the catalytic oxidation of the metal on the lubricating oil is also strong. Oxidation results will generate a layer of strong adhesive film, covering the metal parts, increasing wear, power reduction, difficult heat conduction, serious will lead to burning parts.
SH0193C automatic rotary oxygen bomb tester is designed and manufactured according to the national standard ASTMD2272-2009 "Lubricating oil oxidation stability determination Method" metal bath standard. Suitable for evaluating the oxidation stability of new and in-service steam turbine oils of the same composition (base oils and additives). It can also be used to evaluate the oxidation stability of new mineral insulating oils containing 2, 6- di-tert-butylp-cresol. The test results were used to verify that new mineral insulating oils containing 2, 6-di-tert-butyl-p-cresol or 2, 6-di-tert-butyl-p-cresol or both could be continuously controlled for each batch of oil.