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通过挤出成型制备了可用于熔融沉积成型(FDM)的聚乳酸(PLA)/麦秸粉复合线材,然后打印成标准测试样条。研究了填充密度、层厚、打印速度、温度对3D打印制品的密度、打印时间、弯曲强度、弯曲模量、冲击强度以及动态力学性能的影响。结果表明:当打印制品的填充密度从20%提高到100%时,可以获得更高的力学性能和模量,弯曲强度、弯曲模量、冲击强度、储能模量分别提高了88.46%、44.20%、75.93%、43.39%,打印时间则延长了50.82%;当层厚从0.2 mm增加到0.7 mm时,制品的弯曲强度、弯曲模量、冲击强度分别下降了42.01%、39.94%、44.27%,但打印时间缩短了70.65%;当打印速度从20 mm/s提高到60 mm/s时,制品的弯曲强度、弯曲模量、冲击强度分别下降了33.52%、39.71%、37.14%,但打印时间缩短了43.75%;此外,温度的升高有利于制品层间的结合,当温度从190℃升至240℃时,制品的弯曲强度、弯曲模量、冲击强度分别提高了55.82%、33.33%、25.08%,但对打印时间没有影响。
A polylactic acid (PLA) / wheat straw powder composite wire that can be used for fused deposition modeling (FDM) was prepared by extrusion molding and then printed as a standard test strip. The effects of filling density, layer thickness, printing speed and temperature on the density, printing time, flexural strength, flexural modulus, impact strength and dynamic mechanical properties of 3D printed products were studied. The results show that higher mechanical properties and modulus can be obtained when the packing density is increased from 20% to 100%. The flexural strength, flexural modulus, impact strength and storage modulus increase by 88.46% and 44.20% respectively. %, 75.93% and 43.39%, respectively. The printing time was extended by 50.82%. When the layer thickness increased from 0.2 mm to 0.7 mm, the bending strength, flexural modulus and impact strength decreased by 42.01%, 39.94% and 44.27% , But the printing time was shortened by 70.65%. When the printing speed increased from 20 mm / s to 60 mm / s, the bending strength, flexural modulus and impact strength decreased by 33.52%, 39.71% and 37.14% The time is shortened by 43.75%; in addition, the temperature is conducive to the combination of product layers, when the temperature rises from 190 ℃ to 240 ℃, the bending strength, flexural modulus and impact strength of the products increase by 55.82% and 33.33% , 25.08%, but did not affect the printing time.