自润滑微胶囊的制备及LLDPE基复合材料的摩擦性能

Prepared of Self-lubricating Microcapsules and Tribology Performance of LLDPE-based Composites

摘要:

以聚砜为壁材，润滑油为芯材，采用溶剂挥发法制备了自润滑微胶囊，考察了芯壁比对微胶囊芯材含量和壁厚的影响。所制备的微胶囊具有高的热稳定性，初始降解温度为240℃，平均粒径为130 μm，壁厚约5 μm, 芯材含量占微胶囊质量分数的53.25%。将制得的微胶囊添加到线性低密度聚乙烯（LLDPE）基体中，制得LLDPE基自润滑复合材料，对其摩擦磨损性能进行了测定，揭示了自润滑机理。结果表明，当润滑油微胶囊添加量为LLDPE质量分数的20%时，LLDPE基功能化自润滑复合材料的摩擦系数最低，磨损率最小，相较于纯LLDPE分别降低了24.8%和65.3%。

Abstract:

Polysulfone microcapsules containing lubricating oil were successfully prepared using solvent evaporation method. The effect of the mass ratio of lubricating oil and polysulfone on the core content and wall thickness of microcapsules were discussed. The synthesized microcapsules have excellent thermal stability, with a thermal degradation onset temperature of 240℃. The mean diameter and wall thickness were approximately 130 μm and 5 μm, respectively. The encapsulation capacity of about 53.25% was achieved. The self-lubricating composites were prepared by incorporating the microcapsules into LLDPE, and the tribological properties and the self-lubricating mechanism of the composites were studied. When the concentration of the lubricating oil microcapsules was 20%. The frictional coefficient and wear rate of self-lubricating composite were reduced by 24.8% and 65.3%, respectively, as compared to the pure LLDPE.