Recently, scientists have reported that polyurethanes based on hydroxy ammonium polyphosphate have good flame retardancy and smoke suppression effect.
At the same time, in order to improve the compatibility and the flame retardancy and mechanical properties of ammonium polyphosphate (APP)-based polyurethanes, an effective and simple method was developed to generate hydroxyl ammonium polyphosphate (HAPP) through the ion exchange reaction of APP with 3-aminopropanol. ), followed by chemical crosslinking, as a solvent-free two-component polyurethane (2K-PU) complex functional adjuvant.
Significantly reduce heat and smoke
Detailed evaluation of the curing behavior, mechanical properties and flame retardancy of HAPP-cured two-component polyurethanes was named 2K-PU/HAPP. The cone calorimeter results showed that the two-component polyurethane containing 15% HAPP (by Mass), significantly reduced peak heat release rate (PHRR) of 68.7%, total heat release (THR) of 42.8%, and total smoke volume (TSP) of 9.3%.
Industrial application potential
Interestingly, the mechanical performance tests showed that the chemical incorporation of HAPP significantly increased the tensile strength of 2K-PU/HAPP, and at the same time maintained a good elongation at break. In addition, the flame retardance mechanism of 2K-PU/HAPP was also Been proposed.