汽车零部件包装用PP/SBN复合材料的性能研究

目的 研究单层氮化硼（Single-layer Boron Nitride, SBN）对聚丙烯（Polypropylene, PP）力学性能和摩擦性能的影响。方法 首先利用超声剥离和硅烷偶联剂KH550表面改性方法制得SBN，用高速混合机将PP、马来酸酐接枝聚丙烯（PP-g-MAH）和SBN混合均匀；然后利用注塑机通过熔融共混，制备PP/SBN复合材料。结果 当SBN质量分数低于1.6%时，PP/SBN的表面硬度和耐磨性能得到了进一步改善；当SBN质量分数高于1.6%时，PP/SBN的力学强度和摩擦性能降低；当SBN质量分数为1.6%时，PP/SBN的拉伸强度和冲击强度分别达到最大值（35.27 MPa, 34.69 kJ/m2），较纯PP分别提高了10.7%, 18.8%。此时，PP/SBN的摩擦因数和磨损率较纯PP分别降低了15.1%, 32.4%。结论 当SBN质量分数为1.6%时，对PP具有增强增韧作用，复合材料的力学性能和耐磨性能都得到明显提高。

Properties of PP/SBN Composites for Automobile Parts Packaging

The work aims to study the effect of single-layer boron nitride (SBN) on the mechanical and friction properties of polypropylene (PP). Firstly, the SBN was prepared by ultrasonic exfoliation and surface modification method with silane coupling agent KH550. The PP, maleic anhydride grafted PP (PP-g-MAH) and SBN were uniformly mixed by a high-speed mixer. Then, an injection-molding machine was used to melt and blend the mixture to prepare PP/SBN composites. The surface hardness and wear resistance of PP/SBN were further improved when the mass fraction of SBN was lower than 1.6%. The mechanical strength and friction performance of PP/SBN were reduced when the mass fraction of SBN was higher than 1.6%. The tensile strength and impact strength of PP/SBN reached their maximum (35.27 MPa, 34.69 kJ/m2) when the mass fraction of SBN was 1.6%, respectively increased by 10.7% and 18.8% compared with pure PP. At this time, the friction coefficient and wear rate of PP/SBN respectively decreased by 15.1% and 32.4% compared with pure PP. The SBN (mass fraction of 1.6%) has enhanced and toughened effect on PP, and the mechanical properties and wear resistance of composites have been improved obviously.