Promotion effect of a chlorotriazine derivative on the adhesion between rubber compounds and a brass-plated steel cord

The adhesion between chlorotriazine derivative (TZ)-loaded rubber compounds and a brass-plated steel cord was studied to understand how TZ acted as an adhesion promoter. With the loading of the rubber compound with TZ, the cu re rate became slow, but changes in the physical properties were not signif icant, An improvement in adhesion was obvious at a low TZ loading ranging f rom 0.5 to 2.0 phr. An adverse effect was observed with high loadings up to 8 phr and aging treatments for 15 days, Since the concentration of sulfur in the interphase of the rubber compound/brass film adhesion samples after humidity aging was high for the rubber compound with high loadings of TZ, t he acceleration of sulfide formation by TZ loading was confirmed. Lack of o xygen in the interphase indicated the conversion of zinc oxide to zinc sulf ide in the rubber compound containing TZ, The control of zinc oxide formati on in the adhesion interphase by TZ is suggested to be the reason for the a dhesion promotion by TZ.