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J. Zieliński, B. Osowiecka, J. Polaczek, Z. Machowska


Investigation on the effect of addition of various polymers on the kontent of benzo[a]pyrene (BAP) in coal-tar pitch

Polimery 1995, No 10, 591


DOI: dx.doi.org/10.14314/polimery.1995.591

Summary

Studies on the reduction of cancerogeneous BAP content in a commercial coal-tar pitch by the addition of various polymers are import ant both as regards economy and ecology. Homogeneous pitch—polymer compositions can be prepared by mixing the melted components under either destructive (high temperature) or conservative conditions (no structural changes). Effects were studied of adding various polymers [poly(vinyl chloride), polystyrene and several types of butadiene/styrene copolymers] to a pitch in amounts up to 10 mass %, compounding conditions (120—350°C, 2—6 h, and adding plasticizers (anthracene oil, dibutyl phthalate, unsaturated polyester resin of the Poles type), a crosslinking agent (sulphur) for the butadiene/styrene elastomer and a catalyst (FeCl3) for condensation of the groupcomponents of the pitch on the content of BAP and toluene-insoluble components, and the penetration and the softening and dropping points of the resulting compositions were measured. The highest change of BAP kontent (reduction by 46 mass %) was obtained in the composition containing (in relation to pitch) 4.7% PVC + 23.73% anthracene oil + 4.7% butadiene/styrene rubber latex and heated for 1 h at 120—150°C. The mechanism of structural changes in the compositions under study resulting in composition and thermorheological property changes has been discussed.


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