为了优选PP/玉米秸秆复合材料力学性能的工艺参数，并进一步优化其最佳的制备工艺，采用L ₁₆（4⁴）的正交试验设计，制备了不同工艺参数下的PP/玉米秸秆复合材料，分析了木塑比、热压温度、热压时间、热压压力对PP/玉米秸秆复合材料力学性能的影响。结果表明：在木塑比、热压温度、热压时间、热压压力4个因素中，木塑比对PP/玉米秸秆复合材料的力学性能影响最大，其次是热压压力对PP/玉米秸秆复合材料的弯曲强度和冲击强度影响较大，热压温度对PP/玉米秸秆复合材料的拉伸强度影响较大，热压时间对PP/玉米秸秆的各项性能影响最小。当木塑比为4∶6、热压温度为185 ℃、热压时间为10 min、热压压力为2.5 MPa时，其弯曲强度为最大值为39.58 MPa，冲击强度最小；当木塑比为4∶6、热压温度为185 ℃、热压时间为15 min、热压压力为2.5 MPa时，其拉伸强度为最大值为17.18 MPa；当木塑比为3∶7、热压温度为190 ℃、热压时间为15 min、热压压力为2.5 MPa时，其冲击强度为最大值为3.94 kJ/m²，弯曲和拉伸强度均为最小。在不考虑侧重的情况下，得出最优的制备工艺为木塑比4∶6、热压温度185 ℃、热压时间15 min、热压压力2.5 MPa。

In order to optimize the process parameters of the mechanical properties of PP/corn straw composites and further optimize the preparation process, the orthogonal test design of L ₁₆(4⁴) was used to prepare PP/corn straw composites under different process parameters. The effects of wood-plastic ratio, hot pressing temperature, hot pressing time and hot pressing pressure on the mechanical properties of PP/corn straw composites were analyzed. The results showed that the wood-plastic ratio had the greatest influence on the mechanical properties of PP/corn straw composites among the four factors of wood-plastic ratio, hot pressing temperature, hot pressing time and hot pressing pressure. Secondly, the hot pressing pressure has a great influence on the flexural strength and impact strength of PP/corn straw composites, and the hot pressing temperature has a great influence on the tensile strength of PP/corn straw composites, the hot pressing time has the least influence on the properties of PP/corn straw. When the ratio of wood to plastic is 4∶6, the hot pressing temperature is 185 ℃, the hot pressing time is 10 min, and the hot pressing pressure is 2.5 MPa, the flexural strength is the maximum value of 39.58 MPa, and the impact strength is the smallest. When the ratio of wood to plastic is 4∶6, the hot pressing temperature is 185 ℃, the hot pressing time is 15 min, and the hot pressing pressure is 2.5 MPa, the tensile strength is 17.18 MPa. When the ratio of wood to plastic is 3∶7, the hot pressing temperature is 190 ℃, the hot pressing time is 15 min, and the hot pressing pressure is 2.5 MPa, the impact strength is the maximum value of 3.94 kJ/m², and the flexural and tensile strength are the smallest. By comparing the mechanical properties of these three processes, without considering the focus, the optimal preparation process was obtained as follows∶wood-plastic ratio 4∶6, hot pressing temperature 185 ℃, hot pressing time 15 min, hot pressing pressure 2.5 MPa.