Effects of Expandable Graphite and Modified Ammonium Polyphosphate on the Flame-Retardant and Mechanical Properties of Wood Flour-Polypropylene Composites
Effects of Expandable Graphite and Modified Ammonium Polyphosphate on the Flame-Retardant and Mechanical Properties of Wood Flour-Polypropylene Composites
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DOI：
10.1177/096739111302100706
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发表时间：
2013-01-01
影响因子：
2.1
通讯作者：
Lv, Jianxiong
中科院分区：
文献类型：
--
作者：
Guo, Chuigen;Zhou, Lin;Lv, Jianxiong
本文研究了3-（甲基丙烯氧基）丙基三甲氧基硅烷（M-APP）改性的可膨胀石墨（EG）和聚磷酸铵（M-APP）对木-聚丙烯复合材料（WPC）的阻燃性和力学性能的影响。锥量热法结果表明，EG和M-APP均能有效提高木塑的阻燃性，且EG的阻燃性优于M-APP。当阻燃剂用量为25 wt.%时，M-APP填充的WPC （M-APP/WPC）和EG/WPC （EG/WPC）的极限氧指数（LOI）分别为30.7%和37.9%。根据LOT试验，木塑中M-APP与EG的最佳配比为重量比1:1，木塑的LOT值为39.3%。热重分析（TG）结果表明，在WPC中添加M-APP和EG可导致炭渣的增加。在相同条件下，EG与M-APP混合填充（比例为1:1）的复合材料的炭渣大于在相同温度下单独填充的复合材料。EG的掺入使复合材料的抗拉强度和抗弯强度均有一定程度的下降，而M-APP的掺入使复合材料的力学性能有所提高。在M-APP与EG的比例为1:1时，复合材料的力学性能没有明显下降，阻燃性高于M-APP填充的木塑复合材料。
In this work, the effect of both the expandable graphite (EG) and ammonium polyphosphate modified with 3-(methylacryloxyl) propyltrimethoxy silane (M-APP) on the flame retardancy and mechanical properties of the wood-polypropylene composites (WPC) were studied. Cone calorimetry results indicated that both EG and M-APP could effectively improve the flame retardancy of WPC, while the retardancy of EG was better than that of M-APP. When the flame-retardant loading was 25 wt.%, the limiting oxygen index (LOI) values of M-APP-filled WPC (M-APP/WPC) and EG-filled WPC (EG/WPC) were 30.7% and 37.9%, respectively. According to the LOT test, the optimal ratio of M-APP to EG in WPC was 1:1 by weight, at which the LOT value of WPC was 39.3%. Thermogravimetric analysis (TG) results indicated that the addition of M-APP and EG to WPC could lead to an increase of char residue. Under the same conditions, the char residue of composite filled with the mixture of EG and M-APP (at a ratio of 1:1) was greater than that of composites filled individually at the same temperature. Both the tensile strength and flexural strength decreased at a certain extent due to incorporation of EG into WPC, but with the addition of the M-APP, the mechanical properties of these composite samples increased. At the ratio of 1:1 (M-APP to EG), the mechanical properties of the composite were not obviously decreased, and the flame retardancy was higher than the M-APP-filled WPC composites.