二次正交旋转试验对麦秸塑料复合材料冲击强度影响

选用农作物秸秆-麦秸粉和热塑性塑料-高密度聚乙烯（HDPE）为原料，添加马来酸酐接枝聚乙烯（MAPE）为改性剂，利用单双螺杆挤出机组，采用熔融挤出方式制备麦秸塑料复合材料。在其它条件固定的情况下，研究双螺杆挤出机温度、转速和麦秸粉含量等因素对麦秸塑料复合材料冲击强度的影响，设计二次正交旋转回归组合试验方案对双螺杆挤出工艺进行优化。麦秸塑料复合材料的冲击强度与双螺杆挤出机的温度和转速以及原料中麦秸粉添加比例存在一定的相关性，通过试验建立了麦秸塑料复合材料冲击强度（y）对双螺杆挤出机温度（x1）、转速（x2）、麦秸粉比例（x3）三个试验因素之间的正交回归模型方程：y=17．98106—0．82505x1^2-0．94349x2^2-1．00182x3^2；；从模型推知，当温度为160℃、双螺杆转速为30rpm和麦秸粉用量为60％时，冲击强度达到最大值17．98kJ／m2，实验验证结果与模型值相符。研究结果对提高麦秸塑料复合材料冲击强度和优化工艺参数具有重要的指导意义和应用价值。

Improvement of Impact Strength of Wheat Straw Plastic Composites by Quadratic Orthogonal Rotating Regression

Crop straw, wheat straw powder, and thermoplastic plastics-high density polyethylene （HDPE） were selected as raw material by adding maleic anhydride grafted polyethylene（MAPE） to produce wheat straw plastic composites through melting extrusion mould. When the other conditions were fixed, the impacts of twin-screw extruder temperature, speed, ratio of wheat straw powder, and other factors on the mechanical properties of wheat straw plastic composites were discussed, and the optimized processes were ob- tained by quadratic orthogonal rotating regressive design. The orthogonal regression model was established between impact strength of wheat straw plastic composites（y）and twin-screw extruder temperature （xl）, speed （x2 ）, ratio of wheat straw powder（ x3 ）and the model equation was y = 17.98106 - 0. 82505x1 2 - 0. 94349x22 - 1. 00182xZ3. The results concluded that the impact strength were the maximum with value of 17.98 kJ/m2 when the win-screw extruder temperature was 160℃, speed was 30rpm, ratio of wheat straw powder was 60%, which matched well with the model value. The results have important significance and application value to improve the impact strength of wheat straw plastic composites and process parameters optimization.