水道水残留塩素に侵されるＥＰＤＭパッキンの劣化メカニズム

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タイトル別名
  • The Degradation Mechanism of EPDM Packing by Chlorine in City Water.
  • スイドウスイ ザンリュウ エンソ ニ オカサレル EPDM パッキン ノ レッカ メカニズム

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In order to elucidate the degradation mechanism of EPDM rubber caused by a amount of chlorine in city water, EPDM rubbers containing 2 kinds of carbon black (ie. HAF and FT) were employed and corroded in chlorine water, Their morphology changes before and after degradation were observed by SEM. The effect of the amount of moisture Was examined by EPMA. The degradation mechanism was studied by XPS and 13C-NMR. The EPDM rubber loaded HAF was easier to absorb chlorine and to be deteriorated than the one loaded FT. As a result of XPS measurement, Cl (2p) peak was detected from the sample after degradation treatment. 13C-NMR measurement revealed that the methyl group of diene side chain of EPDM rubber was changed into the chlorinated methyl group. It was thought that as the chlorinated methyl group reacted with the other molecular chains of EPDM rubber, the crosslinking density increased. Therefore, the degraded EPDM rubber was brittle, collapsed and fell off.

収録刊行物

  • 日本ゴム協会誌

    日本ゴム協会誌 75 (7), 313-317, 2002

    一般社団法人 日本ゴム協会

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