聚磷酸铵型膨胀阻燃剂对聚丙烯的阻燃作用

在改性聚磷酸铵中加入聚己内酰胺（ＰＡ６），可显著提高由它们组成的膨胀型阻燃剂（ＩＦＲ）对聚丙烯（ＰＰ）的阻燃作用，ＰＡ６在其中主要起成炭剂的作用。热重分析表明，当ＩＦＲ－ＰＰ受热燃烧时，ＩＦＲ参与了ＰＰ的成热分解反应并促使部分碳化，元素分析和红外光谱结果表明，ＩＦＲ－ＰＰ受热燃烧时磷主要积聚在燃烧端面并以磷酸及其相应的铵盐存在，它们的形成与ＩＦＲ受热燃烧时的一系列变化有关，并有助于焦化物的进一步炭

FLAME RETARDATION OF AN AMMONIUM POLYPHOSPHATE-BASED INTUMESCENT FLAME RETARDANT ON POLYPROPYLENE

The flame retardation of an modified ammonium polyphosphate based intumescent flame retardant(IFR) on polypropylene(PP) can be greatly improved by incorporating with polycaprolactam(PA6). In the IFR,PA6 acts as a charring agent. Thermogravimetric results indicate that the IFR takes part in the decomposition reactions of PP and promotes it to carbonize as the IFR PP undergoes heating and burning. Elemental analysis and infrared spectrum of the burnt residues and swollen char reveal that the phosphorus is mainly accumulated on the burning surface of IFR PP and exists in the forms of phosphoric acid and its corresponding ammonium salt. Their formations are related to a series of changes of the IFR when the IFR PP on heating and burning and are favourable of further carbonizing and charring of the schorched residue and improving the flame retardance of the material.