Simulation of injection molding process of chopped carbon fiber reinforced nylon 66 composites
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摘要: 采用毛细管流变仪和自制小型模具，对不同质量分数的短切碳纤维增强尼龙66（CF/PA66）复合材料颗粒进行了熔体流动性能分析和注塑成型工艺模拟，实现少量原料快速模拟CF/PA66的注塑成型工艺参数。研究表明：短切CF/PA66复合材料的熔体属于幂律流体，熔体黏度随温度、压力和CF质量分数变化显著，当温度和压力升高到临界值后熔体流变特性从假塑性区进入牛顿区；随着CF质量分数的增加，CF/PA66复合材料适宜成型温度提高。实验中PA66、CF质量分数为10wt%和20wt%的CF/PA66三种颗粒的适宜成型温度分别为278~285℃、280~287℃、290~298℃，通过对熔体进行Bagley压力校正，三种颗粒适宜成型的最小注塑压力分别为24.3 MPa、29.4 MPa、35.1 MPa；将流变仪模拟所得参数应用于注塑成型工艺，所得样品的拉伸强度与流变仪制备的试样非常接近，进一步说明了毛细管流变仪模拟CF/PA66注塑成型过程的可行性和有效性，为其注塑成型工艺条件提供了理论依据。Abstract: The melt flow properties and injection molding process of carbon fiber reinforced nylon 66 (CF/PA66) composites granules with different fiber mass fraction were analyzed and simulated respectively by capillary rheometer and homemade small molds. The parameters of CF/PA66 injection molding process were quickly obtained. The results show that the melt of CF/PA66 composites belongs to the power-law fluid, and the melt viscosity changes significantly with temperature, pressure and the carbon fiber mass fraction, the melt rheological properties change from pseudo-plastic area into Newton area while the temperature and pressure go up to the critical value. With the increase of the carbon fiber mass fraction, the suitable molding temperature of CF/PA66 improves, that of PA66, PA66 with 10wt% and 20wt% CF in our experiments are 278-285℃, 280-287℃ and 290-298℃, respectively. By means of Bagley pressure correction to the melt, the smallest injection pressure of three granules suitable for forming are 24.3 MPa, 29.4 MPa, 35.1 MPa, respectively. These parameters from rheometer simulation are applied to injection molding process, it is found that the tensile strength of samples prepared by rheometer is quite close to the samples by injection molding, which will further prove that the capillary rheometer simulation of CF/PA66 injection molding process is feasible and effective, and provid the theory basis to determine the injection molding.
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Keywords:
- carbon fiber /
- composite /
- nylon /
- injection molding /
- capillary rheometer
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