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将聚丙烯与1%的滑石粉混合造粒,使用N2作为物理发泡剂,通过自行搭建的非连续超临界N2注气系统,研究发泡注塑工艺过程中注射行程、注射速度、螺杆转速、熔体温度对制品表面质量、减重和泡孔结构的影响。结果表明:注射行程引起的熔体填充量变化是影响制品减重的首要因素,随着填充量的增加,减重下降明显;高压力降速率能够得到均匀泡孔分布且泡孔密度较高的制品;螺杆转速导致停留时间改变对制品表面质量影响较大;熔体温度影响到发泡剂在聚合物熔体中的溶解,螺杆转速130～150 r/min、熔体温度200℃时,能够得到减重、制品表面质量和泡孔结构俱佳的制品。
Using polypropylene powder and 1% talc as raw materials, N2 was used as a physical blowing agent to study the effects of injection stroke, injection speed, screw speed, Effect of melt temperature on product surface quality, weight loss and cell structure. The results show that the change of melt loading caused by injection stroke is the most important factor that affects the weight loss of products. With the increase of filling amount, the weight loss decreases obviously. The high pressure drop rate can obtain uniform cell distribution with high cell density Product; screw speed lead to changes in residence time have a greater impact on the product surface quality; melt temperature affects the foaming agent dissolved in the polymer melt, screw speed 130 ~ 150 r / min, the melt temperature of 200 ℃, can Get weight loss, product surface quality and excellent cell structure of the product.