An experimental mixture design was used to determine the optimum composition of wood–plastic composites (WPCs), manufactured from recycled polypropylene (rPP), rubberwood flour (RWF), calcium carbonate (CC), maleic anhydride-grafted polypropylene (MAPP), ultraviolet (UV) stabilizer, and lubricant (Lub). The composite samples were prepared by extrusion and compression molding. The effects of varying compositions were evaluated using analysis of variance (ANOVA) and response surface methodology (RSM). The results showed that all of the factors significantly (p < 0.05) affected on the properties of the composites. The mechanical properties decreased after natural weathering for periods of 30 and 90 days and immersion in water for similar periods. Increasing the CC content increased the flexural strength, modulus, and hardness, but decreased the water absorption and thickness swelling. Natural weathering sharply changed the lightness and discoloration; whereas, the proportions of rPP and RWF in the composites caused smaller changes. The optimal formulation was determined with regard to the overall properties and consisted of 52.1 wt% rPP, 35.9 wt% RWF, 6.9 wt% CC, 3.9 wt% MAPP, 0.2 wt% UV stabilizer, and 1.0 wt% Lub. The desirability of the overall properties was 0.767, suggesting that the model was able to predict the response to an adequate extent of 76.7%. The experimental results were found to be in a good agreement with the predicted results from RSM within a 5% error.

实验混合物设计用于确定由再生聚丙烯（rPP），橡胶木粉（RWF），碳酸钙（CC），马来酸酐接枝聚丙烯（MAPP），紫外线制成的木塑复合材料（WPC）的最佳组成（UV）稳定剂和润滑剂（Lub）。通过挤出和压缩成型制备复合样品。使用方差分析（ANOVA）和响应面方法（RSM）评估了各种成分的效果。结果表明，所有因素均显着（p <0.05）影响复合材料的性能。在自然风化30天和90天并浸入水中相似的时间后，机械性能下降。CC含量的增加增加了挠曲强度，模量和硬度，但降低了吸水率和厚度溶胀。自然风化极大地改变了亮度和变色。然而，rPP和RWF在复合材料中的比例引起较小的变化。确定了最佳配方，包括52.1 wt％的rPP，35.9 wt％的RWF，6.9 wt％的CC，3.9 wt％的MAPP，0.2 wt％的UV稳定剂和1.0 wt％的Lub。总体性能的期望值为0.767，这表明该模型能够在76.7％的适当范围内预测响应。