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What is the quality of vacuum grease in use? How to identify

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What is the quality of vacuum grease in use? How to identify

Date:2017-07-03 Author:senleijidian Click:

What is the quality of vacuum grease in use? How to identify

1, vacuum grease in the working parts due to the external environment (such as air, water, dust or other harmful gases, etc.), and the relative movement of the working parts to produce mechanical force (such as stamping, cutting, etc.) will occur chemical and Physical change.

Chemical change. Lubricating grease (base oil, thickener) due to the role of light, heat and air, may occur oxidative deterioration, the base oil is oxidized after the ion of trace organic acids, aldehydes, ketones and internal fat and other components, thickener Fatty acids and organic metal salts are likely to decompose to form trace amounts of organic acids. Therefore, acidity (increased acidity of the grease) results in corrosion of the lubricated parts and corrosion and loss of lubrication and protection.

Physical change. Due to the mechanical effect of the grease structure deterioration and even damage, grease consistency decreased, poor lubrication performance; or because the mechanical lubrication parts sealing conditions are not good, resulting in grease mixed with lime, impurities and moisture leaving the grease quality deterioration The

2, identify the method

Vacuum grease with the naked eye or feel dust, mechanical impurities, or mixed with moisture into the grease and whitening, light, or consistency significantly smaller, or obvious smell of oil rancidity, etc., can explain the deterioration of grease. Using the instrumental analysis method, the most direct identification is to take a small amount of used samples with infrared spectrometer to determine whether the sample 1720cm- absorption peak. Or the determination of the absorption peak of the sample before and after use (carbon index of 1710cm-, with the absorption peak of 1378cm-); or directly determine the acid value of the sample, if the acid value is greater than 1.0mg (KOW) / g Indicating that the grease has begun to deteriorate.


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