Polyurethane foam raw materials and foaming additives

1. polyisocyanate polyurethane foamthe most commonly used polyisocyanate in industrial production is toluene diisocyanate (tdi), polymethylene polyphenyl isocyanate (papi), diphenylmethane diisocyanate (mdi) and liquefied mdi (l-mdi), etc. tdi is mainly used in the foam plastic industry to produce polyurethane soft foam. mdi has greater reactivity than tdi and less volatile toxicity. some liquefied modified mdi…