Method for testing oil oxidation stability

Abstract

The invention relates to a method for testing oil oxidation stability. The method comprises the following steps of: supplying an oil processing device which comprises a thermostatic container and an oil container, wherein the oil container is arranged in the thermostatic container and is provided with an air intake pipe and an air outlet pipe; feeding the tested oil and a metal catalyst into the oil container; introducing air into the tested oil via the air intake pipe, wherein the flow of the air is 1 L / H to 20 L / H; measuring the temperature of the tested oil, orderly extracting samples from the tested oil according to a predetermined time sequence after the temperature of the tested oil is up to a set value, and measuring the viscosity, the acid value, the oxidation value and the nitration value of each sample; and measuring the content of an insoluble substance (n-pentane) of the remained oil in the oil container. Through the method, the samples can be sampled by many times during the testing process, so that a performance change trend of the oil is obtained; and the detergent dispersibility and the thermal oxidation stability of the oil can be evaluated.

Description

technical field [0001] The invention relates to a test method for oxidation stability, in particular to a test method which can take multiple samples and simultaneously evaluate the clean dispersibility and thermal oxidation stability of oil products. Background technique [0002] The ability of petroleum products to resist permanent changes in their properties due to the action of air (or oxygen) is called the oxidation stability of oil products. This project is one of the quality indicators that must be controlled for lubricating oil products. It is more important for long-term cycle use of steam turbine oil, transformer oil, internal combustion engine oil, and air compressor oil that is in contact with a large amount of compressed air. [0003] There are many methods for measuring the oxidation stability of lubricating oil in the current technology, and the principles are basically the same. Generally, oxygen is directly introduced into the sample or purified dry air. Un...

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Problems solved by technology

[0004] The above method cannot take samples continuously, and monitor the change of oil performance with the test time

Especially in the development stage of new oil products or new standards, the end time of the test cannot be adjusted arbitrarily according to the results of the intermediate test

At the same time, the above method only evaluates the oxidation stability of the oil, and does not test the detergency and dispersibility closely related to it.

[0005] It can be seen that the above-mentioned existing oil oxidation stability test method has inconvenience and defects, and needs to be further improved urgently.

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