Effects of Expandable Graphite and Ammonium Polyphosphate on the Flame-Retardant and Mechanical Properties of Rigid Polyurethane Foams
Effects of Expandable Graphite and Ammonium Polyphosphate on the Flame-Retardant and Mechanical Properties of Rigid Polyurethane Foams
复制标题
可膨胀石墨和聚磷酸铵对硬质聚氨酯泡沫阻燃和力学性能的影响
DOI：
10.1002/app.30485
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发表时间：
2009-10-15
影响因子：
3
通讯作者：
Li, Zhong-Ming
中科院分区：
文献类型：
--
作者：
Meng, Xian-Yan;Ye, Ling;Li, Zhong-Ming
研究了可膨胀石墨（EG）和聚磷酸铵（APP）对硬质聚氨酯泡沫塑料（RPUF）阻燃性能和力学性能的影响。结果表明，EG和APP均能有效地提高RPUF的阻燃性能，但EG的阻燃效果优于APP，当阻燃剂用量为15wt%时，填充RPUF的极限氧指数（LOI）分别为24.5和32 vol %。根据氧指数测试，RPUF复合材料中APP与EG的最佳质量比为1：1，此时15wt%（APP + EG）/RPUF的氧指数为30.5vol%。通过热重分析对RPUF复合材料的热降解性能进行了测试，结果表明，APP和EG的加入会导致RPUF中高温残留物的增加。在相同条件下，EG/RPUF的残留量小于APP/RPUF。压缩试验和动态热机械分析表明，在RPUF中分别填充EG和APP，材料的压缩强度和压缩模量都有一定程度的下降，而在RPUF中添加EG和APP的混合物，材料的力学性能有所提高。(C)2009 Wiley Periodicals，Inc. J Appl Polym Sci 114：853-863，2009
hi this work, the effect of expandable graphite (EG) and ammonium polyphosphate (APP) on the flame retardancy and mechanical properties of the rigid polyurethane foam (RPUF) was studied. The results indicated that both EG and APP Could effectively improve the flame retardancy of RPUF, while the retardancy of EG was better than APP. When the flame-retardant loading was 15 wt %, the limited oxygen index (LOI) values of APP- and EG-filled RPUF were 24.5 and 32 vol %, respectively. According to the LOI test, the optimal ratio of APP to EG in RPUF composites was 1 : 1 by weight, at which the LOI value of 15 wt % (APP + EG)/RPUF was 30.5 vol %. Thermal degradation test of RPUF composites by thermogravimetric analysis indicated that the addition of APP and EG to RPUF could lead to an increase in the amount of high-temperature residue. Under the same conditions, the residue amount of EG/RPUF was less than that of APP/RPUF at the same temperature. Compression test and dynamic thermal mechanical analysis indicated that both the compressive strength and modulus decreased at a certain extent with the EG- or APP-filled into RPUF, respectively, but with the mixture of EG and APP added into RPUF, the mechanical properties of these materials increased. (C) 2009 Wiley Periodicals, Inc. J Appl Polym Sci 114: 853-863, 2009