摘要
基于35%玻璃纤维增强聚(对苯二甲酰己二胺/间苯二甲酰己二胺)(PA6T/6I)高温尼龙复合材料,采用双螺杆挤出机及毛细管流变仪研究了不同添加剂对该复合材料的挤出加工特性及流变流动行为的影响。结果表明,外混铜盐抗氧剂样品的毛细管流变流动曲线与挤出加工改性粒子的流动曲线基本一致;根据铜盐抗氧剂的作用机理,推测添加铜盐抗氧剂的PA6T/6I复合材料挤出时熔体过热的原因是体系形成以铜离子为物理交联点的网络结构,使体系表观黏度升高,受螺杆作用后剪切生热而出现熔体温度骤增的现象。选取氨基酸抗氧剂、受阻胺光稳定剂、褐煤酸钙润滑剂三种典型添加剂,发现外混添加剂后样品的毛细管流变实验结果与相应改性料的挤出加工特性具有明显的相关性;据此,基于毛细管流变仪的外混添加剂样品的流动行为,建立可用于预测玻璃纤维增强PA6T/6I复合材料的挤出加工特性的测试方法。对比不同添加剂的复合材料的短期力学性能,该流变学测试可作为塑料品质管控的补充方法。
Taking poly(p-phenylhexylenediamine/m-phenylhexylenediamine)(PA6T/6I)-based 35% glass fiber reinforced composites as matrix,the influence of additives on the extrusion processing characteristics and rheological flow behavior of composites were studied by twin-screw extruder and capillary viscometer.The results show that flow curves of Cu stabilizer modified pellets and those with externally mixing Cu stabilizer are almost overlapping.According to the interaction mechanism between Cu stabilizer and polymer resin,the overheated melt temperature of PA6T/6I composites with Cu stabilizer during extrusion processing is attributed to the extremely high melt viscosity of the forming physical crosslinking network structure with copper ion acting as crosslinks in the system.Three typical additives,including amino acid antioxidant,blocked amine light stabilizer and calcium lignite lubricant are selected.It is found that the capillary rheological test results of the samples with external additives are significantly correlated with the extrusion processing characteristics of the corresponding modified materials.Based on the flow behavior of the additive sample with capillary rheometer,a test method was established to predict the extrusion processing characteristics of fiber glass reinforced PA6T/6I composites.Comparing with the short-term mechanical properties of composite materials with different additives the rheological test could be used as a supplementary method for plastic quality control.
作者
姜苏俊
叶少勇
杨硕
高栋辉
杨军龙
龙杰明
JIANG Su-jun;YE Shao-yong;YANG Shuo;GAO Dong-hui;YANG Jun-long;LONG Jie-ming(Research and Development Center,Kingfa Science and Technology Co.,Ltd.,Guangzhou 510663,China;Zhuhai Vanteque Specialty Engineering Plastics Co.,Ltd.,Zhuhai 519050,China)
出处
《塑料工业》
CAS
CSCD
北大核心
2020年第11期129-133,158,共6页
China Plastics Industry
基金
珠海市引进创新创业团队项目(ZH0111-0405-170037-P-WC)。
