Inherently Flame Retardant Rigid Polyurethane Foams Based on New Triazinic Polyether Polyols

The synthesis of new triazinic polyols by oxyalkylation with the propyleneoxide of some well known condensation products derived from melamine (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 excellent physico-mechanical properties and inherent flame retardancy are obtained, better than those of rigid polyurethane foams derived from conventional aliphatic polyols based on sucrose. A new additive flame retardant with a similar heteroaromatic triazinic structure (1, 3, 5-trichlormethylisocyanurate) was also successfully evaluated. The non expensive and accessible raw materials, the facility of the reactions involved in this kind of synthesis, make the studied method very attractive from technological points of view.