PREPARATION, CHARACTERIZATION AND FLAME RETARDANCY OF POLYURETHANE COMPOSITES CONTAINING MICROENCAPSULATED AMMONIUM POLYPHOSPHATE

摘要

In this study,a novel microcapsulated flame retardant containing ammonium polyphosphate(APP) and an 4,4'-oxydianiline-formaldehyde (OF) resin as the core and shell material was synthesized using in situ polymerization technology.The thermal properties and flame retardancy tests,such as limiting oxygen indexand UL-94,were conducted to evaluate the effect of varying the composition of APP and OFAPP.The results revealed that the flame retardancy of the Si-PU/OFAPP composite (LOI =37％) was higher than that of the Si-PU/APP composite (LOI =23％) at the same additive loading.