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以聚磷酸铵(APP)作为阻燃剂,用挤出成型法制备具有阻燃性的PE基木塑复合材料,研究APP含量对木塑复合材料的静态力学性能以及动态力学性能的影响。静态力学研究结果表明:加入APP的木塑复合材料的弯曲强度和冲击强度均比未加入APP的木塑复合材料有所增加,当APP质量含量为16%时,弯曲强度和冲击强度均达到最大值,分别为66.94 MPa和13.38 kJ/m2;动态力学研究结果表明:不同APP含量的木塑复合材料在60.2～70.4℃之间均存在明显的松弛,当温度低于松弛温度时,木塑复合材料的存储模量(E’)较大,而温度高于松弛温度时,木塑复合材料的存储模量明显减小;随着APP含量增加,木塑复合材料的损耗模量(E″)和损耗因子(tanδ)均先降低然后升高。
Ammonium polyphosphate (APP) was used as flame retardant to prepare flame-retardant PE-based wood-plastic composites by extrusion molding. The effects of APP content on static mechanical properties and dynamic mechanical properties of wood-plastic composites were studied. The results of static mechanics show that the bending strength and the impact strength of the wood-plastic composites with APP are both increased compared with the wood-plastic composites without APP. When the APP mass content is 16%, the flexural strength and impact strength reach the maximum Values of 66.94 MPa and 13.38 kJ / m2, respectively. The results of dynamic mechanics study showed that wood-plastic composites with different contents of APP had significant relaxation between 60.2 and 70.4 ℃. When the temperature was below the relaxation temperature, The storage modulus (E ’) of the wood-plastic composites is larger, while the storage modulus of wood-plastic composites decreases obviously when the temperature is higher than the relaxation temperature. With the increase of APP content, the loss modulus (E " And loss factor (tan δ) are both decreased and then increased.