A new group of liquid reactive nitrogen and nitrogen—phosphorus flame retardants
for self-extinguishing polyurethane expanded polymers.
Part I. Synthesis and properties
Polimery 2000, No 3, 184
SummaryTrihydroxymethylmelamine, 1 mol, was made to react with 2–3 mols of diethanoloamine or N-methylethanolamine for 30 min at 80°C to yield reactive (toward isocyanates) liquid flame retardants. Tri(diethanolaminomethyl)melamine, 1 mol, was made to react with 1–3 mols of phosphoric acid at less than 20°C to yield nitrogen—phosphorous flame retardants. No wastes are produced in these reactions. Reactive bromine flame retardants (BBD, dibromoneopentyl glycol (DBNPG), and TBNPA) are soluble (22–35%) in the nitrogen flame retardants (Fig. 2), which makes their combined use possible. The new reactive nitrogen and nitrogen—phosphorus flame retardants are infinitely soluble in Rokopols LM3 and RF551 (Table 5), the polyols used to make rigid polyurethane foams. They can be used as components of homogeneous premixes.