摘要:微发泡注射成型技术（MIM）是基于常规注射成型技术（CIM）的基础上，添加物理或化学发泡剂，得到拥有疏松芯层与致密表层的制品。与CIM相比，MIM是一个复杂的过程。因此在MIM过程时，确定加工工艺对成品质量十分重要。本实验采用了正交实验法，通过拉伸实验研究了注射时间、保压时间，保压压力和熔体温度对PP/HDPE微发泡注射成型零件的韧性影响。

本次实验表明，采用MIM技术制造PP/HDPE共混聚合物超延展性制件是可行的。此外，本研究还表明了制件的韧性深受加工工艺的影响。变量分析的结果进一步表明，熔体温度对制件韧性影响最大，其次是保压时间，保压压力和注射时间。通过极差分析，得到了MIM工艺最优组合，证明了通过优化工艺参数可以有效的改善制件的韧性。当参数设置的足够合理时，制件的韧性会有明显提高。本次实验还进行了方程分析，排除了误差的的影响，得到了MIM技术制造PP/HDPE共混聚合物时，熔体温度对制件的韧性影响最显著。

关键词：微发泡注射成型；聚丙烯；高密度聚乙烯；AC发泡剂；实验设计；变量分析

Abstract:Microcellular injection molding (MIM) uses conventional injection molding (CIM) with a physical or chemistry foaming agent resulting in products with loose core and dense surface. Compared to CIM, MIM is a much more complicated process. As such, it  is critical to determine the processing conditions for fabricating quality parts using MIM. We used the design of experiment (DOE) method based on the Taguchi method to determine the influence of the melt temperature,injection time,packing time and packing pressure on the ductility of PP/HDPE WFIM parts, which were investigated by tensile testing .

Our research suggests that fabricating PP/HDPE super-ductile parts using WIM is indeed feasible.Our research also indicates that the ductility deeply influenced by the processing conditions.The analysis of variance results shows further that the melt temperature had the greatest influence on the ductility, followed by the packing time, packing pressure,and injection time. By range analysis obtained optimal parameters of maximum tenacity, and find that the tenacity of MIM parts really can be improved by changing the process parameters, and as long as the parameter setting is rational , the tenacity  of  MIM  parts  will  certainly  have  a  great  extent  increase.Finally,  in  order to

exclude the interference of experimental error，we make a significant test through ANOVA.

The conclusion is drawn that the melt temperature has the most significant effect on the tenacity of the parts.

Keywords: Microcellular Injection Molded; PP/HDPE; Azodicarbonamide; Design of experiment (DOE); Analysis of variance (ANOVA)

目 录

第一章绪论 1

1.1聚合物微发泡材料简述 1

1.1.1微发泡成型概述及 1

1.1.2聚丙烯发泡材料 2

1.1.3聚丙烯和高密度聚乙烯聚合物的研究现状与发展 3

1.2聚丙烯发泡方法及化学发泡法机原理 4

1.2.1聚合物发泡原理 4

1.2.2化学发泡法泡孔长大机制 4

1.2.3AC发泡剂概述 5

1.3本文研究的内容与意义 6

第二章实验设计 7

2.1实验主要原料及牌号