Preparation of Ammonium Polyphosphate Forms II and V and their Use as Flame-Retardants

抄録

Preparation of ammonium polyphosphate form II was made by heating a mixture of ammonium orthophosphate and urea at 280 to 300°C under wet ammonia which was prepared by passing air through 3 to 5% ammonia water. Simple dry process of the preparation of ammonium polyphosphate form V was studied and the ammonium polyphosphate was prepared by heating a mixture of ammonium orthophosphate and urea at 330 to 340°C under wet ammonia which was made by passing air through 15 to 29% aqueous ammonia. The ammonium polyphosphates had flame retardation effect to organic polymer materials and the materials containing the ammonium polyphosphates showed an oxygen index higher than 20.