溶剂与添加剂对溶剂沉淀法制备PA12粉体的影响

Effects of Solvent and Additive on PA12 Powders Prepared by Solvent Precipitation Method

通过改变溶剂沉淀法中复合溶剂中乙醇的浓度或添加剂(SiO2)的含量制备PA12粉体,并使用激光粒度分析仪、霍尔流速计等对PA12粉体的性能进行了测试与分析。研究发现,乙醇的浓度与添加剂的含量均对PA12粉体的性能存在密切的关联;随乙醇浓度的提高,PA12粉体平均粒径先减后增、粒径分布均匀性提高与流动速率提高、密度降低;随着SiO2含量的增加,PA12粉体的流动速率与粒径分布均匀性提高,平均粒径与密度呈现先减后增的趋势。

PA12 powders were prepared by a solvent precipitation method at different contents of ethanol and additives,and their properties were investigated.The results indicated that the content of ethanol and additives were highly related to the performance of PA12 powders.The average particle size of PA12 powders decreased at first and then tended to increase with an increase in the ethanol concentration.Moreover,the particle size distribution of PA12 powders became more uniform,and their flow rate and density increased and decreased,respectively,as a result of the increase of ethanol concentration.With an increase in the content of SiO2 as an additive,PA12 powders presented an increased flow rate and the uniformity of particle size distribution,and however their average particle size and density decreased at first and then tended to increase.