阻燃抗静电木粉-聚丙烯复合材料的制备及性能研究

Preparation and property of flame retardant and anti-static wood flourpolypropylene composites

以木粉和聚丙烯为主要原料,填充改性炭黑(M-CB)和可膨胀石墨(EG)制备阻燃抗静电木粉--聚丙烯木塑复合材料,并进行力学性能、表面电阻率、氧指数及燃烧性能、热失重行为、阻燃性能测试。结果表明:加入15g EG、10g M-CB后,木塑复合材料的拉伸强度、弯曲强度和冲击强度分别增加了2.0%、5.2%和15.6%,电阻率下降到了108Ω;与空白样相比,复合材料的起始分解温度从255.0℃上升到了272.5℃,木粉最高分解温度由349.2℃下降到了287.5℃,聚丙烯的最高分解温度由448.1℃上升到了477.9℃,在800℃下的残炭率由9.9%上升到了33.5%;点燃时间从3 s增加到了14 s,在500 s时总热释放量下降了56.5%,残炭率提高了5倍,表现出显著的阻燃与抗静电性能。

In this paper, with wood flour （WF） and polypropylene （PP） as main raw materials, the WF-PP flame retardant and anti-static composites （WPC） were prepared by filling modified carbon black （M- CB） and expandable graphite （EG）. The mechanical properties, surface resistivity, flame retardancy, thermal degradation and cone calorimetry of WPC were investigated. The results indicated that the tensile strength, flexural strength and Izod impact of WPC with 25% of EG/M-CB （3： 2） showed an improvement of 2.0% , 5.2% and 15.6% ; the resistivity dropped to 10s Ω; compared with the blank sample, the initial decomposition temperature of the composite material increased from 255.0 to 272.5 ℃ , the maximum decomposition temperature with WF decreased from 349.2 to 287.5 ℃ , the maximum decomposition temperature with PP rised from 448.1 to 477.9 ℃ , and the char residue increased from 9.9% to 33.5% ; the ignition time increased from 3 to 14 seconds. The total heat release amount decreased by 56.5% within 500 seconds and carbon residue rate increased five times, showing significant flame retardant and anti-static performance.