Fireproof polystyrene foam, used for insulation e.g. in buildings, cars or furniture, comprises a mixture of styrene polymer, phenolic resin and expandable graphite

摘要

Fire-resistant polystyrene-based foam comprises a mixture of (A) 90-10 wt% styrene polymer (PS) and (B) 10-90 wt% phenolic resin, with the addition of (C) 5-50 wt% expandable graphite (based on mixture A + B). Independent claims are also included for (a) a process for the production of PS particle mouldings by making a mixture of phenolic resin, hardener and blowing agent and/or other conventional additives, mixing this with unexpanded PS beads, mixing the phenolic resin-coated or -wetted beads with expandable graphite (C), introducing the mixture into a mould and sintering by the standard steam shock method; (b) an alternative process involving mixing PS beads with (C), combining the coated beads with the resin/hardener/blowing agent mixture, curing the phenolic resin in a mould and sintering as in (a).