| 초록 |
The adhesion between rubber compound and brass-plated steel cord is slightly enhanced by the addition of a small amount of stearic acid. With low loading at 3 phr, pullout force increases to a small degree. However, with increasing the loading level more than 3 phr, the adhesion property worsens. The small addition of stearic acid is effective on the enhancement of adhesion property before aging, while the stability against aging treatment declines by stearic acid loading. Copper diffusion into the rubber bulk occurs considerably at the adhesion interphase of rubber compound with high loading of stearic acid, and the diffusion increases after aging treatment. The decline of adhesion property by high loading of stearic acid can be attributed to the uncontrolled depletion of ZnO layer at cord surface and accelerated copper diffusion by stearic acid which contributes to the excessive formation of a copper sulfide layer. With an increase in stearic acid loading or in aging time, the addition of stearic acid leads to a decrease of adhesion property because the zinc content at the adhesion interphase becomes too low and the copper sulfide layer too thick.
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