摘要
采用注射成型方法制备了密度高达11.214 g/cm3的尼龙6/钨(PA6/W)复合材料,利用扫描电子显微镜观察了复合材料的微观形貌,用转矩流变仪研究了PA6,PA6与W粉的混合热历史过程及转速对混合物平衡转矩的影响。为了提高PA6/W复合材料的流变性,在PA6与W粉的混合过程中加入3种微量增塑剂季戊四醇硬酯酸酯(PETS)、N,N′-乙撑双硬脂酰胺(EBS)、邻苯二甲酸二辛脂(DOP),利用熔体流动速率(MFR)仪研究了增塑剂对PA6/W复合材料MFR的影响。结果表明,W颗粒被PA6基体包裹良好,且分散比较均匀;在温度为230℃、转速为35 r/min条件下,PA6和W粉混合效果理想;3种增塑剂都能明显改善复合材料的流变性,以EBS的改善效果最佳,并且复合材料属于假塑性流体,非牛顿指数n小于1。
PA6 / tungsten composite with high density of 11.214 g / cmJ was prepared by injection moulding. The scanning electron microscope was adopted to observe the composite＇ s microstructure. The heat story of PA6 and the mixture of PA6 and tungsten powders and the influence of rotating speed on balance torque were investigated by the torque rheometer. In order to improve the flow behavior of the composite, plasticizer pentaerythrityl stearate, N, N＇-ethylene bisstearamide and dioctyl phthalate were added in the mix process of PA6 and tungsten powders. Using melt flow rate meter, the effect of plasticizer on melt flow rate of PA6/tungsten composite was investigated. The results show the tungsten powders are all well covered and well-distributed in nylon 6 matrix, and PA6 and tungsten powders were mixed uniformly when the temperature is 230~C and rotate speed is 35 r/min. All these plasticizers can greatly improve the rheology of the composite and the EBS is shown to be the best plasticizer for the processing of PA6/tungsten composite. The calculated non-Newton/an index n value is less than I and the flow ability of the composite obeys the law ofpseudoplastic fluid.
出处
《工程塑料应用》
CAS
CSCD
北大核心
2013年第2期76-80,共5页
Engineering Plastics Application
