Polylactic acid composite material and preparation method thereof

The invention relates to the technical field of high polymer materials, and provides a polylactic acid composite material and a preparation method thereof. The polylactic acid composite material comprises the following components in parts by weight: 40-60 parts of PLA, 10-20 parts of zinc oxide modified plant fiber, 0-30 parts of PBAT and 0-20 parts of PBS, the zinc oxide modified plant fiber comprises plant fiber and a zinc oxide coating layer, and the zinc oxide coating layer coats the surface of the plant fiber. The polylactic acid composite material has the advantages of high tensile strength, high elongation at break, favorable mechanical properties, favorable degradability and favorable antibacterial property. 本申请涉及高分子材料技术领域，提供了一种聚乳酸复合材料及其制备方法。该聚乳酸复合材料包括如下重量份数的组分：PLA 40～60份、氧化锌改性植物纤维10～20份、PBAT 0～30份、PBS 0～20份，其中，氧化锌改性植物纤维包括植物纤维和氧化锌包覆层，氧化锌包覆层包覆于植物纤维的表面。该聚乳酸复合材料拉伸强度大、断裂伸长率高，具有良好的力学性能，同时还具有良好的可降解性能和抗菌性能。