Additivverträglichkeit

Influence of various additives on elastomers and the tribological properties in the Radiai shaft seal system FKM 2012
Issue number 318
Project no. 290

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Abstract:
The use of a more efficient lubricant can often improve the properties of an overall product. Synthetic lubricants are preferred because they are more efficient than mineral lubricants. A further targeted increase in performance can be achieved by adding suitable additives to the fluids.
There have been an increasing number of failures in sealing systems in which a highly additivated synthetic fluid is used. It has not yet been possible to determine which additives dissolved in synthetic base oils are incompatible with radial shaft seals made of different materials in dynamic operation.
In this research project, various dynamic and static investigations were carried out with regard to compatibility within the radial shaft seal sealing system. The research project is divided into two project sections. First, synthetic base oils with only one dissolved additive are used. In the second project phase, synthetic base oils with several dissolved additives are used.
Within the research project, extensive findings were made on the influence of additives with regard to the frictional torque, the conveying value, the functional and wear behavior of sealing systems with radial shaft seals made of elastomer.
The wetting behavior and the material characteristics after static storage of elastomer samples were also included.
The selective influence of individual additives was demonstrated. The basic influences of the material of the rotary shaft seal and the base oil were determined. The necessity of dynamic testing to determine compatibility was demonstrated.
Static storage tests alone are unsuitable for determining the dynamic functional behavior of the radial shaft seal sealing systems.