One way to optimize composite mechanical properties is through hybridization with small amounts of reinforcing fillers. Thus, this study investigates the effect of incorporation of 3 wt% of clay (BT) and organoclay (OBT) on the properties of a recycled wood plastic composite (WPC) based on HDPE and 20 wt% of coir fiber compounded with 5 wt% of maleic anhydride-grafted polypropylene (PP-g-MA), as coupling agent, and 5 wt% of Struktol TPW 113, as lubricating agent. Raw materials were characterized by X-ray fluorescence (XRF), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM) and thermogravimetric analysis (TGA). Coir fiber was characterized by optical microscopy and TGA. Wood plastic formulations (with clay and organoclay) were prepared in an internal mixer coupled to a torque rheometer operating at 190°C, 60 rpm for 10 min. Then, the mixtures were compression molded. Formulations were characterized by SEM, TGA, DSC, tensile and water absorption tests. FTIR analysis showed the characteristic bands of organophilic clay. XRD showed an increment in the interplanar distance of the clay, after the incorporation of quaternary ammonium salt (distearyl dimethyl ammonium chloride, Praepagen® WB), confirming the organoclay formation. Organophilization decreases the clay hydrophilic character and reduces the water uptake of WPC-BT. Despite the fact that BT incorporation led to WPC nanocomposite with intercalated structure, this WPC-clay composition did not show a significant increase in tensile strength and elongation at break. The poor interfacial adhesion between the raw materials and the polymer matrix, the low aspect ratio provided by coir fibers and also, the partially intercalated structure of composites have contributed to this behavior.

优化复合材料机械性能的一种方法是与少量增强填料混合。因此，本研究调查了掺入 3 wt% 粘土 (BT) 和有机粘土 (OBT) 对基于 HDPE 和 20 wt% 椰壳纤维与 5 wt% 椰壳纤维复合的再生木塑复合材料 (WPC) 性能的影响马来酸酐接枝聚丙烯 (PP-g-MA) 作为偶联剂，5 wt% 的 Struktol TPW 113 作为润滑剂。通过X射线荧光（XRF）、傅里叶变换红外光谱（FTIR）、X射线衍射（XRD）、扫描电子显微镜（SEM）和热重分析（TGA）对原材料进行表征。椰壳纤维通过光学显微镜和 TGA 表征。木塑配方（含粘土和有机粘土）在密闭式混合器中制备，该混合器与扭矩流变仪在 190°C、60 rpm 下运行 10 分钟。然后，将混合物压塑。通过SEM、TGA、DSC、拉伸和吸水率测试表征制剂。FTIR 分析显示了亲有机粘土的特征谱带。在加入季铵盐（二硬脂基二甲基氯化铵，Praepagen® WB）后，XRD 显示粘土的晶面间距增加，证实了有机粘土的形成。亲有机化降低了粘土的亲水特性并降低了 WPC-BT 的吸水率。尽管 BT 的掺入导致 WPC 纳米复合材料具有插层结构，这种 WPC-粘土组合物在拉伸强度和断裂伸长率方面没有显着增加。原材料和聚合物基体之间较差的界面附着力、椰壳纤维提供的低纵横比以及复合材料的部分嵌入结构都促成了这种行为。