Nanocrystalline cellulose (NCC) and micro-powdered cellulose (MPC) were extracted from rice straw by mechanical and alkali treatment methods, then characterized via infrared spectroscopy and dynamic light scattering. A series of polyurethane nanocrystalline cellulose composite (PNCCC) and polyurethane micro-powdered cellulose composite (PMPCC) coatings were prepared with various loading levels of NCC and MPC from 0.5 to 2.0 wt.%, and the coatings were applied onto the pretreated mild steel substrate at room temperature. The results showed that the NCC and MPC influenced positively the studied properties of the polyurethane coating; furthermore the most pronounced anticorrosive properties were obtained at 1 wt.% NCC and MPC, as confirmed by open circuit potential (OCP) study, electrochemical impedance spectroscopy (EIS) study and salt spray test. However, the optimum enhancement of mechanical properties was found at 1.5 wt.% loading level, after which further loading of NCC and MPC led to the reduction in the mechanical properties.

通过机械和碱处理方法从稻草中提取了纳米晶纤维素（NCC）和微粉化纤维素（MPC），然后通过红外光谱和动态光散射进行了表征。制备了一系列的NCC和MPC含量为0.5至2.0 wt。％的聚氨酯纳米晶纤维素复合物（PNCCC）和聚氨酯微粉纤维素复合物（PMPCC）涂料，并将该涂料施涂到预处理的低碳钢基材上在室温下。结果表明，NCC和MPC对聚氨酯涂料的研究性能有积极影响。此外，通过开路电势（OCP）研究，电化学阻抗谱（EIS）研究和盐雾测试证实，在1 wt。％的NCC和MPC处获得了最显着的防腐性能。