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Brake pad waste (BPW) powders were incorporated into styrene-butadiene rubber (SBR) formulations with varying amounts [2.5, 5, 10, 15, 20 and 40 parts per hundred parts of resin (phr)], by replacing the same amount of carbon black (CB). The physico-mechanical properties of the SBR/CB/BPW vulcanizates were determined before and after heat aging at 90°C. There was a slight reduction in the tensile strength, tensile modulus and surface hardness, as the BPW filler content was increased in SBR vulcanizates, up to 5 phr of BPW content, and a further increase in the waste filler content reduced the property significantly. A significant improvement in the compression set was noticed up to 20 phr BPW content loaded SBR systems. This is due to the synergistic effect of CB and the BPW filler. Swelling studies in different aromatic organic solvents, and the rheological behaviors of SBR/CB/BPW, were also studied. The swelling index of all formulations increased and the crosslink density decreased, with increase in BPW content. The degree of reinforcement between the elastomer and the BPW was studied using the Kraus equation.

Effect of brake pad waste powder incorporation on the performance of styrene-butadiene rubber vulcanizates