Effect of several ingredients in the rubber on adhesion characteristics between brass-plated steel cord and rubber was thoroughly investigated. Amine component is generated by N,N'-dicyclohexylbenzothiazole-sulphenamide- (DCBS) accelerated sulfur vulcanization, and it is known to promote stress-induced corrosion crack in the brass layer at the brass plated steel cord. Hexamethoxymethylmelamine (HMMM), which is formulated for the condensation reaction of RF resin, has a function to trap amines, which was found to effectively improve the adhesive strength in water-aged degradation. It was clarified that the physical properties of the vulcanized rubber such as crosslink density and strain modulus are also improved by trapping the residual amine accompanying improved adhesive strength for the formulation with HMMM. Influence of carbon black on concentration of the residual amine and adhesive strength was also studied. Amount of the amine was inversely proportional to the carbon gel content, while adhesive strength linearly increased with the level of carbon gel. It was assumed that the carbon black dose enhances the adhesive strength due to a preferential entrapment of the amine at the stage of carbon gel formation.

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