自動車エンジン用ゴム材料の耐劣化油性

概要

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In recent years, the lubricating engine oil for automobile being aged and deteriorated by heat, air and heavy metals has been observed. For this reasons, the rubber parts during exposure to engine oil at high temperatures has been degradaded by the attack of aggressive oil, which is refered to as sour oil. In order to study, main factors of deterioration of various oil resistant rubbers in sour oil, we develop the new apparatus by sour engine oil produced by air bubbling at high temperature. By using this apparatus, it has been observed that elongation (Eb) and tensile strength (Tb) at break of NBR decreased with the increase of exposure time in sour oil. However, in the case of ACM, the crack initiation before the time to elongation at break in sour oil containing water has been observed. In sour oil containing water, the cracking of ACM has been caused by the attack of the peroxide and the additives in oil. Thus, a higher performance elastomer in engine oil line is expected to be improved. In the laboratory, the best materials to fulfil the conditions mentioned above are ethylene-acrylic eleastomer (Vamac) and highly saturated NBR (Zetpol) in various oil resistant rubbers. These two materials could be improved in its performance concerning sour engine oil containing water or without.
日本ゴム協会の論文