弹头直径对短玻纤增强聚丙烯水驱动弹头辅助共注塑管件的质量影响

doi:10.16085/j.issn.1000-6613.2024-0771

摘要/Abstract

摘要：

针对短玻纤增强聚丙烯为外层、聚丙烯为内层的水驱动弹头辅助共注塑（W-PACIM）管件，通过实验手段探究弹头直径（9~12mm）对管件玻纤取向、残余壁厚大小及均匀性和耐压性能的影响。实验结果表明：外层玻纤在不同层取向度呈现差异，外侧近界面层玻纤沿流动方向取向度高，中间层玻纤取向度次之，近模壁层玻纤分布杂乱无章，大多与流动方向呈锐角或垂直分布；随着弹头直径的增大，靠近模具壁面层玻纤断裂严重，各层玻纤取向度也逐渐变低；随着弹头直径的增大，W-PACIM管件总壁厚与内层壁厚逐渐减小，而外层壁厚小范围下降；W-PACIM管件的耐压性能随着弹头直径的增大逐渐降低。当弹头直径为10mm时，W-PACIM管件综合质量最佳。

关键词: 水驱动弹头辅助共注塑, 弹头直径, 复合材料, 聚合物加工, 壁厚, 流变学

Abstract:

The effect of projectile diameter (9—12mm) on glass fiber orientation, residual wall thickness size and uniformity, and pressure resistance of water-projectile assisted co-injection molded (W-PACIM) fittings with short glass fiber reinforced polypropylene (SGFRP) as the outer layer and polypropylene (PP) as the inner layer was investigated by experimental means. The experimental results showed that the glass fibers in the outer layers presented various orientations in different layers, the glass fibers in the outer near-interface layer were highly oriented along the flow direction, and those in the middle layers were less oriented, while in the near-mold-wall layers, they were haphazardly distributed, mostly at an acute or perpendicular angle with the flow direction. With the increase of projectile diameter, the glass fibers in the near-mold-wall layers were severely fractured, and the orientation of glass fibers in each layer was getting worse. Besides, the total wall thickness of the W-PACIM fittings gradually decreased with the inner wall thickness, while the outer wall thickness decreased in a small range. The pressure resistance of W-PACIM fittings decreased progressively with increasing projectile diameter. The combined quality of the W-PACIM fittings was the best when the projectile diameter was 10mm.

Key words: water projectile assisted co-injection molding, projectile diameter, composites, polymer processing, wall thickness, rheology

中图分类号:

TQ320.66

俸三喆, 匡唐清, 柳和生, 杨帆, 陈灏. 弹头直径对短玻纤增强聚丙烯水驱动弹头辅助共注塑管件的质量影响[J]. 化工进展, 2025, 44(7): 4061-4069.

FENG Sanzhe, KUANG Tangqing, LIU Hesheng, YANG Fan, CHEN Hao. Effect of projectile diameter on the quality of water projectile assisted co-injection molding fittings of short glass fiber reinforced polypropylene[J]. Chemical Industry and Engineering Progress, 2025, 44(7): 4061-4069.

图/表 14

图1 W-PACIM原理[22]

图2 模具结构示意图

表1 成型工艺参数

工艺参数	数值
外层熔体温度/℃	240
内外层熔体切换时间/s	3
内层熔体注射压力/MPa	8
注水延迟时间/s	5
注水压力/MPa	7
模具温度/℃	45
保压时间/s	10

图3 弹头结构示意图

图4 扫描电镜样品制备方法

图5 扫描电镜观测样品

图6 9mm弹头成型制件玻纤取向观测SEM图

图7 10mm弹头成型制件玻纤取向观测SEM图

图8 11mm弹头成型制件玻纤取向观测SEM图

图9 12mm弹头成型制件玻纤取向观测SEM图

图10 弹头直径对W-PACIM管件壁厚影响

图11 弹头直径对W-PACIM管件壁厚标准差的影响

图12 弹头直径对W-PACIM管件耐压性能的影响

图13 耐压测试样品结果

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