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通过毛细管流变仪对高密度聚乙烯(HDPE)/纳米氢氧化镁(MH)/微囊红磷(MRP)无卤复合阻燃体系的流变性进行研究并得出结论:HDPE/MH和HDPE/MH/MRP熔体均为假塑性流体,MH的增加使体系流变性变差,流动指数n减小;红磷的加入对体系剪切应力、黏度及n值影响较小。温度的变化不改变两熔体的假塑性特征,且熔融后升高温度对体系流变性改善意义不大。在HDPE/MH/MRP复合材料的注射成型中,提高背压、注射压力有利于改善加工制品的流痕缺陷,升高模压、模温和延长保压时间,有利于改善制品的表面质量。
The rheology of high density polyethylene (HDPE) / nano-magnesium hydroxide (MH) / microcapsule red phosphorus (MRP) non-halogen composite fire retardant system was studied by capillary rheometer and concluded that HDPE / / MH / MRP melt are all pseudoplastic fluids. The increase of MH makes the rheological properties of the system deteriorate and the flow index n decreases. The addition of red phosphorus has little effect on the shear stress, viscosity and n value of the system. The change of temperature does not change the pseudoplastic characteristics of the two melts, and the increasing temperature after melting has little effect on the rheology of the system. In the HDPE / MH / MRP composite injection molding, to improve the back pressure, injection pressure is conducive to improving the flow defects of processed products, increased molding, mold temperature and prolonged dwell time, help to improve the surface quality of products.