改性聚乙烯树脂的流变性能研究

Study on Rheological Properties of Modified Polyethylene

预浸料制备工艺上的关键是通过解决熔融树脂的高黏度从而实现增强纤维与树脂间的界面结合能力。文中主要在树脂研究方面,通过添加5种比例的聚丙烯(PP)分别对高密度聚乙烯和线性低密度聚乙烯进行混合改性,并使用挤出机造粒系统进行混合造粒,通过DSC、旋转流变仪、转矩流变仪等测试手段表征各配方树脂的熔融流变特性,从而优选混合树脂配方比例,为制备浸润效果良好的高性能预浸料提供切实可行的树脂选择。结果表明,改性高密度聚乙烯(HDPE)的剪切黏度随着HDPE含量的增加而增加,并且当HDPE:PP的比例为2:8时,剪切黏度、平衡扭矩和机械耗能都最低;而改性线性低密度聚乙烯(LLDPE)的剪切黏度随着LLDPE含量的增加而减小,并且在LLDPE:PP的配方比例为8:2时,混合料的剪切黏度、平衡扭矩和机械耗能也最小。

In order to strengthen the interface combining ability between resign and fiber, the key of technology is to solve the problem of the molten resign of high viscosity and dispersion of the fiber. This paper is mainly in resin research, five kinds of proportion of PP were added to modify the high-density polyethylene and the linear low-density polyethylene respec- tively. The mixture was granulated using an extruder granulation system. DSC, rotational rheometer , torque rheometer and other test methods were used to characterize the melt theological properties of the formulation resin, which is preferred mixed resin ratio formula, thereby enhancing the effect of prepreg infiltration. It was found that the shear viscosity of modified HDPE increased with the increase of HDPE content, and the shear viscosity, equilibrium torque and mechanical energy were the lowest when the ratio of HDPE： PP was 2： 8. The shear viscosity of modified LLDPE decreases with the increase of LLDPE content, and the shear viscosity, balance torque and mechanical energy consumption of LLDPE are the lowest when the ratio of LLDPE： PP is 8： 2.