Research Progress on Halogen-free Flame Retardant Rigid Polyurethane Foam
LIN Shaoling1, LUO Zuhuo1, CHEN Danqing2, ZHAO Xiaomin2, CHEN Guohua2
1 College of Chemical Engineering, Huaqiao University, Xiamen 361021, China 2 College of Materials Science and Engineering, Huaqiao University, Xiamen 361021, China
Abstract: Rigid polyurethane foam (RPUF) has been widely used in a variety of fields such as architecture and transportation, due to its unique properties like low density, low thermal conductivity coefficient, and excellent dimensional stability. However, there is a great fire hazard in use because of its flammability and mostly accompanied by the production of toxic gases and smoke during the combustion. Therefore, it is essential to improve the flame retardancy of RPUF. Halogen-containing materials will release corrosive gases (hydrogen halide, etc.) and toxic carcinogens (PBDD, etc.) during combustion. At present, a variety of halogen-based flame retardants are forbidden by European Union RoHS directive and Stockholm Convention of United Nations Environment Programme. Therefore, the development and application of new environment-friendly halogen-free flame retardants need to be developed urgently. In recent year, halogen-free flame retardants have been used in the research of RPUF flame retardant modification such as phosphorus-containing flame retardant, nitrogen-containing flame retardant, inorganic flame retardant and intumescent flame retardant. The combustion degradation process and flame retardant mechanisms of RPUF were reviewed. In this paper, the latest development of flame retardant, including additive flame retardants, reactive flame retar-dants and nano-composite flame retardants used in RPUF in recent years was summarized. The flame-retardant mechanism of different flame-retardant systems were described. Developing high efficiency, halogen-free, green reactive flame retar-dants, and strengthening research on raw material sources of biomass polyurethane and modification of biomass polyurethane should be the future development trend of flame retardant RPUF.
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