Technical Paper Archive

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Aging of Specialty Elastomers Exposed to Lubricants and Additives

A51 giese

Event: 198th Technical Meeting - Fall 2020
Location: Virtual
Date: October 19, 2020
Author: Ulrich Giese
Paper Number: A51

Price: $20.00

  • In a broad spectrum of applications, elastomers have shown themselves to be principally suitable for providing reliable seals in engines, brake systems, exhaust systems, transmissions (radial shaft seals) and hydraulic applications. To be sure, there is a great deal of uncertainty in predicting the functional reliability of such important rubber parts – firstly because the composition of lubricants and generally of media in contact is constantly undergoing changes due to increasing requirements and secondly, because there is no sufficient well-founded knowledge on compatibility or material resistance. So the objective of the investigations carried out is – alongside the evaluation of individual material/lubricant combinations, especially concerning the additives and also the degradation mechanisms. Aging in selected lubricant/additive combinations show that imidazole as anti-corrosion additive is harmful to fluoro rubber concerning decrease in elongation at break and increasing stiffness because of dehydrofluorination and crosslinking reactions. In comparison the additive sarcosine provokes less loss of elongation at break but rather much more swelling. The comparison of bisphenol and peroxide crosslinked fluoro rubber results in higher influence of temperature for the bisphenol system. In case of the additive imidazole the damage of the material was equally. The exposure of NBR elastomers to lubricant/additive systems results under moderate aging temperatures mostly in relative low swelling, but in post crosslinking by peroxo radical initiated reactions. The resistance of HNBR against the Diesel exhaust gas show degradation at higher temperatures. The use of ZnO can stabilize the system by generating a Zn -thiourea complex.

    Papers from 198th Technical Meeting - Fall 2020

    Items from 198th Technical Meeting - Fall 2020