Abstract
It was found recently that ethylene-propylene diene rubber (EPDM) compounded with peroxide could be adhered directly to steel during vulcanization after a polymer plating of steel in 6-diallylamino-1, 3, 5-triazine-2, 4-dithiol monosodium (DAN)/sodium carbonate aqueous solution. The rubber adhesion of the polymer plated steel is studied here with emphasis on the effect of the polymer film thickness and the contents of the compounding ingredients, such as HAF carbon black, process oil and peroxide. In order to evaluate the effect of the compounding ingredients, a three variable central composite designed experiment based on a Box-Wilson response surface methodology is employed. The results show that the thickness of the polymer plating film should be controlled in an optimum range from about 20nm to 200nm in order to obtain enough peel strength of adherend. On the other hand, the peel strength is affected by carbon black, process oil and peroxide contents, and high interactions among these factors are observed. These factors show their respective optimum contents, which is explained as a result of the balance of reactions between peroxide/rubber and peroxide/polymer plating film occurred at the adhesion interface during vulcanization. The adherends under the optimum compounding show excellent heat aging resistance, moisture aging resistance, and water aging resistance.
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