INHERENTLY FLAME-RETARDANT RIGID POLYURETHANE FOAMS BASED ON NEW TRIAZINIC POLYETHER POLYOLS

The synthesis of new triazinic polyols by oxyalkylation with the propy leneoxide of some well known condensation products derived from melami ne (2,4,6-triamino-1,3,5-triazine), a heteroaromatic chain initiator, has been studied. By using the synthesized aromatic triazinic polyols in conventional foaming processes, rigid polyurethane foams with excel lent physico-mechanical properties and inherent flame retardancy are o btained, better than those of rigid polyurethane foams derived from co nventional aliphatic polyols based on sucrose. A new additive flame re tardant with a similar heteroaromatic triazinic structure (1,3,5-trich lormethylisocyanurate) was also successfully evaluated. The non expens ive and accessible raw materials, the facility of the reactions involv ed in this kind of synthesis, make the studied method very attractive from technological points of view.