Discussion about the Trend of Flame-retardant Technique of Using Rigid Polyurethane Foams

With the widespread application of rigid polyurethane foams in various engineering fields,their flameretardant properties are receiving attention increasingly.This article introduces the development of the research of flame-retardant technique by using polyurethane foams at home and abroad.It analyzes the flame-retardant mechanism by using polyurethane foams and the trend of the research of flame-retardant methods.The paper mainly explains the flame-retardant effect by the combined use of two flame-retardant methods: by the structural modification of the polyurethane molecules and adding compound flame-retardant agent,the oxygen index of the polyurethane foams can be made to reach the national flame-resisting standard.The paper also envisages the prospect of flame-retardant technique by using polyurethane foams.