Abstract: The necessity and importance of halogen-free flame retardants for polyurethane foam (PUF) were presented. And the flame-retardant mechanism of PUF composites was introduced. Both the reactive and additive halogen-free flame retardants for polyurethane foams were summarized. Additive flame retardants included organic and inorganic additive. Additionally，expandable graphite (EG) as an intumescent flame retardant in polyurethane foams was reviewed. Finally，the development trend of the halogen-free flame retardants for PUF was prospected.

Key words: polyurethane, flame-retardant, halogen-free, expandable graphite

摘要： 简要介绍了研究无卤阻燃技术对聚氨酯泡沫塑料（PUF）阻燃的必要性和重要性，并对不同类型阻燃剂对PUF的阻燃剂机理做了介绍。较全面地综述了反应型和添加型无卤阻燃剂对PUF阻燃的研究进展。其包括添加型阻燃剂中的有机添加型和无机添加型阻燃剂。另外，在无机膨胀型阻燃剂中，特别介绍无卤可膨胀石墨（EG）对PUF阻燃的研究进展。最后指出功能化的核壳结构无卤复合阻燃剂将是聚氨酯泡沫塑料无卤阻燃技术研究和发展的必然趋势。

关键词: 聚氨酯, 阻燃, 无卤, 可膨胀石墨