短切碳纤维增强尼龙66复合材料注塑成型工艺模拟

发布时间：2018-03-19 15:39

  本文选题：碳纤维　切入点：复合材料　出处：《复合材料学报》2017年04期 　论文类型：期刊论文

【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24.3MPa、29.4MPa、35.1MPa;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 behavior and injection molding process of short cut carbon fiber reinforced nylon 66 CFR / PA66 composite particles with different mass fraction were analyzed by capillary rheometer and small mould made by ourselves. The study shows that the melt of short cut CF/PA66 composites belongs to power law fluid, and the viscosity of short cut CF/PA66 composites varies significantly with temperature, pressure and CF mass fraction. When the temperature and pressure rise to the critical value, the rheological characteristics of the melt flow from the pseudoplastic zone to the Newtonian zone. With the increase of CF mass fraction, the suitable molding temperature of CFR / PA66 composites was increased. The optimum molding temperature of CF/PA66 particles with PA66% CF content of 10 wt% and 20 wt% was 278T 285 鈩，

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