工艺参数对聚丙烯/聚酰胺6共混物水辅助共注塑管件壁厚及性能的影响

Influence of Processing Parameters on Wall Thickness and Properties of Water⁃assisted Co⁃injection Molding Pipes of Polypropylene/Polyamide 6 Blends

基于自行搭建的水辅助共注塑实验平台,通过正交实验制备了系列水辅助共注塑管件,探究工艺参数对各层壁厚、拉伸性能及各相结晶的影响。结果表明,外层壁厚随着外层熔体温度、注水压力、内层熔体注射压力、模具温度增大而逐渐减小,随着熔体注射切换延迟时间、注水延迟时间增大而逐渐增大;内层壁厚随着注水延迟时间、内层熔体注射压力增大而逐渐增大,随着注水压力、模具温度增大而逐渐减小;管件拉伸强度随着外层熔体温度增大而逐渐减小,随着熔体注射切换延迟时间、注水延迟时间增大而逐渐增大;工艺参数会影响到成型壁厚及冷却进程,进而影响各相结晶度,最终影响管件性能。

Based on the custom⁃designed experimental platform of water⁃assisted co⁃injection molding,a series of injection⁃molded pipes were obtained from an orthogonal experiment.The influence of processing parameters on the wall thick⁃ness,tensile properties and crystallization of each layer of the pipes were investigate.The results indicated that the outer wall thickness of the pipes decreased with an increase in the outer melt temperature,water injection pressure,inner melt injection pressure,and mold temperature but increased with an increases in melt injection delay time and water injection delay time.Their inner wall thickness increased with an increase in water injection delay time and inner melt injection pressure but decreased with an increase in water injection pressure and mold temperature.The pipes also presented a de⁃crease in tensile strength of decreases with an increase in outer melt temperature,and however,their tensile strength in⁃creased with an increase in melt injection delay time and water injection delay time.The processing parameters generated direct influences on the residual wall thickness and the cooling process of the pipes,affecting the crystallinity of each phase and pipe performance accordingly.